drivers/usb/usbip/vhci_hcd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   4  * Copyright (C) 2015-2016 Nobuo Iwata
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/file.h>
   9 #include <linux/kernel.h>
  10 #include <linux/kthread.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14
  15 #include "usbip_common.h"
  16 #include "vhci.h"
  17
  18 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
  19 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
  20
  21 /*
  22  * TODO
  23  *      - update root hub emulation
  24  *      - move the emulation code to userland ?
  25  *              porting to other operating systems
  26  *              minimize kernel code
  27  *      - add suspend/resume code
  28  *      - clean up everything
  29  */
  30
  31 /* See usb gadget dummy hcd */
  32
  33 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
  34 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  35                             u16 wIndex, char *buff, u16 wLength);
  36 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  37                             gfp_t mem_flags);
  38 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
  39 static int vhci_start(struct usb_hcd *vhci_hcd);
  40 static void vhci_stop(struct usb_hcd *hcd);
  41 static int vhci_get_frame_number(struct usb_hcd *hcd);
  42
  43 static const char driver_name[] = "vhci_hcd";
  44 static const char driver_desc[] = "USB/IP Virtual Host Controller";
  45
  46 int vhci_num_controllers = VHCI_NR_HCS;
  47 struct vhci *vhcis;
  48
  49 static const char * const bit_desc[] = {
  50         "CONNECTION",           /*0*/
  51         "ENABLE",               /*1*/
  52         "SUSPEND",              /*2*/
  53         "OVER_CURRENT",         /*3*/
  54         "RESET",                /*4*/
  55         "L1",                   /*5*/
  56         "R6",                   /*6*/
  57         "R7",                   /*7*/
  58         "POWER",                /*8*/
  59         "LOWSPEED",             /*9*/
  60         "HIGHSPEED",            /*10*/
  61         "PORT_TEST",            /*11*/
  62         "INDICATOR",            /*12*/
  63         "R13",                  /*13*/
  64         "R14",                  /*14*/
  65         "R15",                  /*15*/
  66         "C_CONNECTION",         /*16*/
  67         "C_ENABLE",             /*17*/
  68         "C_SUSPEND",            /*18*/
  69         "C_OVER_CURRENT",       /*19*/
  70         "C_RESET",              /*20*/
  71         "C_L1",                 /*21*/
  72         "R22",                  /*22*/
  73         "R23",                  /*23*/
  74         "R24",                  /*24*/
  75         "R25",                  /*25*/
  76         "R26",                  /*26*/
  77         "R27",                  /*27*/
  78         "R28",                  /*28*/
  79         "R29",                  /*29*/
  80         "R30",                  /*30*/
  81         "R31",                  /*31*/
  82 };
  83
  84 static const char * const bit_desc_ss[] = {
  85         "CONNECTION",           /*0*/
  86         "ENABLE",               /*1*/
  87         "SUSPEND",              /*2*/
  88         "OVER_CURRENT",         /*3*/
  89         "RESET",                /*4*/
  90         "L1",                   /*5*/
  91         "R6",                   /*6*/
  92         "R7",                   /*7*/
  93         "R8",                   /*8*/
  94         "POWER",                /*9*/
  95         "HIGHSPEED",            /*10*/
  96         "PORT_TEST",            /*11*/
  97         "INDICATOR",            /*12*/
  98         "R13",                  /*13*/
  99         "R14",                  /*14*/
 100         "R15",                  /*15*/
 101         "C_CONNECTION",         /*16*/
 102         "C_ENABLE",             /*17*/
 103         "C_SUSPEND",            /*18*/
 104         "C_OVER_CURRENT",       /*19*/
 105         "C_RESET",              /*20*/
 106         "C_BH_RESET",           /*21*/
 107         "C_LINK_STATE",         /*22*/
 108         "C_CONFIG_ERROR",       /*23*/
 109         "R24",                  /*24*/
 110         "R25",                  /*25*/
 111         "R26",                  /*26*/
 112         "R27",                  /*27*/
 113         "R28",                  /*28*/
 114         "R29",                  /*29*/
 115         "R30",                  /*30*/
 116         "R31",                  /*31*/
 117 };
 118
 119 static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3)
 120 {
 121         int i = 0;
 122         u32 bit = 1;
 123         const char * const *desc = bit_desc;
 124
 125         if (usb3)
 126                 desc = bit_desc_ss;
 127
 128         pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
 129         while (bit) {
 130                 u32 prev = prev_status & bit;
 131                 u32 new = new_status & bit;
 132                 char change;
 133
 134                 if (!prev && new)
 135                         change = '+';
 136                 else if (prev && !new)
 137                         change = '-';
 138                 else
 139                         change = ' ';
 140
 141                 if (prev || new) {
 142                         pr_debug(" %c%s\n", change, desc[i]);
 143
 144                         if (bit == 1) /* USB_PORT_STAT_CONNECTION */
 145                                 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS");
 146                 }
 147                 bit <<= 1;
 148                 i++;
 149         }
 150         pr_debug("\n");
 151 }
 152
 153 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
 154 {
 155         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 156         struct vhci *vhci = vhci_hcd->vhci;
 157         int             rhport = vdev->rhport;
 158         u32             status;
 159         unsigned long   flags;
 160
 161         usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
 162
 163         spin_lock_irqsave(&vhci->lock, flags);
 164
 165         status = vhci_hcd->port_status[rhport];
 166
 167         status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
 168
 169         switch (speed) {
 170         case USB_SPEED_HIGH:
 171                 status |= USB_PORT_STAT_HIGH_SPEED;
 172                 break;
 173         case USB_SPEED_LOW:
 174                 status |= USB_PORT_STAT_LOW_SPEED;
 175                 break;
 176         default:
 177                 break;
 178         }
 179
 180         vhci_hcd->port_status[rhport] = status;
 181
 182         spin_unlock_irqrestore(&vhci->lock, flags);
 183
 184         usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
 185 }
 186
 187 static void rh_port_disconnect(struct vhci_device *vdev)
 188 {
 189         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 190         struct vhci *vhci = vhci_hcd->vhci;
 191         int             rhport = vdev->rhport;
 192         u32             status;
 193         unsigned long   flags;
 194
 195         usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
 196
 197         spin_lock_irqsave(&vhci->lock, flags);
 198
 199         status = vhci_hcd->port_status[rhport];
 200
 201         status &= ~USB_PORT_STAT_CONNECTION;
 202         status |= (1 << USB_PORT_FEAT_C_CONNECTION);
 203
 204         vhci_hcd->port_status[rhport] = status;
 205
 206         spin_unlock_irqrestore(&vhci->lock, flags);
 207         usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
 208 }
 209
 210 #define PORT_C_MASK                             \
 211         ((USB_PORT_STAT_C_CONNECTION            \
 212           | USB_PORT_STAT_C_ENABLE              \
 213           | USB_PORT_STAT_C_SUSPEND             \
 214           | USB_PORT_STAT_C_OVERCURRENT         \
 215           | USB_PORT_STAT_C_RESET) << 16)
 216
 217 /*
 218  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 219  * Ports are 0-indexed from the HCD point of view,
 220  * and 1-indexed from the USB core pointer of view.
