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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[deliverable/linux.git] / drivers / usb / usbip / vhci_hcd.c
1 /*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 *
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 */
19
20 #include <linux/init.h>
21 #include <linux/file.h>
22 #include <linux/kernel.h>
23 #include <linux/kthread.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/slab.h>
27
28 #include "usbip_common.h"
29 #include "vhci.h"
30
31 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
32 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
33
34 /*
35 * TODO
36 * - update root hub emulation
37 * - move the emulation code to userland ?
38 * porting to other operating systems
39 * minimize kernel code
40 * - add suspend/resume code
41 * - clean up everything
42 */
43
44 /* See usb gadget dummy hcd */
45
46 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
47 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
48 u16 wIndex, char *buff, u16 wLength);
49 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
50 gfp_t mem_flags);
51 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
52 static int vhci_start(struct usb_hcd *vhci_hcd);
53 static void vhci_stop(struct usb_hcd *hcd);
54 static int vhci_get_frame_number(struct usb_hcd *hcd);
55
56 static const char driver_name[] = "vhci_hcd";
57 static const char driver_desc[] = "USB/IP Virtual Host Controller";
58
59 struct vhci_hcd *the_controller;
60
61 static const char * const bit_desc[] = {
62 "CONNECTION", /*0*/
63 "ENABLE", /*1*/
64 "SUSPEND", /*2*/
65 "OVER_CURRENT", /*3*/
66 "RESET", /*4*/
67 "R5", /*5*/
68 "R6", /*6*/
69 "R7", /*7*/
70 "POWER", /*8*/
71 "LOWSPEED", /*9*/
72 "HIGHSPEED", /*10*/
73 "PORT_TEST", /*11*/
74 "INDICATOR", /*12*/
75 "R13", /*13*/
76 "R14", /*14*/
77 "R15", /*15*/
78 "C_CONNECTION", /*16*/
79 "C_ENABLE", /*17*/
80 "C_SUSPEND", /*18*/
81 "C_OVER_CURRENT", /*19*/
82 "C_RESET", /*20*/
83 "R21", /*21*/
84 "R22", /*22*/
85 "R23", /*23*/
86 "R24", /*24*/
87 "R25", /*25*/
88 "R26", /*26*/
89 "R27", /*27*/
90 "R28", /*28*/
91 "R29", /*29*/
92 "R30", /*30*/
93 "R31", /*31*/
94 };
95
96 static void dump_port_status_diff(u32 prev_status, u32 new_status)
97 {
98 int i = 0;
99 u32 bit = 1;
100
101 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
102 while (bit) {
103 u32 prev = prev_status & bit;
104 u32 new = new_status & bit;
105 char change;
106
107 if (!prev && new)
108 change = '+';
109 else if (prev && !new)
110 change = '-';
111 else
112 change = ' ';
113
114 if (prev || new)
115 pr_debug(" %c%s\n", change, bit_desc[i]);
116 bit <<= 1;
117 i++;
118 }
119 pr_debug("\n");
120 }
121
122 void rh_port_connect(int rhport, enum usb_device_speed speed)
123 {
124 unsigned long flags;
125
126 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
127
128 spin_lock_irqsave(&the_controller->lock, flags);
129
130 the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION
131 | (1 << USB_PORT_FEAT_C_CONNECTION);
132
133 switch (speed) {
134 case USB_SPEED_HIGH:
135 the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED;
136 break;
137 case USB_SPEED_LOW:
138 the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED;
139 break;
140 default:
141 break;
142 }
143
144 spin_unlock_irqrestore(&the_controller->lock, flags);
145
146 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
147 }
148
149 static void rh_port_disconnect(int rhport)
150 {
151 unsigned long flags;
152
153 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
154
155 spin_lock_irqsave(&the_controller->lock, flags);
156
157 the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION;
158 the_controller->port_status[rhport] |=
159 (1 << USB_PORT_FEAT_C_CONNECTION);
160
161 spin_unlock_irqrestore(&the_controller->lock, flags);
162 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
163 }
164
165 #define PORT_C_MASK \
166 ((USB_PORT_STAT_C_CONNECTION \
167 | USB_PORT_STAT_C_ENABLE \
168 | USB_PORT_STAT_C_SUSPEND \
169 | USB_PORT_STAT_C_OVERCURRENT \
170 | USB_PORT_STAT_C_RESET) << 16)
171
172 /*
173 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
174 * Ports are 0-indexed from the HCD point of view,
175 * and 1-indexed from the USB core pointer of view.
