Merge topic branch 'tracking-armlt-gator-5.10' into integration-linux-ux500

Signed-off-by: Philippe Langlais <philippe.langlais@stericsson.com>

34 files changed, 7571 insertions, 0 deletions

diff --git a/drivers/Kconfig b/drivers/Kconfig
index c66015a8379..82dc759a772 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -144,5 +144,7 @@ source "drivers/devfreq/Kconfig"
 
 source "drivers/modem/Kconfig"
 
+source "drivers/gator/Kconfig"
+
 endmenu
 
diff --git a/drivers/Makefile b/drivers/Makefile
index ccd35da64cd..d638d85a80e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -136,3 +136,5 @@ obj-$(CONFIG_VIRT_DRIVERS)	+= virt/
 obj-$(CONFIG_HYPERV)		+= hv/
 
 obj-$(CONFIG_PM_DEVFREQ)	+= devfreq/
+
+obj-$(CONFIG_GATOR)		+= gator/
diff --git a/drivers/gator/Kconfig b/drivers/gator/Kconfig
new file mode 100644
index 00000000000..14b3d619d18
--- /dev/null
+++ b/drivers/gator/Kconfig
@@ -0,0 +1,33 @@
+config GATOR
+	tristate "Gator module for ARM's Streamline Performance Analyzer"
+	default m
+	depends on PROFILING
+	depends on HIGH_RES_TIMERS
+	depends on LOCAL_TIMERS || !(ARM && SMP)
+	select TRACING
+
+config GATOR_WITH_MALI_SUPPORT
+	bool
+
+choice
+	prompt "Enable Mali GPU support in Gator"
+	depends on GATOR
+	optional
+
+config GATOR_MALI_400MP
+	bool "Mali-400MP"
+	select GATOR_WITH_MALI_SUPPORT
+
+config GATOR_MALI_T6XX
+	bool "Mali-T604 or Mali-T658"
+	select GATOR_WITH_MALI_SUPPORT
+
+endchoice
+
+config GATOR_MALI_PATH
+	string "Path to Mali driver"
+	depends on GATOR_WITH_MALI_SUPPORT
+	default "drivers/gpu/arm/mali400mp"
+	help
+	  The gator code adds this to its include path so it can get the Mali
+	  trace headers with: #include "linux/mali_linux_trace.h"
diff --git a/drivers/gator/LICENSE b/drivers/gator/LICENSE
new file mode 100644
index 00000000000..d159169d105
--- /dev/null
+++ b/drivers/gator/LICENSE
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/drivers/gator/Makefile b/drivers/gator/Makefile
new file mode 100644
index 00000000000..60d858741dd
--- /dev/null
+++ b/drivers/gator/Makefile
@@ -0,0 +1,64 @@
+ifneq ($(KERNELRELEASE),)
+
+# Uncomment the following line to enable kernel stack unwinding within gator, or update gator_backtrace.c
+# EXTRA_CFLAGS +=	-DGATOR_KERNEL_STACK_UNWINDING
+
+obj-$(CONFIG_GATOR) := gator.o
+
+gator-y :=	gator_main.o \
+		gator_events_irq.o \
+		gator_events_sched.o \
+		gator_events_net.o \
+		gator_events_block.o \
+		gator_events_meminfo.o \
+		gator_events_perf_pmu.o
+
+gator-y +=	gator_events_mmaped.o
+
+ifeq ($(CONFIG_GATOR_WITH_MALI_SUPPORT),y)
+
+ifeq ($(CONFIG_GATOR_MALI_T6XX),y)
+gator-y +=	gator_events_mali_t6xx.o
+else
+gator-y +=	gator_events_mali.o
+endif
+
+ccflags-y += -I$(CONFIG_GATOR_MALI_PATH)
+ccflags-$(CONFIG_GATOR_MALI_400MP) += -DMALI_SUPPORT=MALI_400
+ccflags-$(CONFIG_GATOR_MALI_T6XX) += -DMALI_SUPPORT=MALI_T6xx
+endif
+
+gator-$(CONFIG_ARM) +=	gator_events_armv6.o \
+			gator_events_armv7.o \
+			gator_events_l2c-310.o \
+			gator_events_scorpion.o
+
+$(obj)/gator_main.o: $(obj)/gator_events.h
+
+clean-files := gator_events.h
+
+# Note, in the recipe below we use "cd $(srctree) && cd $(src)" rather than
+# "cd $(srctree)/$(src)" because under DKMS  $(src) is an absolute path, and we
+# can't just use $(src) because for normal kernel builds this is relative to
+# $(srctree)
+
+       chk_events.h = :
+ quiet_chk_events.h = echo '  CHK     $@'
+silent_chk_events.h = :
+$(obj)/gator_events.h: FORCE
+	@$($(quiet)chk_events.h)
+	$(Q)cd $(srctree) && cd $(src) ; $(CONFIG_SHELL) gator_events.sh $(abspath $@)
+
+else
+
+all:
+	@echo
+	@echo "usage:"
+	@echo "      make -C <kernel_build_dir> M=\`pwd\` ARCH=arm CROSS_COMPILE=<...> modules"
+	@echo
+	$(error)
+
+clean:
+	rm -f *.o .*.cmd gator_events.h modules.order Module.symvers gator.ko gator.mod.c
+
+endif
diff --git a/drivers/gator/gator.h b/drivers/gator/gator.h
new file mode 100644
index 00000000000..6b961099531
--- /dev/null
+++ b/drivers/gator/gator.h
@@ -0,0 +1,100 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef GATOR_H_
+#define GATOR_H_
+
+#include <linux/version.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/list.h>
+
+#define GATOR_PERF_SUPPORT		LINUX_VERSION_CODE >= KERNEL_VERSION(3, 0, 0)
+#define GATOR_PERF_PMU_SUPPORT  GATOR_PERF_SUPPORT && defined(CONFIG_PERF_EVENTS) && defined(CONFIG_HW_PERF_EVENTS)
+#define GATOR_NO_PERF_SUPPORT   (!(GATOR_PERF_SUPPORT))
+#define GATOR_CPU_FREQ_SUPPORT  (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)) && defined(CONFIG_CPU_FREQ)
+
+// cpu ids
+#define ARM1136		0xb36
+#define ARM1156		0xb56
+#define ARM1176		0xb76
+#define ARM11MPCORE 0xb02
+#define CORTEX_A5	0xc05
+#define CORTEX_A7	0xc07
+#define CORTEX_A8	0xc08
+#define CORTEX_A9	0xc09
+#define CORTEX_A15	0xc0f
+#define SCORPION	0x00f
+#define SCORPIONMP	0x02d
+#define KRAITSIM	0x049
+#define KRAIT       0x04d
+
+/******************************************************************************
+ * Filesystem
+ ******************************************************************************/
+int gatorfs_create_file_perm(struct super_block *sb, struct dentry *root,
+	char const *name, const struct file_operations *fops, int perm);
+
+struct dentry *gatorfs_mkdir(struct super_block *sb,
+	struct dentry *root, char const *name);
+
+int gatorfs_create_ulong(struct super_block *sb, struct dentry *root,
+	char const *name, unsigned long *val);
+
+int gatorfs_create_ro_ulong(struct super_block *sb, struct dentry *root,
+	char const *name, unsigned long *val);
+
+void gator_op_create_files(struct super_block *sb, struct dentry *root);
+
+/******************************************************************************
+ * Tracepoints
+ ******************************************************************************/
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
+#	error Kernels prior to 2.6.32 not supported
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
+#	define GATOR_DEFINE_PROBE(probe_name, proto) \
+		static void probe_##probe_name(PARAMS(proto))
+#	define GATOR_REGISTER_TRACE(probe_name) \
+		register_trace_##probe_name(probe_##probe_name)
+#	define GATOR_UNREGISTER_TRACE(probe_name) \
+		unregister_trace_##probe_name(probe_##probe_name)
+#else
+#	define GATOR_DEFINE_PROBE(probe_name, proto) \
+		static void probe_##probe_name(void *data, PARAMS(proto))
+#	define GATOR_REGISTER_TRACE(probe_name) \
+		register_trace_##probe_name(probe_##probe_name, NULL)
+#	define GATOR_UNREGISTER_TRACE(probe_name) \
+		unregister_trace_##probe_name(probe_##probe_name, NULL)
+#endif
+
+/******************************************************************************
+ * Events
+ ******************************************************************************/
+struct gator_interface {
+	int  (*create_files)(struct super_block *sb, struct dentry *root);
+	int  (*start)(void);
+	void (*stop)(void);
+	int  (*online)(int** buffer);
+	int  (*offline)(int** buffer);
+	void  (*online_dispatch)(int cpu);  // called in process context but may not be running on core 'cpu'
+	void  (*offline_dispatch)(int cpu); // called in process context but may not be running on core 'cpu'
+	int  (*read)(int **buffer);
+	int  (*read64)(long long **buffer);
+	struct list_head list;
+};
+
+// gator_events_init is used as a search term in gator_events.sh
+#define gator_events_init(initfn) \
+	static inline int __gator_events_init_test(void) \
+	{ return initfn(); }
+
+int gator_events_install(struct gator_interface *interface);
+int gator_events_get_key(void);
+extern u32 gator_cpuid(void);
+
+#endif // GATOR_H_
diff --git a/drivers/gator/gator_annotate.c b/drivers/gator/gator_annotate.c
new file mode 100644
index 00000000000..b2288b3ad81
--- /dev/null
+++ b/drivers/gator/gator_annotate.c
@@ -0,0 +1,149 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+#include <asm/current.h>
+#include <linux/spinlock.h>
+
+static DEFINE_SPINLOCK(annotate_lock);
+static bool collect_annotations = false;
+
+static int annotate_copy(struct file *file, char const __user *buf, size_t count)
+{
+	int cpu = 0;
+	int write = per_cpu(gator_buffer_write, cpu)[ANNOTATE_BUF];
+
+	if (file == NULL) {
+		// copy from kernel
+		memcpy(&per_cpu(gator_buffer, cpu)[ANNOTATE_BUF][write], buf, count);
+	} else {
+		// copy from user space
+		if (copy_from_user(&per_cpu(gator_buffer, cpu)[ANNOTATE_BUF][write], buf, count) != 0)
+			return -1;
+	}
+	per_cpu(gator_buffer_write, cpu)[ANNOTATE_BUF] = (write + count) & gator_buffer_mask[ANNOTATE_BUF];
+
+	return 0;
+}
+
+static ssize_t annotate_write(struct file *file, char const __user *buf, size_t count_orig, loff_t *offset)
+{
+	int tid, cpu, header_size, available, contiguous, length1, length2, size, count = count_orig & 0x7fffffff;
+
+	if (*offset)
+		return -EINVAL;
+
+	if (!collect_annotations) {
+		return count_orig;
+	}
+
+	cpu = 0; // Annotation only uses a single per-cpu buffer as the data must be in order to the engine
+
+	if (file == NULL) {
+		tid = -1; // set the thread id to the kernel thread
+	} else {
+		tid = current->pid;
+	}
+
+	// synchronize between cores
+	spin_lock(&annotate_lock);
+
+	// determine total size of the payload
+	header_size = MAXSIZE_PACK32 * 3 + MAXSIZE_PACK64;
+	available = buffer_bytes_available(cpu, ANNOTATE_BUF) - header_size;
+	size = count < available ? count : available;
+
+	if (size <= 0) {
+		size = 0;
+		goto annotate_write_out;
+	}
+
+	// synchronize shared variables annotateBuf and annotatePos
+	if (collect_annotations && per_cpu(gator_buffer, cpu)[ANNOTATE_BUF]) {
+		gator_buffer_write_packed_int(cpu, ANNOTATE_BUF, smp_processor_id());
+		gator_buffer_write_packed_int(cpu, ANNOTATE_BUF, tid);
+		gator_buffer_write_packed_int64(cpu, ANNOTATE_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, ANNOTATE_BUF, size);
+
+		// determine the sizes to capture, length1 + length2 will equal size
+		contiguous = contiguous_space_available(cpu, ANNOTATE_BUF);
+		if (size < contiguous) {
+			length1 = size;
+			length2 = 0;
+		} else {
+			length1 = contiguous;
+			length2 = size - contiguous;
+		}
+
+		if (annotate_copy(file, buf, length1) != 0) {
+			size = -EINVAL;
+			goto annotate_write_out;
+		}
+
+		if (length2 > 0 && annotate_copy(file, &buf[length1], length2) != 0) {
+			size = -EINVAL;
+			goto annotate_write_out;
+		}
+
+		// Check and commit; commit is set to occur once buffer is 3/4 full
+		buffer_check(cpu, ANNOTATE_BUF);
+	}
+
+annotate_write_out:
+	spin_unlock(&annotate_lock);
+
+	// return the number of bytes written
+	return size;
+}
+
+#include "gator_annotate_kernel.c"
+
+static int annotate_release(struct inode *inode, struct file *file)
+{
+	int cpu = 0;
+
+	// synchronize between cores
+	spin_lock(&annotate_lock);
+
+	if (per_cpu(gator_buffer, cpu)[ANNOTATE_BUF] && buffer_check_space(cpu, ANNOTATE_BUF, MAXSIZE_PACK64 + 2 * MAXSIZE_PACK32)) {
+		uint32_t tid = current->pid;
+		gator_buffer_write_packed_int(cpu, ANNOTATE_BUF, tid);
+		gator_buffer_write_packed_int64(cpu, ANNOTATE_BUF, 0); // time
+		gator_buffer_write_packed_int(cpu, ANNOTATE_BUF, 0);   // size
+	}
+
+	spin_unlock(&annotate_lock);
+
+	return 0;
+}
+
+static const struct file_operations annotate_fops = {
+	.write		= annotate_write,
+	.release	= annotate_release
+};
+
+static int gator_annotate_create_files(struct super_block *sb, struct dentry *root)
+{
+	return gatorfs_create_file_perm(sb, root, "annotate", &annotate_fops, 0666);
+}
+
+static int gator_annotate_start(void)
+{
+	collect_annotations = true;
+	return 0;
+}
+
+static void gator_annotate_stop(void)
+{
+	collect_annotations = false;
+}
diff --git a/drivers/gator/gator_annotate_kernel.c b/drivers/gator/gator_annotate_kernel.c
new file mode 100755
index 00000000000..ffab08795b7
--- /dev/null
+++ b/drivers/gator/gator_annotate_kernel.c
@@ -0,0 +1,90 @@
+/**
+ * Copyright (C) ARM Limited 2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+static void kannotate_write(char* ptr, unsigned int size)
+{
+	int retval;
+	int pos = 0;
+	loff_t offset = 0;
+	while (pos < size) {
+		 retval = annotate_write(NULL, &ptr[pos], size - pos, &offset);
+		 if (retval < 0) {
+			 printk(KERN_WARNING "gator: kannotate_write failed with return value %d\n", retval);
+			 return;
+		 }
+		 pos += retval;
+	}
+}
+
+// String annotation
+void gator_annotate(char* string)
+{
+	kannotate_write(string, strlen(string) + 1);
+}
+EXPORT_SYMBOL(gator_annotate);
+
+// String annotation with color
+void gator_annotate_color(int color, char* string)
+{
+	kannotate_write((char*)&color, sizeof(color));
+	kannotate_write(string, strlen(string) + 1);
+}
+EXPORT_SYMBOL(gator_annotate_color);
+
+// Terminate an annotation
+void gator_annotate_end(void)
+{
+	char nul = 0;
+	kannotate_write(&nul, sizeof(nul));
+}
+EXPORT_SYMBOL(gator_annotate_end);
+
+// Image annotation with optional string
+void gator_annotate_visual(char* data, unsigned int length, char* string)
+{
+	long long visual_annotation = 0x011c | (strlen(string) << 16) | ((long long)length << 32);
+	kannotate_write((char*)&visual_annotation, 8);
+	kannotate_write(string, strlen(string));
+	kannotate_write(data, length);
+}
+EXPORT_SYMBOL(gator_annotate_visual);
+
+// Marker annotation
+void gator_annotate_marker(void)
+{
+	int marker_annotation = 0x00021c;
+	kannotate_write((char*)&marker_annotation, 3);
+}
+EXPORT_SYMBOL(gator_annotate_marker);
+
+// Marker annotation with a string
+void gator_annotate_marker_str(char* string)
+{
+	int marker_annotation = 0x021c;
+	kannotate_write((char*)&marker_annotation, 2);
+	kannotate_write(string, strlen(string) + 1);
+}
+EXPORT_SYMBOL(gator_annotate_marker_str);
+
+// Marker annotation with a color
+void gator_annotate_marker_color(int color)
+{
+	long long marker_annotation = (0x021c | ((long long)color << 16)) & 0x0000ffffffffffffLL;
+	kannotate_write((char*)&marker_annotation, 7);
+}
+EXPORT_SYMBOL(gator_annotate_marker_color);
+
+// Marker annotationw ith a string and color
+void gator_annotate_marker_color_str(int color, char* string)
+{
+	long long marker_annotation = 0x021c | ((long long)color << 16);
+	kannotate_write((char*)&marker_annotation, 6);
+	kannotate_write(string, strlen(string) + 1);
+}
+EXPORT_SYMBOL(gator_annotate_marker_color_str);
diff --git a/drivers/gator/gator_backtrace.c b/drivers/gator/gator_backtrace.c
new file mode 100644
index 00000000000..50783d69594
--- /dev/null
+++ b/drivers/gator/gator_backtrace.c
@@ -0,0 +1,114 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+/*
+ * EABI backtrace stores {fp,lr} on the stack.
+ */
+struct frame_tail_eabi {
+	unsigned long fp; // points to prev_lr
+	unsigned long lr;
+};
+
+static void arm_backtrace_eabi(int cpu, int buftype, struct pt_regs * const regs, unsigned int depth)
+{
+#if defined(__arm__)
+	struct frame_tail_eabi *tail;
+	struct frame_tail_eabi *next;
+	struct frame_tail_eabi *ptrtail;
+	struct frame_tail_eabi buftail;
+	unsigned long fp = regs->ARM_fp;
+	unsigned long sp = regs->ARM_sp;
+	unsigned long lr = regs->ARM_lr;
+	int is_user_mode = user_mode(regs);
+
+	if (!is_user_mode) {
+		return;
+	}
+
+	/* entry preamble may not have executed */
+	gator_add_trace(cpu, buftype, lr);
+
+	/* check tail is valid */
+	if (fp == 0 || fp < sp) {
+		return;
+	}
+
+	tail = (struct frame_tail_eabi *)(fp - 4);
+
+	while (depth-- && tail && !((unsigned long) tail & 3)) {
+		/* Also check accessibility of one struct frame_tail beyond */
+		if (!access_ok(VERIFY_READ, tail, sizeof(struct frame_tail_eabi)))
+			return;
+		if (__copy_from_user_inatomic(&buftail, tail, sizeof(struct frame_tail_eabi)))
+			return;
+		ptrtail = &buftail;
+
+		lr = ptrtail[0].lr;
+		gator_add_trace(cpu, buftype, lr);
+
+		/* frame pointers should progress back up the stack, towards higher addresses */
+		next = (struct frame_tail_eabi *)(lr - 4);
+		if (tail >= next || lr == 0) {
+			fp = ptrtail[0].fp;
+			next = (struct frame_tail_eabi *)(fp - 4);
+			/* check tail is valid */
+			if (tail >= next || fp == 0) {
+				return;
+			}
+		}
+
+		tail = next;
+	}
+#endif
+}
+
+#if defined(__arm__)
+static DEFINE_PER_CPU(int, backtrace_buffer);
+static int report_trace(struct stackframe *frame, void *d)
+{
+	struct module *mod;
+	unsigned int *depth = d, addr = frame->pc, cookie = NO_COOKIE, cpu = smp_processor_id();
+
+	if (*depth) {
+		mod = __module_address(addr);
+		if (mod) {
+			cookie = get_cookie(cpu, per_cpu(backtrace_buffer, cpu), current, NULL, mod, true);
+			addr = addr - (unsigned long)mod->module_core;
+		}
+		marshal_backtrace(addr & ~1, cookie);
+		(*depth)--;
+	}
+
+	return *depth == 0;
+}
+#endif
+
+// Uncomment the following line to enable kernel stack unwinding within gator, note it can also be defined from the Makefile
+// #define GATOR_KERNEL_STACK_UNWINDING
+static void kernel_backtrace(int cpu, int buftype, struct pt_regs * const regs)
+{
+#if defined(__arm__)
+#ifdef GATOR_KERNEL_STACK_UNWINDING
+	int depth = gator_backtrace_depth;
+#else
+	int depth = 1;
+#endif
+	struct stackframe frame;
+	if (depth == 0)
+		depth = 1;
+	frame.fp = regs->ARM_fp;
+	frame.sp = regs->ARM_sp;
+	frame.lr = regs->ARM_lr;
+	frame.pc = regs->ARM_pc;
+	per_cpu(backtrace_buffer, cpu) = buftype;
+	walk_stackframe(&frame, report_trace, &depth);
+#else
+	marshal_backtrace(PC_REG & ~1, NO_COOKIE);
+#endif
+}
diff --git a/drivers/gator/gator_cookies.c b/drivers/gator/gator_cookies.c
new file mode 100644
index 00000000000..7b5091696bf
--- /dev/null
+++ b/drivers/gator/gator_cookies.c
@@ -0,0 +1,401 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#define COOKIEMAP_ENTRIES	1024		/* must be power of 2 */
+#define TRANSLATE_SIZE		256
+#define MAX_COLLISIONS		2
+
+static uint32_t *gator_crc32_table;
+static uint32_t translate_buffer_mask;
+
+static DEFINE_PER_CPU(char *, translate_text);
+static DEFINE_PER_CPU(uint32_t, cookie_next_key);
+static DEFINE_PER_CPU(uint64_t *, cookie_keys);
+static DEFINE_PER_CPU(uint32_t *, cookie_values);
+static DEFINE_PER_CPU(int, translate_buffer_read);
+static DEFINE_PER_CPU(int, translate_buffer_write);
+static DEFINE_PER_CPU(unsigned int *, translate_buffer);
+
+static inline uint32_t get_cookie(int cpu, int buftype, struct task_struct *task, struct vm_area_struct *vma, struct module *mod, bool in_interrupt);
+static void wq_cookie_handler(struct work_struct *unused);
+DECLARE_WORK(cookie_work, wq_cookie_handler);
+
+static uint32_t cookiemap_code(uint64_t value64) {
+	uint32_t value = (uint32_t)((value64 >> 32) + value64);
+	uint32_t cookiecode = (value >> 24) & 0xff;
+	cookiecode = cookiecode * 31 + ((value >> 16) & 0xff);
+	cookiecode = cookiecode * 31 + ((value >> 8) & 0xff);
+	cookiecode = cookiecode * 31 + ((value >> 0) & 0xff);
+	cookiecode &= (COOKIEMAP_ENTRIES-1);
+	return cookiecode * MAX_COLLISIONS;
+}
+
+static uint32_t gator_chksum_crc32(char *data)
+{
+   register unsigned long crc;
+   unsigned char *block = data;
+   int i, length = strlen(data);
+
+   crc = 0xFFFFFFFF;
+   for (i = 0; i < length; i++) {
+      crc = ((crc >> 8) & 0x00FFFFFF) ^ gator_crc32_table[(crc ^ *block++) & 0xFF];
+   }
+
+   return (crc ^ 0xFFFFFFFF);
+}
+
+/*
+ * Exists
+ *  Pre:  [0][1][v][3]..[n-1]
+ *  Post: [v][0][1][3]..[n-1]
+ */
+static uint32_t cookiemap_exists(uint64_t key) {
+	unsigned long x, flags, retval = 0;
+	int cpu = smp_processor_id();
+	uint32_t cookiecode = cookiemap_code(key);
+	uint64_t *keys = &(per_cpu(cookie_keys, cpu)[cookiecode]);
+	uint32_t *values = &(per_cpu(cookie_values, cpu)[cookiecode]);
+
+	// Can be called from interrupt handler or from work queue
+	local_irq_save(flags);
+	for (x = 0; x < MAX_COLLISIONS; x++) {
+		if (keys[x] == key) {
+			uint32_t value = values[x];
+			for (; x > 0; x--) {
+				keys[x] = keys[x-1];
+				values[x] = values[x-1];
+			}
+			keys[0] = key;
+			values[0] = value;
+			retval = value;
+			break;
+		}
+	}
+	local_irq_restore(flags);
+
+	return retval;
+}
+
+/*
+ * Add
+ *  Pre:  [0][1][2][3]..[n-1]
+ *  Post: [v][0][1][2]..[n-2]
+ */
+static void cookiemap_add(uint64_t key, uint32_t value) {
+	int cpu = smp_processor_id();
+	int cookiecode = cookiemap_code(key);
+	uint64_t *keys = &(per_cpu(cookie_keys, cpu)[cookiecode]);
+	uint32_t *values = &(per_cpu(cookie_values, cpu)[cookiecode]);
+	int x;
+
+	for (x = MAX_COLLISIONS-1; x > 0; x--) {
+		keys[x] = keys[x-1];
+		values[x] = values[x-1];
+	}
+	keys[0] = key;
+	values[0] = value;
+}
+
+static void translate_buffer_write_int(int cpu, unsigned int x)
+{
+	per_cpu(translate_buffer, cpu)[per_cpu(translate_buffer_write, cpu)++] = x;
+	per_cpu(translate_buffer_write, cpu) &= translate_buffer_mask;
+}
+
+static unsigned int translate_buffer_read_int(int cpu)
+{
+	unsigned int value = per_cpu(translate_buffer, cpu)[per_cpu(translate_buffer_read, cpu)++];
+	per_cpu(translate_buffer_read, cpu) &= translate_buffer_mask;
+	return value;
+}
+
+static void wq_cookie_handler(struct work_struct *unused)
+{
+	struct task_struct *task;
+	struct vm_area_struct *vma;
+	int cpu = smp_processor_id();
+	unsigned int cookie, commit;
+
+	mutex_lock(&start_mutex);
+
+	if (gator_started != 0) {
+		commit = per_cpu(translate_buffer_write, cpu);
+		while (per_cpu(translate_buffer_read, cpu) != commit) {
+			task = (struct task_struct *)translate_buffer_read_int(cpu);
+			vma = (struct vm_area_struct *)translate_buffer_read_int(cpu);
+			cookie = get_cookie(cpu, BACKTRACE_BUF, task, vma, NULL, false);
+		}
+	}
+
+	mutex_unlock(&start_mutex);
+}
+
+// Retrieve full name from proc/pid/cmdline for java processes on Android
+static int translate_app_process(char** text, int cpu, struct task_struct * task, struct vm_area_struct *vma, bool in_interrupt)
+{
+	void *maddr;
+	unsigned int len;
+	unsigned long addr;
+	struct mm_struct *mm;
+	struct page *page = NULL;
+	struct vm_area_struct *page_vma;
+	int bytes, offset, retval = 0, ptr;
+	char * buf = per_cpu(translate_text, cpu);
+
+	// Push work into a work queue if in atomic context as the kernel functions below might sleep
+	// Rely on the in_interrupt variable rather than in_irq() or in_interrupt() kernel functions, as the value of these functions seems
+	//   inconsistent during a context switch between android/linux versions
+	if (in_interrupt) {
+		// Check if already in buffer
+		ptr = per_cpu(translate_buffer_read, cpu);
+		while (ptr != per_cpu(translate_buffer_write, cpu)) {
+			if (per_cpu(translate_buffer, cpu)[ptr] == (int)task)
+				goto out;
+			ptr = (ptr + 2) & translate_buffer_mask;
+		}
+
+		translate_buffer_write_int(cpu, (unsigned int)task);
+		translate_buffer_write_int(cpu, (unsigned int)vma);
+		schedule_work(&cookie_work);
+		goto out;
+	}
+
+	mm = get_task_mm(task);
+	if (!mm)
+		goto out;
+	if (!mm->arg_end)
+		goto outmm;
+	addr = mm->arg_start;
+	len = mm->arg_end - mm->arg_start;
+
+	if (len > TRANSLATE_SIZE)
+		len = TRANSLATE_SIZE;
+
+	down_read(&mm->mmap_sem);
+	while (len) {
+		if (get_user_pages(task, mm, addr, 1, 0, 1, &page, &page_vma) <= 0)
+			goto outsem;
+
+		maddr = kmap(page);
+		offset = addr & (PAGE_SIZE-1);
+		bytes = len;
+		if (bytes > PAGE_SIZE - offset)
+			bytes = PAGE_SIZE - offset;
+
+		copy_from_user_page(page_vma, page, addr, buf, maddr + offset, bytes);
+
+		kunmap(page);	// release page allocated by get_user_pages()
+		page_cache_release(page);
+
+		len -= bytes;
+		buf += bytes;
+		addr += bytes;
+
+		*text = per_cpu(translate_text, cpu);
+		retval = 1;
+	}
+
+	// On app_process startup, /proc/pid/cmdline is initially "zygote" then "<pre-initialized>" but changes after an initial startup period
+	if (strcmp(*text, "zygote") == 0 || strcmp(*text, "<pre-initialized>") == 0)
+		retval = 0;
+
+outsem:
+	up_read(&mm->mmap_sem);
+outmm:
+	mmput(mm);
+out:
+	return retval;
+}
+
+static inline uint32_t get_cookie(int cpu, int buftype, struct task_struct *task, struct vm_area_struct *vma, struct module *mod, bool in_interrupt)
+{
+	unsigned long flags, cookie;
+	struct path *path;
+	uint64_t key;
+	char *text;
+
+	if (mod) {
+		text = mod->name;
+	} else {
+		if (!vma || !vma->vm_file) {
+			return INVALID_COOKIE;
+		}
+		path = &vma->vm_file->f_path;
+		if (!path || !path->dentry) {
+			return INVALID_COOKIE;
+		}
+
+		text = (char*)path->dentry->d_name.name;
+	}
+
+	key = gator_chksum_crc32(text);
+	key = (key << 32) | (uint32_t)task->tgid;
+
+	cookie = cookiemap_exists(key);
+	if (cookie) {
+		return cookie;
+	}
+
+	if (strcmp(text, "app_process") == 0 && !mod) {
