1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */ 3 #include <linux/init.h> 4 #include <linux/kernel.h> 5 #include <linux/module.h> 6 #include <linux/slab.h> 7 #include <linux/pci.h> 8 #include <linux/interrupt.h> 9 #include <linux/delay.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/workqueue.h> 12 #include <linux/fs.h> 13 #include <linux/io-64-nonatomic-lo-hi.h> 14 #include <linux/device.h> 15 #include <linux/idr.h> 16 #include <linux/iommu.h> 17 #include <uapi/linux/idxd.h> 18 #include <linux/dmaengine.h> 19 #include "../dmaengine.h" 20 #include "registers.h" 21 #include "idxd.h" 22 #include "perfmon.h" 23 24 MODULE_VERSION(IDXD_DRIVER_VERSION); 25 MODULE_LICENSE("GPL v2"); 26 MODULE_AUTHOR("Intel Corporation"); 27 MODULE_IMPORT_NS(IDXD); 28 29 static bool sva = true; 30 module_param(sva, bool, 0644); 31 MODULE_PARM_DESC(sva, "Toggle SVA support on/off"); 32 33 bool tc_override; 34 module_param(tc_override, bool, 0644); 35 MODULE_PARM_DESC(tc_override, "Override traffic class defaults"); 36 37 #define DRV_NAME "idxd" 38 39 bool support_enqcmd; 40 DEFINE_IDA(idxd_ida); 41 42 static struct idxd_driver_data idxd_driver_data[] = { 43 [IDXD_TYPE_DSA] = { 44 .name_prefix = "dsa", 45 .type = IDXD_TYPE_DSA, 46 .compl_size = sizeof(struct dsa_completion_record), 47 .align = 32, 48 .dev_type = &dsa_device_type, 49 .evl_cr_off = offsetof(struct dsa_evl_entry, cr), 50 .cr_status_off = offsetof(struct dsa_completion_record, status), 51 .cr_result_off = offsetof(struct dsa_completion_record, result), 52 }, 53 [IDXD_TYPE_IAX] = { 54 .name_prefix = "iax", 55 .type = IDXD_TYPE_IAX, 56 .compl_size = sizeof(struct iax_completion_record), 57 .align = 64, 58 .dev_type = &iax_device_type, 59 .evl_cr_off = offsetof(struct iax_evl_entry, cr), 60 .cr_status_off = offsetof(struct iax_completion_record, status), 61 .cr_result_off = offsetof(struct iax_completion_record, error_code), 62 }, 63 }; 64 65 static struct pci_device_id idxd_pci_tbl[] = { 66 /* DSA ver 1.0 platforms */ 67 { PCI_DEVICE_DATA(INTEL, DSA_SPR0, &idxd_driver_data[IDXD_TYPE_DSA]) }, 68 69 /* IAX ver 1.0 platforms */ 70 { PCI_DEVICE_DATA(INTEL, IAX_SPR0, &idxd_driver_data[IDXD_TYPE_IAX]) }, 71 { 0, } 72 }; 73 MODULE_DEVICE_TABLE(pci, idxd_pci_tbl); 74 75 static int idxd_setup_interrupts(struct idxd_device *idxd) 76 { 77 struct pci_dev *pdev = idxd->pdev; 78 struct device *dev = &pdev->dev; 79 struct idxd_irq_entry *ie; 80 int i, msixcnt; 81 int rc = 0; 82 83 msixcnt = pci_msix_vec_count(pdev); 84 if (msixcnt < 0) { 85 dev_err(dev, "Not MSI-X interrupt capable.\n"); 86 return -ENOSPC; 87 } 88 idxd->irq_cnt = msixcnt; 89 90 rc = pci_alloc_irq_vectors(pdev, msixcnt, msixcnt, PCI_IRQ_MSIX); 91 if (rc != msixcnt) { 92 dev_err(dev, "Failed enabling %d MSIX entries: %d\n", msixcnt, rc); 93 return -ENOSPC; 94 } 95 dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt); 96 97 98 ie = idxd_get_ie(idxd, 0); 99 ie->vector = pci_irq_vector(pdev, 0); 100 rc = request_threaded_irq(ie->vector, NULL, idxd_misc_thread, 0, "idxd-misc", ie); 101 if (rc < 0) { 102 dev_err(dev, "Failed to allocate misc interrupt.