Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[sfrench/cifs-2.6.git] / arch / x86 / mm / srat.c
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
29 static __init int setup_node(int pxm)
30 {
31         return acpi_map_pxm_to_node(pxm);
32 }
33
34 static __init void bad_srat(void)
35 {
36         printk(KERN_ERR "SRAT: SRAT not used.\n");
37         acpi_numa = -1;
38 }
39
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  */
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                 if (pxm_to_node(i) == NUMA_NO_NODE)
56                         continue;
57                 for (j = 0; j < slit->locality_count; j++) {
58                         if (pxm_to_node(j) == NUMA_NO_NODE)
59                                 continue;
60                         numa_set_distance(pxm_to_node(i), pxm_to_node(j),
61                                 slit->entry[slit->locality_count * i + j]);
62                 }
63         }
64 }
65
66 /* Callback for Proximity Domain -> x2APIC mapping */
67 void __init
68 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
69 {
70         int pxm, node;
71         int apic_id;
72
73         if (srat_disabled())
74                 return;
75         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
76                 bad_srat();
77                 return;
78         }
79         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
80                 return;
81         pxm = pa->proximity_domain;
82         apic_id = pa->apic_id;
83         if (!apic->apic_id_valid(apic_id)) {
84                 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
85                          pxm, apic_id);
86                 return;
87         }
88         node = setup_node(pxm);
89         if (node < 0) {
90                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
91                 bad_srat();
92                 return;
93         }
94
95         if (apic_id >= MAX_LOCAL_APIC) {
96                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
97                 return;
98         }
99         set_apicid_to_node(apic_id, node);
100         node_set(node, numa_nodes_parsed);
101         acpi_numa = 1;
102         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
103                pxm, apic_id, node);
104 }
105
106 /* Callback for Proximity Domain -> LAPIC mapping */
107 void __init
108 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
109 {
110         int pxm, node;
111         int apic_id;
112
113         if (srat_disabled())
114                 return;
115         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
116                 bad_srat();
117                 return;
118         }
119         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
120                 return;
121         pxm = pa->proximity_domain_lo;
122         if (acpi_srat_revision >= 2)
123                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
124         node = setup_node(pxm);
125         if (node < 0) {
126                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
127                 bad_srat();
128                 return;
129         }
130
131         if (get_uv_system_type() >= UV_X2APIC)
132                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
133         else
134                 apic_id = pa->apic_id;
135
136         if (apic_id >= MAX_LOCAL_APIC) {
137                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
138                 return;
139         }
140
141         set_apicid_to_node(apic_id, node);
142         node_set(node, numa_nodes_parsed);
143         acpi_numa = 1;
144         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
145                pxm, apic_id, node);
146 }
147
148 #ifdef CONFIG_MEMORY_HOTPLUG
149 static inline int save_add_info(void) {return 1;}
150 #else
151 static inline int save_add_info(void) {return 0;}
152 #endif
153
154 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
155 int __init
156 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
157 {
158         u64 start, end;
159         u32 hotpluggable;
160         int node, pxm;
161
162         if (srat_disabled())
163                 goto out_err;
164         if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
165                 goto out_err_bad_srat;
166         if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
167                 goto out_err;
168         hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
169         if (hotpluggable && !save_add_info())
170                 goto out_err;
171
172         start = ma->base_address;
173         end = start + ma->length;
174         pxm = ma->proximity_domain;
175         if (acpi_srat_revision <= 1)
176                 pxm &= 0xff;
177
178         node = setup_node(pxm);
179         if (node < 0) {
180                 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
181                 goto out_err_bad_srat;
182         }
183
184         if (numa_add_memblk(node, start, end) < 0)
185                 goto out_err_bad_srat;
186
187         node_set(node, numa_nodes_parsed);
188
189         pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s\n",
190                 node, pxm,
191                 (unsigned long long) start, (unsigned long long) end - 1,
192                 hotpluggable ? " hotplug" : "");
193
194         /* Mark hotplug range in memblock. */
195         if (hotpluggable && memblock_mark_hotplug(start, ma->length))
196                 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
197                         (unsigned long long)start, (unsigned long long)end - 1);
198
199         return 0;
200 out_err_bad_srat:
201         bad_srat();
202 out_err:
203         return -1;
204 }
205
206 void __init acpi_numa_arch_fixup(void) {}
207
208 int __init x86_acpi_numa_init(void)
209 {
210         int ret;
211
212         ret = acpi_numa_init();
213         if (ret < 0)
214                 return ret;
215         return srat_disabled() ? -EINVAL : 0;
216 }