1 // SPDX-License-Identifier: GPL-2.0
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999,2001
10 * Device mapping and dasd= parameter parsing functions. All devmap
11 * functions may not be called from interrupt context. In particular
12 * dasd_get_device is a no-no from interrupt context.
16 #define KMSG_COMPONENT "dasd"
18 #include <linux/ctype.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
23 #include <asm/debug.h>
24 #include <linux/uaccess.h>
28 #define PRINTK_HEADER "dasd_devmap:"
29 #define DASD_BUS_ID_SIZE 20
30 #define DASD_MAX_PARAMS 256
34 struct kmem_cache *dasd_page_cache;
35 EXPORT_SYMBOL_GPL(dasd_page_cache);
38 * dasd_devmap_t is used to store the features and the relation
39 * between device number and device index. To find a dasd_devmap_t
40 * that corresponds to a device number of a device index each
41 * dasd_devmap_t is added to two linked lists, one to search by
42 * the device number and one to search by the device index. As
43 * soon as big minor numbers are available the device index list
44 * can be removed since the device number will then be identical
45 * to the device index.
48 struct list_head list;
49 char bus_id[DASD_BUS_ID_SIZE];
50 unsigned int devindex;
51 unsigned short features;
52 struct dasd_device *device;
56 * Parameter parsing functions for dasd= parameter. The syntax is:
57 * <devno> : (0x)?[0-9a-fA-F]+
58 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
60 * <feature_list> : \(<feature>(:<feature>)*\)
61 * <devno-range> : <devno>(-<devno>)?<feature_list>?
62 * <busid-range> : <busid>(-<busid>)?<feature_list>?
63 * <devices> : <devno-range>|<busid-range>
64 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
66 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
69 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
70 int dasd_autodetect = 0; /* is true, when autodetection is active */
71 int dasd_nopav = 0; /* is true, when PAV is disabled */
72 EXPORT_SYMBOL_GPL(dasd_nopav);
73 int dasd_nofcx; /* disable High Performance Ficon */
74 EXPORT_SYMBOL_GPL(dasd_nofcx);
77 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
78 * it is named 'dasd' to directly be filled by insmod with the comma separated
79 * strings when running as a module.
81 static char *dasd[DASD_MAX_PARAMS];
82 module_param_array(dasd, charp, NULL, S_IRUGO);
85 * Single spinlock to protect devmap and servermap structures and lists.
87 static DEFINE_SPINLOCK(dasd_devmap_lock);
90 * Hash lists for devmap structures.
92 static struct list_head dasd_hashlists[256];
93 int dasd_max_devindex;
95 static struct dasd_devmap *dasd_add_busid(const char *, int);
98 dasd_hash_busid(const char *bus_id)
103 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
109 static int __init dasd_call_setup(char *opt)
111 static int i __initdata;
114 while (i < DASD_MAX_PARAMS) {
115 tmp = strsep(&opt, ",");
125 __setup ("dasd=", dasd_call_setup);
126 #endif /* #ifndef MODULE */
128 #define DASD_IPLDEV "ipldev"
131 * Read a device busid/devno from a string.
133 static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
138 /* Interpret ipldev busid */
139 if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) {
140 if (ipl_info.type != IPL_TYPE_CCW) {
141 pr_err("The IPL device is not a CCW device\n");
145 *id1 = ipl_info.data.ccw.dev_id.ssid;
146 *devno = ipl_info.data.ccw.dev_id.devno;
151 /* Old style 0xXXXX or XXXX */
152 if (!kstrtouint(str, 16, &val)) {
160 /* New style x.y.z busid */
161 tok = strsep(&str, ".");
162 if (kstrtouint(tok, 16, &val) || val > 0xff)
166 tok = strsep(&str, ".");
167 if (kstrtouint(tok, 16, &val) || val > 0xff)
171 tok = strsep(&str, ".");
172 if (kstrtouint(tok, 16, &val) || val > 0xffff)
180 * Read colon separated list of dasd features.
