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411ed322 MH |
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 | #include <linux/init.h> | |
13 | #include <linux/miscdevice.h> | |
14 | #include <linux/utsname.h> | |
15 | #include <linux/debugfs.h> | |
16 | #include <asm/ipl.h> | |
17 | #include <asm/sclp.h> | |
18 | #include <asm/setup.h> | |
19 | #include <asm/sigp.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/debug.h> | |
22 | #include <asm/processor.h> | |
23 | #include <asm/irqflags.h> | |
24 | ||
25 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
26 | #define MSG(x...) printk( KERN_ALERT x ) | |
27 | #define ERROR_MSG(x...) printk ( KERN_ALERT "DUMP: " x ) | |
28 | ||
29 | #define TO_USER 0 | |
30 | #define TO_KERNEL 1 | |
31 | ||
32 | enum arch_id { | |
33 | ARCH_S390 = 0, | |
34 | ARCH_S390X = 1, | |
35 | }; | |
36 | ||
37 | /* dump system info */ | |
38 | ||
39 | struct sys_info { | |
40 | enum arch_id arch; | |
41 | unsigned long sa_base; | |
42 | u32 sa_size; | |
43 | int cpu_map[NR_CPUS]; | |
44 | unsigned long mem_size; | |
45 | union save_area lc_mask; | |
46 | }; | |
47 | ||
48 | static struct sys_info sys_info; | |
49 | static struct debug_info *zcore_dbf; | |
50 | static int hsa_available; | |
51 | static struct dentry *zcore_dir; | |
52 | static struct dentry *zcore_file; | |
53 | ||
54 | /* | |
55 | * Copy memory from HSA to kernel or user memory (not reentrant): | |
56 | * | |
57 | * @dest: Kernel or user buffer where memory should be copied to | |
58 | * @src: Start address within HSA where data should be copied | |
59 | * @count: Size of buffer, which should be copied | |
60 | * @mode: Either TO_KERNEL or TO_USER | |
61 | */ | |
62 | static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) | |
63 | { | |
64 | int offs, blk_num; | |
65 | static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
66 | ||
67 | if (count == 0) | |
68 | return 0; | |
69 | ||
70 | /* copy first block */ | |
71 | offs = 0; | |
72 | if ((src % PAGE_SIZE) != 0) { | |
73 | blk_num = src / PAGE_SIZE + 2; | |
74 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
75 | TRACE("sclp_sdias_copy() failed\n"); | |
76 | return -EIO; | |
77 | } | |
78 | offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); | |
79 | if (mode == TO_USER) { | |
80 | if (copy_to_user((__force __user void*) dest, | |
81 | buf + (src % PAGE_SIZE), offs)) | |
82 | return -EFAULT; | |
83 | } else | |
84 | memcpy(dest, buf + (src % PAGE_SIZE), offs); | |
85 | } | |
86 | if (offs == count) | |
87 | goto out; | |
88 | ||
89 | /* copy middle */ | |
90 | for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { | |
91 | blk_num = (src + offs) / PAGE_SIZE + 2; | |
92 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
93 | TRACE("sclp_sdias_copy() failed\n"); | |
94 | return -EIO; | |
95 | } | |
96 | if (mode == TO_USER) { | |
97 | if (copy_to_user((__force __user void*) dest + offs, | |
98 | buf, PAGE_SIZE)) | |
99 | return -EFAULT; | |
100 | } else | |
101 | memcpy(dest + offs, buf, PAGE_SIZE); | |
102 | } | |
103 | if (offs == count) | |
104 | goto out; | |
105 | ||
106 | /* copy last block */ | |
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, buf, | |
114 | PAGE_SIZE)) | |
115 | return -EFAULT; | |
116 | } else | |
117 | memcpy(dest + offs, buf, count - offs); | |
118 | out: | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) | |
123 | { | |
