381 lines
9.7 KiB
C
381 lines
9.7 KiB
C
/*
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* acpi_numa.c - ACPI NUMA support
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*
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* Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/numa.h>
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#include <linux/nodemask.h>
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#include <linux/topology.h>
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#define PREFIX "ACPI: "
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#define ACPI_NUMA 0x80000000
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#define _COMPONENT ACPI_NUMA
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ACPI_MODULE_NAME("numa");
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static nodemask_t nodes_found_map = NODE_MASK_NONE;
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/* maps to convert between proximity domain and logical node ID */
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static int pxm_to_node_map[MAX_PXM_DOMAINS]
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= { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
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static int node_to_pxm_map[MAX_NUMNODES]
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= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
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unsigned char acpi_srat_revision __initdata;
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int pxm_to_node(int pxm)
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{
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if (pxm < 0)
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return NUMA_NO_NODE;
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return pxm_to_node_map[pxm];
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}
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int node_to_pxm(int node)
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{
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if (node < 0)
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return PXM_INVAL;
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return node_to_pxm_map[node];
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}
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static void __acpi_map_pxm_to_node(int pxm, int node)
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{
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if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
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pxm_to_node_map[pxm] = node;
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if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
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node_to_pxm_map[node] = pxm;
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}
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int acpi_map_pxm_to_node(int pxm)
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{
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int node;
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if (pxm < 0 || pxm >= MAX_PXM_DOMAINS)
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return NUMA_NO_NODE;
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node = pxm_to_node_map[pxm];
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if (node == NUMA_NO_NODE) {
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if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
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return NUMA_NO_NODE;
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node = first_unset_node(nodes_found_map);
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__acpi_map_pxm_to_node(pxm, node);
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node_set(node, nodes_found_map);
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}
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return node;
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}
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/**
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* acpi_map_pxm_to_online_node - Map proximity ID to online node
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* @pxm: ACPI proximity ID
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*
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* This is similar to acpi_map_pxm_to_node(), but always returns an online
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* node. When the mapped node from a given proximity ID is offline, it
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* looks up the node distance table and returns the nearest online node.
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*
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* ACPI device drivers, which are called after the NUMA initialization has
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* completed in the kernel, can call this interface to obtain their device
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* NUMA topology from ACPI tables. Such drivers do not have to deal with
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* offline nodes. A node may be offline when a device proximity ID is
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* unique, SRAT memory entry does not exist, or NUMA is disabled, ex.
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* "numa=off" on x86.
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*/
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int acpi_map_pxm_to_online_node(int pxm)
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{
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int node, n, dist, min_dist;
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node = acpi_map_pxm_to_node(pxm);
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if (node == NUMA_NO_NODE)
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node = 0;
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if (!node_online(node)) {
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min_dist = INT_MAX;
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for_each_online_node(n) {
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dist = node_distance(node, n);
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if (dist < min_dist) {
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min_dist = dist;
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node = n;
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}
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}
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}
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return node;
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}
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EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
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static void __init
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acpi_table_print_srat_entry(struct acpi_subtable_header *header)
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{
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ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
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if (!header)
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return;
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switch (header->type) {
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case ACPI_SRAT_TYPE_CPU_AFFINITY:
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#ifdef ACPI_DEBUG_OUTPUT
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{
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struct acpi_srat_cpu_affinity *p =
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(struct acpi_srat_cpu_affinity *)header;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
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p->apic_id, p->local_sapic_eid,
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p->proximity_domain_lo,
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(p->flags & ACPI_SRAT_CPU_ENABLED)?
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"enabled" : "disabled"));
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}
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#endif /* ACPI_DEBUG_OUTPUT */
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break;
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case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
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#ifdef ACPI_DEBUG_OUTPUT
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{
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struct acpi_srat_mem_affinity *p =
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(struct acpi_srat_mem_affinity *)header;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
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(unsigned long)p->base_address,
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(unsigned long)p->length,
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p->proximity_domain,
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(p->flags & ACPI_SRAT_MEM_ENABLED)?
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"enabled" : "disabled",
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(p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
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" hot-pluggable" : "",
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(p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
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" non-volatile" : ""));
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}
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#endif /* ACPI_DEBUG_OUTPUT */
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break;
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case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
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#ifdef ACPI_DEBUG_OUTPUT
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{
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struct acpi_srat_x2apic_cpu_affinity *p =
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(struct acpi_srat_x2apic_cpu_affinity *)header;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"SRAT Processor (x2apicid[0x%08x]) in"
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" proximity domain %d %s\n",
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p->apic_id,
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p->proximity_domain,
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(p->flags & ACPI_SRAT_CPU_ENABLED) ?
