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                         fallthrough;
 512                 case USB_PORT_FEAT_U2_TIMEOUT:
 513                         usbip_dbg_vhci_rh(
 514                                 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n");
 515                         /* TODO: add suspend/resume support! */
 516                         if (hcd->speed != HCD_USB3) {
 517                                 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not "
 518                                        "supported for USB 2.0 roothub\n");
 519                                 goto error;
 520                         }
 521                         break;
 522                 case USB_PORT_FEAT_SUSPEND:
 523                         usbip_dbg_vhci_rh(
 524                                 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
 525                         /* Applicable only for USB2.0 hub */
 526                         if (hcd->speed == HCD_USB3) {
 527                                 pr_err("USB_PORT_FEAT_SUSPEND req not "
 528                                        "supported for USB 3.0 roothub\n");
 529                                 goto error;
 530                         }
 531
 532                         if (invalid_rhport) {
 533                                 pr_err("invalid port number %d\n", wIndex);
 534                                 goto error;
 535                         }
 536
 537                         vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND;
 538                         break;
 539                 case USB_PORT_FEAT_POWER:
 540                         usbip_dbg_vhci_rh(
 541                                 " SetPortFeature: USB_PORT_FEAT_POWER\n");
 542                         if (invalid_rhport) {
 543                                 pr_err("invalid port number %d\n", wIndex);
 544                                 goto error;
 545                         }
 546                         if (hcd->speed == HCD_USB3)
 547                                 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER;
 548                         else
 549                                 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER;
 550                         break;
 551                 case USB_PORT_FEAT_BH_PORT_RESET:
 552                         usbip_dbg_vhci_rh(
 553                                 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n");
 554                         if (invalid_rhport) {
 555                                 pr_err("invalid port number %d\n", wIndex);
 556                                 goto error;
 557                         }
 558                         /* Applicable only for USB3.0 hub */
 559                         if (hcd->speed != HCD_USB3) {
 560                                 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not "
 561                                        "supported for USB 2.0 roothub\n");
 562                                 goto error;
 563                         }
 564                         fallthrough;
 565                 case USB_PORT_FEAT_RESET:
 566                         usbip_dbg_vhci_rh(
 567                                 " SetPortFeature: USB_PORT_FEAT_RESET\n");
 568                         if (invalid_rhport) {
 569                                 pr_err("invalid port number %d\n", wIndex);
 570                                 goto error;
 571                         }
 572                         /* if it's already enabled, disable */
 573                         if (hcd->speed == HCD_USB3) {
 574                                 vhci_hcd->port_status[rhport] = 0;
 575                                 vhci_hcd->port_status[rhport] =
 576                                         (USB_SS_PORT_STAT_POWER |
 577                                          USB_PORT_STAT_CONNECTION |
 578                                          USB_PORT_STAT_RESET);
 579                         } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 580                                 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE
 581                                         | USB_PORT_STAT_LOW_SPEED
 582                                         | USB_PORT_STAT_HIGH_SPEED);
 583                         }
 584
 585                         /* 50msec reset signaling */
 586                         vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
 587                         fallthrough;
 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 = vdev_to_vhci_hcd(vdev);
 658         unsigned long flags;
 659
 660         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 661         if (!priv) {
 662                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 663                 return;
 664         }
 665
 666         spin_lock_irqsave(&vdev->priv_lock, flags);
 667
 668         priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 669         if (priv->seqnum == 0xffff)
 670                 dev_info(&urb->dev->dev, "seqnum max\n");
 671
 672         priv->vdev = vdev;
 673         priv->urb = urb;
 674
 675         urb->hcpriv = (void *) priv;
 676
 677         list_add_tail(&priv->list, &vdev->priv_tx);
 678
 679         wake_up(&vdev->waitq_tx);
 680         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 681 }
 682
 683 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
 684 {
 685         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 686         struct vhci *vhci = vhci_hcd->vhci;
 687         struct device *dev = &urb->dev->dev;
 688         u8 portnum = urb->dev->portnum;
 689         int ret = 0;
 690         struct vhci_device *vdev;
 691         unsigned long flags;
 692
 693         if (portnum > VHCI_HC_PORTS) {
 694                 pr_err("invalid port number %d\n", portnum);
 695                 return -ENODEV;
 696         }
 697         vdev = &vhci_hcd->vdev[portnum-1];
 698
 699         if (!urb->transfer_buffer && !urb->num_sgs &&
 700              urb->transfer_buffer_length) {
 701                 dev_dbg(dev, "Null URB transfer buffer\n");
 702                 return -EINVAL;
 703         }
 704
 705         spin_lock_irqsave(&vhci->lock, flags);
 706
 707         if (urb->status != -EINPROGRESS) {
 708                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 709                 spin_unlock_irqrestore(&vhci->lock, flags);
 710                 return urb->status;
 711         }
 712
 713         /* refuse enqueue for dead connection */
 714         spin_lock(&vdev->ud.lock);
 715         if (vdev->ud.status == VDEV_ST_NULL ||
 716             vdev->ud.status == VDEV_ST_ERROR) {
 717                 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
 718                 spin_unlock(&vdev->ud.lock);
 719                 spin_unlock_irqrestore(&vhci->lock, flags);
 720                 return -ENODEV;
 721         }
 722         spin_unlock(&vdev->ud.lock);
 723
 724         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 725         if (ret)
 726                 goto no_need_unlink;
 727
 728         /*
 729          * The enumeration process is as follows;
 730          *
 731          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 732          *     to get max packet length of default pipe
 733          *
 734          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 735          *
 736          */
 737         if (usb_pipedevice(urb->pipe) == 0) {
 738                 __u8 type = usb_pipetype(urb->pipe);
 739                 struct usb_ctrlrequest *ctrlreq =
 740                         (struct usb_ctrlrequest *) urb->setup_packet;
 741
 742                 if (type != PIPE_CONTROL || !ctrlreq) {
 743                         dev_err(dev, "invalid request to devnum 0\n");
 744                         ret = -EINVAL;
 745                         goto no_need_xmit;
 746                 }
 747
 748                 switch (ctrlreq->bRequest) {
 749                 case USB_REQ_SET_ADDRESS:
 750                         /* set_address may come when a device is reset */
 751                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 752                                  ctrlreq->wValue, vdev->rhport);
 753
 754                         usb_put_dev(vdev->udev);
 755                         vdev->udev = usb_get_dev(urb->dev);
 756
 757                         spin_lock(&vdev->ud.lock);
 758                         vdev->ud.status = VDEV_ST_USED;
 759                         spin_unlock(&vdev->ud.lock);
 760
 761                         if (urb->status == -EINPROGRESS) {
 762                                 /* This request is successfully completed. */
 763                                 /* If not -EINPROGRESS, possibly unlinked. */
 764                                 urb->status = 0;
 765                         }
 766
 767                         goto no_need_xmit;
 768
 769                 case USB_REQ_GET_DESCRIPTOR:
 770                         if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
 771                                 usbip_dbg_vhci_hc(
 772                                         "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
 773
 774                         usb_put_dev(vdev->udev);
 775                         vdev->udev = usb_get_dev(urb->dev);
 776                         goto out;
 777
 778                 default:
 779                         /* NOT REACHED */
 780                         dev_err(dev,
 781                                 "invalid request to devnum 0 bRequest %u, wValue %u\n",
 782                                 ctrlreq->bRequest,
 783                                 ctrlreq->wValue);
 784                         ret =  -EINVAL;
 785                         goto no_need_xmit;
 786                 }
 787
 788         }
 789
 790 out:
 791         vhci_tx_urb(urb, vdev);
 792         spin_unlock_irqrestore(&vhci->lock, flags);
 793
 794         return 0;
 795
 796 no_need_xmit:
 797         usb_hcd_unlink_urb_from_ep(hcd, urb);
 798 no_need_unlink:
 799         spin_unlock_irqrestore(&vhci->lock, flags);
 800         if (!ret)
 801                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 802         return ret;
 803 }
 804
 805 /*
 806  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 807  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 808  * back its urb. For the driver unlinking the urb, the content of the urb is
 809  * not important, but the calling to its completion handler is important; the
 810  * completion of unlinking is notified by the completion handler.
