arch/powerpc/platforms/pseries/hotplug-memory.c

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