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/*
* sync.c
*
* Copyright 2012 Google, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fcntl.h>
#include <malloc.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sync/sync.h>
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;
int ret;
if (fd < 0) {
errno = EINVAL;
return -1;
}
fds.fd = fd;
fds.events = POLLIN;
do {
ret = poll(&fds, 1, timeout);
if (ret > 0) {
if (fds.revents & (POLLERR | POLLNVAL)) {
errno = EINVAL;
return -1;
}
return 0;
} else if (ret == 0) {
errno = ETIME;
return -1;
}
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
return ret;
}
int sync_merge(const char *name, int fd1, int fd2)
{
struct sync_legacy_merge_data legacy_data;
struct sync_merge_data data;
int ret;
data.fd2 = fd2;
strlcpy(data.name, name, sizeof(data.name));
data.flags = 0;
data.pad = 0;
ret = ioctl(fd1, SYNC_IOC_MERGE, &data);
if (ret < 0 && errno == ENOTTY) {
legacy_data.fd2 = fd2;
strlcpy(legacy_data.name, name, sizeof(legacy_data.name));
ret = ioctl(fd1, SYNC_IOC_LEGACY_MERGE, &legacy_data);
if (ret < 0)
return ret;
return legacy_data.fence;
} else if (ret < 0) {
return ret;
}
return data.fence;
}
struct sync_fence_info_data *sync_fence_info(int fd)
{
struct sync_fence_info_data *legacy_info;
struct sync_pt_info *legacy_pt_info;
struct sync_file_info *info;
struct sync_fence_info *fence_info;
int err, num_fences, i;
legacy_info = malloc(4096);
if (legacy_info == NULL)
return NULL;
legacy_info->len = 4096;
err = ioctl(fd, SYNC_IOC_LEGACY_FENCE_INFO, legacy_info);
if (err < 0 && errno != ENOTTY) {
free(legacy_info);
return NULL;
} else if (err == 0) {
return legacy_info;
}
info = calloc(1, sizeof(*info));
if (info == NULL)
goto free;
err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
if (err < 0)
goto free;
num_fences = info->num_fences;
if (num_fences) {
info->flags = 0;
info->num_fences = num_fences;
info->sync_fence_info = (uint64_t) calloc(num_fences,
sizeof(struct sync_fence_info));
if ((void *)info->sync_fence_info == NULL)
goto free;
err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
if (err < 0) {
free((void *)info->sync_fence_info);
goto free;
}
}
legacy_info->len = sizeof(*legacy_info) +
num_fences * sizeof(struct sync_pt_info);
strlcpy(legacy_info->name, info->name, sizeof(legacy_info->name));
legacy_info->status = info->status;
legacy_pt_info = (struct sync_pt_info *)legacy_info->pt_info;
fence_info = (struct sync_fence_info *)info->sync_fence_info;
for (i = 0 ; i < num_fences ; i++) {
legacy_pt_info[i].len = sizeof(*legacy_pt_info);
strlcpy(legacy_pt_info[i].obj_name, fence_info[i].obj_name,
sizeof(legacy_pt_info->obj_name));
strlcpy(legacy_pt_info[i].driver_name, fence_info[i].driver_name,
sizeof(legacy_pt_info->driver_name));
legacy_pt_info[i].status = fence_info[i].status;
legacy_pt_info[i].timestamp_ns = fence_info[i].timestamp_ns;
}
free((void *)info->sync_fence_info);
free(info);
return legacy_info;
free:
free(legacy_info);
free(info);
return NULL;
}
struct sync_pt_info *sync_pt_info(struct sync_fence_info_data *info,
struct sync_pt_info *itr)
{
if (itr == NULL)
itr = (struct sync_pt_info *) info->pt_info;
else
itr = (struct sync_pt_info *) ((__u8 *)itr + itr->len);
if ((__u8 *)itr - (__u8 *)info >= (int)info->len)
return NULL;
return itr;
}
void sync_fence_info_free(struct sync_fence_info_data *info)
{
free(info);
}
int sw_sync_timeline_create(void)
{
int ret;
ret = open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
if (ret < 0)
ret = open("/dev/sw_sync", O_RDWR);
return ret;
}
int sw_sync_timeline_inc(int fd, unsigned count)
{
__u32 arg = count;
return ioctl(fd, SW_SYNC_IOC_INC, &arg);
}
int sw_sync_fence_create(int fd, const char *name, unsigned value)
{
struct sw_sync_create_fence_data data;
int err;
data.value = value;
strlcpy(data.name, name, sizeof(data.name));
err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
if (err < 0)
return err;
return data.fence;
}
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