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 == 3 && !strncmp(str, "raw", 3))
212 features |= DASD_FEATURE_USERAW;
213 else if (len == 6 && !strncmp(str, "erplog", 6))
214 features |= DASD_FEATURE_ERPLOG;
215 else if (len == 8 && !strncmp(str, "failfast", 8))
216 features |= DASD_FEATURE_FAILFAST;
218 pr_warning("%*s is not a supported device option\n",
228 pr_warning("A closing parenthesis ')' is missing in the "
229 "dasd= parameter\n");
240 * Try to match the first element on the comma separated parse string
241 * with one of the known keywords. If a keyword is found, take the approprate
242 * action and return a pointer to the residual string. If the first element
243 * could not be matched to any keyword then return an error code.
246 dasd_parse_keyword( char *parsestring ) {
248 char *nextcomma, *residual_str;
251 nextcomma = strchr(parsestring,',');
253 length = nextcomma - parsestring;
254 residual_str = nextcomma + 1;
256 length = strlen(parsestring);
257 residual_str = parsestring + length;
259 if (strncmp("autodetect", parsestring, length) == 0) {
261 pr_info("The autodetection mode has been activated\n");
264 if (strncmp("probeonly", parsestring, length) == 0) {
266 pr_info("The probeonly mode has been activated\n");
269 if (strncmp("nopav", parsestring, length) == 0) {
271 pr_info("'nopav' is not supported on z/VM\n");
274 pr_info("PAV support has be deactivated\n");
278 if (strncmp("nofcx", parsestring, length) == 0) {
280 pr_info("High Performance FICON support has been "
284 if (strncmp("fixedbuffers", parsestring, length) == 0) {
288 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
289 PAGE_SIZE, SLAB_CACHE_DMA,
291 if (!dasd_page_cache)
292 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
293 "fixed buffer mode disabled.");
295 DBF_EVENT(DBF_INFO, "%s",
296 "turning on fixed buffer mode");
299 return ERR_PTR(-EINVAL);
303 * Try to interprete the first element on the comma separated parse string
304 * as a device number or a range of devices. If the interpretation is
305 * successfull, create the matching dasd_devmap entries and return a pointer
306 * to the residual string.
307 * If interpretation fails or in case of an error, return an error code.
310 dasd_parse_range( char *parsestring ) {
312 struct dasd_devmap *devmap;
313 int from, from_id0, from_id1;
314 int to, to_id0, to_id1;
316 char bus_id[DASD_BUS_ID_SIZE+1], *str;
319 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
326 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
330 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
333 pr_err("%s is not a valid device range\n", parsestring);
336 features = dasd_feature_list(str, &str);
338 return ERR_PTR(-EINVAL);
339 /* each device in dasd= parameter should be set initially online */
340 features |= DASD_FEATURE_INITIAL_ONLINE;
342 sprintf(bus_id, "%01x.%01x.%04x",
343 from_id0, from_id1, from++);
344 devmap = dasd_add_busid(bus_id, features);
346 return (char *)devmap;
352 pr_warning("The dasd= parameter value %s has an invalid ending\n",
354 return ERR_PTR(-EINVAL);
358 dasd_parse_next_element( char *parsestring ) {
360 residual_str = dasd_parse_keyword(parsestring);
361 if (!IS_ERR(residual_str))
363 residual_str = dasd_parse_range(parsestring);
368 * Parse parameters stored in dasd[]
369 * The 'dasd=...' parameter allows to specify a comma separated list of
370 * keywords and device ranges. When the dasd driver is build into the kernel,
371 * the complete list will be stored as one element of the dasd[] array.
372 * When the dasd driver is build as a module, then the list is broken into
373 * it's elements and each dasd[] entry contains one element.
382 for (i = 0; i < 256; i++) {
385 parsestring = dasd[i];
386 /* loop over the comma separated list in the parsestring */
387 while (*parsestring) {
388 parsestring = dasd_parse_next_element(parsestring);
389 if(IS_ERR(parsestring)) {
390 rc = PTR_ERR(parsestring);
395 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
403 * Add a devmap for the device specified by busid. It is possible that
404 * the devmap already exists (dasd= parameter). The order of the devices
405 * added through this function will define the kdevs for the individual
408 static struct dasd_devmap *
409 dasd_add_busid(const char *bus_id, int features)
411 struct dasd_devmap *devmap, *new, *tmp;
414 new = (struct dasd_devmap *)
415 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 strncpy(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 /* Disconnect dasd_device structure from ccw_device structure. */
628 /* Put ccw_device structure. */
629 put_device(&cdev->dev);
631 /* Now the device structure can be freed. */
632 dasd_free_device(device);
636 * Reference counter dropped to zero. Wake up waiter
637 * in dasd_delete_device.
