[PATCH] x86_64: Fix numa node topology detection for srat based x86_64 boxes

[~andy/linux] / arch / x86_64 / kernel / setup.c

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 351d8d64c2fbf45cff433c18fe38cba1156f2b7f..cb28df14ff6fea87991daba07241b86835db30ee 100644 (file)
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -836,6 +836,23 @@ static int __init init_amd(struct cpuinfo_x86 *c)
        int r;
        int level;
 
+#ifdef CONFIG_SMP
+       unsigned long value;
+
+       /*
+        * Disable TLB flush filter by setting HWCR.FFDIS on K8
+        * bit 6 of msr C001_0015
+        *
+        * Errata 63 for SH-B3 steppings
+        * Errata 122 for all steppings (F+ have it disabled by default)
+        */
+       if (c->x86 == 15) {
+               rdmsrl(MSR_K8_HWCR, value);
+               value |= 1 << 6;
+               wrmsrl(MSR_K8_HWCR, value);
+       }
+#endif
+
        /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
           3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
        clear_bit(0*32+31, &c->x86_capability);
@@ -950,13 +967,12 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 static void srat_detect_node(void)
 {
 #ifdef CONFIG_NUMA
-       unsigned apicid, node;
+       unsigned node;
        int cpu = smp_processor_id();
 
        /* Don't do the funky fallback heuristics the AMD version employs
           for now. */
-       apicid = phys_proc_id[cpu];
-       node = apicid_to_node[apicid];
+       node = apicid_to_node[hard_smp_processor_id()];
        if (node == NUMA_NO_NODE)
                node = 0;
        cpu_to_node[cpu] = node;