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[S390] chsc: use the global page to determine the chp desriptor
[~shefty/rdma-dev.git] / drivers / s390 / cio / chsc.c
1 /*
2  *  drivers/s390/cio/chsc.c
3  *   S/390 common I/O routines -- channel subsystem call
4  *
5  *    Copyright IBM Corp. 1999,2010
6  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
8  *               Arnd Bergmann (arndb@de.ibm.com)
9  */
10
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18
19 #include <asm/cio.h>
20 #include <asm/chpid.h>
21 #include <asm/chsc.h>
22 #include <asm/crw.h>
23
24 #include "css.h"
25 #include "cio.h"
26 #include "cio_debug.h"
27 #include "ioasm.h"
28 #include "chp.h"
29 #include "chsc.h"
30
31 static void *sei_page;
32 static void *chsc_page;
33 static DEFINE_SPINLOCK(chsc_page_lock);
34
35 /**
36  * chsc_error_from_response() - convert a chsc response to an error
37  * @response: chsc response code
38  *
39  * Returns an appropriate Linux error code for @response.
40  */
41 int chsc_error_from_response(int response)
42 {
43         switch (response) {
44         case 0x0001:
45                 return 0;
46         case 0x0002:
47         case 0x0003:
48         case 0x0006:
49         case 0x0007:
50         case 0x0008:
51         case 0x000a:
52         case 0x0104:
53                 return -EINVAL;
54         case 0x0004:
55                 return -EOPNOTSUPP;
56         default:
57                 return -EIO;
58         }
59 }
60 EXPORT_SYMBOL_GPL(chsc_error_from_response);
61
62 struct chsc_ssd_area {
63         struct chsc_header request;
64         u16 :10;
65         u16 ssid:2;
66         u16 :4;
67         u16 f_sch;        /* first subchannel */
68         u16 :16;
69         u16 l_sch;        /* last subchannel */
70         u32 :32;
71         struct chsc_header response;
72         u32 :32;
73         u8 sch_valid : 1;
74         u8 dev_valid : 1;
75         u8 st        : 3; /* subchannel type */
76         u8 zeroes    : 3;
77         u8  unit_addr;    /* unit address */
78         u16 devno;        /* device number */
79         u8 path_mask;
80         u8 fla_valid_mask;
81         u16 sch;          /* subchannel */
82         u8 chpid[8];      /* chpids 0-7 */
83         u16 fla[8];       /* full link addresses 0-7 */
84 } __attribute__ ((packed));
85
86 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
87 {
88         struct chsc_ssd_area *ssd_area;
89         int ccode;
90         int ret;
91         int i;
92         int mask;
93
94         spin_lock_irq(&chsc_page_lock);
95         memset(chsc_page, 0, PAGE_SIZE);
96         ssd_area = chsc_page;
97         ssd_area->request.length = 0x0010;
98         ssd_area->request.code = 0x0004;
99         ssd_area->ssid = schid.ssid;
100         ssd_area->f_sch = schid.sch_no;
101         ssd_area->l_sch = schid.sch_no;
102
103         ccode = chsc(ssd_area);
104         /* Check response. */
105         if (ccode > 0) {
106                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
107                 goto out;
108         }
109         ret = chsc_error_from_response(ssd_area->response.code);
110         if (ret != 0) {
111                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
112                               schid.ssid, schid.sch_no,
113                               ssd_area->response.code);
114                 goto out;
115         }
116         if (!ssd_area->sch_valid) {
117                 ret = -ENODEV;
118                 goto out;
119         }
120         /* Copy data */
121         ret = 0;
122         memset(ssd, 0, sizeof(struct chsc_ssd_info));
123         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
124             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
125                 goto out;
126         ssd->path_mask = ssd_area->path_mask;
127         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
128         for (i = 0; i < 8; i++) {
129                 mask = 0x80 >> i;
130                 if (ssd_area->path_mask & mask) {
131                         chp_id_init(&ssd->chpid[i]);
132                         ssd->chpid[i].id = ssd_area->chpid[i];
133                 }
134                 if (ssd_area->fla_valid_mask & mask)
135                         ssd->fla[i] = ssd_area->fla[i];
136         }
137 out:
138         spin_unlock_irq(&chsc_page_lock);
139         return ret;
140 }
141
142 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
143 {
144         spin_lock_irq(sch->lock);
145         if (sch->driver && sch->driver->chp_event)
146                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
147                         goto out_unreg;
148         spin_unlock_irq(sch->lock);
149         return 0;
150
151 out_unreg:
152         sch->lpm = 0;
153         spin_unlock_irq(sch->lock);
154         css_schedule_eval(sch->schid);
155         return 0;
156 }
157
158 void chsc_chp_offline(struct chp_id chpid)
159 {
160         char dbf_txt[15];
161         struct chp_link link;
162
163         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
164         CIO_TRACE_EVENT(2, dbf_txt);
165
166         if (chp_get_status(chpid) <= 0)
167                 return;
168         memset(&link, 0, sizeof(struct chp_link));
169         link.chpid = chpid;
170         /* Wait until previous actions have settled. */
171         css_wait_for_slow_path();
172         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
173 }
174
175 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
176 {
177         struct schib schib;
178         /*
179          * We don't know the device yet, but since a path
180          * may be available now to the device we'll have
181          * to do recognition again.
