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
  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         struct read_cpu_info_sccb *sccb;
  91
  92         if (!SCLP_HAS_CPU_INFO)
  93                 return -EOPNOTSUPP;
  94         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
  95         if (!sccb)
  96                 return -ENOMEM;
  97         sccb->header.length = sizeof(*sccb);
  98         rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
  99                                        SCLP_QUEUE_INTERVAL);
 100         if (rc)
 101                 goto out;
 102         if (sccb->header.response_code != 0x0010) {
 103                 pr_warn("readcpuinfo failed (response=0x%04x)\n",
 104                         sccb->header.response_code);
 105                 rc = -EIO;
 106                 goto out;
 107         }
 108         sclp_fill_core_info(info, sccb);
 109 out:
 110         free_page((unsigned long) sccb);
 111         return rc;
 112 }
 113
 114 struct cpu_configure_sccb {
 115         struct sccb_header header;
 116 } __attribute__((packed, aligned(8)));
 117
 118 static int do_core_configure(sclp_cmdw_t cmd)
 119 {
 120         struct cpu_configure_sccb *sccb;
 121         int rc;
 122
 123         if (!SCLP_HAS_CPU_RECONFIG)
 124                 return -EOPNOTSUPP;
 125         /*
 126          * This is not going to cross a page boundary since we force
 127          * kmalloc to have a minimum alignment of 8 bytes on s390.
 128          */
 129         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 130         if (!sccb)
 131                 return -ENOMEM;
 132         sccb->header.length = sizeof(*sccb);
 133         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 134         if (rc)
 135                 goto out;
 136         switch (sccb->header.response_code) {
 137         case 0x0020:
 138         case 0x0120:
 139                 break;
 140         default:
 141                 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
 142                         cmd, sccb->header.response_code);
 143                 rc = -EIO;
 144                 break;
 145         }
 146 out:
 147         kfree(sccb);
 148         return rc;
 149 }
 150
 151 int sclp_core_configure(u8 core)
 152 {
 153         return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
 154 }
 155
 156 int sclp_core_deconfigure(u8 core)
 157 {
 158         return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
 159 }
 160
 161 #ifdef CONFIG_MEMORY_HOTPLUG
 162
 163 static DEFINE_MUTEX(sclp_mem_mutex);
 164 static LIST_HEAD(sclp_mem_list);
 165 static u8 sclp_max_storage_id;
 166 static DECLARE_BITMAP(sclp_storage_ids, 256);
 167 static int sclp_mem_state_changed;
 168
 169 struct memory_increment {
 170         struct list_head list;
 171         u16 rn;
 172         int standby;
 173 };
 174
 175 struct assign_storage_sccb {
 176         struct sccb_header header;
 177         u16 rn;
 178 } __packed;
 179
 180 int arch_get_memory_phys_device(unsigned long start_pfn)
 181 {
 182         if (!sclp.rzm)
 183                 return 0;
 184         return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
 185 }
 186
 187 static unsigned long long rn2addr(u16 rn)
 188 {
 189         return (unsigned long long) (rn - 1) * sclp.rzm;
 190 }
 191
 192 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 193 {
 194         struct assign_storage_sccb *sccb;
 195         int rc;
 196
 197         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 198         if (!sccb)
 199                 return -ENOMEM;
 200         sccb->header.length = PAGE_SIZE;
 201         sccb->rn = rn;
 202         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 203         if (rc)
 204                 goto out;
 205         switch (sccb->header.response_code) {
 206         case 0x0020:
 207         case 0x0120:
 208                 break;
 209         default:
 210                 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
 211                         cmd, sccb->header.response_code, rn);
 212                 rc = -EIO;
 213                 break;
 214         }
 215 out:
 216         free_page((unsigned long) sccb);
 217         return rc;
 218 }
 219
 220 static int sclp_assign_storage(u16 rn)
 221 {
 222         unsigned long long start;
 223         int rc;
 224
 225         rc = do_assign_storage(0x000d0001, rn);
 226         if (rc)
 227                 return rc;
 228         start = rn2addr(rn);
 229         storage_key_init_range(start, start + sclp.rzm);
 230         return 0;
 231 }
 232
 233 static int sclp_unassign_storage(u16 rn)
 234 {
 235         return do_assign_storage(0x000c0001, rn);
 236 }
 237
 238 struct attach_storage_sccb {
 239         struct sccb_header header;
 240         u16 :16;
 241         u16 assigned;
 242         u32 :32;
 243         u32 entries[0];
 244 } __packed;
 245
 246 static int sclp_attach_storage(u8 id)
 247 {
 248         struct attach_storage_sccb *sccb;
 249         int rc;
 250         int i;
 251
 252         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 253         if (!sccb)
 254                 return -ENOMEM;
 255         sccb->header.length = PAGE_SIZE;
 256         sccb->header.function_code = 0x40;
 257         rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
 258                                        SCLP_QUEUE_INTERVAL);
 259         if (rc)
 260                 goto out;
 261         switch (sccb->header.response_code) {
 262         case 0x0020:
 263                 set_bit(id, sclp_storage_ids);
 264                 for (i = 0; i < sccb->assigned; i++) {
 265                         if (sccb->entries[i])
 266                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 267                 }
