linux/drivers/s390/char/zcore.c
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   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 <asm/switch_to.h>
  30#include "sclp.h"
  31
  32#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
  33
  34#define TO_USER         1
  35#define TO_KERNEL       0
  36#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */
  37
  38enum arch_id {
  39        ARCH_S390       = 0,
  40        ARCH_S390X      = 1,
  41};
  42
  43/* dump system info */
  44
  45struct 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
  54struct ipib_info {
  55        unsigned long   ipib;
  56        u32             checksum;
  57}  __attribute__((packed));
  58
  59static struct sys_info sys_info;
  60static struct debug_info *zcore_dbf;
  61static int hsa_available;
  62static struct dentry *zcore_dir;
  63static struct dentry *zcore_file;
  64static struct dentry *zcore_memmap_file;
  65static struct dentry *zcore_reipl_file;
  66static struct dentry *zcore_hsa_file;
  67static struct ipl_parameter_block *ipl_block;
  68
  69/*
  70 * Copy memory from HSA to kernel or user memory (not reentrant):
  71 *
  72 * @dest:  Kernel or user buffer where memory should be copied to
  73 * @src:   Start address within HSA where data should be copied
  74 * @count: Size of buffer, which should be copied
  75 * @mode:  Either TO_KERNEL or TO_USER
  76 */
  77int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
  78{
  79        int offs, blk_num;
  80        static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
  81
  82        if (!hsa_available)
  83                return -ENODATA;
  84        if (count == 0)
  85                return 0;
  86
  87        /* copy first block */
  88        offs = 0;
  89        if ((src % PAGE_SIZE) != 0) {
  90                blk_num = src / PAGE_SIZE + 2;
  91                if (sclp_sdias_copy(buf, blk_num, 1)) {
  92                        TRACE("sclp_sdias_copy() failed\n");
  93                        return -EIO;
  94                }
  95                offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
  96                if (mode == TO_USER) {
  97                        if (copy_to_user((__force __user void*) dest,
  98                                         buf + (src % PAGE_SIZE), offs))
  99                                return -EFAULT;
 100                } else
 101                        memcpy(dest, buf + (src % PAGE_SIZE), offs);
 102        }
 103        if (offs == count)
 104                goto out;
 105
 106        /* copy middle */
 107        for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
 108                blk_num = (src + offs) / PAGE_SIZE + 2;
 109                if (sclp_sdias_copy(buf, blk_num, 1)) {
 110                        TRACE("sclp_sdias_copy() failed\n");
 111                        return -EIO;
 112                }
 113                if (mode == TO_USER) {
 114                        if (copy_to_user((__force __user void*) dest + offs,
 115                                         buf, PAGE_SIZE))
 116                                return -EFAULT;
 117                } else
 118                        memcpy(dest + offs, buf, PAGE_SIZE);
 119        }
 120        if (offs == count)
 121                goto out;
 122
 123        /* copy last block */
 124        blk_num = (src + offs) / PAGE_SIZE + 2;
 125        if (sclp_sdias_copy(buf, blk_num, 1)) {
 126                TRACE("sclp_sdias_copy() failed\n");
 127                return -EIO;
 128        }
 129        if (mode == TO_USER) {
 130                if (copy_to_user((__force __user void*) dest + offs, buf,
 131                                 count - offs))
 132                        return -EFAULT;
 133        } else
 134                memcpy(dest + offs, buf, count - offs);
 135out:
 136        return 0;
 137}
 138
 139static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
 140{
 141        return memcpy_hsa((void __force *) dest, src, count, TO_USER);
 142}
 143
 144static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
 145{
 146        return memcpy_hsa(dest, src, count, TO_KERNEL);
 147}
 148
 149static int __init init_cpu_info(enum arch_id arch)
 150{
 151        struct save_area_ext *sa_ext;
 152
 153        /* get info for boot cpu from lowcore, stored in the HSA */
 154
 155        sa_ext = dump_save_area_create(0);