182          * Since we don't have any idea about which chpid
183          * that beast may be on we'll have to do a stsch
184          * on all devices, grr...
185          */
186         if (stsch_err(schid, &schib))
187                 /* We're through */
188                 return -ENXIO;
189
190         /* Put it on the slow path. */
191         css_schedule_eval(schid);
192         return 0;
193 }
194
195 static int __s390_process_res_acc(struct subchannel *sch, void *data)
196 {
197         spin_lock_irq(sch->lock);
198         if (sch->driver && sch->driver->chp_event)
199                 sch->driver->chp_event(sch, data, CHP_ONLINE);
200         spin_unlock_irq(sch->lock);
201
202         return 0;
203 }
204
205 static void s390_process_res_acc(struct chp_link *link)
206 {
207         char dbf_txt[15];
208
209         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
210                 link->chpid.id);
211         CIO_TRACE_EVENT( 2, dbf_txt);
212         if (link->fla != 0) {
213                 sprintf(dbf_txt, "fla%x", link->fla);
214                 CIO_TRACE_EVENT( 2, dbf_txt);
215         }
216         /* Wait until previous actions have settled. */
217         css_wait_for_slow_path();
218         /*
219          * I/O resources may have become accessible.
220          * Scan through all subchannels that may be concerned and
221          * do a validation on those.
222          * The more information we have (info), the less scanning
223          * will we have to do.
224          */
225         for_each_subchannel_staged(__s390_process_res_acc,
226                                    s390_process_res_acc_new_sch, link);
227 }
228
229 static int
230 __get_chpid_from_lir(void *data)
231 {
232         struct lir {
233                 u8  iq;
234                 u8  ic;
235                 u16 sci;
236                 /* incident-node descriptor */
237                 u32 indesc[28];
238                 /* attached-node descriptor */
239                 u32 andesc[28];
240                 /* incident-specific information */
241                 u32 isinfo[28];
242         } __attribute__ ((packed)) *lir;
243
244         lir = data;
245         if (!(lir->iq&0x80))
246                 /* NULL link incident record */
247                 return -EINVAL;
248         if (!(lir->indesc[0]&0xc0000000))
249                 /* node descriptor not valid */
250                 return -EINVAL;
251         if (!(lir->indesc[0]&0x10000000))
252                 /* don't handle device-type nodes - FIXME */
253                 return -EINVAL;
254         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
255
256         return (u16) (lir->indesc[0]&0x000000ff);
257 }
258
259 struct chsc_sei_area {
260         struct chsc_header request;
261         u32 reserved1;
262         u32 reserved2;
263         u32 reserved3;
264         struct chsc_header response;
265         u32 reserved4;
266         u8  flags;
267         u8  vf;         /* validity flags */
268         u8  rs;         /* reporting source */
269         u8  cc;         /* content code */
270         u16 fla;        /* full link address */
271         u16 rsid;       /* reporting source id */
272         u32 reserved5;
273         u32 reserved6;
274         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
275         /* ccdf has to be big enough for a link-incident record */
276 } __attribute__ ((packed));
277
278 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
279 {
280         struct chp_id chpid;
281         int id;
282
283         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
284                       sei_area->rs, sei_area->rsid);
285         if (sei_area->rs != 4)
286                 return;
287         id = __get_chpid_from_lir(sei_area->ccdf);
288         if (id < 0)
289                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
290         else {
291                 chp_id_init(&chpid);
292                 chpid.id = id;
293                 chsc_chp_offline(chpid);
294         }
295 }
296
297 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
298 {
299         struct chp_link link;
300         struct chp_id chpid;
301         int status;
302
303         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
304                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
305         if (sei_area->rs != 4)
306                 return;
307         chp_id_init(&chpid);
308         chpid.id = sei_area->rsid;
309         /* allocate a new channel path structure, if needed */
310         status = chp_get_status(chpid);
311         if (status < 0)
312                 chp_new(chpid);
313         else if (!status)
314                 return;
315         memset(&link, 0, sizeof(struct chp_link));
