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Merge tag 'pinctrl-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[mirror_ubuntu-zesty-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.h>
20 #include <scsi/scsi_tcq.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/target_core_fabric_configfs.h>
24 #include <target/target_core_configfs.h>
25 #include <target/configfs_macros.h>
26 #include <asm/unaligned.h>
27
28 #include "tcm_usb_gadget.h"
29
30 USB_GADGET_COMPOSITE_OPTIONS();
31
32 static struct target_fabric_configfs *usbg_fabric_configfs;
33
34 static inline struct f_uas *to_f_uas(struct usb_function *f)
35 {
36 return container_of(f, struct f_uas, function);
37 }
38
39 static void usbg_cmd_release(struct kref *);
40
41 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
42 {
43 kref_put(&cmd->ref, usbg_cmd_release);
44 }
45
46 /* Start bot.c code */
47
48 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
49 {
50 int ret;
51
52 if (fu->flags & USBG_BOT_CMD_PEND)
53 return 0;
54
55 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
56 if (!ret)
57 fu->flags |= USBG_BOT_CMD_PEND;
58 return ret;
59 }
60
61 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
62 {
63 struct usbg_cmd *cmd = req->context;
64 struct f_uas *fu = cmd->fu;
65
66 usbg_cleanup_cmd(cmd);
67 if (req->status < 0) {
68 pr_err("ERR %s(%d)\n", __func__, __LINE__);
69 return;
70 }
71
72 /* CSW completed, wait for next CBW */
73 bot_enqueue_cmd_cbw(fu);
74 }
75
76 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
77 {
78 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
79 int ret;
80 u8 *sense;
81 unsigned int csw_stat;
82
83 csw_stat = cmd->csw_code;
84
85 /*
86 * We can't send SENSE as a response. So we take ASC & ASCQ from our
87 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
88 * command where it learns why we failed.
89 */
90 sense = cmd->sense_iu.sense;
91
92 csw->Tag = cmd->bot_tag;
93 csw->Status = csw_stat;
94 fu->bot_status.req->context = cmd;
95 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
96 if (ret)
97 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
98 }
99
100 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
101 {
102 struct usbg_cmd *cmd = req->context;
103 struct f_uas *fu = cmd->fu;
104
105 if (req->status < 0)
106 pr_err("ERR %s(%d)\n", __func__, __LINE__);
107
108 if (cmd->data_len) {
109 if (cmd->data_len > ep->maxpacket) {
110 req->length = ep->maxpacket;
111 cmd->data_len -= ep->maxpacket;
112 } else {
113 req->length = cmd->data_len;
114 cmd->data_len = 0;
115 }
116
117 usb_ep_queue(ep, req, GFP_ATOMIC);
118 return ;
119 }
120 bot_enqueue_sense_code(fu, cmd);
121 }
122
123 static void bot_send_bad_status(struct usbg_cmd *cmd)
124 {
125 struct f_uas *fu = cmd->fu;
126 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
127 struct usb_request *req;
128 struct usb_ep *ep;
129
130 csw->Residue = cpu_to_le32(cmd->data_len);
131
132 if (cmd->data_len) {
133 if (cmd->is_read) {
134 ep = fu->ep_in;
135 req = fu->bot_req_in;
136 } else {
137 ep = fu->ep_out;
138 req = fu->bot_req_out;
139 }
140
141 if (cmd->data_len > fu->ep_in->maxpacket) {
142 req->length = ep->maxpacket;
143 cmd->data_len -= ep->maxpacket;
144 } else {
145 req->length = cmd->data_len;
146 cmd->data_len = 0;
147 }
148 req->complete = bot_err_compl;
149 req->context = cmd;
150 req->buf = fu->cmd.buf;
151 usb_ep_queue(ep, req, GFP_KERNEL);
152 } else {
153 bot_enqueue_sense_code(fu, cmd);
154 }
155 }
156
157 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
158 {
159 struct f_uas *fu = cmd->fu;
160 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
161 int ret;
162
163 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
164 if (!moved_data && cmd->data_len) {
165 /*
166 * the host wants to move data, we don't. Fill / empty
167 * the pipe and then send the csw with reside set.
168 */
169 cmd->csw_code = US_BULK_STAT_OK;
170 bot_send_bad_status(cmd);
171 return 0;
172 }
173
174 csw->Tag = cmd->bot_tag;
175 csw->Residue = cpu_to_le32(0);
176 csw->Status = US_BULK_STAT_OK;
177 fu->bot_status.req->context = cmd;
178
179 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
180 if (ret)
181 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
182 } else {
183 cmd->csw_code = US_BULK_STAT_FAIL;
184 bot_send_bad_status(cmd);
185 }
186 return 0;
187 }
188
189 /*
190 * Called after command (no data transfer) or after the write (to device)
191 * operation is completed
192 */
193 static int bot_send_status_response(struct usbg_cmd *cmd)
194 {
195 bool moved_data = false;
196
197 if (!cmd->is_read)
198 moved_data = true;
199 return bot_send_status(cmd, moved_data);
200 }
201
202 /* Read request completed, now we have to send the CSW */
203 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
204 {
205 struct usbg_cmd *cmd = req->context;
206
207 if (req->status < 0)
208 pr_err("ERR %s(%d)\n", __func__, __LINE__);
209
210 bot_send_status(cmd, true);
211 }
212
213 static int bot_send_read_response(struct usbg_cmd *cmd)
214 {
215 struct f_uas *fu = cmd->fu;
216 struct se_cmd *se_cmd = &cmd->se_cmd;
217 struct usb_gadget *gadget = fuas_to_gadget(fu);
218 int ret;
219
220 if (!cmd->data_len) {
221 cmd->csw_code = US_BULK_STAT_PHASE;
222 bot_send_bad_status(cmd);
223 return 0;
224 }
225
226 if (!gadget->sg_supported) {
227 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
228 if (!cmd->data_buf)
229 return -ENOMEM;
230
231 sg_copy_to_buffer(se_cmd->t_data_sg,
232 se_cmd->t_data_nents,
233 cmd->data_buf,
234 se_cmd->data_length);
235
236 fu->bot_req_in->buf = cmd->data_buf;
237 } else {
238 fu->bot_req_in->buf = NULL;
239 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
240 fu->bot_req_in->sg = se_cmd->t_data_sg;
241 }
242
243 fu->bot_req_in->complete = bot_read_compl;
244 fu->bot_req_in->length = se_cmd->data_length;
245 fu->bot_req_in->context = cmd;
246 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
247 if (ret)
248 pr_err("%s(%d)\n", __func__, __LINE__);
249 return 0;
250 }
251
252 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
253 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
254
255 static int bot_send_write_request(struct usbg_cmd *cmd)
256 {
257 struct f_uas *fu = cmd->fu;
258 struct se_cmd *se_cmd = &cmd->se_cmd;
259 struct usb_gadget *gadget = fuas_to_gadget(fu);
260 int ret;
261
262 init_completion(&cmd->write_complete);
263 cmd->fu = fu;
264
265 if (!cmd->data_len) {
266 cmd->csw_code = US_BULK_STAT_PHASE;
267 return -EINVAL;
268 }
269
270 if (!gadget->sg_supported) {
271 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
272 if (!cmd->data_buf)
273 return -ENOMEM;
274
275 fu->bot_req_out->buf = cmd->data_buf;
276 } else {
277 fu->bot_req_out->buf = NULL;
278 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
279 fu->bot_req_out->sg = se_cmd->t_data_sg;
280 }
281
282 fu->bot_req_out->complete = usbg_data_write_cmpl;
283 fu->bot_req_out->length = se_cmd->data_length;
284 fu->bot_req_out->context = cmd;
285
286 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
287 if (ret)
288 goto cleanup;
289 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
290 if (ret)
291 pr_err("%s(%d)\n", __func__, __LINE__);
292
293 wait_for_completion(&cmd->write_complete);
294 target_execute_cmd(se_cmd);
295 cleanup:
296 return ret;
297 }
298
299 static int bot_submit_command(struct f_uas *, void *, unsigned int);
300
301 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
302 {
303 struct f_uas *fu = req->context;
304 int ret;
305
306 fu->flags &= ~USBG_BOT_CMD_PEND;
307
308 if (req->status < 0)
309 return;
310
311 ret = bot_submit_command(fu, req->buf, req->actual);
312 if (ret)
313 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
314 }
315
316 static int bot_prepare_reqs(struct f_uas *fu)
317 {
318 int ret;
319
320 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
321 if (!fu->bot_req_in)
322 goto err;
323
324 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
325 if (!fu->bot_req_out)
326 goto err_out;
327
328 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
329 if (!fu->cmd.req)
330 goto err_cmd;
331
