layers_extensions.cpp revision d0b7cb566288a4f6646e356a17188b7922ba5740 
1/*
2 * Copyright 2016 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 0
18
19#include "loader.h"
20#include <alloca.h>
21#include <dirent.h>
22#include <dlfcn.h>
23#include <mutex>
24#include <sys/prctl.h>
25#include <string>
26#include <string.h>
27#include <vector>
28#include <log/log.h>
29#include <vulkan/vulkan_loader_data.h>
30
31using namespace vulkan;
32
33// TODO(jessehall): The whole way we deal with extensions is pretty hokey, and
34// not a good long-term solution. Having a hard-coded enum of extensions is
35// bad, of course. Representing sets of extensions (requested, supported, etc.)
36// as a bitset isn't necessarily bad, if the mapping from extension to bit were
37// dynamic. Need to rethink this completely when there's a little more time.
38
39// TODO(jessehall): This file currently builds up global data structures as it
40// loads, and never cleans them up. This means we're doing heap allocations
41// without going through an app-provided allocator, but worse, we'll leak those
42// allocations if the loader is unloaded.
43//
44// We should allocate "enough" BSS space, and suballocate from there. Will
45// probably want to intern strings, etc., and will need some custom/manual data
46// structures.
47
48// TODO(jessehall): Currently we have separate lists for instance and device
49// layers. Most layers are both; we should use one entry for each layer name,
50// with a mask saying what kind(s) it is.
51
52namespace vulkan {
53struct Layer {
54    VkLayerProperties properties;
55    size_t library_idx;
56    std::vector<VkExtensionProperties> extensions;
57};
58}  // namespace vulkan
59
60namespace {
61
62std::mutex g_library_mutex;
63struct LayerLibrary {
64    std::string path;
65    void* dlhandle;
66    size_t refcount;
67};
68std::vector<LayerLibrary> g_layer_libraries;
69std::vector<Layer> g_instance_layers;
70std::vector<Layer> g_device_layers;
71
72void AddLayerLibrary(const std::string& path) {
73    ALOGV("examining layer library '%s'", path.c_str());
74
75    void* dlhandle = dlopen(path.c_str(), RTLD_NOW | RTLD_LOCAL);
76    if (!dlhandle) {
77        ALOGW("failed to load layer library '%s': %s", path.c_str(), dlerror());
78        return;
79    }
80
81    PFN_vkEnumerateInstanceLayerProperties enumerate_instance_layers =
82        reinterpret_cast<PFN_vkEnumerateInstanceLayerProperties>(
83            dlsym(dlhandle, "vkEnumerateInstanceLayerProperties"));
84    PFN_vkEnumerateInstanceExtensionProperties enumerate_instance_extensions =
85        reinterpret_cast<PFN_vkEnumerateInstanceExtensionProperties>(
86            dlsym(dlhandle, "vkEnumerateInstanceExtensionProperties"));
87    PFN_vkEnumerateDeviceLayerProperties enumerate_device_layers =
88        reinterpret_cast<PFN_vkEnumerateDeviceLayerProperties>(
89            dlsym(dlhandle, "vkEnumerateDeviceLayerProperties"));
90    PFN_vkEnumerateDeviceExtensionProperties enumerate_device_extensions =
91        reinterpret_cast<PFN_vkEnumerateDeviceExtensionProperties>(
92            dlsym(dlhandle, "vkEnumerateDeviceExtensionProperties"));
93    if (!((enumerate_instance_layers && enumerate_instance_extensions) ||
94          (enumerate_device_layers && enumerate_device_extensions))) {
95        ALOGV(
96            "layer library '%s' has neither instance nor device enumeraion "
97            "functions",
98            path.c_str());
99        dlclose(dlhandle);
100        return;
101    }
102
103    VkResult result;
104    uint32_t num_instance_layers = 0;
105    uint32_t num_device_layers = 0;
106    if (enumerate_instance_layers) {
107        result = enumerate_instance_layers(&num_instance_layers, nullptr);
108        if (result != VK_SUCCESS) {
109            ALOGW(
110                "vkEnumerateInstanceLayerProperties failed for library '%s': "
111                "%d",
112                path.c_str(), result);
113            dlclose(dlhandle);
114            return;
115        }
116    }
117    if (enumerate_device_layers) {
118        result = enumerate_device_layers(VK_NULL_HANDLE, &num_device_layers,
