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>
24 #define PRINTK_HEADER "dasd_devmap:"
28 kmem_cache_t
*dasd_page_cache
;
29 EXPORT_SYMBOL_GPL(dasd_page_cache
);
32 * dasd_devmap_t is used to store the features and the relation
33 * between device number and device index. To find a dasd_devmap_t
34 * that corresponds to a device number of a device index each
35 * dasd_devmap_t is added to two linked lists, one to search by
36 * the device number and one to search by the device index. As
37 * soon as big minor numbers are available the device index list
38 * can be removed since the device number will then be identical
39 * to the device index.
42 struct list_head list
;
43 char bus_id
[BUS_ID_SIZE
];
44 unsigned int devindex
;
45 unsigned short features
;
46 struct dasd_device
*device
;
51 * dasd_server_ssid_map contains a globally unique storage server subsystem ID.
52 * dasd_server_ssid_list contains the list of all subsystem IDs accessed by
53 * the DASD device driver.
55 struct dasd_server_ssid_map
{
56 struct list_head list
;
64 static struct list_head dasd_server_ssid_list
;
67 * Parameter parsing functions for dasd= parameter. The syntax is:
68 * <devno> : (0x)?[0-9a-fA-F]+
69 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
71 * <feature_list> : \(<feature>(:<feature>)*\)
72 * <devno-range> : <devno>(-<devno>)?<feature_list>?
73 * <busid-range> : <busid>(-<busid>)?<feature_list>?
74 * <devices> : <devno-range>|<busid-range>
75 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
77 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
80 int dasd_probeonly
= 0; /* is true, when probeonly mode is active */
81 int dasd_autodetect
= 0; /* is true, when autodetection is active */
82 int dasd_nopav
= 0; /* is true, when PAV is disabled */
83 EXPORT_SYMBOL_GPL(dasd_nopav
);
86 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
87 * it is named 'dasd' to directly be filled by insmod with the comma separated
88 * strings when running as a module.
90 static char *dasd
[256];
91 module_param_array(dasd
, charp
, NULL
, 0);
94 * Single spinlock to protect devmap and servermap structures and lists.
96 static DEFINE_SPINLOCK(dasd_devmap_lock
);
99 * Hash lists for devmap structures.
101 static struct list_head dasd_hashlists
[256];
102 int dasd_max_devindex
;
104 static struct dasd_devmap
*dasd_add_busid(char *, int);
107 dasd_hash_busid(char *bus_id
)
112 for (i
= 0; (i
< BUS_ID_SIZE
) && *bus_id
; i
++, bus_id
++)
119 * The parameter parsing functions for builtin-drivers are called
120 * before kmalloc works. Store the pointers to the parameters strings
121 * into dasd[] for later processing.
124 dasd_call_setup(char *str
)
126 static int count
= 0;
133 __setup ("dasd=", dasd_call_setup
);
134 #endif /* #ifndef MODULE */
137 * Read a device busid/devno from a string.
140 dasd_busid(char **str
, int *id0
, int *id1
, int *devno
)
144 /* check for leading '0x' */
146 if ((*str
)[0] == '0' && (*str
)[1] == 'x') {
150 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
152 val
= simple_strtoul(*str
, str
, 16);
153 if (old_style
|| (*str
)[0] != '.') {
155 if (val
< 0 || val
> 0xffff)
160 /* New style x.y.z busid */
161 if (val
< 0 || val
> 0xff)
165 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
167 val
= simple_strtoul(*str
, str
, 16);
168 if (val
< 0 || val
> 0xff || (*str
)++[0] != '.')
171 if (!isxdigit((*str
)[0])) /* We require at least one hex digit */
173 val
= simple_strtoul(*str
, str
, 16);
174 if (val
< 0 || val
> 0xffff)
181 * Read colon separated list of dasd features. Currently there is
182 * only one: "ro" for read-only devices. The default feature set
183 * is empty (value 0).