332 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
333 if (!fu->bot_status.req)
334 goto err_sts;
335
336 fu->bot_status.req->buf = &fu->bot_status.csw;
337 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
338 fu->bot_status.req->complete = bot_status_complete;
339 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
340
341 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
342 if (!fu->cmd.buf)
343 goto err_buf;
344
345 fu->cmd.req->complete = bot_cmd_complete;
346 fu->cmd.req->buf = fu->cmd.buf;
347 fu->cmd.req->length = fu->ep_out->maxpacket;
348 fu->cmd.req->context = fu;
349
350 ret = bot_enqueue_cmd_cbw(fu);
351 if (ret)
352 goto err_queue;
353 return 0;
354 err_queue:
355 kfree(fu->cmd.buf);
356 fu->cmd.buf = NULL;
357 err_buf:
358 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
359 err_sts:
360 usb_ep_free_request(fu->ep_out, fu->cmd.req);
361 fu->cmd.req = NULL;
362 err_cmd:
363 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
364 fu->bot_req_out = NULL;
365 err_out:
366 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
367 fu->bot_req_in = NULL;
368 err:
369 pr_err("BOT: endpoint setup failed\n");
370 return -ENOMEM;
371 }
372
373 static void bot_cleanup_old_alt(struct f_uas *fu)
374 {
375 if (!(fu->flags & USBG_ENABLED))
376 return;
377
378 usb_ep_disable(fu->ep_in);
379 usb_ep_disable(fu->ep_out);
380
381 if (!fu->bot_req_in)
382 return;
383
384 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
385 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
386 usb_ep_free_request(fu->ep_out, fu->cmd.req);
387 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
388
389 kfree(fu->cmd.buf);
390
391 fu->bot_req_in = NULL;
392 fu->bot_req_out = NULL;
393 fu->cmd.req = NULL;
394 fu->bot_status.req = NULL;
395 fu->cmd.buf = NULL;
396 }
397
398 static void bot_set_alt(struct f_uas *fu)
399 {
400 struct usb_function *f = &fu->function;
401 struct usb_gadget *gadget = f->config->cdev->gadget;
402 int ret;
403
404 fu->flags = USBG_IS_BOT;
405
406 config_ep_by_speed(gadget, f, fu->ep_in);
407 ret = usb_ep_enable(fu->ep_in);
408 if (ret)
409 goto err_b_in;
410
411 config_ep_by_speed(gadget, f, fu->ep_out);
412 ret = usb_ep_enable(fu->ep_out);
413 if (ret)
414 goto err_b_out;
415
416 ret = bot_prepare_reqs(fu);
417 if (ret)
418 goto err_wq;
419 fu->flags |= USBG_ENABLED;
420 pr_info("Using the BOT protocol\n");
421 return;
422 err_wq:
423 usb_ep_disable(fu->ep_out);
424 err_b_out:
425 usb_ep_disable(fu->ep_in);
426 err_b_in:
427 fu->flags = USBG_IS_BOT;
428 }
429
430 static int usbg_bot_setup(struct usb_function *f,
431 const struct usb_ctrlrequest *ctrl)
432 {
433 struct f_uas *fu = to_f_uas(f);
434 struct usb_composite_dev *cdev = f->config->cdev;
435 u16 w_value = le16_to_cpu(ctrl->wValue);
436 u16 w_length = le16_to_cpu(ctrl->wLength);
437 int luns;
438 u8 *ret_lun;
439
440 switch (ctrl->bRequest) {
441 case US_BULK_GET_MAX_LUN:
442 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
443 USB_RECIP_INTERFACE))
444 return -ENOTSUPP;
445
446 if (w_length < 1)
447 return -EINVAL;
448 if (w_value != 0)
449 return -EINVAL;
450 luns = atomic_read(&fu->tpg->tpg_port_count);
451 if (!luns) {
452 pr_err("No LUNs configured?\n");
453 return -EINVAL;
454 }
455 /*
456 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
457 * accessed. The upper limit is 0xf
458 */
459 luns--;
460 if (luns > 0xf) {
461 pr_info_once("Limiting the number of luns to 16\n");
462 luns = 0xf;
463 }
464 ret_lun = cdev->req->buf;
465 *ret_lun = luns;
466 cdev->req->length = 1;
467 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
468 break;
469
470 case US_BULK_RESET_REQUEST:
471 /* XXX maybe we should remove previous requests for IN + OUT */
472 bot_enqueue_cmd_cbw(fu);
473 return 0;
474 break;
475 }
476 return -ENOTSUPP;
477 }
478
479 /* Start uas.c code */
480
481 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
482 {
483 /* We have either all three allocated or none */
484 if (!stream->req_in)
485 return;
486
487 usb_ep_free_request(fu->ep_in, stream->req_in);
488 usb_ep_free_request(fu->ep_out, stream->req_out);
489 usb_ep_free_request(fu->ep_status, stream->req_status);
490
491 stream->req_in = NULL;
492 stream->req_out = NULL;
493 stream->req_status = NULL;
494 }
495
496 static void uasp_free_cmdreq(struct f_uas *fu)
497 {
498 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
499 kfree(fu->cmd.buf);
500 fu->cmd.req = NULL;
501 fu->cmd.buf = NULL;
502 }
503
504 static void uasp_cleanup_old_alt(struct f_uas *fu)
505 {
506 int i;
507
508 if (!(fu->flags & USBG_ENABLED))
509 return;
510
511 usb_ep_disable(fu->ep_in);
512 usb_ep_disable(fu->ep_out);
513 usb_ep_disable(fu->ep_status);
514 usb_ep_disable(fu->ep_cmd);
515
516 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
517 uasp_cleanup_one_stream(fu, &fu->stream[i]);
518 uasp_free_cmdreq(fu);
519 }
520
521 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
522
523 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
524 {
525 struct se_cmd *se_cmd = &cmd->se_cmd;
526 struct f_uas *fu = cmd->fu;
527 struct usb_gadget *gadget = fuas_to_gadget(fu);
528 struct uas_stream *stream = cmd->stream;
529
530 if (!gadget->sg_supported) {
531 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
532 if (!cmd->data_buf)
533 return -ENOMEM;
534
535 sg_copy_to_buffer(se_cmd->t_data_sg,
536 se_cmd->t_data_nents,
537 cmd->data_buf,
538 se_cmd->data_length);
539
540 stream->req_in->buf = cmd->data_buf;
541 } else {
542 stream->req_in->buf = NULL;
543 stream->req_in->num_sgs = se_cmd->t_data_nents;
544 stream->req_in->sg = se_cmd->t_data_sg;
545 }
546
547 stream->req_in->complete = uasp_status_data_cmpl;
548 stream->req_in->length = se_cmd->data_length;
549 stream->req_in->context = cmd;
550
551 cmd->state = UASP_SEND_STATUS;
552 return 0;
553 }
554
555 static void uasp_prepare_status(struct usbg_cmd *cmd)
556 {
557 struct se_cmd *se_cmd = &cmd->se_cmd;
558 struct sense_iu *iu = &cmd->sense_iu;
559 struct uas_stream *stream = cmd->stream;
560
561 cmd->state = UASP_QUEUE_COMMAND;
562 iu->iu_id = IU_ID_STATUS;
563 iu->tag = cpu_to_be16(cmd->tag);
564
565 /*
566 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
567 */
568 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
569 iu->status = se_cmd->scsi_status;
570 stream->req_status->context = cmd;
571 stream->req_status->length = se_cmd->scsi_sense_length + 16;
572 stream->req_status->buf = iu;
573 stream->req_status->complete = uasp_status_data_cmpl;
574 }
575
576 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
577 {
578 struct usbg_cmd *cmd = req->context;
579 struct uas_stream *stream = cmd->stream;
580 struct f_uas *fu = cmd->fu;
581 int ret;
582
583 if (req->status < 0)
584 goto cleanup;
585
586 switch (cmd->state) {
587 case UASP_SEND_DATA:
588 ret = uasp_prepare_r_request(cmd);
589 if (ret)
590 goto cleanup;
591 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
592 if (ret)
593 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
594 break;
595
596 case UASP_RECEIVE_DATA:
597 ret = usbg_prepare_w_request(cmd, stream->req_out);
598 if (ret)
599 goto cleanup;
600 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
601 if (ret)
602 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
603 break;
604
605 case UASP_SEND_STATUS:
606 uasp_prepare_status(cmd);
607 ret = usb_ep_queue(fu->ep_status, stream->req_status,
608 GFP_ATOMIC);
609 if (ret)
610 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
611 break;
612
613 case UASP_QUEUE_COMMAND:
614 usbg_cleanup_cmd(cmd);
615 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
616 break;
617
618 default:
619 BUG();
620 }
621 return;
622
623 cleanup:
624 usbg_cleanup_cmd(cmd);
625 }
626
627 static int uasp_send_status_response(struct usbg_cmd *cmd)
628 {
629 struct f_uas *fu = cmd->fu;
630 struct uas_stream *stream = cmd->stream;
631 struct sense_iu *iu = &cmd->sense_iu;
632
633 iu->tag = cpu_to_be16(cmd->tag);
634 stream->req_status->complete = uasp_status_data_cmpl;
635 stream->req_status->context = cmd;
636 cmd->fu = fu;
637 uasp_prepare_status(cmd);
638 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
