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 #include <asm/numa.h>
  29
  30 #include "sclp.h"
  31
  32 static void sclp_sync_callback(struct sclp_req *req, void *data)
  33 {
  34         struct completion *completion = data;
  35
  36         complete(completion);
  37 }
  38
  39 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
  40 {
  41         return sclp_sync_request_timeout(cmd, sccb, 0);
  42 }
  43
  44 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
  45 {
  46         struct completion completion;
  47         struct sclp_req *request;
  48         int rc;
  49
  50         request = kzalloc(sizeof(*request), GFP_KERNEL);
  51         if (!request)
  52                 return -ENOMEM;
  53         if (timeout)
  54                 request->queue_timeout = timeout;
  55         request->command = cmd;
  56         request->sccb = sccb;
  57         request->status = SCLP_REQ_FILLED;
  58         request->callback = sclp_sync_callback;
  59         request->callback_data = &completion;
  60         init_completion(&completion);
  61
  62         /* Perform sclp request. */
  63         rc = sclp_add_request(request);
  64         if (rc)
  65                 goto out;
  66         wait_for_completion(&completion);
  67
  68         /* Check response. */
  69         if (request->status != SCLP_REQ_DONE) {
  70                 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
  71                         cmd, request->status);
  72                 rc = -EIO;
  73         }
  74 out:
  75         kfree(request);
  76         return rc;
  77 }
  78
  79 /*
  80  * CPU configuration related functions.
  81  */
  82
  83 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
  84 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
  85
  86 int _sclp_get_core_info(struct sclp_core_info *info)
  87 {
  88         int rc;
  89         struct read_cpu_info_sccb *sccb;
  90
  91         if (!SCLP_HAS_CPU_INFO)
  92                 return -EOPNOTSUPP;
  93         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
  94         if (!sccb)
  95                 return -ENOMEM;
  96         sccb->header.length = sizeof(*sccb);
  97         rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
  98                                        SCLP_QUEUE_INTERVAL);
  99         if (rc)
 100                 goto out;
 101         if (sccb->header.response_code != 0x0010) {
 102                 pr_warn("readcpuinfo failed (response=0x%04x)\n",
 103                         sccb->header.response_code);
 104                 rc = -EIO;
 105                 goto out;
 106         }
 107         sclp_fill_core_info(info, sccb);
 108 out:
 109         free_page((unsigned long) sccb);
 110         return rc;
 111 }
 112
 113 struct cpu_configure_sccb {
 114         struct sccb_header header;
 115 } __attribute__((packed, aligned(8)));
 116
 117 static int do_core_configure(sclp_cmdw_t cmd)
 118 {
 119         struct cpu_configure_sccb *sccb;
 120         int rc;
 121
 122         if (!SCLP_HAS_CPU_RECONFIG)
 123                 return -EOPNOTSUPP;
 124         /*
 125          * This is not going to cross a page boundary since we force
 126          * kmalloc to have a minimum alignment of 8 bytes on s390.
