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core: hle: kernel: KPageTable: Improve Un/MapPhysicalMemory.

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- Improves the implementations of MapPhysicalMemory and UnmapPhysicalMemory to more closely reflect latest HOS.
This commit is contained in:
bunnei 2022-02-18 23:42:27 -08:00
parent 83a84f1c2d
commit 1a16d055df
3 changed files with 501 additions and 106 deletions
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58
src/common/page_table.cpp
View file

@ -10,11 +10,65 @@ PageTable::PageTable() = default;
PageTable::~PageTable() noexcept = default;
void PageTable::Resize(size_t address_space_width_in_bits, size_t page_size_in_bits) {
const size_t num_page_table_entries{1ULL << (address_space_width_in_bits - page_size_in_bits)};
bool PageTable::BeginTraversal(TraversalEntry* out_entry, TraversalContext* out_context,
u64 address) const {
// Setup invalid defaults.
out_entry->phys_addr = 0;
out_entry->block_size = page_size;
out_context->next_page = 0;
// Validate that we can read the actual entry.
const auto page = address / page_size;
if (page >= backing_addr.size()) {
return false;
}
// Validate that the entry is mapped.
const auto phys_addr = backing_addr[page];
if (phys_addr == 0) {
return false;
}
// Populate the results.
out_entry->phys_addr = phys_addr + address;
out_context->next_page = page + 1;
out_context->next_offset = address + page_size;
return true;
}
bool PageTable::ContinueTraversal(TraversalEntry* out_entry, TraversalContext* context) const {
// Setup invalid defaults.
out_entry->phys_addr = 0;
out_entry->block_size = page_size;
// Validate that we can read the actual entry.
const auto page = context->next_page;
if (page >= backing_addr.size()) {
return false;
}
// Validate that the entry is mapped.
const auto phys_addr = backing_addr[page];
if (phys_addr == 0) {
return false;
}
// Populate the results.
out_entry->phys_addr = phys_addr + context->next_offset;
context->next_page = page + 1;
context->next_offset += page_size;
return true;
}
void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits) {
const std::size_t num_page_table_entries{1ULL
<< (address_space_width_in_bits - page_size_in_bits)};
pointers.resize(num_page_table_entries);
backing_addr.resize(num_page_table_entries);
current_address_space_width_in_bits = address_space_width_in_bits;
page_size = 1ULL << page_size_in_bits;
}
} // namespace Common

24
src/common/page_table.h
View file

@ -27,6 +27,16 @@ enum class PageType : u8 {
* mimics the way a real CPU page table works.
*/
struct PageTable {
struct TraversalEntry {
u64 phys_addr{};
std::size_t block_size{};
};
struct TraversalContext {
u64 next_page{};
u64 next_offset{};
};
/// Number of bits reserved for attribute tagging.
/// This can be at most the guaranteed alignment of the pointers in the page table.
static constexpr int ATTRIBUTE_BITS = 2;
@ -89,6 +99,10 @@ struct PageTable {
PageTable(PageTable&&) noexcept = default;
PageTable& operator=(PageTable&&) noexcept = default;
bool BeginTraversal(TraversalEntry* out_entry, TraversalContext* out_context,
u64 address) const;
bool ContinueTraversal(TraversalEntry* out_entry, TraversalContext* context) const;
/**
* Resizes the page table to be able to accommodate enough pages within
* a given address space.
@ -96,9 +110,9 @@ struct PageTable {
* @param address_space_width_in_bits The address size width in bits.
* @param page_size_in_bits The page size in bits.
*/
void Resize(size_t address_space_width_in_bits, size_t page_size_in_bits);
void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits);
size_t GetAddressSpaceBits() const {
std::size_t GetAddressSpaceBits() const {
return current_address_space_width_in_bits;
}
@ -110,9 +124,11 @@ struct PageTable {
VirtualBuffer<u64> backing_addr;
size_t current_address_space_width_in_bits;
std::size_t current_address_space_width_in_bits{};
u8* fastmem_arena;
u8* fastmem_arena{};
std::size_t page_size{};
};
} // namespace Common

511
src/core/hle/kernel/k_page_table.cpp
View file

@ -400,148 +400,473 @@ ResultCode KPageTable::UnmapProcessMemory(VAddr dst_addr, std::size_t size,
return ResultSuccess;
}
ResultCode KPageTable::MapPhysicalMemory(VAddr addr, std::size_t size) {
ResultCode KPageTable::MapPhysicalMemory(VAddr address, std::size_t size) {
// Lock the physical memory lock.
