2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999,2001
9 * Device mapping and dasd= parameter parsing functions. All devmap
10 * functions may not be called from interrupt context. In particular
11 * dasd_get_device is a no-no from interrupt context.
15 #define KMSG_COMPONENT "dasd"
17 #include <linux/ctype.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
22 #include <asm/debug.h>
23 #include <linux/uaccess.h>
27 #define PRINTK_HEADER "dasd_devmap:"
28 #define DASD_BUS_ID_SIZE 20
29 #define DASD_MAX_PARAMS 256
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
[DASD_MAX_PARAMS
];
81 module_param_array(dasd
, charp
, NULL
, S_IRUGO
);
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
++)
108 static int __init
dasd_call_setup(char *opt
)
110 static int i __initdata
;
113 while (i
< DASD_MAX_PARAMS
) {
114 tmp
= strsep(&opt
, ",");
124 __setup ("dasd=", dasd_call_setup
);
125 #endif /* #ifndef MODULE */
127 #define DASD_IPLDEV "ipldev"
130 * Read a device busid/devno from a string.
132 static int __init
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
;
150 /* Old style 0xXXXX or XXXX */
151 if (!kstrtouint(str
, 16, &val
)) {
159 /* New style x.y.z busid */
160 tok
= strsep(&str
, ".");
161 if (kstrtouint(tok
, 16, &val
) || val
> 0xff)
165 tok
= strsep(&str
, ".");
166 if (kstrtouint(tok
, 16, &val
) || val
> 0xff)
170 tok
= strsep(&str
, ".");
171 if (kstrtouint(tok
, 16, &val
) || val
> 0xffff)
179 * Read colon separated list of dasd features.
181 static int __init
dasd_feature_list(char *str
)
183 int features
, len
, rc
;
189 return DASD_FEATURE_DEFAULT
;
193 str
[len
] && str
[len
] != ':' && str
[len
] != ')'; len
++);
194 if (len
== 2 && !strncmp(str
, "ro", 2))
195 features
|= DASD_FEATURE_READONLY
;
196 else if (len
== 4 && !strncmp(str
, "diag", 4))
197 features
|= DASD_FEATURE_USEDIAG
;
198 else if (len
== 3 && !strncmp(str
, "raw", 3))
199 features
|= DASD_FEATURE_USERAW
;
200 else if (len
== 6 && !strncmp(str
, "erplog", 6))
201 features
|= DASD_FEATURE_ERPLOG
;
202 else if (len
== 8 && !strncmp(str
, "failfast", 8))
203 features
|= DASD_FEATURE_FAILFAST
;
205 pr_warn("%*s is not a supported device option\n",
215 return rc
? : features
;
219 * Try to match the first element on the comma separated parse string
220 * with one of the known keywords. If a keyword is found, take the approprate
221 * action and return a pointer to the residual string. If the first element
222 * could not be matched to any keyword then return an error code.
224 static int __init
dasd_parse_keyword(char *keyword
)
226 int length
= strlen(keyword
);
228 if (strncmp("autodetect", keyword
, length
) == 0) {
230 pr_info("The autodetection mode has been activated\n");
233 if (strncmp("probeonly", keyword
, length
) == 0) {
235 pr_info("The probeonly mode has been activated\n");
238 if (strncmp("nopav", keyword
, length
) == 0) {
240 pr_info("'nopav' is not supported on z/VM\n");
243 pr_info("PAV support has be deactivated\n");
247 if (strncmp("nofcx", keyword
, length
) == 0) {
249 pr_info("High Performance FICON support has been "
253 if (strncmp("fixedbuffers", keyword
, length
) == 0) {
257 kmem_cache_create("dasd_page_cache", PAGE_SIZE
,
258 PAGE_SIZE
, SLAB_CACHE_DMA
,
260 if (!dasd_page_cache
)
261 DBF_EVENT(DBF_WARNING
, "%s", "Failed to create slab, "
262 "fixed buffer mode disabled.");
264 DBF_EVENT(DBF_INFO
, "%s",
265 "turning on fixed buffer mode");
273 * Split a string of a device range into its pieces and return the from, to, and
274 * feature parts separately.
276 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
277 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
278 * 0x4321 -> from: 0x4321 to: null features: null
280 static int __init
dasd_evaluate_range_param(char *range
, char **from_str
,
281 char **to_str
, char **features_str
)
285 /* Do we have a range or a single device? */
286 if (strchr(range
, '-')) {
287 *from_str
= strsep(&range
, "-");
288 *to_str
= strsep(&range
, "(");
289 *features_str
= strsep(&range
, ")");
291 *from_str
= strsep(&range
, "(");
292 *features_str
= strsep(&range
, ")");
295 if (*features_str
&& !range
) {
296 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
304 * Try to interprete the range string as a device number or a range of devices.
