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tcm_usb_gadget: Fix enabled attribute failure
[mirror_ubuntu-artful-kernel.git] / drivers / usb / gadget / legacy / tcm_usb_gadget.c
1 /* Target based USB-Gadget
2 *
3 * UAS protocol handling, target callbacks, configfs handling,
4 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
5 *
6 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
7 * License: GPLv2 as published by FSF.
8 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/configfs.h>
14 #include <linux/ctype.h>
15 #include <linux/usb/ch9.h>
16 #include <linux/usb/composite.h>
17 #include <linux/usb/gadget.h>
18 #include <linux/usb/storage.h>
19 #include <scsi/scsi_tcq.h>
20 #include <target/target_core_base.h>
21 #include <target/target_core_fabric.h>
22 #include <asm/unaligned.h>
23
24 #include "tcm_usb_gadget.h"
25
26 USB_GADGET_COMPOSITE_OPTIONS();
27
28 static inline struct f_uas *to_f_uas(struct usb_function *f)
29 {
30 return container_of(f, struct f_uas, function);
31 }
32
33 static void usbg_cmd_release(struct kref *);
34
35 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
36 {
37 kref_put(&cmd->ref, usbg_cmd_release);
38 }
39
40 /* Start bot.c code */
41
42 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
43 {
44 int ret;
45
46 if (fu->flags & USBG_BOT_CMD_PEND)
47 return 0;
48
49 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
50 if (!ret)
51 fu->flags |= USBG_BOT_CMD_PEND;
52 return ret;
53 }
54
55 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
56 {
57 struct usbg_cmd *cmd = req->context;
58 struct f_uas *fu = cmd->fu;
59
60 usbg_cleanup_cmd(cmd);
61 if (req->status < 0) {
62 pr_err("ERR %s(%d)\n", __func__, __LINE__);
63 return;
64 }
65
66 /* CSW completed, wait for next CBW */
67 bot_enqueue_cmd_cbw(fu);
68 }
69
70 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
71 {
72 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
73 int ret;
74 u8 *sense;
75 unsigned int csw_stat;
76
77 csw_stat = cmd->csw_code;
78
79 /*
80 * We can't send SENSE as a response. So we take ASC & ASCQ from our
81 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
82 * command where it learns why we failed.
83 */
84 sense = cmd->sense_iu.sense;
85
86 csw->Tag = cmd->bot_tag;
87 csw->Status = csw_stat;
88 fu->bot_status.req->context = cmd;
89 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
90 if (ret)
91 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
92 }
93
94 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
95 {
96 struct usbg_cmd *cmd = req->context;
97 struct f_uas *fu = cmd->fu;
98
99 if (req->status < 0)
100 pr_err("ERR %s(%d)\n", __func__, __LINE__);
101
102 if (cmd->data_len) {
103 if (cmd->data_len > ep->maxpacket) {
104 req->length = ep->maxpacket;
105 cmd->data_len -= ep->maxpacket;
106 } else {
107 req->length = cmd->data_len;
108 cmd->data_len = 0;
109 }
110
111 usb_ep_queue(ep, req, GFP_ATOMIC);
112 return ;
113 }
114 bot_enqueue_sense_code(fu, cmd);
115 }
116
117 static void bot_send_bad_status(struct usbg_cmd *cmd)
118 {
119 struct f_uas *fu = cmd->fu;
120 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
121 struct usb_request *req;
122 struct usb_ep *ep;
123
124 csw->Residue = cpu_to_le32(cmd->data_len);
125
126 if (cmd->data_len) {
127 if (cmd->is_read) {
128 ep = fu->ep_in;
129 req = fu->bot_req_in;
130 } else {
131 ep = fu->ep_out;
132 req = fu->bot_req_out;
133 }
134
135 if (cmd->data_len > fu->ep_in->maxpacket) {
136 req->length = ep->maxpacket;
137 cmd->data_len -= ep->maxpacket;
138 } else {
139 req->length = cmd->data_len;
140 cmd->data_len = 0;
141 }
142 req->complete = bot_err_compl;
143 req->context = cmd;
144 req->buf = fu->cmd.buf;
145 usb_ep_queue(ep, req, GFP_KERNEL);
146 } else {
147 bot_enqueue_sense_code(fu, cmd);
148 }
149 }
150
151 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
152 {
153 struct f_uas *fu = cmd->fu;
154 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
155 int ret;
156
157 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
158 if (!moved_data && cmd->data_len) {
159 /*
160 * the host wants to move data, we don't. Fill / empty
161 * the pipe and then send the csw with reside set.
162 */
163 cmd->csw_code = US_BULK_STAT_OK;
164 bot_send_bad_status(cmd);
165 return 0;
166 }
167
168 csw->Tag = cmd->bot_tag;
169 csw->Residue = cpu_to_le32(0);
170 csw->Status = US_BULK_STAT_OK;
171 fu->bot_status.req->context = cmd;
172
173 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
174 if (ret)
175 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
176 } else {
177 cmd->csw_code = US_BULK_STAT_FAIL;
178 bot_send_bad_status(cmd);
179 }
180 return 0;
181 }
182
183 /*
184 * Called after command (no data transfer) or after the write (to device)
185 * operation is completed
186 */
187 static int bot_send_status_response(struct usbg_cmd *cmd)
188 {
189 bool moved_data = false;
190
191 if (!cmd->is_read)
192 moved_data = true;
193 return bot_send_status(cmd, moved_data);
194 }
195
196 /* Read request completed, now we have to send the CSW */
197 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
198 {
199 struct usbg_cmd *cmd = req->context;
200
201 if (req->status < 0)
202 pr_err("ERR %s(%d)\n", __func__, __LINE__);
203
204 bot_send_status(cmd, true);
205 }
206
207 static int bot_send_read_response(struct usbg_cmd *cmd)
208 {
209 struct f_uas *fu = cmd->fu;
210 struct se_cmd *se_cmd = &cmd->se_cmd;
211 struct usb_gadget *gadget = fuas_to_gadget(fu);
212 int ret;
213
214 if (!cmd->data_len) {
215 cmd->csw_code = US_BULK_STAT_PHASE;
216 bot_send_bad_status(cmd);
217 return 0;
218 }
219
220 if (!gadget->sg_supported) {
221 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
222 if (!cmd->data_buf)
223 return -ENOMEM;
224
225 sg_copy_to_buffer(se_cmd->t_data_sg,
226 se_cmd->t_data_nents,
227 cmd->data_buf,
228 se_cmd->data_length);
229
230 fu->bot_req_in->buf = cmd->data_buf;
231 } else {
232 fu->bot_req_in->buf = NULL;
233 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
234 fu->bot_req_in->sg = se_cmd->t_data_sg;
235 }
236
237 fu->bot_req_in->complete = bot_read_compl;
238 fu->bot_req_in->length = se_cmd->data_length;
239 fu->bot_req_in->context = cmd;
240 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
241 if (ret)
242 pr_err("%s(%d)\n", __func__, __LINE__);
243 return 0;
244 }
245
246 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
247 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
248
249 static int bot_send_write_request(struct usbg_cmd *cmd)
250 {
251 struct f_uas *fu = cmd->fu;
252 struct se_cmd *se_cmd = &cmd->se_cmd;
253 struct usb_gadget *gadget = fuas_to_gadget(fu);
254 int ret;
255
256 init_completion(&cmd->write_complete);
257 cmd->fu = fu;
258
259 if (!cmd->data_len) {
260 cmd->csw_code = US_BULK_STAT_PHASE;
261 return -EINVAL;
262 }
263
264 if (!gadget->sg_supported) {
265 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
266 if (!cmd->data_buf)
267 return -ENOMEM;
268
269 fu->bot_req_out->buf = cmd->data_buf;
270 } else {
271 fu->bot_req_out->buf = NULL;
272 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
273 fu->bot_req_out->sg = se_cmd->t_data_sg;
274 }
275
276 fu->bot_req_out->complete = usbg_data_write_cmpl;
277 fu->bot_req_out->length = se_cmd->data_length;
278 fu->bot_req_out->context = cmd;
279
280 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
281 if (ret)
282 goto cleanup;
283 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
