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[S390] subchannel lock conversion.
[linux-2.6/verdex.git] / drivers / s390 / cio / chsc.c
blobcbab8d2ce5cfd664b82fd6f189a0fbc9dfbbfb38
1 /*
2 * drivers/s390/cio/chsc.c
3 * S/390 common I/O routines -- channel subsystem call
4 *
5 * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
7 * Author(s): Ingo Adlung (adlung@de.ibm.com)
8 * Cornelia Huck (cornelia.huck@de.ibm.com)
9 * Arnd Bergmann (arndb@de.ibm.com)
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/init.h>
15 #include <linux/device.h>
16
17 #include <asm/cio.h>
18
19 #include "css.h"
20 #include "cio.h"
21 #include "cio_debug.h"
22 #include "ioasm.h"
23 #include "chsc.h"
24
25 static void *sei_page;
26
27 static int new_channel_path(int chpid);
28
29 static inline void
30 set_chp_logically_online(int chp, int onoff)
31 {
32 css[0]->chps[chp]->state = onoff;
33 }
34
35 static int
36 get_chp_status(int chp)
37 {
38 return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
39 }
40
41 void
42 chsc_validate_chpids(struct subchannel *sch)
43 {
44 int mask, chp;
45
46 for (chp = 0; chp <= 7; chp++) {
47 mask = 0x80 >> chp;
48 if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
49 /* disable using this path */
50 sch->opm &= ~mask;
51 }
52 }
53
54 void
55 chpid_is_actually_online(int chp)
56 {
57 int state;
58
59 state = get_chp_status(chp);
60 if (state < 0) {
61 need_rescan = 1;
62 queue_work(slow_path_wq, &slow_path_work);
63 } else
64 WARN_ON(!state);
65 }
66
67 /* FIXME: this is _always_ called for every subchannel. shouldn't we
68 * process more than one at a time? */
69 static int
70 chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
71 {
72 int ccode, j;
73
74 struct {
75 struct chsc_header request;
76 u16 reserved1a:10;
77 u16 ssid:2;
78 u16 reserved1b:4;
79 u16 f_sch; /* first subchannel */
80 u16 reserved2;
81 u16 l_sch; /* last subchannel */
82 u32 reserved3;
83 struct chsc_header response;
84 u32 reserved4;
85 u8 sch_valid : 1;
86 u8 dev_valid : 1;
87 u8 st : 3; /* subchannel type */
88 u8 zeroes : 3;
89 u8 unit_addr; /* unit address */
90 u16 devno; /* device number */
91 u8 path_mask;
92 u8 fla_valid_mask;
93 u16 sch; /* subchannel */
94 u8 chpid[8]; /* chpids 0-7 */
95 u16 fla[8]; /* full link addresses 0-7 */
96 } *ssd_area;
97
98 ssd_area = page;
99
100 ssd_area->request.length = 0x0010;
101 ssd_area->request.code = 0x0004;
102
103 ssd_area->ssid = sch->schid.ssid;
104 ssd_area->f_sch = sch->schid.sch_no;
105 ssd_area->l_sch = sch->schid.sch_no;
106
107 ccode = chsc(ssd_area);
108 if (ccode > 0) {
109 pr_debug("chsc returned with ccode = %d\n", ccode);
110 return (ccode == 3) ? -ENODEV : -EBUSY;
111 }
112
113 switch (ssd_area->response.code) {
114 case 0x0001: /* everything ok */
115 break;
116 case 0x0002:
117 CIO_CRW_EVENT(2, "Invalid command!\n");
118 return -EINVAL;
119 case 0x0003:
120 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
121 return -EINVAL;
122 case 0x0004:
123 CIO_CRW_EVENT(2, "Model does not provide ssd\n");
124 return -EOPNOTSUPP;
125 default:
126 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
127 ssd_area->response.code);
128 return -EIO;
129 }
130
131 /*
132 * ssd_area->st stores the type of the detected
133 * subchannel, with the following definitions:
134 *
135 * 0: I/O subchannel: All fields have meaning
136 * 1: CHSC subchannel: Only sch_val, st and sch
137 * have meaning
138 * 2: Message subchannel: All fields except unit_addr
139 * have meaning
140 * 3: ADM subchannel: Only sch_val, st and sch
141 * have meaning
142 *
143 * Other types are currently undefined.
