x86/platform: Introduce APIC post-initialization callback

Some subarchitectures (such as vSMP) need to slightly adjust the
underlying APIC structure. Add an APIC post-initialization callback
to 'struct x86_platform_ops' for this purpose and use it for
adjusting the APIC structure on vSMP systems.

Signed-off-by: Ido Yariv <ido@wizery.com>
Acked-by: Shai Fultheim <shai@scalemp.com>
Link: http://lkml.kernel.org/r/1338675095-27260-1-git-send-email-ido@wizery.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 18 insertions, 9 deletions

diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 1b291da09e60..8616d5198e16 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -208,6 +208,9 @@ void __init default_setup_apic_routing(void)
 
 	if (apic->setup_apic_routing)
 		apic->setup_apic_routing();
+
+	if (x86_platform.apic_post_init)
+		x86_platform.apic_post_init();
 }
 
 void __init generic_apic_probe(void)
diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c
index 3fe986698929..1793dba7a741 100644
--- a/arch/x86/kernel/apic/probe_64.c
+++ b/arch/x86/kernel/apic/probe_64.c
@@ -23,11 +23,6 @@
 #include <asm/ipi.h>
 #include <asm/setup.h>
 
-static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
-{
-	return hard_smp_processor_id() >> index_msb;
-}
-
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  */
@@ -48,10 +43,8 @@ void __init default_setup_apic_routing(void)
 		}
 	}
 
-	if (is_vsmp_box()) {
-		/* need to update phys_pkg_id */
-		apic->phys_pkg_id = apicid_phys_pkg_id;
-	}
+	if (x86_platform.apic_post_init)
+		x86_platform.apic_post_init();
 }
 
 /* Same for both flat and physical. */
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 8eeb55a551b4..59eea855f451 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -187,12 +187,25 @@ static void __init vsmp_cap_cpus(void)
 #endif
 }
 
+static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
+{
+	return hard_smp_processor_id() >> index_msb;
+}
+
+static void vsmp_apic_post_init(void)
+{
+	/* need to update phys_pkg_id */
+	apic->phys_pkg_id = apicid_phys_pkg_id;
+}
+
 void __init vsmp_init(void)
 {
 	detect_vsmp_box();
 	if (!is_vsmp_box())
 		return;
 
+	x86_platform.apic_post_init = vsmp_apic_post_init;
+
 	vsmp_cap_cpus();
 
 	set_vsmp_pv_ops();