drm/radeon: command stream checker for r3xx-r5xx hardware

For security purpose we want to make sure the userspace process doesn't
access memory beyond buffer it owns. To achieve this we need to check
states the userspace program. For color buffer and zbuffer we check that
the clipping register will discard access beyond buffers set as color
or zbuffer. For vertex buffer we check that no vertex fetch will happen
beyond buffer end. For texture we check various texture states (number
of mipmap level, texture size, texture depth, ...) to compute the amount
of memory the texture fetcher might access.

The command stream checking impact the performances so far quick benchmark
shows an average of 3% decrease in fps of various applications. It can
be optimized a bit more by caching result of checking and thus avoid a
full recheck if no states changed since last check.

Note that this patch is still incomplete on checking side as it doesn't
check 2d rendering states.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index c3f24cc56009..d61f2fc61df5 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -51,7 +51,7 @@
 
 #include "radeon_mode.h"
 #include "radeon_reg.h"
-
+#include "r300.h"
 
 /*
  * Modules parameters.
@@ -496,6 +496,7 @@ int r100_debugfs_cp_init(struct radeon_device *rdev);
  * ASIC specific functions.
  */
 struct radeon_asic {
+        int (*init)(struct radeon_device *rdev);
         void (*errata)(struct radeon_device *rdev);
         void (*vram_info)(struct radeon_device *rdev);
         int (*gpu_reset)(struct radeon_device *rdev);
@@ -536,6 +537,10 @@ struct radeon_asic {
         void (*set_clock_gating)(struct radeon_device *rdev, int enable);
 };
 
+union radeon_asic_config {
+        struct r300_asic        r300;
+};
+
 
 /*
  * IOCTL.
@@ -573,6 +578,7 @@ struct radeon_device {
         struct drm_device               *ddev;
         struct pci_dev                  *pdev;
         /* ASIC */
+        union radeon_asic_config        config;
         enum radeon_family              family;
         unsigned long                   flags;
         int                             usec_timeout;
@@ -763,6 +769,7 @@ static inline void radeon_ring_write(struct radeon_device *rdev, uint32_t v)
 /*
  * ASICs macro.
  */
+#define radeon_init(rdev) (rdev)->asic->init((rdev))
 #define radeon_cs_parse(p) rdev->asic->cs_parse((p))
 #define radeon_errata(rdev) (rdev)->asic->errata((rdev))
 #define radeon_vram_info(rdev) (rdev)->asic->vram_info((rdev))