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usb: gadget: tcm: factor out f_tcm
[deliverable/linux.git] / drivers / usb / gadget / function / f_tcm.c
CommitLineData
08a1cb0f
AP		 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.h"
25
26static inline struct f_uas *to_f_uas(struct usb_function *f)
27{
28 return container_of(f, struct f_uas, function);
29}
30
31static void usbg_cmd_release(struct kref *);
32
33static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
34{
35 kref_put(&cmd->ref, usbg_cmd_release);
36}
37
38/* Start bot.c code */
39
40static int bot_enqueue_cmd_cbw(struct f_uas *fu)
41{
42 int ret;
43
44 if (fu->flags & USBG_BOT_CMD_PEND)
45 return 0;
46
47 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
48 if (!ret)
49 fu->flags |= USBG_BOT_CMD_PEND;
50 return ret;
51}
52
53static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
54{
55 struct usbg_cmd *cmd = req->context;
56 struct f_uas *fu = cmd->fu;
57
58 usbg_cleanup_cmd(cmd);
59 if (req->status < 0) {
60 pr_err("ERR %s(%d)\n", __func__, __LINE__);
61 return;
62 }
63
64 /* CSW completed, wait for next CBW */
65 bot_enqueue_cmd_cbw(fu);
66}
67
68static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
69{
70 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
71 int ret;
72 u8 *sense;
73 unsigned int csw_stat;
74
75 csw_stat = cmd->csw_code;
76
77 /*
78 * We can't send SENSE as a response. So we take ASC & ASCQ from our
79 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
80 * command where it learns why we failed.
81 */
82 sense = cmd->sense_iu.sense;
83
84 csw->Tag = cmd->bot_tag;
85 csw->Status = csw_stat;
86 fu->bot_status.req->context = cmd;
87 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
88 if (ret)
89 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
90}
91
92static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
93{
94 struct usbg_cmd *cmd = req->context;
95 struct f_uas *fu = cmd->fu;
96
97 if (req->status < 0)
98 pr_err("ERR %s(%d)\n", __func__, __LINE__);
99
100 if (cmd->data_len) {
101 if (cmd->data_len > ep->maxpacket) {
102 req->length = ep->maxpacket;
103 cmd->data_len -= ep->maxpacket;
104 } else {
105 req->length = cmd->data_len;
106 cmd->data_len = 0;
107 }
108
109 usb_ep_queue(ep, req, GFP_ATOMIC);
110 return;
111 }
112 bot_enqueue_sense_code(fu, cmd);
113}
114
115static void bot_send_bad_status(struct usbg_cmd *cmd)
116{
117 struct f_uas *fu = cmd->fu;
118 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
119 struct usb_request *req;
120 struct usb_ep *ep;
121
122 csw->Residue = cpu_to_le32(cmd->data_len);
123
124 if (cmd->data_len) {
125 if (cmd->is_read) {
126 ep = fu->ep_in;
127 req = fu->bot_req_in;
128 } else {
129 ep = fu->ep_out;
130 req = fu->bot_req_out;
131 }
132
133 if (cmd->data_len > fu->ep_in->maxpacket) {
134 req->length = ep->maxpacket;
135 cmd->data_len -= ep->maxpacket;
136 } else {
137 req->length = cmd->data_len;
138 cmd->data_len = 0;
139 }
140 req->complete = bot_err_compl;
141 req->context = cmd;
142 req->buf = fu->cmd.buf;
143 usb_ep_queue(ep, req, GFP_KERNEL);
144 } else {
145 bot_enqueue_sense_code(fu, cmd);
146 }
147}
148
149static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
150{
151 struct f_uas *fu = cmd->fu;
152 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
153 int ret;
154
155 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
156 if (!moved_data && cmd->data_len) {
157 /*
158 * the host wants to move data, we don't. Fill / empty
159 * the pipe and then send the csw with reside set.