639 }
640
641 static int uasp_send_read_response(struct usbg_cmd *cmd)
642 {
643 struct f_uas *fu = cmd->fu;
644 struct uas_stream *stream = cmd->stream;
645 struct sense_iu *iu = &cmd->sense_iu;
646 int ret;
647
648 cmd->fu = fu;
649
650 iu->tag = cpu_to_be16(cmd->tag);
651 if (fu->flags & USBG_USE_STREAMS) {
652
653 ret = uasp_prepare_r_request(cmd);
654 if (ret)
655 goto out;
656 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
657 if (ret) {
658 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
659 kfree(cmd->data_buf);
660 cmd->data_buf = NULL;
661 }
662
663 } else {
664
665 iu->iu_id = IU_ID_READ_READY;
666 iu->tag = cpu_to_be16(cmd->tag);
667
668 stream->req_status->complete = uasp_status_data_cmpl;
669 stream->req_status->context = cmd;
670
671 cmd->state = UASP_SEND_DATA;
672 stream->req_status->buf = iu;
673 stream->req_status->length = sizeof(struct iu);
674
675 ret = usb_ep_queue(fu->ep_status, stream->req_status,
676 GFP_ATOMIC);
677 if (ret)
678 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
679 }
680 out:
681 return ret;
682 }
683
684 static int uasp_send_write_request(struct usbg_cmd *cmd)
685 {
686 struct f_uas *fu = cmd->fu;
687 struct se_cmd *se_cmd = &cmd->se_cmd;
688 struct uas_stream *stream = cmd->stream;
689 struct sense_iu *iu = &cmd->sense_iu;
690 int ret;
691
692 init_completion(&cmd->write_complete);
693 cmd->fu = fu;
694
695 iu->tag = cpu_to_be16(cmd->tag);
696
697 if (fu->flags & USBG_USE_STREAMS) {
698
699 ret = usbg_prepare_w_request(cmd, stream->req_out);
700 if (ret)
701 goto cleanup;
702 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
703 if (ret)
704 pr_err("%s(%d)\n", __func__, __LINE__);
705
706 } else {
707
708 iu->iu_id = IU_ID_WRITE_READY;
709 iu->tag = cpu_to_be16(cmd->tag);
710
711 stream->req_status->complete = uasp_status_data_cmpl;
712 stream->req_status->context = cmd;
713
714 cmd->state = UASP_RECEIVE_DATA;
715 stream->req_status->buf = iu;
716 stream->req_status->length = sizeof(struct iu);
717
718 ret = usb_ep_queue(fu->ep_status, stream->req_status,
719 GFP_ATOMIC);
720 if (ret)
721 pr_err("%s(%d)\n", __func__, __LINE__);
722 }
723
724 wait_for_completion(&cmd->write_complete);
725 target_execute_cmd(se_cmd);
726 cleanup:
727 return ret;
728 }
729
730 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
731
732 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
733 {
734 struct f_uas *fu = req->context;
735 int ret;
736
737 if (req->status < 0)
738 return;
739
740 ret = usbg_submit_command(fu, req->buf, req->actual);
741 /*
742 * Once we tune for performance enqueue the command req here again so
743 * we can receive a second command while we processing this one. Pay
744 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
745 * don't break HS.
746 */
747 if (!ret)
748 return;
749 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
750 }
751
752 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
753 {
754 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
755 if (!stream->req_in)
756 goto out;
757
758 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
759 if (!stream->req_out)
760 goto err_out;
761
762 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
763 if (!stream->req_status)
764 goto err_sts;
765
766 return 0;
767 err_sts:
768 usb_ep_free_request(fu->ep_status, stream->req_status);
769 stream->req_status = NULL;
770 err_out:
771 usb_ep_free_request(fu->ep_out, stream->req_out);
772 stream->req_out = NULL;
773 out:
774 return -ENOMEM;
775 }
776
777 static int uasp_alloc_cmd(struct f_uas *fu)
778 {
779 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
780 if (!fu->cmd.req)
781 goto err;
782
783 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
784 if (!fu->cmd.buf)
785 goto err_buf;
786
787 fu->cmd.req->complete = uasp_cmd_complete;
788 fu->cmd.req->buf = fu->cmd.buf;
789 fu->cmd.req->length = fu->ep_cmd->maxpacket;
790 fu->cmd.req->context = fu;
791 return 0;
792
793 err_buf:
794 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
795 err:
796 return -ENOMEM;
797 }
798
799 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
800 {
801 int i;
802
803 for (i = 0; i < max_streams; i++) {
804 struct uas_stream *s = &fu->stream[i];
805
806 s->req_in->stream_id = i + 1;
807 s->req_out->stream_id = i + 1;
808 s->req_status->stream_id = i + 1;
809 }
810 }
811
812 static int uasp_prepare_reqs(struct f_uas *fu)
813 {
814 int ret;
815 int i;
816 int max_streams;
817
818 if (fu->flags & USBG_USE_STREAMS)
819 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
820 else
821 max_streams = 1;
822
823 for (i = 0; i < max_streams; i++) {
824 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
825 if (ret)
826 goto err_cleanup;
827 }
828
829 ret = uasp_alloc_cmd(fu);
830 if (ret)
831 goto err_free_stream;
832 uasp_setup_stream_res(fu, max_streams);
833
834 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
835 if (ret)
836 goto err_free_stream;
837
838 return 0;
839
840 err_free_stream:
841 uasp_free_cmdreq(fu);
842
843 err_cleanup:
844 if (i) {
845 do {
846 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
847 i--;
848 } while (i);
849 }
850 pr_err("UASP: endpoint setup failed\n");
851 return ret;
852 }
853
854 static void uasp_set_alt(struct f_uas *fu)
855 {
856 struct usb_function *f = &fu->function;
857 struct usb_gadget *gadget = f->config->cdev->gadget;
858 int ret;
859
860 fu->flags = USBG_IS_UAS;
861
862 if (gadget->speed == USB_SPEED_SUPER)
863 fu->flags |= USBG_USE_STREAMS;
864
865 config_ep_by_speed(gadget, f, fu->ep_in);
866 ret = usb_ep_enable(fu->ep_in);
867 if (ret)
868 goto err_b_in;
869
870 config_ep_by_speed(gadget, f, fu->ep_out);
871 ret = usb_ep_enable(fu->ep_out);
872 if (ret)
873 goto err_b_out;
874
875 config_ep_by_speed(gadget, f, fu->ep_cmd);
876 ret = usb_ep_enable(fu->ep_cmd);
877 if (ret)
878 goto err_cmd;
879 config_ep_by_speed(gadget, f, fu->ep_status);
880 ret = usb_ep_enable(fu->ep_status);
881 if (ret)
882 goto err_status;
883
884 ret = uasp_prepare_reqs(fu);
885 if (ret)
886 goto err_wq;
887 fu->flags |= USBG_ENABLED;
888
889 pr_info("Using the UAS protocol\n");
890 return;
891 err_wq:
892 usb_ep_disable(fu->ep_status);
893 err_status:
894 usb_ep_disable(fu->ep_cmd);
895 err_cmd:
896 usb_ep_disable(fu->ep_out);
897 err_b_out:
898 usb_ep_disable(fu->ep_in);
899 err_b_in:
900 fu->flags = 0;
901 }
902
903 static int get_cmd_dir(const unsigned char *cdb)
904 {
905 int ret;
906
907 switch (cdb[0]) {
908 case READ_6:
909 case READ_10:
910 case READ_12:
911 case READ_16:
912 case INQUIRY:
913 case MODE_SENSE:
914 case MODE_SENSE_10:
915 case SERVICE_ACTION_IN_16:
916 case MAINTENANCE_IN:
917 case PERSISTENT_RESERVE_IN:
918 case SECURITY_PROTOCOL_IN:
919 case ACCESS_CONTROL_IN:
920 case REPORT_LUNS:
921 case READ_BLOCK_LIMITS:
922 case READ_POSITION:
923 case READ_CAPACITY:
924 case READ_TOC:
925 case READ_FORMAT_CAPACITIES:
926 case REQUEST_SENSE:
927 ret = DMA_FROM_DEVICE;
928 break;
929
930 case WRITE_6:
931 case WRITE_10:
932 case WRITE_12:
933 case WRITE_16:
934 case MODE_SELECT:
935 case MODE_SELECT_10:
936 case WRITE_VERIFY:
937 case WRITE_VERIFY_12:
938 case PERSISTENT_RESERVE_OUT:
939 case MAINTENANCE_OUT:
940 case SECURITY_PROTOCOL_OUT:
941 case ACCESS_CONTROL_OUT:
942 ret = DMA_TO_DEVICE;
943 break;
944 case ALLOW_MEDIUM_REMOVAL:
945 case TEST_UNIT_READY:
946 case SYNCHRONIZE_CACHE:
947 case START_STOP:
948 case ERASE:
949 case REZERO_UNIT:
950 case SEEK_10:
951 case SPACE:
952 case VERIFY:
953 case WRITE_FILEMARKS:
954 ret = DMA_NONE;
955 break;
956 default:
957 pr_warn("target: Unknown data direction for SCSI Opcode "
958 "0x%02x\n", cdb[0]);
959 ret = -EINVAL;
960 }
961 return ret;
962 }
963
964 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
965 {
966 struct usbg_cmd *cmd = req->context;
967 struct se_cmd *se_cmd = &cmd->se_cmd;
968
969 if (req->status < 0) {
970 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
971 goto cleanup;
972 }
973
974 if (req->num_sgs == 0) {
975 sg_copy_from_buffer(se_cmd->t_data_sg,
976 se_cmd->t_data_nents,
977 cmd->data_buf,
978 se_cmd->data_length);
979 }
980
981 complete(&cmd->write_complete);
