1 1.12 riastrad /* $NetBSD: dma-buf.h,v 1.12 2021/12/19 12:01:40 riastradh Exp $ */ 2 1.2 riastrad 3 1.2 riastrad /*- 4 1.3 riastrad * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 1.2 riastrad * All rights reserved. 6 1.2 riastrad * 7 1.2 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.2 riastrad * by Taylor R. Campbell. 9 1.2 riastrad * 10 1.2 riastrad * Redistribution and use in source and binary forms, with or without 11 1.2 riastrad * modification, are permitted provided that the following conditions 12 1.2 riastrad * are met: 13 1.2 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.2 riastrad * notice, this list of conditions and the following disclaimer. 15 1.2 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.2 riastrad * documentation and/or other materials provided with the distribution. 18 1.2 riastrad * 19 1.2 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.2 riastrad */ 31 1.2 riastrad 32 1.2 riastrad #ifndef _LINUX_DMA_BUF_H_ 33 1.2 riastrad #define _LINUX_DMA_BUF_H_ 34 1.2 riastrad 35 1.3 riastrad #include <sys/types.h> 36 1.3 riastrad #include <sys/bus.h> 37 1.3 riastrad #include <sys/mutex.h> 38 1.3 riastrad 39 1.7 riastrad #include <linux/err.h> 40 1.11 riastrad #include <linux/dma-mapping.h> 41 1.8 riastrad #include <linux/dma-resv.h> 42 1.11 riastrad #include <linux/scatterlist.h> 43 1.3 riastrad 44 1.3 riastrad struct device; 45 1.3 riastrad struct dma_buf; 46 1.3 riastrad struct dma_buf_attachment; 47 1.3 riastrad struct dma_buf_export_info; 48 1.3 riastrad struct dma_buf_ops; 49 1.3 riastrad struct file; 50 1.3 riastrad struct module; 51 1.8 riastrad struct dma_resv; 52 1.3 riastrad struct sg_table; 53 1.3 riastrad struct uvm_object; 54 1.3 riastrad 55 1.3 riastrad struct dma_buf_ops { 56 1.10 riastrad bool cache_sgt_mapping; 57 1.12 riastrad bool dynamic_mapping; 58 1.5 riastrad int (*attach)(struct dma_buf *, struct dma_buf_attachment *); 59 1.3 riastrad void (*detach)(struct dma_buf *, struct dma_buf_attachment *); 60 1.3 riastrad struct sg_table * 61 1.3 riastrad (*map_dma_buf)(struct dma_buf_attachment *, 62 1.3 riastrad enum dma_data_direction); 63 1.3 riastrad void (*unmap_dma_buf)(struct dma_buf_attachment *, 64 1.3 riastrad struct sg_table *, enum dma_data_direction); 65 1.3 riastrad void (*release)(struct dma_buf *); 66 1.6 riastrad int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction); 67 1.6 riastrad int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction); 68 1.3 riastrad int (*mmap)(struct dma_buf *, off_t *, size_t, int, int *, 69 1.3 riastrad int *, struct uvm_object **, int *); 70 1.3 riastrad void * (*vmap)(struct dma_buf *); 71 1.3 riastrad void (*vunmap)(struct dma_buf *, void *); 72 1.3 riastrad }; 73 1.3 riastrad 74 1.3 riastrad struct dma_buf { 75 1.3 riastrad void *priv; 76 1.3 riastrad const struct dma_buf_ops *ops; 77 1.3 riastrad size_t size; 78 1.8 riastrad struct dma_resv *resv; 79 1.3 riastrad 80 1.3 riastrad kmutex_t db_lock; 81 1.3 riastrad volatile unsigned db_refcnt; 82 1.8 riastrad struct dma_resv_poll db_resv_poll; 83 1.8 riastrad struct dma_resv db_resv_int[]; 84 1.3 riastrad }; 85 1.3 riastrad 86 1.3 riastrad struct dma_buf_attachment { 87 1.3 riastrad void *priv; 88 1.3 riastrad struct dma_buf *dmabuf; 89 1.11 riastrad bus_dma_tag_t dev; /* XXX expedient misnomer */ 90 1.12 riastrad bool dynamic_mapping; 91 1.3 riastrad }; 92 1.3 riastrad 93 1.3 riastrad struct dma_buf_export_info { 94 1.3 riastrad #if 0 95 1.3 riastrad const char *exp_name; 96 1.3 riastrad struct module *owner; 97 1.3 riastrad #endif 98 1.3 riastrad const struct dma_buf_ops *ops; 99 1.3 riastrad size_t size; 100 1.3 riastrad int flags; 101 1.8 riastrad struct dma_resv *resv; 102 1.3 riastrad void *priv; 103 1.3 riastrad }; 104 1.3 riastrad 105 1.3 riastrad #define DEFINE_DMA_BUF_EXPORT_INFO(info) \ 106 1.3 riastrad struct dma_buf_export_info info = { .priv = NULL } 107 1.3 riastrad 108 1.3 riastrad #define dma_buf_attach linux_dma_buf_attach 109 1.3 riastrad #define dma_buf_detach linux_dma_buf_detach 110 1.12 riastrad #define dma_buf_dynamic_attach linux_dma_buf_dynamic_attach 111 1.3 riastrad #define dma_buf_export linux_dma_buf_export 112 1.3 riastrad #define dma_buf_fd linux_dma_buf_fd 113 1.3 riastrad #define dma_buf_get linux_dma_buf_get 114 1.3 riastrad #define dma_buf_map_attachment linux_dma_buf_map_attachment 115 1.3 riastrad #define dma_buf_put linux_dma_buf_put 116 1.3 riastrad #define dma_buf_unmap_attachment linux_dma_buf_unmap_attachment 117 1.3 riastrad #define get_dma_buf linux_get_dma_buf 118 1.3 riastrad 119 1.3 riastrad struct dma_buf * 120 1.3 riastrad dma_buf_export(struct dma_buf_export_info *); 121 1.3 riastrad 122 1.3 riastrad int dma_buf_fd(struct dma_buf *, int); 123 1.3 riastrad struct dma_buf * 124 1.3 riastrad dma_buf_get(int); 125 1.3 riastrad void get_dma_buf(struct dma_buf *); 126 1.3 riastrad void dma_buf_put(struct dma_buf *); 127 1.3 riastrad 128 1.3 riastrad struct dma_buf_attachment * 129 1.11 riastrad dma_buf_attach(struct dma_buf *, bus_dma_tag_t); 130 1.12 riastrad struct dma_buf_attachment * 131 1.12 riastrad dma_buf_dynamic_attach(struct dma_buf *, bus_dma_tag_t, bool); 132 1.3 riastrad void dma_buf_detach(struct dma_buf *, struct dma_buf_attachment *); 133 1.3 riastrad 134 1.3 riastrad struct sg_table * 135 1.3 riastrad dma_buf_map_attachment(struct dma_buf_attachment *, 136 1.3 riastrad enum dma_data_direction); 137 1.3 riastrad void dma_buf_unmap_attachment(struct dma_buf_attachment *, 138 1.3 riastrad struct sg_table *, enum dma_data_direction); 139 1.3 riastrad 140 1.2 riastrad #endif /* _LINUX_DMA_BUF_H_ */ 141
Indexes created Mon Sep 22 21:09:42 GMT 2025