119                                         nullptr);
120        if (result != VK_SUCCESS) {
121            ALOGW(
122                "vkEnumerateDeviceLayerProperties failed for library '%s': %d",
123                path.c_str(), result);
124            dlclose(dlhandle);
125            return;
126        }
127    }
128    VkLayerProperties* properties = static_cast<VkLayerProperties*>(alloca(
129        (num_instance_layers + num_device_layers) * sizeof(VkLayerProperties)));
130    if (num_instance_layers > 0) {
131        result = enumerate_instance_layers(&num_instance_layers, properties);
132        if (result != VK_SUCCESS) {
133            ALOGW(
134                "vkEnumerateInstanceLayerProperties failed for library '%s': "
135                "%d",
136                path.c_str(), result);
137            dlclose(dlhandle);
138            return;
139        }
140    }
141    if (num_device_layers > 0) {
142        result = enumerate_device_layers(VK_NULL_HANDLE, &num_device_layers,
143                                         properties + num_instance_layers);
144        if (result != VK_SUCCESS) {
145            ALOGW(
146                "vkEnumerateDeviceLayerProperties failed for library '%s': %d",
147                path.c_str(), result);
148            dlclose(dlhandle);
149            return;
150        }
151    }
152
153    size_t library_idx = g_layer_libraries.size();
154    size_t prev_num_instance_layers = g_instance_layers.size();
155    size_t prev_num_device_layers = g_device_layers.size();
156    g_instance_layers.reserve(prev_num_instance_layers + num_instance_layers);
157    g_device_layers.reserve(prev_num_device_layers + num_device_layers);
158    for (size_t i = 0; i < num_instance_layers; i++) {
159        const VkLayerProperties& props = properties[i];
160
161        Layer layer;
162        layer.properties = props;
163        layer.library_idx = library_idx;
164
165        if (enumerate_instance_extensions) {
166            uint32_t count = 0;
167            result =
168                enumerate_instance_extensions(props.layerName, &count, nullptr);
169            if (result != VK_SUCCESS) {
170                ALOGW(
171                    "vkEnumerateInstanceExtensionProperties(%s) failed for "
172                    "library "
173                    "'%s': %d",
174                    props.layerName, path.c_str(), result);
175                g_instance_layers.resize(prev_num_instance_layers);
176                dlclose(dlhandle);
177                return;
178            }
179            layer.extensions.resize(count);
180            result = enumerate_instance_extensions(props.layerName, &count,
181                                                   layer.extensions.data());
182            if (result != VK_SUCCESS) {
183                ALOGW(
184                    "vkEnumerateInstanceExtensionProperties(%s) failed for "
185                    "library "
186                    "'%s': %d",
187                    props.layerName, path.c_str(), result);
188                g_instance_layers.resize(prev_num_instance_layers);
189                dlclose(dlhandle);
190                return;
191            }
192        }
193
194        g_instance_layers.push_back(layer);
195        ALOGV("  added instance layer '%s'", props.layerName);
196    }
197    for (size_t i = 0; i < num_device_layers; i++) {
198        const VkLayerProperties& props = properties[num_instance_layers + i];
199
200        Layer layer;
201        layer.properties = props;
202        layer.library_idx = library_idx;
203
204        if (enumerate_device_extensions) {
205            uint32_t count;
206            result = enumerate_device_extensions(
207                VK_NULL_HANDLE, props.layerName, &count, nullptr);
208            if (result != VK_SUCCESS) {
209                ALOGW(
210                    "vkEnumerateDeviceExtensionProperties(%s) failed for "
211                    "library "
212                    "'%s': %d",
213                    props.layerName, path.c_str(), result);
214                g_instance_layers.resize(prev_num_instance_layers);
215                g_device_layers.resize(prev_num_device_layers);
