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 u8 sclp_fac85;
  60 static unsigned long long rzm;
  61 static unsigned long long rnmax;
  62
  63 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
  64 {
  65         int rc;
  66
  67         __ctl_set_bit(0, 9);
  68         rc = sclp_service_call(cmd, sccb);
  69         if (rc)
  70                 goto out;
  71         __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
  72                         PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
  73         local_irq_disable();
  74 out:
  75         /* Contents of the sccb might have changed. */
  76         barrier();
  77         __ctl_clear_bit(0, 9);
  78         return rc;
  79 }
  80
  81 static void __init sclp_read_info_early(void)
  82 {
  83         int rc;
  84         int i;
  85         struct read_info_sccb *sccb;
  86         sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
  87                                   SCLP_CMDW_READ_SCP_INFO};
  88
  89         sccb = &early_read_info_sccb;
  90         for (i = 0; i < ARRAY_SIZE(commands); i++) {
  91                 do {
  92                         memset(sccb, 0, sizeof(*sccb));
  93                         sccb->header.length = sizeof(*sccb);
  94                         sccb->header.function_code = 0x80;
  95                         sccb->header.control_mask[2] = 0x80;
  96                         rc = sclp_cmd_sync_early(commands[i], sccb);
  97                 } while (rc == -EBUSY);
  98
  99                 if (rc)
 100                         break;
 101                 if (sccb->header.response_code == 0x10) {
 102                         early_read_info_sccb_valid = 1;
 103                         break;
 104                 }
 105                 if (sccb->header.response_code != 0x1f0)
 106                         break;
 107         }
 108 }
 109
 110 static void __init sclp_event_mask_early(void)
 111 {
 112         struct init_sccb *sccb = &early_event_mask_sccb;
 113         int rc;
 114
 115         do {
 116                 memset(sccb, 0, sizeof(*sccb));
 117                 sccb->header.length = sizeof(*sccb);
 118                 sccb->mask_length = sizeof(sccb_mask_t);
 119                 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
 120         } while (rc == -EBUSY);
 121 }
 122
 123 void __init sclp_facilities_detect(void)
 124 {
 125         struct read_info_sccb *sccb;
 126
 127         sclp_read_info_early();
 128         if (!early_read_info_sccb_valid)
 129                 return;
 130
 131         sccb = &early_read_info_sccb;
 132         sclp_facilities = sccb->facilities;
 133         sclp_fac84 = sccb->fac84;
 134         sclp_fac85 = sccb->fac85;
 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 u8 sclp_get_fac85(void)
 175 {
 176         return sclp_fac85;
 177 }
 178 EXPORT_SYMBOL_GPL(sclp_get_fac85);
 179
 180 /*
 181  * This function will be called after sclp_facilities_detect(), which gets
 182  * called from early.c code. Therefore the sccb should have valid contents.
 183  */
 184 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
 185 {
 186         struct read_info_sccb *sccb;
 187
 188         if (!early_read_info_sccb_valid)
 189                 return;
 190         sccb = &early_read_info_sccb;
 191         info->is_valid = 1;
 192         if (sccb->flags & 0x2)
 193                 info->has_dump = 1;
 194         memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
 195 }
 196
 197 static void sclp_sync_callback(struct sclp_req *req, void *data)
 198 {
 199         struct completion *completion = data;
 200
 201         complete(completion);
 202 }
 203
 204 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
 205 {
 206         struct completion completion;
 207         struct sclp_req *request;
 208         int rc;
 209
 210         request = kzalloc(sizeof(*request), GFP_KERNEL);
 211         if (!request)
 212                 return -ENOMEM;
 213         request->command = cmd;
 214         request->sccb = sccb;
 215         request->status = SCLP_REQ_FILLED;
 216         request->callback = sclp_sync_callback;
 217         request->callback_data = &completion;
 218         init_completion(&completion);
 219
 220         /* Perform sclp request. */
 221         rc = sclp_add_request(request);
 222         if (rc)
 223                 goto out;
 224         wait_for_completion(&completion);
 225
 226         /* Check response. */
 227         if (request->status != SCLP_REQ_DONE) {
 228                 pr_warning("sync request failed (cmd=0x%08x, "
 229                            "status=0x%02x)\n", cmd, request->status);
 230                 rc = -EIO;
 231         }
 232 out:
 233         kfree(request);
 234         return rc;
 235 }
 236
 237 /*
 238  * CPU configuration related functions.
