drm/nouveau/fifo/gf100-: recover from host mmu faults

This has been on the TODO list for a while now, recovering from things
such as attempting to execute a push buffer or touch a semaphore in an
unmapped memory area.

The only thing required on the HW side here is that the offending
channel is removed from the runlist, and *not* a full reset of PFIFO.

This used to be a bit messier to handle before the rework to make use
of engine topology info, but is apparently now trivial.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
index 352a0baec84d..ec68ea9747d5 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
@@ -180,7 +180,8 @@ gf100_fifo_recover(struct gf100_fifo *fifo, struct nvkm_engine *engine,
 	list_del_init(&chan->head);
 	chan->killed = true;
 
-	fifo->recover.mask |= 1ULL << engine->subdev.index;
+	if (engine != &fifo->base.engine)
+		fifo->recover.mask |= 1ULL << engine->subdev.index;
 	schedule_work(&fifo->recover.work);
 }