[XEN RFC PATCH 26/40] xen/arm: Add boot and secondary CPU to NUMA system

[Wei Chen <wei.chen@xxxxxxx>]

When cpu boot up, we have add them to NUMA system. In current
stage, we have not parsed the NUMA data, but we have created
a fake NUMA node. So, in this patch, all CPU will be added
to NUMA node#0. After the NUMA data has been parsed from device
tree, the CPU will be added to correct NUMA node as the NUMA
data described.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
 xen/arch/arm/setup.c       | 6 ++++++
 xen/arch/arm/smpboot.c     | 6 ++++++
 xen/include/asm-arm/numa.h | 1 +
 3 files changed, 13 insertions(+)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 3c58d2d441..7531989f21 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -918,6 +918,12 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     processor_id();
 
+    /*
+     * If Xen is running on a NUMA off system, there will
+     * be a node#0 at least.
+     */
+    numa_add_cpu(0);
+
     smp_init_cpus();
     cpus = smp_get_max_cpus();
     printk(XENLOG_INFO "SMP: Allowing %u CPUs\n", cpus);
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index a1ee3146ef..aa78958c07 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -358,6 +358,12 @@ void start_secondary(void)
      */
     smp_wmb();
 
+    /*
+     * If Xen is running on a NUMA off system, there will
+     * be a node#0 at least.
+     */
+    numa_add_cpu(cpuid);
+
     /* Now report this CPU is up */
     cpumask_set_cpu(cpuid, &cpu_online_map);
 
diff --git a/xen/include/asm-arm/numa.h b/xen/include/asm-arm/numa.h
index 7a3588ac7f..dd31324b0b 100644
--- a/xen/include/asm-arm/numa.h
+++ b/xen/include/asm-arm/numa.h
@@ -59,6 +59,7 @@ extern mfn_t first_valid_mfn;
 #define __node_distance(a, b) (20)
 
 #define numa_init(x) do { } while (0)
+#define numa_add_cpu(x) do { } while (0)
 #define numa_set_node(x, y) do { } while (0)
 
 #endif
-- 
2.25.1