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VMManager: remove all backing block related functions 

The shared_ptr<vector> type backing memory is unused now, and is not expected to be used in the future
This commit is contained in:
Weiyi Wang 2018-11-08 14:13:23 -05:00
parent 7f9873d7ec
commit b6ab4e466b
4 changed files with 1 additions and 77 deletions
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46
src/core/hle/kernel/vm_manager.cpp
View File

@ -28,10 +28,6 @@ bool VirtualMemoryArea::CanBeMergedWith(const VirtualMemoryArea& next) const {
type != next.type) {
return false;
}
if (type == VMAType::AllocatedMemoryBlock &&
(backing_block != next.backing_block || offset + size != next.offset)) {
return false;
}
if (type == VMAType::BackingMemory && backing_memory + size != next.backing_memory) {
return false;
}
@ -71,28 +67,6 @@ VMManager::VMAHandle VMManager::FindVMA(VAddr target) const {
}
}
ResultVal<VMManager::VMAHandle> VMManager::MapMemoryBlock(VAddr target,
std::shared_ptr<std::vector<u8>> block,
std::size_t offset, u32 size,
MemoryState state) {
ASSERT(block != nullptr);
ASSERT(offset + size <= block->size());
// This is the appropriately sized VMA that will turn into our allocation.
CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size));
VirtualMemoryArea& final_vma = vma_handle->second;
ASSERT(final_vma.size == size);
final_vma.type = VMAType::AllocatedMemoryBlock;
final_vma.permissions = VMAPermission::ReadWrite;
final_vma.meminfo_state = state;
final_vma.backing_block = block;
final_vma.offset = offset;
UpdatePageTableForVMA(final_vma);
return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
}
ResultVal<VAddr> VMManager::MapBackingMemoryToBase(VAddr base, u32 region_size, u8* memory,
u32 size, MemoryState state) {
@ -197,8 +171,6 @@ VMManager::VMAIter VMManager::Unmap(VMAIter vma_handle) {
vma.permissions = VMAPermission::None;
vma.meminfo_state = MemoryState::Free;
vma.backing_block = nullptr;
vma.offset = 0;
vma.backing_memory = nullptr;
vma.paddr = 0;
@ -246,17 +218,6 @@ ResultCode VMManager::ReprotectRange(VAddr target, u32 size, VMAPermission new_p
return RESULT_SUCCESS;
}
void VMManager::RefreshMemoryBlockMappings(const std::vector<u8>* block) {
// If this ever proves to have a noticeable performance impact, allow users of the function to
// specify a specific range of addresses to limit the scan to.
for (const auto& p : vma_map) {
const VirtualMemoryArea& vma = p.second;
if (block == vma.backing_block.get()) {
UpdatePageTableForVMA(vma);
}
}
}
void VMManager::LogLayout(Log::Level log_level) const {
for (const auto& p : vma_map) {
const VirtualMemoryArea& vma = p.second;
@ -355,9 +316,6 @@ VMManager::VMAIter VMManager::SplitVMA(VMAIter vma_handle, u32 offset_in_vma) {
switch (new_vma.type) {
case VMAType::Free:
break;
case VMAType::AllocatedMemoryBlock:
new_vma.offset += offset_in_vma;
break;
case VMAType::BackingMemory:
new_vma.backing_memory += offset_in_vma;
break;
@ -395,10 +353,6 @@ void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
case VMAType::Free:
Memory::UnmapRegion(page_table, vma.base, vma.size);
break;
case VMAType::AllocatedMemoryBlock:
Memory::MapMemoryRegion(page_table, vma.base, vma.size,
vma.backing_block->data() + vma.offset);
break;
case VMAType::BackingMemory:
Memory::MapMemoryRegion(page_table, vma.base, vma.size, vma.backing_memory);
break;

27
src/core/hle/kernel/vm_manager.h
View File

@ -18,13 +18,10 @@ namespace Kernel {
enum class VMAType : u8 {
/// VMA represents an unmapped region of the address space.
Free,
/// VMA is backed by a ref-counted allocate memory block.
AllocatedMemoryBlock,
/// VMA is backed by a raw, unmanaged pointer.
BackingMemory,
/// VMA is mapped to MMIO registers at a fixed PAddr.
MMIO,
// TODO(yuriks): Implement MemoryAlias to support MAP/UNMAP
};
/// Permissions for mapped memory blocks
@ -72,12 +69,6 @@ struct VirtualMemoryArea {
/// Tag returned by svcQueryMemory. Not otherwise used.
MemoryState meminfo_state = MemoryState::Free;
// Settings for type = AllocatedMemoryBlock
/// Memory block backing this VMA.
std::shared_ptr<std::vector<u8>> backing_block = nullptr;
/// Offset into the backing_memory the mapping starts from.
std::size_t offset = 0;
// Settings for type = BackingMemory
/// Pointer backing this VMA. It will not be destroyed or freed when the VMA is removed.
u8* backing_memory = nullptr;
@ -133,18 +124,6 @@ public:
// TODO(yuriks): Should these functions actually return the handle?
/**
* Maps part of a ref-counted block of memory at a given address.
*
* @param target The guest address to start the mapping at.
* @param block The block to be mapped.
* @param offset Offset into `block` to map from.
* @param size Size of the mapping.
* @param state MemoryState tag to attach to the VMA.
*/
ResultVal<VMAHandle> MapMemoryBlock(VAddr target, std::shared_ptr<std::vector<u8>> block,
std::size_t offset, u32 size, MemoryState state);
/**
* Maps part of a ref-counted block of memory at the first free address after the given base.
*
@ -203,12 +182,6 @@ public:
/// Changes the permissions of a range of addresses, splitting VMAs as necessary.
ResultCode ReprotectRange(VAddr target, u32 size, VMAPermission new_perms);
/**
* Scans all VMAs and updates the page table range of any that use the given vector as backing
* memory. This should be called after any operation that causes reallocation of the vector.
*/
void RefreshMemoryBlockMappings(const std::vector<u8>* block);
/// Dumps the address space layout to the log, for debugging
void LogLayout(Log::Level log_level) const;

3
src/core/memory.cpp
View File

@ -92,9 +92,6 @@ static u8* GetPointerFromVMA(const Kernel::Process& process, VAddr vaddr) {
auto& vma = it->second;
switch (vma.type) {
case Kernel::VMAType::AllocatedMemoryBlock:
direct_pointer = vma.backing_block->data() + vma.offset;
break;
case Kernel::VMAType::BackingMemory:
direct_pointer = vma.backing_memory;
break;

2
src/tests/core/memory/vm_manager.cpp
View File

@ -39,7 +39,7 @@ TEST_CASE("Memory Basics", "[kernel][memory]") {
auto vma = manager->FindVMA(Memory::HEAP_VADDR);
CHECK(vma != manager->vma_map.end());
CHECK(vma->second.type == Kernel::VMAType::Free);
CHECK(vma->second.backing_block == nullptr);
CHECK(vma->second.backing_memory == nullptr);
}
SECTION("changing memory permissions") {