drm/xe: Enforce correct user fence signaling order using

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Prevent application hangs caused by out-of-order fence signaling when
user fences are attached. Use drm_syncobj (via dma-fence-chain) to
guarantee that each user fence signals in order, regardless of the
signaling order of the attached fences. Ensure user fence writebacks to
user space occur in the correct sequence.

v7:
 - Skip drm_syncbj create of error (CI)

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patch.msgid.link/20251031234050.3043507-2-matthew.brost@intel.com
(cherry picked from commit adda4e855a)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

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Matthew Brost 2025-10-31 16:40:45 -07:00 • committed by Lucas De Marchi

parent b11a020d91

commit 0995c2fc39

9 changed files with 86 additions and 18 deletions

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3

drivers/gpu/drm/xe/xe_exec.c

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drivers/gpu/drm/xe/xe_exec_queue.c

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drivers/gpu/drm/xe/xe_exec_queue_types.h

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drivers/gpu/drm/xe/xe_oa.c

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drivers/gpu/drm/xe/xe_oa_types.h

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drivers/gpu/drm/xe/xe_sync.c

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drivers/gpu/drm/xe/xe_sync.h

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drivers/gpu/drm/xe/xe_sync_types.h

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drivers/gpu/drm/xe/xe_vm.c

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