 811  *
 812  *
 813  * CLIENT SIDE
 814  *
 815  * - When vhci_hcd receives RET_SUBMIT,
 816  *
 817  *      - case 1a). the urb of the pdu is not unlinking.
 818  *              - normal case
 819  *              => just give back the urb
 820  *
 821  *      - case 1b). the urb of the pdu is unlinking.
 822  *              - usbip.ko will return a reply of the unlinking request.
 823  *              => give back the urb now and go to case 2b).
 824  *
 825  * - When vhci_hcd receives RET_UNLINK,
 826  *
 827  *      - case 2a). a submit request is still pending in vhci_hcd.
 828  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 829  *                completed there.
 830  *              => free a pending submit request
 831  *              => notify unlink completeness by giving back the urb
 832  *
 833  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 834  *              - urb was already given back to the core driver.
 835  *              => do not give back the urb
 836  *
 837  *
 838  * SERVER SIDE
 839  *
 840  * - When usbip receives CMD_UNLINK,
 841  *
 842  *      - case 3a). the urb of the unlink request is now in submission.
 843  *              => do usb_unlink_urb().
 844  *              => after the unlink is completed, send RET_UNLINK.
 845  *
 846  *      - case 3b). the urb of the unlink request is not in submission.
 847  *              - may be already completed or never be received
 848  *              => send RET_UNLINK
 849  *
 850  */
 851 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 852 {
 853         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 854         struct vhci *vhci = vhci_hcd->vhci;
 855         struct vhci_priv *priv;
 856         struct vhci_device *vdev;
 857         unsigned long flags;
 858
 859         spin_lock_irqsave(&vhci->lock, flags);
 860
 861         priv = urb->hcpriv;
 862         if (!priv) {
 863                 /* URB was never linked! or will be soon given back by
 864                  * vhci_rx. */
 865                 spin_unlock_irqrestore(&vhci->lock, flags);
 866                 return -EIDRM;
 867         }
 868
 869         {
 870                 int ret = 0;
 871
 872                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 873                 if (ret) {
 874                         spin_unlock_irqrestore(&vhci->lock, flags);
 875                         return ret;
 876                 }
 877         }
 878
 879          /* send unlink request here? */
 880         vdev = priv->vdev;
 881
 882         if (!vdev->ud.tcp_socket) {
 883                 /* tcp connection is closed */
 884                 spin_lock(&vdev->priv_lock);
 885
 886                 list_del(&priv->list);
 887                 kfree(priv);
 888                 urb->hcpriv = NULL;
 889
 890                 spin_unlock(&vdev->priv_lock);
 891
 892                 /*
 893                  * If tcp connection is alive, we have sent CMD_UNLINK.
 894                  * vhci_rx will receive RET_UNLINK and give back the URB.
 895                  * Otherwise, we give back it here.
