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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / usb / usbip / vhci_hcd.c
blob65850e9c719055218545d07505f9febe75810066
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * Copyright (C) 2015-2016 Nobuo Iwata
5 */
6
7 #include <linux/init.h>
8 #include <linux/file.h>
9 #include <linux/kernel.h>
10 #include <linux/kthread.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14
15 #include "usbip_common.h"
16 #include "vhci.h"
17
18 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
19 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
20
21 /*
22 * TODO
23 * - update root hub emulation
24 * - move the emulation code to userland ?
25 * porting to other operating systems
26 * minimize kernel code
27 * - add suspend/resume code
28 * - clean up everything
29 */
30
31 /* See usb gadget dummy hcd */
32
33 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
34 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
35 u16 wIndex, char *buff, u16 wLength);
36 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
37 gfp_t mem_flags);
38 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
39 static int vhci_start(struct usb_hcd *vhci_hcd);
40 static void vhci_stop(struct usb_hcd *hcd);
41 static int vhci_get_frame_number(struct usb_hcd *hcd);
42
43 static const char driver_name[] = "vhci_hcd";
44 static const char driver_desc[] = "USB/IP Virtual Host Controller";
45
46 int vhci_num_controllers = VHCI_NR_HCS;
47 struct vhci *vhcis;
48
49 static const char * const bit_desc[] = {
50 "CONNECTION", /*0*/
51 "ENABLE", /*1*/
52 "SUSPEND", /*2*/
53 "OVER_CURRENT", /*3*/
54 "RESET", /*4*/
55 "L1", /*5*/
56 "R6", /*6*/
57 "R7", /*7*/
58 "POWER", /*8*/
59 "LOWSPEED", /*9*/
60 "HIGHSPEED", /*10*/
61 "PORT_TEST", /*11*/
62 "INDICATOR", /*12*/
63 "R13", /*13*/
64 "R14", /*14*/
65 "R15", /*15*/
66 "C_CONNECTION", /*16*/
67 "C_ENABLE", /*17*/
68 "C_SUSPEND", /*18*/
69 "C_OVER_CURRENT", /*19*/
70 "C_RESET", /*20*/
71 "C_L1", /*21*/
72 "R22", /*22*/
73 "R23", /*23*/
74 "R24", /*24*/
75 "R25", /*25*/
76 "R26", /*26*/
77 "R27", /*27*/
78 "R28", /*28*/
79 "R29", /*29*/
80 "R30", /*30*/
81 "R31", /*31*/
82 };
83
84 static const char * const bit_desc_ss[] = {
85 "CONNECTION", /*0*/
86 "ENABLE", /*1*/
87 "SUSPEND", /*2*/
88 "OVER_CURRENT", /*3*/
89 "RESET", /*4*/
90 "L1", /*5*/
91 "R6", /*6*/
92 "R7", /*7*/
93 "R8", /*8*/
94 "POWER", /*9*/
95 "HIGHSPEED", /*10*/
96 "PORT_TEST", /*11*/
97 "INDICATOR", /*12*/
98 "R13", /*13*/
99 "R14", /*14*/
100 "R15", /*15*/
101 "C_CONNECTION", /*16*/
102 "C_ENABLE", /*17*/
103 "C_SUSPEND", /*18*/
104 "C_OVER_CURRENT", /*19*/
105 "C_RESET", /*20*/
106 "C_BH_RESET", /*21*/
107 "C_LINK_STATE", /*22*/
108 "C_CONFIG_ERROR", /*23*/
109 "R24", /*24*/
110 "R25", /*25*/
111 "R26", /*26*/
112 "R27", /*27*/
113 "R28", /*28*/
114 "R29", /*29*/
115 "R30", /*30*/
116 "R31", /*31*/
117 };
118
119 static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3)
120 {
121 int i = 0;
122 u32 bit = 1;
123 const char * const *desc = bit_desc;
124
125 if (usb3)
126 desc = bit_desc_ss;
127
128 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
129 while (bit) {
130 u32 prev = prev_status & bit;
131 u32 new = new_status & bit;
132 char change;
133
134 if (!prev && new)
135 change = '+';
136 else if (prev && !new)
137 change = '-';
138 else
139 change = ' ';
140
141 if (prev || new) {
142 pr_debug(" %c%s\n", change, desc[i]);
143
144 if (bit == 1) /* USB_PORT_STAT_CONNECTION */
145 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS");
146 }
147 bit <<= 1;
148 i++;
149 }
150 pr_debug("\n");
151 }
152
153 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
154 {
155 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
156 struct vhci *vhci = vhci_hcd->vhci;
157 int rhport = vdev->rhport;
158 u32 status;
159 unsigned long flags;
160
161 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
162
163 spin_lock_irqsave(&vhci->lock, flags);
164
165 status = vhci_hcd->port_status[rhport];
166
167 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
168
169 switch (speed) {
170 case USB_SPEED_HIGH:
171 status |= USB_PORT_STAT_HIGH_SPEED;
172 break;
173 case USB_SPEED_LOW:
174 status |= USB_PORT_STAT_LOW_SPEED;
175 break;
176 default:
177 break;
178 }
179
180 vhci_hcd->port_status[rhport] = status;
181
182 spin_unlock_irqrestore(&vhci->lock, flags);
183
184 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
185 }
186
187 static void rh_port_disconnect(struct vhci_device *vdev)
188 {
189 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
190 struct vhci *vhci = vhci_hcd->vhci;
191 int rhport = vdev->rhport;
192 u32 status;
193 unsigned long flags;
194
195 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
196
197 spin_lock_irqsave(&vhci->lock, flags);
198
199 status = vhci_hcd->port_status[rhport];
200
201 status &= ~USB_PORT_STAT_CONNECTION;
202 status |= (1 << USB_PORT_FEAT_C_CONNECTION);
203
204 vhci_hcd->port_status[rhport] = status;
205
206 spin_unlock_irqrestore(&vhci->lock, flags);
207 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
208 }
209
210 #define PORT_C_MASK \
211 ((USB_PORT_STAT_C_CONNECTION \
212 | USB_PORT_STAT_C_ENABLE \
213 | USB_PORT_STAT_C_SUSPEND \
214 | USB_PORT_STAT_C_OVERCURRENT \
215 | USB_PORT_STAT_C_RESET) << 16)
216
217 /*
218 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
219 * Ports are 0-indexed from the HCD point of view,
220 * and 1-indexed from the USB core pointer of view.
