2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999,2001
9 * Device mapping and dasd= parameter parsing functions. All devmap
10 * functions may not be called from interrupt context. In particular
11 * dasd_get_device is a no-no from interrupt context.
15 #define KMSG_COMPONENT "dasd"
17 #include <linux/ctype.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
22 #include <asm/debug.h>
23 #include <asm/uaccess.h>
27 #define PRINTK_HEADER "dasd_devmap:"
28 #define DASD_BUS_ID_SIZE 20
32 struct kmem_cache *dasd_page_cache;
33 EXPORT_SYMBOL_GPL(dasd_page_cache);
36 * dasd_devmap_t is used to store the features and the relation
37 * between device number and device index. To find a dasd_devmap_t
38 * that corresponds to a device number of a device index each
39 * dasd_devmap_t is added to two linked lists, one to search by
40 * the device number and one to search by the device index. As
41 * soon as big minor numbers are available the device index list
42 * can be removed since the device number will then be identical
43 * to the device index.
46 struct list_head list;
47 char bus_id[DASD_BUS_ID_SIZE];
48 unsigned int devindex;
49 unsigned short features;
50 struct dasd_device *device;
54 * Parameter parsing functions for dasd= parameter. The syntax is:
55 * <devno> : (0x)?[0-9a-fA-F]+
56 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
58 * <feature_list> : \(<feature>(:<feature>)*\)
59 * <devno-range> : <devno>(-<devno>)?<feature_list>?
60 * <busid-range> : <busid>(-<busid>)?<feature_list>?
61 * <devices> : <devno-range>|<busid-range>
62 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
64 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
67 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
68 int dasd_autodetect = 0; /* is true, when autodetection is active */
69 int dasd_nopav = 0; /* is true, when PAV is disabled */
70 EXPORT_SYMBOL_GPL(dasd_nopav);
71 int dasd_nofcx; /* disable High Performance Ficon */
72 EXPORT_SYMBOL_GPL(dasd_nofcx);
75 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
76 * it is named 'dasd' to directly be filled by insmod with the comma separated
77 * strings when running as a module.
79 static char *dasd[256];
80 module_param_array(dasd, charp, NULL, 0);
83 * Single spinlock to protect devmap and servermap structures and lists.
85 static DEFINE_SPINLOCK(dasd_devmap_lock);
88 * Hash lists for devmap structures.
90 static struct list_head dasd_hashlists[256];
91 int dasd_max_devindex;
93 static struct dasd_devmap *dasd_add_busid(const char *, int);
96 dasd_hash_busid(const char *bus_id)
101 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
108 * The parameter parsing functions for builtin-drivers are called
109 * before kmalloc works. Store the pointers to the parameters strings
110 * into dasd[] for later processing.
113 dasd_call_setup(char *str)
115 static int count = 0;
122 __setup ("dasd=", dasd_call_setup);
123 #endif /* #ifndef MODULE */
125 #define DASD_IPLDEV "ipldev"
128 * Read a device busid/devno from a string.
132 dasd_busid(char **str, int *id0, int *id1, int *devno)
136 /* Interpret ipldev busid */
137 if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
138 if (ipl_info.type != IPL_TYPE_CCW) {
139 pr_err("The IPL device is not a CCW device\n");
143 *id1 = ipl_info.data.ccw.dev_id.ssid;
144 *devno = ipl_info.data.ccw.dev_id.devno;
145 *str += strlen(DASD_IPLDEV);
149 /* check for leading '0x' */
151 if ((*str)[0] == '0' && (*str)[1] == 'x') {
155 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
157 val = simple_strtoul(*str, str, 16);
158 if (old_style || (*str)[0] != '.') {
160 if (val < 0 || val > 0xffff)
165 /* New style x.y.z busid */
166 if (val < 0 || val > 0xff)
170 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
172 val = simple_strtoul(*str, str, 16);
173 if (val < 0 || val > 0xff || (*str)++[0] != '.')
176 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
178 val = simple_strtoul(*str, str, 16);
179 if (val < 0 || val > 0xffff)
186 * Read colon separated list of dasd features. Currently there is
187 * only one: "ro" for read-only devices. The default feature set
188 * is empty (value 0).
