linux-kernel - Re: [PATCH v5] drm/syncobj: Extend EXPORT_SYNC

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Message-ID: <3fea4b5b-c4d1-4ac8-b351-692baad81a75@collabora.com>
Date: Tue, 1 Apr 2025 16:19:55 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc: Christian König <christian.koenig@....com>,
 Rob Clark <robdclark@...omium.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:DMA BUFFER SHARING FRAMEWORK:Keyword:bdma_(?:buf|fence|resv)b"
 <linux-media@...r.kernel.org>,
 "moderated list:DMA BUFFER SHARING FRAMEWORK:Keyword:bdma_(?:buf|fence|resv)b"
 <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH v5] drm/syncobj: Extend EXPORT_SYNC_FILE for timeline
 syncobjs

On 4/1/25 00:23, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Add support for exporting a dma_fence fd for a specific point on a
> timeline.  This is needed for vtest/vpipe[1][2] to implement timeline
> syncobj support, as it needs a way to turn a point on a timeline back
> into a dma_fence fd.  It also closes an odd omission from the syncobj
> UAPI.
> 
> [1] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33433
> [2] https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/805
> 
> v2: Add DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE
> v3: Add unstaged uabi header hunk
> v4: Also handle IMPORT_SYNC_FILE case
> v5: Address comments from Dmitry
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/drm_syncobj.c | 45 +++++++++++++++++++++++++++--------
>  include/uapi/drm/drm.h        |  4 ++++
>  2 files changed, 39 insertions(+), 10 deletions(-)

Reviewed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

-- 
Best regards,
Dmitry