 221  *
 222  * @buf: a bitmap to show which port status has been changed.
 223  *  bit  0: reserved
 224  *  bit  1: the status of port 0 has been changed.
 225  *  bit  2: the status of port 1 has been changed.
 226  *  ...
 227  */
 228 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
 229 {
 230         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 231         struct vhci *vhci = vhci_hcd->vhci;
 232         int             retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
 233         int             rhport;
 234         int             changed = 0;
 235         unsigned long   flags;
 236
 237         memset(buf, 0, retval);
 238
 239         spin_lock_irqsave(&vhci->lock, flags);
 240         if (!HCD_HW_ACCESSIBLE(hcd)) {
 241                 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
 242                 goto done;
 243         }
 244
 245         /* check pseudo status register for each port */
 246         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
 247                 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) {
 248                         /* The status of a port has been changed, */
 249                         usbip_dbg_vhci_rh("port %d status changed\n", rhport);
 250
 251                         buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
 252                         changed = 1;
 253                 }
 254         }
 255
 256         if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
 257                 usb_hcd_resume_root_hub(hcd);
 258
 259 done:
 260         spin_unlock_irqrestore(&vhci->lock, flags);
 261         return changed ? retval : 0;
 262 }
 263
 264 /* usb 3.0 root hub device descriptor */
 265 static struct {
 266         struct usb_bos_descriptor bos;
 267         struct usb_ss_cap_descriptor ss_cap;
 268 } __packed usb3_bos_desc = {
 269
 270         .bos = {
 271                 .bLength                = USB_DT_BOS_SIZE,
 272                 .bDescriptorType        = USB_DT_BOS,
 273                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
 274                 .bNumDeviceCaps         = 1,
 275         },
 276         .ss_cap = {
 277                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
 278                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
 279                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
 280                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
 281                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
 282         },
 283 };
 284
 285 static inline void
 286 ss_hub_descriptor(struct usb_hub_descriptor *desc)
 287 {
 288         memset(desc, 0, sizeof *desc);
 289         desc->bDescriptorType = USB_DT_SS_HUB;
 290         desc->bDescLength = 12;
 291         desc->wHubCharacteristics = cpu_to_le16(
 292                 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
 293         desc->bNbrPorts = VHCI_HC_PORTS;
 294         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
 295         desc->u.ss.DeviceRemovable = 0xffff;
 296 }
 297
 298 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 299 {
 300         int width;
 301
 302         memset(desc, 0, sizeof(*desc));
 303         desc->bDescriptorType = USB_DT_HUB;
 304         desc->wHubCharacteristics = cpu_to_le16(
 305                 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
 306
 307         desc->bNbrPorts = VHCI_HC_PORTS;
 308         BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
 309         width = desc->bNbrPorts / 8 + 1;
 310         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
 311         memset(&desc->u.hs.DeviceRemovable[0], 0, width);
 312         memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
 313 }
 314
 315 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 316                             u16 wIndex, char *buf, u16 wLength)
 317 {
 318         struct vhci_hcd *vhci_hcd;
 319         struct vhci     *vhci;
 320         int             retval = 0;
 321         int             rhport = -1;
 322         unsigned long   flags;
 323         bool invalid_rhport = false;
 324
 325         u32 prev_port_status[VHCI_HC_PORTS];
 326
 327         if (!HCD_HW_ACCESSIBLE(hcd))
 328                 return -ETIMEDOUT;
 329
 330         /*
 331          * NOTE:
 332          * wIndex (bits 0-7) shows the port number and begins from 1?
 333          */
 334         wIndex = ((__u8)(wIndex & 0x00ff));
 335         usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
 336                           wIndex);
 337
 338         /*
 339          * wIndex can be 0 for some request types (typeReq). rhport is
 340          * in valid range when wIndex >= 1 and < VHCI_HC_PORTS.
 341          *
 342          * Reference port_status[] only with valid rhport when
 343          * invalid_rhport is false.
 344          */
 345         if (wIndex < 1 || wIndex > VHCI_HC_PORTS) {
 346                 invalid_rhport = true;
 347                 if (wIndex > VHCI_HC_PORTS)
 348                         pr_err("invalid port number %d\n", wIndex);
 349         } else
 350                 rhport = wIndex - 1;
 351
 352         vhci_hcd = hcd_to_vhci_hcd(hcd);
 353         vhci = vhci_hcd->vhci;
 354
 355         spin_lock_irqsave(&vhci->lock, flags);
 356
 357         /* store old status and compare now and old later */
 358         if (usbip_dbg_flag_vhci_rh) {
 359                 if (!invalid_rhport)
 360                         memcpy(prev_port_status, vhci_hcd->port_status,
 361                                 sizeof(prev_port_status));
 362         }
 363
 364         switch (typeReq) {
 365         case ClearHubFeature:
 366                 usbip_dbg_vhci_rh(" ClearHubFeature\n");
 367                 break;
 368         case ClearPortFeature:
 369                 if (invalid_rhport) {
 370                         pr_err("invalid port number %d\n", wIndex);
 371                         goto error;
 372                 }
 373                 switch (wValue) {
 374                 case USB_PORT_FEAT_SUSPEND:
 375                         if (hcd->speed == HCD_USB3) {
 376                                 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not "
 377                                        "supported for USB 3.0 roothub\n");
 378                                 goto error;
 379                         }
 380                         usbip_dbg_vhci_rh(
 381                                 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n");
 382                         if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
 383                                 /* 20msec signaling */
 384                                 vhci_hcd->resuming = 1;
 385                                 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 386                         }
 387                         break;
 388                 case USB_PORT_FEAT_POWER:
 389                         usbip_dbg_vhci_rh(
 390                                 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
 391                         if (hcd->speed == HCD_USB3)
 392                                 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER;
 393                         else
 394                                 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER;
 395                         break;
 396                 default:
 397                         usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
 398                                           wValue);
 399                         vhci_hcd->port_status[rhport] &= ~(1 << wValue);
 400                         break;
 401                 }
 402                 break;
 403         case GetHubDescriptor:
 404                 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
 405                 if (hcd->speed == HCD_USB3 &&
 406                                 (wLength < USB_DT_SS_HUB_SIZE ||
 407                                  wValue != (USB_DT_SS_HUB << 8))) {
 408                         pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n");
 409                         goto error;
 410                 }
 411                 if (hcd->speed == HCD_USB3)
 412                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
 413                 else
 414                         hub_descriptor((struct usb_hub_descriptor *) buf);
 415                 break;
 416         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 417                 if (hcd->speed != HCD_USB3)
 418                         goto error;
 419
 420                 if ((wValue >> 8) != USB_DT_BOS)
 421                         goto error;
 422
 423                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
 424                 retval = sizeof(usb3_bos_desc);
 425                 break;
 426         case GetHubStatus:
 427                 usbip_dbg_vhci_rh(" GetHubStatus\n");
 428                 *(__le32 *) buf = cpu_to_le32(0);
 429                 break;
 430         case GetPortStatus:
 431                 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
 432                 if (invalid_rhport) {
 433                         pr_err("invalid port number %d\n", wIndex);
 434                         retval = -EPIPE;
 435                         goto error;
 436                 }
 437
 438                 /* we do not care about resume. */
 439
 440                 /* whoever resets or resumes must GetPortStatus to
 441                  * complete it!!
 442                  */
 443                 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) {
 444                         vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND);
 445                         vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND);
 446                         vhci_hcd->resuming = 0;
 447                         vhci_hcd->re_timeout = 0;
 448                 }
 449
 450                 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
 451                     0 && time_after(jiffies, vhci_hcd->re_timeout)) {
 452                         vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET);
 453                         vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET);
 454                         vhci_hcd->re_timeout = 0;
 455
 456                         if (vhci_hcd->vdev[rhport].ud.status ==
 457                             VDEV_ST_NOTASSIGNED) {
 458                                 usbip_dbg_vhci_rh(
 459                                         " enable rhport %d (status %u)\n",
 460                                         rhport,
 461                                         vhci_hcd->vdev[rhport].ud.status);
 462                                 vhci_hcd->port_status[rhport] |=
 463                                         USB_PORT_STAT_ENABLE;
 464                         }
 465
 466                         if (hcd->speed < HCD_USB3) {
 467                                 switch (vhci_hcd->vdev[rhport].speed) {
 468                                 case USB_SPEED_HIGH:
 469                                         vhci_hcd->port_status[rhport] |=
 470                                               USB_PORT_STAT_HIGH_SPEED;
 471                                         break;
 472                                 case USB_SPEED_LOW:
 473                                         vhci_hcd->port_status[rhport] |=
 474                                                 USB_PORT_STAT_LOW_SPEED;
 475                                         break;
 476                                 default:
 477                                         pr_err("vhci_device speed not set\n");
 478                                         break;
 479                                 }
 480                         }
 481                 }
 482                 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]);
 483                 ((__le16 *) buf)[1] =
 484                         cpu_to_le16(vhci_hcd->port_status[rhport] >> 16);
 485
 486                 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
 487                                   ((u16 *)buf)[1]);
 488                 break;
 489         case SetHubFeature:
 490                 usbip_dbg_vhci_rh(" SetHubFeature\n");
 491                 retval = -EPIPE;
 492                 break;
 493         case SetPortFeature:
 494                 switch (wValue) {
 495                 case USB_PORT_FEAT_LINK_STATE:
 496                         usbip_dbg_vhci_rh(
 497                                 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n");
 498                         if (hcd->speed != HCD_USB3) {
 499                                 pr_err("USB_PORT_FEAT_LINK_STATE req not "
 500                                        "supported for USB 2.0 roothub\n");
 501                                 goto error;
 502                         }
 503                         /*
 504                          * Since this is dummy we don't have an actual link so
 505                          * there is nothing to do for the SET_LINK_STATE cmd
 506                          */
 507                         break;
 508                 case USB_PORT_FEAT_U1_TIMEOUT:
 509                         usbip_dbg_vhci_rh(
 510                                 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n");
 511                 case USB_PORT_FEAT_U2_TIMEOUT:
 512                         usbip_dbg_vhci_rh(
 513                                 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n");
 514                         /* TODO: add suspend/resume support! */
 515                         if (hcd->speed != HCD_USB3) {
 516                                 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not "
 517                                        "supported for USB 2.0 roothub\n");
 518                                 goto error;
 519                         }
 520                         break;
 521                 case USB_PORT_FEAT_SUSPEND:
 522                         usbip_dbg_vhci_rh(
 523                                 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
 524                         /* Applicable only for USB2.0 hub */
 525                         if (hcd->speed == HCD_USB3) {
 526                                 pr_err("USB_PORT_FEAT_SUSPEND req not "
 527                                        "supported for USB 3.0 roothub\n");
 528                                 goto error;
 529                         }
 530
 531                         if (invalid_rhport) {
 532                                 pr_err("invalid port number %d\n", wIndex);
 533                                 goto error;
 534                         }
 535
 536                         vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND;
 537                         break;
 538                 case USB_PORT_FEAT_POWER:
 539                         usbip_dbg_vhci_rh(
 540                                 " SetPortFeature: USB_PORT_FEAT_POWER\n");
 541                         if (invalid_rhport) {
 542                                 pr_err("invalid port number %d\n", wIndex);
 543                                 goto error;
 544                         }
 545                         if (hcd->speed == HCD_USB3)
 546                                 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER;
 547                         else
 548                                 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER;
 549                         break;
 550                 case USB_PORT_FEAT_BH_PORT_RESET:
 551                         usbip_dbg_vhci_rh(
 552                                 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n");
 553                         if (invalid_rhport) {
 554                                 pr_err("invalid port number %d\n", wIndex);
 555                                 goto error;
 556                         }
 557                         /* Applicable only for USB3.0 hub */
 558                         if (hcd->speed != HCD_USB3) {
 559                                 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not "
 560                                        "supported for USB 2.0 roothub\n");
 561                                 goto error;
 562                         }
 563                         /* FALLS THROUGH */
 564                 case USB_PORT_FEAT_RESET:
 565                         usbip_dbg_vhci_rh(
 566                                 " SetPortFeature: USB_PORT_FEAT_RESET\n");
 567                         if (invalid_rhport) {
 568                                 pr_err("invalid port number %d\n", wIndex);
 569                                 goto error;
 570                         }
 571                         /* if it's already enabled, disable */
 572                         if (hcd->speed == HCD_USB3) {
 573                                 vhci_hcd->port_status[rhport] = 0;
 574                                 vhci_hcd->port_status[rhport] =
 575                                         (USB_SS_PORT_STAT_POWER |
 576                                          USB_PORT_STAT_CONNECTION |
 577                                          USB_PORT_STAT_RESET);
 578                         } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 579                                 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE
 580                                         | USB_PORT_STAT_LOW_SPEED
 581                                         | USB_PORT_STAT_HIGH_SPEED);
 582                         }
 583
 584                         /* 50msec reset signaling */
 585                         vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
 586
 587                         /* FALLS THROUGH */
 588                 default:
 589                         usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 590                                           wValue);
 591                         if (invalid_rhport) {
 592                                 pr_err("invalid port number %d\n", wIndex);
 593                                 goto error;
 594                         }
 595                         if (hcd->speed == HCD_USB3) {
 596                                 if ((vhci_hcd->port_status[rhport] &
 597                                      USB_SS_PORT_STAT_POWER) != 0) {
 598                                         vhci_hcd->port_status[rhport] |= (1 << wValue);
 599                                 }
 600                         } else
 601                                 if ((vhci_hcd->port_status[rhport] &
 602                                      USB_PORT_STAT_POWER) != 0) {
 603                                         vhci_hcd->port_status[rhport] |= (1 << wValue);
 604                                 }
 605                 }
 606                 break;
 607         case GetPortErrorCount:
 608                 usbip_dbg_vhci_rh(" GetPortErrorCount\n");
 609                 if (hcd->speed != HCD_USB3) {
 610                         pr_err("GetPortErrorCount req not "
 611                                "supported for USB 2.0 roothub\n");
 612                         goto error;
 613                 }
 614                 /* We'll always return 0 since this is a dummy hub */
 615                 *(__le32 *) buf = cpu_to_le32(0);
 616                 break;
 617         case SetHubDepth:
 618                 usbip_dbg_vhci_rh(" SetHubDepth\n");
 619                 if (hcd->speed != HCD_USB3) {
 620                         pr_err("SetHubDepth req not supported for "
 621                                "USB 2.0 roothub\n");
 622                         goto error;
 623                 }
 624                 break;
 625         default:
 626                 pr_err("default hub control req: %04x v%04x i%04x l%d\n",
 627                         typeReq, wValue, wIndex, wLength);
 628 error:
 629                 /* "protocol stall" on error */
 630                 retval = -EPIPE;
 631         }
 632
 633         if (usbip_dbg_flag_vhci_rh) {
 634                 pr_debug("port %d\n", rhport);
 635                 /* Only dump valid port status */
 636                 if (!invalid_rhport) {
 637                         dump_port_status_diff(prev_port_status[rhport],
 638                                               vhci_hcd->port_status[rhport],
 639                                               hcd->speed == HCD_USB3);
 640                 }
 641         }
 642         usbip_dbg_vhci_rh(" bye\n");
 643
 644         spin_unlock_irqrestore(&vhci->lock, flags);
 645
 646         if (!invalid_rhport &&
 647             (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) {
 648                 usb_hcd_poll_rh_status(hcd);
 649         }
 650
 651         return retval;
 652 }
 653
 654 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
 655 {
 656         struct vhci_priv *priv;
 657         struct vhci_hcd *vhci_hcd;
 658         unsigned long flags;
 659
 660         if (!vdev) {
 661                 pr_err("could not get virtual device");
 662                 return;
 663         }
 664         vhci_hcd = vdev_to_vhci_hcd(vdev);
 665
 666         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 667         if (!priv) {
 668                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 669                 return;
 670         }
 671
 672         spin_lock_irqsave(&vdev->priv_lock, flags);
 673
 674         priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 675         if (priv->seqnum == 0xffff)
 676                 dev_info(&urb->dev->dev, "seqnum max\n");
 677
 678         priv->vdev = vdev;
 679         priv->urb = urb;
 680
 681         urb->hcpriv = (void *) priv;
 682
 683         list_add_tail(&priv->list, &vdev->priv_tx);
 684
 685         wake_up(&vdev->waitq_tx);
 686         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 687 }
 688
 689 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
 690 {
 691         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 692         struct vhci *vhci = vhci_hcd->vhci;
 693         struct device *dev = &urb->dev->dev;
 694         u8 portnum = urb->dev->portnum;
 695         int ret = 0;
 696         struct vhci_device *vdev;
 697         unsigned long flags;
 698
 699         if (portnum > VHCI_HC_PORTS) {
 700                 pr_err("invalid port number %d\n", portnum);
 701                 return -ENODEV;
 702         }
 703         vdev = &vhci_hcd->vdev[portnum-1];
 704
 705         /* patch to usb_sg_init() is in 2.5.60 */
 706         BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
 707
 708         spin_lock_irqsave(&vhci->lock, flags);
 709
 710         if (urb->status != -EINPROGRESS) {
 711                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 712                 spin_unlock_irqrestore(&vhci->lock, flags);
 713                 return urb->status;
 714         }
 715
 716         /* refuse enqueue for dead connection */
 717         spin_lock(&vdev->ud.lock);
 718         if (vdev->ud.status == VDEV_ST_NULL ||
 719             vdev->ud.status == VDEV_ST_ERROR) {
 720                 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
 721                 spin_unlock(&vdev->ud.lock);