284 if (ret)
285 pr_err("%s(%d)\n", __func__, __LINE__);
286
287 wait_for_completion(&cmd->write_complete);
288 target_execute_cmd(se_cmd);
289 cleanup:
290 return ret;
291 }
292
293 static int bot_submit_command(struct f_uas *, void *, unsigned int);
294
295 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
296 {
297 struct f_uas *fu = req->context;
298 int ret;
299
300 fu->flags &= ~USBG_BOT_CMD_PEND;
301
302 if (req->status < 0)
303 return;
304
305 ret = bot_submit_command(fu, req->buf, req->actual);
306 if (ret)
307 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
308 }
309
310 static int bot_prepare_reqs(struct f_uas *fu)
311 {
312 int ret;
313
314 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
315 if (!fu->bot_req_in)
316 goto err;
317
318 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
319 if (!fu->bot_req_out)
320 goto err_out;
321
322 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
323 if (!fu->cmd.req)
324 goto err_cmd;
325
326 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
327 if (!fu->bot_status.req)
328 goto err_sts;
329
330 fu->bot_status.req->buf = &fu->bot_status.csw;
331 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
332 fu->bot_status.req->complete = bot_status_complete;
333 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
334
335 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
336 if (!fu->cmd.buf)
337 goto err_buf;
338
339 fu->cmd.req->complete = bot_cmd_complete;
340 fu->cmd.req->buf = fu->cmd.buf;
341 fu->cmd.req->length = fu->ep_out->maxpacket;
342 fu->cmd.req->context = fu;
343
344 ret = bot_enqueue_cmd_cbw(fu);
345 if (ret)
346 goto err_queue;
347 return 0;
348 err_queue:
349 kfree(fu->cmd.buf);
350 fu->cmd.buf = NULL;
351 err_buf:
352 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
353 err_sts:
354 usb_ep_free_request(fu->ep_out, fu->cmd.req);
355 fu->cmd.req = NULL;
356 err_cmd:
357 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
358 fu->bot_req_out = NULL;
359 err_out:
360 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
361 fu->bot_req_in = NULL;
362 err:
363 pr_err("BOT: endpoint setup failed\n");
364 return -ENOMEM;
365 }
366
367 static void bot_cleanup_old_alt(struct f_uas *fu)
368 {
369 if (!(fu->flags & USBG_ENABLED))
370 return;
371
372 usb_ep_disable(fu->ep_in);
373 usb_ep_disable(fu->ep_out);
374
375 if (!fu->bot_req_in)
376 return;
377
378 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
379 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
380 usb_ep_free_request(fu->ep_out, fu->cmd.req);
381 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
382
383 kfree(fu->cmd.buf);
384
385 fu->bot_req_in = NULL;
386 fu->bot_req_out = NULL;
387 fu->cmd.req = NULL;
388 fu->bot_status.req = NULL;
389 fu->cmd.buf = NULL;
390 }
391
392 static void bot_set_alt(struct f_uas *fu)
393 {
394 struct usb_function *f = &fu->function;
395 struct usb_gadget *gadget = f->config->cdev->gadget;
396 int ret;
397
398 fu->flags = USBG_IS_BOT;
399
400 config_ep_by_speed(gadget, f, fu->ep_in);
401 ret = usb_ep_enable(fu->ep_in);
402 if (ret)
403 goto err_b_in;
404
405 config_ep_by_speed(gadget, f, fu->ep_out);
406 ret = usb_ep_enable(fu->ep_out);
407 if (ret)
408 goto err_b_out;
409
410 ret = bot_prepare_reqs(fu);
411 if (ret)
412 goto err_wq;
413 fu->flags |= USBG_ENABLED;
414 pr_info("Using the BOT protocol\n");
415 return;
416 err_wq:
417 usb_ep_disable(fu->ep_out);
418 err_b_out:
419 usb_ep_disable(fu->ep_in);
420 err_b_in:
421 fu->flags = USBG_IS_BOT;
422 }
423
424 static int usbg_bot_setup(struct usb_function *f,
425 const struct usb_ctrlrequest *ctrl)
426 {
427 struct f_uas *fu = to_f_uas(f);
428 struct usb_composite_dev *cdev = f->config->cdev;
429 u16 w_value = le16_to_cpu(ctrl->wValue);
430 u16 w_length = le16_to_cpu(ctrl->wLength);
431 int luns;
432 u8 *ret_lun;
433
434 switch (ctrl->bRequest) {
435 case US_BULK_GET_MAX_LUN:
436 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
437 USB_RECIP_INTERFACE))
438 return -ENOTSUPP;
439
440 if (w_length < 1)
441 return -EINVAL;
442 if (w_value != 0)
443 return -EINVAL;
444 luns = atomic_read(&fu->tpg->tpg_port_count);
445 if (!luns) {
446 pr_err("No LUNs configured?\n");
447 return -EINVAL;
448 }
449 /*
450 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
451 * accessed. The upper limit is 0xf
452 */
453 luns--;
454 if (luns > 0xf) {
455 pr_info_once("Limiting the number of luns to 16\n");
456 luns = 0xf;
457 }
458 ret_lun = cdev->req->buf;
459 *ret_lun = luns;
460 cdev->req->length = 1;
461 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
462 break;
463
464 case US_BULK_RESET_REQUEST:
465 /* XXX maybe we should remove previous requests for IN + OUT */
466 bot_enqueue_cmd_cbw(fu);
467 return 0;
468 break;
469 }
470 return -ENOTSUPP;
471 }
472
473 /* Start uas.c code */
474
475 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
476 {
477 /* We have either all three allocated or none */
478 if (!stream->req_in)
479 return;
480
481 usb_ep_free_request(fu->ep_in, stream->req_in);
482 usb_ep_free_request(fu->ep_out, stream->req_out);
483 usb_ep_free_request(fu->ep_status, stream->req_status);
484
485 stream->req_in = NULL;
486 stream->req_out = NULL;
487 stream->req_status = NULL;
488 }
489
490 static void uasp_free_cmdreq(struct f_uas *fu)
491 {
492 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
493 kfree(fu->cmd.buf);
494 fu->cmd.req = NULL;
495 fu->cmd.buf = NULL;
496 }
497
498 static void uasp_cleanup_old_alt(struct f_uas *fu)
499 {
500 int i;
501
502 if (!(fu->flags & USBG_ENABLED))
503 return;
504
505 usb_ep_disable(fu->ep_in);
506 usb_ep_disable(fu->ep_out);
507 usb_ep_disable(fu->ep_status);
508 usb_ep_disable(fu->ep_cmd);
509
510 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
511 uasp_cleanup_one_stream(fu, &fu->stream[i]);
512 uasp_free_cmdreq(fu);
513 }
514
515 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
516
517 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
518 {
519 struct se_cmd *se_cmd = &cmd->se_cmd;
520 struct f_uas *fu = cmd->fu;
521 struct usb_gadget *gadget = fuas_to_gadget(fu);
522 struct uas_stream *stream = cmd->stream;
523
524 if (!gadget->sg_supported) {
525 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
526 if (!cmd->data_buf)
527 return -ENOMEM;
528
529 sg_copy_to_buffer(se_cmd->t_data_sg,
530 se_cmd->t_data_nents,
531 cmd->data_buf,
532 se_cmd->data_length);
533
534 stream->req_in->buf = cmd->data_buf;
535 } else {
536 stream->req_in->buf = NULL;
537 stream->req_in->num_sgs = se_cmd->t_data_nents;
538 stream->req_in->sg = se_cmd->t_data_sg;
539 }
540
541 stream->req_in->complete = uasp_status_data_cmpl;
542 stream->req_in->length = se_cmd->data_length;
543 stream->req_in->context = cmd;
544
545 cmd->state = UASP_SEND_STATUS;
546 return 0;
547 }
548
549 static void uasp_prepare_status(struct usbg_cmd *cmd)
550 {
551 struct se_cmd *se_cmd = &cmd->se_cmd;
552 struct sense_iu *iu = &cmd->sense_iu;
553 struct uas_stream *stream = cmd->stream;
554
555 cmd->state = UASP_QUEUE_COMMAND;
556 iu->iu_id = IU_ID_STATUS;
557 iu->tag = cpu_to_be16(cmd->tag);
558
559 /*
560 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
561 */
562 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
563 iu->status = se_cmd->scsi_status;
564 stream->req_status->context = cmd;
565 stream->req_status->length = se_cmd->scsi_sense_length + 16;
566 stream->req_status->buf = iu;
