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/pci.h> 7 #include <linux/io-64-nonatomic-lo-hi.h> 8 #include <linux/dmaengine.h> 9 #include <uapi/linux/idxd.h> 10 #include "../dmaengine.h" 11 #include "idxd.h" 12 #include "registers.h" 13 14 static int idxd_cmd_wait(struct idxd_device *idxd, u32 *status, int timeout); 15 static int idxd_cmd_send(struct idxd_device *idxd, int cmd_code, u32 operand); 16 17 /* Interrupt control bits */ 18 int idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id) 19 { 20 struct pci_dev *pdev = idxd->pdev; 21 int msixcnt = pci_msix_vec_count(pdev); 22 union msix_perm perm; 23 u32 offset; 24 25 if (vec_id < 0 || vec_id >= msixcnt) 26 return -EINVAL; 27 28 offset = idxd->msix_perm_offset + vec_id * 8; 29 perm.bits = ioread32(idxd->reg_base + offset); 30 perm.ignore = 1; 31 iowrite32(perm.bits, idxd->reg_base + offset); 32 33 return 0; 34 } 35 36 void idxd_mask_msix_vectors(struct idxd_device *idxd) 37 { 38 struct pci_dev *pdev = idxd->pdev; 39 int msixcnt = pci_msix_vec_count(pdev); 40 int i, rc; 41 42 for (i = 0; i < msixcnt; i++) { 43 rc = idxd_mask_msix_vector(idxd, i); 44 if (rc < 0) 45 dev_warn(&pdev->dev, 46 "Failed disabling msix vec %d\n", i); 47 } 48 } 49 50 int idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id) 51 { 52 struct pci_dev *pdev = idxd->pdev; 53 int msixcnt = pci_msix_vec_count(pdev); 54 union msix_perm perm; 55 u32 offset; 56 57 if (vec_id < 0 || vec_id >= msixcnt) 58 return -EINVAL; 59 60 offset = idxd->msix_perm_offset + vec_id * 8; 61 perm.bits = ioread32(idxd->reg_base + offset); 62 perm.ignore = 0; 63 iowrite32(perm.bits, idxd->reg_base + offset); 64 65 return 0; 66 } 67 68 void idxd_unmask_error_interrupts(struct idxd_device *idxd) 69 { 70 union genctrl_reg genctrl; 71 72 genctrl.bits = ioread32(idxd->reg_base + IDXD_GENCTRL_OFFSET); 73 genctrl.softerr_int_en = 1; 74 iowrite32(genctrl.bits, idxd->reg_base + IDXD_GENCTRL_OFFSET); 75 } 76 77 void idxd_mask_error_interrupts(struct idxd_device *idxd) 78 { 79 union genctrl_reg genctrl; 80 81 genctrl.bits = ioread32(idxd->reg_base + IDXD_GENCTRL_OFFSET); 82 genctrl.softerr_int_en = 0; 83 iowrite32(genctrl.bits, idxd->reg_base + IDXD_GENCTRL_OFFSET); 84 } 85 86 static void free_hw_descs(struct idxd_wq *wq) 87 { 88 int i; 89 90 for (i = 0; i < wq->num_descs; i++) 91 kfree(wq->hw_descs[i]); 92 93 kfree(wq->hw_descs); 94 } 95 96 static int alloc_hw_descs(struct idxd_wq *wq, int num) 97 { 98 struct device *dev = &wq->idxd->pdev->dev; 99 int i; 100 int node = dev_to_node(dev); 101 102 wq->hw_descs = kcalloc_node(num, sizeof(struct dsa_hw_desc *), 103 GFP_KERNEL, node); 104 if (!wq->hw_descs) 105 return -ENOMEM; 106 107 for (i = 0; i < num; i++) { 108 wq->hw_descs[i] = kzalloc_node(sizeof(*wq->hw_descs[i]), 109 GFP_KERNEL, node); 110 if (!wq->hw_descs[i]) { 111 free_hw_descs(wq); 112 return -ENOMEM; 113 } 114 } 115 116 return 0; 117 } 118 119 static void free_descs(struct idxd_wq *wq) 120 { 121 int i; 122 123 for (i = 0; i < wq->num_descs; i++) 124 kfree(wq->descs[i]); 125 126 kfree(wq->descs); 127 } 128 129 static int alloc_descs(struct idxd_wq *wq, int num) 130 { 131 struct device *dev = &wq->idxd->pdev->dev; 132 int i; 133 int node = dev_to_node(dev); 134 135 wq->descs = kcalloc_node(num, sizeof(struct idxd_desc *), 136 GFP_KERNEL, node); 137 if (!wq->descs) 138 return -ENOMEM; 139 140 for (i = 0; i < num; i++) { 141 wq->descs[i] = kzalloc_node(sizeof(*wq->descs[i]), 142 GFP_KERNEL, node); 143 if (!wq->descs[i]) { 144 free_descs(wq); 145 return -ENOMEM; 146 } 147 } 148 149 return 0; 150 } 151 152 /* WQ control bits */ 153 int idxd_wq_alloc_resources(struct idxd_wq *wq) 154 { 155 struct idxd_device *idxd = wq->idxd; 156 struct idxd_group *group = wq->group; 157 struct device *dev = &idxd->pdev->dev; 158 int rc, num_descs, i; 159 160 if (wq->type != IDXD_WQT_KERNEL) 161 return 0; 162 163 num_descs = wq->size + 164 idxd->hw.gen_cap.max_descs_per_engine * group->num_engines; 165 wq->num_descs = num_descs; 166 167 rc = alloc_hw_descs(wq, num_descs); 168 if (rc < 0) 169 return rc; 170 171 wq->compls_size = num_descs * sizeof(struct dsa_completion_record); 172 wq->compls = dma_alloc_coherent(dev, wq->compls_size, 173 &wq->compls_addr, GFP_KERNEL); 174 if (!wq->compls) { 175 rc = -ENOMEM; 176 goto fail_alloc_compls; 177 } 178 179 rc = alloc_descs(wq, num_descs); 180 if (rc < 0) 181 goto fail_alloc_descs; 182 183 rc = sbitmap_init_node(&wq->sbmap, num_descs, -1, GFP_KERNEL, 184 dev_to_node(dev)); 185 if (rc < 0) 186 goto fail_sbitmap_init; 187 188 for (i = 0; i < num_descs; i++) { 189 struct idxd_desc *desc = wq->descs[i]; 190 191 desc->hw = wq->hw_descs[i]; 192 desc->completion = &wq->compls[i]; 193 desc->compl_dma = wq->compls_addr + 194 sizeof(struct dsa_completion_record) * i; 195 desc->id = i; 196 desc->wq = wq; 197 198 dma_async_tx_descriptor_init(&desc->txd, &wq->dma_chan); 199 desc->txd.tx_submit = idxd_dma_tx_submit; 200 } 201 202 return 0; 203 204 fail_sbitmap_init: 205 free_descs(wq); 206 fail_alloc_descs: 207 dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr); 208 fail_alloc_compls: 209 free_hw_descs(wq); 210 return rc; 211 } 212 213 void idxd_wq_free_resources(struct idxd_wq *wq) 214 { 215 struct device *dev = &wq->idxd->pdev->dev; 216 217 if (wq->type != IDXD_WQT_KERNEL) 218 return; 219 220 free_hw_descs(wq); 221 free_descs(wq); 222 dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr); 223 sbitmap_free(&wq->sbmap); 224 } 225 226 int idxd_wq_enable(struct idxd_wq *wq) 227 { 228 struct idxd_device *idxd = wq->idxd; 229 struct device *dev = &idxd->pdev->dev; 230 u32 status; 231 int rc; 232 233 lockdep_assert_held(&idxd->dev_lock); 234 235 if (wq->state == IDXD_WQ_ENABLED) { 236 dev_dbg(dev, "WQ %d already enabled\n", wq->id); 237 return -ENXIO; 238 } 239 240 rc = idxd_cmd_send(idxd, IDXD_CMD_ENABLE_WQ, wq->id); 241 if (rc < 0) 242 return rc; 243 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 244 if (rc < 0) 245 return rc; 246 247 if (status != IDXD_CMDSTS_SUCCESS && 248 status != IDXD_CMDSTS_ERR_WQ_ENABLED) { 249 dev_dbg(dev, "WQ enable failed: %#x\n", status); 250 return -ENXIO; 251 } 252 253 wq->state = IDXD_WQ_ENABLED; 254 dev_dbg(dev, "WQ %d enabled\n", wq->id); 255 return 0; 256 } 257 258 int idxd_wq_disable(struct idxd_wq *wq) 259 { 260 struct idxd_device *idxd = wq->idxd; 261 struct device *dev = &idxd->pdev->dev; 262 u32 status, operand; 263 int rc; 264 265 lockdep_assert_held(&idxd->dev_lock); 266 dev_dbg(dev, "Disabling WQ %d\n", wq->id); 267 268 if (wq->state != IDXD_WQ_ENABLED) { 269 dev_dbg(dev, "WQ %d in wrong state: %d\n", wq->id, wq->state); 270 return 0; 271 } 272 273 operand = BIT(wq->id % 16) | ((wq->id / 16) << 16); 274 rc = idxd_cmd_send(idxd, IDXD_CMD_DISABLE_WQ, operand); 275 if (rc < 0) 276 return rc; 277 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 278 if (rc < 0) 279 return rc; 280 281 if (status != IDXD_CMDSTS_SUCCESS) { 282 dev_dbg(dev, "WQ disable failed: %#x\n", status); 283 return -ENXIO; 284 } 285 286 wq->state = IDXD_WQ_DISABLED; 287 dev_dbg(dev, "WQ %d disabled\n", wq->id); 288 return 0; 289 } 290 291 int idxd_wq_map_portal(struct idxd_wq *wq) 292 { 293 struct idxd_device *idxd = wq->idxd; 294 struct pci_dev *pdev = idxd->pdev; 295 struct device *dev = &pdev->dev; 296 resource_size_t start; 297 298 start = pci_resource_start(pdev, IDXD_WQ_BAR); 299 start = start + wq->id * IDXD_PORTAL_SIZE; 300 301 wq->dportal = devm_ioremap(dev, start, IDXD_PORTAL_SIZE); 302 if (!wq->dportal) 303 return -ENOMEM; 304 dev_dbg(dev, "wq %d portal mapped at %p\n", wq->id, wq->dportal); 305 306 return 0; 307 } 308 309 void idxd_wq_unmap_portal(struct idxd_wq *wq) 310 { 311 struct device *dev = &wq->idxd->pdev->dev; 312 313 devm_iounmap(dev, wq->dportal); 314 } 315 316 /* Device control bits */ 317 static inline bool idxd_is_enabled(struct idxd_device *idxd) 318 { 319 union gensts_reg gensts; 320 321 gensts.bits = ioread32(idxd->reg_base + IDXD_GENSTATS_OFFSET); 322 323 if (gensts.state == IDXD_DEVICE_STATE_ENABLED) 324 return true; 325 return false; 326 } 327 328 static int idxd_cmd_wait(struct idxd_device *idxd, u32 *status, int timeout) 329 { 330 u32 sts, to = timeout; 331 332 lockdep_assert_held(&idxd->dev_lock); 333 sts = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET); 334 while (sts & IDXD_CMDSTS_ACTIVE && --to) { 335 cpu_relax(); 336 sts = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET); 337 } 338 339 if (to == 0 && sts & IDXD_CMDSTS_ACTIVE) { 340 dev_warn(&idxd->pdev->dev, "%s timed out!