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/miscdevice.h> 17 #include <linux/debugfs.h> 18 #include <asm/ipl.h> 19 #include <asm/sclp.h> 20 #include <asm/setup.h> 21 #include <asm/sigp.h> 22 #include <asm/uaccess.h> 23 #include <asm/debug.h> 24 #include <asm/processor.h> 25 #include <asm/irqflags.h> 26 #include <asm/checksum.h> 27 #include "sclp.h" 28 29 #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) 30 31 #define TO_USER 0 32 #define TO_KERNEL 1 33 #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ 34 35 enum arch_id { 36 ARCH_S390 = 0, 37 ARCH_S390X = 1, 38 }; 39 40 /* dump system info */ 41 42 struct sys_info { 43 enum arch_id arch; 44 unsigned long sa_base; 45 u32 sa_size; 46 int cpu_map[NR_CPUS]; 47 unsigned long mem_size; 48 union save_area lc_mask; 49 }; 50 51 struct ipib_info { 52 unsigned long ipib; 53 u32 checksum; 54 } __attribute__((packed)); 55 56 static struct sys_info sys_info; 57 static struct debug_info *zcore_dbf; 58 static int hsa_available; 59 static struct dentry *zcore_dir; 60 static struct dentry *zcore_file; 61 static struct dentry *zcore_memmap_file; 62 static struct dentry *zcore_reipl_file; 63 static struct ipl_parameter_block *ipl_block; 64 65 /* 66 * Copy memory from HSA to kernel or user memory (not reentrant): 67 * 68 * @dest: Kernel or user buffer where memory should be copied to 69 * @src: Start address within HSA where data should be copied 70 * @count: Size of buffer, which should be copied 71 * @mode: Either TO_KERNEL or TO_USER 72 */ 73 static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) 74 { 75 int offs, blk_num; 76 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 77 78 if (count == 0) 79 return 0; 80 81 /* copy first block */ 82 offs = 0; 83 if ((src % PAGE_SIZE) != 0) { 84 blk_num = src / PAGE_SIZE + 2; 85 if (sclp_sdias_copy(buf, blk_num, 1)) { 86 TRACE("sclp_sdias_copy() failed\n"); 87 return -EIO; 88 } 89 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); 90 if (mode == TO_USER) { 91 if (copy_to_user((__force __user void*) dest, 92 buf + (src % PAGE_SIZE), offs)) 93 return -EFAULT; 94 } else 95 memcpy(dest, buf + (src % PAGE_SIZE), offs); 96 } 97 if (offs == count) 98 goto out; 99 100 /* copy middle */ 101 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { 102 blk_num = (src + offs) / PAGE_SIZE + 2; 103 if (sclp_sdias_copy(buf, blk_num, 1)) { 104 TRACE("sclp_sdias_copy() failed\n"); 105 return -EIO; 106 } 107 if (mode == TO_USER) { 108 if (copy_to_user((__force __user void*) dest + offs, 109 buf, PAGE_SIZE)) 110 return -EFAULT; 111 } else 112 memcpy(dest + offs, buf, PAGE_SIZE); 113 } 114 if (offs == count) 115 goto out; 116 117 /* copy last block */ 118 blk_num = (src + offs) / PAGE_SIZE + 2; 119 if (sclp_sdias_copy(buf, blk_num, 1)) { 120 TRACE("sclp_sdias_copy() failed\n"); 121 return -EIO; 122 } 123 if (mode == TO_USER) { 124 if (copy_to_user((__force __user void*) dest + offs, buf, 125 PAGE_SIZE)) 126 return -EFAULT; 127 } else 128 memcpy(dest + offs, buf, count - offs); 129 out: 130 return 0; 131 } 132 133 static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) 134 { 135 return memcpy_hsa((void __force *) dest, src, count, TO_USER); 136 } 137 138 static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) 139 { 140 return memcpy_hsa(dest, src, count, TO_KERNEL); 141 } 142 143 static int memcpy_real(void *dest, unsigned long src, size_t count) 144 { 145 unsigned long flags; 146 int rc = -EFAULT; 147 register unsigned long _dest asm("2") = (unsigned long) dest; 148 register