1 // SPDX-License-Identifier: GPL-2.0-only
7  *  generic mid-level SCSI driver
16  *      Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
19  *  add scatter-gather, multiple outstanding request, and other
23  *  support added by Michael Neuffer <mike@i-connect.net>
27  *  Bjorn Ekwall  <bj0rn@blox.se>
36  *  Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
80  * Note - the initial logging level can be set here to log events at boot time.
134 		if (((level > 0) && (cmd->result || disposition != SUCCESS)) ||  in scsi_log_completion()
138 			if (scsi_status_is_check_condition(cmd->result))  in scsi_log_completion()
143 					    scsi_host_busy(cmd->device->host),  in scsi_log_completion()
144 					    cmd->device->host->host_failed);  in scsi_log_completion()
151  * scsi_finish_command - cleanup and pass command back to upper layer
160 	struct scsi_device *sdev = cmd->device;  in scsi_finish_command()
162 	struct Scsi_Host *shost = sdev->host;  in scsi_finish_command()
172 	if (atomic_read(&shost->host_blocked))  in scsi_finish_command()
173 		atomic_set(&shost->host_blocked, 0);  in scsi_finish_command()
174 	if (atomic_read(&starget->target_blocked))  in scsi_finish_command()
175 		atomic_set(&starget->target_blocked, 0);  in scsi_finish_command()
176 	if (atomic_read(&sdev->device_blocked))  in scsi_finish_command()
177 		atomic_set(&sdev->device_blocked, 0);  in scsi_finish_command()
181 				"(result %x)\n", cmd->result));  in scsi_finish_command()
187 		if (drv->done)  in scsi_finish_command()
188 			good_bytes = drv->done(cmd);  in scsi_finish_command()
192 		 * residue if drv->done() error processing indicates no  in scsi_finish_command()
196 			good_bytes -= scsi_get_resid(cmd);  in scsi_finish_command()
207 	return min_t(int, sdev->host->can_queue, 4096);  in scsi_device_max_queue_depth()
211  * scsi_change_queue_depth - change a device's queue depth
219 	if (!sdev->budget_map.map)  in scsi_change_queue_depth()
220 		return -EINVAL;  in scsi_change_queue_depth()
225 		sdev->queue_depth = depth;  in scsi_change_queue_depth()
229 	if (sdev->request_queue)  in scsi_change_queue_depth()
230 		blk_set_queue_depth(sdev->request_queue, depth);  in scsi_change_queue_depth()
232 	sbitmap_resize(&sdev->budget_map, sdev->queue_depth);  in scsi_change_queue_depth()
234 	return sdev->queue_depth;  in scsi_change_queue_depth()
239  * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth
249  * * 0 - No change needed
250  * * >0 - Adjust queue depth to this new depth,
251  * * -1 - Drop back to untagged operation using host->cmd_per_lun as the
261 	if (!sdev->budget_map.map)  in scsi_track_queue_full()
269 	if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4))  in scsi_track_queue_full()
272 	sdev->last_queue_full_time = jiffies;  in scsi_track_queue_full()
273 	if (sdev->last_queue_full_depth != depth) {  in scsi_track_queue_full()
274 		sdev->last_queue_full_count = 1;  in scsi_track_queue_full()
275 		sdev->last_queue_full_depth = depth;  in scsi_track_queue_full()
277 		sdev->last_queue_full_count++;  in scsi_track_queue_full()
280 	if (sdev->last_queue_full_count <= 10)  in scsi_track_queue_full()
288  * scsi_vpd_inquiry - Request a device provide us with a VPD page
306 		return -EINVAL;  in scsi_vpd_inquiry()
322 		return -EIO;  in scsi_vpd_inquiry()
329 		return -EIO;  in scsi_vpd_inquiry()
333 		return -EIO;  in scsi_vpd_inquiry()
348 	if (sdev->no_vpd_size)  in scsi_get_vpd_size()
361 			dev_warn_once(&sdev->sdev_gendev,  in scsi_get_vpd_size()
367 		result -= SCSI_VPD_HEADER_SIZE;  in scsi_get_vpd_size()
382 		dev_warn_once(&sdev->sdev_gendev,  in scsi_get_vpd_size()
392  * scsi_get_vpd_page - Get Vital Product Data from a SCSI device
402  * supported or its content cannot be retrieved, -EINVAL is returned.