176 *
177 * @buf: a bitmap to show which port status has been changed.
178 * bit 0: reserved
179 * bit 1: the status of port 0 has been changed.
180 * bit 2: the status of port 1 has been changed.
181 * ...
182 */
183 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
184 {
185 struct vhci_hcd *vhci;
186 int retval;
187 int rhport;
188 int changed = 0;
189 unsigned long flags;
190
191 retval = DIV_ROUND_UP(VHCI_NPORTS + 1, 8);
192 memset(buf, 0, retval);
193
194 vhci = hcd_to_vhci(hcd);
195
196 spin_lock_irqsave(&vhci->lock, flags);
197 if (!HCD_HW_ACCESSIBLE(hcd)) {
198 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
199 goto done;
200 }
201
202 /* check pseudo status register for each port */
203 for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
204 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
205 /* The status of a port has been changed, */
206 usbip_dbg_vhci_rh("port %d status changed\n", rhport);
207
208 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
209 changed = 1;
210 }
211 }
212
213 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
214 usb_hcd_resume_root_hub(hcd);
215
216 done:
217 spin_unlock_irqrestore(&vhci->lock, flags);
218 return changed ? retval : 0;
219 }
220
221 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
222 {
223 memset(desc, 0, sizeof(*desc));
224 desc->bDescriptorType = USB_DT_HUB;
225 desc->bDescLength = 9;
226 desc->wHubCharacteristics = cpu_to_le16(
227 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
228 desc->bNbrPorts = VHCI_NPORTS;
229 desc->u.hs.DeviceRemovable[0] = 0xff;
230 desc->u.hs.DeviceRemovable[1] = 0xff;
231 }
232
233 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
234 u16 wIndex, char *buf, u16 wLength)
235 {
236 struct vhci_hcd *dum;
237 int retval = 0;
238 int rhport;
239 unsigned long flags;
240
241 u32 prev_port_status[VHCI_NPORTS];
242
243 if (!HCD_HW_ACCESSIBLE(hcd))
244 return -ETIMEDOUT;
245
246 /*
247 * NOTE:
248 * wIndex shows the port number and begins from 1.
249 */
250 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
251 wIndex);
252 if (wIndex > VHCI_NPORTS)
253 pr_err("invalid port number %d\n", wIndex);
254 rhport = ((__u8)(wIndex & 0x00ff)) - 1;
255
256 dum = hcd_to_vhci(hcd);
257
258 spin_lock_irqsave(&dum->lock, flags);
259
260 /* store old status and compare now and old later */
261 if (usbip_dbg_flag_vhci_rh) {
262 memcpy(prev_port_status, dum->port_status,
263 sizeof(prev_port_status));
264 }
265
266 switch (typeReq) {
267 case ClearHubFeature:
268 usbip_dbg_vhci_rh(" ClearHubFeature\n");
269 break;
270 case ClearPortFeature:
271 switch (wValue) {
272 case USB_PORT_FEAT_SUSPEND:
273 if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
274 /* 20msec signaling */
275 dum->resuming = 1;
276 dum->re_timeout =
277 jiffies + msecs_to_jiffies(20);
278 }
279 break;
280 case USB_PORT_FEAT_POWER:
281 usbip_dbg_vhci_rh(
282 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
283 dum->port_status[rhport] = 0;
284 dum->resuming = 0;
285 break;
286 case USB_PORT_FEAT_C_RESET:
287 usbip_dbg_vhci_rh(
288 " ClearPortFeature: USB_PORT_FEAT_C_RESET\n");
289 switch (dum->vdev[rhport].speed) {
290 case USB_SPEED_HIGH:
291 dum->port_status[rhport] |=
292 USB_PORT_STAT_HIGH_SPEED;
293 break;
294 case USB_SPEED_LOW:
295 dum->port_status[rhport] |=
296 USB_PORT_STAT_LOW_SPEED;
297 break;
298 default:
299 break;
300 }
301 default:
302 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
303 wValue);
304 dum->port_status[rhport] &= ~(1 << wValue);
305 break;
306 }
307 break;
308 case GetHubDescriptor:
309 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
310 hub_descriptor((struct usb_hub_descriptor *) buf);
311 break;
312 case GetHubStatus:
313 usbip_dbg_vhci_rh(" GetHubStatus\n");
314 *(__le32 *) buf = cpu_to_le32(0);
315 break;
316 case GetPortStatus:
317 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
318 if (wIndex > VHCI_NPORTS || wIndex < 1) {
319 pr_err("invalid port number %d\n", wIndex);
320 retval = -EPIPE;
321 }
322
323 /* we do not care about resume. */
324
325 /* whoever resets or resumes must GetPortStatus to
326 * complete it!!