982 return;
983
984 cleanup:
985 usbg_cleanup_cmd(cmd);
986 }
987
988 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
989 {
990 struct se_cmd *se_cmd = &cmd->se_cmd;
991 struct f_uas *fu = cmd->fu;
992 struct usb_gadget *gadget = fuas_to_gadget(fu);
993
994 if (!gadget->sg_supported) {
995 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
996 if (!cmd->data_buf)
997 return -ENOMEM;
998
999 req->buf = cmd->data_buf;
1000 } else {
1001 req->buf = NULL;
1002 req->num_sgs = se_cmd->t_data_nents;
1003 req->sg = se_cmd->t_data_sg;
1004 }
1005
1006 req->complete = usbg_data_write_cmpl;
1007 req->length = se_cmd->data_length;
1008 req->context = cmd;
1009 return 0;
1010 }
1011
1012 static int usbg_send_status_response(struct se_cmd *se_cmd)
1013 {
1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015 se_cmd);
1016 struct f_uas *fu = cmd->fu;
1017
1018 if (fu->flags & USBG_IS_BOT)
1019 return bot_send_status_response(cmd);
1020 else
1021 return uasp_send_status_response(cmd);
1022 }
1023
1024 static int usbg_send_write_request(struct se_cmd *se_cmd)
1025 {
1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027 se_cmd);
1028 struct f_uas *fu = cmd->fu;
1029
1030 if (fu->flags & USBG_IS_BOT)
1031 return bot_send_write_request(cmd);
1032 else
1033 return uasp_send_write_request(cmd);
1034 }
1035
1036 static int usbg_send_read_response(struct se_cmd *se_cmd)
1037 {
1038 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1039 se_cmd);
1040 struct f_uas *fu = cmd->fu;
1041
1042 if (fu->flags & USBG_IS_BOT)
1043 return bot_send_read_response(cmd);
1044 else
1045 return uasp_send_read_response(cmd);
1046 }
1047
1048 static void usbg_cmd_work(struct work_struct *work)
1049 {
1050 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1051 struct se_cmd *se_cmd;
1052 struct tcm_usbg_nexus *tv_nexus;
1053 struct usbg_tpg *tpg;
1054 int dir;
1055
1056 se_cmd = &cmd->se_cmd;
1057 tpg = cmd->fu->tpg;
1058 tv_nexus = tpg->tpg_nexus;
1059 dir = get_cmd_dir(cmd->cmd_buf);
1060 if (dir < 0) {
1061 transport_init_se_cmd(se_cmd,
1062 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1063 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1064 cmd->prio_attr, cmd->sense_iu.sense);
1065 goto out;
1066 }
1067
1068 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1069 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1070 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1071 goto out;
1072
1073 return;
1074
1075 out:
1076 transport_send_check_condition_and_sense(se_cmd,
1077 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1078 usbg_cleanup_cmd(cmd);
1079 }
1080
1081 static int usbg_submit_command(struct f_uas *fu,
1082 void *cmdbuf, unsigned int len)
1083 {
1084 struct command_iu *cmd_iu = cmdbuf;
1085 struct usbg_cmd *cmd;
1086 struct usbg_tpg *tpg;
1087 struct se_cmd *se_cmd;
1088 struct tcm_usbg_nexus *tv_nexus;
1089 u32 cmd_len;
1090 int ret;
1091
1092 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1093 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1094 return -EINVAL;
1095 }
1096
1097 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1098 if (!cmd)
1099 return -ENOMEM;
1100
1101 cmd->fu = fu;
1102
1103 /* XXX until I figure out why I can't free in on complete */
1104 kref_init(&cmd->ref);
1105 kref_get(&cmd->ref);
1106
1107 tpg = fu->tpg;
1108 cmd_len = (cmd_iu->len & ~0x3) + 16;
1109 if (cmd_len > USBG_MAX_CMD)
1110 goto err;
1111
1112 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1113
1114 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1115 if (fu->flags & USBG_USE_STREAMS) {
1116 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1117 goto err;
1118 if (!cmd->tag)
1119 cmd->stream = &fu->stream[0];
1120 else
1121 cmd->stream = &fu->stream[cmd->tag - 1];
1122 } else {
1123 cmd->stream = &fu->stream[0];
1124 }
1125
1126 tv_nexus = tpg->tpg_nexus;
1127 if (!tv_nexus) {
1128 pr_err("Missing nexus, ignoring command\n");
1129 goto err;
1130 }
1131
1132 switch (cmd_iu->prio_attr & 0x7) {
1133 case UAS_HEAD_TAG:
1134 cmd->prio_attr = TCM_HEAD_TAG;
1135 break;
1136 case UAS_ORDERED_TAG:
1137 cmd->prio_attr = TCM_ORDERED_TAG;
1138 break;
1139 case UAS_ACA:
1140 cmd->prio_attr = TCM_ACA_TAG;
1141 break;
1142 default:
1143 pr_debug_once("Unsupported prio_attr: %02x.\n",
1144 cmd_iu->prio_attr);
1145 case UAS_SIMPLE_TAG:
1146 cmd->prio_attr = TCM_SIMPLE_TAG;
1147 break;
1148 }
1149
1150 se_cmd = &cmd->se_cmd;
1151 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1152
1153 INIT_WORK(&cmd->work, usbg_cmd_work);
1154 ret = queue_work(tpg->workqueue, &cmd->work);
1155 if (ret < 0)
1156 goto err;
1157
1158 return 0;
1159 err:
1160 kfree(cmd);
1161 return -EINVAL;
1162 }
1163
1164 static void bot_cmd_work(struct work_struct *work)
1165 {
1166 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167 struct se_cmd *se_cmd;
1168 struct tcm_usbg_nexus *tv_nexus;
1169 struct usbg_tpg *tpg;
1170 int dir;
1171
1172 se_cmd = &cmd->se_cmd;
1173 tpg = cmd->fu->tpg;
1174 tv_nexus = tpg->tpg_nexus;
1175 dir = get_cmd_dir(cmd->cmd_buf);
1176 if (dir < 0) {
1177 transport_init_se_cmd(se_cmd,
1178 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180 cmd->prio_attr, cmd->sense_iu.sense);
1181 goto out;
1182 }
1183
1184 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1185 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1186 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187 goto out;
1188
1189 return;
1190
1191 out:
1192 transport_send_check_condition_and_sense(se_cmd,
1193 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194 usbg_cleanup_cmd(cmd);
1195 }
1196
1197 static int bot_submit_command(struct f_uas *fu,
1198 void *cmdbuf, unsigned int len)
1199 {
1200 struct bulk_cb_wrap *cbw = cmdbuf;
1201 struct usbg_cmd *cmd;
1202 struct usbg_tpg *tpg;
1203 struct se_cmd *se_cmd;
1204 struct tcm_usbg_nexus *tv_nexus;
1205 u32 cmd_len;
1206 int ret;
1207
1208 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1209 pr_err("Wrong signature on CBW\n");
1210 return -EINVAL;
1211 }
1212 if (len != 31) {
1213 pr_err("Wrong length for CBW\n");
1214 return -EINVAL;
1215 }
1216
1217 cmd_len = cbw->Length;
1218 if (cmd_len < 1 || cmd_len > 16)
1219 return -EINVAL;
1220
1221 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1222 if (!cmd)
1223 return -ENOMEM;
1224
1225 cmd->fu = fu;
1226
1227 /* XXX until I figure out why I can't free in on complete */
1228 kref_init(&cmd->ref);
1229 kref_get(&cmd->ref);
1230
1231 tpg = fu->tpg;
1232
1233 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1234
1235 cmd->bot_tag = cbw->Tag;
1236
1237 tv_nexus = tpg->tpg_nexus;
1238 if (!tv_nexus) {
1239 pr_err("Missing nexus, ignoring command\n");
1240 goto err;
1241 }
1242
1243 cmd->prio_attr = TCM_SIMPLE_TAG;
1244 se_cmd = &cmd->se_cmd;
1245 cmd->unpacked_lun = cbw->Lun;
1246 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1247 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1248
1249 INIT_WORK(&cmd->work, bot_cmd_work);
1250 ret = queue_work(tpg->workqueue, &cmd->work);
1251 if (ret < 0)
1252 goto err;
1253
1254 return 0;
1255 err:
1256 kfree(cmd);
1257 return -EINVAL;
1258 }
1259
1260 /* Start fabric.c code */
1261
1262 static int usbg_check_true(struct se_portal_group *se_tpg)
1263 {
1264 return 1;
1265 }
1266
1267 static int usbg_check_false(struct se_portal_group *se_tpg)
1268 {
1269 return 0;
1270 }
1271
1272 static char *usbg_get_fabric_name(void)
1273 {
1274 return "usb_gadget";
1275 }
1276
1277 static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1278 {
1279 struct usbg_tpg *tpg = container_of(se_tpg,
1280 struct usbg_tpg, se_tpg);
1281 struct usbg_tport *tport = tpg->tport;
1282 u8 proto_id;
1283
1284 switch (tport->tport_proto_id) {
1285 case SCSI_PROTOCOL_SAS:
1286 default:
1287 proto_id = sas_get_fabric_proto_ident(se_tpg);
1288 break;
1289 }
1290
1291 return proto_id;
1292 }
1293
1294 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1295 {
1296 struct usbg_tpg *tpg = container_of(se_tpg,
1297 struct usbg_tpg, se_tpg);
1298 struct usbg_tport *tport = tpg->tport;
1299
1300 return &tport->tport_name[0];
1301 }
1302
