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Full support for Ginger Console
[linux-ginger.git] / drivers / s390 / char / zcore.c
blob82daa3c1dc9c45eb4619156f849f71902309c66d
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/miscdevice.h>
17 #include <linux/debugfs.h>
18 #include <asm/ipl.h>
19 #include <asm/sclp.h>
20 #include <asm/setup.h>
21 #include <asm/sigp.h>
22 #include <asm/uaccess.h>
23 #include <asm/debug.h>
24 #include <asm/processor.h>
25 #include <asm/irqflags.h>
26 #include <asm/checksum.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 struct ipib_info {
52 unsigned long ipib;
53 u32 checksum;
54 } __attribute__((packed));
55
56 static struct sys_info sys_info;
57 static struct debug_info *zcore_dbf;
58 static int hsa_available;
59 static struct dentry *zcore_dir;
60 static struct dentry *zcore_file;
61 static struct dentry *zcore_memmap_file;
62 static struct dentry *zcore_reipl_file;
63 static struct ipl_parameter_block *ipl_block;
64
65 /*
66 * Copy memory from HSA to kernel or user memory (not reentrant):
67 *
68 * @dest: Kernel or user buffer where memory should be copied to
69 * @src: Start address within HSA where data should be copied
70 * @count: Size of buffer, which should be copied
71 * @mode: Either TO_KERNEL or TO_USER
72 */
73 static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
74 {
75 int offs, blk_num;
76 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
77
78 if (count == 0)
79 return 0;
80
81 /* copy first block */
82 offs = 0;
83 if ((src % PAGE_SIZE) != 0) {
84 blk_num = src / PAGE_SIZE + 2;
85 if (sclp_sdias_copy(buf, blk_num, 1)) {
86 TRACE("sclp_sdias_copy() failed\n");
87 return -EIO;
88 }
89 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
90 if (mode == TO_USER) {
91 if (copy_to_user((__force __user void*) dest,
92 buf + (src % PAGE_SIZE), offs))
93 return -EFAULT;
94 } else
95 memcpy(dest, buf + (src % PAGE_SIZE), offs);
96 }
97 if (offs == count)
98 goto out;
99
100 /* copy middle */
101 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
102 blk_num = (src + offs) / PAGE_SIZE + 2;
103 if (sclp_sdias_copy(buf, blk_num, 1)) {
104 TRACE("sclp_sdias_copy() failed\n");
105 return -EIO;
106 }
107 if (mode == TO_USER) {
108 if (copy_to_user((__force __user void*) dest + offs,
109 buf, PAGE_SIZE))
110 return -EFAULT;
111 } else
112 memcpy(dest + offs, buf, PAGE_SIZE);
113 }
114 if (offs == count)
115 goto out;
116
117 /* copy last block */
118 blk_num = (src + offs) / PAGE_SIZE + 2;
119 if (sclp_sdias_copy(buf, blk_num, 1)) {
120 TRACE("sclp_sdias_copy() failed\n");
121 return -EIO;
122 }
123 if (mode == TO_USER) {
124 if (copy_to_user((__force __user void*) dest + offs, buf,
125 PAGE_SIZE))
126 return -EFAULT;
127 } else
128 memcpy(dest + offs, buf, count - offs);
129 out:
130 return 0;
131 }
132
133 static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
134 {
135 return memcpy_hsa((void __force *) dest, src, count, TO_USER);
136 }
137
138 static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
139 {
140 return memcpy_hsa(dest, src, count, TO_KERNEL);
141 }
142
143 static int memcpy_real(void *dest, unsigned long src, size_t count)
144 {
145 unsigned long flags;
146 int rc = -EFAULT;
147 register unsigned long _dest asm("2") = (unsigned long) dest;
148 register unsigned long _len1 asm("3") = (unsigned long) count;
149 register unsigned long _src asm("4") = src;
150 register unsigned long _len2 asm("5") = (unsigned long) count;
151
152 if (count == 0)
153 return 0;
154 flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */
155 asm volatile (
156 "0: mvcle %1,%2,0x0\n"
157 "1: jo 0b\n"
158 " lhi %0,0x0\n"
159 "2:\n"