 127          */
 128         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 129         if (!sccb)
 130                 return -ENOMEM;
 131         sccb->header.length = sizeof(*sccb);
 132         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 133         if (rc)
 134                 goto out;
 135         switch (sccb->header.response_code) {
 136         case 0x0020:
 137         case 0x0120:
 138                 break;
 139         default:
 140                 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
 141                         cmd, sccb->header.response_code);
 142                 rc = -EIO;
 143                 break;
 144         }
 145 out:
 146         kfree(sccb);
 147         return rc;
 148 }
 149
 150 int sclp_core_configure(u8 core)
 151 {
 152         return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
 153 }
 154
 155 int sclp_core_deconfigure(u8 core)
 156 {
 157         return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
 158 }
 159
 160 #ifdef CONFIG_MEMORY_HOTPLUG
 161
 162 static DEFINE_MUTEX(sclp_mem_mutex);
 163 static LIST_HEAD(sclp_mem_list);
 164 static u8 sclp_max_storage_id;
 165 static DECLARE_BITMAP(sclp_storage_ids, 256);
 166 static int sclp_mem_state_changed;
 167
 168 struct memory_increment {
 169         struct list_head list;
 170         u16 rn;
 171         int standby;
 172 };
 173
 174 struct assign_storage_sccb {
 175         struct sccb_header header;
 176         u16 rn;
 177 } __packed;
 178
 179 int arch_get_memory_phys_device(unsigned long start_pfn)
 180 {
 181         if (!sclp.rzm)
 182                 return 0;
 183         return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
 184 }
 185
 186 static unsigned long long rn2addr(u16 rn)
 187 {
 188         return (unsigned long long) (rn - 1) * sclp.rzm;
 189 }
 190
 191 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 192 {
 193         struct assign_storage_sccb *sccb;
 194         int rc;
 195
 196         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 197         if (!sccb)
 198                 return -ENOMEM;
 199         sccb->header.length = PAGE_SIZE;
 200         sccb->rn = rn;
 201         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 202         if (rc)
 203                 goto out;
 204         switch (sccb->header.response_code) {
 205         case 0x0020:
 206         case 0x0120:
 207                 break;
 208         default:
 209                 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
 210                         cmd, sccb->header.response_code, rn);
 211                 rc = -EIO;
 212                 break;
 213         }
 214 out:
 215         free_page((unsigned long) sccb);
 216         return rc;
 217 }
 218
 219 static int sclp_assign_storage(u16 rn)
 220 {
 221         unsigned long long start;
 222         int rc;
 223
 224         rc = do_assign_storage(0x000d0001, rn);
 225         if (rc)
 226                 return rc;
 227         start = rn2addr(rn);
 228         storage_key_init_range(start, start + sclp.rzm);
 229         return 0;
 230 }
 231
 232 static int sclp_unassign_storage(u16 rn)
 233 {
 234         return do_assign_storage(0x000c0001, rn);
 235 }
 236
 237 struct attach_storage_sccb {
 238         struct sccb_header header;
 239         u16 :16;
 240         u16 assigned;
 241         u32 :32;
 242         u32 entries[0];
 243 } __packed;
 244
 245 static int sclp_attach_storage(u8 id)
 246 {
 247         struct attach_storage_sccb *sccb;
 248         int rc;
 249         int i;
 250
 251         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 252         if (!sccb)
 253                 return -ENOMEM;
 254         sccb->header.length = PAGE_SIZE;
 255         rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
 256                                        SCLP_QUEUE_INTERVAL);
 257         if (rc)
 258                 goto out;
 259         switch (sccb->header.response_code) {
 260         case 0x0020:
 261                 set_bit(id, sclp_storage_ids);
 262                 for (i = 0; i < sccb->assigned; i++) {
 263                         if (sccb->entries[i])
 264                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 265                 }
 266                 break;
 267         default:
 268                 rc = -EIO;
 269                 break;
 270         }
 271 out:
 272         free_page((unsigned long) sccb);
 273         return rc;
 274 }
 275
 276 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 277                                  int online)
 278 {
 279         struct memory_increment *incr;
 280         unsigned long long istart;
 281         int rc = 0;
 282
 283         list_for_each_entry(incr, &sclp_mem_list, list) {
 284                 istart = rn2addr(incr->rn);
 285                 if (start + size - 1 < istart)
 286                         break;
 287                 if (start > istart + sclp.rzm - 1)
 288                         continue;
 289                 if (online)
 290                         rc |= sclp_assign_storage(incr->rn);
 291                 else
 292                         sclp_unassign_storage(incr->rn);
 293                 if (rc == 0)
 294                         incr->standby = online ? 0 : 1;
 295         }
 296         return rc ? -EIO : 0;
 297 }
 298
 299 static bool contains_standby_increment(unsigned long start, unsigned long end)
 300 {
 301         struct memory_increment *incr;
 302         unsigned long istart;
 303
 304         list_for_each_entry(incr, &sclp_mem_list, list) {
 305                 istart = rn2addr(incr->rn);
 306                 if (end - 1 < istart)
 307                         continue;
 308                 if (start > istart + sclp.rzm - 1)
 309                         continue;
 310                 if (incr->standby)
 311                         return true;
 312         }
 313         return false;
 314 }
 315
 316 static int sclp_mem_notifier(struct notifier_block *nb,
 317                              unsigned long action, void *data)
 318 {
 319         unsigned long start, size;
 320         struct memory_notify *arg;
 321         unsigned char id;
 322         int rc = 0;
 323
 324         arg = data;
 325         start = arg->start_pfn << PAGE_SHIFT;
 326         size = arg->nr_pages << PAGE_SHIFT;
 327         mutex_lock(&sclp_mem_mutex);
 328         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 329                 sclp_attach_storage(id);
 330         switch (action) {
 331         case MEM_GOING_OFFLINE:
 332                 /*
 333                  * We do not allow to set memory blocks offline that contain
 334                  * standby memory. This is done to simplify the "memory online"
 335                  * case.
