include/scsi/scsi_host.h

1 /* SPDX-License-Identifier: GPL-2.0 */
11 #include <linux/blk-mq.h>
58 	 * When unknown ioctl is passed return -ENOIOCTLCMD.
93          * For compatibility, any other non-zero return is treated the
97 	 * this device/host completes, or a period of time determined by
117 	 * define one of these if you don't want to - there is a default
120 	 * own strategy routine, this is where it is specified.  Note - the
149 	 * Return values: 0 on success, non-0 on failure
156 	 * time), you will then get a call to slave_destroy().  This is
161 	 * each time a device is tore down.
175 	 * Things currently recommended to be handled at this time include:
183 	 *     device->sdtr will be true if the device supports SDTR messages.
188 	 * 6.  Return 0 on success, non-0 on error.  The device will be marked
190 	 *     non-0, your slave_destroy routine will never get called for this
192 	 *     up after yourself before returning non-0
217 	 * Return values: 0 on success, non-0 on failure
237 	 * until it returns 1 with the scsi_host and the elapsed time of
322 	 * Return values: 0 on success, -ve value on failure.
344 	 * This determines if we will use a non-interrupt driven
346 	 * of simultaneous commands a single hw queue in HBA will accept.
353 	 * the case, then it must be reserved.  Please set this_id to -1 if
361 	 * of scatter-gather.
388 	 * individual devices (e.g. 256 for SCSI-1).
433 	 * True if the low-level driver performs its own reset-settle delays.
440 	/* True if the host uses host-wide tagspace */
483 	 * Additional per-command data allocated for the driver.
508 		spin_lock_irqsave(shost->host_lock, irq_flags);		\
509 		rc = func_name##_lck (cmd, cmd->scsi_done);			\
510 		spin_unlock_irqrestore(shost->host_lock, irq_flags);	\
568 	/* next two fields are used to bound the time spent in error handling */
587 	 * in the system at one time, this does not need to be set.  It is
611 	 * In scsi-mq mode, the number of hardware queues supported by the LLD.
624 	 * time being.
647 	/* True if the host uses host-wide tagspace */
716 	dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a)
720 	return (void *)shost->hostdata;  in shost_priv()
728 		if (!dev->parent)  in dev_to_shost()
730 		dev = dev->parent;  in dev_to_shost()
737 	return shost->shost_state == SHOST_RECOVERY ||  in scsi_host_in_recovery()
738 		shost->shost_state == SHOST_CANCEL_RECOVERY ||  in scsi_host_in_recovery()
739 		shost->shost_state == SHOST_DEL_RECOVERY ||  in scsi_host_in_recovery()
740 		shost->tmf_in_progress;  in scsi_host_in_recovery()
769         return shost->shost_gendev.parent;  in scsi_get_device()
773  * scsi_host_scan_allowed - Is scanning of this host allowed
778 	return shost->shost_state == SHOST_RUNNING ||  in scsi_host_scan_allowed()
779 	       shost->shost_state == SHOST_RECOVERY;  in scsi_host_scan_allowed()
796  * thing.  This physical pseudo-device isn't real and won't be available
797  * from any high-level drivers.
827 	shost->prot_capabilities = mask;  in scsi_host_set_prot()
832 	return shost->prot_capabilities;  in scsi_host_get_prot()
837 	return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION;  in scsi_host_prot_dma()
850 	return shost->prot_capabilities & cap[target_type] ? target_type : 0;  in scsi_host_dif_capable()
864 	return shost->prot_capabilities & cap[target_type];  in scsi_host_dix_capable()
870  * All DIX-capable initiators must support the T10-mandated CRC
885 	shost->prot_guard_type = type;  in scsi_host_set_guard()
890 	return shost->prot_guard_type;  in scsi_host_get_guard()