124 | return memcpy_hsa((void __force *) dest, src, count, TO_USER); | |
125 | } | |
126 | ||
127 | static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) | |
128 | { | |
129 | return memcpy_hsa(dest, src, count, TO_KERNEL); | |
130 | } | |
131 | ||
132 | static int memcpy_real(void *dest, unsigned long src, size_t count) | |
133 | { | |
134 | unsigned long flags; | |
135 | int rc = -EFAULT; | |
136 | register unsigned long _dest asm("2") = (unsigned long) dest; | |
137 | register unsigned long _len1 asm("3") = (unsigned long) count; | |
138 | register unsigned long _src asm("4") = src; | |
139 | register unsigned long _len2 asm("5") = (unsigned long) count; | |
140 | ||
141 | if (count == 0) | |
142 | return 0; | |
143 | flags = __raw_local_irq_stnsm(0xf8); /* switch to real mode */ | |
144 | asm volatile ( | |
145 | "0: mvcle %1,%2,0x0\n" | |
146 | "1: jo 0b\n" | |
147 | " lhi %0,0x0\n" | |
148 | "2:\n" | |
149 | EX_TABLE(1b,2b) | |
150 | : "+d" (rc) | |
151 | : "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2) | |
152 | : "cc", "memory"); | |
153 | __raw_local_irq_ssm(flags); | |
154 | ||
155 | return rc; | |
156 | } | |
157 | ||
158 | static int memcpy_real_user(__user void *dest, unsigned long src, size_t count) | |
159 | { | |
160 | static char buf[4096]; | |
161 | int offs = 0, size; | |
162 | ||
163 | while (offs < count) { | |
164 | size = min(sizeof(buf), count - offs); | |
165 | if (memcpy_real(buf, src + offs, size)) | |
166 | return -EFAULT; | |
167 | if (copy_to_user(dest + offs, buf, size)) | |
168 | return -EFAULT; | |
169 | offs += size; | |
170 | } | |
171 | return 0; | |
172 | } | |
173 | ||
174 | #ifdef __s390x__ | |
175 | /* | |
176 | * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info | |
177 | */ | |
178 | static void __init s390x_to_s390_regs(union save_area *out, union save_area *in, | |
179 | int cpu) | |
180 | { | |
181 | int i; | |
182 | ||
183 | for (i = 0; i < 16; i++) { | |
184 | out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff; | |
185 | out->s390.acc_regs[i] = in->s390x.acc_regs[i]; | |
186 | out->s390.ctrl_regs[i] = | |
187 | in->s390x.ctrl_regs[i] & 0x00000000ffffffff; | |
188 | } | |
189 | /* locore for 31 bit has only space for fpregs 0,2,4,6 */ | |
190 | out->s390.fp_regs[0] = in->s390x.fp_regs[0]; | |
191 | out->s390.fp_regs[1] = in->s390x.fp_regs[2]; | |
192 | out->s390.fp_regs[2] = in->s390x.fp_regs[4]; | |
193 | out->s390.fp_regs[3] = in->s390x.fp_regs[6]; | |
194 | memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4); | |
195 | out->s390.psw[1] |= 0x8; /* set bit 12 */ | |
196 | memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4); | |
197 | out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */ | |
198 | out->s390.pref_reg = in->s390x.pref_reg; | |
199 | out->s390.timer = in->s390x.timer; | |
200 | out->s390.clk_cmp = in->s390x.clk_cmp; | |
201 | } | |
202 | ||
203 | static void __init s390x_to_s390_save_areas(void) | |
204 | { | |
205 | int i = 1; | |
206 | static union save_area tmp; | |
207 | ||
208 | while (zfcpdump_save_areas[i]) { | |
209 | s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i); | |
210 | memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp)); | |
211 | i++; | |
212 | } | |
213 | } | |
214 | ||
215 | #endif /* __s390x__ */ | |
216 | ||
217 | static int __init init_cpu_info(enum arch_id arch) | |
218 | { | |
219 | union save_area *sa; | |
220 | ||
