1/* 2 * Copyright IBM Corp. 2007, 2009 3 * 4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, 5 * 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/slab.h> 16#include <linux/string.h> 17#include <linux/mm.h> 18#include <linux/mmzone.h> 19#include <linux/memory.h> 20#include <linux/platform_device.h> 21#include <asm/chpid.h> 22#include <asm/sclp.h> 23#include <asm/setup.h> 24 25#include "sclp.h" 26 27#define SCLP_CMDW_READ_SCP_INFO 0x00020001 28#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 29 30struct read_info_sccb { 31 struct sccb_header header; /* 0-7 */ 32 u16 rnmax; /* 8-9 */ 33 u8 rnsize; /* 10 */ 34 u8 _reserved0[24 - 11]; /* 11-15 */ 35 u8 loadparm[8]; /* 24-31 */ 36 u8 _reserved1[48 - 32]; /* 32-47 */ 37 u64 facilities; /* 48-55 */ 38 u8 _reserved2[84 - 56]; /* 56-83 */ 39 u8 fac84; /* 84 */ 40 u8 _reserved3[91 - 85]; /* 85-90 */ 41 u8 flags; /* 91 */ 42 u8 _reserved4[100 - 92]; /* 92-99 */ 43 u32 rnsize2; /* 100-103 */ 44 u64 rnmax2; /* 104-111 */ 45 u8 _reserved5[4096 - 112]; /* 112-4095 */ 46} __attribute__((packed, aligned(PAGE_SIZE))); 47 48static struct read_info_sccb __initdata early_read_info_sccb; 49static int __initdata early_read_info_sccb_valid; 50 51u64 sclp_facilities; 52static u8 sclp_fac84; 53static unsigned long long rzm; 54static unsigned long long rnmax; 55 56static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 57{ 58 int rc; 59 60 __ctl_set_bit(0, 9); 61 rc = sclp_service_call(cmd, sccb); 62 if (rc) 63 goto out; 64 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT | 65 PSW_MASK_WAIT | PSW_DEFAULT_KEY); 66 local_irq_disable(); 67out: 68 /* Contents of the sccb might have changed. */ 69 barrier(); 70 __ctl_clear_bit(0, 9); 71 return rc; 72} 73 74static void __init sclp_read_info_early(void) 75{ 76 int rc; 77 int i; 78 struct read_info_sccb *sccb; 79 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 80 SCLP_CMDW_READ_SCP_INFO}; 81 82 sccb = &early_read_info_sccb; 83 for (i = 0; i < ARRAY_SIZE(commands); i++) { 84 do { 85 memset(sccb, 0, sizeof(*sccb)); 86 sccb->header.length = sizeof(*sccb); 87 sccb->header.function_code = 0x80; 88 sccb->header.control_mask[2] = 0x80; 89 rc = sclp_cmd_sync_early(commands[i], sccb); 90 } while (rc == -EBUSY); 91 92 if (rc) 93 break; 94 if (sccb->header.response_code == 0x10) { 95 early_read_info_sccb_valid = 1; 96 break; 97 } 98 if (sccb->header.response_code != 0x1f0) 99 break; 100 } 101} 102 103void __init sclp_facilities_detect(void) 104{ 105 struct read_info_sccb *sccb; 106 107 sclp_read_info_early(); 108 if (!early_read_info_sccb_valid) 109 return; 110 111 sccb = &early_read_info_sccb; 112 sclp_facilities = sccb->facilities; 113 sclp_fac84 = sccb->fac84; 114 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 115 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 116 rzm <<= 20; 117} 118 119unsigned long long sclp_get_rnmax(void) 120{ 121 return rnmax; 122} 123 124unsigned long long sclp_get_rzm(void) 125{ 126 return rzm; 127} 128 129/* 130 * This function will be called after sclp_facilities_detect(), which gets 131 * called from early.c code. Therefore the sccb should have valid contents. 132 */ 133void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 134{ 135 struct read_info_sccb *sccb; 136 137 if (!early_read_info_sccb_valid) 138 return; 139 sccb = &early_read_info_sccb; 140 info->is_valid = 1; 141 if (sccb->flags & 0x2) 142 info->has_dump = 1; 143 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); 144} 145 146static void sclp_sync_callback(struct sclp_req *req, void *data) 147{ 148 struct completion *completion = data; 149 150 complete(completion); 151} 152 153static int do_sync_request(sclp_cmdw_t cmd, void *sccb) 154{ 155 struct completion completion; 156 struct sclp_req *request; 157 int rc; 158 159 request = kzalloc(sizeof(*request), GFP_KERNEL); 160 if (!request) 161 return -ENOMEM; 162 request->command = cmd; 163 request->sccb = sccb; 164 request->status = SCLP_REQ_FILLED; 165 request->callback = sclp_sync_callback; 166 request->callback_data = &completion; 167 init_completion(&completion); 168 169 /* Perform sclp request. */ 170 rc = sclp_add_request(request); 171 if (rc) 172 goto out; 173 wait_for_completion(&completion); 174 175 /* Check response. */ 176 if (request->status != SCLP_REQ_DONE) { 177 pr_warning("sync request failed (cmd=0x%08x, " 178 "status=0x%02x)\n", cmd, request->status); 179 rc = -EIO; 180 } 181out: 182 kfree(request); 183 return rc; 184} 185 186/* 187 * CPU configuration related functions. 188 */ 189 190#define SCLP_CMDW_READ_CPU_INFO 0x00010001 191#define SCLP_CMDW_CONFIGURE_CPU 0x00110001 192#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 193 194struct read_cpu_info_sccb { 195 struct sccb_header header; 196 u16 nr_configured; 197 u16 offset_configured; 198 u16 nr_standby; 199 u16 offset_standby; 200 u8 reserved[4096 - 16]; 201} __attribute__((packed, aligned(PAGE_SIZE))); 202 203static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 204 struct read_cpu_info_sccb *sccb) 205{ 206 char *page = (char *) sccb; 207 208 memset(info, 0, sizeof(*info)); 209 info->configured = sccb->nr_configured; 210 info->standby = sccb->nr_standby; 211 info->combined = sccb->nr_configured + sccb->nr_standby; 212 info->has_cpu_type = sclp_fac84 & 0x1; 213 memcpy(&info->cpu, page + sccb->offset_configured, 214 info->combined * sizeof(struct sclp_cpu_entry)); 215} 216 217int sclp_get_cpu_info(struct sclp_cpu_info *info) 218{ 219 int rc; 220 struct read_cpu_info_sccb *sccb; 221 222 if (!SCLP_HAS_CPU_INFO) 223 return -EOPNOTSUPP; 224 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 225 if (!sccb) 226 return -ENOMEM; 227 sccb->header.length = sizeof(*sccb); 228 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 229 if (rc) 230 goto out; 231 if (sccb->header.response_code != 0x0010) { 232 pr_warning("readcpuinfo failed (response=0x%04x)\n", 233 sccb->header.response_code); 234 rc = -EIO; 235 goto out; 236 } 237 sclp_fill_cpu_info(info, sccb); 238out: 239 free_page((unsigned long) sccb); 240 return rc; 241} 242 243struct cpu_configure_sccb { 244 struct sccb_header header; 245} __attribute__((packed, aligned(8))); 246 247static int do_cpu_configure(sclp_cmdw_t cmd) 248{ 249 struct cpu_configure_sccb *sccb; 250 int rc; 251 252 if (!SCLP_HAS_CPU_RECONFIG) 253 return -EOPNOTSUPP; 254 /* 255 * This is not going to cross a page boundary since we force 256 * kmalloc to have a minimum alignment of 8 bytes on s390. 257 */ 258 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 259 if (!sccb) 260 return -ENOMEM; 261 sccb->header.length = sizeof(*sccb); 262 rc = do_sync_request(cmd, sccb); 263 if (rc) 264 goto out; 265 switch (sccb->header.response_code) { 266 case 0x0020: 267 case 0x0120: 268 break; 269 default: 270 pr_warning("configure cpu failed (cmd=0x%08x, " 271 "response=0x%04x)\n", cmd, 272 sccb->header.response_code); 273 rc = -EIO; 274 break; 275 } 276out: 277 kfree(sccb); 278 return rc; 279} 280 281int sclp_cpu_configure(u8 cpu) 282{ 283 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 284} 285 286int sclp_cpu_deconfigure(u8 cpu) 287{ 288 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 289} 290 291#ifdef CONFIG_MEMORY_HOTPLUG 292 293static DEFINE_MUTEX(sclp_mem_mutex); 294static LIST_HEAD(sclp_mem_list); 295static u8 sclp_max_storage_id; 296static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 297static int sclp_mem_state_changed; 298 299struct memory_increment { 300 struct list_head list; 301 u16 rn; 302 int standby; 303 int usecount; 304}; 305 306struct assign_storage_sccb { 307 struct sccb_header header; 308 u16 rn; 309} __packed; 310 311int arch_get_memory_phys_device(unsigned long start_pfn) 312{ 313 if (!rzm) 314 return 0; 315 return PFN_PHYS(start_pfn) >> ilog2(rzm); 316} 317 318static unsigned long long rn2addr(u16 rn) 319{ 320 return (unsigned long long) (rn - 1) * rzm; 321} 322 323static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 324{ 325 struct assign_storage_sccb *sccb; 326 int rc; 327 328 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 329 if (!sccb) 330 return -ENOMEM; 331 sccb->header.length = PAGE_SIZE; 332 sccb->rn = rn; 333 rc = do_sync_request(cmd, sccb); 334 if (rc) 335 goto out; 336 switch (sccb->header.response_code) { 337 case 0x0020: 338 case 0x0120: 339 break; 340 default: 341 pr_warning("assign storage failed (cmd=0x%08x, " 342 "response=0x%04x, rn=0x%04x)\n", cmd, 343 sccb->header.response_code, rn); 344 rc = -EIO; 345 break; 346 } 347out: 348 free_page((unsigned long) sccb); 349 return rc; 350} 351 352static int sclp_assign_storage(u16 rn) 353{ 354 return do_assign_storage(0x000d0001, rn); 355} 356 357static int sclp_unassign_storage(u16 rn) 358{ 359 return do_assign_storage(0x000c0001, rn); 360} 361 362struct attach_storage_sccb { 363 struct sccb_header header; 364 u16 :16; 365 u16 assigned; 366 u32 :32; 367 u32 entries[0]; 368} __packed; 369 370static int sclp_attach_storage(u8 id) 371{ 372 struct attach_storage_sccb *sccb; 373 int rc; 374 int i; 375 376 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 377 if (!sccb) 378 return -ENOMEM; 379 sccb->header.length = PAGE_SIZE; 380 rc = do_sync_request(0x00080001 | id << 8, sccb); 381 if (rc) 382 goto out; 383 switch (sccb->header.response_code) { 384 case 0x0020: 385 set_bit(id, sclp_storage_ids); 386 for (i = 0; i < sccb->assigned; i++) 387 sclp_unassign_storage(sccb->entries[i] >> 16); 388 break; 389 default: 390 rc = -EIO; 391 break; 392 } 393out: 394 free_page((unsigned long) sccb); 395 return rc; 396} 397 398static int sclp_mem_change_state(unsigned long start, unsigned long size, 399 int online) 400{ 401 struct memory_increment *incr; 402 unsigned long long istart; 403 int rc = 0; 404 405 list_for_each_entry(incr, &sclp_mem_list, list) { 406 istart = rn2addr(incr->rn); 407 if (start + size - 1 < istart) 408 break; 409 if (start > istart + rzm - 1) 410 continue; 411 if (online) { 412 if (incr->usecount++) 413 continue; 414 /* 415 * Don't break the loop if one assign fails. Loop may 416 * be walked again on CANCEL and we can't save 417 * information if state changed before or not. 418 * So continue and increase usecount for all increments. 419 */ 420 rc |= sclp_assign_storage(incr->rn); 421 } else { 422 if (--incr->usecount) 423 continue; 424 sclp_unassign_storage(incr->rn); 425 } 426 } 427 return rc ? -EIO : 0; 428} 429 430static int sclp_mem_notifier(struct notifier_block *nb, 431 unsigned long action, void *data) 432{ 433 unsigned long start, size; 434 struct memory_notify *arg; 435 unsigned char id; 436 int rc = 0; 437 438 arg = data; 439 start = arg->start_pfn << PAGE_SHIFT; 440 size = arg->nr_pages << PAGE_SHIFT; 441 mutex_lock(&sclp_mem_mutex); 442 for (id = 0; id <= sclp_max_storage_id; id++) 443 if (!test_bit(id, sclp_storage_ids)) 444 sclp_attach_storage(id); 445 switch (action) { 446 case MEM_ONLINE: 447 case MEM_GOING_OFFLINE: 448 case MEM_CANCEL_OFFLINE: 449 break; 450 case MEM_GOING_ONLINE: 451 rc = sclp_mem_change_state(start, size, 1); 452 break; 453 case MEM_CANCEL_ONLINE: 454 sclp_mem_change_state(start, size, 0); 455 break; 456 case MEM_OFFLINE: 457 sclp_mem_change_state(start, size, 0); 458 break; 459 default: 460 rc = -EINVAL; 461 break; 462 } 463 if (!rc) 464 sclp_mem_state_changed = 1; 465 mutex_unlock(&sclp_mem_mutex); 466 return rc ? NOTIFY_BAD : NOTIFY_OK; 467} 468 469static struct notifier_block