[PATCH v4 0/7] media: uvcvideo: Invert granular PM logic + PM fix

[PATCH v4 0/7] media: uvcvideo: Invert granular PM logic + PM fix

[Ricardo Ribalda]

It makes more sense to have a list of the ioctls that need power than
the other way around. This patchset takes care of this.

It also fixes one error in the PM logic introduced in a recent patchset.

To support CI I have included patches that are in uvc/for-next but not
in media-committer:
media: uvcvideo: Remove stream->is_streaming field
media: uvcvideo: Split uvc_stop_streaming()
media: uvcvideo: Handle locks in uvc_queue_return_buffers
media: uvcvideo: Use vb2 ioctl and fop helpers
Do not review them again.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
Changes in v4:
- CTRL_MAP DO need the device powered. Thanks Laurent
- CodeStyle
- use EXPORT_SYMBOL_GPL
- Link to v3: https://lore.kernel.org/r/20250630-uvc-grannular-invert-v3-0-abd5cb5c45b7@chromium.org

Changes in v3:
- Rebase
- Merge Invert PM patch with add support for compat ioctls
- Export different core function
- Inline the pm_ioctl patch
- Fix typo in comment
- Link to v2: https://lore.kernel.org/r/20250602-uvc-grannular-invert-v2-0-c871934ad880@chromium.org

Changes in v2. Thanks HdG:
- Rebase fop
- CodeStyle
- Refactor SEND_INITIAL to avoid lis_del()
- Squash "invert PM logic" and "unless is needed"
- Link to v1: https://lore.kernel.org/r/20250528-uvc-grannular-invert-v1-0-d01581f9cc25@chromium.org

---
Hans Verkuil (1):
      media: uvcvideo: Use vb2 ioctl and fop helpers

Ricardo Ribalda (6):
      media: uvcvideo: Handle locks in uvc_queue_return_buffers
      media: uvcvideo: Split uvc_stop_streaming()
      media: uvcvideo: Remove stream->is_streaming field
      media: uvcvideo: Turn on the camera if V4L2_EVENT_SUB_FL_SEND_INITIAL
      media: core: export v4l2_translate_cmd
      media: uvcvideo: uvc_v4l2_unlocked_ioctl: Invert PM logic

 drivers/media/usb/uvc/uvc_ctrl.c     |  10 +-
 drivers/media/usb/uvc/uvc_driver.c   |  37 +---
 drivers/media/usb/uvc/uvc_metadata.c |   8 +-
 drivers/media/usb/uvc/uvc_queue.c    | 199 +++++---------------
 drivers/media/usb/uvc/uvc_v4l2.c     | 345 +++++------------------------------
 drivers/media/usb/uvc/uvcvideo.h     |  37 +---
 drivers/media/v4l2-core/v4l2-ioctl.c |   5 +-
 include/media/v4l2-ioctl.h           |   1 +
 8 files changed, 112 insertions(+), 530 deletions(-)
---
base-commit: 35392e855abf7d02ad3b061cbc75c7c7c37f0577
change-id: 20250528-uvc-grannular-invert-19ad34c59391

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>

[PATCH v4 1/7] media: uvcvideo: Use vb2 ioctl and fop helpers

[Ricardo Ribalda]

From: Hans Verkuil <hans@jjverkuil.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 allows us to drop the 'privileges' scheme, since
that's now handled inside the vb2 helpers.

This makes it possible for uvc to fix the v4l2-compliance streaming tests:
 warn: v4l2-test-formats.cpp(1075): Could not set fmt2

This patch introduces a change on behavior on the uvcdriver to be
aligned with the rest of the subsystem. Now S_INPUT, S_PARM and
S_FORMAT do no grant exclusive ownership of the device.

There are other side effects, some better than others:
- Locking is now more coarse than before, the queue is locked for almost
  every ioctl.
- vidioc_querybuf() can now work when the queue is busy.