 896                  */
 897                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 898
 899                 spin_unlock_irqrestore(&vhci->lock, flags);
 900                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 901                 spin_lock_irqsave(&vhci->lock, flags);
 902
 903         } else {
 904                 /* tcp connection is alive */
 905                 struct vhci_unlink *unlink;
 906
 907                 spin_lock(&vdev->priv_lock);
 908
 909                 /* setup CMD_UNLINK pdu */
 910                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 911                 if (!unlink) {
 912                         spin_unlock(&vdev->priv_lock);
 913                         spin_unlock_irqrestore(&vhci->lock, flags);
 914                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 915                         return -ENOMEM;
 916                 }
 917
 918                 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 919                 if (unlink->seqnum == 0xffff)
 920                         pr_info("seqnum max\n");
 921
 922                 unlink->unlink_seqnum = priv->seqnum;
 923
 924                 /* send cmd_unlink and try to cancel the pending URB in the
 925                  * peer */
 926                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 927                 wake_up(&vdev->waitq_tx);
 928
 929                 spin_unlock(&vdev->priv_lock);
 930         }
 931
 932         spin_unlock_irqrestore(&vhci->lock, flags);
 933
 934         usbip_dbg_vhci_hc("leave\n");
 935         return 0;
 936 }
 937
 938 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 939 {
 940         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 941         struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
 942         struct vhci *vhci = vhci_hcd->vhci;
 943         struct vhci_unlink *unlink, *tmp;
 944         unsigned long flags;
 945
 946         spin_lock_irqsave(&vhci->lock, flags);
 947         spin_lock(&vdev->priv_lock);
 948
 949         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 950                 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 951                 list_del(&unlink->list);
 952                 kfree(unlink);
 953         }
 954
 955         while (!list_empty(&vdev->unlink_rx)) {
 956                 struct urb *urb;
 957
 958                 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
 959                         list);
 960
 961                 /* give back URB of unanswered unlink request */
 962                 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 963
 964                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 965                 if (!urb) {
 966                         pr_info("the urb (seqnum %lu) was already given back\n",
 967                                 unlink->unlink_seqnum);
 968                         list_del(&unlink->list);
 969                         kfree(unlink);
 970                         continue;
 971                 }
 972
 973                 urb->status = -ENODEV;
 974
 975                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 976
 977                 list_del(&unlink->list);
 978
 979                 spin_unlock(&vdev->priv_lock);
 980                 spin_unlock_irqrestore(&vhci->lock, flags);
 981
 982                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 983
 984                 spin_lock_irqsave(&vhci->lock, flags);
 985                 spin_lock(&vdev->priv_lock);
 986
 987                 kfree(unlink);
 988         }
 989
 990         spin_unlock(&vdev->priv_lock);
 991         spin_unlock_irqrestore(&vhci->lock, flags);
 992 }
 993
 994 /*
 995  * The important thing is that only one context begins cleanup.
 996  * This is why error handling and cleanup become simple.
 997  * We do not want to consider race condition as possible.
 998  */
 999 static void vhci_shutdown_connection(struct usbip_device *ud)
1000 {
1001         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1002
1003         /* need this? see stub_dev.c */
1004         if (ud->tcp_socket) {
1005                 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
1006                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
1007         }
1008
1009         /* kill threads related to this sdev */
1010         if (vdev->ud.tcp_rx) {
1011                 kthread_stop_put(vdev->ud.tcp_rx);
1012                 vdev->ud.tcp_rx = NULL;
1013         }
1014         if (vdev->ud.tcp_tx) {
1015                 kthread_stop_put(vdev->ud.tcp_tx);
1016                 vdev->ud.tcp_tx = NULL;
1017         }
1018         pr_info("stop threads\n");
1019
1020         /* active connection is closed */
1021         if (vdev->ud.tcp_socket) {
1022                 sockfd_put(vdev->ud.tcp_socket);
1023                 vdev->ud.tcp_socket = NULL;
1024                 vdev->ud.sockfd = -1;
1025         }
1026         pr_info("release socket\n");
1027
1028         vhci_device_unlink_cleanup(vdev);
1029
1030         /*
1031          * rh_port_disconnect() is a trigger of ...
1032          *   usb_disable_device():
1033          *      disable all the endpoints for a USB device.
1034          *   usb_disable_endpoint():
1035          *      disable endpoints. pending urbs are unlinked(dequeued).
1036          *
1037          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1038          * detached device should release used urbs in a cleanup function (i.e.
1039          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1040          * pushed urbs and their private data in this function.
1041          *
1042          * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1043          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1044          * gives back pushed urbs and frees their private data by request of
1045          * the cleanup function of a USB driver. When unlinking a urb with an
1046          * active connection, vhci_dequeue() does not give back the urb which
1047          * is actually given back by vhci_rx after receiving its return pdu.
