// SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_numa.c - ACPI NUMA support * * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> */ #define pr_fmt(fmt) "ACPI: " fmt #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/acpi.h> #include <linux/memblock.h> #include <linux/numa.h> #include <linux/nodemask.h> #include <linux/topology.h> static nodemask_t nodes_found_map = NODE_MASK_NONE; /* maps to convert between proximity domain and logical node ID */ static int pxm_to_node_map[MAX_PXM_DOMAINS] = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; static int node_to_pxm_map[MAX_NUMNODES] = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; unsigned char acpi_srat_revision __initdata; int acpi_numa __initdata; int pxm_to_node(int pxm) { if (pxm < 0) return NUMA_NO_NODE; return pxm_to_node_map[pxm]; } int node_to_pxm(int node) { if (node < 0) return PXM_INVAL; return node_to_pxm_map[node]; } static void __acpi_map_pxm_to_node(int pxm, int node) { if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) pxm_to_node_map[pxm] = node; if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) node_to_pxm_map[node] = pxm; } int acpi_map_pxm_to_node(int pxm) { int node; if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) return NUMA_NO_NODE; node = pxm_to_node_map[pxm]; if (node == NUMA_NO_NODE) { if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) return NUMA_NO_NODE; node = first_unset_node(nodes_found_map); __acpi_map_pxm_to_node(pxm, node); node_set(node, nodes_found_map); } return node; } EXPORT_SYMBOL(acpi_map_pxm_to_node); /** * acpi_map_pxm_to_online_node - Map proximity ID to online node * @pxm: ACPI proximity ID * * This is similar to acpi_map_pxm_to_node(), but always returns an online * node. When the mapped node from a given proximity ID is offline, it * looks up the node distance table and returns the nearest online node. * * ACPI device drivers, which are called after the NUMA initialization has * completed in the kernel, can call this interface to obtain their device * NUMA topology from ACPI tables. Such drivers do not have to deal with * offline nodes. A node may be offline when a device proximity ID is * unique, SRAT memory entry does not exist, or NUMA is disabled, ex. * "numa=off" on x86. */ int acpi_map_pxm_to_online_node(int pxm) { int node, min_node; node = acpi_map_pxm_to_node(pxm); if (node == NUMA_NO_NODE) node = 0; min_node = node; if (!node_online(node)) { int min_dist = INT_MAX, dist, n; for_each_online_node(n) { dist = node_distance(node, n); if (dist < min_dist) { min_dist = dist; min_node = n; } } } return min_node; } EXPORT_SYMBOL(acpi_map_pxm_to_online_node); static void __init acpi_table_print_srat_entry(struct acpi_subtable_header *header) { switch (header->type) { case ACPI_SRAT_TYPE_CPU_AFFINITY: { struct acpi_srat_cpu_affinity *p = (struct acpi_srat_cpu_affinity *)header; pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", p->apic_id, p->local_sapic_eid, p->proximity_domain_lo, (p->flags & ACPI_SRAT_CPU_ENABLED) ? "enabled" : "disabled"); } break; case ACPI_SRAT_TYPE_MEMORY_AFFINITY: { struct acpi_srat_mem_affinity *p = (struct acpi_srat_mem_affinity *)header; pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n", (unsigned long long)p->base_address, (unsigned long long)p->length, p->proximity_domain, (p->flags & ACPI_SRAT_MEM_ENABLED) ? "enabled" : "disabled", (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? " hot-pluggable" : "", (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? " non-volatile" : ""); } break; case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: { struct acpi_srat_x2apic_cpu_affinity *p = (struct acpi_srat_x2apic_cpu_affinity *)header; pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", p->apic_id, p->proximity_domain, (p->flags & ACPI_SRAT_CPU_ENABLED) ? "enabled" : "disabled"); } break; case ACPI_SRAT_TYPE_GICC_AFFINITY: { struct acpi_srat_gicc_affinity *p = (struct acpi_srat_gicc_affinity *)header; pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", p->acpi_processor_uid, p->proximity_domain, (p->flags & ACPI_SRAT_GICC_ENABLED) ? "enabled" : "disabled"); } break; default: pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", header->type); break; } } /* * A lot of BIOS fill in 10 (= no distance) everywhere. This messes * up the NUMA heuristics which wants the local node to have a smaller * distance than the others. * Do some quick checks here and only use the SLIT if it passes. */ static int __init slit_valid(struct acpi_table_slit *slit) { int i, j; int d = slit->locality_count; for (i = 0; i < d; i++) { for (j = 0; j < d; j++) { u8 val = slit->entry[d*i + j]; if (i == j) { if (val != LOCAL_DISTANCE) return 0; } else if (val <= LOCAL_DISTANCE) return 0; } } return 1; } void __init bad_srat(void) { pr_err("SRAT: SRAT not used.\n"); acpi_numa = -1; } int __init srat_disabled(void) { return acpi_numa < 0; } #if defined(CONFIG_X86) || defined(CONFIG_ARM64) /* * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for * I/O localities since SRAT does not list them. I/O localities are * not supported at this point. */ void __init acpi_numa_slit_init(struct acpi_table_slit *slit) { int i, j; for (i = 0; i < slit->locality_count; i++) { const int from_node = pxm_to_node(i); if (from_node == NUMA_NO_NODE) continue; for (j = 0; j < slit->locality_count; j++) { const int to_node = pxm_to_node(j); if (to_node == NUMA_NO_NODE) continue; numa_set_distance(from_node, to_node, slit->entry[slit->locality_count * i + j]); } } } /* * Default callback for parsing of the Proximity Domain <-> Memory * Area mappings */ int __init acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) { u64 start, end; u32 hotpluggable; int node, pxm; if (srat_disabled()) goto out_err; if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { pr_err("SRAT: Unexpected header length: %d\n", ma->header.length); goto out_err_bad_srat; } if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) goto out_err; hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE; if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) goto out_err; start = ma->base_address; end = start + ma->length; pxm = ma->proximity_domain; if (acpi_srat_revision <= 1) pxm &= 0xff; node = acpi_map_pxm_to_node(pxm); if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) { pr_err("SRAT: Too many proximity domains.