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1 /*
2  * ACPI 3.0 based NUMA setup
3  * Copyright 2004 Andi Kleen, SuSE Labs.
4  *
5  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
6  *
7  * Called from acpi_numa_init while reading the SRAT and SLIT tables.
8  * Assumes all memory regions belonging to a single proximity domain
9  * are in one chunk. Holes between them will be included in the node.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/acpi.h>
14 #include <linux/mmzone.h>
15 #include <linux/bitmap.h>
16 #include <linux/module.h>
17 #include <linux/topology.h>
18 #include <linux/bootmem.h>
19 #include <linux/memblock.h>
20 #include <linux/mm.h>
21 #include <asm/proto.h>
22 #include <asm/numa.h>
23 #include <asm/e820.h>
24 #include <asm/apic.h>
25 #include <asm/uv/uv.h>
26 
27 int acpi_numa __initdata;
28 
setup_node(int pxm)29 static __init int setup_node(int pxm)
30 {
31 	return acpi_map_pxm_to_node(pxm);
32 }
33 
bad_srat(void)34 static __init void bad_srat(void)
35 {
36 	printk(KERN_ERR "SRAT: SRAT not used.\n");
37 	acpi_numa = -1;
38 }
39 
srat_disabled(void)40 static __init inline int srat_disabled(void)
41 {
42 	return acpi_numa < 0;
43 }
44 
45 /*
46  * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
47  * I/O localities since SRAT does not list them.  I/O localities are
48  * not supported at this point.
49  */
acpi_numa_slit_init(struct acpi_table_slit * slit)50 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
51 {
52 	int i, j;
53 
54 	for (i = 0; i < slit->locality_count; i++) {
55 		const int from_node = pxm_to_node(i);
56 
57 		if (from_node == NUMA_NO_NODE)
58 			continue;
59 
60 		for (j = 0; j < slit->locality_count; j++) {
61 			const int to_node = pxm_to_node(j);
62 
63 			if (to_node == NUMA_NO_NODE)
64 				continue;
65 
66 			numa_set_distance(from_node, to_node,
67 				slit->entry[slit->locality_count * i + j]);
68 		}
69 	}
70 }
71 
72 /* Callback for Proximity Domain -> x2APIC mapping */
73 void __init
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity * pa)74 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
75 {
76 	int pxm, node;
77 	int apic_id;
78 
79 	if (srat_disabled())
80 		return;
81 	if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
82 		bad_srat();
83 		return;
84 	}
85 	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
86 		return;
87 	pxm = pa->proximity_domain;
88 	apic_id = pa->apic_id;
89 	if (!apic->apic_id_valid(apic_id)) {
90 		printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
91 			 pxm, apic_id);
92 		return;
93 	}
94 	node = setup_node(pxm);
95 	if (node < 0) {
96 		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
97 		bad_srat();
98 		return;
99 	}
100 
101 	if (apic_id >= MAX_LOCAL_APIC) {
102 		printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
103 		return;
104 	}
105 	set_apicid_to_node(apic_id, node);
106 	node_set(node, numa_nodes_parsed);
107 	acpi_numa = 1;
108 	printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
109 	       pxm, apic_id, node);
110 }
111 
112 /* Callback for Proximity Domain -> LAPIC mapping */
113 void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity * pa)114 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
115 {
116 	int pxm, node;
117 	int apic_id;
118 
119 	if (srat_disabled())
120 		return;
121 	if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
122 		bad_srat();
123 		return;
124 	}
125 	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
126 		return;
127 	pxm = pa->proximity_domain_lo;
128 	if (acpi_srat_revision >= 2)
129 		pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
130 	node = setup_node(pxm);
131 	if (node < 0) {
132 		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
133 		bad_srat();
134 		return;
135 	}
136 
137 	if (get_uv_system_type() >= UV_X2APIC)
138 		apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
139 	else
140 		apic_id = pa->apic_id;
141 
142 	if (apic_id >= MAX_LOCAL_APIC) {
143 		printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
144 		return;
145 	}
146 
147 	set_apicid_to_node(apic_id, node);
148 	node_set(node, numa_nodes_parsed);
149 	acpi_numa = 1;
150 	printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
151 	       pxm, apic_id, node);
152 }
153 
154 #ifdef CONFIG_MEMORY_HOTPLUG
save_add_info(void)155 static inline int save_add_info(void) {return 1;}
156 #else
save_add_info(void)157 static inline int save_add_info(void) {return 0;}
158 #endif
159 
160 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
161 int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity * ma)162 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
163 {
164 	u64 start, end;
165 	u32 hotpluggable;
166 	int node, pxm;
167 
168 	if (srat_disabled())
169 		goto out_err;
170 	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
171 		goto out_err_bad_srat;
172 	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
173 		goto out_err;
174 	hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
175 	if (hotpluggable && !save_add_info())
176 		goto out_err;
177 
178 	start = ma->base_address;
179 	end = start + ma->length;
180 	pxm = ma->proximity_domain;
181 	if (acpi_srat_revision <= 1)
182 		pxm &= 0xff;
183 
184 	node = setup_node(pxm);
185 	if (node < 0) {
186 		printk(KERN_ERR "SRAT: Too many proximity domains.\n");
187 		goto out_err_bad_srat;
188 	}
189 
190 	if (numa_add_memblk(node, start, end) < 0)
191 		goto out_err_bad_srat;
192 
193 	node_set(node, numa_nodes_parsed);
194 
195 	pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",
196 		node, pxm,
197 		(unsigned long long) start, (unsigned long long) end - 1,
198 		hotpluggable ? " hotplug" : "",
199 		ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");
200 
201 	/* Mark hotplug range in memblock. */
202 	if (hotpluggable && memblock_mark_hotplug(start, ma->length))
203 		pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
204 			(unsigned long long)start, (unsigned long long)end - 1);
205 
206 	return 0;
207 out_err_bad_srat:
208 	bad_srat();
209 out_err:
210 	return -1;
211 }
212 
acpi_numa_arch_fixup(void)213 void __init acpi_numa_arch_fixup(void) {}
214 
x86_acpi_numa_init(void)215 int __init x86_acpi_numa_init(void)
216 {
217 	int ret;
218 
219 	ret = acpi_numa_init();
220 	if (ret < 0)
221 		return ret;
222 	return srat_disabled() ? -EINVAL : 0;
223 }
224