2 * File...........: linux/drivers/s390/block/dasd_devmap.c
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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 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 <asm/uaccess.h>
28 #define PRINTK_HEADER "dasd_devmap:"
29 #define DASD_BUS_ID_SIZE 20
33 struct kmem_cache *dasd_page_cache;
34 EXPORT_SYMBOL_GPL(dasd_page_cache);
37 * dasd_devmap_t is used to store the features and the relation
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
40 * dasd_devmap_t is added to two linked lists, one to search by
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.
47 struct list_head list;
48 char bus_id[DASD_BUS_ID_SIZE];
49 unsigned int devindex;
50 unsigned short features;
51 struct dasd_device *device;
55 * Parameter parsing functions for dasd= parameter. The syntax is:
56 * <devno> : (0x)?[0-9a-fA-F]+
57 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
59 * <feature_list> : \(<feature>(:<feature>)*\)
60 * <devno-range> : <devno>(-<devno>)?<feature_list>?
61 * <busid-range> : <busid>(-<busid>)?<feature_list>?
62 * <devices> : <devno-range>|<busid-range>
63 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
65 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
68 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
69 int dasd_autodetect = 0; /* is true, when autodetection is active */
70 int dasd_nopav = 0; /* is true, when PAV is disabled */
71 EXPORT_SYMBOL_GPL(dasd_nopav);
72 int dasd_nofcx; /* disable High Performance Ficon */
73 EXPORT_SYMBOL_GPL(dasd_nofcx);
76 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
77 * it is named 'dasd' to directly be filled by insmod with the comma separated
78 * strings when running as a module.
80 static char *dasd[256];
81 module_param_array(dasd, charp, NULL, 0);
84 * Single spinlock to protect devmap and servermap structures and lists.
86 static DEFINE_SPINLOCK(dasd_devmap_lock);
89 * Hash lists for devmap structures.
91 static struct list_head dasd_hashlists[256];
92 int dasd_max_devindex;
94 static struct dasd_devmap *dasd_add_busid(const char *, int);
97 dasd_hash_busid(const char *bus_id)
102 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
109 * The parameter parsing functions for builtin-drivers are called
110 * before kmalloc works. Store the pointers to the parameters strings
111 * into dasd[] for later processing.
114 dasd_call_setup(char *str)
116 static int count = 0;
123 __setup ("dasd=", dasd_call_setup);
124 #endif /* #ifndef MODULE */
126 #define DASD_IPLDEV "ipldev"
129 * Read a device busid/devno from a string.
133 dasd_busid(char **str, int *id0, int *id1, int *devno)
137 /* Interpret ipldev busid */
138 if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
139 if (ipl_info.type != IPL_TYPE_CCW) {
140 pr_err("The IPL device is not a CCW device\n");
144 *id1 = ipl_info.data.ccw.dev_id.ssid;
145 *devno = ipl_info.data.ccw.dev_id.devno;
146 *str += strlen(DASD_IPLDEV);
150 /* check for leading '0x' */
152 if ((*str)[0] == '0' && (*str)[1] == 'x') {
156 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
158 val = simple_strtoul(*str, str, 16);
159 if (old_style || (*str)[0] != '.') {
161 if (val < 0 || val > 0xffff)
166 /* New style x.y.z busid */
167 if (val < 0 || val > 0xff)
171 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
173 val = simple_strtoul(*str, str, 16);
174 if (val < 0 || val > 0xff || (*str)++[0] != '.')
177 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
179 val = simple_strtoul(*str, str, 16);
180 if (val < 0 || val > 0xffff)
187 * Read colon separated list of dasd features. Currently there is
188 * only one: "ro" for read-only devices. The default feature set
189 * is empty (value 0).
