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 int sclp_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 = sclp_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 = sclp_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 };
 349
 350 struct assign_storage_sccb {
 351         struct sccb_header header;
 352         u16 rn;
 353 } __packed;
 354
 355 int arch_get_memory_phys_device(unsigned long start_pfn)
 356 {
 357         if (!rzm)
 358                 return 0;
 359         return PFN_PHYS(start_pfn) >> ilog2(rzm);
 360 }
 361
 362 static unsigned long long rn2addr(u16 rn)
 363 {
 364         return (unsigned long long) (rn - 1) * rzm;
 365 }
 366
 367 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 368 {
 369         struct assign_storage_sccb *sccb;
 370         int rc;
 371
 372         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 373         if (!sccb)
 374                 return -ENOMEM;
 375         sccb->header.length = PAGE_SIZE;
 376         sccb->rn = rn;
 377         rc = sclp_sync_request(cmd, sccb);
 378         if (rc)
 379                 goto out;
 380         switch (sccb->header.response_code) {
 381         case 0x0020:
 382         case 0x0120:
 383                 break;
 384         default:
 385                 pr_warning("assign storage failed (cmd=0x%08x, "
 386                            "response=0x%04x, rn=0x%04x)\n", cmd,
 387                            sccb->header.response_code, rn);
 388                 rc = -EIO;
 389                 break;
 390         }
 391 out:
 392         free_page((unsigned long) sccb);
 393         return rc;
 394 }
 395
 396 static int sclp_assign_storage(u16 rn)
 397 {
 398         unsigned long long start;
 399         int rc;
 400
 401         rc = do_assign_storage(0x000d0001, rn);
 402         if (rc)
 403                 return rc;
 404         start = rn2addr(rn);
 405         storage_key_init_range(start, start + rzm);
 406         return 0;
 407 }
 408
 409 static int sclp_unassign_storage(u16 rn)
 410 {
 411         return do_assign_storage(0x000c0001, rn);
 412 }
 413
 414 struct attach_storage_sccb {
 415         struct sccb_header header;
 416         u16 :16;
 417         u16 assigned;
 418         u32 :32;
 419         u32 entries[0];
 420 } __packed;
 421
 422 static int sclp_attach_storage(u8 id)
 423 {
 424         struct attach_storage_sccb *sccb;
 425         int rc;
 426         int i;
 427
 428         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 429         if (!sccb)
 430                 return -ENOMEM;
 431         sccb->header.length = PAGE_SIZE;
 432         rc = sclp_sync_request(0x00080001 | id << 8, sccb);
 433         if (rc)
 434                 goto out;
 435         switch (sccb->header.response_code) {
 436         case 0x0020:
 437                 set_bit(id, sclp_storage_ids);
 438                 for (i = 0; i < sccb->assigned; i++) {
 439                         if (sccb->entries[i])
 440                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 441                 }
 442                 break;
 443         default:
 444                 rc = -EIO;
 445                 break;
 446         }
 447 out:
 448         free_page((unsigned long) sccb);
 449         return rc;
 450 }
 451
 452 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 453                                  int online)
 454 {
 455         struct memory_increment *incr;
 456         unsigned long long istart;
 457         int rc = 0;
 458
 459         list_for_each_entry(incr, &sclp_mem_list, list) {
 460                 istart = rn2addr(incr->rn);
 461                 if (start + size - 1 < istart)
 462                         break;
 463                 if (start > istart + rzm - 1)
 464                         continue;
 465                 if (online)
 466                         rc |= sclp_assign_storage(incr->rn);
 467                 else
 468                         sclp_unassign_storage(incr->rn);
 469         }
 470         return rc ? -EIO : 0;
 471 }
 472
 473 static int sclp_mem_notifier(struct notifier_block *nb,
 474                              unsigned long action, void *data)
 475 {
 476         unsigned long start, size;
 477         struct memory_notify *arg;
 478         unsigned char id;
 479         int rc = 0;
 480
 481         arg = data;
 482         start = arg->start_pfn << PAGE_SHIFT;
 483         size = arg->nr_pages << PAGE_SHIFT;
 484         mutex_lock(&sclp_mem_mutex);
 485         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 486                 sclp_attach_storage(id);
