This is a note to let you know that I've just added the patch titled
drm/i915: do not clean GT table on error path
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-do-not-clean-gt-table-on-error-path.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e51c0d98dc545636a121110f0809766333338375
Author: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Date: Wed Nov 15 11:54:03 2023 +0100
drm/i915: do not clean GT table on error path
[ Upstream commit 0561794b6b642b84b879bf97061c4b4fa692839e ]
The only task of intel_gt_release_all is to zero gt table. Calling
it on error path prevents intel_gt_driver_late_release_all (called from
i915_driver_late_release) to cleanup GTs, causing leakage.
After i915_driver_late_release GT array is not used anymore so
it does not need cleaning at all.
Sample leak report:
BUG i915_request (...): Objects remaining in i915_request on __kmem_cache_shutdown()
...
Object 0xffff888113420040 @offset=64
Allocated in __i915_request_create+0x75/0x610 [i915] age=18339 cpu=1 pid=1454
kmem_cache_alloc+0x25b/0x270
__i915_request_create+0x75/0x610 [i915]
i915_request_create+0x109/0x290 [i915]
__engines_record_defaults+0xca/0x440 [i915]
intel_gt_init+0x275/0x430 [i915]
i915_gem_init+0x135/0x2c0 [i915]
i915_driver_probe+0x8d1/0xdc0 [i915]
v2: removed whole intel_gt_release_all
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8489
Fixes: bec68cc9ea42 ("drm/i915: Prepare for multiple GTs")
Signed-off-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231115-dont_clean_gt_on_error_path-v2-1-54250125470a@xxxxxxxxx
(cherry picked from commit e899505533852bf1da133f2f4c9a9655ff77f7e5)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 449f0b7fc8434..95631e8f39e7b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -967,8 +967,6 @@ int intel_gt_probe_all(struct drm_i915_private *i915)
err:
i915_probe_error(i915, "Failed to initialize %s! (%d)\n", gtdef->name, ret);
- intel_gt_release_all(i915);
-
return ret;
}
@@ -987,15 +985,6 @@ int intel_gt_tiles_init(struct drm_i915_private *i915)
return 0;
}
-void intel_gt_release_all(struct drm_i915_private *i915)
-{
- struct intel_gt *gt;
- unsigned int id;
-
- for_each_gt(gt, i915, id)
- i915->gt[id] = NULL;
-}
-
void intel_gt_info_print(const struct intel_gt_info *info,
struct drm_printer *p)
{
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index ec4d26b3c17cc..8dc5f85b7747b 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -777,7 +777,7 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
ret = i915_driver_mmio_probe(i915);
if (ret < 0)
- goto out_tiles_cleanup;
+ goto out_runtime_pm_put;
ret = i915_driver_hw_probe(i915);
if (ret < 0)
@@ -837,8 +837,6 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
i915_ggtt_driver_late_release(i915);
out_cleanup_mmio:
i915_driver_mmio_release(i915);
-out_tiles_cleanup:
- intel_gt_release_all(i915);
out_runtime_pm_put:
enable_rpm_wakeref_asserts(&i915->runtime_pm);
i915_driver_late_release(i915);
