drivers/usb/usbip/vudc_dev.c

   1 /*
   2  * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
   3  * Copyright (C) 2015-2016 Samsung Electronics
   4  *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
   5  *               Krzysztof Opasiak <k.opasiak@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/list.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/gadget.h>
  27 #include <linux/usb/hcd.h>
  28 #include <linux/kthread.h>
  29 #include <linux/file.h>
  30 #include <linux/byteorder/generic.h>
  31
  32 #include "usbip_common.h"
  33 #include "vudc.h"
  34
  35 #define VIRTUAL_ENDPOINTS (1 /* ep0 */ + 15 /* in eps */ + 15 /* out eps */)
  36
  37 /* urb-related structures alloc / free */
  38
  39
  40 static void free_urb(struct urb *urb)
  41 {
  42         if (!urb)
  43                 return;
  44
  45         kfree(urb->setup_packet);
  46         urb->setup_packet = NULL;
  47
  48         kfree(urb->transfer_buffer);
  49         urb->transfer_buffer = NULL;
  50
  51         usb_free_urb(urb);
  52 }
  53
  54 struct urbp *alloc_urbp(void)
  55 {
  56         struct urbp *urb_p;
  57
  58         urb_p = kzalloc(sizeof(*urb_p), GFP_KERNEL);
  59         if (!urb_p)
  60                 return urb_p;
  61
  62         urb_p->urb = NULL;
  63         urb_p->ep = NULL;
  64         INIT_LIST_HEAD(&urb_p->urb_entry);
  65         return urb_p;
  66 }
  67
  68 static void free_urbp(struct urbp *urb_p)
  69 {
  70         kfree(urb_p);
  71 }
  72
  73 void free_urbp_and_urb(struct urbp *urb_p)
  74 {
  75         if (!urb_p)
  76                 return;
  77         free_urb(urb_p->urb);
  78         free_urbp(urb_p);
  79 }
  80
  81
  82 /* utilities ; almost verbatim from dummy_hcd.c */
  83
  84 /* called with spinlock held */
  85 static void nuke(struct vudc *udc, struct vep *ep)
  86 {
  87         struct vrequest *req;
  88
  89         while (!list_empty(&ep->req_queue)) {
  90                 req = list_first_entry(&ep->req_queue, struct vrequest,
  91                                        req_entry);
  92                 list_del_init(&req->req_entry);
  93                 req->req.status = -ESHUTDOWN;
  94
  95                 spin_unlock(&udc->lock);
  96                 usb_gadget_giveback_request(&ep->ep, &req->req);
  97                 spin_lock(&udc->lock);
  98         }
  99 }
 100
 101 /* caller must hold lock */
 102 static void stop_activity(struct vudc *udc)
 103 {
 104         int i;
 105         struct urbp *urb_p, *tmp;
 106
 107         udc->address = 0;
 108
 109         for (i = 0; i < VIRTUAL_ENDPOINTS; i++)
 110                 nuke(udc, &udc->ep[i]);
 111
 112         list_for_each_entry_safe(urb_p, tmp, &udc->urb_queue, urb_entry) {
 113                 list_del(&urb_p->urb_entry);
 114                 free_urbp_and_urb(urb_p);
 115         }
 116 }
 117
 118 struct vep *vudc_find_endpoint(struct vudc *udc, u8 address)
 119 {
 120         int i;
 121
 122         if ((address & ~USB_DIR_IN) == 0)
 123                 return &udc->ep[0];
 124
 125         for (i = 1; i < VIRTUAL_ENDPOINTS; i++) {
 126                 struct vep *ep = &udc->ep[i];
 127
 128                 if (!ep->desc)
 129                         continue;
 130                 if (ep->desc->bEndpointAddress == address)
 131                         return ep;
 132         }
 133         return NULL;
 134 }
 135
 136 /* gadget ops */
 137
 138 /* FIXME - this will probably misbehave when suspend/resume is added */
 139 static int vgadget_get_frame(struct usb_gadget *_gadget)
 140 {
 141         struct timeval now;
 142         struct vudc *udc = usb_gadget_to_vudc(_gadget);
 143
 144         do_gettimeofday(&now);
 145         return ((now.tv_sec - udc->start_time.tv_sec) * 1000 +
 146                         (now.tv_usec - udc->start_time.tv_usec) / 1000)
 147                         % 0x7FF;
 148 }
 149
 150 static int vgadget_set_selfpowered(struct usb_gadget *_gadget, int value)
 151 {
 152         struct vudc *udc = usb_gadget_to_vudc(_gadget);
 153
 154         if (value)
 155                 udc->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 156         else
 157                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 158         return 0;
 159 }
 160
 161 static int vgadget_pullup(struct usb_gadget *_gadget, int value)
 162 {
 163         struct vudc *udc = usb_gadget_to_vudc(_gadget);
 164         unsigned long flags;
 165         int ret;
 166
 167
 168         spin_lock_irqsave(&udc->lock, flags);
 169         value = !!value;
 170         if (value == udc->pullup)
 171                 goto unlock;
 172
 173         udc->pullup = value;
 174         if (value) {
 175                 udc->gadget.speed = min_t(u8, USB_SPEED_HIGH,
 176                                            udc->driver->max_speed);
 177                 udc->ep[0].ep.maxpacket = 64;
 178                 /*
 179                  * This is the first place where we can ask our
 180                  * gadget driver for descriptors.
