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186 lines
6.2 KiB
C++
186 lines
6.2 KiB
C++
// Copyright 2018 yuzu emulator team
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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 "common/alignment.h"
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "video_core/memory_manager.h"
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namespace Tegra {
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MemoryManager::MemoryManager() {
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// Mark the first page as reserved, so that 0 is not a valid GPUVAddr. Otherwise, games might
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// try to use 0 as a valid address, which is also used to mean nullptr. This fixes a bug with
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// Undertale using 0 for a render target.
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PageSlot(0) = static_cast<u64>(PageStatus::Reserved);
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}
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GPUVAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
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const std::optional<GPUVAddr> gpu_addr{FindFreeBlock(0, size, align, PageStatus::Unmapped)};
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ASSERT_MSG(gpu_addr, "unable to find available GPU memory");
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for (u64 offset{}; offset < size; offset += PAGE_SIZE) {
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VAddr& slot{PageSlot(*gpu_addr + offset)};
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ASSERT(slot == static_cast<u64>(PageStatus::Unmapped));
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slot = static_cast<u64>(PageStatus::Allocated);
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}
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return *gpu_addr;
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}
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GPUVAddr MemoryManager::AllocateSpace(GPUVAddr gpu_addr, u64 size, u64 align) {
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for (u64 offset{}; offset < size; offset += PAGE_SIZE) {
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VAddr& slot{PageSlot(gpu_addr + offset)};
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ASSERT(slot == static_cast<u64>(PageStatus::Unmapped));
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slot = static_cast<u64>(PageStatus::Allocated);
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}
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return gpu_addr;
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}
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GPUVAddr MemoryManager::MapBufferEx(VAddr cpu_addr, u64 size) {
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const std::optional<GPUVAddr> gpu_addr{FindFreeBlock(0, size, PAGE_SIZE, PageStatus::Unmapped)};
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ASSERT_MSG(gpu_addr, "unable to find available GPU memory");
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for (u64 offset{}; offset < size; offset += PAGE_SIZE) {
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VAddr& slot{PageSlot(*gpu_addr + offset)};
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ASSERT(slot == static_cast<u64>(PageStatus::Unmapped));
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slot = cpu_addr + offset;
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}
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const MappedRegion region{cpu_addr, *gpu_addr, size};
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mapped_regions.push_back(region);
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return *gpu_addr;
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}
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GPUVAddr MemoryManager::MapBufferEx(VAddr cpu_addr, GPUVAddr gpu_addr, u64 size) {
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ASSERT((gpu_addr & PAGE_MASK) == 0);
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if (PageSlot(gpu_addr) != static_cast<u64>(PageStatus::Allocated)) {
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// Page has been already mapped. In this case, we must find a new area of memory to use that
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// is different than the specified one. Super Mario Odyssey hits this scenario when changing
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// areas, but we do not want to overwrite the old pages.
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// TODO(bunnei): We need to write a hardware test to confirm this behavior.
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LOG_ERROR(HW_GPU, "attempting to map addr 0x{:016X}, which is not available!", gpu_addr);
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const std::optional<GPUVAddr> new_gpu_addr{
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FindFreeBlock(gpu_addr, size, PAGE_SIZE, PageStatus::Allocated)};
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ASSERT_MSG(new_gpu_addr, "unable to find available GPU memory");
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gpu_addr = *new_gpu_addr;
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}
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for (u64 offset{}; offset < size; offset += PAGE_SIZE) {
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VAddr& slot{PageSlot(gpu_addr + offset)};
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ASSERT(slot == static_cast<u64>(PageStatus::Allocated));
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slot = cpu_addr + offset;
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}
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const MappedRegion region{cpu_addr, gpu_addr, size};
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mapped_regions.push_back(region);
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return gpu_addr;
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}
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GPUVAddr MemoryManager::UnmapBuffer(GPUVAddr gpu_addr, u64 size) {
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ASSERT((gpu_addr & PAGE_MASK) == 0);
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for (u64 offset{}; offset < size; offset += PAGE_SIZE) {
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VAddr& slot{PageSlot(gpu_addr + offset)};
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ASSERT(slot != static_cast<u64>(PageStatus::Allocated) &&
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slot != static_cast<u64>(PageStatus::Unmapped));
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slot = static_cast<u64>(PageStatus::Unmapped);
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}
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// Delete the region mappings that are contained within the unmapped region
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mapped_regions.erase(std::remove_if(mapped_regions.begin(), mapped_regions.end(),
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[&](const MappedRegion& region) {
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return region.gpu_addr <= gpu_addr &&
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region.gpu_addr + region.size < gpu_addr + size;
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}),
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mapped_regions.end());
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return gpu_addr;
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}
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GPUVAddr MemoryManager::GetRegionEnd(GPUVAddr region_start) const {
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for (const auto& region : mapped_regions) {
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const GPUVAddr region_end{region.gpu_addr + region.size};
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if (region_start >= region.gpu_addr && region_start < region_end) {
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return region_end;
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}
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}
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return {};
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}
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std::optional<GPUVAddr> MemoryManager::FindFreeBlock(GPUVAddr region_start, u64 size, u64 align,
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PageStatus status) {
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GPUVAddr gpu_addr{region_start};
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u64 free_space{};
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align = (align + PAGE_MASK) & ~PAGE_MASK;
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while (gpu_addr + free_space < MAX_ADDRESS) {
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if (PageSlot(gpu_addr + free_space) == static_cast<u64>(status)) {
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free_space += PAGE_SIZE;
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if (free_space >= size) {
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return gpu_addr;
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}
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} else {
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gpu_addr += free_space + PAGE_SIZE;
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free_space = 0;
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gpu_addr = Common::AlignUp(gpu_addr, align);
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}
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}
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return {};
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}
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std::optional<VAddr> MemoryManager::GpuToCpuAddress(GPUVAddr gpu_addr) {
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const VAddr base_addr{PageSlot(gpu_addr)};
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if (base_addr == static_cast<u64>(PageStatus::Allocated) ||
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base_addr == static_cast<u64>(PageStatus::Unmapped) ||
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base_addr == static_cast<u64>(PageStatus::Reserved)) {
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return {};
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}
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return base_addr + (gpu_addr & PAGE_MASK);
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}
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std::vector<GPUVAddr> MemoryManager::CpuToGpuAddress(VAddr cpu_addr) const {
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std::vector<GPUVAddr> results;
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for (const auto& region : mapped_regions) {
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if (cpu_addr >= region.cpu_addr && cpu_addr < (region.cpu_addr + region.size)) {
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const u64 offset{cpu_addr - region.cpu_addr};
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results.push_back(region.gpu_addr + offset);
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}
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}
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return results;
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}
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VAddr& MemoryManager::PageSlot(GPUVAddr gpu_addr) {
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auto& block{page_table[(gpu_addr >> (PAGE_BITS + PAGE_TABLE_BITS)) & PAGE_TABLE_MASK]};
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if (!block) {
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block = std::make_unique<PageBlock>();
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block->fill(static_cast<VAddr>(PageStatus::Unmapped));
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}
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return (*block)[(gpu_addr >> PAGE_BITS) & PAGE_BLOCK_MASK];
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}
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} // namespace Tegra
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