1 /* 2 * Copyright (c) 2019-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <linux/fs.h> 28 #include <linux/slab.h> 29 #include <linux/dma-buf.h> 30 #include <linux/dma-fence.h> 31 #include <linux/export.h> 32 #include <linux/module.h> 33 #include <linux/seq_file.h> 34 #include <linux/poll.h> 35 #include <linux/reservation.h> 36 #include <linux/mm.h> 37 38 struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) 39 { 40 return ERR_PTR(-EINVAL); 41 } 42 43 struct sg_table * 44 dma_buf_map_attachment(struct dma_buf_attachment *attach, 45 enum dma_data_direction direction) 46 { 47 struct sg_table *sg_table; 48 49 if (attach == NULL) 50 return ERR_PTR(-EINVAL); 51 52 if (attach->dmabuf == NULL) 53 return ERR_PTR(-EINVAL); 54 55 sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); 56 if (sg_table == NULL) 57 return ERR_PTR(-ENOMEM); 58 59 return sg_table; 60 } 61 62 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, 63 struct sg_table *sg_table, 64 enum dma_data_direction direction) 65 { 66 } 67 68