All of lore.kernel.org
 help / color / mirror / Atom feed
From: Matthew Brost <matthew.brost@intel.com>
To: <intel-gfx@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>
Cc: daniele.ceraolospurio@intel.com, john.c.harrison@intel.com
Subject: [PATCH] drm/i915/guc: Remove racey GEM_BUG_ON
Date: Thu,  9 Dec 2021 10:51:41 -0800	[thread overview]
Message-ID: <20211209185141.21292-1-matthew.brost@intel.com> (raw)

A full GT can race with the last context put resulting in the context
ref count being zero but the destroyed bit not yet being set. Remove
GEM_BUG_ON in scrub_guc_desc_for_outstanding_g2h that asserts the
destroyed bit must be set in ref count is zero.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 --
 1 file changed, 2 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 9b7b4f4e0d91..0f99bb83293a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1040,8 +1040,6 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc)
 
 		spin_unlock(&ce->guc_state.lock);
 
-		GEM_BUG_ON(!do_put && !destroyed);
-
 		if (pending_enable || destroyed || deregister) {
 			decr_outstanding_submission_g2h(guc);
 			if (deregister)
-- 
2.33.1


WARNING: multiple messages have this Message-ID (diff)
From: Matthew Brost <matthew.brost@intel.com>
To: <intel-gfx@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>
Subject: [Intel-gfx] [PATCH] drm/i915/guc: Remove racey GEM_BUG_ON
Date: Thu,  9 Dec 2021 10:51:41 -0800	[thread overview]
Message-ID: <20211209185141.21292-1-matthew.brost@intel.com> (raw)

A full GT can race with the last context put resulting in the context
ref count being zero but the destroyed bit not yet being set. Remove
GEM_BUG_ON in scrub_guc_desc_for_outstanding_g2h that asserts the
destroyed bit must be set in ref count is zero.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 --
 1 file changed, 2 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 9b7b4f4e0d91..0f99bb83293a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1040,8 +1040,6 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc)
 
 		spin_unlock(&ce->guc_state.lock);
 
-		GEM_BUG_ON(!do_put && !destroyed);
-
 		if (pending_enable || destroyed || deregister) {
 			decr_outstanding_submission_g2h(guc);
 			if (deregister)
-- 
2.33.1


             reply	other threads:[~2021-12-09 18:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-09 18:51 Matthew Brost [this message]
2021-12-09 18:51 ` [Intel-gfx] [PATCH] drm/i915/guc: Remove racey GEM_BUG_ON Matthew Brost
2021-12-09 19:26 ` Daniele Ceraolo Spurio
2021-12-09 19:26   ` [Intel-gfx] " Daniele Ceraolo Spurio
2021-12-09 19:57   ` Matthew Brost
2021-12-09 19:57     ` [Intel-gfx] " Matthew Brost
2021-12-09 20:04     ` Daniele Ceraolo Spurio
2021-12-09 20:04       ` [Intel-gfx] " Daniele Ceraolo Spurio
2021-12-10  9:09 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2021-12-11  0:19 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211209185141.21292-1-matthew.brost@intel.com \
    --to=matthew.brost@intel.com \
    --cc=daniele.ceraolospurio@intel.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=john.c.harrison@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.