nvme: Only attach to storage NVMe devices

Only attach CAM to the nvme storage devices.

Sponsored by:		Netflix

sys/cam/cam_ccb.h

@@ -650,7 +650,7 @@ struct ccb_pathinq_settings_nvme {
 	uint8_t  bus;
 	uint8_t  slot;
 	uint8_t  function;
-	uint8_t  extra;
+	uint8_t  progif;
 	char	 dev_name[NVME_DEV_NAME_LEN]; /* nvme controller dev name for this device */
 };
 _Static_assert(sizeof(struct ccb_pathinq_settings_nvme) == 64,

sys/dev/nvme/nvme_sim.c

@@ -208,7 +208,7 @@ nvme_sim_action(struct cam_sim *sim, union ccb *ccb)
 		cpi->xport_specific.nvme.bus = pci_get_bus(dev);
 		cpi->xport_specific.nvme.slot = pci_get_slot(dev);
 		cpi->xport_specific.nvme.function = pci_get_function(dev);
-		cpi->xport_specific.nvme.extra = 0;
+		cpi->xport_specific.nvme.progif = pci_get_progif(dev);
 		strlcpy(cpi->xport_specific.nvme.dev_name, device_get_nameunit(dev),
 		    sizeof(cpi->xport_specific.nvme.dev_name));
 		cpi->hba_vendor = pci_get_vendor(dev);
@@ -314,6 +314,13 @@ nvme_sim_probe(device_t dev)
 {
 	if (nvme_use_nvd)
 		return (ENXIO);
+	/*
+	 * Only do storage devices with CAM. NVMHCI 1.0 interfaces are the only
+	 * ones that have namespaces with LBA ranges on them.
+	 */
+	if (pci_get_progif(device_get_parent(dev)) !=
+	    PCIP_STORAGE_NVM_ENTERPRISE_NVMHCI_1_0)
+		return (ENXIO);
 
 	device_set_desc(dev, "nvme cam");
 	return (BUS_PROBE_DEFAULT);