 239  */
 240
 241 #define SCLP_CMDW_READ_CPU_INFO         0x00010001
 242 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
 243 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
 244
 245 struct read_cpu_info_sccb {
 246         struct  sccb_header header;
 247         u16     nr_configured;
 248         u16     offset_configured;
 249         u16     nr_standby;
 250         u16     offset_standby;
 251         u8      reserved[4096 - 16];
 252 } __attribute__((packed, aligned(PAGE_SIZE)));
 253
 254 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
 255                                struct read_cpu_info_sccb *sccb)
 256 {
 257         char *page = (char *) sccb;
 258
 259         memset(info, 0, sizeof(*info));
 260         info->configured = sccb->nr_configured;
 261         info->standby = sccb->nr_standby;
 262         info->combined = sccb->nr_configured + sccb->nr_standby;
 263         info->has_cpu_type = sclp_fac84 & 0x1;
 264         memcpy(&info->cpu, page + sccb->offset_configured,
 265                info->combined * sizeof(struct sclp_cpu_entry));
 266 }
 267
 268 int sclp_get_cpu_info(struct sclp_cpu_info *info)
 269 {
 270         int rc;
 271         struct read_cpu_info_sccb *sccb;
 272
 273         if (!SCLP_HAS_CPU_INFO)
 274                 return -EOPNOTSUPP;
 275         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 276         if (!sccb)
 277                 return -ENOMEM;
 278         sccb->header.length = sizeof(*sccb);
 279         rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
 280         if (rc)
 281                 goto out;
 282         if (sccb->header.response_code != 0x0010) {
 283                 pr_warning("readcpuinfo failed (response=0x%04x)\n",
 284                            sccb->header.response_code);
 285                 rc = -EIO;
 286                 goto out;
 287         }
 288         sclp_fill_cpu_info(info, sccb);
 289 out:
 290         free_page((unsigned long) sccb);
 291         return rc;
 292 }
 293
 294 struct cpu_configure_sccb {
 295         struct sccb_header header;
 296 } __attribute__((packed, aligned(8)));
 297
 298 static int do_cpu_configure(sclp_cmdw_t cmd)
 299 {
 300         struct cpu_configure_sccb *sccb;
 301         int rc;
 302
 303         if (!SCLP_HAS_CPU_RECONFIG)
 304                 return -EOPNOTSUPP;
 305         /*
 306          * This is not going to cross a page boundary since we force
 307          * kmalloc to have a minimum alignment of 8 bytes on s390.
 308          */
 309         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 310         if (!sccb)
 311                 return -ENOMEM;
 312         sccb->header.length = sizeof(*sccb);
 313         rc = do_sync_request(cmd, sccb);
 314         if (rc)
 315                 goto out;
 316         switch (sccb->header.response_code) {
 317         case 0x0020:
 318         case 0x0120:
 319                 break;
 320         default:
 321                 pr_warning("configure cpu failed (cmd=0x%08x, "
 322                            "response=0x%04x)\n", cmd,
 323                            sccb->header.response_code);
 324                 rc = -EIO;
 325                 break;
 326         }
 327 out:
 328         kfree(sccb);
 329         return rc;
 330 }
 331
 332 int sclp_cpu_configure(u8 cpu)
 333 {
 334         return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
 335 }
 336
 337 int sclp_cpu_deconfigure(u8 cpu)
 338 {
 339         return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
 340 }
 341
 342 #ifdef CONFIG_MEMORY_HOTPLUG
 343
 344 static DEFINE_MUTEX(sclp_mem_mutex);
 345 static LIST_HEAD(sclp_mem_list);
 346 static u8 sclp_max_storage_id;
 347 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
 348 static int sclp_mem_state_changed;
 349
 350 struct memory_increment {
 351         struct list_head list;
 352         u16 rn;
 353         int standby;
 354         int usecount;
 355 };
 356
 357 struct assign_storage_sccb {
