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; 322 unsigned long flags; 323 324 u32 prev_port_status[VHCI_HC_PORTS]; 325 326 if (!HCD_HW_ACCESSIBLE(hcd)) 327 return -ETIMEDOUT; 328 329 /* 330 * NOTE: 331 * wIndex (bits 0-7) shows the port number and begins from 1? 332 */ 333 wIndex = ((__u8)(wIndex & 0x00ff)); 334 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue, 335 wIndex); 336 337 if (wIndex > VHCI_HC_PORTS) 338 pr_err("invalid port number %d\n", wIndex); 339 rhport = wIndex - 1; 340 341 vhci_hcd = hcd_to_vhci_hcd(hcd); 342 vhci = vhci_hcd->vhci; 343 344 spin_lock_irqsave(&vhci->lock, flags); 345 346 /* store old status and compare now and old later */ 347 if (usbip_dbg_flag_vhci_rh) { 348 memcpy(prev_port_status, vhci_hcd->port_status, 349 sizeof(prev_port_status)); 350 } 351 352 switch (typeReq) { 353 case ClearHubFeature: 354 usbip_dbg_vhci_rh(" ClearHubFeature\n"); 355 break; 356 case ClearPortFeature: 357 if (rhport < 0) 358 goto error; 359 switch (wValue) { 360 case USB_PORT_FEAT_SUSPEND: 361 if (hcd->speed == HCD_USB3) { 362 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not " 363 "supported for USB 3.0 roothub\n"); 364 goto error; 365 } 366 usbip_dbg_vhci_rh( 367 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n"); 368 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) { 369 /* 20msec signaling */ 370 vhci_hcd->resuming = 1; 371 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 372 } 373 break; 374 case USB_PORT_FEAT_POWER: 375 usbip_dbg_vhci_rh( 376 " ClearPortFeature: USB_PORT_FEAT_POWER\n"); 377 if (hcd->speed == HCD_USB3) 378 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER; 379 else 380 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER; 381 break; 382 default: 383 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n", 384 wValue); 385 vhci_hcd->port_status[rhport] &= ~(1 << wValue); 386 break; 387 } 388 break; 389 case GetHubDescriptor: 390 usbip_dbg_vhci_rh(" GetHubDescriptor\n"); 391 if (hcd->speed == HCD_USB3 && 392 (wLength < USB_DT_SS_HUB_SIZE || 393 wValue != (USB_DT_SS_HUB << 8))) { 394 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n"); 395 goto error; 396 } 397 if (hcd->speed == HCD_USB3) 398 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 399 else 400 hub_descriptor((struct usb_hub_descriptor *) buf); 401 break; 402 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 403 if (hcd->speed != HCD_USB3) 404 goto error; 405 406 if ((wValue >> 8) != USB_DT_BOS) 407 goto error; 408 409 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 410 retval = sizeof(usb3_bos_desc); 411 break; 412 case GetHubStatus: 413 usbip_dbg_vhci_rh(" GetHubStatus\n"); 414 *(__le32 *) buf = cpu_to_le32(0); 415 break; 416 case GetPortStatus: 417 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex); 418 if (wIndex < 1) { 419 pr_err("invalid port number %d\n", wIndex); 420 retval = -EPIPE; 421 } 422 423 /* we do not care about resume. */ 424 425 /* whoever resets or resumes must GetPortStatus to 426 * complete it!! 427 */ 428 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) { 429 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND); 430 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND); 431 vhci_hcd->resuming = 0; 432 vhci_hcd->re_timeout = 0; 433 } 434 435 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) != 436 0 && time_after(jiffies, vhci_hcd->re_timeout)) { 437 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET); 438 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET); 439 vhci_hcd->re_timeout = 0; 440 441 if (vhci_hcd->vdev[rhport].ud.status == 442 VDEV_ST_NOTASSIGNED) { 443 usbip_dbg_vhci_rh( 444 " enable rhport %d (status %u)\n", 445 rhport, 446 vhci_hcd->vdev[rhport].ud.status); 447 vhci_hcd->port_status[rhport] |= 448 USB_PORT_STAT_ENABLE; 449 } 450 451 if (hcd->speed < HCD_USB3) { 452 switch (vhci_hcd->vdev[rhport].speed) { 453 case USB_SPEED_HIGH: 454 vhci_hcd->port_status[rhport] |= 455 USB_PORT_STAT_HIGH_SPEED; 456 break; 457 case USB_SPEED_LOW: 458 vhci_hcd->port_status[rhport] |= 459 USB_PORT_STAT_LOW_SPEED; 460 break; 461 default: 462 pr_err("vhci_device speed not set\n"); 463 break; 464 } 465 } 