common/host_memory: Add interface and Windows implementation
This commit is contained in:
ReinUsesLisp
Markus Wick
parent
fbb170857f
commit
a7837a3791
3 changed files with 384 additions and 0 deletions
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@ -131,6 +131,8 @@ add_library(common STATIC
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hash.h
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hex_util.cpp
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hex_util.h
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host_memory.cpp
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host_memory.h
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intrusive_red_black_tree.h
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logging/backend.cpp
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logging/backend.h
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320
src/common/host_memory.cpp
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320
src/common/host_memory.cpp
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@ -0,0 +1,320 @@
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#ifdef __linux__
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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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#elif defined(_WIN32) // ^^^ Linux ^^^ vvv Windows vvv
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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#define _WIN32_WINNT 0x0A00 // Windows 10
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#include <windows.h>
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#include <boost/icl/separate_interval_set.hpp>
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#include <iterator>
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#include <unordered_map>
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#pragma comment(lib, "mincore.lib")
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#endif // ^^^ Windows ^^^
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#include <mutex>
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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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namespace Common {
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constexpr size_t PageAlignment = 0x1000;
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#ifdef _WIN32
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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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// Allocate backing file map
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backing_handle =
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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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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*>(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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throw std::bad_alloc{};
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}
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// Map backing placeholder
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void* const ret = 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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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*>(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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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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DWORD old_flags{};
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if (!VirtualProtect(virtual_base + virtual_offset, 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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}
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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 (!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 (!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 (!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 (!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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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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#else
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#error Please implement the host memory for your platform
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#endif
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HostMemory::HostMemory(size_t backing_size, size_t virtual_size)
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: impl{std::make_unique<HostMemory::Impl>(backing_size, virtual_size)},
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backing_base{impl->backing_base}, virtual_base{impl->virtual_base} {}
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HostMemory::~HostMemory() = default;
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HostMemory::HostMemory(HostMemory&&) noexcept = default;
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HostMemory& HostMemory::operator=(HostMemory&&) noexcept = default;
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void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length) {
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ASSERT(virtual_offset % PageAlignment == 0);
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ASSERT(host_offset % PageAlignment == 0);
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ASSERT(length % PageAlignment == 0);
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ASSERT(virtual_offset + length <= impl->virtual_size);
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ASSERT(host_offset + length <= impl->backing_size);
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if (length == 0) {
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return;
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}
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impl->Map(virtual_offset, host_offset, length);
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}
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void HostMemory::Unmap(size_t virtual_offset, size_t length) {
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ASSERT(virtual_offset % PageAlignment == 0);
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ASSERT(length % PageAlignment == 0);
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ASSERT(virtual_offset + length <= impl->virtual_size);
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if (length == 0) {
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return;
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}
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impl->Unmap(virtual_offset, length);
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}
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void HostMemory::Protect(size_t virtual_offset, size_t length, bool read, bool write) {
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ASSERT(virtual_offset % PageAlignment == 0);
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ASSERT(length % PageAlignment == 0);
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ASSERT(virtual_offset + length <= impl->virtual_size);
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if (length == 0) {
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return;
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}
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impl->Protect(virtual_offset, length, read, write);
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}
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} // namespace Common
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62
src/common/host_memory.h
Normal file
62
src/common/host_memory.h
Normal file
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@ -0,0 +1,62 @@
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// Copyright 2019 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include "common/common_types.h"
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namespace Common {
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/**
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* A low level linear memory buffer, which supports multiple mappings
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* Its purpose is to rebuild a given sparse memory layout, including mirrors.
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*/
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class HostMemory {
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public:
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explicit HostMemory(size_t backing_size, size_t virtual_size);
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~HostMemory();
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/**
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* Copy constructors. They shall return a copy of the buffer without the mappings.
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* TODO: Implement them with COW if needed.
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*/
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HostMemory(const HostMemory& other) = delete;
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HostMemory& operator=(const HostMemory& other) = delete;
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/**
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* Move constructors. They will move the buffer and the mappings to the new object.
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*/
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HostMemory(HostMemory&& other) noexcept;
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HostMemory& operator=(HostMemory&& other) noexcept;
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void Map(size_t virtual_offset, size_t host_offset, size_t length);
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void Unmap(size_t virtual_offset, size_t length);
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void Protect(size_t virtual_offset, size_t length, bool read, bool write);
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[[nodiscard]] u8* BackingBasePointer() noexcept {
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return backing_base;
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}
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[[nodiscard]] const u8* BackingBasePointer() const noexcept {
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return backing_base;
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}
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[[nodiscard]] u8* VirtualBasePointer() noexcept {
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return virtual_base;
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}
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[[nodiscard]] const u8* VirtualBasePointer() const noexcept {
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return virtual_base;
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}
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private:
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// Low level handler for the platform dependent memory routines
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class Impl;
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std::unique_ptr<Impl> impl;
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u8* backing_base{};
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u8* virtual_base{};
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};
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} // namespace Common
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