 181                  */
 182                 ret = get_gadget_descs(udc);
 183                 if (ret) {
 184                         dev_err(&udc->gadget.dev, "Unable go get desc: %d", ret);
 185                         goto unlock;
 186                 }
 187
 188                 spin_unlock_irqrestore(&udc->lock, flags);
 189                 usbip_start_eh(&udc->ud);
 190         } else {
 191                 /* Invalidate descriptors */
 192                 udc->desc_cached = 0;
 193
 194                 spin_unlock_irqrestore(&udc->lock, flags);
 195                 usbip_event_add(&udc->ud, VUDC_EVENT_REMOVED);
 196                 usbip_stop_eh(&udc->ud); /* Wait for eh completion */
 197         }
 198
 199         return 0;
 200
 201 unlock:
 202         spin_unlock_irqrestore(&udc->lock, flags);
 203         return 0;
 204 }
 205
 206 static int vgadget_udc_start(struct usb_gadget *g,
 207                 struct usb_gadget_driver *driver)
 208 {
 209         struct vudc *udc = usb_gadget_to_vudc(g);
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&udc->lock, flags);
 213         udc->driver = driver;
 214         udc->pullup = udc->connected = udc->desc_cached = 0;
 215         spin_unlock_irqrestore(&udc->lock, flags);
 216
 217         return 0;
 218 }
 219
 220 static int vgadget_udc_stop(struct usb_gadget *g)
 221 {
 222         struct vudc *udc = usb_gadget_to_vudc(g);
 223         unsigned long flags;
 224
 225         spin_lock_irqsave(&udc->lock, flags);
 226         udc->driver = NULL;
 227         spin_unlock_irqrestore(&udc->lock, flags);
 228         return 0;
 229 }
 230
 231 static const struct usb_gadget_ops vgadget_ops = {
 232         .get_frame      = vgadget_get_frame,
 233         .set_selfpowered = vgadget_set_selfpowered,
 234         .pullup         = vgadget_pullup,
 235         .udc_start      = vgadget_udc_start,
 236         .udc_stop       = vgadget_udc_stop,
 237 };
 238
 239
 240 /* endpoint ops */
 241
 242 static int vep_enable(struct usb_ep *_ep,
 243                 const struct usb_endpoint_descriptor *desc)
 244 {
 245         struct vep *ep;
 246         struct vudc *udc;
 247         unsigned maxp;
 248         unsigned long flags;
 249
 250         ep = to_vep(_ep);
 251         udc = ep_to_vudc(ep);
 252
 253         if (!_ep || !desc || ep->desc || _ep->caps.type_control
 254                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 255                 return -EINVAL;
 256
 257         if (!udc->driver)
 258                 return -ESHUTDOWN;
 259
 260         spin_lock_irqsave(&udc->lock, flags);
 261
 262         maxp = usb_endpoint_maxp(desc) & 0x7ff;
 263         _ep->maxpacket = maxp;
 264         ep->desc = desc;
 265         ep->type = usb_endpoint_type(desc);
 266         ep->halted = ep->wedged = 0;
 267
 268         spin_unlock_irqrestore(&udc->lock, flags);
 269
 270         return 0;
 271 }
 272
 273 static int vep_disable(struct usb_ep *_ep)
 274 {
 275         struct vep *ep;
 276         struct vudc *udc;
 277         unsigned long flags;
 278
 279         ep = to_vep(_ep);
 280         udc = ep_to_vudc(ep);
 281         if (!_ep || !ep->desc || _ep->caps.type_control)
 282                 return -EINVAL;
 283
 284         spin_lock_irqsave(&udc->lock, flags);
 285         ep->desc = NULL;
 286         nuke(udc, ep);
 287         spin_unlock_irqrestore(&udc->lock, flags);
 288
 289         return 0;
 290 }
 291
 292 static struct usb_request *vep_alloc_request(struct usb_ep *_ep,
 293                 gfp_t mem_flags)
 294 {
 295         struct vep *ep;
 296         struct vrequest *req;
 297
 298         if (!_ep)
 299                 return NULL;
 300         ep = to_vep(_ep);
 301
