10  * Device mapping and dasd= parameter parsing functions. All devmap
38  * between device number and device index. To find a dasd_devmap_t
39  * that corresponds to a device number of a device index each
41  * the device number and one to search by the device index. As
42  * soon as big minor numbers are available the device index list
43  * can be removed since the device number will then be identical
44  * to the device index.
51 	struct dasd_device *device;  member
129  * Read a device busid/devno from a string.
140 			pr_err("The IPL device is not a CCW device\n");  in dasd_busid()
218 			pr_warning("%*s is not a supported device option\n",  in dasd_feature_list()
304  * as a device number or a range of devices. If the interpretation is
333 		pr_err("%s is not a valid device range\n", parsestring);  in dasd_parse_range()
339 	/* each device in dasd= parameter should be set initially online */  in dasd_parse_range()
370  * keywords and device ranges. When the dasd driver is build into the kernel,
403  * Add a devmap for the device specified by busid. It is possible that
431 		new->device = NULL;  in dasd_add_busid()
442  * Find devmap for device with given bus_id.
473  * Forget all about the device numbers added so far.
485 			BUG_ON(devmap->device != NULL);  in dasd_forget_ranges()
494  * Find the device struct by its device index.
500 	struct dasd_device *device;  in dasd_device_from_devindex()  local
508 				/* Found the devmap for the device. */  in dasd_device_from_devindex()
512 	if (devmap && devmap->device) {  in dasd_device_from_devindex()
513 		device = devmap->device;  in dasd_device_from_devindex()
514 		dasd_get_device(device);  in dasd_device_from_devindex()
516 		device = ERR_PTR(-ENODEV);  in dasd_device_from_devindex()
518 	return device;  in dasd_device_from_devindex()
538  * Create a dasd device structure for cdev.
544 	struct dasd_device *device;  in dasd_create_device()  local
552 	device = dasd_alloc_device();  in dasd_create_device()
553 	if (IS_ERR(device))  in dasd_create_device()
554 		return device;  in dasd_create_device()
555 	atomic_set(&device->ref_count, 3);  in dasd_create_device()
558 	if (!devmap->device) {  in dasd_create_device()
559 		devmap->device = device;  in dasd_create_device()
560 		device->devindex = devmap->devindex;  in dasd_create_device()
561 		device->features = devmap->features;  in dasd_create_device()
563 		device->cdev = cdev;  in dasd_create_device()
571 		dasd_free_device(device);  in dasd_create_device()
576 	dev_set_drvdata(&cdev->dev, device);  in dasd_create_device()
579 	return device;  in dasd_create_device()
588  * Remove a dasd device structure. The passed referenced
592 dasd_delete_device(struct dasd_device *device)  in dasd_delete_device()  argument
598 	/* First remove device pointer from devmap. */  in dasd_delete_device()
599 	devmap = dasd_find_busid(dev_name(&device->cdev->dev));  in dasd_delete_device()
602 	if (devmap->device != device) {  in dasd_delete_device()
604 		dasd_put_device(device);  in dasd_delete_device()
607 	devmap->device = NULL;  in dasd_delete_device()
611 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);  in dasd_delete_device()
612 	dev_set_drvdata(&device->cdev->dev, NULL);  in dasd_delete_device()
613 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);  in dasd_delete_device()
619 	atomic_sub(3, &device->ref_count);  in dasd_delete_device()
622 	wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);  in dasd_delete_device()
625 	cdev = device->cdev;  in dasd_delete_device()
626 	device->cdev = NULL;  in dasd_delete_device()
631 	/* Now the device structure can be freed. */  in dasd_delete_device()
632 	dasd_free_device(device);  in dasd_delete_device()
640 dasd_put_device_wake(struct dasd_device *device)  in dasd_put_device_wake()  argument
648  * This function needs to be called with the ccw device
654 	struct dasd_device *device = dev_get_drvdata(&cdev->dev);  in dasd_device_from_cdev_locked()  local
656 	if (!device)  in dasd_device_from_cdev_locked()