unsigned long _len1 asm("3") = (unsigned long) count; 149 register unsigned long _src asm("4") = src; 150 register unsigned long _len2 asm("5") = (unsigned long) count; 151 152 if (count == 0) 153 return 0; 154 flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */ 155 asm volatile ( 156 "0: mvcle %1,%2,0x0\n" 157 "1: jo 0b\n" 158 " lhi %0,0x0\n" 159 "2:\n" 160 EX_TABLE(1b,2b) 161 : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1), 162 "+d" (_len2), "=m" (*((long*)dest)) 163 : "m" (*((long*)src)) 164 : "cc", "memory"); 165 __raw_local_irq_ssm(flags); 166 167 return rc; 168 } 169 170 static int memcpy_real_user(void __user *dest, unsigned long src, size_t count) 171 { 172 static char buf[4096]; 173 int offs = 0, size; 174 175 while (offs < count) { 176 size = min(sizeof(buf), count - offs); 177 if (memcpy_real(buf, src + offs, size)) 178 return -EFAULT; 179 if (copy_to_user(dest + offs, buf, size)) 180 return -EFAULT; 181 offs += size; 182 } 183 return 0; 184 } 185 186 #ifdef __s390x__ 187 /* 188 * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info 189 */ 190 static void __init s390x_to_s390_regs(union save_area *out, union save_area *in, 191 int cpu) 192 { 193 int i; 194 195 for (i = 0; i < 16; i++) { 196 out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff; 197 out->s390.acc_regs[i] = in->s390x.acc_regs[i]; 198 out->s390.ctrl_regs[i] = 199 in->s390x.ctrl_regs[i] & 0x00000000ffffffff; 200 } 201 /* locore for 31 bit has only space for fpregs 0,2,4,6 */ 202 out->s390.fp_regs[0] = in->s390x.fp_regs[0]; 203 out->s390.fp_regs[1] = in->s390x.fp_regs[2]; 204 out->s390.fp_regs[2] = in->s390x.fp_regs[4]; 205 out->s390.fp_regs[3] = in->s390x.fp_regs[6]; 206 memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4); 207 out->s390.psw[1] |= 0x8; /* set bit 12 */ 208 memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4); 209 out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */ 210 out->s390.pref_reg = in->s390x.pref_reg; 211 out->s390.timer = in->s390x.timer; 212 out->s390.clk_cmp = in->s390x.clk_cmp; 213 } 214 215 static void __init s390x_to_s390_save_areas(void) 216 { 217 int i = 1; 218 static union save_area tmp; 219 220 while (zfcpdump_save_areas[i]) { 221 s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i); 222 memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp)); 223 i++; 224 } 225 } 226 227 #endif /* __s390x__ */ 228 229 static int __init init_cpu_info(enum arch_id arch) 230 { 231 union save_area *sa; 232 233 /* get info for boot cpu from lowcore, stored in the HSA */ 234 235 sa = kmalloc(sizeof(*sa), GFP_KERNEL); 236 if (!sa) 237 return -ENOMEM; 238 if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) { 239 TRACE("could not copy from HSA\n"); 240 kfree(sa); 241 return -EIO; 242 } 243 zfcpdump_save_areas[0] = sa; 244 245 #ifdef __s390x__ 246 /* convert s390x regs to s390, if we are dumping an s390 Linux */ 247 248 if (arch == ARCH_S390) 249 s390x_to_s390_save_areas(); 250 #endif 251 252 return 0; 253 } 254 255 static DEFINE_MUTEX(zcore_mutex); 256 257 #define DUMP_VERSION 0x3 258 #define DUMP_MAGIC 0xa8190173618f23fdULL 259 #define DUMP_ARCH_S390X 2 260 #define DUMP_ARCH_S390 1 261 #define HEADER_SIZE 4096 262 263 /* dump header dumped according to s390 crash dump format */ 264 265 struct zcore_header { 266 u64 magic; 267 u32 version; 268 u32 header_size; 269 u32 dump_level; 270 u32 page_size; 271 u64 mem_size; 272 u64 mem_start; 273 u64 mem_end; 274 u32 num_pages; 275 u32 pad1; 276 u64 tod; 277 struct cpuid cpu_id; 278 u32 