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 if (portnum > VHCI_HC_PORTS) { 660 pr_err("invalid port number %d\n", portnum); 661 return -ENODEV; 662 } 663 vdev = &vhci_hcd->vdev[portnum-1]; 664 665 /* patch to usb_sg_init() is in 2.5.60 */ 666 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length); 667 668 spin_lock_irqsave(&vhci->lock, flags); 669 670 if (urb->status != -EINPROGRESS) { 671 dev_err(dev, "URB already unlinked!, status %d\n", urb->status); 672 spin_unlock_irqrestore(&vhci->lock, flags); 673 return urb->status; 674 } 675 676 /* refuse enqueue for dead connection */ 677 spin_lock(&vdev->ud.lock); 678 if (vdev->ud.status == VDEV_ST_NULL || 679 vdev->ud.status == VDEV_ST_ERROR) { 680 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport); 681 spin_unlock(&vdev->ud.lock); 682 spin_unlock_irqrestore(&vhci->lock, flags); 683 return -ENODEV; 684 } 685 spin_unlock(&vdev->ud.lock); 686 687 ret = usb_hcd_link_urb_to_ep(hcd, urb); 688 if (ret) 689 goto no_need_unlink; 690 691 /* 692 * The enumeration process is as follows; 693 * 694 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0) 695 * to get max packet length of default pipe 696 * 697 * 2. Set_Address request to DevAddr(0) EndPoint(0) 698 * 699 */ 700 if (usb_pipedevice(urb->pipe) == 0) { 701 __u8 type = usb_pipetype(urb->pipe); 702 struct usb_ctrlrequest *ctrlreq = 703 (struct usb_ctrlrequest *) urb->setup_packet; 704 705 if (type != PIPE_CONTROL || !ctrlreq) { 706 dev_err(dev, "invalid request to devnum 0\n"); 707 ret = -EINVAL; 708 goto no_need_xmit; 709 } 710 711 switch (ctrlreq->bRequest) { 712 case USB_REQ_SET_ADDRESS: 713 /* set_address may come when a device is reset */ 714 dev_info(dev, "SetAddress Request (%d) to port %d\n", 715 ctrlreq->wValue, vdev->rhport); 716 717 usb_put_dev(vdev->udev); 718 vdev->udev = usb_get_dev(urb->dev); 719 720 spin_lock(&vdev->ud.lock); 721 vdev->ud.status = VDEV_ST_USED; 722 spin_unlock(&vdev->ud.lock); 723 724 if (urb->status == -EINPROGRESS) { 725 /* This request is successfully completed. */ 726 /* If not -EINPROGRESS, possibly unlinked. */ 727 urb->status = 0; 728 } 729 730 goto no_need_xmit; 731 732 case USB_REQ_GET_DESCRIPTOR: 733 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8)) 734 usbip_dbg_vhci_hc( 735 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n"); 736 737 usb_put_dev(vdev->udev); 738 vdev->udev = usb_get_dev(urb->dev); 739 goto out; 740 741 default: 742 /* NOT REACHED */ 743 dev_err(dev, 744 "invalid request to devnum 0 bRequest %u, wValue %u\n", 745 ctrlreq->bRequest, 746 ctrlreq->wValue); 747 ret = -EINVAL; 748 goto no_need_xmit; 749 } 750 751 } 752 753 out: 754 vhci_tx_urb(urb, vdev); 755 spin_unlock_irqrestore(&vhci->lock, flags); 756 757 return 0; 758 759 no_need_xmit: 760 usb_hcd_unlink_urb_from_ep(hcd, urb); 761 no_need_unlink: 762 spin_unlock_irqrestore(&vhci->lock, flags); 763 if (!ret) 764 usb_hcd_giveback_urb(hcd, urb, urb->status); 765 return ret; 766 } 767 768 /* 769 * vhci_rx gives back the urb after receiving the reply of the urb. If an 770 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives 771 * back its urb. For the driver unlinking the urb, the content of the urb is 772 * not important, but the calling to its completion handler is important; the 773 * completion of unlinking is notified by the completion handler. 