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|
/*
* acpi_numa.c - ACPI NUMA support
*
* Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#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/bootmem.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;
}
/**
* 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, n, dist, min_dist;
node = acpi_map_pxm_to_node(pxm);
if (node == NUMA_NO_NODE)
node = 0;
if (!node_online(node)) {
min_dist = INT_MAX;
for_each_online_node(n) {
dist = node_distance(node, n);
if (dist < min_dist) {
min_dist = dist;
node = n;
}
}
}
return 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%lx length 0x%lx) in proximity domain %d %s%s%s\n",
(unsigned long)p->base_address,
(unsigned 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
|