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GPU: Implemented nvhost-as-gpu's UnmapBuffer ioctl.

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It removes a mapping previously created with the MapBufferEx ioctl.
This commit is contained in:
Subv
2018-05-20 14:21:06 -05:00
parent 1b5c02fc37
commit 72b5c448cf
4 changed files with 70 additions and 0 deletions
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19
src/video_core/memory_manager.cpp
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@ -58,6 +58,25 @@ GPUVAddr MemoryManager::MapBufferEx(VAddr cpu_addr, GPUVAddr gpu_addr, u64 size)
return gpu_addr;
}
GPUVAddr MemoryManager::UnmapBuffer(GPUVAddr gpu_addr, u64 size) {
ASSERT((gpu_addr & PAGE_MASK) == 0);
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(gpu_addr + offset) != static_cast<u64>(PageStatus::Allocated) &&
PageSlot(gpu_addr + offset) != static_cast<u64>(PageStatus::Unmapped));
PageSlot(gpu_addr + offset) = static_cast<u64>(PageStatus::Unmapped);
}
// Delete the region mappings that are contained within the unmapped region
mapped_regions.erase(std::remove_if(mapped_regions.begin(), mapped_regions.end(),
[&](const MappedRegion& region) {
return region.gpu_addr <= gpu_addr &&
region.gpu_addr + region.size < gpu_addr + size;
}),
mapped_regions.end());
return gpu_addr;
}
boost::optional<GPUVAddr> MemoryManager::FindFreeBlock(u64 size, u64 align) {
GPUVAddr gpu_addr = 0;
u64 free_space = 0;