327 */
328 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
329 dum->port_status[rhport] |=
330 (1 << USB_PORT_FEAT_C_SUSPEND);
331 dum->port_status[rhport] &=
332 ~(1 << USB_PORT_FEAT_SUSPEND);
333 dum->resuming = 0;
334 dum->re_timeout = 0;
335 }
336
337 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
338 0 && time_after(jiffies, dum->re_timeout)) {
339 dum->port_status[rhport] |=
340 (1 << USB_PORT_FEAT_C_RESET);
341 dum->port_status[rhport] &=
342 ~(1 << USB_PORT_FEAT_RESET);
343 dum->re_timeout = 0;
344
345 if (dum->vdev[rhport].ud.status ==
346 VDEV_ST_NOTASSIGNED) {
347 usbip_dbg_vhci_rh(
348 " enable rhport %d (status %u)\n",
349 rhport,
350 dum->vdev[rhport].ud.status);
351 dum->port_status[rhport] |=
352 USB_PORT_STAT_ENABLE;
353 }
354 }
355 ((__le16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
356 ((__le16 *) buf)[1] =
357 cpu_to_le16(dum->port_status[rhport] >> 16);
358
359 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
360 ((u16 *)buf)[1]);
361 break;
362 case SetHubFeature:
363 usbip_dbg_vhci_rh(" SetHubFeature\n");
364 retval = -EPIPE;
365 break;
366 case SetPortFeature:
367 switch (wValue) {
368 case USB_PORT_FEAT_SUSPEND:
369 usbip_dbg_vhci_rh(
370 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
371 break;
372 case USB_PORT_FEAT_RESET:
373 usbip_dbg_vhci_rh(
374 " SetPortFeature: USB_PORT_FEAT_RESET\n");
375 /* if it's already running, disconnect first */
376 if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
377 dum->port_status[rhport] &=
378 ~(USB_PORT_STAT_ENABLE |
379 USB_PORT_STAT_LOW_SPEED |
380 USB_PORT_STAT_HIGH_SPEED);
381 /* FIXME test that code path! */
382 }
383 /* 50msec reset signaling */
384 dum->re_timeout = jiffies + msecs_to_jiffies(50);
385
386 /* FALLTHROUGH */
387 default:
388 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
389 wValue);
390 dum->port_status[rhport] |= (1 << wValue);
391 break;
392 }
393 break;
394
395 default:
396 pr_err("default: no such request\n");
397
398 /* "protocol stall" on error */
399 retval = -EPIPE;
400 }
401
402 if (usbip_dbg_flag_vhci_rh) {
403 pr_debug("port %d\n", rhport);
404 /* Only dump valid port status */
405 if (rhport >= 0) {
406 dump_port_status_diff(prev_port_status[rhport],
407 dum->port_status[rhport]);
408 }
409 }
410 usbip_dbg_vhci_rh(" bye\n");
411
412 spin_unlock_irqrestore(&dum->lock, flags);
413
414 return retval;
415 }
416
417 static struct vhci_device *get_vdev(struct usb_device *udev)
418 {
419 int i;
420
421 if (!udev)
422 return NULL;
423
424 for (i = 0; i < VHCI_NPORTS; i++)
425 if (the_controller->vdev[i].udev == udev)
426 return port_to_vdev(i);
427
428 return NULL;
429 }
430
431 static void vhci_tx_urb(struct urb *urb)
432 {
433 struct vhci_device *vdev = get_vdev(urb->dev);
434 struct vhci_priv *priv;
435 unsigned long flags;
436
437 if (!vdev) {
438 pr_err("could not get virtual device");
439 return;
440 }
441
442 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
443 if (!priv) {
444 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
445 return;
446 }
447
448 spin_lock_irqsave(&vdev->priv_lock, flags);
449
450 priv->seqnum = atomic_inc_return(&the_controller->seqnum);
451 if (priv->seqnum == 0xffff)
452 dev_info(&urb->dev->dev, "seqnum max\n");
453
454 priv->vdev = vdev;
455 priv->urb = urb;
456
457 urb->hcpriv = (void *) priv;
458
459 list_add_tail(&priv->list, &vdev->priv_tx);
460
461 wake_up(&vdev->waitq_tx);
462 spin_unlock_irqrestore(&vdev->priv_lock, flags);
463 }
464
465 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
466 gfp_t mem_flags)
467 {