 487         switch (action) {
 488         case MEM_ONLINE:
 489         case MEM_GOING_OFFLINE:
 490         case MEM_CANCEL_OFFLINE:
 491                 break;
 492         case MEM_GOING_ONLINE:
 493                 rc = sclp_mem_change_state(start, size, 1);
 494                 break;
 495         case MEM_CANCEL_ONLINE:
 496                 sclp_mem_change_state(start, size, 0);
 497                 break;
 498         case MEM_OFFLINE:
 499                 sclp_mem_change_state(start, size, 0);
 500                 break;
 501         default:
 502                 rc = -EINVAL;
 503                 break;
 504         }
 505         if (!rc)
 506                 sclp_mem_state_changed = 1;
 507         mutex_unlock(&sclp_mem_mutex);
 508         return rc ? NOTIFY_BAD : NOTIFY_OK;
 509 }
 510
 511 static struct notifier_block sclp_mem_nb = {
 512         .notifier_call = sclp_mem_notifier,
 513 };
 514
 515 static void __init add_memory_merged(u16 rn)
 516 {
 517         static u16 first_rn, num;
 518         unsigned long long start, size;
 519
 520         if (rn && first_rn && (first_rn + num == rn)) {
 521                 num++;
 522                 return;
 523         }
 524         if (!first_rn)
 525                 goto skip_add;
 526         start = rn2addr(first_rn);
 527         size = (unsigned long long ) num * rzm;
 528         if (start >= VMEM_MAX_PHYS)
 529                 goto skip_add;
 530         if (start + size > VMEM_MAX_PHYS)
 531                 size = VMEM_MAX_PHYS - start;
 532         if (memory_end_set && (start >= memory_end))
 533                 goto skip_add;
 534         if (memory_end_set && (start + size > memory_end))
 535                 size = memory_end - start;
 536         add_memory(0, start, size);
 537 skip_add:
 538         first_rn = rn;
 539         num = 1;
 540 }
 541
 542 static void __init sclp_add_standby_memory(void)
 543 {
 544         struct memory_increment *incr;
 545
 546         list_for_each_entry(incr, &sclp_mem_list, list)
 547                 if (incr->standby)
 548                         add_memory_merged(incr->rn);
 549         add_memory_merged(0);
 550 }
 551
 552 static void __init insert_increment(u16 rn, int standby, int assigned)
 553 {
 554         struct memory_increment *incr, *new_incr;
 555         struct list_head *prev;
 556         u16 last_rn;
 557
 558         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 559         if (!new_incr)
 560                 return;
 561         new_incr->rn = rn;
 562         new_incr->standby = standby;
 563         last_rn = 0;
 564         prev = &sclp_mem_list;
 565         list_for_each_entry(incr, &sclp_mem_list, list) {
 566                 if (assigned && incr->rn > rn)
 567                         break;
 568                 if (!assigned && incr->rn - last_rn > 1)
 569                         break;
 570                 last_rn = incr->rn;
 571                 prev = &incr->list;
 572         }
 573         if (!assigned)
 574                 new_incr->rn = last_rn + 1;
 575         if (new_incr->rn > rnmax) {
 576                 kfree(new_incr);
 577                 return;
 578         }
 579         list_add(&new_incr->list, prev);
 580 }
 581
 582 static int sclp_mem_freeze(struct device *dev)
 583 {
 584         if (!sclp_mem_state_changed)
 585                 return 0;
 586         pr_err("Memory hotplug state changed, suspend refused.\n");
 587         return -EPERM;
 588 }
 589
 590 struct read_storage_sccb {
 591         struct sccb_header header;
 592         u16 max_id;
 593         u16 assigned;
 594         u16 standby;
 595         u16 :16;
 596         u32 entries[0];
 597 } __packed;
 598
 599 static const struct dev_pm_ops sclp_mem_pm_ops = {
 600         .freeze         = sclp_mem_freeze,
 601 };
 602
 603 static struct platform_driver sclp_mem_pdrv = {
 604         .driver = {
 605                 .name   = "sclp_mem",
 606                 .pm     = &sclp_mem_pm_ops,
 607         },
 608 };
 609
 610 static int __init sclp_detect_standby_memory(void)
 611 {
 612         struct platform_device *sclp_pdev;
 613         struct read_storage_sccb *sccb;
 614         int i, id, assigned, rc;
 615
 616         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 617                 return 0;
 618         if (!early_read_info_sccb_valid)
 619                 return 0;
 620         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 621                 return 0;
 622         rc = -ENOMEM;
