drm/i915: announce to userspace that the bsd ring is coherent (bbf0c6b3) · Commits · 戴 / test

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>

drivers/gpu/drm/i915/i915_dma.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

include/drm/i915_drm.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;

Admin message