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. 2003,2007
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/miscdevice.h>
17 #include <linux/utsname.h>
18 #include <linux/debugfs.h>
19 #include <asm/ipl.h>
20 #include <asm/sclp.h>
21 #include <asm/setup.h>
22 #include <asm/sigp.h>
23 #include <asm/uaccess.h>
24 #include <asm/debug.h>
25 #include <asm/processor.h>
26 #include <asm/irqflags.h>
27 #include "sclp.h"
28
29 #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
30
31 #define TO_USER 0
32 #define TO_KERNEL 1
33 #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */
34
35 enum arch_id {
36 ARCH_S390 = 0,
37 ARCH_S390X = 1,
38 };
39
40 /* dump system info */
41
42 struct sys_info {
43 enum arch_id arch;
44 unsigned long sa_base;
45 u32 sa_size;
46 int cpu_map[NR_CPUS];
47 unsigned long mem_size;
48 union save_area lc_mask;
49 };
50
51 static struct sys_info sys_info;
52 static struct debug_info *zcore_dbf;
53 static int hsa_available;
54 static struct dentry *zcore_dir;
55 static struct dentry *zcore_file;
56 static struct dentry *zcore_memmap_file;
57
58 /*
59 * Copy memory from HSA to kernel or user memory (not reentrant):
60 *
61 * @dest: Kernel or user buffer where memory should be copied to
62 * @src: Start address within HSA where data should be copied
63 * @count: Size of buffer, which should be copied
64 * @mode: Either TO_KERNEL or TO_USER
65 */
memcpy_hsa(void * dest,unsigned long src,size_t count,int mode)66 static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
67 {
68 int offs, blk_num;
69 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
70
71 if (count == 0)
72 return 0;
73
74 /* copy first block */
75 offs = 0;
76 if ((src % PAGE_SIZE) != 0) {
77 blk_num = src / PAGE_SIZE + 2;
78 if (sclp_sdias_copy(buf, blk_num, 1)) {
79 TRACE("sclp_sdias_copy() failed\n");
80 return -EIO;
81 }
82 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
83 if (mode == TO_USER) {
84 if (copy_to_user((__force __user void*) dest,
85 buf + (src % PAGE_SIZE), offs))
86 return -EFAULT;
87 } else
88 memcpy(dest, buf + (src % PAGE_SIZE), offs);
89 }
90 if (offs == count)
91 goto out;
92
93 /* copy middle */
94 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
95 blk_num = (src + offs) / PAGE_SIZE + 2;
96 if (sclp_sdias_copy(buf, blk_num, 1)) {
97 TRACE("sclp_sdias_copy() failed\n");
98 return -EIO;
99 }
100 if (mode == TO_USER) {
101 if (copy_to_user((__force __user void*) dest + offs,
102 buf, PAGE_SIZE))
103 return -EFAULT;
104 } else
105 memcpy(dest + offs, buf, PAGE_SIZE);
106 }
107 if (offs == count)
108 goto out;
109
110 /* copy last block */
111 blk_num = (src + offs) / PAGE_SIZE + 2;
112 if (sclp_sdias_copy(buf, blk_num, 1)) {
113 TRACE("sclp_sdias_copy() failed\n");
114 return -EIO;
115 }
116 if (mode == TO_USER) {
117 if (copy_to_user((__force __user void*) dest + offs, buf,
118 PAGE_SIZE))
119 return -EFAULT;
120 } else
121 memcpy(dest + offs, buf, count - offs);
122 out:
123 return 0;
124 }
125
memcpy_hsa_user(void __user * dest,unsigned long src,size_t count)126 static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
127 {
128 return memcpy_hsa((void __force *) dest, src, count, TO_USER);
129 }
130
memcpy_hsa_kernel(void * dest,unsigned long src,size_t count)131 static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
132 {
133 return memcpy_hsa(dest, src, count, TO_KERNEL);
134 }
135
memcpy_real(void * dest,unsigned long src,size_t count)136 static int memcpy_real(void *dest, unsigned long src, size_t count)
137 {
138 unsigned long flags;
139 int rc = -EFAULT;
140 register unsigned long _dest asm("2") = (unsigned long) dest;
141 register unsigned long _len1 asm("3") = (unsigned long) count;
142 register unsigned long _src asm("4") = src;
143 register unsigned long _len2 asm("5") = (unsigned long) count;
144
145 if (count == 0)
146 return 0;
147 flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */
148 asm volatile (
149 "0: mvcle %1,%2,0x0\n"
150 "1: jo 0b\n"
151 " lhi %0,0x0\n"
152 "2:\n"
153 EX_TABLE(1b,2b)
154 : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
155 "+d" (_len2), "=m" (*((long*)dest))
156 : "m" (*((long*)src))
157 : "cc", "memory");
158 __raw_local_irq_ssm(flags);
159
160 return rc;
161 }
162
memcpy_real_user(void __user * dest,unsigned long src,size_t count)163 static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
164 {
165 static char buf[4096];
166 int offs = 0, size;
167
168 while (offs < count) {
169 size = min(sizeof(buf), count - offs);
170 if (memcpy_real(buf, src + offs, size))
171 return -EFAULT;
172 if (copy_to_user(dest + offs, buf, size))
173 return -EFAULT;
174 offs += size;
175 }
176 return 0;
177 }
178
179 #ifdef __s390x__
180 /*
181 * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info
182 */
s390x_to_s390_regs(union save_area * out,union save_area * in,int cpu)183 static void __init s390x_to_s390_regs(union save_area *out, union save_area *in,
184 int cpu)
185 {
186 int i;
187
188 for (i = 0; i < 16; i++) {
189 out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff;
190 out->s390.acc_regs[i] = in->s390x.acc_regs[i];
191 out->s390.ctrl_regs[i] =
192 in->s390x.ctrl_regs[i] & 0x00000000ffffffff;
193 }
194 /* locore for 31 bit has only space for fpregs 0,2,4,6 */
195 out->s390.fp_regs[0] = in->s390x.fp_regs[0];
196 out->s390.fp_regs[1] = in->s390x.fp_regs[2];
197 out->s390.fp_regs[2] = in->s390x.fp_regs[4];
198 out->s390.fp_regs[3] = in->s390x.fp_regs[6];
199 memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4);
200 out->s390.psw[1] |= 0x8; /* set bit 12 */
201 memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4);
202 out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */
203 out->s390.pref_reg = in->s390x.pref_reg;
204 out->s390.timer = in->s390x.timer;
205 out->s390.clk_cmp = in->s390x.clk_cmp;
206 }
207
s390x_to_s390_save_areas(void)208 static void __init s390x_to_s390_save_areas(void)
209 {
210 int i = 1;
211 static union save_area tmp;
212
213 while (zfcpdump_save_areas[i]) {
214 s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i);
215 memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp));
216 i++;
217 }
218 }
219
220 #endif /* __s390x__ */
221
init_cpu_info(enum arch_id arch)222 static int __init init_cpu_info(enum arch_id arch)
223 {
224 union save_area *sa;
225
226 /* get info for boot cpu from lowcore, stored in the HSA */
227
228 sa = kmalloc(sizeof(*sa), GFP_KERNEL);
229 if (!sa)
230 return -ENOMEM;
231 if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
232 TRACE("could not copy from HSA\n");
233 kfree(sa);
234 return -EIO;
235 }
236 zfcpdump_save_areas[0] = sa;
237
238 #ifdef __s390x__
239 /* convert s390x regs to s390, if we are dumping an s390 Linux */
240
241 if (arch == ARCH_S390)
242 s390x_to_s390_save_areas();
243 #endif
244
245 return 0;
246 }
247
248 static DEFINE_MUTEX(zcore_mutex);
249
250 #define DUMP_VERSION 0x3
251 #define DUMP_MAGIC 0xa8190173618f23fdULL
252 #define DUMP_ARCH_S390X 2
253 #define DUMP_ARCH_S390 1
254 #define HEADER_SIZE 4096
255
256 /* dump header dumped according to s390 crash dump format */
257
258 struct zcore_header {
259 u64 magic;
260 u32 version;
261 u32 header_size;
262 u32 dump_level;
263 u32 page_size;
264 u64 mem_size;
265 u64 mem_start;
266 u64 mem_end;
267 u32 num_pages;
268 u32 pad1;
269 u64 tod;
270 cpuid_t cpu_id;
271 u32 arch_id;
272 u32 volnr;
273 u32 build_arch;
274 u64 rmem_size;
275 char pad2[4016];
276 } __attribute__((packed,__aligned__(16)));
277
278 static struct zcore_header zcore_header = {
279 .magic = DUMP_MAGIC,
280 .version = DUMP_VERSION,
281 .header_size = 4096,
282 .dump_level = 0,
283 .page_size = PAGE_SIZE,
284 .mem_start = 0,
285 #ifdef __s390x__
286 .build_arch = DUMP_ARCH_S390X,
287 #else
288 .build_arch = DUMP_ARCH_S390,
289 #endif
290 };
291
292 /*
293 * Copy lowcore info to buffer. Use map in order to copy only register parts.
