Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask
[linux-2.6] / 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. 1999,2008
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
33 /**
34  * chsc_error_from_response() - convert a chsc response to an error
35  * @response: chsc response code
36  *
37  * Returns an appropriate Linux error code for @response.
38  */
39 int chsc_error_from_response(int response)
40 {
41         switch (response) {
42         case 0x0001:
43                 return 0;
44         case 0x0002:
45         case 0x0003:
46         case 0x0006:
47         case 0x0007:
48         case 0x0008:
49         case 0x000a:
50                 return -EINVAL;
51         case 0x0004:
52                 return -EOPNOTSUPP;
53         default:
54                 return -EIO;
55         }
56 }
57 EXPORT_SYMBOL_GPL(chsc_error_from_response);
58
59 struct chsc_ssd_area {
60         struct chsc_header request;
61         u16 :10;
62         u16 ssid:2;
63         u16 :4;
64         u16 f_sch;        /* first subchannel */
65         u16 :16;
66         u16 l_sch;        /* last subchannel */
67         u32 :32;
68         struct chsc_header response;
69         u32 :32;
70         u8 sch_valid : 1;
71         u8 dev_valid : 1;
72         u8 st        : 3; /* subchannel type */
73         u8 zeroes    : 3;
74         u8  unit_addr;    /* unit address */
75         u16 devno;        /* device number */
76         u8 path_mask;
77         u8 fla_valid_mask;
78         u16 sch;          /* subchannel */
79         u8 chpid[8];      /* chpids 0-7 */
80         u16 fla[8];       /* full link addresses 0-7 */
81 } __attribute__ ((packed));
82
83 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
84 {
85         unsigned long page;
86         struct chsc_ssd_area *ssd_area;
87         int ccode;
88         int ret;
89         int i;
90         int mask;
91
92         page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
93         if (!page)
94                 return -ENOMEM;
95         ssd_area = (struct chsc_ssd_area *) page;
96         ssd_area->request.length = 0x0010;
97         ssd_area->request.code = 0x0004;
98         ssd_area->ssid = schid.ssid;
99         ssd_area->f_sch = schid.sch_no;
100         ssd_area->l_sch = schid.sch_no;
101
102         ccode = chsc(ssd_area);
103         /* Check response. */
104         if (ccode > 0) {
105                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
106                 goto out_free;
107         }
108         ret = chsc_error_from_response(ssd_area->response.code);
109         if (ret != 0) {
110                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
111                               schid.ssid, schid.sch_no,
112                               ssd_area->response.code);
113                 goto out_free;
114         }
115         if (!ssd_area->sch_valid) {
116                 ret = -ENODEV;
117                 goto out_free;
118         }
119         /* Copy data */
120         ret = 0;
121         memset(ssd, 0, sizeof(struct chsc_ssd_info));
122         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
123             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
124                 goto out_free;
125         ssd->path_mask = ssd_area->path_mask;
126         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
127         for (i = 0; i < 8; i++) {
128                 mask = 0x80 >> i;
129                 if (ssd_area->path_mask & mask) {
130                         chp_id_init(&ssd->chpid[i]);
131                         ssd->chpid[i].id = ssd_area->chpid[i];
132                 }
133                 if (ssd_area->fla_valid_mask & mask)
134                         ssd->fla[i] = ssd_area->fla[i];
135         }
136 out_free:
137         free_page(page);
138         return ret;
139 }
140
141 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
142 {
143         spin_lock_irq(sch->lock);
144         if (sch->driver && sch->driver->chp_event)
145                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
146                         goto out_unreg;
147         spin_unlock_irq(sch->lock);
148         return 0;
149
150 out_unreg:
151         sch->lpm = 0;
152         spin_unlock_irq(sch->lock);
153         css_schedule_eval(sch->schid);
154         return 0;
155 }
156
157 void chsc_chp_offline(struct chp_id chpid)
158 {
159         char dbf_txt[15];
160         struct chp_link link;
161
162         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
163         CIO_TRACE_EVENT(2, dbf_txt);
164
165         if (chp_get_status(chpid) <= 0)
166                 return;
167         memset(&link, 0, sizeof(struct chp_link));
168         link.chpid = chpid;
169         /* Wait until previous actions have settled. */
170         css_wait_for_slow_path();
171         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
172 }
173
174 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
175 {
176         struct schib schib;
177         /*
178          * We don't know the device yet, but since a path
179          * may be available now to the device we'll have
180          * to do recognition again.