+		if (!translate_app_process(&text, cpu, task, vma, in_interrupt))
+			return INVALID_COOKIE;
+	}
+
+	// Can be called from interrupt handler or from work queue or from scheduler trace
+	local_irq_save(flags);
+
+	cookie = INVALID_COOKIE;
+	if (marshal_cookie_header(text)) {
+		cookie = per_cpu(cookie_next_key, cpu) += nr_cpu_ids;
+		cookiemap_add(key, cookie);
+		marshal_cookie(cookie, text);
+	}
+
+	local_irq_restore(flags);
+
+	return cookie;
+}
+
+static int get_exec_cookie(int cpu, int buftype, struct task_struct *task)
+{
+	unsigned long cookie = NO_COOKIE;
+	struct mm_struct *mm = task->mm;
+	struct vm_area_struct *vma;
+
+	// kernel threads have no address space
+	if (!mm)
+		return cookie;
+
+	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		if (!vma->vm_file)
+			continue;
+		if (!(vma->vm_flags & VM_EXECUTABLE))
+			continue;
+		cookie = get_cookie(cpu, buftype, task, vma, NULL, true);
+		break;
+	}
+
+	return cookie;
+}
+
+static unsigned long get_address_cookie(int cpu, int buftype, struct task_struct *task, unsigned long addr, off_t *offset)
+{
+	unsigned long cookie = NO_COOKIE;
+	struct mm_struct *mm = task->mm;
+	struct vm_area_struct *vma;
+
+	if (!mm)
+		return cookie;
+
+	for (vma = find_vma(mm, addr); vma; vma = vma->vm_next) {
+		if (addr < vma->vm_start || addr >= vma->vm_end)
+			continue;
+
+		if (vma->vm_file) {
+			cookie = get_cookie(cpu, buftype, task, vma, NULL, true);
+			*offset = (vma->vm_pgoff << PAGE_SHIFT) + addr - vma->vm_start;
+		} else {
+			/* must be an anonymous map */
+			*offset = addr;
+		}
+
+		break;
+	}
+
+	if (!vma)
+		cookie = INVALID_COOKIE;
+
+	return cookie;
+}
+
+static int cookies_initialize(void)
+{
+	uint32_t crc, poly;
+	int i, j, cpu, size, err = 0;
+
+	int translate_buffer_size = 512; // must be a power of 2
+	translate_buffer_mask = translate_buffer_size / sizeof(per_cpu(translate_buffer, 0)[0]) - 1;
+
+	for_each_present_cpu(cpu) {
+		per_cpu(cookie_next_key, cpu) = nr_cpu_ids + cpu;
+
+		size = COOKIEMAP_ENTRIES * MAX_COLLISIONS * sizeof(uint64_t);
+		per_cpu(cookie_keys, cpu) = (uint64_t*)kmalloc(size, GFP_KERNEL);
+		if (!per_cpu(cookie_keys, cpu)) {
+			err = -ENOMEM;
+			goto cookie_setup_error;
+		}
+		memset(per_cpu(cookie_keys, cpu), 0, size);
+
+		size = COOKIEMAP_ENTRIES * MAX_COLLISIONS * sizeof(uint32_t);
+		per_cpu(cookie_values, cpu) = (uint32_t*)kmalloc(size, GFP_KERNEL);
+		if (!per_cpu(cookie_values, cpu)) {
+			err = -ENOMEM;
+			goto cookie_setup_error;
+		}
+		memset(per_cpu(cookie_values, cpu), 0, size);
+
+		per_cpu(translate_buffer, cpu) = (unsigned int *)kmalloc(translate_buffer_size, GFP_KERNEL);
+		if (!per_cpu(translate_buffer, cpu)) {
+			err = -ENOMEM;
+			goto cookie_setup_error;
+		}
+
+		per_cpu(translate_buffer_write, cpu) = 0;
+		per_cpu(translate_buffer_read, cpu) = 0;
+
+		per_cpu(translate_text, cpu) = (char *)kmalloc(TRANSLATE_SIZE, GFP_KERNEL);
+		if (!per_cpu(translate_text, cpu)) {
+			err = -ENOMEM;
+			goto cookie_setup_error;
+		}
+	}
+
+	// build CRC32 table
+	poly = 0x04c11db7;
+	gator_crc32_table = (uint32_t*)kmalloc(256 * sizeof(uint32_t), GFP_KERNEL);
+	for (i = 0; i < 256; i++) {
+		crc = i;
+		for (j = 8; j > 0; j--) {
+			if (crc & 1) {
+				crc = (crc >> 1) ^ poly;
+			} else {
+				crc >>= 1;
+			}
+		}
+		gator_crc32_table[i] = crc;
+	}
+
+cookie_setup_error:
+	return err;
+}
+
+static void cookies_release(void)
+{
+	int cpu;
+
+	for_each_present_cpu(cpu) {
+		kfree(per_cpu(cookie_keys, cpu));
+		per_cpu(cookie_keys, cpu) = NULL;
+
+		kfree(per_cpu(cookie_values, cpu));
+		per_cpu(cookie_values, cpu) = NULL;
+
+		kfree(per_cpu(translate_buffer, cpu));
+		per_cpu(translate_buffer, cpu) = NULL;
+		per_cpu(translate_buffer_read, cpu) = 0;
+		per_cpu(translate_buffer_write, cpu) = 0;
+
+		kfree(per_cpu(translate_text, cpu));
+		per_cpu(translate_text, cpu) = NULL;
+	}
+
+	kfree(gator_crc32_table);
+	gator_crc32_table = NULL;
+}
diff --git a/drivers/gator/gator_ebs.c b/drivers/gator/gator_ebs.c
new file mode 100644
index 00000000000..1208d69fbfd
--- /dev/null
+++ b/drivers/gator/gator_ebs.c
@@ -0,0 +1,158 @@
+/**
+ * Copyright (C) ARM Limited 2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#if defined(__arm__) && (GATOR_PERF_PMU_SUPPORT)
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/pmu.h>
+
+static DEFINE_MUTEX(perf_mutex);
+
+extern int pmnc_counters;
+extern int ccnt;
+extern unsigned long pmnc_enabled[];
+extern unsigned long pmnc_event[];
+extern unsigned long pmnc_count[];
+extern unsigned long pmnc_key[];
+
+static DEFINE_PER_CPU(struct perf_event *, pevent);
+static DEFINE_PER_CPU(struct perf_event_attr *, pevent_attr);
+static DEFINE_PER_CPU(int, key);
+static DEFINE_PER_CPU(unsigned int, prev_value);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+static void ebs_overflow_handler(struct perf_event *event, int unused, struct perf_sample_data *data, struct pt_regs *regs)
+#else
+static void ebs_overflow_handler(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs)
+#endif
+{
+	int cpu = smp_processor_id();
+
+	if (event != per_cpu(pevent, cpu))
+		return;
+
+	// Output backtrace
+	gator_add_sample(cpu, BACKTRACE_BUF, regs);
+
+	// Collect counters
+	collect_counters();
+}
+
+static void gator_event_sampling_online_dispatch(int cpu)
+{
+	struct perf_event * ev;
+
+	if (!event_based_sampling)
+		return;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+	ev = per_cpu(pevent, cpu) = perf_event_create_kernel_counter(per_cpu(pevent_attr, cpu), cpu, 0, ebs_overflow_handler);
+#else
+	ev = per_cpu(pevent, cpu) = perf_event_create_kernel_counter(per_cpu(pevent_attr, cpu), cpu, 0, ebs_overflow_handler, 0);
+#endif
+
+	if (IS_ERR(ev)) {
+		pr_err("gator: unable to start event-based-sampling");
+		return;
+	}
+
+	if (ev->state != PERF_EVENT_STATE_ACTIVE) {
+		pr_err("gator: unable to start event-based-sampling");
+		perf_event_release_kernel(ev);
+		return;
+	}
+
+	ev->pmu->read(ev);
+	per_cpu(prev_value, cpu) = local64_read(&ev->count);
+}
+
+static void gator_event_sampling_offline_dispatch(int cpu)
+{
+	struct perf_event * pe = NULL;
+
+	mutex_lock(&perf_mutex);
+	if (per_cpu(pevent, cpu)) {
+		pe = per_cpu(pevent, cpu);
+		per_cpu(pevent, cpu) = NULL;
+	}
+	mutex_unlock(&perf_mutex);
+
+	if (pe) {
+		perf_event_release_kernel(pe);
+	}
+}
+
+static int gator_event_sampling_start(void)
+{
+	int cnt, event = 0, count = 0, ebs_key = 0, cpu;
+
+	for_each_present_cpu(cpu) {
+		per_cpu(pevent, cpu) = NULL;
+		per_cpu(pevent_attr, cpu) = NULL;
+	}
+
+	event_based_sampling = false;
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (pmnc_count[cnt] > 0) {
+			event_based_sampling = true;
+			event = pmnc_event[cnt];
+			count = pmnc_count[cnt];
+			ebs_key = pmnc_key[cnt];
+			break;
+		}
+	}
+
+	if (!event_based_sampling)
+		return 0;
+
+	for_each_present_cpu(cpu) {
+		u32 size = sizeof(struct perf_event_attr);
+		per_cpu(pevent_attr, cpu) = kmalloc(size, GFP_KERNEL);
+		if (!per_cpu(pevent_attr, cpu))
+			return -1;
+
+		memset(per_cpu(pevent_attr, cpu), 0, size);
+		per_cpu(pevent_attr, cpu)->type = PERF_TYPE_RAW;
+		per_cpu(pevent_attr, cpu)->size = size;
+		per_cpu(pevent_attr, cpu)->config = event;
+		per_cpu(pevent_attr, cpu)->sample_period = count;
+		per_cpu(pevent_attr, cpu)->pinned = 1;
+
+		// handle special case for ccnt
+		if (cnt == ccnt) {
+			per_cpu(pevent_attr, cpu)->type = PERF_TYPE_HARDWARE;
+			per_cpu(pevent_attr, cpu)->config = PERF_COUNT_HW_CPU_CYCLES;
+		}
+
+		per_cpu(key, cpu) = ebs_key;
+	}
+
+	return 0;
+}
+
+static void gator_event_sampling_stop(void)
+{
+	int cpu;
+
+	for_each_present_cpu(cpu) {
+		if (per_cpu(pevent_attr, cpu)) {
+			kfree(per_cpu(pevent_attr, cpu));
+			per_cpu(pevent_attr, cpu) = NULL;
+		}
+	}
+}
+
+#else
+static void gator_event_sampling_online_dispatch(int cpu) {}
+static void gator_event_sampling_offline_dispatch(int cpu) {}
+static int gator_event_sampling_start(void) {return 0;}
+static void gator_event_sampling_stop(void) {}
+#endif
diff --git a/drivers/gator/gator_events.sh b/drivers/gator/gator_events.sh
new file mode 100755
index 00000000000..5467dd6d17d
--- /dev/null
+++ b/drivers/gator/gator_events.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+EVENTS=`grep gator_events_init *.c | sed 's/.\+gator_events_init(\(.\+\)).\+/\1/'`
+
+(
+	echo /\* This file is auto generated \*/
+	echo
+	for EVENT in $EVENTS; do
+		echo __weak int $EVENT\(void\)\;
+	done
+	echo
+	echo static int \(*gator_events_list[]\)\(void\) = {
+	for EVENT in $EVENTS; do
+		echo \	$EVENT,
+	done
+	echo }\;
+) > $1.tmp
+
+cmp -s $1 $1.tmp && rm $1.tmp || mv $1.tmp $1
diff --git a/drivers/gator/gator_events_armv6.c b/drivers/gator/gator_events_armv6.c
new file mode 100644
index 00000000000..5f989ba4e86
--- /dev/null
+++ b/drivers/gator/gator_events_armv6.c
@@ -0,0 +1,244 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "gator.h"
+
+// gator_events_perf_pmu.c is used if perf is supported
+#if GATOR_NO_PERF_SUPPORT
+
+static const char *pmnc_name;
+
+/*
+ * Per-CPU PMCR
+ */
+#define PMCR_E			(1 << 0)	/* Enable */
+#define PMCR_P			(1 << 1)	/* Count reset */
+#define PMCR_C			(1 << 2)	/* Cycle counter reset */
+#define PMCR_OFL_PMN0	(1 << 8)	/* Count reg 0 overflow */
+#define PMCR_OFL_PMN1	(1 << 9)	/* Count reg 1 overflow */
+#define PMCR_OFL_CCNT	(1 << 10)	/* Cycle counter overflow */
+
+#define PMN0 0
+#define PMN1 1
+#define CCNT 2
+#define CNTMAX	(CCNT+1)
+
+static int pmnc_counters = 0;
+static unsigned long pmnc_enabled[CNTMAX];
+static unsigned long pmnc_event[CNTMAX];
+static unsigned long pmnc_key[CNTMAX];
+
+static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt);
+
+static inline void armv6_pmnc_write(u32 val)
+{
+	/* upper 4bits and 7, 11 are write-as-0 */
+	val &= 0x0ffff77f;
+	asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r" (val));
+}
+
+static inline u32 armv6_pmnc_read(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r" (val));
+	return val;
+}
+
+static void armv6_pmnc_reset_counter(unsigned int cnt)
+{
+	u32 val = 0;
+	switch (cnt) {
+	case CCNT:
+		asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r" (val));
+		break;
+	case PMN0:
+		asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r" (val));
+		break;
+	case PMN1:
+		asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r" (val));
+		break;
+	}
+}
+
+int gator_events_armv6_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	int i;
+
+	pmnc_counters = 3;
+
+	for (i = PMN0; i <= CCNT; i++) {
+		char buf[40];
+		if (i == CCNT) {
+			snprintf(buf, sizeof buf, "ARM_%s_ccnt", pmnc_name);
+		} else {
+			snprintf(buf, sizeof buf, "ARM_%s_cnt%d", pmnc_name, i);
+		}
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (!dir) {
+			return -1;
+		}
+		gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
+		gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);
+		if (i != CCNT) {
+			gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int gator_events_armv6_online(int** buffer)
+{
+	unsigned int cnt, len = 0, cpu = smp_processor_id();
+	u32 pmnc;
+
+	if (armv6_pmnc_read() & PMCR_E) {
+		armv6_pmnc_write(armv6_pmnc_read() & ~PMCR_E);
+	}
+
+	/* initialize PMNC, reset overflow, D bit, C bit and P bit. */
+	armv6_pmnc_write(PMCR_OFL_PMN0 | PMCR_OFL_PMN1 | PMCR_OFL_CCNT |
+			PMCR_C | PMCR_P);
+
+	/* configure control register */
+	for (pmnc = 0, cnt = PMN0; cnt <= CCNT; cnt++) {
+		unsigned long event;
+
+		if (!pmnc_enabled[cnt])
+			continue;
+
+		event = pmnc_event[cnt] & 255;
+
+		// Set event (if destined for PMNx counters)
+		if (cnt == PMN0) {
+			pmnc |= event << 20;
+		} else if (cnt == PMN1) {
+			pmnc |= event << 12;
+		}
+
+		// Reset counter
+		armv6_pmnc_reset_counter(cnt);
+	}
+	armv6_pmnc_write(pmnc | PMCR_E);
+
+	// return zero values, no need to read as the counters were just reset
+	for (cnt = PMN0; cnt <= CCNT; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = 0;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static int gator_events_armv6_offline(int** buffer)
+{
+	unsigned int cnt;
+
+	armv6_pmnc_write(armv6_pmnc_read() & ~PMCR_E);
+	for (cnt = PMN0; cnt <= CCNT; cnt++) {
+		armv6_pmnc_reset_counter(cnt);
+	}
+
+	return 0;
+}
+
+static void gator_events_armv6_stop(void)
+{
+	unsigned int cnt;
+
+	for (cnt = PMN0; cnt <= CCNT; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+	}
+}
+
+static int gator_events_armv6_read(int **buffer)
+{
+	int cnt, len = 0;
+	int cpu = smp_processor_id();
+
+	// a context switch may occur before the online hotplug event, thus need to check that the pmu is enabled
+	if (!(armv6_pmnc_read() & PMCR_E)) {
+		return 0;
+	}
+
+	for (cnt = PMN0; cnt <= CCNT; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			u32 value = 0;
+			switch (cnt) {
+			case CCNT:
+				asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r" (value));
+				break;
+			case PMN0:
+				asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r" (value));
+				break;
+			case PMN1:
+				asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r" (value));
+				break;
+			}
+			armv6_pmnc_reset_counter(cnt);
+
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = value;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_armv6_interface = {
+	.create_files = gator_events_armv6_create_files,
+	.stop = gator_events_armv6_stop,
+	.online = gator_events_armv6_online,
+	.offline = gator_events_armv6_offline,
+	.read = gator_events_armv6_read,
+};
+
+int gator_events_armv6_init(void)
+{
+	unsigned int cnt;
+
+	switch (gator_cpuid()) {
+	case ARM1136:
+	case ARM1156:
+	case ARM1176:
+		pmnc_name = "ARM11";
+		break;
+	case ARM11MPCORE:
+		pmnc_name = "ARM11MPCore";
+		break;
+	default:
+		return -1;
+	}
+
+	for (cnt = PMN0; cnt <= CCNT; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+		pmnc_key[cnt] = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_armv6_interface);
+}
+
+gator_events_init(gator_events_armv6_init);
+
+#else
+int gator_events_armv6_init(void)
+{
+	return -1;
+}
+#endif
diff --git a/drivers/gator/gator_events_armv7.c b/drivers/gator/gator_events_armv7.c
new file mode 100644
index 00000000000..590421d110c
--- /dev/null
+++ b/drivers/gator/gator_events_armv7.c
@@ -0,0 +1,319 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*  Disabling interrupts
+ *    Many of the functions below disable interrupts via local_irq_save(). This disabling of interrupts is done to prevent any race conditions
+ *    between multiple entities (e.g. hrtimer interrupts and event based interrupts) calling the same functions. As accessing the pmu involves
+ *    several steps (disable, select, read, enable), these steps must be performed atomically. Normal synchronization routines cannot be used
+ *    as these functions are being called from interrupt context.
+ */
+
+#include "gator.h"
+
+// gator_events_perf_pmu.c is used if perf is supported
+#if GATOR_NO_PERF_SUPPORT
+
+// Per-CPU PMNC: config reg
+#define PMNC_E		(1 << 0)	/* Enable all counters */
+#define PMNC_P		(1 << 1)	/* Reset all counters */
+#define PMNC_C		(1 << 2)	/* Cycle counter reset */
+#define	PMNC_MASK	0x3f		/* Mask for writable bits */
+
+// ccnt reg
+#define CCNT_REG	(1 << 31)
+
+#define CCNT 		0
+#define CNT0		1
+#define CNTMAX 		(6+1)
+
+static const char *pmnc_name;
+static int pmnc_counters;
+
+static unsigned long pmnc_enabled[CNTMAX];
+static unsigned long pmnc_event[CNTMAX];
+static unsigned long pmnc_key[CNTMAX];
+
+static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt);
+
+inline void armv7_pmnc_write(u32 val)
+{
+	val &= PMNC_MASK;
+	asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r" (val));
+}
+
+inline u32 armv7_pmnc_read(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
+	return val;
+}
+
+inline u32 armv7_ccnt_read(u32 reset_value)
+{
+	unsigned long flags;
+	u32 newval = -reset_value;
+	u32 den = CCNT_REG;
+	u32 val;
+
+	local_irq_save(flags);
+	asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den));	// disable
+	asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));	// read
+	asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (newval));// new value
+	asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den));	// enable
+	local_irq_restore(flags);
+
+	return val;
+}
+
+inline u32 armv7_cntn_read(unsigned int cnt, u32 reset_value)
+{
+	unsigned long flags;
+	u32 newval = -reset_value;
+	u32 sel = (cnt - CNT0);
+	u32 den = 1 << sel;
+	u32 oldval;
+
+	local_irq_save(flags);
+	asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den));	// disable
+	asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (sel));	// select
+	asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (oldval));	// read
+    asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (newval));// new value
+	asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den));	// enable
+	local_irq_restore(flags);
+
+	return oldval;
+}
+
+static inline void armv7_pmnc_disable_interrupt(unsigned int cnt)
+{
+	u32 val = cnt ? (1 << (cnt - CNT0)) : (1 << 31);
+	asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val));
+}
+
+inline u32 armv7_pmnc_reset_interrupt(void)
+{
+	// Get and reset overflow status flags
+	u32 flags;
+	asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (flags));
+	flags &= 0x8000003f;
+	asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (flags));
+	return flags;
+}
+
+static inline u32 armv7_pmnc_enable_counter(unsigned int cnt)
+{
+	u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG;
+	asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));
+	return cnt;
+}
+
+static inline u32 armv7_pmnc_disable_counter(unsigned int cnt)
+{
+	u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG;
+	asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));
+	return cnt;
+}
+
+static inline int armv7_pmnc_select_counter(unsigned int cnt)
+{
+	u32 val = (cnt - CNT0);
+	asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));
+	return cnt;
+}
+
+static inline void armv7_pmnc_write_evtsel(unsigned int cnt, u32 val)
+{
+	if (armv7_pmnc_select_counter(cnt) == cnt) {
+		asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
+	}
+}
+
+static int gator_events_armv7_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	int i;
+
+	for (i = 0; i < pmnc_counters; i++) {
+		char buf[40];
+		if (i == 0) {
+			snprintf(buf, sizeof buf, "ARM_%s_ccnt", pmnc_name);
+		} else {
+			snprintf(buf, sizeof buf, "ARM_%s_cnt%d", pmnc_name, i-1);
+		}
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (!dir) {
+			return -1;
+		}
+		gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
+		gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);
+		if (i > 0) {
+			gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int gator_events_armv7_online(int** buffer)
+{
+	unsigned int cnt, len = 0, cpu = smp_processor_id();
+
+	if (armv7_pmnc_read() & PMNC_E) {
+		armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
+	}
+
+	// Initialize & Reset PMNC: C bit and P bit
+	armv7_pmnc_write(PMNC_P | PMNC_C);
+
+	// Reset overflow flags
+	armv7_pmnc_reset_interrupt();
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		unsigned long event;
+
+		if (!pmnc_enabled[cnt])
+			continue;
+
+		// Disable counter
+		armv7_pmnc_disable_counter(cnt);
+
+		event = pmnc_event[cnt] & 255;
+
+		// Set event (if destined for PMNx counters), we don't need to set the event if it's a cycle count
+		if (cnt != CCNT)
+			armv7_pmnc_write_evtsel(cnt, event);
+
+		armv7_pmnc_disable_interrupt(cnt);
+
+		// Reset counter
+		cnt ? armv7_cntn_read(cnt, 0) : armv7_ccnt_read(0);
+
+		// Enable counter
+		armv7_pmnc_enable_counter(cnt);
+	}
+
+	// enable
+	armv7_pmnc_write(armv7_pmnc_read() | PMNC_E);
+
+	// return zero values, no need to read as the counters were just reset
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = 0;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static int gator_events_armv7_offline(int** buffer)
+{
+	// disbale all counters, including PMCCNTR; overflow IRQs will not be signaled
+	armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
+	
+	return 0;
+}
+
+static void gator_events_armv7_stop(void)
+{
+	unsigned int cnt;
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+	}
+}
+
+static int gator_events_armv7_read(int **buffer)
+{
+	int cnt, len = 0;
+	int cpu = smp_processor_id();
+
+	// a context switch may occur before the online hotplug event, thus need to check that the pmu is enabled
+	if (!(armv7_pmnc_read() & PMNC_E)) {
+		return 0;
+	}
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			int value;
+			if (cnt == CCNT) {
+				value = armv7_ccnt_read(0);
+			} else {
+				value = armv7_cntn_read(cnt, 0);
+			}
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = value;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_armv7_interface = {
+	.create_files = gator_events_armv7_create_files,
+	.stop = gator_events_armv7_stop,
+	.online = gator_events_armv7_online,
+	.offline = gator_events_armv7_offline,
+	.read = gator_events_armv7_read,
+};
+
+int gator_events_armv7_init(void)
+{
+	unsigned int cnt;
+
+	switch (gator_cpuid()) {
+	case CORTEX_A5:
+		pmnc_name = "Cortex-A5";
+		pmnc_counters = 2;
+		break;
+	case CORTEX_A7:
+		pmnc_name = "Cortex-A7";
+		pmnc_counters = 4;
+		break;
+	case CORTEX_A8:
+		pmnc_name = "Cortex-A8";
+		pmnc_counters = 4;
+		break;
+	case CORTEX_A9:
+		pmnc_name = "Cortex-A9";
+		pmnc_counters = 6;
+		break;
+	case CORTEX_A15:
+		pmnc_name = "Cortex-A15";
+		pmnc_counters = 6;
+		break;
+	default:
+		return -1;
+	}
+
+	pmnc_counters++; // CNT[n] + CCNT
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+		pmnc_key[cnt] = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_armv7_interface);
+}
+
+gator_events_init(gator_events_armv7_init);
+
+#else
+int gator_events_armv7_init(void)
+{
+	return -1;
+}
+#endif
diff --git a/drivers/gator/gator_events_block.c b/drivers/gator/gator_events_block.c
new file mode 100644
index 00000000000..a8b811413f3
--- /dev/null
+++ b/drivers/gator/gator_events_block.c
@@ -0,0 +1,175 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include "gator.h"
+#include <trace/events/block.h>
+
+#define BLOCK_RQ_WR		0
+#define BLOCK_RQ_RD		1
+
+#define BLOCK_TOTAL		(BLOCK_RQ_RD+1)
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+#define EVENTWRITE REQ_RW
+#else
+#define EVENTWRITE REQ_WRITE
+#endif
+
+static ulong block_rq_wr_enabled;
+static ulong block_rq_rd_enabled;
+static ulong block_rq_wr_key;
+static ulong block_rq_rd_key;
+static DEFINE_PER_CPU(int[BLOCK_TOTAL], blockCnt);
+static DEFINE_PER_CPU(int[BLOCK_TOTAL * 4], blockGet);
+static DEFINE_PER_CPU(bool, new_data_avail);
+
+GATOR_DEFINE_PROBE(block_rq_complete, TP_PROTO(struct request_queue *q, struct request *rq))
+{
+	unsigned long flags;
+	int write, size;
+	int cpu = smp_processor_id();
+
+	if (!rq)
+		return;
+
+	write = rq->cmd_flags & EVENTWRITE;
+	size = rq->resid_len;
+
+	if (!size)
+		return;
+
+	// disable interrupts to synchronize with gator_events_block_read()
+	// spinlocks not needed since percpu buffers are used
+	local_irq_save(flags);
+	if (write)
+		per_cpu(blockCnt, cpu)[BLOCK_RQ_WR] += size;
+	else
+		per_cpu(blockCnt, cpu)[BLOCK_RQ_RD] += size;
+	local_irq_restore(flags);
+
+	per_cpu(new_data_avail, cpu) = true;
+}
+
+static int gator_events_block_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+
+	/* block_complete_wr */
+	dir = gatorfs_mkdir(sb, root, "Linux_block_rq_wr");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &block_rq_wr_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &block_rq_wr_key);
+
+	/* block_complete_rd */
+	dir = gatorfs_mkdir(sb, root, "Linux_block_rq_rd");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &block_rq_rd_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &block_rq_rd_key);
+
+	return 0;
+}
+
+static int gator_events_block_start(void)
+{
+	int cpu;
+
+	for_each_present_cpu(cpu) 
+		per_cpu(new_data_avail, cpu) = true;
+
+	// register tracepoints
+	if (block_rq_wr_enabled || block_rq_rd_enabled)
+		if (GATOR_REGISTER_TRACE(block_rq_complete))
+			goto fail_block_rq_exit;
+	pr_debug("gator: registered block event tracepoints\n");
+
+	return 0;
+
+	// unregister tracepoints on error
+fail_block_rq_exit:
+	pr_err("gator: block event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
+
+	return -1;
+}
+
+static void gator_events_block_stop(void)
+{
+	if (block_rq_wr_enabled || block_rq_rd_enabled)
+		GATOR_UNREGISTER_TRACE(block_rq_complete);