\n"); goto out_err_bad_srat; } if (numa_add_memblk(node, start, end) < 0) { pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", node, (unsigned long long) start, (unsigned long long) end - 1); goto out_err_bad_srat; } node_set(node, numa_nodes_parsed); pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", node, pxm, (unsigned long long) start, (unsigned long long) end - 1, hotpluggable ? " hotplug" : "", ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); /* Mark hotplug range in memblock. */ if (hotpluggable && memblock_mark_hotplug(start, ma->length)) pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", (unsigned long long)start, (unsigned long long)end - 1); max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); return 0; out_err_bad_srat: bad_srat(); out_err: return -EINVAL; } #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ static int __init acpi_parse_slit(struct acpi_table_header *table) { struct acpi_table_slit *slit = (struct acpi_table_slit *)table; if (!slit_valid(slit)) { pr_info("SLIT table looks invalid. Not used.\n"); return -EINVAL; } acpi_numa_slit_init(slit); return 0; } void __init __weak acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) { pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); } static int __init acpi_parse_x2apic_affinity(union acpi_subtable_headers *header, const unsigned long end) { struct acpi_srat_x2apic_cpu_affinity *processor_affinity; processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; if (!processor_affinity) return -EINVAL; acpi_table_print_srat_entry(&header->common); /* let architecture-dependent part to do it */ acpi_numa_x2apic_affinity_init(processor_affinity); return 0; } static int __init acpi_parse_processor_affinity(union acpi_subtable_headers *header, const unsigned long end) { struct acpi_srat_cpu_affinity *processor_affinity; processor_affinity = (struct acpi_srat_cpu_affinity *)header; if (!processor_affinity) return -EINVAL; acpi_table_print_srat_entry(&header->common); /* let architecture-dependent part to do it */ acpi_numa_processor_affinity_init(processor_affinity); return 0; } static int __init acpi_parse_gicc_affinity(union acpi_subtable_headers *header, const unsigned long end) { struct acpi_srat_gicc_affinity *processor_affinity; processor_affinity = (struct acpi_srat_gicc_affinity *)header; if (!processor_affinity) return -EINVAL; acpi_table_print_srat_entry(&header->common); /* let architecture-dependent part to do it */ acpi_numa_gicc_affinity_init(processor_affinity); return 0; } static int __initdata parsed_numa_memblks; static int __init acpi_parse_memory_affinity(union acpi_subtable_headers * header, const unsigned long end) { struct acpi_srat_mem_affinity *memory_affinity; memory_affinity = (struct acpi_srat_mem_affinity *)header; if (!memory_affinity) return -EINVAL; acpi_table_print_srat_entry(&header->common); /* let architecture-dependent part to do it */ if (!acpi_numa_memory_affinity_init(memory_affinity)) parsed_numa_memblks++; return 0; } static int __init acpi_parse_srat(struct acpi_table_header *table) { struct acpi_table_srat *srat = (struct acpi_table_srat *)table; acpi_srat_revision = srat->header.revision; /* Real work done in acpi_table_parse_srat below. */ return 0; } static int __init acpi_table_parse_srat(enum acpi_srat_type id, acpi_tbl_entry_handler handler, unsigned int max_entries) { return acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat), id, handler, max_entries); } int __init acpi_numa_init(void) { int cnt = 0; if (acpi_disabled) return -EINVAL; /* * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= * SRAT cpu entries could have different order with that in MADT. * So go over all cpu entries in SRAT to get apicid to node mapping. */ /* SRAT: System Resource Affinity Table */ if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { struct acpi_subtable_proc srat_proc[3]; memset(srat_proc, 0, sizeof(srat_proc)); srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; srat_proc[0].handler = acpi_parse_processor_affinity; srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; srat_proc[1].handler = acpi_parse_x2apic_affinity; srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; srat_proc[2].handler = acpi_parse_gicc_affinity; acpi_table_parse_entries_array(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat), srat_proc, ARRAY_SIZE(srat_proc), 0); cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, acpi_parse_memory_affinity, 0); } /* SLIT: System Locality Information Table */ acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); if (cnt < 0) return cnt; else if (!parsed_numa_memblks) return -ENOENT; return 0; } static int acpi_get_pxm(acpi_handle h) { unsigned long long pxm; acpi_status status; acpi_handle handle; acpi_handle phandle = h; do { handle = phandle; status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); if (ACPI_SUCCESS(status)) return pxm; status = acpi_get_parent(handle, &phandle); } while (ACPI_SUCCESS(status)); return -1; } int acpi_get_node(acpi_handle handle) { int pxm; pxm = acpi_get_pxm(handle); return acpi_map_pxm_to_node(pxm); } EXPORT_SYMBOL(acpi_get_node);