drivers/infiniband/hw/efa/efa_main.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
   2 /*
   3  * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/pci.h>
   8
   9 #include <rdma/ib_user_verbs.h>
  10
  11 #include "efa.h"
  12
  13 #define PCI_DEV_ID_EFA_VF 0xefa0
  14
  15 static const struct pci_device_id efa_pci_tbl[] = {
  16         { PCI_VDEVICE(AMAZON, PCI_DEV_ID_EFA_VF) },
  17         { }
  18 };
  19
  20 MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
  21 MODULE_LICENSE("Dual BSD/GPL");
  22 MODULE_DESCRIPTION(DEVICE_NAME);
  23 MODULE_DEVICE_TABLE(pci, efa_pci_tbl);
  24
  25 #define EFA_REG_BAR 0
  26 #define EFA_MEM_BAR 2
  27 #define EFA_BASE_BAR_MASK (BIT(EFA_REG_BAR) | BIT(EFA_MEM_BAR))
  28
  29 #define EFA_AENQ_ENABLED_GROUPS \
  30         (BIT(EFA_ADMIN_FATAL_ERROR) | BIT(EFA_ADMIN_WARNING) | \
  31          BIT(EFA_ADMIN_NOTIFICATION) | BIT(EFA_ADMIN_KEEP_ALIVE))
  32
  33 static void efa_update_network_attr(struct efa_dev *dev,
  34                                     struct efa_com_get_network_attr_result *network_attr)
  35 {
  36         memcpy(dev->addr, network_attr->addr, sizeof(network_attr->addr));
  37         dev->mtu = network_attr->mtu;
  38
  39         dev_dbg(&dev->pdev->dev, "Full address %pI6\n", dev->addr);
  40 }
  41
  42 /* This handler will called for unknown event group or unimplemented handlers */
  43 static void unimplemented_aenq_handler(void *data,
  44                                        struct efa_admin_aenq_entry *aenq_e)
  45 {
  46         struct efa_dev *dev = (struct efa_dev *)data;
  47
  48         ibdev_err(&dev->ibdev,
  49                   "Unknown event was received or event with unimplemented handler\n");
  50 }
  51
  52 static void efa_keep_alive(void *data, struct efa_admin_aenq_entry *aenq_e)
  53 {
  54         struct efa_dev *dev = (struct efa_dev *)data;
  55
  56         atomic64_inc(&dev->stats.keep_alive_rcvd);
  57 }
  58
  59 static struct efa_aenq_handlers aenq_handlers = {
  60         .handlers = {
  61                 [EFA_ADMIN_KEEP_ALIVE] = efa_keep_alive,
  62         },
  63         .unimplemented_handler = unimplemented_aenq_handler
  64 };
  65
  66 static void efa_release_bars(struct efa_dev *dev, int bars_mask)
  67 {
  68         struct pci_dev *pdev = dev->pdev;
  69         int release_bars;
  70
  71         release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & bars_mask;
  72         pci_release_selected_regions(pdev, release_bars);
  73 }
  74
  75 static irqreturn_t efa_intr_msix_mgmnt(int irq, void *data)
  76 {
  77         struct efa_dev *dev = data;
  78
  79         efa_com_admin_q_comp_intr_handler(&dev->edev);
  80         efa_com_aenq_intr_handler(&dev->edev, data);
  81
  82         return IRQ_HANDLED;
  83 }
  84
  85 static int efa_request_mgmnt_irq(struct efa_dev *dev)
  86 {
  87         struct efa_irq *irq;
  88         int err;
  89
  90         irq = &dev->admin_irq;
  91         err = request_irq(irq->vector, irq->handler, 0, irq->name,
  92                           irq->data);
  93         if (err) {
  94                 dev_err(&dev->pdev->dev, "Failed to request admin irq (%d)\n",
  95                         err);
  96                 return err;
  97         }
  98
  99         dev_dbg(&dev->pdev->dev, "Set affinity hint of mgmnt irq to %*pbl (irq vector: %d)\n",
 100                 nr_cpumask_bits, &irq->affinity_hint_mask, irq->vector);
 101         irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
 102
 103         return err;
 104 }
 105
 106 static void efa_setup_mgmnt_irq(struct efa_dev *dev)
 107 {
 108         u32 cpu;
 109
 110         snprintf(dev->admin_irq.name, EFA_IRQNAME_SIZE,
 111                  "efa-mgmnt@pci:%s", pci_name(dev->pdev));
 112         dev->admin_irq.handler = efa_intr_msix_mgmnt;
