1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2003-2008 Takahiro Hirofuchi 4 * Copyright (C) 2015-2016 Nobuo Iwata 5 */ 6 7 #include <linux/init.h> 8 #include <linux/file.h> 9 #include <linux/kernel.h> 10 #include <linux/kthread.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/slab.h> 14 15 #include "usbip_common.h" 16 #include "vhci.h" 17 18 #define DRIVER_AUTHOR "Takahiro Hirofuchi" 19 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver" 20 21 /* 22 * TODO 23 * - update root hub emulation 24 * - move the emulation code to userland ? 25 * porting to other operating systems 26 * minimize kernel code 27 * - add suspend/resume code 28 * - clean up everything 29 */ 30 31 /* See usb gadget dummy hcd */ 32 33 static int vhci_hub_status(struct usb_hcd *hcd, char *buff); 34 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 35 u16 wIndex, char *buff, u16 wLength); 36 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, 37 gfp_t mem_flags); 38 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status); 39 static int vhci_start(struct usb_hcd *vhci_hcd); 40 static void vhci_stop(struct usb_hcd *hcd); 41 static int vhci_get_frame_number(struct usb_hcd *hcd); 42 43 static const char driver_name[] = "vhci_hcd"; 44 static const char driver_desc[] = "USB/IP Virtual Host Controller"; 45 46 int vhci_num_controllers = VHCI_NR_HCS; 47 struct vhci *vhcis; 48 49 static const char * const bit_desc[] = { 50 "CONNECTION", /*0*/ 51 "ENABLE", /*1*/ 52 "SUSPEND", /*2*/ 53 "OVER_CURRENT", /*3*/ 54 "RESET", /*4*/ 55 "L1", /*5*/ 56 "R6", /*6*/ 57 "R7", /*7*/ 58 "POWER", /*8*/ 59 "LOWSPEED", /*9*/ 60 "HIGHSPEED", /*10*/ 61 "PORT_TEST", /*11*/ 62 "INDICATOR", /*12*/ 63 "R13", /*13*/ 64 "R14", /*14*/ 65 "R15", /*15*/ 66 "C_CONNECTION", /*16*/ 67 "C_ENABLE", /*17*/ 68 "C_SUSPEND", /*18*/ 69 "C_OVER_CURRENT", /*19*/ 70 "C_RESET", /*20*/ 71 "C_L1", /*21*/ 72 "R22", /*22*/ 73 "R23", /*23*/ 74 "R24", /*24*/ 75 "R25", /*25*/ 76 "R26", /*26*/ 77 "R27", /*27*/ 78 "R28", /*28*/ 79 "R29", /*29*/ 80 "R30", /*30*/ 81 "R31", /*31*/ 82 }; 83 84 static const char * const bit_desc_ss[] = { 85 "CONNECTION", /*0*/ 86 "ENABLE", /*1*/ 87 "SUSPEND", /*2*/ 88 "OVER_CURRENT", /*3*/ 89 "RESET", /*4*/ 90 "L1", /*5*/ 91 "R6", /*6*/ 92 "R7", /*7*/ 93 "R8", /*8*/ 94 "POWER", /*9*/ 95 "HIGHSPEED", /*10*/ 96 "PORT_TEST", /*11*/ 97 "INDICATOR", /*12*/ 98 "R13", /*13*/ 99 "R14", /*14*/ 100 "R15", /*15*/ 101 "C_CONNECTION", /*16*/ 102 "C_ENABLE", /*17*/ 103 "C_SUSPEND", /*18*/ 104 "C_OVER_CURRENT", /*19*/ 105 "C_RESET", /*20*/ 106 "C_BH_RESET", /*21*/ 107 "C_LINK_STATE", /*22*/ 108 "C_CONFIG_ERROR", /*23*/ 109 "R24", /*24*/ 110 "R25", /*25*/ 111 "R26", /*26*/ 112 "R27", /*27*/ 113 "R28", /*28*/ 114 "R29", /*29*/ 115 "R30", /*30*/ 116 "R31", /*31*/ 117 }; 118 119 static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3) 120 { 121 int i = 0; 122 u32 bit = 1; 123 const char * const *desc = bit_desc; 124 125 if (usb3) 126 desc = bit_desc_ss; 127 128 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status); 129 while (bit) { 130 u32 prev = prev_status & bit; 131 u32 new = new_status & bit; 132 char change; 133 134 if (!prev && new) 135 change = '+'; 136 else if (prev && !new) 137 change = '-'; 138 else 139 change = ' '; 140 141 if (prev || new) { 142 pr_debug(" %c%s\n", change, desc[i]); 143 144 if (bit == 1) /* USB_PORT_STAT_CONNECTION */ 145 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS"); 146 } 147 bit <<= 1; 148 i++; 149 } 150 pr_debug("\n"); 151 } 152 153 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed) 154 { 155 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 156 struct vhci *vhci = vhci_hcd->vhci; 157 int rhport = vdev->rhport; 158 u32 status; 159 unsigned long flags; 160 161 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport); 162 163 spin_lock_irqsave(&vhci->lock, flags); 164 165 status = vhci_hcd->port_status[rhport]; 166 167 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION); 168 169 switch (speed) { 170 case USB_SPEED_HIGH: 171 status |= USB_PORT_STAT_HIGH_SPEED; 172 break; 173 case USB_SPEED_LOW: 174 status |= USB_PORT_STAT_LOW_SPEED; 175 break; 176 default: 177 break; 178 } 179 180 vhci_hcd->port_status[rhport] = status; 181 182 spin_unlock_irqrestore(&vhci->lock, flags); 183 184 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd)); 185 } 186 187 static void rh_port_disconnect(struct vhci_device *vdev) 188 { 189 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 190 struct vhci *vhci = vhci_hcd->vhci; 191 int rhport = vdev->rhport; 192 u32 status; 193 unsigned long flags; 194 195 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport); 196 197 spin_lock_irqsave(&vhci->lock, flags); 198 199 status = vhci_hcd->port_status[rhport]; 200 201 status &= ~USB_PORT_STAT_CONNECTION; 202 status |= (1 << USB_PORT_FEAT_C_CONNECTION); 203 204 vhci_hcd->port_status[rhport] = status; 205 206 spin_unlock_irqrestore(&vhci->lock, flags); 207 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd)); 208 } 209 210 #define PORT_C_MASK \ 211 ((USB_PORT_STAT_C_CONNECTION \ 212 | USB_PORT_STAT_C_ENABLE \ 213 | USB_PORT_STAT_C_SUSPEND \ 214 | USB_PORT_STAT_C_OVERCURRENT \ 215 | USB_PORT_STAT_C_RESET) << 16) 216 217 /* 218 * Returns 0 if the status hasn't changed, or the number of bytes in buf. 219 * Ports are 0-indexed from the HCD point of view, 220 * and 1-indexed from the USB core pointer of view. 221 * 222 * @buf: a bitmap to show which port status has been changed. 