drivers/s390/char/sclp_cmd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2007,2012
   4  *
   5  * Author(s): 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/memory_hotplug.h>
  22 #include <linux/module.h>
  23 #include <asm/ctlreg.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 #include <asm/page-states.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
 172 struct memory_increment {
 173         struct list_head list;
 174         u16 rn;
 175         int standby;
 176 };
 177
 178 struct assign_storage_sccb {
 179         struct sccb_header header;
 180         u16 rn;
 181 } __packed;
 182
 183 int arch_get_memory_phys_device(unsigned long start_pfn)
 184 {
 185         if (!sclp.rzm)
 186                 return 0;
 187         return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
 188 }
 189
 190 static unsigned long long rn2addr(u16 rn)
 191 {
 192         return (unsigned long long) (rn - 1) * sclp.rzm;
 193 }
 194
 195 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 196 {
 197         struct assign_storage_sccb *sccb;
 198         int rc;
 199
 200         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 201         if (!sccb)
 202                 return -ENOMEM;
 203         sccb->header.length = PAGE_SIZE;
 204         sccb->rn = rn;
 205         rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
 206         if (rc)
 207                 goto out;
 208         switch (sccb->header.response_code) {
 209         case 0x0020:
 210         case 0x0120:
 211                 break;
 212         default:
 213                 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
 214                         cmd, sccb->header.response_code, rn);
 215                 rc = -EIO;
 216                 break;
 217         }
 218 out:
 219         free_page((unsigned long) sccb);
 220         return rc;
 221 }
 222
 223 static int sclp_assign_storage(u16 rn)
 224 {
 225         unsigned long long start;
 226         int rc;
 227
 228         rc = do_assign_storage(0x000d0001, rn);
 229         if (rc)
 230                 return rc;
 231         start = rn2addr(rn);
 232         storage_key_init_range(start, start + sclp.rzm);
 233         return 0;
 234 }
 235
 236 static int sclp_unassign_storage(u16 rn)
 237 {
 238         return do_assign_storage(0x000c0001, rn);
 239 }
 240
 241 struct attach_storage_sccb {
 242         struct sccb_header header;
 243         u16 :16;
 244         u16 assigned;
 245         u32 :32;
 246         u32 entries[];
 247 } __packed;
 248
 249 static int sclp_attach_storage(u8 id)
 250 {
 251         struct attach_storage_sccb *sccb;
 252         int rc;
 253         int i;
 254
 255         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 256         if (!sccb)
 257                 return -ENOMEM;
 258         sccb->header.length = PAGE_SIZE;
 259         sccb->header.function_code = 0x40;
 260         rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
 261                                        SCLP_QUEUE_INTERVAL);
 262         if (rc)
 263                 goto out;
 264         switch (sccb->header.response_code) {
 265         case 0x0020:
 266                 set_bit(id, sclp_storage_ids);
 267                 for (i = 0; i < sccb->assigned; i++) {
 268                         if (sccb->entries[i])
 269                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 270                 }
 271                 break;
 272         default:
 273                 rc = -EIO;
 274                 break;
 275         }
 276 out:
 277         free_page((unsigned long) sccb);
 278         return rc;
 279 }
 280
 281 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 282                                  int online)
 283 {
 284         struct memory_increment *incr;
 285         unsigned long long istart;
 286         int rc = 0;
 287
 288         list_for_each_entry(incr, &sclp_mem_list, list) {
 289                 istart = rn2addr(incr->rn);
 290                 if (start + size - 1 < istart)
 291                         break;
 292                 if (start > istart + sclp.rzm - 1)
 293                         continue;
 294                 if (online)
 295                         rc |= sclp_assign_storage(incr->rn);
 296                 else
 297                         sclp_unassign_storage(incr->rn);
 298                 if (rc == 0)
 299                         incr->standby = online ? 0 : 1;
 300         }
 301         return rc ? -EIO : 0;
 302 }
 303
 304 static bool contains_standby_increment(unsigned long start, unsigned long end)
 305 {
 306         struct memory_increment *incr;
 307         unsigned long istart;
 308
 309         list_for_each_entry(incr, &sclp_mem_list, list) {
 310                 istart = rn2addr(incr->rn);
 311                 if (end - 1 < istart)
