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/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         1
  34 #define TO_KERNEL       0
  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 dentry *zcore_hsa_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 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 (!hsa_available)
  82                 return -ENODATA;
  83         if (count == 0)
  84                 return 0;
  85
  86         /* copy first block */
  87         offs = 0;
  88         if ((src % PAGE_SIZE) != 0) {
  89                 blk_num = src / PAGE_SIZE + 2;
  90                 if (sclp_sdias_copy(buf, blk_num, 1)) {
  91                         TRACE("sclp_sdias_copy() failed\n");
  92                         return -EIO;
  93                 }
  94                 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
  95                 if (mode == TO_USER) {
  96                         if (copy_to_user((__force __user void*) dest,
  97                                          buf + (src % PAGE_SIZE), offs))
  98                                 return -EFAULT;
  99                 } else
 100                         memcpy(dest, buf + (src % PAGE_SIZE), offs);
 101         }
 102         if (offs == count)
 103                 goto out;
 104
 105         /* copy middle */
 106         for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
 107                 blk_num = (src + offs) / PAGE_SIZE + 2;
 108                 if (sclp_sdias_copy(buf, blk_num, 1)) {
 109                         TRACE("sclp_sdias_copy() failed\n");
 110                         return -EIO;
 111                 }
 112                 if (mode == TO_USER) {
 113                         if (copy_to_user((__force __user void*) dest + offs,
 114                                          buf, PAGE_SIZE))
 115                                 return -EFAULT;
 116                 } else
 117                         memcpy(dest + offs, buf, PAGE_SIZE);
 118         }
 119         if (offs == count)
 120                 goto out;
 121
 122         /* copy last block */
 123         blk_num = (src + offs) / PAGE_SIZE + 2;
 124         if (sclp_sdias_copy(buf, blk_num, 1)) {
 125                 TRACE("sclp_sdias_copy() failed\n");
 126                 return -EIO;
 127         }
 128         if (mode == TO_USER) {
 129                 if (copy_to_user((__force __user void*) dest + offs, buf,
 130                                  count - offs))
 131                         return -EFAULT;
 132         } else
 133                 memcpy(dest + offs, buf, count - offs);
 134 out:
 135         return 0;
 136 }
 137
 138 static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
 139 {
 140         return memcpy_hsa((void __force *) dest, src, count, TO_USER);
 141 }
 142
 143 static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
 144 {
 145         return memcpy_hsa(dest, src, count, TO_KERNEL);
 146 }
 147
 148 static int __init init_cpu_info(enum arch_id arch)
 149 {
 150         struct save_area *sa;
 151
 152         /* get info for boot cpu from lowcore, stored in the HSA */
 153
 154         sa = kmalloc(sizeof(*sa), GFP_KERNEL);
 155         if (!sa)
 156                 return -ENOMEM;
 157         if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
 158                 TRACE("could not copy from HSA\n");
 159                 kfree(sa);
 160                 return -EIO;
 161         }
 162         zfcpdump_save_areas[0] = sa;
 163         return 0;
 164 }
 165
 166 static DEFINE_MUTEX(zcore_mutex);
 167
 168 #define DUMP_VERSION    0x5
 169 #define DUMP_MAGIC      0xa8190173618f23fdULL
 170 #define DUMP_ARCH_S390X 2
 171 #define DUMP_ARCH_S390  1
 172 #define HEADER_SIZE     4096
 173
 174 /* dump header dumped according to s390 crash dump format */
 175
 176 struct zcore_header {
 177         u64 magic;
 178         u32 version;
 179         u32 header_size;
 180         u32 dump_level;
 181         u32 page_size;
 182         u64 mem_size;
 183         u64 mem_start;
 184         u64 mem_end;
 185         u32 num_pages;
 186         u32 pad1;
 187         u64 tod;
 188         struct cpuid cpu_id;
 189         u32 arch_id;
 190         u32 volnr;
 191         u32 build_arch;
 192         u64 rmem_size;
 193         u8 mvdump;
 194         u16 cpu_cnt;
 195         u16 real_cpu_cnt;
 196         u8 end_pad1[0x200-0x061];
 197         u64 mvdump_sign;
 198         u64 mvdump_zipl_time;
 199         u8 end_pad2[0x800-0x210];
 200         u32 lc_vec[512];
 201 } __attribute__((packed,__aligned__(16)));
 202
 203 static struct zcore_header zcore_header = {
 204         .magic          = DUMP_MAGIC,
 205         .version        = DUMP_VERSION,
 206         .header_size    = 4096,
 207         .dump_level     = 0,
 208         .page_size      = PAGE_SIZE,
 209         .mem_start      = 0,
 210 #ifdef CONFIG_64BIT
 211         .build_arch     = DUMP_ARCH_S390X,
 212 #else
 213         .build_arch     = DUMP_ARCH_S390,
 214 #endif
 215 };
 216
 217 /*
 218  * Copy lowcore info to buffer. Use map in order to copy only register parts.
