lkml.org 
[lkml]   [2008]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 6/6] ia64 UV: Use blinking LED for heartbeat display
  * Add a function to blink the "heartbeat" LED indicating
that the CPU is responding to timer interrupts.

* Introduces a callback for "heartbeat" display in the
clocksource_watchdog function, which in turn requires
CONFIG_CLOCKSOURCE_WATCHDOG to be set.

Note that this is a RAS feature that allows external monitoring of
various cpu state indicators, not just providing "pretty blinking
lights", as the LED state is readable by the system controller.

Based on linux-2.6.tip/master.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Tony Luck <tony.luck@intel.com>
---
arch/ia64/uv/kernel/setup.c | 28 ++++++++++++++++++++++++++++
include/asm-ia64/uv/uv_hub.h | 4 ++++
2 files changed, 32 insertions(+)
--- linux-2.6.tip.orig/arch/ia64/uv/kernel/setup.c
+++ linux-2.6.tip/arch/ia64/uv/kernel/setup.c
@@ -8,6 +8,7 @@
* Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
*/

+#include <linux/clocksource.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <asm/sn/simulator.h>
@@ -65,6 +66,25 @@ static void uv_idle(int state)
uv_set_led_bits(LED_CPU_ACTIVITY, LED_CPU_ACTIVITY);
}

+#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
+static void uv_display_heartbeat(void)
+{
+ int cpu;
+
+ uv_hub_info->uv_heartbeat = nr_cpu_ids;
+
+ for_each_online_cpu(cpu) {
+ struct uv_hub_info_s *hub = uv_cpu_hub_info(cpu);
+
+ if (hub->led_heartbeat_count > 0) {
+ uv_set_led_bits_on(cpu, LED_CPU_BLINK,
+ LED_CPU_HEARTBEAT);
+ --hub->led_heartbeat_count;
+ }
+ }
+}
+#endif
+
void __init uv_setup(char **cmdline_p)
{
union uvh_si_addr_map_config_u m_n_config;
@@ -124,4 +144,12 @@ void __init uv_setup(char **cmdline_p)

/* enable idle callback */
ia64_mark_idle = &uv_idle;
+
+#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
+ /* enable heartbeat display callback */
+ display_heartbeat = uv_display_heartbeat;
+#else
+ printk(KERN_NOTICE "UV: CLOCKSOURCE_WATCHDOG not configured, "
+ "LED Heartbeat NOT enabled\n");
+#endif
}
--- linux-2.6.tip.orig/include/asm-ia64/uv/uv_hub.h
+++ linux-2.6.tip/include/asm-ia64/uv/uv_hub.h
@@ -100,6 +100,7 @@ struct uv_hub_info_s {
unsigned long lowmem_remap_top;
unsigned long lowmem_remap_base;
unsigned long led_offset;
+ unsigned int led_heartbeat_count;
unsigned short pnode;
unsigned short pnode_mask;
unsigned short coherency_domain_number;
@@ -153,6 +154,9 @@ DECLARE_PER_CPU(struct uv_hub_info_s, __
/* idle callback */
extern void (*ia64_mark_idle) (int);

+/* idle callback */
+extern void (*ia64_mark_idle) (int);
+
/*
* Macros for converting between kernel virtual addresses, socket local physical
* addresses, and UV global physical addresses.
--


\
 
 \ /
  Last update: 2008-08-08 03:01    [W:0.153 / U:0.744 seconds]
©2003-2014 Jasper Spaans. Advertise on this site