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9#include <linux/crash_core.h>
10#include <linux/utsname.h>
11#include <linux/vmalloc.h>
12
13#include <asm/page.h>
14#include <asm/sections.h>
15
16
17static unsigned char *vmcoreinfo_data;
18static size_t vmcoreinfo_size;
19u32 *vmcoreinfo_note;
20
21
22static unsigned char *vmcoreinfo_data_safecopy;
23
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25
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33
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35
36
37
38static int __init parse_crashkernel_mem(char *cmdline,
39 unsigned long long system_ram,
40 unsigned long long *crash_size,
41 unsigned long long *crash_base)
42{
43 char *cur = cmdline, *tmp;
44
45
46 do {
47 unsigned long long start, end = ULLONG_MAX, size;
48
49
50 start = memparse(cur, &tmp);
51 if (cur == tmp) {
52 pr_warn("crashkernel: Memory value expected\n");
53 return -EINVAL;
54 }
55 cur = tmp;
56 if (*cur != '-') {
57 pr_warn("crashkernel: '-' expected\n");
58 return -EINVAL;
59 }
60 cur++;
61
62
63 if (*cur != ':') {
64 end = memparse(cur, &tmp);
65 if (cur == tmp) {
66 pr_warn("crashkernel: Memory value expected\n");
67 return -EINVAL;
68 }
69 cur = tmp;
70 if (end <= start) {
71 pr_warn("crashkernel: end <= start\n");
72 return -EINVAL;
73 }
74 }
75
76 if (*cur != ':') {
77 pr_warn("crashkernel: ':' expected\n");
78 return -EINVAL;
79 }
80 cur++;
81
82 size = memparse(cur, &tmp);
83 if (cur == tmp) {
84 pr_warn("Memory value expected\n");
85 return -EINVAL;
86 }
87 cur = tmp;
88 if (size >= system_ram) {
89 pr_warn("crashkernel: invalid size\n");
90 return -EINVAL;
91 }
92
93
94 if (system_ram >= start && system_ram < end) {
95 *crash_size = size;
96 break;
97 }
98 } while (*cur++ == ',');
99
100 if (*crash_size > 0) {
101 while (*cur && *cur != ' ' && *cur != '@')
102 cur++;
103 if (*cur == '@') {
104 cur++;
105 *crash_base = memparse(cur, &tmp);
106 if (cur == tmp) {
107 pr_warn("Memory value expected after '@'\n");
108 return -EINVAL;
109 }
110 }
111 }
112
113 return 0;
114}
115
116
117
118
119
120
121
122
123static int __init parse_crashkernel_simple(char *cmdline,
124 unsigned long long *crash_size,
125 unsigned long long *crash_base)
126{
127 char *cur = cmdline;
128
129 *crash_size = memparse(cmdline, &cur);
130 if (cmdline == cur) {
131 pr_warn("crashkernel: memory value expected\n");
132 return -EINVAL;
133 }
134
135 if (*cur == '@')
136 *crash_base = memparse(cur+1, &cur);
137 else if (*cur != ' ' && *cur != '\0') {
138 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
139 return -EINVAL;
140 }
141
142 return 0;
143}
144
145#define SUFFIX_HIGH 0
146#define SUFFIX_LOW 1
147#define SUFFIX_NULL 2
148static __initdata char *suffix_tbl[] = {
149 [SUFFIX_HIGH] = ",high",
150 [SUFFIX_LOW] = ",low",
151 [SUFFIX_NULL] = NULL,
152};
153
154
155
156
157
158
159
160
161static int __init parse_crashkernel_suffix(char *cmdline,
162 unsigned long long *crash_size,
163 const char *suffix)
164{
165 char *cur = cmdline;
166
167 *crash_size = memparse(cmdline, &cur);
168 if (cmdline == cur) {
169 pr_warn("crashkernel: memory value expected\n");
170 return -EINVAL;
171 }
172
173
174 if (strncmp(cur, suffix, strlen(suffix))) {
175 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
176 return -EINVAL;
177 }
178 cur += strlen(suffix);
179 if (*cur != ' ' && *cur != '\0') {
180 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
181 return -EINVAL;
182 }
183
184 return 0;
185}
186
187static __init char *get_last_crashkernel(char *cmdline,
188 const char *name,
189 const char *suffix)
190{
191 char *p = cmdline, *ck_cmdline = NULL;
192
193
194 p = strstr(p, name);
195 while (p) {
