Hi Chris,
Thank you for the patch.
On Saturday 21 Jan 2017 10:58:25 Chris Wilson wrote:
> 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 responsible 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
This takes my comments into account, thank you for that. Do you have a patch
that shows usage of the release callback in a driver ?
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> ---
> drivers/gpu/drm/drm_drv.c | 56 ++++++++++++++++++++++++++++++--------------
> include/drm/drm_drv.h | 11 ++++++++++
> 2 files changed, 50 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 1b11ab628da7..517718e4f6e4 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -553,6 +553,39 @@ int drm_dev_init(struct drm_device *dev,
> 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 state allocated by it. All driver state should be finalized
> + * first. Note that this function does not free the @dev, that is left to
> the + * caller. drm_dev_fini() should only
> + *
> + * 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)
> +{
> + 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
> @@ -598,23 +631,12 @@ static void drm_dev_release(struct kref *ref)
> {
> struct drm_device *dev = container_of(ref, struct drm_device, ref);
>
> - 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 34ece393c639..bc5865ad0bbd 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -103,6 +103,15 @@ struct drm_driver {
> *
> */
> void (*unload) (struct drm_device *);
> +
> + /**
> + * @release:
> + *
> + * Optional callback for destroying device state after the final
> + * reference is released, i.e. the device is being destroyed.
> + */
> + void (*release) (struct drm_device *);
> +
> int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file
> *file_priv); int (*dma_quiescent) (struct drm_device *);
> int (*context_dtor) (struct drm_device *dev, int context);
> @@ -451,6 +460,8 @@ 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);
--
Regards,
Laurent Pinchart
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