drivers/fpga/dfl-afu-main.c

   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,
  87                                v & PORT_CTRL_SFTRST_ACK,
  88                                RST_POLL_INVL, RST_POLL_TIMEOUT)) {
  89                 dev_err(&pdev->dev, "timeout, fail to reset device\n");
  90                 return -ETIMEDOUT;
  91         }
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * This function resets the FPGA Port and its accelerator (AFU) by function
  98  * __port_disable and __port_enable (set port soft reset bit and then clear
  99  * it). Userspace can do Port reset at any time, e.g. during DMA or Partial
 100  * Reconfiguration. But it should never cause any system level issue, only
 101  * functional failure (e.g. DMA or PR operation failure) and be recoverable
 102  * from the failure.
 103  *
 104  * Note: the accelerator (AFU) is not accessible when its port is in reset
 105  * (disabled). Any attempts on MMIO access to AFU while in reset, will
 106  * result errors reported via port error reporting sub feature (if present).
 107  */
 108 static int __port_reset(struct platform_device *pdev)
 109 {
 110         int ret;
 111
 112         ret = __afu_port_disable(pdev);
 113         if (!ret)
 114                 __afu_port_enable(pdev);
 115
 116         return ret;
 117 }
 118
 119 static int port_reset(struct platform_device *pdev)
 120 {
 121         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 122         int ret;
 123
 124         mutex_lock(&pdata->lock);
 125         ret = __port_reset(pdev);
 126         mutex_unlock(&pdata->lock);
 127
 128         return ret;
 129 }
 130
 131 static int port_get_id(struct platform_device *pdev)
 132 {
 133         void __iomem *base;
 134
 135         base = dfl_get_feature_ioaddr_by_id(&pdev->dev, PORT_FEATURE_ID_HEADER);
 136
 137         return FIELD_GET(PORT_CAP_PORT_NUM, readq(base + PORT_HDR_CAP));
 138 }
 139
 140 static ssize_t
 141 id_show(struct device *dev, struct device_attribute *attr, char *buf)
 142 {
 143         int id = port_get_id(to_platform_device(dev));
 144
 145         return scnprintf(buf, PAGE_SIZE, "%d\n", id);
 146 }
 147 static DEVICE_ATTR_RO(id);
 148
 149 static ssize_t
 150 ltr_show(struct device *dev, struct device_attribute *attr, char *buf)
 151 {
 152         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 153         void __iomem *base;
 154         u64 v;
 155
 156         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 157
 158         mutex_lock(&pdata->lock);
 159         v = readq(base + PORT_HDR_CTRL);
 160         mutex_unlock(&pdata->lock);
 161
 162         return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_CTRL_LATENCY, v));
 163 }
 164
 165 static ssize_t
 166 ltr_store(struct device *dev, struct device_attribute *attr,
 167           const char *buf, size_t count)
 168 {
 169         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 170         void __iomem *base;
 171         bool ltr;
 172         u64 v;
 173
 174         if (kstrtobool(buf, &ltr))
 175                 return -EINVAL;
 176
 177         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 178
 179         mutex_lock(&pdata->lock);
 180         v = readq(base + PORT_HDR_CTRL);
 181         v &= ~PORT_CTRL_LATENCY;
 182         v |= FIELD_PREP(PORT_CTRL_LATENCY, ltr ? 1 : 0);
 183         writeq(v, base + PORT_HDR_CTRL);
 184         mutex_unlock(&pdata->lock);
 185
 186         return count;
 187 }
 188 static DEVICE_ATTR_RW(ltr);
 189
 190 static ssize_t
 191 ap1_event_show(struct device *dev, struct device_attribute *attr, char *buf)
 192 {
 193         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 194         void __iomem *base;
 195         u64 v;
 196
 197         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 198
 199         mutex_lock(&pdata->lock);
 200         v = readq(base + PORT_HDR_STS);
 201         mutex_unlock(&pdata->lock);
 202
 203         return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_STS_AP1_EVT, v));
 204 }
 205
 206 static ssize_t
 207 ap1_event_store(struct device *dev, struct device_attribute *attr,
 208                 const char *buf, size_t count)
 209 {
 210         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 211         void __iomem *base;
 212         bool clear;
 213
 214         if (kstrtobool(buf, &clear) || !clear)
