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linux-next/arch/ia64/kernel/crash.c
Hidetoshi Seto b0247a55f4 [IA64] kdump: add kdump_on_fatal_mca
While it is convenient that we can invoke kdump by asserting INIT
via button on chassis etc., there are some situations that invoking
kdump on fatal MCA is not welcomed rather than rebooting fast without
dump.

This patch adds a new flag 'kdump_on_fatal_mca' that is independent
from 'kdump_on_init' currently available.  Adding this flag enable
us to turning on/off of kdump depend on the event, INIT and/or fatal
MCA.  Default for this flag is to take the dump.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-04-09 09:53:00 -07:00

258 lines
5.8 KiB
C

/*
* arch/ia64/kernel/crash.c
*
* Architecture specific (ia64) functions for kexec based crash dumps.
*
* Created by: Khalid Aziz <khalid.aziz@hp.com>
* Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2005 Intel Corp Zou Nan hai <nanhai.zou@intel.com>
*
*/
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/crash_dump.h>
#include <linux/bootmem.h>
#include <linux/kexec.h>
#include <linux/elfcore.h>
#include <linux/sysctl.h>
#include <linux/init.h>
#include <linux/kdebug.h>
#include <asm/mca.h>
int kdump_status[NR_CPUS];
static atomic_t kdump_cpu_frozen;
atomic_t kdump_in_progress;
static int kdump_on_init = 1;
static int kdump_on_fatal_mca = 1;
static inline Elf64_Word
*append_elf_note(Elf64_Word *buf, char *name, unsigned 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 += (sizeof(*note) + 3)/4;
memcpy(buf, name, note->n_namesz);
buf += (note->n_namesz + 3)/4;
memcpy(buf, data, data_len);
buf += (data_len + 3)/4;
return buf;
}
static void
final_note(void *buf)
{
memset(buf, 0, sizeof(struct elf_note));
}
extern void ia64_dump_cpu_regs(void *);
static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
void
crash_save_this_cpu(void)
{
void *buf;
unsigned long cfm, sof, sol;
int cpu = smp_processor_id();
struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
memset(prstatus, 0, sizeof(*prstatus));
prstatus->pr_pid = current->pid;
ia64_dump_cpu_regs(dst);
cfm = dst[43];
sol = (cfm >> 7) & 0x7f;
sof = cfm & 0x7f;
dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
sof - sol);
buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
if (!buf)
return;
buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus,
sizeof(*prstatus));
final_note(buf);
}
#ifdef CONFIG_SMP
static int
kdump_wait_cpu_freeze(void)
{
int cpu_num = num_online_cpus() - 1;
int timeout = 1000;
while(timeout-- > 0) {
if (atomic_read(&kdump_cpu_frozen) == cpu_num)
return 0;
udelay(1000);
}
return 1;
}
#endif
void
machine_crash_shutdown(struct pt_regs *pt)
{
/* This function is only called after the system
* has paniced or is otherwise in a critical state.
* The minimum amount of code to allow a kexec'd kernel
* to run successfully needs to happen here.
*
* In practice this means shooting down the other cpus in
* an SMP system.
*/
kexec_disable_iosapic();
#ifdef CONFIG_SMP
kdump_smp_send_stop();
/* not all cpu response to IPI, send INIT to freeze them */
if (kdump_wait_cpu_freeze() && kdump_on_init) {
kdump_smp_send_init();
}
#endif
}
static void
machine_kdump_on_init(void)
{
local_irq_disable();
kexec_disable_iosapic();
machine_kexec(ia64_kimage);
}
void
kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
{
int cpuid;
local_irq_disable();
cpuid = smp_processor_id();
crash_save_this_cpu();
current->thread.ksp = (__u64)info->sw - 16;
atomic_inc(&kdump_cpu_frozen);
kdump_status[cpuid] = 1;
mb();
#ifdef CONFIG_HOTPLUG_CPU
if (cpuid != 0)
ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
#endif
for (;;)
cpu_relax();
}
static int
kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
{
struct ia64_mca_notify_die *nd;
struct die_args *args = data;
if (!kdump_on_init && !kdump_on_fatal_mca)
return NOTIFY_DONE;
if (!ia64_kimage) {
if (val == DIE_INIT_MONARCH_LEAVE)
ia64_mca_printk(KERN_NOTICE
"%s: kdump not configured\n",
__func__);
return NOTIFY_DONE;
}
if (val != DIE_INIT_MONARCH_LEAVE &&
val != DIE_INIT_SLAVE_LEAVE &&
val != DIE_INIT_MONARCH_PROCESS &&
val != DIE_MCA_RENDZVOUS_LEAVE &&
val != DIE_MCA_MONARCH_LEAVE)
return NOTIFY_DONE;
nd = (struct ia64_mca_notify_die *)args->err;
/* Reason code 1 means machine check rendezvous*/
if ((val == DIE_INIT_MONARCH_LEAVE || val == DIE_INIT_SLAVE_LEAVE
|| val == DIE_INIT_MONARCH_PROCESS) && nd->sos->rv_rc == 1)
return NOTIFY_DONE;
switch (val) {
case DIE_INIT_MONARCH_PROCESS:
if (kdump_on_init) {
atomic_set(&kdump_in_progress, 1);
*(nd->monarch_cpu) = -1;
}
break;
case DIE_INIT_MONARCH_LEAVE:
if (kdump_on_init)
machine_kdump_on_init();
break;
case DIE_INIT_SLAVE_LEAVE:
if (atomic_read(&kdump_in_progress))
unw_init_running(kdump_cpu_freeze, NULL);
break;
case DIE_MCA_RENDZVOUS_LEAVE:
if (atomic_read(&kdump_in_progress))
unw_init_running(kdump_cpu_freeze, NULL);
break;
case DIE_MCA_MONARCH_LEAVE:
/* die_register->signr indicate if MCA is recoverable */
if (kdump_on_fatal_mca && !args->signr) {
atomic_set(&kdump_in_progress, 1);
*(nd->monarch_cpu) = -1;
machine_kdump_on_init();
}
break;
}
return NOTIFY_DONE;
}
#ifdef CONFIG_SYSCTL
static ctl_table kdump_ctl_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "kdump_on_init",
.data = &kdump_on_init,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = CTL_UNNUMBERED,
.procname = "kdump_on_fatal_mca",
.data = &kdump_on_fatal_mca,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{ .ctl_name = 0 }
};
static ctl_table sys_table[] = {
{
.ctl_name = CTL_KERN,
.procname = "kernel",
.mode = 0555,
.child = kdump_ctl_table,
},
{ .ctl_name = 0 }
};
#endif
static int
machine_crash_setup(void)
{
/* be notified before default_monarch_init_process */
static struct notifier_block kdump_init_notifier_nb = {
.notifier_call = kdump_init_notifier,
.priority = 1,
};
int ret;
if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
return ret;
#ifdef CONFIG_SYSCTL
register_sysctl_table(sys_table);
#endif
return 0;
}
__initcall(machine_crash_setup);