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Jamie Gennisf25e1832012-06-13 16:31:43 -07001/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "Fence"
18#define ATRACE_TAG ATRACE_TAG_GRAPHICS
19//#define LOG_NDEBUG 0
20
Dan Stozad3182402014-11-17 12:03:59 -080021// We would eliminate the non-conforming zero-length array, but we can't since
22// this is effectively included from the Linux kernel
23#pragma clang diagnostic push
24#pragma clang diagnostic ignored "-Wzero-length-array"
Jamie Gennisf25e1832012-06-13 16:31:43 -070025#include <sync/sync.h>
Dan Stozad3182402014-11-17 12:03:59 -080026#pragma clang diagnostic pop
27
Jamie Gennisf25e1832012-06-13 16:31:43 -070028#include <ui/Fence.h>
29#include <unistd.h>
30#include <utils/Log.h>
31#include <utils/Trace.h>
32
33namespace android {
34
Jamie Gennis1df8c342012-12-20 14:05:45 -080035const sp<Fence> Fence::NO_FENCE = sp<Fence>(new Fence);
Jesse Hallef194142012-06-14 14:45:17 -070036
Jamie Gennisf25e1832012-06-13 16:31:43 -070037Fence::Fence() :
38 mFenceFd(-1) {
39}
40
41Fence::Fence(int fenceFd) :
42 mFenceFd(fenceFd) {
43}
44
45Fence::~Fence() {
46 if (mFenceFd != -1) {
47 close(mFenceFd);
48 }
49}
50
Dan Stozad3182402014-11-17 12:03:59 -080051status_t Fence::wait(int timeout) {
Jamie Gennisf25e1832012-06-13 16:31:43 -070052 ATRACE_CALL();
53 if (mFenceFd == -1) {
54 return NO_ERROR;
55 }
Mathias Agopianb5c9dcd2012-10-09 14:38:19 -070056 int err = sync_wait(mFenceFd, timeout);
57 return err < 0 ? -errno : status_t(NO_ERROR);
Jamie Gennisf25e1832012-06-13 16:31:43 -070058}
59
Mathias Agopianea74d3b2013-05-16 18:03:22 -070060status_t Fence::waitForever(const char* logname) {
Jesse Hallba607d52012-10-01 14:05:20 -070061 ATRACE_CALL();
62 if (mFenceFd == -1) {
63 return NO_ERROR;
64 }
Dan Stozad3182402014-11-17 12:03:59 -080065 int warningTimeout = 3000;
Jesse Hallba607d52012-10-01 14:05:20 -070066 int err = sync_wait(mFenceFd, warningTimeout);
Mathias Agopianb5c9dcd2012-10-09 14:38:19 -070067 if (err < 0 && errno == ETIME) {
Jesse Hallba607d52012-10-01 14:05:20 -070068 ALOGE("%s: fence %d didn't signal in %u ms", logname, mFenceFd,
69 warningTimeout);
70 err = sync_wait(mFenceFd, TIMEOUT_NEVER);
71 }
Mathias Agopianb5c9dcd2012-10-09 14:38:19 -070072 return err < 0 ? -errno : status_t(NO_ERROR);
Jesse Hallba607d52012-10-01 14:05:20 -070073}
74
Jamie Gennisf25e1832012-06-13 16:31:43 -070075sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1,
76 const sp<Fence>& f2) {
77 ATRACE_CALL();
Jamie Gennis1df8c342012-12-20 14:05:45 -080078 int result;
79 // Merge the two fences. In the case where one of the fences is not a
80 // valid fence (e.g. NO_FENCE) we merge the one valid fence with itself so
81 // that a new fence with the given name is created.
