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Message-Id: <1456959362-2036-4-git-send-email-ddaney.cavm@gmail.com>
Date: Wed, 2 Mar 2016 14:55:59 -0800
From: David Daney <ddaney.cavm@...il.com>
To: Will Deacon <will.deacon@....com>,
linux-arm-kernel@...ts.infradead.org,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>,
Grant Likely <grant.likely@...aro.org>,
Pawel Moll <pawel.moll@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
Robert Richter <rrichter@...ium.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Matt Fleming <matt@...eblueprint.co.uk>,
Mark Rutland <mark.rutland@....com>,
Catalin Marinas <catalin.marinas@....com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: [PATCH v13 3/6] of, numa: Add NUMA of binding implementation.
From: David Daney <david.daney@...ium.com>
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@...iumnetworks.com>
Signed-off-by: David Daney <david.daney@...ium.com>
---
drivers/of/Kconfig | 3 +
drivers/of/Makefile | 1 +
drivers/of/of_numa.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of.h | 9 +++
4 files changed, 213 insertions(+)
create mode 100644 drivers/of/of_numa.c
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index e2a4841..b3bec3a 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 156c072..bee3fa9 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 0000000..9727b60
--- /dev/null
+++ b/drivers/of/of_numa.c
@@ -0,0 +1,200 @@
+/*
+ * 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_fdt.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_find_cpu_nodes(void)
+{
+ u32 nid;
+ int r;
+ struct device_node *np = NULL;
+
+ for (;;) {
+ np = of_find_node_by_type(np, "cpu");
+ if (!np)
+ break;
+
+ 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 void __init of_parse_memory_nodes(void)
+{
+ struct device_node *np = NULL;
+ int na, ns;
+ const __be32 *prop;
+ unsigned int psize;
+ u32 nid;
+ u64 base, size;
+ int r;
+
+ for (;;) {
+ np = of_find_node_by_type(np, "memory");
+ if (!np)
+ break;
+
+ r = of_property_read_u32(np, "numa-node-id", &nid);
+ if (r)
+ continue;
+
+ prop = of_get_property(np, "reg", &psize);
+ if (!prop)
+ continue;
+
+ psize /= sizeof(__be32);
+ na = of_n_addr_cells(np);
+ ns = of_n_size_cells(np);
+
+ if (psize < na + ns) {
+ pr_err("NUMA: memory reg property too small\n");
+ continue;
+ }
+ base = of_read_number(prop, na);
+ size = of_read_number(prop + na, ns);
+
+ pr_debug("NUMA: base = %llx len = %llx, node = %u\n",
+ base, size, nid);
+
+ if (numa_add_memblk(nid, base, size) < 0)
+ break;
+ }
+
+ of_node_put(np);
+}
+
+static int __init parse_distance_map_v1(struct device_node *map)
+{
+ const __be32 *matrix;
+ unsigned int matrix_size;
+ int entry_count;
+ int i;
+ int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
+
+ pr_info("NUMA: parsing numa-distance-map-v1\n");
+
+ matrix = of_get_property(map, "distance-matrix", &matrix_size);
+ if (!matrix) {
+ pr_err("NUMA: No distance-matrix property in distance-map\n");
+ return -EINVAL;
+ }
+
+ entry_count = matrix_size / (sizeof(__be32) * 3 * nr_size_cells);
+
+ for (i = 0; i < entry_count; i++) {
+ u32 nodea, nodeb, distance;
+
+ nodea = of_read_number(matrix, nr_size_cells);
+ matrix += nr_size_cells;
+ nodeb = of_read_number(matrix, nr_size_cells);
+ matrix += nr_size_cells;
+ distance = of_read_number(matrix, nr_size_cells);
+ matrix += nr_size_cells;
+
+ 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_parse_distance_map(void)
+{
+ int ret = -EINVAL;
+ struct device_node *np = of_find_node_by_name(NULL, "distance-map");
+
+ if (!np)
+ return ret;
+
+ if (of_device_is_compatible(np, "numa-distance-map-v1")) {
+ ret = parse_distance_map_v1(np);
+ goto out;
+ }
+
+ pr_err("NUMA: invalid distance-map device node\n");
+out:
+ 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);
+ if (r != -EINVAL)
+ break;
+
+ /* property doesn't exist in this node, look in parent */
+ 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;
+}
+
+int __init of_numa_init(void)
+{
+ of_find_cpu_nodes();
+ of_parse_memory_nodes();
+ return of_parse_distance_map();
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index dc6e396..fe67a4c 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)
--
1.8.3.1
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