From adebdfc5809fb4be2ca31d9c48924f9d6fcd5eed Mon Sep 17 00:00:00 2001
From: Craig Warren <craig.warren@northumbria.ac.uk>
Date: Tue, 1 Jun 2021 11:30:18 +0100
Subject: [PATCH] Beginning host/GPU detection for OpenCL

---
 gprMax/config.py              |  4 +-
 gprMax/utilities/host_info.py | 78 +++++++++++++++++++++++------------
 2 files changed, 53 insertions(+), 29 deletions(-)

diff --git a/gprMax/config.py b/gprMax/config.py
index 12505f61..c6a0fd62 100644
--- a/gprMax/config.py
+++ b/gprMax/config.py
@@ -28,7 +28,7 @@ from scipy.constants import c
 from scipy.constants import epsilon_0 as e0
 from scipy.constants import mu_0 as m0
 
-from .utilities.host_info import detect_gpus, get_host_info
+from .utilities.host_info import detect_cuda_gpus, get_host_info
 from .utilities.utilities import get_terminal_width
 
 logger = logging.getLogger(__name__)
@@ -236,7 +236,7 @@ class SimulationConfig:
             if sys.platform == 'win32': self.cuda['nvcc_opts'] = ['-w']
 
             # List of GPU objects of available GPUs
-            self.cuda['gpus'] = detect_gpus()
+            self.cuda['gpus'] = detect_cuda_gpus()
 
         # Subgrid parameter may not exist if user enters via CLI
         try:
diff --git a/gprMax/utilities/host_info.py b/gprMax/utilities/host_info.py
index b2034651..70a7d5d7 100644
--- a/gprMax/utilities/host_info.py
+++ b/gprMax/utilities/host_info.py
@@ -302,32 +302,30 @@ def mem_check_all(grids):
 class GPU:
     """GPU information."""
 
-    def __init__(self, deviceID):
-        """
-        Args:
-            deviceID (int): Device ID for GPU.
-        """
+    def __init__(self):
 
-        self.deviceID = deviceID
+        self.deviceID = None
         self.name = None
         self.pcibusID = None
         self.constmem = None
         self.totalmem = None
 
-    def get_gpu_info(self, drv):
+    def get_cuda_gpu_info(self, drv, deviceID):
         """Set information about GPU.
 
         Args:
-            drv (object): PyCuda driver.
+            drv (object): pycuda driver.
+            deviceID (int): Device ID for GPU.
         """
 
+        self.deviceID = deviceID
         self.name = drv.Device(self.deviceID).name()
         self.pcibusID = drv.Device(self.deviceID).pci_bus_id()
         self.constmem = drv.Device(self.deviceID).total_constant_memory
         self.totalmem = drv.Device(self.deviceID).total_memory()
 
 
-def detect_gpus():
+def detect_cuda_gpus():
     """Get information about Nvidia GPU(s).
 
     Returns:
@@ -336,26 +334,52 @@ def detect_gpus():
 
     try:
         import pycuda.driver as drv
+        has_pycuda = True
     except ImportError:
-        logger.exception('To use gprMax in GPU mode the pycuda package must be installed, and you must have a NVIDIA CUDA-Enabled GPU (https://developer.nvidia.com/cuda-gpus).')
-        raise
-    drv.init()
+        logger.warning('pycuda not detected - to use gprMax in GPU mode the pycuda package must be installed, and you must have a NVIDIA CUDA-Enabled GPU (https://developer.nvidia.com/cuda-gpus).')
+        has_pycuda = False
+    
+    if has_pycuda:
+        drv.init()
+
+        # Check and list any CUDA-Enabled GPUs
+        if drv.Device.count() == 0:
+            logger.exception('No NVIDIA CUDA-Enabled GPUs detected (https://developer.nvidia.com/cuda-gpus)')
+            raise ValueError
+        elif 'CUDA_VISIBLE_DEVICES' in os.environ:
+            deviceIDsavail = os.environ.get('CUDA_VISIBLE_DEVICES')
+            deviceIDsavail = [int(s) for s in deviceIDsavail.split(',')]
+        else:
+            deviceIDsavail = range(drv.Device.count())
+
+        # Gather information about detected GPUs
+        gpus = []
+        for ID in deviceIDsavail:
+            gpu = GPU()
+            gpu.get_cuda_gpu_info(drv, ID)
+            gpus.append(gpu)
 
-    # Check and list any CUDA-Enabled GPUs
-    if drv.Device.count() == 0:
-        logger.exception('No NVIDIA CUDA-Enabled GPUs detected (https://developer.nvidia.com/cuda-gpus)')
-        raise ValueError
-    elif 'CUDA_VISIBLE_DEVICES' in os.environ:
-        deviceIDsavail = os.environ.get('CUDA_VISIBLE_DEVICES')
-        deviceIDsavail = [int(s) for s in deviceIDsavail.split(',')]
     else:
-        deviceIDsavail = range(drv.Device.count())
-
-    # Gather information about detected GPUs
-    gpus = []
-    for ID in deviceIDsavail:
-        gpu = GPU(deviceID=ID)
-        gpu.get_gpu_info(drv)
-        gpus.append(gpu)
+        gpus = None
 
     return gpus
+
+
+def detect_opencl():
+    """Get information about OpenCL platforms and devices.
+
+    Returns:
+        gpus (list): Detected GPU(s) object(s).
+    """
+
+    try:
+        import pyopencl as cl
+        has_pyopencl = True
+    except ImportError:
+        logger.warning('pyopencl not detected - to use gprMax with OpenCL, the pyopencl package must be installed, and you must have at least one OpenCL capable platform.')
+        has_pyopencl = False
+
+    if has_pyopencl:
+        platforms = cl.get_platforms()
+        platform_names = [p.name for p in platforms]
+        logger.info(platform_names)