544 lines
21 KiB
C++
544 lines
21 KiB
C++
#ifdef _WIN32
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#include <iterator>
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#include <unordered_map>
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#include <boost/icl/separate_interval_set.hpp>
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#include <windows.h>
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#include "common/dynamic_library.h"
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#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#endif // ^^^ Linux ^^^
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#include <mutex>
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#include "common/alignment.h"
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#include "common/assert.h"
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#include "common/host_memory.h"
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#include "common/logging/log.h"
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#include "common/scope_exit.h"
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namespace Common {
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constexpr size_t PageAlignment = 0x1000;
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constexpr size_t HugePageSize = 0x200000;
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#ifdef _WIN32
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// Manually imported for MinGW compatibility
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#ifndef MEM_RESERVE_PLACEHOLDER
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#define MEM_RESERVE_PLACEHOLDER 0x00040000
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#endif
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#ifndef MEM_REPLACE_PLACEHOLDER
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#define MEM_REPLACE_PLACEHOLDER 0x00004000
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#endif
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#ifndef MEM_COALESCE_PLACEHOLDERS
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#define MEM_COALESCE_PLACEHOLDERS 0x00000001
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#endif
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#ifndef MEM_PRESERVE_PLACEHOLDER
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#define MEM_PRESERVE_PLACEHOLDER 0x00000002
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#endif
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using PFN_CreateFileMapping2 = _Ret_maybenull_ HANDLE(WINAPI*)(
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_In_ HANDLE File, _In_opt_ SECURITY_ATTRIBUTES* SecurityAttributes, _In_ ULONG DesiredAccess,
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_In_ ULONG PageProtection, _In_ ULONG AllocationAttributes, _In_ ULONG64 MaximumSize,
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_In_opt_ PCWSTR Name,
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_Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters,
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_In_ ULONG ParameterCount);
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using PFN_VirtualAlloc2 = _Ret_maybenull_ PVOID(WINAPI*)(
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_In_opt_ HANDLE Process, _In_opt_ PVOID BaseAddress, _In_ SIZE_T Size,
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_In_ ULONG AllocationType, _In_ ULONG PageProtection,
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_Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters,
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_In_ ULONG ParameterCount);
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using PFN_MapViewOfFile3 = _Ret_maybenull_ PVOID(WINAPI*)(
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_In_ HANDLE FileMapping, _In_opt_ HANDLE Process, _In_opt_ PVOID BaseAddress,
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_In_ ULONG64 Offset, _In_ SIZE_T ViewSize, _In_ ULONG AllocationType, _In_ ULONG PageProtection,
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_Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters,
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_In_ ULONG ParameterCount);
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using PFN_UnmapViewOfFile2 = BOOL(WINAPI*)(_In_ HANDLE Process, _In_ PVOID BaseAddress,
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_In_ ULONG UnmapFlags);
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template <typename T>
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static void GetFuncAddress(Common::DynamicLibrary& dll, const char* name, T& pfn) {
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if (!dll.GetSymbol(name, &pfn)) {
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LOG_CRITICAL(HW_Memory, "Failed to load {}", name);
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throw std::bad_alloc{};
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}
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}
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class HostMemory::Impl {
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public:
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explicit Impl(size_t backing_size_, size_t virtual_size_)
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: backing_size{backing_size_}, virtual_size{virtual_size_}, process{GetCurrentProcess()},
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kernelbase_dll("Kernelbase") {
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if (!kernelbase_dll.IsOpen()) {
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LOG_CRITICAL(HW_Memory, "Failed to load Kernelbase.dll");
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throw std::bad_alloc{};
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}
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GetFuncAddress(kernelbase_dll, "CreateFileMapping2", pfn_CreateFileMapping2);
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GetFuncAddress(kernelbase_dll, "VirtualAlloc2", pfn_VirtualAlloc2);
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GetFuncAddress(kernelbase_dll, "MapViewOfFile3", pfn_MapViewOfFile3);
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GetFuncAddress(kernelbase_dll, "UnmapViewOfFile2", pfn_UnmapViewOfFile2);
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// Allocate backing file map
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backing_handle =
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pfn_CreateFileMapping2(INVALID_HANDLE_VALUE, nullptr, FILE_MAP_WRITE | FILE_MAP_READ,
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PAGE_READWRITE, SEC_COMMIT, backing_size, nullptr, nullptr, 0);
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if (!backing_handle) {
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LOG_CRITICAL(HW_Memory, "Failed to allocate {} MiB of backing memory",
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backing_size >> 20);
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throw std::bad_alloc{};
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}
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// Allocate a virtual memory for the backing file map as placeholder
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backing_base = static_cast<u8*>(pfn_VirtualAlloc2(process, nullptr, backing_size,
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MEM_RESERVE | MEM_RESERVE_PLACEHOLDER,
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PAGE_NOACCESS, nullptr, 0));
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if (!backing_base) {
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Release();
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LOG_CRITICAL(HW_Memory, "Failed to reserve {} MiB of virtual memory",
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backing_size >> 20);
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throw std::bad_alloc{};
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}
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// Map backing placeholder
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void* const ret = pfn_MapViewOfFile3(backing_handle, process, backing_base, 0, backing_size,
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MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0);
