1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * acpi_numa.c - ACPI NUMA support
4 *
5 * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
6 */
7
8 #define pr_fmt(fmt) "ACPI: " fmt
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/acpi.h>
16 #include <linux/memblock.h>
17 #include <linux/numa.h>
18 #include <linux/nodemask.h>
19 #include <linux/topology.h>
20
21 static nodemask_t nodes_found_map = NODE_MASK_NONE;
22
23 /* maps to convert between proximity domain and logical node ID */
24 static int pxm_to_node_map[MAX_PXM_DOMAINS]
25 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
26 static int node_to_pxm_map[MAX_NUMNODES]
27 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
28
29 unsigned char acpi_srat_revision __initdata;
30 static int acpi_numa __initdata;
31
32 static int last_real_pxm;
33
disable_srat(void)34 void __init disable_srat(void)
35 {
36 acpi_numa = -1;
37 }
38
pxm_to_node(int pxm)39 int pxm_to_node(int pxm)
40 {
41 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
42 return NUMA_NO_NODE;
43 return pxm_to_node_map[pxm];
44 }
45 EXPORT_SYMBOL(pxm_to_node);
46
node_to_pxm(int node)47 int node_to_pxm(int node)
48 {
49 if (node < 0)
50 return PXM_INVAL;
51 return node_to_pxm_map[node];
52 }
53
__acpi_map_pxm_to_node(int pxm,int node)54 static void __acpi_map_pxm_to_node(int pxm, int node)
55 {
56 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
57 pxm_to_node_map[pxm] = node;
58 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
59 node_to_pxm_map[node] = pxm;
60 }
61
acpi_map_pxm_to_node(int pxm)62 int acpi_map_pxm_to_node(int pxm)
63 {
64 int node;
65
66 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
67 return NUMA_NO_NODE;
68
69 node = pxm_to_node_map[pxm];
70
71 if (node == NUMA_NO_NODE) {
72 node = first_unset_node(nodes_found_map);
73 if (node >= MAX_NUMNODES)
74 return NUMA_NO_NODE;
75 __acpi_map_pxm_to_node(pxm, node);
76 node_set(node, nodes_found_map);
77 }
78
79 return node;
80 }
81 EXPORT_SYMBOL(acpi_map_pxm_to_node);
82
83 static void __init
acpi_table_print_srat_entry(struct acpi_subtable_header * header)84 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
85 {
86 switch (header->type) {
87 case ACPI_SRAT_TYPE_CPU_AFFINITY:
88 {
89 struct acpi_srat_cpu_affinity *p =
90 (struct acpi_srat_cpu_affinity *)header;
91 pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
92 p->apic_id, p->local_sapic_eid,
93 p->proximity_domain_lo,
94 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
95 "enabled" : "disabled");
96 }
97 break;
98
99 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
100 {
101 struct acpi_srat_mem_affinity *p =
102 (struct acpi_srat_mem_affinity *)header;
103 pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n",
104 (unsigned long long)p->base_address,
105 (unsigned long long)p->length,
106 p->proximity_domain,
107 (p->flags & ACPI_SRAT_MEM_ENABLED) ?
108 "enabled" : "disabled",
109 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
110 " hot-pluggable" : "",
111 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ?
112 " non-volatile" : "");
113 }
114 break;
115
116 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
117 {
118 struct acpi_srat_x2apic_cpu_affinity *p =
119 (struct acpi_srat_x2apic_cpu_affinity *)header;
120 pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n",
121 p->apic_id,
122 p->proximity_domain,
123 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
124 "enabled" : "disabled");
125 }
126 break;
127
128 case ACPI_SRAT_TYPE_GICC_AFFINITY:
129 {
130 struct acpi_srat_gicc_affinity *p =
131 (struct acpi_srat_gicc_affinity *)header;
132 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",
133 p->acpi_processor_uid,
134 p->proximity_domain,
135 (p->flags & ACPI_SRAT_GICC_ENABLED) ?
