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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "hwc-resource-manager"
#include "ResourceManager.h"
#include <cutils/properties.h>
#include <log/log.h>
#include <sys/stat.h>
#include <sstream>
#include "bufferinfo/BufferInfoGetter.h"
namespace android {
ResourceManager::ResourceManager() : num_displays_(0), gralloc_(NULL) {
}
int ResourceManager::Init() {
char path_pattern[PROPERTY_VALUE_MAX];
// Could be a valid path or it can have at the end of it the wildcard %
// which means that it will try open all devices until an error is met.
int path_len = property_get("vendor.hwc.drm.device", path_pattern,
"/dev/dri/card%");
int ret = 0;
if (path_pattern[path_len - 1] != '%') {
ret = AddDrmDevice(std::string(path_pattern));
} else {
path_pattern[path_len - 1] = '\0';
for (int idx = 0; !ret; ++idx) {
std::ostringstream path;
path << path_pattern << idx;
struct stat buf;
if (stat(path.str().c_str(), &buf)) {
break;
} else if (IsKMSDev(path.str().c_str())) {
ret = AddDrmDevice(path.str());
}
}
}
if (!num_displays_) {
ALOGE("Failed to initialize any displays");
return ret ? -EINVAL : ret;
}
char scale_with_gpu[PROPERTY_VALUE_MAX];
property_get("vendor.hwc.drm.scale_with_gpu", scale_with_gpu, "0");
scale_with_gpu_ = bool(strncmp(scale_with_gpu, "0", 1));
if (!BufferInfoGetter::GetInstance()) {
ALOGE("Failed to initialize BufferInfoGetter");
return -EINVAL;
}
return hw_get_module(GRALLOC_HARDWARE_MODULE_ID,
(const hw_module_t **)&gralloc_);
}
int ResourceManager::AddDrmDevice(std::string path) {
std::unique_ptr<DrmDevice> drm = std::make_unique<DrmDevice>();
int displays_added, ret;
std::tie(ret, displays_added) = drm->Init(path.c_str(), num_displays_);
if (ret)
return ret;
std::shared_ptr<Importer> importer;
importer.reset(new DrmGenericImporter(drm.get()));
if (!importer) {
ALOGE("Failed to create importer instance");
return -ENODEV;
}
importers_.push_back(importer);
drms_.push_back(std::move(drm));
num_displays_ += displays_added;
return ret;
}
DrmConnector *ResourceManager::AvailableWritebackConnector(int display) {
DrmDevice *drm_device = GetDrmDevice(display);
DrmConnector *writeback_conn = NULL;
if (drm_device) {
writeback_conn = drm_device->AvailableWritebackConnector(display);
if (writeback_conn)
return writeback_conn;
}
for (auto &drm : drms_) {
if (drm.get() == drm_device)
continue;
writeback_conn = drm->AvailableWritebackConnector(display);
if (writeback_conn)
return writeback_conn;
}
return writeback_conn;
}
bool ResourceManager::IsKMSDev(const char *path) {
int fd = open(path, O_RDWR | O_CLOEXEC);
if (fd < 0)
return false;
auto res = drmModeGetResources(fd);
if (!res) {
close(fd);
return false;
}
bool is_kms = res->count_crtcs > 0 && res->count_connectors > 0 &&
res->count_encoders > 0;
drmModeFreeResources(res);
close(fd);
return is_kms;
}
DrmDevice *ResourceManager::GetDrmDevice(int display) {
for (auto &drm : drms_) {
if (drm->HandlesDisplay(display))
return drm.get();
}
return NULL;
}
std::shared_ptr<Importer> ResourceManager::GetImporter(int display) {
for (unsigned int i = 0; i < drms_.size(); i++) {
if (drms_[i]->HandlesDisplay(display))
return importers_[i];
}
return NULL;
}
const gralloc_module_t *ResourceManager::gralloc() {
return gralloc_;
}
} // namespace android
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