1303 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1304 {
1305 struct usbg_tpg *tpg = container_of(se_tpg,
1306 struct usbg_tpg, se_tpg);
1307 return tpg->tport_tpgt;
1308 }
1309
1310 static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1311 {
1312 return 1;
1313 }
1314
1315 static u32 usbg_get_pr_transport_id(
1316 struct se_portal_group *se_tpg,
1317 struct se_node_acl *se_nacl,
1318 struct t10_pr_registration *pr_reg,
1319 int *format_code,
1320 unsigned char *buf)
1321 {
1322 struct usbg_tpg *tpg = container_of(se_tpg,
1323 struct usbg_tpg, se_tpg);
1324 struct usbg_tport *tport = tpg->tport;
1325 int ret = 0;
1326
1327 switch (tport->tport_proto_id) {
1328 case SCSI_PROTOCOL_SAS:
1329 default:
1330 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1331 format_code, buf);
1332 break;
1333 }
1334
1335 return ret;
1336 }
1337
1338 static u32 usbg_get_pr_transport_id_len(
1339 struct se_portal_group *se_tpg,
1340 struct se_node_acl *se_nacl,
1341 struct t10_pr_registration *pr_reg,
1342 int *format_code)
1343 {
1344 struct usbg_tpg *tpg = container_of(se_tpg,
1345 struct usbg_tpg, se_tpg);
1346 struct usbg_tport *tport = tpg->tport;
1347 int ret = 0;
1348
1349 switch (tport->tport_proto_id) {
1350 case SCSI_PROTOCOL_SAS:
1351 default:
1352 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1353 format_code);
1354 break;
1355 }
1356
1357 return ret;
1358 }
1359
1360 static char *usbg_parse_pr_out_transport_id(
1361 struct se_portal_group *se_tpg,
1362 const char *buf,
1363 u32 *out_tid_len,
1364 char **port_nexus_ptr)
1365 {
1366 struct usbg_tpg *tpg = container_of(se_tpg,
1367 struct usbg_tpg, se_tpg);
1368 struct usbg_tport *tport = tpg->tport;
1369 char *tid = NULL;
1370
1371 switch (tport->tport_proto_id) {
1372 case SCSI_PROTOCOL_SAS:
1373 default:
1374 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375 port_nexus_ptr);
1376 }
1377
1378 return tid;
1379 }
1380
1381 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1382 {
1383 struct usbg_nacl *nacl;
1384
1385 nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1386 if (!nacl)
1387 return NULL;
1388
1389 return &nacl->se_node_acl;
1390 }
1391
1392 static void usbg_release_fabric_acl(
1393 struct se_portal_group *se_tpg,
1394 struct se_node_acl *se_nacl)
1395 {
1396 struct usbg_nacl *nacl = container_of(se_nacl,
1397 struct usbg_nacl, se_node_acl);
1398 kfree(nacl);
1399 }
1400
1401 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1402 {
1403 return 1;
1404 }
1405
1406 static void usbg_cmd_release(struct kref *ref)
1407 {
1408 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1409 ref);
1410
1411 transport_generic_free_cmd(&cmd->se_cmd, 0);
1412 }
1413
1414 static void usbg_release_cmd(struct se_cmd *se_cmd)
1415 {
1416 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1417 se_cmd);
1418 kfree(cmd->data_buf);
1419 kfree(cmd);
1420 return;
1421 }
1422
1423 static int usbg_shutdown_session(struct se_session *se_sess)
1424 {
1425 return 0;
1426 }
1427
1428 static void usbg_close_session(struct se_session *se_sess)
1429 {
1430 return;
1431 }
1432
1433 static u32 usbg_sess_get_index(struct se_session *se_sess)
1434 {
1435 return 0;
1436 }
1437
1438 /*
1439 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1440 */
1441 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1442 {
1443 return 0;
1444 }
1445
1446 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1447 {
1448 return;
1449 }
1450
1451 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1452 {
1453 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1454 se_cmd);
1455 struct f_uas *fu = cmd->fu;
1456
1457 if (fu->flags & USBG_IS_BOT)
1458 return le32_to_cpu(cmd->bot_tag);
1459 else
1460 return cmd->tag;
1461 }
1462
1463 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1464 {
1465 return 0;
1466 }
1467
1468 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1469 {
1470 }
1471
1472 static void usbg_aborted_task(struct se_cmd *se_cmd)
1473 {
1474 return;
1475 }
1476
1477 static const char *usbg_check_wwn(const char *name)
1478 {
1479 const char *n;
1480 unsigned int len;
1481
1482 n = strstr(name, "naa.");
1483 if (!n)
1484 return NULL;
1485 n += 4;
1486 len = strlen(n);
1487 if (len == 0 || len > USBG_NAMELEN - 1)
1488 return NULL;
1489 return n;
1490 }
1491
1492 static struct se_node_acl *usbg_make_nodeacl(
1493 struct se_portal_group *se_tpg,
1494 struct config_group *group,
1495 const char *name)
1496 {
1497 struct se_node_acl *se_nacl, *se_nacl_new;
1498 struct usbg_nacl *nacl;
1499 u64 wwpn = 0;
1500 u32 nexus_depth;
1501 const char *wnn_name;
1502
1503 wnn_name = usbg_check_wwn(name);
1504 if (!wnn_name)
1505 return ERR_PTR(-EINVAL);
1506 se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1507 if (!(se_nacl_new))
1508 return ERR_PTR(-ENOMEM);
1509
1510 nexus_depth = 1;
1511 /*
1512 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1513 * when converting a NodeACL from demo mode -> explict
1514 */
1515 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1516 name, nexus_depth);
1517 if (IS_ERR(se_nacl)) {
1518 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1519 return se_nacl;
1520 }
1521 /*
1522 * Locate our struct usbg_nacl and set the FC Nport WWPN
1523 */
1524 nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1525 nacl->iport_wwpn = wwpn;
1526 snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1527 return se_nacl;
1528 }
1529
1530 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1531 {
1532 struct usbg_nacl *nacl = container_of(se_acl,
1533 struct usbg_nacl, se_node_acl);
1534 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1535 kfree(nacl);
1536 }
1537
1538 struct usbg_tpg *the_only_tpg_I_currently_have;
1539
1540 static struct se_portal_group *usbg_make_tpg(
1541 struct se_wwn *wwn,
1542 struct config_group *group,
1543 const char *name)
1544 {
1545 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1546 tport_wwn);
1547 struct usbg_tpg *tpg;
1548 unsigned long tpgt;
1549 int ret;
1550
1551 if (strstr(name, "tpgt_") != name)
1552 return ERR_PTR(-EINVAL);
1553 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1554 return ERR_PTR(-EINVAL);
1555 if (the_only_tpg_I_currently_have) {
1556 pr_err("Until the gadget framework can't handle multiple\n");
1557 pr_err("gadgets, you can't do this here.\n");
1558 return ERR_PTR(-EBUSY);
1559 }
1560
1561 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1562 if (!tpg)
1563 return ERR_PTR(-ENOMEM);
1564 mutex_init(&tpg->tpg_mutex);
1565 atomic_set(&tpg->tpg_port_count, 0);
1566 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1567 if (!tpg->workqueue) {
1568 kfree(tpg);
1569 return NULL;
1570 }
1571
1572 tpg->tport = tport;
1573 tpg->tport_tpgt = tpgt;
1574
1575 ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1576 &tpg->se_tpg, tpg,
1577 TRANSPORT_TPG_TYPE_NORMAL);
1578 if (ret < 0) {
1579 destroy_workqueue(tpg->workqueue);
1580 kfree(tpg);
1581 return NULL;
1582 }
1583 the_only_tpg_I_currently_have = tpg;
1584 return &tpg->se_tpg;
1585 }
1586
1587 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1588 {
1589 struct usbg_tpg *tpg = container_of(se_tpg,
1590 struct usbg_tpg, se_tpg);
1591
1592 core_tpg_deregister(se_tpg);
1593 destroy_workqueue(tpg->workqueue);
1594 kfree(tpg);
1595 the_only_tpg_I_currently_have = NULL;
1596 }
1597
1598 static struct se_wwn *usbg_make_tport(
1599 struct target_fabric_configfs *tf,
1600 struct config_group *group,
1601 const char *name)
1602 {
1603 struct usbg_tport *tport;
1604 const char *wnn_name;
1605 u64 wwpn = 0;
1606
1607 wnn_name = usbg_check_wwn(name);
1608 if (!wnn_name)
1609 return ERR_PTR(-EINVAL);
1610
1611 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1612 if (!(tport))
1613 return ERR_PTR(-ENOMEM);
1614 tport->tport_wwpn = wwpn;
1615 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1616 return &tport->tport_wwn;
1617 }
1618
1619 static void usbg_drop_tport(struct se_wwn *wwn)
1620 {
1621 struct usbg_tport *tport = container_of(wwn,
1622 struct usbg_tport, tport_wwn);
1623 kfree(tport);
1624 }
1625
1626 /*
1627 * If somebody feels like dropping the version property, go ahead.