 156        if (!sa_ext)
 157                return -ENOMEM;
 158        if (memcpy_hsa_kernel(&sa_ext->sa, sys_info.sa_base,
 159                              sys_info.sa_size) < 0) {
 160                TRACE("could not copy from HSA\n");
 161                kfree(sa_ext);
 162                return -EIO;
 163        }
 164        if (MACHINE_HAS_VX)
 165                save_vx_regs_safe(sa_ext->vx_regs);
 166        return 0;
 167}
 168
 169static DEFINE_MUTEX(zcore_mutex);
 170
 171#define DUMP_VERSION    0x5
 172#define DUMP_MAGIC      0xa8190173618f23fdULL
 173#define DUMP_ARCH_S390X 2
 174#define DUMP_ARCH_S390  1
 175#define HEADER_SIZE     4096
 176
 177/* dump header dumped according to s390 crash dump format */
 178
 179struct zcore_header {
 180        u64 magic;
 181        u32 version;
 182        u32 header_size;
 183        u32 dump_level;
 184        u32 page_size;
 185        u64 mem_size;
 186        u64 mem_start;
 187        u64 mem_end;
 188        u32 num_pages;
 189        u32 pad1;
 190        u64 tod;
 191        struct cpuid cpu_id;
 192        u32 arch_id;
 193        u32 volnr;
 194        u32 build_arch;
 195        u64 rmem_size;
 196        u8 mvdump;
 197        u16 cpu_cnt;
 198        u16 real_cpu_cnt;
 199        u8 end_pad1[0x200-0x061];
 200        u64 mvdump_sign;
 201        u64 mvdump_zipl_time;
 202        u8 end_pad2[0x800-0x210];
 203        u32 lc_vec[512];
 204} __attribute__((packed,__aligned__(16)));
 205
 206static struct zcore_header zcore_header = {
 207        .magic          = DUMP_MAGIC,
 208        .version        = DUMP_VERSION,
 209        .header_size    = 4096,
 210        .dump_level     = 0,
 211        .page_size      = PAGE_SIZE,
 212        .mem_start      = 0,
 213#ifdef CONFIG_64BIT
 214        .build_arch     = DUMP_ARCH_S390X,
 215#else
 216        .build_arch     = DUMP_ARCH_S390,
 217#endif
 218};
 219
 220/*
 221 * Copy lowcore info to buffer. Use map in order to copy only register parts.
 222 *
 223 * @buf:    User buffer
 224 * @sa:     Pointer to save area
 225 * @sa_off: Offset in save area to copy
 226 * @len:    Number of bytes to copy
 227 */
 228static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
 229{
 230        int i;
 231        char *lc_mask = (char*)&sys_info.lc_mask;
 232
 233        for (i = 0; i < len; i++) {
 234                if (!lc_mask[i + sa_off])
 235                        continue;
 236                if (copy_to_user(buf + i, sa + sa_off + i, 1))
 237                        return -EFAULT;
 238        }
 239        return 0;
 240}
 241
 242/*
 243 * Copy lowcores info to memory, if necessary
 244 *
 245 * @buf:   User buffer
 246 * @addr:  Start address of buffer in dump memory
 247 * @count: Size of buffer
 248 */
 249static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
 250{
 251        unsigned long end;
 252        int i;
 253
 254        if (count == 0)
 255                return 0;
 256
 257        end = start + count;
 258        for (i = 0; i < dump_save_areas.count; i++) {
 259                unsigned long cp_start, cp_end; /* copy range */
 260                unsigned long sa_start, sa_end; /* save area range */
 261                unsigned long prefix;
 262                unsigned long sa_off, len, buf_off;
 263                struct save_area *save_area = &dump_save_areas.areas[i]->sa;
 264
 265                prefix = save_area->pref_reg;
 266                sa_start = prefix + sys_info.sa_base;
 267                sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
 268
 269                if ((end < sa_start) || (start > sa_end))
 270                        continue;
 271                cp_start = max(start, sa_start);
 272                cp_end = min(end, sa_end);
 273
 274                buf_off = cp_start - start;
 275                sa_off = cp_start - sa_start;
 276                len = cp_end - cp_start;
 277
 278                TRACE("copy_lc for: %lx\n", start);
 279                if (copy_lc(buf + buf_off, save_area, sa_off, len))
 280                        return -EFAULT;
 281        }
 282        return 0;
 283}
 284
 285/*
 286 * Release the HSA
 287 */
 288static void release_hsa(void)
 289{
 290        diag308(DIAG308_REL_HSA, NULL);
 291        hsa_available = 0;
 292}
 293
 294/*
 295 * Read routine for zcore character device
