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 #include <linux/numa_memblks.h>
21
22 static nodemask_t nodes_found_map = NODE_MASK_NONE;
23
24 /* maps to convert between proximity domain and logical node ID */
25 static int pxm_to_node_map[MAX_PXM_DOMAINS]
26 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
27 static int node_to_pxm_map[MAX_NUMNODES]
28 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
29
30 unsigned char acpi_srat_revision __initdata;
31 static int acpi_numa __initdata;
32
33 static int last_real_pxm;
34
disable_srat(void)35 void __init disable_srat(void)
36 {
37 acpi_numa = -1;
38 }
39
pxm_to_node(int pxm)40 int pxm_to_node(int pxm)
41 {
42 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
43 return NUMA_NO_NODE;
44 return pxm_to_node_map[pxm];
45 }
46 EXPORT_SYMBOL(pxm_to_node);
47
node_to_pxm(int node)48 int node_to_pxm(int node)
49 {
50 if (node < 0)
51 return PXM_INVAL;
52 return node_to_pxm_map[node];
53 }
54 EXPORT_SYMBOL_GPL(node_to_pxm);
55
__acpi_map_pxm_to_node(int pxm,int node)56 static void __acpi_map_pxm_to_node(int pxm, int node)
57 {
58 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
59 pxm_to_node_map[pxm] = node;
60 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
61 node_to_pxm_map[node] = pxm;
62 }
63
acpi_map_pxm_to_node(int pxm)64 int acpi_map_pxm_to_node(int pxm)
65 {
66 int node;
67
68 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
69 return NUMA_NO_NODE;
70
71 node = pxm_to_node_map[pxm];
72
73 if (node == NUMA_NO_NODE) {
74 node = first_unset_node(nodes_found_map);
75 if (node >= MAX_NUMNODES)
76 return NUMA_NO_NODE;
77 __acpi_map_pxm_to_node(pxm, node);
78 node_set(node, nodes_found_map);
79 }
80
81 return node;
82 }
83 EXPORT_SYMBOL(acpi_map_pxm_to_node);
84
85 #ifdef CONFIG_NUMA_EMU
86 /*
87 * Take max_nid - 1 fake-numa nodes into account in both
88 * pxm_to_node_map()/node_to_pxm_map[] tables.
89 */
fix_pxm_node_maps(int max_nid)90 int __init fix_pxm_node_maps(int max_nid)
91 {
92 static int pxm_to_node_map_copy[MAX_PXM_DOMAINS] __initdata
93 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
94 static int node_to_pxm_map_copy[MAX_NUMNODES] __initdata
95 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
96 int i, j, index = -1, count = 0;
97 nodemask_t nodes_to_enable;
98
99 if (numa_off)
100 return -1;
101
102 /* no or incomplete node/PXM mapping set, nothing to do */
103 if (srat_disabled())
104 return 0;
105
106 /* find fake nodes PXM mapping */
107 for (i = 0; i < MAX_NUMNODES; i++) {
108 if (node_to_pxm_map[i] != PXM_INVAL) {
109 for (j = 0; j <= max_nid; j++) {
110 if ((emu_nid_to_phys[j] == i) &&
111 WARN(node_to_pxm_map_copy[j] != PXM_INVAL,
112 "Node %d is already binded to PXM %d\n",
113 j, node_to_pxm_map_copy[j]))
114 return -1;
115 if (emu_nid_to_phys[j] == i) {
116 node_to_pxm_map_copy[j] =
117 node_to_pxm_map[i];
118 if (j > index)
119 index = j;
120 count++;
121 }
122 }
123 }
124 }
125 if (index == -1) {
126 pr_debug("No node/PXM mapping has been set\n");
127 /* nothing more to be done */
128 return 0;
129 }
130 if (WARN(index != max_nid, "%d max nid when expected %d\n",
131 index, max_nid))
132 return -1;
133
134 nodes_clear(nodes_to_enable);
135
136 /* map phys nodes not used for fake nodes */
137 for (i = 0; i < MAX_NUMNODES; i++) {
138 if (node_to_pxm_map[i] != PXM_INVAL) {
139 for (j = 0; j <= max_nid; j++)
140 if (emu_nid_to_phys[j] == i)
141 break;
142 /* fake nodes PXM mapping has been done */
143 if (j <= max_nid)
144 continue;
145 /* find first hole */
146 for (j = 0;
147 j < MAX_NUMNODES &&
148 node_to_pxm_map_copy[j] != PXM_INVAL;
149 j++)
150 ;
151 if (WARN(j == MAX_NUMNODES,
152 "Number of nodes exceeds MAX_NUMNODES\n"))
153 return -1;
154 node_to_pxm_map_copy[j] = node_to_pxm_map[i];
