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 memcpy_real_user(void __user *dest, unsigned long src, size_t count)
 146 {
 147         static char buf[4096];
 148         int offs = 0, size;
 149
 150         while (offs < count) {
 151                 size = min(sizeof(buf), count - offs);
 152                 if (memcpy_real(buf, (void *) src + offs, size))
 153                         return -EFAULT;
 154                 if (copy_to_user(dest + offs, buf, size))
 155                         return -EFAULT;
 156                 offs += size;
 157         }
 158         return 0;
 159 }
 160
 161 static int __init init_cpu_info(enum arch_id arch)
 162 {
 163         struct save_area *sa;
 164
 165         /* get info for boot cpu from lowcore, stored in the HSA */
 166
 167         sa = kmalloc(sizeof(*sa), GFP_KERNEL);
 168         if (!sa)
 169                 return -ENOMEM;
 170         if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
 171                 TRACE("could not copy from HSA\n");
 172                 kfree(sa);
 173                 return -EIO;
 174         }
 175         zfcpdump_save_areas[0] = sa;
 176         return 0;
 177 }
 178
 179 static DEFINE_MUTEX(zcore_mutex);
 180
 181 #define DUMP_VERSION    0x5
 182 #define DUMP_MAGIC      0xa8190173618f23fdULL
 183 #define DUMP_ARCH_S390X 2
 184 #define DUMP_ARCH_S390  1
 185 #define HEADER_SIZE     4096
 186
 187 /* dump header dumped according to s390 crash dump format */
 188
 189 struct zcore_header {
 190         u64 magic;
 191         u32 version;
 192         u32 header_size;
 193         u32 dump_level;
 194         u32 page_size;
 195         u64 mem_size;
 196         u64 mem_start;
 197         u64 mem_end;
 198         u32 num_pages;
 199         u32 pad1;
 200         u64 tod;
 201         struct cpuid cpu_id;
 202         u32 arch_id;
 203         u32 volnr;
 204         u32 build_arch;
 205         u64 rmem_size;
 206         u8 mvdump;
 207         u16 cpu_cnt;
 208         u16 real_cpu_cnt;
 209         u8 end_pad1[0x200-0x061];
 210         u64 mvdump_sign;
 211         u64 mvdump_zipl_time;
 212         u8 end_pad2[0x800-0x210];
 213         u32 lc_vec[512];
 214 } __attribute__((packed,__aligned__(16)));
 215
 216 static struct zcore_header zcore_header = {
 217         .magic          = DUMP_MAGIC,
 218         .version        = DUMP_VERSION,
 219         .header_size    = 4096,
 220         .dump_level     = 0,
 221         .page_size      = PAGE_SIZE,
 222         .mem_start      = 0,
 223 #ifdef CONFIG_64BIT
 224         .build_arch     = DUMP_ARCH_S390X,
 225 #else
 226         .build_arch     = DUMP_ARCH_S390,
 227 #endif
 228 };
 229
 230 /*
 231  * Copy lowcore info to buffer. Use map in order to copy only register parts.