 113         dev->admin_irq.data = dev;
 114         dev->admin_irq.vector =
 115                 pci_irq_vector(dev->pdev, dev->admin_msix_vector_idx);
 116         cpu = cpumask_first(cpu_online_mask);
 117         dev->admin_irq.cpu = cpu;
 118         cpumask_set_cpu(cpu,
 119                         &dev->admin_irq.affinity_hint_mask);
 120         dev_info(&dev->pdev->dev, "Setup irq:0x%p vector:%d name:%s\n",
 121                  &dev->admin_irq,
 122                  dev->admin_irq.vector,
 123                  dev->admin_irq.name);
 124 }
 125
 126 static void efa_free_mgmnt_irq(struct efa_dev *dev)
 127 {
 128         struct efa_irq *irq;
 129
 130         irq = &dev->admin_irq;
 131         irq_set_affinity_hint(irq->vector, NULL);
 132         free_irq(irq->vector, irq->data);
 133 }
 134
 135 static int efa_set_mgmnt_irq(struct efa_dev *dev)
 136 {
 137         efa_setup_mgmnt_irq(dev);
 138
 139         return efa_request_mgmnt_irq(dev);
 140 }
 141
 142 static int efa_request_doorbell_bar(struct efa_dev *dev)
 143 {
 144         u8 db_bar_idx = dev->dev_attr.db_bar;
 145         struct pci_dev *pdev = dev->pdev;
 146         int bars;
 147         int err;
 148
 149         if (!(BIT(db_bar_idx) & EFA_BASE_BAR_MASK)) {
 150                 bars = pci_select_bars(pdev, IORESOURCE_MEM) & BIT(db_bar_idx);
 151
 152                 err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
 153                 if (err) {
 154                         dev_err(&dev->pdev->dev,
 155                                 "pci_request_selected_regions for bar %d failed %d\n",
 156                                 db_bar_idx, err);
 157                         return err;
 158                 }
 159         }
 160
 161         dev->db_bar_addr = pci_resource_start(dev->pdev, db_bar_idx);
 162         dev->db_bar_len = pci_resource_len(dev->pdev, db_bar_idx);
 163
 164         return 0;
 165 }
 166
 167 static void efa_release_doorbell_bar(struct efa_dev *dev)
 168 {
 169         if (!(BIT(dev->dev_attr.db_bar) & EFA_BASE_BAR_MASK))
 170                 efa_release_bars(dev, BIT(dev->dev_attr.db_bar));
 171 }
 172
 173 static void efa_update_hw_hints(struct efa_dev *dev,
 174                                 struct efa_com_get_hw_hints_result *hw_hints)
 175 {
 176         struct efa_com_dev *edev = &dev->edev;
 177
 178         if (hw_hints->mmio_read_timeout)
 179                 edev->mmio_read.mmio_read_timeout =
 180                         hw_hints->mmio_read_timeout * 1000;
 181
 182         if (hw_hints->poll_interval)
 183                 edev->aq.poll_interval = hw_hints->poll_interval;
 184
 185         if (hw_hints->admin_completion_timeout)
 186                 edev->aq.completion_timeout =
 187                         hw_hints->admin_completion_timeout;
 188 }
 189
 190 static void efa_stats_init(struct efa_dev *dev)
 191 {
 192         atomic64_t *s = (atomic64_t *)&dev->stats;
 193         int i;
 194
 195         for (i = 0; i < sizeof(dev->stats) / sizeof(*s); i++, s++)
 196                 atomic64_set(s, 0);
 197 }
 198
 199 static const struct ib_device_ops efa_dev_ops = {
 200         .alloc_pd = efa_alloc_pd,
 201         .alloc_ucontext = efa_alloc_ucontext,
 202         .create_ah = efa_create_ah,
 203         .create_cq = efa_create_cq,
 204         .create_qp = efa_create_qp,
 205         .dealloc_pd = efa_dealloc_pd,
 206         .dealloc_ucontext = efa_dealloc_ucontext,
 207         .dereg_mr = efa_dereg_mr,
 208         .destroy_ah = efa_destroy_ah,
 209         .destroy_cq = efa_destroy_cq,
 210         .destroy_qp = efa_destroy_qp,
 211         .get_link_layer = efa_port_link_layer,
 212         .get_port_immutable = efa_get_port_immutable,
 213         .mmap = efa_mmap,
 214         .modify_qp = efa_modify_qp,
