1 // SPDX-License-Identifier: GPL-2.0
2 /*
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  * Copyright IBM Corp. 1999,2001
9  *
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.
13  *
14  */
15 
16 #define KMSG_COMPONENT "dasd"
17 
18 #include <linux/ctype.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 
23 #include <asm/debug.h>
24 #include <linux/uaccess.h>
25 #include <asm/ipl.h>
26 
27 /* This is ugly... */
28 #define PRINTK_HEADER "dasd_devmap:"
29 #define DASD_BUS_ID_SIZE 20
30 #define DASD_MAX_PARAMS 256
31 
32 #include "dasd_int.h"
33 
34 struct kmem_cache *dasd_page_cache;
35 EXPORT_SYMBOL_GPL(dasd_page_cache);
36 
37 /*
38  * dasd_devmap_t is used to store the features and the relation
39  * between device number and device index. To find a dasd_devmap_t
40  * that corresponds to a device number of a device index each
41  * dasd_devmap_t is added to two linked lists, one to search by
42  * the device number and one to search by the device index. As
43  * soon as big minor numbers are available the device index list
44  * can be removed since the device number will then be identical
45  * to the device index.
46  */
47 struct dasd_devmap {
48 	struct list_head list;
49 	char bus_id[DASD_BUS_ID_SIZE];
50         unsigned int devindex;
51         unsigned short features;
52 	struct dasd_device *device;
53 };
54 
55 /*
56  * Parameter parsing functions for dasd= parameter. The syntax is:
57  *   <devno>		: (0x)?[0-9a-fA-F]+
58  *   <busid>		: [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
59  *   <feature>		: ro
60  *   <feature_list>	: \(<feature>(:<feature>)*\)
61  *   <devno-range>	: <devno>(-<devno>)?<feature_list>?
62  *   <busid-range>	: <busid>(-<busid>)?<feature_list>?
63  *   <devices>		: <devno-range>|<busid-range>
64  *   <dasd_module>	: dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
65  *
66  *   <dasd>		: autodetect|probeonly|<devices>(,<devices>)*
67  */
68 
69 int dasd_probeonly =  0;	/* is true, when probeonly mode is active */
70 int dasd_autodetect = 0;	/* is true, when autodetection is active */
71 int dasd_nopav = 0;		/* is true, when PAV is disabled */
72 EXPORT_SYMBOL_GPL(dasd_nopav);
73 int dasd_nofcx;			/* disable High Performance Ficon */
74 EXPORT_SYMBOL_GPL(dasd_nofcx);
75 
76 /*
77  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
78  * it is named 'dasd' to directly be filled by insmod with the comma separated
79  * strings when running as a module.
80  */
81 static char *dasd[DASD_MAX_PARAMS];
82 module_param_array(dasd, charp, NULL, S_IRUGO);
83 
84 /*
85  * Single spinlock to protect devmap and servermap structures and lists.
86  */
87 static DEFINE_SPINLOCK(dasd_devmap_lock);
88 
89 /*
90  * Hash lists for devmap structures.
91  */
92 static struct list_head dasd_hashlists[256];
93 int dasd_max_devindex;
94 
95 static struct dasd_devmap *dasd_add_busid(const char *, int);
96 
97 static inline int
dasd_hash_busid(const char * bus_id)98 dasd_hash_busid(const char *bus_id)
99 {
100 	int hash, i;
101 
102 	hash = 0;
103 	for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
104 		hash += *bus_id;
105 	return hash & 0xff;
106 }
107 
108 #ifndef MODULE
dasd_call_setup(char * opt)109 static int __init dasd_call_setup(char *opt)
110 {
111 	static int i __initdata;
112 	char *tmp;
113 
114 	while (i < DASD_MAX_PARAMS) {
115 		tmp = strsep(&opt, ",");
116 		if (!tmp)
117 			break;
118 
119 		dasd[i++] = tmp;
120 	}
121 
122 	return 1;
123 }
124 
125 __setup ("dasd=", dasd_call_setup);
126 #endif	/* #ifndef MODULE */
127 
128 #define	DASD_IPLDEV	"ipldev"
129 
130 /*
131  * Read a device busid/devno from a string.
132  */
dasd_busid(char * str,int * id0,int * id1,int * devno)133 static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
134 {
135 	unsigned int val;
136 	char *tok;
137 
138 	/* Interpret ipldev busid */
139 	if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) {
140 		if (ipl_info.type != IPL_TYPE_CCW) {
141 			pr_err("The IPL device is not a CCW device\n");
142 			return -EINVAL;
143 		}
144 		*id0 = 0;
145 		*id1 = ipl_info.data.ccw.dev_id.ssid;
146 		*devno = ipl_info.data.ccw.dev_id.devno;
147 
148 		return 0;
149 	}
150 
151 	/* Old style 0xXXXX or XXXX */
152 	if (!kstrtouint(str, 16, &val)) {
153 		*id0 = *id1 = 0;
154 		if (val > 0xffff)
155 			return -EINVAL;
156 		*devno = val;
157 		return 0;
158 	}
159 
160 	/* New style x.y.z busid */
161 	tok = strsep(&str, ".");
162 	if (kstrtouint(tok, 16, &val) || val > 0xff)
163 		return -EINVAL;
164 	*id0 = val;
165 
166 	tok = strsep(&str, ".");
167 	if (kstrtouint(tok, 16, &val) || val > 0xff)
168 		return -EINVAL;
169 	*id1 = val;
170 
171 	tok = strsep(&str, ".");
172 	if (kstrtouint(tok, 16, &val) || val > 0xffff)
173 		return -EINVAL;
174 	*devno = val;
175 
176 	return 0;
177 }
178 
179 /*
180  * Read colon separated list of dasd features.
181  */
dasd_feature_list(char * str)182 static int __init dasd_feature_list(char *str)
183 {
184 	int features, len, rc;
185 
186 	features = 0;
187 	rc = 0;
188 
189 	if (!str)
190 		return DASD_FEATURE_DEFAULT;
191 
192 	while (1) {
193 		for (len = 0;
194 		     str[len] && str[len] != ':' && str[len] != ')'; len++);
195 		if (len == 2 && !strncmp(str, "ro", 2))
196 			features |= DASD_FEATURE_READONLY;
197 		else if (len == 4 && !strncmp(str, "diag", 4))
198 			features |= DASD_FEATURE_USEDIAG;
199 		else if (len == 3 && !strncmp(str, "raw", 3))
200 			features |= DASD_FEATURE_USERAW;
201 		else if (len == 6 && !strncmp(str, "erplog", 6))
202 			features |= DASD_FEATURE_ERPLOG;
203 		else if (len == 8 && !strncmp(str, "failfast", 8))
204 			features |= DASD_FEATURE_FAILFAST;
205 		else {
206 			pr_warn("%*s is not a supported device option\n",
207 				len, str);
208 			rc = -EINVAL;
209 		}
210 		str += len;
211 		if (*str != ':')
212 			break;
213 		str++;
214 	}
215 
216 	return rc ? : features;
217 }
218 
219 /*
220  * Try to match the first element on the comma separated parse string
221  * with one of the known keywords. If a keyword is found, take the approprate
222  * action and return a pointer to the residual string. If the first element
223  * could not be matched to any keyword then return an error code.
