drm/xe: introduce xe_gt_reset and xe_gt_wait_for_reset

Add synchronous version gt reset as there are few places where it
is expected.
Also add a wait helper to wait until gt reset is done.

Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Fixes: f3bc5bb ("drm/xe: Allow userspace to configure CCS mode")
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241211111727.1481476-2-maciej.patelczyk@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>

Author: mpatelcz

drivers/gpu/drm/xe/tests/xe_bo.c

@@ -264,10 +264,9 @@ static int evict_test_run_tile(struct xe_device *xe, struct xe_tile *tile, struc
 		 * however seems quite fragile not to also restart the GT. Try
 		 * to do that here by triggering a GT reset.
 		 */
-		for_each_gt(__gt, xe, id) {
-			xe_gt_reset_async(__gt);
-			flush_work(&__gt->reset.worker);
-		}
+		for_each_gt(__gt, xe, id)
+			xe_gt_reset(__gt);
+
 		if (err) {
 			KUNIT_FAIL(test, "restore kernel err=%pe\n",
 				   ERR_PTR(err));

drivers/gpu/drm/xe/tests/xe_mocs.c

@@ -162,8 +162,7 @@ static int mocs_reset_test_run_device(struct xe_device *xe)
 		if (flags & HAS_LNCF_MOCS)
 			read_l3cc_table(gt, &mocs.table);
 
-		xe_gt_reset_async(gt);
-		flush_work(&gt->reset.worker);
+		xe_gt_reset(gt);
 
 		kunit_info(test, "mocs_reset_test after reset\n");
 		if (flags & HAS_GLOBAL_MOCS)

drivers/gpu/drm/xe/xe_gt.h

@@ -56,6 +56,31 @@ void xe_gt_sanitize(struct xe_gt *gt);
 int xe_gt_sanitize_freq(struct xe_gt *gt);
 void xe_gt_remove(struct xe_gt *gt);
 
+/**
+ * xe_gt_wait_for_reset - wait for gt's async reset to finalize.
+ * @gt: GT structure
+ * Return:
+ * %true if it waited for the work to finish execution,
+ * %false if there was no scheduled reset or it was done.
+ */
+static inline bool xe_gt_wait_for_reset(struct xe_gt *gt)
+{
+	return flush_work(&gt->reset.worker);
+}
+
+/**
+ * xe_gt_reset - perform synchronous reset
+ * @gt: GT structure
+ * Return:
+ * %true if it waited for the reset to finish,
+ * %false if there was no scheduled reset.
+ */
+static inline bool xe_gt_reset(struct xe_gt *gt)
+{
+	xe_gt_reset_async(gt);
+	return xe_gt_wait_for_reset(gt);
+}
+
 /**
  * xe_gt_any_hw_engine_by_reset_domain - scan the list of engines and return the
  * first that matches the same reset domain as @class

drivers/gpu/drm/xe/xe_gt_debugfs.c

@@ -132,11 +132,9 @@ static int force_reset(struct xe_gt *gt, struct drm_printer *p)
 static int force_reset_sync(struct xe_gt *gt, struct drm_printer *p)
 {
 	xe_pm_runtime_get(gt_to_xe(gt));
-	xe_gt_reset_async(gt);
+	xe_gt_reset(gt);
 	xe_pm_runtime_put(gt_to_xe(gt));
 
-	flush_work(&gt->reset.worker);
-
 	return 0;
 }