1/* 2 * zcore module to export memory content and register sets for creating system 3 * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same 4 * dump format as s390 standalone dumps. 5 * 6 * For more information please refer to Documentation/s390/zfcpdump.txt 7 * 8 * Copyright IBM Corp. 2003, 2008 9 * Author(s): Michael Holzheu 10 */ 11 12#define KMSG_COMPONENT "zdump" 13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15#include <linux/init.h> 16#include <linux/slab.h> 17#include <linux/miscdevice.h> 18#include <linux/debugfs.h> 19#include <linux/module.h> 20#include <linux/memblock.h> 21 22#include <asm/asm-offsets.h> 23#include <asm/ipl.h> 24#include <asm/sclp.h> 25#include <asm/setup.h> 26#include <asm/uaccess.h> 27#include <asm/debug.h> 28#include <asm/processor.h> 29#include <asm/irqflags.h> 30#include <asm/checksum.h> 31#include <asm/switch_to.h> 32#include "sclp.h" 33 34#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) 35 36#define TO_USER 1 37#define TO_KERNEL 0 38#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ 39 40enum arch_id { 41 ARCH_S390 = 0, 42 ARCH_S390X = 1, 43}; 44 45/* dump system info */ 46 47struct sys_info { 48 enum arch_id arch; 49 unsigned long sa_base; 50 u32 sa_size; 51 int cpu_map[NR_CPUS]; 52 unsigned long mem_size; 53 struct save_area lc_mask; 54}; 55 56struct ipib_info { 57 unsigned long ipib; 58 u32 checksum; 59} __attribute__((packed)); 60 61static struct sys_info sys_info; 62static struct debug_info *zcore_dbf; 63static int hsa_available; 64static struct dentry *zcore_dir; 65static struct dentry *zcore_file; 66static struct dentry *zcore_memmap_file; 67static struct dentry *zcore_reipl_file; 68static struct dentry *zcore_hsa_file; 69static struct ipl_parameter_block *ipl_block; 70 71/* 72 * Copy memory from HSA to kernel or user memory (not reentrant): 73 * 74 * @dest: Kernel or user buffer where memory should be copied to 75 * @src: Start address within HSA where data should be copied 76 * @count: Size of buffer, which should be copied 77 * @mode: Either TO_KERNEL or TO_USER 78 */ 79int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) 80{ 81 int offs, blk_num; 82 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 83 84 if (!hsa_available) 85 return -ENODATA; 86 if (count == 0) 87 return 0; 88 89 /* copy first block */ 90 offs = 0; 91 if ((src % PAGE_SIZE) != 0) { 92 blk_num = src / PAGE_SIZE + 2; 93 if (sclp_sdias_copy(buf, blk_num, 1)) { 94 TRACE("sclp_sdias_copy() failed\n"); 95 return -EIO; 96 } 97 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); 98 if (mode == TO_USER) { 99 if (copy_to_user((__force __user void*) dest, 100 buf + (src % PAGE_SIZE), offs)) 101 return -EFAULT; 102 } else 103 memcpy(dest, buf + (src % PAGE_SIZE), offs); 104 } 105 if (offs == count) 106 goto out; 107 108 /* copy middle */ 109 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { 110 blk_num = (src + offs) / PAGE_SIZE + 2; 111 if (sclp_sdias_copy(buf, blk_num, 1)) { 112 TRACE("sclp_sdias_copy() failed\n"); 113 return -EIO; 114 } 115 if (mode == TO_USER) { 116 if (copy_to_user((__force __user void*) dest + offs, 117 buf, PAGE_SIZE)) 118 return -EFAULT; 119 } else 120 memcpy(dest + offs, buf, PAGE_SIZE); 121 } 122 if (offs == count) 123 goto out; 124 125 /* copy last block */ 126 blk_num = (src + offs) / PAGE_SIZE + 2; 127 if (sclp_sdias_copy(buf, blk_num, 1)) { 128 TRACE("sclp_sdias_copy() failed\n"); 129 return -EIO; 130 } 131 if (mode == TO_USER) { 132 if (copy_to_user((__force __user void*) dest + offs, buf, 133 count - offs)) 134 return -EFAULT; 135 } else 136 memcpy(dest + offs, buf, count - offs); 137out: 138 return 0; 139} 140 141static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) 142{ 143 return memcpy_hsa((void __force *) dest, src, count, TO_USER); 144} 145 146static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) 147{ 148 return memcpy_hsa(dest, src, count, TO_KERNEL); 149} 150 151static int __init init_cpu_info(enum arch_id arch) 152{ 153 struct save_area_ext *sa_ext; 154 155 /* get info for boot cpu from lowcore, stored in the HSA */ 156 157 sa_ext = dump_save_area_create(0); 158 if (!sa_ext) 159 return -ENOMEM; 160 if (memcpy_hsa_kernel(&sa_ext->sa, sys_info.sa_base, 161 sys_info.sa_size) < 0) { 162 TRACE("could not copy from HSA\n"); 163 kfree(sa_ext); 164 return -EIO; 165 } 166 if (MACHINE_HAS_VX) 167 save_vx_regs_safe(sa_ext->vx_regs); 168 return 0; 169} 170 171static DEFINE_MUTEX(zcore_mutex); 172 173#define DUMP_VERSION 0x5 174#define DUMP_MAGIC 0xa8190173618f23fdULL 175#define DUMP_ARCH_S390X 2 176#define DUMP_ARCH_S390 1 177#define HEADER_SIZE 4096 178 179/* dump header dumped according to s390 crash dump format */ 180 181struct zcore_header { 182 u64 magic; 183 u32 version; 184 u32 header_size; 185 u32 dump_level; 186 u32 page_size; 187 u64 mem_size; 188 u64 mem_start; 189 u64 mem_end; 190 u32 num_pages; 191 u32 pad1; 192 u64 tod; 193 struct cpuid cpu_id; 194 u32 arch_id; 195 u32 volnr; 196 u32 build_arch; 197 u64 rmem_size; 198 u8 mvdump; 199 u16 cpu_cnt; 200 u16 real_cpu_cnt; 201 u8 end_pad1[0x200-0x061]; 202 u64 mvdump_sign; 203 u64 mvdump_zipl_time; 204 u8 end_pad2[0x800-0x210]; 205 u32 lc_vec[512]; 206} __attribute__((packed,__aligned__(16))); 207 208static struct zcore_header zcore_header = { 209 .magic = DUMP_MAGIC, 210 .version = DUMP_VERSION, 211 .header_size = 4096, 212 .dump_level = 0, 213 .page_size = PAGE_SIZE, 214 .mem_start = 0, 215#ifdef CONFIG_64BIT 216 .build_arch = DUMP_ARCH_S390X, 217#else 218 .build_arch = DUMP_ARCH_S390, 219#endif 220}; 221 222/* 223 * Copy lowcore info to buffer. Use map in order to copy only register parts. 224 * 225 * @buf: User buffer 226 * @sa: Pointer to save area 227 * @sa_off: Offset in save area to copy 228 * @len: Number of bytes to copy 229 */ 230static int copy_lc(void __user *buf, void *sa, int sa_off, int len) 231{ 232 int i; 233 char *lc_mask = (char*)&sys_info.lc_mask; 234 235 for (i = 0; i < len; i++) { 236 if (!lc_mask[i + sa_off]) 237 continue; 238 if (copy_to_user(buf + i, sa + sa_off + i, 1)) 239 return -EFAULT; 240 } 241 return 0; 242} 243 244/* 245 * Copy lowcores info to memory, if necessary 246 * 247 * @buf: User buffer 248 * @addr: Start address of buffer in dump memory 249 * @count: Size of buffer 250 */ 251static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) 252{ 253 unsigned long end; 254 int i; 255 256 if (count == 0) 257 return 0; 258 259 end = start + count; 260 for (i = 0; i < dump_save_areas.count; i++) { 261 unsigned long cp_start, cp_end; /* copy range */ 262 unsigned long sa_start, sa_end; /* save area range */ 263 unsigned long prefix; 264 unsigned long sa_off, len, buf_off; 265 struct