Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254// SPDX-License-Identifier: GPL-2.0-only/* * crash.c - kernel crash support code. * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com> */
#include <linux/buildid.h>#include <linux/init.h>#include <linux/utsname.h>#include <linux/vmalloc.h>#include <linux/sizes.h>#include <linux/kexec.h>#include <linux/memory.h>#include <linux/cpuhotplug.h>#include <linux/memblock.h>#include <linux/kmemleak.h>
#include <asm/page.h>#include <asm/sections.h>
#include "kallsyms_internal.h"#include "kexec_internal.h"
/* vmcoreinfo stuff */unsigned char *vmcoreinfo_data;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;
struct hwerr_info { atomic_t count; time64_t timestamp;};
/* * The hwerr_data[] array is declared with global scope so that it remains * accessible to vmcoreinfo even when Link Time Optimization (LTO) is enabled. */struct hwerr_info hwerr_data[HWERR_RECOV_MAX];
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=%lld\n", ktime_get_real_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;
WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES, "vmcoreinfo data exceeds allocated size, truncating");}
/* * 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);}EXPORT_SYMBOL(paddr_vmcoreinfo_note);
void hwerr_log_error_type(enum hwerr_error_type src){ if (src < 0 || src >= HWERR_RECOV_MAX) return;
atomic_inc(&hwerr_data[src].count); WRITE_ONCE(hwerr_data[src].timestamp, ktime_get_real_seconds());}EXPORT_SYMBOL_GPL(hwerr_log_error_type);
static int __init crash_save_vmcoreinfo_init(void){ int order; order = get_order(VMCOREINFO_BYTES); vmcoreinfo_data = (unsigned char *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 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_pages((unsigned long)vmcoreinfo_data, order); vmcoreinfo_data = NULL; pr_warn("Memory allocation for vmcoreinfo_note failed\n"); return -ENOMEM; }
VMCOREINFO_OSRELEASE(init_uts_ns.name.release); VMCOREINFO_BUILD_ID(); VMCOREINFO_PAGESIZE(PAGE_SIZE);
VMCOREINFO_SYMBOL(init_uts_ns); VMCOREINFO_OFFSET(uts_namespace, name); VMCOREINFO_SYMBOL(node_online_map);#ifdef CONFIG_MMU VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);#endif VMCOREINFO_SYMBOL(_stext); vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", (unsigned long) VMALLOC_START);
#ifndef CONFIG_NUMA VMCOREINFO_SYMBOL(mem_map); VMCOREINFO_SYMBOL(contig_page_data);#endif#ifdef CONFIG_SPARSEMEM_VMEMMAP VMCOREINFO_SYMBOL_ARRAY(vmemmap);#endif#ifdef CONFIG_SPARSEMEM VMCOREINFO_SYMBOL_ARRAY(mem_section); VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); VMCOREINFO_STRUCT_SIZE(mem_section); VMCOREINFO_OFFSET(mem_section, section_mem_map); VMCOREINFO_NUMBER(SECTION_SIZE_BITS); VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);#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_info); VMCOREINFO_OFFSET(pglist_data, node_zones); VMCOREINFO_OFFSET(pglist_data, nr_zones);#ifdef CONFIG_FLATMEM 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, NR_PAGE_ORDERS); 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_swapbacked);#define PAGE_SLAB_MAPCOUNT_VALUE (PGTY_slab << 24) VMCOREINFO_NUMBER(PAGE_SLAB_MAPCOUNT_VALUE);#ifdef CONFIG_MEMORY_FAILURE VMCOREINFO_NUMBER(PG_hwpoison);#endif VMCOREINFO_NUMBER(PG_head_mask);#define PAGE_BUDDY_MAPCOUNT_VALUE (PGTY_buddy << 24) VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);#define PAGE_HUGETLB_MAPCOUNT_VALUE (PGTY_hugetlb << 24) VMCOREINFO_NUMBER(PAGE_HUGETLB_MAPCOUNT_VALUE);#define PAGE_OFFLINE_MAPCOUNT_VALUE (PGTY_offline << 24) VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);#ifdef CONFIG_UNACCEPTED_MEMORY#define PAGE_UNACCEPTED_MAPCOUNT_VALUE (PGTY_unaccepted << 24) VMCOREINFO_NUMBER(PAGE_UNACCEPTED_MAPCOUNT_VALUE);#endif
#ifdef CONFIG_KALLSYMS VMCOREINFO_SYMBOL(kallsyms_names); VMCOREINFO_SYMBOL(kallsyms_num_syms); VMCOREINFO_SYMBOL(kallsyms_token_table); VMCOREINFO_SYMBOL(kallsyms_token_index); VMCOREINFO_SYMBOL(kallsyms_offsets);#endif /* CONFIG_KALLSYMS */
arch_crash_save_vmcoreinfo(); update_vmcoreinfo_note();
return 0;}
subsys_initcall(crash_save_vmcoreinfo_init);