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RawSPU: Fix race of SPU_MBox_Status_offs (#17303)

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Elad 2025-06-13 18:56:35 +03:00 committed by GitHub
parent ab55500f01
commit 85c813d84c
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1 changed files with 23 additions and 1 deletions
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24
rpcs3/Emu/Cell/RawSPUThread.cpp
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@ -138,7 +138,29 @@ bool spu_thread::read_reg(const u32 addr, u32& value)
case SPU_MBox_Status_offs:
{
value = (ch_out_mbox.get_count() & 0xff) | ((4 - ch_in_mbox.get_count()) << 8 & 0xff00) | (ch_out_intr_mbox.get_count() << 16 & 0xff0000);
// Load channel counts atomically
auto counts = std::make_tuple(ch_out_mbox.get_count(), ch_in_mbox.get_count(), ch_out_intr_mbox.get_count());
while (true)
{
atomic_fence_acquire();
const auto counts_check = std::make_tuple(ch_out_mbox.get_count(), ch_in_mbox.get_count(), ch_out_intr_mbox.get_count());
if (counts_check == counts)
{
break;
}
// Update and reload
counts = counts_check;
}
const u32 out_mbox = std::get<0>(counts);
const u32 in_mbox = 4 - std::get<1>(counts);
const u32 intr_mbox = std::get<2>(counts);
value = (out_mbox & 0xff) | ((in_mbox << 8) & 0xff00) | ((intr_mbox << 16) & 0xff0000);
return true;
}