Replace the current video buffers queue implementation with
videobuf2-vmalloc.
Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
drivers/media/video/uvc/Kconfig | 1 +
drivers/media/video/uvc/uvc_queue.c | 556 +++++++++--------------------------
drivers/media/video/uvc/uvc_v4l2.c | 19 +-
drivers/media/video/uvc/uvc_video.c | 9 +-
drivers/media/video/uvc/uvcvideo.h | 33 +--
5 files changed, 161 insertions(+), 457 deletions(-)
diff --git a/drivers/media/video/uvc/Kconfig b/drivers/media/video/uvc/Kconfig
index 2956a76..6c197da 100644
--- a/drivers/media/video/uvc/Kconfig
+++ b/drivers/media/video/uvc/Kconfig
@@ -1,5 +1,6 @@
config USB_VIDEO_CLASS
tristate "USB Video Class (UVC)"
+ select VIDEOBUF2_VMALLOC
---help---
Support for the USB Video Class (UVC). Currently only video
input devices, such as webcams, are supported.
diff --git a/drivers/media/video/uvc/uvc_queue.c
b/drivers/media/video/uvc/uvc_queue.c
index 0fbb04b..a5122a1 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -11,6 +11,7 @@
*
*/
+#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/list.h>
@@ -19,7 +20,7 @@
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
-#include <linux/atomic.h>
+#include <media/videobuf2-vmalloc.h>
#include "uvcvideo.h"
@@ -29,470 +30,199 @@
* Video queues is initialized by uvc_queue_init(). The function performs
* basic initialization of the uvc_video_queue struct and never fails.
*
- * Video buffer allocation and freeing are performed by uvc_alloc_buffers and
- * uvc_free_buffers respectively. The former acquires the video queue lock,
- * while the later must be called with the lock held (so that allocation can
- * free previously allocated buffers). Trying to free buffers that are mapped
- * to user space will return -EBUSY.
- *
- * Video buffers are managed using two queues. However, unlike most USB video
- * drivers that use an in queue and an out queue, we use a main queue to hold
- * all queued buffers (both 'empty' and 'done' buffers), and an irq queue to
- * hold empty buffers. This design (copied from video-buf) minimizes locking
- * in interrupt, as only one queue is shared between interrupt and user
- * contexts.
- *
- * Use cases
- * ---------
- *
- * Unless stated otherwise, all operations that modify the irq buffers queue
- * are protected by the irq spinlock.
- *
- * 1. The user queues the buffers, starts streaming and dequeues a buffer.
- *
- * The buffers are added to the main and irq queues. Both operations are
- * protected by the queue lock, and the later is protected by the irq
- * spinlock as well.
- *
- * The completion handler fetches a buffer from the irq queue and fills it
- * with video data. If no buffer is available (irq queue empty), the handler
- * returns immediately.
- *
- * When the buffer is full, the completion handler removes it from the irq
- * queue, marks it as done (UVC_BUF_STATE_DONE) and wakes its wait queue.
- * At that point, any process waiting on the buffer will be woken up. If a
- * process tries to dequeue a buffer after it has been marked done, the
- * dequeing will succeed immediately.
- *
- * 2. Buffers are queued, user is waiting on a buffer and the device gets
- * disconnected.
- *
- * When the device is disconnected, the kernel calls the completion handler
- * with an appropriate status code. The handler marks all buffers in the
- * irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so
- * that any process waiting on a buffer gets woken up.
- *
- * Waking up up the first buffer on the irq list is not enough, as the
- * process waiting on the buffer might restart the dequeue operation
- * immediately.
- *
+ * Video buffers are managed by videobuf2. The driver uses a mutex to protect
+ * the videobuf2 queue operations by serializing calls to videobuf2 and a
+ * spinlock to protect the IRQ queue that holds the buffers to be processed by
+ * the driver.
*/
-void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
- int drop_corrupted)
-{
- mutex_init(&queue->mutex);
- spin_lock_init(&queue->irqlock);
- INIT_LIST_HEAD(&queue->mainqueue);
- INIT_LIST_HEAD(&queue->irqqueue);
- queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0;
- queue->type = type;
-}
-
-/*
- * Free the video buffers.
- *
- * This function must be called with the queue lock held.
+/*
-----------------------------------------------------------------------------
+ * videobuf2 queue operations
*/
-static int __uvc_free_buffers(struct uvc_video_queue *queue)
+
+static int uvc_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
+ unsigned int *nplanes, unsigned int sizes[],
+ void *alloc_ctxs[])
{
- unsigned int i;
+ struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+ struct uvc_streaming *stream =
+ container_of(queue, struct uvc_streaming, queue);
- for (i = 0; i < queue->count; ++i) {
- if (queue->buffer[i].vma_use_count != 0)
- return -EBUSY;
- }
+ if (*nbuffers > UVC_MAX_VIDEO_BUFFERS)
+ *nbuffers = UVC_MAX_VIDEO_BUFFERS;
- if (queue->count) {
- uvc_queue_cancel(queue, 0);
- INIT_LIST_HEAD(&queue->mainqueue);
- vfree(queue->mem);
- queue->count = 0;
- }
+ *nplanes = 1;
+
+ sizes[0] = stream->ctrl.dwMaxVideoFrameSize;
return 0;
}
-int uvc_free_buffers(struct uvc_video_queue *queue)
+static int uvc_buffer_prepare(struct vb2_buffer *vb)
{
- int ret;
-
- mutex_lock(&queue->mutex);
- ret = __uvc_free_buffers(queue);
- mutex_unlock(&queue->mutex);
-
- return ret;
-}
+ struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
+ struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
-/*
- * Allocate the video buffers.
- *
- * Pages are reserved to make sure they will not be swapped, as they will be
- * filled in the URB completion handler.
- *
- * Buffers will be individually mapped, so they must all be page aligned.
- */
-int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers,
- unsigned int buflength)
-{
- unsigned int bufsize = PAGE_ALIGN(buflength);
- unsigned int i;
- void *mem = NULL;
- int ret;
+ if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
+ vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
+ uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
+ return -EINVAL;
+ }
- if (nbuffers > UVC_MAX_VIDEO_BUFFERS)
- nbuffers = UVC_MAX_VIDEO_BUFFERS;
+ if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED))
+ return -ENODEV;
- mutex_lock(&queue->mutex);
+ buf->state = UVC_BUF_STATE_QUEUED;
+ buf->error = 0;
+ buf->mem = vb2_plane_vaddr(vb, 0);
+ buf->length = vb2_plane_size(vb, 0);
+ if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ buf->bytesused = 0;
+ else
+ buf->bytesused = vb2_get_plane_payload(vb, 0);
- if ((ret = __uvc_free_buffers(queue)) < 0)
- goto done;
+ return 0;
+}
- /* Bail out if no buffers should be allocated. */
- if (nbuffers == 0)
- goto done;
+static void uvc_buffer_queue(struct vb2_buffer *vb)
+{
+ struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
+ struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
+ unsigned long flags;
- /* Decrement the number of buffers until allocation succeeds. */
- for (; nbuffers > 0; --nbuffers) {
- mem = vmalloc_32(nbuffers * bufsize);
- if (mem != NULL)
- break;
+ spin_lock_irqsave(&queue->irqlock, flags);
+ if (likely(!(queue->flags & UVC_QUEUE_DISCONNECTED))) {
+ list_add_tail(&buf->queue, &queue->irqqueue);
+ } else {
+ /* If the device is disconnected return the buffer to userspace
+ * directly. The next QBUF call will fail with -ENODEV.
+ */
+ buf->state = UVC_BUF_STATE_ERROR;
+ vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR);
}
- if (mem == NULL) {
- ret = -ENOMEM;
- goto done;
- }
+ spin_unlock_irqrestore(&queue->irqlock, flags);
+}
- for (i = 0; i < nbuffers; ++i) {
- memset(&queue->buffer[i], 0, sizeof queue->buffer[i]);
- queue->buffer[i].buf.index = i;
- queue->buffer[i].buf.m.offset = i * bufsize;
- queue->buffer[i].buf.length = buflength;
- queue->buffer[i].buf.type = queue->type;
- queue->buffer[i].buf.field = V4L2_FIELD_NONE;
- queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
- queue->buffer[i].buf.flags = 0;
-
- queue->buffer[i].mem = queue->mem + i * bufsize;
- queue->buffer[i].length = buflength;
- init_waitqueue_head(&queue->buffer[i].wait);
- }
+static struct vb2_ops uvc_queue_qops = {
+ .queue_setup = uvc_queue_setup,
+ .buf_prepare = uvc_buffer_prepare,
+ .buf_queue = uvc_buffer_queue,
+};
- queue->mem = mem;
- queue->count = nbuffers;
- queue->buf_size = bufsize;
- ret = nbuffers;
+void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
+ int drop_corrupted)
+{
+ queue->queue.type = type;
+ queue->queue.io_modes = VB2_MMAP;
+ queue->queue.drv_priv = queue;
+ queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
+ queue->queue.ops = &uvc_queue_qops;
+ queue->queue.mem_ops = &vb2_vmalloc_memops;
+ vb2_queue_init(&queue->queue);
-done:
- mutex_unlock(&queue->mutex);
- return ret;
+ mutex_init(&queue->mutex);
+ spin_lock_init(&queue->irqlock);
+ INIT_LIST_HEAD(&queue->irqqueue);
+ queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0;
}
-/*
- * Check if buffers have been allocated.
+/*
-----------------------------------------------------------------------------
+ * V4L2 queue operations
*/
-int uvc_queue_allocated(struct uvc_video_queue *queue)
+
+int uvc_alloc_buffers(struct uvc_video_queue *queue,
+ struct v4l2_requestbuffers *rb, unsigned int buflength)
{
- int allocated;
+ int ret;
mutex_lock(&queue->mutex);
- allocated = queue->count != 0;
+ ret = vb2_reqbufs(&queue->queue, rb);
mutex_unlock(&queue->mutex);
- return allocated;
+ return ret ? ret : rb->count;
}
-static void __uvc_query_buffer(struct uvc_buffer *buf,
- struct v4l2_buffer *v4l2_buf)
+void uvc_free_buffers(struct uvc_video_queue *queue)
{
- memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf);
-
- if (buf->vma_use_count)
- v4l2_buf->flags |= V4L2_BUF_FLAG_MAPPED;
-
- switch (buf->state) {
- case UVC_BUF_STATE_ERROR:
- case UVC_BUF_STATE_DONE:
- v4l2_buf->flags |= V4L2_BUF_FLAG_DONE;
- break;
- case UVC_BUF_STATE_QUEUED:
- case UVC_BUF_STATE_ACTIVE:
- case UVC_BUF_STATE_READY:
- v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
- break;
- case UVC_BUF_STATE_IDLE:
- default:
- break;
- }
+ mutex_lock(&queue->mutex);
+ vb2_queue_release(&queue->queue);
+ mutex_unlock(&queue->mutex);
}
-int uvc_query_buffer(struct uvc_video_queue *queue,
- struct v4l2_buffer *v4l2_buf)
+int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
{
- int ret = 0;
+ int ret;
mutex_lock(&queue->mutex);
- if (v4l2_buf->index >= queue->count) {
- ret = -EINVAL;
- goto done;
- }
-
- __uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf);
-
-done:
+ ret = vb2_querybuf(&queue->queue, buf);
mutex_unlock(&queue->mutex);
+
return ret;
}
-/*
- * Queue a video buffer. Attempting to queue a buffer that has already been
- * queued will return -EINVAL.
- */
-int uvc_queue_buffer(struct uvc_video_queue *queue,
- struct v4l2_buffer *v4l2_buf)
+int uvc_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
{
- struct uvc_buffer *buf;
- unsigned long flags;
- int ret = 0;
-
- uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);
-
- if (v4l2_buf->type != queue->type ||
- v4l2_buf->memory != V4L2_MEMORY_MMAP) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
- "and/or memory (%u).\n", v4l2_buf->type,
- v4l2_buf->memory);
- return -EINVAL;
- }
+ int ret;
mutex_lock(&queue->mutex);
- if (v4l2_buf->index >= queue->count) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n");
- ret = -EINVAL;
- goto done;
- }
-
- buf = &queue->buffer[v4l2_buf->index];
- if (buf->state != UVC_BUF_STATE_IDLE) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state "
- "(%u).\n", buf->state);
- ret = -EINVAL;
- goto done;
- }
-
- if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
- v4l2_buf->bytesused > buf->buf.length) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
- ret = -EINVAL;
- goto done;
- }
-
- spin_lock_irqsave(&queue->irqlock, flags);
- if (queue->flags & UVC_QUEUE_DISCONNECTED) {
- spin_unlock_irqrestore(&queue->irqlock, flags);
- ret = -ENODEV;
- goto done;
- }
- buf->state = UVC_BUF_STATE_QUEUED;
- if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
- buf->bytesused = 0;
- else
- buf->bytesused = v4l2_buf->bytesused;
-
- list_add_tail(&buf->stream, &queue->mainqueue);
- list_add_tail(&buf->queue, &queue->irqqueue);
- spin_unlock_irqrestore(&queue->irqlock, flags);
-
-done:
+ ret = vb2_qbuf(&queue->queue, buf);
mutex_unlock(&queue->mutex);
- return ret;
-}
-static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking)
-{
- if (nonblocking) {
- return (buf->state != UVC_BUF_STATE_QUEUED &&
- buf->state != UVC_BUF_STATE_ACTIVE &&
- buf->state != UVC_BUF_STATE_READY)
- ? 0 : -EAGAIN;
- }
-
- return wait_event_interruptible(buf->wait,
- buf->state != UVC_BUF_STATE_QUEUED &&
- buf->state != UVC_BUF_STATE_ACTIVE &&
- buf->state != UVC_BUF_STATE_READY);
+ return ret;
}
-/*
- * Dequeue a video buffer. If nonblocking is false, block until a buffer is
- * available.
- */
-int uvc_dequeue_buffer(struct uvc_video_queue *queue,
- struct v4l2_buffer *v4l2_buf, int nonblocking)
+int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
+ int nonblocking)
{
- struct uvc_buffer *buf;
- int ret = 0;
-
- if (v4l2_buf->type != queue->type ||
- v4l2_buf->memory != V4L2_MEMORY_MMAP) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
- "and/or memory (%u).\n", v4l2_buf->type,
- v4l2_buf->memory);
- return -EINVAL;
- }
+ int ret;
mutex_lock(&queue->mutex);
- if (list_empty(&queue->mainqueue)) {
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n");
- ret = -EINVAL;
- goto done;
- }
-
- buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
- if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0)
- goto done;
-
- uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n",
- buf->buf.index, buf->state, buf->buf.bytesused);
-
- switch (buf->state) {
- case UVC_BUF_STATE_ERROR:
- uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
- "(transmission error).\n");
- ret = -EIO;
- case UVC_BUF_STATE_DONE:
- buf->state = UVC_BUF_STATE_IDLE;
- break;
-
- case UVC_BUF_STATE_IDLE:
- case UVC_BUF_STATE_QUEUED:
- case UVC_BUF_STATE_ACTIVE:
- case UVC_BUF_STATE_READY:
- default:
- uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
- "(driver bug?).\n", buf->state);
- ret = -EINVAL;
- goto done;
- }
-
- list_del(&buf->stream);
- __uvc_query_buffer(buf, v4l2_buf);
-
-done:
+ ret = vb2_dqbuf(&queue->queue, buf, nonblocking);
mutex_unlock(&queue->mutex);
- return ret;
-}
-/*
- * VMA operations.
- */
-static void uvc_vm_open(struct vm_area_struct *vma)
-{
- struct uvc_buffer *buffer = vma->vm_private_data;
- buffer->vma_use_count++;
-}
-
-static void uvc_vm_close(struct vm_area_struct *vma)
-{
- struct uvc_buffer *buffer = vma->vm_private_data;
- buffer->vma_use_count--;
+ return ret;
}
-static const struct vm_operations_struct uvc_vm_ops = {
- .open = uvc_vm_open,
- .close = uvc_vm_close,
-};
-
-/*
- * Memory-map a video buffer.
- *
- * This function implements video buffers memory mapping and is intended to be
- * used by the device mmap handler.
- */
int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
{
- struct uvc_buffer *uninitialized_var(buffer);
- struct page *page;
- unsigned long addr, start, size;
- unsigned int i;
- int ret = 0;
-
- start = vma->vm_start;
- size = vma->vm_end - vma->vm_start;
+ int ret;
mutex_lock(&queue->mutex);
+ ret = vb2_mmap(&queue->queue, vma);
+ mutex_unlock(&queue->mutex);
- for (i = 0; i < queue->count; ++i) {
- buffer = &queue->buffer[i];
- if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
- break;
- }
-
- if (i == queue->count || PAGE_ALIGN(size) != queue->buf_size) {
- ret = -EINVAL;
- goto done;
- }
-
- /*
- * VM_IO marks the area as being an mmaped region for I/O to a
- * device. It also prevents the region from being core dumped.
- */
- vma->vm_flags |= VM_IO;
-
- addr = (unsigned long)buffer->mem;
-#ifdef CONFIG_MMU
- while (size > 0) {
- page = vmalloc_to_page((void *)addr);
- if ((ret = vm_insert_page(vma, start, page)) < 0)
- goto done;
-
- start += PAGE_SIZE;
- addr += PAGE_SIZE;
- size -= PAGE_SIZE;
- }
-#endif
+ return ret;
+}
- vma->vm_ops = &uvc_vm_ops;
- vma->vm_private_data = buffer;
- uvc_vm_open(vma);
+unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
+ poll_table *wait)
+{
+ unsigned int ret;
-done:
+ mutex_lock(&queue->mutex);
+ ret = vb2_poll(&queue->queue, file, wait);
mutex_unlock(&queue->mutex);
+
return ret;
}
-/*
- * Poll the video queue.
+/*
-----------------------------------------------------------------------------
*
- * This function implements video queue polling and is intended to be used by
- * the device poll handler.
*/
-unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
- poll_table *wait)
+
+/*
+ * Check if buffers have been allocated.
+ */
+int uvc_queue_allocated(struct uvc_video_queue *queue)
{
- struct uvc_buffer *buf;
- unsigned int mask = 0;
+ int allocated;
mutex_lock(&queue->mutex);
- if (list_empty(&queue->mainqueue)) {
- mask |= POLLERR;
- goto done;
- }
- buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
-
- poll_wait(file, &buf->wait, wait);
- if (buf->state == UVC_BUF_STATE_DONE ||
- buf->state == UVC_BUF_STATE_ERROR) {
- if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
- mask |= POLLIN | POLLRDNORM;
- else
- mask |= POLLOUT | POLLWRNORM;
- }
-
-done:
+ allocated = vb2_is_busy(&queue->queue);
mutex_unlock(&queue->mutex);
- return mask;
+
+ return allocated;
}
#ifndef CONFIG_MMU
@@ -543,27 +273,24 @@ done:
*/
int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
{
- unsigned int i;
- int ret = 0;
+ unsigned long flags;
+ int ret;
mutex_lock(&queue->mutex);
if (enable) {
- if (uvc_queue_streaming(queue)) {
- ret = -EBUSY;
+ ret = vb2_streamon(&queue->queue, queue->queue.type);
+ if (ret < 0)
goto done;
- }
- queue->flags |= UVC_QUEUE_STREAMING;
+
queue->buf_used = 0;
} else {
- uvc_queue_cancel(queue, 0);
- INIT_LIST_HEAD(&queue->mainqueue);
-
- for (i = 0; i < queue->count; ++i) {
- queue->buffer[i].error = 0;
- queue->buffer[i].state = UVC_BUF_STATE_IDLE;
- }
+ ret = vb2_streamoff(&queue->queue, queue->queue.type);
+ if (ret < 0)
+ goto done;
- queue->flags &= ~UVC_QUEUE_STREAMING;
+ spin_lock_irqsave(&queue->irqlock, flags);
+ INIT_LIST_HEAD(&queue->irqqueue);
+ spin_unlock_irqrestore(&queue->irqlock, flags);
}
done:
@@ -594,12 +321,12 @@ void uvc_queue_cancel(struct uvc_video_queue *queue, int
disconnect)
queue);
list_del(&buf->queue);
buf->state = UVC_BUF_STATE_ERROR;
- wake_up(&buf->wait);
+ vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR);
}
/* This must be protected by the irqlock spinlock to avoid race
- * conditions between uvc_queue_buffer and the disconnection event that
+ * conditions between uvc_buffer_queue and the disconnection event that
* could result in an interruptible wait in uvc_dequeue_buffer. Do not
- * blindly replace this logic by checking for the UVC_DEV_DISCONNECTED
+ * blindly replace this logic by checking for the UVC_QUEUE_DISCONNECTED
* state outside the queue code.