216                dlclose(dlhandle);
217                return;
218            }
219            layer.extensions.resize(count);
220            result =
221                enumerate_device_extensions(VK_NULL_HANDLE, props.layerName,
222                                            &count, layer.extensions.data());
223            if (result != VK_SUCCESS) {
224                ALOGW(
225                    "vkEnumerateDeviceExtensionProperties(%s) failed for "
226                    "library "
227                    "'%s': %d",
228                    props.layerName, path.c_str(), result);
229                g_instance_layers.resize(prev_num_instance_layers);
230                g_device_layers.resize(prev_num_device_layers);
231                dlclose(dlhandle);
232                return;
233            }
234        }
235
236        g_device_layers.push_back(layer);
237        ALOGV("  added device layer '%s'", props.layerName);
238    }
239
240    dlclose(dlhandle);
241
242    g_layer_libraries.push_back(LayerLibrary{path, nullptr, 0});
243}
244
245void DiscoverLayersInDirectory(const std::string& dir_path) {
246    ALOGV("looking for layers in '%s'", dir_path.c_str());
247
248    DIR* directory = opendir(dir_path.c_str());
249    if (!directory) {
250        int err = errno;
251        ALOGV_IF(err != ENOENT, "failed to open layer directory '%s': %s (%d)",
252                 dir_path.c_str(), strerror(err), err);
253        return;
254    }
255
256    std::string path;
257    path.reserve(dir_path.size() + 20);
258    path.append(dir_path);
259    path.append("/");
260
261    struct dirent* entry;
262    while ((entry = readdir(directory))) {
263        size_t libname_len = strlen(entry->d_name);
264        if (strncmp(entry->d_name, "libVkLayer", 10) != 0 ||
265            strncmp(entry->d_name + libname_len - 3, ".so", 3) != 0)
266            continue;
267        path.append(entry->d_name);
268        AddLayerLibrary(path);
269        path.resize(dir_path.size() + 1);
270    }
271
272    closedir(directory);
273}
274
275void* GetLayerGetProcAddr(const Layer& layer,
276                          const char* gpa_name,
277                          size_t gpa_name_len) {
278    const LayerLibrary& library = g_layer_libraries[layer.library_idx];
279    void* gpa;
280    size_t layer_name_len = std::max(size_t{2}, strlen(layer.properties.layerName));
281    char* name = static_cast<char*>(alloca(layer_name_len + gpa_name_len + 1));
282    strcpy(name, layer.properties.layerName);
283    strcpy(name + layer_name_len, gpa_name);
284    if (!(gpa = dlsym(library.dlhandle, name))) {
285        strcpy(name, "vk");
286        strcpy(name + 2, gpa_name);
287        gpa = dlsym(library.dlhandle, name);
288    }
289    return gpa;
290}
291
292uint32_t EnumerateLayers(const std::vector<Layer>& layers,
293                         uint32_t count,
294                         VkLayerProperties* properties) {
295    uint32_t n = std::min(count, static_cast<uint32_t>(layers.size()));
296    for (uint32_t i = 0; i < n; i++) {
297        properties[i] = layers[i].properties;
298    }
299    return static_cast<uint32_t>(layers.size());
300}
301
302void GetLayerExtensions(const std::vector<Layer>& layers,
303                        const char* name,
304                        const VkExtensionProperties** properties,
305                        uint32_t* count) {
306    auto layer =
307        std::find_if(layers.cbegin(), layers.cend(), [=](const Layer& entry) {
308            return strcmp(entry.properties.layerName, name) == 0;
309        });
310    if (layer == layers.cend()) {
311        *properties = nullptr;
312        *count = 0;
313    } else {
314        *properties = layer->extensions.data();
315        *count = static_cast<uint32_t>(layer->extensions.size());
316    }
317}
318
319LayerRef GetLayerRef(std::vector<Layer>& layers, const char* name) {
320    for (uint32_t id = 0; id < layers.size(); id++) {
321        if (strcmp(name, layers[id].properties.layerName) == 0) {
322            LayerLibrary& library = g_layer_libraries[layers[id].library_idx];
323            std::lock_guard<std::mutex> lock(g_library_mutex);