160 EX_TABLE(1b,2b)
161 : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
162 "+d" (_len2), "=m" (*((long*)dest))
163 : "m" (*((long*)src))
164 : "cc", "memory");
165 __raw_local_irq_ssm(flags);
166
167 return rc;
168 }
169
170 static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
171 {
172 static char buf[4096];
173 int offs = 0, size;
174
175 while (offs < count) {
176 size = min(sizeof(buf), count - offs);
177 if (memcpy_real(buf, src + offs, size))
178 return -EFAULT;
179 if (copy_to_user(dest + offs, buf, size))
180 return -EFAULT;
181 offs += size;
182 }
183 return 0;
184 }
185
186 #ifdef __s390x__
187 /*
188 * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info
189 */
190 static void __init s390x_to_s390_regs(union save_area *out, union save_area *in,
191 int cpu)
192 {
193 int i;
194
195 for (i = 0; i < 16; i++) {
196 out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff;
197 out->s390.acc_regs[i] = in->s390x.acc_regs[i];
198 out->s390.ctrl_regs[i] =
199 in->s390x.ctrl_regs[i] & 0x00000000ffffffff;
200 }
201 /* locore for 31 bit has only space for fpregs 0,2,4,6 */
202 out->s390.fp_regs[0] = in->s390x.fp_regs[0];
203 out->s390.fp_regs[1] = in->s390x.fp_regs[2];
204 out->s390.fp_regs[2] = in->s390x.fp_regs[4];
205 out->s390.fp_regs[3] = in->s390x.fp_regs[6];
206 memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4);
207 out->s390.psw[1] |= 0x8; /* set bit 12 */
208 memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4);
209 out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */
210 out->s390.pref_reg = in->s390x.pref_reg;
211 out->s390.timer = in->s390x.timer;
212 out->s390.clk_cmp = in->s390x.clk_cmp;
213 }
214
215 static void __init s390x_to_s390_save_areas(void)
216 {
217 int i = 1;
218 static union save_area tmp;
219
220 while (zfcpdump_save_areas[i]) {
221 s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i);
222 memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp));
223 i++;
224 }
225 }
226
227 #endif /* __s390x__ */
228
229 static int __init init_cpu_info(enum arch_id arch)
230 {
231 union save_area *sa;
232
233 /* get info for boot cpu from lowcore, stored in the HSA */
234
235 sa = kmalloc(sizeof(*sa), GFP_KERNEL);
236 if (!sa)
237 return -ENOMEM;
238 if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
239 TRACE("could not copy from HSA\n");
240 kfree(sa);
241 return -EIO;
242 }
243 zfcpdump_save_areas[0] = sa;
244
245 #ifdef __s390x__
246 /* convert s390x regs to s390, if we are dumping an s390 Linux */
247
248 if (arch == ARCH_S390)
249 s390x_to_s390_save_areas();
250 #endif
251
252 return 0;
253 }
254
255 static DEFINE_MUTEX(zcore_mutex);
256
257 #define DUMP_VERSION 0x3
258 #define DUMP_MAGIC 0xa8190173618f23fdULL
259 #define DUMP_ARCH_S390X 2
260 #define DUMP_ARCH_S390 1
261 #define HEADER_SIZE 4096
262
263 /* dump header dumped according to s390 crash dump format */
264
265 struct zcore_header {
266 u64 magic;
267 u32 version;
268 u32 header_size;
269 u32 dump_level;
270 u32 page_size;
271 u64 mem_size;
272 u64 mem_start;
273 u64 mem_end;
274 u32 num_pages;
275 u32 pad1;
276 u64 tod;
277 struct cpuid cpu_id;
278 u32 arch_id;
279 u32 volnr;
280 u32 build_arch;
281 u64 rmem_size;
282 char pad2[4016];
283 } __attribute__((packed,__aligned__(16)));
284
285 static struct zcore_header zcore_header = {
286 .magic = DUMP_MAGIC,
287 .version = DUMP_VERSION,
288 .header_size = 4096,
289 .dump_level = 0,
290 .page_size = PAGE_SIZE,
291 .mem_start = 0,
292 #ifdef __s390x__
293 .build_arch = DUMP_ARCH_S390X,
294 #else
295 .build_arch = DUMP_ARCH_S390,
296 #endif
297 };
298
299 /*
300 * Copy lowcore info to buffer. Use map in order to copy only register parts.
