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