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[Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop issue for

To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop issue for Deep C state
From: "Wei, Gang" <gang.wei@xxxxxxxxx>
Date: Mon, 14 Jul 2008 16:57:02 +0800
Cc: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx>
Delivery-date: Mon, 14 Jul 2008 01:57:47 -0700
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Thread-topic: [PATCH]PIT broadcast to fix local APIC timer stop issue for Deep C state
Local APIC timer may stop at deep C state (C3/C4...) entry/exit. Initial
HPET broadcast working in legacy replacing mode, broke RTC intr, so was
bypassed. This patch add the logic that use platform timer (PIT) to
reenable local APIC timer at C state entry/exit.

Currently, only keep PIT enabled with 100Hz freq. The next step is
trying to dynamically enable/disable PIT while needed, and give it lower
freq.

signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>
signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>
signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>

Jimmy

Attachment: pit_broadcast.patch
Description: pit_broadcast.patch

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