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video_core/dma_pusher: The full list of headers at once.

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Fetching every u32 from memory leads to a big overhead. So let's fetch all of them as a block if possible.
This reduces the Memory::* calls by the dma_pusher by a factor of 10.
This commit is contained in:
Markus Wick 2019-02-19 09:44:33 +01:00
parent 4bce08d497
commit 717394c980
2 changed files with 57 additions and 47 deletions
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102
src/video_core/dma_pusher.cpp
View file

@ -38,58 +38,66 @@ bool DmaPusher::Step() {
const auto address = gpu.MemoryManager().GpuToCpuAddress(dma_get);
ASSERT_MSG(address, "Invalid GPU address");
const CommandHeader command_header{Memory::Read32(*address)};
GPUVAddr size = dma_put - dma_get;
ASSERT_MSG(size % sizeof(CommandHeader) == 0, "Invalid aligned GPU addresses");
command_headers.resize(size / sizeof(CommandHeader));
dma_get += sizeof(u32);
Memory::ReadBlock(*address, command_headers.data(), size);
if (!non_main) {
dma_mget = dma_get;
for (const CommandHeader& command_header : command_headers) {
// now, see if we're in the middle of a command
if (dma_state.length_pending) {
// Second word of long non-inc methods command - method count
dma_state.length_pending = 0;
dma_state.method_count = command_header.method_count_;
} else if (dma_state.method_count) {
// Data word of methods command
CallMethod(command_header.argument);
if (!dma_state.non_incrementing) {
dma_state.method++;
}
if (dma_increment_once) {
dma_state.non_incrementing = true;
}
dma_state.method_count--;
} else {
// 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;
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;
}
}
}
// now, see if we're in the middle of a command
if (dma_state.length_pending) {
// Second word of long non-inc methods command - method count
dma_state.length_pending = 0;
dma_state.method_count = command_header.method_count_;
} else if (dma_state.method_count) {
// Data word of methods command
CallMethod(command_header.argument);
dma_get = dma_put;
if (!dma_state.non_incrementing) {
dma_state.method++;
}
if (dma_increment_once) {
dma_state.non_incrementing = true;
}
dma_state.method_count--;
} else {
// 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;
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;
}
if (!non_main) {
// TODO (degasus): This is dead code, as dma_mget is never read.
dma_mget = dma_get;
}
} else if (ib_enable && !dma_pushbuffer.empty()) {
// Current pushbuffer empty, but we have more IB entries to read

2
src/video_core/dma_pusher.h
View file

@ -75,6 +75,8 @@ private:
GPU& gpu;
std::vector<CommandHeader> command_headers; ///< Buffer for list of commands fetched at once
std::queue<CommandList> dma_pushbuffer; ///< Queue of command lists to be processed
std::size_t dma_pushbuffer_subindex{}; ///< Index within a command list within the pushbuffer