#include <linux/elfcore.h>
#include <linux/sysctl.h>
#include <linux/init.h>
+#include <linux/kdebug.h>
-#include <asm/kdebug.h>
#include <asm/mca.h>
int kdump_status[NR_CPUS];
-atomic_t kdump_cpu_freezed;
+static atomic_t kdump_cpu_frozen;
atomic_t kdump_in_progress;
-int kdump_on_init = 1;
+static int kdump_freeze_monarch;
+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,
static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
void
-crash_save_this_cpu()
+crash_save_this_cpu(void)
{
void *buf;
unsigned long cfm, sof, sol;
buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
if (!buf)
return;
- buf = append_elf_note(buf, "CORE", NT_PRSTATUS, prstatus,
+ 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_freezed) == cpu_num)
+ if (atomic_read(&kdump_cpu_frozen) == cpu_num)
return 0;
udelay(1000);
}
return 1;
}
+#endif
void
machine_crash_shutdown(struct pt_regs *pt)
*/
kexec_disable_iosapic();
#ifdef CONFIG_SMP
+ /*
+ * If kdump_on_init is set and an INIT is asserted here, kdump will
+ * be started again via INIT monarch.
+ */
+ local_irq_disable();
+ ia64_set_psr_mc(); /* mask MCA/INIT */
+ if (atomic_inc_return(&kdump_in_progress) != 1)
+ unw_init_running(kdump_cpu_freeze, NULL);
+
+ /*
+ * Now this cpu is ready for kdump.
+ * Stop all others by IPI or INIT. They could receive INIT from
+ * outside and might be INIT monarch, but only thing they have to
+ * do is falling into kdump_cpu_freeze().
+ *
+ * If an INIT is asserted here:
+ * - All receivers might be slaves, since some of cpus could already
+ * be frozen and INIT might be masked on monarch. In this case,
+ * all slaves will be frozen soon since kdump_in_progress will let
+ * them into DIE_INIT_SLAVE_LEAVE.
+ * - One might be a monarch, but INIT rendezvous will fail since
+ * at least this cpu already have INIT masked so it never join
+ * to the rendezvous. In this case, all slaves and monarch will
+ * be frozen soon with no wait since the INIT rendezvous is skipped
+ * by kdump_in_progress.
+ */
kdump_smp_send_stop();
- if (kdump_wait_cpu_freeze() && kdump_on_init) {
- //not all cpu response to IPI, send INIT to freeze them
+ /* not all cpu response to IPI, send INIT to freeze them */
+ if (kdump_wait_cpu_freeze()) {
kdump_smp_send_init();
+ /* wait again, don't go ahead if possible */
+ kdump_wait_cpu_freeze();
}
#endif
}
static void
machine_kdump_on_init(void)
{
+ crash_save_vmcoreinfo();
local_irq_disable();
kexec_disable_iosapic();
machine_kexec(ia64_kimage);
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_freezed);
+
+ ia64_set_psr_mc(); /* mask MCA/INIT and stop reentrance */
+
+ atomic_inc(&kdump_cpu_frozen);
kdump_status[cpuid] = 1;
mb();
- if (cpuid == 0) {
- for (;;)
- cpu_relax();
- } else
- ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
+ for (;;)
+ cpu_relax();
}
static int
struct ia64_mca_notify_die *nd;
struct die_args *args = data;
- if (!kdump_on_init)
+ if (atomic_read(&kdump_in_progress)) {
+ switch (val) {
+ case DIE_INIT_MONARCH_LEAVE:
+ if (!kdump_freeze_monarch)
+ break;
+ /* fall through */
+ case DIE_INIT_SLAVE_LEAVE:
+ case DIE_INIT_MONARCH_ENTER:
+ case DIE_MCA_RENDZVOUS_LEAVE:
+ unw_init_running(kdump_cpu_freeze, NULL);
+ break;
+ }
+ }
+
+ if (!kdump_on_init && !kdump_on_fatal_mca)
return NOTIFY_DONE;
- if (val != DIE_INIT_MONARCH_ENTER &&
- val != DIE_INIT_SLAVE_ENTER &&
- val != DIE_MCA_RENDZVOUS_LEAVE &&
+ 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_MONARCH_PROCESS &&
val != DIE_MCA_MONARCH_LEAVE)
return NOTIFY_DONE;
nd = (struct ia64_mca_notify_die *)args->err;
- /* Reason code 1 means machine check rendezous*/
- if ((val == DIE_INIT_MONARCH_ENTER || DIE_INIT_SLAVE_ENTER) &&
- nd->sos->rv_rc == 1)
- return NOTIFY_DONE;
switch (val) {
- case DIE_INIT_MONARCH_ENTER:
+ case DIE_INIT_MONARCH_PROCESS:
+ /* Reason code 1 means machine check rendezvous*/
+ if (kdump_on_init && (nd->sos->rv_rc != 1)) {
+ if (atomic_inc_return(&kdump_in_progress) != 1)
+ kdump_freeze_monarch = 1;
+ }
+ break;
+ case DIE_INIT_MONARCH_LEAVE:
+ /* Reason code 1 means machine check rendezvous*/
+ if (kdump_on_init && (nd->sos->rv_rc != 1))
machine_kdump_on_init();
- break;
- case DIE_INIT_SLAVE_ENTER:
- 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 (!args->signr)
+ break;
+ case DIE_MCA_MONARCH_LEAVE:
+ /* *(nd->data) indicate if MCA is recoverable */
+ if (kdump_on_fatal_mca && !(*(nd->data))) {
+ if (atomic_inc_return(&kdump_in_progress) == 1)
machine_kdump_on_init();
- break;
+ /* We got fatal MCA while kdump!? No way!! */
+ }
+ break;
}
return NOTIFY_DONE;
}
#ifdef CONFIG_SYSCTL
-static ctl_table kdump_on_init_table[] = {
+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,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .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_on_init_table,
+ .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, 0);
+ register_sysctl_table(sys_table);
#endif
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff