Re: [PATCH 06/20] drm/i915: Introduce GEM object functions

[Jani Nikula <jani.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On Thu, 13 Aug 2020, Thomas Zimmermann <tzimmermann-l3A5Bk7waGM@public.gmane.org> wrote:
> GEM object functions deprecate several similar callback interfaces in
> struct drm_driver. This patch replaces the per-driver callbacks with
> per-instance callbacks in i915.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann-l3A5Bk7waGM@public.gmane.org>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_object.c       |  9 ++++++++-
>  drivers/gpu/drm/i915/i915_drv.c                  | 10 ++++++----
>  drivers/gpu/drm/i915/i915_drv.h                  |  1 +
>  drivers/gpu/drm/i915/selftests/mock_gem_device.c |  3 ---
>  4 files changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> index c8421fd9d2dc..bc15ee4f2bd5 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> @@ -41,7 +41,14 @@ static struct i915_global_object {
>  
>  struct drm_i915_gem_object *i915_gem_object_alloc(void)
>  {
> -	return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
> +	struct drm_i915_gem_object *obj;
> +
> +	obj = kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
> +	if (!obj)
> +		return NULL;
> +	obj->base.funcs = &i915_gem_object_funcs;
> +
> +	return obj;
>  }
>  
>  void i915_gem_object_free(struct drm_i915_gem_object *obj)
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 068447f565a9..b09eee11c540 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1840,6 +1840,12 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
>  	DRM_IOCTL_DEF_DRV(I915_GEM_VM_DESTROY, i915_gem_vm_destroy_ioctl, DRM_RENDER_ALLOW),
>  };
>  
> +const struct drm_gem_object_funcs i915_gem_object_funcs = {
> +	.free = i915_gem_free_object,
> +	.close = i915_gem_close_object,
> +	.export = i915_gem_prime_export,
> +};
> +

Any reason not to make this static in i915_gem_object.c next to its only
user?

BR,
Jani.


>  static struct drm_driver driver = {
>  	/* Don't use MTRRs here; the Xserver or userspace app should
>  	 * deal with them for Intel hardware.
> @@ -1853,12 +1859,8 @@ static struct drm_driver driver = {
>  	.lastclose = i915_driver_lastclose,
>  	.postclose = i915_driver_postclose,
>  
> -	.gem_close_object = i915_gem_close_object,
> -	.gem_free_object_unlocked = i915_gem_free_object,
> -
>  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> -	.gem_prime_export = i915_gem_prime_export,
>  	.gem_prime_import = i915_gem_prime_import,
>  
>  	.dumb_create = i915_gem_dumb_create,
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index bacb4c762f5b..666db65fe69e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1736,6 +1736,7 @@ intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *dev_priv)
>  
>  /* i915_drv.c */
>  extern const struct dev_pm_ops i915_pm_ops;
> +extern const struct drm_gem_object_funcs i915_gem_object_funcs;
>  
>  int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
>  void i915_driver_remove(struct drm_i915_private *i915);
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> index ce4d4303229c..4725dad63e0a 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> @@ -86,9 +86,6 @@ static struct drm_driver mock_driver = {
>  	.name = "mock",
>  	.driver_features = DRIVER_GEM,
>  	.release = mock_device_release,
> -
> -	.gem_close_object = i915_gem_close_object,
> -	.gem_free_object_unlocked = i915_gem_free_object,
>  };
>  
>  static void release_dev(struct device *dev)

-- 
Jani Nikula, Intel Open Source Graphics Center