155 node_set(j, nodes_to_enable);
156 count++;
157 }
158 }
159
160 /* creating reverse mapping in pxm_to_node_map[] */
161 for (i = 0; i < MAX_NUMNODES; i++)
162 if (node_to_pxm_map_copy[i] != PXM_INVAL &&
163 pxm_to_node_map_copy[node_to_pxm_map_copy[i]] == NUMA_NO_NODE)
164 pxm_to_node_map_copy[node_to_pxm_map_copy[i]] = i;
165
166 /* overwrite with new mapping */
167 for (i = 0; i < MAX_NUMNODES; i++) {
168 node_to_pxm_map[i] = node_to_pxm_map_copy[i];
169 pxm_to_node_map[i] = pxm_to_node_map_copy[i];
170 }
171
172 /* enable other nodes found in PXM for hotplug */
173 nodes_or(numa_nodes_parsed, nodes_to_enable, numa_nodes_parsed);
174
175 pr_debug("found %d total number of nodes\n", count);
176 return 0;
177 }
178 #endif
179
180 static void __init
acpi_table_print_srat_entry(struct acpi_subtable_header * header)181 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
182 {
183 switch (header->type) {
184 case ACPI_SRAT_TYPE_CPU_AFFINITY:
185 {
186 struct acpi_srat_cpu_affinity *p =
187 (struct acpi_srat_cpu_affinity *)header;
188 pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
189 p->apic_id, p->local_sapic_eid,
190 p->proximity_domain_lo,
191 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
192 "enabled" : "disabled");
193 }
194 break;
195
196 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
197 {
198 struct acpi_srat_mem_affinity *p =
199 (struct acpi_srat_mem_affinity *)header;
200 pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n",
201 (unsigned long long)p->base_address,
202 (unsigned long long)p->length,
203 p->proximity_domain,
204 (p->flags & ACPI_SRAT_MEM_ENABLED) ?
205 "enabled" : "disabled",
206 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
207 " hot-pluggable" : "",
208 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ?
209 " non-volatile" : "");
210 }
211 break;
212
213 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
214 {
215 struct acpi_srat_x2apic_cpu_affinity *p =
216 (struct acpi_srat_x2apic_cpu_affinity *)header;
217 pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n",
218 p->apic_id,
219 p->proximity_domain,
220 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
221 "enabled" : "disabled");
222 }
223 break;
224
225 case ACPI_SRAT_TYPE_GICC_AFFINITY:
226 {
227 struct acpi_srat_gicc_affinity *p =
228 (struct acpi_srat_gicc_affinity *)header;
229 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",
230 p->acpi_processor_uid,
231 p->proximity_domain,
232 (p->flags & ACPI_SRAT_GICC_ENABLED) ?
233 "enabled" : "disabled");
234 }
235 break;
236
237 case ACPI_SRAT_TYPE_GENERIC_AFFINITY:
238 {
239 struct acpi_srat_generic_affinity *p =
240 (struct acpi_srat_generic_affinity *)header;
241
242 if (p->device_handle_type == 0) {
243 /*
244 * For pci devices this may be the only place they
245 * are assigned a proximity domain
246 */
247 pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n",
248 *(u16 *)(&p->device_handle[0]),
249 *(u16 *)(&p->device_handle[2]),
250 p->proximity_domain,
251 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
252 "enabled" : "disabled");
253 } else {
254 /*
255 * In this case we can rely on the device having a
256 * proximity domain reference
257 */
258 pr_debug("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n",
259 (char *)(&p->device_handle[0]),
260 (char *)(&p->device_handle[8]),
261 p->proximity_domain,
262 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
263 "enabled" : "disabled");
264 }
265 }
266 break;
267
268 case ACPI_SRAT_TYPE_RINTC_AFFINITY:
269 {
270 struct acpi_srat_rintc_affinity *p =
271 (struct acpi_srat_rintc_affinity *)header;
272 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",
273 p->acpi_processor_uid,
274 p->proximity_domain,
275 (p->flags & ACPI_SRAT_RINTC_ENABLED) ?