466 } 467 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]); 468 ((__le16 *) buf)[1] = 469 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16); 470 471 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0], 472 ((u16 *)buf)[1]); 473 break; 474 case SetHubFeature: 475 usbip_dbg_vhci_rh(" SetHubFeature\n"); 476 retval = -EPIPE; 477 break; 478 case SetPortFeature: 479 switch (wValue) { 480 case USB_PORT_FEAT_LINK_STATE: 481 usbip_dbg_vhci_rh( 482 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n"); 483 if (hcd->speed != HCD_USB3) { 484 pr_err("USB_PORT_FEAT_LINK_STATE req not " 485 "supported for USB 2.0 roothub\n"); 486 goto error; 487 } 488 /* 489 * Since this is dummy we don't have an actual link so 490 * there is nothing to do for the SET_LINK_STATE cmd 491 */ 492 break; 493 case USB_PORT_FEAT_U1_TIMEOUT: 494 usbip_dbg_vhci_rh( 495 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n"); 496 case USB_PORT_FEAT_U2_TIMEOUT: 497 usbip_dbg_vhci_rh( 498 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n"); 499 /* TODO: add suspend/resume support! */ 500 if (hcd->speed != HCD_USB3) { 501 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not " 502 "supported for USB 2.0 roothub\n"); 503 goto error; 504 } 505 break; 506 case USB_PORT_FEAT_SUSPEND: 507 usbip_dbg_vhci_rh( 508 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n"); 509 /* Applicable only for USB2.0 hub */ 510 if (hcd->speed == HCD_USB3) { 511 pr_err("USB_PORT_FEAT_SUSPEND req not " 512 "supported for USB 3.0 roothub\n"); 513 goto error; 514 } 515 516 if (rhport < 0) 517 goto error; 518 519 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND; 520 break; 521 case USB_PORT_FEAT_POWER: 522 usbip_dbg_vhci_rh( 523 " SetPortFeature: USB_PORT_FEAT_POWER\n"); 524 if (rhport < 0) 525 goto error; 526 if (hcd->speed == HCD_USB3) 527 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER; 528 else 529 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER; 530 break; 531 case USB_PORT_FEAT_BH_PORT_RESET: 532 usbip_dbg_vhci_rh( 533 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n"); 534 if (rhport < 0) 535 goto error; 536 /* Applicable only for USB3.0 hub */ 537 if (hcd->speed != HCD_USB3) { 538 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not " 539 "supported for USB 2.0 roothub\n"); 540 goto error; 541 } 542 /* FALLS THROUGH */ 543 case USB_PORT_FEAT_RESET: 544 usbip_dbg_vhci_rh( 545 " SetPortFeature: USB_PORT_FEAT_RESET\n"); 546 if (rhport < 0) 547 goto error; 548 /* if it's already enabled, disable */ 549 if (hcd->speed == HCD_USB3) { 550 vhci_hcd->port_status[rhport] = 0; 551 vhci_hcd->port_status[rhport] = 552 (USB_SS_PORT_STAT_POWER | 553 USB_PORT_STAT_CONNECTION | 554 USB_PORT_STAT_RESET); 555 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) { 556 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE 557 | USB_PORT_STAT_LOW_SPEED 558 | USB_PORT_STAT_HIGH_SPEED); 559 } 560 561 /* 50msec reset signaling */ 562 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 563 564 /* FALLS THROUGH */ 565 default: 566 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n", 567 wValue); 568 if (rhport < 0) 569 goto error; 570 if (hcd->speed == HCD_USB3) { 571 if ((vhci_hcd->port_status[rhport] & 572 USB_SS_PORT_STAT_POWER) != 0) { 573 vhci_hcd->port_status[rhport] |= (1 << wValue); 574 } 575 } else 576 if ((vhci_hcd->port_status[rhport] & 577 USB_PORT_STAT_POWER) != 0) { 578 vhci_hcd->port_status[rhport] |= (1 << wValue); 579 } 580 } 581 break; 582 case GetPortErrorCount: 583 usbip_dbg_vhci_rh(" GetPortErrorCount\n"); 584 if (hcd->speed != HCD_USB3) { 585 pr_err("GetPortErrorCount req not " 586 "supported for USB 2.0 roothub\n"); 587 goto error; 588 } 589 /* We'll always return 0 since this is a dummy hub */ 590 *(__le32 *) buf = cpu_to_le32(0); 591 break; 592 case SetHubDepth: 593 usbip_dbg_vhci_rh(" SetHubDepth\n"); 594 if (hcd->speed != HCD_USB3) { 595 pr_err("SetHubDepth req not supported for " 596 "USB 2.0 roothub\n"); 597 goto error; 598 } 599 break; 600 default: 601 pr_err("default hub control req: %04x v%04x i%04x l%d\n", 602 typeReq, wValue, wIndex, wLength); 603 error: 604 /* "protocol stall" on error */ 605 retval = -EPIPE; 606 } 607 608 if (usbip_dbg_flag_vhci_rh) { 609 pr_debug("port %d\n", rhport); 610 /* Only dump valid port status */ 611 if (rhport >= 0) { 612 dump_port_status_diff(prev_port_status[rhport], 613 vhci_hcd->port_status[rhport], 614 hcd->speed == HCD_USB3); 615 } 616 } 617 usbip_dbg_vhci_rh(" bye\n"); 618 619 spin_unlock_irqrestore(&vhci->lock, flags); 620 621 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) 622 usb_hcd_poll_rh_status(hcd); 623 624 return retval; 625 } 626 627 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev) 628 { 629 struct vhci_priv *priv; 630 struct vhci_hcd *vhci_hcd; 631 unsigned long flags; 632 633 if (!vdev) { 634 pr_err("could not get virtual device"); 635 return; 636 } 637 vhci_hcd = vdev_to_vhci_hcd(vdev); 638 639 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC); 640 if (!priv) { 641 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 642 return; 643 } 644 645 spin_lock_irqsave(&vdev->priv_lock, flags); 646 647 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 648 if (priv->seqnum == 0xffff) 649 dev_info(&urb->dev->dev, "seqnum max\n"); 650 651 priv->vdev = vdev; 652 priv->urb = urb; 653 654 urb->hcpriv = (void *) priv; 655 656 list_add_tail(&priv->list, &vdev->priv_tx); 657 658 wake_up(&vdev->waitq_tx); 659 spin_unlock_irqrestore(&vdev->priv_lock, flags); 660 } 661 662 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 663 { 664 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 665 struct vhci *vhci = vhci_hcd->vhci; 666 struct device *dev = &urb->dev->dev; 667 u8 portnum = urb->dev->portnum; 668 int ret = 0; 669 struct vhci_device *vdev; 670 unsigned long flags; 671 672 if (portnum > VHCI_HC_PORTS) { 673 pr_err("invalid port number %d\n", portnum); 674 return -ENODEV; 675 } 676 vdev = &vhci_hcd->vdev[portnum-1]; 677 678 /* patch to usb_sg_init() is in 2.5.60 */ 679 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length); 680 681 spin_lock_irqsave(&vhci->lock, flags); 682 683 if (urb->status != -EINPROGRESS) { 684 dev_err(dev, "URB already unlinked!, status %d\n", urb->status); 685 spin_unlock_irqrestore(&vhci->lock, flags); 686 return urb->status; 687 } 688 689 /* refuse enqueue for dead connection */ 690 spin_lock(&vdev->ud.lock); 691 if (vdev->ud.status == VDEV_ST_NULL || 692 vdev->ud.status == VDEV_ST_ERROR) { 693 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport); 694 spin_unlock(&vdev->ud.lock); 695 spin_unlock_irqrestore(&vhci->lock, flags); 696 return -ENODEV; 697 } 698 spin_unlock(&vdev->ud.lock); 699 700 ret = usb_hcd_link_urb_to_ep(hcd, urb); 701 if (ret) 702 goto no_need_unlink; 703 704 /* 705 * The enumeration process is as follows; 706 * 707 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0) 708 * to get max packet length of default pipe 709 * 710 * 2. Set_Address request to DevAddr(0) EndPoint(0) 711 * 712 */ 713 if (usb_pipedevice(urb->pipe) == 0) { 714 __u8 type = usb_pipetype(urb->pipe); 715 struct usb_ctrlrequest *ctrlreq = 716 (struct usb_ctrlrequest *) urb->setup_packet; 717 718 if (type != PIPE_CONTROL || !ctrlreq) { 719 dev_err(dev, "invalid request to devnum 0\n"); 720 ret = -EINVAL; 721 goto no_need_xmit; 722 } 723 724 switch (ctrlreq->bRequest) { 725 case USB_REQ_SET_ADDRESS: 726 /* set_address may come when a device is reset */ 727 dev_info(dev, "SetAddress Request (%d) to port %d\n", 728 ctrlreq->wValue, vdev->rhport); 729 730 usb_put_dev(vdev->udev); 731 vdev->udev = usb_get_dev(urb->dev); 732 733 spin_lock(&vdev->ud.lock); 734 vdev->ud.status = VDEV_ST_USED; 735 spin_unlock(&vdev->ud.lock); 736 737 if (urb->status == -EINPROGRESS) { 738 /* This request is successfully completed. */ 739 /* If not -EINPROGRESS, possibly unlinked. */ 740 urb->status = 0; 741 } 742 743 goto no_need_xmit; 744 745 case USB_REQ_GET_DESCRIPTOR: 746 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8)) 747 usbip_dbg_vhci_hc( 748 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n"); 749 750 usb_put_dev(vdev->udev); 751 vdev->udev = usb_get_dev(urb->dev); 752 goto out; 753 754 default: 755 /* NOT REACHED */ 756 dev_err(dev, 757 "invalid request to devnum 0 bRequest %u, wValue %u\n", 758 