- 根目录:
- drivers
- media
- v4l2-core
- v4l2-mem2mem.c
/*
* Memory-to-memory device framework for Video for Linux 2 and videobuf.
*
* Helper functions for devices that use videobuf buffers for both their
* source and destination.
*
* Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
* Pawel Osciak, <pawel@osciak.com>
* Marek Szyprowski, <m.szyprowski@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <media/videobuf2-core.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
MODULE_LICENSE("GPL");
static bool debug;
module_param(debug, bool, 0644);
#define dprintk(fmt, arg...) \
do { \
if (debug) \
printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
} while (0)
/* Instance is already queued on the job_queue */
#define TRANS_QUEUED (1 << 0)
/* Instance is currently running in hardware */
#define TRANS_RUNNING (1 << 1)
/* Instance is currently aborting */
#define TRANS_ABORT (1 << 2)
/* Offset base for buffers on the destination queue - used to distinguish
* between source and destination buffers when mmapping - they receive the same
* offsets but for different queues */
#define DST_QUEUE_OFF_BASE (1 << 30)
/**
* struct v4l2_m2m_dev - per-device context
* @curr_ctx: currently running instance
* @job_queue: instances queued to run
* @job_spinlock: protects job_queue
* @m2m_ops: driver callbacks
*/
struct v4l2_m2m_dev {
struct v4l2_m2m_ctx *curr_ctx;
struct list_head job_queue;
spinlock_t job_spinlock;
const struct v4l2_m2m_ops *m2m_ops;
};
static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
enum v4l2_buf_type type)
{
if (V4L2_TYPE_IS_OUTPUT(type))
return &m2m_ctx->out_q_ctx;
else
return &m2m_ctx->cap_q_ctx;
}
/**
* v4l2_m2m_get_vq() - return vb2_queue for the given type
*/
struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
enum v4l2_buf_type type)
{
struct v4l2_m2m_queue_ctx *q_ctx;
q_ctx = get_queue_ctx(m2m_ctx, type);
if (!q_ctx)
return NULL;
return &q_ctx->q;
}
EXPORT_SYMBOL(v4l2_m2m_get_vq);
/**
* v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
*/
void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b = NULL;
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
if (list_empty(&q_ctx->rdy_queue)) {
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return NULL;
}
b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
/**
* v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
* return it
*/
void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b = NULL;
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
if (list_empty(&q_ctx->rdy_queue)) {
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return NULL;
}
b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
list_del(&b->list);
q_ctx->num_rdy--;
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
/*
* Scheduling handlers
*/
/**
* v4l2_m2m_get_curr_priv() - return driver private data for the currently
* running instance or NULL if no instance is running
*/
void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
{
unsigned long flags;
void *ret = NULL;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
if (m2m_dev->curr_ctx)
ret = m2m_dev->curr_ctx->priv;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
return ret;
}
EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
/**
* v4l2_m2m_try_run() - select next job to perform and run it if possible
*
* Get next transaction (if present) from the waiting jobs list and run it.
*/
static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
{
unsigned long flags;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
if (NULL != m2m_dev->curr_ctx) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
dprintk("Another instance is running, won't run now\n");
return;
}
if (list_empty(&m2m_dev->job_queue)) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
dprintk("No job pending\n");
return;
}
m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
struct v4l2_m2m_ctx, queue);
m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
}
/**
* v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
* the pending job queue and add it if so.
* @m2m_ctx: m2m context assigned to the instance to be checked
*
* There are three basic requirements an instance has to meet to be able to run:
* 1) at least one source buffer has to be queued,
* 2) at least one destination buffer has to be queued,
* 3) streaming has to be on.
*
* If a queue is buffered (for example a decoder hardware ringbuffer that has
* to be drained before doing streamoff), allow scheduling without v4l2 buffers
* on that queue.
*
* There may also be additional, custom requirements. In such case the driver
* should supply a custom callback (job_ready in v4l2_m2m_ops) that should
* return 1 if the instance is ready.
* An example of the above could be an instance that requires more than one
* src/dst buffer per transaction.