 722                 spin_unlock_irqrestore(&vhci->lock, flags);
 723                 return -ENODEV;
 724         }
 725         spin_unlock(&vdev->ud.lock);
 726
 727         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 728         if (ret)
 729                 goto no_need_unlink;
 730
 731         /*
 732          * The enumeration process is as follows;
 733          *
 734          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 735          *     to get max packet length of default pipe
 736          *
 737          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 738          *
 739          */
 740         if (usb_pipedevice(urb->pipe) == 0) {
 741                 __u8 type = usb_pipetype(urb->pipe);
 742                 struct usb_ctrlrequest *ctrlreq =
 743                         (struct usb_ctrlrequest *) urb->setup_packet;
 744
 745                 if (type != PIPE_CONTROL || !ctrlreq) {
 746                         dev_err(dev, "invalid request to devnum 0\n");
 747                         ret = -EINVAL;
 748                         goto no_need_xmit;
 749                 }
 750
 751                 switch (ctrlreq->bRequest) {
 752                 case USB_REQ_SET_ADDRESS:
 753                         /* set_address may come when a device is reset */
 754                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 755                                  ctrlreq->wValue, vdev->rhport);
 756
 757                         usb_put_dev(vdev->udev);
 758                         vdev->udev = usb_get_dev(urb->dev);
 759
 760                         spin_lock(&vdev->ud.lock);
 761                         vdev->ud.status = VDEV_ST_USED;
 762                         spin_unlock(&vdev->ud.lock);
 763
 764                         if (urb->status == -EINPROGRESS) {
 765                                 /* This request is successfully completed. */
 766                                 /* If not -EINPROGRESS, possibly unlinked. */
 767                                 urb->status = 0;
 768                         }
 769
 770                         goto no_need_xmit;
 771
 772                 case USB_REQ_GET_DESCRIPTOR:
 773                         if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
 774                                 usbip_dbg_vhci_hc(
 775                                         "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
 776
 777                         usb_put_dev(vdev->udev);
 778                         vdev->udev = usb_get_dev(urb->dev);
 779                         goto out;
 780
 781                 default:
 782                         /* NOT REACHED */
 783                         dev_err(dev,
 784                                 "invalid request to devnum 0 bRequest %u, wValue %u\n",
 785                                 ctrlreq->bRequest,
 786                                 ctrlreq->wValue);
 787                         ret =  -EINVAL;
 788                         goto no_need_xmit;
 789                 }
 790
 791         }
 792
 793 out:
 794         vhci_tx_urb(urb, vdev);
 795         spin_unlock_irqrestore(&vhci->lock, flags);
 796
 797         return 0;
 798
 799 no_need_xmit:
 800         usb_hcd_unlink_urb_from_ep(hcd, urb);
 801 no_need_unlink:
 802         spin_unlock_irqrestore(&vhci->lock, flags);
 803         if (!ret)
 804                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 805         return ret;
 806 }
 807
 808 /*
 809  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 810  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 811  * back its urb. For the driver unlinking the urb, the content of the urb is
 812  * not important, but the calling to its completion handler is important; the
 813  * completion of unlinking is notified by the completion handler.
 814  *
 815  *
 816  * CLIENT SIDE
 817  *
 818  * - When vhci_hcd receives RET_SUBMIT,
 819  *
 820  *      - case 1a). the urb of the pdu is not unlinking.
 821  *              - normal case
 822  *              => just give back the urb
 823  *
 824  *      - case 1b). the urb of the pdu is unlinking.
 825  *              - usbip.ko will return a reply of the unlinking request.
 826  *              => give back the urb now and go to case 2b).
 827  *
 828  * - When vhci_hcd receives RET_UNLINK,
 829  *
 830  *      - case 2a). a submit request is still pending in vhci_hcd.
 831  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 832  *                completed there.
 833  *              => free a pending submit request
 834  *              => notify unlink completeness by giving back the urb
 835  *
 836  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 837  *              - urb was already given back to the core driver.
 838  *              => do not give back the urb
 839  *
 840  *
 841  * SERVER SIDE
 842  *
 843  * - When usbip receives CMD_UNLINK,
 844  *
 845  *      - case 3a). the urb of the unlink request is now in submission.
 846  *              => do usb_unlink_urb().
 847  *              => after the unlink is completed, send RET_UNLINK.
 848  *
 849  *      - case 3b). the urb of the unlink request is not in submission.
 850  *              - may be already completed or never be received
 851  *              => send RET_UNLINK
 852  *
 853  */
 854 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 855 {
 856         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 857         struct vhci *vhci = vhci_hcd->vhci;
 858         struct vhci_priv *priv;
 859         struct vhci_device *vdev;
 860         unsigned long flags;
 861
 862         spin_lock_irqsave(&vhci->lock, flags);
 863
 864         priv = urb->hcpriv;
 865         if (!priv) {
 866                 /* URB was never linked! or will be soon given back by
 867                  * vhci_rx. */
 868                 spin_unlock_irqrestore(&vhci->lock, flags);
 869                 return -EIDRM;
 870         }
 871
 872         {
 873                 int ret = 0;
 874
 875                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 876                 if (ret) {
 877                         spin_unlock_irqrestore(&vhci->lock, flags);
 878                         return ret;
 879                 }
 880         }
 881
 882          /* send unlink request here? */
 883         vdev = priv->vdev;
 884
 885         if (!vdev->ud.tcp_socket) {
 886                 /* tcp connection is closed */
 887                 spin_lock(&vdev->priv_lock);
 888
 889                 list_del(&priv->list);
 890                 kfree(priv);
 891                 urb->hcpriv = NULL;
 892
 893                 spin_unlock(&vdev->priv_lock);
 894
 895                 /*
 896                  * If tcp connection is alive, we have sent CMD_UNLINK.
 897                  * vhci_rx will receive RET_UNLINK and give back the URB.
 898                  * Otherwise, we give back it here.