640 dasd_put_device_wake(struct dasd_device *device)
642 wake_up(&dasd_delete_wq);
644 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
647 * Return dasd_device structure associated with cdev.
648 * This function needs to be called with the ccw device
649 * lock held. It can be used from interrupt context.
652 dasd_device_from_cdev_locked(struct ccw_device *cdev)
654 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
657 return ERR_PTR(-ENODEV);
658 dasd_get_device(device);
663 * Return dasd_device structure associated with cdev.
666 dasd_device_from_cdev(struct ccw_device *cdev)
668 struct dasd_device *device;
671 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
672 device = dasd_device_from_cdev_locked(cdev);
673 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
678 * SECTION: files in sysfs
682 * failfast controls the behaviour, if no path is available
684 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
687 struct dasd_devmap *devmap;
690 devmap = dasd_find_busid(dev_name(dev));
692 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
694 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
695 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
698 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
699 const char *buf, size_t count)
701 struct dasd_devmap *devmap;
705 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
707 return PTR_ERR(devmap);
709 val = simple_strtoul(buf, &endp, 0);
710 if (((endp + 1) < (buf + count)) || (val > 1))
713 spin_lock(&dasd_devmap_lock);
715 devmap->features |= DASD_FEATURE_FAILFAST;
717 devmap->features &= ~DASD_FEATURE_FAILFAST;
719 devmap->device->features = devmap->features;
720 spin_unlock(&dasd_devmap_lock);
724 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
727 * readonly controls the readonly status of a dasd
730 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
732 struct dasd_devmap *devmap;
735 devmap = dasd_find_busid(dev_name(dev));
737 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
739 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
740 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
744 dasd_ro_store(struct device *dev, struct device_attribute *attr,
745 const char *buf, size_t count)
747 struct dasd_devmap *devmap;
748 struct dasd_device *device;
752 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
754 return PTR_ERR(devmap);
756 val = simple_strtoul(buf, &endp, 0);
757 if (((endp + 1) < (buf + count)) || (val > 1))
760 spin_lock(&dasd_devmap_lock);
762 devmap->features |= DASD_FEATURE_READONLY;
764 devmap->features &= ~DASD_FEATURE_READONLY;
765 device = devmap->device;
767 device->features = devmap->features;
768 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
770 spin_unlock(&dasd_devmap_lock);
771 if (device && device->block && device->block->gdp)
772 set_disk_ro(device->block->gdp, val);
776 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
778 * erplog controls the logging of ERP related data
779 * (e.g. failing channel programs).
782 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
784 struct dasd_devmap *devmap;
787 devmap = dasd_find_busid(dev_name(dev));
789 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
791 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
792 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
796 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
797 const char *buf, size_t count)
799 struct dasd_devmap *devmap;
803 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
805 return PTR_ERR(devmap);
807 val = simple_strtoul(buf, &endp, 0);
808 if (((endp + 1) < (buf + count)) || (val > 1))
811 spin_lock(&dasd_devmap_lock);
813 devmap->features |= DASD_FEATURE_ERPLOG;
815 devmap->features &= ~DASD_FEATURE_ERPLOG;
817 devmap->device->features = devmap->features;
818 spin_unlock(&dasd_devmap_lock);
822 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
825 * use_diag controls whether the driver should use diag rather than ssch
826 * to talk to the device
829 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
831 struct dasd_devmap *devmap;
834 devmap = dasd_find_busid(dev_name(dev));
836 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
838 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
839 return sprintf(buf, use_diag ? "1\n" : "0\n");
843 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
844 const char *buf, size_t count)
846 struct dasd_devmap *devmap;
851 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
853 return PTR_ERR(devmap);
855 val = simple_strtoul(buf, &endp, 0);
856 if (((endp + 1) < (buf + count)) || (val > 1))
859 spin_lock(&dasd_devmap_lock);
860 /* Changing diag discipline flag is only allowed in offline state. */
862 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
864 devmap->features |= DASD_FEATURE_USEDIAG;
866 devmap->features &= ~DASD_FEATURE_USEDIAG;
869 spin_unlock(&dasd_devmap_lock);
873 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
876 * use_raw controls whether the driver should give access to raw eckd data or
877 * operate in standard mode
880 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
882 struct dasd_devmap *devmap;
885 devmap = dasd_find_busid(dev_name(dev));
887 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
889 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
890 return sprintf(buf, use_raw ? "1\n" : "0\n");
894 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
895 const char *buf, size_t count)
897 struct dasd_devmap *devmap;
901 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
903 return PTR_ERR(devmap);
905 if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
908 spin_lock(&dasd_devmap_lock);
909 /* Changing diag discipline flag is only allowed in offline state. */
911 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
913 devmap->features |= DASD_FEATURE_USERAW;
915 devmap->features &= ~DASD_FEATURE_USERAW;
918 spin_unlock(&dasd_devmap_lock);
922 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
926 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
929 struct dasd_device *device;
932 device = dasd_device_from_cdev(to_ccwdev(dev));
935 else if (!device->discipline) {
936 dasd_put_device(device);
939 len = snprintf(buf, PAGE_SIZE, "%s\n",
940 device->discipline->name);
941 dasd_put_device(device);
945 len = snprintf(buf, PAGE_SIZE, "none\n");
949 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
952 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
955 struct dasd_device *device;
958 device = dasd_device_from_cdev(to_ccwdev(dev));
959 if (!IS_ERR(device)) {
960 switch (device->state) {
962 len = snprintf(buf, PAGE_SIZE, "new\n");
964 case DASD_STATE_KNOWN:
965 len = snprintf(buf, PAGE_SIZE, "detected\n");
967 case DASD_STATE_BASIC:
968 len = snprintf(buf, PAGE_SIZE, "basic\n");
970 case DASD_STATE_UNFMT:
971 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
973 case DASD_STATE_READY:
974 len = snprintf(buf, PAGE_SIZE, "ready\n");
976 case DASD_STATE_ONLINE:
977 len = snprintf(buf, PAGE_SIZE, "online\n");
980 len = snprintf(buf, PAGE_SIZE, "no stat\n");
983 dasd_put_device(device);
985 len = snprintf(buf, PAGE_SIZE, "unknown\n");
989 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
991 static ssize_t dasd_alias_show(struct device *dev,
992 struct device_attribute *attr, char *buf)
994 struct dasd_device *device;
997 device = dasd_device_from_cdev(to_ccwdev(dev));
999 return sprintf(buf, "0\n");
1001 if (device->discipline && device->discipline->get_uid &&
1002 !device->discipline->get_uid(device, &uid)) {
1003 if (uid.type == UA_BASE_PAV_ALIAS ||
1004 uid.type == UA_HYPER_PAV_ALIAS) {
1005 dasd_put_device(device);
1006 return sprintf(buf, "1\n");
1009 dasd_put_device(device);
1011 return sprintf(buf, "0\n");
1014 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1016 static ssize_t dasd_vendor_show(struct device *dev,
1017 struct device_attribute *attr, char *buf)
1019 struct dasd_device *device;
1020 struct dasd_uid uid;
1023 device = dasd_device_from_cdev(to_ccwdev(dev));
1026 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1028 if (device->discipline && device->discipline->get_uid &&
1029 !device->discipline->get_uid(device, &uid))
1030 vendor = uid.vendor;
1032 dasd_put_device(device);
1034 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1037 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1039 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1040 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1044 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1046 struct dasd_device *device;
1047 struct dasd_uid uid;
1048 char uid_string[UID_STRLEN];
1051 device = dasd_device_from_cdev(to_ccwdev(dev));
1054 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1056 if (device->discipline && device->discipline->get_uid &&
1057 !device->discipline->get_uid(device, &uid)) {
1059 case UA_BASE_DEVICE:
1060 snprintf(ua_string, sizeof(ua_string), "%02x",
1061 uid.real_unit_addr);
1063 case UA_BASE_PAV_ALIAS:
1064 snprintf(ua_string, sizeof(ua_string), "%02x",
1065 uid.base_unit_addr);
1067 case UA_HYPER_PAV_ALIAS:
1068 snprintf(ua_string, sizeof(ua_string), "xx");
1071 /* should not happen, treat like base device */
1072 snprintf(ua_string, sizeof(ua_string), "%02x",
1073 uid.real_unit_addr);
1077 if (strlen(uid.vduit) > 0)
1078 snprintf(uid_string, sizeof(uid_string),
1080 uid.vendor, uid.serial, uid.ssid, ua_string,
1083 snprintf(uid_string, sizeof(uid_string),
1085 uid.vendor, uid.serial, uid.ssid, ua_string);
1087 dasd_put_device(device);
1089 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1091 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1094 * extended error-reporting
1097 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1099 struct dasd_devmap *devmap;
1102 devmap = dasd_find_busid(dev_name(dev));
1103 if (!IS_ERR(devmap) && devmap->device)
1104 eer_flag = dasd_eer_enabled(devmap->device);
1107 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1111 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1112 const char *buf, size_t count)
