drm/nouveau/fifo/gk104-: ACK SCHED_ERROR before attempting CTXSW_TIMEOUT recovery

static void

gk104_fifo_intr_sched_ctxsw(struct gk104_fifo *fifo)

{

	struct nvkm_device *device = fifo->base.engine.subdev.device;

	unsigned long flags, engm = 0;

	u32 engn;

	/* We need to ACK the SCHED_ERROR here, and prevent it reasserting,

	 * as MMU_FAULT cannot be triggered while it's pending.

	 */

	spin_lock_irqsave(&fifo->base.lock, flags);

	nvkm_mask(device, 0x002140, 0x00000100, 0x00000000);

	nvkm_wr32(device, 0x002100, 0x00000100);

	for (engn = 0; engn < fifo->engine_nr; engn++) {

		struct gk104_fifo_engine_status status;

	for_each_set_bit(engn, &engm, fifo->engine_nr)

		gk104_fifo_recover_engn(fifo, engn);

	nvkm_mask(device, 0x002140, 0x00000100, 0x00000100);

	spin_unlock_irqrestore(&fifo->base.lock, flags);

}