linux-kernel - Re: [PATCH v14 12/12] drm/gem: Add _unlocked postfix to drm_gem

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Date:   Tue, 25 Jul 2023 09:53:03 +0200
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 v14 12/12] drm/gem: Add _unlocked postfix to
 drm_gem_pin/unpin()

On Sun, 23 Jul 2023 02:47:46 +0300
Dmitry Osipenko <dmitry.osipenko@...labora.com> wrote:

> Make clear that drm_gem_pin/unpin() functions take reservation lock by
> adding _unlocked postfix to the function names.
> 
> Suggested-by: Boris Brezillon <boris.brezillon@...labora.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

I'm still a bit confused by the fact we sometimes use the
xxx[_locked]() pattern (version without the _locked suffix takes the
lock) and other times the xxx[_unlocked]() pattern (version with the
_unlocked suffix takes the lock). It'd be good to chose one pattern and
stick to it, at least for all core functions...

> ---
>  drivers/gpu/drm/drm_gem.c      | 4 ++--
>  drivers/gpu/drm/drm_internal.h | 4 ++--
>  drivers/gpu/drm/drm_prime.c    | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index c18686f434d4..805eb0d85297 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1146,7 +1146,7 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent,
>  		obj->funcs->print_info(p, indent, obj);
>  }
>  
> -int drm_gem_pin(struct drm_gem_object *obj)
> +int drm_gem_pin_unlocked(struct drm_gem_object *obj)
>  {
>  	if (obj->funcs->pin)
>  		return obj->funcs->pin(obj);
> @@ -1154,7 +1154,7 @@ int drm_gem_pin(struct drm_gem_object *obj)
>  	return 0;
>  }
>  
> -void drm_gem_unpin(struct drm_gem_object *obj)
> +void drm_gem_unpin_unlocked(struct drm_gem_object *obj)
>  {
>  	if (obj->funcs->unpin)
>  		obj->funcs->unpin(obj);
> diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> index d7e023bbb0d5..80f5bd1da8fd 100644
> --- a/drivers/gpu/drm/drm_internal.h
> +++ b/drivers/gpu/drm/drm_internal.h
> @@ -173,8 +173,8 @@ void drm_gem_release(struct drm_device *dev, struct drm_file *file_private);
>  void drm_gem_print_info(struct drm_printer *p, unsigned int indent,
>  			const struct drm_gem_object *obj);
>  
> -int drm_gem_pin(struct drm_gem_object *obj);
> -void drm_gem_unpin(struct drm_gem_object *obj);
> +int drm_gem_pin_unlocked(struct drm_gem_object *obj);
> +void drm_gem_unpin_unlocked(struct drm_gem_object *obj);
>  int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map);
>  void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map);
>  
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 63b709a67471..8145b49e95ff 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -583,7 +583,7 @@ int drm_gem_map_attach(struct dma_buf *dma_buf,
>  	if (!obj->funcs->get_sg_table)
>  		return -ENOSYS;
>  
> -	return drm_gem_pin(obj);
> +	return drm_gem_pin_unlocked(obj);
>  }
>  EXPORT_SYMBOL(drm_gem_map_attach);
>  
> @@ -601,7 +601,7 @@ void drm_gem_map_detach(struct dma_buf *dma_buf,
>  {
>  	struct drm_gem_object *obj = dma_buf->priv;
>  
> -	drm_gem_unpin(obj);
> +	drm_gem_unpin_unlocked(obj);
>  }
>  EXPORT_SYMBOL(drm_gem_map_detach);
>