301 *
302 * @buf: User buffer
303 * @sa: Pointer to save area
304 * @sa_off: Offset in save area to copy
305 * @len: Number of bytes to copy
306 */
307 static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
308 {
309 int i;
310 char *lc_mask = (char*)&sys_info.lc_mask;
311
312 for (i = 0; i < len; i++) {
313 if (!lc_mask[i + sa_off])
314 continue;
315 if (copy_to_user(buf + i, sa + sa_off + i, 1))
316 return -EFAULT;
317 }
318 return 0;
319 }
320
321 /*
322 * Copy lowcores info to memory, if necessary
323 *
324 * @buf: User buffer
325 * @addr: Start address of buffer in dump memory
326 * @count: Size of buffer
327 */
328 static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
329 {
330 unsigned long end;
331 int i = 0;
332
333 if (count == 0)
334 return 0;
335
336 end = start + count;
337 while (zfcpdump_save_areas[i]) {
338 unsigned long cp_start, cp_end; /* copy range */
339 unsigned long sa_start, sa_end; /* save area range */
340 unsigned long prefix;
341 unsigned long sa_off, len, buf_off;
342
343 if (sys_info.arch == ARCH_S390)
344 prefix = zfcpdump_save_areas[i]->s390.pref_reg;
345 else
346 prefix = zfcpdump_save_areas[i]->s390x.pref_reg;
347
348 sa_start = prefix + sys_info.sa_base;
349 sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
350
351 if ((end < sa_start) || (start > sa_end))
352 goto next;
353 cp_start = max(start, sa_start);
354 cp_end = min(end, sa_end);
355
356 buf_off = cp_start - start;
357 sa_off = cp_start - sa_start;
358 len = cp_end - cp_start;
359
360 TRACE("copy_lc for: %lx\n", start);
361 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
362 return -EFAULT;
363 next:
364 i++;
365 }
366 return 0;
367 }
368
369 /*
370 * Read routine for zcore character device
371 * First 4K are dump header
372 * Next 32MB are HSA Memory
373 * Rest is read from absolute Memory
374 */
375 static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
376 loff_t *ppos)
377 {
378 unsigned long mem_start; /* Start address in memory */
379 size_t mem_offs; /* Offset in dump memory */
380 size_t hdr_count; /* Size of header part of output buffer */
381 size_t size;
382 int rc;
383
384 mutex_lock(&zcore_mutex);
385
386 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
387 rc = -EINVAL;
388 goto fail;
389 }
390
391 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
392
393 /* Copy dump header */
394 if (*ppos < HEADER_SIZE) {
395 size = min(count, (size_t) (HEADER_SIZE - *ppos));
396 if (copy_to_user(buf, &zcore_header + *ppos, size)) {
397 rc = -EFAULT;
398 goto fail;
399 }
400 hdr_count = size;
401 mem_start = 0;
402 } else {
403 hdr_count = 0;
404 mem_start = *ppos - HEADER_SIZE;
405 }
406
407 mem_offs = 0;
408
409 /* Copy from HSA data */
410 if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
411 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
412 - mem_start));
413 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
414 if (rc)
415 goto fail;
416
417 mem_offs += size;
418 }
419
420 /* Copy from real mem */
421 size = count - mem_offs - hdr_count;
422 rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
423 size);
424 if (rc)
425 goto fail;
426
427 /*
428 * Since s390 dump analysis tools like lcrash or crash
429 * expect register sets in the prefix pages of the cpus,
430 * we copy them into the read buffer, if necessary.
431 * buf + hdr_count: Start of memory part of output buffer
432 * mem_start: Start memory address to copy from
433 * count - hdr_count: Size of memory area to copy
434 */
435 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
436 rc = -EFAULT;
437 goto fail;
438 }
439 *ppos += count;
440 fail:
441 mutex_unlock(&zcore_mutex);
442 return (rc < 0) ? rc : count;
443 }
444
445 static int zcore_open(struct inode *inode, struct file *filp)
446 {
447 if (!hsa_available)
448 return -ENODATA;
449 else
450 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
451 }
452
453 static int zcore_release(struct inode *inode, struct file *filep)
454 {
455 diag308(DIAG308_REL_HSA, NULL);
456 hsa_available = 0;
457 return 0;
458 }
459
460 static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
461 {
462 loff_t rc;
463
464 mutex_lock(&zcore_mutex);
465 switch (orig) {
466 case 0:
467 file->f_pos = offset;
468 rc = file->f_pos;
469 break;
470 case 1:
471 file->f_pos += offset;
472 rc = file->f_pos;
473 break;
474 default:
475 rc = -EINVAL;
476 }
477 mutex_unlock(&zcore_mutex);
478 return rc;
479 }
480
481 static const struct file_operations zcore_fops = {
482 .owner = THIS_MODULE,
483 .llseek = zcore_lseek,
