drivers/usb/usbip/vhci

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This source file includes following definitions.
dump_port_status_diff
rh_port_connect
rh_port_disconnect
vhci_hub_status
ss_hub_descriptor
hub_descriptor
vhci_hub_control
vhci_tx_urb
vhci_urb_enqueue
vhci_urb_dequeue
vhci_device_unlink_cleanup
vhci_shutdown_connection
vhci_device_reset
vhci_device_unusable
vhci_device_init
hcd_name_to_id
vhci_setup
vhci_start
vhci_stop
vhci_get_frame_number
vhci_bus_suspend
vhci_bus_resume
vhci_alloc_streams
vhci_free_streams
vhci_hcd_probe
vhci_hcd_remove
vhci_hcd_suspend
vhci_hcd_resume
del_platform_devices
vhci_hcd_init
vhci_hcd_exit
   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                         /* Fall through */
 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                         /* FALLS THROUGH */
 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 
 588                         /* FALLS THROUGH */
 589                 default:
 590                         usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 591                                           wValue);
 592                         if (invalid_rhport) {
 593                                 pr_err("invalid port number %d\n", wIndex);
 594                                 goto error;
 595                         }
 596                         if (hcd->speed == HCD_USB3) {
 597                                 if ((vhci_hcd->port_status[rhport] &
 598                                      USB_SS_PORT_STAT_POWER) != 0) {
 599                                         vhci_hcd->port_status[rhport] |= (1 << wValue);
 600                                 }
 601                         } else
 602                                 if ((vhci_hcd->port_status[rhport] &
 603                                      USB_PORT_STAT_POWER) != 0) {
 604                                         vhci_hcd->port_status[rhport] |= (1 << wValue);
 605                                 }
 606                 }
 607                 break;
 608         case GetPortErrorCount:
 609                 usbip_dbg_vhci_rh(" GetPortErrorCount\n");
 610                 if (hcd->speed != HCD_USB3) {
 611                         pr_err("GetPortErrorCount req not "
 612                                "supported for USB 2.0 roothub\n");
 613                         goto error;
 614                 }
 615                 /* We'll always return 0 since this is a dummy hub */
 616                 *(__le32 *) buf = cpu_to_le32(0);
 617                 break;
 618         case SetHubDepth:
 619                 usbip_dbg_vhci_rh(" SetHubDepth\n");
 620                 if (hcd->speed != HCD_USB3) {
 621                         pr_err("SetHubDepth req not supported for "
 622                                "USB 2.0 roothub\n");
 623                         goto error;
 624                 }
 625                 break;
 626         default:
 627                 pr_err("default hub control req: %04x v%04x i%04x l%d\n",
 628                         typeReq, wValue, wIndex, wLength);
 629 error:
 630                 /* "protocol stall" on error */
 631                 retval = -EPIPE;
 632         }
 633 
 634         if (usbip_dbg_flag_vhci_rh) {
 635                 pr_debug("port %d\n", rhport);
 636                 /* Only dump valid port status */
 637                 if (!invalid_rhport) {
 638                         dump_port_status_diff(prev_port_status[rhport],
 639                                               vhci_hcd->port_status[rhport],
 640                                               hcd->speed == HCD_USB3);
 641                 }
 642         }
 643         usbip_dbg_vhci_rh(" bye\n");
 644 
 645         spin_unlock_irqrestore(&vhci->lock, flags);
 646 
 647         if (!invalid_rhport &&
 648             (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) {
 649                 usb_hcd_poll_rh_status(hcd);
 650         }
 651 
 652         return retval;
 653 }
 654 
 655 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
 656 {
 657         struct vhci_priv *priv;
 658         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 659         unsigned long flags;
 660 
 661         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 662         if (!priv) {
 663                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 664                 return;
 665         }
 666 
 667         spin_lock_irqsave(&vdev->priv_lock, flags);
 668 
 669         priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 670         if (priv->seqnum == 0xffff)
 671                 dev_info(&urb->dev->dev, "seqnum max\n");
 672 
 673         priv->vdev = vdev;
 674         priv->urb = urb;
 675 
 676         urb->hcpriv = (void *) priv;
 677 
 678         list_add_tail(&priv->list, &vdev->priv_tx);
 679 
 680         wake_up(&vdev->waitq_tx);
 681         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 682 }
 683 
 684 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
 685 {
 686         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 687         struct vhci *vhci = vhci_hcd->vhci;