221 *
222 * @buf: a bitmap to show which port status has been changed.
223 * bit 0: reserved
224 * bit 1: the status of port 0 has been changed.
225 * bit 2: the status of port 1 has been changed.
226 * ...
227 */
228 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
229 {
230 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
231 struct vhci *vhci = vhci_hcd->vhci;
232 int retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
233 int rhport;
234 int changed = 0;
235 unsigned long flags;
236
237 memset(buf, 0, retval);
238
239 spin_lock_irqsave(&vhci->lock, flags);
240 if (!HCD_HW_ACCESSIBLE(hcd)) {
241 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
242 goto done;
243 }
244
245 /* check pseudo status register for each port */
246 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
247 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) {
248 /* The status of a port has been changed, */
249 usbip_dbg_vhci_rh("port %d status changed\n", rhport);
250
251 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
252 changed = 1;
253 }
254 }
255
256 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
257 usb_hcd_resume_root_hub(hcd);
258
259 done:
260 spin_unlock_irqrestore(&vhci->lock, flags);
261 return changed ? retval : 0;
262 }
263
264 /* usb 3.0 root hub device descriptor */
265 static struct {
266 struct usb_bos_descriptor bos;
267 struct usb_ss_cap_descriptor ss_cap;
268 } __packed usb3_bos_desc = {
269
270 .bos = {
271 .bLength = USB_DT_BOS_SIZE,
272 .bDescriptorType = USB_DT_BOS,
273 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
274 .bNumDeviceCaps = 1,
275 },
276 .ss_cap = {
277 .bLength = USB_DT_USB_SS_CAP_SIZE,
278 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
279 .bDevCapabilityType = USB_SS_CAP_TYPE,
280 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
281 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
282 },
283 };
284
285 static inline void
286 ss_hub_descriptor(struct usb_hub_descriptor *desc)
287 {
288 memset(desc, 0, sizeof *desc);
289 desc->bDescriptorType = USB_DT_SS_HUB;
290 desc->bDescLength = 12;
291 desc->wHubCharacteristics = cpu_to_le16(
292 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
293 desc->bNbrPorts = VHCI_HC_PORTS;
294 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
295 desc->u.ss.DeviceRemovable = 0xffff;
296 }
297
298 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
299 {
300 int width;
301
302 memset(desc, 0, sizeof(*desc));
303 desc->bDescriptorType = USB_DT_HUB;
304 desc->wHubCharacteristics = cpu_to_le16(
305 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
306
307 desc->bNbrPorts = VHCI_HC_PORTS;
308 BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
309 width = desc->bNbrPorts / 8 + 1;
310 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
311 memset(&desc->u.hs.DeviceRemovable[0], 0, width);
312 memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
313 }
314
315 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
316 u16 wIndex, char *buf, u16 wLength)
317 {
318 struct vhci_hcd *vhci_hcd;
319 struct vhci *vhci;
320 int retval = 0;
321 int rhport = -1;
322 unsigned long flags;
323 bool invalid_rhport = false;
324
325 u32 prev_port_status[VHCI_HC_PORTS];
326
327 if (!HCD_HW_ACCESSIBLE(hcd))
328 return -ETIMEDOUT;
329
330 /*
331 * NOTE:
332 * wIndex (bits 0-7) shows the port number and begins from 1?
333 */
334 wIndex = ((__u8)(wIndex & 0x00ff));
335 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
336 wIndex);
337
338 /*
339 * wIndex can be 0 for some request types (typeReq). rhport is
340 * in valid range when wIndex >= 1 and < VHCI_HC_PORTS.
341 *
342 * Reference port_status[] only with valid rhport when
343 * invalid_rhport is false.
344 */
345 if (wIndex < 1 || wIndex > VHCI_HC_PORTS) {
346 invalid_rhport = true;
347 if (wIndex > VHCI_HC_PORTS)
348 pr_err("invalid port number %d\n", wIndex);
349 } else
350 rhport = wIndex - 1;
351
352 vhci_hcd = hcd_to_vhci_hcd(hcd);
353 vhci = vhci_hcd->vhci;
354
355 spin_lock_irqsave(&vhci->lock, flags);
356
357 /* store old status and compare now and old later */
358 if (usbip_dbg_flag_vhci_rh) {
359 if (!invalid_rhport)
360 memcpy(prev_port_status, vhci_hcd->port_status,
361 sizeof(prev_port_status));
362 }
363
364 switch (typeReq) {
365 case ClearHubFeature:
366 usbip_dbg_vhci_rh(" ClearHubFeature\n");
367 break;
368 case ClearPortFeature:
369 if (invalid_rhport) {
370 pr_err("invalid port number %d\n", wIndex);
371 goto error;
372 }
373 switch (wValue) {
374 case USB_PORT_FEAT_SUSPEND:
375 if (hcd->speed == HCD_USB3) {
376 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not "
377 "supported for USB 3.0 roothub\n");
378 goto error;
379 }
380 usbip_dbg_vhci_rh(
381 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n");
382 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
383 /* 20msec signaling */
384 vhci_hcd->resuming = 1;
385 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
386 }
387 break;
388 case USB_PORT_FEAT_POWER:
389 usbip_dbg_vhci_rh(
390 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
391 if (hcd->speed == HCD_USB3)
392 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER;
393 else
394 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER;
395 break;
396 default:
397 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
398 wValue);
399 vhci_hcd->port_status[rhport] &= ~(1 << wValue);
400 break;
401 }
402 break;
403 case GetHubDescriptor:
404 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
405 if (hcd->speed == HCD_USB3 &&
406 (wLength < USB_DT_SS_HUB_SIZE ||
407 wValue != (USB_DT_SS_HUB << 8))) {
408 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n");
409 goto error;
410 }
411 if (hcd->speed == HCD_USB3)
412 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
413 else
414 hub_descriptor((struct usb_hub_descriptor *) buf);
415 break;
416 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
417 if (hcd->speed != HCD_USB3)
418 goto error;
419
420 if ((wValue >> 8) != USB_DT_BOS)
421 goto error;
422
423 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
424 retval = sizeof(usb3_bos_desc);
425 break;
426 case GetHubStatus:
427 usbip_dbg_vhci_rh(" GetHubStatus\n");
428 *(__le32 *) buf = cpu_to_le32(0);
429 break;
430 case GetPortStatus:
431 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
432 if (invalid_rhport) {
433 pr_err("invalid port number %d\n", wIndex);
434 retval = -EPIPE;
435 goto error;
436 }
437
438 /* we do not care about resume. */
439
440 /* whoever resets or resumes must GetPortStatus to
441 * complete it!!