 302         req = kzalloc(sizeof(*req), mem_flags);
 303         if (!req)
 304                 return NULL;
 305
 306         INIT_LIST_HEAD(&req->req_entry);
 307
 308         return &req->req;
 309 }
 310
 311 static void vep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 312 {
 313         struct vrequest *req;
 314
 315         if (WARN_ON(!_ep || !_req))
 316                 return;
 317
 318         req = to_vrequest(_req);
 319         kfree(req);
 320 }
 321
 322 static int vep_queue(struct usb_ep *_ep, struct usb_request *_req,
 323                 gfp_t mem_flags)
 324 {
 325         struct vep *ep;
 326         struct vrequest *req;
 327         struct vudc *udc;
 328         unsigned long flags;
 329
 330         if (!_ep || !_req)
 331                 return -EINVAL;
 332
 333         ep = to_vep(_ep);
 334         req = to_vrequest(_req);
 335         udc = ep_to_vudc(ep);
 336
 337         spin_lock_irqsave(&udc->lock, flags);
 338         _req->actual = 0;
 339         _req->status = -EINPROGRESS;
 340
 341         list_add_tail(&req->req_entry, &ep->req_queue);
 342         spin_unlock_irqrestore(&udc->lock, flags);
 343
 344         return 0;
 345 }
 346
 347 static int vep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 348 {
 349         struct vep *ep;
 350         struct vrequest *req;
 351         struct vudc *udc;
 352         struct vrequest *lst;
 353         unsigned long flags;
 354         int ret = -EINVAL;
 355
 356         if (!_ep || !_req)
 357                 return ret;
 358
 359         ep = to_vep(_ep);
 360         req = to_vrequest(_req);
 361         udc = req->udc;
 362
 363         if (!udc->driver)
 364                 return -ESHUTDOWN;
 365
 366         spin_lock_irqsave(&udc->lock, flags);
 367         list_for_each_entry(lst, &ep->req_queue, req_entry) {
 368                 if (&lst->req == _req) {
 369                         list_del_init(&lst->req_entry);
 370                         _req->status = -ECONNRESET;
 371                         ret = 0;
 372                         break;
 373                 }
 374         }
 375         spin_unlock_irqrestore(&udc->lock, flags);
 376
 377         if (ret == 0)
 378                 usb_gadget_giveback_request(_ep, _req);
 379
 380         return ret;
 381 }
 382
 383 static int
 384 vep_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 385 {
 386         struct vep *ep;
 387         struct vudc *udc;
 388         unsigned long flags;
 389         int ret = 0;
 390
 391         ep = to_vep(_ep);
 392         if (!_ep)
 393                 return -EINVAL;
 394
 395         udc = ep_to_vudc(ep);
 396         if (!udc->driver)
 397                 return -ESHUTDOWN;
 398
 399         spin_lock_irqsave(&udc->lock, flags);
 400         if (!value)
 401                 ep->halted = ep->wedged = 0;
 402         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 403                         !list_empty(&ep->req_queue))
 404                 ret = -EAGAIN;
 405         else {
 406                 ep->halted = 1;
 407                 if (wedged)
 408                         ep->wedged = 1;
 409         }
 410
 411         spin_unlock_irqrestore(&udc->lock, flags);
 412         return ret;
 413 }
 414
 415 static int
 416 vep_set_halt(struct usb_ep *_ep, int value)
 417 {
 418         return vep_set_halt_and_wedge(_ep, value, 0);
 419 }
 420
 421 static int vep_set_wedge(struct usb_ep *_ep)
 422 {
 423         return vep_set_halt_and_wedge(_ep, 1, 1);
 424 }
 425
 426 static const struct usb_ep_ops vep_ops = {
 427         .enable         = vep_enable,
 428         .disable        = vep_disable,
 429
 430         .alloc_request  = vep_alloc_request,
