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Merge pull request #383 from Subv/gpu_mmu

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GPU: Make the GPU virtual memory manager use 16 page bits and 10 pagetable bits.
This commit is contained in:
bunnei 2018-04-23 14:00:52 -04:00 committed by GitHub
commit 3967f9c6ef
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 25 additions and 34 deletions
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53
src/video_core/memory_manager.cpp
View file

@ -2,6 +2,7 @@
// 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"
@ -11,7 +12,8 @@ PAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
boost::optional<PAddr> paddr = FindFreeBlock(size, align);
ASSERT(paddr);
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(*paddr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(*paddr + offset) = static_cast<u64>(PageStatus::Allocated);
}
@ -19,13 +21,8 @@ PAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
}
PAddr MemoryManager::AllocateSpace(PAddr paddr, u64 size, u64 align) {
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
if (IsPageMapped(paddr + offset)) {
return AllocateSpace(size, align);
}
}
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(paddr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(paddr + offset) = static_cast<u64>(PageStatus::Allocated);
}
@ -33,12 +30,11 @@ PAddr MemoryManager::AllocateSpace(PAddr paddr, u64 size, u64 align) {
}
PAddr MemoryManager::MapBufferEx(VAddr vaddr, u64 size) {
vaddr &= ~Memory::PAGE_MASK;
boost::optional<PAddr> paddr = FindFreeBlock(size);
boost::optional<PAddr> paddr = FindFreeBlock(size, PAGE_SIZE);
ASSERT(paddr);
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(*paddr + offset) == static_cast<u64>(PageStatus::Unmapped));
PageSlot(*paddr + offset) = vaddr + offset;
}
@ -46,16 +42,10 @@ PAddr MemoryManager::MapBufferEx(VAddr vaddr, u64 size) {
}
PAddr MemoryManager::MapBufferEx(VAddr vaddr, PAddr paddr, u64 size) {
vaddr &= ~Memory::PAGE_MASK;
paddr &= ~Memory::PAGE_MASK;
ASSERT((paddr & PAGE_MASK) == 0);
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
if (PageSlot(paddr + offset) != static_cast<u64>(PageStatus::Allocated)) {
return MapBufferEx(vaddr, size);
}
}
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
for (u64 offset = 0; offset < size; offset += PAGE_SIZE) {
ASSERT(PageSlot(paddr + offset) == static_cast<u64>(PageStatus::Allocated));
PageSlot(paddr + offset) = vaddr + offset;
}
@ -63,23 +53,20 @@ PAddr MemoryManager::MapBufferEx(VAddr vaddr, PAddr paddr, u64 size) {
}
boost::optional<PAddr> MemoryManager::FindFreeBlock(u64 size, u64 align) {
PAddr paddr{};
u64 free_space{};
align = (align + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
PAddr paddr = 0;
u64 free_space = 0;
align = (align + PAGE_MASK) & ~PAGE_MASK;
while (paddr + free_space < MAX_ADDRESS) {
if (!IsPageMapped(paddr + free_space)) {
free_space += Memory::PAGE_SIZE;
free_space += PAGE_SIZE;
if (free_space >= size) {
return paddr;
}
} else {
paddr += free_space + Memory::PAGE_SIZE;
paddr += free_space + PAGE_SIZE;
free_space = 0;
const u64 remainder{paddr % align};
if (!remainder) {
paddr = (paddr - remainder) + align;
}
paddr = Common::AlignUp(paddr, align);
}
}
@ -89,7 +76,7 @@ boost::optional<PAddr> MemoryManager::FindFreeBlock(u64 size, u64 align) {
VAddr MemoryManager::PhysicalToVirtualAddress(PAddr paddr) {
VAddr base_addr = PageSlot(paddr);
ASSERT(base_addr != static_cast<u64>(PageStatus::Unmapped));
return base_addr + (paddr & Memory::PAGE_MASK);
return base_addr + (paddr & PAGE_MASK);
}
bool MemoryManager::IsPageMapped(PAddr paddr) {
@ -97,14 +84,14 @@ bool MemoryManager::IsPageMapped(PAddr paddr) {
}
VAddr& MemoryManager::PageSlot(PAddr paddr) {
auto& block = page_table[(paddr >> (Memory::PAGE_BITS + PAGE_TABLE_BITS)) & PAGE_TABLE_MASK];
auto& block = page_table[(paddr >> (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)[(paddr >> Memory::PAGE_BITS) & PAGE_BLOCK_MASK];
return (*block)[(paddr >> PAGE_BITS) & PAGE_BLOCK_MASK];
}
} // namespace Tegra

6
src/video_core/memory_manager.h
View file

@ -24,6 +24,10 @@ public:
PAddr MapBufferEx(VAddr vaddr, PAddr paddr, u64 size);
VAddr PhysicalToVirtualAddress(PAddr paddr);
static constexpr u64 PAGE_BITS = 16;
static constexpr u64 PAGE_SIZE = 1 << PAGE_BITS;
static constexpr u64 PAGE_MASK = PAGE_SIZE - 1;
private:
boost::optional<PAddr> FindFreeBlock(u64 size, u64 align = 1);
bool IsPageMapped(PAddr paddr);
@ -35,7 +39,7 @@ private:
};
static constexpr u64 MAX_ADDRESS{0x10000000000ULL};
static constexpr u64 PAGE_TABLE_BITS{14};
static constexpr u64 PAGE_TABLE_BITS{10};
static constexpr u64 PAGE_TABLE_SIZE{1 << PAGE_TABLE_BITS};
static constexpr u64 PAGE_TABLE_MASK{PAGE_TABLE_SIZE - 1};
static constexpr u64 PAGE_BLOCK_BITS{14};