 219  *
 220  * @buf:    User buffer
 221  * @sa:     Pointer to save area
 222  * @sa_off: Offset in save area to copy
 223  * @len:    Number of bytes to copy
 224  */
 225 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
 226 {
 227         int i;
 228         char *lc_mask = (char*)&sys_info.lc_mask;
 229
 230         for (i = 0; i < len; i++) {
 231                 if (!lc_mask[i + sa_off])
 232                         continue;
 233                 if (copy_to_user(buf + i, sa + sa_off + i, 1))
 234                         return -EFAULT;
 235         }
 236         return 0;
 237 }
 238
 239 /*
 240  * Copy lowcores info to memory, if necessary
 241  *
 242  * @buf:   User buffer
 243  * @addr:  Start address of buffer in dump memory
 244  * @count: Size of buffer
 245  */
 246 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
 247 {
 248         unsigned long end;
 249         int i = 0;
 250
 251         if (count == 0)
 252                 return 0;
 253
 254         end = start + count;
 255         while (zfcpdump_save_areas[i]) {
 256                 unsigned long cp_start, cp_end; /* copy range */
 257                 unsigned long sa_start, sa_end; /* save area range */
 258                 unsigned long prefix;
 259                 unsigned long sa_off, len, buf_off;
 260
 261                 prefix = zfcpdump_save_areas[i]->pref_reg;
 262                 sa_start = prefix + sys_info.sa_base;
 263                 sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
 264
 265                 if ((end < sa_start) || (start > sa_end))
 266                         goto next;
 267                 cp_start = max(start, sa_start);
 268                 cp_end = min(end, sa_end);
 269
 270                 buf_off = cp_start - start;
 271                 sa_off = cp_start - sa_start;
 272                 len = cp_end - cp_start;
 273
 274                 TRACE("copy_lc for: %lx\n", start);
 275                 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
 276                         return -EFAULT;
 277 next:
 278                 i++;
 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 < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
 334                 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
 335                            - 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                                        MEMORY_CHUNKS * CHUNK_INFO_SIZE);
 417 }
 418
 419 static int zcore_memmap_open(struct inode *inode, struct file *filp)
 420 {
 421         int i;
 422         char *buf;
 423         struct mem_chunk *chunk_array;
 424
 425         chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 426                               GFP_KERNEL);
 427         if (!chunk_array)
 428                 return -ENOMEM;
 429         detect_memory_layout(chunk_array, 0);
 430         buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
 431         if (!buf) {
 432                 kfree(chunk_array);
 433                 return -ENOMEM;
 434         }
 435         for (i = 0; i < MEMORY_CHUNKS; i++) {
 436                 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
 437                         (unsigned long long) chunk_array[i].addr,
 438                         (unsigned long long) chunk_array[i].size);
 439                 if (chunk_array[i].size == 0)
 440                         break;
 441         }
 442         kfree(chunk_array);
 443         filp->private_data = buf;
 444         return nonseekable_open(inode, filp);
 445 }
 446
 447 static int zcore_memmap_release(struct inode *inode, struct file *filp)
 448 {
 449         kfree(filp->private_data);
 450         return 0;
 451 }
 452
 453 static const struct file_operations zcore_memmap_fops = {
 454         .owner          = THIS_MODULE,
 455         .read           = zcore_memmap_read,
 456         .open           = zcore_memmap_open,
 457         .release        = zcore_memmap_release,
 458         .llseek         = no_llseek,
 459 };
 460
 461 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