+	pr_debug("gator: unregistered block event tracepoints\n");
+
+	block_rq_wr_enabled = 0;
+	block_rq_rd_enabled = 0;
+}
+
+static int gator_events_block_read(int **buffer)
+{
+	unsigned long flags;
+	int len, value, cpu, data = 0;
+	cpu = smp_processor_id();
+
+	if (per_cpu(new_data_avail, cpu) == false)
+		return 0;
+
+	per_cpu(new_data_avail, cpu) = false;
+
+	len = 0;
+	if (block_rq_wr_enabled) {
+		local_irq_save(flags);
+		value = per_cpu(blockCnt, cpu)[BLOCK_RQ_WR];
+		per_cpu(blockCnt, cpu)[BLOCK_RQ_WR] = 0;
+		local_irq_restore(flags);
+		per_cpu(blockGet, cpu)[len++] = block_rq_wr_key;
+		per_cpu(blockGet, cpu)[len++] = 0; // indicates to Streamline that value bytes were written now, not since the last message
+		per_cpu(blockGet, cpu)[len++] = block_rq_wr_key;
+		per_cpu(blockGet, cpu)[len++] = value;
+		data += value;
+	}
+	if (block_rq_rd_enabled) {
+		local_irq_save(flags);
+		value = per_cpu(blockCnt, cpu)[BLOCK_RQ_RD];
+		per_cpu(blockCnt, cpu)[BLOCK_RQ_RD] = 0;
+		local_irq_restore(flags);
+		per_cpu(blockGet, cpu)[len++] = block_rq_rd_key;
+		per_cpu(blockGet, cpu)[len++] = 0; // indicates to Streamline that value bytes were read now, not since the last message
+		per_cpu(blockGet, cpu)[len++] = block_rq_rd_key;
+		per_cpu(blockGet, cpu)[len++] = value;
+		data += value;
+	}
+
+	if (data != 0)
+		per_cpu(new_data_avail, cpu) = true;
+
+	if (buffer)
+		*buffer = per_cpu(blockGet, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_block_interface = {
+	.create_files = gator_events_block_create_files,
+	.start = gator_events_block_start,
+	.stop = gator_events_block_stop,
+	.read = gator_events_block_read,
+};
+
+int gator_events_block_init(void)
+{
+	block_rq_wr_enabled = 0;
+	block_rq_rd_enabled = 0;
+
+	block_rq_wr_key = gator_events_get_key();
+	block_rq_rd_key = gator_events_get_key();
+
+	return gator_events_install(&gator_events_block_interface);
+}
+gator_events_init(gator_events_block_init);
diff --git a/drivers/gator/gator_events_irq.c b/drivers/gator/gator_events_irq.c
new file mode 100644
index 00000000000..435bc86fb5d
--- /dev/null
+++ b/drivers/gator/gator_events_irq.c
@@ -0,0 +1,188 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include "gator.h"
+#include <trace/events/irq.h>
+
+#define HARDIRQ		0
+#define SOFTIRQ		1
+#define TOTALIRQ	(SOFTIRQ+1)
+
+static ulong hardirq_enabled;
+static ulong softirq_enabled;
+static ulong hardirq_key;
+static ulong softirq_key;
+static DEFINE_PER_CPU(int[TOTALIRQ], irqCnt);
+static DEFINE_PER_CPU(int[TOTALIRQ * 2], irqGet);
+
+GATOR_DEFINE_PROBE(irq_handler_exit, TP_PROTO(int irq,
+		struct irqaction *action, int ret))
+{
+	unsigned long flags;
+
+	// disable interrupts to synchronize with gator_events_irq_read()
+	// spinlocks not needed since percpu buffers are used
+	local_irq_save(flags);
+	per_cpu(irqCnt, smp_processor_id())[HARDIRQ]++;
+	local_irq_restore(flags);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)
+GATOR_DEFINE_PROBE(softirq_exit, TP_PROTO(struct softirq_action *h, struct softirq_action *vec))
+#else
+GATOR_DEFINE_PROBE(softirq_exit, TP_PROTO(unsigned int vec_nr))
+#endif
+{
+	unsigned long flags;
+
+	// disable interrupts to synchronize with gator_events_irq_read()
+	// spinlocks not needed since percpu buffers are used
+	local_irq_save(flags);
+	per_cpu(irqCnt, smp_processor_id())[SOFTIRQ]++;
+	local_irq_restore(flags);
+}
+
+static int gator_events_irq_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+
+	/* irq */
+	dir = gatorfs_mkdir(sb, root, "Linux_irq_irq");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &hardirq_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &hardirq_key);
+
+	/* soft irq */
+	dir = gatorfs_mkdir(sb, root, "Linux_irq_softirq");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &softirq_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &softirq_key);
+
+	return 0;
+}
+
+static int gator_events_irq_online(int** buffer)
+{
+	int len = 0, cpu = smp_processor_id();
+	unsigned long flags; // not necessary as we are in interrupt context anyway, but doesn't hurt
+
+	// synchronization with the irq_exit functions is not necessary as the values are being reset
+	if (hardirq_enabled) {
+		local_irq_save(flags);
+		per_cpu(irqCnt, cpu)[HARDIRQ] = 0;
+		local_irq_restore(flags);
+		per_cpu(irqGet, cpu)[len++] = hardirq_key;
+		per_cpu(irqGet, cpu)[len++] = 0;
+	}
+
+	if (softirq_enabled) {
+		local_irq_save(flags);
+		per_cpu(irqCnt, cpu)[SOFTIRQ] = 0;
+		local_irq_restore(flags);
+		per_cpu(irqGet, cpu)[len++] = softirq_key;
+		per_cpu(irqGet, cpu)[len++] = 0;
+	}
+
+	if (buffer)
+		*buffer = per_cpu(irqGet, cpu);
+
+	return len;
+}
+
+static int gator_events_irq_start(void)
+{
+	// register tracepoints
+	if (hardirq_enabled)
+		if (GATOR_REGISTER_TRACE(irq_handler_exit))
+			goto fail_hardirq_exit;
+	if (softirq_enabled)
+		if (GATOR_REGISTER_TRACE(softirq_exit))
+			goto fail_softirq_exit;
+	pr_debug("gator: registered irq tracepoints\n");
+
+	return 0;
+
+	// unregister tracepoints on error
+fail_softirq_exit:
+	if (hardirq_enabled)
+		GATOR_UNREGISTER_TRACE(irq_handler_exit);
+fail_hardirq_exit:
+	pr_err("gator: irq tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
+
+	return -1;
+}
+
+static void gator_events_irq_stop(void)
+{
+	if (hardirq_enabled)
+		GATOR_UNREGISTER_TRACE(irq_handler_exit);
+	if (softirq_enabled)
+		GATOR_UNREGISTER_TRACE(softirq_exit);
+	pr_debug("gator: unregistered irq tracepoints\n");
+
+	hardirq_enabled = 0;
+	softirq_enabled = 0;
+}
+
+static int gator_events_irq_read(int **buffer)
+{
+	unsigned long flags; // not necessary as we are in interrupt context anyway, but doesn't hurt
+	int len, value;
+	int cpu = smp_processor_id();
+
+	len = 0;
+	if (hardirq_enabled) {
+		local_irq_save(flags);
+		value = per_cpu(irqCnt, cpu)[HARDIRQ];
+		per_cpu(irqCnt, cpu)[HARDIRQ] = 0;
+		local_irq_restore(flags);
+
+		per_cpu(irqGet, cpu)[len++] = hardirq_key;
+		per_cpu(irqGet, cpu)[len++] = value;
+	}
+
+	if (softirq_enabled) {
+		local_irq_save(flags);
+		value = per_cpu(irqCnt, cpu)[SOFTIRQ];
+		per_cpu(irqCnt, cpu)[SOFTIRQ] = 0;
+		local_irq_restore(flags);
+
+		per_cpu(irqGet, cpu)[len++] = softirq_key;
+		per_cpu(irqGet, cpu)[len++] = value;
+	}
+
+	if (buffer)
+		*buffer = per_cpu(irqGet, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_irq_interface = {
+	.create_files = gator_events_irq_create_files,
+	.online = gator_events_irq_online,
+	.start = gator_events_irq_start,
+	.stop = gator_events_irq_stop,
+	.read = gator_events_irq_read,
+};
+
+int gator_events_irq_init(void)
+{
+	hardirq_key = gator_events_get_key();
+	softirq_key = gator_events_get_key();
+
+	hardirq_enabled = 0;
+	softirq_enabled = 0;
+
+	return gator_events_install(&gator_events_irq_interface);
+}
+gator_events_init(gator_events_irq_init);
diff --git a/drivers/gator/gator_events_l2c-310.c b/drivers/gator/gator_events_l2c-310.c
new file mode 100644
index 00000000000..bd1c48a64e2
--- /dev/null
+++ b/drivers/gator/gator_events_l2c-310.c
@@ -0,0 +1,179 @@
+/**
+ * l2c310 (L2 Cache Controller) event counters for gator
+ *
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <asm/hardware/cache-l2x0.h>
+
+#include "gator.h"
+
+#define L2C310_COUNTERS_NUM 2
+
+static struct {
+	unsigned long enabled;
+	unsigned long event;
+	unsigned long key;
+} l2c310_counters[L2C310_COUNTERS_NUM];
+
+static int l2c310_buffer[L2C310_COUNTERS_NUM * 2];
+
+static void __iomem *l2c310_base;
+
+
+
+static void gator_events_l2c310_reset_counters(void)
+{
+	u32 val = readl(l2c310_base + L2X0_EVENT_CNT_CTRL);
+
+	val |= ((1 << L2C310_COUNTERS_NUM) - 1) << 1;
+
+	writel(val, l2c310_base + L2X0_EVENT_CNT_CTRL);
+}
+
+
+static int gator_events_l2c310_create_files(struct super_block *sb,
+		struct dentry *root)
+{
+	int i;
+
+	for (i = 0; i < L2C310_COUNTERS_NUM; i++) {
+		char buf[16];
+		struct dentry *dir;
+
+		snprintf(buf, sizeof(buf), "L2C-310_cnt%d", i);
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (WARN_ON(!dir))
+			return -1;
+		gatorfs_create_ulong(sb, dir, "enabled",
+				&l2c310_counters[i].enabled);
+		gatorfs_create_ulong(sb, dir, "event",
+				&l2c310_counters[i].event);
+		gatorfs_create_ro_ulong(sb, dir, "key",
+				&l2c310_counters[i].key);
+	}
+
+	return 0;
+}
+
+static int gator_events_l2c310_start(void)
+{
+	static const unsigned long l2x0_event_cntx_cfg[L2C310_COUNTERS_NUM] = {
+		L2X0_EVENT_CNT0_CFG,
+		L2X0_EVENT_CNT1_CFG,
+	};
+	int i;
+
+	/* Counter event sources */
+	for (i = 0; i < L2C310_COUNTERS_NUM; i++)
+		writel((l2c310_counters[i].event & 0xf) << 2,
+				l2c310_base + l2x0_event_cntx_cfg[i]);
+
+	gator_events_l2c310_reset_counters();
+
+	/* Event counter enable */
+	writel(1, l2c310_base + L2X0_EVENT_CNT_CTRL);
+
+	return 0;
+}
+
+static void gator_events_l2c310_stop(void)
+{
+	/* Event counter disable */
+	writel(0, l2c310_base + L2X0_EVENT_CNT_CTRL);
+}
+
+static int gator_events_l2c310_read(int **buffer)
+{
+	static const unsigned long l2x0_event_cntx_val[L2C310_COUNTERS_NUM] = {
+		L2X0_EVENT_CNT0_VAL,
+		L2X0_EVENT_CNT1_VAL,
+	};
+	int i;
+	int len = 0;
+
+	if (smp_processor_id())
+		return 0;
+
+	for (i = 0; i < L2C310_COUNTERS_NUM; i++) {
+		if (l2c310_counters[i].enabled) {
+			l2c310_buffer[len++] = l2c310_counters[i].key;
+			l2c310_buffer[len++] = readl(l2c310_base +
+					l2x0_event_cntx_val[i]);
+		}
+	}
+	
+	/* l2c310 counters are saturating, not wrapping in case of overflow */
+	gator_events_l2c310_reset_counters();
+
+	if (buffer)
+		*buffer = l2c310_buffer;
+
+	return len;
+}
+
+static struct gator_interface gator_events_l2c310_interface = {
+	.create_files = gator_events_l2c310_create_files,
+	.start = gator_events_l2c310_start,
+	.stop = gator_events_l2c310_stop,
+	.read = gator_events_l2c310_read,
+};
+
+static void __maybe_unused gator_events_l2c310_probe(unsigned long phys)
+{
+	if (l2c310_base)
+		return;
+
+	l2c310_base = ioremap(phys, SZ_4K);
+	if (l2c310_base) {
+		u32 cache_id = readl(l2c310_base + L2X0_CACHE_ID);
+
+		if ((cache_id & 0xff0003c0) != 0x410000c0) {
+			iounmap(l2c310_base);
+			l2c310_base = NULL;
+		}
+	}
+}
+
+int gator_events_l2c310_init(void)
+{
+	int i;
+
+	if (gator_cpuid() != CORTEX_A5 && gator_cpuid() != CORTEX_A9)
+		return -1;
+
+#if defined(CONFIG_ARCH_EXYNOS4) || defined(CONFIG_ARCH_S5PV310)
+	gator_events_l2c310_probe(0x10502000);
+#endif
+#if defined(CONFIG_ARCH_OMAP4)
+	gator_events_l2c310_probe(0x48242000);
+#endif
+#if defined(CONFIG_ARCH_TEGRA)
+	gator_events_l2c310_probe(0x50043000);
+#endif
+#if defined(CONFIG_ARCH_U8500)
+	gator_events_l2c310_probe(0xa0412000);
+#endif
+#if defined(CONFIG_ARCH_VEXPRESS)
+	// A9x4 core tile (HBI-0191)
+	gator_events_l2c310_probe(0x1e00a000);
+	// New memory map tiles
+	gator_events_l2c310_probe(0x2c0f0000);
+#endif
+	if (!l2c310_base)
+		return -1;
+
+	for (i = 0; i < L2C310_COUNTERS_NUM; i++) {
+		l2c310_counters[i].enabled = 0;
+		l2c310_counters[i].key = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_l2c310_interface);
+}
+gator_events_init(gator_events_l2c310_init);
diff --git a/drivers/gator/gator_events_mali.c b/drivers/gator/gator_events_mali.c
new file mode 100755
index 00000000000..e3b6e13923a
--- /dev/null
+++ b/drivers/gator/gator_events_mali.c
@@ -0,0 +1,732 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "gator.h"
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/math64.h>
+
+#include "linux/mali_linux_trace.h"
+
+#if !defined(GATOR_MALI_INTERFACE_STYLE)
+/*
+ * At the moment, we only have users with the old style interface, so
+ * make our life easier by making it the default...
+ */
+#define GATOR_MALI_INTERFACE_STYLE (2)
+#endif
+
+/*
+ * There are (currently) three different variants of the comms between gator and Mali:
+ * 1 (deprecated): No software counter support
+ * 2 (deprecated): Tracepoint called for each separate s/w counter value as it appears
+ * 3 (default): Single tracepoint for all s/w counters in a bundle.
+ * Interface style 3 is the default if no other is specified.  1 and 2 will be eliminated when
+ * existing Mali DDKs are upgraded.
+ */
+
+#if !defined(GATOR_MALI_INTERFACE_STYLE)
+#define GATOR_MALI_INTERFACE_STYLE (3)
+#endif
+
+#define MALI_200     (0x0a07)
+#define MALI_300     (0x0b06) //This is not actually true; Mali-300 is also 0x0b07
+#define MALI_400     (0x0b07)
+#define MALI_T6xx    (0x0056)
+
+/*
+ * List of possible actions allowing DDK to be controlled by Streamline.
+ * The following numbers are used by DDK to control the frame buffer dumping.
+ */
+#define FBDUMP_CONTROL_ENABLE (1)
+#define FBDUMP_CONTROL_RATE (2)
+#define SW_EVENTS_ENABLE      (3)
+#define FBDUMP_CONTROL_RESIZE_FACTOR (4)
+
+/*
+ * Check that the MALI_SUPPORT define is set to one of the allowable device codes.
+ */
+#if !defined(MALI_SUPPORT)
+#error MALI_SUPPORT not defined!
+#elif (MALI_SUPPORT != MALI_200) && (MALI_SUPPORT != MALI_300) && (MALI_SUPPORT != MALI_400) && (MALI_SUPPORT != MALI_T6xx)
+#error MALI_SUPPORT set to an invalid device code
+#endif
+
+static const char *mali_name;
+
+enum counters {
+    /* Timeline activity */
+    ACTIVITY_VP = 0,
+    ACTIVITY_FP0,
+    ACTIVITY_FP1,
+    ACTIVITY_FP2,
+    ACTIVITY_FP3,
+    
+    /* L2 cache counters */
+    COUNTER_L2_C0,
+    COUNTER_L2_C1,
+
+    /* Vertex processor counters */
+    COUNTER_VP_C0,
+    COUNTER_VP_C1, 
+
+    /* Fragment processor counters */
+    COUNTER_FP0_C0,    
+    COUNTER_FP0_C1,     
+    COUNTER_FP1_C0,
+    COUNTER_FP1_C1,
+    COUNTER_FP2_C0,
+    COUNTER_FP2_C1,
+    COUNTER_FP3_C0,
+    COUNTER_FP3_C1,
+
+    /* EGL Software Counters */
+    COUNTER_EGL_BLIT_TIME,
+
+    /* GLES Software Counters */
+    COUNTER_GLES_DRAW_ELEMENTS_CALLS,
+    COUNTER_GLES_DRAW_ELEMENTS_NUM_INDICES,
+    COUNTER_GLES_DRAW_ELEMENTS_NUM_TRANSFORMED,
+    COUNTER_GLES_DRAW_ARRAYS_CALLS,
+    COUNTER_GLES_DRAW_ARRAYS_NUM_TRANSFORMED,
+    COUNTER_GLES_DRAW_POINTS,
+    COUNTER_GLES_DRAW_LINES,
+    COUNTER_GLES_DRAW_LINE_LOOP,
+    COUNTER_GLES_DRAW_LINE_STRIP,
+    COUNTER_GLES_DRAW_TRIANGLES,
+    COUNTER_GLES_DRAW_TRIANGLE_STRIP,
+    COUNTER_GLES_DRAW_TRIANGLE_FAN,
+    COUNTER_GLES_NON_VBO_DATA_COPY_TIME,
+    COUNTER_GLES_UNIFORM_BYTES_COPIED_TO_MALI,
+    COUNTER_GLES_UPLOAD_TEXTURE_TIME,
+    COUNTER_GLES_UPLOAD_VBO_TIME,
+    COUNTER_GLES_NUM_FLUSHES,
+    COUNTER_GLES_NUM_VSHADERS_GENERATED,
+    COUNTER_GLES_NUM_FSHADERS_GENERATED,
+    COUNTER_GLES_VSHADER_GEN_TIME,
+    COUNTER_GLES_FSHADER_GEN_TIME,
+    COUNTER_GLES_INPUT_TRIANGLES,
+    COUNTER_GLES_VXCACHE_HIT,
+    COUNTER_GLES_VXCACHE_MISS,
+    COUNTER_GLES_VXCACHE_COLLISION,
+    COUNTER_GLES_CULLED_TRIANGLES,
+    COUNTER_GLES_CULLED_LINES,
+    COUNTER_GLES_BACKFACE_TRIANGLES,
+    COUNTER_GLES_GBCLIP_TRIANGLES,
+    COUNTER_GLES_GBCLIP_LINES,
+    COUNTER_GLES_TRIANGLES_DRAWN,
+    COUNTER_GLES_DRAWCALL_TIME,
+    COUNTER_GLES_TRIANGLES_COUNT,
+    COUNTER_GLES_INDEPENDENT_TRIANGLES_COUNT,
+    COUNTER_GLES_STRIP_TRIANGLES_COUNT,
+    COUNTER_GLES_FAN_TRIANGLES_COUNT,
+    COUNTER_GLES_LINES_COUNT,
+    COUNTER_GLES_INDEPENDENT_LINES_COUNT,
+    COUNTER_GLES_STRIP_LINES_COUNT,
+    COUNTER_GLES_LOOP_LINES_COUNT,
+
+	COUNTER_FILMSTRIP,
+
+    NUMBER_OF_EVENTS
+};
+
+#define FIRST_ACTIVITY_EVENT    ACTIVITY_VP
+#define LAST_ACTIVITY_EVENT     ACTIVITY_FP3
+
+#define FIRST_HW_COUNTER        COUNTER_L2_C0
+#define LAST_HW_COUNTER         COUNTER_FP3_C1
+
+#define FIRST_SW_COUNTER        COUNTER_EGL_BLIT_TIME
+#define LAST_SW_COUNTER         COUNTER_GLES_LOOP_LINES_COUNT
+
+#define FIRST_SPECIAL_COUNTER   COUNTER_FILMSTRIP
+#define LAST_SPECIAL_COUNTER    COUNTER_FILMSTRIP
+
+/* gatorfs variables for counter enable state,
+ * the event the counter should count and the
+ * 'key' (a unique id set by gatord and returned
+ * by gator.ko)
+ */
+static unsigned long counter_enabled[NUMBER_OF_EVENTS];
+static unsigned long counter_event[NUMBER_OF_EVENTS];
+static unsigned long counter_key[NUMBER_OF_EVENTS];
+
+/* The data we have recorded */
+static u32 counter_data[NUMBER_OF_EVENTS];
+/* The address to sample (or 0 if samples are sent to us) */
+static u32* counter_address[NUMBER_OF_EVENTS];
+
+/* An array used to return the data we recorded
+ * as key,value pairs hence the *2
+ */
+static unsigned long counter_dump[NUMBER_OF_EVENTS * 2];
+static unsigned long counter_prev[NUMBER_OF_EVENTS];
+
+/* Note whether tracepoints have been registered */
+static int trace_registered;
+
+/**
+ * Calculate the difference and handle the overflow.
+ */
+static u32 get_difference(u32 start, u32 end)
+{
+	if (start - end >= 0)
+	{
+		return start - end;
+	}
+
+	// Mali counters are unsigned 32 bit values that wrap.
+	return (4294967295u - end) + start;
+}
+
+/**
+ * Returns non-zero if the given counter ID is an activity counter.
+ */
+static inline int is_activity_counter(unsigned int event_id)
+{
+    return (event_id >= FIRST_ACTIVITY_EVENT && 
+        event_id <= LAST_ACTIVITY_EVENT);
+}
+
+/**
+ * Returns non-zero if the given counter ID is a hardware counter.
+ */
+static inline int is_hw_counter(unsigned int event_id)
+{
+    return (event_id >= FIRST_HW_COUNTER && event_id <= LAST_HW_COUNTER);
+}
+
+/**
+ * Returns non-zero if the given counter ID is a software counter.
+ */
+static inline int is_sw_counter(unsigned int event_id)
+{
+    return (event_id >= FIRST_SW_COUNTER && event_id <= LAST_SW_COUNTER);
+}
+
+/*
+ * The Mali DDK uses s64 types to contain software counter values, but gator
+ * can only use a maximum of 32 bits. This function scales a software counter
+ * to an appopriate range.
+ */
+static u32 scale_sw_counter_value(unsigned int event_id, signed long long value)
+{
+    u32 scaled_value;
+
+    switch (event_id) {
+        case COUNTER_GLES_UPLOAD_TEXTURE_TIME:
+        case COUNTER_GLES_UPLOAD_VBO_TIME:
+            scaled_value = (u32)div_s64(value, 1000000);
+            break;
+        default:
+            scaled_value = (u32)value;
+            break;
+    }
+
+    return scaled_value;
+}
+
+/* Probe for continuously sampled counter */
+#if 0 //WE_DONT_CURRENTLY_USE_THIS_SO_SUPPRESS_WARNING
+GATOR_DEFINE_PROBE(mali_sample_address, TP_PROTO(unsigned int event_id, u32* addr))
+{
+    /* Turning on too many pr_debug statements in frequently called functions
+     * can cause stability and/or performance problems
+     */
+    //pr_debug("gator: mali_sample_address %d %d\n", event_id, addr);
+    if (event_id >= ACTIVITY_VP && event_id <= COUNTER_FP3_C1) {
+        counter_address[event_id] = addr;
+    }
+}
+#endif
+
+/* Probe for hardware counter events */
+GATOR_DEFINE_PROBE(mali_hw_counter, TP_PROTO(unsigned int event_id, unsigned int value))
+{
+    /* Turning on too many pr_debug statements in frequently called functions
+     * can cause stability and/or performance problems
+     */
+    //pr_debug("gator: mali_hw_counter %d %d\n", event_id, value);
+    if (is_hw_counter(event_id)) {
+        counter_data[event_id] = value;
+    }
+}
+
+#if GATOR_MALI_INTERFACE_STYLE == 2
+GATOR_DEFINE_PROBE(mali_sw_counter, TP_PROTO(unsigned int event_id, signed long long value))
+{
+    if (is_sw_counter(event_id)) {
+        counter_data[event_id] = scale_sw_counter_value(event_id, value);
+    }
+}
+#endif /* GATOR_MALI_INTERFACE_STYLE == 2 */
+
+
+#if GATOR_MALI_INTERFACE_STYLE == 3
+GATOR_DEFINE_PROBE(mali_sw_counters, TP_PROTO(pid_t pid, pid_t tid, void * surface_id, unsigned int * counters))
+{
+	u32 i;
+
+	/* Copy over the values for those counters which are enabled. */
+	for(i=FIRST_SW_COUNTER; i <= LAST_SW_COUNTER; i++)
+	{
+		if(counter_enabled[i])
+		{
+			counter_data[i] = (u32)(counters[i - FIRST_SW_COUNTER]);
+		}
+	}
+}
+#endif /* GATOR_MALI_INTERFACE_STYLE == 3 */
+
+//TODO need to work out how many fp units we have
+u32 gator_mali_get_n_fp(void) {
+    return 4;
+}
+
+//TODO need to work out what kind of Mali we are looking at
+u32 gator_mali_get_id(void) {
+    return MALI_SUPPORT;
+}
+
+int gator_events_mali_create_files(struct super_block *sb, struct dentry *root) {
+    struct dentry *dir;
+    int event;
+    int n_fp = gator_mali_get_n_fp();
+
+    /*
+     * Create the filesystem entries for vertex processor, fragement processor
+     * and L2 cache timeline and hardware counters. Software counters get 
+     * special handling after this block.
+     */
+    for (event = FIRST_ACTIVITY_EVENT; event <= LAST_HW_COUNTER; event++)
+    {
+        char buf[40];
+
+        /* 
+         * We can skip this event if it's for a non-existent fragment
+         * processor.
+         */
+        if (((event - ACTIVITY_FP0 >= n_fp) && (event < COUNTER_L2_C0)) ||
+            (((event - COUNTER_FP0_C0)/2 >= n_fp)))
+        {
+            continue;
+        }
+
+        /* Otherwise, set up the filesystem entry for this event. */
+        switch (event) {
+            case ACTIVITY_VP:
+                snprintf(buf, sizeof buf, "ARM_%s_VP_active", mali_name);
+                break;
+            case ACTIVITY_FP0:
+            case ACTIVITY_FP1:
+            case ACTIVITY_FP2:
+            case ACTIVITY_FP3:
+                snprintf(buf, sizeof buf, "ARM_%s_FP%d_active", 
+                    mali_name, event - ACTIVITY_FP0);
+                break;
+            case COUNTER_L2_C0:
+            case COUNTER_L2_C1:
+                snprintf(buf, sizeof buf, "ARM_%s_L2_cnt%d", 
+                    mali_name, event - COUNTER_L2_C0);
+                break;
+            case COUNTER_VP_C0:
+            case COUNTER_VP_C1:
+                snprintf(buf, sizeof buf, "ARM_%s_VP_cnt%d", 
+                    mali_name, event - COUNTER_VP_C0);
+                break;
+            case COUNTER_FP0_C0:
+            case COUNTER_FP0_C1:
+            case COUNTER_FP1_C0:
+            case COUNTER_FP1_C1:
+            case COUNTER_FP2_C0:
+            case COUNTER_FP2_C1:
+            case COUNTER_FP3_C0:
+            case COUNTER_FP3_C1:
+                snprintf(buf, sizeof buf, "ARM_%s_FP%d_cnt%d", mali_name, 
+                    (event - COUNTER_FP0_C0) / 2, (event - COUNTER_FP0_C0) % 2);
+                break;
+            default:
+                printk("gator: trying to create file for non-existent counter (%d)\n", event);
+                continue;
+        }
+
+        dir = gatorfs_mkdir(sb, root, buf);
+        
+        if (!dir) {
+            return -1;
+        }
+        
+        gatorfs_create_ulong(sb, dir, "enabled", &counter_enabled[event]);
+        
+        /* Only create an event node for counters that can change what they count */
+        if (event >= COUNTER_L2_C0) {
+            gatorfs_create_ulong(sb, dir, "event", &counter_event[event]);
+        }
+        
+        gatorfs_create_ro_ulong(sb, dir, "key", &counter_key[event]);
+    }
+
+    /* Now set up the software counter entries */
+    for (event = FIRST_SW_COUNTER; event <= LAST_SW_COUNTER; event++)
+    {
+        char buf[40];
+
+        snprintf(buf, sizeof(buf), "ARM_%s_SW_%d", mali_name, event);
+
+        dir = gatorfs_mkdir(sb, root, buf);
+
+        if (!dir) {
+            return -1;
+        }
+
+        gatorfs_create_ulong(sb, dir, "enabled", &counter_enabled[event]);
+        gatorfs_create_ro_ulong(sb, dir, "key", &counter_key[event]);
+    }
+
+	/* Now set up the special counter entries */
+    for (event = FIRST_SPECIAL_COUNTER; event <= LAST_SPECIAL_COUNTER; event++)
+    {
+        char buf[40];
+
+        snprintf(buf, sizeof(buf), "ARM_%s_Filmstrip", mali_name);
+
+        dir = gatorfs_mkdir(sb, root, buf);
+
+        if (!dir) {
+            return -1;
+        }
+
+        gatorfs_create_ulong(sb, dir, "event", &counter_event[event]);
+        gatorfs_create_ulong(sb, dir, "enabled", &counter_enabled[event]);
+        gatorfs_create_ro_ulong(sb, dir, "key", &counter_key[event]);
+    }
+
+
+    return 0;
+}
+
+//TODO
+void _mali_profiling_set_event(unsigned int, unsigned int);
+void _mali_osk_fb_control_set(unsigned int, unsigned int);
+void _mali_profiling_control(unsigned int, unsigned int);
+
+void _mali_profiling_get_counters(unsigned int*, unsigned int*, unsigned int*, unsigned int*);
+void (*_mali_profiling_get_counters_function_pointer)(unsigned int*, unsigned int*, unsigned int*, unsigned int*);
+
+/*
+ * Examine list of software counters and determine if any one is enabled.
+ * Returns 1 if any counter is enabled, 0 if none is.