305 * If the interpretation is successful, create the matching dasd_devmap entries.
306 * If interpretation fails or in case of an error, return an error code.
308 static int __init
dasd_parse_range(const char *range
)
310 struct dasd_devmap
*devmap
;
311 int from
, from_id0
, from_id1
;
312 int to
, to_id0
, to_id1
;
314 char bus_id
[DASD_BUS_ID_SIZE
+ 1];
315 char *features_str
= NULL
;
316 char *from_str
= NULL
;
321 tmp
= kstrdup(range
, GFP_KERNEL
);
325 if (dasd_evaluate_range_param(tmp
, &from_str
, &to_str
, &features_str
)) {
330 if (dasd_busid(from_str
, &from_id0
, &from_id1
, &from
)) {
339 if (dasd_busid(to_str
, &to_id0
, &to_id1
, &to
)) {
343 if (from_id0
!= to_id0
|| from_id1
!= to_id1
|| from
> to
) {
344 pr_err("%s is not a valid device range\n", range
);
350 features
= dasd_feature_list(features_str
);
355 /* each device in dasd= parameter should be set initially online */
356 features
|= DASD_FEATURE_INITIAL_ONLINE
;
358 sprintf(bus_id
, "%01x.%01x.%04x", from_id0
, from_id1
, from
++);
359 devmap
= dasd_add_busid(bus_id
, features
);
360 if (IS_ERR(devmap
)) {
361 rc
= PTR_ERR(devmap
);
373 * Parse parameters stored in dasd[]
374 * The 'dasd=...' parameter allows to specify a comma separated list of
375 * keywords and device ranges. The parameters in that list will be stored as
376 * separate elementes in dasd[].
378 int __init
dasd_parse(void)
384 for (i
= 0; i
< DASD_MAX_PARAMS
; i
++) {
391 rc
= dasd_parse_keyword(cur
);
393 rc
= dasd_parse_range(cur
);
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 = kzalloc(sizeof(struct dasd_devmap
), GFP_KERNEL
);
416 return ERR_PTR(-ENOMEM
);
417 spin_lock(&dasd_devmap_lock
);
419 hash
= dasd_hash_busid(bus_id
);
420 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
)
421 if (strncmp(tmp
->bus_id
, bus_id
, DASD_BUS_ID_SIZE
) == 0) {
426 /* This bus_id is new. */
427 new->devindex
= dasd_max_devindex
++;
428 strncpy(new->bus_id
, bus_id
, DASD_BUS_ID_SIZE
);
429 new->features
= features
;
431 list_add(&new->list
, &dasd_hashlists
[hash
]);
435 spin_unlock(&dasd_devmap_lock
);
441 * Find devmap for device with given bus_id.
443 static struct dasd_devmap
*
444 dasd_find_busid(const char *bus_id
)
446 struct dasd_devmap
*devmap
, *tmp
;
449 spin_lock(&dasd_devmap_lock
);
450 devmap
= ERR_PTR(-ENODEV
);
451 hash
= dasd_hash_busid(bus_id
);
452 list_for_each_entry(tmp
, &dasd_hashlists
[hash
], list
) {
453 if (strncmp(tmp
->bus_id
, bus_id
, DASD_BUS_ID_SIZE
) == 0) {
458 spin_unlock(&dasd_devmap_lock
);
463 * Check if busid has been added to the list of dasd ranges.
466 dasd_busid_known(const char *bus_id
)
468 return IS_ERR(dasd_find_busid(bus_id
)) ? -ENOENT
: 0;
472 * Forget all about the device numbers added so far.
473 * This may only be called at module unload or system shutdown.
476 dasd_forget_ranges(void)
478 struct dasd_devmap
*devmap
, *n
;
481 spin_lock(&dasd_devmap_lock
);
482 for (i
= 0; i
< 256; i
++) {
483 list_for_each_entry_safe(devmap
, n
, &dasd_hashlists
[i
], list
) {
484 BUG_ON(devmap
->device
!= NULL
);
485 list_del(&devmap
->list
);
489 spin_unlock(&dasd_devmap_lock
);
493 * Find the device struct by its device index.
496 dasd_device_from_devindex(int devindex
)
498 struct dasd_devmap
*devmap
, *tmp
;
499 struct dasd_device
*device
;
502 spin_lock(&dasd_devmap_lock
);
504 for (i
= 0; (i
< 256) && !devmap
; i
++)
505 list_for_each_entry(tmp
, &dasd_hashlists
[i
], list
)
506 if (tmp
->devindex
== devindex
) {
507 /* Found the devmap for the device. */
511 if (devmap
&& devmap
->device
) {
512 device
= devmap
->device
;
513 dasd_get_device(device
);
515 device
= ERR_PTR(-ENODEV
);
516 spin_unlock(&dasd_devmap_lock
);
521 * Return devmap for cdev. If no devmap exists yet, create one and
522 * connect it to the cdev.