182 static int __init dasd_feature_list(char *str)
184 int features, len, rc;
190 return DASD_FEATURE_DEFAULT;
194 str[len] && str[len] != ':' && str[len] != ')'; len++);
195 if (len == 2 && !strncmp(str, "ro", 2))
196 features |= DASD_FEATURE_READONLY;
197 else if (len == 4 && !strncmp(str, "diag", 4))
198 features |= DASD_FEATURE_USEDIAG;
199 else if (len == 3 && !strncmp(str, "raw", 3))
200 features |= DASD_FEATURE_USERAW;
201 else if (len == 6 && !strncmp(str, "erplog", 6))
202 features |= DASD_FEATURE_ERPLOG;
203 else if (len == 8 && !strncmp(str, "failfast", 8))
204 features |= DASD_FEATURE_FAILFAST;
206 pr_warn("%.*s is not a supported device option\n",
216 return rc ? : features;
220 * Try to match the first element on the comma separated parse string
221 * with one of the known keywords. If a keyword is found, take the approprate
222 * action and return a pointer to the residual string. If the first element
223 * could not be matched to any keyword then return an error code.
225 static int __init dasd_parse_keyword(char *keyword)
227 int length = strlen(keyword);
229 if (strncmp("autodetect", keyword, length) == 0) {
231 pr_info("The autodetection mode has been activated\n");
234 if (strncmp("probeonly", keyword, length) == 0) {
236 pr_info("The probeonly mode has been activated\n");
239 if (strncmp("nopav", keyword, length) == 0) {
241 pr_info("'nopav' is not supported on z/VM\n");
244 pr_info("PAV support has be deactivated\n");
248 if (strncmp("nofcx", keyword, length) == 0) {
250 pr_info("High Performance FICON support has been "
254 if (strncmp("fixedbuffers", keyword, length) == 0) {
258 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
259 PAGE_SIZE, SLAB_CACHE_DMA,
261 if (!dasd_page_cache)
262 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
263 "fixed buffer mode disabled.");
265 DBF_EVENT(DBF_INFO, "%s",
266 "turning on fixed buffer mode");
274 * Split a string of a device range into its pieces and return the from, to, and
275 * feature parts separately.
277 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
278 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
279 * 0x4321 -> from: 0x4321 to: null features: null
281 static int __init dasd_evaluate_range_param(char *range, char **from_str,
282 char **to_str, char **features_str)
286 /* Do we have a range or a single device? */
287 if (strchr(range, '-')) {
288 *from_str = strsep(&range, "-");
289 *to_str = strsep(&range, "(");
290 *features_str = strsep(&range, ")");
292 *from_str = strsep(&range, "(");
293 *features_str = strsep(&range, ")");
296 if (*features_str && !range) {
297 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
305 * Try to interprete the range string as a device number or a range of devices.
306 * If the interpretation is successful, create the matching dasd_devmap entries.
307 * If interpretation fails or in case of an error, return an error code.
309 static int __init dasd_parse_range(const char *range)
311 struct dasd_devmap *devmap;
312 int from, from_id0, from_id1;
313 int to, to_id0, to_id1;
315 char bus_id[DASD_BUS_ID_SIZE + 1];
316 char *features_str = NULL;
317 char *from_str = NULL;
322 tmp = kstrdup(range, GFP_KERNEL);
326 if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) {
331 if (dasd_busid(from_str, &from_id0, &from_id1, &from)) {
340 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) {
344 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) {
345 pr_err("%s is not a valid device range\n", range);
351 features = dasd_feature_list(features_str);
356 /* each device in dasd= parameter should be set initially online */
357 features |= DASD_FEATURE_INITIAL_ONLINE;
359 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
360 devmap = dasd_add_busid(bus_id, features);
361 if (IS_ERR(devmap)) {
362 rc = PTR_ERR(devmap);
374 * Parse parameters stored in dasd[]
375 * The 'dasd=...' parameter allows to specify a comma separated list of
376 * keywords and device ranges. The parameters in that list will be stored as
377 * separate elementes in dasd[].
379 int __init dasd_parse(void)
385 for (i = 0; i < DASD_MAX_PARAMS; i++) {
392 rc = dasd_parse_keyword(cur);
394 rc = dasd_parse_range(cur);
404 * Add a devmap for the device specified by busid. It is possible that
405 * the devmap already exists (dasd= parameter). The order of the devices
406 * added through this function will define the kdevs for the individual
409 static struct dasd_devmap *
410 dasd_add_busid(const char *bus_id, int features)
412 struct dasd_devmap *devmap, *new, *tmp;
415 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
417 return ERR_PTR(-ENOMEM);
418 spin_lock(&dasd_devmap_lock);
420 hash = dasd_hash_busid(bus_id);
421 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
422 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
427 /* This bus_id is new. */
428 new->devindex = dasd_max_devindex++;
429 strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
430 new->features = features;
432 list_add(&new->list, &dasd_hashlists[hash]);
436 spin_unlock(&dasd_devmap_lock);
442 * Find devmap for device with given bus_id.
