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