223 * bit 0: reserved 224 * bit 1: the status of port 0 has been changed. 225 * bit 2: the status of port 1 has been changed. 226 * ... 227 */ 228 static int vhci_hub_status(struct usb_hcd *hcd, char *buf) 229 { 230 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 231 struct vhci *vhci = vhci_hcd->vhci; 232 int retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8); 233 int rhport; 234 int changed = 0; 235 unsigned long flags; 236 237 memset(buf, 0, retval); 238 239 spin_lock_irqsave(&vhci->lock, flags); 240 if (!HCD_HW_ACCESSIBLE(hcd)) { 241 usbip_dbg_vhci_rh("hw accessible flag not on?\n"); 242 goto done; 243 } 244 245 /* check pseudo status register for each port */ 246 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 247 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) { 248 /* The status of a port has been changed, */ 249 usbip_dbg_vhci_rh("port %d status changed\n", rhport); 250 251 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8; 252 changed = 1; 253 } 254 } 255 256 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1)) 257 usb_hcd_resume_root_hub(hcd); 258 259 done: 260 spin_unlock_irqrestore(&vhci->lock, flags); 261 return changed ? retval : 0; 262 } 263 264 /* usb 3.0 root hub device descriptor */ 265 static struct { 266 struct usb_bos_descriptor bos; 267 struct usb_ss_cap_descriptor ss_cap; 268 } __packed usb3_bos_desc = { 269 270 .bos = { 271 .bLength = USB_DT_BOS_SIZE, 272 .bDescriptorType = USB_DT_BOS, 273 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 274 .bNumDeviceCaps = 1, 275 }, 276 .ss_cap = { 277 .bLength = USB_DT_USB_SS_CAP_SIZE, 278 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 279 .bDevCapabilityType = USB_SS_CAP_TYPE, 280 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 281 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 282 }, 283 }; 284 285 static inline void 286 ss_hub_descriptor(struct usb_hub_descriptor *desc) 287 { 288 memset(desc, 0, sizeof *desc); 289 desc->bDescriptorType = USB_DT_SS_HUB; 290 desc->bDescLength = 12; 291 desc->wHubCharacteristics = cpu_to_le16( 292 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM); 293 desc->bNbrPorts = VHCI_HC_PORTS; 294 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 295 desc->u.ss.DeviceRemovable = 0xffff; 296 } 297 298 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 299 { 300 int width; 301 302 memset(desc, 0, sizeof(*desc)); 303 desc->bDescriptorType = USB_DT_HUB; 304 desc->wHubCharacteristics = cpu_to_le16( 305 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM); 306 307 desc->bNbrPorts = VHCI_HC_PORTS; 308 BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN); 309 width = desc->bNbrPorts / 8 + 1; 310 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width; 311 memset(&desc->u.hs.DeviceRemovable[0], 0, width); 312 memset(&desc->u.hs.DeviceRemovable[width], 0xff, width); 313 } 314 315 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 316 u16 wIndex, char *buf, u16 wLength) 317 { 318 struct vhci_hcd *vhci_hcd; 319 struct vhci *vhci; 320 int retval = 0; 321 int rhport = -1; 322 unsigned long flags; 323 bool invalid_rhport = false; 324 325 u32 prev_port_status[VHCI_HC_PORTS]; 326 327 if (!HCD_HW_ACCESSIBLE(hcd)) 328 return -ETIMEDOUT; 329 330 /* 331 * NOTE: 332 * wIndex (bits 0-7) shows the port number and begins from 1? 333 */ 334 wIndex = ((__u8)(wIndex & 0x00ff)); 335 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue, 336 wIndex); 337 338 /* 339 * wIndex can be 0 for some request types (typeReq). rhport is 340 * in valid range when wIndex >= 1 and < VHCI_HC_PORTS. 341 * 342 * Reference port_status[] only with valid rhport when 343 * invalid_rhport is false. 344 */ 345 if (wIndex < 1 || wIndex > VHCI_HC_PORTS) { 346 invalid_rhport = true; 347 if (wIndex > VHCI_HC_PORTS) 348 pr_err("invalid port number %d\n", wIndex); 349 } else 350 rhport = wIndex - 1; 351 352 vhci_hcd = hcd_to_vhci_hcd(hcd); 353 vhci = vhci_hcd->vhci; 354 355 spin_lock_irqsave(&vhci->lock, flags); 356 357 /* store old status and compare now and old later */ 358 if (usbip_dbg_flag_vhci_rh) { 359 if (!invalid_rhport) 360 memcpy(prev_port_status, vhci_hcd->port_status, 361 sizeof(prev_port_status)); 362 } 363 364 switch (typeReq) { 365 case ClearHubFeature: 366 usbip_dbg_vhci_rh(" ClearHubFeature\n"); 367 break; 368 case ClearPortFeature: 369 if (invalid_rhport) { 370 pr_err("invalid port number %d\n", wIndex); 371 goto error; 372 } 373 switch (wValue) { 374 case USB_PORT_FEAT_SUSPEND: 375 if (hcd->speed == HCD_USB3) { 376 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not " 377 "supported for USB 3.0 roothub\n"); 378 goto error; 379 } 380 usbip_dbg_vhci_rh( 381 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n"); 382 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) { 383 /* 20msec signaling */ 384 vhci_hcd->resuming = 1; 385 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 386 } 387 break; 388 case USB_PORT_FEAT_POWER: 389 usbip_dbg_vhci_rh( 390 " ClearPortFeature: USB_PORT_FEAT_POWER\n"); 391 if (hcd->speed == HCD_USB3) 392 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER; 393 else 394 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER; 395 break; 396 default: 397 