444 static struct dasd_devmap *
445 dasd_find_busid(const char *bus_id)
447 struct dasd_devmap *devmap, *tmp;
450 spin_lock(&dasd_devmap_lock);
451 devmap = ERR_PTR(-ENODEV);
452 hash = dasd_hash_busid(bus_id);
453 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
454 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
459 spin_unlock(&dasd_devmap_lock);
464 * Check if busid has been added to the list of dasd ranges.
467 dasd_busid_known(const char *bus_id)
469 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
473 * Forget all about the device numbers added so far.
474 * This may only be called at module unload or system shutdown.
477 dasd_forget_ranges(void)
479 struct dasd_devmap *devmap, *n;
482 spin_lock(&dasd_devmap_lock);
483 for (i = 0; i < 256; i++) {
484 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
485 BUG_ON(devmap->device != NULL);
486 list_del(&devmap->list);
490 spin_unlock(&dasd_devmap_lock);
494 * Find the device struct by its device index.
497 dasd_device_from_devindex(int devindex)
499 struct dasd_devmap *devmap, *tmp;
500 struct dasd_device *device;
503 spin_lock(&dasd_devmap_lock);
505 for (i = 0; (i < 256) && !devmap; i++)
506 list_for_each_entry(tmp, &dasd_hashlists[i], list)
507 if (tmp->devindex == devindex) {
508 /* Found the devmap for the device. */
512 if (devmap && devmap->device) {
513 device = devmap->device;
514 dasd_get_device(device);
516 device = ERR_PTR(-ENODEV);
517 spin_unlock(&dasd_devmap_lock);
522 * Return devmap for cdev. If no devmap exists yet, create one and
523 * connect it to the cdev.
525 static struct dasd_devmap *
526 dasd_devmap_from_cdev(struct ccw_device *cdev)
528 struct dasd_devmap *devmap;
530 devmap = dasd_find_busid(dev_name(&cdev->dev));
532 devmap = dasd_add_busid(dev_name(&cdev->dev),
533 DASD_FEATURE_DEFAULT);
538 * Create a dasd device structure for cdev.
541 dasd_create_device(struct ccw_device *cdev)
543 struct dasd_devmap *devmap;
544 struct dasd_device *device;
548 devmap = dasd_devmap_from_cdev(cdev);
550 return (void *) devmap;
552 device = dasd_alloc_device();
555 atomic_set(&device->ref_count, 3);
557 spin_lock(&dasd_devmap_lock);
558 if (!devmap->device) {
559 devmap->device = device;
560 device->devindex = devmap->devindex;
561 device->features = devmap->features;
562 get_device(&cdev->dev);
566 /* Someone else was faster. */
568 spin_unlock(&dasd_devmap_lock);
571 dasd_free_device(device);
575 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
576 dev_set_drvdata(&cdev->dev, device);
577 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
583 * Wait queue for dasd_delete_device waits.
585 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
588 * Remove a dasd device structure. The passed referenced
592 dasd_delete_device(struct dasd_device *device)
594 struct ccw_device *cdev;
595 struct dasd_devmap *devmap;
598 /* First remove device pointer from devmap. */
599 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
600 BUG_ON(IS_ERR(devmap));
601 spin_lock(&dasd_devmap_lock);
602 if (devmap->device != device) {
603 spin_unlock(&dasd_devmap_lock);
604 dasd_put_device(device);
607 devmap->device = NULL;
608 spin_unlock(&dasd_devmap_lock);
610 /* Disconnect dasd_device structure from ccw_device structure. */
611 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
612 dev_set_drvdata(&device->cdev->dev, NULL);
613 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
616 * Drop ref_count by 3, one for the devmap reference, one for
617 * the cdev reference and one for the passed reference.
619 atomic_sub(3, &device->ref_count);
621 /* Wait for reference counter to drop to zero. */
622 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
624 dasd_generic_free_discipline(device);
625 /* Disconnect dasd_device structure from ccw_device structure. */
629 /* Put ccw_device structure. */
630 put_device(&cdev->dev);
632 /* Now the device structure can be freed. */
633 dasd_free_device(device);
637 * Reference counter dropped to zero. Wake up waiter
638 * in dasd_delete_device.
641 dasd_put_device_wake(struct dasd_device *device)
643 wake_up(&dasd_delete_wq);
645 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
648 * Return dasd_device structure associated with cdev.
649 * This function needs to be called with the ccw device
650 * lock held. It can be used from interrupt context.
