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 * successful, 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);
677 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
679 struct dasd_devmap *devmap;
681 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
684 spin_lock(&dasd_devmap_lock);
685 gdp->private_data = devmap;
686 spin_unlock(&dasd_devmap_lock);
689 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
691 struct dasd_device *device;
692 struct dasd_devmap *devmap;
694 if (!gdp->private_data)
697 spin_lock(&dasd_devmap_lock);
698 devmap = gdp->private_data;
699 if (devmap && devmap->device) {
700 device = devmap->device;
701 dasd_get_device(device);
703 spin_unlock(&dasd_devmap_lock);
708 * SECTION: files in sysfs
712 * failfast controls the behaviour, if no path is available
714 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
717 struct dasd_devmap *devmap;
720 devmap = dasd_find_busid(dev_name(dev));
722 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
724 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
725 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
728 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
729 const char *buf, size_t count)
731 struct dasd_devmap *devmap;
735 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
737 return PTR_ERR(devmap);
739 val = simple_strtoul(buf, &endp, 0);
740 if (((endp + 1) < (buf + count)) || (val > 1))
743 spin_lock(&dasd_devmap_lock);
745 devmap->features |= DASD_FEATURE_FAILFAST;
747 devmap->features &= ~DASD_FEATURE_FAILFAST;
749 devmap->device->features = devmap->features;
750 spin_unlock(&dasd_devmap_lock);
754 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
757 * readonly controls the readonly status of a dasd
760 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
762 struct dasd_devmap *devmap;
765 devmap = dasd_find_busid(dev_name(dev));
767 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
769 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
770 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
774 dasd_ro_store(struct device *dev, struct device_attribute *attr,
775 const char *buf, size_t count)
777 struct dasd_devmap *devmap;
778 struct dasd_device *device;
782 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
784 return PTR_ERR(devmap);
786 val = simple_strtoul(buf, &endp, 0);
787 if (((endp + 1) < (buf + count)) || (val > 1))
790 spin_lock(&dasd_devmap_lock);
792 devmap->features |= DASD_FEATURE_READONLY;
794 devmap->features &= ~DASD_FEATURE_READONLY;
795 device = devmap->device;
797 device->features = devmap->features;
798 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
800 spin_unlock(&dasd_devmap_lock);
801 if (device && device->block && device->block->gdp)
802 set_disk_ro(device->block->gdp, val);
806 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
808 * erplog controls the logging of ERP related data
809 * (e.g. failing channel programs).
812 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
814 struct dasd_devmap *devmap;
817 devmap = dasd_find_busid(dev_name(dev));
819 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
821 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
822 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
826 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
827 const char *buf, size_t count)
829 struct dasd_devmap *devmap;
833 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
835 return PTR_ERR(devmap);
837 val = simple_strtoul(buf, &endp, 0);
838 if (((endp + 1) < (buf + count)) || (val > 1))
841 spin_lock(&dasd_devmap_lock);
843 devmap->features |= DASD_FEATURE_ERPLOG;
845 devmap->features &= ~DASD_FEATURE_ERPLOG;
847 devmap->device->features = devmap->features;
848 spin_unlock(&dasd_devmap_lock);
852 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
855 * use_diag controls whether the driver should use diag rather than ssch
856 * to talk to the device
859 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
861 struct dasd_devmap *devmap;
864 devmap = dasd_find_busid(dev_name(dev));
866 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
868 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
869 return sprintf(buf, use_diag ? "1\n" : "0\n");
873 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
874 const char *buf, size_t count)
876 struct dasd_devmap *devmap;
881 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
883 return PTR_ERR(devmap);
885 val = simple_strtoul(buf, &endp, 0);
886 if (((endp + 1) < (buf + count)) || (val > 1))
889 spin_lock(&dasd_devmap_lock);
890 /* Changing diag discipline flag is only allowed in offline state. */
892 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
894 devmap->features |= DASD_FEATURE_USEDIAG;
896 devmap->features &= ~DASD_FEATURE_USEDIAG;
899 spin_unlock(&dasd_devmap_lock);
903 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
906 * use_raw controls whether the driver should give access to raw eckd data or
907 * operate in standard mode
