Commit fd59d231 authored by Ken'ichi Ohmichi's avatar Ken'ichi Ohmichi Committed by Linus Torvalds
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Add vmcoreinfo

This patch set frees the restriction that makedumpfile users should install a
vmlinux file (including the debugging information) into each system.

makedumpfile command is the dump filtering feature for kdump.  It creates a
small dumpfile by filtering unnecessary pages for the analysis.  To
distinguish unnecessary pages, it needs a vmlinux file including the debugging
information.  These days, the debugging package becomes a huge file, and it is
hard to install it into each system.

To solve the problem, kdump developers discussed it at lkml and kexec-ml.  As
the result, we reached the conclusion that necessary information for dump
filtering (called "vmcoreinfo") should be embedded into the first kernel file
and it should be accessed through /proc/vmcore during the second kernel.
(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.0/1806.html)

Dan Aloni created the patch set for the above implementation.
(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.1/1053.html)

And I updated it for multi architectures and memory models.
(http://lists.infradead.org/pipermail/kexec/2007-August/000479.html

)
Signed-off-by: default avatarDan Aloni <da-x@monatomic.org>
Signed-off-by: default avatarKen'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Signed-off-by: default avatarBernhard Walle <bwalle@suse.de>
Signed-off-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0e647c04
......@@ -15,6 +15,8 @@
#include <linux/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
#include <linux/numa.h>
#include <linux/mmzone.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
......@@ -121,3 +123,31 @@ void machine_kexec(struct kimage *image)
unw_init_running(ia64_machine_kexec, image);
for(;;);
}
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
SYMBOL(pgdat_list);
LENGTH(pgdat_list, MAX_NUMNODES);
SYMBOL(node_memblk);
LENGTH(node_memblk, NR_NODE_MEMBLKS);
SIZE(node_memblk_s);
OFFSET(node_memblk_s, start_paddr);
OFFSET(node_memblk_s, size);
#endif
#ifdef CONFIG_PGTABLE_3
CONFIG(PGTABLE_3);
#elif CONFIG_PGTABLE_4
CONFIG(PGTABLE_4);
#endif
}
unsigned long paddr_vmcoreinfo_note(void)
{
unsigned long vaddr, paddr;
vaddr = (unsigned long)(char *)&vmcoreinfo_note;
asm volatile ("tpa %0 = %1" : "=r"(paddr) : "r"(vaddr) : "memory");
return paddr;
}
......@@ -48,7 +48,7 @@ struct early_node_data {
static struct early_node_data mem_data[MAX_NUMNODES] __initdata;
static nodemask_t memory_less_mask __initdata;
static pg_data_t *pgdat_list[MAX_NUMNODES];
pg_data_t *pgdat_list[MAX_NUMNODES];
/*
* To prevent cache aliasing effects, align per-node structures so that they
......
......@@ -10,6 +10,7 @@
#include <linux/kexec.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
......@@ -169,3 +170,15 @@ static int __init parse_crashkernel(char *arg)
return 0;
}
early_param("crashkernel", parse_crashkernel);
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
SYMBOL(node_data);
LENGTH(node_data, MAX_NUMNODES);
#endif
#ifdef CONFIG_X86_PAE
CONFIG(X86_PAE);
#endif
}
......@@ -10,6 +10,7 @@
#include <linux/kexec.h>
#include <linux/string.h>
#include <linux/reboot.h>
#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
......@@ -257,3 +258,11 @@ static int __init setup_crashkernel(char *arg)
}
early_param("crashkernel", setup_crashkernel);
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
SYMBOL(node_data);
LENGTH(node_data, MAX_NUMNODES);
#endif
}
......@@ -24,6 +24,7 @@
extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
extern pg_data_t *pgdat_list[MAX_NUMNODES];
/* Stuff below this line could be architecture independent */
......
......@@ -121,6 +121,23 @@ extern struct page *kimage_alloc_control_pages(struct kimage *image,
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
void crash_save_vmcoreinfo(void);
void arch_crash_save_vmcoreinfo(void);
void vmcoreinfo_append_str(const char *fmt, ...);
unsigned long paddr_vmcoreinfo_note(void);
#define SYMBOL(name) \
vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
#define SIZE(name) \
vmcoreinfo_append_str("SIZE(%s)=%d\n", #name, sizeof(struct name))