144 */
145 if (ssd_area->st > 3) { /* uhm, that looks strange... */
146 CIO_CRW_EVENT(0, "Strange subchannel type %d"
147 " for sch 0.%x.%04x\n", ssd_area->st,
148 sch->schid.ssid, sch->schid.sch_no);
149 /*
150 * There may have been a new subchannel type defined in the
151 * time since this code was written; since we don't know which
152 * fields have meaning and what to do with it we just jump out
153 */
154 return 0;
155 } else {
156 const char *type[4] = {"I/O", "chsc", "message", "ADM"};
157 CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
158 sch->schid.ssid, sch->schid.sch_no,
159 type[ssd_area->st]);
160
161 sch->ssd_info.valid = 1;
162 sch->ssd_info.type = ssd_area->st;
163 }
164
165 if (ssd_area->st == 0 || ssd_area->st == 2) {
166 for (j = 0; j < 8; j++) {
167 if (!((0x80 >> j) & ssd_area->path_mask &
168 ssd_area->fla_valid_mask))
169 continue;
170 sch->ssd_info.chpid[j] = ssd_area->chpid[j];
171 sch->ssd_info.fla[j] = ssd_area->fla[j];
172 }
173 }
174 return 0;
175 }
176
177 int
178 css_get_ssd_info(struct subchannel *sch)
179 {
180 int ret;
181 void *page;
182
183 page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
184 if (!page)
185 return -ENOMEM;
186 spin_lock_irq(sch->lock);
187 ret = chsc_get_sch_desc_irq(sch, page);
188 if (ret) {
189 static int cio_chsc_err_msg;
190
191 if (!cio_chsc_err_msg) {
192 printk(KERN_ERR
193 "chsc_get_sch_descriptions:"
194 " Error %d while doing chsc; "
195 "processing some machine checks may "
196 "not work\n", ret);
197 cio_chsc_err_msg = 1;
198 }
199 }
200 spin_unlock_irq(sch->lock);
201 free_page((unsigned long)page);
202 if (!ret) {
203 int j, chpid, mask;
204 /* Allocate channel path structures, if needed. */
205 for (j = 0; j < 8; j++) {
206 mask = 0x80 >> j;
207 chpid = sch->ssd_info.chpid[j];
208 if ((sch->schib.pmcw.pim & mask) &&
209 (get_chp_status(chpid) < 0))
210 new_channel_path(chpid);
211 }
212 }
213 return ret;
214 }
215
216 static int
217 s390_subchannel_remove_chpid(struct device *dev, void *data)
218 {
219 int j;
220 int mask;
221 struct subchannel *sch;
222 struct channel_path *chpid;
223 struct schib schib;
224
225 sch = to_subchannel(dev);
226 chpid = data;
227 for (j = 0; j < 8; j++) {
228 mask = 0x80 >> j;
229 if ((sch->schib.pmcw.pim & mask) &&
230 (sch->schib.pmcw.chpid[j] == chpid->id))
231 break;
232 }
233 if (j >= 8)
234 return 0;
235
236 spin_lock_irq(sch->lock);
237
238 stsch(sch->schid, &schib);
239 if (!schib.pmcw.dnv)
240 goto out_unreg;
241 memcpy(&sch->schib, &schib, sizeof(struct schib));
242 /* Check for single path devices. */
243 if (sch->schib.pmcw.pim == 0x80)
244 goto out_unreg;
245
246 if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
247 (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
248 (sch->schib.pmcw.lpum == mask)) {
249 int cc;
250
251 cc = cio_clear(sch);
252 if (cc == -ENODEV)
253 goto out_unreg;
254 /* Request retry of internal operation. */
255 device_set_intretry(sch);
256 /* Call handler. */
257 if (sch->driver && sch->driver->termination)
258 sch->driver->termination(&sch->dev);
259 goto out_unlock;
260 }
261
262 /* trigger path verification. */
263 if (sch->driver && sch->driver->verify)
264 sch->driver->verify(&sch->dev);
265 else if (sch->lpm == mask)
266 goto out_unreg;
267 out_unlock:
268 spin_unlock_irq(sch->lock);
269 return 0;
270 out_unreg:
271 spin_unlock_irq(sch->lock);
272 sch->lpm = 0;
273 if (css_enqueue_subchannel_slow(sch->schid)) {
274 css_clear_subchannel_slow_list();
275 need_rescan = 1;
276 }
277 return 0;
278 }
279
280 static inline void
281 s390_set_chpid_offline( __u8 chpid)
282 {
283 char dbf_txt[15];
284 struct device *dev;
285
286 sprintf(dbf_txt, "chpr%x", chpid);
287 CIO_TRACE_EVENT(2, dbf_txt);
288
289 if (get_chp_status(chpid) <= 0)
290 return;
291 dev = get_device(&css[0]->chps[chpid]->dev);
292 bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
293 s390_subchannel_remove_chpid);
294
295 if (need_rescan || css_slow_subchannels_exist())
296 queue_work(slow_path_wq, &slow_path_work);
297 put_device(dev);
298 }
299
300 struct res_acc_data {
301 struct channel_path *chp;
302 u32 fla_mask;
303 u16 fla;
304 };
305
306 static int
307 s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
308 {
309 int found;
310 int chp;
311 int ccode;
312
313 found = 0;
314 for (chp = 0; chp <= 7; chp++)
315 /*
316 * check if chpid is in information updated by ssd
317 */
318 if (sch->ssd_info.valid &&
319 sch->ssd_info.chpid[chp] == res_data->chp->id &&
320 (sch->ssd_info.fla[chp] & res_data->fla_mask)
321 == res_data->fla) {
322 found = 1;
323 break;
324 }
325
326 if (found == 0)
327 return 0;
328
329 /*
330 * Do a stsch to update our subchannel structure with the
331 * new path information and eventually check for logically
332 * offline chpids.
333 */
334 ccode = stsch(sch->schid, &sch->schib);
335 if (ccode > 0)
336 return 0;
337
338 return 0x80 >> chp;
339 }
340
341 static inline int
342 s390_process_res_acc_new_sch(struct subchannel_id schid)
343 {
344 struct schib schib;
345 int ret;
346 /*
347 * We don't know the device yet, but since a path
348 * may be available now to the device we'll have
349 * to do recognition again.
350 * Since we don't have any idea about which chpid
351 * that beast may be on we'll have to do a stsch
352 * on all devices, grr...
353 */
354 if (stsch_err(schid, &schib))
355 /* We're through */
356 return need_rescan ? -EAGAIN : -ENXIO;
357
358 /* Put it on the slow path. */
359 ret = css_enqueue_subchannel_slow(schid);
360 if (ret) {
361 css_clear_subchannel_slow_list();
362 need_rescan = 1;
363 return -EAGAIN;
364 }
365 return 0;
366 }
367
368 static int
369 __s390_process_res_acc(struct subchannel_id schid, void *data)
370 {
371 int chp_mask, old_lpm;
372 struct res_acc_data *res_data;
373 struct subchannel *sch;
374
375 res_data = data;
376 sch = get_subchannel_by_schid(schid);
377 if (!sch)
378 /* Check if a subchannel is newly available. */
379 return s390_process_res_acc_new_sch(schid);
380
381 spin_lock_irq(sch->lock);
382
383 chp_mask = s390_process_res_acc_sch(res_data, sch);
384
385 if (chp_mask == 0) {
386 spin_unlock_irq(sch->lock);
387 put_device(&sch->dev);
388 return 0;
389 }
390 old_lpm = sch->lpm;
391 sch->lpm = ((sch->schib.pmcw.pim &
392 sch->schib.pmcw.pam &
393 sch->schib.pmcw.pom)
394 | chp_mask) & sch->opm;
395 if (!old_lpm && sch->lpm)
396 device_trigger_reprobe(sch);
397 else if (sch->driver && sch->driver->verify)
398 sch->driver->verify(&sch->dev);
399
400 spin_unlock_irq(sch->lock);
401 put_device(&sch->dev);
402 return 0;
403 }
404
405
406 static int
407 s390_process_res_acc (struct res_acc_data *res_data)
408 {
409 int rc;
410 char dbf_txt[15];
411
412 sprintf(dbf_txt, "accpr%x", res_data->chp->id);
413 CIO_TRACE_EVENT( 2, dbf_txt);
414 if (res_data->fla != 0) {
415 sprintf(dbf_txt, "fla%x", res_data->fla);
416 CIO_TRACE_EVENT( 2, dbf_txt);
417 }
418
419 /*
420 * I/O resources may have become accessible.
