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 #include <linux/ctype.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
20 #include <asm/debug.h>
21 #include <asm/uaccess.h>
25 #define PRINTK_HEADER "dasd_devmap:"
26 #define DASD_BUS_ID_SIZE 20
30 struct kmem_cache
*dasd_page_cache
;
31 EXPORT_SYMBOL_GPL(dasd_page_cache
);
34 * dasd_devmap_t is used to store the features and the relation
35 * between device number and device index. To find a dasd_devmap_t
36 * that corresponds to a device number of a device index each
37 * dasd_devmap_t is added to two linked lists, one to search by
38 * the device number and one to search by the device index. As
39 * soon as big minor numbers are available the device index list
40 * can be removed since the device number will then be identical
41 * to the device index.
44 struct list_head list
;
45 char bus_id
[DASD_BUS_ID_SIZE
];
46 unsigned int devindex
;
47 unsigned short features
;
48 struct dasd_device
*device
;
53 * Parameter parsing functions for dasd= parameter. The syntax is:
54 * <devno> : (0x)?[0-9a-fA-F]+
55 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
57 * <feature_list> : \(<feature>(:<feature>)*\)
58 * <devno-range> : <devno>(-<devno>)?<feature_list>?
59 * <busid-range> : <busid>(-<busid>)?<feature_list>?
60 * <devices> : <devno-range>|<busid-range>
61 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
63 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
66 int dasd_probeonly
= 0; /* is true, when probeonly mode is active */
67 int dasd_autodetect
= 0; /* is true, when autodetection is active */
68 int dasd_nopav
= 0; /* is true, when PAV is disabled */
69 EXPORT_SYMBOL_GPL(dasd_nopav
);
72 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
73 * it is named 'dasd' to directly be filled by insmod with the comma separated
74 * strings when running as a module.
76 static char *dasd
[256];
77 module_param_array(dasd
, charp
, NULL
, 0);
80 * Single spinlock to protect devmap and servermap structures and lists.
82 static DEFINE_SPINLOCK(dasd_devmap_lock
);
85 * Hash lists for devmap structures.
87 static struct list_head dasd_hashlists
[256];
88 int dasd_max_devindex
;
90 static struct dasd_devmap
*dasd_add_busid(const char *, int);
93 dasd_hash_busid(const char *bus_id
)
98 for (i
= 0; (i
< DASD_BUS_ID_SIZE
) && *bus_id
; i
++, bus_id
++)
105 * The parameter parsing functions for builtin-drivers are called
106 * before kmalloc works. Store the pointers to the parameters strings
107 * into dasd[] for later processing.
110 dasd_call_setup(char *str
)
112 static int count
= 0;
119 __setup ("dasd=", dasd_call_setup
);
120 #endif /* #ifndef MODULE */
122 #define DASD_IPLDEV "ipldev"
125 * Read a device busid/devno from a string.
128 dasd_busid(char **str
, int *id0
, int *id1
, int *devno
)
132 /* Interpret ipldev busid */
133 if (strncmp(DASD_IPLDEV
, *str
, strlen(DASD_IPLDEV
)) == 0) {
134 if (ipl_info
.type
!= IPL_TYPE_CCW
) {
135 MESSAGE(KERN_ERR
, "%s", "ipl device is not a ccw "
140 *id1
= ipl_info
.data
.ccw
.dev_id
.ssid
;
141 *devno
= ipl_info
.data
.ccw
.dev_id
.devno
;
142 *str
+= strlen(DASD_IPLDEV
);
146 /* check for leading '0x' */
148 if ((*str
)[0] == '0' && (*str
)[1] == 'x') {
152 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
154 val
= simple_strtoul(*str
, str
, 16);
155 if (old_style
|| (*str
)[0] != '.') {
157 if (val
< 0 || val
> 0xffff)
162 /* New style x.y.z busid */
163 if (val
< 0 || val
> 0xff)
167 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
169 val
= simple_strtoul(*str
, str
, 16);
170 if (val
< 0 || val
> 0xff || (*str
)++[0] != '.')
173 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
175 val
= simple_strtoul(*str
, str
, 16);
176 if (val
< 0 || val
> 0xffff)
183 * Read colon separated list of dasd features. Currently there is
184 * only one: "ro" for read-only devices. The default feature set
185 * is empty (value 0).
188 dasd_feature_list(char *str
, char **endp
)
190 int features
, len
, rc
;
195 return DASD_FEATURE_DEFAULT
;
202 str
[len
] && str
[len
] != ':' && str
[len
] != ')'; len
++);
203 if (len
== 2 && !strncmp(str
, "ro", 2))
204 features
|= DASD_FEATURE_READONLY
;
205 else if (len
== 4 && !strncmp(str
, "diag", 4))
206 features
|= DASD_FEATURE_USEDIAG
;
207 else if (len
== 6 && !strncmp(str
, "erplog", 6))
208 features
|= DASD_FEATURE_ERPLOG
;
210 MESSAGE(KERN_WARNING
,
211 "unsupported feature: %*s, "
212 "ignoring setting", len
, str
);
221 MESSAGE(KERN_WARNING
, "%s",
222 "missing ')' in dasd parameter string\n");
233 * Try to match the first element on the comma separated parse string
234 * with one of the known keywords. If a keyword is found, take the approprate
235 * action and return a pointer to the residual string. If the first element
236 * could not be matched to any keyword then return an error code.
239 dasd_parse_keyword( char *parsestring
) {
241 char *nextcomma
, *residual_str
;
244 nextcomma
= strchr(parsestring
,',');
246 length
= nextcomma
- parsestring
;
247 residual_str
= nextcomma
+ 1;
249 length
= strlen(parsestring
);
250 residual_str
= parsestring
+ length
;
252 if (strncmp("autodetect", parsestring
, length
) == 0) {
254 MESSAGE (KERN_INFO
, "%s",
255 "turning to autodetection mode");
258 if (strncmp("probeonly", parsestring
, length
) == 0) {
260 MESSAGE(KERN_INFO
, "%s",
261 "turning to probeonly mode");
264 if (strncmp("nopav", parsestring
, length
) == 0) {
266 MESSAGE(KERN_INFO
, "%s", "'nopav' not supported on VM");
269 MESSAGE(KERN_INFO
, "%s", "disable PAV mode");
273 if (strncmp("fixedbuffers", parsestring
, length
) == 0) {
277 kmem_cache_create("dasd_page_cache", PAGE_SIZE
,
278 PAGE_SIZE
, SLAB_CACHE_DMA
,
280 if (!dasd_page_cache
)
281 MESSAGE(KERN_WARNING
, "%s", "Failed to create slab, "
282 "fixed buffer mode disabled.");
284 MESSAGE (KERN_INFO
, "%s",
285 "turning on fixed buffer mode");
288 return ERR_PTR(-EINVAL
);
292 * Try to interprete the first element on the comma separated parse string
293 * as a device number or a range of devices. If the interpretation is
294 * successfull, create the matching dasd_devmap entries and return a pointer
295 * to the residual string.
296 * If interpretation fails or in case of an error, return an error code.
299 dasd_parse_range( char *parsestring
) {
301 struct dasd_devmap
*devmap
;
302 int from
, from_id0
, from_id1
;
303 int to
, to_id0
, to_id1
;
305 char bus_id
[DASD_BUS_ID_SIZE
+1], *str
;
308 rc
= dasd_busid(&str
, &from_id0
, &from_id1
, &from
);
315 rc
= dasd_busid(&str
, &to_id0
, &to_id1
, &to
);
319 (from_id0
!= to_id0
|| from_id1
!= to_id1
|| from
> to
))
322 MESSAGE(KERN_ERR
, "Invalid device range %s", parsestring
);
325 features
= dasd_feature_list(str
, &str
);
327 return ERR_PTR(-EINVAL
);
328 /* each device in dasd= parameter should be set initially online */
329 features
|= DASD_FEATURE_INITIAL_ONLINE
;
331 sprintf(bus_id
, "%01x.%01x.%04x",
332 from_id0
, from_id1
, from
++);
333 devmap
= dasd_add_busid(bus_id
, features
);
335 return (char *)devmap
;
341 MESSAGE(KERN_WARNING
,
342 "junk at end of dasd parameter string: %s\n", str
);
343 return ERR_PTR(-EINVAL
);
347 dasd_parse_next_element( char *parsestring
) {
349 residual_str
= dasd_parse_keyword(parsestring
);
350 if (!IS_ERR(residual_str
))
352 residual_str
= dasd_parse_range(parsestring
);
357 * Parse parameters stored in dasd[]
358 * The 'dasd=...' parameter allows to specify a comma separated list of
359 * keywords and device ranges. When the dasd driver is build into the kernel,
360 * the complete list will be stored as one element of the dasd[] array.
361 * When the dasd driver is build as a module, then the list is broken into
362 * it's elements and each dasd[] entry contains one element.
371 for (i
= 0; i
< 256; i
++) {
374 parsestring
= dasd
[i
];
375 /* loop over the comma separated list in the parsestring */
376 while (*parsestring
) {
377 parsestring
= dasd_parse_next_element(parsestring
);
378 if(IS_ERR(parsestring
)) {
379 rc
= PTR_ERR(parsestring
);
384 DBF_EVENT(DBF_ALERT
, "%s", "invalid range found");
392 * Add a devmap for the device specified by busid. It is possible that
393 * the devmap already exists (dasd= parameter). The order of the devices
394 * added through this function will define the kdevs for the individual
397 static struct dasd_devmap
*
398 dasd_add_busid(const char *bus_id
, int features
)
400 struct dasd_devmap
*devmap
, *new, *tmp
;
403 new = (struct dasd_devmap
*)
404 kzalloc(sizeof(struct dasd_devmap
), GFP_KERNEL
);
406 return ERR_PTR(-ENOMEM
);
407 spin_lock(&dasd_devmap_lock
);
409 hash
= dasd_hash_busid(bus_id
);
410 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
)
411 if (strncmp(tmp
->bus_id
, bus_id
, DASD_BUS_ID_SIZE
) == 0) {
416 /* This bus_id is new. */
417 new->devindex
= dasd_max_devindex
++;
418 strncpy(new->bus_id
, bus_id
, DASD_BUS_ID_SIZE
);
419 new->features
= features
;
421 list_add(&new->list
, &dasd_hashlists
[hash
]);
425 spin_unlock(&dasd_devmap_lock
);
431 * Find devmap for device with given bus_id.
433 static struct dasd_devmap
*
434 dasd_find_busid(const char *bus_id
)
436 struct dasd_devmap
*devmap
, *tmp
;
439 spin_lock(&dasd_devmap_lock
);
440 devmap
= ERR_PTR(-ENODEV
);
441 hash
= dasd_hash_busid(bus_id
);
442 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
) {
443 if (strncmp(tmp
->bus_id
, bus_id
, DASD_BUS_ID_SIZE
) == 0) {
448 spin_unlock(&dasd_devmap_lock
);
453 * Check if busid has been added to the list of dasd ranges.
456 dasd_busid_known(const char *bus_id
)
458 return IS_ERR(dasd_find_busid(bus_id
)) ? -ENOENT
: 0;
462 * Forget all about the device numbers added so far.
463 * This may only be called at module unload or system shutdown.
466 dasd_forget_ranges(void)
468 struct dasd_devmap
*devmap
, *n
;
471 spin_lock(&dasd_devmap_lock
);
472 for (i
= 0; i
< 256; i
++) {
473 list_for_each_entry_safe(devmap
, n
, &dasd_hashlists
[i
], list
) {
474 BUG_ON(devmap
->device
!= NULL
);
475 list_del(&devmap
->list
);
479 spin_unlock(&dasd_devmap_lock
);
483 * Find the device struct by its device index.
486 dasd_device_from_devindex(int devindex
)
488 struct dasd_devmap
*devmap
, *tmp
;
489 struct dasd_device
*device
;
492 spin_lock(&dasd_devmap_lock
);
494 for (i
= 0; (i
< 256) && !devmap
; i
++)
495 list_for_each_entry(tmp
, &dasd_hashlists
[i
], list
)
496 if (tmp
->devindex
== devindex
) {
497 /* Found the devmap for the device. */
501 if (devmap
&& devmap
->device
) {
502 device
= devmap
->device
;
503 dasd_get_device(device
);
505 device
= ERR_PTR(-ENODEV
);
506 spin_unlock(&dasd_devmap_lock
);
511 * Return devmap for cdev. If no devmap exists yet, create one and
512 * connect it to the cdev.
514 static struct dasd_devmap
*
515 dasd_devmap_from_cdev(struct ccw_device
*cdev
)
517 struct dasd_devmap
*devmap
;
519 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
521 devmap
= dasd_add_busid(dev_name(&cdev
->dev
),
522 DASD_FEATURE_DEFAULT
);
527 * Create a dasd device structure for cdev.
530 dasd_create_device(struct ccw_device
*cdev
)
532 struct dasd_devmap
*devmap
;
533 struct dasd_device
*device
;
537 devmap
= dasd_devmap_from_cdev(cdev
);
539 return (void *) devmap
;
541 device
= dasd_alloc_device();
544 atomic_set(&device
->ref_count
, 3);
546 spin_lock(&dasd_devmap_lock
);
547 if (!devmap
->device
) {
548 devmap
->device
= device
;
549 device
->devindex
= devmap
->devindex
;
550 device
->features
= devmap
->features
;
551 get_device(&cdev
->dev
);
555 /* Someone else was faster. */
557 spin_unlock(&dasd_devmap_lock
);
560 dasd_free_device(device
);
564 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
565 dev_set_drvdata(&cdev
->dev
, device
);
566 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
572 * Wait queue for dasd_delete_device waits.
574 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq
);
577 * Remove a dasd device structure. The passed referenced
581 dasd_delete_device(struct dasd_device
*device
)
583 struct ccw_device
*cdev
;
584 struct dasd_devmap
*devmap
;
587 /* First remove device pointer from devmap. */
588 devmap
= dasd_find_busid(dev_name(&device
->cdev
->dev
));
589 BUG_ON(IS_ERR(devmap
));
590 spin_lock(&dasd_devmap_lock
);
591 if (devmap
->device
!= device
) {
592 spin_unlock(&dasd_devmap_lock
);
593 dasd_put_device(device
);
596 devmap
->device
= NULL
;
597 spin_unlock(&dasd_devmap_lock
);
599 /* Disconnect dasd_device structure from ccw_device structure. */
600 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
601 dev_set_drvdata(&device
->cdev
->dev
, NULL
);
602 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
605 * Drop ref_count by 3, one for the devmap reference, one for
606 * the cdev reference and one for the passed reference.
608 atomic_sub(3, &device
->ref_count
);
610 /* Wait for reference counter to drop to zero. */
611 wait_event(dasd_delete_wq
, atomic_read(&device
->ref_count
) == 0);
613 /* Disconnect dasd_device structure from ccw_device structure. */
617 /* Put ccw_device structure. */
618 put_device(&cdev
->dev
);
620 /* Now the device structure can be freed. */
621 dasd_free_device(device
);
625 * Reference counter dropped to zero. Wake up waiter
626 * in dasd_delete_device.
629 dasd_put_device_wake(struct dasd_device
*device
)
631 wake_up(&dasd_delete_wq
);
635 * Return dasd_device structure associated with cdev.
636 * This function needs to be called with the ccw device
637 * lock held. It can be used from interrupt context.
640 dasd_device_from_cdev_locked(struct ccw_device
*cdev
)
642 struct dasd_device
*device
= dev_get_drvdata(&cdev
->dev
);
645 return ERR_PTR(-ENODEV
);
646 dasd_get_device(device
);
651 * Return dasd_device structure associated with cdev.
654 dasd_device_from_cdev(struct ccw_device
*cdev
)
656 struct dasd_device
*device
;
659 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
660 device
= dasd_device_from_cdev_locked(cdev
);
661 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
666 * SECTION: files in sysfs
670 * readonly controls the readonly status of a dasd
673 dasd_ro_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
675 struct dasd_devmap
*devmap
;
678 devmap
= dasd_find_busid(dev_name(dev
));
680 ro_flag
= (devmap
->features
& DASD_FEATURE_READONLY
) != 0;
682 ro_flag
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_READONLY
) != 0;
683 return snprintf(buf
, PAGE_SIZE
, ro_flag
? "1\n" : "0\n");
687 dasd_ro_store(struct device
*dev
, struct device_attribute
*attr
,
688 const char *buf
, size_t count
)
690 struct dasd_devmap
*devmap
;
694 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
696 return PTR_ERR(devmap
);
698 val
= simple_strtoul(buf
, &endp
, 0);
699 if (((endp
+ 1) < (buf
+ count
)) || (val
> 1))
702 spin_lock(&dasd_devmap_lock
);
704 devmap
->features
|= DASD_FEATURE_READONLY
;
706 devmap
->features
&= ~DASD_FEATURE_READONLY
;
708 devmap
->device
->features
= devmap
->features
;
709 if (devmap
->device
&& devmap
->device
->block
710 && devmap
->device
->block
->gdp
)
711 set_disk_ro(devmap
->device
->block
->gdp
, val
);
712 spin_unlock(&dasd_devmap_lock
);
716 static DEVICE_ATTR(readonly
, 0644, dasd_ro_show
, dasd_ro_store
);
718 * erplog controls the logging of ERP related data
719 * (e.g. failing channel programs).
722 dasd_erplog_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
724 struct dasd_devmap
*devmap
;
727 devmap
= dasd_find_busid(dev_name(dev
));
729 erplog
= (devmap
->features
& DASD_FEATURE_ERPLOG
) != 0;
731 erplog
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_ERPLOG
) != 0;
732 return snprintf(buf
, PAGE_SIZE
, erplog
? "1\n" : "0\n");
736 dasd_erplog_store(struct device
*dev
, struct device_attribute
*attr
,
737 const char *buf
, size_t count
)
739 struct dasd_devmap
*devmap
;
743 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
745 return PTR_ERR(devmap
);
747 val
= simple_strtoul(buf
, &endp
, 0);
748 if (((endp
+ 1) < (buf
+ count
)) || (val
> 1))
751 spin_lock(&dasd_devmap_lock
);
753 devmap
->features
|= DASD_FEATURE_ERPLOG
;
755 devmap
->features
&= ~DASD_FEATURE_ERPLOG
;
757 devmap
->device
->features
= devmap
->features
;
758 spin_unlock(&dasd_devmap_lock
);
762 static DEVICE_ATTR(erplog
, 0644, dasd_erplog_show
, dasd_erplog_store
);
765 * use_diag controls whether the driver should use diag rather than ssch
766 * to talk to the device
769 dasd_use_diag_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
771 struct dasd_devmap
*devmap
;
774 devmap
= dasd_find_busid(dev_name(dev
));
776 use_diag
= (devmap
->features
& DASD_FEATURE_USEDIAG
) != 0;
778 use_diag
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_USEDIAG
) != 0;
779 return sprintf(buf
, use_diag
? "1\n" : "0\n");
783 dasd_use_diag_store(struct device
*dev
, struct device_attribute
*attr
,
784 const char *buf
, size_t count
)
786 struct dasd_devmap
*devmap
;
791 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
793 return PTR_ERR(devmap
);
795 val
= simple_strtoul(buf
, &endp
, 0);
796 if (((endp
+ 1) < (buf
+ count
)) || (val
> 1))
799 spin_lock(&dasd_devmap_lock
);
800 /* Changing diag discipline flag is only allowed in offline state. */
802 if (!devmap
->device
) {
804 devmap
->features
|= DASD_FEATURE_USEDIAG
;
806 devmap
->features
&= ~DASD_FEATURE_USEDIAG
;
809 spin_unlock(&dasd_devmap_lock
);
813 static DEVICE_ATTR(use_diag
, 0644, dasd_use_diag_show
, dasd_use_diag_store
);
816 dasd_discipline_show(struct device
*dev
, struct device_attribute
*attr
,
819 struct dasd_device
*device
;
822 device
= dasd_device_from_cdev(to_ccwdev(dev
));
823 if (!IS_ERR(device
) && device
->discipline
) {
824 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
825 device
->discipline
->name
);
826 dasd_put_device(device
);
828 len
= snprintf(buf
, PAGE_SIZE
, "none\n");
832 static DEVICE_ATTR(discipline
, 0444, dasd_discipline_show
, NULL
);
835 dasd_device_status_show(struct device
*dev
, struct device_attribute
*attr
,
838 struct dasd_device
*device
;
841 device
= dasd_device_from_cdev(to_ccwdev(dev
));
842 if (!IS_ERR(device
)) {
843 switch (device
->state
) {
845 len
= snprintf(buf
, PAGE_SIZE
, "new\n");
847 case DASD_STATE_KNOWN
:
848 len
= snprintf(buf
, PAGE_SIZE
, "detected\n");
850 case DASD_STATE_BASIC
:
851 len
= snprintf(buf
, PAGE_SIZE
, "basic\n");
853 case DASD_STATE_UNFMT
:
854 len
= snprintf(buf
, PAGE_SIZE
, "unformatted\n");
856 case DASD_STATE_READY
:
857 len
= snprintf(buf
, PAGE_SIZE
, "ready\n");
859 case DASD_STATE_ONLINE
:
860 len
= snprintf(buf
, PAGE_SIZE
, "online\n");
863 len
= snprintf(buf
, PAGE_SIZE
, "no stat\n");
866 dasd_put_device(device
);
868 len
= snprintf(buf
, PAGE_SIZE
, "unknown\n");
872 static DEVICE_ATTR(status
, 0444, dasd_device_status_show
, NULL
);
875 dasd_alias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
877 struct dasd_devmap
*devmap
;
880 devmap
= dasd_find_busid(dev_name(dev
));
881 spin_lock(&dasd_devmap_lock
);
882 if (IS_ERR(devmap
) || strlen(devmap
->uid
.vendor
) == 0) {
883 spin_unlock(&dasd_devmap_lock
);
884 return sprintf(buf
, "0\n");
886 if (devmap
->uid
.type
== UA_BASE_PAV_ALIAS
||
887 devmap
->uid
.type
== UA_HYPER_PAV_ALIAS
)
891 spin_unlock(&dasd_devmap_lock
);
892 return sprintf(buf
, alias
? "1\n" : "0\n");
895 static DEVICE_ATTR(alias
, 0444, dasd_alias_show
, NULL
);
898 dasd_vendor_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
900 struct dasd_devmap
*devmap
;
903 devmap
= dasd_find_busid(dev_name(dev
));
904 spin_lock(&dasd_devmap_lock
);
905 if (!IS_ERR(devmap
) && strlen(devmap
->uid
.vendor
) > 0)
906 vendor
= devmap
->uid
.vendor
;
909 spin_unlock(&dasd_devmap_lock
);
911 return snprintf(buf
, PAGE_SIZE
, "%s\n", vendor
);
914 static DEVICE_ATTR(vendor
, 0444, dasd_vendor_show
, NULL
);
916 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
917 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
921 dasd_uid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
923 struct dasd_devmap
*devmap
;
924 char uid_string
[UID_STRLEN
];
926 struct dasd_uid
*uid
;
928 devmap
= dasd_find_busid(dev_name(dev
));
929 spin_lock(&dasd_devmap_lock
);
930 if (IS_ERR(devmap
) || strlen(devmap
->uid
.vendor
) == 0) {
931 spin_unlock(&dasd_devmap_lock
);
932 return sprintf(buf
, "\n");
937 sprintf(ua_string
, "%02x", uid
->real_unit_addr
);
939 case UA_BASE_PAV_ALIAS
:
940 sprintf(ua_string
, "%02x", uid
->base_unit_addr
);
942 case UA_HYPER_PAV_ALIAS
:
943 sprintf(ua_string
, "xx");
946 /* should not happen, treat like base device */
947 sprintf(ua_string
, "%02x", uid
->real_unit_addr
);
950 if (strlen(uid
->vduit
) > 0)
951 snprintf(uid_string
, sizeof(uid_string
),
953 uid
->vendor
, uid
->serial
,
954 uid
->ssid
, ua_string
,
957 snprintf(uid_string
, sizeof(uid_string
),
959 uid
->vendor
, uid
->serial
,
960 uid
->ssid
, ua_string
);
961 spin_unlock(&dasd_devmap_lock
);