+ */
+static int is_any_sw_counter_enabled(void)
+{
+	unsigned int i;
+
+	for (i = FIRST_SW_COUNTER; i <= LAST_SW_COUNTER; i++)
+	{
+		if (counter_enabled[i])
+		{
+			return 1;	/* At least one counter is enabled */
+		}
+	}
+
+	return 0;	/* No s/w counters enabled */
+}
+
+static void mali_counter_initialize(void) 
+{
+    /* If a Mali driver is present and exporting the appropriate symbol
+     * then we can request the HW counters (of which there are only 2)
+     * be configured to count the desired events
+     */
+    void (*set_hw_event)(unsigned int, unsigned int);
+	void (*set_fb_event)(unsigned int, unsigned int);
+	void (*mali_control)(unsigned int, unsigned int);
+
+    set_hw_event = symbol_get(_mali_profiling_set_event);
+
+    if (set_hw_event) {
+        int i;
+
+        pr_debug("gator: mali online _mali_profiling_set_event symbol @ %p\n",set_hw_event);
+
+        for (i = FIRST_HW_COUNTER; i <= LAST_HW_COUNTER; i++) {
+            if (counter_enabled[i]) {
+                set_hw_event(i, counter_event[i]);
+            } else {
+                set_hw_event(i, 0xFFFFFFFF);
+            }
+        }
+
+        symbol_put(_mali_profiling_set_event);
+    } else {
+        printk("gator: mali online _mali_profiling_set_event symbol not found\n");
+    }
+
+	set_fb_event = symbol_get(_mali_osk_fb_control_set);
+
+	if (set_fb_event) {
+		pr_debug("gator: mali online _mali_osk_fb_control_set symbol @ %p\n", set_fb_event);
+
+        set_fb_event(0,(counter_enabled[COUNTER_FILMSTRIP]?1:0));
+
+		symbol_put(_mali_osk_fb_control_set);
+	} else {
+		printk("gator: mali online _mali_osk_fb_control_set symbol not found\n");
+	}
+
+	/* Generic control interface for Mali DDK. */
+	mali_control = symbol_get(_mali_profiling_control);
+	if (mali_control) {
+		/* The event attribute in the XML file keeps the actual frame rate. */
+		unsigned int rate = counter_event[COUNTER_FILMSTRIP] & 0xff;
+		unsigned int resize_factor = (counter_event[COUNTER_FILMSTRIP] >> 8) & 0xff;
+
+		pr_debug("gator: mali online _mali_profiling_control symbol @ %p\n", mali_control);
+
+		mali_control(SW_EVENTS_ENABLE, (is_any_sw_counter_enabled()?1:0));
+		mali_control(FBDUMP_CONTROL_ENABLE, (counter_enabled[COUNTER_FILMSTRIP]?1:0));
+		mali_control(FBDUMP_CONTROL_RATE, rate);
+		mali_control(FBDUMP_CONTROL_RESIZE_FACTOR, resize_factor);
+
+		pr_debug("gator: sent mali_control enabled=%d, rate=%d\n", (counter_enabled[COUNTER_FILMSTRIP]?1:0), rate);
+
+		symbol_put(_mali_profiling_control);
+	} else {
+		printk("gator: mali online _mali_profiling_control symbol not found\n");
+	}
+
+	_mali_profiling_get_counters_function_pointer =  symbol_get(_mali_profiling_get_counters);
+	if (_mali_profiling_get_counters_function_pointer){
+		pr_debug("gator: mali online _mali_profiling_get_counters symbol @ %p\n", _mali_profiling_get_counters_function_pointer);
+		counter_prev[COUNTER_L2_C0] = 0;
+		counter_prev[COUNTER_L2_C1] = 0;
+	}
+	else{
+		pr_debug("gator WARNING: mali _mali_profiling_get_counters symbol  not defined");
+	}
+}
+
+static void mali_counter_deinitialize(void) 
+{
+    void (*set_hw_event)(unsigned int, unsigned int);
+	void (*set_fb_event)(unsigned int, unsigned int);
+	void (*mali_control)(unsigned int, unsigned int);
+
+    set_hw_event = symbol_get(_mali_profiling_set_event);
+
+    if (set_hw_event) {
+        int i;
+        
+        pr_debug("gator: mali offline _mali_profiling_set_event symbol @ %p\n",set_hw_event);
+        for (i = FIRST_HW_COUNTER; i <= LAST_HW_COUNTER; i++) {
+            set_hw_event(i, 0xFFFFFFFF);
+        }
+        
+        symbol_put(_mali_profiling_set_event);
+    } else {
+        printk("gator: mali offline _mali_profiling_set_event symbol not found\n");
+    }
+
+	set_fb_event = symbol_get(_mali_osk_fb_control_set);
+
+	if (set_fb_event) {
+		pr_debug("gator: mali offline _mali_osk_fb_control_set symbol @ %p\n", set_fb_event);
+
+        set_fb_event(0,0);
+
+		symbol_put(_mali_osk_fb_control_set);
+	} else {
+		printk("gator: mali offline _mali_osk_fb_control_set symbol not found\n");
+	}
+	
+	/* Generic control interface for Mali DDK. */
+	mali_control = symbol_get(_mali_profiling_control);
+
+	if (mali_control) {
+		pr_debug("gator: mali offline _mali_profiling_control symbol @ %p\n", set_fb_event);
+
+		/* Reset the DDK state - disable counter collection */
+		mali_control(SW_EVENTS_ENABLE, 0);
+
+		mali_control(FBDUMP_CONTROL_ENABLE, 0);
+
+		symbol_put(_mali_profiling_control);
+	} else {
+		printk("gator: mali offline _mali_profiling_control symbol not found\n");
+	}
+
+	if (_mali_profiling_get_counters_function_pointer){
+		symbol_put(_mali_profiling_get_counters);
+	}
+
+}
+
+static int gator_events_mali_start(void) {
+    // register tracepoints
+    if (GATOR_REGISTER_TRACE(mali_hw_counter)) {
+        printk("gator: mali_hw_counter tracepoint failed to activate\n");
+        return -1;
+    }
+
+#if GATOR_MALI_INTERFACE_STYLE == 1
+		/* None. */
+#elif GATOR_MALI_INTERFACE_STYLE == 2
+		/* For patched Mali driver. */
+    if (GATOR_REGISTER_TRACE(mali_sw_counter)) {
+        printk("gator: mali_sw_counter tracepoint failed to activate\n");
+        return -1;
+    }
+#elif GATOR_MALI_INTERFACE_STYLE == 3
+/* For Mali drivers with built-in support. */
+    if (GATOR_REGISTER_TRACE(mali_sw_counters)) {
+        printk("gator: mali_sw_counters tracepoint failed to activate\n");
+        return -1;
+    }
+#else
+#error Unknown GATOR_MALI_INTERFACE_STYLE option.
+#endif
+
+    trace_registered = 1;
+
+    mali_counter_initialize();
+    return 0;
+}
+
+static void gator_events_mali_stop(void) {
+    unsigned int cnt;
+
+    pr_debug("gator: mali stop\n");
+
+    if (trace_registered) {
+        GATOR_UNREGISTER_TRACE(mali_hw_counter);
+
+#if GATOR_MALI_INTERFACE_STYLE == 1
+    /* None. */
+#elif GATOR_MALI_INTERFACE_STYLE == 2
+    /* For patched Mali driver. */
+    GATOR_UNREGISTER_TRACE(mali_sw_counter);
+#elif GATOR_MALI_INTERFACE_STYLE == 3
+    /* For Mali drivers with built-in support. */
+    GATOR_UNREGISTER_TRACE(mali_sw_counters);
+#else
+#error Unknown GATOR_MALI_INTERFACE_STYLE option.
+#endif
+
+        pr_debug("gator: mali timeline tracepoint deactivated\n");
+        
+        trace_registered = 0;
+    }
+
+    for (cnt = FIRST_ACTIVITY_EVENT; cnt < NUMBER_OF_EVENTS; cnt++) {
+        counter_enabled[cnt] = 0;
+        counter_event[cnt] = 0;
+        counter_address[cnt] = NULL;
+    }
+
+    mali_counter_deinitialize();
+}
+
+static int gator_events_mali_read(int **buffer) {
+    int cnt, len = 0;
+
+    if (smp_processor_id()) return 0;
+
+    // Read the L2 C0 and C1 here.
+    if (counter_enabled[COUNTER_L2_C0] || counter_enabled[COUNTER_L2_C1] ) {
+        u32 src0 = 0;
+        u32 val0 = 0;
+        u32 src1 = 0;
+        u32 val1 = 0;
+
+        // Poke the driver to get the counter values
+        if (_mali_profiling_get_counters_function_pointer){
+            _mali_profiling_get_counters_function_pointer(&src0, &val0, &src1, &val1);
+        }
+
+        if (counter_enabled[COUNTER_L2_C0])
+        {
+            // Calculate and save src0's counter val0
+            counter_dump[len++] = counter_key[COUNTER_L2_C0];
+            counter_dump[len++] = get_difference(val0, counter_prev[COUNTER_L2_C0]);
+        }
+
+        if (counter_enabled[COUNTER_L2_C1])
+        {
+            // Calculate and save src1's counter val1
+            counter_dump[len++] = counter_key[COUNTER_L2_C1];
+            counter_dump[len++] = get_difference(val1, counter_prev[COUNTER_L2_C1]);
+        }
+
+        // Save the previous values for the counters.
+        counter_prev[COUNTER_L2_C0] = val0;
+        counter_prev[COUNTER_L2_C1] = val1;
+    }
+
+    // Process other (non-timeline) counters.
+    for (cnt = COUNTER_VP_C0; cnt <= LAST_SW_COUNTER; cnt++) {
+        if (counter_enabled[cnt]) {
+            counter_dump[len++] = counter_key[cnt];
+            counter_dump[len++] = counter_data[cnt];
+
+            counter_data[cnt] = 0;
+        }
+    }
+
+    if (buffer) {
+        *buffer = (int*) counter_dump;
+    }
+
+    return len;
+}
+
+static struct gator_interface gator_events_mali_interface = {
+    .create_files = gator_events_mali_create_files,
+    .start = gator_events_mali_start,
+    .stop = gator_events_mali_stop,
+    .read = gator_events_mali_read,
+};
+
+int gator_events_mali_init(void)
+{
+    unsigned int cnt;
+    u32 id = gator_mali_get_id();
+
+    switch (id) {
+    case MALI_T6xx:
+        mali_name = "Mali-T6xx";
+        break;
+    case MALI_400:
+        mali_name = "Mali-400";
+        break;
+    case MALI_300:
+        mali_name = "Mali-300";
+        break;
+    case MALI_200:
+        mali_name = "Mali-200";
+        break;
+    default:
+        printk("Unknown Mali ID (%d)\n", id);
+        return -1;
+    }
+
+    pr_debug("gator: mali init\n");
+
+    for (cnt = FIRST_ACTIVITY_EVENT; cnt < NUMBER_OF_EVENTS; cnt++) {
+        counter_enabled[cnt] = 0;
+        counter_event[cnt] = 0;
+        counter_key[cnt] = gator_events_get_key();
+        counter_address[cnt] = NULL;
+		counter_data[cnt] = 0;
+    }
+
+    trace_registered = 0;
+
+    return gator_events_install(&gator_events_mali_interface);
+}
+gator_events_init(gator_events_mali_init);
diff --git a/drivers/gator/gator_events_meminfo.c b/drivers/gator/gator_events_meminfo.c
new file mode 100644
index 00000000000..ad552ef6c6e
--- /dev/null
+++ b/drivers/gator/gator_events_meminfo.c
@@ -0,0 +1,230 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include "gator.h"
+#include <linux/workqueue.h>
+#include <trace/events/kmem.h>
+#include <linux/hardirq.h>
+
+#define MEMINFO_MEMFREE		0
+#define MEMINFO_MEMUSED		1
+#define MEMINFO_BUFFERRAM	2
+#define MEMINFO_TOTAL		3
+
+static ulong meminfo_global_enabled;
+static ulong meminfo_enabled[MEMINFO_TOTAL];
+static ulong meminfo_key[MEMINFO_TOTAL];
+static unsigned long long meminfo_buffer[MEMINFO_TOTAL * 2];
+static int meminfo_length = 0;
+static unsigned int mem_event = 0;
+static bool new_data_avail;
+
+static void wq_sched_handler(struct work_struct *wsptr);
+
+DECLARE_WORK(work, wq_sched_handler);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+GATOR_DEFINE_PROBE(mm_page_free_direct, TP_PROTO(struct page *page, unsigned int order)) {
+#else
+GATOR_DEFINE_PROBE(mm_page_free, TP_PROTO(struct page *page, unsigned int order)) {
+#endif
+	mem_event++;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+GATOR_DEFINE_PROBE(mm_pagevec_free, TP_PROTO(struct page *page, int cold)) {
+#else
+GATOR_DEFINE_PROBE(mm_page_free_batched, TP_PROTO(struct page *page, int cold)) {
+#endif
+	mem_event++;
+}
+
+GATOR_DEFINE_PROBE(mm_page_alloc, TP_PROTO(struct page *page, unsigned int order, gfp_t gfp_flags, int migratetype)) {
+	mem_event++;
+}
+
+static int gator_events_meminfo_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	int i;
+
+	for (i = 0; i < MEMINFO_TOTAL; i++) {
+		switch (i) {
+		case MEMINFO_MEMFREE:
+			dir = gatorfs_mkdir(sb, root, "Linux_meminfo_memfree");
+			break;
+		case MEMINFO_MEMUSED:
+			dir = gatorfs_mkdir(sb, root, "Linux_meminfo_memused");
+			break;
+		case MEMINFO_BUFFERRAM:
+			dir = gatorfs_mkdir(sb, root, "Linux_meminfo_bufferram");
+			break;
+		default:
+			return -1;
+		}
+		if (!dir) {
+			return -1;
+		}
+		gatorfs_create_ulong(sb, dir, "enabled", &meminfo_enabled[i]);
+		gatorfs_create_ro_ulong(sb, dir, "key", &meminfo_key[i]);
+	}
+
+	return 0;
+}
+
+static int gator_events_meminfo_start(void)
+{
+	int i;
+
+	new_data_avail = true;
+	for (i = 0; i < MEMINFO_TOTAL; i++) {
+		if (meminfo_enabled[i]) {
+			meminfo_global_enabled = 1;
+		}
+	}
+
+	if (meminfo_global_enabled == 0)
+		return 0;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+	if (GATOR_REGISTER_TRACE(mm_page_free_direct))
+#else
+	if (GATOR_REGISTER_TRACE(mm_page_free))
+#endif
+		goto mm_page_free_exit;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+	if (GATOR_REGISTER_TRACE(mm_pagevec_free))
+#else
+	if (GATOR_REGISTER_TRACE(mm_page_free_batched))
+#endif
+		goto mm_page_free_batched_exit;
+	if (GATOR_REGISTER_TRACE(mm_page_alloc))
+		goto mm_page_alloc_exit;
+
+	return 0;
+
+mm_page_alloc_exit:
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+	GATOR_UNREGISTER_TRACE(mm_pagevec_free);
+#else
+	GATOR_UNREGISTER_TRACE(mm_page_free_batched);
+#endif
+mm_page_free_batched_exit:
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+	GATOR_UNREGISTER_TRACE(mm_page_free_direct);
+#else
+	GATOR_UNREGISTER_TRACE(mm_page_free);
+#endif
+mm_page_free_exit:
+	return -1;
+}
+
+static void gator_events_meminfo_stop(void)
+{
+	int i;
+
+	if (meminfo_global_enabled) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+		GATOR_UNREGISTER_TRACE(mm_page_free_direct);
+		GATOR_UNREGISTER_TRACE(mm_pagevec_free);
+#else
+		GATOR_UNREGISTER_TRACE(mm_page_free);
+		GATOR_UNREGISTER_TRACE(mm_page_free_batched);
+#endif
+		GATOR_UNREGISTER_TRACE(mm_page_alloc);
+	}
+
+	meminfo_global_enabled = 0;
+	for (i = 0; i < MEMINFO_TOTAL; i++) {
+		meminfo_enabled[i] = 0;
+	}
+}
+
+// Must be run in process context (work queue) as the kernel function si_meminfo() can sleep
+static void wq_sched_handler(struct work_struct *wsptr)
+{
+	struct sysinfo info;
+	int i, len;
+	unsigned long long value;
+
+	meminfo_length = len = 0;
+
+	si_meminfo(&info);
+	for (i = 0; i < MEMINFO_TOTAL; i++) {
+		if (meminfo_enabled[i]) {
+			switch (i) {
+			case MEMINFO_MEMFREE:
+				value = info.freeram * PAGE_SIZE;
+				break;
+			case MEMINFO_MEMUSED:
+				value = (info.totalram - info.freeram) * PAGE_SIZE;
+				break;
+			case MEMINFO_BUFFERRAM:
+				value = info.bufferram * PAGE_SIZE;
+				break;
+			default:
+				value = 0;
+				break;
+			}
+			meminfo_buffer[len++] = (unsigned long long)meminfo_key[i];
+			meminfo_buffer[len++] = value;
+		}
+	}
+
+	meminfo_length = len;
+	new_data_avail = true;
+}
+
+static int gator_events_meminfo_read(long long **buffer)
+{
+	static unsigned int last_mem_event = 0;
+
+	if (smp_processor_id() || !meminfo_global_enabled)
+		return 0;
+
+	if (last_mem_event != mem_event) {
+		last_mem_event = mem_event;
+		if (in_interrupt()) {
+			schedule_work(&work);
+		} else {
+			wq_sched_handler(NULL);
+		}
+	}
+
+	if (!new_data_avail)
+		return 0;
+
+	new_data_avail = false;
+
+	if (buffer)
+		*buffer = meminfo_buffer;
+
+	return meminfo_length;
+}
+
+static struct gator_interface gator_events_meminfo_interface = {
+	.create_files = gator_events_meminfo_create_files,
+	.start = gator_events_meminfo_start,
+	.stop = gator_events_meminfo_stop,
+	.read64 = gator_events_meminfo_read,
+};
+
+int gator_events_meminfo_init(void)
+{
+	int i;
+
+	meminfo_global_enabled = 0;
+	for (i = 0; i < MEMINFO_TOTAL; i++) {
+		meminfo_enabled[i] = 0;
+		meminfo_key[i] = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_meminfo_interface);
+}
+gator_events_init(gator_events_meminfo_init);
diff --git a/drivers/gator/gator_events_mmaped.c b/drivers/gator/gator_events_mmaped.c
new file mode 100644
index 00000000000..f81c40240d9
--- /dev/null
+++ b/drivers/gator/gator_events_mmaped.c
@@ -0,0 +1,231 @@
+/*
+ * Example events provider
+ *
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Similar entries to those below must be present in the events.xml file.
+ * To add them to the events.xml, create an events-mmap.xml with the 
+ * following contents and rebuild gatord:
+ *
+ * <counter_set name="mmaped_cntX">
+ *   <counter name="mmaped_cnt0"/>
+ *   <counter name="mmaped_cnt1"/>
+ *   <counter name="mmaped_cnt2"/>
+ * </counter_set>
+ * <category name="mmaped" counter_set="mmaped_cntX" per_cpu="no">
+ *   <event event="0x0" title="Simulated" name="Sine" display="maximum" average_selection="yes" description="Sort-of-sine"/>
+ *   <event event="0x1" title="Simulated" name="Triangle" display="maximum" average_selection="yes" description="Triangular wave"/>
+ *   <event event="0x2" title="Simulated" name="PWM" display="maximum" average_selection="yes" description="PWM Signal"/>
+ * </category>
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ratelimit.h>
+
+#include "gator.h"
+
+#define MMAPED_COUNTERS_NUM 3
+
+static struct {
+	unsigned long enabled;
+	unsigned long event;
+	unsigned long key;
+} mmaped_counters[MMAPED_COUNTERS_NUM];
+
+static int mmaped_buffer[MMAPED_COUNTERS_NUM * 2];
+
+#ifdef TODO
+static void __iomem *mmaped_base;
+#endif
+
+#ifndef TODO
+static s64 prev_time;
+#endif
+
+/* Adds mmaped_cntX directories and enabled, event, and key files to /dev/gator/events */
+static int gator_events_mmaped_create_files(struct super_block *sb,
+		struct dentry *root)
+{
+	int i;
+
+	for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
+		char buf[16];
+		struct dentry *dir;
+
+		snprintf(buf, sizeof(buf), "mmaped_cnt%d", i);
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (WARN_ON(!dir))
+			return -1;
+		gatorfs_create_ulong(sb, dir, "enabled",
+				&mmaped_counters[i].enabled);
+		gatorfs_create_ulong(sb, dir, "event",
+				&mmaped_counters[i].event);
+		gatorfs_create_ro_ulong(sb, dir, "key",
+				&mmaped_counters[i].key);
+	}
+
+	return 0;
+}
+
+static int gator_events_mmaped_start(void)
+{
+#ifdef TODO
+	for (i = 0; i < MMAPED_COUNTERS_NUM; i++)
+		writel(mmaped_counters[i].event,
+				mmaped_base + COUNTERS_CONFIG_OFFSET[i]);
+
+	writel(ENABLED, COUNTERS_CONTROL_OFFSET);
+#endif
+
+#ifndef TODO
+	struct timespec ts;
+	getnstimeofday(&ts);
+	prev_time = timespec_to_ns(&ts);
+#endif
+
+	return 0;
+}
+
+static void gator_events_mmaped_stop(void)
+{
+#ifdef TODO
+	writel(DISABLED, COUNTERS_CONTROL_OFFSET);
+#endif
+}
+
+#ifndef TODO
+/* This function "simulates" counters, generating values of fancy
+ * functions like sine or triangle... */
+static int mmaped_simulate(int counter, int delta_in_us)
+{
+	int result = 0;
+
+	switch (counter) {
+	case 0: /* sort-of-sine */
+		{
+			static int t = 0;
+			int x;
+
+			t += delta_in_us;
+			if (t > 2048000)
+				t = 0;
+
+			if (t % 1024000 < 512000)
+				x = 512000 - (t % 512000);
+			else
+				x = t % 512000;
+
+			result = 32 * x / 512000;
+			result = result * result;
+
+			if (t < 1024000)
+				result = 1922 - result;
+		}
+		break;
+	case 1: /* triangle */
+		{
+			static int v, d = 1;
+
+			v = v + d * delta_in_us;
+			if (v < 0) {
+				v = 0;
+				d = 1;
+			} else if (v > 1000000) {
+				v = 1000000;
+				d = -1;
+			}
+
+			result = v;
+		}
+		break;
+	case 2: /* PWM signal */
+		{
+			static int t, dc, x;
+
+			t += delta_in_us;
+			if (t > 1000000)
+				t = 0;
+			if (x / 1000000 != (x + delta_in_us) / 1000000)
+				dc = (dc + 100000) % 1000000;
+			x += delta_in_us;
+			
+			result = t < dc ? 0 : 10;
+		}
+		break;
+	}
+
+	return result;
+}
+#endif
+
+static int gator_events_mmaped_read(int **buffer)
+{
+	int i;
+	int len = 0;
+#ifndef TODO
+	int delta_in_us;
+	struct timespec ts;
+	s64 time;
+#endif
+
+	/* System wide counters - read from one core only */
+	if (smp_processor_id())
+		return 0;
+
+#ifndef TODO	
+	getnstimeofday(&ts);
+	time = timespec_to_ns(&ts);
+	delta_in_us = (int)(time - prev_time) / 1000;
+	prev_time = time;
+#endif
+
+	for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
+		if (mmaped_counters[i].enabled) {
+			mmaped_buffer[len++] = mmaped_counters[i].key;
+#ifdef TODO
+			mmaped_buffer[len++] = readl(mmaped_base +
+					COUNTERS_VALUE_OFFSET[i]);
+#else
+			mmaped_buffer[len++] = mmaped_simulate(
+					mmaped_counters[i].event, delta_in_us);
+#endif
+		}
+	}
+	
+	if (buffer)
+		*buffer = mmaped_buffer;
+
+	return len;
+}
+
+static struct gator_interface gator_events_mmaped_interface = {
+	.create_files = gator_events_mmaped_create_files,
+	.start = gator_events_mmaped_start,
+	.stop = gator_events_mmaped_stop,
+	.read = gator_events_mmaped_read,
+};
+
+/* Must not be static! */
+int __init gator_events_mmaped_init(void)
+{
+	int i;
+
+#ifdef TODO
+	mmaped_base = ioremap(COUNTERS_PHYS_ADDR, SZ_4K);
+	if (!mmaped_base)
+		return -ENOMEM;	
+#endif
+
+	for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
+		mmaped_counters[i].enabled = 0;
+		mmaped_counters[i].key = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_mmaped_interface);
+}
+gator_events_init(gator_events_mmaped_init);
diff --git a/drivers/gator/gator_events_net.c b/drivers/gator/gator_events_net.c
new file mode 100644
index 00000000000..9298905e626
--- /dev/null
+++ b/drivers/gator/gator_events_net.c
@@ -0,0 +1,157 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include "gator.h"
+#include <linux/netdevice.h>
+#include <linux/hardirq.h>
+
+#define NETRX		0
+#define NETTX		1
+#define TOTALNET	2
+
+static ulong netrx_enabled;
+static ulong nettx_enabled;
+static ulong netrx_key;
+static ulong nettx_key;
+static int rx_total, tx_total;
+static ulong netPrev[TOTALNET];
+static int netGet[TOTALNET * 4];
+
+static void get_network_stats(struct work_struct *wsptr) {
+	int rx = 0, tx = 0;
+	struct net_device *dev;
+
+	for_each_netdev(&init_net, dev) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+		const struct net_device_stats *stats = dev_get_stats(dev);
+#else
+		struct rtnl_link_stats64 temp;
+		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
+#endif
+		rx += stats->rx_bytes;
+		tx += stats->tx_bytes;
+	}
+	rx_total = rx;
+	tx_total = tx;
+}
+DECLARE_WORK(wq_get_stats, get_network_stats);
+
+static void calculate_delta(int *rx, int *tx)
+{
+	int rx_calc, tx_calc;
+
+	rx_calc = (int)(rx_total - netPrev[NETRX]);
+	if (rx_calc < 0)
+		rx_calc = 0;
+	netPrev[NETRX] += rx_calc;
+
+	tx_calc = (int)(tx_total - netPrev[NETTX]);
+	if (tx_calc < 0)
+		tx_calc = 0;
+	netPrev[NETTX] += tx_calc;
+
+	*rx = rx_calc;
+	*tx = tx_calc;
+}
+
+static int gator_events_net_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+
+	dir = gatorfs_mkdir(sb, root, "Linux_net_rx");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &netrx_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &netrx_key);
+
+	dir = gatorfs_mkdir(sb, root, "Linux_net_tx");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &nettx_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &nettx_key);
+
+	return 0;
+}
+
+static int gator_events_net_start(void)
+{
+	get_network_stats(NULL);
+	netPrev[NETRX] = rx_total;
+	netPrev[NETTX] = tx_total;
+	return 0;
+}
+
+static void gator_events_net_stop(void)
+{
+	netrx_enabled = 0;
+	nettx_enabled = 0;
+}
+
+static int gator_events_net_read(int **buffer)
+{
+	int len, rx_delta, tx_delta;
+	static int last_rx_delta = 0, last_tx_delta = 0;
+
+	if (smp_processor_id() != 0)
+		return 0;
+
+	if (!netrx_enabled && !nettx_enabled)
+		return 0;
+
+	if (in_interrupt()){
+		schedule_work(&wq_get_stats);
+	} else {
+		get_network_stats(NULL);
+	}
+
+	calculate_delta(&rx_delta, &tx_delta);
+
+	len = 0;
+	if (netrx_enabled && last_rx_delta != rx_delta) {
+		last_rx_delta = rx_delta;
+		netGet[len++] = netrx_key;
+		netGet[len++] = 0; // indicates to Streamline that rx_delta bytes were transmitted now, not since the last message
+		netGet[len++] = netrx_key;
+		netGet[len++] = rx_delta;
+	}
+
+	if (nettx_enabled && last_tx_delta != tx_delta) {
+		last_tx_delta = tx_delta;
+		netGet[len++] = nettx_key;
+		netGet[len++] = 0; // indicates to Streamline that tx_delta bytes were transmitted now, not since the last message
+		netGet[len++] = nettx_key;
+		netGet[len++] = tx_delta;
+	}
+
+	if (buffer)
+		*buffer = netGet;
+
+	return len;
+}
+
+static struct gator_interface gator_events_net_interface = {
+	.create_files = gator_events_net_create_files,
+	.start = gator_events_net_start,
+	.stop = gator_events_net_stop,
+	.read = gator_events_net_read,
+};
+
+int gator_events_net_init(void)
+{
+	netrx_key = gator_events_get_key();
+	nettx_key = gator_events_get_key();
+
+	netrx_enabled = 0;
+	nettx_enabled = 0;
+
+	return gator_events_install(&gator_events_net_interface);
+}
+gator_events_init(gator_events_net_init);
diff --git a/drivers/gator/gator_events_perf_pmu.c b/drivers/gator/gator_events_perf_pmu.c
new file mode 100755
index 00000000000..da76a9cb409
--- /dev/null
+++ b/drivers/gator/gator_events_perf_pmu.c
@@ -0,0 +1,306 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/slab.h>
+#include <linux/perf_event.h>
+#include "gator.h"
+
+// gator_events_armvX.c is used for Linux 2.6.x
+#if GATOR_PERF_PMU_SUPPORT
+
+static const char *pmnc_name;
+int pmnc_counters;
+int ccnt = 0;
+
+#define CNTMAX (6+1)
+
+static DEFINE_MUTEX(perf_mutex);
+
+unsigned long pmnc_enabled[CNTMAX];
+unsigned long pmnc_event[CNTMAX];
+unsigned long pmnc_count[CNTMAX];
+unsigned long pmnc_key[CNTMAX];
+
+static DEFINE_PER_CPU(int[CNTMAX], perfCurr);
+static DEFINE_PER_CPU(int[CNTMAX], perfPrev);
+static DEFINE_PER_CPU(int[CNTMAX], perfPrevDelta);
