1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * pseries Memory Hotplug infrastructure.
4 *
5 * Copyright (C) 2008 Badari Pulavarty, IBM Corporation
6 */
7
8 #define pr_fmt(fmt) "pseries-hotplug-mem: " fmt
9
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/memblock.h>
13 #include <linux/memory.h>
14 #include <linux/memory_hotplug.h>
15 #include <linux/slab.h>
16
17 #include <asm/firmware.h>
18 #include <asm/machdep.h>
19 #include <asm/sparsemem.h>
20 #include <asm/fadump.h>
21 #include <asm/drmem.h>
22 #include "pseries.h"
23
pseries_memory_block_size(void)24 unsigned long pseries_memory_block_size(void)
25 {
26 struct device_node *np;
27 u64 memblock_size = MIN_MEMORY_BLOCK_SIZE;
28 struct resource r;
29
30 np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
31 if (np) {
32 int len;
33 int size_cells;
34 const __be32 *prop;
35
36 size_cells = of_n_size_cells(np);
37
38 prop = of_get_property(np, "ibm,lmb-size", &len);
39 if (prop && len >= size_cells * sizeof(__be32))
40 memblock_size = of_read_number(prop, size_cells);
41 of_node_put(np);
42
43 } else if (machine_is(pseries)) {
44 /* This fallback really only applies to pseries */
45 unsigned int memzero_size = 0;
46
47 np = of_find_node_by_path("/memory@0");
48 if (np) {
49 if (!of_address_to_resource(np, 0, &r))
50 memzero_size = resource_size(&r);
51 of_node_put(np);
52 }
53
54 if (memzero_size) {
55 /* We now know the size of memory@0, use this to find
56 * the first memoryblock and get its size.
57 */
58 char buf[64];
59
60 sprintf(buf, "/memory@%x", memzero_size);
61 np = of_find_node_by_path(buf);
62 if (np) {
63 if (!of_address_to_resource(np, 0, &r))
64 memblock_size = resource_size(&r);
65 of_node_put(np);
66 }
67 }
68 }
69 return memblock_size;
70 }
71
dlpar_free_property(struct property * prop)72 static void dlpar_free_property(struct property *prop)
73 {
74 kfree(prop->name);
75 kfree(prop->value);
76 kfree(prop);
77 }
78
dlpar_clone_property(struct property * prop,u32 prop_size)79 static struct property *dlpar_clone_property(struct property *prop,
80 u32 prop_size)
81 {
82 struct property *new_prop;
83
84 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
85 if (!new_prop)
86 return NULL;
87
88 new_prop->name = kstrdup(prop->name, GFP_KERNEL);
89 new_prop->value = kzalloc(prop_size, GFP_KERNEL);
90 if (!new_prop->name || !new_prop->value) {
91 dlpar_free_property(new_prop);
92 return NULL;
93 }
94
95 memcpy(new_prop->value, prop->value, prop->length);
96 new_prop->length = prop_size;
97
98 of_property_set_flag(new_prop, OF_DYNAMIC);
99 return new_prop;
100 }
101
find_aa_index(struct device_node * dr_node,struct property * ala_prop,const u32 * lmb_assoc,u32 * aa_index)102 static bool find_aa_index(struct device_node *dr_node,
103 struct property *ala_prop,
104 const u32 *lmb_assoc, u32 *aa_index)
105 {
106 u32 *assoc_arrays, new_prop_size;
107 struct property *new_prop;
108 int aa_arrays, aa_array_entries, aa_array_sz;
109 int i, index;
110
111 /*
112 * The ibm,associativity-lookup-arrays property is defined to be
113 * a 32-bit value specifying the number of associativity arrays
114 * followed by a 32-bitvalue specifying the number of entries per
115 * array, followed by the associativity arrays.
