| Message ID | 20230824092133.39510-10-benjamin.gaignard@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add DELETE_BUF ioctl | expand |
On 24/08/2023 11:21, Benjamin Gaignard wrote: > VIDIOC_DELETE_BUFS ioctl allows to delete buffers from a queue. > The number of buffers to delete in given by count field of > struct v4l2_delete_buffers and the range start at the index > specified in the same structure. > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> > --- > .../userspace-api/media/v4l/user-func.rst | 1 + > .../media/v4l/vidioc-delete-bufs.rst | 73 +++++++++++++++++++ > .../media/common/videobuf2/videobuf2-core.c | 34 +++++++++ > .../media/common/videobuf2/videobuf2-v4l2.c | 16 ++++ > drivers/media/v4l2-core/v4l2-dev.c | 1 + > drivers/media/v4l2-core/v4l2-ioctl.c | 17 +++++ > include/media/v4l2-ioctl.h | 4 + > include/media/videobuf2-core.h | 9 +++ > include/media/videobuf2-v4l2.h | 11 +++ > include/uapi/linux/videodev2.h | 17 +++++ > 10 files changed, 183 insertions(+) > create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > > diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst > index 15ff0bf7bbe6..3fd567695477 100644 > --- a/Documentation/userspace-api/media/v4l/user-func.rst > +++ b/Documentation/userspace-api/media/v4l/user-func.rst > @@ -17,6 +17,7 @@ Function Reference > vidioc-dbg-g-chip-info > vidioc-dbg-g-register > vidioc-decoder-cmd > + vidioc-delete-bufs > vidioc-dqevent > vidioc-dv-timings-cap > vidioc-encoder-cmd > diff --git a/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > new file mode 100644 > index 000000000000..a55fe6331fc8 > --- /dev/null > +++ b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > @@ -0,0 +1,73 @@ > +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later > +.. c:namespace:: V4L > + > +.. _VIDIOC_DELETE_BUFS: > + > +************************ > +ioctl VIDIOC_DELETE_BUFS > +************************ > + > +Name > +==== > + > +VIDIOC_DELETE_BUFS - Deletes buffers from a queue > + > +Synopsis > +======== > + > +.. c:macro:: VIDIOC_DELETE_BUFs > + > +``int ioctl(int fd, VIDIOC_DELETE_BUFs, struct v4l2_delete_buffers *argp)`` > + > +Arguments > +========= > + > +``fd`` > + File descriptor returned by :c:func:`open()`. > + > +``argp`` > + Pointer to struct :c:type:`v4l2_delete_buffers`. > + > +Description > +=========== > + > +Applications can optionally call the :ref:`VIDIOC_DELETE_BUFS` ioctl to > +delete buffers from a queue. > + > +.. c:type:: v4l2_delete_buffers > + > +.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}| > + > +.. flat-table:: struct v4l2_delete_buffers > + :header-rows: 0 > + :stub-columns: 0 > + :widths: 1 1 2 > + > + * - __u32 > + - ``index`` > + - The starting buffer index to delete. > + * - __u32 > + - ``count`` > + - The number of buffers to be deleted. > + * - __u32 > + - ``type`` > + - Type of the stream or buffers, this is the same as the struct > + :c:type:`v4l2_format` ``type`` field. See > + :c:type:`v4l2_buf_type` for valid values. > + * - __u32 > + - ``reserved``\ [13] > + - A place holder for future extensions. Drivers and applications > + must set the array to zero. > + > +Return Value > +============ > + > +On success 0 is returned, on error -1 and the ``errno`` variable is set > +appropriately. The generic error codes are described at the > +:ref:`Generic Error Codes <gen-errors>` chapter. > + > +EBUSY > + File I/O is in progress. > + > +EINVAL > + The buffer ``index`` doesn't exist in the queue. > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c > index 70e36389b704..3d915b4c33b2 100644 > --- a/drivers/media/common/videobuf2/videobuf2-core.c > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > @@ -1634,6 +1634,40 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb) > } > EXPORT_SYMBOL_GPL(vb2_core_prepare_buf); > > +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index) Same as the other core functions: rather than an index, pass a valid vb2_buffer pointer. Let the caller do the validation. My rule of thumb is that the core code should only need to call vb2_get_buffer() if it is walking over all buffers (i.e. in a for-loop). For functions like this it should get the vb pointer directly rather than having to look it up, since the caller should have done that already. > +{ > + struct vb2_buffer *vb; > + > + vb = vb2_get_buffer(q, index); > + if (!vb) { > + dprintk(q, 1, "invalid buffer index %d\n", index); > + return -EINVAL; > + } > + > + if (vb->state != VB2_BUF_STATE_DEQUEUED) { > + dprintk(q, 1, "can't delete non dequeued buffer index %d\n", index); > + return -EINVAL; > + } > + > + if (vb->planes[0].mem_priv) > + call_void_vb_qop(vb, buf_cleanup, vb); > + > + /* Free MMAP buffers or release USERPTR buffers */ > + if (q->memory == VB2_MEMORY_MMAP) > + __vb2_buf_mem_free(vb); > + else if (q->memory == VB2_MEMORY_DMABUF) > + __vb2_buf_dmabuf_put(vb); > + else > + __vb2_buf_userptr_put(vb); > + > + vb2_queue_remove_buffer(q, vb); When freeing all buffers (REQBUFS