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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / drivers / s390 / char / zcore.c
blob3d8e4d63f51418c876f9918e0be77be628d2afb3
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 = dump_save_area_create(0);
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 return 0;
163 }
164
165 static DEFINE_MUTEX(zcore_mutex);
166
167 #define DUMP_VERSION 0x5
168 #define DUMP_MAGIC 0xa8190173618f23fdULL
169 #define DUMP_ARCH_S390X 2
170 #define DUMP_ARCH_S390 1
171 #define HEADER_SIZE 4096
172
173 /* dump header dumped according to s390 crash dump format */
174
175 struct zcore_header {
176 u64 magic;
177 u32 version;
178 u32 header_size;
179 u32 dump_level;
180 u32 page_size;
181 u64 mem_size;
182 u64 mem_start;
183 u64 mem_end;
184 u32 num_pages;
185 u32 pad1;
186 u64 tod;
187 struct cpuid cpu_id;
188 u32 arch_id;
189 u32 volnr;
190 u32 build_arch;
191 u64 rmem_size;
192 u8 mvdump;
193 u16 cpu_cnt;
194 u16 real_cpu_cnt;
195 u8 end_pad1[0x200-0x061];
196 u64 mvdump_sign;
197 u64 mvdump_zipl_time;
198 u8 end_pad2[0x800-0x210];
199 u32 lc_vec[512];
200 } __attribute__((packed,__aligned__(16)));
201
202 static struct zcore_header zcore_header = {
203 .magic = DUMP_MAGIC,
204 .version = DUMP_VERSION,
205 .header_size = 4096,
206 .dump_level = 0,
207 .page_size = PAGE_SIZE,
208 .mem_start = 0,
209 #ifdef CONFIG_64BIT
210 .build_arch = DUMP_ARCH_S390X,
211 #else
212 .build_arch = DUMP_ARCH_S390,
213 #endif
214 };
215
216 /*
217 * Copy lowcore info to buffer. Use map in order to copy only register parts.
218 *
219 * @buf: User buffer
220 * @sa: Pointer to save area
221 * @sa_off: Offset in save area to copy
222 * @len: Number of bytes to copy
223 */
224 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
225 {
226 int i;
227 char *lc_mask = (char*)&sys_info.lc_mask;
228
229 for (i = 0; i < len; i++) {
230 if (!lc_mask[i + sa_off])
231 continue;
232 if (copy_to_user(buf + i, sa + sa_off + i, 1))
233 return -EFAULT;
234 }
235 return 0;
236 }
237
238 /*
239 * Copy lowcores info to memory, if necessary
240 *
241 * @buf: User buffer
242 * @addr: Start address of buffer in dump memory
243 * @count: Size of buffer
244 */
245 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
246 {
247 unsigned long end;
248 int i;
249
250 if (count == 0)
251 return 0;
252
253 end = start + count;
254 for (i = 0; i < dump_save_areas.count; i++) {
255 unsigned long cp_start, cp_end; /* copy range */
256 unsigned long sa_start, sa_end; /* save area range */
257 unsigned long prefix;
258 unsigned long sa_off, len, buf_off;
259 struct save_area *save_area = dump_save_areas.areas[i];
260
261 prefix = save_area->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 continue;
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, save_area, sa_off, len))
276 return -EFAULT;
277 }
278 return 0;
279 }
280
281 /*
282 * Release the HSA
283 */
284 static void release_hsa(void)
285 {
286 diag308(DIAG308_REL_HSA, NULL);
287 hsa_available = 0;
288 }
289
290 /*
291 * Read routine for zcore character device
292 * First 4K are dump header
293 * Next 32MB are HSA Memory
294 * Rest is read from absolute Memory
295 */
296 static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
297 loff_t *ppos)
298 {
299 unsigned long mem_start; /* Start address in memory */
300 size_t mem_offs; /* Offset in dump memory */
301 size_t hdr_count; /* Size of header part of output buffer */
302 size_t size;
303 int rc;
304
305 mutex_lock(&zcore_mutex);
306
307 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
308 rc = -EINVAL;
309 goto fail;
310 }
311
312 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
313
314 /* Copy dump header */
315 if (*ppos < HEADER_SIZE) {
316 size = min(count, (size_t) (HEADER_SIZE - *ppos));
317 if (copy_to_user(buf, &zcore_header + *ppos, size)) {
318 rc = -EFAULT;
319 goto fail;
320 }
321 hdr_count = size;
322 mem_start = 0;
323 } else {
324 hdr_count = 0;
325 mem_start = *ppos - HEADER_SIZE;
326 }
327
328 mem_offs = 0;
329
330 /* Copy from HSA data */
331 if (*ppos < sclp_get_hsa_size() + HEADER_SIZE) {
332 size = min((count - hdr_count),
333 (size_t) (sclp_get_hsa_size() - mem_start));
334 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
335 if (rc)
336 goto fail;
337
338 mem_offs += size;
339 }
340
341 /* Copy from real mem */
342 size = count - mem_offs - hdr_count;
343 rc = copy_to_user_real(buf + hdr_count + mem_offs,
344 (void *) mem_start + mem_offs, size);
345 if (rc)
346 goto fail;
347
348 /*
349 * Since s390 dump analysis tools like lcrash or crash
350 * expect register sets in the prefix pages of the cpus,
351 * we copy them into the read buffer, if necessary.
