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 | * | |
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> | |
763968e2 | 24 | #include "sclp.h" |
411ed322 MH |
25 | |
26 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
27 | #define MSG(x...) printk( KERN_ALERT x ) | |
28 | #define ERROR_MSG(x...) printk ( KERN_ALERT "DUMP: " x ) | |
29 | ||
30 | #define TO_USER 0 | |
31 | #define TO_KERNEL 1 | |
12e0c95e | 32 | #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ |
411ed322 MH |
33 | |
34 | enum arch_id { | |
35 | ARCH_S390 = 0, | |
36 | ARCH_S390X = 1, | |
37 | }; | |
38 | ||
39 | /* dump system info */ | |
40 | ||
41 | struct sys_info { | |
42 | enum arch_id arch; | |
43 | unsigned long sa_base; | |
44 | u32 sa_size; | |
45 | int cpu_map[NR_CPUS]; | |
46 | unsigned long mem_size; | |
47 | union save_area lc_mask; | |
48 | }; | |
49 | ||
50 | static struct sys_info sys_info; | |
51 | static struct debug_info *zcore_dbf; | |
52 | static int hsa_available; | |
53 | static struct dentry *zcore_dir; | |
54 | static struct dentry *zcore_file; | |
12e0c95e | 55 | static struct dentry *zcore_memmap_file; |
411ed322 MH |
56 | |
57 | /* | |
58 | * Copy memory from HSA to kernel or user memory (not reentrant): | |
59 | * | |
60 | * @dest: Kernel or user buffer where memory should be copied to | |
61 | * @src: Start address within HSA where data should be copied | |
62 | * @count: Size of buffer, which should be copied | |
63 | * @mode: Either TO_KERNEL or TO_USER | |
64 | */ | |
65 | static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) | |
66 | { | |
67 | int offs, blk_num; | |
68 | static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
69 | ||
70 | if (count == 0) | |
71 | return 0; | |
72 | ||
73 | /* copy first block */ | |
74 | offs = 0; | |
75 | if ((src % PAGE_SIZE) != 0) { | |
76 | blk_num = src / PAGE_SIZE + 2; | |
77 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
78 | TRACE("sclp_sdias_copy() failed\n"); | |
79 | return -EIO; | |
80 | } | |
81 | offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); | |
82 | if (mode == TO_USER) { | |
83 | if (copy_to_user((__force __user void*) dest, | |
84 | buf + (src % PAGE_SIZE), offs)) | |
85 | return -EFAULT; | |
86 | } else | |
87 | memcpy(dest, buf + (src % PAGE_SIZE), offs); | |
88 | } | |
89 | if (offs == count) | |
90 | goto out; | |
91 | ||
92 | /* copy middle */ | |
93 | for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { | |
94 | blk_num = (src + offs) / PAGE_SIZE + 2; | |
95 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
96 | TRACE("sclp_sdias_copy() failed\n"); | |
97 | return -EIO; | |
98 | } | |
99 | if (mode == TO_USER) { | |
100 | if (copy_to_user((__force __user void*) dest + offs, | |
101 | buf, PAGE_SIZE)) | |
102 | return -EFAULT; | |
103 | } else | |
104 | memcpy(dest + offs, buf, PAGE_SIZE); | |
105 | } | |
106 | if (offs == count) | |
107 | goto out; | |
108 | ||
109 | /* copy last block */ | |
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, buf, | |
117 | PAGE_SIZE)) | |
118 | return -EFAULT; | |
119 | } else | |
120 | memcpy(dest + offs, buf, count - offs); | |
121 | out: | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) | |
126 | { | |
127 | return memcpy_hsa((void __force *) dest, src, count, TO_USER); | |
128 | } | |
129 | ||
130 | static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) | |
131 | { | |
132 | return memcpy_hsa(dest, src, count, TO_KERNEL); | |
133 | } | |
134 | ||
135 | static int memcpy_real(void *dest, unsigned long src, size_t count) | |
136 | { | |
137 | unsigned long flags; | |
138 | int rc = -EFAULT; | |
139 | register unsigned long _dest asm("2") = (unsigned long) dest; | |
140 | register unsigned long _len1 asm("3") = (unsigned long) count; | |
141 | register unsigned long _src asm("4") = src; | |
142 | register unsigned long _len2 asm("5") = (unsigned long) count; | |
143 | ||
144 | if (count == 0) | |
145 | return 0; | |
53a0868c | 146 | flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */ |
411ed322 MH |
147 | asm volatile ( |
148 | "0: mvcle %1,%2,0x0\n" | |
149 | "1: jo 0b\n" | |
150 | " lhi %0,0x0\n" | |
151 | "2:\n" | |
152 | EX_TABLE(1b,2b) | |
53a0868c MH |
153 | : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1), |
154 | "+d" (_len2), "=m" (*((long*)dest)) | |
155 | : "m" (*((long*)src)) | |
411ed322 MH |
156 | : "cc", "memory"); |
157 | __raw_local_irq_ssm(flags); | |
158 | ||
159 | return rc; | |
160 | } | |
161 | ||
d9f774d4 | 162 | static int memcpy_real_user(void __user *dest, unsigned long src, size_t count) |
411ed322 MH |
163 | { |
164 | static char buf[4096]; | |
165 | int offs = 0, size; | |
166 | ||
167 | while (offs < count) { | |
168 | size = min(sizeof(buf), count - offs); | |
169 | if (memcpy_real(buf, src + offs, size)) | |
170 | return -EFAULT; | |
171 | if (copy_to_user(dest + offs, buf, size)) | |
172 | return -EFAULT; | |
173 | offs += size; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | #ifdef __s390x__ | |
179 | /* | |
180 | * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info | |
181 | */ | |
182 | static void __init s390x_to_s390_regs(union save_area *out, union save_area *in, | |
183 | int cpu) | |
184 | { | |
185 | int i; | |
186 | ||
187 | for (i = 0; i < 16; i++) { | |
188 | out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff; | |
189 | out->s390.acc_regs[i] = in->s390x.acc_regs[i]; | |
190 | out->s390.ctrl_regs[i] = | |
191 | in->s390x.ctrl_regs[i] & 0x00000000ffffffff; | |
192 | } | |
193 | /* locore for 31 bit has only space for fpregs 0,2,4,6 */ | |
194 | out->s390.fp_regs[0] = in->s390x.fp_regs[0]; | |
195 | out->s390.fp_regs[1] = in->s390x.fp_regs[2]; | |
196 | out->s390.fp_regs[2] = in->s390x.fp_regs[4]; | |
197 | out->s390.fp_regs[3] = in->s390x.fp_regs[6]; | |
198 | memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4); | |
199 | out->s390.psw[1] |= 0x8; /* set bit 12 */ | |
200 | memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4); | |
201 | out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */ | |
202 | out->s390.pref_reg = in->s390x.pref_reg; | |
203 | out->s390.timer = in->s390x.timer; | |
204 | out->s390.clk_cmp = in->s390x.clk_cmp; | |
205 | } | |
206 | ||
207 | static void __init s390x_to_s390_save_areas(void) | |
208 | { | |
209 | int i = 1; | |
210 | static union save_area tmp; | |
211 | ||
212 | while (zfcpdump_save_areas[i]) { | |
213 | s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i); | |
214 | memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp)); | |
215 | i++; | |
216 | } | |
217 | } | |
218 | ||
219 | #endif /* __s390x__ */ | |
220 | ||
221 | static int __init init_cpu_info(enum arch_id arch) | |
222 | { | |
223 | union save_area *sa; | |
224 | ||
225 | /* get info for boot cpu from lowcore, stored in the HSA */ | |
226 | ||
227 | sa = kmalloc(sizeof(*sa), GFP_KERNEL); | |
2a062ab4 | 228 | if (!sa) |
411ed322 | 229 | return -ENOMEM; |
411ed322 | 230 | if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) { |
2a062ab4 | 231 | TRACE("could not copy from HSA\n"); |
411ed322 MH |
232 | kfree(sa); |
233 | return -EIO; | |
234 | } | |
235 | zfcpdump_save_areas[0] = sa; | |
236 | ||
237 | #ifdef __s390x__ | |
238 | /* convert s390x regs to s390, if we are dumping an s390 Linux */ | |
239 | ||
240 | if (arch == ARCH_S390) | |
241 | s390x_to_s390_save_areas(); | |
242 | #endif | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static DEFINE_MUTEX(zcore_mutex); | |
248 | ||
249 | #define DUMP_VERSION 0x3 | |
250 | #define DUMP_MAGIC 0xa8190173618f23fdULL | |
251 | #define DUMP_ARCH_S390X 2 | |
252 | #define DUMP_ARCH_S390 1 | |
253 | #define HEADER_SIZE 4096 | |
254 | ||
255 | /* dump header dumped according to s390 crash dump format */ | |
256 | ||
257 | struct zcore_header { | |
