1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for FPGA Accelerated Function Unit (AFU) 4 * 5 * Copyright (C) 2017-2018 Intel Corporation, Inc. 6 * 7 * Authors: 8 * Wu Hao <hao.wu@intel.com> 9 * Xiao Guangrong <guangrong.xiao@linux.intel.com> 10 * Joseph Grecco <joe.grecco@intel.com> 11 * Enno Luebbers <enno.luebbers@intel.com> 12 * Tim Whisonant <tim.whisonant@intel.com> 13 * Ananda Ravuri <ananda.ravuri@intel.com> 14 * Henry Mitchel <henry.mitchel@intel.com> 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/uaccess.h> 20 #include <linux/fpga-dfl.h> 21 22 #include "dfl-afu.h" 23 24 /** 25 * __afu_port_enable - enable a port by clear reset 26 * @pdev: port platform device. 27 * 28 * Enable Port by clear the port soft reset bit, which is set by default. 29 * The AFU is unable to respond to any MMIO access while in reset. 30 * __afu_port_enable function should only be used after __afu_port_disable 31 * function. 32 * 33 * The caller needs to hold lock for protection. 34 */ 35 void __afu_port_enable(struct platform_device *pdev) 36 { 37 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 38 void __iomem *base; 39 u64 v; 40 41 WARN_ON(!pdata->disable_count); 42 43 if (--pdata->disable_count != 0) 44 return; 45 46 base = dfl_get_feature_ioaddr_by_id(&pdev->dev, PORT_FEATURE_ID_HEADER); 47 48 /* Clear port soft reset */ 49 v = readq(base + PORT_HDR_CTRL); 50 v &= ~PORT_CTRL_SFTRST; 51 writeq(v, base + PORT_HDR_CTRL); 52 } 53 54 #define RST_POLL_INVL 10 /* us */ 55 #define RST_POLL_TIMEOUT 1000 /* us */ 56 57 /** 58 * __afu_port_disable - disable a port by hold reset 59 * @pdev: port platform device. 60 * 61 * Disable Port by setting the port soft reset bit, it puts the port into reset. 62 * 63 * The caller needs to hold lock for protection. 64 */ 65 int __afu_port_disable(struct platform_device *pdev) 66 { 67 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 68 void __iomem *base; 69 u64 v; 70 71 if (pdata->disable_count++ != 0) 72 return 0; 73 74 base = dfl_get_feature_ioaddr_by_id(&pdev->dev, PORT_FEATURE_ID_HEADER); 75 76 /* Set port soft reset */ 77 v = readq(base + PORT_HDR_CTRL); 78 v |= PORT_CTRL_SFTRST; 79 writeq(v, base + PORT_HDR_CTRL); 80 81 /* 82 * HW sets ack bit to 1 when all outstanding requests have been drained 83 * on this port and minimum soft reset pulse width has elapsed. 84 * Driver polls port_soft_reset_ack to determine if reset done by HW. 85 */ 86 if (readq_poll_timeout(base + PORT_HDR_CTRL, v, v & PORT_CTRL_SFTRST, 87 RST_POLL_INVL, RST_POLL_TIMEOUT)) { 88 dev_err(&pdev->dev, "timeout, fail to reset device\n"); 89 return -ETIMEDOUT; 90 } 91 92 return 0; 93 } 94 95 /* 96 * This function resets the FPGA Port and its accelerator (AFU) by function 97 * __port_disable and __port_enable (set port soft reset bit and then clear 98 * it). Userspace can do Port reset at any time, e.g. during DMA or Partial 99 * Reconfiguration. But it should never cause any system level issue, only 100 * functional failure (e.g. DMA or PR operation failure) and be recoverable 101 * from the failure. 102 * 103 * Note: the accelerator (AFU) is not accessible when its port is in reset 104 * (disabled). Any attempts on MMIO access to AFU while in reset, will 105 * result errors reported via port error reporting sub feature (if present). 106 */ 107 static int __port_reset(struct platform_device *pdev) 108 { 109 int ret; 110 111 ret = __afu_port_disable(pdev); 112 if (!ret) 113 __afu_port_enable(pdev); 114 115 return ret; 116 } 117 118 static int port_reset(struct platform_device *pdev) 119 { 120 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 121 int ret; 122 123 mutex_lock(&pdata->lock); 124 ret = __port_reset(pdev); 125 mutex_unlock(&pdata->lock); 126 127 return ret; 128 } 129 130 static int port_get_id(struct platform_device *pdev) 131 { 132 void __iomem *base; 133 134 base = dfl_get_feature_ioaddr_by_id(&pdev->dev, PORT_FEATURE_ID_HEADER); 135 136 return FIELD_GET(PORT_CAP_PORT_NUM, readq(base + PORT_HDR_CAP)); 137 } 138 139 static ssize_t 140 id_show(struct device *dev, struct device_attribute *attr, char *buf) 141 { 142 int id = port_get_id(to_platform_device(dev)); 143 144 return scnprintf(buf, PAGE_SIZE, "%d\n", id); 145 } 146 static DEVICE_ATTR_RO(id); 147 148 static ssize_t 149 ltr_show(struct device *dev, struct device_attribute *attr, char *buf) 150 { 151 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 152 void __iomem *base; 153 u64 v; 154 155 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 156 157 mutex_lock(&pdata->lock); 158 v = readq(base + PORT_HDR_CTRL); 159 mutex_unlock(&pdata->lock); 160 161 return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_CTRL_LATENCY, v)); 162 } 163 164 static ssize_t 165 ltr_store(struct device *dev, struct device_attribute *attr, 166 const char *buf, size_t count) 167 { 168 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 169 void __iomem *base; 170 bool ltr; 171 u64 v; 172 173 if (kstrtobool(buf, <r)) 174 return -EINVAL; 175 176 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 177 178 mutex_lock(&pdata->lock); 179 v = readq(base + PORT_HDR_CTRL); 180 v &= ~PORT_CTRL_LATENCY; 181 v |= FIELD_PREP(PORT_CTRL_LATENCY, ltr ? 1 : 0); 182 writeq(v, base + PORT_HDR_CTRL); 183 mutex_unlock(&pdata->lock); 184 185 return count; 186 } 187 static DEVICE_ATTR_RW(ltr); 188 189 static ssize_t 190 ap1_event_show(struct device *dev, struct device_attribute *attr, char *buf) 191 { 192 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 193 void __iomem *base; 194 u64 v; 195 196 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 197 198 mutex_lock(&pdata->lock); 199 v = readq(base + PORT_HDR_STS); 200 mutex_unlock(&pdata->lock); 201 202 return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_STS_AP1_EVT, v)); 203 } 204 205 static ssize_t 206 ap1_event_store(struct device *dev, struct device_attribute *attr, 207 const char *buf, size_t count) 208 { 209 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 210 void __iomem *base; 211 bool clear; 212 213 if (kstrtobool(buf, &clear) || !clear) 214 return -EINVAL; 215 216 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 217 218 mutex_lock(&pdata->lock); 219 writeq(PORT_STS_AP1_EVT, base + PORT_HDR_STS); 220 mutex_unlock(&pdata->lock); 221 222 return count; 223 } 224 static DEVICE_ATTR_RW(ap1_event); 225 226 static ssize_t 227 ap2_event_show(struct device *dev, struct device_attribute *attr, 228 char *buf) 229 { 230 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 231 void __iomem *base; 232 u64 v; 233 234 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 235 236 mutex_lock(&pdata->lock); 237 v = readq(base + PORT_HDR_STS); 238 mutex_unlock(&pdata->lock); 239 240 return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_STS_AP2_EVT, v)); 241 } 242 243 static ssize_t 244 ap2_event_store(struct device *dev, struct device_attribute *attr, 245 const char *buf, size_t count) 246 { 247 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 