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SPU: Implement "double" SNR storage

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This commit is contained in:
Eladash 2022-05-30 09:05:18 +03:00 • committed by Ivan
parent dc80d000aa
commit d0e9108800
2 changed files with 82 additions and 65 deletions
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22
rpcs3/Emu/Cell/SPUThread.cpp
View file

@ -1695,7 +1695,7 @@ void spu_thread::push_snr(u32 number, u32 value)
// Prepare some data
const u32 event_bit = SPU_EVENT_S1 >> (number & 1);
const u32 bitor_bit = (snr_config >> number) & 1;
const bool bitor_bit = !!((snr_config >> number) & 1);
// Redundant, g_use_rtm is checked inside tx_start now.
if (g_use_rtm)
@ -1705,10 +1705,16 @@ void spu_thread::push_snr(u32 number, u32 value)
const bool ok = utils::tx_start([&]
{
channel_notify = (channel->data.raw() & spu_channel::bit_wait) != 0;
channel_notify = (channel->data.raw() == spu_channel::bit_wait);
thread_notify = (channel->data.raw() & spu_channel::bit_count) == 0;
if (bitor_bit)
if (channel_notify)
{
ensure(channel->jostling_value.raw() == spu_channel::bit_wait);
channel->jostling_value.raw() = value;
channel->data.raw() = 0;
}
else if (bitor_bit)
{
channel->data.raw() &= ~spu_channel::bit_wait;
channel->data.raw() |= spu_channel::bit_count | value;
@ -1752,16 +1758,8 @@ void spu_thread::push_snr(u32 number, u32 value)
});
// Check corresponding SNR register settings
if (bitor_bit)
{
if (channel->push_or(value))
if (channel->push(value, bitor_bit))
set_events(event_bit);
}
else
{
if (channel->push(value))
set_events(event_bit);
}
ch_events.atomic_op([](ch_events_t& ev)
{

93
rpcs3/Emu/Cell/SPUThread.h
View file

@ -166,13 +166,13 @@ enum : u32
SPU_FAKE_BASE_ADDR = 0xE8000000,
};
struct spu_channel
struct alignas(16) spu_channel
{
// Low 32 bits contain value
atomic_t<u64> data;
// Pending value to be inserted when it is possible at pop()
atomic_t<u32> jostling_value;
// Pending value to be inserted when it is possible in pop() or pop_wait()
atomic_t<u64> jostling_value;
public:
static constexpr u32 off_wait = 32;
@ -195,39 +195,49 @@ public:
}).second;
}
// Push performing bitwise OR with previous value, may require notification
bool push_or(u32 value)
// Push unconditionally, may require notification
// Performing bitwise OR with previous value if specified, otherwise overwiting it
bool push(u32 value, bool to_or = false)
{
const u64 old = data.fetch_op([value](u64& data)
while (true)
{
const auto [old, pushed_to_data] = data.fetch_op([&](u64& data)
{
if (data == bit_wait)
{
return false;
}
if (to_or)
{
data &= ~bit_wait;
data |= bit_count | value;
}
else
{
data = bit_count | value;
}
return true;
});
if (old & bit_wait)
if (!pushed_to_data)
{
// Insert the pending value in special storage for waiting SPUs, leave no time in which the channel has data
if (!jostling_value.compare_and_swap_test(bit_wait, value))
{
// Other thread has inserted a value through jostling_value, retry
continue;
}
// Turn off waiting bit manually (must succeed because waiting bit can only be resetted by the thread pushed to jostling_value)
ensure(this->data.bit_test_reset(off_wait));
}
data.notify_one();
// Return true if count has changed from 0 to 1, this condition is considered satisfied even if we pushed a value directly to the special storage for waiting SPUs
return !pushed_to_data || (old & bit_count) == 0;
}
return (old & bit_count) == 0;
}
bool push_and(u32 value)
{
return (data.fetch_and(~u64{value}) & value) != 0;
}
// Push unconditionally (overwriting previous value), may require notification
bool push(u32 value)
{
const u64 old = data.exchange(bit_count | value);
if (old & bit_wait)
{
data.notify_one();
}
return (old & bit_count) == 0;
}
// Returns true on success
@ -250,10 +260,10 @@ public:
bool try_read(u32& out) const
{
const u64 old = data.load();
out = static_cast<u32>(old);
if (old & bit_count) [[likely]]
{
out = static_cast<u32>(old);
return true;
}
@ -272,7 +282,7 @@ public:
if ((data & mask) == mask)
{
// Insert the pending value, leave no time in which the channel has no data
data = bit_count | jostling_value;
data = bit_count | static_cast<u32>(jostling_value);
return;
}
@ -290,9 +300,7 @@ public:
// Waiting for channel pop state availability, actually popping if specified
s64 pop_wait(cpu_thread& spu, bool pop = true)
{
while (true)
{
const u64 old = data.fetch_op([&](u64& data)
u64 old = data.fetch_op([&](u64& data)
{
if (data & bit_count) [[likely]]
{
@ -306,6 +314,7 @@ public:
}
data = bit_wait;
jostling_value.release(bit_wait);
return true;
}).first;
@ -314,17 +323,27 @@ public:
return static_cast<u32>(old);
}
while (true)
{
thread_ctrl::wait_on(data, bit_wait);
old = data;
if (!(old & bit_wait))
{
return static_cast<u32>(jostling_value);
}
if (spu.is_stopped())
{
if (u64 old2 = data.exchange(0); old2 & bit_count)
// Abort waiting and test if a value has been received
if (u64 v = jostling_value.exchange(0); !(v & bit_wait))
{
return static_cast<u32>(old2);
return static_cast<u32>(v);
}
ensure(data.bit_test_reset(off_wait));
return -1;
}
thread_ctrl::wait_on(data, bit_wait);
}
}