116 */
117 assoc_arrays = ala_prop->value;
118
119 aa_arrays = be32_to_cpu(assoc_arrays[0]);
120 aa_array_entries = be32_to_cpu(assoc_arrays[1]);
121 aa_array_sz = aa_array_entries * sizeof(u32);
122
123 for (i = 0; i < aa_arrays; i++) {
124 index = (i * aa_array_entries) + 2;
125
126 if (memcmp(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz))
127 continue;
128
129 *aa_index = i;
130 return true;
131 }
132
133 new_prop_size = ala_prop->length + aa_array_sz;
134 new_prop = dlpar_clone_property(ala_prop, new_prop_size);
135 if (!new_prop)
136 return false;
137
138 assoc_arrays = new_prop->value;
139
140 /* increment the number of entries in the lookup array */
141 assoc_arrays[0] = cpu_to_be32(aa_arrays + 1);
142
143 /* copy the new associativity into the lookup array */
144 index = aa_arrays * aa_array_entries + 2;
145 memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz);
146
147 of_update_property(dr_node, new_prop);
148
149 /*
150 * The associativity lookup array index for this lmb is
151 * number of entries - 1 since we added its associativity
152 * to the end of the lookup array.
153 */
154 *aa_index = be32_to_cpu(assoc_arrays[0]) - 1;
155 return true;
156 }
157
update_lmb_associativity_index(struct drmem_lmb * lmb)158 static int update_lmb_associativity_index(struct drmem_lmb *lmb)
159 {
160 struct device_node *parent, *lmb_node, *dr_node;
161 struct property *ala_prop;
162 const u32 *lmb_assoc;
163 u32 aa_index;
164 bool found;
165
166 parent = of_find_node_by_path("/");
167 if (!parent)
168 return -ENODEV;
169
170 lmb_node = dlpar_configure_connector(cpu_to_be32(lmb->drc_index),
171 parent);
172 of_node_put(parent);
173 if (!lmb_node)
174 return -EINVAL;
175
176 lmb_assoc = of_get_property(lmb_node, "ibm,associativity", NULL);
177 if (!lmb_assoc) {
178 dlpar_free_cc_nodes(lmb_node);
179 return -ENODEV;
180 }
181
182 update_numa_distance(lmb_node);
183
184 dr_node = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
185 if (!dr_node) {
186 dlpar_free_cc_nodes(lmb_node);
187 return -ENODEV;
188 }
189
190 ala_prop = of_find_property(dr_node, "ibm,associativity-lookup-arrays",
191 NULL);
192 if (!ala_prop) {
193 of_node_put(dr_node);
194 dlpar_free_cc_nodes(lmb_node);
195 return -ENODEV;
196 }
197
198 found = find_aa_index(dr_node, ala_prop, lmb_assoc, &aa_index);
199
200 of_node_put(dr_node);
201 dlpar_free_cc_nodes(lmb_node);
202
203 if (!found) {
204 pr_err("Could not find LMB associativity\n");
205 return -1;
206 }
207
208 lmb->aa_index = aa_index;
209 return 0;
210 }
211
lmb_to_memblock(struct drmem_lmb * lmb)212 static struct memory_block *lmb_to_memblock(struct drmem_lmb *lmb)
213 {
214 unsigned long section_nr;
215 struct memory_block *mem_block;
216
217 section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr));
218
219 mem_block = find_memory_block(section_nr);
220 return mem_block;
221 }
222
get_lmb_range(u32 drc_index,int n_lmbs,struct drmem_lmb ** start_lmb,struct drmem_lmb ** end_lmb)223 static int get_lmb_range(u32 drc_index, int n_lmbs,
224 struct drmem_lmb **start_lmb,
225 struct drmem_lmb **end_lmb)
226 {
227 struct drmem_lmb *lmb, *start, *end;
228 struct drmem_lmb *limit;
229
230 start = NULL;
231 for_each_drmem_lmb(lmb) {
