Commit | Line | Data |
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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 | * | |
099b7651 | 8 | * Copyright IBM Corp. 2003,2008 |
411ed322 MH |
9 | * Author(s): Michael Holzheu |
10 | */ | |
11 | ||
17159dc6 MH |
12 | #define KMSG_COMPONENT "zdump" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
411ed322 MH |
15 | #include <linux/init.h> |
16 | #include <linux/miscdevice.h> | |
411ed322 MH |
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> | |
159d1ff8 | 26 | #include <asm/checksum.h> |
763968e2 | 27 | #include "sclp.h" |
411ed322 MH |
28 | |
29 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
411ed322 MH |
30 | |
31 | #define TO_USER 0 | |
32 | #define TO_KERNEL 1 | |
12e0c95e | 33 | #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ |
411ed322 MH |
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 | ||
099b7651 FM |
51 | struct ipib_info { |
52 | unsigned long ipib; | |
53 | u32 checksum; | |
54 | } __attribute__((packed)); | |
55 | ||
411ed322 MH |
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; | |
12e0c95e | 61 | static struct dentry *zcore_memmap_file; |
099b7651 FM |
62 | static struct dentry *zcore_reipl_file; |
63 | static struct ipl_parameter_block *ipl_block; | |
411ed322 MH |
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; | |
53a0868c | 154 | flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */ |
411ed322 MH |
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) | |
53a0868c MH |
161 | : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1), |
162 | "+d" (_len2), "=m" (*((long*)dest)) | |
163 | : "m" (*((long*)src)) | |
411ed322 MH |
164 | : "cc", "memory"); |
165 | __raw_local_irq_ssm(flags); | |
166 | ||
167 | return rc; | |
168 | } | |
169 | ||
d9f774d4 | 170 | static int memcpy_real_user(void __user *dest, unsigned long src, size_t count) |
411ed322 MH |
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); | |
2a062ab4 | 236 | if (!sa) |
411ed322 | 237 | return -ENOMEM; |
411ed322 | 238 | if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) { |
2a062ab4 | 239 | TRACE("could not copy from HSA\n"); |
411ed322 MH |
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; | |
e86a6ed6 | 277 | struct cpuid cpu_id; |
411ed322 | 278 | u32 arch_id; |
ce444823 | 279 | u32 volnr; |
411ed322 | 280 | u32 build_arch; |
ce444823 | 281 | u64 rmem_size; |
411ed322 MH |
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 | ||
5c81cdbe | 481 | static const struct file_operations zcore_fops = { |
411ed322 MH |
482 | .owner = THIS_MODULE, |
483 | .llseek = zcore_lseek, | |
484 | .read = zcore_read, | |
485 | .open = zcore_open, | |
486 | .release = zcore_release, | |
487 | }; | |
488 | ||
12e0c95e FM |
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 | ||
099b7651 FM |
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 | ||
411ed322 MH |
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 | { | |
2a062ab4 MH |
597 | int rc; |
598 | ||
411ed322 MH |
599 | switch (arch) { |
600 | case ARCH_S390X: | |
17159dc6 | 601 | pr_alert("DETECTED 'S390X (64 bit) OS'\n"); |
411ed322 MH |
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: | |
17159dc6 | 607 | pr_alert("DETECTED 'S390 (32 bit) OS'\n"); |
411ed322 MH |
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: | |
17159dc6 | 613 | pr_alert("0x%x is an unknown architecture.\n",arch); |
411ed322 MH |
614 | return -EINVAL; |
615 | } | |
616 | sys_info.arch = arch; | |
2a062ab4 MH |
617 | rc = init_cpu_info(arch); |
618 | if (rc) | |
619 | return rc; | |
411ed322 MH |
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) { | |
