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10879
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "runtime/gpu.hpp"
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26 #include "utilities/ostream.hpp"
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27
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28 void gpu::probe_gpu() {
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29 set_available(gpu::Linux::probe_gpu());
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30 if (TraceGPUInteraction) {
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31 tty->print_cr("gpu_linux::probe_gpu(): %d", gpu::is_available());
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32 }
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33 }
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34
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35 /*
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36 * Probe for CUDA device on PCI bus using /proc/bus/pci/devices. Do
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37 * not rely on CUDA tool kit being installed. We will check if CUDA
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38 * library is installed later.
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39 */
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40
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41 static unsigned int nvidia_vendor_id = 0x10de;
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42 static unsigned int nvidia_gk110_dev_id = 0x1005;
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43
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44 bool gpu::Linux::probe_gpu() {
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45 /*
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46 Open /proc/bus/pci/devices to look for the first CUDA enabled
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47 device. For now, finding the first CUDA device. Will need to
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48 revisit this wo support execution on multiple CUDA devices if
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49 they exist.
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50 */
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51 FILE *pci_devices = fopen("/proc/bus/pci/devices", "r");
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52 char contents[4096];
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53 unsigned int bus_num_devfn_ign;
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54 unsigned int vendor;
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55 unsigned int device;
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56 bool cuda_device_exists = false;
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57 if (pci_devices == NULL) {
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58 tty->print_cr("*** Failed to open /proc/bus/pci/devices");
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59 return cuda_device_exists;
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60 }
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61
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62 while (fgets(contents, sizeof(contents)-1, pci_devices)) {
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63 sscanf(contents, "%04x%04x%04x", &bus_num_devfn_ign, &vendor, &device);
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64 /* Break after finding the first CUDA device. */
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65 if ((vendor == nvidia_vendor_id) && (device = nvidia_gk110_dev_id)) {
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66 cuda_device_exists = true;
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67 if (TraceGPUInteraction) {
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68 tty->print_cr("Found supported nVidia CUDA device vendor : 0x%04x device 0x%04x", vendor, device);
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69 }
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70 break;
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71 }
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72 }
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73
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74 // Close file pointer.
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75 fclose(pci_devices);
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76
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77 return cuda_device_exists;
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78 }
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