294 *
295 * @buf: User buffer
296 * @sa: Pointer to save area
297 * @sa_off: Offset in save area to copy
298 * @len: Number of bytes to copy
299 */
copy_lc(void __user * buf,void * sa,int sa_off,int len)300 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
301 {
302 int i;
303 char *lc_mask = (char*)&sys_info.lc_mask;
304
305 for (i = 0; i < len; i++) {
306 if (!lc_mask[i + sa_off])
307 continue;
308 if (copy_to_user(buf + i, sa + sa_off + i, 1))
309 return -EFAULT;
310 }
311 return 0;
312 }
313
314 /*
315 * Copy lowcores info to memory, if necessary
316 *
317 * @buf: User buffer
318 * @addr: Start address of buffer in dump memory
319 * @count: Size of buffer
320 */
zcore_add_lc(char __user * buf,unsigned long start,size_t count)321 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
322 {
323 unsigned long end;
324 int i = 0;
325
326 if (count == 0)
327 return 0;
328
329 end = start + count;
330 while (zfcpdump_save_areas[i]) {
331 unsigned long cp_start, cp_end; /* copy range */
332 unsigned long sa_start, sa_end; /* save area range */
333 unsigned long prefix;
334 unsigned long sa_off, len, buf_off;
335
336 if (sys_info.arch == ARCH_S390)
337 prefix = zfcpdump_save_areas[i]->s390.pref_reg;
338 else
339 prefix = zfcpdump_save_areas[i]->s390x.pref_reg;
340
341 sa_start = prefix + sys_info.sa_base;
342 sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
343
344 if ((end < sa_start) || (start > sa_end))
345 goto next;
346 cp_start = max(start, sa_start);
347 cp_end = min(end, sa_end);
348
349 buf_off = cp_start - start;
350 sa_off = cp_start - sa_start;
351 len = cp_end - cp_start;
352
353 TRACE("copy_lc for: %lx\n", start);
354 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
355 return -EFAULT;
356 next:
357 i++;
358 }
359 return 0;
360 }
361
362 /*
363 * Read routine for zcore character device
364 * First 4K are dump header
365 * Next 32MB are HSA Memory
366 * Rest is read from absolute Memory
367 */
zcore_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)368 static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
369 loff_t *ppos)
370 {
371 unsigned long mem_start; /* Start address in memory */
372 size_t mem_offs; /* Offset in dump memory */
373 size_t hdr_count; /* Size of header part of output buffer */
374 size_t size;
375 int rc;
376
377 mutex_lock(&zcore_mutex);
378
379 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
380 rc = -EINVAL;
381 goto fail;
382 }
383
384 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
385
386 /* Copy dump header */
387 if (*ppos < HEADER_SIZE) {
388 size = min(count, (size_t) (HEADER_SIZE - *ppos));
389 if (copy_to_user(buf, &zcore_header + *ppos, size)) {
390 rc = -EFAULT;
391 goto fail;
392 }
393 hdr_count = size;
394 mem_start = 0;
395 } else {
396 hdr_count = 0;
397 mem_start = *ppos - HEADER_SIZE;
398 }
399
400 mem_offs = 0;
401
402 /* Copy from HSA data */
403 if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
404 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
405 - mem_start));
406 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
407 if (rc)
408 goto fail;
409
410 mem_offs += size;
411 }
412
413 /* Copy from real mem */
414 size = count - mem_offs - hdr_count;
415 rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
416 size);
417 if (rc)
418 goto fail;
419
420 /*
421 * Since s390 dump analysis tools like lcrash or crash
422 * expect register sets in the prefix pages of the cpus,
423 * we copy them into the read buffer, if necessary.