258 | u64 magic; | |
259 | u32 version; | |
260 | u32 header_size; | |
261 | u32 dump_level; | |
262 | u32 page_size; | |
263 | u64 mem_size; | |
264 | u64 mem_start; | |
265 | u64 mem_end; | |
266 | u32 num_pages; | |
267 | u32 pad1; | |
268 | u64 tod; | |
269 | cpuid_t cpu_id; | |
270 | u32 arch_id; | |
ce444823 | 271 | u32 volnr; |
411ed322 | 272 | u32 build_arch; |
ce444823 | 273 | u64 rmem_size; |
411ed322 MH |
274 | char pad2[4016]; |
275 | } __attribute__((packed,__aligned__(16))); | |
276 | ||
277 | static struct zcore_header zcore_header = { | |
278 | .magic = DUMP_MAGIC, | |
279 | .version = DUMP_VERSION, | |
280 | .header_size = 4096, | |
281 | .dump_level = 0, | |
282 | .page_size = PAGE_SIZE, | |
283 | .mem_start = 0, | |
284 | #ifdef __s390x__ | |
285 | .build_arch = DUMP_ARCH_S390X, | |
286 | #else | |
287 | .build_arch = DUMP_ARCH_S390, | |
288 | #endif | |
289 | }; | |
290 | ||
291 | /* | |
292 | * Copy lowcore info to buffer. Use map in order to copy only register parts. | |
293 | * | |
294 | * @buf: User buffer | |
295 | * @sa: Pointer to save area | |
296 | * @sa_off: Offset in save area to copy | |
297 | * @len: Number of bytes to copy | |
298 | */ | |
299 | static int copy_lc(void __user *buf, void *sa, int sa_off, int len) | |
300 | { | |
301 | int i; | |
302 | char *lc_mask = (char*)&sys_info.lc_mask; | |
303 | ||
304 | for (i = 0; i < len; i++) { | |
305 | if (!lc_mask[i + sa_off]) | |
306 | continue; | |
307 | if (copy_to_user(buf + i, sa + sa_off + i, 1)) | |
308 | return -EFAULT; | |
309 | } | |
310 | return 0; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Copy lowcores info to memory, if necessary | |
315 | * | |
316 | * @buf: User buffer | |
317 | * @addr: Start address of buffer in dump memory | |
318 | * @count: Size of buffer | |
319 | */ | |
320 | static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) | |
321 | { | |
322 | unsigned long end; | |
323 | int i = 0; | |
324 | ||
325 | if (count == 0) | |
326 | return 0; | |
327 | ||
328 | end = start + count; | |
329 | while (zfcpdump_save_areas[i]) { | |
330 | unsigned long cp_start, cp_end; /* copy range */ | |
331 | unsigned long sa_start, sa_end; /* save area range */ | |
332 | unsigned long prefix; | |
333 | unsigned long sa_off, len, buf_off; | |
334 | ||
335 | if (sys_info.arch == ARCH_S390) | |
336 | prefix = zfcpdump_save_areas[i]->s390.pref_reg; | |
337 | else | |
338 | prefix = zfcpdump_save_areas[i]->s390x.pref_reg; | |
339 | ||
340 | sa_start = prefix + sys_info.sa_base; | |
341 | sa_end = prefix + sys_info.sa_base + sys_info.sa_size; | |
342 | ||
343 | if ((end < sa_start) || (start > sa_end)) | |
344 | goto next; | |
345 | cp_start = max(start, sa_start); | |
346 | cp_end = min(end, sa_end); | |
347 | ||
348 | buf_off = cp_start - start; | |
349 | sa_off = cp_start - sa_start; | |
350 | len = cp_end - cp_start; | |
351 | ||
352 | TRACE("copy_lc for: %lx\n", start); | |
353 | if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len)) | |
354 | return -EFAULT; | |
355 | next: | |
356 | i++; | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Read routine for zcore character device | |
363 | * First 4K are dump header | |
364 | * Next 32MB are HSA Memory | |
365 | * Rest is read from absolute Memory | |
366 | */ | |
367 | static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, | |
368 | loff_t *ppos) | |
369 | { | |
370 | unsigned long mem_start; /* Start address in memory */ | |
371 | size_t mem_offs; /* Offset in dump memory */ | |
372 | size_t hdr_count; /* Size of header part of output buffer */ | |
373 | size_t size; | |
374 | int rc; | |
375 | ||
376 | mutex_lock(&zcore_mutex); | |
377 | ||
378 | if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { | |
379 | rc = -EINVAL; | |
380 | goto fail; | |
381 | } | |
382 | ||
383 | count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); | |
384 | ||
385 | /* Copy dump header */ | |