arch_id; 279 u32 volnr; 280 u32 build_arch; 281 u64 rmem_size; 282 char pad2[4016]; 283 } __attribute__((packed,__aligned__(16))); 284 285 static struct zcore_header zcore_header = { 286 .magic = DUMP_MAGIC, 287 .version = DUMP_VERSION, 288 .header_size = 4096, 289 .dump_level = 0, 290 .page_size = PAGE_SIZE, 291 .mem_start = 0, 292 #ifdef __s390x__ 293 .build_arch = DUMP_ARCH_S390X, 294 #else 295 .build_arch = DUMP_ARCH_S390, 296 #endif 297 }; 298 299 /* 300 * Copy lowcore info to buffer. Use map in order to copy only register parts. 301 * 302 * @buf: User buffer 303 * @sa: Pointer to save area 304 * @sa_off: Offset in save area to copy 305 * @len: Number of bytes to copy 306 */ 307 static int copy_lc(void __user *buf, void *sa, int sa_off, int len) 308 { 309 int i; 310 char *lc_mask = (char*)&sys_info.lc_mask; 311 312 for (i = 0; i < len; i++) { 313 if (!lc_mask[i + sa_off]) 314 continue; 315 if (copy_to_user(buf + i, sa + sa_off + i, 1)) 316 return -EFAULT; 317 } 318 return 0; 319 } 320 321 /* 322 * Copy lowcores info to memory, if necessary 323 * 324 * @buf: User buffer 325 * @addr: Start address of buffer in dump memory 326 * @count: Size of buffer 327 */ 328 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) 329 { 330 unsigned long end; 331 int i = 0; 332 333 if (count == 0) 334 return 0; 335 336 end = start + count; 337 while (zfcpdump_save_areas[i]) { 338 unsigned long cp_start, cp_end; /* copy range */ 339 unsigned long sa_start, sa_end; /* save area range */ 340 unsigned long prefix; 341 unsigned long sa_off, len, buf_off; 342 343 if (sys_info.arch == ARCH_S390) 344 prefix = zfcpdump_save_areas[i]->s390.pref_reg; 345 else 346 prefix = zfcpdump_save_areas[i]->s390x.pref_reg; 347 348 sa_start = prefix + sys_info.sa_base; 349 sa_end = prefix + sys_info.sa_base + sys_info.sa_size; 350 351 if ((end < sa_start) || (start > sa_end)) 352 goto next; 353 cp_start = max(start, sa_start); 354 cp_end = min(end, sa_end); 355 356 buf_off = cp_start - start; 357 sa_off = cp_start - sa_start; 358 len = cp_end - cp_start; 359 360 TRACE("copy_lc for: %lx\n", start); 361 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len)) 362 return -EFAULT; 363 next: 364 i++; 365 } 366 return 0; 367 } 368 369 /* 370 * Read routine for zcore character device 371 * First 4K are dump header 372 * Next 32MB are HSA Memory 373 * Rest is read from absolute Memory 374 */ 375 static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, 376 loff_t *ppos) 377 { 378 unsigned long mem_start; /* Start address in memory */ 379 size_t mem_offs; /* Offset in dump memory */ 380 size_t hdr_count; /* Size of header part of output buffer */ 381 size_t size; 382 int rc; 383 384 mutex_lock(&zcore_mutex); 385 386 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { 387 rc = -EINVAL; 388 goto fail; 389 } 390 391 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); 392 393 /* Copy dump header */ 394 if (*ppos < HEADER_SIZE) { 395 size = min(count, (size_t) (HEADER_SIZE - *ppos)); 396 if (copy_to_user(buf, &zcore_header + *ppos, size)) { 397 rc = -EFAULT; 398 goto fail; 399 } 400 hdr_count = size; 401 mem_start = 0; 402 } else { 403 hdr_count = 0; 404 mem_start = *ppos - HEADER_SIZE; 405 } 406 407 mem_offs = 0; 408 409 /* Copy from HSA data */ 410 if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) { 411 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE 412 - mem_start)); 413 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); 414 if (rc) 415 goto fail; 416 417 mem_offs += size; 418 } 419 420 /* Copy from real mem */ 421 size = count - mem_offs - hdr_count; 422 rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs, 423 size); 424 if (rc) 425 goto fail; 426 427 /* 428 * Since s390 dump analysis tools like lcrash or crash 429 * expect register sets in the prefix pages of the cpus, 430 * we copy them into the read buffer, if necessary. 