*/
void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
{
struct v4l2_m2m_dev *m2m_dev;
unsigned long flags_job, flags_out, flags_cap;
m2m_dev = m2m_ctx->m2m_dev;
dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
if (!m2m_ctx->out_q_ctx.q.streaming
|| !m2m_ctx->cap_q_ctx.q.streaming) {
dprintk("Streaming needs to be on for both queues\n");
return;
}
spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
/* If the context is aborted then don't schedule it */
if (m2m_ctx->job_flags & TRANS_ABORT) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
dprintk("Aborted context\n");
return;
}
if (m2m_ctx->job_flags & TRANS_QUEUED) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
dprintk("On job queue already\n");
return;
}
spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)
&& !m2m_ctx->out_q_ctx.buffered) {
spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
flags_out);
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
dprintk("No input buffers available\n");
return;
}
spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)
&& !m2m_ctx->cap_q_ctx.buffered) {
spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock,
flags_cap);
spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
flags_out);
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
dprintk("No output buffers available\n");
return;
}
spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
if (m2m_dev->m2m_ops->job_ready
&& (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
dprintk("Driver not ready\n");
return;
}
list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
m2m_ctx->job_flags |= TRANS_QUEUED;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
v4l2_m2m_try_run(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
/**
* v4l2_m2m_cancel_job() - cancel pending jobs for the context
*
* In case of streamoff or release called on any context,
* 1] If the context is currently running, then abort job will be called
* 2] If the context is queued, then the context will be removed from
* the job_queue
*/
static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
{
struct v4l2_m2m_dev *m2m_dev;
unsigned long flags;
m2m_dev = m2m_ctx->m2m_dev;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
m2m_ctx->job_flags |= TRANS_ABORT;
if (m2m_ctx->job_flags & TRANS_RUNNING) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx);
wait_event(m2m_ctx->finished,
!(m2m_ctx->job_flags & TRANS_RUNNING));
} else if (m2m_ctx->job_flags & TRANS_QUEUED) {
list_del(&m2m_ctx->queue);
m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
dprintk("m2m_ctx: %p had been on queue and was removed\n",
m2m_ctx);
} else {
/* Do nothing, was not on queue/running */
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
}
}
/**
* v4l2_m2m_job_finish() - inform the framework that a job has been finished
* and have it clean up
*
* Called by a driver to yield back the device after it has finished with it.
* Should be called as soon as possible after reaching a state which allows
* other instances to take control of the device.
*
* This function has to be called only after device_run() callback has been
* called on the driver. To prevent recursion, it should not be called directly
* from the device_run() callback though.
*/
void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx)
{
unsigned long flags;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
dprintk("Called by an instance not currently running\n");
return;
}
list_del(&m2m_dev->curr_ctx->queue);
m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
wake_up(&m2m_dev->curr_ctx->finished);
m2m_dev->curr_ctx = NULL;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
/* This instance might have more buffers ready, but since we do not
* allow more than one job on the job_queue per instance, each has
* to be scheduled separately after the previous one finishes. */
v4l2_m2m_try_schedule(m2m_ctx);
v4l2_m2m_try_run(m2m_dev);
}
EXPORT_SYMBOL(v4l2_m2m_job_finish);
/**
* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
*/
int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_requestbuffers *reqbufs)
{
struct vb2_queue *vq;
vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
return vb2_reqbufs(vq, reqbufs);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
/**
* v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
*
* See v4l2_m2m_mmap() documentation for details.
*/
int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf)
{
struct vb2_queue *vq;
int ret = 0;
unsigned int i;
vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
ret = vb2_querybuf(vq, buf);
/* Adjust MMAP memory offsets for the CAPTURE queue */
if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
for (i = 0; i < buf->length; ++i)
buf->m.planes[i].m.mem_offset
+= DST_QUEUE_OFF_BASE;
} else {
buf->m.offset += DST_QUEUE_OFF_BASE;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
/**
* v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
* the type
*/
int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf)
{
struct vb2_queue *vq;
int ret;
vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
ret = vb2_qbuf(vq, buf);
if (!ret)
v4l2_m2m_try_schedule(m2m_ctx);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
/**
* v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
* the type
*/
