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/prom.h>
  23 #include <asm/machdep.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/rtas.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         char *data_buf;
 142         int cc_token;
 143         int rc = -1;
 144
 145         cc_token = rtas_token("ibm,configure-connector");
 146         if (cc_token == RTAS_UNKNOWN_SERVICE)
 147                 return NULL;
 148
 149         data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
 150         if (!data_buf)
 151                 return NULL;
 152
 153         ccwa = (struct cc_workarea *)&data_buf[0];
 154         ccwa->drc_index = drc_index;
 155         ccwa->zero = 0;
 156
 157         do {
 158                 /* Since we release the rtas_data_buf lock between configure
 159                  * connector calls we want to re-populate the rtas_data_buffer
 160                  * with the contents of the previous call.
 161                  */
 162                 spin_lock(&rtas_data_buf_lock);
 163
 164                 memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
 165                 rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
 166                 memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
 167
 168                 spin_unlock(&rtas_data_buf_lock);
 169
 170                 if (rtas_busy_delay(rc))
 171                         continue;
 172
 173                 switch (rc) {
 174                 case COMPLETE:
 175                         break;
 176
 177                 case NEXT_SIBLING:
 178                         dn = dlpar_parse_cc_node(ccwa);
 179                         if (!dn)
 180                                 goto cc_error;
 181
 182                         dn->parent = last_dn->parent;
 183                         last_dn->sibling = dn;
 184                         last_dn = dn;
 185                         break;
 186
 187                 case NEXT_CHILD:
 188                         dn = dlpar_parse_cc_node(ccwa);
 189                         if (!dn)
 190                                 goto cc_error;
 191
 192                         if (!first_dn) {
 193                                 dn->parent = parent;
 194                                 first_dn = dn;
 195                         } else {
 196                                 dn->parent = last_dn;
 197                                 if (last_dn)
 198                                         last_dn->child = dn;
 199                         }
 200
 201                         last_dn = dn;
 202                         break;
 203
 204                 case NEXT_PROPERTY:
 205                         property = dlpar_parse_cc_property(ccwa);
 206                         if (!property)
 207                                 goto cc_error;
 208
 209                         if (!last_dn->properties)
 210                                 last_dn->properties = property;
 211                         else
 212                                 last_property->next = property;
 213
 214                         last_property = property;
 215                         break;
 216
 217                 case PREV_PARENT:
 218                         last_dn = last_dn->parent;
 219                         break;
 220
 221                 case MORE_MEMORY:
 222                 case ERR_CFG_USE:
 223                 default:
 224                         printk(KERN_ERR "Unexpected Error (%d) "
 225                                "returned from configure-connector\n", rc);
 226                         goto cc_error;
 227                 }
 228         } while (rc);
 229
 230 cc_error:
 231         kfree(data_buf);
 232
 233         if (rc) {
 234                 if (first_dn)
 235                         dlpar_free_cc_nodes(first_dn);
 236
 237                 return NULL;
 238         }
 239
 240         return first_dn;
 241 }
 242
 243 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
 244 {
 245         int rc;
 246
 247         dn->parent = parent;
 248
 249         rc = of_attach_node(dn);
 250         if (rc) {
 251                 printk(KERN_ERR "Failed to add device node %pOF\n", dn);
 252                 return rc;
 253         }
 254
 255         return 0;
 256 }
 257
 258 int dlpar_detach_node(struct device_node *dn)
 259 {
 260         struct device_node *child;
 261         int rc;
 262
 263         child = of_get_next_child(dn, NULL);
 264         while (child) {
 265                 dlpar_detach_node(child);
 266                 child = of_get_next_child(dn, child);
 267         }
 268
 269         rc = of_detach_node(dn);
 270         if (rc)
 271                 return rc;
 272
 273         of_node_put(dn);
 274
 275         return 0;
 276 }
 277
 278 #define DR_ENTITY_SENSE         9003
 279 #define DR_ENTITY_PRESENT       1
 280 #define DR_ENTITY_UNUSABLE      2
 281 #define ALLOCATION_STATE        9003
 282 #define ALLOC_UNUSABLE          0
 283 #define ALLOC_USABLE            1
 284 #define ISOLATION_STATE         9001
 285 #define ISOLATE                 0
 286 #define UNISOLATE               1
