linux-kernel - Re: [PATCH v19 13/30] drm/shmem-helper: Make drm_gem_shmem_get

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Date: Thu, 25 Jan 2024 09:02:13 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc: David Airlie <airlied@...il.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, Christian König
 <christian.koenig@....com>, Qiang Yu <yuq825@...il.com>, Steven Price
 <steven.price@....com>, Emma Anholt <emma@...olt.net>, Melissa Wen
 <mwen@...lia.com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, kernel@...labora.com,
 virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v19 13/30] drm/shmem-helper: Make
 drm_gem_shmem_get_pages() public

On Fri,  5 Jan 2024 21:46:07 +0300
Dmitry Osipenko <dmitry.osipenko@...labora.com> wrote:

> We're going to move away from having implicit get_pages() done by
> get_pages_sgt() to simplify refcnt handling. Drivers will manage
> get/put_pages() by themselves. Expose the drm_gem_shmem_get_pages()
> in a public drm-shmem API.
> 
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 10 +++++++++-
>  include/drm/drm_gem_shmem_helper.h     |  1 +
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 799a3c5015ad..dc416a4bce1b 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -228,7 +228,14 @@ void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem)
>  }
>  EXPORT_SYMBOL_GPL(drm_gem_shmem_put_pages_locked);
>  
> -static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
> +/*
> + * drm_gem_shmem_get_pages - Increase use count on the backing pages for a shmem GEM object
> + * @shmem: shmem GEM object
> + *
> + * This function Increases the use count and allocates the backing pages if
> + * use-count equals to zero.
> + */
> +int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
>  {
>  	int ret;
>  
> @@ -241,6 +248,7 @@ static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
>  
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages);
>  
>  static int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
>  {
> diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h
> index 18020f653d7e..6dedc0739fbc 100644
> --- a/include/drm/drm_gem_shmem_helper.h
> +++ b/include/drm/drm_gem_shmem_helper.h
> @@ -110,6 +110,7 @@ struct drm_gem_shmem_object {
>  struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
>  void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem);
>  
> +int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem);
>  void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem);
>  int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem);
>  void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem);