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media: videobuf2-core: integrate with media requests 

Buffers can now be prepared or queued for a request.

A buffer is unbound from the request at vb2_buffer_done time or
when the queue is cancelled.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-05-21 04:54:47 -04:00 committed by Mauro Carvalho Chehab
parent 1cf96dcc6e
commit fd89e0bb6e
4 changed files with 147 additions and 10 deletions
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133
drivers/media/common/videobuf2/videobuf2-core.c
View File

@ -499,8 +499,9 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
pr_info(" buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n",
vb->cnt_buf_init, vb->cnt_buf_cleanup,
vb->cnt_buf_prepare, vb->cnt_buf_finish);
pr_info(" buf_queue: %u buf_done: %u\n",
vb->cnt_buf_queue, vb->cnt_buf_done);
pr_info(" buf_queue: %u buf_done: %u buf_request_complete: %u\n",
vb->cnt_buf_queue, vb->cnt_buf_done,
vb->cnt_buf_request_complete);
pr_info(" alloc: %u put: %u prepare: %u finish: %u mmap: %u\n",
vb->cnt_mem_alloc, vb->cnt_mem_put,
vb->cnt_mem_prepare, vb->cnt_mem_finish,
@ -936,6 +937,14 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
vb->state = state;
}
atomic_dec(&q->owned_by_drv_count);
if (vb->req_obj.req) {
/* This is not supported at the moment */
WARN_ON(state == VB2_BUF_STATE_REQUEUEING);
media_request_object_unbind(&vb->req_obj);
media_request_object_put(&vb->req_obj);
}
spin_unlock_irqrestore(&q->done_lock, flags);
trace_vb2_buf_done(q, vb);
@ -1290,6 +1299,60 @@ static int __buf_prepare(struct vb2_buffer *vb)
return 0;
}
static int vb2_req_prepare(struct media_request_object *obj)
{
struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
int ret;
if (WARN_ON(vb->state != VB2_BUF_STATE_IN_REQUEST))
return -EINVAL;
mutex_lock(vb->vb2_queue->lock);
ret = __buf_prepare(vb);
mutex_unlock(vb->vb2_queue->lock);
return ret;
}
static void __vb2_dqbuf(struct vb2_buffer *vb);
static void vb2_req_unprepare(struct media_request_object *obj)
{
struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
mutex_lock(vb->vb2_queue->lock);
__vb2_dqbuf(vb);
vb->state = VB2_BUF_STATE_IN_REQUEST;
mutex_unlock(vb->vb2_queue->lock);
WARN_ON(!vb->req_obj.req);
}
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
struct media_request *req);
static void vb2_req_queue(struct media_request_object *obj)
{
struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
mutex_lock(vb->vb2_queue->lock);
vb2_core_qbuf(vb->vb2_queue, vb->index, NULL, NULL);
mutex_unlock(vb->vb2_queue->lock);
}
static void vb2_req_release(struct media_request_object *obj)
{
struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
if (vb->state == VB2_BUF_STATE_IN_REQUEST)
vb->state = VB2_BUF_STATE_DEQUEUED;
}
static const struct media_request_object_ops vb2_core_req_ops = {
.prepare = vb2_req_prepare,
.unprepare = vb2_req_unprepare,
.queue = vb2_req_queue,
.release = vb2_req_release,
};
int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
{
struct vb2_buffer *vb;
@ -1315,7 +1378,7 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
dprintk(2, "prepare of buffer %d succeeded\n", vb->index);
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(vb2_core_prepare_buf);
@ -1382,7 +1445,8 @@ static int vb2_start_streaming(struct vb2_queue *q)
return ret;
}
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
struct media_request *req)
{
struct vb2_buffer *vb;
int ret;
@ -1394,8 +1458,39 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
vb = q->bufs[index];
if (req) {
int ret;
if (vb->state != VB2_BUF_STATE_DEQUEUED) {
dprintk(1, "buffer %d not in dequeued state\n",
vb->index);
return -EINVAL;
}
media_request_object_init(&vb->req_obj);
/* Make sure the request is in a safe state for updating. */
ret = media_request_lock_for_update(req);
if (ret)
return ret;
ret = media_request_object_bind(req, &vb2_core_req_ops,
q, true, &vb->req_obj);
media_request_unlock_for_update(req);
if (ret)
return ret;
vb->state = VB2_BUF_STATE_IN_REQUEST;
/* Fill buffer information for the userspace */
if (pb)
call_void_bufop(q, fill_user_buffer, vb, pb);
dprintk(2, "qbuf of buffer %d succeeded\n", vb->index);
return 0;
}
switch (vb->state) {
case VB2_BUF_STATE_DEQUEUED:
case VB2_BUF_STATE_IN_REQUEST:
if (!vb->prepared) {
ret = __buf_prepare(vb);
if (ret)
@ -1601,6 +1696,11 @@ static void __vb2_dqbuf(struct vb2_buffer *vb)
call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv);
vb->planes[i].dbuf_mapped = 0;
}
if (vb->req_obj.req) {
media_request_object_unbind(&vb->req_obj);
media_request_object_put(&vb->req_obj);
}
call_void_bufop(q, init_buffer, vb);
}
int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
@ -1714,6 +1814,25 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
*/
for (i = 0; i < q->num_buffers; ++i) {
struct vb2_buffer *vb = q->bufs[i];
struct media_request *req = vb->req_obj.req;
/*
* If a request is associated with this buffer, then
* call buf_request_cancel() to give the driver to complete()
* related request objects. Otherwise those objects would
* never complete.
*/
if (req) {
enum media_request_state state;
unsigned long flags;
spin_lock_irqsave(&req->lock, flags);
state = req->state;
spin_unlock_irqrestore(&req->lock, flags);
if (state == MEDIA_REQUEST_STATE_QUEUED)
call_void_vb_qop(vb, buf_request_complete, vb);
}
if (vb->synced) {
unsigned int plane;
@ -2283,7 +2402,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
* Queue all buffers.
*/
for (i = 0; i < q->num_buffers; i++) {
ret = vb2_core_qbuf(q, i, NULL);
ret = vb2_core_qbuf(q, i, NULL, NULL);
if (ret)
goto err_reqbufs;
fileio->bufs[i].queued = 1;
@ -2462,7 +2581,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
if (copy_timestamp)
b->timestamp = ktime_get_ns();
ret = vb2_core_qbuf(q, index, NULL);
ret = vb2_core_qbuf(q, index, NULL, NULL);
dprintk(5, "vb2_dbuf result: %d\n", ret);
if (ret)
return ret;
@ -2565,7 +2684,7 @@ static int vb2_thread(void *data)
if (copy_timestamp)
vb->timestamp = ktime_get_ns();
if (!threadio->stop)
ret = vb2_core_qbuf(q, vb->index, NULL);
ret = vb2_core_qbuf(q, vb->index, NULL, NULL);
call_void_qop(q, wait_prepare, q);
if (ret || threadio->stop)
break;