524 static struct dasd_devmap
*
525 dasd_devmap_from_cdev(struct ccw_device
*cdev
)
527 struct dasd_devmap
*devmap
;
529 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
531 devmap
= dasd_add_busid(dev_name(&cdev
->dev
),
532 DASD_FEATURE_DEFAULT
);
537 * Create a dasd device structure for cdev.
540 dasd_create_device(struct ccw_device
*cdev
)
542 struct dasd_devmap
*devmap
;
543 struct dasd_device
*device
;
547 devmap
= dasd_devmap_from_cdev(cdev
);
549 return (void *) devmap
;
551 device
= dasd_alloc_device();
554 atomic_set(&device
->ref_count
, 3);
556 spin_lock(&dasd_devmap_lock
);
557 if (!devmap
->device
) {
558 devmap
->device
= device
;
559 device
->devindex
= devmap
->devindex
;
560 device
->features
= devmap
->features
;
561 get_device(&cdev
->dev
);
565 /* Someone else was faster. */
567 spin_unlock(&dasd_devmap_lock
);
570 dasd_free_device(device
);
574 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
575 dev_set_drvdata(&cdev
->dev
, device
);
576 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
582 * Wait queue for dasd_delete_device waits.
584 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq
);
587 * Remove a dasd device structure. The passed referenced
591 dasd_delete_device(struct dasd_device
*device
)
593 struct ccw_device
*cdev
;
594 struct dasd_devmap
*devmap
;
597 /* First remove device pointer from devmap. */
598 devmap
= dasd_find_busid(dev_name(&device
->cdev
->dev
));
599 BUG_ON(IS_ERR(devmap
));
600 spin_lock(&dasd_devmap_lock
);
601 if (devmap
->device
!= device
) {
602 spin_unlock(&dasd_devmap_lock
);
603 dasd_put_device(device
);
606 devmap
->device
= NULL
;
607 spin_unlock(&dasd_devmap_lock
);
609 /* Disconnect dasd_device structure from ccw_device structure. */
610 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
611 dev_set_drvdata(&device
->cdev
->dev
, NULL
);
612 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
615 * Drop ref_count by 3, one for the devmap reference, one for
616 * the cdev reference and one for the passed reference.
618 atomic_sub(3, &device
->ref_count
);
620 /* Wait for reference counter to drop to zero. */
621 wait_event(dasd_delete_wq
, atomic_read(&device
->ref_count
) == 0);
623 dasd_generic_free_discipline(device
);
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
)
734 if (kstrtouint(buf
, 0, &val
) || val
> 1)
737 rc
= dasd_set_feature(to_ccwdev(dev
), DASD_FEATURE_FAILFAST
, val
);
742 static DEVICE_ATTR(failfast
, 0644, dasd_ff_show
, dasd_ff_store
);
745 * readonly controls the readonly status of a dasd
748 dasd_ro_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
750 struct dasd_devmap
*devmap
;
751 struct dasd_device
*device
;
754 devmap
= dasd_find_busid(dev_name(dev
));
758 ro_flag
= !!(devmap
->features
& DASD_FEATURE_READONLY
);
760 spin_lock(&dasd_devmap_lock
);
761 device
= devmap
->device
;
763 ro_flag
|= test_bit(DASD_FLAG_DEVICE_RO
, &device
->flags
);
764 spin_unlock(&dasd_devmap_lock
);
767 return snprintf(buf
, PAGE_SIZE
, ro_flag
? "1\n" : "0\n");
771 dasd_ro_store(struct device
*dev
, struct device_attribute
*attr
,
772 const char *buf
, size_t count
)
774 struct ccw_device
*cdev
= to_ccwdev(dev
);
775 struct dasd_device
*device
;
780 if (kstrtouint(buf
, 0, &val
) || val
> 1)
783 rc
= dasd_set_feature(cdev
, DASD_FEATURE_READONLY
, val
);
787 device
= dasd_device_from_cdev(cdev
);
791 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
792 val
= val
|| test_bit(DASD_FLAG_DEVICE_RO
, &device
->flags
);
794 if (!device
->block
|| !device
->block
->gdp
||
795 test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
796 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
799 /* Increase open_count to avoid losing the block device */
800 atomic_inc(&device
->block
->open_count
);
801 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
803 set_disk_ro(device
->block
->gdp
, val
);
804 atomic_dec(&device
->block
->open_count
);
807 dasd_put_device(device
);
812 static DEVICE_ATTR(readonly
, 0644, dasd_ro_show
, dasd_ro_store
);
814 * erplog controls the logging of ERP related data
815 * (e.g. failing channel programs).
818 dasd_erplog_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
820 struct dasd_devmap
*devmap
;
823 devmap
= dasd_find_busid(dev_name(dev
));
825 erplog
= (devmap
->features
& DASD_FEATURE_ERPLOG
) != 0;
827 erplog
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_ERPLOG
) != 0;
828 return snprintf(buf
, PAGE_SIZE
, erplog
? "1\n" : "0\n");
832 dasd_erplog_store(struct device
*dev
, struct device_attribute
*attr
,
833 const char *buf
, size_t count
)
838 if (kstrtouint(buf
, 0, &val
) || val
> 1)
841 rc
= dasd_set_feature(to_ccwdev(dev
), DASD_FEATURE_ERPLOG
, val
);
846 static DEVICE_ATTR(erplog
, 0644, dasd_erplog_show
, dasd_erplog_store
);
849 * use_diag controls whether the driver should use diag rather than ssch
850 * to talk to the device
853 dasd_use_diag_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
855 struct dasd_devmap
*devmap
;
858 devmap
= dasd_find_busid(dev_name(dev
));
860 use_diag
= (devmap
->features
& DASD_FEATURE_USEDIAG
) != 0;
862 use_diag
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_USEDIAG
) != 0;
863 return sprintf(buf
, use_diag
? "1\n" : "0\n");
867 dasd_use_diag_store(struct device
*dev
, struct device_attribute
*attr
,
868 const char *buf
, size_t count
)
870 struct dasd_devmap
*devmap
;
874 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
876 return PTR_ERR(devmap
);
878 if (kstrtouint(buf
, 0, &val
) || val
> 1)
881 spin_lock(&dasd_devmap_lock
);
882 /* Changing diag discipline flag is only allowed in offline state. */
884 if (!devmap
->device
&& !(devmap
->features
& DASD_FEATURE_USERAW
)) {
886 devmap
->features
|= DASD_FEATURE_USEDIAG
;
888 devmap
->features
&= ~DASD_FEATURE_USEDIAG
;
891 spin_unlock(&dasd_devmap_lock
);
895 static DEVICE_ATTR(use_diag
, 0644, dasd_use_diag_show
, dasd_use_diag_store
);
898 * use_raw controls whether the driver should give access to raw eckd data or
899 * operate in standard mode
902 dasd_use_raw_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
904 struct dasd_devmap
*devmap
;
907 devmap
= dasd_find_busid(dev_name(dev
));
909 use_raw
= (devmap
->features
& DASD_FEATURE_USERAW
) != 0;
911 use_raw
= (DASD_FEATURE_DEFAULT
& DASD_FEATURE_USERAW
) != 0;
912 return sprintf(buf
, use_raw
? "1\n" : "0\n");
916 dasd_use_raw_store(struct device
*dev
, struct device_attribute
*attr
,
917 const char *buf
, size_t count
)
919 struct dasd_devmap
*devmap
;
923 devmap
= dasd_devmap_from_cdev(to_ccwdev(dev
));
925 return PTR_ERR(devmap
);
927 if ((kstrtoul(buf
, 10, &val
) != 0) || val
> 1)
930 spin_lock(&dasd_devmap_lock
);
931 /* Changing diag discipline flag is only allowed in offline state. */
933 if (!devmap
->device
&& !(devmap
->features
& DASD_FEATURE_USEDIAG
)) {
935 devmap
->features
|= DASD_FEATURE_USERAW
;
937 devmap
->features
&= ~DASD_FEATURE_USERAW
;
940 spin_unlock(&dasd_devmap_lock
);
944 static DEVICE_ATTR(raw_track_access
, 0644, dasd_use_raw_show
,
948 dasd_safe_offline_store(struct device
*dev
, struct device_attribute
*attr
,
949 const char *buf
, size_t count
)
951 struct ccw_device
*cdev
= to_ccwdev(dev
);
952 struct dasd_device
*device
;
956 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
957 device
= dasd_device_from_cdev_locked(cdev
);
958 if (IS_ERR(device
)) {
959 rc
= PTR_ERR(device
);
960 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
964 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) ||
965 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
966 /* Already doing offline processing */
967 dasd_put_device(device
);
968 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
973 set_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
);
974 dasd_put_device(device
);
975 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
977 rc
= ccw_device_set_offline(cdev
);
980 return rc
? rc
: count
;
983 static DEVICE_ATTR(safe_offline
, 0200, NULL
, dasd_safe_offline_store
);
986 dasd_access_show(struct device
*dev
, struct device_attribute
*attr
,
989 struct ccw_device