224  */
dasd_parse_keyword(char * keyword)225 static int __init dasd_parse_keyword(char *keyword)
226 {
227 	int length = strlen(keyword);
228 
229 	if (strncmp("autodetect", keyword, length) == 0) {
230 		dasd_autodetect = 1;
231 		pr_info("The autodetection mode has been activated\n");
232 		return 0;
233         }
234 	if (strncmp("probeonly", keyword, length) == 0) {
235 		dasd_probeonly = 1;
236 		pr_info("The probeonly mode has been activated\n");
237 		return 0;
238         }
239 	if (strncmp("nopav", keyword, length) == 0) {
240 		if (MACHINE_IS_VM)
241 			pr_info("'nopav' is not supported on z/VM\n");
242 		else {
243 			dasd_nopav = 1;
244 			pr_info("PAV support has be deactivated\n");
245 		}
246 		return 0;
247 	}
248 	if (strncmp("nofcx", keyword, length) == 0) {
249 		dasd_nofcx = 1;
250 		pr_info("High Performance FICON support has been "
251 			"deactivated\n");
252 		return 0;
253 	}
254 	if (strncmp("fixedbuffers", keyword, length) == 0) {
255 		if (dasd_page_cache)
256 			return 0;
257 		dasd_page_cache =
258 			kmem_cache_create("dasd_page_cache", PAGE_SIZE,
259 					  PAGE_SIZE, SLAB_CACHE_DMA,
260 					  NULL);
261 		if (!dasd_page_cache)
262 			DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
263 				"fixed buffer mode disabled.");
264 		else
265 			DBF_EVENT(DBF_INFO, "%s",
266 				 "turning on fixed buffer mode");
267 		return 0;
268 	}
269 
270 	return -EINVAL;
271 }
272 
273 /*
274  * Split a string of a device range into its pieces and return the from, to, and
275  * feature parts separately.
276  * e.g.:
277  * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
278  * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
279  * 0x4321 -> from: 0x4321 to: null features: null
280  */
dasd_evaluate_range_param(char * range,char ** from_str,char ** to_str,char ** features_str)281 static int __init dasd_evaluate_range_param(char *range, char **from_str,
282 					    char **to_str, char **features_str)
283 {
284 	int rc = 0;
285 
286 	/* Do we have a range or a single device? */
287 	if (strchr(range, '-')) {
288 		*from_str = strsep(&range, "-");
289 		*to_str = strsep(&range, "(");
290 		*features_str = strsep(&range, ")");
291 	} else {
292 		*from_str = strsep(&range, "(");
293 		*features_str = strsep(&range, ")");
294 	}
295 
296 	if (*features_str && !range) {
297 		pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
298 		rc = -EINVAL;
299 	}
300 
301 	return rc;
302 }
303 
304 /*
305  * Try to interprete the range string as a device number or a range of devices.
306  * If the interpretation is successful, create the matching dasd_devmap entries.
307  * If interpretation fails or in case of an error, return an error code.
308  */
dasd_parse_range(const char * range)309 static int __init dasd_parse_range(const char *range)
310 {
311 	struct dasd_devmap *devmap;
312 	int from, from_id0, from_id1;
313 	int to, to_id0, to_id1;
314 	int features;
315 	char bus_id[DASD_BUS_ID_SIZE + 1];
316 	char *features_str = NULL;
317 	char *from_str = NULL;
318 	char *to_str = NULL;
319 	int rc = 0;
320 	char *tmp;
321 
322 	tmp = kstrdup(range, GFP_KERNEL);
323 	if (!tmp)
324 		return -ENOMEM;
325 
326 	if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) {
327 		rc = -EINVAL;
328 		goto out;
329 	}
330 
331 	if (dasd_busid(from_str, &from_id0, &from_id1, &from)) {
332 		rc = -EINVAL;
333 		goto out;
334 	}
335 
336 	to = from;
337 	to_id0 = from_id0;
338 	to_id1 = from_id1;
339 	if (to_str) {
340 		if (dasd_busid(to_str, &to_id0, &to_id1, &to)) {
341 			rc = -EINVAL;
342 			goto out;
343 		}
344 		if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) {
345 			pr_err("%s is not a valid device range\n", range);
346 			rc = -EINVAL;
347 			goto out;
348 		}
349 	}
350 
351 	features = dasd_feature_list(features_str);
352 	if (features < 0) {
353 		rc = -EINVAL;
354 		goto out;
355 	}
356 	/* each device in dasd= parameter should be set initially online */
357 	features |= DASD_FEATURE_INITIAL_ONLINE;
358 	while (from <= to) {
359 		sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
360 		devmap = dasd_add_busid(bus_id, features);
361 		if (IS_ERR(devmap)) {
362 			rc = PTR_ERR(devmap);
363 			goto out;
364 		}
365 	}
366 
367 out:
368 	kfree(tmp);
369 
370 	return rc;
371 }
372 
373 /*
374  * Parse parameters stored in dasd[]
375  * The 'dasd=...' parameter allows to specify a comma separated list of
376  * keywords and device ranges. The parameters in that list will be stored as
377  * separate elementes in dasd[].
378  */
dasd_parse(void)379 int __init dasd_parse(void)
380 {
381 	int rc, i;
382 	char *cur;
383 
384 	rc = 0;
385 	for (i = 0; i < DASD_MAX_PARAMS; i++) {
386 		cur = dasd[i];
387 		if (!cur)
388 			break;
389 		if (*cur == '\0')
390 			continue;
391 
392 		rc = dasd_parse_keyword(cur);
393 		if (rc)
394 			rc = dasd_parse_range(cur);
395 
396 		if (rc)
397 			break;
398 	}
399 
400 	return rc;
401 }
402 
403 /*
404  * Add a devmap for the device specified by busid. It is possible that
405  * the devmap already exists (dasd= parameter). The order of the devices
406  * added through this function will define the kdevs for the individual
407  * devices.
408  */
409 static struct dasd_devmap *
dasd_add_busid(const char * bus_id,int features)410 dasd_add_busid(const char *bus_id, int features)
411 {
412 	struct dasd_devmap *devmap, *new, *tmp;
413 	int hash;
414 
415 	new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
416 	if (!new)
417 		return ERR_PTR(-ENOMEM);
418 	spin_lock(&dasd_devmap_lock);
419 	devmap = NULL;
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) {
423 			devmap = tmp;
424 			break;
425 		}
426 	if (!devmap) {
427 		/* This bus_id is new. */
428 		new->devindex = dasd_max_devindex++;
429 		strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
430 		new->features = features;
431 		new->device = NULL;
432 		list_add(&new->list, &dasd_hashlists[hash]);
433 		devmap = new;
434 		new = NULL;
435 	}
436 	spin_unlock(&dasd_devmap_lock);
437 	kfree(new);
438 	return devmap;
439 }
440 
441 /*
442  * Find devmap for device with given bus_id.
443  */
444 static struct dasd_devmap *
dasd_find_busid(const char * bus_id)445 dasd_find_busid(const char *bus_id)
446 {
447 	struct dasd_devmap *devmap, *tmp;
448 	int hash;
449 
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) {
455 			devmap = tmp;
456 			break;
457 		}
458 	}
459 	spin_unlock(&dasd_devmap_lock);
460 	return devmap;
461 }
462 
463 /*
464  * Check if busid has been added to the list of dasd ranges.
465  */
466 int
dasd_busid_known(const char * bus_id)467 dasd_busid_known(const char *bus_id)
468 {
469 	return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
470 }
471 
472 /*
473  * Forget all about the device numbers added so far.
474  * This may only be called at module unload or system shutdown.
475  */
476 static void
dasd_forget_ranges(void)477 dasd_forget_ranges(void)
478 {
479 	struct dasd_devmap *devmap, *n;
480 	int i;
481 
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);
487 			kfree(devmap);
488 		}
489 	}
490 	spin_unlock(&dasd_devmap_lock);
491 }
492 
493 /*
494  * Find the device struct by its device index.
495  */
496 struct dasd_device *
dasd_device_from_devindex(int devindex)497 dasd_device_from_devindex(int devindex)
498 {
499 	struct dasd_devmap *devmap, *tmp;
500 	struct dasd_device *device;
501 	int i;
502 
503 	spin_lock(&dasd_devmap_lock);
504 	devmap = NULL;
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. */
509 				devmap = tmp;
510 				break;
511 			}
512 	if (devmap && devmap->device) {
513 		device = devmap->device;
514 		dasd_get_device(device);
515 	} else
516 		device = ERR_PTR(-ENODEV);
517 	spin_unlock(&dasd_devmap_lock);
518 	return device;
519 }
520 
521 /*
522  * Return devmap for cdev. If no devmap exists yet, create one and
523  * connect it to the cdev.
524  */
525 static struct dasd_devmap *
dasd_devmap_from_cdev(struct ccw_device * cdev)526 dasd_devmap_from_cdev(struct ccw_device *cdev)
527 {
528 	struct dasd_devmap *devmap;
529 
530 	devmap = dasd_find_busid(dev_name(&cdev->dev));
531 	if (IS_ERR(devmap))
532 		devmap = dasd_add_busid(dev_name(&cdev->dev),
533 					DASD_FEATURE_DEFAULT);
534 	return devmap;
535 }
536 
537 /*
538  * Create a dasd device structure for cdev.
539  */
540 struct dasd_device *
dasd_create_device(struct ccw_device * cdev)541 dasd_create_device(struct ccw_device *cdev)
542 {
543 	struct dasd_devmap *devmap;
544 	struct dasd_device *device;
545 	unsigned long flags;
546 	int rc;
547 
548 	devmap = dasd_devmap_from_cdev(cdev);
549 	if (IS_ERR(devmap))
550 		return (void *) devmap;
551 
552 	device = dasd_alloc_device();
553 	if (IS_ERR(device))
554 		return device;
555 	atomic_set(&device->ref_count, 3);
556 
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);
563 		device->cdev = cdev;
564 		rc = 0;
565 	} else
566 		/* Someone else was faster. */
567 		rc = -EBUSY;
568 	spin_unlock(&dasd_devmap_lock);
569 
570 	if (rc) {
571 		dasd_free_device(device);
572 		return ERR_PTR(rc);
573 	}
574 
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);
578 
579 	return device;
580 }
581 
582 /*
583  * Wait queue for dasd_delete_device waits.
584  */
585 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
586 
587 /*
588  * Remove a dasd device structure. The passed referenced
589  * is destroyed.
590  */
591 void
dasd_delete_device(struct dasd_device * device)592 dasd_delete_device(struct dasd_device *device)
593 {
594 	struct ccw_device *cdev;
595 	struct dasd_devmap *devmap;
596 	unsigned long flags;
597 
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);
605 		return;
606 	}
607 	devmap->device = NULL;
608 	spin_unlock(&dasd_devmap_lock);
609 
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);
614 
615 	/*
616 	 * Drop ref_count by 3, one for the devmap reference, one for
617 	 * the cdev reference and one for the passed reference.
618 	 */
619 	atomic_sub(3, &device->ref_count);
620 
621 	/* Wait for reference counter to drop to zero. */
622 	wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
623 
624 	dasd_generic_free_discipline(device);
625 	/* Disconnect dasd_device structure from ccw_device structure. */
626 	cdev = device->cdev;
627 	device->cdev = NULL;
628 
629 	/* Put ccw_device structure. */
630 	put_device(&cdev->dev);
631 
632 	/* Now the device structure can be freed. */
633 	dasd_free_device(device);
634 }
635 
636 /*
637  * Reference counter dropped to zero. Wake up waiter
638  * in dasd_delete_device.
639  */
640 void
dasd_put_device_wake(struct dasd_device * device)641 dasd_put_device_wake(struct dasd_device *device)
642 {
643 	wake_up(&dasd_delete_wq);
644 }
645 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
646 
647 /*
648  * Return dasd_device structure associated with cdev.
649  * This function needs to be called with the ccw device
650  * lock held. It can be used from interrupt context.
651  */
652 struct dasd_device *
dasd_device_from_cdev_locked(struct ccw_device * cdev)653 dasd_device_from_cdev_locked(struct ccw_device *cdev)
654 {
655 	struct dasd_device *device = dev_get_drvdata(&cdev->dev);
656 
657 	if (!device)
658 		return ERR_PTR(-ENODEV);
659 	dasd_get_device(device);
660 	return device;
661 }
662 
663 /*
664  * Return dasd_device structure associated with cdev.