276 "enabled" : "disabled");
277 }
278 break;
279
280 default:
281 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",
282 header->type);
283 break;
284 }
285 }
286
287 /*
288 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
289 * up the NUMA heuristics which wants the local node to have a smaller
290 * distance than the others.
291 * Do some quick checks here and only use the SLIT if it passes.
292 */
slit_valid(struct acpi_table_slit * slit)293 static int __init slit_valid(struct acpi_table_slit *slit)
294 {
295 int i, j;
296 int d = slit->locality_count;
297 for (i = 0; i < d; i++) {
298 for (j = 0; j < d; j++) {
299 u8 val = slit->entry[d*i + j];
300 if (i == j) {
301 if (val != LOCAL_DISTANCE)
302 return 0;
303 } else if (val <= LOCAL_DISTANCE)
304 return 0;
305 }
306 }
307 return 1;
308 }
309
bad_srat(void)310 void __init bad_srat(void)
311 {
312 pr_err("SRAT: SRAT not used.\n");
313 disable_srat();
314 }
315
srat_disabled(void)316 int __init srat_disabled(void)
317 {
318 return acpi_numa < 0;
319 }
320
numa_fill_memblks(u64 start,u64 end)321 __weak int __init numa_fill_memblks(u64 start, u64 end)
322 {
323 return NUMA_NO_MEMBLK;
324 }
325
326 /*
327 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
328 * I/O localities since SRAT does not list them. I/O localities are
329 * not supported at this point.
330 */
acpi_parse_slit(struct acpi_table_header * table)331 static int __init acpi_parse_slit(struct acpi_table_header *table)
332 {
333 struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
334 int i, j;
335
336 if (!slit_valid(slit)) {
337 pr_info("SLIT table looks invalid. Not used.\n");
338 return -EINVAL;
339 }
340
341 for (i = 0; i < slit->locality_count; i++) {
342 const int from_node = pxm_to_node(i);
343
344 if (from_node == NUMA_NO_NODE)
345 continue;
346
347 for (j = 0; j < slit->locality_count; j++) {
348 const int to_node = pxm_to_node(j);
349
350 if (to_node == NUMA_NO_NODE)
351 continue;
352
353 numa_set_distance(from_node, to_node,
354 slit->entry[slit->locality_count * i + j]);
355 }
356 }
357
358 return 0;
359 }
360
361 static int parsed_numa_memblks __initdata;
362
363 static int __init
acpi_parse_memory_affinity(union acpi_subtable_headers * header,const unsigned long table_end)364 acpi_parse_memory_affinity(union acpi_subtable_headers *header,
365 const unsigned long table_end)
366 {
367 struct acpi_srat_mem_affinity *ma;
368 u64 start, end;
369 u32 hotpluggable;
370 int node, pxm;
371
372 ma = (struct acpi_srat_mem_affinity *)header;
373
374 acpi_table_print_srat_entry(&header->common);
375
376 if (srat_disabled())
377 return 0;
378 if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {
379 pr_err("SRAT: Unexpected header length: %d\n",
380 ma->header.length);
381 goto out_err_bad_srat;
382 }
383 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
384 return 0;
385 hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&
386 (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE);
387
388 start = ma->base_address;
389 end = start + ma->length;
390 pxm = ma->proximity_domain;
391 if (acpi_srat_revision <= 1)
392 pxm &= 0xff;
393
394 node = acpi_map_pxm_to_node(pxm);
395 if (node == NUMA_NO_NODE) {
396 pr_err("SRAT: Too many proximity domains.\n");
397 goto out_err_bad_srat;
398 }
399
400 if (numa_add_memblk(node, start, end) < 0) {
401 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n",
402 node, (unsigned long long) start,
403 (unsigned long long) end - 1);
404 goto out_err_bad_srat;
405 }
406
407 node_set(node, numa_nodes_parsed);
408
409 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",
410 node, pxm,
411 (unsigned long long) start, (unsigned long long) end - 1,
412 hotpluggable ? " hotplug" : "",
413 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");
414
415 /* Mark hotplug range in memblock. */
416 if (hotpluggable && memblock_mark_hotplug(start, ma->length))
417 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
418 (unsigned long long)start, (unsigned long long)end - 1);
419
420 max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
421
422 parsed_numa_memblks++;
423
424 return 0;
425
426 out_err_bad_srat:
427 /* Just disable SRAT, but do not fail and ignore errors. */
428 bad_srat();
429
430 return 0;
431 }
432
acpi_parse_cfmws(union acpi_subtable_headers * header,void * arg,const unsigned long table_end)433 static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
434 void *arg, const unsigned long table_end)
435 {
436 struct acpi_cedt_cfmws *cfmws;
437 int *fake_pxm = arg;
438 u64 start, end;
439 int node;
440
441 cfmws = (struct acpi_cedt_cfmws *)header;
442 start = cfmws->base_hpa;
443 end = cfmws->base_hpa + cfmws->window_size;
444
445 /*
446 * The SRAT may have already described NUMA details for all,
447 * or a portion of, this CFMWS HPA range. Extend the memblks
448 * found for any portion of the window to cover the entire
449 * window.
