![Linus Torvalds](/assets/img/avatar_default.png)
My 'allmodconfig' build is _almost_ free of warnings, and most of the
remaining ones are for legacy drivers that just do bad things that I
can't find it in my black heart to care too much about. But this one
was just annoying me:
drivers/media/v4l2-core/videobuf2-core.c:3256:26: warning: unused variable ‘fileio’ [-Wunused-variable]
because commit 0e66100637
("[media] vb2: fix 'UNBALANCED' warnings
when calling vb2_thread_stop()") removed all users of 'fileio' and
instead calls "__vb2_cleanup_fileio(q)" to clean up q->fileio. But the
now unused 'fileio' variable was left around.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3540 lines
97 KiB
C
3540 lines
97 KiB
C
/*
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* videobuf2-core.c - V4L2 driver helper framework
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* The vb2_thread implementation was based on code from videobuf-dvb.c:
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* (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
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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
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* the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/freezer.h>
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#include <linux/kthread.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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#include <media/v4l2-common.h>
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#include <media/videobuf2-core.h>
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static int debug;
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module_param(debug, int, 0644);
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#define dprintk(level, fmt, arg...) \
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do { \
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if (debug >= level) \
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pr_info("vb2: %s: " fmt, __func__, ## arg); \
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} while (0)
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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/*
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* If advanced debugging is on, then count how often each op is called
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* successfully, which can either be per-buffer or per-queue.
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*
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* This makes it easy to check that the 'init' and 'cleanup'
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* (and variations thereof) stay balanced.
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*/
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#define log_memop(vb, op) \
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dprintk(2, "call_memop(%p, %d, %s)%s\n", \
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(vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \
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(vb)->vb2_queue->mem_ops->op ? "" : " (nop)")
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#define call_memop(vb, op, args...) \
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({ \
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struct vb2_queue *_q = (vb)->vb2_queue; \
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int err; \
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\
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log_memop(vb, op); \
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err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \
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if (!err) \
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(vb)->cnt_mem_ ## op++; \
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err; \
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})
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#define call_ptr_memop(vb, op, args...) \
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({ \
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struct vb2_queue *_q = (vb)->vb2_queue; \
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void *ptr; \
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\
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log_memop(vb, op); \
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ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \
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if (!IS_ERR_OR_NULL(ptr)) \
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(vb)->cnt_mem_ ## op++; \
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ptr; \
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})
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#define call_void_memop(vb, op, args...) \
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({ \
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struct vb2_queue *_q = (vb)->vb2_queue; \
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\
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log_memop(vb, op); \
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if (_q->mem_ops->op) \
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_q->mem_ops->op(args); \
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(vb)->cnt_mem_ ## op++; \
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})
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#define log_qop(q, op) \
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dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \
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(q)->ops->op ? "" : " (nop)")
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#define call_qop(q, op, args...) \
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({ \
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int err; \
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\
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log_qop(q, op); \
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err = (q)->ops->op ? (q)->ops->op(args) : 0; \
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if (!err) \
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(q)->cnt_ ## op++; \
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err; \
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})
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#define call_void_qop(q, op, args...) \
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({ \
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log_qop(q, op); \
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if ((q)->ops->op) \
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(q)->ops->op(args); \
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(q)->cnt_ ## op++; \
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})
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#define log_vb_qop(vb, op, args...) \
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dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \
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(vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \
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(vb)->vb2_queue->ops->op ? "" : " (nop)")
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#define call_vb_qop(vb, op, args...) \
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({ \
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int err; \
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\
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log_vb_qop(vb, op); \
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err = (vb)->vb2_queue->ops->op ? \
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(vb)->vb2_queue->ops->op(args) : 0; \
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if (!err) \
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(vb)->cnt_ ## op++; \
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err; \
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})
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#define call_void_vb_qop(vb, op, args...) \
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({ \
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log_vb_qop(vb, op); \
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if ((vb)->vb2_queue->ops->op) \
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(vb)->vb2_queue->ops->op(args); \
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(vb)->cnt_ ## op++; \
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})
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#else
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#define call_memop(vb, op, args...) \
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((vb)->vb2_queue->mem_ops->op ? \
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(vb)->vb2_queue->mem_ops->op(args) : 0)
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#define call_ptr_memop(vb, op, args...) \
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((vb)->vb2_queue->mem_ops->op ? \
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(vb)->vb2_queue->mem_ops->op(args) : NULL)
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#define call_void_memop(vb, op, args...) \
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do { \
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if ((vb)->vb2_queue->mem_ops->op) \
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(vb)->vb2_queue->mem_ops->op(args); \
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} while (0)
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#define call_qop(q, op, args...) \
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((q)->ops->op ? (q)->ops->op(args) : 0)
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#define call_void_qop(q, op, args...) \
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do { \
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if ((q)->ops->op) \
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(q)->ops->op(args); \
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} while (0)
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#define call_vb_qop(vb, op, args...) \
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((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0)
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#define call_void_vb_qop(vb, op, args...) \
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do { \
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if ((vb)->vb2_queue->ops->op) \
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(vb)->vb2_queue->ops->op(args); \
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} while (0)
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#endif
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/* Flags that are set by the vb2 core */
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#define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
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V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
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V4L2_BUF_FLAG_PREPARED | \
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V4L2_BUF_FLAG_TIMESTAMP_MASK)
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/* Output buffer flags that should be passed on to the driver */
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#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
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V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
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static void __vb2_queue_cancel(struct vb2_queue *q);
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/**
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* __vb2_buf_mem_alloc() - allocate video memory for the given buffer
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*/
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static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
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{
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struct vb2_queue *q = vb->vb2_queue;
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enum dma_data_direction dma_dir =
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V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
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void *mem_priv;
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int plane;
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/*
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* Allocate memory for all planes in this buffer
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* NOTE: mmapped areas should be page aligned
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*/
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for (plane = 0; plane < vb->num_planes; ++plane) {
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unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]);
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mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane],
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size, dma_dir, q->gfp_flags);
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if (IS_ERR_OR_NULL(mem_priv))
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goto free;
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/* Associate allocator private data with this plane */
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vb->planes[plane].mem_priv = mem_priv;
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vb->v4l2_planes[plane].length = q->plane_sizes[plane];
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}
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return 0;
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free:
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/* Free already allocated memory if one of the allocations failed */
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for (; plane > 0; --plane) {
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call_void_memop(vb, put, vb->planes[plane - 1].mem_priv);
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vb->planes[plane - 1].mem_priv = NULL;
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}
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return -ENOMEM;
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}
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/**
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* __vb2_buf_mem_free() - free memory of the given buffer
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*/
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static void __vb2_buf_mem_free(struct vb2_buffer *vb)
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{
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unsigned int plane;
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for (plane = 0; plane < vb->num_planes; ++plane) {
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call_void_memop(vb, put, vb->planes[plane].mem_priv);
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vb->planes[plane].mem_priv = NULL;
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dprintk(3, "freed plane %d of buffer %d\n", plane,
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vb->v4l2_buf.index);
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}
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}
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/**
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* __vb2_buf_userptr_put() - release userspace memory associated with
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* a USERPTR buffer
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*/
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static void __vb2_buf_userptr_put(struct vb2_buffer *vb)
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{
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unsigned int plane;
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for (plane = 0; plane < vb->num_planes; ++plane) {
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if (vb->planes[plane].mem_priv)
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call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv);
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vb->planes[plane].mem_priv = NULL;
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}
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}
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/**
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* __vb2_plane_dmabuf_put() - release memory associated with
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* a DMABUF shared plane
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*/
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static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p)
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{
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if (!p->mem_priv)
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return;
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if (p->dbuf_mapped)
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call_void_memop(vb, unmap_dmabuf, p->mem_priv);
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call_void_memop(vb, detach_dmabuf, p->mem_priv);
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dma_buf_put(p->dbuf);
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memset(p, 0, sizeof(*p));
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}
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/**
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* __vb2_buf_dmabuf_put() - release memory associated with
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* a DMABUF shared buffer
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*/
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static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb)
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{
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unsigned int plane;
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for (plane = 0; plane < vb->num_planes; ++plane)
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__vb2_plane_dmabuf_put(vb, &vb->planes[plane]);
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}
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/**
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* __setup_lengths() - setup initial lengths for every plane in
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* every buffer on the queue
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*/
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static void __setup_lengths(struct vb2_queue *q, unsigned int n)
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{
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unsigned int buffer, plane;
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struct vb2_buffer *vb;
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for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) {
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vb = q->bufs[buffer];
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if (!vb)
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continue;
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for (plane = 0; plane < vb->num_planes; ++plane)
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vb->v4l2_planes[plane].length = q->plane_sizes[plane];
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}
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}
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/**
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* __setup_offsets() - setup unique offsets ("cookies") for every plane in
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* every buffer on the queue
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*/
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static void __setup_offsets(struct vb2_queue *q, unsigned int n)
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{
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unsigned int buffer, plane;
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struct vb2_buffer *vb;
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unsigned long off;
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if (q->num_buffers) {
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struct v4l2_plane *p;
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vb = q->bufs[q->num_buffers - 1];
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p = &vb->v4l2_planes[vb->num_planes - 1];
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off = PAGE_ALIGN(p->m.mem_offset + p->length);
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} else {
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off = 0;
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}
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for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) {
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vb = q->bufs[buffer];
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if (!vb)
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continue;
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for (plane = 0; plane < vb->num_planes; ++plane) {
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vb->v4l2_planes[plane].m.mem_offset = off;
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dprintk(3, "buffer %d, plane %d offset 0x%08lx\n",
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buffer, plane, off);
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off += vb->v4l2_planes[plane].length;
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off = PAGE_ALIGN(off);
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}
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}
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}
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/**
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* __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type)
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* video buffer memory for all buffers/planes on the queue and initializes the
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* queue
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*
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* Returns the number of buffers successfully allocated.
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*/
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static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory,
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unsigned int num_buffers, unsigned int num_planes)
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{
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unsigned int buffer;
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struct vb2_buffer *vb;
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int ret;
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for (buffer = 0; buffer < num_buffers; ++buffer) {
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/* Allocate videobuf buffer structures */
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vb = kzalloc(q->buf_struct_size, GFP_KERNEL);
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if (!vb) {
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dprintk(1, "memory alloc for buffer struct failed\n");
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break;
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}
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/* Length stores number of planes for multiplanar buffers */
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if (V4L2_TYPE_IS_MULTIPLANAR(q->type))
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vb->v4l2_buf.length = num_planes;
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vb->state = VB2_BUF_STATE_DEQUEUED;
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vb->vb2_queue = q;
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vb->num_planes = num_planes;
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vb->v4l2_buf.index = q->num_buffers + buffer;
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vb->v4l2_buf.type = q->type;
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vb->v4l2_buf.memory = memory;
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/* Allocate video buffer memory for the MMAP type */
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if (memory == V4L2_MEMORY_MMAP) {
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ret = __vb2_buf_mem_alloc(vb);
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if (ret) {
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dprintk(1, "failed allocating memory for "
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"buffer %d\n", buffer);
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kfree(vb);
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break;
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}
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/*
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* Call the driver-provided buffer initialization
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* callback, if given. An error in initialization
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* results in queue setup failure.
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*/
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ret = call_vb_qop(vb, buf_init, vb);
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if (ret) {
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dprintk(1, "buffer %d %p initialization"
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" failed\n", buffer, vb);
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__vb2_buf_mem_free(vb);
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kfree(vb);
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break;
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}
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}
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q->bufs[q->num_buffers + buffer] = vb;
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}
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__setup_lengths(q, buffer);
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if (memory == V4L2_MEMORY_MMAP)
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__setup_offsets(q, buffer);
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dprintk(1, "allocated %d buffers, %d plane(s) each\n",
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buffer, num_planes);
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return buffer;
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}
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/**
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* __vb2_free_mem() - release all video buffer memory for a given queue
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*/
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static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
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{
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unsigned int buffer;
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struct vb2_buffer *vb;
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for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
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++buffer) {
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vb = q->bufs[buffer];
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if (!vb)
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continue;
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/* Free MMAP buffers or release USERPTR buffers */
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if (q->memory == V4L2_MEMORY_MMAP)
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__vb2_buf_mem_free(vb);
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else if (q->memory == V4L2_MEMORY_DMABUF)
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__vb2_buf_dmabuf_put(vb);
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else
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__vb2_buf_userptr_put(vb);
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}
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}
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|
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/**
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* __vb2_queue_free() - free buffers at the end of the queue - video memory and
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* related information, if no buffers are left return the queue to an
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* uninitialized state. Might be called even if the queue has already been freed.
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*/
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static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
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{
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unsigned int buffer;
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/*
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* Sanity check: when preparing a buffer the queue lock is released for
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* a short while (see __buf_prepare for the details), which would allow
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* a race with a reqbufs which can call this function. Removing the
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* buffers from underneath __buf_prepare is obviously a bad idea, so we
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* check if any of the buffers is in the state PREPARING, and if so we
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* just return -EAGAIN.
