Displaying TPGS Bits Received
The following script displays TPGS bits received in standard INQUIRY data.
#!/usr/sbin/dtrace -s /* * Response to INQUIRY with EVPD bit not set, i.e. DATA IN * contains standard INQUIRY data. * Tracing only on vHCI enumerated paths (addr_path != "NULL") * with DATA IN buffer mapped to a kernel virtual memory space. */ scsi:::cmd-response /(args[1]->cdb_data[0] == 0x12) && !(args[1]->cdb_data[1] & 0x01) && (args[0]->addr_path != "NULL") && (args[2]->data_mapped)/ { printf("TPGS bits 0x%x received from %s\n", (args[2]->data_ptr[5] & 0x30) >> 4, args[0]->addr_path); }