1 files changed, 65 insertions, 0 deletions
diff --git a/src/common-utils/nvpci-utils.c b/src/common-utils/nvpci-utils.c
new file mode 100644
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+++ b/src/common-utils/nvpci-utils.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 NVIDIA Corporation
+ *
+ * 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.
+ */
+
+#include "nvpci-utils.h"
+
+/*
+ * libpciaccess stores the device class in bits 16-23, subclass in 8-15, and
+ * interface in bits 0-7 of dev->device_class.  We care only about the class
+ * and subclass.
+ */
+const uint32_t PCI_CLASS_DISPLAY_VGA = 0x30000;
+const uint32_t PCI_CLASS_SUBCLASS_MASK = 0xffff00;
+
+/*
+ * nvpci_find_gpu_by_vendor() - use libpciaccess to find all VGA and 3D PCI
+ * devices matching the passed-in vendor_id (which may be set to PCI_MATCH_ANY).
+ * The caller is responsible for calling pci_system_init() before using this
+ * function, and pci_system_cleanup() when libpciaccess is no longer needed.
+ */
+struct pci_device_iterator *nvpci_find_gpu_by_vendor(uint32_t vendor_id)
+{
+    const struct pci_id_match match = {
+        .vendor_id = vendor_id,
+        .device_id = PCI_MATCH_ANY,
+        .subvendor_id = PCI_MATCH_ANY,
+        .subdevice_id = PCI_MATCH_ANY,
+        .device_class = PCI_CLASS_DISPLAY_VGA,
+        /*
+         * Ignore bit 1 of the subclass, to allow both 0x30000 (VGA controller)
+         * and 0x30200 (3D controller).
+         */
+        .device_class_mask = PCI_CLASS_SUBCLASS_MASK & ~0x200,
+    };
+
+    return pci_id_match_iterator_create(&match);
+}
+
+/*
+ * nvpci_dev_is_vga() - test whether the passed-in struct pci_device* has the
+ * VGA device class 0x0300 (and not 3D class 0x0302).
+ */
+int nvpci_dev_is_vga(struct pci_device *dev)
+{
+    return (dev->device_class & PCI_CLASS_SUBCLASS_MASK) ==
+           PCI_CLASS_DISPLAY_VGA;
+}