774 * 775 * 776 * CLIENT SIDE 777 * 778 * - When vhci_hcd receives RET_SUBMIT, 779 * 780 * - case 1a). the urb of the pdu is not unlinking. 781 * - normal case 782 * => just give back the urb 783 * 784 * - case 1b). the urb of the pdu is unlinking. 785 * - usbip.ko will return a reply of the unlinking request. 786 * => give back the urb now and go to case 2b). 787 * 788 * - When vhci_hcd receives RET_UNLINK, 789 * 790 * - case 2a). a submit request is still pending in vhci_hcd. 791 * - urb was really pending in usbip.ko and urb_unlink_urb() was 792 * completed there. 793 * => free a pending submit request 794 * => notify unlink completeness by giving back the urb 795 * 796 * - case 2b). a submit request is *not* pending in vhci_hcd. 797 * - urb was already given back to the core driver. 798 * => do not give back the urb 799 * 800 * 801 * SERVER SIDE 802 * 803 * - When usbip receives CMD_UNLINK, 804 * 805 * - case 3a). the urb of the unlink request is now in submission. 806 * => do usb_unlink_urb(). 807 * => after the unlink is completed, send RET_UNLINK. 808 * 809 * - case 3b). the urb of the unlink request is not in submission. 810 * - may be already completed or never be received 811 * => send RET_UNLINK 812 * 813 */ 814 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 815 { 816 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 817 struct vhci *vhci = vhci_hcd->vhci; 818 struct vhci_priv *priv; 819 struct vhci_device *vdev; 820 unsigned long flags; 821 822 spin_lock_irqsave(&vhci->lock, flags); 823 824 priv = urb->hcpriv; 825 if (!priv) { 826 /* URB was never linked! or will be soon given back by 827 * vhci_rx. */ 828 spin_unlock_irqrestore(&vhci->lock, flags); 829 return -EIDRM; 830 } 831 832 { 833 int ret = 0; 834 835 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 836 if (ret) { 837 spin_unlock_irqrestore(&vhci->lock, flags); 838 return ret; 839 } 840 } 841 842 /* send unlink request here? */ 843 vdev = priv->vdev; 844 845 if (!vdev->ud.tcp_socket) { 846 /* tcp connection is closed */ 847 spin_lock(&vdev->priv_lock); 848 849 list_del(&priv->list); 850 kfree(priv); 851 urb->hcpriv = NULL; 852 853 spin_unlock(&vdev->priv_lock); 854 855 /* 856 * If tcp connection is alive, we have sent CMD_UNLINK. 857 * vhci_rx will receive RET_UNLINK and give back the URB. 858 * Otherwise, we give back it here. 859 */ 860 usb_hcd_unlink_urb_from_ep(hcd, urb); 861 862 spin_unlock_irqrestore(&vhci->lock, flags); 863 usb_hcd_giveback_urb(hcd, urb, urb->status); 864 spin_lock_irqsave(&vhci->lock, flags); 865 866 } else { 867 /* tcp connection is alive */ 868 struct vhci_unlink *unlink; 869 870 spin_lock(&vdev->priv_lock); 871 872 /* setup CMD_UNLINK pdu */ 873 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC); 874 if (!unlink) { 875 spin_unlock(&vdev->priv_lock); 876 spin_unlock_irqrestore(&vhci->lock, flags); 877 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); 878 return -ENOMEM; 879 } 880 881 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum); 882 if (unlink->seqnum == 0xffff) 883 pr_info("seqnum max\n"); 884 885 unlink->unlink_seqnum = priv->seqnum; 886 887 /* send cmd_unlink and try to cancel the pending URB in the 888 * peer */ 889 list_add_tail(&unlink->list, &vdev->unlink_tx); 890 wake_up(&vdev->waitq_tx); 891 892 spin_unlock(&vdev->priv_lock); 893 } 894 895 spin_unlock_irqrestore(&vhci->lock, flags); 