return intel_guc_slpc_is_used(guc);
}
+static int guc_sched_disable_delay_ms_get(void *data, u64 *val)
+{
+ struct intel_guc *guc = data;
+
+ if (!intel_guc_submission_is_used(guc))
+ return -ENODEV;
+
+ *val = guc->submission_state.sched_disable_delay_ms;
+
+ return 0;
+}
+
+static int guc_sched_disable_delay_ms_set(void *data, u64 val)
+{
+ struct intel_guc *guc = data;
+
+ if (!intel_guc_submission_is_used(guc))
+ return -ENODEV;
+
+ guc->submission_state.sched_disable_delay_ms = val;
+
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(guc_sched_disable_delay_ms_fops,
+ guc_sched_disable_delay_ms_get,
+ guc_sched_disable_delay_ms_set, "%lld\n");
+
+static int guc_sched_disable_gucid_threshold_get(void *data, u64 *val)
+{
+ struct intel_guc *guc = data;
+
+ if (!intel_guc_submission_is_used(guc))
+ return -ENODEV;
+
+ *val = guc->submission_state.sched_disable_gucid_threshold;
+ return 0;
+}
+
+static int guc_sched_disable_gucid_threshold_set(void *data, u64 val)
+{
+ struct intel_guc *guc = data;
+
+ if (!intel_guc_submission_is_used(guc))
+ return -ENODEV;
+
+ if (val > intel_guc_sched_disable_gucid_threshold_max(guc))
+ guc->submission_state.sched_disable_gucid_threshold =
+ intel_guc_sched_disable_gucid_threshold_max(guc);
+ else
+ guc->submission_state.sched_disable_gucid_threshold = val;
+
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(guc_sched_disable_gucid_threshold_fops,
+ guc_sched_disable_gucid_threshold_get,
+ guc_sched_disable_gucid_threshold_set, "%lld\n");
+
void intel_guc_debugfs_register(struct intel_guc *guc, struct dentry *root)
{
static const struct intel_gt_debugfs_file files[] = {
{ "guc_info", &guc_info_fops, NULL },
{ "guc_registered_contexts", &guc_registered_contexts_fops, NULL },
{ "guc_slpc_info", &guc_slpc_info_fops, &intel_eval_slpc_support},
+ { "guc_sched_disable_delay_ms", &guc_sched_disable_delay_ms_fops, NULL },
+ { "guc_sched_disable_gucid_threshold", &guc_sched_disable_gucid_threshold_fops,
+ NULL },
};
if (!intel_guc_is_supported(guc))
* corresponding G2H returns indicating the scheduling disable operation has
* completed it is safe to unpin the context. While a disable is in flight it
* isn't safe to resubmit the context so a fence is used to stall all future
- * requests of that context until the G2H is returned.
+ * requests of that context until the G2H is returned. Because this interaction
+ * with the GuC takes a non-zero amount of time we delay the disabling of
+ * scheduling after the pin count goes to zero by a configurable period of time
+ * (see SCHED_DISABLE_DELAY_MS). The thought is this gives the user a window of
+ * time to resubmit something on the context before doing this costly operation.
+ * This delay is only done if the context isn't closed and the guc_id usage is
+ * less than a threshold (see NUM_SCHED_DISABLE_GUC_IDS_THRESHOLD).