*cdev
= to_ccwdev(dev
);
990 struct dasd_device
*device
;
993 device
= dasd_device_from_cdev(cdev
);
995 return PTR_ERR(device
);
997 if (!device
->discipline
)
999 else if (!device
->discipline
->host_access_count
)
1000 count
= -EOPNOTSUPP
;
1002 count
= device
->discipline
->host_access_count(device
);
1004 dasd_put_device(device
);
1008 return sprintf(buf
, "%d\n", count
);
1011 static DEVICE_ATTR(host_access_count
, 0444, dasd_access_show
, NULL
);
1014 dasd_discipline_show(struct device
*dev
, struct device_attribute
*attr
,
1017 struct dasd_device
*device
;
1020 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1023 else if (!device
->discipline
) {
1024 dasd_put_device(device
);
1027 len
= snprintf(buf
, PAGE_SIZE
, "%s\n",
1028 device
->discipline
->name
);
1029 dasd_put_device(device
);
1033 len
= snprintf(buf
, PAGE_SIZE
, "none\n");
1037 static DEVICE_ATTR(discipline
, 0444, dasd_discipline_show
, NULL
);
1040 dasd_device_status_show(struct device
*dev
, struct device_attribute
*attr
,
1043 struct dasd_device
*device
;
1046 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1047 if (!IS_ERR(device
)) {
1048 switch (device
->state
) {
1049 case DASD_STATE_NEW
:
1050 len
= snprintf(buf
, PAGE_SIZE
, "new\n");
1052 case DASD_STATE_KNOWN
:
1053 len
= snprintf(buf
, PAGE_SIZE
, "detected\n");
1055 case DASD_STATE_BASIC
:
1056 len
= snprintf(buf
, PAGE_SIZE
, "basic\n");
1058 case DASD_STATE_UNFMT
:
1059 len
= snprintf(buf
, PAGE_SIZE
, "unformatted\n");
1061 case DASD_STATE_READY
:
1062 len
= snprintf(buf
, PAGE_SIZE
, "ready\n");
1064 case DASD_STATE_ONLINE
:
1065 len
= snprintf(buf
, PAGE_SIZE
, "online\n");
1068 len
= snprintf(buf
, PAGE_SIZE
, "no stat\n");
1071 dasd_put_device(device
);
1073 len
= snprintf(buf
, PAGE_SIZE
, "unknown\n");
1077 static DEVICE_ATTR(status
, 0444, dasd_device_status_show
, NULL
);
1079 static ssize_t
dasd_alias_show(struct device
*dev
,
1080 struct device_attribute
*attr
, char *buf
)
1082 struct dasd_device
*device
;
1083 struct dasd_uid uid
;
1085 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1087 return sprintf(buf
, "0\n");
1089 if (device
->discipline
&& device
->discipline
->get_uid
&&
1090 !device
->discipline
->get_uid(device
, &uid
)) {
1091 if (uid
.type
== UA_BASE_PAV_ALIAS
||
1092 uid
.type
== UA_HYPER_PAV_ALIAS
) {
1093 dasd_put_device(device
);
1094 return sprintf(buf
, "1\n");
1097 dasd_put_device(device
);
1099 return sprintf(buf
, "0\n");
1102 static DEVICE_ATTR(alias
, 0444, dasd_alias_show
, NULL
);
1104 static ssize_t
dasd_vendor_show(struct device
*dev
,
1105 struct device_attribute
*attr
, char *buf
)
1107 struct dasd_device
*device
;
1108 struct dasd_uid uid
;
1111 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1114 return snprintf(buf
, PAGE_SIZE
, "%s\n", vendor
);
1116 if (device
->discipline
&& device
->discipline
->get_uid
&&
1117 !device
->discipline
->get_uid(device
, &uid
))
1118 vendor
= uid
.vendor
;
1120 dasd_put_device(device
);
1122 return snprintf(buf
, PAGE_SIZE
, "%s\n", vendor
);
1125 static DEVICE_ATTR(vendor
, 0444, dasd_vendor_show
, NULL
);
1127 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1128 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1132 dasd_uid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1134 struct dasd_device
*device
;
1135 struct dasd_uid uid
;
1136 char uid_string
[UID_STRLEN
];
1139 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1142 return snprintf(buf
, PAGE_SIZE
, "%s\n", uid_string
);
1144 if (device
->discipline
&& device
->discipline
->get_uid
&&
1145 !device
->discipline
->get_uid(device
, &uid
)) {
1147 case UA_BASE_DEVICE
:
1148 snprintf(ua_string
, sizeof(ua_string
), "%02x",
1149 uid
.real_unit_addr
);
1151 case UA_BASE_PAV_ALIAS
:
1152 snprintf(ua_string
, sizeof(ua_string
), "%02x",
1153 uid
.base_unit_addr
);
1155 case UA_HYPER_PAV_ALIAS
:
1156 snprintf(ua_string
, sizeof(ua_string
), "xx");
1159 /* should not happen, treat like base device */
