[S390] convert sclp printks to pr_xxx macros.
[linux-2.6.git] / drivers / s390 / char / sclp_cmd.c
1 /*
2  *  drivers/s390/char/sclp_cmd.c
3  *
4  *    Copyright IBM Corp. 2007
5  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6  *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
7  */
8
9 #define KMSG_COMPONENT "sclp_cmd"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/completion.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/mm.h>
18 #include <linux/mmzone.h>
19 #include <linux/memory.h>
20 #include <asm/chpid.h>
21 #include <asm/sclp.h>
22
23 #include "sclp.h"
24
25 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
26 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
27
28 struct read_info_sccb {
29         struct  sccb_header header;     /* 0-7 */
30         u16     rnmax;                  /* 8-9 */
31         u8      rnsize;                 /* 10 */
32         u8      _reserved0[24 - 11];    /* 11-15 */
33         u8      loadparm[8];            /* 24-31 */
34         u8      _reserved1[48 - 32];    /* 32-47 */
35         u64     facilities;             /* 48-55 */
36         u8      _reserved2[84 - 56];    /* 56-83 */
37         u8      fac84;                  /* 84 */
38         u8      _reserved3[91 - 85];    /* 85-90 */
39         u8      flags;                  /* 91 */
40         u8      _reserved4[100 - 92];   /* 92-99 */
41         u32     rnsize2;                /* 100-103 */
42         u64     rnmax2;                 /* 104-111 */
43         u8      _reserved5[4096 - 112]; /* 112-4095 */
44 } __attribute__((packed, aligned(PAGE_SIZE)));
45
46 static struct read_info_sccb __initdata early_read_info_sccb;
47 static int __initdata early_read_info_sccb_valid;
48
49 u64 sclp_facilities;
50 static u8 sclp_fac84;
51 static unsigned long long rzm;
52 static unsigned long long rnmax;
53
54 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
55 {
56         int rc;
57
58         __ctl_set_bit(0, 9);
59         rc = sclp_service_call(cmd, sccb);
60         if (rc)
61                 goto out;
62         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
63                         PSW_MASK_WAIT | PSW_DEFAULT_KEY);
64         local_irq_disable();
65 out:
66         /* Contents of the sccb might have changed. */
67         barrier();
68         __ctl_clear_bit(0, 9);
69         return rc;
70 }
71
72 static void __init sclp_read_info_early(void)
73 {
74         int rc;
75         int i;
76         struct read_info_sccb *sccb;
77         sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
78                                   SCLP_CMDW_READ_SCP_INFO};
79
80         sccb = &early_read_info_sccb;
81         for (i = 0; i < ARRAY_SIZE(commands); i++) {
82                 do {
83                         memset(sccb, 0, sizeof(*sccb));
84                         sccb->header.length = sizeof(*sccb);
85                         sccb->header.control_mask[2] = 0x80;
86                         rc = sclp_cmd_sync_early(commands[i], sccb);
87                 } while (rc == -EBUSY);
88
89                 if (rc)
90                         break;
91                 if (sccb->header.response_code == 0x10) {
92                         early_read_info_sccb_valid = 1;
93                         break;
94                 }
95                 if (sccb->header.response_code != 0x1f0)
96                         break;
97         }
98 }
99
100 void __init sclp_facilities_detect(void)
101 {
102         struct read_info_sccb *sccb;
103
104         sclp_read_info_early();
105         if (!early_read_info_sccb_valid)
106                 return;
107
108         sccb = &early_read_info_sccb;
109         sclp_facilities = sccb->facilities;
110         sclp_fac84 = sccb->fac84;
111         rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
112         rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
113         rzm <<= 20;
114 }
115
116 unsigned long long sclp_get_rnmax(void)
117 {
118         return rnmax;
119 }
120
121 unsigned long long sclp_get_rzm(void)
122 {
123         return rzm;
124 }
125
126 /*
127  * This function will be called after sclp_facilities_detect(), which gets
128  * called from early.c code. Therefore the sccb should have valid contents.