1048          *
1049          */
1050         rh_port_disconnect(vdev);
1051
1052         pr_info("disconnect device\n");
1053 }
1054
1055 static void vhci_device_reset(struct usbip_device *ud)
1056 {
1057         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1058         unsigned long flags;
1059
1060         spin_lock_irqsave(&ud->lock, flags);
1061
1062         vdev->speed  = 0;
1063         vdev->devid  = 0;
1064
1065         usb_put_dev(vdev->udev);
1066         vdev->udev = NULL;
1067
1068         if (ud->tcp_socket) {
1069                 sockfd_put(ud->tcp_socket);
1070                 ud->tcp_socket = NULL;
1071                 ud->sockfd = -1;
1072         }
1073         ud->status = VDEV_ST_NULL;
1074
1075         spin_unlock_irqrestore(&ud->lock, flags);
1076 }
1077
1078 static void vhci_device_unusable(struct usbip_device *ud)
1079 {
1080         unsigned long flags;
1081
1082         spin_lock_irqsave(&ud->lock, flags);
1083         ud->status = VDEV_ST_ERROR;
1084         spin_unlock_irqrestore(&ud->lock, flags);
1085 }
1086
1087 static void vhci_device_init(struct vhci_device *vdev)
1088 {
1089         memset(vdev, 0, sizeof(struct vhci_device));
1090
1091         vdev->ud.side   = USBIP_VHCI;
1092         vdev->ud.status = VDEV_ST_NULL;
1093         spin_lock_init(&vdev->ud.lock);
1094
1095         INIT_LIST_HEAD(&vdev->priv_rx);
1096         INIT_LIST_HEAD(&vdev->priv_tx);
1097         INIT_LIST_HEAD(&vdev->unlink_tx);
1098         INIT_LIST_HEAD(&vdev->unlink_rx);
1099         spin_lock_init(&vdev->priv_lock);
1100
1101         init_waitqueue_head(&vdev->waitq_tx);
1102
1103         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1104         vdev->ud.eh_ops.reset = vhci_device_reset;
1105         vdev->ud.eh_ops.unusable = vhci_device_unusable;
1106
1107         usbip_start_eh(&vdev->ud);
1108 }
1109
1110 static int hcd_name_to_id(const char *name)
1111 {
1112         char *c;
1113         long val;
1114         int ret;
1115
1116         c = strchr(name, '.');
1117         if (c == NULL)
1118                 return 0;
1119
1120         ret = kstrtol(c+1, 10, &val);
1121         if (ret < 0)
1122                 return ret;
1123
1124         return val;
1125 }
1126
1127 static int vhci_setup(struct usb_hcd *hcd)
1128 {
1129         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1130         if (usb_hcd_is_primary_hcd(hcd)) {
1131                 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1132                 vhci->vhci_hcd_hs->vhci = vhci;
1133                 /*
1134                  * Mark the first roothub as being USB 2.0.
1135                  * The USB 3.0 roothub will be registered later by
1136                  * vhci_hcd_probe()
1137                  */
1138                 hcd->speed = HCD_USB2;
1139                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1140         } else {
1141                 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1142                 vhci->vhci_hcd_ss->vhci = vhci;
1143                 hcd->speed = HCD_USB3;
1144                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1145         }
1146
1147         /*
1148          * Support SG.
1149          * sg_tablesize is an arbitrary value to alleviate memory pressure
1150          * on the host.