save_area *save_area = &dump_save_areas.areas[i]->sa; 266 267 prefix = save_area->pref_reg; 268 sa_start = prefix + sys_info.sa_base; 269 sa_end = prefix + sys_info.sa_base + sys_info.sa_size; 270 271 if ((end < sa_start) || (start > sa_end)) 272 continue; 273 cp_start = max(start, sa_start); 274 cp_end = min(end, sa_end); 275 276 buf_off = cp_start - start; 277 sa_off = cp_start - sa_start; 278 len = cp_end - cp_start; 279 280 TRACE("copy_lc for: %lx\n", start); 281 if (copy_lc(buf + buf_off, save_area, sa_off, len)) 282 return -EFAULT; 283 } 284 return 0; 285} 286 287/* 288 * Release the HSA 289 */ 290static void release_hsa(void) 291{ 292 diag308(DIAG308_REL_HSA, NULL); 293 hsa_available = 0; 294} 295 296/* 297 * Read routine for zcore character device 298 * First 4K are dump header 299 * Next 32MB are HSA Memory 300 * Rest is read from absolute Memory 301 */ 302static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, 303 loff_t *ppos) 304{ 305 unsigned long mem_start; /* Start address in memory */ 306 size_t mem_offs; /* Offset in dump memory */ 307 size_t hdr_count; /* Size of header part of output buffer */ 308 size_t size; 309 int rc; 310 311 mutex_lock(&zcore_mutex); 312 313 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { 314 rc = -EINVAL; 315 goto fail; 316 } 317 318 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); 319 320 /* Copy dump header */ 321 if (*ppos < HEADER_SIZE) { 322 size = min(count, (size_t) (HEADER_SIZE - *ppos)); 323 if (copy_to_user(buf, &zcore_header + *ppos, size)) { 324 rc = -EFAULT; 325 goto fail; 326 } 327 hdr_count = size; 328 mem_start = 0; 329 } else { 330 hdr_count = 0; 331 mem_start = *ppos - HEADER_SIZE; 332 } 333 334 mem_offs = 0; 335 336 /* Copy from HSA data */ 337 if (*ppos < sclp_get_hsa_size() + HEADER_SIZE) { 338 size = min((count - hdr_count), 339 (size_t) (sclp_get_hsa_size() - mem_start)); 340 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); 341 if (rc) 342 goto fail; 343 344 mem_offs += size; 345 } 346 347 /* Copy from real mem */ 348 size = count - mem_offs - hdr_count; 349 rc = copy_to_user_real(buf + hdr_count + mem_offs, 350 (void *) mem_start + mem_offs, size); 351 if (rc) 352 goto fail; 353 354 /* 355 * Since s390 dump analysis tools like lcrash or crash 356 * expect register sets in the prefix pages of the cpus, 357 * we copy them into the read buffer, if necessary. 358 * buf + hdr_count: Start of memory part of output buffer 359 * mem_start: Start memory address to copy from 360 * count - hdr_count: Size of memory area to copy 361 */ 362 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { 363 rc = -EFAULT; 364 goto fail; 365 } 366 *ppos += count; 367fail: 368 mutex_unlock(&zcore_mutex); 369 return (rc < 0) ? rc : count; 370} 371 372static int zcore_open(struct inode *inode, struct file *filp) 373{ 374 if (!hsa_available) 375 return -ENODATA; 376 else 377 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; 378} 379 380static int zcore_release(struct inode *inode, struct file *filep) 381{ 382 if (hsa_available) 383 release_hsa(); 384 return 0; 385} 386 387static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) 388{ 389 loff_t rc; 390 391 mutex_lock(&zcore_mutex); 392 switch (orig) { 393 case 0: 394 file->f_pos = offset; 395 rc = file->f_pos; 396 break; 397 case 1: 398 file->f_pos += offset; 