196 char *end_p = strchr(p, ' ');
197 char *q;
198
199 if (!end_p)
200 end_p = p + strlen(p);
201
202 if (!suffix) {
203 int i;
204
205
206 for (i = 0; suffix_tbl[i]; i++) {
207 q = end_p - strlen(suffix_tbl[i]);
208 if (!strncmp(q, suffix_tbl[i],
209 strlen(suffix_tbl[i])))
210 goto next;
211 }
212 ck_cmdline = p;
213 } else {
214 q = end_p - strlen(suffix);
215 if (!strncmp(q, suffix, strlen(suffix)))
216 ck_cmdline = p;
217 }
218next:
219 p = strstr(p+1, name);
220 }
221
222 if (!ck_cmdline)
223 return NULL;
224
225 return ck_cmdline;
226}
227
228static int __init __parse_crashkernel(char *cmdline,
229 unsigned long long system_ram,
230 unsigned long long *crash_size,
231 unsigned long long *crash_base,
232 const char *name,
233 const char *suffix)
234{
235 char *first_colon, *first_space;
236 char *ck_cmdline;
237
238 BUG_ON(!crash_size || !crash_base);
239 *crash_size = 0;
240 *crash_base = 0;
241
242 ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
243
244 if (!ck_cmdline)
245 return -EINVAL;
246
247 ck_cmdline += strlen(name);
248
249 if (suffix)
250 return parse_crashkernel_suffix(ck_cmdline, crash_size,
251 suffix);
252
253
254
255
256 first_colon = strchr(ck_cmdline, ':');
257 first_space = strchr(ck_cmdline, ' ');
258 if (first_colon && (!first_space || first_colon < first_space))
259 return parse_crashkernel_mem(ck_cmdline, system_ram,
260 crash_size, crash_base);
261
262 return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
263}
264
265
266
267
268
269int __init parse_crashkernel(char *cmdline,
270 unsigned long long system_ram,
271 unsigned long long *crash_size,
272 unsigned long long *crash_base)
273{
274 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
275 "crashkernel=", NULL);
276}
277
278int __init parse_crashkernel_high(char *cmdline,
279 unsigned long long system_ram,
280 unsigned long long *crash_size,
281 unsigned long long *crash_base)
282{
283 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
284 "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
285}
286
287int __init parse_crashkernel_low(char *cmdline,
288 unsigned long long system_ram,
289 unsigned long long *crash_size,
290 unsigned long long *crash_base)
291{
292 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
293 "crashkernel=", suffix_tbl[SUFFIX_LOW]);
294}
295
296Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
297 void *data, size_t data_len)
298{
299 struct elf_note *note = (struct elf_note *)buf;
300
301 note->n_namesz = strlen(name) + 1;
302 note->n_descsz = data_len;
303 note->n_type = type;
304 buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
305 memcpy(buf, name, note->n_namesz);
306 buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
307 memcpy(buf, data, data_len);
308 buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
309
310 return buf;
311}
312
313void final_note(Elf_Word *buf)
314{
315 memset(buf, 0, sizeof(struct elf_note));
316}
317
318static void update_vmcoreinfo_note(void)
319{
320 u32 *buf = vmcoreinfo_note;
321
322 if (!vmcoreinfo_size)
323 return;
324 buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
325 vmcoreinfo_size);
326 final_note(buf);
327}
328
329void crash_update_vmcoreinfo_safecopy(void *ptr)
330{
331 if (ptr)
332 memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
333
334 vmcoreinfo_data_safecopy = ptr;
335}
336
337void crash_save_vmcoreinfo(void)
338{
339 if (!vmcoreinfo_note)
340 return;
341
342
343 if (vmcoreinfo_data_safecopy)
344 vmcoreinfo_data = vmcoreinfo_data_safecopy;
345
346 vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
347 update_vmcoreinfo_note();
348}
349
350void vmcoreinfo_append_str(const char *fmt, ...)
351{
352 va_list args;
353 char buf[0x50];
354 size_t r;
355
356 va_start(args, fmt);
357 r = vscnprintf(buf, sizeof(buf), fmt, args);
358 va_end(args);
359
360 r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
361
362 memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
363
364 vmcoreinfo_size += r;
365}
366
367
368
369
370
371void __weak arch_crash_save_vmcoreinfo(void)
372{}
373
374phys_addr_t __weak paddr_vmcoreinfo_note(void)
375{
376 return __pa(vmcoreinfo_note);
377}
378
379static int __init crash_save_vmcoreinfo_init(void)
380{
381 vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
382 if (!vmcoreinfo_data) {
383 pr_warn("Memory allocation for vmcoreinfo_data failed\n");
384 return -ENOMEM;
385 }
386
387 vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
388 GFP_KERNEL | __GFP_ZERO);
389 if (!vmcoreinfo_note) {
390 free_page((unsigned long)vmcoreinfo_data);
391 vmcoreinfo_data = NULL;
392 pr_warn("Memory allocation for vmcoreinfo_note failed\n");
393 return -ENOMEM;
394 }
395
396 VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
397 VMCOREINFO_PAGESIZE(PAGE_SIZE);
398
399 VMCOREINFO_SYMBOL(init_uts_ns);
400 VMCOREINFO_SYMBOL(node_online_map);
401#ifdef CONFIG_MMU
402 VMCOREINFO_SYMBOL(swapper_pg_dir);
403#endif
404 VMCOREINFO_SYMBOL(_stext);
405 VMCOREINFO_SYMBOL(vmap_area_list);
406
407#ifndef CONFIG_NEED_MULTIPLE_NODES
408 VMCOREINFO_SYMBOL(mem_map);
409 VMCOREINFO_SYMBOL(contig_page_data);
410#endif
411#ifdef CONFIG_SPARSEMEM
412 VMCOREINFO_SYMBOL(mem_section);
413 VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
414 VMCOREINFO_STRUCT_SIZE(mem_section);
415 VMCOREINFO_OFFSET(mem_section, section_mem_map);
416#endif
417 VMCOREINFO_STRUCT_SIZE(page);
418 VMCOREINFO_STRUCT_SIZE(pglist_data);
419 VMCOREINFO_STRUCT_SIZE(zone);
420 VMCOREINFO_STRUCT_SIZE(free_area);
421 VMCOREINFO_STRUCT_SIZE(list_head);
422 VMCOREINFO_SIZE(nodemask_t);
423 VMCOREINFO_OFFSET(page, flags);
424 VMCOREINFO_OFFSET(page, _refcount);
425 VMCOREINFO_OFFSET(page, mapping);
426 VMCOREINFO_OFFSET(page, lru);
427 VMCOREINFO_OFFSET(page, _mapcount);
428 VMCOREINFO_OFFSET(page, private);
429 VMCOREINFO_OFFSET(page, compound_dtor);
430 VMCOREINFO_OFFSET(page, compound_order);
431 VMCOREINFO_OFFSET(page, compound_head);
432 VMCOREINFO_OFFSET(pglist_data, node_zones);
433 VMCOREINFO_OFFSET(pglist_data, nr_zones);
434#ifdef CONFIG_FLAT_NODE_MEM_MAP
435 VMCOREINFO_OFFSET(pglist_data, node_mem_map);
436#endif
437 VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
438 VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
439 VMCOREINFO_OFFSET(pglist_data, node_id);
440 VMCOREINFO_OFFSET(zone, free_area);
441 VMCOREINFO_OFFSET(zone, vm_stat);
442 VMCOREINFO_OFFSET(zone, spanned_pages);
443 VMCOREINFO_OFFSET(free_area, free_list);
444 VMCOREINFO_OFFSET(list_head, next);
445 VMCOREINFO_OFFSET(list_head, prev);
446 VMCOREINFO_OFFSET(vmap_area, va_start);
447 VMCOREINFO_OFFSET(vmap_area, list);
448 VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
449 log_buf_vmcoreinfo_setup();
450 VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
451 VMCOREINFO_NUMBER(NR_FREE_PAGES);
452 VMCOREINFO_NUMBER(PG_lru);
453 VMCOREINFO_NUMBER(PG_private);
454 VMCOREINFO_NUMBER(PG_swapcache);
455 VMCOREINFO_NUMBER(PG_slab);
456#ifdef CONFIG_MEMORY_FAILURE
457 VMCOREINFO_NUMBER(PG_hwpoison);
458#endif
459 VMCOREINFO_NUMBER(PG_head_mask);
460 VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
461#ifdef CONFIG_HUGETLB_PAGE
462 VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
463#endif
464
465 arch_crash_save_vmcoreinfo();
466 update_vmcoreinfo_note();
467
468 return 0;
469}
470
471subsys_initcall(crash_save_vmcoreinfo_init);
472