484 .read = zcore_read,
485 .open = zcore_open,
486 .release = zcore_release,
487 };
488
489 static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
490 size_t count, loff_t *ppos)
491 {
492 return simple_read_from_buffer(buf, count, ppos, filp->private_data,
493 MEMORY_CHUNKS * CHUNK_INFO_SIZE);
494 }
495
496 static int zcore_memmap_open(struct inode *inode, struct file *filp)
497 {
498 int i;
499 char *buf;
500 struct mem_chunk *chunk_array;
501
502 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
503 GFP_KERNEL);
504 if (!chunk_array)
505 return -ENOMEM;
506 detect_memory_layout(chunk_array);
507 buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
508 if (!buf) {
509 kfree(chunk_array);
510 return -ENOMEM;
511 }
512 for (i = 0; i < MEMORY_CHUNKS; i++) {
513 sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
514 (unsigned long long) chunk_array[i].addr,
515 (unsigned long long) chunk_array[i].size);
516 if (chunk_array[i].size == 0)
517 break;
518 }
519 kfree(chunk_array);
520 filp->private_data = buf;
521 return 0;
522 }
523
524 static int zcore_memmap_release(struct inode *inode, struct file *filp)
525 {
526 kfree(filp->private_data);
527 return 0;
528 }
529
530 static const struct file_operations zcore_memmap_fops = {
531 .owner = THIS_MODULE,
532 .read = zcore_memmap_read,
533 .open = zcore_memmap_open,
534 .release = zcore_memmap_release,
535 };
536
537 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
538 size_t count, loff_t *ppos)
539 {
540 if (ipl_block) {
541 diag308(DIAG308_SET, ipl_block);
542 diag308(DIAG308_IPL, NULL);
543 }
544 return count;
545 }
546
547 static int zcore_reipl_open(struct inode *inode, struct file *filp)
548 {
549 return 0;
550 }
551
552 static int zcore_reipl_release(struct inode *inode, struct file *filp)
553 {
554 return 0;
555 }
556
557 static const struct file_operations zcore_reipl_fops = {
558 .owner = THIS_MODULE,
559 .write = zcore_reipl_write,
560 .open = zcore_reipl_open,
561 .release = zcore_reipl_release,
562 };
563
564
565 static void __init set_s390_lc_mask(union save_area *map)
566 {
567 memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save));
568 memset(&map->s390.timer, 0xff, sizeof(map->s390.timer));
569 memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp));
570 memset(&map->s390.psw, 0xff, sizeof(map->s390.psw));
571 memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg));
572 memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs));
573 memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs));
574 memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs));
575 memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs));
576 }
577
578 static void __init set_s390x_lc_mask(union save_area *map)
579 {
580 memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs));
581 memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs));
582 memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw));
583 memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg));
584 memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg));
585 memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg));
586 memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer));
587 memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp));
588 memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs));
589 memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs));
590 }
591
592 /*
593 * Initialize dump globals for a given architecture
594 */
595 static int __init sys_info_init(enum arch_id arch)
596 {
597 int rc;
598
599 switch (arch) {
600 case ARCH_S390X:
601 pr_alert("DETECTED 'S390X (64 bit) OS'\n");
602 sys_info.sa_base = SAVE_AREA_BASE_S390X;
603 sys_info.sa_size = sizeof(struct save_area_s390x);
604 set_s390x_lc_mask(&sys_info.lc_mask);
605 break;
606 case ARCH_S390:
607 pr_alert("DETECTED 'S390 (32 bit) OS'\n");
608 sys_info.sa_base = SAVE_AREA_BASE_S390;
609 sys_info.sa_size = sizeof(struct save_area_s390);
610 set_s390_lc_mask(&sys_info.lc_mask);
611 break;
612 default:
613 pr_alert("0x%x is an unknown architecture.\n",arch);
614 return -EINVAL;
615 }
616 sys_info.arch = arch;
617 rc = init_cpu_info(arch);
618 if (rc)
619 return rc;
620 sys_info.mem_size = real_memory_size;
621
622 return 0;
623 }
624
625 static int __init check_sdias(void)
626 {
627 int rc, act_hsa_size;
628
629 rc = sclp_sdias_blk_count();
630 if (rc < 0) {
631 TRACE("Could not determine HSA size\n");
632 return rc;
633 }
634 act_hsa_size = (rc - 1) * PAGE_SIZE;
