drm/i915/guc: Simplify guc client

We originally added support, in some cases partial, for different modes
of operations via guc clients:

- proxy vs direct submission;
- variable engine mask per-client.

We only ever used one flow (all submissions via a single proxy), so the
other code paths haven't been exercised and are most likely
non-functional. The guc firmware interface is also in the process of
being updated to better fit the i915 flow and our client abstraction
will need to change accordingly (or possibly go away entirely), so these
old unused paths can be considered dead and removed.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Acked-by: Matthew Brost &lt;Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190710005437.3496-3-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2021,7 +2021,6 @@ static int i915_guc_stage_pool(struct seq_file *m, void *data)
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
 	const struct intel_guc *guc = &dev_priv->guc;
 	struct guc_stage_desc *desc = guc->stage_desc_pool_vaddr;
-	struct intel_guc_client *client = guc->execbuf_client;
 	intel_engine_mask_t tmp;
 	int index;
 
@@ -2051,7 +2050,7 @@ static int i915_guc_stage_pool(struct seq_file *m, void *data)
 			   desc->wq_addr, desc->wq_size);
 		seq_putc(m, '\n');
 
-		for_each_engine_masked(engine, dev_priv, client->engines, tmp) {
+		for_each_engine(engine, dev_priv, tmp) {
 			u32 guc_engine_id = engine->guc_id;
 			struct guc_execlist_context *lrc =
 						&desc->lrc[guc_engine_id];

drivers/gpu/drm/i915/intel_guc_submission.c

@@ -363,10 +363,7 @@ static void guc_stage_desc_pool_destroy(struct intel_guc *guc)
 static void guc_stage_desc_init(struct intel_guc_client *client)
 {
 	struct intel_guc *guc = client->guc;
-	struct i915_gem_context *ctx = client->owner;
-	struct i915_gem_engines_iter it;
 	struct guc_stage_desc *desc;
-	struct intel_context *ce;
 	u32 gfx_addr;
 
 	desc = __get_stage_desc(client);
@@ -380,55 +377,6 @@ static void guc_stage_desc_init(struct intel_guc_client *client)
 	desc->priority = client->priority;
 	desc->db_id = client->doorbell_id;
 
-	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
-		struct guc_execlist_context *lrc;
-
-		if (!(ce->engine->mask & client->engines))
-			continue;
-
-		/* TODO: We have a design issue to be solved here. Only when we
-		 * receive the first batch, we know which engine is used by the
-		 * user. But here GuC expects the lrc and ring to be pinned. It
-		 * is not an issue for default context, which is the only one
-		 * for now who owns a GuC client. But for future owner of GuC
-		 * client, need to make sure lrc is pinned prior to enter here.
-		 */
-		if (!ce->state)
-			break;	/* XXX: continue? */
-
-		/*
-		 * XXX: When this is a GUC_STAGE_DESC_ATTR_KERNEL client (proxy
-		 * submission or, in other words, not using a direct submission
-		 * model) the KMD's LRCA is not used for any work submission.
-		 * Instead, the GuC uses the LRCA of the user mode context (see
-		 * guc_add_request below).
-		 */
-		lrc = &desc->lrc[ce->engine->guc_id];
-		lrc->context_desc = lower_32_bits(ce->lrc_desc);
-
-		/* The state page is after PPHWSP */
-		lrc->ring_lrca = intel_guc_ggtt_offset(guc, ce->state) +
-				 LRC_STATE_PN * PAGE_SIZE;
-
-		/* XXX: In direct submission, the GuC wants the HW context id
-		 * here. In proxy submission, it wants the stage id
-		 */
-		lrc->context_id = (client->stage_id << GUC_ELC_CTXID_OFFSET) |
-				(ce->engine->guc_id << GUC_ELC_ENGINE_OFFSET);
-
-		lrc->ring_begin = intel_guc_ggtt_offset(guc, ce->ring->vma);
-		lrc->ring_end = lrc->ring_begin + ce->ring->size - 1;
-		lrc->ring_next_free_location = lrc->ring_begin;
-		lrc->ring_current_tail_pointer_value = 0;
-
-		desc->engines_used |= BIT(ce->engine->guc_id);
-	}
-	i915_gem_context_unlock_engines(ctx);
-
-	DRM_DEBUG_DRIVER("Host engines 0x%x => GuC engines used 0x%x\n",
-			 client->engines, desc->engines_used);
-	WARN_ON(desc->engines_used == 0);
-
 	/*
 	 * The doorbell, process descriptor, and workqueue are all parts
 	 * of the client object, which the GuC will reference via the GGTT
@@ -836,8 +784,7 @@ static bool guc_verify_doorbells(struct intel_guc *guc)
 
