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 31 #include "sclp.h" 32 33 static void sclp_sync_callback(struct sclp_req *req, void *data) 34 { 35 struct completion *completion = data; 36 37 complete(completion); 38 } 39 40 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) 41 { 42 return sclp_sync_request_timeout(cmd, sccb, 0); 43 } 44 45 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout) 46 { 47 struct completion completion; 48 struct sclp_req *request; 49 int rc; 50 51 request = kzalloc(sizeof(*request), GFP_KERNEL); 52 if (!request) 53 return -ENOMEM; 54 if (timeout) 55 request->queue_timeout = timeout; 56 request->command = cmd; 57 request->sccb = sccb; 58 request->status = SCLP_REQ_FILLED; 59 request->callback = sclp_sync_callback; 60 request->callback_data = &completion; 61 init_completion(&completion); 62 63 /* Perform sclp request. */ 64 rc = sclp_add_request(request); 65 if (rc) 66 goto out; 67 wait_for_completion(&completion); 68 69 /* Check response. */ 70 if (request->status != SCLP_REQ_DONE) { 71 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n", 72 cmd, request->status); 73 rc = -EIO; 74 } 75 out: 76 kfree(request); 77 return rc; 78 } 79 80 /* 81 * CPU configuration related functions. 82 */ 83 84 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 85 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 86 87 int _sclp_get_core_info(struct sclp_core_info *info) 88 { 89 int rc; 90 struct read_cpu_info_sccb *sccb; 91 92 if (!SCLP_HAS_CPU_INFO) 93 return -EOPNOTSUPP; 94 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 95 if (!sccb) 96 return -ENOMEM; 97 sccb->header.length = sizeof(*sccb); 98 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb, 99 SCLP_QUEUE_INTERVAL); 100 if (rc) 101 goto out; 102 if (sccb->header.response_code != 0x0010) { 103 pr_warn("readcpuinfo failed (response=0x%04x)\n", 104 sccb->header.response_code); 105 rc = -EIO; 106 goto out; 107 } 108 sclp_fill_core_info(info, sccb); 109 out: 110 free_page((unsigned long) sccb); 111 return rc; 112 } 113 114 struct cpu_configure_sccb { 115 struct sccb_header header; 116 } __attribute__((packed, aligned(8))); 117 118 static int do_core_configure(sclp_cmdw_t cmd) 119 { 120 struct cpu_configure_sccb *sccb; 121 int rc; 122 123 if (!SCLP_HAS_CPU_RECONFIG) 124 return -EOPNOTSUPP; 125 /* 126 * This is not going to cross a page boundary since we force 127 * kmalloc to have a minimum alignment of 8 bytes on s390. 128 */ 129 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 130 if (!sccb) 131 return -ENOMEM; 132 sccb->header.length = sizeof(*sccb); 133 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); 134 if (rc) 135 goto out; 136 switch (sccb->header.response_code) { 137 case 0x0020: 138 case 0x0120: 139 break; 140 default: 141 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n", 142 cmd, sccb->header.response_code); 143 rc = -EIO; 144 break; 145 } 146 out: 147 kfree(sccb); 148 return rc; 149 } 150 151 int sclp_core_configure(u8 core) 152 { 153 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8); 154 } 155 156 int sclp_core_deconfigure(u8 core) 157 { 158 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8); 159 } 160 161 #ifdef CONFIG_MEMORY_HOTPLUG 162 163 static DEFINE_MUTEX(sclp_mem_mutex); 164 static LIST_HEAD(sclp_mem_list); 165 static u8 sclp_max_storage_id; 166 static DECLARE_BITMAP(sclp_storage_ids, 256); 167 static int sclp_mem_state_changed; 168 169 struct memory_increment { 170 struct list_head list; 171 u16 rn; 172 int standby; 173 }; 174 175 struct assign_storage_sccb { 176 struct sccb_header header; 177 u16 rn; 178 } __packed; 179 180 int arch_get_memory_phys_device(unsigned long start_pfn) 181 { 182 if (!sclp.rzm) 183 return 0; 184 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm); 185 } 186 187 static unsigned long long rn2addr(u16 rn) 188 { 189 return (unsigned long long) (rn - 1) * sclp.rzm; 190 } 191 192 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 193 { 194 struct assign_storage_sccb *sccb; 195 int rc; 196 197 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 198 if (!sccb) 199 return -ENOMEM; 200 sccb->header.length = PAGE_SIZE; 201 sccb->rn = rn; 202 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); 203 if (rc) 204 goto out; 205 switch (sccb->header.response_code) { 206 case 0x0020: 207 case 0x0120: 208 break; 209 default: 210 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n", 211 cmd, sccb->header.response_code, rn); 212 rc = -EIO; 213 break; 214 } 215 out: 216 free_page((unsigned long) sccb); 217 return rc; 218 } 219 220 static int sclp_assign_storage(u16 rn) 221 { 222 unsigned long long start; 223 int rc; 224 225 rc = do_assign_storage(0x000d0001, rn); 226 if (rc) 227 return rc; 228 start = rn2addr(rn); 229 storage_key_init_range(start, start + sclp.rzm); 230 return 0; 231 } 232 233 static int sclp_unassign_storage(u16 rn) 234 { 235 return do_assign_storage(0x000c0001, rn); 236 } 237 238 struct attach_storage_sccb { 239 struct sccb_header header; 240 u16 :16; 241 u16 assigned; 242 u32 :32; 243 u32 entries[0]; 244 } __packed; 245 246 static int sclp_attach_storage(u8 id) 247 { 248 struct attach_storage_sccb *sccb; 249 int rc; 250 int i; 251 252 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 253 if (!sccb) 254 return -ENOMEM; 255 sccb->header.length = PAGE_SIZE; 256 sccb->header.function_code = 0x40; 257 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb, 258 SCLP_QUEUE_INTERVAL); 259 if (rc) 260 goto out; 261 switch (sccb->header.response_code) { 262 case 0x0020: 263 set_bit(id, sclp_storage_ids); 264 for (i = 0; i < sccb->assigned; i++) { 265 if (sccb->entries[i]) 266 sclp_unassign_storage(sccb->entries[i] >> 16); 267 } 268 break; 269 default: 270 rc = -EIO; 271 break; 272 } 273 out: 274 free_page((unsigned long) sccb); 275 return rc; 276 } 277 278 static int sclp_mem_change_state(unsigned long start, unsigned long size, 279 int online) 280 { 281 struct memory_increment *incr; 282 unsigned long long istart; 283 int rc = 0; 284 285 list_for_each_entry(incr, &sclp_mem_list, list) { 286 istart = rn2addr(incr->rn); 287 if (start + size - 1 < istart) 288 break; 289 if (start > istart + sclp.rzm - 1) 290 continue; 291 if (online) 292 rc |= sclp_assign_storage(incr->rn); 293 else 294 sclp_unassign_storage(incr->rn); 295 if (rc == 0) 296 incr->standby = online ? 0 : 1; 297 } 298 return rc ? -EIO : 0; 299 } 300 301 static bool contains_standby_increment(unsigned long start, unsigned long end) 302 { 303 struct memory_increment *incr; 304 unsigned long istart; 305 306 list_for_each_entry(incr, &sclp_mem_list, list) { 307 istart = rn2addr(incr->rn); 308 if (end - 1 < istart) 309 continue; 310 if (start > istart + sclp.rzm - 1) 311 continue; 312 if (incr->standby) 313 return true; 314 } 315 return false; 316 } 317 318 static int sclp_mem_notifier(struct notifier_block *nb, 319 unsigned long action, void *data) 320 { 321 unsigned long start, size; 322 struct memory_notify *arg; 323 unsigned char id; 324 int rc = 0; 325 326 arg = data; 327 start = arg->start_pfn << PAGE_SHIFT; 328 size = arg->nr_pages << PAGE_SHIFT; 329 mutex_lock(&sclp_mem_mutex); 330 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 331 sclp_attach_storage(id); 332 switch (action) { 333 case MEM_GOING_OFFLINE: 334 /* 335 * We do not allow to set memory blocks offline that contain 336 * standby memory. This is done to simplify the "memory online" 337 * case. 338 */ 339 if (contains_standby_increment(start, start + size)) 340 rc = -EPERM; 341 break; 342 case MEM_ONLINE: 343 case MEM_CANCEL_OFFLINE: 344 break; 345 case MEM_GOING_ONLINE: 346 rc = sclp_mem_change_state(start, size, 1); 347 break; 348 case MEM_CANCEL_ONLINE: 349 sclp_mem_change_state(start, size, 0); 350 break; 351 case MEM_OFFLINE: 352 sclp_mem_change_state(start, size, 0); 353 break; 354 default: 355 rc = -EINVAL; 356 break; 357 } 358 if (!rc) 359 sclp_mem_state_changed = 1; 360 mutex_unlock(&sclp_mem_mutex); 361 return rc ? NOTIFY_BAD : NOTIFY_OK; 362 } 363 364 static struct notifier_block sclp_mem_nb = { 365 .notifier_call = sclp_mem_notifier, 366 }; 367 368 static void __init align_to_block_size(unsigned long long *start, 369 unsigned long long *size, 370 unsigned long long alignment) 371 { 372 unsigned long long start_align, size_align; 373 374 start_align = roundup(*start, alignment); 375 size_align = rounddown(*start + *size, alignment) - start_align; 376 377 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n", 378 *start, size_align >> 20, *size >> 20); 379 *start = start_align; 380 *size = size_align; 381 } 382 383 static void __init add_memory_merged(u16 rn) 384 { 385 unsigned long long start, size, addr, block_size; 386 static u16 first_rn, num; 387 388 if (rn && first_rn && (first_rn + num == rn)) { 389 num++; 390 return; 391 } 392 if (!first_rn) 393 goto skip_add; 394 start = rn2addr(first_rn); 395 size = (unsigned long long) num * sclp.rzm; 396 if (start >= VMEM_MAX_PHYS) 397 goto skip_add; 398 if (start + size > VMEM_MAX_PHYS) 399 size = VMEM_MAX_PHYS - start; 400 if (memory_end_set && (start >= memory_end)) 401 goto skip_add; 402 if (memory_end_set && (start + size > memory_end)) 403 size = memory_end - start; 404 block_size = memory_block_size_bytes(); 405 align_to_block_size(&start, &size, block_size); 406 if (!size) 407 goto skip_add; 408 for (addr = start; addr < start + size; addr += block_size) 409 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size); 410 skip_add: 411 first_rn = rn; 412 num = 1; 413 } 414 415 static void __init sclp_add_standby_memory(void) 416 { 417 struct memory_increment *incr; 418 419 list_for_each_entry(incr, &sclp_mem_list, list) 420 if (incr->standby) 421 add_memory_merged(incr->rn); 422 add_memory_merged(0); 423 } 424 425 static void __init insert_increment(u16 rn, int standby, int assigned) 426 { 427 struct memory_increment *incr, *new_incr; 428 struct list_head *prev; 429 u16 last_rn; 430 431 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 432 if (!new_incr) 433 return; 434 new_incr->rn = rn; 435 new_incr->standby = standby; 436 last_rn = 0; 437 prev = &sclp_mem_list; 438 list_for_each_entry(incr, &sclp_mem_list, list) { 439 if (assigned && incr->rn > rn) 440 break; 441 if (!assigned && incr->rn - last_rn > 1) 442 break; 443 last_rn = incr->rn; 444 prev = &incr->list; 445 } 446 if (!assigned) 447 new_incr->rn = last_rn + 1; 448 if (new_incr->rn > sclp.rnmax) { 449 kfree(new_incr); 450 return; 451 } 452 list_add(&new_incr->list, prev); 453 } 454 455 static int sclp_mem_freeze(struct device *dev) 456 { 457 if (!sclp_mem_state_changed) 458 return 0; 459 pr_err("Memory hotplug state changed, suspend refused.\n"); 460 return -EPERM; 461 } 462 463 static const struct dev_pm_ops sclp_mem_pm_ops = { 464 .freeze = sclp_mem_freeze, 465 }; 466 467 static struct platform_driver sclp_mem_pdrv = { 468 .driver = { 469 .name = "sclp_mem", 470 .pm = &sclp_mem_pm_ops, 471 }, 472 }; 473 474 static int __init sclp_detect_standby_memory(void) 475 { 476 struct platform_device *sclp_pdev; 477 struct read_storage_sccb *sccb; 478 int i, id, assigned, rc; 479 480 if (OLDMEM_BASE) /* 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 rc = platform_driver_register(&sclp_mem_pdrv); 530 if (rc) 531 goto out; 532 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 533 rc = PTR_ERR_OR_ZERO(sclp_pdev); 534 if (rc) 535 goto out_driver; 536 sclp_add_standby_memory(); 537 goto out; 538 out_driver: 539 platform_driver_unregister(&sclp_mem_pdrv); 540 out: 541 free_page((unsigned long) sccb); 542 return rc; 543 } 544 __initcall(sclp_detect_standby_memory); 545 546 #endif /* CONFIG_MEMORY_HOTPLUG */ 547 548 /* 549 * Channel path configuration related functions. 