drivers/dma/idxd/init.c

   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 void idxd_wqs_free_lock(struct idxd_device *idxd)
 145 {
 146         int i;
 147
 148         for (i = 0; i < idxd->max_wqs; i++) {
 149                 struct idxd_wq *wq = &idxd->wqs[i];
 150
 151                 percpu_free_rwsem(&wq->submit_lock);
 152         }
 153 }
 154
 155 static int idxd_setup_internals(struct idxd_device *idxd)
 156 {
 157         struct device *dev = &idxd->pdev->dev;
 158         int i;
 159
 160         idxd->groups = devm_kcalloc(dev, idxd->max_groups,
 161                                     sizeof(struct idxd_group), GFP_KERNEL);
 162         if (!idxd->groups)
 163                 return -ENOMEM;
 164
 165         for (i = 0; i < idxd->max_groups; i++) {
 166                 idxd->groups[i].idxd = idxd;
 167                 idxd->groups[i].id = i;
 168                 idxd->groups[i].tc_a = -1;
 169                 idxd->groups[i].tc_b = -1;
 170         }
 171
 172         idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq),
 173                                  GFP_KERNEL);
 174         if (!idxd->wqs)
 175                 return -ENOMEM;
 176
 177         idxd->engines = devm_kcalloc(dev, idxd->max_engines,
 178                                      sizeof(struct idxd_engine), GFP_KERNEL);
 179         if (!idxd->engines)
 180                 return -ENOMEM;
 181
 182         for (i = 0; i < idxd->max_wqs; i++) {
 183                 struct idxd_wq *wq = &idxd->wqs[i];
 184                 int rc;
 185
 186                 wq->id = i;
 187                 wq->idxd = idxd;
 188                 mutex_init(&wq->wq_lock);
 189                 atomic_set(&wq->dq_count, 0);
 190                 init_waitqueue_head(&wq->submit_waitq);
 191                 wq->idxd_cdev.minor = -1;
 192                 rc = percpu_init_rwsem(&wq->submit_lock);
 193                 if (rc < 0) {
 194                         idxd_wqs_free_lock(idxd);
 195                         return rc;
 196                 }
 197         }
 198
 199         for (i = 0; i < idxd->max_engines; i++) {
 200                 idxd->engines[i].idxd = idxd;
 201                 idxd->engines[i].id = i;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static void idxd_read_table_offsets(struct idxd_device *idxd)
 208 {
 209         union offsets_reg offsets;
 210         struct device *dev = &idxd->pdev->dev;
 211
 212         offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET);
 213         offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET
 214                         + sizeof(u64));
 215         idxd->grpcfg_offset = offsets.grpcfg * 0x100;
 216         dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
 217         idxd->wqcfg_offset = offsets.wqcfg * 0x100;
 218         dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n",
 219                 idxd->wqcfg_offset);
 220         idxd->msix_perm_offset = offsets.msix_perm * 0x100;
 221         dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n",
 222                 idxd->msix_perm_offset);
 223         idxd->perfmon_offset = offsets.perfmon * 0x100;
 224         dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
 225 }
 226
 227 static void idxd_read_caps(struct idxd_device *idxd)
 228 {
 229         struct device *dev = &idxd->pdev->dev;
 230         int i;
 231
 232         /* reading generic capabilities */
 233         idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET);
 234         dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
 235         idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
 236         dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
 237         idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
 238         dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
 239         if (idxd->hw.gen_cap.config_en)
 240                 set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags);
 241
 242         /* reading group capabilities */
 243         idxd->hw.group_cap.bits =
 244                 ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET);
 245         dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits);
 246         idxd->max_groups = idxd->hw.group_cap.num_groups;
 247         dev_dbg(dev, "max groups: %u\n", idxd->max_groups);
 248         idxd->max_tokens = idxd->hw.group_cap.total_tokens;
 249         dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens);
 250         idxd->nr_tokens = idxd->max_tokens;
 251
 252         /* read engine capabilities */
 253         idxd->hw.engine_cap.bits =
 254                 ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET);
 255         dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits);