186 dasd_feature_list(char *str
, char **endp
)
188 int features
, len
, rc
;
193 return DASD_FEATURE_DEFAULT
;
200 str
[len
] && str
[len
] != ':' && str
[len
] != ')'; len
++);
201 if (len
== 2 && !strncmp(str
, "ro", 2))
202 features
|= DASD_FEATURE_READONLY
;
203 else if (len
== 4 && !strncmp(str
, "diag", 4))
204 features
|= DASD_FEATURE_USEDIAG
;
206 MESSAGE(KERN_WARNING
,
207 "unsupported feature: %*s, "
208 "ignoring setting", len
, str
);
217 MESSAGE(KERN_WARNING
, "%s",
218 "missing ')' in dasd parameter string\n");
229 * Try to match the first element on the comma separated parse string
230 * with one of the known keywords. If a keyword is found, take the approprate
231 * action and return a pointer to the residual string. If the first element
232 * could not be matched to any keyword then return an error code.
235 dasd_parse_keyword( char *parsestring
) {
237 char *nextcomma
, *residual_str
;
240 nextcomma
= strchr(parsestring
,',');
242 length
= nextcomma
- parsestring
;
243 residual_str
= nextcomma
+ 1;
245 length
= strlen(parsestring
);
246 residual_str
= parsestring
+ length
;
248 if (strncmp("autodetect", parsestring
, length
) == 0) {
250 MESSAGE (KERN_INFO
, "%s",
251 "turning to autodetection mode");
254 if (strncmp("probeonly", parsestring
, length
) == 0) {
256 MESSAGE(KERN_INFO
, "%s",
257 "turning to probeonly mode");
260 if (strncmp("nopav", parsestring
, length
) == 0) {
262 MESSAGE(KERN_INFO
, "%s", "disable PAV mode");
265 if (strncmp("fixedbuffers", parsestring
, length
) == 0) {
269 kmem_cache_create("dasd_page_cache", PAGE_SIZE
,
270 PAGE_SIZE
, SLAB_CACHE_DMA
,
272 if (!dasd_page_cache
)
273 MESSAGE(KERN_WARNING
, "%s", "Failed to create slab, "
274 "fixed buffer mode disabled.");
276 MESSAGE (KERN_INFO
, "%s",
277 "turning on fixed buffer mode");
280 return ERR_PTR(-EINVAL
);
284 * Try to interprete the first element on the comma separated parse string
285 * as a device number or a range of devices. If the interpretation is
286 * successfull, create the matching dasd_devmap entries and return a pointer
287 * to the residual string.
288 * If interpretation fails or in case of an error, return an error code.
291 dasd_parse_range( char *parsestring
) {
293 struct dasd_devmap
*devmap
;
294 int from
, from_id0
, from_id1
;
295 int to
, to_id0
, to_id1
;
297 char bus_id
[BUS_ID_SIZE
+1], *str
;
300 rc
= dasd_busid(&str
, &from_id0
, &from_id1
, &from
);
307 rc
= dasd_busid(&str
, &to_id0
, &to_id1
, &to
);
311 (from_id0
!= to_id0
|| from_id1
!= to_id1
|| from
> to
))
314 MESSAGE(KERN_ERR
, "Invalid device range %s", parsestring
);
317 features
= dasd_feature_list(str
, &str
);
319 return ERR_PTR(-EINVAL
);
320 /* each device in dasd= parameter should be set initially online */
321 features
|= DASD_FEATURE_INITIAL_ONLINE
;
323 sprintf(bus_id
, "%01x.%01x.%04x",
324 from_id0
, from_id1
, from
++);
325 devmap
= dasd_add_busid(bus_id
, features
);
327 return (char *)devmap
;
333 MESSAGE(KERN_WARNING
,
334 "junk at end of dasd parameter string: %s\n", str
);
335 return ERR_PTR(-EINVAL
);
339 dasd_parse_next_element( char *parsestring
) {
341 residual_str
= dasd_parse_keyword(parsestring
);
342 if (!IS_ERR(residual_str
))
344 residual_str
= dasd_parse_range(parsestring
);
349 * Parse parameters stored in dasd[]
350 * The 'dasd=...' parameter allows to specify a comma separated list of
351 * keywords and device ranges. When the dasd driver is build into the kernel,
352 * the complete list will be stored as one element of the dasd[] array.
353 * When the dasd driver is build as a module, then the list is broken into
354 * it's elements and each dasd[] entry contains one element.
363 for (i
= 0; i
< 256; i
++) {
366 parsestring
= dasd
[i
];
367 /* loop over the comma separated list in the parsestring */
368 while (*parsestring
) {
369 parsestring
= dasd_parse_next_element(parsestring
);
370 if(IS_ERR(parsestring
)) {
371 rc
= PTR_ERR(parsestring
);
376 DBF_EVENT(DBF_ALERT
, "%s", "invalid range found");
384 * Add a devmap for the device specified by busid. It is possible that
385 * the devmap already exists (dasd= parameter). The order of the devices
386 * added through this function will define the kdevs for the individual
389 static struct dasd_devmap
*
390 dasd_add_busid(char *bus_id
, int features
)
392 struct dasd_devmap
*devmap
, *new, *tmp
;
395 new = (struct dasd_devmap
*)
396 kzalloc(sizeof(struct dasd_devmap
), GFP_KERNEL
);
398 return ERR_PTR(-ENOMEM
);
399 spin_lock(&dasd_devmap_lock
);
401 hash
= dasd_hash_busid(bus_id
);
402 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
)
403 if (strncmp(tmp
->bus_id
, bus_id
, BUS_ID_SIZE
) == 0) {
408 /* This bus_id is new. */
409 new->devindex
= dasd_max_devindex
++;
410 strncpy(new->bus_id
, bus_id
, BUS_ID_SIZE
);
411 new->features
= features
;
413 list_add(&new->list
, &dasd_hashlists
[hash
]);
417 spin_unlock(&dasd_devmap_lock
);
423 * Find devmap for device with given bus_id.
425 static struct dasd_devmap
*
426 dasd_find_busid(char *bus_id
)
428 struct dasd_devmap
*devmap
, *tmp
;
431 spin_lock(&dasd_devmap_lock
);
432 devmap
= ERR_PTR(-ENODEV
);
433 hash
= dasd_hash_busid(bus_id
);
434 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
) {
435 if (strncmp(tmp
->bus_id
, bus_id
, BUS_ID_SIZE
) == 0) {
440 spin_unlock(&dasd_devmap_lock
);
445 * Check if busid has been added to the list of dasd ranges.
448 dasd_busid_known(char *bus_id
)
450 return IS_ERR(dasd_find_busid(bus_id
)) ? -ENOENT
: 0;
454 * Forget all about the device numbers added so far.
455 * This may only be called at module unload or system shutdown.
458 dasd_forget_ranges(void)
460 struct dasd_devmap
*devmap
, *n
;
463 spin_lock(&dasd_devmap_lock
);
464 for (i
= 0; i
< 256; i
++) {
465 list_for_each_entry_safe(devmap
, n
, &dasd_hashlists
[i
], list
) {
466 BUG_ON(devmap
->device
!= NULL
);
467 list_del(&devmap
->list
);
471 spin_unlock(&dasd_devmap_lock
);
475 * Find the device struct by its device index.
478 dasd_device_from_devindex(int devindex
)
480 struct dasd_devmap
*devmap
, *tmp
;
481 struct dasd_device
*device
;
484 spin_lock(&dasd_devmap_lock
);
486 for (i
= 0; (i
< 256) && !devmap
; i
++)
487 list_for_each_entry(tmp
, &dasd_hashlists
[i
], list
)
488 if (tmp
->devindex
== devindex
) {
489 /* Found the devmap for the device. */
493 if (devmap
&& devmap
->device
) {
494 device
= devmap
->device
;
495 dasd_get_device(device
);
497 device
= ERR_PTR(-ENODEV
);
498 spin_unlock(&dasd_devmap_lock
);
503 * Return devmap for cdev. If no devmap exists yet, create one and
504 * connect it to the cdev.
506 static struct dasd_devmap
*
507 dasd_devmap_from_cdev(struct ccw_device
*cdev
)
509 struct dasd_devmap
*devmap
;
511 devmap
= dasd_find_busid(cdev
->dev
.bus_id
);
513 devmap
= dasd_add_busid(cdev
->dev
.bus_id
,
514 DASD_FEATURE_DEFAULT
);
519 * Create a dasd device structure for cdev.
522 dasd_create_device(struct ccw_device
*cdev
)
524 struct dasd_devmap
*devmap
;
525 struct dasd_device
*device
;
528 devmap
= dasd_devmap_from_cdev(cdev
);
530 return (void *) devmap
;
531 cdev
->dev
.driver_data
= devmap
;
533 device
= dasd_alloc_device();
536 atomic_set(&device
->ref_count
, 2);
538 spin_lock(&dasd_devmap_lock
);
539 if (!devmap
->device
) {
540 devmap
->device
= device
;
541 device
->devindex
= devmap
->devindex
;
542 device
->features
= devmap
->features
;
543 get_device(&cdev
->dev
);
547 /* Someone else was faster. */
549 spin_unlock(&dasd_devmap_lock
);
552 dasd_free_device(device
);
559 * Wait queue for dasd_delete_device waits.
561 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq
);
564 * Remove a dasd device structure. The passed referenced
568 dasd_delete_device(struct dasd_device
*device
)
570 struct ccw_device
*cdev
;
571 struct dasd_devmap
*devmap
;
573 /* First remove device pointer from devmap. */
574 devmap
= dasd_find_busid(device
->cdev
->dev
.bus_id
);
575 BUG_ON(IS_ERR(devmap
));
576 spin_lock(&dasd_devmap_lock
);
577 if (devmap
->device
!= device
) {
578 spin_unlock(&dasd_devmap_lock
);
579 dasd_put_device(device
);
582 devmap
->device
= NULL
;
583 spin_unlock(&dasd_devmap_lock
);
585 /* Drop ref_count by 2, one for the devmap reference and
586 * one for the passed reference. */
587 atomic_sub(2, &device
->ref_count
);
589 /* Wait for reference counter to drop to zero. */
590 wait_event(dasd_delete_wq
, atomic_read(&device
->ref_count
) == 0);
592 /* Disconnect dasd_device structure from ccw_device structure. */
596 /* Disconnect dasd_devmap structure from ccw_device structure. */
597 cdev
->dev
.driver_data
= NULL
;
599 /* Put ccw_device structure. */
600 put_device(&cdev
->dev
);
602 /* Now the device structure can be freed. */
603 dasd_free_device(device
);
607 * Reference counter dropped to zero. Wake up waiter
608 * in dasd_delete_device.
611 dasd_put_device_wake(struct dasd_device
*device
)
613 wake_up(&dasd_delete_wq
);
617 * Return dasd_device structure associated with cdev.
620 dasd_device_from_cdev(struct ccw_device
*cdev
)
622 struct dasd_devmap
*devmap
;
623 struct dasd_device
*device
;
625 device
= ERR_PTR(-ENODEV
);
626 spin_lock(&dasd_devmap_lock
);
627 devmap
= cdev
->dev
.driver_data
;
628 if (devmap
&& devmap
->device
) {
629 device
= devmap
->device
;
630 dasd_get_device(device
);
632 spin_unlock(&dasd_devmap_lock
);
637 * SECTION: files in sysfs
641 * readonly controls the readonly status of a dasd
644 dasd_ro_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
646 struct dasd_devmap
*devmap
;
649 devmap
= dasd_find_busid(dev
->bus_id
);
651 ro_flag
= (devmap
->features
& DASD_FEATURE_READONLY
) != 0;
653 ro_flag
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_READONLY
) != 0;
654 return snprintf(buf
, PAGE_SIZE
, ro_flag
? "1\n" : "0\n");
658 dasd_ro_store(struct device
*dev
, struct device_attribute
*attr
,
659 const char *buf
, size_t count
)
661 struct dasd_devmap
*devmap
;
664 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
666 return PTR_ERR(devmap
);
667 ro_flag
= buf
[0] == '1';
668 spin_lock(&dasd_devmap_lock
);
670 devmap
->features
|= DASD_FEATURE_READONLY
;
672 devmap
->features
&= ~DASD_FEATURE_READONLY
;
674 devmap
->device
->features
= devmap
->features
;
675 if (devmap
->device
&& devmap
->device
->gdp
)
676 set_disk_ro(devmap
->device
->gdp
, ro_flag
);
677 spin_unlock(&dasd_devmap_lock
);
681 static DEVICE_ATTR(readonly
, 0644, dasd_ro_show
, dasd_ro_store
);
684 * use_diag controls whether the driver should use diag rather than ssch
685 * to talk to the device
688 dasd_use_diag_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
690 struct dasd_devmap
*devmap
;
693 devmap
= dasd_find_busid(dev
->bus_id
);
695 use_diag
= (devmap
->features