1160 snprintf(ua_string
, sizeof(ua_string
), "%02x",
1161 uid
.real_unit_addr
);
1165 if (strlen(uid
.vduit
) > 0)
1166 snprintf(uid_string
, sizeof(uid_string
),
1168 uid
.vendor
, uid
.serial
, uid
.ssid
, ua_string
,
1171 snprintf(uid_string
, sizeof(uid_string
),
1173 uid
.vendor
, uid
.serial
, uid
.ssid
, ua_string
);
1175 dasd_put_device(device
);
1177 return snprintf(buf
, PAGE_SIZE
, "%s\n", uid_string
);
1179 static DEVICE_ATTR(uid
, 0444, dasd_uid_show
, NULL
);
1182 * extended error-reporting
1185 dasd_eer_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1187 struct dasd_devmap
*devmap
;
1190 devmap
= dasd_find_busid(dev_name(dev
));
1191 if (!IS_ERR(devmap
) && devmap
->device
)
1192 eer_flag
= dasd_eer_enabled(devmap
->device
);
1195 return snprintf(buf
, PAGE_SIZE
, eer_flag
? "1\n" : "0\n");
1199 dasd_eer_store(struct device
*dev
, struct device_attribute
*attr
,
1200 const char *buf
, size_t count
)
1202 struct dasd_device
*device
;
1206 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1208 return PTR_ERR(device
);
1210 if (kstrtouint(buf
, 0, &val
) || val
> 1)
1214 rc
= dasd_eer_enable(device
);
1216 dasd_eer_disable(device
);
1218 dasd_put_device(device
);
1220 return rc
? : count
;
1223 static DEVICE_ATTR(eer_enabled
, 0644, dasd_eer_show
, dasd_eer_store
);
1226 * expiration time for default requests
1229 dasd_expires_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1231 struct dasd_device
*device
;
1234 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1237 len
= snprintf(buf
, PAGE_SIZE
, "%lu\n", device
->default_expires
);
1238 dasd_put_device(device
);
1243 dasd_expires_store(struct device
*dev
, struct device_attribute
*attr
,
1244 const char *buf
, size_t count
)
1246 struct dasd_device
*device
;
1249 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1253 if ((kstrtoul(buf
, 10, &val
) != 0) ||
1254 (val
> DASD_EXPIRES_MAX
) || val
== 0) {
1255 dasd_put_device(device
);
1260 device
->default_expires
= val
;
1262 dasd_put_device(device
);
1266 static DEVICE_ATTR(expires
, 0644, dasd_expires_show
, dasd_expires_store
);
1269 dasd_retries_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1271 struct dasd_device
*device
;
1274 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1277 len
= snprintf(buf
, PAGE_SIZE
, "%lu\n", device
->default_retries
);
1278 dasd_put_device(device
);
1283 dasd_retries_store(struct device
*dev
, struct device_attribute
*attr
,
1284 const char *buf
, size_t count
)
1286 struct dasd_device
*device
;
1289 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1293 if ((kstrtoul(buf
, 10, &val
) != 0) ||
1294 (val
> DASD_RETRIES_MAX
)) {
1295 dasd_put_device(device
);
1300 device
->default_retries
= val
;
1302 dasd_put_device(device
);
1306 static DEVICE_ATTR(retries
, 0644, dasd_retries_show
, dasd_retries_store
);
1309 dasd_timeout_show(struct device
*dev
, struct device_attribute
*attr
,
1312 struct dasd_device
*device
;
1315 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1318 len
= snprintf(buf
, PAGE_SIZE
, "%lu\n", device
->blk_timeout
);
1319 dasd_put_device(device
);
1324 dasd_timeout_store(struct device
*dev
, struct device_attribute
*attr
,
1325 const char *buf
, size_t count
)
1327 struct dasd_device
*device
;
1328 struct request_queue
*q
;
1331 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1332 if (IS_ERR(device
) || !device
->block
)
1335 if ((kstrtoul(buf
, 10, &val
) != 0) ||
1336 val
> UINT_MAX
/ HZ
) {
1337 dasd_put_device(device
);
1340 q
= device
->block
->request_queue
;
1342 dasd_put_device(device
);
1346 device
->blk_timeout
= val
;
1348 blk_queue_rq_timeout(q
, device
->blk_timeout
* HZ
);
1350 dasd_put_device(device
);
1354 static DEVICE_ATTR(timeout
, 0644,
1355 dasd_timeout_show
, dasd_timeout_store
);
1359 dasd_path_reset_store(struct device
*dev
, struct device_attribute
*attr
,
1360 const char *buf
, size_t count
)
1362 struct dasd_device
*device
;