with count=0) the q->mmap_lock is taken. I wonder if the same has to happen here. You don't want userspace to call mmap while deleting a buffer. I also think this should be refactored since __vb2_queue_free/__vb2_free_mem need to do the same thing. > + kfree(vb); > + > + dprintk(q, 2, "buffer %d deleted\n", index); > + return 0; > +} > +EXPORT_SYMBOL_GPL(vb2_core_delete_buf); > + > /* > * vb2_start_streaming() - Attempt to start streaming. > * @q: videobuf2 queue > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c > index 724135d41f7f..ffe6b66a27f1 100644 > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > @@ -751,6 +751,22 @@ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, > } > EXPORT_SYMBOL_GPL(vb2_prepare_buf); > > +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d) > +{ > + unsigned int index; > + int ret = 0; > + Add a check if index < q->num_buffers, count < q->num_buffers and that the sum of the two <= q->num_buffers. I.e., basic sanity checks. Return -EINVAL if that's the case. > + for (index = d->index; index < d->index + d->count; index++) { > + ret = vb2_core_delete_buf(q, index); > + if (ret) > + break; > + } > + > + d->index = index; Hmm. I wonder if vb2_core_delete_buf shouldn't be void, and instead verify here first that all buffers your want to delete 1) exist, and 2) are in state DEQUEUED. > + return ret; > +} > +EXPORT_SYMBOL_GPL(vb2_delete_bufs); > + > int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) > { > unsigned requested_planes = 1; > diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c > index f81279492682..215654fd6581 100644 > --- a/drivers/media/v4l2-core/v4l2-dev.c > +++ b/drivers/media/v4l2-core/v4l2-dev.c > @@ -720,6 +720,7 @@ static void determine_valid_ioctls(struct video_device *vdev) > SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); > SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); > SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); > + SET_VALID_IOCTL(ops, VIDIOC_DELETE_BUFS, vidioc_delete_bufs); > } > > if (is_vid || is_vbi || is_meta) { > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > index f4d9d6279094..32336b9bb7e4 100644 > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > @@ -489,6 +489,13 @@ static void v4l_print_create_buffers(const void *arg, bool write_only) > v4l_print_format(&p->format, write_only); > } > > +static void v4l_print_delete_buffers(const void *arg, bool write_only) > +{ > + const struct v4l2_delete_buffers *p = arg; > + > + pr_cont("index=%d, count=%d\n", p->index, p->count); > +} > + > static void v4l_print_streamparm(const void *arg, bool write_only) > { > const struct v4l2_streamparm *p = arg; > @@ -2160,6 +2167,15 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops, > return ret ? ret : ops->vidioc_prepare_buf(file, fh, b); > } > > +static int v4l_delete_bufs(const struct v4l2_ioctl_ops *ops, > + struct file *file, void *fh, void *arg) > +{ > + struct v4l2_delete_buffers *delete = arg; > + int ret = check_fmt(file, delete->type); > + > + return ret ? ret : ops->vidioc_delete_bufs(file, fh, delete); > +} > + > static int v4l_g_parm(const struct v4l2_ioctl_ops *ops, > struct file *file, void *fh, void *arg) > { > @@ -2909,6 +2925,7 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = { > IOCTL_INFO(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0), > IOCTL_INFO(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)), > IOCTL_INFO(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)), > + IOCTL_INFO(VIDIOC_DELETE_BUFS, v4l_delete_bufs, v4l_print_delete_buffers, INFO_FL_QUEUE), You can add INFO_FL_CLEAR here to automatically zero the reserved field. It also needs INFO_FL_PRIO. > }; > #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) > > diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h > index edb733f21604..55afbde54211 100644 > --- a/include/media/v4l2-ioctl.h > +++ b/include/media/v4l2-ioctl.h > @@ -163,6 +163,8 @@ struct v4l2_fh; > * :ref:`VIDIOC_CREATE_BUFS <vidioc_create_bufs>` ioctl > * @vidioc_prepare_buf: pointer to the function that implements > * :ref:`VIDIOC_PREPARE_BUF <vidioc_prepare_buf>` ioctl > + * @vidioc_delete_bufs: pointer to the function that implements > + * :ref:`VIDIOC_DELETE_BUFS <vidioc_delete_bufs>` ioctl > * @vidioc_overlay: pointer to the function that implements > * :ref:`VIDIOC_OVERLAY <vidioc_overlay>` ioctl > * @vidioc_g_fbuf: pointer to the function that implements > @@ -422,6 +424,8 @@ struct v4l2_ioctl_ops { > struct v4l2_create_buffers *b); > int (*vidioc_prepare_buf)(struct file *file, void *fh, > struct v4l2_buffer *b); > + int (*vidioc_delete_bufs)(struct file *file, void *fh, > + struct v4l2_delete_buffers *d); > > int (*vidioc_overlay)(struct file *file, void *fh, unsigned int i); > int (*vidioc_g_fbuf)(struct file *file, void *fh, > diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h > index ee9161b9fd64..c9ecc4214982 100644 > --- a/include/media/videobuf2-core.h > +++ b/include/media/videobuf2-core.h > @@ -843,6 +843,15 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > */ > int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb); > > +/** > + * vb2_core_delete_buf() - > + * @q: pointer to &struct vb2_queue with videobuf2 queue. > + * @index: id number of the buffer. > + * > + * Return: returns zero on success; an error code otherwise. > + */ > +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index); > + > /** > * vb2_core_qbuf() - Queue a buffer from userspace > * > diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h > index 5a845887850b..2ef68fdf388f 100644 > --- a/include/media/videobuf2-v4l2.h > +++ b/include/media/videobuf2-v4l2.h > @@ -118,6 +118,17 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); > */ > int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, > struct v4l2_buffer *b); > +/** > + * vb2_delete_bufs() - Delete buffers from the queue > + * > + * @q: pointer to &struct vb2_queue with videobuf2 queue. > + * @d: delete parameter, passed from userspace to > + * &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver > + * > + * The return values from this function are intended to be directly returned > + * from &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver. > + */ > +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d); > > /** > * vb2_qbuf() - Queue a buffer from userspace > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h > index 78260e5d9985..4807b38e2a6f 100644 > --- a/include/uapi/linux/videodev2.h > +++ b/include/uapi/linux/videodev2.h > @@ -2616,6 +2616,21 @@ struct v4l2_create_buffers { > __u32 reserved[6]; > }; > > +/** > + * struct v4l2_delete_buffers - VIDIOC_DELETE_BUFS argument > + * @index: the first buffer to be deleted > + * @count: number of buffers to delete > + * @type: enum v4l2_buf_type; buffer type (type == *_MPLANE for > + * multiplanar buffers); I would drop the bit between (). That seems overkill to me. > + * @reserved: futur extensions futur -> future > + */ > +struct v4l2_delete_buffers { > + __u32 index; > + __u32 count; > + __u32 type; > + __u32 reserved[13]; > +}; > + > /* > * I O C T L C O D E S F O R V I D E O D E V I C E S > * > @@ -2715,6 +2730,8 @@ struct v4l2_create_buffers { > #define VIDIOC_DBG_G_CHIP_INFO _IOWR('V', 102, struct v4l2_dbg_chip_info) > > #define VIDIOC_QUERY_EXT_CTRL _IOWR('V', 103, struct v4l2_query_ext_ctrl) > +#define VIDIOC_DELETE_BUFS _IOWR('V', 104, struct v4l2_delete_buffers) > + > > /* Reminder: when adding new ioctls please add support for them to > drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */ Regards, Hans
On 24/08/2023 11:21, Benjamin Gaignard wrote: > VIDIOC_DELETE_BUFS ioctl allows to delete buffers from a queue. > The number of buffers to delete in given by count field of > struct v4l2_delete_buffers and the range start at the index > specified in the same structure. > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> > --- > .../userspace-api/media/v4l/user-func.rst | 1 + > .../media/v4l/vidioc-delete-bufs.rst | 73 +++++++++++++++++++ > .../media/common/videobuf2/videobuf2-core.c | 34 +++++++++ > .../media/common/videobuf2/videobuf2-v4l2.c | 16 ++++ > drivers/media/v4l2-core/v4l2-dev.c | 1 + > drivers/media/v4l2-core/v4l2-ioctl.c | 17 +++++ > include/media/v4l2-ioctl.h | 4 + > include/media/videobuf2-core.h | 9 +++ > include/media/videobuf2-v4l2.h | 11 +++ > include/uapi/linux/videodev2.h | 17 +++++ > 10 files changed, 183 insertions(+) > create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > > diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst > index 15ff0bf7bbe6..3fd567695477 100644 > --- a/Documentation/userspace-api/media/v4l/user-func.rst > +++ b/Documentation/userspace-api/media/v4l/user-func.rst > @@ -17,6 +17,7 @@ Function Reference > vidioc-dbg-g-chip-info > vidioc-dbg-g-register > vidioc-decoder-cmd > + vidioc-delete-bufs > vidioc-dqevent > vidioc-dv-timings-cap > vidioc-encoder-cmd > diff --git a/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > new file mode 100644 > index 000000000000..a55fe6331fc8 > --- /dev/null > +++ b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst > @@ -0,0 +1,73 @@ > +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later > +.. c:namespace:: V4L > + > +.. _VIDIOC_DELETE_BUFS: > + > +************************ > +ioctl VIDIOC_DELETE_BUFS > +************************ > + > +Name > +==== > + > +VIDIOC_DELETE_BUFS - Deletes buffers from a queue > + > +Synopsis > +======== > + > +.. c:macro:: VIDIOC_DELETE_BUFs > + > +``int ioctl(int fd, VIDIOC_DELETE_BUFs, struct v4l2_delete_buffers *argp)`` > + > +Arguments > +========= > + > +``fd`` > + File descriptor returned by :c:func:`open()`. > + > +``argp`` > + Pointer to struct :c:type:`v4l2_delete_buffers`. > + > +Description > +=========== > + > +Applications can optionally call the :ref:`VIDIOC_DELETE_BUFS` ioctl to > +delete buffers from a queue. > + > +.. c:type:: v4l2_delete_buffers > + > +.