From patchwork Thu Nov 26 10:32:50 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pawel Osciak X-Patchwork-Id: 63129 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nAQAXCSG008564 for ; Thu, 26 Nov 2009 10:33:12 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760257AbZKZKdD (ORCPT ); Thu, 26 Nov 2009 05:33:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760254AbZKZKdC (ORCPT ); Thu, 26 Nov 2009 05:33:02 -0500 Received: from mailout1.w1.samsung.com ([210.118.77.11]:34448 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759401AbZKZKc7 (ORCPT ); Thu, 26 Nov 2009 05:32:59 -0500 Received: from eu_spt2 (mailout1.w1.samsung.com [210.118.77.11]) by mailout1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0KTP0024XPB3XF@mailout1.w1.samsung.com> for linux-media@vger.kernel.org; Thu, 26 Nov 2009 10:33:03 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0KTP00EAVPB374@spt2.w1.samsung.com> for linux-media@vger.kernel.org; Thu, 26 Nov 2009 10:33:03 +0000 (GMT) Received: from localhost.localdomain (unknown [106.116.37.23]) by linux.samsung.com (Postfix) with ESMTP id E987A270003; Thu, 26 Nov 2009 11:31:09 +0100 (CET) Date: Thu, 26 Nov 2009 11:32:50 +0100 From: Pawel Osciak Subject: [PATCH 1/2] Added memory-to-memory device helper framework for V4L2. In-reply-to: <1259231572-20334-1-git-send-email-p.osciak@samsung.com> To: linux-media@vger.kernel.org Cc: kyungmin.park@samsung.com, m.szyprowski@samsung.com, p.osciak@samsung.com Message-id: <1259231572-20334-2-git-send-email-p.osciak@samsung.com> MIME-version: 1.0 X-Mailer: git-send-email 1.6.5.3 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT References: <1259231572-20334-1-git-send-email-p.osciak@samsung.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org different from existing drivers that use memory buffers for only one of those at once. In terms of V4L2 such a device would be both of OUTPUT and CAPTURE type. Although no such devices are present in the V4L2 framework, a demand for such a model exists, e.g. for 'resizer devices'. Signed-off-by: Pawel Osciak Signed-off-by: Marek Szyprowski Reviewed-by: Kyungmin Park --- drivers/media/video/Kconfig | 4 + drivers/media/video/Makefile | 2 + drivers/media/video/v4l2-mem2mem.c | 671 ++++++++++++++++++++++++++++++++++++ include/media/v4l2-mem2mem.h | 152 ++++++++ 4 files changed, 829 insertions(+), 0 deletions(-) create mode 100644 drivers/media/video/v4l2-mem2mem.c create mode 100644 include/media/v4l2-mem2mem.h diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index e6186b3..b33d371 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -49,6 +49,10 @@ config VIDEO_TUNER tristate depends on MEDIA_TUNER +config V4L2_MEM2MEM_DEV + tristate + depends on VIDEOBUF_GEN + # # Multimedia Video device configuration # diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index e541932..22a9fef 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -112,6 +112,8 @@ obj-$(CONFIG_VIDEOBUF_VMALLOC) += videobuf-vmalloc.o obj-$(CONFIG_VIDEOBUF_DVB) += videobuf-dvb.o obj-$(CONFIG_VIDEO_BTCX) += btcx-risc.o +obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o + obj-$(CONFIG_VIDEO_M32R_AR_M64278) += arv.o obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o diff --git a/drivers/media/video/v4l2-mem2mem.c b/drivers/media/video/v4l2-mem2mem.c new file mode 100644 index 0000000..85e24c3 --- /dev/null +++ b/drivers/media/video/v4l2-mem2mem.c @@ -0,0 +1,671 @@ +/* + * Memory-to-memory device framework for Video for Linux 2. + * + * Helper functions for devices that use memory buffers for both source + * and destination. + * + * Copyright (c) 2009 Samsung Electronics Co., Ltd. + * Pawel Osciak, + * Marek Szyprowski, + * + * 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 +#include +#include +#include + +MODULE_DESCRIPTION("Mem to mem device framework for V4L2"); +MODULE_AUTHOR("Pawel Osciak, "); +MODULE_LICENSE("GPL"); + +static int debug; +module_param(debug, int, 0644); + +#define dprintk(fmt, arg...) do {\ + if (debug >= 1)\ + printk(KERN_DEBUG "%s: " fmt, __func__, ## arg); } while (0) + + +/* The instance is already queued on the jobqueue */ +#define TRANS_QUEUED (1 << 0) +/* The instance is currently running in hardware */ +#define TRANS_RUNNING (1 << 1) + + +/* 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 (TASK_SIZE / 2) + + +struct v4l2_m2m_dev { + /* Currently running instance */ + struct v4l2_m2m_ctx *curr_ctx; + /* Instances queued to run */ + struct list_head jobqueue; + spinlock_t job_spinlock; + + struct v4l2_m2m_ops *m2m_ops; +}; + +static inline +struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + switch (type) { + case V4L2_BUF_TYPE_VIDEO_CAPTURE: + return &m2m_ctx->cap_q_ctx; + case V4L2_BUF_TYPE_VIDEO_OUTPUT: + return &m2m_ctx->out_q_ctx; + default: + printk(KERN_ERR "Invalid buffer type\n"); + return NULL; + } +} + +/** + * v4l2_m2m_get_vq() - return videobuf_queue for the given type + */ +struct videobuf_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_get_src_vq() - return videobuf_queue for source buffers + */ +struct