\n"); 103 goto err_misc_irq; 104 } 105 dev_dbg(dev, "Requested idxd-misc handler on msix vector %d\n", ie->vector); 106 107 for (i = 0; i < idxd->max_wqs; i++) { 108 int msix_idx = i + 1; 109 110 ie = idxd_get_ie(idxd, msix_idx); 111 ie->id = msix_idx; 112 ie->int_handle = INVALID_INT_HANDLE; 113 ie->pasid = IOMMU_PASID_INVALID; 114 115 spin_lock_init(&ie->list_lock); 116 init_llist_head(&ie->pending_llist); 117 INIT_LIST_HEAD(&ie->work_list); 118 } 119 120 idxd_unmask_error_interrupts(idxd); 121 return 0; 122 123 err_misc_irq: 124 idxd_mask_error_interrupts(idxd); 125 pci_free_irq_vectors(pdev); 126 dev_err(dev, "No usable interrupts\n"); 127 return rc; 128 } 129 130 static void idxd_cleanup_interrupts(struct idxd_device *idxd) 131 { 132 struct pci_dev *pdev = idxd->pdev; 133 struct idxd_irq_entry *ie; 134 int msixcnt; 135 136 msixcnt = pci_msix_vec_count(pdev); 137 if (msixcnt <= 0) 138 return; 139 140 ie = idxd_get_ie(idxd, 0); 141 idxd_mask_error_interrupts(idxd); 142 free_irq(ie->vector, ie); 143 pci_free_irq_vectors(pdev); 144 } 145 146 static int idxd_setup_wqs(struct idxd_device *idxd) 147 { 148 struct device *dev = &idxd->pdev->dev; 149 struct idxd_wq *wq; 150 struct device *conf_dev; 151 int i, rc; 152 153 idxd->wqs = kcalloc_node(idxd->max_wqs, sizeof(struct idxd_wq *), 154 GFP_KERNEL, dev_to_node(dev)); 155 if (!idxd->wqs) 156 return -ENOMEM; 157 158 idxd->wq_enable_map = bitmap_zalloc_node(idxd->max_wqs, GFP_KERNEL, dev_to_node(dev)); 159 if (!idxd->wq_enable_map) { 160 kfree(idxd->wqs); 161 return -ENOMEM; 162 } 163 164 for (i = 0; i < idxd->max_wqs; i++) { 165 wq = kzalloc_node(sizeof(*wq), GFP_KERNEL, dev_to_node(dev)); 166 if (!wq) { 167 rc = -ENOMEM; 168 goto err; 169 } 170 171 idxd_dev_set_type(&wq->idxd_dev, IDXD_DEV_WQ); 172 conf_dev = wq_confdev(wq); 173 wq->id = i; 174 wq->idxd = idxd; 175 device_initialize(wq_confdev(wq)); 176 conf_dev->parent = idxd_confdev(idxd); 177 conf_dev->bus = &dsa_bus_type; 178 conf_dev->type = &idxd_wq_device_type; 179 rc = dev_set_name(conf_dev, "wq%d.%d", idxd->id, wq->id); 180 if (rc < 0) { 181 put_device(conf_dev); 182 goto err; 183 } 184 185 mutex_init(&wq->wq_lock); 186 init_waitqueue_head(&wq->err_queue); 187 init_completion(&wq->wq_dead); 188 init_completion(&wq->wq_resurrect); 189 wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER; 190 idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH); 191 wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES; 192 wq->wqcfg = kzalloc_node(idxd->wqcfg_size, GFP_KERNEL, dev_to_node(dev)); 193 if (!wq->wqcfg) { 194 put_device(conf_dev); 195 rc = -ENOMEM; 196 goto err; 197 } 198 199 if (idxd->hw.wq_cap.op_config) { 200 wq->opcap_bmap = bitmap_zalloc(IDXD_MAX_OPCAP_BITS, GFP_KERNEL); 201 if (!wq->opcap_bmap) { 202 put_device(conf_dev); 203 rc = -ENOMEM; 204 goto err; 205 } 206 bitmap_copy(wq->opcap_bmap, idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS); 207 } 208 mutex_init(&wq->uc_lock); 209 xa_init(&wq->upasid_xa); 210 idxd->wqs[i] = wq; 211 } 212 213 return 0; 214 215 err: 216 while (--i >= 0) { 217 wq = idxd->wqs[i]; 218 conf_dev = wq_confdev(wq); 219 put_device(conf_dev); 220 } 221 return rc; 222 } 223 224 static int idxd_setup_engines(struct idxd_device *idxd) 225 { 226 struct idxd_engine *engine; 227 struct device *dev = &idxd->pdev->dev; 228 struct device *conf_dev; 229 int i, rc; 230 231 idxd->engines = kcalloc_node(idxd->max_engines, sizeof(struct