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if (ret != backing_base) {
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Release();
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LOG_CRITICAL(HW_Memory, "Failed to map {} MiB of virtual memory", backing_size >> 20);
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throw std::bad_alloc{};
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}
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// Allocate virtual address placeholder
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virtual_base = static_cast<u8*>(pfn_VirtualAlloc2(process, nullptr, virtual_size,
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MEM_RESERVE | MEM_RESERVE_PLACEHOLDER,
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PAGE_NOACCESS, nullptr, 0));
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if (!virtual_base) {
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Release();
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LOG_CRITICAL(HW_Memory, "Failed to reserve {} GiB of virtual memory",
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virtual_size >> 30);
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throw std::bad_alloc{};
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}
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}
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~Impl() {
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Release();
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}
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void Map(size_t virtual_offset, size_t host_offset, size_t length) {
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std::unique_lock lock{placeholder_mutex};
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if (!IsNiechePlaceholder(virtual_offset, length)) {
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Split(virtual_offset, length);
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}
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ASSERT(placeholders.find({virtual_offset, virtual_offset + length}) == placeholders.end());
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TrackPlaceholder(virtual_offset, host_offset, length);
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MapView(virtual_offset, host_offset, length);
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}
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void Unmap(size_t virtual_offset, size_t length) {
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std::lock_guard lock{placeholder_mutex};
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// Unmap until there are no more placeholders
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while (UnmapOnePlaceholder(virtual_offset, length)) {
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}
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}
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void Protect(size_t virtual_offset, size_t length, bool read, bool write) {
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DWORD new_flags{};
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if (read && write) {
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new_flags = PAGE_READWRITE;
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} else if (read && !write) {
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new_flags = PAGE_READONLY;
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} else if (!read && !write) {
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new_flags = PAGE_NOACCESS;
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} else {
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UNIMPLEMENTED_MSG("Protection flag combination read={} write={}", read, write);
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}
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const size_t virtual_end = virtual_offset + length;
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std::lock_guard lock{placeholder_mutex};
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auto [it, end] = placeholders.equal_range({virtual_offset, virtual_end});
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while (it != end) {
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const size_t offset = std::max(it->lower(), virtual_offset);
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const size_t protect_length = std::min(it->upper(), virtual_end) - offset;
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DWORD old_flags{};
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if (!VirtualProtect(virtual_base + offset, protect_length, new_flags, &old_flags)) {
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LOG_CRITICAL(HW_Memory, "Failed to change virtual memory protect rules");
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}
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++it;
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}
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}
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const size_t backing_size; ///< Size of the backing memory in bytes
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const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
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u8* backing_base{};
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u8* virtual_base{};
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private:
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/// Release all resources in the object
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void Release() {
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if (!placeholders.empty()) {
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for (const auto& placeholder : placeholders) {
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if (!pfn_UnmapViewOfFile2(process, virtual_base + placeholder.lower(),
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MEM_PRESERVE_PLACEHOLDER)) {
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LOG_CRITICAL(HW_Memory, "Failed to unmap virtual memory placeholder");
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}
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}
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Coalesce(0, virtual_size);
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}
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if (virtual_base) {
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if (!VirtualFree(virtual_base, 0, MEM_RELEASE)) {
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LOG_CRITICAL(HW_Memory, "Failed to free virtual memory");
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}
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}
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if (backing_base) {
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if (!pfn_UnmapViewOfFile2(process, backing_base, MEM_PRESERVE_PLACEHOLDER)) {
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LOG_CRITICAL(HW_Memory, "Failed to unmap backing memory placeholder");
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}
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if (!VirtualFreeEx(process, backing_base, 0, MEM_RELEASE)) {
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LOG_CRITICAL(HW_Memory, "Failed to free backing memory");
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}
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}
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if (!CloseHandle(backing_handle)) {
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LOG_CRITICAL(HW_Memory, "Failed to free backing memory file handle");
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}
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}
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/// Unmap one placeholder in the given range (partial unmaps are supported)
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/// Return true when there are no more placeholders to unmap
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bool UnmapOnePlaceholder(size_t virtual_offset, size_t length) {
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const auto it = placeholders.find({virtual_offset, virtual_offset + length});
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const auto begin = placeholders.begin();