 688         struct device *dev = &urb->dev->dev;
 689         u8 portnum = urb->dev->portnum;
 690         int ret = 0;
 691         struct vhci_device *vdev;
 692         unsigned long flags;
 693 
 694         if (portnum > VHCI_HC_PORTS) {
 695                 pr_err("invalid port number %d\n", portnum);
 696                 return -ENODEV;
 697         }
 698         vdev = &vhci_hcd->vdev[portnum-1];
 699 
 700         if (!urb->transfer_buffer && !urb->num_sgs &&
 701              urb->transfer_buffer_length) {
 702                 dev_dbg(dev, "Null URB transfer buffer\n");
 703                 return -EINVAL;
 704         }
 705 
 706         spin_lock_irqsave(&vhci->lock, flags);
 707 
 708         if (urb->status != -EINPROGRESS) {
 709                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 710                 spin_unlock_irqrestore(&vhci->lock, flags);
 711                 return urb->status;
 712         }
 713 
 714         /* refuse enqueue for dead connection */
 715         spin_lock(&vdev->ud.lock);
 716         if (vdev->ud.status == VDEV_ST_NULL ||
 717             vdev->ud.status == VDEV_ST_ERROR) {
 718                 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
 719                 spin_unlock(&vdev->ud.lock);
 720                 spin_unlock_irqrestore(&vhci->lock, flags);
 721                 return -ENODEV;
 722         }
 723         spin_unlock(&vdev->ud.lock);
 724 
 725         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 726         if (ret)
 727                 goto no_need_unlink;
 728 
 729         /*
 730          * The enumeration process is as follows;
 731          *
 732          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 733          *     to get max packet length of default pipe
 734          *
 735          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 736          *
 737          */
 738         if (usb_pipedevice(urb->pipe) == 0) {
 739                 __u8 type = usb_pipetype(urb->pipe);
 740                 struct usb_ctrlrequest *ctrlreq =
 741                         (struct usb_ctrlrequest *) urb->setup_packet;
 742 
 743                 if (type != PIPE_CONTROL || !ctrlreq) {
 744                         dev_err(dev, "invalid request to devnum 0\n");
 745                         ret = -EINVAL;
 746                         goto no_need_xmit;
 747                 }
 748 
 749                 switch (ctrlreq->bRequest) {
 750                 case USB_REQ_SET_ADDRESS:
 751                         /* set_address may come when a device is reset */
 752                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 753                                  ctrlreq->wValue, vdev->rhport);
 754 
 755                         usb_put_dev(vdev->udev);
 756                         vdev->udev = usb_get_dev(urb->dev);
 757 
 758                         spin_lock(&vdev->ud.lock);
 759                         vdev->ud.status = VDEV_ST_USED;
 760                         spin_unlock(&vdev->ud.lock);
 761 
 762                         if (urb->status == -EINPROGRESS) {
 763                                 /* This request is successfully completed. */
 764                                 /* If not -EINPROGRESS, possibly unlinked. */
 765                                 urb->status = 0;
 766                         }
 767 
 768                         goto no_need_xmit;
 769 
 770                 case USB_REQ_GET_DESCRIPTOR:
 771                         if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
 772                                 usbip_dbg_vhci_hc(
 773                                         "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
 774 
 775                         usb_put_dev(vdev->udev);
 776                         vdev->udev = usb_get_dev(urb->dev);
 777                         goto out;
 778 
 779                 default:
 780                         /* NOT REACHED */
 781                         dev_err(dev,
 782                                 "invalid request to devnum 0 bRequest %u, wValue %u\n",
 783                                 ctrlreq->bRequest,
 784                                 ctrlreq->wValue);
 785                         ret =  -EINVAL;
 786                         goto no_need_xmit;
 787                 }
 788 
 789         }
 790 
 791 out:
 792         vhci_tx_urb(urb, vdev);
 793         spin_unlock_irqrestore(&vhci->lock, flags);
 794 
 795         return 0;
 796 
 797 no_need_xmit:
 798         usb_hcd_unlink_urb_from_ep(hcd, urb);
 799 no_need_unlink:
 800         spin_unlock_irqrestore(&vhci->lock, flags);
 801         if (!ret)
 802                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 803         return ret;
 804 }
 805 
 806 /*
 807  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 808  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 809  * back its urb. For the driver unlinking the urb, the content of the urb is
 810  * not important, but the calling to its completion handler is important; the
 811  * completion of unlinking is notified by the completion handler.
