//
// Copyright (c) 2008 Advanced Micro Devices, Inc. All rights reserved.
//

/*!
 * \file command.cpp
 * \brief  Definitions for Event, Command and HostQueue objects.
 *
 * \author Laurent Morichetti (laurent.morichetti@amd.com)
 * \date   October 2008
 */

#include "platform/command.hpp"
#include "platform/commandqueue.hpp"
#include "device/device.hpp"
#include "platform/context.hpp"
#include "platform/kernel.hpp"
#include "thread/monitor.hpp"
#include "platform/memory.hpp"
#include "platform/agent.hpp"
#include "os/alloc.hpp"

#include <cstring>
#include <algorithm>

namespace amd {

Event::Event(HostQueue& queue)
    : callbacks_(NULL),
      status_(CL_INT_MAX),
      profilingInfo_(queue.properties().test(CL_QUEUE_PROFILING_ENABLE) ||
                     Agent::shouldPostEventEvents()) {
  notified_.clear();
}

Event::Event() : callbacks_(NULL), status_(CL_SUBMITTED) { notified_.clear(); }

Event::~Event() {
  CallBackEntry* callback = callbacks_;
  while (callback != NULL) {
    CallBackEntry* next = callback->next_;
    delete callback;
    callback = next;
  }
}

uint64_t Event::recordProfilingInfo(cl_int status, uint64_t timeStamp) {
  if (timeStamp == 0) {
    timeStamp = Os::timeNanos();
  }
  switch (status) {
    case CL_QUEUED:
      profilingInfo_.queued_ = timeStamp;
      break;
    case CL_SUBMITTED:
      profilingInfo_.submitted_ = timeStamp;
      break;
    case CL_RUNNING:
      profilingInfo_.start_ = timeStamp;
      break;
    default:
      profilingInfo_.end_ = timeStamp;
      if (profilingInfo_.callback_ != NULL) {
        profilingInfo_.callback_->callback(timeStamp - profilingInfo_.start_,
            profilingInfo_.waves_);
      }
      break;
  }
  return timeStamp;
}

bool Event::setStatus(cl_int status, uint64_t timeStamp) {
  assert(status <= CL_QUEUED && "invalid status");

  cl_int currentStatus = status_;
  if (currentStatus <= CL_COMPLETE || currentStatus <= status) {
    // We can only move forward in the execution status.
    return false;
  }

  if (profilingInfo().enabled_) {
    timeStamp = recordProfilingInfo(status, timeStamp);
  }

  if (!make_atomic(status_).compareAndSet(currentStatus, status)) {
    // Somebody else beat us to it, let them deal with the release/signal.
    return false;
  }

  if (callbacks_ != (CallBackEntry*)0) {
    processCallbacks(status);
  }

  if (Agent::shouldPostEventEvents() && command().type() != 0) {
    Agent::postEventStatusChanged(as_cl(this), status, timeStamp + Os::offsetToEpochNanos());
  }

  if (status <= CL_COMPLETE) {
    // Before we notify the waiters that this event reached the CL_COMPLETE
    // status, we release all the resources associated with this instance.
    releaseResources();

    // Broadcast all the waiters.
    if (referenceCount() > 1) {
      signal();
    }
    release();
  }

  return true;
}


bool Event::setCallback(cl_int status, Event::CallBackFunction callback, void* data) {
  assert(status >= CL_COMPLETE && status <= CL_QUEUED && "invalid status");

  CallBackEntry* entry = new CallBackEntry(status, callback, data);
  if (entry == NULL) {
    return false;
  }

  entry->next_ = callbacks_;
  while (!callbacks_.compare_exchange_weak(entry->next_, entry))
    ;  // Someone else is also updating the head of the linked list! reload.