 336                  */
 337                 if (contains_standby_increment(start, start + size))
 338                         rc = -EPERM;
 339                 break;
 340         case MEM_ONLINE:
 341         case MEM_CANCEL_OFFLINE:
 342                 break;
 343         case MEM_GOING_ONLINE:
 344                 rc = sclp_mem_change_state(start, size, 1);
 345                 break;
 346         case MEM_CANCEL_ONLINE:
 347                 sclp_mem_change_state(start, size, 0);
 348                 break;
 349         case MEM_OFFLINE:
 350                 sclp_mem_change_state(start, size, 0);
 351                 break;
 352         default:
 353                 rc = -EINVAL;
 354                 break;
 355         }
 356         if (!rc)
 357                 sclp_mem_state_changed = 1;
 358         mutex_unlock(&sclp_mem_mutex);
 359         return rc ? NOTIFY_BAD : NOTIFY_OK;
 360 }
 361
 362 static struct notifier_block sclp_mem_nb = {
 363         .notifier_call = sclp_mem_notifier,
 364 };
 365
 366 static void __init align_to_block_size(unsigned long long *start,
 367                                        unsigned long long *size,
 368                                        unsigned long long alignment)
 369 {
 370         unsigned long long start_align, size_align;
 371
 372         start_align = roundup(*start, alignment);
 373         size_align = rounddown(*start + *size, alignment) - start_align;
 374
 375         pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
 376                 *start, size_align >> 20, *size >> 20);
 377         *start = start_align;
 378         *size = size_align;
 379 }
 380
 381 static void __init add_memory_merged(u16 rn)
 382 {
 383         unsigned long long start, size, addr, block_size;
 384         static u16 first_rn, num;
 385
 386         if (rn && first_rn && (first_rn + num == rn)) {
 387                 num++;
 388                 return;
 389         }
 390         if (!first_rn)
 391                 goto skip_add;
 392         start = rn2addr(first_rn);
 393         size = (unsigned long long) num * sclp.rzm;
 394         if (start >= VMEM_MAX_PHYS)
 395                 goto skip_add;
 396         if (start + size > VMEM_MAX_PHYS)
 397                 size = VMEM_MAX_PHYS - start;
 398         if (memory_end_set && (start >= memory_end))
 399                 goto skip_add;
 400         if (memory_end_set && (start + size > memory_end))
 401                 size = memory_end - start;
 402         block_size = memory_block_size_bytes();
 403         align_to_block_size(&start, &size, block_size);
 404         if (!size)
 405                 goto skip_add;
 406         for (addr = start; addr < start + size; addr += block_size)
 407                 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
 408 skip_add:
 409         first_rn = rn;
 410         num = 1;
 411 }
 412
 413 static void __init sclp_add_standby_memory(void)
 414 {
 415         struct memory_increment *incr;
 416
 417         list_for_each_entry(incr, &sclp_mem_list, list)
 418                 if (incr->standby)
 419                         add_memory_merged(incr->rn);
 420         add_memory_merged(0);
 421 }
 422
 423 static void __init insert_increment(u16 rn, int standby, int assigned)
 424 {
 425         struct memory_increment *incr, *new_incr;
 426         struct list_head *prev;
 427         u16 last_rn;
 428
 429         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 430         if (!new_incr)
 431                 return;
 432         new_incr->rn = rn;
 433         new_incr->standby = standby;
 434         last_rn = 0;
 435         prev = &sclp_mem_list;
 436         list_for_each_entry(incr, &sclp_mem_list, list) {
 437                 if (assigned && incr->rn > rn)
 438                         break;
 439                 if (!assigned && incr->rn - last_rn > 1)
 440                         break;
 441                 last_rn = incr->rn;
 442                 prev = &incr->list;
 443         }
 444         if (!assigned)
