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-rw-r--r--arch/ia64/kernel/crash.c83
1 files changed, 57 insertions, 26 deletions
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index f065093..6631a9d 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -23,6 +23,7 @@
int kdump_status[NR_CPUS];
static atomic_t kdump_cpu_frozen;
atomic_t kdump_in_progress;
+static int kdump_freeze_monarch;
static int kdump_on_init = 1;
static int kdump_on_fatal_mca = 1;
@@ -108,10 +109,38 @@ 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();
/* not all cpu response to IPI, send INIT to freeze them */
- if (kdump_wait_cpu_freeze() && kdump_on_init) {
+ if (kdump_wait_cpu_freeze()) {
kdump_smp_send_init();
+ /* wait again, don't go ahead if possible */
+ kdump_wait_cpu_freeze();
}
#endif
}
@@ -129,17 +158,17 @@ 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;
+
+ ia64_set_psr_mc(); /* mask MCA/INIT and stop reentrance */
+
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();
}
@@ -150,6 +179,20 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
struct ia64_mca_notify_die *nd;
struct die_args *args = data;
+ 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;
@@ -162,43 +205,31 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
}
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;
+ /* 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:
- if (kdump_on_init)
+ /* 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_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:
/* *(nd->data) indicate if MCA is recoverable */
if (kdump_on_fatal_mca && !(*(nd->data))) {
- atomic_set(&kdump_in_progress, 1);
- *(nd->monarch_cpu) = -1;
- machine_kdump_on_init();
+ if (atomic_inc_return(&kdump_in_progress) == 1)
+ machine_kdump_on_init();
+ /* We got fatal MCA while kdump!? No way!! */
}
break;
}
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