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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
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
View File

@ -60,6 +60,7 @@ gf100_fifo_gpfifo_engine_fini(struct nvkm_fifo_chan *base,
struct nvkm_gpuobj *inst = chan->base.inst;
int ret = 0;
mutex_lock(&subdev->mutex);
nvkm_wr32(device, 0x002634, chan->base.chid);
if (nvkm_msec(device, 2000,
if (nvkm_rd32(device, 0x002634) == chan->base.chid)
@ -67,10 +68,12 @@ gf100_fifo_gpfifo_engine_fini(struct nvkm_fifo_chan *base,
) < 0) {
nvkm_error(subdev, "channel %d [%s] kick timeout\n",
chan->base.chid, chan->base.object.client->name);
ret = -EBUSY;
if (suspend)
return ret;
ret = -ETIMEDOUT;
}
mutex_unlock(&subdev->mutex);
if (ret && suspend)
return ret;
if (offset) {
nvkm_kmap(inst);

8
drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c
View File

@ -40,7 +40,9 @@ gk104_fifo_gpfifo_kick(struct gk104_fifo_chan *chan)
struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
struct nvkm_device *device = subdev->device;
struct nvkm_client *client = chan->base.object.client;
int ret = 0;
mutex_lock(&subdev->mutex);
nvkm_wr32(device, 0x002634, chan->base.chid);
if (nvkm_msec(device, 2000,
if (!(nvkm_rd32(device, 0x002634) & 0x00100000))
@ -48,10 +50,10 @@ gk104_fifo_gpfifo_kick(struct gk104_fifo_chan *chan)
) < 0) {
nvkm_error(subdev, "channel %d [%s] kick timeout\n",
chan->base.chid, client->name);
return -EBUSY;
ret = -ETIMEDOUT;
}
return 0;
mutex_unlock(&subdev->mutex);
return ret;
}
static u32