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/*
* Copyright (C) 2017-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/os_interface/linux/os_time_linux.h"
#include "shared/source/os_interface/linux/drm_neo.h"
#include "shared/source/os_interface/linux/os_interface.h"
#include "drm/i915_drm.h"
#include <time.h>
namespace NEO {
OSTimeLinux::OSTimeLinux(OSInterface *osInterface) {
this->osInterface = osInterface;
resolutionFunc = &clock_getres;
getTimeFunc = &clock_gettime;
if (osInterface) {
pDrm = osInterface->get()->getDrm();
}
timestampTypeDetect();
}
OSTimeLinux::~OSTimeLinux(){};
void OSTimeLinux::timestampTypeDetect() {
struct drm_i915_reg_read reg = {};
int err;
if (pDrm == nullptr)
return;
reg.offset = (TIMESTAMP_LOW_REG | 1);
err = pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®);
if (err) {
reg.offset = TIMESTAMP_HIGH_REG;
err = pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®);
if (err) {
getGpuTime = &OSTimeLinux::getGpuTime32;
timestampSizeInBits = OCLRT_NUM_TIMESTAMP_BITS_FALLBACK;
} else {
getGpuTime = &OSTimeLinux::getGpuTimeSplitted;
timestampSizeInBits = OCLRT_NUM_TIMESTAMP_BITS;
}
} else {
getGpuTime = &OSTimeLinux::getGpuTime36;
timestampSizeInBits = OCLRT_NUM_TIMESTAMP_BITS;
}
}
bool OSTimeLinux::getCpuTime(uint64_t *timestamp) {
struct timespec ts;
if (getTimeFunc(CLOCK_MONOTONIC_RAW, &ts)) {
return false;
}
*timestamp = (uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
return true;
}
bool OSTimeLinux::getGpuTime32(uint64_t *timestamp) {
struct drm_i915_reg_read reg = {};
reg.offset = TIMESTAMP_LOW_REG;
if (pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®)) {
return false;
}
*timestamp = reg.val >> 32;
return true;
}
bool OSTimeLinux::getGpuTime36(uint64_t *timestamp) {
struct drm_i915_reg_read reg = {};
reg.offset = TIMESTAMP_LOW_REG | 1;
if (pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®)) {
return false;
}
*timestamp = reg.val;
return true;
}
bool OSTimeLinux::getGpuTimeSplitted(uint64_t *timestamp) {
struct drm_i915_reg_read reg_hi = {};
struct drm_i915_reg_read reg_lo = {};
uint64_t tmp_hi;
int err = 0, loop = 3;
reg_hi.offset = TIMESTAMP_HIGH_REG;
reg_lo.offset = TIMESTAMP_LOW_REG;
err += pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®_hi);
do {
tmp_hi = reg_hi.val;
err += pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®_lo);
err += pDrm->ioctl(DRM_IOCTL_I915_REG_READ, ®_hi);
} while (err == 0 && reg_hi.val != tmp_hi && --loop);
if (err) {
return false;
}
*timestamp = reg_lo.val | (reg_hi.val << 32);
return true;
}
bool OSTimeLinux::getCpuGpuTime(TimeStampData *pGpuCpuTime) {
if (nullptr == this->getGpuTime) {
return false;
}
if (!(this->*getGpuTime)(&pGpuCpuTime->GPUTimeStamp)) {
return false;
}
if (!getCpuTime(&pGpuCpuTime->CPUTimeinNS)) {
return false;
}
return true;
}
std::unique_ptr<OSTime> OSTime::create(OSInterface *osInterface) {
return std::unique_ptr<OSTime>(new OSTimeLinux(osInterface));
}
double OSTimeLinux::getHostTimerResolution() const {
struct timespec ts;
if (resolutionFunc(CLOCK_MONOTONIC_RAW, &ts)) {
return 0;
}
return static_cast<double>(ts.tv_nsec + ts.tv_sec * NSEC_PER_SEC);
}
double OSTimeLinux::getDynamicDeviceTimerResolution(HardwareInfo const &hwInfo) const {
if (pDrm) {
drm_i915_getparam_t getParam = {};
int frequency = 0;
getParam.param = I915_PARAM_CS_TIMESTAMP_FREQUENCY;
getParam.value = &frequency;
auto error = pDrm->ioctl(DRM_IOCTL_I915_GETPARAM, &getParam);
if (!error) {
return 1000000000.0 / frequency;
}
}
return OSTime::getDeviceTimerResolution(hwInfo);
}
uint64_t OSTimeLinux::getCpuRawTimestamp() {
uint64_t timesInNsec = 0;
uint64_t ticksInNsec = 0;
if (!getCpuTime(×InNsec)) {
return 0;
}
ticksInNsec = static_cast<uint64_t>(getHostTimerResolution());
if (ticksInNsec == 0) {
return 0;
}
return timesInNsec / ticksInNsec;
}
} // namespace NEO
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