442 */
443 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) {
444 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND);
445 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND);
446 vhci_hcd->resuming = 0;
447 vhci_hcd->re_timeout = 0;
448 }
449
450 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
451 0 && time_after(jiffies, vhci_hcd->re_timeout)) {
452 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET);
453 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET);
454 vhci_hcd->re_timeout = 0;
455
456 if (vhci_hcd->vdev[rhport].ud.status ==
457 VDEV_ST_NOTASSIGNED) {
458 usbip_dbg_vhci_rh(
459 " enable rhport %d (status %u)\n",
460 rhport,
461 vhci_hcd->vdev[rhport].ud.status);
462 vhci_hcd->port_status[rhport] |=
463 USB_PORT_STAT_ENABLE;
464 }
465
466 if (hcd->speed < HCD_USB3) {
467 switch (vhci_hcd->vdev[rhport].speed) {
468 case USB_SPEED_HIGH:
469 vhci_hcd->port_status[rhport] |=
470 USB_PORT_STAT_HIGH_SPEED;
471 break;
472 case USB_SPEED_LOW:
473 vhci_hcd->port_status[rhport] |=
474 USB_PORT_STAT_LOW_SPEED;
475 break;
476 default:
477 pr_err("vhci_device speed not set\n");
478 break;
479 }
480 }
481 }
482 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]);
483 ((__le16 *) buf)[1] =
484 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16);
485
486 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
487 ((u16 *)buf)[1]);
488 break;
489 case SetHubFeature:
490 usbip_dbg_vhci_rh(" SetHubFeature\n");
491 retval = -EPIPE;
492 break;
493 case SetPortFeature:
494 switch (wValue) {
495 case USB_PORT_FEAT_LINK_STATE:
496 usbip_dbg_vhci_rh(
497 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n");
498 if (hcd->speed != HCD_USB3) {
499 pr_err("USB_PORT_FEAT_LINK_STATE req not "
500 "supported for USB 2.0 roothub\n");
501 goto error;
502 }
503 /*
504 * Since this is dummy we don't have an actual link so
505 * there is nothing to do for the SET_LINK_STATE cmd
506 */
507 break;
508 case USB_PORT_FEAT_U1_TIMEOUT:
509 usbip_dbg_vhci_rh(
510 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n");
511 /* Fall through */
512 case USB_PORT_FEAT_U2_TIMEOUT:
513 usbip_dbg_vhci_rh(
514 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n");
515 /* TODO: add suspend/resume support! */
516 if (hcd->speed != HCD_USB3) {
517 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not "
518 "supported for USB 2.0 roothub\n");
519 goto error;
520 }
521 break;
522 case USB_PORT_FEAT_SUSPEND:
523 usbip_dbg_vhci_rh(
524 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
525 /* Applicable only for USB2.0 hub */
526 if (hcd->speed == HCD_USB3) {
527 pr_err("USB_PORT_FEAT_SUSPEND req not "
528 "supported for USB 3.0 roothub\n");
529 goto error;
530 }
531
532 if (invalid_rhport) {
533 pr_err("invalid port number %d\n", wIndex);
534 goto error;
535 }
536
537 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND;
538 break;
539 case USB_PORT_FEAT_POWER:
540 usbip_dbg_vhci_rh(
541 " SetPortFeature: USB_PORT_FEAT_POWER\n");
542 if (invalid_rhport) {
543 pr_err("invalid port number %d\n", wIndex);
544 goto error;
545 }
546 if (hcd->speed == HCD_USB3)
547 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER;
548 else
549 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER;
550 break;
551 case USB_PORT_FEAT_BH_PORT_RESET:
552 usbip_dbg_vhci_rh(
553 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n");
554 if (invalid_rhport) {
555 pr_err("invalid port number %d\n", wIndex);
556 goto error;
557 }
558 /* Applicable only for USB3.0 hub */
559 if (hcd->speed != HCD_USB3) {
560 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not "
561 "supported for USB 2.0 roothub\n");
562 goto error;
563 }
564 /* FALLS THROUGH */
565 case USB_PORT_FEAT_RESET:
566 usbip_dbg_vhci_rh(
567 " SetPortFeature: USB_PORT_FEAT_RESET\n");
568 if (invalid_rhport) {
569 pr_err("invalid port number %d\n", wIndex);
570 goto error;
571 }
572 /* if it's already enabled, disable */
573 if (hcd->speed == HCD_USB3) {
574 vhci_hcd->port_status[rhport] = 0;
575 vhci_hcd->port_status[rhport] =
576 (USB_SS_PORT_STAT_POWER |
577 USB_PORT_STAT_CONNECTION |
578 USB_PORT_STAT_RESET);
579 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) {
580 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE
581 | USB_PORT_STAT_LOW_SPEED
582 | USB_PORT_STAT_HIGH_SPEED);
583 }
584
585 /* 50msec reset signaling */
586 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
587
588 /* FALLS THROUGH */
589 default:
590 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
591 wValue);
592 if (invalid_rhport) {
593 pr_err("invalid port number %d\n", wIndex);
594 goto error;
595 }
596 if (hcd->speed == HCD_USB3) {
597 if ((vhci_hcd->port_status[rhport] &
598 USB_SS_PORT_STAT_POWER) != 0) {
599 vhci_hcd->port_status[rhport] |= (1 << wValue);
600 }
601 } else
602 if ((vhci_hcd->port_status[rhport] &
603 USB_PORT_STAT_POWER) != 0) {
604 vhci_hcd->port_status[rhport] |= (1 << wValue);
605 }
606 }
607 break;
608 case GetPortErrorCount:
609 usbip_dbg_vhci_rh(" GetPortErrorCount\n");
610 if (hcd->speed != HCD_USB3) {
611 pr_err("GetPortErrorCount req not "
612 "supported for USB 2.0 roothub\n");
613 goto error;
614 }
615 /* We'll always return 0 since this is a dummy hub */
616 *(__le32 *) buf = cpu_to_le32(0);
617 break;
