drivers/s390/char/sclp_cmd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2007,2012
   4  *
   5  * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
   6  *            Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "sclp_cmd"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/completion.h>
  13 #include <linux/init.h>
  14 #include <linux/errno.h>
  15 #include <linux/err.h>
  16 #include <linux/export.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19 #include <linux/mm.h>
  20 #include <linux/mmzone.h>
  21 #include <linux/memory.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24 #include <asm/ctl_reg.h>
  25 #include <asm/chpid.h>
  26 #include <asm/setup.h>
  27 #include <asm/page.h>
  28 #include <asm/sclp.h>
  29 #include <asm/numa.h>
  30 #include <asm/facility.h>
  31
  32 #include "sclp.h"
  33
  34 static void sclp_sync_callback(struct sclp_req *req, void *data)
  35 {
  36         struct completion *completion = data;
  37
  38         complete(completion);
  39 }
  40
  41 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
  42 {
  43         return sclp_sync_request_timeout(cmd, sccb, 0);
  44 }
  45
  46 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
  47 {
  48         struct completion completion;
  49         struct sclp_req *request;
  50         int rc;
  51
  52         request = kzalloc(sizeof(*request), GFP_KERNEL);
  53         if (!request)
  54                 return -ENOMEM;
  55         if (timeout)
  56                 request->queue_timeout = timeout;
  57         request->command = cmd;
  58         request->sccb = sccb;
  59         request->status = SCLP_REQ_FILLED;
  60         request->callback = sclp_sync_callback;
  61         request->callback_data = &completion;
  62         init_completion(&completion);
  63
  64         /* Perform sclp request. */
  65         rc = sclp_add_request(request);
  66         if (rc)
  67                 goto out;
  68         wait_for_completion(&completion);
  69
  70         /* Check response. */
  71         if (request->status != SCLP_REQ_DONE) {
  72                 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
  73                         cmd, request->status);
  74                 rc = -EIO;
  75         }
  76 out:
  77         kfree(request);
  78         return rc;
  79 }
  80
  81 /*
  82  * CPU configuration related functions.
  83  */
  84
  85 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
  86 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
  87
  88 int _sclp_get_core_info(struct sclp_core_info *info)
  89 {
  90         int rc;
  91         int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
  92         struct read_cpu_info_sccb *sccb;
  93
  94         if (!SCLP_HAS_CPU_INFO)
  95                 return -EOPNOTSUPP;
  96
  97         sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
  98         if (!sccb)
  99                 return -ENOMEM;
 100         sccb->header.length = length;
 101         sccb->header.control_mask[2] = 0x80;
 102         rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
 103                                        SCLP_QUEUE_INTERVAL);
 104         if (rc)
 105                 goto out;
 106         if (sccb->header.response_code != 0x0010) {
 107                 pr_warn("readcpuinfo failed (response=0x%04x)\n",
 108                         sccb->header.response_code);
 109                 rc = -EIO;
 110                 goto out;
 111         }
 112         sclp_fill_core_info(info, sccb);
 113 out:
 114         free_pages((unsigned long) sccb, get_order(length));
 115         return rc;
 116 }
 117
 118 struct cpu_configure_sccb {
 119         struct sccb_header header;
 120 } __attribute__((packed, aligned(8)));
 121
 122 static int do_core_configure(sclp_cmdw_t cmd)
 123 {
 124         struct cpu_configure_sccb *sccb;
 125         int rc;
 126
 127         if (!SCLP_HAS_CPU_RECONFIG)
 128                 return -EOPNOTSUPP;
 129         /*
 130          * This is not going to cross a page boundary since we force
 131          * kmalloc to have a minimum alignment of 8 bytes on s390.
