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authorSuresh Siddha <suresh.b.siddha@intel.com>2010-01-18 12:10:48 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-22 15:18:13 -0800
commit25d5699981856908986c5afb712481a4c917e00b (patch)
tree9aae338738065a7c88ee31e478f28cacc3c28528 /arch/x86
parentc91ab0438c6700e4be078d64cfb01879986e3bde (diff)
x86, apic: use physical mode for IBM summit platforms
commit dfea91d5a7c795fd6f4e1a97489a98e4e767463e upstream. Chris McDermott from IBM confirmed that hurricane chipset in IBM summit platforms doesn't support logical flat mode. Irrespective of the other things like apic_id's, total number of logical cpu's, Linux kernel should default to physical mode for this system. The 32-bit kernel does so using the OEM checks for the IBM summit platform. Add a similar OEM platform check for the 64bit kernel too. Otherwise the linux kernel boot can hang on this platform under certain bios/platform settings. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Tested-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Chris McDermott <lcm@linux.vnet.ibm.com> Cc: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/apic/apic_flat_64.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index d0c99abc26c3..873f81f0bbd8 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -240,6 +240,11 @@ static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
printk(KERN_DEBUG "system APIC only can use physical flat");
return 1;
}
+
+ if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
+ printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
+ return 1;
+ }
#endif
return 0;