SCSI_RESET(9F)SCSI_RESET(9F)NAMEscsi_reset - reset a SCSI bus or target
SYNOPSIS
#include <sys/scsi/scsi.h>
int scsi_reset(struct scsi_address *ap, int level);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
ap
Pointer to the scsi_address structure.
level
The level of reset required.
DESCRIPTION
The scsi_reset() function asks the host adapter driver to reset the
SCSI bus or a SCSI target as specified by level. If level equals
RESET_ALL, the SCSI bus is reset. If it equals RESET_TARGET, ap is used
to determine the target to be reset. If it equals RESET_LUN, ap is used
to determine the logical unit to be reset.
When given the RESET_LUN level, scsi_reset() can return failure if the
LOGICAL UNIT RESET message is not supported by the target device, or if
the underlying HBA driver does not implement the ability to issue a
LOGICAL UNIT RESET message.
Note that, at the point when scsi_reset() resets the logical unit (case
RESET_LUN), or the target (case RESET_TARGET), or the bus (case
RESET_ALL), there might be one or more command packets outstanding.
That is, packets have been passed to scsi_transport(), and queued or
possibly transported, but the commands have not been completed and the
target completion routine has not been called for those packets.
The successful call to scsi_reset() has the side effect that any such
commands currently outstanding are aborted, at which point the packets
are marked with pkt_reason set to CMD_RESET, and the appropriate bit --
either STAT_BUS_RESET or STAT_DEV_RESET -- is set in pkt_statistics.
Once thus appropriately marked, the aborted command packets are passed
to the target driver command completion routine.
Also note that, at the moment that a thread executing scsi_reset()
actually resets the target or the bus, it is possible that a second
thread may have already called scsi_transport(), but not yet queued or
transported its command. In this case the HBA will not yet have
received the second thread's packet and this packet will not be
aborted.
RETURN VALUES
The scsi_reset() function returns:
1
Upon success.
0
Upon failure.
CONTEXT
The scsi_reset() function can be called from user, interrupt, or kernel
context.
SEE ALSOtran_reset(9E), tran_reset_notify(9E), scsi_abort(9F)
Writing Device Drivers
Jan 16, 2006 SCSI_RESET(9F)
