drm: Provide a driver hook for drm_dev_release()

Some state is coupled into the device lifetime outside of the
load/unload timeframe and requires teardown during final unreference
from drm_dev_release(). For example, dmabufs hold both a device and
module reference and may live longer than expected (i.e. the current
pattern of the driver tearing down its state and then releasing a
reference to the drm device) and yet touch driver private state when
destroyed.

v2: Export drm_dev_fini() and move the responsibility for finalizing the
drm_device and freeing it to the release callback. (If no callback is
provided, the core will call drm_dev_fini() and kfree(dev) as before.)
v3: Remember to add drm_dev_fini() to drm_drv.h
v4: Tidy language for kerneldoc
v5: Cross reference from drm_dev_init() to note that driver->release()
allows for arbitrary embedding.
v6: Refer to driver data rather than driver state, as state is now
becoming associated with the struct drm_atomic_state and friends.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[danvet: Use the proper reference for struct members, which is
&drm_driver.release.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170202093632.31017-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 6cbd67f..45ce224 100644 (file)
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -465,7 +465,10 @@ static void drm_fs_inode_free(struct inode *inode)
  * that do embed &struct drm_device it must be placed first in the overall
  * structure, and the overall structure must be allocated using kmalloc(): The
  * drm core's release function unconditionally calls kfree() on the @dev pointer
- * when the final reference is released.
+ * when the final reference is released. To override this behaviour, and so
+ * allow embedding of the drm_device inside the driver's device struct at an
+ * arbitrary offset, you must supply a &drm_driver.release callback and control
+ * the finalization explicitly.
  *
  * RETURNS:
  * 0 on success, or error code on failure.
@@ -553,6 +556,41 @@ err_free:
 EXPORT_SYMBOL(drm_dev_init);
 
 /**
+ * drm_dev_fini - Finalize a dead DRM device
+ * @dev: DRM device
+ *
+ * Finalize a dead DRM device. This is the converse to drm_dev_init() and
+ * frees up all data allocated by it. All driver private data should be
+ * finalized first. Note that this function does not free the @dev, that is
+ * left to the caller.
+ *
+ * The ref-count of @dev must be zero, and drm_dev_fini() should only be called
+ * from a &drm_driver.release callback.
+ */
+void drm_dev_fini(struct drm_device *dev)
+{
+       drm_vblank_cleanup(dev);
+
+       if (drm_core_check_feature(dev, DRIVER_GEM))
+               drm_gem_destroy(dev);
+
+       drm_legacy_ctxbitmap_cleanup(dev);
+       drm_ht_remove(&dev->map_hash);
+       drm_fs_inode_free(dev->anon_inode);
+
+       drm_minor_free(dev, DRM_MINOR_PRIMARY);
+       drm_minor_free(dev, DRM_MINOR_RENDER);
+       drm_minor_free(dev, DRM_MINOR_CONTROL);
+
+       mutex_destroy(&dev->master_mutex);
+       mutex_destroy(&dev->ctxlist_mutex);
+       mutex_destroy(&dev->filelist_mutex);
+       mutex_destroy(&dev->struct_mutex);
+       kfree(dev->unique);
+}
+EXPORT_SYMBOL(drm_dev_fini);
+
+/**
  * drm_dev_alloc - Allocate new DRM device
  * @driver: DRM driver to allocate device for
  * @parent: Parent device object
@@ -598,25 +636,12 @@ static void drm_dev_release(struct kref *ref)
 {
        struct drm_device *dev = container_of(ref, struct drm_device, ref);
 
-       drm_vblank_cleanup(dev);
-
-       if (drm_core_check_feature(dev, DRIVER_GEM))
-               drm_gem_destroy(dev);
-
-       drm_legacy_ctxbitmap_cleanup(dev);
-       drm_ht_remove(&dev->map_hash);
-       drm_fs_inode_free(dev->anon_inode);
-
-       drm_minor_free(dev, DRM_MINOR_PRIMARY);
-       drm_minor_free(dev, DRM_MINOR_RENDER);
-       drm_minor_free(dev, DRM_MINOR_CONTROL);
-
-       mutex_destroy(&dev->master_mutex);
-       mutex_destroy(&dev->ctxlist_mutex);
-       mutex_destroy(&dev->filelist_mutex);
-       mutex_destroy(&dev->struct_mutex);
-       kfree(dev->unique);
-       kfree(dev);
+       if (dev->driver->release) {
+               dev->driver->release(dev);
+       } else {
+               drm_dev_fini(dev);
+               kfree(dev);
+       }
 }
 
 /**

diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 732e856..5699f42 100644 (file)
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -102,6 +102,17 @@ struct drm_driver {
         *
         */
        void (*unload) (struct drm_device *);
+
+       /**
+        * @release:
+        *
+        * Optional callback for destroying device data after the final
+        * reference is released, i.e. the device is being destroyed. Drivers
+        * using this callback are responsible for calling drm_dev_fini()
+        * to finalize the device and then freeing the struct themselves.
+        */
+       void (*release) (struct drm_device *);
+
        int (*set_busid)(struct drm_device *dev, struct drm_master *master);
 
        /**
@@ -437,6 +448,8 @@ extern unsigned int drm_debug;
 int drm_dev_init(struct drm_device *dev,
                 struct drm_driver *driver,
                 struct device *parent);
+void drm_dev_fini(struct drm_device *dev);
+
 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
                                 struct device *parent);
 int drm_dev_register(struct drm_device *dev, unsigned long flags);