ceph/src/seastar/dpdk/drivers/bus/pci/pci_common.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright 2013-2014 6WIND S.A.
   4  */
   5
   6 #include <string.h>
   7 #include <inttypes.h>
   8 #include <stdint.h>
   9 #include <stdbool.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <sys/queue.h>
  13 #include <sys/mman.h>
  14
  15 #include <rte_errno.h>
  16 #include <rte_interrupts.h>
  17 #include <rte_log.h>
  18 #include <rte_bus.h>
  19 #include <rte_pci.h>
  20 #include <rte_bus_pci.h>
  21 #include <rte_per_lcore.h>
  22 #include <rte_memory.h>
  23 #include <rte_eal.h>
  24 #include <rte_string_fns.h>
  25 #include <rte_common.h>
  26 #include <rte_devargs.h>
  27 #include <rte_vfio.h>
  28
  29 #include "private.h"
  30
  31
  32 #define SYSFS_PCI_DEVICES "/sys/bus/pci/devices"
  33
  34 const char *rte_pci_get_sysfs_path(void)
  35 {
  36         const char *path = NULL;
  37
  38         path = getenv("SYSFS_PCI_DEVICES");
  39         if (path == NULL)
  40                 return SYSFS_PCI_DEVICES;
  41
  42         return path;
  43 }
  44
  45 static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
  46 {
  47         struct rte_devargs *devargs;
  48         struct rte_pci_addr addr;
  49
  50         RTE_EAL_DEVARGS_FOREACH("pci", devargs) {
  51                 devargs->bus->parse(devargs->name, &addr);
  52                 if (!rte_pci_addr_cmp(&dev->addr, &addr))
  53                         return devargs;
  54         }
  55         return NULL;
  56 }
  57
  58 void
  59 pci_name_set(struct rte_pci_device *dev)
  60 {
  61         struct rte_devargs *devargs;
  62
  63         /* Each device has its internal, canonical name set. */
  64         rte_pci_device_name(&dev->addr,
  65                         dev->name, sizeof(dev->name));
  66         devargs = pci_devargs_lookup(dev);
  67         dev->device.devargs = devargs;
  68         /* In blacklist mode, if the device is not blacklisted, no
  69          * rte_devargs exists for it.
  70          */
  71         if (devargs != NULL)
  72                 /* If an rte_devargs exists, the generic rte_device uses the
  73                  * given name as its name.
  74                  */
  75                 dev->device.name = dev->device.devargs->name;
  76         else
  77                 /* Otherwise, it uses the internal, canonical form. */
  78                 dev->device.name = dev->name;
  79 }
  80
  81 /*
  82  * Match the PCI Driver and Device using the ID Table
  83  */
  84 int
  85 rte_pci_match(const struct rte_pci_driver *pci_drv,
  86               const struct rte_pci_device *pci_dev)
  87 {
  88         const struct rte_pci_id *id_table;
  89
  90         for (id_table = pci_drv->id_table; id_table->vendor_id != 0;
  91              id_table++) {
  92                 /* check if device's identifiers match the driver's ones */
  93                 if (id_table->vendor_id != pci_dev->id.vendor_id &&
  94                                 id_table->vendor_id != PCI_ANY_ID)
  95                         continue;
  96                 if (id_table->device_id != pci_dev->id.device_id &&
  97                                 id_table->device_id != PCI_ANY_ID)
  98                         continue;
  99                 if (id_table->subsystem_vendor_id !=
 100                     pci_dev->id.subsystem_vendor_id &&
 101                     id_table->subsystem_vendor_id != PCI_ANY_ID)
 102                         continue;
 103                 if (id_table->subsystem_device_id !=
 104                     pci_dev->id.subsystem_device_id &&
 105                     id_table->subsystem_device_id != PCI_ANY_ID)
 106                         continue;
 107                 if (id_table->class_id != pci_dev->id.class_id &&
 108                                 id_table->class_id != RTE_CLASS_ANY_ID)
 109                         continue;
 110
 111                 return 1;
 112         }
 113
 114         return 0;
 115 }
 116
 117 /*
 118  * If vendor/device ID match, call the probe() function of the
 119  * driver.
