/* *  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);}