drm/xe: Use ordered wq for preempt fence waiting

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Preempt fences can sleep waiting for an exec queue suspend operation to
complete. If the system_unbound_wq is used for waiting and the number of
waiters exceeds max_active this will result in other users of the
system_unbound_wq getting starved. Use a device private work queue for
preempt fences to avoid starvation of the system_unbound_wq.

Even though suspend operations can complete out-of-order, all suspend
operations within a VM need to complete before the preempt rebind worker
can start. With that, use a device private ordered wq for preempt fence
waiting.

v2:
 - Add comment about cleanup on failure (Matt R)
 - Update commit message (Lucas)

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240401221913.139672-2-matthew.brost@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

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Matthew Brost 2024-04-01 15:19:11 -07:00 • committed by Lucas De Marchi

parent 9f18b55b6d

commit 37c15c4aae

3 changed files with 14 additions and 2 deletions

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11

drivers/gpu/drm/xe/xe_device.c

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3

drivers/gpu/drm/xe/xe_device_types.h

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2

drivers/gpu/drm/xe/xe_preempt_fence.c

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