From 7566660be5f3dfb132075d5037ba5f674f3c980b Mon Sep 17 00:00:00 2001
From: Matthew Brost <matthew.brost@intel.com>
Date: Thu, 20 Jan 2022 20:31:18 -0800
Subject: drm/i915/guc: Flush G2H handler during a GT reset
Git-commit: 5fe0fdd23e3379833f4346b49fa791733c22ed29
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Now that the error capture is fully decoupled from fence signalling
(request retirement to free memory, which in turn depends on resets) we
can safely flush the G2H handler during a GT reset. This eliminates
corner cases where GuC generated G2H (e.g. engine resets) race with a GT
reset.
v2:
(John Harrison)
- Fix typo in commit message (s/is/in)
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220121043118.24886-4-matthew.brost@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 18 +-----------------
1 file changed, 1 insertion(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 4a0cf42c90b6..9d6b87961334 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1476,8 +1476,6 @@ static void guc_flush_destroyed_contexts(struct intel_guc *guc);
void intel_guc_submission_reset_prepare(struct intel_guc *guc)
{
- int i;
-
if (unlikely(!guc_submission_initialized(guc))) {
/* Reset called during driver load? GuC not yet initialised! */
return;
@@ -1494,21 +1492,7 @@ void intel_guc_submission_reset_prepare(struct intel_guc *guc)
guc_flush_submissions(guc);
guc_flush_destroyed_contexts(guc);
-
- /*
- * Handle any outstanding G2Hs before reset. Call IRQ handler directly
- * each pass as interrupt have been disabled. We always scrub for
- * outstanding G2H as it is possible for outstanding_submission_g2h to
- * be incremented after the context state update.
- */
- for (i = 0; i < 4 && atomic_read(&guc->outstanding_submission_g2h); ++i) {
- intel_guc_to_host_event_handler(guc);
-#define wait_for_reset(guc, wait_var) \
- intel_guc_wait_for_pending_msg(guc, wait_var, false, (HZ / 20))
- do {
- wait_for_reset(guc, &guc->outstanding_submission_g2h);
- } while (!list_empty(&guc->ct.requests.incoming));
- }
+ flush_work(&guc->ct.requests.worker);
scrub_guc_desc_for_outstanding_g2h(guc);
}
--
2.38.1