 623         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 624         if (!sccb)
 625                 goto out;
 626         assigned = 0;
 627         for (id = 0; id <= sclp_max_storage_id; id++) {
 628                 memset(sccb, 0, PAGE_SIZE);
 629                 sccb->header.length = PAGE_SIZE;
 630                 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
 631                 if (rc)
 632                         goto out;
 633                 switch (sccb->header.response_code) {
 634                 case 0x0010:
 635                         set_bit(id, sclp_storage_ids);
 636                         for (i = 0; i < sccb->assigned; i++) {
 637                                 if (!sccb->entries[i])
 638                                         continue;
 639                                 assigned++;
 640                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 641                         }
 642                         break;
 643                 case 0x0310:
 644                         break;
 645                 case 0x0410:
 646                         for (i = 0; i < sccb->assigned; i++) {
 647                                 if (!sccb->entries[i])
 648                                         continue;
 649                                 assigned++;
 650                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 651                         }
 652                         break;
 653                 default:
 654                         rc = -EIO;
 655                         break;
 656                 }
 657                 if (!rc)
 658                         sclp_max_storage_id = sccb->max_id;
 659         }
 660         if (rc || list_empty(&sclp_mem_list))
 661                 goto out;
 662         for (i = 1; i <= rnmax - assigned; i++)
 663                 insert_increment(0, 1, 0);
 664         rc = register_memory_notifier(&sclp_mem_nb);
 665         if (rc)
 666                 goto out;
 667         rc = platform_driver_register(&sclp_mem_pdrv);
 668         if (rc)
 669                 goto out;
 670         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 671         rc = PTR_RET(sclp_pdev);
 672         if (rc)
 673                 goto out_driver;
 674         sclp_add_standby_memory();
 675         goto out;
 676 out_driver:
 677         platform_driver_unregister(&sclp_mem_pdrv);
 678 out:
 679         free_page((unsigned long) sccb);
 680         return rc;
 681 }
 682 __initcall(sclp_detect_standby_memory);
 683
 684 #endif /* CONFIG_MEMORY_HOTPLUG */
 685
 686 /*
 687  * PCI I/O adapter configuration related functions.
 688  */
 689 #define SCLP_CMDW_CONFIGURE_PCI                 0x001a0001
 690 #define SCLP_CMDW_DECONFIGURE_PCI               0x001b0001
 691
 692 #define SCLP_RECONFIG_PCI_ATPYE                 2
 693
 694 struct pci_cfg_sccb {
 695         struct sccb_header header;
 696         u8 atype;               /* adapter type */
 697         u8 reserved1;
 698         u16 reserved2;
 699         u32 aid;                /* adapter identifier */
 700 } __packed;
 701
 702 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
 703 {
 704         struct pci_cfg_sccb *sccb;
 705         int rc;
 706
 707         if (!SCLP_HAS_PCI_RECONFIG)
 708                 return -EOPNOTSUPP;
 709
 710         sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 711         if (!sccb)
 712                 return -ENOMEM;
 713
 714         sccb->header.length = PAGE_SIZE;
 715         sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
 716         sccb->aid = fid;
 717         rc = sclp_sync_request(cmd, sccb);
 718         if (rc)
 719                 goto out;
 720         switch (sccb->header.response_code) {
 721         case 0x0020:
 722         case 0x0120:
 723                 break;
 724         default:
 725                 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
 726                         cmd, sccb->header.response_code);
 727                 rc = -EIO;
 728                 break;
 729         }
 730 out:
 731         free_page((unsigned long) sccb);
 732         return rc;
 733 }
 734
 735 int sclp_pci_configure(u32 fid)
 736 {
 737         return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
 738 }
 739 EXPORT_SYMBOL(sclp_pci_configure);
 740
 741 int sclp_pci_deconfigure(u32 fid)
 742 {
 743         return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
 744 }
 745 EXPORT_SYMBOL(sclp_pci_deconfigure);
 746
 747 /*
 748  * Channel path configuration related functions.
