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/aer.h> 13 #include <linux/fs.h> 14 #include <linux/io-64-nonatomic-lo-hi.h> 15 #include <linux/device.h> 16 #include <linux/idr.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 23 MODULE_VERSION(IDXD_DRIVER_VERSION); 24 MODULE_LICENSE("GPL v2"); 25 MODULE_AUTHOR("Intel Corporation"); 26 27 #define DRV_NAME "idxd" 28 29 static struct idr idxd_idrs[IDXD_TYPE_MAX]; 30 static struct mutex idxd_idr_lock; 31 32 static struct pci_device_id idxd_pci_tbl[] = { 33 /* DSA ver 1.0 platforms */ 34 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) }, 35 { 0, } 36 }; 37 MODULE_DEVICE_TABLE(pci, idxd_pci_tbl); 38 39 static char *idxd_name[] = { 40 "dsa", 41 }; 42 43 const char *idxd_get_dev_name(struct idxd_device *idxd) 44 { 45 return idxd_name[idxd->type]; 46 } 47 48 static int idxd_setup_interrupts(struct idxd_device *idxd) 49 { 50 struct pci_dev *pdev = idxd->pdev; 51 struct device *dev = &pdev->dev; 52 struct msix_entry *msix; 53 struct idxd_irq_entry *irq_entry; 54 int i, msixcnt; 55 int rc = 0; 56 57 msixcnt = pci_msix_vec_count(pdev); 58 if (msixcnt < 0) { 59 dev_err(dev, "Not MSI-X interrupt capable.\n"); 60 goto err_no_irq; 61 } 62 63 idxd->msix_entries = devm_kzalloc(dev, sizeof(struct msix_entry) * 64 msixcnt, GFP_KERNEL); 65 if (!idxd->msix_entries) { 66 rc = -ENOMEM; 67 goto err_no_irq; 68 } 69 70 for (i = 0; i < msixcnt; i++) 71 idxd->msix_entries[i].entry = i; 72 73 rc = pci_enable_msix_exact(pdev, idxd->msix_entries, msixcnt); 74 if (rc) { 75 dev_err(dev, "Failed enabling %d MSIX entries.\n", msixcnt); 76 goto err_no_irq; 77 } 78 dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt); 79 80 /* 81 * We implement 1 completion list per MSI-X entry except for 82 * entry 0, which is for errors and others. 83 */ 84 idxd->irq_entries = devm_kcalloc(dev, msixcnt, 85 sizeof(struct idxd_irq_entry), 86 GFP_KERNEL); 87 if (!idxd->irq_entries) { 88 rc = -ENOMEM; 89 goto err_no_irq; 90 } 91 92 for (i = 0; i < msixcnt; i++) { 93 idxd->irq_entries[i].id = i; 94 idxd->irq_entries[i].idxd = idxd; 95 } 96 97 msix = &idxd->msix_entries[0]; 98 irq_entry = &idxd->irq_entries[0]; 99 rc = devm_request_threaded_irq(dev, msix->vector, idxd_irq_handler, 100 idxd_misc_thread, 0, "idxd-misc", 101 irq_entry); 102 if (rc < 0) { 103 dev_err(dev, "Failed to allocate misc interrupt.\n"); 104 goto err_no_irq; 105 } 106 107 dev_dbg(dev, "Allocated idxd-misc handler on msix vector %d\n", 108 msix->vector); 109 110 /* first MSI-X entry is not for wq interrupts */ 111 idxd->num_wq_irqs = msixcnt - 1; 112 113 for (i = 1; i < msixcnt; i++) { 114 msix = &idxd->msix_entries[i]; 115 irq_entry = &idxd->irq_entries[i]; 116 117 init_llist_head(&idxd->irq_entries[i].pending_llist); 118 INIT_LIST_HEAD(&idxd->irq_entries[i].work_list); 119 rc = devm_request_threaded_irq(dev, msix->vector, 120 idxd_irq_handler, 121 idxd_wq_thread, 0, 122 "idxd-portal", irq_entry); 123 if (rc < 0) { 124 dev_err(dev, "Failed to allocate irq %d.