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                 pr_err("Failed memory block lookup for LMB 0x%x\n", lmb->drc_index);
 213                 return -EINVAL;
 214         }
 215
 216         if (online && mem_block->dev.offline)
 217                 rc = device_online(&mem_block->dev);
 218         else if (!online && !mem_block->dev.offline)
 219                 rc = device_offline(&mem_block->dev);
 220         else
 221                 rc = 0;
 222
 223         put_device(&mem_block->dev);
 224
 225         return rc;
 226 }
 227
 228 static int dlpar_online_lmb(struct drmem_lmb *lmb)
 229 {
 230         return dlpar_change_lmb_state(lmb, true);
 231 }
 232
 233 #ifdef CONFIG_MEMORY_HOTREMOVE
 234 static int dlpar_offline_lmb(struct drmem_lmb *lmb)
 235 {
 236         return dlpar_change_lmb_state(lmb, false);
 237 }
 238
 239 static int pseries_remove_memblock(unsigned long base, unsigned long memblock_size)
 240 {
 241         unsigned long start_pfn;
 242         int sections_per_block;
 243         int i;
 244
 245         start_pfn = base >> PAGE_SHIFT;
 246
 247         lock_device_hotplug();
 248
 249         if (!pfn_valid(start_pfn))
 250                 goto out;
 251
 252         sections_per_block = memory_block_size / MIN_MEMORY_BLOCK_SIZE;
 253
 254         for (i = 0; i < sections_per_block; i++) {
 255                 __remove_memory(base, MIN_MEMORY_BLOCK_SIZE);
 256                 base += MIN_MEMORY_BLOCK_SIZE;
 257         }
 258
 259 out:
 260         /* Update memory regions for memory remove */
 261         memblock_remove(base, memblock_size);
 262         unlock_device_hotplug();
 263         return 0;
 264 }
 265
 266 static int pseries_remove_mem_node(struct device_node *np)
 267 {
 268         int ret;
 269         struct resource res;
 270
 271         /*
 272          * Check to see if we are actually removing memory
 273          */
 274         if (!of_node_is_type(np, "memory"))
 275                 return 0;
 276
 277         /*
 278          * Find the base address and size of the memblock
 279          */
 280         ret = of_address_to_resource(np, 0, &res);
 281         if (ret)
 282                 return ret;
 283
 284         pseries_remove_memblock(res.start, resource_size(&res));
 285         return 0;
 286 }
 287
 288 static bool lmb_is_removable(struct drmem_lmb *lmb)
 289 {
 290         if ((lmb->flags & DRCONF_MEM_RESERVED) ||
 291                 !(lmb->flags & DRCONF_MEM_ASSIGNED))
 292                 return false;
 293
 294 #ifdef CONFIG_FA_DUMP
 295         /*
 296          * Don't hot-remove memory that falls in fadump boot memory area
 297          * and memory that is reserved for capturing old kernel memory.
 298          */
 299         if (is_fadump_memory_area(lmb->base_addr, memory_block_size_bytes()))
 300                 return false;
 301 #endif
 302         /* device_offline() will determine if we can actually remove this lmb */
 303         return true;
 304 }
 305
 306 static int dlpar_add_lmb(struct drmem_lmb *);
 307
 308 static int dlpar_remove_lmb(struct drmem_lmb *lmb)
 309 {
 310         struct memory_block *mem_block;
 311         int rc;
 312
 313         if (!lmb_is_removable(lmb))
 314                 return -EINVAL;
 315
 316         mem_block = lmb_to_memblock(lmb);
 317         if (mem_block == NULL)
 318                 return -EINVAL;
 319
 320         rc = dlpar_offline_lmb(lmb);
 321         if (rc) {
 322                 put_device(&mem_block->dev);
 323                 return rc;
 324         }
 325
 326         __remove_memory(lmb->base_addr, memory_block_size);
 327         put_device(&mem_block->dev);
 328
 329         /* Update memory regions for memory remove */
 330         memblock_remove(lmb->base_addr, memory_block_size);
 331
 332         invalidate_lmb_associativity_index(lmb);
 333         lmb->flags &= ~DRCONF_MEM_ASSIGNED;
 334
 335         return 0;
 336 }
 337
 338 static int dlpar_memory_remove_by_count(u32 lmbs_to_remove)
 339 {
 340         struct drmem_lmb *lmb;
 341         int lmbs_reserved = 0;
 342         int lmbs_available = 0;
 343         int rc;
 344
 345         pr_info("Attempting to hot-remove %d LMB(s)\n", lmbs_to_remove);
 346
 347         if (lmbs_to_remove == 0)
 348                 return -EINVAL;
 349
 350         /* Validate that there are enough LMBs to satisfy the request */
 351         for_each_drmem_lmb(lmb) {