 312                         continue;
 313                 if (start > istart + sclp.rzm - 1)
 314                         continue;
 315                 if (incr->standby)
 316                         return true;
 317         }
 318         return false;
 319 }
 320
 321 static int sclp_mem_notifier(struct notifier_block *nb,
 322                              unsigned long action, void *data)
 323 {
 324         unsigned long start, size;
 325         struct memory_notify *arg;
 326         unsigned char id;
 327         int rc = 0;
 328
 329         arg = data;
 330         start = arg->start_pfn << PAGE_SHIFT;
 331         size = arg->nr_pages << PAGE_SHIFT;
 332         mutex_lock(&sclp_mem_mutex);
 333         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 334                 sclp_attach_storage(id);
 335         switch (action) {
 336         case MEM_GOING_OFFLINE:
 337                 /*
 338                  * We do not allow to set memory blocks offline that contain
 339                  * standby memory. This is done to simplify the "memory online"
 340                  * case.
 341                  */
 342                 if (contains_standby_increment(start, start + size))
 343                         rc = -EPERM;
 344                 break;
 345         case MEM_PREPARE_ONLINE:
 346                 /*
 347                  * Access the altmap_start_pfn and altmap_nr_pages fields
 348                  * within the struct memory_notify specifically when dealing
 349                  * with only MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers.
 350                  *
 351                  * When altmap is in use, take the specified memory range
 352                  * online, which includes the altmap.
 353                  */
 354                 if (arg->altmap_nr_pages) {
 355                         start = PFN_PHYS(arg->altmap_start_pfn);
 356                         size += PFN_PHYS(arg->altmap_nr_pages);
 357                 }
 358                 rc = sclp_mem_change_state(start, size, 1);
 359                 if (rc || !arg->altmap_nr_pages)
 360                         break;
 361                 /*
 362                  * Set CMMA state to nodat here, since the struct page memory
 363                  * at the beginning of the memory block will not go through the
 364                  * buddy allocator later.
 365                  */
 366                 __arch_set_page_nodat((void *)__va(start), arg->altmap_nr_pages);
 367                 break;
 368         case MEM_FINISH_OFFLINE:
 369                 /*
 370                  * When altmap is in use, take the specified memory range
 371                  * offline, which includes the altmap.
 372                  */
 373                 if (arg->altmap_nr_pages) {
 374                         start = PFN_PHYS(arg->altmap_start_pfn);
 375                         size += PFN_PHYS(arg->altmap_nr_pages);
 376                 }
 377                 sclp_mem_change_state(start, size, 0);
 378                 break;
 379         default:
 380                 break;
 381         }
 382         mutex_unlock(&sclp_mem_mutex);
 383         return rc ? NOTIFY_BAD : NOTIFY_OK;
 384 }
 385
 386 static struct notifier_block sclp_mem_nb = {
 387         .notifier_call = sclp_mem_notifier,
 388 };
 389
 390 static void __init align_to_block_size(unsigned long long *start,
 391                                        unsigned long long *size,
 392                                        unsigned long long alignment)
 393 {
 394         unsigned long long start_align, size_align;
 395
 396         start_align = roundup(*start, alignment);
 397         size_align = rounddown(*start + *size, alignment) - start_align;
 398
 399         pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
 400                 *start, size_align >> 20, *size >> 20);
 401         *start = start_align;
 402         *size = size_align;
 403 }
 404
 405 static void __init add_memory_merged(u16 rn)
 406 {
 407         unsigned long long start, size, addr, block_size;
 408         static u16 first_rn, num;
 409
 410         if (rn && first_rn && (first_rn + num == rn)) {
 411                 num++;
 412                 return;
 413         }
 414         if (!first_rn)
 415                 goto skip_add;
 416         start = rn2addr(first_rn);
 417         size = (unsigned long long) num * sclp.rzm;
 418         if (start >= ident_map_size)
 419                 goto skip_add;
 420         if (start + size > ident_map_size)
 421                 size = ident_map_size - start;
 422         block_size = memory_block_size_bytes();
 423         align_to_block_size(&start, &size, block_size);
 424         if (!size)
 425                 goto skip_add;
 426         for (addr = start; addr < start + size; addr += block_size)