 462                                  size_t count, loff_t *ppos)
 463 {
 464         if (ipl_block) {
 465                 diag308(DIAG308_SET, ipl_block);
 466                 diag308(DIAG308_IPL, NULL);
 467         }
 468         return count;
 469 }
 470
 471 static int zcore_reipl_open(struct inode *inode, struct file *filp)
 472 {
 473         return nonseekable_open(inode, filp);
 474 }
 475
 476 static int zcore_reipl_release(struct inode *inode, struct file *filp)
 477 {
 478         return 0;
 479 }
 480
 481 static const struct file_operations zcore_reipl_fops = {
 482         .owner          = THIS_MODULE,
 483         .write          = zcore_reipl_write,
 484         .open           = zcore_reipl_open,
 485         .release        = zcore_reipl_release,
 486         .llseek         = no_llseek,
 487 };
 488
 489 static ssize_t zcore_hsa_read(struct file *filp, char __user *buf,
 490                               size_t count, loff_t *ppos)
 491 {
 492         static char str[18];
 493
 494         if (hsa_available)
 495                 snprintf(str, sizeof(str), "%lx\n", ZFCPDUMP_HSA_SIZE);
 496         else
 497                 snprintf(str, sizeof(str), "0\n");
 498         return simple_read_from_buffer(buf, count, ppos, str, strlen(str));
 499 }
 500
 501 static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf,
 502                                size_t count, loff_t *ppos)
 503 {
 504         char value;
 505
 506         if (*ppos != 0)
 507                 return -EPIPE;
 508         if (copy_from_user(&value, buf, 1))
 509                 return -EFAULT;
 510         if (value != '0')
 511                 return -EINVAL;
 512         release_hsa();
 513         return count;
 514 }
 515
 516 static const struct file_operations zcore_hsa_fops = {
 517         .owner          = THIS_MODULE,
 518         .write          = zcore_hsa_write,
 519         .read           = zcore_hsa_read,
 520         .open           = nonseekable_open,
 521         .llseek         = no_llseek,
 522 };
 523
 524 #ifdef CONFIG_32BIT
 525
 526 static void __init set_lc_mask(struct save_area *map)
 527 {
 528         memset(&map->ext_save, 0xff, sizeof(map->ext_save));
 529         memset(&map->timer, 0xff, sizeof(map->timer));
 530         memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
 531         memset(&map->psw, 0xff, sizeof(map->psw));
 532         memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
 533         memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
 534         memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
 535         memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
 536         memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
 537 }
 538
 539 #else /* CONFIG_32BIT */
 540
 541 static void __init set_lc_mask(struct save_area *map)
 542 {
 543         memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
 544         memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
 545         memset(&map->psw, 0xff, sizeof(map->psw));
 546         memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
 547         memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
 548         memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
 549         memset(&map->timer, 0xff, sizeof(map->timer));
 550         memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
 551         memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
 552         memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
 553 }
 554
 555 #endif /* CONFIG_32BIT */
 556
 557 /*
 558  * Initialize dump globals for a given architecture
 559  */
 560 static int __init sys_info_init(enum arch_id arch, unsigned long mem_end)
 561 {
 562         int rc;
 563
 564         switch (arch) {
 565         case ARCH_S390X:
 566                 pr_alert("DETECTED 'S390X (64 bit) OS'\n");
 567                 break;
 568         case ARCH_S390:
 569                 pr_alert("DETECTED 'S390 (32 bit) OS'\n");
 570                 break;
 571         default:
