[PATCH] x86: add write_pci_config_byte() to direct PCI access routines
commit274e1bbdeeaf16e71418f11f5f305ab26061f2c2
authorSiddha, Suresh B <suresh.b.siddha@intel.com>
Thu, 7 Dec 2006 01:14:10 +0000 (7 02:14 +0100)
committerAndi Kleen <andi@basil.nowhere.org>
Thu, 7 Dec 2006 01:14:10 +0000 (7 02:14 +0100)
treec3be672dde01817b34137d0b8d0dea563fdffabb
parent79929fd1c1887d2a057cbb80d487a2e2f1c01a02
[PATCH] x86: add write_pci_config_byte() to direct PCI access routines

Mechanism of selecting physical mode in genapic when cpu hotplug is enabled on
x86_64, broke the quirk(quirk_intel_irqbalance()) introduced for working
around the transposing interrupt message errata in E7520/E7320/E7525 (revision
ID 0x9 and below.  errata #23 in
http://download.intel.com/design/chipsets/specupdt/30304203.pdf).

This errata requires the mode to be in logical flat, so that interrupts can be
directed to more than one cpu(and thus use hardware IRQ balancing enabled by
BIOS on these platforms).

Following four patches fixes this by moving the quirk to early quirk and
forcing the x86_64 genapic selection to logical flat on these platforms.

Thanks to Shaohua for pointing out the breakage.

This patch:

Add write_pci_config_byte() to direct PCI access  routines

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
arch/i386/pci/early.c
include/asm-x86_64/pci-direct.h