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Date:   Tue, 25 Oct 2022 15:45:36 +0300
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Ricardo Ribalda <ribalda@chromium.org>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        linux-kernel@vger.kernel.org, Tomasz Figa <tfiga@chromium.org>,
        linux-media@vger.kernel.org
Subject: Re: [PATCH v1 3/3] media: uvcvideo: Do power management granularly
Message-ID: <Y1facEGMo+N1v0RU@pendragon.ideasonboard.com>
References: <20220920-resend-powersave-v1-0-123aa2ba3836@chromium.org>
 <20220920-resend-powersave-v1-3-123aa2ba3836@chromium.org>
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In-Reply-To: <20220920-resend-powersave-v1-3-123aa2ba3836@chromium.org>
Precedence: bulk

Hi Ricardo,

Thank you for the patch.

On Tue, Sep 20, 2022 at 04:09:52PM +0200, Ricardo Ribalda wrote:
> Instead of suspending/resume the USB device at open()/close(), do it
> when the device is actually used.
> 
> This way we can reduce the power consumption when a service is holding
> the video device and leaving it in an idle state.
> 
> Reviewed-by: Tomasz Figa <tfiga@chromium.org>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 8d5002543e2c..b9642afabd9b 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -25,6 +25,46 @@
>  
>  #include "uvcvideo.h"
>  
> +/* ------------------------------------------------------------------------
> + * UVC power management
> + */
> +
> +static int uvc_pm_get(struct uvc_streaming *stream)
> +{
> +	int ret = 0;

No need to initialize ret to 0.

> +
> +	ret = usb_autopm_get_interface(stream->dev->intf);
> +	if (ret)
> +		return ret;
> +
> +	mutex_lock(&stream->dev->lock);
> +	if (!stream->dev->users)
> +		ret = uvc_status_start(stream->dev, GFP_KERNEL);

For devices that don't have a status endpoint, we will end up calling
uvc_status_start() and uvc_status_stop() around most ioctl calls (all
call sites of uvc_pm_get() and uvc_pm_put() below). uvc_status_start()
and uvc_status_stop() are no-op in that case, but conceptually I don't
think that's very nice. Could we instead keep the status start/stop
calls to open()/release() ?

If you don't mind, I'll give this a try and post a new version of the
patch, that should be faster than going through another review round.

