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| 1 | +/* |
| 2 | + * Copyright 2025 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 ATRACE_TAG ATRACE_TAG_GRAPHICS |
| 18 | + |
| 19 | +#include "allocator.h" |
| 20 | + |
| 21 | +#include <stdlib.h> |
| 22 | + |
| 23 | +#include <algorithm> |
| 24 | + |
| 25 | +#include <log/log.h> |
| 26 | + |
| 27 | +// #define ENABLE_ALLOC_CALLSTACKS 1 |
| 28 | +#if ENABLE_ALLOC_CALLSTACKS |
| 29 | +#include <utils/CallStack.h> |
| 30 | +#define ALOGD_CALLSTACK(...) \ |
| 31 | + do { \ |
| 32 | + ALOGD(__VA_ARGS__); \ |
| 33 | + android::CallStack callstack; \ |
| 34 | + callstack.update(); \ |
| 35 | + callstack.log(LOG_TAG, ANDROID_LOG_DEBUG, " "); \ |
| 36 | + } while (false) |
| 37 | +#else |
| 38 | +#define ALOGD_CALLSTACK(...) \ |
| 39 | + do { \ |
| 40 | + } while (false) |
| 41 | +#endif |
| 42 | + |
| 43 | +namespace vulkan { |
| 44 | +namespace driver { |
| 45 | + |
| 46 | +namespace { |
| 47 | + |
| 48 | +VKAPI_ATTR void* DefaultAllocate(void*, |
| 49 | + size_t size, |
| 50 | + size_t alignment, |
| 51 | + VkSystemAllocationScope) { |
| 52 | + void* ptr = nullptr; |
| 53 | + // Vulkan requires 'alignment' to be a power of two, but posix_memalign |
| 54 | + // additionally requires that it be at least sizeof(void*). |
| 55 | + int ret = posix_memalign(&ptr, std::max(alignment, sizeof(void*)), size); |
| 56 | + ALOGD_CALLSTACK("Allocate: size=%zu align=%zu => (%d) %p", size, alignment, |
| 57 | + ret, ptr); |
| 58 | + return ret == 0 ? ptr : nullptr; |
| 59 | +} |
| 60 | + |
| 61 | +// This function is marked `noinline` so that LLVM can't infer an object size |
| 62 | +// for FORTIFY through it, given that it's abusing malloc_usable_size(). |
| 63 | +__attribute__((__noinline__)) |
| 64 | +VKAPI_ATTR void* DefaultReallocate(void*, |
| 65 | + void* ptr, |
| 66 | + size_t size, |
| 67 | + size_t alignment, |
| 68 | + VkSystemAllocationScope) { |
| 69 | + if (size == 0) { |
| 70 | + free(ptr); |
| 71 | + return nullptr; |
| 72 | + } |
| 73 | + |
| 74 | + // TODO(b/143295633): Right now we never shrink allocations; if the new |
| 75 | + // request is smaller than the existing chunk, we just continue using it. |
| 76 | + // Right now the loader never reallocs, so this doesn't matter. If that |
| 77 | + // changes, or if this code is copied into some other project, this should |
| 78 | + // probably have a heuristic to allocate-copy-free when doing so will save |
| 79 | + // "enough" space. |
| 80 | + size_t old_size = ptr ? malloc_usable_size(ptr) : 0; |
| 81 | + if (size <= old_size) |
| 82 | + return ptr; |
| 83 | + |
| 84 | + void* new_ptr = nullptr; |
| 85 | + if (posix_memalign(&new_ptr, std::max(alignment, sizeof(void*)), size) != 0) |
| 86 | + return nullptr; |
| 87 | + if (ptr) { |
| 88 | + memcpy(new_ptr, ptr, std::min(old_size, size)); |
| 89 | + free(ptr); |
| 90 | + } |
| 91 | + return new_ptr; |
| 92 | +} |
| 93 | + |
| 94 | +VKAPI_ATTR void DefaultFree(void*, void* ptr) { |
| 95 | + ALOGD_CALLSTACK("Free: %p", ptr); |
| 96 | + free(ptr); |
| 97 | +} |
| 98 | + |
| 99 | +} // anonymous namespace |
| 100 | + |
| 101 | +const VkAllocationCallbacks& GetDefaultAllocator() { |
| 102 | + static const VkAllocationCallbacks kDefaultAllocCallbacks = { |
| 103 | + .pUserData = nullptr, |
| 104 | + .pfnAllocation = DefaultAllocate, |
| 105 | + .pfnReallocation = DefaultReallocate, |
| 106 | + .pfnFree = DefaultFree, |
| 107 | + }; |
| 108 | + |
| 109 | + return kDefaultAllocCallbacks; |
| 110 | +} |
| 111 | + |
| 112 | +} // namespace driver |
| 113 | +} // namespace vulkan |
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