+static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt);
+static DEFINE_PER_CPU(struct perf_event *[CNTMAX], pevent);
+static DEFINE_PER_CPU(struct perf_event_attr *[CNTMAX], pevent_attr);
+
+static void gator_events_perf_pmu_stop(void);
+
+static int gator_events_perf_pmu_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	int i;
+
+	for (i = 0; i < pmnc_counters; i++) {
+		char buf[40];
+		if (i == 0) {
+			snprintf(buf, sizeof buf, "%s_ccnt", pmnc_name);
+		} else {
+			snprintf(buf, sizeof buf, "%s_cnt%d", pmnc_name, i-1);
+		}
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (!dir) {
+			return -1;
+		}
+		gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
+		gatorfs_create_ulong(sb, dir, "count", &pmnc_count[i]);
+		gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);
+		if (i > 0) {
+			gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
+		}
+	}
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+static void dummy_handler(struct perf_event *event, int unused, struct perf_sample_data *data, struct pt_regs *regs)
+#else
+static void dummy_handler(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs)
+#endif
+{
+// Required as perf_event_create_kernel_counter() requires an overflow handler, even though all we do is poll
+}
+
+static int gator_events_perf_pmu_online(int** buffer)
+{
+	int cnt, len = 0, cpu = smp_processor_id();
+
+	// read the counters and toss the invalid data, return zero instead
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		struct perf_event * ev = per_cpu(pevent, cpu)[cnt];
+		if (ev != NULL && ev->state == PERF_EVENT_STATE_ACTIVE) {
+			ev->pmu->read(ev);
+			per_cpu(perfPrev, cpu)[cnt] = per_cpu(perfCurr, cpu)[cnt] = local64_read(&ev->count);
+			per_cpu(perfPrevDelta, cpu)[cnt] = 0;
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = 0;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static void gator_events_perf_pmu_online_dispatch(int cpu)
+{
+	int cnt;
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (per_cpu(pevent, cpu)[cnt] != NULL || per_cpu(pevent_attr, cpu)[cnt] == 0)
+			continue;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+		per_cpu(pevent, cpu)[cnt] = perf_event_create_kernel_counter(per_cpu(pevent_attr, cpu)[cnt], cpu, 0, dummy_handler);
+#else
+		per_cpu(pevent, cpu)[cnt] = perf_event_create_kernel_counter(per_cpu(pevent_attr, cpu)[cnt], cpu, 0, dummy_handler, 0);
+#endif
+		if (IS_ERR(per_cpu(pevent, cpu)[cnt])) {
+			pr_debug("gator: unable to online a counter on cpu %d\n", cpu);
+			per_cpu(pevent, cpu)[cnt] = NULL;
+			continue;
+		}
+
+		if (per_cpu(pevent, cpu)[cnt]->state != PERF_EVENT_STATE_ACTIVE) {
+			pr_debug("gator: inactive counter on cpu %d\n", cpu);
+			perf_event_release_kernel(per_cpu(pevent, cpu)[cnt]);
+			per_cpu(pevent, cpu)[cnt] = NULL;
+			continue;
+		}
+	}
+}
+
+static void gator_events_perf_pmu_offline_dispatch(int cpu)
+{
+	int cnt;
+	struct perf_event * pe;
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		pe = NULL;
+		mutex_lock(&perf_mutex);
+		if (per_cpu(pevent, cpu)[cnt]) {
+			pe = per_cpu(pevent, cpu)[cnt];
+			per_cpu(pevent, cpu)[cnt] = NULL;
+		}
+		mutex_unlock(&perf_mutex);
+
+		if (pe) {
+			perf_event_release_kernel(pe);
+		}
+	}
+}
+
+static int gator_events_perf_pmu_start(void)
+{
+	int cnt, cpu;
+	u32 size = sizeof(struct perf_event_attr);
+
+	for_each_present_cpu(cpu) {
+		for (cnt = 0; cnt < pmnc_counters; cnt++) {
+			per_cpu(pevent, cpu)[cnt] = NULL;
+			if (!pmnc_enabled[cnt]) // Skip disabled counters
+				continue;
+
+			per_cpu(perfPrev, cpu)[cnt] = 0;
+			per_cpu(perfCurr, cpu)[cnt] = 0;
+			per_cpu(perfPrevDelta, cpu)[cnt] = 0;
+			per_cpu(pevent_attr, cpu)[cnt] = kmalloc(size, GFP_KERNEL);
+			if (!per_cpu(pevent_attr, cpu)[cnt]) {
+				gator_events_perf_pmu_stop();
+				return -1;
+			}
+
+			memset(per_cpu(pevent_attr, cpu)[cnt], 0, size);
+			per_cpu(pevent_attr, cpu)[cnt]->type = PERF_TYPE_RAW;
+			per_cpu(pevent_attr, cpu)[cnt]->size = size;
+			per_cpu(pevent_attr, cpu)[cnt]->config = pmnc_event[cnt];
+			per_cpu(pevent_attr, cpu)[cnt]->sample_period = 0;
+			per_cpu(pevent_attr, cpu)[cnt]->pinned = 1;
+
+			// handle special case for ccnt
+			if (cnt == ccnt) {
+				per_cpu(pevent_attr, cpu)[cnt]->type = PERF_TYPE_HARDWARE;
+				per_cpu(pevent_attr, cpu)[cnt]->config = PERF_COUNT_HW_CPU_CYCLES;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static void gator_events_perf_pmu_stop(void)
+{
+	unsigned int cnt, cpu;
+
+	for_each_present_cpu(cpu) {
+		for (cnt = 0; cnt < pmnc_counters; cnt++) {
+			if (per_cpu(pevent_attr, cpu)[cnt]) {
+				kfree(per_cpu(pevent_attr, cpu)[cnt]);
+				per_cpu(pevent_attr, cpu)[cnt] = NULL;
+			}
+		}
+	}
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+		pmnc_count[cnt] = 0;
+	}
+}
+
+static int gator_events_perf_pmu_read(int **buffer)
+{
+	int cnt, delta, len = 0;
+	int cpu = smp_processor_id();
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		struct perf_event * ev = per_cpu(pevent, cpu)[cnt];
+		if (ev != NULL && ev->state == PERF_EVENT_STATE_ACTIVE) {
+			ev->pmu->read(ev);
+			per_cpu(perfCurr, cpu)[cnt] = local64_read(&ev->count);
+			delta = per_cpu(perfCurr, cpu)[cnt] - per_cpu(perfPrev, cpu)[cnt];
+			if (delta != per_cpu(perfPrevDelta, cpu)[cnt]) {
+				per_cpu(perfPrevDelta, cpu)[cnt] = delta;
+				per_cpu(perfPrev, cpu)[cnt] = per_cpu(perfCurr, cpu)[cnt];
+				per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+				if (delta < 0)
+					delta *= -1;
+				per_cpu(perfCnt, cpu)[len++] = delta;
+			}
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_perf_pmu_interface = {
+	.create_files = gator_events_perf_pmu_create_files,
+	.start = gator_events_perf_pmu_start,
+	.stop = gator_events_perf_pmu_stop,
+	.online = gator_events_perf_pmu_online,
+	.online_dispatch = gator_events_perf_pmu_online_dispatch,
+	.offline_dispatch = gator_events_perf_pmu_offline_dispatch,
+	.read = gator_events_perf_pmu_read,
+};
+
+int gator_events_perf_pmu_init(void)
+{
+	unsigned int cnt;
+
+	switch (gator_cpuid()) {
+	case ARM1136:
+	case ARM1156:
+	case ARM1176:
+		pmnc_name = "ARM_ARM11";
+		pmnc_counters = 3;
+		ccnt = 2;
+		break;
+	case ARM11MPCORE:
+		pmnc_name = "ARM_ARM11MPCore";
+		pmnc_counters = 3;
+		break;
+	case CORTEX_A5:
+		pmnc_name = "ARM_Cortex-A5";
+		pmnc_counters = 2;
+		break;
+	case CORTEX_A7:
+		pmnc_name = "ARM_Cortex-A7";
+		pmnc_counters = 4;
+		break;
+	case CORTEX_A8:
+		pmnc_name = "ARM_Cortex-A8";
+		pmnc_counters = 4;
+		break;
+	case CORTEX_A9:
+		pmnc_name = "ARM_Cortex-A9";
+		pmnc_counters = 6;
+		break;
+	case CORTEX_A15:
+		pmnc_name = "ARM_Cortex-A15";
+		pmnc_counters = 6;
+		break;
+	case SCORPION:
+		pmnc_name = "Scorpion";
+		pmnc_counters = 4;
+		break;
+	case SCORPIONMP:
+		pmnc_name = "ScorpionMP";
+		pmnc_counters = 4;
+		break;
+	case KRAITSIM:
+	case KRAIT:
+		pmnc_name = "Krait";
+		pmnc_counters = 4;
+		break;
+	default:
+		return -1;
+	}
+
+	pmnc_counters++; // CNT[n] + CCNT
+
+	for (cnt = 0; cnt < CNTMAX; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+		pmnc_count[cnt] = 0;
+		pmnc_key[cnt] = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_perf_pmu_interface);
+}
+
+gator_events_init(gator_events_perf_pmu_init);
+#endif
diff --git a/drivers/gator/gator_events_sched.c b/drivers/gator/gator_events_sched.c
new file mode 100644
index 00000000000..9bed3641dbb
--- /dev/null
+++ b/drivers/gator/gator_events_sched.c
@@ -0,0 +1,114 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include "gator.h"
+#include <trace/events/sched.h>
+
+#define SCHED_SWITCH	0
+#define SCHED_TOTAL		(SCHED_SWITCH+1)
+
+static ulong sched_switch_enabled;
+static ulong sched_switch_key;
+static DEFINE_PER_CPU(int[SCHED_TOTAL], schedCnt);
+static DEFINE_PER_CPU(int[SCHED_TOTAL * 2], schedGet);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
+GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct rq *rq, struct task_struct *prev, struct task_struct *next))
+#else
+GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct task_struct *prev, struct task_struct *next))
+#endif
+{
+	unsigned long flags;
+
+	// disable interrupts to synchronize with gator_events_sched_read()
+	// spinlocks not needed since percpu buffers are used
+	local_irq_save(flags);
+	per_cpu(schedCnt, smp_processor_id())[SCHED_SWITCH]++;
+	local_irq_restore(flags);
+}
+
+static int gator_events_sched_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+
+	/* switch */
+	dir = gatorfs_mkdir(sb, root, "Linux_sched_switch");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &sched_switch_enabled);
+	gatorfs_create_ro_ulong(sb, dir, "key", &sched_switch_key);
+
+	return 0;
+}
+
+static int gator_events_sched_start(void)
+{
+	// register tracepoints
+	if (sched_switch_enabled)
+		if (GATOR_REGISTER_TRACE(sched_switch))
+			goto sched_switch_exit;
+	pr_debug("gator: registered scheduler event tracepoints\n");
+
+	return 0;
+
+	// unregister tracepoints on error
+sched_switch_exit:
+	pr_err("gator: scheduler event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
+
+	return -1;
+}
+
+static void gator_events_sched_stop(void)
+{
+	if (sched_switch_enabled)
+		GATOR_UNREGISTER_TRACE(sched_switch);
+	pr_debug("gator: unregistered scheduler event tracepoints\n");
+
+	sched_switch_enabled = 0;
+}
+
+static int gator_events_sched_read(int **buffer)
+{
+	unsigned long flags;
+	int len, value;
+	int cpu = smp_processor_id();
+
+	len = 0;
+	if (sched_switch_enabled) {
+		local_irq_save(flags);
+		value = per_cpu(schedCnt, cpu)[SCHED_SWITCH];
+		per_cpu(schedCnt, cpu)[SCHED_SWITCH] = 0;
+		local_irq_restore(flags);
+		per_cpu(schedGet, cpu)[len++] = sched_switch_key;
+		per_cpu(schedGet, cpu)[len++] = value;
+	}
+
+	if (buffer)
+		*buffer = per_cpu(schedGet, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_sched_interface = {
+	.create_files = gator_events_sched_create_files,
+	.start = gator_events_sched_start,
+	.stop = gator_events_sched_stop,
+	.read = gator_events_sched_read,
+};
+
+int gator_events_sched_init(void)
+{
+	sched_switch_enabled = 0;
+
+	sched_switch_key = gator_events_get_key();
+
+	return gator_events_install(&gator_events_sched_interface);
+}
+gator_events_init(gator_events_sched_init);
diff --git a/drivers/gator/gator_events_scorpion.c b/drivers/gator/gator_events_scorpion.c
new file mode 100644
index 00000000000..ed0d8de6b9f
--- /dev/null
+++ b/drivers/gator/gator_events_scorpion.c
@@ -0,0 +1,678 @@
+/**
+ * Copyright (C) ARM Limited 2011-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "gator.h"
+
+// gator_events_perf_pmu.c is used if perf is supported
+#if GATOR_NO_PERF_SUPPORT
+
+static const char *pmnc_name;
+static int pmnc_counters;
+
+// Per-CPU PMNC: config reg
+#define PMNC_E		(1 << 0)	/* Enable all counters */
+#define PMNC_P		(1 << 1)	/* Reset all counters */
+#define PMNC_C		(1 << 2)	/* Cycle counter reset */
+#define PMNC_D		(1 << 3)	/* CCNT counts every 64th cpu cycle */
+#define PMNC_X		(1 << 4)	/* Export to ETM */
+#define PMNC_DP		(1 << 5)	/* Disable CCNT if non-invasive debug*/
+#define	PMNC_MASK	0x3f		/* Mask for writable bits */
+
+// ccnt reg
+#define CCNT_REG	(1 << 31)
+
+#define CCNT 		0
+#define CNT0		1
+#define CNTMAX 		(4+1)
+
+static unsigned long pmnc_enabled[CNTMAX];
+static unsigned long pmnc_event[CNTMAX];
+static unsigned long pmnc_key[CNTMAX];
+
+static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt);
+
+enum scorpion_perf_types {
+	SCORPION_ICACHE_EXPL_INV                = 0x4c,
+	SCORPION_ICACHE_MISS                    = 0x4d,
+	SCORPION_ICACHE_ACCESS                  = 0x4e,
+	SCORPION_ICACHE_CACHEREQ_L2             = 0x4f,
+	SCORPION_ICACHE_NOCACHE_L2              = 0x50,
+	SCORPION_HIQUP_NOPED                    = 0x51,
+	SCORPION_DATA_ABORT                     = 0x52,
+	SCORPION_IRQ                            = 0x53,
+	SCORPION_FIQ                            = 0x54,
+	SCORPION_ALL_EXCPT                      = 0x55,
+	SCORPION_UNDEF                          = 0x56,
+	SCORPION_SVC                            = 0x57,
+	SCORPION_SMC                            = 0x58,
+	SCORPION_PREFETCH_ABORT                 = 0x59,
+	SCORPION_INDEX_CHECK                    = 0x5a,
+	SCORPION_NULL_CHECK                     = 0x5b,
+	SCORPION_EXPL_ICIALLU                   = 0x5c,
+	SCORPION_IMPL_ICIALLU                   = 0x5d,
+	SCORPION_NONICIALLU_BTAC_INV            = 0x5e,
+	SCORPION_ICIMVAU_IMPL_ICIALLU           = 0x5f,
+	SCORPION_SPIPE_ONLY_CYCLES              = 0x60,
+	SCORPION_XPIPE_ONLY_CYCLES              = 0x61,
+	SCORPION_DUAL_CYCLES                    = 0x62,
+	SCORPION_DISPATCH_ANY_CYCLES            = 0x63,
+	SCORPION_FIFO_FULLBLK_CMT               = 0x64,
+	SCORPION_FAIL_COND_INST                 = 0x65,
+	SCORPION_PASS_COND_INST                 = 0x66,
+	SCORPION_ALLOW_VU_CLK                   = 0x67,
+	SCORPION_VU_IDLE                        = 0x68,
+	SCORPION_ALLOW_L2_CLK                   = 0x69,
+	SCORPION_L2_IDLE                        = 0x6a,
+	SCORPION_DTLB_IMPL_INV_SCTLR_DACR       = 0x6b,
+	SCORPION_DTLB_EXPL_INV                  = 0x6c,
+	SCORPION_DTLB_MISS                      = 0x6d,
+	SCORPION_DTLB_ACCESS                    = 0x6e,
+	SCORPION_ITLB_MISS                      = 0x6f,
+	SCORPION_ITLB_IMPL_INV                  = 0x70,
+	SCORPION_ITLB_EXPL_INV                  = 0x71,
+	SCORPION_UTLB_D_MISS                    = 0x72,
+	SCORPION_UTLB_D_ACCESS                  = 0x73,
+	SCORPION_UTLB_I_MISS                    = 0x74,
+	SCORPION_UTLB_I_ACCESS                  = 0x75,
+	SCORPION_UTLB_INV_ASID                  = 0x76,
+	SCORPION_UTLB_INV_MVA                   = 0x77,
+	SCORPION_UTLB_INV_ALL                   = 0x78,
+	SCORPION_S2_HOLD_RDQ_UNAVAIL            = 0x79,
+	SCORPION_S2_HOLD                        = 0x7a,
+	SCORPION_S2_HOLD_DEV_OP                 = 0x7b,
+	SCORPION_S2_HOLD_ORDER                  = 0x7c,
+	SCORPION_S2_HOLD_BARRIER                = 0x7d,
+	SCORPION_VIU_DUAL_CYCLE                 = 0x7e,
+	SCORPION_VIU_SINGLE_CYCLE               = 0x7f,
+	SCORPION_VX_PIPE_WAR_STALL_CYCLES       = 0x80,
+	SCORPION_VX_PIPE_WAW_STALL_CYCLES       = 0x81,
+	SCORPION_VX_PIPE_RAW_STALL_CYCLES       = 0x82,
+	SCORPION_VX_PIPE_LOAD_USE_STALL         = 0x83,
+	SCORPION_VS_PIPE_WAR_STALL_CYCLES       = 0x84,
+	SCORPION_VS_PIPE_WAW_STALL_CYCLES       = 0x85,
+	SCORPION_VS_PIPE_RAW_STALL_CYCLES       = 0x86,
+	SCORPION_EXCEPTIONS_INV_OPERATION       = 0x87,
+	SCORPION_EXCEPTIONS_DIV_BY_ZERO         = 0x88,
+	SCORPION_COND_INST_FAIL_VX_PIPE         = 0x89,
+	SCORPION_COND_INST_FAIL_VS_PIPE         = 0x8a,
+	SCORPION_EXCEPTIONS_OVERFLOW            = 0x8b,
+	SCORPION_EXCEPTIONS_UNDERFLOW           = 0x8c,
+	SCORPION_EXCEPTIONS_DENORM              = 0x8d,
+#ifdef CONFIG_ARCH_MSM_SCORPIONMP
+	SCORPIONMP_NUM_BARRIERS                 = 0x8e,
+	SCORPIONMP_BARRIER_CYCLES               = 0x8f,
+#else
+	SCORPION_BANK_AB_HIT                    = 0x8e,
+	SCORPION_BANK_AB_ACCESS                 = 0x8f,
+	SCORPION_BANK_CD_HIT                    = 0x90,
+	SCORPION_BANK_CD_ACCESS                 = 0x91,
+	SCORPION_BANK_AB_DSIDE_HIT              = 0x92,
+	SCORPION_BANK_AB_DSIDE_ACCESS           = 0x93,
+	SCORPION_BANK_CD_DSIDE_HIT              = 0x94,
+	SCORPION_BANK_CD_DSIDE_ACCESS           = 0x95,
+	SCORPION_BANK_AB_ISIDE_HIT              = 0x96,
+	SCORPION_BANK_AB_ISIDE_ACCESS           = 0x97,
+	SCORPION_BANK_CD_ISIDE_HIT              = 0x98,
+	SCORPION_BANK_CD_ISIDE_ACCESS           = 0x99,
+	SCORPION_ISIDE_RD_WAIT                  = 0x9a,
+	SCORPION_DSIDE_RD_WAIT                  = 0x9b,
+	SCORPION_BANK_BYPASS_WRITE              = 0x9c,
+	SCORPION_BANK_AB_NON_CASTOUT            = 0x9d,
+	SCORPION_BANK_AB_L2_CASTOUT             = 0x9e,
+	SCORPION_BANK_CD_NON_CASTOUT            = 0x9f,
+	SCORPION_BANK_CD_L2_CASTOUT             = 0xa0,
+#endif
+	MSM_MAX_EVT
+};
+
+struct scorp_evt {
+	u32 evt_type;
+	u32 val;
+	u8 grp;
+	u32 evt_type_act;
+};
+
+static const struct scorp_evt sc_evt[] = {
+	{SCORPION_ICACHE_EXPL_INV, 0x80000500, 0, 0x4d},
+	{SCORPION_ICACHE_MISS, 0x80050000, 0, 0x4e},
+	{SCORPION_ICACHE_ACCESS, 0x85000000, 0, 0x4f},
+	{SCORPION_ICACHE_CACHEREQ_L2, 0x86000000, 0, 0x4f},
+	{SCORPION_ICACHE_NOCACHE_L2, 0x87000000, 0, 0x4f},
+	{SCORPION_HIQUP_NOPED, 0x80080000, 0, 0x4e},
+	{SCORPION_DATA_ABORT, 0x8000000a, 0, 0x4c},
+	{SCORPION_IRQ, 0x80000a00, 0, 0x4d},
+	{SCORPION_FIQ, 0x800a0000, 0, 0x4e},
+	{SCORPION_ALL_EXCPT, 0x8a000000, 0, 0x4f},
+	{SCORPION_UNDEF, 0x8000000b, 0, 0x4c},
+	{SCORPION_SVC, 0x80000b00, 0, 0x4d},
+	{SCORPION_SMC, 0x800b0000, 0, 0x4e},
+	{SCORPION_PREFETCH_ABORT, 0x8b000000, 0, 0x4f},
+	{SCORPION_INDEX_CHECK, 0x8000000c, 0, 0x4c},
+	{SCORPION_NULL_CHECK, 0x80000c00, 0, 0x4d},
+	{SCORPION_EXPL_ICIALLU, 0x8000000d, 0, 0x4c},
+	{SCORPION_IMPL_ICIALLU, 0x80000d00, 0, 0x4d},
+	{SCORPION_NONICIALLU_BTAC_INV, 0x800d0000, 0, 0x4e},
+	{SCORPION_ICIMVAU_IMPL_ICIALLU, 0x8d000000, 0, 0x4f},
+
+	{SCORPION_SPIPE_ONLY_CYCLES, 0x80000600, 1, 0x51},
+	{SCORPION_XPIPE_ONLY_CYCLES, 0x80060000, 1, 0x52},
+	{SCORPION_DUAL_CYCLES, 0x86000000, 1, 0x53},
+	{SCORPION_DISPATCH_ANY_CYCLES, 0x89000000, 1, 0x53},
+	{SCORPION_FIFO_FULLBLK_CMT, 0x8000000d, 1, 0x50},
+	{SCORPION_FAIL_COND_INST, 0x800d0000, 1, 0x52},
+	{SCORPION_PASS_COND_INST, 0x8d000000, 1, 0x53},
+	{SCORPION_ALLOW_VU_CLK, 0x8000000e, 1, 0x50},
+	{SCORPION_VU_IDLE, 0x80000e00, 1, 0x51},
+	{SCORPION_ALLOW_L2_CLK, 0x800e0000, 1, 0x52},
+	{SCORPION_L2_IDLE, 0x8e000000, 1, 0x53},
+
+	{SCORPION_DTLB_IMPL_INV_SCTLR_DACR, 0x80000001, 2, 0x54},
+	{SCORPION_DTLB_EXPL_INV, 0x80000100, 2, 0x55},
+	{SCORPION_DTLB_MISS, 0x80010000, 2, 0x56},
+	{SCORPION_DTLB_ACCESS, 0x81000000, 2, 0x57},
+	{SCORPION_ITLB_MISS, 0x80000200, 2, 0x55},
+	{SCORPION_ITLB_IMPL_INV, 0x80020000, 2, 0x56},
+	{SCORPION_ITLB_EXPL_INV, 0x82000000, 2, 0x57},
+	{SCORPION_UTLB_D_MISS, 0x80000003, 2, 0x54},
+	{SCORPION_UTLB_D_ACCESS, 0x80000300, 2, 0x55},
+	{SCORPION_UTLB_I_MISS, 0x80030000, 2, 0x56},
+	{SCORPION_UTLB_I_ACCESS, 0x83000000, 2, 0x57},
+	{SCORPION_UTLB_INV_ASID, 0x80000400, 2, 0x55},
+	{SCORPION_UTLB_INV_MVA, 0x80040000, 2, 0x56},
+	{SCORPION_UTLB_INV_ALL, 0x84000000, 2, 0x57},
+	{SCORPION_S2_HOLD_RDQ_UNAVAIL, 0x80000800, 2, 0x55},
+	{SCORPION_S2_HOLD, 0x88000000, 2, 0x57},
+	{SCORPION_S2_HOLD_DEV_OP, 0x80000900, 2, 0x55},
+	{SCORPION_S2_HOLD_ORDER, 0x80090000, 2, 0x56},
+	{SCORPION_S2_HOLD_BARRIER, 0x89000000, 2, 0x57},
+
+	{SCORPION_VIU_DUAL_CYCLE, 0x80000001, 4, 0x5c},
+	{SCORPION_VIU_SINGLE_CYCLE, 0x80000100, 4, 0x5d},
+	{SCORPION_VX_PIPE_WAR_STALL_CYCLES, 0x80000005, 4, 0x5c},
+	{SCORPION_VX_PIPE_WAW_STALL_CYCLES, 0x80000500, 4, 0x5d},
+	{SCORPION_VX_PIPE_RAW_STALL_CYCLES, 0x80050000, 4, 0x5e},
+	{SCORPION_VX_PIPE_LOAD_USE_STALL, 0x80000007, 4, 0x5c},
+	{SCORPION_VS_PIPE_WAR_STALL_CYCLES, 0x80000008, 4, 0x5c},
+	{SCORPION_VS_PIPE_WAW_STALL_CYCLES, 0x80000800, 4, 0x5d},
+	{SCORPION_VS_PIPE_RAW_STALL_CYCLES, 0x80080000, 4, 0x5e},
+	{SCORPION_EXCEPTIONS_INV_OPERATION, 0x8000000b, 4, 0x5c},
+	{SCORPION_EXCEPTIONS_DIV_BY_ZERO, 0x80000b00, 4, 0x5d},
+	{SCORPION_COND_INST_FAIL_VX_PIPE, 0x800b0000, 4, 0x5e},
+	{SCORPION_COND_INST_FAIL_VS_PIPE, 0x8b000000, 4, 0x5f},
+	{SCORPION_EXCEPTIONS_OVERFLOW, 0x8000000c, 4, 0x5c},
+	{SCORPION_EXCEPTIONS_UNDERFLOW, 0x80000c00, 4, 0x5d},
+	{SCORPION_EXCEPTIONS_DENORM, 0x8c000000, 4, 0x5f},
+
+#ifdef CONFIG_ARCH_MSM_SCORPIONMP
+    {SCORPIONMP_NUM_BARRIERS, 0x80000e00, 3, 0x59},
+    {SCORPIONMP_BARRIER_CYCLES, 0x800e0000, 3, 0x5a},
+#else
+	{SCORPION_BANK_AB_HIT, 0x80000001, 3, 0x58},
+	{SCORPION_BANK_AB_ACCESS, 0x80000100, 3, 0x59},
+	{SCORPION_BANK_CD_HIT, 0x80010000, 3, 0x5a},
+	{SCORPION_BANK_CD_ACCESS, 0x81000000, 3, 0x5b},
+	{SCORPION_BANK_AB_DSIDE_HIT, 0x80000002, 3, 0x58},
+	{SCORPION_BANK_AB_DSIDE_ACCESS, 0x80000200, 3, 0x59},
+	{SCORPION_BANK_CD_DSIDE_HIT, 0x80020000, 3, 0x5a},
+	{SCORPION_BANK_CD_DSIDE_ACCESS, 0x82000000, 3, 0x5b},
+	{SCORPION_BANK_AB_ISIDE_HIT, 0x80000003, 3, 0x58},
+	{SCORPION_BANK_AB_ISIDE_ACCESS, 0x80000300, 3, 0x59},
+	{SCORPION_BANK_CD_ISIDE_HIT, 0x80030000, 3, 0x5a},
+	{SCORPION_BANK_CD_ISIDE_ACCESS, 0x83000000, 3, 0x5b},
+	{SCORPION_ISIDE_RD_WAIT, 0x80000009, 3, 0x58},
+	{SCORPION_DSIDE_RD_WAIT, 0x80090000, 3, 0x5a},
+	{SCORPION_BANK_BYPASS_WRITE, 0x8000000a, 3, 0x58},
+	{SCORPION_BANK_AB_NON_CASTOUT, 0x8000000c, 3, 0x58},
+	{SCORPION_BANK_AB_L2_CASTOUT, 0x80000c00, 3, 0x59},
+	{SCORPION_BANK_CD_NON_CASTOUT, 0x800c0000, 3, 0x5a},
+	{SCORPION_BANK_CD_L2_CASTOUT, 0x8c000000, 3, 0x5b},
+#endif
+};
+
+static inline void scorpion_pmnc_write(u32 val)
+{
+	val &= PMNC_MASK;
+	asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r" (val));
+}
+
+static inline u32 scorpion_pmnc_read(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
+	return val;
+}
+
+static inline u32 scorpion_ccnt_read(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
+	return val;
+}
+
+static inline u32 scorpion_cntn_read(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val));
+	return val;
+}
+
+static inline u32 scorpion_pmnc_enable_counter(unsigned int cnt)
+{
+	u32 val;
+
+	if (cnt >= CNTMAX) {
+		pr_err("gator: CPU%u enabling wrong PMNC counter %d\n", smp_processor_id(), cnt);
+		return -1;
+	}
+
+	if (cnt == CCNT)
+		val = CCNT_REG;
+	else
+		val = (1 << (cnt - CNT0));
+
+	asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));
+
+	return cnt;
+}
+
+static inline u32 scorpion_pmnc_disable_counter(unsigned int cnt)
+{
+	u32 val;
+
+	if (cnt >= CNTMAX) {
+		pr_err("gator: CPU%u disabling wrong PMNC counter %d\n", smp_processor_id(), cnt);
+		return -1;
+	}
+
+	if (cnt == CCNT)
+		val = CCNT_REG;
+	else
+		val = (1 << (cnt - CNT0));
+
+	asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));
+
+	return cnt;
+}
+
+static inline int scorpion_pmnc_select_counter(unsigned int cnt)
+{
+	u32 val;
+
+	if ((cnt == CCNT) || (cnt >= CNTMAX)) {
+		pr_err("gator: CPU%u selecting wrong PMNC counter %d\n", smp_processor_id(), cnt);
+		return -1;
+	}
+
+	val = (cnt - CNT0);
+	asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));
+
+	return cnt;
+}
+
+static u32 scorpion_read_lpm0(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c15, c0, 0" : "=r" (val));
+	return val;
+}
+
+static void scorpion_write_lpm0(u32 val)
+{
+	asm volatile("mcr p15, 0, %0, c15, c0, 0" : : "r" (val));
+}
+
+static u32 scorpion_read_lpm1(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 1, %0, c15, c0, 0" : "=r" (val));
+	return val;
+}
+
+static void scorpion_write_lpm1(u32 val)
+{
+	asm volatile("mcr p15, 1, %0, c15, c0, 0" : : "r" (val));
+}
+
+static u32 scorpion_read_lpm2(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 2, %0, c15, c0, 0" : "=r" (val));
+	return val;
+}
+
+static void scorpion_write_lpm2(u32 val)
+{
+	asm volatile("mcr p15, 2, %0, c15, c0, 0" : : "r" (val));
+}
+
+static u32 scorpion_read_l2lpm(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 3, %0, c15, c2, 0" : "=r" (val));
+	return val;
+}
+
+static void scorpion_write_l2lpm(u32 val)
+{
+	asm volatile("mcr p15, 3, %0, c15, c2, 0" : : "r" (val));
+}
+
+static u32 scorpion_read_vlpm(void)
+{
+	u32 val;
+	asm volatile("mrc p10, 7, %0, c11, c0, 0" : "=r" (val));
+	return val;
+}
+
+static void scorpion_write_vlpm(u32 val)
+{
+	asm volatile("mcr p10, 7, %0, c11, c0, 0" : : "r" (val));
+}
+
+struct scorpion_access_funcs {
+	u32 (*read) (void);
+	void (*write) (u32);
+};
+
+struct scorpion_access_funcs scor_func[] = {
+	{scorpion_read_lpm0, scorpion_write_lpm0},
+	{scorpion_read_lpm1, scorpion_write_lpm1},
+	{scorpion_read_lpm2, scorpion_write_lpm2},
+	{scorpion_read_l2lpm, scorpion_write_l2lpm},
+	{scorpion_read_vlpm, scorpion_write_vlpm},
+};
+
+u32 venum_orig_val;
+u32 fp_orig_val;
+
+static void scorpion_pre_vlpm(void)
+{
+	u32 venum_new_val;
+	u32 fp_new_val;
+
+	/* CPACR Enable CP10 access*/
+	asm volatile("mrc p15, 0, %0, c1, c0, 2" : "=r" (venum_orig_val));
+	venum_new_val = venum_orig_val | 0x00300000;
+	asm volatile("mcr p15, 0, %0, c1, c0, 2" : : "r" (venum_new_val));
+	/* Enable FPEXC */
+	asm volatile("mrc p10, 7, %0, c8, c0, 0" : "=r" (fp_orig_val));
+	fp_new_val = fp_orig_val | 0x40000000;
+	asm volatile("mcr p10, 7, %0, c8, c0, 0" : : "r" (fp_new_val));
+}
+
+static void scorpion_post_vlpm(void)
+{
+	/* Restore FPEXC*/
+	asm volatile("mcr p10, 7, %0, c8, c0, 0" : : "r" (fp_orig_val));
+	/* Restore CPACR*/
+	asm volatile("mcr p15, 0, %0, c1, c0, 2" : : "r" (venum_orig_val));
+}
+
+#define COLMN0MASK 0x000000ff
+#define COLMN1MASK 0x0000ff00
+#define COLMN2MASK 0x00ff0000
+static u32 scorpion_get_columnmask(u32 setval)
+{
+	if (setval & COLMN0MASK)
+		return 0xffffff00;
+	else if (setval & COLMN1MASK)
+		return 0xffff00ff;
+	else if (setval & COLMN2MASK)
+		return 0xff00ffff;
+	else
+		return 0x80ffffff;