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n", 398 wValue); 399 vhci_hcd->port_status[rhport] &= ~(1 << wValue); 400 break; 401 } 402 break; 403 case GetHubDescriptor: 404 usbip_dbg_vhci_rh(" GetHubDescriptor\n"); 405 if (hcd->speed == HCD_USB3 && 406 (wLength < USB_DT_SS_HUB_SIZE || 407 wValue != (USB_DT_SS_HUB << 8))) { 408 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n"); 409 goto error; 410 } 411 if (hcd->speed == HCD_USB3) 412 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 413 else 414 hub_descriptor((struct usb_hub_descriptor *) buf); 415 break; 416 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 417 if (hcd->speed != HCD_USB3) 418 goto error; 419 420 if ((wValue >> 8) != USB_DT_BOS) 421 goto error; 422 423 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 424 retval = sizeof(usb3_bos_desc); 425 break; 426 case GetHubStatus: 427 usbip_dbg_vhci_rh(" GetHubStatus\n"); 428 *(__le32 *) buf = cpu_to_le32(0); 429 break; 430 case GetPortStatus: 431 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex); 432 if (invalid_rhport) { 433 pr_err("invalid port number %d\n", wIndex); 434 retval = -EPIPE; 435 goto error; 436 } 437 438 /* we do not care about resume. */ 439 440 /* whoever resets or resumes must GetPortStatus to 441 * complete it!! 442 */ 443 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) { 444 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND); 445 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND); 446 vhci_hcd->resuming = 0; 447 vhci_hcd->re_timeout = 0; 448 } 449 450 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) != 451 0 && time_after(jiffies, vhci_hcd->re_timeout)) { 452 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET); 453 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET); 454 vhci_hcd->re_timeout = 0; 455 456 if (vhci_hcd->vdev[rhport].ud.status == 457 VDEV_ST_NOTASSIGNED) { 458 usbip_dbg_vhci_rh( 459 " enable rhport %d (status %u)\n", 460 rhport, 461 vhci_hcd->vdev[rhport].ud.status); 462 vhci_hcd->port_status[rhport] |= 463 USB_PORT_STAT_ENABLE; 464 } 465 466 if (hcd->speed < HCD_USB3) { 467 switch (vhci_hcd->vdev[rhport].speed) { 468 case USB_SPEED_HIGH: 469 vhci_hcd->port_status[rhport] |= 470 USB_PORT_STAT_HIGH_SPEED; 471 break; 472 case USB_SPEED_LOW: 473 vhci_hcd->port_status[rhport] |= 474 USB_PORT_STAT_LOW_SPEED; 475 break; 476 default: 477 pr_err("vhci_device speed not set\n"); 478 break; 479 } 480 } 481 } 482 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]); 483 ((__le16 *) buf)[1] = 484 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16); 485 486 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0], 487 ((u16 *)buf)[1]); 488 break; 489 case SetHubFeature: 490 usbip_dbg_vhci_rh(" SetHubFeature\n"); 491 retval = -EPIPE; 492 break; 493 case SetPortFeature: 494 switch (wValue) { 495 case USB_PORT_FEAT_LINK_STATE: 496 usbip_dbg_vhci_rh( 497 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n"); 498 if (hcd->speed != HCD_USB3) { 499 pr_err("USB_PORT_FEAT_LINK_STATE req not " 500 "supported for USB 2.0 roothub\n"); 501 goto error; 502 } 503 /* 504 * Since this is dummy we don't have an actual link so 505 * there is nothing to do for the SET_LINK_STATE cmd 506 */ 507 break; 508 case USB_PORT_FEAT_U1_TIMEOUT: 509 usbip_dbg_vhci_rh( 510 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n"); 511 case USB_PORT_FEAT_U2_TIMEOUT: 512 usbip_dbg_vhci_rh( 513 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n"); 514 /* TODO: add suspend/resume support! */ 515 if (hcd->speed != HCD_USB3) { 516 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not " 517 "supported for USB 2.0 roothub\n"); 518 goto error; 519 } 520 break; 521 case USB_PORT_FEAT_SUSPEND: 522 usbip_dbg_vhci_rh( 523 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n"); 524 /* Applicable only for USB2.0 hub */ 525 if (hcd->speed == HCD_USB3) { 526 pr_err("USB_PORT_FEAT_SUSPEND req not " 527 "supported for USB 3.0 roothub\n"); 528 goto error; 529 } 530 531 if (invalid_rhport) { 532 pr_err("invalid port number %d\n", wIndex); 533 goto error; 534 } 535 536 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND; 537 break; 538 case USB_PORT_FEAT_POWER: 539 usbip_dbg_vhci_rh( 540 " SetPortFeature: USB_PORT_FEAT_POWER\n"); 541 if (invalid_rhport) { 542 pr_err("invalid port number %d\n", wIndex); 543 goto error; 544 } 545 if (hcd->speed == HCD_USB3) 546 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER; 547 else 548 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER; 549 break; 550 case USB_PORT_FEAT_BH_PORT_RESET: 551 usbip_dbg_vhci_rh( 552 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n"); 553 if (invalid_rhport) { 554 pr_err("invalid port number %d\n", wIndex); 555 goto error; 556 } 557 /* Applicable only for USB3.0 hub */ 558 if (hcd->speed != HCD_USB3) { 559 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not " 560 "supported for USB 2.0 roothub\n"); 561 goto error; 562 } 563 /* FALLS THROUGH */ 564 case USB_PORT_FEAT_RESET: 565 usbip_dbg_vhci_rh( 566 " SetPortFeature: USB_PORT_FEAT_RESET\n"); 567 if (invalid_rhport) { 568 pr_err("invalid port number %d\n", wIndex); 569 goto error; 570 } 571 /* if it's already enabled, disable */ 572 if (hcd->speed == HCD_USB3) { 573 vhci_hcd->port_status[rhport] = 0; 574 vhci_hcd->port_status[rhport] = 575 (USB_SS_PORT_STAT_POWER | 576 USB_PORT_STAT_CONNECTION | 577 USB_PORT_STAT_RESET); 578 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) { 579 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE 580 | USB_PORT_STAT_LOW_SPEED 581 | USB_PORT_STAT_HIGH_SPEED); 582 } 583 584 /* 50msec reset signaling */ 585 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 586 587 /* FALLS THROUGH */ 588 default: 589 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n", 590 wValue); 591 if (invalid_rhport) { 592 pr_err("invalid port number %d\n", wIndex); 593 goto error; 594 } 595 if (hcd->speed == HCD_USB3) { 596 if ((vhci_hcd->port_status[rhport] & 597 USB_SS_PORT_STAT_POWER) != 0) { 598 vhci_hcd->port_status[rhport] |= (1 << wValue); 599 } 600 } else 601 if ((vhci_hcd->port_status[rhport] & 602 USB_PORT_STAT_POWER) != 0) { 603 vhci_hcd->port_status[rhport] |= (1 << wValue); 604 } 605 } 606 break; 607 case GetPortErrorCount: 608 usbip_dbg_vhci_rh(" GetPortErrorCount\n"); 609 if (hcd->speed != HCD_USB3) { 610 pr_err("GetPortErrorCount req not " 611 "supported for USB 2.0 roothub\n"); 612 goto error; 613 } 614 /* We'll always return 0 since this is a dummy hub */ 615 *(__le32 *) buf = cpu_to_le32(0); 616 break; 617 case SetHubDepth: 618 usbip_dbg_vhci_rh(" SetHubDepth\n"); 619 if (hcd->speed != HCD_USB3) { 620 pr_err("SetHubDepth req not supported for " 621 "USB 2.0 roothub\n"); 622 goto error; 623 } 624 break; 625 default: 626 pr_err("default hub control req: %04x v%04x i%04x l%d\n", 627 typeReq, wValue, wIndex, wLength); 628 error: 629 /* "protocol stall" on error */ 630 retval = -EPIPE; 631 } 632 633 if (usbip_dbg_flag_vhci_rh) { 634 pr_debug("port %d\n", rhport); 635 /* Only dump valid port status */ 636 if (!invalid_rhport) { 637 dump_port_status_diff(prev_port_status[rhport], 638 vhci_hcd->port_status[rhport], 639 hcd->speed == HCD_USB3); 640 } 641 } 642 usbip_dbg_vhci_rh(" bye\n"); 643 644 spin_unlock_irqrestore(&vhci->lock, flags); 645 646 if (!invalid_rhport && 647 (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) { 648 usb_hcd_poll_rh_status(hcd); 649 } 650 651 return retval; 652 } 653 654 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev) 655 { 656 struct vhci_priv *priv; 657 struct vhci_hcd *vhci_hcd; 658 unsigned long flags; 659 660 if (!vdev) { 661 pr_err("could not get virtual device"); 662 return; 663 } 664 vhci_hcd = vdev_to_vhci_hcd(vdev); 665 666 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC); 667 if (!priv) { 668 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 669 return; 670 } 671 672 spin_lock_irqsave(&vdev->priv_lock, flags); 673 674 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 675 if (priv->seqnum == 0xffff) 676 dev_info(&urb->dev->dev, "seqnum max\n"); 677 678 priv->vdev = vdev; 679 priv->urb = urb; 680 681 urb->hcpriv = (void *) priv; 682 683 list_add_tail(&priv->list, &vdev->priv_tx); 684 685 wake_up(&vdev->waitq_tx); 686 spin_unlock_irqrestore(&vdev->priv_lock, flags); 687 } 688 689 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 690 { 691 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 692 struct vhci *vhci = vhci_hcd->vhci; 693 struct device *dev = &urb->dev->dev; 694 u8 portnum = urb->dev->portnum; 695 int ret = 0; 696 struct vhci_device *vdev; 697 unsigned long flags; 698 699 if (portnum > VHCI_HC_PORTS) { 700 pr_err("invalid port number %d\n", portnum); 701 return -ENODEV; 702 } 703 vdev = &vhci_hcd->vdev[portnum-1]; 704 705 /* patch to usb_sg_init() is in 2.5.60 */ 706 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length); 707 708 spin_lock_irqsave(&vhci->lock, flags); 709 710 if (urb->status != -EINPROGRESS) { 711 dev_err(dev, "URB already unlinked!, status %d\n", urb->status); 712 spin_unlock_irqrestore(&vhci->lock, flags); 713 return urb->status; 714 } 715 716 /* refuse enqueue for dead connection */ 717 spin_lock(&vdev->ud.lock); 718 if (vdev->ud.status == VDEV_ST_NULL || 719 vdev->ud.status == VDEV_ST_ERROR) { 720 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport); 721 spin_unlock(&vdev->ud.lock); 722 spin_unlock_irqrestore(&vhci->lock, flags); 723 return -ENODEV; 724 } 725 spin_unlock(&vdev->ud.lock); 726 727 ret = usb_hcd_link_urb_to_ep(hcd, urb); 728 if (ret) 729 goto no_need_unlink; 730 731 /* 732 * The enumeration process is as follows; 733 * 734 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0) 735 * to get max packet length of default pipe 736 * 737 * 2. Set_Address request to DevAddr(0) EndPoint(0) 738 * 739 */ 740 if (usb_pipedevice(urb->pipe) == 0) { 741 __u8 type = usb_pipetype(urb->pipe); 742 struct usb_ctrlrequest *ctrlreq = 743 (struct usb_ctrlrequest *) urb->setup_packet; 744 745 if (type != PIPE_CONTROL || !ctrlreq) { 746 dev_err(dev, "invalid request to devnum 0\n"); 747 ret = -EINVAL; 748 goto no_need_xmit; 749 } 750 751 switch (ctrlreq->bRequest) { 752 case USB_REQ_SET_ADDRESS: 753 /* set_address may come when a device is reset */ 754 dev_info(dev, "SetAddress Request (%d) to port %d\n", 755 ctrlreq->wValue, vdev->rhport); 756 757 usb_put_dev(vdev->udev); 758 vdev->udev = usb_get_dev(urb->dev); 759 760 spin_lock(&vdev->ud.lock); 761 vdev->ud.status = VDEV_ST_USED; 762 spin_unlock(&vdev->ud.lock); 763 764 if (urb->status == -EINPROGRESS) { 765 /* This request is successfully completed. */ 766 /* If not -EINPROGRESS, possibly unlinked. */ 