1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2003-2008 Takahiro Hirofuchi 4 * Copyright (C) 2015-2016 Nobuo Iwata 5 */ 6 7 #include <linux/init.h> 8 #include <linux/file.h> 9 #include <linux/kernel.h> 10 #include <linux/kthread.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/slab.h> 14 15 #include "usbip_common.h" 16 #include "vhci.h" 17 18 #define DRIVER_AUTHOR "Takahiro Hirofuchi" 19 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver" 20 21 /* 22 * TODO 23 * - update root hub emulation 24 * - move the emulation code to userland ? 25 * porting to other operating systems 26 * minimize kernel code 27 * - add suspend/resume code 28 * - clean up everything 29 */ 30 31 /* See usb gadget dummy hcd */ 32 33 static int vhci_hub_status(struct usb_hcd *hcd, char *buff); 34 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 35 u16 wIndex, char *buff, u16 wLength); 36 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, 37 gfp_t mem_flags); 38 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status); 39 static int vhci_start(struct usb_hcd *vhci_hcd); 40 static void vhci_stop(struct usb_hcd *hcd); 41 static int vhci_get_frame_number(struct usb_hcd *hcd); 42 43 static const char driver_name[] = "vhci_hcd"; 44 static const char driver_desc[] = "USB/IP Virtual Host Controller"; 45 46 int vhci_num_controllers = VHCI_NR_HCS; 47 struct vhci *vhcis; 48 49 static const char * const bit_desc[] = { 50 "CONNECTION", /*0*/ 51 "ENABLE", /*1*/ 52 "SUSPEND", /*2*/ 53 "OVER_CURRENT", /*3*/ 54 "RESET", /*4*/ 55 "L1", /*5*/ 56 "R6", /*6*/ 57 "R7", /*7*/ 58 "POWER", /*8*/ 59 "LOWSPEED", /*9*/ 60 "HIGHSPEED", /*10*/ 61 "PORT_TEST", /*11*/ 62 "INDICATOR", /*12*/ 63 "R13", /*13*/ 64 "R14", /*14*/ 65 "R15", /*15*/ 66 "C_CONNECTION", /*16*/ 67 "C_ENABLE", /*17*/ 68 "C_SUSPEND", /*18*/ 69 "C_OVER_CURRENT", /*19*/ 70 "C_RESET", /*20*/ 71 "C_L1", /*21*/ 72 "R22", /*22*/ 73 "R23", /*23*/ 74 "R24", /*24*/ 75 "R25", /*25*/ 76 "R26", /*26*/ 77 "R27", /*27*/ 78 "R28", /*28*/ 79 "R29", /*29*/ 80 "R30", /*30*/ 81 "R31", /*31*/ 82 }; 83 84 static const char * const bit_desc_ss[] = { 85 "CONNECTION", /*0*/ 86 "ENABLE", /*1*/ 87 "SUSPEND", /*2*/ 88 "OVER_CURRENT", /*3*/ 89 "RESET", /*4*/ 90 "L1", /*5*/ 91 "R6", /*6*/ 92 "R7", /*7*/ 93 "R8", /*8*/ 94 "POWER", /*9*/ 95 "HIGHSPEED", /*10*/ 96 "PORT_TEST", /*11*/ 97 "INDICATOR", /*12*/ 98 "R13", /*13*/ 99 "R14", /*14*/ 100 "R15", /*15*/ 101 "C_CONNECTION", /*16*/ 102 "C_ENABLE", /*17*/ 103 "C_SUSPEND", /*18*/ 104 "C_OVER_CURRENT", /*19*/ 105 "C_RESET", /*20*/ 106 "C_BH_RESET", /*21*/ 107 "C_LINK_STATE", /*22*/ 108 "C_CONFIG_ERROR", /*23*/ 109 "R24", /*24*/ 110 "R25", /*25*/ 111 "R26", /*26*/ 112 "R27", /*27*/ 113 "R28", /*28*/ 114 "R29", /*29*/ 115 "R30", /*30*/ 116 "R31", /*31*/ 117 }; 118 119 static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3) 120 { 121 int i = 0; 122 u32 bit = 1; 123 const char * const *desc = bit_desc; 124 125 if (usb3) 126 desc = bit_desc_ss; 127 128 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status); 129 while (bit) { 130 u32 prev = prev_status & bit; 131 u32 new = new_status & bit; 132 char change; 133 134 if (!prev && new) 135 change = '+'; 136 else if (prev && !new) 137 change = '-'; 138 else 139 change = ' '; 140 141 if (prev || new) { 142 pr_debug(" %c%s\n", change, desc[i]); 143 144 if (bit == 1) /* USB_PORT_STAT_CONNECTION */ 145 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS"); 146 } 147 bit <<= 1; 148 i++; 149 } 150 pr_debug("\n"); 151 } 152 153 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed) 154 { 155 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 156 struct vhci *vhci = vhci_hcd->vhci; 157 int rhport = vdev->rhport; 158 u32 status; 159 unsigned long flags; 160 161 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport); 162 163 spin_lock_irqsave(&vhci->lock, flags); 164 165 status = vhci_hcd->port_status[rhport]; 166 167 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION); 168 169 switch (speed) { 170 case USB_SPEED_HIGH: 171 status |= USB_PORT_STAT_HIGH_SPEED; 172 break; 173 case USB_SPEED_LOW: 174 status |= USB_PORT_STAT_LOW_SPEED; 175 break; 176 default: 177 break; 178 } 179 180 vhci_hcd->port_status[rhport] = status; 181 182 spin_unlock_irqrestore(&vhci->lock, flags); 183 184 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd)); 185 } 186 187 static void rh_port_disconnect(struct vhci_device *vdev) 188 { 189 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 190 struct vhci *vhci = vhci_hcd->vhci; 191 int rhport = vdev->rhport; 192 u32 status; 193 unsigned long flags; 194 195 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport); 196 197 spin_lock_irqsave(&vhci->lock, flags); 198 199 status = vhci_hcd->port_status[rhport]; 200 201 status &= ~USB_PORT_STAT_CONNECTION; 202 status |= (1 << USB_PORT_FEAT_C_CONNECTION); 203 204 vhci_hcd->port_status[rhport] = status; 205 206 spin_unlock_irqrestore(&vhci->lock, flags); 207 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd)); 208 } 209 210 #define PORT_C_MASK \ 211 ((USB_PORT_STAT_C_CONNECTION \ 212 | USB_PORT_STAT_C_ENABLE \ 213 | USB_PORT_STAT_C_SUSPEND \ 214 | USB_PORT_STAT_C_OVERCURRENT \ 215 | USB_PORT_STAT_C_RESET) << 16) 216 217 /* 218 * Returns 0 if the status hasn't changed, or the number of bytes in buf. 219 * Ports are 0-indexed from the HCD point of view, 220 * and 1-indexed from the USB core pointer of view. 221 * 222 * @buf: a bitmap to show which port status has been changed. 