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drm/i915: Assert requests within a context are submitted in order

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Check the flow of requests into the hardware to verify that are
submitted in order along their timeline.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200306071614.2846708-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-03-06 07:16:12 +00:00
parent 2920516b2f
commit 1eaa251b66
2 changed files with 15 additions and 0 deletions
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11
drivers/gpu/drm/i915/i915_request.c
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@@ -737,6 +737,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
RCU_INIT_POINTER(rq->timeline, tl);
RCU_INIT_POINTER(rq->hwsp_cacheline, tl->hwsp_cacheline);
rq->hwsp_seqno = tl->hwsp_seqno;
GEM_BUG_ON(i915_request_completed(rq));
rq->rcustate = get_state_synchronize_rcu(); /* acts as smp_mb() */
@@ -1284,6 +1285,16 @@ __i915_request_add_to_timeline(struct i915_request *rq)
prev = to_request(__i915_active_fence_set(&timeline->last_request,
&rq->fence));
if (prev && !i915_request_completed(prev)) {
/*
* The requests are supposed to be kept in order. However,
* we need to be wary in case the timeline->last_request
* is used as a barrier for external modification to this
* context.
*/
GEM_BUG_ON(prev->context == rq->context &&
i915_seqno_passed(prev->fence.seqno,
rq->fence.seqno));
if (is_power_of_2(prev->engine->mask | rq->engine->mask))
i915_sw_fence_await_sw_fence(&rq->submit,
&prev->submit,