[PATCH 02/29] drm/i915/gt: Move execlists_reset() out of line

[Chris Wilson]

Reduce the bulk of execlists_submission_tasklet by moving the unlikely
reset function out of line.

add/remove: 1/0 grow/shrink: 0/1 up/down: 960/-935 (25)
Function                                     old     new   delta
execlists_reset                                -     960    +960
execlists_submission_tasklet                6629    5694    -935

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 .../drm/i915/gt/intel_execlists_submission.c  | 31 +++++++++----------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index e8c20f80e353..3e680bfa9d13 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2293,10 +2293,12 @@ static void execlists_capture(struct intel_engine_cs *engine)
 	kfree(cap);
 }
 
-static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
+static noinline void execlists_reset(struct intel_engine_cs *engine)
 {
 	const unsigned int bit = I915_RESET_ENGINE + engine->id;
 	unsigned long *lock = &engine->gt->reset.flags;
+	unsigned long eir = fetch_and_zero(&engine->execlists.error_interrupt);
+	const char *msg;
 
 	if (!intel_has_reset_engine(engine->gt))
 		return;
@@ -2304,6 +2306,15 @@ static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
 	if (test_and_set_bit(bit, lock))
 		return;
 
+	/* Generate the error message in priority wrt to the user! */
+	if (eir & GENMASK(15, 0))
+		msg = "CS error"; /* thrown by a user payload */
+	else if (eir & ERROR_CSB)
+		msg = "invalid CSB event";
+	else if (eir & ERROR_PREEMPT)
+		msg = "preemption time out";
+	else
+		msg = "internal error";
 	ENGINE_TRACE(engine, "reset for %s\n", msg);
 
 	/* Mark this tasklet as disabled to avoid waiting for it to complete */
@@ -2349,22 +2360,8 @@ static void execlists_submission_tasklet(unsigned long data)
 		engine->execlists.error_interrupt |= ERROR_PREEMPT;
 	}
 
-	if (unlikely(READ_ONCE(engine->execlists.error_interrupt))) {
-		const char *msg;
-
-		/* Generate the error message in priority wrt to the user! */
-		if (engine->execlists.error_interrupt & GENMASK(15, 0))
-			msg = "CS error"; /* thrown by a user payload */
-		else if (engine->execlists.error_interrupt & ERROR_CSB)
-			msg = "invalid CSB event";
-		else if (engine->execlists.error_interrupt & ERROR_PREEMPT)
-			msg = "preemption time out";
-		else
-			msg = "internal error";
-
-		engine->execlists.error_interrupt = 0;
-		execlists_reset(engine, msg);
-	}
+	if (unlikely(READ_ONCE(engine->execlists.error_interrupt)))
+		execlists_reset(engine);
 
 	if (!engine->execlists.pending[0]) {
 		execlists_dequeue_irq(engine);
-- 
2.20.1