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/module.h> 22 #include <asm/ctl_reg.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 rc = -EINVAL; 357 break; 358 } 359 mutex_unlock(&sclp_mem_mutex); 360 return rc ? NOTIFY_BAD : NOTIFY_OK; 361 } 362 363 static struct notifier_block sclp_mem_nb = { 364 .notifier_call = sclp_mem_notifier, 365 }; 366 367 static void __init align_to_block_size(unsigned long long *start, 368 unsigned long long *size, 369 unsigned long long alignment) 370 { 371 unsigned long long start_align, size_align; 372 373 start_align = roundup(*start, alignment); 374 size_align = rounddown(*start + *size, alignment) - start_align; 375 376 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n", 377 *start, size_align >> 20, *size >> 20); 378 *start = start_align; 379 *size = size_align; 380 } 381 382 static void __init add_memory_merged(u16 rn) 383 { 384 unsigned long long start, size, addr, block_size; 385 static u16 first_rn, num; 386 387 if (rn && first_rn && (first_rn + num == rn)) { 388 num++; 389 return; 390 } 391 if (!first_rn) 392 goto skip_add; 393 start = rn2addr(first_rn); 394 size = (unsigned long long) num * sclp.rzm; 395 if (start >= ident_map_size) 396 goto skip_add; 397 if (start + size > ident_map_size) 398 size = ident_map_size - start; 399 block_size = memory_block_size_bytes(); 400 align_to_block_size(&start, &size, block_size); 401 if (!size) 402 goto skip_add; 403 for (addr = start; addr < start + size; addr += block_size) 404 add_memory(0, addr, block_size, MHP_NONE); 405 skip_add: 406 first_rn = rn; 407 num = 1; 408 } 409 410 static void __init sclp_add_standby_memory(void) 411 { 412 struct memory_increment *incr; 413 414 list_for_each_entry(incr, &sclp_mem_list, list) 415 if (incr->standby) 416 add_memory_merged(incr->rn); 417 add_memory_merged(0); 418 } 419 420 static void __init insert_increment(u16 rn, int standby, int assigned) 421 { 422 struct memory_increment *incr, *new_incr; 423 struct list_head *prev; 424 u16 last_rn; 425 426 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 427 if (!new_incr) 428 return; 429 new_incr->rn = rn; 430 new_incr->standby = standby; 431 last_rn = 0; 432 prev = &sclp_mem_list; 433 list_for_each_entry(incr, &sclp_mem_list, list) { 434 if (assigned && incr->rn > rn) 435 break; 436 if (!assigned && incr->rn - last_rn > 1) 437 break; 438 last_rn = incr->rn; 439 prev = &incr->list; 440 } 441 if (!assigned) 442 new_incr->rn = last_rn + 1; 443 if (new_incr->rn > sclp.rnmax) { 444 kfree(new_incr); 445 return; 446 } 447 list_add(&new_incr->list, prev); 448 } 449 450 static int __init sclp_detect_standby_memory(void) 451 { 452 struct read_storage_sccb *sccb; 453 int i, id, assigned, rc; 454 455 if (oldmem_data.start) /* No standby memory in kdump mode */ 456 return 0; 457 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 458 return 0; 459 rc = -ENOMEM; 460 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 461 if (!sccb) 462 goto out; 463 assigned = 0; 464 for (id = 0; id <= sclp_max_storage_id; id++) { 465 memset(sccb, 0, PAGE_SIZE); 466 sccb->header.length = PAGE_SIZE; 467 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb); 468 if (rc) 469 goto out; 470 switch (sccb->header.response_code) { 471 case 0x0010: 472 set_bit(id, sclp_storage_ids); 473 for (i = 0; i < sccb->assigned; i++) { 474 if (!sccb->entries[i]) 475 continue; 476 assigned++; 477 insert_increment(sccb->entries[i] >> 16, 0, 1); 478 } 479 break; 480 case 0x0310: 481 break; 482 case 0x0410: 483 for (i = 0; i < sccb->assigned; i++) { 484 if (!sccb->entries[i]) 485 continue; 486 assigned++; 487 insert_increment(sccb->entries[i] >> 16, 1, 1); 488 } 489 break; 490 default: 491 rc = -EIO; 492 break; 493 } 494 if (!rc) 495 sclp_max_storage_id = sccb->max_id; 496 } 497 if (rc || list_empty(&sclp_mem_list)) 498 goto out; 499 for (i = 1; i <= sclp.rnmax - assigned; i++) 500 insert_increment(0, 1, 0); 501 rc = register_memory_notifier(&sclp_mem_nb); 502 if (rc) 503 goto out; 504 sclp_add_standby_memory(); 505 out: 506 free_page((unsigned long) sccb); 507 return rc; 508 } 509 __initcall(sclp_detect_standby_memory); 510 511 #endif /* CONFIG_MEMORY_HOTPLUG */ 512 513 /* 514 * Channel path configuration related functions. 