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