567 stream->req_status->complete = uasp_status_data_cmpl;
568 }
569
570 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
571 {
572 struct usbg_cmd *cmd = req->context;
573 struct uas_stream *stream = cmd->stream;
574 struct f_uas *fu = cmd->fu;
575 int ret;
576
577 if (req->status < 0)
578 goto cleanup;
579
580 switch (cmd->state) {
581 case UASP_SEND_DATA:
582 ret = uasp_prepare_r_request(cmd);
583 if (ret)
584 goto cleanup;
585 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
586 if (ret)
587 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
588 break;
589
590 case UASP_RECEIVE_DATA:
591 ret = usbg_prepare_w_request(cmd, stream->req_out);
592 if (ret)
593 goto cleanup;
594 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
595 if (ret)
596 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
597 break;
598
599 case UASP_SEND_STATUS:
600 uasp_prepare_status(cmd);
601 ret = usb_ep_queue(fu->ep_status, stream->req_status,
602 GFP_ATOMIC);
603 if (ret)
604 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
605 break;
606
607 case UASP_QUEUE_COMMAND:
608 usbg_cleanup_cmd(cmd);
609 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
610 break;
611
612 default:
613 BUG();
614 }
615 return;
616
617 cleanup:
618 usbg_cleanup_cmd(cmd);
619 }
620
621 static int uasp_send_status_response(struct usbg_cmd *cmd)
622 {
623 struct f_uas *fu = cmd->fu;
624 struct uas_stream *stream = cmd->stream;
625 struct sense_iu *iu = &cmd->sense_iu;
626
627 iu->tag = cpu_to_be16(cmd->tag);
628 stream->req_status->complete = uasp_status_data_cmpl;
629 stream->req_status->context = cmd;
630 cmd->fu = fu;
631 uasp_prepare_status(cmd);
632 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
633 }
634
635 static int uasp_send_read_response(struct usbg_cmd *cmd)
636 {
637 struct f_uas *fu = cmd->fu;
638 struct uas_stream *stream = cmd->stream;
639 struct sense_iu *iu = &cmd->sense_iu;
640 int ret;
641
642 cmd->fu = fu;
643
644 iu->tag = cpu_to_be16(cmd->tag);
645 if (fu->flags & USBG_USE_STREAMS) {
646
647 ret = uasp_prepare_r_request(cmd);
648 if (ret)
649 goto out;
650 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
651 if (ret) {
652 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
653 kfree(cmd->data_buf);
654 cmd->data_buf = NULL;
655 }
656
657 } else {
658
659 iu->iu_id = IU_ID_READ_READY;
660 iu->tag = cpu_to_be16(cmd->tag);
661
662 stream->req_status->complete = uasp_status_data_cmpl;
663 stream->req_status->context = cmd;
664
665 cmd->state = UASP_SEND_DATA;
666 stream->req_status->buf = iu;
667 stream->req_status->length = sizeof(struct iu);
668
669 ret = usb_ep_queue(fu->ep_status, stream->req_status,
670 GFP_ATOMIC);
671 if (ret)
672 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
673 }
674 out:
675 return ret;
676 }
677
678 static int uasp_send_write_request(struct usbg_cmd *cmd)
679 {
680 struct f_uas *fu = cmd->fu;
681 struct se_cmd *se_cmd = &cmd->se_cmd;
682 struct uas_stream *stream = cmd->stream;
683 struct sense_iu *iu = &cmd->sense_iu;
684 int ret;
685
686 init_completion(&cmd->write_complete);
687 cmd->fu = fu;
688
689 iu->tag = cpu_to_be16(cmd->tag);
690
691 if (fu->flags & USBG_USE_STREAMS) {
692
693 ret = usbg_prepare_w_request(cmd, stream->req_out);
694 if (ret)
695 goto cleanup;
696 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
697 if (ret)
698 pr_err("%s(%d)\n", __func__, __LINE__);
699
700 } else {
701
702 iu->iu_id = IU_ID_WRITE_READY;
703 iu->tag = cpu_to_be16(cmd->tag);
704
705 stream->req_status->complete = uasp_status_data_cmpl;
706 stream->req_status->context = cmd;
707
708 cmd->state = UASP_RECEIVE_DATA;
709 stream->req_status->buf = iu;
710 stream->req_status->length = sizeof(struct iu);
711
712 ret = usb_ep_queue(fu->ep_status, stream->req_status,
713 GFP_ATOMIC);
714 if (ret)
715 pr_err("%s(%d)\n", __func__, __LINE__);
716 }
717
718 wait_for_completion(&cmd->write_complete);
719 target_execute_cmd(se_cmd);
720 cleanup:
721 return ret;
722 }
723
724 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
725
726 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
727 {
728 struct f_uas *fu = req->context;
729 int ret;
730
731 if (req->status < 0)
732 return;
733
734 ret = usbg_submit_command(fu, req->buf, req->actual);
735 /*
736 * Once we tune for performance enqueue the command req here again so
737 * we can receive a second command while we processing this one. Pay
738 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
739 * don't break HS.
740 */
741 if (!ret)
742 return;
743 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
744 }
745
746 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
747 {
748 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
749 if (!stream->req_in)
750 goto out;
751
752 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
753 if (!stream->req_out)
754 goto err_out;
755
756 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
757 if (!stream->req_status)
758 goto err_sts;
759
760 return 0;
761 err_sts:
762 usb_ep_free_request(fu->ep_status, stream->req_status);
763 stream->req_status = NULL;
764 err_out:
765 usb_ep_free_request(fu->ep_out, stream->req_out);
766 stream->req_out = NULL;
767 out:
768 return -ENOMEM;
769 }
770
771 static int uasp_alloc_cmd(struct f_uas *fu)
772 {
773 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
774 if (!fu->cmd.req)
775 goto err;
776
777 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
778 if (!fu->cmd.buf)
779 goto err_buf;
780
781 fu->cmd.req->complete = uasp_cmd_complete;
782 fu->cmd.req->buf = fu->cmd.buf;
783 fu->cmd.req->length = fu->ep_cmd->maxpacket;
784 fu->cmd.req->context = fu;
785 return 0;
786
787 err_buf:
788 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
789 err:
790 return -ENOMEM;
791 }
792
793 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
794 {
795 int i;
796
797 for (i = 0; i < max_streams; i++) {
798 struct uas_stream *s = &fu->stream[i];
799
800 s->req_in->stream_id = i + 1;
801 s->req_out->stream_id = i + 1;
802 s->req_status->stream_id = i + 1;
803 }
804 }
805
806 static int uasp_prepare_reqs(struct f_uas *fu)
807 {
808 int ret;
809 int i;
810 int max_streams;
811
812 if (fu->flags & USBG_USE_STREAMS)
813 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
814 else
815 max_streams = 1;
816
817 for (i = 0; i < max_streams; i++) {
818 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
819 if (ret)
820 goto err_cleanup;
821 }
822
823 ret = uasp_alloc_cmd(fu);
824 if (ret)
825 goto err_free_stream;
826 uasp_setup_stream_res(fu, max_streams);
827
828 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
829 if (ret)
830 goto err_free_stream;
831
832 return 0;
833
834 err_free_stream:
835 uasp_free_cmdreq(fu);
836
837 err_cleanup:
838 if (i) {
839 do {
840 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
841 i--;
842 } while (i);
843 }
844 pr_err("UASP: endpoint setup failed\n");
845 return ret;
846 }
847
848 static void uasp_set_alt(struct f_uas *fu)
849 {
850 struct usb_function *f = &fu->function;
851 struct usb_gadget *gadget = f->config->cdev->gadget;
852 int ret;
853
854 fu->flags = USBG_IS_UAS;
855
856 if (gadget->speed == USB_SPEED_SUPER)
857 fu->flags |= USBG_USE_STREAMS;
858
859 config_ep_by_speed(gadget, f, fu->ep_in);
860 ret = usb_ep_enable(fu->ep_in);
861 if (ret)
862 goto err_b_in;
863
864 config_ep_by_speed(gadget, f, fu->ep_out);
865 ret = usb_ep_enable(fu->ep_out);
866 if (ret)
