linux-kernel - Re: [PATCH v10 09/11] drm/gem: Add drm_gem_pin

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Message-ID: <d0be098d-c58f-9866-da6f-a721fa57806b@suse.de>
Date:   Fri, 17 Feb 2023 14:42:13 +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>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        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>, Sean Paul <sean@...rly.run>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     kernel@...labora.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v10 09/11] drm/gem: Add drm_gem_pin_unlocked()

I forgot this change.

Am 08.01.23 um 22:04 schrieb Dmitry Osipenko:
> Add unlocked variants of drm_gem_un/pin() functions. These new helpers
> will take care of GEM dma-reservation locking for DRM drivers.
> 
> VirtIO-GPU driver will use these helpers to pin shmem framebuffers,
> preventing them from eviction during scanout.
> 
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

Best regards
Thomas

> ---
>   drivers/gpu/drm/drm_gem.c | 29 +++++++++++++++++++++++++++++
>   include/drm/drm_gem.h     |  3 +++
>   2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index dbb48fc9dff3..0b8d3da985c7 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1167,6 +1167,35 @@ void drm_gem_unpin(struct drm_gem_object *obj)
>   		obj->funcs->unpin(obj);
>   }
>   
> +int drm_gem_pin_unlocked(struct drm_gem_object *obj)
> +{
> +	int ret;
> +
> +	if (!obj->funcs->pin)
> +		return 0;
> +
> +	ret = dma_resv_lock_interruptible(obj->resv, NULL);
> +	if (ret)
> +		return ret;
> +
> +	ret = obj->funcs->pin(obj);
> +	dma_resv_unlock(obj->resv);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_gem_pin_unlocked);
> +
> +void drm_gem_unpin_unlocked(struct drm_gem_object *obj)
> +{
> +	if (!obj->funcs->unpin)
> +		return;
> +
> +	dma_resv_lock(obj->resv, NULL);
> +	obj->funcs->unpin(obj);
> +	dma_resv_unlock(obj->resv);
> +}
> +EXPORT_SYMBOL(drm_gem_unpin_unlocked);
> +
>   int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
>   {
>   	int ret;
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 8e5c22f25691..6f6d96f79a67 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,
>   
>   bool drm_gem_object_evict(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);
> +
>   #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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