2a062ab4 | 631 | TRACE("Could not determine HSA size\n"); |
411ed322 MH |
632 | return rc; |
633 | } | |
634 | act_hsa_size = (rc - 1) * PAGE_SIZE; | |
635 | if (act_hsa_size < ZFCPDUMP_HSA_SIZE) { | |
2a062ab4 | 636 | TRACE("HSA size too small: %i\n", act_hsa_size); |
411ed322 MH |
637 | return -EINVAL; |
638 | } | |
639 | return 0; | |
640 | } | |
641 | ||
12e0c95e FM |
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) | |
411ed322 | 662 | { |
12e0c95e FM |
663 | int rc; |
664 | unsigned long memory = 0; | |
665 | ||
411ed322 MH |
666 | if (arch == ARCH_S390X) |
667 | hdr->arch_id = DUMP_ARCH_S390X; | |
668 | else | |
669 | hdr->arch_id = DUMP_ARCH_S390; | |
12e0c95e FM |
670 | rc = get_mem_size(&memory); |
671 | if (rc) | |
672 | return rc; | |
673 | hdr->mem_size = memory; | |
674 | hdr->rmem_size = memory; | |
411ed322 | 675 | hdr->mem_end = sys_info.mem_size; |
12e0c95e | 676 | hdr->num_pages = memory / PAGE_SIZE; |
411ed322 MH |
677 | hdr->tod = get_clock(); |
678 | get_cpu_id(&hdr->cpu_id); | |
12e0c95e | 679 | return 0; |
411ed322 MH |
680 | } |
681 | ||
099b7651 FM |
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 | } | |
159d1ff8 FM |
707 | if (csum_partial(ipl_block, ipl_block->hdr.len, 0) != |
708 | ipib_info.checksum) { | |
099b7651 FM |
709 | TRACE("Checksum does not match\n"); |
710 | free_page((unsigned long) ipl_block); | |
711 | ipl_block = NULL; | |
712 | } | |
713 | return 0; | |
714 | } | |
715 | ||
411ed322 MH |
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 | ||
763968e2 | 732 | rc = sclp_sdias_init(); |
411ed322 MH |
733 | if (rc) |
734 | goto fail; | |
735 | ||
736 | rc = check_sdias(); | |
2a062ab4 | 737 | if (rc) |
411ed322 | 738 | goto fail; |
411ed322 MH |
739 | |
740 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
2a062ab4 | 741 | if (rc) |
411ed322 | 742 | goto fail; |
411ed322 MH |
743 | |
744 | #ifndef __s390x__ | |
745 | if (arch == ARCH_S390X) { | |
17159dc6 MH |
746 | pr_alert("The 32-bit dump tool cannot be used for a " |
747 | "64-bit system\n"); | |
411ed322 MH |
748 | rc = -EINVAL; |
749 | goto fail; | |
750 | } | |
751 | #endif | |
752 | ||
753 | rc = sys_info_init(arch); | |
2a062ab4 | 754 | if (rc) |
411ed322 | 755 | goto fail; |
411ed322 | 756 | |
12e0c95e FM |
757 | rc = zcore_header_init(arch, &zcore_header); |
758 | if (rc) | |
759 | goto fail; | |
411ed322 | 760 | |
099b7651 FM |
761 | rc = zcore_reipl_init(); |
762 | if (rc) | |
763 | goto fail; | |
764 | ||
411ed322 MH |
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) { | |
411ed322 | 773 | rc = -ENOMEM; |
12e0c95e FM |
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; | |
411ed322 | 781 | } |
099b7651 FM |
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 | } | |
411ed322 MH |
788 | hsa_available = 1; |
789 | return 0; | |
790 | ||
099b7651 FM |
791 | fail_memmap_file: |
792 | debugfs_remove(zcore_memmap_file); | |
12e0c95e FM |
793 | fail_file: |
794 | debugfs_remove(zcore_file); | |
795 | fail_dir: | |
796 | debugfs_remove(zcore_dir); | |
411ed322 MH |
797 | fail: |
798 | diag308(DIAG308_REL_HSA, NULL); | |
799 | return rc; | |
800 | } | |
801 | ||
411ed322 MH |
802 | static void __exit zcore_exit(void) |
803 | { | |
804 | debug_unregister(zcore_dbf); | |
763968e2 | 805 | sclp_sdias_exit(); |
099b7651 FM |
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); | |
411ed322 MH |
811 | diag308(DIAG308_REL_HSA, NULL); |
812 | } | |
813 | ||
099b7651 | 814 | MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); |
411ed322 MH |
815 | MODULE_DESCRIPTION("zcore module for zfcpdump support"); |
816 | MODULE_LICENSE("GPL"); | |
817 | ||
818 | subsys_initcall(zcore_init); | |
819 | module_exit(zcore_exit); |