 812  *
 813  *
 814  * CLIENT SIDE
 815  *
 816  * - When vhci_hcd receives RET_SUBMIT,
 817  *
 818  *      - case 1a). the urb of the pdu is not unlinking.
 819  *              - normal case
 820  *              => just give back the urb
 821  *
 822  *      - case 1b). the urb of the pdu is unlinking.
 823  *              - usbip.ko will return a reply of the unlinking request.
 824  *              => give back the urb now and go to case 2b).
 825  *
 826  * - When vhci_hcd receives RET_UNLINK,
 827  *
 828  *      - case 2a). a submit request is still pending in vhci_hcd.
 829  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 830  *                completed there.
 831  *              => free a pending submit request
 832  *              => notify unlink completeness by giving back the urb
 833  *
 834  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 835  *              - urb was already given back to the core driver.
 836  *              => do not give back the urb
 837  *
 838  *
 839  * SERVER SIDE
 840  *
 841  * - When usbip receives CMD_UNLINK,
 842  *
 843  *      - case 3a). the urb of the unlink request is now in submission.
 844  *              => do usb_unlink_urb().
 845  *              => after the unlink is completed, send RET_UNLINK.
 846  *
 847  *      - case 3b). the urb of the unlink request is not in submission.
 848  *              - may be already completed or never be received
 849  *              => send RET_UNLINK
 850  *
 851  */
 852 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 853 {
 854         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
 855         struct vhci *vhci = vhci_hcd->vhci;
 856         struct vhci_priv *priv;
 857         struct vhci_device *vdev;
 858         unsigned long flags;
 859 
 860         spin_lock_irqsave(&vhci->lock, flags);
 861 
 862         priv = urb->hcpriv;
 863         if (!priv) {
 864                 /* URB was never linked! or will be soon given back by
 865                  * vhci_rx. */
 866                 spin_unlock_irqrestore(&vhci->lock, flags);
 867                 return -EIDRM;
 868         }
 869 
 870         {
 871                 int ret = 0;
 872 
 873                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 874                 if (ret) {
 875                         spin_unlock_irqrestore(&vhci->lock, flags);
 876                         return ret;
 877                 }
 878         }
 879 
 880          /* send unlink request here? */
 881         vdev = priv->vdev;
 882 
 883         if (!vdev->ud.tcp_socket) {
 884                 /* tcp connection is closed */
 885                 spin_lock(&vdev->priv_lock);
 886 
 887                 list_del(&priv->list);
 888                 kfree(priv);
 889                 urb->hcpriv = NULL;
 890 
 891                 spin_unlock(&vdev->priv_lock);
 892 
 893                 /*
 894                  * If tcp connection is alive, we have sent CMD_UNLINK.
 895                  * vhci_rx will receive RET_UNLINK and give back the URB.
 896                  * Otherwise, we give back it here.
