x86/cpu/AMD: Evaluate smp_num_siblings early

commit 1e1d7e25fd759eddf96d8ab39d0a90a1979b2d8c upstream

To support force disabling of SMT it's required to know the number of
thread siblings early. amd_get_topology() cannot be called before the APIC
driver is selected, so split out the part which initializes
smp_num_siblings and invoke it from amd_early_init().

[dwmw2: Backport to 4.9]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index e9b613a..fa2bdf5 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -296,13 +296,24 @@ static int nearby_node(int apicid)
 }
 #endif
 
+#ifdef CONFIG_SMP
+
+static void amd_get_topology_early(struct cpuinfo_x86 *c)
+{
+       if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
+               u32 eax, ebx, ecx, edx;
+
+               cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
+               smp_num_siblings = ((ebx >> 8) & 0xff) + 1;
+       }
+}
+
 /*
  * Fixup core topology information for
  * (1) AMD multi-node processors
  *     Assumption: Number of cores in each internal node is the same.
  * (2) AMD processors supporting compute units
  */
-#ifdef CONFIG_SMP
 static void amd_get_topology(struct cpuinfo_x86 *c)
 {
        u8 node_id;
@@ -633,6 +644,8 @@ static void early_init_amd(struct cpuinfo_x86 *c)
         */
        if (cpu_has_amd_erratum(c, amd_erratum_400))
                set_cpu_bug(c, X86_BUG_AMD_E400);
+
+       amd_get_topology_early(c);
 }
 
 static void init_amd_k8(struct cpuinfo_x86 *c)