 899                  */
 900                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 901
 902                 spin_unlock_irqrestore(&vhci->lock, flags);
 903                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 904                 spin_lock_irqsave(&vhci->lock, flags);
 905
 906         } else {
 907                 /* tcp connection is alive */
 908                 struct vhci_unlink *unlink;
 909
 910                 spin_lock(&vdev->priv_lock);
 911
 912                 /* setup CMD_UNLINK pdu */
 913                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 914                 if (!unlink) {
 915                         spin_unlock(&vdev->priv_lock);
 916                         spin_unlock_irqrestore(&vhci->lock, flags);
 917                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 918                         return -ENOMEM;
 919                 }
 920
 921                 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 922                 if (unlink->seqnum == 0xffff)
 923                         pr_info("seqnum max\n");
 924
 925                 unlink->unlink_seqnum = priv->seqnum;
 926
 927                 /* send cmd_unlink and try to cancel the pending URB in the
 928                  * peer */
 929                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 930                 wake_up(&vdev->waitq_tx);
 931
 932                 spin_unlock(&vdev->priv_lock);
 933         }
 934
 935         spin_unlock_irqrestore(&vhci->lock, flags);
 936
 937         usbip_dbg_vhci_hc("leave\n");
 938         return 0;
 939 }
 940
 941 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 942 {
 943         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 944         struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
 945         struct vhci *vhci = vhci_hcd->vhci;
 946         struct vhci_unlink *unlink, *tmp;
 947         unsigned long flags;
 948
 949         spin_lock_irqsave(&vhci->lock, flags);
 950         spin_lock(&vdev->priv_lock);
 951
 952         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 953                 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 954                 list_del(&unlink->list);
 955                 kfree(unlink);
 956         }
 957
 958         while (!list_empty(&vdev->unlink_rx)) {
 959                 struct urb *urb;
 960
 961                 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
 962                         list);
 963
 964                 /* give back URB of unanswered unlink request */
 965                 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 966
 967                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 968                 if (!urb) {
 969                         pr_info("the urb (seqnum %lu) was already given back\n",
 970                                 unlink->unlink_seqnum);
 971                         list_del(&unlink->list);
 972                         kfree(unlink);
 973                         continue;
 974                 }
 975
 976                 urb->status = -ENODEV;
 977
 978                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 979
 980                 list_del(&unlink->list);
 981
 982                 spin_unlock(&vdev->priv_lock);
 983                 spin_unlock_irqrestore(&vhci->lock, flags);
 984
 985                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 986
 987                 spin_lock_irqsave(&vhci->lock, flags);
 988                 spin_lock(&vdev->priv_lock);
 989
 990                 kfree(unlink);
 991         }
 992
 993         spin_unlock(&vdev->priv_lock);
 994         spin_unlock_irqrestore(&vhci->lock, flags);
 995 }
 996
 997 /*
 998  * The important thing is that only one context begins cleanup.
 999  * This is why error handling and cleanup become simple.
1000  * We do not want to consider race condition as possible.
1001  */
1002 static void vhci_shutdown_connection(struct usbip_device *ud)
1003 {
1004         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1005
1006         /* need this? see stub_dev.c */
1007         if (ud->tcp_socket) {
1008                 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
1009                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
1010         }
1011
1012         /* kill threads related to this sdev */
1013         if (vdev->ud.tcp_rx) {
1014                 kthread_stop_put(vdev->ud.tcp_rx);
1015                 vdev->ud.tcp_rx = NULL;
1016         }
1017         if (vdev->ud.tcp_tx) {
1018                 kthread_stop_put(vdev->ud.tcp_tx);
1019                 vdev->ud.tcp_tx = NULL;
1020         }
1021         pr_info("stop threads\n");
1022
1023         /* active connection is closed */
1024         if (vdev->ud.tcp_socket) {
1025                 sockfd_put(vdev->ud.tcp_socket);
1026                 vdev->ud.tcp_socket = NULL;
1027                 vdev->ud.sockfd = -1;
1028         }
1029         pr_info("release socket\n");
1030
1031         vhci_device_unlink_cleanup(vdev);
1032
1033         /*
1034          * rh_port_disconnect() is a trigger of ...
1035          *   usb_disable_device():
1036          *      disable all the endpoints for a USB device.
1037          *   usb_disable_endpoint():
1038          *      disable endpoints. pending urbs are unlinked(dequeued).
1039          *
1040          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1041          * detached device should release used urbs in a cleanup function (i.e.
1042          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1043          * pushed urbs and their private data in this function.
1044          *
1045          * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1046          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1047          * gives back pushed urbs and frees their private data by request of
1048          * the cleanup function of a USB driver. When unlinking a urb with an
1049          * active connection, vhci_dequeue() does not give back the urb which
1050          * is actually given back by vhci_rx after receiving its return pdu.
1051          *
1052          */
1053         rh_port_disconnect(vdev);
1054
1055         pr_info("disconnect device\n");
1056 }
1057
1058 static void vhci_device_reset(struct usbip_device *ud)
1059 {
1060         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1061         unsigned long flags;
1062
1063         spin_lock_irqsave(&ud->lock, flags);
1064
1065         vdev->speed  = 0;
1066         vdev->devid  = 0;
1067
1068         usb_put_dev(vdev->udev);
1069         vdev->udev = NULL;
1070
1071         if (ud->tcp_socket) {
1072                 sockfd_put(ud->tcp_socket);
1073                 ud->tcp_socket = NULL;
1074                 ud->sockfd = -1;
1075         }
1076         ud->status = VDEV_ST_NULL;
1077
1078         spin_unlock_irqrestore(&ud->lock, flags);
1079 }
1080
1081 static void vhci_device_unusable(struct usbip_device *ud)
1082 {
1083         unsigned long flags;
1084
1085         spin_lock_irqsave(&ud->lock, flags);
1086         ud->status = VDEV_ST_ERROR;
1087         spin_unlock_irqrestore(&ud->lock, flags);
1088 }
1089
1090 static void vhci_device_init(struct vhci_device *vdev)
1091 {
1092         memset(vdev, 0, sizeof(struct vhci_device));
1093
1094         vdev->ud.side   = USBIP_VHCI;
1095         vdev->ud.status = VDEV_ST_NULL;
1096         spin_lock_init(&vdev->ud.lock);
1097
1098         INIT_LIST_HEAD(&vdev->priv_rx);
1099         INIT_LIST_HEAD(&vdev->priv_tx);
1100         INIT_LIST_HEAD(&vdev->unlink_tx);
1101         INIT_LIST_HEAD(&vdev->unlink_rx);
1102         spin_lock_init(&vdev->priv_lock);
1103
1104         init_waitqueue_head(&vdev->waitq_tx);
1105
1106         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1107         vdev->ud.eh_ops.reset = vhci_device_reset;
1108         vdev->ud.eh_ops.unusable = vhci_device_unusable;
1109
1110         usbip_start_eh(&vdev->ud);
1111 }
1112
1113 static int hcd_name_to_id(const char *name)
1114 {
1115         char *c;
1116         long val;
1117         int ret;
1118
1119         c = strchr(name, '.');
1120         if (c == NULL)
1121                 return 0;
1122
1123         ret = kstrtol(c+1, 10, &val);
1124         if (ret < 0)
1125                 return ret;
1126
1127         return val;
1128 }
1129
1130 static int vhci_setup(struct usb_hcd *hcd)
1131 {
1132         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1133         if (usb_hcd_is_primary_hcd(hcd)) {
1134                 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1135                 vhci->vhci_hcd_hs->vhci = vhci;
1136                 /*
1137                  * Mark the first roothub as being USB 2.0.