ctrlreq->bRequest, 759 ctrlreq->wValue); 760 ret = -EINVAL; 761 goto no_need_xmit; 762 } 763 764 } 765 766 out: 767 vhci_tx_urb(urb, vdev); 768 spin_unlock_irqrestore(&vhci->lock, flags); 769 770 return 0; 771 772 no_need_xmit: 773 usb_hcd_unlink_urb_from_ep(hcd, urb); 774 no_need_unlink: 775 spin_unlock_irqrestore(&vhci->lock, flags); 776 if (!ret) 777 usb_hcd_giveback_urb(hcd, urb, urb->status); 778 return ret; 779 } 780 781 /* 782 * vhci_rx gives back the urb after receiving the reply of the urb. If an 783 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives 784 * back its urb. For the driver unlinking the urb, the content of the urb is 785 * not important, but the calling to its completion handler is important; the 786 * completion of unlinking is notified by the completion handler. 787 * 788 * 789 * CLIENT SIDE 790 * 791 * - When vhci_hcd receives RET_SUBMIT, 792 * 793 * - case 1a). the urb of the pdu is not unlinking. 794 * - normal case 795 * => just give back the urb 796 * 797 * - case 1b). the urb of the pdu is unlinking. 798 * - usbip.ko will return a reply of the unlinking request. 799 * => give back the urb now and go to case 2b). 800 * 801 * - When vhci_hcd receives RET_UNLINK, 802 * 803 * - case 2a). a submit request is still pending in vhci_hcd. 804 * - urb was really pending in usbip.ko and urb_unlink_urb() was 805 * completed there. 806 * => free a pending submit request 807 * => notify unlink completeness by giving back the urb 808 * 809 * - case 2b). a submit request is *not* pending in vhci_hcd. 810 * - urb was already given back to the core driver. 811 * => do not give back the urb 812 * 813 * 814 * SERVER SIDE 815 * 816 * - When usbip receives CMD_UNLINK, 817 * 818 * - case 3a). the urb of the unlink request is now in submission. 819 * => do usb_unlink_urb(). 820 * => after the unlink is completed, send RET_UNLINK. 821 * 822 * - case 3b). the urb of the unlink request is not in submission. 823 * - may be already completed or never be received 824 * => send RET_UNLINK 825 * 826 */ 827 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 828 { 829 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 830 struct vhci *vhci = vhci_hcd->vhci; 831 struct vhci_priv *priv; 832 struct vhci_device *vdev; 833 unsigned long flags; 834 835 spin_lock_irqsave(&vhci->lock, flags); 836 837 priv = urb->hcpriv; 838 if (!priv) { 839 /* URB was never linked! or will be soon given back by 840 * vhci_rx. */ 841 spin_unlock_irqrestore(&vhci->lock, flags); 842 return -EIDRM; 843 } 844 845 { 846 int ret = 0; 847 848 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 849 if (ret) { 850 spin_unlock_irqrestore(&vhci->lock, flags); 851 return ret; 852 } 853 } 854 855 /* send unlink request here? */ 856 vdev = priv->vdev; 857 858 if (!vdev->ud.tcp_socket) { 859 /* tcp connection is closed */ 860 spin_lock(&vdev->priv_lock); 861 862 list_del(&priv->list); 863 kfree(priv); 864 urb->hcpriv = NULL; 865 866 spin_unlock(&vdev->priv_lock); 867 868 /* 869 * If tcp connection is alive, we have sent CMD_UNLINK. 870 * vhci_rx will receive RET_UNLINK and give back the URB. 871 * Otherwise, we give back it here. 872 */ 873 usb_hcd_unlink_urb_from_ep(hcd, urb); 874 875 spin_unlock_irqrestore(&vhci->lock, flags); 876 usb_hcd_giveback_urb(hcd, urb, urb->status); 877 spin_lock_irqsave(&vhci->lock, flags); 878 879 } else { 880 /* tcp connection is alive */ 881 struct vhci_unlink *unlink; 882 883 spin_lock(&vdev->priv_lock); 884 885 /* setup CMD_UNLINK pdu */ 886 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC); 887 if (!unlink) { 888 spin_unlock(&vdev->priv_lock); 889 spin_unlock_irqrestore(&vhci->lock, flags); 890 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 891 return -ENOMEM; 892 } 893 894 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 895 if (unlink->seqnum == 0xffff) 896 pr_info("seqnum max\n"); 897 898 unlink->unlink_seqnum = priv->seqnum; 899 900 /* send cmd_unlink and try to cancel the pending URB in the 901 * peer */ 902 list_add_tail(&unlink->list, &vdev->unlink_tx); 903 wake_up(&vdev->waitq_tx); 904 905 spin_unlock(&vdev->priv_lock); 906 } 907 908 spin_unlock_irqrestore(&vhci->lock, flags); 909 910 usbip_dbg_vhci_hc("leave\n"); 911 return 0; 912 } 913 914 static void vhci_device_unlink_cleanup(struct vhci_device *vdev) 915 { 916 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 917 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd); 918 struct vhci *vhci = vhci_hcd->vhci; 919 struct vhci_unlink *unlink, *tmp; 920 unsigned long flags; 921 922 spin_lock_irqsave(&vhci->lock, flags); 923 spin_lock(&vdev->priv_lock); 924 925 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { 926 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); 927 list_del(&unlink->list); 928 kfree(unlink); 929 } 930 931 while (!list_empty(&vdev->unlink_rx)) { 932 struct urb *urb; 933 934 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink, 935 list); 936 937 /* give back URB of unanswered unlink request */ 938 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum); 939 940 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); 941 if (!urb) { 942 pr_info("the urb (seqnum %lu) was already given back\n", 943 unlink->unlink_seqnum); 944 list_del(&unlink->list); 945 kfree(unlink); 946 continue; 947 } 948 949 urb->status = -ENODEV; 950 951 usb_hcd_unlink_urb_from_ep(hcd, urb); 952 953 list_del(&unlink->list); 954 955 spin_unlock(&vdev->priv_lock); 956 spin_unlock_irqrestore(&vhci->lock, flags); 957 958 usb_hcd_giveback_urb(hcd, urb, urb->status); 959 960 spin_lock_irqsave(&vhci->lock, flags); 961 spin_lock(&vdev->priv_lock); 962 963 kfree(unlink); 964 } 965 966 spin_unlock(&vdev->priv_lock); 967 spin_unlock_irqrestore(&vhci->lock, flags); 968 } 969 970 /* 971 * The important thing is that only one context begins cleanup. 972 * This is why error handling and cleanup become simple. 973 * We do not want to consider race condition as possible. 974 */ 975 static void vhci_shutdown_connection(struct usbip_device *ud) 976 { 977 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 978 979 /* need this? see stub_dev.c */ 980 if (ud->tcp_socket) { 981 pr_debug("shutdown tcp_socket %d\n", ud->sockfd); 982 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); 983 } 984 985 /* kill threads related to this sdev */ 986 if (vdev->ud.tcp_rx) { 987 kthread_stop_put(vdev->ud.tcp_rx); 988 vdev->ud.tcp_rx = NULL; 989 } 990 if (vdev->ud.tcp_tx) { 991 kthread_stop_put(vdev->ud.tcp_tx); 992 vdev->ud.tcp_tx = NULL; 993 } 994 pr_info("stop threads\n"); 995 996 /* active connection is closed */ 997 if (vdev->ud.tcp_socket) { 998 sockfd_put(vdev->ud.tcp_socket); 999 vdev->ud.tcp_socket = NULL; 1000 vdev->ud.sockfd = -1; 1001 } 1002 pr_info("release socket\n"); 1003 1004 vhci_device_unlink_cleanup(vdev); 1005 1006 /* 1007 * rh_port_disconnect() is a trigger of ... 1008 * usb_disable_device(): 1009 * disable all the endpoints for a USB device. 1010 * usb_disable_endpoint(): 1011 * disable endpoints. pending urbs are unlinked(dequeued). 1012 * 1013 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a 1014 * detached device should release used urbs in a cleanup function (i.e. 1015 * xxx_disconnect()). Therefore, vhci_hcd does not need to release 1016 * pushed urbs and their private data in this function. 1017 * 1018 * NOTE: vhci_dequeue() must be considered carefully. When shutting down 1019 * a connection, vhci_shutdown_connection() expects vhci_dequeue() 1020 * gives back pushed urbs and frees their private data by request of 1021 * the cleanup function of a USB driver. When unlinking a urb with an 1022 * active connection, vhci_dequeue() does not give back the urb which 1023 * is actually given back by vhci_rx after receiving its return pdu. 1024 * 1025 */ 1026 rh_port_disconnect(vdev); 1027 1028 pr_info("disconnect device\n"); 1029 } 1030 1031 static void vhci_device_reset(struct usbip_device *ud) 1032 { 1033 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1034 unsigned long flags; 1035 1036 spin_lock_irqsave(&ud->lock, flags); 1037 1038 vdev->speed = 0; 1039 vdev->devid = 0; 1040 1041 usb_put_dev(vdev->udev); 1042 vdev->udev = NULL; 1043 1044 if (ud->tcp_socket) { 1045 sockfd_put(ud->tcp_socket); 1046 ud->tcp_socket = NULL; 1047 ud->sockfd = -1; 1048 } 1049 ud->status = VDEV_ST_NULL; 1050 1051 spin_unlock_irqrestore(&ud->lock, flags); 