drm/xe/uc: Split xe_uc_fw_init

The function does a driver specific "request firmware" step that
includes validating the input, followed by wrapping the firmware binary
into a buffer object. Split it into smaller parts.
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_uc_fw.c

@@ -635,15 +635,12 @@ do { \
 			  ver_->major, ver_->minor, ver_->patch); \
 } while (0)
 
-int xe_uc_fw_init(struct xe_uc_fw *uc_fw)
+static int uc_fw_request(struct xe_uc_fw *uc_fw, const struct firmware **firmware_p)
 {
 	struct xe_device *xe = uc_fw_to_xe(uc_fw);
-	struct xe_gt *gt = uc_fw_to_gt(uc_fw);
-	struct xe_tile *tile = gt_to_tile(gt);
 	struct device *dev = xe->drm.dev;
 	struct drm_printer p = drm_info_printer(dev);
 	const struct firmware *fw = NULL;
-	struct xe_bo *obj;
 	int err;
 
 	/*
@@ -691,9 +688,39 @@ int xe_uc_fw_init(struct xe_uc_fw *uc_fw)
 			goto fail;
 	}
 
-	obj = xe_managed_bo_create_from_data(xe, tile, fw->data, fw->size,
-					     XE_BO_CREATE_VRAM_IF_DGFX(tile) |
-					     XE_BO_CREATE_GGTT_BIT);
+	*firmware_p = fw;
+
+	return 0;
+
+fail:
+	xe_uc_fw_change_status(uc_fw, err == -ENOENT ?
+			       XE_UC_FIRMWARE_MISSING :
+			       XE_UC_FIRMWARE_ERROR);
+
+	drm_notice(&xe->drm, "%s firmware %s: fetch failed with error %d\n",
+		   xe_uc_fw_type_repr(uc_fw->type), uc_fw->path, err);
+	drm_info(&xe->drm, "%s firmware(s) can be downloaded from %s\n",
+		 xe_uc_fw_type_repr(uc_fw->type), XE_UC_FIRMWARE_URL);
+
+	release_firmware(fw);		/* OK even if fw is NULL */
+
+	return err;
+}
+
+static void uc_fw_release(const struct firmware *fw)
+{
+	release_firmware(fw);
+}
+
+static int uc_fw_copy(struct xe_uc_fw *uc_fw, const void *data, size_t size, u32 flags)
+{
+	struct xe_device *xe = uc_fw_to_xe(uc_fw);
+	struct xe_gt *gt = uc_fw_to_gt(uc_fw);
+	struct xe_tile *tile = gt_to_tile(gt);
+	struct xe_bo *obj;
+	int err;
+
+	obj = xe_managed_bo_create_from_data(xe, tile, data, size, flags);
 	if (IS_ERR(obj)) {
 		drm_notice(&xe->drm, "%s firmware %s: failed to create / populate bo",
 			   xe_uc_fw_type_repr(uc_fw->type), uc_fw->path);
@@ -702,28 +729,43 @@ int xe_uc_fw_init(struct xe_uc_fw *uc_fw)
 	}
 
 	uc_fw->bo = obj;
-	uc_fw->size = fw->size;
-	xe_uc_fw_change_status(uc_fw, XE_UC_FIRMWARE_AVAILABLE);
+	uc_fw->size = size;
 
-	release_firmware(fw);
+	xe_uc_fw_change_status(uc_fw, XE_UC_FIRMWARE_AVAILABLE);
 
 	err = drmm_add_action_or_reset(&xe->drm, uc_fw_fini, uc_fw);
 	if (err)
-		return err;
+		goto fail;
 
 	return 0;
 
 fail:
-	xe_uc_fw_change_status(uc_fw, err == -ENOENT ?
-			       XE_UC_FIRMWARE_MISSING :
-			       XE_UC_FIRMWARE_ERROR);
-
-	drm_notice(&xe->drm, "%s firmware %s: fetch failed with error %d\n",
+	xe_uc_fw_change_status(uc_fw, XE_UC_FIRMWARE_ERROR);
+	drm_notice(&xe->drm, "%s firmware %s: copy failed with error %d\n",
 		   xe_uc_fw_type_repr(uc_fw->type), uc_fw->path, err);
-	drm_info(&xe->drm, "%s firmware(s) can be downloaded from %s\n",
-		 xe_uc_fw_type_repr(uc_fw->type), XE_UC_FIRMWARE_URL);
 
-	release_firmware(fw);		/* OK even if fw is NULL */
+	return err;
+}
+
+int xe_uc_fw_init(struct xe_uc_fw *uc_fw)
+{
+	const struct firmware *fw = NULL;
+	struct xe_gt *gt = uc_fw_to_gt(uc_fw);
+	struct xe_tile *tile = gt_to_tile(gt);
+	int err;
+
+	err = uc_fw_request(uc_fw, &fw);
+	if (err)
+		return err;
+
+	/* no error and no firmware means nothing to copy */
+	if (!fw)
+		return 0;
+
+	err = uc_fw_copy(uc_fw, fw->data, fw->size,
+			 XE_BO_CREATE_VRAM_IF_DGFX(tile) | XE_BO_CREATE_GGTT_BIT);
+
+	uc_fw_release(fw);
 
 	return err;
 }