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