drivers/s390/char/sclp_cmd.c

   1 /*
   2  * Copyright IBM Corp. 2007,2012
   3  *
   4  * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
   5  *            Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   6  */
   7
   8 #define KMSG_COMPONENT "sclp_cmd"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/completion.h>
  12 #include <linux/init.h>
  13 #include <linux/errno.h>
  14 #include <linux/err.h>
  15 #include <linux/export.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/mmzone.h>
  20 #include <linux/memory.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <asm/ctl_reg.h>
  24 #include <asm/chpid.h>
  25 #include <asm/setup.h>
  26 #include <asm/page.h>
  27 #include <asm/sclp.h>
  28
  29 #include "sclp.h"
  30
  31 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
  32 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
  33
  34 struct read_info_sccb {
  35         struct  sccb_header header;     /* 0-7 */
  36         u16     rnmax;                  /* 8-9 */
  37         u8      rnsize;                 /* 10 */
  38         u8      _reserved0[24 - 11];    /* 11-15 */
  39         u8      loadparm[8];            /* 24-31 */
  40         u8      _reserved1[48 - 32];    /* 32-47 */
  41         u64     facilities;             /* 48-55 */
  42         u8      _reserved2[84 - 56];    /* 56-83 */
  43         u8      fac84;                  /* 84 */
  44         u8      fac85;                  /* 85 */
  45         u8      _reserved3[91 - 86];    /* 86-90 */
  46         u8      flags;                  /* 91 */
  47         u8      _reserved4[100 - 92];   /* 92-99 */
  48         u32     rnsize2;                /* 100-103 */
  49         u64     rnmax2;                 /* 104-111 */
  50         u8      _reserved5[4096 - 112]; /* 112-4095 */
  51 } __attribute__((packed, aligned(PAGE_SIZE)));
  52
  53 static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE);
  54 static struct read_info_sccb __initdata early_read_info_sccb;
  55 static int __initdata early_read_info_sccb_valid;
  56
  57 u64 sclp_facilities;
  58 static u8 sclp_fac84;
  59 static unsigned long long rzm;
  60 static unsigned long long rnmax;
  61
  62 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
  63 {
  64         int rc;
  65
  66         __ctl_set_bit(0, 9);
  67         rc = sclp_service_call(cmd, sccb);
  68         if (rc)
  69                 goto out;
  70         __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
  71                         PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
  72         local_irq_disable();
  73 out:
  74         /* Contents of the sccb might have changed. */
  75         barrier();
  76         __ctl_clear_bit(0, 9);
  77         return rc;
  78 }
  79
  80 static void __init sclp_read_info_early(void)
  81 {
  82         int rc;
  83         int i;
  84         struct read_info_sccb *sccb;
  85         sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
  86                                   SCLP_CMDW_READ_SCP_INFO};
  87
  88         sccb = &early_read_info_sccb;
  89         for (i = 0; i < ARRAY_SIZE(commands); i++) {
  90                 do {
  91                         memset(sccb, 0, sizeof(*sccb));
  92                         sccb->header.length = sizeof(*sccb);
  93                         sccb->header.function_code = 0x80;
  94                         sccb->header.control_mask[2] = 0x80;
  95                         rc = sclp_cmd_sync_early(commands[i], sccb);
  96                 } while (rc == -EBUSY);
  97
  98                 if (rc)
  99                         break;
 100                 if (sccb->header.response_code == 0x10) {
 101                         early_read_info_sccb_valid = 1;
 102                         break;
 103                 }
 104                 if (sccb->header.response_code != 0x1f0)
 105                         break;
 106         }
 107 }
 108
