![Philipp Zabel](/assets/img/avatar_default.png)
The first time b is used, it is assigned to the first element of the rdy_queue list. There is no need to set it to NULL before. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Kamil Debski <k.debski@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
874 lines
24 KiB
C
874 lines
24 KiB
C
/*
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* Memory-to-memory device framework for Video for Linux 2 and videobuf.
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*
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* Helper functions for devices that use videobuf buffers for both their
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* source and destination.
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*
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* Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
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* Pawel Osciak, <pawel@osciak.com>
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* Marek Szyprowski, <m.szyprowski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <media/videobuf2-core.h>
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#include <media/v4l2-mem2mem.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
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MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
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MODULE_LICENSE("GPL");
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static bool debug;
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module_param(debug, bool, 0644);
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#define dprintk(fmt, arg...) \
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do { \
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if (debug) \
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printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
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} while (0)
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/* Instance is already queued on the job_queue */
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#define TRANS_QUEUED (1 << 0)
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/* Instance is currently running in hardware */
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#define TRANS_RUNNING (1 << 1)
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/* Instance is currently aborting */
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#define TRANS_ABORT (1 << 2)
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/* Offset base for buffers on the destination queue - used to distinguish
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* between source and destination buffers when mmapping - they receive the same
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* offsets but for different queues */
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#define DST_QUEUE_OFF_BASE (1 << 30)
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/**
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* struct v4l2_m2m_dev - per-device context
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* @curr_ctx: currently running instance
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* @job_queue: instances queued to run
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* @job_spinlock: protects job_queue
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* @m2m_ops: driver callbacks
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*/
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struct v4l2_m2m_dev {
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struct v4l2_m2m_ctx *curr_ctx;
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struct list_head job_queue;
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spinlock_t job_spinlock;
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const struct v4l2_m2m_ops *m2m_ops;
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};
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static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type)
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{
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if (V4L2_TYPE_IS_OUTPUT(type))
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return &m2m_ctx->out_q_ctx;
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else
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return &m2m_ctx->cap_q_ctx;
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}
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/**
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* v4l2_m2m_get_vq() - return vb2_queue for the given type
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*/
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struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type)
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{
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struct v4l2_m2m_queue_ctx *q_ctx;
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q_ctx = get_queue_ctx(m2m_ctx, type);
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if (!q_ctx)
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return NULL;
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return &q_ctx->q;
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}
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EXPORT_SYMBOL(v4l2_m2m_get_vq);
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/**
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* v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
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*/
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void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
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{
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struct v4l2_m2m_buffer *b;
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unsigned long flags;
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spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
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if (list_empty(&q_ctx->rdy_queue)) {
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spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
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return NULL;
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}
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b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
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spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
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return &b->vb;
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
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/**
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* v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
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* return it
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*/
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void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
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{
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struct v4l2_m2m_buffer *b;
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unsigned long flags;
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spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
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if (list_empty(&q_ctx->rdy_queue)) {
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spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
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return NULL;
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}
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b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
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list_del(&b->list);
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q_ctx->num_rdy--;
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spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
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return &b->vb;
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
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/*
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* Scheduling handlers
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*/
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/**
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* v4l2_m2m_get_curr_priv() - return driver private data for the currently
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* running instance or NULL if no instance is running
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*/
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void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
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{
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unsigned long flags;
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void *ret = NULL;
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spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
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if (m2m_dev->curr_ctx)
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ret = m2m_dev->curr_ctx->priv;
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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return ret;
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}
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EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
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/**
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* v4l2_m2m_try_run() - select next job to perform and run it if possible
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*
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* Get next transaction (if present) from the waiting jobs list and run it.
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*/
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static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
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if (NULL != m2m_dev->curr_ctx) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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dprintk("Another instance is running, won't run now\n");
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return;
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}
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if (list_empty(&m2m_dev->job_queue)) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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dprintk("No job pending\n");
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return;
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}
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m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
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struct v4l2_m2m_ctx, queue);
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m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
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}
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/**
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* v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
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* the pending job queue and add it if so.
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* @m2m_ctx: m2m context assigned to the instance to be checked
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*
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* There are three basic requirements an instance has to meet to be able to run:
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* 1) at least one source buffer has to be queued,
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* 2) at least one destination buffer has to be queued,
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* 3) streaming has to be on.
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*
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* If a queue is buffered (for example a decoder hardware ringbuffer that has
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* to be drained before doing streamoff), allow scheduling without v4l2 buffers
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* on that queue.
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*
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* There may also be additional, custom requirements. In such case the driver
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* should supply a custom callback (job_ready in v4l2_m2m_ops) that should
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* return 1 if the instance is ready.
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* An example of the above could be an instance that requires more than one
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* src/dst buffer per transaction.