 215                 return -EINVAL;
 216
 217         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 218
 219         mutex_lock(&pdata->lock);
 220         writeq(PORT_STS_AP1_EVT, base + PORT_HDR_STS);
 221         mutex_unlock(&pdata->lock);
 222
 223         return count;
 224 }
 225 static DEVICE_ATTR_RW(ap1_event);
 226
 227 static ssize_t
 228 ap2_event_show(struct device *dev, struct device_attribute *attr,
 229                char *buf)
 230 {
 231         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 232         void __iomem *base;
 233         u64 v;
 234
 235         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 236
 237         mutex_lock(&pdata->lock);
 238         v = readq(base + PORT_HDR_STS);
 239         mutex_unlock(&pdata->lock);
 240
 241         return sprintf(buf, "%x\n", (u8)FIELD_GET(PORT_STS_AP2_EVT, v));
 242 }
 243
 244 static ssize_t
 245 ap2_event_store(struct device *dev, struct device_attribute *attr,
 246                 const char *buf, size_t count)
 247 {
 248         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 249         void __iomem *base;
 250         bool clear;
 251
 252         if (kstrtobool(buf, &clear) || !clear)
 253                 return -EINVAL;
 254
 255         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 256
 257         mutex_lock(&pdata->lock);
 258         writeq(PORT_STS_AP2_EVT, base + PORT_HDR_STS);
 259         mutex_unlock(&pdata->lock);
 260
 261         return count;
 262 }
 263 static DEVICE_ATTR_RW(ap2_event);
 264
 265 static ssize_t
 266 power_state_show(struct device *dev, struct device_attribute *attr, char *buf)
 267 {
 268         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 269         void __iomem *base;
 270         u64 v;
 271
 272         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 273
 274         mutex_lock(&pdata->lock);
 275         v = readq(base + PORT_HDR_STS);
 276         mutex_unlock(&pdata->lock);
 277
 278         return sprintf(buf, "0x%x\n", (u8)FIELD_GET(PORT_STS_PWR_STATE, v));
 279 }
 280 static DEVICE_ATTR_RO(power_state);
 281
 282 static ssize_t
 283 userclk_freqcmd_store(struct device *dev, struct device_attribute *attr,
 284                       const char *buf, size_t count)
 285 {
 286         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 287         u64 userclk_freq_cmd;
 288         void __iomem *base;
 289
 290         if (kstrtou64(buf, 0, &userclk_freq_cmd))
 291                 return -EINVAL;
 292
 293         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 294
 295         mutex_lock(&pdata->lock);
 296         writeq(userclk_freq_cmd, base + PORT_HDR_USRCLK_CMD0);
 297         mutex_unlock(&pdata->lock);
 298
 299         return count;
 300 }
 301 static DEVICE_ATTR_WO(userclk_freqcmd);
 302
 303 static ssize_t
 304 userclk_freqcntrcmd_store(struct device *dev, struct device_attribute *attr,
 305                           const char *buf, size_t count)
 306 {
 307         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 308         u64 userclk_freqcntr_cmd;
 309         void __iomem *base;
 310
 311         if (kstrtou64(buf, 0, &userclk_freqcntr_cmd))
 312                 return -EINVAL;
 313
 314         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 315
 316         mutex_lock(&pdata->lock);
 317         writeq(userclk_freqcntr_cmd, base + PORT_HDR_USRCLK_CMD1);
 318         mutex_unlock(&pdata->lock);
 319
 320         return count;
 321 }
 322 static DEVICE_ATTR_WO(userclk_freqcntrcmd);
 323
 324 static ssize_t
 325 userclk_freqsts_show(struct device *dev, struct device_attribute *attr,
 326                      char *buf)
 327 {
 328         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 329         u64 userclk_freqsts;
 330         void __iomem *base;
 331
 332         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 333
 334         mutex_lock(&pdata->lock);
 335         userclk_freqsts = readq(base + PORT_HDR_USRCLK_STS0);
 336         mutex_unlock(&pdata->lock);
 337
 338         return sprintf(buf, "0x%llx\n", (unsigned long long)userclk_freqsts);
 339 }
 340 static DEVICE_ATTR_RO(userclk_freqsts);
 341
 342 static ssize_t
 343 userclk_freqcntrsts_show(struct device *dev, struct device_attribute *attr,
 344                          char *buf)
 345 {
 346         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 347         u64 userclk_freqcntrsts;
