x86: apic - generic_processor_info

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / kernel / apic_64.c

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 0d969103fce7dec50ade7251029b5f88ce652e1b..76c20773bedf0814473a6c35b8165571cc130ea1 100644 (file)
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1215,6 +1215,8 @@ void __init init_apic_mappings(void)
  * This initializes the IO-APIC and APIC hardware if this is
  * a UP kernel.
  */
+int apic_version[MAX_APICS];
+
 int __init APIC_init_uniprocessor(void)
 {
        if (disable_apic) {
@@ -1409,15 +1411,26 @@ void __cpuinit generic_processor_info(int apicid, int version)
        int cpu;
        cpumask_t tmp_map;
 
+       /*
+        * Validate version
+        */
+       if (version == 0x0) {
+               printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
+                               "fixing up to 0x10. (tell your hw vendor)\n",
+                               version);
+               version = 0x10;
+       }
+       apic_version[apicid] = version;
+
        if (num_processors >= NR_CPUS) {
                printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
-                      " Processor ignored.\n", NR_CPUS);
+                       "  Processor ignored.\n", NR_CPUS);
                return;
        }
 
        if (num_processors >= maxcpus) {
                printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
-                      " Processor ignored.\n", maxcpus);
+                       " Processor ignored.\n", maxcpus);
                return;
        }
 
@@ -1437,6 +1450,29 @@ void __cpuinit generic_processor_info(int apicid, int version)
        if (apicid > max_physical_apicid)
                max_physical_apicid = apicid;
 
+#ifdef CONFIG_X86_32
+       /*
+        * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
+        * but we need to work other dependencies like SMP_SUSPEND etc
+        * before this can be done without some confusion.
+        * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
+        *       - Ashok Raj <ashok.raj@intel.com>
+        */
+       if (max_physical_apicid >= 8) {
+               switch (boot_cpu_data.x86_vendor) {
+               case X86_VENDOR_INTEL:
+                       if (!APIC_XAPIC(version)) {
+                               def_to_bigsmp = 0;
+                               break;
+                       }
+                       /* If P4 and above fall through */
+               case X86_VENDOR_AMD:
+                       def_to_bigsmp = 1;
+               }
+       }
+#endif
+
+#if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
        /* are we being called early in kernel startup? */
        if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
                u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
@@ -1448,6 +1484,7 @@ void __cpuinit generic_processor_info(int apicid, int version)
                per_cpu(x86_cpu_to_apicid, cpu) = apicid;
                per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
        }
+#endif
 
        cpu_set(cpu, cpu_possible_map);
        cpu_set(cpu, cpu_present_map);