962 return snprintf(buf
, PAGE_SIZE
, "%s\n", uid_string
);
965 static DEVICE_ATTR(uid
, 0444, dasd_uid_show
, NULL
);
968 * extended error-reporting
971 dasd_eer_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
973 struct dasd_devmap
*devmap
;
976 devmap
= dasd_find_busid(dev_name(dev
));
977 if (!IS_ERR(devmap
) && devmap
->device
)
978 eer_flag
= dasd_eer_enabled(devmap
->device
);
981 return snprintf(buf
, PAGE_SIZE
, eer_flag
? "1\n" : "0\n");
985 dasd_eer_store(struct device
*dev
, struct device_attribute
*attr
,
986 const char *buf
, size_t count
)
988 struct dasd_devmap
*devmap
;
992 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
994 return PTR_ERR(devmap
);
998 val
= simple_strtoul(buf
, &endp
, 0);
999 if (((endp
+ 1) < (buf
+ count
)) || (val
> 1))
1003 rc
= dasd_eer_enable(devmap
->device
);
1007 dasd_eer_disable(devmap
->device
);
1011 static DEVICE_ATTR(eer_enabled
, 0644, dasd_eer_show
, dasd_eer_store
);
1013 static struct attribute
* dasd_attrs
[] = {
1014 &dev_attr_readonly
.attr
,
1015 &dev_attr_discipline
.attr
,
1016 &dev_attr_status
.attr
,
1017 &dev_attr_alias
.attr
,
1018 &dev_attr_vendor
.attr
,
1020 &dev_attr_use_diag
.attr
,
1021 &dev_attr_eer_enabled
.attr
,
1022 &dev_attr_erplog
.attr
,
1026 static struct attribute_group dasd_attr_group
= {
1027 .attrs
= dasd_attrs
,
1031 * Return copy of the device unique identifier.
1034 dasd_get_uid(struct ccw_device
*cdev
, struct dasd_uid
*uid
)
1036 struct dasd_devmap
*devmap
;
1038 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
1040 return PTR_ERR(devmap
);
1041 spin_lock(&dasd_devmap_lock
);
1043 spin_unlock(&dasd_devmap_lock
);
1048 * Register the given device unique identifier into devmap struct.
1049 * In addition check if the related storage server subsystem ID is already
1050 * contained in the dasd_server_ssid_list. If subsystem ID is not contained,
1052 * Return 0 if server was already in serverlist,
1053 * 1 if the server was added successful
1054 * <0 in case of error.
1057 dasd_set_uid(struct ccw_device
*cdev
, struct dasd_uid
*uid
)
1059 struct dasd_devmap
*devmap
;
1061 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
1063 return PTR_ERR(devmap
);
1065 spin_lock(&dasd_devmap_lock
);
1067 spin_unlock(&dasd_devmap_lock
);
1071 EXPORT_SYMBOL_GPL(dasd_set_uid
);
1074 * Return value of the specified feature.
1077 dasd_get_feature(struct ccw_device
*cdev
, int feature
)
1079 struct dasd_devmap
*devmap
;
1081 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
1083 return PTR_ERR(devmap
);
1085 return ((devmap
->features
& feature
) != 0);
1089 * Set / reset given feature.
1090 * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1093 dasd_set_feature(struct ccw_device
*cdev
, int feature
, int flag
)
1095 struct dasd_devmap
*devmap
;
1097 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
1099 return PTR_ERR(devmap
);
1101 spin_lock(&dasd_devmap_lock
);
1103 devmap
->features
|= feature
;
1105 devmap
->features
&= ~feature
;
1107 devmap
->device
->features
= devmap
->features
;
1108 spin_unlock(&dasd_devmap_lock
);
1114 dasd_add_sysfs_files(struct ccw_device
*cdev
)
1116 return sysfs_create_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
1120 dasd_remove_sysfs_files(struct ccw_device
*cdev
)
1122 sysfs_remove_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
1127 dasd_devmap_init(void)
1131 /* Initialize devmap structures. */
1132 dasd_max_devindex
= 0;
1133 for (i
= 0; i
< 256; i
++)
1134 INIT_LIST_HEAD(&dasd_hashlists
[i
]);
1139 dasd_devmap_exit(void)
1141 dasd_forget_ranges();