386 | if (*ppos < HEADER_SIZE) { | |
387 | size = min(count, (size_t) (HEADER_SIZE - *ppos)); | |
388 | if (copy_to_user(buf, &zcore_header + *ppos, size)) { | |
389 | rc = -EFAULT; | |
390 | goto fail; | |
391 | } | |
392 | hdr_count = size; | |
393 | mem_start = 0; | |
394 | } else { | |
395 | hdr_count = 0; | |
396 | mem_start = *ppos - HEADER_SIZE; | |
397 | } | |
398 | ||
399 | mem_offs = 0; | |
400 | ||
401 | /* Copy from HSA data */ | |
402 | if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) { | |
403 | size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE | |
404 | - mem_start)); | |
405 | rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); | |
406 | if (rc) | |
407 | goto fail; | |
408 | ||
409 | mem_offs += size; | |
410 | } | |
411 | ||
412 | /* Copy from real mem */ | |
413 | size = count - mem_offs - hdr_count; | |
414 | rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs, | |
415 | size); | |
416 | if (rc) | |
417 | goto fail; | |
418 | ||
419 | /* | |
420 | * Since s390 dump analysis tools like lcrash or crash | |
421 | * expect register sets in the prefix pages of the cpus, | |
422 | * we copy them into the read buffer, if necessary. | |
423 | * buf + hdr_count: Start of memory part of output buffer | |
424 | * mem_start: Start memory address to copy from | |
425 | * count - hdr_count: Size of memory area to copy | |
426 | */ | |
427 | if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { | |
428 | rc = -EFAULT; | |
429 | goto fail; | |
430 | } | |
431 | *ppos += count; | |
432 | fail: | |
433 | mutex_unlock(&zcore_mutex); | |
434 | return (rc < 0) ? rc : count; | |
435 | } | |
436 | ||
437 | static int zcore_open(struct inode *inode, struct file *filp) | |
438 | { | |
439 | if (!hsa_available) | |
440 | return -ENODATA; | |
441 | else | |
442 | return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; | |
443 | } | |
444 | ||
445 | static int zcore_release(struct inode *inode, struct file *filep) | |
446 | { | |
447 | diag308(DIAG308_REL_HSA, NULL); | |
448 | hsa_available = 0; | |
449 | return 0; | |
450 | } | |
451 | ||
452 | static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) | |
453 | { | |
454 | loff_t rc; | |
455 | ||
456 | mutex_lock(&zcore_mutex); | |
457 | switch (orig) { | |
458 | case 0: | |
459 | file->f_pos = offset; | |
460 | rc = file->f_pos; | |
461 | break; | |
462 | case 1: | |
463 | file->f_pos += offset; | |
464 | rc = file->f_pos; | |
465 | break; | |
466 | default: | |
467 | rc = -EINVAL; | |
468 | } | |
469 | mutex_unlock(&zcore_mutex); | |
470 | return rc; | |
471 | } | |
472 | ||
5c81cdbe | 473 | static const struct file_operations zcore_fops = { |
411ed322 MH |
474 | .owner = THIS_MODULE, |
475 | .llseek = zcore_lseek, | |
476 | .read = zcore_read, | |
477 | .open = zcore_open, | |
478 | .release = zcore_release, | |
479 | }; | |
480 | ||
12e0c95e FM |
481 | static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, |
482 | size_t count, loff_t *ppos) | |
483 | { | |
484 | return simple_read_from_buffer(buf, count, ppos, filp->private_data, | |
485 | MEMORY_CHUNKS * CHUNK_INFO_SIZE); | |
486 | } | |
487 | ||
488 | static int zcore_memmap_open(struct inode *inode, struct file *filp) | |
489 | { | |
490 | int i; | |
491 | char *buf; | |
492 | struct mem_chunk *chunk_array; | |
493 | ||
494 | chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), | |
495 | GFP_KERNEL); | |
496 | if (!chunk_array) | |
497 | return -ENOMEM; | |
498 | detect_memory_layout(chunk_array); | |
499 | buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL); | |
500 | if (!buf) { | |
501 | kfree(chunk_array); | |
502 | return -ENOMEM; | |
503 | } | |
504 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
505 | sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ", | |
506 | (unsigned long long) chunk_array[i].addr, | |
507 | (unsigned long long) chunk_array[i].size); | |