1052 } 1053 1054 static void vhci_device_unusable(struct usbip_device *ud) 1055 { 1056 unsigned long flags; 1057 1058 spin_lock_irqsave(&ud->lock, flags); 1059 ud->status = VDEV_ST_ERROR; 1060 spin_unlock_irqrestore(&ud->lock, flags); 1061 } 1062 1063 static void vhci_device_init(struct vhci_device *vdev) 1064 { 1065 memset(vdev, 0, sizeof(struct vhci_device)); 1066 1067 vdev->ud.side = USBIP_VHCI; 1068 vdev->ud.status = VDEV_ST_NULL; 1069 spin_lock_init(&vdev->ud.lock); 1070 1071 INIT_LIST_HEAD(&vdev->priv_rx); 1072 INIT_LIST_HEAD(&vdev->priv_tx); 1073 INIT_LIST_HEAD(&vdev->unlink_tx); 1074 INIT_LIST_HEAD(&vdev->unlink_rx); 1075 spin_lock_init(&vdev->priv_lock); 1076 1077 init_waitqueue_head(&vdev->waitq_tx); 1078 1079 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection; 1080 vdev->ud.eh_ops.reset = vhci_device_reset; 1081 vdev->ud.eh_ops.unusable = vhci_device_unusable; 1082 1083 usbip_start_eh(&vdev->ud); 1084 } 1085 1086 static int hcd_name_to_id(const char *name) 1087 { 1088 char *c; 1089 long val; 1090 int ret; 1091 1092 c = strchr(name, '.'); 1093 if (c == NULL) 1094 return 0; 1095 1096 ret = kstrtol(c+1, 10, &val); 1097 if (ret < 0) 1098 return ret; 1099 1100 return val; 1101 } 1102 1103 static int vhci_setup(struct usb_hcd *hcd) 1104 { 1105 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1106 if (usb_hcd_is_primary_hcd(hcd)) { 1107 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd); 1108 vhci->vhci_hcd_hs->vhci = vhci; 1109 /* 1110 * Mark the first roothub as being USB 2.0. 1111 * The USB 3.0 roothub will be registered later by 1112 * vhci_hcd_probe() 1113 */ 1114 hcd->speed = HCD_USB2; 1115 hcd->self.root_hub->speed = USB_SPEED_HIGH; 1116 } else { 1117 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd); 1118 vhci->vhci_hcd_ss->vhci = vhci; 1119 hcd->speed = HCD_USB3; 1120 hcd->self.root_hub->speed = USB_SPEED_SUPER; 1121 } 1122 return 0; 1123 } 1124 1125 static int vhci_start(struct usb_hcd *hcd) 1126 { 1127 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1128 int id, rhport; 1129 int err; 1130 1131 usbip_dbg_vhci_hc("enter vhci_start\n"); 1132 1133 if (usb_hcd_is_primary_hcd(hcd)) 1134 spin_lock_init(&vhci_hcd->vhci->lock); 1135 1136 /* initialize private data of usb_hcd */ 1137 1138 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1139 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1140 1141 vhci_device_init(vdev); 1142 vdev->rhport = rhport; 1143 } 1144 1145 atomic_set(&vhci_hcd->seqnum, 0); 1146 1147 hcd->power_budget = 0; /* no limit */ 1148 hcd->uses_new_polling = 1; 1149 1150 #ifdef CONFIG_USB_OTG 1151 hcd->self.otg_port = 1; 1152 #endif 1153 1154 id = hcd_name_to_id(hcd_name(hcd)); 1155 if (id < 0) { 1156 pr_err("invalid vhci name %s\n", hcd_name(hcd)); 1157 return -EINVAL; 1158 } 1159 1160 /* vhci_hcd is now ready to be controlled through sysfs */ 1161 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1162 err = vhci_init_attr_group(); 1163 if (err) { 1164 pr_err("init attr group\n"); 1165 return err; 1166 } 1167 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1168 if (err) { 1169 pr_err("create sysfs files\n"); 1170 vhci_finish_attr_group(); 1171 return err; 1172 } 1173 pr_info("created sysfs %s\n", hcd_name(hcd)); 1174 } 1175 1176 return 0; 1177 } 1178 1179 static void vhci_stop(struct usb_hcd *hcd) 1180 { 1181 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1182 int id, rhport; 1183 1184 usbip_dbg_vhci_hc("stop VHCI controller\n"); 1185 1186 /* 1. remove the userland interface of vhci_hcd */ 1187 id = hcd_name_to_id(hcd_name(hcd)); 1188 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1189 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1190 vhci_finish_attr_group(); 1191 } 1192 1193 /* 2. shutdown all the ports of vhci_hcd */ 1194 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1195 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1196 1197 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED); 1198 usbip_stop_eh(&vdev->ud); 1199 } 1200 } 1201 1202 static int vhci_get_frame_number(struct usb_hcd *hcd) 1203 { 1204 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n"); 1205 return 0; 1206 } 1207 1208 #ifdef CONFIG_PM 1209 1210 /* FIXME: suspend/resume */ 1211 static int vhci_bus_suspend(struct usb_hcd *hcd) 1212 { 1213 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1214 unsigned long flags; 1215 1216 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1217 1218 spin_lock_irqsave(&vhci->lock, flags); 1219 hcd->state = HC_STATE_SUSPENDED; 1220 spin_unlock_irqrestore(&vhci->lock, flags); 1221 1222 return 0; 1223 } 1224 1225 static int vhci_bus_resume(struct usb_hcd *hcd) 1226 { 1227 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1228 int rc = 0; 1229 unsigned long flags; 1230 1231 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1232 1233 spin_lock_irqsave(&vhci->lock, flags); 1234 if (!HCD_HW_ACCESSIBLE(hcd)) 1235 rc = -ESHUTDOWN; 1236 else 1237 hcd->state = HC_STATE_RUNNING; 1238 spin_unlock_irqrestore(&vhci->lock, flags); 1239 1240 return rc; 1241 } 1242 1243 #else 1244 1245 #define vhci_bus_suspend NULL 1246 #define vhci_bus_resume NULL 1247 #endif 1248 1249 /* Change a group of bulk endpoints to support multiple stream IDs */ 1250 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 1251 struct usb_host_endpoint **eps, unsigned int num_eps, 1252 unsigned int num_streams, gfp_t mem_flags) 1253 { 1254 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n"); 1255 return 0; 1256 } 1257 1258 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 1259 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 1260 struct usb_host_endpoint **eps, unsigned int num_eps, 1261 gfp_t mem_flags) 1262 { 1263 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n"); 1264 return 0; 1265 } 1266 1267 static const struct hc_driver vhci_hc_driver = { 1268 .description = driver_name, 1269 .product_desc = driver_desc, 1270 .hcd_priv_size = sizeof(struct vhci_hcd), 1271 1272 .flags = HCD_USB3 | HCD_SHARED, 1273 1274 .reset = vhci_setup, 1275 .start = vhci_start, 1276 .stop = vhci_stop, 1277 1278 .urb_enqueue = vhci_urb_enqueue, 1279 .urb_dequeue = vhci_urb_dequeue, 1280 1281 .get_frame_number = vhci_get_frame_number, 1282 1283 .hub_status_data = vhci_hub_status, 1284 .hub_control = vhci_hub_control, 1285 .bus_suspend = vhci_bus_suspend, 1286 .bus_resume = vhci_bus_resume, 1287 1288 .alloc_streams = vhci_alloc_streams, 1289 .free_streams = vhci_free_streams, 1290 }; 1291 1292 static int vhci_hcd_probe(struct platform_device *pdev) 1293 { 1294 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1295 struct usb_hcd *hcd_hs; 1296 struct usb_hcd *hcd_ss; 1297 int ret; 1298 1299 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id); 1300 1301 /* 1302 * Allocate and initialize hcd. 1303 * Our private data is also allocated automatically. 1304 */ 1305 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); 1306 if (!hcd_hs) { 1307 pr_err("create primary hcd failed\n"); 1308 return -ENOMEM; 1309 } 1310 hcd_hs->has_tt = 1; 1311 1312 /* 1313 * Finish generic HCD structure initialization and register. 1314 * Call the driver's reset() and start() routines. 1315 */ 1316 ret = usb_add_hcd(hcd_hs, 0, 0); 1317 if (ret != 0) { 1318 pr_err("usb_add_hcd hs failed %d\n", ret); 1319 goto put_usb2_hcd; 1320 } 1321 1322 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev, 1323 dev_name(&pdev->dev), hcd_hs); 1324 if (!hcd_ss) { 1325 ret = -ENOMEM; 1326 pr_err("create shared hcd failed\n"); 1327 goto remove_usb2_hcd; 1328 } 1329 1330 ret = usb_add_hcd(hcd_ss, 0, 0); 1331 if (ret) { 1332 pr_err("usb_add_hcd ss failed %d\n", ret); 1333 goto put_usb3_hcd; 1334 } 1335 1336 usbip_dbg_vhci_hc("bye\n"); 1337 return 0; 1338 1339 put_usb3_hcd: 1340 usb_put_hcd(hcd_ss); 1341 remove_usb2_hcd: 1342 usb_remove_hcd(hcd_hs); 1343 put_usb2_hcd: 1344 usb_put_hcd(hcd_hs); 1345 vhci->vhci_hcd_hs = NULL; 1346 vhci->vhci_hcd_ss = NULL; 1347 return ret; 1348 } 1349 1350 static int vhci_hcd_remove(struct platform_device *pdev) 1351 { 1352 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1353 1354 /* 1355 * Disconnects the root hub, 1356 * then reverses the effects of usb_add_hcd(), 1357 * invoking the HCD's stop() methods. 