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Message-ID: <f390d9ec-e8b2-a10d-bd2e-011ec879c615@arm.com>
Date: Wed, 23 Nov 2022 15:58:14 +0000
From: Steven Price <steven.price@....com>
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>,
Thomas Zimmermann <tzimmermann@...e.de>,
Rob Clark <robdclark@...il.com>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Qiang Yu <yuq825@...il.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 v9 03/11] drm/gem: Add evict() callback to
drm_gem_object_funcs
On 23/11/2022 02:57, Dmitry Osipenko wrote:
> Add new common evict() callback to drm_gem_object_funcs and corresponding
> drm_gem_object_evict() helper. This is a first step on a way to providing
> common GEM-shrinker API for DRM drivers.
>
> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> ---
> drivers/gpu/drm/drm_gem.c | 15 +++++++++++++++
> include/drm/drm_gem.h | 12 ++++++++++++
> 2 files changed, 27 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index 299bca1390aa..c0510b8080d2 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1458,3 +1458,18 @@ drm_gem_lru_scan(struct drm_gem_lru *lru,
> return freed;
> }
> EXPORT_SYMBOL(drm_gem_lru_scan);
> +
> +/**
> + * drm_gem_object_evict - helper to evict backing pages for a GEM object
> + * @obj: obj in question
> + */
> +bool
> +drm_gem_object_evict(struct drm_gem_object *obj)
> +{
> + dma_resv_assert_held(obj->resv);
> +
> + if (obj->funcs->evict)
> + return obj->funcs->evict(obj);
> +
> + return false;
> +}
This function needs exporting for the module build to work correctly.
Steve
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index b46ade812443..add1371453f0 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -172,6 +172,16 @@ struct drm_gem_object_funcs {
> * This is optional but necessary for mmap support.
> */
> const struct vm_operations_struct *vm_ops;
> +
> + /**
> + * @evict:
> + *
> + * Evicts gem object out from memory. Used by the drm_gem_object_evict()
> + * helper. Returns true on success, false otherwise.
> + *
> + * This callback is optional.
> + */
> + bool (*evict)(struct drm_gem_object *obj);
> };
>
> /**
> @@ -480,4 +490,6 @@ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru,
> unsigned long *remaining,
> bool (*shrink)(struct drm_gem_object *obj));
>
> +bool drm_gem_object_evict(struct drm_gem_object *obj);
> +
> #endif /* __DRM_GEM_H__ */
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