 296 * First 4K are dump header
 297 * Next 32MB are HSA Memory
 298 * Rest is read from absolute Memory
 299 */
 300static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
 301                          loff_t *ppos)
 302{
 303        unsigned long mem_start; /* Start address in memory */
 304        size_t mem_offs;         /* Offset in dump memory */
 305        size_t hdr_count;        /* Size of header part of output buffer */
 306        size_t size;
 307        int rc;
 308
 309        mutex_lock(&zcore_mutex);
 310
 311        if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
 312                rc = -EINVAL;
 313                goto fail;
 314        }
 315
 316        count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
 317
 318        /* Copy dump header */
 319        if (*ppos < HEADER_SIZE) {
 320                size = min(count, (size_t) (HEADER_SIZE - *ppos));
 321                if (copy_to_user(buf, &zcore_header + *ppos, size)) {
 322                        rc = -EFAULT;
 323                        goto fail;
 324                }
 325                hdr_count = size;
 326                mem_start = 0;
 327        } else {
 328                hdr_count = 0;
 329                mem_start = *ppos - HEADER_SIZE;
 330        }
 331
 332        mem_offs = 0;
 333
 334        /* Copy from HSA data */
 335        if (*ppos < sclp_get_hsa_size() + HEADER_SIZE) {
 336                size = min((count - hdr_count),
 337                           (size_t) (sclp_get_hsa_size() - mem_start));
 338                rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
 339                if (rc)
 340                        goto fail;
 341
 342                mem_offs += size;
 343        }
 344
 345        /* Copy from real mem */
 346        size = count - mem_offs - hdr_count;
 347        rc = copy_to_user_real(buf + hdr_count + mem_offs,
 348                               (void *) mem_start + mem_offs, size);
 349        if (rc)
 350                goto fail;
 351
 352        /*
 353         * Since s390 dump analysis tools like lcrash or crash
 354         * expect register sets in the prefix pages of the cpus,
 355         * we copy them into the read buffer, if necessary.
 356         * buf + hdr_count: Start of memory part of output buffer
 357         * mem_start: Start memory address to copy from
 358         * count - hdr_count: Size of memory area to copy
 359         */
 360        if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
 361                rc = -EFAULT;
 362                goto fail;
 363        }
 364        *ppos += count;
 365fail:
 366        mutex_unlock(&zcore_mutex);
 367        return (rc < 0) ? rc : count;
 368}
 369
 370static int zcore_open(struct inode *inode, struct file *filp)
 371{
 372        if (!hsa_available)
 373                return -ENODATA;
 374        else
 375                return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
 376}
 377
 378static int zcore_release(struct inode *inode, struct file *filep)
 379{
 380        if (hsa_available)
 381                release_hsa();
 382        return 0;
 383}
 384
 385static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
 386{
 387        loff_t rc;
 388
 389        mutex_lock(&zcore_mutex);
 390        rc = no_seek_end_llseek(file, offset, orig);
 391        mutex_unlock(&zcore_mutex);
 392        return rc;
 393}
 394
 395static const struct file_operations zcore_fops = {
 396        .owner          = THIS_MODULE,
 397        .llseek         = zcore_lseek,
 398        .read           = zcore_read,
 399        .open           = zcore_open,
 400        .release        = zcore_release,
 401};
 402
 403static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
 404                                 size_t count, loff_t *ppos)
 405{
 406        return simple_read_from_buffer(buf, count, ppos, filp->private_data,
 407                                       MEMORY_CHUNKS * CHUNK_INFO_SIZE);
 408}
 409
 410static int zcore_memmap_open(struct inode *inode, struct file *filp)
 411{
 412        int i;
 413        char *buf;
 414        struct mem_chunk *chunk_array;
 415
 416        chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 417                              GFP_KERNEL);
 418        if (!chunk_array)
 419                return -ENOMEM;
 420        detect_memory_layout(chunk_array, 0);
 421        buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
 422        if (!buf) {
 423                kfree(chunk_array);
 424                return -ENOMEM;
 425        }
 426        for (i = 0; i < MEMORY_CHUNKS; i++) {
 427                sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
 428                        (unsigned long long) chunk_array[i].addr,
 429                        (unsigned long long) chunk_array[i].size);
 430                if (chunk_array[i].size == 0)
 431                        break;
 432        }
 433        kfree(chunk_array);
 434        filp->private_data = buf;
 435        return nonseekable_open(inode, filp);
 436}
 437
 438static int zcore_memmap_release(struct inode *inode, struct file *filp)
 439{
 440        kfree(filp->private_data);
 441        return 0;
 442}
 443
 444static 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
 452static 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
 462static int zcore_reipl_open(struct inode *inode, struct file *filp)
 463{
 464        return nonseekable_open(inode, filp);
 465}
 466
 467static int zcore_reipl_release(struct inode *inode, struct file *filp)
 468{
 469        return 0;
 470}
 471
 472static 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
 480static 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
 492static 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
 507static 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
 517static 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
 532static 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 */
 551static 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
 578static 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
 587static int __init get_mem_info(unsigned long *mem, unsigned long *end)
 588{
 589        int i;
 590        struct mem_chunk *chunk_array;
 591
 592        chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
 593                              GFP_KERNEL);
 594        if (!chunk_array)
 595                return -ENOMEM;
 596        detect_memory_layout(chunk_array, 0);
 597        for (i = 0; i < MEMORY_CHUNKS; i++) {
 598                if (chunk_array[i].size == 0)
 599                        break;
 600                *mem += chunk_array[i].size;
 601                *end = max(*end, chunk_array[i].addr + chunk_array[i].size);
 602        }
 603        kfree(chunk_array);
 604        return 0;
 605}
 606
 607static void __init zcore_header_init(int arch, struct zcore_header *hdr,
 608                                     unsigned long mem_size)
 609{
 610        u32 prefix;
 611        int i;
 612
 613        if (arch == ARCH_S390X)
 614                hdr->arch_id = DUMP_ARCH_S390X;
 615        else
 616                hdr->arch_id = DUMP_ARCH_S390;
 617        hdr->mem_size = mem_size;
 618        hdr->rmem_size = mem_size;
 619        hdr->mem_end = sys_info.mem_size;
 620        hdr->num_pages = mem_size / PAGE_SIZE;
 621        hdr->tod = get_tod_clock();
 622        get_cpu_id(&hdr->cpu_id);
 623        for (i = 0; i < dump_save_areas.count; i++) {
 624                prefix = dump_save_areas.areas[i]->sa.pref_reg;
 625                hdr->real_cpu_cnt++;
 626                if (!prefix)
 627                        continue;
 628                hdr->lc_vec[hdr->cpu_cnt] = prefix;
 629                hdr->cpu_cnt++;
 630        }
 631}
 632
 633/*
 634 * Provide IPL parameter information block from either HSA or memory
 635 * for future reipl
 636 */
 637static int __init zcore_reipl_init(void)
 638{
 639        struct ipib_info ipib_info;
 640        int rc;
 641
 642        rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
 643        if (rc)
 644                return rc;
 645        if (ipib_info.ipib == 0)
 646                return 0;
 647        ipl_block = (void *) __get_free_page(GFP_KERNEL);
 648        if (!ipl_block)
 649                return -ENOMEM;
 650        if (ipib_info.ipib < sclp_get_hsa_size())
 651                rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
 652        else
 653                rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
 654        if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
 655            ipib_info.checksum) {
 656                TRACE("Checksum does not match\n");
 657                free_page((unsigned long) ipl_block);
