520 lines
20 KiB
C
520 lines
20 KiB
C
/*
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* videobuf2-core.h - 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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*
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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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#ifndef _MEDIA_VIDEOBUF2_CORE_H
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#define _MEDIA_VIDEOBUF2_CORE_H
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#include <linux/mm_types.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/videodev2.h>
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#include <linux/dma-buf.h>
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struct vb2_alloc_ctx;
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struct vb2_fileio_data;
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/**
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* struct vb2_mem_ops - memory handling/memory allocator operations
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* @alloc: allocate video memory and, optionally, allocator private data,
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* return NULL on failure or a pointer to allocator private,
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* per-buffer data on success; the returned private structure
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* will then be passed as buf_priv argument to other ops in this
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* structure. Additional gfp_flags to use when allocating the
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* are also passed to this operation. These flags are from the
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* gfp_flags field of vb2_queue.
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* @put: inform the allocator that the buffer will no longer be used;
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* usually will result in the allocator freeing the buffer (if
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* no other users of this buffer are present); the buf_priv
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* argument is the allocator private per-buffer structure
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* previously returned from the alloc callback
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* @get_userptr: acquire userspace memory for a hardware operation; used for
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* USERPTR memory types; vaddr is the address passed to the
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* videobuf layer when queuing a video buffer of USERPTR type;
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* should return an allocator private per-buffer structure
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* associated with the buffer on success, NULL on failure;
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* the returned private structure will then be passed as buf_priv
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* argument to other ops in this structure
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* @put_userptr: inform the allocator that a USERPTR buffer will no longer
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* be used
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* @attach_dmabuf: attach a shared struct dma_buf for a hardware operation;
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* used for DMABUF memory types; alloc_ctx is the alloc context
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* dbuf is the shared dma_buf; returns NULL on failure;
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* allocator private per-buffer structure on success;
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* this needs to be used for further accesses to the buffer
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* @detach_dmabuf: inform the exporter of the buffer that the current DMABUF
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* buffer is no longer used; the buf_priv argument is the
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* allocator private per-buffer structure previously returned
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* from the attach_dmabuf callback
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* @map_dmabuf: request for access to the dmabuf from allocator; the allocator
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* of dmabuf is informed that this driver is going to use the
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* dmabuf
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* @unmap_dmabuf: releases access control to the dmabuf - allocator is notified
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* that this driver is done using the dmabuf for now
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* @prepare: called every time the buffer is passed from userspace to the
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* driver, useful for cache synchronisation, optional
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* @finish: called every time the buffer is passed back from the driver
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* to the userspace, also optional
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* @vaddr: return a kernel virtual address to a given memory buffer
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* associated with the passed private structure or NULL if no
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* such mapping exists
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* @cookie: return allocator specific cookie for a given memory buffer
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* associated with the passed private structure or NULL if not
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* available
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* @num_users: return the current number of users of a memory buffer;
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* return 1 if the videobuf layer (or actually the driver using
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* it) is the only user
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* @mmap: setup a userspace mapping for a given memory buffer under
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* the provided virtual memory region
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*
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* Required ops for USERPTR types: get_userptr, put_userptr.
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* Required ops for MMAP types: alloc, put, num_users, mmap.
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* Required ops for read/write access types: alloc, put, num_users, vaddr
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* Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf,
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* unmap_dmabuf.