 268                 break;
 269         default:
 270                 rc = -EIO;
 271                 break;
 272         }
 273 out:
 274         free_page((unsigned long) sccb);
 275         return rc;
 276 }
 277
 278 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 279                                  int online)
 280 {
 281         struct memory_increment *incr;
 282         unsigned long long istart;
 283         int rc = 0;
 284
 285         list_for_each_entry(incr, &sclp_mem_list, list) {
 286                 istart = rn2addr(incr->rn);
 287                 if (start + size - 1 < istart)
 288                         break;
 289                 if (start > istart + sclp.rzm - 1)
 290                         continue;
 291                 if (online)
 292                         rc |= sclp_assign_storage(incr->rn);
 293                 else
 294                         sclp_unassign_storage(incr->rn);
 295                 if (rc == 0)
 296                         incr->standby = online ? 0 : 1;
 297         }
 298         return rc ? -EIO : 0;
 299 }
 300
 301 static bool contains_standby_increment(unsigned long start, unsigned long end)
 302 {
 303         struct memory_increment *incr;
 304         unsigned long istart;
 305
 306         list_for_each_entry(incr, &sclp_mem_list, list) {
 307                 istart = rn2addr(incr->rn);
 308                 if (end - 1 < istart)
 309                         continue;
 310                 if (start > istart + sclp.rzm - 1)
 311                         continue;
 312                 if (incr->standby)
 313                         return true;
 314         }
 315         return false;
 316 }
 317
 318 static int sclp_mem_notifier(struct notifier_block *nb,
 319                              unsigned long action, void *data)
 320 {
 321         unsigned long start, size;
 322         struct memory_notify *arg;
 323         unsigned char id;
 324         int rc = 0;
 325
 326         arg = data;
 327         start = arg->start_pfn << PAGE_SHIFT;
 328         size = arg->nr_pages << PAGE_SHIFT;
 329         mutex_lock(&sclp_mem_mutex);
 330         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 331                 sclp_attach_storage(id);
 332         switch (action) {
 333         case MEM_GOING_OFFLINE:
 334                 /*
 335                  * We do not allow to set memory blocks offline that contain
 336                  * standby memory. This is done to simplify the "memory online"
 337                  * case.
 338                  */
 339                 if (contains_standby_increment(start, start + size))
 340                         rc = -EPERM;
 341                 break;
 342         case MEM_ONLINE:
 343         case MEM_CANCEL_OFFLINE:
 344                 break;
 345         case MEM_GOING_ONLINE:
 346                 rc = sclp_mem_change_state(start, size, 1);
 347                 break;
 348         case MEM_CANCEL_ONLINE:
 349                 sclp_mem_change_state(start, size, 0);
 350                 break;
 351         case MEM_OFFLINE:
 352                 sclp_mem_change_state(start, size, 0);
 353                 break;
 354         default:
 355                 rc = -EINVAL;
 356                 break;
 357         }
 358         if (!rc)
 359                 sclp_mem_state_changed = 1;
 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 (memory_end_set && (start >= memory_end))
 401                 goto skip_add;
 402         if (memory_end_set && (start + size > memory_end))
 403                 size = memory_end - 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(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
 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 sclp_mem_freeze(struct device *dev)
 456 {
 457         if (!sclp_mem_state_changed)
 458                 return 0;
 459         pr_err("Memory hotplug state changed, suspend refused.\n");
 460         return -EPERM;
 461 }
 462
 463 struct read_storage_sccb {
 464         struct sccb_header header;
 465         u16 max_id;
 466         u16 assigned;
 467         u16 standby;
 468         u16 :16;
 469         u32 entries[0];
 470 } __packed;
 471
 472 static const struct dev_pm_ops sclp_mem_pm_ops = {
 473         .freeze         = sclp_mem_freeze,
 474 };
 475
 476 static struct platform_driver sclp_mem_pdrv = {
 477         .driver = {
 478                 .name   = "sclp_mem",
 479                 .pm     = &sclp_mem_pm_ops,
 480         },
 481 };
 482
 483 static int __init sclp_detect_standby_memory(void)
 484 {
 485         struct platform_device *sclp_pdev;
 486         struct read_storage_sccb *sccb;
 487         int i, id, assigned, rc;
 488
 489         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 490                 return 0;
 491         if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 492                 return 0;
 493         rc = -ENOMEM;
 494         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 495         if (!sccb)
 496                 goto out;
 497         assigned = 0;
 498         for (id = 0; id <= sclp_max_storage_id; id++) {
 499                 memset(sccb, 0, PAGE_SIZE);
 500                 sccb->header.length = PAGE_SIZE;
 501                 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
 502                 if (rc)
 503                         goto out;
 504                 switch (sccb->header.response_code) {
 505                 case 0x0010:
 506                         set_bit(id, sclp_storage_ids);
 507                         for (i = 0; i < sccb->assigned; i++) {
 508                                 if (!sccb->entries[i])
 509                                         continue;
 510                                 assigned++;
 511                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 512                         }
