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 ...@@ -112,4 +112,7 @@ config OF_OVERLAY
While this option is selected automatically when needed, you can While this option is selected automatically when needed, you can
enable it manually to improve device tree unit test coverage. enable it manually to improve device tree unit test coverage.
config OF_NUMA
bool
endif # OF endif # OF
...@@ -14,5 +14,6 @@ obj-$(CONFIG_OF_MTD) += of_mtd.o ...@@ -14,5 +14,6 @@ obj-$(CONFIG_OF_MTD) += of_mtd.o
obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
obj-$(CONFIG_OF_RESOLVE) += resolver.o obj-$(CONFIG_OF_RESOLVE) += resolver.o
obj-$(CONFIG_OF_OVERLAY) += overlay.o obj-$(CONFIG_OF_OVERLAY) += overlay.o
obj-$(CONFIG_OF_NUMA) += of_numa.o
obj-$(CONFIG_OF_UNITTEST) += unittest-data/ 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) ...@@ -685,6 +685,15 @@ static inline int of_node_to_nid(struct device_node *device)
} }
#endif #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( static inline struct device_node *of_find_matching_node(
struct device_node *from, struct device_node *from,
const struct of_device_id *matches) const struct of_device_id *matches)
......
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