421 * Scan through all subchannels that may be concerned and
422 * do a validation on those.
423 * The more information we have (info), the less scanning
424 * will we have to do.
425 */
426 rc = for_each_subchannel(__s390_process_res_acc, res_data);
427 if (css_slow_subchannels_exist())
428 rc = -EAGAIN;
429 else if (rc != -EAGAIN)
430 rc = 0;
431 return rc;
432 }
433
434 static int
435 __get_chpid_from_lir(void *data)
436 {
437 struct lir {
438 u8 iq;
439 u8 ic;
440 u16 sci;
441 /* incident-node descriptor */
442 u32 indesc[28];
443 /* attached-node descriptor */
444 u32 andesc[28];
445 /* incident-specific information */
446 u32 isinfo[28];
447 } *lir;
448
449 lir = data;
450 if (!(lir->iq&0x80))
451 /* NULL link incident record */
452 return -EINVAL;
453 if (!(lir->indesc[0]&0xc0000000))
454 /* node descriptor not valid */
455 return -EINVAL;
456 if (!(lir->indesc[0]&0x10000000))
457 /* don't handle device-type nodes - FIXME */
458 return -EINVAL;
459 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
460
461 return (u16) (lir->indesc[0]&0x000000ff);
462 }
463
464 int
465 chsc_process_crw(void)
466 {
467 int chpid, ret;
468 struct res_acc_data res_data;
469 struct {
470 struct chsc_header request;
471 u32 reserved1;
472 u32 reserved2;
473 u32 reserved3;
474 struct chsc_header response;
475 u32 reserved4;
476 u8 flags;
477 u8 vf; /* validity flags */
478 u8 rs; /* reporting source */
479 u8 cc; /* content code */
480 u16 fla; /* full link address */
481 u16 rsid; /* reporting source id */
482 u32 reserved5;
483 u32 reserved6;
484 u32 ccdf[96]; /* content-code dependent field */
485 /* ccdf has to be big enough for a link-incident record */
486 } *sei_area;
487
488 if (!sei_page)
489 return 0;
490 /*
491 * build the chsc request block for store event information
492 * and do the call
493 * This function is only called by the machine check handler thread,
494 * so we don't need locking for the sei_page.
495 */
496 sei_area = sei_page;
497
498 CIO_TRACE_EVENT( 2, "prcss");
499 ret = 0;
500 do {
501 int ccode, status;
502 struct device *dev;
503 memset(sei_area, 0, sizeof(*sei_area));
504 memset(&res_data, 0, sizeof(struct res_acc_data));
505 sei_area->request.length = 0x0010;
506 sei_area->request.code = 0x000e;
507
508 ccode = chsc(sei_area);
509 if (ccode > 0)
510 return 0;
511
512 switch (sei_area->response.code) {
513 /* for debug purposes, check for problems */
514 case 0x0001:
515 CIO_CRW_EVENT(4, "chsc_process_crw: event information "
516 "successfully stored\n");
517 break; /* everything ok */
518 case 0x0002:
519 CIO_CRW_EVENT(2,
520 "chsc_process_crw: invalid command!\n");
521 return 0;
522 case 0x0003:
523 CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
524 "request block!\n");
525 return 0;
526 case 0x0005:
527 CIO_CRW_EVENT(2, "chsc_process_crw: no event "
528 "information stored\n");
529 return 0;
530 default:
531 CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
532 sei_area->response.code);
533 return 0;
534 }
535
536 /* Check if we might have lost some information. */
537 if (sei_area->flags & 0x40)
538 CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
539 "has been lost due to overflow!\n");
540
541 if (sei_area->rs != 4) {
542 CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
543 "(%04X) isn't a chpid!\n",
544 sei_area->rsid);
545 continue;
546 }
547
548 /* which kind of information was stored? */
549 switch (sei_area->cc) {
550 case 1: /* link incident*/
551 CIO_CRW_EVENT(4, "chsc_process_crw: "
552 "channel subsystem reports link incident,"
553 " reporting source is chpid %x\n",
554 sei_area->rsid);
555 chpid = __get_chpid_from_lir(sei_area->ccdf);
556 if (chpid < 0)
557 CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
558 __FUNCTION__);
559 else
560 s390_set_chpid_offline(chpid);
561 break;
562
563 case 2: /* i/o resource accessibiliy */
564 CIO_CRW_EVENT(4, "chsc_process_crw: "
565 "channel subsystem reports some I/O "
566 "devices may have become accessible\n");
567 pr_debug("Data received after sei: \n");
568 pr_debug("Validity flags: %x\n", sei_area->vf);
569
570 /* allocate a new channel path structure, if needed */
571 status = get_chp_status(sei_area->rsid);
572 if (status < 0)
573 new_channel_path(sei_area->rsid);
574 else if (!status)
575 break;
576 dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
577 res_data.chp = to_channelpath(dev);
578 pr_debug("chpid: %x", sei_area->rsid);
579 if ((sei_area->vf & 0xc0) != 0) {
580 res_data.fla = sei_area->fla;
581 if ((sei_area->vf & 0xc0) == 0xc0) {