181          * Since we don't have any idea about which chpid
182          * that beast may be on we'll have to do a stsch
183          * on all devices, grr...
184          */
185         if (stsch_err(schid, &schib))
186                 /* We're through */
187                 return -ENXIO;
188
189         /* Put it on the slow path. */
190         css_schedule_eval(schid);
191         return 0;
192 }
193
194 static int __s390_process_res_acc(struct subchannel *sch, void *data)
195 {
196         spin_lock_irq(sch->lock);
197         if (sch->driver && sch->driver->chp_event)
198                 sch->driver->chp_event(sch, data, CHP_ONLINE);
199         spin_unlock_irq(sch->lock);
200
201         return 0;
202 }
203
204 static void s390_process_res_acc(struct chp_link *link)
205 {
206         char dbf_txt[15];
207
208         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
209                 link->chpid.id);
210         CIO_TRACE_EVENT( 2, dbf_txt);
211         if (link->fla != 0) {
212                 sprintf(dbf_txt, "fla%x", link->fla);
213                 CIO_TRACE_EVENT( 2, dbf_txt);
214         }
215         /* Wait until previous actions have settled. */
216         css_wait_for_slow_path();
217         /*
218          * I/O resources may have become accessible.
219          * Scan through all subchannels that may be concerned and
220          * do a validation on those.
221          * The more information we have (info), the less scanning
222          * will we have to do.
223          */
224         for_each_subchannel_staged(__s390_process_res_acc,
225                                    s390_process_res_acc_new_sch, link);
226 }
227
228 static int
229 __get_chpid_from_lir(void *data)
230 {
231         struct lir {
232                 u8  iq;
233                 u8  ic;
234                 u16 sci;
235                 /* incident-node descriptor */
236                 u32 indesc[28];
237                 /* attached-node descriptor */
238                 u32 andesc[28];
239                 /* incident-specific information */
240                 u32 isinfo[28];
241         } __attribute__ ((packed)) *lir;
242
243         lir = data;
244         if (!(lir->iq&0x80))
245                 /* NULL link incident record */
246                 return -EINVAL;
247         if (!(lir->indesc[0]&0xc0000000))
248                 /* node descriptor not valid */
249                 return -EINVAL;
250         if (!(lir->indesc[0]&0x10000000))
251                 /* don't handle device-type nodes - FIXME */
252                 return -EINVAL;
253         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
254
255         return (u16) (lir->indesc[0]&0x000000ff);
256 }
257
258 struct chsc_sei_area {
259         struct chsc_header request;
260         u32 reserved1;
261         u32 reserved2;
262         u32 reserved3;
263         struct chsc_header response;
264         u32 reserved4;
265         u8  flags;
266         u8  vf;         /* validity flags */
267         u8  rs;         /* reporting source */
268         u8  cc;         /* content code */
269         u16 fla;        /* full link address */
270         u16 rsid;       /* reporting source id */
271         u32 reserved5;
272         u32 reserved6;
273         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
274         /* ccdf has to be big enough for a link-incident record */
275 } __attribute__ ((packed));
276
277 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
278 {
279         struct chp_id chpid;
280         int id;
281
282         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
283                       sei_area->rs, sei_area->rsid);
284         if (sei_area->rs != 4)
285                 return;
286         id = __get_chpid_from_lir(sei_area->ccdf);
287         if (id < 0)
288                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
289         else {
290                 chp_id_init(&chpid);
291                 chpid.id = id;
292                 chsc_chp_offline(chpid);
293         }
294 }
295
296 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
297 {
298         struct chp_link link;
299         struct chp_id chpid;
300         int status;
301
302         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
303                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
304         if (sei_area->rs != 4)
305                 return;
306         chp_id_init(&chpid);
307         chpid.id = sei_area->rsid;
308         /* allocate a new channel path structure, if needed */
309         status = chp_get_status(chpid);
310         if (status < 0)
311                 chp_new(chpid);
312         else if (!status)
313                 return;
314         memset(&link, 0, sizeof(struct chp_link));
315         link.chpid = chpid;
316         if ((sei_area->vf & 0xc0) != 0) {
317                 link.fla = sei_area->fla;
318                 if ((sei_area->vf & 0xc0) == 0xc0)
319                         /* full link address */
320                         link.fla_mask = 0xffff;
321                 else
322                         /* link address */
323                         link.fla_mask = 0xff00;
324         }
325         s390_process_res_acc(&link);
326 }
327
328 struct chp_config_data {
329         u8 map[32];
330         u8 op;
331         u8 pc;
332 };
333
334 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
335 {
336         struct chp_config_data *data;
337         struct chp_id chpid;