223 * bit 0: reserved 224 * bit 1: the status of port 0 has been changed. 225 * bit 2: the status of port 1 has been changed. 226 * ... 227 */ 228 static int vhci_hub_status(struct usb_hcd *hcd, char *buf) 229 { 230 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 231 struct vhci *vhci = vhci_hcd->vhci; 232 int retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8); 233 int rhport; 234 int changed = 0; 235 unsigned long flags; 236 237 memset(buf, 0, retval); 238 239 spin_lock_irqsave(&vhci->lock, flags); 240 if (!HCD_HW_ACCESSIBLE(hcd)) { 241 usbip_dbg_vhci_rh("hw accessible flag not on?\n"); 242 goto done; 243 } 244 245 /* check pseudo status register for each port */ 246 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 247 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) { 248 /* The status of a port has been changed, */ 249 usbip_dbg_vhci_rh("port %d status changed\n", rhport); 250 251 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8; 252 changed = 1; 253 } 254 } 255 256 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1)) 257 usb_hcd_resume_root_hub(hcd); 258 259 done: 260 spin_unlock_irqrestore(&vhci->lock, flags); 261 return changed ? retval : 0; 262 } 263 264 /* usb 3.0 root hub device descriptor */ 265 static struct { 266 struct usb_bos_descriptor bos; 267 struct usb_ss_cap_descriptor ss_cap; 268 } __packed usb3_bos_desc = { 269 270 .bos = { 271 .bLength = USB_DT_BOS_SIZE, 272 .bDescriptorType = USB_DT_BOS, 273 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 274 .bNumDeviceCaps = 1, 275 }, 276 .ss_cap = { 277 .bLength = USB_DT_USB_SS_CAP_SIZE, 278 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 279 .bDevCapabilityType = USB_SS_CAP_TYPE, 280 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 281 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 282 }, 283 }; 284 285 static inline void 286 ss_hub_descriptor(struct usb_hub_descriptor *desc) 287 { 288 memset(desc, 0, sizeof *desc); 289 desc->bDescriptorType = USB_DT_SS_HUB; 290 desc->bDescLength = 12; 291 desc->wHubCharacteristics = cpu_to_le16( 292 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM); 293 desc->bNbrPorts = VHCI_HC_PORTS; 294 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 295 desc->u.ss.DeviceRemovable = 0xffff; 296 } 297 298 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 299 { 300 int width; 301 302 memset(desc, 0, sizeof(*desc)); 303 desc->bDescriptorType = USB_DT_HUB; 304 desc->wHubCharacteristics = cpu_to_le16( 305 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM); 306 307 desc->bNbrPorts = VHCI_HC_PORTS; 308 BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN); 309 width = desc->bNbrPorts / 8 + 1; 310 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width; 311 memset(&desc->u.hs.DeviceRemovable[0], 0, width); 312 memset(&desc->u.hs.DeviceRemovable[width], 0xff, width); 313 } 314 315 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 316 u16 wIndex, char *buf, u16 wLength) 317 { 318 struct vhci_hcd *vhci_hcd; 319 struct vhci *vhci; 320 int retval = 0; 321 int rhport = -1; 322 unsigned long flags; 323 bool invalid_rhport = false; 324 325 u32 prev_port_status[VHCI_HC_PORTS]; 326 327 if (!HCD_HW_ACCESSIBLE(hcd)) 328 return -ETIMEDOUT; 329 330 /* 331 * NOTE: 332 * wIndex (bits 0-7) shows the port number and begins from 1? 333 */ 334 wIndex = ((__u8)(wIndex & 0x00ff)); 335 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue, 336 wIndex); 337 338 /* 339 * wIndex can be 0 for some request types (typeReq). rhport is 340 * in valid range when wIndex >= 1 and < VHCI_HC_PORTS. 341 * 342 * Reference port_status[] only with valid rhport when 343 * invalid_rhport is false. 344 */ 345 if (wIndex < 1 || wIndex > VHCI_HC_PORTS) { 346 invalid_rhport = true; 347 if (wIndex > VHCI_HC_PORTS) 348 pr_err("invalid port number %d\n", wIndex); 349 } else 350 rhport = wIndex - 1; 351 352 vhci_hcd = hcd_to_vhci_hcd(hcd); 353 vhci = vhci_hcd->vhci; 354 355 spin_lock_irqsave(&vhci->lock, flags); 356 357 /* store old status and compare now and old later */ 358 if (usbip_dbg_flag_vhci_rh) { 359 if (!invalid_rhport) 360 memcpy(prev_port_status, vhci_hcd->port_status, 361 sizeof(prev_port_status)); 362 } 363 364 switch (typeReq) { 365 case ClearHubFeature: 366 usbip_dbg_vhci_rh(" ClearHubFeature\n"); 367 break; 368 case ClearPortFeature: 369 if (invalid_rhport) { 370 pr_err("invalid port number %d\n", wIndex); 371 goto error; 372 } 373 switch (wValue) { 374 case USB_PORT_FEAT_SUSPEND: 375 if (hcd->speed == HCD_USB3) { 376 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not " 377 "supported for USB 3.0 roothub\n"); 378 goto error; 379 } 380 usbip_dbg_vhci_rh( 381 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n"); 382 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) { 383 /* 20msec signaling */ 384 vhci_hcd->resuming = 1; 385 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 386 } 387 break; 388 case USB_PORT_FEAT_POWER: 389 usbip_dbg_vhci_rh( 390 " ClearPortFeature: USB_PORT_FEAT_POWER\n"); 391 if (hcd->speed == HCD_USB3) 392 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER; 393 else 394 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER; 395 break; 396 default: 397 