drivers/bus/dpaa/dpaa_bus.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  *   Copyright 2017-2019 NXP
   4  *
   5  */
   6 /* System headers */
   7 #include <stdio.h>
   8 #include <inttypes.h>
   9 #include <unistd.h>
  10 #include <limits.h>
  11 #include <sched.h>
  12 #include <signal.h>
  13 #include <pthread.h>
  14 #include <sys/types.h>
  15 #include <sys/syscall.h>
  16
  17 #include <rte_byteorder.h>
  18 #include <rte_common.h>
  19 #include <rte_interrupts.h>
  20 #include <rte_log.h>
  21 #include <rte_debug.h>
  22 #include <rte_atomic.h>
  23 #include <rte_branch_prediction.h>
  24 #include <rte_memory.h>
  25 #include <rte_tailq.h>
  26 #include <rte_eal.h>
  27 #include <rte_alarm.h>
  28 #include <rte_ether.h>
  29 #include <rte_ethdev_driver.h>
  30 #include <rte_malloc.h>
  31 #include <rte_ring.h>
  32 #include <rte_bus.h>
  33 #include <rte_mbuf_pool_ops.h>
  34
  35 #include <dpaa_of.h>
  36 #include <rte_dpaa_bus.h>
  37 #include <rte_dpaa_logs.h>
  38 #include <dpaax_iova_table.h>
  39
  40 #include <fsl_usd.h>
  41 #include <fsl_qman.h>
  42 #include <fsl_bman.h>
  43 #include <netcfg.h>
  44
  45 static struct rte_dpaa_bus rte_dpaa_bus;
  46 struct netcfg_info *dpaa_netcfg;
  47
  48 /* define a variable to hold the portal_key, once created.*/
  49 static pthread_key_t dpaa_portal_key;
  50
  51 unsigned int dpaa_svr_family;
  52
  53 #define FSL_DPAA_BUS_NAME       dpaa_bus
  54
  55 RTE_DEFINE_PER_LCORE(bool, dpaa_io);
  56 RTE_DEFINE_PER_LCORE(struct dpaa_portal_dqrr, held_bufs);
  57
  58 struct fm_eth_port_cfg *
  59 dpaa_get_eth_port_cfg(int dev_id)
  60 {
  61         return &dpaa_netcfg->port_cfg[dev_id];
  62 }
  63
  64 static int
  65 compare_dpaa_devices(struct rte_dpaa_device *dev1,
  66                      struct rte_dpaa_device *dev2)
  67 {
  68         int comp = 0;
  69
  70         /* Segragating ETH from SEC devices */
  71         if (dev1->device_type > dev2->device_type)
  72                 comp = 1;
  73         else if (dev1->device_type < dev2->device_type)
  74                 comp = -1;
  75         else
  76                 comp = 0;
  77
  78         if ((comp != 0) || (dev1->device_type != FSL_DPAA_ETH))
  79                 return comp;
  80
  81         if (dev1->id.fman_id > dev2->id.fman_id) {
  82                 comp = 1;
  83         } else if (dev1->id.fman_id < dev2->id.fman_id) {
  84                 comp = -1;
  85         } else {
  86                 /* FMAN ids match, check for mac_id */
  87                 if (dev1->id.mac_id > dev2->id.mac_id)
  88                         comp = 1;
  89                 else if (dev1->id.mac_id < dev2->id.mac_id)
  90                         comp = -1;
  91                 else
  92                         comp = 0;
  93         }
  94
  95         return comp;
  96 }
  97
  98 static inline void
  99 dpaa_add_to_device_list(struct rte_dpaa_device *newdev)
 100 {
 101         int comp, inserted = 0;
 102         struct rte_dpaa_device *dev = NULL;
 103         struct rte_dpaa_device *tdev = NULL;
 104
 105         TAILQ_FOREACH_SAFE(dev, &rte_dpaa_bus.device_list, next, tdev) {
 106                 comp = compare_dpaa_devices(newdev, dev);
 107                 if (comp < 0) {
 108                         TAILQ_INSERT_BEFORE(dev, newdev, next);
 109                         inserted = 1;
 110                         break;
 111                 }
 112         }
 113
 114         if (!inserted)
 115                 TAILQ_INSERT_TAIL(&rte_dpaa_bus.device_list, newdev, next);
 116 }
 117
 118 /*
 119  * Reads the SEC device from DTS
 120  * Returns -1 if SEC devices not available, 0 otherwise
 121  */
 122 static inline int
 123 dpaa_sec_available(void)
 124 {
 125         const struct device_node *caam_node;
 126
 127         for_each_compatible_node(caam_node, NULL, "fsl,sec-v4.0") {
 128                 return 0;
 129         }
 130
 131         return -1;
 132 }
 133
 134 static void dpaa_clean_device_list(void);
 135
 136 static struct rte_devargs *
 137 dpaa_devargs_lookup(struct rte_dpaa_device *dev)
 138 {
 139         struct rte_devargs *devargs;
 140         char dev_name[32];
 141
 142         RTE_EAL_DEVARGS_FOREACH("dpaa_bus", devargs) {
 143                 devargs->bus->parse(devargs->name, &dev_name);
 144                 if (strcmp(dev_name, dev->device.name) == 0) {
 145                         DPAA_BUS_INFO("**Devargs matched %s", dev_name);
 146                         return devargs;
 147                 }
 148         }
 149         return NULL;
 150 }
 151
 152 static int
 153 dpaa_create_device_list(void)
 154 {
 155         int i;
 156         int ret;
 157         struct rte_dpaa_device *dev;
 158         struct fm_eth_port_cfg *cfg;
 159         struct fman_if *fman_intf;
 160
 161         /* Creating Ethernet Devices */
 162         for (i = 0; i < dpaa_netcfg->num_ethports; i++) {
 163                 dev = calloc(1, sizeof(struct rte_dpaa_device));
 164                 if (!dev) {
 165                         DPAA_BUS_LOG(ERR, "Failed to allocate ETH devices");
 166                         ret = -ENOMEM;
 167                         goto cleanup;
 168                 }
 169
 170                 dev->device.bus = &rte_dpaa_bus.bus;
 171
 172                 cfg = &dpaa_netcfg->port_cfg[i];
 173                 fman_intf = cfg->fman_if;
 174
 175                 /* Device identifiers */
 176                 dev->id.fman_id = fman_intf->fman_idx + 1;
 177                 dev->id.mac_id = fman_intf->mac_idx;
 178                 dev->device_type = FSL_DPAA_ETH;
 179                 dev->id.dev_id = i;
 180
 181                 /* Create device name */
 182                 memset(dev->name, 0, RTE_ETH_NAME_MAX_LEN);
 183                 sprintf(dev->name, "fm%d-mac%d", (fman_intf->fman_idx + 1),
 184                         fman_intf->mac_idx);
 185                 DPAA_BUS_LOG(INFO, "%s netdev added", dev->name);
 186                 dev->device.name = dev->name;
 187                 dev->device.devargs = dpaa_devargs_lookup(dev);
 188
 189                 dpaa_add_to_device_list(dev);
 190         }
 191
 192         rte_dpaa_bus.device_count = i;
 193
 194         /* Unlike case of ETH, RTE_LIBRTE_DPAA_MAX_CRYPTODEV SEC devices are
 195          * constantly created only if "sec" property is found in the device
 196          * tree. Logically there is no limit for number of devices (QI
 197          * interfaces) that can be created.