582 pr_debug(" full link addr: %x",
583 sei_area->fla);
584 res_data.fla_mask = 0xffff;
585 } else {
586 pr_debug(" link addr: %x",
587 sei_area->fla);
588 res_data.fla_mask = 0xff00;
589 }
590 }
591 ret = s390_process_res_acc(&res_data);
592 pr_debug("\n\n");
593 put_device(dev);
594 break;
595
596 default: /* other stuff */
597 CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
598 sei_area->cc);
599 break;
600 }
601 } while (sei_area->flags & 0x80);
602 return ret;
603 }
604
605 static inline int
606 __chp_add_new_sch(struct subchannel_id schid)
607 {
608 struct schib schib;
609 int ret;
610
611 if (stsch(schid, &schib))
612 /* We're through */
613 return need_rescan ? -EAGAIN : -ENXIO;
614
615 /* Put it on the slow path. */
616 ret = css_enqueue_subchannel_slow(schid);
617 if (ret) {
618 css_clear_subchannel_slow_list();
619 need_rescan = 1;
620 return -EAGAIN;
621 }
622 return 0;
623 }
624
625
626 static int
627 __chp_add(struct subchannel_id schid, void *data)
628 {
629 int i, mask;
630 struct channel_path *chp;
631 struct subchannel *sch;
632
633 chp = data;
634 sch = get_subchannel_by_schid(schid);
635 if (!sch)
636 /* Check if the subchannel is now available. */
637 return __chp_add_new_sch(schid);
638 spin_lock_irq(sch->lock);
639 for (i=0; i<8; i++) {
640 mask = 0x80 >> i;
641 if ((sch->schib.pmcw.pim & mask) &&
642 (sch->schib.pmcw.chpid[i] == chp->id)) {
643 if (stsch(sch->schid, &sch->schib) != 0) {
644 /* Endgame. */
645 spin_unlock_irq(sch->lock);
646 return -ENXIO;
647 }
648 break;
649 }
650 }
651 if (i==8) {
652 spin_unlock_irq(sch->lock);
653 return 0;
654 }
655 sch->lpm = ((sch->schib.pmcw.pim &
656 sch->schib.pmcw.pam &
657 sch->schib.pmcw.pom)
658 | mask) & sch->opm;
659
660 if (sch->driver && sch->driver->verify)
661 sch->driver->verify(&sch->dev);
662
663 spin_unlock_irq(sch->lock);
664 put_device(&sch->dev);
665 return 0;
666 }
667
668 static int
669 chp_add(int chpid)
670 {
671 int rc;
672 char dbf_txt[15];
673 struct device *dev;
674
675 if (!get_chp_status(chpid))
676 return 0; /* no need to do the rest */
677
678 sprintf(dbf_txt, "cadd%x", chpid);
679 CIO_TRACE_EVENT(2, dbf_txt);
680
681 dev = get_device(&css[0]->chps[chpid]->dev);
682 rc = for_each_subchannel(__chp_add, to_channelpath(dev));
683 if (css_slow_subchannels_exist())
684 rc = -EAGAIN;
685 if (rc != -EAGAIN)
686 rc = 0;
687 put_device(dev);
688 return rc;
689 }
690
691 /*
692 * Handling of crw machine checks with channel path source.
693 */
694 int
695 chp_process_crw(int chpid, int on)
696 {
697 if (on == 0) {
698 /* Path has gone. We use the link incident routine.*/
699 s390_set_chpid_offline(chpid);
700 return 0; /* De-register is async anyway. */
701 }
702 /*
703 * Path has come. Allocate a new channel path structure,
704 * if needed.
705 */
706 if (get_chp_status(chpid) < 0)
707 new_channel_path(chpid);
708 /* Avoid the extra overhead in process_rec_acc. */
709 return chp_add(chpid);
710 }
711
712 static inline int check_for_io_on_path(struct subchannel *sch, int index)
713 {
714 int cc;
715
716 cc = stsch(sch->schid, &sch->schib);
717 if (cc)
718 return 0;
719 if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index))
720 return 1;
721 return 0;
722 }
723
724 static void terminate_internal_io(struct subchannel *sch)
725 {
726 if (cio_clear(sch)) {
727 /* Recheck device in case clear failed. */
728 sch->lpm = 0;
729 if (device_trigger_verify(sch) != 0) {
730 if(css_enqueue_subchannel_slow(sch->schid)) {
731 css_clear_subchannel_slow_list();
732 need_rescan = 1;
733 }
734 }
735 return;
736 }
737 /* Request retry of internal operation. */
738 device_set_intretry(sch);
739 /* Call handler. */
740 if (sch->driver && sch->driver->termination)
741 sch->driver->termination(&sch->dev);
742 }
743
744 static inline void
745 __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
746 {
747 int chp, old_lpm;
748 unsigned long flags;
749
750 if (!sch->ssd_info.valid)
751 return;
752
753 spin_lock_irqsave(sch->lock, flags);
754 old_lpm = sch->lpm;
755 for (chp = 0; chp < 8; chp++) {
756 if (sch->ssd_info.chpid[chp] != chpid)
757 continue;
758
759 if (on) {
760 sch->opm |= (0x80 >> chp);
761 sch->lpm |= (0x80 >> chp);
762 if (!old_lpm)
763 device_trigger_reprobe(sch);
764 else if (sch->driver && sch->driver->verify)
765 sch->driver->verify(&sch->dev);
766 break;
767 }
768 sch->opm &= ~(0x80 >> chp);
769 sch->lpm &= ~(0x80 >> chp);
770 if (check_for_io_on_path(sch, chp)) {
771 if (device_is_online(sch))
772 /* Path verification is done after killing. */
773 device_kill_io(sch);