248 void __iomem *base; 249 bool clear; 250 251 if (kstrtobool(buf, &clear) || !clear) 252 return -EINVAL; 253 254 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 255 256 mutex_lock(&pdata->lock); 257 writeq(PORT_STS_AP2_EVT, base + PORT_HDR_STS); 258 mutex_unlock(&pdata->lock); 259 260 return count; 261 } 262 static DEVICE_ATTR_RW(ap2_event); 263 264 static ssize_t 265 power_state_show(struct device *dev, struct device_attribute *attr, char *buf) 266 { 267 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 268 void __iomem *base; 269 u64 v; 270 271 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 272 273 mutex_lock(&pdata->lock); 274 v = readq(base + PORT_HDR_STS); 275 mutex_unlock(&pdata->lock); 276 277 return sprintf(buf, "0x%x\n", (u8)FIELD_GET(PORT_STS_PWR_STATE, v)); 278 } 279 static DEVICE_ATTR_RO(power_state); 280 281 static ssize_t 282 userclk_freqcmd_store(struct device *dev, struct device_attribute *attr, 283 const char *buf, size_t count) 284 { 285 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 286 u64 userclk_freq_cmd; 287 void __iomem *base; 288 289 if (kstrtou64(buf, 0, &userclk_freq_cmd)) 290 return -EINVAL; 291 292 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 293 294 mutex_lock(&pdata->lock); 295 writeq(userclk_freq_cmd, base + PORT_HDR_USRCLK_CMD0); 296 mutex_unlock(&pdata->lock); 297 298 return count; 299 } 300 static DEVICE_ATTR_WO(userclk_freqcmd); 301 302 static ssize_t 303 userclk_freqcntrcmd_store(struct device *dev, struct device_attribute *attr, 304 const char *buf, size_t count) 305 { 306 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 307 u64 userclk_freqcntr_cmd; 308 void __iomem *base; 309 310 if (kstrtou64(buf, 0, &userclk_freqcntr_cmd)) 311 return -EINVAL; 312 313 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 314 315 mutex_lock(&pdata->lock); 316 writeq(userclk_freqcntr_cmd, base + PORT_HDR_USRCLK_CMD1); 317 mutex_unlock(&pdata->lock); 318 319 return count; 320 } 321 static DEVICE_ATTR_WO(userclk_freqcntrcmd); 322 323 static ssize_t 324 userclk_freqsts_show(struct device *dev, struct device_attribute *attr, 325 char *buf) 326 { 327 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 328 u64 userclk_freqsts; 329 void __iomem *base; 330 331 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 332 333 mutex_lock(&pdata->lock); 334 userclk_freqsts = readq(base + PORT_HDR_USRCLK_STS0); 335 mutex_unlock(&pdata->lock); 336 337 return sprintf(buf, "0x%llx\n", (unsigned long long)userclk_freqsts); 338 } 339 static DEVICE_ATTR_RO(userclk_freqsts); 340 341 static ssize_t 342 userclk_freqcntrsts_show(struct device *dev, struct device_attribute *attr, 343 char *buf) 344 { 345 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 346 u64 userclk_freqcntrsts; 347 void __iomem *base; 348 349 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 350 351 mutex_lock(&pdata->lock); 352 userclk_freqcntrsts = readq(base + PORT_HDR_USRCLK_STS1); 353 mutex_unlock(&pdata->lock); 354 355 return sprintf(buf, "0x%llx\n", 356 (unsigned long long)userclk_freqcntrsts); 357 } 358 static DEVICE_ATTR_RO(userclk_freqcntrsts); 359 360 static struct attribute *port_hdr_attrs[] = { 361 &dev_attr_id.attr, 362 &dev_attr_ltr.attr, 363 &dev_attr_ap1_event.attr, 364 &dev_attr_ap2_event.attr, 365 &dev_attr_power_state.attr, 366 &dev_attr_userclk_freqcmd.attr, 367 &dev_attr_userclk_freqcntrcmd.attr, 368 &dev_attr_userclk_freqsts.attr, 369 &dev_attr_userclk_freqcntrsts.attr, 370 