431 * buf + hdr_count: Start of memory part of output buffer 432 * mem_start: Start memory address to copy from 433 * count - hdr_count: Size of memory area to copy 434 */ 435 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { 436 rc = -EFAULT; 437 goto fail; 438 } 439 *ppos += count; 440 fail: 441 mutex_unlock(&zcore_mutex); 442 return (rc < 0) ? rc : count; 443 } 444 445 static int zcore_open(struct inode *inode, struct file *filp) 446 { 447 if (!hsa_available) 448 return -ENODATA; 449 else 450 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; 451 } 452 453 static int zcore_release(struct inode *inode, struct file *filep) 454 { 455 diag308(DIAG308_REL_HSA, NULL); 456 hsa_available = 0; 457 return 0; 458 } 459 460 static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) 461 { 462 loff_t rc; 463 464 mutex_lock(&zcore_mutex); 465 switch (orig) { 466 case 0: 467 file->f_pos = offset; 468 rc = file->f_pos; 469 break; 470 case 1: 471 file->f_pos += offset; 472 rc = file->f_pos; 473 break; 474 default: 475 rc = -EINVAL; 476 } 477 mutex_unlock(&zcore_mutex); 478 return rc; 479 } 480 481 static const struct file_operations zcore_fops = { 482 .owner = THIS_MODULE, 483 .llseek = zcore_lseek, 484 .read = zcore_read, 485 .open = zcore_open, 486 .release = zcore_release, 487 }; 488 489 static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, 490 size_t count, loff_t *ppos) 491 { 492 return simple_read_from_buffer(buf, count, ppos, filp->private_data, 493 MEMORY_CHUNKS * CHUNK_INFO_SIZE); 494 } 495 496 static int zcore_memmap_open(struct inode *inode, struct file *filp) 497 { 498 int i; 499 char *buf; 500 struct mem_chunk *chunk_array; 501 502 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), 503 GFP_KERNEL); 504 if (!chunk_array) 505 return -ENOMEM; 506 detect_memory_layout(chunk_array); 507 buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL); 508 if (!buf) { 509 kfree(chunk_array); 510 return -ENOMEM; 511 } 512 for (i = 0; i < MEMORY_CHUNKS; i++) { 513 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ", 514 (unsigned long long) chunk_array[i].addr, 515 (unsigned long long) chunk_array[i].size); 516 if (chunk_array[i].size == 0) 517 break; 518 } 519 kfree(chunk_array); 520 filp->private_data = buf; 521 return 0; 522 } 523 524 static int zcore_memmap_release(struct inode *inode, struct file *filp) 525 { 526 kfree(filp->private_data); 527 return 0; 528 } 529 530 static const struct file_operations zcore_memmap_fops = { 531 .owner = THIS_MODULE, 532 .read = zcore_memmap_read, 533 .open = zcore_memmap_open, 534 .release = zcore_memmap_release, 535 }; 536 537 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, 538 size_t count, loff_t *ppos) 539 { 540 if (ipl_block) { 541 diag308(DIAG308_SET, ipl_block); 542 diag308(DIAG308_IPL, NULL); 543 } 544 return count; 545 } 546 547 static int zcore_reipl_open(struct inode *inode, struct file *filp) 548 { 549 return 0; 550 } 551 552 static int zcore_reipl_release(struct inode *inode, struct file *filp) 553 { 554 return 0; 555 } 556 557 static const struct file_operations zcore_reipl_fops = { 558 .owner = THIS_MODULE, 559 .write = zcore_reipl_write, 560 .open = zcore_reipl_open, 561 .release = zcore_reipl_release, 562 }; 563 564 565 static void __init set_s390_lc_mask(union save_area *map) 566 { 567 memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save)); 568 memset(&map->s390.timer, 0xff, sizeof(map->s390.timer)); 569 memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp)); 570 memset(&map->s390.psw, 0xff, sizeof(map->s390.psw)); 571 memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg)); 572 memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs)); 573 memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs)); 574 memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs)); 575 memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs)); 576 } 577 578 static void __init set_s390x_lc_mask(union save_area *map) 579 { 580 memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs)); 581 memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs)); 582 memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw)); 583 memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg)); 584 memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg)); 585 memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg)); 586 memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer)); 587 memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp)); 588 memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs)); 589 memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs)); 590 } 591 592 /* 593 * Initialize dump globals for a given architecture 594 */ 595 static int __init sys_info_init(enum arch_id arch) 596 { 597 int rc; 598 599 switch (arch) { 600 case ARCH_S390X: 601 pr_alert("DETECTED 'S390X (64 bit) OS'\n"); 602 sys_info.sa_base = SAVE_AREA_BASE_S390X; 603 sys_info.sa_size = sizeof(struct save_area_s390x); 604 set_s390x_lc_mask(&sys_info.lc_mask); 605 break; 606 case ARCH_S390: 607 pr_alert("DETECTED 'S390 (32 bit) OS'\n"); 608 sys_info.sa_base = SAVE_AREA_BASE_S390; 609 sys_info.sa_size = sizeof(struct save_area_s390); 610 set_s390_lc_mask(&sys_info.lc_mask); 611 break; 612 default: 613 pr_alert("0x%x is an unknown architecture.\n",arch); 614 return -EINVAL; 615 } 616 sys_info.arch = arch; 617 rc = init_cpu_info(arch); 618 if (rc) 619 return rc; 620 sys_info.mem_size = real_memory_size; 621 622 return 0; 623 } 624 625 static int __init check_sdias(void) 626 { 627 int rc, act_hsa_size; 628 629 rc = sclp_sdias_blk_count(); 630 if (rc < 0) { 631 TRACE("Could not determine HSA size\n"); 632 return rc; 633 } 634 act_hsa_size = (rc - 1) * PAGE_SIZE; 635 if (act_hsa_size < ZFCPDUMP_HSA_SIZE) { 636 TRACE("HSA size too small: %i\n", act_hsa_size); 637 return -EINVAL; 638 } 639 return 0; 640 } 641 642 static int __init get_mem_size(unsigned long *mem) 643 { 644 int i; 645 struct mem_chunk *chunk_array; 646 647 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), 648 GFP_KERNEL); 649 if (!chunk_array) 650 return -ENOMEM; 651 detect_memory_layout(chunk_array); 652 for (i = 0; i < MEMORY_CHUNKS; i++) { 653 if (chunk_array[i].size == 0) 654 break; 655 *mem += chunk_array[i].size; 656 } 657 kfree(chunk_array); 658 return 0; 659 } 660 661 static int __init zcore_header_init(int arch, struct zcore_header *hdr) 662 { 663 int rc; 664 unsigned long memory = 0; 665 666 if (arch == ARCH_S390X) 667 hdr->arch_id = DUMP_ARCH_S390X; 668 else 669 hdr->arch_id = DUMP_ARCH_S390; 670 rc = get_mem_size(&memory); 671 if (rc) 672 return rc; 673 hdr->mem_size = memory; 674 hdr->rmem_size = memory; 675 hdr->mem_end = sys_info.mem_size; 676 hdr->num_pages = memory / PAGE_SIZE; 677 hdr->tod = get_clock(); 678 get_cpu_id(&hdr->cpu_id); 679 return 0; 680 } 681 682 /* 683 * Provide IPL parameter information block from either HSA or memory 684 * for future reipl 685 */ 686 static int __init zcore_reipl_init(void) 687 { 688 struct ipib_info ipib_info; 689 int rc; 690 691 rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); 692 if (rc) 693 return rc; 694 if (ipib_info.ipib == 0) 695 return 0; 696 ipl_block = (void *) __get_free_page(GFP_KERNEL); 697 if (!ipl_block) 698 return -ENOMEM; 699 if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE) 700 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); 701 else 702 rc = memcpy_real(ipl_block, ipib_info.ipib, PAGE_SIZE); 703 if (rc) { 704 free_page((unsigned long) ipl_block); 705 return rc; 706 } 707 if (csum_partial(ipl_block, ipl_block->hdr.len, 0) != 708 ipib_info.checksum) { 709 TRACE("Checksum does not match\n"); 710 free_page((unsigned long) ipl_block); 711 ipl_block = NULL; 712 } 713 return 0; 714 } 715 716 static int __init zcore_init(void) 717 { 718 unsigned char arch; 719 int rc; 720 721 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 722 return -ENODATA; 723 724 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); 725 debug_register_view(zcore_dbf, &debug_sprintf_view); 726 debug_set_level(zcore_dbf, 6); 727 728 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); 729 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); 730 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); 731 732 rc = sclp_sdias_init(); 733 if (rc) 734 goto fail; 735 736 rc = check_sdias(); 737 if (rc) 738 goto fail; 739 740 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); 741 if (rc) 742 goto fail; 743 744 #ifndef __s390x__ 745 if (arch == ARCH_S390X) { 746 pr_alert("The 32-bit dump tool cannot be used for a " 747 "64-bit system\n"); 748 rc = -EINVAL; 749 goto fail; 750 } 751 #endif 752 753 rc = sys_info_init(arch); 754 if (rc) 755 goto fail; 756 757 rc = zcore_header_init(arch, &zcore_header); 758 if (rc) 759 goto fail; 760 761 rc = zcore_reipl_init(); 762 if (rc) 763 goto fail; 764 765 zcore_dir = debugfs_create_dir("zcore" , NULL); 766 if (!zcore_dir) { 767 rc = -ENOMEM; 768 goto fail; 769 } 770 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, 771 &zcore_fops); 772 if (!zcore_file) { 773 rc = -ENOMEM; 774 goto fail_dir; 775 } 776 zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, 777 NULL, &zcore_memmap_fops); 778 if (!zcore_memmap_file) { 779 rc = -ENOMEM; 780 goto fail_file; 781 } 782 zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, 783 NULL, &zcore_reipl_fops); 784 if (!zcore_reipl_file) { 785 rc = -ENOMEM; 786 goto fail_memmap_file; 787 } 788 hsa_available = 1; 789 return 0; 790 791 fail_memmap_file: 792 debugfs_remove(zcore_memmap_file); 793 fail_file: 794 debugfs_remove(zcore_file); 795 fail_dir: 796 debugfs_remove(zcore_dir); 797 fail: 798 diag308(DIAG308_REL_HSA, NULL); 799 return rc; 800 } 801 802 static void __exit zcore_exit(void) 803 { 804 debug_unregister(zcore_dbf); 805 sclp_sdias_exit(); 806 free_page((unsigned long) ipl_block); 807 debugfs_remove(zcore_reipl_file); 808 debugfs_remove(zcore_memmap_file); 809 debugfs_remove(zcore_file); 810 debugfs_remove(zcore_dir); 811 diag308(DIAG308_REL_HSA, NULL); 812 } 813 814 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); 815 MODULE_DESCRIPTION("zcore module for zfcpdump support"); 816 MODULE_LICENSE("GPL"); 817 818 subsys_initcall(zcore_init); 819 module_exit(zcore_exit); 820