 198          */
 199
 200         if (dpaa_sec_available()) {
 201                 DPAA_BUS_LOG(INFO, "DPAA SEC devices are not available");
 202                 return 0;
 203         }
 204
 205         /* Creating SEC Devices */
 206         for (i = 0; i < RTE_LIBRTE_DPAA_MAX_CRYPTODEV; i++) {
 207                 dev = calloc(1, sizeof(struct rte_dpaa_device));
 208                 if (!dev) {
 209                         DPAA_BUS_LOG(ERR, "Failed to allocate SEC devices");
 210                         ret = -1;
 211                         goto cleanup;
 212                 }
 213
 214                 dev->device_type = FSL_DPAA_CRYPTO;
 215                 dev->id.dev_id = rte_dpaa_bus.device_count + i;
 216
 217                 /* Even though RTE_CRYPTODEV_NAME_MAX_LEN is valid length of
 218                  * crypto PMD, using RTE_ETH_NAME_MAX_LEN as that is the size
 219                  * allocated for dev->name/
 220                  */
 221                 memset(dev->name, 0, RTE_ETH_NAME_MAX_LEN);
 222                 sprintf(dev->name, "dpaa_sec-%d", i+1);
 223                 DPAA_BUS_LOG(INFO, "%s cryptodev added", dev->name);
 224                 dev->device.name = dev->name;
 225                 dev->device.devargs = dpaa_devargs_lookup(dev);
 226
 227                 dpaa_add_to_device_list(dev);
 228         }
 229
 230         rte_dpaa_bus.device_count += i;
 231
 232         return 0;
 233
 234 cleanup:
 235         dpaa_clean_device_list();
 236         return ret;
 237 }
 238
 239 static void
 240 dpaa_clean_device_list(void)
 241 {
 242         struct rte_dpaa_device *dev = NULL;
 243         struct rte_dpaa_device *tdev = NULL;
 244
 245         TAILQ_FOREACH_SAFE(dev, &rte_dpaa_bus.device_list, next, tdev) {
 246                 TAILQ_REMOVE(&rte_dpaa_bus.device_list, dev, next);
 247                 free(dev);
 248                 dev = NULL;
 249         }
 250 }
 251
 252 int rte_dpaa_portal_init(void *arg)
 253 {
 254         unsigned int cpu, lcore = rte_lcore_id();
 255         int ret;
 256         struct dpaa_portal *dpaa_io_portal;
 257
 258         BUS_INIT_FUNC_TRACE();
 259
 260         if ((size_t)arg == 1 || lcore == LCORE_ID_ANY)
 261                 lcore = rte_get_master_lcore();
 262         else
 263                 if (lcore >= RTE_MAX_LCORE)
 264                         return -1;
 265
 266         cpu = rte_lcore_to_cpu_id(lcore);
 267
 268         /* Initialise bman thread portals */
 269         ret = bman_thread_init();
 270         if (ret) {
 271                 DPAA_BUS_LOG(ERR, "bman_thread_init failed on core %u"
 272                              " (lcore=%u) with ret: %d", cpu, lcore, ret);
 273                 return ret;
 274         }
 275
 276         DPAA_BUS_LOG(DEBUG, "BMAN thread initialized - CPU=%d lcore=%d",
 277                      cpu, lcore);
 278
 279         /* Initialise qman thread portals */
 280         ret = qman_thread_init();
 281         if (ret) {
 282                 DPAA_BUS_LOG(ERR, "qman_thread_init failed on core %u"
 283                             " (lcore=%u) with ret: %d", cpu, lcore, ret);
 284                 bman_thread_finish();
 285                 return ret;
 286         }
 287
 288         DPAA_BUS_LOG(DEBUG, "QMAN thread initialized - CPU=%d lcore=%d",
 289                      cpu, lcore);
 290
 291         dpaa_io_portal = rte_malloc(NULL, sizeof(struct dpaa_portal),
 292                                     RTE_CACHE_LINE_SIZE);
 293         if (!dpaa_io_portal) {
 294                 DPAA_BUS_LOG(ERR, "Unable to allocate memory");
 295                 bman_thread_finish();
 296                 qman_thread_finish();
 297                 return -ENOMEM;
 298         }
 299
 300         dpaa_io_portal->qman_idx = qman_get_portal_index();
 301         dpaa_io_portal->bman_idx = bman_get_portal_index();
 302         dpaa_io_portal->tid = syscall(SYS_gettid);
 303
 304         ret = pthread_setspecific(dpaa_portal_key, (void *)dpaa_io_portal);
 305         if (ret) {
 306                 DPAA_BUS_LOG(ERR, "pthread_setspecific failed on core %u"
 307                              " (lcore=%u) with ret: %d", cpu, lcore, ret);
 308                 dpaa_portal_finish(NULL);
 309
 310                 return ret;
 311         }
 312
 313         RTE_PER_LCORE(dpaa_io) = true;
 314
 315         DPAA_BUS_LOG(DEBUG, "QMAN thread initialized");
 316
 317         return 0;
 318 }
 319
 320 int