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*/
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struct vb2_mem_ops {
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void *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t gfp_flags);
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void (*put)(void *buf_priv);
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struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags);
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void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr,
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unsigned long size, int write);
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void (*put_userptr)(void *buf_priv);
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void (*prepare)(void *buf_priv);
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void (*finish)(void *buf_priv);
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void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf,
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unsigned long size, int write);
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void (*detach_dmabuf)(void *buf_priv);
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int (*map_dmabuf)(void *buf_priv);
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void (*unmap_dmabuf)(void *buf_priv);
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void *(*vaddr)(void *buf_priv);
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void *(*cookie)(void *buf_priv);
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unsigned int (*num_users)(void *buf_priv);
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int (*mmap)(void *buf_priv, struct vm_area_struct *vma);
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};
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struct vb2_plane {
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void *mem_priv;
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struct dma_buf *dbuf;
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unsigned int dbuf_mapped;
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};
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/**
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* enum vb2_io_modes - queue access methods
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* @VB2_MMAP: driver supports MMAP with streaming API
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* @VB2_USERPTR: driver supports USERPTR with streaming API
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* @VB2_READ: driver supports read() style access
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* @VB2_WRITE: driver supports write() style access
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* @VB2_DMABUF: driver supports DMABUF with streaming API
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*/
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enum vb2_io_modes {
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VB2_MMAP = (1 << 0),
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VB2_USERPTR = (1 << 1),
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VB2_READ = (1 << 2),
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VB2_WRITE = (1 << 3),
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VB2_DMABUF = (1 << 4),
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};
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/**
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* enum vb2_fileio_flags - flags for selecting a mode of the file io emulator,
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* by default the 'streaming' style is used by the file io emulator
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* @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer
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* @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call
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*/
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enum vb2_fileio_flags {
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VB2_FILEIO_READ_ONCE = (1 << 0),
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VB2_FILEIO_WRITE_IMMEDIATELY = (1 << 1),
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};
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/**
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* enum vb2_buffer_state - current video buffer state
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* @VB2_BUF_STATE_DEQUEUED: buffer under userspace control
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* @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf
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* @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver
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* @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver
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* @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used
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* in a hardware operation
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* @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but
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* not yet dequeued to userspace
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* @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer
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* has ended with an error, which will be reported
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* to the userspace when it is dequeued
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*/
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enum vb2_buffer_state {
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VB2_BUF_STATE_DEQUEUED,
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VB2_BUF_STATE_PREPARING,
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VB2_BUF_STATE_PREPARED,
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VB2_BUF_STATE_QUEUED,
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VB2_BUF_STATE_ACTIVE,
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VB2_BUF_STATE_DONE,
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VB2_BUF_STATE_ERROR,
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};
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struct vb2_queue;
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/**
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* struct vb2_buffer - represents a video buffer
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* @v4l2_buf: struct v4l2_buffer associated with this buffer; can
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* be read by the driver and relevant entries can be
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* changed by the driver in case of CAPTURE types
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* (such as timestamp)
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* @v4l2_planes: struct v4l2_planes associated with this buffer; can
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* be read by the driver and relevant entries can be
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* changed by the driver in case of CAPTURE types
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* (such as bytesused); NOTE that even for single-planar
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* types, the v4l2_planes[0] struct should be used
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* instead of v4l2_buf for filling bytesused - drivers
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* should use the vb2_set_plane_payload() function for that
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* @vb2_queue: the queue to which this driver belongs
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* @num_planes: number of planes in the buffer
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* on an internal driver queue
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* @state: current buffer state; do not change
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* @queued_entry: entry on the queued buffers list, which holds all
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* buffers queued from userspace
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* @done_entry: entry on the list that stores all buffers ready to
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* be dequeued to userspace
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* @planes: private per-plane information; do not change
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*/
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struct vb2_buffer {
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struct v4l2_buffer v4l2_buf;
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struct v4l2_plane v4l2_planes[VIDEO_MAX_PLANES];
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struct vb2_queue *vb2_queue;
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unsigned int num_planes;
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/* Private: internal use only */
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enum vb2_buffer_state state;
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struct list_head queued_entry;
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struct list_head done_entry;
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struct vb2_plane planes[VIDEO_MAX_PLANES];
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};
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/**
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* struct vb2_ops - driver-specific callbacks
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*
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* @queue_setup: called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS
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* handlers before memory allocation, or, if
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* *num_planes != 0, after the allocation to verify a
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* smaller number of buffers. Driver should return
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* the required number of buffers in *num_buffers, the
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* required number of planes per buffer in *num_planes; the
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* size of each plane should be set in the sizes[] array
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* and optional per-plane allocator specific context in the
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* alloc_ctxs[] array. When called from VIDIOC_REQBUFS,
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* fmt == NULL, the driver has to use the currently
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* configured format and *num_buffers is the total number
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* of buffers, that are being allocated. When called from
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* VIDIOC_CREATE_BUFS, fmt != NULL and it describes the
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* target frame format (if the format isn't valid the
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* callback must return -EINVAL). In this case *num_buffers
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* are being allocated additionally to q->num_buffers.
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* @wait_prepare: release any locks taken while calling vb2 functions;
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* it is called before an ioctl needs to wait for a new
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* buffer to arrive; required to avoid a deadlock in
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* blocking access type
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* @wait_finish: reacquire all locks released in the previous callback;
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* required to continue operation after sleeping while
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* waiting for a new buffer to arrive
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* @buf_init: called once after allocating a buffer (in MMAP case)
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* or after acquiring a new USERPTR buffer; drivers may
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* perform additional buffer-related initialization;
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* initialization failure (return != 0) will prevent
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* queue setup from completing successfully; optional
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* @buf_prepare: called every time the buffer is queued from userspace
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* and from the VIDIOC_PREPARE_BUF ioctl; drivers may
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* perform any initialization required before each hardware
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* operation in this callback; drivers that support
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* VIDIOC_CREATE_BUFS must also validate the buffer size;
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* if an error is returned, the buffer will not be queued
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* in driver; optional
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* @buf_finish: called before every dequeue of the buffer back to
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* userspace; drivers may perform any operations required
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* before userspace accesses the buffer; optional
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* @buf_cleanup: called once before the buffer is freed; drivers may
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* perform any additional cleanup; optional
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* @start_streaming: called once to enter 'streaming' state; the driver may
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* receive buffers with @buf_queue callback before
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* @start_streaming is called; the driver gets the number
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* of already queued buffers in count parameter; driver
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* can return an error if hardware fails, in that case all
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* buffers that have been already given by the @buf_queue
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* callback are invalidated.
