[linux-2.6-block.git] / kernel / crash_core.c

/*
 * crash.c - kernel crash support code.
 * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/crash_core.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>

#include <asm/page.h>
#include <asm/sections.h>

/* vmcoreinfo stuff */
static unsigned char *vmcoreinfo_data;
size_t vmcoreinfo_size;
size_t vmcoreinfo_max_size = VMCOREINFO_BYTES;
u32 *vmcoreinfo_note;

/*
 * parsing the "crashkernel" commandline
 *
 * this code is intended to be called from architecture specific code
 */


/*
 * This function parses command lines in the format
 *
 *   crashkernel=ramsize-range:size[,...][@offset]
 *
 * The function returns 0 on success and -EINVAL on failure.
 */
static int __init parse_crashkernel_mem(char *cmdline,
					unsigned long long system_ram,
					unsigned long long *crash_size,
					unsigned long long *crash_base)
{
	char *cur = cmdline, *tmp;

	/* for each entry of the comma-separated list */
	do {
		unsigned long long start, end = ULLONG_MAX, size;

		/* get the start of the range */
		start = memparse(cur, &tmp);
		if (cur == tmp) {
			pr_warn("crashkernel: Memory value expected\n");
			return -EINVAL;
		}
		cur = tmp;
		if (*cur != '-') {
			pr_warn("crashkernel: '-' expected\n");
			return -EINVAL;
		}
		cur++;

		/* if no ':' is here, than we read the end */
		if (*cur != ':') {
			end = memparse(cur, &tmp);
			if (cur == tmp) {
				pr_warn("crashkernel: Memory value expected\n");
				return -EINVAL;
			}
			cur = tmp;
			if (end <= start) {
				pr_warn("crashkernel: end <= start\n");
				return -EINVAL;
			}
		}

		if (*cur != ':') {
			pr_warn("crashkernel: ':' expected\n");
			return -EINVAL;
		}
		cur++;

		size = memparse(cur, &tmp);
		if (cur == tmp) {
			pr_warn("Memory value expected\n");
			return -EINVAL;
		}
		cur = tmp;
		if (size >= system_ram) {
			pr_warn("crashkernel: invalid size\n");
			return -EINVAL;
		}

		/* match ? */
		if (system_ram >= start && system_ram < end) {
			*crash_size = size;
			break;
		}
	} while (*cur++ == ',');

	if (*crash_size > 0) {
		while (*cur && *cur != ' ' && *cur != '@')
			cur++;
		if (*cur == '@') {
			cur++;
			*crash_base = memparse(cur, &tmp);
			if (cur == tmp) {
				pr_warn("Memory value expected after '@'\n");
				return -EINVAL;
			}
		}
	}

	return 0;
}

/*
 * That function parses "simple" (old) crashkernel command lines like
 *
 *	crashkernel=size[@offset]
 *
 * It returns 0 on success and -EINVAL on failure.
 */
static int __init parse_crashkernel_simple(char *cmdline,
					   unsigned long long *crash_size,
					   unsigned long long *crash_base)
{
	char *cur = cmdline;

	*crash_size = memparse(cmdline, &cur);
	if (cmdline == cur) {
		pr_warn("crashkernel: memory value expected\n");
		return -EINVAL;
	}

	if (*cur == '@')
		*crash_base = memparse(cur+1, &cur);
	else if (*cur != ' ' && *cur != '\0') {
		pr_warn("crashkernel: unrecognized char: %c\n", *cur);
		return -EINVAL;
	}

	return 0;
}

#define SUFFIX_HIGH 0
#define SUFFIX_LOW  1
#define SUFFIX_NULL 2
static __initdata char *suffix_tbl[] = {
	[SUFFIX_HIGH] = ",high",
	[SUFFIX_LOW]  = ",low",
	[SUFFIX_NULL] = NULL,
};

/*
 * That function parses "suffix"  crashkernel command lines like
 *
 *	crashkernel=size,[high|low]
 *
 * It returns 0 on success and -EINVAL on failure.
 */
static int __init parse_crashkernel_suffix(char *cmdline,
					   unsigned long long	*crash_size,
					   const char *suffix)
{
	char *cur = cmdline;

