buffer_cache/buffer_base: Add a range tracking buffer container
It keeps track of the modified CPU and GPU ranges on a CPU page granularity, notifying the given rasterizer about state changes in the tracking behavior of the buffer. Use a small vector optimization to store buffers smaller than 256 KiB locally instead of using free store memory allocations.
This commit is contained in:
ReinUsesLisp
parent
99d2d77062
commit
a4bfae1b55
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@ -1,6 +1,7 @@
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add_subdirectory(host_shaders)
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add_library(video_core STATIC
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buffer_cache/buffer_base.h
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buffer_cache/buffer_block.h
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buffer_cache/buffer_cache.h
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buffer_cache/map_interval.cpp
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@ -0,0 +1,495 @@
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <algorithm>
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#include <bit>
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#include <limits>
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#include <utility>
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#include "common/alignment.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "common/div_ceil.h"
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#include "core/memory.h"
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namespace VideoCommon {
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enum class BufferFlagBits {
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Picked = 1 << 0,
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};
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DECLARE_ENUM_FLAG_OPERATORS(BufferFlagBits)
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/// Tag for creating null buffers with no storage or size
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struct NullBufferParams {};
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/**
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* Range tracking buffer container.
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*
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* It keeps track of the modified CPU and GPU ranges on a CPU page granularity, notifying the given
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* rasterizer about state changes in the tracking behavior of the buffer.
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*
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* The buffer size and address is forcefully aligned to CPU page boundaries.
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*/
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template <class RasterizerInterface>
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class BufferBase {
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static constexpr u64 PAGES_PER_WORD = 64;
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static constexpr u64 BYTES_PER_PAGE = Core::Memory::PAGE_SIZE;
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static constexpr u64 BYTES_PER_WORD = PAGES_PER_WORD * BYTES_PER_PAGE;
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/// Vector tracking modified pages tightly packed with small vector optimization
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union WrittenWords {
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/// Returns the pointer to the words state
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[[nodiscard]] const u64* Pointer(bool is_short) const noexcept {
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return is_short ? &stack : heap;
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}
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/// Returns the pointer to the words state
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[[nodiscard]] u64* Pointer(bool is_short) noexcept {
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return is_short ? &stack : heap;
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}
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u64 stack = 0; ///< Small buffers storage
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u64* heap; ///< Not-small buffers pointer to the storage
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};
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struct GpuCpuWords {
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explicit GpuCpuWords() = default;
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explicit GpuCpuWords(u64 size_bytes_) : size_bytes{size_bytes_} {
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if (IsShort()) {
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cpu.stack = ~u64{0};
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gpu.stack = 0;
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} else {
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// Share allocation between CPU and GPU pages and set their default values
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const size_t num_words = NumWords();
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u64* const alloc = new u64[num_words * 2];
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cpu.heap = alloc;
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gpu.heap = alloc + num_words;
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std::fill_n(cpu.heap, num_words, ~u64{0});
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std::fill_n(gpu.heap, num_words, 0);
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}
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// Clean up tailing bits
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const u64 last_local_page =
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Common::DivCeil(size_bytes % BYTES_PER_WORD, BYTES_PER_PAGE);
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const u64 shift = (PAGES_PER_WORD - last_local_page) % PAGES_PER_WORD;
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u64& last_word = cpu.Pointer(IsShort())[NumWords() - 1];
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last_word = (last_word << shift) >> shift;
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}
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~GpuCpuWords() {
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Release();
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}
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GpuCpuWords& operator=(GpuCpuWords&& rhs) noexcept {
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Release();
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size_bytes = rhs.size_bytes;
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cpu = rhs.cpu;
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gpu = rhs.gpu;
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rhs.cpu.heap = nullptr;
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return *this;
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}
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GpuCpuWords(GpuCpuWords&& rhs) noexcept
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: size_bytes{rhs.size_bytes}, cpu{rhs.cpu}, gpu{rhs.gpu} {
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rhs.cpu.heap = nullptr;
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}
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GpuCpuWords& operator=(const GpuCpuWords&) = delete;
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GpuCpuWords(const GpuCpuWords&) = delete;
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/// Returns true when the buffer fits in the small vector optimization
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[[nodiscard]] bool IsShort() const noexcept {
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return size_bytes <= BYTES_PER_WORD;
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}
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/// Returns the number of words of the buffer
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[[nodiscard]] size_t NumWords() const noexcept {