 358         struct sccb_header header;
 359         u16 rn;
 360 } __packed;
 361
 362 int arch_get_memory_phys_device(unsigned long start_pfn)
 363 {
 364         if (!rzm)
 365                 return 0;
 366         return PFN_PHYS(start_pfn) >> ilog2(rzm);
 367 }
 368
 369 static unsigned long long rn2addr(u16 rn)
 370 {
 371         return (unsigned long long) (rn - 1) * rzm;
 372 }
 373
 374 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 375 {
 376         struct assign_storage_sccb *sccb;
 377         int rc;
 378
 379         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 380         if (!sccb)
 381                 return -ENOMEM;
 382         sccb->header.length = PAGE_SIZE;
 383         sccb->rn = rn;
 384         rc = do_sync_request(cmd, sccb);
 385         if (rc)
 386                 goto out;
 387         switch (sccb->header.response_code) {
 388         case 0x0020:
 389         case 0x0120:
 390                 break;
 391         default:
 392                 pr_warning("assign storage failed (cmd=0x%08x, "
 393                            "response=0x%04x, rn=0x%04x)\n", cmd,
 394                            sccb->header.response_code, rn);
 395                 rc = -EIO;
 396                 break;
 397         }
 398 out:
 399         free_page((unsigned long) sccb);
 400         return rc;
 401 }
 402
 403 static int sclp_assign_storage(u16 rn)
 404 {
 405         unsigned long long start;
 406         int rc;
 407
 408         rc = do_assign_storage(0x000d0001, rn);
 409         if (rc)
 410                 return rc;
 411         start = rn2addr(rn);
 412         storage_key_init_range(start, start + rzm);
 413         return 0;
 414 }
 415
 416 static int sclp_unassign_storage(u16 rn)
 417 {
 418         return do_assign_storage(0x000c0001, rn);
 419 }
 420
 421 struct attach_storage_sccb {
 422         struct sccb_header header;
 423         u16 :16;
 424         u16 assigned;
 425         u32 :32;
 426         u32 entries[0];
 427 } __packed;
 428
 429 static int sclp_attach_storage(u8 id)
 430 {
 431         struct attach_storage_sccb *sccb;
 432         int rc;
 433         int i;
 434
 435         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 436         if (!sccb)
 437                 return -ENOMEM;
 438         sccb->header.length = PAGE_SIZE;
 439         rc = do_sync_request(0x00080001 | id << 8, sccb);
 440         if (rc)
 441                 goto out;
 442         switch (sccb->header.response_code) {
 443         case 0x0020:
 444                 set_bit(id, sclp_storage_ids);
 445                 for (i = 0; i < sccb->assigned; i++) {
 446                         if (sccb->entries[i])
 447                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 448                 }
 449                 break;
 450         default:
 451                 rc = -EIO;
 452                 break;
 453         }
 454 out:
 455         free_page((unsigned long) sccb);
 456         return rc;
 457 }
 458
 459 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 460                                  int online)
 461 {
 462         struct memory_increment *incr;
 463         unsigned long long istart;
 464         int rc = 0;
 465
 466         list_for_each_entry(incr, &sclp_mem_list, list) {
 467                 istart = rn2addr(incr->rn);
 468                 if (start + size - 1 < istart)
 469                         break;
 470                 if (start > istart + rzm - 1)
 471                         continue;
 472                 if (online) {
 473                         if (incr->usecount++)
 474                                 continue;
 475                         /*
 476                          * Don't break the loop if one assign fails. Loop may
 477                          * be walked again on CANCEL and we can't save
 478                          * information if state changed before or not.
 479                          * So continue and increase usecount for all increments.