 109 static void __init sclp_event_mask_early(void)
 110 {
 111         struct init_sccb *sccb = &early_event_mask_sccb;
 112         int rc;
 113
 114         do {
 115                 memset(sccb, 0, sizeof(*sccb));
 116                 sccb->header.length = sizeof(*sccb);
 117                 sccb->mask_length = sizeof(sccb_mask_t);
 118                 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
 119         } while (rc == -EBUSY);
 120 }
 121
 122 void __init sclp_facilities_detect(void)
 123 {
 124         struct read_info_sccb *sccb;
 125
 126         sclp_read_info_early();
 127         if (!early_read_info_sccb_valid)
 128                 return;
 129
 130         sccb = &early_read_info_sccb;
 131         sclp_facilities = sccb->facilities;
 132         sclp_fac84 = sccb->fac84;
 133         if (sccb->fac85 & 0x02)
 134                 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
 135         rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 136         rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 137         rzm <<= 20;
 138
 139         sclp_event_mask_early();
 140 }
 141
 142 bool __init sclp_has_linemode(void)
 143 {
 144         struct init_sccb *sccb = &early_event_mask_sccb;
 145
 146         if (sccb->header.response_code != 0x20)
 147                 return 0;
 148         if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))
 149                 return 1;
 150         return 0;
 151 }
 152
 153 bool __init sclp_has_vt220(void)
 154 {
 155         struct init_sccb *sccb = &early_event_mask_sccb;
 156
 157         if (sccb->header.response_code != 0x20)
 158                 return 0;
 159         if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
 160                 return 1;
 161         return 0;
 162 }
 163
 164 unsigned long long sclp_get_rnmax(void)
 165 {
 166         return rnmax;
 167 }
 168
 169 unsigned long long sclp_get_rzm(void)
 170 {
 171         return rzm;
 172 }
 173
 174 /*
 175  * This function will be called after sclp_facilities_detect(), which gets
 176  * called from early.c code. Therefore the sccb should have valid contents.
 177  */
 178 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
 179 {
 180         struct read_info_sccb *sccb;
 181
 182         if (!early_read_info_sccb_valid)
 183                 return;
 184         sccb = &early_read_info_sccb;
 185         info->is_valid = 1;
 186         if (sccb->flags & 0x2)
 187                 info->has_dump = 1;
 188         memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
 189 }
 190
 191 static void sclp_sync_callback(struct sclp_req *req, void *data)
 192 {
 193         struct completion *completion = data;
 194
 195         complete(completion);
 196 }
 197
 198 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
 199 {
 200         struct completion completion;
 201         struct sclp_req *request;
 202         int rc;
 203
 204         request = kzalloc(sizeof(*request), GFP_KERNEL);
 205         if (!request)
 206                 return -ENOMEM;
 207         request->command = cmd;
 208         request->sccb = sccb;
 209         request->status = SCLP_REQ_FILLED;
 210         request->callback = sclp_sync_callback;
 211         request->callback_data = &completion;
 212         init_completion(&completion);
 213
 214         /* Perform sclp request. */
 215         rc = sclp_add_request(request);
 216         if (rc)
 217                 goto out;
 218         wait_for_completion(&completion);
 219
 220         /* Check response. */
 221         if (request->status != SCLP_REQ_DONE) {
 222                 pr_warning("sync request failed (cmd=0x%08x, "
 223                            "status=0x%02x)\n", cmd, request->status);
 224                 rc = -EIO;
 225         }
 226 out:
 227         kfree(request);
 228         return rc;
 229 }
 230
 231 /*
 232  * CPU configuration related functions.