 348         void __iomem *base;
 349
 350         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 351
 352         mutex_lock(&pdata->lock);
 353         userclk_freqcntrsts = readq(base + PORT_HDR_USRCLK_STS1);
 354         mutex_unlock(&pdata->lock);
 355
 356         return sprintf(buf, "0x%llx\n",
 357                        (unsigned long long)userclk_freqcntrsts);
 358 }
 359 static DEVICE_ATTR_RO(userclk_freqcntrsts);
 360
 361 static struct attribute *port_hdr_attrs[] = {
 362         &dev_attr_id.attr,
 363         &dev_attr_ltr.attr,
 364         &dev_attr_ap1_event.attr,
 365         &dev_attr_ap2_event.attr,
 366         &dev_attr_power_state.attr,
 367         &dev_attr_userclk_freqcmd.attr,
 368         &dev_attr_userclk_freqcntrcmd.attr,
 369         &dev_attr_userclk_freqsts.attr,
 370         &dev_attr_userclk_freqcntrsts.attr,
 371         NULL,
 372 };
 373
 374 static umode_t port_hdr_attrs_visible(struct kobject *kobj,
 375                                       struct attribute *attr, int n)
 376 {
 377         struct device *dev = kobj_to_dev(kobj);
 378         umode_t mode = attr->mode;
 379         void __iomem *base;
 380
 381         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
 382
 383         if (dfl_feature_revision(base) > 0) {
 384                 /*
 385                  * userclk sysfs interfaces are only visible in case port
 386                  * revision is 0, as hardware with revision >0 doesn't
 387                  * support this.
 388                  */
 389                 if (attr == &dev_attr_userclk_freqcmd.attr ||
 390                     attr == &dev_attr_userclk_freqcntrcmd.attr ||
 391                     attr == &dev_attr_userclk_freqsts.attr ||
 392                     attr == &dev_attr_userclk_freqcntrsts.attr)
 393                         mode = 0;
 394         }
 395
 396         return mode;
 397 }
 398
 399 static const struct attribute_group port_hdr_group = {
 400         .attrs      = port_hdr_attrs,
 401         .is_visible = port_hdr_attrs_visible,
 402 };
 403
 404 static int port_hdr_init(struct platform_device *pdev,
 405                          struct dfl_feature *feature)
 406 {
 407         port_reset(pdev);
 408
 409         return 0;
 410 }
 411
 412 static long
 413 port_hdr_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
 414                unsigned int cmd, unsigned long arg)
 415 {
 416         long ret;
 417
 418         switch (cmd) {
 419         case DFL_FPGA_PORT_RESET:
 420                 if (!arg)
 421                         ret = port_reset(pdev);
 422                 else
 423                         ret = -EINVAL;
 424                 break;
 425         default:
 426                 dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
 427                 ret = -ENODEV;
 428         }
 429
 430         return ret;
 431 }
 432
 433 static const struct dfl_feature_id port_hdr_id_table[] = {
 434         {.id = PORT_FEATURE_ID_HEADER,},
 435         {0,}
 436 };
 437
 438 static const struct dfl_feature_ops port_hdr_ops = {
 439         .init = port_hdr_init,
 440         .ioctl = port_hdr_ioctl,
 441 };
 442
 443 static ssize_t
 444 afu_id_show(struct device *dev, struct device_attribute *attr, char *buf)
 445 {
 446         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 447         void __iomem *base;
 448         u64 guidl, guidh;
 449
 450         base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_AFU);
 451
 452         mutex_lock(&pdata->lock);
 453         if (pdata->disable_count) {
 454                 mutex_unlock(&pdata->lock);
 455                 return -EBUSY;
 456         }
 457
 458         guidl = readq(base + GUID_L);
 459         guidh = readq(base + GUID_H);
 460         mutex_unlock(&pdata->lock);
 461
 462         return scnprintf(buf, PAGE_SIZE, "%016llx%016llx\n", guidh, guidl);
 463 }
 464 static DEVICE_ATTR_RO(afu_id);
 465
 466 static struct attribute *port_afu_attrs[] = {
 467         &dev_attr_afu_id.attr,
 468         NULL
 469 };
 470
 471 static umode_t port_afu_attrs_visible(struct kobject *kobj,
 472                                       struct attribute *attr, int n)
 473 {
 474         struct device *dev = kobj_to_dev(kobj);
 475
 476         /*
 477          * sysfs entries are visible only if related private feature is
 478          * enumerated.
