x86: introduce max_physical_apicid for bigsmp switching

a multi-socket test-system with 3 or 4 ioapics, when 4 dualcore cpus or
2 quadcore cpus installed, needs to switch to bigsmp or physflat.

CPU apic id is [4,11] instead of [0,7], and we need to check max apic
id instead of cpu numbers.

also add check for 32 bit when acpi is not compiled in or acpi=off.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

7 files changed, 20 insertions, 9 deletions

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index c304759f0834..954d67931a50 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1518,6 +1518,9 @@ void __cpuinit generic_processor_info(int apicid, int version)
                  */
                 cpu = 0;
 
+        if (apicid > max_physical_apicid)
+                max_physical_apicid = apicid;
+
         /*
          * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
          * but we need to work other dependencies like SMP_SUSPEND etc
@@ -1525,7 +1528,7 @@ void __cpuinit generic_processor_info(int apicid, int version)
          * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
          *       - Ashok Raj <ashok.raj@intel.com>
          */
-        if (num_processors > 8) {
+        if (max_physical_apicid >= 8) {
                 switch (boot_cpu_data.x86_vendor) {
                 case X86_VENDOR_INTEL:
                         if (!APIC_XAPIC(version)) {
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 54087f920f2f..1872555b98a3 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1093,6 +1093,9 @@ void __cpuinit generic_processor_info(int apicid, int version)
                  */
                 cpu = 0;
         }
+        if (apicid > max_physical_apicid)
+                max_physical_apicid = apicid;
+
         /* are we being called early in kernel startup? */
         if (x86_cpu_to_apicid_early_ptr) {
                 u16 *cpu_to_apicid = x86_cpu_to_apicid_early_ptr;
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
index cbaaf69bedb2..1fa8be5bd217 100644
--- a/arch/x86/kernel/genapic_64.c
+++ b/arch/x86/kernel/genapic_64.c
@@ -51,7 +51,7 @@ void __init setup_apic_routing(void)
         else
 #endif
 
-        if (num_possible_cpus() <= 8)
+        if (max_physical_apicid < 8)
                 genapic = &apic_flat;
         else
                 genapic = &apic_physflat;
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index b4a950da2f97..7591325e616d 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -473,6 +473,11 @@ static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
                 ++mpc_record;
 #endif
         }
+
+#ifdef CONFIG_X86_GENERICARCH
+       generic_bigsmp_probe();
+#endif
+
         setup_apic_routing();
         if (!num_processors)
                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0a281f2c7157..45a5e247d450 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -17,6 +17,7 @@ unsigned int num_processors;
 unsigned disabled_cpus __cpuinitdata;
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
+unsigned int max_physical_apicid;
 EXPORT_SYMBOL(boot_cpu_physical_apicid);
 
 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index ee1ccdbd7100..be1a99003677 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -838,18 +838,17 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_ACPI
         acpi_boot_init();
-
+#endif
+#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
+        if (smp_found_config)
+                get_smp_config();
+#endif
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
         if (def_to_bigsmp)
                 printk(KERN_WARNING "More than 8 CPUs detected and "
                         "CONFIG_X86_PC cannot handle it.\nUse "
                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 #endif
-#endif
-#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
-        if (smp_found_config)
-                get_smp_config();
-#endif
 
         e820_setup_gap();
         e820_mark_nosave_regions(max_low_pfn);
diff --git a/arch/x86/mach-generic/bigsmp.c b/arch/x86/mach-generic/bigsmp.c
index 95fc463056d0..2a243019acae 100644
--- a/arch/x86/mach-generic/bigsmp.c
+++ b/arch/x86/mach-generic/bigsmp.c
@@ -48,7 +48,7 @@ static const struct dmi_system_id bigsmp_dmi_table[] = {
 static int probe_bigsmp(void)
 {
         if (def_to_bigsmp)
-        dmi_bigsmp = 1;
+                dmi_bigsmp = 1;
         else
                 dmi_check_system(bigsmp_dmi_table);
         return dmi_bigsmp;