Commit 298535c0 authored by David Daney's avatar David Daney Committed by Will Deacon

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: default avatarDavid Daney <david.daney@cavium.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2bc4da1d
......@@ -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
......@@ -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/
/*
* 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();
}
......@@ -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)
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment