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drm/i915: Delay semaphore submission until the start of the signaler

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Currently we submit the semaphore busywait as soon as the signaler is
submitted to HW. However, we may submit the signaler as the tail of a
batch of requests, and even not as the first context in the HW list,
i.e. the busywait may start spinning far in advance of the signaler even
starting.

If we wait until the request before the signaler is completed before
submitting the busywait, we prevent the busywait from starting too
early, if the signaler is not first in submission port.

To handle the case where the signaler is at the start of the second (or
later) submission port, we will need to delay the execution callback
until we know the context is promoted to port0. A challenge for later.

Fixes: e886196469 ("drm/i915: Use HW semaphores for inter-engine synchronisation on gen8+")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190501114541.10077-9-chris@chris-wilson.co.uk
(cherry picked from commit 0d90ccb702)
[Joonas: edited Fixes: tag into single line.]
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2019-05-01 12:45:36 +01:00 committed by Joonas Lahtinen
parent 9628e15ca9
commit e766fde651
1 changed files with 19 additions and 0 deletions
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19
drivers/gpu/drm/i915/i915_request.c
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@ -798,6 +798,21 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
return ERR_PTR(ret);
}
static int
i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
{
if (list_is_first(&signal->ring_link, &signal->ring->request_list))
return 0;
signal = list_prev_entry(signal, ring_link);
if (i915_timeline_sync_is_later(rq->timeline, &signal->fence))
return 0;
return i915_sw_fence_await_dma_fence(&rq->submit,
&signal->fence, 0,
I915_FENCE_GFP);
}
static int
emit_semaphore_wait(struct i915_request *to,
struct i915_request *from,
@ -816,6 +831,10 @@ emit_semaphore_wait(struct i915_request *to,
&from->fence, 0,
I915_FENCE_GFP);
err = i915_request_await_start(to, from);
if (err < 0)
return err;
err = i915_sw_fence_await_dma_fence(&to->semaphore,
&from->fence, 0,
I915_FENCE_GFP);