pmem: Add pmem driver

Signed-off-by: Rebecca Schultz <rschultz@google.com>

pmem: Use the thread group leader insted of the current thread.

Instead of keeping track of the current thread, use the thread group leader

Signed-off-by: Rebecca Schultz <rschultz@google.com>

pmem: Add some apis to reference and flush pmem files by file struct

The api to refer to pmem files by fd should be depricated, it can
cause problems if a processes fd table changes while the kernel is processing
data in a pmem file.  This change adds the safer api.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

pmem: Remove unused depricated fd api to pmem.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

pmem: Remove error message when calling get_pmem_addr

This call is used from the mdp driver to determine if the memory
is in pmem or in the fb.  We will encounter this case during normal operation
so this error message should be removed.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

pmem: Add include sched.h to fix compile errors

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

pmem: remove HW3D_* ioctls

Signed-off-by: Dima Zavin <dima@android.com>

pmem: Expose is_pmem_file to the in-kernel users.

Signed-off-by: Dima Zavin <dima@android.com>

pmem: Make the exposed functions be noops if CONFIG_ANDROID_PMEM is not set.

Signed-off-by: Dima Zavin <dima@android.com>

misc: pmem: don't flush if file was opened with O_SYNC

Change-Id: I067218658a0d7f7ecc1fe73e9ff6b0c3b3054653
Signed-off-by: Dima Zavin <dima@android.com>

pmem: Add cache flush ioctl for pmem buffers

Change-Id: I9156bad829e8c65087f122b48cc57638902fab12
Signed-off-by: Dima Zavin <dima@android.com>

Allow multiple pmem master mmap()s.

Signed-off-by: Jamie Gennis <jgennis@google.com>
Change-Id: Icbe619c92e0ebb391f0a93f81937705452a67d87

pmem: convert data_list_sem to a mutex

Also rename a function that now conflicts with a new
define in asm/pgtable.h

Change-Id: I4798048cb8dece1bc03604e7d0b03d86e0c0ef7f
Signed-off-by: Dima Zavin <dima@android.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/include/linux/android_pmem.h b/include/linux/android_pmem.h
new file mode 100644
index 00000000000..f633621f5be
--- /dev/null
+++ b/include/linux/android_pmem.h
@@ -0,0 +1,93 @@
+/* include/linux/android_pmem.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _ANDROID_PMEM_H_
+#define _ANDROID_PMEM_H_
+
+#define PMEM_IOCTL_MAGIC 'p'
+#define PMEM_GET_PHYS		_IOW(PMEM_IOCTL_MAGIC, 1, unsigned int)
+#define PMEM_MAP		_IOW(PMEM_IOCTL_MAGIC, 2, unsigned int)
+#define PMEM_GET_SIZE		_IOW(PMEM_IOCTL_MAGIC, 3, unsigned int)
+#define PMEM_UNMAP		_IOW(PMEM_IOCTL_MAGIC, 4, unsigned int)
+/* This ioctl will allocate pmem space, backing the file, it will fail
+ * if the file already has an allocation, pass it the len as the argument
+ * to the ioctl */
+#define PMEM_ALLOCATE		_IOW(PMEM_IOCTL_MAGIC, 5, unsigned int)
+/* This will connect a one pmem file to another, pass the file that is already
+ * backed in memory as the argument to the ioctl
+ */
+#define PMEM_CONNECT		_IOW(PMEM_IOCTL_MAGIC, 6, unsigned int)
+/* Returns the total size of the pmem region it is sent to as a pmem_region
+ * struct (with offset set to 0). 
+ */
+#define PMEM_GET_TOTAL_SIZE	_IOW(PMEM_IOCTL_MAGIC, 7, unsigned int)
+#define PMEM_CACHE_FLUSH	_IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)
+
+struct android_pmem_platform_data
+{
+	const char* name;
+	/* starting physical address of memory region */
+	unsigned long start;
+	/* size of memory region */
+	unsigned long size;
+	/* set to indicate the region should not be managed with an allocator */
+	unsigned no_allocator;
+	/* set to indicate maps of this region should be cached, if a mix of
+	 * cached and uncached is desired, set this and open the device with
+	 * O_SYNC to get an uncached region */
+	unsigned cached;
+	/* The MSM7k has bits to enable a write buffer in the bus controller*/
+	unsigned buffered;
+};
+
+struct pmem_region {
+	unsigned long offset;
+	unsigned long len;
+};
+
+#ifdef CONFIG_ANDROID_PMEM
+int is_pmem_file(struct file *file);
+int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
+		  unsigned long *end, struct file **filp);
+int get_pmem_user_addr(struct file *file, unsigned long *start,
+		       unsigned long *end);
+void put_pmem_file(struct file* file);
+void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
+int pmem_setup(struct android_pmem_platform_data *pdata,
+	       long (*ioctl)(struct file *, unsigned int, unsigned long),
+	       int (*release)(struct inode *, struct file *));
+int pmem_remap(struct pmem_region *region, struct file *file,
+	       unsigned operation);
+
+#else
+static inline int is_pmem_file(struct file *file) { return 0; }
+static inline int get_pmem_file(int fd, unsigned long *start,
+				unsigned long *vstart, unsigned long *end,
+				struct file **filp) { return -ENOSYS; }
+static inline int get_pmem_user_addr(struct file *file, unsigned long *start,
+				     unsigned long *end) { return -ENOSYS; }
+static inline void put_pmem_file(struct file* file) { return; }
+static inline void flush_pmem_file(struct file *file, unsigned long start,
+				   unsigned long len) { return; }
+static inline int pmem_setup(struct android_pmem_platform_data *pdata,
+	      long (*ioctl)(struct file *, unsigned int, unsigned long),
+	      int (*release)(struct inode *, struct file *)) { return -ENOSYS; }
+
+static inline int pmem_remap(struct pmem_region *region, struct file *file,
+			     unsigned operation) { return -ENOSYS; }
+#endif
+
+#endif //_ANDROID_PPP_H_
+