 256         idxd->max_engines = idxd->hw.engine_cap.num_engines;
 257         dev_dbg(dev, "max engines: %u\n", idxd->max_engines);
 258
 259         /* read workqueue capabilities */
 260         idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET);
 261         dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits);
 262         idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size;
 263         dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size);
 264         idxd->max_wqs = idxd->hw.wq_cap.num_wqs;
 265         dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs);
 266
 267         /* reading operation capabilities */
 268         for (i = 0; i < 4; i++) {
 269                 idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base +
 270                                 IDXD_OPCAP_OFFSET + i * sizeof(u64));
 271                 dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
 272         }
 273 }
 274
 275 static struct idxd_device *idxd_alloc(struct pci_dev *pdev,
 276                                       void __iomem * const *iomap)
 277 {
 278         struct device *dev = &pdev->dev;
 279         struct idxd_device *idxd;
 280
 281         idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL);
 282         if (!idxd)
 283                 return NULL;
 284
 285         idxd->pdev = pdev;
 286         idxd->reg_base = iomap[IDXD_MMIO_BAR];
 287         spin_lock_init(&idxd->dev_lock);
 288
 289         return idxd;
 290 }
 291
 292 static int idxd_probe(struct idxd_device *idxd)
 293 {
 294         struct pci_dev *pdev = idxd->pdev;
 295         struct device *dev = &pdev->dev;
 296         int rc;
 297
 298         dev_dbg(dev, "%s entered and resetting device\n", __func__);
 299         rc = idxd_device_reset(idxd);
 300         if (rc < 0)
 301                 return rc;
 302         dev_dbg(dev, "IDXD reset complete\n");
 303
 304         idxd_read_caps(idxd);
 305         idxd_read_table_offsets(idxd);
 306
 307         rc = idxd_setup_internals(idxd);
 308         if (rc)
 309                 goto err_setup;
 310
 311         rc = idxd_setup_interrupts(idxd);
 312         if (rc)
 313                 goto err_setup;
 314
 315         dev_dbg(dev, "IDXD interrupt setup complete.\n");
 316
 317         mutex_lock(&idxd_idr_lock);
 318         idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL);
 319         mutex_unlock(&idxd_idr_lock);
 320         if (idxd->id < 0) {
 321                 rc = -ENOMEM;
 322                 goto err_idr_fail;
 323         }
 324
 325         idxd->major = idxd_cdev_get_major(idxd);
 326
 327         dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
 328         return 0;
 329
 330  err_idr_fail:
 331         idxd_mask_error_interrupts(idxd);
 332         idxd_mask_msix_vectors(idxd);
 333  err_setup:
 334         return rc;
 335 }
 336
 337 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 338 {
 339         void __iomem * const *iomap;
 340         struct device *dev = &pdev->dev;
 341         struct idxd_device *idxd;
 342         int rc;
 343         unsigned int mask;
 344
 345         rc = pcim_enable_device(pdev);
 346         if (rc)
 347                 return rc;
 348
 349         dev_dbg(dev, "Mapping BARs\n");
 350         mask = (1 << IDXD_MMIO_BAR);
 351         rc = pcim_iomap_regions(pdev, mask, DRV_NAME);
 352         if (rc)
 353                 return rc;
 354
 355         iomap = pcim_iomap_table(pdev);
 356         if (!iomap)
 357                 return -ENOMEM;
 358
 359         dev_dbg(dev, "Set DMA masks\n");
 360         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 361         if (rc)
 362                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 363         if (rc)
 364                 return rc;
 365
 366         rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 367         if (rc)
 368                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 369         if (rc)
 370                 return rc;
 371
 372         dev_dbg(dev, "Alloc IDXD context\n");
 373         idxd = idxd_alloc(pdev, iomap);
 374         if (!idxd)
 375                 return -ENOMEM;
 376
 377         idxd_set_type(idxd);
 378
 379         dev_dbg(dev, "Set PCI master\n");
 380         pci_set_master(pdev);
 381         pci_set_drvdata(pdev, idxd);
 382
 383         idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET);
 384         rc = idxd_probe(idxd);
 385         if (rc) {
 386                 dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n");
 387                 return -ENODEV;
 388         }
 389
 390         rc = idxd_setup_sysfs(idxd);
 391         if (rc) {