399 rc = file->f_pos; 400 break; 401 default: 402 rc = -EINVAL; 403 } 404 mutex_unlock(&zcore_mutex); 405 return rc; 406} 407 408static const struct file_operations zcore_fops = { 409 .owner = THIS_MODULE, 410 .llseek = zcore_lseek, 411 .read = zcore_read, 412 .open = zcore_open, 413 .release = zcore_release, 414}; 415 416static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, 417 size_t count, loff_t *ppos) 418{ 419 return simple_read_from_buffer(buf, count, ppos, filp->private_data, 420 memblock.memory.cnt * CHUNK_INFO_SIZE); 421} 422 423static int zcore_memmap_open(struct inode *inode, struct file *filp) 424{ 425 struct memblock_region *reg; 426 char *buf; 427 int i = 0; 428 429 buf = kzalloc(memblock.memory.cnt * CHUNK_INFO_SIZE, GFP_KERNEL); 430 if (!buf) { 431 return -ENOMEM; 432 } 433 for_each_memblock(memory, reg) { 434 sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ", 435 (unsigned long long) reg->base, 436 (unsigned long long) reg->size); 437 } 438 filp->private_data = buf; 439 return nonseekable_open(inode, filp); 440} 441 442static int zcore_memmap_release(struct inode *inode, struct file *filp) 443{ 444 kfree(filp->private_data); 445 return 0; 446} 447 448static const struct file_operations zcore_memmap_fops = { 449 .owner = THIS_MODULE, 450 .read = zcore_memmap_read, 451 .open = zcore_memmap_open, 452 .release = zcore_memmap_release, 453 .llseek = no_llseek, 454}; 455 456static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, 457 size_t count, loff_t *ppos) 458{ 459 if (ipl_block) { 460 diag308(DIAG308_SET, ipl_block); 461 diag308(DIAG308_IPL, NULL); 462 } 463 return count; 464} 465 466static int zcore_reipl_open(struct inode *inode, struct file *filp) 467{ 468 return nonseekable_open(inode, filp); 469} 470 471static int zcore_reipl_release(struct inode *inode, struct file *filp) 472{ 473 return 0; 474} 475 476static const struct file_operations zcore_reipl_fops = { 477 .owner = THIS_MODULE, 478 .write = zcore_reipl_write, 479 .open = zcore_reipl_open, 480 .release = zcore_reipl_release, 481 .llseek = no_llseek, 482}; 483 484static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, 485 size_t count, loff_t *ppos) 486{ 487 static char str[18]; 488 489 if (hsa_available) 490 snprintf(str, sizeof(str), "%lx\n", sclp_get_hsa_size()); 491 else 492 snprintf(str, sizeof(str), "0\n"); 493 return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); 494} 495 496static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, 497 size_t count, loff_t *ppos) 498{ 499 char value; 500 501 if (*ppos != 0) 502 return -EPIPE; 503 if (copy_from_user(&value, buf, 1)) 504 return -EFAULT; 505 if (value != '0') 506 return -EINVAL; 507 release_hsa(); 508 return count; 509} 510 511static const struct file_operations zcore_hsa_fops = { 512 .owner = THIS_MODULE, 513 .write = zcore_hsa_write, 514 .read = zcore_hsa_read, 515 .open = nonseekable_open, 516 .llseek = no_llseek, 517}; 518 519#ifdef CONFIG_32BIT 520 521static void __init set_lc_mask(struct save_area *map) 522{ 523 memset(&map->ext_save, 0xff, sizeof(map->ext_save)); 524 memset(&map->timer, 0xff, sizeof(map->timer)); 525 memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp)); 526 memset(&map->psw, 0xff, sizeof(map->psw)); 527 memset(&map->pref_reg, 0xff, sizeof(map->pref_reg)); 528 memset(&map->acc_regs, 