drm/i915/guc: add a helper to allocate and map guc vma

We already have a couple of use-cases in the code and another one will
come in one of the later patches in the series.

v2: use the new function for the CT object as well
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> #v1
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191205220243.27403-2-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc.c

@@ -704,3 +704,37 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
 	i915_gem_object_put(obj);
 	return vma;
 }
+
+/**
+ * intel_guc_allocate_and_map_vma() - Allocate and map VMA for GuC usage
+ * @guc:	the guc
+ * @size:	size of area to allocate (both virtual space and memory)
+ * @out_vma:	return variable for the allocated vma pointer
+ * @out_vaddr:	return variable for the obj mapping
+ *
+ * This wrapper calls intel_guc_allocate_vma() and then maps the allocated
+ * object with I915_MAP_WB.
+ *
+ * Return:	0 if successful, a negative errno code otherwise.
+ */
+int intel_guc_allocate_and_map_vma(struct intel_guc *guc, u32 size,
+				   struct i915_vma **out_vma, void **out_vaddr)
+{
+	struct i915_vma *vma;
+	void *vaddr;
+
+	vma = intel_guc_allocate_vma(guc, size);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
+	if (IS_ERR(vaddr)) {
+		i915_vma_unpin_and_release(&vma, 0);
+		return PTR_ERR(vaddr);
+	}
+
+	*out_vma = vma;
+	*out_vaddr = vaddr;
+
+	return 0;
+}

drivers/gpu/drm/i915/gt/uc/intel_guc.h

@@ -149,6 +149,8 @@ int intel_guc_auth_huc(struct intel_guc *guc, u32 rsa_offset);
 int intel_guc_suspend(struct intel_guc *guc);
 int intel_guc_resume(struct intel_guc *guc);
 struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
+int intel_guc_allocate_and_map_vma(struct intel_guc *guc, u32 size,
+				   struct i915_vma **out_vma, void **out_vaddr);
 
 static inline bool intel_guc_is_supported(struct intel_guc *guc)
 {

drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c

@@ -136,32 +136,19 @@ static void __guc_ads_init(struct intel_guc *guc)
 int intel_guc_ads_create(struct intel_guc *guc)
 {
 	const u32 size = PAGE_ALIGN(sizeof(struct __guc_ads_blob));
-	struct i915_vma *vma;
-	void *blob;
 	int ret;
 
 	GEM_BUG_ON(guc->ads_vma);
 
-	vma = intel_guc_allocate_vma(guc, size);
-	if (IS_ERR(vma))
-		return PTR_ERR(vma);
+	ret = intel_guc_allocate_and_map_vma(guc, size, &guc->ads_vma,
+					     (void **)&guc->ads_blob);
 
-	blob = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
-	if (IS_ERR(blob)) {
-		ret = PTR_ERR(blob);
-		goto err_vma;
-	}
-
-	guc->ads_vma = vma;
-	guc->ads_blob = blob;
+	if (ret)
+		return ret;
 
 	__guc_ads_init(guc);
 
 	return 0;
-
-err_vma:
-	i915_vma_unpin_and_release(&guc->ads_vma, 0);
-	return ret;
 }
 
 void intel_guc_ads_destroy(struct intel_guc *guc)

drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c

@@ -125,7 +125,6 @@ static int guc_action_deregister_ct_buffer(struct intel_guc *guc,
 static int ctch_init(struct intel_guc *guc,
 		     struct intel_guc_ct_channel *ctch)
 {
-	struct i915_vma *vma;
 	void *blob;
 	int err;
 	int i;
@@ -154,20 +153,13 @@ static int ctch_init(struct intel_guc *guc,
 	 * other code will need updating as well.
 	 */
 
-	/* allocate vma */
-	vma = intel_guc_allocate_vma(guc, PAGE_SIZE);
-	if (IS_ERR(vma)) {
-		err = PTR_ERR(vma);
-		goto err_out;
+	err = intel_guc_allocate_and_map_vma(guc, PAGE_SIZE, &ctch->vma, &blob);
+	if (err) {
+		CT_DEBUG_DRIVER("CT: channel %d initialization failed; err=%d\n",
+				ctch->owner, err);
+		return err;
 	}
-	ctch->vma = vma;
 
-	/* map first page */
-	blob = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
-	if (IS_ERR(blob)) {
-		err = PTR_ERR(blob);
-		goto err_vma;
-	}
 	CT_DEBUG_DRIVER("CT: vma base=%#x\n",
 			intel_guc_ggtt_offset(guc, ctch->vma));
 
@@ -179,13 +171,6 @@ static int ctch_init(struct intel_guc *guc,
 	}
 
 	return 0;
-
-err_vma:
-	i915_vma_unpin_and_release(&ctch->vma, 0);
-err_out:
-	CT_DEBUG_DRIVER("CT: channel %d initialization failed; err=%d\n",
-			ctch->owner, err);
-	return err;
 }
 
 static void ctch_fini(struct intel_guc *guc,

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -308,23 +308,15 @@ static void guc_proc_desc_fini(struct intel_guc_client *client)
 
 static int guc_stage_desc_pool_create(struct intel_guc *guc)
 {
-	struct i915_vma *vma;
-	void *vaddr;
-
-	vma = intel_guc_allocate_vma(guc,
-				     PAGE_ALIGN(sizeof(struct guc_stage_desc) *
-				     GUC_MAX_STAGE_DESCRIPTORS));
-	if (IS_ERR(vma))
-		return PTR_ERR(vma);
+	u32 size = PAGE_ALIGN(sizeof(struct guc_stage_desc) *
+			      GUC_MAX_STAGE_DESCRIPTORS);
+	int ret;
 
-	vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
-	if (IS_ERR(vaddr)) {
-		i915_vma_unpin_and_release(&vma, 0);
-		return PTR_ERR(vaddr);
-	}
+	ret = intel_guc_allocate_and_map_vma(guc, size, &guc->stage_desc_pool,
+					     &guc->stage_desc_pool_vaddr);
+	if (ret)
+		return ret;
 
-	guc->stage_desc_pool = vma;
-	guc->stage_desc_pool_vaddr = vaddr;
 	ida_init(&guc->stage_ids);
 
 	return 0;