867 goto err_b_out;
868
869 config_ep_by_speed(gadget, f, fu->ep_cmd);
870 ret = usb_ep_enable(fu->ep_cmd);
871 if (ret)
872 goto err_cmd;
873 config_ep_by_speed(gadget, f, fu->ep_status);
874 ret = usb_ep_enable(fu->ep_status);
875 if (ret)
876 goto err_status;
877
878 ret = uasp_prepare_reqs(fu);
879 if (ret)
880 goto err_wq;
881 fu->flags |= USBG_ENABLED;
882
883 pr_info("Using the UAS protocol\n");
884 return;
885 err_wq:
886 usb_ep_disable(fu->ep_status);
887 err_status:
888 usb_ep_disable(fu->ep_cmd);
889 err_cmd:
890 usb_ep_disable(fu->ep_out);
891 err_b_out:
892 usb_ep_disable(fu->ep_in);
893 err_b_in:
894 fu->flags = 0;
895 }
896
897 static int get_cmd_dir(const unsigned char *cdb)
898 {
899 int ret;
900
901 switch (cdb[0]) {
902 case READ_6:
903 case READ_10:
904 case READ_12:
905 case READ_16:
906 case INQUIRY:
907 case MODE_SENSE:
908 case MODE_SENSE_10:
909 case SERVICE_ACTION_IN_16:
910 case MAINTENANCE_IN:
911 case PERSISTENT_RESERVE_IN:
912 case SECURITY_PROTOCOL_IN:
913 case ACCESS_CONTROL_IN:
914 case REPORT_LUNS:
915 case READ_BLOCK_LIMITS:
916 case READ_POSITION:
917 case READ_CAPACITY:
918 case READ_TOC:
919 case READ_FORMAT_CAPACITIES:
920 case REQUEST_SENSE:
921 ret = DMA_FROM_DEVICE;
922 break;
923
924 case WRITE_6:
925 case WRITE_10:
926 case WRITE_12:
927 case WRITE_16:
928 case MODE_SELECT:
929 case MODE_SELECT_10:
930 case WRITE_VERIFY:
931 case WRITE_VERIFY_12:
932 case PERSISTENT_RESERVE_OUT:
933 case MAINTENANCE_OUT:
934 case SECURITY_PROTOCOL_OUT:
935 case ACCESS_CONTROL_OUT:
936 ret = DMA_TO_DEVICE;
937 break;
938 case ALLOW_MEDIUM_REMOVAL:
939 case TEST_UNIT_READY:
940 case SYNCHRONIZE_CACHE:
941 case START_STOP:
942 case ERASE:
943 case REZERO_UNIT:
944 case SEEK_10:
945 case SPACE:
946 case VERIFY:
947 case WRITE_FILEMARKS:
948 ret = DMA_NONE;
949 break;
950 default:
951 pr_warn("target: Unknown data direction for SCSI Opcode "
952 "0x%02x\n", cdb[0]);
953 ret = -EINVAL;
954 }
955 return ret;
956 }
957
958 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
959 {
960 struct usbg_cmd *cmd = req->context;
961 struct se_cmd *se_cmd = &cmd->se_cmd;
962
963 if (req->status < 0) {
964 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
965 goto cleanup;
966 }
967
968 if (req->num_sgs == 0) {
969 sg_copy_from_buffer(se_cmd->t_data_sg,
970 se_cmd->t_data_nents,
971 cmd->data_buf,
972 se_cmd->data_length);
973 }
974
975 complete(&cmd->write_complete);
976 return;
977
978 cleanup:
979 usbg_cleanup_cmd(cmd);
980 }
981
982 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
983 {
984 struct se_cmd *se_cmd = &cmd->se_cmd;
985 struct f_uas *fu = cmd->fu;
986 struct usb_gadget *gadget = fuas_to_gadget(fu);
987
988 if (!gadget->sg_supported) {
989 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
990 if (!cmd->data_buf)
991 return -ENOMEM;
992
993 req->buf = cmd->data_buf;
994 } else {
995 req->buf = NULL;
996 req->num_sgs = se_cmd->t_data_nents;
997 req->sg = se_cmd->t_data_sg;
998 }
999
1000 req->complete = usbg_data_write_cmpl;
1001 req->length = se_cmd->data_length;
1002 req->context = cmd;
1003 return 0;
1004 }
1005
1006 static int usbg_send_status_response(struct se_cmd *se_cmd)
1007 {
1008 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1009 se_cmd);
1010 struct f_uas *fu = cmd->fu;
1011
1012 if (fu->flags & USBG_IS_BOT)
1013 return bot_send_status_response(cmd);
1014 else
1015 return uasp_send_status_response(cmd);
1016 }
1017
1018 static int usbg_send_write_request(struct se_cmd *se_cmd)
1019 {
1020 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1021 se_cmd);
1022 struct f_uas *fu = cmd->fu;
1023
1024 if (fu->flags & USBG_IS_BOT)
1025 return bot_send_write_request(cmd);
1026 else
1027 return uasp_send_write_request(cmd);
1028 }
1029
1030 static int usbg_send_read_response(struct se_cmd *se_cmd)
1031 {
1032 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1033 se_cmd);
1034 struct f_uas *fu = cmd->fu;
1035
1036 if (fu->flags & USBG_IS_BOT)
1037 return bot_send_read_response(cmd);
1038 else
1039 return uasp_send_read_response(cmd);
1040 }
1041
1042 static void usbg_cmd_work(struct work_struct *work)
1043 {
1044 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1045 struct se_cmd *se_cmd;
1046 struct tcm_usbg_nexus *tv_nexus;
1047 struct usbg_tpg *tpg;
1048 int dir;
1049
1050 se_cmd = &cmd->se_cmd;
1051 tpg = cmd->fu->tpg;
1052 tv_nexus = tpg->tpg_nexus;
1053 dir = get_cmd_dir(cmd->cmd_buf);
1054 if (dir < 0) {
1055 transport_init_se_cmd(se_cmd,
1056 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1057 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1058 cmd->prio_attr, cmd->sense_iu.sense);
1059 goto out;
1060 }
1061
1062 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1063 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1064 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1065 goto out;
1066
1067 return;
1068
1069 out:
1070 transport_send_check_condition_and_sense(se_cmd,
1071 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1072 usbg_cleanup_cmd(cmd);
1073 }
1074
1075 static int usbg_submit_command(struct f_uas *fu,
1076 void *cmdbuf, unsigned int len)
1077 {
1078 struct command_iu *cmd_iu = cmdbuf;
1079 struct usbg_cmd *cmd;
1080 struct usbg_tpg *tpg;
1081 struct se_cmd *se_cmd;
1082 struct tcm_usbg_nexus *tv_nexus;
1083 u32 cmd_len;
1084 int ret;
1085
1086 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1087 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1088 return -EINVAL;
1089 }
1090
1091 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1092 if (!cmd)
1093 return -ENOMEM;
1094
1095 cmd->fu = fu;
1096
1097 /* XXX until I figure out why I can't free in on complete */
1098 kref_init(&cmd->ref);
1099 kref_get(&cmd->ref);
1100
1101 tpg = fu->tpg;
1102 cmd_len = (cmd_iu->len & ~0x3) + 16;
1103 if (cmd_len > USBG_MAX_CMD)
1104 goto err;
1105
1106 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1107
1108 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1109 cmd->se_cmd.tag = cmd->tag;
1110 if (fu->flags & USBG_USE_STREAMS) {
1111 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1112 goto err;
1113 if (!cmd->tag)
1114 cmd->stream = &fu->stream[0];
1115 else
1116 cmd->stream = &fu->stream[cmd->tag - 1];
1117 } else {
1118 cmd->stream = &fu->stream[0];
1119 }
1120
1121 tv_nexus = tpg->tpg_nexus;
1122 if (!tv_nexus) {
1123 pr_err("Missing nexus, ignoring command\n");
1124 goto err;
1125 }
1126
1127 switch (cmd_iu->prio_attr & 0x7) {
1128 case UAS_HEAD_TAG:
1129 cmd->prio_attr = TCM_HEAD_TAG;
1130 break;
1131 case UAS_ORDERED_TAG:
1132 cmd->prio_attr = TCM_ORDERED_TAG;
1133 break;
1134 case UAS_ACA:
1135 cmd->prio_attr = TCM_ACA_TAG;
1136 break;
1137 default:
1138 pr_debug_once("Unsupported prio_attr: %02x.\n",
1139 cmd_iu->prio_attr);
1140 case UAS_SIMPLE_TAG:
1141 cmd->prio_attr = TCM_SIMPLE_TAG;
1142 break;
1143 }
1144
1145 se_cmd = &cmd->se_cmd;
1146 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1147
1148 INIT_WORK(&cmd->work, usbg_cmd_work);
1149 ret = queue_work(tpg->workqueue, &cmd->work);
1150 if (ret < 0)
1151 goto err;
1152
1153 return 0;
1154 err:
1155 kfree(cmd);
1156 return -EINVAL;
1157 }
1158
1159 static void bot_cmd_work(struct work_struct *work)
1160 {
1161 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1162 struct se_cmd *se_cmd;
1163 struct tcm_usbg_nexus *tv_nexus;
1164 struct usbg_tpg *tpg;
1165 int dir;
1166
1167 se_cmd = &cmd->se_cmd;
