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drm/nouveau/fifo/gk104-: trigger mmu fault before attempting engine recovery 

Greatly improves the chances of recovering the GPU from a CTXSW_TIMEOUT.

Tested with piglit's arb_shader_image_load_store-atomicity, which causes
GR to hang in such a way that recovery failed (CTXSW_TIMEOUT continually
re-triggers).

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2017-01-18 15:37:24 +10:00
parent 03f16f5f27
commit 3ebef76a1d
1 changed files with 41 additions and 0 deletions
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41
drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
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@ -280,10 +280,13 @@ gk104_fifo_recover_chan(struct nvkm_fifo *base, int chid)
static void
gk104_fifo_recover_engn(struct gk104_fifo *fifo, int engn)
{
struct nvkm_engine *engine = fifo->engine[engn].engine;
struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
struct nvkm_device *device = subdev->device;
const u32 runl = fifo->engine[engn].runl;
const u32 engm = BIT(engn);
struct gk104_fifo_engine_status status;
int mmui = -1;
assert_spin_locked(&fifo->base.lock);
if (fifo->recover.engm & engm)
@ -300,6 +303,44 @@ gk104_fifo_recover_engn(struct gk104_fifo *fifo, int engn)
gk104_fifo_recover_chan(&fifo->base, status.chan->id);
}
/* Determine MMU fault ID for the engine, if we're not being
* called from the fault handler already.
*/
if (!status.faulted && engine) {
mmui = nvkm_top_fault_id(device, engine->subdev.index);
if (mmui < 0) {
const struct nvkm_enum *en = fifo->func->fault.engine;
for (; en && en->name; en++) {
if (en->data2 == engine->subdev.index) {
mmui = en->value;
break;
}
}
}
WARN_ON(mmui < 0);
}
/* Trigger a MMU fault for the engine.
*
* No good idea why this is needed, but nvgpu does something similar,
* and it makes recovery from CTXSW_TIMEOUT a lot more reliable.
*/
if (mmui >= 0) {
nvkm_wr32(device, 0x002a30 + (engn * 0x04), 0x00000100 | mmui);
/* Wait for fault to trigger. */
nvkm_msec(device, 2000,
gk104_fifo_engine_status(fifo, engn, &status);
if (status.faulted)
break;
);
/* Release MMU fault trigger, and ACK the fault. */
nvkm_wr32(device, 0x002a30 + (engn * 0x04), 0x00000000);
nvkm_wr32(device, 0x00259c, BIT(mmui));
nvkm_wr32(device, 0x002100, 0x10000000);
}
/* Schedule recovery. */
nvkm_warn(subdev, "engine %d: scheduled for recovery\n", engn);
schedule_work(&fifo->recover.work);