Add a notifier that fires when a new DRM device is registered. This can be used by the bootsplash client to connect to all devices.
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/drm_drv.c | 32 ++++++++++++++++++++++++++++++++ include/drm/drm_drv.h | 4 ++++ 2 files changed, 36 insertions(+)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 6f21bafb29be..e42ce320ad07 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -31,6 +31,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/mount.h> +#include <linux/notifier.h> #include <linux/slab.h> #include <linux/srcu.h>
@@ -79,6 +80,8 @@ static struct dentry *drm_debugfs_root;
DEFINE_STATIC_SRCU(drm_unplug_srcu);
+static BLOCKING_NOTIFIER_HEAD(drm_dev_notifier); + /* * DRM Minors * A DRM device can provide several char-dev interfaces on the DRM-Major. Each @@ -837,6 +840,8 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags) dev->dev ? dev_name(dev->dev) : "virtual device", dev->primary->index);
+ blocking_notifier_call_chain(&drm_dev_notifier, 0, dev); + goto out_unlock;
err_minors: @@ -894,6 +899,33 @@ void drm_dev_unregister(struct drm_device *dev) } EXPORT_SYMBOL(drm_dev_unregister);
+/** + * drm_dev_register_notifier - Register a notifier for new DRM devices + * @nb: Notifier block + * + * Register a notifier that fires when a new &drm_device is registered. + * + * Note: + * Users of this function has to be linked into drm.ko. This is done to make + * life simple avoiding tricky race situations. + */ +void drm_dev_register_notifier(struct notifier_block *nb) +{ + /* Currently this can't fail, but catch it in case this changes */ + WARN_ON(blocking_notifier_chain_register(&drm_dev_notifier, nb)); +} + +/** + * drm_dev_unregister_notifier - Unregister DRM device notifier + * @nb: Notifier block + * + * This is a no-op if the notifier isn't registered. + */ +void drm_dev_unregister_notifier(struct notifier_block *nb) +{ + blocking_notifier_chain_unregister(&drm_dev_notifier, nb); +} + /** * drm_dev_set_unique - Set the unique name of a DRM device * @dev: device of which to set the unique name diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index 13356e6fd40c..5e6c6ed0d59d 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -40,6 +40,7 @@ struct drm_minor; struct dma_buf_attachment; struct drm_display_mode; struct drm_mode_create_dumb; +struct notifier_block; struct drm_printer;
/* driver capabilities and requirements mask */ @@ -641,6 +642,9 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver, int drm_dev_register(struct drm_device *dev, unsigned long flags); void drm_dev_unregister(struct drm_device *dev);
+void drm_dev_register_notifier(struct notifier_block *nb); +void drm_dev_unregister_notifier(struct notifier_block *nb); + void drm_dev_get(struct drm_device *dev); void drm_dev_put(struct drm_device *dev); void drm_dev_unref(struct drm_device *dev);