 232  *
 233  * @buf:    User buffer
 234  * @sa:     Pointer to save area
 235  * @sa_off: Offset in save area to copy
 236  * @len:    Number of bytes to copy
 237  */
 238 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
 239 {
 240         int i;
 241         char *lc_mask = (char*)&sys_info.lc_mask;
 242
 243         for (i = 0; i < len; i++) {
 244                 if (!lc_mask[i + sa_off])
 245                         continue;
 246                 if (copy_to_user(buf + i, sa + sa_off + i, 1))
 247                         return -EFAULT;
 248         }
 249         return 0;
 250 }
 251
 252 /*
 253  * Copy lowcores info to memory, if necessary
 254  *
 255  * @buf:   User buffer
 256  * @addr:  Start address of buffer in dump memory
 257  * @count: Size of buffer
 258  */
 259 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
 260 {
 261         unsigned long end;
 262         int i = 0;
 263
 264         if (count == 0)
 265                 return 0;
 266
 267         end = start + count;
 268         while (zfcpdump_save_areas[i]) {
 269                 unsigned long cp_start, cp_end; /* copy range */
 270                 unsigned long sa_start, sa_end; /* save area range */
 271                 unsigned long prefix;
 272                 unsigned long sa_off, len, buf_off;
 273
 274                 prefix = zfcpdump_save_areas[i]->pref_reg;
 275                 sa_start = prefix + sys_info.sa_base;
 276                 sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
 277
 278                 if ((end < sa_start) || (start > sa_end))
 279                         goto next;
 280                 cp_start = max(start, sa_start);
 281                 cp_end = min(end, sa_end);
 282
 283                 buf_off = cp_start - start;
 284                 sa_off = cp_start - sa_start;
 285                 len = cp_end - cp_start;
 286
 287                 TRACE("copy_lc for: %lx\n", start);
 288                 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
 289                         return -EFAULT;
 290 next:
 291                 i++;
 292         }
 293         return 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  */
 302 static 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 < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
 338                 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
 339                            - 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 = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
 350                               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;
 367 fail:
 368         mutex_unlock(&zcore_mutex);
 369         return (rc < 0) ? rc : count;
 370 }
 371
 372 static 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
 380 static int zcore_release(struct inode *inode, struct file *filep)
 381 {
 382         diag308(DIAG308_REL_HSA, NULL);
 383         hsa_available = 0;
 384         return 0;
 385 }
 386
 387 static 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
 408 static 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
 416 static 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                                        MEMORY_CHUNKS * CHUNK_INFO_SIZE);
 421 }
 422
 423 static int zcore_memmap_open(struct inode *inode, struct file *filp)
 424 {
 425         int i;
 426         char *buf;
 427         struct mem_chunk *chunk_array;
 428
 429         chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 430                               GFP_KERNEL);
 431         if (!chunk_array)
 432                 return -ENOMEM;
 433         detect_memory_layout(chunk_array);
 434         buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
 435         if (!buf) {
 436                 kfree(chunk_array);
 437                 return -ENOMEM;
 438         }
 439         for (i = 0; i < MEMORY_CHUNKS; i++) {
 440                 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
 441                         (unsigned long long) chunk_array[i].addr,
 442                         (unsigned long long) chunk_array[i].size);
 443                 if (chunk_array[i].size == 0)
 444                         break;
 445         }
 446         kfree(chunk_array);
 447         filp->private_data = buf;
 448         return nonseekable_open(inode, filp);
 449 }
 450
 451 static int zcore_memmap_release(struct inode *inode, struct file *filp)
 452 {
 453         kfree(filp->private_data);
 454         return 0;
 455 }
 456
 457 static const struct file_operations zcore_memmap_fops = {
 458         .owner          = THIS_MODULE,
 459         .read           = zcore_memmap_read,
 460         .open           = zcore_memmap_open,
 461         .release        = zcore_memmap_release,
 462         .llseek         = no_llseek,
 463 };
 464
 465 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
 466                                  size_t count, loff_t *ppos)
 467 {
 468         if (ipl_block) {
 469                 diag308(DIAG308_SET, ipl_block);
 470                 diag308(DIAG308_IPL, NULL);
 471         }