NULL, 371 }; 372 373 static umode_t port_hdr_attrs_visible(struct kobject *kobj, 374 struct attribute *attr, int n) 375 { 376 struct device *dev = kobj_to_dev(kobj); 377 umode_t mode = attr->mode; 378 void __iomem *base; 379 380 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); 381 382 if (dfl_feature_revision(base) > 0) { 383 /* 384 * userclk sysfs interfaces are only visible in case port 385 * revision is 0, as hardware with revision >0 doesn't 386 * support this. 387 */ 388 if (attr == &dev_attr_userclk_freqcmd.attr || 389 attr == &dev_attr_userclk_freqcntrcmd.attr || 390 attr == &dev_attr_userclk_freqsts.attr || 391 attr == &dev_attr_userclk_freqcntrsts.attr) 392 mode = 0; 393 } 394 395 return mode; 396 } 397 398 static const struct attribute_group port_hdr_group = { 399 .attrs = port_hdr_attrs, 400 .is_visible = port_hdr_attrs_visible, 401 }; 402 403 static int port_hdr_init(struct platform_device *pdev, 404 struct dfl_feature *feature) 405 { 406 port_reset(pdev); 407 408 return 0; 409 } 410 411 static long 412 port_hdr_ioctl(struct platform_device *pdev, struct dfl_feature *feature, 413 unsigned int cmd, unsigned long arg) 414 { 415 long ret; 416 417 switch (cmd) { 418 case DFL_FPGA_PORT_RESET: 419 if (!arg) 420 ret = port_reset(pdev); 421 else 422 ret = -EINVAL; 423 break; 424 default: 425 dev_dbg(&pdev->dev, "%x cmd not handled", cmd); 426 ret = -ENODEV; 427 } 428 429 return ret; 430 } 431 432 static const struct dfl_feature_id port_hdr_id_table[] = { 433 {.id = PORT_FEATURE_ID_HEADER,}, 434 {0,} 435 }; 436 437 static const struct dfl_feature_ops port_hdr_ops = { 438 .init = port_hdr_init, 439 .ioctl = port_hdr_ioctl, 440 }; 441 442 static ssize_t 443 afu_id_show(struct device *dev, struct device_attribute *attr, char *buf) 444 { 445 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); 446 void __iomem *base; 447 u64 guidl, guidh; 448 449 base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_AFU); 450 451 mutex_lock(&pdata->lock); 452 if (pdata->disable_count) { 453 mutex_unlock(&pdata->lock); 454 return -EBUSY; 455 } 456 457 guidl = readq(base + GUID_L); 458 guidh = readq(base + GUID_H); 459 mutex_unlock(&pdata->lock); 460 461 return scnprintf(buf, PAGE_SIZE, "%016llx%016llx\n", guidh, guidl); 462 } 463 static DEVICE_ATTR_RO(afu_id); 464 465 static struct attribute *port_afu_attrs[] = { 466 &dev_attr_afu_id.attr, 467 NULL 468 }; 469 470 static umode_t port_afu_attrs_visible(struct kobject *kobj, 471 struct attribute *attr, int n) 472 { 473 struct device *dev = kobj_to_dev(kobj); 474 475 /* 476 * sysfs entries are visible only if related private feature is 477 * enumerated. 478 */ 479 if (!dfl_get_feature_by_id(dev, PORT_FEATURE_ID_AFU)) 480 return 0; 481 482 return attr->mode; 483 } 484 485 static const struct attribute_group port_afu_group = { 486 .attrs = port_afu_attrs, 487 .is_visible = port_afu_attrs_visible, 488 }; 489 490 static int port_afu_init(struct platform_device *pdev, 491 struct dfl_feature *feature) 492 { 493 struct resource *res = &pdev->resource[feature->resource_index]; 494 495 return afu_mmio_region_add(dev_get_platdata(&pdev->dev), 496 DFL_PORT_REGION_INDEX_AFU, 497 resource_size(res), res->start, 498 DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ | 499 DFL_PORT_REGION_WRITE); 500 } 501 502 static const struct dfl_feature_id port_afu_id_table[] = { 503 {.id = PORT_FEATURE_ID_AFU,}, 504 {0,} 505 }; 506 507 static const struct dfl_feature_ops port_afu_ops = { 508 .init = port_afu_init, 