352 * buf + hdr_count: Start of memory part of output buffer
353 * mem_start: Start memory address to copy from
354 * count - hdr_count: Size of memory area to copy
355 */
356 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
357 rc = -EFAULT;
358 goto fail;
359 }
360 *ppos += count;
361 fail:
362 mutex_unlock(&zcore_mutex);
363 return (rc < 0) ? rc : count;
364 }
365
366 static int zcore_open(struct inode *inode, struct file *filp)
367 {
368 if (!hsa_available)
369 return -ENODATA;
370 else
371 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
372 }
373
374 static int zcore_release(struct inode *inode, struct file *filep)
375 {
376 if (hsa_available)
377 release_hsa();
378 return 0;
379 }
380
381 static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
382 {
383 loff_t rc;
384
385 mutex_lock(&zcore_mutex);
386 switch (orig) {
387 case 0:
388 file->f_pos = offset;
389 rc = file->f_pos;
390 break;
391 case 1:
392 file->f_pos += offset;
393 rc = file->f_pos;
394 break;
395 default:
396 rc = -EINVAL;
397 }
398 mutex_unlock(&zcore_mutex);
399 return rc;
400 }
401
402 static const struct file_operations zcore_fops = {
403 .owner = THIS_MODULE,
404 .llseek = zcore_lseek,
405 .read = zcore_read,
406 .open = zcore_open,
407 .release = zcore_release,
408 };
409
410 static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
411 size_t count, loff_t *ppos)
412 {
413 return simple_read_from_buffer(buf, count, ppos, filp->private_data,
414 MEMORY_CHUNKS * CHUNK_INFO_SIZE);
415 }
416
417 static int zcore_memmap_open(struct inode *inode, struct file *filp)
418 {
419 int i;
420 char *buf;
421 struct mem_chunk *chunk_array;
422
423 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
424 GFP_KERNEL);
425 if (!chunk_array)
426 return -ENOMEM;
427 detect_memory_layout(chunk_array, 0);
428 buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
429 if (!buf) {
430 kfree(chunk_array);
431 return -ENOMEM;
432 }
433 for (i = 0; i < MEMORY_CHUNKS; i++) {
434 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
435 (unsigned long long) chunk_array[i].addr,
436 (unsigned long long) chunk_array[i].size);
437 if (chunk_array[i].size == 0)
438 break;
439 }
440 kfree(chunk_array);
441 filp->private_data = buf;
442 return nonseekable_open(inode, filp);
443 }
444
445 static int zcore_memmap_release(struct inode *inode, struct file *filp)
446 {
447 kfree(filp->private_data);
448 return 0;
449 }
450
451 static const struct file_operations zcore_memmap_fops = {
452 .owner = THIS_MODULE,
453 .read = zcore_memmap_read,
454 .open = zcore_memmap_open,
455 .release = zcore_memmap_release,
456 .llseek = no_llseek,
457 };
458
459 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
460 size_t count, loff_t *ppos)
461 {
462 if (ipl_block) {
463 diag308(DIAG308_SET, ipl_block);
464 diag308(DIAG308_IPL, NULL);
465 }
466 return count;
467 }
468
469 static int zcore_reipl_open(struct inode *inode, struct file *filp)
470 {
471 return nonseekable_open(inode, filp);
472 }
473
474 static int zcore_reipl_release(struct inode *inode, struct file *filp)
475 {
476 return 0;
477 }
478
479 static const struct file_operations zcore_reipl_fops = {
480 .owner = THIS_MODULE,
481 .write = zcore_reipl_write,
482 .open = zcore_reipl_open,
483 .release = zcore_reipl_release,
484 .llseek = no_llseek,
485 };
486
487 static ssize_t zcore_hsa_read(struct file *filp, char __user *buf,
488 size_t count, loff_t *ppos)
489 {
490 static char str[18];
491
492 if (hsa_available)
493 snprintf(str, sizeof(str), "%lx\n", sclp_get_hsa_size());
494 else
495 snprintf(str, sizeof(str), "0\n");
496 return simple_read_from_buffer(buf, count, ppos, str, strlen(str));
497 }
498
499 static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf,
500 size_t count, loff_t *ppos)
501 {
502 char value;
503
504 if (*ppos != 0)
505 return -EPIPE;
506 if (copy_from_user(&value, buf, 1))
