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 <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460010558-10705-6-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 69852ac..0e64900 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2566,6 +2566,14 @@
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));