#!/usr/bin/python

import os
import re
import subprocess
import sys

# get current working directory
CWD = os.path.dirname(os.path.realpath(__file__))

ISA_TO_ID = {
  # Kaveri - Temporary
  "gfx700" : [0x130f],
  # Hawaii
  "gfx701" : [0x67a0, 0x67a1, 0x67a2, 0x67a8, 0x67a9, 0x67aa, 0x67b0, 0x67b1,
              0x67b8, 0x67b9, 0x67ba, 0x67be],
  # Carrizo
  "gfx801" : [0x9870, 0x9874, 0x9875, 0x9876, 0x9877, 0x98e4],
  # Tonga
  "gfx802" : [0x6920, 0x6921, 0x6928, 0x6929, 0x692b, 0x692f, 0x6930, 0x6938,
              0x6939],
  # Fiji
  "gfx803" : [0x7300, 0x730f,
  # Polaris10
              0x67c0, 0x67c1, 0x67c2, 0x67c4, 0x67c7, 0x67c8, 0x67c9, 0x67ca,
              0x67cc, 0x67cf,
  # Polaris11
              0x67d0, 0x67df, 0x67e0, 0x67e1, 0x67e3, 0x67e7, 0x67e8, 0x67e9,
              0x67eb, 0x67ef, 0x67ff,
  # Polaris12
              0x6980, 0x6981, 0x6985, 0x6986, 0x6987, 0x6995, 0x6997, 0x699f],
  # Vega10
  "gfx900" : [0x6860, 0x6861, 0x6862, 0x6863, 0x6864, 0x6867, 0x6868, 0x686c,
              0x687f]
}

def staticVars(**kwargs):
  def deco(func):
    for k in kwargs:
      setattr(func, k, kwargs[k])
    return func
  return deco

@staticVars(search_term=re.compile("gfx\d+"))
def getGCNISA(line, match_from_beginning = False):
 if match_from_beginning is True:
   result = getGCNISA.search_term.match(line)
 else:
   result = getGCNISA.search_term.search(line)

 if result is not None:
   return result.group(0)
 return None

def readFromTargetLstFile():
  target_list = []

  # locate target.lst which should be placed at the same directory with this
  # script
  target_lst_path = os.path.join(CWD, "target.lst")
  if os.path.isfile(target_lst_path):
    target_lst_file = open(target_lst_path, 'r')
    for line in target_lst_file:
      # for target.lst match from beginning so targets can be disabled by
      # commenting it out
      target = getGCNISA(line, match_from_beginning = True)
      if target is not None:
        target_list.append(target)
    
  return target_list

def readFromROCMINFO():
  target_list = []

  # locate rocminfo binary which should be placed at the same directory with
  # this script
  rocminfo_executable = os.path.join(CWD, "rocminfo")

  try:
    # run rocminfo
    rocminfo_output = subprocess.Popen(rocminfo_executable, stdout=subprocess.PIPE).communicate()[0].split('\n')
  except:
    rocminfo_output = []

  # search AMDGCN gfx ISA
  line_search_term = re.compile("\A\s+Name:\s+(gfx\d+)")
  for line in rocminfo_output:
    if line_search_term.match(line) is not None:
      target = getGCNISA(line)
      if target is not None:
        target_list.append(target)

  return target_list

def readFromLSPCI():
  target_list = []

  try:
    # run lspci
    lspci_output = subprocess.Popen(["/usr/bin/lspci", "-n", "-d", "1002:"], stdout=subprocess.PIPE).communicate()[0].split('\n')
  except:
    lspci_output = []

  target_search_term = re.compile("1002:\w+")
  for line in lspci_output:
    search_result = target_search_term.search(line)
    if search_result is not None:
      device_id = int(search_result.group(0).split(':')[1], 16)
      # try lookup from ISA_TO_ID dict
      for target in ISA_TO_ID.keys():
        for target_device_id in ISA_TO_ID[target]:
          if device_id == target_device_id:
            target_list.append(target)
            break

  return target_list

def main():
  """Prints the list of available AMD GCN ISA

  The program collects the list in 3 different ways, in the order of
  precendence:

  1. target.lst : user-supplied text file. This is used in a container setting
                  where ROCm stack may usually not available.
  2. rocminfo : a tool shipped with this script to enumerate GPU agents
                available on a working ROCm stack.
  3. lspci : enumerate PCI bus and locate supported devices from a hard-coded
             lookup table.
  """
  target_list = readFromTargetLstFile()

  if len(target_list) == 0:
    target_list = readFromROCMINFO()

  if len(target_list) == 0:
    target_list = readFromLSPCI()

  # workaround to cope with existing rocm_agent_enumerator behavior where gfx000
  # would always be returned
  print "gfx000"
  
  for gfx in target_list:
    print gfx

if __name__ == "__main__":
  main()