618 case SetHubDepth:
619 usbip_dbg_vhci_rh(" SetHubDepth\n");
620 if (hcd->speed != HCD_USB3) {
621 pr_err("SetHubDepth req not supported for "
622 "USB 2.0 roothub\n");
623 goto error;
624 }
625 break;
626 default:
627 pr_err("default hub control req: %04x v%04x i%04x l%d\n",
628 typeReq, wValue, wIndex, wLength);
629 error:
630 /* "protocol stall" on error */
631 retval = -EPIPE;
632 }
633
634 if (usbip_dbg_flag_vhci_rh) {
635 pr_debug("port %d\n", rhport);
636 /* Only dump valid port status */
637 if (!invalid_rhport) {
638 dump_port_status_diff(prev_port_status[rhport],
639 vhci_hcd->port_status[rhport],
640 hcd->speed == HCD_USB3);
641 }
642 }
643 usbip_dbg_vhci_rh(" bye\n");
644
645 spin_unlock_irqrestore(&vhci->lock, flags);
646
647 if (!invalid_rhport &&
648 (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) {
649 usb_hcd_poll_rh_status(hcd);
650 }
651
652 return retval;
653 }
654
655 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
656 {
657 struct vhci_priv *priv;
658 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
659 unsigned long flags;
660
661 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
662 if (!priv) {
663 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
664 return;
665 }
666
667 spin_lock_irqsave(&vdev->priv_lock, flags);
668
669 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
670 if (priv->seqnum == 0xffff)
671 dev_info(&urb->dev->dev, "seqnum max\n");
672
673 priv->vdev = vdev;
674 priv->urb = urb;
675
676 urb->hcpriv = (void *) priv;
677
678 list_add_tail(&priv->list, &vdev->priv_tx);
679
680 wake_up(&vdev->waitq_tx);
681 spin_unlock_irqrestore(&vdev->priv_lock, flags);
682 }
683
684 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
685 {
686 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
687 struct vhci *vhci = vhci_hcd->vhci;
688 struct device *dev = &urb->dev->dev;
689 u8 portnum = urb->dev->portnum;
690 int ret = 0;
691 struct vhci_device *vdev;
692 unsigned long flags;
693
694 if (portnum > VHCI_HC_PORTS) {
695 pr_err("invalid port number %d\n", portnum);
696 return -ENODEV;
697 }
698 vdev = &vhci_hcd->vdev[portnum-1];
699
700 if (!urb->transfer_buffer && !urb->num_sgs &&
701 urb->transfer_buffer_length) {
702 dev_dbg(dev, "Null URB transfer buffer\n");
703 return -EINVAL;
704 }
705
706 spin_lock_irqsave(&vhci->lock, flags);
707
708 if (urb->status != -EINPROGRESS) {
709 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
710 spin_unlock_irqrestore(&vhci->lock, flags);
711 return urb->status;
712 }
713
714 /* refuse enqueue for dead connection */
715 spin_lock(&vdev->ud.lock);
716 if (vdev->ud.status == VDEV_ST_NULL ||
717 vdev->ud.status == VDEV_ST_ERROR) {
718 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
719 spin_unlock(&vdev->ud.lock);
720 spin_unlock_irqrestore(&vhci->lock, flags);
721 return -ENODEV;
722 }
723 spin_unlock(&vdev->ud.lock);
724
725 ret = usb_hcd_link_urb_to_ep(hcd, urb);
726 if (ret)
727 goto no_need_unlink;
728
729 /*
730 * The enumeration process is as follows;
731 *
732 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
733 * to get max packet length of default pipe
734 *
735 * 2. Set_Address request to DevAddr(0) EndPoint(0)
736 *
737 */
738 if (usb_pipedevice(urb->pipe) == 0) {
739 __u8 type = usb_pipetype(urb->pipe);
740 struct usb_ctrlrequest *ctrlreq =
741 (struct usb_ctrlrequest *) urb->setup_packet;
742
743 if (type != PIPE_CONTROL || !ctrlreq) {
744 dev_err(dev, "invalid request to devnum 0\n");
745 ret = -EINVAL;
746 goto no_need_xmit;
747 }
748
749 switch (ctrlreq->bRequest) {
750 case USB_REQ_SET_ADDRESS:
751 /* set_address may come when a device is reset */
752 dev_info(dev, "SetAddress Request (%d) to port %d\n",
753 ctrlreq->wValue, vdev->rhport);
754
755 usb_put_dev(vdev->udev);
756 vdev->udev = usb_get_dev(urb->dev);
757
758 spin_lock(&vdev->ud.lock);
759 vdev->ud.status = VDEV_ST_USED;
760 spin_unlock(&vdev->ud.lock);
761
762 if (urb->status == -EINPROGRESS) {
763 /* This request is successfully completed. */
764 /* If not -EINPROGRESS, possibly unlinked. */
765 urb->status = 0;
766 }
767
768 goto no_need_xmit;
769
770 case USB_REQ_GET_DESCRIPTOR:
771 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
772 usbip_dbg_vhci_hc(
773 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
774
775 usb_put_dev(vdev->udev);
776 vdev->udev = usb_get_dev(urb->dev);
777 goto out;
778
779 default:
780 /* NOT REACHED */
781 dev_err(dev,
782 "invalid request to devnum 0 bRequest %u, wValue %u\n",
783 ctrlreq->bRequest,
784 ctrlreq->wValue);
785 ret = -EINVAL;
786 goto no_need_xmit;
787 }
788
789 }
790
791 out:
792 vhci_tx_urb(urb, vdev);
793 spin_unlock_irqrestore(&vhci->lock, flags);
794
795 return 0;
796
797 no_need_xmit:
798 usb_hcd_unlink_urb_from_ep(hcd, urb);
799 no_need_unlink:
800 spin_unlock_irqrestore(&vhci->lock, flags);
801 if (!ret)
802 usb_hcd_giveback_urb(hcd, urb, urb->status);
803 return ret;
804 }
805
806 /*
807 * vhci_rx gives back the urb after receiving the reply of the urb. If an
808 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
809 * back its urb. For the driver unlinking the urb, the content of the urb is
810 * not important, but the calling to its completion handler is important; the
811 * completion of unlinking is notified by the completion handler.
812 *
813 *
814 * CLIENT SIDE
815 *
816 * - When vhci_hcd receives RET_SUBMIT,
817 *
818 * - case 1a). the urb of the pdu is not unlinking.
819 * - normal case
820 * => just give back the urb
821 *
822 * - case 1b). the urb of the pdu is unlinking.
823 * - usbip.ko will return a reply of the unlinking request.
824 * => give back the urb now and go to case 2b).
825 *
826 * - When vhci_hcd receives RET_UNLINK,
827 *
828 * - case 2a). a submit request is still pending in vhci_hcd.
829 * - urb was really pending in usbip.ko and urb_unlink_urb() was
830 * completed there.
831 * => free a pending submit request
832 * => notify unlink completeness by giving back the urb
833 *
834 * - case 2b). a submit request is *not* pending in vhci_hcd.
835 * - urb was already given back to the core driver.
836 * => do not give back the urb
837 *
838 *
839 * SERVER SIDE
840 *
841 * - When usbip receives CMD_UNLINK,
842 *
843 * - case 3a). the urb of the unlink request is now in submission.
844 * => do usb_unlink_urb().
845 * => after the unlink is completed, send RET_UNLINK.
846 *
847 * - case 3b). the urb of the unlink request is not in submission.
848 * - may be already completed or never be received
849 * => send RET_UNLINK
850 *
851 */
852 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
853 {
854 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
855 struct vhci *vhci = vhci_hcd->vhci;
856 struct vhci_priv *priv;
857 struct vhci_device *vdev;
858 unsigned long flags;
859
860 spin_lock_irqsave(&vhci->lock, flags);
861
862 priv = urb->hcpriv;
863 if (!priv) {
864 /* URB was never linked! or will be soon given back by
865 * vhci_rx. */
866 spin_unlock_irqrestore(&vhci->lock, flags);
867 return -EIDRM;
868 }
869
870 {
871 int ret = 0;
872
873 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
874 if (ret) {
875 spin_unlock_irqrestore(&vhci->lock, flags);
876 return ret;
877 }
878 }
879
880 /* send unlink request here? */
881 vdev = priv->vdev;
882
883 if (!vdev->ud.tcp_socket) {
884 /* tcp connection is closed */
885 spin_lock(&vdev->priv_lock);
886
887 list_del(&priv->list);
888 kfree(priv);
889 urb->hcpriv = NULL;
890
891 spin_unlock(&vdev->priv_lock);
892
893 /*
894 * If tcp connection is alive, we have sent CMD_UNLINK.
895 * vhci_rx will receive RET_UNLINK and give back the URB.
896 * Otherwise, we give back it here.
897 */
898 usb_hcd_unlink_urb_from_ep(hcd, urb);
899
900 spin_unlock_irqrestore(&vhci->lock, flags);
901 usb_hcd_giveback_urb(hcd, urb, urb->status);
902 spin_lock_irqsave(&vhci->lock, flags);
903
904 } else {
905 /* tcp connection is alive */
906 struct vhci_unlink *unlink;
907
908 spin_lock(&vdev->priv_lock);
909
910 /* setup CMD_UNLINK pdu */
911 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
912 if (!unlink) {
913 spin_unlock(&vdev->priv_lock);
914 spin_unlock_irqrestore(&vhci->lock, flags);
915 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
916 return -ENOMEM;
917 }
918
919 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
920 if (unlink->seqnum == 0xffff)
921 pr_info("seqnum max\n");
922
923 unlink->unlink_seqnum = priv->seqnum;
924
925 /* send cmd_unlink and try to cancel the pending URB in the
926 * peer */
927 list_add_tail(&unlink->list, &vdev->unlink_tx);
928 wake_up(&vdev->waitq_tx);
929
930 spin_unlock(&vdev->priv_lock);
931 }
932
933 spin_unlock_irqrestore(&vhci->lock, flags);
934
935 usbip_dbg_vhci_hc("leave\n");
936 return 0;
937 }
938
939 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
940 {
941 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
942 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
943 struct vhci *vhci = vhci_hcd->vhci;
944 struct vhci_unlink *unlink, *tmp;
945 unsigned long flags;
946
947 spin_lock_irqsave(&vhci->lock, flags);
948 spin_lock(&vdev->priv_lock);
949
950 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
951 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
952 list_del(&unlink->list);
953 kfree(unlink);
954 }
955
956 while (!list_empty(&vdev->unlink_rx)) {
957 struct urb *urb;
958
959 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
960 list);
961
962 /* give back URB of unanswered unlink request */
963 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
964
965 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
966 if (!urb) {
967 pr_info("the urb (seqnum %lu) was already given back\n",
968 unlink->unlink_seqnum);
969 list_del(&unlink->list);
970 kfree(unlink);
971 continue;
972 }
973
974 urb->status = -ENODEV;
975
976 usb_hcd_unlink_urb_from_ep(hcd, urb);
977
978 list_del(&unlink->list);
979
980 spin_unlock(&vdev->priv_lock);
981 spin_unlock_irqrestore(&vhci->lock, flags);
982
983 usb_hcd_giveback_urb(hcd, urb, urb->status);
984
985 spin_lock_irqsave(&vhci->lock, flags);
986 spin_lock(&vdev->priv_lock);
987
988 kfree(unlink);
989 }
990
991 spin_unlock(&vdev->priv_lock);
992 spin_unlock_irqrestore(&vhci->lock, flags);
993 }
994
995 /*
996 * The important thing is that only one context begins cleanup.
