include/uapi/linux/dma-buf.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Framework for buffer objects that can be shared across devices/subsystems.
   4  *
   5  * Copyright(C) 2015 Intel Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef _DMA_BUF_UAPI_H_
  21 #define _DMA_BUF_UAPI_H_
  22
  23 #include <linux/types.h>
  24
  25 /* begin/end dma-buf functions used for userspace mmap. */
  26 struct dma_buf_sync {
  27         __u64 flags;
  28 };
  29
  30 #define DMA_BUF_SYNC_READ      (1 << 0)
  31 #define DMA_BUF_SYNC_WRITE     (2 << 0)
  32 #define DMA_BUF_SYNC_RW        (DMA_BUF_SYNC_READ | DMA_BUF_SYNC_WRITE)
  33 #define DMA_BUF_SYNC_START     (0 << 2)
  34 #define DMA_BUF_SYNC_END       (1 << 2)
  35 #define DMA_BUF_SYNC_VALID_FLAGS_MASK \
  36         (DMA_BUF_SYNC_RW | DMA_BUF_SYNC_END)
  37
  38 #define DMA_BUF_BASE            'b'
  39 #define DMA_BUF_IOCTL_SYNC      _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
  40
  41 #endif