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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * crash.c - kernel crash support code.
4 * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
5 */
6
7#include <linux/buildid.h>
8#include <linux/crash_core.h>
9#include <linux/init.h>
10#include <linux/utsname.h>
11#include <linux/vmalloc.h>
12#include <linux/sizes.h>
13
14#include <asm/page.h>
15#include <asm/sections.h>
16
17#include <crypto/sha1.h>
18
19#include "kallsyms_internal.h"
20
21/* vmcoreinfo stuff */
22unsigned char *vmcoreinfo_data;
23size_t vmcoreinfo_size;
24u32 *vmcoreinfo_note;
25
26/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
27static unsigned char *vmcoreinfo_data_safecopy;
28
29/*
30 * parsing the "crashkernel" commandline
31 *
32 * this code is intended to be called from architecture specific code
33 */
34
35
36/*
37 * This function parses command lines in the format
38 *
39 * crashkernel=ramsize-range:size[,...][@offset]
40 *
41 * The function returns 0 on success and -EINVAL on failure.
42 */
43static int __init parse_crashkernel_mem(char *cmdline,
44 unsigned long long system_ram,
45 unsigned long long *crash_size,
46 unsigned long long *crash_base)
47{
48 char *cur = cmdline, *tmp;
49 unsigned long long total_mem = system_ram;
50
51 /*
52 * Firmware sometimes reserves some memory regions for its own use,
53 * so the system memory size is less than the actual physical memory
54 * size. Work around this by rounding up the total size to 128M,
55 * which is enough for most test cases.
56 */
57 total_mem = roundup(total_mem, SZ_128M);
58
59 /* for each entry of the comma-separated list */
60 do {
61 unsigned long long start, end = ULLONG_MAX, size;
62
63 /* get the start of the range */
64 start = memparse(cur, &tmp);
65 if (cur == tmp) {
66 pr_warn("crashkernel: Memory value expected\n");
67 return -EINVAL;
68 }
69 cur = tmp;
70 if (*cur != '-') {
71 pr_warn("crashkernel: '-' expected\n");
72 return -EINVAL;
73 }
74 cur++;
75
76 /* if no ':' is here, than we read the end */
77 if (*cur != ':') {
78 end = memparse(cur, &tmp);
79 if (cur == tmp) {
80 pr_warn("crashkernel: Memory value expected\n");
81 return -EINVAL;
82 }
83 cur = tmp;
84 if (end <= start) {
85 pr_warn("crashkernel: end <= start\n");
86 return -EINVAL;
87 }
88 }
89
90 if (*cur != ':') {
91 pr_warn("crashkernel: ':' expected\n");
92 return -EINVAL;
93 }
94 cur++;
95
96 size = memparse(cur, &tmp);
97 if (cur == tmp) {
98 pr_warn("Memory value expected\n");
99 return -EINVAL;
100 }
101 cur = tmp;
102 if (size >= total_mem) {
103 pr_warn("crashkernel: invalid size\n");
104 return -EINVAL;
105 }
106
107 /* match ? */
108 if (total_mem >= start && total_mem < end) {
109 *crash_size = size;
110 break;
111 }
112 } while (*cur++ == ',');
113
114 if (*crash_size > 0) {
115 while (*cur && *cur != ' ' && *cur != '@')
116 cur++;
117 if (*cur == '@') {
118 cur++;
119 *crash_base = memparse(cur, &tmp);
120 if (cur == tmp) {
121 pr_warn("Memory value expected after '@'\n");
122 return -EINVAL;
123 }
124 }
125 } else
126 pr_info("crashkernel size resulted in zero bytes\n");
127
128 return 0;
129}
130
131/*
132 * That function parses "simple" (old) crashkernel command lines like
133 *
134 * crashkernel=size[@offset]
135 *
136 * It returns 0 on success and -EINVAL on failure.