192 dasd_feature_list(char *str, char **endp)
194 int features, len, rc;
199 return DASD_FEATURE_DEFAULT;
206 str[len] && str[len] != ':' && str[len] != ')'; len++);
207 if (len == 2 && !strncmp(str, "ro", 2))
208 features |= DASD_FEATURE_READONLY;
209 else if (len == 4 && !strncmp(str, "diag", 4))
210 features |= DASD_FEATURE_USEDIAG;
211 else if (len == 6 && !strncmp(str, "erplog", 6))
212 features |= DASD_FEATURE_ERPLOG;
213 else if (len == 8 && !strncmp(str, "failfast", 8))
214 features |= DASD_FEATURE_FAILFAST;
216 pr_warning("%*s is not a supported device option\n",
226 pr_warning("A closing parenthesis ')' is missing in the "
227 "dasd= parameter\n");
238 * Try to match the first element on the comma separated parse string
239 * with one of the known keywords. If a keyword is found, take the approprate
240 * action and return a pointer to the residual string. If the first element
241 * could not be matched to any keyword then return an error code.
244 dasd_parse_keyword( char *parsestring ) {
246 char *nextcomma, *residual_str;
249 nextcomma = strchr(parsestring,',');
251 length = nextcomma - parsestring;
252 residual_str = nextcomma + 1;
254 length = strlen(parsestring);
255 residual_str = parsestring + length;
257 if (strncmp("autodetect", parsestring, length) == 0) {
259 pr_info("The autodetection mode has been activated\n");
262 if (strncmp("probeonly", parsestring, length) == 0) {
264 pr_info("The probeonly mode has been activated\n");
267 if (strncmp("nopav", parsestring, length) == 0) {
269 pr_info("'nopav' is not supported on z/VM\n");
272 pr_info("PAV support has be deactivated\n");
276 if (strncmp("nofcx", parsestring, length) == 0) {
278 pr_info("High Performance FICON support has been "
282 if (strncmp("fixedbuffers", parsestring, length) == 0) {
286 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
287 PAGE_SIZE, SLAB_CACHE_DMA,
289 if (!dasd_page_cache)
290 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
291 "fixed buffer mode disabled.");
293 DBF_EVENT(DBF_INFO, "%s",
294 "turning on fixed buffer mode");
297 return ERR_PTR(-EINVAL);
301 * Try to interprete the first element on the comma separated parse string
302 * as a device number or a range of devices. If the interpretation is
303 * successfull, create the matching dasd_devmap entries and return a pointer
304 * to the residual string.
305 * If interpretation fails or in case of an error, return an error code.
308 dasd_parse_range( char *parsestring ) {
310 struct dasd_devmap *devmap;
311 int from, from_id0, from_id1;
312 int to, to_id0, to_id1;
314 char bus_id[DASD_BUS_ID_SIZE+1], *str;
317 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
324 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
328 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
331 pr_err("%s is not a valid device range\n", parsestring);
334 features = dasd_feature_list(str, &str);
336 return ERR_PTR(-EINVAL);
337 /* each device in dasd= parameter should be set initially online */
338 features |= DASD_FEATURE_INITIAL_ONLINE;
340 sprintf(bus_id, "%01x.%01x.%04x",
341 from_id0, from_id1, from++);
342 devmap = dasd_add_busid(bus_id, features);
344 return (char *)devmap;
350 pr_warning("The dasd= parameter value %s has an invalid ending\n",
352 return ERR_PTR(-EINVAL);
356 dasd_parse_next_element( char *parsestring ) {
358 residual_str = dasd_parse_keyword(parsestring);
359 if (!IS_ERR(residual_str))
361 residual_str = dasd_parse_range(parsestring);
366 * Parse parameters stored in dasd[]
367 * The 'dasd=...' parameter allows to specify a comma separated list of
368 * keywords and device ranges. When the dasd driver is build into the kernel,
369 * the complete list will be stored as one element of the dasd[] array.
370 * When the dasd driver is build as a module, then the list is broken into
371 * it's elements and each dasd[] entry contains one element.