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* If there were not enough queued buffers to start
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* streaming, then this callback returns -ENOBUFS, and the
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* vb2 core will retry calling @start_streaming when a new
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* buffer is queued.
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* @stop_streaming: called when 'streaming' state must be disabled; driver
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* should stop any DMA transactions or wait until they
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* finish and give back all buffers it got from buf_queue()
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* callback; may use vb2_wait_for_all_buffers() function
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* @buf_queue: passes buffer vb to the driver; driver may start
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* hardware operation on this buffer; driver should give
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* the buffer back by calling vb2_buffer_done() function;
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* it is allways called after calling STREAMON ioctl;
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* might be called before start_streaming callback if user
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* pre-queued buffers before calling STREAMON
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*/
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struct vb2_ops {
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int (*queue_setup)(struct vb2_queue *q, const struct v4l2_format *fmt,
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unsigned int *num_buffers, unsigned int *num_planes,
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unsigned int sizes[], void *alloc_ctxs[]);
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void (*wait_prepare)(struct vb2_queue *q);
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void (*wait_finish)(struct vb2_queue *q);
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int (*buf_init)(struct vb2_buffer *vb);
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int (*buf_prepare)(struct vb2_buffer *vb);
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int (*buf_finish)(struct vb2_buffer *vb);
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void (*buf_cleanup)(struct vb2_buffer *vb);
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int (*start_streaming)(struct vb2_queue *q, unsigned int count);
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int (*stop_streaming)(struct vb2_queue *q);
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void (*buf_queue)(struct vb2_buffer *vb);
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};
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struct v4l2_fh;
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/**
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* struct vb2_queue - a videobuf queue
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*
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* @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h
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* @io_modes: supported io methods (see vb2_io_modes enum)
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* @io_flags: additional io flags (see vb2_fileio_flags enum)
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* @lock: pointer to a mutex that protects the vb2_queue struct. The
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* driver can set this to a mutex to let the v4l2 core serialize
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* the queuing ioctls. If the driver wants to handle locking
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* itself, then this should be set to NULL. This lock is not used
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* by the videobuf2 core API.
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* @owner: The filehandle that 'owns' the buffers, i.e. the filehandle
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* that called reqbufs, create_buffers or started fileio.
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* This field is not used by the videobuf2 core API, but it allows
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* drivers to easily associate an owner filehandle with the queue.
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* @ops: driver-specific callbacks
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* @mem_ops: memory allocator specific callbacks
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* @drv_priv: driver private data
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* @buf_struct_size: size of the driver-specific buffer structure;
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* "0" indicates the driver doesn't want to use a custom buffer
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* structure type, so sizeof(struct vb2_buffer) will is used
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* @gfp_flags: additional gfp flags used when allocating the buffers.
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* Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32
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* to force the buffer allocation to a specific memory zone.
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*
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* @memory: current memory type used
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* @bufs: videobuf buffer structures
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* @num_buffers: number of allocated/used buffers
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* @queued_list: list of buffers currently queued from userspace
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* @queued_count: number of buffers owned by the driver
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* @done_list: list of buffers ready to be dequeued to userspace
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* @done_lock: lock to protect done_list list
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* @done_wq: waitqueue for processes waiting for buffers ready to be dequeued
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* @alloc_ctx: memory type/allocator-specific contexts for each plane
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* @streaming: current streaming state
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* @retry_start_streaming: start_streaming() was called, but there were not enough
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* buffers queued. If set, then retry calling start_streaming when
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* queuing a new buffer.
