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