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SubjectRe: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver

* Mike Travis <> wrote:

> Subject: SGI X86 UV: Provide a System Activity Indicator driver
> The SGI UV system has no LEDS but uses one of the system controller
> regs to indicate the online internal state of the cpu. There is a
> heartbeat bit indicating that the cpu is responding to interrupts,
> and an idle bit indicating whether the cpu is idle when the heartbeat
> interrupt occurs. The current period is one second.
> When a cpu panics, an error code is written by BIOS to this same reg.
> This patchset provides the following:
> * x86_64: Add base functionality for writing to the specific SCIR's
> for each cpu.
> * heartbeat: Invert "heartbeat" bit to indicate the cpu is
> "interruptible". If the current thread is the idle thread,
> then indicate system is "idle".
> * if hotplug enabled, all bits are set (0xff) when the cpu is disabled.
> Based on linux-2.6.tip/master.
> Signed-off-by: Mike Travis <>
> ---
> arch/x86/include/asm/uv/uv_hub.h | 63 +++++++++++++++++++++++-
> arch/x86/kernel/genx2apic_uv_x.c | 102 +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 164 insertions(+), 1 deletion(-)

applied to tip/x86/uv, thanks Mike!

Please send the cpu_idle() cleanup patch separately.

Another minor thing i noticed:

@@ -130,7 +140,9 @@ struct uv_hub_info_s {
unsigned char blade_processor_id;
unsigned char m_val;
unsigned char n_val;
+ struct uv_scir_s scir;

please align the new field vertically, like they were aligned before -
by adding another tab to the whole lineup. (This will also make it
appear nicer when viewed together with followup definitions below this


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