658 	dasd_get_device(device);  in dasd_device_from_cdev_locked()
659 	return device;  in dasd_device_from_cdev_locked()
668 	struct dasd_device *device;  in dasd_device_from_cdev()  local
672 	device = dasd_device_from_cdev_locked(cdev);  in dasd_device_from_cdev()
674 	return device;  in dasd_device_from_cdev()
677 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)  in dasd_add_link_to_gendisk()  argument
681 	devmap = dasd_find_busid(dev_name(&device->cdev->dev));  in dasd_add_link_to_gendisk()
691 	struct dasd_device *device;  in dasd_device_from_gendisk()  local
696 	device = NULL;  in dasd_device_from_gendisk()
699 	if (devmap && devmap->device) {  in dasd_device_from_gendisk()
700 		device = devmap->device;  in dasd_device_from_gendisk()
701 		dasd_get_device(device);  in dasd_device_from_gendisk()
704 	return device;  in dasd_device_from_gendisk()
714 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,  in dasd_ff_show()
728 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,  in dasd_ff_store()
748 	if (devmap->device)  in dasd_ff_store()
749 		devmap->device->features = devmap->features;  in dasd_ff_store()
760 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_ro_show()
774 dasd_ro_store(struct device *dev, struct device_attribute *attr,  in dasd_ro_store()
778 	struct dasd_device *device;  in dasd_ro_store()  local
795 	device = devmap->device;  in dasd_ro_store()
796 	if (device) {  in dasd_ro_store()
797 		device->features = devmap->features;  in dasd_ro_store()
798 		val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);  in dasd_ro_store()
801 	if (device && device->block && device->block->gdp)  in dasd_ro_store()
802 		set_disk_ro(device->block->gdp, val);  in dasd_ro_store()
812 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_erplog_show()
826 dasd_erplog_store(struct device *dev, struct device_attribute *attr,  in dasd_erplog_store()
846 	if (devmap->device)  in dasd_erplog_store()
847 		devmap->device->features = devmap->features;  in dasd_erplog_store()
856  * to talk to the device
859 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_use_diag_show()
873 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,  in dasd_use_diag_store()
892 	if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {  in dasd_use_diag_store()
910 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_use_raw_show()
924 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,  in dasd_use_raw_store()
941 	if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {  in dasd_use_raw_store()
956 dasd_discipline_show(struct device *dev, struct device_attribute *attr,  in dasd_discipline_show()
959 	struct dasd_device *device;  in dasd_discipline_show()  local
962 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_discipline_show()
963 	if (IS_ERR(device))  in dasd_discipline_show()
965 	else if (!device->discipline) {  in dasd_discipline_show()
966 		dasd_put_device(device);  in dasd_discipline_show()
970 			       device->discipline->name);  in dasd_discipline_show()
971 		dasd_put_device(device);  in dasd_discipline_show()
982 dasd_device_status_show(struct device *dev, struct device_attribute *attr,  in dasd_device_status_show()
985 	struct dasd_device *device;  in dasd_device_status_show()  local
988 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_device_status_show()
989 	if (!IS_ERR(device)) {  in dasd_device_status_show()
990 		switch (device->state) {  in dasd_device_status_show()
1013 		dasd_put_device(device);  in dasd_device_status_show()
1021 static ssize_t dasd_alias_show(struct device *dev,  in dasd_alias_show()
1024 	struct dasd_device *device;  in dasd_alias_show()  local
1027 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_alias_show()
1028 	if (IS_ERR(device))  in dasd_alias_show()
1031 	if (device->discipline && device->discipline->get_uid &&  in dasd_alias_show()
1032 	    !device->discipline->get_uid(device, &uid)) {  in dasd_alias_show()
1035 			dasd_put_device(device);  in dasd_alias_show()