  // Check if the event has already reached 'status'
  if (status_ <= status && entry->callback_ != CallBackFunction(0)) {
    if (entry->callback_.exchange(NULL) != NULL) {
      callback(as_cl(this), status, entry->data_);
    }
  }

  return true;
}


void Event::processCallbacks(cl_int status) const {
  cl_event event = const_cast<cl_event>(as_cl(this));
  const cl_int mask = (status > CL_COMPLETE) ? status : CL_COMPLETE;

  // For_each callback:
  CallBackEntry* entry;
  for (entry = callbacks_; entry != NULL; entry = entry->next_) {
    // If the entry's status matches the mask,
    if (entry->status_ == mask && entry->callback_ != CallBackFunction(0)) {
      // invoke the callback function.
      CallBackFunction callback = entry->callback_.exchange(NULL);
      if (callback != NULL) {
        callback(event, status, entry->data_);
      }
    }
  }
}

bool Event::awaitCompletion() {
  if (status_ > CL_COMPLETE) {
    // Notifies current command queue about waiting
    if (!notifyCmdQueue()) {
      return false;
    }

    ScopedLock lock(lock_);

    // Wait until the status becomes CL_COMPLETE or negative.
    while (status_ > CL_COMPLETE) {
      lock_.wait();
    }
  }

  return status_ == CL_COMPLETE;
}

bool Event::notifyCmdQueue() {
  HostQueue* queue = command().queue();
  if ((NULL != queue) && !notified_.test_and_set()) {
    // Make sure the queue is draining the enqueued commands.
    amd::Command* command = new amd::Marker(*queue, false, nullWaitList, this);
    if (command == NULL) {
      notified_.clear();
      return false;
    }
    command->enqueue();
    command->release();
  }
  return true;
}

const Event::EventWaitList Event::nullWaitList(0);

Command::Command(HostQueue& queue, cl_command_type type, const EventWaitList& eventWaitList)
    : Event(queue),
      queue_(&queue),
      next_(NULL),
      type_(type),
      exception_(0),
      data_(NULL),
      eventWaitList_(eventWaitList) {
  // Retain the commands from the event wait list.
  std::for_each(eventWaitList.begin(), eventWaitList.end(), std::mem_fun(&Command::retain));
}

void Command::releaseResources() {
  const Command::EventWaitList& events = eventWaitList();

  // Release the commands from the event wait list.
  std::for_each(events.begin(), events.end(), std::mem_fun(&Command::release));
}

void Command::enqueue() {
  assert(queue_ != NULL && "Cannot be enqueued");

  if (Agent::shouldPostEventEvents() && type_ != 0) {
    Agent::postEventCreate(as_cl(static_cast<Event*>(this)), type_);
  }

  if (IS_HIP) {
    queue_->setLastQueuedCommand(this);
  }
  queue_->append(*this);
  queue_->flush();
  if (queue_->device().settings().waitCommand_ && (type_ != 0)) {
    awaitCompletion();
  }
}

const Context& Command::context() const { return queue_->context(); }

NDRangeKernelCommand::NDRangeKernelCommand(HostQueue& queue, const EventWaitList& eventWaitList,
                                           Kernel& kernel, const NDRangeContainer& sizes, uint32_t sharedMemBytes)
    : Command(queue, CL_COMMAND_NDRANGE_KERNEL, eventWaitList), kernel_(kernel), sizes_(sizes), sharedMemBytes_(sharedMemBytes) {
  auto& device = queue.device();
  auto devKernel = const_cast<device::Kernel*>(kernel.getDeviceKernel(device));
  profilingInfo_.setCallback(devKernel->getProfilingCallback(
    queue.vdev()), devKernel->getWavesPerSH(queue.vdev()));
  kernel_.retain();
}

void NDRangeKernelCommand::releaseResources() {
  kernel_.parameters().release(parameters_, queue()->device());
  DEBUG_ONLY(parameters_ = NULL);
  kernel_.release();
  Command::releaseResources();
}

NativeFnCommand::NativeFnCommand(HostQueue& queue, const EventWaitList& eventWaitList,
                                 void(CL_CALLBACK* nativeFn)(void*), const void* args,
                                 size_t argsSize, size_t numMemObjs, const cl_mem* memObjs,
                                 const void** memLocs)
    : Command(queue, CL_COMMAND_NATIVE_KERNEL, eventWaitList),
      nativeFn_(nativeFn),
      argsSize_(argsSize) {
  args_ = new char[argsSize_];
  if (args_ == NULL) {
    return;
  }
  ::memcpy(args_, args, argsSize_);

  memObjects_.resize(numMemObjs);
  memOffsets_.resize(numMemObjs);
  for (size_t i = 0; i < numMemObjs; ++i) {
    Memory* obj = as_amd(memObjs[i]);

    obj->retain();
    memObjects_[i] = obj;
    memOffsets_[i] = (const_address)memLocs[i] - (const_address)args;
  }
}

cl_int NativeFnCommand::invoke() {
  size_t numMemObjs = memObjects_.size();
  for (size_t i = 0; i < numMemObjs; ++i) {
    void* hostMemPtr = memObjects_[i]->getHostMem();
    if (hostMemPtr == NULL) {
      return CL_MEM_OBJECT_ALLOCATION_FAILURE;
    }
    *reinterpret_cast<void**>(&args_[memOffsets_[i]]) = hostMemPtr;
  }
  nativeFn_(args_);
  return CL_SUCCESS;
}

bool OneMemoryArgCommand::validateMemory() {
  // Runtime disables deferred memory allocation for single device.
  // Hence ignore memory validations
  if (queue()->context().devices().size() == 1) {
    return true;
  }
  device::Memory* mem = memory_->getDeviceMemory(queue()->device());
  if (NULL == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory_->getSize());
    return false;
  }
  return true;
}

bool TwoMemoryArgsCommand::validateMemory() {
  // Runtime disables deferred memory allocation for single device.
  // Hence ignore memory validations
  if (queue()->context().devices().size() == 1) {
    return true;
  }
  device::Memory* mem = memory1_->getDeviceMemory(queue()->device());
  if (NULL == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory1_->getSize());
    return false;
  }
  mem = memory2_->getDeviceMemory(queue()->device());
  if (NULL == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory2_->getSize());
    return false;
  }
  return true;
}
bool ReadMemoryCommand::isEntireMemory() const {
  return source().isEntirelyCovered(origin(), size());
}

bool WriteMemoryCommand::isEntireMemory() const {
  return destination().isEntirelyCovered(origin(), size());
}

bool SvmMapMemoryCommand::isEntireMemory() const {
  return getSvmMem()->isEntirelyCovered(origin(), size());
}

bool FillMemoryCommand::isEntireMemory() const {
  return memory().isEntirelyCovered(origin(), size());
}

bool CopyMemoryCommand::isEntireMemory() const {
  bool result = false;

  switch (type()) {
    case CL_COMMAND_COPY_IMAGE_TO_BUFFER: {
      Coord3D imageSize(size()[0] * size()[1] * size()[2] *
                        source().asImage()->getImageFormat().getElementSize());
      result = source().isEntirelyCovered(srcOrigin(), size()) &&
          destination().isEntirelyCovered(dstOrigin(), imageSize);
    } break;
    case CL_COMMAND_COPY_BUFFER_TO_IMAGE: {
      Coord3D imageSize(size()[0] * size()[1] * size()[2] *
                        destination().asImage()->getImageFormat().getElementSize());
      result = source().isEntirelyCovered(srcOrigin(), imageSize) &&
          destination().isEntirelyCovered(dstOrigin(), size());
    } break;
    case CL_COMMAND_COPY_BUFFER_RECT: {
      Coord3D rectSize(size()[0] * size()[1] * size()[2]);
      Coord3D srcOffs(srcRect().start_);
      Coord3D dstOffs(dstRect().start_);
      result = source().isEntirelyCovered(srcOffs, rectSize) &&
          destination().isEntirelyCovered(dstOffs, rectSize);
    } break;
    default:
      result = source().isEntirelyCovered(srcOrigin(), size()) &&
          destination().isEntirelyCovered(dstOrigin(), size());
      break;
  }
  return result;
}

bool MapMemoryCommand::isEntireMemory() const {
  return memory().isEntirelyCovered(origin(), size());
}

void UnmapMemoryCommand::releaseResources() {
  //! @todo This is a workaround to a deadlock on indirect map release.
  //! Remove this code when CAL will have a refcounter on memory.
  //! decIndMapCount() has to go back to submitUnmapMemory()
  device::Memory* mem = memory_->getDeviceMemory(queue()->device());
  if (NULL != mem) {
    mem->releaseIndirectMap();
  }