 215         .query_device = efa_query_device,
 216         .query_gid = efa_query_gid,
 217         .query_pkey = efa_query_pkey,
 218         .query_port = efa_query_port,
 219         .query_qp = efa_query_qp,
 220         .reg_user_mr = efa_reg_mr,
 221
 222         INIT_RDMA_OBJ_SIZE(ib_ah, efa_ah, ibah),
 223         INIT_RDMA_OBJ_SIZE(ib_pd, efa_pd, ibpd),
 224         INIT_RDMA_OBJ_SIZE(ib_ucontext, efa_ucontext, ibucontext),
 225 };
 226
 227 static int efa_ib_device_add(struct efa_dev *dev)
 228 {
 229         struct efa_com_get_network_attr_result network_attr;
 230         struct efa_com_get_hw_hints_result hw_hints;
 231         struct pci_dev *pdev = dev->pdev;
 232         int err;
 233
 234         efa_stats_init(dev);
 235
 236         err = efa_com_get_device_attr(&dev->edev, &dev->dev_attr);
 237         if (err)
 238                 return err;
 239
 240         dev_dbg(&dev->pdev->dev, "Doorbells bar (%d)\n", dev->dev_attr.db_bar);
 241         err = efa_request_doorbell_bar(dev);
 242         if (err)
 243                 return err;
 244
 245         err = efa_com_get_network_attr(&dev->edev, &network_attr);
 246         if (err)
 247                 goto err_release_doorbell_bar;
 248
 249         efa_update_network_attr(dev, &network_attr);
 250
 251         err = efa_com_get_hw_hints(&dev->edev, &hw_hints);
 252         if (err)
 253                 goto err_release_doorbell_bar;
 254
 255         efa_update_hw_hints(dev, &hw_hints);
 256
 257         /* Try to enable all the available aenq groups */
 258         err = efa_com_set_aenq_config(&dev->edev, EFA_AENQ_ENABLED_GROUPS);
 259         if (err)
 260                 goto err_release_doorbell_bar;
 261
 262         dev->ibdev.owner = THIS_MODULE;
 263         dev->ibdev.node_type = RDMA_NODE_UNSPECIFIED;
 264         dev->ibdev.phys_port_cnt = 1;
 265         dev->ibdev.num_comp_vectors = 1;
 266         dev->ibdev.dev.parent = &pdev->dev;
 267         dev->ibdev.uverbs_abi_ver = EFA_UVERBS_ABI_VERSION;
 268
 269         dev->ibdev.uverbs_cmd_mask =
 270                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
 271                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
 272                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
 273                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
 274                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
 275                 (1ull << IB_USER_VERBS_CMD_REG_MR) |
 276                 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
 277                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 278                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
 279                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
 280                 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
 281                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
 282                 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
 283                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
 284                 (1ull << IB_USER_VERBS_CMD_CREATE_AH) |
 285                 (1ull << IB_USER_VERBS_CMD_DESTROY_AH);
 286
 287         dev->ibdev.uverbs_ex_cmd_mask =
 288                 (1ull << IB_USER_VERBS_EX_CMD_QUERY_DEVICE);
 289
 290         dev->ibdev.driver_id = RDMA_DRIVER_EFA;
 291         ib_set_device_ops(&dev->ibdev, &efa_dev_ops);
 292
 293         err = ib_register_device(&dev->ibdev, "efa_%d");
 294         if (err)
 295                 goto err_release_doorbell_bar;
 296
 297         ibdev_info(&dev->ibdev, "IB device registered\n");
 298
 299         return 0;
 300
 301 err_release_doorbell_bar:
 302         efa_release_doorbell_bar(dev);
 303         return err;
 304 }
 305
