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