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return Common::DivCeil(size_bytes, BYTES_PER_WORD);
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}
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/// Release buffer resources
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void Release() {
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if (!IsShort()) {
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// CPU written words is the base for the heap allocation
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delete[] cpu.heap;
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}
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}
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u64 size_bytes = 0;
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WrittenWords cpu;
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WrittenWords gpu;
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};
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public:
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explicit BufferBase(RasterizerInterface& rasterizer_, VAddr cpu_addr_, u64 size_bytes)
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: rasterizer{&rasterizer_}, cpu_addr{Common::AlignDown(cpu_addr_, BYTES_PER_PAGE)},
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words(Common::AlignUp(size_bytes + (cpu_addr_ - cpu_addr), BYTES_PER_PAGE)) {}
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explicit BufferBase(NullBufferParams) {}
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BufferBase& operator=(const BufferBase&) = delete;
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BufferBase(const BufferBase&) = delete;
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/// Returns the inclusive CPU modified range in a begin end pair
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[[nodiscard]] std::pair<u64, u64> ModifiedCpuRegion(VAddr query_cpu_addr,
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u64 query_size) const noexcept {
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const u64 offset = query_cpu_addr - cpu_addr;
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return ModifiedRegion<false>(offset, query_size);
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}
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/// Returns the inclusive GPU modified range in a begin end pair
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[[nodiscard]] std::pair<u64, u64> ModifiedGpuRegion(VAddr query_cpu_addr,
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u64 query_size) const noexcept {
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const u64 offset = query_cpu_addr - cpu_addr;
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return ModifiedRegion<true>(offset, query_size);
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}
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/// Returns true if a region has been modified from the CPU
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[[nodiscard]] bool IsRegionCpuModified(VAddr query_cpu_addr, u64 query_size) const noexcept {
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const u64 offset = query_cpu_addr - cpu_addr;
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return IsRegionModified<false>(offset, query_size);
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}
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/// Returns true if a region has been modified from the GPU
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[[nodiscard]] bool IsRegionGpuModified(VAddr query_cpu_addr, u64 query_size) const noexcept {
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const u64 offset = query_cpu_addr - cpu_addr;
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return IsRegionModified<true>(offset, query_size);
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}
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/// Mark region as CPU modified, notifying the rasterizer about this change
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void MarkRegionAsCpuModified(VAddr dirty_cpu_addr, u64 size) {
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ChangeRegionState<true, true>(words.cpu, dirty_cpu_addr, size);
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}
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/// Unmark region as CPU modified, notifying the rasterizer about this change
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void UnmarkRegionAsCpuModified(VAddr dirty_cpu_addr, u64 size) {
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ChangeRegionState<false, true>(words.cpu, dirty_cpu_addr, size);
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}
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/// Mark region as modified from the host GPU
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void MarkRegionAsGpuModified(VAddr dirty_cpu_addr, u64 size) noexcept {
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ChangeRegionState<true, false>(words.gpu, dirty_cpu_addr, size);
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}
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/// Unmark region as modified from the host GPU
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void UnmarkRegionAsGpuModified(VAddr dirty_cpu_addr, u64 size) noexcept {
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ChangeRegionState<false, false>(words.gpu, dirty_cpu_addr, size);
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}
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/// Call 'func' for each CPU modified range and unmark those pages as CPU modified
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template <typename Func>
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void ForEachUploadRange(VAddr query_cpu_range, u64 size, Func&& func) {
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ForEachModifiedRange<false, true>(query_cpu_range, size, func);
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}
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/// Call 'func' for each GPU modified range and unmark those pages as GPU modified
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template <typename Func>
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void ForEachDownloadRange(VAddr query_cpu_range, u64 size, Func&& func) {
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ForEachModifiedRange<true, false>(query_cpu_range, size, func);
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}
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/// Call 'func' for each GPU modified range and unmark those pages as GPU modified
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template <typename Func>
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void ForEachDownloadRange(Func&& func) {
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ForEachModifiedRange<true, false>(cpu_addr, SizeBytes(), func);
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}
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/// Mark buffer as picked
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void Pick() noexcept {
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flags |= BufferFlagBits::Picked;
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}
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/// Unmark buffer as picked
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void Unpick() noexcept {
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flags &= ~BufferFlagBits::Picked;
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}
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/// Returns true when vaddr -> vaddr+size is fully contained in the buffer
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[[nodiscard]] bool IsInBounds(VAddr addr, u64 size) const noexcept {
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return addr >= cpu_addr && addr + size <= cpu_addr + SizeBytes();
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}
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/// Returns true if the buffer has been marked as picked
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[[nodiscard]] bool IsPicked() const noexcept {