136 "enabled" : "disabled");
137 }
138 break;
139
140 case ACPI_SRAT_TYPE_GENERIC_AFFINITY:
141 {
142 struct acpi_srat_generic_affinity *p =
143 (struct acpi_srat_generic_affinity *)header;
144
145 if (p->device_handle_type == 0) {
146 /*
147 * For pci devices this may be the only place they
148 * are assigned a proximity domain
149 */
150 pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n",
151 *(u16 *)(&p->device_handle[0]),
152 *(u16 *)(&p->device_handle[2]),
153 p->proximity_domain,
154 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
155 "enabled" : "disabled");
156 } else {
157 /*
158 * In this case we can rely on the device having a
159 * proximity domain reference
160 */
161 pr_debug("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n",
162 (char *)(&p->device_handle[0]),
163 (char *)(&p->device_handle[8]),
164 p->proximity_domain,
165 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
166 "enabled" : "disabled");
167 }
168 }
169 break;
170 default:
171 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",
172 header->type);
173 break;
174 }
175 }
176
177 /*
178 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
179 * up the NUMA heuristics which wants the local node to have a smaller
180 * distance than the others.
181 * Do some quick checks here and only use the SLIT if it passes.
182 */
slit_valid(struct acpi_table_slit * slit)183 static int __init slit_valid(struct acpi_table_slit *slit)
184 {
185 int i, j;
186 int d = slit->locality_count;
187 for (i = 0; i < d; i++) {
188 for (j = 0; j < d; j++) {
189 u8 val = slit->entry[d*i + j];
190 if (i == j) {
191 if (val != LOCAL_DISTANCE)
192 return 0;
193 } else if (val <= LOCAL_DISTANCE)
194 return 0;
195 }
196 }
197 return 1;
198 }
199
bad_srat(void)200 void __init bad_srat(void)
201 {
202 pr_err("SRAT: SRAT not used.\n");
203 disable_srat();
204 }
205
srat_disabled(void)206 int __init srat_disabled(void)
207 {
208 return acpi_numa < 0;
209 }
210
numa_fill_memblks(u64 start,u64 end)211 __weak int __init numa_fill_memblks(u64 start, u64 end)
212 {
213 return NUMA_NO_MEMBLK;
214 }
215
216 /*
217 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
218 * I/O localities since SRAT does not list them. I/O localities are
219 * not supported at this point.
220 */
acpi_parse_slit(struct acpi_table_header * table)221 static int __init acpi_parse_slit(struct acpi_table_header *table)
222 {
223 struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
224 int i, j;
225
226 if (!slit_valid(slit)) {
227 pr_info("SLIT table looks invalid. Not used.\n");
228 return -EINVAL;
229 }
230
231 for (i = 0; i < slit->locality_count; i++) {
232 const int from_node = pxm_to_node(i);
233
234 if (from_node == NUMA_NO_NODE)
235 continue;
236
237 for (j = 0; j < slit->locality_count; j++) {
238 const int to_node = pxm_to_node(j);
239
240 if (to_node == NUMA_NO_NODE)
241 continue;
242
243 numa_set_distance(from_node, to_node,
244 slit->entry[slit->locality_count * i + j]);
245 }
246 }
247
248 return 0;
249 }
250
251 static int parsed_numa_memblks __initdata;
252
253 static int __init
acpi_parse_memory_affinity(union acpi_subtable_headers * header,const unsigned long table_end)254 acpi_parse_memory_affinity(union acpi_subtable_headers *header,
255 const unsigned long table_end)
256 {
257 struct acpi_srat_mem_affinity *ma;
258 u64 start, end;
259 u32 hotpluggable;
260 int node, pxm;
261
262 ma = (struct acpi_srat_mem_affinity *)header;
263
264 acpi_table_print_srat_entry(&header->common);
265
266 if (srat_disabled())
267 return 0;
268 if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {
269 pr_err("SRAT: Unexpected header length: %d\n",
270 ma->header.length);
271 goto out_err_bad_srat;
272 }
273 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
274 return 0;
275 hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&
276 (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE);
277
278 start = ma->base_address;
279 end = start + ma->length;
280 pxm = ma->proximity_domain;
281 if (acpi_srat_revision <= 1)
282 pxm &= 0xff;
283
284 node = acpi_map_pxm_to_node(pxm);
285 if (node == NUMA_NO_NODE) {
286 pr_err("SRAT: Too many proximity domains.\n");
287 goto out_err_bad_srat;
288 }
289
290 if (numa_add_memblk(node, start, end) < 0) {
291 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n",
292 node, (unsigned long long) start,
293 (unsigned long long) end - 1);
294 goto out_err_bad_srat;
295 }
296
297 node_set(node, numa_nodes_parsed);
298
299 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",
300 node, pxm,
301 (unsigned long long) start, (unsigned long long) end - 1,
302 hotpluggable ? " hotplug" : "",
303 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");
304
305 /* Mark hotplug range in memblock. */
306 if (hotpluggable && memblock_mark_hotplug(start, ma->length))
307 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
308 (unsigned long long)start, (unsigned long long)end - 1);
309
310 max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
311
312 parsed_numa_memblks++;
313
314 return 0;
315
316 out_err_bad_srat:
317 /* Just disable SRAT, but do not fail and ignore errors. */
318 bad_srat();
319
320 return 0;
321 }
322
acpi_parse_cfmws(union acpi_subtable_headers * header,void * arg,const unsigned long table_end)323 static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
324 void *arg, const unsigned long table_end)
325 {
326 struct acpi_cedt_cfmws *cfmws;
327 int *fake_pxm = arg;
328 u64 start, end;
329 int node;
330
331 cfmws = (struct acpi_cedt_cfmws *)header;
332 start = cfmws->base_hpa;
333 end = cfmws->base_hpa + cfmws->window_size;
334
335 /*
336 * The SRAT may have already described NUMA details for all,
337 * or a portion of, this CFMWS HPA range. Extend the memblks
338 * found for any portion of the window to cover the entire
339 * window.
