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    Subject[PATCH 5/6] ia64 UV: Use LED to indicate CPU is active
      * Add an idle callback to turn on/off a LED indicating that
    the CPU is "active" (ON) or "idle" (OFF).

    * Introduces a callback for "post-smp_cpus_done" processing
    to setup callback.

    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 | 19 +++++++++++++++++--
    include/asm-ia64/uv/uv_hub.h | 3 +++
    2 files changed, 20 insertions(+), 2 deletions(-)

    --- linux-2.6.tip.orig/arch/ia64/uv/kernel/setup.c
    +++ linux-2.6.tip/arch/ia64/uv/kernel/setup.c
    @@ -52,6 +52,19 @@ static __init void get_lowmem_redirect(u
    BUG();
    }

    +/*
    + * Illuminate "activity" LED when CPU is going "active",
    + * extinguish when going "idle".
    + */
    +static void uv_idle(int state)
    +{
    + if (state)
    + uv_set_led_bits(0, LED_CPU_ACTIVITY);
    +
    + else
    + uv_set_led_bits(LED_CPU_ACTIVITY, LED_CPU_ACTIVITY);
    +}
    +
    void __init uv_setup(char **cmdline_p)
    {
    union uvh_si_addr_map_config_u m_n_config;
    @@ -104,9 +117,11 @@ void __init uv_setup(char **cmdline_p)
    uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
    uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
    uv_cpu_hub_info(cpu)->coherency_domain_number = 0;/* ZZZ */
    - uv_cpu_hub_info(cpu)->led_offset = LED_LOCAL_MMR_BASE + lcpu;
    + uv_cpu_hub_info(cpu)->led_offset = LED_LOCAL_MMR_BASE + cpu;
    uv_cpu_hub_info(cpu)->led_state = 0;
    printk(KERN_DEBUG "UV cpu %d, nid %d\n", cpu, nid);
    }
    -}

    + /* enable idle callback */
    + ia64_mark_idle = &uv_idle;
    +}
    --- linux-2.6.tip.orig/include/asm-ia64/uv/uv_hub.h
    +++ linux-2.6.tip/include/asm-ia64/uv/uv_hub.h
    @@ -150,6 +150,9 @@ DECLARE_PER_CPU(struct uv_hub_info_s, __
    #define LED_CPU_BLINK 0xffff /* blink led */
    #define LED_CPU_HB_INTERVAL (HZ/2) /* blink once per second */

    +/* 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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