508 | if (chunk_array[i].size == 0) | |
509 | break; | |
510 | } | |
511 | kfree(chunk_array); | |
512 | filp->private_data = buf; | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static int zcore_memmap_release(struct inode *inode, struct file *filp) | |
517 | { | |
518 | kfree(filp->private_data); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | static const struct file_operations zcore_memmap_fops = { | |
523 | .owner = THIS_MODULE, | |
524 | .read = zcore_memmap_read, | |
525 | .open = zcore_memmap_open, | |
526 | .release = zcore_memmap_release, | |
527 | }; | |
528 | ||
411ed322 MH |
529 | |
530 | static void __init set_s390_lc_mask(union save_area *map) | |
531 | { | |
532 | memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save)); | |
533 | memset(&map->s390.timer, 0xff, sizeof(map->s390.timer)); | |
534 | memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp)); | |
535 | memset(&map->s390.psw, 0xff, sizeof(map->s390.psw)); | |
536 | memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg)); | |
537 | memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs)); | |
538 | memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs)); | |
539 | memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs)); | |
540 | memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs)); | |
541 | } | |
542 | ||
543 | static void __init set_s390x_lc_mask(union save_area *map) | |
544 | { | |
545 | memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs)); | |
546 | memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs)); | |
547 | memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw)); | |
548 | memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg)); | |
549 | memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg)); | |
550 | memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg)); | |
551 | memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer)); | |
552 | memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp)); | |
553 | memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs)); | |
554 | memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs)); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Initialize dump globals for a given architecture | |
559 | */ | |
560 | static int __init sys_info_init(enum arch_id arch) | |
561 | { | |
2a062ab4 MH |
562 | int rc; |
563 | ||
411ed322 MH |
564 | switch (arch) { |
565 | case ARCH_S390X: | |
566 | MSG("DETECTED 'S390X (64 bit) OS'\n"); | |
567 | sys_info.sa_base = SAVE_AREA_BASE_S390X; | |
568 | sys_info.sa_size = sizeof(struct save_area_s390x); | |
569 | set_s390x_lc_mask(&sys_info.lc_mask); | |
570 | break; | |
571 | case ARCH_S390: | |
572 | MSG("DETECTED 'S390 (32 bit) OS'\n"); | |
573 | sys_info.sa_base = SAVE_AREA_BASE_S390; | |
574 | sys_info.sa_size = sizeof(struct save_area_s390); | |
575 | set_s390_lc_mask(&sys_info.lc_mask); | |
576 | break; | |
577 | default: | |
578 | ERROR_MSG("unknown architecture 0x%x.\n",arch); | |
579 | return -EINVAL; | |
580 | } | |
581 | sys_info.arch = arch; | |
2a062ab4 MH |
582 | rc = init_cpu_info(arch); |
583 | if (rc) | |
584 | return rc; | |
411ed322 MH |
585 | sys_info.mem_size = real_memory_size; |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | static int __init check_sdias(void) | |
591 | { | |
592 | int rc, act_hsa_size; | |
593 | ||
594 | rc = sclp_sdias_blk_count(); | |
595 | if (rc < 0) { | |
2a062ab4 | 596 | TRACE("Could not determine HSA size\n"); |
411ed322 MH |
597 | return rc; |
598 | } | |
599 | act_hsa_size = (rc - 1) * PAGE_SIZE; | |
600 | if (act_hsa_size < ZFCPDUMP_HSA_SIZE) { | |
2a062ab4 | 601 | TRACE("HSA size too small: %i\n", act_hsa_size); |
411ed322 MH |
602 | return -EINVAL; |
603 | } | |
604 | return 0; | |
605 | } | |
606 | ||
12e0c95e FM |
607 | static int __init get_mem_size(unsigned long *mem) |
608 | { | |
609 | int i; | |
610 | struct mem_chunk *chunk_array; | |