 352                 if (lmb_is_removable(lmb))
 353                         lmbs_available++;
 354
 355                 if (lmbs_available == lmbs_to_remove)
 356                         break;
 357         }
 358
 359         if (lmbs_available < lmbs_to_remove) {
 360                 pr_info("Not enough LMBs available (%d of %d) to satisfy request\n",
 361                         lmbs_available, lmbs_to_remove);
 362                 return -EINVAL;
 363         }
 364
 365         for_each_drmem_lmb(lmb) {
 366                 rc = dlpar_remove_lmb(lmb);
 367                 if (rc)
 368                         continue;
 369
 370                 /* Mark this lmb so we can add it later if all of the
 371                  * requested LMBs cannot be removed.
 372                  */
 373                 drmem_mark_lmb_reserved(lmb);
 374
 375                 lmbs_reserved++;
 376                 if (lmbs_reserved == lmbs_to_remove)
 377                         break;
 378         }
 379
 380         if (lmbs_reserved != lmbs_to_remove) {
 381                 pr_err("Memory hot-remove failed, adding LMB's back\n");
 382
 383                 for_each_drmem_lmb(lmb) {
 384                         if (!drmem_lmb_reserved(lmb))
 385                                 continue;
 386
 387                         rc = dlpar_add_lmb(lmb);
 388                         if (rc)
 389                                 pr_err("Failed to add LMB back, drc index %x\n",
 390                                        lmb->drc_index);
 391
 392                         drmem_remove_lmb_reservation(lmb);
 393
 394                         lmbs_reserved--;
 395                         if (lmbs_reserved == 0)
 396                                 break;
 397                 }
 398
 399                 rc = -EINVAL;
 400         } else {
 401                 for_each_drmem_lmb(lmb) {
 402                         if (!drmem_lmb_reserved(lmb))
 403                                 continue;
 404
 405                         dlpar_release_drc(lmb->drc_index);
 406                         pr_info("Memory at %llx was hot-removed\n",
 407                                 lmb->base_addr);
 408
 409                         drmem_remove_lmb_reservation(lmb);
 410
 411                         lmbs_reserved--;
 412                         if (lmbs_reserved == 0)
 413                                 break;
 414                 }
 415                 rc = 0;
 416         }
 417
 418         return rc;
 419 }
 420
 421 static int dlpar_memory_remove_by_index(u32 drc_index)
 422 {
 423         struct drmem_lmb *lmb;
 424         int lmb_found;
 425         int rc;
 426
 427         pr_debug("Attempting to hot-remove LMB, drc index %x\n", drc_index);
 428
 429         lmb_found = 0;
 430         for_each_drmem_lmb(lmb) {
 431                 if (lmb->drc_index == drc_index) {
 432                         lmb_found = 1;
 433                         rc = dlpar_remove_lmb(lmb);
 434                         if (!rc)
 435                                 dlpar_release_drc(lmb->drc_index);
 436
 437                         break;
 438                 }
 439         }
 440
 441         if (!lmb_found) {
 442                 pr_debug("Failed to look up LMB for drc index %x\n", drc_index);
 443                 rc = -EINVAL;
 444         } else if (rc) {
 445                 pr_debug("Failed to hot-remove memory at %llx\n",
 446                          lmb->base_addr);
 447         } else {
 448                 pr_debug("Memory at %llx was hot-removed\n", lmb->base_addr);
 449         }
 450
 451         return rc;
 452 }
 453
 454 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 455 {
 456         struct drmem_lmb *lmb, *start_lmb, *end_lmb;
 457         int rc;
 458
 459         pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
 460                 lmbs_to_remove, drc_index);
 461
 462         if (lmbs_to_remove == 0)
 463                 return -EINVAL;
 464
 465         rc = get_lmb_range(drc_index, lmbs_to_remove, &start_lmb, &end_lmb);
 466         if (rc)
 467                 return -EINVAL;
 468
 469         /*
 470          * Validate that all LMBs in range are not reserved. Note that it
 471          * is ok if they are !ASSIGNED since our goal here is to remove the
 472          * LMB range, regardless of whether some LMBs were already removed
 473          * by any other reason.
