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media: v4l2-mem2mem: add v4l2_m2m_suspend, v4l2_m2m_resume

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Add two functions that can be used to stop new jobs from being queued /
continue running queued job. This can be used while a driver using m2m
helper is going to suspend / wake up from resume, and can ensure that
there's no job running in suspend process.

Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Signed-off-by: Jerry-ch Chen <jerry-ch.chen@mediatek.corp-partner.google.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Pi-Hsun Shih 2020-08-14 09:11:40 +02:00 committed by Mauro Carvalho Chehab
parent 1847f68e39
commit 911ea8ec42
2 changed files with 63 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

41
drivers/media/v4l2-core/v4l2-mem2mem.c
View file

@ -43,6 +43,10 @@ module_param(debug, bool, 0644);
#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 */
@ -84,6 +88,7 @@ static const char * const m2m_entity_name[] = {
* @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 {
@ -101,6 +106,7 @@ struct v4l2_m2m_dev {
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;
};
@ -263,6 +269,12 @@ static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
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;
@ -504,6 +516,7 @@ void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
if (WARN_ON(!src_buf || !dst_buf))
goto unlock;
v4l2_m2m_buf_done(src_buf, state);
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);
@ -528,6 +541,34 @@ void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
}
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)
{

22
include/media/v4l2-mem2mem.h
View file

@ -304,6 +304,28 @@ v4l2_m2m_is_last_draining_src_buf(struct v4l2_m2m_ctx *m2m_ctx,
void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_v4l2_buffer *vbuf);
/**
* v4l2_m2m_suspend() - stop new jobs from being run and wait for current job
* to finish
*
* @m2m_dev: opaque pointer to the internal data to handle M2M context
*
* Called by a driver in the suspend hook. Stop new jobs from being run, and
* wait for current running job to finish.
*/
void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev);
/**
* v4l2_m2m_resume() - resume job running and try to run a queued job
*
* @m2m_dev: opaque pointer to the internal data to handle M2M context
*
* Called by a driver in the resume hook. This reverts the operation of
* v4l2_m2m_suspend() and allows job to be run. Also try to run a queued job if
* there is any.
*/
void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev);
/**
* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
*