of: Make cpu node handling more portable.

Use for_each_node_by_type() to iterate all cpu nodes in the
system.

Provide and overridable function arch_find_n_match_cpu_physical_id,
which sees if the given device node matches 'cpu' and if so sets
'*thread' when non-NULL to the cpu thread number within the core.

The default implementation behaves the same as the existing code.

Add a sparc64 implementation.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

1 files changed, 28 insertions, 17 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 7d4c70f859e3..e4c99453adf1 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -280,6 +280,31 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
         return false;
 }
 
+/*
+ * arch_find_n_match_cpu_physical_id - See if the given device node is
+ * for the cpu corresponding to logical cpu 'cpu'.  Return true if so,
+ * else false.  If 'thread' is non-NULL, the local thread number within the
+ * core is returned in it.
+ */
+bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun,
+                                              int cpu, unsigned int *thread)
+{
+        /* Check for non-standard "ibm,ppc-interrupt-server#s" property
+         * for thread ids on PowerPC. If it doesn't exist fallback to
+         * standard "reg" property.
+         */
+        if (IS_ENABLED(CONFIG_PPC) &&
+            __of_find_n_match_cpu_property(cpun,
+                                           "ibm,ppc-interrupt-server#s",
+                                           cpu, thread))
+                return true;
+
+        if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread))
+                return true;
+
+        return false;
+}
+
 /**
  * of_get_cpu_node - Get device node associated with the given logical CPU
  *
@@ -300,24 +325,10 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
  */
 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
 {
-        struct device_node *cpun, *cpus;
-
-        cpus = of_find_node_by_path("/cpus");
-        if (!cpus)
-                return NULL;
+        struct device_node *cpun;
 
-        for_each_child_of_node(cpus, cpun) {
-                if (of_node_cmp(cpun->type, "cpu"))
-                        continue;
-                /* Check for non-standard "ibm,ppc-interrupt-server#s" property
-                 * for thread ids on PowerPC. If it doesn't exist fallback to
-                 * standard "reg" property.
-                 */
-                if (IS_ENABLED(CONFIG_PPC) &&
-                        __of_find_n_match_cpu_property(cpun,
-                                "ibm,ppc-interrupt-server#s", cpu, thread))
-                        return cpun;
-                if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread))
+        for_each_node_by_type(cpun, "cpu") {
+                if (arch_find_n_match_cpu_physical_id(cpun, cpu, thread))
                         return cpun;
         }
         return NULL;