x86: introduce initial apicid

store initial_apicid from early identify. it is could be different from
phys_proc_id later.

also print it out in /proc/cpuinfo.

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

4 files changed, 16 insertions, 12 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 57a46c36fa23..0dd87b8d6707 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -369,10 +369,12 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
                         if (c->x86 >= 0x6)
                                 c->x86_model += ((tfms >> 16) & 0xF) << 4;
                         c->x86_mask = tfms & 15;
+                        c->initial_apicid = (ebx >> 24) & 0xFF;
 #ifdef CONFIG_X86_HT
-                        c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0);
+                        c->apicid = phys_pkg_id(c->initial_apicid, 0);
+                        c->phys_proc_id = c->initial_apicid;
 #else
-                        c->apicid = (ebx >> 24) & 0xFF;
+                        c->apicid = c->initial_apicid;
 #endif
                         if (test_cpu_cap(c, X86_FEATURE_CLFLSH))
                                 c->x86_clflush_size = ((ebx >> 8) & 0xff) * 8;
@@ -395,9 +397,6 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
                 init_scattered_cpuid_features(c);
         }
 
-#ifdef CONFIG_X86_HT
-        c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
-#endif
 }
 
 static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
@@ -554,7 +553,7 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
                 }
 
                 index_msb = get_count_order(smp_num_siblings);
-                c->phys_proc_id = phys_pkg_id((ebx >> 24) & 0xFF, index_msb);
+                c->phys_proc_id = phys_pkg_id(c->initial_apicid, index_msb);
 
                 printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
                        c->phys_proc_id);
@@ -565,7 +564,7 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
 
                 core_bits = get_count_order(c->x86_max_cores);
 
-                c->cpu_core_id = phys_pkg_id((ebx >> 24) & 0xFF, index_msb) &
+                c->cpu_core_id = phys_pkg_id(c->initial_apicid, index_msb) &
                                                ((1 << core_bits) - 1);
 
                 if (c->x86_max_cores > 1)
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index e8e58c09625d..0978a4a39418 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -19,6 +19,8 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
                            cpus_weight(per_cpu(cpu_core_map, cpu)));
                 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
                 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
+                seq_printf(m, "apicid\t\t: %d\n", c->apicid);
+                seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
         }
 #endif
 }
@@ -60,6 +62,7 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
                 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
                 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
                 seq_printf(m, "apicid\t\t: %d\n", c->apicid);
+                seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
         }
 #endif
 }
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index f303c70dd688..13fe525bf065 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -562,9 +562,9 @@ static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
         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);
-        /* Convert the APIC ID into the socket ID */
-        c->phys_proc_id = (c->apicid - boot_cpu_id) >> bits;
+        c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
+        /* Convert the initial APIC ID into the socket ID */
+        c->phys_proc_id = c->initial_apicid >> bits;
 
 #ifdef CONFIG_NUMA
         node = c->phys_proc_id;
@@ -581,7 +581,7 @@ static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
                    If that doesn't result in a usable node fall back to the
                    path for the previous case.  */
 
-                int ht_nodeid = apicid - boot_cpu_id;
+                int ht_nodeid = c->initial_apicid;
 
                 if (ht_nodeid >= 0 &&
                     apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
@@ -936,8 +936,9 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
                 c->x86 = 4;
         }
 
+        c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
 #ifdef CONFIG_SMP
-        c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
+        c->phys_proc_id = c->initial_apicid;
 #endif
         /* AMD-defined flags: level 0x80000001 */
         xlvl = cpuid_eax(0x80000000);
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index 1f9501a38493..d590da88c0df 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -101,6 +101,7 @@ struct cpuinfo_x86 {
         /* cpuid returned max cores value: */
         u16                      x86_max_cores;
         u16                     apicid;
+        u16                     initial_apicid;
         u16                     x86_clflush_size;
 #ifdef CONFIG_SMP
         /* number of cores as seen by the OS: */