191 dasd_feature_list(char *str, char **endp)
193 int features, len, rc;
198 return DASD_FEATURE_DEFAULT;
205 str[len] && str[len] != ':' && str[len] != ')'; len++);
206 if (len == 2 && !strncmp(str, "ro", 2))
207 features |= DASD_FEATURE_READONLY;
208 else if (len == 4 && !strncmp(str, "diag", 4))
209 features |= DASD_FEATURE_USEDIAG;
210 else if (len == 3 && !strncmp(str, "raw", 3))
211 features |= DASD_FEATURE_USERAW;
212 else if (len == 6 && !strncmp(str, "erplog", 6))
213 features |= DASD_FEATURE_ERPLOG;
214 else if (len == 8 && !strncmp(str, "failfast", 8))
215 features |= DASD_FEATURE_FAILFAST;
217 pr_warning("%*s is not a supported device option\n",
227 pr_warning("A closing parenthesis ')' is missing in the "
228 "dasd= parameter\n");
239 * Try to match the first element on the comma separated parse string
240 * with one of the known keywords. If a keyword is found, take the approprate
241 * action and return a pointer to the residual string. If the first element
242 * could not be matched to any keyword then return an error code.
245 dasd_parse_keyword( char *parsestring ) {
247 char *nextcomma, *residual_str;
250 nextcomma = strchr(parsestring,',');
252 length = nextcomma - parsestring;
253 residual_str = nextcomma + 1;
255 length = strlen(parsestring);
256 residual_str = parsestring + length;
258 if (strncmp("autodetect", parsestring, length) == 0) {
260 pr_info("The autodetection mode has been activated\n");
263 if (strncmp("probeonly", parsestring, length) == 0) {
265 pr_info("The probeonly mode has been activated\n");
268 if (strncmp("nopav", parsestring, length) == 0) {
270 pr_info("'nopav' is not supported on z/VM\n");
273 pr_info("PAV support has be deactivated\n");
277 if (strncmp("nofcx", parsestring, length) == 0) {
279 pr_info("High Performance FICON support has been "
283 if (strncmp("fixedbuffers", parsestring, length) == 0) {
287 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
288 PAGE_SIZE, SLAB_CACHE_DMA,
290 if (!dasd_page_cache)
291 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
292 "fixed buffer mode disabled.");
294 DBF_EVENT(DBF_INFO, "%s",
295 "turning on fixed buffer mode");
298 return ERR_PTR(-EINVAL);
302 * Try to interprete the first element on the comma separated parse string
303 * as a device number or a range of devices. If the interpretation is
304 * successful, create the matching dasd_devmap entries and return a pointer
305 * to the residual string.
306 * If interpretation fails or in case of an error, return an error code.
309 dasd_parse_range( char *parsestring ) {
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], *str;
318 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
325 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
329 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
332 pr_err("%s is not a valid device range\n", parsestring);
335 features = dasd_feature_list(str, &str);
337 return ERR_PTR(-EINVAL);
338 /* each device in dasd= parameter should be set initially online */
339 features |= DASD_FEATURE_INITIAL_ONLINE;
341 sprintf(bus_id, "%01x.%01x.%04x",
342 from_id0, from_id1, from++);
343 devmap = dasd_add_busid(bus_id, features);
345 return (char *)devmap;
351 pr_warning("The dasd= parameter value %s has an invalid ending\n",
353 return ERR_PTR(-EINVAL);
357 dasd_parse_next_element( char *parsestring ) {
359 residual_str = dasd_parse_keyword(parsestring);
360 if (!IS_ERR(residual_str))
362 residual_str = dasd_parse_range(parsestring);
367 * Parse parameters stored in dasd[]
368 * The 'dasd=...' parameter allows to specify a comma separated list of
369 * keywords and device ranges. When the dasd driver is build into the kernel,
370 * the complete list will be stored as one element of the dasd[] array.
371 * When the dasd driver is build as a module, then the list is broken into
372 * it's elements and each dasd[] entry contains one element.