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return True(flags & BufferFlagBits::Picked);
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}
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/// Returns the base CPU address of the buffer
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[[nodiscard]] VAddr CpuAddr() const noexcept {
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return cpu_addr;
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}
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/// Returns the offset relative to the given CPU address
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/// @pre IsInBounds returns true
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[[nodiscard]] u32 Offset(VAddr other_cpu_addr) const noexcept {
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return static_cast<u32>(other_cpu_addr - cpu_addr);
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}
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/// Returns the size in bytes of the buffer
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[[nodiscard]] u64 SizeBytes() const noexcept {
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return words.size_bytes;
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}
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private:
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/**
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* Change the state of a range of pages
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*
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* @param written_words Pages to be marked or unmarked as modified
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* @param dirty_addr Base address to mark or unmark as modified
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* @param size Size in bytes to mark or unmark as modified
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*
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* @tparam enable True when the bits will be set to one, false for zero
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* @tparam notify_rasterizer True when the rasterizer has to be notified about the changes
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*/
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template <bool enable, bool notify_rasterizer>
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void ChangeRegionState(WrittenWords& written_words, u64 dirty_addr,
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s64 size) noexcept(!notify_rasterizer) {
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const s64 difference = dirty_addr - cpu_addr;
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const u64 offset = std::max<s64>(difference, 0);
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size += std::min<s64>(difference, 0);
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if (offset >= SizeBytes() || size < 0) {
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return;
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}
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u64* const state_words = written_words.Pointer(IsShort());
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const u64 offset_end = std::min(offset + size, SizeBytes());
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const u64 begin_page_index = offset / BYTES_PER_PAGE;
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const u64 begin_word_index = begin_page_index / PAGES_PER_WORD;
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const u64 end_page_index = Common::DivCeil(offset_end, BYTES_PER_PAGE);
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const u64 end_word_index = Common::DivCeil(end_page_index, PAGES_PER_WORD);
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u64 page_index = begin_page_index % PAGES_PER_WORD;
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u64 word_index = begin_word_index;
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while (word_index < end_word_index) {
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const u64 next_word_first_page = (word_index + 1) * PAGES_PER_WORD;
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const u64 left_offset =
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std::min(next_word_first_page - end_page_index, PAGES_PER_WORD) % PAGES_PER_WORD;
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const u64 right_offset = page_index;
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u64 bits = ~u64{0};
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bits = (bits >> right_offset) << right_offset;
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bits = (bits << left_offset) >> left_offset;
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if constexpr (notify_rasterizer) {
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NotifyRasterizer<!enable>(word_index, state_words[word_index], bits);
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}
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if constexpr (enable) {
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state_words[word_index] |= bits;
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} else {
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state_words[word_index] &= ~bits;
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}
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page_index = 0;
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++word_index;
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}
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}
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/**
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* Notify rasterizer about changes in the CPU tracking state of a word in the buffer
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*
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* @param word_index Index to the word to notify to the rasterizer
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* @param current_bits Current state of the word
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* @param new_bits New state of the word
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*
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* @tparam add_to_rasterizer True when the rasterizer should start tracking the new pages
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*/
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template <bool add_to_rasterizer>
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void NotifyRasterizer(u64 word_index, u64 current_bits, u64 new_bits) {
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u64 changed_bits = (add_to_rasterizer ? current_bits : ~current_bits) & new_bits;
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VAddr addr = cpu_addr + word_index * BYTES_PER_WORD;
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while (changed_bits != 0) {
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const int empty_bits = std::countr_zero(changed_bits);
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addr += empty_bits * BYTES_PER_PAGE;
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changed_bits >>= empty_bits;
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const u32 continuous_bits = std::countr_one(changed_bits);
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const u64 size = continuous_bits * BYTES_PER_PAGE;
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const VAddr begin_addr = addr;
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addr += size;
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changed_bits = continuous_bits < PAGES_PER_WORD ? (changed_bits >> continuous_bits) : 0;
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rasterizer->UpdatePagesCachedCount(begin_addr, size, add_to_rasterizer ? 1 : -1);
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}
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}
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/**
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* Loop over each page in the given range, turn off those bits and notify the rasterizer if
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* needed. Call the given function on each turned off range.