KScopedLightLock map_phys_mem_lk(map_physical_memory_lock);
// Calculate the last address for convenience.
const VAddr last_address = address + size - 1;
// Define iteration variables.
VAddr cur_address;
std::size_t mapped_size;
// The entire mapping process can be retried.
while (true) {
// Check if the memory is already mapped.
{
// Lock the table.
KScopedLightLock lk(general_lock);
std::size_t mapped_size{};
const VAddr end_addr{addr + size};
// Iterate over the memory.
cur_address = address;
mapped_size = 0;
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state != KMemoryState::Free) {
mapped_size += GetSizeInRange(info, addr, end_addr);
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
// Check if we're done.
if (last_address <= info.GetLastAddress()) {
if (info.GetState() != KMemoryState::Free) {
mapped_size += (last_address + 1 - cur_address);
}
break;
}
// Track the memory if it's mapped.
if (info.GetState() != KMemoryState::Free) {
mapped_size += VAddr(info.GetEndAddress()) - cur_address;
}
// Advance.
cur_address = info.GetEndAddress();
++it;
}
// If the size mapped is the size requested, we've nothing to do.
R_SUCCEED_IF(size == mapped_size);
}
// Allocate and map the memory.
{
// Reserve the memory from the process resource limit.
KScopedResourceReservation memory_reservation(
system.Kernel().CurrentProcess()->GetResourceLimit(),
LimitableResource::PhysicalMemory, size - mapped_size);
R_UNLESS(memory_reservation.Succeeded(), ResultLimitReached);
// Allocate pages for the new memory.
KPageLinkedList page_linked_list;
R_TRY(system.Kernel().MemoryManager().Allocate(
page_linked_list, (size - mapped_size) / PageSize, memory_pool, allocation_option));
// Map the memory.
{
// Lock the table.
KScopedLightLock lk(general_lock);
size_t num_allocator_blocks = 0;
// Verify that nobody has mapped memory since we first checked.
{
// Iterate over the memory.
size_t checked_mapped_size = 0;
cur_address = address;
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
const bool is_free = info.GetState() == KMemoryState::Free;
if (is_free) {
if (info.GetAddress() < address) {
++num_allocator_blocks;
}
if (last_address < info.GetLastAddress()) {
++num_allocator_blocks;
}
}
// Check if we're done.
if (last_address <= info.GetLastAddress()) {
if (!is_free) {
checked_mapped_size += (last_address + 1 - cur_address);
}
break;
}
// Track the memory if it's mapped.
if (!is_free) {
checked_mapped_size += VAddr(info.GetEndAddress()) - cur_address;
}
// Advance.
cur_address = info.GetEndAddress();
++it;
}
// If the size now isn't what it was before, somebody mapped or unmapped
// concurrently. If this happened, retry.
if (mapped_size != checked_mapped_size) {
continue;
}
}
// Reset the current tracking address, and make sure we clean up on failure.
cur_address = address;
auto unmap_guard = detail::ScopeExit([&] {
if (cur_address > address) {
const VAddr last_unmap_address = cur_address - 1;
// Iterate, unmapping the pages.
cur_address = address;
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
// If the memory state is free, we mapped it and need to unmap it.
if (info.GetState() == KMemoryState::Free) {
// Determine the range to unmap.
const size_t cur_pages =
std::min(VAddr(info.GetEndAddress()) - cur_address,
last_unmap_address + 1 - cur_address) /
PageSize;
// Unmap.