 120  */
 121 static int
 122 rte_pci_probe_one_driver(struct rte_pci_driver *dr,
 123                          struct rte_pci_device *dev)
 124 {
 125         int ret;
 126         bool already_probed;
 127         struct rte_pci_addr *loc;
 128
 129         if ((dr == NULL) || (dev == NULL))
 130                 return -EINVAL;
 131
 132         loc = &dev->addr;
 133
 134         /* The device is not blacklisted; Check if driver supports it */
 135         if (!rte_pci_match(dr, dev))
 136                 /* Match of device and driver failed */
 137                 return 1;
 138
 139         RTE_LOG(INFO, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
 140                         loc->domain, loc->bus, loc->devid, loc->function,
 141                         dev->device.numa_node);
 142
 143         /* no initialization when blacklisted, return without error */
 144         if (dev->device.devargs != NULL &&
 145                 dev->device.devargs->policy ==
 146                         RTE_DEV_BLACKLISTED) {
 147                 RTE_LOG(INFO, EAL, "  Device is blacklisted, not"
 148                         " initializing\n");
 149                 return 1;
 150         }
 151
 152         if (dev->device.numa_node < 0) {
 153                 RTE_LOG(WARNING, EAL, "  Invalid NUMA socket, default to 0\n");
 154                 dev->device.numa_node = 0;
 155         }
 156
 157         already_probed = rte_dev_is_probed(&dev->device);
 158         if (already_probed && !(dr->drv_flags & RTE_PCI_DRV_PROBE_AGAIN)) {
 159                 RTE_LOG(DEBUG, EAL, "Device %s is already probed\n",
 160                                 dev->device.name);
 161                 return -EEXIST;
 162         }
 163
 164         RTE_LOG(INFO, EAL, "  probe driver: %x:%x %s\n", dev->id.vendor_id,
 165                 dev->id.device_id, dr->driver.name);
 166
 167         /*
 168          * reference driver structure
 169          * This needs to be before rte_pci_map_device(), as it enables to use
 170          * driver flags for adjusting configuration.
 171          */
 172         if (!already_probed)
 173                 dev->driver = dr;
 174
 175         if (!already_probed && (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)) {
 176                 /* map resources for devices that use igb_uio */
 177                 ret = rte_pci_map_device(dev);
 178                 if (ret != 0) {
 179                         dev->driver = NULL;
 180                         return ret;
 181                 }
 182         }
 183
 184         /* call the driver probe() function */
 185         ret = dr->probe(dr, dev);
 186         if (already_probed)
 187                 return ret; /* no rollback if already succeeded earlier */
 188         if (ret) {
 189                 dev->driver = NULL;
 190                 if ((dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) &&
 191                         /* Don't unmap if device is unsupported and
 192                          * driver needs mapped resources.
 193                          */
 194                         !(ret > 0 &&
 195                                 (dr->drv_flags & RTE_PCI_DRV_KEEP_MAPPED_RES)))
 196                         rte_pci_unmap_device(dev);
 197         } else {
 198                 dev->device.driver = &dr->driver;
 199         }
 200
 201         return ret;
 202 }
 203
 204 /*
 205  * If vendor/device ID match, call the remove() function of the
 206  * driver.
 207  */
 208 static int
 209 rte_pci_detach_dev(struct rte_pci_device *dev)
 210 {
 211         struct rte_pci_addr *loc;
 212         struct rte_pci_driver *dr;
 213         int ret = 0;
 214
 215         if (dev == NULL)
 216                 return -EINVAL;
 217
 218         dr = dev->driver;
 219         loc = &dev->addr;
 220
 221         RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
 222                         loc->domain, loc->bus, loc->devid,
 223                         loc->function, dev->device.numa_node);
 224
 225         RTE_LOG(DEBUG, EAL, "  remove driver: %x:%x %s\n", dev->id.vendor_id,
 226                         dev->id.device_id, dr->driver.name);
 227
 228         if (dr->remove) {
 229                 ret = dr->remove(dev);
 230                 if (ret < 0)
 231                         return ret;
 232         }
 233
 234         /* clear driver structure */
 235         dev->driver = NULL;
 236
 237         if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)
 238                 /* unmap resources for devices that use igb_uio */
 239                 rte_pci_unmap_device(dev);
 240
 241         return 0;
 242 }
 243
 244 /*
 245  * If vendor/device ID match, call the probe() function of all
 246  * registered driver for the given device. Return < 0 if initialization
 247  * failed, return 1 if no driver is found for this device.