424 * buf + hdr_count: Start of memory part of output buffer
425 * mem_start: Start memory address to copy from
426 * count - hdr_count: Size of memory area to copy
427 */
428 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
429 rc = -EFAULT;
430 goto fail;
431 }
432 *ppos += count;
433 fail:
434 mutex_unlock(&zcore_mutex);
435 return (rc < 0) ? rc : count;
436 }
437
zcore_open(struct inode * inode,struct file * filp)438 static int zcore_open(struct inode *inode, struct file *filp)
439 {
440 if (!hsa_available)
441 return -ENODATA;
442 else
443 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
444 }
445
zcore_release(struct inode * inode,struct file * filep)446 static int zcore_release(struct inode *inode, struct file *filep)
447 {
448 diag308(DIAG308_REL_HSA, NULL);
449 hsa_available = 0;
450 return 0;
451 }
452
zcore_lseek(struct file * file,loff_t offset,int orig)453 static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
454 {
455 loff_t rc;
456
457 mutex_lock(&zcore_mutex);
458 switch (orig) {
459 case 0:
460 file->f_pos = offset;
461 rc = file->f_pos;
462 break;
463 case 1:
464 file->f_pos += offset;
465 rc = file->f_pos;
466 break;
467 default:
468 rc = -EINVAL;
469 }
470 mutex_unlock(&zcore_mutex);
471 return rc;
472 }
473
474 static const struct file_operations zcore_fops = {
475 .owner = THIS_MODULE,
476 .llseek = zcore_lseek,
477 .read = zcore_read,
478 .open = zcore_open,
479 .release = zcore_release,
480 };
481
zcore_memmap_read(struct file * filp,char __user * buf,size_t count,loff_t * ppos)482 static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
483 size_t count, loff_t *ppos)
484 {
485 return simple_read_from_buffer(buf, count, ppos, filp->private_data,
486 MEMORY_CHUNKS * CHUNK_INFO_SIZE);
487 }
488
zcore_memmap_open(struct inode * inode,struct file * filp)489 static int zcore_memmap_open(struct inode *inode, struct file *filp)
490 {
491 int i;
492 char *buf;
493 struct mem_chunk *chunk_array;
494
495 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
496 GFP_KERNEL);
497 if (!chunk_array)
498 return -ENOMEM;
499 detect_memory_layout(chunk_array);
500 buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
501 if (!buf) {
502 kfree(chunk_array);
503 return -ENOMEM;
504 }
505 for (i = 0; i < MEMORY_CHUNKS; i++) {
506 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
507 (unsigned long long) chunk_array[i].addr,
508 (unsigned long long) chunk_array[i].size);
509 if (chunk_array[i].size == 0)
510 break;
511 }
512 kfree(chunk_array);
513 filp->private_data = buf;
514 return 0;
515 }
516
zcore_memmap_release(struct inode * inode,struct file * filp)517 static int zcore_memmap_release(struct inode *inode, struct file *filp)
518 {
519 kfree(filp->private_data);
520 return 0;
521 }
522
523 static const struct file_operations zcore_memmap_fops = {
524 .owner = THIS_MODULE,
525 .read = zcore_memmap_read,
526 .open = zcore_memmap_open,
527 .release = zcore_memmap_release,
528 };
529
530
set_s390_lc_mask(union save_area * map)531 static void __init set_s390_lc_mask(union save_area *map)
532 {
533 memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save));
534 memset(&map->s390.timer, 0xff, sizeof(map->s390.timer));
535 memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp));
536 memset(&map->s390.psw, 0xff, sizeof(map->s390.psw));
537 memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg));
538 memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs));
539 memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs));
540 memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs));
541 memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs));
542 }
543
set_s390x_lc_mask(union save_area * map)544 static void __init set_s390x_lc_mask(union save_area *map)
545 {
546 memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs));
547 memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs));
548 memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw));
549 memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg));
550 memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg));
551 memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg));
552 memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer));