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*/
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for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
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++buffer) {
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if (q->bufs[buffer] == NULL)
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continue;
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if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) {
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dprintk(1, "preparing buffers, cannot free\n");
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return -EAGAIN;
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}
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}
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|
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/* Call driver-provided cleanup function for each buffer, if provided */
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for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
|
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++buffer) {
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struct vb2_buffer *vb = q->bufs[buffer];
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if (vb && vb->planes[0].mem_priv)
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call_void_vb_qop(vb, buf_cleanup, vb);
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}
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|
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/* Release video buffer memory */
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__vb2_free_mem(q, buffers);
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|
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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/*
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|
* Check that all the calls were balances during the life-time of this
|
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* queue. If not (or if the debug level is 1 or up), then dump the
|
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* counters to the kernel log.
|
|
*/
|
|
if (q->num_buffers) {
|
|
bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
|
|
q->cnt_wait_prepare != q->cnt_wait_finish;
|
|
|
|
if (unbalanced || debug) {
|
|
pr_info("vb2: counters for queue %p:%s\n", q,
|
|
unbalanced ? " UNBALANCED!" : "");
|
|
pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n",
|
|
q->cnt_queue_setup, q->cnt_start_streaming,
|
|
q->cnt_stop_streaming);
|
|
pr_info("vb2: wait_prepare: %u wait_finish: %u\n",
|
|
q->cnt_wait_prepare, q->cnt_wait_finish);
|
|
}
|
|
q->cnt_queue_setup = 0;
|
|
q->cnt_wait_prepare = 0;
|
|
q->cnt_wait_finish = 0;
|
|
q->cnt_start_streaming = 0;
|
|
q->cnt_stop_streaming = 0;
|
|
}
|
|
for (buffer = 0; buffer < q->num_buffers; ++buffer) {
|
|
struct vb2_buffer *vb = q->bufs[buffer];
|
|
bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put ||
|
|
vb->cnt_mem_prepare != vb->cnt_mem_finish ||
|
|
vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr ||
|
|
vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf ||
|
|
vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf ||
|
|
vb->cnt_buf_queue != vb->cnt_buf_done ||
|
|
vb->cnt_buf_prepare != vb->cnt_buf_finish ||
|
|
vb->cnt_buf_init != vb->cnt_buf_cleanup;
|
|
|
|
if (unbalanced || debug) {
|
|
pr_info("vb2: counters for queue %p, buffer %d:%s\n",
|
|
q, buffer, unbalanced ? " UNBALANCED!" : "");
|
|
pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n",
|
|
vb->cnt_buf_init, vb->cnt_buf_cleanup,
|
|
vb->cnt_buf_prepare, vb->cnt_buf_finish);
|
|
pr_info("vb2: buf_queue: %u buf_done: %u\n",
|
|
vb->cnt_buf_queue, vb->cnt_buf_done);
|
|
pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n",
|
|
vb->cnt_mem_alloc, vb->cnt_mem_put,
|
|
vb->cnt_mem_prepare, vb->cnt_mem_finish,
|
|
vb->cnt_mem_mmap);
|
|
pr_info("vb2: get_userptr: %u put_userptr: %u\n",
|
|
vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr);
|
|
pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n",
|
|
vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf,
|
|
vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf);
|
|
pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n",
|
|
vb->cnt_mem_get_dmabuf,
|
|
vb->cnt_mem_num_users,
|
|
vb->cnt_mem_vaddr,
|
|
vb->cnt_mem_cookie);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Free videobuf buffers */
|
|
for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
|
|
++buffer) {
|
|
kfree(q->bufs[buffer]);
|
|
q->bufs[buffer] = NULL;
|
|
}
|
|
|
|
q->num_buffers -= buffers;
|
|
if (!q->num_buffers) {
|
|
q->memory = 0;
|
|
INIT_LIST_HEAD(&q->queued_list);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __verify_planes_array() - verify that the planes array passed in struct
|
|
* v4l2_buffer from userspace can be safely used
|
|
*/
|
|
static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
|
|
return 0;
|
|
|
|
/* Is memory for copying plane information present? */
|
|
if (NULL == b->m.planes) {
|
|
dprintk(1, "multi-planar buffer passed but "
|
|
"planes array not provided\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) {
|
|
dprintk(1, "incorrect planes array length, "
|
|
"expected %d, got %d\n", vb->num_planes, b->length);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __verify_length() - Verify that the bytesused value for each plane fits in
|
|
* the plane length and that the data offset doesn't exceed the bytesused value.
|
|
*/
|
|
static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
unsigned int length;
|
|
unsigned int bytesused;
|
|
unsigned int plane;
|
|
|
|
if (!V4L2_TYPE_IS_OUTPUT(b->type))
|
|
return 0;
|
|
|
|
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
length = (b->memory == V4L2_MEMORY_USERPTR ||
|
|
b->memory == V4L2_MEMORY_DMABUF)
|
|
? b->m.planes[plane].length
|
|
: vb->v4l2_planes[plane].length;
|
|
bytesused = b->m.planes[plane].bytesused
|
|
? b->m.planes[plane].bytesused : length;
|
|
|
|
if (b->m.planes[plane].bytesused > length)
|
|
return -EINVAL;
|
|
|
|
if (b->m.planes[plane].data_offset > 0 &&
|
|
b->m.planes[plane].data_offset >= bytesused)
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
length = (b->memory == V4L2_MEMORY_USERPTR)
|
|
? b->length : vb->v4l2_planes[0].length;
|
|
bytesused = b->bytesused ? b->bytesused : length;
|
|
|
|
if (b->bytesused > length)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __buffer_in_use() - return true if the buffer is in use and
|
|
* the queue cannot be freed (by the means of REQBUFS(0)) call
|
|
*/
|
|
static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb)
|
|
{
|
|
unsigned int plane;
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
void *mem_priv = vb->planes[plane].mem_priv;
|
|
/*
|
|
* If num_users() has not been provided, call_memop
|
|
* will return 0, apparently nobody cares about this
|
|
* case anyway. If num_users() returns more than 1,
|
|
* we are not the only user of the plane's memory.
|
|
*/
|
|
if (mem_priv && call_memop(vb, num_users, mem_priv) > 1)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* __buffers_in_use() - return true if any buffers on the queue are in use and
|
|
* the queue cannot be freed (by the means of REQBUFS(0)) call
|
|
*/
|
|
static bool __buffers_in_use(struct vb2_queue *q)
|
|
{
|
|
unsigned int buffer;
|
|
for (buffer = 0; buffer < q->num_buffers; ++buffer) {
|
|
if (__buffer_in_use(q, q->bufs[buffer]))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
|
|
* returned to userspace
|
|
*/
|
|
static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
|
|
{
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
|
|
/* Copy back data such as timestamp, flags, etc. */
|
|
memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m));
|
|
b->reserved2 = vb->v4l2_buf.reserved2;
|
|
b->reserved = vb->v4l2_buf.reserved;
|
|
|
|
if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) {
|
|
/*
|
|
* Fill in plane-related data if userspace provided an array
|
|
* for it. The caller has already verified memory and size.
|
|
*/
|
|
b->length = vb->num_planes;
|
|
memcpy(b->m.planes, vb->v4l2_planes,
|
|
b->length * sizeof(struct v4l2_plane));
|
|
} else {
|
|
/*
|
|
* We use length and offset in v4l2_planes array even for
|
|
* single-planar buffers, but userspace does not.
|
|
*/
|
|
b->length = vb->v4l2_planes[0].length;
|
|
b->bytesused = vb->v4l2_planes[0].bytesused;
|
|
if (q->memory == V4L2_MEMORY_MMAP)
|
|
b->m.offset = vb->v4l2_planes[0].m.mem_offset;
|
|
else if (q->memory == V4L2_MEMORY_USERPTR)
|
|
b->m.userptr = vb->v4l2_planes[0].m.userptr;
|
|
else if (q->memory == V4L2_MEMORY_DMABUF)
|
|
b->m.fd = vb->v4l2_planes[0].m.fd;
|
|
}
|
|
|
|
/*
|
|
* Clear any buffer state related flags.
|
|
*/
|
|
b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
|
|
b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
|
|
if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
|
|
V4L2_BUF_FLAG_TIMESTAMP_COPY) {
|
|
/*
|
|
* For non-COPY timestamps, drop timestamp source bits
|
|
* and obtain the timestamp source from the queue.
|
|
*/
|
|
b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
|
|
b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
|
|
}
|
|
|
|
switch (vb->state) {
|
|
case VB2_BUF_STATE_QUEUED:
|
|
case VB2_BUF_STATE_ACTIVE:
|
|
b->flags |= V4L2_BUF_FLAG_QUEUED;
|
|
break;
|
|
case VB2_BUF_STATE_ERROR:
|
|
b->flags |= V4L2_BUF_FLAG_ERROR;
|
|
/* fall through */
|
|
case VB2_BUF_STATE_DONE:
|
|
b->flags |= V4L2_BUF_FLAG_DONE;
|
|
break;
|
|
case VB2_BUF_STATE_PREPARED:
|
|
b->flags |= V4L2_BUF_FLAG_PREPARED;
|
|
break;
|
|
case VB2_BUF_STATE_PREPARING:
|
|
case VB2_BUF_STATE_DEQUEUED:
|
|
/* nothing */
|
|
break;
|
|
}
|
|
|
|
if (__buffer_in_use(q, vb))
|
|
b->flags |= V4L2_BUF_FLAG_MAPPED;
|
|
}
|
|
|
|
/**
|
|
* vb2_querybuf() - query video buffer information
|
|
* @q: videobuf queue
|
|
* @b: buffer struct passed from userspace to vidioc_querybuf handler
|
|
* in driver
|
|
*
|
|
* Should be called from vidioc_querybuf ioctl handler in driver.
|
|
* This function will verify the passed v4l2_buffer structure and fill the
|
|
* relevant information for the userspace.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_querybuf handler in driver.
|
|
*/
|
|
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
struct vb2_buffer *vb;
|
|
int ret;
|
|
|
|
if (b->type != q->type) {
|
|
dprintk(1, "wrong buffer type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (b->index >= q->num_buffers) {
|
|
dprintk(1, "buffer index out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
vb = q->bufs[b->index];
|
|
ret = __verify_planes_array(vb, b);
|
|
if (!ret)
|
|
__fill_v4l2_buffer(vb, b);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(vb2_querybuf);
|
|
|
|
/**
|
|
* __verify_userptr_ops() - verify that all memory operations required for
|
|
* USERPTR queue type have been provided
|
|
*/
|
|
static int __verify_userptr_ops(struct vb2_queue *q)
|
|
{
|
|
if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr ||
|
|
!q->mem_ops->put_userptr)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __verify_mmap_ops() - verify that all memory operations required for
|
|
* MMAP queue type have been provided
|
|
*/
|
|
static int __verify_mmap_ops(struct vb2_queue *q)
|
|
{
|
|
if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc ||
|
|
!q->mem_ops->put || !q->mem_ops->mmap)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __verify_dmabuf_ops() - verify that all memory operations required for
|
|
* DMABUF queue type have been provided
|
|
*/
|
|
static int __verify_dmabuf_ops(struct vb2_queue *q)
|
|
{
|
|
if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf ||
|
|
!q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf ||
|
|
!q->mem_ops->unmap_dmabuf)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __verify_memory_type() - Check whether the memory type and buffer type
|
|
* passed to a buffer operation are compatible with the queue.
|
|
*/
|
|
static int __verify_memory_type(struct vb2_queue *q,
|
|
enum v4l2_memory memory, enum v4l2_buf_type type)
|
|
{
|
|
if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR &&
|
|
memory != V4L2_MEMORY_DMABUF) {
|
|
dprintk(1, "unsupported memory type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (type != q->type) {
|
|
dprintk(1, "requested type is incorrect\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Make sure all the required memory ops for given memory type
|
|
* are available.
|
|
*/
|
|
if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) {
|
|
dprintk(1, "MMAP for current setup unsupported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) {
|
|
dprintk(1, "USERPTR for current setup unsupported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) {
|
|
dprintk(1, "DMABUF for current setup unsupported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Place the busy tests at the end: -EBUSY can be ignored when
|
|
* create_bufs is called with count == 0, but count == 0 should still
|
|
* do the memory and type validation.
|
|
*/
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __reqbufs() - Initiate streaming
|
|
* @q: videobuf2 queue
|
|
* @req: struct passed from userspace to vidioc_reqbufs handler in driver
|
|
*
|
|
* Should be called from vidioc_reqbufs ioctl handler of a driver.
|
|
* This function:
|
|
* 1) verifies streaming parameters passed from the userspace,
|
|
* 2) sets up the queue,
|
|
* 3) negotiates number of buffers and planes per buffer with the driver
|
|
* to be used during streaming,
|
|
* 4) allocates internal buffer structures (struct vb2_buffer), according to
|
|
* the agreed parameters,
|
|
* 5) for MMAP memory type, allocates actual video memory, using the
|
|
* memory handling/allocation routines provided during queue initialization
|
|
*
|
|
* If req->count is 0, all the memory will be freed instead.
|
|
* If the queue has been allocated previously (by a previous vb2_reqbufs) call
|
|
* and the queue is not busy, memory will be reallocated.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_reqbufs handler in driver.
|
|
*/
|
|
static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
|
|
{
|
|
unsigned int num_buffers, allocated_buffers, num_planes = 0;
|
|
int ret;
|
|
|
|
if (q->streaming) {
|
|
dprintk(1, "streaming active\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) {
|
|
/*
|
|
* We already have buffers allocated, so first check if they
|
|
* are not in use and can be freed.
|
|
*/
|
|
mutex_lock(&q->mmap_lock);
|
|
if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) {
|
|
mutex_unlock(&q->mmap_lock);
|
|
dprintk(1, "memory in use, cannot free\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/*
|
|
* Call queue_cancel to clean up any buffers in the PREPARED or
|
|
* QUEUED state which is possible if buffers were prepared or
|
|
* queued without ever calling STREAMON.