665  */
666 struct dasd_device *
dasd_device_from_cdev(struct ccw_device * cdev)667 dasd_device_from_cdev(struct ccw_device *cdev)
668 {
669 	struct dasd_device *device;
670 	unsigned long flags;
671 
672 	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
673 	device = dasd_device_from_cdev_locked(cdev);
674 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
675 	return device;
676 }
677 
dasd_add_link_to_gendisk(struct gendisk * gdp,struct dasd_device * device)678 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
679 {
680 	struct dasd_devmap *devmap;
681 
682 	devmap = dasd_find_busid(dev_name(&device->cdev->dev));
683 	if (IS_ERR(devmap))
684 		return;
685 	spin_lock(&dasd_devmap_lock);
686 	gdp->private_data = devmap;
687 	spin_unlock(&dasd_devmap_lock);
688 }
689 
dasd_device_from_gendisk(struct gendisk * gdp)690 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
691 {
692 	struct dasd_device *device;
693 	struct dasd_devmap *devmap;
694 
695 	if (!gdp->private_data)
696 		return NULL;
697 	device = NULL;
698 	spin_lock(&dasd_devmap_lock);
699 	devmap = gdp->private_data;
700 	if (devmap && devmap->device) {
701 		device = devmap->device;
702 		dasd_get_device(device);
703 	}
704 	spin_unlock(&dasd_devmap_lock);
705 	return device;
706 }
707 
708 /*
709  * SECTION: files in sysfs
710  */
711 
712 /*
713  * failfast controls the behaviour, if no path is available
714  */
dasd_ff_show(struct device * dev,struct device_attribute * attr,char * buf)715 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
716 			    char *buf)
717 {
718 	struct dasd_devmap *devmap;
719 	int ff_flag;
720 
721 	devmap = dasd_find_busid(dev_name(dev));
722 	if (!IS_ERR(devmap))
723 		ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
724 	else
725 		ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
726 	return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
727 }
728 
dasd_ff_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)729 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
730 	      const char *buf, size_t count)
731 {
732 	unsigned int val;
733 	int rc;
734 
735 	if (kstrtouint(buf, 0, &val) || val > 1)
736 		return -EINVAL;
737 
738 	rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
739 
740 	return rc ? : count;
741 }
742 
743 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
744 
745 /*
746  * readonly controls the readonly status of a dasd
747  */
748 static ssize_t
dasd_ro_show(struct device * dev,struct device_attribute * attr,char * buf)749 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
750 {
751 	struct dasd_devmap *devmap;
752 	struct dasd_device *device;
753 	int ro_flag = 0;
754 
755 	devmap = dasd_find_busid(dev_name(dev));
756 	if (IS_ERR(devmap))
757 		goto out;
758 
759 	ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
760 
761 	spin_lock(&dasd_devmap_lock);
762 	device = devmap->device;
763 	if (device)
764 		ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
765 	spin_unlock(&dasd_devmap_lock);
766 
767 out:
768 	return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
769 }
770 
771 static ssize_t
dasd_ro_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
773 	      const char *buf, size_t count)
774 {
775 	struct ccw_device *cdev = to_ccwdev(dev);
776 	struct dasd_device *device;
777 	unsigned long flags;
778 	unsigned int val;
779 	int rc;
780 
781 	if (kstrtouint(buf, 0, &val) || val > 1)
782 		return -EINVAL;
783 
784 	rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
785 	if (rc)
786 		return rc;
787 
788 	device = dasd_device_from_cdev(cdev);
789 	if (IS_ERR(device))
790 		return count;
791 
792 	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
793 	val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
794 
795 	if (!device->block || !device->block->gdp ||
796 	    test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
797 		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
798 		goto out;
799 	}
800 	/* Increase open_count to avoid losing the block device */
801 	atomic_inc(&device->block->open_count);
802 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
803 
804 	set_disk_ro(device->block->gdp, val);
805 	atomic_dec(&device->block->open_count);
806 
807 out:
808 	dasd_put_device(device);
809 
810 	return count;
811 }
812 
813 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
814 /*
815  * erplog controls the logging of ERP related data
816  * (e.g. failing channel programs).
817  */
818 static ssize_t
dasd_erplog_show(struct device * dev,struct device_attribute * attr,char * buf)819 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
820 {
821 	struct dasd_devmap *devmap;
822 	int erplog;
823 
824 	devmap = dasd_find_busid(dev_name(dev));
825 	if (!IS_ERR(devmap))
826 		erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
827 	else
828 		erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
829 	return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
830 }
831 
832 static ssize_t
dasd_erplog_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)833 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
834 	      const char *buf, size_t count)
835 {
836 	unsigned int val;
837 	int rc;
838 
839 	if (kstrtouint(buf, 0, &val) || val > 1)
840 		return -EINVAL;
841 
842 	rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
843 
844 	return rc ? : count;
845 }
846 
847 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
848 
849 /*
850  * use_diag controls whether the driver should use diag rather than ssch
851  * to talk to the device
852  */
853 static ssize_t
dasd_use_diag_show(struct device * dev,struct device_attribute * attr,char * buf)854 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
855 {
856 	struct dasd_devmap *devmap;
857 	int use_diag;
858 
859 	devmap = dasd_find_busid(dev_name(dev));
860 	if (!IS_ERR(devmap))
861 		use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
862 	else
863 		use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
864 	return sprintf(buf, use_diag ? "1\n" : "0\n");
865 }
866 
867 static ssize_t
dasd_use_diag_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)868 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
869 		    const char *buf, size_t count)
870 {
871 	struct dasd_devmap *devmap;
872 	unsigned int val;
873 	ssize_t rc;
874 
875 	devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
876 	if (IS_ERR(devmap))
877 		return PTR_ERR(devmap);
878 
879 	if (kstrtouint(buf, 0, &val) || val > 1)
880 		return -EINVAL;
881 
882 	spin_lock(&dasd_devmap_lock);
883 	/* Changing diag discipline flag is only allowed in offline state. */
884 	rc = count;
885 	if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