Future patches should look into the locking architecture of UVC to
remove one of stream->mutex or queue->mutex.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Hans Verkuil <hans@jjverkuil.nl>
Co-developed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250616-uvc-fop-v4-1-250286570ee7@chromium.org
Signed-off-by: Hans de Goede <hansg@kernel.org>
---
 drivers/media/usb/uvc/uvc_driver.c   |  37 ++---
 drivers/media/usb/uvc/uvc_metadata.c |   8 +-
 drivers/media/usb/uvc/uvc_queue.c    | 143 --------------------
 drivers/media/usb/uvc/uvc_v4l2.c     | 252 +++--------------------------------
 drivers/media/usb/uvc/uvcvideo.h     |  36 +----
 5 files changed, 34 insertions(+), 442 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 62eb45435d8bec5c955720ecb46fb8936871e6cc..accfb4ca3c72cb899185ddc8ecf4e29143d58fc6 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1961,31 +1961,7 @@ static void uvc_unregister_video(struct uvc_device *dev)
 		if (!video_is_registered(&stream->vdev))
 			continue;
 
-		/*
-		 * For stream->vdev we follow the same logic as:
-		 * vb2_video_unregister_device().
-		 */
-
-		/* 1. Take a reference to vdev */
-		get_device(&stream->vdev.dev);
-
-		/* 2. Ensure that no new ioctls can be called. */
-		video_unregister_device(&stream->vdev);
-
-		/* 3. Wait for old ioctls to finish. */
-		mutex_lock(&stream->mutex);
-
-		/* 4. Stop streaming. */
-		uvc_queue_release(&stream->queue);
-
-		mutex_unlock(&stream->mutex);
-
-		put_device(&stream->vdev.dev);
-
-		/*
-		 * For stream->meta.vdev we can directly call:
-		 * vb2_video_unregister_device().
-		 */
+		vb2_video_unregister_device(&stream->vdev);
 		vb2_video_unregister_device(&stream->meta.vdev);
 
 		/*
@@ -2033,6 +2009,8 @@ int uvc_register_video_device(struct uvc_device *dev,
 	vdev->ioctl_ops = ioctl_ops;
 	vdev->release = uvc_release;
 	vdev->prio = &stream->chain->prio;
+	vdev->queue = &queue->queue;
+	vdev->lock = &queue->mutex;
 	if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 		vdev->vfl_dir = VFL_DIR_TX;
 	else
@@ -2397,9 +2375,12 @@ static int __uvc_resume(struct usb_interface *intf, int reset)
 	list_for_each_entry(stream, &dev->streams, list) {
 		if (stream->intf == intf) {
 			ret = uvc_video_resume(stream, reset);
-			if (ret < 0)
-				uvc_queue_streamoff(&stream->queue,
-						    stream->queue.queue.type);
+			if (ret < 0) {
+				mutex_lock(&stream->queue.mutex);
+				vb2_streamoff(&stream->queue.queue,
+					      stream->queue.queue.type);
+				mutex_unlock(&stream->queue.mutex);
+			}
 			return ret;
 		}
 	}
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
index 82de7781f5b6b70c5ba16bcba9e0741231231904..d3aab22f91cea21aefc56409924dfa1451aec914 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->meta.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 2ee142621042167c2587b6a6fdd51c1a46d31c11..72c5494dee9f46ff61072e7d293bfaddda40e615 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -242,153 +242,10 @@ 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)
-{
-	return vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0);
-}
-#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 1abdf1ea39956bbbadd3f166f37bdac518068648..d06ecf3418a988152c6c413568ce32e60040fd87 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -47,8 +47,6 @@ void uvc_pm_put(struct uvc_device *dev)
 	usb_autopm_put_interface(dev->intf);
 }
 
-static int uvc_acquire_privileges(struct uvc_fh *handle);
-
 static int uvc_control_add_xu_mapping(struct uvc_video_chain *chain,
 				      struct uvc_control_mapping *map,
 				      const struct uvc_xu_control_mapping *xmap)
@@ -436,10 +434,6 @@ static int uvc_ioctl_s_fmt(struct file *file, void *fh,
 	const struct uvc_frame *frame;
 	int ret;
 
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
-
 	if (fmt->type != stream->type)
 		return -EINVAL;
 
@@ -448,8 +442,7 @@ static int uvc_ioctl_s_fmt(struct file *file, void *fh,
 		return ret;
 
 	mutex_lock(&stream->mutex);
-
-	if (uvc_queue_allocated(&stream->queue)) {
+	if (vb2_is_busy(&stream->queue.queue)) {
 		ret = -EBUSY;
 		goto done;
 	}
@@ -513,10 +506,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh,
 	unsigned int i;
 	int ret;
 