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* @fileio: file io emulator internal data, used only if emulator is active
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*/
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struct vb2_queue {
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enum v4l2_buf_type type;
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unsigned int io_modes;
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unsigned int io_flags;
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struct mutex *lock;
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struct v4l2_fh *owner;
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const struct vb2_ops *ops;
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const struct vb2_mem_ops *mem_ops;
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void *drv_priv;
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unsigned int buf_struct_size;
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u32 timestamp_type;
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gfp_t gfp_flags;
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/* private: internal use only */
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enum v4l2_memory memory;
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struct vb2_buffer *bufs[VIDEO_MAX_FRAME];
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unsigned int num_buffers;
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struct list_head queued_list;
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atomic_t queued_count;
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struct list_head done_list;
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spinlock_t done_lock;
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wait_queue_head_t done_wq;
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void *alloc_ctx[VIDEO_MAX_PLANES];
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unsigned int plane_sizes[VIDEO_MAX_PLANES];
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unsigned int streaming:1;
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unsigned int retry_start_streaming:1;
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struct vb2_fileio_data *fileio;
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};
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void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no);
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void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
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void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
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int vb2_wait_for_all_buffers(struct vb2_queue *q);
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int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
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int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
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int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
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int __must_check vb2_queue_init(struct vb2_queue *q);
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void vb2_queue_release(struct vb2_queue *q);
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int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
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int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
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int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
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int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
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int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
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#ifndef CONFIG_MMU
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unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags);
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#endif
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unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
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size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
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loff_t *ppos, int nonblock);
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size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
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loff_t *ppos, int nonblock);
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/**
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* vb2_is_streaming() - return streaming status of the queue
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* @q: videobuf queue
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*/
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static inline bool vb2_is_streaming(struct vb2_queue *q)
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{
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return q->streaming;
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}
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/**
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* vb2_is_busy() - return busy status of the queue
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* @q: videobuf queue
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*
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* This function checks if queue has any buffers allocated.
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*/
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static inline bool vb2_is_busy(struct vb2_queue *q)
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{
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return (q->num_buffers > 0);
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}
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/**
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* vb2_get_drv_priv() - return driver private data associated with the queue
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* @q: videobuf queue
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*/
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static inline void *vb2_get_drv_priv(struct vb2_queue *q)
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{
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return q->drv_priv;
|
|
}
|
|
|
|
/**
|
|
* vb2_set_plane_payload() - set bytesused for the plane plane_no
|
|
* @vb: buffer for which plane payload should be set
|
|
* @plane_no: plane number for which payload should be set
|
|
* @size: payload in bytes
|
|
*/
|
|
static inline void vb2_set_plane_payload(struct vb2_buffer *vb,
|
|
unsigned int plane_no, unsigned long size)
|
|
{
|
|
if (plane_no < vb->num_planes)
|
|
vb->v4l2_planes[plane_no].bytesused = size;
|
|
}
|
|
|
|
/**
|
|
* vb2_get_plane_payload() - get bytesused for the plane plane_no
|
|
* @vb: buffer for which plane payload should be set
|
|
* @plane_no: plane number for which payload should be set
|
|
* @size: payload in bytes
|
|
*/
|
|
static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb,
|
|
unsigned int plane_no)
|
|
{
|
|
if (plane_no < vb->num_planes)
|
|
return vb->v4l2_planes[plane_no].bytesused;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vb2_plane_size() - return plane size in bytes
|
|
* @vb: buffer for which plane size should be returned
|
|
* @plane_no: plane number for which size should be returned
|
|
*/
|
|
static inline unsigned long
|
|
vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
|
|
{
|
|
if (plane_no < vb->num_planes)
|
|
return vb->v4l2_planes[plane_no].length;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The following functions are not part of the vb2 core API, but are simple
|
|
* helper functions that you can use in your struct v4l2_file_operations,
|
|
* struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
|
|
* or video_device->lock is set, and they will set and test vb2_queue->owner
|
|
* to check if the calling filehandle is permitted to do the queuing operation.
|
|
*/
|
|
|
|
/* struct v4l2_ioctl_ops helpers */
|
|
|
|
int vb2_ioctl_reqbufs(struct file *file, void *priv,
|
|
struct v4l2_requestbuffers *p);
|
|
int vb2_ioctl_create_bufs(struct file *file, void *priv,
|
|
struct v4l2_create_buffers *p);
|
|
int vb2_ioctl_prepare_buf(struct file *file, void *priv,
|
|
struct v4l2_buffer *p);
|
|
int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
|
|
int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
|
|
int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
|
|
int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
|
|
int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
|
|
int vb2_ioctl_expbuf(struct file *file, void *priv,
|
|
struct v4l2_exportbuffer *p);
|
|
|
|
/* struct v4l2_file_operations helpers */
|
|
|
|
int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
|
|
int vb2_fop_release(struct file *file);
|
|
int _vb2_fop_release(struct file *file, struct mutex *lock);
|
|
ssize_t vb2_fop_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos);
|
|
ssize_t vb2_fop_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos);
|
|
unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
|
|
#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);
|
|
#endif
|
|
|
|
/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
|
|
|
|
void vb2_ops_wait_prepare(struct vb2_queue *vq);
|
|
void vb2_ops_wait_finish(struct vb2_queue *vq);
|
|
|
|
#endif /* _MEDIA_VIDEOBUF2_CORE_H */
|