sclp_mem_nb = { 470 .notifier_call = sclp_mem_notifier, 471}; 472 473static void __init add_memory_merged(u16 rn) 474{ 475 static u16 first_rn, num; 476 unsigned long long start, size; 477 478 if (rn && first_rn && (first_rn + num == rn)) { 479 num++; 480 return; 481 } 482 if (!first_rn) 483 goto skip_add; 484 start = rn2addr(first_rn); 485 size = (unsigned long long ) num * rzm; 486 if (start >= VMEM_MAX_PHYS) 487 goto skip_add; 488 if (start + size > VMEM_MAX_PHYS) 489 size = VMEM_MAX_PHYS - start; 490 if (memory_end_set && (start >= memory_end)) 491 goto skip_add; 492 if (memory_end_set && (start + size > memory_end)) 493 size = memory_end - start; 494 add_memory(0, start, size); 495skip_add: 496 first_rn = rn; 497 num = 1; 498} 499 500static void __init sclp_add_standby_memory(void) 501{ 502 struct memory_increment *incr; 503 504 list_for_each_entry(incr, &sclp_mem_list, list) 505 if (incr->standby) 506 add_memory_merged(incr->rn); 507 add_memory_merged(0); 508} 509 510static void __init insert_increment(u16 rn, int standby, int assigned) 511{ 512 struct memory_increment *incr, *new_incr; 513 struct list_head *prev; 514 u16 last_rn; 515 516 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 517 if (!new_incr) 518 return; 519 new_incr->rn = rn; 520 new_incr->standby = standby; 521 last_rn = 0; 522 prev = &sclp_mem_list; 523 list_for_each_entry(incr, &sclp_mem_list, list) { 524 if (assigned && incr->rn > rn) 525 break; 526 if (!assigned && incr->rn - last_rn > 1) 527 break; 528 last_rn = incr->rn; 529 prev = &incr->list; 530 } 531 if (!assigned) 532 new_incr->rn = last_rn + 1; 533 if (new_incr->rn > rnmax) { 534 kfree(new_incr); 535 return; 536 } 537 list_add(&new_incr->list, prev); 538} 539 540static int sclp_mem_freeze(struct device *dev) 541{ 542 if (!sclp_mem_state_changed) 543 return 0; 544 pr_err("Memory hotplug state changed, suspend refused.\n"); 545 return -EPERM; 546} 547 548struct read_storage_sccb { 549 struct sccb_header header; 550 u16 max_id; 551 u16 assigned; 552 u16 standby; 553 u16 :16; 554 u32 entries[0]; 555} __packed; 556 557static const struct dev_pm_ops sclp_mem_pm_ops = { 558 .freeze = sclp_mem_freeze, 559}; 560 561static struct platform_driver sclp_mem_pdrv = { 562 .driver = { 563 .name = "sclp_mem", 564 .pm = &sclp_mem_pm_ops, 565 }, 566}; 567 568static int __init sclp_detect_standby_memory(void) 569{ 570 struct platform_device *sclp_pdev; 571 struct read_storage_sccb *sccb; 572 int i, id, assigned, rc; 573 574 if (!early_read_info_sccb_valid) 575 return 0; 576 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 577 return 0; 578 rc = -ENOMEM; 579 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 580 if (!sccb) 581 goto out; 582 assigned = 0; 583 for (id = 0; id <= sclp_max_storage_id; id++) { 584 memset(sccb, 0, PAGE_SIZE); 585 sccb->header.length = PAGE_SIZE; 586 rc = do_sync_request(0x00040001 | id << 8, sccb); 587 if (rc) 588 goto out; 589 switch (sccb->header.response_code) { 590 case 0x0010: 591 set_bit(id, sclp_storage_ids); 592 for (i = 0; i < sccb->assigned; i++) { 593 if (!sccb->entries[i]) 594 continue; 595 assigned++; 596 insert_increment(sccb->entries[i] >> 16, 0, 1); 597 } 598 break; 599 case 0x0310: 600 break; 601 case 0x0410: 602 for (i = 0; i < sccb->assigned; i++) { 603 if (!sccb->entries[i]) 604 continue; 605 assigned++; 606 insert_increment(sccb->entries[i] >> 16, 1, 1); 607 } 608 break; 609 default: 610 rc = -EIO; 611 break; 612 } 613 if (!rc) 614 sclp_max_storage_id = sccb->max_id; 615 } 616 if (rc || list_empty(&sclp_mem_list)) 617 goto out; 618 for (i = 1; i <= rnmax - assigned; i++) 619 insert_increment(0, 1, 0); 620 rc = register_memory_notifier(&sclp_mem_nb); 621 if (rc) 622 goto out; 623 rc = platform_driver_register(&sclp_mem_pdrv); 624 if (rc) 625 goto out; 626 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 627 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; 628 if (rc) 629 goto out_driver; 630 sclp_add_standby_memory(); 631 goto out; 632out_driver: 633 platform_driver_unregister(&sclp_mem_pdrv); 634out: 635 free_page((unsigned long) sccb); 636 return rc; 637} 638__initcall(sclp_detect_standby_memory); 639 640#endif /* CONFIG_MEMORY_HOTPLUG */ 641 642/* 643 * Channel path configuration related functions. 