137 */
138static int __init parse_crashkernel_simple(char *cmdline,
139 unsigned long long *crash_size,
140 unsigned long long *crash_base)
141{
142 char *cur = cmdline;
143
144 *crash_size = memparse(cmdline, &cur);
145 if (cmdline == cur) {
146 pr_warn("crashkernel: memory value expected\n");
147 return -EINVAL;
148 }
149
150 if (*cur == '@')
151 *crash_base = memparse(cur+1, &cur);
152 else if (*cur != ' ' && *cur != '\0') {
153 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
154 return -EINVAL;
155 }
156
157 return 0;
158}
159
160#define SUFFIX_HIGH 0
161#define SUFFIX_LOW 1
162#define SUFFIX_NULL 2
163static __initdata char *suffix_tbl[] = {
164 [SUFFIX_HIGH] = ",high",
165 [SUFFIX_LOW] = ",low",
166 [SUFFIX_NULL] = NULL,
167};
168
169/*
170 * That function parses "suffix" crashkernel command lines like
171 *
172 * crashkernel=size,[high|low]
173 *
174 * It returns 0 on success and -EINVAL on failure.
175 */
176static int __init parse_crashkernel_suffix(char *cmdline,
177 unsigned long long *crash_size,
178 const char *suffix)
179{
180 char *cur = cmdline;
181
182 *crash_size = memparse(cmdline, &cur);
183 if (cmdline == cur) {
184 pr_warn("crashkernel: memory value expected\n");
185 return -EINVAL;
186 }
187
188 /* check with suffix */
189 if (strncmp(cur, suffix, strlen(suffix))) {
190 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
191 return -EINVAL;
192 }
193 cur += strlen(suffix);
194 if (*cur != ' ' && *cur != '\0') {
195 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
196 return -EINVAL;
197 }
198
199 return 0;
200}
201
202static __init char *get_last_crashkernel(char *cmdline,
203 const char *name,
204 const char *suffix)
205{
206 char *p = cmdline, *ck_cmdline = NULL;
207
208 /* find crashkernel and use the last one if there are more */
209 p = strstr(p, name);
210 while (p) {
211 char *end_p = strchr(p, ' ');
212 char *q;
213
214 if (!end_p)
215 end_p = p + strlen(p);
216
217 if (!suffix) {
218 int i;
219
220 /* skip the one with any known suffix */
221 for (i = 0; suffix_tbl[i]; i++) {
222 q = end_p - strlen(suffix_tbl[i]);
223 if (!strncmp(q, suffix_tbl[i],
224 strlen(suffix_tbl[i])))
225 goto next;
226 }
227 ck_cmdline = p;
228 } else {
229 q = end_p - strlen(suffix);
230 if (!strncmp(q, suffix, strlen(suffix)))
231 ck_cmdline = p;
232 }
233next:
234 p = strstr(p+1, name);
235 }
236
237 return ck_cmdline;
238}
239
240static int __init __parse_crashkernel(char *cmdline,
241 unsigned long long system_ram,
242 unsigned long long *crash_size,
243 unsigned long long *crash_base,
244 const char *name,
245 const char *suffix)
246{
247 char *first_colon, *first_space;
248 char *ck_cmdline;
249
250 BUG_ON(!crash_size || !crash_base);
251 *crash_size = 0;
252 *crash_base = 0;
253
254 ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
255 if (!ck_cmdline)
256 return -ENOENT;
257
258 ck_cmdline += strlen(name);
259
260 if (suffix)
261 return parse_crashkernel_suffix(ck_cmdline, crash_size,
262 suffix);
263 /*
264 * if the commandline contains a ':', then that's the extended
265 * syntax -- if not, it must be the classic syntax
266 */
267 first_colon = strchr(ck_cmdline, ':');
268 first_space = strchr(ck_cmdline, ' ');
269 if (first_colon && (!first_space || first_colon < first_space))
270 return parse_crashkernel_mem(ck_cmdline, system_ram,
271 crash_size, crash_base);
272
273 return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
274}
275
276/*
277 * That function is the entry point for command line parsing and should be
278 * called from the arch-specific code.