338         int num;
339         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
340
341         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
342         if (sei_area->rs != 0)
343                 return;
344         data = (struct chp_config_data *) &(sei_area->ccdf);
345         chp_id_init(&chpid);
346         for (num = 0; num <= __MAX_CHPID; num++) {
347                 if (!chp_test_bit(data->map, num))
348                         continue;
349                 chpid.id = num;
350                 pr_notice("Processing %s for channel path %x.%02x\n",
351                           events[data->op], chpid.cssid, chpid.id);
352                 switch (data->op) {
353                 case 0:
354                         chp_cfg_schedule(chpid, 1);
355                         break;
356                 case 1:
357                         chp_cfg_schedule(chpid, 0);
358                         break;
359                 case 2:
360                         chp_cfg_cancel_deconfigure(chpid);
361                         break;
362                 }
363         }
364 }
365
366 static void chsc_process_sei(struct chsc_sei_area *sei_area)
367 {
368         /* Check if we might have lost some information. */
369         if (sei_area->flags & 0x40) {
370                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
371                 css_schedule_eval_all();
372         }
373         /* which kind of information was stored? */
374         switch (sei_area->cc) {
375         case 1: /* link incident*/
376                 chsc_process_sei_link_incident(sei_area);
377                 break;
378         case 2: /* i/o resource accessibiliy */
379                 chsc_process_sei_res_acc(sei_area);
380                 break;
381         case 8: /* channel-path-configuration notification */
382                 chsc_process_sei_chp_config(sei_area);
383                 break;
384         default: /* other stuff */
385                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
386                               sei_area->cc);
387                 break;
388         }
389 }
390
391 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
392 {
393         struct chsc_sei_area *sei_area;
394
395         if (overflow) {
396                 css_schedule_eval_all();
397                 return;
398         }
399         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
400                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
401                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
402                       crw0->erc, crw0->rsid);
403         if (!sei_page)
404                 return;
405         /* Access to sei_page is serialized through machine check handler
406          * thread, so no need for locking. */
407         sei_area = sei_page;
408
409         CIO_TRACE_EVENT(2, "prcss");
410         do {
411                 memset(sei_area, 0, sizeof(*sei_area));
412                 sei_area->request.length = 0x0010;
413                 sei_area->request.code = 0x000e;
414                 if (chsc(sei_area))
415                         break;
416
417                 if (sei_area->response.code == 0x0001) {
418                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
419                         chsc_process_sei(sei_area);
420                 } else {
421                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
422                                       sei_area->response.code);
423                         break;
424                 }
425         } while (sei_area->flags & 0x80);
426 }
427
428 void chsc_chp_online(struct chp_id chpid)
429 {
430         char dbf_txt[15];
431         struct chp_link link;
432
433         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
434         CIO_TRACE_EVENT(2, dbf_txt);
435
436         if (chp_get_status(chpid) != 0) {
437                 memset(&link, 0, sizeof(struct chp_link));
438                 link.chpid = chpid;
439                 /* Wait until previous actions have settled. */
440                 css_wait_for_slow_path();
441                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
442                                            &link);
443         }
444 }
445
446 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
447                                          struct chp_id chpid, int on)
448 {
449         unsigned long flags;
450         struct chp_link link;
451
452         memset(&link, 0, sizeof(struct chp_link));
453         link.chpid = chpid;
454         spin_lock_irqsave(sch->lock, flags);
455         if (sch->driver && sch->driver->chp_event)
456                 sch->driver->chp_event(sch, &link,
457                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
458         spin_unlock_irqrestore(sch->lock, flags);
459 }
460
461 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
462 {
463         struct chp_id *chpid = data;
464
465         __s390_subchannel_vary_chpid(sch, *chpid, 0);
466         return 0;
467 }
468
469 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
470 {
471         struct chp_id *chpid = data;
472
473         __s390_subchannel_vary_chpid(sch, *chpid, 1);
474         return 0;
475 }
476
477 static int
478 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
479 {
480         struct schib schib;
481
482         if (stsch_err(schid, &schib))
483                 /* We're through */
484                 return -ENXIO;
485         /* Put it on the slow path. */