774 else
775 /* Kill and retry internal I/O. */
776 terminate_internal_io(sch);
777 } else if (!sch->lpm) {
778 if (device_trigger_verify(sch) != 0) {
779 if (css_enqueue_subchannel_slow(sch->schid)) {
780 css_clear_subchannel_slow_list();
781 need_rescan = 1;
782 }
783 }
784 } else if (sch->driver && sch->driver->verify)
785 sch->driver->verify(&sch->dev);
786 break;
787 }
788 spin_unlock_irqrestore(sch->lock, flags);
789 }
790
791 static int
792 s390_subchannel_vary_chpid_off(struct device *dev, void *data)
793 {
794 struct subchannel *sch;
795 __u8 *chpid;
796
797 sch = to_subchannel(dev);
798 chpid = data;
799
800 __s390_subchannel_vary_chpid(sch, *chpid, 0);
801 return 0;
802 }
803
804 static int
805 s390_subchannel_vary_chpid_on(struct device *dev, void *data)
806 {
807 struct subchannel *sch;
808 __u8 *chpid;
809
810 sch = to_subchannel(dev);
811 chpid = data;
812
813 __s390_subchannel_vary_chpid(sch, *chpid, 1);
814 return 0;
815 }
816
817 static int
818 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
819 {
820 struct schib schib;
821 struct subchannel *sch;
822
823 sch = get_subchannel_by_schid(schid);
824 if (sch) {
825 put_device(&sch->dev);
826 return 0;
827 }
828 if (stsch_err(schid, &schib))
829 /* We're through */
830 return -ENXIO;
831 /* Put it on the slow path. */
832 if (css_enqueue_subchannel_slow(schid)) {
833 css_clear_subchannel_slow_list();
834 need_rescan = 1;
835 return -EAGAIN;
836 }
837 return 0;
838 }
839
840 /*
841 * Function: s390_vary_chpid
842 * Varies the specified chpid online or offline
843 */
844 static int
845 s390_vary_chpid( __u8 chpid, int on)
846 {
847 char dbf_text[15];
848 int status;
849
850 sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
851 CIO_TRACE_EVENT( 2, dbf_text);
852
853 status = get_chp_status(chpid);
854 if (status < 0) {
855 printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
856 return -EINVAL;
857 }
858
859 if (!on && !status) {
860 printk(KERN_ERR "chpid %x is already offline\n", chpid);
861 return -EINVAL;
862 }
863
864 set_chp_logically_online(chpid, on);
865
866 /*
867 * Redo PathVerification on the devices the chpid connects to
868 */
869
870 bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
871 s390_subchannel_vary_chpid_on :
872 s390_subchannel_vary_chpid_off);
873 if (on)
874 /* Scan for new devices on varied on path. */
875 for_each_subchannel(__s390_vary_chpid_on, NULL);
876 if (need_rescan || css_slow_subchannels_exist())
877 queue_work(slow_path_wq, &slow_path_work);
878 return 0;
879 }
880
881 /*
882 * Channel measurement related functions
883 */
884 static ssize_t
885 chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
886 size_t count)
887 {
888 struct channel_path *chp;
889 unsigned int size;
890
891 chp = to_channelpath(container_of(kobj, struct device, kobj));
892 if (!chp->cmg_chars)
893 return 0;
894
895 size = sizeof(struct cmg_chars);
896
897 if (off > size)
898 return 0;
899 if (off + count > size)
900 count = size - off;
901 memcpy(buf, chp->cmg_chars + off, count);
902 return count;
903 }
904
905 static struct bin_attribute chp_measurement_chars_attr = {
906 .attr = {
907 .name = "measurement_chars",
908 .mode = S_IRUSR,
909 .owner = THIS_MODULE,
910 },
911 .size = sizeof(struct cmg_chars),
912 .read = chp_measurement_chars_read,
913 };
914
915 static void
916 chp_measurement_copy_block(struct cmg_entry *buf,
917 struct channel_subsystem *css, int chpid)
918 {
919 void *area;
920 struct cmg_entry *entry, reference_buf;
921 int idx;
922
923 if (chpid < 128) {
924 area = css->cub_addr1;
925 idx = chpid;
926 } else {
927 area = css->cub_addr2;
928 idx = chpid - 128;
929 }
930 entry = area + (idx * sizeof(struct cmg_entry));
931 do {
932 memcpy(buf, entry, sizeof(*entry));
933 memcpy(&reference_buf, entry, sizeof(*entry));
934 } while (reference_buf.values[0] != buf->values[0]);
935 }
936
937 static ssize_t
938 chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
939 {
940 struct channel_path *chp;
941 struct channel_subsystem *css;
942 unsigned int size;
943
944 chp = to_channelpath(container_of(kobj, struct device, kobj));
945 css = to_css(chp->dev.parent);
946
947 size = sizeof(struct cmg_entry);
948
949 /* Only allow single reads. */
950 if (off || count < size)
951 return 0;
952 chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
953 count = size;
954 return count;
955 }
956
957 static struct bin_attribute chp_measurement_attr = {
958 .attr = {
959 .name = "measurement",
960 .mode = S_IRUSR,
961 .owner = THIS_MODULE,
962 },
