drm/managed: Add DRM-managed alloc_ordered_workqueue

Add drmm_alloc_ordered_workqueue(), a helper that provides managed ordered
workqueue cleanup. The workqueue will be destroyed with the final
reference of the DRM device.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250116-google-vkms-managed-v9-3-3e4ae1bd05a0@bootlin.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index 79ce86a5bd67a7201f5d60550a12364f2628e0ec..cc4c463daae7ca44914d3468457a22574cdd0a54 100644 (file)
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -310,3 +310,11 @@ void __drmm_mutex_release(struct drm_device *dev, void *res)
        mutex_destroy(lock);
 }
 EXPORT_SYMBOL(__drmm_mutex_release);
+
+void __drmm_workqueue_release(struct drm_device *device, void *res)
+{
+       struct workqueue_struct *wq = res;
+
+       destroy_workqueue(wq);
+}
+EXPORT_SYMBOL(__drmm_workqueue_release);

diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index f547b09ca0239dd7c4fb734038bae4438321395c..53017cc609ac617283e3be70cb5759908b049c4d 100644 (file)
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -127,4 +127,16 @@ void __drmm_mutex_release(struct drm_device *dev, void *res);
        drmm_add_action_or_reset(dev, __drmm_mutex_release, lock);           \
 })                                                                          \
 
+void __drmm_workqueue_release(struct drm_device *device, void *wq);
+
+#define drmm_alloc_ordered_workqueue(dev, fmt, flags, args...)                                 \
+       ({                                                                                      \
+               struct workqueue_struct *wq = alloc_ordered_workqueue(fmt, flags, ##args);      \
+               wq ? ({                                                                         \
+                       int ret = drmm_add_action_or_reset(dev, __drmm_workqueue_release, wq);  \
+                       ret ? ERR_PTR(ret) : wq;                                                \
+               }) :                                                                            \
+                       wq;                                                                     \
+       })
+
 #endif