515 */ 516 517 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 518 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 519 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 520 521 struct chp_cfg_sccb { 522 struct sccb_header header; 523 u8 ccm; 524 u8 reserved[6]; 525 u8 cssid; 526 } __attribute__((packed)); 527 528 static int do_chp_configure(sclp_cmdw_t cmd) 529 { 530 struct chp_cfg_sccb *sccb; 531 int rc; 532 533 if (!SCLP_HAS_CHP_RECONFIG) 534 return -EOPNOTSUPP; 535 /* Prepare sccb. */ 536 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 537 if (!sccb) 538 return -ENOMEM; 539 sccb->header.length = sizeof(*sccb); 540 rc = sclp_sync_request(cmd, sccb); 541 if (rc) 542 goto out; 543 switch (sccb->header.response_code) { 544 case 0x0020: 545 case 0x0120: 546 case 0x0440: 547 case 0x0450: 548 break; 549 default: 550 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n", 551 cmd, sccb->header.response_code); 552 rc = -EIO; 553 break; 554 } 555 out: 556 free_page((unsigned long) sccb); 557 return rc; 558 } 559 560 /** 561 * sclp_chp_configure - perform configure channel-path sclp command 562 * @chpid: channel-path ID 563 * 564 * Perform configure channel-path command sclp command for specified chpid. 565 * Return 0 after command successfully finished, non-zero otherwise. 566 */ 567 int sclp_chp_configure(struct chp_id chpid) 568 { 569 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 570 } 571 572 /** 573 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 574 * @chpid: channel-path ID 575 * 576 * Perform deconfigure channel-path command sclp command for specified chpid 577 * and wait for completion. On success return 0. Return non-zero otherwise. 578 */ 579 int sclp_chp_deconfigure(struct chp_id chpid) 580 { 581 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 582 } 583 584 struct chp_info_sccb { 585 struct sccb_header header; 586 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 587 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 588 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 589 u8 ccm; 590 u8 reserved[6]; 591 u8 cssid; 592 } __attribute__((packed)); 593 594 /** 595 * sclp_chp_read_info - perform read channel-path information sclp command 596 * @info: resulting channel-path information data 597 * 598 * Perform read channel-path information sclp command and wait for completion. 599 * On success, store channel-path information in @info and return 0. Return 600 * non-zero otherwise. 601 */ 602 int sclp_chp_read_info(struct sclp_chp_info *info) 603 { 604 struct chp_info_sccb *sccb; 605 int rc; 606 607 if (!SCLP_HAS_CHP_INFO) 608 return -EOPNOTSUPP; 609 /* Prepare sccb. */ 610 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 611 if (!sccb) 612 return -ENOMEM; 613 sccb->header.length = sizeof(*sccb); 614 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 615 if (rc) 616 goto out; 617 if (sccb->header.response_code != 0x0010) { 618 pr_warn("read channel-path info failed (response=0x%04x)\n", 619 sccb->header.response_code); 620 rc = -EIO; 621 goto out; 622 } 623 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 624 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 625 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 626 out: 627 free_page((unsigned long) sccb); 628 return rc; 629 } 630