 749  */
 750
 751 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 752 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 753 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 754
 755 struct chp_cfg_sccb {
 756         struct sccb_header header;
 757         u8 ccm;
 758         u8 reserved[6];
 759         u8 cssid;
 760 } __attribute__((packed));
 761
 762 static int do_chp_configure(sclp_cmdw_t cmd)
 763 {
 764         struct chp_cfg_sccb *sccb;
 765         int rc;
 766
 767         if (!SCLP_HAS_CHP_RECONFIG)
 768                 return -EOPNOTSUPP;
 769         /* Prepare sccb. */
 770         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 771         if (!sccb)
 772                 return -ENOMEM;
 773         sccb->header.length = sizeof(*sccb);
 774         rc = sclp_sync_request(cmd, sccb);
 775         if (rc)
 776                 goto out;
 777         switch (sccb->header.response_code) {
 778         case 0x0020:
 779         case 0x0120:
 780         case 0x0440:
 781         case 0x0450:
 782                 break;
 783         default:
 784                 pr_warning("configure channel-path failed "
 785                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
 786                            sccb->header.response_code);
 787                 rc = -EIO;
 788                 break;
 789         }
 790 out:
 791         free_page((unsigned long) sccb);
 792         return rc;
 793 }
 794
 795 /**
 796  * sclp_chp_configure - perform configure channel-path sclp command
 797  * @chpid: channel-path ID
 798  *
 799  * Perform configure channel-path command sclp command for specified chpid.
 800  * Return 0 after command successfully finished, non-zero otherwise.
 801  */
 802 int sclp_chp_configure(struct chp_id chpid)
 803 {
 804         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 805 }
 806
 807 /**
 808  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 809  * @chpid: channel-path ID
 810  *
 811  * Perform deconfigure channel-path command sclp command for specified chpid
 812  * and wait for completion. On success return 0. Return non-zero otherwise.
 813  */
 814 int sclp_chp_deconfigure(struct chp_id chpid)
 815 {
 816         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 817 }
 818
 819 struct chp_info_sccb {
 820         struct sccb_header header;
 821         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 822         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 823         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 824         u8 ccm;
 825         u8 reserved[6];
 826         u8 cssid;
 827 } __attribute__((packed));
 828
 829 /**
 830  * sclp_chp_read_info - perform read channel-path information sclp command
 831  * @info: resulting channel-path information data
 832  *
 833  * Perform read channel-path information sclp command and wait for completion.
 834  * On success, store channel-path information in @info and return 0. Return
 835  * non-zero otherwise.
 836  */
 837 int sclp_chp_read_info(struct sclp_chp_info *info)
 838 {
 839         struct chp_info_sccb *sccb;
 840         int rc;
 841
 842         if (!SCLP_HAS_CHP_INFO)
 843                 return -EOPNOTSUPP;
 844         /* Prepare sccb. */
 845         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 846         if (!sccb)
 847                 return -ENOMEM;
 848         sccb->header.length = sizeof(*sccb);
 849         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 850         if (rc)
 851                 goto out;
 852         if (sccb->header.response_code != 0x0010) {
 853                 pr_warning("read channel-path info failed "
 854                            "(response=0x%04x)\n", sccb->header.response_code);
 855                 rc = -EIO;
 856                 goto out;
 857         }
 858         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 859         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 860         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 861 out:
 862         free_page((unsigned long) sccb);
 863         return rc;
 864 }