221 | /* get info for boot cpu from lowcore, stored in the HSA */ | |
222 | ||
223 | sa = kmalloc(sizeof(*sa), GFP_KERNEL); | |
224 | if (!sa) { | |
225 | ERROR_MSG("kmalloc failed: %s: %i\n",__FUNCTION__, __LINE__); | |
226 | return -ENOMEM; | |
227 | } | |
228 | if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) { | |
229 | ERROR_MSG("could not copy from HSA\n"); | |
230 | kfree(sa); | |
231 | return -EIO; | |
232 | } | |
233 | zfcpdump_save_areas[0] = sa; | |
234 | ||
235 | #ifdef __s390x__ | |
236 | /* convert s390x regs to s390, if we are dumping an s390 Linux */ | |
237 | ||
238 | if (arch == ARCH_S390) | |
239 | s390x_to_s390_save_areas(); | |
240 | #endif | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static DEFINE_MUTEX(zcore_mutex); | |
246 | ||
247 | #define DUMP_VERSION 0x3 | |
248 | #define DUMP_MAGIC 0xa8190173618f23fdULL | |
249 | #define DUMP_ARCH_S390X 2 | |
250 | #define DUMP_ARCH_S390 1 | |
251 | #define HEADER_SIZE 4096 | |
252 | ||
253 | /* dump header dumped according to s390 crash dump format */ | |
254 | ||
255 | struct zcore_header { | |
256 | u64 magic; | |
257 | u32 version; | |
258 | u32 header_size; | |
259 | u32 dump_level; | |
260 | u32 page_size; | |
261 | u64 mem_size; | |
262 | u64 mem_start; | |
263 | u64 mem_end; | |
264 | u32 num_pages; | |
265 | u32 pad1; | |
266 | u64 tod; | |
267 | cpuid_t cpu_id; | |
268 | u32 arch_id; | |
269 | u32 build_arch; | |
270 | char pad2[4016]; | |
271 | } __attribute__((packed,__aligned__(16))); | |
272 | ||
273 | static struct zcore_header zcore_header = { | |
274 | .magic = DUMP_MAGIC, | |
275 | .version = DUMP_VERSION, | |
276 | .header_size = 4096, | |
277 | .dump_level = 0, | |
278 | .page_size = PAGE_SIZE, | |
279 | .mem_start = 0, | |
280 | #ifdef __s390x__ | |
281 | .build_arch = DUMP_ARCH_S390X, | |
282 | #else | |
283 | .build_arch = DUMP_ARCH_S390, | |
284 | #endif | |
285 | }; | |
286 | ||
287 | /* | |
288 | * Copy lowcore info to buffer. Use map in order to copy only register parts. | |
289 | * | |
290 | * @buf: User buffer | |
291 | * @sa: Pointer to save area | |
292 | * @sa_off: Offset in save area to copy | |
293 | * @len: Number of bytes to copy | |
294 | */ | |
295 | static int copy_lc(void __user *buf, void *sa, int sa_off, int len) | |
296 | { | |
297 | int i; | |
298 | char *lc_mask = (char*)&sys_info.lc_mask; | |
299 | ||
300 | for (i = 0; i < len; i++) { | |
301 | if (!lc_mask[i + sa_off]) | |
302 | continue; | |
303 | if (copy_to_user(buf + i, sa + sa_off + i, 1)) | |
304 | return -EFAULT; | |
305 | } | |
306 | return 0; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Copy lowcores info to memory, if necessary | |
311 | * | |
312 | * @buf: User buffer | |
313 | * @addr: Start address of buffer in dump memory | |
314 | * @count: Size of buffer | |
315 | */ | |
316 | static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) | |
317 | { | |
318 | unsigned long end; | |
319 | int i = 0; | |
320 | ||
321 | if (count == 0) | |
322 | return 0; | |
323 | ||
324 | end = start + count; | |
325 | while (zfcpdump_save_areas[i]) { | |
326 | unsigned long cp_start, cp_end; /* copy range */ | |
327 | unsigned long sa_start, sa_end; /* save area range */ | |
328 | unsigned long prefix; | |
329 | unsigned long sa_off, len, buf_off; | |
330 | ||
331 | if (sys_info.arch == ARCH_S390) | |
332 | prefix = zfcpdump_save_areas[i]->s390.pref_reg; | |
333 | else | |
334 | prefix = zfcpdump_save_areas[i]->s390x.pref_reg; | |