 479          */
 480         if (!dfl_get_feature_by_id(dev, PORT_FEATURE_ID_AFU))
 481                 return 0;
 482
 483         return attr->mode;
 484 }
 485
 486 static const struct attribute_group port_afu_group = {
 487         .attrs      = port_afu_attrs,
 488         .is_visible = port_afu_attrs_visible,
 489 };
 490
 491 static int port_afu_init(struct platform_device *pdev,
 492                          struct dfl_feature *feature)
 493 {
 494         struct resource *res = &pdev->resource[feature->resource_index];
 495
 496         return afu_mmio_region_add(dev_get_platdata(&pdev->dev),
 497                                    DFL_PORT_REGION_INDEX_AFU,
 498                                    resource_size(res), res->start,
 499                                    DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ |
 500                                    DFL_PORT_REGION_WRITE);
 501 }
 502
 503 static const struct dfl_feature_id port_afu_id_table[] = {
 504         {.id = PORT_FEATURE_ID_AFU,},
 505         {0,}
 506 };
 507
 508 static const struct dfl_feature_ops port_afu_ops = {
 509         .init = port_afu_init,
 510 };
 511
 512 static int port_stp_init(struct platform_device *pdev,
 513                          struct dfl_feature *feature)
 514 {
 515         struct resource *res = &pdev->resource[feature->resource_index];
 516
 517         return afu_mmio_region_add(dev_get_platdata(&pdev->dev),
 518                                    DFL_PORT_REGION_INDEX_STP,
 519                                    resource_size(res), res->start,
 520                                    DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ |
 521                                    DFL_PORT_REGION_WRITE);
 522 }
 523
 524 static const struct dfl_feature_id port_stp_id_table[] = {
 525         {.id = PORT_FEATURE_ID_STP,},
 526         {0,}
 527 };
 528
 529 static const struct dfl_feature_ops port_stp_ops = {
 530         .init = port_stp_init,
 531 };
 532
 533 static long
 534 port_uint_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
 535                 unsigned int cmd, unsigned long arg)
 536 {
 537         switch (cmd) {
 538         case DFL_FPGA_PORT_UINT_GET_IRQ_NUM:
 539                 return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
 540         case DFL_FPGA_PORT_UINT_SET_IRQ:
 541                 return dfl_feature_ioctl_set_irq(pdev, feature, arg);
 542         default:
 543                 dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
 544                 return -ENODEV;
 545         }
 546 }
 547
 548 static const struct dfl_feature_id port_uint_id_table[] = {
 549         {.id = PORT_FEATURE_ID_UINT,},
 550         {0,}
 551 };
 552
 553 static const struct dfl_feature_ops port_uint_ops = {
 554         .ioctl = port_uint_ioctl,
 555 };
 556
 557 static struct dfl_feature_driver port_feature_drvs[] = {
 558         {
 559                 .id_table = port_hdr_id_table,
 560                 .ops = &port_hdr_ops,
 561         },
 562         {
 563                 .id_table = port_afu_id_table,
 564                 .ops = &port_afu_ops,
 565         },
 566         {
 567                 .id_table = port_err_id_table,
 568                 .ops = &port_err_ops,
 569         },
 570         {
 571                 .id_table = port_stp_id_table,
 572                 .ops = &port_stp_ops,
 573         },
 574         {
 575                 .id_table = port_uint_id_table,
 576                 .ops = &port_uint_ops,
 577         },
 578         {
 579                 .ops = NULL,
 580         }
 581 };
 582
 583 static int afu_open(struct inode *inode, struct file *filp)
 584 {
 585         struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
 586         struct dfl_feature_platform_data *pdata;
 587         int ret;
 588
 589         pdata = dev_get_platdata(&fdev->dev);
 590         if (WARN_ON(!pdata))
 591                 return -ENODEV;
 592
 593         mutex_lock(&pdata->lock);
 594         ret = dfl_feature_dev_use_begin(pdata, filp->f_flags & O_EXCL);
 595         if (!ret) {
 596                 dev_dbg(&fdev->dev, "Device File Opened %d Times\n",
