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    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.
    --


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