1365 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1369 if ((kstrtouint(buf
, 16, &val
) != 0) || val
> 0xff)
1372 if (device
->discipline
&& device
->discipline
->reset_path
)
1373 device
->discipline
->reset_path(device
, (__u8
) val
);
1375 dasd_put_device(device
);
1379 static DEVICE_ATTR(path_reset
, 0200, NULL
, dasd_path_reset_store
);
1381 static ssize_t
dasd_hpf_show(struct device
*dev
, struct device_attribute
*attr
,
1384 struct dasd_device
*device
;
1387 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1390 if (!device
->discipline
|| !device
->discipline
->hpf_enabled
) {
1391 dasd_put_device(device
);
1392 return snprintf(buf
, PAGE_SIZE
, "%d\n", dasd_nofcx
);
1394 hpf
= device
->discipline
->hpf_enabled(device
);
1395 dasd_put_device(device
);
1396 return snprintf(buf
, PAGE_SIZE
, "%d\n", hpf
);
1399 static DEVICE_ATTR(hpf
, 0444, dasd_hpf_show
, NULL
);
1401 static ssize_t
dasd_reservation_policy_show(struct device
*dev
,
1402 struct device_attribute
*attr
,
1405 struct dasd_devmap
*devmap
;
1408 devmap
= dasd_find_busid(dev_name(dev
));
1409 if (IS_ERR(devmap
)) {
1410 rc
= snprintf(buf
, PAGE_SIZE
, "ignore\n");
1412 spin_lock(&dasd_devmap_lock
);
1413 if (devmap
->features
& DASD_FEATURE_FAILONSLCK
)
1414 rc
= snprintf(buf
, PAGE_SIZE
, "fail\n");
1416 rc
= snprintf(buf
, PAGE_SIZE
, "ignore\n");
1417 spin_unlock(&dasd_devmap_lock
);
1422 static ssize_t
dasd_reservation_policy_store(struct device
*dev
,
1423 struct device_attribute
*attr
,
1424 const char *buf
, size_t count
)
1426 struct ccw_device
*cdev
= to_ccwdev(dev
);
1429 if (sysfs_streq("ignore", buf
))
1430 rc
= dasd_set_feature(cdev
, DASD_FEATURE_FAILONSLCK
, 0);
1431 else if (sysfs_streq("fail", buf
))
1432 rc
= dasd_set_feature(cdev
, DASD_FEATURE_FAILONSLCK
, 1);
1436 return rc
? : count
;
1439 static DEVICE_ATTR(reservation_policy
, 0644,
1440 dasd_reservation_policy_show
, dasd_reservation_policy_store
);
1442 static ssize_t
dasd_reservation_state_show(struct device
*dev
,
1443 struct device_attribute
*attr
,
1446 struct dasd_device
*device
;
1449 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1451 return snprintf(buf
, PAGE_SIZE
, "none\n");
1453 if (test_bit(DASD_FLAG_IS_RESERVED
, &device
->flags
))
1454 rc
= snprintf(buf
, PAGE_SIZE
, "reserved\n");
1455 else if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
))
1456 rc
= snprintf(buf
, PAGE_SIZE
, "lost\n");
1458 rc
= snprintf(buf
, PAGE_SIZE
, "none\n");
1459 dasd_put_device(device
);
1463 static ssize_t
dasd_reservation_state_store(struct device
*dev
,
1464 struct device_attribute
*attr
,
1465 const char *buf
, size_t count
)
1467 struct dasd_device
*device
;
1470 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1473 if (sysfs_streq("reset", buf
))
1474 clear_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
);
1477 dasd_put_device(device
);
1485 static DEVICE_ATTR(last_known_reservation_state
, 0644,
1486 dasd_reservation_state_show
, dasd_reservation_state_store
);
1488 static ssize_t
dasd_pm_show(struct device
*dev
,
1489 struct device_attribute
*attr
, char *buf
)
1491 struct dasd_device
*device
;
1492 u8 opm
, nppm
, cablepm
, cuirpm
, hpfpm
, ifccpm
;
1494 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1496 return sprintf(buf
, "0\n");
1498 opm
= dasd_path_get_opm(device
);
1499 nppm
= dasd_path_get_nppm(device
);
1500 cablepm
= dasd_path_get_cablepm(device
);
1501 cuirpm
= dasd_path_get_cuirpm(device
);
1502 hpfpm
= dasd_path_get_hpfpm(device
);
1503 ifccpm
= dasd_path_get_ifccpm(device
);
1504 dasd_put_device(device
);
1506 return sprintf(buf
, "%02x %02x %02x %02x %02x %02x\n", opm
, nppm
,
1507 cablepm
, cuirpm
, hpfpm
, ifccpm
);
1510 static DEVICE_ATTR(path_masks
, 0444, dasd_pm_show
, NULL
);
1513 * threshold value for IFCC/CCC errors
1516 dasd_path_threshold_show(struct device
*dev
,
1517 struct device_attribute
*attr
, char *buf
)
1519 struct dasd_device
*device
;
1522 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1525 len