316         link.chpid = chpid;
317         if ((sei_area->vf & 0xc0) != 0) {
318                 link.fla = sei_area->fla;
319                 if ((sei_area->vf & 0xc0) == 0xc0)
320                         /* full link address */
321                         link.fla_mask = 0xffff;
322                 else
323                         /* link address */
324                         link.fla_mask = 0xff00;
325         }
326         s390_process_res_acc(&link);
327 }
328
329 struct chp_config_data {
330         u8 map[32];
331         u8 op;
332         u8 pc;
333 };
334
335 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
336 {
337         struct chp_config_data *data;
338         struct chp_id chpid;
339         int num;
340         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
341
342         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
343         if (sei_area->rs != 0)
344                 return;
345         data = (struct chp_config_data *) &(sei_area->ccdf);
346         chp_id_init(&chpid);
347         for (num = 0; num <= __MAX_CHPID; num++) {
348                 if (!chp_test_bit(data->map, num))
349                         continue;
350                 chpid.id = num;
351                 pr_notice("Processing %s for channel path %x.%02x\n",
352                           events[data->op], chpid.cssid, chpid.id);
353                 switch (data->op) {
354                 case 0:
355                         chp_cfg_schedule(chpid, 1);
356                         break;
357                 case 1:
358                         chp_cfg_schedule(chpid, 0);
359                         break;
360                 case 2:
361                         chp_cfg_cancel_deconfigure(chpid);
362                         break;
363                 }
364         }
365 }
366
367 static void chsc_process_sei(struct chsc_sei_area *sei_area)
368 {
369         /* Check if we might have lost some information. */
370         if (sei_area->flags & 0x40) {
371                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
372                 css_schedule_eval_all();
373         }
374         /* which kind of information was stored? */
375         switch (sei_area->cc) {
376         case 1: /* link incident*/
377                 chsc_process_sei_link_incident(sei_area);
378                 break;
379         case 2: /* i/o resource accessibiliy */
380                 chsc_process_sei_res_acc(sei_area);
381                 break;
382         case 8: /* channel-path-configuration notification */
383                 chsc_process_sei_chp_config(sei_area);
384                 break;
385         default: /* other stuff */
386                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
387                               sei_area->cc);
388                 break;
389         }
390 }
391
392 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
393 {
394         struct chsc_sei_area *sei_area;
395
396         if (overflow) {
397                 css_schedule_eval_all();
398                 return;
399         }
400         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
401                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
402                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
403                       crw0->erc, crw0->rsid);
404         if (!sei_page)
405                 return;
406         /* Access to sei_page is serialized through machine check handler
407          * thread, so no need for locking. */
408         sei_area = sei_page;
409
410         CIO_TRACE_EVENT(2, "prcss");
411         do {
412                 memset(sei_area, 0, sizeof(*sei_area));
413                 sei_area->request.length = 0x0010;
414                 sei_area->request.code = 0x000e;
415                 if (chsc(sei_area))
416                         break;
417
418                 if (sei_area->response.code == 0x0001) {
419                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
420                         chsc_process_sei(sei_area);
421                 } else {
422                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
423                                       sei_area->response.code);
424                         break;
425                 }
426         } while (sei_area->flags & 0x80);
427 }
428
429 void chsc_chp_online(struct chp_id chpid)
430 {
431         char dbf_txt[15];
432         struct chp_link link;
433
434         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
435         CIO_TRACE_EVENT(2, dbf_txt);
436
437         if (chp_get_status(chpid) != 0) {
438                 memset(&link, 0, sizeof(struct chp_link));
439                 link.chpid = chpid;
440                 /* Wait until previous actions have settled. */