279 */
280int __init parse_crashkernel(char *cmdline,
281 unsigned long long system_ram,
282 unsigned long long *crash_size,
283 unsigned long long *crash_base)
284{
285 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
286 "crashkernel=", NULL);
287}
288
289int __init parse_crashkernel_high(char *cmdline,
290 unsigned long long system_ram,
291 unsigned long long *crash_size,
292 unsigned long long *crash_base)
293{
294 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
295 "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
296}
297
298int __init parse_crashkernel_low(char *cmdline,
299 unsigned long long system_ram,
300 unsigned long long *crash_size,
301 unsigned long long *crash_base)
302{
303 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
304 "crashkernel=", suffix_tbl[SUFFIX_LOW]);
305}
306
307/*
308 * Add a dummy early_param handler to mark crashkernel= as a known command line
309 * parameter and suppress incorrect warnings in init/main.c.
310 */
311static int __init parse_crashkernel_dummy(char *arg)
312{
313 return 0;
314}
315early_param("crashkernel", parse_crashkernel_dummy);
316
317Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
318 void *data, size_t data_len)
319{
320 struct elf_note *note = (struct elf_note *)buf;
321
322 note->n_namesz = strlen(name) + 1;
323 note->n_descsz = data_len;
324 note->n_type = type;
325 buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
326 memcpy(buf, name, note->n_namesz);
327 buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
328 memcpy(buf, data, data_len);
329 buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
330
331 return buf;
332}
333
334void final_note(Elf_Word *buf)
335{
336 memset(buf, 0, sizeof(struct elf_note));
337}
338
339static void update_vmcoreinfo_note(void)
340{
341 u32 *buf = vmcoreinfo_note;
342
343 if (!vmcoreinfo_size)
344 return;
345 buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
346 vmcoreinfo_size);
347 final_note(buf);
348}
349
350void crash_update_vmcoreinfo_safecopy(void *ptr)
351{
352 if (ptr)
353 memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
354
355 vmcoreinfo_data_safecopy = ptr;
356}
357
358void crash_save_vmcoreinfo(void)
359{
360 if (!vmcoreinfo_note)
361 return;
362
363 /* Use the safe copy to generate vmcoreinfo note if have */
364 if (vmcoreinfo_data_safecopy)
365 vmcoreinfo_data = vmcoreinfo_data_safecopy;
366
367 vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
368 update_vmcoreinfo_note();
369}
370
371void vmcoreinfo_append_str(const char *fmt, ...)
372{
373 va_list args;
374 char buf[0x50];
375 size_t r;
376
377 va_start(args, fmt);
378 r = vscnprintf(buf, sizeof(buf), fmt, args);
379 va_end(args);
380
381 r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
382
383 memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
384
385 vmcoreinfo_size += r;
386
387 WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES,
388 "vmcoreinfo data exceeds allocated size, truncating");
389}
390
391/*
392 * provide an empty default implementation here -- architecture
393 * code may override this
394 */
395void __weak arch_crash_save_vmcoreinfo(void)
396{}
397
398phys_addr_t __weak paddr_vmcoreinfo_note(void)
399{
400 return __pa(vmcoreinfo_note);
401}
402EXPORT_SYMBOL(paddr_vmcoreinfo_note);
403
404static int __init crash_save_vmcoreinfo_init(void)
405{
406 vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
407 if (!vmcoreinfo_data) {
408 pr_warn("Memory allocation for vmcoreinfo_data failed\n");
409 return -ENOMEM;
410 }
411
412 vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
413 GFP_KERNEL | __GFP_ZERO);
414 if (!vmcoreinfo_note) {
415 free_page((unsigned long)vmcoreinfo_data);
416 vmcoreinfo_data = NULL;
