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 } 655