	*crash_size = memparse(cmdline, &cur);
	if (cmdline == cur) {
		pr_warn("crashkernel: memory value expected\n");
		return -EINVAL;
	}

	/* check with suffix */
	if (strncmp(cur, suffix, strlen(suffix))) {
		pr_warn("crashkernel: unrecognized char: %c\n", *cur);
		return -EINVAL;
	}
	cur += strlen(suffix);
	if (*cur != ' ' && *cur != '\0') {
		pr_warn("crashkernel: unrecognized char: %c\n", *cur);
		return -EINVAL;
	}

	return 0;
}

static __init char *get_last_crashkernel(char *cmdline,
			     const char *name,
			     const char *suffix)
{
	char *p = cmdline, *ck_cmdline = NULL;

	/* find crashkernel and use the last one if there are more */
	p = strstr(p, name);
	while (p) {
		char *end_p = strchr(p, ' ');
		char *q;

		if (!end_p)
			end_p = p + strlen(p);

		if (!suffix) {
			int i;

			/* skip the one with any known suffix */
			for (i = 0; suffix_tbl[i]; i++) {
				q = end_p - strlen(suffix_tbl[i]);
				if (!strncmp(q, suffix_tbl[i],
					     strlen(suffix_tbl[i])))
					goto next;
			}
			ck_cmdline = p;
		} else {
			q = end_p - strlen(suffix);
			if (!strncmp(q, suffix, strlen(suffix)))
				ck_cmdline = p;
		}
next:
		p = strstr(p+1, name);
	}

	if (!ck_cmdline)
		return NULL;

	return ck_cmdline;
}

static int __init __parse_crashkernel(char *cmdline,
			     unsigned long long system_ram,
			     unsigned long long *crash_size,
			     unsigned long long *crash_base,
			     const char *name,
			     const char *suffix)
{
	char	*first_colon, *first_space;
	char	*ck_cmdline;

	BUG_ON(!crash_size || !crash_base);
	*crash_size = 0;
	*crash_base = 0;

	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);

	if (!ck_cmdline)
		return -EINVAL;

	ck_cmdline += strlen(name);

	if (suffix)
		return parse_crashkernel_suffix(ck_cmdline, crash_size,
				suffix);
	/*
	 * if the commandline contains a ':', then that's the extended
	 * syntax -- if not, it must be the classic syntax
	 */
	first_colon = strchr(ck_cmdline, ':');
	first_space = strchr(ck_cmdline, ' ');
	if (first_colon && (!first_space || first_colon < first_space))
		return parse_crashkernel_mem(ck_cmdline, system_ram,
				crash_size, crash_base);

	return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
}

/*
 * That function is the entry point for command line parsing and should be
 * called from the arch-specific code.
 */
int __init parse_crashkernel(char *cmdline,
			     unsigned long long system_ram,
			     unsigned long long *crash_size,
			     unsigned long long *crash_base)
{
	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
					"crashkernel=", NULL);
}

int __init parse_crashkernel_high(char *cmdline,
			     unsigned long long system_ram,
			     unsigned long long *crash_size,
			     unsigned long long *crash_base)
{
	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
				"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
}

int __init parse_crashkernel_low(char *cmdline,
			     unsigned long long system_ram,
			     unsigned long long *crash_size,
			     unsigned long long *crash_base)
{
	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
				"crashkernel=", suffix_tbl[SUFFIX_LOW]);
}

Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
			  void *data, size_t data_len)
{
	struct elf_note *note = (struct elf_note *)buf;

	note->n_namesz = strlen(name) + 1;
	note->n_descsz = data_len;
	note->n_type   = type;
	buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
	memcpy(buf, name, note->n_namesz);
	buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
	memcpy(buf, data, data_len);
	buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));

	return buf;
}

void final_note(Elf_Word *buf)
{
	memset(buf, 0, sizeof(struct elf_note));
}

static void update_vmcoreinfo_note(void)
{
	u32 *buf = vmcoreinfo_note;

	if (!vmcoreinfo_size)
		return;
	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
			      vmcoreinfo_size);
	final_note(buf);
}

void crash_save_vmcoreinfo(void)
{
	if (!vmcoreinfo_note)
		return;

	vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
	update_vmcoreinfo_note();
}

void vmcoreinfo_append_str(const char *fmt, ...)
{
	va_list args;
	char buf[0x50];
	size_t r;

	va_start(args, fmt);
	r = vscnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	r = min(r, vmcoreinfo_max_size - vmcoreinfo_size);

