xref: /openbmc/linux/drivers/s390/char/zcore.c (revision d7a3d85e)
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 <linux/memblock.h>
21 
22 #include <asm/asm-offsets.h>
23 #include <asm/ipl.h>
24 #include <asm/sclp.h>
25 #include <asm/setup.h>
26 #include <asm/uaccess.h>
27 #include <asm/debug.h>
28 #include <asm/processor.h>
29 #include <asm/irqflags.h>
30 #include <asm/checksum.h>
31 #include <asm/switch_to.h>
32 #include "sclp.h"
33 
34 #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
35 
36 #define TO_USER		1
37 #define TO_KERNEL	0
38 #define CHUNK_INFO_SIZE	34 /* 2 16-byte char, each followed by blank */
39 
40 enum arch_id {
41 	ARCH_S390	= 0,
42 	ARCH_S390X	= 1,
43 };
44 
45 /* dump system info */
46 
47 struct sys_info {
48 	enum arch_id	 arch;
49 	unsigned long	 sa_base;
50 	u32		 sa_size;
51 	int		 cpu_map[NR_CPUS];
52 	unsigned long	 mem_size;
53 	struct save_area lc_mask;
54 };
55 
56 struct ipib_info {
57 	unsigned long	ipib;
58 	u32		checksum;
59 }  __attribute__((packed));
60 
61 static struct sys_info sys_info;
62 static struct debug_info *zcore_dbf;
63 static int hsa_available;
64 static struct dentry *zcore_dir;
65 static struct dentry *zcore_file;
66 static struct dentry *zcore_memmap_file;
67 static struct dentry *zcore_reipl_file;
68 static struct dentry *zcore_hsa_file;
69 static struct ipl_parameter_block *ipl_block;
70 
71 /*
72  * Copy memory from HSA to kernel or user memory (not reentrant):
73  *
74  * @dest:  Kernel or user buffer where memory should be copied to
75  * @src:   Start address within HSA where data should be copied
76  * @count: Size of buffer, which should be copied
77  * @mode:  Either TO_KERNEL or TO_USER
78  */
79 int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
80 {
81 	int offs, blk_num;
82 	static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
83 
84 	if (!hsa_available)
85 		return -ENODATA;
86 	if (count == 0)
87 		return 0;
88 
89 	/* copy first block */
90 	offs = 0;
91 	if ((src % PAGE_SIZE) != 0) {
92 		blk_num = src / PAGE_SIZE + 2;
93 		if (sclp_sdias_copy(buf, blk_num, 1)) {
94 			TRACE("sclp_sdias_copy() failed\n");
95 			return -EIO;
96 		}
97 		offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
98 		if (mode == TO_USER) {
99 			if (copy_to_user((__force __user void*) dest,
100 					 buf + (src % PAGE_SIZE), offs))
101 				return -EFAULT;
102 		} else
103 			memcpy(dest, buf + (src % PAGE_SIZE), offs);
104 	}
105 	if (offs == count)
106 		goto out;
107 
108 	/* copy middle */
109 	for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
110 		blk_num = (src + offs) / PAGE_SIZE + 2;
111 		if (sclp_sdias_copy(buf, blk_num, 1)) {
112 			TRACE("sclp_sdias_copy() failed\n");
113 			return -EIO;
114 		}
115 		if (mode == TO_USER) {
116 			if (copy_to_user((__force __user void*) dest + offs,
117 					 buf, PAGE_SIZE))
118 				return -EFAULT;
119 		} else
120 			memcpy(dest + offs, buf, PAGE_SIZE);
121 	}
122 	if (offs == count)
123 		goto out;
124 
125 	/* copy last block */
126 	blk_num = (src + offs) / PAGE_SIZE + 2;
127 	if (sclp_sdias_copy(buf, blk_num, 1)) {
128 		TRACE("sclp_sdias_copy() failed\n");
129 		return -EIO;
130 	}
131 	if (mode == TO_USER) {
132 		if (copy_to_user((__force __user void*) dest + offs, buf,
133 				 count - offs))
134 			return -EFAULT;
135 	} else
136 		memcpy(dest + offs, buf, count - offs);
137 out:
138 	return 0;
139 }
140 
141 static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
142 {
143 	return memcpy_hsa((void __force *) dest, src, count, TO_USER);
144 }
145 
146 static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
147 {
148 	return memcpy_hsa(dest, src, count, TO_KERNEL);
149 }
150 
151 static int __init init_cpu_info(enum arch_id arch)
152 {
153 	struct save_area_ext *sa_ext;
154 
