arch/powerpc/platforms/pseries/dlpar.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Support for dynamic reconfiguration for PCI, Memory, and CPU
   4  * Hotplug and Dynamic Logical Partitioning on RPA platforms.
   5  *
   6  * Copyright (C) 2009 Nathan Fontenot
   7  * Copyright (C) 2009 IBM Corporation
   8  */
   9
  10 #define pr_fmt(fmt)     "dlpar: " fmt
  11
  12 #include <linux/kernel.h>
  13 #include <linux/notifier.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/cpu.h>
  16 #include <linux/slab.h>
  17 #include <linux/of.h>
  18
  19 #include "of_helpers.h"
  20 #include "pseries.h"
  21
  22 #include <asm/machdep.h>
  23 #include <linux/uaccess.h>
  24 #include <asm/rtas.h>
  25 #include <asm/rtas-work-area.h>
  26
  27 static struct workqueue_struct *pseries_hp_wq;
  28
  29 struct pseries_hp_work {
  30         struct work_struct work;
  31         struct pseries_hp_errorlog *errlog;
  32 };
  33
  34 struct cc_workarea {
  35         __be32  drc_index;
  36         __be32  zero;
  37         __be32  name_offset;
  38         __be32  prop_length;
  39         __be32  prop_offset;
  40 };
  41
  42 void dlpar_free_cc_property(struct property *prop)
  43 {
  44         kfree(prop->name);
  45         kfree(prop->value);
  46         kfree(prop);
  47 }
  48
  49 static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
  50 {
  51         struct property *prop;
  52         char *name;
  53         char *value;
  54
  55         prop = kzalloc(sizeof(*prop), GFP_KERNEL);
  56         if (!prop)
  57                 return NULL;
  58
  59         name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
  60         prop->name = kstrdup(name, GFP_KERNEL);
  61         if (!prop->name) {
  62                 dlpar_free_cc_property(prop);
  63                 return NULL;
  64         }
  65
  66         prop->length = be32_to_cpu(ccwa->prop_length);
  67         value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
  68         prop->value = kmemdup(value, prop->length, GFP_KERNEL);
  69         if (!prop->value) {
  70                 dlpar_free_cc_property(prop);
  71                 return NULL;
  72         }
  73
  74         return prop;
  75 }
  76
  77 static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
  78 {
  79         struct device_node *dn;
  80         const char *name;
  81
  82         dn = kzalloc(sizeof(*dn), GFP_KERNEL);
  83         if (!dn)
  84                 return NULL;
  85
  86         name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
  87         dn->full_name = kstrdup(name, GFP_KERNEL);
  88         if (!dn->full_name) {
  89                 kfree(dn);
  90                 return NULL;
  91         }
  92
  93         of_node_set_flag(dn, OF_DYNAMIC);
  94         of_node_init(dn);
  95
  96         return dn;
  97 }
  98
  99 static void dlpar_free_one_cc_node(struct device_node *dn)
 100 {
 101         struct property *prop;
 102
 103         while (dn->properties) {
 104                 prop = dn->properties;
 105                 dn->properties = prop->next;
 106                 dlpar_free_cc_property(prop);
 107         }
 108
 109         kfree(dn->full_name);
 110         kfree(dn);
 111 }
 112
 113 void dlpar_free_cc_nodes(struct device_node *dn)
 114 {
 115         if (dn->child)
 116                 dlpar_free_cc_nodes(dn->child);
 117
 118         if (dn->sibling)
 119                 dlpar_free_cc_nodes(dn->sibling);
 120
 121         dlpar_free_one_cc_node(dn);
 122 }
 123
 124 #define COMPLETE        0
 125 #define NEXT_SIBLING    1
 126 #define NEXT_CHILD      2
 127 #define NEXT_PROPERTY   3
 128 #define PREV_PARENT     4
 129 #define MORE_MEMORY     5
 130 #define ERR_CFG_USE     -9003
 131
 132 struct device_node *dlpar_configure_connector(__be32 drc_index,
 133                                               struct device_node *parent)
 134 {
 135         struct device_node *dn;
 136         struct device_node *first_dn = NULL;
 137         struct device_node *last_dn = NULL;
 138         struct property *property;
 139         struct property *last_property = NULL;
 140         struct cc_workarea *ccwa;
 141         struct rtas_work_area *work_area;
 142         char *data_buf;
 143         int cc_token;
 144         int rc = -1;
 145
 146         cc_token = rtas_function_token(RTAS_FN_IBM_CONFIGURE_CONNECTOR);
 147         if (cc_token == RTAS_UNKNOWN_SERVICE)
 148                 return NULL;
 149
 150         work_area = rtas_work_area_alloc(SZ_4K);
 151         data_buf = rtas_work_area_raw_buf(work_area);
 152
 153         ccwa = (struct cc_workarea *)&data_buf[0];
 154         ccwa->drc_index = drc_index;