int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf)
{
struct vb2_queue *vq;
vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
/**
* v4l2_m2m_create_bufs() - create a source or destination buffer, depending
* on the type
*/
int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_create_buffers *create)
{
struct vb2_queue *vq;
vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
return vb2_create_bufs(vq, create);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
/**
* v4l2_m2m_expbuf() - export a source or destination buffer, depending on
* the type
*/
int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_exportbuffer *eb)
{
struct vb2_queue *vq;
vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
return vb2_expbuf(vq, eb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
/**
* v4l2_m2m_streamon() - turn on streaming for a video queue
*/
int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
enum v4l2_buf_type type)
{
struct vb2_queue *vq;
int ret;
vq = v4l2_m2m_get_vq(m2m_ctx, type);
ret = vb2_streamon(vq, type);
if (!ret)
v4l2_m2m_try_schedule(m2m_ctx);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
/**
* v4l2_m2m_streamoff() - turn off streaming for a video queue
*/
int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
enum v4l2_buf_type type)
{
struct v4l2_m2m_dev *m2m_dev;
struct v4l2_m2m_queue_ctx *q_ctx;
unsigned long flags_job, flags;
int ret;
/* wait until the current context is dequeued from job_queue */
v4l2_m2m_cancel_job(m2m_ctx);
q_ctx = get_queue_ctx(m2m_ctx, type);
ret = vb2_streamoff(&q_ctx->q, type);
if (ret)
return ret;
m2m_dev = m2m_ctx->m2m_dev;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
/* We should not be scheduled anymore, since we're dropping a queue. */
if (m2m_ctx->job_flags & TRANS_QUEUED)
list_del(&m2m_ctx->queue);
m2m_ctx->job_flags = 0;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
/* Drop queue, since streamoff returns device to the same state as after
* calling reqbufs. */
INIT_LIST_HEAD(&q_ctx->rdy_queue);
q_ctx->num_rdy = 0;
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
if (m2m_dev->curr_ctx == m2m_ctx) {
m2m_dev->curr_ctx = NULL;
wake_up(&m2m_ctx->finished);
}
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
/**
* v4l2_m2m_poll() - poll replacement, for destination buffers only
*
* Call from the driver's poll() function. Will poll both queues. If a buffer
* is available to dequeue (with dqbuf) from the source queue, this will
* indicate that a non-blocking write can be performed, while read will be
* returned in case of the destination queue.
*/
unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct poll_table_struct *wait)
{
struct video_device *vfd = video_devdata(file);
unsigned long req_events = poll_requested_events(wait);
struct vb2_queue *src_q, *dst_q;
struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
unsigned int rc = 0;
unsigned long flags;
if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
struct v4l2_fh *fh = file->private_data;
if (v4l2_event_pending(fh))
rc = POLLPRI;
else if (req_events & POLLPRI)
poll_wait(file, &fh->wait, wait);
if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM)))
return rc;
}
src_q = v4l2_m2m_get_src_vq(m2m_ctx);
dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
/*
* There has to be at least one buffer queued on each queued_list, which
* means either in driver already or waiting for driver to claim it
* and start processing.
*/
if ((!src_q->streaming || list_empty(&src_q->queued_list))
&& (!dst_q->streaming || list_empty(&dst_q->queued_list))) {
rc |= POLLERR;
goto end;
}
if (m2m_ctx->m2m_dev->m2m_ops->unlock)
m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv);
else if (m2m_ctx->q_lock)
mutex_unlock(m2m_ctx->q_lock);
if (list_empty(&src_q->done_list))
poll_wait(file, &src_q->done_wq, wait);
if (list_empty(&dst_q->done_list))
poll_wait(file, &dst_q->done_wq, wait);
if (m2m_ctx->m2m_dev->m2m_ops->lock)
m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv);
else if (m2m_ctx->q_lock) {
if (mutex_lock_interruptible(m2m_ctx->q_lock)) {
rc |= POLLERR;
goto end;
}
}
spin_lock_irqsave(&src_q->done_lock, flags);
if (!list_empty(&src_q->done_list))
src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
done_entry);
if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
|| src_vb->state == VB2_BUF_STATE_ERROR))
rc |= POLLOUT | POLLWRNORM;
spin_unlock_irqrestore(&src_q->done_lock, flags);
spin_lock_irqsave(&dst_q->done_lock, flags);
if (!list_empty(&dst_q->done_list))
dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
done_entry);
if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
|| dst_vb->state == VB2_BUF_STATE_ERROR))
rc |= POLLIN | POLLRDNORM;
spin_unlock_irqrestore(&dst_q->done_lock, flags);
end:
return rc;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
/**
* v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
*
* Call from driver's mmap() function. Will handle mmap() for both queues
* seamlessly for videobuffer, which will receive normal per-queue offsets and
* proper videobuf queue pointers. The differentiation is made outside videobuf
* by adding a predefined offset to buffers from one of the queues and
* subtracting it before passing it back to videobuf. Only drivers (and
* thus applications) receive modified offsets.