963 .size = sizeof(struct cmg_entry),
964 .read = chp_measurement_read,
965 };
966
967 static void
968 chsc_remove_chp_cmg_attr(struct channel_path *chp)
969 {
970 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr);
971 sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr);
972 }
973
974 static int
975 chsc_add_chp_cmg_attr(struct channel_path *chp)
976 {
977 int ret;
978
979 ret = sysfs_create_bin_file(&chp->dev.kobj,
980 &chp_measurement_chars_attr);
981 if (ret)
982 return ret;
983 ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr);
984 if (ret)
985 sysfs_remove_bin_file(&chp->dev.kobj,
986 &chp_measurement_chars_attr);
987 return ret;
988 }
989
990 static void
991 chsc_remove_cmg_attr(struct channel_subsystem *css)
992 {
993 int i;
994
995 for (i = 0; i <= __MAX_CHPID; i++) {
996 if (!css->chps[i])
997 continue;
998 chsc_remove_chp_cmg_attr(css->chps[i]);
999 }
1000 }
1001
1002 static int
1003 chsc_add_cmg_attr(struct channel_subsystem *css)
1004 {
1005 int i, ret;
1006
1007 ret = 0;
1008 for (i = 0; i <= __MAX_CHPID; i++) {
1009 if (!css->chps[i])
1010 continue;
1011 ret = chsc_add_chp_cmg_attr(css->chps[i]);
1012 if (ret)
1013 goto cleanup;
1014 }
1015 return ret;
1016 cleanup:
1017 for (--i; i >= 0; i--) {
1018 if (!css->chps[i])
1019 continue;
1020 chsc_remove_chp_cmg_attr(css->chps[i]);
1021 }
1022 return ret;
1023 }
1024
1025
1026 static int
1027 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
1028 {
1029 struct {
1030 struct chsc_header request;
1031 u32 operation_code : 2;
1032 u32 : 30;
1033 u32 key : 4;
1034 u32 : 28;
1035 u32 zeroes1;
1036 u32 cub_addr1;
1037 u32 zeroes2;
1038 u32 cub_addr2;
1039 u32 reserved[13];
1040 struct chsc_header response;
1041 u32 status : 8;
1042 u32 : 4;
1043 u32 fmt : 4;
1044 u32 : 16;
1045 } *secm_area;
1046 int ret, ccode;
1047
1048 secm_area = page;
1049 secm_area->request.length = 0x0050;
1050 secm_area->request.code = 0x0016;
1051
1052 secm_area->key = PAGE_DEFAULT_KEY;
1053 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
1054 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
1055
1056 secm_area->operation_code = enable ? 0 : 1;
1057
1058 ccode = chsc(secm_area);
1059 if (ccode > 0)
1060 return (ccode == 3) ? -ENODEV : -EBUSY;
1061
1062 switch (secm_area->response.code) {
1063 case 0x0001: /* Success. */
1064 ret = 0;
1065 break;
1066 case 0x0003: /* Invalid block. */
1067 case 0x0007: /* Invalid format. */
1068 case 0x0008: /* Other invalid block. */
1069 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1070 ret = -EINVAL;
1071 break;
1072 case 0x0004: /* Command not provided in model. */
1073 CIO_CRW_EVENT(2, "Model does not provide secm\n");
1074 ret = -EOPNOTSUPP;
1075 break;
1076 case 0x0102: /* cub adresses incorrect */
1077 CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n");
1078 ret = -EINVAL;
1079 break;
1080 case 0x0103: /* key error */
1081 CIO_CRW_EVENT(2, "Access key error in secm\n");
1082 ret = -EINVAL;
1083 break;
1084 case 0x0105: /* error while starting */
1085 CIO_CRW_EVENT(2, "Error while starting channel measurement\n");
1086 ret = -EIO;
1087 break;
1088 default:
1089 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1090 secm_area->response.code);
1091 ret = -EIO;
1092 }
1093 return ret;
1094 }
1095
1096 int
1097 chsc_secm(struct channel_subsystem *css, int enable)
1098 {
1099 void *secm_area;
1100 int ret;
1101
1102 secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1103 if (!secm_area)
1104 return -ENOMEM;
1105
1106 mutex_lock(&css->mutex);
1107 if (enable && !css->cm_enabled) {
1108 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1109 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1110 if (!css->cub_addr1 || !css->cub_addr2) {
1111 free_page((unsigned long)css->cub_addr1);
1112 free_page((unsigned long)css->cub_addr2);
1113 free_page((unsigned long)secm_area);
1114 mutex_unlock(&css->mutex);
1115 return -ENOMEM;
1116 }
1117 }
1118 ret = __chsc_do_secm(css, enable, secm_area);
1119 if (!ret) {
1120 css->cm_enabled = enable;
1121 if (css->cm_enabled) {
1122 ret = chsc_add_cmg_attr(css);
1123 if (ret) {
1124 memset(secm_area, 0, PAGE_SIZE);
1125 __chsc_do_secm(css, 0, secm_area);
1126 css->cm_enabled = 0;
1127 }
1128 } else
1129 chsc_remove_cmg_attr(css);
1130 }
1131 if (enable && !css->cm_enabled) {
1132 free_page((unsigned long)css->cub_addr1);
1133 free_page((unsigned long)css->cub_addr2);
1134 }
1135 mutex_unlock(&css->mutex);
1136 free_page((unsigned long)secm_area);
1137 return ret;
1138 }
1139
1140 /*
1141 * Files for the channel path entries.
