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/*
* Copyright (C) 2019-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "opencl/source/tracing/tracing_api.h"
#include "opencl/source/tracing/tracing_handle.h"
#include "opencl/source/tracing/tracing_notify.h"
namespace HostSideTracing {
// [XYZZ..Z] - { X - enabled/disabled bit, Y - locked/unlocked bit, ZZ..Z - client count bits }
std::atomic<uint32_t> tracingState(0);
TracingHandle *tracingHandle[TRACING_MAX_HANDLE_COUNT] = {nullptr};
std::atomic<uint32_t> tracingCorrelationId(0);
bool addTracingClient() {
uint32_t state = tracingState.load(std::memory_order_acquire);
state = TRACING_SET_ENABLED_BIT(state);
state = TRACING_UNSET_LOCKED_BIT(state);
AtomicBackoff backoff;
while (!tracingState.compare_exchange_weak(state, state + 1, std::memory_order_release,
std::memory_order_acquire)) {
if (!TRACING_GET_ENABLED_BIT(state)) {
return false;
} else if (TRACING_GET_LOCKED_BIT(state)) {
DEBUG_BREAK_IF(TRACING_GET_CLIENT_COUNTER(state) != 0);
state = TRACING_UNSET_LOCKED_BIT(state);
backoff.pause();
} else {
backoff.pause();
}
}
return true;
}
void removeTracingClient() {
DEBUG_BREAK_IF(!TRACING_GET_ENABLED_BIT(tracingState.load(std::memory_order_acquire)));
DEBUG_BREAK_IF(TRACING_GET_LOCKED_BIT(tracingState.load(std::memory_order_acquire)));
DEBUG_BREAK_IF(TRACING_GET_CLIENT_COUNTER(tracingState.load(std::memory_order_acquire)) == 0);
tracingState.fetch_sub(1, std::memory_order_acq_rel);
}
static void LockTracingState() {
uint32_t state = tracingState.load(std::memory_order_acquire);
state = TRACING_ZERO_CLIENT_COUNTER(state);
state = TRACING_UNSET_LOCKED_BIT(state);
AtomicBackoff backoff;
while (!tracingState.compare_exchange_weak(state, TRACING_SET_LOCKED_BIT(state),
std::memory_order_release, std::memory_order_acquire)) {
state = TRACING_ZERO_CLIENT_COUNTER(state);
state = TRACING_UNSET_LOCKED_BIT(state);
backoff.pause();
}
DEBUG_BREAK_IF(!TRACING_GET_LOCKED_BIT(tracingState.load(std::memory_order_acquire)));
DEBUG_BREAK_IF(TRACING_GET_CLIENT_COUNTER(tracingState.load(std::memory_order_acquire)) > 0);
}
static void UnlockTracingState() {
DEBUG_BREAK_IF(!TRACING_GET_LOCKED_BIT(tracingState.load(std::memory_order_acquire)));
DEBUG_BREAK_IF(TRACING_GET_CLIENT_COUNTER(tracingState.load(std::memory_order_acquire)) > 0);
tracingState.fetch_and(~TRACING_STATE_LOCKED_BIT, std::memory_order_acq_rel);
}
} // namespace HostSideTracing
using namespace HostSideTracing;
cl_int CL_API_CALL clCreateTracingHandleINTEL(cl_device_id device, cl_tracing_callback callback, void *userData, cl_tracing_handle *handle) {
if (device == nullptr || callback == nullptr || handle == nullptr) {
return CL_INVALID_VALUE;
}
*handle = new _cl_tracing_handle;
if (*handle == nullptr) {
return CL_OUT_OF_HOST_MEMORY;
}
(*handle)->device = device;
(*handle)->handle = new TracingHandle(callback, userData);
if ((*handle)->handle == nullptr) {
delete *handle;
return CL_OUT_OF_HOST_MEMORY;
}
return CL_SUCCESS;
}
cl_int CL_API_CALL clSetTracingPointINTEL(cl_tracing_handle handle, cl_function_id fid, cl_bool enable) {
if (handle == nullptr) {
return CL_INVALID_VALUE;
}
DEBUG_BREAK_IF(handle->handle == nullptr);
if (static_cast<uint32_t>(fid) >= CL_FUNCTION_COUNT) {
return CL_INVALID_VALUE;
}
handle->handle->setTracingPoint(fid, enable);
return CL_SUCCESS;
}
cl_int CL_API_CALL clDestroyTracingHandleINTEL(cl_tracing_handle handle) {
if (handle == nullptr) {
return CL_INVALID_VALUE;
}
DEBUG_BREAK_IF(handle->handle == nullptr);
delete handle->handle;
delete handle;
return CL_SUCCESS;
}
cl_int CL_API_CALL clEnableTracingINTEL(cl_tracing_handle handle) {
if (handle == nullptr) {
return CL_INVALID_VALUE;
}
LockTracingState();
size_t i = 0;
DEBUG_BREAK_IF(handle->handle == nullptr);
while (i < TRACING_MAX_HANDLE_COUNT && tracingHandle[i] != nullptr) {
if (tracingHandle[i] == handle->handle) {
UnlockTracingState();
return CL_INVALID_VALUE;
}
++i;
}
if (i == TRACING_MAX_HANDLE_COUNT) {
UnlockTracingState();
return CL_OUT_OF_RESOURCES;
}
DEBUG_BREAK_IF(tracingHandle[i] != nullptr);
tracingHandle[i] = handle->handle;
if (i == 0) {
tracingState.fetch_or(TRACING_STATE_ENABLED_BIT, std::memory_order_acq_rel);
}
UnlockTracingState();
return CL_SUCCESS;
}
cl_int CL_API_CALL clDisableTracingINTEL(cl_tracing_handle handle) {
if (handle == nullptr) {
return CL_INVALID_VALUE;
}
LockTracingState();
size_t size = 0;
while (size < TRACING_MAX_HANDLE_COUNT && tracingHandle[size] != nullptr) {
++size;
}
size_t i = 0;
DEBUG_BREAK_IF(handle->handle == nullptr);
while (i < TRACING_MAX_HANDLE_COUNT && tracingHandle[i] != nullptr) {
if (tracingHandle[i] == handle->handle) {
if (size == 1) {
DEBUG_BREAK_IF(i != 0);
tracingState.fetch_and(~TRACING_STATE_ENABLED_BIT, std::memory_order_acq_rel);
tracingHandle[i] = nullptr;
} else {
tracingHandle[i] = tracingHandle[size - 1];
tracingHandle[size - 1] = nullptr;
}
UnlockTracingState();
return CL_SUCCESS;
}
++i;
}
UnlockTracingState();
return CL_INVALID_VALUE;
}
cl_int CL_API_CALL clGetTracingStateINTEL(cl_tracing_handle handle, cl_bool *enable) {
if (handle == nullptr || enable == nullptr) {
return CL_INVALID_VALUE;
}
LockTracingState();
*enable = CL_FALSE;
size_t i = 0;
DEBUG_BREAK_IF(handle->handle == nullptr);
while (i < TRACING_MAX_HANDLE_COUNT && tracingHandle[i] != nullptr) {
if (tracingHandle[i] == handle->handle) {
*enable = CL_TRUE;
break;
}
++i;
}
UnlockTracingState();
return CL_SUCCESS;
}
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