 480                          */
 481                         rc |= sclp_assign_storage(incr->rn);
 482                 } else {
 483                         if (--incr->usecount)
 484                                 continue;
 485                         sclp_unassign_storage(incr->rn);
 486                 }
 487         }
 488         return rc ? -EIO : 0;
 489 }
 490
 491 static int sclp_mem_notifier(struct notifier_block *nb,
 492                              unsigned long action, void *data)
 493 {
 494         unsigned long start, size;
 495         struct memory_notify *arg;
 496         unsigned char id;
 497         int rc = 0;
 498
 499         arg = data;
 500         start = arg->start_pfn << PAGE_SHIFT;
 501         size = arg->nr_pages << PAGE_SHIFT;
 502         mutex_lock(&sclp_mem_mutex);
 503         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 504                 sclp_attach_storage(id);
 505         switch (action) {
 506         case MEM_ONLINE:
 507         case MEM_GOING_OFFLINE:
 508         case MEM_CANCEL_OFFLINE:
 509                 break;
 510         case MEM_GOING_ONLINE:
 511                 rc = sclp_mem_change_state(start, size, 1);
 512                 break;
 513         case MEM_CANCEL_ONLINE:
 514                 sclp_mem_change_state(start, size, 0);
 515                 break;
 516         case MEM_OFFLINE:
 517                 sclp_mem_change_state(start, size, 0);
 518                 break;
 519         default:
 520                 rc = -EINVAL;
 521                 break;
 522         }
 523         if (!rc)
 524                 sclp_mem_state_changed = 1;
 525         mutex_unlock(&sclp_mem_mutex);
 526         return rc ? NOTIFY_BAD : NOTIFY_OK;
 527 }
 528
 529 static struct notifier_block sclp_mem_nb = {
 530         .notifier_call = sclp_mem_notifier,
 531 };
 532
 533 static void __init add_memory_merged(u16 rn)
 534 {
 535         static u16 first_rn, num;
 536         unsigned long long start, size;
 537
 538         if (rn && first_rn && (first_rn + num == rn)) {
 539                 num++;
 540                 return;
 541         }
 542         if (!first_rn)
 543                 goto skip_add;
 544         start = rn2addr(first_rn);
 545         size = (unsigned long long ) num * rzm;
 546         if (start >= VMEM_MAX_PHYS)
 547                 goto skip_add;
 548         if (start + size > VMEM_MAX_PHYS)
 549                 size = VMEM_MAX_PHYS - start;
 550         if (memory_end_set && (start >= memory_end))
 551                 goto skip_add;
 552         if (memory_end_set && (start + size > memory_end))
 553                 size = memory_end - start;
 554         add_memory(0, start, size);
 555 skip_add:
 556         first_rn = rn;
 557         num = 1;
 558 }
 559
 560 static void __init sclp_add_standby_memory(void)
 561 {
 562         struct memory_increment *incr;
 563
 564         list_for_each_entry(incr, &sclp_mem_list, list)
 565                 if (incr->standby)
 566                         add_memory_merged(incr->rn);
 567         add_memory_merged(0);
 568 }
 569
 570 static void __init insert_increment(u16 rn, int standby, int assigned)
 571 {
 572         struct memory_increment *incr, *new_incr;
 573         struct list_head *prev;
 574         u16 last_rn;
 575
 576         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 577         if (!new_incr)
 578                 return;
 579         new_incr->rn = rn;
 580         new_incr->standby = standby;
 581         if (!standby)
 582                 new_incr->usecount = 1;
 583         last_rn = 0;
 584         prev = &sclp_mem_list;
 585         list_for_each_entry(incr, &sclp_mem_list, list) {
 586                 if (assigned && incr->rn > rn)
 587                         break;
 588                 if (!assigned && incr->rn - last_rn > 1)
 589                         break;
 590                 last_rn = incr->rn;
 591                 prev = &incr->list;
 592         }
 593         if (!assigned)
 594                 new_incr->rn = last_rn + 1;
 595         if (new_incr->rn > rnmax) {
 596                 kfree(new_incr);
 597                 return;
 598         }
 599         list_add(&new_incr->list, prev);
 600 }
 601
 602 static int sclp_mem_freeze(struct device *dev)
 603 {
 604         if (!sclp_mem_state_changed)
 605                 return 0;
 606         pr_err("Memory hotplug state changed, suspend refused.\n");
 607         return -EPERM;
 608 }
 609
 610 struct read_storage_sccb {
 611         struct sccb_header header;
 612         u16 max_id;
 613         u16 assigned;
 614         u16 standby;
 615         u16 :16;
 616         u32 entries[0];
 617 } __packed;
 618
 619 static const struct dev_pm_ops sclp_mem_pm_ops = {
 620         .freeze         = sclp_mem_freeze,
 621 };
 622
 623 static struct platform_driver sclp_mem_pdrv = {
 624         .driver = {
 625                 .name   = "sclp_mem",
 626                 .pm     = &sclp_mem_pm_ops,
 627         },
