[PATCH v2 4/6] drm/i915/guc: add engine mask to GuC client & pass to GuC

[Dave Gordon <david.s.gordon@xxxxxxxxx>]

The Context Descriptor passed by the kernel to the GuC contains a field
specifying which engine(s) the context will use. Historically, this was
always set to "all of them", but now that we have one client per engine,
we can be more precise, and set only the single bit for the engine that
the client is associated with.

Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_guc_submission.c | 15 ++++++++++-----
 drivers/gpu/drm/i915/intel_guc.h           |  3 ++-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 9999797..6756db0 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -340,7 +340,7 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 	desc.priority = client->priority;
 	desc.db_id = client->doorbell_id;
 
-	for_each_engine(engine, dev_priv) {
+	for_each_engine_masked(engine, dev_priv, client->engines) {
 		struct intel_context *ce = &ctx->engine[engine->id];
 		struct guc_execlist_context *lrc = &desc.lrc[engine->guc_id];
 		struct drm_i915_gem_object *obj;
@@ -374,6 +374,8 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 		desc.engines_used |= (1 << engine->guc_id);
 	}
 
+	DRM_DEBUG_DRIVER("Host engines 0x%x => GuC engines used 0x%x\n",
+			client->engines, desc.engines_used);
 	WARN_ON(desc.engines_used == 0);
 
 	/*
@@ -768,6 +770,7 @@ static void guc_init_doorbell_hw(struct intel_guc *guc)
  */
 static struct i915_guc_client *
 guc_client_alloc(struct drm_i915_private *dev_priv,
+		 uint32_t engines,
 		 uint32_t priority,
 		 struct i915_gem_context *ctx)
 {
@@ -780,10 +783,11 @@ static void guc_init_doorbell_hw(struct intel_guc *guc)
 	if (!client)
 		return NULL;
 
-	client->doorbell_id = GUC_INVALID_DOORBELL_ID;
-	client->priority = priority;
 	client->owner = ctx;
 	client->guc = guc;
+	client->engines = engines;
+	client->priority = priority;
+	client->doorbell_id = GUC_INVALID_DOORBELL_ID;
 
 	client->ctx_index = (uint32_t)ida_simple_get(&guc->ctx_ids, 0,
 			GUC_MAX_GPU_CONTEXTS, GFP_KERNEL);
@@ -825,8 +829,8 @@ static void guc_init_doorbell_hw(struct intel_guc *guc)
 	if (guc_init_doorbell(guc, client, db_id))
 		goto err;
 
-	DRM_DEBUG_DRIVER("new priority %u client %p: ctx_index %u\n",
-		priority, client, client->ctx_index);
+	DRM_DEBUG_DRIVER("new priority %u client %p for engine(s) 0x%x: ctx_index %u\n",
+		priority, client, client->engines, client->ctx_index);
 	DRM_DEBUG_DRIVER("doorbell id %u, cacheline offset 0x%x\n",
 		client->doorbell_id, client->doorbell_offset);
 
@@ -1011,6 +1015,7 @@ int i915_guc_submission_enable(struct drm_i915_private *dev_priv)
 	for_each_engine(engine, dev_priv) {
 		/* client for execbuf submission */
 		client = guc_client_alloc(dev_priv,
+					  intel_engine_flag(engine),
 					  GUC_CTX_PRIORITY_KMD_NORMAL,
 					  dev_priv->kernel_context);
 		if (!client) {
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 7b4cc4d..53d41b5 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -67,6 +67,8 @@ struct i915_guc_client {
 	void *client_base;		/* first page (only) of above	*/
 	struct i915_gem_context *owner;
 	struct intel_guc *guc;
+
+	uint32_t engines;		/* bitmap of (host) engine ids	*/
 	uint32_t priority;
 	uint32_t ctx_index;
 
@@ -79,7 +81,6 @@ struct i915_guc_client {
 	uint32_t wq_offset;
 	uint32_t wq_size;
 	uint32_t wq_tail;
-	uint32_t unused;		/* Was 'wq_head'		*/
 
 	uint32_t no_wq_space;
 	uint32_t q_fail;		/* No longer used		*/
-- 
1.9.1

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