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Message-Id: <8afdff66-d92b-821b-2119-6de402e67a2a@linux.vnet.ibm.com>
Date: Thu, 23 Mar 2017 21:24:20 +0530
From: Hari Bathini <hbathini@...ux.vnet.ibm.com>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: linux-kernel@...r.kernel.org, fenghua.yu@...el.com,
tony.luck@...el.com, linux-ia64@...r.kernel.org,
Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>,
kexec@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
ebiederm@...ssion.com, dyoung@...hat.com, vgoyal@...hat.com
Subject: Re: [PATCH v4 1/5] crash: move crashkernel parsing and vmcore related
code under CONFIG_CRASH_CORE
Hi Michael,
It's been a while since this patchset is Ack'ed.
Should this go through powerpc-tree or some other?
Thanks
Hari
On Thursday 05 January 2017 10:59 PM, Hari Bathini wrote:
> Traditionally, kdump is used to save vmcore in case of a crash. Some
> architectures like powerpc can save vmcore using architecture specific
> support instead of kexec/kdump mechanism. Such architecture specific
> support also needs to reserve memory, to be used by dump capture kernel.
> crashkernel parameter can be a reused, for memory reservation, by such
> architecture specific infrastructure.
>
> But currently, code related to vmcoreinfo and parsing of crashkernel
> parameter is built under CONFIG_KEXEC_CORE. This patch introduces
> CONFIG_CRASH_CORE and moves the above mentioned code under this config,
> allowing code reuse without dependency on CONFIG_KEXEC. There is no
> functional change with this patch.
>
> Signed-off-by: Hari Bathini <hbathini@...ux.vnet.ibm.com>
> ---
>
> Changes from v3:
> * Renamed log_buf_kexec_setup()to log_buf_vmcoreinfo_setup() instead of
> log_buf_crash_setup().
>
> Changes from v2:
> * Used CONFIG_CRASH_CORE instead of CONFIG_KEXEC_CORE at
> appropriate places in printk and ksysfs.
>
>
> arch/Kconfig | 4
> include/linux/crash_core.h | 65 ++++++
> include/linux/kexec.h | 57 ------
> include/linux/printk.h | 4
> kernel/Makefile | 1
> kernel/crash_core.c | 445 ++++++++++++++++++++++++++++++++++++++++++++
> kernel/kexec_core.c | 404 ----------------------------------------
> kernel/ksysfs.c | 8 +
> kernel/printk/printk.c | 6 -
> 9 files changed, 531 insertions(+), 463 deletions(-)
> create mode 100644 include/linux/crash_core.h
> create mode 100644 kernel/crash_core.c
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 99839c2..82e6f99 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -2,7 +2,11 @@
> # General architecture dependent options
> #
>
> +config CRASH_CORE
> + bool
> +
> config KEXEC_CORE
> + select CRASH_CORE
> bool
>
> config HAVE_IMA_KEXEC
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> new file mode 100644
> index 0000000..18d0f94
> --- /dev/null
> +++ b/include/linux/crash_core.h
> @@ -0,0 +1,65 @@
> +#ifndef LINUX_CRASH_CORE_H
> +#define LINUX_CRASH_CORE_H
> +
> +#include <linux/linkage.h>
> +#include <linux/elfcore.h>
> +#include <linux/elf.h>
> +
> +#define CRASH_CORE_NOTE_NAME "CORE"
> +#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
> +#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
> +#define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
> +
> +#define CRASH_CORE_NOTE_BYTES ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \
> + CRASH_CORE_NOTE_NAME_BYTES + \
> + CRASH_CORE_NOTE_DESC_BYTES)
> +
> +#define VMCOREINFO_BYTES (4096)
> +#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
> +#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
> +#define VMCOREINFO_NOTE_SIZE ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \
> + VMCOREINFO_NOTE_NAME_BYTES + \
> + VMCOREINFO_BYTES)
> +
> +typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4];
> +
> +void crash_save_vmcoreinfo(void);
> +void arch_crash_save_vmcoreinfo(void);
> +__printf(1, 2)
> +void vmcoreinfo_append_str(const char *fmt, ...);
> +phys_addr_t paddr_vmcoreinfo_note(void);
> +
> +#define VMCOREINFO_OSRELEASE(value) \
> + vmcoreinfo_append_str("OSRELEASE=%s\n", value)
> +#define VMCOREINFO_PAGESIZE(value) \
> + vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
> +#define VMCOREINFO_SYMBOL(name) \
> + vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
> +#define VMCOREINFO_SIZE(name) \
> + vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
> + (unsigned long)sizeof(name))
> +#define VMCOREINFO_STRUCT_SIZE(name) \
> + vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
> + (unsigned long)sizeof(struct name))
> +#define VMCOREINFO_OFFSET(name, field) \
> + vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
> + (unsigned long)offsetof(struct name, field))
> +#define VMCOREINFO_LENGTH(name, value) \
> + vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
> +#define VMCOREINFO_NUMBER(name) \
> + vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
> +#define VMCOREINFO_CONFIG(name) \
> + vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
> +
> +extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> +extern size_t vmcoreinfo_size;
> +extern size_t vmcoreinfo_max_size;
> +
> +int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
> + unsigned long long *crash_size, unsigned long long *crash_base);
> +int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
> + unsigned long long *crash_size, unsigned long long *crash_base);
> +int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
> + unsigned long long *crash_size, unsigned long long *crash_base);
> +
> +#endif /* LINUX_CRASH_CORE_H */
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index d419d0e..c9481eb 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -14,17 +14,15 @@
>
> #if !defined(__ASSEMBLY__)
>
> +#include <linux/crash_core.h>
> #include <asm/io.h>
>
> #include <uapi/linux/kexec.h>
>
> #ifdef CONFIG_KEXEC_CORE
> #include <linux/list.h>
> -#include <linux/linkage.h>
> #include <linux/compat.h>
> #include <linux/ioport.h>
> -#include <linux/elfcore.h>
> -#include <linux/elf.h>
> #include <linux/module.h>
> #include <asm/kexec.h>
>
> @@ -62,19 +60,15 @@
> #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
> #endif
>
> -#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
> -#define KEXEC_CORE_NOTE_NAME "CORE"
> -#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
> -#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
> +#define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
> +
> /*
> * The per-cpu notes area is a list of notes terminated by a "NULL"
> * note header. For kdump, the code in vmcore.c runs in the context
> * of the second kernel to combine them into one note.
> */
> #ifndef KEXEC_NOTE_BYTES
> -#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
> - KEXEC_CORE_NOTE_NAME_BYTES + \
> - KEXEC_CORE_NOTE_DESC_BYTES )
> +#define KEXEC_NOTE_BYTES CRASH_CORE_NOTE_BYTES
> #endif
>
> /*
> @@ -256,33 +250,6 @@ extern void crash_kexec(struct pt_regs *);
> int kexec_should_crash(struct task_struct *);
> int kexec_crash_loaded(void);
> void crash_save_cpu(struct pt_regs *regs, int cpu);
> -void crash_save_vmcoreinfo(void);
> -void arch_crash_save_vmcoreinfo(void);
> -__printf(1, 2)
> -void vmcoreinfo_append_str(const char *fmt, ...);
> -phys_addr_t paddr_vmcoreinfo_note(void);
> -
> -#define VMCOREINFO_OSRELEASE(value) \
> - vmcoreinfo_append_str("OSRELEASE=%s\n", value)
> -#define VMCOREINFO_PAGESIZE(value) \
> - vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
> -#define VMCOREINFO_SYMBOL(name) \
> - vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
> -#define VMCOREINFO_SIZE(name) \
> - vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
> - (unsigned long)sizeof(name))
> -#define VMCOREINFO_STRUCT_SIZE(name) \
> - vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
> - (unsigned long)sizeof(struct name))
> -#define VMCOREINFO_OFFSET(name, field) \
> - vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
> - (unsigned long)offsetof(struct name, field))
> -#define VMCOREINFO_LENGTH(name, value) \
> - vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
> -#define VMCOREINFO_NUMBER(name) \
> - vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
> -#define VMCOREINFO_CONFIG(name) \
> - vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
>
> extern struct kimage *kexec_image;
> extern struct kimage *kexec_crash_image;
> @@ -303,31 +270,15 @@ extern int kexec_load_disabled;
> #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
> KEXEC_FILE_NO_INITRAMFS)
>
> -#define VMCOREINFO_BYTES (4096)
> -#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
> -#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
> -#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
> - + VMCOREINFO_NOTE_NAME_BYTES)
> -
> /* Location of a reserved region to hold the crash kernel.
