Commit 311f594d authored by Jay Lan's avatar Jay Lan Committed by Tony Luck
Browse files

[IA64] kdump on INIT needs multi-nodes sync-up (v.2) 



The current implementation of kdump on INIT events would enter
kdump processing on DIE_INIT_MONARCH_ENTER and DIE_INIT_SLAVE_ENTER
events. Thus, the monarch cpu would go ahead and boot up the kdump

On SN shub2 systems, this out-of-sync situation causes some slave
cpus on different nodes to enter POD.

This patch moves kdump entry points to DIE_INIT_MONARCH_LEAVE and
DIE_INIT_SLAVE_LEAVE. It also sets kdump_in_progress variable in
the DIE_INIT_MONARCH_PROCESS event to not dump all active stack
traces to the console in the case of kdump.

I have tested this patch on an SN machine and a HP RX2600.

Signed-off-by: default avatarJay Lan <jlan@sgi.com>
Acked-by: default avatarZou Nan hai <nanhai.zou@intel.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent ae67e498

arch/ia64/kernel/crash.c

+15 −7
Original line number Diff line number Diff line
@@ -156,23 +156,29 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) 
	if (!kdump_on_init)

		return NOTIFY_DONE;



	if (val != DIE_INIT_MONARCH_ENTER &&

	    val != DIE_INIT_SLAVE_ENTER &&

	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_ENTER || val == DIE_INIT_SLAVE_ENTER) &&

		 nd->sos->rv_rc == 1)

	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_ENTER:

		case DIE_INIT_MONARCH_PROCESS:

			atomic_set(&kdump_in_progress, 1);

			*(nd->monarch_cpu) = -1;

			break;

		case DIE_INIT_MONARCH_LEAVE:

			machine_kdump_on_init();

			break;

		case DIE_INIT_SLAVE_ENTER:

		case DIE_INIT_SLAVE_LEAVE:

			if (atomic_read(&kdump_in_progress))

				unw_init_running(kdump_cpu_freeze, NULL);

			break;

		case DIE_MCA_RENDZVOUS_LEAVE:
@@ -215,8 +221,10 @@ static ctl_table sys_table[] = { 
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)

arch/ia64/kernel/mca.c

+4 −0
Original line number Diff line number Diff line
@@ -1477,6 +1477,10 @@ default_monarch_init_process(struct notifier_block *self, unsigned long val, voi 
	struct task_struct *g, *t;

	if (val != DIE_INIT_MONARCH_PROCESS)

		return NOTIFY_DONE;

#ifdef CONFIG_KEXEC

	if (atomic_read(&kdump_in_progress))

		return NOTIFY_DONE;

#endif



	/*

	 * FIXME: mlogbuf will brim over with INIT stack dumps.

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