910 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
912 struct dasd_devmap *devmap;
915 devmap = dasd_find_busid(dev_name(dev));
917 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
919 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
920 return sprintf(buf, use_raw ? "1\n" : "0\n");
924 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
925 const char *buf, size_t count)
927 struct dasd_devmap *devmap;
931 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
933 return PTR_ERR(devmap);
935 if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
938 spin_lock(&dasd_devmap_lock);
939 /* Changing diag discipline flag is only allowed in offline state. */
941 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
943 devmap->features |= DASD_FEATURE_USERAW;
945 devmap->features &= ~DASD_FEATURE_USERAW;
948 spin_unlock(&dasd_devmap_lock);
952 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
956 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
959 struct dasd_device *device;
962 device = dasd_device_from_cdev(to_ccwdev(dev));
965 else if (!device->discipline) {
966 dasd_put_device(device);
969 len = snprintf(buf, PAGE_SIZE, "%s\n",
970 device->discipline->name);
971 dasd_put_device(device);
975 len = snprintf(buf, PAGE_SIZE, "none\n");
979 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
982 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
985 struct dasd_device *device;
988 device = dasd_device_from_cdev(to_ccwdev(dev));
989 if (!IS_ERR(device)) {
990 switch (device->state) {
992 len = snprintf(buf, PAGE_SIZE, "new\n");
994 case DASD_STATE_KNOWN:
995 len = snprintf(buf, PAGE_SIZE, "detected\n");
997 case DASD_STATE_BASIC:
998 len = snprintf(buf, PAGE_SIZE, "basic\n");
1000 case DASD_STATE_UNFMT:
1001 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1003 case DASD_STATE_READY:
1004 len = snprintf(buf, PAGE_SIZE, "ready\n");
1006 case DASD_STATE_ONLINE:
1007 len = snprintf(buf, PAGE_SIZE, "online\n");
1010 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1013 dasd_put_device(device);
1015 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1019 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1021 static ssize_t dasd_alias_show(struct device *dev,
1022 struct device_attribute *attr, char *buf)
1024 struct dasd_device *device;
1025 struct dasd_uid uid;
1027 device = dasd_device_from_cdev(to_ccwdev(dev));
1029 return sprintf(buf, "0\n");
1031 if (device->discipline && device->discipline->get_uid &&
1032 !device->discipline->get_uid(device, &uid)) {
1033 if (uid.type == UA_BASE_PAV_ALIAS ||
1034 uid.type == UA_HYPER_PAV_ALIAS) {
1035 dasd_put_device(device);
1036 return sprintf(buf, "1\n");
1039 dasd_put_device(device);
1041 return sprintf(buf, "0\n");
1044 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1046 static ssize_t dasd_vendor_show(struct device *dev,
1047 struct device_attribute *attr, char *buf)
1049 struct dasd_device *device;
1050 struct dasd_uid uid;
1053 device = dasd_device_from_cdev(to_ccwdev(dev));
1056 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1058 if (device->discipline && device->discipline->get_uid &&
1059 !device->discipline->get_uid(device, &uid))
1060 vendor = uid.vendor;
1062 dasd_put_device(device);
1064 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1067 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1069 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1070 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1074 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1076 struct dasd_device *device;
1077 struct dasd_uid uid;
1078 char uid_string[UID_STRLEN];
1081 device = dasd_device_from_cdev(to_ccwdev(dev));
1084 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1086 if (device->discipline && device->discipline->get_uid &&
1087 !device->discipline->get_uid(device, &uid)) {
1089 case UA_BASE_DEVICE:
1090 snprintf(ua_string, sizeof(ua_string), "%02x",
1091 uid.real_unit_addr);
1093 case UA_BASE_PAV_ALIAS:
1094 snprintf(ua_string, sizeof(ua_string), "%02x",
1095 uid.base_unit_addr);
1097 case UA_HYPER_PAV_ALIAS:
1098 snprintf(ua_string, sizeof(ua_string), "xx");
1101 /* should not happen, treat like base device */
1102 snprintf(ua_string, sizeof(ua_string), "%02x",
1103 uid.real_unit_addr);
1107 if (strlen(uid.vduit) > 0)
1108 snprintf(uid_string, sizeof(uid_string),
1110 uid.vendor, uid.serial, uid.ssid, ua_string,
1113 snprintf(uid_string, sizeof(uid_string),
1115 uid.vendor, uid.serial, uid.ssid, ua_string);
1117 dasd_put_device(device);
1119 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1121 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1124 * extended error-reporting
1127 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1129 struct dasd_devmap *devmap;
1132 devmap = dasd_find_busid(dev_name(dev));
1133 if (!IS_ERR(devmap) && devmap->device)
1134 eer_flag = dasd_eer_enabled(devmap->device);
1137 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1141 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1142 const char *buf, size_t count)