	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);

	vmcoreinfo_size += r;
}

/*
 * provide an empty default implementation here -- architecture
 * code may override this
 */
void __weak arch_crash_save_vmcoreinfo(void)
{}

phys_addr_t __weak paddr_vmcoreinfo_note(void)
{
	return __pa(vmcoreinfo_note);
}

static int __init crash_save_vmcoreinfo_init(void)
{
	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	if (!vmcoreinfo_data) {
		pr_warn("Memory allocation for vmcoreinfo_data failed\n");
		return -ENOMEM;
	}

	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
						GFP_KERNEL | __GFP_ZERO);
	if (!vmcoreinfo_note) {
		free_page((unsigned long)vmcoreinfo_data);
		vmcoreinfo_data = NULL;
		pr_warn("Memory allocation for vmcoreinfo_note failed\n");
		return -ENOMEM;
	}

	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
	VMCOREINFO_PAGESIZE(PAGE_SIZE);

	VMCOREINFO_SYMBOL(init_uts_ns);
	VMCOREINFO_SYMBOL(node_online_map);
#ifdef CONFIG_MMU
	VMCOREINFO_SYMBOL(swapper_pg_dir);
#endif
	VMCOREINFO_SYMBOL(_stext);
	VMCOREINFO_SYMBOL(vmap_area_list);

#ifndef CONFIG_NEED_MULTIPLE_NODES
	VMCOREINFO_SYMBOL(mem_map);
	VMCOREINFO_SYMBOL(contig_page_data);
#endif
#ifdef CONFIG_SPARSEMEM
	VMCOREINFO_SYMBOL(mem_section);
	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	VMCOREINFO_STRUCT_SIZE(mem_section);
	VMCOREINFO_OFFSET(mem_section, section_mem_map);
#endif
	VMCOREINFO_STRUCT_SIZE(page);
	VMCOREINFO_STRUCT_SIZE(pglist_data);
	VMCOREINFO_STRUCT_SIZE(zone);
	VMCOREINFO_STRUCT_SIZE(free_area);
	VMCOREINFO_STRUCT_SIZE(list_head);
	VMCOREINFO_SIZE(nodemask_t);
	VMCOREINFO_OFFSET(page, flags);
	VMCOREINFO_OFFSET(page, _refcount);
	VMCOREINFO_OFFSET(page, mapping);
	VMCOREINFO_OFFSET(page, lru);
	VMCOREINFO_OFFSET(page, _mapcount);
	VMCOREINFO_OFFSET(page, private);
	VMCOREINFO_OFFSET(page, compound_dtor);
	VMCOREINFO_OFFSET(page, compound_order);
	VMCOREINFO_OFFSET(page, compound_head);
	VMCOREINFO_OFFSET(pglist_data, node_zones);
	VMCOREINFO_OFFSET(pglist_data, nr_zones);
#ifdef CONFIG_FLAT_NODE_MEM_MAP
	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
#endif
	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	VMCOREINFO_OFFSET(pglist_data, node_id);
	VMCOREINFO_OFFSET(zone, free_area);
	VMCOREINFO_OFFSET(zone, vm_stat);
	VMCOREINFO_OFFSET(zone, spanned_pages);
	VMCOREINFO_OFFSET(free_area, free_list);
	VMCOREINFO_OFFSET(list_head, next);
	VMCOREINFO_OFFSET(list_head, prev);
	VMCOREINFO_OFFSET(vmap_area, va_start);
	VMCOREINFO_OFFSET(vmap_area, list);
	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	log_buf_vmcoreinfo_setup();
	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	VMCOREINFO_NUMBER(PG_lru);
	VMCOREINFO_NUMBER(PG_private);
	VMCOREINFO_NUMBER(PG_swapcache);
	VMCOREINFO_NUMBER(PG_slab);
#ifdef CONFIG_MEMORY_FAILURE
	VMCOREINFO_NUMBER(PG_hwpoison);
#endif
	VMCOREINFO_NUMBER(PG_head_mask);
	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
#ifdef CONFIG_HUGETLB_PAGE
	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
#endif

