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      1 /*
      2  * Copyright 2017 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_NDEBUG 1
     18 #define LOG_TAG "GraphicsEnv"
     19 #include <graphicsenv/GraphicsEnv.h>
     20 
     21 #include <mutex>
     22 
     23 #include <log/log.h>
     24 #include <nativeloader/dlext_namespaces.h>
     25 
     26 // TODO(b/37049319) Get this from a header once one exists
     27 extern "C" {
     28   android_namespace_t* android_get_exported_namespace(const char*);
     29 }
     30 
     31 namespace android {
     32 
     33 /*static*/ GraphicsEnv& GraphicsEnv::getInstance() {
     34     static GraphicsEnv env;
     35     return env;
     36 }
     37 
     38 void GraphicsEnv::setDriverPath(const std::string path) {
     39     if (!mDriverPath.empty()) {
     40         ALOGV("ignoring attempt to change driver path from '%s' to '%s'",
     41                 mDriverPath.c_str(), path.c_str());
     42         return;
     43     }
     44     ALOGV("setting driver path to '%s'", path.c_str());
     45     mDriverPath = path;
     46 }
     47 
     48 android_namespace_t* GraphicsEnv::getDriverNamespace() {
     49     static std::once_flag once;
     50     std::call_once(once, [this]() {
     51         if (mDriverPath.empty())
     52             return;
     53         // If the sphal namespace isn't configured for a device, don't support updatable drivers.
     54         // We need a parent namespace to inherit the default search path from.
     55         auto sphalNamespace = android_get_exported_namespace("sphal");
     56         if (!sphalNamespace) return;
     57         mDriverNamespace = android_create_namespace("gfx driver",
     58                                                     nullptr,             // ld_library_path
     59                                                     mDriverPath.c_str(), // default_library_path
     60                                                     ANDROID_NAMESPACE_TYPE_SHARED |
     61                                                             ANDROID_NAMESPACE_TYPE_ISOLATED,
     62                                                     nullptr, // permitted_when_isolated_path
     63                                                     sphalNamespace);
     64     });
     65     return mDriverNamespace;
     66 }
     67 
     68 } // namespace android
     69 
     70 extern "C" android_namespace_t* android_getDriverNamespace() {
     71     return android::GraphicsEnv::getInstance().getDriverNamespace();
     72 }
     73