*/
if (disconnect)
@@ -616,15 +343,12 @@ struct uvc_buffer *uvc_queue_next_buffer(struct
uvc_video_queue *queue,
if ((queue->flags & UVC_QUEUE_DROP_CORRUPTED) && buf->error) {
buf->error = 0;
buf->state = UVC_BUF_STATE_QUEUED;
- buf->buf.bytesused = 0;
+ vb2_set_plane_payload(&buf->buf, 0, 0);
return buf;
}
spin_lock_irqsave(&queue->irqlock, flags);
list_del(&buf->queue);
- buf->error = 0;
- buf->state = UVC_BUF_STATE_DONE;
- buf->buf.bytesused = buf->bytesused;
if (!list_empty(&queue->irqqueue))
nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
queue);
@@ -632,7 +356,9 @@ struct uvc_buffer *uvc_queue_next_buffer(struct
uvc_video_queue *queue,
nextbuf = NULL;
spin_unlock_irqrestore(&queue->irqlock, flags);
- wake_up(&buf->wait);
+ buf->state = buf->error ? VB2_BUF_STATE_ERROR : UVC_BUF_STATE_DONE;
+ vb2_set_plane_payload(&buf->buf, 0, buf->bytesused);
+ vb2_buffer_done(&buf->buf, VB2_BUF_STATE_DONE);
+
return nextbuf;
}
-
diff --git a/drivers/media/video/uvc/uvc_v4l2.c
b/drivers/media/video/uvc/uvc_v4l2.c
index dadf11f..9d57fbb 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -513,10 +513,7 @@ static int uvc_v4l2_release(struct file *file)
/* Only free resources if this is a privileged handle. */
if (uvc_has_privileges(handle)) {
uvc_video_enable(stream, 0);
-
- if (uvc_free_buffers(&stream->queue) < 0)
- uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
- "free buffers.\n");
+ uvc_free_buffers(&stream->queue);
}
/* Release the file handle. */
@@ -914,18 +911,11 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned
int cmd, void *arg)
/* Buffers & streaming */
case VIDIOC_REQBUFS:
- {
- struct v4l2_requestbuffers *rb = arg;
-
- if (rb->type != stream->type ||
- rb->memory != V4L2_MEMORY_MMAP)
- return -EINVAL;
-
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
mutex_lock(&stream->mutex);
- ret = uvc_alloc_buffers(&stream->queue, rb->count,
+ ret = uvc_alloc_buffers(&stream->queue, arg,
stream->ctrl.dwMaxVideoFrameSize);
mutex_unlock(&stream->mutex);
if (ret < 0)
@@ -934,18 +924,13 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned
int cmd, void *arg)
if (ret == 0)
uvc_dismiss_privileges(handle);
- rb->count = ret;
ret = 0;
break;
- }
case VIDIOC_QUERYBUF:
{
struct v4l2_buffer *buf = arg;
- if (buf->type != stream->type)
- return -EINVAL;
-
if (!uvc_has_privileges(handle))
return -EBUSY;
diff --git a/drivers/media/video/uvc/uvc_video.c
b/drivers/media/video/uvc/uvc_video.c
index 00fe749..2995f26 100644
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -467,9 +467,10 @@ static int uvc_video_decode_start(struct uvc_streaming
*stream,
else
ktime_get_real_ts(&ts);
- buf->buf.sequence = stream->sequence;
- buf->buf.timestamp.tv_sec = ts.tv_sec;
- buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+ buf->buf.v4l2_buf.sequence = stream->sequence;
+ buf->buf.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
+ buf->buf.v4l2_buf.timestamp.tv_usec =
+ ts.tv_nsec / NSEC_PER_USEC;
/* TODO: Handle PTS and SCR. */
buf->state = UVC_BUF_STATE_ACTIVE;