1138                  * The USB 3.0 roothub will be registered later by
1139                  * vhci_hcd_probe()
1140                  */
1141                 hcd->speed = HCD_USB2;
1142                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1143         } else {
1144                 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1145                 vhci->vhci_hcd_ss->vhci = vhci;
1146                 hcd->speed = HCD_USB3;
1147                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1148         }
1149         return 0;
1150 }
1151
1152 static int vhci_start(struct usb_hcd *hcd)
1153 {
1154         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1155         int id, rhport;
1156         int err;
1157
1158         usbip_dbg_vhci_hc("enter vhci_start\n");
1159
1160         if (usb_hcd_is_primary_hcd(hcd))
1161                 spin_lock_init(&vhci_hcd->vhci->lock);
1162
1163         /* initialize private data of usb_hcd */
1164
1165         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1166                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1167
1168                 vhci_device_init(vdev);
1169                 vdev->rhport = rhport;
1170         }
1171
1172         atomic_set(&vhci_hcd->seqnum, 0);
1173
1174         hcd->power_budget = 0; /* no limit */
1175         hcd->uses_new_polling = 1;
1176
1177 #ifdef CONFIG_USB_OTG
1178         hcd->self.otg_port = 1;
1179 #endif
1180
1181         id = hcd_name_to_id(hcd_name(hcd));
1182         if (id < 0) {
1183                 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1184                 return -EINVAL;
1185         }
1186
1187         /* vhci_hcd is now ready to be controlled through sysfs */
1188         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1189                 err = vhci_init_attr_group();
1190                 if (err) {
1191                         pr_err("init attr group\n");
1192                         return err;
1193                 }
1194                 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1195                 if (err) {
1196                         pr_err("create sysfs files\n");
1197                         vhci_finish_attr_group();
1198                         return err;
1199                 }
1200                 pr_info("created sysfs %s\n", hcd_name(hcd));
1201         }
1202
1203         return 0;
1204 }
1205
1206 static void vhci_stop(struct usb_hcd *hcd)
1207 {
1208         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1209         int id, rhport;
1210
1211         usbip_dbg_vhci_hc("stop VHCI controller\n");
1212
1213         /* 1. remove the userland interface of vhci_hcd */
1214         id = hcd_name_to_id(hcd_name(hcd));
1215         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1216                 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1217                 vhci_finish_attr_group();
1218         }
1219
1220         /* 2. shutdown all the ports of vhci_hcd */
1221         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1222                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1223
1224                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1225                 usbip_stop_eh(&vdev->ud);
1226         }
1227 }
1228
1229 static int vhci_get_frame_number(struct usb_hcd *hcd)
1230 {
1231         dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1232         return 0;
1233 }
1234
1235 #ifdef CONFIG_PM
1236
1237 /* FIXME: suspend/resume */
1238 static int vhci_bus_suspend(struct usb_hcd *hcd)
1239 {
1240         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1241         unsigned long flags;
1242
1243         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1244
1245         spin_lock_irqsave(&vhci->lock, flags);
1246         hcd->state = HC_STATE_SUSPENDED;
1247         spin_unlock_irqrestore(&vhci->lock, flags);
1248
1249         return 0;
1250 }
1251
1252 static int vhci_bus_resume(struct usb_hcd *hcd)
1253 {
1254         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1255         int rc = 0;
1256         unsigned long flags;
1257
1258         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1259
1260         spin_lock_irqsave(&vhci->lock, flags);
1261         if (!HCD_HW_ACCESSIBLE(hcd))
1262                 rc = -ESHUTDOWN;
1263         else
1264                 hcd->state = HC_STATE_RUNNING;
1265         spin_unlock_irqrestore(&vhci->lock, flags);
1266
1267         return rc;
1268 }
1269
1270 #else
1271
1272 #define vhci_bus_suspend      NULL
1273 #define vhci_bus_resume       NULL
1274 #endif
1275
1276 /* Change a group of bulk endpoints to support multiple stream IDs */
1277 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1278         struct usb_host_endpoint **eps, unsigned int num_eps,
1279         unsigned int num_streams, gfp_t mem_flags)
1280 {
1281         dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1282         return 0;
1283 }
1284
1285 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1286 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1287         struct usb_host_endpoint **eps, unsigned int num_eps,
1288         gfp_t mem_flags)
1289 {
1290         dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1291         return 0;
1292 }
1293
1294 static const struct hc_driver vhci_hc_driver = {
1295         .description    = driver_name,
1296         .product_desc   = driver_desc,
1297         .hcd_priv_size  = sizeof(struct vhci_hcd),
1298
1299         .flags          = HCD_USB3 | HCD_SHARED,
1300
1301         .reset          = vhci_setup,
1302         .start          = vhci_start,
1303         .stop           = vhci_stop,
1304
1305         .urb_enqueue    = vhci_urb_enqueue,
1306         .urb_dequeue    = vhci_urb_dequeue,
1307
1308         .get_frame_number = vhci_get_frame_number,
1309
1310         .hub_status_data = vhci_hub_status,
1311         .hub_control    = vhci_hub_control,
1312         .bus_suspend    = vhci_bus_suspend,
1313         .bus_resume     = vhci_bus_resume,
1314
1315         .alloc_streams  = vhci_alloc_streams,
1316         .free_streams   = vhci_free_streams,
1317 };
1318
1319 static int vhci_hcd_probe(struct platform_device *pdev)
1320 {
1321         struct vhci             *vhci = *((void **)dev_get_platdata(&pdev->dev));
1322         struct usb_hcd          *hcd_hs;
1323         struct usb_hcd          *hcd_ss;
1324         int                     ret;
1325
1326         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1327
1328         /*
1329          * Allocate and initialize hcd.
1330          * Our private data is also allocated automatically.
1331          */
1332         hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1333         if (!hcd_hs) {
1334                 pr_err("create primary hcd failed\n");
1335                 return -ENOMEM;
1336         }
1337         hcd_hs->has_tt = 1;
1338
1339         /*
1340          * Finish generic HCD structure initialization and register.
1341          * Call the driver's reset() and start() routines.
