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