1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI 3.0 based NUMA setup
4 * Copyright 2004 Andi Kleen, SuSE Labs.
5 *
6 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
7 *
8 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
9 * Assumes all memory regions belonging to a single proximity domain
10 * are in one chunk. Holes between them will be included in the node.
11 */
12
13#include <linux/kernel.h>
14#include <linux/acpi.h>
15#include <linux/mmzone.h>
16#include <linux/bitmap.h>
17#include <linux/init.h>
18#include <linux/topology.h>
19#include <linux/mm.h>
20#include <asm/proto.h>
21#include <asm/numa.h>
22#include <asm/e820/api.h>
23#include <asm/apic.h>
24#include <asm/uv/uv.h>
25
26/* Callback for Proximity Domain -> x2APIC mapping */
27void __init
28acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
29{
30	int pxm, node;
31	int apic_id;
32
33	if (srat_disabled())
34		return;
35	if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
36		bad_srat();
37		return;
38	}
39	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
40		return;
41	pxm = pa->proximity_domain;
42	apic_id = pa->apic_id;
43	if (!apic_id_valid(apic_id)) {
44		pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id);
45		return;
46	}
47	node = acpi_map_pxm_to_node(pxm);
48	if (node < 0) {
49		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
50		bad_srat();
51		return;
52	}
53
54	if (apic_id >= MAX_LOCAL_APIC) {
55		printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
56		return;
57	}
58	set_apicid_to_node(apic_id, node);
59	node_set(node, numa_nodes_parsed);
60	printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
61	       pxm, apic_id, node);
62}
63
64/* Callback for Proximity Domain -> LAPIC mapping */
65void __init
66acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
67{
68	int pxm, node;
69	int apic_id;
70
71	if (srat_disabled())
72		return;
73	if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
74		bad_srat();
75		return;
76	}
77	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
78		return;
79	pxm = pa->proximity_domain_lo;
80	if (acpi_srat_revision >= 2)
81		pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
82	node = acpi_map_pxm_to_node(pxm);
83	if (node < 0) {
84		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
85		bad_srat();
86		return;
87	}
88
89	if (get_uv_system_type() >= UV_X2APIC)
90		apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
91	else
92		apic_id = pa->apic_id;
93
94	if (apic_id >= MAX_LOCAL_APIC) {
95		printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
96		return;
97	}
98
99	set_apicid_to_node(apic_id, node);
100	node_set(node, numa_nodes_parsed);
101	printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
102	       pxm, apic_id, node);
103}
104
105int __init x86_acpi_numa_init(void)
106{
107	int ret;
108
109	ret = acpi_numa_init();
110	if (ret < 0)
111		return ret;
112	return srat_disabled() ? -EINVAL : 0;
113}
114