 597                         dfl_feature_dev_use_count(pdata));
 598                 filp->private_data = fdev;
 599         }
 600         mutex_unlock(&pdata->lock);
 601
 602         return ret;
 603 }
 604
 605 static int afu_release(struct inode *inode, struct file *filp)
 606 {
 607         struct platform_device *pdev = filp->private_data;
 608         struct dfl_feature_platform_data *pdata;
 609         struct dfl_feature *feature;
 610
 611         dev_dbg(&pdev->dev, "Device File Release\n");
 612
 613         pdata = dev_get_platdata(&pdev->dev);
 614
 615         mutex_lock(&pdata->lock);
 616         dfl_feature_dev_use_end(pdata);
 617
 618         if (!dfl_feature_dev_use_count(pdata)) {
 619                 dfl_fpga_dev_for_each_feature(pdata, feature)
 620                         dfl_fpga_set_irq_triggers(feature, 0,
 621                                                   feature->nr_irqs, NULL);
 622                 __port_reset(pdev);
 623                 afu_dma_region_destroy(pdata);
 624         }
 625         mutex_unlock(&pdata->lock);
 626
 627         return 0;
 628 }
 629
 630 static long afu_ioctl_check_extension(struct dfl_feature_platform_data *pdata,
 631                                       unsigned long arg)
 632 {
 633         /* No extension support for now */
 634         return 0;
 635 }
 636
 637 static long
 638 afu_ioctl_get_info(struct dfl_feature_platform_data *pdata, void __user *arg)
 639 {
 640         struct dfl_fpga_port_info info;
 641         struct dfl_afu *afu;
 642         unsigned long minsz;
 643
 644         minsz = offsetofend(struct dfl_fpga_port_info, num_umsgs);
 645
 646         if (copy_from_user(&info, arg, minsz))
 647                 return -EFAULT;
 648
 649         if (info.argsz < minsz)
 650                 return -EINVAL;
 651
 652         mutex_lock(&pdata->lock);
 653         afu = dfl_fpga_pdata_get_private(pdata);
 654         info.flags = 0;
 655         info.num_regions = afu->num_regions;
 656         info.num_umsgs = afu->num_umsgs;
 657         mutex_unlock(&pdata->lock);
 658
 659         if (copy_to_user(arg, &info, sizeof(info)))
 660                 return -EFAULT;
 661
 662         return 0;
 663 }
 664
 665 static long afu_ioctl_get_region_info(struct dfl_feature_platform_data *pdata,
 666                                       void __user *arg)
 667 {
 668         struct dfl_fpga_port_region_info rinfo;
 669         struct dfl_afu_mmio_region region;
 670         unsigned long minsz;
 671         long ret;
 672
 673         minsz = offsetofend(struct dfl_fpga_port_region_info, offset);
 674
 675         if (copy_from_user(&rinfo, arg, minsz))
 676                 return -EFAULT;
 677
 678         if (rinfo.argsz < minsz || rinfo.padding)
 679                 return -EINVAL;
 680
 681         ret = afu_mmio_region_get_by_index(pdata, rinfo.index, &region);
 682         if (ret)
 683                 return ret;
 684
 685         rinfo.flags = region.flags;
 686         rinfo.size = region.size;
 687         rinfo.offset = region.offset;
 688
 689         if (copy_to_user(arg, &rinfo, sizeof(rinfo)))
 690                 return -EFAULT;
 691
 692         return 0;
 693 }
 694
 695 static long
 696 afu_ioctl_dma_map(struct dfl_feature_platform_data *pdata, void __user *arg)
 697 {
 698         struct dfl_fpga_port_dma_map map;
 699         unsigned long minsz;
 700         long ret;
 701
 702         minsz = offsetofend(struct dfl_fpga_port_dma_map, iova);
 703
 704         if (copy_from_user(&map, arg, minsz))
 705                 return -EFAULT;
 706
 707         if (map.argsz < minsz || map.flags)
 708                 return -EINVAL;
 709
 710         ret = afu_dma_map_region(pdata, map.user_addr, map.length, &map.iova);
 711         if (ret)
 712                 return ret;
 713
 714         if (copy_to_user(arg, &map, sizeof(map))) {
 715                 afu_dma_unmap_region(pdata, map.iova);
 716                 return -EFAULT;
 717         }
 718
 719         dev_dbg(&pdata->dev->dev, "dma map: ua=%llx, len=%llx, iova=%llx\n",
