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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/alignment.h"
#include "common/assert.h"
#include "video_core/memory_manager.h"
namespace Tegra {
GPUVAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
boost::optional<GPUVAddr> gpu_addr = FindFreeBlock(size, align);
ASSERT(gpu_addr);
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(*gpu_addr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(*gpu_addr + offset) = static_cast<u64>(PageStatus::Allocated);
}
return *gpu_addr;
}
GPUVAddr MemoryManager::AllocateSpace(GPUVAddr gpu_addr, u64 size, u64 align) {
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(gpu_addr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(gpu_addr + offset) = static_cast<u64>(PageStatus::Allocated);
}
return gpu_addr;
}
GPUVAddr MemoryManager::MapBufferEx(VAddr cpu_addr, u64 size) {
boost::optional<GPUVAddr> gpu_addr = FindFreeBlock(size, PAGE_SIZE);
ASSERT(gpu_addr);
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(*gpu_addr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(*gpu_addr + offset) = cpu_addr + offset;
}
MappedRegion region{cpu_addr, *gpu_addr, size};
mapped_regions.push_back(region);
return *gpu_addr;
}
GPUVAddr MemoryManager::MapBufferEx(VAddr cpu_addr, GPUVAddr gpu_addr, u64 size) {
ASSERT((gpu_addr & PAGE_MASK) == 0);
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(gpu_addr + offset) == static_cast<u64>(PageStatus::Allocated));
PageSlot(gpu_addr + offset) = cpu_addr + offset;
}
MappedRegion region{cpu_addr, gpu_addr, size};
mapped_regions.push_back(region);
return gpu_addr;
}
GPUVAddr MemoryManager::UnmapBuffer(GPUVAddr gpu_addr, u64 size) {
ASSERT((gpu_addr & PAGE_MASK) == 0);
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(gpu_addr + offset) != static_cast<u64>(PageStatus::Allocated) &&
PageSlot(gpu_addr + offset) != static_cast<u64>(PageStatus::Unmapped));
PageSlot(gpu_addr + offset) = static_cast<u64>(PageStatus::Unmapped);
}
// Delete the region mappings that are contained within the unmapped region
mapped_regions.erase(std::remove_if(mapped_regions.begin(), mapped_regions.end(),
[&](const MappedRegion& region) {
return region.gpu_addr <= gpu_addr &&
region.gpu_addr + region.size < gpu_addr + size;
}),
mapped_regions.end());
return gpu_addr;
}
boost::optional<GPUVAddr> MemoryManager::FindFreeBlock(u64 size, u64 align) {
GPUVAddr gpu_addr = 0;
u64 free_space = 0;
align = (align + PAGE_MASK) & ~PAGE_MASK;
while (gpu_addr + free_space < MAX_ADDRESS) {
if (!IsPageMapped(gpu_addr + free_space)) {
free_space += PAGE_SIZE;
if (free_space >= size) {
return gpu_addr;
}
} else {
gpu_addr += free_space + PAGE_SIZE;
free_space = 0;
gpu_addr = Common::AlignUp(gpu_addr, align);
}
}
return {};
}
boost::optional<VAddr> MemoryManager::GpuToCpuAddress(GPUVAddr gpu_addr) {
VAddr base_addr = PageSlot(gpu_addr);
ASSERT(base_addr != static_cast<u64>(PageStatus::Unmapped));
if (base_addr == static_cast<u64>(PageStatus::Allocated)) {
return {};
}
return base_addr + (gpu_addr & PAGE_MASK);
}
std::vector<GPUVAddr> MemoryManager::CpuToGpuAddress(VAddr cpu_addr) const {
std::vector<GPUVAddr> results;
for (const auto& region : mapped_regions) {
if (cpu_addr >= region.cpu_addr && cpu_addr < (region.cpu_addr + region.size)) {
u64 offset = cpu_addr - region.cpu_addr;
results.push_back(region.gpu_addr + offset);
}
}
return results;
}
bool MemoryManager::IsPageMapped(GPUVAddr gpu_addr) {
return PageSlot(gpu_addr) != static_cast<u64>(PageStatus::Unmapped);
}
VAddr& MemoryManager::PageSlot(GPUVAddr gpu_addr) {
auto& block = page_table[(gpu_addr >> (PAGE_BITS + PAGE_TABLE_BITS)) & PAGE_TABLE_MASK];
if (!block) {
block = std::make_unique<PageBlock>();
for (unsigned index = 0; index < PAGE_BLOCK_SIZE; index++) {
(*block)[index] = static_cast<u64>(PageStatus::Unmapped);
}
}
return (*block)[(gpu_addr >> PAGE_BITS) & PAGE_BLOCK_MASK];
}
} // namespace Tegra
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