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}| > + > +.. flat-table:: struct v4l2_delete_buffers > + :header-rows: 0 > + :stub-columns: 0 > + :widths: 1 1 2 > + > + * - __u32 > + - ``index`` > + - The starting buffer index to delete. > + * - __u32 > + - ``count`` > + - The number of buffers to be deleted. > + * - __u32 > + - ``type`` > + - Type of the stream or buffers, this is the same as the struct > + :c:type:`v4l2_format` ``type`` field. See > + :c:type:`v4l2_buf_type` for valid values. > + * - __u32 > + - ``reserved``\ [13] > + - A place holder for future extensions. Drivers and applications > + must set the array to zero. > + > +Return Value > +============ > + > +On success 0 is returned, on error -1 and the ``errno`` variable is set > +appropriately. The generic error codes are described at the > +:ref:`Generic Error Codes <gen-errors>` chapter. > + > +EBUSY > + File I/O is in progress. > + > +EINVAL > + The buffer ``index`` doesn't exist in the queue. > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c > index 70e36389b704..3d915b4c33b2 100644 > --- a/drivers/media/common/videobuf2/videobuf2-core.c > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > @@ -1634,6 +1634,40 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb) > } > EXPORT_SYMBOL_GPL(vb2_core_prepare_buf); > > +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index) I didn't realize this the first time I reviewed this, but I would suggest that you change this to vb2_core_delete_bufs(struct vb2_queue *q, unsigned int index, unsigned int count) This is consistent with vb2_core_create_bufs, and I strongly suspect it will help with locking (mmap_lock), since you don't need to lock for every buffer you delete, you can do it up front. And you can move the index/count validation to the core as well, that will help if e.g. dvb would want to use this ioctl in the future. Regards, Hans
Le 30/08/2023 à 15:45, Hans Verkuil a écrit : > On 24/08/2023 11:21, Benjamin Gaignard wrote: >> VIDIOC_DELETE_BUFS ioctl allows to delete buffers from a queue. >> The number of buffers to delete in given by count field of >> struct v4l2_delete_buffers and the range start at the index >> specified in the same structure. >> >> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> >> --- >> .../userspace-api/media/v4l/user-func.rst | 1 + >> .../media/v4l/vidioc-delete-bufs.rst | 73 +++++++++++++++++++ >> .../media/common/videobuf2/videobuf2-core.c | 34 +++++++++ >> .../media/common/videobuf2/videobuf2-v4l2.c | 16 ++++ >> drivers/media/v4l2-core/v4l2-dev.c | 1 + >> drivers/media/v4l2-core/v4l2-ioctl.c | 17 +++++ >> include/media/v4l2-ioctl.h | 4 + >> include/media/videobuf2-core.h | 9 +++ >> include/media/videobuf2-v4l2.h | 11 +++ >> include/uapi/linux/videodev2.h | 17 +++++ >> 10 files changed, 183 insertions(+) >> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst >> >> diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst >> index 15ff0bf7bbe6..3fd567695477 100644 >> --- a/Documentation/userspace-api/media/v4l/user-func.rst >> +++ b/Documentation/userspace-api/media/v4l/user-func.rst >> @@ -17,6 +17,7 @@ Function Reference >> vidioc-dbg-g-chip-info >> vidioc-dbg-g-register >> vidioc-decoder-cmd >> + vidioc-delete-bufs >> vidioc-dqevent >> vidioc-dv-timings-cap >> vidioc-encoder-cmd >> diff --git a/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst >> new file mode 100644 >> index 000000000000..a55fe6331fc8 >> --- /dev/null >> +++ b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst >> @@ -0,0 +1,73 @@ >> +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later >> +.. c:namespace:: V4L >> + >> +.. _VIDIOC_DELETE_BUFS: >> + >> +************************ >> +ioctl VIDIOC_DELETE_BUFS >> +************************ >> + >> +Name >> +==== >> + >> +VIDIOC_DELETE_BUFS - Deletes buffers from a queue >> + >> +Synopsis >> +======== >> + >> +.. c:macro:: VIDIOC_DELETE_BUFs >> + >> +``int ioctl(int fd, VIDIOC_DELETE_BUFs, struct v4l2_delete_buffers *argp)`` >> + >> +Arguments >> +========= >> + >> +``fd`` >> + File descriptor returned by :c:func:`open()`. >> + >> +``argp`` >> + Pointer to struct :c:type:`v4l2_delete_buffers`. >> + >> +Description >> +=========== >> + >> +Applications can optionally call the :ref:`VIDIOC_DELETE_BUFS` ioctl to >> +delete buffers from a queue. >> + >> +.. c:type:: v4l2_delete_buffers >> + >> +.