[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>

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

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();
 }

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);

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]);
 		}
 	}

include/asm-sparc64/cpudata.h

@@ -31,7 +31,7 @@ typedef struct {
 	unsigned int	ecache_size;
 	unsigned int	ecache_line_size;
 	int		core_id;
-	unsigned int	__pad3;
+	int		proc_id;
 } cpuinfo_sparc;
 
 DECLARE_PER_CPU(cpuinfo_sparc, __cpu_data);

include/asm-sparc64/smp.h

@@ -33,6 +33,7 @@ extern cpumask_t phys_cpu_present_map;
 #define cpu_possible_map phys_cpu_present_map
 
 extern cpumask_t cpu_sibling_map[NR_CPUS];
+extern cpumask_t cpu_core_map[NR_CPUS];
 
 /*
  *	General functions that each host system must provide.

include/asm-sparc64/topology.h

 #ifndef _ASM_SPARC64_TOPOLOGY_H
 #define _ASM_SPARC64_TOPOLOGY_H
 
+#ifdef CONFIG_SMP
 #include <asm/spitfire.h>
-#define smt_capable()	(tlb_type == hypervisor)
-
-#include <asm-generic/topology.h>
 
+#define topology_physical_package_id(cpu)	(cpu_data(cpu).proc_id)
 #define topology_core_id(cpu)			(cpu_data(cpu).core_id)
+#define topology_core_siblings(cpu)		(cpu_core_map[cpu])
 #define topology_thread_siblings(cpu)		(cpu_sibling_map[cpu])
+#define mc_capable()				(tlb_type == hypervisor)
+#define smt_capable()				(tlb_type == hypervisor)
+#endif /* CONFIG_SMP */
+
+#include <asm-generic/topology.h>
+
+#define cpu_coregroup_map(cpu)			(cpu_core_map[cpu])
 
 #endif /* _ASM_SPARC64_TOPOLOGY_H */