[Intel-gfx] [RFC PATCH 76/97] drm/i915/guc: Hook GuC scheduling policies up

[Matthew Brost]

From: John Harrison <John.C.Harrison at Intel.com>

Use the official driver default scheduling policies for configuring
the GuC scheduler rather than a bunch of hardcoded values.

Signed-off-by: John Harrison <john.c.harrison at intel.com>
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
Cc: Jose Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_types.h  |  1 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  2 +
 drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c    | 44 ++++++++++++++++++-
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 11 +++--
 4 files changed, 53 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index bba53e3b39b9..16cc8453b01c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -461,6 +461,7 @@ struct intel_engine_cs {
 #define I915_ENGINE_IS_VIRTUAL       BIT(5)
 #define I915_ENGINE_HAS_RELATIVE_MMIO BIT(6)
 #define I915_ENGINE_REQUIRES_CMD_PARSER BIT(7)
+#define I915_ENGINE_WANT_FORCED_PREEMPTION BIT(8)
 	unsigned int flags;
 
 	/*
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 10b48b9f7603..266358d04bfc 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -271,6 +271,8 @@ int intel_guc_engine_failure_process_msg(struct intel_guc *guc,
 
 void intel_guc_find_hung_context(struct intel_engine_cs *engine);
 
+int intel_guc_global_policies_update(struct intel_guc *guc);
+
 void intel_guc_submission_reset_prepare(struct intel_guc *guc);
 void intel_guc_submission_reset(struct intel_guc *guc, bool stalled);
 void intel_guc_submission_reset_finish(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
index 179ab658d2b5..b37473bc8fff 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -80,14 +80,54 @@ static u32 guc_ads_blob_size(struct intel_guc *guc)
 	       guc_ads_private_data_size(guc);
 }
 
-static void guc_policies_init(struct guc_policies *policies)
+static void guc_policies_init(struct intel_guc *guc, struct guc_policies *policies)
 {
+	struct intel_gt *gt = guc_to_gt(guc);
+	struct drm_i915_private *i915 = gt->i915;
+
 	policies->dpc_promote_time = GLOBAL_POLICY_DEFAULT_DPC_PROMOTE_TIME_US;
 	policies->max_num_work_items = GLOBAL_POLICY_MAX_NUM_WI;
+
 	policies->global_flags = 0;
+	if (i915->params.reset < 2)
+		policies->global_flags |= GLOBAL_POLICY_DISABLE_ENGINE_RESET;
+
 	policies->is_valid = 1;
 }
 
+static int guc_action_policies_update(struct intel_guc *guc, u32 policy_offset)
+{
+	u32 action[] = {
+		INTEL_GUC_ACTION_GLOBAL_SCHED_POLICY_CHANGE,
+		policy_offset
+	};
+
+	return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+int intel_guc_global_policies_update(struct intel_guc *guc)
+{
+	struct __guc_ads_blob *blob = guc->ads_blob;
+	struct intel_gt *gt = guc_to_gt(guc);
+	intel_wakeref_t wakeref;
+	int ret;
+
+	if (!blob)
+		return -ENOTSUPP;
+
+	GEM_BUG_ON(!blob->ads.scheduler_policies);
+
+	guc_policies_init(guc, &blob->policies);
+
+	if (!intel_guc_is_ready(guc))
+		return 0;
+
+	with_intel_runtime_pm(&gt->i915->runtime_pm, wakeref)
+		ret = guc_action_policies_update(guc, blob->ads.scheduler_policies);
+
+	return ret;
+}
+
 static void guc_mapping_table_init(struct intel_gt *gt,
 				   struct guc_gt_system_info *system_info)
 {
@@ -284,7 +324,7 @@ static void __guc_ads_init(struct intel_guc *guc)
 	u8 engine_class, guc_class;
 
 	/* GuC scheduling policies */
-	guc_policies_init(&blob->policies);
+	guc_policies_init(guc, &blob->policies);
 
 	/*
 	 * GuC expects a per-engine-class context image and size
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index ad3d2326a81d..a9fb31370c61 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -872,6 +872,7 @@ void intel_guc_submission_reset_finish(struct intel_guc *guc)
 	GEM_WARN_ON(atomic_read(&guc->outstanding_submission_g2h));
 	atomic_set(&guc->outstanding_submission_g2h, 0);
 
+	intel_guc_global_policies_update(guc);
 	enable_submission(guc);
 	intel_gt_unpark_heartbeats(guc_to_gt(guc));
 }
@@ -1160,8 +1161,12 @@ static void guc_context_policy_init(struct intel_engine_cs *engine,
 {
 	desc->policy_flags = 0;
 
-	desc->execution_quantum = CONTEXT_POLICY_DEFAULT_EXECUTION_QUANTUM_US;
-	desc->preemption_timeout = CONTEXT_POLICY_DEFAULT_PREEMPTION_TIME_US;
+	if (engine->flags & I915_ENGINE_WANT_FORCED_PREEMPTION)
+		desc->policy_flags |= CONTEXT_POLICY_FLAG_PREEMPT_TO_IDLE;
+
+	/* NB: For both of these, zero means disabled. */
+	desc->execution_quantum = engine->props.timeslice_duration_ms * 1000;
+	desc->preemption_timeout = engine->props.preempt_timeout_ms * 1000;
 }
 
 static int guc_lrc_desc_pin(struct intel_context *ce, bool loop)
@@ -1942,13 +1947,13 @@ static void guc_default_vfuncs(struct intel_engine_cs *engine)
 	engine->set_default_submission = guc_set_default_submission;
 
 	engine->flags |= I915_ENGINE_HAS_PREEMPTION;
+	engine->flags |= I915_ENGINE_HAS_TIMESLICES;
 
 	/*
 	 * TODO: GuC supports timeslicing and semaphores as well, but they're
 	 * handled by the firmware so some minor tweaks are required before
 	 * enabling.
 	 *
-	 * engine->flags |= I915_ENGINE_HAS_TIMESLICES;
 	 * engine->flags |= I915_ENGINE_HAS_SEMAPHORES;
 	 */
 
-- 
2.28.0