\n", __func__); 341 *status = 0; 342 return -EBUSY; 343 } 344 345 *status = sts; 346 return 0; 347 } 348 349 static int idxd_cmd_send(struct idxd_device *idxd, int cmd_code, u32 operand) 350 { 351 union idxd_command_reg cmd; 352 int rc; 353 u32 status; 354 355 lockdep_assert_held(&idxd->dev_lock); 356 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 357 if (rc < 0) 358 return rc; 359 360 memset(&cmd, 0, sizeof(cmd)); 361 cmd.cmd = cmd_code; 362 cmd.operand = operand; 363 dev_dbg(&idxd->pdev->dev, "%s: sending cmd: %#x op: %#x\n", 364 __func__, cmd_code, operand); 365 iowrite32(cmd.bits, idxd->reg_base + IDXD_CMD_OFFSET); 366 367 return 0; 368 } 369 370 int idxd_device_enable(struct idxd_device *idxd) 371 { 372 struct device *dev = &idxd->pdev->dev; 373 int rc; 374 u32 status; 375 376 lockdep_assert_held(&idxd->dev_lock); 377 if (idxd_is_enabled(idxd)) { 378 dev_dbg(dev, "Device already enabled\n"); 379 return -ENXIO; 380 } 381 382 rc = idxd_cmd_send(idxd, IDXD_CMD_ENABLE_DEVICE, 0); 383 if (rc < 0) 384 return rc; 385 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 386 if (rc < 0) 387 return rc; 388 389 /* If the command is successful or if the device was enabled */ 390 if (status != IDXD_CMDSTS_SUCCESS && 391 status != IDXD_CMDSTS_ERR_DEV_ENABLED) { 392 dev_dbg(dev, "%s: err_code: %#x\n", __func__, status); 393 return -ENXIO; 394 } 395 396 idxd->state = IDXD_DEV_ENABLED; 397 return 0; 398 } 399 400 int idxd_device_disable(struct idxd_device *idxd) 401 { 402 struct device *dev = &idxd->pdev->dev; 403 int rc; 404 u32 status; 405 406 lockdep_assert_held(&idxd->dev_lock); 407 if (!idxd_is_enabled(idxd)) { 408 dev_dbg(dev, "Device is not enabled\n"); 409 return 0; 410 } 411 412 rc = idxd_cmd_send(idxd, IDXD_CMD_DISABLE_DEVICE, 0); 413 if (rc < 0) 414 return rc; 415 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 416 if (rc < 0) 417 return rc; 418 419 /* If the command is successful or if the device was disabled */ 420 if (status != IDXD_CMDSTS_SUCCESS && 421 !(status & IDXD_CMDSTS_ERR_DIS_DEV_EN)) { 422 dev_dbg(dev, "%s: err_code: %#x\n", __func__, status); 423 rc = -ENXIO; 424 return rc; 425 } 426 427 idxd->state = IDXD_DEV_CONF_READY; 428 return 0; 429 } 430 431 int __idxd_device_reset(struct idxd_device *idxd) 432 { 433 u32 status; 434 int rc; 435 436 rc = idxd_cmd_send(idxd, IDXD_CMD_RESET_DEVICE, 0); 437 if (rc < 0) 438 return rc; 439 rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT); 440 if (rc < 0) 441 return rc; 442 443 return 0; 444 } 445 446 int idxd_device_reset(struct idxd_device *idxd) 447 { 448 unsigned long flags; 449 int rc; 450 451 spin_lock_irqsave(&idxd->dev_lock, flags); 452 rc = __idxd_device_reset(idxd); 453 spin_unlock_irqrestore(&idxd->dev_lock, flags); 454 return rc; 455 } 456 457 /* Device configuration bits */ 458 static void idxd_group_config_write(struct idxd_group *group) 459 { 460 struct idxd_device *idxd = group->idxd; 461 struct