 897                  */
 898                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 899 
 900                 spin_unlock_irqrestore(&vhci->lock, flags);
 901                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 902                 spin_lock_irqsave(&vhci->lock, flags);
 903 
 904         } else {
 905                 /* tcp connection is alive */
 906                 struct vhci_unlink *unlink;
 907 
 908                 spin_lock(&vdev->priv_lock);
 909 
 910                 /* setup CMD_UNLINK pdu */
 911                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 912                 if (!unlink) {
 913                         spin_unlock(&vdev->priv_lock);
 914                         spin_unlock_irqrestore(&vhci->lock, flags);
 915                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 916                         return -ENOMEM;
 917                 }
 918 
 919                 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
 920                 if (unlink->seqnum == 0xffff)
 921                         pr_info("seqnum max\n");
 922 
 923                 unlink->unlink_seqnum = priv->seqnum;
 924 
 925                 /* send cmd_unlink and try to cancel the pending URB in the
 926                  * peer */
 927                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 928                 wake_up(&vdev->waitq_tx);
 929 
 930                 spin_unlock(&vdev->priv_lock);
 931         }
 932 
 933         spin_unlock_irqrestore(&vhci->lock, flags);
 934 
 935         usbip_dbg_vhci_hc("leave\n");
 936         return 0;
 937 }
 938 
 939 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 940 {
 941         struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 942         struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
 943         struct vhci *vhci = vhci_hcd->vhci;
 944         struct vhci_unlink *unlink, *tmp;
 945         unsigned long flags;
 946 
 947         spin_lock_irqsave(&vhci->lock, flags);
 948         spin_lock(&vdev->priv_lock);
 949 
 950         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 951                 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 952                 list_del(&unlink->list);
 953                 kfree(unlink);
 954         }
 955 
 956         while (!list_empty(&vdev->unlink_rx)) {
 957                 struct urb *urb;
 958 
 959                 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
 960                         list);
 961 
 962                 /* give back URB of unanswered unlink request */
 963                 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 964 
 965                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 966                 if (!urb) {
 967                         pr_info("the urb (seqnum %lu) was already given back\n",
 968                                 unlink->unlink_seqnum);
 969                         list_del(&unlink->list);
 970                         kfree(unlink);
 971                         continue;
 972                 }
 973 
 974                 urb->status = -ENODEV;
 975 
 976                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 977 
 978                 list_del(&unlink->list);
 979 
 980                 spin_unlock(&vdev->priv_lock);
 981                 spin_unlock_irqrestore(&vhci->lock, flags);
 982 
 983                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 984 
 985                 spin_lock_irqsave(&vhci->lock, flags);
 986                 spin_lock(&vdev->priv_lock);
 987 
 988                 kfree(unlink);
 989         }
 990 
 991         spin_unlock(&vdev->priv_lock);
 992         spin_unlock_irqrestore(&vhci->lock, flags);
 993 }
 994 
 995 /*
 996  * The important thing is that only one context begins cleanup.
 997  * This is why error handling and cleanup become simple.
 998  * We do not want to consider race condition as possible.
 999  */
1000 static void vhci_shutdown_connection(struct usbip_device *ud)
1001 {
1002         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1003 
1004         /* need this? see stub_dev.c */
1005         if (ud->tcp_socket) {
1006                 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
1007                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
1008         }
1009 
1010         /* kill threads related to this sdev */
1011         if (vdev->ud.tcp_rx) {
1012                 kthread_stop_put(vdev->ud.tcp_rx);
1013                 vdev->ud.tcp_rx = NULL;
1014         }
1015         if (vdev->ud.tcp_tx) {
1016                 kthread_stop_put(vdev->ud.tcp_tx);
1017                 vdev->ud.tcp_tx = NULL;
1018         }
1019         pr_info("stop threads\n");
1020 
1021         /* active connection is closed */
1022         if (vdev->ud.tcp_socket) {
1023                 sockfd_put(vdev->ud.tcp_socket);
1024                 vdev->ud.tcp_socket = NULL;
1025                 vdev->ud.sockfd = -1;
1026         }
1027         pr_info("release socket\n");
1028 
1029         vhci_device_unlink_cleanup(vdev);
1030 
1031         /*
1032          * rh_port_disconnect() is a trigger of ...
1033          *   usb_disable_device():
1034          *      disable all the endpoints for a USB device.
1035          *   usb_disable_endpoint():
1036          *      disable endpoints. pending urbs are unlinked(dequeued).
1037          *
1038          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1039          * detached device should release used urbs in a cleanup function (i.e.
1040          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1041          * pushed urbs and their private data in this function.
1042          *
1043          * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1044          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1045          * gives back pushed urbs and frees their private data by request of
1046          * the cleanup function of a USB driver. When unlinking a urb with an
1047          * active connection, vhci_dequeue() does not give back the urb which
1048          * is actually given back by vhci_rx after receiving its return pdu.