441                 css_wait_for_slow_path();
442                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
443                                            &link);
444         }
445 }
446
447 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
448                                          struct chp_id chpid, int on)
449 {
450         unsigned long flags;
451         struct chp_link link;
452
453         memset(&link, 0, sizeof(struct chp_link));
454         link.chpid = chpid;
455         spin_lock_irqsave(sch->lock, flags);
456         if (sch->driver && sch->driver->chp_event)
457                 sch->driver->chp_event(sch, &link,
458                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
459         spin_unlock_irqrestore(sch->lock, flags);
460 }
461
462 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
463 {
464         struct chp_id *chpid = data;
465
466         __s390_subchannel_vary_chpid(sch, *chpid, 0);
467         return 0;
468 }
469
470 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
471 {
472         struct chp_id *chpid = data;
473
474         __s390_subchannel_vary_chpid(sch, *chpid, 1);
475         return 0;
476 }
477
478 static int
479 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
480 {
481         struct schib schib;
482
483         if (stsch_err(schid, &schib))
484                 /* We're through */
485                 return -ENXIO;
486         /* Put it on the slow path. */
487         css_schedule_eval(schid);
488         return 0;
489 }
490
491 /**
492  * chsc_chp_vary - propagate channel-path vary operation to subchannels
493  * @chpid: channl-path ID
494  * @on: non-zero for vary online, zero for vary offline
495  */
496 int chsc_chp_vary(struct chp_id chpid, int on)
497 {
498         struct chp_link link;
499
500         memset(&link, 0, sizeof(struct chp_link));
501         link.chpid = chpid;
502         /* Wait until previous actions have settled. */
503         css_wait_for_slow_path();
504         /*
505          * Redo PathVerification on the devices the chpid connects to
506          */
507
508         if (on)
509                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
510                                            __s390_vary_chpid_on, &link);
511         else
512                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
513                                            NULL, &link);
514
515         return 0;
516 }
517
518 static void
519 chsc_remove_cmg_attr(struct channel_subsystem *css)
520 {
521         int i;
522
523         for (i = 0; i <= __MAX_CHPID; i++) {
524                 if (!css->chps[i])
525                         continue;
526                 chp_remove_cmg_attr(css->chps[i]);
527         }
528 }
529
530 static int
531 chsc_add_cmg_attr(struct channel_subsystem *css)
532 {
533         int i, ret;
534
535         ret = 0;
536         for (i = 0; i <= __MAX_CHPID; i++) {
537                 if (!css->chps[i])
538                         continue;
539                 ret = chp_add_cmg_attr(css->chps[i]);
540                 if (ret)
541                         goto cleanup;
542         }
543         return ret;
544 cleanup:
545         for (--i; i >= 0; i--) {
546                 if (!css->chps[i])
547                         continue;
548                 chp_remove_cmg_attr(css->chps[i]);
549         }
550         return ret;
551 }
552
553 int __chsc_do_secm(struct channel_subsystem *css, int enable)
554 {
555         struct {
556                 struct chsc_header request;
557                 u32 operation_code : 2;
558                 u32 : 30;
559                 u32 key : 4;
560                 u32 : 28;
561                 u32 zeroes1;
562                 u32 cub_addr1;
563                 u32 zeroes2;
564                 u32 cub_addr2;
565                 u32 reserved[13];
566                 struct chsc_header response;
567                 u32 status : 8;
568                 u32 : 4;
569                 u32 fmt : 4;
570                 u32 : 16;
571         } __attribute__ ((packed)) *secm_area;
572         int ret, ccode;
573
574         spin_lock_irq(&chsc_page_lock);
575         memset(chsc_page, 0, PAGE_SIZE);
576         secm_area = chsc_page;
577         secm_area->request.length = 0x0050;
578         secm_area->request.code = 0x0016;
579
580         secm_area->key = PAGE_DEFAULT_KEY >> 4;
581         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
582         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
583
584         secm_area->operation_code = enable ? 0 : 1;
585
586         ccode = chsc(secm_area);
587         if (ccode > 0) {
588                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
589                 goto out;
590         }
591