1628 */
1629 static ssize_t usbg_wwn_show_attr_version(
1630 struct target_fabric_configfs *tf,
1631 char *page)
1632 {
1633 return sprintf(page, "usb-gadget fabric module\n");
1634 }
1635 TF_WWN_ATTR_RO(usbg, version);
1636
1637 static struct configfs_attribute *usbg_wwn_attrs[] = {
1638 &usbg_wwn_version.attr,
1639 NULL,
1640 };
1641
1642 static ssize_t tcm_usbg_tpg_show_enable(
1643 struct se_portal_group *se_tpg,
1644 char *page)
1645 {
1646 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1647
1648 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1649 }
1650
1651 static int usbg_attach(struct usbg_tpg *);
1652 static void usbg_detach(struct usbg_tpg *);
1653
1654 static ssize_t tcm_usbg_tpg_store_enable(
1655 struct se_portal_group *se_tpg,
1656 const char *page,
1657 size_t count)
1658 {
1659 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1660 unsigned long op;
1661 ssize_t ret;
1662
1663 ret = kstrtoul(page, 0, &op);
1664 if (ret < 0)
1665 return -EINVAL;
1666 if (op > 1)
1667 return -EINVAL;
1668
1669 if (op && tpg->gadget_connect)
1670 goto out;
1671 if (!op && !tpg->gadget_connect)
1672 goto out;
1673
1674 if (op) {
1675 ret = usbg_attach(tpg);
1676 if (ret)
1677 goto out;
1678 } else {
1679 usbg_detach(tpg);
1680 }
1681 tpg->gadget_connect = op;
1682 out:
1683 return count;
1684 }
1685 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1686
1687 static ssize_t tcm_usbg_tpg_show_nexus(
1688 struct se_portal_group *se_tpg,
1689 char *page)
1690 {
1691 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1692 struct tcm_usbg_nexus *tv_nexus;
1693 ssize_t ret;
1694
1695 mutex_lock(&tpg->tpg_mutex);
1696 tv_nexus = tpg->tpg_nexus;
1697 if (!tv_nexus) {
1698 ret = -ENODEV;
1699 goto out;
1700 }
1701 ret = snprintf(page, PAGE_SIZE, "%s\n",
1702 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1703 out:
1704 mutex_unlock(&tpg->tpg_mutex);
1705 return ret;
1706 }
1707
1708 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1709 {
1710 struct se_portal_group *se_tpg;
1711 struct tcm_usbg_nexus *tv_nexus;
1712 int ret;
1713
1714 mutex_lock(&tpg->tpg_mutex);
1715 if (tpg->tpg_nexus) {
1716 ret = -EEXIST;
1717 pr_debug("tpg->tpg_nexus already exists\n");
1718 goto err_unlock;
1719 }
1720 se_tpg = &tpg->se_tpg;
1721
1722 ret = -ENOMEM;
1723 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1724 if (!tv_nexus)
1725 goto err_unlock;
1726 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1727 if (IS_ERR(tv_nexus->tvn_se_sess))
1728 goto err_free;
1729
1730 /*
1731 * Since we are running in 'demo mode' this call with generate a
1732 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1733 * the SCSI Initiator port name of the passed configfs group 'name'.
1734 */
1735 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1736 se_tpg, name);
1737 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1738 pr_debug("core_tpg_check_initiator_node_acl() failed"
1739 " for %s\n", name);
1740 goto err_session;
1741 }
1742 /*
1743 * Now register the TCM vHost virtual I_T Nexus as active.
1744 */
1745 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1746 tv_nexus->tvn_se_sess, tv_nexus);
1747 tpg->tpg_nexus = tv_nexus;
1748 mutex_unlock(&tpg->tpg_mutex);
1749 return 0;
1750
1751 err_session:
1752 transport_free_session(tv_nexus->tvn_se_sess);
1753 err_free:
1754 kfree(tv_nexus);
1755 err_unlock:
1756 mutex_unlock(&tpg->tpg_mutex);
1757 return ret;
1758 }
1759
1760 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1761 {
1762 struct se_session *se_sess;
1763 struct tcm_usbg_nexus *tv_nexus;
1764 int ret = -ENODEV;
1765
1766 mutex_lock(&tpg->tpg_mutex);
1767 tv_nexus = tpg->tpg_nexus;
1768 if (!tv_nexus)
1769 goto out;
1770
1771 se_sess = tv_nexus->tvn_se_sess;
1772 if (!se_sess)
1773 goto out;
1774
1775 if (atomic_read(&tpg->tpg_port_count)) {
1776 ret = -EPERM;
1777 pr_err("Unable to remove Host I_T Nexus with"
1778 " active TPG port count: %d\n",
1779 atomic_read(&tpg->tpg_port_count));
1780 goto out;
1781 }
1782
1783 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1784 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1785 /*
1786 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1787 */
1788 transport_deregister_session(tv_nexus->tvn_se_sess);
1789 tpg->tpg_nexus = NULL;
1790
1791 kfree(tv_nexus);
1792 ret = 0;
1793 out:
1794 mutex_unlock(&tpg->tpg_mutex);
1795 return ret;
1796 }
1797
1798 static ssize_t tcm_usbg_tpg_store_nexus(
1799 struct se_portal_group *se_tpg,
1800 const char *page,
1801 size_t count)
1802 {
1803 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1804 unsigned char i_port[USBG_NAMELEN], *ptr;
1805 int ret;
1806
1807 if (!strncmp(page, "NULL", 4)) {
1808 ret = tcm_usbg_drop_nexus(tpg);
1809 return (!ret) ? count : ret;
1810 }
1811 if (strlen(page) >= USBG_NAMELEN) {
1812 pr_err("Emulated NAA Sas Address: %s, exceeds"
1813 " max: %d\n", page, USBG_NAMELEN);
1814 return -EINVAL;
1815 }
1816 snprintf(i_port, USBG_NAMELEN, "%s", page);
1817
1818 ptr = strstr(i_port, "naa.");
1819 if (!ptr) {
1820 pr_err("Missing 'naa.' prefix\n");
1821 return -EINVAL;
1822 }
1823
1824 if (i_port[strlen(i_port) - 1] == '\n')
1825 i_port[strlen(i_port) - 1] = '\0';
1826
1827 ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1828 if (ret < 0)
1829 return ret;
1830 return count;
1831 }
1832 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1833
1834 static struct configfs_attribute *usbg_base_attrs[] = {
1835 &tcm_usbg_tpg_enable.attr,
1836 &tcm_usbg_tpg_nexus.attr,
1837 NULL,
1838 };
1839
1840 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1841 {
1842 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1843
1844 atomic_inc(&tpg->tpg_port_count);
1845 smp_mb__after_atomic();
1846 return 0;
1847 }
1848
1849 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1850 struct se_lun *se_lun)
1851 {
1852 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1853
1854 atomic_dec(&tpg->tpg_port_count);
1855 smp_mb__after_atomic();
1856 }
1857
1858 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1859 {
1860 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1861 se_cmd);
1862
1863 kref_put(&cmd->ref, usbg_cmd_release);
1864 return 1;
1865 }
1866
1867 static struct target_core_fabric_ops usbg_ops = {
1868 .get_fabric_name = usbg_get_fabric_name,
1869 .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
1870 .tpg_get_wwn = usbg_get_fabric_wwn,
1871 .tpg_get_tag = usbg_get_tag,
1872 .tpg_get_default_depth = usbg_get_default_depth,
1873 .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
1874 .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
1875 .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
1876 .tpg_check_demo_mode = usbg_check_true,
1877 .tpg_check_demo_mode_cache = usbg_check_false,
1878 .tpg_check_demo_mode_write_protect = usbg_check_false,
1879 .tpg_check_prod_mode_write_protect = usbg_check_false,
1880 .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
1881 .tpg_release_fabric_acl = usbg_release_fabric_acl,
1882 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1883 .release_cmd = usbg_release_cmd,
1884 .shutdown_session = usbg_shutdown_session,
1885 .close_session = usbg_close_session,
1886 .sess_get_index = usbg_sess_get_index,
1887 .sess_get_initiator_sid = NULL,
1888 .write_pending = usbg_send_write_request,
1889 .write_pending_status = usbg_write_pending_status,
1890 .set_default_node_attributes = usbg_set_default_node_attrs,
1891 .get_task_tag = usbg_get_task_tag,
1892 .get_cmd_state = usbg_get_cmd_state,
1893 .queue_data_in = usbg_send_read_response,
1894 .queue_status = usbg_send_status_response,
1895 .queue_tm_rsp = usbg_queue_tm_rsp,
1896 .aborted_task = usbg_aborted_task,
1897 .check_stop_free = usbg_check_stop_free,
1898
1899 .fabric_make_wwn = usbg_make_tport,
1900 .fabric_drop_wwn = usbg_drop_tport,
1901 .fabric_make_tpg = usbg_make_tpg,
1902 .fabric_drop_tpg = usbg_drop_tpg,
1903 .fabric_post_link = usbg_port_link,
1904 .fabric_pre_unlink = usbg_port_unlink,
1905 .fabric_make_np = NULL,
1906 .fabric_drop_np = NULL,
1907 .fabric_make_nodeacl = usbg_make_nodeacl,
1908 .fabric_drop_nodeacl = usbg_drop_nodeacl,
1909 };
1910
1911 static int usbg_register_configfs(void)
1912 {
1913 struct target_fabric_configfs *fabric;
1914 int ret;
1915
1916 fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1917 if (IS_ERR(fabric)) {
1918 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1919 return PTR_ERR(fabric);
1920 }
1921
1922 fabric->tf_ops = usbg_ops;