324            if (library.refcount++ == 0) {
325                library.dlhandle =
326                    dlopen(library.path.c_str(), RTLD_NOW | RTLD_LOCAL);
327                if (!library.dlhandle) {
328                    ALOGE("failed to load layer library '%s': %s",
329                          library.path.c_str(), dlerror());
330                    library.refcount = 0;
331                    return LayerRef(nullptr);
332                }
333            }
334            return LayerRef(&layers[id]);
335        }
336    }
337    return LayerRef(nullptr);
338}
339
340}  // anonymous namespace
341
342namespace vulkan {
343
344void DiscoverLayers() {
345    if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0))
346        DiscoverLayersInDirectory("/data/local/debug/vulkan");
347    if (!LoaderData::GetInstance().layer_path.empty())
348        DiscoverLayersInDirectory(LoaderData::GetInstance().layer_path.c_str());
349}
350
351uint32_t EnumerateInstanceLayers(uint32_t count,
352                                 VkLayerProperties* properties) {
353    return EnumerateLayers(g_instance_layers, count, properties);
354}
355
356uint32_t EnumerateDeviceLayers(uint32_t count, VkLayerProperties* properties) {
357    return EnumerateLayers(g_device_layers, count, properties);
358}
359
360void GetInstanceLayerExtensions(const char* name,
361                                const VkExtensionProperties** properties,
362                                uint32_t* count) {
363    GetLayerExtensions(g_instance_layers, name, properties, count);
364}
365
366void GetDeviceLayerExtensions(const char* name,
367                              const VkExtensionProperties** properties,
368                              uint32_t* count) {
369    GetLayerExtensions(g_device_layers, name, properties, count);
370}
371
372LayerRef GetInstanceLayerRef(const char* name) {
373    return GetLayerRef(g_instance_layers, name);
374}
375
376LayerRef GetDeviceLayerRef(const char* name) {
377    return GetLayerRef(g_device_layers, name);
378}
379
380LayerRef::LayerRef(Layer* layer) : layer_(layer) {}
381
382LayerRef::~LayerRef() {
383    if (layer_) {
384        LayerLibrary& library = g_layer_libraries[layer_->library_idx];
385        std::lock_guard<std::mutex> lock(g_library_mutex);
386        if (--library.refcount == 0) {
387            dlclose(library.dlhandle);
388            library.dlhandle = nullptr;
389        }
390    }
391}
392
393LayerRef::LayerRef(LayerRef&& other) : layer_(std::move(other.layer_)) {}
394
395PFN_vkGetInstanceProcAddr LayerRef::GetGetInstanceProcAddr() const {
396    return layer_ ? reinterpret_cast<PFN_vkGetInstanceProcAddr>(
397                        GetLayerGetProcAddr(*layer_, "GetInstanceProcAddr", 19))
398                  : nullptr;
399}
400
401PFN_vkGetDeviceProcAddr LayerRef::GetGetDeviceProcAddr() const {
402    return layer_ ? reinterpret_cast<PFN_vkGetDeviceProcAddr>(
403                        GetLayerGetProcAddr(*layer_, "GetDeviceProcAddr", 17))
404                  : nullptr;
405}
406
407bool LayerRef::SupportsExtension(const char* name) const {
408    return std::find_if(layer_->extensions.cbegin(), layer_->extensions.cend(),
409                        [=](const VkExtensionProperties& ext) {
410                            return strcmp(ext.extensionName, name) == 0;
411                        }) != layer_->extensions.cend();
412}
413
414InstanceExtension InstanceExtensionFromName(const char* name) {
415    if (strcmp(name, VK_KHR_SURFACE_EXTENSION_NAME) == 0)
416        return kKHR_surface;
417    if (strcmp(name, VK_KHR_ANDROID_SURFACE_EXTENSION_NAME) == 0)
418        return kKHR_android_surface;
419    if (strcmp(name, VK_EXT_DEBUG_REPORT_EXTENSION_NAME) == 0)
420        return kEXT_debug_report;
421    return kInstanceExtensionCount;
422}
423
424DeviceExtension DeviceExtensionFromName(const char* name) {
425    if (strcmp(name, VK_KHR_SWAPCHAIN_EXTENSION_NAME) == 0)
426        return kKHR_swapchain;
427    if (strcmp(name, VK_ANDROID_NATIVE_BUFFER_EXTENSION_NAME) == 0)
428        return kANDROID_native_buffer;
429    return kDeviceExtensionCount;
430}
431
432}  // namespace vulkan
433