232 if (lmb->drc_index == drc_index) {
233 start = lmb;
234 break;
235 }
236 }
237
238 if (!start)
239 return -EINVAL;
240
241 end = &start[n_lmbs];
242
243 limit = &drmem_info->lmbs[drmem_info->n_lmbs];
244 if (end > limit)
245 return -EINVAL;
246
247 *start_lmb = start;
248 *end_lmb = end;
249 return 0;
250 }
251
dlpar_change_lmb_state(struct drmem_lmb * lmb,bool online)252 static int dlpar_change_lmb_state(struct drmem_lmb *lmb, bool online)
253 {
254 struct memory_block *mem_block;
255 int rc;
256
257 mem_block = lmb_to_memblock(lmb);
258 if (!mem_block)
259 return -EINVAL;
260
261 if (online && mem_block->dev.offline)
262 rc = device_online(&mem_block->dev);
263 else if (!online && !mem_block->dev.offline)
264 rc = device_offline(&mem_block->dev);
265 else
266 rc = 0;
267
268 put_device(&mem_block->dev);
269
270 return rc;
271 }
272
dlpar_online_lmb(struct drmem_lmb * lmb)273 static int dlpar_online_lmb(struct drmem_lmb *lmb)
274 {
275 return dlpar_change_lmb_state(lmb, true);
276 }
277
278 #ifdef CONFIG_MEMORY_HOTREMOVE
dlpar_offline_lmb(struct drmem_lmb * lmb)279 static int dlpar_offline_lmb(struct drmem_lmb *lmb)
280 {
281 return dlpar_change_lmb_state(lmb, false);
282 }
283
pseries_remove_memblock(unsigned long base,unsigned long memblock_size)284 static int pseries_remove_memblock(unsigned long base, unsigned long memblock_size)
285 {
286 unsigned long block_sz, start_pfn;
287 int sections_per_block;
288 int i;
289
290 start_pfn = base >> PAGE_SHIFT;
291
292 lock_device_hotplug();
293
294 if (!pfn_valid(start_pfn))
295 goto out;
296
297 block_sz = pseries_memory_block_size();
298 sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
299
300 for (i = 0; i < sections_per_block; i++) {
301 __remove_memory(base, MIN_MEMORY_BLOCK_SIZE);
302 base += MIN_MEMORY_BLOCK_SIZE;
303 }
304
305 out:
306 /* Update memory regions for memory remove */
307 memblock_remove(base, memblock_size);
308 unlock_device_hotplug();
309 return 0;
310 }
311
pseries_remove_mem_node(struct device_node * np)312 static int pseries_remove_mem_node(struct device_node *np)
313 {
314 const __be32 *prop;
315 unsigned long base;
316 unsigned long lmb_size;
317 int ret = -EINVAL;
318 int addr_cells, size_cells;
319
320 /*
321 * Check to see if we are actually removing memory
322 */
323 if (!of_node_is_type(np, "memory"))
324 return 0;
325
326 /*
327 * Find the base address and size of the memblock
328 */
329 prop = of_get_property(np, "reg", NULL);
330 if (!prop)
331 return ret;
332
333 addr_cells = of_n_addr_cells(np);
334 size_cells = of_n_size_cells(np);
335
336 /*
337 * "reg" property represents (addr,size) tuple.
338 */
339 base = of_read_number(prop, addr_cells);
340 prop += addr_cells;
341 lmb_size = of_read_number(prop, size_cells);
342
343 pseries_remove_memblock(base, lmb_size);
344 return 0;
345 }
346
lmb_is_removable(struct drmem_lmb * lmb)347 static bool lmb_is_removable(struct drmem_lmb *lmb)
348 {
349 if ((lmb->flags & DRCONF_MEM_RESERVED) ||
350 !(lmb->flags & DRCONF_MEM_ASSIGNED))
351 return false;
352
353 #ifdef CONFIG_FA_DUMP
354 /*
355 * Don't hot-remove memory that falls in fadump boot memory area
356 * and memory that is reserved for capturing old kernel memory.