160 */
161 cmd->csw_code = US_BULK_STAT_OK;
162 bot_send_bad_status(cmd);
163 return 0;
164 }
165
166 csw->Tag = cmd->bot_tag;
167 csw->Residue = cpu_to_le32(0);
168 csw->Status = US_BULK_STAT_OK;
169 fu->bot_status.req->context = cmd;
170
171 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
172 if (ret)
173 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
174 } else {
175 cmd->csw_code = US_BULK_STAT_FAIL;
176 bot_send_bad_status(cmd);
177 }
178 return 0;
179}
180
181/*
182 * Called after command (no data transfer) or after the write (to device)
183 * operation is completed
184 */
185static int bot_send_status_response(struct usbg_cmd *cmd)
186{
187 bool moved_data = false;
188
189 if (!cmd->is_read)
190 moved_data = true;
191 return bot_send_status(cmd, moved_data);
192}
193
194/* Read request completed, now we have to send the CSW */
195static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
196{
197 struct usbg_cmd *cmd = req->context;
198
199 if (req->status < 0)
200 pr_err("ERR %s(%d)\n", __func__, __LINE__);
201
202 bot_send_status(cmd, true);
203}
204
205static int bot_send_read_response(struct usbg_cmd *cmd)
206{
207 struct f_uas *fu = cmd->fu;
208 struct se_cmd *se_cmd = &cmd->se_cmd;
209 struct usb_gadget *gadget = fuas_to_gadget(fu);
210 int ret;
211
212 if (!cmd->data_len) {
213 cmd->csw_code = US_BULK_STAT_PHASE;
214 bot_send_bad_status(cmd);
215 return 0;
216 }
217
218 if (!gadget->sg_supported) {
219 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
220 if (!cmd->data_buf)
221 return -ENOMEM;
222
223 sg_copy_to_buffer(se_cmd->t_data_sg,
224 se_cmd->t_data_nents,
225 cmd->data_buf,
226 se_cmd->data_length);
227
228 fu->bot_req_in->buf = cmd->data_buf;
229 } else {
230 fu->bot_req_in->buf = NULL;
231 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
232 fu->bot_req_in->sg = se_cmd->t_data_sg;
233 }
234
235 fu->bot_req_in->complete = bot_read_compl;
236 fu->bot_req_in->length = se_cmd->data_length;
237 fu->bot_req_in->context = cmd;
238 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
239 if (ret)
240 pr_err("%s(%d)\n", __func__, __LINE__);
241 return 0;
242}
243
244static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
245static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
246
247static int bot_send_write_request(struct usbg_cmd *cmd)
248{
249 struct f_uas *fu = cmd->fu;
250 struct se_cmd *se_cmd = &cmd->se_cmd;
251 struct usb_gadget *gadget = fuas_to_gadget(fu);
252 int ret;
253
254 init_completion(&cmd->write_complete);
255 cmd->fu = fu;
256
257 if (!cmd->data_len) {
258 cmd->csw_code = US_BULK_STAT_PHASE;
259 return -EINVAL;
260 }
261
262 if (!gadget->sg_supported) {
263 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
264 if (!cmd->data_buf)
265 return -ENOMEM;
266
267 fu->bot_req_out->buf = cmd->data_buf;
268 } else {
269 fu->bot_req_out->buf = NULL;
270 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
271 fu->bot_req_out->sg = se_cmd->t_data_sg;
272 }
273
274 fu->bot_req_out->complete = usbg_data_write_cmpl;
275 fu->bot_req_out->length = se_cmd->data_length;
276 fu->bot_req_out->context = cmd;
277
278 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
279 if (ret)
280 goto cleanup;
281 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
282 if (ret)
283 pr_err("%s(%d)\n", __func__, __LINE__);
284
285 wait_for_completion(&cmd->write_complete);
286 target_execute_cmd(se_cmd);
287cleanup:
288 return ret;
289}
290
291static int bot_submit_command(struct f_uas *, void *, unsigned int);
292
293static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
294{
295 struct f_uas *fu = req->context;
296 int ret;
297
298 fu->flags &= ~USBG_BOT_CMD_PEND;
299
300 if (req->status < 0)
301 return;
302
303 ret = bot_submit_command(fu, req->buf, req->actual);
304 if (ret)
305 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
306}
307
308static int bot_prepare_reqs(struct f_uas *fu)
309{
310 int ret;
311
312 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
313 if (!fu->bot_req_in)
314 goto err;
315
316 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
317 if (!fu->bot_req_out)