 321 rte_dpaa_portal_fq_init(void *arg, struct qman_fq *fq)
 322 {
 323         /* Affine above created portal with channel*/
 324         u32 sdqcr;
 325         int ret;
 326
 327         if (unlikely(!RTE_PER_LCORE(dpaa_io))) {
 328                 ret = rte_dpaa_portal_init(arg);
 329                 if (ret < 0) {
 330                         DPAA_BUS_LOG(ERR, "portal initialization failure");
 331                         return ret;
 332                 }
 333         }
 334
 335         /* Initialise qman specific portals */
 336         ret = fsl_qman_fq_portal_init(fq->qp);
 337         if (ret) {
 338                 DPAA_BUS_LOG(ERR, "Unable to init fq portal");
 339                 return -1;
 340         }
 341
 342         sdqcr = QM_SDQCR_CHANNELS_POOL_CONV(fq->ch_id);
 343         qman_static_dequeue_add(sdqcr, fq->qp);
 344
 345         return 0;
 346 }
 347
 348 int rte_dpaa_portal_fq_close(struct qman_fq *fq)
 349 {
 350         return fsl_qman_fq_portal_destroy(fq->qp);
 351 }
 352
 353 void
 354 dpaa_portal_finish(void *arg)
 355 {
 356         struct dpaa_portal *dpaa_io_portal = (struct dpaa_portal *)arg;
 357
 358         if (!dpaa_io_portal) {
 359                 DPAA_BUS_LOG(DEBUG, "Portal already cleaned");
 360                 return;
 361         }
 362
 363         bman_thread_finish();
 364         qman_thread_finish();
 365
 366         pthread_setspecific(dpaa_portal_key, NULL);
 367
 368         rte_free(dpaa_io_portal);
 369         dpaa_io_portal = NULL;
 370
 371         RTE_PER_LCORE(dpaa_io) = false;
 372 }
 373
 374 static int
 375 rte_dpaa_bus_parse(const char *name, void *out_name)
 376 {
 377         int i, j;
 378         int max_fman = 2, max_macs = 16;
 379         char *dup_name;
 380         char *sep = NULL;
 381
 382         /* There are two ways of passing device name, with and without
 383          * separator. "dpaa_bus:fm1-mac3" with separator, and "fm1-mac3"
 384          * without separator. Both need to be handled.
 385          * It is also possible that "name=fm1-mac3" is passed along.
 386          */
 387         DPAA_BUS_DEBUG("Parse device name (%s)", name);
 388
 389         /* Check for dpaa_bus:fm1-mac3 style */
 390         dup_name = strdup(name);
 391         sep = strchr(dup_name, ':');
 392         if (!sep)
 393                 /* If not, check for name=fm1-mac3 style */
 394                 sep = strchr(dup_name, '=');
 395
 396         if (sep)
 397                 /* jump over the seprator */
 398                 sep = (char *) (sep + 1);
 399         else
 400                 sep = dup_name;
 401
 402         for (i = 0; i < max_fman; i++) {
 403                 for (j = 0; j < max_macs; j++) {
 404                         char fm_name[16];
 405                         snprintf(fm_name, 16, "fm%d-mac%d", i, j);
 406                         if (strcmp(fm_name, sep) == 0) {
 407                                 if (out_name)
 408                                         strcpy(out_name, sep);
 409                                 free(dup_name);
 410                                 return 0;
 411                         }
 412                 }
 413         }
 414
 415         for (i = 0; i < RTE_LIBRTE_DPAA_MAX_CRYPTODEV; i++) {
 416                 char sec_name[16];
 417
 418                 snprintf(sec_name, 16, "dpaa_sec-%d", i+1);
 419                 if (strcmp(sec_name, sep) == 0) {
 420                         if (out_name)
 421                                 strcpy(out_name, sep);
 422                         free(dup_name);
 423                         return 0;
 424                 }
 425         }
 426
 427         free(dup_name);
 428         return -EINVAL;
 429 }
 430
 431 #define DPAA_DEV_PATH1 "/sys/devices/platform/soc/soc:fsl,dpaa"
 432 #define DPAA_DEV_PATH2 "/sys/devices/platform/fsl,dpaa"
 433
 434 static int
 435 rte_dpaa_bus_scan(void)
 436 {
 437         int ret;
 438
 439         BUS_INIT_FUNC_TRACE();
 440
 441         if ((access(DPAA_DEV_PATH1, F_OK) != 0) &&
 442             (access(DPAA_DEV_PATH2, F_OK) != 0)) {
 443                 RTE_LOG(DEBUG, EAL, "DPAA Bus not present. Skipping.\n");
 444                 return 0;
 445         }
 446
 447         if (rte_dpaa_bus.detected)
 448                 return 0;
 449
 450         rte_dpaa_bus.detected = 1;
 451
 452         /* create the key, supplying a function that'll be invoked
 453          * when a portal affined thread will be deleted.
