x86: store core id bits in cpuinfo_x8

We need to store core id bits to cpuinfo_x86 in early_identify_cpu. So we
use it to create acpiid_to_node array in k8topolgy.c

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 47 insertions, 25 deletions

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 62db062ba138..84f66b7b4d2e 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -542,18 +542,7 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
         int node = 0;
         unsigned apicid = hard_smp_processor_id();
 #endif
-        unsigned ecx = cpuid_ecx(0x80000008);
-
-        c->x86_max_cores = (ecx & 0xff) + 1;
-
-        /* CPU telling us the core id bits shift? */
-        bits = (ecx >> 12) & 0xF;
-
-        /* Otherwise recompute */
-        if (bits == 0) {
-                while ((1 << bits) < c->x86_max_cores)
-                        bits++;
-        }
+        bits = c->x86_coreid_bits;
 
         /* Low order bits define the core id (index of core in socket) */
         c->cpu_core_id = c->phys_proc_id & ((1 << bits)-1);
@@ -591,6 +580,33 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 #endif
 }
 
+static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
+{
+#ifdef CONFIG_SMP
+        unsigned bits, ecx;
+
+        /* Multi core CPU? */
+        if (c->extended_cpuid_level < 0x80000008)
+                return;
+
+        ecx = cpuid_ecx(0x80000008);
+
+        c->x86_max_cores = (ecx & 0xff) + 1;
+
+        /* CPU telling us the core id bits shift? */
+        bits = (ecx >> 12) & 0xF;
+
+        /* Otherwise recompute */
+        if (bits == 0) {
+                while ((1 << bits) < c->x86_max_cores)
+                        bits++;
+        }
+
+        c->x86_coreid_bits = bits;
+
+#endif
+}
+
 #define ENABLE_C1E_MASK         0x18000000
 #define CPUID_PROCESSOR_SIGNATURE       1
 #define CPUID_XFAM              0x0ff00000
@@ -858,7 +874,7 @@ struct cpu_model_info {
    below. */
 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 {
-        u32 tfms;
+        u32 tfms, xlvl;
 
         c->loops_per_jiffy = loops_per_jiffy;
         c->x86_cache_size = -1;
@@ -869,6 +885,7 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
         c->x86_clflush_size = 64;
         c->x86_cache_alignment = c->x86_clflush_size;
         c->x86_max_cores = 1;
+        c->x86_coreid_bits = 0;
         c->extended_cpuid_level = 0;
         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 
@@ -905,18 +922,6 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 #ifdef CONFIG_SMP
         c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
 #endif
-}
-
-/*
- * This does the hard work of actually picking apart the CPU stuff...
- */
-void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
-{
-        int i;
-        u32 xlvl;
-
-        early_identify_cpu(c);
-
         /* AMD-defined flags: level 0x80000001 */
         xlvl = cpuid_eax(0x80000000);
         c->extended_cpuid_level = xlvl;
@@ -937,6 +942,23 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
                         c->x86_capability[2] = cpuid_edx(0x80860001);
         }
 
+        switch (c->x86_vendor) {
+        case X86_VENDOR_AMD:
+                early_init_amd(c);
+                break;
+        }
+
+}
+
+/*
+ * This does the hard work of actually picking apart the CPU stuff...
+ */
+void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
+{
+        int i;
+
+        early_identify_cpu(c);
+
         init_scattered_cpuid_features(c);
 
         c->apicid = phys_pkg_id(0);