ASSERT(Operate(cur_address, cur_pages, KMemoryPermission::None,
OperationType::Unmap)
.IsSuccess());
}
// Check if we're done.
if (last_unmap_address <= info.GetLastAddress()) {
break;
}
// Advance.
cur_address = info.GetEndAddress();
++it;
}
}
});
if (mapped_size == size) {
return ResultSuccess;
// Iterate over the memory.
auto pg_it = page_linked_list.Nodes().begin();
PAddr pg_phys_addr = pg_it->GetAddress();
size_t pg_pages = pg_it->GetNumPages();
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
// If it's unmapped, we need to map it.
if (info.GetState() == KMemoryState::Free) {
// Determine the range to map.
size_t map_pages = std::min(VAddr(info.GetEndAddress()) - cur_address,
last_address + 1 - cur_address) /
PageSize;
// While we have pages to map, map them.
while (map_pages > 0) {
// Check if we're at the end of the physical block.
if (pg_pages == 0) {
// Ensure there are more pages to map.
ASSERT(pg_it != page_linked_list.Nodes().end());
// Advance our physical block.
++pg_it;
pg_phys_addr = pg_it->GetAddress();
pg_pages = pg_it->GetNumPages();
}
const std::size_t remaining_size{size - mapped_size};
const std::size_t remaining_pages{remaining_size / PageSize};
// Map whatever we can.
const size_t cur_pages = std::min(pg_pages, map_pages);
R_TRY(Operate(cur_address, cur_pages, KMemoryPermission::UserReadWrite,
OperationType::Map, pg_phys_addr));
// Reserve the memory from the process resource limit.
KScopedResourceReservation memory_reservation(
system.Kernel().CurrentProcess()->GetResourceLimit(), LimitableResource::PhysicalMemory,
remaining_size);
if (!memory_reservation.Succeeded()) {
LOG_ERROR(Kernel, "Could not reserve remaining {:X} bytes", remaining_size);
return ResultLimitReached;
// Advance.
cur_address += cur_pages * PageSize;
map_pages -= cur_pages;
pg_phys_addr += cur_pages * PageSize;
pg_pages -= cur_pages;
}
}
KPageLinkedList page_linked_list;
// Check if we're done.
if (last_address <= info.GetLastAddress()) {
break;
}
CASCADE_CODE(system.Kernel().MemoryManager().Allocate(page_linked_list, remaining_pages,
memory_pool, allocation_option));
// Advance.
cur_address = info.GetEndAddress();
++it;
}
// We succeeded, so commit the memory reservation.
memory_reservation.Commit();
// Map the memory.
auto node{page_linked_list.Nodes().begin()};
PAddr map_addr{node->GetAddress()};
std::size_t src_num_pages{node->GetNumPages()};
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state != KMemoryState::Free) {
return;
}
// Increase our tracked mapped size.
mapped_physical_memory_size += (size - mapped_size);
std::size_t dst_num_pages{GetSizeInRange(info, addr, end_addr) / PageSize};
VAddr dst_addr{GetAddressInRange(info, addr)};
// Update the relevant memory blocks.
block_manager->Update(address, size / PageSize, KMemoryState::Free,
KMemoryPermission::None, KMemoryAttribute::None,
KMemoryState::Normal, KMemoryPermission::UserReadWrite,
KMemoryAttribute::None);
while (dst_num_pages) {
if (!src_num_pages) {
node = std::next(node);
map_addr = node->GetAddress();
src_num_pages = node->GetNumPages();
}
const std::size_t num_pages{std::min(src_num_pages, dst_num_pages)};
Operate(dst_addr, num_pages, KMemoryPermission::UserReadWrite, OperationType::Map,
map_addr);
dst_addr += num_pages * PageSize;
map_addr += num_pages * PageSize;
src_num_pages -= num_pages;
dst_num_pages -= num_pages;
}
});
mapped_physical_memory_size += remaining_size;
const std::size_t num_pages{size / PageSize};
block_manager->Update(addr, num_pages, KMemoryState::Free, KMemoryPermission::None,
KMemoryAttribute::None, KMemoryState::Normal,
KMemoryPermission::UserReadWrite, KMemoryAttribute::None);
// Cancel our guard.
unmap_guard.Cancel();
return ResultSuccess;
}
}
}
}
ResultCode KPageTable::UnmapPhysicalMemory(VAddr addr, std::size_t size) {
ResultCode KPageTable::UnmapPhysicalMemory(VAddr address, std::size_t size) {
// Lock the physical memory lock.