896 897 usbip_dbg_vhci_hc("leave\n"); 898 return 0; 899 } 900 901 static void vhci_device_unlink_cleanup(struct vhci_device *vdev) 902 { 903 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); 904 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd); 905 struct vhci *vhci = vhci_hcd->vhci; 906 struct vhci_unlink *unlink, *tmp; 907 unsigned long flags; 908 909 spin_lock_irqsave(&vhci->lock, flags); 910 spin_lock(&vdev->priv_lock); 911 912 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { 913 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); 914 list_del(&unlink->list); 915 kfree(unlink); 916 } 917 918 while (!list_empty(&vdev->unlink_rx)) { 919 struct urb *urb; 920 921 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink, 922 list); 923 924 /* give back URB of unanswered unlink request */ 925 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum); 926 927 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); 928 if (!urb) { 929 pr_info("the urb (seqnum %lu) was already given back\n", 930 unlink->unlink_seqnum); 931 list_del(&unlink->list); 932 kfree(unlink); 933 continue; 934 } 935 936 urb->status = -ENODEV; 937 938 usb_hcd_unlink_urb_from_ep(hcd, urb); 939 940 list_del(&unlink->list); 941 942 spin_unlock(&vdev->priv_lock); 943 spin_unlock_irqrestore(&vhci->lock, flags); 944 945 usb_hcd_giveback_urb(hcd, urb, urb->status); 946 947 spin_lock_irqsave(&vhci->lock, flags); 948 spin_lock(&vdev->priv_lock); 949 950 kfree(unlink); 951 } 952 953 spin_unlock(&vdev->priv_lock); 954 spin_unlock_irqrestore(&vhci->lock, flags); 955 } 956 957 /* 958 * The important thing is that only one context begins cleanup. 959 * This is why error handling and cleanup become simple. 960 * We do not want to consider race condition as possible. 961 */ 962 static void vhci_shutdown_connection(struct usbip_device *ud) 963 { 964 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 965 966 /* need this? see stub_dev.c */ 967 if (ud->tcp_socket) { 968 pr_debug("shutdown tcp_socket %d\n", ud->sockfd); 969 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); 970 } 971 972 /* kill threads related to this sdev */ 973 if (vdev->ud.tcp_rx) { 974 kthread_stop_put(vdev->ud.tcp_rx); 975 vdev->ud.tcp_rx = NULL; 976 } 977 if (vdev->ud.tcp_tx) { 978 kthread_stop_put(vdev->ud.tcp_tx); 979 vdev->ud.tcp_tx = NULL; 980 } 981 pr_info("stop threads\n"); 982 983 /* active connection is closed */ 984 if (vdev->ud.tcp_socket) { 985 sockfd_put(vdev->ud.tcp_socket); 986 vdev->ud.tcp_socket = NULL; 987 vdev->ud.sockfd = -1; 988 } 989 pr_info("release socket\n"); 990 991 vhci_device_unlink_cleanup(vdev); 992 993 /* 994 * rh_port_disconnect() is a trigger of ... 995 * usb_disable_device(): 996 * disable all the endpoints for a USB device. 997 * usb_disable_endpoint(): 998 * disable endpoints. pending urbs are unlinked(dequeued). 999 * 1000 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a 1001 * detached device should release used urbs in a cleanup function (i.e. 1002 * xxx_disconnect()). Therefore, vhci_hcd does not need to release 1003 * pushed urbs and their private data in this function. 