drivers/s390/char/zcore.c

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