592         switch (secm_area->response.code) {
593         case 0x0102:
594         case 0x0103:
595                 ret = -EINVAL;
596                 break;
597         default:
598                 ret = chsc_error_from_response(secm_area->response.code);
599         }
600         if (ret != 0)
601                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
602                               secm_area->response.code);
603 out:
604         spin_unlock_irq(&chsc_page_lock);
605         return ret;
606 }
607
608 int
609 chsc_secm(struct channel_subsystem *css, int enable)
610 {
611         int ret;
612
613         if (enable && !css->cm_enabled) {
614                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
615                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
616                 if (!css->cub_addr1 || !css->cub_addr2) {
617                         free_page((unsigned long)css->cub_addr1);
618                         free_page((unsigned long)css->cub_addr2);
619                         return -ENOMEM;
620                 }
621         }
622         ret = __chsc_do_secm(css, enable);
623         if (!ret) {
624                 css->cm_enabled = enable;
625                 if (css->cm_enabled) {
626                         ret = chsc_add_cmg_attr(css);
627                         if (ret) {
628                                 __chsc_do_secm(css, 0);
629                                 css->cm_enabled = 0;
630                         }
631                 } else
632                         chsc_remove_cmg_attr(css);
633         }
634         if (!css->cm_enabled) {
635                 free_page((unsigned long)css->cub_addr1);
636                 free_page((unsigned long)css->cub_addr2);
637         }
638         return ret;
639 }
640
641 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
642                                      int c, int m, void *page)
643 {
644         struct chsc_scpd *scpd_area;
645         int ccode, ret;
646
647         if ((rfmt == 1) && !css_general_characteristics.fcs)
648                 return -EINVAL;
649         if ((rfmt == 2) && !css_general_characteristics.cib)
650                 return -EINVAL;
651
652         memset(page, 0, PAGE_SIZE);
653         scpd_area = page;
654         scpd_area->request.length = 0x0010;
655         scpd_area->request.code = 0x0002;
656         scpd_area->cssid = chpid.cssid;
657         scpd_area->first_chpid = chpid.id;
658         scpd_area->last_chpid = chpid.id;
659         scpd_area->m = m;
660         scpd_area->c = c;
661         scpd_area->fmt = fmt;
662         scpd_area->rfmt = rfmt;
663
664         ccode = chsc(scpd_area);
665         if (ccode > 0)
666                 return (ccode == 3) ? -ENODEV : -EBUSY;
667
668         ret = chsc_error_from_response(scpd_area->response.code);
669         if (ret)
670                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
671                               scpd_area->response.code);
672         return ret;
673 }
674 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
675
676 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
677                                           struct channel_path_desc *desc)
678 {
679         struct chsc_response_struct *chsc_resp;
680         struct chsc_scpd *scpd_area;
681         int ret;
682
683         spin_lock_irq(&chsc_page_lock);
684         scpd_area = chsc_page;
685         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
686         if (ret)
687                 goto out;
688         chsc_resp = (void *)&scpd_area->response;
689         memcpy(desc, &chsc_resp->data, sizeof(*desc));
690 out:
691         spin_unlock_irq(&chsc_page_lock);
692         return ret;
693 }
694
695 static void
696 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
697                           struct cmg_chars *chars)
698 {
699         struct cmg_chars *cmg_chars;
700         int i, mask;
701
702         cmg_chars = chp->cmg_chars;
703         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
704                 mask = 0x80 >> (i + 3);
705                 if (cmcv & mask)
706                         cmg_chars->values[i] = chars->values[i];
707                 else
708                         cmg_chars->values[i] = 0;
709         }
710 }
711
712 int chsc_get_channel_measurement_chars(struct channel_path *chp)
713 {
714         struct cmg_chars *cmg_chars;
715         int ccode, ret;
716
717         struct {
718                 struct chsc_header request;
719                 u32 : 24;
720                 u32 first_chpid : 8;
721                 u32 : 24;
722                 u32 last_chpid : 8;
723                 u32 zeroes1;
724                 struct chsc_header response;
725                 u32 zeroes2;