767 urb->status = 0; 768 } 769 770 goto no_need_xmit; 771 772 case USB_REQ_GET_DESCRIPTOR: 773 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8)) 774 usbip_dbg_vhci_hc( 775 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n"); 776 777 usb_put_dev(vdev->udev); 778 vdev->udev = usb_get_dev(urb->dev); 779 goto out; 780 781 default: 782 /* NOT REACHED */ 783 dev_err(dev, 784 "invalid request to devnum 0 bRequest %u, wValue %u\n", 785 ctrlreq->bRequest, 786 ctrlreq->wValue); 787 ret = -EINVAL; 788 goto no_need_xmit; 789 } 790 791 } 792 793 out: 794 vhci_tx_urb(urb, vdev); 795 spin_unlock_irqrestore(&vhci->lock, flags); 796 797 return 0; 798 799 no_need_xmit: 800 usb_hcd_unlink_urb_from_ep(hcd, urb); 801 no_need_unlink: 802 spin_unlock_irqrestore(&vhci->lock, flags); 803 if (!ret) 804 usb_hcd_giveback_urb(hcd, urb, urb->status); 805 return ret; 806 } 807 808 /* 809 * vhci_rx gives back the urb after receiving the reply of the urb. If an 810 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives 811 * back its urb. For the driver unlinking the urb, the content of the urb is 812 * not important, but the calling to its completion handler is important; the 813 * completion of unlinking is notified by the completion handler. 814 * 815 * 816 * CLIENT SIDE 817 * 818 * - When vhci_hcd receives RET_SUBMIT, 819 * 820 * - case 1a). the urb of the pdu is not unlinking. 821 * - normal case 822 * => just give back the urb 823 * 824 * - case 1b). the urb of the pdu is unlinking. 825 * - usbip.ko will return a reply of the unlinking request. 826 * => give back the urb now and go to case 2b). 827 * 828 * - When vhci_hcd receives RET_UNLINK, 829 * 830 * - case 2a). a submit request is still pending in vhci_hcd. 831 * - urb was really pending in usbip.ko and urb_unlink_urb() was 832 * completed there. 833 * => free a pending submit request 834 * => notify unlink completeness by giving back the urb 835 * 836 * - case 2b). a submit request is *not* pending in vhci_hcd. 837 * - urb was already given back to the core driver. 838 * => do not give back the urb 839 * 840 * 841 * SERVER SIDE 842 * 843 * - When usbip receives CMD_UNLINK, 844 * 845 * - case 3a). the urb of the unlink request is now in submission. 846 * => do usb_unlink_urb(). 847 * => after the unlink is completed, send RET_UNLINK. 848 * 849 * - case 3b). the urb of the unlink request is not in submission. 850 * - may be already completed or never be received 851 * => send RET_UNLINK 852 * 853 */ 854 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 855 { 856 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 857 struct vhci *vhci = vhci_hcd->vhci; 858 struct vhci_priv *priv; 859 struct vhci_device *vdev; 860 unsigned long flags; 861 862 spin_lock_irqsave(&vhci->lock, flags); 863 864 priv = urb->hcpriv; 865 if (!priv) { 866 /* URB was never linked! or will be soon given back by 867 * vhci_rx. */ 868 spin_unlock_irqrestore(&vhci->lock, flags); 869 return -EIDRM; 870 } 871 872 { 873 int ret = 0; 874 875 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 876 if (ret) { 877 spin_unlock_irqrestore(&vhci->lock, flags); 878 return ret; 879 } 880 } 881 882 /* send unlink request here? */ 883 vdev = priv->vdev; 884 885 if (!vdev->ud.tcp_socket) { 886 /* tcp connection is closed */ 887 spin_lock(&vdev->priv_lock); 888 889 list_del(&priv->list); 890 kfree(priv); 891 urb->hcpriv = NULL; 892 893 spin_unlock(&vdev->priv_lock); 894 895 /* 896 * If tcp connection is alive, we have sent CMD_UNLINK. 897 * vhci_rx will receive RET_UNLINK and give back the URB. 898 * Otherwise, we give back it here. 899 */ 900 usb_hcd_unlink_urb_from_ep(hcd, urb); 901 902 spin_unlock_irqrestore(&vhci->lock, flags); 903 usb_hcd_giveback_urb(hcd, urb, urb->status); 904 spin_lock_irqsave(&vhci->lock, flags); 905 906 } else { 907 /* tcp connection is alive */ 908 struct vhci_unlink *unlink; 909 910 spin_lock(&vdev->priv_lock); 911 912 /* setup CMD_UNLINK pdu */ 913 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC); 914 if (!unlink) { 915 spin_unlock(&vdev->priv_lock); 916 spin_unlock_irqrestore(&vhci->lock, flags); 917 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 918 return -ENOMEM; 919 } 920 921 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 922 if (unlink->seqnum == 0xffff) 923 pr_info("seqnum max\n"); 924 925 unlink->unlink_seqnum = priv->seqnum; 926 927 /* send cmd_unlink and try to cancel the pending URB in the 928 * peer */ 929 list_add_tail(&unlink->list, &vdev->unlink_tx); 930 wake_up(&vdev->waitq_tx); 931 932 spin_unlock(&vdev->priv_lock); 933 } 934 935 spin_unlock_irqrestore(&vhci->lock, flags); 936 937 usbip_dbg_vhci_hc("leave\n"); 938 return 0; 939 } 940 941 static void vhci_device_unlink_cleanup(struct vhci_device *vdev) 942 { 943 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 944 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd); 945 struct vhci *vhci = vhci_hcd->vhci; 946 struct vhci_unlink *unlink, *tmp; 947 unsigned long flags; 948 949 spin_lock_irqsave(&vhci->lock, flags); 950 spin_lock(&vdev->priv_lock); 951 952 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { 953 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); 954 list_del(&unlink->list); 955 kfree(unlink); 956 } 957 958 while (!list_empty(&vdev->unlink_rx)) { 959 struct urb *urb; 960 961 