	arch_crash_save_vmcoreinfo();
	update_vmcoreinfo_note();

	return 0;
}

subsys_initcall(crash_save_vmcoreinfo_init);
Commit	Line	Data
692f66f2 HB	1	/*
	2	* crash.c - kernel crash support code.
	3	* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
	4	*
	5	* This source code is licensed under the GNU General Public License,
	6	* Version 2. See the file COPYING for more details.
	7	*/
	8
	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	/* vmcoreinfo stuff */
203e9e41	17	static unsigned char *vmcoreinfo_data;
692f66f2	18	size_t vmcoreinfo_size;
203e9e41 XP	19	size_t vmcoreinfo_max_size = VMCOREINFO_BYTES;
203e9e41 XP	20	u32 *vmcoreinfo_note;
692f66f2 HB	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	*/
	36	static 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	}
110
111	return 0;
112	}
113
114	/*
115	* That function parses "simple" (old) crashkernel command lines like
116	*
117	* crashkernel=size[@offset]
118	*
119	* It returns 0 on success and -EINVAL on failure.
120	*/
121	static int __init parse_crashkernel_simple(char *cmdline,
122	unsigned long long *crash_size,
123	unsigned long long *crash_base)
124	{
125	char *cur = cmdline;
126
127	*crash_size = memparse(cmdline, &cur);
128	if (cmdline == cur) {
129	pr_warn("crashkernel: memory value expected\n");
130	return -EINVAL;
131	}
132
133	if (*cur == '@')
134	*crash_base = memparse(cur+1, &cur);
135	else if (cur != ' ' && cur != '\0') {
136	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
137	return -EINVAL;
138	}
139
140	return 0;
141	}
142
143	#define SUFFIX_HIGH 0
144	#define SUFFIX_LOW 1
145	#define SUFFIX_NULL 2
146	static __initdata char *suffix_tbl[] = {
147	[SUFFIX_HIGH] = ",high",
148	[SUFFIX_LOW] = ",low",
149	[SUFFIX_NULL] = NULL,
150	};
151
152	/*
153	* That function parses "suffix" crashkernel command lines like
154	*
155	* crashkernel=size,[high\|low]
156	*
157	* It returns 0 on success and -EINVAL on failure.
158	*/
159	static int __init parse_crashkernel_suffix(char *cmdline,
160	unsigned long long *crash_size,
161	const char *suffix)
162	{
163	char *cur = cmdline;
164
165	*crash_size = memparse(cmdline, &cur);
166	if (cmdline == cur) {
167	pr_warn("crashkernel: memory value expected\n");
168	return -EINVAL;
169	}
170
171	/* check with suffix */
172	if (strncmp(cur, suffix, strlen(suffix))) {
173	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
174	return -EINVAL;
175	}
176	cur += strlen(suffix);
177	if (cur != ' ' && cur != '\0') {
178	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
179	return -EINVAL;
180	}
181
182	return 0;
183	}
184
185	static __init char get_last_crashkernel(char cmdline,
186	const char *name,
187	const char *suffix)
188	{
189	char p = cmdline, ck_cmdline = NULL;
190
191	/* find crashkernel and use the last one if there are more */
192	p = strstr(p, name);
193	while (p) {
194	char *end_p = strchr(p, ' ');
195	char *q;
196
197	if (!end_p)
198	end_p = p + strlen(p);
199
200	if (!suffix) {
201	int i;
202
203	/* skip the one with any known suffix */
204	for (i = 0; suffix_tbl[i]; i++) {
205	q = end_p - strlen(suffix_tbl[i]);
206	if (!strncmp(q, suffix_tbl[i],
207	strlen(suffix_tbl[i])))
208	goto next;
209	}
210	ck_cmdline = p;
211	} else {
212	q = end_p - strlen(suffix);
213	if (!strncmp(q, suffix, strlen(suffix)))
214	ck_cmdline = p;
215	}
216	next:
217	p = strstr(p+1, name);
218	}
219
220	if (!ck_cmdline)
221	return NULL;
222
223	return ck_cmdline;
224	}
225
226	static int __init __parse_crashkernel(char *cmdline,
227	unsigned long long system_ram,
228	unsigned long long *crash_size,
