Merge tag 'sunxi-fixes-for-4.3' of https://git.kernel.org/pub/scm/linux/kernel/git...
[linux-drm-fsl-dcu.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                 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
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
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
155 static inline int save_add_info(void) {return 1;}
156 #else
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
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
213 void __init acpi_numa_arch_fixup(void) {}
214
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 }