xref: /openbmc/linux/arch/x86/mm/srat.c (revision f5c27da4)
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 }
115