2016-10-19 06:49:48 -06:00
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/*
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* sync / sw_sync abstraction
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* Copyright 2015-2016 Collabora Ltd.
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*
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* Based on the implementation from the Android Open Source Project,
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*
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* Copyright 2012 Google, Inc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <fcntl.h>
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#include <malloc.h>
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#include <poll.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "sync.h"
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#include "sw_sync.h"
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#include <linux/sync_file.h>
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/* SW_SYNC ioctls */
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struct sw_sync_create_fence_data {
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__u32 value;
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char name[32];
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__s32 fence;
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};
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#define SW_SYNC_IOC_MAGIC 'W'
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#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
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struct sw_sync_create_fence_data)
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#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
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int sync_wait(int fd, int timeout)
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{
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struct pollfd fds;
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fds.fd = fd;
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fds.events = POLLIN | POLLERR;
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return poll(&fds, 1, timeout);
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}
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int sync_merge(const char *name, int fd1, int fd2)
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{
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struct sync_merge_data data = {};
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int err;
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data.fd2 = fd2;
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strncpy(data.name, name, sizeof(data.name) - 1);
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data.name[sizeof(data.name) - 1] = '\0';
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err = ioctl(fd1, SYNC_IOC_MERGE, &data);
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if (err < 0)
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return err;
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return data.fence;
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}
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static struct sync_file_info *sync_file_info(int fd)
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{
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struct sync_file_info *info;
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struct sync_fence_info *fence_info;
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int err, num_fences;
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info = calloc(1, sizeof(*info));
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if (info == NULL)
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return NULL;
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err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
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if (err < 0) {
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free(info);
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return NULL;
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}
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num_fences = info->num_fences;
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if (num_fences) {
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info->flags = 0;
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info->num_fences = num_fences;
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fence_info = calloc(num_fences, sizeof(*fence_info));
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if (!fence_info) {
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free(info);
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return NULL;
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}
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2019-10-22 22:58:16 -06:00
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info->sync_fence_info = (uint64_t)(unsigned long)fence_info;
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2016-10-19 06:49:48 -06:00
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err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
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if (err < 0) {
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free(fence_info);
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free(info);
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return NULL;
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}
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}
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return info;
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}
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static void sync_file_info_free(struct sync_file_info *info)
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{
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2019-10-22 22:58:16 -06:00
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free((void *)(unsigned long)info->sync_fence_info);
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2016-10-19 06:49:48 -06:00
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free(info);
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}
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int sync_fence_size(int fd)
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{
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int count;
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struct sync_file_info *info = sync_file_info(fd);
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if (!info)
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return 0;
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count = info->num_fences;
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sync_file_info_free(info);
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return count;
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}
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int sync_fence_count_with_status(int fd, int status)
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{
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unsigned int i, count = 0;
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struct sync_fence_info *fence_info = NULL;
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struct sync_file_info *info = sync_file_info(fd);
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if (!info)
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return -1;
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2019-10-22 22:58:16 -06:00
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fence_info = (struct sync_fence_info *)(unsigned long)info->sync_fence_info;
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2016-10-19 06:49:48 -06:00
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for (i = 0 ; i < info->num_fences ; i++) {
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if (fence_info[i].status == status)
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count++;
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}
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sync_file_info_free(info);
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return count;
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}
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int sw_sync_timeline_create(void)
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{
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return open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
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}
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int sw_sync_timeline_inc(int fd, unsigned int count)
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{
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__u32 arg = count;
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return ioctl(fd, SW_SYNC_IOC_INC, &arg);
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}
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int sw_sync_timeline_is_valid(int fd)
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{
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int status;
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if (fd == -1)
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return 0;
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status = fcntl(fd, F_GETFD, 0);
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return (status >= 0);
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}
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void sw_sync_timeline_destroy(int fd)
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{
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if (sw_sync_timeline_is_valid(fd))
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close(fd);
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}
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int sw_sync_fence_create(int fd, const char *name, unsigned int value)
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{
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struct sw_sync_create_fence_data data = {};
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int err;
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data.value = value;
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strncpy(data.name, name, sizeof(data.name) - 1);
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data.name[sizeof(data.name) - 1] = '\0';
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err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
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if (err < 0)
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return err;
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return data.fence;
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}
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int sw_sync_fence_is_valid(int fd)
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{
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/* Same code! */
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return sw_sync_timeline_is_valid(fd);
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}
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void sw_sync_fence_destroy(int fd)
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{
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if (sw_sync_fence_is_valid(fd))
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close(fd);
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}
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