417 pr_warn("Memory allocation for vmcoreinfo_note failed\n");
418 return -ENOMEM;
419 }
420
421 VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
422 VMCOREINFO_BUILD_ID();
423 VMCOREINFO_PAGESIZE(PAGE_SIZE);
424
425 VMCOREINFO_SYMBOL(init_uts_ns);
426 VMCOREINFO_OFFSET(uts_namespace, name);
427 VMCOREINFO_SYMBOL(node_online_map);
428#ifdef CONFIG_MMU
429 VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
430#endif
431 VMCOREINFO_SYMBOL(_stext);
432 VMCOREINFO_SYMBOL(vmap_area_list);
433
434#ifndef CONFIG_NUMA
435 VMCOREINFO_SYMBOL(mem_map);
436 VMCOREINFO_SYMBOL(contig_page_data);
437#endif
438#ifdef CONFIG_SPARSEMEM
439 VMCOREINFO_SYMBOL_ARRAY(mem_section);
440 VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
441 VMCOREINFO_STRUCT_SIZE(mem_section);
442 VMCOREINFO_OFFSET(mem_section, section_mem_map);
443 VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
444 VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
445#endif
446 VMCOREINFO_STRUCT_SIZE(page);
447 VMCOREINFO_STRUCT_SIZE(pglist_data);
448 VMCOREINFO_STRUCT_SIZE(zone);
449 VMCOREINFO_STRUCT_SIZE(free_area);
450 VMCOREINFO_STRUCT_SIZE(list_head);
451 VMCOREINFO_SIZE(nodemask_t);
452 VMCOREINFO_OFFSET(page, flags);
453 VMCOREINFO_OFFSET(page, _refcount);
454 VMCOREINFO_OFFSET(page, mapping);
455 VMCOREINFO_OFFSET(page, lru);
456 VMCOREINFO_OFFSET(page, _mapcount);
457 VMCOREINFO_OFFSET(page, private);
458 VMCOREINFO_OFFSET(page, compound_dtor);
459 VMCOREINFO_OFFSET(page, compound_order);
460 VMCOREINFO_OFFSET(page, compound_head);
461 VMCOREINFO_OFFSET(pglist_data, node_zones);
462 VMCOREINFO_OFFSET(pglist_data, nr_zones);
463#ifdef CONFIG_FLATMEM
464 VMCOREINFO_OFFSET(pglist_data, node_mem_map);
465#endif
466 VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
467 VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
468 VMCOREINFO_OFFSET(pglist_data, node_id);
469 VMCOREINFO_OFFSET(zone, free_area);
470 VMCOREINFO_OFFSET(zone, vm_stat);
471 VMCOREINFO_OFFSET(zone, spanned_pages);
472 VMCOREINFO_OFFSET(free_area, free_list);
473 VMCOREINFO_OFFSET(list_head, next);
474 VMCOREINFO_OFFSET(list_head, prev);
475 VMCOREINFO_OFFSET(vmap_area, va_start);
476 VMCOREINFO_OFFSET(vmap_area, list);
477 VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
478 log_buf_vmcoreinfo_setup();
479 VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
480 VMCOREINFO_NUMBER(NR_FREE_PAGES);
481 VMCOREINFO_NUMBER(PG_lru);
482 VMCOREINFO_NUMBER(PG_private);
483 VMCOREINFO_NUMBER(PG_swapcache);
484 VMCOREINFO_NUMBER(PG_swapbacked);
485 VMCOREINFO_NUMBER(PG_slab);
486#ifdef CONFIG_MEMORY_FAILURE
487 VMCOREINFO_NUMBER(PG_hwpoison);
488#endif
489 VMCOREINFO_NUMBER(PG_head_mask);
490#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
491 VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
492#ifdef CONFIG_HUGETLB_PAGE
493 VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
494#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
495 VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
496#endif
497
498#ifdef CONFIG_KALLSYMS
499 VMCOREINFO_SYMBOL(kallsyms_names);
500 VMCOREINFO_SYMBOL(kallsyms_num_syms);
501 VMCOREINFO_SYMBOL(kallsyms_token_table);
502 VMCOREINFO_SYMBOL(kallsyms_token_index);
503#ifdef CONFIG_KALLSYMS_BASE_RELATIVE
504 VMCOREINFO_SYMBOL(kallsyms_offsets);
505 VMCOREINFO_SYMBOL(kallsyms_relative_base);
506#else
507 VMCOREINFO_SYMBOL(kallsyms_addresses);
508#endif /* CONFIG_KALLSYMS_BASE_RELATIVE */
509#endif /* CONFIG_KALLSYMS */
510
511 arch_crash_save_vmcoreinfo();
512 update_vmcoreinfo_note();
513
514 return 0;
515}
516
517subsys_initcall(crash_save_vmcoreinfo_init);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * crash.c - kernel crash support code.