468 struct device *dev = &urb->dev->dev;
469 int ret = 0;
470 struct vhci_device *vdev;
471 unsigned long flags;
472
473 usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
474 hcd, urb, mem_flags);
475
476 /* patch to usb_sg_init() is in 2.5.60 */
477 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
478
479 spin_lock_irqsave(&the_controller->lock, flags);
480
481 if (urb->status != -EINPROGRESS) {
482 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
483 spin_unlock_irqrestore(&the_controller->lock, flags);
484 return urb->status;
485 }
486
487 vdev = port_to_vdev(urb->dev->portnum-1);
488
489 /* refuse enqueue for dead connection */
490 spin_lock(&vdev->ud.lock);
491 if (vdev->ud.status == VDEV_ST_NULL ||
492 vdev->ud.status == VDEV_ST_ERROR) {
493 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
494 spin_unlock(&vdev->ud.lock);
495 spin_unlock_irqrestore(&the_controller->lock, flags);
496 return -ENODEV;
497 }
498 spin_unlock(&vdev->ud.lock);
499
500 ret = usb_hcd_link_urb_to_ep(hcd, urb);
501 if (ret)
502 goto no_need_unlink;
503
504 /*
505 * The enumeration process is as follows;
506 *
507 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
508 * to get max packet length of default pipe
509 *
510 * 2. Set_Address request to DevAddr(0) EndPoint(0)
511 *
512 */
513 if (usb_pipedevice(urb->pipe) == 0) {
514 __u8 type = usb_pipetype(urb->pipe);
515 struct usb_ctrlrequest *ctrlreq =
516 (struct usb_ctrlrequest *) urb->setup_packet;
517
518 if (type != PIPE_CONTROL || !ctrlreq) {
519 dev_err(dev, "invalid request to devnum 0\n");
520 ret = -EINVAL;
521 goto no_need_xmit;
522 }
523
524 switch (ctrlreq->bRequest) {
525 case USB_REQ_SET_ADDRESS:
526 /* set_address may come when a device is reset */
527 dev_info(dev, "SetAddress Request (%d) to port %d\n",
528 ctrlreq->wValue, vdev->rhport);
529
530 usb_put_dev(vdev->udev);
531 vdev->udev = usb_get_dev(urb->dev);
532
533 spin_lock(&vdev->ud.lock);
534 vdev->ud.status = VDEV_ST_USED;
535 spin_unlock(&vdev->ud.lock);
536
537 if (urb->status == -EINPROGRESS) {
538 /* This request is successfully completed. */
539 /* If not -EINPROGRESS, possibly unlinked. */
540 urb->status = 0;
541 }
542
543 goto no_need_xmit;
544
545 case USB_REQ_GET_DESCRIPTOR:
546 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
547 usbip_dbg_vhci_hc(
548 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
549
550 usb_put_dev(vdev->udev);
551 vdev->udev = usb_get_dev(urb->dev);
552 goto out;
553
554 default:
555 /* NOT REACHED */
556 dev_err(dev,
557 "invalid request to devnum 0 bRequest %u, wValue %u\n",
558 ctrlreq->bRequest,
559 ctrlreq->wValue);
560 ret = -EINVAL;
561 goto no_need_xmit;
562 }
563
564 }
565
566 out:
567 vhci_tx_urb(urb);
568 spin_unlock_irqrestore(&the_controller->lock, flags);
569
570 return 0;
571
572 no_need_xmit:
573 usb_hcd_unlink_urb_from_ep(hcd, urb);
574 no_need_unlink:
575 spin_unlock_irqrestore(&the_controller->lock, flags);
576 if (!ret)
577 usb_hcd_giveback_urb(vhci_to_hcd(the_controller),
578 urb, urb->status);
579 return ret;
580 }
581
582 /*
583 * vhci_rx gives back the urb after receiving the reply of the urb. If an
584 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
585 * back its urb. For the driver unlinking the urb, the content of the urb is
586 * not important, but the calling to its completion handler is important; the
587 * completion of unlinking is notified by the completion handler.
588 *
589 *
590 * CLIENT SIDE
591 *
592 * - When vhci_hcd receives RET_SUBMIT,
593 *
594 * - case 1a). the urb of the pdu is not unlinking.