380 for (i = 0; i < 256; i++) {
383 parsestring = dasd[i];
384 /* loop over the comma separated list in the parsestring */
385 while (*parsestring) {
386 parsestring = dasd_parse_next_element(parsestring);
387 if(IS_ERR(parsestring)) {
388 rc = PTR_ERR(parsestring);
393 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
401 * Add a devmap for the device specified by busid. It is possible that
402 * the devmap already exists (dasd= parameter). The order of the devices
403 * added through this function will define the kdevs for the individual
406 static struct dasd_devmap *
407 dasd_add_busid(const char *bus_id, int features)
409 struct dasd_devmap *devmap, *new, *tmp;
412 new = (struct dasd_devmap *)
413 kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
415 return ERR_PTR(-ENOMEM);
416 spin_lock(&dasd_devmap_lock);
418 hash = dasd_hash_busid(bus_id);
419 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
420 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
425 /* This bus_id is new. */
426 new->devindex = dasd_max_devindex++;
427 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
428 new->features = features;
430 list_add(&new->list, &dasd_hashlists[hash]);
434 spin_unlock(&dasd_devmap_lock);
440 * Find devmap for device with given bus_id.
442 static struct dasd_devmap *
443 dasd_find_busid(const char *bus_id)
445 struct dasd_devmap *devmap, *tmp;
448 spin_lock(&dasd_devmap_lock);
449 devmap = ERR_PTR(-ENODEV);
450 hash = dasd_hash_busid(bus_id);
451 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
452 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
457 spin_unlock(&dasd_devmap_lock);
462 * Check if busid has been added to the list of dasd ranges.
465 dasd_busid_known(const char *bus_id)
467 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
471 * Forget all about the device numbers added so far.
472 * This may only be called at module unload or system shutdown.
475 dasd_forget_ranges(void)
477 struct dasd_devmap *devmap, *n;
480 spin_lock(&dasd_devmap_lock);
481 for (i = 0; i < 256; i++) {
482 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
483 BUG_ON(devmap->device != NULL);
484 list_del(&devmap->list);
488 spin_unlock(&dasd_devmap_lock);
492 * Find the device struct by its device index.
495 dasd_device_from_devindex(int devindex)
497 struct dasd_devmap *devmap, *tmp;
498 struct dasd_device *device;
501 spin_lock(&dasd_devmap_lock);
503 for (i = 0; (i < 256) && !devmap; i++)
504 list_for_each_entry(tmp, &dasd_hashlists[i], list)
505 if (tmp->devindex == devindex) {
506 /* Found the devmap for the device. */
510 if (devmap && devmap->device) {
511 device = devmap->device;
512 dasd_get_device(device);
514 device = ERR_PTR(-ENODEV);
515 spin_unlock(&dasd_devmap_lock);
520 * Return devmap for cdev. If no devmap exists yet, create one and
521 * connect it to the cdev.
523 static struct dasd_devmap *
524 dasd_devmap_from_cdev(struct ccw_device *cdev)
526 struct dasd_devmap *devmap;
528 devmap = dasd_find_busid(dev_name(&cdev->dev));
530 devmap = dasd_add_busid(dev_name(&cdev->dev),
531 DASD_FEATURE_DEFAULT);
536 * Create a dasd device structure for cdev.
539 dasd_create_device(struct ccw_device *cdev)
541 struct dasd_devmap *devmap;
542 struct dasd_device *device;
546 devmap = dasd_devmap_from_cdev(cdev);
548 return (void *) devmap;
550 device = dasd_alloc_device();
553 atomic_set(&device->ref_count, 3);
555 spin_lock(&dasd_devmap_lock);
556 if (!devmap->device) {
557 devmap->device = device;
558 device->devindex = devmap->devindex;
559 device->features = devmap->features;
560 get_device(&cdev->dev);
564 /* Someone else was faster. */
566 spin_unlock(&dasd_devmap_lock);
569 dasd_free_device(device);
573 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
574 dev_set_drvdata(&cdev->dev, device);
575 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
581 * Wait queue for dasd_delete_device waits.