 454          */
 455         ret = pthread_key_create(&dpaa_portal_key, dpaa_portal_finish);
 456         if (ret) {
 457                 DPAA_BUS_LOG(DEBUG, "Unable to create pthread key. (%d)", ret);
 458                 dpaa_clean_device_list();
 459                 return ret;
 460         }
 461
 462         return 0;
 463 }
 464
 465 /* register a dpaa bus based dpaa driver */
 466 void
 467 rte_dpaa_driver_register(struct rte_dpaa_driver *driver)
 468 {
 469         RTE_VERIFY(driver);
 470
 471         BUS_INIT_FUNC_TRACE();
 472
 473         TAILQ_INSERT_TAIL(&rte_dpaa_bus.driver_list, driver, next);
 474         /* Update Bus references */
 475         driver->dpaa_bus = &rte_dpaa_bus;
 476 }
 477
 478 /* un-register a dpaa bus based dpaa driver */
 479 void
 480 rte_dpaa_driver_unregister(struct rte_dpaa_driver *driver)
 481 {
 482         struct rte_dpaa_bus *dpaa_bus;
 483
 484         BUS_INIT_FUNC_TRACE();
 485
 486         dpaa_bus = driver->dpaa_bus;
 487
 488         TAILQ_REMOVE(&dpaa_bus->driver_list, driver, next);
 489         /* Update Bus references */
 490         driver->dpaa_bus = NULL;
 491 }
 492
 493 static int
 494 rte_dpaa_device_match(struct rte_dpaa_driver *drv,
 495                       struct rte_dpaa_device *dev)
 496 {
 497         if (!drv || !dev) {
 498                 DPAA_BUS_DEBUG("Invalid drv or dev received.");
 499                 return -1;
 500         }
 501
 502         if (drv->drv_type == dev->device_type)
 503                 return 0;
 504
 505         return -1;
 506 }
 507
 508 static int
 509 rte_dpaa_bus_dev_build(void)
 510 {
 511         int ret;
 512
 513         /* Load the device-tree driver */
 514         ret = of_init();
 515         if (ret) {
 516                 DPAA_BUS_LOG(ERR, "of_init failed with ret: %d", ret);
 517                 return -1;
 518         }
 519
 520         /* Get the interface configurations from device-tree */
 521         dpaa_netcfg = netcfg_acquire();
 522         if (!dpaa_netcfg) {
 523                 DPAA_BUS_LOG(ERR, "netcfg_acquire failed");
 524                 return -EINVAL;
 525         }
 526
 527         RTE_LOG(NOTICE, EAL, "DPAA Bus Detected\n");
 528
 529         if (!dpaa_netcfg->num_ethports) {
 530                 DPAA_BUS_LOG(INFO, "no network interfaces available");
 531                 /* This is not an error */
 532                 return 0;
 533         }
 534
 535 #ifdef RTE_LIBRTE_DPAA_DEBUG_DRIVER
 536         dump_netcfg(dpaa_netcfg);
 537 #endif
 538
 539         DPAA_BUS_LOG(DEBUG, "Number of ethernet devices = %d",
 540                      dpaa_netcfg->num_ethports);
 541         ret = dpaa_create_device_list();
 542         if (ret) {
 543                 DPAA_BUS_LOG(ERR, "Unable to create device list. (%d)", ret);
 544                 return ret;
 545         }
 546         return 0;
 547 }
 548
 549 static int
 550 rte_dpaa_bus_probe(void)
 551 {
 552         int ret = -1;
 553         struct rte_dpaa_device *dev;
 554         struct rte_dpaa_driver *drv;
 555         FILE *svr_file = NULL;
 556         unsigned int svr_ver;
 557         int probe_all = rte_dpaa_bus.bus.conf.scan_mode != RTE_BUS_SCAN_WHITELIST;
 558         static int process_once;
 559
 560         /* If DPAA bus is not present nothing needs to be done */
 561         if (!rte_dpaa_bus.detected)
 562                 return 0;
 563
 564         /* Device list creation is only done once */
 565         if (!process_once) {
 566                 rte_dpaa_bus_dev_build();