997 * This is why error handling and cleanup become simple.
998 * We do not want to consider race condition as possible.
999 */
1000 static void vhci_shutdown_connection(struct usbip_device *ud)
1001 {
1002 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1003
1004 /* need this? see stub_dev.c */
1005 if (ud->tcp_socket) {
1006 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
1007 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
1008 }
1009
1010 /* kill threads related to this sdev */
1011 if (vdev->ud.tcp_rx) {
1012 kthread_stop_put(vdev->ud.tcp_rx);
1013 vdev->ud.tcp_rx = NULL;
1014 }
1015 if (vdev->ud.tcp_tx) {
1016 kthread_stop_put(vdev->ud.tcp_tx);
1017 vdev->ud.tcp_tx = NULL;
1018 }
1019 pr_info("stop threads\n");
1020
1021 /* active connection is closed */
1022 if (vdev->ud.tcp_socket) {
1023 sockfd_put(vdev->ud.tcp_socket);
1024 vdev->ud.tcp_socket = NULL;
1025 vdev->ud.sockfd = -1;
1026 }
1027 pr_info("release socket\n");
1028
1029 vhci_device_unlink_cleanup(vdev);
1030
1031 /*
1032 * rh_port_disconnect() is a trigger of ...
1033 * usb_disable_device():
1034 * disable all the endpoints for a USB device.
1035 * usb_disable_endpoint():
1036 * disable endpoints. pending urbs are unlinked(dequeued).
1037 *
1038 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1039 * detached device should release used urbs in a cleanup function (i.e.
1040 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1041 * pushed urbs and their private data in this function.
1042 *
1043 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1044 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1045 * gives back pushed urbs and frees their private data by request of
1046 * the cleanup function of a USB driver. When unlinking a urb with an
1047 * active connection, vhci_dequeue() does not give back the urb which
1048 * is actually given back by vhci_rx after receiving its return pdu.
1049 *
1050 */
1051 rh_port_disconnect(vdev);
1052
1053 pr_info("disconnect device\n");
1054 }
1055
1056 static void vhci_device_reset(struct usbip_device *ud)
1057 {
1058 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1059 unsigned long flags;
1060
1061 spin_lock_irqsave(&ud->lock, flags);
1062
1063 vdev->speed = 0;
1064 vdev->devid = 0;
1065
1066 usb_put_dev(vdev->udev);
1067 vdev->udev = NULL;
1068
1069 if (ud->tcp_socket) {
1070 sockfd_put(ud->tcp_socket);
1071 ud->tcp_socket = NULL;
1072 ud->sockfd = -1;
1073 }
1074 ud->status = VDEV_ST_NULL;
1075
1076 spin_unlock_irqrestore(&ud->lock, flags);
1077 }
1078
1079 static void vhci_device_unusable(struct usbip_device *ud)
1080 {
1081 unsigned long flags;
1082
1083 spin_lock_irqsave(&ud->lock, flags);
1084 ud->status = VDEV_ST_ERROR;
1085 spin_unlock_irqrestore(&ud->lock, flags);
1086 }
1087
1088 static void vhci_device_init(struct vhci_device *vdev)
1089 {
1090 memset(vdev, 0, sizeof(struct vhci_device));
1091
1092 vdev->ud.side = USBIP_VHCI;
1093 vdev->ud.status = VDEV_ST_NULL;
1094 spin_lock_init(&vdev->ud.lock);
1095
1096 INIT_LIST_HEAD(&vdev->priv_rx);
1097 INIT_LIST_HEAD(&vdev->priv_tx);
1098 INIT_LIST_HEAD(&vdev->unlink_tx);
1099 INIT_LIST_HEAD(&vdev->unlink_rx);
1100 spin_lock_init(&vdev->priv_lock);
1101
1102 init_waitqueue_head(&vdev->waitq_tx);
1103
1104 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1105 vdev->ud.eh_ops.reset = vhci_device_reset;
1106 vdev->ud.eh_ops.unusable = vhci_device_unusable;
1107
1108 usbip_start_eh(&vdev->ud);
1109 }
1110
1111 static int hcd_name_to_id(const char *name)
1112 {
1113 char *c;
1114 long val;
1115 int ret;
1116
1117 c = strchr(name, '.');
1118 if (c == NULL)
1119 return 0;
1120
1121 ret = kstrtol(c+1, 10, &val);
1122 if (ret < 0)
1123 return ret;
1124
1125 return val;
1126 }
1127
1128 static int vhci_setup(struct usb_hcd *hcd)
1129 {
1130 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1131 if (usb_hcd_is_primary_hcd(hcd)) {
1132 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1133 vhci->vhci_hcd_hs->vhci = vhci;
1134 /*
1135 * Mark the first roothub as being USB 2.0.
1136 * The USB 3.0 roothub will be registered later by
1137 * vhci_hcd_probe()
1138 */
1139 hcd->speed = HCD_USB2;
1140 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1141 } else {
1142 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1143 vhci->vhci_hcd_ss->vhci = vhci;
1144 hcd->speed = HCD_USB3;
1145 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1146 }
1147
1148 /*
1149 * Support SG.
1150 * sg_tablesize is an arbitrary value to alleviate memory pressure
1151 * on the host.