1358 */ 1359 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1360 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1361 1362 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1363 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1364 1365 vhci->vhci_hcd_hs = NULL; 1366 vhci->vhci_hcd_ss = NULL; 1367 1368 return 0; 1369 } 1370 1371 #ifdef CONFIG_PM 1372 1373 /* what should happen for USB/IP under suspend/resume? */ 1374 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state) 1375 { 1376 struct usb_hcd *hcd; 1377 struct vhci *vhci; 1378 int rhport; 1379 int connected = 0; 1380 int ret = 0; 1381 unsigned long flags; 1382 1383 dev_dbg(&pdev->dev, "%s\n", __func__); 1384 1385 hcd = platform_get_drvdata(pdev); 1386 if (!hcd) 1387 return 0; 1388 1389 vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1390 1391 spin_lock_irqsave(&vhci->lock, flags); 1392 1393 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1394 if (vhci->vhci_hcd_hs->port_status[rhport] & 1395 USB_PORT_STAT_CONNECTION) 1396 connected += 1; 1397 1398 if (vhci->vhci_hcd_ss->port_status[rhport] & 1399 USB_PORT_STAT_CONNECTION) 1400 connected += 1; 1401 } 1402 1403 spin_unlock_irqrestore(&vhci->lock, flags); 1404 1405 if (connected > 0) { 1406 dev_info(&pdev->dev, 1407 "We have %d active connection%s. Do not suspend.\n", 1408 connected, (connected == 1 ? "" : "s")); 1409 ret = -EBUSY; 1410 } else { 1411 dev_info(&pdev->dev, "suspend vhci_hcd"); 1412 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1413 } 1414 1415 return ret; 1416 } 1417 1418 static int vhci_hcd_resume(struct platform_device *pdev) 1419 { 1420 struct usb_hcd *hcd; 1421 1422 dev_dbg(&pdev->dev, "%s\n", __func__); 1423 1424 hcd = platform_get_drvdata(pdev); 1425 if (!hcd) 1426 return 0; 1427 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1428 usb_hcd_poll_rh_status(hcd); 1429 1430 return 0; 1431 } 1432 1433 #else 1434 1435 #define vhci_hcd_suspend NULL 1436 #define vhci_hcd_resume NULL 1437 1438 #endif 1439 1440 static struct platform_driver vhci_driver = { 1441 .probe = vhci_hcd_probe, 1442 .remove = vhci_hcd_remove, 1443 .suspend = vhci_hcd_suspend, 1444 .resume = vhci_hcd_resume, 1445 .driver = { 1446 .name = driver_name, 1447 }, 1448 }; 1449 1450 static void del_platform_devices(void) 1451 { 1452 struct platform_device *pdev; 1453 int i; 1454 1455 for (i = 0; i < vhci_num_controllers; i++) { 1456 pdev = vhcis[i].pdev; 1457 if (pdev != NULL) 1458 platform_device_unregister(pdev); 1459 vhcis[i].pdev = NULL; 1460 } 1461 sysfs_remove_link(&platform_bus.kobj, driver_name); 1462 } 1463 1464 static int __init vhci_hcd_init(void) 1465 { 1466 int i, ret; 1467 1468 if (usb_disabled()) 1469 return -ENODEV; 1470 1471 if (vhci_num_controllers < 1) 1472 vhci_num_controllers = 1; 1473 1474 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL); 1475 if (vhcis == NULL) 1476 return -ENOMEM; 1477 1478 for (i = 0; i < vhci_num_controllers; i++) { 1479 vhcis[i].pdev = platform_device_alloc(driver_name, i); 1480 if (!vhcis[i].pdev) { 1481 i--; 1482 while (i >= 0) 1483 platform_device_put(vhcis[i--].pdev); 1484 ret = -ENOMEM; 1485 goto err_device_alloc; 1486 } 1487 } 1488 for (i = 0; i < vhci_num_controllers; i++) { 1489 void *vhci = &vhcis[i]; 1490 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *)); 1491 if (ret) 1492 goto err_driver_register; 1493 } 1494 1495 ret = platform_driver_register(&vhci_driver); 1496 if (ret) 1497 goto err_driver_register; 1498 1499 for (i = 0; i < vhci_num_controllers; i++) { 1500 ret = platform_device_add(vhcis[i].pdev); 1501 if (ret < 0) { 1502 i--; 1503 while (i >= 0) 1504 platform_device_del(vhcis[i--].pdev); 1505 goto err_add_hcd; 1506 } 1507 } 1508 1509 return ret; 1510 1511 err_add_hcd: 1512 platform_driver_unregister(&vhci_driver); 1513 err_driver_register: 1514 for (i = 0; i < vhci_num_controllers; i++) 1515 platform_device_put(vhcis[i].pdev); 1516 err_device_alloc: 1517 kfree(vhcis); 1518 return ret; 1519 } 1520 1521 static void __exit vhci_hcd_exit(void) 1522 { 1523 del_platform_devices(); 1524 platform_driver_unregister(&vhci_driver); 1525 kfree(vhcis); 1526 } 1527 1528 module_init(vhci_hcd_init); 1529 module_exit(vhci_hcd_exit); 1530 1531 MODULE_AUTHOR(DRIVER_AUTHOR); 1532 MODULE_DESCRIPTION(DRIVER_DESC); 1533 MODULE_LICENSE("GPL"); 1534