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 <b...@kernel.crashing.org>
---
arch/powerpc/platforms/powernv/opal.c | 64 ++++++++++++++++++++++++++++++-----
1 file changed, 55 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/opal.c
b/arch/powerpc/platforms/powernv/opal.c
index f1e0d8c..0153064 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -22,6 +22,8 @@
#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)
{
@@ -633,17 +636,9 @@ static void opal_ipmi_init(struct device_node *opal_node)
of_platform_device_create(np, NULL, NULL);
}
-static int __init opal_init(void)
+static void opal_console_create_devs(void)
{
struct device_node *np, *consoles;
- const __be32 *irqs;
- int rc, i, irqlen;
-
- opal_node = of_find_node_by_path("/ibm,opal");
- if (!opal_node) {
- pr_warn("opal: Node not found\n");
- return -ENODEV;
- }
/* Register OPAL consoles if any ports */
if (firmware_has_feature(FW_FEATURE_OPALv2))
@@ -659,6 +654,13 @@ static int __init opal_init(void)
of_node_put(consoles);
}
+}
+
+static void opal_request_interrupts(void)
+{
+ const __be32 *irqs;
+ int rc, i, irqlen;
+
/* Find all OPAL interrupts and request them */
irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
pr_debug("opal: Found %d interrupts reserved for OPAL\n",
@@ -678,6 +680,49 @@ static int __init opal_init(void)
" (0x%x)\n", rc, irq, hwirq);
opal_irqs[i] = irq;
}
+}
+
+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-freq",
+ &opal_heartbeat) != 0)
+ opal_heartbeat = 0;
+
+ if (opal_heartbeat)
+ kthread_run(kopald, NULL, "kopald");
+}
+
+static int __init opal_init(void)
+{
+ int rc;
+
+ opal_node = of_find_node_by_path("/ibm,opal");
+ if (!opal_node) {
+ pr_warn("opal: Node not found\n");
+ return -ENODEV;
+ }
+
+ /* Setup a heatbeat thread if requested by OPAL */
+ opal_init_heartbeat();
+
+ /* Create console platform devices */
+ opal_console_create_devs();
+
+ /* Register OPAL interrupts */
+ opal_request_interrupts();
/* Create "opal" kobject under /sys/firmware */
rc = opal_sysfs_init();
@@ -696,6 +741,7 @@ static int __init opal_init(void)
opal_msglog_init();
}
+ /* Initialize OPAL IPMI backend */
opal_ipmi_init(opal_node);
return 0;
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