[linux.git] / kernel / crash_core.c

/*
 * crash.c - kernel crash support code.
 * Copyright (C) 2002-2004 Eric Biederman  <[email protected]>
 *
 * 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;
static size_t vmcoreinfo_size;
u32 *vmcoreinfo_note;

/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
static unsigned char *vmcoreinfo_data_safecopy;

/*
 * 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_update_vmcoreinfo_safecopy(void *ptr)
{
	if (ptr)
		memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);

	vmcoreinfo_data_safecopy = ptr;
}

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

	/* Use the safe copy to generate vmcoreinfo note if have */
	if (vmcoreinfo_data_safecopy)
		vmcoreinfo_data = vmcoreinfo_data_safecopy;

	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, (size_t)VMCOREINFO_BYTES - 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 <[email protected]>
	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;
1229384f	18	static size_t vmcoreinfo_size;
203e9e41	19	u32 *vmcoreinfo_note;
692f66f2	20
1229384f XP	21	/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
	22	static unsigned char *vmcoreinfo_data_safecopy;
	23
692f66f2 HB	24	/*
	25	* parsing the "crashkernel" commandline
	26	*
	27	* this code is intended to be called from architecture specific code
	28	*/
	29
	30
	31	/*
	32	* This function parses command lines in the format
	33	*
	34	* crashkernel=ramsize-range:size[,...][@offset]
	35	*
	36	* The function returns 0 on success and -EINVAL on failure.
	37	*/
	38	static 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	/* for each entry of the comma-separated list */
	46	do {
	47	unsigned long long start, end = ULLONG_MAX, size;
	48
	49	/* get the start of the range */
	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	/* if no ':' is here, than we read the end */
	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	/* match ? */
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	* That function parses "simple" (old) crashkernel command lines like
118	*
119	* crashkernel=size[@offset]
120	*
121	* It returns 0 on success and -EINVAL on failure.
122	*/
123	static 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
148	static __initdata char *suffix_tbl[] = {
149	[SUFFIX_HIGH] = ",high",
150	[SUFFIX_LOW] = ",low",
151	[SUFFIX_NULL] = NULL,
152	};
153
154	/*
155	* That function parses "suffix" crashkernel command lines like
156	*
157	* crashkernel=size,[high\|low]
158	*
159	* It returns 0 on success and -EINVAL on failure.
160	*/
161	static 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	/* check with suffix */
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
187	static __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	/* find crashkernel and use the last one if there are more */
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	/* skip the one with any known suffix */
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	}
218	next:
219	p = strstr(p+1, name);
220	}
221
222	if (!ck_cmdline)
223	return NULL;
224
225	return ck_cmdline;
226	}
227
228	static 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	* if the commandline contains a ':', then that's the extended
254	* syntax -- if not, it must be the classic syntax
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	* That function is the entry point for command line parsing and should be
267	* called from the arch-specific code.
268	*/
269	int __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
278	int __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
287	int __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
51dbd925 HB	296	Elf_Word append_elf_note(Elf_Word buf, char *name, unsigned int type,
51dbd925 HB	297	void *data, size_t data_len)
692f66f2	298	{
51dbd925 HB	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));
692f66f2 HB	309
	310	return buf;
	311	}
	312
51dbd925	313	void final_note(Elf_Word *buf)
692f66f2	314	{
51dbd925	315	memset(buf, 0, sizeof(struct elf_note));
692f66f2 HB	316	}
	317
	318	static 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
1229384f XP	329	void 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
692f66f2 HB	337	void crash_save_vmcoreinfo(void)
692f66f2 HB	338	{
203e9e41 XP	339	if (!vmcoreinfo_note)
	340	return;
	341
1229384f XP	342	/* Use the safe copy to generate vmcoreinfo note if have */
	343	if (vmcoreinfo_data_safecopy)
	344	vmcoreinfo_data = vmcoreinfo_data_safecopy;
	345
692f66f2 HB	346	vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
	347	update_vmcoreinfo_note();
	348	}
	349
	350	void 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
5203f499	360	r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
692f66f2 HB	361
	362	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
	363
	364	vmcoreinfo_size += r;
	365	}
	366
	367	/*
	368	* provide an empty default implementation here -- architecture
	369	* code may override this
	370	*/
	371	void __weak arch_crash_save_vmcoreinfo(void)
	372	{}
	373
	374	phys_addr_t __weak paddr_vmcoreinfo_note(void)
	375	{
203e9e41	376	return __pa(vmcoreinfo_note);
692f66f2 HB	377	}
	378
	379	static int __init crash_save_vmcoreinfo_init(void)
	380	{
203e9e41 XP	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
692f66f2 HB	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
471	subsys_initcall(crash_save_vmcoreinfo_init);