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