+}
+
+static void scorpion_evt_setup(u32 gr, u32 setval)
+{
+	u32 val;
+	if (gr == 4)
+		scorpion_pre_vlpm();
+	val = scorpion_get_columnmask(setval) & scor_func[gr].read();
+	val = val | setval;
+	scor_func[gr].write(val);
+	if (gr == 4)
+		scorpion_post_vlpm();
+}
+
+static int get_scorpion_evtinfo(unsigned int evt_type, struct scorp_evt *evtinfo)
+{
+	u32 idx;
+	if ((evt_type < 0x4c) || (evt_type >= MSM_MAX_EVT))
+		return 0;
+	idx = evt_type - 0x4c;
+	if (sc_evt[idx].evt_type == evt_type) {
+		evtinfo->val = sc_evt[idx].val;
+		evtinfo->grp = sc_evt[idx].grp;
+		evtinfo->evt_type_act = sc_evt[idx].evt_type_act;
+		return 1;
+	}
+	return 0;
+}
+
+static inline void scorpion_pmnc_write_evtsel(unsigned int cnt, u32 val)
+{
+	if (scorpion_pmnc_select_counter(cnt) == cnt) {
+		if (val < 0x40) {
+			asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
+		} else {
+			u32 zero = 0;
+			struct scorp_evt evtinfo;
+			// extract evtinfo.grp and evtinfo.tevt_type_act from val
+			if (get_scorpion_evtinfo(val, &evtinfo) == 0) return;
+			asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (evtinfo.evt_type_act));
+			asm volatile("mcr p15, 0, %0, c9, c15, 0" : : "r" (zero));
+			scorpion_evt_setup(evtinfo.grp, val);
+		}
+	}
+}
+
+static void scorpion_pmnc_reset_counter(unsigned int cnt)
+{
+	u32 val = 0;
+
+	if (cnt == CCNT) {
+		scorpion_pmnc_disable_counter(cnt);
+
+		asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (val));
+
+		if (pmnc_enabled[cnt] != 0)
+		    scorpion_pmnc_enable_counter(cnt);
+
+	} else if (cnt >= CNTMAX) {
+		pr_err("gator: CPU%u resetting wrong PMNC counter %d\n", smp_processor_id(), cnt);
+	} else {
+		scorpion_pmnc_disable_counter(cnt);
+
+		if (scorpion_pmnc_select_counter(cnt) == cnt)
+		    asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (val));
+
+		if (pmnc_enabled[cnt] != 0)
+		    scorpion_pmnc_enable_counter(cnt);
+	}
+}
+
+static int gator_events_scorpion_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	int i;
+
+	for (i = 0; i < pmnc_counters; i++) {
+		char buf[40];
+		if (i == 0) {
+			snprintf(buf, sizeof buf, "%s_ccnt", pmnc_name);
+		} else {
+			snprintf(buf, sizeof buf, "%s_cnt%d", pmnc_name, i-1);
+		}
+		dir = gatorfs_mkdir(sb, root, buf);
+		if (!dir) {
+			return -1;
+		}
+		gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
+		gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);		
+		if (i > 0) {
+			gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int gator_events_scorpion_online(int** buffer)
+{
+	unsigned int cnt, len = 0, cpu = smp_processor_id();
+
+	if (scorpion_pmnc_read() & PMNC_E) {
+		scorpion_pmnc_write(scorpion_pmnc_read() & ~PMNC_E);
+	}
+
+	/* Initialize & Reset PMNC: C bit and P bit */
+	scorpion_pmnc_write(PMNC_P | PMNC_C);
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		unsigned long event;
+
+		if (!pmnc_enabled[cnt])
+			continue;
+
+		// disable counter
+		scorpion_pmnc_disable_counter(cnt);
+
+		event = pmnc_event[cnt] & 255;
+
+		// Set event (if destined for PMNx counters), We don't need to set the event if it's a cycle count
+		if (cnt != CCNT)
+			scorpion_pmnc_write_evtsel(cnt, event);
+
+		// reset counter
+		scorpion_pmnc_reset_counter(cnt);
+
+		// Enable counter, do not enable interrupt for this counter
+		scorpion_pmnc_enable_counter(cnt);
+	}
+
+	// enable
+	scorpion_pmnc_write(scorpion_pmnc_read() | PMNC_E);
+
+	// read the counters and toss the invalid data, return zero instead
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			int value;
+			if (cnt == CCNT) {
+				value = scorpion_ccnt_read();
+			} else if (scorpion_pmnc_select_counter(cnt) == cnt) {
+				value = scorpion_cntn_read();
+			} else {
+				value = 0;
+			}
+			scorpion_pmnc_reset_counter(cnt);
+
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = 0;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static int gator_events_scorpion_offline(int** buffer)
+{
+	scorpion_pmnc_write(scorpion_pmnc_read() & ~PMNC_E);
+	return 0;
+}
+
+static void gator_events_scorpion_stop(void)
+{
+	unsigned int cnt;
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+	}
+}
+
+static int gator_events_scorpion_read(int **buffer)
+{
+	int cnt, len = 0;
+	int cpu = smp_processor_id();
+
+	// a context switch may occur before the online hotplug event, thus need to check that the pmu is enabled
+	if (!(scorpion_pmnc_read() & PMNC_E)) {
+		return 0;
+	}
+
+	for (cnt = 0; cnt < pmnc_counters; cnt++) {
+		if (pmnc_enabled[cnt]) {
+			int value;
+			if (cnt == CCNT) {
+				value = scorpion_ccnt_read();
+			} else if (scorpion_pmnc_select_counter(cnt) == cnt) {
+				value = scorpion_cntn_read();
+			} else {
+				value = 0;
+			}
+			scorpion_pmnc_reset_counter(cnt);
+
+			per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
+			per_cpu(perfCnt, cpu)[len++] = value;
+		}
+	}
+
+	if (buffer)
+		*buffer = per_cpu(perfCnt, cpu);
+
+	return len;
+}
+
+static struct gator_interface gator_events_scorpion_interface = {
+	.create_files = gator_events_scorpion_create_files,
+	.stop = gator_events_scorpion_stop,
+	.online = gator_events_scorpion_online,
+	.offline = gator_events_scorpion_offline,
+	.read = gator_events_scorpion_read,
+};
+
+int gator_events_scorpion_init(void)
+{
+	unsigned int cnt;
+
+	switch (gator_cpuid()) {
+	case SCORPION:
+		pmnc_name = "Scorpion";
+		pmnc_counters = 4;
+		break;
+	case SCORPIONMP:
+		pmnc_name = "ScorpionMP";
+		pmnc_counters = 4;
+		break;
+	default:
+		return -1;
+	}
+
+	pmnc_counters++; // CNT[n] + CCNT
+
+	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
+		pmnc_enabled[cnt] = 0;
+		pmnc_event[cnt] = 0;
+		pmnc_key[cnt] = gator_events_get_key();
+	}
+
+	return gator_events_install(&gator_events_scorpion_interface);
+}
+
+gator_events_init(gator_events_scorpion_init);
+
+#else
+int gator_events_scorpion_init(void)
+{
+	return -1;
+}
+#endif
diff --git a/drivers/gator/gator_fs.c b/drivers/gator/gator_fs.c
new file mode 100644
index 00000000000..39adfbecd06
--- /dev/null
+++ b/drivers/gator/gator_fs.c
@@ -0,0 +1,292 @@
+/**
+ * @file gatorfs.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon
+ *
+ * A simple filesystem for configuration and
+ * access of oprofile.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <asm/uaccess.h>
+
+#define gatorfs_MAGIC 0x24051020
+#define TMPBUFSIZE 50
+DEFINE_SPINLOCK(gatorfs_lock);
+
+static struct inode *gatorfs_get_inode(struct super_block *sb, int mode)
+{
+	struct inode *inode = new_inode(sb);
+
+	if (inode) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
+		inode->i_ino = get_next_ino();
+#endif
+		inode->i_mode = mode;
+		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	}
+	return inode;
+}
+
+static const struct super_operations s_ops = {
+	.statfs		= simple_statfs,
+	.drop_inode 	= generic_delete_inode,
+};
+
+ssize_t gatorfs_str_to_user(char const *str, char __user *buf, size_t count, loff_t *offset)
+{
+	return simple_read_from_buffer(buf, count, offset, str, strlen(str));
+}
+
+ssize_t gatorfs_ulong_to_user(unsigned long val, char __user *buf, size_t count, loff_t *offset)
+{
+	char tmpbuf[TMPBUFSIZE];
+	size_t maxlen = snprintf(tmpbuf, TMPBUFSIZE, "%lu\n", val);
+	if (maxlen > TMPBUFSIZE)
+		maxlen = TMPBUFSIZE;
+	return simple_read_from_buffer(buf, count, offset, tmpbuf, maxlen);
+}
+
+int gatorfs_ulong_from_user(unsigned long *val, char const __user *buf, size_t count)
+{
+	char tmpbuf[TMPBUFSIZE];
+	unsigned long flags;
+
+	if (!count)
+		return 0;
+
+	if (count > TMPBUFSIZE - 1)
+		return -EINVAL;
+
+	memset(tmpbuf, 0x0, TMPBUFSIZE);
+
+	if (copy_from_user(tmpbuf, buf, count))
+		return -EFAULT;
+
+	spin_lock_irqsave(&gatorfs_lock, flags);
+	*val = simple_strtoul(tmpbuf, NULL, 0);
+	spin_unlock_irqrestore(&gatorfs_lock, flags);
+	return 0;
+}
+
+static ssize_t ulong_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long *val = file->private_data;
+	return gatorfs_ulong_to_user(*val, buf, count, offset);
+}
+
+static ssize_t ulong_write_file(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long *value = file->private_data;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	retval = gatorfs_ulong_from_user(value, buf, count);
+
+	if (retval)
+		return retval;
+	return count;
+}
+
+static int default_open(struct inode *inode, struct file *filp)
+{
+	if (inode->i_private)
+		filp->private_data = inode->i_private;
+	return 0;
+}
+
+static const struct file_operations ulong_fops = {
+	.read		= ulong_read_file,
+	.write		= ulong_write_file,
+	.open		= default_open,
+};
+
+static const struct file_operations ulong_ro_fops = {
+	.read		= ulong_read_file,
+	.open		= default_open,
+};
+
+static struct dentry *__gatorfs_create_file(struct super_block *sb,
+	struct dentry *root, char const *name, const struct file_operations *fops,
+	int perm)
+{
+	struct dentry *dentry;
+	struct inode *inode;
+
+	dentry = d_alloc_name(root, name);
+	if (!dentry)
+		return NULL;
+	inode = gatorfs_get_inode(sb, S_IFREG | perm);
+	if (!inode) {
+		dput(dentry);
+		return NULL;
+	}
+	inode->i_fop = fops;
+	d_add(dentry, inode);
+	return dentry;
+}
+
+int gatorfs_create_ulong(struct super_block *sb, struct dentry *root,
+	char const *name, unsigned long *val)
+{
+	struct dentry *d = __gatorfs_create_file(sb, root, name,
+						     &ulong_fops, 0644);
+	if (!d)
+		return -EFAULT;
+
+	d->d_inode->i_private = val;
+	return 0;
+}
+
+int gatorfs_create_ro_ulong(struct super_block *sb, struct dentry *root,
+	char const *name, unsigned long *val)
+{
+	struct dentry *d = __gatorfs_create_file(sb, root, name,
+						     &ulong_ro_fops, 0444);
+	if (!d)
+		return -EFAULT;
+
+	d->d_inode->i_private = val;
+	return 0;
+}
+
+static ssize_t atomic_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	atomic_t *val = file->private_data;
+	return gatorfs_ulong_to_user(atomic_read(val), buf, count, offset);
+}
+
+static const struct file_operations atomic_ro_fops = {
+	.read		= atomic_read_file,
+	.open		= default_open,
+};
+
+int gatorfs_create_ro_atomic(struct super_block *sb, struct dentry *root,
+	char const *name, atomic_t *val)
+{
+	struct dentry *d = __gatorfs_create_file(sb, root, name,
+						     &atomic_ro_fops, 0444);
+	if (!d)
+		return -EFAULT;
+
+	d->d_inode->i_private = val;
+	return 0;
+}
+
+int gatorfs_create_file(struct super_block *sb, struct dentry *root,
+	char const *name, const struct file_operations *fops)
+{
+	if (!__gatorfs_create_file(sb, root, name, fops, 0644))
+		return -EFAULT;
+	return 0;
+}
+
+int gatorfs_create_file_perm(struct super_block *sb, struct dentry *root,
+	char const *name, const struct file_operations *fops, int perm)
+{
+	if (!__gatorfs_create_file(sb, root, name, fops, perm))
+		return -EFAULT;
+	return 0;
+}
+
+struct dentry *gatorfs_mkdir(struct super_block *sb,
+	struct dentry *root, char const *name)
+{
+	struct dentry *dentry;
+	struct inode *inode;
+
+	dentry = d_alloc_name(root, name);
+	if (!dentry)
+		return NULL;
+	inode = gatorfs_get_inode(sb, S_IFDIR | 0755);
+	if (!inode) {
+		dput(dentry);
+		return NULL;
+	}
+	inode->i_op = &simple_dir_inode_operations;
+	inode->i_fop = &simple_dir_operations;
+	d_add(dentry, inode);
+	return dentry;
+}
+
+static int gatorfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *root_inode;
+	struct dentry *root_dentry;
+
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+	sb->s_magic = gatorfs_MAGIC;
+	sb->s_op = &s_ops;
+	sb->s_time_gran = 1;
+
+	root_inode = gatorfs_get_inode(sb, S_IFDIR | 0755);
+	if (!root_inode)
+		return -ENOMEM;
+	root_inode->i_op = &simple_dir_inode_operations;
+	root_inode->i_fop = &simple_dir_operations;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
+	root_dentry = d_alloc_root(root_inode);
+#else
+	root_dentry = d_make_root(root_inode);
+#endif
+
+	if (!root_dentry) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
+		iput(root_inode);
+#endif
+		return -ENOMEM;
+	}
+
+	sb->s_root = root_dentry;
+
+	gator_op_create_files(sb, root_dentry);
+
+	// FIXME: verify kill_litter_super removes our dentries
+	return 0;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)
+static int gatorfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+{
+	return get_sb_single(fs_type, flags, data, gatorfs_fill_super, mnt);
+}
+#else
+static struct dentry *gatorfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_nodev(fs_type, flags, data, gatorfs_fill_super);
+}
+#endif
+
+static struct file_system_type gatorfs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "gatorfs",
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)
+	 	.get_sb		= gatorfs_get_sb,
+#else
+	 	.mount		= gatorfs_mount,
+#endif
+
+	.kill_sb	= kill_litter_super,
+};
+
+int __init gatorfs_register(void)
+{
+	return register_filesystem(&gatorfs_type);
+}
+
+void gatorfs_unregister(void)
+{
+	unregister_filesystem(&gatorfs_type);
+}
diff --git a/drivers/gator/gator_hrtimer_gator.c b/drivers/gator/gator_hrtimer_gator.c
new file mode 100755
index 00000000000..846fba44cff
--- /dev/null
+++ b/drivers/gator/gator_hrtimer_gator.c
@@ -0,0 +1,97 @@
+/**
+ * Copyright (C) ARM Limited 2011-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+// gator_hrtimer_perf.c is used if perf is supported
+//   update, gator_hrtimer_gator.c always used until issues resolved with perf hrtimers
+#if 1
+
+void (*callback)(void);
+DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
+DEFINE_PER_CPU(int, hrtimer_is_active);
+static ktime_t profiling_interval;
+static void gator_hrtimer_online(int cpu);
+static void gator_hrtimer_offline(int cpu);
+
+static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
+{
+	hrtimer_forward_now(hrtimer, profiling_interval);
+	(*callback)();
+	return HRTIMER_RESTART;
+}
+
+static void gator_hrtimer_switch_cpus_online(void *unused)
+{
+	gator_hrtimer_online(smp_processor_id());
+}
+
+static void gator_hrtimer_online(int cpu)
+{
+	struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
+
+	if (cpu != smp_processor_id()) {
+		smp_call_function_single(cpu, gator_hrtimer_switch_cpus_online, NULL, 1);
+		return;
+	}
+
+	if (per_cpu(hrtimer_is_active, cpu) || profiling_interval.tv64 == 0)
+		return;
+
+	per_cpu(hrtimer_is_active, cpu) = 1;
+	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hrtimer->function = gator_hrtimer_notify;
+	hrtimer_start(hrtimer, profiling_interval, HRTIMER_MODE_REL_PINNED);
+}
+
+static void gator_hrtimer_switch_cpus_offline(void *unused)
+{
+	gator_hrtimer_offline(smp_processor_id());
+}
+
+static void gator_hrtimer_offline(int cpu)
+{
+	struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
+
+	if (cpu != smp_processor_id()) {
+		smp_call_function_single(cpu, gator_hrtimer_switch_cpus_offline, NULL, 1);
+		return;
+	}
+
+	if (!per_cpu(hrtimer_is_active, cpu))
+		return;
+
+	per_cpu(hrtimer_is_active, cpu) = 0;
+	hrtimer_cancel(hrtimer);
+}
+
+static int gator_hrtimer_init(int interval, void (*func)(void))
+{
+	int cpu;
+
+	(callback) = (func);
+
+	for_each_present_cpu(cpu) {
+		per_cpu(hrtimer_is_active, cpu) = 0;
+	}
+
+	// calculate profiling interval
+	if (interval > 0) {
+		profiling_interval = ns_to_ktime(1000000000UL / interval);
+	} else {
+		profiling_interval.tv64 = 0;
+	}
+
+	return 0;
+}
+
+static void gator_hrtimer_shutdown(void)
+{
+	/* empty */
+}
+
+#endif
diff --git a/drivers/gator/gator_hrtimer_perf.c b/drivers/gator/gator_hrtimer_perf.c
new file mode 100755
index 00000000000..7c0333f6445
--- /dev/null
+++ b/drivers/gator/gator_hrtimer_perf.c
@@ -0,0 +1,113 @@
+/**
+ * Copyright (C) ARM Limited 2011-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+// gator_hrtimer_gator.c is used if perf is not supported
+//   update, gator_hrtimer_gator.c always used until issues resolved with perf hrtimers
+#if 0
+
+// Note: perf Cortex support added in 2.6.35 and PERF_COUNT_SW_CPU_CLOCK/hrtimer broken on 2.6.35 and 2.6.36
+//       not relevant as this code is not active until 3.0.0, but wanted to document the issue
+
+void (*callback)(void);
+static int profiling_interval;
+static DEFINE_PER_CPU(struct perf_event *, perf_hrtimer);
+static DEFINE_PER_CPU(struct perf_event_attr *, perf_hrtimer_attr);
+
+static void gator_hrtimer_shutdown(void);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+static void hrtimer_overflow_handler(struct perf_event *event, int unused, struct perf_sample_data *data, struct pt_regs *regs)
+#else
+static void hrtimer_overflow_handler(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs)
+#endif
+{
+	(*callback)();
+}
+
+static int gator_online_single_hrtimer(int cpu)
+{
+	if (per_cpu(perf_hrtimer, cpu) != 0 || per_cpu(perf_hrtimer_attr, cpu) == 0)
+		return 0;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0)
+	per_cpu(perf_hrtimer, cpu) = perf_event_create_kernel_counter(per_cpu(perf_hrtimer_attr, cpu), cpu, 0, hrtimer_overflow_handler);
+#else
+	per_cpu(perf_hrtimer, cpu) = perf_event_create_kernel_counter(per_cpu(perf_hrtimer_attr, cpu), cpu, 0, hrtimer_overflow_handler, 0);
+#endif
+	if (IS_ERR(per_cpu(perf_hrtimer, cpu))) {
+		per_cpu(perf_hrtimer, cpu) = NULL;
+		return -1;
+	}
+
+	if (per_cpu(perf_hrtimer, cpu)->state != PERF_EVENT_STATE_ACTIVE) {
+		perf_event_release_kernel(per_cpu(perf_hrtimer, cpu));
+		per_cpu(perf_hrtimer, cpu) = NULL;
+		return -1;
+	}
+
+	return 0;
+}
+
+static void gator_hrtimer_online(int cpu)
+{
+	if (gator_online_single_hrtimer(cpu) < 0) {
+		pr_debug("gator: unable to online the hrtimer on cpu%d\n", cpu);
+	}
+}
+
+static void gator_hrtimer_offline(int cpu)
+{
+	if (per_cpu(perf_hrtimer, cpu)) {
+		perf_event_release_kernel(per_cpu(perf_hrtimer, cpu));
+		per_cpu(perf_hrtimer, cpu) = NULL;
+	}
+}
+
+static int gator_hrtimer_init(int interval, void (*func)(void))
+{
+	u32 size = sizeof(struct perf_event_attr);
+	int cpu;
+
+	callback = func;
+
+	// calculate profiling interval
+	profiling_interval = 1000000000 / interval;
+
+	for_each_present_cpu(cpu) {
+		per_cpu(perf_hrtimer, cpu) = 0;
+		per_cpu(perf_hrtimer_attr, cpu) = kmalloc(size, GFP_KERNEL);
+		if (per_cpu(perf_hrtimer_attr, cpu) == 0) {
+			gator_hrtimer_shutdown();
+			return -1;
+		}
+
+		memset(per_cpu(perf_hrtimer_attr, cpu), 0, size);
+		per_cpu(perf_hrtimer_attr, cpu)->type = PERF_TYPE_SOFTWARE;
+		per_cpu(perf_hrtimer_attr, cpu)->size = size;
+		per_cpu(perf_hrtimer_attr, cpu)->config = PERF_COUNT_SW_CPU_CLOCK;
+		per_cpu(perf_hrtimer_attr, cpu)->sample_period = profiling_interval;
+		per_cpu(perf_hrtimer_attr, cpu)->pinned = 1;
+	}
+
+	return 0;
+}
+
+static void gator_hrtimer_shutdown(void)
+{
+	int cpu;
+
+	for_each_present_cpu(cpu) {
+		if (per_cpu(perf_hrtimer_attr, cpu)) {
+			kfree(per_cpu(perf_hrtimer_attr, cpu));
+			per_cpu(perf_hrtimer_attr, cpu) = NULL;
+		}
+	}
+}
+
+#endif
diff --git a/drivers/gator/gator_main.c b/drivers/gator/gator_main.c
new file mode 100644
index 00000000000..988045f187d
--- /dev/null
+++ b/drivers/gator/gator_main.c
@@ -0,0 +1,1086 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+static unsigned long gator_protocol_version = 9;
+
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <linux/sched.h>
+#include <linux/irq.h>
+#include <linux/vmalloc.h>
+#include <linux/hardirq.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/perf_event.h>
+#include <asm/stacktrace.h>
+#include <asm/uaccess.h>
+
+#include "gator.h"
+#include "gator_events.h"
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
+#error kernels prior to 2.6.32 are not supported
+#endif
+
+#if !defined(CONFIG_GENERIC_TRACER) && !defined(CONFIG_TRACING)
+#error gator requires the kernel to have CONFIG_GENERIC_TRACER or CONFIG_TRACING defined
+#endif
+
+#ifndef CONFIG_PROFILING
+#error gator requires the kernel to have CONFIG_PROFILING defined
+#endif
+
+#ifndef CONFIG_HIGH_RES_TIMERS
+#error gator requires the kernel to have CONFIG_HIGH_RES_TIMERS defined to support PC sampling
+#endif
+
+#if defined(__arm__) && defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)
+#error gator requires the kernel to have CONFIG_LOCAL_TIMERS defined on SMP systems
+#endif
+
+#if (GATOR_PERF_SUPPORT) && (!(GATOR_PERF_PMU_SUPPORT))
+#ifndef CONFIG_PERF_EVENTS
+#warning gator requires the kernel to have CONFIG_PERF_EVENTS defined to support pmu hardware counters
+#elif !defined CONFIG_HW_PERF_EVENTS
+#warning gator requires the kernel to have CONFIG_HW_PERF_EVENTS defined to support pmu hardware counters
+#endif
+#endif
+
+/******************************************************************************
+ * DEFINES
+ ******************************************************************************/
+#define BACKTRACE_BUFFER_SIZE    (128*1024)
+#define COUNTER_BUFFER_SIZE      (128*1024)
+#define ANNOTATE_BUFFER_SIZE     (64*1024) // annotate  counters have the core as part of the data and the core value in the frame header may be discarded
+#define SCHED_TRACE_BUFFER_SIZE  (128*1024)
+#define GPU_TRACE_BUFFER_SIZE    (64*1024)
+#define COUNTER2_BUFFER_SIZE     (64*1024) // counters2 counters have the core as part of the data and the core value in the frame header may be discarded
+#define WFI_BUFFER_SIZE          (32*1024) // wfi       counters have the core as part of the data and the core value in the frame header may be discarded
+
+#define NO_COOKIE				0UL
+#define INVALID_COOKIE			~0UL
+
+#define FRAME_BACKTRACE     1
+#define FRAME_COUNTER       2
+#define FRAME_ANNOTATE      3
+#define FRAME_SCHED_TRACE   4
+#define FRAME_GPU_TRACE     5
+#define FRAME_COUNTER2      6
+#define FRAME_WFI           7
+
+#define MESSAGE_COOKIE              1
+#define MESSAGE_START_BACKTRACE     5
+#define MESSAGE_END_BACKTRACE       7
+#define MESSAGE_SUMMARY             9
+#define MESSAGE_PID_NAME            11
+
+#define MAXSIZE_PACK32		5
+#define MAXSIZE_PACK64		9
+
+#if defined(__arm__)
+#define PC_REG regs->ARM_pc
+#else
+#define PC_REG regs->ip
+#endif
+
+enum {BACKTRACE_BUF, COUNTER_BUF, SCHED_TRACE_BUF, GPU_TRACE_BUF, ANNOTATE_BUF, COUNTER2_BUF, WFI_BUF, NUM_GATOR_BUFS};
+
+/******************************************************************************
+ * Globals
+ ******************************************************************************/
+static unsigned long gator_cpu_cores;
+static unsigned long userspace_buffer_size;
+static unsigned long gator_backtrace_depth;
+
+static unsigned long gator_started;
+static unsigned long gator_buffer_opened;
+static unsigned long gator_timer_count;
+static unsigned long gator_response_type;
+static DEFINE_MUTEX(start_mutex);
+static DEFINE_MUTEX(gator_buffer_mutex);
+
+bool event_based_sampling;
+
+static DECLARE_WAIT_QUEUE_HEAD(gator_buffer_wait);
+static LIST_HEAD(gator_events);
+
+/******************************************************************************
+ * Prototypes
+ ******************************************************************************/
+static void buffer_check(int cpu, int buftype);
+static int buffer_bytes_available(int cpu, int buftype);
+static bool buffer_check_space(int cpu, int buftype, int bytes);
+static int contiguous_space_available(int cpu, int bufytpe);
+static void gator_buffer_write_packed_int(int cpu, int buftype, unsigned int x);
+static void gator_buffer_write_packed_int64(int cpu, int buftype, unsigned long long x);
+static void gator_buffer_write_bytes(int cpu, int buftype, char *x, int len);
+static void gator_buffer_write_string(int cpu, int buftype, char *x);
+static void gator_add_trace(int cpu, int buftype, unsigned int address);
+static void gator_add_sample(int cpu, int buftype, struct pt_regs * const regs);
+static uint64_t gator_get_time(void);
+
+static uint32_t gator_buffer_size[NUM_GATOR_BUFS];
+static uint32_t gator_buffer_mask[NUM_GATOR_BUFS];
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_read);
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_write);
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_commit);
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], buffer_space_available);
+static DEFINE_PER_CPU(char *[NUM_GATOR_BUFS], gator_buffer);
+
+/******************************************************************************
+ * Application Includes
+ ******************************************************************************/
+#include "gator_marshaling.c"
+#include "gator_hrtimer_perf.c"
+#include "gator_hrtimer_gator.c"
+#include "gator_cookies.c"
+#include "gator_trace_sched.c"
+#include "gator_trace_power.c"
+#include "gator_trace_gpu.c"
+#include "gator_backtrace.c"
+#include "gator_annotate.c"
+#include "gator_fs.c"
+#include "gator_ebs.c"
+#include "gator_pack.c"
+
+/******************************************************************************
+ * Misc
+ ******************************************************************************/
+#if defined(__arm__)
+u32 gator_cpuid(void)
+{
+	u32 val;
