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 */
27 void __init
28 acpi_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 */
65 void __init
66 acpi_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
105 int __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
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