*
* Context deregistration:
* Before a context can be destroyed or if we steal its guc_id we must
if (unlikely(ret < 0))
return ret;
+ if (!intel_context_is_parent(ce))
+ ++guc->submission_state.guc_ids_in_use;
+
ce->guc_id.id = ret;
return 0;
}
GEM_BUG_ON(intel_context_is_child(ce));
if (!context_guc_id_invalid(ce)) {
- if (intel_context_is_parent(ce))
+ if (intel_context_is_parent(ce)) {
bitmap_release_region(guc->submission_state.guc_ids_bitmap,
ce->guc_id.id,
order_base_2(ce->parallel.number_children
+ 1));
- else
+ } else {
+ --guc->submission_state.guc_ids_in_use;
ida_simple_remove(&guc->submission_state.guc_ids,
ce->guc_id.id);
+ }
clr_ctx_id_mapping(guc, ce->guc_id.id);
set_context_guc_id_invalid(ce);
}
}
}
-static void guc_context_sched_disable(struct intel_context *ce)
+static void guc_context_sched_disable(struct intel_context *ce);
+
+static void do_sched_disable(struct intel_guc *guc, struct intel_context *ce,
+ unsigned long flags)
+ __releases(ce->guc_state.lock)
{
- struct intel_guc *guc = ce_to_guc(ce);
- unsigned long flags;
struct intel_runtime_pm *runtime_pm = &ce->engine->gt->i915->runtime_pm;
intel_wakeref_t wakeref;
- u16 guc_id;
+ lockdep_assert_held(&ce->guc_state.lock);
+
+ spin_unlock_irqrestore(&ce->guc_state.lock, flags);
+
+ with_intel_runtime_pm(runtime_pm, wakeref)
+ guc_context_sched_disable(ce);
+}
+
+static bool bypass_sched_disable(struct intel_guc *guc,
+ struct intel_context *ce)
+{
+ lockdep_assert_held(&ce->guc_state.lock);
GEM_BUG_ON(intel_context_is_child(ce));
+ if (submission_disabled(guc) || context_guc_id_invalid(ce) ||
+ !ctx_id_mapped(guc, ce->guc_id.id)) {
+ clr_context_enabled(ce);
+ return true;
+ }
+
+ return !context_enabled(ce);
+}
+
+static void __delay_sched_disable(struct work_struct *wrk)
+{
+ struct intel_context *ce =
+ container_of(wrk, typeof(*ce), guc_state.sched_disable_delay.work);
+ struct intel_guc *guc = ce_to_guc(ce);
+ unsigned long flags;
+
spin_lock_irqsave(&ce->guc_state.lock, flags);
- /*
- * We have to check if the context has been disabled by another thread,
- * check if submssion has been disabled to seal a race with reset and
- * finally check if any more requests have been committed to the
- * context ensursing that a request doesn't slip through the
- * 'context_pending_disable' fence.
- */
- if (unlikely(!context_enabled(ce) || submission_disabled(guc) ||
- context_has_committed_requests(ce))) {
- clr_context_enabled(ce);
+ if (bypass_sched_disable(guc, ce)) {
spin_unlock_irqrestore(&ce->guc_state.lock, flags);
- goto unpin;
+ intel_context_sched_disable_unpin(ce);
+ } else {
+ do_sched_disable(guc, ce, flags);
}
- guc_id = prep_context_pending_disable(ce);
+}
- spin_unlock_irqrestore(&ce->guc_state.lock, flags);
+static bool guc_id_pressure(struct intel_guc *guc, struct intel_context *ce)
+{
+ /*
+ * parent contexts are perma-pinned, if we are unpinning do schedule
+ * disable immediately.
+ */
+ if (intel_context_is_parent(ce))
+ return true;
- with_intel_runtime_pm(runtime_pm, wakeref)
- __guc_context_sched_disable(guc, ce, guc_id);
+ /*
+ * If we are beyond the threshold for avail guc_ids, do schedule disable immediately.
