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drm/i915: Prevent lock-cycles between GPU waits and GPU resets

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We cannot allow ourselves to wait on the GPU while holding any lock as we
may need to reset the GPU. While there is not an explicit lock between
the two operations, lockdep cannot detect the dependency. So let's tell
lockdep about the wait/reset dependency with an explicit lockmap.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190612085246.16374-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-06-12 09:52:46 +01:00
parent ea60f4bdc4
commit 33df8a7697
5 changed files with 19 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_request.c
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@@ -1444,6 +1444,7 @@ long i915_request_wait(struct i915_request *rq,
return -ETIME;
trace_i915_request_wait_begin(rq, flags);
lock_map_acquire(&rq->i915->gt.reset_lockmap);
/*
* Optimistic spin before touching IRQs.
@@ -1517,6 +1518,7 @@ long i915_request_wait(struct i915_request *rq,
dma_fence_remove_callback(&rq->fence, &wait.cb);
out:
lock_map_release(&rq->i915->gt.reset_lockmap);
trace_i915_request_wait_end(rq);
return timeout;
}