 132          */
 133         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 134         if (!sccb)
 135                 return -ENOMEM;
 136         sccb->header.length = sizeof(*sccb);
 137         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 138         if (rc)
 139                 goto out;
 140         switch (sccb->header.response_code) {
 141         case 0x0020:
 142         case 0x0120:
 143                 break;
 144         default:
 145                 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
 146                         cmd, sccb->header.response_code);
 147                 rc = -EIO;
 148                 break;
 149         }
 150 out:
 151         kfree(sccb);
 152         return rc;
 153 }
 154
 155 int sclp_core_configure(u8 core)
 156 {
 157         return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
 158 }
 159
 160 int sclp_core_deconfigure(u8 core)
 161 {
 162         return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
 163 }
 164
 165 #ifdef CONFIG_MEMORY_HOTPLUG
 166
 167 static DEFINE_MUTEX(sclp_mem_mutex);
 168 static LIST_HEAD(sclp_mem_list);
 169 static u8 sclp_max_storage_id;
 170 static DECLARE_BITMAP(sclp_storage_ids, 256);
 171 static int sclp_mem_state_changed;
 172
 173 struct memory_increment {
 174         struct list_head list;
 175         u16 rn;
 176         int standby;
 177 };
 178
 179 struct assign_storage_sccb {
 180         struct sccb_header header;
 181         u16 rn;
 182 } __packed;
 183
 184 int arch_get_memory_phys_device(unsigned long start_pfn)
 185 {
 186         if (!sclp.rzm)
 187                 return 0;
 188         return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
 189 }
 190
 191 static unsigned long long rn2addr(u16 rn)
 192 {
 193         return (unsigned long long) (rn - 1) * sclp.rzm;
 194 }
 195
 196 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 197 {
 198         struct assign_storage_sccb *sccb;
 199         int rc;
 200
 201         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 202         if (!sccb)
 203                 return -ENOMEM;
 204         sccb->header.length = PAGE_SIZE;
 205         sccb->rn = rn;
 206         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 207         if (rc)
 208                 goto out;
 209         switch (sccb->header.response_code) {
 210         case 0x0020:
 211         case 0x0120:
 212                 break;
 213         default:
 214                 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
 215                         cmd, sccb->header.response_code, rn);
 216                 rc = -EIO;
 217                 break;
 218         }
 219 out:
 220         free_page((unsigned long) sccb);
 221         return rc;
 222 }
 223
 224 static int sclp_assign_storage(u16 rn)
 225 {
 226         unsigned long long start;
 227         int rc;
 228
 229         rc = do_assign_storage(0x000d0001, rn);
 230         if (rc)
 231                 return rc;
 232         start = rn2addr(rn);
 233         storage_key_init_range(start, start + sclp.rzm);
 234         return 0;
 235 }
 236
 237 static int sclp_unassign_storage(u16 rn)
 238 {
 239         return do_assign_storage(0x000c0001, rn);
 240 }
 241
 242 struct attach_storage_sccb {
 243         struct sccb_header header;
 244         u16 :16;
 245         u16 assigned;
 246         u32 :32;
 247         u32 entries[0];
 248 } __packed;
 249
 250 static int sclp_attach_storage(u8 id)
 251 {
 252         struct attach_storage_sccb *sccb;
 253         int rc;
 254         int i;
 255
 256         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 257         if (!sccb)
 258                 return -ENOMEM;
 259         sccb->header.length = PAGE_SIZE;
 260         sccb->header.function_code = 0x40;
 261         rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
 262                                        SCLP_QUEUE_INTERVAL);
 263         if (rc)
 264                 goto out;
 265         switch (sccb->header.response_code) {
 266         case 0x0020:
 267                 set_bit(id, sclp_storage_ids);
 268                 for (i = 0; i < sccb->assigned; i++) {
 269                         if (sccb->entries[i])
 270                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 271                 }
 272                 break;
 273         default:
 274                 rc = -EIO;
 275                 break;
 276         }
 277 out:
 278         free_page((unsigned long) sccb);
 279         return rc;
 280 }
 281
 282 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 283                                  int online)
 284 {
 285         struct memory_increment *incr;
 286         unsigned long long istart;
 287         int rc = 0;
 288
 289         list_for_each_entry(incr, &sclp_mem_list, list) {
 290                 istart = rn2addr(incr->rn);
 291                 if (start + size - 1 < istart)