1342          */
1343         ret = usb_add_hcd(hcd_hs, 0, 0);
1344         if (ret != 0) {
1345                 pr_err("usb_add_hcd hs failed %d\n", ret);
1346                 goto put_usb2_hcd;
1347         }
1348
1349         hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1350                                        dev_name(&pdev->dev), hcd_hs);
1351         if (!hcd_ss) {
1352                 ret = -ENOMEM;
1353                 pr_err("create shared hcd failed\n");
1354                 goto remove_usb2_hcd;
1355         }
1356
1357         ret = usb_add_hcd(hcd_ss, 0, 0);
1358         if (ret) {
1359                 pr_err("usb_add_hcd ss failed %d\n", ret);
1360                 goto put_usb3_hcd;
1361         }
1362
1363         usbip_dbg_vhci_hc("bye\n");
1364         return 0;
1365
1366 put_usb3_hcd:
1367         usb_put_hcd(hcd_ss);
1368 remove_usb2_hcd:
1369         usb_remove_hcd(hcd_hs);
1370 put_usb2_hcd:
1371         usb_put_hcd(hcd_hs);
1372         vhci->vhci_hcd_hs = NULL;
1373         vhci->vhci_hcd_ss = NULL;
1374         return ret;
1375 }
1376
1377 static int vhci_hcd_remove(struct platform_device *pdev)
1378 {
1379         struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1380
1381         /*
1382          * Disconnects the root hub,
1383          * then reverses the effects of usb_add_hcd(),
1384          * invoking the HCD's stop() methods.
1385          */
1386         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1387         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1388
1389         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1390         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1391
1392         vhci->vhci_hcd_hs = NULL;
1393         vhci->vhci_hcd_ss = NULL;
1394
1395         return 0;
1396 }
1397
1398 #ifdef CONFIG_PM
1399
1400 /* what should happen for USB/IP under suspend/resume? */
1401 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1402 {
1403         struct usb_hcd *hcd;
1404         struct vhci *vhci;
1405         int rhport;
1406         int connected = 0;
1407         int ret = 0;
1408         unsigned long flags;
1409
1410         dev_dbg(&pdev->dev, "%s\n", __func__);
1411
1412         hcd = platform_get_drvdata(pdev);
1413         if (!hcd)
1414                 return 0;
1415
1416         vhci = *((void **)dev_get_platdata(hcd->self.controller));
1417
1418         spin_lock_irqsave(&vhci->lock, flags);
1419
1420         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1421                 if (vhci->vhci_hcd_hs->port_status[rhport] &
1422                     USB_PORT_STAT_CONNECTION)
1423                         connected += 1;
1424
1425                 if (vhci->vhci_hcd_ss->port_status[rhport] &
1426                     USB_PORT_STAT_CONNECTION)
1427                         connected += 1;
1428         }
1429
1430         spin_unlock_irqrestore(&vhci->lock, flags);
1431
1432         if (connected > 0) {
1433                 dev_info(&pdev->dev,
1434                          "We have %d active connection%s. Do not suspend.\n",
1435                          connected, (connected == 1 ? "" : "s"));
1436                 ret =  -EBUSY;
1437         } else {
1438                 dev_info(&pdev->dev, "suspend vhci_hcd");
1439                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1440         }
1441
1442         return ret;
1443 }
1444
1445 static int vhci_hcd_resume(struct platform_device *pdev)
1446 {
1447         struct usb_hcd *hcd;
1448
1449         dev_dbg(&pdev->dev, "%s\n", __func__);
1450
1451         hcd = platform_get_drvdata(pdev);
1452         if (!hcd)
1453                 return 0;
1454         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1455         usb_hcd_poll_rh_status(hcd);
1456
1457         return 0;
1458 }
1459
1460 #else
1461
1462 #define vhci_hcd_suspend        NULL
1463 #define vhci_hcd_resume         NULL
1464
1465 #endif
1466
1467 static struct platform_driver vhci_driver = {
1468         .probe  = vhci_hcd_probe,
1469         .remove = vhci_hcd_remove,
1470         .suspend = vhci_hcd_suspend,
1471         .resume = vhci_hcd_resume,
1472         .driver = {
1473                 .name = driver_name,
1474         },
1475 };
1476
1477 static void del_platform_devices(void)
1478 {
1479         struct platform_device *pdev;
1480         int i;
1481
1482         for (i = 0; i < vhci_num_controllers; i++) {
1483                 pdev = vhcis[i].pdev;
1484                 if (pdev != NULL)
1485                         platform_device_unregister(pdev);
1486                 vhcis[i].pdev = NULL;
1487         }
1488         sysfs_remove_link(&platform_bus.kobj, driver_name);
1489 }
1490
1491 static int __init vhci_hcd_init(void)
1492 {
1493         int i, ret;
1494
1495         if (usb_disabled())
1496                 return -ENODEV;
1497
1498         if (vhci_num_controllers < 1)
1499                 vhci_num_controllers = 1;
1500
1501         vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1502         if (vhcis == NULL)
1503                 return -ENOMEM;
1504
1505         for (i = 0; i < vhci_num_controllers; i++) {
1506                 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1507                 if (!vhcis[i].pdev) {
1508                         i--;
1509                         while (i >= 0)
1510                                 platform_device_put(vhcis[i--].pdev);
1511                         ret = -ENOMEM;
1512                         goto err_device_alloc;
1513                 }
1514         }
1515         for (i = 0; i < vhci_num_controllers; i++) {
1516                 void *vhci = &vhcis[i];
1517                 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1518                 if (ret)
1519                         goto err_driver_register;
1520         }
1521
1522         ret = platform_driver_register(&vhci_driver);
1523         if (ret)
1524                 goto err_driver_register;
1525
1526         for (i = 0; i < vhci_num_controllers; i++) {
1527                 ret = platform_device_add(vhcis[i].pdev);
1528                 if (ret < 0) {
1529                         i--;
1530                         while (i >= 0)
1531                                 platform_device_del(vhcis[i--].pdev);
1532                         goto err_add_hcd;
1533                 }
1534         }
1535
1536         return ret;
1537
1538 err_add_hcd:
1539         platform_driver_unregister(&vhci_driver);
1540 err_driver_register:
1541         for (i = 0; i < vhci_num_controllers; i++)
1542                 platform_device_put(vhcis[i].pdev);
1543 err_device_alloc:
1544         kfree(vhcis);
1545         return ret;
1546 }
1547
1548 static void __exit vhci_hcd_exit(void)
1549 {
1550         del_platform_devices();
1551         platform_driver_unregister(&vhci_driver);
1552         kfree(vhcis);
1553 }
1554
1555 module_init(vhci_hcd_init);
1556 module_exit(vhci_hcd_exit);
1557
1558 MODULE_AUTHOR(DRIVER_AUTHOR);
1559 MODULE_DESCRIPTION(DRIVER_DESC);
1560 MODULE_LICENSE("GPL");