> +	if (!ret)
> +		stream->dev->users++;
> +	mutex_unlock(&stream->dev->lock);
> +
> +	if (ret)
> +		usb_autopm_put_interface(stream->dev->intf);
> +
> +	return ret;
> +}
> +
> +static void uvc_pm_put(struct uvc_streaming *stream)
> +{
> +	mutex_lock(&stream->dev->lock);
> +	if (WARN_ON(!stream->dev->users)) {
> +		mutex_unlock(&stream->dev->lock);
> +		return;
> +	}
> +	stream->dev->users--;
> +	if (!stream->dev->users)
> +		uvc_status_stop(stream->dev);
> +	mutex_unlock(&stream->dev->lock);
> +
> +	usb_autopm_put_interface(stream->dev->intf);
> +}
> +
>  /* ------------------------------------------------------------------------
>   * UVC ioctls
>   */
> @@ -249,6 +289,9 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
>  	 * developers test their webcams with the Linux driver as well as with
>  	 * the Windows driver).
>  	 */
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
>  	mutex_lock(&stream->mutex);
>  	if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
>  		probe->dwMaxVideoFrameSize =
> @@ -257,6 +300,7 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
>  	/* Probe the device. */
>  	ret = uvc_probe_video(stream, probe);
>  	mutex_unlock(&stream->mutex);
> +	uvc_pm_put(stream);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -468,7 +512,13 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
>  	}
>  
>  	/* Probe the device with the new settings. */
> +	ret = uvc_pm_get(stream);
> +	if (ret) {
> +		mutex_unlock(&stream->mutex);
> +		return ret;
> +	}
>  	ret = uvc_probe_video(stream, &probe);
> +	uvc_pm_put(stream);
>  	if (ret < 0) {
>  		mutex_unlock(&stream->mutex);
>  		return ret;
> @@ -559,36 +609,29 @@ static int uvc_v4l2_open(struct file *file)
>  {
>  	struct uvc_streaming *stream;
>  	struct uvc_fh *handle;
> -	int ret = 0;
>  
>  	stream = video_drvdata(file);
>  	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
>  
> -	ret = usb_autopm_get_interface(stream->dev->intf);
> -	if (ret < 0)
> -		return ret;
> -
>  	/* Create the device handle. */
>  	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
> -	if (handle == NULL) {
> -		usb_autopm_put_interface(stream->dev->intf);
> +	if (!handle)
>  		return -ENOMEM;
> -	}
>  
> -	mutex_lock(&stream->dev->lock);
> -	if (stream->dev->users == 0) {
> -		ret = uvc_status_start(stream->dev, GFP_KERNEL);
> -		if (ret < 0) {
> -			mutex_unlock(&stream->dev->lock);
> -			usb_autopm_put_interface(stream->dev->intf);
> +	/*
> +	 * If the uvc evdev exists we cannot suspend when the device
> +	 * is idle. Otherwise we will miss button actions.
> +	 */
> +	if (stream->dev->input) {
> +		int ret;
> +
> +		ret = uvc_pm_get(stream);
> +		if (ret) {
>  			kfree(handle);
>  			return ret;
>  		}
>  	}
>  
> -	stream->dev->users++;
> -	mutex_unlock(&stream->dev->lock);
> -
>  	v4l2_fh_init(&handle->vfh, &stream->vdev);
>  	v4l2_fh_add(&handle->vfh);
>  	handle->chain = stream->chain;
> @@ -610,6 +653,12 @@ static int uvc_v4l2_release(struct file *file)
>  	if (uvc_has_privileges(handle))
>  		uvc_queue_release(&stream->queue);
>  
> +	if (handle->is_streaming)
> +		uvc_pm_put(stream);
> +
> +	if (stream->dev->input)
> +		uvc_pm_put(stream);
> +
>  	/* Release the file handle. */
>  	uvc_dismiss_privileges(handle);
>  	v4l2_fh_del(&handle->vfh);
> @@ -617,12 +666,6 @@ static int uvc_v4l2_release(struct file *file)
>  	kfree(handle);
>  	file->private_data = NULL;
>  
> -	mutex_lock(&stream->dev->lock);
> -	if (--stream->dev->users == 0)
> -		uvc_status_stop(stream->dev);
> -	mutex_unlock(&stream->dev->lock);
> -
> -	usb_autopm_put_interface(stream->dev->intf);
>  	return 0;
>  }
>  
> @@ -849,9 +892,17 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
>  
>  	if (handle->is_streaming)
>  		goto unlock;
> +
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		goto unlock;
> +
>  	ret = uvc_queue_streamon(&stream->queue, type);
>  	handle->is_streaming = !ret;
>  
> +	if (!handle->is_streaming)
> +		uvc_pm_put(stream);
> +
>  unlock:
>  	mutex_unlock(&stream->mutex);
>  
> @@ -875,6 +926,9 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
>  	ret = uvc_queue_streamoff(&stream->queue, type);
>  	handle->is_streaming = !!ret;
>  
> +	if (!handle->is_streaming)
> +		uvc_pm_put(stream);
> +
>  unlock:
>  	mutex_unlock(&stream->mutex);
>  