 628 };
 629
 630 static int __init sclp_detect_standby_memory(void)
 631 {
 632         struct platform_device *sclp_pdev;
 633         struct read_storage_sccb *sccb;
 634         int i, id, assigned, rc;
 635
 636         if (!early_read_info_sccb_valid)
 637                 return 0;
 638         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 639                 return 0;
 640         rc = -ENOMEM;
 641         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 642         if (!sccb)
 643                 goto out;
 644         assigned = 0;
 645         for (id = 0; id <= sclp_max_storage_id; id++) {
 646                 memset(sccb, 0, PAGE_SIZE);
 647                 sccb->header.length = PAGE_SIZE;
 648                 rc = do_sync_request(0x00040001 | id << 8, sccb);
 649                 if (rc)
 650                         goto out;
 651                 switch (sccb->header.response_code) {
 652                 case 0x0010:
 653                         set_bit(id, sclp_storage_ids);
 654                         for (i = 0; i < sccb->assigned; i++) {
 655                                 if (!sccb->entries[i])
 656                                         continue;
 657                                 assigned++;
 658                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 659                         }
 660                         break;
 661                 case 0x0310:
 662                         break;
 663                 case 0x0410:
 664                         for (i = 0; i < sccb->assigned; i++) {
 665                                 if (!sccb->entries[i])
 666                                         continue;
 667                                 assigned++;
 668                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 669                         }
 670                         break;
 671                 default:
 672                         rc = -EIO;
 673                         break;
 674                 }
 675                 if (!rc)
 676                         sclp_max_storage_id = sccb->max_id;
 677         }
 678         if (rc || list_empty(&sclp_mem_list))
 679                 goto out;
 680         for (i = 1; i <= rnmax - assigned; i++)
 681                 insert_increment(0, 1, 0);
 682         rc = register_memory_notifier(&sclp_mem_nb);
 683         if (rc)
 684                 goto out;
 685         rc = platform_driver_register(&sclp_mem_pdrv);
 686         if (rc)
 687                 goto out;
 688         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 689         rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
 690         if (rc)
 691                 goto out_driver;
 692         sclp_add_standby_memory();
 693         goto out;
 694 out_driver:
 695         platform_driver_unregister(&sclp_mem_pdrv);
 696 out:
 697         free_page((unsigned long) sccb);
 698         return rc;
 699 }
 700 __initcall(sclp_detect_standby_memory);
 701
 702 #endif /* CONFIG_MEMORY_HOTPLUG */
 703
 704 /*
 705  * PCI I/O adapter configuration related functions.
 706  */
 707 #define SCLP_CMDW_CONFIGURE_PCI                 0x001a0001
 708 #define SCLP_CMDW_DECONFIGURE_PCI               0x001b0001
 709
 710 #define SCLP_RECONFIG_PCI_ATPYE                 2
 711
 712 struct pci_cfg_sccb {
 713         struct sccb_header header;
 714         u8 atype;               /* adapter type */
 715         u8 reserved1;
 716         u16 reserved2;
 717         u32 aid;                /* adapter identifier */
 718 } __packed;
 719
 720 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
 721 {
 722         struct pci_cfg_sccb *sccb;
 723         int rc;
 724
 725         if (!SCLP_HAS_PCI_RECONFIG)
 726                 return -EOPNOTSUPP;
 727
 728         sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 729         if (!sccb)
 730                 return -ENOMEM;
 731
 732         sccb->header.length = PAGE_SIZE;
 733         sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
 734         sccb->aid = fid;
 735         rc = do_sync_request(cmd, sccb);
 736         if (rc)
 737                 goto out;
 738         switch (sccb->header.response_code) {
 739         case 0x0020:
 740         case 0x0120:
 741                 break;
 742         default:
 743                 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
 744                         cmd, sccb->header.response_code);
 745                 rc = -EIO;
 746                 break;
 747         }
 748 out:
 749         free_page((unsigned long) sccb);
 750         return rc;
 751 }
 752
 753 int sclp_pci_configure(u32 fid)
 754 {
 755         return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
 756 }
 757 EXPORT_SYMBOL(sclp_pci_configure);
 758
 759 int sclp_pci_deconfigure(u32 fid)
 760 {
 761         return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
 762 }
 763 EXPORT_SYMBOL(sclp_pci_deconfigure);
 764
 765 /*
 766  * Channel path configuration related functions.
