[Xen-devel] [RFC PATCH v1 09/21] ARM: NUMA: Add CPU NUMA support

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>

For each cpu, update cpu_to_node[] with node id from
the MPIDR registers. Also, initialize cpu_to_node[]
with node 0.

Add macros to access cpu_to_node[] information.

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>
---
 xen/arch/arm/numa.c        | 25 +++++++++++++++++++++++++
 xen/arch/arm/setup.c       |  2 ++
 xen/arch/arm/smpboot.c     |  3 +++
 xen/include/asm-arm/numa.h | 15 +++++++++++++++
 4 files changed, 45 insertions(+)

diff --git a/xen/arch/arm/numa.c b/xen/arch/arm/numa.c
index 11d100b..d4dbad4 100644
--- a/xen/arch/arm/numa.c
+++ b/xen/arch/arm/numa.c
@@ -23,9 +23,23 @@
 #include <xen/numa.h>
 #include <asm/acpi.h>
 #include <xen/errno.h>
+#include <xen/cpumask.h>
 
 int _node_distance[MAX_NUMNODES * 2];
 int *node_distance;
+extern nodemask_t numa_nodes_parsed;
+
+void __init numa_set_cpu_node(int cpu, unsigned long hwid)
+{
+    unsigned node;
+
+    node = hwid >> 16 & 0xf;
+    if ( !node_isset(node, numa_nodes_parsed) || node == MAX_NUMNODES )
+        node = 0;
+
+    numa_set_node(cpu, node);
+    numa_add_cpu(cpu);
+}
 
 u8 __node_distance(nodeid_t a, nodeid_t b)
 {
@@ -37,6 +51,17 @@ u8 __node_distance(nodeid_t a, nodeid_t b)
 
 EXPORT_SYMBOL(__node_distance);
 
+/*
+ * Setup early cpu_to_node.
+ */
+void __init init_cpu_to_node(void)
+{
+    int i;
+
+    for ( i = 0; i < nr_cpu_ids; i++ )
+        numa_set_node(i, 0);
+}
+
 int __init numa_init(void)
 {
     int i, ret = 0;
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index b6618ca..5612ba6 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -749,6 +749,8 @@ void __init start_xen(unsigned long boot_phys_offset,
            xen_paddr, xen_paddr + xen_bootmodule->size);
     xen_bootmodule->start = xen_paddr;
 
+    init_cpu_to_node();
+
     setup_mm(fdt_paddr, fdt_size);
 
     /* Parse the ACPI tables for possible boot-time configuration */
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index 32e8722..3667d4b 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -30,6 +30,7 @@
 #include <xen/irq.h>
 #include <xen/console.h>
 #include <asm/cpuerrata.h>
+#include <xen/numa.h>
 #include <asm/gic.h>
 #include <asm/psci.h>
 #include <asm/acpi.h>
@@ -313,6 +314,8 @@ void start_secondary(unsigned long boot_phys_offset,
      */
     smp_wmb();
 
+    numa_set_cpu_node(cpuid, hwid);
+
     /* 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 b8857e2..33a9e53 100644
--- a/xen/include/asm-arm/numa.h
+++ b/xen/include/asm-arm/numa.h
@@ -2,16 +2,26 @@
 #define __ARCH_ARM_NUMA_H
 
 #include <xen/errno.h>
+#include <xen/cpumask.h>
 
 typedef u8 nodeid_t;
 
 #define NODES_SHIFT 2
 
 #ifdef CONFIG_NUMA
+
+extern cpumask_t     node_to_cpumask[];
+extern nodeid_t      cpu_to_node[NR_CPUS];
+#define cpu_to_node(cpu)         (cpu_to_node[cpu])
+#define parent_node(node)        (node)
+#define node_to_first_cpu(node)  (__ffs(node_to_cpumask[node]))
+#define node_to_cpumask(node)    (node_to_cpumask[node])
+
 int arch_numa_setup(char *opt);
 int __init numa_init(void);
 int __init dt_numa_init(void);
 u8 __node_distance(nodeid_t a, nodeid_t b);
+void __init numa_set_cpu_node(int cpu, unsigned long hwid);
 #else
 static inline int arch_numa_setup(char *opt)
 {
@@ -28,6 +38,11 @@ static inline int __init dt_numa_init(void)
     return -EINVAL;
 }
 
+static inline void __init numa_set_cpu_node(int cpu, unsigned long hwid)
+{
+    return;
+}
+
 /* Fake one node for now. See also node_online_map. */
 #define cpu_to_node(cpu) 0
 #define node_to_cpumask(node)   (cpu_online_map)
-- 
2.7.4


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