 248  */
 249 static int
 250 pci_probe_all_drivers(struct rte_pci_device *dev)
 251 {
 252         struct rte_pci_driver *dr = NULL;
 253         int rc = 0;
 254
 255         if (dev == NULL)
 256                 return -EINVAL;
 257
 258         FOREACH_DRIVER_ON_PCIBUS(dr) {
 259                 rc = rte_pci_probe_one_driver(dr, dev);
 260                 if (rc < 0)
 261                         /* negative value is an error */
 262                         return rc;
 263                 if (rc > 0)
 264                         /* positive value means driver doesn't support it */
 265                         continue;
 266                 return 0;
 267         }
 268         return 1;
 269 }
 270
 271 /*
 272  * Scan the content of the PCI bus, and call the probe() function for
 273  * all registered drivers that have a matching entry in its id_table
 274  * for discovered devices.
 275  */
 276 int
 277 rte_pci_probe(void)
 278 {
 279         struct rte_pci_device *dev = NULL;
 280         size_t probed = 0, failed = 0;
 281         struct rte_devargs *devargs;
 282         int probe_all = 0;
 283         int ret = 0;
 284
 285         if (rte_pci_bus.bus.conf.scan_mode != RTE_BUS_SCAN_WHITELIST)
 286                 probe_all = 1;
 287
 288         FOREACH_DEVICE_ON_PCIBUS(dev) {
 289                 probed++;
 290
 291                 devargs = dev->device.devargs;
 292                 /* probe all or only whitelisted devices */
 293                 if (probe_all)
 294                         ret = pci_probe_all_drivers(dev);
 295                 else if (devargs != NULL &&
 296                         devargs->policy == RTE_DEV_WHITELISTED)
 297                         ret = pci_probe_all_drivers(dev);
 298                 if (ret < 0) {
 299                         if (ret != -EEXIST) {
 300                                 RTE_LOG(ERR, EAL, "Requested device "
 301                                         PCI_PRI_FMT " cannot be used\n",
 302                                         dev->addr.domain, dev->addr.bus,
 303                                         dev->addr.devid, dev->addr.function);
 304                                 rte_errno = errno;
 305                                 failed++;
 306                         }
 307                         ret = 0;
 308                 }
 309         }
 310
 311         return (probed && probed == failed) ? -1 : 0;
 312 }
 313
 314 /* dump one device */
 315 static int
 316 pci_dump_one_device(FILE *f, struct rte_pci_device *dev)
 317 {
 318         int i;
 319
 320         fprintf(f, PCI_PRI_FMT, dev->addr.domain, dev->addr.bus,
 321                dev->addr.devid, dev->addr.function);
 322         fprintf(f, " - vendor:%x device:%x\n", dev->id.vendor_id,
 323                dev->id.device_id);
 324
 325         for (i = 0; i != sizeof(dev->mem_resource) /
 326                 sizeof(dev->mem_resource[0]); i++) {
 327                 fprintf(f, "   %16.16"PRIx64" %16.16"PRIx64"\n",
 328                         dev->mem_resource[i].phys_addr,
 329                         dev->mem_resource[i].len);
 330         }
 331         return 0;
 332 }
 333
 334 /* dump devices on the bus */
 335 void
 336 rte_pci_dump(FILE *f)
 337 {
 338         struct rte_pci_device *dev = NULL;
 339
 340         FOREACH_DEVICE_ON_PCIBUS(dev) {
 341                 pci_dump_one_device(f, dev);
 342         }
 343 }
 344
 345 static int
 346 pci_parse(const char *name, void *addr)
 347 {
 348         struct rte_pci_addr *out = addr;
 349         struct rte_pci_addr pci_addr;
 350         bool parse;
 351
 352         parse = (rte_pci_addr_parse(name, &pci_addr) == 0);
 353         if (parse && addr != NULL)
 354                 *out = pci_addr;
 355         return parse == false;
 356 }
 357
 358 /* register a driver */
 359 void