*/
int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct vm_area_struct *vma)
{
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
struct vb2_queue *vq;
if (offset < DST_QUEUE_OFF_BASE) {
vq = v4l2_m2m_get_src_vq(m2m_ctx);
} else {
vq = v4l2_m2m_get_dst_vq(m2m_ctx);
vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
}
return vb2_mmap(vq, vma);
}
EXPORT_SYMBOL(v4l2_m2m_mmap);
/**
* v4l2_m2m_init() - initialize per-driver m2m data
*
* Usually called from driver's probe() function.
*/
struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
{
struct v4l2_m2m_dev *m2m_dev;
if (!m2m_ops || WARN_ON(!m2m_ops->device_run) ||
WARN_ON(!m2m_ops->job_abort))
return ERR_PTR(-EINVAL);
m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
if (!m2m_dev)
return ERR_PTR(-ENOMEM);
m2m_dev->curr_ctx = NULL;
m2m_dev->m2m_ops = m2m_ops;
INIT_LIST_HEAD(&m2m_dev->job_queue);
spin_lock_init(&m2m_dev->job_spinlock);
return m2m_dev;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_init);
/**
* v4l2_m2m_release() - cleans up and frees a m2m_dev structure
*
* Usually called from driver's remove() function.
*/
void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
{
kfree(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_release);
/**
* v4l2_m2m_ctx_init() - allocate and initialize a m2m context
* @priv - driver's instance private data
* @m2m_dev - a previously initialized m2m_dev struct
* @vq_init - a callback for queue type-specific initialization function to be
* used for initializing videobuf_queues
*
* Usually called from driver's open() function.
*/
struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
void *drv_priv,
int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
{
struct v4l2_m2m_ctx *m2m_ctx;
struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
int ret;
m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
if (!m2m_ctx)
return ERR_PTR(-ENOMEM);
m2m_ctx->priv = drv_priv;
m2m_ctx->m2m_dev = m2m_dev;
init_waitqueue_head(&m2m_ctx->finished);
out_q_ctx = &m2m_ctx->out_q_ctx;
cap_q_ctx = &m2m_ctx->cap_q_ctx;
INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
spin_lock_init(&out_q_ctx->rdy_spinlock);
spin_lock_init(&cap_q_ctx->rdy_spinlock);
INIT_LIST_HEAD(&m2m_ctx->queue);
ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
if (ret)
goto err;
/*
* If both queues use same mutex assign it as the common buffer
* queues lock to the m2m context. This lock is used in the
* v4l2_m2m_ioctl_* helpers.
*/
if (out_q_ctx->q.lock == cap_q_ctx->q.lock)
m2m_ctx->q_lock = out_q_ctx->q.lock;
return m2m_ctx;
err:
kfree(m2m_ctx);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
/**
* v4l2_m2m_ctx_release() - release m2m context
*
* Usually called from driver's release() function.
*/
void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
{
/* wait until the current context is dequeued from job_queue */
v4l2_m2m_cancel_job(m2m_ctx);
vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
vb2_queue_release(&m2m_ctx->out_q_ctx.q);
kfree(m2m_ctx);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
/**
* v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
*
* Call from buf_queue(), videobuf_queue_ops callback.
*/
void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb)
{
struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb);
struct v4l2_m2m_queue_ctx *q_ctx;
unsigned long flags;
q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type);
if (!q_ctx)
return;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
list_add_tail(&b->list, &q_ctx->rdy_queue);
q_ctx->num_rdy++;
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
/* Videobuf2 ioctl helpers */
int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
struct v4l2_requestbuffers *rb)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
struct v4l2_create_buffers *create)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
struct v4l2_buffer *buf)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
struct v4l2_buffer *buf)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
struct v4l2_buffer *buf)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
struct v4l2_exportbuffer *eb)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
enum v4l2_buf_type type)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
enum v4l2_buf_type type)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
/*
* v4l2_file_operations helpers. It is assumed here same lock is used
* for the output and the capture buffer queue.
*/
int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
{
struct v4l2_fh *fh = file->private_data;
struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
int ret;
if (m2m_ctx->q_lock && mutex_lock_interruptible(m2m_ctx->q_lock))
return -ERESTARTSYS;
ret = v4l2_m2m_mmap(file, m2m_ctx, vma);
if (m2m_ctx->q_lock)
mutex_unlock(m2m_ctx->q_lock);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
{
struct v4l2_fh *fh = file->private_data;
struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
unsigned int ret;
if (m2m_ctx->q_lock)
mutex_lock(m2m_ctx->q_lock);
ret = v4l2_m2m_poll(file, m2m_ctx, wait);
if (m2m_ctx->q_lock)
mutex_unlock(m2m_ctx->q_lock);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);