 292                         break;
 293                 if (start > istart + sclp.rzm - 1)
 294                         continue;
 295                 if (online)
 296                         rc |= sclp_assign_storage(incr->rn);
 297                 else
 298                         sclp_unassign_storage(incr->rn);
 299                 if (rc == 0)
 300                         incr->standby = online ? 0 : 1;
 301         }
 302         return rc ? -EIO : 0;
 303 }
 304
 305 static bool contains_standby_increment(unsigned long start, unsigned long end)
 306 {
 307         struct memory_increment *incr;
 308         unsigned long istart;
 309
 310         list_for_each_entry(incr, &sclp_mem_list, list) {
 311                 istart = rn2addr(incr->rn);
 312                 if (end - 1 < istart)
 313                         continue;
 314                 if (start > istart + sclp.rzm - 1)
 315                         continue;
 316                 if (incr->standby)
 317                         return true;
 318         }
 319         return false;
 320 }
 321
 322 static int sclp_mem_notifier(struct notifier_block *nb,
 323                              unsigned long action, void *data)
 324 {
 325         unsigned long start, size;
 326         struct memory_notify *arg;
 327         unsigned char id;
 328         int rc = 0;
 329
 330         arg = data;
 331         start = arg->start_pfn << PAGE_SHIFT;
 332         size = arg->nr_pages << PAGE_SHIFT;
 333         mutex_lock(&sclp_mem_mutex);
 334         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 335                 sclp_attach_storage(id);
 336         switch (action) {
 337         case MEM_GOING_OFFLINE:
 338                 /*
 339                  * We do not allow to set memory blocks offline that contain
 340                  * standby memory. This is done to simplify the "memory online"
 341                  * case.
 342                  */
 343                 if (contains_standby_increment(start, start + size))
 344                         rc = -EPERM;
 345                 break;
 346         case MEM_ONLINE:
 347         case MEM_CANCEL_OFFLINE:
 348                 break;
 349         case MEM_GOING_ONLINE:
 350                 rc = sclp_mem_change_state(start, size, 1);
 351                 break;
 352         case MEM_CANCEL_ONLINE:
 353                 sclp_mem_change_state(start, size, 0);
 354                 break;
 355         case MEM_OFFLINE:
 356                 sclp_mem_change_state(start, size, 0);
 357                 break;
 358         default:
 359                 rc = -EINVAL;
 360                 break;
 361         }
 362         if (!rc)
 363                 sclp_mem_state_changed = 1;
 364         mutex_unlock(&sclp_mem_mutex);
 365         return rc ? NOTIFY_BAD : NOTIFY_OK;
 366 }
 367
 368 static struct notifier_block sclp_mem_nb = {
 369         .notifier_call = sclp_mem_notifier,
 370 };
 371
 372 static void __init align_to_block_size(unsigned long long *start,
 373                                        unsigned long long *size,
 374                                        unsigned long long alignment)
 375 {
 376         unsigned long long start_align, size_align;
 377
 378         start_align = roundup(*start, alignment);
 379         size_align = rounddown(*start + *size, alignment) - start_align;
 380
 381         pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
 382                 *start, size_align >> 20, *size >> 20);
 383         *start = start_align;
 384         *size = size_align;
 385 }
 386
 387 static void __init add_memory_merged(u16 rn)
 388 {
 389         unsigned long long start, size, addr, block_size;
 390         static u16 first_rn, num;
 391
 392         if (rn && first_rn && (first_rn + num == rn)) {
 393                 num++;
 394                 return;
 395         }
 396         if (!first_rn)
 397                 goto skip_add;
 398         start = rn2addr(first_rn);
 399         size = (unsigned long long) num * sclp.rzm;
 400         if (start >= VMEM_MAX_PHYS)
 401                 goto skip_add;
 402         if (start + size > VMEM_MAX_PHYS)
 403                 size = VMEM_MAX_PHYS - start;
 404         if (start >= ident_map_size)
 405                 goto skip_add;
 406         if (start + size > ident_map_size)
 407                 size = ident_map_size - start;
 408         block_size = memory_block_size_bytes();
 409         align_to_block_size(&start, &size, block_size);
 410         if (!size)
 411                 goto skip_add;
 412         for (addr = start; addr < start + size; addr += block_size)
 413                 add_memory(0, addr, block_size, MHP_NONE);
 414 skip_add:
 415         first_rn = rn;
 416         num = 1;
 417 }
 418
 419 static void __init sclp_add_standby_memory(void)
 420 {
 421         struct memory_increment *incr;
 422