idxd_engine *), 232 GFP_KERNEL, dev_to_node(dev)); 233 if (!idxd->engines) 234 return -ENOMEM; 235 236 for (i = 0; i < idxd->max_engines; i++) { 237 engine = kzalloc_node(sizeof(*engine), GFP_KERNEL, dev_to_node(dev)); 238 if (!engine) { 239 rc = -ENOMEM; 240 goto err; 241 } 242 243 idxd_dev_set_type(&engine->idxd_dev, IDXD_DEV_ENGINE); 244 conf_dev = engine_confdev(engine); 245 engine->id = i; 246 engine->idxd = idxd; 247 device_initialize(conf_dev); 248 conf_dev->parent = idxd_confdev(idxd); 249 conf_dev->bus = &dsa_bus_type; 250 conf_dev->type = &idxd_engine_device_type; 251 rc = dev_set_name(conf_dev, "engine%d.%d", idxd->id, engine->id); 252 if (rc < 0) { 253 put_device(conf_dev); 254 goto err; 255 } 256 257 idxd->engines[i] = engine; 258 } 259 260 return 0; 261 262 err: 263 while (--i >= 0) { 264 engine = idxd->engines[i]; 265 conf_dev = engine_confdev(engine); 266 put_device(conf_dev); 267 } 268 return rc; 269 } 270 271 static int idxd_setup_groups(struct idxd_device *idxd) 272 { 273 struct device *dev = &idxd->pdev->dev; 274 struct device *conf_dev; 275 struct idxd_group *group; 276 int i, rc; 277 278 idxd->groups = kcalloc_node(idxd->max_groups, sizeof(struct idxd_group *), 279 GFP_KERNEL, dev_to_node(dev)); 280 if (!idxd->groups) 281 return -ENOMEM; 282 283 for (i = 0; i < idxd->max_groups; i++) { 284 group = kzalloc_node(sizeof(*group), GFP_KERNEL, dev_to_node(dev)); 285 if (!group) { 286 rc = -ENOMEM; 287 goto err; 288 } 289 290 idxd_dev_set_type(&group->idxd_dev, IDXD_DEV_GROUP); 291 conf_dev = group_confdev(group); 292 group->id = i; 293 group->idxd = idxd; 294 device_initialize(conf_dev); 295 conf_dev->parent = idxd_confdev(idxd); 296 conf_dev->bus = &dsa_bus_type; 297 conf_dev->type = &idxd_group_device_type; 298 rc = dev_set_name(conf_dev, "group%d.%d", idxd->id, group->id); 299 if (rc < 0) { 300 put_device(conf_dev); 301 goto err; 302 } 303 304 idxd->groups[i] = group; 305 if (idxd->hw.version <= DEVICE_VERSION_2 && !tc_override) { 306 group->tc_a = 1; 307 group->tc_b = 1; 308 } else { 309 group->tc_a = -1; 310 group->tc_b = -1; 311 } 312 /* 313 * The default value is the same as the value of 314 * total read buffers in GRPCAP. 315 */ 316 group->rdbufs_allowed = idxd->max_rdbufs; 317 } 318 319 return 0; 320 321 err: 322 while (--i >= 0) { 323 group = idxd->groups[i]; 324 put_device(group_confdev(group)); 325 } 326 return rc; 327 } 328 329 static void idxd_cleanup_internals(struct idxd_device *idxd) 330 { 331 int i; 332 333 for (i = 0; i < idxd->max_groups; i++) 334 put_device(group_confdev(idxd->groups[i])); 335 for (i = 0; i < idxd->max_engines; i++) 336 put_device(engine_confdev(idxd->engines[i])); 337 for (i = 0; i < idxd->max_wqs; i++) 338 put_device(wq_confdev(idxd->wqs[i])); 339 destroy_workqueue(idxd->wq); 340 } 341 342 static int idxd_init_evl(struct idxd_device *idxd) 343 { 344 struct device *dev = &idxd->pdev->dev; 345 unsigned int evl_cache_size; 346 struct idxd_evl *evl; 347 const char *idxd_name; 348 349 if (idxd->hw.gen_cap.evl_support == 0) 350 return 0; 351 352 evl = kzalloc_node(sizeof(*evl), GFP_KERNEL, dev_to_node(dev)); 353 if (!evl) 354 return -ENOMEM; 355 356 spin_lock_init(&evl->lock); 357 evl->size = IDXD_EVL_SIZE_MIN; 358 359 idxd_name = dev_name(idxd_confdev(idxd)); 360 evl_cache_size = sizeof(struct idxd_evl_fault) + evl_ent_size(idxd); 361 /* 362 * Since completion record in evl_cache will be copied to user 363 * when handling completion record page fault, need to create 364 * the cache suitable for user copy. 365 */ 366 idxd->evl_cache = kmem_cache_create_usercopy(idxd_name, evl_cache_size, 367 0, 0, 0, evl_cache_size, 368 NULL); 369 if (!idxd->evl_cache) { 370 kfree(evl); 371 return -ENOMEM; 372 } 373 374 idxd->evl = evl; 375 return 0; 376 } 377 378 static int idxd_setup_internals(struct idxd_device *idxd) 379 { 380 struct device *dev = &idxd->pdev->dev; 381 int rc, i; 382 383 init_waitqueue_head(&idxd->cmd_waitq); 384 385 rc = idxd_setup_wqs(idxd); 386 if (rc < 0) 387 goto err_wqs; 388 389 rc = idxd_setup_engines(idxd); 390 if (rc < 0) 391 goto err_engine; 392 393 rc = idxd_setup_groups(idxd); 394 if (rc < 0) 395 goto err_group; 396 397 idxd->wq = create_workqueue(dev_name(dev)); 398 if (!idxd->wq) { 399 rc = -ENOMEM; 400 goto err_wkq_create; 401 } 402 403 rc = idxd_init_evl(idxd); 404 if (rc < 0) 405 goto err_evl; 406 407 return 0; 408 409 err_evl: 410 destroy_workqueue(idxd->wq); 411 err_wkq_create: 412 for (i = 0; i < idxd->max_groups; i++) 413 put_device(group_confdev(idxd->groups[i])); 414 err_group: 415 for (i = 0; i < idxd->max_engines; i++) 416 put_device(engine_confdev(idxd->engines[i])); 417 err_engine: 418 for (i = 0; i < idxd->max_wqs; i++) 419 put_device(wq_confdev(idxd->wqs[i])); 420 err_wqs: 421 return rc; 422 } 423 424 static void idxd_read_table_offsets(struct idxd_device *idxd) 425 { 426 union offsets_reg offsets; 427 struct device *dev = &idxd->pdev->dev; 428 429 offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET); 430 offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET + sizeof(u64)); 431 idxd->grpcfg_offset = offsets.grpcfg * IDXD_TABLE_MULT; 432 dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset); 433 idxd->wqcfg_offset = offsets.wqcfg * IDXD_TABLE_MULT; 434 dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n", idxd->wqcfg_offset); 435 idxd->msix_perm_offset = offsets.msix_perm * IDXD_TABLE_MULT; 436 dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n", idxd->msix_perm_offset); 437 idxd->perfmon_offset = offsets.perfmon * IDXD_TABLE_MULT; 438 dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset); 439 } 440 441 void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count) 442 { 443 int i, j, nr; 444 445 for (i = 0, nr = 0; i < count; i++) { 446 for (j = 0; j < BITS_PER_LONG_LONG; j++) { 447 if (val[i] & BIT(j)) 448 set_bit(nr, bmap); 449 nr++; 450 } 451 } 452 } 453 454 static void idxd_read_caps(struct idxd_device *idxd) 455 { 456 struct device *dev = &idxd->pdev->dev; 457 int i; 458 459 /* reading generic capabilities */ 460 idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET); 461 dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits); 462 463 if (idxd->hw.gen_cap.cmd_cap) { 464 idxd->hw.cmd_cap = ioread32(idxd->reg_base + IDXD_CMDCAP_OFFSET); 465 dev_dbg(dev, "cmd_cap: %#x\n", idxd->hw.cmd_cap); 466 } 467 468 /* reading command capabilities */ 469 if (idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE)) 470 idxd->request_int_handles = true; 471 472 idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift; 473 dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes); 474 idxd_set_max_batch_size(idxd->data->type, idxd, 1U << idxd->hw.gen_cap.max_batch_shift); 475 dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size); 476 if (idxd->hw.gen_cap.config_en) 477 set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags); 478 479 /* reading group capabilities */ 480 idxd->hw.group_cap.bits = 481 ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET); 482 dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits); 483 idxd->max_groups = idxd->hw.group_cap.num_groups; 484 dev_dbg(dev, "max groups: %u\n", idxd->max_groups); 485 idxd->max_rdbufs = idxd->hw.group_cap.total_rdbufs; 486 dev_dbg(dev, "max read buffers: %u\n", idxd->max_rdbufs); 487 idxd->nr_rdbufs = idxd->max_rdbufs; 488 489 /* read engine capabilities */ 490 idxd->hw.engine_cap.bits = 491 ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET); 492 dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits); 493 idxd->max_engines = idxd->hw.engine_cap.num_engines; 494 dev_dbg(dev, "max engines: %u\n", idxd->max_engines); 495 496 /* read workqueue capabilities */ 497 idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET); 498 dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits); 499 idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size; 500 dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size); 501 idxd->max_wqs = idxd->hw.wq_cap.num_wqs; 502 dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs); 503 idxd->wqcfg_size = 1 << (idxd->hw.wq_cap.wqcfg_size + IDXD_WQCFG_MIN); 504 dev_dbg(dev, "wqcfg size: %u\n", idxd->wqcfg_size); 505 506 /* reading operation capabilities */ 507 for (i = 0; i < 4; i++) { 508 idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base + 509 IDXD_OPCAP_OFFSET + i * sizeof(u64)); 510 dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]); 511 } 512 multi_u64_to_bmap(idxd->opcap_bmap, &idxd->hw.opcap.bits[0], 4); 513 514 /* read iaa cap */ 515 if (idxd->data->type == IDXD_TYPE_IAX && idxd->hw.version >= DEVICE_VERSION_2) 516 idxd->hw.iaa_cap.bits = ioread64(idxd->reg_base + IDXD_IAACAP_OFFSET); 517 } 518 519 static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data) 520 { 521 struct device *dev = &pdev->dev; 522 struct device *conf_dev; 523 struct idxd_device *idxd; 524 int rc; 525 526 idxd = kzalloc_node(sizeof(*idxd), GFP_KERNEL, dev_to_node(dev)); 527 if (!idxd) 528 return NULL; 529 530 conf_dev = idxd_confdev(idxd); 531 idxd->pdev = pdev; 532 idxd->data = data; 533 idxd_dev_set_type(&idxd->idxd_dev, idxd->data->type); 534 idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL); 535 if (idxd->id < 0) 536 return NULL; 537 538 idxd->opcap_bmap = bitmap_zalloc_node(IDXD_MAX_OPCAP_BITS, GFP_KERNEL, dev_to_node(dev)); 539 if (!idxd->opcap_bmap) { 540 ida_free(&idxd_ida, idxd->id); 541 return NULL; 542 } 543 544 device_initialize(conf_dev); 545 conf_dev->parent = dev; 546 conf_dev->bus = &dsa_bus_type; 547 conf_dev->type = idxd->data->dev_type; 548 rc = dev_set_name(conf_dev, "%s%d", idxd->data->name_prefix, idxd->id); 549 if (rc < 0) { 550 put_device(conf_dev); 551 return NULL; 552 } 553 554 spin_lock_init(&idxd->dev_lock); 555 