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*
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* @param query_cpu_range Base CPU address to loop over
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* @param size Size in bytes of the CPU range to loop over
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* @param func Function to call for each turned off region
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*
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* @tparam gpu True for host GPU pages, false for CPU pages
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* @tparam notify_rasterizer True when the rasterizer should be notified about state changes
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*/
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template <bool gpu, bool notify_rasterizer, typename Func>
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void ForEachModifiedRange(VAddr query_cpu_range, s64 size, Func&& func) {
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const s64 difference = query_cpu_range - cpu_addr;
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const u64 query_begin = std::max<s64>(difference, 0);
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size += std::min<s64>(difference, 0);
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if (query_begin >= SizeBytes() || size < 0) {
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return;
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}
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const u64* const cpu_words = words.cpu.Pointer(IsShort());
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const u64 query_end = query_begin + std::min(static_cast<u64>(size), SizeBytes());
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u64* const state_words = (gpu ? words.gpu : words.cpu).Pointer(IsShort());
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u64* const words_begin = state_words + query_begin / BYTES_PER_WORD;
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u64* const words_end = state_words + Common::DivCeil(query_end, BYTES_PER_WORD);
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const auto modified = [](u64 word) { return word != 0; };
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const auto first_modified_word = std::find_if(words_begin, words_end, modified);
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if (first_modified_word == words_end) {
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// Exit early when the buffer is not modified
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return;
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}
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const auto last_modified_word = std::find_if_not(first_modified_word, words_end, modified);
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const u64 word_index_begin = std::distance(state_words, first_modified_word);
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const u64 word_index_end = std::distance(state_words, last_modified_word);
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const unsigned local_page_begin = std::countr_zero(*first_modified_word);
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const unsigned local_page_end = PAGES_PER_WORD - std::countl_zero(last_modified_word[-1]);
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const u64 word_page_begin = word_index_begin * PAGES_PER_WORD;
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const u64 word_page_end = (word_index_end - 1) * PAGES_PER_WORD;
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const u64 query_page_begin = query_begin / BYTES_PER_PAGE;
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const u64 query_page_end = Common::DivCeil(query_end, BYTES_PER_PAGE);
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const u64 page_index_begin = std::max(word_page_begin + local_page_begin, query_page_begin);
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const u64 page_index_end = std::min(word_page_end + local_page_end, query_page_end);
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const u64 first_word_page_begin = page_index_begin % PAGES_PER_WORD;
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const u64 last_word_page_end = (page_index_end - 1) % PAGES_PER_WORD + 1;
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u64 page_begin = first_word_page_begin;
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u64 current_base = 0;
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u64 current_size = 0;
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bool on_going = false;
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for (u64 word_index = word_index_begin; word_index < word_index_end; ++word_index) {
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const bool is_last_word = word_index + 1 == word_index_end;
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const u64 page_end = is_last_word ? last_word_page_end : PAGES_PER_WORD;
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const u64 right_offset = page_begin;
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const u64 left_offset = PAGES_PER_WORD - page_end;
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u64 bits = ~u64{0};
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bits = (bits >> right_offset) << right_offset;
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bits = (bits << left_offset) >> left_offset;
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const u64 current_word = state_words[word_index] & bits;
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state_words[word_index] &= ~bits;
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// Exclude CPU modified pages when visiting GPU pages
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const u64 word = current_word & ~(gpu ? cpu_words[word_index] : 0);
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if constexpr (notify_rasterizer) {
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NotifyRasterizer<true>(word_index, word, ~u64{0});
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}
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u64 page = page_begin;
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page_begin = 0;