595 * - normal case
596 * => just give back the urb
597 *
598 * - case 1b). the urb of the pdu is unlinking.
599 * - usbip.ko will return a reply of the unlinking request.
600 * => give back the urb now and go to case 2b).
601 *
602 * - When vhci_hcd receives RET_UNLINK,
603 *
604 * - case 2a). a submit request is still pending in vhci_hcd.
605 * - urb was really pending in usbip.ko and urb_unlink_urb() was
606 * completed there.
607 * => free a pending submit request
608 * => notify unlink completeness by giving back the urb
609 *
610 * - case 2b). a submit request is *not* pending in vhci_hcd.
611 * - urb was already given back to the core driver.
612 * => do not give back the urb
613 *
614 *
615 * SERVER SIDE
616 *
617 * - When usbip receives CMD_UNLINK,
618 *
619 * - case 3a). the urb of the unlink request is now in submission.
620 * => do usb_unlink_urb().
621 * => after the unlink is completed, send RET_UNLINK.
622 *
623 * - case 3b). the urb of the unlink request is not in submission.
624 * - may be already completed or never be received
625 * => send RET_UNLINK
626 *
627 */
628 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
629 {
630 struct vhci_priv *priv;
631 struct vhci_device *vdev;
632 unsigned long flags;
633
634 pr_info("dequeue a urb %p\n", urb);
635
636 spin_lock_irqsave(&the_controller->lock, flags);
637
638 priv = urb->hcpriv;
639 if (!priv) {
640 /* URB was never linked! or will be soon given back by
641 * vhci_rx. */
642 spin_unlock_irqrestore(&the_controller->lock, flags);
643 return -EIDRM;
644 }
645
646 {
647 int ret = 0;
648
649 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
650 if (ret) {
651 spin_unlock_irqrestore(&the_controller->lock, flags);
652 return ret;
653 }
654 }
655
656 /* send unlink request here? */
657 vdev = priv->vdev;
658
659 if (!vdev->ud.tcp_socket) {
660 /* tcp connection is closed */
661 spin_lock(&vdev->priv_lock);
662
663 pr_info("device %p seems to be disconnected\n", vdev);
664 list_del(&priv->list);
665 kfree(priv);
666 urb->hcpriv = NULL;
667
668 spin_unlock(&vdev->priv_lock);
669
670 /*
671 * If tcp connection is alive, we have sent CMD_UNLINK.
672 * vhci_rx will receive RET_UNLINK and give back the URB.
673 * Otherwise, we give back it here.
674 */
675 pr_info("gives back urb %p\n", urb);
676
677 usb_hcd_unlink_urb_from_ep(hcd, urb);
678
679 spin_unlock_irqrestore(&the_controller->lock, flags);
680 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
681 urb->status);
682 spin_lock_irqsave(&the_controller->lock, flags);
683
684 } else {
685 /* tcp connection is alive */
686 struct vhci_unlink *unlink;
687
688 spin_lock(&vdev->priv_lock);
689
690 /* setup CMD_UNLINK pdu */
691 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
692 if (!unlink) {
693 spin_unlock(&vdev->priv_lock);
694 spin_unlock_irqrestore(&the_controller->lock, flags);
695 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
696 return -ENOMEM;
697 }
698
699 unlink->seqnum = atomic_inc_return(&the_controller->seqnum);
700 if (unlink->seqnum == 0xffff)
701 pr_info("seqnum max\n");
702
703 unlink->unlink_seqnum = priv->seqnum;
704
705 pr_info("device %p seems to be still connected\n", vdev);
706
707 /* send cmd_unlink and try to cancel the pending URB in the
708 * peer */
709 list_add_tail(&unlink->list, &vdev->unlink_tx);
710 wake_up(&vdev->waitq_tx);
711
712 spin_unlock(&vdev->priv_lock);
713 }
714
715 spin_unlock_irqrestore(&the_controller->lock, flags);
716
717 usbip_dbg_vhci_hc("leave\n");
718 return 0;
719 }
720
721 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
722 {
723 struct vhci_unlink *unlink, *tmp;
724 unsigned long flags;
725
726 spin_lock_irqsave(&the_controller->lock, flags);
727 spin_lock(&vdev->priv_lock);
728
729 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
730 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
731 list_del(&unlink->list);
732 kfree(unlink);
733 }
734
735 while (!list_empty(&vdev->unlink_rx)) {
736 struct urb *urb;
737
738 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
739 list);
740
741 /* give back URB of unanswered unlink request */
742 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
743
744 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
745 if (!urb) {
746 pr_info("the urb (seqnum %lu) was already given back\n",
747 unlink->unlink_seqnum);
748 list_del(&unlink->list);
749 kfree(unlink);
750 continue;
751 }
752
753 urb->status = -ENODEV;
754
755 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
756
757 list_del(&unlink->list);
758
759 spin_unlock(&vdev->priv_lock);
760 spin_unlock_irqrestore(&the_controller->lock, flags);
761
762 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
763 urb->status);
764
765 spin_lock_irqsave(&the_controller->lock, flags);
766 spin_lock(&vdev->priv_lock);
767
768 kfree(unlink);
769 }
770
771 spin_unlock(&vdev->priv_lock);
772 spin_unlock_irqrestore(&the_controller->lock, flags);
773 }
774
775 /*
776 * The important thing is that only one context begins cleanup.