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n", 398 wValue); 399 vhci_hcd->port_status[rhport] &= ~(1 << wValue); 400 break; 401 } 402 break; 403 case GetHubDescriptor: 404 usbip_dbg_vhci_rh(" GetHubDescriptor\n"); 405 if (hcd->speed == HCD_USB3 && 406 (wLength < USB_DT_SS_HUB_SIZE || 407 wValue != (USB_DT_SS_HUB << 8))) { 408 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n"); 409 goto error; 410 } 411 if (hcd->speed == HCD_USB3) 412 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 413 else 414 hub_descriptor((struct usb_hub_descriptor *) buf); 415 break; 416 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 417 if (hcd->speed != HCD_USB3) 418 goto error; 419 420 if ((wValue >> 8) != USB_DT_BOS) 421 goto error; 422 423 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 424 retval = sizeof(usb3_bos_desc); 425 break; 426 case GetHubStatus: 427 usbip_dbg_vhci_rh(" GetHubStatus\n"); 428 *(__le32 *) buf = cpu_to_le32(0); 429 break; 430 case GetPortStatus: 431 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex); 432 if (invalid_rhport) { 433 pr_err("invalid port number %d\n", wIndex); 434 retval = -EPIPE; 435 goto error; 436 } 437 438 /* we do not care about resume. */ 439 440 /* whoever resets or resumes must GetPortStatus to 441 * complete it!! 442 */ 443 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) { 444 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND); 445 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND); 446 vhci_hcd->resuming = 0; 447 vhci_hcd->re_timeout = 0; 448 } 449 450 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) != 451 0 && time_after(jiffies, vhci_hcd->re_timeout)) { 452 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET); 453 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET); 454 vhci_hcd->re_timeout = 0; 455 456 if (vhci_hcd->vdev[rhport].ud.status == 457 VDEV_ST_NOTASSIGNED) { 458 usbip_dbg_vhci_rh( 459 " enable rhport %d (status %u)\n", 460 rhport, 461 vhci_hcd->vdev[rhport].ud.status); 462 vhci_hcd->port_status[rhport] |= 463 USB_PORT_STAT_ENABLE; 464 } 465 466 if (hcd->speed < HCD_USB3) { 467 switch (vhci_hcd->vdev[rhport].speed) { 468 case USB_SPEED_HIGH: 469 vhci_hcd->port_status[rhport] |= 470 USB_PORT_STAT_HIGH_SPEED; 471 break; 472 case USB_SPEED_LOW: 473 vhci_hcd->port_status[rhport] |= 474 USB_PORT_STAT_LOW_SPEED; 475 break; 476 default: 477 pr_err("vhci_device speed not set\n"); 478 break; 479 } 480 } 481 } 482 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]); 483 ((__le16 *) buf)[1] = 484 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16); 485 486 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0], 487 ((u16 *)buf)[1]); 488 break; 489 case SetHubFeature: 490 usbip_dbg_vhci_rh(" SetHubFeature\n"); 491 retval = -EPIPE; 492 break; 493 case SetPortFeature: 494 switch (wValue) { 495 case USB_PORT_FEAT_LINK_STATE: 496 usbip_dbg_vhci_rh( 497 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n"); 498 if (hcd->speed != HCD_USB3) { 499 pr_err("USB_PORT_FEAT_LINK_STATE req not " 500 "supported for USB 2.0 roothub\n"); 501 goto error; 502 } 503 /* 504 * Since this is dummy we don't have an actual link so 505 * there is nothing to do for the SET_LINK_STATE cmd 506 */ 507 break; 508 case USB_PORT_FEAT_U1_TIMEOUT: 509 usbip_dbg_vhci_rh( 510 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n"); 511 case USB_PORT_FEAT_U2_TIMEOUT: 512 usbip_dbg_vhci_rh( 513 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n"); 514 /* TODO: add suspend/resume support! */ 515 if (hcd->speed != HCD_USB3) { 516 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not " 517 "supported for USB 2.0 roothub\n"); 518 goto error; 519 } 520 break; 521 case USB_PORT_FEAT_SUSPEND: 522 usbip_dbg_vhci_rh( 523 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n"); 524 /* Applicable only for USB2.0 hub */ 525 if (hcd->speed == HCD_USB3) { 526 pr_err("USB_PORT_FEAT_SUSPEND req not " 527 "supported for USB 3.0 roothub\n"); 528 goto error; 529 } 530 531 if (invalid_rhport) { 532 pr_err("invalid port number %d\n", wIndex); 533 goto error; 534 } 535 536 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND; 537 break; 538 case USB_PORT_FEAT_POWER: 539 usbip_dbg_vhci_rh( 540 " SetPortFeature: USB_PORT_FEAT_POWER\n"); 541 if (invalid_rhport) { 542 pr_err("invalid port number %d\n", wIndex); 543 goto error; 544 } 545 if (hcd->speed == HCD_USB3) 546 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER; 547 else 548 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER; 549 break; 550 case USB_PORT_FEAT_BH_PORT_RESET: 551 usbip_dbg_vhci_rh( 552 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n"); 553 if (invalid_rhport) { 554 pr_err("invalid port number %d\n", wIndex); 555 goto error; 556 } 557 /* Applicable only for USB3.0 hub */ 558 if (hcd->speed != HCD_USB3) { 559 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not " 560 "supported for USB 2.0 roothub\n"); 561 goto error; 562 } 563 /* FALLS THROUGH */ 564 case USB_PORT_FEAT_RESET: 565 usbip_dbg_vhci_rh( 566 " SetPortFeature: USB_PORT_FEAT_RESET\n"); 567 if (invalid_rhport) { 568 pr_err("invalid port number %d\n", wIndex); 569 goto error; 570 } 571 /* if it's already enabled, disable */ 572 if (hcd->speed == HCD_USB3) { 573 vhci_hcd->port_status[rhport] = 0; 574 vhci_hcd->port_status[rhport] = 575 (USB_SS_PORT_STAT_POWER | 576 USB_PORT_STAT_CONNECTION | 577 USB_PORT_STAT_RESET); 578 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) { 579 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE 580 | USB_PORT_STAT_LOW_SPEED 581 | USB_PORT_STAT_HIGH_SPEED); 582 } 583 584 /* 50msec reset signaling */ 585 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 586 587 /* FALLS THROUGH */ 588 default: 589 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n", 590 wValue); 591 if (invalid_rhport) { 592 pr_err("invalid port number %d\n", wIndex); 593 goto error; 594 } 595 if (hcd->speed == HCD_USB3) { 596 if ((vhci_hcd->port_status[rhport] & 597 USB_SS_PORT_STAT_POWER) != 0) { 598 vhci_hcd->port_status[rhport] |= (1 << wValue); 599 } 600 } else 601 if ((vhci_hcd->port_status[rhport] & 602 USB_PORT_STAT_POWER) != 0) { 603 vhci_hcd->port_status[rhport] |= (1 << wValue); 604 } 605 } 606 break; 607 case GetPortErrorCount: 608 usbip_dbg_vhci_rh(" GetPortErrorCount\n"); 609 if (hcd->speed != HCD_USB3) { 610 pr_err("GetPortErrorCount req not " 611 "supported for USB 2.0 roothub\n"); 612 goto error; 613 } 614 /* We'll always return 0 since this is a dummy hub */ 615 *(__le32 *) buf = cpu_to_le32(0); 616 break; 617 case SetHubDepth: 618 usbip_dbg_vhci_rh(" SetHubDepth\n"); 619 if (hcd->speed != HCD_USB3) { 620 pr_err("SetHubDepth req not supported for " 621 "USB 2.0 roothub\n"); 622 goto error; 623 } 624 break; 625 default: 626 pr_err("default hub control req: %04x v%04x i%04x l%d\n", 627 typeReq, wValue, wIndex, wLength); 628 error: 629 /* "protocol stall" on error */ 630 retval = -EPIPE; 631 } 632 633 if (usbip_dbg_flag_vhci_rh) { 634 pr_debug("port %d\n", rhport); 635 /* Only dump valid port status */ 636 if (!invalid_rhport) { 637 dump_port_status_diff(prev_port_status[rhport], 638 vhci_hcd->port_status[rhport], 639 hcd->speed == HCD_USB3); 640 } 641 } 642 usbip_dbg_vhci_rh(" bye\n"); 643 644 spin_unlock_irqrestore(&vhci->lock, flags); 645 646 if (!invalid_rhport && 647 (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) { 648 usb_hcd_poll_rh_status(hcd); 649 } 650 651 return retval; 652 } 653 654 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev) 655 { 656 struct vhci_priv *priv; 657 struct vhci_hcd *vhci_hcd; 658 unsigned long flags; 659 660 if (!vdev) { 661 pr_err("could not get virtual device"); 662 return; 663 } 664 vhci_hcd = vdev_to_vhci_hcd(vdev); 665 666 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC); 667 if (!priv) { 668 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 669 return; 670 } 671 672 spin_lock_irqsave(&vdev->priv_lock, flags); 673 674 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 675 if (priv->seqnum == 0xffff) 676 dev_info(&urb->dev->dev, "seqnum max\n"); 677 678 priv->vdev = vdev; 679 priv->urb = urb; 680 681 urb->hcpriv = (void *) priv; 682 683 list_add_tail(&priv->list, &vdev->priv_tx); 684 685 wake_up(&vdev->waitq_tx); 686 spin_unlock_irqrestore(&vdev->priv_lock, flags); 687 } 688 689 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 690 { 691 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 692 struct vhci *vhci = vhci_hcd->vhci; 693 struct device *dev = &urb->dev->dev; 694 u8 portnum = urb->dev->portnum; 695 int ret = 0; 696 struct vhci_device *vdev; 697 unsigned long flags; 698 699 if (portnum > VHCI_HC_PORTS) { 700 pr_err("invalid port number %d\n", portnum); 701 return -ENODEV; 702 } 703 vdev = &vhci_hcd->vdev[portnum-1]; 704 705 if (!urb->transfer_buffer && urb->transfer_buffer_length) { 706 dev_dbg(dev, "Null URB transfer buffer\n"); 707 return -EINVAL; 708 } 709 710 spin_lock_irqsave(&vhci->lock, flags); 711 712 if (urb->status != -EINPROGRESS) { 713 dev_err(dev, "URB already unlinked!, status %d\n", urb->status); 714 spin_unlock_irqrestore(&vhci->lock, flags); 715 return urb->status; 716 } 717 718 /* refuse enqueue for dead connection */ 719 spin_lock(&vdev->ud.lock); 720 if (vdev->ud.status == VDEV_ST_NULL || 721 vdev->ud.status == VDEV_ST_ERROR) { 722 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport); 723 spin_unlock(&vdev->ud.lock); 724 spin_unlock_irqrestore(&vhci->lock, flags); 725 return -ENODEV; 726 } 727 spin_unlock(&vdev->ud.lock); 728 729 ret = usb_hcd_link_urb_to_ep(hcd, urb); 730 if (ret) 731 goto no_need_unlink; 732 733 /* 734 * The enumeration process is as follows; 735 * 736 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0) 737 * to get max packet length of default pipe 738 * 739 * 2. Set_Address request to DevAddr(0) EndPoint(0) 740 * 741 */ 742 if (usb_pipedevice(urb->pipe) == 0) { 743 __u8 type = usb_pipetype(urb->pipe); 744 struct usb_ctrlrequest *ctrlreq = 745 (struct usb_ctrlrequest *) urb->setup_packet; 746 747 if (type != PIPE_CONTROL || !ctrlreq) { 748 dev_err(dev, "invalid request to devnum 0\n"); 749 ret = -EINVAL; 750 goto no_need_xmit; 751 } 752 753 switch (ctrlreq->bRequest) { 754 case USB_REQ_SET_ADDRESS: 755 /* set_address may come when a device is reset */ 756 dev_info(dev, "SetAddress Request (%d) to port %d\n", 757 ctrlreq->wValue, vdev->rhport); 758 759 usb_put_dev(vdev->udev); 760 vdev->udev = usb_get_dev(urb->dev); 761 762 spin_lock(&vdev->ud.lock); 763 vdev->ud.status = VDEV_ST_USED; 764 spin_unlock(&vdev->ud.lock); 765 766 if (urb->status == -EINPROGRESS) { 767 /* This request is successfully completed. */ 768 /* If not -EINPROGRESS, possibly