381 for (i = 0; i < 256; i++) {
384 parsestring = dasd[i];
385 /* loop over the comma separated list in the parsestring */
386 while (*parsestring) {
387 parsestring = dasd_parse_next_element(parsestring);
388 if(IS_ERR(parsestring)) {
389 rc = PTR_ERR(parsestring);
394 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
402 * Add a devmap for the device specified by busid. It is possible that
403 * the devmap already exists (dasd= parameter). The order of the devices
404 * added through this function will define the kdevs for the individual
407 static struct dasd_devmap *
408 dasd_add_busid(const char *bus_id, int features)
410 struct dasd_devmap *devmap, *new, *tmp;
413 new = (struct dasd_devmap *)
414 kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
416 return ERR_PTR(-ENOMEM);
417 spin_lock(&dasd_devmap_lock);
419 hash = dasd_hash_busid(bus_id);
420 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
421 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
426 /* This bus_id is new. */
427 new->devindex = dasd_max_devindex++;
428 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
429 new->features = features;
431 list_add(&new->list, &dasd_hashlists[hash]);
435 spin_unlock(&dasd_devmap_lock);
441 * Find devmap for device with given bus_id.
443 static struct dasd_devmap *
444 dasd_find_busid(const char *bus_id)
446 struct dasd_devmap *devmap, *tmp;
449 spin_lock(&dasd_devmap_lock);
450 devmap = ERR_PTR(-ENODEV);
451 hash = dasd_hash_busid(bus_id);
452 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
453 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
458 spin_unlock(&dasd_devmap_lock);
463 * Check if busid has been added to the list of dasd ranges.
466 dasd_busid_known(const char *bus_id)
468 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
472 * Forget all about the device numbers added so far.
473 * This may only be called at module unload or system shutdown.
476 dasd_forget_ranges(void)
478 struct dasd_devmap *devmap, *n;
481 spin_lock(&dasd_devmap_lock);
482 for (i = 0; i < 256; i++) {
483 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
484 BUG_ON(devmap->device != NULL);
485 list_del(&devmap->list);
489 spin_unlock(&dasd_devmap_lock);
493 * Find the device struct by its device index.
496 dasd_device_from_devindex(int devindex)
498 struct dasd_devmap *devmap, *tmp;
499 struct dasd_device *device;
502 spin_lock(&dasd_devmap_lock);
504 for (i = 0; (i < 256) && !devmap; i++)
505 list_for_each_entry(tmp, &dasd_hashlists[i], list)
506 if (tmp->devindex == devindex) {
507 /* Found the devmap for the device. */
511 if (devmap && devmap->device) {
512 device = devmap->device;
513 dasd_get_device(device);
515 device = ERR_PTR(-ENODEV);
516 spin_unlock(&dasd_devmap_lock);
521 * Return devmap for cdev. If no devmap exists yet, create one and
522 * connect it to the cdev.
524 static struct dasd_devmap *
525 dasd_devmap_from_cdev(struct ccw_device *cdev)
527 struct dasd_devmap *devmap;
529 devmap = dasd_find_busid(dev_name(&cdev->dev));
531 devmap = dasd_add_busid(dev_name(&cdev->dev),
532 DASD_FEATURE_DEFAULT);
537 * Create a dasd device structure for cdev.
540 dasd_create_device(struct ccw_device *cdev)
542 struct dasd_devmap *devmap;
543 struct dasd_device *device;
547 devmap = dasd_devmap_from_cdev(cdev);
549 return (void *) devmap;
551 device = dasd_alloc_device();
554 atomic_set(&device->ref_count, 3);
556 spin_lock(&dasd_devmap_lock);
557 if (!devmap->device) {
558 devmap->device = device;
559 device->devindex = devmap->devindex;
560 device->features = devmap->features;
561 get_device(&cdev->dev);
565 /* Someone else was faster. */
567 spin_unlock(&dasd_devmap_lock);
570 dasd_free_device(device);
574 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
575 dev_set_drvdata(&cdev->dev, device);
576 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
582 * Wait queue for dasd_delete_device waits.
584 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
587 * Remove a dasd device structure. The passed referenced
591 dasd_delete_device(struct dasd_device *device)
593 struct ccw_device *cdev;
594 struct dasd_devmap *devmap;
597 /* First remove device pointer from devmap. */
598 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
599 BUG_ON(IS_ERR(devmap));
600 spin_lock(&dasd_devmap_lock);
601 if (devmap->device != device) {
602 spin_unlock(&dasd_devmap_lock);
603 dasd_put_device(device);
606 devmap->device = NULL;
607 spin_unlock(&dasd_devmap_lock);
609 /* Disconnect dasd_device structure from ccw_device structure. */
610 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
611 dev_set_drvdata(&device->cdev->dev, NULL);
612 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
615 * Drop ref_count by 3, one for the devmap reference, one for
616 * the cdev reference and one for the passed reference.
618 atomic_sub(3, &device->ref_count);
620 /* Wait for reference counter to drop to zero. */
621 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
623 /* Disconnect dasd_device structure from ccw_device structure. */
627 /* Put ccw_device structure. */
628 put_device(&cdev->dev);
630 /* Now the device structure can be freed. */
631 dasd_free_device(device);
635 * Reference counter dropped to zero. Wake up waiter
636 * in dasd_delete_device.
639 dasd_put_device_wake(struct dasd_device *device)
641 wake_up(&dasd_delete_wq);
643 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
646 * Return dasd_device structure associated with cdev.
647 * This function needs to be called with the ccw device
648 * lock held. It can be used from interrupt context.
651 dasd_device_from_cdev_locked(struct ccw_device *cdev)
653 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
656 return ERR_PTR(-ENODEV);
657 dasd_get_device(device);
662 * Return dasd_device structure associated with cdev.
665 dasd_device_from_cdev(struct ccw_device *cdev)
667 struct dasd_device *device;
670 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
671 device = dasd_device_from_cdev_locked(cdev);
672 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
676 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
678 struct dasd_devmap *devmap;
680 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
683 spin_lock(&dasd_devmap_lock);
684 gdp->private_data = devmap;
685 spin_unlock(&dasd_devmap_lock);
688 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
690 struct dasd_device *device;
691 struct dasd_devmap *devmap;
693 if (!gdp->private_data)
696 spin_lock(&dasd_devmap_lock);
697 devmap = gdp->private_data;
698 if (devmap && devmap->device) {
699 device = devmap->device;
700 dasd_get_device(device);
702 spin_unlock(&dasd_devmap_lock);
707 * SECTION: files in sysfs
711 * failfast controls the behaviour, if no path is available
713 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
716 struct dasd_devmap *devmap;
719 devmap = dasd_find_busid(dev_name(dev));
721 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
723 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
724 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
727 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
728 const char *buf, size_t count)
730 struct dasd_devmap *devmap;
734 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
736 return PTR_ERR(devmap);
738 val = simple_strtoul(buf, &endp, 0);
739 if (((endp + 1) < (buf + count)) || (val > 1))
742 spin_lock(&dasd_devmap_lock);
744 devmap->features |= DASD_FEATURE_FAILFAST;
746 devmap->features &= ~DASD_FEATURE_FAILFAST;
748 devmap->device->features = devmap->features;
749 spin_unlock(&dasd_devmap_lock);
753 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
756 * readonly controls the readonly status of a dasd
759 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
761 struct dasd_devmap *devmap;
764 devmap = dasd_find_busid(dev_name(dev));
766 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
768 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
769 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
773 dasd_ro_store(struct device *dev, struct device_attribute *attr,
774 const char *buf, size_t count)
776 struct dasd_devmap *devmap;
777 struct dasd_device *device;
781 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
783 return PTR_ERR(devmap);
785 val = simple_strtoul(buf, &endp, 0);
786 if (((endp + 1) < (buf + count)) || (val > 1))
789 spin_lock(&dasd_devmap_lock);
791 devmap->features |= DASD_FEATURE_READONLY;
793 devmap->features &= ~DASD_FEATURE_READONLY;
794 device = devmap->device;
796 device->features = devmap->features;
797 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
799 spin_unlock(&dasd_devmap_lock);
800 if (device && device->block && device->block->gdp)
801 set_disk_ro(device->block->gdp, val);
805 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
807 * erplog controls the logging of ERP related data
808 * (e.g. failing channel programs).