 306 static void efa_ib_device_remove(struct efa_dev *dev)
 307 {
 308         efa_com_dev_reset(&dev->edev, EFA_REGS_RESET_NORMAL);
 309         ibdev_info(&dev->ibdev, "Unregister ib device\n");
 310         ib_unregister_device(&dev->ibdev);
 311         efa_release_doorbell_bar(dev);
 312 }
 313
 314 static void efa_disable_msix(struct efa_dev *dev)
 315 {
 316         pci_free_irq_vectors(dev->pdev);
 317 }
 318
 319 static int efa_enable_msix(struct efa_dev *dev)
 320 {
 321         int msix_vecs, irq_num;
 322
 323         /* Reserve the max msix vectors we might need */
 324         msix_vecs = EFA_NUM_MSIX_VEC;
 325         dev_dbg(&dev->pdev->dev, "Trying to enable MSI-X, vectors %d\n",
 326                 msix_vecs);
 327
 328         dev->admin_msix_vector_idx = EFA_MGMNT_MSIX_VEC_IDX;
 329         irq_num = pci_alloc_irq_vectors(dev->pdev, msix_vecs,
 330                                         msix_vecs, PCI_IRQ_MSIX);
 331
 332         if (irq_num < 0) {
 333                 dev_err(&dev->pdev->dev, "Failed to enable MSI-X. irq_num %d\n",
 334                         irq_num);
 335                 return -ENOSPC;
 336         }
 337
 338         if (irq_num != msix_vecs) {
 339                 dev_err(&dev->pdev->dev,
 340                         "Allocated %d MSI-X (out of %d requested)\n",
 341                         irq_num, msix_vecs);
 342                 return -ENOSPC;
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int efa_device_init(struct efa_com_dev *edev, struct pci_dev *pdev)
 349 {
 350         int dma_width;
 351         int err;
 352
 353         err = efa_com_dev_reset(edev, EFA_REGS_RESET_NORMAL);
 354         if (err)
 355                 return err;
 356
 357         err = efa_com_validate_version(edev);
 358         if (err)
 359                 return err;
 360
 361         dma_width = efa_com_get_dma_width(edev);
 362         if (dma_width < 0) {
 363                 err = dma_width;
 364                 return err;
 365         }
 366
 367         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_width));
 368         if (err) {
 369                 dev_err(&pdev->dev, "pci_set_dma_mask failed %d\n", err);
 370                 return err;
 371         }
 372
 373         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_width));
 374         if (err) {
 375                 dev_err(&pdev->dev,
 376                         "err_pci_set_consistent_dma_mask failed %d\n",
 377                         err);
 378                 return err;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static struct efa_dev *efa_probe_device(struct pci_dev *pdev)
 385 {
 386         struct efa_com_dev *edev;
 387         struct efa_dev *dev;
 388         int bars;
 389         int err;
 390
 391         err = pci_enable_device_mem(pdev);
 392         if (err) {
 393                 dev_err(&pdev->dev, "pci_enable_device_mem() failed!\n");
 394                 return ERR_PTR(err);
 395         }
 396
 397         pci_set_master(pdev);
 398
 399         dev = ib_alloc_device(efa_dev, ibdev);
 400         if (!dev) {
 401                 dev_err(&pdev->dev, "Device alloc failed\n");
 402                 err = -ENOMEM;
 403                 goto err_disable_device;
 404         }
 405
 406         pci_set_drvdata(pdev, dev);
 407         edev = &dev->edev;
 408         edev->efa_dev = dev;
 409         edev->dmadev = &pdev->dev;
 410         dev->pdev = pdev;
 411
 412         bars = pci_select_bars(pdev, IORESOURCE_MEM) & EFA_BASE_BAR_MASK;
 413         err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
 414         if (err) {
 415                 dev_err(&pdev->dev, "pci_request_selected_regions failed %d\n",
 416                         err);
 417                 goto err_ibdev_destroy;
 418         }
