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Implement support for pushbuffer methods split across multiple GpEntries

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These are used heavily in OpenGL games, which now, together with the
previous syncpoint changes, work perfectly. The actual implementation is
rather novel as rather than using a per-class state machine for all
methods we only use it for those that are known to be split across
GpEntry boundaries, as a result only a single bounds check is added to
the hot path of contiguous method execution and the performance loss is
negligible.
This commit is contained in:
Billy Laws 2021-10-13 21:46:30 +01:00
parent fc017e1e95
commit b7d0f2fafa
4 changed files with 106 additions and 19 deletions
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4
app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.h
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@ -62,12 +62,12 @@ namespace skyline::service::nvdrv::device::nvhost {
using Allocator = FlatAllocator<u32, 0, 32>;
std::unique_ptr<Allocator> bigPageAllocator;
std::shared_ptr<Allocator> smallPageAllocator; // Shared as this is also used by nvhost::GpuChannel
std::shared_ptr<Allocator> smallPageAllocator; //! Shared as this is also used by nvhost::GpuChannel
bool initialised{};
} vm;
std::shared_ptr<soc::gm20b::AddressSpaceContext> asCtx;
std::shared_ptr<soc::gm20b::AddressSpaceContext> asCtx; //!< The guest GPU AS context that is associated with each particular instance
friend GpuChannel;

12
app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/gpu_channel.h
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@ -23,14 +23,14 @@ namespace skyline::service::nvdrv::device::nvhost {
std::shared_ptr<type::KEvent> smExceptionBreakpointPauseReportEvent;
std::shared_ptr<type::KEvent> errorNotifierEvent;
std::shared_ptr<soc::gm20b::AddressSpaceContext> asCtx;
std::shared_ptr<AsGpu::VM::Allocator> asAllocator;
std::unique_ptr<soc::gm20b::ChannelContext> channelCtx;
std::shared_ptr<soc::gm20b::AddressSpaceContext> asCtx; //!< The guest GPU AS context submits from this channel are bound to
std::shared_ptr<AsGpu::VM::Allocator> asAllocator; //!< The small page allocator context for the AS that's bound to this channel, used to allocate space for `pushBufferMemory`
std::unique_ptr<soc::gm20b::ChannelContext> channelCtx; //!< The entire guest GPU context specific to this channel
u64 pushBufferAddr{};
size_t pushBufferMemoryOffset{};
std::vector<u32> pushBufferMemory;
u64 pushBufferAddr{}; //!< The GPU address `pushBufferMemory` is mapped to
size_t pushBufferMemoryOffset{}; //!< The current offset for which to write new pushbuffer method data into for post-increment and pre-wait
std::vector<u32> pushBufferMemory; //!< Mapped into the guest GPU As and used to store method data for pre/post increment commands
friend AsGpu;

