drm/i915/gt: Ignore repeated attempts to suspend request flow across reset

Before reseting the engine, we suspend the execution of the guilty
request, so that we can continue execution with a new context while we
slowly compress the captured error state for the guilty context. However,
if the reset fails, we will promptly attempt to reset the same request
again, and discover the ongoing capture. Ignore the second attempt to
suspend and capture the same request.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1168
Fixes: 32ff621fd744 ("drm/i915/gt: Allow temporary suspension of inflight requests")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: <stable@vger.kernel.org> # v5.7+
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201204151234.19729-1-chris@chris-wilson.co.uk
(cherry picked from commit b969540500bce60cf1cdfff5464388af32b9a553)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 0952bf1572346fd1ee73989888680cc06cf898f9..03fd1fa42a75a1f714e6bdacf4c48402d31e1bb8 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2788,6 +2788,9 @@ static void __execlists_hold(struct i915_request *rq)
 static bool execlists_hold(struct intel_engine_cs *engine,
                           struct i915_request *rq)
 {
+       if (i915_request_on_hold(rq))
+               return false;
+
        spin_lock_irq(&engine->active.lock);
 
        if (i915_request_completed(rq)) { /* too late! */