811 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
813 struct dasd_devmap *devmap;
816 devmap = dasd_find_busid(dev_name(dev));
818 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
820 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
821 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
825 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
826 const char *buf, size_t count)
828 struct dasd_devmap *devmap;
832 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
834 return PTR_ERR(devmap);
836 val = simple_strtoul(buf, &endp, 0);
837 if (((endp + 1) < (buf + count)) || (val > 1))
840 spin_lock(&dasd_devmap_lock);
842 devmap->features |= DASD_FEATURE_ERPLOG;
844 devmap->features &= ~DASD_FEATURE_ERPLOG;
846 devmap->device->features = devmap->features;
847 spin_unlock(&dasd_devmap_lock);
851 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
854 * use_diag controls whether the driver should use diag rather than ssch
855 * to talk to the device
858 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
860 struct dasd_devmap *devmap;
863 devmap = dasd_find_busid(dev_name(dev));
865 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
867 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
868 return sprintf(buf, use_diag ? "1\n" : "0\n");
872 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
873 const char *buf, size_t count)
875 struct dasd_devmap *devmap;
880 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
882 return PTR_ERR(devmap);
884 val = simple_strtoul(buf, &endp, 0);
885 if (((endp + 1) < (buf + count)) || (val > 1))
888 spin_lock(&dasd_devmap_lock);
889 /* Changing diag discipline flag is only allowed in offline state. */
891 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
893 devmap->features |= DASD_FEATURE_USEDIAG;
895 devmap->features &= ~DASD_FEATURE_USEDIAG;
898 spin_unlock(&dasd_devmap_lock);
902 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
905 * use_raw controls whether the driver should give access to raw eckd data or
906 * operate in standard mode
909 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
911 struct dasd_devmap *devmap;
914 devmap = dasd_find_busid(dev_name(dev));
916 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
918 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
919 return sprintf(buf, use_raw ? "1\n" : "0\n");
923 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
924 const char *buf, size_t count)
926 struct dasd_devmap *devmap;
930 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
932 return PTR_ERR(devmap);
934 if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
937 spin_lock(&dasd_devmap_lock);
938 /* Changing diag discipline flag is only allowed in offline state. */
940 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
942 devmap->features |= DASD_FEATURE_USERAW;
944 devmap->features &= ~DASD_FEATURE_USERAW;
947 spin_unlock(&dasd_devmap_lock);
951 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
955 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
956 const char *buf, size_t count)
958 struct ccw_device *cdev = to_ccwdev(dev);
959 struct dasd_device *device;
962 device = dasd_device_from_cdev(cdev);
963 if (IS_ERR(device)) {
964 rc = PTR_ERR(device);
968 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
969 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
970 /* Already doing offline processing */
971 dasd_put_device(device);
976 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
977 dasd_put_device(device);
979 rc = ccw_device_set_offline(cdev);
982 return rc ? rc : count;
985 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
988 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
991 struct dasd_device *device;
994 device = dasd_device_from_cdev(to_ccwdev(dev));
997 else if (!device->discipline) {
998 dasd_put_device(device);
1001 len = snprintf(buf, PAGE_SIZE, "%s\n",
1002 device->discipline->name);
1003 dasd_put_device(device);
1007 len = snprintf(buf, PAGE_SIZE, "none\n");
1011 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1014 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1017 struct dasd_device *device;
1020 device = dasd_device_from_cdev(to_ccwdev(dev));
1021 if (!IS_ERR(device)) {
1022 switch (device->state) {
1023 case DASD_STATE_NEW:
