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powerpc/powernv: Support OPAL requested heartbeat

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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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2014-11-14 16:13:50 +11:00
parent 3f77df7f81
commit 3bf57561d4
1 changed files with 30 additions and 0 deletions
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30
arch/powerpc/platforms/powernv/opal.c
View file

@ -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;