[SPARC64]: Proper multi-core scheduling support.

The scheduling domain hierarchy is:

   all cpus -->
      cpus that share an instruction cache -->
          cpus that share an integer execution unit

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 77 insertions, 1 deletions

diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index bd00f89eed1e..89a1b469b93d 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -396,6 +396,15 @@ config SCHED_SMT
           when dealing with UltraSPARC cpus at a cost of slightly increased
           overhead in some places. If unsure say N here.
 
+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.
+
 source "kernel/Kconfig.preempt"
 
 config CMDLINE_BOOL
diff --git a/arch/sparc64/kernel/mdesc.c b/arch/sparc64/kernel/mdesc.c
index 9246c2cf9574..1b5db4bc6b34 100644
--- a/arch/sparc64/kernel/mdesc.c
+++ b/arch/sparc64/kernel/mdesc.c
@@ -473,6 +473,53 @@ static void __init set_core_ids(void)
         }
 }
 
+static void __init mark_proc_ids(struct mdesc_node *mp, int proc_id)
+{
+        int i;
+
+        for (i = 0; i < mp->num_arcs; i++) {
+                struct mdesc_node *t = mp->arcs[i].arc;
+                const u64 *id;
+
+                if (strcmp(mp->arcs[i].name, "back"))
+                        continue;
+
+                if (strcmp(t->name, "cpu"))
+                        continue;
+
+                id = md_get_property(t, "id", NULL);
+                if (*id < NR_CPUS)
+                        cpu_data(*id).proc_id = proc_id;
+        }
+}
+
+static void __init __set_proc_ids(const char *exec_unit_name)
+{
+        struct mdesc_node *mp;
+        int idx;
+
+        idx = 0;
+        md_for_each_node_by_name(mp, exec_unit_name) {
+                const char *type;
+                int len;
+
+                type = md_get_property(mp, "type", &len);
+                if (!find_in_proplist(type, "int", len) &&
+                    !find_in_proplist(type, "integer", len))
+                        continue;
+
+                mark_proc_ids(mp, idx);
+
+                idx++;
+        }
+}
+
+static void __init set_proc_ids(void)
+{
+        __set_proc_ids("exec_unit");
+        __set_proc_ids("exec-unit");
+}
+
 static void __init get_one_mondo_bits(const u64 *p, unsigned int *mask, unsigned char def)
 {
         u64 val;
@@ -574,9 +621,11 @@ static void __init mdesc_fill_in_cpu_data(void)
 #endif
 
                 c->core_id = 0;
+                c->proc_id = -1;
         }
 
         set_core_ids();
+        set_proc_ids();
 
         smp_fill_in_sib_core_maps();
 }
diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
index dad4b3ba705f..928aba3d0db3 100644
--- a/arch/sparc64/kernel/prom.c
+++ b/arch/sparc64/kernel/prom.c
@@ -1800,6 +1800,7 @@ static void __init of_fill_in_cpu_data(void)
 
                         cpu_data(cpuid).core_id = 0;
                 }
+                cpu_data(cpuid).proc_id = -1;
 
 #ifdef CONFIG_SMP
                 cpu_set(cpuid, cpu_present_map);
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index c550bba3490a..68a45ac93375 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -51,6 +51,8 @@ cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
 cpumask_t phys_cpu_present_map __read_mostly = CPU_MASK_NONE;
 cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly =
         { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
+cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
+        { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
 static cpumask_t smp_commenced_mask;
 static cpumask_t cpu_callout_map;
 
@@ -1217,13 +1219,28 @@ void __devinit smp_fill_in_sib_core_maps(void)
                 unsigned int j;
 
                 if (cpu_data(i).core_id == 0) {
-                        cpu_set(i, cpu_sibling_map[i]);
+                        cpu_set(i, cpu_core_map[i]);
                         continue;
                 }
 
                 for_each_possible_cpu(j) {
                         if (cpu_data(i).core_id ==
                             cpu_data(j).core_id)
+                                cpu_set(j, cpu_core_map[i]);
+                }
+        }
+
+        for_each_possible_cpu(i) {
+                unsigned int j;
+
+                if (cpu_data(i).proc_id == -1) {
+                        cpu_set(i, cpu_sibling_map[i]);
+                        continue;
+                }
+
+                for_each_possible_cpu(j) {
+                        if (cpu_data(i).proc_id ==
+                            cpu_data(j).proc_id)
                                 cpu_set(j, cpu_sibling_map[i]);
                 }
         }