1152 */
1153 hcd->self.sg_tablesize = 32;
1154 hcd->self.no_sg_constraint = 1;
1155
1156 return 0;
1157 }
1158
1159 static int vhci_start(struct usb_hcd *hcd)
1160 {
1161 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1162 int id, rhport;
1163 int err;
1164
1165 usbip_dbg_vhci_hc("enter vhci_start\n");
1166
1167 if (usb_hcd_is_primary_hcd(hcd))
1168 spin_lock_init(&vhci_hcd->vhci->lock);
1169
1170 /* initialize private data of usb_hcd */
1171
1172 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1173 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1174
1175 vhci_device_init(vdev);
1176 vdev->rhport = rhport;
1177 }
1178
1179 atomic_set(&vhci_hcd->seqnum, 0);
1180
1181 hcd->power_budget = 0; /* no limit */
1182 hcd->uses_new_polling = 1;
1183
1184 #ifdef CONFIG_USB_OTG
1185 hcd->self.otg_port = 1;
1186 #endif
1187
1188 id = hcd_name_to_id(hcd_name(hcd));
1189 if (id < 0) {
1190 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1191 return -EINVAL;
1192 }
1193
1194 /* vhci_hcd is now ready to be controlled through sysfs */
1195 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1196 err = vhci_init_attr_group();
1197 if (err) {
1198 dev_err(hcd_dev(hcd), "init attr group failed, err = %d\n", err);
1199 return err;
1200 }
1201 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1202 if (err) {
1203 dev_err(hcd_dev(hcd), "create sysfs files failed, err = %d\n", err);
1204 vhci_finish_attr_group();
1205 return err;
1206 }
1207 pr_info("created sysfs %s\n", hcd_name(hcd));
1208 }
1209
1210 return 0;
1211 }
1212
1213 static void vhci_stop(struct usb_hcd *hcd)
1214 {
1215 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1216 int id, rhport;
1217
1218 usbip_dbg_vhci_hc("stop VHCI controller\n");
1219
1220 /* 1. remove the userland interface of vhci_hcd */
1221 id = hcd_name_to_id(hcd_name(hcd));
1222 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1223 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1224 vhci_finish_attr_group();
1225 }
1226
1227 /* 2. shutdown all the ports of vhci_hcd */
1228 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1229 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1230
1231 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1232 usbip_stop_eh(&vdev->ud);
1233 }
1234 }
1235
1236 static int vhci_get_frame_number(struct usb_hcd *hcd)
1237 {
1238 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1239 return 0;
1240 }
1241
1242 #ifdef CONFIG_PM
1243
1244 /* FIXME: suspend/resume */
1245 static int vhci_bus_suspend(struct usb_hcd *hcd)
1246 {
1247 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1248 unsigned long flags;
1249
1250 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1251
1252 spin_lock_irqsave(&vhci->lock, flags);
1253 hcd->state = HC_STATE_SUSPENDED;
1254 spin_unlock_irqrestore(&vhci->lock, flags);
1255
1256 return 0;
1257 }
1258
1259 static int vhci_bus_resume(struct usb_hcd *hcd)
1260 {
1261 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1262 int rc = 0;
1263 unsigned long flags;
1264
1265 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1266
1267 spin_lock_irqsave(&vhci->lock, flags);
1268 if (!HCD_HW_ACCESSIBLE(hcd))
1269 rc = -ESHUTDOWN;
1270 else
1271 hcd->state = HC_STATE_RUNNING;
1272 spin_unlock_irqrestore(&vhci->lock, flags);
1273
1274 return rc;
1275 }
1276
1277 #else
1278
1279 #define vhci_bus_suspend NULL
1280 #define vhci_bus_resume NULL
1281 #endif
1282
1283 /* Change a group of bulk endpoints to support multiple stream IDs */
1284 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1285 struct usb_host_endpoint **eps, unsigned int num_eps,
1286 unsigned int num_streams, gfp_t mem_flags)
1287 {
1288 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1289 return 0;
1290 }
1291
1292 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1293 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1294 struct usb_host_endpoint **eps, unsigned int num_eps,
1295 gfp_t mem_flags)
1296 {
1297 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1298 return 0;
1299 }
1300
1301 static const struct hc_driver vhci_hc_driver = {
1302 .description = driver_name,
1303 .product_desc = driver_desc,
1304 .hcd_priv_size = sizeof(struct vhci_hcd),
1305
1306 .flags = HCD_USB3 | HCD_SHARED,
1307
1308 .reset = vhci_setup,
1309 .start = vhci_start,
1310 .stop = vhci_stop,
1311
1312 .urb_enqueue = vhci_urb_enqueue,
1313 .urb_dequeue = vhci_urb_dequeue,
1314
1315 .get_frame_number = vhci_get_frame_number,
1316
1317 .hub_status_data = vhci_hub_status,
1318 .hub_control = vhci_hub_control,
1319 .bus_suspend = vhci_bus_suspend,
1320 .bus_resume = vhci_bus_resume,
1321
1322 .alloc_streams = vhci_alloc_streams,
1323 .free_streams = vhci_free_streams,
1324 };
1325
1326 static int vhci_hcd_probe(struct platform_device *pdev)
1327 {
1328 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1329 struct usb_hcd *hcd_hs;
1330 struct usb_hcd *hcd_ss;
1331 int ret;
1332
1333 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1334
1335 /*
1336 * Allocate and initialize hcd.
1337 * Our private data is also allocated automatically.
1338 */
1339 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1340 if (!hcd_hs) {
1341 pr_err("create primary hcd failed\n");
1342 return -ENOMEM;
1343 }
1344 hcd_hs->has_tt = 1;
1345
1346 /*
1347 * Finish generic HCD structure initialization and register.
1348 * Call the driver's reset() and start() routines.