1142 */
1143 static ssize_t
1144 chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
1145 {
1146 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1147
1148 if (!chp)
1149 return 0;
1150 return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
1151 sprintf(buf, "offline\n"));
1152 }
1153
1154 static ssize_t
1155 chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1156 {
1157 struct channel_path *cp = container_of(dev, struct channel_path, dev);
1158 char cmd[10];
1159 int num_args;
1160 int error;
1161
1162 num_args = sscanf(buf, "%5s", cmd);
1163 if (!num_args)
1164 return count;
1165
1166 if (!strnicmp(cmd, "on", 2))
1167 error = s390_vary_chpid(cp->id, 1);
1168 else if (!strnicmp(cmd, "off", 3))
1169 error = s390_vary_chpid(cp->id, 0);
1170 else
1171 error = -EINVAL;
1172
1173 return error < 0 ? error : count;
1174
1175 }
1176
1177 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
1178
1179 static ssize_t
1180 chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1181 {
1182 struct channel_path *chp = container_of(dev, struct channel_path, dev);
1183
1184 if (!chp)
1185 return 0;
1186 return sprintf(buf, "%x\n", chp->desc.desc);
1187 }
1188
1189 static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
1190
1191 static ssize_t
1192 chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf)
1193 {
1194 struct channel_path *chp = to_channelpath(dev);
1195
1196 if (!chp)
1197 return 0;
1198 if (chp->cmg == -1) /* channel measurements not available */
1199 return sprintf(buf, "unknown\n");
1200 return sprintf(buf, "%x\n", chp->cmg);
1201 }
1202
1203 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
1204
1205 static ssize_t
1206 chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
1207 {
1208 struct channel_path *chp = to_channelpath(dev);
1209
1210 if (!chp)
1211 return 0;
1212 if (chp->shared == -1) /* channel measurements not available */
1213 return sprintf(buf, "unknown\n");
1214 return sprintf(buf, "%x\n", chp->shared);
1215 }
1216
1217 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
1218
1219 static struct attribute * chp_attrs[] = {
1220 &dev_attr_status.attr,
1221 &dev_attr_type.attr,
1222 &dev_attr_cmg.attr,
1223 &dev_attr_shared.attr,
1224 NULL,
1225 };
1226
1227 static struct attribute_group chp_attr_group = {
1228 .attrs = chp_attrs,
1229 };
1230
1231 static void
1232 chp_release(struct device *dev)
1233 {
1234 struct channel_path *cp;
1235
1236 cp = container_of(dev, struct channel_path, dev);
1237 kfree(cp);
1238 }
1239
1240 static int
1241 chsc_determine_channel_path_description(int chpid,
1242 struct channel_path_desc *desc)
1243 {
1244 int ccode, ret;
1245
1246 struct {
1247 struct chsc_header request;
1248 u32 : 24;
1249 u32 first_chpid : 8;
1250 u32 : 24;
1251 u32 last_chpid : 8;
1252 u32 zeroes1;
1253 struct chsc_header response;
1254 u32 zeroes2;
1255 struct channel_path_desc desc;
1256 } *scpd_area;
1257
1258 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1259 if (!scpd_area)
1260 return -ENOMEM;
1261
1262 scpd_area->request.length = 0x0010;
1263 scpd_area->request.code = 0x0002;
1264
1265 scpd_area->first_chpid = chpid;
1266 scpd_area->last_chpid = chpid;
1267
1268 ccode = chsc(scpd_area);
1269 if (ccode > 0) {
1270 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1271 goto out;
1272 }
1273
1274 switch (scpd_area->response.code) {
1275 case 0x0001: /* Success. */
1276 memcpy(desc, &scpd_area->desc,
1277 sizeof(struct channel_path_desc));
1278 ret = 0;
1279 break;
1280 case 0x0003: /* Invalid block. */
1281 case 0x0007: /* Invalid format. */
1282 case 0x0008: /* Other invalid block. */
1283 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1284 ret = -EINVAL;
1285 break;
1286 case 0x0004: /* Command not provided in model. */
1287 CIO_CRW_EVENT(2, "Model does not provide scpd\n");
1288 ret = -EOPNOTSUPP;
1289 break;
1290 default:
1291 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1292 scpd_area->response.code);
1293 ret = -EIO;
1294 }
1295 out:
1296 free_page((unsigned long)scpd_area);
1297 return ret;
1298 }
1299
1300 static void
1301 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1302 struct cmg_chars *chars)
1303 {
1304 switch (chp->cmg) {
1305 case 2:
1306 case 3:
1307 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
1308 GFP_KERNEL);
1309 if (chp->cmg_chars) {
1310 int i, mask;
1311 struct cmg_chars *cmg_chars;
1312
1313 cmg_chars = chp->cmg_chars;
1314 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1315 mask = 0x80 >> (i + 3);
1316 if (cmcv & mask)
1317 cmg_chars->values[i] = chars->values[i];
1318 else
1319 cmg_chars->values[i] = 0;
1320 }
1321 }
1322 break;
1323 default:
1324 /* No cmg-dependent data. */
1325 break;
1326 }
1327 }
1328
1329 static int
1330 chsc_get_channel_measurement_chars(struct channel_path *chp)
1331 {
1332 int ccode, ret;
1333
1334 struct {
1335 struct chsc_header request;
1336 u32 : 24;
1337 u32 first_chpid : 8;
1338 u32 : 24;
1339 u32 last_chpid : 8;
1340 u32 zeroes1;
1341 struct chsc_header response;
1342 u32 zeroes2;
1343 u32 not_valid : 1;
1344 u32 shared : 1;
1345 u32 : 22;
1346 u32 chpid : 8;
1347 u32 cmcv : 5;
1348 u32 : 11;
1349 u32 cmgq : 8;
1350 u32 cmg : 8;
1351 u32 zeroes3;
1352 u32 data[NR_MEASUREMENT_CHARS];
1353 } *scmc_area;
1354
1355 scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1356 if (!scmc_area)
1357 return -ENOMEM;
1358
1359 scmc_area->request.length = 0x0010;
1360 scmc_area->request.code = 0x0022;
1361
1362 scmc_area->first_chpid = chp->id;
1363 scmc_area->last_chpid = chp->id;
1364
1365 ccode = chsc(scmc_area);
1366 if (ccode > 0) {
1367 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1368 goto out;
1369 }
1370
1371 switch (scmc_area->response.code) {
1372 case 0x0001: /* Success. */
1373 if (!scmc_area->not_valid) {
1374 chp->cmg = scmc_area->cmg;
1375 chp->shared = scmc_area->shared;
1376 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1377 (struct cmg_chars *)
1378 &scmc_area->data);
1379 } else {
1380 chp->cmg = -1;
1381 chp->shared = -1;
1382 }
1383 ret = 0;
1384 break;
1385 case 0x0003: /* Invalid block. */
1386 case 0x0007: /* Invalid format. */
1387 case 0x0008: /* Invalid bit combination. */
1388 CIO_CRW_EVENT(2, "Error in chsc request block!\n");
1389 ret = -EINVAL;
1390 break;
1391 case 0x0004: /* Command not provided. */
1392 CIO_CRW_EVENT(2, "Model does not provide scmc\n");
1393 ret = -EOPNOTSUPP;
1394 break;
1395 default:
1396 CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
1397 scmc_area->response.code);
1398 ret = -EIO;
1399 }
1400 out:
1401 free_page((unsigned long)scmc_area);
1402 return ret;
1403 }
1404
1405 /*
1406 * Entries for chpids on the system bus.
1407 * This replaces /proc/chpids.