 233  */
 234
 235 #define SCLP_CMDW_READ_CPU_INFO         0x00010001
 236 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
 237 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
 238
 239 struct read_cpu_info_sccb {
 240         struct  sccb_header header;
 241         u16     nr_configured;
 242         u16     offset_configured;
 243         u16     nr_standby;
 244         u16     offset_standby;
 245         u8      reserved[4096 - 16];
 246 } __attribute__((packed, aligned(PAGE_SIZE)));
 247
 248 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
 249                                struct read_cpu_info_sccb *sccb)
 250 {
 251         char *page = (char *) sccb;
 252
 253         memset(info, 0, sizeof(*info));
 254         info->configured = sccb->nr_configured;
 255         info->standby = sccb->nr_standby;
 256         info->combined = sccb->nr_configured + sccb->nr_standby;
 257         info->has_cpu_type = sclp_fac84 & 0x1;
 258         memcpy(&info->cpu, page + sccb->offset_configured,
 259                info->combined * sizeof(struct sclp_cpu_entry));
 260 }
 261
 262 int sclp_get_cpu_info(struct sclp_cpu_info *info)
 263 {
 264         int rc;
 265         struct read_cpu_info_sccb *sccb;
 266
 267         if (!SCLP_HAS_CPU_INFO)
 268                 return -EOPNOTSUPP;
 269         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 270         if (!sccb)
 271                 return -ENOMEM;
 272         sccb->header.length = sizeof(*sccb);
 273         rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
 274         if (rc)
 275                 goto out;
 276         if (sccb->header.response_code != 0x0010) {
 277                 pr_warning("readcpuinfo failed (response=0x%04x)\n",
 278                            sccb->header.response_code);
 279                 rc = -EIO;
 280                 goto out;
 281         }
 282         sclp_fill_cpu_info(info, sccb);
 283 out:
 284         free_page((unsigned long) sccb);
 285         return rc;
 286 }
 287
 288 struct cpu_configure_sccb {
 289         struct sccb_header header;
 290 } __attribute__((packed, aligned(8)));
 291
 292 static int do_cpu_configure(sclp_cmdw_t cmd)
 293 {
 294         struct cpu_configure_sccb *sccb;
 295         int rc;
 296
 297         if (!SCLP_HAS_CPU_RECONFIG)
 298                 return -EOPNOTSUPP;
 299         /*
 300          * This is not going to cross a page boundary since we force
 301          * kmalloc to have a minimum alignment of 8 bytes on s390.
 302          */
 303         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 304         if (!sccb)
 305                 return -ENOMEM;
 306         sccb->header.length = sizeof(*sccb);
 307         rc = do_sync_request(cmd, sccb);
 308         if (rc)
 309                 goto out;
 310         switch (sccb->header.response_code) {
 311         case 0x0020:
 312         case 0x0120:
 313                 break;
 314         default:
 315                 pr_warning("configure cpu failed (cmd=0x%08x, "
 316                            "response=0x%04x)\n", cmd,
 317                            sccb->header.response_code);
 318                 rc = -EIO;
 319                 break;
 320         }
 321 out:
 322         kfree(sccb);
 323         return rc;
 324 }
 325
 326 int sclp_cpu_configure(u8 cpu)
 327 {
 328         return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
 329 }
 330
 331 int sclp_cpu_deconfigure(u8 cpu)
 332 {
 333         return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
 334 }
 335
 336 #ifdef CONFIG_MEMORY_HOTPLUG
 337
 338 static DEFINE_MUTEX(sclp_mem_mutex);
 339 static LIST_HEAD(sclp_mem_list);
 340 static u8 sclp_max_storage_id;
 341 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
 342 static int sclp_mem_state_changed;
 343
 344 struct memory_increment {
 345         struct list_head list;
 346         u16 rn;
 347         int standby;
 348         int usecount;
 349 };
 350
 351 struct assign_storage_sccb {