1049          *
1050          */
1051         rh_port_disconnect(vdev);
1052 
1053         pr_info("disconnect device\n");
1054 }
1055 
1056 static void vhci_device_reset(struct usbip_device *ud)
1057 {
1058         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1059         unsigned long flags;
1060 
1061         spin_lock_irqsave(&ud->lock, flags);
1062 
1063         vdev->speed  = 0;
1064         vdev->devid  = 0;
1065 
1066         usb_put_dev(vdev->udev);
1067         vdev->udev = NULL;
1068 
1069         if (ud->tcp_socket) {
1070                 sockfd_put(ud->tcp_socket);
1071                 ud->tcp_socket = NULL;
1072                 ud->sockfd = -1;
1073         }
1074         ud->status = VDEV_ST_NULL;
1075 
1076         spin_unlock_irqrestore(&ud->lock, flags);
1077 }
1078 
1079 static void vhci_device_unusable(struct usbip_device *ud)
1080 {
1081         unsigned long flags;
1082 
1083         spin_lock_irqsave(&ud->lock, flags);
1084         ud->status = VDEV_ST_ERROR;
1085         spin_unlock_irqrestore(&ud->lock, flags);
1086 }
1087 
1088 static void vhci_device_init(struct vhci_device *vdev)
1089 {
1090         memset(vdev, 0, sizeof(struct vhci_device));
1091 
1092         vdev->ud.side   = USBIP_VHCI;
1093         vdev->ud.status = VDEV_ST_NULL;
1094         spin_lock_init(&vdev->ud.lock);
1095 
1096         INIT_LIST_HEAD(&vdev->priv_rx);
1097         INIT_LIST_HEAD(&vdev->priv_tx);
1098         INIT_LIST_HEAD(&vdev->unlink_tx);
1099         INIT_LIST_HEAD(&vdev->unlink_rx);
1100         spin_lock_init(&vdev->priv_lock);
1101 
1102         init_waitqueue_head(&vdev->waitq_tx);
1103 
1104         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1105         vdev->ud.eh_ops.reset = vhci_device_reset;
1106         vdev->ud.eh_ops.unusable = vhci_device_unusable;
1107 
1108         usbip_start_eh(&vdev->ud);
1109 }
1110 
1111 static int hcd_name_to_id(const char *name)
1112 {
1113         char *c;
1114         long val;
1115         int ret;
1116 
1117         c = strchr(name, '.');
1118         if (c == NULL)
1119                 return 0;
1120 
1121         ret = kstrtol(c+1, 10, &val);
1122         if (ret < 0)
1123                 return ret;
1124 
1125         return val;
1126 }
1127 
1128 static int vhci_setup(struct usb_hcd *hcd)
1129 {
1130         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1131         if (usb_hcd_is_primary_hcd(hcd)) {
1132                 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1133                 vhci->vhci_hcd_hs->vhci = vhci;
1134                 /*
1135                  * Mark the first roothub as being USB 2.0.
1136                  * The USB 3.0 roothub will be registered later by
1137                  * vhci_hcd_probe()
1138                  */
1139                 hcd->speed = HCD_USB2;
1140                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1141         } else {
1142                 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1143                 vhci->vhci_hcd_ss->vhci = vhci;
1144                 hcd->speed = HCD_USB3;
1145                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1146         }
1147 
1148         /*
1149          * Support SG.
1150          * sg_tablesize is an arbitrary value to alleviate memory pressure
1151          * on the host.