1349 */
1350 ret = usb_add_hcd(hcd_hs, 0, 0);
1351 if (ret != 0) {
1352 pr_err("usb_add_hcd hs failed %d\n", ret);
1353 goto put_usb2_hcd;
1354 }
1355
1356 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1357 dev_name(&pdev->dev), hcd_hs);
1358 if (!hcd_ss) {
1359 ret = -ENOMEM;
1360 pr_err("create shared hcd failed\n");
1361 goto remove_usb2_hcd;
1362 }
1363
1364 ret = usb_add_hcd(hcd_ss, 0, 0);
1365 if (ret) {
1366 pr_err("usb_add_hcd ss failed %d\n", ret);
1367 goto put_usb3_hcd;
1368 }
1369
1370 usbip_dbg_vhci_hc("bye\n");
1371 return 0;
1372
1373 put_usb3_hcd:
1374 usb_put_hcd(hcd_ss);
1375 remove_usb2_hcd:
1376 usb_remove_hcd(hcd_hs);
1377 put_usb2_hcd:
1378 usb_put_hcd(hcd_hs);
1379 vhci->vhci_hcd_hs = NULL;
1380 vhci->vhci_hcd_ss = NULL;
1381 return ret;
1382 }
1383
1384 static int vhci_hcd_remove(struct platform_device *pdev)
1385 {
1386 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1387
1388 /*
1389 * Disconnects the root hub,
1390 * then reverses the effects of usb_add_hcd(),
1391 * invoking the HCD's stop() methods.
1392 */
1393 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1394 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1395
1396 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1397 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1398
1399 vhci->vhci_hcd_hs = NULL;
1400 vhci->vhci_hcd_ss = NULL;
1401
1402 return 0;
1403 }
1404
1405 #ifdef CONFIG_PM
1406
1407 /* what should happen for USB/IP under suspend/resume? */
1408 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1409 {
1410 struct usb_hcd *hcd;
1411 struct vhci *vhci;
1412 int rhport;
1413 int connected = 0;
1414 int ret = 0;
1415 unsigned long flags;
1416
1417 dev_dbg(&pdev->dev, "%s\n", __func__);
1418
1419 hcd = platform_get_drvdata(pdev);
1420 if (!hcd)
1421 return 0;
1422
1423 vhci = *((void **)dev_get_platdata(hcd->self.controller));
1424
1425 spin_lock_irqsave(&vhci->lock, flags);
1426
1427 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1428 if (vhci->vhci_hcd_hs->port_status[rhport] &
1429 USB_PORT_STAT_CONNECTION)
1430 connected += 1;
1431
1432 if (vhci->vhci_hcd_ss->port_status[rhport] &
1433 USB_PORT_STAT_CONNECTION)
1434 connected += 1;
1435 }
1436
1437 spin_unlock_irqrestore(&vhci->lock, flags);
1438
1439 if (connected > 0) {
1440 dev_info(&pdev->dev,
1441 "We have %d active connection%s. Do not suspend.\n",
1442 connected, (connected == 1 ? "" : "s"));
1443 ret = -EBUSY;
1444 } else {
1445 dev_info(&pdev->dev, "suspend vhci_hcd");
1446 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1447 }
1448
1449 return ret;
1450 }
1451
1452 static int vhci_hcd_resume(struct platform_device *pdev)
1453 {
1454 struct usb_hcd *hcd;
1455
1456 dev_dbg(&pdev->dev, "%s\n", __func__);
1457
1458 hcd = platform_get_drvdata(pdev);
1459 if (!hcd)
1460 return 0;
1461 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1462 usb_hcd_poll_rh_status(hcd);
1463
1464 return 0;
1465 }
1466
1467 #else
1468
1469 #define vhci_hcd_suspend NULL
1470 #define vhci_hcd_resume NULL
1471
1472 #endif
1473
1474 static struct platform_driver vhci_driver = {
1475 .probe = vhci_hcd_probe,
1476 .remove = vhci_hcd_remove,
1477 .suspend = vhci_hcd_suspend,
1478 .resume = vhci_hcd_resume,
1479 .driver = {
1480 .name = driver_name,
1481 },
1482 };
1483
1484 static void del_platform_devices(void)
1485 {
1486 struct platform_device *pdev;
1487 int i;
1488
1489 for (i = 0; i < vhci_num_controllers; i++) {
1490 pdev = vhcis[i].pdev;
1491 if (pdev != NULL)
1492 platform_device_unregister(pdev);
1493 vhcis[i].pdev = NULL;
1494 }
1495 sysfs_remove_link(&platform_bus.kobj, driver_name);
1496 }
1497
1498 static int __init vhci_hcd_init(void)
1499 {
1500 int i, ret;
1501
1502 if (usb_disabled())
1503 return -ENODEV;
1504
1505 if (vhci_num_controllers < 1)
1506 vhci_num_controllers = 1;
1507
1508 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1509 if (vhcis == NULL)
1510 return -ENOMEM;
1511
1512 for (i = 0; i < vhci_num_controllers; i++) {
1513 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1514 if (!vhcis[i].pdev) {
1515 i--;
1516 while (i >= 0)
1517 platform_device_put(vhcis[i--].pdev);
1518 ret = -ENOMEM;
1519 goto err_device_alloc;
1520 }
1521 }
1522 for (i = 0; i < vhci_num_controllers; i++) {
1523 void *vhci = &vhcis[i];
1524 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1525 if (ret)
1526 goto err_driver_register;
1527 }
1528
1529 ret = platform_driver_register(&vhci_driver);
1530 if (ret)
1531 goto err_driver_register;
1532
1533 for (i = 0; i < vhci_num_controllers; i++) {
1534 ret = platform_device_add(vhcis[i].pdev);
1535 if (ret < 0) {
1536 i--;
1537 while (i >= 0)
1538 platform_device_del(vhcis[i--].pdev);
1539 goto err_add_hcd;
1540 }
1541 }
1542
1543 return ret;
1544
1545 err_add_hcd:
1546 platform_driver_unregister(&vhci_driver);
1547 err_driver_register:
1548 for (i = 0; i < vhci_num_controllers; i++)
1549 platform_device_put(vhcis[i].pdev);
1550 err_device_alloc:
1551 kfree(vhcis);
1552 return ret;
1553 }
1554
1555 static void __exit vhci_hcd_exit(void)
1556 {
1557 del_platform_devices();
1558 platform_driver_unregister(&vhci_driver);
1559 kfree(vhcis);
1560 }
1561
1562 module_init(vhci_hcd_init);
1563 module_exit(vhci_hcd_exit);
1564
1565 MODULE_AUTHOR(DRIVER_AUTHOR);
1566 MODULE_DESCRIPTION(DRIVER_DESC);
1567 MODULE_LICENSE("GPL");
Linux with added FPC-III support