 472         return count;
 473 }
 474
 475 static int zcore_reipl_open(struct inode *inode, struct file *filp)
 476 {
 477         return nonseekable_open(inode, filp);
 478 }
 479
 480 static int zcore_reipl_release(struct inode *inode, struct file *filp)
 481 {
 482         return 0;
 483 }
 484
 485 static const struct file_operations zcore_reipl_fops = {
 486         .owner          = THIS_MODULE,
 487         .write          = zcore_reipl_write,
 488         .open           = zcore_reipl_open,
 489         .release        = zcore_reipl_release,
 490         .llseek         = no_llseek,
 491 };
 492
 493 #ifdef CONFIG_32BIT
 494
 495 static void __init set_lc_mask(struct save_area *map)
 496 {
 497         memset(&map->ext_save, 0xff, sizeof(map->ext_save));
 498         memset(&map->timer, 0xff, sizeof(map->timer));
 499         memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
 500         memset(&map->psw, 0xff, sizeof(map->psw));
 501         memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
 502         memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
 503         memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
 504         memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
 505         memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
 506 }
 507
 508 #else /* CONFIG_32BIT */
 509
 510 static void __init set_lc_mask(struct save_area *map)
 511 {
 512         memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
 513         memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
 514         memset(&map->psw, 0xff, sizeof(map->psw));
 515         memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
 516         memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
 517         memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
 518         memset(&map->timer, 0xff, sizeof(map->timer));
 519         memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
 520         memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
 521         memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
 522 }
 523
 524 #endif /* CONFIG_32BIT */
 525
 526 /*
 527  * Initialize dump globals for a given architecture
 528  */
 529 static int __init sys_info_init(enum arch_id arch)
 530 {
 531         int rc;
 532
 533         switch (arch) {
 534         case ARCH_S390X:
 535                 pr_alert("DETECTED 'S390X (64 bit) OS'\n");
 536                 break;
 537         case ARCH_S390:
 538                 pr_alert("DETECTED 'S390 (32 bit) OS'\n");
 539                 break;
 540         default:
 541                 pr_alert("0x%x is an unknown architecture.\n",arch);
 542                 return -EINVAL;
 543         }
 544         sys_info.sa_base = SAVE_AREA_BASE;
 545         sys_info.sa_size = sizeof(struct save_area);
 546         sys_info.arch = arch;
 547         set_lc_mask(&sys_info.lc_mask);
 548         rc = init_cpu_info(arch);
 549         if (rc)
 550                 return rc;
 551         sys_info.mem_size = real_memory_size;
 552
 553         return 0;
 554 }
 555
 556 static int __init check_sdias(void)
 557 {
 558         int rc, act_hsa_size;
 559
 560         rc = sclp_sdias_blk_count();
 561         if (rc < 0) {
 562                 TRACE("Could not determine HSA size\n");
 563                 return rc;
 564         }
 565         act_hsa_size = (rc - 1) * PAGE_SIZE;
 566         if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
 567                 TRACE("HSA size too small: %i\n", act_hsa_size);
 568                 return -EINVAL;
 569         }
 570         return 0;
 571 }
 572
 573 static int __init get_mem_size(unsigned long *mem)
 574 {
 575         int i;
 576         struct mem_chunk *chunk_array;
 577
 578         chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 579                               GFP_KERNEL);
 580         if (!chunk_array)
 581                 return -ENOMEM;
 582         detect_memory_layout(chunk_array);
 583         for (i = 0; i < MEMORY_CHUNKS; i++) {
 584                 if (chunk_array[i].size == 0)
 585                         break;
 586                 *mem += chunk_array[i].size;
 587         }
 588         kfree(chunk_array);
 589         return 0;
 590 }
 591
 592 static int __init zcore_header_init(int arch, struct zcore_header *hdr)
 593 {
 594         int rc, i;
 595         unsigned long memory = 0;
 596         u32 prefix;
 597
 598         if (arch == ARCH_S390X)
 599                 hdr->arch_id = DUMP_ARCH_S390X;
 600         else
 601                 hdr->arch_id = DUMP_ARCH_S390;
 602         rc = get_mem_size(&memory);
 603         if (rc)
 604                 return rc;
 605         hdr->mem_size = memory;
 606         hdr->rmem_size = memory;
 607         hdr->mem_end = sys_info.mem_size;
 608         hdr->num_pages = memory / PAGE_SIZE;
 609         hdr->tod = get_clock();
 610         get_cpu_id(&hdr->cpu_id);
 611         for (i = 0; zfcpdump_save_areas[i]; i++) {
 612                 prefix = zfcpdump_save_areas[i]->pref_reg;
 613                 hdr->real_cpu_cnt++;