129  */
130 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
131 {
132         struct read_info_sccb *sccb;
133
134         if (!early_read_info_sccb_valid)
135                 return;
136         sccb = &early_read_info_sccb;
137         info->is_valid = 1;
138         if (sccb->flags & 0x2)
139                 info->has_dump = 1;
140         memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
141 }
142
143 static void sclp_sync_callback(struct sclp_req *req, void *data)
144 {
145         struct completion *completion = data;
146
147         complete(completion);
148 }
149
150 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
151 {
152         struct completion completion;
153         struct sclp_req *request;
154         int rc;
155
156         request = kzalloc(sizeof(*request), GFP_KERNEL);
157         if (!request)
158                 return -ENOMEM;
159         request->command = cmd;
160         request->sccb = sccb;
161         request->status = SCLP_REQ_FILLED;
162         request->callback = sclp_sync_callback;
163         request->callback_data = &completion;
164         init_completion(&completion);
165
166         /* Perform sclp request. */
167         rc = sclp_add_request(request);
168         if (rc)
169                 goto out;
170         wait_for_completion(&completion);
171
172         /* Check response. */
173         if (request->status != SCLP_REQ_DONE) {
174                 pr_warning("sync request failed (cmd=0x%08x, "
175                            "status=0x%02x)\n", cmd, request->status);
176                 rc = -EIO;
177         }
178 out:
179         kfree(request);
180         return rc;
181 }
182
183 /*
184  * CPU configuration related functions.
185  */
186
187 #define SCLP_CMDW_READ_CPU_INFO         0x00010001
188 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
189 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
190
191 struct read_cpu_info_sccb {
192         struct  sccb_header header;
193         u16     nr_configured;
194         u16     offset_configured;
195         u16     nr_standby;
196         u16     offset_standby;
197         u8      reserved[4096 - 16];
198 } __attribute__((packed, aligned(PAGE_SIZE)));
199
200 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
201                                struct read_cpu_info_sccb *sccb)
202 {
203         char *page = (char *) sccb;
204
205         memset(info, 0, sizeof(*info));
206         info->configured = sccb->nr_configured;
207         info->standby = sccb->nr_standby;
208         info->combined = sccb->nr_configured + sccb->nr_standby;
209         info->has_cpu_type = sclp_fac84 & 0x1;
210         memcpy(&info->cpu, page + sccb->offset_configured,
211                info->combined * sizeof(struct sclp_cpu_entry));
212 }
213
214 int sclp_get_cpu_info(struct sclp_cpu_info *info)
215 {
216         int rc;
217         struct read_cpu_info_sccb *sccb;
218
219         if (!SCLP_HAS_CPU_INFO)
220                 return -EOPNOTSUPP;
221         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
222         if (!sccb)
223                 return -ENOMEM;
224         sccb->header.length = sizeof(*sccb);
225         rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
226         if (rc)
227                 goto out;
228         if (sccb->header.response_code != 0x0010) {
229                 pr_warning("readcpuinfo failed (response=0x%04x)\n",
230                            sccb->header.response_code);
231                 rc = -EIO;
232                 goto out;
233         }
234         sclp_fill_cpu_info(info, sccb);
235 out:
236         free_page((unsigned long) sccb);
237         return rc;
238 }
239
240 struct cpu_configure_sccb {
241         struct sccb_header header;
242 } __attribute__((packed, aligned(8)));
243
244 static int do_cpu_configure(sclp_cmdw_t cmd)
245 {
246         struct cpu_configure_sccb *sccb;
247         int rc;
248
249         if (!SCLP_HAS_CPU_RECONFIG)
250                 return -EOPNOTSUPP;
251         /*
252          * This is not going to cross a page boundary since we force
253          * kmalloc to have a minimum alignment of 8 bytes on s390.