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"enabled" : "disabled"));
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}
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#endif /* ACPI_DEBUG_OUTPUT */
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break;
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default:
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printk(KERN_WARNING PREFIX
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"Found unsupported SRAT entry (type = 0x%x)\n",
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header->type);
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break;
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}
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}
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/*
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* A lot of BIOS fill in 10 (= no distance) everywhere. This messes
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* up the NUMA heuristics which wants the local node to have a smaller
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* distance than the others.
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* Do some quick checks here and only use the SLIT if it passes.
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*/
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static int __init slit_valid(struct acpi_table_slit *slit)
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{
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int i, j;
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int d = slit->locality_count;
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for (i = 0; i < d; i++) {
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for (j = 0; j < d; j++) {
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u8 val = slit->entry[d*i + j];
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if (i == j) {
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if (val != LOCAL_DISTANCE)
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return 0;
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} else if (val <= LOCAL_DISTANCE)
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return 0;
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}
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}
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return 1;
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}
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static int __init acpi_parse_slit(struct acpi_table_header *table)
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{
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struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
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if (!slit_valid(slit)) {
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printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
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return -EINVAL;
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}
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acpi_numa_slit_init(slit);
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return 0;
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}
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void __init __weak
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acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
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{
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printk(KERN_WARNING PREFIX
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"Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
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return;
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}
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static int __init
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acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
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const unsigned long end)
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{
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struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
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processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
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if (!processor_affinity)
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return -EINVAL;
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acpi_table_print_srat_entry(header);
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/* let architecture-dependent part to do it */
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acpi_numa_x2apic_affinity_init(processor_affinity);
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return 0;
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}
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static int __init
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acpi_parse_processor_affinity(struct acpi_subtable_header *header,
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const unsigned long end)
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{
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struct acpi_srat_cpu_affinity *processor_affinity;
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processor_affinity = (struct acpi_srat_cpu_affinity *)header;
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if (!processor_affinity)
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return -EINVAL;
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acpi_table_print_srat_entry(header);
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/* let architecture-dependent part to do it */
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acpi_numa_processor_affinity_init(processor_affinity);
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return 0;
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}
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static int __initdata parsed_numa_memblks;
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static int __init
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acpi_parse_memory_affinity(struct acpi_subtable_header * header,
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const unsigned long end)
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{
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struct acpi_srat_mem_affinity *memory_affinity;
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memory_affinity = (struct acpi_srat_mem_affinity *)header;
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if (!memory_affinity)
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return -EINVAL;
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acpi_table_print_srat_entry(header);
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/* let architecture-dependent part to do it */
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if (!acpi_numa_memory_affinity_init(memory_affinity))
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parsed_numa_memblks++;
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return 0;
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}
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static int __init acpi_parse_srat(struct acpi_table_header *table)
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{
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struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
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acpi_srat_revision = srat->header.revision;
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/* Real work done in acpi_table_parse_srat below. */
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return 0;
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}
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static int __init
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acpi_table_parse_srat(enum acpi_srat_type id,
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acpi_tbl_entry_handler handler, unsigned int max_entries)
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{
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return acpi_table_parse_entries(ACPI_SIG_SRAT,
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sizeof(struct acpi_table_srat), id,
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handler, max_entries);
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}
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int __init acpi_numa_init(void)
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{
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int cnt = 0;
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/*
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* Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
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* SRAT cpu entries could have different order with that in MADT.
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* So go over all cpu entries in SRAT to get apicid to node mapping.
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*/
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/* SRAT: Static Resource Affinity Table */
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if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
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acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
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acpi_parse_x2apic_affinity, 0);
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acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
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acpi_parse_processor_affinity, 0);
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cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
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acpi_parse_memory_affinity,
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NR_NODE_MEMBLKS);
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}
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/* SLIT: System Locality Information Table */
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acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
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acpi_numa_arch_fixup();
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if (cnt < 0)
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return cnt;
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else if (!parsed_numa_memblks)
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return -ENOENT;
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return 0;
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}
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static int acpi_get_pxm(acpi_handle h)
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{
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unsigned long long pxm;
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acpi_status status;
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acpi_handle handle;
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acpi_handle phandle = h;
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do {
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handle = phandle;
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status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
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if (ACPI_SUCCESS(status))
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return pxm;
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status = acpi_get_parent(handle, &phandle);
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} while (ACPI_SUCCESS(status));
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return -1;
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}
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int acpi_get_node(acpi_handle handle)
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{
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int pxm;
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pxm = acpi_get_pxm(handle);
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return acpi_map_pxm_to_node(pxm);
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}
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EXPORT_SYMBOL(acpi_get_node);
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