1024 len = snprintf(buf, PAGE_SIZE, "new\n");
1026 case DASD_STATE_KNOWN:
1027 len = snprintf(buf, PAGE_SIZE, "detected\n");
1029 case DASD_STATE_BASIC:
1030 len = snprintf(buf, PAGE_SIZE, "basic\n");
1032 case DASD_STATE_UNFMT:
1033 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1035 case DASD_STATE_READY:
1036 len = snprintf(buf, PAGE_SIZE, "ready\n");
1038 case DASD_STATE_ONLINE:
1039 len = snprintf(buf, PAGE_SIZE, "online\n");
1042 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1045 dasd_put_device(device);
1047 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1051 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1053 static ssize_t dasd_alias_show(struct device *dev,
1054 struct device_attribute *attr, char *buf)
1056 struct dasd_device *device;
1057 struct dasd_uid uid;
1059 device = dasd_device_from_cdev(to_ccwdev(dev));
1061 return sprintf(buf, "0\n");
1063 if (device->discipline && device->discipline->get_uid &&
1064 !device->discipline->get_uid(device, &uid)) {
1065 if (uid.type == UA_BASE_PAV_ALIAS ||
1066 uid.type == UA_HYPER_PAV_ALIAS) {
1067 dasd_put_device(device);
1068 return sprintf(buf, "1\n");
1071 dasd_put_device(device);
1073 return sprintf(buf, "0\n");
1076 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1078 static ssize_t dasd_vendor_show(struct device *dev,
1079 struct device_attribute *attr, char *buf)
1081 struct dasd_device *device;
1082 struct dasd_uid uid;
1085 device = dasd_device_from_cdev(to_ccwdev(dev));
1088 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1090 if (device->discipline && device->discipline->get_uid &&
1091 !device->discipline->get_uid(device, &uid))
1092 vendor = uid.vendor;
1094 dasd_put_device(device);
1096 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1099 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1101 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1102 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1106 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1108 struct dasd_device *device;
1109 struct dasd_uid uid;
1110 char uid_string[UID_STRLEN];
1113 device = dasd_device_from_cdev(to_ccwdev(dev));
1116 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1118 if (device->discipline && device->discipline->get_uid &&
1119 !device->discipline->get_uid(device, &uid)) {
1121 case UA_BASE_DEVICE:
1122 snprintf(ua_string, sizeof(ua_string), "%02x",
1123 uid.real_unit_addr);
1125 case UA_BASE_PAV_ALIAS:
1126 snprintf(ua_string, sizeof(ua_string), "%02x",
1127 uid.base_unit_addr);
1129 case UA_HYPER_PAV_ALIAS:
1130 snprintf(ua_string, sizeof(ua_string), "xx");
1133 /* should not happen, treat like base device */
1134 snprintf(ua_string, sizeof(ua_string), "%02x",
1135 uid.real_unit_addr);
1139 if (strlen(uid.vduit) > 0)
1140 snprintf(uid_string, sizeof(uid_string),
1142 uid.vendor, uid.serial, uid.ssid, ua_string,
1145 snprintf(uid_string, sizeof(uid_string),
1147 uid.vendor, uid.serial, uid.ssid, ua_string);
1149 dasd_put_device(device);
1151 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1153 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1156 * extended error-reporting
1159 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1161 struct dasd_devmap *devmap;
1164 devmap = dasd_find_busid(dev_name(dev));
1165 if (!IS_ERR(devmap) && devmap->device)
1166 eer_flag = dasd_eer_enabled(devmap->device);
1169 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1173 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1174 const char *buf, size_t count)
1176 struct dasd_devmap *devmap;
1180 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1182 return PTR_ERR(devmap);
1183 if (!devmap->device)
1186 val = simple_strtoul(buf, &endp, 0);
1187 if (((endp + 1) < (buf + count)) || (val > 1))
1191 rc = dasd_eer_enable(devmap->device);
1195 dasd_eer_disable(devmap->device);
1199 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1202 * expiration time for default requests
1205 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1207 struct dasd_device *device;
1210 device = dasd_device_from_cdev(to_ccwdev(dev));
1213 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1214 dasd_put_device(device);
1219 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1220 const char *buf, size_t count)
1222 struct dasd_device *device;
