drm/i915: Fix a lockdep warning at error capture

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For some platfroms we use stop_machine version of
gen8_ggtt_insert_page/gen8_ggtt_insert_entries to avoid a
concurrent GGTT access bug but this causes a circular locking
dependency warning:

  Possible unsafe locking scenario:
        CPU0                    CPU1
        ----                    ----
   lock(&ggtt->error_mutex);
                                lock(dma_fence_map);
                                lock(&ggtt->error_mutex);
   lock(cpu_hotplug_lock);

Fix this by calling gen8_ggtt_insert_page/gen8_ggtt_insert_entries
directly at error capture which is concurrent GGTT access safe because
reset path make sure of that.

v2: Fix rebase conflict and added a comment.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5595
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220624110821.29190-1-nirmoy.das@intel.com

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This commit is contained in:

Nirmoy Das 2022-06-24 13:08:21 +02:00 • committed by Ramalingam C

parent 58eaa6b3fb

commit a069685637

4 changed files with 29 additions and 3 deletions

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10

drivers/gpu/drm/i915/gt/intel_ggtt.c

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9

drivers/gpu/drm/i915/gt/intel_gtt.h

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5

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

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8

drivers/gpu/drm/i915/i915_gpu_error.c

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