 155         ccwa->zero = 0;
 156
 157         do {
 158                 do {
 159                         rc = rtas_call(cc_token, 2, 1, NULL,
 160                                        rtas_work_area_phys(work_area), NULL);
 161                 } while (rtas_busy_delay(rc));
 162
 163                 switch (rc) {
 164                 case COMPLETE:
 165                         break;
 166
 167                 case NEXT_SIBLING:
 168                         dn = dlpar_parse_cc_node(ccwa);
 169                         if (!dn)
 170                                 goto cc_error;
 171
 172                         dn->parent = last_dn->parent;
 173                         last_dn->sibling = dn;
 174                         last_dn = dn;
 175                         break;
 176
 177                 case NEXT_CHILD:
 178                         dn = dlpar_parse_cc_node(ccwa);
 179                         if (!dn)
 180                                 goto cc_error;
 181
 182                         if (!first_dn) {
 183                                 dn->parent = parent;
 184                                 first_dn = dn;
 185                         } else {
 186                                 dn->parent = last_dn;
 187                                 if (last_dn)
 188                                         last_dn->child = dn;
 189                         }
 190
 191                         last_dn = dn;
 192                         break;
 193
 194                 case NEXT_PROPERTY:
 195                         property = dlpar_parse_cc_property(ccwa);
 196                         if (!property)
 197                                 goto cc_error;
 198
 199                         if (!last_dn->properties)
 200                                 last_dn->properties = property;
 201                         else
 202                                 last_property->next = property;
 203
 204                         last_property = property;
 205                         break;
 206
 207                 case PREV_PARENT:
 208                         last_dn = last_dn->parent;
 209                         break;
 210
 211                 case MORE_MEMORY:
 212                 case ERR_CFG_USE:
 213                 default:
 214                         printk(KERN_ERR "Unexpected Error (%d) "
 215                                "returned from configure-connector\n", rc);
 216                         goto cc_error;
 217                 }
 218         } while (rc);
 219
 220 cc_error:
 221         rtas_work_area_free(work_area);
 222
 223         if (rc) {
 224                 if (first_dn)
 225                         dlpar_free_cc_nodes(first_dn);
 226
 227                 return NULL;
 228         }
 229
 230         return first_dn;
 231 }
 232
 233 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
 234 {
 235         int rc;
 236
 237         dn->parent = parent;
 238
 239         rc = of_attach_node(dn);
 240         if (rc) {
 241                 printk(KERN_ERR "Failed to add device node %pOF\n", dn);
 242                 return rc;
 243         }
 244
 245         return 0;
 246 }
 247
 248 int dlpar_detach_node(struct device_node *dn)
 249 {
 250         struct device_node *child;
 251         int rc;
 252
 253         child = of_get_next_child(dn, NULL);
 254         while (child) {
 255                 dlpar_detach_node(child);
 256                 child = of_get_next_child(dn, child);
 257         }
 258
 259         rc = of_detach_node(dn);
 260         if (rc)
 261                 return rc;
 262
 263         of_node_put(dn);
 264
 265         return 0;
 266 }
 267
 268 #define DR_ENTITY_SENSE         9003
 269 #define DR_ENTITY_PRESENT       1
 270 #define DR_ENTITY_UNUSABLE      2
 271 #define ALLOCATION_STATE        9003
 272 #define ALLOC_UNUSABLE          0
 273 #define ALLOC_USABLE            1
 274 #define ISOLATION_STATE         9001
 275 #define ISOLATE                 0
 276 #define UNISOLATE               1
 277
 278 int dlpar_acquire_drc(u32 drc_index)
 279 {
 280         int dr_status, rc;
 281
 282         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 283         if (rc || dr_status != DR_ENTITY_UNUSABLE)
 284                 return -1;
 285
 286         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
 287         if (rc)
 288                 return rc;
 289
 290         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 291         if (rc) {
 292                 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 293                 return rc;
 294         }
 295
 296         return 0;
 297 }
 298
 299 int dlpar_release_drc(u32 drc_index)
 300 {
 301         int dr_status, rc;
 302
