diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-07-10 11:16:59 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-12 08:45:07 +0200 |
| commit | 2d9579a124d746a3e0e0ba45e57d80800ee80807 (patch) | |
| tree | b95f34d75309ac8ae91c6ff0331731214ae1c93d /arch/x86/kernel/genapic_64.c | |
| parent | 6e1cb38a2aef7680975e71f23de187859ee8b158 (diff) | |
x64, x2apic/intr-remap: support for x2apic physical mode support
x2apic Physical mode support. By default we will use x2apic cluster mode.
x2apic physical mode can be selected using "x2apic_phys" boot parameter.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/genapic_64.c')
| -rw-r--r-- | arch/x86/kernel/genapic_64.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c index 792e21ba1a81..3940d8161f8b 100644 --- a/arch/x86/kernel/genapic_64.c +++ b/arch/x86/kernel/genapic_64.c @@ -30,6 +30,15 @@ DEFINE_PER_CPU(int, x2apic_extra_bits); struct genapic __read_mostly *genapic = &apic_flat; +static int x2apic_phys = 0; + +static int set_x2apic_phys_mode(char *arg) +{ + x2apic_phys = 1; + return 0; +} +early_param("x2apic_phys", set_x2apic_phys_mode); + static enum uv_system_type uv_system_type; /* @@ -39,9 +48,12 @@ void __init setup_apic_routing(void) { if (uv_system_type == UV_NON_UNIQUE_APIC) genapic = &apic_x2apic_uv_x; - else if (cpu_has_x2apic && intr_remapping_enabled) - genapic = &apic_x2apic_cluster; - else + else if (cpu_has_x2apic && intr_remapping_enabled) { + if (x2apic_phys) + genapic = &apic_x2apic_phys; + else + genapic = &apic_x2apic_cluster; + } else #ifdef CONFIG_ACPI /* * Quirk: some x86_64 machines can only use physical APIC mode |