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