> @@ -928,6 +982,7 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
>  	u8 *buf;
>  	int ret;
>  
> @@ -941,9 +996,16 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
>  	if (!buf)
>  		return -ENOMEM;
>  
> +	ret = uvc_pm_get(stream);
> +	if (ret) {
> +		kfree(buf);
> +		return ret;
> +	}
> +
>  	ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
>  			     chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
>  			     buf, 1);
> +	uvc_pm_put(stream);
>  	if (!ret)
>  		*input = *buf - 1;
>  
> @@ -956,6 +1018,7 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
>  	u8 *buf;
>  	int ret;
>  
> @@ -977,10 +1040,17 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
>  	if (!buf)
>  		return -ENOMEM;
>  
> +	ret = uvc_pm_get(stream);
> +	if (ret) {
> +		kfree(buf);
> +		return ret;
> +	}
> +
>  	*buf = input + 1;
>  	ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
>  			     chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
>  			     buf, 1);
> +	uvc_pm_put(stream);
>  	kfree(buf);
>  
>  	return ret;
> @@ -991,8 +1061,15 @@ static int uvc_ioctl_queryctrl(struct file *file, void *fh,
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
> +	int ret;
>  
> -	return uvc_query_v4l2_ctrl(chain, qc);
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
> +	ret = uvc_query_v4l2_ctrl(chain, qc);
> +	uvc_pm_put(stream);
> +	return ret;
>  }
>  
>  static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
> @@ -1000,10 +1077,15 @@ static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
>  	struct v4l2_queryctrl qc = { qec->id };
>  	int ret;
>  
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
>  	ret = uvc_query_v4l2_ctrl(chain, &qc);
> +	uvc_pm_put(stream);
>  	if (ret)
>  		return ret;
>  
> @@ -1049,6 +1131,7 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
>  	struct v4l2_ext_control *ctrl = ctrls->controls;
>  	unsigned int i;
>  	int ret;
> @@ -1073,22 +1156,30 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
>  		return 0;
>  	}
>  
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
>  	ret = uvc_ctrl_begin(chain);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		uvc_pm_put(stream);
>  		return ret;
> +	}
>  
>  	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
>  		ret = uvc_ctrl_get(chain, ctrl);
>  		if (ret < 0) {
>  			uvc_ctrl_rollback(handle);
>  			ctrls->error_idx = i;
> -			return ret;
> +			goto done;
>  		}
>  	}
>  
>  	ctrls->error_idx = 0;
>  
> -	return uvc_ctrl_rollback(handle);
> +	ret = uvc_ctrl_rollback(handle);
> +done:
> +	uvc_pm_put(stream);
> +	return ret;
>  }
>  
>  static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
> @@ -1097,6 +1188,7 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
>  {
>  	struct v4l2_ext_control *ctrl = ctrls->controls;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
>  	unsigned int i;
>  	int ret;
>  
> @@ -1104,9 +1196,15 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
> +
>  	ret = uvc_ctrl_begin(chain);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		uvc_pm_put(stream);
>  		return ret;
> +	}
>  
>  	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
>  		ret = uvc_ctrl_set(handle, ctrl);
> @@ -1114,16 +1212,20 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
>  			uvc_ctrl_rollback(handle);
>  			ctrls->error_idx = ioctl == VIDIOC_S_EXT_CTRLS ?
>  						    ctrls->count : i;
> -			return ret;
> +			goto done;
>  		}
>  	}
>  
>  	ctrls->error_idx = 0;
>  
>  	if (ioctl == VIDIOC_S_EXT_CTRLS)
> -		return uvc_ctrl_commit(handle, ctrls);
> +		ret = uvc_ctrl_commit(handle, ctrls);
>  	else
> -		return uvc_ctrl_rollback(handle);
> +		ret = uvc_ctrl_rollback(handle);
> +
> +done:
> +	uvc_pm_put(stream);
> +	return ret;
>  }
>  
>  static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
> @@ -1147,8 +1249,16 @@ static int uvc_ioctl_querymenu(struct file *file, void *fh,
>  {
>  	struct uvc_fh *handle = fh;
>  	struct uvc_video_chain *chain = handle->chain;
> +	struct uvc_streaming *stream = handle->stream;
> +	int ret;
> +
> +	ret = uvc_pm_get(stream);
> +	if (ret)
> +		return ret;
> +	ret = uvc_query_v4l2_menu(chain, qm);
> +	uvc_pm_put(stream);
>  
> -	return uvc_query_v4l2_menu(chain, qm);
> +	return ret;
>  }
>  
>  static int uvc_ioctl_g_selection(struct file *file, void *fh,
> 

-- 
Regards,

Laurent Pinchart