886 		if (val)
887 			devmap->features |= DASD_FEATURE_USEDIAG;
888 		else
889 			devmap->features &= ~DASD_FEATURE_USEDIAG;
890 	} else
891 		rc = -EPERM;
892 	spin_unlock(&dasd_devmap_lock);
893 	return rc;
894 }
895 
896 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
897 
898 /*
899  * use_raw controls whether the driver should give access to raw eckd data or
900  * operate in standard mode
901  */
902 static ssize_t
dasd_use_raw_show(struct device * dev,struct device_attribute * attr,char * buf)903 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
904 {
905 	struct dasd_devmap *devmap;
906 	int use_raw;
907 
908 	devmap = dasd_find_busid(dev_name(dev));
909 	if (!IS_ERR(devmap))
910 		use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
911 	else
912 		use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
913 	return sprintf(buf, use_raw ? "1\n" : "0\n");
914 }
915 
916 static ssize_t
dasd_use_raw_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)917 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
918 		    const char *buf, size_t count)
919 {
920 	struct dasd_devmap *devmap;
921 	ssize_t rc;
922 	unsigned long val;
923 
924 	devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
925 	if (IS_ERR(devmap))
926 		return PTR_ERR(devmap);
927 
928 	if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
929 		return -EINVAL;
930 
931 	spin_lock(&dasd_devmap_lock);
932 	/* Changing diag discipline flag is only allowed in offline state. */
933 	rc = count;
934 	if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
935 		if (val)
936 			devmap->features |= DASD_FEATURE_USERAW;
937 		else
938 			devmap->features &= ~DASD_FEATURE_USERAW;
939 	} else
940 		rc = -EPERM;
941 	spin_unlock(&dasd_devmap_lock);
942 	return rc;
943 }
944 
945 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
946 		   dasd_use_raw_store);
947 
948 static ssize_t
dasd_safe_offline_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)949 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
950 			const char *buf, size_t count)
951 {
952 	struct ccw_device *cdev = to_ccwdev(dev);
953 	struct dasd_device *device;
954 	unsigned long flags;
955 	int rc;
956 
957 	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
958 	device = dasd_device_from_cdev_locked(cdev);
959 	if (IS_ERR(device)) {
960 		rc = PTR_ERR(device);
961 		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
962 		goto out;
963 	}
964 
965 	if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
966 	    test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
967 		/* Already doing offline processing */
968 		dasd_put_device(device);
969 		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
970 		rc = -EBUSY;
971 		goto out;
972 	}
973 
974 	set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
975 	dasd_put_device(device);
976 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
977 
978 	rc = ccw_device_set_offline(cdev);
979 
980 out:
981 	return rc ? rc : count;
982 }
983 
984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
985 
986 static ssize_t
dasd_access_show(struct device * dev,struct device_attribute * attr,char * buf)987 dasd_access_show(struct device *dev, struct device_attribute *attr,
988 		 char *buf)
989 {
990 	struct ccw_device *cdev = to_ccwdev(dev);
991 	struct dasd_device *device;
992 	int count;
993 
994 	device = dasd_device_from_cdev(cdev);
995 	if (IS_ERR(device))
996 		return PTR_ERR(device);
997 
998 	if (!device->discipline)
999 		count = -ENODEV;
1000 	else if (!device->discipline->host_access_count)
1001 		count = -EOPNOTSUPP;
1002 	else
1003 		count = device->discipline->host_access_count(device);
1004 
1005 	dasd_put_device(device);
1006 	if (count < 0)
1007 		return count;
1008 
1009 	return sprintf(buf, "%d\n", count);
1010 }
1011 
1012 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1013 
1014 static ssize_t
dasd_discipline_show(struct device * dev,struct device_attribute * attr,char * buf)1015 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1016 		     char *buf)
1017 {
1018 	struct dasd_device *device;
1019 	ssize_t len;
1020 
1021 	device = dasd_device_from_cdev(to_ccwdev(dev));
1022 	if (IS_ERR(device))
1023 		goto out;
1024 	else if (!device->discipline) {
1025 		dasd_put_device(device);
1026 		goto out;
1027 	} else {
1028 		len = snprintf(buf, PAGE_SIZE, "%s\n",
1029 			       device->discipline->name);
1030 		dasd_put_device(device);
1031 		return len;
1032 	}
1033 out:
1034 	len = snprintf(buf, PAGE_SIZE, "none\n");
1035 	return len;
1036 }
1037 
1038 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1039 
1040 static ssize_t
dasd_device_status_show(struct device * dev,struct device_attribute * attr,char * buf)1041 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1042 		     char *buf)
1043 {
1044 	struct dasd_device *device;
1045 	ssize_t len;
1046 
1047 	device = dasd_device_from_cdev(to_ccwdev(dev));
1048 	if (!IS_ERR(device)) {
1049 		switch (device->state) {
1050 		case DASD_STATE_NEW:
1051 			len = snprintf(buf, PAGE_SIZE, "new\n");
1052 			break;
1053 		case DASD_STATE_KNOWN:
1054 			len = snprintf(buf, PAGE_SIZE, "detected\n");
1055 			break;
1056 		case DASD_STATE_BASIC:
1057 			len = snprintf(buf, PAGE_SIZE, "basic\n");
1058 			break;
1059 		case DASD_STATE_UNFMT:
1060 			len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1061 			break;
1062 		case DASD_STATE_READY:
1063 			len = snprintf(buf, PAGE_SIZE, "ready\n");
1064 			break;
1065 		case DASD_STATE_ONLINE:
1066 			len = snprintf(buf, PAGE_SIZE, "online\n");
1067 			break;
1068 		default:
1069 			len = snprintf(buf, PAGE_SIZE, "no stat\n");
1070 			break;
1071 		}
1072 		dasd_put_device(device);
1073 	} else
1074 		len = snprintf(buf, PAGE_SIZE, "unknown\n");
1075 	return len;
1076 }
1077 
1078 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1079 
dasd_alias_show(struct device * dev,struct device_attribute * attr,char * buf)1080 static ssize_t dasd_alias_show(struct device *dev,
1081 			       struct device_attribute *attr, char *buf)
1082 {
1083 	struct dasd_device *device;
1084 	struct dasd_uid uid;
1085 
1086 	device = dasd_device_from_cdev(to_ccwdev(dev));
1087 	if (IS_ERR(device))
1088 		return sprintf(buf, "0\n");
1089 
1090 	if (device->discipline && device->discipline->get_uid &&
1091 	    !device->discipline->get_uid(device, &uid)) {
1092 		if (uid.type == UA_BASE_PAV_ALIAS ||
1093 		    uid.type == UA_HYPER_PAV_ALIAS) {
1094 			dasd_put_device(device);
1095 			return sprintf(buf, "1\n");
1096 		}
1097 	}
1098 	dasd_put_device(device);
1099 
1100 	return sprintf(buf, "0\n");
1101 }
1102 
1103 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1104 