  OneMemoryArgCommand::releaseResources();
}

bool MigrateMemObjectsCommand::validateMemory() {
  // Runtime disables deferred memory allocation for single device.
  // Hence ignore memory validations
  if (queue()->context().devices().size() == 1) {
    return true;
  }
  for (const auto& it : memObjects_) {
    device::Memory* mem = it->getDeviceMemory(queue()->device());
    if (NULL == mem) {
      LogPrintfError("Can't allocate memory size - 0x%08X bytes!", it->getSize());
      return false;
    }
  }
  return true;
}

cl_int NDRangeKernelCommand::captureAndValidate() {
  const amd::Device& device = queue()->device();
  // Validate the kernel before submission
  if (!queue()->device().validateKernel(kernel(), queue()->vdev())) {
    return CL_OUT_OF_RESOURCES;
  }

  cl_int error;
  cl_ulong lclMemSize = kernel().getDeviceKernel(device)->workGroupInfo()->localMemSize_;
  parameters_ = kernel().parameters().capture(device, lclMemSize, &error);
  return error;
}

bool ExtObjectsCommand::validateMemory() {
  // Always process GL objects, even if deferred allocations are disabled,
  // because processGLResource() calls OGL Acquire().
  bool retVal = true;
  for (const auto& it : memObjects_) {
    device::Memory* mem = it->getDeviceMemory(queue()->device());
    if (NULL == mem) {
      LogPrintfError("Can't allocate memory size - 0x%08X bytes!", it->getSize());
      return false;
    }
    retVal = processGLResource(mem);
  }
  return retVal;
}

bool AcquireExtObjectsCommand::processGLResource(device::Memory* mem) {
  return mem->processGLResource(device::Memory::GLDecompressResource);
}

bool ReleaseExtObjectsCommand::processGLResource(device::Memory* mem) {
  return mem->processGLResource(device::Memory::GLInvalidateFBO);
}

bool MakeBuffersResidentCommand::validateMemory() {
  // Runtime disables deferred memory allocation for single device.
  // Hence ignore memory validations
  if (queue()->context().devices().size() == 1) {
    return true;
  }
  for (const auto& it : memObjects_) {
    device::Memory* mem = it->getDeviceMemory(queue()->device());
    if (NULL == mem) {
      LogPrintfError("Can't allocate memory size - 0x%08X bytes!", it->getSize());
      return false;
    }
  }
  return true;
}

bool ThreadTraceMemObjectsCommand::validateMemory() {
  // Runtime disables deferred memory allocation for single device.
  // Hence ignore memory validations
  if (queue()->context().devices().size() == 1) {
    return true;
  }
  for (auto it = memObjects_.cbegin(); it != memObjects_.cend(); it++) {
    device::Memory* mem = (*it)->getDeviceMemory(queue()->device());
    if (NULL == mem) {
      for (auto tmpIt = memObjects_.cbegin(); tmpIt != it; tmpIt++) {
        device::Memory* tmpMem = (*tmpIt)->getDeviceMemory(queue()->device());
        delete tmpMem;
      }
      LogPrintfError("Can't allocate memory size - 0x%08X bytes!", (*it)->getSize());
      return false;
    }
  }
  return true;
}

void TransferBufferFileCommand::releaseResources() {
  for (uint i = 0; i < NumStagingBuffers; ++i) {
    if (NULL != staging_[i]) {
      staging_[i]->release();
    }
  }