450 */
451 if (!numa_fill_memblks(start, end))
452 return 0;
453
454 /* No SRAT description. Create a new node. */
455 node = acpi_map_pxm_to_node(*fake_pxm);
456
457 if (node == NUMA_NO_NODE) {
458 pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n");
459 return -EINVAL;
460 }
461
462 if (numa_add_memblk(node, start, end) < 0) {
463 /* CXL driver must handle the NUMA_NO_NODE case */
464 pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n",
465 node, start, end);
466 }
467 node_set(node, numa_nodes_parsed);
468
469 /* Set the next available fake_pxm value */
470 (*fake_pxm)++;
471 return 0;
472 }
473
474 void __init __weak
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity * pa)475 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
476 {
477 pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
478 }
479
480 static int __init
acpi_parse_x2apic_affinity(union acpi_subtable_headers * header,const unsigned long end)481 acpi_parse_x2apic_affinity(union acpi_subtable_headers *header,
482 const unsigned long end)
483 {
484 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
485
486 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
487
488 acpi_table_print_srat_entry(&header->common);
489
490 /* let architecture-dependent part to do it */
491 acpi_numa_x2apic_affinity_init(processor_affinity);
492
493 return 0;
494 }
495
496 static int __init
acpi_parse_processor_affinity(union acpi_subtable_headers * header,const unsigned long end)497 acpi_parse_processor_affinity(union acpi_subtable_headers *header,
498 const unsigned long end)
499 {
500 struct acpi_srat_cpu_affinity *processor_affinity;
501
502 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
503
504 acpi_table_print_srat_entry(&header->common);
505
506 /* let architecture-dependent part to do it */
507 acpi_numa_processor_affinity_init(processor_affinity);
508
509 return 0;
510 }
511
512 static int __init
acpi_parse_gicc_affinity(union acpi_subtable_headers * header,const unsigned long end)513 acpi_parse_gicc_affinity(union acpi_subtable_headers *header,
514 const unsigned long end)
515 {
516 struct acpi_srat_gicc_affinity *processor_affinity;
517
518 processor_affinity = (struct acpi_srat_gicc_affinity *)header;
519
520 acpi_table_print_srat_entry(&header->common);
521
522 /* let architecture-dependent part to do it */
523 acpi_numa_gicc_affinity_init(processor_affinity);
524
525 return 0;
526 }
527
528 #if defined(CONFIG_X86) || defined(CONFIG_ARM64)
529 static int __init
acpi_parse_gi_affinity(union acpi_subtable_headers * header,const unsigned long end)530 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
531 const unsigned long end)
532 {
533 struct acpi_srat_generic_affinity *gi_affinity;
534 int node;
535
536 gi_affinity = (struct acpi_srat_generic_affinity *)header;
537 if (!gi_affinity)
538 return -EINVAL;
539 acpi_table_print_srat_entry(&header->common);
540
541 if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED))
542 return -EINVAL;
543
544 node = acpi_map_pxm_to_node(gi_affinity->proximity_domain);
545 if (node == NUMA_NO_NODE) {
546 pr_err("SRAT: Too many proximity domains.\n");
547 return -EINVAL;
548 }
549 node_set(node, numa_nodes_parsed);
550 node_set_state(node, N_GENERIC_INITIATOR);
551
552 return 0;
553 }
554 #else
555 static int __init
acpi_parse_gi_affinity(union acpi_subtable_headers * header,const unsigned long end)556 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
557 const unsigned long end)
558 {
559 return 0;
560 }
561 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
562
563 static int __init
acpi_parse_rintc_affinity(union acpi_subtable_headers * header,const unsigned long end)564 acpi_parse_rintc_affinity(union acpi_subtable_headers *header,
565 const unsigned long end)
566 {
567 struct acpi_srat_rintc_affinity *rintc_affinity;
568
569 rintc_affinity = (struct acpi_srat_rintc_affinity *)header;
570 acpi_table_print_srat_entry(&header->common);
571
572 /* let architecture-dependent part to do it */
573 acpi_numa_rintc_affinity_init(rintc_affinity);
574
575 return 0;
576 }
577
acpi_parse_srat(struct acpi_table_header * table)578 static int __init acpi_parse_srat(struct acpi_table_header *table)
579 {
580 struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
581
582 acpi_srat_revision = srat->header.revision;
583
584 /* Real work done in acpi_table_parse_srat below. */
585
586 return 0;
587 }
588
589 static int __init
acpi_table_parse_srat(enum acpi_srat_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)590 acpi_table_parse_srat(enum acpi_srat_type id,
591 acpi_tbl_entry_handler handler, unsigned int max_entries)
592 {
593 return acpi_table_parse_entries(ACPI_SIG_SRAT,
594 sizeof(struct acpi_table_srat), id,
595 handler, max_entries);
596 }
597
acpi_numa_init(void)598 int __init acpi_numa_init(void)
599 {
600 int i, fake_pxm, cnt = 0;
601
602 if (acpi_disabled)
603 return -EINVAL;
604
605 /*
606 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
607 * SRAT cpu entries could have different order with that in MADT.
608 * So go over all cpu entries in SRAT to get apicid to node mapping.
609 */
610
611 /* SRAT: System Resource Affinity Table */
612 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
613 struct acpi_subtable_proc srat_proc[5];
614
615 memset(srat_proc, 0, sizeof(srat_proc));
616 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
617 srat_proc[0].handler = acpi_parse_processor_affinity;
618 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
619 srat_proc[1].handler = acpi_parse_x2apic_affinity;
620 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
621 srat_proc[2].handler = acpi_parse_gicc_affinity;
622 srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY;
623 srat_proc[3].handler = acpi_parse_gi_affinity;
624 srat_proc[4].id = ACPI_SRAT_TYPE_RINTC_AFFINITY;
625 srat_proc[4].handler = acpi_parse_rintc_affinity;
626
627 acpi_table_parse_entries_array(ACPI_SIG_SRAT,
628 sizeof(struct acpi_table_srat),
629 srat_proc, ARRAY_SIZE(srat_proc), 0);
630
631 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
632 acpi_parse_memory_affinity, 0);
633 }
634
635 /* SLIT: System Locality Information Table */
636 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
637
638 /*
639 * CXL Fixed Memory Window Structures (CFMWS) must be parsed
640 * after the SRAT. Create NUMA Nodes for CXL memory ranges that
641 * are defined in the CFMWS and not already defined in the SRAT.
642 * Initialize a fake_pxm as the first available PXM to emulate.
643 */
644
645 /* fake_pxm is the next unused PXM value after SRAT parsing */
646 for (i = 0, fake_pxm = -1; i < MAX_NUMNODES; i++) {
647 if (node_to_pxm_map[i] > fake_pxm)
648 fake_pxm = node_to_pxm_map[i];
649 }
650 last_real_pxm = fake_pxm;
651 fake_pxm++;
652 acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,
653 &fake_pxm);
654
655 if (cnt < 0)
656 return cnt;
657 else if (!parsed_numa_memblks)
658 return -ENOENT;
659 return 0;
660 }
661
acpi_node_backed_by_real_pxm(int nid)662 bool acpi_node_backed_by_real_pxm(int nid)
663 {
664 int pxm = node_to_pxm(nid);
665
666 return pxm <= last_real_pxm;
667 }
668 EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm);
669
acpi_get_pxm(acpi_handle h)670 static int acpi_get_pxm(acpi_handle h)
671 {
672 unsigned long long pxm;
673 acpi_status status;
674 acpi_handle handle;
675 acpi_handle phandle = h;
676
677 do {
678 handle = phandle;
679 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
680 if (ACPI_SUCCESS(status))
681 return pxm;
682 status = acpi_get_parent(handle, &phandle);
683 } while (ACPI_SUCCESS(status));
684 return -1;
685 }
686
acpi_get_node(acpi_handle handle)687 int acpi_get_node(acpi_handle handle)
688 {
689 int pxm;
690
691 pxm = acpi_get_pxm(handle);
692
693 return pxm_to_node(pxm);
694 }
695 EXPORT_SYMBOL(acpi_get_node);
696