550 */ 551 552 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 553 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 554 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 555 556 struct chp_cfg_sccb { 557 struct sccb_header header; 558 u8 ccm; 559 u8 reserved[6]; 560 u8 cssid; 561 } __attribute__((packed)); 562 563 static int do_chp_configure(sclp_cmdw_t cmd) 564 { 565 struct chp_cfg_sccb *sccb; 566 int rc; 567 568 if (!SCLP_HAS_CHP_RECONFIG) 569 return -EOPNOTSUPP; 570 /* Prepare sccb. */ 571 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 572 if (!sccb) 573 return -ENOMEM; 574 sccb->header.length = sizeof(*sccb); 575 rc = sclp_sync_request(cmd, sccb); 576 if (rc) 577 goto out; 578 switch (sccb->header.response_code) { 579 case 0x0020: 580 case 0x0120: 581 case 0x0440: 582 case 0x0450: 583 break; 584 default: 585 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n", 586 cmd, sccb->header.response_code); 587 rc = -EIO; 588 break; 589 } 590 out: 591 free_page((unsigned long) sccb); 592 return rc; 593 } 594 595 /** 596 * sclp_chp_configure - perform configure channel-path sclp command 597 * @chpid: channel-path ID 598 * 599 * Perform configure channel-path command sclp command for specified chpid. 600 * Return 0 after command successfully finished, non-zero otherwise. 601 */ 602 int sclp_chp_configure(struct chp_id chpid) 603 { 604 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 605 } 606 607 /** 608 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 609 * @chpid: channel-path ID 610 * 611 * Perform deconfigure channel-path command sclp command for specified chpid 612 * and wait for completion. On success return 0. Return non-zero otherwise. 613 */ 614 int sclp_chp_deconfigure(struct chp_id chpid) 615 { 616 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 617 } 618 619 struct chp_info_sccb { 620 struct sccb_header header; 621 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 622 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 623 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 624 u8 ccm; 625 u8 reserved[6]; 626 u8 cssid; 627 } __attribute__((packed)); 628 629 /** 630 * sclp_chp_read_info - perform read channel-path information sclp command 631 * @info: resulting channel-path information data 632 * 633 * Perform read channel-path information sclp command and wait for completion. 634 * On success, store channel-path information in @info and return 0. Return 635 * non-zero otherwise. 636 */ 637 int sclp_chp_read_info(struct sclp_chp_info *info) 638 { 639 struct chp_info_sccb *sccb; 640 int rc; 641 642 if (!SCLP_HAS_CHP_INFO) 643 return -EOPNOTSUPP; 644 /* Prepare sccb. */ 645 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 646 if (!sccb) 647 return -ENOMEM; 648 sccb->header.length = sizeof(*sccb); 649 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 650 if (rc) 651 goto out; 652 if (sccb->header.response_code != 0x0010) { 653 pr_warn("read channel-path info failed (response=0x%04x)\n", 654 sccb->header.response_code); 655 rc = -EIO; 656 goto out; 657 } 658 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 659 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 660 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 661 out: 662 free_page((unsigned long) sccb); 663 return rc; 664 } 665