On ke, 2016-04-06 at 13:33 +0100, Chris Wilson wrote:
> 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@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> ---
> 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));
>
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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