|
|
*/
|
|
__vb2_queue_cancel(q);
|
|
ret = __vb2_queue_free(q, q->num_buffers);
|
|
mutex_unlock(&q->mmap_lock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* In case of REQBUFS(0) return immediately without calling
|
|
* driver's queue_setup() callback and allocating resources.
|
|
*/
|
|
if (req->count == 0)
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Make sure the requested values and current defaults are sane.
|
|
*/
|
|
num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME);
|
|
num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed);
|
|
memset(q->plane_sizes, 0, sizeof(q->plane_sizes));
|
|
memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx));
|
|
q->memory = req->memory;
|
|
|
|
/*
|
|
* Ask the driver how many buffers and planes per buffer it requires.
|
|
* Driver also sets the size and allocator context for each plane.
|
|
*/
|
|
ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes,
|
|
q->plane_sizes, q->alloc_ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Finally, allocate buffers and video memory */
|
|
allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes);
|
|
if (allocated_buffers == 0) {
|
|
dprintk(1, "memory allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* There is no point in continuing if we can't allocate the minimum
|
|
* number of buffers needed by this vb2_queue.
|
|
*/
|
|
if (allocated_buffers < q->min_buffers_needed)
|
|
ret = -ENOMEM;
|
|
|
|
/*
|
|
* Check if driver can handle the allocated number of buffers.
|
|
*/
|
|
if (!ret && allocated_buffers < num_buffers) {
|
|
num_buffers = allocated_buffers;
|
|
|
|
ret = call_qop(q, queue_setup, q, NULL, &num_buffers,
|
|
&num_planes, q->plane_sizes, q->alloc_ctx);
|
|
|
|
if (!ret && allocated_buffers < num_buffers)
|
|
ret = -ENOMEM;
|
|
|
|
/*
|
|
* Either the driver has accepted a smaller number of buffers,
|
|
* or .queue_setup() returned an error
|
|
*/
|
|
}
|
|
|
|
mutex_lock(&q->mmap_lock);
|
|
q->num_buffers = allocated_buffers;
|
|
|
|
if (ret < 0) {
|
|
/*
|
|
* Note: __vb2_queue_free() will subtract 'allocated_buffers'
|
|
* from q->num_buffers.
|
|
*/
|
|
__vb2_queue_free(q, allocated_buffers);
|
|
mutex_unlock(&q->mmap_lock);
|
|
return ret;
|
|
}
|
|
mutex_unlock(&q->mmap_lock);
|
|
|
|
/*
|
|
* Return the number of successfully allocated buffers
|
|
* to the userspace.
|
|
*/
|
|
req->count = allocated_buffers;
|
|
q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and
|
|
* type values.
|
|
* @q: videobuf2 queue
|
|
* @req: struct passed from userspace to vidioc_reqbufs handler in driver
|
|
*/
|
|
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
|
|
{
|
|
int ret = __verify_memory_type(q, req->memory, req->type);
|
|
|
|
return ret ? ret : __reqbufs(q, req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_reqbufs);
|
|
|
|
/**
|
|
* __create_bufs() - Allocate buffers and any required auxiliary structs
|
|
* @q: videobuf2 queue
|
|
* @create: creation parameters, passed from userspace to vidioc_create_bufs
|
|
* handler in driver
|
|
*
|
|
* Should be called from vidioc_create_bufs ioctl handler of a driver.
|
|
* This function:
|
|
* 1) verifies parameter sanity
|
|
* 2) calls the .queue_setup() queue operation
|
|
* 3) performs any necessary memory allocations
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_create_bufs handler in driver.
|
|
*/
|
|
static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
|
|
{
|
|
unsigned int num_planes = 0, num_buffers, allocated_buffers;
|
|
int ret;
|
|
|
|
if (q->num_buffers == VIDEO_MAX_FRAME) {
|
|
dprintk(1, "maximum number of buffers already allocated\n");
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
if (!q->num_buffers) {
|
|
memset(q->plane_sizes, 0, sizeof(q->plane_sizes));
|
|
memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx));
|
|
q->memory = create->memory;
|
|
q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type);
|
|
}
|
|
|
|
num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers);
|
|
|
|
/*
|
|
* Ask the driver, whether the requested number of buffers, planes per
|
|
* buffer and their sizes are acceptable
|
|
*/
|
|
ret = call_qop(q, queue_setup, q, &create->format, &num_buffers,
|
|
&num_planes, q->plane_sizes, q->alloc_ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Finally, allocate buffers and video memory */
|
|
allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers,
|
|
num_planes);
|
|
if (allocated_buffers == 0) {
|
|
dprintk(1, "memory allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Check if driver can handle the so far allocated number of buffers.
|
|
*/
|
|
if (allocated_buffers < num_buffers) {
|
|
num_buffers = allocated_buffers;
|
|
|
|
/*
|
|
* q->num_buffers contains the total number of buffers, that the
|
|
* queue driver has set up
|
|
*/
|
|
ret = call_qop(q, queue_setup, q, &create->format, &num_buffers,
|
|
&num_planes, q->plane_sizes, q->alloc_ctx);
|
|
|
|
if (!ret && allocated_buffers < num_buffers)
|
|
ret = -ENOMEM;
|
|
|
|
/*
|
|
* Either the driver has accepted a smaller number of buffers,
|
|
* or .queue_setup() returned an error
|
|
*/
|
|
}
|
|
|
|
mutex_lock(&q->mmap_lock);
|
|
q->num_buffers += allocated_buffers;
|
|
|
|
if (ret < 0) {
|
|
/*
|
|
* Note: __vb2_queue_free() will subtract 'allocated_buffers'
|
|
* from q->num_buffers.
|
|
*/
|
|
__vb2_queue_free(q, allocated_buffers);
|
|
mutex_unlock(&q->mmap_lock);
|
|
return -ENOMEM;
|
|
}
|
|
mutex_unlock(&q->mmap_lock);
|
|
|
|
/*
|
|
* Return the number of successfully allocated buffers
|
|
* to the userspace.
|
|
*/
|
|
create->count = allocated_buffers;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the
|
|
* memory and type values.
|
|
* @q: videobuf2 queue
|
|
* @create: creation parameters, passed from userspace to vidioc_create_bufs
|
|
* handler in driver
|
|
*/
|
|
int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
|
|
{
|
|
int ret = __verify_memory_type(q, create->memory, create->format.type);
|
|
|
|
create->index = q->num_buffers;
|
|
if (create->count == 0)
|
|
return ret != -EBUSY ? ret : 0;
|
|
return ret ? ret : __create_bufs(q, create);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_create_bufs);
|
|
|
|
/**
|
|
* vb2_plane_vaddr() - Return a kernel virtual address of a given plane
|
|
* @vb: vb2_buffer to which the plane in question belongs to
|
|
* @plane_no: plane number for which the address is to be returned
|
|
*
|
|
* This function returns a kernel virtual address of a given plane if
|
|
* such a mapping exist, NULL otherwise.
|
|
*/
|
|
void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no)
|
|
{
|
|
if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv)
|
|
return NULL;
|
|
|
|
return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_plane_vaddr);
|
|
|
|
/**
|
|
* vb2_plane_cookie() - Return allocator specific cookie for the given plane
|
|
* @vb: vb2_buffer to which the plane in question belongs to
|
|
* @plane_no: plane number for which the cookie is to be returned
|
|
*
|
|
* This function returns an allocator specific cookie for a given plane if
|
|
* available, NULL otherwise. The allocator should provide some simple static
|
|
* inline function, which would convert this cookie to the allocator specific
|
|
* type that can be used directly by the driver to access the buffer. This can
|
|
* be for example physical address, pointer to scatter list or IOMMU mapping.
|
|
*/
|
|
void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no)
|
|
{
|
|
if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv)
|
|
return NULL;
|
|
|
|
return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_plane_cookie);
|
|
|
|
/**
|
|
* vb2_buffer_done() - inform videobuf that an operation on a buffer is finished
|
|
* @vb: vb2_buffer returned from the driver
|
|
* @state: either VB2_BUF_STATE_DONE if the operation finished successfully
|
|
* or VB2_BUF_STATE_ERROR if the operation finished with an error.
|
|
* If start_streaming fails then it should return buffers with state
|
|
* VB2_BUF_STATE_QUEUED to put them back into the queue.
|
|
*
|
|
* This function should be called by the driver after a hardware operation on
|
|
* a buffer is finished and the buffer may be returned to userspace. The driver
|
|
* cannot use this buffer anymore until it is queued back to it by videobuf
|
|
* by the means of buf_queue callback. Only buffers previously queued to the
|
|
* driver by buf_queue can be passed to this function.
|
|
*
|
|
* While streaming a buffer can only be returned in state DONE or ERROR.
|
|
* The start_streaming op can also return them in case the DMA engine cannot
|
|
* be started for some reason. In that case the buffers should be returned with
|
|
* state QUEUED.
|
|
*/
|
|
void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
|
|
{
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
unsigned long flags;
|
|
unsigned int plane;
|
|
|
|
if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE))
|
|
return;
|
|
|
|
if (WARN_ON(state != VB2_BUF_STATE_DONE &&
|
|
state != VB2_BUF_STATE_ERROR &&
|
|
state != VB2_BUF_STATE_QUEUED))
|
|
state = VB2_BUF_STATE_ERROR;
|
|
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
/*
|
|
* Although this is not a callback, it still does have to balance
|
|
* with the buf_queue op. So update this counter manually.
|
|
*/
|
|
vb->cnt_buf_done++;
|
|
#endif
|
|
dprintk(4, "done processing on buffer %d, state: %d\n",
|
|
vb->v4l2_buf.index, state);
|
|
|
|
/* sync buffers */
|
|
for (plane = 0; plane < vb->num_planes; ++plane)
|
|
call_void_memop(vb, finish, vb->planes[plane].mem_priv);
|
|
|
|
/* Add the buffer to the done buffers list */
|
|
spin_lock_irqsave(&q->done_lock, flags);
|
|
vb->state = state;
|
|
if (state != VB2_BUF_STATE_QUEUED)
|
|
list_add_tail(&vb->done_entry, &q->done_list);
|
|
atomic_dec(&q->owned_by_drv_count);
|
|
spin_unlock_irqrestore(&q->done_lock, flags);
|
|
|
|
if (state == VB2_BUF_STATE_QUEUED)
|
|
return;
|
|
|
|
/* Inform any processes that may be waiting for buffers */
|
|
wake_up(&q->done_wq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_buffer_done);
|
|
|
|
/**
|
|
* vb2_discard_done() - discard all buffers marked as DONE
|
|
* @q: videobuf2 queue
|
|
*
|
|
* This function is intended to be used with suspend/resume operations. It
|
|
* discards all 'done' buffers as they would be too old to be requested after
|
|
* resume.
|
|
*
|
|
* Drivers must stop the hardware and synchronize with interrupt handlers and/or
|
|
* delayed works before calling this function to make sure no buffer will be
|
|
* touched by the driver and/or hardware.
|
|
*/
|
|
void vb2_discard_done(struct vb2_queue *q)
|
|
{
|
|
struct vb2_buffer *vb;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&q->done_lock, flags);
|
|
list_for_each_entry(vb, &q->done_list, done_entry)
|
|
vb->state = VB2_BUF_STATE_ERROR;
|
|
spin_unlock_irqrestore(&q->done_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_discard_done);
|
|
|
|
/**
|
|
* __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
|
|
* v4l2_buffer by the userspace. The caller has already verified that struct
|
|
* v4l2_buffer has a valid number of planes.
|
|
*/
|
|
static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b,
|
|
struct v4l2_plane *v4l2_planes)
|
|
{
|
|
unsigned int plane;
|
|
|
|
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
|
|
if (WARN_ON_ONCE(b->bytesused == 0)) {
|
|
pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
|
|
if (vb->vb2_queue->allow_zero_bytesused)
|
|
pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
|
|
else
|
|
pr_warn_once("use the actual size instead.\n");
|
|
}
|
|
}
|
|
|
|
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
|
|
if (b->memory == V4L2_MEMORY_USERPTR) {
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
v4l2_planes[plane].m.userptr =
|
|
b->m.planes[plane].m.userptr;
|
|
v4l2_planes[plane].length =
|
|
b->m.planes[plane].length;
|
|
}
|
|
}
|
|
if (b->memory == V4L2_MEMORY_DMABUF) {
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
v4l2_planes[plane].m.fd =
|
|
b->m.planes[plane].m.fd;
|
|
v4l2_planes[plane].length =
|
|
b->m.planes[plane].length;
|
|
}
|
|
}
|
|
|
|
/* Fill in driver-provided information for OUTPUT types */
|
|
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
|
|
/*
|
|
* Will have to go up to b->length when API starts
|
|
* accepting variable number of planes.
|
|
*
|
|
* If bytesused == 0 for the output buffer, then fall
|
|
* back to the full buffer size. In that case
|
|
* userspace clearly never bothered to set it and
|
|
* it's a safe assumption that they really meant to
|
|
* use the full plane sizes.
|
|
*
|
|
* Some drivers, e.g. old codec drivers, use bytesused == 0
|
|
* as a way to indicate that streaming is finished.
|
|
* In that case, the driver should use the
|
|
* allow_zero_bytesused flag to keep old userspace
|
|
* applications working.
