[PATCH] ppc64: Add NUMA cpu summary at boot

We used to print a NUMA cpu summary at boot before the hotplug cpu code
was added. This has been useful for catching machine configuration as
well as firmware bugs in the past.

This patch restores that functionality. An example of the output is:

Node 0 CPUs: 0-7
Node 1 CPUs: 8-15

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 8e3ca67..d381ec9 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -31,6 +31,7 @@
 #include <linux/sysdev.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
+#include <linux/topology.h>
 
 #include <asm/ptrace.h>
 #include <asm/atomic.h>
@@ -568,6 +569,8 @@ void __init smp_cpus_done(unsigned int max_cpus)
        smp_ops->setup_cpu(boot_cpuid);
 
        set_cpus_allowed(current, old_mask);
+
+       dump_numa_cpu_topology();
 }
 
 #ifdef CONFIG_HOTPLUG_CPU

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 97e83f1..fc519cd 100644 (file)
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -489,7 +489,41 @@ static void __init setup_nonnuma(void)
        node_set_online(0);
 }
 
-static void __init dump_numa_topology(void)
+void __init dump_numa_cpu_topology(void)
+{
+       unsigned int node;
+       unsigned int cpu, count;
+
+       if (min_common_depth == -1 || !numa_enabled)
+               return;
+
+       for_each_online_node(node) {
+               printk(KERN_INFO "Node %d CPUs:", node);
+
+               count = 0;
+               /*
+                * If we used a CPU iterator here we would miss printing
+                * the holes in the cpumap.
+                */
+               for (cpu = 0; cpu < NR_CPUS; cpu++) {
+                       if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
+                               if (count == 0)
+                                       printk(" %u", cpu);
+                               ++count;
+                       } else {
+                               if (count > 1)
+                                       printk("-%u", cpu - 1);
+                               count = 0;
+                       }
+               }
+
+               if (count > 1)
+                       printk("-%u", NR_CPUS - 1);
+               printk("\n");
+       }
+}
+
+static void __init dump_numa_memory_topology(void)
 {
        unsigned int node;
        unsigned int count;
@@ -521,7 +555,6 @@ static void __init dump_numa_topology(void)
                        printk("-0x%lx", i);
                printk("\n");
        }
-       return;
 }
 
 /*
@@ -583,7 +616,7 @@ void __init do_init_bootmem(void)
        if (parse_numa_properties())
                setup_nonnuma();
        else
-               dump_numa_topology();
+               dump_numa_memory_topology();
 
        register_cpu_notifier(&ppc64_numa_nb);
 

diff --git a/include/asm-powerpc/topology.h b/include/asm-powerpc/topology.h
index db8095c..f8a130a 100644 (file)
--- a/include/asm-powerpc/topology.h
+++ b/include/asm-powerpc/topology.h
@@ -55,8 +55,12 @@ static inline int node_to_first_cpu(int node)
        .nr_balance_failed      = 0,                    \
 }
 
+extern void __init dump_numa_cpu_topology(void);
+
 #else
 
+static inline void dump_numa_cpu_topology(void) {}
+
 #include <asm-generic/topology.h>
 
 #endif /* CONFIG_NUMA */