 352         struct sccb_header header;
 353         u16 rn;
 354 } __packed;
 355
 356 int arch_get_memory_phys_device(unsigned long start_pfn)
 357 {
 358         if (!rzm)
 359                 return 0;
 360         return PFN_PHYS(start_pfn) >> ilog2(rzm);
 361 }
 362
 363 static unsigned long long rn2addr(u16 rn)
 364 {
 365         return (unsigned long long) (rn - 1) * rzm;
 366 }
 367
 368 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 369 {
 370         struct assign_storage_sccb *sccb;
 371         int rc;
 372
 373         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 374         if (!sccb)
 375                 return -ENOMEM;
 376         sccb->header.length = PAGE_SIZE;
 377         sccb->rn = rn;
 378         rc = do_sync_request(cmd, sccb);
 379         if (rc)
 380                 goto out;
 381         switch (sccb->header.response_code) {
 382         case 0x0020:
 383         case 0x0120:
 384                 break;
 385         default:
 386                 pr_warning("assign storage failed (cmd=0x%08x, "
 387                            "response=0x%04x, rn=0x%04x)\n", cmd,
 388                            sccb->header.response_code, rn);
 389                 rc = -EIO;
 390                 break;
 391         }
 392 out:
 393         free_page((unsigned long) sccb);
 394         return rc;
 395 }
 396
 397 static int sclp_assign_storage(u16 rn)
 398 {
 399         unsigned long long start;
 400         int rc;
 401
 402         rc = do_assign_storage(0x000d0001, rn);
 403         if (rc)
 404                 return rc;
 405         start = rn2addr(rn);
 406         storage_key_init_range(start, start + rzm);
 407         return 0;
 408 }
 409
 410 static int sclp_unassign_storage(u16 rn)
 411 {
 412         return do_assign_storage(0x000c0001, rn);
 413 }
 414
 415 struct attach_storage_sccb {
 416         struct sccb_header header;
 417         u16 :16;
 418         u16 assigned;
 419         u32 :32;
 420         u32 entries[0];
 421 } __packed;
 422
 423 static int sclp_attach_storage(u8 id)
 424 {
 425         struct attach_storage_sccb *sccb;
 426         int rc;
 427         int i;
 428
 429         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 430         if (!sccb)
 431                 return -ENOMEM;
 432         sccb->header.length = PAGE_SIZE;
 433         rc = do_sync_request(0x00080001 | id << 8, sccb);
 434         if (rc)
 435                 goto out;
 436         switch (sccb->header.response_code) {
 437         case 0x0020:
 438                 set_bit(id, sclp_storage_ids);
 439                 for (i = 0; i < sccb->assigned; i++) {
 440                         if (sccb->entries[i])
 441                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 442                 }
 443                 break;
 444         default:
 445                 rc = -EIO;
 446                 break;
 447         }
 448 out:
 449         free_page((unsigned long) sccb);
 450         return rc;
 451 }
 452
 453 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 454                                  int online)
 455 {
 456         struct memory_increment *incr;
 457         unsigned long long istart;
 458         int rc = 0;
 459
 460         list_for_each_entry(incr, &sclp_mem_list, list) {
 461                 istart = rn2addr(incr->rn);
 462                 if (start + size - 1 < istart)
 463                         break;
 464                 if (start > istart + rzm - 1)
 465                         continue;
 466                 if (online) {
 467                         if (incr->usecount++)
 468                                 continue;
 469                         /*
 470                          * Don't break the loop if one assign fails. Loop may
 471                          * be walked again on CANCEL and we can't save
 472                          * information if state changed before or not.
 473                          * So continue and increase usecount for all increments.