& DASD_FEATURE_USEDIAG
) != 0;
697 use_diag
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_USEDIAG
) != 0;
698 return sprintf(buf
, use_diag
? "1\n" : "0\n");
702 dasd_use_diag_store(struct device
*dev
, struct device_attribute
*attr
,
703 const char *buf
, size_t count
)
705 struct dasd_devmap
*devmap
;
709 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
711 return PTR_ERR(devmap
);
712 use_diag
= buf
[0] == '1';
713 spin_lock(&dasd_devmap_lock
);
714 /* Changing diag discipline flag is only allowed in offline state. */
716 if (!devmap
->device
) {
718 devmap
->features
|= DASD_FEATURE_USEDIAG
;
720 devmap
->features
&= ~DASD_FEATURE_USEDIAG
;
723 spin_unlock(&dasd_devmap_lock
);
727 static DEVICE_ATTR(use_diag
, 0644, dasd_use_diag_show
, dasd_use_diag_store
);
730 dasd_discipline_show(struct device
*dev
, struct device_attribute
*attr
,
733 struct dasd_devmap
*devmap
;
736 spin_lock(&dasd_devmap_lock
);
738 devmap
= dev
->driver_data
;
739 if (devmap
&& devmap
->device
&& devmap
->device
->discipline
)
740 dname
= devmap
->device
->discipline
->name
;
741 spin_unlock(&dasd_devmap_lock
);
742 return snprintf(buf
, PAGE_SIZE
, "%s\n", dname
);
745 static DEVICE_ATTR(discipline
, 0444, dasd_discipline_show
, NULL
);
748 dasd_alias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
750 struct dasd_devmap
*devmap
;
753 devmap
= dasd_find_busid(dev
->bus_id
);
754 spin_lock(&dasd_devmap_lock
);
756 alias
= devmap
->uid
.alias
;
759 spin_unlock(&dasd_devmap_lock
);
761 return sprintf(buf
, alias
? "1\n" : "0\n");
764 static DEVICE_ATTR(alias
, 0444, dasd_alias_show
, NULL
);
767 dasd_vendor_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
769 struct dasd_devmap
*devmap
;
772 devmap
= dasd_find_busid(dev
->bus_id
);
773 spin_lock(&dasd_devmap_lock
);
774 if (!IS_ERR(devmap
) && strlen(devmap
->uid
.vendor
) > 0)
775 vendor
= devmap
->uid
.vendor
;
778 spin_unlock(&dasd_devmap_lock
);
780 return snprintf(buf
, PAGE_SIZE
, "%s\n", vendor
);
783 static DEVICE_ATTR(vendor
, 0444, dasd_vendor_show
, NULL
);
785 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
786 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1)
789 dasd_uid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
791 struct dasd_devmap
*devmap
;
792 char uid
[UID_STRLEN
];
794 devmap
= dasd_find_busid(dev
->bus_id
);
795 spin_lock(&dasd_devmap_lock
);
796 if (!IS_ERR(devmap
) && strlen(devmap
->uid
.vendor
) > 0)
797 snprintf(uid
, sizeof(uid
), "%s.%s.%04x.%02x",
798 devmap
->uid
.vendor
, devmap
->uid
.serial
,
799 devmap
->uid
.ssid
, devmap
->uid
.unit_addr
);
802 spin_unlock(&dasd_devmap_lock
);
804 return snprintf(buf
, PAGE_SIZE
, "%s\n", uid
);
807 static DEVICE_ATTR(uid
, 0444, dasd_uid_show
, NULL
);
810 * extended error-reporting
813 dasd_eer_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
815 struct dasd_devmap
*devmap
;
818 devmap
= dasd_find_busid(dev
->bus_id
);
819 if (!IS_ERR(devmap
) && devmap
->device
)
820 eer_flag
= dasd_eer_enabled(devmap
->device
);
823 return snprintf(buf
, PAGE_SIZE
, eer_flag
? "1\n" : "0\n");
827 dasd_eer_store(struct device
*dev
, struct device_attribute
*attr
,
828 const char *buf
, size_t count
)
830 struct dasd_devmap
*devmap
;
833 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
835 return PTR_ERR(devmap
);
839 rc
= dasd_eer_enable(devmap
->device
);
843 dasd_eer_disable(devmap
->device
);
847 static DEVICE_ATTR(eer_enabled
, 0644, dasd_eer_show
, dasd_eer_store
);
849 static struct attribute
* dasd_attrs
[] = {
850 &dev_attr_readonly
.attr
,
851 &dev_attr_discipline
.attr
,
852 &dev_attr_alias
.attr
,
853 &dev_attr_vendor
.attr
,
855 &dev_attr_use_diag
.attr
,
856 &dev_attr_eer_enabled
.attr
,
860 static struct attribute_group dasd_attr_group
= {
865 * Return copy of the device unique identifier.
868 dasd_get_uid(struct ccw_device
*cdev
, struct dasd_uid
*uid
)
870 struct dasd_devmap
*devmap
;
872 devmap
= dasd_find_busid(cdev
->dev
.bus_id
);
874 return PTR_ERR(devmap
);
875 spin_lock(&dasd_devmap_lock
);
877 spin_unlock(&dasd_devmap_lock
);
882 * Register the given device unique identifier into devmap struct.
883 * In addition check if the related storage server subsystem ID is already
884 * contained in the dasd_server_ssid_list. If subsystem ID is not contained,
886 * Return 0 if server was already in serverlist,
887 * 1 if the server was added successful
888 * <0 in case of error.
891 dasd_set_uid(struct ccw_device
*cdev
, struct dasd_uid
*uid
)
893 struct dasd_devmap
*devmap
;
894 struct dasd_server_ssid_map
*srv
, *tmp
;
896 devmap
= dasd_find_busid(cdev
->dev
.bus_id
);
898 return PTR_ERR(devmap
);
900 /* generate entry for server_ssid_map */
901 srv
= (struct dasd_server_ssid_map
*)
902 kzalloc(sizeof(struct dasd_server_ssid_map
), GFP_KERNEL
);
905 strncpy(srv
->sid
.vendor
, uid
->vendor
, sizeof(srv
->sid
.vendor
) - 1);
906 strncpy(srv
->sid
.serial
, uid
->serial
, sizeof(srv
->sid
.serial
) - 1);
907 srv
->ssid
= uid
->ssid
;
909 /* server is already contained ? */
910 spin_lock(&dasd_devmap_lock
);
912 list_for_each_entry(tmp
, &dasd_server_ssid_list
, list
) {
913 if (!memcmp(&srv
->sid
, &tmp
->sid
,
914 sizeof(struct dasd_server_ssid_map
))) {
921 /* add servermap to serverlist */
923 list_add(&srv
->list
, &dasd_server_ssid_list
);
924 spin_unlock(&dasd_devmap_lock
);
926 return (srv
? 1 : 0);
928 EXPORT_SYMBOL_GPL(dasd_set_uid
);
931 * Return value of the specified feature.
934 dasd_get_feature(struct ccw_device
*cdev
, int feature
)
936 struct dasd_devmap
*devmap
;
938 devmap
= dasd_find_busid(cdev
->dev
.bus_id
);
940 return PTR_ERR(devmap
);
942 return ((devmap
->features
& feature
) != 0);
946 * Set / reset given feature.
947 * Flag indicates wether to set (!=0) or the reset (=0) the feature.
950 dasd_set_feature(struct ccw_device
*cdev
, int feature
, int flag
)
952 struct dasd_devmap
*devmap
;
954 devmap
= dasd_find_busid(cdev
->dev
.bus_id
);
956 return PTR_ERR(devmap
);
958 spin_lock(&dasd_devmap_lock
);
960 devmap
->features
|= feature
;
962 devmap
->features
&= ~feature
;
964 devmap
->device
->features
= devmap
->features
;
965 spin_unlock(&dasd_devmap_lock
);
971 dasd_add_sysfs_files(struct ccw_device
*cdev
)
973 return sysfs_create_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
977 dasd_remove_sysfs_files(struct ccw_device
*cdev
)
979 sysfs_remove_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
984 dasd_devmap_init(void)
988 /* Initialize devmap structures. */
989 dasd_max_devindex
= 0;
990 for (i
= 0; i
< 256; i
++)
991 INIT_LIST_HEAD(&dasd_hashlists
[i
]);
993 /* Initialize servermap structure. */
994 INIT_LIST_HEAD(&dasd_server_ssid_list
);
999 dasd_devmap_exit(void)
1001 dasd_forget_ranges();