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
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity * pa)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
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity * pa)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 
x86_acpi_numa_init(void)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