|
|
*/
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
struct v4l2_plane *pdst = &v4l2_planes[plane];
|
|
struct v4l2_plane *psrc = &b->m.planes[plane];
|
|
|
|
if (vb->vb2_queue->allow_zero_bytesused)
|
|
pdst->bytesused = psrc->bytesused;
|
|
else
|
|
pdst->bytesused = psrc->bytesused ?
|
|
psrc->bytesused : pdst->length;
|
|
pdst->data_offset = psrc->data_offset;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* Single-planar buffers do not use planes array,
|
|
* so fill in relevant v4l2_buffer struct fields instead.
|
|
* In videobuf we use our internal V4l2_planes struct for
|
|
* single-planar buffers as well, for simplicity.
|
|
*
|
|
* If bytesused == 0 for the output buffer, then fall back
|
|
* to the full buffer size as that's a sensible default.
|
|
*
|
|
* Some drivers, e.g. old codec drivers, use bytesused == 0 as
|
|
* a way to indicate that streaming is finished. In that case,
|
|
* the driver should use the allow_zero_bytesused flag to keep
|
|
* old userspace applications working.
|
|
*/
|
|
if (b->memory == V4L2_MEMORY_USERPTR) {
|
|
v4l2_planes[0].m.userptr = b->m.userptr;
|
|
v4l2_planes[0].length = b->length;
|
|
}
|
|
|
|
if (b->memory == V4L2_MEMORY_DMABUF) {
|
|
v4l2_planes[0].m.fd = b->m.fd;
|
|
v4l2_planes[0].length = b->length;
|
|
}
|
|
|
|
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
|
|
if (vb->vb2_queue->allow_zero_bytesused)
|
|
v4l2_planes[0].bytesused = b->bytesused;
|
|
else
|
|
v4l2_planes[0].bytesused = b->bytesused ?
|
|
b->bytesused : v4l2_planes[0].length;
|
|
} else
|
|
v4l2_planes[0].bytesused = 0;
|
|
|
|
}
|
|
|
|
/* Zero flags that the vb2 core handles */
|
|
vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
|
|
if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
|
|
V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) {
|
|
/*
|
|
* Non-COPY timestamps and non-OUTPUT queues will get
|
|
* their timestamp and timestamp source flags from the
|
|
* queue.
|
|
*/
|
|
vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
|
|
}
|
|
|
|
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
|
|
/*
|
|
* For output buffers mask out the timecode flag:
|
|
* this will be handled later in vb2_internal_qbuf().
|
|
* The 'field' is valid metadata for this output buffer
|
|
* and so that needs to be copied here.
|
|
*/
|
|
vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE;
|
|
vb->v4l2_buf.field = b->field;
|
|
} else {
|
|
/* Zero any output buffer flags as this is a capture buffer */
|
|
vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __qbuf_mmap() - handle qbuf of an MMAP buffer
|
|
*/
|
|
static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
__fill_vb2_buffer(vb, b, vb->v4l2_planes);
|
|
return call_vb_qop(vb, buf_prepare, vb);
|
|
}
|
|
|
|
/**
|
|
* __qbuf_userptr() - handle qbuf of a USERPTR buffer
|
|
*/
|
|
static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
struct v4l2_plane planes[VIDEO_MAX_PLANES];
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
void *mem_priv;
|
|
unsigned int plane;
|
|
int ret;
|
|
enum dma_data_direction dma_dir =
|
|
V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
|
|
bool reacquired = vb->planes[0].mem_priv == NULL;
|
|
|
|
memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
|
|
/* Copy relevant information provided by the userspace */
|
|
__fill_vb2_buffer(vb, b, planes);
|
|
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
/* Skip the plane if already verified */
|
|
if (vb->v4l2_planes[plane].m.userptr &&
|
|
vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr
|
|
&& vb->v4l2_planes[plane].length == planes[plane].length)
|
|
continue;
|
|
|
|
dprintk(3, "userspace address for plane %d changed, "
|
|
"reacquiring memory\n", plane);
|
|
|
|
/* Check if the provided plane buffer is large enough */
|
|
if (planes[plane].length < q->plane_sizes[plane]) {
|
|
dprintk(1, "provided buffer size %u is less than "
|
|
"setup size %u for plane %d\n",
|
|
planes[plane].length,
|
|
q->plane_sizes[plane], plane);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/* Release previously acquired memory if present */
|
|
if (vb->planes[plane].mem_priv) {
|
|
if (!reacquired) {
|
|
reacquired = true;
|
|
call_void_vb_qop(vb, buf_cleanup, vb);
|
|
}
|
|
call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv);
|
|
}
|
|
|
|
vb->planes[plane].mem_priv = NULL;
|
|
memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane));
|
|
|
|
/* Acquire each plane's memory */
|
|
mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane],
|
|
planes[plane].m.userptr,
|
|
planes[plane].length, dma_dir);
|
|
if (IS_ERR_OR_NULL(mem_priv)) {
|
|
dprintk(1, "failed acquiring userspace "
|
|
"memory for plane %d\n", plane);
|
|
ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL;
|
|
goto err;
|
|
}
|
|
vb->planes[plane].mem_priv = mem_priv;
|
|
}
|
|
|
|
/*
|
|
* Now that everything is in order, copy relevant information
|
|
* provided by userspace.
|
|
*/
|
|
for (plane = 0; plane < vb->num_planes; ++plane)
|
|
vb->v4l2_planes[plane] = planes[plane];
|
|
|
|
if (reacquired) {
|
|
/*
|
|
* One or more planes changed, so we must call buf_init to do
|
|
* the driver-specific initialization on the newly acquired
|
|
* buffer, if provided.
|
|
*/
|
|
ret = call_vb_qop(vb, buf_init, vb);
|
|
if (ret) {
|
|
dprintk(1, "buffer initialization failed\n");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ret = call_vb_qop(vb, buf_prepare, vb);
|
|
if (ret) {
|
|
dprintk(1, "buffer preparation failed\n");
|
|
call_void_vb_qop(vb, buf_cleanup, vb);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
/* In case of errors, release planes that were already acquired */
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
if (vb->planes[plane].mem_priv)
|
|
call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv);
|
|
vb->planes[plane].mem_priv = NULL;
|
|
vb->v4l2_planes[plane].m.userptr = 0;
|
|
vb->v4l2_planes[plane].length = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __qbuf_dmabuf() - handle qbuf of a DMABUF buffer
|
|
*/
|
|
static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
struct v4l2_plane planes[VIDEO_MAX_PLANES];
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
void *mem_priv;
|
|
unsigned int plane;
|
|
int ret;
|
|
enum dma_data_direction dma_dir =
|
|
V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
|
|
bool reacquired = vb->planes[0].mem_priv == NULL;
|
|
|
|
memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
|
|
/* Copy relevant information provided by the userspace */
|
|
__fill_vb2_buffer(vb, b, planes);
|
|
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd);
|
|
|
|
if (IS_ERR_OR_NULL(dbuf)) {
|
|
dprintk(1, "invalid dmabuf fd for plane %d\n",
|
|
plane);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/* use DMABUF size if length is not provided */
|
|
if (planes[plane].length == 0)
|
|
planes[plane].length = dbuf->size;
|
|
|
|
if (planes[plane].length < q->plane_sizes[plane]) {
|
|
dprintk(1, "invalid dmabuf length for plane %d\n",
|
|
plane);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/* Skip the plane if already verified */
|
|
if (dbuf == vb->planes[plane].dbuf &&
|
|
vb->v4l2_planes[plane].length == planes[plane].length) {
|
|
dma_buf_put(dbuf);
|
|
continue;
|
|
}
|
|
|
|
dprintk(1, "buffer for plane %d changed\n", plane);
|
|
|
|
if (!reacquired) {
|
|
reacquired = true;
|
|
call_void_vb_qop(vb, buf_cleanup, vb);
|
|
}
|
|
|
|
/* Release previously acquired memory if present */
|
|
__vb2_plane_dmabuf_put(vb, &vb->planes[plane]);
|
|
memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane));
|
|
|
|
/* Acquire each plane's memory */
|
|
mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane],
|
|
dbuf, planes[plane].length, dma_dir);
|
|
if (IS_ERR(mem_priv)) {
|
|
dprintk(1, "failed to attach dmabuf\n");
|
|
ret = PTR_ERR(mem_priv);
|
|
dma_buf_put(dbuf);
|
|
goto err;
|
|
}
|
|
|
|
vb->planes[plane].dbuf = dbuf;
|
|
vb->planes[plane].mem_priv = mem_priv;
|
|
}
|
|
|
|
/* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but
|
|
* really we want to do this just before the DMA, not while queueing
|
|
* the buffer(s)..
|
|
*/
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv);
|
|
if (ret) {
|
|
dprintk(1, "failed to map dmabuf for plane %d\n",
|
|
plane);
|
|
goto err;
|
|
}
|
|
vb->planes[plane].dbuf_mapped = 1;
|
|
}
|
|
|
|
/*
|
|
* Now that everything is in order, copy relevant information
|
|
* provided by userspace.
|
|
*/
|
|
for (plane = 0; plane < vb->num_planes; ++plane)
|
|
vb->v4l2_planes[plane] = planes[plane];
|
|
|
|
if (reacquired) {
|
|
/*
|
|
* Call driver-specific initialization on the newly acquired buffer,
|
|
* if provided.
|
|
*/
|
|
ret = call_vb_qop(vb, buf_init, vb);
|
|
if (ret) {
|
|
dprintk(1, "buffer initialization failed\n");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ret = call_vb_qop(vb, buf_prepare, vb);
|
|
if (ret) {
|
|
dprintk(1, "buffer preparation failed\n");
|
|
call_void_vb_qop(vb, buf_cleanup, vb);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
/* In case of errors, release planes that were already acquired */
|
|
__vb2_buf_dmabuf_put(vb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing
|
|
*/
|
|
static void __enqueue_in_driver(struct vb2_buffer *vb)
|
|
{
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
unsigned int plane;
|
|
|
|
vb->state = VB2_BUF_STATE_ACTIVE;
|
|
atomic_inc(&q->owned_by_drv_count);
|
|
|
|
/* sync buffers */
|
|
for (plane = 0; plane < vb->num_planes; ++plane)
|
|
call_void_memop(vb, prepare, vb->planes[plane].mem_priv);
|
|
|
|
call_void_vb_qop(vb, buf_queue, vb);
|
|
}
|
|
|
|
static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
|
|
{
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
int ret;
|
|
|
|
ret = __verify_length(vb, b);
|
|
if (ret < 0) {
|
|
dprintk(1, "plane parameters verification failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) {
|
|
/*
|
|
* If the format's field is ALTERNATE, then the buffer's field
|
|
* should be either TOP or BOTTOM, not ALTERNATE since that
|
|
* makes no sense. The driver has to know whether the
|
|
* buffer represents a top or a bottom field in order to
|
|
* program any DMA correctly. Using ALTERNATE is wrong, since
|
|
* that just says that it is either a top or a bottom field,
|
|
* but not which of the two it is.
|
|
*/
|
|
dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->error) {
|
|
dprintk(1, "fatal error occurred on queue\n");
|
|
return -EIO;
|
|
}
|
|
|
|
vb->state = VB2_BUF_STATE_PREPARING;
|
|
vb->v4l2_buf.timestamp.tv_sec = 0;
|
|
vb->v4l2_buf.timestamp.tv_usec = 0;
|
|
vb->v4l2_buf.sequence = 0;
|
|
|
|
switch (q->memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
ret = __qbuf_mmap(vb, b);
|
|
break;
|
|
case V4L2_MEMORY_USERPTR:
|
|
down_read(¤t->mm->mmap_sem);
|
|
ret = __qbuf_userptr(vb, b);
|
|
up_read(¤t->mm->mmap_sem);
|
|
break;
|
|
case V4L2_MEMORY_DMABUF:
|
|
ret = __qbuf_dmabuf(vb, b);
|
|
break;
|
|
default:
|
|
WARN(1, "Invalid queue type\n");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (ret)
|
|
dprintk(1, "buffer preparation failed: %d\n", ret);
|
|
vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
|
|
const char *opname)
|
|
{
|
|
if (b->type != q->type) {
|
|
dprintk(1, "%s: invalid buffer type\n", opname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (b->index >= q->num_buffers) {
|
|
dprintk(1, "%s: buffer index out of range\n", opname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->bufs[b->index] == NULL) {
|
|
/* Should never happen */
|
|
dprintk(1, "%s: buffer is NULL\n", opname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (b->memory != q->memory) {
|
|
dprintk(1, "%s: invalid memory type\n", opname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return __verify_planes_array(q->bufs[b->index], b);
|
|
}
|
|
|
|
/**
|
|
* vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel
|
|
* @q: videobuf2 queue
|
|
* @b: buffer structure passed from userspace to vidioc_prepare_buf
|
|
* handler in driver
|
|
*
|
|
* Should be called from vidioc_prepare_buf ioctl handler of a driver.
|
|
* This function:
|
|
* 1) verifies the passed buffer,
|
|
* 2) calls buf_prepare callback in the driver (if provided), in which
|
|
* driver-specific buffer initialization can be performed,
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_prepare_buf handler in driver.