 360 rte_pci_register(struct rte_pci_driver *driver)
 361 {
 362         TAILQ_INSERT_TAIL(&rte_pci_bus.driver_list, driver, next);
 363         driver->bus = &rte_pci_bus;
 364 }
 365
 366 /* unregister a driver */
 367 void
 368 rte_pci_unregister(struct rte_pci_driver *driver)
 369 {
 370         TAILQ_REMOVE(&rte_pci_bus.driver_list, driver, next);
 371         driver->bus = NULL;
 372 }
 373
 374 /* Add a device to PCI bus */
 375 void
 376 rte_pci_add_device(struct rte_pci_device *pci_dev)
 377 {
 378         TAILQ_INSERT_TAIL(&rte_pci_bus.device_list, pci_dev, next);
 379 }
 380
 381 /* Insert a device into a predefined position in PCI bus */
 382 void
 383 rte_pci_insert_device(struct rte_pci_device *exist_pci_dev,
 384                       struct rte_pci_device *new_pci_dev)
 385 {
 386         TAILQ_INSERT_BEFORE(exist_pci_dev, new_pci_dev, next);
 387 }
 388
 389 /* Remove a device from PCI bus */
 390 static void
 391 rte_pci_remove_device(struct rte_pci_device *pci_dev)
 392 {
 393         TAILQ_REMOVE(&rte_pci_bus.device_list, pci_dev, next);
 394 }
 395
 396 static struct rte_device *
 397 pci_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
 398                 const void *data)
 399 {
 400         const struct rte_pci_device *pstart;
 401         struct rte_pci_device *pdev;
 402
 403         if (start != NULL) {
 404                 pstart = RTE_DEV_TO_PCI_CONST(start);
 405                 pdev = TAILQ_NEXT(pstart, next);
 406         } else {
 407                 pdev = TAILQ_FIRST(&rte_pci_bus.device_list);
 408         }
 409         while (pdev != NULL) {
 410                 if (cmp(&pdev->device, data) == 0)
 411                         return &pdev->device;
 412                 pdev = TAILQ_NEXT(pdev, next);
 413         }
 414         return NULL;
 415 }
 416
 417 /*
 418  * find the device which encounter the failure, by iterate over all device on
 419  * PCI bus to check if the memory failure address is located in the range
 420  * of the BARs of the device.
 421  */
 422 static struct rte_pci_device *
 423 pci_find_device_by_addr(const void *failure_addr)
 424 {
 425         struct rte_pci_device *pdev = NULL;
 426         uint64_t check_point, start, end, len;
 427         int i;
 428
 429         check_point = (uint64_t)(uintptr_t)failure_addr;
 430
 431         FOREACH_DEVICE_ON_PCIBUS(pdev) {
 432                 for (i = 0; i != RTE_DIM(pdev->mem_resource); i++) {
 433                         start = (uint64_t)(uintptr_t)pdev->mem_resource[i].addr;
 434                         len = pdev->mem_resource[i].len;
 435                         end = start + len;
 436                         if (check_point >= start && check_point < end) {
 437                                 RTE_LOG(DEBUG, EAL, "Failure address %16.16"
 438                                         PRIx64" belongs to device %s!\n",
 439                                         check_point, pdev->device.name);
 440                                 return pdev;
 441                         }
 442                 }
 443         }
 444         return NULL;
 445 }
 446
 447 static int
 448 pci_hot_unplug_handler(struct rte_device *dev)
 449 {
 450         struct rte_pci_device *pdev = NULL;
 451         int ret = 0;
 452
 453         pdev = RTE_DEV_TO_PCI(dev);
 454         if (!pdev)
 455                 return -1;
 456
 457         switch (pdev->kdrv) {
 458 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 459         case RTE_KDRV_VFIO:
 460                 /*
 461                  * vfio kernel module guaranty the pci device would not be
 462                  * deleted until the user space release the resource, so no
 463                  * need to remap BARs resource here, just directly notify
 464                  * the req event to the user space to handle it.
