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 } 669