1151          */
1152         hcd->self.sg_tablesize = 32;
1153         hcd->self.no_sg_constraint = 1;
1154
1155         return 0;
1156 }
1157
1158 static int vhci_start(struct usb_hcd *hcd)
1159 {
1160         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1161         int id, rhport;
1162         int err;
1163
1164         usbip_dbg_vhci_hc("enter vhci_start\n");
1165
1166         if (usb_hcd_is_primary_hcd(hcd))
1167                 spin_lock_init(&vhci_hcd->vhci->lock);
1168
1169         /* initialize private data of usb_hcd */
1170
1171         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1172                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1173
1174                 vhci_device_init(vdev);
1175                 vdev->rhport = rhport;
1176         }
1177
1178         atomic_set(&vhci_hcd->seqnum, 0);
1179
1180         hcd->power_budget = 0; /* no limit */
1181         hcd->uses_new_polling = 1;
1182
1183 #ifdef CONFIG_USB_OTG
1184         hcd->self.otg_port = 1;
1185 #endif
1186
1187         id = hcd_name_to_id(hcd_name(hcd));
1188         if (id < 0) {
1189                 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1190                 return -EINVAL;
1191         }
1192
1193         /* vhci_hcd is now ready to be controlled through sysfs */
1194         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1195                 err = vhci_init_attr_group();
1196                 if (err) {
1197                         dev_err(hcd_dev(hcd), "init attr group failed, err = %d\n", err);
1198                         return err;
1199                 }
1200                 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1201                 if (err) {
1202                         dev_err(hcd_dev(hcd), "create sysfs files failed, err = %d\n", err);
1203                         vhci_finish_attr_group();
1204                         return err;
1205                 }
1206                 pr_info("created sysfs %s\n", hcd_name(hcd));
1207         }
1208
1209         return 0;
1210 }
1211
1212 static void vhci_stop(struct usb_hcd *hcd)
1213 {
1214         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1215         int id, rhport;
1216
1217         usbip_dbg_vhci_hc("stop VHCI controller\n");
1218
1219         /* 1. remove the userland interface of vhci_hcd */
1220         id = hcd_name_to_id(hcd_name(hcd));
1221         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1222                 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1223                 vhci_finish_attr_group();
1224         }
1225
1226         /* 2. shutdown all the ports of vhci_hcd */
1227         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1228                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1229
1230                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1231                 usbip_stop_eh(&vdev->ud);
1232         }
1233 }
1234
1235 static int vhci_get_frame_number(struct usb_hcd *hcd)
1236 {
1237         dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1238         return 0;
1239 }
1240
1241 #ifdef CONFIG_PM
1242
1243 /* FIXME: suspend/resume */
1244 static int vhci_bus_suspend(struct usb_hcd *hcd)
1245 {
1246         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1247         unsigned long flags;
1248
1249         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1250
1251         spin_lock_irqsave(&vhci->lock, flags);
1252         hcd->state = HC_STATE_SUSPENDED;
1253         spin_unlock_irqrestore(&vhci->lock, flags);
1254
1255         return 0;
1256 }
1257
1258 static int vhci_bus_resume(struct usb_hcd *hcd)
1259 {
1260         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1261         int rc = 0;
1262         unsigned long flags;
1263
1264         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1265
1266         spin_lock_irqsave(&vhci->lock, flags);
1267         if (!HCD_HW_ACCESSIBLE(hcd))
1268                 rc = -ESHUTDOWN;
1269         else
1270                 hcd->state = HC_STATE_RUNNING;
1271         spin_unlock_irqrestore(&vhci->lock, flags);
1272
1273         return rc;
1274 }
1275
1276 #else
1277
1278 #define vhci_bus_suspend      NULL
1279 #define vhci_bus_resume       NULL
1280 #endif
1281
1282 /* Change a group of bulk endpoints to support multiple stream IDs */
1283 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1284         struct usb_host_endpoint **eps, unsigned int num_eps,
1285         unsigned int num_streams, gfp_t mem_flags)
1286 {
1287         dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1288         return 0;
1289 }
1290
1291 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1292 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1293         struct usb_host_endpoint **eps, unsigned int num_eps,
1294         gfp_t mem_flags)
1295 {
1296         dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1297         return 0;
1298 }
1299
1300 static const struct hc_driver vhci_hc_driver = {
1301         .description    = driver_name,
1302         .product_desc   = driver_desc,
1303         .hcd_priv_size  = sizeof(struct vhci_hcd),
1304
1305         .flags          = HCD_USB3 | HCD_SHARED,
1306
1307         .reset          = vhci_setup,
1308         .start          = vhci_start,
1309         .stop           = vhci_stop,
1310
1311         .urb_enqueue    = vhci_urb_enqueue,
1312         .urb_dequeue    = vhci_urb_dequeue,
1313
1314         .get_frame_number = vhci_get_frame_number,
1315
1316         .hub_status_data = vhci_hub_status,
1317         .hub_control    = vhci_hub_control,
1318         .bus_suspend    = vhci_bus_suspend,
1319         .bus_resume     = vhci_bus_resume,
1320
1321         .alloc_streams  = vhci_alloc_streams,
1322         .free_streams   = vhci_free_streams,
1323 };
1324
1325 static int vhci_hcd_probe(struct platform_device *pdev)
1326 {
1327         struct vhci             *vhci = *((void **)dev_get_platdata(&pdev->dev));
1328         struct usb_hcd          *hcd_hs;
1329         struct usb_hcd          *hcd_ss;
1330         int                     ret;
1331
1332         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1333
1334         /*
1335          * Allocate and initialize hcd.
