1 /*
2 * Copyright (C) 2018 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 "hwc-resource-manager"
18
19 #include "ResourceManager.h"
20
21 #include <cutils/properties.h>
22 #include <log/log.h>
23 #include <sys/stat.h>
24
25 #include <sstream>
26
27 #include "bufferinfo/BufferInfoGetter.h"
28
29 namespace android {
30
ResourceManager()31 ResourceManager::ResourceManager() : num_displays_(0), gralloc_(NULL) {
32 }
33
Init()34 int ResourceManager::Init() {
35 char path_pattern[PROPERTY_VALUE_MAX];
36 // Could be a valid path or it can have at the end of it the wildcard %
37 // which means that it will try open all devices until an error is met.
38 int path_len = property_get("vendor.hwc.drm.device", path_pattern,
39 "/dev/dri/card%");
40 int ret = 0;
41 if (path_pattern[path_len - 1] != '%') {
42 ret = AddDrmDevice(std::string(path_pattern));
43 } else {
44 path_pattern[path_len - 1] = '\0';
45 for (int idx = 0; !ret; ++idx) {
46 std::ostringstream path;
47 path << path_pattern << idx;
48
49 struct stat buf;
50 if (stat(path.str().c_str(), &buf)) {
51 break;
52 } else if (IsKMSDev(path.str().c_str())) {
53 ret = AddDrmDevice(path.str());
54 }
55 }
56 }
57
58 if (!num_displays_) {
59 ALOGE("Failed to initialize any displays");
60 return ret ? -EINVAL : ret;
61 }
62
63 char scale_with_gpu[PROPERTY_VALUE_MAX];
64 property_get("vendor.hwc.drm.scale_with_gpu", scale_with_gpu, "0");
65 scale_with_gpu_ = bool(strncmp(scale_with_gpu, "0", 1));
66
67 if (!BufferInfoGetter::GetInstance()) {
68 ALOGE("Failed to initialize BufferInfoGetter");
69 return -EINVAL;
70 }
71
72 return hw_get_module(GRALLOC_HARDWARE_MODULE_ID,
73 (const hw_module_t **)&gralloc_);
74 }
75
AddDrmDevice(std::string path)76 int ResourceManager::AddDrmDevice(std::string path) {
77 std::unique_ptr<DrmDevice> drm = std::make_unique<DrmDevice>();
78 int displays_added, ret;
79 std::tie(ret, displays_added) = drm->Init(path.c_str(), num_displays_);
80 if (ret)
81 return ret;
82 std::shared_ptr<Importer> importer;
83 importer.reset(new DrmGenericImporter(drm.get()));
84 if (!importer) {
85 ALOGE("Failed to create importer instance");
86 return -ENODEV;
87 }
88 importers_.push_back(importer);
89 drms_.push_back(std::move(drm));
90 num_displays_ += displays_added;
91 return ret;
92 }
93
AvailableWritebackConnector(int display)94 DrmConnector *ResourceManager::AvailableWritebackConnector(int display) {
95 DrmDevice *drm_device = GetDrmDevice(display);
96 DrmConnector *writeback_conn = NULL;
97 if (drm_device) {
98 writeback_conn = drm_device->AvailableWritebackConnector(display);
99 if (writeback_conn)
100 return writeback_conn;
101 }
102 for (auto &drm : drms_) {
103 if (drm.get() == drm_device)
104 continue;
105 writeback_conn = drm->AvailableWritebackConnector(display);
106 if (writeback_conn)
107 return writeback_conn;
108 }
109 return writeback_conn;
110 }
111
IsKMSDev(const char * path)112 bool ResourceManager::IsKMSDev(const char *path) {
113 int fd = open(path, O_RDWR | O_CLOEXEC);
114 if (fd < 0)
115 return false;
116
117 auto res = drmModeGetResources(fd);
118 if (!res) {
119 close(fd);
120 return false;
121 }
122
123 bool is_kms = res->count_crtcs > 0 && res->count_connectors > 0 &&
124 res->count_encoders > 0;
125
126 drmModeFreeResources(res);
127 close(fd);
128
129 return is_kms;
130 }
131
GetDrmDevice(int display)132 DrmDevice *ResourceManager::GetDrmDevice(int display) {
133 for (auto &drm : drms_) {
134 if (drm->HandlesDisplay(display))
135 return drm.get();
136 }
137 return NULL;
138 }
139
GetImporter(int display)140 std::shared_ptr<Importer> ResourceManager::GetImporter(int display) {
141 for (unsigned int i = 0; i < drms_.size(); i++) {
142 if (drms_[i]->HandlesDisplay(display))
143 return importers_[i];
144 }
145 return NULL;
146 }
147
gralloc()148 const gralloc_module_t *ResourceManager::gralloc() {
149 return gralloc_;
150 }
151 } // namespace android
152