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
-
 	if (parm->type != stream->type)
 		return -EINVAL;
 
@@ -593,63 +582,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh,
 	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_CREATE_BUFS
- * - 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
  */
@@ -671,7 +603,6 @@ 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;
@@ -686,19 +617,11 @@ static int uvc_v4l2_release(struct file *file)
 
 	uvc_ctrl_cleanup_fh(handle);
 
-	/* Only free resources if this is a privileged handle. */
-	if (uvc_has_privileges(handle))
-		uvc_queue_release(&stream->queue);
-
 	if (handle->is_streaming)
 		uvc_pm_put(stream->dev);
 
 	/* Release the file handle. */
-	uvc_dismiss_privileges(handle);
-	v4l2_fh_del(&handle->vfh);
-	v4l2_fh_exit(&handle->vfh);
-	kfree(handle);
-	file->private_data = NULL;
+	vb2_fop_release(file);
 
 	return 0;
 }
@@ -753,91 +676,6 @@ static int uvc_ioctl_try_fmt(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)
 {
@@ -845,11 +683,6 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
 	struct uvc_streaming *stream = handle->stream;
 	int ret;
 
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	guard(mutex)(&stream->mutex);
-
 	if (handle->is_streaming)
 		return 0;
 
@@ -857,7 +690,7 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
 	if (ret)
 		return ret;
 
-	ret = uvc_queue_streamon(&stream->queue, type);
+	ret = vb2_ioctl_streamon(file, fh, type);
 	if (ret) {
 		uvc_pm_put(stream->dev);
 		return ret;
@@ -873,13 +706,12 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
 {
 	struct uvc_fh *handle = fh;
 	struct uvc_streaming *stream = handle->stream;
+	int ret;
 
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	guard(mutex)(&stream->mutex);
+	ret = vb2_ioctl_streamoff(file, fh, type);
+	if (ret)
+		return ret;
 
-	uvc_queue_streamoff(&stream->queue, type);
 	if (handle->is_streaming) {
 		handle->is_streaming = false;
 		uvc_pm_put(stream->dev);
@@ -962,13 +794,13 @@ 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;
 	u8 *buf;
 	int ret;
 
-	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)) {
@@ -1469,50 +1301,6 @@ static long uvc_v4l2_unlocked_ioctl(struct file *file,
 	return ret;
 }
 
-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,
-		unsigned long flags)
-{
-	struct uvc_fh *handle = file->private_data;
-	struct uvc_streaming *stream = handle->stream;
-
-	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
-	return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
-}
-#endif
-
 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt,
 	.vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt,
@@ -1525,12 +1313,13 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt,
 	.vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt,
 	.vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt,
-	.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_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 = uvc_ioctl_streamon,
 	.vidioc_streamoff = uvc_ioctl_streamoff,
 	.vidioc_enum_input = uvc_ioctl_enum_input,
@@ -1557,11 +1346,10 @@ 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,
+	.get_unmapped_area = vb2_fop_get_unmapped_area,
 #endif
 };
 
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 11d6e3c2ebdfbabd7bbe5722f88ff85f406d9bb6..b300487e6ec9163ac8236803b9e819814233f419 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -328,7 +328,10 @@ struct uvc_buffer {
 
 struct uvc_video_queue {
 	struct vb2_queue queue;
-	struct mutex mutex;			/* Protects queue */
+	struct mutex mutex;			/*
+						 * Serializes vb2_queue and
+						 * fops
+						 */
 
 	unsigned int flags;
 	unsigned int buf_used;
@@ -621,16 +624,10 @@ 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;
 	unsigned int pending_async_ctrls;
 	bool is_streaming;
 };
@@ -689,36 +686,11 @@ 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);
-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);

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 2/7] media: uvcvideo: Handle locks in uvc_queue_return_buffers

[Ricardo Ribalda]

Most of the calls to uvc_queue_return_buffers() wrap the call with
spin_lock_irq()/spin_unlock_irq().