 474          *
 475          * This is a contrast to what is done in remove_by_count() where we
 476          * check for both RESERVED and !ASSIGNED (via lmb_is_removable()),
 477          * because we want to remove a fixed amount of LMBs in that function.
 478          */
 479         for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 480                 if (lmb->flags & DRCONF_MEM_RESERVED) {
 481                         pr_err("Memory at %llx (drc index %x) is reserved\n",
 482                                 lmb->base_addr, lmb->drc_index);
 483                         return -EINVAL;
 484                 }
 485         }
 486
 487         for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 488                 /*
 489                  * dlpar_remove_lmb() will error out if the LMB is already
 490                  * !ASSIGNED, but this case is a no-op for us.
 491                  */
 492                 if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
 493                         continue;
 494
 495                 rc = dlpar_remove_lmb(lmb);
 496                 if (rc)
 497                         break;
 498
 499                 drmem_mark_lmb_reserved(lmb);
 500         }
 501
 502         if (rc) {
 503                 pr_err("Memory indexed-count-remove failed, adding any removed LMBs\n");
 504
 505
 506                 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 507                         if (!drmem_lmb_reserved(lmb))
 508                                 continue;
 509
 510                         /*
 511                          * Setting the isolation state of an UNISOLATED/CONFIGURED
 512                          * device to UNISOLATE is a no-op, but the hypervisor can
 513                          * use it as a hint that the LMB removal failed.
 514                          */
 515                         dlpar_unisolate_drc(lmb->drc_index);
 516
 517                         rc = dlpar_add_lmb(lmb);
 518                         if (rc)
 519                                 pr_err("Failed to add LMB, drc index %x\n",
 520                                        lmb->drc_index);
 521
 522                         drmem_remove_lmb_reservation(lmb);
 523                 }
 524                 rc = -EINVAL;
 525         } else {
 526                 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 527                         if (!drmem_lmb_reserved(lmb))
 528                                 continue;
 529
 530                         dlpar_release_drc(lmb->drc_index);
 531                         pr_info("Memory at %llx (drc index %x) was hot-removed\n",
 532                                 lmb->base_addr, lmb->drc_index);
 533
 534                         drmem_remove_lmb_reservation(lmb);
 535                 }
 536         }
 537
 538         return rc;
 539 }
 540
 541 #else
 542 static inline int pseries_remove_memblock(unsigned long base,
 543                                           unsigned long memblock_size)
 544 {
 545         return -EOPNOTSUPP;
 546 }
 547 static inline int pseries_remove_mem_node(struct device_node *np)
 548 {
 549         return 0;
 550 }
 551 static int dlpar_remove_lmb(struct drmem_lmb *lmb)
 552 {
 553         return -EOPNOTSUPP;
 554 }
 555 static int dlpar_memory_remove_by_count(u32 lmbs_to_remove)
 556 {
 557         return -EOPNOTSUPP;
 558 }
 559 static int dlpar_memory_remove_by_index(u32 drc_index)
 560 {
 561         return -EOPNOTSUPP;
 562 }
 563
 564 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 565 {
 566         return -EOPNOTSUPP;
 567 }
 568 #endif /* CONFIG_MEMORY_HOTREMOVE */
 569
 570 static int dlpar_add_lmb(struct drmem_lmb *lmb)
 571 {
 572         unsigned long block_sz;
 573         int nid, rc;
 574
 575         if (lmb->flags & DRCONF_MEM_ASSIGNED)
 576                 return -EINVAL;
 577
 578         rc = update_lmb_associativity_index(lmb);
 579         if (rc) {
 580                 dlpar_release_drc(lmb->drc_index);
 581                 pr_err("Failed to configure LMB 0x%x\n", lmb->drc_index);
 582                 return rc;
 583         }
 584
 585         block_sz = memory_block_size_bytes();
 586
 587         /* Find the node id for this LMB.  Fake one if necessary. */