254          */
255         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
256         if (!sccb)
257                 return -ENOMEM;
258         sccb->header.length = sizeof(*sccb);
259         rc = do_sync_request(cmd, sccb);
260         if (rc)
261                 goto out;
262         switch (sccb->header.response_code) {
263         case 0x0020:
264         case 0x0120:
265                 break;
266         default:
267                 pr_warning("configure cpu failed (cmd=0x%08x, "
268                            "response=0x%04x)\n", cmd,
269                            sccb->header.response_code);
270                 rc = -EIO;
271                 break;
272         }
273 out:
274         kfree(sccb);
275         return rc;
276 }
277
278 int sclp_cpu_configure(u8 cpu)
279 {
280         return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
281 }
282
283 int sclp_cpu_deconfigure(u8 cpu)
284 {
285         return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
286 }
287
288 #ifdef CONFIG_MEMORY_HOTPLUG
289
290 static DEFINE_MUTEX(sclp_mem_mutex);
291 static LIST_HEAD(sclp_mem_list);
292 static u8 sclp_max_storage_id;
293 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
294
295 struct memory_increment {
296         struct list_head list;
297         u16 rn;
298         int standby;
299         int usecount;
300 };
301
302 struct assign_storage_sccb {
303         struct sccb_header header;
304         u16 rn;
305 } __packed;
306
307 static unsigned long long rn2addr(u16 rn)
308 {
309         return (unsigned long long) (rn - 1) * rzm;
310 }
311
312 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
313 {
314         struct assign_storage_sccb *sccb;
315         int rc;
316
317         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
318         if (!sccb)
319                 return -ENOMEM;
320         sccb->header.length = PAGE_SIZE;
321         sccb->rn = rn;
322         rc = do_sync_request(cmd, sccb);
323         if (rc)
324                 goto out;
325         switch (sccb->header.response_code) {
326         case 0x0020:
327         case 0x0120:
328                 break;
329         default:
330                 pr_warning("assign storage failed (cmd=0x%08x, "
331                            "response=0x%04x, rn=0x%04x)\n", cmd,
332                            sccb->header.response_code, rn);
333                 rc = -EIO;
334                 break;
335         }
336 out:
337         free_page((unsigned long) sccb);
338         return rc;
339 }
340
341 static int sclp_assign_storage(u16 rn)
342 {
343         return do_assign_storage(0x000d0001, rn);
344 }
345
346 static int sclp_unassign_storage(u16 rn)
347 {
348         return do_assign_storage(0x000c0001, rn);
349 }
350
351 struct attach_storage_sccb {
352         struct sccb_header header;
353         u16 :16;
354         u16 assigned;
355         u32 :32;
356         u32 entries[0];
357 } __packed;
358
359 static int sclp_attach_storage(u8 id)
360 {
361         struct attach_storage_sccb *sccb;
362         int rc;
363         int i;
364
365         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
366         if (!sccb)
367                 return -ENOMEM;
368         sccb->header.length = PAGE_SIZE;
369         rc = do_sync_request(0x00080001 | id << 8, sccb);
370         if (rc)
371                 goto out;
372         switch (sccb->header.response_code) {
373         case 0x0020:
374                 set_bit(id, sclp_storage_ids);
375                 for (i = 0; i < sccb->assigned; i++)
376                         sclp_unassign_storage(sccb->entries[i] >> 16);
377                 break;
378         default:
379                 rc = -EIO;
380                 break;
381         }
382 out:
383         free_page((unsigned long) sccb);
384         return rc;
385 }
386
387 static int sclp_mem_change_state(unsigned long start, unsigned long size,
388                                  int online)
389 {
390         struct memory_increment *incr;
391         unsigned long long istart;
392         int rc = 0;
393
394         list_for_each_entry(incr, &sclp_mem_list, list) {
395                 istart = rn2addr(incr->rn);
396                 if (start + size - 1 < istart)
397                         break;
398                 if (start > istart + rzm - 1)
399                         continue;
400                 if (online) {
401                         if (incr->usecount++)
402                                 continue;
403                         /*
404                          * Don't break the loop if one assign fails. Loop may
405                          * be walked again on CANCEL and we can't save
406                          * information if state changed before or not.
407                          * So continue and increase usecount for all increments.
