[PATCH] Summit: APIC ID mapping

Adds a raw_phys_apicid array that maps from the mps cpu number
to the apicid - this is needed because the apicids for Summit can be
larger than 32, and thus won't fit into the bitmap. Also adds little wrappers
to map neatly between the two.

Bumps up MAX_APICS for Summit.

arch/i386/kernel/mpparse.c

@@ -71,6 +71,7 @@ static unsigned int __initdata num_processors;
 unsigned long phys_cpu_present_map;
 
 int summit_x86 = 0;
+u8 raw_phys_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
 
 /*
  * Intel MP BIOS table parsing routines:
@@ -192,7 +193,7 @@ void __init MP_processor_info (struct mpc_config_processor *m)
 	if (clustered_apic_mode) {
 		phys_cpu_present_map |= (logical_apicid&0xf) << (4*quad);
 	} else {
-		phys_cpu_present_map |= 1 << m->mpc_apicid;
+		phys_cpu_present_map |= apicid_to_cpu_present(m->mpc_apicid);
 	}
 	/*
 	 * Validate version
@@ -202,6 +203,7 @@ void __init MP_processor_info (struct mpc_config_processor *m)
 		ver = 0x10;
 	}
 	apic_version[m->mpc_apicid] = ver;
+	raw_phys_apicid[num_processors - 1] = m->mpc_apicid;
 }
 
 static void __init MP_bus_info (struct mpc_config_bus *m)

arch/i386/kernel/smpboot.c

@@ -51,6 +51,7 @@
 #include <asm/desc.h>
 #include <asm/arch_hooks.h>
 #include "smpboot_hooks.h"
+#include "mach_apic.h"
 
 /* Set if we find a B stepping CPU */
 static int __initdata smp_b_stepping;

arch/i386/mach-generic/mach_apic.h

@@ -30,4 +30,17 @@ static inline void clustered_apic_check(void)
 		(clustered_apic_mode ? "NUMA-Q" : "Flat"), nr_ioapics);
 }
 
+static inline int cpu_present_to_apicid(int mps_cpu)
+{
+	if (clustered_apic_mode)
+		return ( ((mps_cpu/4)*16) + (1<<(mps_cpu%4)) );
+	else
+		return mps_cpu;
+}
+
+static inline unsigned long apicid_to_cpu_present(int apicid)
+{
+	return (1ul << apicid);
+}
+
 #endif /* __ASM_MACH_APIC_H */

arch/i386/mach-summit/mach_apic.h

@@ -38,4 +38,20 @@ static inline void clustered_apic_check(void)
 		(x86_summit ? "Summit" : "Flat"), nr_ioapics);
 }
 
+static inline int cpu_present_to_apicid(int mps_cpu)
+{
+	if (x86_summit)
+		return (int) raw_phys_apicid[mps_cpu];
+	else
+		return mps_cpu;
+}
+
+static inline unsigned long apicid_to_phys_cpu_present(int apicid)
+{
+	if (x86_summit)
+		return (1ul << (((apicid >> 4) << 2) | (apicid & 0x3)));
+	else
+		return (1ul << apicid);
+}
+
 #endif /* __ASM_MACH_APIC_H */

include/asm-i386/mpspec.h

@@ -16,11 +16,11 @@
 /*
  * a maximum of 16 APICs with the current APIC ID architecture.
  */
-#ifdef CONFIG_X86_NUMAQ
+#ifdef CONFIG_X86_NUMA
 #define MAX_APICS 256
-#else /* !CONFIG_X86_NUMAQ */
+#else /* !CONFIG_X86_NUMA */
 #define MAX_APICS 16
-#endif /* CONFIG_X86_NUMAQ */
+#endif /* CONFIG_X86_NUMA */
 
 #define MAX_MPC_ENTRY 1024
 

include/asm-i386/smp.h

@@ -65,6 +65,7 @@ extern void zap_low_mappings (void);
  * the real APIC ID <-> CPU # mapping.
  */
 #define MAX_APICID 256
+#define BAD_APICID 0xFFu
 extern volatile int cpu_to_physical_apicid[NR_CPUS];
 extern volatile int physical_apicid_to_cpu[MAX_APICID];
 extern volatile int cpu_to_logical_apicid[NR_CPUS];

include/asm-i386/smpboot.h

@@ -23,15 +23,6 @@
  #define boot_cpu_apicid boot_cpu_physical_apicid
 #endif /* CONFIG_CLUSTERED_APIC */
 
-/*
- * How to map from the cpu_present_map
- */
-#ifdef CONFIG_CLUSTERED_APIC
- #define cpu_present_to_apicid(mps_cpu) ( ((mps_cpu/4)*16) + (1<<(mps_cpu%4)) )
-#else /* !CONFIG_CLUSTERED_APIC */
- #define cpu_present_to_apicid(apicid) (apicid)
-#endif /* CONFIG_CLUSTERED_APIC */
-
 /*
  * Mappings between logical cpu number and logical / physical apicid
  * The first four macros are trivial, but it keeps the abstraction consistent