 419
 420         dev->reg_bar_addr = pci_resource_start(pdev, EFA_REG_BAR);
 421         dev->reg_bar_len = pci_resource_len(pdev, EFA_REG_BAR);
 422         dev->mem_bar_addr = pci_resource_start(pdev, EFA_MEM_BAR);
 423         dev->mem_bar_len = pci_resource_len(pdev, EFA_MEM_BAR);
 424
 425         edev->reg_bar = devm_ioremap(&pdev->dev,
 426                                      dev->reg_bar_addr,
 427                                      dev->reg_bar_len);
 428         if (!edev->reg_bar) {
 429                 dev_err(&pdev->dev, "Failed to remap register bar\n");
 430                 err = -EFAULT;
 431                 goto err_release_bars;
 432         }
 433
 434         err = efa_com_mmio_reg_read_init(edev);
 435         if (err) {
 436                 dev_err(&pdev->dev, "Failed to init readless MMIO\n");
 437                 goto err_iounmap;
 438         }
 439
 440         err = efa_device_init(edev, pdev);
 441         if (err) {
 442                 dev_err(&pdev->dev, "EFA device init failed\n");
 443                 if (err == -ETIME)
 444                         err = -EPROBE_DEFER;
 445                 goto err_reg_read_destroy;
 446         }
 447
 448         err = efa_enable_msix(dev);
 449         if (err)
 450                 goto err_reg_read_destroy;
 451
 452         edev->aq.msix_vector_idx = dev->admin_msix_vector_idx;
 453         edev->aenq.msix_vector_idx = dev->admin_msix_vector_idx;
 454
 455         err = efa_set_mgmnt_irq(dev);
 456         if (err)
 457                 goto err_disable_msix;
 458
 459         err = efa_com_admin_init(edev, &aenq_handlers);
 460         if (err)
 461                 goto err_free_mgmnt_irq;
 462
 463         return dev;
 464
 465 err_free_mgmnt_irq:
 466         efa_free_mgmnt_irq(dev);
 467 err_disable_msix:
 468         efa_disable_msix(dev);
 469 err_reg_read_destroy:
 470         efa_com_mmio_reg_read_destroy(edev);
 471 err_iounmap:
 472         devm_iounmap(&pdev->dev, edev->reg_bar);
 473 err_release_bars:
 474         efa_release_bars(dev, EFA_BASE_BAR_MASK);
 475 err_ibdev_destroy:
 476         ib_dealloc_device(&dev->ibdev);
 477 err_disable_device:
 478         pci_disable_device(pdev);
 479         return ERR_PTR(err);
 480 }
 481
 482 static void efa_remove_device(struct pci_dev *pdev)
 483 {
 484         struct efa_dev *dev = pci_get_drvdata(pdev);
 485         struct efa_com_dev *edev;
 486
 487         edev = &dev->edev;
 488         efa_com_admin_destroy(edev);
 489         efa_free_mgmnt_irq(dev);
 490         efa_disable_msix(dev);
 491         efa_com_mmio_reg_read_destroy(edev);
 492         devm_iounmap(&pdev->dev, edev->reg_bar);
 493         efa_release_bars(dev, EFA_BASE_BAR_MASK);
 494         ib_dealloc_device(&dev->ibdev);
 495         pci_disable_device(pdev);
 496 }
 497
 498 static int efa_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 499 {
 500         struct efa_dev *dev;
 501         int err;
 502
 503         dev = efa_probe_device(pdev);
 504         if (IS_ERR(dev))
 505                 return PTR_ERR(dev);
 506
 507         err = efa_ib_device_add(dev);
 508         if (err)
 509                 goto err_remove_device;
 510
 511         return 0;
 512
 513 err_remove_device:
 514         efa_remove_device(pdev);
 515         return err;
 516 }
 517
 518 static void efa_remove(struct pci_dev *pdev)
 519 {
 520         struct efa_dev *dev = pci_get_drvdata(pdev);
 521
 522         efa_ib_device_remove(dev);
 523         efa_remove_device(pdev);
 524 }
 525
 526 static struct pci_driver efa_pci_driver = {
 527         .name           = DRV_MODULE_NAME,
 528         .id_table       = efa_pci_tbl,
 529         .probe          = efa_probe,
 530         .remove         = efa_remove,
 531 };
 532
 533 module_pci_driver(efa_pci_driver);