408                          */
409                         rc |= sclp_assign_storage(incr->rn);
410                 } else {
411                         if (--incr->usecount)
412                                 continue;
413                         sclp_unassign_storage(incr->rn);
414                 }
415         }
416         return rc ? -EIO : 0;
417 }
418
419 static int sclp_mem_notifier(struct notifier_block *nb,
420                              unsigned long action, void *data)
421 {
422         unsigned long start, size;
423         struct memory_notify *arg;
424         unsigned char id;
425         int rc = 0;
426
427         arg = data;
428         start = arg->start_pfn << PAGE_SHIFT;
429         size = arg->nr_pages << PAGE_SHIFT;
430         mutex_lock(&sclp_mem_mutex);
431         for (id = 0; id <= sclp_max_storage_id; id++)
432                 if (!test_bit(id, sclp_storage_ids))
433                         sclp_attach_storage(id);
434         switch (action) {
435         case MEM_ONLINE:
436         case MEM_GOING_OFFLINE:
437         case MEM_CANCEL_OFFLINE:
438                 break;
439         case MEM_GOING_ONLINE:
440                 rc = sclp_mem_change_state(start, size, 1);
441                 break;
442         case MEM_CANCEL_ONLINE:
443                 sclp_mem_change_state(start, size, 0);
444                 break;
445         case MEM_OFFLINE:
446                 sclp_mem_change_state(start, size, 0);
447                 break;
448         default:
449                 rc = -EINVAL;
450                 break;
451         }
452         mutex_unlock(&sclp_mem_mutex);
453         return rc ? NOTIFY_BAD : NOTIFY_OK;
454 }
455
456 static struct notifier_block sclp_mem_nb = {
457         .notifier_call = sclp_mem_notifier,
458 };
459
460 static void __init add_memory_merged(u16 rn)
461 {
462         static u16 first_rn, num;
463         unsigned long long start, size;
464
465         if (rn && first_rn && (first_rn + num == rn)) {
466                 num++;
467                 return;
468         }
469         if (!first_rn)
470                 goto skip_add;
471         start = rn2addr(first_rn);
472         size = (unsigned long long ) num * rzm;
473         if (start >= VMEM_MAX_PHYS)
474                 goto skip_add;
475         if (start + size > VMEM_MAX_PHYS)
476                 size = VMEM_MAX_PHYS - start;
477         add_memory(0, start, size);
478 skip_add:
479         first_rn = rn;
480         num = 1;
481 }
482
483 static void __init sclp_add_standby_memory(void)
484 {
485         struct memory_increment *incr;
486
487         list_for_each_entry(incr, &sclp_mem_list, list)
488                 if (incr->standby)
489                         add_memory_merged(incr->rn);
490         add_memory_merged(0);
491 }
492
493 static void __init insert_increment(u16 rn, int standby, int assigned)
494 {
495         struct memory_increment *incr, *new_incr;
496         struct list_head *prev;
497         u16 last_rn;
498
499         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
500         if (!new_incr)
501                 return;
502         new_incr->rn = rn;
503         new_incr->standby = standby;
504         last_rn = 0;
505         prev = &sclp_mem_list;
506         list_for_each_entry(incr, &sclp_mem_list, list) {
507                 if (assigned && incr->rn > rn)
508                         break;
509                 if (!assigned && incr->rn - last_rn > 1)
510                         break;
511                 last_rn = incr->rn;
512                 prev = &incr->list;
513         }
514         if (!assigned)
515                 new_incr->rn = last_rn + 1;
516         if (new_incr->rn > rnmax) {
517                 kfree(new_incr);
518                 return;
519         }
520         list_add(&new_incr->list, prev);
521 }
522
523 struct read_storage_sccb {
524         struct sccb_header header;
525         u16 max_id;
526         u16 assigned;
527         u16 standby;
528         u16 :16;
529         u32 entries[0];
530 } __packed;
531
532 static int __init sclp_detect_standby_memory(void)
533 {
534         struct read_storage_sccb *sccb;
535         int i, id, assigned, rc;
536
537         if (!early_read_info_sccb_valid)
538                 return 0;
539         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
540                 return 0;
541         rc = -ENOMEM;
542         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
543         if (!sccb)
544                 goto out;
545         assigned = 0;
546         for (id = 0; id <= sclp_max_storage_id; id++) {
547                 memset(sccb, 0, PAGE_SIZE);
548                 sccb->header.length = PAGE_SIZE;
549                 rc = do_sync_request(0x00040001 | id << 8, sccb);
550                 if (rc)
551                         goto out;
552                 switch (sccb->header.response_code) {
553                 case 0x0010:
554                         set_bit(id, sclp_storage_ids);
555                         for (i = 0; i < sccb->assigned; i++) {
556                                 if (!sccb->entries[i])
557                                         continue;
558                                 assigned++;
559                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
560                         }
561                         break;
562                 case 0x0310:
563                         break;
564                 case 0x0410:
565                         for (i = 0; i < sccb->assigned; i++) {
566                                 if (!sccb->entries[i])
567                                         continue;
568                                 assigned++;
569                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
570                         }
571                         break;
572                 default:
573                         rc = -EIO;
574                         break;
575                 }
576                 if (!rc)
577                         sclp_max_storage_id = sccb->max_id;
578         }
579         if (rc || list_empty(&sclp_mem_list))
580                 goto out;
581         for (i = 1; i <= rnmax - assigned; i++)
582                 insert_increment(0, 1, 0);
583         rc = register_memory_notifier(&sclp_mem_nb);
584         if (rc)
585                 goto out;
586         sclp_add_standby_memory();
587 out:
588         free_page((unsigned long) sccb);
589         return rc;
590 }
591 __initcall(sclp_detect_standby_memory);
592
593 #endif /* CONFIG_MEMORY_HOTPLUG */
594
595 /*
596  * Channel path configuration related functions.