777 * This is why error handling and cleanup become simple.
778 * We do not want to consider race condition as possible.
779 */
780 static void vhci_shutdown_connection(struct usbip_device *ud)
781 {
782 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
783
784 /* need this? see stub_dev.c */
785 if (ud->tcp_socket) {
786 pr_debug("shutdown tcp_socket %p\n", ud->tcp_socket);
787 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
788 }
789
790 /* kill threads related to this sdev */
791 if (vdev->ud.tcp_rx) {
792 kthread_stop_put(vdev->ud.tcp_rx);
793 vdev->ud.tcp_rx = NULL;
794 }
795 if (vdev->ud.tcp_tx) {
796 kthread_stop_put(vdev->ud.tcp_tx);
797 vdev->ud.tcp_tx = NULL;
798 }
799 pr_info("stop threads\n");
800
801 /* active connection is closed */
802 if (vdev->ud.tcp_socket) {
803 sockfd_put(vdev->ud.tcp_socket);
804 vdev->ud.tcp_socket = NULL;
805 }
806 pr_info("release socket\n");
807
808 vhci_device_unlink_cleanup(vdev);
809
810 /*
811 * rh_port_disconnect() is a trigger of ...
812 * usb_disable_device():
813 * disable all the endpoints for a USB device.
814 * usb_disable_endpoint():
815 * disable endpoints. pending urbs are unlinked(dequeued).
816 *
817 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
818 * detached device should release used urbs in a cleanup function (i.e.
819 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
820 * pushed urbs and their private data in this function.
821 *
822 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
823 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
824 * gives back pushed urbs and frees their private data by request of
825 * the cleanup function of a USB driver. When unlinking a urb with an
826 * active connection, vhci_dequeue() does not give back the urb which
827 * is actually given back by vhci_rx after receiving its return pdu.
828 *
829 */
830 rh_port_disconnect(vdev->rhport);
831
832 pr_info("disconnect device\n");
833 }
834
835
836 static void vhci_device_reset(struct usbip_device *ud)
837 {
838 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
839 unsigned long flags;
840
841 spin_lock_irqsave(&ud->lock, flags);
842
843 vdev->speed = 0;
844 vdev->devid = 0;
845
846 usb_put_dev(vdev->udev);
847 vdev->udev = NULL;
848
849 if (ud->tcp_socket) {
850 sockfd_put(ud->tcp_socket);
851 ud->tcp_socket = NULL;
852 }
853 ud->status = VDEV_ST_NULL;
854
855 spin_unlock_irqrestore(&ud->lock, flags);
856 }
857
858 static void vhci_device_unusable(struct usbip_device *ud)
859 {
860 unsigned long flags;
861
862 spin_lock_irqsave(&ud->lock, flags);
863 ud->status = VDEV_ST_ERROR;
864 spin_unlock_irqrestore(&ud->lock, flags);
865 }
866
867 static void vhci_device_init(struct vhci_device *vdev)
868 {
869 memset(vdev, 0, sizeof(*vdev));
870
871 vdev->ud.side = USBIP_VHCI;
872 vdev->ud.status = VDEV_ST_NULL;
873 spin_lock_init(&vdev->ud.lock);
874
875 INIT_LIST_HEAD(&vdev->priv_rx);
876 INIT_LIST_HEAD(&vdev->priv_tx);
877 INIT_LIST_HEAD(&vdev->unlink_tx);
878 INIT_LIST_HEAD(&vdev->unlink_rx);
879 spin_lock_init(&vdev->priv_lock);
880
881 init_waitqueue_head(&vdev->waitq_tx);
882
883 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
884 vdev->ud.eh_ops.reset = vhci_device_reset;
885 vdev->ud.eh_ops.unusable = vhci_device_unusable;
886
887 usbip_start_eh(&vdev->ud);
888 }
889
890 static int vhci_start(struct usb_hcd *hcd)
891 {
892 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
893 int rhport;
894 int err = 0;
895
896 usbip_dbg_vhci_hc("enter vhci_start\n");
