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 pr_debug("SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", pxm, apic_id, node);
61 }
62
63 /* Callback for Proximity Domain -> LAPIC mapping */
64 void __init
65 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
66 {
67 int pxm, node;
68 int apic_id;
69
70 if (srat_disabled())
71 return;
72 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
73 bad_srat();
74 return;
75 }
76 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
77 return;
78 pxm = pa->proximity_domain_lo;
79 if (acpi_srat_revision >= 2)
80 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
81 node = acpi_map_pxm_to_node(pxm);
82 if (node < 0) {
83 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
84 bad_srat();
85 return;
86 }
87
88 if (get_uv_system_type() >= UV_X2APIC)
89 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
90 else
91 apic_id = pa->apic_id;
92
93 if (apic_id >= MAX_LOCAL_APIC) {
94 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
95 return;
96 }
97
98 set_apicid_to_node(apic_id, node);
99 node_set(node, numa_nodes_parsed);
100 pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node);
101 }
102
103 int __init x86_acpi_numa_init(void)
104 {
105 int ret;
106
107 ret = acpi_numa_init();
108 if (ret < 0)
109 return ret;
110 return srat_disabled() ? -EINVAL : 0;
111 }
112
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