 474                          */
 475                         rc |= sclp_assign_storage(incr->rn);
 476                 } else {
 477                         if (--incr->usecount)
 478                                 continue;
 479                         sclp_unassign_storage(incr->rn);
 480                 }
 481         }
 482         return rc ? -EIO : 0;
 483 }
 484
 485 static int sclp_mem_notifier(struct notifier_block *nb,
 486                              unsigned long action, void *data)
 487 {
 488         unsigned long start, size;
 489         struct memory_notify *arg;
 490         unsigned char id;
 491         int rc = 0;
 492
 493         arg = data;
 494         start = arg->start_pfn << PAGE_SHIFT;
 495         size = arg->nr_pages << PAGE_SHIFT;
 496         mutex_lock(&sclp_mem_mutex);
 497         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 498                 sclp_attach_storage(id);
 499         switch (action) {
 500         case MEM_ONLINE:
 501         case MEM_GOING_OFFLINE:
 502         case MEM_CANCEL_OFFLINE:
 503                 break;
 504         case MEM_GOING_ONLINE:
 505                 rc = sclp_mem_change_state(start, size, 1);
 506                 break;
 507         case MEM_CANCEL_ONLINE:
 508                 sclp_mem_change_state(start, size, 0);
 509                 break;
 510         case MEM_OFFLINE:
 511                 sclp_mem_change_state(start, size, 0);
 512                 break;
 513         default:
 514                 rc = -EINVAL;
 515                 break;
 516         }
 517         if (!rc)
 518                 sclp_mem_state_changed = 1;
 519         mutex_unlock(&sclp_mem_mutex);
 520         return rc ? NOTIFY_BAD : NOTIFY_OK;
 521 }
 522
 523 static struct notifier_block sclp_mem_nb = {
 524         .notifier_call = sclp_mem_notifier,
 525 };
 526
 527 static void __init add_memory_merged(u16 rn)
 528 {
 529         static u16 first_rn, num;
 530         unsigned long long start, size;
 531
 532         if (rn && first_rn && (first_rn + num == rn)) {
 533                 num++;
 534                 return;
 535         }
 536         if (!first_rn)
 537                 goto skip_add;
 538         start = rn2addr(first_rn);
 539         size = (unsigned long long ) num * rzm;
 540         if (start >= VMEM_MAX_PHYS)
 541                 goto skip_add;
 542         if (start + size > VMEM_MAX_PHYS)
 543                 size = VMEM_MAX_PHYS - start;
 544         if (memory_end_set && (start >= memory_end))
 545                 goto skip_add;
 546         if (memory_end_set && (start + size > memory_end))
 547                 size = memory_end - start;
 548         add_memory(0, start, size);
 549 skip_add:
 550         first_rn = rn;
 551         num = 1;
 552 }
 553
 554 static void __init sclp_add_standby_memory(void)
 555 {
 556         struct memory_increment *incr;
 557
 558         list_for_each_entry(incr, &sclp_mem_list, list)
 559                 if (incr->standby)
 560                         add_memory_merged(incr->rn);
 561         add_memory_merged(0);
 562 }
 563
 564 static void __init insert_increment(u16 rn, int standby, int assigned)
 565 {
 566         struct memory_increment *incr, *new_incr;
 567         struct list_head *prev;
 568         u16 last_rn;
 569
 570         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 571         if (!new_incr)
 572                 return;
 573         new_incr->rn = rn;
 574         new_incr->standby = standby;
 575         if (!standby)
 576                 new_incr->usecount = 1;
 577         last_rn = 0;
 578         prev = &sclp_mem_list;
 579         list_for_each_entry(incr, &sclp_mem_list, list) {
 580                 if (assigned && incr->rn > rn)
 581                         break;
 582                 if (!assigned && incr->rn - last_rn > 1)
 583                         break;
 584                 last_rn = incr->rn;
 585                 prev = &incr->list;
 586         }
 587         if (!assigned)
 588                 new_incr->rn = last_rn + 1;
 589         if (new_incr->rn > rnmax) {
 590                 kfree(new_incr);
 591                 return;
 592         }
 593         list_add(&new_incr->list, prev);
 594 }
 595
 596 static int sclp_mem_freeze(struct device *dev)
 597 {
 598         if (!sclp_mem_state_changed)
 599                 return 0;
 600         pr_err("Memory hotplug state changed, suspend refused.\n");
 601         return -EPERM;
 602 }
 603
 604 struct read_storage_sccb {
 605         struct sccb_header header;
 606         u16 max_id;
 607         u16 assigned;
 608         u16 standby;
 609         u16 :16;
 610         u32 entries[0];
 611 } __packed;
 612
 613 static const struct dev_pm_ops sclp_mem_pm_ops = {
 614         .freeze         = sclp_mem_freeze,
 615 };
 616
 617 static struct platform_driver sclp_mem_pdrv = {
 618         .driver = {
 619                 .name   = "sclp_mem",
 620                 .pm     = &sclp_mem_pm_ops,
 621         },
 622 };
 623
 624 static int __init sclp_detect_standby_memory(void)