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink, 962 list); 963 964 /* give back URB of unanswered unlink request */ 965 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum); 966 967 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); 968 if (!urb) { 969 pr_info("the urb (seqnum %lu) was already given back\n", 970 unlink->unlink_seqnum); 971 list_del(&unlink->list); 972 kfree(unlink); 973 continue; 974 } 975 976 urb->status = -ENODEV; 977 978 usb_hcd_unlink_urb_from_ep(hcd, urb); 979 980 list_del(&unlink->list); 981 982 spin_unlock(&vdev->priv_lock); 983 spin_unlock_irqrestore(&vhci->lock, flags); 984 985 usb_hcd_giveback_urb(hcd, urb, urb->status); 986 987 spin_lock_irqsave(&vhci->lock, flags); 988 spin_lock(&vdev->priv_lock); 989 990 kfree(unlink); 991 } 992 993 spin_unlock(&vdev->priv_lock); 994 spin_unlock_irqrestore(&vhci->lock, flags); 995 } 996 997 /* 998 * The important thing is that only one context begins cleanup. 999 * This is why error handling and cleanup become simple. 1000 * We do not want to consider race condition as possible. 1001 */ 1002 static void vhci_shutdown_connection(struct usbip_device *ud) 1003 { 1004 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1005 1006 /* need this? see stub_dev.c */ 1007 if (ud->tcp_socket) { 1008 pr_debug("shutdown tcp_socket %d\n", ud->sockfd); 1009 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); 1010 } 1011 1012 /* kill threads related to this sdev */ 1013 if (vdev->ud.tcp_rx) { 1014 kthread_stop_put(vdev->ud.tcp_rx); 1015 vdev->ud.tcp_rx = NULL; 1016 } 1017 if (vdev->ud.tcp_tx) { 1018 kthread_stop_put(vdev->ud.tcp_tx); 1019 vdev->ud.tcp_tx = NULL; 1020 } 1021 pr_info("stop threads\n"); 1022 1023 /* active connection is closed */ 1024 if (vdev->ud.tcp_socket) { 1025 sockfd_put(vdev->ud.tcp_socket); 1026 vdev->ud.tcp_socket = NULL; 1027 vdev->ud.sockfd = -1; 1028 } 1029 pr_info("release socket\n"); 1030 1031 vhci_device_unlink_cleanup(vdev); 1032 1033 /* 1034 * rh_port_disconnect() is a trigger of ... 1035 * usb_disable_device(): 1036 * disable all the endpoints for a USB device. 1037 * usb_disable_endpoint(): 1038 * disable endpoints. pending urbs are unlinked(dequeued). 1039 * 1040 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a 1041 * detached device should release used urbs in a cleanup function (i.e. 1042 * xxx_disconnect()). Therefore, vhci_hcd does not need to release 1043 * pushed urbs and their private data in this function. 1044 * 1045 * NOTE: vhci_dequeue() must be considered carefully. When shutting down 1046 * a connection, vhci_shutdown_connection() expects vhci_dequeue() 1047 * gives back pushed urbs and frees their private data by request of 1048 * the cleanup function of a USB driver. When unlinking a urb with an 1049 * active connection, vhci_dequeue() does not give back the urb which 1050 * is actually given back by vhci_rx after receiving its return pdu. 1051 * 1052 */ 1053 rh_port_disconnect(vdev); 1054 1055 pr_info("disconnect device\n"); 1056 } 1057 1058 static void vhci_device_reset(struct usbip_device *ud) 1059 { 1060 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1061 unsigned long flags; 1062 1063 spin_lock_irqsave(&ud->lock, flags); 1064 1065 vdev->speed = 0; 1066 vdev->devid = 0; 1067 1068 usb_put_dev(vdev->udev); 1069 vdev->udev = NULL; 1070 1071 if (ud->tcp_socket) { 1072 sockfd_put(ud->tcp_socket); 1073 ud->tcp_socket = NULL; 1074 ud->sockfd = -1; 1075 } 1076 ud->status = VDEV_ST_NULL; 1077 1078 spin_unlock_irqrestore(&ud->lock, flags); 1079 } 1080 1081 static void vhci_device_unusable(struct usbip_device *ud) 1082 { 1083 unsigned long flags; 1084 1085 spin_lock_irqsave(&ud->lock, flags); 1086 ud->status = VDEV_ST_ERROR; 1087 spin_unlock_irqrestore(&ud->lock, flags); 1088 } 1089 1090 static void vhci_device_init(struct vhci_device *vdev) 1091 { 1092 memset(vdev, 0, sizeof(struct vhci_device)); 1093 1094 vdev->ud.side = USBIP_VHCI; 1095 vdev->ud.status = VDEV_ST_NULL; 1096 spin_lock_init(&vdev->ud.lock); 1097 1098 INIT_LIST_HEAD(&vdev->priv_rx); 1099 INIT_LIST_HEAD(&vdev->priv_tx); 1100 INIT_LIST_HEAD(&vdev->unlink_tx); 1101 INIT_LIST_HEAD(&vdev->unlink_rx); 1102 spin_lock_init(&vdev->priv_lock); 1103 1104 init_waitqueue_head(&vdev->waitq_tx); 1105 1106 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection; 1107 vdev->ud.eh_ops.reset = vhci_device_reset; 1108 vdev->ud.eh_ops.unusable = vhci_device_unusable; 1109 1110 usbip_start_eh(&vdev->ud); 1111 } 1112 1113 static int hcd_name_to_id(const char *name) 1114 { 1115 char *c; 1116 long val; 1117 int ret; 1118 1119 c = strchr(name, '.'); 1120 if (c == NULL) 1121 return 0; 1122 1123 ret = kstrtol(c+1, 10, &val); 1124 if (ret < 0) 1125 return ret; 1126 1127 return val; 1128 } 1129 1130 static int vhci_setup(struct usb_hcd *hcd) 1131 { 1132 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1133 if (usb_hcd_is_primary_hcd(hcd)) { 1134 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd); 1135 vhci->vhci_hcd_hs->vhci = vhci; 1136 /* 1137 * Mark the first roothub as being USB 2.0. 