 658                ipl_block = NULL;
 659        }
 660        return 0;
 661}
 662
 663static int __init zcore_init(void)
 664{
 665        unsigned long mem_size, mem_end;
 666        unsigned char arch;
 667        int rc;
 668
 669        mem_size = mem_end = 0;
 670        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 671                return -ENODATA;
 672        if (OLDMEM_BASE)
 673                return -ENODATA;
 674
 675        zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
 676        debug_register_view(zcore_dbf, &debug_sprintf_view);
 677        debug_set_level(zcore_dbf, 6);
 678
 679        TRACE("devno:  %x\n", ipl_info.data.fcp.dev_id.devno);
 680        TRACE("wwpn:   %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
 681        TRACE("lun:    %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
 682
 683        rc = sclp_sdias_init();
 684        if (rc)
 685                goto fail;
 686
 687        rc = check_sdias();
 688        if (rc)
 689                goto fail;
 690        hsa_available = 1;
 691
 692        rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
 693        if (rc)
 694                goto fail;
 695
 696#ifdef CONFIG_64BIT
 697        if (arch == ARCH_S390) {
 698                pr_alert("The 64-bit dump tool cannot be used for a "
 699                         "32-bit system\n");
 700                rc = -EINVAL;
 701                goto fail;
 702        }
 703#else /* CONFIG_64BIT */
 704        if (arch == ARCH_S390X) {
 705                pr_alert("The 32-bit dump tool cannot be used for a "
 706                         "64-bit system\n");
 707                rc = -EINVAL;
 708                goto fail;
 709        }
 710#endif /* CONFIG_64BIT */
 711
 712        rc = get_mem_info(&mem_size, &mem_end);
 713        if (rc)
 714                goto fail;
 715
 716        rc = sys_info_init(arch, mem_end);
 717        if (rc)
 718                goto fail;
 719        zcore_header_init(arch, &zcore_header, mem_size);
 720
 721        rc = zcore_reipl_init();
 722        if (rc)
 723                goto fail;
 724
 725        zcore_dir = debugfs_create_dir("zcore" , NULL);
 726        if (!zcore_dir) {
 727                rc = -ENOMEM;
 728                goto fail;
 729        }
 730        zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
 731                                         &zcore_fops);
 732        if (!zcore_file) {
 733                rc = -ENOMEM;
 734                goto fail_dir;
 735        }
 736        zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
 737                                                NULL, &zcore_memmap_fops);
 738        if (!zcore_memmap_file) {
 739                rc = -ENOMEM;
 740                goto fail_file;
 741        }
 742        zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
 743                                                NULL, &zcore_reipl_fops);
 744        if (!zcore_reipl_file) {
 745                rc = -ENOMEM;
 746                goto fail_memmap_file;
 747        }
 748        zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
 749                                             NULL, &zcore_hsa_fops);
 750        if (!zcore_hsa_file) {
 751                rc = -ENOMEM;
 752                goto fail_reipl_file;
 753        }
 754        return 0;
 755
 756fail_reipl_file:
 757        debugfs_remove(zcore_reipl_file);
 758fail_memmap_file:
 759        debugfs_remove(zcore_memmap_file);
 760fail_file:
 761        debugfs_remove(zcore_file);
 762fail_dir:
 763        debugfs_remove(zcore_dir);
 764fail:
 765        diag308(DIAG308_REL_HSA, NULL);
 766        return rc;
 767}
 768
 769static void __exit zcore_exit(void)
 770{
 771        debug_unregister(zcore_dbf);
 772        sclp_sdias_exit();
 773        free_page((unsigned long) ipl_block);
 774        debugfs_remove(zcore_hsa_file);
 775        debugfs_remove(zcore_reipl_file);
 776        debugfs_remove(zcore_memmap_file);
 777        debugfs_remove(zcore_file);
 778        debugfs_remove(zcore_dir);
 779        diag308(DIAG308_REL_HSA, NULL);
 780}
 781
 782MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
 783MODULE_DESCRIPTION("zcore module for zfcpdump support");
 784MODULE_LICENSE("GPL");
 785
 786subsys_initcall(zcore_init);
 787module_exit(zcore_exit);
 788