318 goto err_out;
319
320 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
321 if (!fu->cmd.req)
322 goto err_cmd;
323
324 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
325 if (!fu->bot_status.req)
326 goto err_sts;
327
328 fu->bot_status.req->buf = &fu->bot_status.csw;
329 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
330 fu->bot_status.req->complete = bot_status_complete;
331 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
332
333 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
334 if (!fu->cmd.buf)
335 goto err_buf;
336
337 fu->cmd.req->complete = bot_cmd_complete;
338 fu->cmd.req->buf = fu->cmd.buf;
339 fu->cmd.req->length = fu->ep_out->maxpacket;
340 fu->cmd.req->context = fu;
341
342 ret = bot_enqueue_cmd_cbw(fu);
343 if (ret)
344 goto err_queue;
345 return 0;
346err_queue:
347 kfree(fu->cmd.buf);
348 fu->cmd.buf = NULL;
349err_buf:
350 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
351err_sts:
352 usb_ep_free_request(fu->ep_out, fu->cmd.req);
353 fu->cmd.req = NULL;
354err_cmd:
355 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
356 fu->bot_req_out = NULL;
357err_out:
358 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
359 fu->bot_req_in = NULL;
360err:
361 pr_err("BOT: endpoint setup failed\n");
362 return -ENOMEM;
363}
364
365static void bot_cleanup_old_alt(struct f_uas *fu)
366{
367 if (!(fu->flags & USBG_ENABLED))
368 return;
369
370 usb_ep_disable(fu->ep_in);
371 usb_ep_disable(fu->ep_out);
372
373 if (!fu->bot_req_in)
374 return;
375
376 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
377 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
378 usb_ep_free_request(fu->ep_out, fu->cmd.req);
379 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
380
381 kfree(fu->cmd.buf);
382
383 fu->bot_req_in = NULL;
384 fu->bot_req_out = NULL;
385 fu->cmd.req = NULL;
386 fu->bot_status.req = NULL;
387 fu->cmd.buf = NULL;
388}
389
390static void bot_set_alt(struct f_uas *fu)
391{
392 struct usb_function *f = &fu->function;
393 struct usb_gadget *gadget = f->config->cdev->gadget;
394 int ret;
395
396 fu->flags = USBG_IS_BOT;
397
398 config_ep_by_speed(gadget, f, fu->ep_in);
399 ret = usb_ep_enable(fu->ep_in);
400 if (ret)
401 goto err_b_in;
402
403 config_ep_by_speed(gadget, f, fu->ep_out);
404 ret = usb_ep_enable(fu->ep_out);
405 if (ret)
406 goto err_b_out;
407
408 ret = bot_prepare_reqs(fu);
409 if (ret)
410 goto err_wq;
411 fu->flags |= USBG_ENABLED;
412 pr_info("Using the BOT protocol\n");
413 return;
414err_wq:
415 usb_ep_disable(fu->ep_out);
416err_b_out:
417 usb_ep_disable(fu->ep_in);
418err_b_in:
419 fu->flags = USBG_IS_BOT;
420}
421
422static int usbg_bot_setup(struct usb_function *f,
423 const struct usb_ctrlrequest *ctrl)
424{
425 struct f_uas *fu = to_f_uas(f);
426 struct usb_composite_dev *cdev = f->config->cdev;
427 u16 w_value = le16_to_cpu(ctrl->wValue);
428 u16 w_length = le16_to_cpu(ctrl->wLength);
429 int luns;
430 u8 *ret_lun;
431
432 switch (ctrl->bRequest) {
433 case US_BULK_GET_MAX_LUN:
434 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
435 USB_RECIP_INTERFACE))
436 return -ENOTSUPP;
437
438 if (w_length < 1)
439 return -EINVAL;
440 if (w_value != 0)
441 return -EINVAL;
442 luns = atomic_read(&fu->tpg->tpg_port_count);
443 if (!luns) {
444 pr_err("No LUNs configured?\n");
445 return -EINVAL;
446 }
447 /*
448 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
449 * accessed. The upper limit is 0xf
450 */
451 luns--;
452 if (luns > 0xf) {
453 pr_info_once("Limiting the number of luns to 16\n");
454 luns = 0xf;
455 }
456 ret_lun = cdev->req->buf;
457 *ret_lun = luns;
458 cdev->req->length = 1;
459 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
460
461 case US_BULK_RESET_REQUEST:
462 /* XXX maybe we should remove previous requests for IN + OUT */
463 bot_enqueue_cmd_cbw(fu);
464 return 0;
465 }
466 return -ENOTSUPP;
467}
468
469/* Start uas.c code */
470
471static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
472{
473 /* We have either all three allocated or none */
474 if (!stream->req_in)
475 return;
476
477 usb_ep_free_request(fu->ep_in, stream->req_in);