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}| >> + >> +.. flat-table:: struct v4l2_delete_buffers >> + :header-rows: 0 >> + :stub-columns: 0 >> + :widths: 1 1 2 >> + >> + * - __u32 >> + - ``index`` >> + - The starting buffer index to delete. >> + * - __u32 >> + - ``count`` >> + - The number of buffers to be deleted. >> + * - __u32 >> + - ``type`` >> + - Type of the stream or buffers, this is the same as the struct >> + :c:type:`v4l2_format` ``type`` field. See >> + :c:type:`v4l2_buf_type` for valid values. >> + * - __u32 >> + - ``reserved``\ [13] >> + - A place holder for future extensions. Drivers and applications >> + must set the array to zero. >> + >> +Return Value >> +============ >> + >> +On success 0 is returned, on error -1 and the ``errno`` variable is set >> +appropriately. The generic error codes are described at the >> +:ref:`Generic Error Codes <gen-errors>` chapter. >> + >> +EBUSY >> + File I/O is in progress. >> + >> +EINVAL >> + The buffer ``index`` doesn't exist in the queue. >> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c >> index 70e36389b704..3d915b4c33b2 100644 >> --- a/drivers/media/common/videobuf2/videobuf2-core.c >> +++ b/drivers/media/common/videobuf2/videobuf2-core.c >> @@ -1634,6 +1634,40 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb) >> } >> EXPORT_SYMBOL_GPL(vb2_core_prepare_buf); >> >> +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index) > Same as the other core functions: rather than an index, pass a valid > vb2_buffer pointer. Let the caller do the validation. > > My rule of thumb is that the core code should only need to call > vb2_get_buffer() if it is walking over all buffers (i.e. in a > for-loop). For functions like this it should get the vb pointer > directly rather than having to look it up, since the caller > should have done that already. > >> +{ >> + struct vb2_buffer *vb; >> + >> + vb = vb2_get_buffer(q, index); >> + if (!vb) { >> + dprintk(q, 1, "invalid buffer index %d\n", index); >> + return -EINVAL; >> + } >> + >> + if (vb->state != VB2_BUF_STATE_DEQUEUED) { >> + dprintk(q, 1, "can't delete non dequeued buffer index %d\n", index); >> + return -EINVAL; >> + } >> + >> + if (vb->planes[0].mem_priv) >> + call_void_vb_qop(vb, buf_cleanup, vb); >> + >> + /* Free MMAP buffers or release USERPTR buffers */ >> + if (q->memory == VB2_MEMORY_MMAP) >> + __vb2_buf_mem_free(vb); >> + else if (q->memory == VB2_MEMORY_DMABUF) >> + __vb2_buf_dmabuf_put(vb); >> + else >> + __vb2_buf_userptr_put(vb); >> + >> + vb2_queue_remove_buffer(q, vb); > When freeing all buffers (REQBUFS with count=0) the q->mmap_lock is taken. > I wonder if the same has to happen here. You don't want userspace to call mmap > while deleting a buffer. > > I also think this should be refactored since __vb2_queue_free/__vb2_free_mem > need to do the same thing. > >> + kfree(vb); >> + >> + dprintk(q, 2, "buffer %d deleted\n", index); >> + return 0; >> +} >> +EXPORT_SYMBOL_GPL(vb2_core_delete_buf); >> + >> /* >> * vb2_start_streaming() - Attempt to start streaming. >> * @q: videobuf2 queue >> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c >> index 724135d41f7f..ffe6b66a27f1 100644 >> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c >> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c >> @@ -751,6 +751,22 @@ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, >> } >> EXPORT_SYMBOL_GPL(vb2_prepare_buf); >> >> +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d) >> +{ >> + unsigned int index; >> + int ret = 0; >> + > Add a check if index < q->num_buffers, count < q->num_buffers and that > the sum of the two <= q->num_buffers. I.e., basic sanity checks. > > Return -EINVAL if that's the case. > >> + for (index = d->index; index < d->index + d->count; index++) { >> + ret = vb2_core_delete_buf(q, index); >> + if (ret) >> + break; >> + } >> + >> + d->index = index; > Hmm. I wonder if vb2_core_delete_buf shouldn't be void, and instead > verify here first that all buffers your want to delete 1) exist, and > 2) are in state DEQUEUED. I will keep using vb2_core_delete_buf() because it use static functions videobuf2-core.c and I don't want to change all of them. > >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(vb2_delete_bufs); >> + >> int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) >> { >> unsigned requested_planes = 1; >> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c >> index f81279492682..215654fd6581 100644 >> --- a/drivers/media/v4l2-core/v4l2-dev.c >> +++ b/drivers/media/v4l2-core/v4l2-dev.c >> @@ -720,6 +720,7 @@ static void determine_valid_ioctls(struct video_device *vdev) >> SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); >> SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); >> SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); >> + SET_VALID_IOCTL(ops, VIDIOC_DELETE_BUFS, vidioc_delete_bufs); >> } >> >> if (is_vid || is_vbi || is_meta) { >> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c >> index f4d9d6279094..32336b9bb7e4 100644 >> --- a/drivers/media/v4l2-core/v4l2-ioctl.c >> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c >> @@ -489,6 +489,13 @@ static void v4l_print_create_buffers(const void *arg, bool write_only) >> v4l_print_format(&p->format, write_only); >> } >> >> +static void v4l_print_delete_buffers(const void *arg, bool write_only) >> +{ >> + const struct v4l2_delete_buffers *p = arg; >> + >> + pr_cont("index=%d, count=%d\n", p->index, p->count); >> +} >> + >> static void v4l_print_streamparm(const void *arg, bool write_only) >> { >> const struct v4l2_streamparm *p = arg; >> @@ -2160,6 +2167,15 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops, >> return ret ? ret : ops->vidioc_prepare_buf(file, fh, b); >> } >> >> +static int v4l_delete_bufs(const struct v4l2_ioctl_ops *ops, >> + struct file *file, void *fh, void *arg) >> +{ >> + struct v4l2_delete_buffers *delete = arg; >> + int ret = check_fmt(file, delete->type); >> + >> + return ret ? ret : ops->vidioc_delete_bufs(file, fh, delete); >> +} >> + >> static int v4l_g_parm(const struct v4l2_ioctl_ops *ops, >> struct file *file, void *fh, void *arg) >> { >> @@ -2909,6 +2925,7 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = { >> IOCTL_INFO(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0), >> IOCTL_INFO(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)), >> IOCTL_INFO(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)), >> + IOCTL_INFO(VIDIOC_DELETE_BUFS, v4l_delete_bufs, v4l_print_delete_buffers, INFO_FL_QUEUE), > You can add INFO_FL_CLEAR here to automatically zero the reserved field. It also needs INFO_FL_PRIO. > >> }; >> #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) >> >> diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h >> index edb733f21604..55afbde54211 100644 >> --- a/include/media/v4l2-ioctl.h >> +++ b/include/media/v4l2-ioctl.h >> @@ -163,6 +163,8 @@ struct v4l2_fh; >> * :ref:`VIDIOC_CREATE_BUFS <vidioc_create_bufs>` ioctl >> * @vidioc_prepare_buf: pointer to the function that implements >> * :ref:`VIDIOC_PREPARE_BUF <vidioc_prepare_buf>` ioctl >> + * @vidioc_delete_bufs: pointer to the function that implements >> + * :ref:`VIDIOC_DELETE_BUFS <vidioc_delete_bufs>` ioctl >> * @vidioc_overlay: pointer to the function that implements >> * :ref:`VIDIOC_OVERLAY <vidioc_overlay>` ioctl >> * @vidioc_g_fbuf: pointer to the function that implements >> @@ -422,6 +424,8 @@ struct v4l2_ioctl_ops { >> struct v4l2_create_buffers *b); >> int (*vidioc_prepare_buf)(struct file *file, void *fh, >> struct v4l2_buffer *b); >> + int (*vidioc_delete_bufs)(struct file *file, void *fh, >> + struct v4l2_delete_buffers *d); >> >> int (*vidioc_overlay)(struct file *file, void *fh, unsigned int i); >> int (*vidioc_g_fbuf)(struct file *file, void *fh, >> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h >> index ee9161b9fd64..c9ecc4214982 100644 >> --- a/include/media/videobuf2-core.h >> +++ b/include/media/videobuf2-core.h >> @@ -843,6 +843,15 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, >> */ >> int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb); >> >> +/** >> + * vb2_core_delete_buf() - >> + * @q: pointer to &struct vb2_queue with videobuf2 queue. >> + * @index: id number of the buffer. >> + * >> + * Return: returns zero on success; an error code otherwise. >> + */ >> +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index); >> + >> /** >> * vb2_core_qbuf() - Queue a buffer from userspace >> * >> diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h >> index 5a845887850b..2ef68fdf388f 100644 >> --- a/include/media/videobuf2-v4l2.h >> +++ b/include/media/videobuf2-v4l2.h >> @@ -118,6 +118,17 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); >> */ >> int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, >> struct v4l2_buffer *b); >> +/** >> + * vb2_delete_bufs() - Delete buffers from the queue >> + * >> + * @q: pointer to &struct vb2_queue with videobuf2 queue. >> + * @d: delete parameter, passed from userspace to >> + * &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver >> + * >> + * The return values from this function are intended to be directly returned >> + * from &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver. >> + */ >> +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d); >> >> /** >> * vb2_qbuf() - Queue a buffer from userspace >> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h >> index 78260e5d9985..4807b38e2a6f 100644 >> --- a/include/uapi/linux/videodev2.h >> +++ b/include/uapi/linux/videodev2.h >> @@ -2616,6 +2616,21 @@ struct v4l2_create_buffers { >> __u32 reserved[6]; >> }; >> >> +/** >> + * struct v4l2_delete_buffers - VIDIOC_DELETE_BUFS argument >> + * @index: the first buffer to be deleted >> + * @count: number of buffers to delete >> + * @type: enum v4l2_buf_type; buffer type (type == *_MPLANE for >> + * multiplanar buffers); > I would drop the bit between (). That seems overkill to me. > >> + * @reserved: futur extensions > futur -> future > >> + */ >> +struct v4l2_delete_buffers { >> + __u32 index; >> + __u32 count; >> + __u32 type; >> + __u32 reserved[13]; >> +}; >> + >> /* >> * I O C T L C O D E S F O R V I D E O D E V I C E S >> * >> @@ -2715,6 +2730,8 @@ struct v4l2_create_buffers { >> #define VIDIOC_DBG_G_CHIP_INFO _IOWR('V', 102, struct v4l2_dbg_chip_info) >> >> #define VIDIOC_QUERY_EXT_CTRL _IOWR('V', 103, struct v4l2_query_ext_ctrl) >> +#define VIDIOC_DELETE_BUFS _IOWR('V', 104, struct v4l2_delete_buffers) >> + >> >> /* Reminder: when adding new ioctls please add support for them to >> drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */ > Regards, > > Hans >
diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst index 15ff0bf7bbe6..3fd567695477 100644 --- a/Documentation/userspace-api/media/v4l/user-func.rst +++ b/Documentation/userspace-api/media/v4l/user-func.rst @@ -17,6 +17,7 @@ Function Reference vidioc-dbg-g-chip-info vidioc-dbg-g-register vidioc-decoder-cmd + vidioc-delete-bufs vidioc-dqevent vidioc-dv-timings-cap vidioc-encoder-cmd diff --git a/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst new file mode 100644 index 000000000000..a55fe6331fc8 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst @@ -0,0 +1,73 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L + +.. _VIDIOC_DELETE_BUFS: + +************************ +ioctl VIDIOC_DELETE_BUFS +************************ + +Name +==== + +VIDIOC_DELETE_BUFS - Deletes buffers from a queue + +Synopsis +======== + +.. c:macro:: VIDIOC_DELETE_BUFs + +``int ioctl(int fd, VIDIOC_DELETE_BUFs, struct v4l2_delete_buffers *argp)`` + +Arguments +========= + +``fd`` + File descriptor returned by :c:func:`open()`. + +``argp`` + Pointer to struct :c:type:`v4l2_delete_buffers`. + +Description +=========== + +Applications can optionally call the :ref:`VIDIOC_DELETE_BUFS` ioctl to +delete buffers from a queue. + +.. c:type:: v4l2_delete_buffers + +.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}| + +.. flat-table:: struct v4l2_delete_buffers + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 2 + + * - __u32 + - ``index`` + - The starting buffer index to delete. + * - __u32 + - ``count`` + - The number of buffers to be deleted. + * - __u32 + - ``type`` + - Type of the stream or buffers, this is the same as the struct + :c:type:`v4l2_format` ``type`` field. See + :c:type:`v4l2_buf_type` for valid values. + * - __u32 + - ``reserved``\ [13] + - A place holder for future extensions. Drivers and applications + must set the array to zero. + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +EBUSY + File I/O is in progress. + +EINVAL + The buffer ``index`` doesn't exist in the queue. diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 70e36389b704..3d915b4c33b2 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -1634,6 +1634,40 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb) } EXPORT_SYMBOL_GPL(vb2_core_prepare_buf); +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index) +{ + struct vb2_buffer *vb; + + vb = vb2_get_buffer(q, index); + if (!vb) { + dprintk(q, 1, "invalid buffer index %d\n", index); + return -EINVAL; + } + + if (vb->state != VB2_BUF_STATE_DEQUEUED) { + dprintk(q, 1, "can't delete non dequeued buffer index %d\n", index); + return -EINVAL; + } + + if (vb->planes[0].mem_priv) + call_void_vb_qop(vb, buf_cleanup, vb); + + /* Free MMAP buffers or release USERPTR buffers */ + if (q->memory == VB2_MEMORY_MMAP) + __vb2_buf_mem_free(vb); + else if (q->memory == VB2_MEMORY_DMABUF) + __vb2_buf_dmabuf_put(vb); + else + __vb2_buf_userptr_put(vb); + + vb2_queue_remove_buffer(q, vb); + kfree(vb); + + dprintk(q, 2, "buffer %d deleted\n", index); + return 0; +} +EXPORT_SYMBOL_GPL(vb2_core_delete_buf); + /* * vb2_start_streaming() - Attempt to start streaming. * @q: videobuf2 queue diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 724135d41f7f..ffe6b66a27f1 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -751,6 +751,22 @@ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, } EXPORT_SYMBOL_GPL(vb2_prepare_buf); +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d) +{ + unsigned int index; + int ret = 0; + + for (index = d->index; index < d->index + d->count; index++) { + ret = vb2_core_delete_buf(q, index); + if (ret) + break; + } + + d->index = index; + return ret; +} +EXPORT_SYMBOL_GPL(vb2_delete_bufs); + int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) { unsigned requested_planes = 1; diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index f81279492682..215654fd6581 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -720,6 +720,7 @@ static void determine_valid_ioctls(struct video_device *vdev) SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); + SET_VALID_IOCTL(ops, VIDIOC_DELETE_BUFS, vidioc_delete_bufs); } if (is_vid || is_vbi || is_meta) { diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index f4d9d6279094..32336b9bb7e4 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -489,6 +489,13 @@ static void v4l_print_create_buffers(const void *arg, bool write_only) v4l_print_format(&p->format, write_only); } +static void v4l_print_delete_buffers(const void *arg, bool write_only) +{ + const struct v4l2_delete_buffers *p = arg; + + pr_cont("index=%d, count=%d\n", p->index, p->count); +} + static void v4l_print_streamparm(const void *arg, bool write_only) { const struct v4l2_streamparm *p = arg; @@ -2160,6 +2167,15 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops, return ret ? ret : ops->vidioc_prepare_buf(file, fh, b); } +static int v4l_delete_bufs(const struct