linux/drivers/media/v4l2-core/v4l2-mem2mem.c
Alexandre Courbot 726daf6baf media: v4l2-mem2mem: always call poll_wait() on queues
do_poll()/do_select() seem to set the _qproc member of poll_table to
NULL the first time they are called on a given table, making subsequent
calls of poll_wait() on that table no-ops. This is a problem for mem2mem
which calls poll_wait() on the V4L2 queues' waitqueues only when a
queue-related event is requested, which may not necessarily be the case
during the first poll.

For instance, a stateful decoder is typically only interested in
EPOLLPRI events when it starts, and will switch to listening to both
EPOLLPRI and EPOLLIN after receiving the initial resolution change event
and configuring the CAPTURE queue. However by the time that switch
happens and v4l2_m2m_poll_for_data() is called for the first time,
poll_wait() has become a no-op and the V4L2 queues waitqueues thus
cannot be registered.

Fix this by moving the registration to v4l2_m2m_poll() and do it whether
or not one of the queue-related events are requested.

Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2021-01-04 13:13:15 +01:00

1569 lines
42 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <media/media-device.h>
#include <media/videobuf2-v4l2.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.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)
/* The job queue is not running new jobs */
#define QUEUE_PAUSED (1 << 0)
/* 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)
enum v4l2_m2m_entity_type {
MEM2MEM_ENT_TYPE_SOURCE,
MEM2MEM_ENT_TYPE_SINK,
MEM2MEM_ENT_TYPE_PROC
};
static const char * const m2m_entity_name[] = {
"source",
"sink",
"proc"
};
/**
* struct v4l2_m2m_dev - per-device context
* @source: &struct media_entity pointer with the source entity
* Used only when the M2M device is registered via
* v4l2_m2m_unregister_media_controller().
* @source_pad: &struct media_pad with the source pad.
* Used only when the M2M device is registered via
* v4l2_m2m_unregister_media_controller().
* @sink: &struct media_entity pointer with the sink entity
* Used only when the M2M device is registered via
* v4l2_m2m_unregister_media_controller().
* @sink_pad: &struct media_pad with the sink pad.
* Used only when the M2M device is registered via
* v4l2_m2m_unregister_media_controller().
* @proc: &struct media_entity pointer with the M2M device itself.
* @proc_pads: &struct media_pad with the @proc pads.
* Used only when the M2M device is registered via
* v4l2_m2m_unregister_media_controller().
* @intf_devnode: &struct media_intf devnode pointer with the interface
* with controls the M2M device.
* @curr_ctx: currently running instance
* @job_queue: instances queued to run
* @job_spinlock: protects job_queue
* @job_work: worker to run queued jobs.
* @job_queue_flags: flags of the queue status, %QUEUE_PAUSED.
* @m2m_ops: driver callbacks
*/
struct v4l2_m2m_dev {
struct v4l2_m2m_ctx *curr_ctx;
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_entity *source;
struct media_pad source_pad;
struct media_entity sink;
struct media_pad sink_pad;
struct media_entity proc;
struct media_pad proc_pads[2];
struct media_intf_devnode *intf_devnode;
#endif
struct list_head job_queue;
spinlock_t job_spinlock;
struct work_struct job_work;
unsigned long job_queue_flags;
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;
}
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);
struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b;
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);
struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b;
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_last_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_last_buf);
struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b;
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);
void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
struct vb2_v4l2_buffer *vbuf)
{
struct v4l2_m2m_buffer *b;
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
list_del(&b->list);
q_ctx->num_rdy--;
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);
struct vb2_v4l2_buffer *
v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
{
struct v4l2_m2m_buffer *b, *tmp;
struct vb2_v4l2_buffer *ret = NULL;
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
if (b->vb.vb2_buf.index == idx) {
list_del(&b->list);
q_ctx->num_rdy--;
ret = &b->vb;
break;
}
}
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
/*
* Scheduling handlers
*/
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
* @m2m_dev: per-device context
*
* Get next transaction (if present) from the waiting jobs list and run it.
*
* Note that this function can run on a given v4l2_m2m_ctx context,
* but call .device_run for another context.
*/
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;
}
if (m2m_dev->job_queue_flags & QUEUE_PAUSED) {
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
dprintk("Running new jobs is paused\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);
dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
}
/*
* __v4l2_m2m_try_queue() - queue a job
* @m2m_dev: m2m device
* @m2m_ctx: m2m context
*
* Check if this context is ready to queue a job.
*
* This function can run in interrupt context.
*/
static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx)
{
unsigned long flags_job;
struct vb2_v4l2_buffer *dst, *src;
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) {
dprintk("Aborted context\n");
goto job_unlock;
}
if (m2m_ctx->job_flags & TRANS_QUEUED) {
dprintk("On job queue already\n");
goto job_unlock;
}
src = v4l2_m2m_next_src_buf(m2m_ctx);
dst = v4l2_m2m_next_dst_buf(m2m_ctx);
if (!src && !m2m_ctx->out_q_ctx.buffered) {
dprintk("No input buffers available\n");
goto job_unlock;
}
if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
dprintk("No output buffers available\n");
goto job_unlock;
}
m2m_ctx->new_frame = true;
if (src && dst && dst->is_held &&
dst->vb2_buf.copied_timestamp &&
dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
dst->is_held = false;
v4l2_m2m_dst_buf_remove(m2m_ctx);
v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
dst = v4l2_m2m_next_dst_buf(m2m_ctx);
if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
dprintk("No output buffers available after returning held buffer\n");
goto job_unlock;
}
}
if (src && dst && (m2m_ctx->out_q_ctx.q.subsystem_flags &
VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
m2m_ctx->new_frame = !dst->vb2_buf.copied_timestamp ||
dst->vb2_buf.timestamp != src->vb2_buf.timestamp;
if (m2m_ctx->has_stopped) {
dprintk("Device has stopped\n");
goto job_unlock;
}
if (m2m_dev->m2m_ops->job_ready
&& (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
dprintk("Driver not ready\n");
goto job_unlock;
}
list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
m2m_ctx->job_flags |= TRANS_QUEUED;
job_unlock:
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
}
/**
* v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
* @m2m_ctx: m2m context
*
* Check if this context is ready to queue a job. If suitable,
* run the next queued job on the mem2mem device.
*
* This function shouldn't run in interrupt context.
*
* Note that v4l2_m2m_try_schedule() can schedule one job for this context,
* and then run another job for another context.
*/
void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
{
struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
__v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
v4l2_m2m_try_run(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
/**
* v4l2_m2m_device_run_work() - run pending jobs for the context
* @work: Work structure used for scheduling the execution of this function.
*/
static void v4l2_m2m_device_run_work(struct work_struct *work)
{
struct v4l2_m2m_dev *m2m_dev =
container_of(work, struct v4l2_m2m_dev, job_work);
v4l2_m2m_try_run(m2m_dev);
}
/**
* v4l2_m2m_cancel_job() - cancel pending jobs for the context
* @m2m_ctx: m2m context with jobs to be canceled
*
* 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);
if (m2m_dev->m2m_ops->job_abort)
m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
dprintk("m2m_ctx %p running, will wait to complete\n", 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);
}
}
/*
* Schedule the next job, called from v4l2_m2m_job_finish() or
* v4l2_m2m_buf_done_and_job_finish().
*/
static void v4l2_m2m_schedule_next_job(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx)
{
/*
* 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_queue(m2m_dev, m2m_ctx);
/*
* We might be running in atomic context,
* but the job must be run in non-atomic context.
*/
schedule_work(&m2m_dev->job_work);
}
/*
* Assumes job_spinlock is held, called from v4l2_m2m_job_finish() or
* v4l2_m2m_buf_done_and_job_finish().
*/
static bool _v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx)
{
if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
dprintk("Called by an instance not currently running\n");
return false;
}
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;
return true;
}
void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx)
{
unsigned long flags;
bool schedule_next;
/*
* This function should not be used for drivers that support
* holding capture buffers. Those should use
* v4l2_m2m_buf_done_and_job_finish() instead.
*/
WARN_ON(m2m_ctx->out_q_ctx.q.subsystem_flags &
VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF);
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
if (schedule_next)
v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
}
EXPORT_SYMBOL(v4l2_m2m_job_finish);
void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx,
enum vb2_buffer_state state)
{
struct vb2_v4l2_buffer *src_buf, *dst_buf;
bool schedule_next = false;
unsigned long flags;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
src_buf = v4l2_m2m_src_buf_remove(m2m_ctx);
dst_buf = v4l2_m2m_next_dst_buf(m2m_ctx);
if (WARN_ON(!src_buf || !dst_buf))
goto unlock;
dst_buf->is_held = src_buf->flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
if (!dst_buf->is_held) {
v4l2_m2m_dst_buf_remove(m2m_ctx);
v4l2_m2m_buf_done(dst_buf, state);
}
/*
* If the request API is being used, returning the OUTPUT
* (src) buffer will wake-up any process waiting on the
* request file descriptor.
*
* Therefore, return the CAPTURE (dst) buffer first,
* to avoid signalling the request file descriptor
* before the CAPTURE buffer is done.
*/
v4l2_m2m_buf_done(src_buf, state);
schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
unlock:
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
if (schedule_next)
v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
}
EXPORT_SYMBOL(v4l2_m2m_buf_done_and_job_finish);
void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev)
{
unsigned long flags;
struct v4l2_m2m_ctx *curr_ctx;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
m2m_dev->job_queue_flags |= QUEUE_PAUSED;
curr_ctx = m2m_dev->curr_ctx;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
if (curr_ctx)
wait_event(curr_ctx->finished,
!(curr_ctx->job_flags & TRANS_RUNNING));
}
EXPORT_SYMBOL(v4l2_m2m_suspend);
void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev)
{
unsigned long flags;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
m2m_dev->job_queue_flags &= ~QUEUE_PAUSED;
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
v4l2_m2m_try_run(m2m_dev);
}
EXPORT_SYMBOL(v4l2_m2m_resume);
int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_requestbuffers *reqbufs)
{
struct vb2_queue *vq;
int ret;
vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
ret = vb2_reqbufs(vq, reqbufs);
/* If count == 0, then the owner has released all buffers and he
is no longer owner of the queue. Otherwise we have an owner. */
if (ret == 0)
vq->owner = reqbufs->count ? file->private_data : NULL;
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
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_CAPTURE(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);
/*
* This will add the LAST flag and mark the buffer management
* state as stopped.
* This is called when the last capture buffer must be flagged as LAST
* in draining mode from the encoder/decoder driver buf_queue() callback
* or from v4l2_update_last_buf_state() when a capture buffer is available.
*/
void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_v4l2_buffer *vbuf)
{
vbuf->flags |= V4L2_BUF_FLAG_LAST;
vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
v4l2_m2m_mark_stopped(m2m_ctx);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_last_buffer_done);
/* When stop command is issued, update buffer management state */
static int v4l2_update_last_buf_state(struct v4l2_m2m_ctx *m2m_ctx)
{
struct vb2_v4l2_buffer *next_dst_buf;
if (m2m_ctx->is_draining)
return -EBUSY;
if (m2m_ctx->has_stopped)
return 0;
m2m_ctx->last_src_buf = v4l2_m2m_last_src_buf(m2m_ctx);
m2m_ctx->is_draining = true;
/*
* The processing of the last output buffer queued before
* the STOP command is expected to mark the buffer management
* state as stopped with v4l2_m2m_mark_stopped().
*/
if (m2m_ctx->last_src_buf)
return 0;
/*
* In case the output queue is empty, try to mark the last capture
* buffer as LAST.
*/
next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
if (!next_dst_buf) {
/*
* Wait for the next queued one in encoder/decoder driver
* buf_queue() callback using the v4l2_m2m_dst_buf_is_last()
* helper or in v4l2_m2m_qbuf() if encoder/decoder is not yet
* streaming.
*/
m2m_ctx->next_buf_last = true;
return 0;
}
v4l2_m2m_last_buffer_done(m2m_ctx, next_dst_buf);
return 0;
}
/*
* Updates the encoding/decoding buffer management state, should
* be called from encoder/decoder drivers start_streaming()
*/
void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_queue *q)
{
/* If start streaming again, untag the last output buffer */
if (V4L2_TYPE_IS_OUTPUT(q->type))
m2m_ctx->last_src_buf = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_update_start_streaming_state);
/*
* Updates the encoding/decoding buffer management state, should
* be called from encoder/decoder driver stop_streaming()
*/
void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_queue *q)
{
if (V4L2_TYPE_IS_OUTPUT(q->type)) {
/*
* If in draining state, either mark next dst buffer as
* done or flag next one to be marked as done either
* in encoder/decoder driver buf_queue() callback using
* the v4l2_m2m_dst_buf_is_last() helper or in v4l2_m2m_qbuf()
* if encoder/decoder is not yet streaming
*/
if (m2m_ctx->is_draining) {
struct vb2_v4l2_buffer *next_dst_buf;
m2m_ctx->last_src_buf = NULL;
next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
if (!next_dst_buf)
m2m_ctx->next_buf_last = true;
else
v4l2_m2m_last_buffer_done(m2m_ctx,
next_dst_buf);
}
} else {
v4l2_m2m_clear_state(m2m_ctx);
}
}
EXPORT_SYMBOL_GPL(v4l2_m2m_update_stop_streaming_state);
static void v4l2_m2m_force_last_buf_done(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_queue *q)
{
struct vb2_buffer *vb;
struct vb2_v4l2_buffer *vbuf;
unsigned int i;
if (WARN_ON(q->is_output))
return;
if (list_empty(&q->queued_list))
return;
vb = list_first_entry(&q->queued_list, struct vb2_buffer, queued_entry);
for (i = 0; i < vb->num_planes; i++)
vb2_set_plane_payload(vb, i, 0);
/*
* Since the buffer hasn't been queued to the ready queue,
* mark is active and owned before marking it LAST and DONE
*/
vb->state = VB2_BUF_STATE_ACTIVE;
atomic_inc(&q->owned_by_drv_count);
vbuf = to_vb2_v4l2_buffer(vb);
vbuf->field = V4L2_FIELD_NONE;
v4l2_m2m_last_buffer_done(m2m_ctx, vbuf);
}
int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf)
{
struct video_device *vdev = video_devdata(file);
struct vb2_queue *vq;
int ret;
vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
(buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
dprintk("%s: requests cannot be used with capture buffers\n",
__func__);
return -EPERM;
}
ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
if (ret)
return ret;
/*
* If the capture queue is streaming, but streaming hasn't started
* on the device, but was asked to stop, mark the previously queued
* buffer as DONE with LAST flag since it won't be queued on the
* device.
*/
if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
vb2_is_streaming(vq) && !vb2_start_streaming_called(vq) &&
(v4l2_m2m_has_stopped(m2m_ctx) || v4l2_m2m_dst_buf_is_last(m2m_ctx)))
v4l2_m2m_force_last_buf_done(m2m_ctx, vq);
else if (!(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
v4l2_m2m_try_schedule(m2m_ctx);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
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);
int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf)
{
struct video_device *vdev = video_devdata(file);
struct vb2_queue *vq;
vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
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);
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);
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);
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);
static __poll_t v4l2_m2m_poll_for_data(struct file *file,
struct v4l2_m2m_ctx *m2m_ctx,
struct poll_table_struct *wait)
{
struct vb2_queue *src_q, *dst_q;
__poll_t rc = 0;
unsigned long flags;
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 || src_q->error ||
list_empty(&src_q->queued_list)) &&
(!dst_q->streaming || dst_q->error ||
list_empty(&dst_q->queued_list)))
return EPOLLERR;
spin_lock_irqsave(&src_q->done_lock, flags);
if (!list_empty(&src_q->done_list))
rc |= EPOLLOUT | EPOLLWRNORM;
spin_unlock_irqrestore(&src_q->done_lock, flags);
spin_lock_irqsave(&dst_q->done_lock, flags);
/*
* If the last buffer was dequeued from the capture queue, signal
* userspace. DQBUF(CAPTURE) will return -EPIPE.
*/
if (!list_empty(&dst_q->done_list) || dst_q->last_buffer_dequeued)
rc |= EPOLLIN | EPOLLRDNORM;
spin_unlock_irqrestore(&dst_q->done_lock, flags);
return rc;
}
__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct poll_table_struct *wait)
{
struct video_device *vfd = video_devdata(file);
struct vb2_queue *src_q = v4l2_m2m_get_src_vq(m2m_ctx);
struct vb2_queue *dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
__poll_t req_events = poll_requested_events(wait);
__poll_t rc = 0;
/*
* poll_wait() MUST be called on the first invocation on all the
* potential queues of interest, even if we are not interested in their
* events during this first call. Failure to do so will result in
* queue's events to be ignored because the poll_table won't be capable
* of adding new wait queues thereafter.
*/
poll_wait(file, &src_q->done_wq, wait);
poll_wait(file, &dst_q->done_wq, wait);
if (req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM))
rc = v4l2_m2m_poll_for_data(file, m2m_ctx, wait);
if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
struct v4l2_fh *fh = file->private_data;
poll_wait(file, &fh->wait, wait);
if (v4l2_event_pending(fh))
rc |= EPOLLPRI;
}
return rc;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
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);
#if defined(CONFIG_MEDIA_CONTROLLER)
void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
{
media_remove_intf_links(&m2m_dev->intf_devnode->intf);
media_devnode_remove(m2m_dev->intf_devnode);
media_entity_remove_links(m2m_dev->source);
media_entity_remove_links(&m2m_dev->sink);
media_entity_remove_links(&m2m_dev->proc);
media_device_unregister_entity(m2m_dev->source);
media_device_unregister_entity(&m2m_dev->sink);
media_device_unregister_entity(&m2m_dev->proc);
kfree(m2m_dev->source->name);
kfree(m2m_dev->sink.name);
kfree(m2m_dev->proc.name);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
static int v4l2_m2m_register_entity(struct media_device *mdev,
struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
struct video_device *vdev, int function)
{
struct media_entity *entity;
struct media_pad *pads;
char *name;
unsigned int len;
int num_pads;
int ret;
switch (type) {
case MEM2MEM_ENT_TYPE_SOURCE:
entity = m2m_dev->source;
pads = &m2m_dev->source_pad;
pads[0].flags = MEDIA_PAD_FL_SOURCE;
num_pads = 1;
break;
case MEM2MEM_ENT_TYPE_SINK:
entity = &m2m_dev->sink;
pads = &m2m_dev->sink_pad;
pads[0].flags = MEDIA_PAD_FL_SINK;
num_pads = 1;
break;
case MEM2MEM_ENT_TYPE_PROC:
entity = &m2m_dev->proc;
pads = m2m_dev->proc_pads;
pads[0].flags = MEDIA_PAD_FL_SINK;
pads[1].flags = MEDIA_PAD_FL_SOURCE;
num_pads = 2;
break;
default:
return -EINVAL;
}
entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
if (type != MEM2MEM_ENT_TYPE_PROC) {
entity->info.dev.major = VIDEO_MAJOR;
entity->info.dev.minor = vdev->minor;
}
len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
name = kmalloc(len, GFP_KERNEL);
if (!name)
return -ENOMEM;
snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
entity->name = name;
entity->function = function;
ret = media_entity_pads_init(entity, num_pads, pads);
if (ret)
return ret;
ret = media_device_register_entity(mdev, entity);
if (ret)
return ret;
return 0;
}
int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
struct video_device *vdev, int function)
{
struct media_device *mdev = vdev->v4l2_dev->mdev;
struct media_link *link;
int ret;
if (!mdev)
return 0;
/* A memory-to-memory device consists in two
* DMA engine and one video processing entities.
* The DMA engine entities are linked to a V4L interface
*/
/* Create the three entities with their pads */
m2m_dev->source = &vdev->entity;
ret = v4l2_m2m_register_entity(mdev, m2m_dev,
MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
if (ret)
return ret;
ret = v4l2_m2m_register_entity(mdev, m2m_dev,
MEM2MEM_ENT_TYPE_PROC, vdev, function);
if (ret)
goto err_rel_entity0;
ret = v4l2_m2m_register_entity(mdev, m2m_dev,
MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
if (ret)
goto err_rel_entity1;
/* Connect the three entities */
ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 0,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret)
goto err_rel_entity2;
ret = media_create_pad_link(&m2m_dev->proc, 1, &m2m_dev->sink, 0,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret)
goto err_rm_links0;
/* Create video interface */
m2m_dev->intf_devnode = media_devnode_create(mdev,
MEDIA_INTF_T_V4L_VIDEO, 0,
VIDEO_MAJOR, vdev->minor);
if (!m2m_dev->intf_devnode) {
ret = -ENOMEM;
goto err_rm_links1;
}
/* Connect the two DMA engines to the interface */
link = media_create_intf_link(m2m_dev->source,
&m2m_dev->intf_devnode->intf,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (!link) {
ret = -ENOMEM;
goto err_rm_devnode;
}
link = media_create_intf_link(&m2m_dev->sink,
&m2m_dev->intf_devnode->intf,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (!link) {
ret = -ENOMEM;
goto err_rm_intf_link;
}
return 0;
err_rm_intf_link:
media_remove_intf_links(&m2m_dev->intf_devnode->intf);
err_rm_devnode:
media_devnode_remove(m2m_dev->intf_devnode);
err_rm_links1:
media_entity_remove_links(&m2m_dev->sink);
err_rm_links0:
media_entity_remove_links(&m2m_dev->proc);
media_entity_remove_links(m2m_dev->source);
err_rel_entity2:
media_device_unregister_entity(&m2m_dev->proc);
kfree(m2m_dev->proc.name);
err_rel_entity1:
media_device_unregister_entity(&m2m_dev->sink);
kfree(m2m_dev->sink.name);
err_rel_entity0:
media_device_unregister_entity(m2m_dev->source);
kfree(m2m_dev->source->name);
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
#endif
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))
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);
INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);
return m2m_dev;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_init);
void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
{
kfree(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_release);
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;
/*
* Both queues should use same the mutex to lock the m2m context.
* This lock is used in some v4l2_m2m_* helpers.
*/
if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
ret = -EINVAL;
goto err;
}
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);
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);
void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_v4l2_buffer *vbuf)
{
struct v4l2_m2m_buffer *b = container_of(vbuf,
struct v4l2_m2m_buffer, vb);
struct v4l2_m2m_queue_ctx *q_ctx;
unsigned long flags;
q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.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);
void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
struct vb2_v4l2_buffer *cap_vb,
bool copy_frame_flags)
{
u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
if (copy_frame_flags)
mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
V4L2_BUF_FLAG_BFRAME;
cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;
if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
cap_vb->timecode = out_vb->timecode;
cap_vb->field = out_vb->field;
cap_vb->flags &= ~mask;
cap_vb->flags |= out_vb->flags & mask;
cap_vb->vb2_buf.copied_timestamp = 1;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);
void v4l2_m2m_request_queue(struct media_request *req)
{
struct media_request_object *obj, *obj_safe;
struct v4l2_m2m_ctx *m2m_ctx = NULL;
/*
* Queue all objects. Note that buffer objects are at the end of the
* objects list, after all other object types. Once buffer objects
* are queued, the driver might delete them immediately (if the driver
* processes the buffer at once), so we have to use
* list_for_each_entry_safe() to handle the case where the object we
* queue is deleted.
*/
list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
struct v4l2_m2m_ctx *m2m_ctx_obj;
struct vb2_buffer *vb;
if (!obj->ops->queue)
continue;
if (vb2_request_object_is_buffer(obj)) {
/* Sanity checks */
vb = container_of(obj, struct vb2_buffer, req_obj);
WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
m2m_ctx_obj = container_of(vb->vb2_queue,
struct v4l2_m2m_ctx,
out_q_ctx.q);
WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
m2m_ctx = m2m_ctx_obj;
}
/*
* The buffer we queue here can in theory be immediately
* unbound, hence the use of list_for_each_entry_safe()
* above and why we call the queue op last.
*/
obj->ops->queue(obj);
}
WARN_ON(!m2m_ctx);
if (m2m_ctx)
v4l2_m2m_try_schedule(m2m_ctx);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_request_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_prepare_buf(struct file *file, void *priv,
struct v4l2_buffer *buf)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
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);
int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
struct v4l2_encoder_cmd *ec)
{
if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
return -EINVAL;
ec->flags = 0;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
struct v4l2_decoder_cmd *dc)
{
if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
return -EINVAL;
dc->flags = 0;
if (dc->cmd == V4L2_DEC_CMD_STOP) {
dc->stop.pts = 0;
} else if (dc->cmd == V4L2_DEC_CMD_START) {
dc->start.speed = 0;
dc->start.format = V4L2_DEC_START_FMT_NONE;
}
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
/*
* Updates the encoding state on ENC_CMD_STOP/ENC_CMD_START
* Should be called from the encoder driver encoder_cmd() callback
*/
int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_encoder_cmd *ec)
{
if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
return -EINVAL;
if (ec->cmd == V4L2_ENC_CMD_STOP)
return v4l2_update_last_buf_state(m2m_ctx);
if (m2m_ctx->is_draining)
return -EBUSY;
if (m2m_ctx->has_stopped)
m2m_ctx->has_stopped = false;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_encoder_cmd);
/*
* Updates the decoding state on DEC_CMD_STOP/DEC_CMD_START
* Should be called from the decoder driver decoder_cmd() callback
*/
int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_decoder_cmd *dc)
{
if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
return -EINVAL;
if (dc->cmd == V4L2_DEC_CMD_STOP)
return v4l2_update_last_buf_state(m2m_ctx);
if (m2m_ctx->is_draining)
return -EBUSY;
if (m2m_ctx->has_stopped)
m2m_ctx->has_stopped = false;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_decoder_cmd);
int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *priv,
struct v4l2_encoder_cmd *ec)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_encoder_cmd(file, fh->m2m_ctx, ec);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_encoder_cmd);
int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *priv,
struct v4l2_decoder_cmd *dc)
{
struct v4l2_fh *fh = file->private_data;
return v4l2_m2m_decoder_cmd(file, fh->m2m_ctx, dc);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_decoder_cmd);
int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
struct v4l2_decoder_cmd *dc)
{
if (dc->cmd != V4L2_DEC_CMD_FLUSH)
return -EINVAL;
dc->flags = 0;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_try_decoder_cmd);
int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
struct v4l2_decoder_cmd *dc)
{
struct v4l2_fh *fh = file->private_data;
struct vb2_v4l2_buffer *out_vb, *cap_vb;
struct v4l2_m2m_dev *m2m_dev = fh->m2m_ctx->m2m_dev;
unsigned long flags;
int ret;
ret = v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, dc);
if (ret < 0)
return ret;
spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
out_vb = v4l2_m2m_last_src_buf(fh->m2m_ctx);
cap_vb = v4l2_m2m_last_dst_buf(fh->m2m_ctx);
/*
* If there is an out buffer pending, then clear any HOLD flag.
*
* By clearing this flag we ensure that when this output
* buffer is processed any held capture buffer will be released.
*/
if (out_vb) {
out_vb->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
} else if (cap_vb && cap_vb->is_held) {
/*
* If there were no output buffers, but there is a
* capture buffer that is held, then release that
* buffer.
*/
cap_vb->is_held = false;
v4l2_m2m_dst_buf_remove(fh->m2m_ctx);
v4l2_m2m_buf_done(cap_vb, VB2_BUF_STATE_DONE);
}
spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_decoder_cmd);
/*
* 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;
return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
__poll_t 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;
__poll_t 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);