+
+ if (start > q->max_num_buffers - count)
+ return -EINVAL;
+
+ mutex_lock(&q->mmap_lock);
+
+ /* Check that all buffers in the range exist */
+ for (i = start; i < start + count; i++) {
+ struct vb2_buffer *vb = vb2_get_buffer(q, i);
+
+ if (!vb) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+ if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+ }
+ __vb2_queue_free(q, start, count);
+ dprintk(q, 2, "%u buffers removed\n", count);
+
+unlock:
+ mutex_unlock(&q->mmap_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vb2_core_remove_bufs);
+
/*
* 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 03e8080a68a8..293f3d5f1c4e 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -685,7 +685,7 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory,
*flags &= V4L2_MEMORY_FLAG_NON_COHERENT;
}
- *caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS;
+ *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS;
if (q->io_modes & VB2_MMAP)
*caps |= V4L2_BUF_CAP_SUPPORTS_MMAP;
if (q->io_modes & VB2_USERPTR)
@@ -1001,6 +1001,24 @@ EXPORT_SYMBOL_GPL(vb2_poll);
/* vb2 ioctl helpers */
+int vb2_ioctl_remove_bufs(struct file *file, void *priv,
+ struct v4l2_remove_buffers *d)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vdev->queue->type != d->type)
+ return -EINVAL;
+
+ if (d->count == 0)
+ return 0;
+
+ if (vb2_queue_is_busy(vdev->queue, file))
+ return -EBUSY;
+
+ return vb2_core_remove_bufs(vdev->queue, d->index, d->count);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_remove_bufs);
+
int vb2_ioctl_reqbufs(struct file *file, void *priv,
struct v4l2_requestbuffers *p)
{
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index d13954bd31fd..e39e9742fdb5 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -722,6 +722,9 @@ 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);
+ /* VIDIOC_CREATE_BUFS support is mandatory to enable VIDIOC_REMOVE_BUFS */
+ if (ops->vidioc_create_bufs)
+ SET_VALID_IOCTL(ops, VIDIOC_REMOVE_BUFS, vidioc_remove_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 6e7b8b682d13..5aeff5519407 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -489,6 +489,14 @@ static void v4l_print_create_buffers(const void *arg, bool write_only)
v4l_print_format(&p->format, write_only);
}
+static void v4l_print_remove_buffers(const void *arg, bool write_only)
+{
+ const struct v4l2_remove_buffers *p = arg;
+
+ pr_cont("type=%s, index=%u, count=%u\n",
+ prt_names(p->type, v4l2_type_names), p->index, p->count);
+}
+
static void v4l_print_streamparm(const void *arg, bool write_only)
{
const struct v4l2_streamparm *p = arg;
@@ -2092,6 +2100,7 @@ static int v4l_overlay(const struct v4l2_ioctl_ops *ops,
static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
+ struct video_device *vfd = video_devdata(file);
struct v4l2_requestbuffers *p = arg;
int ret = check_fmt(file, p->type);
@@ -2100,6 +2109,10 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
memset_after(p, 0, flags);
+ p->capabilities = 0;
+ if (is_valid_ioctl(vfd, VIDIOC_REMOVE_BUFS))
+ p->capabilities = V4L2_BUF_CAP_SUPPORTS_REMOVE_BUFS;
+
return ops->vidioc_reqbufs(file, fh, p);
}
@@ -2133,6 +2146,7 @@ static int v4l_dqbuf(const struct v4l2_ioctl_ops *ops,
static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
+ struct video_device *vfd = video_devdata(file);
struct v4l2_create_buffers *create = arg;
int ret = check_fmt(file, create->format.type);
@@ -2143,6 +2157,10 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
v4l_sanitize_format(&create->format);
+ create->capabilities = 0;
+ if (is_valid_ioctl(vfd, VIDIOC_REMOVE_BUFS))
+ create->capabilities = V4L2_BUF_CAP_SUPPORTS_REMOVE_BUFS;
+
ret = ops->vidioc_create_bufs(file, fh, create);
if (create->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
@@ -2161,6 +2179,17 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
}
+static int v4l_remove_bufs(const struct v4l2_ioctl_ops *ops,
+ struct file *file, void *fh, void *arg)
+{
+ struct v4l2_remove_buffers *remove = arg;
+
+ if (ops->vidioc_remove_bufs)
+ return ops->vidioc_remove_bufs(file, fh, remove);
+
+ return -ENOTTY;
+}
+
static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
@@ -2910,6 +2939,7 @@ 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_REMOVE_BUFS, v4l_remove_bufs, v4l_print_remove_buffers, INFO_FL_PRIO | INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_remove_buffers, type)),
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index edb733f21604..bdbb7e542321 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_remove_bufs: pointer to the function that implements
+ * :ref:`VIDIOC_REMOVE_BUFS <vidioc_remove_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_remove_bufs)(struct file *file, void *fh,
+ struct v4l2_remove_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 b9333e2c7797..955237ac503d 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -870,6 +870,16 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
*/
int vb2_core_prepare_buf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb);
+/**
+ * vb2_core_remove_bufs() -
+ * @q: pointer to &struct vb2_queue with videobuf2 queue.
+ * @start: first index of the range of buffers to remove.
+ * @count: number of buffers to remove.
+ *
+ * Return: returns zero on success; an error code otherwise.
+ */
+int vb2_core_remove_bufs(struct vb2_queue *q, unsigned int start, unsigned int count);
+
/**
* vb2_core_qbuf() - Queue a buffer from userspace
*
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index 5a845887850b..77ce8238ab30 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -334,6 +334,8 @@ int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
int vb2_ioctl_expbuf(struct file *file, void *priv,
struct v4l2_exportbuffer *p);
+int vb2_ioctl_remove_bufs(struct file *file, void *priv,
+ struct v4l2_remove_buffers *p);
/* struct v4l2_file_operations helpers */
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index a8015e5e7fa4..2663213b76a4 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1036,6 +1036,7 @@ struct v4l2_requestbuffers {
#define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5)
#define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS (1 << 6)
#define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS (1 << 7)
+#define V4L2_BUF_CAP_SUPPORTS_REMOVE_BUFS (1 << 8)
/**
* struct v4l2_plane - plane info for multi-planar buffers
@@ -2624,6 +2625,20 @@ struct v4l2_create_buffers {
__u32 reserved[5];
};
+/**
+ * struct v4l2_remove_buffers - VIDIOC_REMOVE_BUFS argument
+ * @index: the first buffer to be removed
+ * @count: number of buffers to removed
+ * @type: enum v4l2_buf_type
+ * @reserved: future extensions
+ */
+struct v4l2_remove_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
*
@@ -2723,6 +2738,8 @@ 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_REMOVE_BUFS _IOWR('V', 104, struct v4l2_remove_buffers)
+
/* Reminder: when adding new ioctls please add support for them to
drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */
