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