1114 struct dasd_devmap *devmap;
1118 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1120 return PTR_ERR(devmap);
1121 if (!devmap->device)
1124 val = simple_strtoul(buf, &endp, 0);
1125 if (((endp + 1) < (buf + count)) || (val > 1))
1129 rc = dasd_eer_enable(devmap->device);
1133 dasd_eer_disable(devmap->device);
1137 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1140 * expiration time for default requests
1143 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1145 struct dasd_device *device;
1148 device = dasd_device_from_cdev(to_ccwdev(dev));
1151 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1152 dasd_put_device(device);
1157 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1158 const char *buf, size_t count)
1160 struct dasd_device *device;
1163 device = dasd_device_from_cdev(to_ccwdev(dev));
1167 if ((strict_strtoul(buf, 10, &val) != 0) ||
1168 (val > DASD_EXPIRES_MAX) || val == 0) {
1169 dasd_put_device(device);
1174 device->default_expires = val;
1176 dasd_put_device(device);
1180 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1182 static ssize_t dasd_reservation_policy_show(struct device *dev,
1183 struct device_attribute *attr,
1186 struct dasd_devmap *devmap;
1189 devmap = dasd_find_busid(dev_name(dev));
1190 if (IS_ERR(devmap)) {
1191 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1193 spin_lock(&dasd_devmap_lock);
1194 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1195 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1197 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1198 spin_unlock(&dasd_devmap_lock);
1203 static ssize_t dasd_reservation_policy_store(struct device *dev,
1204 struct device_attribute *attr,
1205 const char *buf, size_t count)
1207 struct dasd_devmap *devmap;
1210 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1212 return PTR_ERR(devmap);
1214 spin_lock(&dasd_devmap_lock);
1215 if (sysfs_streq("ignore", buf))
1216 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1217 else if (sysfs_streq("fail", buf))
1218 devmap->features |= DASD_FEATURE_FAILONSLCK;
1222 devmap->device->features = devmap->features;
1223 spin_unlock(&dasd_devmap_lock);
1230 static DEVICE_ATTR(reservation_policy, 0644,
1231 dasd_reservation_policy_show, dasd_reservation_policy_store);
1233 static ssize_t dasd_reservation_state_show(struct device *dev,
1234 struct device_attribute *attr,
1237 struct dasd_device *device;
1240 device = dasd_device_from_cdev(to_ccwdev(dev));
1242 return snprintf(buf, PAGE_SIZE, "none\n");
1244 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1245 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1246 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1247 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1249 rc = snprintf(buf, PAGE_SIZE, "none\n");
1250 dasd_put_device(device);
1254 static ssize_t dasd_reservation_state_store(struct device *dev,
1255 struct device_attribute *attr,
1256 const char *buf, size_t count)
1258 struct dasd_device *device;
1261 device = dasd_device_from_cdev(to_ccwdev(dev));
1264 if (sysfs_streq("reset", buf))
1265 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1268 dasd_put_device(device);
1276 static DEVICE_ATTR(last_known_reservation_state, 0644,
1277 dasd_reservation_state_show, dasd_reservation_state_store);
1279 static struct attribute * dasd_attrs[] = {
1280 &dev_attr_readonly.attr,
1281 &dev_attr_discipline.attr,
1282 &dev_attr_status.attr,
1283 &dev_attr_alias.attr,
1284 &dev_attr_vendor.attr,
1286 &dev_attr_use_diag.attr,
1287 &dev_attr_raw_track_access.attr,
1288 &dev_attr_eer_enabled.attr,
1289 &dev_attr_erplog.attr,
1290 &dev_attr_failfast.attr,
1291 &dev_attr_expires.attr,
1292 &dev_attr_reservation_policy.attr,
1293 &dev_attr_last_known_reservation_state.attr,
1297 static struct attribute_group dasd_attr_group = {
1298 .attrs = dasd_attrs,
1302 * Return value of the specified feature.
1305 dasd_get_feature(struct ccw_device *cdev, int feature)
1307 struct dasd_devmap *devmap;
1309 devmap = dasd_find_busid(dev_name(&cdev->dev));
1311 return PTR_ERR(devmap);
1313 return ((devmap->features & feature) != 0);
1317 * Set / reset given feature.
1318 * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1321 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1323 struct dasd_devmap *devmap;
1325 devmap = dasd_find_busid(dev_name(&cdev->dev));
1327 return PTR_ERR(devmap);
1329 spin_lock(&dasd_devmap_lock);
1331 devmap->features |= feature;
1333 devmap->features &= ~feature;
1335 devmap->device->features = devmap->features;
1336 spin_unlock(&dasd_devmap_lock);
1342 dasd_add_sysfs_files(struct ccw_device *cdev)
1344 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1348 dasd_remove_sysfs_files(struct ccw_device *cdev)
1350 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1355 dasd_devmap_init(void)
1359 /* Initialize devmap structures. */
1360 dasd_max_devindex = 0;
1361 for (i = 0; i < 256; i++)
1362 INIT_LIST_HEAD(&dasd_hashlists[i]);
1367 dasd_devmap_exit(void)
1369 dasd_forget_ranges();