4 * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
5 */
6
7#include <linux/crash_core.h>
8#include <linux/utsname.h>
9#include <linux/vmalloc.h>
10
11#include <asm/page.h>
12#include <asm/sections.h>
13
14/* vmcoreinfo stuff */
15unsigned char *vmcoreinfo_data;
16size_t vmcoreinfo_size;
17u32 *vmcoreinfo_note;
18
19/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
20static unsigned char *vmcoreinfo_data_safecopy;
21
22/*
23 * parsing the "crashkernel" commandline
24 *
25 * this code is intended to be called from architecture specific code
26 */
27
28
29/*
30 * This function parses command lines in the format
31 *
32 * crashkernel=ramsize-range:size[,...][@offset]
33 *
34 * The function returns 0 on success and -EINVAL on failure.
35 */
36static int __init parse_crashkernel_mem(char *cmdline,
37 unsigned long long system_ram,
38 unsigned long long *crash_size,
39 unsigned long long *crash_base)
40{
41 char *cur = cmdline, *tmp;
42
43 /* for each entry of the comma-separated list */
44 do {
45 unsigned long long start, end = ULLONG_MAX, size;
46
47 /* get the start of the range */
48 start = memparse(cur, &tmp);
49 if (cur == tmp) {
50 pr_warn("crashkernel: Memory value expected\n");
51 return -EINVAL;
52 }
53 cur = tmp;
54 if (*cur != '-') {
55 pr_warn("crashkernel: '-' expected\n");
56 return -EINVAL;
57 }
58 cur++;
59
60 /* if no ':' is here, than we read the end */
61 if (*cur != ':') {
62 end = memparse(cur, &tmp);
63 if (cur == tmp) {
64 pr_warn("crashkernel: Memory value expected\n");
65 return -EINVAL;
66 }
67 cur = tmp;
68 if (end <= start) {
69 pr_warn("crashkernel: end <= start\n");
70 return -EINVAL;
71 }
72 }
73
74 if (*cur != ':') {
75 pr_warn("crashkernel: ':' expected\n");
76 return -EINVAL;
77 }
78 cur++;
79
80 size = memparse(cur, &tmp);
81 if (cur == tmp) {
82 pr_warn("Memory value expected\n");
83 return -EINVAL;
84 }
85 cur = tmp;
86 if (size >= system_ram) {
87 pr_warn("crashkernel: invalid size\n");
88 return -EINVAL;
89 }
90
91 /* match ? */
92 if (system_ram >= start && system_ram < end) {
93 *crash_size = size;
94 break;
95 }
96 } while (*cur++ == ',');
97
98 if (*crash_size > 0) {
99 while (*cur && *cur != ' ' && *cur != '@')
100 cur++;
101 if (*cur == '@') {
102 cur++;
103 *crash_base = memparse(cur, &tmp);
104 if (cur == tmp) {
105 pr_warn("Memory value expected after '@'\n");
106 return -EINVAL;
107 }
108 }
109 } else
110 pr_info("crashkernel size resulted in zero bytes\n");
111
112 return 0;
113}
114
115/*
116 * That function parses "simple" (old) crashkernel command lines like
117 *
118 * crashkernel=size[@offset]
119 *
120 * It returns 0 on success and -EINVAL on failure.