509 }; 510 511 static int port_stp_init(struct platform_device *pdev, 512 struct dfl_feature *feature) 513 { 514 struct resource *res = &pdev->resource[feature->resource_index]; 515 516 return afu_mmio_region_add(dev_get_platdata(&pdev->dev), 517 DFL_PORT_REGION_INDEX_STP, 518 resource_size(res), res->start, 519 DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ | 520 DFL_PORT_REGION_WRITE); 521 } 522 523 static const struct dfl_feature_id port_stp_id_table[] = { 524 {.id = PORT_FEATURE_ID_STP,}, 525 {0,} 526 }; 527 528 static const struct dfl_feature_ops port_stp_ops = { 529 .init = port_stp_init, 530 }; 531 532 static struct dfl_feature_driver port_feature_drvs[] = { 533 { 534 .id_table = port_hdr_id_table, 535 .ops = &port_hdr_ops, 536 }, 537 { 538 .id_table = port_afu_id_table, 539 .ops = &port_afu_ops, 540 }, 541 { 542 .id_table = port_err_id_table, 543 .ops = &port_err_ops, 544 }, 545 { 546 .id_table = port_stp_id_table, 547 .ops = &port_stp_ops, 548 }, 549 { 550 .ops = NULL, 551 } 552 }; 553 554 static int afu_open(struct inode *inode, struct file *filp) 555 { 556 struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode); 557 struct dfl_feature_platform_data *pdata; 558 int ret; 559 560 pdata = dev_get_platdata(&fdev->dev); 561 if (WARN_ON(!pdata)) 562 return -ENODEV; 563 564 ret = dfl_feature_dev_use_begin(pdata); 565 if (ret) 566 return ret; 567 568 dev_dbg(&fdev->dev, "Device File Open\n"); 569 filp->private_data = fdev; 570 571 return 0; 572 } 573 574 static int afu_release(struct inode *inode, struct file *filp) 575 { 576 struct platform_device *pdev = filp->private_data; 577 struct dfl_feature_platform_data *pdata; 578 579 dev_dbg(&pdev->dev, "Device File Release\n"); 580 581 pdata = dev_get_platdata(&pdev->dev); 582 583 mutex_lock(&pdata->lock); 584 __port_reset(pdev); 585 afu_dma_region_destroy(pdata); 586 mutex_unlock(&pdata->lock); 587 588 dfl_feature_dev_use_end(pdata); 589 590 return 0; 591 } 592 593 static long afu_ioctl_check_extension(struct dfl_feature_platform_data *pdata, 594 unsigned long arg) 595 { 596 /* No extension support for now */ 597 return 0; 598 } 599 600 static long 601 afu_ioctl_get_info(struct dfl_feature_platform_data *pdata, void __user *arg) 602 { 603 struct dfl_fpga_port_info info; 604 struct dfl_afu *afu; 605 unsigned long minsz; 606 607 minsz = offsetofend(struct dfl_fpga_port_info, num_umsgs); 608 609 if (copy_from_user(&info, arg, minsz)) 610 return -EFAULT; 611 612 if (info.argsz < minsz) 613 return -EINVAL; 614 615 mutex_lock(&pdata->lock); 616 afu = dfl_fpga_pdata_get_private(pdata); 617 info.flags = 0; 618 info.num_regions = afu->num_regions; 619 info.num_umsgs = afu->num_umsgs; 620 mutex_unlock(&pdata->lock); 621 622 if (copy_to_user(arg, &info, sizeof(info))) 623 return -EFAULT; 624 625 return 0; 626 } 627 628 static long afu_ioctl_get_region_info(struct dfl_feature_platform_data *pdata, 629 void __user *arg) 630 { 631 struct dfl_fpga_port_region_info rinfo; 632 struct dfl_afu_mmio_region region; 633 unsigned long minsz; 634 long ret; 635 636 minsz = offsetofend(struct dfl_fpga_port_region_info, offset); 637 638 if (copy_from_user(&rinfo, arg, minsz)) 639 return -EFAULT; 640 641 if (rinfo.argsz < minsz || rinfo.padding) 642 return -EINVAL; 643 644 ret = afu_mmio_region_get_by_index(pdata, rinfo.index, ®ion); 645 if (ret) 646 return ret; 647 648 rinfo.flags = region.flags; 649 rinfo.size = region.size; 650 rinfo.offset = region.offset; 651 652 if (copy_to_user(arg, &rinfo, sizeof(rinfo))) 653 return -EFAULT; 654 655 return 0; 656 } 657 658 static long 659 afu_ioctl_dma_map(struct dfl_feature_platform_data *pdata, void __user *arg) 660 { 661 struct dfl_fpga_port_dma_map map; 662 unsigned long minsz; 663 long ret; 664 665 minsz = offsetofend(struct dfl_fpga_port_dma_map, iova); 666 667 if (copy_from_user(&map, arg, minsz)) 668 return -EFAULT; 669 670 if (map.argsz < minsz || map.flags) 671 return -EINVAL; 672 673 ret = afu_dma_map_region(pdata, map.user_addr, map.length, &map.iova); 674 if (ret) 675 return ret; 676 677 if (copy_to_user(arg, &map, sizeof(map))) { 678 afu_dma_unmap_region(pdata, map.iova); 679 return -EFAULT; 680 } 681 682 dev_dbg(&pdata->dev->dev, "dma map: ua=%llx, len=%llx, iova=%llx\n", 683 (unsigned long long)map.user_addr, 684 (unsigned long long)map.length, 685 (unsigned long long)map.iova); 686 687 return 0; 688 } 689 690 static long 691 afu_ioctl_dma_unmap(struct dfl_feature_platform_data *pdata, void __user *arg) 692 { 693 struct dfl_fpga_port_dma_unmap unmap; 694 unsigned long minsz; 695 696 minsz = offsetofend(struct dfl_fpga_port_dma_unmap, iova); 697 698 if (copy_from_user(&unmap, arg, minsz)) 699 return -EFAULT; 700 701 if (unmap.argsz < minsz || unmap.flags) 702 return -EINVAL; 703 704 return afu_dma_unmap_region(pdata, unmap.iova); 705 } 706 707 static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 708 { 709 struct platform_device *pdev = filp->private_data; 710 struct dfl_feature_platform_data *pdata; 711 struct dfl_feature *f; 712 long ret; 713 714 dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd); 715 716 pdata = dev_get_platdata(&pdev->dev); 717 718 switch (cmd) { 719 case DFL_FPGA_GET_API_VERSION: 720 return DFL_FPGA_API_VERSION; 721 case DFL_FPGA_CHECK_EXTENSION: 722 return afu_ioctl_check_extension(pdata, arg); 723 case DFL_FPGA_PORT_GET_INFO: 724 return afu_ioctl_get_info(pdata, (void __user *)arg); 725 case DFL_FPGA_PORT_GET_REGION_INFO: 726 return afu_ioctl_get_region_info(pdata, (void __user *)arg); 727 case DFL_FPGA_PORT_DMA_MAP: 728 return afu_ioctl_dma_map(pdata, (void __user *)arg); 729 case DFL_FPGA_PORT_DMA_UNMAP: 730 return afu_ioctl_dma_unmap(pdata, (void __user *)arg); 731 default: 732 /* 733 * Let sub-feature's ioctl function to handle the cmd 734 * Sub-feature's ioctl returns -ENODEV when cmd is not 735 * handled in this sub feature, and returns 0 and other 736 * error code if cmd is handled. 737 */ 738 dfl_fpga_dev_for_each_feature(pdata, f) 739 if (f->ops && f->ops->ioctl) { 740 ret = f->ops->ioctl(pdev, f, cmd, arg); 741 if (ret != -ENODEV) 742 return ret; 743 } 744 } 745 746 return -EINVAL; 747 } 748 749 static int afu_mmap(struct file *filp, struct vm_area_struct *vma) 750 { 751 struct platform_device *pdev = filp->private_data; 752 struct dfl_feature_platform_data *pdata; 753 u64 size = vma->vm_end - vma->vm_start; 754 struct dfl_afu_mmio_region region; 755 u64 offset; 756 int ret; 757 758 if (!(vma->vm_flags & VM_SHARED)) 759 return -EINVAL; 760 761 pdata = dev_get_platdata(&pdev->dev); 762 763 offset = vma->vm_pgoff << PAGE_SHIFT; 764 ret = afu_mmio_region_get_by_offset(pdata, offset, size, ®ion); 765 if (ret) 766 return ret; 767 768 if (!(region.flags & DFL_PORT_REGION_MMAP)) 769 return -EINVAL; 770 771 if ((vma->vm_flags & VM_READ) && !(region.flags & DFL_PORT_REGION_READ)) 772 return -EPERM; 773 774 if ((vma->vm_flags & VM_WRITE) && 775 !(region.flags & DFL_PORT_REGION_WRITE)) 776 return -EPERM; 777 778 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 779 780 return remap_pfn_range(vma, vma->vm_start, 781 (region.phys + (offset - region.offset)) >> PAGE_SHIFT, 782 size, vma->vm_page_prot); 783 } 784 785 static const struct file_operations afu_fops = { 786 .owner = THIS_MODULE, 787 .open = afu_open, 788 .release = afu_release, 789 .unlocked_ioctl = afu_ioctl, 790 .mmap = afu_mmap, 791 }; 792 793 static int afu_dev_init(struct platform_device *pdev) 794 { 795 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 796 struct dfl_afu *afu; 797 798 afu = devm_kzalloc(&pdev->dev, sizeof(*afu), GFP_KERNEL); 799 if (!afu) 800 return -ENOMEM; 801 802 afu->pdata = pdata; 803 804 mutex_lock(&pdata->lock); 805 dfl_fpga_pdata_set_private(pdata, afu); 806 afu_mmio_region_init(pdata); 807 afu_dma_region_init(pdata); 808 mutex_unlock(&pdata->lock); 809 810 return 0; 811 } 812 813 static int afu_dev_destroy(struct platform_device *pdev) 814 { 815 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 816 817 mutex_lock(&pdata->lock); 818 afu_mmio_region_destroy(pdata); 819 afu_dma_region_destroy(pdata); 820 dfl_fpga_pdata_set_private(pdata, NULL); 821 mutex_unlock(&pdata->lock); 822 823 return 0; 824 } 825 826 static int port_enable_set(struct platform_device *pdev, bool enable) 827 { 828 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); 829 int ret = 0; 830 831 mutex_lock(&pdata->lock); 832 if (enable) 833 __afu_port_enable(pdev); 834 else 835 ret = __afu_port_disable(pdev); 836 mutex_unlock(&pdata->lock); 837 838 return ret; 839 } 840 841 static struct dfl_fpga_port_ops afu_port_ops = { 842 .name = DFL_FPGA_FEATURE_DEV_PORT, 843 .owner = THIS_MODULE, 844 .get_id = port_get_id, 845 .enable_set = port_enable_set, 846 }; 847 848 static int afu_probe(struct platform_device *pdev) 849 { 850 int ret; 851 852 dev_dbg(&pdev->dev, "%s\n", __func__); 853 854 ret = afu_dev_init(pdev); 855 if (ret) 856 goto exit; 857 858 ret = dfl_fpga_dev_feature_init(pdev, port_feature_drvs); 859 if (ret) 860 goto dev_destroy; 861 862 ret = dfl_fpga_dev_ops_register(pdev, &afu_fops, THIS_MODULE); 863 if (ret) { 864 dfl_fpga_dev_feature_uinit(pdev); 865 goto dev_destroy; 866 } 867 868 return 0; 869 870 dev_destroy: 871 afu_dev_destroy(pdev); 872 exit: 873 return ret; 874 } 875 876 static int afu_remove(struct platform_device *pdev) 877 { 878 dev_dbg(&pdev->dev, "%s\n", __func__); 879 880 dfl_fpga_dev_ops_unregister(pdev); 881 dfl_fpga_dev_feature_uinit(pdev); 882 afu_dev_destroy(pdev); 883 884 return 0; 885 } 886 887 static const struct attribute_group *afu_dev_groups[] = { 888 &port_hdr_group, 889 &port_afu_group, 890 &port_err_group, 891 NULL 892 }; 893 894 static struct platform_driver afu_driver = { 895 .driver = { 896 .name = DFL_FPGA_FEATURE_DEV_PORT, 897 .dev_groups = afu_dev_groups, 898 }, 899 .probe = afu_probe, 900 .remove = afu_remove, 901 }; 902 903 static int __init afu_init(void) 904 { 905 int ret; 906 907 dfl_fpga_port_ops_add(&afu_port_ops); 908 909 ret = platform_driver_register(&afu_driver); 910 if (ret) 911 dfl_fpga_port_ops_del(&afu_port_ops); 912 913 return ret; 914 } 915 916 static void __exit afu_exit(void) 917 { 918 platform_driver_unregister(&afu_driver); 919 920 dfl_fpga_port_ops_del(&afu_port_ops); 921 } 922 923 module_init(afu_init); 924 module_exit(afu_exit); 925 926 MODULE_DESCRIPTION("FPGA Accelerated Function Unit driver"); 927 MODULE_AUTHOR("Intel Corporation"); 928 MODULE_LICENSE("GPL v2"); 929 MODULE_ALIAS("platform:dfl-port"); 930