\n", 125 msix->vector); 126 goto err_no_irq; 127 } 128 dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n", 129 i, msix->vector); 130 } 131 132 idxd_unmask_error_interrupts(idxd); 133 134 return 0; 135 136 err_no_irq: 137 /* Disable error interrupt generation */ 138 idxd_mask_error_interrupts(idxd); 139 pci_disable_msix(pdev); 140 dev_err(dev, "No usable interrupts\n"); 141 return rc; 142 } 143 144 static int idxd_setup_internals(struct idxd_device *idxd) 145 { 146 struct device *dev = &idxd->pdev->dev; 147 int i; 148 149 init_waitqueue_head(&idxd->cmd_waitq); 150 idxd->groups = devm_kcalloc(dev, idxd->max_groups, 151 sizeof(struct idxd_group), GFP_KERNEL); 152 if (!idxd->groups) 153 return -ENOMEM; 154 155 for (i = 0; i < idxd->max_groups; i++) { 156 idxd->groups[i].idxd = idxd; 157 idxd->groups[i].id = i; 158 idxd->groups[i].tc_a = -1; 159 idxd->groups[i].tc_b = -1; 160 } 161 162 idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq), 163 GFP_KERNEL); 164 if (!idxd->wqs) 165 return -ENOMEM; 166 167 idxd->engines = devm_kcalloc(dev, idxd->max_engines, 168 sizeof(struct idxd_engine), GFP_KERNEL); 169 if (!idxd->engines) 170 return -ENOMEM; 171 172 for (i = 0; i < idxd->max_wqs; i++) { 173 struct idxd_wq *wq = &idxd->wqs[i]; 174 175 wq->id = i; 176 wq->idxd = idxd; 177 mutex_init(&wq->wq_lock); 178 wq->idxd_cdev.minor = -1; 179 } 180 181 for (i = 0; i < idxd->max_engines; i++) { 182 idxd->engines[i].idxd = idxd; 183 idxd->engines[i].id = i; 184 } 185 186 idxd->wq = create_workqueue(dev_name(dev)); 187 if (!idxd->wq) 188 return -ENOMEM; 189 190 return 0; 191 } 192 193 static void idxd_read_table_offsets(struct idxd_device *idxd) 194 { 195 union offsets_reg offsets; 196 struct device *dev = &idxd->pdev->dev; 197 198 offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET); 199 offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET 200 + sizeof(u64)); 201 idxd->grpcfg_offset = offsets.grpcfg * 0x100; 202 dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset); 203 idxd->wqcfg_offset = offsets.wqcfg * 0x100; 204 dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n", 205 idxd->wqcfg_offset); 206 idxd->msix_perm_offset = offsets.msix_perm * 0x100; 207 dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n", 208 idxd->msix_perm_offset); 209 idxd->perfmon_offset = offsets.perfmon * 0x100; 210 dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset); 211 } 212 213 static void idxd_read_caps(struct idxd_device *idxd) 214 { 215 struct device *dev = &idxd->pdev->dev; 216 int i; 217 218 /* reading generic capabilities */ 219 idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET); 220 dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits); 221 idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift; 222 dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes); 223 idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift; 224 dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size); 225 if (idxd->hw.gen_cap.config_en) 226 set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags); 227 228 /* reading group capabilities */ 229 idxd->hw.group_cap.bits = 230 ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET); 231 dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits); 232 idxd->max_groups = idxd->hw.group_cap.num_groups; 233 dev_dbg(dev, "max groups: %u\n", idxd->max_groups); 234 idxd->max_tokens = idxd->hw.group_cap.total_tokens; 235 dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens); 236 idxd->nr_tokens = idxd->max_tokens; 237 238 /* read engine capabilities */ 239 idxd->hw.engine_cap.bits = 240 ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET); 241 dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits); 242 idxd->max_engines = idxd->hw.engine_cap.num_engines; 243 dev_dbg(dev, "max engines: %u\n", idxd->max_engines); 244 245 /* read workqueue capabilities */ 246 idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET); 