1168 tpg = cmd->fu->tpg;
1169 tv_nexus = tpg->tpg_nexus;
1170 dir = get_cmd_dir(cmd->cmd_buf);
1171 if (dir < 0) {
1172 transport_init_se_cmd(se_cmd,
1173 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1174 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1175 cmd->prio_attr, cmd->sense_iu.sense);
1176 goto out;
1177 }
1178
1179 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1180 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1181 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1182 goto out;
1183
1184 return;
1185
1186 out:
1187 transport_send_check_condition_and_sense(se_cmd,
1188 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1189 usbg_cleanup_cmd(cmd);
1190 }
1191
1192 static int bot_submit_command(struct f_uas *fu,
1193 void *cmdbuf, unsigned int len)
1194 {
1195 struct bulk_cb_wrap *cbw = cmdbuf;
1196 struct usbg_cmd *cmd;
1197 struct usbg_tpg *tpg;
1198 struct se_cmd *se_cmd;
1199 struct tcm_usbg_nexus *tv_nexus;
1200 u32 cmd_len;
1201 int ret;
1202
1203 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1204 pr_err("Wrong signature on CBW\n");
1205 return -EINVAL;
1206 }
1207 if (len != 31) {
1208 pr_err("Wrong length for CBW\n");
1209 return -EINVAL;
1210 }
1211
1212 cmd_len = cbw->Length;
1213 if (cmd_len < 1 || cmd_len > 16)
1214 return -EINVAL;
1215
1216 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1217 if (!cmd)
1218 return -ENOMEM;
1219
1220 cmd->fu = fu;
1221
1222 /* XXX until I figure out why I can't free in on complete */
1223 kref_init(&cmd->ref);
1224 kref_get(&cmd->ref);
1225
1226 tpg = fu->tpg;
1227
1228 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1229
1230 cmd->bot_tag = cbw->Tag;
1231
1232 tv_nexus = tpg->tpg_nexus;
1233 if (!tv_nexus) {
1234 pr_err("Missing nexus, ignoring command\n");
1235 goto err;
1236 }
1237
1238 cmd->prio_attr = TCM_SIMPLE_TAG;
1239 se_cmd = &cmd->se_cmd;
1240 cmd->unpacked_lun = cbw->Lun;
1241 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1242 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1243 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1244
1245 INIT_WORK(&cmd->work, bot_cmd_work);
1246 ret = queue_work(tpg->workqueue, &cmd->work);
1247 if (ret < 0)
1248 goto err;
1249
1250 return 0;
1251 err:
1252 kfree(cmd);
1253 return -EINVAL;
1254 }
1255
1256 /* Start fabric.c code */
1257
1258 static int usbg_check_true(struct se_portal_group *se_tpg)
1259 {
1260 return 1;
1261 }
1262
1263 static int usbg_check_false(struct se_portal_group *se_tpg)
1264 {
1265 return 0;
1266 }
1267
1268 static char *usbg_get_fabric_name(void)
1269 {
1270 return "usb_gadget";
1271 }
1272
1273 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1274 {
1275 struct usbg_tpg *tpg = container_of(se_tpg,
1276 struct usbg_tpg, se_tpg);
1277 struct usbg_tport *tport = tpg->tport;
1278
1279 return &tport->tport_name[0];
1280 }
1281
1282 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1283 {
1284 struct usbg_tpg *tpg = container_of(se_tpg,
1285 struct usbg_tpg, se_tpg);
1286 return tpg->tport_tpgt;
1287 }
1288
1289 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1290 {
1291 return 1;
1292 }
1293
1294 static void usbg_cmd_release(struct kref *ref)
1295 {
1296 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1297 ref);
1298
1299 transport_generic_free_cmd(&cmd->se_cmd, 0);
1300 }
1301
1302 static void usbg_release_cmd(struct se_cmd *se_cmd)
1303 {
1304 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1305 se_cmd);
1306 kfree(cmd->data_buf);
1307 kfree(cmd);
1308 return;
1309 }
1310
1311 static int usbg_shutdown_session(struct se_session *se_sess)
1312 {
1313 return 0;
1314 }
1315
1316 static void usbg_close_session(struct se_session *se_sess)
1317 {
1318 return;
1319 }
1320
1321 static u32 usbg_sess_get_index(struct se_session *se_sess)
1322 {
1323 return 0;
1324 }
1325
1326 /*
1327 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1328 */
1329 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1330 {
1331 return 0;
1332 }
1333
1334 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1335 {
1336 return;
1337 }
1338
1339 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1340 {
1341 return 0;
1342 }
1343
1344 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1345 {
1346 }
1347
1348 static void usbg_aborted_task(struct se_cmd *se_cmd)
1349 {
1350 return;
1351 }
1352
1353 static const char *usbg_check_wwn(const char *name)
1354 {
1355 const char *n;
1356 unsigned int len;
1357
1358 n = strstr(name, "naa.");
1359 if (!n)
1360 return NULL;
1361 n += 4;
1362 len = strlen(n);
1363 if (len == 0 || len > USBG_NAMELEN - 1)
1364 return NULL;
1365 return n;
1366 }
1367
1368 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1369 {
1370 if (!usbg_check_wwn(name))
1371 return -EINVAL;
1372 return 0;
1373 }
1374
1375 struct usbg_tpg *the_only_tpg_I_currently_have;
1376
1377 static struct se_portal_group *usbg_make_tpg(
1378 struct se_wwn *wwn,
1379 struct config_group *group,
1380 const char *name)
1381 {
1382 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1383 tport_wwn);
1384 struct usbg_tpg *tpg;
1385 unsigned long tpgt;
1386 int ret;
1387
1388 if (strstr(name, "tpgt_") != name)
1389 return ERR_PTR(-EINVAL);
1390 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1391 return ERR_PTR(-EINVAL);
1392 if (the_only_tpg_I_currently_have) {
1393 pr_err("Until the gadget framework can't handle multiple\n");
1394 pr_err("gadgets, you can't do this here.\n");
1395 return ERR_PTR(-EBUSY);
1396 }
1397
1398 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1399 if (!tpg)
1400 return ERR_PTR(-ENOMEM);
1401 mutex_init(&tpg->tpg_mutex);
1402 atomic_set(&tpg->tpg_port_count, 0);
1403 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1404 if (!tpg->workqueue) {
1405 kfree(tpg);
1406 return NULL;
1407 }
1408
1409 tpg->tport = tport;
1410 tpg->tport_tpgt = tpgt;
1411
1412 /*
1413 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1414 * pretend to be SAS..
1415 */
1416 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1417 if (ret < 0) {
1418 destroy_workqueue(tpg->workqueue);
1419 kfree(tpg);
1420 return NULL;
1421 }
1422 the_only_tpg_I_currently_have = tpg;
1423 return &tpg->se_tpg;
1424 }
1425
1426 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1427
1428 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1429 {
1430 struct usbg_tpg *tpg = container_of(se_tpg,
1431 struct usbg_tpg, se_tpg);
1432
1433 tcm_usbg_drop_nexus(tpg);
1434 core_tpg_deregister(se_tpg);
1435 destroy_workqueue(tpg->workqueue);
1436 kfree(tpg);
1437 the_only_tpg_I_currently_have = NULL;
1438 }
1439
1440 static struct se_wwn *usbg_make_tport(
1441 struct target_fabric_configfs *tf,
1442 struct config_group *group,
1443 const char *name)
1444 {
1445 struct usbg_tport *tport;
1446 const char *wnn_name;
1447 u64 wwpn = 0;
1448
1449 wnn_name = usbg_check_wwn(name);
1450 if (!wnn_name)
1451 return ERR_PTR(-EINVAL);
1452
1453 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1454 if (!(tport))
1455 return ERR_PTR(-ENOMEM);
1456 tport->tport_wwpn = wwpn;
1457 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1458 return &tport->tport_wwn;
1459 }
1460
1461 static void usbg_drop_tport(struct se_wwn *wwn)
1462 {
1463 struct usbg_tport *tport = container_of(wwn,
1464 struct usbg_tport, tport_wwn);
1465 kfree(tport);
1466 }
1467
1468 /*
1469 * If somebody feels like dropping the version property, go ahead.
