[PATCH 04/13] drm/i915/guc: The Additional Data Struct (ADS) should get enabled together with GuC submission

[Oscar Mateo]

It's mandatory and it gets created if and only if GuC submission is enabled, so that should be
the condition for informing the GuC about it.

Also s/guc_addon_create/guc_ads_create and s/guc_addon_destroy/guc_ads_destroy and, while
at it, add an explanation of what things go inside the ADS object.

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c | 17 ++++++++++++-----
 drivers/gpu/drm/i915/intel_guc_loader.c    | 10 ++++------
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index b24602b..ff8235a1 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -62,6 +62,13 @@
  * ELSP context descriptor dword into Work Item.
  * See guc_wq_item_append()
  *
+ * ADS:
+ * The Additional Data Struct (ADS) has pointers for different buffers used by
+ * the GuC. One single gem object contains the ADS struct itself (guc_ads), the
+ * scheduling policies (guc_policies), a structure describing a collection of
+ * register sets (guc_mmio_reg_state) and some extra pages for the GuC to save
+ * its internal state for sleep.
+ *
  */
 
 static inline bool is_high_priority(struct i915_guc_client* client)
@@ -937,7 +944,7 @@ static void guc_policies_init(struct guc_policies *policies)
 	policies->is_valid = 1;
 }
 
-static int guc_addon_create(struct intel_guc *guc)
+static int guc_ads_create(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	struct i915_vma *vma;
@@ -1000,7 +1007,7 @@ static int guc_addon_create(struct intel_guc *guc)
 	return 0;
 }
 
-static void guc_addon_destroy(struct intel_guc *guc)
+static void guc_ads_destroy(struct intel_guc *guc)
 {
 	i915_vma_unpin_and_release(&guc->ads_vma);
 }
@@ -1050,7 +1057,7 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
 	if (ret < 0)
 		goto err_vaddr;
 
-	ret = guc_addon_create(guc);
+	ret = guc_ads_create(guc);
 	if (ret < 0)
 		goto err_log;
 
@@ -1069,7 +1076,7 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
 	return 0;
 
 err_ads:
-	guc_addon_destroy(guc);
+	guc_ads_destroy(guc);
 err_log:
 	intel_guc_log_destroy(guc);
 err_vaddr:
@@ -1089,7 +1096,7 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
 	guc_client_free(guc->execbuf_client);
 	guc->execbuf_client = NULL;
 	ida_destroy(&guc->ctx_ids);
-	guc_addon_destroy(guc);
+	guc_ads_destroy(guc);
 	intel_guc_log_destroy(guc);
 	i915_gem_object_unpin_map(guc->ctx_pool->obj);
 	i915_vma_unpin_and_release(&guc->ctx_pool);
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index b8ba28d..62ebf56 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -148,17 +148,15 @@ static void guc_params_init(struct drm_i915_private *dev_priv)
 	} else
 		params[GUC_CTL_DEBUG] = GUC_LOG_DISABLED;
 
-	if (guc->ads_vma) {
-		u32 ads = guc_ggtt_offset(guc->ads_vma) >> PAGE_SHIFT;
-		params[GUC_CTL_DEBUG] |= ads << GUC_ADS_ADDR_SHIFT;
-		params[GUC_CTL_DEBUG] |= GUC_ADS_ENABLED;
-	}
-
 	/* If GuC submission is enabled, set up additional parameters here */
 	if (i915.enable_guc_submission) {
+		u32 ads = guc_ggtt_offset(guc->ads_vma) >> PAGE_SHIFT;
 		u32 pgs = guc_ggtt_offset(dev_priv->guc.ctx_pool);
 		u32 ctx_in_16 = GUC_MAX_GPU_CONTEXTS / 16;
 
+		params[GUC_CTL_DEBUG] |= ads << GUC_ADS_ADDR_SHIFT;
+		params[GUC_CTL_DEBUG] |= GUC_ADS_ENABLED;
+
 		pgs >>= PAGE_SHIFT;
 		params[GUC_CTL_CTXINFO] = (pgs << GUC_CTL_BASE_ADDR_SHIFT) |
 			(ctx_in_16 << GUC_CTL_CTXNUM_IN16_SHIFT);
-- 
1.9.1