 427                 add_memory(0, addr, block_size,
 428                            MACHINE_HAS_EDAT1 ?
 429                            MHP_MEMMAP_ON_MEMORY | MHP_OFFLINE_INACCESSIBLE : MHP_NONE);
 430 skip_add:
 431         first_rn = rn;
 432         num = 1;
 433 }
 434
 435 static void __init sclp_add_standby_memory(void)
 436 {
 437         struct memory_increment *incr;
 438
 439         list_for_each_entry(incr, &sclp_mem_list, list)
 440                 if (incr->standby)
 441                         add_memory_merged(incr->rn);
 442         add_memory_merged(0);
 443 }
 444
 445 static void __init insert_increment(u16 rn, int standby, int assigned)
 446 {
 447         struct memory_increment *incr, *new_incr;
 448         struct list_head *prev;
 449         u16 last_rn;
 450
 451         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 452         if (!new_incr)
 453                 return;
 454         new_incr->rn = rn;
 455         new_incr->standby = standby;
 456         last_rn = 0;
 457         prev = &sclp_mem_list;
 458         list_for_each_entry(incr, &sclp_mem_list, list) {
 459                 if (assigned && incr->rn > rn)
 460                         break;
 461                 if (!assigned && incr->rn - last_rn > 1)
 462                         break;
 463                 last_rn = incr->rn;
 464                 prev = &incr->list;
 465         }
 466         if (!assigned)
 467                 new_incr->rn = last_rn + 1;
 468         if (new_incr->rn > sclp.rnmax) {
 469                 kfree(new_incr);
 470                 return;
 471         }
 472         list_add(&new_incr->list, prev);
 473 }
 474
 475 static int __init sclp_detect_standby_memory(void)
 476 {
 477         struct read_storage_sccb *sccb;
 478         int i, id, assigned, rc;
 479
 480         if (oldmem_data.start) /* No standby memory in kdump mode */
 481                 return 0;
 482         if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 483                 return 0;
 484         rc = -ENOMEM;
 485         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 486         if (!sccb)
 487                 goto out;
 488         assigned = 0;
 489         for (id = 0; id <= sclp_max_storage_id; id++) {
 490                 memset(sccb, 0, PAGE_SIZE);
 491                 sccb->header.length = PAGE_SIZE;
 492                 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
 493                 if (rc)
 494                         goto out;
 495                 switch (sccb->header.response_code) {
 496                 case 0x0010:
 497                         set_bit(id, sclp_storage_ids);
 498                         for (i = 0; i < sccb->assigned; i++) {
 499                                 if (!sccb->entries[i])
 500                                         continue;
 501                                 assigned++;
 502                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 503                         }
 504                         break;
 505                 case 0x0310:
 506                         break;
 507                 case 0x0410:
 508                         for (i = 0; i < sccb->assigned; i++) {
 509                                 if (!sccb->entries[i])
 510                                         continue;
 511                                 assigned++;
 512                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 513                         }
 514                         break;
 515                 default:
 516                         rc = -EIO;
 517                         break;
 518                 }
 519                 if (!rc)
 520                         sclp_max_storage_id = sccb->max_id;
 521         }
 522         if (rc || list_empty(&sclp_mem_list))
 523                 goto out;
 524         for (i = 1; i <= sclp.rnmax - assigned; i++)
 525                 insert_increment(0, 1, 0);
 526         rc = register_memory_notifier(&sclp_mem_nb);
 527         if (rc)
 528                 goto out;
 529         sclp_add_standby_memory();
 530 out:
 531         free_page((unsigned long) sccb);
 532         return rc;
 533 }
 534 __initcall(sclp_detect_standby_memory);
 535
 536 #endif /* CONFIG_MEMORY_HOTPLUG */
 537
 538 /*
 539  * Channel path configuration related functions.