 513                         break;
 514                 case 0x0310:
 515                         break;
 516                 case 0x0410:
 517                         for (i = 0; i < sccb->assigned; i++) {
 518                                 if (!sccb->entries[i])
 519                                         continue;
 520                                 assigned++;
 521                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 522                         }
 523                         break;
 524                 default:
 525                         rc = -EIO;
 526                         break;
 527                 }
 528                 if (!rc)
 529                         sclp_max_storage_id = sccb->max_id;
 530         }
 531         if (rc || list_empty(&sclp_mem_list))
 532                 goto out;
 533         for (i = 1; i <= sclp.rnmax - assigned; i++)
 534                 insert_increment(0, 1, 0);
 535         rc = register_memory_notifier(&sclp_mem_nb);
 536         if (rc)
 537                 goto out;
 538         rc = platform_driver_register(&sclp_mem_pdrv);
 539         if (rc)
 540                 goto out;
 541         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 542         rc = PTR_ERR_OR_ZERO(sclp_pdev);
 543         if (rc)
 544                 goto out_driver;
 545         sclp_add_standby_memory();
 546         goto out;
 547 out_driver:
 548         platform_driver_unregister(&sclp_mem_pdrv);
 549 out:
 550         free_page((unsigned long) sccb);
 551         return rc;
 552 }
 553 __initcall(sclp_detect_standby_memory);
 554
 555 #endif /* CONFIG_MEMORY_HOTPLUG */
 556
 557 /*
 558  * Channel path configuration related functions.
 559  */
 560
 561 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 562 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 563 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 564
 565 struct chp_cfg_sccb {
 566         struct sccb_header header;
 567         u8 ccm;
 568         u8 reserved[6];
 569         u8 cssid;
 570 } __attribute__((packed));
 571
 572 static int do_chp_configure(sclp_cmdw_t cmd)
 573 {
 574         struct chp_cfg_sccb *sccb;
 575         int rc;
 576
 577         if (!SCLP_HAS_CHP_RECONFIG)
 578                 return -EOPNOTSUPP;
 579         /* Prepare sccb. */
 580         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 581         if (!sccb)
 582                 return -ENOMEM;
 583         sccb->header.length = sizeof(*sccb);
 584         rc = sclp_sync_request(cmd, sccb);
 585         if (rc)
 586                 goto out;
 587         switch (sccb->header.response_code) {
 588         case 0x0020:
 589         case 0x0120:
 590         case 0x0440:
 591         case 0x0450:
 592                 break;
 593         default:
 594                 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
 595                         cmd, sccb->header.response_code);
 596                 rc = -EIO;
 597                 break;
 598         }
 599 out:
 600         free_page((unsigned long) sccb);
 601         return rc;
 602 }
 603
 604 /**
 605  * sclp_chp_configure - perform configure channel-path sclp command
 606  * @chpid: channel-path ID
 607  *
 608  * Perform configure channel-path command sclp command for specified chpid.
 609  * Return 0 after command successfully finished, non-zero otherwise.
 610  */
 611 int sclp_chp_configure(struct chp_id chpid)
 612 {
 613         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 614 }
 615
 616 /**
 617  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 618  * @chpid: channel-path ID
 619  *
 620  * Perform deconfigure channel-path command sclp command for specified chpid
 621  * and wait for completion. On success return 0. Return non-zero otherwise.
 622  */
 623 int sclp_chp_deconfigure(struct chp_id chpid)
 624 {
 625         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 626 }
 627
 628 struct chp_info_sccb {
 629         struct sccb_header header;
 630         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 631         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 632         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 633         u8 ccm;
 634         u8 reserved[6];
 635         u8 cssid;
 636 } __attribute__((packed));
 637
 638 /**
 639  * sclp_chp_read_info - perform read channel-path information sclp command
 640  * @info: resulting channel-path information data
 641  *
 642  * Perform read channel-path information sclp command and wait for completion.
 643  * On success, store channel-path information in @info and return 0. Return
 644  * non-zero otherwise.
 645  */
 646 int sclp_chp_read_info(struct sclp_chp_info *info)
 647 {
 648         struct chp_info_sccb *sccb;
 649         int rc;
 650
 651         if (!SCLP_HAS_CHP_INFO)
 652                 return -EOPNOTSUPP;
 653         /* Prepare sccb. */
 654         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 655         if (!sccb)
 656                 return -ENOMEM;
 657         sccb->header.length = sizeof(*sccb);
 658         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 659         if (rc)
 660                 goto out;
 661         if (sccb->header.response_code != 0x0010) {
 662                 pr_warn("read channel-path info failed (response=0x%04x)\n",
 663                         sccb->header.response_code);
 664                 rc = -EIO;
 665                 goto out;
 666         }
 667         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 668         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 669         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 670 out:
 671         free_page((unsigned long) sccb);
 672         return rc;
 673 }