 287
 288 int dlpar_acquire_drc(u32 drc_index)
 289 {
 290         int dr_status, rc;
 291
 292         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 293         if (rc || dr_status != DR_ENTITY_UNUSABLE)
 294                 return -1;
 295
 296         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
 297         if (rc)
 298                 return rc;
 299
 300         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 301         if (rc) {
 302                 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 303                 return rc;
 304         }
 305
 306         return 0;
 307 }
 308
 309 int dlpar_release_drc(u32 drc_index)
 310 {
 311         int dr_status, rc;
 312
 313         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 314         if (rc || dr_status != DR_ENTITY_PRESENT)
 315                 return -1;
 316
 317         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
 318         if (rc)
 319                 return rc;
 320
 321         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 322         if (rc) {
 323                 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 324                 return rc;
 325         }
 326
 327         return 0;
 328 }
 329
 330 int dlpar_unisolate_drc(u32 drc_index)
 331 {
 332         int dr_status, rc;
 333
 334         rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 335         if (rc || dr_status != DR_ENTITY_PRESENT)
 336                 return -1;
 337
 338         rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 339
 340         return 0;
 341 }
 342
 343 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
 344 {
 345         int rc;
 346
 347         /* pseries error logs are in BE format, convert to cpu type */
 348         switch (hp_elog->id_type) {
 349         case PSERIES_HP_ELOG_ID_DRC_COUNT:
 350                 hp_elog->_drc_u.drc_count =
 351                                 be32_to_cpu(hp_elog->_drc_u.drc_count);
 352                 break;
 353         case PSERIES_HP_ELOG_ID_DRC_INDEX:
 354                 hp_elog->_drc_u.drc_index =
 355                                 be32_to_cpu(hp_elog->_drc_u.drc_index);
 356                 break;
 357         case PSERIES_HP_ELOG_ID_DRC_IC:
 358                 hp_elog->_drc_u.ic.count =
 359                                 be32_to_cpu(hp_elog->_drc_u.ic.count);
 360                 hp_elog->_drc_u.ic.index =
 361                                 be32_to_cpu(hp_elog->_drc_u.ic.index);
 362         }
 363
 364         switch (hp_elog->resource) {
 365         case PSERIES_HP_ELOG_RESOURCE_MEM:
 366                 rc = dlpar_memory(hp_elog);
 367                 break;
 368         case PSERIES_HP_ELOG_RESOURCE_CPU:
 369                 rc = dlpar_cpu(hp_elog);
 370                 break;
 371         case PSERIES_HP_ELOG_RESOURCE_PMEM:
 372                 rc = dlpar_hp_pmem(hp_elog);
 373                 break;
 374
 375         default:
 376                 pr_warn_ratelimited("Invalid resource (%d) specified\n",
 377                                     hp_elog->resource);
 378                 rc = -EINVAL;
 379         }
 380
 381         return rc;
 382 }
 383
 384 static void pseries_hp_work_fn(struct work_struct *work)
 385 {
 386         struct pseries_hp_work *hp_work =
 387                         container_of(work, struct pseries_hp_work, work);
 388
 389         handle_dlpar_errorlog(hp_work->errlog);
 390
 391         kfree(hp_work->errlog);
 392         kfree((void *)work);
 393 }
 394
 395 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
 396 {
 397         struct pseries_hp_work *work;
 398         struct pseries_hp_errorlog *hp_errlog_copy;
 399
 400         hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
 401         if (!hp_errlog_copy)
 402                 return;
 403
 404         work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
 405         if (work) {
 406                 INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
 407                 work->errlog = hp_errlog_copy;
 408                 queue_work(pseries_hp_wq, (struct work_struct *)work);
 409         } else {
 410                 kfree(hp_errlog_copy);
 411         }
 412 }
 413
 414 static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
 415 {
 416         char *arg;
 417
 418         arg = strsep(cmd, " ");
 419         if (!arg)
 420                 return -EINVAL;
 421
 422         if (sysfs_streq(arg, "memory")) {
 423                 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
 424         } else if (sysfs_streq(arg, "cpu")) {
 425                 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
 426         } else {
 427                 pr_err("Invalid resource specified.\n");
 428                 return -EINVAL;
 429         }
 430
 431         return 0;
 432 }
 433
 434 static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
 435 {
 436         char *arg;
 437
 438         arg = strsep(cmd, " ");
 439         if (!arg)
 440                 return -EINVAL;
 441
 442         if (sysfs_streq(arg, "add")) {
