//
// Copyright (c) 2010 Advanced Micro Devices, Inc. All rights reserved.
//

#ifndef WITHOUT_GPU_BACKEND

#include "top.hpp"
#include "os/os.hpp"
#include "device/device.hpp"
#include "rocsettings.hpp"
#include "device/rocm/rocglinterop.hpp"

namespace roc {

Settings::Settings() {
  // Initialize the HSA device default settings

  // Set this to true when we drop the flag
  doublePrecision_ = ::CL_KHR_FP64;

  enableLocalMemory_ = HSA_LOCAL_MEMORY_ENABLE;
  enableCoarseGrainSVM_ = HSA_ENABLE_COARSE_GRAIN_SVM;

  maxWorkGroupSize_ = 1024;
  preferredWorkGroupSize_ = 256;

  maxWorkGroupSize2DX_ = 16;
  maxWorkGroupSize2DY_ = 16;
  maxWorkGroupSize3DX_ = 4;
  maxWorkGroupSize3DY_ = 4;
  maxWorkGroupSize3DZ_ = 4;

  kernargPoolSize_ = HSA_KERNARG_POOL_SIZE;

  // Determine if user is requesting Non-Coherent mode
  // for system memory. By default system memory is
  // operates or is programmed to be in Coherent mode.
  // Users can turn it off for hardware that does not
  // support this feature naturally
  char* nonCoherentMode = nullptr;
  nonCoherentMode = getenv("OPENCL_USE_NC_MEMORY_POLICY");
  enableNCMode_ = (nonCoherentMode) ? true : false;

  commandQueues_ = 200;  //!< Field value set to maximum number
                         //!< concurrent Virtual GPUs for ROCm backend

  // Disable image DMA by default (ROCM runtime doesn't support it)
  imageDMA_ = false;

  stagedXferRead_ = true;
  stagedXferWrite_ = true;
  stagedXferSize_ = GPU_STAGING_BUFFER_SIZE * Ki;

  // Initialize transfer buffer size to 1MB by default
  xferBufSize_ = 1024 * Ki;

  const static size_t MaxPinnedXferSize = 32;
  pinnedXferSize_ = std::min(GPU_PINNED_XFER_SIZE, MaxPinnedXferSize) * Mi;
  pinnedMinXferSize_ = std::min(GPU_PINNED_MIN_XFER_SIZE * Ki, pinnedXferSize_);

  // Don't support Denormals for single precision by default
  singleFpDenorm_ = false;

  apuSystem_ = false;

  // Device enqueuing settings
  numDeviceEvents_ = 1024;
  numWaitEvents_ = 8;

  useLightning_ = GPU_ENABLE_LC;
}

bool Settings::create(bool fullProfile, int gfxipVersion) {
  customHostAllocator_ = false;

  if (fullProfile) {
    pinnedXferSize_ = 0;
    stagedXferSize_ = 0;
    xferBufSize_ = 0;
    apuSystem_ = true;
  } else {
    pinnedXferSize_ = std::max(pinnedXferSize_, pinnedMinXferSize_);
    stagedXferSize_ = std::max(stagedXferSize_, pinnedMinXferSize_ + 4 * Ki);
  }
  enableXNACK_ = apuSystem_ ? 1 : 0 ;   // enable xnack for APU system

  // Enable extensions
  enableExtension(ClKhrByteAddressableStore);
  enableExtension(ClKhrGlobalInt32BaseAtomics);
  enableExtension(ClKhrGlobalInt32ExtendedAtomics);
  enableExtension(ClKhrLocalInt32BaseAtomics);
  enableExtension(ClKhrLocalInt32ExtendedAtomics);
  enableExtension(ClKhrInt64BaseAtomics);
  enableExtension(ClKhrInt64ExtendedAtomics);
  enableExtension(ClKhr3DImageWrites);
  enableExtension(ClAmdMediaOps);
  enableExtension(ClAmdMediaOps2);
  enableExtension(ClKhrImage2dFromBuffer);
  if (MesaInterop::Supported()) {
    enableExtension(ClKhrGlSharing);
  }
  // Enable platform extension
  enableExtension(ClAmdDeviceAttributeQuery);

  // Enable KHR double precision extension
  enableExtension(ClKhrFp64);
  enableExtension(ClKhrSubGroups);
  enableExtension(ClKhrDepthImages);
  enableExtension(ClAmdCopyBufferP2P);
  enableExtension(ClKhrFp16);
  supportDepthsRGB_ = true;

  if (useLightning_) {
    enableExtension(ClAmdAssemblyProgram);
    // enable subnormals for gfx900 and later
    if (gfxipVersion >= 900) {
      singleFpDenorm_ = true;
    }
  } else {
    // Also enable AMD double precision extension?
    enableExtension(ClAmdFp64);
  }

  // Override current device settings
  override();

  return true;
}

void Settings::override() {
  // Limit reported workgroup size
  if (GPU_MAX_WORKGROUP_SIZE != 0) {
    preferredWorkGroupSize_ = GPU_MAX_WORKGROUP_SIZE;
  }

  if (GPU_MAX_WORKGROUP_SIZE_2D_X != 0) {
    maxWorkGroupSize2DX_ = GPU_MAX_WORKGROUP_SIZE_2D_X;
  }
  if (GPU_MAX_WORKGROUP_SIZE_2D_Y != 0) {
    maxWorkGroupSize2DY_ = GPU_MAX_WORKGROUP_SIZE_2D_Y;
  }

  if (GPU_MAX_WORKGROUP_SIZE_3D_X != 0) {
    maxWorkGroupSize3DX_ = GPU_MAX_WORKGROUP_SIZE_3D_X;
  }
  if (GPU_MAX_WORKGROUP_SIZE_3D_Y != 0) {
    maxWorkGroupSize3DY_ = GPU_MAX_WORKGROUP_SIZE_3D_Y;
  }
  if (GPU_MAX_WORKGROUP_SIZE_3D_Z != 0) {
    maxWorkGroupSize3DZ_ = GPU_MAX_WORKGROUP_SIZE_3D_Z;
  }

  if (!flagIsDefault(GPU_MAX_COMMAND_QUEUES)) {
    commandQueues_ = GPU_MAX_COMMAND_QUEUES;
  }

  if (!flagIsDefault(GPU_XFER_BUFFER_SIZE)) {
    xferBufSize_ = GPU_XFER_BUFFER_SIZE * Ki;
  }

  if (!flagIsDefault(GPU_PINNED_MIN_XFER_SIZE)) {
    pinnedMinXferSize_ = std::min(GPU_PINNED_MIN_XFER_SIZE * Ki, pinnedXferSize_);
  }

  if (!flagIsDefault(AMD_GPU_FORCE_SINGLE_FP_DENORM)) {
    switch (AMD_GPU_FORCE_SINGLE_FP_DENORM) {
      case 0:
        singleFpDenorm_ = false;
        break;
      case 1:
        singleFpDenorm_ = true;
        break;
      default:
        break;
    }
  }
}

}  // namespace roc

#endif  // WITHOUT_GPU_BACKEND