Rename uvc_queue_return_buffers to __uvc_queue_return_buffers to
indicate that this is the version that does not handle locks and create
a new version of the function that handles the lock.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250616-uvc-fop-v4-2-250286570ee7@chromium.org
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Hans de Goede <hansg@kernel.org>
---
 drivers/media/usb/uvc/uvc_queue.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 72c5494dee9f46ff61072e7d293bfaddda40e615..8f9737ac729546683ca48f5e71ce3dfacbae2926 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -42,13 +42,15 @@ static inline struct uvc_buffer *uvc_vbuf_to_buffer(struct vb2_v4l2_buffer *buf)
  *
  * This function must be called with the queue spinlock held.
  */
-static void uvc_queue_return_buffers(struct uvc_video_queue *queue,
-			       enum uvc_buffer_state state)
+static void __uvc_queue_return_buffers(struct uvc_video_queue *queue,
+				       enum uvc_buffer_state state)
 {
 	enum vb2_buffer_state vb2_state = state == UVC_BUF_STATE_ERROR
 					? VB2_BUF_STATE_ERROR
 					: VB2_BUF_STATE_QUEUED;
 
+	lockdep_assert_held(&queue->irqlock);
+
 	while (!list_empty(&queue->irqqueue)) {
 		struct uvc_buffer *buf = list_first_entry(&queue->irqqueue,
 							  struct uvc_buffer,
@@ -59,6 +61,14 @@ static void uvc_queue_return_buffers(struct uvc_video_queue *queue,
 	}
 }
 
+static void uvc_queue_return_buffers(struct uvc_video_queue *queue,
+				     enum uvc_buffer_state state)
+{
+	spin_lock_irq(&queue->irqlock);
+	__uvc_queue_return_buffers(queue, state);
+	spin_unlock_irq(&queue->irqlock);
+}
+
 /* -----------------------------------------------------------------------------
  * videobuf2 queue operations
  */
@@ -171,9 +181,7 @@ static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
 	if (ret == 0)
 		return 0;
 
-	spin_lock_irq(&queue->irqlock);
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
-	spin_unlock_irq(&queue->irqlock);
 
 	return ret;
 }
@@ -187,9 +195,7 @@ static void uvc_stop_streaming(struct vb2_queue *vq)
 	if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
 		uvc_video_stop_streaming(uvc_queue_to_stream(queue));
 
-	spin_lock_irq(&queue->irqlock);
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
-	spin_unlock_irq(&queue->irqlock);
 }
 
 static const struct vb2_ops uvc_queue_qops = {
@@ -263,7 +269,7 @@ void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
 	unsigned long flags;
 
 	spin_lock_irqsave(&queue->irqlock, flags);
-	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
+	__uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
 	/*
 	 * This must be protected by the irqlock spinlock to avoid race
 	 * conditions between uvc_buffer_queue and the disconnection event that

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 3/7] media: uvcvideo: Split uvc_stop_streaming()

[Ricardo Ribalda]

uvc_stop_streaming() is used for meta and video nodes. Split the function
in two to avoid confusion.

Use this opportunity to rename uvc_start_streaming() to
uvc_start_streaming_video(), as it is only called by the video nodes.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250616-uvc-fop-v4-3-250286570ee7@chromium.org
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Hans de Goede <hansg@kernel.org>
---
 drivers/media/usb/uvc/uvc_queue.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 8f9737ac729546683ca48f5e71ce3dfacbae2926..b11f56d62ec0495a8610580367486dfaa31c450d 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -167,7 +167,7 @@ static void uvc_buffer_finish(struct vb2_buffer *vb)
 		uvc_video_clock_update(stream, vbuf, buf);
 }
 
-static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
+static int uvc_start_streaming_video(struct vb2_queue *vq, unsigned int count)
 {
 	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
 	struct uvc_streaming *stream = uvc_queue_to_stream(queue);
@@ -186,14 +186,22 @@ static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return ret;
 }
 
-static void uvc_stop_streaming(struct vb2_queue *vq)
+static void uvc_stop_streaming_video(struct vb2_queue *vq)
 {
 	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
 
 	lockdep_assert_irqs_enabled();
 