KScopedLightLock map_phys_mem_lk(map_physical_memory_lock);
// Lock the table.
KScopedLightLock lk(general_lock);
const VAddr end_addr{addr + size};
ResultCode result{ResultSuccess};
std::size_t mapped_size{};
// Calculate the last address for convenience.
const VAddr last_address = address + size - 1;
// Verify that the region can be unmapped
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state == KMemoryState::Normal) {
if (info.attribute != KMemoryAttribute::None) {
result = ResultInvalidCurrentMemory;
return;
}
mapped_size += GetSizeInRange(info, addr, end_addr);
} else if (info.state != KMemoryState::Free) {
result = ResultInvalidCurrentMemory;
}
});
// Define iteration variables.
VAddr cur_address = 0;
std::size_t mapped_size = 0;
std::size_t num_allocator_blocks = 0;
if (result.IsError()) {
return result;
// Check if the memory is mapped.
{
// Iterate over the memory.
cur_address = address;
mapped_size = 0;
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
// Verify the memory's state.
const bool is_normal = info.GetState() == KMemoryState::Normal &&
info.GetAttribute() == KMemoryAttribute::None;
const bool is_free = info.GetState() == KMemoryState::Free;
R_UNLESS(is_normal || is_free, ResultInvalidCurrentMemory);
if (is_normal) {
R_UNLESS(info.GetAttribute() == KMemoryAttribute::None, ResultInvalidCurrentMemory);
if (info.GetAddress() < address) {
++num_allocator_blocks;
}
if (last_address < info.GetLastAddress()) {
++num_allocator_blocks;
}
}
if (!mapped_size) {
return ResultSuccess;
// Check if we're done.
if (last_address <= info.GetLastAddress()) {
if (is_normal) {
mapped_size += (last_address + 1 - cur_address);
}
break;
}
// Unmap each region within the range
KPageLinkedList page_linked_list;
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state == KMemoryState::Normal) {
const std::size_t block_size{GetSizeInRange(info, addr, end_addr)};
const std::size_t block_num_pages{block_size / PageSize};
const VAddr block_addr{GetAddressInRange(info, addr)};
// Track the memory if it's mapped.
if (is_normal) {
mapped_size += VAddr(info.GetEndAddress()) - cur_address;
}
AddRegionToPages(block_addr, block_size / PageSize, page_linked_list);
// Advance.
cur_address = info.GetEndAddress();
++it;
}
if (result = Operate(block_addr, block_num_pages, KMemoryPermission::None,
OperationType::Unmap);
result.IsError()) {
return;
// If there's nothing mapped, we've nothing to do.
R_SUCCEED_IF(mapped_size == 0);
}
// Make a page group for the unmap region.
KPageLinkedList pg;
{
auto& impl = this->PageTableImpl();
// Begin traversal.
Common::PageTable::TraversalContext context;
Common::PageTable::TraversalEntry cur_entry = {.phys_addr = 0, .block_size = 0};
bool cur_valid = false;
Common::PageTable::TraversalEntry next_entry;
bool next_valid = false;
size_t tot_size = 0;
cur_address = address;
next_valid =
impl.BeginTraversal(std::addressof(next_entry), std::addressof(context), cur_address);
next_entry.block_size =
(next_entry.block_size - (next_entry.phys_addr & (next_entry.block_size - 1)));
// Iterate, building the group.
while (true) {
if ((!next_valid && !cur_valid) ||
(next_valid && cur_valid &&
next_entry.phys_addr == cur_entry.phys_addr + cur_entry.block_size)) {
cur_entry.block_size += next_entry.block_size;
} else {
if (cur_valid) {
// ASSERT(IsHeapPhysicalAddress(cur_entry.phys_addr));
R_TRY(pg.AddBlock(cur_entry.phys_addr, cur_entry.block_size / PageSize));
}
// Update tracking variables.