1039 	dasd_put_device(device);  in dasd_alias_show()
1046 static ssize_t dasd_vendor_show(struct device *dev,  in dasd_vendor_show()
1049 	struct dasd_device *device;  in dasd_vendor_show()  local
1053 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_vendor_show()
1055 	if (IS_ERR(device))  in dasd_vendor_show()
1058 	if (device->discipline && device->discipline->get_uid &&  in dasd_vendor_show()
1059 	    !device->discipline->get_uid(device, &uid))  in dasd_vendor_show()
1062 	dasd_put_device(device);  in dasd_vendor_show()
1074 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_uid_show()
1076 	struct dasd_device *device;  in dasd_uid_show()  local
1081 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_uid_show()
1083 	if (IS_ERR(device))  in dasd_uid_show()
1086 	if (device->discipline && device->discipline->get_uid &&  in dasd_uid_show()
1087 	    !device->discipline->get_uid(device, &uid)) {  in dasd_uid_show()
1101 			/* should not happen, treat like base device */  in dasd_uid_show()
1117 	dasd_put_device(device);  in dasd_uid_show()
1127 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_eer_show()
1133 	if (!IS_ERR(devmap) && devmap->device)  in dasd_eer_show()
1134 		eer_flag = dasd_eer_enabled(devmap->device);  in dasd_eer_show()
1141 dasd_eer_store(struct device *dev, struct device_attribute *attr,  in dasd_eer_store()
1151 	if (!devmap->device)  in dasd_eer_store()
1159 		rc = dasd_eer_enable(devmap->device);  in dasd_eer_store()
1163 		dasd_eer_disable(devmap->device);  in dasd_eer_store()
1173 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)  in dasd_expires_show()
1175 	struct dasd_device *device;  in dasd_expires_show()  local
1178 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_expires_show()
1179 	if (IS_ERR(device))  in dasd_expires_show()
1181 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);  in dasd_expires_show()
1182 	dasd_put_device(device);  in dasd_expires_show()
1187 dasd_expires_store(struct device *dev, struct device_attribute *attr,  in dasd_expires_store()
1190 	struct dasd_device *device;  in dasd_expires_store()  local
1193 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_expires_store()
1194 	if (IS_ERR(device))  in dasd_expires_store()
1199 		dasd_put_device(device);  in dasd_expires_store()
1204 		device->default_expires = val;  in dasd_expires_store()
1206 	dasd_put_device(device);  in dasd_expires_store()
1212 static ssize_t dasd_reservation_policy_show(struct device *dev,  in dasd_reservation_policy_show()
1233 static ssize_t dasd_reservation_policy_store(struct device *dev,  in dasd_reservation_policy_store()
1251 	if (devmap->device)  in dasd_reservation_policy_store()
1252 		devmap->device->features = devmap->features;  in dasd_reservation_policy_store()
1263 static ssize_t dasd_reservation_state_show(struct device *dev,  in dasd_reservation_state_show()
1267 	struct dasd_device *device;  in dasd_reservation_state_show()  local
1270 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_reservation_state_show()
1271 	if (IS_ERR(device))  in dasd_reservation_state_show()
1274 	if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))  in dasd_reservation_state_show()
1276 	else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))  in dasd_reservation_state_show()
1280 	dasd_put_device(device);  in dasd_reservation_state_show()
1284 static ssize_t dasd_reservation_state_store(struct device *dev,  in dasd_reservation_state_store()
1288 	struct dasd_device *device;  in dasd_reservation_state_store()  local
1291 	device = dasd_device_from_cdev(to_ccwdev(dev));  in dasd_reservation_state_store()
1292 	if (IS_ERR(device))  in dasd_reservation_state_store()
1295 		clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);  in dasd_reservation_state_store()
1298 	dasd_put_device(device);  in dasd_reservation_state_store()
1364 	if (devmap->device)  in dasd_set_feature()
1365 		devmap->device->features = devmap->features;  in dasd_set_feature()