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/*
* Copyright (C) 2025-2026 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#pragma once
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <deque>
#include <functional>
#include <mutex>
#include <unordered_map>
namespace NEO {
class LinearStream;
class CommandStreamReceiver;
class IHostFunction;
class GraphicsAllocation;
struct RootDeviceEnvironment;
struct HostFunction {
uint64_t hostFunctionAddress = 0;
uint64_t userDataAddress = 0;
void invoke() const {
using CallbackT = void (*)(void *);
CallbackT callback = reinterpret_cast<CallbackT>(hostFunctionAddress);
void *callbackData = reinterpret_cast<void *>(userDataAddress);
callback(callbackData);
}
};
namespace HostFunctionStatus {
inline constexpr uint64_t completed = 0;
} // namespace HostFunctionStatus
namespace HostFunctionThreadPoolHelper {
inline constexpr int32_t unlimitedThreads = -1; // each CSR that uses host function creates worker thread in thread pool
}
class HostFunctionStreamer {
public:
HostFunctionStreamer(CommandStreamReceiver *csr,
GraphicsAllocation *allocation,
void *hostFunctionIdAddress,
const std::function<void(GraphicsAllocation &)> &downloadAllocationImpl,
uint32_t activePartition,
uint32_t partitionOffset,
bool isTbx,
bool dcFlushRequired);
~HostFunctionStreamer() = default;
uint64_t getHostFunctionReadyToExecute() const;
GraphicsAllocation *getHostFunctionIdAllocation() const;
HostFunction getHostFunction(uint64_t hostFunctionId);
uint64_t getHostFunctionId(uint32_t partitionId) const;
uint64_t getHostFunctionIdGpuAddress(uint32_t partitionId) const;
uint64_t *getHostFunctionIdPtr(uint32_t partitionId) const;
uint64_t getNextHostFunctionIdAndIncrement();
void addHostFunction(uint64_t hostFunctionId, HostFunction &&hostFunction);
void downloadHostFunctionAllocation() const;
void signalHostFunctionCompletion(const HostFunction &hostFunction);
void prepareForExecution(const HostFunction &hostFunction);
uint32_t getActivePartitions() const;
bool getDcFlushRequired() const;
private:
void updateTbxData();
void setHostFunctionIdAsCompleted();
void startInOrderExecution();
void endInOrderExecution();
bool isInOrderExecutionInProgress() const;
std::mutex hostFunctionsMutex;
std::unordered_map<uint64_t, HostFunction> hostFunctions;
uint64_t *hostFunctionIdAddress = nullptr; // 0 bit - used to signal that host function is pending or completed
CommandStreamReceiver *csr = nullptr;
GraphicsAllocation *allocation = nullptr;
std::function<void(GraphicsAllocation &)> downloadAllocationImpl;
std::atomic<uint64_t> nextHostFunctionId{1};
std::atomic<uint32_t> pendingHostFunctions{0};
uint32_t activePartitions{1};
uint32_t partitionOffset{0};
std::atomic<bool> inOrderExecutionInProgress{false};
const bool isTbx = false;
bool dcFlushRequired = false;
};
enum class HostFunctionWorkerMode : int32_t {
defaultMode = -1,
countingSemaphore = 0,
schedulerWithThreadPool = 1,
};
template <typename GfxFamily>
struct HostFunctionHelper {
static void programHostFunction(LinearStream &commandStream, HostFunctionStreamer &streamer, HostFunction &&hostFunction, bool isMemorySynchronizationRequired);
static void programHostFunctionId(LinearStream *commandStream, void *cmdBuffer, HostFunctionStreamer &streamer, HostFunction &&hostFunction, bool isMemorySynchronizationRequired);
static void programHostFunctionWaitForCompletion(LinearStream *commandStream, void *cmdBuffer, const HostFunctionStreamer &streamer, uint32_t partionId);
};
namespace HostFunctionFactory {
void createAndSetHostFunctionWorker(HostFunctionWorkerMode hostFunctionWorkerMode,
bool skipHostFunctionExecution,
CommandStreamReceiver *csr,
RootDeviceEnvironment *rootDeviceEnvironment);
} // namespace HostFunctionFactory
} // namespace NEO
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