635 if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
636 TRACE("HSA size too small: %i\n", act_hsa_size);
637 return -EINVAL;
638 }
639 return 0;
640 }
641
642 static int __init get_mem_size(unsigned long *mem)
643 {
644 int i;
645 struct mem_chunk *chunk_array;
646
647 chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
648 GFP_KERNEL);
649 if (!chunk_array)
650 return -ENOMEM;
651 detect_memory_layout(chunk_array);
652 for (i = 0; i < MEMORY_CHUNKS; i++) {
653 if (chunk_array[i].size == 0)
654 break;
655 *mem += chunk_array[i].size;
656 }
657 kfree(chunk_array);
658 return 0;
659 }
660
661 static int __init zcore_header_init(int arch, struct zcore_header *hdr)
662 {
663 int rc;
664 unsigned long memory = 0;
665
666 if (arch == ARCH_S390X)
667 hdr->arch_id = DUMP_ARCH_S390X;
668 else
669 hdr->arch_id = DUMP_ARCH_S390;
670 rc = get_mem_size(&memory);
671 if (rc)
672 return rc;
673 hdr->mem_size = memory;
674 hdr->rmem_size = memory;
675 hdr->mem_end = sys_info.mem_size;
676 hdr->num_pages = memory / PAGE_SIZE;
677 hdr->tod = get_clock();
678 get_cpu_id(&hdr->cpu_id);
679 return 0;
680 }
681
682 /*
683 * Provide IPL parameter information block from either HSA or memory
684 * for future reipl
685 */
686 static int __init zcore_reipl_init(void)
687 {
688 struct ipib_info ipib_info;
689 int rc;
690
691 rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
692 if (rc)
693 return rc;
694 if (ipib_info.ipib == 0)
695 return 0;
696 ipl_block = (void *) __get_free_page(GFP_KERNEL);
697 if (!ipl_block)
698 return -ENOMEM;
699 if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE)
700 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
701 else
702 rc = memcpy_real(ipl_block, ipib_info.ipib, PAGE_SIZE);
703 if (rc) {
704 free_page((unsigned long) ipl_block);
705 return rc;
706 }
707 if (csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
708 ipib_info.checksum) {
709 TRACE("Checksum does not match\n");
710 free_page((unsigned long) ipl_block);
711 ipl_block = NULL;
712 }
713 return 0;
714 }
715
716 static int __init zcore_init(void)
717 {
718 unsigned char arch;
719 int rc;
720
721 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
722 return -ENODATA;
723
724 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
725 debug_register_view(zcore_dbf, &debug_sprintf_view);
726 debug_set_level(zcore_dbf, 6);
727
728 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
729 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
730 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
731
732 rc = sclp_sdias_init();
733 if (rc)
734 goto fail;
735
736 rc = check_sdias();
737 if (rc)
738 goto fail;
739
740 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
741 if (rc)
742 goto fail;
743
744 #ifndef __s390x__
745 if (arch == ARCH_S390X) {
746 pr_alert("The 32-bit dump tool cannot be used for a "
747 "64-bit system\n");
748 rc = -EINVAL;
749 goto fail;
750 }
751 #endif
752
753 rc = sys_info_init(arch);
754 if (rc)
755 goto fail;
756
757 rc = zcore_header_init(arch, &zcore_header);
758 if (rc)
759 goto fail;
760
761 rc = zcore_reipl_init();
762 if (rc)
763 goto fail;
764
765 zcore_dir = debugfs_create_dir("zcore" , NULL);
766 if (!zcore_dir) {
767 rc = -ENOMEM;
768 goto fail;
769 }
770 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
771 &zcore_fops);
772 if (!zcore_file) {
773 rc = -ENOMEM;
774 goto fail_dir;
775 }
776 zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
777 NULL, &zcore_memmap_fops);
778 if (!zcore_memmap_file) {
779 rc = -ENOMEM;
780 goto fail_file;
781 }
782 zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
783 NULL, &zcore_reipl_fops);
784 if (!zcore_reipl_file) {
785 rc = -ENOMEM;
786 goto fail_memmap_file;
787 }
788 hsa_available = 1;
789 return 0;
790
791 fail_memmap_file:
792 debugfs_remove(zcore_memmap_file);
793 fail_file:
794 debugfs_remove(zcore_file);
795 fail_dir:
796 debugfs_remove(zcore_dir);
797 fail:
798 diag308(DIAG308_REL_HSA, NULL);
799 return rc;
800 }
801
802 static void __exit zcore_exit(void)
803 {
804 debug_unregister(zcore_dbf);
805 sclp_sdias_exit();
806 free_page((unsigned long) ipl_block);
807 debugfs_remove(zcore_reipl_file);
808 debugfs_remove(zcore_memmap_file);
809 debugfs_remove(zcore_file);
810 debugfs_remove(zcore_dir);
811 diag308(DIAG308_REL_HSA, NULL);
812 }
813
814 MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
815 MODULE_DESCRIPTION("zcore module for zfcpdump support");
816 MODULE_LICENSE("GPL");
817
818 subsys_initcall(zcore_init);
819 module_exit(zcore_exit);
Linux for Ginger Game Console