From: Hans Verkuil <hverk...@xs4all.nl>
When uvc was written the vb2 ioctl and file operation helpers didn't exist.
This patch switches uvc over to those helpers, which removes a lot of
boilerplate
code and simplifies VIDIOC_G/S_PRIORITY handling and allows us to drop the
'privileges' scheme, since that's now handled inside the vb2 helpers.
This makes it possible for uvc to pass the v4l2-compliance streaming tests.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
---
drivers/media/usb/uvc/uvc_driver.c | 7 +-
drivers/media/usb/uvc/uvc_metadata.c | 8 +-
drivers/media/usb/uvc/uvc_queue.c | 131 -------------
drivers/media/usb/uvc/uvc_v4l2.c | 272 ++-------------------------
drivers/media/usb/uvc/uvcvideo.h | 28 ---
5 files changed, 24 insertions(+), 422 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_driver.c
b/drivers/media/usb/uvc/uvc_driver.c
index 6c928e708615..b9f3984e9f80 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1911,7 +1911,6 @@ static struct uvc_video_chain *uvc_alloc_chain(struct
uvc_device *dev)
INIT_LIST_HEAD(&chain->entities);
mutex_init(&chain->ctrl_mutex);
chain->dev = dev;
- v4l2_prio_init(&chain->prio);
return chain;
}
@@ -2194,7 +2193,7 @@ int uvc_register_video_device(struct uvc_device *dev,
vdev->fops = fops;
vdev->ioctl_ops = ioctl_ops;
vdev->release = uvc_release;
- vdev->prio = &stream->chain->prio;
+ vdev->queue = &queue->queue;
if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
vdev->vfl_dir = VFL_DIR_TX;
else
@@ -2560,8 +2559,8 @@ static int __uvc_resume(struct usb_interface *intf, int
reset)
if (stream->intf == intf) {
ret = uvc_video_resume(stream, reset);
if (ret < 0)
- uvc_queue_streamoff(&stream->queue,
- stream->queue.queue.type);
+ vb2_streamoff(&stream->queue.queue,
+ stream->queue.queue.type);
return ret;
}
}
diff --git a/drivers/media/usb/uvc/uvc_metadata.c
b/drivers/media/usb/uvc/uvc_metadata.c
index b6279ad7ac84..2f52cdc62929 100644
--- a/drivers/media/usb/uvc/uvc_metadata.c
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -96,7 +96,7 @@ static int uvc_meta_v4l2_set_format(struct file *file, void
*fh,
*/
mutex_lock(&stream->mutex);
- if (uvc_queue_allocated(&stream->queue))
+ if (vb2_is_busy(&stream->queue.queue))
ret = -EBUSY;
else
stream->meta.format = fmt->dataformat;
@@ -164,12 +164,6 @@ int uvc_meta_register(struct uvc_streaming *stream)
stream->meta.format = V4L2_META_FMT_UVC;
- /*
- * The video interface queue uses manual locking and thus does not set
- * the queue pointer. Set it manually here.
- */
- vdev->queue = &queue->queue;
-
return uvc_register_video_device(dev, stream, vdev, queue,
V4L2_BUF_TYPE_META_CAPTURE,
&uvc_meta_fops, &uvc_meta_ioctl_ops);
diff --git a/drivers/media/usb/uvc/uvc_queue.c
b/drivers/media/usb/uvc/uvc_queue.c
index 21a907d32bb7..fba9646c8ba5 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -247,115 +247,10 @@ int uvc_queue_init(struct uvc_video_queue *queue, enum
v4l2_buf_type type,
return 0;
}
-void uvc_queue_release(struct uvc_video_queue *queue)
-{
- mutex_lock(&queue->mutex);
- vb2_queue_release(&queue->queue);
- mutex_unlock(&queue->mutex);
-}
-
/*
-----------------------------------------------------------------------------
* V4L2 queue operations
*/
-int uvc_request_buffers(struct uvc_video_queue *queue,
- struct v4l2_requestbuffers *rb)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_reqbufs(&queue->queue, rb);
- mutex_unlock(&queue->mutex);
-
- return ret ? ret : rb->count;
-}
-
-int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_querybuf(&queue->queue, buf);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_create_buffers(struct uvc_video_queue *queue,
- struct v4l2_create_buffers *cb)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_create_bufs(&queue->queue, cb);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_queue_buffer(struct uvc_video_queue *queue,
- struct media_device *mdev, struct v4l2_buffer *buf)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_qbuf(&queue->queue, mdev, buf);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_export_buffer(struct uvc_video_queue *queue,
- struct v4l2_exportbuffer *exp)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_expbuf(&queue->queue, exp);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
- int nonblocking)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_dqbuf(&queue->queue, buf, nonblocking);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_streamon(&queue->queue, type);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type)
-{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_streamoff(&queue->queue, type);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
-int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
-{
- return vb2_mmap(&queue->queue, vma);
-}
-
#ifndef CONFIG_MMU
unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
unsigned long pgoff)
@@ -364,36 +259,10 @@ unsigned long uvc_queue_get_unmapped_area(struct
uvc_video_queue *queue,
}
#endif
-__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
- poll_table *wait)
-{
- __poll_t ret;
-
- mutex_lock(&queue->mutex);
- ret = vb2_poll(&queue->queue, file, wait);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
-
/*
-----------------------------------------------------------------------------
*
*/
-/*
- * Check if buffers have been allocated.