+	asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r" (val));
+	return (val >> 4) & 0xfff;
+}
+#endif
+
+/******************************************************************************
+ * Commit interface
+ ******************************************************************************/
+static bool buffer_commit_ready(int* cpu, int* buftype)
+{
+	int cpu_x, x;
+	for_each_present_cpu(cpu_x) {
+		for (x = 0; x < NUM_GATOR_BUFS; x++)
+			if (per_cpu(gator_buffer_commit, cpu_x)[x] != per_cpu(gator_buffer_read, cpu_x)[x]) {
+				*cpu = cpu_x;
+				*buftype = x;
+				return true;
+			}
+	}
+	return false;
+}
+
+/******************************************************************************
+ * Buffer management
+ ******************************************************************************/
+static int buffer_bytes_available(int cpu, int buftype)
+{
+	int remaining, filled;
+
+	filled = per_cpu(gator_buffer_write, cpu)[buftype] - per_cpu(gator_buffer_read, cpu)[buftype];
+	if (filled < 0) {
+		filled += gator_buffer_size[buftype];
+	}
+
+	remaining = gator_buffer_size[buftype] - filled;
+
+	if (per_cpu(buffer_space_available, cpu)[buftype]) {
+		// Give some extra room; also allows space to insert the overflow error packet
+		remaining -= 200;
+	} else {
+		// Hysteresis, prevents multiple overflow messages
+		remaining -= 2000;
+	}
+
+	return remaining;
+}
+
+static int contiguous_space_available(int cpu, int buftype)
+{
+	int remaining = buffer_bytes_available(cpu, buftype);
+	int contiguous = gator_buffer_size[buftype] - per_cpu(gator_buffer_write, cpu)[buftype];
+	if (remaining < contiguous)
+		return remaining;
+	else
+		return contiguous;
+}
+
+static bool buffer_check_space(int cpu, int buftype, int bytes)
+{
+	int remaining = buffer_bytes_available(cpu, buftype);
+
+	if (remaining < bytes) {
+		per_cpu(buffer_space_available, cpu)[buftype] = false;
+	} else {
+		per_cpu(buffer_space_available, cpu)[buftype] = true;
+	}
+
+	return per_cpu(buffer_space_available, cpu)[buftype];
+}
+
+static void gator_buffer_write_bytes(int cpu, int buftype, char *x, int len)
+{
+	int i;
+	u32 write = per_cpu(gator_buffer_write, cpu)[buftype];
+	u32 mask = gator_buffer_mask[buftype];
+	char* buffer = per_cpu(gator_buffer, cpu)[buftype];
+
+	for (i = 0; i < len; i++) {
+		buffer[write] = x[i];
+		write = (write + 1) & mask;
+	}
+
+	per_cpu(gator_buffer_write, cpu)[buftype] = write;
+}
+
+static void gator_buffer_write_string(int cpu, int buftype, char *x)
+{
+	int len = strlen(x);
+	gator_buffer_write_packed_int(cpu, buftype, len);
+	gator_buffer_write_bytes(cpu, buftype, x, len);
+}
+
+static void gator_buffer_header(int cpu, int buftype)
+{
+	int frame;
+
+	if (buftype == BACKTRACE_BUF)
+		frame = FRAME_BACKTRACE;
+	else if (buftype == COUNTER_BUF)
+		frame = FRAME_COUNTER;
+	else if (buftype == ANNOTATE_BUF)
+		frame = FRAME_ANNOTATE;
+	else if (buftype == SCHED_TRACE_BUF)
+		frame = FRAME_SCHED_TRACE;
+	else if (buftype == GPU_TRACE_BUF)
+		frame = FRAME_GPU_TRACE;
+	else if (buftype == COUNTER2_BUF)
+		frame = FRAME_COUNTER2;
+	else if (buftype == WFI_BUF)
+		frame = FRAME_WFI;
+	else
+		frame = -1;
+
+	if (per_cpu(gator_buffer, cpu)[buftype]) {
+		marshal_frame(cpu, buftype, frame);
+	}
+}
+
+static void gator_commit_buffer(int cpu, int buftype)
+{
+	if (!per_cpu(gator_buffer, cpu)[buftype])
+		return;
+
+	per_cpu(gator_buffer_commit, cpu)[buftype] = per_cpu(gator_buffer_write, cpu)[buftype];
+	gator_buffer_header(cpu, buftype);
+	wake_up(&gator_buffer_wait);
+}
+
+static void buffer_check(int cpu, int buftype)
+{
+	int filled = per_cpu(gator_buffer_write, cpu)[buftype] - per_cpu(gator_buffer_commit, cpu)[buftype];
+	if (filled < 0) {
+		filled += gator_buffer_size[buftype];
+	}
+	if (filled >= ((gator_buffer_size[buftype] * 3) / 4)) {
+		gator_commit_buffer(cpu, buftype);
+	}
+}
+
+static void gator_add_trace(int cpu, int buftype, unsigned int address)
+{
+	off_t offset = 0;
+	unsigned long cookie = get_address_cookie(cpu, buftype, current, address & ~1, &offset);
+
+	if (cookie == NO_COOKIE || cookie == INVALID_COOKIE) {
+		offset = address;
+	}
+
+	marshal_backtrace(offset & ~1, cookie);
+}
+
+static void gator_add_sample(int cpu, int buftype, struct pt_regs * const regs)
+{
+	int inKernel = regs ? !user_mode(regs) : 1;
+	unsigned long exec_cookie = inKernel ? NO_COOKIE : get_exec_cookie(cpu, buftype, current);
+
+	if (!regs)
+		return;
+
+	if (!marshal_backtrace_header(exec_cookie, current->tgid, current->pid, inKernel))
+		return;
+
+	if (inKernel) {
+		kernel_backtrace(cpu, buftype, regs);
+	} else {
+		// Cookie+PC
+		gator_add_trace(cpu, buftype, PC_REG);
+
+		// Backtrace
+		if (gator_backtrace_depth)
+			arm_backtrace_eabi(cpu, buftype, regs, gator_backtrace_depth);
+	}
+
+	marshal_backtrace_footer();
+}
+
+/******************************************************************************
+ * hrtimer interrupt processing
+ ******************************************************************************/
+static void gator_timer_interrupt(void)
+{
+	struct pt_regs * const regs = get_irq_regs();
+	int cpu = smp_processor_id();
+
+	// Output backtrace
+	gator_add_sample(cpu, BACKTRACE_BUF, regs);
+
+	// Collect counters
+	collect_counters();
+}
+
+static int gator_running;
+
+// This function runs in interrupt context and on the appropriate core
+static void gator_timer_offline(void* unused)
+{
+	struct gator_interface *gi;
+	int i, len, cpu = smp_processor_id();
+	int* buffer;
+
+	gator_trace_sched_offline();
+	gator_trace_power_offline();
+
+	gator_hrtimer_offline(cpu);
+
+	// Offline any events and output counters
+	if (marshal_event_header()) {
+		list_for_each_entry(gi, &gator_events, list) {
+			if (gi->offline) {
+				len = gi->offline(&buffer);
+				marshal_event(len, buffer);
+			}
+		}
+	}
+
+	// Flush all buffers on this core
+	for (i = 0; i < NUM_GATOR_BUFS; i++)
+		gator_commit_buffer(cpu, i);
+}
+
+// This function runs in process context and may be running on a core other than core 'cpu'
+static void gator_timer_offline_dispatch(int cpu)
+{
+	struct gator_interface *gi;
+
+	list_for_each_entry(gi, &gator_events, list)
+		if (gi->offline_dispatch)
+			gi->offline_dispatch(cpu);
+
+	gator_event_sampling_offline_dispatch(cpu);
+}
+
+static void gator_timer_stop(void)
+{
+	int cpu;
+
+	if (gator_running) {
+		on_each_cpu(gator_timer_offline, NULL, 1);
+		for_each_online_cpu(cpu) {
+			gator_timer_offline_dispatch(cpu);
+		}
+
+		gator_running = 0;
+		gator_hrtimer_shutdown();
+	}
+}
+
+// This function runs in interrupt context and on the appropriate core
+static void gator_timer_online(void* unused)
+{
+	struct gator_interface *gi;
+	int len, cpu = smp_processor_id();
+	int* buffer;
+
+	gator_trace_power_online();
+
+	// online any events and output counters
+	if (marshal_event_header()) {
+		list_for_each_entry(gi, &gator_events, list) {
+			if (gi->online) {
+				len = gi->online(&buffer);
+				marshal_event(len, buffer);
+			}
+		}
+	}
+
+	gator_hrtimer_online(cpu);
+}
+
+// This function runs in interrupt context and may be running on a core other than core 'cpu'
+static void gator_timer_online_dispatch(int cpu)
+{
+	struct gator_interface *gi;
+
+	list_for_each_entry(gi, &gator_events, list)
+		if (gi->online_dispatch)
+			gi->online_dispatch(cpu);
+
+	gator_event_sampling_online_dispatch(cpu);
+}
+
+int gator_timer_start(unsigned long sample_rate)
+{
+	int cpu;
+
+	if (gator_running) {
+		pr_notice("gator: already running\n");
+		return 0;
+	}
+
+	gator_running = 1;
+
+	// event based sampling trumps hr timer based sampling
+	if (event_based_sampling)
+		sample_rate = 0;
+
+	if (gator_hrtimer_init(sample_rate, gator_timer_interrupt) == -1)
+		return -1;
+
+	for_each_online_cpu(cpu) {
+		gator_timer_online_dispatch(cpu);
+	}
+	on_each_cpu(gator_timer_online, NULL, 1);
+
+	return 0;
+}
+
+static uint64_t gator_get_time(void)
+{
+	struct timespec ts;
+	uint64_t timestamp;
+
+	getnstimeofday(&ts);
+	timestamp = timespec_to_ns(&ts);
+
+	return timestamp;
+}
+
+/******************************************************************************
+ * cpu hotplug and pm notifiers
+ ******************************************************************************/
+static int __cpuinit gator_hotcpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
+{
+	long cpu = (long)hcpu;
+
+	switch (action) {
+		case CPU_DOWN_PREPARE:
+		case CPU_DOWN_PREPARE_FROZEN:
+			smp_call_function_single(cpu, gator_timer_offline, NULL, 1);
+			gator_timer_offline_dispatch(cpu);
+			break;
+		case CPU_ONLINE:
+		case CPU_ONLINE_FROZEN:
+			gator_timer_online_dispatch(cpu);
+			smp_call_function_single(cpu, gator_timer_online, NULL, 1);
+			break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __refdata gator_hotcpu_notifier = {
+	.notifier_call = gator_hotcpu_notify,
+};
+
+// n.b. calling "on_each_cpu" only runs on those that are online
+// Registered linux events are not disabled, so their counters will continue to collect
+static int gator_pm_notify(struct notifier_block *nb, unsigned long event, void *dummy)
+{
+	int cpu;
+
+	switch (event) {
+		case PM_HIBERNATION_PREPARE:
+		case PM_SUSPEND_PREPARE:
+			unregister_hotcpu_notifier(&gator_hotcpu_notifier);
+			unregister_scheduler_tracepoints();
+			on_each_cpu(gator_timer_offline, NULL, 1);
+			for_each_online_cpu(cpu) {
+				gator_timer_offline_dispatch(cpu);
+			}
+			break;
+		case PM_POST_HIBERNATION:
+		case PM_POST_SUSPEND:
+			for_each_online_cpu(cpu) {
+				gator_timer_online_dispatch(cpu);
+			}
+			on_each_cpu(gator_timer_online, NULL, 1);
+			register_scheduler_tracepoints();
+			register_hotcpu_notifier(&gator_hotcpu_notifier);
+			break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block gator_pm_notifier = {
+	.notifier_call = gator_pm_notify,
+};
+
+static int gator_notifier_start(void)
+{
+	int retval;
+	retval = register_hotcpu_notifier(&gator_hotcpu_notifier);
+	if (retval == 0)
+		retval = register_pm_notifier(&gator_pm_notifier);
+	return retval;
+}
+
+static void gator_notifier_stop(void)
+{
+	unregister_pm_notifier(&gator_pm_notifier);
+	unregister_hotcpu_notifier(&gator_hotcpu_notifier);
+}
+
+/******************************************************************************
+ * Main
+ ******************************************************************************/
+static void gator_summary(void)
+{
+	uint64_t timestamp, uptime = 0;
+	struct timespec uptime_ts;
+	void (*m2b)(struct timespec *ts);
+
+	timestamp = gator_get_time();
+
+	do_posix_clock_monotonic_gettime(&uptime_ts);
+	m2b = symbol_get(monotonic_to_bootbased);
+	if (m2b) {
+		m2b(&uptime_ts);
+		uptime = (long long)uptime_ts.tv_sec * 1000000000 + uptime_ts.tv_nsec;
+	}
+
+	marshal_summary(timestamp, uptime);
+}
+
+int gator_events_install(struct gator_interface *interface)
+{
+	list_add_tail(&interface->list, &gator_events);
+
+	return 0;
+}
+
+int gator_events_get_key(void)
+{
+	// key of zero is reserved as a timestamp
+	static int key = 1;
+
+	return key++;
+}
+
+static int gator_init(void)
+{
+	int i;
+
+	// events sources (gator_events.h, generated by gator_events.sh)
+	for (i = 0; i < ARRAY_SIZE(gator_events_list); i++)
+		if (gator_events_list[i])
+			gator_events_list[i]();
+
+	gator_trace_power_init();
+
+	return 0;
+}
+
+static int gator_start(void)
+{
+	unsigned long cpu, i;
+	struct gator_interface *gi;
+
+	// Initialize the buffer with the frame type and core
+	for_each_present_cpu(cpu) {
+		for (i = 0; i < NUM_GATOR_BUFS; i++) {
+			gator_buffer_header(cpu, i);
+		}
+	}
+
+	// Capture the start time  
+	gator_summary();
+
+	// start all events
+	list_for_each_entry(gi, &gator_events, list) {
+		if (gi->start && gi->start() != 0) {
+			struct list_head *ptr = gi->list.prev;
+
+			while (ptr != &gator_events) {
+				gi = list_entry(ptr, struct gator_interface, list);
+
+				if (gi->stop)
+					gi->stop();
+
+				ptr = ptr->prev;
+			}
+			goto events_failure;
+		}
+	}
+
+	// cookies shall be initialized before trace_sched_start() and gator_timer_start()
+	if (cookies_initialize())
+		goto cookies_failure;
+	if (gator_annotate_start())
+		goto annotate_failure;
+	if (gator_trace_sched_start())
+		goto sched_failure;
+	if (gator_trace_power_start())
+		goto power_failure;
+	if (gator_trace_gpu_start())
+		goto gpu_failure;
+	if (gator_event_sampling_start())
+		goto event_sampling_failure;
+	if (gator_timer_start(gator_timer_count))
+		goto timer_failure;
+	if (gator_notifier_start())
+		goto notifier_failure;
+
+	return 0;
+
+notifier_failure:
+	gator_timer_stop();
+timer_failure:
+	gator_event_sampling_stop();
+event_sampling_failure:
+	gator_trace_gpu_stop();
+gpu_failure:
+	gator_trace_power_stop();
+power_failure:
+	gator_trace_sched_stop();
+sched_failure:
+	gator_annotate_stop();
+annotate_failure:
+	cookies_release();
+cookies_failure:
+	// stop all events
+	list_for_each_entry(gi, &gator_events, list)
+		if (gi->stop)
+			gi->stop();
+events_failure:
+
+	return -1;
+}
+
+static void gator_stop(void)
+{
+	struct gator_interface *gi;
+
+	// stop all events
+	list_for_each_entry(gi, &gator_events, list)
+		if (gi->stop)
+			gi->stop();
+
+	gator_annotate_stop();
+	gator_trace_sched_stop();
+	gator_trace_power_stop();
+	gator_trace_gpu_stop();
+	gator_event_sampling_stop();
+
+	// stop all interrupt callback reads before tearing down other interfaces
+	gator_notifier_stop(); // should be called before gator_timer_stop to avoid re-enabling the hrtimer after it has been offlined
+	gator_timer_stop();
+}
+
+/******************************************************************************
+ * Filesystem
+ ******************************************************************************/
+/* fopen("buffer") */
+static int gator_op_setup(void)
+{
+	int err = 0;
+	int cpu, i;
+
+	mutex_lock(&start_mutex);
+
+	gator_buffer_size[BACKTRACE_BUF] = BACKTRACE_BUFFER_SIZE;
+	gator_buffer_mask[BACKTRACE_BUF] = BACKTRACE_BUFFER_SIZE - 1;
+
+	gator_buffer_size[COUNTER_BUF] = COUNTER_BUFFER_SIZE;
+	gator_buffer_mask[COUNTER_BUF] = COUNTER_BUFFER_SIZE - 1;
+
+	gator_buffer_size[SCHED_TRACE_BUF] = SCHED_TRACE_BUFFER_SIZE;
+	gator_buffer_mask[SCHED_TRACE_BUF] = SCHED_TRACE_BUFFER_SIZE - 1;
+
+	gator_buffer_size[GPU_TRACE_BUF] = GPU_TRACE_BUFFER_SIZE;
+	gator_buffer_mask[GPU_TRACE_BUF] = GPU_TRACE_BUFFER_SIZE - 1;
+
+	gator_buffer_size[ANNOTATE_BUF] = ANNOTATE_BUFFER_SIZE;
+	gator_buffer_mask[ANNOTATE_BUF] = ANNOTATE_BUFFER_SIZE - 1;
+
+	gator_buffer_size[COUNTER2_BUF] = COUNTER2_BUFFER_SIZE;
+	gator_buffer_mask[COUNTER2_BUF] = COUNTER2_BUFFER_SIZE - 1;
+
+	gator_buffer_size[WFI_BUF] = WFI_BUFFER_SIZE;
+	gator_buffer_mask[WFI_BUF] = WFI_BUFFER_SIZE - 1;
+
+	// Initialize percpu per buffer variables
+	for (i = 0; i < NUM_GATOR_BUFS; i++) {
+		// Verify buffers are a power of 2
+		if (gator_buffer_size[i] & (gator_buffer_size[i] - 1)) {
+			err = -ENOEXEC;
+			goto setup_error;
+		}
+
+		for_each_present_cpu(cpu) {
+			per_cpu(gator_buffer_read, cpu)[i] = 0;
+			per_cpu(gator_buffer_write, cpu)[i] = 0;
+			per_cpu(gator_buffer_commit, cpu)[i] = 0;
+			per_cpu(buffer_space_available, cpu)[i] = true;
+
+			// Annotation is a special case that only uses a single buffer
+			if (cpu > 0 && i == ANNOTATE_BUF) {
+				per_cpu(gator_buffer, cpu)[i] = NULL;
+				continue;
+			}
+
+			per_cpu(gator_buffer, cpu)[i] = vmalloc(gator_buffer_size[i]);
+			if (!per_cpu(gator_buffer, cpu)[i]) {
+				err = -ENOMEM;
+				goto setup_error;
+			}
+		}
+	}
+
+setup_error:
+	mutex_unlock(&start_mutex);
+	return err;
+}
+
+/* Actually start profiling (echo 1>/dev/gator/enable) */
+static int gator_op_start(void)
+{
+	int err = 0;
+
+	mutex_lock(&start_mutex);
+
+	if (gator_started || gator_start())
+		err = -EINVAL;
+	else
+		gator_started = 1;
+
+	mutex_unlock(&start_mutex);
+
+	return err;
+}
+
+/* echo 0>/dev/gator/enable */
+static void gator_op_stop(void)
+{
+	mutex_lock(&start_mutex);
+
+	if (gator_started) {
+		gator_stop();
+
+		mutex_lock(&gator_buffer_mutex);
+
+		gator_started = 0;
+		cookies_release();
+		wake_up(&gator_buffer_wait);
+
+		mutex_unlock(&gator_buffer_mutex);
+	}
+
+	mutex_unlock(&start_mutex);
+}
+
+static void gator_shutdown(void)
+{
+	int cpu, i;
+
+	mutex_lock(&start_mutex);
+
+	for_each_present_cpu(cpu) {
+		mutex_lock(&gator_buffer_mutex);
+		for (i = 0; i < NUM_GATOR_BUFS; i++) {
+			vfree(per_cpu(gator_buffer, cpu)[i]);
+			per_cpu(gator_buffer, cpu)[i] = NULL;
+			per_cpu(gator_buffer_read, cpu)[i] = 0;
+			per_cpu(gator_buffer_write, cpu)[i] = 0;
+			per_cpu(gator_buffer_commit, cpu)[i] = 0;
+			per_cpu(buffer_space_available, cpu)[i] = true;
+		}
+		mutex_unlock(&gator_buffer_mutex);
+	}
+
+	mutex_unlock(&start_mutex);
+}
+
+static int gator_set_backtrace(unsigned long val)
+{
+	int err = 0;
+
+	mutex_lock(&start_mutex);
+
+	if (gator_started)
+		err = -EBUSY;
+	else
+		gator_backtrace_depth = val;
+
+	mutex_unlock(&start_mutex);
+
+	return err;
+}
+
+static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return gatorfs_ulong_to_user(gator_started, buf, count, offset);
+}
+
+static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long val;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	retval = gatorfs_ulong_from_user(&val, buf, count);
+	if (retval)
+		return retval;
+
+	if (val)
+		retval = gator_op_start();
+	else
+		gator_op_stop();
+
+	if (retval)
+		return retval;
+	return count;
+}
+
+static const struct file_operations enable_fops = {
+	.read		= enable_read,
+	.write		= enable_write,
+};
+
+static int userspace_buffer_open(struct inode *inode, struct file *file)
+{
+	int err = -EPERM;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (test_and_set_bit_lock(0, &gator_buffer_opened))
+		return -EBUSY;
+
+	if ((err = gator_op_setup()))
+		goto fail;
+
+	/* NB: the actual start happens from userspace
+	 * echo 1 >/dev/gator/enable
+	 */
+
+	return 0;
+
+fail:
+	__clear_bit_unlock(0, &gator_buffer_opened);
+	return err;
+}
+
+static int userspace_buffer_release(struct inode *inode, struct file *file)
+{
+	gator_op_stop();
+	gator_shutdown();
+	__clear_bit_unlock(0, &gator_buffer_opened);
+	return 0;
+}
+
+static ssize_t userspace_buffer_read(struct file *file, char __user *buf,
+				 size_t count, loff_t *offset)
+{
+	int retval = -EINVAL;
+	int commit = 0, length, length1, length2, read, byte, type_length;
+	char *buffer1;
+	char *buffer2 = NULL;
+	int cpu, buftype;
+
+	/* do not handle partial reads */
+	if (count != userspace_buffer_size || *offset)
+		return -EINVAL;
+
+	// sleep until the condition is true or a signal is received
+	// the condition is checked each time gator_buffer_wait is woken up
+	buftype = cpu = -1;
+	wait_event_interruptible(gator_buffer_wait, buffer_commit_ready(&cpu, &buftype) || !gator_started);
+
+	if (signal_pending(current))
+		return -EINTR;
+
+	length2 = 0;
+	retval = -EFAULT;
+
+	mutex_lock(&gator_buffer_mutex);
+
+	if (buftype == -1 || cpu == -1) {
+		retval = 0;
+		goto out;
+	}
+
+	read = per_cpu(gator_buffer_read, cpu)[buftype];
+	commit = per_cpu(gator_buffer_commit, cpu)[buftype];
+
+	/* May happen if the buffer is freed during pending reads. */
+	if (!per_cpu(gator_buffer, cpu)[buftype]) {
+		retval = -EFAULT;
+		goto out;
+	}
+
+	/* determine the size of two halves */
+	length1 = commit - read;
+	buffer1 = &(per_cpu(gator_buffer, cpu)[buftype][read]);
+	buffer2 = &(per_cpu(gator_buffer, cpu)[buftype][0]);
+	if (length1 < 0) {
+		length1 = gator_buffer_size[buftype] - read;
+		length2 = commit;
+	}
+
+	// post-populate the length, which does not include the response type length nor the length itself, i.e. only the length of the payload
+	type_length = gator_response_type ? 1 : 0;
+	length = length1 + length2 - type_length - sizeof(int);
+	for (byte = 0; byte < sizeof(int); byte++) {
+		per_cpu(gator_buffer, cpu)[buftype][(read + type_length + byte) & gator_buffer_mask[buftype]] = (length >> byte * 8) & 0xFF;
+	}
+
+	/* start, middle or end */
+	if (length1 > 0) {
+		if (copy_to_user(&buf[0], buffer1, length1)) {
+			goto out;
+		}
+	}
+
+	/* possible wrap around */
+	if (length2 > 0) {
+		if (copy_to_user(&buf[length1], buffer2, length2)) {
+			goto out;
+		}
+	}
+
+	per_cpu(gator_buffer_read, cpu)[buftype] = commit;
+	retval = length1 + length2;
+
+	/* kick just in case we've lost an SMP event */
+	wake_up(&gator_buffer_wait);
+
+out:
+	mutex_unlock(&gator_buffer_mutex);
+	return retval;
+}
+
+const struct file_operations gator_event_buffer_fops = {
+	.open		= userspace_buffer_open,
+	.release	= userspace_buffer_release,
+	.read		= userspace_buffer_read,
+};
+
+static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	return gatorfs_ulong_to_user(gator_backtrace_depth, buf, count,
+					offset);
+}
+
+static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+	unsigned long val;
+	int retval;
+
+	if (*offset)
+		return -EINVAL;
+
+	retval = gatorfs_ulong_from_user(&val, buf, count);
+	if (retval)
+		return retval;
+
+	retval = gator_set_backtrace(val);
+
+	if (retval)
+		return retval;
+	return count;
+}
+
+static const struct file_operations depth_fops = {
+	.read		= depth_read,
+	.write		= depth_write
+};
+
+void gator_op_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+	struct gator_interface *gi;
+	int cpu;
+
+	/* reinitialize default values */
+	gator_cpu_cores = 0;
+	for_each_present_cpu(cpu) {
+		gator_cpu_cores++;
+	}
+	userspace_buffer_size =	BACKTRACE_BUFFER_SIZE;
+	gator_response_type = 1;
+
+	gatorfs_create_file(sb, root, "enable", &enable_fops);
+	gatorfs_create_file(sb, root, "buffer", &gator_event_buffer_fops);
+	gatorfs_create_file(sb, root, "backtrace_depth", &depth_fops);
+	gatorfs_create_ulong(sb, root, "cpu_cores", &gator_cpu_cores);
+	gatorfs_create_ulong(sb, root, "buffer_size", &userspace_buffer_size);
+	gatorfs_create_ulong(sb, root, "tick", &gator_timer_count);
+	gatorfs_create_ulong(sb, root, "response_type", &gator_response_type);
+	gatorfs_create_ro_ulong(sb, root, "version", &gator_protocol_version);
+
+	// Annotate interface
+	gator_annotate_create_files(sb, root);
+
+	// Linux Events
+	dir = gatorfs_mkdir(sb, root, "events");
+	list_for_each_entry(gi, &gator_events, list)
+		if (gi->create_files)
+			gi->create_files(sb, dir);
+
+	// Power interface
+	gator_trace_power_create_files(sb, dir);
+}
+
+/******************************************************************************
+ * Module
+ ******************************************************************************/
+static int __init gator_module_init(void)
+{
+	if (gatorfs_register()) {
+		return -1;
+	}
+
+	if (gator_init()) {
+		gatorfs_unregister();
+		return -1;
+	}
+
+	return 0;
+}
+
+static void __exit gator_module_exit(void)
+{
+	tracepoint_synchronize_unregister();
+	gatorfs_unregister();
+}
+
+module_init(gator_module_init);
+module_exit(gator_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ARM Ltd");
+MODULE_DESCRIPTION("Gator system profiler");
diff --git a/drivers/gator/gator_marshaling.c b/drivers/gator/gator_marshaling.c
new file mode 100755
index 00000000000..630d142bf70
--- /dev/null
+++ b/drivers/gator/gator_marshaling.c
@@ -0,0 +1,239 @@
+/**
+ * Copyright (C) ARM Limited 2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+static void marshal_summary(long long timestamp, long long uptime) {
+	int cpu = 0;
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, MESSAGE_SUMMARY);
+	gator_buffer_write_packed_int64(cpu, BACKTRACE_BUF, timestamp);
+	gator_buffer_write_packed_int64(cpu, BACKTRACE_BUF, uptime);
+}
+
+static bool marshal_cookie_header(char* text) {
+	int cpu = smp_processor_id();
+	return buffer_check_space(cpu, BACKTRACE_BUF, strlen(text) + 2 * MAXSIZE_PACK32);
+}
+
+static void marshal_cookie(int cookie, char* text) {
+	int cpu = smp_processor_id();
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, MESSAGE_COOKIE);
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, cookie);
+	gator_buffer_write_string(cpu, BACKTRACE_BUF, text);
+}
+
+static void marshal_pid_name(int pid, char* name) {
+	unsigned long flags, cpu;
+	local_irq_save(flags);
+	cpu = smp_processor_id();
+	if (buffer_check_space(cpu, BACKTRACE_BUF, TASK_COMM_LEN + 2 * MAXSIZE_PACK32 + MAXSIZE_PACK64)) {
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, MESSAGE_PID_NAME);
+		gator_buffer_write_packed_int64(cpu, BACKTRACE_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, pid);
+		gator_buffer_write_string(cpu, BACKTRACE_BUF, name);
+	}
+	local_irq_restore(flags);
+}
+
+static bool marshal_backtrace_header(int exec_cookie, int tgid, int pid, int inKernel) {
+	int cpu = smp_processor_id();
+	if (buffer_check_space(cpu, BACKTRACE_BUF, gator_backtrace_depth * 2 * MAXSIZE_PACK32)) {
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, MESSAGE_START_BACKTRACE);