1470 */
1471 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1472 {
1473 return sprintf(page, "usb-gadget fabric module\n");
1474 }
1475
1476 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1477
1478 static struct configfs_attribute *usbg_wwn_attrs[] = {
1479 &usbg_wwn_attr_version,
1480 NULL,
1481 };
1482
1483 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1484 {
1485 struct se_portal_group *se_tpg = to_tpg(item);
1486 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1487
1488 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1489 }
1490
1491 static int usbg_attach(struct usbg_tpg *);
1492 static void usbg_detach(struct usbg_tpg *);
1493
1494 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1495 const char *page, size_t count)
1496 {
1497 struct se_portal_group *se_tpg = to_tpg(item);
1498 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1499 unsigned long op;
1500 ssize_t ret;
1501
1502 ret = kstrtoul(page, 0, &op);
1503 if (ret < 0)
1504 return -EINVAL;
1505 if (op > 1)
1506 return -EINVAL;
1507
1508 if (op && tpg->gadget_connect) {
1509 ret = -EINVAL;
1510 goto out;
1511 }
1512 if (!op && !tpg->gadget_connect) {
1513 ret = -EINVAL;
1514 goto out;
1515 }
1516
1517 if (op) {
1518 ret = usbg_attach(tpg);
1519 if (ret)
1520 goto out;
1521 } else {
1522 usbg_detach(tpg);
1523 }
1524 tpg->gadget_connect = op;
1525
1526 return count;
1527 out:
1528 return ret;
1529 }
1530
1531 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1532 {
1533 struct se_portal_group *se_tpg = to_tpg(item);
1534 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1535 struct tcm_usbg_nexus *tv_nexus;
1536 ssize_t ret;
1537
1538 mutex_lock(&tpg->tpg_mutex);
1539 tv_nexus = tpg->tpg_nexus;
1540 if (!tv_nexus) {
1541 ret = -ENODEV;
1542 goto out;
1543 }
1544 ret = snprintf(page, PAGE_SIZE, "%s\n",
1545 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1546 out:
1547 mutex_unlock(&tpg->tpg_mutex);
1548 return ret;
1549 }
1550
1551 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1552 {
1553 struct se_portal_group *se_tpg;
1554 struct tcm_usbg_nexus *tv_nexus;
1555 int ret;
1556
1557 mutex_lock(&tpg->tpg_mutex);
1558 if (tpg->tpg_nexus) {
1559 ret = -EEXIST;
1560 pr_debug("tpg->tpg_nexus already exists\n");
1561 goto err_unlock;
1562 }
1563 se_tpg = &tpg->se_tpg;
1564
1565 ret = -ENOMEM;
1566 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1567 if (!tv_nexus)
1568 goto err_unlock;
1569 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1570 if (IS_ERR(tv_nexus->tvn_se_sess))
1571 goto err_free;
1572
1573 /*
1574 * Since we are running in 'demo mode' this call with generate a
1575 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1576 * the SCSI Initiator port name of the passed configfs group 'name'.
1577 */
1578 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1579 se_tpg, name);
1580 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1581 pr_debug("core_tpg_check_initiator_node_acl() failed"
1582 " for %s\n", name);
1583 goto err_session;
1584 }
1585 /*
1586 * Now register the TCM vHost virtual I_T Nexus as active.
1587 */
1588 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1589 tv_nexus->tvn_se_sess, tv_nexus);
1590 tpg->tpg_nexus = tv_nexus;
1591 mutex_unlock(&tpg->tpg_mutex);
1592 return 0;
1593
1594 err_session:
1595 transport_free_session(tv_nexus->tvn_se_sess);
1596 err_free:
1597 kfree(tv_nexus);
1598 err_unlock:
1599 mutex_unlock(&tpg->tpg_mutex);
1600 return ret;
1601 }
1602
1603 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1604 {
1605 struct se_session *se_sess;
1606 struct tcm_usbg_nexus *tv_nexus;
1607 int ret = -ENODEV;
1608
1609 mutex_lock(&tpg->tpg_mutex);
1610 tv_nexus = tpg->tpg_nexus;
1611 if (!tv_nexus)
1612 goto out;
1613
1614 se_sess = tv_nexus->tvn_se_sess;
1615 if (!se_sess)
1616 goto out;
1617
1618 if (atomic_read(&tpg->tpg_port_count)) {
1619 ret = -EPERM;
1620 pr_err("Unable to remove Host I_T Nexus with"
1621 " active TPG port count: %d\n",
1622 atomic_read(&tpg->tpg_port_count));
1623 goto out;
1624 }
1625
1626 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1627 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1628 /*
1629 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1630 */
1631 transport_deregister_session(tv_nexus->tvn_se_sess);
1632 tpg->tpg_nexus = NULL;
1633
1634 kfree(tv_nexus);
1635 ret = 0;
1636 out:
1637 mutex_unlock(&tpg->tpg_mutex);
1638 return ret;
1639 }
1640
1641 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1642 const char *page, size_t count)
1643 {
1644 struct se_portal_group *se_tpg = to_tpg(item);
1645 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1646 unsigned char i_port[USBG_NAMELEN], *ptr;
1647 int ret;
1648
1649 if (!strncmp(page, "NULL", 4)) {
1650 ret = tcm_usbg_drop_nexus(tpg);
1651 return (!ret) ? count : ret;
1652 }
1653 if (strlen(page) >= USBG_NAMELEN) {
1654 pr_err("Emulated NAA Sas Address: %s, exceeds"
1655 " max: %d\n", page, USBG_NAMELEN);
1656 return -EINVAL;
1657 }
1658 snprintf(i_port, USBG_NAMELEN, "%s", page);
1659
1660 ptr = strstr(i_port, "naa.");
1661 if (!ptr) {
1662 pr_err("Missing 'naa.' prefix\n");
1663 return -EINVAL;
1664 }
1665
1666 if (i_port[strlen(i_port) - 1] == '\n')
1667 i_port[strlen(i_port) - 1] = '\0';
1668
1669 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1670 if (ret < 0)
1671 return ret;
1672 return count;
1673 }
1674
1675 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1676 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1677
1678 static struct configfs_attribute *usbg_base_attrs[] = {
1679 &tcm_usbg_tpg_attr_enable,
1680 &tcm_usbg_tpg_attr_nexus,
1681 NULL,
1682 };
1683
1684 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1685 {
1686 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1687
1688 atomic_inc(&tpg->tpg_port_count);
1689 smp_mb__after_atomic();
1690 return 0;
1691 }
1692
1693 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1694 struct se_lun *se_lun)
1695 {
1696 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1697
1698 atomic_dec(&tpg->tpg_port_count);
1699 smp_mb__after_atomic();
1700 }
1701
1702 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1703 {
1704 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1705 se_cmd);
1706
1707 kref_put(&cmd->ref, usbg_cmd_release);
1708 return 1;
1709 }
1710
1711 static const struct target_core_fabric_ops usbg_ops = {
1712 .module = THIS_MODULE,
1713 .name = "usb_gadget",
1714 .get_fabric_name = usbg_get_fabric_name,
1715 .tpg_get_wwn = usbg_get_fabric_wwn,
1716 .tpg_get_tag = usbg_get_tag,
1717 .tpg_check_demo_mode = usbg_check_true,
1718 .tpg_check_demo_mode_cache = usbg_check_false,
1719 .tpg_check_demo_mode_write_protect = usbg_check_false,
1720 .tpg_check_prod_mode_write_protect = usbg_check_false,
1721 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1722 .release_cmd = usbg_release_cmd,
1723 .shutdown_session = usbg_shutdown_session,
1724 .close_session = usbg_close_session,
1725 .sess_get_index = usbg_sess_get_index,
1726 .sess_get_initiator_sid = NULL,
1727 .write_pending = usbg_send_write_request,
1728 .write_pending_status = usbg_write_pending_status,
1729 .set_default_node_attributes = usbg_set_default_node_attrs,
1730 .get_cmd_state = usbg_get_cmd_state,
1731 .queue_data_in = usbg_send_read_response,
1732 .queue_status = usbg_send_status_response,
1733 .queue_tm_rsp = usbg_queue_tm_rsp,
1734 .aborted_task = usbg_aborted_task,
1735 .check_stop_free = usbg_check_stop_free,
1736
1737 .fabric_make_wwn = usbg_make_tport,
1738 .fabric_drop_wwn = usbg_drop_tport,
1739 .fabric_make_tpg = usbg_make_tpg,
1740 .fabric_drop_tpg = usbg_drop_tpg,
1741 .fabric_post_link = usbg_port_link,
1742 .fabric_pre_unlink = usbg_port_unlink,
1743 .fabric_init_nodeacl = usbg_init_nodeacl,
1744
1745 .tfc_wwn_attrs = usbg_wwn_attrs,
1746 .tfc_tpg_base_attrs = usbg_base_attrs,
1747 };
1748
1749 /* Start gadget.c code */
1750
1751 static struct usb_interface_descriptor bot_intf_desc = {
1752 .bLength = sizeof(bot_intf_desc),
1753 .bDescriptorType = USB_DT_INTERFACE,
1754 .bNumEndpoints = 2,
