Moorestown systems crash on boot because the secondary CPU
clockevent (apbt1) will fail to request irq#1, which does not
have ioapic chip in its irq_desc[] entry.
Background:
Moorestown platform does not have ISA bus nor legacy IRQs. It
reuses the range of legacy IRQs for regular device interrupts.
The routing information of early system device IRQs (timers) are
obtained from firmware provided SFI tables. We reuse/fake MP
configuration table to facilitate IRQ setup with IOAPIC.
Maintaining a 1:1 mapping of IOAPIC pin (RTE entry) and IRQ#
makes routing information clean and easy to understand on
Moorestown. Though optional.
This patch allows SFI timer and vRTC IRQ to be treated as ISA
IRQ so that pin2irq mapping will be 1:1.
Also fixed MP table type and use macros to clearly set MP IRQ
entries. As a result, apbt timer and RTC interrupts on
Moorestown are within legacy IRQ range:
# cat /proc/interrupts
CPU0 CPU1
0: 11249 0 IO-APIC-edge apbt0
1: 0 12271 IO-APIC-edge apbt1
8: 887 0 IO-APIC-fasteoi dw_spi
13: 0 0 IO-APIC-fasteoi INTEL_MID_DMAC2
14: 0 0 IO-APIC-fasteoi rtc0
Further discussion of this patch can be found at:
https://lkml.org/lkml/2010/6/10/70
Suggested-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Link: http://lkml.kernel.org/r/1302286980-21139-1-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
9d90e49da5