0xff, sizeof(map->acc_regs)); 529 memset(&map->fp_regs, 0xff, sizeof(map->fp_regs)); 530 memset(&map->gp_regs, 0xff, sizeof(map->gp_regs)); 531 memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs)); 532} 533 534#else /* CONFIG_32BIT */ 535 536static void __init set_lc_mask(struct save_area *map) 537{ 538 memset(&map->fp_regs, 0xff, sizeof(map->fp_regs)); 539 memset(&map->gp_regs, 0xff, sizeof(map->gp_regs)); 540 memset(&map->psw, 0xff, sizeof(map->psw)); 541 memset(&map->pref_reg, 0xff, sizeof(map->pref_reg)); 542 memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg)); 543 memset(&map->tod_reg, 0xff, sizeof(map->tod_reg)); 544 memset(&map->timer, 0xff, sizeof(map->timer)); 545 memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp)); 546 memset(&map->acc_regs, 0xff, sizeof(map->acc_regs)); 547 memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs)); 548} 549 550#endif /* CONFIG_32BIT */ 551 552/* 553 * Initialize dump globals for a given architecture 554 */ 555static int __init sys_info_init(enum arch_id arch, unsigned long mem_end) 556{ 557 int rc; 558 559 switch (arch) { 560 case ARCH_S390X: 561 pr_alert("DETECTED 'S390X (64 bit) OS'\n"); 562 break; 563 case ARCH_S390: 564 pr_alert("DETECTED 'S390 (32 bit) OS'\n"); 565 break; 566 default: 567 pr_alert("0x%x is an unknown architecture.\n",arch); 568 return -EINVAL; 569 } 570 sys_info.sa_base = SAVE_AREA_BASE; 571 sys_info.sa_size = sizeof(struct save_area); 572 sys_info.arch = arch; 573 set_lc_mask(&sys_info.lc_mask); 574 rc = init_cpu_info(arch); 575 if (rc) 576 return rc; 577 sys_info.mem_size = mem_end; 578 579 return 0; 580} 581 582static int __init check_sdias(void) 583{ 584 if (!sclp_get_hsa_size()) { 585 TRACE("Could not determine HSA size\n"); 586 return -ENODEV; 587 } 588 return 0; 589} 590 591static int __init get_mem_info(unsigned long *mem, unsigned long *end) 592{ 593 struct memblock_region *reg; 594 595 for_each_memblock(memory, reg) { 596 *mem += reg->size; 597 *end = max_t(unsigned long, *end, reg->base + reg->size); 598 } 599 return 0; 600} 601 602static void __init zcore_header_init(int arch, struct zcore_header *hdr, 603 unsigned long mem_size) 604{ 605 u32 prefix; 606 int i; 607 608 if (arch == ARCH_S390X) 609 hdr->arch_id = DUMP_ARCH_S390X; 610 else 611 hdr->arch_id = DUMP_ARCH_S390; 612 hdr->mem_size = mem_size; 613 hdr->rmem_size = mem_size; 614 hdr->mem_end = sys_info.mem_size; 615 hdr->num_pages = mem_size / PAGE_SIZE; 616 hdr->tod = get_tod_clock(); 617 get_cpu_id(&hdr->cpu_id); 618 for (i = 0; i < dump_save_areas.count; i++) { 619 prefix = dump_save_areas.areas[i]->sa.pref_reg; 620 hdr->real_cpu_cnt++; 621 if (!prefix) 622 continue; 623 hdr->lc_vec[hdr->cpu_cnt] = prefix; 624 hdr->cpu_cnt++; 625 } 626} 627 628/* 629 * Provide IPL parameter information block from either HSA or memory 630 * for future reipl 631 */ 632static int __init zcore_reipl_init(void) 633{ 634 struct ipib_info ipib_info; 635 int rc; 636 637 rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); 638 if (rc) 639 return rc; 640 if (ipib_info.ipib == 0) 641 return 0; 642 ipl_block = (void *) __get_free_page(GFP_KERNEL); 643 if (!ipl_block) 644 return -ENOMEM; 645 if (ipib_info.ipib < sclp_get_hsa_size()) 646 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); 647 else 648 rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); 