583 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
586 * Remove a dasd device structure. The passed referenced
590 dasd_delete_device(struct dasd_device *device)
592 struct ccw_device *cdev;
593 struct dasd_devmap *devmap;
596 /* First remove device pointer from devmap. */
597 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
598 BUG_ON(IS_ERR(devmap));
599 spin_lock(&dasd_devmap_lock);
600 if (devmap->device != device) {
601 spin_unlock(&dasd_devmap_lock);
602 dasd_put_device(device);
605 devmap->device = NULL;
606 spin_unlock(&dasd_devmap_lock);
608 /* Disconnect dasd_device structure from ccw_device structure. */
609 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
610 dev_set_drvdata(&device->cdev->dev, NULL);
611 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
614 * Drop ref_count by 3, one for the devmap reference, one for
615 * the cdev reference and one for the passed reference.
617 atomic_sub(3, &device->ref_count);
619 /* Wait for reference counter to drop to zero. */
620 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
622 /* Disconnect dasd_device structure from ccw_device structure. */
626 /* Put ccw_device structure. */
627 put_device(&cdev->dev);
629 /* Now the device structure can be freed. */
630 dasd_free_device(device);
634 * Reference counter dropped to zero. Wake up waiter
635 * in dasd_delete_device.
638 dasd_put_device_wake(struct dasd_device *device)
640 wake_up(&dasd_delete_wq);
644 * Return dasd_device structure associated with cdev.
645 * This function needs to be called with the ccw device
646 * lock held. It can be used from interrupt context.
649 dasd_device_from_cdev_locked(struct ccw_device *cdev)
651 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
654 return ERR_PTR(-ENODEV);
655 dasd_get_device(device);
660 * Return dasd_device structure associated with cdev.
663 dasd_device_from_cdev(struct ccw_device *cdev)
665 struct dasd_device *device;
668 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
669 device = dasd_device_from_cdev_locked(cdev);
670 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
675 * SECTION: files in sysfs
679 * failfast controls the behaviour, if no path is available
681 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
684 struct dasd_devmap *devmap;
687 devmap = dasd_find_busid(dev_name(dev));
689 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
691 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
692 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
695 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
696 const char *buf, size_t count)
698 struct dasd_devmap *devmap;
702 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
704 return PTR_ERR(devmap);
706 val = simple_strtoul(buf, &endp, 0);
707 if (((endp + 1) < (buf + count)) || (val > 1))
710 spin_lock(&dasd_devmap_lock);
712 devmap->features |= DASD_FEATURE_FAILFAST;
714 devmap->features &= ~DASD_FEATURE_FAILFAST;
716 devmap->device->features = devmap->features;
717 spin_unlock(&dasd_devmap_lock);
721 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
724 * readonly controls the readonly status of a dasd
727 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
729 struct dasd_devmap *devmap;
732 devmap = dasd_find_busid(dev_name(dev));
734 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
736 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
737 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
741 dasd_ro_store(struct device *dev, struct device_attribute *attr,
742 const char *buf, size_t count)
744 struct dasd_devmap *devmap;
745 struct dasd_device *device;
749 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
751 return PTR_ERR(devmap);
753 val = simple_strtoul(buf, &endp, 0);
754 if (((endp + 1) < (buf + count)) || (val > 1))
757 spin_lock(&dasd_devmap_lock);
759 devmap->features |= DASD_FEATURE_READONLY;
761 devmap->features &= ~DASD_FEATURE_READONLY;
762 device = devmap->device;
764 device->features = devmap->features;
765 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
767 spin_unlock(&dasd_devmap_lock);
768 if (device && device->block && device->block->gdp)
769 set_disk_ro(device->block->gdp, val);
773 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
775 * erplog controls the logging of ERP related data
776 * (e.g. failing channel programs).