1755 .bAlternateSetting = USB_G_ALT_INT_BBB,
1756 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1757 .bInterfaceSubClass = USB_SC_SCSI,
1758 .bInterfaceProtocol = USB_PR_BULK,
1759 };
1760
1761 static struct usb_interface_descriptor uasp_intf_desc = {
1762 .bLength = sizeof(uasp_intf_desc),
1763 .bDescriptorType = USB_DT_INTERFACE,
1764 .bNumEndpoints = 4,
1765 .bAlternateSetting = USB_G_ALT_INT_UAS,
1766 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1767 .bInterfaceSubClass = USB_SC_SCSI,
1768 .bInterfaceProtocol = USB_PR_UAS,
1769 };
1770
1771 static struct usb_endpoint_descriptor uasp_bi_desc = {
1772 .bLength = USB_DT_ENDPOINT_SIZE,
1773 .bDescriptorType = USB_DT_ENDPOINT,
1774 .bEndpointAddress = USB_DIR_IN,
1775 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1776 .wMaxPacketSize = cpu_to_le16(512),
1777 };
1778
1779 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1780 .bLength = USB_DT_ENDPOINT_SIZE,
1781 .bDescriptorType = USB_DT_ENDPOINT,
1782 .bEndpointAddress = USB_DIR_IN,
1783 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1784 };
1785
1786 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1787 .bLength = sizeof(uasp_bi_pipe_desc),
1788 .bDescriptorType = USB_DT_PIPE_USAGE,
1789 .bPipeID = DATA_IN_PIPE_ID,
1790 };
1791
1792 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1793 .bLength = USB_DT_ENDPOINT_SIZE,
1794 .bDescriptorType = USB_DT_ENDPOINT,
1795 .bEndpointAddress = USB_DIR_IN,
1796 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1797 .wMaxPacketSize = cpu_to_le16(1024),
1798 };
1799
1800 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1801 .bLength = sizeof(uasp_bi_ep_comp_desc),
1802 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1803 .bMaxBurst = 0,
1804 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1805 .wBytesPerInterval = 0,
1806 };
1807
1808 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1809 .bLength = sizeof(bot_bi_ep_comp_desc),
1810 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1811 .bMaxBurst = 0,
1812 };
1813
1814 static struct usb_endpoint_descriptor uasp_bo_desc = {
1815 .bLength = USB_DT_ENDPOINT_SIZE,
1816 .bDescriptorType = USB_DT_ENDPOINT,
1817 .bEndpointAddress = USB_DIR_OUT,
1818 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1819 .wMaxPacketSize = cpu_to_le16(512),
1820 };
1821
1822 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1823 .bLength = USB_DT_ENDPOINT_SIZE,
1824 .bDescriptorType = USB_DT_ENDPOINT,
1825 .bEndpointAddress = USB_DIR_OUT,
1826 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1827 };
1828
1829 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1830 .bLength = sizeof(uasp_bo_pipe_desc),
1831 .bDescriptorType = USB_DT_PIPE_USAGE,
1832 .bPipeID = DATA_OUT_PIPE_ID,
1833 };
1834
1835 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1836 .bLength = USB_DT_ENDPOINT_SIZE,
1837 .bDescriptorType = USB_DT_ENDPOINT,
1838 .bEndpointAddress = USB_DIR_OUT,
1839 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1840 .wMaxPacketSize = cpu_to_le16(0x400),
1841 };
1842
1843 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1844 .bLength = sizeof(uasp_bo_ep_comp_desc),
1845 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1846 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1847 };
1848
1849 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1850 .bLength = sizeof(bot_bo_ep_comp_desc),
1851 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1852 };
1853
1854 static struct usb_endpoint_descriptor uasp_status_desc = {
1855 .bLength = USB_DT_ENDPOINT_SIZE,
1856 .bDescriptorType = USB_DT_ENDPOINT,
1857 .bEndpointAddress = USB_DIR_IN,
1858 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1859 .wMaxPacketSize = cpu_to_le16(512),
1860 };
1861
1862 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1863 .bLength = USB_DT_ENDPOINT_SIZE,
1864 .bDescriptorType = USB_DT_ENDPOINT,
1865 .bEndpointAddress = USB_DIR_IN,
1866 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1867 };
1868
1869 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1870 .bLength = sizeof(uasp_status_pipe_desc),
1871 .bDescriptorType = USB_DT_PIPE_USAGE,
1872 .bPipeID = STATUS_PIPE_ID,
1873 };
1874
1875 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1876 .bLength = USB_DT_ENDPOINT_SIZE,
1877 .bDescriptorType = USB_DT_ENDPOINT,
1878 .bEndpointAddress = USB_DIR_IN,
1879 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1880 .wMaxPacketSize = cpu_to_le16(1024),
1881 };
1882
1883 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1884 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1885 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1886 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1887 };
1888
1889 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1890 .bLength = USB_DT_ENDPOINT_SIZE,
1891 .bDescriptorType = USB_DT_ENDPOINT,
1892 .bEndpointAddress = USB_DIR_OUT,
1893 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1894 .wMaxPacketSize = cpu_to_le16(512),
1895 };
1896
1897 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1898 .bLength = USB_DT_ENDPOINT_SIZE,
1899 .bDescriptorType = USB_DT_ENDPOINT,
1900 .bEndpointAddress = USB_DIR_OUT,
1901 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1902 };
1903
1904 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1905 .bLength = sizeof(uasp_cmd_pipe_desc),
1906 .bDescriptorType = USB_DT_PIPE_USAGE,
1907 .bPipeID = CMD_PIPE_ID,
1908 };
1909
1910 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1911 .bLength = USB_DT_ENDPOINT_SIZE,
1912 .bDescriptorType = USB_DT_ENDPOINT,
1913 .bEndpointAddress = USB_DIR_OUT,
1914 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1915 .wMaxPacketSize = cpu_to_le16(1024),
1916 };
1917
1918 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1919 .bLength = sizeof(uasp_cmd_comp_desc),
1920 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1921 };
1922
1923 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1924 (struct usb_descriptor_header *) &bot_intf_desc,
1925 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1926 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1927
1928 (struct usb_descriptor_header *) &uasp_intf_desc,
1929 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1930 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1931 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1932 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1933 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1934 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1935 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1936 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1937 NULL,
1938 };
1939
1940 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1941 (struct usb_descriptor_header *) &bot_intf_desc,
1942 (struct usb_descriptor_header *) &uasp_bi_desc,
1943 (struct usb_descriptor_header *) &uasp_bo_desc,
1944
1945 (struct usb_descriptor_header *) &uasp_intf_desc,
1946 (struct usb_descriptor_header *) &uasp_bi_desc,
1947 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1948 (struct usb_descriptor_header *) &uasp_bo_desc,
1949 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1950 (struct usb_descriptor_header *) &uasp_status_desc,
1951 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1952 (struct usb_descriptor_header *) &uasp_cmd_desc,
1953 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1954 NULL,
1955 };
1956
1957 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1958 (struct usb_descriptor_header *) &bot_intf_desc,
1959 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1960 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1961 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1962 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1963
1964 (struct usb_descriptor_header *) &uasp_intf_desc,
