/* Copyright (c) 2018-2022 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 SRC_PROXY_TRACKER_H_
#define SRC_PROXY_TRACKER_H_

#include <amd_hsa_signal.h>
#include <assert.h>
#include <hsa.h>
#include <hsa_ext_amd.h>

#include <atomic>

#include "util/hsa_rsrc_factory.h"
#include "util/exception.h"
#include "util/logger.h"
#include "core/trace_buffer.h"

namespace proxy {
class Tracker {
 public:
  typedef util::HsaRsrcFactory::timestamp_t timestamp_t;
  typedef roctracer::trace_entry_t entry_t;
  typedef roctracer::entry_type_t entry_type_t;

  // Add tracker entry
  inline static void Enable(entry_type_t type, const hsa_agent_t& agent, const hsa_signal_t& signal,
                            entry_t* entry) {
    hsa_status_t status = HSA_STATUS_ERROR;
    util::HsaRsrcFactory* hsa_rsrc = &(util::HsaRsrcFactory::Instance());

    // Creating a new tracker entry
    entry->type = type;
    entry->agent = agent;
    entry->dev_index = 0;  // hsa_rsrc->GetAgentInfo(agent)->dev_index;
    entry->orig = signal;
    entry->dispatch = hsa_rsrc->TimestampNs();
    entry->valid.store(roctracer::TRACE_ENTRY_INIT, std::memory_order_release);

    // Creating a proxy signal
    status = hsa_signal_create(1, 0, NULL, &(entry->signal));
    if (status != HSA_STATUS_SUCCESS) EXC_RAISING(status, "hsa_signal_create");
    status =
        hsa_amd_signal_async_handler(entry->signal, HSA_SIGNAL_CONDITION_LT, 1, Handler, entry);
    if (status != HSA_STATUS_SUCCESS) EXC_RAISING(status, "hsa_amd_signal_async_handler");
  }

  // Delete tracker entry
  inline static void Disable(entry_t* entry) {
    hsa_signal_destroy(entry->signal);
    entry->valid.store(roctracer::TRACE_ENTRY_INV, std::memory_order_release);
  }

 private:
  // Entry completion
  inline static void Complete(hsa_signal_value_t signal_value, entry_t* entry) {
    // Query begin/end and complete timestamps
    util::HsaRsrcFactory* hsa_rsrc = &(util::HsaRsrcFactory::Instance());
    if (entry->type == roctracer::COPY_ENTRY_TYPE) {
      hsa_amd_profiling_async_copy_time_t async_copy_time{};
      hsa_status_t status = hsa_amd_profiling_get_async_copy_time(entry->signal, &async_copy_time);
      if (status != HSA_STATUS_SUCCESS)
        EXC_RAISING(status, "hsa_amd_profiling_get_async_copy_time");
      entry->begin = hsa_rsrc->SysclockToNs(async_copy_time.start);
      entry->end = hsa_rsrc->SysclockToNs(async_copy_time.end);
    } else {
      hsa_amd_profiling_dispatch_time_t dispatch_time{};
      hsa_status_t status =
          hsa_amd_profiling_get_dispatch_time(entry->agent, entry->signal, &dispatch_time);
      if (status != HSA_STATUS_SUCCESS) EXC_RAISING(status, "hsa_amd_profiling_get_dispatch_time");
      entry->begin = hsa_rsrc->SysclockToNs(dispatch_time.start);
      entry->end = hsa_rsrc->SysclockToNs(dispatch_time.end);
      entry->dev_index = (hsa_rsrc->GetAgentInfo(entry->agent))->dev_index;
    }

    entry->complete = hsa_rsrc->TimestampNs();
    hsa_signal_t orig = entry->orig;
    hsa_signal_t signal = entry->signal;

    // Releasing completed entry
    entry->valid.store(roctracer::TRACE_ENTRY_COMPL, std::memory_order_release);

    // Original intercepted signal completion
    if (orig.handle) {
      amd_signal_t* orig_signal_ptr = reinterpret_cast<amd_signal_t*>(orig.handle);
      amd_signal_t* prof_signal_ptr = reinterpret_cast<amd_signal_t*>(signal.handle);
      orig_signal_ptr->start_ts = prof_signal_ptr->start_ts;
      orig_signal_ptr->end_ts = prof_signal_ptr->end_ts;

      const hsa_signal_value_t new_value = hsa_signal_load_relaxed(orig) - 1;
      if (signal_value != new_value)
        EXC_ABORT(HSA_STATUS_ERROR, "Tracker::Complete bad signal value");
      hsa_signal_store_screlease(orig, signal_value);
    }
    hsa_signal_destroy(signal);
  }

  // Handler for packet completion
  static bool Handler(hsa_signal_value_t signal_value, void* arg) {
    // Acquire entry
    entry_t* entry = reinterpret_cast<entry_t*>(arg);
    while (entry->valid.load(std::memory_order_acquire) != roctracer::TRACE_ENTRY_INIT)
      sched_yield();

    // Complete entry
    Tracker::Complete(signal_value, entry);
    return false;
  }
};

}  // namespace proxy

#endif  // SRC_PROXY_TRACKER_H_