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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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