 588         nid = of_drconf_to_nid_single(lmb);
 589         if (nid < 0 || !node_possible(nid))
 590                 nid = first_online_node;
 591
 592         /* Add the memory */
 593         rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_MEMMAP_ON_MEMORY);
 594         if (rc) {
 595                 pr_err("Failed to add LMB 0x%x to node %u", lmb->drc_index, nid);
 596                 invalidate_lmb_associativity_index(lmb);
 597                 return rc;
 598         }
 599
 600         rc = dlpar_online_lmb(lmb);
 601         if (rc) {
 602                 pr_err("Failed to online LMB 0x%x on node %u\n", lmb->drc_index, nid);
 603                 __remove_memory(lmb->base_addr, block_sz);
 604                 invalidate_lmb_associativity_index(lmb);
 605         } else {
 606                 lmb->flags |= DRCONF_MEM_ASSIGNED;
 607         }
 608
 609         return rc;
 610 }
 611
 612 static int dlpar_memory_add_by_count(u32 lmbs_to_add)
 613 {
 614         struct drmem_lmb *lmb;
 615         int lmbs_available = 0;
 616         int lmbs_reserved = 0;
 617         int rc;
 618
 619         pr_info("Attempting to hot-add %d LMB(s)\n", lmbs_to_add);
 620
 621         if (lmbs_to_add == 0)
 622                 return -EINVAL;
 623
 624         /* Validate that there are enough LMBs to satisfy the request */
 625         for_each_drmem_lmb(lmb) {
 626                 if (lmb->flags & DRCONF_MEM_RESERVED)
 627                         continue;
 628
 629                 if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
 630                         lmbs_available++;
 631
 632                 if (lmbs_available == lmbs_to_add)
 633                         break;
 634         }
 635
 636         if (lmbs_available < lmbs_to_add)
 637                 return -EINVAL;
 638
 639         for_each_drmem_lmb(lmb) {
 640                 if (lmb->flags & DRCONF_MEM_ASSIGNED)
 641                         continue;
 642
 643                 rc = dlpar_acquire_drc(lmb->drc_index);
 644                 if (rc)
 645                         continue;
 646
 647                 rc = dlpar_add_lmb(lmb);
 648                 if (rc) {
 649                         dlpar_release_drc(lmb->drc_index);
 650                         continue;
 651                 }
 652
 653                 /* Mark this lmb so we can remove it later if all of the
 654                  * requested LMBs cannot be added.
 655                  */
 656                 drmem_mark_lmb_reserved(lmb);
 657                 lmbs_reserved++;
 658                 if (lmbs_reserved == lmbs_to_add)
 659                         break;
 660         }
 661
 662         if (lmbs_reserved != lmbs_to_add) {
 663                 pr_err("Memory hot-add failed, removing any added LMBs\n");
 664
 665                 for_each_drmem_lmb(lmb) {
 666                         if (!drmem_lmb_reserved(lmb))
 667                                 continue;
 668
 669                         rc = dlpar_remove_lmb(lmb);
 670                         if (rc)
 671                                 pr_err("Failed to remove LMB, drc index %x\n",
 672                                        lmb->drc_index);
 673                         else
 674                                 dlpar_release_drc(lmb->drc_index);
 675
 676                         drmem_remove_lmb_reservation(lmb);
 677                         lmbs_reserved--;
 678
 679                         if (lmbs_reserved == 0)
 680                                 break;
 681                 }
 682                 rc = -EINVAL;
 683         } else {
 684                 for_each_drmem_lmb(lmb) {
 685                         if (!drmem_lmb_reserved(lmb))
 686                                 continue;
 687
 688                         pr_debug("Memory at %llx (drc index %x) was hot-added\n",
 689                                  lmb->base_addr, lmb->drc_index);
 690                         drmem_remove_lmb_reservation(lmb);
 691                         lmbs_reserved--;
 692
 693                         if (lmbs_reserved == 0)
 694                                 break;
 695                 }
 696                 rc = 0;
 697         }
 698
 699         return rc;
 700 }
 701
 702 static int dlpar_memory_add_by_index(u32 drc_index)
 703 {
 704         struct drmem_lmb *lmb;
 705         int rc, lmb_found;
 706
 707         pr_info("Attempting to hot-add LMB, drc index %x\n", drc_index);
 708
 709         lmb_found = 0;
 710         for_each_drmem_lmb(lmb) {
 711                 if (lmb->drc_index == drc_index) {
 712                         lmb_found = 1;
 713                         rc = dlpar_acquire_drc(lmb->drc_index);
 714                         if (!rc) {
 715                                 rc = dlpar_add_lmb(lmb);
 716                                 if (rc)
 717                                         dlpar_release_drc(lmb->drc_index);
 718                         }
 719
 720                         break;
 721                 }
 722         }
 723
 724         if (!lmb_found)
 725                 rc = -EINVAL;
 726
 727         if (rc)
 728                 pr_info("Failed to hot-add memory, drc index %x\n", drc_index);
 729         else
 730                 pr_info("Memory at %llx (drc index %x) was hot-added\n",
 731                         lmb->base_addr, drc_index);
 732
 733         return rc;
 734 }
 735
 736 static int dlpar_memory_add_by_ic(u32 lmbs_to_add, u32 drc_index)
 737 {
 738         struct drmem_lmb *lmb, *start_lmb, *end_lmb;
 739         int rc;
 740
 741         pr_info("Attempting to hot-add %u LMB(s) at index %x\n",
 742                 lmbs_to_add, drc_index);
 743
 744         if (lmbs_to_add == 0)
 745                 return -EINVAL;
 746
 747         rc = get_lmb_range(drc_index, lmbs_to_add, &start_lmb, &end_lmb);
 748         if (rc)
 749                 return -EINVAL;
 750
 751         /* Validate that the LMBs in this range are not reserved */
 752         for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 753                 /* Fail immediately if the whole range can't be hot-added */
 754                 if (lmb->flags & DRCONF_MEM_RESERVED) {
 755                         pr_err("Memory at %llx (drc index %x) is reserved\n",
 756                                         lmb->base_addr, lmb->drc_index);
 757                         return -EINVAL;
 758                 }
 759         }
 760
 761         for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 762                 if (lmb->flags & DRCONF_MEM_ASSIGNED)
 763                         continue;
 764
 765                 rc = dlpar_acquire_drc(lmb->drc_index);
 766                 if (rc)
 767                         break;
 768
 769                 rc = dlpar_add_lmb(lmb);
 770                 if (rc) {
 771                         dlpar_release_drc(lmb->drc_index);
 772                         break;
 773                 }
 774
 775                 drmem_mark_lmb_reserved(lmb);
 776         }
 777
 778         if (rc) {
 779                 pr_err("Memory indexed-count-add failed, removing any added LMBs\n");
 780
 781                 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 782                         if (!drmem_lmb_reserved(lmb))
 783                                 continue;
 784
 785                         rc = dlpar_remove_lmb(lmb);
 786                         if (rc)
 787                                 pr_err("Failed to remove LMB, drc index %x\n",
 788                                        lmb->drc_index);
 789                         else
 790                                 dlpar_release_drc(lmb->drc_index);
 791
 792                         drmem_remove_lmb_reservation(lmb);
 793                 }
 794                 rc = -EINVAL;
 795         } else {
 796                 for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
 797                         if (!drmem_lmb_reserved(lmb))
 798                                 continue;
 799
 800                         pr_info("Memory at %llx (drc index %x) was hot-added\n",
 801                                 lmb->base_addr, lmb->drc_index);
 802                         drmem_remove_lmb_reservation(lmb);
 803                 }
 804         }
 805
 806         return rc;
 807 }
 808
 809 int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
 810 {
 811         u32 count, drc_index;
 812         int rc;
 813
 814         lock_device_hotplug();
 815
 816         switch (hp_elog->action) {
 817         case PSERIES_HP_ELOG_ACTION_ADD:
 818                 switch (hp_elog->id_type) {
 819                 case PSERIES_HP_ELOG_ID_DRC_COUNT:
 820                         count = hp_elog->_drc_u.drc_count;
 821                         rc = dlpar_memory_add_by_count(count);
 822                         break;
 823                 case PSERIES_HP_ELOG_ID_DRC_INDEX:
 824                         drc_index = hp_elog->_drc_u.drc_index;
 825                         rc = dlpar_memory_add_by_index(drc_index);
 826                         break;
 827                 case PSERIES_HP_ELOG_ID_DRC_IC:
 828                         count = hp_elog->_drc_u.ic.count;
 829                         drc_index = hp_elog->_drc_u.ic.index;
 830                         rc = dlpar_memory_add_by_ic(count, drc_index);
 831                         break;
 832                 default:
 833                         rc = -EINVAL;
 834                         break;
 835                 }
 836
 837                 break;
 838         case PSERIES_HP_ELOG_ACTION_REMOVE:
 839                 switch (hp_elog->id_type) {
 840                 case PSERIES_HP_ELOG_ID_DRC_COUNT:
 841                         count = hp_elog->_drc_u.drc_count;
 842                         rc = dlpar_memory_remove_by_count(count);
 843                         break;
 844                 case PSERIES_HP_ELOG_ID_DRC_INDEX:
 845                         drc_index = hp_elog->_drc_u.drc_index;
 846                         rc = dlpar_memory_remove_by_index(drc_index);
 847                         break;
 848                 case PSERIES_HP_ELOG_ID_DRC_IC:
 849                         count = hp_elog->_drc_u.ic.count;
 850                         drc_index = hp_elog->_drc_u.ic.index;
 851                         rc = dlpar_memory_remove_by_ic(count, drc_index);
 852                         break;
 853                 default:
 854                         rc = -EINVAL;
 855                         break;
 856                 }
 857
 858                 break;
 859         default:
 860                 pr_err("Invalid action (%d) specified\n", hp_elog->action);
 861                 rc = -EINVAL;
 862                 break;
 863         }
 864
 865         if (!rc)
 866                 rc = drmem_update_dt();
 867
 868         unlock_device_hotplug();
 869         return rc;
 870 }
 871
 872 static int pseries_add_mem_node(struct device_node *np)
 873 {
 874         int ret;
 875         struct resource res;
 876
 877         /*
 878          * Check to see if we are actually adding memory
 879          */
 880         if (!of_node_is_type(np, "memory"))
 881                 return 0;
 882
 883         /*
 884          * Find the base and size of the memblock
 885          */
 886         ret = of_address_to_resource(np, 0, &res);
 887         if (ret)
 888                 return ret;
 889
 890         /*
 891          * Update memory region to represent the memory add
 892          */
 893         ret = memblock_add(res.start, resource_size(&res));
 894         return (ret < 0) ? -EINVAL : 0;
 895 }
 896
 897 static int pseries_memory_notifier(struct notifier_block *nb,
 898                                    unsigned long action, void *data)
 899 {
 900         struct of_reconfig_data *rd = data;
 901         int err = 0;
 902
 903         switch (action) {
 904         case OF_RECONFIG_ATTACH_NODE:
 905                 err = pseries_add_mem_node(rd->dn);
 906                 break;
 907         case OF_RECONFIG_DETACH_NODE:
 908                 err = pseries_remove_mem_node(rd->dn);
 909                 break;
 910         case OF_RECONFIG_UPDATE_PROPERTY:
 911                 if (!strcmp(rd->dn->name,
 912                             "ibm,dynamic-reconfiguration-memory"))
 913                         drmem_update_lmbs(rd->prop);
 914         }
 915         return notifier_from_errno(err);
 916 }
 917
 918 static struct notifier_block pseries_mem_nb = {
 919         .notifier_call = pseries_memory_notifier,
 920 };
 921
 922 static int __init pseries_memory_hotplug_init(void)
 923 {
 924         if (firmware_has_feature(FW_FEATURE_LPAR))
 925                 of_reconfig_notifier_register(&pseries_mem_nb);
 926
 927         return 0;
 928 }
 929 machine_device_initcall(pseries, pseries_memory_hotplug_init);