 625 {
 626         struct platform_device *sclp_pdev;
 627         struct read_storage_sccb *sccb;
 628         int i, id, assigned, rc;
 629
 630         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 631                 return 0;
 632         if (!early_read_info_sccb_valid)
 633                 return 0;
 634         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 635                 return 0;
 636         rc = -ENOMEM;
 637         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 638         if (!sccb)
 639                 goto out;
 640         assigned = 0;
 641         for (id = 0; id <= sclp_max_storage_id; id++) {
 642                 memset(sccb, 0, PAGE_SIZE);
 643                 sccb->header.length = PAGE_SIZE;
 644                 rc = do_sync_request(0x00040001 | id << 8, sccb);
 645                 if (rc)
 646                         goto out;
 647                 switch (sccb->header.response_code) {
 648                 case 0x0010:
 649                         set_bit(id, sclp_storage_ids);
 650                         for (i = 0; i < sccb->assigned; i++) {
 651                                 if (!sccb->entries[i])
 652                                         continue;
 653                                 assigned++;
 654                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 655                         }
 656                         break;
 657                 case 0x0310:
 658                         break;
 659                 case 0x0410:
 660                         for (i = 0; i < sccb->assigned; i++) {
 661                                 if (!sccb->entries[i])
 662                                         continue;
 663                                 assigned++;
 664                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 665                         }
 666                         break;
 667                 default:
 668                         rc = -EIO;
 669                         break;
 670                 }
 671                 if (!rc)
 672                         sclp_max_storage_id = sccb->max_id;
 673         }
 674         if (rc || list_empty(&sclp_mem_list))
 675                 goto out;
 676         for (i = 1; i <= rnmax - assigned; i++)
 677                 insert_increment(0, 1, 0);
 678         rc = register_memory_notifier(&sclp_mem_nb);
 679         if (rc)
 680                 goto out;
 681         rc = platform_driver_register(&sclp_mem_pdrv);
 682         if (rc)
 683                 goto out;
 684         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 685         rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
 686         if (rc)
 687                 goto out_driver;
 688         sclp_add_standby_memory();
 689         goto out;
 690 out_driver:
 691         platform_driver_unregister(&sclp_mem_pdrv);
 692 out:
 693         free_page((unsigned long) sccb);
 694         return rc;
 695 }
 696 __initcall(sclp_detect_standby_memory);
 697
 698 #endif /* CONFIG_MEMORY_HOTPLUG */
 699
 700 /*
 701  * PCI I/O adapter configuration related functions.
 702  */
 703 #define SCLP_CMDW_CONFIGURE_PCI                 0x001a0001
 704 #define SCLP_CMDW_DECONFIGURE_PCI               0x001b0001
 705
 706 #define SCLP_RECONFIG_PCI_ATPYE                 2
 707
 708 struct pci_cfg_sccb {
 709         struct sccb_header header;
 710         u8 atype;               /* adapter type */
 711         u8 reserved1;
 712         u16 reserved2;
 713         u32 aid;                /* adapter identifier */
 714 } __packed;
 715
 716 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
 717 {
 718         struct pci_cfg_sccb *sccb;
 719         int rc;
 720
 721         if (!SCLP_HAS_PCI_RECONFIG)
 722                 return -EOPNOTSUPP;
 723
 724         sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 725         if (!sccb)
 726                 return -ENOMEM;
 727
 728         sccb->header.length = PAGE_SIZE;
 729         sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
 730         sccb->aid = fid;
 731         rc = do_sync_request(cmd, sccb);
 732         if (rc)
 733                 goto out;
 734         switch (sccb->header.response_code) {
 735         case 0x0020:
 736         case 0x0120:
 737                 break;
 738         default:
 739                 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
 740                         cmd, sccb->header.response_code);
 741                 rc = -EIO;
 742                 break;
 743         }
 744 out:
 745         free_page((unsigned long) sccb);
 746         return rc;
 747 }
 748
 749 int sclp_pci_configure(u32 fid)
 750 {
 751         return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
 752 }
 753 EXPORT_SYMBOL(sclp_pci_configure);
 754
 755 int sclp_pci_deconfigure(u32 fid)
 756 {
 757         return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
 758 }
 759 EXPORT_SYMBOL(sclp_pci_deconfigure);
 760
 761 /*
 762  * Channel path configuration related functions.