 465                  */
 466                 rte_dev_event_callback_process(dev->name,
 467                                                RTE_DEV_EVENT_REMOVE);
 468                 break;
 469 #endif
 470         case RTE_KDRV_IGB_UIO:
 471         case RTE_KDRV_UIO_GENERIC:
 472         case RTE_KDRV_NIC_UIO:
 473                 /* BARs resource is invalid, remap it to be safe. */
 474                 ret = pci_uio_remap_resource(pdev);
 475                 break;
 476         default:
 477                 RTE_LOG(DEBUG, EAL,
 478                         "Not managed by a supported kernel driver, skipped\n");
 479                 ret = -1;
 480                 break;
 481         }
 482
 483         return ret;
 484 }
 485
 486 static int
 487 pci_sigbus_handler(const void *failure_addr)
 488 {
 489         struct rte_pci_device *pdev = NULL;
 490         int ret = 0;
 491
 492         pdev = pci_find_device_by_addr(failure_addr);
 493         if (!pdev) {
 494                 /* It is a generic sigbus error, no bus would handle it. */
 495                 ret = 1;
 496         } else {
 497                 /* The sigbus error is caused of hot-unplug. */
 498                 ret = pci_hot_unplug_handler(&pdev->device);
 499                 if (ret) {
 500                         RTE_LOG(ERR, EAL,
 501                                 "Failed to handle hot-unplug for device %s",
 502                                 pdev->name);
 503                         ret = -1;
 504                 }
 505         }
 506         return ret;
 507 }
 508
 509 static int
 510 pci_plug(struct rte_device *dev)
 511 {
 512         return pci_probe_all_drivers(RTE_DEV_TO_PCI(dev));
 513 }
 514
 515 static int
 516 pci_unplug(struct rte_device *dev)
 517 {
 518         struct rte_pci_device *pdev;
 519         int ret;
 520
 521         pdev = RTE_DEV_TO_PCI(dev);
 522         ret = rte_pci_detach_dev(pdev);
 523         if (ret == 0) {
 524                 rte_pci_remove_device(pdev);
 525                 rte_devargs_remove(dev->devargs);
 526                 free(pdev);
 527         }
 528         return ret;
 529 }
 530
 531 static int
 532 pci_dma_map(struct rte_device *dev, void *addr, uint64_t iova, size_t len)
 533 {
 534         struct rte_pci_device *pdev = RTE_DEV_TO_PCI(dev);
 535
 536         if (!pdev || !pdev->driver) {
 537                 rte_errno = EINVAL;
 538                 return -1;
 539         }
 540         if (pdev->driver->dma_map)
 541                 return pdev->driver->dma_map(pdev, addr, iova, len);
 542         /**
 543          *  In case driver don't provides any specific mapping
 544          *  try fallback to VFIO.
 545          */
 546         if (pdev->kdrv == RTE_KDRV_VFIO)
 547                 return rte_vfio_container_dma_map
 548                                 (RTE_VFIO_DEFAULT_CONTAINER_FD, (uintptr_t)addr,
 549                                  iova, len);
 550         rte_errno = ENOTSUP;
 551         return -1;
 552 }
 553
 554 static int
 555 pci_dma_unmap(struct rte_device *dev, void *addr, uint64_t iova, size_t len)
 556 {
 557         struct rte_pci_device *pdev = RTE_DEV_TO_PCI(dev);
 558
 559         if (!pdev || !pdev->driver) {
 560                 rte_errno = EINVAL;
 561                 return -1;
 562         }
 563         if (pdev->driver->dma_unmap)
 564                 return pdev->driver->dma_unmap(pdev, addr, iova, len);
 565         /**
 566          *  In case driver don't provides any specific mapping
 567          *  try fallback to VFIO.
 568          */
 569         if (pdev->kdrv == RTE_KDRV_VFIO)
 570                 return rte_vfio_container_dma_unmap
 571                                 (RTE_VFIO_DEFAULT_CONTAINER_FD, (uintptr_t)addr,
 572                                  iova, len);
 573         rte_errno = ENOTSUP;
 574         return -1;
 575 }
 576
 577 struct rte_pci_bus rte_pci_bus = {
 578         .bus = {
 579                 .scan = rte_pci_scan,
 580                 .probe = rte_pci_probe,
 581                 .find_device = pci_find_device,
 582                 .plug = pci_plug,
 583                 .unplug = pci_unplug,
 584                 .parse = pci_parse,
 585                 .dma_map = pci_dma_map,
 586                 .dma_unmap = pci_dma_unmap,
 587                 .get_iommu_class = rte_pci_get_iommu_class,
 588                 .dev_iterate = rte_pci_dev_iterate,
 589                 .hot_unplug_handler = pci_hot_unplug_handler,
 590                 .sigbus_handler = pci_sigbus_handler,
 591         },
 592         .device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list),
 593         .driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list),
 594 };
 595
 596 RTE_REGISTER_BUS(pci, rte_pci_bus.bus);