drm/xe: Make the gem shrinker drm managed

Make the xe drm shrinker drm managed like many other resources
created at device creation time.

Signed-off-by: Thomas Hellström <[e-mail]>
Reviewed-by: Matthew Auld <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/xe/xe_device.c

···
 	if (xe->unordered_wq)
 		destroy_workqueue(xe->unordered_wq);
 
-	if (!IS_ERR_OR_NULL(xe->mem.shrinker))
-		xe_shrinker_destroy(xe->mem.shrinker);
-
 	if (xe->destroy_wq)
 		destroy_workqueue(xe->destroy_wq);
 
···
 	if (err)
 		goto err;
 
-	xe->mem.shrinker = xe_shrinker_create(xe);
-	if (IS_ERR(xe->mem.shrinker))
-		return ERR_CAST(xe->mem.shrinker);
+	err = xe_shrinker_create(xe);
+	if (err)
+		goto err;
 
 	xe->info.devid = pdev->device;
 	xe->info.revid = pdev->revision;

drivers/gpu/drm/xe/xe_shrinker.c

···
 
 #include <linux/shrinker.h>
 
+#include <drm/drm_managed.h>
 #include <drm/ttm/ttm_backup.h>
 #include <drm/ttm/ttm_bo.h>
 #include <drm/ttm/ttm_tt.h>
···
 	xe_pm_runtime_put(shrinker->xe);
 }
 
+static void xe_shrinker_fini(struct drm_device *drm, void *arg)
+{
+	struct xe_shrinker *shrinker = arg;
+
+	xe_assert(shrinker->xe, !shrinker->shrinkable_pages);
+	xe_assert(shrinker->xe, !shrinker->purgeable_pages);
+	shrinker_free(shrinker->shrink);
+	flush_work(&shrinker->pm_worker);
+	kfree(shrinker);
+}
+
 /**
  * xe_shrinker_create() - Create an xe per-device shrinker
  * @xe: Pointer to the xe device.
  *
- * Returns: A pointer to the created shrinker on success,
- * Negative error code on failure.
+ * Return: %0 on success. Negative error code on failure.
  */
-struct xe_shrinker *xe_shrinker_create(struct xe_device *xe)
+int xe_shrinker_create(struct xe_device *xe)
 {
 	struct xe_shrinker *shrinker = kzalloc(sizeof(*shrinker), GFP_KERNEL);
 
 	if (!shrinker)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	shrinker->shrink = shrinker_alloc(0, "drm-xe_gem:%s", xe->drm.unique);
 	if (!shrinker->shrink) {
 		kfree(shrinker);
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	}
 
 	INIT_WORK(&shrinker->pm_worker, xe_shrinker_pm);
···
 	shrinker->shrink->scan_objects = xe_shrinker_scan;
 	shrinker->shrink->private_data = shrinker;
 	shrinker_register(shrinker->shrink);
+	xe->mem.shrinker = shrinker;
 
-	return shrinker;
-}
-
-/**
- * xe_shrinker_destroy() - Destroy an xe per-device shrinker
- * @shrinker: Pointer to the shrinker to destroy.
- */
-void xe_shrinker_destroy(struct xe_shrinker *shrinker)
-{
-	xe_assert(shrinker->xe, !shrinker->shrinkable_pages);
-	xe_assert(shrinker->xe, !shrinker->purgeable_pages);
-	shrinker_free(shrinker->shrink);
-	flush_work(&shrinker->pm_worker);
-	kfree(shrinker);
+	return drmm_add_action_or_reset(&xe->drm, xe_shrinker_fini, shrinker);
 }

drivers/gpu/drm/xe/xe_shrinker.h

···
 
 void xe_shrinker_mod_pages(struct xe_shrinker *shrinker, long shrinkable, long purgeable);
 
-struct xe_shrinker *xe_shrinker_create(struct xe_device *xe);
-
-void xe_shrinker_destroy(struct xe_shrinker *shrinker);
+int xe_shrinker_create(struct xe_device *xe);
 
 #endif