82 if (f1->isValid() && f2->isValid()) {
83 result = sync_merge(name.string(), f1->mFenceFd, f2->mFenceFd);
84 } else if (f1->isValid()) {
85 result = sync_merge(name.string(), f1->mFenceFd, f1->mFenceFd);
86 } else if (f2->isValid()) {
87 result = sync_merge(name.string(), f2->mFenceFd, f2->mFenceFd);
88 } else {
89 return NO_FENCE;
90 }
Jamie Gennisf25e1832012-06-13 16:31:43 -070091 if (result == -1) {
Mathias Agopiand83d67b2012-07-30 15:10:35 -070092 status_t err = -errno;
93 ALOGE("merge: sync_merge(\"%s\", %d, %d) returned an error: %s (%d)",
94 name.string(), f1->mFenceFd, f2->mFenceFd,
95 strerror(-err), err);
Jesse Hallef194142012-06-14 14:45:17 -070096 return NO_FENCE;
Jamie Gennisf25e1832012-06-13 16:31:43 -070097 }
98 return sp<Fence>(new Fence(result));
99}
100
Jesse Hallf9783af2012-06-25 13:54:23 -0700101int Fence::dup() const {
102 return ::dup(mFenceFd);
103}
104
Jamie Gennis82dbc742012-11-08 19:23:28 -0800105nsecs_t Fence::getSignalTime() const {
106 if (mFenceFd == -1) {
107 return -1;
108 }
109
110 struct sync_fence_info_data* finfo = sync_fence_info(mFenceFd);
111 if (finfo == NULL) {
112 ALOGE("sync_fence_info returned NULL for fd %d", mFenceFd);
113 return -1;
114 }
115 if (finfo->status != 1) {
Jesse Hall7c36cd22013-01-14 15:59:32 -0800116 sync_fence_info_free(finfo);
Jamie Gennis82dbc742012-11-08 19:23:28 -0800117 return INT64_MAX;
118 }
119
120 struct sync_pt_info* pinfo = NULL;
121 uint64_t timestamp = 0;
122 while ((pinfo = sync_pt_info(finfo, pinfo)) != NULL) {
123 if (pinfo->timestamp_ns > timestamp) {
124 timestamp = pinfo->timestamp_ns;
125 }
126 }
127 sync_fence_info_free(finfo);
128
129 return nsecs_t(timestamp);
130}
131
Jamie Gennisf25e1832012-06-13 16:31:43 -0700132size_t Fence::getFlattenedSize() const {
Dan Stoza6fbefbb2015-03-23 13:46:14 -0700133 return 4;
Jamie Gennisf25e1832012-06-13 16:31:43 -0700134}
135
136size_t Fence::getFdCount() const {
Jamie Gennis1df8c342012-12-20 14:05:45 -0800137 return isValid() ? 1 : 0;
Jamie Gennisf25e1832012-06-13 16:31:43 -0700138}
139
Mathias Agopiane1424282013-07-29 21:24:40 -0700140status_t Fence::flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const {
141 if (size < getFlattenedSize() || count < getFdCount()) {
142 return NO_MEMORY;
Jamie Gennisf25e1832012-06-13 16:31:43 -0700143 }
Dan Stoza6fbefbb2015-03-23 13:46:14 -0700144 // Cast to uint32_t since the size of a size_t can vary between 32- and
145 // 64-bit processes
146 FlattenableUtils::write(buffer, size, static_cast<uint32_t>(getFdCount()));
Jamie Gennis1df8c342012-12-20 14:05:45 -0800147 if (isValid()) {
Mathias Agopiane1424282013-07-29 21:24:40 -0700148 *fds++ = mFenceFd;
149 count--;
Jamie Gennis1df8c342012-12-20 14:05:45 -0800150 }
Jamie Gennisf25e1832012-06-13 16:31:43 -0700151 return NO_ERROR;
152}
153
Mathias Agopiane1424282013-07-29 21:24:40 -0700154status_t Fence::unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count) {
Jamie Gennisf25e1832012-06-13 16:31:43 -0700155 if (mFenceFd != -1) {
156 // Don't unflatten if we already have a valid fd.
157 return INVALID_OPERATION;
158 }
159
Mathias Agopiane1424282013-07-29 21:24:40 -0700160 if (size < 1) {
161 return NO_MEMORY;
162 }
163
Colin Cross288f2ef2014-04-14 18:43:12 -0700164 uint32_t numFds;
Mathias Agopiane1424282013-07-29 21:24:40 -0700165 FlattenableUtils::read(buffer, size, numFds);
166
167 if (numFds > 1) {
168 return BAD_VALUE;
169 }
170
171 if (count < numFds) {
172 return NO_MEMORY;
173 }
174
175 if (numFds) {
176 mFenceFd = *fds++;
177 count--;
Jamie Gennis1df8c342012-12-20 14:05:45 -0800178 }
179
Jamie Gennisf25e1832012-06-13 16:31:43 -0700180 return NO_ERROR;
181}
182
183} // namespace android