+ */
+ return guc->submission_state.guc_ids_in_use >
+ guc->submission_state.sched_disable_gucid_threshold;
+}
+
+static void guc_context_sched_disable(struct intel_context *ce)
+{
+ struct intel_guc *guc = ce_to_guc(ce);
+ u64 delay = guc->submission_state.sched_disable_delay_ms;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ce->guc_state.lock, flags);
+
+ if (bypass_sched_disable(guc, ce)) {
+ spin_unlock_irqrestore(&ce->guc_state.lock, flags);
+ intel_context_sched_disable_unpin(ce);
+ } else if (!intel_context_is_closed(ce) && !guc_id_pressure(guc, ce) &&
+ delay) {
+ spin_unlock_irqrestore(&ce->guc_state.lock, flags);
+ mod_delayed_work(system_unbound_wq,
+ &ce->guc_state.sched_disable_delay,
+ msecs_to_jiffies(delay));
+ } else {
+ do_sched_disable(guc, ce, flags);
+ }
+}
- return;
-unpin:
- intel_context_sched_disable_unpin(ce);
+static void guc_context_close(struct intel_context *ce)
+{
+ if (test_bit(CONTEXT_GUC_INIT, &ce->flags) &&
+ cancel_delayed_work(&ce->guc_state.sched_disable_delay))
+ __delay_sched_disable(&ce->guc_state.sched_disable_delay.work);
}
static inline void guc_lrc_desc_unpin(struct intel_context *ce)
static const struct intel_context_ops guc_context_ops = {
.alloc = guc_context_alloc,
+ .close = guc_context_close,
+
.pre_pin = guc_context_pre_pin,
.pin = guc_context_pin,
.unpin = guc_context_unpin,
rcu_read_unlock();
ce->guc_state.prio = map_i915_prio_to_guc_prio(prio);
+
+ INIT_DELAYED_WORK(&ce->guc_state.sched_disable_delay,
+ __delay_sched_disable);
+
set_bit(CONTEXT_GUC_INIT, &ce->flags);
}
if (unlikely(!test_bit(CONTEXT_GUC_INIT, &ce->flags)))
guc_context_init(ce);
+ if (cancel_delayed_work(&ce->guc_state.sched_disable_delay))
+ intel_context_sched_disable_unpin(ce);
+
/*
* Call pin_guc_id here rather than in the pinning step as with
* dma_resv, contexts can be repeatedly pinned / unpinned trashing the
static const struct intel_context_ops virtual_guc_context_ops = {
.alloc = guc_virtual_context_alloc,
+ .close = guc_context_close,
+
.pre_pin = guc_virtual_context_pre_pin,
.pin = guc_virtual_context_pin,
.unpin = guc_virtual_context_unpin,
static const struct intel_context_ops virtual_parent_context_ops = {
.alloc = guc_virtual_context_alloc,
+ .close = guc_context_close,
+
.pre_pin = guc_context_pre_pin,
.pin = guc_parent_context_pin,
.unpin = guc_parent_context_unpin,
return i915->params.enable_guc & ENABLE_GUC_SUBMISSION;
}
+int intel_guc_sched_disable_gucid_threshold_max(struct intel_guc *guc)
+{
+ return guc->submission_state.num_guc_ids - NUMBER_MULTI_LRC_GUC_ID(guc);
+}
+
+/*
+ * This default value of 33 milisecs (+1 milisec round up) ensures 30fps or higher
+ * workloads are able to enjoy the latency reduction when delaying the schedule-disable
+ * operation. This matches the 30fps game-render + encode (real world) workload this
+ * knob was tested against.
+ */
+#define SCHED_DISABLE_DELAY_MS 34
+
+/*
+ * A threshold of 75% is a reasonable starting point considering that real world apps
+ * generally don't get anywhere near this.
+ */
+#define NUM_SCHED_DISABLE_GUCIDS_DEFAULT_THRESHOLD(__guc) \
+ (((intel_guc_sched_disable_gucid_threshold_max(guc)) * 3) / 4)
+
void intel_guc_submission_init_early(struct intel_guc *guc)
{
xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);
spin_lock_init(&guc->timestamp.lock);
INIT_DELAYED_WORK(&guc->timestamp.work, guc_timestamp_ping);
+ guc->submission_state.sched_disable_delay_ms = SCHED_DISABLE_DELAY_MS;
guc->submission_state.num_guc_ids = GUC_MAX_CONTEXT_ID;
+ guc->submission_state.sched_disable_gucid_threshold =
+ NUM_SCHED_DISABLE_GUCIDS_DEFAULT_THRESHOLD(guc);
guc->submission_supported = __guc_submission_supported(guc);
guc->submission_selected = __guc_submission_selected(guc);
}
projects / platform / kernel / linux-rpi.git / commitdiff