#define OFFSET(name, field) \
vmcoreinfo_append_str("OFFSET(%s.%s)=%d\n", #name, #field, \
&(((struct name *)0)->field))
#define LENGTH(name, value) \
vmcoreinfo_append_str("LENGTH(%s)=%d\n", #name, value)
#define CONFIG(name) \
vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;
......@@ -148,11 +165,20 @@ extern struct kimage *kexec_crash_image;
#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
#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;
typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
extern note_buf_t *crash_notes;
extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
extern unsigned int vmcoreinfo_size;
extern unsigned int vmcoreinfo_max_size;
#else /* !CONFIG_KEXEC */
......
......@@ -21,16 +21,26 @@
#include <linux/hardirq.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/utsrelease.h>
#include <linux/utsname.h>
#include <linux/numa.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/semaphore.h>
#include <asm/sections.h>
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t* crash_notes;
/* vmcoreinfo stuff */
unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
unsigned int vmcoreinfo_size = 0;
unsigned int vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
/* Location of the reserved area for the crash kernel */
struct resource crashk_res = {
.name = "Crash kernel",
......@@ -1060,6 +1070,7 @@ void crash_kexec(struct pt_regs *regs)
if (kexec_crash_image) {
struct pt_regs fixed_regs;
crash_setup_regs(&fixed_regs, regs);
crash_save_vmcoreinfo();
machine_crash_shutdown(&fixed_regs);
machine_kexec(kexec_crash_image);
}
......@@ -1134,3 +1145,102 @@ static int __init crash_notes_memory_init(void)
return 0;
}
module_init(crash_notes_memory_init)
void crash_save_vmcoreinfo(void)
{
u32 *buf;
if (!vmcoreinfo_size)
return;
vmcoreinfo_append_str("CRASHTIME=%d", xtime.tv_sec);
buf = (u32 *)vmcoreinfo_note;
buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
vmcoreinfo_size);
final_note(buf);
}
void vmcoreinfo_append_str(const char *fmt, ...)
{
va_list args;
char buf[0x50];
int r;
va_start(args, fmt);
r = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (r + vmcoreinfo_size > vmcoreinfo_max_size)
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 __attribute__ ((weak)) arch_crash_save_vmcoreinfo(void)
{}
unsigned long __attribute__ ((weak)) paddr_vmcoreinfo_note(void)
{
return __pa((unsigned long)(char *)&vmcoreinfo_note);
}
static int __init crash_save_vmcoreinfo_init(void)
{
vmcoreinfo_append_str("OSRELEASE=%s\n", UTS_RELEASE);
vmcoreinfo_append_str("PAGESIZE=%d\n", PAGE_SIZE);
SYMBOL(init_uts_ns);
SYMBOL(node_online_map);
SYMBOL(swapper_pg_dir);
SYMBOL(_stext);
#ifndef CONFIG_NEED_MULTIPLE_NODES
SYMBOL(mem_map);
SYMBOL(contig_page_data);
#endif
#ifdef CONFIG_SPARSEMEM
SYMBOL(mem_section);
LENGTH(mem_section, NR_SECTION_ROOTS);
SIZE(mem_section);
OFFSET(mem_section, section_mem_map);
#endif
SIZE(page);
SIZE(pglist_data);
SIZE(zone);
SIZE(free_area);
SIZE(list_head);
OFFSET(page, flags);
OFFSET(page, _count);
OFFSET(page, mapping);
OFFSET(page, lru);
OFFSET(pglist_data, node_zones);
OFFSET(pglist_data, nr_zones);
#ifdef CONFIG_FLAT_NODE_MEM_MAP
OFFSET(pglist_data, node_mem_map);
#endif
OFFSET(pglist_data, node_start_pfn);
OFFSET(pglist_data, node_spanned_pages);
OFFSET(pglist_data, node_id);
OFFSET(zone, free_area);
OFFSET(zone, vm_stat);
OFFSET(zone, spanned_pages);
OFFSET(free_area, free_list);
OFFSET(list_head, next);
OFFSET(list_head, prev);
LENGTH(zone.free_area, MAX_ORDER);
arch_crash_save_vmcoreinfo();
return 0;
}
module_init(crash_save_vmcoreinfo_init)
......@@ -61,6 +61,15 @@ static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page)
return sprintf(page, "%d\n", !!kexec_crash_image);
}
KERNEL_ATTR_RO(kexec_crash_loaded);
static ssize_t vmcoreinfo_show(struct kset *kset, char *page)
{
return sprintf(page, "%lx %x\n",
paddr_vmcoreinfo_note(),
vmcoreinfo_max_size);
}
KERNEL_ATTR_RO(vmcoreinfo);
#endif /* CONFIG_KEXEC */
/*
......@@ -96,6 +105,7 @@ static struct attribute * kernel_attrs[] = {
#ifdef CONFIG_KEXEC
&kexec_loaded_attr.attr,
&kexec_crash_loaded_attr.attr,
&vmcoreinfo_attr.attr,
#endif
NULL
};
......
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