1336          * Our private data is also allocated automatically.
1337          */
1338         hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1339         if (!hcd_hs) {
1340                 pr_err("create primary hcd failed\n");
1341                 return -ENOMEM;
1342         }
1343         hcd_hs->has_tt = 1;
1344
1345         /*
1346          * Finish generic HCD structure initialization and register.
1347          * Call the driver's reset() and start() routines.
1348          */
1349         ret = usb_add_hcd(hcd_hs, 0, 0);
1350         if (ret != 0) {
1351                 pr_err("usb_add_hcd hs failed %d\n", ret);
1352                 goto put_usb2_hcd;
1353         }
1354
1355         hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1356                                        dev_name(&pdev->dev), hcd_hs);
1357         if (!hcd_ss) {
1358                 ret = -ENOMEM;
1359                 pr_err("create shared hcd failed\n");
1360                 goto remove_usb2_hcd;
1361         }
1362
1363         ret = usb_add_hcd(hcd_ss, 0, 0);
1364         if (ret) {
1365                 pr_err("usb_add_hcd ss failed %d\n", ret);
1366                 goto put_usb3_hcd;
1367         }
1368
1369         usbip_dbg_vhci_hc("bye\n");
1370         return 0;
1371
1372 put_usb3_hcd:
1373         usb_put_hcd(hcd_ss);
1374 remove_usb2_hcd:
1375         usb_remove_hcd(hcd_hs);
1376 put_usb2_hcd:
1377         usb_put_hcd(hcd_hs);
1378         vhci->vhci_hcd_hs = NULL;
1379         vhci->vhci_hcd_ss = NULL;
1380         return ret;
1381 }
1382
1383 static int vhci_hcd_remove(struct platform_device *pdev)
1384 {
1385         struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1386
1387         /*
1388          * Disconnects the root hub,
1389          * then reverses the effects of usb_add_hcd(),
1390          * invoking the HCD's stop() methods.
1391          */
1392         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1393         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1394
1395         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1396         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1397
1398         vhci->vhci_hcd_hs = NULL;
1399         vhci->vhci_hcd_ss = NULL;
1400
1401         return 0;
1402 }
1403
1404 #ifdef CONFIG_PM
1405
1406 /* what should happen for USB/IP under suspend/resume? */
1407 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1408 {
1409         struct usb_hcd *hcd;
1410         struct vhci *vhci;
1411         int rhport;
1412         int connected = 0;
1413         int ret = 0;
1414         unsigned long flags;
1415
1416         dev_dbg(&pdev->dev, "%s\n", __func__);
1417
1418         hcd = platform_get_drvdata(pdev);
1419         if (!hcd)
1420                 return 0;
1421
1422         vhci = *((void **)dev_get_platdata(hcd->self.controller));
1423
1424         spin_lock_irqsave(&vhci->lock, flags);
1425
1426         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1427                 if (vhci->vhci_hcd_hs->port_status[rhport] &
1428                     USB_PORT_STAT_CONNECTION)
1429                         connected += 1;
1430
1431                 if (vhci->vhci_hcd_ss->port_status[rhport] &
1432                     USB_PORT_STAT_CONNECTION)
1433                         connected += 1;
1434         }
1435
1436         spin_unlock_irqrestore(&vhci->lock, flags);
1437
1438         if (connected > 0) {
1439                 dev_info(&pdev->dev,
1440                          "We have %d active connection%s. Do not suspend.\n",
1441                          connected, (connected == 1 ? "" : "s"));
1442                 ret =  -EBUSY;
1443         } else {
1444                 dev_info(&pdev->dev, "suspend vhci_hcd");