 /**
  * guc_client_alloc() - Allocate an intel_guc_client
- * @dev_priv:	driver private data structure
- * @engines:	The set of engines to enable for this client
+ * @guc:	the intel_guc structure
  * @priority:	four levels priority _CRITICAL, _HIGH, _NORMAL and _LOW
  *		The kernel client to replace ExecList submission is created with
  *		NORMAL priority. Priority of a client for scheduler can be HIGH,
@@ -848,13 +795,9 @@ static bool guc_verify_doorbells(struct intel_guc *guc)
  * Return:	An intel_guc_client object if success, else NULL.
  */
 static struct intel_guc_client *
-guc_client_alloc(struct drm_i915_private *dev_priv,
-		 u32 engines,
-		 u32 priority,
-		 struct i915_gem_context *ctx)
+guc_client_alloc(struct intel_guc *guc, u32 priority)
 {
 	struct intel_guc_client *client;
-	struct intel_guc *guc = &dev_priv->guc;
 	struct i915_vma *vma;
 	void *vaddr;
 	int ret;
@@ -864,8 +807,6 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
 		return ERR_PTR(-ENOMEM);
 
 	client->guc = guc;
-	client->owner = ctx;
-	client->engines = engines;
 	client->priority = priority;
 	client->doorbell_id = GUC_DOORBELL_INVALID;
 	spin_lock_init(&client->wq_lock);
@@ -910,8 +851,8 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
 	else
 		client->proc_desc_offset = (GUC_DB_SIZE / 2);
 
-	DRM_DEBUG_DRIVER("new priority %u client %p for engine(s) 0x%x: stage_id %u\n",
-			 priority, client, client->engines, client->stage_id);
+	DRM_DEBUG_DRIVER("new priority %u client %p: stage_id %u\n",
+			 priority, client, client->stage_id);
 	DRM_DEBUG_DRIVER("doorbell id %u, cacheline offset 0x%lx\n",
 			 client->doorbell_id, client->doorbell_offset);
 
@@ -951,15 +892,11 @@ static inline bool ctx_save_restore_disabled(struct intel_context *ce)
 
 static int guc_clients_create(struct intel_guc *guc)
 {
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	struct intel_guc_client *client;
 
 	GEM_BUG_ON(guc->execbuf_client);
 
-	client = guc_client_alloc(dev_priv,
-				  INTEL_INFO(dev_priv)->engine_mask,
-				  GUC_CLIENT_PRIORITY_KMD_NORMAL,
-				  dev_priv->kernel_context);
+	client = guc_client_alloc(guc, GUC_CLIENT_PRIORITY_KMD_NORMAL);
 	if (IS_ERR(client)) {
 		DRM_ERROR("Failed to create GuC client for submission!\n");
 		return PTR_ERR(client);

drivers/gpu/drm/i915/intel_guc_submission.h

@@ -58,11 +58,9 @@ struct drm_i915_private;
 struct intel_guc_client {
 	struct i915_vma *vma;
 	void *vaddr;
-	struct i915_gem_context *owner;
 	struct intel_guc *guc;
 
 	/* bitmap of (host) engine ids */
-	u32 engines;
 	u32 priority;
 	u32 stage_id;
 	u32 proc_desc_offset;

drivers/gpu/drm/i915/selftests/intel_guc.c

@@ -105,12 +105,7 @@ static int ring_doorbell_nop(struct intel_guc_client *client)
  */
 static int validate_client(struct intel_guc_client *client, int client_priority)
 {
-	struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
-	struct i915_gem_context *ctx_owner = dev_priv->kernel_context;
-
-	if (client->owner != ctx_owner ||
-	    client->engines != INTEL_INFO(dev_priv)->engine_mask ||
-	    client->priority != client_priority ||
+	if (client->priority != client_priority ||
 	    client->doorbell_id == GUC_DOORBELL_INVALID)
 		return -EINVAL;
 	else
@@ -247,10 +242,7 @@ static int igt_guc_doorbells(void *arg)
 		goto unlock;
 
 	for (i = 0; i < ATTEMPTS; i++) {
-		clients[i] = guc_client_alloc(dev_priv,
-					      INTEL_INFO(dev_priv)->engine_mask,
-					      i % GUC_CLIENT_PRIORITY_NUM,
-					      dev_priv->kernel_context);
+		clients[i] = guc_client_alloc(guc, i % GUC_CLIENT_PRIORITY_NUM);
 
 		if (!clients[i]) {
 			pr_err("[%d] No guc client\n", i);