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Commit 3bf57561 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc/powernv: Support OPAL requested heartbeat 



If OPAL requests it, call it back via opal_poll_events() at a
regular interval. Some versions of OPAL on some machines require
this to operate some internal timeouts properly.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 3f77df7f

arch/powerpc/platforms/powernv/opal.c

+30 −0
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ 
#include <linux/kobject.h>

#include <linux/delay.h>

#include <linux/memblock.h>

#include <linux/kthread.h>

#include <linux/freezer.h>



#include <asm/machdep.h>

#include <asm/opal.h>
@@ -58,6 +60,7 @@ static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 
static DEFINE_SPINLOCK(opal_notifier_lock);

static uint64_t last_notified_mask = 0x0ul;

static atomic_t opal_notifier_hold = ATOMIC_INIT(0);

static uint32_t opal_heartbeat;



static void opal_reinit_cores(void)

{
@@ -741,6 +744,29 @@ static void __init opal_irq_init(struct device_node *dn) 
	}

}



static int kopald(void *unused)

{

	set_freezable();

	do {

		try_to_freeze();

		opal_poll_events(NULL);

		msleep_interruptible(opal_heartbeat);

	} while (!kthread_should_stop());



	return 0;

}



static void opal_init_heartbeat(void)

{

	/* Old firwmware, we assume the HVC heartbeat is sufficient */

	if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",

				 &opal_heartbeat) != 0)

		opal_heartbeat = 0;



	if (opal_heartbeat)

		kthread_run(kopald, NULL, "kopald");

}



static int __init opal_init(void)

{

	struct device_node *np, *consoles;
@@ -769,6 +795,9 @@ static int __init opal_init(void) 
	/* Create i2c platform devices */

	opal_i2c_create_devs();



	/* Setup a heatbeat thread if requested by OPAL */

	opal_init_heartbeat();



	/* Find all OPAL interrupts and request them */

	opal_irq_init(opal_node);
@@ -791,6 +820,7 @@ static int __init opal_init(void) 
		opal_msglog_init();

	}



	/* Initialize OPAL IPMI backend */

	opal_ipmi_init(opal_node);



	return 0;