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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/settings.h"
#include "core/core.h"
#include "video_core/dma_pusher.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/gpu.h"
#include "video_core/guest_memory.h"
#include "video_core/memory_manager.h"
#include "video_core/rasterizer_interface.h"
namespace Tegra {
constexpr u32 MacroRegistersStart = 0xE00;
[[maybe_unused]] constexpr u32 ComputeInline = 0x6D;
DmaPusher::DmaPusher(Core::System& system_, MemoryManager& memory_manager_, Control::ChannelState& channel_state_)
: system{system_}
, memory_manager{memory_manager_}
, channel_state{channel_state_}
, signal_sync{false}
, synced{false}
{}
DmaPusher::~DmaPusher() = default;
void DmaPusher::DispatchCalls() {
dma_pushbuffer_subindex = 0;
dma_state.is_last_call = true;
while (system.IsPoweredOn()) {
if (!Step()) {
break;
}
}
system.GPU().FlushCommands();
system.GPU().OnCommandListEnd();
}
bool DmaPusher::Step() {
if (!ib_enable || dma_pushbuffer.empty()) {
return false;
}
CommandList& command_list = dma_pushbuffer.front();
const size_t prefetch_size = command_list.prefetch_command_list.size();
const size_t command_list_size = command_list.command_lists.size();
if (prefetch_size == 0 && command_list_size == 0) {
dma_pushbuffer.pop();
dma_pushbuffer_subindex = 0;
return true;
}
if (prefetch_size > 0) {
ProcessCommands(command_list.prefetch_command_list);
dma_pushbuffer.pop();
return true;
}
auto& current_command = command_list.command_lists[dma_pushbuffer_subindex];
const CommandListHeader& header = current_command;
dma_state.dma_get = header.addr;
if (signal_sync && !synced) {
std::unique_lock lk(sync_mutex);
sync_cv.wait(lk, [this]() { return synced; });
signal_sync = false;
synced = false;
}
if (header.size > 0 && dma_state.method >= MacroRegistersStart && subchannels[dma_state.subchannel]) {
subchannels[dma_state.subchannel]->current_dirty = memory_manager.IsMemoryDirty(dma_state.dma_get, header.size * sizeof(u32));
}
if (header.size > 0) {
const bool use_safe = Settings::IsDMALevelDefault() ? Settings::IsGPULevelHigh() : Settings::IsDMALevelSafe();
if (use_safe) {
Tegra::Memory::GpuGuestMemory<Tegra::CommandHeader, Tegra::Memory::GuestMemoryFlags::SafeRead>headers(memory_manager, dma_state.dma_get, header.size, &command_headers);
ProcessCommands(headers);
} else {
Tegra::Memory::GpuGuestMemory<Tegra::CommandHeader, Tegra::Memory::GuestMemoryFlags::UnsafeRead>headers(memory_manager, dma_state.dma_get, header.size, &command_headers);
ProcessCommands(headers);
}
}
if (++dma_pushbuffer_subindex >= command_list_size) {
dma_pushbuffer.pop();
dma_pushbuffer_subindex = 0;
} else {
signal_sync = command_list.command_lists[dma_pushbuffer_subindex].sync && Settings::values.sync_memory_operations.GetValue();
}
if (signal_sync) {
rasterizer->SignalFence([this]() {
std::scoped_lock lk(sync_mutex);
synced = true;
sync_cv.notify_all();
});
}
return true;
}
void DmaPusher::ProcessCommands(std::span<const CommandHeader> commands) {
for (size_t index = 0; index < commands.size();) {
// Data word of methods command
if (dma_state.method_count && dma_state.non_incrementing) {
auto const& command_header = commands[index]; //must ref (MUltiMethod re)
dma_state.dma_word_offset = u32(index * sizeof(u32));
const u32 max_write = u32(std::min<std::size_t>(index + dma_state.method_count, commands.size()) - index);
CallMultiMethod(&command_header.argument, max_write);
dma_state.method_count -= max_write;
dma_state.is_last_call = true;
index += max_write;
} else if (dma_state.method_count) {
auto const command_header = commands[index]; //can copy
dma_state.dma_word_offset = u32(index * sizeof(u32));
dma_state.is_last_call = dma_state.method_count <= 1;
CallMethod(command_header.argument);
dma_state.method += !dma_state.non_incrementing ? 1 : 0;
dma_state.non_incrementing |= dma_increment_once;
dma_state.method_count--;
index++;
} else {
auto const command_header = commands[index]; //can copy
// No command active - this is the first word of a new one
switch (command_header.mode) {
case SubmissionMode::Increasing:
SetState(command_header);
dma_state.non_incrementing = false;
dma_increment_once = false;
break;
case SubmissionMode::NonIncreasing:
SetState(command_header);
dma_state.non_incrementing = true;
dma_increment_once = false;
break;
case SubmissionMode::Inline:
dma_state.method = command_header.method;
dma_state.subchannel = command_header.subchannel;
dma_state.dma_word_offset = u64(-s64(dma_state.dma_get)); // negate to set address as 0
CallMethod(command_header.arg_count);
dma_state.non_incrementing = true;
dma_increment_once = false;
break;
case SubmissionMode::IncreaseOnce:
SetState(command_header);
dma_state.non_incrementing = false;
dma_increment_once = true;
break;
default:
break;
}
index++;
}
}
}
void DmaPusher::SetState(const CommandHeader& command_header) {
dma_state.method = command_header.method;
dma_state.subchannel = command_header.subchannel;
dma_state.method_count = command_header.method_count;
}
void DmaPusher::CallMethod(u32 argument) {
if (dma_state.method < non_puller_methods) {
puller.CallPullerMethod(*this, Engines::Puller::MethodCall{
dma_state.method,
argument,
dma_state.subchannel,
dma_state.method_count,
});
} else {
auto subchannel = subchannels[dma_state.subchannel];
if (!subchannel->execution_mask[dma_state.method]) {
subchannel->method_sink.emplace_back(dma_state.method, argument);
} else {
subchannel->ConsumeSink(system);
subchannel->current_dma_segment = dma_state.dma_get + dma_state.dma_word_offset;
subchannel->CallMethod(system, dma_state.method, argument, dma_state.is_last_call);
}
}
}
void DmaPusher::CallMultiMethod(const u32* base_start, u32 num_methods) {
if (dma_state.method < non_puller_methods) {
puller.CallMultiMethod(*this, dma_state.method, dma_state.subchannel, base_start, num_methods, dma_state.method_count);
} else {
auto subchannel = subchannels[dma_state.subchannel];
subchannel->ConsumeSink(system);
subchannel->current_dma_segment = dma_state.dma_get + dma_state.dma_word_offset;
subchannel->CallMultiMethod(system, dma_state.method, base_start, num_methods, dma_state.method_count);
}
}
void DmaPusher::BindRasterizer(VideoCore::RasterizerInterface* rasterizer_) {
rasterizer = rasterizer_;
}
} // namespace Tegra
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