/* Copyright (c) 2008 - 2021 Advanced Micro Devices, Inc.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE. */

#ifndef KERNEL_HPP_
#define KERNEL_HPP_

#include "top.hpp"
#include "platform/object.hpp"

#include "amdocl/cl_kernel.h"

#include <vector>
#include <cstdlib>  // for malloc
#include <string>
#include "device/device.hpp"

enum FGSStatus {
  FGS_DEFAULT,  //!< The default kernel fine-grained system pointer support
  FGS_NO,       //!< no support of kernel fine-grained system pointer
  FGS_YES       //!< have support of kernel fine-grained system pointer
};

namespace amd {

class Symbol;
class Program;

/*! \addtogroup Runtime
 *  @{
 *
 *  \addtogroup Program Programs and Kernel functions
 *  @{
 */

class KernelSignature : public HeapObject {
 private:
  std::vector<KernelParameterDescriptor> params_;
  std::string attributes_;  //!< The kernel attributes

  uint32_t  numParameters_; //!< Number of OCL arguments in the kernel
  uint32_t  paramsSize_;    //!< The size of all arguments
  uint32_t  numMemories_;   //!< The number of memory objects used in the kernel
  uint32_t  numSamplers_;   //!< The number of sampler objects used in the kernel
  uint32_t  numQueues_;     //!< The number of queue objects used in the kernel
  uint32_t  version_;       //!< The ABI version

 public:
  enum {
    ABIVersion_0 = 0,   //! ABI constructed based on the OCL semantics
    ABIVersion_1 = 1,   //! ABI constructed based on the HW ABI returned from HSAIL
    ABIVersion_2 = 2    //! ABI constructed based on the HW ABI returned from LC
  };

  //! Default constructor
  KernelSignature():
    numParameters_(0), paramsSize_(0), numMemories_(0), numSamplers_(0),
    numQueues_(0), version_(ABIVersion_0) {}

  //! Construct a new signature.
  KernelSignature(const std::vector<KernelParameterDescriptor>& params,
    const std::string& attrib,
    uint32_t numParameters,
    uint32_t version);

  //! Return the number of parameters
  uint32_t numParameters() const { return numParameters_; }

  //! Return the total number of parameters, including hidden
  uint32_t numParametersAll() const { return params_.size(); }

  //! Return the parameter descriptor at the given index.
  const KernelParameterDescriptor& at(size_t index) const {
    assert(index < params_.size() && "index is out of bounds");
    return params_[index];
  }

  std::vector<KernelParameterDescriptor>& params() { return params_; }

  //! Return the size in bytes required for the arguments on the stack.
  uint32_t paramsSize() const { return paramsSize_; }

  //! Returns the number of memory objects.
  uint32_t numMemories() const { return numMemories_; }

  //! Returns the number of sampler objects.
  uint32_t numSamplers() const { return numSamplers_; }

  //! Returns the number of queue objects.
  uint32_t numQueues() const { return numQueues_; }

  //! Returns the signature version
  uint32_t version() const { return version_; }

  //! Return the kernel attributes
  const std::string& attributes() const { return attributes_; }

  const std::vector<KernelParameterDescriptor>& parameters() const
    { return params_; }
};

// @todo: look into a copy-on-write model instead of copy-on-read.
//
class KernelParameters : protected HeapObject {
 private:
  //! The signature describing these parameters.
  KernelSignature& signature_;

  address values_;                      //!< pointer to the base of the values stack.
  uint32_t execInfoOffset_;             //!< The offset of execInfo
  std::vector<void*> execSvmPtr_;       //!< The non argument svm pointers for kernel
  FGSStatus svmSystemPointersSupport_;  //!< The flag for the status of the kernel
                                        //   support of fine-grain system sharing.
  uint32_t  memoryObjOffset_;       //!< The number of memory objects
  uint32_t  samplerObjOffset_;      //!< The number of sampler objects
  uint32_t  queueObjOffset_;        //!< The number of queue objects
  amd::Memory** memoryObjects_;     //!< Memory objects, associated with the kernel
  amd::Sampler** samplerObjects_;   //!< Sampler objects, associated with the kernel
  amd::DeviceQueue** queueObjects_; //!< Queue objects, associated with the kernel

