sparc64: Refactor OBP cpu scanning code using an iterator.

With feedback from Sam Ravnborg.

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

1 files changed, 124 insertions, 109 deletions

diff --git a/arch/sparc/kernel/prom_64.c b/arch/sparc/kernel/prom_64.c
index ca55c7012f77..4d92f488fae1 100644
--- a/arch/sparc/kernel/prom_64.c
+++ b/arch/sparc/kernel/prom_64.c
@@ -374,75 +374,26 @@ static const char *get_mid_prop(void)
         return (tlb_type == spitfire ? "upa-portid" : "portid");
 }
 
-struct device_node *of_find_node_by_cpuid(int cpuid)
-{
-        struct device_node *dp;
-        const char *mid_prop = get_mid_prop();
-
-        for_each_node_by_type(dp, "cpu") {
-                int id = of_getintprop_default(dp, mid_prop, -1);
-                const char *this_mid_prop = mid_prop;
-
-                if (id < 0) {
-                        this_mid_prop = "cpuid";
-                        id = of_getintprop_default(dp, this_mid_prop, -1);
-                }
-
-                if (id < 0) {
-                        prom_printf("OF: Serious problem, cpu lacks "
-                                    "%s property", this_mid_prop);
-                        prom_halt();
-                }
-                if (cpuid == id)
-                        return dp;
-        }
-        return NULL;
-}
-
-void __init of_fill_in_cpu_data(void)
+static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
 {
         struct device_node *dp;
         const char *mid_prop;
 
-        if (tlb_type == hypervisor)
-                return;
-
         mid_prop = get_mid_prop();
-        ncpus_probed = 0;
         for_each_node_by_type(dp, "cpu") {
                 int cpuid = of_getintprop_default(dp, mid_prop, -1);
                 const char *this_mid_prop = mid_prop;
-                struct device_node *portid_parent;
-                int portid = -1;
+                void *ret;
 
-                portid_parent = NULL;
                 if (cpuid < 0) {
                         this_mid_prop = "cpuid";
                         cpuid = of_getintprop_default(dp, this_mid_prop, -1);
-                        if (cpuid >= 0) {
-                                int limit = 2;
-
-                                portid_parent = dp;
-                                while (limit--) {
-                                        portid_parent = portid_parent->parent;
-                                        if (!portid_parent)
-                                                break;
-                                        portid = of_getintprop_default(portid_parent,
-                                                                       "portid", -1);
-                                        if (portid >= 0)
-                                                break;
-                                }
-                        }
                 }
-
                 if (cpuid < 0) {
                         prom_printf("OF: Serious problem, cpu lacks "
                                     "%s property", this_mid_prop);
                         prom_halt();
                 }
-
-                ncpus_probed++;
-
 #ifdef CONFIG_SMP
                 if (cpuid >= NR_CPUS) {
                         printk(KERN_WARNING "Ignoring CPU %d which is "
@@ -450,79 +401,143 @@ void __init of_fill_in_cpu_data(void)
                                cpuid, NR_CPUS);
                         continue;
                 }
-#else
-                /* On uniprocessor we only want the values for the
-                 * real physical cpu the kernel booted onto, however
-                 * cpu_data() only has one entry at index 0.
-                 */
-                if (cpuid != real_hard_smp_processor_id())
-                        continue;
-                cpuid = 0;
 #endif
+                ret = func(dp, cpuid, arg);
+                if (ret)
+                        return ret;
+        }
+        return NULL;
+}
 
-                cpu_data(cpuid).clock_tick =
-                        of_getintprop_default(dp, "clock-frequency", 0);
-
-                if (portid_parent) {
-                        cpu_data(cpuid).dcache_size =
-                                of_getintprop_default(dp, "l1-dcache-size",
-                                                      16 * 1024);
-                        cpu_data(cpuid).dcache_line_size =
-                                of_getintprop_default(dp, "l1-dcache-line-size",
-                                                      32);
-                        cpu_data(cpuid).icache_size =
-                                of_getintprop_default(dp, "l1-icache-size",
-                                                      8 * 1024);
-                        cpu_data(cpuid).icache_line_size =
-                                of_getintprop_default(dp, "l1-icache-line-size",
-                                                      32);
-                        cpu_data(cpuid).ecache_size =
-                                of_getintprop_default(dp, "l2-cache-size", 0);
-                        cpu_data(cpuid).ecache_line_size =
-                                of_getintprop_default(dp, "l2-cache-line-size", 0);
-                        if (!cpu_data(cpuid).ecache_size ||
-                            !cpu_data(cpuid).ecache_line_size) {
-                                cpu_data(cpuid).ecache_size =
-                                        of_getintprop_default(portid_parent,
-                                                              "l2-cache-size",
-                                                              (4 * 1024 * 1024));
-                                cpu_data(cpuid).ecache_line_size =
-                                        of_getintprop_default(portid_parent,
-                                                              "l2-cache-line-size", 64);
-                        }
-
-                        cpu_data(cpuid).core_id = portid + 1;
-                        cpu_data(cpuid).proc_id = portid;
+static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
+{
+        if (id == cpuid)
+                return dp;
+        return NULL;
+}
+
+struct device_node *of_find_node_by_cpuid(int cpuid)
+{
+        return of_iterate_over_cpus(check_cpu_node, cpuid);
+}
+
+static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
+{
+        ncpus_probed++;
 #ifdef CONFIG_SMP
-                        sparc64_multi_core = 1;
+        set_cpu_present(cpuid, true);
+        set_cpu_possible(cpuid, true);
 #endif
-                } else {
-                        cpu_data(cpuid).dcache_size =
-                                of_getintprop_default(dp, "dcache-size", 16 * 1024);
-                        cpu_data(cpuid).dcache_line_size =
-                                of_getintprop_default(dp, "dcache-line-size", 32);
+        return NULL;
+}
 
-                        cpu_data(cpuid).icache_size =
-                                of_getintprop_default(dp, "icache-size", 16 * 1024);
-                        cpu_data(cpuid).icache_line_size =
-                                of_getintprop_default(dp, "icache-line-size", 32);
+void __init of_populate_present_mask(void)
+{
+        if (tlb_type == hypervisor)
+                return;
+
+        ncpus_probed = 0;
+        of_iterate_over_cpus(record_one_cpu, 0);
+}
 
+static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
+{
+        struct device_node *portid_parent = NULL;
+        int portid = -1;
+
+        if (of_find_property(dp, "cpuid", NULL)) {
+                int limit = 2;
+
+                portid_parent = dp;
+                while (limit--) {
+                        portid_parent = portid_parent->parent;
+                        if (!portid_parent)
+                                break;
+                        portid = of_getintprop_default(portid_parent,
+                                                       "portid", -1);
+                        if (portid >= 0)
+                                break;
+                }
+        }
+
+#ifndef CONFIG_SMP
+        /* On uniprocessor we only want the values for the
+         * real physical cpu the kernel booted onto, however
+         * cpu_data() only has one entry at index 0.
+         */
+        if (cpuid != real_hard_smp_processor_id())
+                return NULL;
+        cpuid = 0;
+#endif
+
+        cpu_data(cpuid).clock_tick =
+                of_getintprop_default(dp, "clock-frequency", 0);
+
+        if (portid_parent) {
+                cpu_data(cpuid).dcache_size =
+                        of_getintprop_default(dp, "l1-dcache-size",
+                                              16 * 1024);
+                cpu_data(cpuid).dcache_line_size =
+                        of_getintprop_default(dp, "l1-dcache-line-size",
+                                              32);
+                cpu_data(cpuid).icache_size =
+                        of_getintprop_default(dp, "l1-icache-size",
+                                              8 * 1024);
+                cpu_data(cpuid).icache_line_size =
+                        of_getintprop_default(dp, "l1-icache-line-size",
+                                              32);
+                cpu_data(cpuid).ecache_size =
+                        of_getintprop_default(dp, "l2-cache-size", 0);
+                cpu_data(cpuid).ecache_line_size =
+                        of_getintprop_default(dp, "l2-cache-line-size", 0);
+                if (!cpu_data(cpuid).ecache_size ||
+                    !cpu_data(cpuid).ecache_line_size) {
                         cpu_data(cpuid).ecache_size =
-                                of_getintprop_default(dp, "ecache-size",
+                                of_getintprop_default(portid_parent,
+                                                      "l2-cache-size",
                                                       (4 * 1024 * 1024));
                         cpu_data(cpuid).ecache_line_size =
-                                of_getintprop_default(dp, "ecache-line-size", 64);
-
-                        cpu_data(cpuid).core_id = 0;
-                        cpu_data(cpuid).proc_id = -1;
+                                of_getintprop_default(portid_parent,
+                                                      "l2-cache-line-size", 64);
                 }
 
+                cpu_data(cpuid).core_id = portid + 1;
+                cpu_data(cpuid).proc_id = portid;
 #ifdef CONFIG_SMP
-                set_cpu_present(cpuid, true);
-                set_cpu_possible(cpuid, true);
+                sparc64_multi_core = 1;
 #endif
+        } else {
+                cpu_data(cpuid).dcache_size =
+                        of_getintprop_default(dp, "dcache-size", 16 * 1024);
+                cpu_data(cpuid).dcache_line_size =
+                        of_getintprop_default(dp, "dcache-line-size", 32);
+
+                cpu_data(cpuid).icache_size =
+                        of_getintprop_default(dp, "icache-size", 16 * 1024);
+                cpu_data(cpuid).icache_line_size =
+                        of_getintprop_default(dp, "icache-line-size", 32);
+
+                cpu_data(cpuid).ecache_size =
+                        of_getintprop_default(dp, "ecache-size",
+                                              (4 * 1024 * 1024));
+                cpu_data(cpuid).ecache_line_size =
+                        of_getintprop_default(dp, "ecache-line-size", 64);
+
+                cpu_data(cpuid).core_id = 0;
+                cpu_data(cpuid).proc_id = -1;
         }
 
+        return NULL;
+}
+
+void __init of_fill_in_cpu_data(void)
+{
+        if (tlb_type == hypervisor)
+                return;
+
+        of_populate_present_mask();
+        of_iterate_over_cpus(fill_in_one_cpu, 0);
+
         smp_fill_in_sib_core_maps();
 }