229	unsigned long long *crash_base,
230	const char *name,
231	const char *suffix)
232	{
233	char first_colon, first_space;
234	char *ck_cmdline;
235
236	BUG_ON(!crash_size \|\| !crash_base);
237	*crash_size = 0;
238	*crash_base = 0;
239
240	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
241
242	if (!ck_cmdline)
243	return -EINVAL;
244
245	ck_cmdline += strlen(name);
246
247	if (suffix)
248	return parse_crashkernel_suffix(ck_cmdline, crash_size,
249	suffix);
250	/*
251	* if the commandline contains a ':', then that's the extended
252	* syntax -- if not, it must be the classic syntax
253	*/
254	first_colon = strchr(ck_cmdline, ':');
255	first_space = strchr(ck_cmdline, ' ');
256	if (first_colon && (!first_space \|\| first_colon < first_space))
257	return parse_crashkernel_mem(ck_cmdline, system_ram,
258	crash_size, crash_base);
259
260	return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
261	}
262
263	/*
264	* That function is the entry point for command line parsing and should be
265	* called from the arch-specific code.
266	*/
267	int __init parse_crashkernel(char *cmdline,
268	unsigned long long system_ram,
269	unsigned long long *crash_size,
270	unsigned long long *crash_base)
271	{
272	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
273	"crashkernel=", NULL);
274	}
275
276	int __init parse_crashkernel_high(char *cmdline,
277	unsigned long long system_ram,
278	unsigned long long *crash_size,
279	unsigned long long *crash_base)
280	{
281	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
282	"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
283	}
284
285	int __init parse_crashkernel_low(char *cmdline,
286	unsigned long long system_ram,
287	unsigned long long *crash_size,
288	unsigned long long *crash_base)
289	{
290	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
291	"crashkernel=", suffix_tbl[SUFFIX_LOW]);
292	}
293
51dbd925 HB	294	Elf_Word append_elf_note(Elf_Word buf, char *name, unsigned int type,
51dbd925 HB	295	void *data, size_t data_len)
692f66f2	296	{
51dbd925 HB	297	struct elf_note note = (struct elf_note )buf;
	298
	299	note->n_namesz = strlen(name) + 1;
	300	note->n_descsz = data_len;
	301	note->n_type = type;
	302	buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
	303	memcpy(buf, name, note->n_namesz);
	304	buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
	305	memcpy(buf, data, data_len);
	306	buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
692f66f2 HB	307
	308	return buf;
	309	}
	310
51dbd925	311	void final_note(Elf_Word *buf)
692f66f2	312	{
51dbd925	313	memset(buf, 0, sizeof(struct elf_note));
692f66f2 HB	314	}
	315
	316	static void update_vmcoreinfo_note(void)
	317	{
	318	u32 *buf = vmcoreinfo_note;
	319
	320	if (!vmcoreinfo_size)
	321	return;
	322	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
	323	vmcoreinfo_size);
	324	final_note(buf);
	325	}
	326
	327	void crash_save_vmcoreinfo(void)
	328	{
203e9e41 XP	329	if (!vmcoreinfo_note)
	330	return;
	331
692f66f2 HB	332	vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
	333	update_vmcoreinfo_note();
	334	}
	335
	336	void vmcoreinfo_append_str(const char *fmt, ...)
	337	{
	338	va_list args;
	339	char buf[0x50];
	340	size_t r;
	341
	342	va_start(args, fmt);
	343	r = vscnprintf(buf, sizeof(buf), fmt, args);
	344	va_end(args);
	345
	346	r = min(r, vmcoreinfo_max_size - vmcoreinfo_size);
	347
	348	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
	349
	350	vmcoreinfo_size += r;
	351	}
	352
	353	/*
	354	* provide an empty default implementation here -- architecture