|
|
*/
|
|
int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
struct vb2_buffer *vb;
|
|
int ret;
|
|
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
|
|
if (ret)
|
|
return ret;
|
|
|
|
vb = q->bufs[b->index];
|
|
if (vb->state != VB2_BUF_STATE_DEQUEUED) {
|
|
dprintk(1, "invalid buffer state %d\n",
|
|
vb->state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = __buf_prepare(vb, b);
|
|
if (!ret) {
|
|
/* Fill buffer information for the userspace */
|
|
__fill_v4l2_buffer(vb, b);
|
|
|
|
dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_prepare_buf);
|
|
|
|
/**
|
|
* vb2_start_streaming() - Attempt to start streaming.
|
|
* @q: videobuf2 queue
|
|
*
|
|
* Attempt to start streaming. When this function is called there must be
|
|
* at least q->min_buffers_needed buffers queued up (i.e. the minimum
|
|
* number of buffers required for the DMA engine to function). If the
|
|
* @start_streaming op fails it is supposed to return all the driver-owned
|
|
* buffers back to vb2 in state QUEUED. Check if that happened and if
|
|
* not warn and reclaim them forcefully.
|
|
*/
|
|
static int vb2_start_streaming(struct vb2_queue *q)
|
|
{
|
|
struct vb2_buffer *vb;
|
|
int ret;
|
|
|
|
/*
|
|
* If any buffers were queued before streamon,
|
|
* we can now pass them to driver for processing.
|
|
*/
|
|
list_for_each_entry(vb, &q->queued_list, queued_entry)
|
|
__enqueue_in_driver(vb);
|
|
|
|
/* Tell the driver to start streaming */
|
|
q->start_streaming_called = 1;
|
|
ret = call_qop(q, start_streaming, q,
|
|
atomic_read(&q->owned_by_drv_count));
|
|
if (!ret)
|
|
return 0;
|
|
|
|
q->start_streaming_called = 0;
|
|
|
|
dprintk(1, "driver refused to start streaming\n");
|
|
/*
|
|
* If you see this warning, then the driver isn't cleaning up properly
|
|
* after a failed start_streaming(). See the start_streaming()
|
|
* documentation in videobuf2-core.h for more information how buffers
|
|
* should be returned to vb2 in start_streaming().
|
|
*/
|
|
if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
|
|
unsigned i;
|
|
|
|
/*
|
|
* Forcefully reclaim buffers if the driver did not
|
|
* correctly return them to vb2.
|
|
*/
|
|
for (i = 0; i < q->num_buffers; ++i) {
|
|
vb = q->bufs[i];
|
|
if (vb->state == VB2_BUF_STATE_ACTIVE)
|
|
vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED);
|
|
}
|
|
/* Must be zero now */
|
|
WARN_ON(atomic_read(&q->owned_by_drv_count));
|
|
}
|
|
/*
|
|
* If done_list is not empty, then start_streaming() didn't call
|
|
* vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or
|
|
* STATE_DONE.
|
|
*/
|
|
WARN_ON(!list_empty(&q->done_list));
|
|
return ret;
|
|
}
|
|
|
|
static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
int ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
|
|
struct vb2_buffer *vb;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
vb = q->bufs[b->index];
|
|
|
|
switch (vb->state) {
|
|
case VB2_BUF_STATE_DEQUEUED:
|
|
ret = __buf_prepare(vb, b);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
case VB2_BUF_STATE_PREPARED:
|
|
break;
|
|
case VB2_BUF_STATE_PREPARING:
|
|
dprintk(1, "buffer still being prepared\n");
|
|
return -EINVAL;
|
|
default:
|
|
dprintk(1, "invalid buffer state %d\n", vb->state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Add to the queued buffers list, a buffer will stay on it until
|
|
* dequeued in dqbuf.
|
|
*/
|
|
list_add_tail(&vb->queued_entry, &q->queued_list);
|
|
q->queued_count++;
|
|
q->waiting_for_buffers = false;
|
|
vb->state = VB2_BUF_STATE_QUEUED;
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type)) {
|
|
/*
|
|
* For output buffers copy the timestamp if needed,
|
|
* and the timecode field and flag if needed.
|
|
*/
|
|
if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
|
|
V4L2_BUF_FLAG_TIMESTAMP_COPY)
|
|
vb->v4l2_buf.timestamp = b->timestamp;
|
|
vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
|
|
if (b->flags & V4L2_BUF_FLAG_TIMECODE)
|
|
vb->v4l2_buf.timecode = b->timecode;
|
|
}
|
|
|
|
/*
|
|
* If already streaming, give the buffer to driver for processing.
|
|
* If not, the buffer will be given to driver on next streamon.
|
|
*/
|
|
if (q->start_streaming_called)
|
|
__enqueue_in_driver(vb);
|
|
|
|
/* Fill buffer information for the userspace */
|
|
__fill_v4l2_buffer(vb, b);
|
|
|
|
/*
|
|
* If streamon has been called, and we haven't yet called
|
|
* start_streaming() since not enough buffers were queued, and
|
|
* we now have reached the minimum number of queued buffers,
|
|
* then we can finally call start_streaming().
|
|
*/
|
|
if (q->streaming && !q->start_streaming_called &&
|
|
q->queued_count >= q->min_buffers_needed) {
|
|
ret = vb2_start_streaming(q);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_qbuf() - Queue a buffer from userspace
|
|
* @q: videobuf2 queue
|
|
* @b: buffer structure passed from userspace to vidioc_qbuf handler
|
|
* in driver
|
|
*
|
|
* Should be called from vidioc_qbuf ioctl handler of a driver.
|
|
* This function:
|
|
* 1) verifies the passed buffer,
|
|
* 2) if necessary, calls buf_prepare callback in the driver (if provided), in
|
|
* which driver-specific buffer initialization can be performed,
|
|
* 3) if streaming is on, queues the buffer in driver by the means of buf_queue
|
|
* callback for processing.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_qbuf handler in driver.
|
|
*/
|
|
int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
return vb2_internal_qbuf(q, b);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_qbuf);
|
|
|
|
/**
|
|
* __vb2_wait_for_done_vb() - wait for a buffer to become available
|
|
* for dequeuing
|
|
*
|
|
* Will sleep if required for nonblocking == false.
|
|
*/
|
|
static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
|
|
{
|
|
/*
|
|
* All operations on vb_done_list are performed under done_lock
|
|
* spinlock protection. However, buffers may be removed from
|
|
* it and returned to userspace only while holding both driver's
|
|
* lock and the done_lock spinlock. Thus we can be sure that as
|
|
* long as we hold the driver's lock, the list will remain not
|
|
* empty if list_empty() check succeeds.
|
|
*/
|
|
|
|
for (;;) {
|
|
int ret;
|
|
|
|
if (!q->streaming) {
|
|
dprintk(1, "streaming off, will not wait for buffers\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->error) {
|
|
dprintk(1, "Queue in error state, will not wait for buffers\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (!list_empty(&q->done_list)) {
|
|
/*
|
|
* Found a buffer that we were waiting for.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (nonblocking) {
|
|
dprintk(1, "nonblocking and no buffers to dequeue, "
|
|
"will not wait\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* We are streaming and blocking, wait for another buffer to
|
|
* become ready or for streamoff. Driver's lock is released to
|
|
* allow streamoff or qbuf to be called while waiting.
|
|
*/
|
|
call_void_qop(q, wait_prepare, q);
|
|
|
|
/*
|
|
* All locks have been released, it is safe to sleep now.
|
|
*/
|
|
dprintk(3, "will sleep waiting for buffers\n");
|
|
ret = wait_event_interruptible(q->done_wq,
|
|
!list_empty(&q->done_list) || !q->streaming ||
|
|
q->error);
|
|
|
|
/*
|
|
* We need to reevaluate both conditions again after reacquiring
|
|
* the locks or return an error if one occurred.
|
|
*/
|
|
call_void_qop(q, wait_finish, q);
|
|
if (ret) {
|
|
dprintk(1, "sleep was interrupted\n");
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __vb2_get_done_vb() - get a buffer ready for dequeuing
|
|
*
|
|
* Will sleep if required for nonblocking == false.
|
|
*/
|
|
static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb,
|
|
struct v4l2_buffer *b, int nonblocking)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
/*
|
|
* Wait for at least one buffer to become available on the done_list.
|
|
*/
|
|
ret = __vb2_wait_for_done_vb(q, nonblocking);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Driver's lock has been held since we last verified that done_list
|
|
* is not empty, so no need for another list_empty(done_list) check.
|
|
*/
|
|
spin_lock_irqsave(&q->done_lock, flags);
|
|
*vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry);
|
|
/*
|
|
* Only remove the buffer from done_list if v4l2_buffer can handle all
|
|
* the planes.
|
|
*/
|
|
ret = __verify_planes_array(*vb, b);
|
|
if (!ret)
|
|
list_del(&(*vb)->done_entry);
|
|
spin_unlock_irqrestore(&q->done_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2
|
|
* @q: videobuf2 queue
|
|
*
|
|
* This function will wait until all buffers that have been given to the driver
|
|
* by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call
|
|
* wait_prepare, wait_finish pair. It is intended to be called with all locks
|
|
* taken, for example from stop_streaming() callback.
|
|
*/
|
|
int vb2_wait_for_all_buffers(struct vb2_queue *q)
|
|
{
|
|
if (!q->streaming) {
|
|
dprintk(1, "streaming off, will not wait for buffers\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->start_streaming_called)
|
|
wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count));
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers);
|
|
|
|
/**
|
|
* __vb2_dqbuf() - bring back the buffer to the DEQUEUED state
|
|
*/
|
|
static void __vb2_dqbuf(struct vb2_buffer *vb)
|
|
{
|
|
struct vb2_queue *q = vb->vb2_queue;
|
|
unsigned int i;
|
|
|
|
/* nothing to do if the buffer is already dequeued */
|
|
if (vb->state == VB2_BUF_STATE_DEQUEUED)
|
|
return;
|
|
|
|
vb->state = VB2_BUF_STATE_DEQUEUED;
|
|
|
|
/* unmap DMABUF buffer */
|
|
if (q->memory == V4L2_MEMORY_DMABUF)
|
|
for (i = 0; i < vb->num_planes; ++i) {
|
|
if (!vb->planes[i].dbuf_mapped)
|
|
continue;
|
|
call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv);
|
|
vb->planes[i].dbuf_mapped = 0;
|
|
}
|
|
}
|
|
|
|
static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
|
|
{
|
|
struct vb2_buffer *vb = NULL;
|
|
int ret;
|
|
|
|
if (b->type != q->type) {
|
|
dprintk(1, "invalid buffer type\n");
|
|
return -EINVAL;
|
|
}
|
|
ret = __vb2_get_done_vb(q, &vb, b, nonblocking);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (vb->state) {
|
|
case VB2_BUF_STATE_DONE:
|
|
dprintk(3, "returning done buffer\n");
|
|
break;
|
|
case VB2_BUF_STATE_ERROR:
|
|
dprintk(3, "returning done buffer with errors\n");
|
|
break;
|
|
default:
|
|
dprintk(1, "invalid buffer state\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
call_void_vb_qop(vb, buf_finish, vb);
|
|
|
|
/* Fill buffer information for the userspace */
|
|
__fill_v4l2_buffer(vb, b);
|
|
/* Remove from videobuf queue */
|
|
list_del(&vb->queued_entry);
|
|
q->queued_count--;
|
|
/* go back to dequeued state */
|
|
__vb2_dqbuf(vb);
|
|
|
|
dprintk(1, "dqbuf of buffer %d, with state %d\n",
|
|
vb->v4l2_buf.index, vb->state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_dqbuf() - Dequeue a buffer to the userspace
|
|
* @q: videobuf2 queue
|
|
* @b: buffer structure passed from userspace to vidioc_dqbuf handler
|
|
* in driver
|
|
* @nonblocking: if true, this call will not sleep waiting for a buffer if no
|
|
* buffers ready for dequeuing are present. Normally the driver
|
|
* would be passing (file->f_flags & O_NONBLOCK) here
|
|
*
|
|
* Should be called from vidioc_dqbuf ioctl handler of a driver.
|
|
* This function:
|
|
* 1) verifies the passed buffer,
|
|
* 2) calls buf_finish callback in the driver (if provided), in which
|
|
* driver can perform any additional operations that may be required before
|
|
* returning the buffer to userspace, such as cache sync,
|
|
* 3) the buffer struct members are filled with relevant information for
|
|
* the userspace.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_dqbuf handler in driver.
|
|
*/
|
|
int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return vb2_internal_dqbuf(q, b, nonblocking);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_dqbuf);
|
|
|
|
/**
|
|
* __vb2_queue_cancel() - cancel and stop (pause) streaming
|
|
*
|
|
* Removes all queued buffers from driver's queue and all buffers queued by
|
|
* userspace from videobuf's queue. Returns to state after reqbufs.
|
|
*/
|
|
static void __vb2_queue_cancel(struct vb2_queue *q)
|
|
{
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Tell driver to stop all transactions and release all queued
|
|
* buffers.
|
|
*/
|
|
if (q->start_streaming_called)
|
|
call_void_qop(q, stop_streaming, q);
|
|
|
|
/*
|
|
* If you see this warning, then the driver isn't cleaning up properly
|
|
* in stop_streaming(). See the stop_streaming() documentation in
|
|
* videobuf2-core.h for more information how buffers should be returned
|
|
* to vb2 in stop_streaming().
