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/* $NetBSD: dma-buf.h,v 1.12 2021/12/19 12:01:40 riastradh Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_DMA_BUF_H_
#define _LINUX_DMA_BUF_H_
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/mutex.h>
#include <linux/err.h>
#include <linux/dma-mapping.h>
#include <linux/dma-resv.h>
#include <linux/scatterlist.h>
struct device;
struct dma_buf;
struct dma_buf_attachment;
struct dma_buf_export_info;
struct dma_buf_ops;
struct file;
struct module;
struct dma_resv;
struct sg_table;
struct uvm_object;
struct dma_buf_ops {
bool cache_sgt_mapping;
bool dynamic_mapping;
int (*attach)(struct dma_buf *, struct dma_buf_attachment *);
void (*detach)(struct dma_buf *, struct dma_buf_attachment *);
struct sg_table *
(*map_dma_buf)(struct dma_buf_attachment *,
enum dma_data_direction);
void (*unmap_dma_buf)(struct dma_buf_attachment *,
struct sg_table *, enum dma_data_direction);
void (*release)(struct dma_buf *);
int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
int (*mmap)(struct dma_buf *, off_t *, size_t, int, int *,
int *, struct uvm_object **, int *);
void * (*vmap)(struct dma_buf *);
void (*vunmap)(struct dma_buf *, void *);
};
struct dma_buf {
void *priv;
const struct dma_buf_ops *ops;
size_t size;
struct dma_resv *resv;
kmutex_t db_lock;
volatile unsigned db_refcnt;
struct dma_resv_poll db_resv_poll;
struct dma_resv db_resv_int[];
};
struct dma_buf_attachment {
void *priv;
struct dma_buf *dmabuf;
bus_dma_tag_t dev; /* XXX expedient misnomer */
bool dynamic_mapping;
};
struct dma_buf_export_info {
#if 0
const char *exp_name;
struct module *owner;
#endif
const struct dma_buf_ops *ops;
size_t size;
int flags;
struct dma_resv *resv;
void *priv;
};
#define DEFINE_DMA_BUF_EXPORT_INFO(info) \
struct dma_buf_export_info info = { .priv = NULL }
#define dma_buf_attach linux_dma_buf_attach
#define dma_buf_detach linux_dma_buf_detach
#define dma_buf_dynamic_attach linux_dma_buf_dynamic_attach
#define dma_buf_export linux_dma_buf_export
#define dma_buf_fd linux_dma_buf_fd
#define dma_buf_get linux_dma_buf_get
#define dma_buf_map_attachment linux_dma_buf_map_attachment
#define dma_buf_put linux_dma_buf_put
#define dma_buf_unmap_attachment linux_dma_buf_unmap_attachment
#define get_dma_buf linux_get_dma_buf
struct dma_buf *
dma_buf_export(struct dma_buf_export_info *);
int dma_buf_fd(struct dma_buf *, int);
struct dma_buf *
dma_buf_get(int);
void get_dma_buf(struct dma_buf *);
void dma_buf_put(struct dma_buf *);
struct dma_buf_attachment *
dma_buf_attach(struct dma_buf *, bus_dma_tag_t);
struct dma_buf_attachment *
dma_buf_dynamic_attach(struct dma_buf *, bus_dma_tag_t, bool);
void dma_buf_detach(struct dma_buf *, struct dma_buf_attachment *);
struct sg_table *
dma_buf_map_attachment(struct dma_buf_attachment *,
enum dma_data_direction);
void dma_buf_unmap_attachment(struct dma_buf_attachment *,
struct sg_table *, enum dma_data_direction);
#endif /* _LINUX_DMA_BUF_H_ */
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