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authorKeith Packard <keithp@keithp.com>2008-10-14 17:19:38 -0700
committerDave Airlie <airlied@linux.ie>2008-10-18 07:10:53 +1000
commit0cdad7e88a23910a911a3339ff2d70f8f952d7b8 (patch)
treeb2c9126690b89d41c8a6878dd046be41eb014627 /drivers
parent630681d9a5314e6cf53d144f7f58b7c19862a7d3 (diff)
i915: Use non-reserved status page index for breadcrumb
Dwords 0 through 0x1f are reserved for use by the hardware. Move the GEM breadcrumb from 0x10 to 0x20 to keep out of this area. Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 74011235f2c..da7c0072ad4 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -597,16 +597,18 @@ extern void opregion_enable_asle(struct drm_device *dev);
* MI_STORE_DATA_IMM.
*
* The following dwords have a reserved meaning:
- * 0: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
- * 4: ring 0 head pointer
- * 5: ring 1 head pointer (915-class)
- * 6: ring 2 head pointer (915-class)
+ * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
+ * 0x04: ring 0 head pointer
+ * 0x05: ring 1 head pointer (915-class)
+ * 0x06: ring 2 head pointer (915-class)
+ * 0x10-0x1b: Context status DWords (GM45)
+ * 0x1f: Last written status offset. (GM45)
*
- * The area from dword 0x10 to 0x3ff is available for driver usage.
+ * The area from dword 0x20 to 0x3ff is available for driver usage.
*/
#define READ_HWSP(dev_priv, reg) (((volatile u32*)(dev_priv->hw_status_page))[reg])
#define READ_BREADCRUMB(dev_priv) READ_HWSP(dev_priv, 5)
-#define I915_GEM_HWS_INDEX 0x10
+#define I915_GEM_HWS_INDEX 0x20
extern int i915_wait_ring(struct drm_device * dev, int n, const char *caller);