 540  */
 541
 542 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 543 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 544 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 545
 546 struct chp_cfg_sccb {
 547         struct sccb_header header;
 548         u8 ccm;
 549         u8 reserved[6];
 550         u8 cssid;
 551 } __attribute__((packed));
 552
 553 static int do_chp_configure(sclp_cmdw_t cmd)
 554 {
 555         struct chp_cfg_sccb *sccb;
 556         int rc;
 557
 558         if (!SCLP_HAS_CHP_RECONFIG)
 559                 return -EOPNOTSUPP;
 560         /* Prepare sccb. */
 561         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 562         if (!sccb)
 563                 return -ENOMEM;
 564         sccb->header.length = sizeof(*sccb);
 565         rc = sclp_sync_request(cmd, sccb);
 566         if (rc)
 567                 goto out;
 568         switch (sccb->header.response_code) {
 569         case 0x0020:
 570         case 0x0120:
 571         case 0x0440:
 572         case 0x0450:
 573                 break;
 574         default:
 575                 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
 576                         cmd, sccb->header.response_code);
 577                 rc = -EIO;
 578                 break;
 579         }
 580 out:
 581         free_page((unsigned long) sccb);
 582         return rc;
 583 }
 584
 585 /**
 586  * sclp_chp_configure - perform configure channel-path sclp command
 587  * @chpid: channel-path ID
 588  *
 589  * Perform configure channel-path command sclp command for specified chpid.
 590  * Return 0 after command successfully finished, non-zero otherwise.
 591  */
 592 int sclp_chp_configure(struct chp_id chpid)
 593 {
 594         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 595 }
 596
 597 /**
 598  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 599  * @chpid: channel-path ID
 600  *
 601  * Perform deconfigure channel-path command sclp command for specified chpid
 602  * and wait for completion. On success return 0. Return non-zero otherwise.
 603  */
 604 int sclp_chp_deconfigure(struct chp_id chpid)
 605 {
 606         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 607 }
 608
 609 struct chp_info_sccb {
 610         struct sccb_header header;
 611         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 612         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 613         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 614         u8 ccm;
 615         u8 reserved[6];
 616         u8 cssid;
 617 } __attribute__((packed));
 618
 619 /**
 620  * sclp_chp_read_info - perform read channel-path information sclp command
 621  * @info: resulting channel-path information data
 622  *
 623  * Perform read channel-path information sclp command and wait for completion.
 624  * On success, store channel-path information in @info and return 0. Return
 625  * non-zero otherwise.
 626  */
 627 int sclp_chp_read_info(struct sclp_chp_info *info)
 628 {
 629         struct chp_info_sccb *sccb;
 630         int rc;
 631
 632         if (!SCLP_HAS_CHP_INFO)
 633                 return -EOPNOTSUPP;
 634         /* Prepare sccb. */
 635         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 636         if (!sccb)
 637                 return -ENOMEM;
 638         sccb->header.length = sizeof(*sccb);
 639         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 640         if (rc)
 641                 goto out;
 642         if (sccb->header.response_code != 0x0010) {
 643                 pr_warn("read channel-path info failed (response=0x%04x)\n",
 644                         sccb->header.response_code);
 645                 rc = -EIO;
 646                 goto out;
 647         }
 648         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 649         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 650         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 651 out:
 652         free_page((unsigned long) sccb);
 653         return rc;
 654 }