- */
-int uvc_queue_allocated(struct uvc_video_queue *queue)
-{
- int allocated;
-
- mutex_lock(&queue->mutex);
- allocated = vb2_is_busy(&queue->queue);
- mutex_unlock(&queue->mutex);
-
- return allocated;
-}
-
/*
* Cancel the video buffers queue.
*
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 36eb48622d48..5a4b192ddecf 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -346,17 +346,13 @@ static int uvc_v4l2_set_format(struct uvc_streaming
*stream,
return ret;
mutex_lock(&stream->mutex);
-
- if (uvc_queue_allocated(&stream->queue)) {
+ if (vb2_is_busy(&stream->queue.queue)) {
ret = -EBUSY;
- goto done;
+ } else {
+ stream->ctrl = probe;
+ stream->cur_format = format;
+ stream->cur_frame = frame;
}
-
- stream->ctrl = probe;
- stream->cur_format = format;
- stream->cur_frame = frame;
-
-done:
mutex_unlock(&stream->mutex);
return ret;
}
@@ -483,62 +479,6 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming
*stream,
return 0;
}
-/* ------------------------------------------------------------------------
- * Privilege management
- */
-
-/*
- * Privilege management is the multiple-open implementation basis. The current
- * implementation is completely transparent for the end-user and doesn't
- * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
- * Those ioctls enable finer control on the device (by making possible for a
- * user to request exclusive access to a device), but are not mature yet.
- * Switching to the V4L2 priority mechanism might be considered in the future
- * if this situation changes.
- *
- * Each open instance of a UVC device can either be in a privileged or
- * unprivileged state. Only a single instance can be in a privileged state at
- * a given time. Trying to perform an operation that requires privileges will
- * automatically acquire the required privileges if possible, or return -EBUSY
- * otherwise. Privileges are dismissed when closing the instance or when
- * freeing the video buffers using VIDIOC_REQBUFS.
- *
- * Operations that require privileges are:
- *
- * - VIDIOC_S_INPUT
- * - VIDIOC_S_PARM
- * - VIDIOC_S_FMT
- * - VIDIOC_REQBUFS
- */
-static int uvc_acquire_privileges(struct uvc_fh *handle)
-{
- /* Always succeed if the handle is already privileged. */
- if (handle->state == UVC_HANDLE_ACTIVE)
- return 0;
-
- /* Check if the device already has a privileged handle. */
- if (atomic_inc_return(&handle->stream->active) != 1) {
- atomic_dec(&handle->stream->active);
- return -EBUSY;
- }
-
- handle->state = UVC_HANDLE_ACTIVE;
- return 0;
-}
-
-static void uvc_dismiss_privileges(struct uvc_fh *handle)
-{
- if (handle->state == UVC_HANDLE_ACTIVE)
- atomic_dec(&handle->stream->active);
-
- handle->state = UVC_HANDLE_PASSIVE;
-}
-
-static int uvc_has_privileges(struct uvc_fh *handle)
-{
- return handle->state == UVC_HANDLE_ACTIVE;
-}
-
/* ------------------------------------------------------------------------
* V4L2 file operations
*/
@@ -581,7 +521,6 @@ static int uvc_v4l2_open(struct file *file)
v4l2_fh_add(&handle->vfh);
handle->chain = stream->chain;
handle->stream = stream;
- handle->state = UVC_HANDLE_PASSIVE;
file->private_data = handle;
return 0;
@@ -594,15 +533,8 @@ static int uvc_v4l2_release(struct file *file)
uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
- /* Only free resources if this is a privileged handle. */
- if (uvc_has_privileges(handle))
- uvc_queue_release(&stream->queue);
-
/* Release the file handle. */
- uvc_dismiss_privileges(handle);
- v4l2_fh_del(&handle->vfh);
- v4l2_fh_exit(&handle->vfh);
- kfree(handle);
+ vb2_fop_release(file);
file->private_data = NULL;
mutex_lock(&stream->dev->lock);
@@ -696,11 +628,6 @@ static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void
*fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
- int ret;
-
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