 443                 hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
 444         } else if (sysfs_streq(arg, "remove")) {
 445                 hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
 446         } else {
 447                 pr_err("Invalid action specified.\n");
 448                 return -EINVAL;
 449         }
 450
 451         return 0;
 452 }
 453
 454 static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
 455 {
 456         char *arg;
 457         u32 count, index;
 458
 459         arg = strsep(cmd, " ");
 460         if (!arg)
 461                 return -EINVAL;
 462
 463         if (sysfs_streq(arg, "indexed-count")) {
 464                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
 465                 arg = strsep(cmd, " ");
 466                 if (!arg) {
 467                         pr_err("No DRC count specified.\n");
 468                         return -EINVAL;
 469                 }
 470
 471                 if (kstrtou32(arg, 0, &count)) {
 472                         pr_err("Invalid DRC count specified.\n");
 473                         return -EINVAL;
 474                 }
 475
 476                 arg = strsep(cmd, " ");
 477                 if (!arg) {
 478                         pr_err("No DRC Index specified.\n");
 479                         return -EINVAL;
 480                 }
 481
 482                 if (kstrtou32(arg, 0, &index)) {
 483                         pr_err("Invalid DRC Index specified.\n");
 484                         return -EINVAL;
 485                 }
 486
 487                 hp_elog->_drc_u.ic.count = cpu_to_be32(count);
 488                 hp_elog->_drc_u.ic.index = cpu_to_be32(index);
 489         } else if (sysfs_streq(arg, "index")) {
 490                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
 491                 arg = strsep(cmd, " ");
 492                 if (!arg) {
 493                         pr_err("No DRC Index specified.\n");
 494                         return -EINVAL;
 495                 }
 496
 497                 if (kstrtou32(arg, 0, &index)) {
 498                         pr_err("Invalid DRC Index specified.\n");
 499                         return -EINVAL;
 500                 }
 501
 502                 hp_elog->_drc_u.drc_index = cpu_to_be32(index);
 503         } else if (sysfs_streq(arg, "count")) {
 504                 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
 505                 arg = strsep(cmd, " ");
 506                 if (!arg) {
 507                         pr_err("No DRC count specified.\n");
 508                         return -EINVAL;
 509                 }
 510
 511                 if (kstrtou32(arg, 0, &count)) {
 512                         pr_err("Invalid DRC count specified.\n");
 513                         return -EINVAL;
 514                 }
 515
 516                 hp_elog->_drc_u.drc_count = cpu_to_be32(count);
 517         } else {
 518                 pr_err("Invalid id_type specified.\n");
 519                 return -EINVAL;
 520         }
 521
 522         return 0;
 523 }
 524
 525 static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
 526                            const char *buf, size_t count)
 527 {
 528         struct pseries_hp_errorlog hp_elog;
 529         char *argbuf;
 530         char *args;
 531         int rc;
 532
 533         args = argbuf = kstrdup(buf, GFP_KERNEL);
 534         if (!argbuf)
 535                 return -ENOMEM;
 536
 537         /*
 538          * Parse out the request from the user, this will be in the form:
 539          * <resource> <action> <id_type> <id>
 540          */
 541         rc = dlpar_parse_resource(&args, &hp_elog);
 542         if (rc)
 543                 goto dlpar_store_out;
 544
 545         rc = dlpar_parse_action(&args, &hp_elog);
 546         if (rc)
 547                 goto dlpar_store_out;
 548
 549         rc = dlpar_parse_id_type(&args, &hp_elog);
 550         if (rc)
 551                 goto dlpar_store_out;
 552
 553         rc = handle_dlpar_errorlog(&hp_elog);
 554
 555 dlpar_store_out:
 556         kfree(argbuf);
 557
 558         if (rc)
 559                 pr_err("Could not handle DLPAR request \"%s\"\n", buf);
 560
 561         return rc ? rc : count;
 562 }
 563
 564 static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
 565                           char *buf)
 566 {
 567         return sprintf(buf, "%s\n", "memory,cpu");
 568 }
 569
 570 static CLASS_ATTR_RW(dlpar);
 571
 572 int __init dlpar_workqueue_init(void)
 573 {
 574         if (pseries_hp_wq)
 575                 return 0;
 576
 577         pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
 578                         WQ_UNBOUND, 1);
 579
 580         return pseries_hp_wq ? 0 : -ENOMEM;
 581 }
 582
 583 static int __init dlpar_sysfs_init(void)
 584 {
 585         int rc;
 586
 587         rc = dlpar_workqueue_init();
 588         if (rc)
 589                 return rc;
 590
 591         return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
 592 }
 593 machine_device_initcall(pseries, dlpar_sysfs_init);
 594