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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>
This commit is contained in:
Keith Packard 2008-10-14 17:19:38 -07:00 committed by Dave Airlie
parent 630681d9a5
commit 0cdad7e88a
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/i915/i915_drv.h
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@ -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);