-	if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
-		uvc_video_stop_streaming(uvc_queue_to_stream(queue));
+	uvc_video_stop_streaming(uvc_queue_to_stream(queue));
+
+	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
+}
+
+static void uvc_stop_streaming_meta(struct vb2_queue *vq)
+{
+	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+
+	lockdep_assert_irqs_enabled();
 
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
 }
@@ -203,15 +211,20 @@ static const struct vb2_ops uvc_queue_qops = {
 	.buf_prepare = uvc_buffer_prepare,
 	.buf_queue = uvc_buffer_queue,
 	.buf_finish = uvc_buffer_finish,
-	.start_streaming = uvc_start_streaming,
-	.stop_streaming = uvc_stop_streaming,
+	.start_streaming = uvc_start_streaming_video,
+	.stop_streaming = uvc_stop_streaming_video,
 };
 
 static const struct vb2_ops uvc_meta_queue_qops = {
 	.queue_setup = uvc_queue_setup,
 	.buf_prepare = uvc_buffer_prepare,
 	.buf_queue = uvc_buffer_queue,
-	.stop_streaming = uvc_stop_streaming,
+	/*
+	 * .start_streaming is not provided here. Metadata relies on video
+	 * streaming being active. If video isn't streaming, then no metadata
+	 * will arrive either.
+	 */
+	.stop_streaming = uvc_stop_streaming_meta,
 };
 
 int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type)

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 4/7] media: uvcvideo: Remove stream->is_streaming field

[Ricardo Ribalda]

The is_streaming field is used by modular PM to know if the device is
currently streaming or not.

With the transition to vb2 and fop helpers, we can use vb2 functions for
the same functionality. The great benefit is that vb2 already tracks the
streaming state for us.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250616-uvc-fop-v4-4-250286570ee7@chromium.org
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Hans de Goede <hansg@kernel.org>
---
 drivers/media/usb/uvc/uvc_queue.c |  9 +++++++
 drivers/media/usb/uvc/uvc_v4l2.c  | 51 ++-------------------------------------
 drivers/media/usb/uvc/uvcvideo.h  |  1 -
 3 files changed, 11 insertions(+), 50 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index b11f56d62ec0495a8610580367486dfaa31c450d..790184c9843d211d34fa7d66801631d5a07450bd 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -175,12 +175,18 @@ static int uvc_start_streaming_video(struct vb2_queue *vq, unsigned int count)
 
 	lockdep_assert_irqs_enabled();
 
+	ret = uvc_pm_get(stream->dev);
+	if (ret)
+		return ret;
+
 	queue->buf_used = 0;
 
 	ret = uvc_video_start_streaming(stream);
 	if (ret == 0)
 		return 0;
 
+	uvc_pm_put(stream->dev);
+
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
 
 	return ret;
@@ -189,11 +195,14 @@ static int uvc_start_streaming_video(struct vb2_queue *vq, unsigned int count)
 static void uvc_stop_streaming_video(struct vb2_queue *vq)
 {
 	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+	struct uvc_streaming *stream = uvc_queue_to_stream(queue);
 
 	lockdep_assert_irqs_enabled();
 
 	uvc_video_stop_streaming(uvc_queue_to_stream(queue));
 
+	uvc_pm_put(stream->dev);
+
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
 }
 
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index d06ecf3418a988152c6c413568ce32e60040fd87..7ab1bdcfb493fe9f47dbdc86da23cba98d7d10ff 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -617,9 +617,6 @@ static int uvc_v4l2_release(struct file *file)
 
 	uvc_ctrl_cleanup_fh(handle);
 
-	if (handle->is_streaming)
-		uvc_pm_put(stream->dev);
-
 	/* Release the file handle. */
 	vb2_fop_release(file);
 
@@ -676,50 +673,6 @@ static int uvc_ioctl_try_fmt(struct file *file, void *fh,
 	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 }
 