spin_lock_init(&idxd->cmd_lock); 556 557 return idxd; 558 } 559 560 static int idxd_enable_system_pasid(struct idxd_device *idxd) 561 { 562 struct pci_dev *pdev = idxd->pdev; 563 struct device *dev = &pdev->dev; 564 struct iommu_domain *domain; 565 ioasid_t pasid; 566 int ret; 567 568 /* 569 * Attach a global PASID to the DMA domain so that we can use ENQCMDS 570 * to submit work on buffers mapped by DMA API. 571 */ 572 domain = iommu_get_domain_for_dev(dev); 573 if (!domain) 574 return -EPERM; 575 576 pasid = iommu_alloc_global_pasid(dev); 577 if (pasid == IOMMU_PASID_INVALID) 578 return -ENOSPC; 579 580 /* 581 * DMA domain is owned by the driver, it should support all valid 582 * types such as DMA-FQ, identity, etc. 583 */ 584 ret = iommu_attach_device_pasid(domain, dev, pasid); 585 if (ret) { 586 dev_err(dev, "failed to attach device pasid %d, domain type %d", 587 pasid, domain->type); 588 iommu_free_global_pasid(pasid); 589 return ret; 590 } 591 592 /* Since we set user privilege for kernel DMA, enable completion IRQ */ 593 idxd_set_user_intr(idxd, 1); 594 idxd->pasid = pasid; 595 596 return ret; 597 } 598 599 static void idxd_disable_system_pasid(struct idxd_device *idxd) 600 { 601 struct pci_dev *pdev = idxd->pdev; 602 struct device *dev = &pdev->dev; 603 struct iommu_domain *domain; 604 605 domain = iommu_get_domain_for_dev(dev); 606 if (!domain) 607 return; 608 609 iommu_detach_device_pasid(domain, dev, idxd->pasid); 610 iommu_free_global_pasid(idxd->pasid); 611 612 idxd_set_user_intr(idxd, 0); 613 idxd->sva = NULL; 614 idxd->pasid = IOMMU_PASID_INVALID; 615 } 616 617 static int idxd_enable_sva(struct pci_dev *pdev) 618 { 619 int ret; 620 621 ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF); 622 if (ret) 623 return ret; 624 625 ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA); 626 if (ret) 627 iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF); 628 629 return ret; 630 } 631 632 static void idxd_disable_sva(struct pci_dev *pdev) 633 { 634 iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA); 635 iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF); 636 } 637 638 static int idxd_probe(struct idxd_device *idxd) 639 { 640 struct pci_dev *pdev = idxd->pdev; 641 struct device *dev = &pdev->dev; 642 int rc; 643 644 dev_dbg(dev, "%s entered and resetting device\n", __func__); 645 rc = idxd_device_init_reset(idxd); 646 if (rc < 0) 647 return rc; 648 649 dev_dbg(dev, "IDXD reset complete\n"); 650 651 if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) { 652 if (idxd_enable_sva(pdev)) { 653 dev_warn(dev, "Unable to turn on user SVA feature.\n"); 654 } else { 655 set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags); 656 657 rc = idxd_enable_system_pasid(idxd); 658 if (rc) 659 dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc); 660 else 661 set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags); 662 } 663 } else if (!sva) { 664 dev_warn(dev, "User forced SVA off via module param.