155 	/* get info for boot cpu from lowcore, stored in the HSA */
156 
157 	sa_ext = dump_save_area_create(0);
158 	if (!sa_ext)
159 		return -ENOMEM;
160 	if (memcpy_hsa_kernel(&sa_ext->sa, sys_info.sa_base,
161 			      sys_info.sa_size) < 0) {
162 		TRACE("could not copy from HSA\n");
163 		kfree(sa_ext);
164 		return -EIO;
165 	}
166 	if (MACHINE_HAS_VX)
167 		save_vx_regs_safe(sa_ext->vx_regs);
168 	return 0;
169 }
170 
171 static DEFINE_MUTEX(zcore_mutex);
172 
173 #define DUMP_VERSION	0x5
174 #define DUMP_MAGIC	0xa8190173618f23fdULL
175 #define DUMP_ARCH_S390X	2
176 #define DUMP_ARCH_S390	1
177 #define HEADER_SIZE	4096
178 
179 /* dump header dumped according to s390 crash dump format */
180 
181 struct zcore_header {
182 	u64 magic;
183 	u32 version;
184 	u32 header_size;
185 	u32 dump_level;
186 	u32 page_size;
187 	u64 mem_size;
188 	u64 mem_start;
189 	u64 mem_end;
190 	u32 num_pages;
191 	u32 pad1;
192 	u64 tod;
193 	struct cpuid cpu_id;
194 	u32 arch_id;
195 	u32 volnr;
196 	u32 build_arch;
197 	u64 rmem_size;
198 	u8 mvdump;
199 	u16 cpu_cnt;
200 	u16 real_cpu_cnt;
201 	u8 end_pad1[0x200-0x061];
202 	u64 mvdump_sign;
203 	u64 mvdump_zipl_time;
204 	u8 end_pad2[0x800-0x210];
205 	u32 lc_vec[512];
206 } __attribute__((packed,__aligned__(16)));
207 
208 static struct zcore_header zcore_header = {
209 	.magic		= DUMP_MAGIC,
210 	.version	= DUMP_VERSION,
211 	.header_size	= 4096,
212 	.dump_level	= 0,
213 	.page_size	= PAGE_SIZE,
214 	.mem_start	= 0,
215 	.build_arch	= DUMP_ARCH_S390X,
216 };
217 
218 /*
219  * Copy lowcore info to buffer. Use map in order to copy only register parts.
220  *
221  * @buf:    User buffer
222  * @sa:     Pointer to save area
223  * @sa_off: Offset in save area to copy
224  * @len:    Number of bytes to copy
225  */
226 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
227 {
228 	int i;
229 	char *lc_mask = (char*)&sys_info.lc_mask;
230 
231 	for (i = 0; i < len; i++) {
232 		if (!lc_mask[i + sa_off])
233 			continue;
234 		if (copy_to_user(buf + i, sa + sa_off + i, 1))
235 			return -EFAULT;
236 	}
237 	return 0;
238 }
239 
240 /*
241  * Copy lowcores info to memory, if necessary
242  *
243  * @buf:   User buffer
244  * @addr:  Start address of buffer in dump memory
245  * @count: Size of buffer
246  */
247 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
248 {
249 	unsigned long end;
250 	int i;
251 
252 	if (count == 0)
253 		return 0;
254 
255 	end = start + count;
256 	for (i = 0; i < dump_save_areas.count; i++) {
257 		unsigned long cp_start, cp_end; /* copy range */
258 		unsigned long sa_start, sa_end; /* save area range */
259 		unsigned long prefix;
260 		unsigned long sa_off, len, buf_off;
261 		struct save_area *save_area = &dump_save_areas.areas[i]->sa;
262 
263 		prefix = save_area->pref_reg;
264 		sa_start = prefix + sys_info.sa_base;
265 		sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
266 
267 		if ((end < sa_start) || (start > sa_end))
268 			continue;
269 		cp_start = max(start, sa_start);
270 		cp_end = min(end, sa_end);
271 
272 		buf_off = cp_start - start;
273 		sa_off = cp_start - sa_start;
274 		len = cp_end - cp_start;
275 
276 		TRACE("copy_lc for: %lx\n", start);
277 		if (copy_lc(buf + buf_off, save_area, sa_off, len))
278 			return -EFAULT;
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 < sclp_get_hsa_size() + HEADER_SIZE) {
334 		size = min((count - hdr_count),
335 			   (size_t) (sclp_get_hsa_size() - 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 				       memblock.memory.cnt * CHUNK_INFO_SIZE);
417 }
418 
419 static int zcore_memmap_open(struct inode *inode, struct file *filp)
420 {
421 	struct memblock_region *reg;
422 	char *buf;
423 	int i = 0;
424 
425 	buf = kzalloc(memblock.memory.cnt * CHUNK_INFO_SIZE, GFP_KERNEL);
426 	if (!buf) {
