72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
// Copyright 2019 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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#include <atomic>
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#include "common/assert.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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#include "video_core/rasterizer_accelerated.h"
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namespace VideoCore {
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using namespace Core::Memory;
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RasterizerAccelerated::RasterizerAccelerated(Memory& cpu_memory_) : cpu_memory{cpu_memory_} {}
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RasterizerAccelerated::~RasterizerAccelerated() = default;
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void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
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u64 uncache_begin = 0;
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u64 cache_begin = 0;
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u64 uncache_bytes = 0;
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u64 cache_bytes = 0;
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std::atomic_thread_fence(std::memory_order_acquire);
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const u64 page_end = Common::DivCeil(addr + size, PAGE_SIZE);
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for (u64 page = addr >> PAGE_BITS; page != page_end; ++page) {
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std::atomic_uint16_t& count = cached_pages.at(page >> 2).Count(page);
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if (delta > 0) {
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ASSERT_MSG(count.load(std::memory_order::relaxed) < UINT16_MAX, "Count may overflow!");
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} else if (delta < 0) {
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ASSERT_MSG(count.load(std::memory_order::relaxed) > 0, "Count may underflow!");
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} else {
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ASSERT_MSG(false, "Delta must be non-zero!");
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}
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// Adds or subtracts 1, as count is a unsigned 8-bit value
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count.fetch_add(static_cast<u16>(delta), std::memory_order_release);
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// Assume delta is either -1 or 1
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if (count.load(std::memory_order::relaxed) == 0) {
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if (uncache_bytes == 0) {
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uncache_begin = page;
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}
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uncache_bytes += PAGE_SIZE;
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} else if (uncache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(uncache_begin << PAGE_BITS, uncache_bytes, false);
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uncache_bytes = 0;
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}
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if (count.load(std::memory_order::relaxed) == 1 && delta > 0) {
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if (cache_bytes == 0) {
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cache_begin = page;
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}
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cache_bytes += PAGE_SIZE;
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} else if (cache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(cache_begin << PAGE_BITS, cache_bytes, true);
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cache_bytes = 0;
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}
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}
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if (uncache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(uncache_begin << PAGE_BITS, uncache_bytes, false);
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}
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if (cache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(cache_begin << PAGE_BITS, cache_bytes, true);
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}
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}
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} // namespace VideoCore
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