121 */
122static int __init parse_crashkernel_simple(char *cmdline,
123 unsigned long long *crash_size,
124 unsigned long long *crash_base)
125{
126 char *cur = cmdline;
127
128 *crash_size = memparse(cmdline, &cur);
129 if (cmdline == cur) {
130 pr_warn("crashkernel: memory value expected\n");
131 return -EINVAL;
132 }
133
134 if (*cur == '@')
135 *crash_base = memparse(cur+1, &cur);
136 else if (*cur != ' ' && *cur != '\0') {
137 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
138 return -EINVAL;
139 }
140
141 return 0;
142}
143
144#define SUFFIX_HIGH 0
145#define SUFFIX_LOW 1
146#define SUFFIX_NULL 2
147static __initdata char *suffix_tbl[] = {
148 [SUFFIX_HIGH] = ",high",
149 [SUFFIX_LOW] = ",low",
150 [SUFFIX_NULL] = NULL,
151};
152
153/*
154 * That function parses "suffix" crashkernel command lines like
155 *
156 * crashkernel=size,[high|low]
157 *
158 * It returns 0 on success and -EINVAL on failure.
159 */
160static int __init parse_crashkernel_suffix(char *cmdline,
161 unsigned long long *crash_size,
162 const char *suffix)
163{
164 char *cur = cmdline;
165
166 *crash_size = memparse(cmdline, &cur);
167 if (cmdline == cur) {
168 pr_warn("crashkernel: memory value expected\n");
169 return -EINVAL;
170 }
171
172 /* check with suffix */
173 if (strncmp(cur, suffix, strlen(suffix))) {
174 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
175 return -EINVAL;
176 }
177 cur += strlen(suffix);
178 if (*cur != ' ' && *cur != '\0') {
179 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
180 return -EINVAL;
181 }
182
183 return 0;
184}
185
186static __init char *get_last_crashkernel(char *cmdline,
187 const char *name,
188 const char *suffix)
189{
190 char *p = cmdline, *ck_cmdline = NULL;
191
192 /* find crashkernel and use the last one if there are more */
193 p = strstr(p, name);
194 while (p) {
195 char *end_p = strchr(p, ' ');
196 char *q;
197
198 if (!end_p)
199 end_p = p + strlen(p);
200
201 if (!suffix) {
202 int i;
203
204 /* skip the one with any known suffix */
205 for (i = 0; suffix_tbl[i]; i++) {
206 q = end_p - strlen(suffix_tbl[i]);
207 if (!strncmp(q, suffix_tbl[i],
208 strlen(suffix_tbl[i])))
209 goto next;
210 }
211 ck_cmdline = p;
212 } else {
213 q = end_p - strlen(suffix);
214 if (!strncmp(q, suffix, strlen(suffix)))
215 ck_cmdline = p;
216 }
217next:
218 p = strstr(p+1, name);
219 }
220
221 if (!ck_cmdline)
222 return NULL;
223
224 return ck_cmdline;
225}
226
227static int __init __parse_crashkernel(char *cmdline,
228 unsigned long long system_ram,
229 unsigned long long *crash_size,
230 unsigned long long *crash_base,
231 const char *name,
232 const char *suffix)
233{
234 char *first_colon, *first_space;
235 char *ck_cmdline;
236
237 BUG_ON(!crash_size || !crash_base);
238 *crash_size = 0;
239 *crash_base = 0;
240
241 ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
242
243 if (!ck_cmdline)
244 return -EINVAL;
245
246 ck_cmdline += strlen(name);
247
248 if (suffix)
249 return parse_crashkernel_suffix(ck_cmdline, crash_size,
250 suffix);
251 /*
252 * if the commandline contains a ':', then that's the extended
253 * syntax -- if not, it must be the classic syntax
254 */
255 first_colon = strchr(ck_cmdline, ':');
256 first_space = strchr(ck_cmdline, ' ');
257 if (first_colon && (!first_space || first_colon < first_space))
258 return parse_crashkernel_mem(ck_cmdline, system_ram,
259 crash_size, crash_base);
260
261 return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
262}
263
264/*
265 * That function is the entry point for command line parsing and should be
266 * called from the arch-specific code.