 720                 (unsigned long long)map.user_addr,
 721                 (unsigned long long)map.length,
 722                 (unsigned long long)map.iova);
 723
 724         return 0;
 725 }
 726
 727 static long
 728 afu_ioctl_dma_unmap(struct dfl_feature_platform_data *pdata, void __user *arg)
 729 {
 730         struct dfl_fpga_port_dma_unmap unmap;
 731         unsigned long minsz;
 732
 733         minsz = offsetofend(struct dfl_fpga_port_dma_unmap, iova);
 734
 735         if (copy_from_user(&unmap, arg, minsz))
 736                 return -EFAULT;
 737
 738         if (unmap.argsz < minsz || unmap.flags)
 739                 return -EINVAL;
 740
 741         return afu_dma_unmap_region(pdata, unmap.iova);
 742 }
 743
 744 static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 745 {
 746         struct platform_device *pdev = filp->private_data;
 747         struct dfl_feature_platform_data *pdata;
 748         struct dfl_feature *f;
 749         long ret;
 750
 751         dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
 752
 753         pdata = dev_get_platdata(&pdev->dev);
 754
 755         switch (cmd) {
 756         case DFL_FPGA_GET_API_VERSION:
 757                 return DFL_FPGA_API_VERSION;
 758         case DFL_FPGA_CHECK_EXTENSION:
 759                 return afu_ioctl_check_extension(pdata, arg);
 760         case DFL_FPGA_PORT_GET_INFO:
 761                 return afu_ioctl_get_info(pdata, (void __user *)arg);
 762         case DFL_FPGA_PORT_GET_REGION_INFO:
 763                 return afu_ioctl_get_region_info(pdata, (void __user *)arg);
 764         case DFL_FPGA_PORT_DMA_MAP:
 765                 return afu_ioctl_dma_map(pdata, (void __user *)arg);
 766         case DFL_FPGA_PORT_DMA_UNMAP:
 767                 return afu_ioctl_dma_unmap(pdata, (void __user *)arg);
 768         default:
 769                 /*
 770                  * Let sub-feature's ioctl function to handle the cmd
 771                  * Sub-feature's ioctl returns -ENODEV when cmd is not
 772                  * handled in this sub feature, and returns 0 and other
 773                  * error code if cmd is handled.
 774                  */
 775                 dfl_fpga_dev_for_each_feature(pdata, f)
 776                         if (f->ops && f->ops->ioctl) {
 777                                 ret = f->ops->ioctl(pdev, f, cmd, arg);
 778                                 if (ret != -ENODEV)
 779                                         return ret;
 780                         }
 781         }
 782
 783         return -EINVAL;
 784 }
 785
 786 static const struct vm_operations_struct afu_vma_ops = {
 787 #ifdef CONFIG_HAVE_IOREMAP_PROT
 788         .access = generic_access_phys,
 789 #endif
 790 };
 791
 792 static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
 793 {
 794         struct platform_device *pdev = filp->private_data;
 795         struct dfl_feature_platform_data *pdata;
 796         u64 size = vma->vm_end - vma->vm_start;
 797         struct dfl_afu_mmio_region region;
 798         u64 offset;
 799         int ret;
 800
 801         if (!(vma->vm_flags & VM_SHARED))
 802                 return -EINVAL;
 803
 804         pdata = dev_get_platdata(&pdev->dev);
 805
 806         offset = vma->vm_pgoff << PAGE_SHIFT;
 807         ret = afu_mmio_region_get_by_offset(pdata, offset, size, &region);
 808         if (ret)
 809                 return ret;
 810
 811         if (!(region.flags & DFL_PORT_REGION_MMAP))
 812                 return -EINVAL;
 813
 814         if ((vma->vm_flags & VM_READ) && !(region.flags & DFL_PORT_REGION_READ))
 815                 return -EPERM;
 816
 817         if ((vma->vm_flags & VM_WRITE) &&
 818             !(region.flags & DFL_PORT_REGION_WRITE))
 819                 return -EPERM;
 820
 821         /* Support debug access to the mapping */
 822         vma->vm_ops = &afu_vma_ops;
 823
 824         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 825
 826         return remap_pfn_range(vma, vma->vm_start,
 827                         (region.phys + (offset - region.offset)) >> PAGE_SHIFT,
 828                         size, vma->vm_page_prot);