+		gator_buffer_write_packed_int64(cpu, BACKTRACE_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, exec_cookie);
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, tgid); 
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, pid);
+		gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, inKernel);
+		return true;
+	}
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, BACKTRACE_BUF);
+
+	return false;
+}
+
+static void marshal_backtrace(int address, int cookie) {
+	int cpu = smp_processor_id();
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, address);
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, cookie);
+}
+
+static void marshal_backtrace_footer(void) {
+	int cpu = smp_processor_id();
+	gator_buffer_write_packed_int(cpu, BACKTRACE_BUF, MESSAGE_END_BACKTRACE);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, BACKTRACE_BUF);
+}
+
+static bool marshal_event_header(void) {
+	unsigned long flags, cpu = smp_processor_id();
+	bool retval = false;
+	
+	local_irq_save(flags);
+	if (buffer_check_space(cpu, COUNTER_BUF, MAXSIZE_PACK32 + MAXSIZE_PACK64)) {
+		gator_buffer_write_packed_int(cpu, COUNTER_BUF, 0); // key of zero indicates a timestamp
+		gator_buffer_write_packed_int64(cpu, COUNTER_BUF, gator_get_time());
+		retval = true;
+	}
+	local_irq_restore(flags);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, COUNTER_BUF);
+
+	return retval;
+}
+
+static void marshal_event(int len, int* buffer) {
+	unsigned long i, flags, cpu = smp_processor_id();
+
+	if (len <= 0)
+		return;
+	
+	// length must be even since all data is a (key, value) pair
+	if (len & 0x1) {
+		pr_err("gator: invalid counter data detected and discarded");
+		return;
+	}
+
+	// events must be written in key,value pairs
+	for (i = 0; i < len; i += 2) {
+		local_irq_save(flags);
+		if (!buffer_check_space(cpu, COUNTER_BUF, MAXSIZE_PACK32 * 2)) {
+			local_irq_restore(flags);
+			break;
+		}
+		gator_buffer_write_packed_int(cpu, COUNTER_BUF, buffer[i]);
+		gator_buffer_write_packed_int(cpu, COUNTER_BUF, buffer[i + 1]);
+		local_irq_restore(flags);
+	}
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, COUNTER_BUF);
+}
+
+static void marshal_event64(int len, long long* buffer64) {
+	unsigned long i, flags, cpu = smp_processor_id();
+
+	if (len <= 0)
+		return;
+	
+	// length must be even since all data is a (key, value) pair
+	if (len & 0x1) {
+		pr_err("gator: invalid counter data detected and discarded");
+		return;
+	}
+
+	// events must be written in key,value pairs
+	for (i = 0; i < len; i += 2) {
+		local_irq_save(flags);
+		if (!buffer_check_space(cpu, COUNTER_BUF, MAXSIZE_PACK64 * 2)) {
+			local_irq_restore(flags);
+			break;
+		}
+		gator_buffer_write_packed_int64(cpu, COUNTER_BUF, buffer64[i]);
+		gator_buffer_write_packed_int64(cpu, COUNTER_BUF, buffer64[i + 1]);
+		local_irq_restore(flags);
+	}
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, COUNTER_BUF);
+}
+
+#if GATOR_CPU_FREQ_SUPPORT
+static void marshal_event_single(int core, int key, int value) {
+	unsigned long flags, cpu;
+	
+	local_irq_save(flags);
+	cpu = smp_processor_id();
+	if (buffer_check_space(cpu, COUNTER2_BUF, MAXSIZE_PACK64 + MAXSIZE_PACK32 * 3)) {
+		gator_buffer_write_packed_int64(cpu, COUNTER2_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, COUNTER2_BUF, core);
+		gator_buffer_write_packed_int(cpu, COUNTER2_BUF, key);
+		gator_buffer_write_packed_int(cpu, COUNTER2_BUF, value);
+	}
+	local_irq_restore(flags);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, COUNTER2_BUF);
+}
+#endif
+
+static void marshal_sched_gpu(int type, int unit, int core, int tgid, int pid) {
+	unsigned long cpu = smp_processor_id(), flags;
+
+	if (!per_cpu(gator_buffer, cpu)[GPU_TRACE_BUF])
+		return;
+
+	local_irq_save(flags);
+	if (buffer_check_space(cpu, GPU_TRACE_BUF, MAXSIZE_PACK64 + 5 * MAXSIZE_PACK32)) {
+		gator_buffer_write_packed_int(cpu, GPU_TRACE_BUF, type);
+		gator_buffer_write_packed_int64(cpu, GPU_TRACE_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, GPU_TRACE_BUF, unit);
+		gator_buffer_write_packed_int(cpu, GPU_TRACE_BUF, core);
+		gator_buffer_write_packed_int(cpu, GPU_TRACE_BUF, tgid);
+		gator_buffer_write_packed_int(cpu, GPU_TRACE_BUF, pid);
+	}
+	local_irq_restore(flags);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, GPU_TRACE_BUF);
+}
+
+static void marshal_sched_trace(int type, int pid, int tgid, int cookie, int state) {
+	unsigned long cpu = smp_processor_id(), flags;
+
+	if (!per_cpu(gator_buffer, cpu)[SCHED_TRACE_BUF])
+		return;
+
+	local_irq_save(flags);
+	if (buffer_check_space(cpu, SCHED_TRACE_BUF, MAXSIZE_PACK64 + 5 * MAXSIZE_PACK32)) {
+		gator_buffer_write_packed_int(cpu, SCHED_TRACE_BUF, type);
+		gator_buffer_write_packed_int64(cpu, SCHED_TRACE_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, SCHED_TRACE_BUF, pid);
+		gator_buffer_write_packed_int(cpu, SCHED_TRACE_BUF, tgid);
+		gator_buffer_write_packed_int(cpu, SCHED_TRACE_BUF, cookie);
+		gator_buffer_write_packed_int(cpu, SCHED_TRACE_BUF, state);
+	}
+	local_irq_restore(flags);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, SCHED_TRACE_BUF);
+}
+
+#if GATOR_CPU_FREQ_SUPPORT
+static void marshal_wfi(int core, int state) {
+	unsigned long flags, cpu;
+	
+	local_irq_save(flags);
+	cpu = smp_processor_id();
+	if (buffer_check_space(cpu, WFI_BUF, MAXSIZE_PACK64 + MAXSIZE_PACK32 * 2)) {
+		gator_buffer_write_packed_int64(cpu, WFI_BUF, gator_get_time());
+		gator_buffer_write_packed_int(cpu, WFI_BUF, core);
+		gator_buffer_write_packed_int(cpu, WFI_BUF, state);
+	}
+	local_irq_restore(flags);
+
+	// Check and commit; commit is set to occur once buffer is 3/4 full
+	buffer_check(cpu, WFI_BUF);
+}
+#endif
+
+static void marshal_frame(int cpu, int buftype, int frame) {
+	// add response type
+	if (gator_response_type > 0) {
+		gator_buffer_write_packed_int(cpu, buftype, gator_response_type);
+	}
+
+	// leave space for 4-byte unpacked length
+	per_cpu(gator_buffer_write, cpu)[buftype] = (per_cpu(gator_buffer_write, cpu)[buftype] + 4) & gator_buffer_mask[buftype];
+
+	// add frame type and core number
+	gator_buffer_write_packed_int(cpu, buftype, frame);
+	gator_buffer_write_packed_int(cpu, buftype, cpu);
+}
diff --git a/drivers/gator/gator_pack.c b/drivers/gator/gator_pack.c
new file mode 100644
index 00000000000..925469a5b89
--- /dev/null
+++ b/drivers/gator/gator_pack.c
@@ -0,0 +1,164 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+static void gator_buffer_write_packed_int(int cpu, int buftype, unsigned int x)
+{
+	uint32_t write = per_cpu(gator_buffer_write, cpu)[buftype];
+	uint32_t mask = gator_buffer_mask[buftype];
+	char *buffer = per_cpu(gator_buffer, cpu)[buftype];
+	int write0 = (write + 0) & mask;
+	int write1 = (write + 1) & mask;
+
+	if ((x & 0xffffff80) == 0) {
+		buffer[write0] = x & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write1;
+	} else if ((x & 0xffffc000) == 0) {
+		int write2 = (write + 2) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write2;
+	} else if ((x & 0xffe00000) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write3;
+	} else if ((x & 0xf0000000) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write4;
+	} else {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) & 0x0f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write5;
+	}
+}
+
+static void gator_buffer_write_packed_int64(int cpu, int buftype, unsigned long long x)
+{
+	uint32_t write = per_cpu(gator_buffer_write, cpu)[buftype];
+	uint32_t mask = gator_buffer_mask[buftype];
+	char *buffer = per_cpu(gator_buffer, cpu)[buftype];
+	int write0 = (write + 0) & mask;
+	int write1 = (write + 1) & mask;
+
+	if ((x & 0xffffffffffffff80LL) == 0) {
+		buffer[write0] = x & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write1;
+	} else if ((x & 0xffffffffffffc000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write2;
+	} else if ((x & 0xffffffffffe00000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write3;
+	} else if ((x & 0xfffffffff0000000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write4;
+	} else if ((x & 0xfffffff800000000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write5;
+	} else if ((x & 0xfffffc0000000000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		int write6 = (write + 6) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) | 0x80;
+		buffer[write5] = (x>>35) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write6;
+	} else if ((x & 0xfffe000000000000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		int write6 = (write + 6) & mask;
+		int write7 = (write + 7) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) | 0x80;
+		buffer[write5] = (x>>35) | 0x80;
+		buffer[write6] = (x>>42) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write7;
+	} else if ((x & 0xff00000000000000LL) == 0) {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		int write6 = (write + 6) & mask;
+		int write7 = (write + 7) & mask;
+		int write8 = (write + 8) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) | 0x80;
+		buffer[write5] = (x>>35) | 0x80;
+		buffer[write6] = (x>>42) | 0x80;
+		buffer[write7] = (x>>49) & 0x7f;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write8;
+	} else {
+		int write2 = (write + 2) & mask;
+		int write3 = (write + 3) & mask;
+		int write4 = (write + 4) & mask;
+		int write5 = (write + 5) & mask;
+		int write6 = (write + 6) & mask;
+		int write7 = (write + 7) & mask;
+		int write8 = (write + 8) & mask;
+		int write9 = (write + 9) & mask;
+		buffer[write0] = x | 0x80;
+		buffer[write1] = (x>>7) | 0x80;
+		buffer[write2] = (x>>14) | 0x80;
+		buffer[write3] = (x>>21) | 0x80;
+		buffer[write4] = (x>>28) | 0x80;
+		buffer[write5] = (x>>35) | 0x80;
+		buffer[write6] = (x>>42) | 0x80;
+		buffer[write7] = (x>>49) | 0x80;
+		buffer[write8] = (x>>56) & 0xff;
+		per_cpu(gator_buffer_write, cpu)[buftype] = write9;
+	}
+}
diff --git a/drivers/gator/gator_trace_gpu.c b/drivers/gator/gator_trace_gpu.c
new file mode 100644
index 00000000000..921932c1fb1
--- /dev/null
+++ b/drivers/gator/gator_trace_gpu.c
@@ -0,0 +1,126 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "gator.h"
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/math64.h>
+
+#ifdef MALI_SUPPORT
+#include "linux/mali_linux_trace.h"
+#endif
+#include "gator_trace_gpu.h"
+
+#define ACTIVITY_START  1
+#define ACTIVITY_STOP   2
+
+/* Note whether tracepoints have been registered */
+static int mali_trace_registered;
+static int gpu_trace_registered;
+
+#define GPU_START			1
+#define GPU_STOP			2
+
+#define GPU_UNIT_VP			1
+#define GPU_UNIT_FP			2
+#define GPU_UNIT_CL			3
+
+#ifdef MALI_SUPPORT
+
+enum components {
+    COMPONENT_VP0 = 1,
+    COMPONENT_FP0 = 5,
+    COMPONENT_FP1,
+    COMPONENT_FP2,
+    COMPONENT_FP3,
+    COMPONENT_FP4,
+    COMPONENT_FP5,
+    COMPONENT_FP6,
+    COMPONENT_FP7,
+};
+
+GATOR_DEFINE_PROBE(mali_timeline_event, TP_PROTO(unsigned int event_id, unsigned int d0, unsigned int d1, unsigned int d2, unsigned int d3, unsigned int d4))
+{
+	unsigned int component, state;
+	int tgid = 0, pid = 0;
+
+	// do as much work as possible before disabling interrupts
+	component = (event_id >> 16) & 0xFF; // component is an 8-bit field
+	state = (event_id >> 24) & 0xF;      // state is a 4-bit field
+
+	if ((component == COMPONENT_VP0) || (component >= COMPONENT_FP0 && component <= COMPONENT_FP7)) {
+		if (state == ACTIVITY_START || state == ACTIVITY_STOP) {
+			unsigned int type = (state == ACTIVITY_START) ? GPU_START : GPU_STOP;
+			unsigned int unit = (component < COMPONENT_FP0) ? GPU_UNIT_VP : GPU_UNIT_FP;
+			unsigned int core = (component < COMPONENT_FP0) ? component - COMPONENT_VP0 : component - COMPONENT_FP0;
+			if (state == ACTIVITY_START) {
+				tgid = d0;
+				pid = d1;
+			}
+
+			marshal_sched_gpu(type, unit, core, tgid, pid);
+    	}
+    }
+}
+#endif
+
+GATOR_DEFINE_PROBE(gpu_activity_start, TP_PROTO(int gpu_unit, int gpu_core, struct task_struct *p))
+{
+	marshal_sched_gpu(GPU_START, gpu_unit, gpu_core, (int)p->tgid, (int)p->pid);
+}
+
+GATOR_DEFINE_PROBE(gpu_activity_stop, TP_PROTO(int gpu_unit, int gpu_core))
+{
+	marshal_sched_gpu(GPU_STOP, gpu_unit, gpu_core, 0, 0);
+}
+
+int gator_trace_gpu_start(void)
+{
+	/*
+	 * Returns nonzero for installation failed
+	 * Absence of gpu trace points is not an error
+	 */
+
+	gpu_trace_registered = mali_trace_registered = 0;
+
+#ifdef MALI_SUPPORT
+    if (!GATOR_REGISTER_TRACE(mali_timeline_event)) {
+    	mali_trace_registered = 1;
+    }
+#endif
+
+    if (!mali_trace_registered) {
+        if (GATOR_REGISTER_TRACE(gpu_activity_start)) {
+        	return 0;
+        }
+        if (GATOR_REGISTER_TRACE(gpu_activity_stop)) {
+        	GATOR_UNREGISTER_TRACE(gpu_activity_start);
+        	return 0;
+        }
+        gpu_trace_registered = 1;
+    }
+
+	return 0;
+}
+
+void gator_trace_gpu_stop(void)
+{
+#ifdef MALI_SUPPORT
+	if (mali_trace_registered) {
+		GATOR_UNREGISTER_TRACE(mali_timeline_event);
+	}
+#endif
+	if (gpu_trace_registered) {
+		GATOR_UNREGISTER_TRACE(gpu_activity_stop);
+		GATOR_UNREGISTER_TRACE(gpu_activity_start);
+	}
+
+	gpu_trace_registered = mali_trace_registered = 0;
+}
diff --git a/drivers/gator/gator_trace_gpu.h b/drivers/gator/gator_trace_gpu.h
new file mode 100644
index 00000000000..894289b4316
--- /dev/null
+++ b/drivers/gator/gator_trace_gpu.h
@@ -0,0 +1,79 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#undef TRACE_GPU
+#define TRACE_GPU gpu
+
+#if !defined(_TRACE_GPU_H)
+#define _TRACE_GPU_H
+
+#include <linux/tracepoint.h>
+
+/*
+ * UNIT - the GPU processor type
+ *  1 = Vertex Processor
+ *  2 = Fragment Processor
+ *
+ * CORE - the GPU processor core number
+ *  this is not the CPU core number
+ */
+
+/*
+ * Tracepoint for calling GPU unit start activity on core
+ */
+TRACE_EVENT(gpu_activity_start,
+
+	TP_PROTO(int gpu_unit, int gpu_core, struct task_struct *p),
+
+	TP_ARGS(gpu_unit, gpu_core, p),
+
+	TP_STRUCT__entry(
+		__field(        int,    gpu_unit                )
+		__field(        int,    gpu_core                )
+		__array(        char,   comm,   TASK_COMM_LEN   )
+		__field(        pid_t,  pid                     )
+	),
+
+	TP_fast_assign(
+		__entry->gpu_unit       = gpu_unit;
+		__entry->gpu_core       = gpu_core;
+		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
+		__entry->pid            = p->pid;
+	),
+
+	TP_printk("unit=%d core=%d comm=%s pid=%d",
+		__entry->gpu_unit, __entry->gpu_core, __entry->comm, __entry->pid)
+);
+
+/*
+ * Tracepoint for calling GPU unit stop activity on core
+ */
+TRACE_EVENT(gpu_activity_stop,
+
+	TP_PROTO(int gpu_unit, int gpu_core),
+
+	TP_ARGS(gpu_unit, gpu_core),
+
+	TP_STRUCT__entry(
+		__field(        int,    gpu_unit                )
+		__field(        int,    gpu_core                )
+	),
+
+	TP_fast_assign(
+		__entry->gpu_unit       = gpu_unit;
+		__entry->gpu_core       = gpu_core;
+	),
+
+	TP_printk("unit=%d core=%d",
+		__entry->gpu_unit, __entry->gpu_core)
+);
+
+#endif /* _TRACE_GPU_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/drivers/gator/gator_trace_power.c b/drivers/gator/gator_trace_power.c
new file mode 100755
index 00000000000..ca89b19908f
--- /dev/null
+++ b/drivers/gator/gator_trace_power.c
@@ -0,0 +1,160 @@
+/**
+ * Copyright (C) ARM Limited 2011-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/cpufreq.h>
+#include <trace/events/power.h>
+
+// cpu_frequency and cpu_idle trace points were introduced in Linux kernel v2.6.38
+// the now deprecated power_frequency trace point was available prior to 2.6.38, but only for x86
+#if GATOR_CPU_FREQ_SUPPORT
+enum {
+	POWER_CPU_FREQ,
+	POWER_CPU_IDLE,
+	POWER_TOTAL
+};
+
+static DEFINE_PER_CPU(ulong, idle_prev_state);
+static ulong power_cpu_enabled[POWER_TOTAL];
+static ulong power_cpu_key[POWER_TOTAL];
+
+static int gator_trace_power_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *dir;
+
+	// cpu_frequency
+	dir = gatorfs_mkdir(sb, root, "Linux_power_cpu_freq");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &power_cpu_enabled[POWER_CPU_FREQ]);
+	gatorfs_create_ro_ulong(sb, dir, "key", &power_cpu_key[POWER_CPU_FREQ]);
+
+	// cpu_idle
+	dir = gatorfs_mkdir(sb, root, "Linux_power_cpu_idle");
+	if (!dir) {
+		return -1;
+	}
+	gatorfs_create_ulong(sb, dir, "enabled", &power_cpu_enabled[POWER_CPU_IDLE]);
+	gatorfs_create_ro_ulong(sb, dir, "key", &power_cpu_key[POWER_CPU_IDLE]);
+
+	return 0;
+}
+
+// 'cpu' may not equal smp_processor_id(), i.e. may not be running on the core that is having the freq/idle state change
+GATOR_DEFINE_PROBE(cpu_frequency, TP_PROTO(unsigned int frequency, unsigned int cpu))
+{
+	marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], frequency * 1000);
+}
+
+#define WFI_ACTIVE_THRESHOLD 2  // may vary on platform/OS
+#define WFI_EXIT 0
+#define WFI_ENTER 1
+GATOR_DEFINE_PROBE(cpu_idle, TP_PROTO(unsigned int state, unsigned int cpu))
+{
+	// the streamline engine treats all counter values as unsigned
+	if (state & 0x80000000) {
+		state = 0;
+	}
+
+	if (state == per_cpu(idle_prev_state, cpu)) {
+		return;
+	}
+
+	if (state < WFI_ACTIVE_THRESHOLD && per_cpu(idle_prev_state, cpu) >= WFI_ACTIVE_THRESHOLD) {
+		// transition from wfi to non-wfi
+		marshal_wfi(cpu, WFI_EXIT);
+	} else if (state >= WFI_ACTIVE_THRESHOLD && per_cpu(idle_prev_state, cpu) < WFI_ACTIVE_THRESHOLD) {
+		// transition from non-wfi to wfi
+		marshal_wfi(cpu, WFI_ENTER);
+	}
+
+	per_cpu(idle_prev_state, cpu) = state;
+
+	if (power_cpu_enabled[POWER_CPU_IDLE]) {
+		marshal_event_single(cpu, power_cpu_key[POWER_CPU_IDLE], state);
+	}
+}
+
+static void gator_trace_power_online(void)
+{
+	int cpu = smp_processor_id();
+	if (power_cpu_enabled[POWER_CPU_FREQ]) {
+		marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], cpufreq_quick_get(cpu) * 1000);
+	}
+}
+
+static void gator_trace_power_offline(void)
+{
+	// Set frequency to zero on an offline
+	int cpu = smp_processor_id();
+	if (power_cpu_enabled[POWER_CPU_FREQ]) {
+		marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], 0);
+	}
+}
+
+static int gator_trace_power_start(void)
+{
+	int cpu;
+
+	// register tracepoints
+	if (power_cpu_enabled[POWER_CPU_FREQ])
+		if (GATOR_REGISTER_TRACE(cpu_frequency))
+			goto fail_cpu_frequency_exit;
+
+	// Always register for cpu:idle for detecting WFI, independent of power_cpu_enabled[POWER_CPU_IDLE]
+	if (GATOR_REGISTER_TRACE(cpu_idle))
+		goto fail_cpu_idle_exit;
+	pr_debug("gator: registered power event tracepoints\n");
+
+	for_each_present_cpu(cpu) {
+		per_cpu(idle_prev_state, cpu) = 0;
+	}
+
+	return 0;
+
+	// unregister tracepoints on error
+fail_cpu_idle_exit:
+	if (power_cpu_enabled[POWER_CPU_FREQ])
+		GATOR_UNREGISTER_TRACE(cpu_frequency);
+fail_cpu_frequency_exit:
+	pr_err("gator: power event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
+
+	return -1;
+}
+
+static void gator_trace_power_stop(void)
+{
+	int i;
+
+	if (power_cpu_enabled[POWER_CPU_FREQ])
+		GATOR_UNREGISTER_TRACE(cpu_frequency);
+	GATOR_UNREGISTER_TRACE(cpu_idle);
+	pr_debug("gator: unregistered power event tracepoints\n");
+
+	for (i = 0; i < POWER_TOTAL; i++) {
+		power_cpu_enabled[i] = 0;
+	}
+}
+
+void gator_trace_power_init(void)
+{
+	int i;
+	for (i = 0; i < POWER_TOTAL; i++) {
+		power_cpu_enabled[i] = 0;
+		power_cpu_key[i] = gator_events_get_key();
+	}
+}
+#else
+static int gator_trace_power_create_files(struct super_block *sb, struct dentry *root) {return 0;}
+static void gator_trace_power_online(void) {}
+static void gator_trace_power_offline(void) {}
+static int gator_trace_power_start(void) {return 0;}
+static void gator_trace_power_stop(void) {}
+void gator_trace_power_init(void) {}
+#endif
diff --git a/drivers/gator/gator_trace_sched.c b/drivers/gator/gator_trace_sched.c
new file mode 100644
index 00000000000..08b02709485
--- /dev/null
+++ b/drivers/gator/gator_trace_sched.c
@@ -0,0 +1,191 @@
+/**
+ * Copyright (C) ARM Limited 2010-2012. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <trace/events/sched.h>
+#include "gator.h"
+
+#define SCHED_SWITCH			1
+#define SCHED_PROCESS_EXIT		2
+
+#define TASK_MAP_ENTRIES		1024		/* must be power of 2 */
+#define TASK_MAX_COLLISIONS		2
+
+static DEFINE_PER_CPU(uint64_t *, taskname_keys);
+
+enum {
+	STATE_WAIT_ON_OTHER = 0,
+	STATE_CONTENTION,
+	STATE_WAIT_ON_IO,
+	STATE_WAIT_ON_MUTEX,
+};
+
+void emit_pid_name(struct task_struct* task)
+{
+	bool found = false;
+	char taskcomm[TASK_COMM_LEN + 3];
+	unsigned long x, cpu = smp_processor_id();
+	uint64_t *keys = &(per_cpu(taskname_keys, cpu)[(task->pid & 0xFF) * TASK_MAX_COLLISIONS]);
+	uint64_t value;
+	
+	value = gator_chksum_crc32(task->comm);
+	value = (value << 32) | (uint32_t)task->pid;
+
+	// determine if the thread name was emitted already
+	for (x = 0; x < TASK_MAX_COLLISIONS; x++) {
+		if (keys[x] == value) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		// shift values, new value always in front
+		uint64_t oldv, newv = value;
+		for (x = 0; x < TASK_MAX_COLLISIONS; x++) {
+			oldv = keys[x];
+			keys[x] = newv;
+			newv = oldv;
+		}
+
+		// emit pid names, cannot use get_task_comm, as it's not exported on all kernel versions
+		if (strlcpy(taskcomm, task->comm, TASK_COMM_LEN) == TASK_COMM_LEN - 1) {
+			// append ellipses if task->comm has length of TASK_COMM_LEN - 1
+			strcat(taskcomm, "...");
+		}
+
+		marshal_pid_name(task->pid, taskcomm);
+	}
+}
+
+
+static void collect_counters(void)
+{
+	int *buffer, len;
+	long long *buffer64;
+	struct gator_interface *gi;
+
+	if (marshal_event_header()) {
+		list_for_each_entry(gi, &gator_events, list) {
+			if (gi->read) {
+				len = gi->read(&buffer);
+				marshal_event(len, buffer);
+			} else if (gi->read64) {
+				len = gi->read64(&buffer64);
+				marshal_event64(len, buffer64);
+			}
+		}
+	}
+}
+
+static void probe_sched_write(int type, struct task_struct* task, struct task_struct* old_task)
+{
+	int cookie = 0, state = 0;
+	int cpu = smp_processor_id();
+	int pid = task->pid;
+	int tgid = task->tgid;
+
+	if (type == SCHED_SWITCH) {
+		// do as much work as possible before disabling interrupts
+		cookie = get_exec_cookie(cpu, BACKTRACE_BUF, task);
+		emit_pid_name(task);
+		if (old_task->state == TASK_RUNNING) {
+			state = STATE_CONTENTION;
+		} else if (old_task->in_iowait) {
+			state = STATE_WAIT_ON_IO;
+#ifdef CONFIG_DEBUG_MUTEXES
+		} else if (old_task->blocked_on) {
+			state = STATE_WAIT_ON_MUTEX;
+#endif
+		} else {
+			state = STATE_WAIT_ON_OTHER;
+		}
+
+		collect_counters();
+	}
+
+	// marshal_sched_trace() disables interrupts as the free may trigger while switch is writing to the buffer; disabling preemption is not sufficient
+	// is disable interrupts necessary now that exit is used instead of free?
+	marshal_sched_trace(type, pid, tgid, cookie, state);
+}
+
+// special case used during a suspend of the system
+static void trace_sched_insert_idle(void)
+{
+	marshal_sched_trace(SCHED_SWITCH, 0, 0, 0, 0);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
+GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct rq *rq, struct task_struct *prev, struct task_struct *next))
+#else
+GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct task_struct *prev, struct task_struct *next))
+#endif
+{
+	probe_sched_write(SCHED_SWITCH, next, prev);
+}
+
+GATOR_DEFINE_PROBE(sched_process_exit, TP_PROTO(struct task_struct *p))
+{
+	probe_sched_write(SCHED_PROCESS_EXIT, p, 0);
+}
+
+static int register_scheduler_tracepoints(void) {
+	// register tracepoints
+	if (GATOR_REGISTER_TRACE(sched_switch))
+		goto fail_sched_switch;
+	if (GATOR_REGISTER_TRACE(sched_process_exit))
+		goto fail_sched_process_exit;
+	pr_debug("gator: registered tracepoints\n");
+
+	return 0;
+
+	// unregister tracepoints on error
+fail_sched_process_exit:
+	GATOR_UNREGISTER_TRACE(sched_switch);
+fail_sched_switch:
+	pr_err("gator: tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
+
+	return -1;
+}
+
+int gator_trace_sched_start(void)
+{
+	int cpu, size;
+
+	for_each_present_cpu(cpu) {
+		size = TASK_MAP_ENTRIES * TASK_MAX_COLLISIONS * sizeof(uint64_t);
+		per_cpu(taskname_keys, cpu) = (uint64_t*)kmalloc(size, GFP_KERNEL);
+		if (!per_cpu(taskname_keys, cpu))
+			return -1;
+		memset(per_cpu(taskname_keys, cpu), 0, size);
+	}
+
+	return register_scheduler_tracepoints();
+}
+
+void gator_trace_sched_offline(void)
+{
+	trace_sched_insert_idle();
+}
+
+static void unregister_scheduler_tracepoints(void)
+{
+	GATOR_UNREGISTER_TRACE(sched_switch);
+	GATOR_UNREGISTER_TRACE(sched_process_exit);
+	pr_debug("gator: unregistered tracepoints\n");
+}
+
+void gator_trace_sched_stop(void)
+{
+	int cpu;
+	unregister_scheduler_tracepoints();
+
+	for_each_present_cpu(cpu) {
+		kfree(per_cpu(taskname_keys, cpu));
+	}
+}