1152          */
1153         hcd->self.sg_tablesize = 32;
1154         hcd->self.no_sg_constraint = 1;
1155 
1156         return 0;
1157 }
1158 
1159 static int vhci_start(struct usb_hcd *hcd)
1160 {
1161         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1162         int id, rhport;
1163         int err;
1164 
1165         usbip_dbg_vhci_hc("enter vhci_start\n");
1166 
1167         if (usb_hcd_is_primary_hcd(hcd))
1168                 spin_lock_init(&vhci_hcd->vhci->lock);
1169 
1170         /* initialize private data of usb_hcd */
1171 
1172         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1173                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1174 
1175                 vhci_device_init(vdev);
1176                 vdev->rhport = rhport;
1177         }
1178 
1179         atomic_set(&vhci_hcd->seqnum, 0);
1180 
1181         hcd->power_budget = 0; /* no limit */
1182         hcd->uses_new_polling = 1;
1183 
1184 #ifdef CONFIG_USB_OTG
1185         hcd->self.otg_port = 1;
1186 #endif
1187 
1188         id = hcd_name_to_id(hcd_name(hcd));
1189         if (id < 0) {
1190                 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1191                 return -EINVAL;
1192         }
1193 
1194         /* vhci_hcd is now ready to be controlled through sysfs */
1195         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1196                 err = vhci_init_attr_group();
1197                 if (err) {
1198                         dev_err(hcd_dev(hcd), "init attr group failed, err = %d\n", err);
1199                         return err;
1200                 }
1201                 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1202                 if (err) {
1203                         dev_err(hcd_dev(hcd), "create sysfs files failed, err = %d\n", err);
1204                         vhci_finish_attr_group();
1205                         return err;
1206                 }
1207                 pr_info("created sysfs %s\n", hcd_name(hcd));
1208         }
1209 
1210         return 0;
1211 }
1212 
1213 static void vhci_stop(struct usb_hcd *hcd)
1214 {
1215         struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1216         int id, rhport;
1217 
1218         usbip_dbg_vhci_hc("stop VHCI controller\n");
1219 
1220         /* 1. remove the userland interface of vhci_hcd */
1221         id = hcd_name_to_id(hcd_name(hcd));
1222         if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1223                 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1224                 vhci_finish_attr_group();
1225         }
1226 
1227         /* 2. shutdown all the ports of vhci_hcd */
1228         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1229                 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1230 
1231                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1232                 usbip_stop_eh(&vdev->ud);
1233         }
1234 }
1235 
1236 static int vhci_get_frame_number(struct usb_hcd *hcd)
1237 {
1238         dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1239         return 0;
1240 }
1241 
1242 #ifdef CONFIG_PM
1243 
1244 /* FIXME: suspend/resume */
1245 static int vhci_bus_suspend(struct usb_hcd *hcd)
1246 {
1247         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1248         unsigned long flags;
1249 
1250         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1251 
1252         spin_lock_irqsave(&vhci->lock, flags);
1253         hcd->state = HC_STATE_SUSPENDED;
1254         spin_unlock_irqrestore(&vhci->lock, flags);
1255 
1256         return 0;
1257 }
1258 
1259 static int vhci_bus_resume(struct usb_hcd *hcd)
1260 {
1261         struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1262         int rc = 0;
1263         unsigned long flags;
1264 
1265         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1266 
1267         spin_lock_irqsave(&vhci->lock, flags);
1268         if (!HCD_HW_ACCESSIBLE(hcd))
1269                 rc = -ESHUTDOWN;
1270         else
1271                 hcd->state = HC_STATE_RUNNING;
1272         spin_unlock_irqrestore(&vhci->lock, flags);
1273 
1274         return rc;
1275 }
1276 
1277 #else
1278 
1279 #define vhci_bus_suspend      NULL
1280 #define vhci_bus_resume       NULL
1281 #endif
1282 
1283 /* Change a group of bulk endpoints to support multiple stream IDs */
1284 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1285         struct usb_host_endpoint **eps, unsigned int num_eps,
1286         unsigned int num_streams, gfp_t mem_flags)
1287 {
1288         dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1289         return 0;
1290 }
1291 
1292 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1293 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1294         struct usb_host_endpoint **eps, unsigned int num_eps,
1295         gfp_t mem_flags)
1296 {
1297         dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1298         return 0;
1299 }
1300 
1301 static const struct hc_driver vhci_hc_driver = {
1302         .description    = driver_name,
1303         .product_desc   = driver_desc,
1304         .hcd_priv_size  = sizeof(struct vhci_hcd),
1305 
1306         .flags          = HCD_USB3 | HCD_SHARED,
1307 
1308         .reset          = vhci_setup,
1309         .start          = vhci_start,
1310         .stop           = vhci_stop,
1311 
1312         .urb_enqueue    = vhci_urb_enqueue,
1313         .urb_dequeue    = vhci_urb_dequeue,
1314 
1315         .get_frame_number = vhci_get_frame_number,
1316 
1317         .hub_status_data = vhci_hub_status,
1318         .hub_control    = vhci_hub_control,
1319         .bus_suspend    = vhci_bus_suspend,
1320         .bus_resume     = vhci_bus_resume,
1321 
1322         .alloc_streams  = vhci_alloc_streams,
1323         .free_streams   = vhci_free_streams,
1324 };
1325 
1326 static int vhci_hcd_probe(struct platform_device *pdev)
1327 {
1328         struct vhci             *vhci = *((void **)dev_get_platdata(&pdev->dev));
1329         struct usb_hcd          *hcd_hs;
1330         struct usb_hcd          *hcd_ss;
1331         int                     ret;
1332 
1333         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1334 
1335         /*
1336          * Allocate and initialize hcd.