779 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
781 struct dasd_devmap *devmap;
784 devmap = dasd_find_busid(dev_name(dev));
786 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
788 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
789 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
793 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
794 const char *buf, size_t count)
796 struct dasd_devmap *devmap;
800 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
802 return PTR_ERR(devmap);
804 val = simple_strtoul(buf, &endp, 0);
805 if (((endp + 1) < (buf + count)) || (val > 1))
808 spin_lock(&dasd_devmap_lock);
810 devmap->features |= DASD_FEATURE_ERPLOG;
812 devmap->features &= ~DASD_FEATURE_ERPLOG;
814 devmap->device->features = devmap->features;
815 spin_unlock(&dasd_devmap_lock);
819 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
822 * use_diag controls whether the driver should use diag rather than ssch
823 * to talk to the device
826 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
828 struct dasd_devmap *devmap;
831 devmap = dasd_find_busid(dev_name(dev));
833 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
835 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
836 return sprintf(buf, use_diag ? "1\n" : "0\n");
840 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
841 const char *buf, size_t count)
843 struct dasd_devmap *devmap;
848 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
850 return PTR_ERR(devmap);
852 val = simple_strtoul(buf, &endp, 0);
853 if (((endp + 1) < (buf + count)) || (val > 1))
856 spin_lock(&dasd_devmap_lock);
857 /* Changing diag discipline flag is only allowed in offline state. */
859 if (!devmap->device) {
861 devmap->features |= DASD_FEATURE_USEDIAG;
863 devmap->features &= ~DASD_FEATURE_USEDIAG;
866 spin_unlock(&dasd_devmap_lock);
870 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
873 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
876 struct dasd_device *device;
879 device = dasd_device_from_cdev(to_ccwdev(dev));
882 else if (!device->discipline) {
883 dasd_put_device(device);
886 len = snprintf(buf, PAGE_SIZE, "%s\n",
887 device->discipline->name);
888 dasd_put_device(device);
892 len = snprintf(buf, PAGE_SIZE, "none\n");
896 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
899 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
902 struct dasd_device *device;
905 device = dasd_device_from_cdev(to_ccwdev(dev));
906 if (!IS_ERR(device)) {
907 switch (device->state) {
909 len = snprintf(buf, PAGE_SIZE, "new\n");
911 case DASD_STATE_KNOWN:
912 len = snprintf(buf, PAGE_SIZE, "detected\n");
914 case DASD_STATE_BASIC:
915 len = snprintf(buf, PAGE_SIZE, "basic\n");
917 case DASD_STATE_UNFMT:
918 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
920 case DASD_STATE_READY:
921 len = snprintf(buf, PAGE_SIZE, "ready\n");
923 case DASD_STATE_ONLINE:
924 len = snprintf(buf, PAGE_SIZE, "online\n");
927 len = snprintf(buf, PAGE_SIZE, "no stat\n");
930 dasd_put_device(device);
932 len = snprintf(buf, PAGE_SIZE, "unknown\n");
936 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
938 static ssize_t dasd_alias_show(struct device *dev,
939 struct device_attribute *attr, char *buf)
941 struct dasd_device *device;
944 device = dasd_device_from_cdev(to_ccwdev(dev));
946 return sprintf(buf, "0\n");
948 if (device->discipline && device->discipline->get_uid &&
949 !device->discipline->get_uid(device, &uid)) {
950 if (uid.type == UA_BASE_PAV_ALIAS ||
951 uid.type == UA_HYPER_PAV_ALIAS) {
952 dasd_put_device(device);
953 return sprintf(buf, "1\n");
956 dasd_put_device(device);
958 return sprintf(buf, "0\n");
961 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
963 static ssize_t dasd_vendor_show(struct device *dev,
964 struct device_attribute *attr, char *buf)
966 struct dasd_device *device;
970 device = dasd_device_from_cdev(to_ccwdev(dev));
973 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
975 if (device->discipline && device->discipline->get_uid &&
976 !device->discipline->get_uid(device, &uid))
979 dasd_put_device(device);
981 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
984 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
986 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