v4l2_ioctl_ops *ops, + struct file *file, void *fh, void *arg) +{ + struct v4l2_delete_buffers *delete = arg; + int ret = check_fmt(file, delete->type); + + return ret ? ret : ops->vidioc_delete_bufs(file, fh, delete); +} + static int v4l_g_parm(const struct v4l2_ioctl_ops *ops, struct file *file, void *fh, void *arg) { @@ -2909,6 +2925,7 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = { IOCTL_INFO(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0), IOCTL_INFO(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)), IOCTL_INFO(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)), + IOCTL_INFO(VIDIOC_DELETE_BUFS, v4l_delete_bufs, v4l_print_delete_buffers, INFO_FL_QUEUE), }; #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h index edb733f21604..55afbde54211 100644 --- a/include/media/v4l2-ioctl.h +++ b/include/media/v4l2-ioctl.h @@ -163,6 +163,8 @@ struct v4l2_fh; * :ref:`VIDIOC_CREATE_BUFS <vidioc_create_bufs>` ioctl * @vidioc_prepare_buf: pointer to the function that implements * :ref:`VIDIOC_PREPARE_BUF <vidioc_prepare_buf>` ioctl + * @vidioc_delete_bufs: pointer to the function that implements + * :ref:`VIDIOC_DELETE_BUFS <vidioc_delete_bufs>` ioctl * @vidioc_overlay: pointer to the function that implements * :ref:`VIDIOC_OVERLAY <vidioc_overlay>` ioctl * @vidioc_g_fbuf: pointer to the function that implements @@ -422,6 +424,8 @@ struct v4l2_ioctl_ops { struct v4l2_create_buffers *b); int (*vidioc_prepare_buf)(struct file *file, void *fh, struct v4l2_buffer *b); + int (*vidioc_delete_bufs)(struct file *file, void *fh, + struct v4l2_delete_buffers *d); int (*vidioc_overlay)(struct file *file, void *fh, unsigned int i); int (*vidioc_g_fbuf)(struct file *file, void *fh, diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index ee9161b9fd64..c9ecc4214982 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -843,6 +843,15 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, */ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb); +/** + * vb2_core_delete_buf() - + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * @index: id number of the buffer. + * + * Return: returns zero on success; an error code otherwise. + */ +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index); + /** * vb2_core_qbuf() - Queue a buffer from userspace * diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h index 5a845887850b..2ef68fdf388f 100644 --- a/include/media/videobuf2-v4l2.h +++ b/include/media/videobuf2-v4l2.h @@ -118,6 +118,17 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); */ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, struct v4l2_buffer *b); +/** + * vb2_delete_bufs() - Delete buffers from the queue + * + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * @d: delete parameter, passed from userspace to + * &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver + * + * The return values from this function are intended to be directly returned + * from &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver. + */ +int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d); /** * vb2_qbuf() - Queue a buffer from userspace diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 78260e5d9985..4807b38e2a6f 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -2616,6 +2616,21 @@ struct v4l2_create_buffers { __u32 reserved[6]; }; +/** + * struct v4l2_delete_buffers - VIDIOC_DELETE_BUFS argument + * @index: the first buffer to be deleted + * @count: number of buffers to delete + * @type: enum v4l2_buf_type; buffer type (type == *_MPLANE for + * multiplanar buffers); + * @reserved: futur extensions + */ +struct v4l2_delete_buffers { + __u32 index; + __u32 count; + __u32 type; + __u32 reserved[13]; +}; + /* * I O C T L C O D E S F O R V I D E O D E V I C E S * @@ -2715,6 +2730,8 @@ struct v4l2_create_buffers { #define VIDIOC_DBG_G_CHIP_INFO _IOWR('V', 102, struct v4l2_dbg_chip_info) #define VIDIOC_QUERY_EXT_CTRL _IOWR('V', 103, struct v4l2_query_ext_ctrl) +#define VIDIOC_DELETE_BUFS _IOWR('V', 104, struct v4l2_delete_buffers) + /* Reminder: when adding new ioctls please add support for them to drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */
VIDIOC_DELETE_BUFS ioctl allows to delete buffers from a queue. The number of buffers to delete in given by count field of struct v4l2_delete_buffers and the range start at the index specified in the same structure. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com> --- .../userspace-api/media/v4l/user-func.rst | 1 + .../media/v4l/vidioc-delete-bufs.rst | 73 +++++++++++++++++++ .../media/common/videobuf2/videobuf2-core.c | 34 +++++++++ .../media/common/videobuf2/videobuf2-v4l2.c | 16 ++++ drivers/media/v4l2-core/v4l2-dev.c | 1 + drivers/media/v4l2-core/v4l2-ioctl.c | 17 +++++ include/media/v4l2-ioctl.h | 4 + include/media/videobuf2-core.h | 9 +++ include/media/videobuf2-v4l2.h | 11 +++ include/uapi/linux/videodev2.h | 17 +++++ 10 files changed, 183 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst