drm/xe: Remove sysfs only once on action add failure

The drmm_add_action_or_reset function automatically invokes the action
(sysfs removal) in the event of a failure; therefore, there's no
necessity to call it within the return check.

Modify the return type of xe_gt_ccs_mode_sysfs_init to int, allowing the
caller to pass errors up the call chain. Should sysfs creation or
drmm_add_action_or_reset fail, error propagation will prompt a driver
load abort.

-v2
Edit commit message (Nikula/Lucas)
use err_force_wake label instead of new. (Lucas)
Avoid unnecessary warn/error messages. (Lucas)

Fixes: f3bc5bb4 ("drm/xe: Allow userspace to configure CCS mode")
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240412181211.1155732-3-himal.prasad.ghimiray@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/xe_gt.c

@@ -385,7 +385,9 @@ static int gt_fw_domain_init(struct xe_gt *gt)
 			 err);
 
 	/* Initialize CCS mode sysfs after early initialization of HW engines */
-	xe_gt_ccs_mode_sysfs_init(gt);
+	err = xe_gt_ccs_mode_sysfs_init(gt);
+	if (err)
+		goto err_force_wake;
 
 	/*
 	 * Stash hardware-reported version.  Since this register does not exist

drivers/gpu/drm/xe/xe_gt_ccs_mode.c

@@ -167,25 +167,20 @@ static void xe_gt_ccs_mode_sysfs_fini(struct drm_device *drm, void *arg)
  * and it is expected that there are no open drm clients while doing so.
  * The number of available compute slices is exposed to user through a per-gt
  * 'num_cslices' sysfs interface.
+ *
+ * Returns: Returns error value for failure and 0 for success.
  */
-void xe_gt_ccs_mode_sysfs_init(struct xe_gt *gt)
+int xe_gt_ccs_mode_sysfs_init(struct xe_gt *gt)
 {
 	struct xe_device *xe = gt_to_xe(gt);
 	int err;
 
 	if (!xe_gt_ccs_mode_enabled(gt))
-		return;
+		return 0;
 
 	err = sysfs_create_files(gt->sysfs, gt_ccs_mode_attrs);
-	if (err) {
-		drm_warn(&xe->drm, "Sysfs creation for ccs_mode failed err: %d\n", err);
-		return;
-	}
+	if (err)
+		return err;
 
-	err = drmm_add_action_or_reset(&xe->drm, xe_gt_ccs_mode_sysfs_fini, gt);
-	if (err) {
-		sysfs_remove_files(gt->sysfs, gt_ccs_mode_attrs);
-		drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",
-			 __func__, err);
-	}
+	return drmm_add_action_or_reset(&xe->drm, xe_gt_ccs_mode_sysfs_fini, gt);
 }

drivers/gpu/drm/xe/xe_gt_ccs_mode.h

@@ -12,7 +12,7 @@
 #include "xe_platform_types.h"
 
 void xe_gt_apply_ccs_mode(struct xe_gt *gt);
-void xe_gt_ccs_mode_sysfs_init(struct xe_gt *gt);
+int xe_gt_ccs_mode_sysfs_init(struct xe_gt *gt);
 
 static inline bool xe_gt_ccs_mode_enabled(const struct xe_gt *gt)
 {