device *dev = &idxd->pdev->dev; 462 int i; 463 u32 grpcfg_offset; 464 465 dev_dbg(dev, "Writing group %d cfg registers\n", group->id); 466 467 /* setup GRPWQCFG */ 468 for (i = 0; i < 4; i++) { 469 grpcfg_offset = idxd->grpcfg_offset + 470 group->id * 64 + i * sizeof(u64); 471 iowrite64(group->grpcfg.wqs[i], 472 idxd->reg_base + grpcfg_offset); 473 dev_dbg(dev, "GRPCFG wq[%d:%d: %#x]: %#llx\n", 474 group->id, i, grpcfg_offset, 475 ioread64(idxd->reg_base + grpcfg_offset)); 476 } 477 478 /* setup GRPENGCFG */ 479 grpcfg_offset = idxd->grpcfg_offset + group->id * 64 + 32; 480 iowrite64(group->grpcfg.engines, idxd->reg_base + grpcfg_offset); 481 dev_dbg(dev, "GRPCFG engs[%d: %#x]: %#llx\n", group->id, 482 grpcfg_offset, ioread64(idxd->reg_base + grpcfg_offset)); 483 484 /* setup GRPFLAGS */ 485 grpcfg_offset = idxd->grpcfg_offset + group->id * 64 + 40; 486 iowrite32(group->grpcfg.flags.bits, idxd->reg_base + grpcfg_offset); 487 dev_dbg(dev, "GRPFLAGS flags[%d: %#x]: %#x\n", 488 group->id, grpcfg_offset, 489 ioread32(idxd->reg_base + grpcfg_offset)); 490 } 491 492 static int idxd_groups_config_write(struct idxd_device *idxd) 493 494 { 495 union gencfg_reg reg; 496 int i; 497 struct device *dev = &idxd->pdev->dev; 498 499 /* Setup bandwidth token limit */ 500 if (idxd->token_limit) { 501 reg.bits = ioread32(idxd->reg_base + IDXD_GENCFG_OFFSET); 502 reg.token_limit = idxd->token_limit; 503 iowrite32(reg.bits, idxd->reg_base + IDXD_GENCFG_OFFSET); 504 } 505 506 dev_dbg(dev, "GENCFG(%#x): %#x\n", IDXD_GENCFG_OFFSET, 507 ioread32(idxd->reg_base + IDXD_GENCFG_OFFSET)); 508 509 for (i = 0; i < idxd->max_groups; i++) { 510 struct idxd_group *group = &idxd->groups[i]; 511 512 idxd_group_config_write(group); 513 } 514 515 return 0; 516 } 517 518 static int idxd_wq_config_write(struct idxd_wq *wq) 519 { 520 struct idxd_device *idxd = wq->idxd; 521 struct device *dev = &idxd->pdev->dev; 522 u32 wq_offset; 523 int i; 524 525 if (!wq->group) 526 return 0; 527 528 memset(&wq->wqcfg, 0, sizeof(union wqcfg)); 529 530 /* byte 0-3 */ 531 wq->wqcfg.wq_size = wq->size; 532 533 if (wq->size == 0) { 534 dev_warn(dev, "Incorrect work queue size: 0\n"); 535 return -EINVAL; 536 } 537 538 /* bytes 4-7 */ 539 wq->wqcfg.wq_thresh = wq->threshold; 540 541 /* byte 8-11 */ 542 wq->wqcfg.priv = !!(wq->type == IDXD_WQT_KERNEL); 543 wq->wqcfg.mode = 1; 544 545 wq->wqcfg.priority = wq->priority; 546 547 /* bytes 12-15 */ 548 wq->wqcfg.max_xfer_shift = idxd->hw.gen_cap.max_xfer_shift; 549 wq->wqcfg.max_batch_shift = idxd->hw.gen_cap.max_batch_shift; 550 551 dev_dbg(dev, "WQ %d CFGs\n", wq->id); 552 for (i = 0; i < 8; i++) { 553 wq_offset = idxd->wqcfg_offset + wq->id * 32 + i * sizeof(u32); 554 iowrite32(wq->wqcfg.bits[i], idxd->reg_base + wq_offset); 555 dev_dbg(dev, "WQ[%d][%d][%#x]: %#x\n", 556 wq->id, i, wq_offset, 557 ioread32(idxd->reg_base + wq_offset)); 558 } 559 560 return 0; 561 } 562 563 static int idxd_wqs_config_write(struct idxd_device *idxd) 564 { 565 int i, rc; 566 567 for (i = 0; i < idxd->max_wqs; i++) { 568 struct idxd_wq *wq = &idxd->wqs[i]; 569 570 rc = idxd_wq_config_write(wq); 571 if (rc < 0) 572 return rc; 573 } 574 575 return 0; 576 } 577 578 static void idxd_group_flags_setup(struct idxd_device *idxd) 579 { 580 int i; 581 582 /* TC-A 0 and TC-B 1 should be defaults */ 583 for (i = 0; i < idxd->max_groups; i++) { 584 struct idxd_group *group = &idxd->groups[i]; 585 586 if (group->tc_a == -1) 587 group->grpcfg.flags.tc_a = 0; 588 else 589 group->grpcfg.flags.tc_a = group->tc_a; 590 if (group->tc_b == -1) 591 group->grpcfg.flags.tc_b = 1; 592 else 593 group->grpcfg.flags.tc_b = group->tc_b; 594 group->grpcfg.flags.use_token_limit = group->use_token_limit; 595 group->grpcfg.flags.tokens_reserved = group->tokens_reserved; 596 if (group->tokens_allowed) 597 group->grpcfg.flags.tokens_allowed = 598 group->tokens_allowed; 599 else 600 group->grpcfg.flags.tokens_allowed = idxd->max_tokens; 601 } 602 } 603 604 static int idxd_engines_setup(struct idxd_device *idxd) 605 { 606 int i, engines = 0; 607 struct idxd_engine *eng; 608 struct idxd_group *group; 609 610 for (i = 0; i < idxd->max_groups; i++) { 611 group = &idxd->groups[i]; 612 group->grpcfg.engines = 0; 613 } 614 615 for (i = 0; i < idxd->max_engines; i++) { 616 eng = &idxd->engines[i]; 617 group = eng->group; 618 619 if (!group) 620 continue; 621 622 group->grpcfg.engines |= BIT(eng->id); 623 engines++; 624 } 625 626 if (!engines) 627 return -EINVAL; 628 629 return 0; 630 } 631 632 static int idxd_wqs_setup(struct idxd_device *idxd) 633 { 634 struct idxd_wq *wq; 635 struct idxd_group *group; 636 int i, j, configured = 0; 637 struct device *dev = &idxd->pdev->dev; 638 639 for (i = 0; i < idxd->max_groups; i++) { 640 group = &idxd->groups[i]; 641 for (j = 0; j < 4; j++) 642 group->grpcfg.wqs[j] = 0; 643 } 644 645 for (i = 0; i < idxd->max_wqs; i++) { 646 wq = &idxd->wqs[i]; 647 group = wq->group; 648 649 if (!wq->group) 650 continue; 651 if (!wq->size) 652 continue; 653 654 if (!wq_dedicated(wq)) { 655 dev_warn(dev, "No shared workqueue support.\n"); 656 return -EINVAL; 657 } 658 659 group->grpcfg.wqs[wq->id / 64] |= BIT(wq->id % 64); 660 configured++; 661 } 662 663 if (configured == 0) 664 return -EINVAL; 665 666 return 0; 667 } 668 669 int idxd_device_config(struct idxd_device *idxd) 670 { 671 int rc; 672 673 lockdep_assert_held(&idxd->dev_lock); 674 rc = idxd_wqs_setup(idxd); 675 if (rc < 0) 676 return rc; 677 678 rc = idxd_engines_setup(idxd); 679 if (rc < 0) 680 return rc; 681 682 idxd_group_flags_setup(idxd); 683 684 rc = idxd_wqs_config_write(idxd); 685 if (rc < 0) 686 return rc; 687 688 rc = idxd_groups_config_write(idxd); 689 if (rc < 0) 690 return rc; 691 692 return 0; 693 } 694