 567                 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 568                         /* One time load of Qman/Bman drivers */
 569                         ret = qman_global_init();
 570                         if (ret) {
 571                                 DPAA_BUS_ERR("QMAN initialization failed: %d",
 572                                              ret);
 573                                 return ret;
 574                         }
 575                         ret = bman_global_init();
 576                         if (ret) {
 577                                 DPAA_BUS_ERR("BMAN initialization failed: %d",
 578                                              ret);
 579                                 return ret;
 580                         }
 581                 }
 582         }
 583         process_once = 1;
 584
 585         /* If no device present on DPAA bus nothing needs to be done */
 586         if (TAILQ_EMPTY(&rte_dpaa_bus.device_list))
 587                 return 0;
 588
 589         svr_file = fopen(DPAA_SOC_ID_FILE, "r");
 590         if (svr_file) {
 591                 if (fscanf(svr_file, "svr:%x", &svr_ver) > 0)
 592                         dpaa_svr_family = svr_ver & SVR_MASK;
 593                 fclose(svr_file);
 594         }
 595
 596         /* And initialize the PA->VA translation table */
 597         dpaax_iova_table_populate();
 598
 599         /* For each registered driver, and device, call the driver->probe */
 600         TAILQ_FOREACH(dev, &rte_dpaa_bus.device_list, next) {
 601                 TAILQ_FOREACH(drv, &rte_dpaa_bus.driver_list, next) {
 602                         ret = rte_dpaa_device_match(drv, dev);
 603                         if (ret)
 604                                 continue;
 605
 606                         if (rte_dev_is_probed(&dev->device))
 607                                 continue;
 608
 609                         if (!drv->probe ||
 610                             (dev->device.devargs &&
 611                             dev->device.devargs->policy == RTE_DEV_BLACKLISTED))
 612                                 continue;
 613
 614                         if (probe_all ||
 615                             (dev->device.devargs &&
 616                             dev->device.devargs->policy ==
 617                             RTE_DEV_WHITELISTED)) {
 618                                 ret = drv->probe(drv, dev);
 619                                 if (ret) {
 620                                         DPAA_BUS_ERR("unable to probe:%s",
 621                                                      dev->name);
 622                                 } else {
 623                                         dev->driver = drv;
 624                                         dev->device.driver = &drv->driver;
 625                                 }
 626                         }
 627                         break;
 628                 }
 629         }
 630
 631         /* Register DPAA mempool ops only if any DPAA device has
 632          * been detected.
 633          */
 634         rte_mbuf_set_platform_mempool_ops(DPAA_MEMPOOL_OPS_NAME);
 635
 636         return 0;
 637 }
 638
 639 static struct rte_device *
 640 rte_dpaa_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
 641                      const void *data)
 642 {
 643         struct rte_dpaa_device *dev;
 644         const struct rte_dpaa_device *dstart;
 645
 646         /* find_device is called with 'data' as an opaque object - just call
 647          * cmp with this and each device object on bus.