247 dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits); 248 idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size; 249 dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size); 250 idxd->max_wqs = idxd->hw.wq_cap.num_wqs; 251 dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs); 252 253 /* reading operation capabilities */ 254 for (i = 0; i < 4; i++) { 255 idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base + 256 IDXD_OPCAP_OFFSET + i * sizeof(u64)); 257 dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]); 258 } 259 } 260 261 static struct idxd_device *idxd_alloc(struct pci_dev *pdev, 262 void __iomem * const *iomap) 263 { 264 struct device *dev = &pdev->dev; 265 struct idxd_device *idxd; 266 267 idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL); 268 if (!idxd) 269 return NULL; 270 271 idxd->pdev = pdev; 272 idxd->reg_base = iomap[IDXD_MMIO_BAR]; 273 spin_lock_init(&idxd->dev_lock); 274 275 return idxd; 276 } 277 278 static int idxd_probe(struct idxd_device *idxd) 279 { 280 struct pci_dev *pdev = idxd->pdev; 281 struct device *dev = &pdev->dev; 282 int rc; 283 284 dev_dbg(dev, "%s entered and resetting device\n", __func__); 285 idxd_device_init_reset(idxd); 286 dev_dbg(dev, "IDXD reset complete\n"); 287 288 idxd_read_caps(idxd); 289 idxd_read_table_offsets(idxd); 290 291 rc = idxd_setup_internals(idxd); 292 if (rc) 293 goto err_setup; 294 295 rc = idxd_setup_interrupts(idxd); 296 if (rc) 297 goto err_setup; 298 299 dev_dbg(dev, "IDXD interrupt setup complete.\n"); 300 301 mutex_lock(&idxd_idr_lock); 302 idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL); 303 mutex_unlock(&idxd_idr_lock); 304 if (idxd->id < 0) { 305 rc = -ENOMEM; 306 goto err_idr_fail; 307 } 308 309 idxd->major = idxd_cdev_get_major(idxd); 310 311 dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id); 312 return 0; 313 314 err_idr_fail: 315 idxd_mask_error_interrupts(idxd); 316 idxd_mask_msix_vectors(idxd); 317 err_setup: 318 return rc; 319 } 320 321 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 322 { 323 void __iomem * const *iomap; 324 struct device *dev = &pdev->dev; 325 struct idxd_device *idxd; 326 int rc; 327 unsigned int mask; 328 329 rc = pcim_enable_device(pdev); 330 if (rc) 331 return rc; 332 333 dev_dbg(dev, "Mapping BARs\n"); 334 mask = (1 << IDXD_MMIO_BAR); 335 rc = pcim_iomap_regions(pdev, mask, DRV_NAME); 336 if (rc) 337 return rc; 338 339 iomap = pcim_iomap_table(pdev); 340 if (!iomap) 341 return -ENOMEM; 342 343 dev_dbg(dev, "Set DMA masks\n"); 344 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); 345 if (rc) 346 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); 347 if (rc) 348 return rc; 349 350 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); 351 if (rc) 352 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); 353 if (rc) 354 return rc; 355 356 dev_dbg(dev, "Alloc IDXD context\n"); 357 idxd = idxd_alloc(pdev, iomap); 358 if (!idxd) 359 return -ENOMEM; 360 361 idxd_set_type(idxd); 362 363 dev_dbg(dev, "Set PCI master\n"); 364 pci_set_master(pdev); 365 pci_set_drvdata(pdev, idxd); 366 367 idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET); 368 rc = idxd_probe(idxd); 369 if (rc) { 370 dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n"); 371 return -ENODEV; 372 } 373 374 rc = idxd_setup_sysfs(idxd); 375 if (rc) { 376 dev_err(dev, "IDXD sysfs setup failed\n"); 377 return -ENODEV; 378 } 379 380 idxd->state = IDXD_DEV_CONF_READY; 381 382 dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n", 383 idxd->hw.version); 384 385 return 0; 386 } 387 388 static void idxd_flush_pending_llist(struct idxd_irq_entry *ie) 389 { 390 struct idxd_desc *desc, *itr; 391 struct llist_node *head; 392 393 head = llist_del_all(&ie->pending_llist); 394 if (!head) 395 return; 396 397 llist_for_each_entry_safe(desc, itr, head, llnode) { 398 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT); 399 idxd_free_desc(desc->wq, desc); 400 } 401 } 402 403 static void idxd_flush_work_list(struct idxd_irq_entry *ie) 404 { 405 struct idxd_desc *desc, *iter; 406 407 list_for_each_entry_safe(desc, iter, &ie->work_list, list) { 408 list_del(&desc->list); 409 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT); 410 idxd_free_desc(desc->wq, desc); 411 } 412 } 413 414 static void idxd_shutdown(struct pci_dev *pdev) 415 { 416 struct idxd_device *idxd = pci_get_drvdata(pdev); 417 int rc, i; 418 struct idxd_irq_entry *irq_entry; 419 int msixcnt = pci_msix_vec_count(pdev); 420 421 rc = idxd_device_disable(idxd); 422 if (rc) 423 dev_err(&pdev->dev, "Disabling device failed\n"); 424 425 dev_dbg(&pdev->dev, "%s called\n", __func__); 426 idxd_mask_msix_vectors(idxd); 427 idxd_mask_error_interrupts(idxd); 428 429 for (i = 0; i < msixcnt; i++) { 430 irq_entry = &idxd->irq_entries[i]; 431 synchronize_irq(idxd->msix_entries[i].vector); 432 if (i == 0) 433 continue; 434 idxd_flush_pending_llist(irq_entry); 435 idxd_flush_work_list(irq_entry); 436 } 437 438 destroy_workqueue(idxd->wq); 439 } 440 441 static void idxd_remove(struct pci_dev *pdev) 442 { 443 struct idxd_device *idxd = pci_get_drvdata(pdev); 444 445 dev_dbg(&pdev->dev, "%s called\n", __func__); 446 idxd_cleanup_sysfs(idxd); 447 idxd_shutdown(pdev); 448 mutex_lock(&idxd_idr_lock); 449 idr_remove(&idxd_idrs[idxd->type], idxd->id); 450 mutex_unlock(&idxd_idr_lock); 451 } 452 453 static struct pci_driver idxd_pci_driver = { 454 .name = DRV_NAME, 455 .id_table = idxd_pci_tbl, 456 .probe = idxd_pci_probe, 457 .remove = idxd_remove, 458 .shutdown = idxd_shutdown, 459 }; 460 461 static int __init idxd_init_module(void) 462 { 463 int err, i; 464 465 /* 466 * If the CPU does not support write512, there's no point in 467 * enumerating the device. We can not utilize it. 468 */ 469 if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) { 470 pr_warn("idxd driver failed to load without MOVDIR64B.\n"); 471 return -ENODEV; 472 } 473 474 pr_info("%s: Intel(R) Accelerator Devices Driver %s\n", 475 DRV_NAME, IDXD_DRIVER_VERSION); 476 477 mutex_init(&idxd_idr_lock); 478 for (i = 0; i < IDXD_TYPE_MAX; i++) 479 idr_init(&idxd_idrs[i]); 480 481 err = idxd_register_bus_type(); 482 if (err < 0) 483 return err; 484 485 err = idxd_register_driver(); 486 if (err < 0) 487 goto err_idxd_driver_register; 488 489 err = idxd_cdev_register(); 490 if (err) 491 goto err_cdev_register; 492 493 err = pci_register_driver(&idxd_pci_driver); 494 if (err) 495 goto err_pci_register; 496 497 return 0; 498 499 err_pci_register: 500 idxd_cdev_remove(); 501 err_cdev_register: 502 idxd_unregister_driver(); 503 err_idxd_driver_register: 504 idxd_unregister_bus_type(); 505 return err; 506 } 507 module_init(idxd_init_module); 508 509 static void __exit idxd_exit_module(void) 510 { 511 pci_unregister_driver(&idxd_pci_driver); 512 idxd_cdev_remove(); 513 idxd_unregister_bus_type(); 514 } 515 module_exit(idxd_exit_module); 516