> */
> extern struct resource crashk_res;
> extern struct resource crashk_low_res;
> -typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
> extern note_buf_t __percpu *crash_notes;
> -extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> -extern size_t vmcoreinfo_size;
> -extern size_t vmcoreinfo_max_size;
>
> /* flag to track if kexec reboot is in progress */
> extern bool kexec_in_progress;
>
> -int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
> - unsigned long long *crash_size, unsigned long long *crash_base);
> -int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
> - unsigned long long *crash_size, unsigned long long *crash_base);
> -int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
> - unsigned long long *crash_size, unsigned long long *crash_base);
> int crash_shrink_memory(unsigned long new_size);
> size_t crash_get_memory_size(void);
> void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index 3472cc6..6bb9b12 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -204,7 +204,7 @@ extern void wake_up_klogd(void);
>
> char *log_buf_addr_get(void);
> u32 log_buf_len_get(void);
> -void log_buf_kexec_setup(void);
> +void log_buf_vmcoreinfo_setup(void);
> void __init setup_log_buf(int early);
> __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
> void dump_stack_print_info(const char *log_lvl);
> @@ -249,7 +249,7 @@ static inline u32 log_buf_len_get(void)
> return 0;
> }
>
> -static inline void log_buf_kexec_setup(void)
> +static inline void log_buf_vmcoreinfo_setup(void)
> {
> }
>
> diff --git a/kernel/Makefile b/kernel/Makefile
> index 12c679f..ccdf704 100644
> --- a/kernel/Makefile
> +++ b/kernel/Makefile
> @@ -59,6 +59,7 @@ obj-$(CONFIG_MODULES) += module.o
> obj-$(CONFIG_MODULE_SIG) += module_signing.o
> obj-$(CONFIG_KALLSYMS) += kallsyms.o
> obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
> +obj-$(CONFIG_CRASH_CORE) += crash_core.o
> obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
> obj-$(CONFIG_KEXEC) += kexec.o
> obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> new file mode 100644
> index 0000000..80b441d
> --- /dev/null
> +++ b/kernel/crash_core.c
> @@ -0,0 +1,445 @@
> +/*
> + * crash.c - kernel crash support code.