653 dasd_device_from_cdev_locked(struct ccw_device *cdev)
655 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
658 return ERR_PTR(-ENODEV);
659 dasd_get_device(device);
664 * Return dasd_device structure associated with cdev.
667 dasd_device_from_cdev(struct ccw_device *cdev)
669 struct dasd_device *device;
672 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
673 device = dasd_device_from_cdev_locked(cdev);
674 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
678 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
680 struct dasd_devmap *devmap;
682 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
685 spin_lock(&dasd_devmap_lock);
686 gdp->private_data = devmap;
687 spin_unlock(&dasd_devmap_lock);
690 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
692 struct dasd_device *device;
693 struct dasd_devmap *devmap;
695 if (!gdp->private_data)
698 spin_lock(&dasd_devmap_lock);
699 devmap = gdp->private_data;
700 if (devmap && devmap->device) {
701 device = devmap->device;
702 dasd_get_device(device);
704 spin_unlock(&dasd_devmap_lock);
709 * SECTION: files in sysfs
713 * failfast controls the behaviour, if no path is available
715 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
718 struct dasd_devmap *devmap;
721 devmap = dasd_find_busid(dev_name(dev));
723 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
725 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
726 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
729 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
730 const char *buf, size_t count)
735 if (kstrtouint(buf, 0, &val) || val > 1)
738 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
743 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
746 * readonly controls the readonly status of a dasd
749 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
751 struct dasd_devmap *devmap;
752 struct dasd_device *device;
755 devmap = dasd_find_busid(dev_name(dev));
759 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
761 spin_lock(&dasd_devmap_lock);
762 device = devmap->device;
764 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
765 spin_unlock(&dasd_devmap_lock);
768 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
773 const char *buf, size_t count)
775 struct ccw_device *cdev = to_ccwdev(dev);
776 struct dasd_device *device;
781 if (kstrtouint(buf, 0, &val) || val > 1)
784 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
788 device = dasd_device_from_cdev(cdev);
792 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
793 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
795 if (!device->block || !device->block->gdp ||
796 test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
797 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
800 /* Increase open_count to avoid losing the block device */
801 atomic_inc(&device->block->open_count);
802 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
804 set_disk_ro(device->block->gdp, val);
805 atomic_dec(&device->block->open_count);
808 dasd_put_device(device);
813 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
815 * erplog controls the logging of ERP related data
816 * (e.g. failing channel programs).
819 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
821 struct dasd_devmap *devmap;
824 devmap = dasd_find_busid(dev_name(dev));
826 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
828 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
829 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
833 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
834 const char *buf, size_t count)
839 if (kstrtouint(buf, 0, &val) || val > 1)
842 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
847 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
850 * use_diag controls whether the driver should use diag rather than ssch
851 * to talk to the device
854 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
856 struct dasd_devmap *devmap;
859 devmap = dasd_find_busid(dev_name(dev));
861 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
863 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
864 return sprintf(buf, use_diag ? "1\n" : "0\n");
868 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
869 const char *buf, size_t count)
871 struct dasd_devmap *devmap;
875 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
877 return PTR_ERR(devmap);
879 if (kstrtouint(buf, 0, &val) || val > 1)
882 spin_lock(&dasd_devmap_lock);
883 /* Changing diag discipline flag is only allowed in offline state. */
885 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
887 devmap->features |= DASD_FEATURE_USEDIAG;
889 devmap->features &= ~DASD_FEATURE_USEDIAG;
892 spin_unlock(&dasd_devmap_lock);
896 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
899 * use_raw controls whether the driver should give access to raw eckd data or
