[RFC][PATCH 1/3] Embed vmcoreinfo into kernel file
Ken'ichi Ohmichi
oomichi at mxs.nes.nec.co.jp
Mon Aug 13 03:36:53 EDT 2007
Patches:
- [1/3] patch for linux-2.6.22.
Changelog:
* Rename "mkdfinfo" to "vmcoreinfo".
* Multi memory models (FLATMEM, DISCONTIGMEM, and SPASEMEM) are
supported.
* The elf note typedef for vmcoreinfo is added because the original
elf note size is limited to 1024.
* The generation of the elf note is moved to boot time instead of
crash time.
---
Signed-off-by: Dan Aloni <da-x at monatomic.org>
Signed-off-by: Ken'ichi Ohmichi <oomichi at mxs.nes.nec.co.jp>
---
diff -rpuN linux-2.6.22.org/arch/ia64/mm/discontig.c linux-2.6.22/arch/ia64/mm/discontig.c
--- linux-2.6.22.org/arch/ia64/mm/discontig.c 2007-08-04 00:22:33.000000000 +0900
+++ linux-2.6.22/arch/ia64/mm/discontig.c 2007-08-07 00:34:50.000000000 +0900
@@ -47,7 +47,7 @@ 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
diff -rpuN linux-2.6.22.org/include/linux/kexec.h linux-2.6.22/include/linux/kexec.h
--- linux-2.6.22.org/include/linux/kexec.h 2007-08-04 00:22:35.000000000 +0900
+++ linux-2.6.22/include/linux/kexec.h 2007-08-07 00:34:50.000000000 +0900
@@ -121,6 +121,8 @@ extern struct page *kimage_alloc_control
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);
+
extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;
@@ -148,11 +150,19 @@ 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;
#else /* !CONFIG_KEXEC */
diff -rpuN linux-2.6.22.org/kernel/kexec.c linux-2.6.22/kernel/kexec.c
--- linux-2.6.22.org/kernel/kexec.c 2007-08-04 00:22:33.000000000 +0900
+++ linux-2.6.22/kernel/kexec.c 2007-08-07 00:35:10.000000000 +0900
@@ -22,6 +22,10 @@
#include <linux/hardirq.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
+#include <linux/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/mmzone.h>
+#include <linux/numa.h>
#include <asm/page.h>
#include <asm/uaccess.h>
@@ -32,6 +36,12 @@
/* 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",
@@ -1135,3 +1145,133 @@ static int __init crash_notes_memory_ini
return 0;
}
module_init(crash_notes_memory_init)
+
+void crash_save_vmcoreinfo(void)
+{
+ u32 *buf;
+
+ if (!vmcoreinfo_size)
+ return;
+
+ 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;
+}
+
+#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)
+
+static int __init crash_save_vmcoreinfo_init(void)
+{
+#ifndef CONFIG_X86_32
+ extern char _stext;
+#endif
+#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
+#ifdef CONFIG_IA64
+ extern pg_data_t *pgdat_list[MAX_NUMNODES];
+#endif
+#endif
+ 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
+
+#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
+#ifdef CONFIG_IA64
+ 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);
+ OFFSET(node_memblk_s, nid);
+#else
+ SYMBOL(node_data);
+ LENGTH(node_data, MAX_NUMNODES);
+#endif
+#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);
+#ifdef CONFIG_X86_PAE
+ vmcoreinfo_append_str("CONFIG_X86_PAE=y\n");
+#endif
+
+#ifdef CONFIG_IA64
+#ifdef CONFIG_PGTABLE_3
+ vmcoreinfo_append_str("CONFIG_PGTABLE_3=y\n");
+#elif CONFIG_PGTABLE_4
+ vmcoreinfo_append_str("CONFIG_PGTABLE_4=y\n");
+#endif
+#endif
+ crash_save_vmcoreinfo();
+
+ return 0;
+}
+
+module_init(crash_save_vmcoreinfo_init)
diff -rpuN linux-2.6.22.org/kernel/ksysfs.c linux-2.6.22/kernel/ksysfs.c
--- linux-2.6.22.org/kernel/ksysfs.c 2007-08-04 00:22:33.000000000 +0900
+++ linux-2.6.22/kernel/ksysfs.c 2007-08-07 00:34:50.000000000 +0900
@@ -60,6 +60,15 @@ static ssize_t kexec_crash_loaded_show(s
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",
+ __pa((unsigned long)(char *)&vmcoreinfo_note),
+ vmcoreinfo_size);
+}
+KERNEL_ATTR_RO(vmcoreinfo);
+
#endif /* CONFIG_KEXEC */
decl_subsys(kernel, NULL, NULL);
@@ -73,6 +82,7 @@ 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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