diff options
Diffstat (limited to 'drivers/of/of_numa.c')
| -rw-r--r-- | drivers/of/of_numa.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c new file mode 100644 index 000000000..5949829a1 --- /dev/null +++ b/drivers/of/of_numa.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * OF NUMA Parsing support. + * + * Copyright (C) 2015 - 2016 Cavium Inc. + */ + +#define pr_fmt(fmt) "OF: NUMA: " fmt + +#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 *np; + + for_each_of_cpu_node(np) { + r = of_property_read_u32(np, "numa-node-id", &nid); + if (r) + continue; + + pr_debug("CPU on %u\n", nid); + if (nid >= MAX_NUMNODES) + pr_warn("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 i, r; + + for_each_node_by_type(np, "memory") { + 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; + + if (nid >= MAX_NUMNODES) { + pr_warn("Node id %u exceeds maximum value\n", nid); + r = -EINVAL; + } + + for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++) + r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1); + + if (!i || r) { + of_node_put(np); + pr_err("bad property in memory node\n"); + return r ? : -EINVAL; + } + } + + return 0; +} + +static int __init of_numa_parse_distance_map_v1(struct device_node *map) +{ + const __be32 *matrix; + int entry_count; + int i; + + pr_info("parsing numa-distance-map-v1\n"); + + matrix = of_get_property(map, "distance-matrix", NULL); + if (!matrix) { + pr_err("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("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++; + + if ((nodea == nodeb && distance != LOCAL_DISTANCE) || + (nodea != nodeb && distance <= LOCAL_DISTANCE)) { + pr_err("Invalid distance[node%d -> node%d] = %d\n", + nodea, nodeb, distance); + return -EINVAL; + } + + node_set(nodea, numa_nodes_parsed); + + numa_set_distance(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) { + 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; + + np = of_get_next_parent(np); + } + if (np && r) + pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n", + np); + of_node_put(np); + + /* + * If numa=off passed on command line, or with a defective + * device tree, the nid may not be in the set of possible + * nodes. Check for this case and return NUMA_NO_NODE. + */ + if (!r && nid < MAX_NUMNODES && node_possible(nid)) + return nid; + + return NUMA_NO_NODE; +} + +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(); +} |