 572                 pr_alert("0x%x is an unknown architecture.\n",arch);
 573                 return -EINVAL;
 574         }
 575         sys_info.sa_base = SAVE_AREA_BASE;
 576         sys_info.sa_size = sizeof(struct save_area);
 577         sys_info.arch = arch;
 578         set_lc_mask(&sys_info.lc_mask);
 579         rc = init_cpu_info(arch);
 580         if (rc)
 581                 return rc;
 582         sys_info.mem_size = mem_end;
 583
 584         return 0;
 585 }
 586
 587 static int __init check_sdias(void)
 588 {
 589         int rc, act_hsa_size;
 590
 591         rc = sclp_sdias_blk_count();
 592         if (rc < 0) {
 593                 TRACE("Could not determine HSA size\n");
 594                 return rc;
 595         }
 596         act_hsa_size = (rc - 1) * PAGE_SIZE;
 597         if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
 598                 TRACE("HSA size too small: %i\n", act_hsa_size);
 599                 return -EINVAL;
 600         }
 601         return 0;
 602 }
 603
 604 static int __init get_mem_info(unsigned long *mem, unsigned long *end)
 605 {
 606         int i;
 607         struct mem_chunk *chunk_array;
 608
 609         chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 610                               GFP_KERNEL);
 611         if (!chunk_array)
 612                 return -ENOMEM;
 613         detect_memory_layout(chunk_array, 0);
 614         for (i = 0; i < MEMORY_CHUNKS; i++) {
 615                 if (chunk_array[i].size == 0)
 616                         break;
 617                 *mem += chunk_array[i].size;
 618                 *end = max(*end, chunk_array[i].addr + chunk_array[i].size);
 619         }
 620         kfree(chunk_array);
 621         return 0;
 622 }
 623
 624 static void __init zcore_header_init(int arch, struct zcore_header *hdr,
 625                                      unsigned long mem_size)
 626 {
 627         u32 prefix;
 628         int i;
 629
 630         if (arch == ARCH_S390X)
 631                 hdr->arch_id = DUMP_ARCH_S390X;
 632         else
 633                 hdr->arch_id = DUMP_ARCH_S390;
 634         hdr->mem_size = mem_size;
 635         hdr->rmem_size = mem_size;
 636         hdr->mem_end = sys_info.mem_size;
 637         hdr->num_pages = mem_size / PAGE_SIZE;
 638         hdr->tod = get_tod_clock();
 639         get_cpu_id(&hdr->cpu_id);
 640         for (i = 0; zfcpdump_save_areas[i]; i++) {
 641                 prefix = zfcpdump_save_areas[i]->pref_reg;
 642                 hdr->real_cpu_cnt++;
 643                 if (!prefix)
 644                         continue;
 645                 hdr->lc_vec[hdr->cpu_cnt] = prefix;
 646                 hdr->cpu_cnt++;
 647         }
 648 }
 649
 650 /*
 651  * Provide IPL parameter information block from either HSA or memory
 652  * for future reipl
 653  */
 654 static int __init zcore_reipl_init(void)
 655 {
 656         struct ipib_info ipib_info;
 657         int rc;
 658
 659         rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
 660         if (rc)
 661                 return rc;
 662         if (ipib_info.ipib == 0)
 663                 return 0;
 664         ipl_block = (void *) __get_free_page(GFP_KERNEL);
 665         if (!ipl_block)
 666                 return -ENOMEM;
 667         if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE)
 668                 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
 669         else
 670                 rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
 671         if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
 672             ipib_info.checksum) {
 673                 TRACE("Checksum does not match\n");
 674                 free_page((unsigned long) ipl_block);
 675                 ipl_block = NULL;
 676         }
 677         return 0;
 678 }
 679
 680 static int __init zcore_init(void)
 681 {
 682         unsigned long mem_size, mem_end;
 683         unsigned char arch;
 684         int rc;
 685
 686         mem_size = mem_end = 0;
 687         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 688                 return -ENODATA;