335 | ||
336 | sa_start = prefix + sys_info.sa_base; | |
337 | sa_end = prefix + sys_info.sa_base + sys_info.sa_size; | |
338 | ||
339 | if ((end < sa_start) || (start > sa_end)) | |
340 | goto next; | |
341 | cp_start = max(start, sa_start); | |
342 | cp_end = min(end, sa_end); | |
343 | ||
344 | buf_off = cp_start - start; | |
345 | sa_off = cp_start - sa_start; | |
346 | len = cp_end - cp_start; | |
347 | ||
348 | TRACE("copy_lc for: %lx\n", start); | |
349 | if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len)) | |
350 | return -EFAULT; | |
351 | next: | |
352 | i++; | |
353 | } | |
354 | return 0; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Read routine for zcore character device | |
359 | * First 4K are dump header | |
360 | * Next 32MB are HSA Memory | |
361 | * Rest is read from absolute Memory | |
362 | */ | |
363 | static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, | |
364 | loff_t *ppos) | |
365 | { | |
366 | unsigned long mem_start; /* Start address in memory */ | |
367 | size_t mem_offs; /* Offset in dump memory */ | |
368 | size_t hdr_count; /* Size of header part of output buffer */ | |
369 | size_t size; | |
370 | int rc; | |
371 | ||
372 | mutex_lock(&zcore_mutex); | |
373 | ||
374 | if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { | |
375 | rc = -EINVAL; | |
376 | goto fail; | |
377 | } | |
378 | ||
379 | count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); | |
380 | ||
381 | /* Copy dump header */ | |
382 | if (*ppos < HEADER_SIZE) { | |
383 | size = min(count, (size_t) (HEADER_SIZE - *ppos)); | |
384 | if (copy_to_user(buf, &zcore_header + *ppos, size)) { | |
385 | rc = -EFAULT; | |
386 | goto fail; | |
387 | } | |
388 | hdr_count = size; | |
389 | mem_start = 0; | |
390 | } else { | |
391 | hdr_count = 0; | |
392 | mem_start = *ppos - HEADER_SIZE; | |
393 | } | |
394 | ||
395 | mem_offs = 0; | |
396 | ||
397 | /* Copy from HSA data */ | |
398 | if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) { | |
399 | size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE | |
400 | - mem_start)); | |
401 | rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); | |
402 | if (rc) | |
403 | goto fail; | |
404 | ||
405 | mem_offs += size; | |
406 | } | |
407 | ||
408 | /* Copy from real mem */ | |
409 | size = count - mem_offs - hdr_count; | |
410 | rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs, | |
411 | size); | |
412 | if (rc) | |
413 | goto fail; | |
414 | ||
415 | /* | |
416 | * Since s390 dump analysis tools like lcrash or crash | |
417 | * expect register sets in the prefix pages of the cpus, | |
418 | * we copy them into the read buffer, if necessary. | |
419 | * buf + hdr_count: Start of memory part of output buffer | |
420 | * mem_start: Start memory address to copy from | |
421 | * count - hdr_count: Size of memory area to copy | |
422 | */ | |
423 | if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { | |
424 | rc = -EFAULT; | |
425 | goto fail; | |
426 | } | |
427 | *ppos += count; | |
428 | fail: | |
429 | mutex_unlock(&zcore_mutex); | |
430 | return (rc < 0) ? rc : count; | |
431 | } | |
432 | ||
433 | static int zcore_open(struct inode *inode, struct file *filp) | |
434 | { | |
435 | if (!hsa_available) | |
436 | return -ENODATA; | |
437 | else | |
438 | return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; | |
439 | } | |
440 | ||
