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nvhost_nvdec_common: Stub UnmapBuffer Ioctl

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Skip unmapping nvdec buffers to avoid breaking the continuity of the VP9 reference frame addresses, and the risk of invalidating data before the async GPU thread is done with it.
This commit is contained in:
ameerj 2021-08-06 20:06:30 -04:00
parent 7cf0958b06
commit cc8ac112fc
1 changed files with 4 additions and 23 deletions
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27
src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.cpp
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@ -178,30 +178,11 @@ NvResult nvhost_nvdec_common::MapBuffer(const std::vector<u8>& input, std::vecto
}
NvResult nvhost_nvdec_common::UnmapBuffer(const std::vector<u8>& input, std::vector<u8>& output) {
IoctlMapBuffer params{};
std::memcpy(&params, input.data(), sizeof(IoctlMapBuffer));
std::vector<MapBufferEntry> cmd_buffer_handles(params.num_entries);
SliceVectors(input, cmd_buffer_handles, params.num_entries, sizeof(IoctlMapBuffer));
auto& gpu = system.GPU();
for (auto& cmd_buffer : cmd_buffer_handles) {
const auto object{nvmap_dev->GetObject(cmd_buffer.map_handle)};
if (!object) {
LOG_ERROR(Service_NVDRV, "invalid cmd_buffer nvmap_handle={:X}", cmd_buffer.map_handle);
std::memcpy(output.data(), &params, output.size());
return NvResult::InvalidState;
}
if (const auto size{RemoveBufferMap(object->dma_map_addr)}; size) {
gpu.MemoryManager().Unmap(object->dma_map_addr, *size);
} else {
// This occurs quite frequently, however does not seem to impact functionality
LOG_DEBUG(Service_NVDRV, "invalid offset=0x{:X} dma=0x{:X}", object->addr,
object->dma_map_addr);
}
object->dma_map_addr = 0;
}
// This is intntionally stubbed.
// Skip unmapping buffers here, as to not break the continuity of the VP9 reference frame
// addresses, and risk invalidating data before the async GPU thread is done with it
std::memset(output.data(), 0, output.size());
LOG_DEBUG(Service_NVDRV, "(STUBBED) called");
return NvResult::Success;
}