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linux/drivers/gpu
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Matthew Brost cdc8a1e11f
drm/xe: Do not preempt fence signaling CS instructions 
If a batch buffer is complete, it makes little sense to preempt the
fence signaling instructions in the ring, as the largest portion of the
work (the batch buffer) is already done and fence signaling consists of
only a few instructions. If these instructions are preempted, the GuC
would need to perform a context switch just to signal the fence, which
is costly and delays fence signaling. Avoid this scenario by disabling
preemption immediately after the BB start instruction and re-enabling it
after executing the fence signaling instructions.

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Carlos Santa <carlos.santa@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patch.msgid.link/20260115004546.58060-1-matthew.brost@intel.com
(cherry picked from commit 2bcbf2dcde0c839a73af664a3c77d4e77d58a3eb)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
2026-03-02 11:12:28 -05:00
..
drm drm/xe: Do not preempt fence signaling CS instructions 2026-03-02 11:12:28 -05:00
host1x Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
ipu-v3 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
nova-core Driver core changes for 7.0-rc1 2026-02-11 17:43:59 -08:00
trace
vga Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
Makefile