1408 */
1409 static int
1410 new_channel_path(int chpid)
1411 {
1412 struct channel_path *chp;
1413 int ret;
1414
1415 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
1416 if (!chp)
1417 return -ENOMEM;
1418
1419 /* fill in status, etc. */
1420 chp->id = chpid;
1421 chp->state = 1;
1422 chp->dev.parent = &css[0]->device;
1423 chp->dev.release = chp_release;
1424 snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
1425
1426 /* Obtain channel path description and fill it in. */
1427 ret = chsc_determine_channel_path_description(chpid, &chp->desc);
1428 if (ret)
1429 goto out_free;
1430 /* Get channel-measurement characteristics. */
1431 if (css_characteristics_avail && css_chsc_characteristics.scmc
1432 && css_chsc_characteristics.secm) {
1433 ret = chsc_get_channel_measurement_chars(chp);
1434 if (ret)
1435 goto out_free;
1436 } else {
1437 static int msg_done;
1438
1439 if (!msg_done) {
1440 printk(KERN_WARNING "cio: Channel measurements not "
1441 "available, continuing.\n");
1442 msg_done = 1;
1443 }
1444 chp->cmg = -1;
1445 }
1446
1447 /* make it known to the system */
1448 ret = device_register(&chp->dev);
1449 if (ret) {
1450 printk(KERN_WARNING "%s: could not register %02x\n",
1451 __func__, chpid);
1452 goto out_free;
1453 }
1454 ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
1455 if (ret) {
1456 device_unregister(&chp->dev);
1457 goto out_free;
1458 }
1459 mutex_lock(&css[0]->mutex);
1460 if (css[0]->cm_enabled) {
1461 ret = chsc_add_chp_cmg_attr(chp);
1462 if (ret) {
1463 sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
1464 device_unregister(&chp->dev);
1465 mutex_unlock(&css[0]->mutex);
1466 goto out_free;
1467 }
1468 }
1469 css[0]->chps[chpid] = chp;
1470 mutex_unlock(&css[0]->mutex);
1471 return ret;
1472 out_free:
1473 kfree(chp);
1474 return ret;
1475 }
1476
1477 void *
1478 chsc_get_chp_desc(struct subchannel *sch, int chp_no)
1479 {
1480 struct channel_path *chp;
1481 struct channel_path_desc *desc;
1482
1483 chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
1484 if (!chp)
1485 return NULL;
1486 desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
1487 if (!desc)
1488 return NULL;
1489 memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
1490 return desc;
1491 }
1492
1493 static int __init
1494 chsc_alloc_sei_area(void)
1495 {
1496 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1497 if (!sei_page)
1498 printk(KERN_WARNING"Can't allocate page for processing of " \
1499 "chsc machine checks!\n");
1500 return (sei_page ? 0 : -ENOMEM);
1501 }
1502
1503 int __init
1504 chsc_enable_facility(int operation_code)
1505 {
1506 int ret;
1507 struct {
1508 struct chsc_header request;
1509 u8 reserved1:4;
1510 u8 format:4;
1511 u8 reserved2;
1512 u16 operation_code;
1513 u32 reserved3;
1514 u32 reserved4;
1515 u32 operation_data_area[252];
1516 struct chsc_header response;
1517 u32 reserved5:4;
1518 u32 format2:4;
1519 u32 reserved6:24;
1520 } *sda_area;
1521
1522 sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
1523 if (!sda_area)
1524 return -ENOMEM;
1525 sda_area->request.length = 0x0400;
1526 sda_area->request.code = 0x0031;
1527 sda_area->operation_code = operation_code;
1528
1529 ret = chsc(sda_area);
1530 if (ret > 0) {
1531 ret = (ret == 3) ? -ENODEV : -EBUSY;
1532 goto out;
1533 }
1534 switch (sda_area->response.code) {
1535 case 0x0001: /* everything ok */
1536 ret = 0;
1537 break;
1538 case 0x0003: /* invalid request block */
1539 case 0x0007:
1540 ret = -EINVAL;
1541 break;
1542 case 0x0004: /* command not provided */
1543 case 0x0101: /* facility not provided */
1544 ret = -EOPNOTSUPP;
1545 break;
1546 default: /* something went wrong */
1547 ret = -EIO;
1548 }
1549 out:
1550 free_page((unsigned long)sda_area);
1551 return ret;
1552 }
1553
1554 subsys_initcall(chsc_alloc_sei_area);
1555
1556 struct css_general_char css_general_characteristics;
1557 struct css_chsc_char css_chsc_characteristics;
1558
1559 int __init
1560 chsc_determine_css_characteristics(void)
1561 {
1562 int result;
1563 struct {
1564 struct chsc_header request;
1565 u32 reserved1;
1566 u32 reserved2;
1567 u32 reserved3;
1568 struct chsc_header response;
1569 u32 reserved4;
1570 u32 general_char[510];
1571 u32 chsc_char[518];
1572 } *scsc_area;
1573
1574 scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1575 if (!scsc_area) {
1576 printk(KERN_WARNING"cio: Was not able to determine available" \
1577 "CHSCs due to no memory.\n");
1578 return -ENOMEM;
1579 }
1580
1581 scsc_area->request.length = 0x0010;
1582 scsc_area->request.code = 0x0010;
1583
1584 result = chsc(scsc_area);
1585 if (result) {
1586 printk(KERN_WARNING"cio: Was not able to determine " \
1587 "available CHSCs, cc=%i.\n", result);
1588 result = -EIO;
1589 goto exit;
1590 }
1591
1592 if (scsc_area->response.code != 1) {
1593 printk(KERN_WARNING"cio: Was not able to determine " \
1594 "available CHSCs.\n");
1595 result = -EIO;
1596 goto exit;
1597 }
1598 memcpy(&css_general_characteristics, scsc_area->general_char,
1599 sizeof(css_general_characteristics));
1600 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1601 sizeof(css_chsc_characteristics));
1602 exit:
1603 free_page ((unsigned long) scsc_area);
1604 return result;
1605 }
1606
1607 EXPORT_SYMBOL_GPL(css_general_characteristics);
1608 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
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