900 * operate in standard mode
903 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
905 struct dasd_devmap *devmap;
908 devmap = dasd_find_busid(dev_name(dev));
910 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
912 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
913 return sprintf(buf, use_raw ? "1\n" : "0\n");
917 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
918 const char *buf, size_t count)
920 struct dasd_devmap *devmap;
924 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
926 return PTR_ERR(devmap);
928 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
931 spin_lock(&dasd_devmap_lock);
932 /* Changing diag discipline flag is only allowed in offline state. */
934 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
936 devmap->features |= DASD_FEATURE_USERAW;
938 devmap->features &= ~DASD_FEATURE_USERAW;
941 spin_unlock(&dasd_devmap_lock);
945 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
949 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
950 const char *buf, size_t count)
952 struct ccw_device *cdev = to_ccwdev(dev);
953 struct dasd_device *device;
957 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
958 device = dasd_device_from_cdev_locked(cdev);
959 if (IS_ERR(device)) {
960 rc = PTR_ERR(device);
961 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
965 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
966 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
967 /* Already doing offline processing */
968 dasd_put_device(device);
969 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
974 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
975 dasd_put_device(device);
976 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
978 rc = ccw_device_set_offline(cdev);
981 return rc ? rc : count;
984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
987 dasd_access_show(struct device *dev, struct device_attribute *attr,
990 struct ccw_device *cdev = to_ccwdev(dev);
991 struct dasd_device *device;
994 device = dasd_device_from_cdev(cdev);
996 return PTR_ERR(device);
998 if (!device->discipline)
1000 else if (!device->discipline->host_access_count)
1001 count = -EOPNOTSUPP;
1003 count = device->discipline->host_access_count(device);
1005 dasd_put_device(device);
1009 return sprintf(buf, "%d\n", count);
1012 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1015 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1018 struct dasd_device *device;
1021 device = dasd_device_from_cdev(to_ccwdev(dev));
1024 else if (!device->discipline) {
1025 dasd_put_device(device);
1028 len = snprintf(buf, PAGE_SIZE, "%s\n",
1029 device->discipline->name);
1030 dasd_put_device(device);
1034 len = snprintf(buf, PAGE_SIZE, "none\n");
1038 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1041 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1044 struct dasd_device *device;
1047 device = dasd_device_from_cdev(to_ccwdev(dev));
1048 if (!IS_ERR(device)) {
1049 switch (device->state) {
1050 case DASD_STATE_NEW:
1051 len = snprintf(buf, PAGE_SIZE, "new\n");
1053 case DASD_STATE_KNOWN:
1054 len = snprintf(buf, PAGE_SIZE, "detected\n");
1056 case DASD_STATE_BASIC:
1057 len = snprintf(buf, PAGE_SIZE, "basic\n");
1059 case DASD_STATE_UNFMT:
1060 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1062 case DASD_STATE_READY:
1063 len = snprintf(buf, PAGE_SIZE, "ready\n");
1065 case DASD_STATE_ONLINE:
1066 len = snprintf(buf, PAGE_SIZE, "online\n");
1069 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1072 dasd_put_device(device);
1074 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1078 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1080 static ssize_t dasd_alias_show(struct device *dev,
1081 struct device_attribute *attr, char *buf)
1083 struct dasd_device *device;
1084 struct dasd_uid uid;
1086 device = dasd_device_from_cdev(to_ccwdev(dev));
1088 return sprintf(buf, "0\n");
1090 if (device->discipline && device->discipline->get_uid &&
1091 !device->discipline->get_uid(device, &uid)) {
1092 if (uid.type == UA_BASE_PAV_ALIAS ||
1093 uid.type == UA_HYPER_PAV_ALIAS) {
1094 dasd_put_device(device);
1095 return sprintf(buf, "1\n");
1098 dasd_put_device(device);
1100 return sprintf(buf, "0\n");
1103 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1105 static ssize_t dasd_vendor_show(struct device *dev,
1106 struct device_attribute *attr, char *buf)
1108 struct dasd_device *device;
1109 struct dasd_uid uid;
1112 device = dasd_device_from_cdev(to_ccwdev(dev));
1115 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1117 if (device->discipline && device->discipline->get_uid &&
1118 !device->discipline->get_uid(device, &uid))
1119 vendor = uid.vendor;
1121 dasd_put_device(device);