 392                 dev_err(dev, "IDXD sysfs setup failed\n");
 393                 return -ENODEV;
 394         }
 395
 396         idxd->state = IDXD_DEV_CONF_READY;
 397
 398         dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
 399                  idxd->hw.version);
 400
 401         return 0;
 402 }
 403
 404 static void idxd_flush_pending_llist(struct idxd_irq_entry *ie)
 405 {
 406         struct idxd_desc *desc, *itr;
 407         struct llist_node *head;
 408
 409         head = llist_del_all(&ie->pending_llist);
 410         if (!head)
 411                 return;
 412
 413         llist_for_each_entry_safe(desc, itr, head, llnode) {
 414                 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
 415                 idxd_free_desc(desc->wq, desc);
 416         }
 417 }
 418
 419 static void idxd_flush_work_list(struct idxd_irq_entry *ie)
 420 {
 421         struct idxd_desc *desc, *iter;
 422
 423         list_for_each_entry_safe(desc, iter, &ie->work_list, list) {
 424                 list_del(&desc->list);
 425                 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
 426                 idxd_free_desc(desc->wq, desc);
 427         }
 428 }
 429
 430 static void idxd_shutdown(struct pci_dev *pdev)
 431 {
 432         struct idxd_device *idxd = pci_get_drvdata(pdev);
 433         int rc, i;
 434         struct idxd_irq_entry *irq_entry;
 435         int msixcnt = pci_msix_vec_count(pdev);
 436         unsigned long flags;
 437
 438         spin_lock_irqsave(&idxd->dev_lock, flags);
 439         rc = idxd_device_disable(idxd);
 440         spin_unlock_irqrestore(&idxd->dev_lock, flags);
 441         if (rc)
 442                 dev_err(&pdev->dev, "Disabling device failed\n");
 443
 444         dev_dbg(&pdev->dev, "%s called\n", __func__);
 445         idxd_mask_msix_vectors(idxd);
 446         idxd_mask_error_interrupts(idxd);
 447
 448         for (i = 0; i < msixcnt; i++) {
 449                 irq_entry = &idxd->irq_entries[i];
 450                 synchronize_irq(idxd->msix_entries[i].vector);
 451                 if (i == 0)
 452                         continue;
 453                 idxd_flush_pending_llist(irq_entry);
 454                 idxd_flush_work_list(irq_entry);
 455         }
 456 }
 457
 458 static void idxd_remove(struct pci_dev *pdev)
 459 {
 460         struct idxd_device *idxd = pci_get_drvdata(pdev);
 461
 462         dev_dbg(&pdev->dev, "%s called\n", __func__);
 463         idxd_cleanup_sysfs(idxd);
 464         idxd_shutdown(pdev);
 465         idxd_wqs_free_lock(idxd);
 466         mutex_lock(&idxd_idr_lock);
 467         idr_remove(&idxd_idrs[idxd->type], idxd->id);
 468         mutex_unlock(&idxd_idr_lock);
 469 }
 470
 471 static struct pci_driver idxd_pci_driver = {
 472         .name           = DRV_NAME,
 473         .id_table       = idxd_pci_tbl,
 474         .probe          = idxd_pci_probe,
 475         .remove         = idxd_remove,
 476         .shutdown       = idxd_shutdown,
 477 };
 478
 479 static int __init idxd_init_module(void)
 480 {
 481         int err, i;
 482
 483         /*
 484          * If the CPU does not support write512, there's no point in
 485          * enumerating the device. We can not utilize it.
 486          */
 487         if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) {
 488                 pr_warn("idxd driver failed to load without MOVDIR64B.\n");
 489                 return -ENODEV;
 490         }
 491
 492         pr_info("%s: Intel(R) Accelerator Devices Driver %s\n",
 493                 DRV_NAME, IDXD_DRIVER_VERSION);
 494
 495         mutex_init(&idxd_idr_lock);
 496         for (i = 0; i < IDXD_TYPE_MAX; i++)
 497                 idr_init(&idxd_idrs[i]);
 498
 499         err = idxd_register_bus_type();
 500         if (err < 0)
 501                 return err;
 502
 503         err = idxd_register_driver();
 504         if (err < 0)
 505                 goto err_idxd_driver_register;
 506
 507         err = idxd_cdev_register();
 508         if (err)
 509                 goto err_cdev_register;
 510
 511         err = pci_register_driver(&idxd_pci_driver);
 512         if (err)
 513                 goto err_pci_register;
 514
 515         return 0;
 516
 517 err_pci_register:
 518         idxd_cdev_remove();
 519 err_cdev_register:
 520         idxd_unregister_driver();
 521 err_idxd_driver_register:
 522         idxd_unregister_bus_type();
 523         return err;
 524 }
 525 module_init(idxd_init_module);
 526
 527 static void __exit idxd_exit_module(void)
 528 {
 529         pci_unregister_driver(&idxd_pci_driver);
 530         idxd_cdev_remove();
 531         idxd_unregister_bus_type();
 532 }
 533 module_exit(idxd_exit_module);