> + * Copyright (C) 2002-2004 Eric Biederman <ebiederm@...ssion.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[VMCOREINFO_BYTES];
> +u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> +size_t vmcoreinfo_size;
> +size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
> +
> +/*
> + * 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]);
> +}
> +
> +static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> + void *data, size_t data_len)
> +{
> + struct elf_note note;
> +
> + note.n_namesz = strlen(name) + 1;
> + note.n_descsz = data_len;
> + note.n_type = type;
> + memcpy(buf, ¬e, sizeof(note));
> + buf += (sizeof(note) + 3)/4;
> + memcpy(buf, name, note.n_namesz);
> + buf += (note.n_namesz + 3)/4;
> + memcpy(buf, data, note.n_descsz);
> + buf += (note.n_descsz + 3)/4;
> +
> + return buf;
> +}
> +
> +static void final_note(u32 *buf)
> +{
> + struct elf_note note;
> +
> + note.n_namesz = 0;
> + note.n_descsz = 0;
> + note.n_type = 0;
> + memcpy(buf, ¬e, sizeof(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)
> +{
> + 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((unsigned long)(char *)&vmcoreinfo_note);
> +}
> +
> +static int __init crash_save_vmcoreinfo_init(void)
> +{
> + 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);
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index 5617cc4..2179a16 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -51,12 +51,6 @@ DEFINE_MUTEX(kexec_mutex);
> /* Per cpu memory for storing cpu states in case of system crash. */
> note_buf_t __percpu *crash_notes;
>
> -/* vmcoreinfo stuff */
> -static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
> -u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> -size_t vmcoreinfo_size;
> -size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
> -
> /* Flag to indicate we are going to kexec a new kernel */
> bool kexec_in_progress = false;
>
> @@ -1083,404 +1077,6 @@ static int __init crash_notes_memory_init(void)
> }
> subsys_initcall(crash_notes_memory_init);
>
> -
> -/*
> - * 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]);
> -}
> -
> -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)
> -{
> - 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((unsigned long)(char *)&vmcoreinfo_note);
> -}
> -
> -static int __init crash_save_vmcoreinfo_init(void)
> -{
> - 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_kexec_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);
> -
> /*
> * Move into place and start executing a preloaded standalone
> * executable. If nothing was preloaded return an error.
> diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
> index ee1bc1b..d8d69ee 100644
> --- a/kernel/ksysfs.c
> +++ b/kernel/ksysfs.c
> @@ -125,6 +125,10 @@ static ssize_t kexec_crash_size_store(struct kobject *kobj,
> }
> KERNEL_ATTR_RW(kexec_crash_size);
>
> +#endif /* CONFIG_KEXEC_CORE */
> +
> +#ifdef CONFIG_CRASH_CORE
> +
> static ssize_t vmcoreinfo_show(struct kobject *kobj,
> struct kobj_attribute *attr, char *buf)
> {
> @@ -134,7 +138,7 @@ static ssize_t vmcoreinfo_show(struct kobject *kobj,
> }
> KERNEL_ATTR_RO(vmcoreinfo);
>
> -#endif /* CONFIG_KEXEC_CORE */
> +#endif /* CONFIG_CRASH_CORE */
>
> /* whether file capabilities are enabled */
> static ssize_t fscaps_show(struct kobject *kobj,
> @@ -219,6 +223,8 @@ static struct attribute * kernel_attrs[] = {
> &kexec_loaded_attr.attr,
> &kexec_crash_loaded_attr.attr,
> &kexec_crash_size_attr.attr,
> +#endif
> +#ifdef CONFIG_CRASH_CORE
> &vmcoreinfo_attr.attr,
> #endif
> #ifndef CONFIG_TINY_RCU
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index 8b26964..527cb68 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -32,7 +32,7 @@
> #include <linux/bootmem.h>
> #include <linux/memblock.h>
> #include <linux/syscalls.h>
> -#include <linux/kexec.h>
> +#include <linux/crash_core.h>
> #include <linux/kdb.h>
> #include <linux/ratelimit.h>
> #include <linux/kmsg_dump.h>
> @@ -951,7 +951,7 @@ const struct file_operations kmsg_fops = {
> .release = devkmsg_release,
> };
>
> -#ifdef CONFIG_KEXEC_CORE
> +#ifdef CONFIG_CRASH_CORE
> /*
> * This appends the listed symbols to /proc/vmcore
> *
> @@ -960,7 +960,7 @@ const struct file_operations kmsg_fops = {
> * symbols are specifically used so that utilities can access and extract the
> * dmesg log from a vmcore file after a crash.
> */
> -void log_buf_kexec_setup(void)
> +void log_buf_vmcoreinfo_setup(void)
> {
> VMCOREINFO_SYMBOL(log_buf);
> VMCOREINFO_SYMBOL(log_buf_len);
>
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