 431         .free_request   = vep_free_request,
 432
 433         .queue          = vep_queue,
 434         .dequeue        = vep_dequeue,
 435
 436         .set_halt       = vep_set_halt,
 437         .set_wedge      = vep_set_wedge,
 438 };
 439
 440
 441 /* shutdown / reset / error handlers */
 442
 443 static void vudc_shutdown(struct usbip_device *ud)
 444 {
 445         struct vudc *udc = container_of(ud, struct vudc, ud);
 446         int call_disconnect = 0;
 447         unsigned long flags;
 448
 449         dev_dbg(&udc->pdev->dev, "device shutdown");
 450         if (ud->tcp_socket)
 451                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 452
 453         if (ud->tcp_tx) {
 454                 kthread_stop_put(ud->tcp_rx);
 455                 ud->tcp_rx = NULL;
 456         }
 457         if (ud->tcp_tx) {
 458                 kthread_stop_put(ud->tcp_tx);
 459                 ud->tcp_tx = NULL;
 460         }
 461
 462         if (ud->tcp_socket) {
 463                 sockfd_put(ud->tcp_socket);
 464                 ud->tcp_socket = NULL;
 465         }
 466
 467         spin_lock_irqsave(&udc->lock, flags);
 468         stop_activity(udc);
 469         if (udc->connected && udc->driver->disconnect)
 470                 call_disconnect = 1;
 471         udc->connected = 0;
 472         spin_unlock_irqrestore(&udc->lock, flags);
 473         if (call_disconnect)
 474                 udc->driver->disconnect(&udc->gadget);
 475 }
 476
 477 static void vudc_device_reset(struct usbip_device *ud)
 478 {
 479         struct vudc *udc = container_of(ud, struct vudc, ud);
 480         unsigned long flags;
 481
 482         dev_dbg(&udc->pdev->dev, "device reset");
 483         spin_lock_irqsave(&udc->lock, flags);
 484         stop_activity(udc);
 485         spin_unlock_irqrestore(&udc->lock, flags);
 486         if (udc->driver)
 487                 usb_gadget_udc_reset(&udc->gadget, udc->driver);
 488         spin_lock_irqsave(&ud->lock, flags);
 489         ud->status = SDEV_ST_AVAILABLE;
 490         spin_unlock_irqrestore(&ud->lock, flags);
 491 }
 492
 493 static void vudc_device_unusable(struct usbip_device *ud)
 494 {
 495         unsigned long flags;
 496
 497         spin_lock_irqsave(&ud->lock, flags);
 498         ud->status = SDEV_ST_ERROR;
 499         spin_unlock_irqrestore(&ud->lock, flags);
 500 }
 501
 502 /* device setup / cleanup */
 503
 504 struct vudc_device *alloc_vudc_device(int devid)
 505 {
 506         struct vudc_device *udc_dev = NULL;
 507
 508         udc_dev = kzalloc(sizeof(*udc_dev), GFP_KERNEL);
 509         if (!udc_dev)
 510                 goto out;
 511
 512         INIT_LIST_HEAD(&udc_dev->dev_entry);
 513
 514         udc_dev->pdev = platform_device_alloc(GADGET_NAME, devid);
 515         if (!udc_dev->pdev) {
 516                 kfree(udc_dev);
 517                 udc_dev = NULL;
 518         }
 519
 520 out:
 521         return udc_dev;
 522 }
 523
 524 void put_vudc_device(struct vudc_device *udc_dev)
 525 {
 526         platform_device_put(udc_dev->pdev);
 527         kfree(udc_dev);
 528 }
 529
 530 static int init_vudc_hw(struct vudc *udc)
 531 {
 532         int i;
 533         struct usbip_device *ud = &udc->ud;
 534         struct vep *ep;
 535
 536         udc->ep = kcalloc(VIRTUAL_ENDPOINTS, sizeof(*udc->ep), GFP_KERNEL);
 537         if (!udc->ep)
 538                 goto nomem_ep;
 539
 540         INIT_LIST_HEAD(&udc->gadget.ep_list);
 541
 542         /* create ep0 and 15 in, 15 out general purpose eps */
 543         for (i = 0; i < VIRTUAL_ENDPOINTS; ++i) {
 544                 int is_out = i % 2;
 545                 int num = (i + 1) / 2;
 546
 547                 ep = &udc->ep[i];
 548