4
drivers/media/common/videobuf2/videobuf2-v4l2.c
View File

@ -441,6 +441,8 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
case VB2_BUF_STATE_ACTIVE:
b->flags |= V4L2_BUF_FLAG_QUEUED;
break;
case VB2_BUF_STATE_IN_REQUEST:
break;
case VB2_BUF_STATE_ERROR:
b->flags |= V4L2_BUF_FLAG_ERROR;
/* fall through */
@ -619,7 +621,7 @@ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
}
ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
return ret ? ret : vb2_core_qbuf(q, b->index, b);
return ret ? ret : vb2_core_qbuf(q, b->index, b, NULL);
}
EXPORT_SYMBOL_GPL(vb2_qbuf);

2
drivers/media/dvb-core/dvb_vb2.c
View File

@ -384,7 +384,7 @@ int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
int ret;
ret = vb2_core_qbuf(&ctx->vb_q, b->index, b);
ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL);
if (ret) {
dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
b->index, ret);

18
include/media/videobuf2-core.h
View File

@ -204,6 +204,7 @@ enum vb2_io_modes {
/**
* enum vb2_buffer_state - current video buffer state.
* @VB2_BUF_STATE_DEQUEUED: buffer under userspace control.
* @VB2_BUF_STATE_IN_REQUEST: buffer is queued in media request.
* @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf.
* @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver.
* @VB2_BUF_STATE_REQUEUEING: re-queue a buffer to the driver.
@ -217,6 +218,7 @@ enum vb2_io_modes {
*/
enum vb2_buffer_state {
VB2_BUF_STATE_DEQUEUED,
VB2_BUF_STATE_IN_REQUEST,
VB2_BUF_STATE_PREPARING,
VB2_BUF_STATE_QUEUED,
VB2_BUF_STATE_REQUEUEING,
@ -297,6 +299,7 @@ struct vb2_buffer {
u32 cnt_buf_finish;
u32 cnt_buf_cleanup;
u32 cnt_buf_queue;
u32 cnt_buf_request_complete;
/* This counts the number of calls to vb2_buffer_done() */
u32 cnt_buf_done;
@ -390,6 +393,11 @@ struct vb2_buffer {
* ioctl; might be called before @start_streaming callback
* if user pre-queued buffers before calling
* VIDIOC_STREAMON().
* @buf_request_complete: a buffer that was never queued to the driver but is
* associated with a queued request was canceled.
* The driver will have to mark associated objects in the
* request as completed; required if requests are
* supported.
*/
struct vb2_ops {
int (*queue_setup)(struct vb2_queue *q,
@ -408,6 +416,8 @@ struct vb2_ops {
void (*stop_streaming)(struct vb2_queue *q);
void (*buf_queue)(struct vb2_buffer *vb);
void (*buf_request_complete)(struct vb2_buffer *vb);
};
/**
@ -765,12 +775,17 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
* @index: id number of the buffer
* @pb: buffer structure passed from userspace to
* v4l2_ioctl_ops->vidioc_qbuf handler in driver
* @req: pointer to &struct media_request, may be NULL.
*
* Videobuf2 core helper to implement VIDIOC_QBUF() operation. It is called
* internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
*
* This function:
*
* #) If @req is non-NULL, then the buffer will be bound to this
* media request and it returns. The buffer will be prepared and
* queued to the driver (i.e. the next two steps) when the request
* itself is queued.
* #) if necessary, calls &vb2_ops->buf_prepare callback in the driver
* (if provided), in which driver-specific buffer initialization can
* be performed;
@ -779,7 +794,8 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
*
* Return: returns zero on success; an error code otherwise.
*/
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
struct media_request *req);
/**
* vb2_core_dqbuf() - Dequeue a buffer to the userspace