1337          * Our private data is also allocated automatically.
1338          */
1339         hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1340         if (!hcd_hs) {
1341                 pr_err("create primary hcd failed\n");
1342                 return -ENOMEM;
1343         }
1344         hcd_hs->has_tt = 1;
1345 
1346         /*
1347          * Finish generic HCD structure initialization and register.
1348          * Call the driver's reset() and start() routines.
1349          */
1350         ret = usb_add_hcd(hcd_hs, 0, 0);
1351         if (ret != 0) {
1352                 pr_err("usb_add_hcd hs failed %d\n", ret);
1353                 goto put_usb2_hcd;
1354         }
1355 
1356         hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1357                                        dev_name(&pdev->dev), hcd_hs);
1358         if (!hcd_ss) {
1359                 ret = -ENOMEM;
1360                 pr_err("create shared hcd failed\n");
1361                 goto remove_usb2_hcd;
1362         }
1363 
1364         ret = usb_add_hcd(hcd_ss, 0, 0);
1365         if (ret) {
1366                 pr_err("usb_add_hcd ss failed %d\n", ret);
1367                 goto put_usb3_hcd;
1368         }
1369 
1370         usbip_dbg_vhci_hc("bye\n");
1371         return 0;
1372 
1373 put_usb3_hcd:
1374         usb_put_hcd(hcd_ss);
1375 remove_usb2_hcd:
1376         usb_remove_hcd(hcd_hs);
1377 put_usb2_hcd:
1378         usb_put_hcd(hcd_hs);
1379         vhci->vhci_hcd_hs = NULL;
1380         vhci->vhci_hcd_ss = NULL;
1381         return ret;
1382 }
1383 
1384 static int vhci_hcd_remove(struct platform_device *pdev)
1385 {
1386         struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1387 
1388         /*
1389          * Disconnects the root hub,
1390          * then reverses the effects of usb_add_hcd(),
1391          * invoking the HCD's stop() methods.
1392          */
1393         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1394         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1395 
1396         usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1397         usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1398 
1399         vhci->vhci_hcd_hs = NULL;
1400         vhci->vhci_hcd_ss = NULL;
1401 
1402         return 0;
1403 }
1404 
1405 #ifdef CONFIG_PM
1406 
1407 /* what should happen for USB/IP under suspend/resume? */
1408 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1409 {
1410         struct usb_hcd *hcd;
1411         struct vhci *vhci;
1412         int rhport;
1413         int connected = 0;
1414         int ret = 0;
1415         unsigned long flags;
1416 
1417         dev_dbg(&pdev->dev, "%s\n", __func__);
1418 
1419         hcd = platform_get_drvdata(pdev);
1420         if (!hcd)
1421                 return 0;
1422 
1423         vhci = *((void **)dev_get_platdata(hcd->self.controller));
1424 
1425         spin_lock_irqsave(&vhci->lock, flags);
1426 
1427         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1428                 if (vhci->vhci_hcd_hs->port_status[rhport] &
1429                     USB_PORT_STAT_CONNECTION)
1430                         connected += 1;
1431 
1432                 if (vhci->vhci_hcd_ss->port_status[rhport] &
1433                     USB_PORT_STAT_CONNECTION)
1434                         connected += 1;
1435         }
1436 
1437         spin_unlock_irqrestore(&vhci->lock, flags);
1438 
1439         if (connected > 0) {
1440                 dev_info(&pdev->dev,
1441                          "We have %d active connection%s. Do not suspend.\n",
1442                          connected, (connected == 1 ? "" : "s"));
1443                 ret =  -EBUSY;
1444         } else {
1445                 dev_info(&pdev->dev, "suspend vhci_hcd");