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const auto end = placeholders.end();
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if (it == end) {
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return false;
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}
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const size_t placeholder_begin = it->lower();
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const size_t placeholder_end = it->upper();
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const size_t unmap_begin = std::max(virtual_offset, placeholder_begin);
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const size_t unmap_end = std::min(virtual_offset + length, placeholder_end);
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ASSERT(unmap_begin >= placeholder_begin && unmap_begin < placeholder_end);
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ASSERT(unmap_end <= placeholder_end && unmap_end > placeholder_begin);
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const auto host_pointer_it = placeholder_host_pointers.find(placeholder_begin);
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ASSERT(host_pointer_it != placeholder_host_pointers.end());
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const size_t host_offset = host_pointer_it->second;
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const bool split_left = unmap_begin > placeholder_begin;
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const bool split_right = unmap_end < placeholder_end;
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if (!pfn_UnmapViewOfFile2(process, virtual_base + placeholder_begin,
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MEM_PRESERVE_PLACEHOLDER)) {
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LOG_CRITICAL(HW_Memory, "Failed to unmap placeholder");
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}
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// If we have to remap memory regions due to partial unmaps, we are in a data race as
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// Windows doesn't support remapping memory without unmapping first. Avoid adding any extra
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// logic within the panic region described below.
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// Panic region, we are in a data race right now
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if (split_left || split_right) {
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Split(unmap_begin, unmap_end - unmap_begin);
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}
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if (split_left) {
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MapView(placeholder_begin, host_offset, unmap_begin - placeholder_begin);
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}
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if (split_right) {
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MapView(unmap_end, host_offset + unmap_end - placeholder_begin,
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placeholder_end - unmap_end);
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}
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// End panic region
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size_t coalesce_begin = unmap_begin;
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if (!split_left) {
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// Try to coalesce pages to the left
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coalesce_begin = it == begin ? 0 : std::prev(it)->upper();
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if (coalesce_begin != placeholder_begin) {
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Coalesce(coalesce_begin, unmap_end - coalesce_begin);
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}
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}
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if (!split_right) {
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// Try to coalesce pages to the right
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const auto next = std::next(it);
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const size_t next_begin = next == end ? virtual_size : next->lower();
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if (placeholder_end != next_begin) {
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// We can coalesce to the right
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Coalesce(coalesce_begin, next_begin - coalesce_begin);
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}
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}
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// Remove and reinsert placeholder trackers
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UntrackPlaceholder(it);
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if (split_left) {
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TrackPlaceholder(placeholder_begin, host_offset, unmap_begin - placeholder_begin);
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}
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if (split_right) {
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TrackPlaceholder(unmap_end, host_offset + unmap_end - placeholder_begin,
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placeholder_end - unmap_end);
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}
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return true;
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}
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void MapView(size_t virtual_offset, size_t host_offset, size_t length) {
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if (!pfn_MapViewOfFile3(backing_handle, process, virtual_base + virtual_offset, host_offset,
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length, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0)) {
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LOG_CRITICAL(HW_Memory, "Failed to map placeholder");
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}
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}
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void Split(size_t virtual_offset, size_t length) {
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if (!VirtualFreeEx(process, reinterpret_cast<LPVOID>(virtual_base + virtual_offset), length,
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MEM_RELEASE | MEM_PRESERVE_PLACEHOLDER)) {
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LOG_CRITICAL(HW_Memory, "Failed to split placeholder");
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}
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}
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void Coalesce(size_t virtual_offset, size_t length) {
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if (!VirtualFreeEx(process, reinterpret_cast<LPVOID>(virtual_base + virtual_offset), length,
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MEM_RELEASE | MEM_COALESCE_PLACEHOLDERS)) {
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LOG_CRITICAL(HW_Memory, "Failed to coalesce placeholders");
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}
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}
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void TrackPlaceholder(size_t virtual_offset, size_t host_offset, size_t length) {
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placeholders.insert({virtual_offset, virtual_offset + length});
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placeholder_host_pointers.emplace(virtual_offset, host_offset);
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}
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void UntrackPlaceholder(boost::icl::separate_interval_set<size_t>::iterator it) {
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placeholders.erase(it);
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placeholder_host_pointers.erase(it->lower());
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}
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/// Return true when a given memory region is a "nieche" and the placeholders don't have to be
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/// splitted.