441 | static int zcore_release(struct inode *inode, struct file *filep) | |
442 | { | |
443 | diag308(DIAG308_REL_HSA, NULL); | |
444 | hsa_available = 0; | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) | |
449 | { | |
450 | loff_t rc; | |
451 | ||
452 | mutex_lock(&zcore_mutex); | |
453 | switch (orig) { | |
454 | case 0: | |
455 | file->f_pos = offset; | |
456 | rc = file->f_pos; | |
457 | break; | |
458 | case 1: | |
459 | file->f_pos += offset; | |
460 | rc = file->f_pos; | |
461 | break; | |
462 | default: | |
463 | rc = -EINVAL; | |
464 | } | |
465 | mutex_unlock(&zcore_mutex); | |
466 | return rc; | |
467 | } | |
468 | ||
469 | static struct file_operations zcore_fops = { | |
470 | .owner = THIS_MODULE, | |
471 | .llseek = zcore_lseek, | |
472 | .read = zcore_read, | |
473 | .open = zcore_open, | |
474 | .release = zcore_release, | |
475 | }; | |
476 | ||
477 | ||
478 | static void __init set_s390_lc_mask(union save_area *map) | |
479 | { | |
480 | memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save)); | |
481 | memset(&map->s390.timer, 0xff, sizeof(map->s390.timer)); | |
482 | memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp)); | |
483 | memset(&map->s390.psw, 0xff, sizeof(map->s390.psw)); | |
484 | memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg)); | |
485 | memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs)); | |
486 | memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs)); | |
487 | memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs)); | |
488 | memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs)); | |
489 | } | |
490 | ||
491 | static void __init set_s390x_lc_mask(union save_area *map) | |
492 | { | |
493 | memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs)); | |
494 | memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs)); | |
495 | memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw)); | |
496 | memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg)); | |
497 | memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg)); | |
498 | memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg)); | |
499 | memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer)); | |
500 | memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp)); | |
501 | memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs)); | |
502 | memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs)); | |
503 | } | |
504 | ||
505 | /* | |
506 | * Initialize dump globals for a given architecture | |
507 | */ | |
508 | static int __init sys_info_init(enum arch_id arch) | |
509 | { | |
510 | switch (arch) { | |
511 | case ARCH_S390X: | |
512 | MSG("DETECTED 'S390X (64 bit) OS'\n"); | |
513 | sys_info.sa_base = SAVE_AREA_BASE_S390X; | |
514 | sys_info.sa_size = sizeof(struct save_area_s390x); | |
515 | set_s390x_lc_mask(&sys_info.lc_mask); | |
516 | break; | |
517 | case ARCH_S390: | |
518 | MSG("DETECTED 'S390 (32 bit) OS'\n"); | |
519 | sys_info.sa_base = SAVE_AREA_BASE_S390; | |
520 | sys_info.sa_size = sizeof(struct save_area_s390); | |
521 | set_s390_lc_mask(&sys_info.lc_mask); | |
522 | break; | |
523 | default: | |
524 | ERROR_MSG("unknown architecture 0x%x.\n",arch); | |
525 | return -EINVAL; | |
526 | } | |
527 | sys_info.arch = arch; | |
528 | if (init_cpu_info(arch)) { | |
529 | ERROR_MSG("get cpu info failed\n"); | |
530 | return -ENOMEM; | |
531 | } | |
