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* [Intel-gfx] [PATCH] drm/i915/gt: Always reset the engine, even if inactive, on execlists failure
@ 2020-07-11  9:13 Chris Wilson
  2020-07-11  9:56 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Chris Wilson @ 2020-07-11  9:13 UTC (permalink / raw)
  To: intel-gfx; +Cc: Chris Wilson

If something has gone awry with the CSB processing, we need to pause,
unwind and restart the request submission and event processing. However,
currently we skip the engine reset if we raise an error but discover no
active context, in the mistaken belief that it was merely a glitch in
the matrix. The glitches are real enough, and we do need to unwind even
if the engine appears idle (as it has gone permanently idle!) The
simplest way to unwind and recover is simply do the engine reset, which
should be very fast and _safe_ as nothing is active.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index cd4262cc96e2..3ea05a86dc95 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3029,12 +3029,12 @@ static u32 active_ccid(struct intel_engine_cs *engine)
 	return ENGINE_READ_FW(engine, RING_EXECLIST_STATUS_HI);
 }
 
-static bool execlists_capture(struct intel_engine_cs *engine)
+static void execlists_capture(struct intel_engine_cs *engine)
 {
 	struct execlists_capture *cap;
 
 	if (!IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR))
-		return true;
+		return;
 
 	/*
 	 * We need to _quickly_ capture the engine state before we reset.
@@ -3043,7 +3043,7 @@ static bool execlists_capture(struct intel_engine_cs *engine)
 	 */
 	cap = capture_regs(engine);
 	if (!cap)
-		return true;
+		return;
 
 	spin_lock_irq(&engine->active.lock);
 	cap->rq = active_context(engine, active_ccid(engine));
@@ -3080,14 +3080,13 @@ static bool execlists_capture(struct intel_engine_cs *engine)
 
 	INIT_WORK(&cap->work, execlists_capture_work);
 	schedule_work(&cap->work);
-	return true;
+	return;
 
 err_rq:
 	i915_request_put(cap->rq);
 err_free:
 	i915_gpu_coredump_put(cap->error);
 	kfree(cap);
-	return false;
 }
 
 static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
@@ -3107,10 +3106,8 @@ static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
 	tasklet_disable_nosync(&engine->execlists.tasklet);
 
 	ring_set_paused(engine, 1); /* Freeze the current request in place */
-	if (execlists_capture(engine))
-		intel_engine_reset(engine, msg);
-	else
-		ring_set_paused(engine, 0);
+	execlists_capture(engine);
+	intel_engine_reset(engine, msg);
 
 	tasklet_enable(&engine->execlists.tasklet);
 	clear_and_wake_up_bit(bit, lock);
-- 
2.20.1

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^ permalink raw reply related	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-07-13  9:34 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-11  9:13 [Intel-gfx] [PATCH] drm/i915/gt: Always reset the engine, even if inactive, on execlists failure Chris Wilson
2020-07-11  9:56 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2020-07-11 11:16 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
2020-07-13  9:34 ` [Intel-gfx] [PATCH] " Mika Kuoppala

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