 549                 sprintf(ep->name, "ep%d%s", num,
 550                         i ? (is_out ? "out" : "in") : "");
 551                 ep->ep.name = ep->name;
 552                 if (i == 0) {
 553                         ep->ep.caps.type_control = true;
 554                         ep->ep.caps.dir_out = true;
 555                         ep->ep.caps.dir_in = true;
 556                 } else {
 557                         ep->ep.caps.type_iso = true;
 558                         ep->ep.caps.type_int = true;
 559                         ep->ep.caps.type_bulk = true;
 560                 }
 561
 562                 if (is_out)
 563                         ep->ep.caps.dir_out = true;
 564                 else
 565                         ep->ep.caps.dir_in = true;
 566
 567                 ep->ep.ops = &vep_ops;
 568                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 569                 ep->halted = ep->wedged = ep->already_seen =
 570                         ep->setup_stage = 0;
 571                 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 572                 ep->ep.max_streams = 16;
 573                 ep->gadget = &udc->gadget;
 574                 ep->desc = NULL;
 575                 INIT_LIST_HEAD(&ep->req_queue);
 576         }
 577
 578         spin_lock_init(&udc->lock);
 579         spin_lock_init(&udc->lock_tx);
 580         INIT_LIST_HEAD(&udc->urb_queue);
 581         INIT_LIST_HEAD(&udc->tx_queue);
 582         init_waitqueue_head(&udc->tx_waitq);
 583
 584         spin_lock_init(&ud->lock);
 585         ud->status = SDEV_ST_AVAILABLE;
 586         ud->side = USBIP_VUDC;
 587
 588         ud->eh_ops.shutdown = vudc_shutdown;
 589         ud->eh_ops.reset    = vudc_device_reset;
 590         ud->eh_ops.unusable = vudc_device_unusable;
 591
 592         udc->gadget.ep0 = &udc->ep[0].ep;
 593         list_del_init(&udc->ep[0].ep.ep_list);
 594
 595         v_init_timer(udc);
 596         return 0;
 597
 598 nomem_ep:
 599                 return -ENOMEM;
 600 }
 601
 602 static void cleanup_vudc_hw(struct vudc *udc)
 603 {
 604         kfree(udc->ep);
 605 }
 606
 607 /* platform driver ops */
 608
 609 int vudc_probe(struct platform_device *pdev)
 610 {
 611         struct vudc *udc;
 612         int ret = -ENOMEM;
 613
 614         udc = kzalloc(sizeof(*udc), GFP_KERNEL);
 615         if (!udc)
 616                 goto out;
 617
 618         udc->gadget.name = GADGET_NAME;
 619         udc->gadget.ops = &vgadget_ops;
 620         udc->gadget.max_speed = USB_SPEED_HIGH;
 621         udc->gadget.dev.parent = &pdev->dev;
 622         udc->pdev = pdev;
 623
 624         ret = init_vudc_hw(udc);
 625         if (ret)
 626                 goto err_init_vudc_hw;
 627
 628         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
 629         if (ret < 0)
 630                 goto err_add_udc;
 631
 632         ret = sysfs_create_group(&pdev->dev.kobj, &vudc_attr_group);
 633         if (ret) {
 634                 dev_err(&udc->pdev->dev, "create sysfs files\n");
 635                 goto err_sysfs;
 636         }
 637
 638         platform_set_drvdata(pdev, udc);
 639
 640         return ret;
 641
 642 err_sysfs:
 643         usb_del_gadget_udc(&udc->gadget);
 644 err_add_udc:
 645         cleanup_vudc_hw(udc);
 646 err_init_vudc_hw:
 647         kfree(udc);
 648 out:
 649         return ret;
 650 }
 651
 652 int vudc_remove(struct platform_device *pdev)
 653 {
 654         struct vudc *udc = platform_get_drvdata(pdev);
 655
 656         sysfs_remove_group(&pdev->dev.kobj, &vudc_attr_group);
 657         usb_del_gadget_udc(&udc->gadget);
 658         cleanup_vudc_hw(udc);
 659         kfree(udc);
 660         return 0;
 661 }