Index: sys/dev/nvme/nvme.h
===================================================================
--- sys/dev/nvme/nvme.h
+++ sys/dev/nvme/nvme.h
@@ -45,6 +45,9 @@
 #define	NVME_IO_TEST			_IOWR('n', 100, struct nvme_io_test)
 #define	NVME_BIO_TEST			_IOWR('n', 101, struct nvme_io_test)
 
+/* Pseudo-Linux compatibility ioctls */
+#define	NVME_PCI_ID			_IOR('n', 200, uint64_t)
+
 /*
  * Macros to deal with NVME revisions, as defined VS register
  */
Index: sys/dev/nvme/nvme_ctrlr.c
===================================================================
--- sys/dev/nvme/nvme_ctrlr.c
+++ sys/dev/nvme/nvme_ctrlr.c
@@ -1113,6 +1113,7 @@
 {
 	struct nvme_controller			*ctrlr;
 	struct nvme_pt_command			*pt;
+	uint64_t				id;
 
 	ctrlr = cdev->si_drv1;
 
@@ -1132,6 +1133,12 @@
 		gnsid->nsid = 0;
 		break;
 	}
+	case NVME_PCI_ID:
+		id = pci_get_devid(ctrlr->dev);
+		id |= (uint64_t)pci_get_subvendor(ctrlr->dev) << 32;
+		id |= (uint64_t)pci_get_subdevice(ctrlr->dev) << 48;
+		*(uint64_t *)arg = id;
+		break;
 	default:
 		return (ENOTTY);
 	}