 614                 if (!prefix)
 615                         continue;
 616                 hdr->lc_vec[hdr->cpu_cnt] = prefix;
 617                 hdr->cpu_cnt++;
 618         }
 619         return 0;
 620 }
 621
 622 /*
 623  * Provide IPL parameter information block from either HSA or memory
 624  * for future reipl
 625  */
 626 static int __init zcore_reipl_init(void)
 627 {
 628         struct ipib_info ipib_info;
 629         int rc;
 630
 631         rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
 632         if (rc)
 633                 return rc;
 634         if (ipib_info.ipib == 0)
 635                 return 0;
 636         ipl_block = (void *) __get_free_page(GFP_KERNEL);
 637         if (!ipl_block)
 638                 return -ENOMEM;
 639         if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE)
 640                 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
 641         else
 642                 rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
 643         if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
 644             ipib_info.checksum) {
 645                 TRACE("Checksum does not match\n");
 646                 free_page((unsigned long) ipl_block);
 647                 ipl_block = NULL;
 648         }
 649         return 0;
 650 }
 651
 652 static int __init zcore_init(void)
 653 {
 654         unsigned char arch;
 655         int rc;
 656
 657         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 658                 return -ENODATA;
 659
 660         zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
 661         debug_register_view(zcore_dbf, &debug_sprintf_view);
 662         debug_set_level(zcore_dbf, 6);
 663
 664         TRACE("devno:  %x\n", ipl_info.data.fcp.dev_id.devno);
 665         TRACE("wwpn:   %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
 666         TRACE("lun:    %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
 667
 668         rc = sclp_sdias_init();
 669         if (rc)
 670                 goto fail;
 671
 672         rc = check_sdias();
 673         if (rc)
 674                 goto fail;
 675
 676         rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
 677         if (rc)
 678                 goto fail;
 679
 680 #ifdef CONFIG_64BIT
 681         if (arch == ARCH_S390) {
 682                 pr_alert("The 64-bit dump tool cannot be used for a "
 683                          "32-bit system\n");
 684                 rc = -EINVAL;
 685                 goto fail;
 686         }
 687 #else /* CONFIG_64BIT */
 688         if (arch == ARCH_S390X) {
 689                 pr_alert("The 32-bit dump tool cannot be used for a "
 690                          "64-bit system\n");
 691                 rc = -EINVAL;
 692                 goto fail;
 693         }
 694 #endif /* CONFIG_64BIT */
 695
 696         rc = sys_info_init(arch);
 697         if (rc)
 698                 goto fail;
 699
 700         rc = zcore_header_init(arch, &zcore_header);
 701         if (rc)
 702                 goto fail;
 703
 704         rc = zcore_reipl_init();
 705         if (rc)
 706                 goto fail;
 707
 708         zcore_dir = debugfs_create_dir("zcore" , NULL);
 709         if (!zcore_dir) {
 710                 rc = -ENOMEM;
 711                 goto fail;
 712         }
 713         zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
 714                                          &zcore_fops);
 715         if (!zcore_file) {
 716                 rc = -ENOMEM;
 717                 goto fail_dir;
 718         }
 719         zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
 720                                                 NULL, &zcore_memmap_fops);
 721         if (!zcore_memmap_file) {
 722                 rc = -ENOMEM;
 723                 goto fail_file;
 724         }
 725         zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
 726                                                 NULL, &zcore_reipl_fops);
 727         if (!zcore_reipl_file) {
 728                 rc = -ENOMEM;
 729                 goto fail_memmap_file;
 730         }
 731         hsa_available = 1;
 732         return 0;
 733
 734 fail_memmap_file:
 735         debugfs_remove(zcore_memmap_file);
 736 fail_file:
 737         debugfs_remove(zcore_file);
 738 fail_dir:
 739         debugfs_remove(zcore_dir);
 740 fail:
 741         diag308(DIAG308_REL_HSA, NULL);
 742         return rc;
 743 }
 744
 745 static void __exit zcore_exit(void)
 746 {
 747         debug_unregister(zcore_dbf);
 748         sclp_sdias_exit();
 749         free_page((unsigned long) ipl_block);
 750         debugfs_remove(zcore_reipl_file);
 751         debugfs_remove(zcore_memmap_file);
 752         debugfs_remove(zcore_file);
 753         debugfs_remove(zcore_dir);
 754         diag308(DIAG308_REL_HSA, NULL);
 755 }
 756
 757 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
 758 MODULE_DESCRIPTION("zcore module for zfcpdump support");
 759 MODULE_LICENSE("GPL");
 760
 761 subsys_initcall(zcore_init);
 762 module_exit(zcore_exit);