-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 (handle->is_streaming)
-		return 0;
-
-	ret = uvc_pm_get(stream->dev);
-	if (ret)
-		return ret;
-
-	ret = vb2_ioctl_streamon(file, fh, type);
-	if (ret) {
-		uvc_pm_put(stream->dev);
-		return ret;
-	}
-
-	handle->is_streaming = true;
-
-	return 0;
-}
-
-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;
-	int ret;
-
-	ret = vb2_ioctl_streamoff(file, fh, type);
-	if (ret)
-		return ret;
-
-	if (handle->is_streaming) {
-		handle->is_streaming = false;
-		uvc_pm_put(stream->dev);
-	}
-
-	return 0;
-}
-
 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 				struct v4l2_input *input)
 {
@@ -1320,8 +1273,8 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_expbuf = vb2_ioctl_expbuf,
 	.vidioc_dqbuf = vb2_ioctl_dqbuf,
 	.vidioc_create_bufs = vb2_ioctl_create_bufs,
-	.vidioc_streamon = uvc_ioctl_streamon,
-	.vidioc_streamoff = uvc_ioctl_streamoff,
+	.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,
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index b300487e6ec9163ac8236803b9e819814233f419..3e6d2d912f3a1cfcf63b2bc8edd3f86f3da305db 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -629,7 +629,6 @@ struct uvc_fh {
 	struct uvc_video_chain *chain;
 	struct uvc_streaming *stream;
 	unsigned int pending_async_ctrls;
-	bool is_streaming;
 };
 
 /* ------------------------------------------------------------------------

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 5/7] media: uvcvideo: Turn on the camera if V4L2_EVENT_SUB_FL_SEND_INITIAL

[Ricardo Ribalda]

If we subscribe to an event with V4L2_EVENT_SUB_FL_SEND_INITIAL, the
driver needs to report back some values that require the camera to be
powered on. But VIDIOC_SUBSCRIBE_EVENT is not part of the ioctls that
turn on the camera.

We could unconditionally turn on the camera during
VIDIOC_SUBSCRIBE_EVENT, but it is more efficient to turn it on only
during V4L2_EVENT_SUB_FL_SEND_INITIAL, which we believe is not a common
usecase.

To avoid a list_del if uvc_pm_get() fails, we move list_add_tail to the
end of the function.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Fixes: d1b618e79548 ("media: uvcvideo: Do not turn on the camera for some ioctls")
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 303b7509ec47964dc1bf0e28127075b4a3867511..efe609d7087752cb2ef516eef0fce12acd13e747 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2072,18 +2072,24 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
 		goto done;
 	}
 
-	list_add_tail(&sev->node, &mapping->ev_subs);
 	if (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL) {
 		struct v4l2_event ev;
 		u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
 		s32 val = 0;
 
+		ret = uvc_pm_get(handle->chain->dev);
+		if (ret)
+			goto done;
+
 		if (uvc_ctrl_mapping_is_compound(mapping) ||
 		    __uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0)
 			changes |= V4L2_EVENT_CTRL_CH_VALUE;
 
 		uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, val,
 				    changes);
+
+		uvc_pm_put(handle->chain->dev);
+
 		/*
 		 * Mark the queue as active, allowing this initial event to be
 		 * accepted.
@@ -2092,6 +2098,8 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
 		v4l2_event_queue_fh(sev->fh, &ev);
 	}
 
+	list_add_tail(&sev->node, &mapping->ev_subs);
+
 done:
 	mutex_unlock(&handle->chain->ctrl_mutex);
 	return ret;

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 6/7] media: core: export v4l2_translate_cmd

[Ricardo Ribalda]

video_translate_cmd() can be useful for drivers to convert between the
VIDIOC_*32 and VIDIOC_ defines. Let's export it.

Now that the function is exported, use this opportunity to rename the
function with the v4l2_ prefix, that is less ambiguous than video_

The VIDIOC_*32 defines are not accessible by the drivers, they live in
v4l2-compat-ioctl32.c.

Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 5 +++--
 include/media/v4l2-ioctl.h           | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 650dc1956f73d2f1943b56c42140c7b8d757259f..d4c147ea52903290c93fad5c2d1be59807d64614 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -3245,7 +3245,7 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
 	return ret;
 }
 
-static unsigned int video_translate_cmd(unsigned int cmd)
+unsigned int v4l2_translate_cmd(unsigned int cmd)
 {
 #if !defined(CONFIG_64BIT) && defined(CONFIG_COMPAT_32BIT_TIME)
 	switch (cmd) {
@@ -3266,6 +3266,7 @@ static unsigned int video_translate_cmd(unsigned int cmd)
 
 	return cmd;
 }
+EXPORT_SYMBOL_GPL(v4l2_translate_cmd);
 
 static int video_get_user(void __user *arg, void *parg,
 			  unsigned int real_cmd, unsigned int cmd,
@@ -3426,7 +3427,7 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
 	size_t  array_size = 0;
 	void __user *user_ptr = NULL;
 	void	**kernel_ptr = NULL;
-	unsigned int cmd = video_translate_cmd(orig_cmd);
+	unsigned int cmd = v4l2_translate_cmd(orig_cmd);
 	const size_t ioc_size = _IOC_SIZE(cmd);
 
 	/*  Copy arguments into temp kernel buffer  */
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index c6ec87e88dfef9e6cfe1d1fb587c1600882fb14d..82695c3a300a73219f262fb556ed61a8f09d273e 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -679,6 +679,7 @@ long int v4l2_compat_ioctl32(struct file *file, unsigned int cmd,
 #endif
 
 unsigned int v4l2_compat_translate_cmd(unsigned int cmd);
+unsigned int v4l2_translate_cmd(unsigned int cmd);
 int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd);
 int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd);
 int v4l2_compat_get_array_args(struct file *file, void *mbuf,

-- 
2.50.0.727.gbf7dc18ff4-goog

[PATCH v4 7/7] media: uvcvideo: uvc_v4l2_unlocked_ioctl: Invert PM logic

[Ricardo Ribalda]

Instead of listing the IOCTLs that do not need to turn on the camera,
list the IOCTLs that need to turn it on. This makes the code more
maintainable.

This patch changes the behaviour for unsupported IOCTLs. Those IOCTLs
will not turn on the camera.

Suggested-by: Hans Verkuil <hans@jjverkuil.nl>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Hans Verkuil <hans@hverkuil.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 52 ++++++++++++++++++++--------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 7ab1bdcfb493fe9f47dbdc86da23cba98d7d10ff..160f9cf6e6dbdbf39e3eff56a5d5ea1d977fbe22 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1222,36 +1222,36 @@ static long uvc_v4l2_unlocked_ioctl(struct file *file,
 				    unsigned int cmd, unsigned long arg)
 {
 	struct uvc_fh *handle = file->private_data;
+	unsigned int converted_cmd = v4l2_translate_cmd(cmd);
 	int ret;
 
-	/* The following IOCTLs do not need to turn on the camera. */
-	switch (cmd) {
-	case VIDIOC_CREATE_BUFS:
-	case VIDIOC_DQBUF:
-	case VIDIOC_ENUM_FMT:
-	case VIDIOC_ENUM_FRAMEINTERVALS:
-	case VIDIOC_ENUM_FRAMESIZES:
-	case VIDIOC_ENUMINPUT:
-	case VIDIOC_EXPBUF:
-	case VIDIOC_G_FMT:
-	case VIDIOC_G_PARM:
-	case VIDIOC_G_SELECTION:
-	case VIDIOC_QBUF:
-	case VIDIOC_QUERYCAP:
-	case VIDIOC_REQBUFS:
-	case VIDIOC_SUBSCRIBE_EVENT:
-	case VIDIOC_UNSUBSCRIBE_EVENT:
-		return video_ioctl2(file, cmd, arg);
-	}
-
-	ret = uvc_pm_get(handle->stream->dev);
-	if (ret)
+	/* The following IOCTLs need to turn on the camera. */
+	switch (converted_cmd) {
+	case UVCIOC_CTRL_MAP:
+	case UVCIOC_CTRL_QUERY:
+	case VIDIOC_G_CTRL:
+	case VIDIOC_G_EXT_CTRLS:
+	case VIDIOC_G_INPUT:
+	case VIDIOC_QUERYCTRL:
+	case VIDIOC_QUERYMENU:
+	case VIDIOC_QUERY_EXT_CTRL:
+	case VIDIOC_S_CTRL:
+	case VIDIOC_S_EXT_CTRLS:
+	case VIDIOC_S_FMT:
+	case VIDIOC_S_INPUT:
+	case VIDIOC_S_PARM:
+	case VIDIOC_TRY_EXT_CTRLS:
+	case VIDIOC_TRY_FMT:
+		ret = uvc_pm_get(handle->stream->dev);
+		if (ret)
+			return ret;
+		ret = video_ioctl2(file, cmd, arg);
+		uvc_pm_put(handle->stream->dev);
 		return ret;
+	}
 