1004 * 1005 * NOTE: vhci_dequeue() must be considered carefully. When shutting down 1006 * a connection, vhci_shutdown_connection() expects vhci_dequeue() 1007 * gives back pushed urbs and frees their private data by request of 1008 * the cleanup function of a USB driver. When unlinking a urb with an 1009 * active connection, vhci_dequeue() does not give back the urb which 1010 * is actually given back by vhci_rx after receiving its return pdu. 1011 * 1012 */ 1013 rh_port_disconnect(vdev); 1014 1015 pr_info("disconnect device\n"); 1016 } 1017 1018 static void vhci_device_reset(struct usbip_device *ud) 1019 { 1020 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 1021 unsigned long flags; 1022 1023 spin_lock_irqsave(&ud->lock, flags); 1024 1025 vdev->speed = 0; 1026 vdev->devid = 0; 1027 1028 usb_put_dev(vdev->udev); 1029 vdev->udev = NULL; 1030 1031 if (ud->tcp_socket) { 1032 sockfd_put(ud->tcp_socket); 1033 ud->tcp_socket = NULL; 1034 ud->sockfd = -1; 1035 } 1036 ud->status = VDEV_ST_NULL; 1037 1038 spin_unlock_irqrestore(&ud->lock, flags); 1039 } 1040 1041 static void vhci_device_unusable(struct usbip_device *ud) 1042 { 1043 unsigned long flags; 1044 1045 spin_lock_irqsave(&ud->lock, flags); 1046 ud->status = VDEV_ST_ERROR; 1047 spin_unlock_irqrestore(&ud->lock, flags); 1048 } 1049 1050 static void vhci_device_init(struct vhci_device *vdev) 1051 { 1052 memset(vdev, 0, sizeof(struct vhci_device)); 1053 1054 vdev->ud.side = USBIP_VHCI; 1055 vdev->ud.status = VDEV_ST_NULL; 1056 spin_lock_init(&vdev->ud.lock); 1057 1058 INIT_LIST_HEAD(&vdev->priv_rx); 1059 INIT_LIST_HEAD(&vdev->priv_tx); 1060 INIT_LIST_HEAD(&vdev->unlink_tx); 1061 INIT_LIST_HEAD(&vdev->unlink_rx); 1062 spin_lock_init(&vdev->priv_lock); 1063 1064 init_waitqueue_head(&vdev->waitq_tx); 1065 1066 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection; 1067 vdev->ud.eh_ops.reset = vhci_device_reset; 1068 vdev->ud.eh_ops.unusable = vhci_device_unusable; 1069 1070 usbip_start_eh(&vdev->ud); 1071 } 1072 1073 static int hcd_name_to_id(const char *name) 1074 { 1075 char *c; 1076 long val; 1077 int ret; 1078 1079 c = strchr(name, '.'); 1080 if (c == NULL) 1081 return 0; 1082 1083 ret = kstrtol(c+1, 10, &val); 1084 if (ret < 0) 1085 return ret; 1086 1087 return val; 1088 } 1089 1090 static int vhci_setup(struct usb_hcd *hcd) 1091 { 1092 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1093 if (usb_hcd_is_primary_hcd(hcd)) { 1094 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd); 1095 vhci->vhci_hcd_hs->vhci = vhci; 1096 /* 1097 * Mark the first roothub as being USB 2.0. 1098 * The USB 3.0 roothub will be registered later by 1099 * vhci_hcd_probe() 1100 */ 1101 hcd->speed = HCD_USB2; 1102 hcd->self.root_hub->speed = USB_SPEED_HIGH; 1103 } else { 1104 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd); 1105 vhci->vhci_hcd_ss->vhci = vhci; 1106 hcd->speed = HCD_USB3; 1107 hcd->self.root_hub->speed = USB_SPEED_SUPER; 1108 } 1109 return 0; 1110 } 1111 1112 static int vhci_start(struct usb_hcd *hcd) 1113 { 1114 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1115 int id, rhport; 1116 int err; 1117 1118 usbip_dbg_vhci_hc("enter vhci_start\n"); 1119 1120 if (usb_hcd_is_primary_hcd(hcd)) 1121 spin_lock_init(&vhci_hcd->vhci->lock); 1122 1123 /* initialize private data of usb_hcd */ 1124 1125 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1126 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1127 1128 vhci_device_init(vdev); 1129 vdev->rhport = rhport; 1130 } 1131 1132 atomic_set(&vhci_hcd->seqnum, 0); 1133 1134 hcd->power_budget = 0; /* no limit */ 1135 hcd->uses_new_polling = 1; 1136 1137 #ifdef CONFIG_USB_OTG 1138 hcd->self.otg_port = 1; 1139 #endif 1140 1141 id = hcd_name_to_id(hcd_name(hcd)); 1142 if (id < 0) { 1143 pr_err("invalid vhci name %s\n", hcd_name(hcd)); 1144 return -EINVAL; 1145 } 1146 1147 /* vhci_hcd is now ready to be controlled through sysfs */ 1148 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1149 err = vhci_init_attr_group(); 1150 if (err) { 1151 pr_err("init attr group\n"); 1152 return err; 1153 } 1154 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1155 if (err) { 1156 pr_err("create sysfs files\n"); 1157 vhci_finish_attr_group(); 1158 return err; 1159 } 1160 pr_info("created sysfs %s\n", hcd_name(hcd)); 1161 } 1162 1163 return 0; 1164 } 1165 1166 static void vhci_stop(struct usb_hcd *hcd) 1167 { 1168 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd); 1169 int id, rhport; 1170 1171 usbip_dbg_vhci_hc("stop VHCI controller\n"); 1172 1173 /* 1. remove the userland interface of vhci_hcd */ 1174 id = hcd_name_to_id(hcd_name(hcd)); 1175 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) { 1176 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group); 1177 vhci_finish_attr_group(); 1178 } 1179 1180 /* 2. shutdown all the ports of vhci_hcd */ 1181 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1182 struct vhci_device *vdev = &vhci_hcd->vdev[rhport]; 1183 1184 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED); 1185 usbip_stop_eh(&vdev->ud); 1186 } 1187 } 1188 1189 static int vhci_get_frame_number(struct usb_hcd *hcd) 1190 { 1191 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n"); 1192 return 0; 1193 } 1194 1195 #ifdef CONFIG_PM 1196 1197 /* FIXME: suspend/resume */ 1198 static int vhci_bus_suspend(struct usb_hcd *hcd) 1199 { 1200 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1201 unsigned long flags; 1202 1203 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1204 1205 spin_lock_irqsave(&vhci->lock, flags); 1206 hcd->state = HC_STATE_SUSPENDED; 1207 spin_unlock_irqrestore(&vhci->lock, flags); 1208 1209 return 0; 1210 } 1211 1212 static int vhci_bus_resume(struct usb_hcd *hcd) 1213 { 1214 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1215 int rc = 0; 1216 unsigned long flags; 1217 1218 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 1219 1220 spin_lock_irqsave(&vhci->lock, flags); 1221 if (!HCD_HW_ACCESSIBLE(hcd)) 1222 rc = -ESHUTDOWN; 1223 else 1224 hcd->state = HC_STATE_RUNNING; 1225 spin_unlock_irqrestore(&vhci->lock, flags); 1226 1227 return rc; 1228 } 1229 1230 #else 1231 1232 #define vhci_bus_suspend NULL 1233 #define vhci_bus_resume NULL 1234 #endif 1235 1236 /* Change a group of bulk endpoints to support multiple stream IDs */ 1237 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 1238 struct usb_host_endpoint **eps, unsigned int num_eps, 1239 unsigned int num_streams, gfp_t mem_flags) 1240 { 1241 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n"); 1242 return 0; 1243 } 1244 1245 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 1246 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 1247 struct usb_host_endpoint **eps, unsigned int num_eps, 1248 gfp_t mem_flags) 1249 { 1250 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n"); 1251 return 0; 1252 } 1253 1254 static const struct hc_driver vhci_hc_driver = { 1255 .description = driver_name, 1256 .product_desc = driver_desc, 1257 .hcd_priv_size = sizeof(struct vhci_hcd), 1258 1259 .flags = HCD_USB3 | HCD_SHARED, 1260 1261 .reset = vhci_setup, 1262 .start = vhci_start, 1263 .stop = vhci_stop, 1264 1265 .urb_enqueue = vhci_urb_enqueue, 1266 .urb_dequeue = vhci_urb_dequeue, 1267 1268 .get_frame_number = vhci_get_frame_number, 1269 1270 .hub_status_data = vhci_hub_status, 1271 .hub_control = vhci_hub_control, 1272 .bus_suspend = vhci_bus_suspend, 1273 .bus_resume = vhci_bus_resume, 1274 1275 .alloc_streams = vhci_alloc_streams, 1276 .free_streams = vhci_free_streams, 1277 }; 1278 1279 static int vhci_hcd_probe(struct platform_device *pdev) 1280 { 1281 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1282 struct usb_hcd *hcd_hs; 1283 struct usb_hcd *hcd_ss; 1284 int ret; 1285 1286 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id); 1287 1288 /* 1289 * Allocate and initialize hcd. 1290 * Our private data is also allocated automatically. 1291 */ 1292 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); 1293 if (!hcd_hs) { 1294 pr_err("create primary hcd failed\n"); 1295 return -ENOMEM; 1296 } 1297 hcd_hs->has_tt = 1; 1298 1299 /* 1300 * Finish generic HCD structure initialization and register. 1301 * Call the driver's reset() and start() routines. 1302 */ 1303 ret = usb_add_hcd(hcd_hs, 0, 0); 1304 if (ret != 0) { 1305 pr_err("usb_add_hcd hs failed %d\n", ret); 1306 goto put_usb2_hcd; 1307 } 1308 1309 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev, 1310 dev_name(&pdev->dev), hcd_hs); 1311 if (!hcd_ss) { 1312 ret = -ENOMEM; 1313 pr_err("create shared hcd failed\n"); 1314 goto remove_usb2_hcd; 1315 } 1316 1317 ret = usb_add_hcd(hcd_ss, 0, 0); 1318 if (ret) { 1319 pr_err("usb_add_hcd ss failed %d\n", ret); 1320 goto put_usb3_hcd; 1321 } 1322 1323 usbip_dbg_vhci_hc("bye\n"); 1324 return 0; 1325 1326 put_usb3_hcd: 1327 usb_put_hcd(hcd_ss); 1328 remove_usb2_hcd: 1329 usb_remove_hcd(hcd_hs); 1330 put_usb2_hcd: 1331 usb_put_hcd(hcd_hs); 1332 vhci->vhci_hcd_hs = NULL; 1333 vhci->vhci_hcd_ss = NULL; 1334 return ret; 1335 } 1336 1337 static int vhci_hcd_remove(struct platform_device *pdev) 1338 { 1339 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev)); 1340 1341 /* 1342 * Disconnects the root hub, 1343 * then reverses the effects of usb_add_hcd(), 1344 * invoking the HCD's stop() methods. 1345 */ 1346 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1347 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss)); 1348 1349 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1350 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs)); 1351 1352 vhci->vhci_hcd_hs = NULL; 1353 vhci->vhci_hcd_ss = NULL; 1354 1355 return 0; 1356 } 1357 1358 #ifdef CONFIG_PM 1359 1360 /* what should happen for USB/IP under suspend/resume? */ 1361 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state) 1362 { 1363 struct usb_hcd *hcd; 1364 struct vhci *vhci; 1365 int rhport; 1366 int connected = 0; 1367 int ret = 0; 1368 unsigned long flags; 1369 1370 dev_dbg(&pdev->dev, "%s\n", __func__); 1371 1372 hcd = platform_get_drvdata(pdev); 1373 if (!hcd) 1374 return 0; 1375 1376 vhci = *((void **)dev_get_platdata(hcd->self.controller)); 1377 1378 spin_lock_irqsave(&vhci->lock, flags); 1379 1380 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) { 1381 if (vhci->vhci_hcd_hs->port_status[rhport] & 1382 USB_PORT_STAT_CONNECTION) 1383 connected += 1; 1384 1385 if (vhci->vhci_hcd_ss->port_status[rhport] & 1386 USB_PORT_STAT_CONNECTION) 1387 connected += 1; 1388 } 1389 1390 spin_unlock_irqrestore(&vhci->lock, flags); 1391 1392 if (connected > 0) { 1393 dev_info(&pdev->dev, 1394 "We have %d active connection%s. Do not suspend.