SCSI_VU_ERRMSG(9F) Kernel Functions for Drivers SCSI_VU_ERRMSG(9F)

scsi_vu_errmsg - display a SCSI request sense message

#include <sys/scsi/scsi.h>
void scsi_vu_errmsg(struct scsi_pkt *pktp, char *drv_name, int severity,
     int err_blkno, struct scsi_key_strings *cmdlist,
     struct scsi_extended_sense *sensep,
     struct scsi_asq_key_strings *asc_list,
     char **decode_fru struct scsi_device*, char *, int, char);

illumos DDI specific (illumos DDI).

The following parameters are supported:


Pointer to the scsi_device(9S) structure.


Pointer to a scsi_pkt(9S) structure.


String used by scsi_log(9F).


Error severity level, maps to severity strings below.


Requested block number.


Error block number.


An array of SCSI command description strings.


A pointer to a scsi_extended_sense(9S) structure.


A pointer to a array of asc and ascq message list.The list must be terminated with -1 asc value.


This is a function pointer that will be called after the entire sense information has been decoded. The parameters will be the scsi_device structure to identify the device. Second argument will be a pointer to a buffer of length specified by third argument. The fourth argument will be the FRU byte. decode_fru might be NULL if no special decoding is required. decode_fru is expected to return pointer to a char string if decoding possible and NULL if no decoding is possible.

This function is very similar to scsi_errmsg(9F) but allows decoding of vendor-unique ASC/ASCQ and FRU information.

The scsi_vu_errmsg() function interprets the request sense information in the sensep pointer and generates a standard message that is displayed using scsi_log(9F). It first searches the list array for a matching vendor unique code if supplied. If it does not find one in the list then the standard list is searched. The first line of the message is always a CE_WARN, with the continuation lines being CE_CONT. sensep may be NULL, in which case no sense key or vendor information is displayed.

The driver should make the determination as to when to call this function based on the severity of the failure and the severity level that the driver wants to report.

The scsi_device(9S) structure denoted by devp supplies the identification of the device that requested the display. severity selects which string is used in the Error Level: reporting, according to the table below:

     Severity Value:      String:
     SCSI_ERR_ALL         All
     SCSI_ERR_UNKNOWN     Unknown
     SCSI_ERR_INFO        Information
     SCSI_ERR_RECOVERED   Recovered
     SCSI_ERR_RETRYABLE   Retryable
     SCSI_ERR_FATAL       Fatal

blkno is the block number of the original request that generated the error. err_blkno is the block number where the error occurred. cmdlist is a mapping table for translating the SCSI command code in pktp to the actual command string.

The cmdlist is described in the structure below:

struct scsi_key_strings {
    int key;
    char *message;

For a basic SCSI disk, the following list is appropriate:

     static struct scsi_key_strings scsi_cmds[] = {
             0x00, "test unit ready",
             0x01, "rezero/rewind",
             0x03, "request sense",
             0x04, "format",
             0x07, "reassign",
             0x08, "read",
             0x0a, "write",
             0x0b, "seek",
             0x12, "inquiry",
             0x15, "mode select",
             0x16, "reserve",
             0x17, "release",
             0x18, "copy",
             0x1a, "mode sense",
             0x1b, "start/stop",
             0x1e, "door lock",
             0x28, "read(10)",
             0x2a, "write(10)",
             0x2f, "verify",
             0x37, "read defect data",
             0x3b, "write buffer",
             -1, NULL

The scsi_vu_errmsg() function may be called from user, interrupt, or kernel context.

Example 1 Using scsi_vu_errmsg()

     struct scsi_asq_key_strings cd_slist[] = {
             0x81, 0, "Logical Unit is inaccessible",
             -1, 0, NULL,
     scsi_vu_errmsg(devp, pkt, "sd",
                    SCSI_ERR_INFO, bp->b_blkno, err_blkno,
                    sd_cmds, rqsense, cd_list,

This generates the following console warning:

WARNING: /sbus@1,f8000000/esp@0,800000/sd@1,0 (sd1):
          Error for Command: read        Error Level: Informational
          Requested Block: 23936         Error Block: 23936
          Vendor: XYZ                Serial Number: 123456
          Sense Key:  Unit Attention
          ASC: 0x81 (Logical Unit is inaccessible), ASCQ: 0x0
          FRU: 0x11 (replace LUN 1, located in slot 1)

cmn_err(9F), scsi_errmsg(9F), scsi_log(9F), scsi_errmsg(9F), scsi_asc_key_strings(9S), scsi_device(9S), scsi_extended_sense(9S), scsi_pkt(9S)

Writing Device Drivers

STREAMS Programming Guide

April 9, 2016 OmniOS