 445                 new_incr->rn = last_rn + 1;
 446         if (new_incr->rn > sclp.rnmax) {
 447                 kfree(new_incr);
 448                 return;
 449         }
 450         list_add(&new_incr->list, prev);
 451 }
 452
 453 static int sclp_mem_freeze(struct device *dev)
 454 {
 455         if (!sclp_mem_state_changed)
 456                 return 0;
 457         pr_err("Memory hotplug state changed, suspend refused.\n");
 458         return -EPERM;
 459 }
 460
 461 struct read_storage_sccb {
 462         struct sccb_header header;
 463         u16 max_id;
 464         u16 assigned;
 465         u16 standby;
 466         u16 :16;
 467         u32 entries[0];
 468 } __packed;
 469
 470 static const struct dev_pm_ops sclp_mem_pm_ops = {
 471         .freeze         = sclp_mem_freeze,
 472 };
 473
 474 static struct platform_driver sclp_mem_pdrv = {
 475         .driver = {
 476                 .name   = "sclp_mem",
 477                 .pm     = &sclp_mem_pm_ops,
 478         },
 479 };
 480
 481 static int __init sclp_detect_standby_memory(void)
 482 {
 483         struct platform_device *sclp_pdev;
 484         struct read_storage_sccb *sccb;
 485         int i, id, assigned, rc;
 486
 487         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 488                 return 0;
 489         if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 490                 return 0;
 491         rc = -ENOMEM;
 492         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 493         if (!sccb)
 494                 goto out;
 495         assigned = 0;
 496         for (id = 0; id <= sclp_max_storage_id; id++) {
 497                 memset(sccb, 0, PAGE_SIZE);
 498                 sccb->header.length = PAGE_SIZE;
 499                 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
 500                 if (rc)
 501                         goto out;
 502                 switch (sccb->header.response_code) {
 503                 case 0x0010:
 504                         set_bit(id, sclp_storage_ids);
 505                         for (i = 0; i < sccb->assigned; i++) {
 506                                 if (!sccb->entries[i])
 507                                         continue;
 508                                 assigned++;
 509                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 510                         }
 511                         break;
 512                 case 0x0310:
 513                         break;
 514                 case 0x0410:
 515                         for (i = 0; i < sccb->assigned; i++) {
 516                                 if (!sccb->entries[i])
 517                                         continue;
 518                                 assigned++;
 519                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 520                         }
 521                         break;
 522                 default:
 523                         rc = -EIO;
 524                         break;
 525                 }
 526                 if (!rc)
 527                         sclp_max_storage_id = sccb->max_id;
 528         }
 529         if (rc || list_empty(&sclp_mem_list))
 530                 goto out;
 531         for (i = 1; i <= sclp.rnmax - assigned; i++)
 532                 insert_increment(0, 1, 0);
 533         rc = register_memory_notifier(&sclp_mem_nb);
 534         if (rc)
 535                 goto out;
 536         rc = platform_driver_register(&sclp_mem_pdrv);
 537         if (rc)
 538                 goto out;
 539         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 540         rc = PTR_ERR_OR_ZERO(sclp_pdev);
 541         if (rc)
 542                 goto out_driver;
 543         sclp_add_standby_memory();
 544         goto out;
 545 out_driver:
 546         platform_driver_unregister(&sclp_mem_pdrv);
 547 out:
 548         free_page((unsigned long) sccb);
 549         return rc;
 550 }
 551 __initcall(sclp_detect_standby_memory);
 552
 553 #endif /* CONFIG_MEMORY_HOTPLUG */
 554
 555 /*
 556  * Channel path configuration related functions.
