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ACPI / NUMA: Improve SRAT error detection and add messages
[karo-tx-linux.git] / drivers / acpi / numa.c
1 /*
2  *  acpi_numa.c - ACPI NUMA support
3  *
4  *  Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19  *
20  */
21
22 #define pr_fmt(fmt) "ACPI: " fmt
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/types.h>
28 #include <linux/errno.h>
29 #include <linux/acpi.h>
30 #include <linux/bootmem.h>
31 #include <linux/memblock.h>
32 #include <linux/numa.h>
33 #include <linux/nodemask.h>
34 #include <linux/topology.h>
35
36 static nodemask_t nodes_found_map = NODE_MASK_NONE;
37
38 /* maps to convert between proximity domain and logical node ID */
39 static int pxm_to_node_map[MAX_PXM_DOMAINS]
40                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
41 static int node_to_pxm_map[MAX_NUMNODES]
42                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
43
44 unsigned char acpi_srat_revision __initdata;
45 int acpi_numa __initdata;
46
47 int pxm_to_node(int pxm)
48 {
49         if (pxm < 0)
50                 return NUMA_NO_NODE;
51         return pxm_to_node_map[pxm];
52 }
53
54 int node_to_pxm(int node)
55 {
56         if (node < 0)
57                 return PXM_INVAL;
58         return node_to_pxm_map[node];
59 }
60
61 static void __acpi_map_pxm_to_node(int pxm, int node)
62 {
63         if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
64                 pxm_to_node_map[pxm] = node;
65         if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
66                 node_to_pxm_map[node] = pxm;
67 }
68
69 int acpi_map_pxm_to_node(int pxm)
70 {
71         int node;
72
73         if (pxm < 0 || pxm >= MAX_PXM_DOMAINS)
74                 return NUMA_NO_NODE;
75
76         node = pxm_to_node_map[pxm];
77
78         if (node == NUMA_NO_NODE) {
79                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
80                         return NUMA_NO_NODE;
81                 node = first_unset_node(nodes_found_map);
82                 __acpi_map_pxm_to_node(pxm, node);
83                 node_set(node, nodes_found_map);
84         }
85
86         return node;
87 }
88
89 /**
90  * acpi_map_pxm_to_online_node - Map proximity ID to online node
91  * @pxm: ACPI proximity ID
92  *
93  * This is similar to acpi_map_pxm_to_node(), but always returns an online
94  * node.  When the mapped node from a given proximity ID is offline, it
95  * looks up the node distance table and returns the nearest online node.
96  *
97  * ACPI device drivers, which are called after the NUMA initialization has
98  * completed in the kernel, can call this interface to obtain their device
99  * NUMA topology from ACPI tables.  Such drivers do not have to deal with
100  * offline nodes.  A node may be offline when a device proximity ID is
101  * unique, SRAT memory entry does not exist, or NUMA is disabled, ex.
102  * "numa=off" on x86.
103  */
104 int acpi_map_pxm_to_online_node(int pxm)
105 {
106         int node, n, dist, min_dist;
107
108         node = acpi_map_pxm_to_node(pxm);
109
110         if (node == NUMA_NO_NODE)
111                 node = 0;
112
113         if (!node_online(node)) {
114                 min_dist = INT_MAX;
115                 for_each_online_node(n) {
116                         dist = node_distance(node, n);
117                         if (dist < min_dist) {
118                                 min_dist = dist;
119                                 node = n;
120                         }
121                 }
122         }
123
124         return node;
125 }
126 EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
127
128 static void __init
129 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
130 {
131         switch (header->type) {
132         case ACPI_SRAT_TYPE_CPU_AFFINITY:
133                 {
134                         struct acpi_srat_cpu_affinity *p =
135                             (struct acpi_srat_cpu_affinity *)header;
136                         pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
137                                  p->apic_id, p->local_sapic_eid,
138                                  p->proximity_domain_lo,
139                                  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
140                                  "enabled" : "disabled");
141                 }
142                 break;
143
144         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
145                 {
146                         struct acpi_srat_mem_affinity *p =
147                             (struct acpi_srat_mem_affinity *)header;
148                         pr_debug("SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
149                                  (unsigned long)p->base_address,
150                                  (unsigned long)p->length,
151                                  p->proximity_domain,
152                                  (p->flags & ACPI_SRAT_MEM_ENABLED) ?
153                                  "enabled" : "disabled",
154                                  (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
155                                  " hot-pluggable" : "",
156                                  (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ?
157                                  " non-volatile" : "");
158                 }
159                 break;
160
161         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
162                 {
163                         struct acpi_srat_x2apic_cpu_affinity *p =
164                             (struct acpi_srat_x2apic_cpu_affinity *)header;
165                         pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n",
166                                  p->apic_id,
167                                  p->proximity_domain,
168                                  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
169                                  "enabled" : "disabled");
170                 }
171                 break;
172
173         default:
174                 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",
175                         header->type);
176                 break;
177         }
178 }
179
180 /*
181  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
182  * up the NUMA heuristics which wants the local node to have a smaller
183  * distance than the others.
184  * Do some quick checks here and only use the SLIT if it passes.
185  */
186 static int __init slit_valid(struct acpi_table_slit *slit)
187 {
188         int i, j;
189         int d = slit->locality_count;
190         for (i = 0; i < d; i++) {
191                 for (j = 0; j < d; j++)  {
192                         u8 val = slit->entry[d*i + j];
193                         if (i == j) {
194                                 if (val != LOCAL_DISTANCE)
195                                         return 0;
196                         } else if (val <= LOCAL_DISTANCE)
197                                 return 0;
198                 }
199         }
200         return 1;
201 }
202
203 void __init bad_srat(void)
204 {
205         pr_err("SRAT: SRAT not used.\n");
206         acpi_numa = -1;
207 }
208
209 int __init srat_disabled(void)
210 {
211         return acpi_numa < 0;
212 }
213
214 #if defined(CONFIG_X86) || defined(CONFIG_ARM64)
215 /*
216  * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
217  * I/O localities since SRAT does not list them.  I/O localities are
218  * not supported at this point.
219  */
220 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
221 {
222         int i, j;
223
224         for (i = 0; i < slit->locality_count; i++) {
225                 const int from_node = pxm_to_node(i);
226
227                 if (from_node == NUMA_NO_NODE)
228                         continue;
229
230                 for (j = 0; j < slit->locality_count; j++) {
231                         const int to_node = pxm_to_node(j);
232
233                         if (to_node == NUMA_NO_NODE)
234                                 continue;
235
236                         numa_set_distance(from_node, to_node,
237                                 slit->entry[slit->locality_count * i + j]);
238                 }
239         }
240 }
241
242 /*
243  * Default callback for parsing of the Proximity Domain <-> Memory
244  * Area mappings
245  */
246 int __init
247 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
248 {
249         u64 start, end;
250         u32 hotpluggable;
251         int node, pxm;
252
253         if (srat_disabled())
254                 goto out_err;
255         if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {
256                 pr_err("SRAT: Unexpected header length: %d\n",
257                        ma->header.length);
258                 goto out_err_bad_srat;
259         }
260         if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
261                 goto out_err;
262         hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
263         if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
264                 goto out_err;
265
266         start = ma->base_address;
267         end = start + ma->length;
268         pxm = ma->proximity_domain;
269         if (acpi_srat_revision <= 1)
270                 pxm &= 0xff;
271
272         node = acpi_map_pxm_to_node(pxm);
273         if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
274                 pr_err("SRAT: Too many proximity domains.\n");
275                 goto out_err_bad_srat;
276         }
277
278         if (numa_add_memblk(node, start, end) < 0) {
279                 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n",
280                        node, (unsigned long long) start,
281                        (unsigned long long) end - 1);
282                 goto out_err_bad_srat;
283         }
284
285         node_set(node, numa_nodes_parsed);
286
287         pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",
288                 node, pxm,
289                 (unsigned long long) start, (unsigned long long) end - 1,
290                 hotpluggable ? " hotplug" : "",
291                 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");
292
293         /* Mark hotplug range in memblock. */
294         if (hotpluggable && memblock_mark_hotplug(start, ma->length))
295                 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
296                         (unsigned long long)start, (unsigned long long)end - 1);
297
298         max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