340 */
341 if (!numa_fill_memblks(start, end))
342 return 0;
343
344 /* No SRAT description. Create a new node. */
345 node = acpi_map_pxm_to_node(*fake_pxm);
346
347 if (node == NUMA_NO_NODE) {
348 pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n");
349 return -EINVAL;
350 }
351
352 if (numa_add_memblk(node, start, end) < 0) {
353 /* CXL driver must handle the NUMA_NO_NODE case */
354 pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n",
355 node, start, end);
356 }
357 node_set(node, numa_nodes_parsed);
358
359 /* Set the next available fake_pxm value */
360 (*fake_pxm)++;
361 return 0;
362 }
363
364 void __init __weak
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity * pa)365 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
366 {
367 pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
368 }
369
370 static int __init
acpi_parse_x2apic_affinity(union acpi_subtable_headers * header,const unsigned long end)371 acpi_parse_x2apic_affinity(union acpi_subtable_headers *header,
372 const unsigned long end)
373 {
374 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
375
376 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
377
378 acpi_table_print_srat_entry(&header->common);
379
380 /* let architecture-dependent part to do it */
381 acpi_numa_x2apic_affinity_init(processor_affinity);
382
383 return 0;
384 }
385
386 static int __init
acpi_parse_processor_affinity(union acpi_subtable_headers * header,const unsigned long end)387 acpi_parse_processor_affinity(union acpi_subtable_headers *header,
388 const unsigned long end)
389 {
390 struct acpi_srat_cpu_affinity *processor_affinity;
391
392 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
393
394 acpi_table_print_srat_entry(&header->common);
395
396 /* let architecture-dependent part to do it */
397 acpi_numa_processor_affinity_init(processor_affinity);
398
399 return 0;
400 }
401
402 static int __init
acpi_parse_gicc_affinity(union acpi_subtable_headers * header,const unsigned long end)403 acpi_parse_gicc_affinity(union acpi_subtable_headers *header,
404 const unsigned long end)
405 {
406 struct acpi_srat_gicc_affinity *processor_affinity;
407
408 processor_affinity = (struct acpi_srat_gicc_affinity *)header;
409
410 acpi_table_print_srat_entry(&header->common);
411
412 /* let architecture-dependent part to do it */
413 acpi_numa_gicc_affinity_init(processor_affinity);
414
415 return 0;
416 }
417
418 #if defined(CONFIG_X86) || defined(CONFIG_ARM64)
419 static int __init
acpi_parse_gi_affinity(union acpi_subtable_headers * header,const unsigned long end)420 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
421 const unsigned long end)
422 {
423 struct acpi_srat_generic_affinity *gi_affinity;
424 int node;
425
426 gi_affinity = (struct acpi_srat_generic_affinity *)header;
427 if (!gi_affinity)
428 return -EINVAL;
429 acpi_table_print_srat_entry(&header->common);
430
431 if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED))
432 return -EINVAL;
433
434 node = acpi_map_pxm_to_node(gi_affinity->proximity_domain);
435 if (node == NUMA_NO_NODE) {
436 pr_err("SRAT: Too many proximity domains.\n");
437 return -EINVAL;
438 }
439 node_set(node, numa_nodes_parsed);
440 node_set_state(node, N_GENERIC_INITIATOR);
441
442 return 0;
443 }
444 #else
445 static int __init
acpi_parse_gi_affinity(union acpi_subtable_headers * header,const unsigned long end)446 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
447 const unsigned long end)
448 {
449 return 0;
450 }
451 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
452
