linux-kernel - Re: [PATCH v12 09/11] drm/gem: Export drm_gem

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Date:   Tue, 7 Mar 2023 11:43:57 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        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>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh@...nel.org>
Cc:     intel-gfx@...ts.freedesktop.org, kernel@...labora.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v12 09/11] drm/gem: Export drm_gem_pin/unpin()

Hi

Am 05.03.23 um 23:10 schrieb Dmitry Osipenko:
> Export drm_gem_un/pin() functions. They will be used by VirtIO-GPU driver
> for pinning of an active framebuffer, preventing it from swapping out by
> memory shrinker.

Please see my reply to [10/11] on why this patch should not be used.

Best regards
Thomas

> 
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> ---
>   drivers/gpu/drm/drm_gem.c      | 2 ++
>   drivers/gpu/drm/drm_internal.h | 2 --
>   include/drm/drm_gem.h          | 3 +++
>   3 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index 3da34b121c93..6492c47b7142 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1153,12 +1153,14 @@ int drm_gem_pin(struct drm_gem_object *obj)
>   	else
>   		return 0;
>   }
> +EXPORT_SYMBOL(drm_gem_pin);
>   
>   void drm_gem_unpin(struct drm_gem_object *obj)
>   {
>   	if (obj->funcs->unpin)
>   		obj->funcs->unpin(obj);
>   }
> +EXPORT_SYMBOL(drm_gem_unpin);
>   
>   int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
>   {
> diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> index d7e023bbb0d5..55d0ee7475f7 100644
> --- a/drivers/gpu/drm/drm_internal.h
> +++ b/drivers/gpu/drm/drm_internal.h
> @@ -173,8 +173,6 @@ 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_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/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 7bd8e2bbbb36..f7703cb66569 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -493,4 +493,7 @@ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru,
>   
>   int drm_gem_evict(struct drm_gem_object *obj);
>   
> +int drm_gem_pin(struct drm_gem_object *obj);
> +void drm_gem_unpin(struct drm_gem_object *obj);
> +
>   #endif /* __DRM_GEM_H__ */

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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