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bool IsNiechePlaceholder(size_t virtual_offset, size_t length) const {
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const auto it = placeholders.upper_bound({virtual_offset, virtual_offset + length});
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if (it != placeholders.end() && it->lower() == virtual_offset + length) {
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const bool is_root = it == placeholders.begin() && virtual_offset == 0;
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return is_root || std::prev(it)->upper() == virtual_offset;
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}
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return false;
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}
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HANDLE process{}; ///< Current process handle
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HANDLE backing_handle{}; ///< File based backing memory
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DynamicLibrary kernelbase_dll;
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PFN_CreateFileMapping2 pfn_CreateFileMapping2{};
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PFN_VirtualAlloc2 pfn_VirtualAlloc2{};
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PFN_MapViewOfFile3 pfn_MapViewOfFile3{};
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PFN_UnmapViewOfFile2 pfn_UnmapViewOfFile2{};
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std::mutex placeholder_mutex; ///< Mutex for placeholders
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boost::icl::separate_interval_set<size_t> placeholders; ///< Mapped placeholders
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std::unordered_map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
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};
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#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
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class HostMemory::Impl {
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public:
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explicit Impl(size_t backing_size_, size_t virtual_size_)
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: backing_size{backing_size_}, virtual_size{virtual_size_} {
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bool good = false;
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SCOPE_EXIT({
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if (!good) {
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Release();
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}
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});
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// Backing memory initialization
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#if defined(__FreeBSD__) && __FreeBSD__ < 13
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// XXX Drop after FreeBSD 12.* reaches EOL on 2024-06-30
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fd = shm_open(SHM_ANON, O_RDWR, 0600);
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#else
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fd = memfd_create("HostMemory", 0);
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#endif
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if (fd == -1) {
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LOG_CRITICAL(HW_Memory, "memfd_create failed: {}", strerror(errno));
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throw std::bad_alloc{};
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}
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// Defined to extend the file with zeros
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int ret = ftruncate(fd, backing_size);
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if (ret != 0) {
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LOG_CRITICAL(HW_Memory, "ftruncate failed with {}, are you out-of-memory?",
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strerror(errno));
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throw std::bad_alloc{};
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}
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backing_base = static_cast<u8*>(
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mmap(nullptr, backing_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
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if (backing_base == MAP_FAILED) {
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LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
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throw std::bad_alloc{};
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}
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// Virtual memory initialization
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virtual_base = static_cast<u8*>(
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mmap(nullptr, virtual_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
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if (virtual_base == MAP_FAILED) {
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LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
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throw std::bad_alloc{};
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}
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good = true;
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}
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~Impl() {
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Release();
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}
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void Map(size_t virtual_offset, size_t host_offset, size_t length) {
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void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_FIXED, fd, host_offset);
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ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
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}
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void Unmap(size_t virtual_offset, size_t length) {
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// The method name is wrong. We're still talking about the virtual range.
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// We don't want to unmap, we want to reserve this memory.
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void* ret = mmap(virtual_base + virtual_offset, length, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
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}
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void Protect(size_t virtual_offset, size_t length, bool read, bool write) {
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int flags = 0;
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if (read) {
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flags |= PROT_READ;
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}
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if (write) {
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flags |= PROT_WRITE;
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}
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int ret = mprotect(virtual_base + virtual_offset, length, flags);
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ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno));
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}
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const size_t backing_size; ///< Size of the backing memory in bytes
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const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
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u8* backing_base{reinterpret_cast<u8*>(MAP_FAILED)};
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u8* virtual_base{reinterpret_cast<u8*>(MAP_FAILED)};
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private:
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/// Release all resources in the object
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void Release() {
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if (virtual_base != MAP_FAILED) {
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int ret = munmap(virtual_base, virtual_size);
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ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
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}
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if (backing_base != MAP_FAILED) {
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int ret = munmap(backing_base, backing_size);
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ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
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}
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if (fd != -1) {
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int ret = close(fd);
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ASSERT_MSG(ret == 0, "close failed: {}", strerror(errno));
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}
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}
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int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
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};
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#else // ^^^ Linux ^^^ vvv Generic vvv
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class HostMemory::Impl {
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public:
|
|
explicit Impl(size_t /*backing_size */, size_t /* virtual_size */) {
|
|
// This is just a place holder.