tot_size += cur_entry.block_size;
cur_entry = next_entry;
cur_valid = next_valid;
}
if (cur_entry.block_size + tot_size >= size) {
break;
}
next_valid =
impl.ContinueTraversal(std::addressof(next_entry), std::addressof(context));
}
// Add the last block.
if (cur_valid) {
// ASSERT(IsHeapPhysicalAddress(cur_entry.phys_addr));
R_TRY(pg.AddBlock(cur_entry.phys_addr, (size - tot_size) / PageSize));
}
}
ASSERT(pg.GetNumPages() == mapped_size / PageSize);
// Reset the current tracking address, and make sure we clean up on failure.
cur_address = address;
auto remap_guard = detail::ScopeExit([&] {
if (cur_address > address) {
const VAddr last_map_address = cur_address - 1;
cur_address = address;
// Iterate over the memory we unmapped.
auto it = block_manager->FindIterator(cur_address);
auto pg_it = pg.Nodes().begin();
PAddr pg_phys_addr = pg_it->GetAddress();
size_t pg_pages = pg_it->GetNumPages();
while (true) {
// Get the memory info for the pages we unmapped, convert to property.
const KMemoryInfo info = it->GetMemoryInfo();
// If the memory is normal, we unmapped it and need to re-map it.
if (info.GetState() == KMemoryState::Normal) {
// Determine the range to map.
size_t map_pages = std::min(VAddr(info.GetEndAddress()) - cur_address,
last_map_address + 1 - cur_address) /
PageSize;
// While we have pages to map, map them.
while (map_pages > 0) {
// Check if we're at the end of the physical block.
if (pg_pages == 0) {
// Ensure there are more pages to map.
ASSERT(pg_it != pg.Nodes().end());
// Advance our physical block.
++pg_it;
pg_phys_addr = pg_it->GetAddress();
pg_pages = pg_it->GetNumPages();
}
// Map whatever we can.
const size_t cur_pages = std::min(pg_pages, map_pages);
ASSERT(this->Operate(cur_address, cur_pages, info.GetPermission(),
OperationType::Map, pg_phys_addr) == ResultSuccess);
// Advance.
cur_address += cur_pages * PageSize;
map_pages -= cur_pages;
pg_phys_addr += cur_pages * PageSize;
pg_pages -= cur_pages;
}
}
// Check if we're done.
if (last_map_address <= info.GetLastAddress()) {
break;
}
// Advance.
++it;
}
}
});
if (result.IsError()) {
return result;
// Iterate over the memory, unmapping as we go.
auto it = block_manager->FindIterator(cur_address);
while (true) {
// Check that the iterator is valid.
ASSERT(it != block_manager->end());
// Get the memory info.
const KMemoryInfo info = it->GetMemoryInfo();
// If the memory state is normal, we need to unmap it.
if (info.GetState() == KMemoryState::Normal) {
// Determine the range to unmap.
const size_t cur_pages = std::min(VAddr(info.GetEndAddress()) - cur_address,
last_address + 1 - cur_address) /
PageSize;
// Unmap.
R_TRY(Operate(cur_address, cur_pages, KMemoryPermission::None, OperationType::Unmap));
}
const std::size_t num_pages{size / PageSize};
system.Kernel().MemoryManager().Free(page_linked_list, num_pages, memory_pool,
allocation_option);
// Check if we're done.
if (last_address <= info.GetLastAddress()) {
break;
}
block_manager->Update(addr, num_pages, KMemoryState::Free);
// Advance.
cur_address = info.GetEndAddress();
++it;
}
// Release the memory resource.
mapped_physical_memory_size -= mapped_size;
auto process{system.Kernel().CurrentProcess()};
process->GetResourceLimit()->Release(LimitableResource::PhysicalMemory, mapped_size);
mapped_physical_memory_size -= mapped_size;
// Update memory blocks.
system.Kernel().MemoryManager().Free(pg, size / PageSize, memory_pool, allocation_option);
block_manager->Update(address, size / PageSize, KMemoryState::Free, KMemoryPermission::None,
KMemoryAttribute::None);
// We succeeded.
remap_guard.Cancel();
return ResultSuccess;
}