From a058d9348244047189ff1aabaeb2ebcffa899cb3 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 7 Apr 2016 07:29:15 +0100 Subject: [PATCH] drm/i915: Reset semaphore page for gen8 An oversight is that when we wrap the seqno, we need to reset the hw semaphore counters to 0. We did this for gen6 and gen7 and forgot to do so for the new implementation required for gen8 (legacy). Signed-off-by: Chris Wilson Cc: Mika Kuoppala Cc: Joonas Lahtinen Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/1460010558-10705-6-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_ringbuffer.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 69852ac4018d..0e6490074011 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2566,6 +2566,14 @@ void intel_ring_init_seqno(struct intel_engine_cs *engine, u32 seqno) if (HAS_VEBOX(dev_priv)) I915_WRITE(RING_SYNC_2(engine->mmio_base), 0); } + if (dev_priv->semaphore_obj) { + struct drm_i915_gem_object *obj = dev_priv->semaphore_obj; + struct page *page = i915_gem_object_get_dirty_page(obj, 0); + void *semaphores = kmap(page); + memset(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0), + 0, I915_NUM_ENGINES * gen8_semaphore_seqno_size); + kunmap(page); + } memset(engine->semaphore.sync_seqno, 0, sizeof(engine->semaphore.sync_seqno)); -- 2.20.1