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drm/i915: Assert that the request is on the execution queue before being removed

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We should only attempt to remove requests from the execution queue that
are on the execution queue. These are the requests that have been
assigned a global_seqno, so we can assert that we only attempt to remove
requests with a nonzero global_seqno. Afterwards we assert that we
remove them in order, i.e. the global_seqno matches the engine's seqno,
but that leaves a small loophole for an unattached request on an unused
engine.

We can then make the same assertion on queuing the request to the
execution engine, it must have a zero global_seqno or else we are queuing
the same request twice.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171222141959.3006-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson 2017-12-22 14:19:59 +00:00
parent 193a98dc7c
commit 2d453c7895
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_gem_request.c
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@ -479,6 +479,7 @@ void __i915_gem_request_submit(struct drm_i915_gem_request *request)
/* Transfer from per-context onto the global per-engine timeline */
timeline = engine->timeline;
GEM_BUG_ON(timeline == request->timeline);
GEM_BUG_ON(request->global_seqno);
seqno = timeline_get_seqno(timeline);
GEM_BUG_ON(!seqno);
@ -525,6 +526,7 @@ void __i915_gem_request_unsubmit(struct drm_i915_gem_request *request)
/* Only unwind in reverse order, required so that the per-context list
* is kept in seqno/ring order.
*/
GEM_BUG_ON(!request->global_seqno);
GEM_BUG_ON(request->global_seqno != engine->timeline->seqno);
engine->timeline->seqno--;