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