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drivers/of/of_numa.c
3.86 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * OF NUMA Parsing support. * * Copyright (C) 2015 - 2016 Cavium Inc. |
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*/ |
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#define pr_fmt(fmt) "OF: NUMA: " fmt |
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#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; |
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struct device_node *np; |
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for_each_of_cpu_node(np) { |
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r = of_property_read_u32(np, "numa-node-id", &nid); if (r) continue; |
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pr_debug("CPU on %u ", nid); |
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if (nid >= MAX_NUMNODES) |
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pr_warn("Node id %u exceeds maximum value ", nid); |
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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; |
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int i, r; |
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for_each_node_by_type(np, "memory") { |
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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; |
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if (nid >= MAX_NUMNODES) { |
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pr_warn("Node id %u exceeds maximum value ", nid); |
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r = -EINVAL; } |
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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); |
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pr_err("bad property in memory node "); |
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return r ? : -EINVAL; } |
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} |
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return 0; |
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} static int __init of_numa_parse_distance_map_v1(struct device_node *map) { const __be32 *matrix; int entry_count; int i; |
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pr_info("parsing numa-distance-map-v1 "); |
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matrix = of_get_property(map, "distance-matrix", NULL); if (!matrix) { |
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pr_err("No distance-matrix property in distance-map "); |
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return -EINVAL; } entry_count = of_property_count_u32_elems(map, "distance-matrix"); if (entry_count <= 0) { |
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pr_err("Invalid distance-matrix "); |
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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++; |
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if ((nodea == nodeb && distance != LOCAL_DISTANCE) || (nodea != nodeb && distance <= LOCAL_DISTANCE)) { pr_err("Invalid distance[node%d -> node%d] = %d ", nodea, nodeb, distance); return -EINVAL; } |
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numa_set_distance(nodea, nodeb, distance); |
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/* 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) { |
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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; |
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np = of_get_next_parent(np); |
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} if (np && r) |
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pr_warn("Invalid \"numa-node-id\" property in node %pOFn ", np); |
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of_node_put(np); |
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/* * 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)) |
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return nid; |
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return NUMA_NO_NODE; } |
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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(); } |