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/*
* Copyright (C) 2019-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/page_fault_manager/linux/cpu_page_fault_manager_linux.h"
#include "shared/source/debug_settings/debug_settings_manager.h"
#include "shared/source/device/device.h"
#include "shared/source/helpers/debug_helpers.h"
#include "shared/source/memory_manager/memory_operations_handler.h"
#include <sys/mman.h>
namespace NEO {
std::unique_ptr<PageFaultManager> PageFaultManager::create() {
return std::make_unique<PageFaultManagerLinux>();
}
std::function<void(int signal, siginfo_t *info, void *context)> PageFaultManagerLinux::pageFaultHandler;
PageFaultManagerLinux::PageFaultManagerLinux() {
pageFaultHandler = [&](int signal, siginfo_t *info, void *context) {
if (!this->verifyPageFault(info->si_addr)) {
callPreviousHandler(signal, info, context);
}
};
struct sigaction pageFaultManagerHandler = {};
pageFaultManagerHandler.sa_flags = SA_SIGINFO;
pageFaultManagerHandler.sa_sigaction = pageFaultHandlerWrapper;
auto retVal = sigaction(SIGSEGV, &pageFaultManagerHandler, &previousPageFaultHandler);
UNRECOVERABLE_IF(retVal != 0);
this->evictMemoryAfterCopy = DebugManager.flags.EnableDirectSubmission.get() &&
DebugManager.flags.USMEvictAfterMigration.get();
}
PageFaultManagerLinux::~PageFaultManagerLinux() {
if (!previousHandlerRestored) {
auto retVal = sigaction(SIGSEGV, &previousPageFaultHandler, nullptr);
UNRECOVERABLE_IF(retVal != 0);
}
}
void PageFaultManagerLinux::pageFaultHandlerWrapper(int signal, siginfo_t *info, void *context) {
pageFaultHandler(signal, info, context);
}
void PageFaultManagerLinux::allowCPUMemoryAccess(void *ptr, size_t size) {
auto retVal = mprotect(ptr, size, PROT_READ | PROT_WRITE);
UNRECOVERABLE_IF(retVal != 0);
}
void PageFaultManagerLinux::protectCPUMemoryAccess(void *ptr, size_t size) {
auto retVal = mprotect(ptr, size, PROT_NONE);
UNRECOVERABLE_IF(retVal != 0);
}
void PageFaultManagerLinux::callPreviousHandler(int signal, siginfo_t *info, void *context) {
if (previousPageFaultHandler.sa_flags & SA_SIGINFO) {
previousPageFaultHandler.sa_sigaction(signal, info, context);
} else {
if (previousPageFaultHandler.sa_handler == SIG_DFL) {
auto retVal = sigaction(SIGSEGV, &previousPageFaultHandler, nullptr);
UNRECOVERABLE_IF(retVal != 0);
previousHandlerRestored = true;
} else if (previousPageFaultHandler.sa_handler == SIG_IGN) {
return;
} else {
previousPageFaultHandler.sa_handler(signal);
}
}
}
void PageFaultManagerLinux::evictMemoryAfterImplCopy(GraphicsAllocation *allocation, Device *device) {
if (evictMemoryAfterCopy) {
device->getRootDeviceEnvironment().memoryOperationsInterface->evict(device, *allocation);
}
};
} // namespace NEO
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