= snprintf(buf
, PAGE_SIZE
, "%lu\n", device
->path_thrhld
);
1526 dasd_put_device(device
);
1531 dasd_path_threshold_store(struct device
*dev
, struct device_attribute
*attr
,
1532 const char *buf
, size_t count
)
1534 struct dasd_device
*device
;
1535 unsigned long flags
;
1538 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1542 if (kstrtoul(buf
, 10, &val
) != 0 || val
> DASD_THRHLD_MAX
) {
1543 dasd_put_device(device
);
1546 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev
)), flags
);
1547 device
->path_thrhld
= val
;
1548 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev
)), flags
);
1549 dasd_put_device(device
);
1553 static DEVICE_ATTR(path_threshold
, 0644, dasd_path_threshold_show
,
1554 dasd_path_threshold_store
);
1556 * interval for IFCC/CCC checks
1557 * meaning time with no IFCC/CCC error before the error counter
1561 dasd_path_interval_show(struct device
*dev
,
1562 struct device_attribute
*attr
, char *buf
)
1564 struct dasd_device
*device
;
1567 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1570 len
= snprintf(buf
, PAGE_SIZE
, "%lu\n", device
->path_interval
);
1571 dasd_put_device(device
);
1576 dasd_path_interval_store(struct device
*dev
, struct device_attribute
*attr
,
1577 const char *buf
, size_t count
)
1579 struct dasd_device
*device
;
1580 unsigned long flags
;
1583 device
= dasd_device_from_cdev(to_ccwdev(dev
));
1587 if ((kstrtoul(buf
, 10, &val
) != 0) ||
1588 (val
> DASD_INTERVAL_MAX
) || val
== 0) {
1589 dasd_put_device(device
);
1592 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev
)), flags
);
1594 device
->path_interval
= val
;
1595 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev
)), flags
);
1596 dasd_put_device(device
);
1600 static DEVICE_ATTR(path_interval
, 0644, dasd_path_interval_show
,
1601 dasd_path_interval_store
);
1604 static struct attribute
* dasd_attrs
[] = {
1605 &dev_attr_readonly
.attr
,
1606 &dev_attr_discipline
.attr
,
1607 &dev_attr_status
.attr
,
1608 &dev_attr_alias
.attr
,
1609 &dev_attr_vendor
.attr
,
1611 &dev_attr_use_diag
.attr
,
1612 &dev_attr_raw_track_access
.attr
,
1613 &dev_attr_eer_enabled
.attr
,
1614 &dev_attr_erplog
.attr
,
1615 &dev_attr_failfast
.attr
,
1616 &dev_attr_expires
.attr
,
1617 &dev_attr_retries
.attr
,
1618 &dev_attr_timeout
.attr
,
1619 &dev_attr_reservation_policy
.attr
,
1620 &dev_attr_last_known_reservation_state
.attr
,
1621 &dev_attr_safe_offline
.attr
,
1622 &dev_attr_host_access_count
.attr
,
1623 &dev_attr_path_masks
.attr
,
1624 &dev_attr_path_threshold
.attr
,
1625 &dev_attr_path_interval
.attr
,
1626 &dev_attr_path_reset
.attr
,
1631 static const struct attribute_group dasd_attr_group
= {
1632 .attrs
= dasd_attrs
,
1636 * Return value of the specified feature.
1639 dasd_get_feature(struct ccw_device
*cdev
, int feature
)
1641 struct dasd_devmap
*devmap
;
1643 devmap
= dasd_find_busid(dev_name(&cdev
->dev
));
1645 return PTR_ERR(devmap
);
1647 return ((devmap
->features
& feature
) != 0);
1651 * Set / reset given feature.
1652 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1655 dasd_set_feature(struct ccw_device
*cdev
, int feature
, int flag
)
1657 struct dasd_devmap
*devmap
;
1659 devmap
= dasd_devmap_from_cdev(cdev
);
1661 return PTR_ERR(devmap
);
1663 spin_lock(&dasd_devmap_lock
);
1665 devmap
->features
|= feature
;
1667 devmap
->features
&= ~feature
;
1669 devmap
->device
->features
= devmap
->features
;
1670 spin_unlock(&dasd_devmap_lock
);
1673 EXPORT_SYMBOL(dasd_set_feature
);
1677 dasd_add_sysfs_files(struct ccw_device
*cdev
)
1679 return sysfs_create_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
1683 dasd_remove_sysfs_files(struct ccw_device
*cdev
)
1685 sysfs_remove_group(&cdev
->dev
.kobj
, &dasd_attr_group
);
1690 dasd_devmap_init(void)
1694 /* Initialize devmap structures. */
1695 dasd_max_devindex
= 0;
1696 for (i
= 0; i
< 256; i
++)
1697 INIT_LIST_HEAD(&dasd_hashlists
[i
]);
1702 dasd_devmap_exit(void)
1704 dasd_forget_ranges();