acpi_parse_srat(struct acpi_table_header * table)453 static int __init acpi_parse_srat(struct acpi_table_header *table)
454 {
455 struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
456
457 acpi_srat_revision = srat->header.revision;
458
459 /* Real work done in acpi_table_parse_srat below. */
460
461 return 0;
462 }
463
464 static int __init
acpi_table_parse_srat(enum acpi_srat_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)465 acpi_table_parse_srat(enum acpi_srat_type id,
466 acpi_tbl_entry_handler handler, unsigned int max_entries)
467 {
468 return acpi_table_parse_entries(ACPI_SIG_SRAT,
469 sizeof(struct acpi_table_srat), id,
470 handler, max_entries);
471 }
472
acpi_numa_init(void)473 int __init acpi_numa_init(void)
474 {
475 int i, fake_pxm, cnt = 0;
476
477 if (acpi_disabled)
478 return -EINVAL;
479
480 /*
481 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
482 * SRAT cpu entries could have different order with that in MADT.
483 * So go over all cpu entries in SRAT to get apicid to node mapping.
484 */
485
486 /* SRAT: System Resource Affinity Table */
487 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
488 struct acpi_subtable_proc srat_proc[4];
489
490 memset(srat_proc, 0, sizeof(srat_proc));
491 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
492 srat_proc[0].handler = acpi_parse_processor_affinity;
493 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
494 srat_proc[1].handler = acpi_parse_x2apic_affinity;
495 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
496 srat_proc[2].handler = acpi_parse_gicc_affinity;
497 srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY;
498 srat_proc[3].handler = acpi_parse_gi_affinity;
499
500 acpi_table_parse_entries_array(ACPI_SIG_SRAT,
501 sizeof(struct acpi_table_srat),
502 srat_proc, ARRAY_SIZE(srat_proc), 0);
503
504 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
505 acpi_parse_memory_affinity, 0);
506 }
507
508 /* SLIT: System Locality Information Table */
509 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
510
511 /*
512 * CXL Fixed Memory Window Structures (CFMWS) must be parsed
513 * after the SRAT. Create NUMA Nodes for CXL memory ranges that
514 * are defined in the CFMWS and not already defined in the SRAT.
515 * Initialize a fake_pxm as the first available PXM to emulate.
516 */
517
518 /* fake_pxm is the next unused PXM value after SRAT parsing */
519 for (i = 0, fake_pxm = -1; i < MAX_NUMNODES; i++) {
520 if (node_to_pxm_map[i] > fake_pxm)
521 fake_pxm = node_to_pxm_map[i];
522 }
523 last_real_pxm = fake_pxm;
524 fake_pxm++;
525 acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,
526 &fake_pxm);
527
528 if (cnt < 0)
529 return cnt;
530 else if (!parsed_numa_memblks)
531 return -ENOENT;
532 return 0;
533 }
534
acpi_node_backed_by_real_pxm(int nid)535 bool acpi_node_backed_by_real_pxm(int nid)
536 {
537 int pxm = node_to_pxm(nid);
538
539 return pxm <= last_real_pxm;
540 }
541 EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm);
542
acpi_get_pxm(acpi_handle h)543 static int acpi_get_pxm(acpi_handle h)
544 {
545 unsigned long long pxm;
546 acpi_status status;
547 acpi_handle handle;
548 acpi_handle phandle = h;
549
550 do {
551 handle = phandle;
552 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
553 if (ACPI_SUCCESS(status))
554 return pxm;
555 status = acpi_get_parent(handle, &phandle);
556 } while (ACPI_SUCCESS(status));
557 return -1;
558 }
559
acpi_get_node(acpi_handle handle)560 int acpi_get_node(acpi_handle handle)
561 {
562 int pxm;
563
564 pxm = acpi_get_pxm(handle);
565
566 return pxm_to_node(pxm);
567 }
568 EXPORT_SYMBOL(acpi_get_node);
569