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/*
* sync / sw_sync abstraction
* Copyright 2015-2016 Collabora Ltd.
*
* Based on the implementation from the Android Open Source Project,
*
* Copyright 2012 Google, Inc
*
* 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 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.
*/
#include <fcntl.h>
#include <malloc.h>
#include <poll.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "sync.h"
#include "sw_sync.h"
#include <linux/sync_file.h>
/* SW_SYNC ioctls */
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)
int sync_wait(int fd, int timeout)
{
struct pollfd fds;
fds.fd = fd;
fds.events = POLLIN | POLLERR;
return poll(&fds, 1, timeout);
}
int sync_merge(const char *name, int fd1, int fd2)
{
struct sync_merge_data data = {};
int err;
data.fd2 = fd2;
strncpy(data.name, name, sizeof(data.name) - 1);
data.name[sizeof(data.name) - 1] = '\0';
err = ioctl(fd1, SYNC_IOC_MERGE, &data);
if (err < 0)
return err;
return data.fence;
}
static struct sync_file_info *sync_file_info(int fd)
{
struct sync_file_info *info;
struct sync_fence_info *fence_info;
int err, num_fences;
info = calloc(1, sizeof(*info));
if (info == NULL)
return NULL;
err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
if (err < 0) {
free(info);
return NULL;
}
num_fences = info->num_fences;
if (num_fences) {
info->flags = 0;
info->num_fences = num_fences;
fence_info = calloc(num_fences, sizeof(*fence_info));
if (!fence_info) {
free(info);
return NULL;
}
info->sync_fence_info = (uint64_t)(unsigned long)fence_info;
err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
if (err < 0) {
free(fence_info);
free(info);
return NULL;
}
}
return info;
}
static void sync_file_info_free(struct sync_file_info *info)
{
free((void *)(unsigned long)info->sync_fence_info);
free(info);
}
int sync_fence_size(int fd)
{
int count;
struct sync_file_info *info = sync_file_info(fd);
if (!info)
return 0;
count = info->num_fences;
sync_file_info_free(info);
return count;
}
int sync_fence_count_with_status(int fd, int status)
{
unsigned int i, count = 0;
struct sync_fence_info *fence_info = NULL;
struct sync_file_info *info = sync_file_info(fd);
if (!info)
return -1;
fence_info = (struct sync_fence_info *)(unsigned long)info->sync_fence_info;
for (i = 0 ; i < info->num_fences ; i++) {
if (fence_info[i].status == status)
count++;
}
sync_file_info_free(info);
return count;
}
int sw_sync_timeline_create(void)
{
return open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
}
int sw_sync_timeline_inc(int fd, unsigned int count)
{
__u32 arg = count;
return ioctl(fd, SW_SYNC_IOC_INC, &arg);
}
int sw_sync_timeline_is_valid(int fd)
{
int status;
if (fd == -1)
return 0;
status = fcntl(fd, F_GETFD, 0);
return (status >= 0);
}
void sw_sync_timeline_destroy(int fd)
{
if (sw_sync_timeline_is_valid(fd))
close(fd);
}
int sw_sync_fence_create(int fd, const char *name, unsigned int value)
{
struct sw_sync_create_fence_data data = {};
int err;
data.value = value;
strncpy(data.name, name, sizeof(data.name) - 1);
data.name[sizeof(data.name) - 1] = '\0';
err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
if (err < 0)
return err;
return data.fence;
}
int sw_sync_fence_is_valid(int fd)
{
/* Same code! */
return sw_sync_timeline_is_valid(fd);
}
void sw_sync_fence_destroy(int fd)
{
if (sw_sync_fence_is_valid(fd))
close(fd);
}
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