 767  */
 768
 769 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 770 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 771 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 772
 773 struct chp_cfg_sccb {
 774         struct sccb_header header;
 775         u8 ccm;
 776         u8 reserved[6];
 777         u8 cssid;
 778 } __attribute__((packed));
 779
 780 static int do_chp_configure(sclp_cmdw_t cmd)
 781 {
 782         struct chp_cfg_sccb *sccb;
 783         int rc;
 784
 785         if (!SCLP_HAS_CHP_RECONFIG)
 786                 return -EOPNOTSUPP;
 787         /* Prepare sccb. */
 788         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 789         if (!sccb)
 790                 return -ENOMEM;
 791         sccb->header.length = sizeof(*sccb);
 792         rc = do_sync_request(cmd, sccb);
 793         if (rc)
 794                 goto out;
 795         switch (sccb->header.response_code) {
 796         case 0x0020:
 797         case 0x0120:
 798         case 0x0440:
 799         case 0x0450:
 800                 break;
 801         default:
 802                 pr_warning("configure channel-path failed "
 803                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
 804                            sccb->header.response_code);
 805                 rc = -EIO;
 806                 break;
 807         }
 808 out:
 809         free_page((unsigned long) sccb);
 810         return rc;
 811 }
 812
 813 /**
 814  * sclp_chp_configure - perform configure channel-path sclp command
 815  * @chpid: channel-path ID
 816  *
 817  * Perform configure channel-path command sclp command for specified chpid.
 818  * Return 0 after command successfully finished, non-zero otherwise.
 819  */
 820 int sclp_chp_configure(struct chp_id chpid)
 821 {
 822         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 823 }
 824
 825 /**
 826  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 827  * @chpid: channel-path ID
 828  *
 829  * Perform deconfigure channel-path command sclp command for specified chpid
 830  * and wait for completion. On success return 0. Return non-zero otherwise.
 831  */
 832 int sclp_chp_deconfigure(struct chp_id chpid)
 833 {
 834         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 835 }
 836
 837 struct chp_info_sccb {
 838         struct sccb_header header;
 839         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 840         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 841         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 842         u8 ccm;
 843         u8 reserved[6];
 844         u8 cssid;
 845 } __attribute__((packed));
 846
 847 /**
 848  * sclp_chp_read_info - perform read channel-path information sclp command
 849  * @info: resulting channel-path information data
 850  *
 851  * Perform read channel-path information sclp command and wait for completion.
 852  * On success, store channel-path information in @info and return 0. Return
 853  * non-zero otherwise.
 854  */
 855 int sclp_chp_read_info(struct sclp_chp_info *info)
 856 {
 857         struct chp_info_sccb *sccb;
 858         int rc;
 859
 860         if (!SCLP_HAS_CHP_INFO)
 861                 return -EOPNOTSUPP;
 862         /* Prepare sccb. */
 863         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 864         if (!sccb)
 865                 return -ENOMEM;
 866         sccb->header.length = sizeof(*sccb);
 867         rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 868         if (rc)
 869                 goto out;
 870         if (sccb->header.response_code != 0x0010) {
 871                 pr_warning("read channel-path info failed "
 872                            "(response=0x%04x)\n", sccb->header.response_code);
 873                 rc = -EIO;
 874                 goto out;
 875         }
 876         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 877         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 878         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 879 out:
 880         free_page((unsigned long) sccb);
 881         return rc;
 882 }