987 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
991 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
993 struct dasd_device *device;
995 char uid_string[UID_STRLEN];
998 device = dasd_device_from_cdev(to_ccwdev(dev));
1001 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1003 if (device->discipline && device->discipline->get_uid &&
1004 !device->discipline->get_uid(device, &uid)) {
1006 case UA_BASE_DEVICE:
1007 snprintf(ua_string, sizeof(ua_string), "%02x",
1008 uid.real_unit_addr);
1010 case UA_BASE_PAV_ALIAS:
1011 snprintf(ua_string, sizeof(ua_string), "%02x",
1012 uid.base_unit_addr);
1014 case UA_HYPER_PAV_ALIAS:
1015 snprintf(ua_string, sizeof(ua_string), "xx");
1018 /* should not happen, treat like base device */
1019 snprintf(ua_string, sizeof(ua_string), "%02x",
1020 uid.real_unit_addr);
1024 if (strlen(uid.vduit) > 0)
1025 snprintf(uid_string, sizeof(uid_string),
1027 uid.vendor, uid.serial, uid.ssid, ua_string,
1030 snprintf(uid_string, sizeof(uid_string),
1032 uid.vendor, uid.serial, uid.ssid, ua_string);
1034 dasd_put_device(device);
1036 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1038 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1041 * extended error-reporting
1044 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1046 struct dasd_devmap *devmap;
1049 devmap = dasd_find_busid(dev_name(dev));
1050 if (!IS_ERR(devmap) && devmap->device)
1051 eer_flag = dasd_eer_enabled(devmap->device);
1054 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1058 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1059 const char *buf, size_t count)
1061 struct dasd_devmap *devmap;
1065 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1067 return PTR_ERR(devmap);
1068 if (!devmap->device)
1071 val = simple_strtoul(buf, &endp, 0);
1072 if (((endp + 1) < (buf + count)) || (val > 1))
1076 rc = dasd_eer_enable(devmap->device);
1080 dasd_eer_disable(devmap->device);
1084 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1087 * expiration time for default requests
1090 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1092 struct dasd_device *device;
1095 device = dasd_device_from_cdev(to_ccwdev(dev));
1098 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1099 dasd_put_device(device);
1104 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1105 const char *buf, size_t count)
1107 struct dasd_device *device;
1110 device = dasd_device_from_cdev(to_ccwdev(dev));
1114 if ((strict_strtoul(buf, 10, &val) != 0) ||
1115 (val > DASD_EXPIRES_MAX) || val == 0) {
1116 dasd_put_device(device);
1121 device->default_expires = val;
1123 dasd_put_device(device);
1127 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1129 static struct attribute * dasd_attrs[] = {
1130 &dev_attr_readonly.attr,
1131 &dev_attr_discipline.attr,
1132 &dev_attr_status.attr,
1133 &dev_attr_alias.attr,
1134 &dev_attr_vendor.attr,
1136 &dev_attr_use_diag.attr,
1137 &dev_attr_eer_enabled.attr,
1138 &dev_attr_erplog.attr,
1139 &dev_attr_failfast.attr,
1140 &dev_attr_expires.attr,
1144 static struct attribute_group dasd_attr_group = {
1145 .attrs = dasd_attrs,
1149 * Return value of the specified feature.
1152 dasd_get_feature(struct ccw_device *cdev, int feature)
1154 struct dasd_devmap *devmap;
1156 devmap = dasd_find_busid(dev_name(&cdev->dev));
1158 return PTR_ERR(devmap);
1160 return ((devmap->features & feature) != 0);
1164 * Set / reset given feature.
1165 * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1168 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1170 struct dasd_devmap *devmap;
1172 devmap = dasd_find_busid(dev_name(&cdev->dev));
1174 return PTR_ERR(devmap);
1176 spin_lock(&dasd_devmap_lock);
1178 devmap->features |= feature;
1180 devmap->features &= ~feature;
1182 devmap->device->features = devmap->features;
1183 spin_unlock(&dasd_devmap_lock);
1189 dasd_add_sysfs_files(struct ccw_device *cdev)
1191 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1195 dasd_remove_sysfs_files(struct ccw_device *cdev)
1197 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1202 dasd_devmap_init(void)
1206 /* Initialize devmap structures. */
1207 dasd_max_devindex = 0;
1208 for (i = 0; i < 256; i++)
1209 INIT_LIST_HEAD(&dasd_hashlists[i]);
1214 dasd_devmap_exit(void)
1216 dasd_forget_ranges();