unlinked. */ 769 urb->status = 0; 770 } 771 772 goto no_need_xmit; 773 774 case USB_REQ_GET_DESCRIPTOR: 775 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8)) 776 usbip_dbg_vhci_hc( 777 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n"); 778 779 usb_put_dev(vdev->udev); 780 vdev->udev = usb_get_dev(urb->dev); 781 goto out; 782 783 default: 784 /* NOT REACHED */ 785 dev_err(dev, 786 "invalid request to devnum 0 bRequest %u, wValue %u\n", 787 ctrlreq->bRequest, 788 ctrlreq->wValue); 789 ret = -EINVAL; 790 goto no_need_xmit; 791 } 792 793 } 794 795 out: 796 vhci_tx_urb(urb, vdev); 797 spin_unlock_irqrestore(&vhci->lock, flags); 798 799 return 0; 800 801 no_need_xmit: 802 usb_hcd_unlink_urb_from_ep(hcd, urb); 803 no_need_unlink: 804 spin_unlock_irqrestore(&vhci->lock, flags); 805 if (!ret) 806 usb_hcd_giveback_urb(hcd, urb, urb->status); 807 return ret; 808 } 809 810 /* 811 * vhci_rx gives back the urb after receiving the reply of the urb. If an 812 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives 813 * back its urb. For the driver unlinking the urb, the content of the urb is 814 * not important, but the calling to its completion handler is important; the 815 * completion of unlinking is notified by the completion handler. 816 * 817 * 818 * CLIENT SIDE 819 * 820 * - When vhci_hcd receives RET_SUBMIT, 821 * 822 * - case 1a). the urb of the pdu is not unlinking. 823 * - normal case 824 * => just give back the urb 825 * 826 * - case 1b). the urb of the pdu is unlinking. 827 * - usbip.ko will return a reply of the unlinking request. 828 * => give back the urb now and go to case 2b). 829 * 830 * - When vhci_hcd receives RET_UNLINK, 831 * 832 * - case 2a). a submit request is still pending in vhci_hcd. 833 * - urb was really pending in usbip.ko and urb_unlink_urb() was 834 * completed there. 835 * => free a pending submit request 836 * => notify unlink completeness by giving back the urb 837 * 838 * - case 2b). a submit request is *not* pending in vhci_hcd. 839 * - urb was already given back to the core driver. 840 * => do not give back the urb 841 * 842 * 843 * SERVER SIDE 844 * 845 * - When usbip receives CMD_UNLINK, 846 * 847 * - case 3a). the urb of the unlink request is now in submission. 848 * => do usb_unlink_urb(). 849 * => after the unlink is completed, send RET_UNLINK. 850 * 851 * - case 3b). the urb of the unlink request is not in submission. 852 * - may be already completed or never be received 853 * => send RET_UNLINK 854 * 855 */ 856 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 857 { 858 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 859 struct vhci *vhci = vhci_hcd->vhci; 860 struct vhci_priv *priv; 861 struct vhci_device *vdev; 862 unsigned long flags; 863 864 spin_lock_irqsave(&vhci->lock, flags); 865 866 priv = urb->hcpriv; 867 if (!priv) { 868 /* URB was never linked! or will be soon given back by 869 * vhci_rx. */ 870 spin_unlock_irqrestore(&vhci->lock, flags); 871 return -EIDRM; 872 } 873 874 { 875 int ret = 0; 876 877 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 878 if (ret) { 879 spin_unlock_irqrestore(&vhci->lock, flags); 880 return ret; 881 } 882 } 883 884 /* send unlink request here? */ 885 vdev = priv->vdev; 886 887 if (!vdev->ud.tcp_socket) { 888 /* tcp connection is closed */ 889 spin_lock(&vdev->priv_lock); 890 891 list_del(&priv->list); 892 kfree(priv); 893 urb->hcpriv = NULL; 894 895 spin_unlock(&vdev->priv_lock); 896 897 /* 898 * If tcp connection is alive, we have sent CMD_UNLINK. 899 * vhci_rx will receive RET_UNLINK and give back the URB. 900 * Otherwise, we give back it here. 901 */ 902 usb_hcd_unlink_urb_from_ep(hcd, urb); 903 904 spin_unlock_irqrestore(&vhci->lock, flags); 905 usb_hcd_giveback_urb(hcd, urb, urb->status); 906 spin_lock_irqsave(&vhci->lock, flags); 907 908 } else { 909 /* tcp connection is alive */ 910 struct vhci_unlink *unlink; 911 912 spin_lock(&vdev->priv_lock); 913 914 /* setup CMD_UNLINK pdu */ 915 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC); 916 if (!unlink) { 917 spin_unlock(&vdev->priv_lock); 918 spin_unlock_irqrestore(&vhci->lock, flags); 919 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 920 return -ENOMEM; 921 } 922 923 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 924 if (unlink->seqnum == 0xffff) 925 pr_info("seqnum max\n"); 926 927 unlink->unlink_seqnum = priv->seqnum; 928 929 /* send cmd_unlink and try to cancel the pending URB in the 930 * peer */ 931 list_add_tail(&unlink->list, &vdev->unlink_tx); 932 wake_up(&vdev->waitq_tx); 933 934 spin_unlock(&vdev->priv_lock); 935 } 936 937 spin_unlock_irqrestore(&vhci->lock, flags); 938 939 usbip_dbg_vhci_hc("leave\n"); 940 return 0; 941 } 942 943 static void vhci_device_unlink_cleanup(struct vhci_device *vdev) 944 { 945 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 946 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd); 947 struct vhci *vhci = vhci_hcd->vhci; 948 struct vhci_unlink *unlink, *tmp; 949 unsigned long flags; 950 951 spin_lock_irqsave(&vhci->lock, flags); 952 spin_lock(&vdev->priv_lock); 953 954 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { 955 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); 956 list_del(&unlink->list); 957 kfree(unlink); 958 } 959 960 while (!list_empty(&vdev->unlink_rx)) { 961 struct urb *urb; 962 963 