1123 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1126 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1128 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1129 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1133 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1135 struct dasd_device *device;
1136 struct dasd_uid uid;
1137 char uid_string[UID_STRLEN];
1140 device = dasd_device_from_cdev(to_ccwdev(dev));
1143 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1145 if (device->discipline && device->discipline->get_uid &&
1146 !device->discipline->get_uid(device, &uid)) {
1148 case UA_BASE_DEVICE:
1149 snprintf(ua_string, sizeof(ua_string), "%02x",
1150 uid.real_unit_addr);
1152 case UA_BASE_PAV_ALIAS:
1153 snprintf(ua_string, sizeof(ua_string), "%02x",
1154 uid.base_unit_addr);
1156 case UA_HYPER_PAV_ALIAS:
1157 snprintf(ua_string, sizeof(ua_string), "xx");
1160 /* should not happen, treat like base device */
1161 snprintf(ua_string, sizeof(ua_string), "%02x",
1162 uid.real_unit_addr);
1166 if (strlen(uid.vduit) > 0)
1167 snprintf(uid_string, sizeof(uid_string),
1169 uid.vendor, uid.serial, uid.ssid, ua_string,
1172 snprintf(uid_string, sizeof(uid_string),
1174 uid.vendor, uid.serial, uid.ssid, ua_string);
1176 dasd_put_device(device);
1178 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1180 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1183 * extended error-reporting
1186 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1188 struct dasd_devmap *devmap;
1191 devmap = dasd_find_busid(dev_name(dev));
1192 if (!IS_ERR(devmap) && devmap->device)
1193 eer_flag = dasd_eer_enabled(devmap->device);
1196 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1200 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1201 const char *buf, size_t count)
1203 struct dasd_device *device;
1207 device = dasd_device_from_cdev(to_ccwdev(dev));
1209 return PTR_ERR(device);
1211 if (kstrtouint(buf, 0, &val) || val > 1)
1215 rc = dasd_eer_enable(device);
1217 dasd_eer_disable(device);
1219 dasd_put_device(device);
1221 return rc ? : count;
1224 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1227 * expiration time for default requests
1230 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1232 struct dasd_device *device;
1235 device = dasd_device_from_cdev(to_ccwdev(dev));
1238 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1239 dasd_put_device(device);
1244 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1245 const char *buf, size_t count)
1247 struct dasd_device *device;
1250 device = dasd_device_from_cdev(to_ccwdev(dev));
1254 if ((kstrtoul(buf, 10, &val) != 0) ||
1255 (val > DASD_EXPIRES_MAX) || val == 0) {
1256 dasd_put_device(device);
1261 device->default_expires = val;
1263 dasd_put_device(device);
1267 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1270 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1272 struct dasd_device *device;
1275 device = dasd_device_from_cdev(to_ccwdev(dev));
1278 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1279 dasd_put_device(device);
1284 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1285 const char *buf, size_t count)
1287 struct dasd_device *device;
1290 device = dasd_device_from_cdev(to_ccwdev(dev));
1294 if ((kstrtoul(buf, 10, &val) != 0) ||
1295 (val > DASD_RETRIES_MAX)) {
1296 dasd_put_device(device);
1301 device->default_retries = val;
1303 dasd_put_device(device);
1307 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1310 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1313 struct dasd_device *device;
1316 device = dasd_device_from_cdev(to_ccwdev(dev));
1319 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1320 dasd_put_device(device);
1325 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1326 const char *buf, size_t count)
1328 struct dasd_device *device;
1329 struct request_queue *q;
1332 device = dasd_device_from_cdev(to_ccwdev(dev));
1333 if (IS_ERR(device) || !device->block)
1336 if ((kstrtoul(buf, 10, &val) != 0) ||
1337 val > UINT_MAX / HZ) {
1338 dasd_put_device(device);
1341 q = device->block->request_queue;
1343 dasd_put_device(device);
1347 device->blk_timeout = val;
1349 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1351 dasd_put_device(device);
1355 static DEVICE_ATTR(timeout, 0644,
1356 dasd_timeout_show, dasd_timeout_store);
1360 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1361 const char *buf, size_t count)
1363 struct dasd_device *device;
1366 device = dasd_device_from_cdev(to_ccwdev(dev));
1370 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1373 if (device->discipline && device->discipline->reset_path)
1374 device->discipline->reset_path(device, (__u8) val);
1376 dasd_put_device(device);
1380 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1382 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1385 struct dasd_device *device;
1388 device = dasd_device_from_cdev(to_ccwdev(dev));
1391 if (!device->discipline || !device->discipline->hpf_enabled) {
1392 dasd_put_device(device);
1393 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1395 hpf = device->discipline->hpf_enabled(device);
1396 dasd_put_device(device);
1397 return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1400 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1402 static ssize_t dasd_reservation_policy_show(struct device *dev,
1403 struct device_attribute *attr,
1406 struct dasd_devmap *devmap;
1409 devmap = dasd_find_busid(dev_name(dev));
1410 if (IS_ERR(devmap)) {
1411 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1413 spin_lock(&dasd_devmap_lock);
1414 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1415 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1417 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1418 spin_unlock(&dasd_devmap_lock);
1423 static ssize_t dasd_reservation_policy_store(struct device *dev,
1424 struct device_attribute *attr,
1425 const char *buf, size_t count)
1427 struct ccw_device *cdev = to_ccwdev(dev);
1430 if (sysfs_streq("ignore", buf))
1431 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1432 else if (sysfs_streq("fail", buf))
1433 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1437 return rc ? : count;
1440 static DEVICE_ATTR(reservation_policy, 0644,
1441 dasd_reservation_policy_show, dasd_reservation_policy_store);
1443 static ssize_t dasd_reservation_state_show(struct device *dev,
1444 struct device_attribute *attr,
1447 struct dasd_device *device;
1450 device = dasd_device_from_cdev(to_ccwdev(dev));
1452 return snprintf(buf, PAGE_SIZE, "none\n");
1454 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1455 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1456 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1457 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1459 rc = snprintf(buf, PAGE_SIZE, "none\n");
1460 dasd_put_device(device);
1464 static ssize_t dasd_reservation_state_store(struct device *dev,
1465 struct device_attribute *attr,
1466 const char *buf, size_t count)
1468 struct dasd_device *device;
1471 device = dasd_device_from_cdev(to_ccwdev(dev));
1474 if (sysfs_streq("reset", buf))
1475 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1478 dasd_put_device(device);
1486 static DEVICE_ATTR(last_known_reservation_state, 0644,
1487 dasd_reservation_state_show, dasd_reservation_state_store);
1489 static ssize_t dasd_pm_show(struct device *dev,
1490 struct device_attribute *attr, char *buf)
1492 struct dasd_device *device;
1493 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1495 device = dasd_device_from_cdev(to_ccwdev(dev));
1497 return sprintf(buf, "0\n");
1499 opm = dasd_path_get_opm(device);
1500 nppm = dasd_path_get_nppm(device);
1501 cablepm = dasd_path_get_cablepm(device);
1502 cuirpm = dasd_path_get_cuirpm(device);
1503 hpfpm = dasd_path_get_hpfpm(device);
1504 ifccpm = dasd_path_get_ifccpm(device);
1505 dasd_put_device(device);
1507 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1508 cablepm, cuirpm, hpfpm, ifccpm);
1511 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1514 * threshold value for IFCC/CCC errors
1517 dasd_path_threshold_show(struct device *dev,
1518 struct device_attribute *attr, char *buf)
1520 struct dasd_device *device;
1523 device = dasd_device_from_cdev(to_ccwdev(dev));
1526 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1527 dasd_put_device(device);
1532 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1533 const char *buf, size_t count)
1535 struct dasd_device *device;
1536 unsigned long flags;
1539 device = dasd_device_from_cdev(to_ccwdev(dev));
1543 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
1544 dasd_put_device(device);
1547 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1548 device->path_thrhld = val;
1549 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1550 dasd_put_device(device);
1553 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1554 dasd_path_threshold_store);
1557 * configure if path is disabled after IFCC/CCC error threshold is
1561 dasd_path_autodisable_show(struct device *dev,
1562 struct device_attribute *attr, char *buf)
1564 struct dasd_devmap *devmap;
1567 devmap = dasd_find_busid(dev_name(dev));
1568 if (!IS_ERR(devmap))
1569 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
1571 flag = (DASD_FEATURE_DEFAULT &
1572 DASD_FEATURE_PATH_AUTODISABLE) != 0;
1573 return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n");
1577 dasd_path_autodisable_store(struct device *dev,
1578 struct device_attribute *attr,
1579 const char *buf, size_t count)
1584 if (kstrtouint(buf, 0, &val) || val > 1)
1587 rc = dasd_set_feature(to_ccwdev(dev),
1588 DASD_FEATURE_PATH_AUTODISABLE, val);
1590 return rc ? : count;
1593 static DEVICE_ATTR(path_autodisable, 0644,
1594 dasd_path_autodisable_show,
