//
// Copyright (c) 2013 Advanced Micro Devices, Inc. All rights reserved.
//

#include "cl_common.hpp"
#include "platform/memory.hpp"
#include "platform/context.hpp"
#include "platform/command.hpp"

/*! \addtogroup API
 *  @{
 *
 *  \addtogroup CL_Pipes
 *  @{
 */

/*! \brief creates a pipe object.
 *
 * \param context is a valid OpenCL context used to create the pipe object.
 *
 * \param flags is a bit-field that is used to specify allocation and usage
 * information such as the memory arena that should be used to allocate the pipe
 * object and how it will be used. Only CL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY,
 * CL_MEM_READ_WRITE and CL_MEM_HOST_NO_ACCESS can be specified when creating a
 * pipe object. If value specified for flags is 0, the default is used which is
 * CL_MEM_READ_WRITE.
 *
 * \param pipe_packet_size is the size in bytes of a pipe packet.
 *
 * \param pipe_max_packets specifies the pipe capacity by specifying the maximum
 * number of packets the pipe can hold.
 *
 * \param properties specifies a list of properties for the pipe and their
 * corresponding values. Each property name is immediately followed by the
 * corresponding desired value. The list is terminated with 0.
 *
 * In OpenCL 2.0, properties must be NULL.
 *
 * \param errcode_ret will return an appropriate error code.
 * If \a errcode_ret is NULL, no error code is returned.
 *
 * \return a valid non-zero pipe object and \a errcode_ret is set to CL_SUCCESS
 * if the pipe object is created successfully. Otherwise, it returns a NULL
 * value with one of the following error values returned in errcode_ret:
 * - CL_INVALID_CONTEXT if context is not a valid context.
 * - CL_INVALID_VALUE if values specified in flags are not as defined above.
 * - CL_INVALID_VALUE if properties is not NULL.
 * - CL_INVALID_PIPE_SIZE if pipe_packet_size is 0 or the pipe_packet_size
 *   exceeds CL_DEVICE_PIPE_MAX_PACKET_SIZE value for all devices in context
 *   or if pipe_max_packets is 0.
 * - CL_MEM_OBJECT_ALLOCATION_FAILURE if there is a failure to allocate memory
 *   for the pipe object.
 * - CL_OUT_OF_RESOURCES if there is a failure to allocate resources required
 *   by the OpenCL implementation on the device.
 * - CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required
 *   by the OpenCL implementation on the host.
 *
 * \version 2.0r19
 */
RUNTIME_ENTRY_RET(cl_mem, clCreatePipe,
                  (cl_context context, cl_mem_flags flags, cl_uint pipe_packet_size,
                   cl_uint pipe_max_packets, const cl_pipe_properties* properties,
                   cl_int* errcode_ret)) {
  if (!is_valid(context)) {
    *not_null(errcode_ret) = CL_INVALID_CONTEXT;
    return NULL;
  }

  // check flags for validity
  cl_bitfield temp =
      flags & (CL_MEM_READ_WRITE | CL_MEM_WRITE_ONLY | CL_MEM_READ_ONLY | CL_MEM_HOST_NO_ACCESS);

  if (temp &&
      !(CL_MEM_READ_WRITE == temp || CL_MEM_WRITE_ONLY == temp || CL_MEM_READ_ONLY == temp ||
        CL_MEM_HOST_NO_ACCESS == temp)) {
    *not_null(errcode_ret) = CL_INVALID_VALUE;
    LogWarning("invalid parameter \"flags\"");
    return (cl_mem)0;
  }

  size_t size = sizeof(struct clk_pipe_t) + pipe_packet_size * pipe_max_packets;

  const std::vector<amd::Device*>& devices = as_amd(context)->devices();
  bool sizePass = false;
  for (const auto& it : devices) {
    if (it->info().maxMemAllocSize_ >= size) {
      sizePass = true;
      break;
    }
  }

  // check size
  if (pipe_packet_size == 0 || pipe_max_packets == 0 || !sizePass) {
    *not_null(errcode_ret) = CL_INVALID_PIPE_SIZE;
    LogWarning("invalid parameter \"size = 0 or size > CL_DEVICE_PIPE_MAX_PACKET_SIZE\"");
    return (cl_mem)0;
  }

  amd::Context& amdContext = *as_amd(context);
  amd::Memory* mem = new (amdContext)
      amd::Pipe(amdContext, flags, size, (size_t)pipe_packet_size, (size_t)pipe_max_packets);
  if (mem == NULL) {
    *not_null(errcode_ret) = CL_OUT_OF_HOST_MEMORY;
    return (cl_mem)0;
  }

  if (!mem->create()) {
    *not_null(errcode_ret) = CL_MEM_OBJECT_ALLOCATION_FAILURE;
    mem->release();
    return NULL;
  }

  *not_null(errcode_ret) = CL_SUCCESS;
  return as_cl(mem);
}
RUNTIME_EXIT

/*! \brief Get information specific to a pipe object created with clCreatePipe.
 *
 * \param param_name specifies the information to query.
 *
 * \param param_value is a pointer to memory where the appropriate result being
 * queried is returned. If param_value is NULL, it is ignored.
 *
 * \param param_value_size is used to specify the size in bytes of memory
 * pointed to by param_value. This size must be >= size of return type.
 *
 * \param param_value_size_ret returns the actual size in bytes of data being
 * queried by param_value. If param_value_size_ret is NULL, it is ignored.
 *
 * \return CL_SUCCESS if the function is executed successfully. Otherwise, it
 * returns one of the following errors:
 * - CL_INVALID_VALUE if param_name is not valid, or if size in bytes specified
 *   by param_value_size is < size of return type and param_value is not NULL.
 * - CL_INVALID_MEM_OBJECT if pipe is a not a valid pipe object.
 * - CL_OUT_OF_RESOURCES if there is a failure to allocate resources required
 *   by the OpenCL implementation on the device.
 * - CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required
 *   by the OpenCL implementation on the host.
 *
 * \version 2.0r19
 */
RUNTIME_ENTRY(cl_int, clGetPipeInfo,
              (cl_mem memobj, cl_image_info param_name, size_t param_value_size, void* param_value,
               size_t* param_value_size_ret)) {
  if (!is_valid(memobj)) {
    return CL_INVALID_MEM_OBJECT;
  }

  amd::Pipe* pipe = as_amd(memobj)->asPipe();
  if (pipe == NULL) {
    return CL_INVALID_MEM_OBJECT;
  }

  switch (param_name) {
    case CL_PIPE_PACKET_SIZE: {
      cl_uint packetSize = pipe->getPacketSize();
      return amd::clGetInfo(packetSize, param_value_size, param_value, param_value_size_ret);
    }
    case CL_PIPE_MAX_PACKETS: {
      cl_uint count = pipe->getMaxNumPackets();
      return amd::clGetInfo(count, param_value_size, param_value, param_value_size_ret);
    }
    default:
      break;
  }

  return CL_INVALID_VALUE;
}
RUNTIME_EXIT

/*! @}
 *  @}
 */