a35bc53848
The pause flag doesn't appear to serve a purpose as it is possible for the pump worker thread to not be running when new buffers are queued. Before the following change was introduced: "43cd0023872e usb: gadget: uvc_video: add worker to handle the frame pumping", the pause flag status was discarded and never returned. This masked a current issues of the userspace receiving non-zero values (considered unsuccessful) and prevents trace_v4l2_qbuf() from being called. Signed-off-by: Dan Vacura <w36195@motorola.com> Link: https://lore.kernel.org/r/20220413192402.26063-1-w36195@motorola.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Bug: 229140375 (cherry picked from commit be30e3502771ac0b5080ec61223d915354cde1cc https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next) Change-Id: Id841e7f0dc6c79f74ca41bb93f2504effc2fefd8 Signed-off-by: Dan Vacura <w36195@motorola.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _UVC_QUEUE_H_
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#define _UVC_QUEUE_H_
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#include <linux/list.h>
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#include <linux/poll.h>
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#include <linux/spinlock.h>
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#include <media/videobuf2-v4l2.h>
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struct file;
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struct mutex;
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/* Maximum frame size in bytes, for sanity checking. */
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#define UVC_MAX_FRAME_SIZE (16*1024*1024)
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/* Maximum number of video buffers. */
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#define UVC_MAX_VIDEO_BUFFERS 32
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/* ------------------------------------------------------------------------
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* Structures.
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*/
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enum uvc_buffer_state {
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UVC_BUF_STATE_IDLE = 0,
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UVC_BUF_STATE_QUEUED = 1,
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UVC_BUF_STATE_ACTIVE = 2,
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UVC_BUF_STATE_DONE = 3,
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UVC_BUF_STATE_ERROR = 4,
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};
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struct uvc_buffer {
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struct vb2_v4l2_buffer buf;
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struct list_head queue;
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enum uvc_buffer_state state;
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void *mem;
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unsigned int length;
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unsigned int bytesused;
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};
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#define UVC_QUEUE_DISCONNECTED (1 << 0)
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#define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
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struct uvc_video_queue {
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struct vb2_queue queue;
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unsigned int flags;
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__u32 sequence;
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unsigned int buf_used;
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spinlock_t irqlock; /* Protects flags and irqqueue */
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struct list_head irqqueue;
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};
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static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
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{
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return vb2_is_streaming(&queue->queue);
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}
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int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
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struct mutex *lock);
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void uvcg_free_buffers(struct uvc_video_queue *queue);
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int uvcg_alloc_buffers(struct uvc_video_queue *queue,
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struct v4l2_requestbuffers *rb);
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int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
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int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
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int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
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struct v4l2_buffer *buf, int nonblocking);
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__poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
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struct file *file, poll_table *wait);
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int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
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#ifndef CONFIG_MMU
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unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
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unsigned long pgoff);
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#endif /* CONFIG_MMU */
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void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
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int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
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struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
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struct uvc_buffer *buf);
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struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
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#endif /* _UVC_QUEUE_H_ */
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