486         css_schedule_eval(schid);
487         return 0;
488 }
489
490 /**
491  * chsc_chp_vary - propagate channel-path vary operation to subchannels
492  * @chpid: channl-path ID
493  * @on: non-zero for vary online, zero for vary offline
494  */
495 int chsc_chp_vary(struct chp_id chpid, int on)
496 {
497         struct chp_link link;
498
499         memset(&link, 0, sizeof(struct chp_link));
500         link.chpid = chpid;
501         /* Wait until previous actions have settled. */
502         css_wait_for_slow_path();
503         /*
504          * Redo PathVerification on the devices the chpid connects to
505          */
506
507         if (on)
508                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
509                                            __s390_vary_chpid_on, &link);
510         else
511                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
512                                            NULL, &link);
513
514         return 0;
515 }
516
517 static void
518 chsc_remove_cmg_attr(struct channel_subsystem *css)
519 {
520         int i;
521
522         for (i = 0; i <= __MAX_CHPID; i++) {
523                 if (!css->chps[i])
524                         continue;
525                 chp_remove_cmg_attr(css->chps[i]);
526         }
527 }
528
529 static int
530 chsc_add_cmg_attr(struct channel_subsystem *css)
531 {
532         int i, ret;
533
534         ret = 0;
535         for (i = 0; i <= __MAX_CHPID; i++) {
536                 if (!css->chps[i])
537                         continue;
538                 ret = chp_add_cmg_attr(css->chps[i]);
539                 if (ret)
540                         goto cleanup;
541         }
542         return ret;
543 cleanup:
544         for (--i; i >= 0; i--) {
545                 if (!css->chps[i])
546                         continue;
547                 chp_remove_cmg_attr(css->chps[i]);
548         }
549         return ret;
550 }
551
552 static int
553 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
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         secm_area = page;
575         secm_area->request.length = 0x0050;
576         secm_area->request.code = 0x0016;
577
578         secm_area->key = PAGE_DEFAULT_KEY;
579         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
580         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
581
582         secm_area->operation_code = enable ? 0 : 1;
583
584         ccode = chsc(secm_area);
585         if (ccode > 0)
586                 return (ccode == 3) ? -ENODEV : -EBUSY;
587
588         switch (secm_area->response.code) {
589         case 0x0102:
590         case 0x0103:
591                 ret = -EINVAL;
592                 break;
593         default:
594                 ret = chsc_error_from_response(secm_area->response.code);
595         }
596         if (ret != 0)
597                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
598                               secm_area->response.code);
599         return ret;
600 }
601
602 int
603 chsc_secm(struct channel_subsystem *css, int enable)
604 {
605         void  *secm_area;
606         int ret;
607
608         secm_area = (void *)get_zeroed_page(GFP_KERNEL |  GFP_DMA);
609         if (!secm_area)
610                 return -ENOMEM;
611
612         if (enable && !css->cm_enabled) {
613                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
614                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
615                 if (!css->cub_addr1 || !css->cub_addr2) {
616                         free_page((unsigned long)css->cub_addr1);
617                         free_page((unsigned long)css->cub_addr2);
618                         free_page((unsigned long)secm_area);
619                         return -ENOMEM;
620                 }
621         }
622         ret = __chsc_do_secm(css, enable, secm_area);
623         if (!ret) {
624                 css->cm_enabled = enable;
625                 if (css->cm_enabled) {
626                         ret = chsc_add_cmg_attr(css);
627                         if (ret) {
628                                 memset(secm_area, 0, PAGE_SIZE);
629                                 __chsc_do_secm(css, 0, secm_area);
630                                 css->cm_enabled = 0;
631                         }
632                 } else
633                         chsc_remove_cmg_attr(css);
634         }
635         if (!css->cm_enabled) {
636                 free_page((unsigned long)css->cub_addr1);
637                 free_page((unsigned long)css->cub_addr2);
638         }
639         free_page((unsigned long)secm_area);
640         return ret;
641 }
642
643 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
644                                      int c, int m,
645                                      struct chsc_response_struct *resp)
646 {
647         int ccode, ret;
648
649         struct {
650                 struct chsc_header request;
651                 u32 : 2;
652                 u32 m : 1;
653                 u32 c : 1;
654                 u32 fmt : 4;
655                 u32 cssid : 8;
656                 u32 : 4;
657                 u32 rfmt : 4;
658                 u32 first_chpid : 8;
659                 u32 : 24;
660                 u32 last_chpid : 8;
661                 u32 zeroes1;
662                 struct chsc_header response;
663                 u8 data[PAGE_SIZE - 20];
664         } __attribute__ ((packed)) *scpd_area;
