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使用 DMA-BUF 分配内存，修复功能bug

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sladro 2025-12-26 16:17:25 +08:00
parent c747942855
commit cee65540d8
1 changed files with 18 additions and 2 deletions
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20
src/utils/dma_alloc.cpp
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@ -80,27 +80,43 @@ DmaBuffer& DmaBuffer::operator=(DmaBuffer&& other) noexcept {
DmaBufferPtr DmaAlloc(size_t alloc_size) {
#if defined(__linux__)
// Try different dma_heap devices
// Try different dma_heap devices - prefer CMA for RGA compatibility (<4GB)
const char* heap_paths[] = {
"/dev/dma_heap/cma",
"/dev/dma_heap/cma-uncached",
"/dev/dma_heap/linux,cma",
"/dev/dma_heap/reserved",
"/dev/dma_heap/system-uncached",
"/dev/dma_heap/system",
"/dev/dma_heap/cma",
nullptr
};
int heap_fd = -1;
const char* used_heap = nullptr;
for (int i = 0; heap_paths[i] != nullptr; ++i) {
heap_fd = open(heap_paths[i], O_RDWR | O_CLOEXEC);
if (heap_fd >= 0) {
used_heap = heap_paths[i];
break;
}
}
if (heap_fd < 0) {
std::cerr << "[DmaAlloc] failed to open dma_heap device: " << strerror(errno) << "\n";
std::cerr << "[DmaAlloc] tried: ";
for (int i = 0; heap_paths[i] != nullptr; ++i) {
std::cerr << heap_paths[i] << " ";
}
std::cerr << "\n";
return nullptr;
}
static bool first_alloc = true;
if (first_alloc) {
std::cout << "[DmaAlloc] using heap: " << used_heap << "\n";
first_alloc = false;
}
dma_heap_allocation_data alloc_data{};
alloc_data.len = alloc_size;
alloc_data.fd_flags = O_RDWR | O_CLOEXEC;