1923 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1924 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1925 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1926 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1927 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1928 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1929 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1930 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1931 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1932 ret = target_fabric_configfs_register(fabric);
1933 if (ret < 0) {
1934 printk(KERN_ERR "target_fabric_configfs_register() failed"
1935 " for usb-gadget\n");
1936 return ret;
1937 }
1938 usbg_fabric_configfs = fabric;
1939 return 0;
1940 };
1941
1942 static void usbg_deregister_configfs(void)
1943 {
1944 if (!(usbg_fabric_configfs))
1945 return;
1946
1947 target_fabric_configfs_deregister(usbg_fabric_configfs);
1948 usbg_fabric_configfs = NULL;
1949 };
1950
1951 /* Start gadget.c code */
1952
1953 static struct usb_interface_descriptor bot_intf_desc = {
1954 .bLength = sizeof(bot_intf_desc),
1955 .bDescriptorType = USB_DT_INTERFACE,
1956 .bNumEndpoints = 2,
1957 .bAlternateSetting = USB_G_ALT_INT_BBB,
1958 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1959 .bInterfaceSubClass = USB_SC_SCSI,
1960 .bInterfaceProtocol = USB_PR_BULK,
1961 };
1962
1963 static struct usb_interface_descriptor uasp_intf_desc = {
1964 .bLength = sizeof(uasp_intf_desc),
1965 .bDescriptorType = USB_DT_INTERFACE,
1966 .bNumEndpoints = 4,
1967 .bAlternateSetting = USB_G_ALT_INT_UAS,
1968 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1969 .bInterfaceSubClass = USB_SC_SCSI,
1970 .bInterfaceProtocol = USB_PR_UAS,
1971 };
1972
1973 static struct usb_endpoint_descriptor uasp_bi_desc = {
1974 .bLength = USB_DT_ENDPOINT_SIZE,
1975 .bDescriptorType = USB_DT_ENDPOINT,
1976 .bEndpointAddress = USB_DIR_IN,
1977 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1978 .wMaxPacketSize = cpu_to_le16(512),
1979 };
1980
1981 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1982 .bLength = USB_DT_ENDPOINT_SIZE,
1983 .bDescriptorType = USB_DT_ENDPOINT,
1984 .bEndpointAddress = USB_DIR_IN,
1985 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1986 };
1987
1988 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1989 .bLength = sizeof(uasp_bi_pipe_desc),
1990 .bDescriptorType = USB_DT_PIPE_USAGE,
1991 .bPipeID = DATA_IN_PIPE_ID,
1992 };
1993
1994 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1995 .bLength = USB_DT_ENDPOINT_SIZE,
1996 .bDescriptorType = USB_DT_ENDPOINT,
1997 .bEndpointAddress = USB_DIR_IN,
1998 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1999 .wMaxPacketSize = cpu_to_le16(1024),
2000 };
2001
2002 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2003 .bLength = sizeof(uasp_bi_ep_comp_desc),
2004 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2005 .bMaxBurst = 0,
2006 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2007 .wBytesPerInterval = 0,
2008 };
2009
2010 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2011 .bLength = sizeof(bot_bi_ep_comp_desc),
2012 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2013 .bMaxBurst = 0,
2014 };
2015
2016 static struct usb_endpoint_descriptor uasp_bo_desc = {
2017 .bLength = USB_DT_ENDPOINT_SIZE,
2018 .bDescriptorType = USB_DT_ENDPOINT,
2019 .bEndpointAddress = USB_DIR_OUT,
2020 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2021 .wMaxPacketSize = cpu_to_le16(512),
2022 };
2023
2024 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2025 .bLength = USB_DT_ENDPOINT_SIZE,
2026 .bDescriptorType = USB_DT_ENDPOINT,
2027 .bEndpointAddress = USB_DIR_OUT,
2028 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2029 };
2030
2031 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2032 .bLength = sizeof(uasp_bo_pipe_desc),
2033 .bDescriptorType = USB_DT_PIPE_USAGE,
2034 .bPipeID = DATA_OUT_PIPE_ID,
2035 };
2036
2037 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2038 .bLength = USB_DT_ENDPOINT_SIZE,
2039 .bDescriptorType = USB_DT_ENDPOINT,
2040 .bEndpointAddress = USB_DIR_OUT,
2041 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2042 .wMaxPacketSize = cpu_to_le16(0x400),
2043 };
2044
2045 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2046 .bLength = sizeof(uasp_bo_ep_comp_desc),
2047 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2048 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2049 };
2050
2051 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2052 .bLength = sizeof(bot_bo_ep_comp_desc),
2053 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2054 };
2055
2056 static struct usb_endpoint_descriptor uasp_status_desc = {
2057 .bLength = USB_DT_ENDPOINT_SIZE,
2058 .bDescriptorType = USB_DT_ENDPOINT,
2059 .bEndpointAddress = USB_DIR_IN,
2060 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2061 .wMaxPacketSize = cpu_to_le16(512),
2062 };
2063
2064 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2065 .bLength = USB_DT_ENDPOINT_SIZE,
2066 .bDescriptorType = USB_DT_ENDPOINT,
2067 .bEndpointAddress = USB_DIR_IN,
2068 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2069 };
2070
2071 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2072 .bLength = sizeof(uasp_status_pipe_desc),
2073 .bDescriptorType = USB_DT_PIPE_USAGE,
2074 .bPipeID = STATUS_PIPE_ID,
2075 };
2076
2077 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2078 .bLength = USB_DT_ENDPOINT_SIZE,
2079 .bDescriptorType = USB_DT_ENDPOINT,
2080 .bEndpointAddress = USB_DIR_IN,
2081 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2082 .wMaxPacketSize = cpu_to_le16(1024),
2083 };
2084
2085 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2086 .bLength = sizeof(uasp_status_in_ep_comp_desc),
2087 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2088 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2089 };
2090
2091 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2092 .bLength = USB_DT_ENDPOINT_SIZE,
2093 .bDescriptorType = USB_DT_ENDPOINT,
2094 .bEndpointAddress = USB_DIR_OUT,
2095 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2096 .wMaxPacketSize = cpu_to_le16(512),
2097 };
2098
2099 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2100 .bLength = USB_DT_ENDPOINT_SIZE,
2101 .bDescriptorType = USB_DT_ENDPOINT,
2102 .bEndpointAddress = USB_DIR_OUT,
2103 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2104 };
2105
2106 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2107 .bLength = sizeof(uasp_cmd_pipe_desc),
2108 .bDescriptorType = USB_DT_PIPE_USAGE,
2109 .bPipeID = CMD_PIPE_ID,
2110 };
2111
2112 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2113 .bLength = USB_DT_ENDPOINT_SIZE,
2114 .bDescriptorType = USB_DT_ENDPOINT,
2115 .bEndpointAddress = USB_DIR_OUT,
2116 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2117 .wMaxPacketSize = cpu_to_le16(1024),
2118 };
2119
2120 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2121 .bLength = sizeof(uasp_cmd_comp_desc),
2122 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2123 };
2124
2125 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2126 (struct usb_descriptor_header *) &bot_intf_desc,
2127 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2128 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2129
2130 (struct usb_descriptor_header *) &uasp_intf_desc,
2131 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2132 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2133 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2134 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2135 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2136 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2137 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2138 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2139 NULL,
2140 };
2141
2142 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2143 (struct usb_descriptor_header *) &bot_intf_desc,
2144 (struct usb_descriptor_header *) &uasp_bi_desc,
2145 (struct usb_descriptor_header *) &uasp_bo_desc,
2146
2147 (struct usb_descriptor_header *) &uasp_intf_desc,
2148 (struct usb_descriptor_header *) &uasp_bi_desc,
2149 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2150 (struct usb_descriptor_header *) &uasp_bo_desc,
2151 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2152 (struct usb_descriptor_header *) &uasp_status_desc,
2153 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2154 (struct usb_descriptor_header *) &uasp_cmd_desc,
2155 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2156 NULL,
2157 };
2158
2159 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2160 (struct usb_descriptor_header *) &bot_intf_desc,
2161 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2162 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2163 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2164 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2165
2166 (struct usb_descriptor_header *) &uasp_intf_desc,