597  */
598
599 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
600 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
601 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
602
603 struct chp_cfg_sccb {
604         struct sccb_header header;
605         u8 ccm;
606         u8 reserved[6];
607         u8 cssid;
608 } __attribute__((packed));
609
610 static int do_chp_configure(sclp_cmdw_t cmd)
611 {
612         struct chp_cfg_sccb *sccb;
613         int rc;
614
615         if (!SCLP_HAS_CHP_RECONFIG)
616                 return -EOPNOTSUPP;
617         /* Prepare sccb. */
618         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
619         if (!sccb)
620                 return -ENOMEM;
621         sccb->header.length = sizeof(*sccb);
622         rc = do_sync_request(cmd, sccb);
623         if (rc)
624                 goto out;
625         switch (sccb->header.response_code) {
626         case 0x0020:
627         case 0x0120:
628         case 0x0440:
629         case 0x0450:
630                 break;
631         default:
632                 pr_warning("configure channel-path failed "
633                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
634                            sccb->header.response_code);
635                 rc = -EIO;
636                 break;
637         }
638 out:
639         free_page((unsigned long) sccb);
640         return rc;
641 }
642
643 /**
644  * sclp_chp_configure - perform configure channel-path sclp command
645  * @chpid: channel-path ID
646  *
647  * Perform configure channel-path command sclp command for specified chpid.
648  * Return 0 after command successfully finished, non-zero otherwise.
649  */
650 int sclp_chp_configure(struct chp_id chpid)
651 {
652         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
653 }
654
655 /**
656  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
657  * @chpid: channel-path ID
658  *
659  * Perform deconfigure channel-path command sclp command for specified chpid
660  * and wait for completion. On success return 0. Return non-zero otherwise.
661  */
662 int sclp_chp_deconfigure(struct chp_id chpid)
663 {
664         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
665 }
666
667 struct chp_info_sccb {
668         struct sccb_header header;
669         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
670         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
671         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
672         u8 ccm;
673         u8 reserved[6];
674         u8 cssid;
675 } __attribute__((packed));
676
677 /**
678  * sclp_chp_read_info - perform read channel-path information sclp command
679  * @info: resulting channel-path information data
680  *
681  * Perform read channel-path information sclp command and wait for completion.
682  * On success, store channel-path information in @info and return 0. Return
683  * non-zero otherwise.
684  */
685 int sclp_chp_read_info(struct sclp_chp_info *info)
686 {
687         struct chp_info_sccb *sccb;
688         int rc;
689
690         if (!SCLP_HAS_CHP_INFO)
691                 return -EOPNOTSUPP;
692         /* Prepare sccb. */
693         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
694         if (!sccb)
695                 return -ENOMEM;
696         sccb->header.length = sizeof(*sccb);
697         rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
698         if (rc)
699                 goto out;
700         if (sccb->header.response_code != 0x0010) {
701                 pr_warning("read channel-path info failed "
702                            "(response=0x%04x)\n", sccb->header.response_code);
703                 rc = -EIO;
704                 goto out;
705         }
706         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
707         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
708         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
709 out:
710         free_page((unsigned long) sccb);
711         return rc;
712 }