 689         if (OLDMEM_BASE)
 690                 return -ENODATA;
 691
 692         zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
 693         debug_register_view(zcore_dbf, &debug_sprintf_view);
 694         debug_set_level(zcore_dbf, 6);
 695
 696         TRACE("devno:  %x\n", ipl_info.data.fcp.dev_id.devno);
 697         TRACE("wwpn:   %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
 698         TRACE("lun:    %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
 699
 700         rc = sclp_sdias_init();
 701         if (rc)
 702                 goto fail;
 703
 704         rc = check_sdias();
 705         if (rc)
 706                 goto fail;
 707         hsa_available = 1;
 708
 709         rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
 710         if (rc)
 711                 goto fail;
 712
 713 #ifdef CONFIG_64BIT
 714         if (arch == ARCH_S390) {
 715                 pr_alert("The 64-bit dump tool cannot be used for a "
 716                          "32-bit system\n");
 717                 rc = -EINVAL;
 718                 goto fail;
 719         }
 720 #else /* CONFIG_64BIT */
 721         if (arch == ARCH_S390X) {
 722                 pr_alert("The 32-bit dump tool cannot be used for a "
 723                          "64-bit system\n");
 724                 rc = -EINVAL;
 725                 goto fail;
 726         }
 727 #endif /* CONFIG_64BIT */
 728
 729         rc = get_mem_info(&mem_size, &mem_end);
 730         if (rc)
 731                 goto fail;
 732
 733         rc = sys_info_init(arch, mem_end);
 734         if (rc)
 735                 goto fail;
 736         zcore_header_init(arch, &zcore_header, mem_size);
 737
 738         rc = zcore_reipl_init();
 739         if (rc)
 740                 goto fail;
 741
 742         zcore_dir = debugfs_create_dir("zcore" , NULL);
 743         if (!zcore_dir) {
 744                 rc = -ENOMEM;
 745                 goto fail;
 746         }
 747         zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
 748                                          &zcore_fops);
 749         if (!zcore_file) {
 750                 rc = -ENOMEM;
 751                 goto fail_dir;
 752         }
 753         zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
 754                                                 NULL, &zcore_memmap_fops);
 755         if (!zcore_memmap_file) {
 756                 rc = -ENOMEM;
 757                 goto fail_file;
 758         }
 759         zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
 760                                                 NULL, &zcore_reipl_fops);
 761         if (!zcore_reipl_file) {
 762                 rc = -ENOMEM;
 763                 goto fail_memmap_file;
 764         }
 765         zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
 766                                              NULL, &zcore_hsa_fops);
 767         if (!zcore_hsa_file) {
 768                 rc = -ENOMEM;
 769                 goto fail_reipl_file;
 770         }
 771         return 0;
 772
 773 fail_reipl_file:
 774         debugfs_remove(zcore_reipl_file);
 775 fail_memmap_file:
 776         debugfs_remove(zcore_memmap_file);
 777 fail_file:
 778         debugfs_remove(zcore_file);
 779 fail_dir:
 780         debugfs_remove(zcore_dir);
 781 fail:
 782         diag308(DIAG308_REL_HSA, NULL);
 783         return rc;
 784 }
 785
 786 static void __exit zcore_exit(void)
 787 {
 788         debug_unregister(zcore_dbf);
 789         sclp_sdias_exit();
 790         free_page((unsigned long) ipl_block);
 791         debugfs_remove(zcore_hsa_file);
 792         debugfs_remove(zcore_reipl_file);
 793         debugfs_remove(zcore_memmap_file);
 794         debugfs_remove(zcore_file);
 795         debugfs_remove(zcore_dir);
 796         diag308(DIAG308_REL_HSA, NULL);
 797 }
 798
 799 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
 800 MODULE_DESCRIPTION("zcore module for zfcpdump support");
 801 MODULE_LICENSE("GPL");
 802
 803 subsys_initcall(zcore_init);
 804 module_exit(zcore_exit);