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink, 964 list); 965 966 /* give back URB of unanswered unlink request */ 967 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum); 968 969 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); 970 if (!urb) { 971 pr_info("the urb (seqnum %lu) was already given back\n", 972 unlink->unlink_seqnum); 973 list_del(&unlink->list); 974 kfree(unlink); 975 continue; 976 } 977 978 urb->status = -ENODEV; 979 980 usb_hcd_unlink_urb_from_ep(hcd, urb); 981 982 list_del(&unlink->list); 983 984 spin_unlock(&vdev->priv_lock); 985 spin_unlock_irqrestore(&vhci->lock, flags); 986 987 usb_hcd_giveback_urb(hcd, urb, urb->status); 988 989 spin_lock_irqsave(&vhci->lock, flags); 990 spin_lock(&vdev->priv_lock); 991 992 kfree(unlink); 993 } 994 995 spin_unlock(&vdev->priv_lock); 996 spin_unlock_irqrestore(&vhci->lock, flags); 997 } 998 999 /* 1000 * The important thing is that only one context begins cleanup. 1001 * This is why error handling and cleanup become simple. 1002 * We do not want to consider race condition as possible. 1003 */ 1004 static void vhci_shutdown_connection(struct usbip_device *ud) 1005 { 1006 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1007 1008 /* need this? see stub_dev.c */ 1009 if (ud->tcp_socket) { 1010 pr_debug("shutdown tcp_socket %d\n", ud->sockfd); 1011 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); 1012 } 1013 1014 /* kill threads related to this sdev */ 1015 if (vdev->ud.tcp_rx) { 1016 kthread_stop_put(vdev->ud.tcp_rx); 1017 vdev->ud.tcp_rx = NULL; 1018 } 1019 if (vdev->ud.tcp_tx) { 1020 kthread_stop_put(vdev->ud.tcp_tx); 1021 vdev->ud.tcp_tx = NULL; 1022 } 1023 pr_info("stop threads\n"); 1024 1025 /* active connection is closed */ 1026 if (vdev->ud.tcp_socket) { 1027 sockfd_put(vdev->ud.tcp_socket); 1028 vdev->ud.tcp_socket = NULL; 1029 vdev->ud.sockfd = -1; 1030 } 1031 pr_info("release socket\n"); 1032 1033 vhci_device_unlink_cleanup(vdev); 1034 1035 /* 1036 * rh_port_disconnect() is a trigger of ... 1037 * usb_disable_device(): 1038 * disable all the endpoints for a USB device. 1039 * usb_disable_endpoint(): 1040 * disable endpoints. pending urbs are unlinked(dequeued). 1041 * 1042 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a 1043 * detached device should release used urbs in a cleanup function (i.e. 1044 * xxx_disconnect()). Therefore, vhci_hcd does not need to release 1045 * pushed urbs and their private data in this function. 1046 * 1047 * NOTE: vhci_dequeue() must be considered carefully. When shutting down 1048 * a connection, vhci_shutdown_connection() expects vhci_dequeue() 1049 * gives back pushed urbs and frees their private data by request of 1050 * the cleanup function of a USB driver. When unlinking a urb with an 1051 * active connection, vhci_dequeue() does not give back the urb which 1052 * is actually given back by vhci_rx after receiving its return pdu. 1053 * 1054 */ 1055 rh_port_disconnect(vdev); 1056 1057 pr_info("disconnect device\n"); 1058 } 1059 1060 static void vhci_device_reset(struct usbip_device *ud) 1061 { 1062 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1063 unsigned long flags; 1064 1065 spin_lock_irqsave(&ud->lock, flags); 1066 1067 vdev->speed = 0; 1068 vdev->devid = 0; 1069 1070 usb_put_dev(vdev->udev); 1071 vdev->udev = NULL; 1072 1073 if (ud->tcp_socket) { 1074 sockfd_put(ud->tcp_socket); 1075 ud->tcp_socket = NULL; 1076 ud->sockfd = -1; 1077 } 1078 ud->status = VDEV_ST_NULL; 1079 1080 spin_unlock_irqrestore(&ud->lock, flags); 1081 } 1082 1083 static void vhci_device_unusable(struct usbip_device *ud) 1084 { 1085 unsigned long flags; 1086 1087 spin_lock_irqsave(&ud->lock, flags); 1088 ud->status = VDEV_ST_ERROR; 1089 spin_unlock_irqrestore(&ud->lock, flags); 1090 } 1091 1092 static void vhci_device_init(struct vhci_device *vdev) 1093 { 1094 memset(vdev, 0, sizeof(struct vhci_device)); 1095 1096 vdev->ud.side = USBIP_VHCI; 1097 vdev->ud.status = VDEV_ST_NULL; 1098 spin_lock_init(&vdev->ud.lock); 1099 1100 INIT_LIST_HEAD(&vdev->priv_rx); 1101 INIT_LIST_HEAD(&vdev->priv_tx); 1102 INIT_LIST_HEAD(&vdev->unlink_tx); 1103 INIT_LIST_HEAD(&vdev->unlink_rx); 1104 spin_lock_init(&vdev->priv_lock); 1105 1106 init_waitqueue_head(&vdev->waitq_tx); 1107 1108 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection; 1109 vdev->ud.eh_ops.reset = vhci_device_reset; 1110 vdev->ud.eh_ops.unusable = vhci_device_unusable; 1111 1112 usbip_start_eh(&vdev->ud); 1113 } 1114 1115 static int hcd_name_to_id(const char *name) 1116 { 1117 char *c; 1118 long val; 1119 int ret; 1120 1121 c = strchr(name, '.'); 1122 if (c == NULL) 1123 return 0; 1124 1125 ret = kstrtol(c+1, 10, &val); 1126 if (ret < 0) 1127 return ret; 1128 1129 return val; 1130 } 1131 1132 static int vhci_setup(struct usb_hcd *hcd) 1133 { 1134 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1135 if (usb_hcd_is_primary_hcd(hcd)) { 1136 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd); 1137 vhci->vhci_hcd_hs->vhci = vhci; 1138 /* 1139 * Mark the first roothub as being USB 2.0. 