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