of, numa: Add NUMA of binding implementation.

Add device tree parsing for NUMA topology using device
"numa-node-id" property in distance-map and cpu nodes.

This is a complete rewrite of a previous patch by:
   Ganapatrao Kulkarni<gkulkarni@caviumnetworks.com>

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

4 files changed, 224 insertions, 0 deletions

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index e2a48415d969..b3bec3aaa45d 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -112,4 +112,7 @@ config OF_OVERLAY
           While this option is selected automatically when needed, you can
           enable it manually to improve device tree unit test coverage.
 
+config OF_NUMA
+        bool
+
 endif # OF
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 156c072b3117..bee3fa96b981 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -14,5 +14,6 @@ obj-$(CONFIG_OF_MTD)	+= of_mtd.o
 obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
+obj-$(CONFIG_OF_NUMA) += of_numa.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
new file mode 100644
index 000000000000..0f2784bc1874
--- /dev/null
+++ b/drivers/of/of_numa.c
@@ -0,0 +1,211 @@
+/*
+ * OF NUMA Parsing support.
+ *
+ * Copyright (C) 2015 - 2016 Cavium Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/nodemask.h>
+
+#include <asm/numa.h>
+
+/* define default numa node to 0 */
+#define DEFAULT_NODE 0
+
+/*
+ * Even though we connect cpus to numa domains later in SMP
+ * init, we need to know the node ids now for all cpus.
+*/
+static void __init of_numa_parse_cpu_nodes(void)
+{
+        u32 nid;
+        int r;
+        struct device_node *cpus;
+        struct device_node *np = NULL;
+
+        cpus = of_find_node_by_path("/cpus");
+        if (!cpus)
+                return;
+
+        for_each_child_of_node(cpus, np) {
+                /* Skip things that are not CPUs */
+                if (of_node_cmp(np->type, "cpu") != 0)
+                        continue;
+
+                r = of_property_read_u32(np, "numa-node-id", &nid);
+                if (r)
+                        continue;
+
+                pr_debug("NUMA: CPU on %u\n", nid);
+                if (nid >= MAX_NUMNODES)
+                        pr_warn("NUMA: Node id %u exceeds maximum value\n",
+                                nid);
+                else
+                        node_set(nid, numa_nodes_parsed);
+        }
+}
+
+static int __init of_numa_parse_memory_nodes(void)
+{
+        struct device_node *np = NULL;
+        struct resource rsrc;
+        u32 nid;
+        int r = 0;
+
+        for (;;) {
+                np = of_find_node_by_type(np, "memory");
+                if (!np)
+                        break;
+
+                r = of_property_read_u32(np, "numa-node-id", &nid);
+                if (r == -EINVAL)
+                        /*
+                         * property doesn't exist if -EINVAL, continue
+                         * looking for more memory nodes with
+                         * "numa-node-id" property
+                         */
+                        continue;
+                else if (r)
+                        /* some other error */
+                        break;
+
+                r = of_address_to_resource(np, 0, &rsrc);
+                if (r) {
+                        pr_err("NUMA: bad reg property in memory node\n");
+                        break;
+                }
+
+                pr_debug("NUMA:  base = %llx len = %llx, node = %u\n",
+                         rsrc.start, rsrc.end - rsrc.start + 1, nid);
+
+                r = numa_add_memblk(nid, rsrc.start,
+                                    rsrc.end - rsrc.start + 1);
+                if (r)
+                        break;
+        }
+        of_node_put(np);
+
+        return r;
+}
+
+static int __init of_numa_parse_distance_map_v1(struct device_node *map)
+{
+        const __be32 *matrix;
+        int entry_count;
+        int i;
+
+        pr_info("NUMA: parsing numa-distance-map-v1\n");
+
+        matrix = of_get_property(map, "distance-matrix", NULL);
+        if (!matrix) {
+                pr_err("NUMA: No distance-matrix property in distance-map\n");
+                return -EINVAL;
+        }
+
+        entry_count = of_property_count_u32_elems(map, "distance-matrix");
+        if (entry_count <= 0) {
+                pr_err("NUMA: Invalid distance-matrix\n");
+                return -EINVAL;
+        }
+
+        for (i = 0; i + 2 < entry_count; i += 3) {
+                u32 nodea, nodeb, distance;
+
+                nodea = of_read_number(matrix, 1);
+                matrix++;
+                nodeb = of_read_number(matrix, 1);
+                matrix++;
+                distance = of_read_number(matrix, 1);
+                matrix++;
+
+                numa_set_distance(nodea, nodeb, distance);
+                pr_debug("NUMA:  distance[node%d -> node%d] = %d\n",
+                         nodea, nodeb, distance);
+
+                /* Set default distance of node B->A same as A->B */
+                if (nodeb > nodea)
+                        numa_set_distance(nodeb, nodea, distance);
+        }
+
+        return 0;
+}
+
+static int __init of_numa_parse_distance_map(void)
+{
+        int ret = 0;
+        struct device_node *np;
+
+        np = of_find_compatible_node(NULL, NULL,
+                                     "numa-distance-map-v1");
+        if (np)
+                ret = of_numa_parse_distance_map_v1(np);
+
+        of_node_put(np);
+        return ret;
+}
+
+int of_node_to_nid(struct device_node *device)
+{
+        struct device_node *np;
+        u32 nid;
+        int r = -ENODATA;
+
+        np = of_node_get(device);
+
+        while (np) {
+                struct device_node *parent;
+
+                r = of_property_read_u32(np, "numa-node-id", &nid);
+                /*
+                 * -EINVAL indicates the property was not found, and
+                 *  we walk up the tree trying to find a parent with a
+                 *  "numa-node-id".  Any other type of error indicates
+                 *  a bad device tree and we give up.
+                 */
+                if (r != -EINVAL)
+                        break;
+
+                parent = of_get_parent(np);
+                of_node_put(np);
+                np = parent;
+        }
+        if (np && r)
+                pr_warn("NUMA: Invalid \"numa-node-id\" property in node %s\n",
+                        np->name);
+        of_node_put(np);
+
+        if (!r) {
+                if (nid >= MAX_NUMNODES)
+                        pr_warn("NUMA: Node id %u exceeds maximum value\n",
+                                nid);
+                else
+                        return nid;
+        }
+
+        return NUMA_NO_NODE;
+}
+EXPORT_SYMBOL(of_node_to_nid);
+
+int __init of_numa_init(void)
+{
+        int r;
+
+        of_numa_parse_cpu_nodes();
+        r = of_numa_parse_memory_nodes();
+        if (r)
+                return r;
+        return of_numa_parse_distance_map();
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 7fcb681baadf..76f07c84040f 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -685,6 +685,15 @@ static inline int of_node_to_nid(struct device_node *device)
 }
 #endif
 
+#ifdef CONFIG_OF_NUMA
+extern int of_numa_init(void);
+#else
+static inline int of_numa_init(void)
+{
+        return -ENOSYS;
+}
+#endif
+
 static inline struct device_node *of_find_matching_node(
         struct device_node *from,
         const struct of_device_id *matches)