410 		return -EINVAL;  in scsi_get_vpd_page()
414 		return -EINVAL;  in scsi_get_vpd_page()
425 		return -EINVAL;  in scsi_get_vpd_page()
427 		dev_warn_once(&sdev->sdev_gendev,  in scsi_get_vpd_page()
436  * scsi_get_vpd_buf - Get Vital Product Data from a SCSI device
460 	result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len);  in scsi_get_vpd_buf()
466 		dev_warn_once(&sdev->sdev_gendev,  in scsi_get_vpd_buf()
474 	vpd_buf->len = result;  in scsi_get_vpd_buf()
488 	mutex_lock(&sdev->inquiry_mutex);  in scsi_update_vpd_page()
490 				      lockdep_is_held(&sdev->inquiry_mutex));  in scsi_update_vpd_page()
491 	mutex_unlock(&sdev->inquiry_mutex);  in scsi_update_vpd_page()
498  * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure
519 	for (i = 4; i < vpd_buf->len; i++) {  in scsi_attach_vpd()
520 		switch (vpd_buf->data[i]) {  in scsi_attach_vpd()
522 			scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0);  in scsi_attach_vpd()
525 			scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80);  in scsi_attach_vpd()
528 			scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83);  in scsi_attach_vpd()
531 			scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89);  in scsi_attach_vpd()
534 			scsi_update_vpd_page(sdev, 0xb0, &sdev->vpd_pgb0);  in scsi_attach_vpd()
537 			scsi_update_vpd_page(sdev, 0xb1, &sdev->vpd_pgb1);  in scsi_attach_vpd()
540 			scsi_update_vpd_page(sdev, 0xb2, &sdev->vpd_pgb2);  in scsi_attach_vpd()
543 			scsi_update_vpd_page(sdev, 0xb7, &sdev->vpd_pgb7);  in scsi_attach_vpd()
553  * scsi_report_opcode - Find out if a given command is supported
562  * have a service action, @sa must be 0. Returns -EINVAL if RSOC fails,
577 	if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3)  in scsi_report_opcode()
578 		return -EINVAL;  in scsi_report_opcode()
583 		dev_warn_once(&sdev->sdev_gendev,  in scsi_report_opcode()
584 			      "%s: len %u bytes, opcode 0x%02x needs %u\n",  in scsi_report_opcode()
586 		return -EINVAL;  in scsi_report_opcode()
610 		return -EINVAL;  in scsi_report_opcode()
636 	 * See SPC-6, One_command parameter data format for  in scsi_cdl_check_cmd()
639 	 *  - rwcdlp == 0: then cdlp indicates support for the A mode page when  in scsi_cdl_check_cmd()
642 	 *  - rwcdlp == 1: then cdlp indicates support for the T2A mode page  in scsi_cdl_check_cmd()
654  * scsi_cdl_check - Check if a SCSI device supports Command Duration Limits
663 	 * Support for CDL was defined in SPC-5. Ignore devices reporting an  in scsi_cdl_check()
668 	if (sdev->scsi_level < SCSI_SPC_5) {  in scsi_cdl_check()
669 		sdev->cdl_supported = 0;  in scsi_cdl_check()
675 		sdev->cdl_supported = 0;  in scsi_cdl_check()
691 		sdev->use_16_for_rw = 1;  in scsi_cdl_check()
692 		sdev->use_10_for_rw = 0;  in scsi_cdl_check()
694 		sdev->cdl_supported = 1;  in scsi_cdl_check()
701 		scsi_cdl_enable(sdev, sdev->cdl_enable);  in scsi_cdl_check()
703 		sdev->cdl_supported = 0;  in scsi_cdl_check()
710  * scsi_cdl_enable - Enable or disable a SCSI device supports for Command
720 	if (!sdev->cdl_supported)  in scsi_cdl_enable()
721 		return -EOPNOTSUPP;  in scsi_cdl_enable()
726 	if (sdev->is_ata) {  in scsi_cdl_enable()
735 			return -EINVAL;  in scsi_cdl_enable()
739 			    data.length - data.header_length -  in scsi_cdl_enable()
767 					dev_name(&sdev->sdev_gendev), &sshdr);  in scsi_cdl_enable()
773 	sdev->cdl_enable = enable;  in scsi_cdl_enable()
779  * scsi_device_get  -  get an additional reference to a scsi_device
791 	if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)  in scsi_device_get()
793 	if (!try_module_get(sdev->host->hostt->module))  in scsi_device_get()
795 	if (!get_device(&sdev->sdev_gendev))  in scsi_device_get()
800 	module_put(sdev->host->hostt->module);  in scsi_device_get()
802 	return -ENXIO;  in scsi_device_get()
807  * scsi_device_put  -  release a reference to a scsi_device
816 	struct module *mod = sdev->host->hostt->module;  in scsi_device_put()
818 	put_device(&sdev->sdev_gendev);  in scsi_device_put()
827 	struct list_head *list = (prev ? &prev->siblings : &shost->__devices);  in __scsi_iterate_devices()
831 	spin_lock_irqsave(shost->host_lock, flags);  in __scsi_iterate_devices()
832 	while (list->next != &shost->__devices) {  in __scsi_iterate_devices()
833 		next = list_entry(list->next, struct scsi_device, siblings);  in __scsi_iterate_devices()
841 		list = list->next;  in __scsi_iterate_devices()
843 	spin_unlock_irqrestore(shost->host_lock, flags);  in __scsi_iterate_devices()
852  * starget_for_each_device  -  helper to walk all devices of a target
864 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in starget_for_each_device()
868 		if ((sdev->channel == starget->channel) &&  in starget_for_each_device()
869 		    (sdev->id == starget->id))  in starget_for_each_device()
876  * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED)
883  * protected by shost->host_lock.
892 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in __starget_for_each_device()
896 		if ((sdev->channel == starget->channel) &&  in __starget_for_each_device()
897 		    (sdev->id == starget->id))  in __starget_for_each_device()
904  * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED)
923 	list_for_each_entry(sdev, &starget->devices, same_target_siblings) {  in __scsi_device_lookup_by_target()
924 		if (sdev->sdev_state == SDEV_DEL)  in __scsi_device_lookup_by_target()
926 		if (sdev->lun ==lun)  in __scsi_device_lookup_by_target()
935  * scsi_device_lookup_by_target - find a device given the target
947 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in scsi_device_lookup_by_target()
950 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_device_lookup_by_target()
954 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_device_lookup_by_target()
961  * __scsi_device_lookup - find a device given the host (UNLOCKED)
981 	list_for_each_entry(sdev, &shost->__devices, siblings) {  in __scsi_device_lookup()
982 		if (sdev->sdev_state == SDEV_DEL)  in __scsi_device_lookup()
984 		if (sdev->channel == channel && sdev->id == id &&  in __scsi_device_lookup()
985 				sdev->lun ==lun)  in __scsi_device_lookup()
994  * scsi_device_lookup - find a device given the host
1010 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_device_lookup()
1014 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_device_lookup()
1062 	       -error);  in init_scsi()