85
app/src/main/cpp/skyline/soc/gm20b/gpfifo.cpp
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@ -115,28 +115,92 @@ namespace skyline::soc::gm20b {
pushBufferData.resize(gpEntry.size);
channelCtx.asCtx->gmmu.Read<u32>(pushBufferData, gpEntry.Address());
for (auto entry{pushBufferData.begin()}; entry != pushBufferData.end(); entry++) {
// There will be at least one entry here
auto entry{pushBufferData.begin()};
// Executes the current split method, returning once execution is finished or the current GpEntry has reached its end
auto resumeSplitMethod{[&](){
switch (resumeState.state) {
case MethodResumeState::State::Inc:
while (entry != pushBufferData.end() && resumeState.remaining)
Send(resumeState.address++, *(entry++), resumeState.subChannel, --resumeState.remaining == 0);
break;
case MethodResumeState::State::OneInc:
Send(resumeState.address++, *(entry++), resumeState.subChannel, --resumeState.remaining == 0);
// After the first increment OneInc methods work the same as a NonInc method, this is needed so they can resume correctly if they are broken up by multiple GpEntries
resumeState.state = MethodResumeState::State::NonInc;
[[fallthrough]];
case MethodResumeState::State::NonInc:
while (entry != pushBufferData.end() && resumeState.remaining)
Send(resumeState.address, *(entry++), resumeState.subChannel, --resumeState.remaining == 0);
break;
}
}};
// We've a method from a previous GpEntry that needs resuming
if (resumeState.remaining)
resumeSplitMethod();
// Process more methods if the entries are still not all used up after handling resuming
for (; entry != pushBufferData.end(); entry++) {
// An entry containing all zeroes is a NOP, skip over it
if (*entry == 0)
continue;
PushBufferMethodHeader methodHeader{.raw = *entry};
// Needed in order to check for methods split across multiple GpEntries
auto remainingEntries{std::distance(entry, pushBufferData.end()) - 1};
// Handles storing state and initial execution for methods that are split across multiple GpEntries
auto startSplitMethod{[&](auto methodState) {
resumeState = {
.remaining = methodHeader.methodCount,
.address = methodHeader.methodAddress,
.subChannel = methodHeader.methodSubChannel,
.state = methodState
};
// Skip over method header as `resumeSplitMethod` doesn't expect it to be there
entry++;
resumeSplitMethod();
}};
switch (methodHeader.secOp) {
case PushBufferMethodHeader::SecOp::IncMethod:
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress + i, *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
if (remainingEntries >= methodHeader.methodCount) {
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress + i, *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
} else {
startSplitMethod(MethodResumeState::State::Inc);
return;
}
case PushBufferMethodHeader::SecOp::NonIncMethod:
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress, *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
if (remainingEntries >= methodHeader.methodCount) {
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress, *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
} else {
startSplitMethod(MethodResumeState::State::NonInc);
return;
}
case PushBufferMethodHeader::SecOp::OneInc:
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress + !!i, *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
if (remainingEntries >= methodHeader.methodCount) {
for (u32 i{}; i < methodHeader.methodCount; i++)
Send(methodHeader.methodAddress + (i ? 1 : 0), *++entry, methodHeader.methodSubChannel, i == methodHeader.methodCount - 1);
break;
} else {
startSplitMethod(MethodResumeState::State::OneInc);
return;
}
case PushBufferMethodHeader::SecOp::ImmdDataMethod:
Send(methodHeader.methodAddress, methodHeader.immdData, methodHeader.methodSubChannel, true);
break;
@ -154,6 +218,7 @@ namespace skyline::soc::gm20b {
pthread_setname_np(pthread_self(), "GPFIFO");
try {
signal::SetSignalHandler({SIGINT, SIGILL, SIGTRAP, SIGBUS, SIGFPE, SIGSEGV}, signal::ExceptionalSignalHandler);
gpEntries.Process([this](GpEntry gpEntry) {
state.logger->Debug("Processing pushbuffer: 0x{:X}, Size: 0x{:X}", gpEntry.Address(), +gpEntry.size);
Process(gpEntry);

24
app/src/main/cpp/skyline/soc/gm20b/gpfifo.h
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@ -87,6 +87,7 @@ namespace skyline::soc::gm20b {
* @url https://github.com/NVIDIA/open-gpu-doc/blob/ab27fc22db5de0d02a4cabe08e555663b62db4d4/manuals/volta/gv100/dev_pbdma.ref.txt#L62
*/
class ChannelGpfifo {
private:
const DeviceState &state;
ChannelContext &channelCtx;
engine::GPFIFO gpfifoEngine; //!< The engine for processing GPFIFO method calls
@ -94,11 +95,32 @@ namespace skyline::soc::gm20b {
std::thread thread; //!< The thread that manages processing of pushbuffers
std::vector<u32> pushBufferData; //!< Persistent vector storing pushbuffer data to avoid constant reallocations
/**
* @brief Holds the required state in order to resume a method started from one call to `Process` in another
* @note This is needed as games (especially OpenGL ones) can split method entries over multiple GpEntries
*/
struct MethodResumeState {
u32 remaining; //!< The number of entries left to handle until the method is finished
u32 address; //!< The method address in the GPU block specified by `subchannel` that is the target of the command
u8 subChannel;
/**
* @brief This is a simplified version of the full method type enum
*/
enum class State : u8 {
NonInc,
Inc,
OneInc //!< Will be switched to NonInc after the first call
} state; //!< The type of method to resume
} resumeState{};
/**
* @brief Sends a method call to the GPU hardware
*/
void Send(u32 method, u32 argument, u32 subchannel, bool lastCall);
/**
* @brief Processes the pushbuffer contained within the given GpEntry, calling methods as needed
*/
@ -118,7 +140,7 @@ namespace skyline::soc::gm20b {
void Run();
/**
* @brief Pushes a list of entries to the FIFO, these commands will be executed on calls to 'Step'
* @brief Pushes a list of entries to the FIFO, these commands will be executed on calls to 'Process'
*/
void Push(span<GpEntry> entries);