1445                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1446         }
1447
1448         return ret;
1449 }
1450
1451 static int vhci_hcd_resume(struct platform_device *pdev)
1452 {
1453         struct usb_hcd *hcd;
1454
1455         dev_dbg(&pdev->dev, "%s\n", __func__);
1456
1457         hcd = platform_get_drvdata(pdev);
1458         if (!hcd)
1459                 return 0;
1460         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1461         usb_hcd_poll_rh_status(hcd);
1462
1463         return 0;
1464 }
1465
1466 #else
1467
1468 #define vhci_hcd_suspend        NULL
1469 #define vhci_hcd_resume         NULL
1470
1471 #endif
1472
1473 static struct platform_driver vhci_driver = {
1474         .probe  = vhci_hcd_probe,
1475         .remove = vhci_hcd_remove,
1476         .suspend = vhci_hcd_suspend,
1477         .resume = vhci_hcd_resume,
1478         .driver = {
1479                 .name = driver_name,
1480         },
1481 };
1482
1483 static void del_platform_devices(void)
1484 {
1485         struct platform_device *pdev;
1486         int i;
1487
1488         for (i = 0; i < vhci_num_controllers; i++) {
1489                 pdev = vhcis[i].pdev;
1490                 if (pdev != NULL)
1491                         platform_device_unregister(pdev);
1492                 vhcis[i].pdev = NULL;
1493         }
1494         sysfs_remove_link(&platform_bus.kobj, driver_name);
1495 }
1496
1497 static int __init vhci_hcd_init(void)
1498 {
1499         int i, ret;
1500
1501         if (usb_disabled())
1502                 return -ENODEV;
1503
1504         if (vhci_num_controllers < 1)
1505                 vhci_num_controllers = 1;
1506
1507         vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1508         if (vhcis == NULL)
1509                 return -ENOMEM;
1510
1511         for (i = 0; i < vhci_num_controllers; i++) {
1512                 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1513                 if (!vhcis[i].pdev) {
1514                         i--;
1515                         while (i >= 0)
1516                                 platform_device_put(vhcis[i--].pdev);
1517                         ret = -ENOMEM;
1518                         goto err_device_alloc;
1519                 }
1520         }
1521         for (i = 0; i < vhci_num_controllers; i++) {
1522                 void *vhci = &vhcis[i];
1523                 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1524                 if (ret)
1525                         goto err_driver_register;
1526         }
1527
1528         ret = platform_driver_register(&vhci_driver);
1529         if (ret)
1530                 goto err_driver_register;
1531
1532         for (i = 0; i < vhci_num_controllers; i++) {
1533                 ret = platform_device_add(vhcis[i].pdev);
1534                 if (ret < 0) {
1535                         i--;
1536                         while (i >= 0)
1537                                 platform_device_del(vhcis[i--].pdev);
1538                         goto err_add_hcd;
1539                 }
1540         }
1541
1542         return ret;
1543
1544 err_add_hcd:
1545         platform_driver_unregister(&vhci_driver);
1546 err_driver_register:
1547         for (i = 0; i < vhci_num_controllers; i++)
1548                 platform_device_put(vhcis[i].pdev);
1549 err_device_alloc:
1550         kfree(vhcis);
1551         return ret;
1552 }
1553
1554 static void __exit vhci_hcd_exit(void)
1555 {
1556         del_platform_devices();
1557         platform_driver_unregister(&vhci_driver);
1558         kfree(vhcis);
1559 }
1560
1561 module_init(vhci_hcd_init);
1562 module_exit(vhci_hcd_exit);
1563
1564 MODULE_AUTHOR(DRIVER_AUTHOR);
1565 MODULE_DESCRIPTION(DRIVER_DESC);
1566 MODULE_LICENSE("GPL");