drm/nouveau/fifo/gf100-: protect channel preempt with subdev mutex

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This avoids an issue that occurs when we're attempting to preempt multiple
channels simultaneously.  HW seems to ignore preempt requests while it's
still processing a previous one, which, well, makes sense.

Fixes random "fifo: SCHED_ERROR 0d []" + GPCCS page faults during parallel
piglit runs on (at least) GM107.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org

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This commit is contained in:

Ben Skeggs 2016-11-05 14:33:14 +10:00

parent e137040e0d

commit b27add13f5

2 changed files with 11 additions and 6 deletions

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9

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c

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8

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c

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