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while (page < page_end) {
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const int empty_bits = std::countr_zero(word >> page);
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if (on_going && empty_bits != 0) {
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InvokeModifiedRange(func, current_size, current_base);
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current_size = 0;
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on_going = false;
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}
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page += empty_bits;
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const int continuous_bits = std::countr_one(word >> page);
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if (!on_going && continuous_bits != 0) {
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current_base = word_index * PAGES_PER_WORD + page;
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on_going = true;
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}
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current_size += continuous_bits;
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page += continuous_bits;
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}
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}
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if (on_going && current_size > 0) {
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InvokeModifiedRange(func, current_size, current_base);
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}
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}
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template <typename Func>
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void InvokeModifiedRange(Func&& func, u64 current_size, u64 current_base) {
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const u64 current_size_bytes = current_size * BYTES_PER_PAGE;
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const u64 offset_begin = current_base * BYTES_PER_PAGE;
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const u64 offset_end = std::min(offset_begin + current_size_bytes, SizeBytes());
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func(offset_begin, offset_end - offset_begin);
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}
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/**
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* Returns true when a region has been modified
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*
|
||||
* @param offset Offset in bytes from the start of the buffer
|
||||
* @param size Size in bytes of the region to query for modifications
|
||||
*/
|
||||
template <bool gpu>
|
||||
[[nodiscard]] bool IsRegionModified(u64 offset, u64 size) const noexcept {
|
||||
const u64* const cpu_words = words.cpu.Pointer(IsShort());
|
||||
const u64* const state_words = (gpu ? words.gpu : words.cpu).Pointer(IsShort());
|
||||
const u64 num_query_words = size / BYTES_PER_WORD + 1;
|
||||
const u64 word_begin = offset / BYTES_PER_WORD;
|
||||
const u64 word_end = std::min(word_begin + num_query_words, NumWords());
|
||||
const u64 page_limit = Common::DivCeil(offset + size, BYTES_PER_PAGE);
|
||||
u64 page_index = (offset / BYTES_PER_PAGE) % PAGES_PER_WORD;
|
||||
for (u64 word_index = word_begin; word_index < word_end; ++word_index, page_index = 0) {
|
||||
const u64 word = state_words[word_index] & ~(gpu ? cpu_words[word_index] : 0);
|
||||
if (word == 0) {
|
||||
continue;
|
||||
}
|
||||
const u64 page_end = std::min((word_index + 1) * PAGES_PER_WORD, page_limit);
|
||||
const u64 local_page_end = page_end % PAGES_PER_WORD;
|
||||
const u64 page_end_shift = (PAGES_PER_WORD - local_page_end) % PAGES_PER_WORD;
|
||||
if (((word >> page_index) << page_index) << page_end_shift != 0) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a begin end pair with the inclusive modified region
|
||||
*
|
||||
* @param offset Offset in bytes from the start of the buffer
|
||||
* @param size Size in bytes of the region to query for modifications
|
||||
*
|
||||
* @tparam True to query GPU modified pages, false for CPU pages
|
||||
*/
|
||||
template <bool gpu>
|
||||
[[nodiscard]] std::pair<u64, u64> ModifiedRegion(u64 offset, u64 size) const noexcept {
|
||||
const u64* const cpu_words = words.cpu.Pointer(IsShort());
|
||||
const u64* const state_words = (gpu ? words.gpu : words.cpu).Pointer(IsShort());
|
||||
const u64 num_query_words = size / BYTES_PER_WORD + 1;
|
||||
const u64 word_begin = offset / BYTES_PER_WORD;
|
||||
const u64 word_end = std::min(word_begin + num_query_words, NumWords());
|
||||
const u64 page_base = offset / BYTES_PER_PAGE;
|
||||
const u64 page_limit = Common::DivCeil(offset + size, BYTES_PER_PAGE);
|
||||
u64 begin = std::numeric_limits<u64>::max();
|
||||
u64 end = 0;
|
||||
for (u64 word_index = word_begin; word_index < word_end; ++word_index) {
|
||||
const u64 word = state_words[word_index] & ~(gpu ? cpu_words[word_index] : 0);
|
||||
if (word == 0) {
|
||||
continue;
|
||||
}
|
||||
const u64 local_page_begin = std::countr_zero(word);
|
||||
const u64 local_page_end = PAGES_PER_WORD - std::countl_zero(word);
|
||||
const u64 page_index = word_index * PAGES_PER_WORD;
|
||||
const u64 page_begin = std::max(page_index + local_page_begin, page_base);
|
||||
const u64 page_end = std::min(page_index + local_page_end, page_limit);
|
||||
begin = std::min(begin, page_begin);
|
||||
end = std::max(end, page_end);
|
||||
}
|
||||
static constexpr std::pair<u64, u64> EMPTY{0, 0};
|
||||
return begin < end ? std::make_pair(begin * BYTES_PER_PAGE, end * BYTES_PER_PAGE) : EMPTY;
|
||||
}
|
||||
|
||||
/// Returns the number of words of the buffer
|
||||
[[nodiscard]] size_t NumWords() const noexcept {
|
||||
return words.NumWords();
|
||||
}
|
||||
|
||||
/// Returns true when the buffer fits in the small vector optimization
|
||||
[[nodiscard]] bool IsShort() const noexcept {
|
||||
return words.IsShort();
|
||||
}
|
||||
|
||||
RasterizerInterface* rasterizer = nullptr;
|
||||
VAddr cpu_addr = 0;
|
||||
GpuCpuWords words;
|
||||
BufferFlagBits flags{};
|
||||
};
|
||||
|
||||
} // namespace VideoCommon
|
||||
Reference in New Issue