897
898 /* initialize private data of usb_hcd */
899
900 for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
901 struct vhci_device *vdev = &vhci->vdev[rhport];
902
903 vhci_device_init(vdev);
904 vdev->rhport = rhport;
905 }
906
907 atomic_set(&vhci->seqnum, 0);
908 spin_lock_init(&vhci->lock);
909
910 hcd->power_budget = 0; /* no limit */
911 hcd->uses_new_polling = 1;
912
913 /* vhci_hcd is now ready to be controlled through sysfs */
914 err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
915 if (err) {
916 pr_err("create sysfs files\n");
917 return err;
918 }
919
920 return 0;
921 }
922
923 static void vhci_stop(struct usb_hcd *hcd)
924 {
925 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
926 int rhport = 0;
927
928 usbip_dbg_vhci_hc("stop VHCI controller\n");
929
930 /* 1. remove the userland interface of vhci_hcd */
931 sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
932
933 /* 2. shutdown all the ports of vhci_hcd */
934 for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
935 struct vhci_device *vdev = &vhci->vdev[rhport];
936
937 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
938 usbip_stop_eh(&vdev->ud);
939 }
940 }
941
942 static int vhci_get_frame_number(struct usb_hcd *hcd)
943 {
944 pr_err("Not yet implemented\n");
945 return 0;
946 }
947
948 #ifdef CONFIG_PM
949
950 /* FIXME: suspend/resume */
951 static int vhci_bus_suspend(struct usb_hcd *hcd)
952 {
953 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
954 unsigned long flags;
955
956 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
957
958 spin_lock_irqsave(&vhci->lock, flags);
959 hcd->state = HC_STATE_SUSPENDED;
960 spin_unlock_irqrestore(&vhci->lock, flags);
961
962 return 0;
963 }
964
965 static int vhci_bus_resume(struct usb_hcd *hcd)
966 {
967 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
968 int rc = 0;
969 unsigned long flags;
970
971 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
972
973 spin_lock_irqsave(&vhci->lock, flags);
974 if (!HCD_HW_ACCESSIBLE(hcd))
975 rc = -ESHUTDOWN;
976 else
977 hcd->state = HC_STATE_RUNNING;
978 spin_unlock_irqrestore(&vhci->lock, flags);
979
980 return rc;
981 }
982
983 #else
984
985 #define vhci_bus_suspend NULL
986 #define vhci_bus_resume NULL
987 #endif
988
989 static struct hc_driver vhci_hc_driver = {
990 .description = driver_name,
991 .product_desc = driver_desc,
992 .hcd_priv_size = sizeof(struct vhci_hcd),
993
994 .flags = HCD_USB2,
995
996 .start = vhci_start,
997 .stop = vhci_stop,
998
999 .urb_enqueue = vhci_urb_enqueue,
1000 .urb_dequeue = vhci_urb_dequeue,
1001
1002 .get_frame_number = vhci_get_frame_number,
1003
1004 .hub_status_data = vhci_hub_status,
1005 .hub_control = vhci_hub_control,
1006 .bus_suspend = vhci_bus_suspend,
1007 .bus_resume = vhci_bus_resume,
1008 };
1009
1010 static int vhci_hcd_probe(struct platform_device *pdev)
1011 {
1012 struct usb_hcd *hcd;
1013 int ret;
1014
1015 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1016
1017 /*
1018 * Allocate and initialize hcd.
1019 * Our private data is also allocated automatically.
1020 */
1021 hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1022 if (!hcd) {
1023 pr_err("create hcd failed\n");
1024 return -ENOMEM;
1025 }
1026 hcd->has_tt = 1;
1027
1028 /* this is private data for vhci_hcd */
1029 the_controller = hcd_to_vhci(hcd);
1030
1031 /*
1032 * Finish generic HCD structure initialization and register.
1033 * Call the driver's reset() and start() routines.
