OSCL-LXR linux-6.0.1/​tools/​testing/​selftests/​sync/​sync.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  *  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);
 }

This page was automatically generated by the 2.1.0 LXR engine. The LXR team