<snip>
+
+#define GUC_PREEMPT_FINISHED 0x1
+#define GUC_PREEMPT_BREADCRUMB_DWORDS 0x8
+static void inject_preempt_context(struct work_struct *work)
+{
+ struct guc_preempt_work *preempt_work =
+ container_of(work, typeof(*preempt_work), work);
+ struct intel_engine_cs *engine = preempt_work->engine;
+ struct intel_guc *guc = &engine->i915->guc;
+ struct i915_guc_client *client = guc->client[PREEMPT];
+ struct intel_ring *ring = client->owner->engine[engine->id].ring;
+ u32 ctx_desc = lower_32_bits(intel_lr_context_descriptor(client->owner,
+ engine));
+ u32 *cs = ring->vaddr + ring->tail;
+ u32 data[7];
+
+ if (engine->id == RCS) {
+ cs = gen8_emit_ggtt_write_rcs(cs, GUC_PREEMPT_FINISHED,
+ intel_hws_preempt_done_address(engine));
+ } else {
+ cs = gen8_emit_ggtt_write(cs, GUC_PREEMPT_FINISHED,
+ intel_hws_preempt_done_address(engine));
+ *cs++ = MI_NOOP;
+ *cs++ = MI_NOOP;
+ }
+ *cs++ = MI_USER_INTERRUPT;
+ *cs++ = MI_NOOP;
+
+ GEM_BUG_ON(!IS_ALIGNED(ring->size,
+ GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32)));
+ GEM_BUG_ON((void*)cs - (ring->vaddr + ring->tail) !=
+ GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32));
+
+ ring->tail += GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32);
+ ring->tail &= (ring->size - 1);
+
+ flush_ggtt_writes(ring->vma);
+
+ spin_lock_irq(&client->wq_lock);
+ guc_wq_item_append(client, engine->guc_id, ctx_desc,
+ ring->tail / sizeof(u64), 0);
+ spin_unlock_irq(&client->wq_lock);
+
+ data[0] = INTEL_GUC_ACTION_REQUEST_PREEMPTION;
+ data[1] = client->stage_id;
+ data[2] = INTEL_GUC_PREEMPT_OPTION_IMMEDIATE |
I was looking at how the GuC handles these flags and from what I've seen
INTEL_GUC_PREEMPT_OPTION_IMMEDIATE doesn't seem to be used anywhere in
GuC FW anymore (even if it still exist in the interface), so I believe
it should be safe to drop it.
Daniele
+ INTEL_GUC_PREEMPT_OPTION_DROP_WORK_Q |
+ INTEL_GUC_PREEMPT_OPTION_DROP_SUBMIT_Q;
+ data[3] = engine->guc_id;
+ data[4] = guc->client[SUBMIT]->priority;
+ data[5] = guc->client[SUBMIT]->stage_id;
+ data[6] = guc_ggtt_offset(guc->shared_data);
+
+ if (WARN_ON(intel_guc_send(guc, data, ARRAY_SIZE(data)))) {
+ WRITE_ONCE(engine->execlists.preempt, false);
+ tasklet_schedule(&engine->execlists.irq_tasklet);
+ }
+}
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