427 		return -ENOMEM;
428 	}
429 	for_each_memblock(memory, reg) {
430 		sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ",
431 			(unsigned long long) reg->base,
432 			(unsigned long long) reg->size);
433 	}
434 	filp->private_data = buf;
435 	return nonseekable_open(inode, filp);
436 }
437 
438 static int zcore_memmap_release(struct inode *inode, struct file *filp)
439 {
440 	kfree(filp->private_data);
441 	return 0;
442 }
443 
444 static 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 
452 static 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 
462 static int zcore_reipl_open(struct inode *inode, struct file *filp)
463 {
464 	return nonseekable_open(inode, filp);
465 }
466 
467 static int zcore_reipl_release(struct inode *inode, struct file *filp)
468 {
469 	return 0;
470 }
471 
472 static 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 
480 static 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 
492 static 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 
507 static 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 static void __init set_lc_mask(struct save_area *map)
516 {
517 	memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
518 	memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
519 	memset(&map->psw, 0xff, sizeof(map->psw));
520 	memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
521 	memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
522 	memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
523 	memset(&map->timer, 0xff, sizeof(map->timer));
524 	memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
525 	memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
526 	memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
527 }
528 
529 /*
530  * Initialize dump globals for a given architecture
531  */
532 static int __init sys_info_init(enum arch_id arch, unsigned long mem_end)
533 {
534 	int rc;
535 
536 	switch (arch) {
537 	case ARCH_S390X:
538 		pr_alert("DETECTED 'S390X (64 bit) OS'\n");
539 		break;
540 	case ARCH_S390:
541 		pr_alert("DETECTED 'S390 (32 bit) OS'\n");
542 		break;
543 	default:
544 		pr_alert("0x%x is an unknown architecture.\n",arch);
545 		return -EINVAL;
546 	}
547 	sys_info.sa_base = SAVE_AREA_BASE;
548 	sys_info.sa_size = sizeof(struct save_area);
549 	sys_info.arch = arch;
550 	set_lc_mask(&sys_info.lc_mask);
551 	rc = init_cpu_info(arch);
552 	if (rc)
553 		return rc;
554 	sys_info.mem_size = mem_end;
555 
556 	return 0;
557 }
558 
559 static int __init check_sdias(void)
560 {
561 	if (!sclp_get_hsa_size()) {
562 		TRACE("Could not determine HSA size\n");
563 		return -ENODEV;
564 	}
565 	return 0;
566 }
567 
568 static int __init get_mem_info(unsigned long *mem, unsigned long *end)
569 {
570 	struct memblock_region *reg;
571 
572 	for_each_memblock(memory, reg) {
573 		*mem += reg->size;
574 		*end = max_t(unsigned long, *end, reg->base + reg->size);
575 	}
576 	return 0;
577 }
578 
579 static void __init zcore_header_init(int arch, struct zcore_header *hdr,
580 				     unsigned long mem_size)
581 {
582 	u32 prefix;
583 	int i;
584 
585 	if (arch == ARCH_S390X)
586 		hdr->arch_id = DUMP_ARCH_S390X;
587 	else
588 		hdr->arch_id = DUMP_ARCH_S390;
589 	hdr->mem_size = mem_size;
590 	hdr->rmem_size = mem_size;
591 	hdr->mem_end = sys_info.mem_size;
592 	hdr->num_pages = mem_size / PAGE_SIZE;
593 	hdr->tod = get_tod_clock();
594 	get_cpu_id(&hdr->cpu_id);
595 	for (i = 0; i < dump_save_areas.count; i++) {
596 		prefix = dump_save_areas.areas[i]->sa.pref_reg;
597 		hdr->real_cpu_cnt++;
598 		if (!prefix)
599 			continue;
600 		hdr->lc_vec[hdr->cpu_cnt] = prefix;
601 		hdr->cpu_cnt++;
602 	}
603 }
604 
605 /*
606  * Provide IPL parameter information block from either HSA or memory
607  * for future reipl
608  */
