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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 <android/dlext.h>
     24 #include <log/log.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   android_namespace_t* android_create_namespace(const char* name,
     30                                                 const char* ld_library_path,
     31                                                 const char* default_library_path,
     32                                                 uint64_t type,
     33                                                 const char* permitted_when_isolated_path,
     34                                                 android_namespace_t* parent);
     35 
     36   enum {
     37      ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
     38      ANDROID_NAMESPACE_TYPE_SHARED = 2,
     39   };
     40 }
     41 
     42 namespace android {
     43 
     44 /*static*/ GraphicsEnv& GraphicsEnv::getInstance() {
     45     static GraphicsEnv env;
     46     return env;
     47 }
     48 
     49 void GraphicsEnv::setDriverPath(const std::string path) {
     50     if (!mDriverPath.empty()) {
     51         ALOGV("ignoring attempt to change driver path from '%s' to '%s'",
     52                 mDriverPath.c_str(), path.c_str());
     53         return;
     54     }
     55     ALOGV("setting driver path to '%s'", path.c_str());
     56     mDriverPath = path;
     57 }
     58 
     59 void GraphicsEnv::setLayerPaths(android_namespace_t* appNamespace, const std::string layerPaths) {
     60     if (mLayerPaths.empty()) {
     61         mLayerPaths = layerPaths;
     62         mAppNamespace = appNamespace;
     63     } else {
     64         ALOGV("Vulkan layer search path already set, not clobbering with '%s' for namespace %p'",
     65                 layerPaths.c_str(), appNamespace);
     66     }
     67 }
     68 
     69 android_namespace_t* GraphicsEnv::getAppNamespace() {
     70     return mAppNamespace;
     71 }
     72 
     73 const std::string GraphicsEnv::getLayerPaths(){
     74     return mLayerPaths;
     75 }
     76 
     77 const std::string GraphicsEnv::getDebugLayers() {
     78     return mDebugLayers;
     79 }
     80 
     81 void GraphicsEnv::setDebugLayers(const std::string layers) {
     82     mDebugLayers = layers;
     83 }
     84 
     85 android_namespace_t* GraphicsEnv::getDriverNamespace() {
     86     static std::once_flag once;
     87     std::call_once(once, [this]() {
     88         if (mDriverPath.empty())
     89             return;
     90         // If the sphal namespace isn't configured for a device, don't support updatable drivers.
     91         // We need a parent namespace to inherit the default search path from.
     92         auto sphalNamespace = android_get_exported_namespace("sphal");
     93         if (!sphalNamespace) return;
     94         mDriverNamespace = android_create_namespace("gfx driver",
     95                                                     nullptr,             // ld_library_path
     96                                                     mDriverPath.c_str(), // default_library_path
     97                                                     ANDROID_NAMESPACE_TYPE_SHARED |
     98                                                             ANDROID_NAMESPACE_TYPE_ISOLATED,
     99                                                     nullptr, // permitted_when_isolated_path
    100                                                     sphalNamespace);
    101     });
    102     return mDriverNamespace;
    103 }
    104 
    105 } // namespace android
    106 
    107 extern "C" android_namespace_t* android_getDriverNamespace() {
    108     return android::GraphicsEnv::getInstance().getDriverNamespace();
    109 }
    110