videobuf_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} +EXPORT_SYMBOL(v4l2_m2m_get_src_vq); + +/** + * v4l2_m2m_get_dst_vq() - return videobuf_queue for destination buffers + */ +struct videobuf_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); +} +EXPORT_SYMBOL(v4l2_m2m_get_dst_vq); + +/** + * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers + */ +static void *v4l2_m2m_next_buf(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + struct v4l2_m2m_queue_ctx *q_ctx; + struct videobuf_buffer *vb = NULL; + + q_ctx = get_queue_ctx(m2m_ctx, type); + + vb = list_entry(q_ctx->rdy_queue.next, struct videobuf_buffer, queue); + vb->state = VIDEOBUF_ACTIVE; + + return vb; +} + +/** + * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready + * buffers + */ +inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} +EXPORT_SYMBOL(v4l2_m2m_next_src_buf); + +/** + * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of + * ready buffers + */ +inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); +} +EXPORT_SYMBOL(v4l2_m2m_next_dst_buf); + +/** + * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and + * return it + */ +static void *v4l2_m2m_buf_remove(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + struct v4l2_m2m_queue_ctx *q_ctx; + struct videobuf_buffer *vb = NULL; + unsigned long flags = 0; + + q_ctx = get_queue_ctx(m2m_ctx, type); + + spin_lock_irqsave(q_ctx->q.irqlock, flags); + vb = list_entry(q_ctx->rdy_queue.next, struct videobuf_buffer, queue); + list_del(&vb->queue); + q_ctx->num_rdy--; + spin_unlock_irqrestore(q_ctx->q.irqlock, flags); + + return vb; +} + +/** + * v4l2_m2m_src_buf_remove() - take off a srouce buffer from the list of ready + * buffers and return it + */ +void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} +EXPORT_SYMBOL(v4l2_m2m_src_buf_remove); + +/** + * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of + * ready buffers and return it + */ +void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); + +} +EXPORT_SYMBOL(v4l2_m2m_dst_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) +{ + if (!m2m_dev->curr_ctx) + return NULL; + else + return m2m_dev->curr_ctx->priv; +} +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 = 0; + + 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->jobqueue)) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("No job pending\n"); + return; + } + + m2m_dev->curr_ctx = list_entry(m2m_dev->jobqueue.next, + 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); + + return; +} + +/** + * v4l2_m2m_schedule() - add an instance to the pending job queue + * @m2m_ctx: The instance to be added to the pending job queue + * + * Called when an instance is fully prepared to run a transaction, i.e. the + * instance will not sleep before finishing the transaction when run. + * If an instance is already on the queue, it will not be added for the second + * time and it is the responsibility of the instance to retry this at a later + * time. + */ +static void v4l2_m2m_schedule(struct v4l2_m2m_ctx *m2m_ctx) +{ + struct v4l2_m2m_dev *dev = m2m_ctx->m2m_dev; + unsigned long flags = 0; + + spin_lock_irqsave(&dev->job_spinlock, flags); + if (!(m2m_ctx->job_flags & TRANS_QUEUED)) { + list_add_tail(&m2m_ctx->queue, &dev->jobqueue); + m2m_ctx->job_flags |= TRANS_QUEUED; + } + spin_unlock_irqrestore(&dev->job_spinlock, flags); + + v4l2_m2m_try_run(dev); +} + +/** + * 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. + * + * There can also be additional, custom requirements. In such case the driver + * should supply a custom method (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. + */ +static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) +{ + struct v4l2_m2m_dev *m2m_dev; + unsigned long flags = 0; + + m2m_dev = m2m_ctx->m2m_dev; + dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + if (m2m_ctx->job_flags & TRANS_QUEUED) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("On job queue already\n"); + return; + } + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + + /* Checking only one queue is enough, we always turn on both */ + if (!m2m_ctx->out_q_ctx.q.streaming) { + dprintk("Streaming not on, will not schedule\n"); + return; + } + + if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { + dprintk("No input buffers available\n"); + return; + } + if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { + dprintk("No output buffers available\n"); + return; + } + + if (m2m_dev->m2m_ops->job_ready + && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { + dprintk("Driver not ready\n"); + return; + } + + dprintk("Instance ready to be scheduled\n"); + v4l2_m2m_schedule(m2m_ctx); +} + +/** + * 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. + * + * TODO: An instance that fails to give back the device before a predefined + * amount of time may have its device ownership taken away forcibly. + */ +void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, + struct v4l2_m2m_ctx *m2m_ctx) +{ + unsigned long flags = 0; + + 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; + } + + /*mutex_lock(&m2m_dev->dev_mutex);*/ + list_del(&m2m_dev->curr_ctx->queue); + m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); + m2m_dev->curr_ctx = NULL; + + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + + 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 videobuf_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); + return videobuf_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 videobuf_queue *vq; + int ret = 0; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + ret = videobuf_querybuf(vq, buf); + + if (buf->memory == V4L2_MEMORY_MMAP + && vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { + 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 videobuf_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + return videobuf_qbuf(vq, buf); +} +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 videobuf_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + return videobuf_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); + +/** + * v4l2_M2m_streamon() - start streaming + */ +int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + int ret = 0; + + /* These can fail only if the queues are in use, + * but they shouldn't be as we are managing instances manually */ + ret = videobuf_streamon(&m2m_ctx->out_q_ctx.q); + if (ret) { + printk(KERN_ERR "Streamon on output queue failed\n"); + return ret; + } + + ret = videobuf_streamon(&m2m_ctx->cap_q_ctx.q); + if (ret) { + printk(KERN_ERR "Streamon on capture queue failed\n"); + return ret; + } + + v4l2_m2m_try_schedule(m2m_ctx); + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); + +/** + * v4l2_m2m_streamoff() - stop streaming + */ +int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + /* streamoff() fails only when we are not streaming */ + if (videobuf_streamoff(&m2m_ctx->out_q_ctx.q) + || videobuf_streamoff(&m2m_ctx->cap_q_ctx.q)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); + +/** + * v4l2_m2m_poll() - poll replacement, for destination buffers only + * + * Call from driver's poll() function. Will poll the destination queue only. + */ +unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct poll_table_struct *wait) +{ + struct videobuf_queue *dst_q = NULL; + struct videobuf_buffer *vb = NULL; + unsigned int rc = 0; + + dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); + + mutex_lock(&dst_q->vb_lock); + + if (dst_q->streaming) { + if (!list_empty(&dst_q->stream)) + vb = list_entry(dst_q->stream.next, + struct videobuf_buffer, stream); + } + + if (!vb) + rc = POLLERR; + + if (0 == rc) { + poll_wait(file, &vb->done, wait); + if (vb->state == VIDEOBUF_DONE || vb->state == VIDEOBUF_ERROR) + rc = POLLOUT | POLLRDNORM; + } + + mutex_unlock(&dst_q->vb_lock); + 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 differentation 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 videobuf_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 videobuf_mmap_mapper(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(struct v4l2_m2m_ops *m2m_ops) +{ + struct v4l2_m2m_dev *m2m_dev; + + if (!m2m_ops) + return ERR_PTR(-EINVAL); + + /*BUG_ON(!m2m_ops->job_ready);*/ + BUG_ON(!m2m_ops->device_run); + BUG_ON(!m2m_ops->job_abort); + + 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->jobqueue); + 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(void *priv, struct v4l2_m2m_dev *m2m_dev, + void (*vq_init)(void *priv, struct videobuf_queue *, + enum v4l2_buf_type)) +{ + struct v4l2_m2m_ctx *m2m_ctx; + struct v4l2_m2m_queue_ctx *out_q_ctx; + struct v4l2_m2m_queue_ctx *cap_q_ctx; + + if (!vq_init) + return ERR_PTR(-EINVAL); + + m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); + if (!m2m_ctx) + return ERR_PTR(-ENOMEM); + + m2m_ctx->priv = priv; + m2m_ctx->m2m_dev = m2m_dev; + + out_q_ctx = get_queue_ctx(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); + cap_q_ctx = get_queue_ctx(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); + + INIT_LIST_HEAD(&out_q_ctx->rdy_queue); + INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); + + /*spin_lock_init(&m2m_ctx->queue_lock);*/ + INIT_LIST_HEAD(&m2m_ctx->queue); + + vq_init(priv, &out_q_ctx->q, V4L2_BUF_TYPE_VIDEO_OUTPUT); + vq_init(priv, &cap_q_ctx->q, V4L2_BUF_TYPE_VIDEO_CAPTURE); + out_q_ctx->q.priv_data = cap_q_ctx->q.priv_data = m2m_ctx; + + return m2m_ctx; +} +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) +{ + struct v4l2_m2m_dev *m2m_dev; + struct videobuf_buffer *vb; + unsigned long flags = 0; + + m2m_dev = m2m_ctx->m2m_dev; + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + 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); + vb = v4l2_m2m_next_dst_buf(m2m_ctx); + BUG_ON(NULL == vb); + wait_event(vb->done, vb->state != VIDEOBUF_ACTIVE + && vb->state != VIDEOBUF_QUEUED); + } 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); + } + + videobuf_stop(&m2m_ctx->cap_q_ctx.q); + videobuf_stop(&m2m_ctx->out_q_ctx.q); + + videobuf_mmap_free(&m2m_ctx->cap_q_ctx.q); + videobuf_mmap_free(&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 withing buf_queue() videobuf_queue_ops callback. + */ +/* Locking: Caller holds q->irqlock */ +void v4l2_m2m_buf_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) +{ + struct v4l2_m2m_ctx *m2m_ctx = vq->priv_data; + struct v4l2_m2m_queue_ctx *q_ctx; + + q_ctx = get_queue_ctx(m2m_ctx, vq->type); + if (!q_ctx) + return; + + list_add_tail(&vb->queue, &q_ctx->rdy_queue); + q_ctx->num_rdy++; + + vb->state = VIDEOBUF_QUEUED; + + v4l2_m2m_try_schedule(m2m_ctx); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); + diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h new file mode 100644 index 0000000..b001629 --- /dev/null +++ b/include/media/v4l2-mem2mem.h @@ -0,0 +1,152 @@ +/* + * Memory-to-memory device framework for Video for Linux 2. + * + * Helper functions for devices that use memory buffers for both source + * and destination. + * + * Copyright (c) 2009 Samsung Electronics Co., Ltd. + * Pawel Osciak, + * Marek Szyprowski, + * + * 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 + */ + +#ifndef _MEDIA_V4L2_MEM2MEM_H +#define _MEDIA_V4L2_MEM2MEM_H + +#include + +/** + * struct v4l2_m2m_ops - mem-to-mem device driver callbacks + * @device_run: required. Begin the actual job (transaction) inside this + * callback. + * The job does NOT have to end before this callback returns + * (and it will be the usual case). When the job finishes, + * v4l2_m2m_job_finish() has to be called. + * @job_ready: optional. Should return 0 if the driver does not have a job + * fully prepared to run yet (i.e. it will not be able to finish a + * transactio without sleeping). If not provided, it will be + * assumed that one source and one destination buffer are all + * that is required for the driver to perform one full transaction. + * @job_abort: required. Informs the driver that it has to abort the currently + * running transaction as soon as possible (i.e. as soon as it can + * stop the device safely; e.g. in the next interrupt handler), + * even if the transaction would not have been finished by then. + * After the driver performs the necessary steps, it has to call + * v4l2_m2m_job_finish() (as if the transaction ended normally). + * This function does not have to (and will usually not) wait + * until the device enters a state when it can be stopped. + */ +struct v4l2_m2m_ops { + void (*device_run)(void *priv); + int (*job_ready)(void *priv); + void (*job_abort)(void *priv); +}; + +struct v4l2_m2m_dev; + +struct v4l2_m2m_queue_ctx { +/* private: internal use only */ + struct videobuf_queue q; + + /* Base value for offsets of mmaped buffers on this queue */ + unsigned long offset_base; + + /* Queue for buffers ready to be processed as soon as this + * instance receives access to the device */ + struct list_head rdy_queue; + u8 num_rdy; +}; + +struct v4l2_m2m_ctx { +/* private: internal use only */ + struct v4l2_m2m_dev *m2m_dev; + + /* Capture (output to memory) queue context */ + struct v4l2_m2m_queue_ctx cap_q_ctx; + + /* Output (input from memory) queue context */ + struct v4l2_m2m_queue_ctx out_q_ctx; + + /* For device job queue */ + struct list_head queue; + unsigned long job_flags; + + /* Instance private data */ + void *priv; +}; + +void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev); + +struct videobuf_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx); +struct videobuf_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx); +struct videobuf_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); + +void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, + struct v4l2_m2m_ctx *m2m_ctx); + +void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx); +void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx); + +void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx); +void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx); + + +int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_requestbuffers *reqbufs); + +int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); + +int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); +int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); + +int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); +int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); + +unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct poll_table_struct *wait); + +int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct vm_area_struct *vma); + +struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops); +void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev); + +struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(void *priv, struct v4l2_m2m_dev *m2m_dev, + void (*vq_init)(void *priv, struct videobuf_queue *, + enum v4l2_buf_type)); +void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx); + +void v4l2_m2m_buf_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb); + +/** + * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for + * use + */ +static inline +unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) +{ + return m2m_ctx->cap_q_ctx.num_rdy; +} + +/** + * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers + * ready for use + */ +static inline +unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) +{ + return m2m_ctx->out_q_ctx.num_rdy; +} + +#endif /* _MEDIA_V4L2_MEM2MEM_H */ +