 763  */
 764
 765 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 766 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 767 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 768
 769 struct chp_cfg_sccb {
 770         struct sccb_header header;
 771         u8 ccm;
 772         u8 reserved[6];
 773         u8 cssid;
 774 } __attribute__((packed));
 775
 776 static int do_chp_configure(sclp_cmdw_t cmd)
 777 {
 778         struct chp_cfg_sccb *sccb;
 779         int rc;
 780
 781         if (!SCLP_HAS_CHP_RECONFIG)
 782                 return -EOPNOTSUPP;
 783         /* Prepare sccb. */
 784         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 785         if (!sccb)
 786                 return -ENOMEM;
 787         sccb->header.length = sizeof(*sccb);
 788         rc = do_sync_request(cmd, sccb);
 789         if (rc)
 790                 goto out;
 791         switch (sccb->header.response_code) {
 792         case 0x0020:
 793         case 0x0120:
 794         case 0x0440:
 795         case 0x0450:
 796                 break;
 797         default:
 798                 pr_warning("configure channel-path failed "
 799                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
 800                            sccb->header.response_code);
 801                 rc = -EIO;
 802                 break;
 803         }
 804 out:
 805         free_page((unsigned long) sccb);
 806         return rc;
 807 }
 808
 809 /**
 810  * sclp_chp_configure - perform configure channel-path sclp command
 811  * @chpid: channel-path ID
 812  *
 813  * Perform configure channel-path command sclp command for specified chpid.
 814  * Return 0 after command successfully finished, non-zero otherwise.
 815  */
 816 int sclp_chp_configure(struct chp_id chpid)
 817 {
 818         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 819 }
 820
 821 /**
 822  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 823  * @chpid: channel-path ID
 824  *
 825  * Perform deconfigure channel-path command sclp command for specified chpid
 826  * and wait for completion. On success return 0. Return non-zero otherwise.
 827  */
 828 int sclp_chp_deconfigure(struct chp_id chpid)
 829 {
 830         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 831 }
 832
 833 struct chp_info_sccb {
 834         struct sccb_header header;
 835         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 836         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 837         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 838         u8 ccm;
 839         u8 reserved[6];
 840         u8 cssid;
 841 } __attribute__((packed));
 842
 843 /**
 844  * sclp_chp_read_info - perform read channel-path information sclp command
 845  * @info: resulting channel-path information data
 846  *
 847  * Perform read channel-path information sclp command and wait for completion.
 848  * On success, store channel-path information in @info and return 0. Return
 849  * non-zero otherwise.
 850  */
 851 int sclp_chp_read_info(struct sclp_chp_info *info)
 852 {
 853         struct chp_info_sccb *sccb;
 854         int rc;
 855
 856         if (!SCLP_HAS_CHP_INFO)
 857                 return -EOPNOTSUPP;
 858         /* Prepare sccb. */
 859         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 860         if (!sccb)
 861                 return -ENOMEM;
 862         sccb->header.length = sizeof(*sccb);
 863         rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 864         if (rc)
 865                 goto out;
 866         if (sccb->header.response_code != 0x0010) {
 867                 pr_warning("read channel-path info failed "
 868                            "(response=0x%04x)\n", sccb->header.response_code);
 869                 rc = -EIO;
 870                 goto out;
 871         }
 872         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 873         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 874         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 875 out:
 876         free_page((unsigned long) sccb);
 877         return rc;
 878 }