dasd_vendor_show(struct device * dev,struct device_attribute * attr,char * buf)1105 static ssize_t dasd_vendor_show(struct device *dev,
1106 				struct device_attribute *attr, char *buf)
1107 {
1108 	struct dasd_device *device;
1109 	struct dasd_uid uid;
1110 	char *vendor;
1111 
1112 	device = dasd_device_from_cdev(to_ccwdev(dev));
1113 	vendor = "";
1114 	if (IS_ERR(device))
1115 		return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1116 
1117 	if (device->discipline && device->discipline->get_uid &&
1118 	    !device->discipline->get_uid(device, &uid))
1119 			vendor = uid.vendor;
1120 
1121 	dasd_put_device(device);
1122 
1123 	return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1124 }
1125 
1126 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1127 
1128 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1129 		     /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1130 		     /* vduit */ 32 + 1)
1131 
1132 static ssize_t
dasd_uid_show(struct device * dev,struct device_attribute * attr,char * buf)1133 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1134 {
1135 	struct dasd_device *device;
1136 	struct dasd_uid uid;
1137 	char uid_string[UID_STRLEN];
1138 	char ua_string[3];
1139 
1140 	device = dasd_device_from_cdev(to_ccwdev(dev));
1141 	uid_string[0] = 0;
1142 	if (IS_ERR(device))
1143 		return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1144 
1145 	if (device->discipline && device->discipline->get_uid &&
1146 	    !device->discipline->get_uid(device, &uid)) {
1147 		switch (uid.type) {
1148 		case UA_BASE_DEVICE:
1149 			snprintf(ua_string, sizeof(ua_string), "%02x",
1150 				 uid.real_unit_addr);
1151 			break;
1152 		case UA_BASE_PAV_ALIAS:
1153 			snprintf(ua_string, sizeof(ua_string), "%02x",
1154 				 uid.base_unit_addr);
1155 			break;
1156 		case UA_HYPER_PAV_ALIAS:
1157 			snprintf(ua_string, sizeof(ua_string), "xx");
1158 			break;
1159 		default:
1160 			/* should not happen, treat like base device */
1161 			snprintf(ua_string, sizeof(ua_string), "%02x",
1162 				 uid.real_unit_addr);
1163 			break;
1164 		}
1165 
1166 		if (strlen(uid.vduit) > 0)
1167 			snprintf(uid_string, sizeof(uid_string),
1168 				 "%s.%s.%04x.%s.%s",
1169 				 uid.vendor, uid.serial, uid.ssid, ua_string,
1170 				 uid.vduit);
1171 		else
1172 			snprintf(uid_string, sizeof(uid_string),
1173 				 "%s.%s.%04x.%s",
1174 				 uid.vendor, uid.serial, uid.ssid, ua_string);
1175 	}
1176 	dasd_put_device(device);
1177 
1178 	return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1179 }
1180 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1181 
1182 /*
1183  * extended error-reporting
1184  */
1185 static ssize_t
dasd_eer_show(struct device * dev,struct device_attribute * attr,char * buf)1186 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1187 {
1188 	struct dasd_devmap *devmap;
1189 	int eer_flag;
1190 
1191 	devmap = dasd_find_busid(dev_name(dev));
1192 	if (!IS_ERR(devmap) && devmap->device)
1193 		eer_flag = dasd_eer_enabled(devmap->device);
1194 	else
1195 		eer_flag = 0;
1196 	return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1197 }
1198 
1199 static ssize_t
dasd_eer_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1200 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1201 	       const char *buf, size_t count)
1202 {
1203 	struct dasd_device *device;
1204 	unsigned int val;
1205 	int rc = 0;
1206 
1207 	device = dasd_device_from_cdev(to_ccwdev(dev));
1208 	if (IS_ERR(device))
1209 		return PTR_ERR(device);
1210 
1211 	if (kstrtouint(buf, 0, &val) || val > 1)
1212 		return -EINVAL;
1213 
1214 	if (val)
1215 		rc = dasd_eer_enable(device);
1216 	else
1217 		dasd_eer_disable(device);
1218 
1219 	dasd_put_device(device);
1220 
1221 	return rc ? : count;
1222 }
1223 
1224 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1225 
1226 /*
1227  * expiration time for default requests
1228  */
1229 static ssize_t
dasd_expires_show(struct device * dev,struct device_attribute * attr,char * buf)1230 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1231 {
1232 	struct dasd_device *device;
1233 	int len;
1234 
1235 	device = dasd_device_from_cdev(to_ccwdev(dev));
1236 	if (IS_ERR(device))
1237 		return -ENODEV;
1238 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1239 	dasd_put_device(device);
1240 	return len;
1241 }
1242 
1243 static ssize_t
dasd_expires_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1244 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1245 	       const char *buf, size_t count)
1246 {
1247 	struct dasd_device *device;
1248 	unsigned long val;
1249 
1250 	device = dasd_device_from_cdev(to_ccwdev(dev));
1251 	if (IS_ERR(device))
1252 		return -ENODEV;
1253 
1254 	if ((kstrtoul(buf, 10, &val) != 0) ||
1255 	    (val > DASD_EXPIRES_MAX) || val == 0) {
1256 		dasd_put_device(device);
1257 		return -EINVAL;
1258 	}
1259 
1260 	if (val)
1261 		device->default_expires = val;
1262 
1263 	dasd_put_device(device);
1264 	return count;
1265 }
1266 
1267 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1268 
1269 static ssize_t
dasd_retries_show(struct device * dev,struct device_attribute * attr,char * buf)1270 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1271 {
1272 	struct dasd_device *device;
1273 	int len;
1274 
1275 	device = dasd_device_from_cdev(to_ccwdev(dev));
1276 	if (IS_ERR(device))
1277 		return -ENODEV;
1278 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1279 	dasd_put_device(device);
1280 	return len;
1281 }
1282 
1283 static ssize_t
dasd_retries_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1284 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1285 		   const char *buf, size_t count)
1286 {
1287 	struct dasd_device *device;
1288 	unsigned long val;
1289 
1290 	device = dasd_device_from_cdev(to_ccwdev(dev));
1291 	if (IS_ERR(device))
1292 		return -ENODEV;
1293 
1294 	if ((kstrtoul(buf, 10, &val) != 0) ||
1295 	    (val > DASD_RETRIES_MAX)) {
1296 		dasd_put_device(device);
1297 		return -EINVAL;
1298 	}
1299 
1300 	if (val)
1301 		device->default_retries = val;
1302 
1303 	dasd_put_device(device);
1304 	return count;
1305 }
1306 
1307 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1308 
1309 static ssize_t
dasd_timeout_show(struct device * dev,struct device_attribute * attr,char * buf)1310 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1311 		  char *buf)
1312 {
1313 	struct dasd_device *device;
1314 	int len;
1315 
1316 	device = dasd_device_from_cdev(to_ccwdev(dev));
1317 	if (IS_ERR(device))
1318 		return -ENODEV;
1319 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1320 	dasd_put_device(device);
1321 	return len;
1322 }