609 static int __init zcore_reipl_init(void)
610 {
611 	struct ipib_info ipib_info;
612 	int rc;
613 
614 	rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
615 	if (rc)
616 		return rc;
617 	if (ipib_info.ipib == 0)
618 		return 0;
619 	ipl_block = (void *) __get_free_page(GFP_KERNEL);
620 	if (!ipl_block)
621 		return -ENOMEM;
622 	if (ipib_info.ipib < sclp_get_hsa_size())
623 		rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
624 	else
625 		rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
626 	if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
627 	    ipib_info.checksum) {
628 		TRACE("Checksum does not match\n");
629 		free_page((unsigned long) ipl_block);
630 		ipl_block = NULL;
631 	}
632 	return 0;
633 }
634 
635 static int __init zcore_init(void)
636 {
637 	unsigned long mem_size, mem_end;
638 	unsigned char arch;
639 	int rc;
640 
641 	mem_size = mem_end = 0;
642 	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
643 		return -ENODATA;
644 	if (OLDMEM_BASE)
645 		return -ENODATA;
646 
647 	zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
648 	debug_register_view(zcore_dbf, &debug_sprintf_view);
649 	debug_set_level(zcore_dbf, 6);
650 
651 	TRACE("devno:  %x\n", ipl_info.data.fcp.dev_id.devno);
652 	TRACE("wwpn:   %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
653 	TRACE("lun:    %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
654 
655 	rc = sclp_sdias_init();
656 	if (rc)
657 		goto fail;
658 
659 	rc = check_sdias();
660 	if (rc)
661 		goto fail;
662 	hsa_available = 1;
663 
664 	rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
665 	if (rc)
666 		goto fail;
667 
668 	if (arch == ARCH_S390) {
669 		pr_alert("The 64-bit dump tool cannot be used for a "
670 			 "32-bit system\n");
671 		rc = -EINVAL;
672 		goto fail;
673 	}
674 
675 	rc = get_mem_info(&mem_size, &mem_end);
676 	if (rc)
677 		goto fail;
678 
679 	rc = sys_info_init(arch, mem_end);
680 	if (rc)
681 		goto fail;
682 	zcore_header_init(arch, &zcore_header, mem_size);
683 
684 	rc = zcore_reipl_init();
685 	if (rc)
686 		goto fail;
687 
688 	zcore_dir = debugfs_create_dir("zcore" , NULL);
689 	if (!zcore_dir) {
690 		rc = -ENOMEM;
691 		goto fail;
692 	}
693 	zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
694 					 &zcore_fops);
695 	if (!zcore_file) {
696 		rc = -ENOMEM;
697 		goto fail_dir;
698 	}
699 	zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
700 						NULL, &zcore_memmap_fops);
701 	if (!zcore_memmap_file) {
702 		rc = -ENOMEM;
703 		goto fail_file;
704 	}
705 	zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
706 						NULL, &zcore_reipl_fops);
707 	if (!zcore_reipl_file) {
708 		rc = -ENOMEM;
709 		goto fail_memmap_file;
710 	}
711 	zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
712 					     NULL, &zcore_hsa_fops);
713 	if (!zcore_hsa_file) {
714 		rc = -ENOMEM;
715 		goto fail_reipl_file;
716 	}
717 	return 0;
718 
719 fail_reipl_file:
720 	debugfs_remove(zcore_reipl_file);
721 fail_memmap_file:
722 	debugfs_remove(zcore_memmap_file);
723 fail_file:
724 	debugfs_remove(zcore_file);
725 fail_dir:
726 	debugfs_remove(zcore_dir);
727 fail:
728 	diag308(DIAG308_REL_HSA, NULL);
729 	return rc;
730 }
731 
732 static void __exit zcore_exit(void)
733 {
734 	debug_unregister(zcore_dbf);
735 	sclp_sdias_exit();
736 	free_page((unsigned long) ipl_block);
737 	debugfs_remove(zcore_hsa_file);
738 	debugfs_remove(zcore_reipl_file);
739 	debugfs_remove(zcore_memmap_file);
740 	debugfs_remove(zcore_file);
741 	debugfs_remove(zcore_dir);
742 	diag308(DIAG308_REL_HSA, NULL);
743 }
744 
745 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
746 MODULE_DESCRIPTION("zcore module for zfcpdump support");
747 MODULE_LICENSE("GPL");
748 
749 subsys_initcall(zcore_init);
750 module_exit(zcore_exit);
751