1446                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1447         }
1448 
1449         return ret;
1450 }
1451 
1452 static int vhci_hcd_resume(struct platform_device *pdev)
1453 {
1454         struct usb_hcd *hcd;
1455 
1456         dev_dbg(&pdev->dev, "%s\n", __func__);
1457 
1458         hcd = platform_get_drvdata(pdev);
1459         if (!hcd)
1460                 return 0;
1461         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1462         usb_hcd_poll_rh_status(hcd);
1463 
1464         return 0;
1465 }
1466 
1467 #else
1468 
1469 #define vhci_hcd_suspend        NULL
1470 #define vhci_hcd_resume         NULL
1471 
1472 #endif
1473 
1474 static struct platform_driver vhci_driver = {
1475         .probe  = vhci_hcd_probe,
1476         .remove = vhci_hcd_remove,
1477         .suspend = vhci_hcd_suspend,
1478         .resume = vhci_hcd_resume,
1479         .driver = {
1480                 .name = driver_name,
1481         },
1482 };
1483 
1484 static void del_platform_devices(void)
1485 {
1486         struct platform_device *pdev;
1487         int i;
1488 
1489         for (i = 0; i < vhci_num_controllers; i++) {
1490                 pdev = vhcis[i].pdev;
1491                 if (pdev != NULL)
1492                         platform_device_unregister(pdev);
1493                 vhcis[i].pdev = NULL;
1494         }
1495         sysfs_remove_link(&platform_bus.kobj, driver_name);
1496 }
1497 
1498 static int __init vhci_hcd_init(void)
1499 {
1500         int i, ret;
1501 
1502         if (usb_disabled())
1503                 return -ENODEV;
1504 
1505         if (vhci_num_controllers < 1)
1506                 vhci_num_controllers = 1;
1507 
1508         vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1509         if (vhcis == NULL)
1510                 return -ENOMEM;
1511 
1512         for (i = 0; i < vhci_num_controllers; i++) {
1513                 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1514                 if (!vhcis[i].pdev) {
1515                         i--;
1516                         while (i >= 0)
1517                                 platform_device_put(vhcis[i--].pdev);
1518                         ret = -ENOMEM;
1519                         goto err_device_alloc;
1520                 }
1521         }
1522         for (i = 0; i < vhci_num_controllers; i++) {
1523                 void *vhci = &vhcis[i];
1524                 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1525                 if (ret)
1526                         goto err_driver_register;
1527         }
1528 
1529         ret = platform_driver_register(&vhci_driver);
1530         if (ret)
1531                 goto err_driver_register;
1532 
1533         for (i = 0; i < vhci_num_controllers; i++) {
1534                 ret = platform_device_add(vhcis[i].pdev);
1535                 if (ret < 0) {
1536                         i--;
1537                         while (i >= 0)
1538                                 platform_device_del(vhcis[i--].pdev);
1539                         goto err_add_hcd;
1540                 }
1541         }
1542 
1543         return ret;
1544 
1545 err_add_hcd:
1546         platform_driver_unregister(&vhci_driver);
1547 err_driver_register:
1548         for (i = 0; i < vhci_num_controllers; i++)
1549                 platform_device_put(vhcis[i].pdev);
1550 err_device_alloc:
1551         kfree(vhcis);
1552         return ret;
1553 }
1554 
1555 static void __exit vhci_hcd_exit(void)
1556 {
1557         del_platform_devices();
1558         platform_driver_unregister(&vhci_driver);
1559         kfree(vhcis);
1560 }
1561 
1562 module_init(vhci_hcd_init);
1563 module_exit(vhci_hcd_exit);
1564 
1565 MODULE_AUTHOR(DRIVER_AUTHOR);
1566 MODULE_DESCRIPTION(DRIVER_DESC);
1567 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/usb/usbip/vhci_hcd.c

DEFINITIONS
