From abd7038e5a814bb29398d6ea259815b293c62a2b Mon Sep 17 00:00:00 2001
From: Ben Widawsky <ben@bwidawsk.net>
Date: Thu, 28 Jul 2011 13:42:45 -0700
Subject: intel-gpu-tools/range handling: register range handling

Hooks to allow safe accesses from userspace. Can revert to old behavior
by using unsafe access.
---
 lib/Makefile.am       |  1 +
 lib/intel_chipset.h   |  8 ++++++++
 lib/intel_gpu_tools.h | 23 ++++++++++++++++++++++-
 lib/intel_mmio.c      | 39 ++++++++++++++++++++++++++++++++++++++-
 4 files changed, 69 insertions(+), 2 deletions(-)

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 0c9380d5..4612cd53 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -8,6 +8,7 @@ libintel_tools_la_SOURCES = \
 	intel_mmio.c \
 	intel_pci.c \
 	intel_reg.h \
+	intel_reg_map.c \
 	instdone.c \
 	instdone.h \
 	drmtest.h
diff --git a/lib/intel_chipset.h b/lib/intel_chipset.h
index c3db3abc..a38f661d 100755
--- a/lib/intel_chipset.h
+++ b/lib/intel_chipset.h
@@ -168,3 +168,11 @@
 
 #define HAS_BLT_RING(devid)	(IS_GEN6(devid) || \
 				 IS_GEN7(devid))
+
+#define IS_BROADWATER(devid)	(devid == PCI_CHIP_I946_GZ || \
+				 devid == PCI_CHIP_I965_G_1 || \
+				 devid == PCI_CHIP_I965_Q || \
+				 devid == PCI_CHIP_I965_G)
+
+#define IS_CRESTLINE(devid)	(devid == PCI_CHIP_I965_GM || \
+				 devid == PCI_CHIP_I965_GME)
diff --git a/lib/intel_gpu_tools.h b/lib/intel_gpu_tools.h
index 6b307782..a145fb9b 100644
--- a/lib/intel_gpu_tools.h
+++ b/lib/intel_gpu_tools.h
@@ -38,11 +38,32 @@ extern void *mmio;
 void intel_get_mmio(struct pci_device *pci_dev);
 
 /* New style register access API */
-int intel_register_access_init(struct pci_device *pci_dev);
+int intel_register_access_init(struct pci_device *pci_dev, int safe);
 void intel_register_access_fini(void);
 uint32_t intel_register_read(uint32_t reg);
 void intel_register_write(uint32_t reg, uint32_t val);
 
+#define INTEL_RANGE_RSVD	(0<<0) /*  Shouldn't be read or written */
+#define INTEL_RANGE_READ	(1<<0)
+#define INTEL_RANGE_WRITE	(1<<1)
+#define INTEL_RANGE_RW		(INTEL_RANGE_READ | INTEL_RANGE_WRITE)
+#define INTEL_RANGE_END		(1<<31)
+
+struct intel_register_range {
+	uint32_t base;
+	uint32_t size;
+	uint32_t flags;
+};
+
+struct intel_register_map {
+	struct intel_register_range *map;
+	uint32_t top;
+	uint32_t alignment_mask;
+};
+struct intel_register_map intel_get_register_map(uint32_t devid);
+struct intel_register_range *intel_get_register_range(struct intel_register_map map, uint32_t offset, int mode);
+
+
 static inline uint32_t
 INREG(uint32_t reg)
 {
diff --git a/lib/intel_mmio.c b/lib/intel_mmio.c
index 99d1ffd8..31967d99 100644
--- a/lib/intel_mmio.c
+++ b/lib/intel_mmio.c
@@ -51,6 +51,7 @@ static struct _mmio_data {
 	char debugfs_path[FILENAME_MAX];
 	char debugfs_forcewake_path[FILENAME_MAX];
 	uint32_t i915_devid;
+	struct intel_register_map map;
 	int key;
 } mmio_data;
 
@@ -151,7 +152,7 @@ release_forcewake_lock(int fd)
  * @safe: use safe register access tables
  */
 int
-intel_register_access_init(struct pci_device *pci_dev)
+intel_register_access_init(struct pci_device *pci_dev, int safe)
 {
 	int ret;
 
@@ -164,6 +165,8 @@ intel_register_access_init(struct pci_device *pci_dev)
 	if (mmio_data.inited)
 		return -1;
 
+	mmio_data.safe = safe != 0 ? true : false;
+
 	/* Find where the forcewake lock is */
 	ret = find_debugfs_path("/sys/kernel/debug/dri");
 	if (ret) {
@@ -175,6 +178,8 @@ intel_register_access_init(struct pci_device *pci_dev)
 	}
 
 	mmio_data.i915_devid = pci_dev->device_id;
+	if (mmio_data.safe)
+		mmio_data.map = intel_get_register_map(mmio_data.i915_devid);
 
 	mmio_data.key = get_forcewake_lock();
 	mmio_data.inited++;
@@ -198,6 +203,25 @@ intel_register_read(uint32_t reg)
 
 	if (IS_GEN6(mmio_data.i915_devid))
 		assert(mmio_data.key != -1);
+
+	if (!mmio_data.safe)
+		goto read_out;
+
+	range = intel_get_register_range(mmio_data.map,
+					 reg,
+					 INTEL_RANGE_READ);
+
+	if(!range) {
+		fprintf(stderr, "Register read blocked for safety "
+			"(*0x%08x)\n", reg);
+		ret = 0xffffffff;
+		goto out;
+	}
+
+read_out:
+	ret = *(volatile uint32_t *)((volatile char *)mmio + reg);
+out:
+	return ret;
 }
 
 void
@@ -210,5 +234,18 @@ intel_register_write(uint32_t reg, uint32_t val)
 	if (IS_GEN6(mmio_data.i915_devid))
 		assert(mmio_data.key != -1);
 
+	if (!mmio_data.safe)
+		goto write_out;
+
+	range = intel_get_register_range(mmio_data.map,
+					 reg,
+					 INTEL_RANGE_WRITE);
+
+	if (!range) {
+		fprintf(stderr, "Register write blocked for safety "
+			"(*0x%08x = 0x%x)\n", reg, val);
+	}
+
+write_out:
 	*(volatile uint32_t *)((volatile char *)mmio + reg) = val;
 }
-- 
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