diff options
Diffstat (limited to 'kernel/kexec.c')
| -rw-r--r-- | kernel/kexec.c | 117 |
1 files changed, 114 insertions, 3 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 25db14b89e82..e9f1b4ea504d 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -17,21 +17,30 @@ #include <linux/highmem.h> #include <linux/syscalls.h> #include <linux/reboot.h> -#include <linux/syscalls.h> #include <linux/ioport.h> #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]; +size_t vmcoreinfo_size; +size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data); + /* Location of the reserved area for the crash kernel */ struct resource crashk_res = { .name = "Crash kernel", @@ -776,7 +785,7 @@ static int kimage_load_normal_segment(struct kimage *image, size_t uchunk, mchunk; page = kimage_alloc_page(image, GFP_HIGHUSER, maddr); - if (page == 0) { + if (!page) { result = -ENOMEM; goto out; } @@ -835,7 +844,7 @@ static int kimage_load_crash_segment(struct kimage *image, size_t uchunk, mchunk; page = pfn_to_page(maddr >> PAGE_SHIFT); - if (page == 0) { + if (!page) { result = -ENOMEM; goto out; } @@ -1061,6 +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); } @@ -1135,3 +1145,104 @@ 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=%ld", get_seconds()); + + 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", init_uts_ns.name.release); + vmcoreinfo_append_str("PAGESIZE=%ld\n", PAGE_SIZE); + + VMCOREINFO_SYMBOL(init_uts_ns); + VMCOREINFO_SYMBOL(node_online_map); + VMCOREINFO_SYMBOL(swapper_pg_dir); + VMCOREINFO_SYMBOL(_stext); + +#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_SIZE(mem_section); + VMCOREINFO_OFFSET(mem_section, section_mem_map); +#endif + VMCOREINFO_SIZE(page); + VMCOREINFO_SIZE(pglist_data); + VMCOREINFO_SIZE(zone); + VMCOREINFO_SIZE(free_area); + VMCOREINFO_SIZE(list_head); + VMCOREINFO_TYPEDEF_SIZE(nodemask_t); + VMCOREINFO_OFFSET(page, flags); + VMCOREINFO_OFFSET(page, _count); + VMCOREINFO_OFFSET(page, mapping); + VMCOREINFO_OFFSET(page, lru); + 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_LENGTH(zone.free_area, MAX_ORDER); + VMCOREINFO_NUMBER(NR_FREE_PAGES); + + arch_crash_save_vmcoreinfo(); + + return 0; +} + +module_init(crash_save_vmcoreinfo_init) |