1138 * The USB 3.0 roothub will be registered later by 1139 * vhci_hcd_probe() 1140 */ 1141 hcd->speed = HCD_USB2; 1142 hcd->self.root_hub->speed = USB_SPEED_HIGH; 1143 } else { 1144 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd); 1145 vhci->vhci_hcd_ss->vhci = vhci; 1146 hcd->speed = HCD_USB3; 1147 hcd->self.root_hub->speed = USB_SPEED_SUPER; 1148 } 1149 return 0; 1150 } 1151 1152 static int vhci_start(struct usb_hcd *hcd) 1153 { 1154 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1155 int id, rhport; 1156 int err; 1157 1158 usbip_dbg_vhci_hc("enter vhci_start\n"); 1159 1160 if (usb_hcd_is_primary_hcd(hcd)) 1161 spin_lock_init(&vhci_hcd->vhci->lock); 1162 1163 /* initialize private data of usb_hcd */ 1164 1165 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1166 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1167 1168 vhci_device_init(vdev); 1169 vdev->rhport = rhport; 1170 } 1171 1172 atomic_set(&vhci_hcd->seqnum, 0); 1173 1174 hcd->power_budget = 0; /* no limit */ 1175 hcd->uses_new_polling = 1; 1176 1177 #ifdef CONFIG_USB_OTG 1178 hcd->self.otg_port = 1; 1179 #endif 1180 1181 id = hcd_name_to_id(hcd_name(hcd)); 1182 if (id < 0) { 1183 pr_err("invalid vhci name %s\n", hcd_name(hcd)); 1184 return -EINVAL; 1185 } 1186 1187 /* vhci_hcd is now ready to be controlled through sysfs */ 1188 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1189 err = vhci_init_attr_group(); 1190 if (err) { 1191 pr_err("init attr group\n"); 1192 return err; 1193 } 1194 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1195 if (err) { 1196 pr_err("create sysfs files\n"); 1197 vhci_finish_attr_group(); 1198 return err; 1199 } 1200 pr_info("created sysfs %s\n", hcd_name(hcd)); 1201 } 1202 1203 return 0; 1204 } 1205 1206 static void vhci_stop(struct usb_hcd *hcd) 1207 { 1208 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1209 int id, rhport; 1210 1211 usbip_dbg_vhci_hc("stop VHCI controller\n"); 1212 1213 /* 1. remove the userland interface of vhci_hcd */ 1214 id = hcd_name_to_id(hcd_name(hcd)); 1215 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1216 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1217 vhci_finish_attr_group(); 1218 } 1219 1220 /* 2. shutdown all the ports of vhci_hcd */ 1221 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1222 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1223 1224 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED); 1225 usbip_stop_eh(&vdev->ud); 1226 } 1227 } 1228 1229 static int vhci_get_frame_number(struct usb_hcd *hcd) 1230 { 1231 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n"); 1232 return 0; 1233 } 1234 1235 #ifdef CONFIG_PM 1236 1237 /* FIXME: suspend/resume */ 1238 static int vhci_bus_suspend(struct usb_hcd *hcd) 1239 { 1240 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1241 unsigned long flags; 1242 1243 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1244 1245 spin_lock_irqsave(&vhci->lock, flags); 1246 hcd->state = HC_STATE_SUSPENDED; 1247 spin_unlock_irqrestore(&vhci->lock, flags); 1248 1249 return 0; 1250 } 1251 1252 static int vhci_bus_resume(struct usb_hcd *hcd) 1253 { 1254 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1255 int rc = 0; 1256 unsigned long flags; 1257 1258 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1259 1260 spin_lock_irqsave(&vhci->lock, flags); 1261 if (!HCD_HW_ACCESSIBLE(hcd)) 1262 rc = -ESHUTDOWN; 1263 else 1264 hcd->state = HC_STATE_RUNNING; 1265 spin_unlock_irqrestore(&vhci->lock, flags); 1266 1267 return rc; 1268 } 1269 1270 #else 1271 1272 #define vhci_bus_suspend NULL 1273 #define vhci_bus_resume NULL 1274 #endif 1275 1276 /* Change a group of bulk endpoints to support multiple stream IDs */ 1277 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 1278 struct usb_host_endpoint **eps, unsigned int num_eps, 1279 unsigned int num_streams, gfp_t mem_flags) 1280 { 1281 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n"); 1282 return 0; 1283 } 1284 1285 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 1286 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 1287 struct usb_host_endpoint **eps, unsigned int num_eps, 1288 gfp_t mem_flags) 1289 { 1290 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n"); 1291 return 0; 1292 } 1293 1294 static const struct hc_driver vhci_hc_driver = { 1295 .description = driver_name, 1296 .product_desc = driver_desc, 1297 .hcd_priv_size = sizeof(struct vhci_hcd), 1298 1299 .flags = HCD_USB3 | HCD_SHARED, 1300 1301 .reset = vhci_setup, 1302 .start = vhci_start, 1303 .stop = vhci_stop, 1304 1305 .urb_enqueue = vhci_urb_enqueue, 1306 .urb_dequeue = vhci_urb_dequeue, 1307 1308 .get_frame_number = vhci_get_frame_number, 1309 1310 .hub_status_data = vhci_hub_status, 1311 .hub_control = vhci_hub_control, 1312 .bus_suspend = vhci_bus_suspend, 1313 .bus_resume = vhci_bus_resume, 1314 1315 .alloc_streams = vhci_alloc_streams, 1316 .free_streams = vhci_free_streams, 1317 }; 1318 1319 static int vhci_hcd_probe(struct platform_device *pdev) 1320 { 1321 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1322 struct usb_hcd *hcd_hs; 1323 struct usb_hcd *hcd_ss; 1324 int ret; 1325 1326 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id); 1327 1328 /* 1329 * Allocate and initialize hcd. 1330 * Our private data is also allocated automatically. 1331 */ 1332 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); 1333 if (!hcd_hs) { 1334 pr_err("create primary hcd failed\n"); 1335 return -ENOMEM; 1336 } 1337 hcd_hs->has_tt = 1; 1338 1339 /* 1340 * Finish generic HCD structure initialization and register. 1341 * Call the driver's reset() and start() routines. 