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*/
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void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
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{
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struct v4l2_m2m_dev *m2m_dev;
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unsigned long flags_job, flags_out, flags_cap;
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m2m_dev = m2m_ctx->m2m_dev;
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dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
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if (!m2m_ctx->out_q_ctx.q.streaming
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|| !m2m_ctx->cap_q_ctx.q.streaming) {
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dprintk("Streaming needs to be on for both queues\n");
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return;
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}
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spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
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/* If the context is aborted then don't schedule it */
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if (m2m_ctx->job_flags & TRANS_ABORT) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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dprintk("Aborted context\n");
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return;
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}
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if (m2m_ctx->job_flags & TRANS_QUEUED) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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dprintk("On job queue already\n");
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return;
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}
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spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
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if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)
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&& !m2m_ctx->out_q_ctx.buffered) {
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spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
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flags_out);
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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dprintk("No input buffers available\n");
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return;
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}
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spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
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if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)
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&& !m2m_ctx->cap_q_ctx.buffered) {
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spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock,
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flags_cap);
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spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
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flags_out);
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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dprintk("No output buffers available\n");
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return;
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}
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spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
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spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
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if (m2m_dev->m2m_ops->job_ready
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&& (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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dprintk("Driver not ready\n");
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return;
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}
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list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
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m2m_ctx->job_flags |= TRANS_QUEUED;
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
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v4l2_m2m_try_run(m2m_dev);
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
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/**
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* v4l2_m2m_cancel_job() - cancel pending jobs for the context
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*
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* In case of streamoff or release called on any context,
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* 1] If the context is currently running, then abort job will be called
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* 2] If the context is queued, then the context will be removed from
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* the job_queue
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*/
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static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
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{
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struct v4l2_m2m_dev *m2m_dev;
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unsigned long flags;
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m2m_dev = m2m_ctx->m2m_dev;
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spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
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m2m_ctx->job_flags |= TRANS_ABORT;
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if (m2m_ctx->job_flags & TRANS_RUNNING) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
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dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx);
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wait_event(m2m_ctx->finished,
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!(m2m_ctx->job_flags & TRANS_RUNNING));
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} else if (m2m_ctx->job_flags & TRANS_QUEUED) {
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list_del(&m2m_ctx->queue);
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m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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dprintk("m2m_ctx: %p had been on queue and was removed\n",
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m2m_ctx);
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} else {
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/* Do nothing, was not on queue/running */
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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}
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}
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/**
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* v4l2_m2m_job_finish() - inform the framework that a job has been finished
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* and have it clean up
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*
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* Called by a driver to yield back the device after it has finished with it.
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* Should be called as soon as possible after reaching a state which allows
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* other instances to take control of the device.
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*
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* This function has to be called only after device_run() callback has been
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* called on the driver. To prevent recursion, it should not be called directly
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* from the device_run() callback though.
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*/
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void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
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struct v4l2_m2m_ctx *m2m_ctx)
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{
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unsigned long flags;
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spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
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if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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dprintk("Called by an instance not currently running\n");
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return;
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}
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list_del(&m2m_dev->curr_ctx->queue);
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m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
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wake_up(&m2m_dev->curr_ctx->finished);
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m2m_dev->curr_ctx = NULL;
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spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
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/* This instance might have more buffers ready, but since we do not
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* allow more than one job on the job_queue per instance, each has
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* to be scheduled separately after the previous one finishes. */
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v4l2_m2m_try_schedule(m2m_ctx);
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v4l2_m2m_try_run(m2m_dev);
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}
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EXPORT_SYMBOL(v4l2_m2m_job_finish);
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/**
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* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
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*/
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int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_requestbuffers *reqbufs)
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{
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struct vb2_queue *vq;
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vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
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return vb2_reqbufs(vq, reqbufs);
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
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/**
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* v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
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*
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* See v4l2_m2m_mmap() documentation for details.
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*/
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int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf)
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{
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struct vb2_queue *vq;
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int ret = 0;
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unsigned int i;
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vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
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ret = vb2_querybuf(vq, buf);
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/* Adjust MMAP memory offsets for the CAPTURE queue */
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if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
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if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
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for (i = 0; i < buf->length; ++i)
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buf->m.planes[i].m.mem_offset
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+= DST_QUEUE_OFF_BASE;
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} else {
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buf->m.offset += DST_QUEUE_OFF_BASE;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
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/**
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* v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
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* the type
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*/
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int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf)
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{
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struct vb2_queue *vq;
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int ret;
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vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
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ret = vb2_qbuf(vq, buf);
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if (!ret)
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v4l2_m2m_try_schedule(m2m_ctx);
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
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/**
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* v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
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* the type
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*/
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int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf)
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{
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struct vb2_queue *vq;
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vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
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return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
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/**
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* v4l2_m2m_create_bufs() - create a source or destination buffer, depending
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* on the type
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*/
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int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_create_buffers *create)
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{
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struct vb2_queue *vq;
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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);
|
|
|