  uint32_t  totalSize_;             //!< The total size of all captured parameters

  struct {
    uint32_t validated_ : 1;        //!< True if all parameters are defined.
    uint32_t execNewVcop_ : 1;      //!< special new VCOP for kernel execution
    uint32_t execPfpaVcop_ : 1;     //!< special PFPA VCOP for kernel execution
    uint32_t deviceKernelArgs_:1;   //!< Kernel arguments allocated on device
    uint32_t unused : 28;           //!< unused
  };

 public:
  //! Construct a new instance of parameters for the given signature.
  KernelParameters(KernelSignature& signature)
      : signature_(signature),
        execInfoOffset_(0),
        svmSystemPointersSupport_(FGS_DEFAULT),
        memoryObjects_(nullptr),
        samplerObjects_(nullptr),
        queueObjects_(nullptr),
        validated_(0),
        execNewVcop_(0),
        execPfpaVcop_(0),
        deviceKernelArgs_(false) {
    totalSize_ = signature.paramsSize() + (signature.numMemories() +
        signature.numSamplers() + signature.numQueues()) * sizeof(void*);
    values_ = reinterpret_cast<address>(this) + alignUp(sizeof(KernelParameters), 16);
    memoryObjOffset_ = signature_.paramsSize();
    memoryObjects_ = reinterpret_cast<amd::Memory**>(values_ + memoryObjOffset_);
    samplerObjOffset_ = memoryObjOffset_ + signature_.numMemories() * sizeof(amd::Memory*);
    samplerObjects_ = reinterpret_cast<amd::Sampler**>(values_ + samplerObjOffset_);
    queueObjOffset_ = samplerObjOffset_ + signature_.numSamplers() * sizeof(amd::Sampler*);
    queueObjects_ = reinterpret_cast<amd::DeviceQueue**>(values_ + queueObjOffset_);
    address limit = reinterpret_cast<address>(&queueObjects_[signature_.numQueues()]);
    ::memset(values_, '\0', limit - values_);
  }

  explicit KernelParameters(const KernelParameters& rhs)
      : signature_(rhs.signature_),
        execInfoOffset_(rhs.execInfoOffset_),
        execSvmPtr_(rhs.execSvmPtr_),
        svmSystemPointersSupport_(rhs.svmSystemPointersSupport_),
        memoryObjects_(nullptr),
        samplerObjects_(nullptr),
        queueObjects_(nullptr),
        totalSize_(rhs.totalSize_),
        validated_(rhs.validated_),
        execNewVcop_(rhs.execNewVcop_),
        execPfpaVcop_(rhs.execPfpaVcop_),
        deviceKernelArgs_(false) {
    values_ = reinterpret_cast<address>(this) + alignUp(sizeof(KernelParameters), 16);
    memoryObjOffset_ = signature_.paramsSize();
    memoryObjects_ = reinterpret_cast<amd::Memory**>(values_ + memoryObjOffset_);
    samplerObjOffset_ = memoryObjOffset_ + signature_.numMemories() * sizeof(amd::Memory*);
    samplerObjects_ = reinterpret_cast<amd::Sampler**>(values_ + samplerObjOffset_);
    queueObjOffset_ = samplerObjOffset_ + signature_.numSamplers() * sizeof(amd::Sampler*);
    queueObjects_ = reinterpret_cast<amd::DeviceQueue**>(values_ + queueObjOffset_);
    address limit = reinterpret_cast<address>(&queueObjects_[signature_.numQueues()]);
    ::memcpy(values_, rhs.values_, limit - values_);
  }

  //! Reset the parameter at the given \a index (becomes undefined).
  void reset(size_t index) {
    signature_.params()[index].info_.defined_ = false;
    validated_ = 0;
  }
  //! Set the parameter at the given \a index to the value pointed by \a value
  // \a svmBound indicates that \a value is a SVM pointer.
  void set(size_t index, size_t size, const void* value, bool svmBound = false);

  //! Return true if the parameter at the given \a index is defined.
  bool test(size_t index) const { return signature_.at(index).info_.defined_; }

  //! Return true if all the parameters have been defined.
  bool check();

  //! The amount of memory required for local memory needed
  size_t localMemSize(size_t minDataTypeAlignment) const;

  //! Capture the state of the parameters and return the stack base pointer.
  address capture(device::VirtualDevice& vDev, uint64_t lclMemSize, int32_t* error);
  //! Release the captured state of the parameters.
  void release(address parameters, const amd::Device& device) const;