611 | ||
612 | chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), | |
613 | GFP_KERNEL); | |
614 | if (!chunk_array) | |
615 | return -ENOMEM; | |
616 | detect_memory_layout(chunk_array); | |
617 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
618 | if (chunk_array[i].size == 0) | |
619 | break; | |
620 | *mem += chunk_array[i].size; | |
621 | } | |
622 | kfree(chunk_array); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static int __init zcore_header_init(int arch, struct zcore_header *hdr) | |
411ed322 | 627 | { |
12e0c95e FM |
628 | int rc; |
629 | unsigned long memory = 0; | |
630 | ||
411ed322 MH |
631 | if (arch == ARCH_S390X) |
632 | hdr->arch_id = DUMP_ARCH_S390X; | |
633 | else | |
634 | hdr->arch_id = DUMP_ARCH_S390; | |
12e0c95e FM |
635 | rc = get_mem_size(&memory); |
636 | if (rc) | |
637 | return rc; | |
638 | hdr->mem_size = memory; | |
639 | hdr->rmem_size = memory; | |
411ed322 | 640 | hdr->mem_end = sys_info.mem_size; |
12e0c95e | 641 | hdr->num_pages = memory / PAGE_SIZE; |
411ed322 MH |
642 | hdr->tod = get_clock(); |
643 | get_cpu_id(&hdr->cpu_id); | |
12e0c95e | 644 | return 0; |
411ed322 MH |
645 | } |
646 | ||
411ed322 MH |
647 | static int __init zcore_init(void) |
648 | { | |
649 | unsigned char arch; | |
650 | int rc; | |
651 | ||
652 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) | |
653 | return -ENODATA; | |
654 | ||
655 | zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); | |
656 | debug_register_view(zcore_dbf, &debug_sprintf_view); | |
657 | debug_set_level(zcore_dbf, 6); | |
658 | ||
659 | TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); | |
660 | TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); | |
661 | TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); | |
662 | ||
763968e2 | 663 | rc = sclp_sdias_init(); |
411ed322 MH |
664 | if (rc) |
665 | goto fail; | |
666 | ||
667 | rc = check_sdias(); | |
2a062ab4 | 668 | if (rc) |
411ed322 | 669 | goto fail; |
411ed322 MH |
670 | |
671 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
2a062ab4 | 672 | if (rc) |
411ed322 | 673 | goto fail; |
411ed322 MH |
674 | |
675 | #ifndef __s390x__ | |
676 | if (arch == ARCH_S390X) { | |
677 | ERROR_MSG("32 bit dumper can't dump 64 bit system!\n"); | |
678 | rc = -EINVAL; | |
679 | goto fail; | |
680 | } | |
681 | #endif | |
682 | ||
683 | rc = sys_info_init(arch); | |
2a062ab4 | 684 | if (rc) |
411ed322 | 685 | goto fail; |
411ed322 | 686 | |
12e0c95e FM |
687 | rc = zcore_header_init(arch, &zcore_header); |
688 | if (rc) | |
689 | goto fail; | |
411ed322 MH |
690 | |
691 | zcore_dir = debugfs_create_dir("zcore" , NULL); | |
692 | if (!zcore_dir) { | |
693 | rc = -ENOMEM; | |
694 | goto fail; | |
695 | } | |
696 | zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, | |
697 | &zcore_fops); | |
698 | if (!zcore_file) { | |
411ed322 | 699 | rc = -ENOMEM; |
12e0c95e FM |
700 | goto fail_dir; |
701 | } | |
702 | zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, | |
703 | NULL, &zcore_memmap_fops); | |
704 | if (!zcore_memmap_file) { | |
705 | rc = -ENOMEM; | |
706 | goto fail_file; | |
411ed322 MH |
707 | } |
708 | hsa_available = 1; | |
709 | return 0; | |
710 | ||
12e0c95e FM |
711 | fail_file: |
712 | debugfs_remove(zcore_file); | |
713 | fail_dir: | |
714 | debugfs_remove(zcore_dir); | |
411ed322 MH |
715 | fail: |
716 | diag308(DIAG308_REL_HSA, NULL); | |
717 | return rc; | |
718 | } | |
719 | ||
411ed322 MH |
720 | static void __exit zcore_exit(void) |
721 | { | |
722 | debug_unregister(zcore_dbf); | |
763968e2 | 723 | sclp_sdias_exit(); |
411ed322 MH |
724 | diag308(DIAG308_REL_HSA, NULL); |
725 | } | |
726 | ||
727 | MODULE_AUTHOR("Copyright IBM Corp. 2003,2007"); | |
728 | MODULE_DESCRIPTION("zcore module for zfcpdump support"); | |
729 | MODULE_LICENSE("GPL"); | |
730 | ||
731 | subsys_initcall(zcore_init); | |
732 | module_exit(zcore_exit); |