1140 * The USB 3.0 roothub will be registered later by 1141 * vhci_hcd_probe() 1142 */ 1143 hcd->speed = HCD_USB2; 1144 hcd->self.root_hub->speed = USB_SPEED_HIGH; 1145 } else { 1146 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd); 1147 vhci->vhci_hcd_ss->vhci = vhci; 1148 hcd->speed = HCD_USB3; 1149 hcd->self.root_hub->speed = USB_SPEED_SUPER; 1150 } 1151 return 0; 1152 } 1153 1154 static int vhci_start(struct usb_hcd *hcd) 1155 { 1156 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1157 int id, rhport; 1158 int err; 1159 1160 usbip_dbg_vhci_hc("enter vhci_start\n"); 1161 1162 if (usb_hcd_is_primary_hcd(hcd)) 1163 spin_lock_init(&vhci_hcd->vhci->lock); 1164 1165 /* initialize private data of usb_hcd */ 1166 1167 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1168 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1169 1170 vhci_device_init(vdev); 1171 vdev->rhport = rhport; 1172 } 1173 1174 atomic_set(&vhci_hcd->seqnum, 0); 1175 1176 hcd->power_budget = 0; /* no limit */ 1177 hcd->uses_new_polling = 1; 1178 1179 #ifdef CONFIG_USB_OTG 1180 hcd->self.otg_port = 1; 1181 #endif 1182 1183 id = hcd_name_to_id(hcd_name(hcd)); 1184 if (id < 0) { 1185 pr_err("invalid vhci name %s\n", hcd_name(hcd)); 1186 return -EINVAL; 1187 } 1188 1189 /* vhci_hcd is now ready to be controlled through sysfs */ 1190 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1191 err = vhci_init_attr_group(); 1192 if (err) { 1193 pr_err("init attr group\n"); 1194 return err; 1195 } 1196 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1197 if (err) { 1198 pr_err("create sysfs files\n"); 1199 vhci_finish_attr_group(); 1200 return err; 1201 } 1202 pr_info("created sysfs %s\n", hcd_name(hcd)); 1203 } 1204 1205 return 0; 1206 } 1207 1208 static void vhci_stop(struct usb_hcd *hcd) 1209 { 1210 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1211 int id, rhport; 1212 1213 usbip_dbg_vhci_hc("stop VHCI controller\n"); 1214 1215 /* 1. remove the userland interface of vhci_hcd */ 1216 id = hcd_name_to_id(hcd_name(hcd)); 1217 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1218 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1219 vhci_finish_attr_group(); 1220 } 1221 1222 /* 2. shutdown all the ports of vhci_hcd */ 1223 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1224 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1225 1226 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED); 1227 usbip_stop_eh(&vdev->ud); 1228 } 1229 } 1230 1231 static int vhci_get_frame_number(struct usb_hcd *hcd) 1232 { 1233 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n"); 1234 return 0; 1235 } 1236 1237 #ifdef CONFIG_PM 1238 1239 /* FIXME: suspend/resume */ 1240 static int vhci_bus_suspend(struct usb_hcd *hcd) 1241 { 1242 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1243 unsigned long flags; 1244 1245 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1246 1247 spin_lock_irqsave(&vhci->lock, flags); 1248 hcd->state = HC_STATE_SUSPENDED; 1249 spin_unlock_irqrestore(&vhci->lock, flags); 1250 1251 return 0; 1252 } 1253 1254 static int vhci_bus_resume(struct usb_hcd *hcd) 1255 { 1256 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1257 int rc = 0; 1258 unsigned long flags; 1259 1260 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1261 1262 spin_lock_irqsave(&vhci->lock, flags); 1263 if (!HCD_HW_ACCESSIBLE(hcd)) 1264 rc = -ESHUTDOWN; 1265 else 1266 hcd->state = HC_STATE_RUNNING; 1267 spin_unlock_irqrestore(&vhci->lock, flags); 1268 1269 return rc; 1270 } 1271 1272 #else 1273 1274 #define vhci_bus_suspend NULL 1275 #define vhci_bus_resume NULL 1276 #endif 1277 1278 /* Change a group of bulk endpoints to support multiple stream IDs */ 1279 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 1280 struct usb_host_endpoint **eps, unsigned int num_eps, 1281 unsigned int num_streams, gfp_t mem_flags) 1282 { 1283 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n"); 1284 return 0; 1285 } 1286 1287 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 1288 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 1289 struct usb_host_endpoint **eps, unsigned int num_eps, 1290 gfp_t mem_flags) 1291 { 1292 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n"); 1293 return 0; 1294 } 1295 1296 static const struct hc_driver vhci_hc_driver = { 1297 .description = driver_name, 1298 .product_desc = driver_desc, 1299 .hcd_priv_size = sizeof(struct vhci_hcd), 1300 1301 .flags = HCD_USB3 | HCD_SHARED, 1302 1303 .reset = vhci_setup, 1304 .start = vhci_start, 1305 .stop = vhci_stop, 1306 1307 .urb_enqueue = vhci_urb_enqueue, 1308 .urb_dequeue = vhci_urb_dequeue, 1309 1310 .get_frame_number = vhci_get_frame_number, 1311 1312 .hub_status_data = vhci_hub_status, 1313 .hub_control = vhci_hub_control, 1314 .bus_suspend = vhci_bus_suspend, 1315 .bus_resume = vhci_bus_resume, 1316 1317 .alloc_streams = vhci_alloc_streams, 1318 .free_streams = vhci_free_streams, 1319 }; 1320 1321 static int vhci_hcd_probe(struct platform_device *pdev) 1322 { 1323 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1324 struct usb_hcd *hcd_hs; 1325 struct usb_hcd *hcd_ss; 1326 int ret; 1327 1328 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id); 1329 1330 /* 1331 * Allocate and initialize hcd. 1332 * Our private data is also allocated automatically. 1333 */ 1334 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); 1335 if (!hcd_hs) { 1336 pr_err("create primary hcd failed\n"); 1337 return -ENOMEM; 1338 } 1339 hcd_hs->has_tt = 1; 1340 1341 /* 1342 * Finish generic HCD structure initialization and register. 1343 * Call the driver's reset() and start() routines. 