 423         list_for_each_entry(incr, &sclp_mem_list, list)
 424                 if (incr->standby)
 425                         add_memory_merged(incr->rn);
 426         add_memory_merged(0);
 427 }
 428
 429 static void __init insert_increment(u16 rn, int standby, int assigned)
 430 {
 431         struct memory_increment *incr, *new_incr;
 432         struct list_head *prev;
 433         u16 last_rn;
 434
 435         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 436         if (!new_incr)
 437                 return;
 438         new_incr->rn = rn;
 439         new_incr->standby = standby;
 440         last_rn = 0;
 441         prev = &sclp_mem_list;
 442         list_for_each_entry(incr, &sclp_mem_list, list) {
 443                 if (assigned && incr->rn > rn)
 444                         break;
 445                 if (!assigned && incr->rn - last_rn > 1)
 446                         break;
 447                 last_rn = incr->rn;
 448                 prev = &incr->list;
 449         }
 450         if (!assigned)
 451                 new_incr->rn = last_rn + 1;
 452         if (new_incr->rn > sclp.rnmax) {
 453                 kfree(new_incr);
 454                 return;
 455         }
 456         list_add(&new_incr->list, prev);
 457 }
 458
 459 static int sclp_mem_freeze(struct device *dev)
 460 {
 461         if (!sclp_mem_state_changed)
 462                 return 0;
 463         pr_err("Memory hotplug state changed, suspend refused.\n");
 464         return -EPERM;
 465 }
 466
 467 static const struct dev_pm_ops sclp_mem_pm_ops = {
 468         .freeze         = sclp_mem_freeze,
 469 };
 470
 471 static struct platform_driver sclp_mem_pdrv = {
 472         .driver = {
 473                 .name   = "sclp_mem",
 474                 .pm     = &sclp_mem_pm_ops,
 475         },
 476 };
 477
 478 static int __init sclp_detect_standby_memory(void)
 479 {
 480         struct platform_device *sclp_pdev;
 481         struct read_storage_sccb *sccb;
 482         int i, id, assigned, rc;
 483
 484         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 485                 return 0;
 486         if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 487                 return 0;
 488         rc = -ENOMEM;
 489         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 490         if (!sccb)
 491                 goto out;
 492         assigned = 0;
 493         for (id = 0; id <= sclp_max_storage_id; id++) {
 494                 memset(sccb, 0, PAGE_SIZE);
 495                 sccb->header.length = PAGE_SIZE;
 496                 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
 497                 if (rc)
 498                         goto out;
 499                 switch (sccb->header.response_code) {
 500                 case 0x0010:
 501                         set_bit(id, sclp_storage_ids);
 502                         for (i = 0; i < sccb->assigned; i++) {
 503                                 if (!sccb->entries[i])
 504                                         continue;
 505                                 assigned++;
 506                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 507                         }
 508                         break;
 509                 case 0x0310:
 510                         break;
 511                 case 0x0410:
 512                         for (i = 0; i < sccb->assigned; i++) {
 513                                 if (!sccb->entries[i])
 514                                         continue;
 515                                 assigned++;
 516                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 517                         }
 518                         break;
 519                 default:
 520                         rc = -EIO;
 521                         break;
 522                 }
 523                 if (!rc)
 524                         sclp_max_storage_id = sccb->max_id;
 525         }
 526         if (rc || list_empty(&sclp_mem_list))
 527                 goto out;
 528         for (i = 1; i <= sclp.rnmax - assigned; i++)
 529                 insert_increment(0, 1, 0);
 530         rc = register_memory_notifier(&sclp_mem_nb);
 531         if (rc)
 532                 goto out;
 533         rc = platform_driver_register(&sclp_mem_pdrv);
 534         if (rc)
 535                 goto out;
 536         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 537         rc = PTR_ERR_OR_ZERO(sclp_pdev);
 538         if (rc)
 539                 goto out_driver;
 540         sclp_add_standby_memory();
 541         goto out;
 542 out_driver:
 543         platform_driver_unregister(&sclp_mem_pdrv);
 544 out:
 545         free_page((unsigned long) sccb);
 546         return rc;
 547 }
 548 __initcall(sclp_detect_standby_memory);
 549
 550 #endif /* CONFIG_MEMORY_HOTPLUG */
 551
 552 /*
 553  * Channel path configuration related functions.