1144 struct dasd_devmap *devmap;
1148 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1150 return PTR_ERR(devmap);
1151 if (!devmap->device)
1154 val = simple_strtoul(buf, &endp, 0);
1155 if (((endp + 1) < (buf + count)) || (val > 1))
1159 rc = dasd_eer_enable(devmap->device);
1163 dasd_eer_disable(devmap->device);
1167 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1170 * expiration time for default requests
1173 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1175 struct dasd_device *device;
1178 device = dasd_device_from_cdev(to_ccwdev(dev));
1181 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1182 dasd_put_device(device);
1187 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1188 const char *buf, size_t count)
1190 struct dasd_device *device;
1193 device = dasd_device_from_cdev(to_ccwdev(dev));
1197 if ((strict_strtoul(buf, 10, &val) != 0) ||
1198 (val > DASD_EXPIRES_MAX) || val == 0) {
1199 dasd_put_device(device);
1204 device->default_expires = val;
1206 dasd_put_device(device);
1210 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1212 static ssize_t dasd_reservation_policy_show(struct device *dev,
1213 struct device_attribute *attr,
1216 struct dasd_devmap *devmap;
1219 devmap = dasd_find_busid(dev_name(dev));
1220 if (IS_ERR(devmap)) {
1221 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1223 spin_lock(&dasd_devmap_lock);
1224 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1225 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1227 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1228 spin_unlock(&dasd_devmap_lock);
1233 static ssize_t dasd_reservation_policy_store(struct device *dev,
1234 struct device_attribute *attr,
1235 const char *buf, size_t count)
1237 struct dasd_devmap *devmap;
1240 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1242 return PTR_ERR(devmap);
1244 spin_lock(&dasd_devmap_lock);
1245 if (sysfs_streq("ignore", buf))
1246 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1247 else if (sysfs_streq("fail", buf))
1248 devmap->features |= DASD_FEATURE_FAILONSLCK;
1252 devmap->device->features = devmap->features;
1253 spin_unlock(&dasd_devmap_lock);
1260 static DEVICE_ATTR(reservation_policy, 0644,
1261 dasd_reservation_policy_show, dasd_reservation_policy_store);
1263 static ssize_t dasd_reservation_state_show(struct device *dev,
1264 struct device_attribute *attr,
1267 struct dasd_device *device;
1270 device = dasd_device_from_cdev(to_ccwdev(dev));
1272 return snprintf(buf, PAGE_SIZE, "none\n");
1274 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1275 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1276 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1277 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1279 rc = snprintf(buf, PAGE_SIZE, "none\n");
1280 dasd_put_device(device);
1284 static ssize_t dasd_reservation_state_store(struct device *dev,
1285 struct device_attribute *attr,
1286 const char *buf, size_t count)
1288 struct dasd_device *device;
1291 device = dasd_device_from_cdev(to_ccwdev(dev));
1294 if (sysfs_streq("reset", buf))
1295 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1298 dasd_put_device(device);
1306 static DEVICE_ATTR(last_known_reservation_state, 0644,
1307 dasd_reservation_state_show, dasd_reservation_state_store);
1309 static struct attribute * dasd_attrs[] = {
1310 &dev_attr_readonly.attr,
1311 &dev_attr_discipline.attr,
1312 &dev_attr_status.attr,
1313 &dev_attr_alias.attr,
1314 &dev_attr_vendor.attr,
1316 &dev_attr_use_diag.attr,
1317 &dev_attr_raw_track_access.attr,
1318 &dev_attr_eer_enabled.attr,
1319 &dev_attr_erplog.attr,
1320 &dev_attr_failfast.attr,
1321 &dev_attr_expires.attr,
1322 &dev_attr_reservation_policy.attr,
1323 &dev_attr_last_known_reservation_state.attr,
1327 static struct attribute_group dasd_attr_group = {
1328 .attrs = dasd_attrs,
1332 * Return value of the specified feature.
1335 dasd_get_feature(struct ccw_device *cdev, int feature)
1337 struct dasd_devmap *devmap;
1339 devmap = dasd_find_busid(dev_name(&cdev->dev));
1341 return PTR_ERR(devmap);
1343 return ((devmap->features & feature) != 0);
1347 * Set / reset given feature.
1348 * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1351 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1353 struct dasd_devmap *devmap;
1355 devmap = dasd_find_busid(dev_name(&cdev->dev));
1357 return PTR_ERR(devmap);
1359 spin_lock(&dasd_devmap_lock);
1361 devmap->features |= feature;
1363 devmap->features &= ~feature;
1365 devmap->device->features = devmap->features;
1366 spin_unlock(&dasd_devmap_lock);
1372 dasd_add_sysfs_files(struct ccw_device *cdev)
1374 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1378 dasd_remove_sysfs_files(struct ccw_device *cdev)
1380 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1385 dasd_devmap_init(void)
1389 /* Initialize devmap structures. */
1390 dasd_max_devindex = 0;
1391 for (i = 0; i < 256; i++)
1392 INIT_LIST_HEAD(&dasd_hashlists[i]);
1397 dasd_devmap_exit(void)
1399 dasd_forget_ranges();