532 | sys_info.mem_size = real_memory_size; | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static int __init check_sdias(void) | |
538 | { | |
539 | int rc, act_hsa_size; | |
540 | ||
541 | rc = sclp_sdias_blk_count(); | |
542 | if (rc < 0) { | |
543 | ERROR_MSG("Could not determine HSA size\n"); | |
544 | return rc; | |
545 | } | |
546 | act_hsa_size = (rc - 1) * PAGE_SIZE; | |
547 | if (act_hsa_size < ZFCPDUMP_HSA_SIZE) { | |
548 | ERROR_MSG("HSA size too small: %i\n", act_hsa_size); | |
549 | return -EINVAL; | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static void __init zcore_header_init(int arch, struct zcore_header *hdr) | |
555 | { | |
556 | if (arch == ARCH_S390X) | |
557 | hdr->arch_id = DUMP_ARCH_S390X; | |
558 | else | |
559 | hdr->arch_id = DUMP_ARCH_S390; | |
560 | hdr->mem_size = sys_info.mem_size; | |
561 | hdr->mem_end = sys_info.mem_size; | |
562 | hdr->num_pages = sys_info.mem_size / PAGE_SIZE; | |
563 | hdr->tod = get_clock(); | |
564 | get_cpu_id(&hdr->cpu_id); | |
565 | } | |
566 | ||
567 | extern int sdias_init(void); | |
568 | ||
569 | static int __init zcore_init(void) | |
570 | { | |
571 | unsigned char arch; | |
572 | int rc; | |
573 | ||
574 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) | |
575 | return -ENODATA; | |
576 | ||
577 | zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); | |
578 | debug_register_view(zcore_dbf, &debug_sprintf_view); | |
579 | debug_set_level(zcore_dbf, 6); | |
580 | ||
581 | TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); | |
582 | TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); | |
583 | TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); | |
584 | ||
585 | rc = sdias_init(); | |
586 | if (rc) | |
587 | goto fail; | |
588 | ||
589 | rc = check_sdias(); | |
590 | if (rc) { | |
591 | ERROR_MSG("Dump initialization failed\n"); | |
592 | goto fail; | |
593 | } | |
594 | ||
595 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
596 | if (rc) { | |
597 | ERROR_MSG("sdial memcpy for arch id failed\n"); | |
598 | goto fail; | |
599 | } | |
600 | ||
601 | #ifndef __s390x__ | |
602 | if (arch == ARCH_S390X) { | |
603 | ERROR_MSG("32 bit dumper can't dump 64 bit system!\n"); | |
604 | rc = -EINVAL; | |
605 | goto fail; | |
606 | } | |
607 | #endif | |
608 | ||
609 | rc = sys_info_init(arch); | |
610 | if (rc) { | |
611 | ERROR_MSG("arch init failed\n"); | |
612 | goto fail; | |
613 | } | |
614 | ||
615 | zcore_header_init(arch, &zcore_header); | |
616 | ||
617 | zcore_dir = debugfs_create_dir("zcore" , NULL); | |
618 | if (!zcore_dir) { | |
619 | rc = -ENOMEM; | |
620 | goto fail; | |
621 | } | |
622 | zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, | |
623 | &zcore_fops); | |
624 | if (!zcore_file) { | |
625 | debugfs_remove(zcore_dir); | |
626 | rc = -ENOMEM; | |
627 | goto fail; | |
628 | } | |
629 | hsa_available = 1; | |
630 | return 0; | |
631 | ||
632 | fail: | |
633 | diag308(DIAG308_REL_HSA, NULL); | |
634 | return rc; | |
635 | } | |
636 | ||
637 | extern void sdias_exit(void); | |
638 | ||
639 | static void __exit zcore_exit(void) | |
640 | { | |
641 | debug_unregister(zcore_dbf); | |
642 | sdias_exit(); | |
643 | diag308(DIAG308_REL_HSA, NULL); | |
644 | } | |
645 | ||
646 | MODULE_AUTHOR("Copyright IBM Corp. 2003,2007"); | |
647 | MODULE_DESCRIPTION("zcore module for zfcpdump support"); | |
648 | MODULE_LICENSE("GPL"); | |
649 | ||
650 | subsys_initcall(zcore_init); | |
651 | module_exit(zcore_exit); |