 557  */
 558
 559 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 560 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 561 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 562
 563 struct chp_cfg_sccb {
 564         struct sccb_header header;
 565         u8 ccm;
 566         u8 reserved[6];
 567         u8 cssid;
 568 } __attribute__((packed));
 569
 570 static int do_chp_configure(sclp_cmdw_t cmd)
 571 {
 572         struct chp_cfg_sccb *sccb;
 573         int rc;
 574
 575         if (!SCLP_HAS_CHP_RECONFIG)
 576                 return -EOPNOTSUPP;
 577         /* Prepare sccb. */
 578         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 579         if (!sccb)
 580                 return -ENOMEM;
 581         sccb->header.length = sizeof(*sccb);
 582         rc = sclp_sync_request(cmd, sccb);
 583         if (rc)
 584                 goto out;
 585         switch (sccb->header.response_code) {
 586         case 0x0020:
 587         case 0x0120:
 588         case 0x0440:
 589         case 0x0450:
 590                 break;
 591         default:
 592                 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
 593                         cmd, sccb->header.response_code);
 594                 rc = -EIO;
 595                 break;
 596         }
 597 out:
 598         free_page((unsigned long) sccb);
 599         return rc;
 600 }
 601
 602 /**
 603  * sclp_chp_configure - perform configure channel-path sclp command
 604  * @chpid: channel-path ID
 605  *
 606  * Perform configure channel-path command sclp command for specified chpid.
 607  * Return 0 after command successfully finished, non-zero otherwise.
 608  */
 609 int sclp_chp_configure(struct chp_id chpid)
 610 {
 611         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 612 }
 613
 614 /**
 615  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 616  * @chpid: channel-path ID
 617  *
 618  * Perform deconfigure channel-path command sclp command for specified chpid
 619  * and wait for completion. On success return 0. Return non-zero otherwise.
 620  */
 621 int sclp_chp_deconfigure(struct chp_id chpid)
 622 {
 623         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 624 }
 625
 626 struct chp_info_sccb {
 627         struct sccb_header header;
 628         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 629         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 630         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 631         u8 ccm;
 632         u8 reserved[6];
 633         u8 cssid;
 634 } __attribute__((packed));
 635
 636 /**
 637  * sclp_chp_read_info - perform read channel-path information sclp command
 638  * @info: resulting channel-path information data
 639  *
 640  * Perform read channel-path information sclp command and wait for completion.
 641  * On success, store channel-path information in @info and return 0. Return
 642  * non-zero otherwise.
 643  */
 644 int sclp_chp_read_info(struct sclp_chp_info *info)
 645 {
 646         struct chp_info_sccb *sccb;
 647         int rc;
 648
 649         if (!SCLP_HAS_CHP_INFO)
 650                 return -EOPNOTSUPP;
 651         /* Prepare sccb. */
 652         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 653         if (!sccb)
 654                 return -ENOMEM;
 655         sccb->header.length = sizeof(*sccb);
 656         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 657         if (rc)
 658                 goto out;
 659         if (sccb->header.response_code != 0x0010) {
 660                 pr_warn("read channel-path info failed (response=0x%04x)\n",
 661                         sccb->header.response_code);
 662                 rc = -EIO;
 663                 goto out;
 664         }
 665         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 666         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 667         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 668 out:
 669         free_page((unsigned long) sccb);
 670         return rc;
 671 }