507 return -EFAULT;
508 if (value != '0')
509 return -EINVAL;
510 release_hsa();
511 return count;
512 }
513
514 static const struct file_operations zcore_hsa_fops = {
515 .owner = THIS_MODULE,
516 .write = zcore_hsa_write,
517 .read = zcore_hsa_read,
518 .open = nonseekable_open,
519 .llseek = no_llseek,
520 };
521
522 #ifdef CONFIG_32BIT
523
524 static void __init set_lc_mask(struct save_area *map)
525 {
526 memset(&map->ext_save, 0xff, sizeof(map->ext_save));
527 memset(&map->timer, 0xff, sizeof(map->timer));
528 memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
529 memset(&map->psw, 0xff, sizeof(map->psw));
530 memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
531 memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
532 memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
533 memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
534 memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
535 }
536
537 #else /* CONFIG_32BIT */
538
539 static void __init set_lc_mask(struct save_area *map)
540 {
541 memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
542 memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
543 memset(&map->psw, 0xff, sizeof(map->psw));
544 memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
545 memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
546 memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
547 memset(&map->timer, 0xff, sizeof(map->timer));
548 memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
549 memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
550 memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
551 }
552
553 #endif /* CONFIG_32BIT */
554
555 /*
556 * Initialize dump globals for a given architecture
557 */
558 static int __init sys_info_init(enum arch_id arch, unsigned long mem_end)
559 {
560 int rc;
561
562 switch (arch) {
563 case ARCH_S390X:
564 pr_alert("DETECTED 'S390X (64 bit) OS'\n");
565 break;
566 case ARCH_S390:
567 pr_alert("DETECTED 'S390 (32 bit) OS'\n");
568 break;
569 default:
570 pr_alert("0x%x is an unknown architecture.\n",arch);
571 return -EINVAL;
572 }
573 sys_info.sa_base = SAVE_AREA_BASE;
574 sys_info.sa_size = sizeof(struct save_area);
575 sys_info.arch = arch;
576 set_lc_mask(&sys_info.lc_mask);
577 rc = init_cpu_info(arch);
578 if (rc)
579 return rc;
580 sys_info.mem_size = mem_end;
581
582 return 0;
583 }
584
585 static int __init check_sdias(void)
586 {
587 if (!sclp_get_hsa_size()) {
588 TRACE("Could not determine HSA size\n");
589 return -ENODEV;
590 }
591 return 0;
592 }
593
594 static int __init get_mem_info(unsigned long *mem, unsigned long *end)
595 {
596 int i;
597 struct mem_chunk *chunk_array;
598
599 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
600 GFP_KERNEL);
601 if (!chunk_array)
602 return -ENOMEM;
603 detect_memory_layout(chunk_array, 0);
604 for (i = 0; i < MEMORY_CHUNKS; i++) {
605 if (chunk_array[i].size == 0)
606 break;
607 *mem += chunk_array[i].size;
608 *end = max(*end, chunk_array[i].addr + chunk_array[i].size);
609 }
610 kfree(chunk_array);
611 return 0;
612 }
613
614 static void __init zcore_header_init(int arch, struct zcore_header *hdr,
615 unsigned long mem_size)
616 {
617 u32 prefix;
618 int i;
619
620 if (arch == ARCH_S390X)
621 hdr->arch_id = DUMP_ARCH_S390X;
622 else
623 hdr->arch_id = DUMP_ARCH_S390;
624 hdr->mem_size = mem_size;
625 hdr->rmem_size = mem_size;
626 hdr->mem_end = sys_info.mem_size;
627 hdr->num_pages = mem_size / PAGE_SIZE;
628 hdr->tod = get_tod_clock();
629 get_cpu_id(&hdr->cpu_id);
630 for (i = 0; i < dump_save_areas.count; i++) {
631 prefix = dump_save_areas.areas[i]->pref_reg;
632 hdr->real_cpu_cnt++;
633 if (!prefix)
634 continue;
635 hdr->lc_vec[hdr->cpu_cnt] = prefix;
636 hdr->cpu_cnt++;
637 }
638 }
639
640 /*
641 * Provide IPL parameter information block from either HSA or memory