|
|
*/
|
|
if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
|
|
for (i = 0; i < q->num_buffers; ++i)
|
|
if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE)
|
|
vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR);
|
|
/* Must be zero now */
|
|
WARN_ON(atomic_read(&q->owned_by_drv_count));
|
|
}
|
|
|
|
q->streaming = 0;
|
|
q->start_streaming_called = 0;
|
|
q->queued_count = 0;
|
|
q->error = 0;
|
|
|
|
/*
|
|
* Remove all buffers from videobuf's list...
|
|
*/
|
|
INIT_LIST_HEAD(&q->queued_list);
|
|
/*
|
|
* ...and done list; userspace will not receive any buffers it
|
|
* has not already dequeued before initiating cancel.
|
|
*/
|
|
INIT_LIST_HEAD(&q->done_list);
|
|
atomic_set(&q->owned_by_drv_count, 0);
|
|
wake_up_all(&q->done_wq);
|
|
|
|
/*
|
|
* Reinitialize all buffers for next use.
|
|
* Make sure to call buf_finish for any queued buffers. Normally
|
|
* that's done in dqbuf, but that's not going to happen when we
|
|
* cancel the whole queue. Note: this code belongs here, not in
|
|
* __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical
|
|
* call to __fill_v4l2_buffer() after buf_finish(). That order can't
|
|
* be changed, so we can't move the buf_finish() to __vb2_dqbuf().
|
|
*/
|
|
for (i = 0; i < q->num_buffers; ++i) {
|
|
struct vb2_buffer *vb = q->bufs[i];
|
|
|
|
if (vb->state != VB2_BUF_STATE_DEQUEUED) {
|
|
vb->state = VB2_BUF_STATE_PREPARED;
|
|
call_void_vb_qop(vb, buf_finish, vb);
|
|
}
|
|
__vb2_dqbuf(vb);
|
|
}
|
|
}
|
|
|
|
static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
int ret;
|
|
|
|
if (type != q->type) {
|
|
dprintk(1, "invalid stream type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->streaming) {
|
|
dprintk(3, "already streaming\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!q->num_buffers) {
|
|
dprintk(1, "no buffers have been allocated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (q->num_buffers < q->min_buffers_needed) {
|
|
dprintk(1, "need at least %u allocated buffers\n",
|
|
q->min_buffers_needed);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Tell driver to start streaming provided sufficient buffers
|
|
* are available.
|
|
*/
|
|
if (q->queued_count >= q->min_buffers_needed) {
|
|
ret = vb2_start_streaming(q);
|
|
if (ret) {
|
|
__vb2_queue_cancel(q);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
q->streaming = 1;
|
|
|
|
dprintk(3, "successful\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_queue_error() - signal a fatal error on the queue
|
|
* @q: videobuf2 queue
|
|
*
|
|
* Flag that a fatal unrecoverable error has occurred and wake up all processes
|
|
* waiting on the queue. Polling will now set POLLERR and queuing and dequeuing
|
|
* buffers will return -EIO.
|
|
*
|
|
* The error flag will be cleared when cancelling the queue, either from
|
|
* vb2_streamoff or vb2_queue_release. Drivers should thus not call this
|
|
* function before starting the stream, otherwise the error flag will remain set
|
|
* until the queue is released when closing the device node.
|
|
*/
|
|
void vb2_queue_error(struct vb2_queue *q)
|
|
{
|
|
q->error = 1;
|
|
|
|
wake_up_all(&q->done_wq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_queue_error);
|
|
|
|
/**
|
|
* vb2_streamon - start streaming
|
|
* @q: videobuf2 queue
|
|
* @type: type argument passed from userspace to vidioc_streamon handler
|
|
*
|
|
* Should be called from vidioc_streamon handler of a driver.
|
|
* This function:
|
|
* 1) verifies current state
|
|
* 2) passes any previously queued buffers to the driver and starts streaming
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_streamon handler in the driver.
|
|
*/
|
|
int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return vb2_internal_streamon(q, type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_streamon);
|
|
|
|
static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
if (type != q->type) {
|
|
dprintk(1, "invalid stream type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Cancel will pause streaming and remove all buffers from the driver
|
|
* and videobuf, effectively returning control over them to userspace.
|
|
*
|
|
* Note that we do this even if q->streaming == 0: if you prepare or
|
|
* queue buffers, and then call streamoff without ever having called
|
|
* streamon, you would still expect those buffers to be returned to
|
|
* their normal dequeued state.
|
|
*/
|
|
__vb2_queue_cancel(q);
|
|
q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type);
|
|
|
|
dprintk(3, "successful\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_streamoff - stop streaming
|
|
* @q: videobuf2 queue
|
|
* @type: type argument passed from userspace to vidioc_streamoff handler
|
|
*
|
|
* Should be called from vidioc_streamoff handler of a driver.
|
|
* This function:
|
|
* 1) verifies current state,
|
|
* 2) stop streaming and dequeues any queued buffers, including those previously
|
|
* passed to the driver (after waiting for the driver to finish).
|
|
*
|
|
* This call can be used for pausing playback.
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_streamoff handler in the driver
|
|
*/
|
|
int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return vb2_internal_streamoff(q, type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_streamoff);
|
|
|
|
/**
|
|
* __find_plane_by_offset() - find plane associated with the given offset off
|
|
*/
|
|
static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off,
|
|
unsigned int *_buffer, unsigned int *_plane)
|
|
{
|
|
struct vb2_buffer *vb;
|
|
unsigned int buffer, plane;
|
|
|
|
/*
|
|
* Go over all buffers and their planes, comparing the given offset
|
|
* with an offset assigned to each plane. If a match is found,
|
|
* return its buffer and plane numbers.
|
|
*/
|
|
for (buffer = 0; buffer < q->num_buffers; ++buffer) {
|
|
vb = q->bufs[buffer];
|
|
|
|
for (plane = 0; plane < vb->num_planes; ++plane) {
|
|
if (vb->v4l2_planes[plane].m.mem_offset == off) {
|
|
*_buffer = buffer;
|
|
*_plane = plane;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* vb2_expbuf() - Export a buffer as a file descriptor
|
|
* @q: videobuf2 queue
|
|
* @eb: export buffer structure passed from userspace to vidioc_expbuf
|
|
* handler in driver
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from vidioc_expbuf handler in driver.
|
|
*/
|
|
int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)
|
|
{
|
|
struct vb2_buffer *vb = NULL;
|
|
struct vb2_plane *vb_plane;
|
|
int ret;
|
|
struct dma_buf *dbuf;
|
|
|
|
if (q->memory != V4L2_MEMORY_MMAP) {
|
|
dprintk(1, "queue is not currently set up for mmap\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!q->mem_ops->get_dmabuf) {
|
|
dprintk(1, "queue does not support DMA buffer exporting\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) {
|
|
dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (eb->type != q->type) {
|
|
dprintk(1, "invalid buffer type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (eb->index >= q->num_buffers) {
|
|
dprintk(1, "buffer index out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
vb = q->bufs[eb->index];
|
|
|
|
if (eb->plane >= vb->num_planes) {
|
|
dprintk(1, "buffer plane out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "expbuf: file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
vb_plane = &vb->planes[eb->plane];
|
|
|
|
dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE);
|
|
if (IS_ERR_OR_NULL(dbuf)) {
|
|
dprintk(1, "failed to export buffer %d, plane %d\n",
|
|
eb->index, eb->plane);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE);
|
|
if (ret < 0) {
|
|
dprintk(3, "buffer %d, plane %d failed to export (%d)\n",
|
|
eb->index, eb->plane, ret);
|
|
dma_buf_put(dbuf);
|
|
return ret;
|
|
}
|
|
|
|
dprintk(3, "buffer %d, plane %d exported as %d descriptor\n",
|
|
eb->index, eb->plane, ret);
|
|
eb->fd = ret;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_expbuf);
|
|
|
|
/**
|
|
* vb2_mmap() - map video buffers into application address space
|
|
* @q: videobuf2 queue
|
|
* @vma: vma passed to the mmap file operation handler in the driver
|
|
*
|
|
* Should be called from mmap file operation handler of a driver.
|
|
* This function maps one plane of one of the available video buffers to
|
|
* userspace. To map whole video memory allocated on reqbufs, this function
|
|
* has to be called once per each plane per each buffer previously allocated.
|
|
*
|
|
* When the userspace application calls mmap, it passes to it an offset returned
|
|
* to it earlier by the means of vidioc_querybuf handler. That offset acts as
|
|
* a "cookie", which is then used to identify the plane to be mapped.
|
|
* This function finds a plane with a matching offset and a mapping is performed
|
|
* by the means of a provided memory operation.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from the mmap handler in driver.
|
|
*/
|
|
int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
|
|
{
|
|
unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
|
|
struct vb2_buffer *vb;
|
|
unsigned int buffer = 0, plane = 0;
|
|
int ret;
|
|
unsigned long length;
|
|
|
|
if (q->memory != V4L2_MEMORY_MMAP) {
|
|
dprintk(1, "queue is not currently set up for mmap\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check memory area access mode.
|
|
*/
|
|
if (!(vma->vm_flags & VM_SHARED)) {
|
|
dprintk(1, "invalid vma flags, VM_SHARED needed\n");
|
|
return -EINVAL;
|
|
}
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type)) {
|
|
if (!(vma->vm_flags & VM_WRITE)) {
|
|
dprintk(1, "invalid vma flags, VM_WRITE needed\n");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
if (!(vma->vm_flags & VM_READ)) {
|
|
dprintk(1, "invalid vma flags, VM_READ needed\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "mmap: file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/*
|
|
* Find the plane corresponding to the offset passed by userspace.
|
|
*/
|
|
ret = __find_plane_by_offset(q, off, &buffer, &plane);
|
|
if (ret)
|
|
return ret;
|
|
|
|
vb = q->bufs[buffer];
|
|
|
|
/*
|
|
* MMAP requires page_aligned buffers.
|
|
* The buffer length was page_aligned at __vb2_buf_mem_alloc(),
|
|
* so, we need to do the same here.
|
|
*/
|
|
length = PAGE_ALIGN(vb->v4l2_planes[plane].length);
|
|
if (length < (vma->vm_end - vma->vm_start)) {
|
|
dprintk(1,
|
|
"MMAP invalid, as it would overflow buffer length\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&q->mmap_lock);
|
|
ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma);
|
|
mutex_unlock(&q->mmap_lock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_mmap);
|
|
|
|
#ifndef CONFIG_MMU
|
|
unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
|
|
unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long off = pgoff << PAGE_SHIFT;
|
|
struct vb2_buffer *vb;
|
|
unsigned int buffer, plane;
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
if (q->memory != V4L2_MEMORY_MMAP) {
|
|
dprintk(1, "queue is not currently set up for mmap\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Find the plane corresponding to the offset passed by userspace.
|
|
*/
|
|
ret = __find_plane_by_offset(q, off, &buffer, &plane);
|
|
if (ret)
|
|
return ret;
|
|
|
|
vb = q->bufs[buffer];
|
|
|
|
vaddr = vb2_plane_vaddr(vb, plane);
|
|
return vaddr ? (unsigned long)vaddr : -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_get_unmapped_area);
|
|
#endif
|
|
|
|
static int __vb2_init_fileio(struct vb2_queue *q, int read);
|
|
static int __vb2_cleanup_fileio(struct vb2_queue *q);
|
|
|
|
/**
|
|
* vb2_poll() - implements poll userspace operation
|
|
* @q: videobuf2 queue
|
|
* @file: file argument passed to the poll file operation handler
|
|
* @wait: wait argument passed to the poll file operation handler
|
|
*
|
|
* This function implements poll file operation handler for a driver.
|
|
* For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will
|
|
* be informed that the file descriptor of a video device is available for
|
|
* reading.
|
|
* For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor
|
|
* will be reported as available for writing.
|
|
*
|
|
* If the driver uses struct v4l2_fh, then vb2_poll() will also check for any
|
|
* pending events.
|
|
*
|
|
* The return values from this function are intended to be directly returned
|
|
* from poll handler in driver.
|
|
*/
|
|
unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
|
|
{
|
|
struct video_device *vfd = video_devdata(file);
|
|
unsigned long req_events = poll_requested_events(wait);
|
|
struct vb2_buffer *vb = NULL;
|
|
unsigned int res = 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))
|
|
res = POLLPRI;
|
|
else if (req_events & POLLPRI)
|
|
poll_wait(file, &fh->wait, wait);
|
|
}
|
|
|
|
if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM)))
|
|
return res;
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM)))
|
|
return res;
|
|
|
|
/*
|
|
* Start file I/O emulator only if streaming API has not been used yet.
|
|
*/
|
|
if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) {
|
|
if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) &&
|
|
(req_events & (POLLIN | POLLRDNORM))) {
|
|
if (__vb2_init_fileio(q, 1))
|
|
return res | POLLERR;
|
|
}
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) &&
|
|
(req_events & (POLLOUT | POLLWRNORM))) {
|
|
if (__vb2_init_fileio(q, 0))
|
|
return res | POLLERR;
|
|
/*
|
|
* Write to OUTPUT queue can be done immediately.
|
|
*/
|
|
return res | POLLOUT | POLLWRNORM;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* There is nothing to wait for if the queue isn't streaming, or if the
|
|
* error flag is set.
|
|
*/
|
|
if (!vb2_is_streaming(q) || q->error)
|
|
return res | POLLERR;
|
|
/*
|
|
* For compatibility with vb1: if QBUF hasn't been called yet, then
|
|
* return POLLERR as well. This only affects capture queues, output
|
|
* queues will always initialize waiting_for_buffers to false.