1965 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1966 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1967 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1968 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1969 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1970 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1971 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1972 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1973 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1974 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1975 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1976 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1977 NULL,
1978 };
1979
1980 #define UAS_VENDOR_ID 0x0525 /* NetChip */
1981 #define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
1982
1983 static struct usb_device_descriptor usbg_device_desc = {
1984 .bLength = sizeof(usbg_device_desc),
1985 .bDescriptorType = USB_DT_DEVICE,
1986 .bcdUSB = cpu_to_le16(0x0200),
1987 .bDeviceClass = USB_CLASS_PER_INTERFACE,
1988 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
1989 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
1990 .bNumConfigurations = 1,
1991 };
1992
1993 static struct usb_string usbg_us_strings[] = {
1994 [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
1995 [USB_GADGET_PRODUCT_IDX].s = "Target Product",
1996 [USB_GADGET_SERIAL_IDX].s = "000000000001",
1997 [USB_G_STR_CONFIG].s = "default config",
1998 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1999 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
2000 { },
2001 };
2002
2003 static struct usb_gadget_strings usbg_stringtab = {
2004 .language = 0x0409,
2005 .strings = usbg_us_strings,
2006 };
2007
2008 static struct usb_gadget_strings *usbg_strings[] = {
2009 &usbg_stringtab,
2010 NULL,
2011 };
2012
2013 static int guas_unbind(struct usb_composite_dev *cdev)
2014 {
2015 return 0;
2016 }
2017
2018 static struct usb_configuration usbg_config_driver = {
2019 .label = "Linux Target",
2020 .bConfigurationValue = 1,
2021 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2022 };
2023
2024 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2025 {
2026 struct f_uas *fu = to_f_uas(f);
2027 struct usb_gadget *gadget = c->cdev->gadget;
2028 struct usb_ep *ep;
2029 int iface;
2030 int ret;
2031
2032 iface = usb_interface_id(c, f);
2033 if (iface < 0)
2034 return iface;
2035
2036 bot_intf_desc.bInterfaceNumber = iface;
2037 uasp_intf_desc.bInterfaceNumber = iface;
2038 fu->iface = iface;
2039 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2040 &uasp_bi_ep_comp_desc);
2041 if (!ep)
2042 goto ep_fail;
2043 fu->ep_in = ep;
2044
2045 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2046 &uasp_bo_ep_comp_desc);
2047 if (!ep)
2048 goto ep_fail;
2049 fu->ep_out = ep;
2050
2051 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2052 &uasp_status_in_ep_comp_desc);
2053 if (!ep)
2054 goto ep_fail;
2055 fu->ep_status = ep;
2056
2057 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2058 &uasp_cmd_comp_desc);
2059 if (!ep)
2060 goto ep_fail;
2061 fu->ep_cmd = ep;
2062
2063 /* Assume endpoint addresses are the same for both speeds */
2064 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2065 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2066 uasp_status_desc.bEndpointAddress =
2067 uasp_ss_status_desc.bEndpointAddress;
2068 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2069
2070 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2071 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2072 uasp_fs_status_desc.bEndpointAddress =
2073 uasp_ss_status_desc.bEndpointAddress;
2074 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2075
2076 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2077 uasp_hs_function_desc, uasp_ss_function_desc);
2078 if (ret)
2079 goto ep_fail;
2080
2081 return 0;
2082 ep_fail:
2083 pr_err("Can't claim all required eps\n");
2084 return -ENOTSUPP;
2085 }
2086
2087 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2088 {
2089 struct f_uas *fu = to_f_uas(f);
2090
2091 usb_free_all_descriptors(f);
2092 kfree(fu);
2093 }
2094
2095 struct guas_setup_wq {
2096 struct work_struct work;
2097 struct f_uas *fu;
2098 unsigned int alt;
2099 };
2100
2101 static void usbg_delayed_set_alt(struct work_struct *wq)
2102 {
2103 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2104 work);
2105 struct f_uas *fu = work->fu;
2106 int alt = work->alt;
2107
2108 kfree(work);
2109
2110 if (fu->flags & USBG_IS_BOT)
2111 bot_cleanup_old_alt(fu);
2112 if (fu->flags & USBG_IS_UAS)
2113 uasp_cleanup_old_alt(fu);
2114
2115 if (alt == USB_G_ALT_INT_BBB)
2116 bot_set_alt(fu);
2117 else if (alt == USB_G_ALT_INT_UAS)
2118 uasp_set_alt(fu);
2119 usb_composite_setup_continue(fu->function.config->cdev);
2120 }
2121
2122 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2123 {
2124 struct f_uas *fu = to_f_uas(f);
2125
2126 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2127 struct guas_setup_wq *work;
2128
2129 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2130 if (!work)
2131 return -ENOMEM;
2132 INIT_WORK(&work->work, usbg_delayed_set_alt);
2133 work->fu = fu;
2134 work->alt = alt;
2135 schedule_work(&work->work);
2136 return USB_GADGET_DELAYED_STATUS;
2137 }
2138 return -EOPNOTSUPP;
2139 }
2140
2141 static void usbg_disable(struct usb_function *f)
2142 {
2143 struct f_uas *fu = to_f_uas(f);
2144
2145 if (fu->flags & USBG_IS_UAS)
2146 uasp_cleanup_old_alt(fu);
2147 else if (fu->flags & USBG_IS_BOT)
2148 bot_cleanup_old_alt(fu);
2149 fu->flags = 0;
2150 }
2151
2152 static int usbg_setup(struct usb_function *f,
2153 const struct usb_ctrlrequest *ctrl)
2154 {
2155 struct f_uas *fu = to_f_uas(f);
2156
2157 if (!(fu->flags & USBG_IS_BOT))
2158 return -EOPNOTSUPP;
2159
2160 return usbg_bot_setup(f, ctrl);
2161 }
2162
2163 static int usbg_cfg_bind(struct usb_configuration *c)
2164 {
2165 struct f_uas *fu;
2166 int ret;
2167
2168 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2169 if (!fu)
2170 return -ENOMEM;
2171 fu->function.name = "Target Function";
2172 fu->function.bind = usbg_bind;
2173 fu->function.unbind = usbg_unbind;
2174 fu->function.set_alt = usbg_set_alt;
2175 fu->function.setup = usbg_setup;
2176 fu->function.disable = usbg_disable;
2177 fu->tpg = the_only_tpg_I_currently_have;
2178
2179 bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2180 uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2181
2182 ret = usb_add_function(c, &fu->function);
2183 if (ret)
2184 goto err;
2185
2186 return 0;
2187 err:
2188 kfree(fu);
2189 return ret;
2190 }
2191
2192 static int usb_target_bind(struct usb_composite_dev *cdev)
2193 {
2194 int ret;
2195
2196 ret = usb_string_ids_tab(cdev, usbg_us_strings);
2197 if (ret)
2198 return ret;
2199
2200 usbg_device_desc.iManufacturer =
2201 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2202 usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2203 usbg_device_desc.iSerialNumber =
2204 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2205 usbg_config_driver.iConfiguration =
2206 usbg_us_strings[USB_G_STR_CONFIG].id;
2207
2208 ret = usb_add_config(cdev, &usbg_config_driver,
2209 usbg_cfg_bind);
2210 if (ret)
2211 return ret;
2212 usb_composite_overwrite_options(cdev, &coverwrite);
2213 return 0;
2214 }
2215
2216 static struct usb_composite_driver usbg_driver = {
2217 .name = "g_target",
2218 .dev = &usbg_device_desc,
2219 .strings = usbg_strings,
2220 .max_speed = USB_SPEED_SUPER,
2221 .bind = usb_target_bind,
2222 .unbind = guas_unbind,
2223 };
2224
2225 static int usbg_attach(struct usbg_tpg *tpg)
2226 {
2227 return usb_composite_probe(&usbg_driver);
2228 }
2229
2230 static void usbg_detach(struct usbg_tpg *tpg)
2231 {
2232 usb_composite_unregister(&usbg_driver);
2233 }
2234
2235 static int __init usb_target_gadget_init(void)
2236 {
2237 return target_register_template(&usbg_ops);
2238 }
2239 module_init(usb_target_gadget_init);
2240
2241 static void __exit usb_target_gadget_exit(void)
2242 {
2243 target_unregister_template(&usbg_ops);
2244 }
2245 module_exit(usb_target_gadget_exit);
2246
2247 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2248 MODULE_DESCRIPTION("usb-gadget fabric");
2249 MODULE_LICENSE("GPL v2");
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