return uvc_v4l2_set_format(stream, fmt);
}
@@ -710,11 +637,6 @@ static int uvc_ioctl_s_fmt_vid_out(struct file *file, void
*fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
- int ret;
-
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
return uvc_v4l2_set_format(stream, fmt);
}
@@ -739,124 +661,6 @@ static int uvc_ioctl_try_fmt_vid_out(struct file *file,
void *fh,
return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
}
-static int uvc_ioctl_reqbufs(struct file *file, void *fh,
- struct v4l2_requestbuffers *rb)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
- int ret;
-
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
-
- mutex_lock(&stream->mutex);
- ret = uvc_request_buffers(&stream->queue, rb);
- mutex_unlock(&stream->mutex);
- if (ret < 0)
- return ret;
-
- if (ret == 0)
- uvc_dismiss_privileges(handle);
-
- return 0;
-}
-
-static int uvc_ioctl_querybuf(struct file *file, void *fh,
- struct v4l2_buffer *buf)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- return uvc_query_buffer(&stream->queue, buf);
-}
-
-static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- return uvc_queue_buffer(&stream->queue,
- stream->vdev.v4l2_dev->mdev, buf);
-}
-
-static int uvc_ioctl_expbuf(struct file *file, void *fh,
- struct v4l2_exportbuffer *exp)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- return uvc_export_buffer(&stream->queue, exp);
-}
-
-static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer
*buf)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- return uvc_dequeue_buffer(&stream->queue, buf,
- file->f_flags & O_NONBLOCK);
-}
-
-static int uvc_ioctl_create_bufs(struct file *file, void *fh,
- struct v4l2_create_buffers *cb)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
- int ret;
-
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
-
- return uvc_create_buffers(&stream->queue, cb);
-}
-
-static int uvc_ioctl_streamon(struct file *file, void *fh,
- enum v4l2_buf_type type)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
- int ret;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- mutex_lock(&stream->mutex);
- ret = uvc_queue_streamon(&stream->queue, type);
- mutex_unlock(&stream->mutex);
-
- return ret;
-}
-
-static int uvc_ioctl_streamoff(struct file *file, void *fh,
- enum v4l2_buf_type type)
-{
- struct uvc_fh *handle = fh;
- struct uvc_streaming *stream = handle->stream;
-
- if (!uvc_has_privileges(handle))
- return -EBUSY;
-
- mutex_lock(&stream->mutex);
- uvc_queue_streamoff(&stream->queue, type);
- mutex_unlock(&stream->mutex);
-
- return 0;
-}
-
static int uvc_ioctl_enum_input(struct file *file, void *fh,
struct v4l2_input *input)
{
@@ -924,13 +728,12 @@ static int uvc_ioctl_g_input(struct file *file, void *fh,
unsigned int *input)
static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
{
struct uvc_fh *handle = fh;
+ struct uvc_streaming *stream = handle->stream;
struct uvc_video_chain *chain = handle->chain;
- int ret;
u32 i;
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
+ if (vb2_is_busy(&stream->queue.queue))
+ return -EBUSY;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
@@ -1191,11 +994,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
- int ret;
-
- ret = uvc_acquire_privileges(handle);
- if (ret < 0)
- return ret;
return uvc_v4l2_set_streamparm(stream, parm);
}
@@ -1463,36 +1261,6 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
}
#endif
-static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
- size_t count, loff_t *ppos)
-{
- struct uvc_fh *handle = file->private_data;
- struct uvc_streaming *stream = handle->stream;
-
- uvc_dbg(stream->dev, CALLS, "%s: not implemented\n", __func__);
- return -EINVAL;
-}
-
-static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
-{
- struct uvc_fh *handle = file->private_data;
- struct uvc_streaming *stream = handle->stream;
-
- uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
- return uvc_queue_mmap(&stream->queue, vma);
-}
-
-static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
-{
- struct uvc_fh *handle = file->private_data;
- struct uvc_streaming *stream = handle->stream;
-
- uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
- return uvc_queue_poll(&stream->queue, file, wait);
-}
-
#ifndef CONFIG_MMU
static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len, unsigned long pgoff,
@@ -1517,14 +1285,15 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
.vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
.vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
.vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
- .vidioc_reqbufs = uvc_ioctl_reqbufs,
- .vidioc_querybuf = uvc_ioctl_querybuf,
- .vidioc_qbuf = uvc_ioctl_qbuf,
- .vidioc_expbuf = uvc_ioctl_expbuf,
- .vidioc_dqbuf = uvc_ioctl_dqbuf,
- .vidioc_create_bufs = uvc_ioctl_create_bufs,
- .vidioc_streamon = uvc_ioctl_streamon,
- .vidioc_streamoff = uvc_ioctl_streamoff,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
.vidioc_enum_input = uvc_ioctl_enum_input,
.vidioc_g_input = uvc_ioctl_g_input,
.vidioc_s_input = uvc_ioctl_s_input,
@@ -1554,9 +1323,8 @@ const struct v4l2_file_operations uvc_fops = {
#ifdef CONFIG_COMPAT
.compat_ioctl32 = uvc_v4l2_compat_ioctl32,
#endif
- .read = uvc_v4l2_read,
- .mmap = uvc_v4l2_mmap,
- .poll = uvc_v4l2_poll,
+ .mmap = vb2_fop_mmap,
+ .poll = vb2_fop_poll,
#ifndef CONFIG_MMU
.get_unmapped_area = uvc_v4l2_get_unmapped_area,
#endif
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 1f17e4253673..b478bb6efab5 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -478,7 +478,6 @@ struct uvc_video_chain {
struct mutex ctrl_mutex; /* Protects ctrl.info */
- struct v4l2_prio_state prio; /* V4L2 priority state */
u32 caps; /* V4L2 chain-wide caps */
u8 ctrl_class_bitmap; /* Bitmap of valid classes */
};
@@ -715,16 +714,10 @@ struct uvc_device {
struct uvc_entity *gpio_unit;
};
-enum uvc_handle_state {
- UVC_HANDLE_PASSIVE = 0,
- UVC_HANDLE_ACTIVE = 1,
-};
-
struct uvc_fh {
struct v4l2_fh vfh;
struct uvc_video_chain *chain;
struct uvc_streaming *stream;
- enum uvc_handle_state state;
};
struct uvc_driver {
@@ -789,36 +782,15 @@ struct uvc_entity *uvc_entity_by_id(struct uvc_device
*dev, int id);
/* Video buffers queue management. */
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
int drop_corrupted);
-void uvc_queue_release(struct uvc_video_queue *queue);
-int uvc_request_buffers(struct uvc_video_queue *queue,
- struct v4l2_requestbuffers *rb);
-int uvc_query_buffer(struct uvc_video_queue *queue,
- struct v4l2_buffer *v4l2_buf);
-int uvc_create_buffers(struct uvc_video_queue *queue,
- struct v4l2_create_buffers *v4l2_cb);
-int uvc_queue_buffer(struct uvc_video_queue *queue,
- struct media_device *mdev,
- struct v4l2_buffer *v4l2_buf);
-int uvc_export_buffer(struct uvc_video_queue *queue,
- struct v4l2_exportbuffer *exp);
-int uvc_dequeue_buffer(struct uvc_video_queue *queue,
- struct v4l2_buffer *v4l2_buf, int nonblocking);
-int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type);
-int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type
type);
void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
struct uvc_buffer *buf);
struct uvc_buffer *uvc_queue_get_current_buffer(struct uvc_video_queue *queue);
void uvc_queue_buffer_release(struct uvc_buffer *buf);
-int uvc_queue_mmap(struct uvc_video_queue *queue,
- struct vm_area_struct *vma);
-__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
- poll_table *wait);
#ifndef CONFIG_MMU
unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
unsigned long pgoff);
#endif
-int uvc_queue_allocated(struct uvc_video_queue *queue);
static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
return vb2_is_streaming(&queue->queue);
--
2.31.0.rc2.261.g7f71774620-goog