|
|
*/
|
|
if (q->waiting_for_buffers)
|
|
return res | POLLERR;
|
|
|
|
/*
|
|
* For output streams you can write as long as there are fewer buffers
|
|
* queued than there are buffers available.
|
|
*/
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers)
|
|
return res | POLLOUT | POLLWRNORM;
|
|
|
|
if (list_empty(&q->done_list))
|
|
poll_wait(file, &q->done_wq, wait);
|
|
|
|
/*
|
|
* Take first buffer available for dequeuing.
|
|
*/
|
|
spin_lock_irqsave(&q->done_lock, flags);
|
|
if (!list_empty(&q->done_list))
|
|
vb = list_first_entry(&q->done_list, struct vb2_buffer,
|
|
done_entry);
|
|
spin_unlock_irqrestore(&q->done_lock, flags);
|
|
|
|
if (vb && (vb->state == VB2_BUF_STATE_DONE
|
|
|| vb->state == VB2_BUF_STATE_ERROR)) {
|
|
return (V4L2_TYPE_IS_OUTPUT(q->type)) ?
|
|
res | POLLOUT | POLLWRNORM :
|
|
res | POLLIN | POLLRDNORM;
|
|
}
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_poll);
|
|
|
|
/**
|
|
* vb2_queue_init() - initialize a videobuf2 queue
|
|
* @q: videobuf2 queue; this structure should be allocated in driver
|
|
*
|
|
* The vb2_queue structure should be allocated by the driver. The driver is
|
|
* responsible of clearing it's content and setting initial values for some
|
|
* required entries before calling this function.
|
|
* q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer
|
|
* to the struct vb2_queue description in include/media/videobuf2-core.h
|
|
* for more information.
|
|
*/
|
|
int vb2_queue_init(struct vb2_queue *q)
|
|
{
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
if (WARN_ON(!q) ||
|
|
WARN_ON(!q->ops) ||
|
|
WARN_ON(!q->mem_ops) ||
|
|
WARN_ON(!q->type) ||
|
|
WARN_ON(!q->io_modes) ||
|
|
WARN_ON(!q->ops->queue_setup) ||
|
|
WARN_ON(!q->ops->buf_queue) ||
|
|
WARN_ON(q->timestamp_flags &
|
|
~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
|
|
V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
|
|
return -EINVAL;
|
|
|
|
/* Warn that the driver should choose an appropriate timestamp type */
|
|
WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
|
|
V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
|
|
|
|
INIT_LIST_HEAD(&q->queued_list);
|
|
INIT_LIST_HEAD(&q->done_list);
|
|
spin_lock_init(&q->done_lock);
|
|
mutex_init(&q->mmap_lock);
|
|
init_waitqueue_head(&q->done_wq);
|
|
|
|
if (q->buf_struct_size == 0)
|
|
q->buf_struct_size = sizeof(struct vb2_buffer);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_queue_init);
|
|
|
|
/**
|
|
* vb2_queue_release() - stop streaming, release the queue and free memory
|
|
* @q: videobuf2 queue
|
|
*
|
|
* This function stops streaming and performs necessary clean ups, including
|
|
* freeing video buffer memory. The driver is responsible for freeing
|
|
* the vb2_queue structure itself.
|
|
*/
|
|
void vb2_queue_release(struct vb2_queue *q)
|
|
{
|
|
__vb2_cleanup_fileio(q);
|
|
__vb2_queue_cancel(q);
|
|
mutex_lock(&q->mmap_lock);
|
|
__vb2_queue_free(q, q->num_buffers);
|
|
mutex_unlock(&q->mmap_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_queue_release);
|
|
|
|
/**
|
|
* struct vb2_fileio_buf - buffer context used by file io emulator
|
|
*
|
|
* vb2 provides a compatibility layer and emulator of file io (read and
|
|
* write) calls on top of streaming API. This structure is used for
|
|
* tracking context related to the buffers.
|
|
*/
|
|
struct vb2_fileio_buf {
|
|
void *vaddr;
|
|
unsigned int size;
|
|
unsigned int pos;
|
|
unsigned int queued:1;
|
|
};
|
|
|
|
/**
|
|
* struct vb2_fileio_data - queue context used by file io emulator
|
|
*
|
|
* @cur_index: the index of the buffer currently being read from or
|
|
* written to. If equal to q->num_buffers then a new buffer
|
|
* must be dequeued.
|
|
* @initial_index: in the read() case all buffers are queued up immediately
|
|
* in __vb2_init_fileio() and __vb2_perform_fileio() just cycles
|
|
* buffers. However, in the write() case no buffers are initially
|
|
* queued, instead whenever a buffer is full it is queued up by
|
|
* __vb2_perform_fileio(). Only once all available buffers have
|
|
* been queued up will __vb2_perform_fileio() start to dequeue
|
|
* buffers. This means that initially __vb2_perform_fileio()
|
|
* needs to know what buffer index to use when it is queuing up
|
|
* the buffers for the first time. That initial index is stored
|
|
* in this field. Once it is equal to q->num_buffers all
|
|
* available buffers have been queued and __vb2_perform_fileio()
|
|
* should start the normal dequeue/queue cycle.
|
|
*
|
|
* vb2 provides a compatibility layer and emulator of file io (read and
|
|
* write) calls on top of streaming API. For proper operation it required
|
|
* this structure to save the driver state between each call of the read
|
|
* or write function.
|
|
*/
|
|
struct vb2_fileio_data {
|
|
struct v4l2_requestbuffers req;
|
|
struct v4l2_plane p;
|
|
struct v4l2_buffer b;
|
|
struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME];
|
|
unsigned int cur_index;
|
|
unsigned int initial_index;
|
|
unsigned int q_count;
|
|
unsigned int dq_count;
|
|
unsigned read_once:1;
|
|
unsigned write_immediately:1;
|
|
};
|
|
|
|
/**
|
|
* __vb2_init_fileio() - initialize file io emulator
|
|
* @q: videobuf2 queue
|
|
* @read: mode selector (1 means read, 0 means write)
|
|
*/
|
|
static int __vb2_init_fileio(struct vb2_queue *q, int read)
|
|
{
|
|
struct vb2_fileio_data *fileio;
|
|
int i, ret;
|
|
unsigned int count = 0;
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
if (WARN_ON((read && !(q->io_modes & VB2_READ)) ||
|
|
(!read && !(q->io_modes & VB2_WRITE))))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Check if device supports mapping buffers to kernel virtual space.
|
|
*/
|
|
if (!q->mem_ops->vaddr)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* Check if streaming api has not been already activated.
|
|
*/
|
|
if (q->streaming || q->num_buffers > 0)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* Start with count 1, driver can increase it in queue_setup()
|
|
*/
|
|
count = 1;
|
|
|
|
dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n",
|
|
(read) ? "read" : "write", count, q->fileio_read_once,
|
|
q->fileio_write_immediately);
|
|
|
|
fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL);
|
|
if (fileio == NULL)
|
|
return -ENOMEM;
|
|
|
|
fileio->read_once = q->fileio_read_once;
|
|
fileio->write_immediately = q->fileio_write_immediately;
|
|
|
|
/*
|
|
* Request buffers and use MMAP type to force driver
|
|
* to allocate buffers by itself.
|
|
*/
|
|
fileio->req.count = count;
|
|
fileio->req.memory = V4L2_MEMORY_MMAP;
|
|
fileio->req.type = q->type;
|
|
q->fileio = fileio;
|
|
ret = __reqbufs(q, &fileio->req);
|
|
if (ret)
|
|
goto err_kfree;
|
|
|
|
/*
|
|
* Check if plane_count is correct
|
|
* (multiplane buffers are not supported).
|
|
*/
|
|
if (q->bufs[0]->num_planes != 1) {
|
|
ret = -EBUSY;
|
|
goto err_reqbufs;
|
|
}
|
|
|
|
/*
|
|
* Get kernel address of each buffer.
|
|
*/
|
|
for (i = 0; i < q->num_buffers; i++) {
|
|
fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0);
|
|
if (fileio->bufs[i].vaddr == NULL) {
|
|
ret = -EINVAL;
|
|
goto err_reqbufs;
|
|
}
|
|
fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0);
|
|
}
|
|
|
|
/*
|
|
* Read mode requires pre queuing of all buffers.
|
|
*/
|
|
if (read) {
|
|
bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
|
|
|
|
/*
|
|
* Queue all buffers.
|
|
*/
|
|
for (i = 0; i < q->num_buffers; i++) {
|
|
struct v4l2_buffer *b = &fileio->b;
|
|
|
|
memset(b, 0, sizeof(*b));
|
|
b->type = q->type;
|
|
if (is_multiplanar) {
|
|
memset(&fileio->p, 0, sizeof(fileio->p));
|
|
b->m.planes = &fileio->p;
|
|
b->length = 1;
|
|
}
|
|
b->memory = q->memory;
|
|
b->index = i;
|
|
ret = vb2_internal_qbuf(q, b);
|
|
if (ret)
|
|
goto err_reqbufs;
|
|
fileio->bufs[i].queued = 1;
|
|
}
|
|
/*
|
|
* All buffers have been queued, so mark that by setting
|
|
* initial_index to q->num_buffers
|
|
*/
|
|
fileio->initial_index = q->num_buffers;
|
|
fileio->cur_index = q->num_buffers;
|
|
}
|
|
|
|
/*
|
|
* Start streaming.
|
|
*/
|
|
ret = vb2_internal_streamon(q, q->type);
|
|
if (ret)
|
|
goto err_reqbufs;
|
|
|
|
return ret;
|
|
|
|
err_reqbufs:
|
|
fileio->req.count = 0;
|
|
__reqbufs(q, &fileio->req);
|
|
|
|
err_kfree:
|
|
q->fileio = NULL;
|
|
kfree(fileio);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __vb2_cleanup_fileio() - free resourced used by file io emulator
|
|
* @q: videobuf2 queue
|
|
*/
|
|
static int __vb2_cleanup_fileio(struct vb2_queue *q)
|
|
{
|
|
struct vb2_fileio_data *fileio = q->fileio;
|
|
|
|
if (fileio) {
|
|
vb2_internal_streamoff(q, q->type);
|
|
q->fileio = NULL;
|
|
fileio->req.count = 0;
|
|
vb2_reqbufs(q, &fileio->req);
|
|
kfree(fileio);
|
|
dprintk(3, "file io emulator closed\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __vb2_perform_fileio() - perform a single file io (read or write) operation
|
|
* @q: videobuf2 queue
|
|
* @data: pointed to target userspace buffer
|
|
* @count: number of bytes to read or write
|
|
* @ppos: file handle position tracking pointer
|
|
* @nonblock: mode selector (1 means blocking calls, 0 means nonblocking)
|
|
* @read: access mode selector (1 means read, 0 means write)
|
|
*/
|
|
static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count,
|
|
loff_t *ppos, int nonblock, int read)
|
|
{
|
|
struct vb2_fileio_data *fileio;
|
|
struct vb2_fileio_buf *buf;
|
|
bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
|
|
/*
|
|
* When using write() to write data to an output video node the vb2 core
|
|
* should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody
|
|
* else is able to provide this information with the write() operation.
|
|
*/
|
|
bool set_timestamp = !read &&
|
|
(q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
|
|
V4L2_BUF_FLAG_TIMESTAMP_COPY;
|
|
int ret, index;
|
|
|
|
dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n",
|
|
read ? "read" : "write", (long)*ppos, count,
|
|
nonblock ? "non" : "");
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Initialize emulator on first call.
|
|
*/
|
|
if (!vb2_fileio_is_active(q)) {
|
|
ret = __vb2_init_fileio(q, read);
|
|
dprintk(3, "vb2_init_fileio result: %d\n", ret);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
fileio = q->fileio;
|
|
|
|
/*
|
|
* Check if we need to dequeue the buffer.
|
|
*/
|
|
index = fileio->cur_index;
|
|
if (index >= q->num_buffers) {
|
|
/*
|
|
* Call vb2_dqbuf to get buffer back.
|
|
*/
|
|
memset(&fileio->b, 0, sizeof(fileio->b));
|
|
fileio->b.type = q->type;
|
|
fileio->b.memory = q->memory;
|
|
if (is_multiplanar) {
|
|
memset(&fileio->p, 0, sizeof(fileio->p));
|
|
fileio->b.m.planes = &fileio->p;
|
|
fileio->b.length = 1;
|
|
}
|
|
ret = vb2_internal_dqbuf(q, &fileio->b, nonblock);
|
|
dprintk(5, "vb2_dqbuf result: %d\n", ret);
|
|
if (ret)
|
|
return ret;
|
|
fileio->dq_count += 1;
|
|
|
|
fileio->cur_index = index = fileio->b.index;
|
|
buf = &fileio->bufs[index];
|
|
|
|
/*
|
|
* Get number of bytes filled by the driver
|
|
*/
|
|
buf->pos = 0;
|
|
buf->queued = 0;
|
|
buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0)
|
|
: vb2_plane_size(q->bufs[index], 0);
|
|
/* Compensate for data_offset on read in the multiplanar case. */
|
|
if (is_multiplanar && read &&
|
|
fileio->b.m.planes[0].data_offset < buf->size) {
|
|
buf->pos = fileio->b.m.planes[0].data_offset;
|
|
buf->size -= buf->pos;
|
|
}
|
|
} else {
|
|
buf = &fileio->bufs[index];
|
|
}
|
|
|
|
/*
|
|
* Limit count on last few bytes of the buffer.