1323 
1324 static ssize_t
dasd_timeout_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1325 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1326 		   const char *buf, size_t count)
1327 {
1328 	struct dasd_device *device;
1329 	struct request_queue *q;
1330 	unsigned long val;
1331 
1332 	device = dasd_device_from_cdev(to_ccwdev(dev));
1333 	if (IS_ERR(device) || !device->block)
1334 		return -ENODEV;
1335 
1336 	if ((kstrtoul(buf, 10, &val) != 0) ||
1337 	    val > UINT_MAX / HZ) {
1338 		dasd_put_device(device);
1339 		return -EINVAL;
1340 	}
1341 	q = device->block->request_queue;
1342 	if (!q) {
1343 		dasd_put_device(device);
1344 		return -ENODEV;
1345 	}
1346 
1347 	device->blk_timeout = val;
1348 
1349 	blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1350 
1351 	dasd_put_device(device);
1352 	return count;
1353 }
1354 
1355 static DEVICE_ATTR(timeout, 0644,
1356 		   dasd_timeout_show, dasd_timeout_store);
1357 
1358 
1359 static ssize_t
dasd_path_reset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1360 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1361 		      const char *buf, size_t count)
1362 {
1363 	struct dasd_device *device;
1364 	unsigned int val;
1365 
1366 	device = dasd_device_from_cdev(to_ccwdev(dev));
1367 	if (IS_ERR(device))
1368 		return -ENODEV;
1369 
1370 	if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1371 		val = 0;
1372 
1373 	if (device->discipline && device->discipline->reset_path)
1374 		device->discipline->reset_path(device, (__u8) val);
1375 
1376 	dasd_put_device(device);
1377 	return count;
1378 }
1379 
1380 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1381 
dasd_hpf_show(struct device * dev,struct device_attribute * attr,char * buf)1382 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1383 			     char *buf)
1384 {
1385 	struct dasd_device *device;
1386 	int hpf;
1387 
1388 	device = dasd_device_from_cdev(to_ccwdev(dev));
1389 	if (IS_ERR(device))
1390 		return -ENODEV;
1391 	if (!device->discipline || !device->discipline->hpf_enabled) {
1392 		dasd_put_device(device);
1393 		return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1394 	}
1395 	hpf = device->discipline->hpf_enabled(device);
1396 	dasd_put_device(device);
1397 	return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1398 }
1399 
1400 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1401 
dasd_reservation_policy_show(struct device * dev,struct device_attribute * attr,char * buf)1402 static ssize_t dasd_reservation_policy_show(struct device *dev,
1403 					    struct device_attribute *attr,
1404 					    char *buf)
1405 {
1406 	struct dasd_devmap *devmap;
1407 	int rc = 0;
1408 
1409 	devmap = dasd_find_busid(dev_name(dev));
1410 	if (IS_ERR(devmap)) {
1411 		rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1412 	} else {
1413 		spin_lock(&dasd_devmap_lock);
1414 		if (devmap->features & DASD_FEATURE_FAILONSLCK)
1415 			rc = snprintf(buf, PAGE_SIZE, "fail\n");
1416 		else
1417 			rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1418 		spin_unlock(&dasd_devmap_lock);
1419 	}
1420 	return rc;
1421 }
1422 
dasd_reservation_policy_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1423 static ssize_t dasd_reservation_policy_store(struct device *dev,
1424 					     struct device_attribute *attr,
1425 					     const char *buf, size_t count)
1426 {
1427 	struct ccw_device *cdev = to_ccwdev(dev);
1428 	int rc;
1429 
1430 	if (sysfs_streq("ignore", buf))
1431 		rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1432 	else if (sysfs_streq("fail", buf))
1433 		rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1434 	else
1435 		rc = -EINVAL;
1436 
1437 	return rc ? : count;
1438 }
1439 
1440 static DEVICE_ATTR(reservation_policy, 0644,
1441 		   dasd_reservation_policy_show, dasd_reservation_policy_store);
1442 
dasd_reservation_state_show(struct device * dev,struct device_attribute * attr,char * buf)1443 static ssize_t dasd_reservation_state_show(struct device *dev,
1444 					   struct device_attribute *attr,
1445 					   char *buf)
1446 {
1447 	struct dasd_device *device;
1448 	int rc = 0;
1449 
1450 	device = dasd_device_from_cdev(to_ccwdev(dev));
1451 	if (IS_ERR(device))
1452 		return snprintf(buf, PAGE_SIZE, "none\n");
1453 
1454 	if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1455 		rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1456 	else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1457 		rc = snprintf(buf, PAGE_SIZE, "lost\n");
1458 	else
1459 		rc = snprintf(buf, PAGE_SIZE, "none\n");
1460 	dasd_put_device(device);
1461 	return rc;
1462 }
1463 
dasd_reservation_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1464 static ssize_t dasd_reservation_state_store(struct device *dev,
1465 					    struct device_attribute *attr,
1466 					    const char *buf, size_t count)
1467 {
1468 	struct dasd_device *device;
1469 	int rc = 0;
1470 
1471 	device = dasd_device_from_cdev(to_ccwdev(dev));
1472 	if (IS_ERR(device))
1473 		return -ENODEV;
1474 	if (sysfs_streq("reset", buf))
1475 		clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1476 	else
1477 		rc = -EINVAL;
1478 	dasd_put_device(device);
1479 
1480 	if (rc)
1481 		return rc;
1482 	else
1483 		return count;
1484 }
1485 
1486 static DEVICE_ATTR(last_known_reservation_state, 0644,
1487 		   dasd_reservation_state_show, dasd_reservation_state_store);
1488 
dasd_pm_show(struct device * dev,struct device_attribute * attr,char * buf)1489 static ssize_t dasd_pm_show(struct device *dev,
1490 			      struct device_attribute *attr, char *buf)
1491 {
1492 	struct dasd_device *device;
1493 	u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1494 
1495 	device = dasd_device_from_cdev(to_ccwdev(dev));
1496 	if (IS_ERR(device))
1497 		return sprintf(buf, "0\n");
1498 
1499 	opm = dasd_path_get_opm(device);
1500 	nppm = dasd_path_get_nppm(device);
1501 	cablepm = dasd_path_get_cablepm(device);
1502 	cuirpm = dasd_path_get_cuirpm(device);
1503 	hpfpm = dasd_path_get_hpfpm(device);
1504 	ifccpm = dasd_path_get_ifccpm(device);
1505 	dasd_put_device(device);
1506 
1507 	return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1508 		       cablepm, cuirpm, hpfpm, ifccpm);
1509 }
1510 
1511 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1512 
1513 /*
1514  * threshold value for IFCC/CCC errors
1515  */
1516 static ssize_t
dasd_path_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)1517 dasd_path_threshold_show(struct device *dev,
1518 			  struct device_attribute *attr, char *buf)
1519 {
1520 	struct dasd_device *device;
1521 	int len;
1522 
1523 	device = dasd_device_from_cdev(to_ccwdev(dev));
1524 	if (IS_ERR(device))