  // Call the parent
  OneMemoryArgCommand::releaseResources();
}

void TransferBufferFileCommand::submit(device::VirtualDevice& device) {
  device::Memory* mem = memory_->getDeviceMemory(queue()->device());
  if (memory_->getMemFlags() &
      (CL_MEM_USE_HOST_PTR | CL_MEM_ALLOC_HOST_PTR | CL_MEM_USE_PERSISTENT_MEM_AMD)) {
    void* srcDstBuffer = nullptr;
    if (memory_->getMemFlags() & CL_MEM_USE_PERSISTENT_MEM_AMD) {
      // Lock protected multiple maps for persistent memory
      amd::ScopedLock lock(mem->owner()->lockMemoryOps());
      srcDstBuffer = mem->cpuMap(device);
    } else {
      srcDstBuffer = mem->cpuMap(device);
    }
    // Make HD transfer to the host accessible memory
    bool writeBuffer(type() == CL_COMMAND_READ_SSG_FILE_AMD);
    if (!file()->transferBlock(writeBuffer, srcDstBuffer, mem->size(), fileOffset(), origin()[0],
                               size()[0])) {
      setStatus(CL_INVALID_OPERATION);
      return;
    }
    if (memory_->getMemFlags() & CL_MEM_USE_PERSISTENT_MEM_AMD) {
      // Lock protected multiple maps for persistent memory
      amd::ScopedLock lock(mem->owner()->lockMemoryOps());
      mem->cpuUnmap(device);
    } else {
      mem->cpuUnmap(device);
    }
  } else {
    device.submitTransferBufferFromFile(*this);
  }
}

bool TransferBufferFileCommand::validateMemory() {
  // Check if the destination buffer has direct host access
  if (!(memory_->getMemFlags() &
        (CL_MEM_USE_HOST_PTR | CL_MEM_ALLOC_HOST_PTR | CL_MEM_USE_PERSISTENT_MEM_AMD))) {
    // Allocate staging buffers
    for (uint i = 0; i < NumStagingBuffers; ++i) {
      staging_[i] = new (memory_->getContext())
          Buffer(memory_->getContext(), StagingBufferMemType, StagingBufferSize);
      if (NULL == staging_[i] || !staging_[i]->create(nullptr)) {
        return false;
      }
      device::Memory* mem = staging_[i]->getDeviceMemory(queue()->device());
      if (NULL == mem) {
        LogPrintfError("Can't allocate staging buffer - 0x%08X bytes!", staging_[i]->getSize());
        return false;
      }
    }
  }

  device::Memory* mem = memory_->getDeviceMemory(queue()->device());
  if (NULL == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory_->getSize());
    return false;
  }
  return true;
}

bool CopyMemoryP2PCommand::validateMemory() {
  const std::vector<Device*>& devices = memory1_->getContext().devices();
  if (devices.size() != 1) {
    LogError("Can't allocate memory object for P2P extension");
    return false;
  }
  device::Memory* mem = memory1_->getDeviceMemory(*devices[0]);
  if (nullptr == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory1_->getSize());
    return false;
  }
  const std::vector<Device*>& devices2 = memory2_->getContext().devices();
  if (devices2.size() != 1) {
    LogError("Can't allocate memory object for P2P extension");
    return false;
  }
  mem = memory2_->getDeviceMemory(*devices2[0]);
  if (nullptr == mem) {
    LogPrintfError("Can't allocate memory size - 0x%08X bytes!", memory2_->getSize());
    return false;
  }
  if (devices[0]->P2PStage() != nullptr) {
    amd::ScopedLock lock(devices[0]->P2PStageOps());
    // Make sure runtime allocates memory on every device
    for (uint d = 0; d < devices[0]->GlbCtx().devices().size(); ++d) {
      device::Memory* mem = devices[0]->P2PStage()->getDeviceMemory(*devices[0]->GlbCtx().devices()[d]);
      if (nullptr == mem) {
        return false;
      }
    }
  }
  return true;
}

}  // namespace amd