-	ret = video_ioctl2(file, cmd, arg);
-
-	uvc_pm_put(handle->stream->dev);
-	return ret;
+	/* The other IOCTLs can run with the camera off. */
+	return video_ioctl2(file, cmd, arg);
 }
 
 const struct v4l2_ioctl_ops uvc_ioctl_ops = {

-- 
2.50.0.727.gbf7dc18ff4-goog

Re: [PATCH v4 0/7] media: uvcvideo: Invert granular PM logic + PM fix

[Hans de Goede]

Hi,

On 1-Jul-25 08:45, Ricardo Ribalda wrote:
> It makes more sense to have a list of the ioctls that need power than
> the other way around. This patchset takes care of this.
> 
> It also fixes one error in the PM logic introduced in a recent patchset.
> 
> To support CI I have included patches that are in uvc/for-next but not
> in media-committer:
> media: uvcvideo: Remove stream->is_streaming field
> media: uvcvideo: Split uvc_stop_streaming()
> media: uvcvideo: Handle locks in uvc_queue_return_buffers
> media: uvcvideo: Use vb2 ioctl and fop helpers
> Do not review them again.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

Thank you for the new version.

I've pushed patches 5-7 to uvc/for-next now (1-4 are
already there).

I plan to send a pull-request with these changes this Thursday.

Regards,

Hans


> ---
> Changes in v4:
> - CTRL_MAP DO need the device powered. Thanks Laurent
> - CodeStyle
> - use EXPORT_SYMBOL_GPL
> - Link to v3: https://lore.kernel.org/r/20250630-uvc-grannular-invert-v3-0-abd5cb5c45b7@chromium.org
> 
> Changes in v3:
> - Rebase
> - Merge Invert PM patch with add support for compat ioctls
> - Export different core function
> - Inline the pm_ioctl patch
> - Fix typo in comment
> - Link to v2: https://lore.kernel.org/r/20250602-uvc-grannular-invert-v2-0-c871934ad880@chromium.org
> 
> Changes in v2. Thanks HdG:
> - Rebase fop
> - CodeStyle
> - Refactor SEND_INITIAL to avoid lis_del()
> - Squash "invert PM logic" and "unless is needed"
> - Link to v1: https://lore.kernel.org/r/20250528-uvc-grannular-invert-v1-0-d01581f9cc25@chromium.org
> 
> ---
> Hans Verkuil (1):
>       media: uvcvideo: Use vb2 ioctl and fop helpers
> 
> Ricardo Ribalda (6):
>       media: uvcvideo: Handle locks in uvc_queue_return_buffers
>       media: uvcvideo: Split uvc_stop_streaming()
>       media: uvcvideo: Remove stream->is_streaming field
>       media: uvcvideo: Turn on the camera if V4L2_EVENT_SUB_FL_SEND_INITIAL
>       media: core: export v4l2_translate_cmd
>       media: uvcvideo: uvc_v4l2_unlocked_ioctl: Invert PM logic
> 
>  drivers/media/usb/uvc/uvc_ctrl.c     |  10 +-
>  drivers/media/usb/uvc/uvc_driver.c   |  37 +---
>  drivers/media/usb/uvc/uvc_metadata.c |   8 +-
>  drivers/media/usb/uvc/uvc_queue.c    | 199 +++++---------------
>  drivers/media/usb/uvc/uvc_v4l2.c     | 345 +++++------------------------------
>  drivers/media/usb/uvc/uvcvideo.h     |  37 +---
>  drivers/media/v4l2-core/v4l2-ioctl.c |   5 +-
>  include/media/v4l2-ioctl.h           |   1 +
>  8 files changed, 112 insertions(+), 530 deletions(-)
> ---
> base-commit: 35392e855abf7d02ad3b061cbc75c7c7c37f0577
> change-id: 20250528-uvc-grannular-invert-19ad34c59391
> 
> Best regards,