1525 		return -ENODEV;
1526 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1527 	dasd_put_device(device);
1528 	return len;
1529 }
1530 
1531 static ssize_t
dasd_path_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1532 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1533 			   const char *buf, size_t count)
1534 {
1535 	struct dasd_device *device;
1536 	unsigned long flags;
1537 	unsigned long val;
1538 
1539 	device = dasd_device_from_cdev(to_ccwdev(dev));
1540 	if (IS_ERR(device))
1541 		return -ENODEV;
1542 
1543 	if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
1544 		dasd_put_device(device);
1545 		return -EINVAL;
1546 	}
1547 	spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1548 	device->path_thrhld = val;
1549 	spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1550 	dasd_put_device(device);
1551 	return count;
1552 }
1553 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1554 		   dasd_path_threshold_store);
1555 
1556 /*
1557  * configure if path is disabled after IFCC/CCC error threshold is
1558  * exceeded
1559  */
1560 static ssize_t
dasd_path_autodisable_show(struct device * dev,struct device_attribute * attr,char * buf)1561 dasd_path_autodisable_show(struct device *dev,
1562 				   struct device_attribute *attr, char *buf)
1563 {
1564 	struct dasd_devmap *devmap;
1565 	int flag;
1566 
1567 	devmap = dasd_find_busid(dev_name(dev));
1568 	if (!IS_ERR(devmap))
1569 		flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
1570 	else
1571 		flag = (DASD_FEATURE_DEFAULT &
1572 			DASD_FEATURE_PATH_AUTODISABLE) != 0;
1573 	return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n");
1574 }
1575 
1576 static ssize_t
dasd_path_autodisable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1577 dasd_path_autodisable_store(struct device *dev,
1578 				    struct device_attribute *attr,
1579 				    const char *buf, size_t count)
1580 {
1581 	unsigned int val;
1582 	int rc;
1583 
1584 	if (kstrtouint(buf, 0, &val) || val > 1)
1585 		return -EINVAL;
1586 
1587 	rc = dasd_set_feature(to_ccwdev(dev),
1588 			      DASD_FEATURE_PATH_AUTODISABLE, val);
1589 
1590 	return rc ? : count;
1591 }
1592 
1593 static DEVICE_ATTR(path_autodisable, 0644,
1594 		   dasd_path_autodisable_show,
1595 		   dasd_path_autodisable_store);
1596 /*
1597  * interval for IFCC/CCC checks
1598  * meaning time with no IFCC/CCC error before the error counter
1599  * gets reset
1600  */
1601 static ssize_t
dasd_path_interval_show(struct device * dev,struct device_attribute * attr,char * buf)1602 dasd_path_interval_show(struct device *dev,
1603 			struct device_attribute *attr, char *buf)
1604 {
1605 	struct dasd_device *device;
1606 	int len;
1607 
1608 	device = dasd_device_from_cdev(to_ccwdev(dev));
1609 	if (IS_ERR(device))
1610 		return -ENODEV;
1611 	len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1612 	dasd_put_device(device);
1613 	return len;
1614 }
1615 
1616 static ssize_t
dasd_path_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1617 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1618 	       const char *buf, size_t count)
1619 {
1620 	struct dasd_device *device;
1621 	unsigned long flags;
1622 	unsigned long val;
1623 
1624 	device = dasd_device_from_cdev(to_ccwdev(dev));
1625 	if (IS_ERR(device))
1626 		return -ENODEV;
1627 
1628 	if ((kstrtoul(buf, 10, &val) != 0) ||
1629 	    (val > DASD_INTERVAL_MAX) || val == 0) {
1630 		dasd_put_device(device);
1631 		return -EINVAL;
1632 	}
1633 	spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1634 	if (val)
1635 		device->path_interval = val;
1636 	spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1637 	dasd_put_device(device);
1638 	return count;
1639 }
1640 
1641 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1642 		   dasd_path_interval_store);
1643 
1644 
1645 static struct attribute * dasd_attrs[] = {
1646 	&dev_attr_readonly.attr,
1647 	&dev_attr_discipline.attr,
1648 	&dev_attr_status.attr,
1649 	&dev_attr_alias.attr,
1650 	&dev_attr_vendor.attr,
1651 	&dev_attr_uid.attr,
1652 	&dev_attr_use_diag.attr,
1653 	&dev_attr_raw_track_access.attr,
1654 	&dev_attr_eer_enabled.attr,
1655 	&dev_attr_erplog.attr,
1656 	&dev_attr_failfast.attr,
1657 	&dev_attr_expires.attr,
1658 	&dev_attr_retries.attr,
1659 	&dev_attr_timeout.attr,
1660 	&dev_attr_reservation_policy.attr,
1661 	&dev_attr_last_known_reservation_state.attr,
1662 	&dev_attr_safe_offline.attr,
1663 	&dev_attr_host_access_count.attr,
1664 	&dev_attr_path_masks.attr,
1665 	&dev_attr_path_threshold.attr,
1666 	&dev_attr_path_autodisable.attr,
1667 	&dev_attr_path_interval.attr,
1668 	&dev_attr_path_reset.attr,
1669 	&dev_attr_hpf.attr,
1670 	NULL,
1671 };
1672 
1673 static const struct attribute_group dasd_attr_group = {
1674 	.attrs = dasd_attrs,
1675 };
1676 
1677 /*
1678  * Return value of the specified feature.
1679  */
1680 int
dasd_get_feature(struct ccw_device * cdev,int feature)1681 dasd_get_feature(struct ccw_device *cdev, int feature)
1682 {
1683 	struct dasd_devmap *devmap;
1684 
1685 	devmap = dasd_find_busid(dev_name(&cdev->dev));
1686 	if (IS_ERR(devmap))
1687 		return PTR_ERR(devmap);
1688 
1689 	return ((devmap->features & feature) != 0);
1690 }
1691 
1692 /*
1693  * Set / reset given feature.
1694  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1695  */
1696 int
dasd_set_feature(struct ccw_device * cdev,int feature,int flag)1697 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1698 {
1699 	struct dasd_devmap *devmap;
1700 
1701 	devmap = dasd_devmap_from_cdev(cdev);
1702 	if (IS_ERR(devmap))
1703 		return PTR_ERR(devmap);
1704 
1705 	spin_lock(&dasd_devmap_lock);
1706 	if (flag)
1707 		devmap->features |= feature;
1708 	else
1709 		devmap->features &= ~feature;
1710 	if (devmap->device)
1711 		devmap->device->features = devmap->features;
1712 	spin_unlock(&dasd_devmap_lock);
1713 	return 0;
1714 }
1715 EXPORT_SYMBOL(dasd_set_feature);
1716 
1717 
1718 int
dasd_add_sysfs_files(struct ccw_device * cdev)1719 dasd_add_sysfs_files(struct ccw_device *cdev)
1720 {
1721 	return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1722 }
1723 
1724 void
dasd_remove_sysfs_files(struct ccw_device * cdev)1725 dasd_remove_sysfs_files(struct ccw_device *cdev)
1726 {
1727 	sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1728 }
1729 
1730 
1731 int
dasd_devmap_init(void)1732 dasd_devmap_init(void)
1733 {
1734 	int i;
1735 
1736 	/* Initialize devmap structures. */
1737 	dasd_max_devindex = 0;
1738 	for (i = 0; i < 256; i++)
1739 		INIT_LIST_HEAD(&dasd_hashlists[i]);
1740 	return 0;
1741 }
1742 
1743 void
dasd_devmap_exit(void)1744 dasd_devmap_exit(void)
1745 {
1746 	dasd_forget_ranges();
1747 }
1748