726                 u32 not_valid : 1;
727                 u32 shared : 1;
728                 u32 : 22;
729                 u32 chpid : 8;
730                 u32 cmcv : 5;
731                 u32 : 11;
732                 u32 cmgq : 8;
733                 u32 cmg : 8;
734                 u32 zeroes3;
735                 u32 data[NR_MEASUREMENT_CHARS];
736         } __attribute__ ((packed)) *scmc_area;
737
738         chp->cmg_chars = NULL;
739         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
740         if (!cmg_chars)
741                 return -ENOMEM;
742
743         spin_lock_irq(&chsc_page_lock);
744         memset(chsc_page, 0, PAGE_SIZE);
745         scmc_area = chsc_page;
746         scmc_area->request.length = 0x0010;
747         scmc_area->request.code = 0x0022;
748         scmc_area->first_chpid = chp->chpid.id;
749         scmc_area->last_chpid = chp->chpid.id;
750
751         ccode = chsc(scmc_area);
752         if (ccode > 0) {
753                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
754                 goto out;
755         }
756
757         ret = chsc_error_from_response(scmc_area->response.code);
758         if (ret) {
759                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
760                               scmc_area->response.code);
761                 goto out;
762         }
763         if (scmc_area->not_valid) {
764                 chp->cmg = -1;
765                 chp->shared = -1;
766                 goto out;
767         }
768         chp->cmg = scmc_area->cmg;
769         chp->shared = scmc_area->shared;
770         if (chp->cmg != 2 && chp->cmg != 3) {
771                 /* No cmg-dependent data. */
772                 goto out;
773         }
774         chp->cmg_chars = cmg_chars;
775         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
776                                   (struct cmg_chars *) &scmc_area->data);
777 out:
778         spin_unlock_irq(&chsc_page_lock);
779         if (!chp->cmg_chars)
780                 kfree(cmg_chars);
781
782         return ret;
783 }
784
785 int __init chsc_init(void)
786 {
787         int ret;
788
789         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
790         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
791         if (!sei_page || !chsc_page) {
792                 ret = -ENOMEM;
793                 goto out_err;
794         }
795         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
796         if (ret)
797                 goto out_err;
798         return ret;
799 out_err:
800         free_page((unsigned long)chsc_page);
801         free_page((unsigned long)sei_page);
802         return ret;
803 }
804
805 void __init chsc_init_cleanup(void)
806 {
807         crw_unregister_handler(CRW_RSC_CSS);
808         free_page((unsigned long)chsc_page);
809         free_page((unsigned long)sei_page);
810 }
811
812 int chsc_enable_facility(int operation_code)
813 {
814         unsigned long flags;
815         int ret;
816         struct {
817                 struct chsc_header request;
818                 u8 reserved1:4;
819                 u8 format:4;
820                 u8 reserved2;
821                 u16 operation_code;
822                 u32 reserved3;
823                 u32 reserved4;
824                 u32 operation_data_area[252];
825                 struct chsc_header response;
826                 u32 reserved5:4;
827                 u32 format2:4;
828                 u32 reserved6:24;
829         } __attribute__ ((packed)) *sda_area;
830
831         spin_lock_irqsave(&chsc_page_lock, flags);
832         memset(chsc_page, 0, PAGE_SIZE);
833         sda_area = chsc_page;
834         sda_area->request.length = 0x0400;
835         sda_area->request.code = 0x0031;
836         sda_area->operation_code = operation_code;
837
838         ret = chsc(sda_area);
839         if (ret > 0) {
840                 ret = (ret == 3) ? -ENODEV : -EBUSY;
841                 goto out;
842         }
843
844         switch (sda_area->response.code) {
845         case 0x0101:
846                 ret = -EOPNOTSUPP;
847                 break;
848         default:
849                 ret = chsc_error_from_response(sda_area->response.code);
850         }
851         if (ret != 0)
852                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
853                               operation_code, sda_area->response.code);
854 out:
855         spin_unlock_irqrestore(&chsc_page_lock, flags);
856         return ret;
857 }
858
859 struct css_general_char css_general_characteristics;
860 struct css_chsc_char css_chsc_characteristics;
861
862 int __init
863 chsc_determine_css_characteristics(void)
864 {
865         int result;
866         struct {
