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GPU: Make the GPU virtual memory manager use 16 page bits and 10 page table bits. 

Also removed some dead code and added memory map consistency asserts.
This commit is contained in:
Subv 2018-04-23 10:57:12 -05:00
parent 62937798a0
commit f823c1d599
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};