summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPaul Mundt <lethal@linux-sh.org>2009-10-16 18:00:02 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-10-16 18:00:02 +0900
commit896f0c0e8e4ee02ee72a203aef79f362d5f7b7cc (patch)
tree0ee60b7c1d2d018bf9789b277942489929108ac7
parent9dbe00a56a60748668d2040cf4e59427060e2252 (diff)
sh: Support SCHED_MC for SH-X3 multi-cores.
This enables SCHED_MC support for SH-X3 multi-cores. Presently this is just a simple wrapper around the possible map, but this allows for tying in support for some of the more exotic NUMA clusters where we can actually do something with the topology. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--arch/sh/include/asm/topology.h8
-rw-r--r--arch/sh/kernel/topology.c26
-rw-r--r--arch/sh/mm/Kconfig9
3 files changed, 43 insertions, 0 deletions
diff --git a/arch/sh/include/asm/topology.h b/arch/sh/include/asm/topology.h
index 65e7bd2f2240..37cdadd975ac 100644
--- a/arch/sh/include/asm/topology.h
+++ b/arch/sh/include/asm/topology.h
@@ -40,6 +40,14 @@
#endif
+#define mc_capable() (1)
+
+const struct cpumask *cpu_coregroup_mask(unsigned int cpu);
+
+extern cpumask_t cpu_core_map[NR_CPUS];
+
+#define topology_core_cpumask(cpu) (&cpu_core_map[cpu])
+
#include <asm-generic/topology.h>
#endif /* _ASM_SH_TOPOLOGY_H */
diff --git a/arch/sh/kernel/topology.c b/arch/sh/kernel/topology.c
index 0838942b7083..9b0b633b6c92 100644
--- a/arch/sh/kernel/topology.c
+++ b/arch/sh/kernel/topology.c
@@ -16,6 +16,32 @@
static DEFINE_PER_CPU(struct cpu, cpu_devices);
+cpumask_t cpu_core_map[NR_CPUS];
+
+static cpumask_t cpu_coregroup_map(unsigned int cpu)
+{
+ /*
+ * Presently all SH-X3 SMP cores are multi-cores, so just keep it
+ * simple until we have a method for determining topology..
+ */
+ return cpu_possible_map;
+}
+
+const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
+{
+ return &cpu_core_map[cpu];
+}
+
+int arch_update_cpu_topology(void)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu)
+ cpu_core_map[cpu] = cpu_coregroup_map(cpu);
+
+ return 0;
+}
+
static int __init topology_init(void)
{
int i, ret;
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index b8a9032c74be..ca02b72bf46f 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -256,6 +256,15 @@ endchoice
source "mm/Kconfig"
+config SCHED_MC
+ bool "Multi-core scheduler support"
+ depends on SMP
+ default y
+ help
+ Multi-core scheduler support improves the CPU scheduler's decision
+ making when dealing with multi-core CPU chips at a cost of slightly
+ increased overhead in some places. If unsure say N here.
+
endmenu
menu "Cache configuration"