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 CALL_AGAIN      -2
 131 #define ERR_CFG_USE     -9003
 132
 133 struct device_node *dlpar_configure_connector(__be32 drc_index,
 134                                               struct device_node *parent)
 135 {
 136         struct device_node *dn;
 137         struct device_node *first_dn = NULL;
 138         struct device_node *last_dn = NULL;
 139         struct property *property;
 140         struct property *last_property = NULL;
 141         struct cc_workarea *ccwa;
 142         char *data_buf;
 143         int cc_token;
 144         int rc = -1;
 145
 146         cc_token = rtas_token("ibm,configure-connector");
 147         if (cc_token == RTAS_UNKNOWN_SERVICE)
 148                 return NULL;
 149
 150         data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
 151         if (!data_buf)
 152                 return NULL;
 153
 154         ccwa = (struct cc_workarea *)&data_buf[0];
 155         ccwa->drc_index = drc_index;
 156         ccwa->zero = 0;
 157
 158         do {
 159                 /* Since we release the rtas_data_buf lock between configure
 160                  * connector calls we want to re-populate the rtas_data_buffer
 161                  * with the contents of the previous call.
 162                  */
 163                 spin_lock(&rtas_data_buf_lock);
 164
 165                 memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
 166                 rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
 167                 memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
 168
 169                 spin_unlock(&rtas_data_buf_lock);
 170
 171                 switch (rc) {
 172                 case COMPLETE:
 173                         break;
 174
 175                 case NEXT_SIBLING:
 176                         dn = dlpar_parse_cc_node(ccwa);
 177                         if (!dn)
 178                                 goto cc_error;
 179
 180                         dn->parent = last_dn->parent;
 181                         last_dn->sibling = dn;
 182                         last_dn = dn;
 183                         break;
 184
 185                 case NEXT_CHILD:
 186                         dn = dlpar_parse_cc_node(ccwa);
 187                         if (!dn)
 188                                 goto cc_error;
 189
 190                         if (!first_dn) {
 191                                 dn->parent = parent;
 192                                 first_dn = dn;
 193                         } else {
 194                                 dn->parent = last_dn;
 195                                 if (last_dn)
 196                                         last_dn->child = dn;
 197                         }
 198
 199                         last_dn = dn;
 200                         break;
 201
 202                 case NEXT_PROPERTY:
 203                         property = dlpar_parse_cc_property(ccwa);
 204                         if (!property)
 205                                 goto cc_error;
 206
 207                         if (!last_dn->properties)
 208                                 last_dn->properties = property;
 209                         else
 210                                 last_property->next = property;
 211
 212                         last_property = property;
 213                         break;
 214
 215                 case PREV_PARENT:
 216                         last_dn = last_dn->parent;
 217                         break;
 218
 219                 case CALL_AGAIN:
 220                         break;
 221
 222                 case MORE_MEMORY:
 223                 case ERR_CFG_USE:
 224                 default:
 225                         printk(KERN_ERR "Unexpected Error (%d) "
 226                                "returned from configure-connector\n", rc);
 227                         goto cc_error;
 228                 }
 229         } while (rc);
 230
 231 cc_error:
 232         kfree(data_buf);
 233
 234         if (rc) {
 235                 if (first_dn)
 236                         dlpar_free_cc_nodes(first_dn);
 237
 238                 return NULL;
 239         }
 240
 241         return first_dn;
 242 }
 243
 244 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
 245 {
 246         int rc;
 247
 248         dn->parent = parent;
 249
 250         rc = of_attach_node(dn);
 251         if (rc) {
 252                 printk(KERN_ERR "Failed to add device node %pOF\n", dn);
 253                 return rc;
 254         }
 255
 256         return 0;
 257 }
 258
 259 int dlpar_detach_node(struct device_node *dn)
 260 {
 261         struct device_node *child;
 262         int rc;
 263
 264         child = of_get_next_child(dn, NULL);
 265         while (child) {
 266                 dlpar_detach_node(child);
 267                 child = of_get_next_child(dn, child);
 268         }
 269
 270         rc = of_detach_node(dn);
 271         if (rc)
 272                 return rc;
 273
 274         of_node_put(dn);
 275
 276         return 0;
 277 }
 278
 279 #define DR_ENTITY_SENSE         9003
 280 #define DR_ENTITY_PRESENT       1
 281 #define DR_ENTITY_UNUSABLE      2
 282 #define ALLOCATION_STATE        9003
 283 #define ALLOC_UNUSABLE          0
 284 #define ALLOC_USABLE            1
 285 #define ISOLATION_STATE         9001
 286 #define ISOLATE                 0
 287 #define UNISOLATE               1
 288
 289 int dlpar_acquire_drc(u32 drc_index)
 290 {
 291         int dr_status, rc;
 292
 293         rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
 294                        DR_ENTITY_SENSE, drc_index);
 295         if (rc || dr_status != DR_ENTITY_UNUSABLE)
 296                 return -1;
 297
 298         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
 299         if (rc)
 300                 return rc;
 301
 302         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 303         if (rc) {
 304                 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 305                 return rc;
 306         }
 307
 308         return 0;
 309 }
 310
 311 int dlpar_release_drc(u32 drc_index)
 312 {
 313         int dr_status, rc;
 314
 315         rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
 316                        DR_ENTITY_SENSE, drc_index);
 317         if (rc || dr_status != DR_ENTITY_PRESENT)
 318                 return -1;
 319
 320         rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
 321         if (rc)
 322                 return rc;
 323
 324         rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
 325         if (rc) {
 326                 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
 327                 return rc;
 328         }
 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((void *)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(struct class *class, 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                 pr_info("Could not allocate resources for DLPAR operation\n");
 526                 return -ENOMEM;
 527         }
 528
 529         /*
 530          * Parse out the request from the user, this will be in the form:
 531          * <resource> <action> <id_type> <id>
 532          */
 533         rc = dlpar_parse_resource(&args, &hp_elog);
 534         if (rc)
 535                 goto dlpar_store_out;
 536
 537         rc = dlpar_parse_action(&args, &hp_elog);
 538         if (rc)
 539                 goto dlpar_store_out;
 540
 541         rc = dlpar_parse_id_type(&args, &hp_elog);
 542         if (rc)
 543                 goto dlpar_store_out;
 544
 545         rc = handle_dlpar_errorlog(&hp_elog);
 546
 547 dlpar_store_out:
 548         kfree(argbuf);
 549
 550         if (rc)
 551                 pr_err("Could not handle DLPAR request \"%s\"\n", buf);
 552
 553         return rc ? rc : count;
 554 }
 555
 556 static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
 557                           char *buf)
 558 {
 559         return sprintf(buf, "%s\n", "memory,cpu");
 560 }
 561
 562 static CLASS_ATTR_RW(dlpar);
 563
 564 int __init dlpar_workqueue_init(void)
 565 {
 566         if (pseries_hp_wq)
 567                 return 0;
 568
 569         pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
 570                         WQ_UNBOUND, 1);
 571
 572         return pseries_hp_wq ? 0 : -ENOMEM;
 573 }
 574
 575 static int __init dlpar_sysfs_init(void)
 576 {
 577         int rc;
 578
 579         rc = dlpar_workqueue_init();
 580         if (rc)
 581                 return rc;
 582
 583         return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
 584 }
 585 machine_device_initcall(pseries, dlpar_sysfs_init);
 586