1344 */ 1345 ret = usb_add_hcd(hcd_hs, 0, 0); 1346 if (ret != 0) { 1347 pr_err("usb_add_hcd hs failed %d\n", ret); 1348 goto put_usb2_hcd; 1349 } 1350 1351 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev, 1352 dev_name(&pdev->dev), hcd_hs); 1353 if (!hcd_ss) { 1354 ret = -ENOMEM; 1355 pr_err("create shared hcd failed\n"); 1356 goto remove_usb2_hcd; 1357 } 1358 1359 ret = usb_add_hcd(hcd_ss, 0, 0); 1360 if (ret) { 1361 pr_err("usb_add_hcd ss failed %d\n", ret); 1362 goto put_usb3_hcd; 1363 } 1364 1365 usbip_dbg_vhci_hc("bye\n"); 1366 return 0; 1367 1368 put_usb3_hcd: 1369 usb_put_hcd(hcd_ss); 1370 remove_usb2_hcd: 1371 usb_remove_hcd(hcd_hs); 1372 put_usb2_hcd: 1373 usb_put_hcd(hcd_hs); 1374 vhci->vhci_hcd_hs = NULL; 1375 vhci->vhci_hcd_ss = NULL; 1376 return ret; 1377 } 1378 1379 static int vhci_hcd_remove(struct platform_device *pdev) 1380 { 1381 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1382 1383 /* 1384 * Disconnects the root hub, 1385 * then reverses the effects of usb_add_hcd(), 1386 * invoking the HCD's stop() methods. 1387 */ 1388 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1389 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1390 1391 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1392 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1393 1394 vhci->vhci_hcd_hs = NULL; 1395 vhci->vhci_hcd_ss = NULL; 1396 1397 return 0; 1398 } 1399 1400 #ifdef CONFIG_PM 1401 1402 /* what should happen for USB/IP under suspend/resume? */ 1403 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state) 1404 { 1405 struct usb_hcd *hcd; 1406 struct vhci *vhci; 1407 int rhport; 1408 int connected = 0; 1409 int ret = 0; 1410 unsigned long flags; 1411 1412 dev_dbg(&pdev->dev, "%s\n", __func__); 1413 1414 hcd = platform_get_drvdata(pdev); 1415 if (!hcd) 1416 return 0; 1417 1418 vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1419 1420 spin_lock_irqsave(&vhci->lock, flags); 1421 1422 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1423 if (vhci->vhci_hcd_hs->port_status[rhport] & 1424 USB_PORT_STAT_CONNECTION) 1425 connected += 1; 1426 1427 if (vhci->vhci_hcd_ss->port_status[rhport] & 1428 USB_PORT_STAT_CONNECTION) 1429 connected += 1; 1430 } 1431 1432 spin_unlock_irqrestore(&vhci->lock, flags); 1433 1434 if (connected > 0) { 1435 dev_info(&pdev->dev, 1436 "We have %d active connection%s. Do not suspend.\n", 1437 connected, (connected == 1 ? "" : "s")); 1438 ret = -EBUSY; 1439 } else { 1440 dev_info(&pdev->dev, "suspend vhci_hcd"); 1441 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1442 } 1443 1444 return ret; 1445 } 1446 1447 static int vhci_hcd_resume(struct platform_device *pdev) 1448 { 1449 struct usb_hcd *hcd; 1450 1451 dev_dbg(&pdev->dev, "%s\n", __func__); 1452 1453 hcd = platform_get_drvdata(pdev); 1454 if (!hcd) 1455 return 0; 1456 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1457 usb_hcd_poll_rh_status(hcd); 1458 1459 return 0; 1460 } 1461 1462 #else 1463 1464 #define vhci_hcd_suspend NULL 1465 #define vhci_hcd_resume NULL 1466 1467 #endif 1468 1469 static struct platform_driver vhci_driver = { 1470 .probe = vhci_hcd_probe, 1471 .remove = vhci_hcd_remove, 1472 .suspend = vhci_hcd_suspend, 1473 .resume = vhci_hcd_resume, 1474 .driver = { 1475 .name = driver_name, 1476 }, 1477 }; 1478 1479 static void del_platform_devices(void) 1480 { 1481 struct platform_device *pdev; 1482 int i; 1483 1484 for (i = 0; i < vhci_num_controllers; i++) { 1485 pdev = vhcis[i].pdev; 1486 if (pdev != NULL) 1487 platform_device_unregister(pdev); 1488 vhcis[i].pdev = NULL; 1489 } 1490 sysfs_remove_link(&platform_bus.kobj, driver_name); 1491 } 1492 1493 static int __init vhci_hcd_init(void) 1494 { 1495 int i, ret; 1496 1497 if (usb_disabled()) 1498 return -ENODEV; 1499 1500 if (vhci_num_controllers < 1) 1501 vhci_num_controllers = 1; 1502 1503 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL); 1504 if (vhcis == NULL) 1505 return -ENOMEM; 1506 1507 for (i = 0; i < vhci_num_controllers; i++) { 1508 vhcis[i].pdev = platform_device_alloc(driver_name, i); 1509 if (!vhcis[i].pdev) { 1510 i--; 1511 while (i >= 0) 1512 platform_device_put(vhcis[i--].pdev); 1513 ret = -ENOMEM; 1514 goto err_device_alloc; 1515 } 1516 } 1517 for (i = 0; i < vhci_num_controllers; i++) { 1518 void *vhci = &vhcis[i]; 1519 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *)); 1520 if (ret) 1521 goto err_driver_register; 1522 } 1523 1524 ret = platform_driver_register(&vhci_driver); 1525 if (ret) 1526 goto err_driver_register; 1527 1528 for (i = 0; i < vhci_num_controllers; i++) { 1529 ret = platform_device_add(vhcis[i].pdev); 1530 if (ret < 0) { 1531 i--; 1532 while (i >= 0) 1533 platform_device_del(vhcis[i--].pdev); 1534 goto err_add_hcd; 1535 } 1536 } 1537 1538 return ret; 1539 1540 err_add_hcd: 1541 platform_driver_unregister(&vhci_driver); 1542 err_driver_register: 1543 for (i = 0; i < vhci_num_controllers; i++) 1544 platform_device_put(vhcis[i].pdev); 1545 err_device_alloc: 1546 kfree(vhcis); 1547 return ret; 1548 } 1549 1550 static void __exit vhci_hcd_exit(void) 1551 { 1552 del_platform_devices(); 1553 platform_driver_unregister(&vhci_driver); 1554 kfree(vhcis); 1555 } 1556 1557 module_init(vhci_hcd_init); 1558 module_exit(vhci_hcd_exit); 1559 1560 MODULE_AUTHOR(DRIVER_AUTHOR); 1561 MODULE_DESCRIPTION(DRIVER_DESC); 1562 MODULE_LICENSE("GPL"); 1563