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| author | Nicolas Dufresne <nicolas.dufresne@collabora.com> | 2025-12-05 04:54:24 +0300 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2026-01-05 17:56:31 +0300 |
| commit | db6b97a4f8041e479be9ef4b8b07022636c96f50 (patch) | |
| tree | 410fd48a8f331a8a0f7887018411164785fe8e9e /include | |
| parent | 3e92d7e4935084ecdbdc88880cc4688618ae1557 (diff) | |
| download | linux-db6b97a4f8041e479be9ef4b8b07022636c96f50.tar.xz | |
media: v4l2-mem2mem: Add a kref to the v4l2_m2m_dev structure
Adding a reference count to the v4l2_m2m_dev structure allow safely
sharing it across multiple hardware nodes. This can be used to prevent
running jobs concurrently on m2m cores that have some internal resource
sharing.
Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
[hverkuil: fix typos in v4l2_m2m_put documentation]
Diffstat (limited to 'include')
| -rw-r--r-- | include/media/v4l2-mem2mem.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h index bf6a09a04dcf..31de25d792b9 100644 --- a/include/media/v4l2-mem2mem.h +++ b/include/media/v4l2-mem2mem.h @@ -548,6 +548,27 @@ v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev, void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev); /** + * v4l2_m2m_get() - take a reference to the m2m_dev structure + * + * @m2m_dev: opaque pointer to the internal data to handle M2M context + * + * This is used to share the M2M device across multiple devices. This + * can be used to avoid scheduling two hardware nodes concurrently. + */ +void v4l2_m2m_get(struct v4l2_m2m_dev *m2m_dev); + +/** + * v4l2_m2m_put() - remove a reference to the m2m_dev structure + * + * @m2m_dev: opaque pointer to the internal data to handle M2M context + * + * Once the M2M device has no more references, v4l2_m2m_release() will be + * called automatically. Users of this method should never call + * v4l2_m2m_release() directly. See v4l2_m2m_get() for more details. + */ +void v4l2_m2m_put(struct v4l2_m2m_dev *m2m_dev); + +/** * v4l2_m2m_ctx_init() - allocate and initialize a m2m context * * @m2m_dev: opaque pointer to the internal data to handle M2M context |