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https://github.com/FEX-Emu/FEX.git
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Ryan Houdek
dcebe85f3a
This is a little trickier, we actually open the `/dev/shm/fex-<pid>-stats` file directly using Windows APIs that way Mangohud (which is going to be on the Linux side, or potentially even embedded in to Gamescope) can safely pick up the stats. A little quirky plus doesn't support expanding its size since WINE doesn't support NtExtendSection, but that's fine.
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
// SPDX-License-Identifier: MIT
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#include "Windows/Common/Profiler.h"
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#include <FEXCore/fextl/fmt.h>
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#include <FEXCore/Utils/LogManager.h>
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#include <ntstatus.h>
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#include <windef.h>
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#include <winternl.h>
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#include <winnt.h>
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#include <wine/debug.h>
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namespace FEX::Windows {
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__attribute__((naked)) uint64_t linux_getpid() {
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asm volatile(R"(
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mov x8, 172;
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svc #0;
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ret;
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)" ::
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: "r0", "r8");
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}
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uint64_t StatAlloc::AllocateMoreSlots(uint64_t NewSize) {
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LogMan::Msg::DFmt("Ran out of slots. Can't allocate more");
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return CurrentSize;
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}
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StatAlloc::StatAlloc(FEXCore::Profiler::AppType AppType) {
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CurrentSize = MAX_STATS_SIZE;
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auto handle = CreateFile(fextl::fmt::format("/dev/shm/fex-{}-stats", linux_getpid()).c_str(), GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ, nullptr, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
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// Create the section mapping for the file handle for the full size.
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HANDLE SectionMapping;
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LARGE_INTEGER SectionSize {{MAX_STATS_SIZE}};
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auto Result = NtCreateSection(&SectionMapping, SECTION_EXTEND_SIZE | SECTION_MAP_READ | SECTION_MAP_WRITE, nullptr, &SectionSize,
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PAGE_READWRITE, SEC_COMMIT, handle);
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if (Result != 0) {
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CloseHandle(handle);
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return;
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}
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// Section mapping is used from now on.
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CloseHandle(handle);
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// Now actually map the view of the section.
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Base = 0;
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size_t FullSize = MAX_STATS_SIZE;
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Result = NtMapViewOfSection(SectionMapping, NtCurrentProcess(), &Base, 0, 0, nullptr, &FullSize, ViewUnmap, MEM_RESERVE | MEM_TOP_DOWN,
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PAGE_READWRITE);
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if (Result != 0) {
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CloseHandle(SectionMapping);
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return;
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}
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// Once WINE supports NtExtendSection and SECTION_EXTEND_SIZE correctly then we can map/commit a single page, map the full MAX_STATS_SIZE
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// view as reserved, and extend the view using NtExtendSection.
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SaveHeader(AppType);
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}
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StatAlloc::~StatAlloc() {
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DeleteFile(fextl::fmt::format("/dev/shm/fex-{}-stats", linux_getpid()).c_str());
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}
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} // namespace FEX::Windows
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