1034 */
1035 ret = usb_add_hcd(hcd, 0, 0);
1036 if (ret != 0) {
1037 pr_err("usb_add_hcd failed %d\n", ret);
1038 usb_put_hcd(hcd);
1039 the_controller = NULL;
1040 return ret;
1041 }
1042
1043 usbip_dbg_vhci_hc("bye\n");
1044 return 0;
1045 }
1046
1047 static int vhci_hcd_remove(struct platform_device *pdev)
1048 {
1049 struct usb_hcd *hcd;
1050
1051 hcd = platform_get_drvdata(pdev);
1052 if (!hcd)
1053 return 0;
1054
1055 /*
1056 * Disconnects the root hub,
1057 * then reverses the effects of usb_add_hcd(),
1058 * invoking the HCD's stop() methods.
1059 */
1060 usb_remove_hcd(hcd);
1061 usb_put_hcd(hcd);
1062 the_controller = NULL;
1063
1064 return 0;
1065 }
1066
1067 #ifdef CONFIG_PM
1068
1069 /* what should happen for USB/IP under suspend/resume? */
1070 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1071 {
1072 struct usb_hcd *hcd;
1073 int rhport = 0;
1074 int connected = 0;
1075 int ret = 0;
1076 unsigned long flags;
1077
1078 hcd = platform_get_drvdata(pdev);
1079
1080 spin_lock_irqsave(&the_controller->lock, flags);
1081
1082 for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
1083 if (the_controller->port_status[rhport] &
1084 USB_PORT_STAT_CONNECTION)
1085 connected += 1;
1086
1087 spin_unlock_irqrestore(&the_controller->lock, flags);
1088
1089 if (connected > 0) {
1090 dev_info(&pdev->dev,
1091 "We have %d active connection%s. Do not suspend.\n",
1092 connected, (connected == 1 ? "" : "s"));
1093 ret = -EBUSY;
1094 } else {
1095 dev_info(&pdev->dev, "suspend vhci_hcd");
1096 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1097 }
1098
1099 return ret;
1100 }
1101
1102 static int vhci_hcd_resume(struct platform_device *pdev)
1103 {
1104 struct usb_hcd *hcd;
1105
1106 dev_dbg(&pdev->dev, "%s\n", __func__);
1107
1108 hcd = platform_get_drvdata(pdev);
1109 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1110 usb_hcd_poll_rh_status(hcd);
1111
1112 return 0;
1113 }
1114
1115 #else
1116
1117 #define vhci_hcd_suspend NULL
1118 #define vhci_hcd_resume NULL
1119
1120 #endif
1121
1122 static struct platform_driver vhci_driver = {
1123 .probe = vhci_hcd_probe,
1124 .remove = vhci_hcd_remove,
1125 .suspend = vhci_hcd_suspend,
1126 .resume = vhci_hcd_resume,
1127 .driver = {
1128 .name = driver_name,
1129 },
1130 };
1131
1132 /*
1133 * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1134 * We need to add this virtual device as a platform device arbitrarily:
1135 * 1. platform_device_register()
1136 */
1137 static void the_pdev_release(struct device *dev)
1138 {
1139 }
1140
1141 static struct platform_device the_pdev = {
1142 /* should be the same name as driver_name */
1143 .name = driver_name,
1144 .id = -1,
1145 .dev = {
1146 .release = the_pdev_release,
1147 },
1148 };
1149
1150 static int __init vhci_hcd_init(void)
1151 {
1152 int ret;
1153
1154 if (usb_disabled())
1155 return -ENODEV;
1156
1157 ret = platform_driver_register(&vhci_driver);
1158 if (ret)
1159 goto err_driver_register;
1160
1161 ret = platform_device_register(&the_pdev);
1162 if (ret)
1163 goto err_platform_device_register;
1164
1165 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
1166 return ret;
1167
1168 err_platform_device_register:
1169 platform_driver_unregister(&vhci_driver);
1170 err_driver_register:
1171 return ret;
1172 }
1173
1174 static void __exit vhci_hcd_exit(void)
1175 {
1176 platform_device_unregister(&the_pdev);
1177 platform_driver_unregister(&vhci_driver);
1178 }
1179
1180 module_init(vhci_hcd_init);
1181 module_exit(vhci_hcd_exit);
1182
1183 MODULE_AUTHOR(DRIVER_AUTHOR);
1184 MODULE_DESCRIPTION(DRIVER_DESC);
1185 MODULE_LICENSE("GPL");
1186 MODULE_VERSION(USBIP_VERSION);
Linux kernel - Deliverables
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