\n"); 665 } 666 667 idxd_read_caps(idxd); 668 idxd_read_table_offsets(idxd); 669 670 rc = idxd_setup_internals(idxd); 671 if (rc) 672 goto err; 673 674 /* If the configs are readonly, then load them from device */ 675 if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) { 676 dev_dbg(dev, "Loading RO device config\n"); 677 rc = idxd_device_load_config(idxd); 678 if (rc < 0) 679 goto err_config; 680 } 681 682 rc = idxd_setup_interrupts(idxd); 683 if (rc) 684 goto err_config; 685 686 idxd->major = idxd_cdev_get_major(idxd); 687 688 rc = perfmon_pmu_init(idxd); 689 if (rc < 0) 690 dev_warn(dev, "Failed to initialize perfmon. No PMU support: %d\n", rc); 691 692 dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id); 693 return 0; 694 695 err_config: 696 idxd_cleanup_internals(idxd); 697 err: 698 if (device_pasid_enabled(idxd)) 699 idxd_disable_system_pasid(idxd); 700 if (device_user_pasid_enabled(idxd)) 701 idxd_disable_sva(pdev); 702 return rc; 703 } 704 705 static void idxd_cleanup(struct idxd_device *idxd) 706 { 707 perfmon_pmu_remove(idxd); 708 idxd_cleanup_interrupts(idxd); 709 idxd_cleanup_internals(idxd); 710 if (device_pasid_enabled(idxd)) 711 idxd_disable_system_pasid(idxd); 712 if (device_user_pasid_enabled(idxd)) 713 idxd_disable_sva(idxd->pdev); 714 } 715 716 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 717 { 718 struct device *dev = &pdev->dev; 719 struct idxd_device *idxd; 720 struct idxd_driver_data *data = (struct idxd_driver_data *)id->driver_data; 721 int rc; 722 723 rc = pci_enable_device(pdev); 724 if (rc) 725 return rc; 726 727 dev_dbg(dev, "Alloc IDXD context\n"); 728 idxd = idxd_alloc(pdev, data); 729 if (!idxd) { 730 rc = -ENOMEM; 731 goto err_idxd_alloc; 732 } 733 734 dev_dbg(dev, "Mapping BARs\n"); 735 idxd->reg_base = pci_iomap(pdev, IDXD_MMIO_BAR, 0); 736 if (!idxd->reg_base) { 737 rc = -ENOMEM; 738 goto err_iomap; 739 } 740 741 dev_dbg(dev, "Set DMA masks\n"); 742 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 743 if (rc) 744 goto err; 745 746 dev_dbg(dev, "Set PCI master\n"); 747 pci_set_master(pdev); 748 pci_set_drvdata(pdev, idxd); 749 750 idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET); 751 rc = idxd_probe(idxd); 752 if (rc) { 753 dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n"); 754 goto err; 755 } 756 757 rc = idxd_register_devices(idxd); 758 if (rc) { 759 dev_err(dev, "IDXD sysfs setup failed\n"); 760 goto err_dev_register; 761 } 762 763 rc = idxd_device_init_debugfs(idxd); 764 if (rc) 765 dev_warn(dev, "IDXD debugfs failed to setup\n"); 766 767 dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n", 768 idxd->hw.version); 769 770 return 0; 771 772 err_dev_register: 773 idxd_cleanup(idxd); 774 err: 775 pci_iounmap(pdev, idxd->reg_base); 776 err_iomap: 777 put_device(idxd_confdev(idxd)); 778 err_idxd_alloc: 779 pci_disable_device(pdev); 780 return rc; 781 } 782 783 void idxd_wqs_quiesce(struct idxd_device *idxd) 784 { 785 struct idxd_wq *wq; 786 int i; 787 788 for (i = 0; i < idxd->max_wqs; i++) { 789 wq = idxd->wqs[i]; 790 if (wq->state == IDXD_WQ_ENABLED && wq->type == IDXD_WQT_KERNEL) 791 idxd_wq_quiesce(wq); 792 } 793 } 794 795 static void idxd_shutdown(struct pci_dev *pdev) 796 { 797 struct idxd_device *idxd = pci_get_drvdata(pdev); 798 struct idxd_irq_entry *irq_entry; 799 int rc; 800 801 rc = idxd_device_disable(idxd); 802 if (rc) 803 dev_err(&pdev->dev, "Disabling device failed\n"); 804 805 irq_entry = &idxd->ie; 806 synchronize_irq(irq_entry->vector); 807 idxd_mask_error_interrupts(idxd); 