 648          */
 649
 650         if (start != NULL) {
 651                 dstart = RTE_DEV_TO_DPAA_CONST(start);
 652                 dev = TAILQ_NEXT(dstart, next);
 653         } else {
 654                 dev = TAILQ_FIRST(&rte_dpaa_bus.device_list);
 655         }
 656
 657         while (dev != NULL) {
 658                 if (cmp(&dev->device, data) == 0) {
 659                         DPAA_BUS_DEBUG("Found dev=(%s)\n", dev->device.name);
 660                         return &dev->device;
 661                 }
 662                 dev = TAILQ_NEXT(dev, next);
 663         }
 664
 665         DPAA_BUS_DEBUG("Unable to find any device\n");
 666         return NULL;
 667 }
 668
 669 /*
 670  * Get iommu class of DPAA2 devices on the bus.
 671  */
 672 static enum rte_iova_mode
 673 rte_dpaa_get_iommu_class(void)
 674 {
 675         if ((access(DPAA_DEV_PATH1, F_OK) != 0) &&
 676             (access(DPAA_DEV_PATH2, F_OK) != 0)) {
 677                 return RTE_IOVA_DC;
 678         }
 679         return RTE_IOVA_PA;
 680 }
 681
 682 static int
 683 dpaa_bus_plug(struct rte_device *dev __rte_unused)
 684 {
 685         /* No operation is performed while plugging the device */
 686         return 0;
 687 }
 688
 689 static int
 690 dpaa_bus_unplug(struct rte_device *dev __rte_unused)
 691 {
 692         /* No operation is performed while unplugging the device */
 693         return 0;
 694 }
 695
 696 static void *
 697 dpaa_bus_dev_iterate(const void *start, const char *str,
 698                      const struct rte_dev_iterator *it __rte_unused)
 699 {
 700         const struct rte_dpaa_device *dstart;
 701         struct rte_dpaa_device *dev;
 702         char *dup, *dev_name = NULL;
 703
 704         if (str == NULL) {
 705                 DPAA_BUS_DEBUG("No device string");
 706                 return NULL;
 707         }
 708
 709         /* Expectation is that device would be name=device_name */
 710         if (strncmp(str, "name=", 5) != 0) {
 711                 DPAA_BUS_DEBUG("Invalid device string (%s)\n", str);
 712                 return NULL;
 713         }
 714
 715         /* Now that name=device_name format is available, split */
 716         dup = strdup(str);
 717         dev_name = dup + strlen("name=");
 718
 719         if (start != NULL) {
 720                 dstart = RTE_DEV_TO_DPAA_CONST(start);
 721                 dev = TAILQ_NEXT(dstart, next);
 722         } else {
 723                 dev = TAILQ_FIRST(&rte_dpaa_bus.device_list);
 724         }
 725
 726         while (dev != NULL) {
 727                 if (strcmp(dev->device.name, dev_name) == 0) {
 728                         free(dup);
 729                         return &dev->device;
 730                 }
 731                 dev = TAILQ_NEXT(dev, next);
 732         }
 733
 734         free(dup);
 735         return NULL;
 736 }
 737
 738 static struct rte_dpaa_bus rte_dpaa_bus = {
 739         .bus = {
 740                 .scan = rte_dpaa_bus_scan,
 741                 .probe = rte_dpaa_bus_probe,
 742                 .parse = rte_dpaa_bus_parse,
 743                 .find_device = rte_dpaa_find_device,
 744                 .get_iommu_class = rte_dpaa_get_iommu_class,
 745                 .plug = dpaa_bus_plug,
 746                 .unplug = dpaa_bus_unplug,
 747                 .dev_iterate = dpaa_bus_dev_iterate,
 748         },
 749         .device_list = TAILQ_HEAD_INITIALIZER(rte_dpaa_bus.device_list),
 750         .driver_list = TAILQ_HEAD_INITIALIZER(rte_dpaa_bus.driver_list),
 751         .device_count = 0,
 752 };
 753
 754 RTE_REGISTER_BUS(FSL_DPAA_BUS_NAME, rte_dpaa_bus.bus);
 755 RTE_LOG_REGISTER(dpaa_logtype_bus, bus.dpaa, NOTICE);