\n", 1395 connected, (connected == 1 ? "" : "s")); 1396 ret = -EBUSY; 1397 } else { 1398 dev_info(&pdev->dev, "suspend vhci_hcd"); 1399 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1400 } 1401 1402 return ret; 1403 } 1404 1405 static int vhci_hcd_resume(struct platform_device *pdev) 1406 { 1407 struct usb_hcd *hcd; 1408 1409 dev_dbg(&pdev->dev, "%s\n", __func__); 1410 1411 hcd = platform_get_drvdata(pdev); 1412 if (!hcd) 1413 return 0; 1414 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 1415 usb_hcd_poll_rh_status(hcd); 1416 1417 return 0; 1418 } 1419 1420 #else 1421 1422 #define vhci_hcd_suspend NULL 1423 #define vhci_hcd_resume NULL 1424 1425 #endif 1426 1427 static struct platform_driver vhci_driver = { 1428 .probe = vhci_hcd_probe, 1429 .remove = vhci_hcd_remove, 1430 .suspend = vhci_hcd_suspend, 1431 .resume = vhci_hcd_resume, 1432 .driver = { 1433 .name = driver_name, 1434 }, 1435 }; 1436 1437 static void del_platform_devices(void) 1438 { 1439 struct platform_device *pdev; 1440 int i; 1441 1442 for (i = 0; i < vhci_num_controllers; i++) { 1443 pdev = vhcis[i].pdev; 1444 if (pdev != NULL) 1445 platform_device_unregister(pdev); 1446 vhcis[i].pdev = NULL; 1447 } 1448 sysfs_remove_link(&platform_bus.kobj, driver_name); 1449 } 1450 1451 static int __init vhci_hcd_init(void) 1452 { 1453 int i, ret; 1454 1455 if (usb_disabled()) 1456 return -ENODEV; 1457 1458 if (vhci_num_controllers < 1) 1459 vhci_num_controllers = 1; 1460 1461 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL); 1462 if (vhcis == NULL) 1463 return -ENOMEM; 1464 1465 for (i = 0; i < vhci_num_controllers; i++) { 1466 vhcis[i].pdev = platform_device_alloc(driver_name, i); 1467 if (!vhcis[i].pdev) { 1468 i--; 1469 while (i >= 0) 1470 platform_device_put(vhcis[i--].pdev); 1471 ret = -ENOMEM; 1472 goto err_device_alloc; 1473 } 1474 } 1475 for (i = 0; i < vhci_num_controllers; i++) { 1476 void *vhci = &vhcis[i]; 1477 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *)); 1478 if (ret) 1479 goto err_driver_register; 1480 } 1481 1482 ret = platform_driver_register(&vhci_driver); 1483 if (ret) 1484 goto err_driver_register; 1485 1486 for (i = 0; i < vhci_num_controllers; i++) { 1487 ret = platform_device_add(vhcis[i].pdev); 1488 if (ret < 0) { 1489 i--; 1490 while (i >= 0) 1491 platform_device_del(vhcis[i--].pdev); 1492 goto err_add_hcd; 1493 } 1494 } 1495 1496 return ret; 1497 1498 err_add_hcd: 1499 platform_driver_unregister(&vhci_driver); 1500 err_driver_register: 1501 for (i = 0; i < vhci_num_controllers; i++) 1502 platform_device_put(vhcis[i].pdev); 1503 err_device_alloc: 1504 kfree(vhcis); 1505 return ret; 1506 } 1507 1508 static void __exit vhci_hcd_exit(void) 1509 { 1510 del_platform_devices(); 1511 platform_driver_unregister(&vhci_driver); 1512 kfree(vhcis); 1513 } 1514 1515 module_init(vhci_hcd_init); 1516 module_exit(vhci_hcd_exit); 1517 1518 MODULE_AUTHOR(DRIVER_AUTHOR); 1519 MODULE_DESCRIPTION(DRIVER_DESC); 1520 MODULE_LICENSE("GPL"); 1521