553 memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp));
554 memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs));
555 memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs));
556 }
557
558 /*
559 * Initialize dump globals for a given architecture
560 */
sys_info_init(enum arch_id arch)561 static int __init sys_info_init(enum arch_id arch)
562 {
563 int rc;
564
565 switch (arch) {
566 case ARCH_S390X:
567 pr_alert("DETECTED 'S390X (64 bit) OS'\n");
568 sys_info.sa_base = SAVE_AREA_BASE_S390X;
569 sys_info.sa_size = sizeof(struct save_area_s390x);
570 set_s390x_lc_mask(&sys_info.lc_mask);
571 break;
572 case ARCH_S390:
573 pr_alert("DETECTED 'S390 (32 bit) OS'\n");
574 sys_info.sa_base = SAVE_AREA_BASE_S390;
575 sys_info.sa_size = sizeof(struct save_area_s390);
576 set_s390_lc_mask(&sys_info.lc_mask);
577 break;
578 default:
579 pr_alert("0x%x is an unknown architecture.\n",arch);
580 return -EINVAL;
581 }
582 sys_info.arch = arch;
583 rc = init_cpu_info(arch);
584 if (rc)
585 return rc;
586 sys_info.mem_size = real_memory_size;
587
588 return 0;
589 }
590
check_sdias(void)591 static int __init check_sdias(void)
592 {
593 int rc, act_hsa_size;
594
595 rc = sclp_sdias_blk_count();
596 if (rc < 0) {
597 TRACE("Could not determine HSA size\n");
598 return rc;
599 }
600 act_hsa_size = (rc - 1) * PAGE_SIZE;
601 if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
602 TRACE("HSA size too small: %i\n", act_hsa_size);
603 return -EINVAL;
604 }
605 return 0;
606 }
607
get_mem_size(unsigned long * mem)608 static int __init get_mem_size(unsigned long *mem)
609 {
610 int i;
611 struct mem_chunk *chunk_array;
612
613 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
614 GFP_KERNEL);
615 if (!chunk_array)
616 return -ENOMEM;
617 detect_memory_layout(chunk_array);
618 for (i = 0; i < MEMORY_CHUNKS; i++) {
619 if (chunk_array[i].size == 0)
620 break;
621 *mem += chunk_array[i].size;
622 }
623 kfree(chunk_array);
624 return 0;
625 }
626
zcore_header_init(int arch,struct zcore_header * hdr)627 static int __init zcore_header_init(int arch, struct zcore_header *hdr)
628 {
629 int rc;
630 unsigned long memory = 0;
631
632 if (arch == ARCH_S390X)
633 hdr->arch_id = DUMP_ARCH_S390X;
634 else
635 hdr->arch_id = DUMP_ARCH_S390;
636 rc = get_mem_size(&memory);
637 if (rc)
638 return rc;
639 hdr->mem_size = memory;
640 hdr->rmem_size = memory;
641 hdr->mem_end = sys_info.mem_size;
642 hdr->num_pages = memory / PAGE_SIZE;
643 hdr->tod = get_clock();
644 get_cpu_id(&hdr->cpu_id);
645 return 0;
646 }
647
zcore_init(void)648 static int __init zcore_init(void)
649 {
650 unsigned char arch;
651 int rc;
652
653 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
654 return -ENODATA;
655
656 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
657 debug_register_view(zcore_dbf, &debug_sprintf_view);
658 debug_set_level(zcore_dbf, 6);
659
660 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
661 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
662 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
663
664 rc = sclp_sdias_init();
665 if (rc)
666 goto fail;
667
668 rc = check_sdias();
669 if (rc)
670 goto fail;
671
672 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
673 if (rc)
674 goto fail;
675
676 #ifndef __s390x__
677 if (arch == ARCH_S390X) {
678 pr_alert("The 32-bit dump tool cannot be used for a "
679 "64-bit system\n");
680 rc = -EINVAL;
681 goto fail;
682 }
683 #endif
684
685 rc = sys_info_init(arch);
686 if (rc)
687 goto fail;
688
689 rc = zcore_header_init(arch, &zcore_header);
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 hsa_available = 1;
711 return 0;
712
713 fail_file:
714 debugfs_remove(zcore_file);
715 fail_dir:
716 debugfs_remove(zcore_dir);
717 fail:
718 diag308(DIAG308_REL_HSA, NULL);
719 return rc;
720 }
721
zcore_exit(void)722 static void __exit zcore_exit(void)
723 {
724 debug_unregister(zcore_dbf);
725 sclp_sdias_exit();
726 diag308(DIAG308_REL_HSA, NULL);
727 }
728
729 MODULE_AUTHOR("Copyright IBM Corp. 2003,2007");
730 MODULE_DESCRIPTION("zcore module for zfcpdump support");
731 MODULE_LICENSE("GPL");
732
733 subsys_initcall(zcore_init);
734 module_exit(zcore_exit);
735