1 /* $OpenBSD: dma-buf.h,v 1.3 2021/07/07 02:38:36 jsg Exp $ */ 2 /* 3 * Copyright (c) 2018 Mark Kettenis 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef _LINUX_DMA_BUF_H 19 #define _LINUX_DMA_BUF_H 20 21 #include <sys/types.h> 22 #include <sys/systm.h> 23 #include <linux/dma-resv.h> 24 #include <linux/list.h> 25 26 struct dma_buf_ops; 27 28 struct dma_buf { 29 const struct dma_buf_ops *ops; 30 void *priv; 31 size_t size; 32 struct file *file; 33 struct list_head attachments; 34 struct dma_resv *resv; 35 }; 36 37 struct dma_buf_attachment { 38 void *importer_priv; 39 }; 40 41 struct dma_buf_attach_ops { 42 void (*move_notify)(struct dma_buf_attachment *); 43 bool allow_peer2peer; 44 }; 45 46 void get_dma_buf(struct dma_buf *); 47 struct dma_buf *dma_buf_get(int); 48 void dma_buf_put(struct dma_buf *); 49 int dma_buf_fd(struct dma_buf *, int); 50 51 struct dma_buf_ops { 52 void (*release)(struct dma_buf *); 53 }; 54 55 struct dma_buf_export_info { 56 const struct dma_buf_ops *ops; 57 size_t size; 58 int flags; 59 void *priv; 60 struct dma_resv *resv; 61 }; 62 63 #define DEFINE_DMA_BUF_EXPORT_INFO(x) struct dma_buf_export_info x 64 65 struct dma_buf *dma_buf_export(const struct dma_buf_export_info *); 66 67 #define dma_buf_attach(x, y) NULL 68 #define dma_buf_detach(x, y) panic("dma_buf_detach") 69 70 #endif 71