|
|
// Please implement fastmem in a propper way on your platform.
|
|
throw std::bad_alloc{};
|
|
}
|
|
|
|
void Map(size_t virtual_offset, size_t host_offset, size_t length) {}
|
|
|
|
void Unmap(size_t virtual_offset, size_t length) {}
|
|
|
|
void Protect(size_t virtual_offset, size_t length, bool read, bool write) {}
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|
|
|
u8* backing_base{nullptr};
|
|
u8* virtual_base{nullptr};
|
|
};
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|
|
|
#endif // ^^^ Generic ^^^
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|
|
|
HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
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|
: backing_size(backing_size_), virtual_size(virtual_size_) {
|
|
try {
|
|
// Try to allocate a fastmem arena.
|
|
// The implementation will fail with std::bad_alloc on errors.
|
|
impl = std::make_unique<HostMemory::Impl>(AlignUp(backing_size, PageAlignment),
|
|
AlignUp(virtual_size, PageAlignment) +
|
|
3 * HugePageSize);
|
|
backing_base = impl->backing_base;
|
|
virtual_base = impl->virtual_base;
|
|
|
|
if (virtual_base) {
|
|
virtual_base += 2 * HugePageSize - 1;
|
|
virtual_base -= reinterpret_cast<size_t>(virtual_base) & (HugePageSize - 1);
|
|
virtual_base_offset = virtual_base - impl->virtual_base;
|
|
}
|
|
|
|
} catch (const std::bad_alloc&) {
|
|
LOG_CRITICAL(HW_Memory,
|
|
"Fastmem unavailable, falling back to VirtualBuffer for memory allocation");
|
|
fallback_buffer = std::make_unique<Common::VirtualBuffer<u8>>(backing_size);
|
|
backing_base = fallback_buffer->data();
|
|
virtual_base = nullptr;
|
|
}
|
|
}
|
|
|
|
HostMemory::~HostMemory() = default;
|
|
|
|
HostMemory::HostMemory(HostMemory&&) noexcept = default;
|
|
|
|
HostMemory& HostMemory::operator=(HostMemory&&) noexcept = default;
|
|
|
|
void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length) {
|
|
ASSERT(virtual_offset % PageAlignment == 0);
|
|
ASSERT(host_offset % PageAlignment == 0);
|
|
ASSERT(length % PageAlignment == 0);
|
|
ASSERT(virtual_offset + length <= virtual_size);
|
|
ASSERT(host_offset + length <= backing_size);
|
|
if (length == 0 || !virtual_base || !impl) {
|
|
return;
|
|
}
|
|
impl->Map(virtual_offset + virtual_base_offset, host_offset, length);
|
|
}
|
|
|
|
void HostMemory::Unmap(size_t virtual_offset, size_t length) {
|
|
ASSERT(virtual_offset % PageAlignment == 0);
|
|
ASSERT(length % PageAlignment == 0);
|
|
ASSERT(virtual_offset + length <= virtual_size);
|
|
if (length == 0 || !virtual_base || !impl) {
|
|
return;
|
|
}
|
|
impl->Unmap(virtual_offset + virtual_base_offset, length);
|
|
}
|
|
|
|
void HostMemory::Protect(size_t virtual_offset, size_t length, bool read, bool write) {
|
|
ASSERT(virtual_offset % PageAlignment == 0);
|
|
ASSERT(length % PageAlignment == 0);
|
|
ASSERT(virtual_offset + length <= virtual_size);
|
|
if (length == 0 || !virtual_base || !impl) {
|
|
return;
|
|
}
|
|
impl->Protect(virtual_offset + virtual_base_offset, length, read, write);
|
|
}
|
|
|
|
} // namespace Common
|