 554  */
 555
 556 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 557 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 558 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 559
 560 struct chp_cfg_sccb {
 561         struct sccb_header header;
 562         u8 ccm;
 563         u8 reserved[6];
 564         u8 cssid;
 565 } __attribute__((packed));
 566
 567 static int do_chp_configure(sclp_cmdw_t cmd)
 568 {
 569         struct chp_cfg_sccb *sccb;
 570         int rc;
 571
 572         if (!SCLP_HAS_CHP_RECONFIG)
 573                 return -EOPNOTSUPP;
 574         /* Prepare sccb. */
 575         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 576         if (!sccb)
 577                 return -ENOMEM;
 578         sccb->header.length = sizeof(*sccb);
 579         rc = sclp_sync_request(cmd, sccb);
 580         if (rc)
 581                 goto out;
 582         switch (sccb->header.response_code) {
 583         case 0x0020:
 584         case 0x0120:
 585         case 0x0440:
 586         case 0x0450:
 587                 break;
 588         default:
 589                 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
 590                         cmd, sccb->header.response_code);
 591                 rc = -EIO;
 592                 break;
 593         }
 594 out:
 595         free_page((unsigned long) sccb);
 596         return rc;
 597 }
 598
 599 /**
 600  * sclp_chp_configure - perform configure channel-path sclp command
 601  * @chpid: channel-path ID
 602  *
 603  * Perform configure channel-path command sclp command for specified chpid.
 604  * Return 0 after command successfully finished, non-zero otherwise.
 605  */
 606 int sclp_chp_configure(struct chp_id chpid)
 607 {
 608         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 609 }
 610
 611 /**
 612  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 613  * @chpid: channel-path ID
 614  *
 615  * Perform deconfigure channel-path command sclp command for specified chpid
 616  * and wait for completion. On success return 0. Return non-zero otherwise.
 617  */
 618 int sclp_chp_deconfigure(struct chp_id chpid)
 619 {
 620         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 621 }
 622
 623 struct chp_info_sccb {
 624         struct sccb_header header;
 625         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 626         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 627         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 628         u8 ccm;
 629         u8 reserved[6];
 630         u8 cssid;
 631 } __attribute__((packed));
 632
 633 /**
 634  * sclp_chp_read_info - perform read channel-path information sclp command
 635  * @info: resulting channel-path information data
 636  *
 637  * Perform read channel-path information sclp command and wait for completion.
 638  * On success, store channel-path information in @info and return 0. Return
 639  * non-zero otherwise.
 640  */
 641 int sclp_chp_read_info(struct sclp_chp_info *info)
 642 {
 643         struct chp_info_sccb *sccb;
 644         int rc;
 645
 646         if (!SCLP_HAS_CHP_INFO)
 647                 return -EOPNOTSUPP;
 648         /* Prepare sccb. */
 649         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 650         if (!sccb)
 651                 return -ENOMEM;
 652         sccb->header.length = sizeof(*sccb);
 653         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 654         if (rc)
 655                 goto out;
 656         if (sccb->header.response_code != 0x0010) {
 657                 pr_warn("read channel-path info failed (response=0x%04x)\n",
 658                         sccb->header.response_code);
 659                 rc = -EIO;
 660                 goto out;
 661         }
 662         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 663         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 664         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 665 out:
 666         free_page((unsigned long) sccb);
 667         return rc;
 668 }