649 if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) != 650 ipib_info.checksum) { 651 TRACE("Checksum does not match\n"); 652 free_page((unsigned long) ipl_block); 653 ipl_block = NULL; 654 } 655 return 0; 656} 657 658static int __init zcore_init(void) 659{ 660 unsigned long mem_size, mem_end; 661 unsigned char arch; 662 int rc; 663 664 mem_size = mem_end = 0; 665 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 666 return -ENODATA; 667 if (OLDMEM_BASE) 668 return -ENODATA; 669 670 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); 671 debug_register_view(zcore_dbf, &debug_sprintf_view); 672 debug_set_level(zcore_dbf, 6); 673 674 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); 675 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); 676 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); 677 678 rc = sclp_sdias_init(); 679 if (rc) 680 goto fail; 681 682 rc = check_sdias(); 683 if (rc) 684 goto fail; 685 hsa_available = 1; 686 687 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); 688 if (rc) 689 goto fail; 690 691#ifdef CONFIG_64BIT 692 if (arch == ARCH_S390) { 693 pr_alert("The 64-bit dump tool cannot be used for a " 694 "32-bit system\n"); 695 rc = -EINVAL; 696 goto fail; 697 } 698#else /* CONFIG_64BIT */ 699 if (arch == ARCH_S390X) { 700 pr_alert("The 32-bit dump tool cannot be used for a " 701 "64-bit system\n"); 702 rc = -EINVAL; 703 goto fail; 704 } 705#endif /* CONFIG_64BIT */ 706 707 rc = get_mem_info(&mem_size, &mem_end); 708 if (rc) 709 goto fail; 710 711 rc = sys_info_init(arch, mem_end); 712 if (rc) 713 goto fail; 714 zcore_header_init(arch, &zcore_header, mem_size); 715 716 rc = zcore_reipl_init(); 717 if (rc) 718 goto fail; 719 720 zcore_dir = debugfs_create_dir("zcore" , NULL); 721 if (!zcore_dir) { 722 rc = -ENOMEM; 723 goto fail; 724 } 725 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, 726 &zcore_fops); 727 if (!zcore_file) { 728 rc = -ENOMEM; 729 goto fail_dir; 730 } 731 zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, 732 NULL, &zcore_memmap_fops); 733 if (!zcore_memmap_file) { 734 rc = -ENOMEM; 735 goto fail_file; 736 } 737 zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, 738 NULL, &zcore_reipl_fops); 739 if (!zcore_reipl_file) { 740 rc = -ENOMEM; 741 goto fail_memmap_file; 742 } 743 zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, 744 NULL, &zcore_hsa_fops); 745 if (!zcore_hsa_file) { 746 rc = -ENOMEM; 747 goto fail_reipl_file; 748 } 749 return 0; 750 751fail_reipl_file: 752 debugfs_remove(zcore_reipl_file); 753fail_memmap_file: 754 debugfs_remove(zcore_memmap_file); 755fail_file: 756 debugfs_remove(zcore_file); 757fail_dir: 758 debugfs_remove(zcore_dir); 759fail: 760 diag308(DIAG308_REL_HSA, NULL); 761 return rc; 762} 763 764static void __exit zcore_exit(void) 765{ 766 debug_unregister(zcore_dbf); 767 sclp_sdias_exit(); 768 free_page((unsigned long) ipl_block); 769 debugfs_remove(zcore_hsa_file); 770 debugfs_remove(zcore_reipl_file); 771 debugfs_remove(zcore_memmap_file); 772 debugfs_remove(zcore_file); 773 debugfs_remove(zcore_dir); 774 diag308(DIAG308_REL_HSA, NULL); 775} 776 777MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); 778MODULE_DESCRIPTION("zcore module for zfcpdump support"); 779MODULE_LICENSE("GPL"); 780 781subsys_initcall(zcore_init); 782module_exit(zcore_exit); 783