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

scsi_errmsg - display a SCSI request sense message

#include <sys/scsi/scsi.h>
void scsi_errmsg(struct scsi_device *devp, struct scsi_pkt *pktp,
     char *drv_name, int severity, daddr_t blkno, daddr_t err_blkno,
     struct scsi_key_strings *cmdlist, struct scsi_extended_sense *sensep);

illumos DDI specific (illumos DDI).

devp
Pointer to the scsi_device(9S) structure.

pktp

Pointer to a scsi_pkt(9S) structure.

drv_name

String used by scsi_log(9F).

severity

Error severity level, maps to severity strings below.

blkno

Requested block number.

err_blkno

Error block number.

cmdlist

An array of SCSI command description strings.

sensep

A pointer to a scsi_extended_sense(9S) structure.

The scsi_errmsg() function interprets the request sense information in the sensep pointer and generates a standard message that is displayed using scsi_log(9F). 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 following table:

Severity Value: String:
SCSI_ERR_ALL All
SCSI_ERR_UNKNOWN Unknown
SCSI_ERR_INFO Informational
SCSI_ERR_RECOVERE Recovered
SCSI_ERR_RETRYABL 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_errmsg() function may be called from user, interrupt, or kernel context.

Example 1 Generating error information.

This entry:


scsi_errmsg(devp, pkt, "sd", SCSI_ERR_INFO, bp->b_blkno,
         err_blkno, sd_cmds, rqsense);

Generates:


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: QUANTUM Serial Number: 123456
Sense Key:  Unit Attention
ASC: 0x29 (reset), ASCQ: 0x0, FRU: 0x0

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

Writing Device Drivers

January 16, 2006 OmniOS