1342 */ 1343 ret = usb_add_hcd(hcd_hs, 0, 0); 1344 if (ret != 0) { 1345 pr_err("usb_add_hcd hs failed %d\n", ret); 1346 goto put_usb2_hcd; 1347 } 1348 1349 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev, 1350 dev_name(&pdev->dev), hcd_hs); 1351 if (!hcd_ss) { 1352 ret = -ENOMEM; 1353 pr_err("create shared hcd failed\n"); 1354 goto remove_usb2_hcd; 1355 } 1356 1357 ret = usb_add_hcd(hcd_ss, 0, 0); 1358 if (ret) { 1359 pr_err("usb_add_hcd ss failed %d\n", ret); 1360 goto put_usb3_hcd; 1361 } 1362 1363 usbip_dbg_vhci_hc("bye\n"); 1364 return 0; 1365 1366 put_usb3_hcd: 1367 usb_put_hcd(hcd_ss); 1368 remove_usb2_hcd: 1369 usb_remove_hcd(hcd_hs); 1370 put_usb2_hcd: 1371 usb_put_hcd(hcd_hs); 1372 vhci->vhci_hcd_hs = NULL; 1373 vhci->vhci_hcd_ss = NULL; 1374 return ret; 1375 } 1376 1377 static int vhci_hcd_remove(struct platform_device *pdev) 1378 { 1379 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1380 1381 /* 1382 * Disconnects the root hub, 1383 * then reverses the effects of usb_add_hcd(), 1384 * invoking the HCD's stop() methods. 1385 */ 1386 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1387 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1388 1389 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1390 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1391 1392 vhci->vhci_hcd_hs = NULL; 1393 vhci->vhci_hcd_ss = NULL; 1394 1395 return 0; 1396 } 1397 1398 #ifdef CONFIG_PM 1399 1400 /* what should happen for USB/IP under suspend/resume? */ 1401 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state) 1402 { 1403 struct usb_hcd *hcd; 1404 struct vhci *vhci; 1405 int rhport; 1406 int connected = 0; 1407 int ret = 0; 1408 unsigned long flags; 1409 1410 dev_dbg(&pdev->dev, "%s\n", __func__); 1411 1412 hcd = platform_get_drvdata(pdev); 1413 if (!hcd) 1414 return 0; 1415 1416 vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1417 1418 spin_lock_irqsave(&vhci->lock, flags); 1419 1420 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1421 if (vhci->vhci_hcd_hs->port_status[rhport] & 1422 USB_PORT_STAT_CONNECTION) 1423 connected += 1; 1424 1425 if (vhci->vhci_hcd_ss->port_status[rhport] & 1426 USB_PORT_STAT_CONNECTION) 1427 connected += 1; 1428 } 1429 1430 spin_unlock_irqrestore(&vhci->lock, flags); 1431 1432 if (connected > 0) { 1433 dev_info(&pdev->dev, 1434 "We have %d active connection%s. Do not suspend.\n", 1435 connected, (connected == 1 ? "" : "s")); 1436 ret = -EBUSY; 1437 } else { 1438 dev_info(&pdev->dev, "suspend vhci_hcd"); 1439 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1440 } 1441 1442 return ret; 1443 } 1444 1445 static int vhci_hcd_resume(struct platform_device *pdev) 1446 { 1447 struct usb_hcd *hcd; 1448 1449 dev_dbg(&pdev->dev, "%s\n", __func__); 1450 1451 hcd = platform_get_drvdata(pdev); 1452 if (!hcd) 1453 return 0; 1454 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1455 usb_hcd_poll_rh_status(hcd); 1456 1457 return 0; 1458 } 1459 1460 #else 1461 1462 #define vhci_hcd_suspend NULL 1463 #define vhci_hcd_resume NULL 1464 1465 #endif 1466 1467 static struct platform_driver vhci_driver = { 1468 .probe = vhci_hcd_probe, 1469 .remove = vhci_hcd_remove, 1470 .suspend = vhci_hcd_suspend, 1471 .resume = vhci_hcd_resume, 1472 .driver = { 1473 .name = driver_name, 1474 }, 1475 }; 1476 1477 static void del_platform_devices(void) 1478 { 1479 struct platform_device *pdev; 1480 int i; 1481 1482 for (i = 0; i < vhci_num_controllers; i++) { 1483 pdev = vhcis[i].pdev; 1484 if (pdev != NULL) 1485 platform_device_unregister(pdev); 1486 vhcis[i].pdev = NULL; 1487 } 1488 sysfs_remove_link(&platform_bus.kobj, driver_name); 1489 } 1490 1491 static int __init vhci_hcd_init(void) 1492 { 1493 int i, ret; 1494 1495 if (usb_disabled()) 1496 return -ENODEV; 1497 1498 if (vhci_num_controllers < 1) 1499 vhci_num_controllers = 1; 1500 1501 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL); 1502 if (vhcis == NULL) 1503 return -ENOMEM; 1504 1505 for (i = 0; i < vhci_num_controllers; i++) { 1506 vhcis[i].pdev = platform_device_alloc(driver_name, i); 1507 if (!vhcis[i].pdev) { 1508 i--; 1509 while (i >= 0) 1510 platform_device_put(vhcis[i--].pdev); 1511 ret = -ENOMEM; 1512 goto err_device_alloc; 1513 } 1514 } 1515 for (i = 0; i < vhci_num_controllers; i++) { 1516 void *vhci = &vhcis[i]; 1517 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *)); 1518 if (ret) 1519 goto err_driver_register; 1520 } 1521 1522 ret = platform_driver_register(&vhci_driver); 1523 if (ret) 1524 goto err_driver_register; 1525 1526 for (i = 0; i < vhci_num_controllers; i++) { 1527 ret = platform_device_add(vhcis[i].pdev); 1528 if (ret < 0) { 1529 i--; 1530 while (i >= 0) 1531 platform_device_del(vhcis[i--].pdev); 1532 goto err_add_hcd; 1533 } 1534 } 1535 1536 return ret; 1537 1538 err_add_hcd: 1539 platform_driver_unregister(&vhci_driver); 1540 err_driver_register: 1541 for (i = 0; i < vhci_num_controllers; i++) 1542 platform_device_put(vhcis[i].pdev); 1543 err_device_alloc: 1544 kfree(vhcis); 1545 return ret; 1546 } 1547 1548 static void __exit vhci_hcd_exit(void) 1549 { 1550 del_platform_devices(); 1551 platform_driver_unregister(&vhci_driver); 1552 kfree(vhcis); 1553 } 1554 1555 module_init(vhci_hcd_init); 1556 module_exit(vhci_hcd_exit); 1557 1558 MODULE_AUTHOR(DRIVER_AUTHOR); 1559 MODULE_DESCRIPTION(DRIVER_DESC); 1560 MODULE_LICENSE("GPL"); 1561