644 */ 645 646#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 647#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 648#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 649 650struct chp_cfg_sccb { 651 struct sccb_header header; 652 u8 ccm; 653 u8 reserved[6]; 654 u8 cssid; 655} __attribute__((packed)); 656 657static int do_chp_configure(sclp_cmdw_t cmd) 658{ 659 struct chp_cfg_sccb *sccb; 660 int rc; 661 662 if (!SCLP_HAS_CHP_RECONFIG) 663 return -EOPNOTSUPP; 664 /* Prepare sccb. */ 665 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 666 if (!sccb) 667 return -ENOMEM; 668 sccb->header.length = sizeof(*sccb); 669 rc = do_sync_request(cmd, sccb); 670 if (rc) 671 goto out; 672 switch (sccb->header.response_code) { 673 case 0x0020: 674 case 0x0120: 675 case 0x0440: 676 case 0x0450: 677 break; 678 default: 679 pr_warning("configure channel-path failed " 680 "(cmd=0x%08x, response=0x%04x)\n", cmd, 681 sccb->header.response_code); 682 rc = -EIO; 683 break; 684 } 685out: 686 free_page((unsigned long) sccb); 687 return rc; 688} 689 690/** 691 * sclp_chp_configure - perform configure channel-path sclp command 692 * @chpid: channel-path ID 693 * 694 * Perform configure channel-path command sclp command for specified chpid. 695 * Return 0 after command successfully finished, non-zero otherwise. 696 */ 697int sclp_chp_configure(struct chp_id chpid) 698{ 699 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 700} 701 702/** 703 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 704 * @chpid: channel-path ID 705 * 706 * Perform deconfigure channel-path command sclp command for specified chpid 707 * and wait for completion. On success return 0. Return non-zero otherwise. 708 */ 709int sclp_chp_deconfigure(struct chp_id chpid) 710{ 711 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 712} 713 714struct chp_info_sccb { 715 struct sccb_header header; 716 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 717 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 718 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 719 u8 ccm; 720 u8 reserved[6]; 721 u8 cssid; 722} __attribute__((packed)); 723 724/** 725 * sclp_chp_read_info - perform read channel-path information sclp command 726 * @info: resulting channel-path information data 727 * 728 * Perform read channel-path information sclp command and wait for completion. 729 * On success, store channel-path information in @info and return 0. Return 730 * non-zero otherwise. 731 */ 732int sclp_chp_read_info(struct sclp_chp_info *info) 733{ 734 struct chp_info_sccb *sccb; 735 int rc; 736 737 if (!SCLP_HAS_CHP_INFO) 738 return -EOPNOTSUPP; 739 /* Prepare sccb. */ 740 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 741 if (!sccb) 742 return -ENOMEM; 743 sccb->header.length = sizeof(*sccb); 744 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 745 if (rc) 746 goto out; 747 if (sccb->header.response_code != 0x0010) { 748 pr_warning("read channel-path info failed " 749 "(response=0x%04x)\n", sccb->header.response_code); 750 rc = -EIO; 751 goto out; 752 } 753 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 754 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 755 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 756out: 757 free_page((unsigned long) sccb); 758 return rc; 759} 760