357 */
358 if (is_fadump_memory_area(lmb->base_addr, memory_block_size_bytes()))
359 return false;
360 #endif
361 /* device_offline() will determine if we can actually remove this lmb */
362 return true;
363 }
364
365 static int dlpar_add_lmb(struct drmem_lmb *);
366
dlpar_remove_lmb(struct drmem_lmb * lmb)367 static int dlpar_remove_lmb(struct drmem_lmb *lmb)
368 {
369 struct memory_block *mem_block;
370 unsigned long block_sz;
371 int rc;
372
373 if (!lmb_is_removable(lmb))
374 return -EINVAL;
375
376 mem_block = lmb_to_memblock(lmb);
377 if (mem_block == NULL)
378 return -EINVAL;
379
380 rc = dlpar_offline_lmb(lmb);
381 if (rc) {
382 put_device(&mem_block->dev);
383 return rc;
384 }
385
386 block_sz = pseries_memory_block_size();
387
388 __remove_memory(lmb->base_addr, block_sz);
389 put_device(&mem_block->dev);
390
391 /* Update memory regions for memory remove */
392 memblock_remove(lmb->base_addr, block_sz);
393
394 invalidate_lmb_associativity_index(lmb);
395 lmb->flags &= ~DRCONF_MEM_ASSIGNED;
396
397 return 0;
398 }
399
dlpar_memory_remove_by_count(u32 lmbs_to_remove)400 static int dlpar_memory_remove_by_count(u32 lmbs_to_remove)
401 {
402 struct drmem_lmb *lmb;
403 int lmbs_reserved = 0;
404 int lmbs_available = 0;
405 int rc;
406
407 pr_info("Attempting to hot-remove %d LMB(s)\n", lmbs_to_remove);
408
409 if (lmbs_to_remove == 0)
410 return -EINVAL;
411
412 /* Validate that there are enough LMBs to satisfy the request */
413 for_each_drmem_lmb(lmb) {
414 if (lmb_is_removable(lmb))
415 lmbs_available++;
416
417 if (lmbs_available == lmbs_to_remove)
418 break;
419 }
420
421 if (lmbs_available < lmbs_to_remove) {
422 pr_info("Not enough LMBs available (%d of %d) to satisfy request\n",
423 lmbs_available, lmbs_to_remove);
424 return -EINVAL;
425 }
426
427 for_each_drmem_lmb(lmb) {
428 rc = dlpar_remove_lmb(lmb);
429 if (rc)
430 continue;
431
432 /* Mark this lmb so we can add it later if all of the
433 * requested LMBs cannot be removed.
434 */
435 drmem_mark_lmb_reserved(lmb);
436
437 lmbs_reserved++;
438 if (lmbs_reserved == lmbs_to_remove)
439 break;
440 }
441
442 if (lmbs_reserved != lmbs_to_remove) {
443 pr_err("Memory hot-remove failed, adding LMB's back\n");
444
445 for_each_drmem_lmb(lmb) {
446 if (!drmem_lmb_reserved(lmb))
447 continue;
448
449 rc = dlpar_add_lmb(lmb);
450 if (rc)
451 pr_err("Failed to add LMB back, drc index %x\n",
452 lmb->drc_index);
453
454 drmem_remove_lmb_reservation(lmb);
455
456 lmbs_reserved--;
457 if (lmbs_reserved == 0)
458 break;
459 }
460
461 rc = -EINVAL;
462 } else {
463 for_each_drmem_lmb(lmb) {
464 if (!drmem_lmb_reserved(lmb))
465 continue;
466
467 dlpar_release_drc(lmb->drc_index);
468 pr_info("Memory at %llx was hot-removed\n",
469 lmb->base_addr);
470
471 drmem_remove_lmb_reservation(lmb);
472
473 lmbs_reserved--;
474 if (lmbs_reserved == 0)
475 break;
476 }
477 rc = 0;
478 }
479
480 return rc;
481 }
482
dlpar_memory_remove_by_index(u32 drc_index)483 static int dlpar_memory_remove_by_index(u32 drc_index)
484 {
485 struct drmem_lmb *lmb;
486 int lmb_found;
487 int rc;
488
489 pr_debug("Attempting to hot-remove LMB, drc index %x\n", drc_index);
490
491 lmb_found = 0;
492 for_each_drmem_lmb(lmb) {
493 if (lmb->drc_index == drc_index) {
494 lmb_found = 1;
495 rc = dlpar_remove_lmb(lmb);
496 if (!rc)
497 dlpar_release_drc(lmb->drc_index);
498
499 break;
500 }
501 }
502
503 if (!lmb_found)
504 rc = -EINVAL;
505
506 if (rc)
507 pr_debug("Failed to hot-remove memory at %llx\n",
508 lmb->base_addr);
509 else
510 pr_debug("Memory at %llx was hot-removed\n", lmb->base_addr);
511
512 return rc;
513 }
514
dlpar_memory_remove_by_ic(u32 lmbs_to_remove,u32 drc_index)515 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
516 {
517 struct drmem_lmb *lmb, *start_lmb, *end_lmb;
518 int rc;
519
520 pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
521 lmbs_to_remove, drc_index);
522
523 if (lmbs_to_remove == 0)
524 return -EINVAL;
525
526 rc = get_lmb_range(drc_index, lmbs_to_remove, &start_lmb, &end_lmb);
527 if (rc)
528 return -EINVAL;
529
530 /*
531 * Validate that all LMBs in range are not reserved. Note that it
532 * is ok if they are !ASSIGNED since our goal here is to remove the
533 * LMB range, regardless of whether some LMBs were already removed
534 * by any other reason.
535 *
536 * This is a contrast to what is done in remove_by_count() where we
537 * check for both RESERVED and !ASSIGNED (via lmb_is_removable()),
538 * because we want to remove a fixed amount of LMBs in that function.
539 */
540 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
541 if (lmb->flags & DRCONF_MEM_RESERVED) {
542 pr_err("Memory at %llx (drc index %x) is reserved\n",
543 lmb->base_addr, lmb->drc_index);
544 return -EINVAL;
545 }
546 }
547
548 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
549 /*
550 * dlpar_remove_lmb() will error out if the LMB is already
551 * !ASSIGNED, but this case is a no-op for us.
552 */
553 if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
554 continue;
555
556 rc = dlpar_remove_lmb(lmb);
557 if (rc)
558 break;
559
560 drmem_mark_lmb_reserved(lmb);
561 }
562
563 if (rc) {
564 pr_err("Memory indexed-count-remove failed, adding any removed LMBs\n");
565
566
567 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
568 if (!drmem_lmb_reserved(lmb))
569 continue;
570
571 /*
572 * Setting the isolation state of an UNISOLATED/CONFIGURED
573 * device to UNISOLATE is a no-op, but the hypervisor can
574 * use it as a hint that the LMB removal failed.
575 */
576 dlpar_unisolate_drc(lmb->drc_index);
577
578 rc = dlpar_add_lmb(lmb);
579 if (rc)
580 pr_err("Failed to add LMB, drc index %x\n",
581 lmb->drc_index);
582
583 drmem_remove_lmb_reservation(lmb);
584 }
585 rc = -EINVAL;
586 } else {
587 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
588 if (!drmem_lmb_reserved(lmb))
589 continue;
590
591 dlpar_release_drc(lmb->drc_index);
592 pr_info("Memory at %llx (drc index %x) was hot-removed\n",
593 lmb->base_addr, lmb->drc_index);
594
595 drmem_remove_lmb_reservation(lmb);
596 }
597 }
598
599 return rc;
600 }
601
602 #else
pseries_remove_memblock(unsigned long base,unsigned long memblock_size)603 static inline int pseries_remove_memblock(unsigned long base,
604 unsigned long memblock_size)
605 {
606 return -EOPNOTSUPP;
607 }
pseries_remove_mem_node(struct device_node * np)608 static inline int pseries_remove_mem_node(struct device_node *np)
609 {
610 return 0;
611 }
dlpar_remove_lmb(struct drmem_lmb * lmb)612 static int dlpar_remove_lmb(struct drmem_lmb *lmb)
613 {
614 return -EOPNOTSUPP;
615 }
dlpar_memory_remove_by_count(u32 lmbs_to_remove)616 static int dlpar_memory_remove_by_count(u32 lmbs_to_remove)
617 {
618 return -EOPNOTSUPP;
619 }
dlpar_memory_remove_by_index(u32 drc_index)620 static int dlpar_memory_remove_by_index(u32 drc_index)
621 {
622 return -EOPNOTSUPP;
623 }
624
dlpar_memory_remove_by_ic(u32 lmbs_to_remove,u32 drc_index)625 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
626 {
627 return -EOPNOTSUPP;
628 }
629 #endif /* CONFIG_MEMORY_HOTREMOVE */
630
dlpar_add_lmb(struct drmem_lmb * lmb)631 static int dlpar_add_lmb(struct drmem_lmb *lmb)
632 {
633 unsigned long block_sz;
634 int nid, rc;
635
636 if (lmb->flags & DRCONF_MEM_ASSIGNED)
637 return -EINVAL;
638
639 rc = update_lmb_associativity_index(lmb);
640 if (rc) {
641 dlpar_release_drc(lmb->drc_index);
642 return rc;
643 }
644
645 block_sz = memory_block_size_bytes();
646
647 /* Find the node id for this LMB. Fake one if necessary. */
648 nid = of_drconf_to_nid_single(lmb);
649 if (nid < 0 || !node_possible(nid))
650 nid = first_online_node;
651
652 /* Add the memory */
653 rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE);
654 if (rc) {
655 invalidate_lmb_associativity_index(lmb);
656 return rc;
657 }
658
659 rc = dlpar_online_lmb(lmb);
660 if (rc) {
661 __remove_memory(lmb->base_addr, block_sz);
662 invalidate_lmb_associativity_index(lmb);
663 } else {
664 lmb->flags |= DRCONF_MEM_ASSIGNED;
665 }
666
667 return rc;
668 }
669
dlpar_memory_add_by_count(u32 lmbs_to_add)670 static int dlpar_memory_add_by_count(u32 lmbs_to_add)
671 {
672 struct drmem_lmb *lmb;
673 int lmbs_available = 0;
674 int lmbs_reserved = 0;
675 int rc;
676
677 pr_info("Attempting to hot-add %d LMB(s)\n", lmbs_to_add);
678
679 if (lmbs_to_add == 0)
680 return -EINVAL;
681
682 /* Validate that there are enough LMBs to satisfy the request */
683 for_each_drmem_lmb(lmb) {
684 if (lmb->flags & DRCONF_MEM_RESERVED)
685 continue;
686
687 if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
688 lmbs_available++;
689
690 if (lmbs_available == lmbs_to_add)
691 break;
692 }
693
694 if (lmbs_available < lmbs_to_add)
695 return -EINVAL;
696
697 for_each_drmem_lmb(lmb) {
698 if (lmb->flags & DRCONF_MEM_ASSIGNED)
699 continue;
700
701 rc = dlpar_acquire_drc(lmb->drc_index);
702 if (rc)
703 continue;
704
705 rc = dlpar_add_lmb(lmb);
706 if (rc) {
707 dlpar_release_drc(lmb->drc_index);
708 continue;
709 }
710
711 /* Mark this lmb so we can remove it later if all of the
712 * requested LMBs cannot be added.
713 */
714 drmem_mark_lmb_reserved(lmb);
715 lmbs_reserved++;
716 if (lmbs_reserved == lmbs_to_add)
717 break;
718 }
719
720 if (lmbs_reserved != lmbs_to_add) {
721 pr_err("Memory hot-add failed, removing any added LMBs\n");
722
723 for_each_drmem_lmb(lmb) {
724 if (!drmem_lmb_reserved(lmb))
725 continue;
726
727 rc = dlpar_remove_lmb(lmb);
728 if (rc)
729 pr_err("Failed to remove LMB, drc index %x\n",
730 lmb->drc_index);
731 else
732 dlpar_release_drc(lmb->drc_index);
733
734 drmem_remove_lmb_reservation(lmb);
735 lmbs_reserved--;
736
737 if (lmbs_reserved == 0)
738 break;
739 }
740 rc = -EINVAL;
741 } else {
742 for_each_drmem_lmb(lmb) {
743 if (!drmem_lmb_reserved(lmb))
744 continue;
745
746 pr_debug("Memory at %llx (drc index %x) was hot-added\n",
747 lmb->base_addr, lmb->drc_index);
748 drmem_remove_lmb_reservation(lmb);
749 lmbs_reserved--;
750
751 if (lmbs_reserved == 0)
752 break;
753 }
754 rc = 0;
755 }
756
757 return rc;
758 }
759
dlpar_memory_add_by_index(u32 drc_index)760 static int dlpar_memory_add_by_index(u32 drc_index)
761 {
762 struct drmem_lmb *lmb;
763 int rc, lmb_found;
764
765 pr_info("Attempting to hot-add LMB, drc index %x\n", drc_index);
766
767 lmb_found = 0;
768 for_each_drmem_lmb(lmb) {
769 if (lmb->drc_index == drc_index) {
770 lmb_found = 1;
771 rc = dlpar_acquire_drc(lmb->drc_index);
772 if (!rc) {
773 rc = dlpar_add_lmb(lmb);
774 if (rc)
775 dlpar_release_drc(lmb->drc_index);
776 }
777
778 break;
779 }
780 }
781
782 if (!lmb_found)
783 rc = -EINVAL;
784
785 if (rc)
786 pr_info("Failed to hot-add memory, drc index %x\n", drc_index);
787 else
788 pr_info("Memory at %llx (drc index %x) was hot-added\n",
789 lmb->base_addr, drc_index);
790
791 return rc;
792 }
793
dlpar_memory_add_by_ic(u32 lmbs_to_add,u32 drc_index)794 static int dlpar_memory_add_by_ic(u32 lmbs_to_add, u32 drc_index)
795 {
796 struct drmem_lmb *lmb, *start_lmb, *end_lmb;
797 int rc;
798
799 pr_info("Attempting to hot-add %u LMB(s) at index %x\n",
800 lmbs_to_add, drc_index);
801
802 if (lmbs_to_add == 0)
803 return -EINVAL;
804
805 rc = get_lmb_range(drc_index, lmbs_to_add, &start_lmb, &end_lmb);
806 if (rc)
807 return -EINVAL;
808
809 /* Validate that the LMBs in this range are not reserved */
810 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
811 /* Fail immediately if the whole range can't be hot-added */
812 if (lmb->flags & DRCONF_MEM_RESERVED) {
813 pr_err("Memory at %llx (drc index %x) is reserved\n",
814 lmb->base_addr, lmb->drc_index);
815 return -EINVAL;
816 }
817 }
818
819 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
820 if (lmb->flags & DRCONF_MEM_ASSIGNED)
821 continue;
822
823 rc = dlpar_acquire_drc(lmb->drc_index);
824 if (rc)
825 break;
826
827 rc = dlpar_add_lmb(lmb);
828 if (rc) {
829 dlpar_release_drc(lmb->drc_index);
830 break;
831 }
832
833 drmem_mark_lmb_reserved(lmb);
834 }
835
836 if (rc) {
837 pr_err("Memory indexed-count-add failed, removing any added LMBs\n");
838
839 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
840 if (!drmem_lmb_reserved(lmb))
841 continue;
842
843 rc = dlpar_remove_lmb(lmb);
844 if (rc)
845 pr_err("Failed to remove LMB, drc index %x\n",
846 lmb->drc_index);
847 else
848 dlpar_release_drc(lmb->drc_index);
849
850 drmem_remove_lmb_reservation(lmb);
851 }
852 rc = -EINVAL;
853 } else {
854 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
855 if (!drmem_lmb_reserved(lmb))
856 continue;
857
858 pr_info("Memory at %llx (drc index %x) was hot-added\n",
859 lmb->base_addr, lmb->drc_index);
860 drmem_remove_lmb_reservation(lmb);
861 }
862 }
863
864 return rc;
865 }
866
dlpar_memory(struct pseries_hp_errorlog * hp_elog)867 int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
868 {
869 u32 count, drc_index;
870 int rc;
871
872 lock_device_hotplug();
873
874 switch (hp_elog->action) {
875 case PSERIES_HP_ELOG_ACTION_ADD:
876 switch (hp_elog->id_type) {
877 case PSERIES_HP_ELOG_ID_DRC_COUNT:
878 count = hp_elog->_drc_u.drc_count;
879 rc = dlpar_memory_add_by_count(count);
880 break;
881 case PSERIES_HP_ELOG_ID_DRC_INDEX:
882 drc_index = hp_elog->_drc_u.drc_index;
883 rc = dlpar_memory_add_by_index(drc_index);
884 break;
885 case PSERIES_HP_ELOG_ID_DRC_IC:
886 count = hp_elog->_drc_u.ic.count;
887 drc_index = hp_elog->_drc_u.ic.index;
888 rc = dlpar_memory_add_by_ic(count, drc_index);
889 break;
890 default:
891 rc = -EINVAL;
892 break;
893 }
894
895 break;
896 case PSERIES_HP_ELOG_ACTION_REMOVE:
897 switch (hp_elog->id_type) {
898 case PSERIES_HP_ELOG_ID_DRC_COUNT:
899 count = hp_elog->_drc_u.drc_count;
900 rc = dlpar_memory_remove_by_count(count);
901 break;
902 case PSERIES_HP_ELOG_ID_DRC_INDEX:
903 drc_index = hp_elog->_drc_u.drc_index;
904 rc = dlpar_memory_remove_by_index(drc_index);
905 break;
906 case PSERIES_HP_ELOG_ID_DRC_IC:
907 count = hp_elog->_drc_u.ic.count;
908 drc_index = hp_elog->_drc_u.ic.index;
909 rc = dlpar_memory_remove_by_ic(count, drc_index);
910 break;
911 default:
912 rc = -EINVAL;
913 break;
914 }
915
916 break;
917 default:
918 pr_err("Invalid action (%d) specified\n", hp_elog->action);
919 rc = -EINVAL;
920 break;
921 }
922
923 if (!rc)
924 rc = drmem_update_dt();
925
926 unlock_device_hotplug();
927 return rc;
928 }
929
pseries_add_mem_node(struct device_node * np)930 static int pseries_add_mem_node(struct device_node *np)
931 {
932 const __be32 *prop;
933 unsigned long base;
934 unsigned long lmb_size;
935 int ret = -EINVAL;
936 int addr_cells, size_cells;
937
938 /*
939 * Check to see if we are actually adding memory
940 */
941 if (!of_node_is_type(np, "memory"))
942 return 0;
943
944 /*
945 * Find the base and size of the memblock
946 */
947 prop = of_get_property(np, "reg", NULL);
948 if (!prop)
949 return ret;
950
951 addr_cells = of_n_addr_cells(np);
952 size_cells = of_n_size_cells(np);
953 /*
954 * "reg" property represents (addr,size) tuple.
955 */
956 base = of_read_number(prop, addr_cells);
957 prop += addr_cells;
958 lmb_size = of_read_number(prop, size_cells);
959
960 /*
961 * Update memory region to represent the memory add
962 */
963 ret = memblock_add(base, lmb_size);
964 return (ret < 0) ? -EINVAL : 0;
965 }
966
pseries_memory_notifier(struct notifier_block * nb,unsigned long action,void * data)967 static int pseries_memory_notifier(struct notifier_block *nb,
968 unsigned long action, void *data)
969 {
970 struct of_reconfig_data *rd = data;
971 int err = 0;
972
973 switch (action) {
974 case OF_RECONFIG_ATTACH_NODE:
975 err = pseries_add_mem_node(rd->dn);
976 break;
977 case OF_RECONFIG_DETACH_NODE:
978 err = pseries_remove_mem_node(rd->dn);
979 break;
980 case OF_RECONFIG_UPDATE_PROPERTY:
981 if (!strcmp(rd->dn->name,
982 "ibm,dynamic-reconfiguration-memory"))
983 drmem_update_lmbs(rd->prop);
984 }
985 return notifier_from_errno(err);
986 }
987
988 static struct notifier_block pseries_mem_nb = {
989 .notifier_call = pseries_memory_notifier,
990 };
991
pseries_memory_hotplug_init(void)992 static int __init pseries_memory_hotplug_init(void)
993 {
994 if (firmware_has_feature(FW_FEATURE_LPAR))
995 of_reconfig_notifier_register(&pseries_mem_nb);
996
997 return 0;
998 }
999 machine_device_initcall(pseries, pseries_memory_hotplug_init);
1000