2167 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2168 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2169 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2170 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2171 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2172 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2173 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2174 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2175 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2176 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2177 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2178 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2179 NULL,
2180 };
2181
2182 #define UAS_VENDOR_ID 0x0525 /* NetChip */
2183 #define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
2184
2185 static struct usb_device_descriptor usbg_device_desc = {
2186 .bLength = sizeof(usbg_device_desc),
2187 .bDescriptorType = USB_DT_DEVICE,
2188 .bcdUSB = cpu_to_le16(0x0200),
2189 .bDeviceClass = USB_CLASS_PER_INTERFACE,
2190 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
2191 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
2192 .bNumConfigurations = 1,
2193 };
2194
2195 static struct usb_string usbg_us_strings[] = {
2196 [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2197 [USB_GADGET_PRODUCT_IDX].s = "Target Product",
2198 [USB_GADGET_SERIAL_IDX].s = "000000000001",
2199 [USB_G_STR_CONFIG].s = "default config",
2200 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
2201 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
2202 { },
2203 };
2204
2205 static struct usb_gadget_strings usbg_stringtab = {
2206 .language = 0x0409,
2207 .strings = usbg_us_strings,
2208 };
2209
2210 static struct usb_gadget_strings *usbg_strings[] = {
2211 &usbg_stringtab,
2212 NULL,
2213 };
2214
2215 static int guas_unbind(struct usb_composite_dev *cdev)
2216 {
2217 return 0;
2218 }
2219
2220 static struct usb_configuration usbg_config_driver = {
2221 .label = "Linux Target",
2222 .bConfigurationValue = 1,
2223 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2224 };
2225
2226 static void give_back_ep(struct usb_ep **pep)
2227 {
2228 struct usb_ep *ep = *pep;
2229 if (!ep)
2230 return;
2231 ep->driver_data = NULL;
2232 }
2233
2234 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2235 {
2236 struct f_uas *fu = to_f_uas(f);
2237 struct usb_gadget *gadget = c->cdev->gadget;
2238 struct usb_ep *ep;
2239 int iface;
2240 int ret;
2241
2242 iface = usb_interface_id(c, f);
2243 if (iface < 0)
2244 return iface;
2245
2246 bot_intf_desc.bInterfaceNumber = iface;
2247 uasp_intf_desc.bInterfaceNumber = iface;
2248 fu->iface = iface;
2249 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2250 &uasp_bi_ep_comp_desc);
2251 if (!ep)
2252 goto ep_fail;
2253
2254 ep->driver_data = fu;
2255 fu->ep_in = ep;
2256
2257 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2258 &uasp_bo_ep_comp_desc);
2259 if (!ep)
2260 goto ep_fail;
2261 ep->driver_data = fu;
2262 fu->ep_out = ep;
2263
2264 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2265 &uasp_status_in_ep_comp_desc);
2266 if (!ep)
2267 goto ep_fail;
2268 ep->driver_data = fu;
2269 fu->ep_status = ep;
2270
2271 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2272 &uasp_cmd_comp_desc);
2273 if (!ep)
2274 goto ep_fail;
2275 ep->driver_data = fu;
2276 fu->ep_cmd = ep;
2277
2278 /* Assume endpoint addresses are the same for both speeds */
2279 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2280 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2281 uasp_status_desc.bEndpointAddress =
2282 uasp_ss_status_desc.bEndpointAddress;
2283 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2284
2285 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2286 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2287 uasp_fs_status_desc.bEndpointAddress =
2288 uasp_ss_status_desc.bEndpointAddress;
2289 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2290
2291 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2292 uasp_hs_function_desc, uasp_ss_function_desc);
2293 if (ret)
2294 goto ep_fail;
2295
2296 return 0;
2297 ep_fail:
2298 pr_err("Can't claim all required eps\n");
2299
2300 give_back_ep(&fu->ep_in);
2301 give_back_ep(&fu->ep_out);
2302 give_back_ep(&fu->ep_status);
2303 give_back_ep(&fu->ep_cmd);
2304 return -ENOTSUPP;
2305 }
2306
2307 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2308 {
2309 struct f_uas *fu = to_f_uas(f);
2310
2311 usb_free_all_descriptors(f);
2312 kfree(fu);
2313 }
2314
2315 struct guas_setup_wq {
2316 struct work_struct work;
2317 struct f_uas *fu;
2318 unsigned int alt;
2319 };
2320
2321 static void usbg_delayed_set_alt(struct work_struct *wq)
2322 {
2323 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2324 work);
2325 struct f_uas *fu = work->fu;
2326 int alt = work->alt;
2327
2328 kfree(work);
2329
2330 if (fu->flags & USBG_IS_BOT)
2331 bot_cleanup_old_alt(fu);
2332 if (fu->flags & USBG_IS_UAS)
2333 uasp_cleanup_old_alt(fu);
2334
2335 if (alt == USB_G_ALT_INT_BBB)
2336 bot_set_alt(fu);
2337 else if (alt == USB_G_ALT_INT_UAS)
2338 uasp_set_alt(fu);
2339 usb_composite_setup_continue(fu->function.config->cdev);
2340 }
2341
2342 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2343 {
2344 struct f_uas *fu = to_f_uas(f);
2345
2346 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2347 struct guas_setup_wq *work;
2348
2349 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2350 if (!work)
2351 return -ENOMEM;
2352 INIT_WORK(&work->work, usbg_delayed_set_alt);
2353 work->fu = fu;
2354 work->alt = alt;
2355 schedule_work(&work->work);
2356 return USB_GADGET_DELAYED_STATUS;
2357 }
2358 return -EOPNOTSUPP;
2359 }
2360
2361 static void usbg_disable(struct usb_function *f)
2362 {
2363 struct f_uas *fu = to_f_uas(f);
2364
2365 if (fu->flags & USBG_IS_UAS)
2366 uasp_cleanup_old_alt(fu);
2367 else if (fu->flags & USBG_IS_BOT)
2368 bot_cleanup_old_alt(fu);
2369 fu->flags = 0;
2370 }
2371
2372 static int usbg_setup(struct usb_function *f,
2373 const struct usb_ctrlrequest *ctrl)
2374 {
2375 struct f_uas *fu = to_f_uas(f);
2376
2377 if (!(fu->flags & USBG_IS_BOT))
2378 return -EOPNOTSUPP;
2379
2380 return usbg_bot_setup(f, ctrl);
2381 }
2382
2383 static int usbg_cfg_bind(struct usb_configuration *c)
2384 {
2385 struct f_uas *fu;
2386 int ret;
2387
2388 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2389 if (!fu)
2390 return -ENOMEM;
2391 fu->function.name = "Target Function";
2392 fu->function.bind = usbg_bind;
2393 fu->function.unbind = usbg_unbind;
2394 fu->function.set_alt = usbg_set_alt;
2395 fu->function.setup = usbg_setup;
2396 fu->function.disable = usbg_disable;
2397 fu->tpg = the_only_tpg_I_currently_have;
2398
2399 bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2400 uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2401
2402 ret = usb_add_function(c, &fu->function);
2403 if (ret)
2404 goto err;
2405
2406 return 0;
2407 err:
2408 kfree(fu);
2409 return ret;
2410 }
2411
2412 static int usb_target_bind(struct usb_composite_dev *cdev)
2413 {
2414 int ret;
2415
2416 ret = usb_string_ids_tab(cdev, usbg_us_strings);
2417 if (ret)
2418 return ret;
2419
2420 usbg_device_desc.iManufacturer =
2421 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2422 usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2423 usbg_device_desc.iSerialNumber =
2424 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2425 usbg_config_driver.iConfiguration =
2426 usbg_us_strings[USB_G_STR_CONFIG].id;
2427
2428 ret = usb_add_config(cdev, &usbg_config_driver,
2429 usbg_cfg_bind);
2430 if (ret)
2431 return ret;
2432 usb_composite_overwrite_options(cdev, &coverwrite);
2433 return 0;
2434 }
2435
2436 static __refdata struct usb_composite_driver usbg_driver = {
2437 .name = "g_target",
2438 .dev = &usbg_device_desc,
2439 .strings = usbg_strings,
2440 .max_speed = USB_SPEED_SUPER,
2441 .bind = usb_target_bind,
2442 .unbind = guas_unbind,
2443 };
2444
2445 static int usbg_attach(struct usbg_tpg *tpg)
2446 {
2447 return usb_composite_probe(&usbg_driver);
2448 }
2449
2450 static void usbg_detach(struct usbg_tpg *tpg)
2451 {
2452 usb_composite_unregister(&usbg_driver);
2453 }
2454
2455 static int __init usb_target_gadget_init(void)
2456 {
2457 int ret;
2458
2459 ret = usbg_register_configfs();
2460 return ret;
2461 }
2462 module_init(usb_target_gadget_init);
2463
2464 static void __exit usb_target_gadget_exit(void)
2465 {
2466 usbg_deregister_configfs();
2467 }
2468 module_exit(usb_target_gadget_exit);
2469
2470 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2471 MODULE_DESCRIPTION("usb-gadget fabric");
2472 MODULE_LICENSE("GPL v2");
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