665
666         if ((rfmt == 1) && !css_general_characteristics.fcs)
667                 return -EINVAL;
668         if ((rfmt == 2) && !css_general_characteristics.cib)
669                 return -EINVAL;
670         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
671         if (!scpd_area)
672                 return -ENOMEM;
673
674         scpd_area->request.length = 0x0010;
675         scpd_area->request.code = 0x0002;
676
677         scpd_area->cssid = chpid.cssid;
678         scpd_area->first_chpid = chpid.id;
679         scpd_area->last_chpid = chpid.id;
680         scpd_area->m = m;
681         scpd_area->c = c;
682         scpd_area->fmt = fmt;
683         scpd_area->rfmt = rfmt;
684
685         ccode = chsc(scpd_area);
686         if (ccode > 0) {
687                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
688                 goto out;
689         }
690
691         ret = chsc_error_from_response(scpd_area->response.code);
692         if (ret == 0)
693                 /* Success. */
694                 memcpy(resp, &scpd_area->response, scpd_area->response.length);
695         else
696                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
697                               scpd_area->response.code);
698 out:
699         free_page((unsigned long)scpd_area);
700         return ret;
701 }
702 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
703
704 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
705                                           struct channel_path_desc *desc)
706 {
707         struct chsc_response_struct *chsc_resp;
708         int ret;
709
710         chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL);
711         if (!chsc_resp)
712                 return -ENOMEM;
713         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
714         if (ret)
715                 goto out_free;
716         memcpy(desc, &chsc_resp->data, chsc_resp->length);
717 out_free:
718         kfree(chsc_resp);
719         return ret;
720 }
721
722 static void
723 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
724                           struct cmg_chars *chars)
725 {
726         switch (chp->cmg) {
727         case 2:
728         case 3:
729                 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
730                                          GFP_KERNEL);
731                 if (chp->cmg_chars) {
732                         int i, mask;
733                         struct cmg_chars *cmg_chars;
734
735                         cmg_chars = chp->cmg_chars;
736                         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
737                                 mask = 0x80 >> (i + 3);
738                                 if (cmcv & mask)
739                                         cmg_chars->values[i] = chars->values[i];
740                                 else
741                                         cmg_chars->values[i] = 0;
742                         }
743                 }
744                 break;
745         default:
746                 /* No cmg-dependent data. */
747                 break;
748         }
749 }
750
751 int chsc_get_channel_measurement_chars(struct channel_path *chp)
752 {
753         int ccode, ret;
754
755         struct {
756                 struct chsc_header request;
757                 u32 : 24;
758                 u32 first_chpid : 8;
759                 u32 : 24;
760                 u32 last_chpid : 8;
761                 u32 zeroes1;
762                 struct chsc_header response;
763                 u32 zeroes2;
764                 u32 not_valid : 1;
765                 u32 shared : 1;
766                 u32 : 22;
767                 u32 chpid : 8;
768                 u32 cmcv : 5;
769                 u32 : 11;
770                 u32 cmgq : 8;
771                 u32 cmg : 8;
772                 u32 zeroes3;
773                 u32 data[NR_MEASUREMENT_CHARS];
774         } __attribute__ ((packed)) *scmc_area;
775
776         scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
777         if (!scmc_area)
778                 return -ENOMEM;
779
780         scmc_area->request.length = 0x0010;
781         scmc_area->request.code = 0x0022;
782
783         scmc_area->first_chpid = chp->chpid.id;
784         scmc_area->last_chpid = chp->chpid.id;
785
786         ccode = chsc(scmc_area);
787         if (ccode > 0) {
788                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
789                 goto out;
790         }
791
792         ret = chsc_error_from_response(scmc_area->response.code);
793         if (ret == 0) {
794                 /* Success. */
795                 if (!scmc_area->not_valid) {
796                         chp->cmg = scmc_area->cmg;
797                         chp->shared = scmc_area->shared;
798                         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
799                                                   (struct cmg_chars *)
800                                                   &scmc_area->data);
801                 } else {
802                         chp->cmg = -1;
803                         chp->shared = -1;
804                 }
805         } else {
806                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
807                               scmc_area->response.code);
808         }
809 out:
810         free_page((unsigned long)scmc_area);
811         return ret;
812 }
813
814 int __init chsc_alloc_sei_area(void)
815 {
