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/*
* Copyright 2012 Google, Inc
* Copyright © 2016 Collabora, Ltd.
*
* Based on the implementation from the Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Robert Foss <robert.foss@collabora.com>
*/
#include <fcntl.h>
#include <poll.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/sync_file.h>
#include <sys/ioctl.h>
#include "sw_sync.h"
#ifndef SW_SYNC_IOC_INC
struct sw_sync_create_fence_data {
__u32 value;
char name[32];
__s32 fence;
};
#define SW_SYNC_IOC_MAGIC 'W'
#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
struct sw_sync_create_fence_data)
#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
#endif
#define DEVFS_SW_SYNC "/dev/sw_sync"
#define DEBUGFS_SW_SYNC "/sys/kernel/debug/sync/sw_sync"
bool sw_sync_is_supported(void)
{
if (access(DEVFS_SW_SYNC, R_OK | W_OK) != -1) {
return true;
} else if (access(DEBUGFS_SW_SYNC, R_OK | W_OK) != -1 ) {
return true;
}
return false;
}
int sw_sync_timeline_create(void)
{
int fd = open(DEVFS_SW_SYNC, O_RDWR);
if (fd < 0)
fd = open(DEBUGFS_SW_SYNC, O_RDWR);
return fd;
}
void sw_sync_timeline_destroy(int fd)
{
close(fd);
}
void sw_sync_fence_destroy(int fd)
{
close(fd);
}
int sw_sync_fence_create(int fd, int32_t seqno)
{
struct sw_sync_create_fence_data data = {};
data.value = seqno;
if (fd < 0)
return -1;
ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
return data.fence;
}
void sw_sync_timeline_inc(int fd, uint32_t count)
{
uint32_t arg = count;
if (fd == 0 || fd == -1)
return;
ioctl(fd, SW_SYNC_IOC_INC, &arg);
}
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