808 flush_workqueue(idxd->wq); 809 } 810 811 static void idxd_remove(struct pci_dev *pdev) 812 { 813 struct idxd_device *idxd = pci_get_drvdata(pdev); 814 struct idxd_irq_entry *irq_entry; 815 816 idxd_unregister_devices(idxd); 817 /* 818 * When ->release() is called for the idxd->conf_dev, it frees all the memory related 819 * to the idxd context. The driver still needs those bits in order to do the rest of 820 * the cleanup. However, we do need to unbound the idxd sub-driver. So take a ref 821 * on the device here to hold off the freeing while allowing the idxd sub-driver 822 * to unbind. 823 */ 824 get_device(idxd_confdev(idxd)); 825 device_unregister(idxd_confdev(idxd)); 826 idxd_shutdown(pdev); 827 if (device_pasid_enabled(idxd)) 828 idxd_disable_system_pasid(idxd); 829 idxd_device_remove_debugfs(idxd); 830 831 irq_entry = idxd_get_ie(idxd, 0); 832 free_irq(irq_entry->vector, irq_entry); 833 pci_free_irq_vectors(pdev); 834 pci_iounmap(pdev, idxd->reg_base); 835 if (device_user_pasid_enabled(idxd)) 836 idxd_disable_sva(pdev); 837 pci_disable_device(pdev); 838 destroy_workqueue(idxd->wq); 839 perfmon_pmu_remove(idxd); 840 put_device(idxd_confdev(idxd)); 841 } 842 843 static struct pci_driver idxd_pci_driver = { 844 .name = DRV_NAME, 845 .id_table = idxd_pci_tbl, 846 .probe = idxd_pci_probe, 847 .remove = idxd_remove, 848 .shutdown = idxd_shutdown, 849 }; 850 851 static int __init idxd_init_module(void) 852 { 853 int err; 854 855 /* 856 * If the CPU does not support MOVDIR64B or ENQCMDS, there's no point in 857 * enumerating the device. We can not utilize it. 858 */ 859 if (!cpu_feature_enabled(X86_FEATURE_MOVDIR64B)) { 860 pr_warn("idxd driver failed to load without MOVDIR64B.\n"); 861 return -ENODEV; 862 } 863 864 if (!cpu_feature_enabled(X86_FEATURE_ENQCMD)) 865 pr_warn("Platform does not have ENQCMD(S) support.\n"); 866 else 867 support_enqcmd = true; 868 869 perfmon_init(); 870 871 err = idxd_driver_register(&idxd_drv); 872 if (err < 0) 873 goto err_idxd_driver_register; 874 875 err = idxd_driver_register(&idxd_dmaengine_drv); 876 if (err < 0) 877 goto err_idxd_dmaengine_driver_register; 878 879 err = idxd_driver_register(&idxd_user_drv); 880 if (err < 0) 881 goto err_idxd_user_driver_register; 882 883 err = idxd_cdev_register(); 884 if (err) 885 goto err_cdev_register; 886 887 err = idxd_init_debugfs(); 888 if (err) 889 goto err_debugfs; 890 891 err = pci_register_driver(&idxd_pci_driver); 892 if (err) 893 goto err_pci_register; 894 895 return 0; 896 897 err_pci_register: 898 idxd_remove_debugfs(); 899 err_debugfs: 900 idxd_cdev_remove(); 901 err_cdev_register: 902 idxd_driver_unregister(&idxd_user_drv); 903 err_idxd_user_driver_register: 904 idxd_driver_unregister(&idxd_dmaengine_drv); 905 err_idxd_dmaengine_driver_register: 906 idxd_driver_unregister(&idxd_drv); 907 err_idxd_driver_register: 908 return err; 909 } 910 module_init(idxd_init_module); 911 912 static void __exit idxd_exit_module(void) 913 { 914 idxd_driver_unregister(&idxd_user_drv); 915 idxd_driver_unregister(&idxd_dmaengine_drv); 916 idxd_driver_unregister(&idxd_drv); 917 pci_unregister_driver(&idxd_pci_driver); 918 idxd_cdev_remove(); 919 perfmon_exit(); 920 idxd_remove_debugfs(); 921 } 922 module_exit(idxd_exit_module); 923