267 */
268int __init parse_crashkernel(char *cmdline,
269 unsigned long long system_ram,
270 unsigned long long *crash_size,
271 unsigned long long *crash_base)
272{
273 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
274 "crashkernel=", NULL);
275}
276
277int __init parse_crashkernel_high(char *cmdline,
278 unsigned long long system_ram,
279 unsigned long long *crash_size,
280 unsigned long long *crash_base)
281{
282 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
283 "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
284}
285
286int __init parse_crashkernel_low(char *cmdline,
287 unsigned long long system_ram,
288 unsigned long long *crash_size,
289 unsigned long long *crash_base)
290{
291 return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
292 "crashkernel=", suffix_tbl[SUFFIX_LOW]);
293}
294
295Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
296 void *data, size_t data_len)
297{
298 struct elf_note *note = (struct elf_note *)buf;
299
300 note->n_namesz = strlen(name) + 1;
301 note->n_descsz = data_len;
302 note->n_type = type;
303 buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
304 memcpy(buf, name, note->n_namesz);
305 buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
306 memcpy(buf, data, data_len);
307 buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
308
309 return buf;
310}
311
312void final_note(Elf_Word *buf)
313{
314 memset(buf, 0, sizeof(struct elf_note));
315}
316
317static void update_vmcoreinfo_note(void)
318{
319 u32 *buf = vmcoreinfo_note;
320
321 if (!vmcoreinfo_size)
322 return;
323 buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
324 vmcoreinfo_size);
325 final_note(buf);
326}
327
328void crash_update_vmcoreinfo_safecopy(void *ptr)
329{
330 if (ptr)
331 memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
332
333 vmcoreinfo_data_safecopy = ptr;
334}
335
336void crash_save_vmcoreinfo(void)
337{
338 if (!vmcoreinfo_note)
339 return;
340
341 /* Use the safe copy to generate vmcoreinfo note if have */
342 if (vmcoreinfo_data_safecopy)
343 vmcoreinfo_data = vmcoreinfo_data_safecopy;
344
345 vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
346 update_vmcoreinfo_note();
347}
348
349void vmcoreinfo_append_str(const char *fmt, ...)
350{
351 va_list args;
352 char buf[0x50];
353 size_t r;
354
355 va_start(args, fmt);
356 r = vscnprintf(buf, sizeof(buf), fmt, args);
357 va_end(args);
358
359 r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
360
361 memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
362
363 vmcoreinfo_size += r;
364}
365
366/*
367 * provide an empty default implementation here -- architecture
368 * code may override this
369 */
370void __weak arch_crash_save_vmcoreinfo(void)
371{}
372
373phys_addr_t __weak paddr_vmcoreinfo_note(void)
374{
375 return __pa(vmcoreinfo_note);
376}
377EXPORT_SYMBOL(paddr_vmcoreinfo_note);
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_ARRAY(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_ARRAY(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_swapbacked);
456 VMCOREINFO_NUMBER(PG_slab);
457#ifdef CONFIG_MEMORY_FAILURE
458 VMCOREINFO_NUMBER(PG_hwpoison);
459#endif
460 VMCOREINFO_NUMBER(PG_head_mask);
461#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
462 VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
463#ifdef CONFIG_HUGETLB_PAGE
464 VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
465#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
466 VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
467#endif
468
469 arch_crash_save_vmcoreinfo();
470 update_vmcoreinfo_note();
471
472 return 0;
473}
474
475subsys_initcall(crash_save_vmcoreinfo_init);