867                 struct chsc_header request;
868                 u32 reserved1;
869                 u32 reserved2;
870                 u32 reserved3;
871                 struct chsc_header response;
872                 u32 reserved4;
873                 u32 general_char[510];
874                 u32 chsc_char[508];
875         } __attribute__ ((packed)) *scsc_area;
876
877         spin_lock_irq(&chsc_page_lock);
878         memset(chsc_page, 0, PAGE_SIZE);
879         scsc_area = chsc_page;
880         scsc_area->request.length = 0x0010;
881         scsc_area->request.code = 0x0010;
882
883         result = chsc(scsc_area);
884         if (result) {
885                 result = (result == 3) ? -ENODEV : -EBUSY;
886                 goto exit;
887         }
888
889         result = chsc_error_from_response(scsc_area->response.code);
890         if (result == 0) {
891                 memcpy(&css_general_characteristics, scsc_area->general_char,
892                        sizeof(css_general_characteristics));
893                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
894                        sizeof(css_chsc_characteristics));
895         } else
896                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
897                               scsc_area->response.code);
898 exit:
899         spin_unlock_irq(&chsc_page_lock);
900         return result;
901 }
902
903 EXPORT_SYMBOL_GPL(css_general_characteristics);
904 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
905
906 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
907 {
908         struct {
909                 struct chsc_header request;
910                 unsigned int rsvd0;
911                 unsigned int op : 8;
912                 unsigned int rsvd1 : 8;
913                 unsigned int ctrl : 16;
914                 unsigned int rsvd2[5];
915                 struct chsc_header response;
916                 unsigned int rsvd3[7];
917         } __attribute__ ((packed)) *rr;
918         int rc;
919
920         memset(page, 0, PAGE_SIZE);
921         rr = page;
922         rr->request.length = 0x0020;
923         rr->request.code = 0x0033;
924         rr->op = op;
925         rr->ctrl = ctrl;
926         rc = chsc(rr);
927         if (rc)
928                 return -EIO;
929         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
930         return rc;
931 }
932
933 int chsc_sstpi(void *page, void *result, size_t size)
934 {
935         struct {
936                 struct chsc_header request;
937                 unsigned int rsvd0[3];
938                 struct chsc_header response;
939                 char data[size];
940         } __attribute__ ((packed)) *rr;
941         int rc;
942
943         memset(page, 0, PAGE_SIZE);
944         rr = page;
945         rr->request.length = 0x0010;
946         rr->request.code = 0x0038;
947         rc = chsc(rr);
948         if (rc)
949                 return -EIO;
950         memcpy(result, &rr->data, size);
951         return (rr->response.code == 0x0001) ? 0 : -EIO;
952 }
953
954 int chsc_siosl(struct subchannel_id schid)
955 {
956         struct {
957                 struct chsc_header request;
958                 u32 word1;
959                 struct subchannel_id sid;
960                 u32 word3;
961                 struct chsc_header response;
962                 u32 word[11];
963         } __attribute__ ((packed)) *siosl_area;
964         unsigned long flags;
965         int ccode;
966         int rc;
967
968         spin_lock_irqsave(&chsc_page_lock, flags);
969         memset(chsc_page, 0, PAGE_SIZE);
970         siosl_area = chsc_page;
971         siosl_area->request.length = 0x0010;
972         siosl_area->request.code = 0x0046;
973         siosl_area->word1 = 0x80000000;
974         siosl_area->sid = schid;
975
976         ccode = chsc(siosl_area);
977         if (ccode > 0) {
978                 if (ccode == 3)
979                         rc = -ENODEV;
980                 else
981                         rc = -EBUSY;
982                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
983                               schid.ssid, schid.sch_no, ccode);
984                 goto out;
985         }
986         rc = chsc_error_from_response(siosl_area->response.code);
987         if (rc)
988                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
989                               schid.ssid, schid.sch_no,
990                               siosl_area->response.code);
991         else
992                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
993                               schid.ssid, schid.sch_no);
994 out:
995         spin_unlock_irqrestore(&chsc_page_lock, flags);
996         return rc;
997 }
998 EXPORT_SYMBOL_GPL(chsc_siosl);