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drm/i915: announce to userspace that the bsd ring is coherent

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Otherwise we can't really fix the abi-braindeadness of forcing
libva to manually wait for rendering when switching rings. Which
in turn makes implementing hw semaphores a pointless exercise
(at least for ironlake).

[Also added the relaxed fencing param to explain the jump in
numbering - relaxed fencing is in -next.]

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Daniel Vetter 2010-12-05 11:30:40 +01:00 committed by Chris Wilson
parent 136711be41
commit bbf0c6b362
2 changed files with 5 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_dma.c
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@ -767,6 +767,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
case I915_PARAM_HAS_BLT:
value = HAS_BLT(dev);
break;
case I915_PARAM_HAS_COHERENT_RINGS:
value = 1;
break;
default:
DRM_DEBUG_DRIVER("Unknown parameter %d\n",
param->param);

2
include/drm/i915_drm.h
View File

@ -287,6 +287,8 @@ typedef struct drm_i915_irq_wait {
#define I915_PARAM_HAS_EXECBUF2 9
#define I915_PARAM_HAS_BSD 10
#define I915_PARAM_HAS_BLT 11
#define I915_PARAM_HAS_RELAXED_FENCING 12
#define I915_PARAM_HAS_COHERENT_RINGS 13
typedef struct drm_i915_getparam {
int param;