|
|
*/
|
|
if (buf->pos + count > buf->size) {
|
|
count = buf->size - buf->pos;
|
|
dprintk(5, "reducing read count: %zd\n", count);
|
|
}
|
|
|
|
/*
|
|
* Transfer data to userspace.
|
|
*/
|
|
dprintk(3, "copying %zd bytes - buffer %d, offset %u\n",
|
|
count, index, buf->pos);
|
|
if (read)
|
|
ret = copy_to_user(data, buf->vaddr + buf->pos, count);
|
|
else
|
|
ret = copy_from_user(buf->vaddr + buf->pos, data, count);
|
|
if (ret) {
|
|
dprintk(3, "error copying data\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
/*
|
|
* Update counters.
|
|
*/
|
|
buf->pos += count;
|
|
*ppos += count;
|
|
|
|
/*
|
|
* Queue next buffer if required.
|
|
*/
|
|
if (buf->pos == buf->size || (!read && fileio->write_immediately)) {
|
|
/*
|
|
* Check if this is the last buffer to read.
|
|
*/
|
|
if (read && fileio->read_once && fileio->dq_count == 1) {
|
|
dprintk(3, "read limit reached\n");
|
|
return __vb2_cleanup_fileio(q);
|
|
}
|
|
|
|
/*
|
|
* Call vb2_qbuf and give buffer to the driver.
|
|
*/
|
|
memset(&fileio->b, 0, sizeof(fileio->b));
|
|
fileio->b.type = q->type;
|
|
fileio->b.memory = q->memory;
|
|
fileio->b.index = index;
|
|
fileio->b.bytesused = buf->pos;
|
|
if (is_multiplanar) {
|
|
memset(&fileio->p, 0, sizeof(fileio->p));
|
|
fileio->p.bytesused = buf->pos;
|
|
fileio->b.m.planes = &fileio->p;
|
|
fileio->b.length = 1;
|
|
}
|
|
if (set_timestamp)
|
|
v4l2_get_timestamp(&fileio->b.timestamp);
|
|
ret = vb2_internal_qbuf(q, &fileio->b);
|
|
dprintk(5, "vb2_dbuf result: %d\n", ret);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Buffer has been queued, update the status
|
|
*/
|
|
buf->pos = 0;
|
|
buf->queued = 1;
|
|
buf->size = vb2_plane_size(q->bufs[index], 0);
|
|
fileio->q_count += 1;
|
|
/*
|
|
* If we are queuing up buffers for the first time, then
|
|
* increase initial_index by one.
|
|
*/
|
|
if (fileio->initial_index < q->num_buffers)
|
|
fileio->initial_index++;
|
|
/*
|
|
* The next buffer to use is either a buffer that's going to be
|
|
* queued for the first time (initial_index < q->num_buffers)
|
|
* or it is equal to q->num_buffers, meaning that the next
|
|
* time we need to dequeue a buffer since we've now queued up
|
|
* all the 'first time' buffers.
|
|
*/
|
|
fileio->cur_index = fileio->initial_index;
|
|
}
|
|
|
|
/*
|
|
* Return proper number of bytes processed.
|
|
*/
|
|
if (ret == 0)
|
|
ret = count;
|
|
return ret;
|
|
}
|
|
|
|
size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
|
|
loff_t *ppos, int nonblocking)
|
|
{
|
|
return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_read);
|
|
|
|
size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
|
|
loff_t *ppos, int nonblocking)
|
|
{
|
|
return __vb2_perform_fileio(q, (char __user *) data, count,
|
|
ppos, nonblocking, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_write);
|
|
|
|
struct vb2_threadio_data {
|
|
struct task_struct *thread;
|
|
vb2_thread_fnc fnc;
|
|
void *priv;
|
|
bool stop;
|
|
};
|
|
|
|
static int vb2_thread(void *data)
|
|
{
|
|
struct vb2_queue *q = data;
|
|
struct vb2_threadio_data *threadio = q->threadio;
|
|
struct vb2_fileio_data *fileio = q->fileio;
|
|
bool set_timestamp = false;
|
|
int prequeue = 0;
|
|
int index = 0;
|
|
int ret = 0;
|
|
|
|
if (V4L2_TYPE_IS_OUTPUT(q->type)) {
|
|
prequeue = q->num_buffers;
|
|
set_timestamp =
|
|
(q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
|
|
V4L2_BUF_FLAG_TIMESTAMP_COPY;
|
|
}
|
|
|
|
set_freezable();
|
|
|
|
for (;;) {
|
|
struct vb2_buffer *vb;
|
|
|
|
/*
|
|
* Call vb2_dqbuf to get buffer back.
|
|
*/
|
|
memset(&fileio->b, 0, sizeof(fileio->b));
|
|
fileio->b.type = q->type;
|
|
fileio->b.memory = q->memory;
|
|
if (prequeue) {
|
|
fileio->b.index = index++;
|
|
prequeue--;
|
|
} else {
|
|
call_void_qop(q, wait_finish, q);
|
|
if (!threadio->stop)
|
|
ret = vb2_internal_dqbuf(q, &fileio->b, 0);
|
|
call_void_qop(q, wait_prepare, q);
|
|
dprintk(5, "file io: vb2_dqbuf result: %d\n", ret);
|
|
}
|
|
if (ret || threadio->stop)
|
|
break;
|
|
try_to_freeze();
|
|
|
|
vb = q->bufs[fileio->b.index];
|
|
if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR))
|
|
if (threadio->fnc(vb, threadio->priv))
|
|
break;
|
|
call_void_qop(q, wait_finish, q);
|
|
if (set_timestamp)
|
|
v4l2_get_timestamp(&fileio->b.timestamp);
|
|
if (!threadio->stop)
|
|
ret = vb2_internal_qbuf(q, &fileio->b);
|
|
call_void_qop(q, wait_prepare, q);
|
|
if (ret || threadio->stop)
|
|
break;
|
|
}
|
|
|
|
/* Hmm, linux becomes *very* unhappy without this ... */
|
|
while (!kthread_should_stop()) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function should not be used for anything else but the videobuf2-dvb
|
|
* support. If you think you have another good use-case for this, then please
|
|
* contact the linux-media mailinglist first.
|
|
*/
|
|
int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
|
|
const char *thread_name)
|
|
{
|
|
struct vb2_threadio_data *threadio;
|
|
int ret = 0;
|
|
|
|
if (q->threadio)
|
|
return -EBUSY;
|
|
if (vb2_is_busy(q))
|
|
return -EBUSY;
|
|
if (WARN_ON(q->fileio))
|
|
return -EBUSY;
|
|
|
|
threadio = kzalloc(sizeof(*threadio), GFP_KERNEL);
|
|
if (threadio == NULL)
|
|
return -ENOMEM;
|
|
threadio->fnc = fnc;
|
|
threadio->priv = priv;
|
|
|
|
ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type));
|
|
dprintk(3, "file io: vb2_init_fileio result: %d\n", ret);
|
|
if (ret)
|
|
goto nomem;
|
|
q->threadio = threadio;
|
|
threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name);
|
|
if (IS_ERR(threadio->thread)) {
|
|
ret = PTR_ERR(threadio->thread);
|
|
threadio->thread = NULL;
|
|
goto nothread;
|
|
}
|
|
return 0;
|
|
|
|
nothread:
|
|
__vb2_cleanup_fileio(q);
|
|
nomem:
|
|
kfree(threadio);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_thread_start);
|
|
|
|
int vb2_thread_stop(struct vb2_queue *q)
|
|
{
|
|
struct vb2_threadio_data *threadio = q->threadio;
|
|
int err;
|
|
|
|
if (threadio == NULL)
|
|
return 0;
|
|
threadio->stop = true;
|
|
/* Wake up all pending sleeps in the thread */
|
|
vb2_queue_error(q);
|
|
err = kthread_stop(threadio->thread);
|
|
__vb2_cleanup_fileio(q);
|
|
threadio->thread = NULL;
|
|
kfree(threadio);
|
|
q->threadio = NULL;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_thread_stop);
|
|
|
|
/*
|
|
* The following functions are not part of the vb2 core API, but are helper
|
|
* functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
|
|
* and struct vb2_ops.
|
|
* They contain boilerplate code that most if not all drivers have to do
|
|
* and so they simplify the driver code.
|
|
*/
|
|
|
|
/* The queue is busy if there is a owner and you are not that owner. */
|
|
static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
|
|
{
|
|
return vdev->queue->owner && vdev->queue->owner != file->private_data;
|
|
}
|
|
|
|
/* vb2 ioctl helpers */
|
|
|
|
int vb2_ioctl_reqbufs(struct file *file, void *priv,
|
|
struct v4l2_requestbuffers *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
int res = __verify_memory_type(vdev->queue, p->memory, p->type);
|
|
|
|
if (res)
|
|
return res;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
res = __reqbufs(vdev->queue, p);
|
|
/* If count == 0, then the owner has released all buffers and he
|
|
is no longer owner of the queue. Otherwise we have a new owner. */
|
|
if (res == 0)
|
|
vdev->queue->owner = p->count ? file->private_data : NULL;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
|
|
|
|
int vb2_ioctl_create_bufs(struct file *file, void *priv,
|
|
struct v4l2_create_buffers *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
int res = __verify_memory_type(vdev->queue, p->memory, p->format.type);
|
|
|
|
p->index = vdev->queue->num_buffers;
|
|
/* If count == 0, then just check if memory and type are valid.
|
|
Any -EBUSY result from __verify_memory_type can be mapped to 0. */
|
|
if (p->count == 0)
|
|
return res != -EBUSY ? res : 0;
|
|
if (res)
|
|
return res;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
res = __create_bufs(vdev->queue, p);
|
|
if (res == 0)
|
|
vdev->queue->owner = file->private_data;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
|
|
|
|
int vb2_ioctl_prepare_buf(struct file *file, void *priv,
|
|
struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_prepare_buf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
|
|
|
|
int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
/* No need to call vb2_queue_is_busy(), anyone can query buffers. */
|
|
return vb2_querybuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
|
|
|
|
int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_qbuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
|
|
|
|
int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
|
|
|
|
int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_streamon(vdev->queue, i);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
|
|
|
|
int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_streamoff(vdev->queue, i);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
|
|
|
|
int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_expbuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
|
|
|
|
/* v4l2_file_operations helpers */
|
|
|
|
int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
return vb2_mmap(vdev->queue, vma);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_mmap);
|
|
|
|
int _vb2_fop_release(struct file *file, struct mutex *lock)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (lock)
|
|
mutex_lock(lock);
|
|
if (file->private_data == vdev->queue->owner) {
|
|
vb2_queue_release(vdev->queue);
|
|
vdev->queue->owner = NULL;
|
|
}
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return v4l2_fh_release(file);
|
|
}
|
|
EXPORT_SYMBOL_GPL(_vb2_fop_release);
|
|
|
|
int vb2_fop_release(struct file *file)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
|
|
return _vb2_fop_release(file, lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_release);
|
|
|
|
ssize_t vb2_fop_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
int err = -EBUSY;
|
|
|
|
if (!(vdev->queue->io_modes & VB2_WRITE))
|
|
return -EINVAL;
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return -ERESTARTSYS;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
goto exit;
|
|
err = vb2_write(vdev->queue, buf, count, ppos,
|
|
file->f_flags & O_NONBLOCK);
|
|
if (vdev->queue->fileio)
|
|
vdev->queue->owner = file->private_data;
|
|
exit:
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_write);
|
|
|
|
ssize_t vb2_fop_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
int err = -EBUSY;
|
|
|
|
if (!(vdev->queue->io_modes & VB2_READ))
|
|
return -EINVAL;
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return -ERESTARTSYS;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
goto exit;
|
|
err = vb2_read(vdev->queue, buf, count, ppos,
|
|
file->f_flags & O_NONBLOCK);
|
|
if (vdev->queue->fileio)
|
|
vdev->queue->owner = file->private_data;
|
|
exit:
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_read);
|
|
|
|
unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct vb2_queue *q = vdev->queue;
|
|
struct mutex *lock = q->lock ? q->lock : vdev->lock;
|
|
unsigned res;
|
|
void *fileio;
|
|
|
|
/*
|
|
* If this helper doesn't know how to lock, then you shouldn't be using
|
|
* it but you should write your own.
|
|
*/
|
|
WARN_ON(!lock);
|
|
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return POLLERR;
|
|
|
|
fileio = q->fileio;
|
|
|
|
res = vb2_poll(vdev->queue, file, wait);
|
|
|
|
/* If fileio was started, then we have a new queue owner. */
|
|
if (!fileio && q->fileio)
|
|
q->owner = file->private_data;
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_poll);
|
|
|
|
#ifndef CONFIG_MMU
|
|
unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
|
|
#endif
|
|
|
|
/* vb2_ops helpers. Only use if vq->lock is non-NULL. */
|
|
|
|
void vb2_ops_wait_prepare(struct vb2_queue *vq)
|
|
{
|
|
mutex_unlock(vq->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
|
|
|
|
void vb2_ops_wait_finish(struct vb2_queue *vq)
|
|
{
|
|
mutex_lock(vq->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
|
|
|
|
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
|
|
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
|
|
MODULE_LICENSE("GPL");
|