	355	* code may override this
	356	*/
	357	void __weak arch_crash_save_vmcoreinfo(void)
	358	{}
	359
	360	phys_addr_t __weak paddr_vmcoreinfo_note(void)
	361	{
203e9e41	362	return __pa(vmcoreinfo_note);
692f66f2 HB	363	}
	364
	365	static int __init crash_save_vmcoreinfo_init(void)
	366	{
203e9e41 XP	367	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	368	if (!vmcoreinfo_data) {
	369	pr_warn("Memory allocation for vmcoreinfo_data failed\n");
	370	return -ENOMEM;
	371	}
	372
	373	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
	374	GFP_KERNEL \| __GFP_ZERO);
	375	if (!vmcoreinfo_note) {
	376	free_page((unsigned long)vmcoreinfo_data);
	377	vmcoreinfo_data = NULL;
	378	pr_warn("Memory allocation for vmcoreinfo_note failed\n");
	379	return -ENOMEM;
	380	}
	381
692f66f2 HB	382	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
	383	VMCOREINFO_PAGESIZE(PAGE_SIZE);
	384
	385	VMCOREINFO_SYMBOL(init_uts_ns);
	386	VMCOREINFO_SYMBOL(node_online_map);
	387	#ifdef CONFIG_MMU
	388	VMCOREINFO_SYMBOL(swapper_pg_dir);
	389	#endif
	390	VMCOREINFO_SYMBOL(_stext);
	391	VMCOREINFO_SYMBOL(vmap_area_list);
	392
	393	#ifndef CONFIG_NEED_MULTIPLE_NODES
	394	VMCOREINFO_SYMBOL(mem_map);
	395	VMCOREINFO_SYMBOL(contig_page_data);
	396	#endif
	397	#ifdef CONFIG_SPARSEMEM
	398	VMCOREINFO_SYMBOL(mem_section);
	399	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	400	VMCOREINFO_STRUCT_SIZE(mem_section);
	401	VMCOREINFO_OFFSET(mem_section, section_mem_map);
	402	#endif
	403	VMCOREINFO_STRUCT_SIZE(page);
	404	VMCOREINFO_STRUCT_SIZE(pglist_data);
	405	VMCOREINFO_STRUCT_SIZE(zone);
	406	VMCOREINFO_STRUCT_SIZE(free_area);
	407	VMCOREINFO_STRUCT_SIZE(list_head);
	408	VMCOREINFO_SIZE(nodemask_t);
	409	VMCOREINFO_OFFSET(page, flags);
	410	VMCOREINFO_OFFSET(page, _refcount);
	411	VMCOREINFO_OFFSET(page, mapping);
	412	VMCOREINFO_OFFSET(page, lru);
	413	VMCOREINFO_OFFSET(page, _mapcount);
	414	VMCOREINFO_OFFSET(page, private);
	415	VMCOREINFO_OFFSET(page, compound_dtor);
	416	VMCOREINFO_OFFSET(page, compound_order);
	417	VMCOREINFO_OFFSET(page, compound_head);
	418	VMCOREINFO_OFFSET(pglist_data, node_zones);
	419	VMCOREINFO_OFFSET(pglist_data, nr_zones);
	420	#ifdef CONFIG_FLAT_NODE_MEM_MAP
	421	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
	422	#endif
	423	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	424	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	425	VMCOREINFO_OFFSET(pglist_data, node_id);
	426	VMCOREINFO_OFFSET(zone, free_area);
	427	VMCOREINFO_OFFSET(zone, vm_stat);
	428	VMCOREINFO_OFFSET(zone, spanned_pages);
	429	VMCOREINFO_OFFSET(free_area, free_list);
	430	VMCOREINFO_OFFSET(list_head, next);
	431	VMCOREINFO_OFFSET(list_head, prev);
	432	VMCOREINFO_OFFSET(vmap_area, va_start);
	433	VMCOREINFO_OFFSET(vmap_area, list);
	434	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	435	log_buf_vmcoreinfo_setup();
	436	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	437	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	438	VMCOREINFO_NUMBER(PG_lru);
	439	VMCOREINFO_NUMBER(PG_private);
	440	VMCOREINFO_NUMBER(PG_swapcache);
	441	VMCOREINFO_NUMBER(PG_slab);
	442	#ifdef CONFIG_MEMORY_FAILURE
	443	VMCOREINFO_NUMBER(PG_hwpoison);
	444	#endif
	445	VMCOREINFO_NUMBER(PG_head_mask);
446	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
447	#ifdef CONFIG_HUGETLB_PAGE
448	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
449	#endif
450
451	arch_crash_save_vmcoreinfo();
452	update_vmcoreinfo_note();
453
454	return 0;
455	}
456
457	subsys_initcall(crash_save_vmcoreinfo_init);