@@ -728,7 +729,7 @@ static void uvc_video_encode_bulk(struct urb *urb, struct
uvc_streaming *stream,
if (buf->bytesused == stream->queue.buf_used) {
stream->queue.buf_used = 0;
buf->state = UVC_BUF_STATE_READY;
- buf->buf.sequence = ++stream->sequence;
+ buf->buf.v4l2_buf.sequence = ++stream->sequence;
uvc_queue_next_buffer(&stream->queue, buf);
stream->last_fid ^= UVC_STREAM_FID;
}
diff --git a/drivers/media/video/uvc/uvcvideo.h
b/drivers/media/video/uvc/uvcvideo.h
index 55f9171..842682d 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -13,6 +13,7 @@
#include <linux/videodev2.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
+#include <media/videobuf2-core.h>
/* --------------------------------------------------------------------------
* UVC constants
@@ -319,13 +320,9 @@ enum uvc_buffer_state {
};
struct uvc_buffer {
- unsigned long vma_use_count;
- struct list_head stream;
-
- /* Touched by interrupt handler. */
- struct v4l2_buffer buf;
+ struct vb2_buffer buf;
struct list_head queue;
- wait_queue_head_t wait;
+
enum uvc_buffer_state state;
unsigned int error;
@@ -334,24 +331,17 @@ struct uvc_buffer {
unsigned int bytesused;
};
-#define UVC_QUEUE_STREAMING (1 << 0)
-#define UVC_QUEUE_DISCONNECTED (1 << 1)
-#define UVC_QUEUE_DROP_CORRUPTED (1 << 2)
+#define UVC_QUEUE_DISCONNECTED (1 << 0)
+#define UVC_QUEUE_DROP_CORRUPTED (1 << 1)
struct uvc_video_queue {
- enum v4l2_buf_type type;
+ struct vb2_queue queue;
+ struct mutex mutex; /* Protects queue */
- void *mem;
unsigned int flags;
-
- unsigned int count;
- unsigned int buf_size;
unsigned int buf_used;
- struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
- struct mutex mutex; /* protects buffers and mainqueue */
- spinlock_t irqlock; /* protects irqqueue */
- struct list_head mainqueue;
+ spinlock_t irqlock; /* Protects irqqueue */
struct list_head irqqueue;
};
@@ -391,6 +381,7 @@ struct uvc_streaming {
*/
struct mutex mutex;
+ /* Buffers queue. */
unsigned int frozen : 1;
struct uvc_video_queue queue;
void (*decode) (struct urb *urb, struct uvc_streaming *video,
@@ -520,8 +511,8 @@ extern struct uvc_entity *uvc_entity_by_id(struct
uvc_device *dev, int id);
extern void uvc_queue_init(struct uvc_video_queue *queue,
enum v4l2_buf_type type, int drop_corrupted);
extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
- unsigned int nbuffers, unsigned int buflength);
-extern int uvc_free_buffers(struct uvc_video_queue *queue);
+ struct v4l2_requestbuffers *rb, unsigned int buflength);
+extern void uvc_free_buffers(struct uvc_video_queue *queue);
extern int uvc_query_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf);
extern int uvc_queue_buffer(struct uvc_video_queue *queue,
@@ -543,7 +534,7 @@ extern unsigned long uvc_queue_get_unmapped_area(struct
uvc_video_queue *queue,
extern int uvc_queue_allocated(struct uvc_video_queue *queue);
static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
- return queue->flags & UVC_QUEUE_STREAMING;
+ return vb2_is_streaming(&queue->queue);
}
/* V4L2 interface */
--
1.7.3.4
--
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