 829 }
 830
 831 static const struct file_operations afu_fops = {
 832         .owner = THIS_MODULE,
 833         .open = afu_open,
 834         .release = afu_release,
 835         .unlocked_ioctl = afu_ioctl,
 836         .mmap = afu_mmap,
 837 };
 838
 839 static int afu_dev_init(struct platform_device *pdev)
 840 {
 841         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 842         struct dfl_afu *afu;
 843
 844         afu = devm_kzalloc(&pdev->dev, sizeof(*afu), GFP_KERNEL);
 845         if (!afu)
 846                 return -ENOMEM;
 847
 848         afu->pdata = pdata;
 849
 850         mutex_lock(&pdata->lock);
 851         dfl_fpga_pdata_set_private(pdata, afu);
 852         afu_mmio_region_init(pdata);
 853         afu_dma_region_init(pdata);
 854         mutex_unlock(&pdata->lock);
 855
 856         return 0;
 857 }
 858
 859 static int afu_dev_destroy(struct platform_device *pdev)
 860 {
 861         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 862
 863         mutex_lock(&pdata->lock);
 864         afu_mmio_region_destroy(pdata);
 865         afu_dma_region_destroy(pdata);
 866         dfl_fpga_pdata_set_private(pdata, NULL);
 867         mutex_unlock(&pdata->lock);
 868
 869         return 0;
 870 }
 871
 872 static int port_enable_set(struct platform_device *pdev, bool enable)
 873 {
 874         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 875         int ret = 0;
 876
 877         mutex_lock(&pdata->lock);
 878         if (enable)
 879                 __afu_port_enable(pdev);
 880         else
 881                 ret = __afu_port_disable(pdev);
 882         mutex_unlock(&pdata->lock);
 883
 884         return ret;
 885 }
 886
 887 static struct dfl_fpga_port_ops afu_port_ops = {
 888         .name = DFL_FPGA_FEATURE_DEV_PORT,
 889         .owner = THIS_MODULE,
 890         .get_id = port_get_id,
 891         .enable_set = port_enable_set,
 892 };
 893
 894 static int afu_probe(struct platform_device *pdev)
 895 {
 896         int ret;
 897
 898         dev_dbg(&pdev->dev, "%s\n", __func__);
 899
 900         ret = afu_dev_init(pdev);
 901         if (ret)
 902                 goto exit;
 903
 904         ret = dfl_fpga_dev_feature_init(pdev, port_feature_drvs);
 905         if (ret)
 906                 goto dev_destroy;
 907
 908         ret = dfl_fpga_dev_ops_register(pdev, &afu_fops, THIS_MODULE);
 909         if (ret) {
 910                 dfl_fpga_dev_feature_uinit(pdev);
 911                 goto dev_destroy;
 912         }
 913
 914         return 0;
 915
 916 dev_destroy:
 917         afu_dev_destroy(pdev);
 918 exit:
 919         return ret;
 920 }
 921
 922 static int afu_remove(struct platform_device *pdev)
 923 {
 924         dev_dbg(&pdev->dev, "%s\n", __func__);
 925
 926         dfl_fpga_dev_ops_unregister(pdev);
 927         dfl_fpga_dev_feature_uinit(pdev);
 928         afu_dev_destroy(pdev);
 929
 930         return 0;
 931 }
 932
 933 static const struct attribute_group *afu_dev_groups[] = {
 934         &port_hdr_group,
 935         &port_afu_group,
 936         &port_err_group,
 937         NULL
 938 };
 939
 940 static struct platform_driver afu_driver = {
 941         .driver = {
 942                 .name       = DFL_FPGA_FEATURE_DEV_PORT,
 943                 .dev_groups = afu_dev_groups,
 944         },
 945         .probe   = afu_probe,
 946         .remove  = afu_remove,
 947 };
 948
 949 static int __init afu_init(void)
 950 {
 951         int ret;
 952
 953         dfl_fpga_port_ops_add(&afu_port_ops);
 954
 955         ret = platform_driver_register(&afu_driver);
 956         if (ret)
 957                 dfl_fpga_port_ops_del(&afu_port_ops);
 958
 959         return ret;
 960 }
 961
 962 static void __exit afu_exit(void)
 963 {
 964         platform_driver_unregister(&afu_driver);
 965
 966         dfl_fpga_port_ops_del(&afu_port_ops);
 967 }
 968
 969 module_init(afu_init);
 970 module_exit(afu_exit);
 971
 972 MODULE_DESCRIPTION("FPGA Accelerated Function Unit driver");
 973 MODULE_AUTHOR("Intel Corporation");
 974 MODULE_LICENSE("GPL v2");
 975 MODULE_ALIAS("platform:dfl-port");