 303         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 304         if (rc || dr_status != DR_ENTITY_PRESENT)
 305                 return -1;
 306
 307         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
 308         if (rc)
 309                 return rc;
 310
 311         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 312         if (rc) {
 313                 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 314                 return rc;
 315         }
 316
 317         return 0;
 318 }
 319
 320 int dlpar_unisolate_drc(u32 drc_index)
 321 {
 322         int dr_status, rc;
 323
 324         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 325         if (rc || dr_status != DR_ENTITY_PRESENT)
 326                 return -1;
 327
 328         rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 329
 330         return 0;
 331 }
 332
 333 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
 334 {
 335         int rc;
 336
 337         /* pseries error logs are in BE format, convert to cpu type */
 338         switch (hp_elog->id_type) {
 339         case PSERIES_HP_ELOG_ID_DRC_COUNT:
 340                 hp_elog->_drc_u.drc_count =
 341                                 be32_to_cpu(hp_elog->_drc_u.drc_count);
 342                 break;
 343         case PSERIES_HP_ELOG_ID_DRC_INDEX:
 344                 hp_elog->_drc_u.drc_index =
 345                                 be32_to_cpu(hp_elog->_drc_u.drc_index);
 346                 break;
 347         case PSERIES_HP_ELOG_ID_DRC_IC:
 348                 hp_elog->_drc_u.ic.count =
 349                                 be32_to_cpu(hp_elog->_drc_u.ic.count);
 350                 hp_elog->_drc_u.ic.index =
 351                                 be32_to_cpu(hp_elog->_drc_u.ic.index);
 352         }
 353
 354         switch (hp_elog->resource) {
 355         case PSERIES_HP_ELOG_RESOURCE_MEM:
 356                 rc = dlpar_memory(hp_elog);
 357                 break;
 358         case PSERIES_HP_ELOG_RESOURCE_CPU:
 359                 rc = dlpar_cpu(hp_elog);
 360                 break;
 361         case PSERIES_HP_ELOG_RESOURCE_PMEM:
 362                 rc = dlpar_hp_pmem(hp_elog);
 363                 break;
 364
 365         default:
 366                 pr_warn_ratelimited("Invalid resource (%d) specified\n",
 367                                     hp_elog->resource);
 368                 rc = -EINVAL;
 369         }
 370
 371         return rc;
 372 }
 373
 374 static void pseries_hp_work_fn(struct work_struct *work)
 375 {
 376         struct pseries_hp_work *hp_work =
 377                         container_of(work, struct pseries_hp_work, work);
 378
 379         handle_dlpar_errorlog(hp_work->errlog);
 380
 381         kfree(hp_work->errlog);
 382         kfree(work);
 383 }
 384
 385 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
 386 {
 387         struct pseries_hp_work *work;
 388         struct pseries_hp_errorlog *hp_errlog_copy;
 389
 390         hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
 391         if (!hp_errlog_copy)
 392                 return;
 393
 394         work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
 395         if (work) {
 396                 INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
 397                 work->errlog = hp_errlog_copy;
 398                 queue_work(pseries_hp_wq, (struct work_struct *)work);
 399         } else {
 400                 kfree(hp_errlog_copy);
 401         }
 402 }
 403
 404 static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
 405 {
 406         char *arg;
 407
 408         arg = strsep(cmd, " ");
 409         if (!arg)
 410                 return -EINVAL;
 411
 412         if (sysfs_streq(arg, "memory")) {
 413                 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
 414         } else if (sysfs_streq(arg, "cpu")) {
 415                 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
 416         } else {
 417                 pr_err("Invalid resource specified.\n");
 418                 return -EINVAL;
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
 425 {
 426         char *arg;
 427
 428         arg = strsep(cmd, " ");
 429         if (!arg)
 430                 return -EINVAL;
 431
 432         if (sysfs_streq(arg, "add")) {
 433                 hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
 434         } else if (sysfs_streq(arg, "remove")) {
 435                 hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
 436         } else {
 437                 pr_err("Invalid action specified.\n");
 438                 return -EINVAL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
 445 {
 446         char *arg;
 447         u32 count, index;
 448
 449         arg = strsep(cmd, " ");
 450         if (!arg)
 451                 return -EINVAL;
 452
 453         if (sysfs_streq(arg, "indexed-count")) {
 454                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
 455                 arg = strsep(cmd, " ");
 456                 if (!arg) {
 457                         pr_err("No DRC count specified.\n");
 458                         return -EINVAL;
 459                 }
 460
 461                 if (kstrtou32(arg, 0, &count)) {
 462                         pr_err("Invalid DRC count specified.\n");
 463                         return -EINVAL;
 464                 }
 465
 466                 arg = strsep(cmd, " ");
 467                 if (!arg) {
 468                         pr_err("No DRC Index specified.\n");
 469                         return -EINVAL;
 470                 }
 471
 472                 if (kstrtou32(arg, 0, &index)) {
 473                         pr_err("Invalid DRC Index specified.\n");
 474                         return -EINVAL;
 475                 }
 476
 477                 hp_elog->_drc_u.ic.count = cpu_to_be32(count);
 478                 hp_elog->_drc_u.ic.index = cpu_to_be32(index);
 479         } else if (sysfs_streq(arg, "index")) {
 480                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
 481                 arg = strsep(cmd, " ");
 482                 if (!arg) {
 483                         pr_err("No DRC Index specified.\n");
 484                         return -EINVAL;
 485                 }
 486
 487                 if (kstrtou32(arg, 0, &index)) {
 488                         pr_err("Invalid DRC Index specified.\n");
 489                         return -EINVAL;
 490                 }
 491
 492                 hp_elog->_drc_u.drc_index = cpu_to_be32(index);
 493         } else if (sysfs_streq(arg, "count")) {
 494                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
 495                 arg = strsep(cmd, " ");
 496                 if (!arg) {
 497                         pr_err("No DRC count specified.\n");
 498                         return -EINVAL;
 499                 }
 500
 501                 if (kstrtou32(arg, 0, &count)) {
 502                         pr_err("Invalid DRC count specified.\n");
 503                         return -EINVAL;
 504                 }
 505
 506                 hp_elog->_drc_u.drc_count = cpu_to_be32(count);
 507         } else {
 508                 pr_err("Invalid id_type specified.\n");
 509                 return -EINVAL;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static ssize_t dlpar_store(const struct class *class, const struct class_attribute *attr,
 516                            const char *buf, size_t count)
 517 {
 518         struct pseries_hp_errorlog hp_elog;
 519         char *argbuf;
 520         char *args;
 521         int rc;
 522
 523         args = argbuf = kstrdup(buf, GFP_KERNEL);
 524         if (!argbuf)
 525                 return -ENOMEM;
 526
 527         /*
 528          * Parse out the request from the user, this will be in the form:
 529          * <resource> <action> <id_type> <id>
 530          */
 531         rc = dlpar_parse_resource(&args, &hp_elog);
 532         if (rc)
 533                 goto dlpar_store_out;
 534
 535         rc = dlpar_parse_action(&args, &hp_elog);
 536         if (rc)
 537                 goto dlpar_store_out;
 538
 539         rc = dlpar_parse_id_type(&args, &hp_elog);
 540         if (rc)
 541                 goto dlpar_store_out;
 542
 543         rc = handle_dlpar_errorlog(&hp_elog);
 544
 545 dlpar_store_out:
 546         kfree(argbuf);
 547
 548         if (rc)
 549                 pr_err("Could not handle DLPAR request \"%s\"\n", buf);
 550
 551         return rc ? rc : count;
 552 }
 553
 554 static ssize_t dlpar_show(const struct class *class, const struct class_attribute *attr,
 555                           char *buf)
 556 {
 557         return sprintf(buf, "%s\n", "memory,cpu");
 558 }
 559
 560 static CLASS_ATTR_RW(dlpar);
 561
 562 int __init dlpar_workqueue_init(void)
 563 {
 564         if (pseries_hp_wq)
 565                 return 0;
 566
 567         pseries_hp_wq = alloc_ordered_workqueue("pseries hotplug workqueue", 0);
 568
 569         return pseries_hp_wq ? 0 : -ENOMEM;
 570 }
 571
 572 static int __init dlpar_sysfs_init(void)
 573 {
 574         int rc;
 575
 576         rc = dlpar_workqueue_init();
 577         if (rc)
 578                 return rc;
 579
 580         return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
 581 }
 582 machine_device_initcall(pseries, dlpar_sysfs_init);
 583