642 * for future reipl
643 */
644 static int __init zcore_reipl_init(void)
645 {
646 struct ipib_info ipib_info;
647 int rc;
648
649 rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
650 if (rc)
651 return rc;
652 if (ipib_info.ipib == 0)
653 return 0;
654 ipl_block = (void *) __get_free_page(GFP_KERNEL);
655 if (!ipl_block)
656 return -ENOMEM;
657 if (ipib_info.ipib < sclp_get_hsa_size())
658 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
659 else
660 rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
661 if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
662 ipib_info.checksum) {
663 TRACE("Checksum does not match\n");
664 free_page((unsigned long) ipl_block);
665 ipl_block = NULL;
666 }
667 return 0;
668 }
669
670 static int __init zcore_init(void)
671 {
672 unsigned long mem_size, mem_end;
673 unsigned char arch;
674 int rc;
675
676 mem_size = mem_end = 0;
677 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
678 return -ENODATA;
679 if (OLDMEM_BASE)
680 return -ENODATA;
681
682 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
683 debug_register_view(zcore_dbf, &debug_sprintf_view);
684 debug_set_level(zcore_dbf, 6);
685
686 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
687 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
688 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
689
690 rc = sclp_sdias_init();
691 if (rc)
692 goto fail;
693
694 rc = check_sdias();
695 if (rc)
696 goto fail;
697 hsa_available = 1;
698
699 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
700 if (rc)
701 goto fail;
702
703 #ifdef CONFIG_64BIT
704 if (arch == ARCH_S390) {
705 pr_alert("The 64-bit dump tool cannot be used for a "
706 "32-bit system\n");
707 rc = -EINVAL;
708 goto fail;
709 }
710 #else /* CONFIG_64BIT */
711 if (arch == ARCH_S390X) {
712 pr_alert("The 32-bit dump tool cannot be used for a "
713 "64-bit system\n");
714 rc = -EINVAL;
715 goto fail;
716 }
717 #endif /* CONFIG_64BIT */
718
719 rc = get_mem_info(&mem_size, &mem_end);
720 if (rc)
721 goto fail;
722
723 rc = sys_info_init(arch, mem_end);
724 if (rc)
725 goto fail;
726 zcore_header_init(arch, &zcore_header, mem_size);
727
728 rc = zcore_reipl_init();
729 if (rc)
730 goto fail;
731
732 zcore_dir = debugfs_create_dir("zcore" , NULL);
733 if (!zcore_dir) {
734 rc = -ENOMEM;
735 goto fail;
736 }
737 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
738 &zcore_fops);
739 if (!zcore_file) {
740 rc = -ENOMEM;
741 goto fail_dir;
742 }
743 zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
744 NULL, &zcore_memmap_fops);
745 if (!zcore_memmap_file) {
746 rc = -ENOMEM;
747 goto fail_file;
748 }
749 zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
750 NULL, &zcore_reipl_fops);
751 if (!zcore_reipl_file) {
752 rc = -ENOMEM;
753 goto fail_memmap_file;
754 }
755 zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
756 NULL, &zcore_hsa_fops);
757 if (!zcore_hsa_file) {
758 rc = -ENOMEM;
759 goto fail_reipl_file;
760 }
761 return 0;
762
763 fail_reipl_file:
764 debugfs_remove(zcore_reipl_file);
765 fail_memmap_file:
766 debugfs_remove(zcore_memmap_file);
767 fail_file:
768 debugfs_remove(zcore_file);
769 fail_dir:
770 debugfs_remove(zcore_dir);
771 fail:
772 diag308(DIAG308_REL_HSA, NULL);
773 return rc;
774 }
775
776 static void __exit zcore_exit(void)
777 {
778 debug_unregister(zcore_dbf);
779 sclp_sdias_exit();
780 free_page((unsigned long) ipl_block);
781 debugfs_remove(zcore_hsa_file);
782 debugfs_remove(zcore_reipl_file);
783 debugfs_remove(zcore_memmap_file);
784 debugfs_remove(zcore_file);
785 debugfs_remove(zcore_dir);
786 diag308(DIAG308_REL_HSA, NULL);
787 }
788
789 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
790 MODULE_DESCRIPTION("zcore module for zfcpdump support");
791 MODULE_LICENSE("GPL");
792
793 subsys_initcall(zcore_init);
794 module_exit(zcore_exit);
Linus' kernel tree