816         int ret;
817
818         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
819         if (!sei_page) {
820                 CIO_MSG_EVENT(0, "Can't allocate page for processing of "
821                               "chsc machine checks!\n");
822                 return -ENOMEM;
823         }
824         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
825         if (ret)
826                 kfree(sei_page);
827         return ret;
828 }
829
830 void __init chsc_free_sei_area(void)
831 {
832         crw_unregister_handler(CRW_RSC_CSS);
833         kfree(sei_page);
834 }
835
836 int __init
837 chsc_enable_facility(int operation_code)
838 {
839         int ret;
840         struct {
841                 struct chsc_header request;
842                 u8 reserved1:4;
843                 u8 format:4;
844                 u8 reserved2;
845                 u16 operation_code;
846                 u32 reserved3;
847                 u32 reserved4;
848                 u32 operation_data_area[252];
849                 struct chsc_header response;
850                 u32 reserved5:4;
851                 u32 format2:4;
852                 u32 reserved6:24;
853         } __attribute__ ((packed)) *sda_area;
854
855         sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
856         if (!sda_area)
857                 return -ENOMEM;
858         sda_area->request.length = 0x0400;
859         sda_area->request.code = 0x0031;
860         sda_area->operation_code = operation_code;
861
862         ret = chsc(sda_area);
863         if (ret > 0) {
864                 ret = (ret == 3) ? -ENODEV : -EBUSY;
865                 goto out;
866         }
867
868         switch (sda_area->response.code) {
869         case 0x0101:
870                 ret = -EOPNOTSUPP;
871                 break;
872         default:
873                 ret = chsc_error_from_response(sda_area->response.code);
874         }
875         if (ret != 0)
876                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
877                               operation_code, sda_area->response.code);
878  out:
879         free_page((unsigned long)sda_area);
880         return ret;
881 }
882
883 struct css_general_char css_general_characteristics;
884 struct css_chsc_char css_chsc_characteristics;
885
886 int __init
887 chsc_determine_css_characteristics(void)
888 {
889         int result;
890         struct {
891                 struct chsc_header request;
892                 u32 reserved1;
893                 u32 reserved2;
894                 u32 reserved3;
895                 struct chsc_header response;
896                 u32 reserved4;
897                 u32 general_char[510];
898                 u32 chsc_char[518];
899         } __attribute__ ((packed)) *scsc_area;
900
901         scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
902         if (!scsc_area)
903                 return -ENOMEM;
904
905         scsc_area->request.length = 0x0010;
906         scsc_area->request.code = 0x0010;
907
908         result = chsc(scsc_area);
909         if (result) {
910                 result = (result == 3) ? -ENODEV : -EBUSY;
911                 goto exit;
912         }
913
914         result = chsc_error_from_response(scsc_area->response.code);
915         if (result == 0) {
916                 memcpy(&css_general_characteristics, scsc_area->general_char,
917                        sizeof(css_general_characteristics));
918                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
919                        sizeof(css_chsc_characteristics));
920         } else
921                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
922                               scsc_area->response.code);
923 exit:
924         free_page ((unsigned long) scsc_area);
925         return result;
926 }
927
928 EXPORT_SYMBOL_GPL(css_general_characteristics);
929 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
930
931 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
932 {
933         struct {
934                 struct chsc_header request;
935                 unsigned int rsvd0;
936                 unsigned int op : 8;
937                 unsigned int rsvd1 : 8;
938                 unsigned int ctrl : 16;
939                 unsigned int rsvd2[5];
940                 struct chsc_header response;
941                 unsigned int rsvd3[7];
942         } __attribute__ ((packed)) *rr;
943         int rc;
944
945         memset(page, 0, PAGE_SIZE);
946         rr = page;
947         rr->request.length = 0x0020;
948         rr->request.code = 0x0033;
949         rr->op = op;
950         rr->ctrl = ctrl;
951         rc = chsc(rr);
952         if (rc)
953                 return -EIO;
954         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
955         return rc;
956 }
957
958 int chsc_sstpi(void *page, void *result, size_t size)
959 {
960         struct {
961                 struct chsc_header request;
962                 unsigned int rsvd0[3];
963                 struct chsc_header response;
964                 char data[size];
965         } __attribute__ ((packed)) *rr;
966         int rc;
967
968         memset(page, 0, PAGE_SIZE);
969         rr = page;
970         rr->request.length = 0x0010;
971         rr->request.code = 0x0038;
972         rc = chsc(rr);
973         if (rc)
974                 return -EIO;
975         memcpy(result, &rr->data, size);
976         return (rr->response.code == 0x0001) ? 0 : -EIO;
977 }
978