GNU Linux-libre 4.14.266-gnu1
[releases.git] / arch / x86 / mm / srat.c
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->apic_id_valid(apic_id)) {
44                 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
45                          pxm, apic_id);
46                 return;
47         }
48         node = acpi_map_pxm_to_node(pxm);
49         if (node < 0) {
50                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
51                 bad_srat();
52                 return;
53         }
54
55         if (apic_id >= MAX_LOCAL_APIC) {
56                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
57                 return;
58         }
59         set_apicid_to_node(apic_id, node);
60         node_set(node, numa_nodes_parsed);
61         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
62                pxm, apic_id, node);
63 }
64
65 /* Callback for Proximity Domain -> LAPIC mapping */
66 void __init
67 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
68 {
69         int pxm, node;
70         int apic_id;
71
72         if (srat_disabled())
73                 return;
74         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
75                 bad_srat();
76                 return;
77         }
78         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
79                 return;
80         pxm = pa->proximity_domain_lo;
81         if (acpi_srat_revision >= 2)
82                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
83         node = acpi_map_pxm_to_node(pxm);
84         if (node < 0) {
85                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
86                 bad_srat();
87                 return;
88         }
89
90         if (get_uv_system_type() >= UV_X2APIC)
91                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
92         else
93                 apic_id = pa->apic_id;
94
95         if (apic_id >= MAX_LOCAL_APIC) {
96                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
97                 return;
98         }
99
100         set_apicid_to_node(apic_id, node);
101         node_set(node, numa_nodes_parsed);
102         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
103                pxm, apic_id, node);
104 }
105
106 int __init x86_acpi_numa_init(void)
107 {
108         int ret;
109
110         ret = acpi_numa_init();
111         if (ret < 0)
112                 return ret;
113         return srat_disabled() ? -EINVAL : 0;
114 }