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For NUMA emulation, our SLIT should represent the true NUMA topology of the system but our proximity domain to node ID mapping needs to reflect the emulated state. When NUMA emulation has successfully setup fake nodes on the system, a new function, acpi_fake_nodes() is called. This function determines the proximity domain (_PXM) for each true node found on the system. It then finds which emulated nodes have been allocated on this true node as determined by its starting address. The node ID to PXM mapping is changed so that each fake node ID points to the PXM of the true node that it is located on. If the machine failed to register a SLIT, then we assume there is no special requirement for emulated node affinity so we use the default LOCAL_DISTANCE, which is newly exported to this code, as our measurement if the emulated nodes appear in the same PXM. Otherwise, we use REMOTE_DISTANCE. PXM_INVAL and NID_INVAL are also exported to the ACPI header file so that we can compare node_to_pxm() results in generic code (in this case, the SRAT code). Cc: Len Brown <lenb@kernel.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
263 lines
6.4 KiB
C
263 lines
6.4 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 <acpi/acpi_bus.h>
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#include <acpi/acmacros.h>
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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 __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
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= { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
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static int __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
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= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
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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 NID_INVAL;
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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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void __acpi_map_pxm_to_node(int pxm, int node)
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{
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pxm_to_node_map[pxm] = 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 = pxm_to_node_map[pxm];
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if (node < 0){
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if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
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return NID_INVAL;
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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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void __cpuinit acpi_unmap_pxm_to_node(int node)
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{
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int pxm = node_to_pxm_map[node];
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pxm_to_node_map[pxm] = NID_INVAL;
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node_to_pxm_map[node] = PXM_INVAL;
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node_clear(node, nodes_found_map);
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}
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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 type 0x%x) in proximity domain %d %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->memory_type, 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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}
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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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static int __init acpi_parse_slit(struct acpi_table_header *table)
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{
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struct acpi_table_slit *slit;
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u32 localities;
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if (!table)
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return -EINVAL;
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slit = (struct acpi_table_slit *)table;
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/* downcast just for %llu vs %lu for i386/ia64 */
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localities = (u32) slit->locality_count;
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acpi_numa_slit_init(slit);
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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 __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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acpi_numa_memory_affinity_init(memory_affinity);
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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;
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if (!table)
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return -EINVAL;
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srat = (struct acpi_table_srat *)table;
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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_table_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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/* 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_CPU_AFFINITY,
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acpi_parse_processor_affinity, NR_CPUS);
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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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return 0;
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}
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int acpi_get_pxm(acpi_handle h)
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{
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unsigned 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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EXPORT_SYMBOL(acpi_get_pxm);
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int acpi_get_node(acpi_handle *handle)
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{
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int pxm, node = -1;
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pxm = acpi_get_pxm(handle);
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if (pxm >= 0)
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node = acpi_map_pxm_to_node(pxm);
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return node;
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}
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EXPORT_SYMBOL(acpi_get_node);
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