299
300         return 0;
301 out_err_bad_srat:
302         bad_srat();
303 out_err:
304         return -EINVAL;
305 }
306 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
307
308 static int __init acpi_parse_slit(struct acpi_table_header *table)
309 {
310         struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
311
312         if (!slit_valid(slit)) {
313                 pr_info("SLIT table looks invalid. Not used.\n");
314                 return -EINVAL;
315         }
316         acpi_numa_slit_init(slit);
317
318         return 0;
319 }
320
321 void __init __weak
322 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
323 {
324         pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
325 }
326
327 static int __init
328 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
329                            const unsigned long end)
330 {
331         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
332
333         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
334         if (!processor_affinity)
335                 return -EINVAL;
336
337         acpi_table_print_srat_entry(header);
338
339         /* let architecture-dependent part to do it */
340         acpi_numa_x2apic_affinity_init(processor_affinity);
341
342         return 0;
343 }
344
345 static int __init
346 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
347                               const unsigned long end)
348 {
349         struct acpi_srat_cpu_affinity *processor_affinity;
350
351         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
352         if (!processor_affinity)
353                 return -EINVAL;
354
355         acpi_table_print_srat_entry(header);
356
357         /* let architecture-dependent part to do it */
358         acpi_numa_processor_affinity_init(processor_affinity);
359
360         return 0;
361 }
362
363 static int __initdata parsed_numa_memblks;
364
365 static int __init
366 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
367                            const unsigned long end)
368 {
369         struct acpi_srat_mem_affinity *memory_affinity;
370
371         memory_affinity = (struct acpi_srat_mem_affinity *)header;
372         if (!memory_affinity)
373                 return -EINVAL;
374
375         acpi_table_print_srat_entry(header);
376
377         /* let architecture-dependent part to do it */
378         if (!acpi_numa_memory_affinity_init(memory_affinity))
379                 parsed_numa_memblks++;
380         return 0;
381 }
382
383 static int __init acpi_parse_srat(struct acpi_table_header *table)
384 {
385         struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
386
387         acpi_srat_revision = srat->header.revision;
388
389         /* Real work done in acpi_table_parse_srat below. */
390
391         return 0;
392 }
393
394 static int __init
395 acpi_table_parse_srat(enum acpi_srat_type id,
396                       acpi_tbl_entry_handler handler, unsigned int max_entries)
397 {
398         return acpi_table_parse_entries(ACPI_SIG_SRAT,
399                                             sizeof(struct acpi_table_srat), id,
400                                             handler, max_entries);
401 }
402
403 int __init acpi_numa_init(void)
404 {
405         int cnt = 0;
406
407         /*
408          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
409          * SRAT cpu entries could have different order with that in MADT.
410          * So go over all cpu entries in SRAT to get apicid to node mapping.
411          */
412
413         /* SRAT: Static Resource Affinity Table */
414         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
415                 struct acpi_subtable_proc srat_proc[2];
416
417                 memset(srat_proc, 0, sizeof(srat_proc));
418                 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
419                 srat_proc[0].handler = acpi_parse_processor_affinity;
420                 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
421                 srat_proc[1].handler = acpi_parse_x2apic_affinity;
422
423                 acpi_table_parse_entries_array(ACPI_SIG_SRAT,
424                                         sizeof(struct acpi_table_srat),
425                                         srat_proc, ARRAY_SIZE(srat_proc), 0);
426
427                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
428                                             acpi_parse_memory_affinity,
429                                             NR_NODE_MEMBLKS);
430         }
431
432         /* SLIT: System Locality Information Table */
433         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
434
435         if (cnt < 0)
436                 return cnt;
437         else if (!parsed_numa_memblks)
438                 return -ENOENT;
439         return 0;
440 }
441
442 static int acpi_get_pxm(acpi_handle h)
443 {
444         unsigned long long pxm;
445         acpi_status status;
446         acpi_handle handle;
447         acpi_handle phandle = h;
448
449         do {
450                 handle = phandle;
451                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
452                 if (ACPI_SUCCESS(status))
453                         return pxm;
454                 status = acpi_get_parent(handle, &phandle);
455         } while (ACPI_SUCCESS(status));
456         return -1;
457 }
458
459 int acpi_get_node(acpi_handle handle)
460 {
461         int pxm;
462
463         pxm = acpi_get_pxm(handle);
464
465         return acpi_map_pxm_to_node(pxm);
466 }
467 EXPORT_SYMBOL(acpi_get_node);