1225 device = dasd_device_from_cdev(to_ccwdev(dev));
1229 if ((strict_strtoul(buf, 10, &val) != 0) ||
1230 (val > DASD_EXPIRES_MAX) || val == 0) {
1231 dasd_put_device(device);
1236 device->default_expires = val;
1238 dasd_put_device(device);
1242 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1244 static ssize_t dasd_reservation_policy_show(struct device *dev,
1245 struct device_attribute *attr,
1248 struct dasd_devmap *devmap;
1251 devmap = dasd_find_busid(dev_name(dev));
1252 if (IS_ERR(devmap)) {
1253 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1255 spin_lock(&dasd_devmap_lock);
1256 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1257 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1259 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1260 spin_unlock(&dasd_devmap_lock);
1265 static ssize_t dasd_reservation_policy_store(struct device *dev,
1266 struct device_attribute *attr,
1267 const char *buf, size_t count)
1269 struct dasd_devmap *devmap;
1272 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1274 return PTR_ERR(devmap);
1276 spin_lock(&dasd_devmap_lock);
1277 if (sysfs_streq("ignore", buf))
1278 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1279 else if (sysfs_streq("fail", buf))
1280 devmap->features |= DASD_FEATURE_FAILONSLCK;
1284 devmap->device->features = devmap->features;
1285 spin_unlock(&dasd_devmap_lock);
1292 static DEVICE_ATTR(reservation_policy, 0644,
1293 dasd_reservation_policy_show, dasd_reservation_policy_store);
1295 static ssize_t dasd_reservation_state_show(struct device *dev,
1296 struct device_attribute *attr,
1299 struct dasd_device *device;
1302 device = dasd_device_from_cdev(to_ccwdev(dev));
1304 return snprintf(buf, PAGE_SIZE, "none\n");
1306 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1307 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1308 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1309 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1311 rc = snprintf(buf, PAGE_SIZE, "none\n");
1312 dasd_put_device(device);
1316 static ssize_t dasd_reservation_state_store(struct device *dev,
1317 struct device_attribute *attr,
1318 const char *buf, size_t count)
1320 struct dasd_device *device;
1323 device = dasd_device_from_cdev(to_ccwdev(dev));
1326 if (sysfs_streq("reset", buf))
1327 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1330 dasd_put_device(device);
1338 static DEVICE_ATTR(last_known_reservation_state, 0644,
1339 dasd_reservation_state_show, dasd_reservation_state_store);
1341 static struct attribute * dasd_attrs[] = {
1342 &dev_attr_readonly.attr,
1343 &dev_attr_discipline.attr,
1344 &dev_attr_status.attr,
1345 &dev_attr_alias.attr,
1346 &dev_attr_vendor.attr,
1348 &dev_attr_use_diag.attr,
1349 &dev_attr_raw_track_access.attr,
1350 &dev_attr_eer_enabled.attr,
1351 &dev_attr_erplog.attr,
1352 &dev_attr_failfast.attr,
1353 &dev_attr_expires.attr,
1354 &dev_attr_reservation_policy.attr,
1355 &dev_attr_last_known_reservation_state.attr,
1356 &dev_attr_safe_offline.attr,
1360 static struct attribute_group dasd_attr_group = {
1361 .attrs = dasd_attrs,
1365 * Return value of the specified feature.
1368 dasd_get_feature(struct ccw_device *cdev, int feature)
1370 struct dasd_devmap *devmap;
1372 devmap = dasd_find_busid(dev_name(&cdev->dev));
1374 return PTR_ERR(devmap);
1376 return ((devmap->features & feature) != 0);
1380 * Set / reset given feature.
1381 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1384 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1386 struct dasd_devmap *devmap;
1388 devmap = dasd_find_busid(dev_name(&cdev->dev));
1390 return PTR_ERR(devmap);
1392 spin_lock(&dasd_devmap_lock);
1394 devmap->features |= feature;
1396 devmap->features &= ~feature;
1398 devmap->device->features = devmap->features;
1399 spin_unlock(&dasd_devmap_lock);
1405 dasd_add_sysfs_files(struct ccw_device *cdev)
1407 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1411 dasd_remove_sysfs_files(struct ccw_device *cdev)
1413 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1418 dasd_devmap_init(void)
1422 /* Initialize devmap structures. */
1423 dasd_max_devindex = 0;
1424 for (i = 0; i < 256; i++)
1425 INIT_LIST_HEAD(&dasd_hashlists[i]);
1430 dasd_devmap_exit(void)
1432 dasd_forget_ranges();