1595 dasd_path_autodisable_store);
1597 * interval for IFCC/CCC checks
1598 * meaning time with no IFCC/CCC error before the error counter
1602 dasd_path_interval_show(struct device *dev,
1603 struct device_attribute *attr, char *buf)
1605 struct dasd_device *device;
1608 device = dasd_device_from_cdev(to_ccwdev(dev));
1611 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1612 dasd_put_device(device);
1617 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1618 const char *buf, size_t count)
1620 struct dasd_device *device;
1621 unsigned long flags;
1624 device = dasd_device_from_cdev(to_ccwdev(dev));
1628 if ((kstrtoul(buf, 10, &val) != 0) ||
1629 (val > DASD_INTERVAL_MAX) || val == 0) {
1630 dasd_put_device(device);
1633 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1635 device->path_interval = val;
1636 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1637 dasd_put_device(device);
1641 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1642 dasd_path_interval_store);
1645 #define DASD_DEFINE_ATTR(_name, _func) \
1646 static ssize_t dasd_##_name##_show(struct device *dev, \
1647 struct device_attribute *attr, \
1650 struct ccw_device *cdev = to_ccwdev(dev); \
1651 struct dasd_device *device = dasd_device_from_cdev(cdev); \
1654 if (IS_ERR(device)) \
1656 if (device->discipline && _func) \
1657 val = _func(device); \
1658 dasd_put_device(device); \
1660 return snprintf(buf, PAGE_SIZE, "%d\n", val); \
1662 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \
1664 DASD_DEFINE_ATTR(ese, device->discipline->is_ese);
1665 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size);
1666 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id);
1667 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured);
1668 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated);
1669 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity);
1670 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld);
1671 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel);
1672 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos);
1674 static struct attribute * dasd_attrs[] = {
1675 &dev_attr_readonly.attr,
1676 &dev_attr_discipline.attr,
1677 &dev_attr_status.attr,
1678 &dev_attr_alias.attr,
1679 &dev_attr_vendor.attr,
1681 &dev_attr_use_diag.attr,
1682 &dev_attr_raw_track_access.attr,
1683 &dev_attr_eer_enabled.attr,
1684 &dev_attr_erplog.attr,
1685 &dev_attr_failfast.attr,
1686 &dev_attr_expires.attr,
1687 &dev_attr_retries.attr,
1688 &dev_attr_timeout.attr,
1689 &dev_attr_reservation_policy.attr,
1690 &dev_attr_last_known_reservation_state.attr,
1691 &dev_attr_safe_offline.attr,
1692 &dev_attr_host_access_count.attr,
1693 &dev_attr_path_masks.attr,
1694 &dev_attr_path_threshold.attr,
1695 &dev_attr_path_autodisable.attr,
1696 &dev_attr_path_interval.attr,
1697 &dev_attr_path_reset.attr,
1703 static const struct attribute_group dasd_attr_group = {
1704 .attrs = dasd_attrs,
1707 static struct attribute *capacity_attrs[] = {
1708 &dev_attr_space_configured.attr,
1709 &dev_attr_space_allocated.attr,
1710 &dev_attr_logical_capacity.attr,
1714 static const struct attribute_group capacity_attr_group = {
1716 .attrs = capacity_attrs,
1719 static struct attribute *ext_pool_attrs[] = {
1720 &dev_attr_pool_id.attr,
1721 &dev_attr_extent_size.attr,
1722 &dev_attr_warn_threshold.attr,
1723 &dev_attr_cap_at_warnlevel.attr,
1724 &dev_attr_pool_oos.attr,
1728 static const struct attribute_group ext_pool_attr_group = {
1729 .name = "extent_pool",
1730 .attrs = ext_pool_attrs,
1733 static const struct attribute_group *dasd_attr_groups[] = {
1735 &capacity_attr_group,
1736 &ext_pool_attr_group,
1741 * Return value of the specified feature.
1744 dasd_get_feature(struct ccw_device *cdev, int feature)
1746 struct dasd_devmap *devmap;
1748 devmap = dasd_find_busid(dev_name(&cdev->dev));
1750 return PTR_ERR(devmap);
1752 return ((devmap->features & feature) != 0);
1756 * Set / reset given feature.
1757 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1760 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1762 struct dasd_devmap *devmap;
1764 devmap = dasd_devmap_from_cdev(cdev);
1766 return PTR_ERR(devmap);
1768 spin_lock(&dasd_devmap_lock);
1770 devmap->features |= feature;
1772 devmap->features &= ~feature;
1774 devmap->device->features = devmap->features;
1775 spin_unlock(&dasd_devmap_lock);
1778 EXPORT_SYMBOL(dasd_set_feature);
1781 int dasd_add_sysfs_files(struct ccw_device *cdev)
1783 return sysfs_create_groups(&cdev->dev.kobj, dasd_attr_groups);
1787 dasd_remove_sysfs_files(struct ccw_device *cdev)
1789 sysfs_remove_groups(&cdev->dev.kobj, dasd_attr_groups);
1794 dasd_devmap_init(void)
1798 /* Initialize devmap structures. */
1799 dasd_max_devindex = 0;
1800 for (i = 0; i < 256; i++)
1801 INIT_LIST_HEAD(&dasd_hashlists[i]);
1806 dasd_devmap_exit(void)
1808 dasd_forget_ranges();