  //! Allocate memory for this instance as well as the required storage for
  //  the values_, defined_, and rawPointer_ arrays.
  void* operator new(size_t size, const KernelSignature& signature) {
    size_t requiredSize = alignUp(size, 16) + signature.paramsSize() +
      (signature.numMemories() + signature.numSamplers() + signature.numQueues()) *
       sizeof(void*);
    return AlignedMemory::allocate(requiredSize, PARAMETERS_MIN_ALIGNMENT);
  }
  //! Deallocate the memory reserved for this instance.
  void operator delete(void* ptr) { AlignedMemory::deallocate(ptr); }

  //! Deallocate the memory reserved for this instance,
  // matching overloaded operator new.
  void operator delete(void* ptr, const KernelSignature& signature) {
    AlignedMemory::deallocate(ptr);
  }

  //! Returns raw kernel parameters without capture
  address values() const { return values_; }

  //! Return true if the captured parameter at the given \a index is bound to
  // SVM pointer.
  bool boundToSvmPointer(const Device& device, const_address capturedAddress, size_t index) const;
  //! add the svmPtr execInfo into container
  void addSvmPtr(void* const* execInfoArray, size_t count) {
    execSvmPtr_.clear();
    for (size_t i = 0; i < count; i++) {
      execSvmPtr_.push_back(execInfoArray[i]);
    }
  }
  //! get the number of svmPtr in the execInfo container
  size_t getNumberOfSvmPtr() const { return execSvmPtr_.size(); }

  //! get the offset of svmPtr in the parameters
  uint32_t getExecInfoOffset() const { return execInfoOffset_; }

  //! get the offset of memory objects in the parameters
  uint32_t memoryObjOffset() const { return memoryObjOffset_; }

  //! get the offset of sampler objects in the parameters
  uint32_t samplerObjOffset() const { return samplerObjOffset_; }

  //! get the offset of memory objects in the parameters
  uint32_t queueObjOffset() const { return queueObjOffset_; }

  //! set the status of kernel support fine-grained SVM system pointer sharing
  void setSvmSystemPointersSupport(FGSStatus svmSystemSupport) {
    svmSystemPointersSupport_ = svmSystemSupport;
  }

  //! return the status of kernel support fine-grained SVM system pointer sharing
  FGSStatus getSvmSystemPointersSupport() const { return svmSystemPointersSupport_; }

  //! set the new VCOP in the execInfo container
  void setExecNewVcop(const bool newVcop) { execNewVcop_ = (newVcop == true); }

  //! set the PFPA VCOP in the execInfo container
  void setExecPfpaVcop(const bool pfpaVcop) { execPfpaVcop_ = (pfpaVcop == true); }

  //! get the new VCOP in the execInfo container
  bool getExecNewVcop() const { return (execNewVcop_ == 1); }

  //! get the PFPA VCOP in the execInfo container
  bool getExecPfpaVcop() const { return (execPfpaVcop_ == 1); }

  //! Returns true if arguemnts were allocated on device
  bool deviceKernelArgs() const { return (deviceKernelArgs_ == 1); }
};

/*! \brief Encapsulates a __kernel function and the argument values
 *  to be used when invoking this function.
 */
class Kernel : public RuntimeObject {
 private:
  //! The program where this kernel is defined.
  SharedReference<Program> program_;

  const Symbol& symbol_;          //!< The symbol for this kernel.
  std::string name_;              //!< The kernel's name.
  KernelParameters* parameters_;  //!< The parameters.

 protected:
  //! Destroy this kernel
  ~Kernel();

 public:
  /*! \brief Construct a kernel object from the __kernel function
   *  \a kernelName in the given \a program.
   */
  Kernel(Program& program, const Symbol& symbol, const std::string& name);

  //! Construct a new kernel object from an existing one. Used by CloneKernel.
  explicit Kernel(const Kernel& rhs);

  //! Return the program containing this kernel.
  Program& program() const { return program_(); }

  //! Return this kernel's signature.
  const KernelSignature& signature() const;

  //! Return the kernel entry point for the given device.
  const device::Kernel* getDeviceKernel(const Device& device  //!< Device object
                                        ) const;

  //! Return the parameters.
  KernelParameters& parameters() const { return *parameters_; }

  //! Return the kernel's name.
  const std::string& name() const { return name_; }

  virtual ObjectType objectType() const { return ObjectTypeKernel; }
};

/*! @}
 *  @}
 */

}  // namespace amd

#endif /*KERNEL_HPP_*/