The following sections discuss the abort and reset entry points for SCSI HBA.
The tran_abort(9E) entry point for a SCSI HBA driver is called to abort any commands that are currently in transport for a particular target. This entry point is called when a target driver calls scsi_abort(9F).
The tran_abort() entry point should attempt to abort the command denoted by the pkt parameter. If the pkt parameter is NULL, tran_abort() should attempt to abort all outstanding commands in the transport layer for the particular target or logical unit.
Each command successfully aborted must be marked with pkt_reason CMD_ABORTED and pkt_statistics OR'd with STAT_ABORTED.
The tran_reset(9E) entry point for a SCSI HBA driver is called to reset either the SCSI bus or a particular SCSI target device. This entry point is called when a target driver calls scsi_reset(9F).
The tran_reset() entry point must reset the SCSI bus if level is RESET_ALL. If level is RESET_TARGET, just the particular target or logical unit must be reset.
Active commands affected by the reset must be marked with pkt_reason CMD_RESET. The type of reset determines whether STAT_BUS_RESET or STAT_DEV_RESET should be used to OR pkt_statistics.
Commands in the transport layer, but not yet active on the target, must be marked with pkt_reason CMD_RESET, and pkt_statistics OR'd with STAT_ABORTED.
tran_bus_reset(9E) must reset the SCSI bus without resetting targets.
#include <sys/scsi/scsi.h> int tran_bus_reset(dev_info_t *hba-dip, int level);
where:
Pointer associated with the SCSI HBA
Must be set to RESET_BUS so that only the SCSI bus is reset, not the targets
The tran_bus_reset() vector in the scsi_hba_tran(9S) structure should be initialized during the HBA driver's attach(9E). The vector should point to an HBA entry point that is to be called when a user initiates a bus reset.
Implementation is hardware specific. If the HBA driver cannot reset the SCSI bus without affecting the targets, the driver should fail RESET_BUS or not initialize this vector.
Use the tran_reset_notify(9E) entry point when a SCSI bus reset occurs. This function requests the SCSI HBA driver to notify the target driver by callback.
isp_scsi_reset_notify( struct scsi_address *ap, int flag, void (*callback)(caddr_t), caddr_t arg) { struct isp *isp; struct isp_reset_notify_entry *p, *beforep; int rval = DDI_FAILURE; isp = (struct isp *)ap->a_hba_tran->tran_hba_private; mutex_enter(ISP_REQ_MUTEX(isp)); /* * Try to find an existing entry for this target */ p = isp->isp_reset_notify_listf; beforep = NULL; while (p) { if (p->ap == ap) break; beforep = p; p = p->next; } if ((flag & SCSI_RESET_CANCEL) && (p != NULL)) { if (beforep == NULL) { isp->isp_reset_notify_listf = p->next; } else { beforep->next = p->next; } kmem_free((caddr_t)p, sizeof (struct isp_reset_notify_entry)); rval = DDI_SUCCESS; } else if ((flag & SCSI_RESET_NOTIFY) && (p == NULL)) { p = kmem_zalloc(sizeof (struct isp_reset_notify_entry), KM_SLEEP); p->ap = ap; p->callback = callback; p->arg = arg; p->next = isp->isp_reset_notify_listf; isp->isp_reset_notify_listf = p; rval = DDI_SUCCESS; } mutex_exit(ISP_REQ_MUTEX(isp)); return (rval); }