478 usb_ep_free_request(fu->ep_out, stream->req_out);
479 usb_ep_free_request(fu->ep_status, stream->req_status);
480
481 stream->req_in = NULL;
482 stream->req_out = NULL;
483 stream->req_status = NULL;
484}
485
486static void uasp_free_cmdreq(struct f_uas *fu)
487{
488 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
489 kfree(fu->cmd.buf);
490 fu->cmd.req = NULL;
491 fu->cmd.buf = NULL;
492}
493
494static void uasp_cleanup_old_alt(struct f_uas *fu)
495{
496 int i;
497
498 if (!(fu->flags & USBG_ENABLED))
499 return;
500
501 usb_ep_disable(fu->ep_in);
502 usb_ep_disable(fu->ep_out);
503 usb_ep_disable(fu->ep_status);
504 usb_ep_disable(fu->ep_cmd);
505
506 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
507 uasp_cleanup_one_stream(fu, &fu->stream[i]);
508 uasp_free_cmdreq(fu);
509}
510
511static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
512
513static int uasp_prepare_r_request(struct usbg_cmd *cmd)
514{
515 struct se_cmd *se_cmd = &cmd->se_cmd;
516 struct f_uas *fu = cmd->fu;
517 struct usb_gadget *gadget = fuas_to_gadget(fu);
518 struct uas_stream *stream = cmd->stream;
519
520 if (!gadget->sg_supported) {
521 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
522 if (!cmd->data_buf)
523 return -ENOMEM;
524
525 sg_copy_to_buffer(se_cmd->t_data_sg,
526 se_cmd->t_data_nents,
527 cmd->data_buf,
528 se_cmd->data_length);
529
530 stream->req_in->buf = cmd->data_buf;
531 } else {
532 stream->req_in->buf = NULL;
533 stream->req_in->num_sgs = se_cmd->t_data_nents;
534 stream->req_in->sg = se_cmd->t_data_sg;
535 }
536
537 stream->req_in->complete = uasp_status_data_cmpl;
538 stream->req_in->length = se_cmd->data_length;
539 stream->req_in->context = cmd;
540
541 cmd->state = UASP_SEND_STATUS;
542 return 0;
543}
544
545static void uasp_prepare_status(struct usbg_cmd *cmd)
546{
547 struct se_cmd *se_cmd = &cmd->se_cmd;
548 struct sense_iu *iu = &cmd->sense_iu;
549 struct uas_stream *stream = cmd->stream;
550
551 cmd->state = UASP_QUEUE_COMMAND;
552 iu->iu_id = IU_ID_STATUS;
553 iu->tag = cpu_to_be16(cmd->tag);
554
555 /*
556 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
557 */
558 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
559 iu->status = se_cmd->scsi_status;
560 stream->req_status->context = cmd;
561 stream->req_status->length = se_cmd->scsi_sense_length + 16;
562 stream->req_status->buf = iu;
563 stream->req_status->complete = uasp_status_data_cmpl;
564}
565
566static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
567{
568 struct usbg_cmd *cmd = req->context;
569 struct uas_stream *stream = cmd->stream;
570 struct f_uas *fu = cmd->fu;
571 int ret;
572
573 if (req->status < 0)
574 goto cleanup;
575
576 switch (cmd->state) {
577 case UASP_SEND_DATA:
578 ret = uasp_prepare_r_request(cmd);
579 if (ret)
580 goto cleanup;
581 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
582 if (ret)
583 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
584 break;
585
586 case UASP_RECEIVE_DATA:
587 ret = usbg_prepare_w_request(cmd, stream->req_out);
588 if (ret)
589 goto cleanup;
590 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
591 if (ret)
592 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
593 break;
594
595 case UASP_SEND_STATUS:
596 uasp_prepare_status(cmd);
597 ret = usb_ep_queue(fu->ep_status, stream->req_status,
598 GFP_ATOMIC);
599 if (ret)
600 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
601 break;
602
603 case UASP_QUEUE_COMMAND:
604 usbg_cleanup_cmd(cmd);
605 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
606 break;
607
608 default:
609 BUG();
610 }
611 return;
612
613cleanup:
614 usbg_cleanup_cmd(cmd);
615}
616
617static int uasp_send_status_response(struct usbg_cmd *cmd)
618{
619 struct f_uas *fu = cmd->fu;
620 struct uas_stream *stream = cmd->stream;
621 struct sense_iu *iu = &cmd->sense_iu;
622
623 iu->tag = cpu_to_be16(cmd->tag);
624 stream->req_status->complete = uasp_status_data_cmpl;
625 stream->req_status->context = cmd;
626 cmd->fu = fu;
627 uasp_prepare_status(cmd);
628 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
629}
630
631static int uasp_send_read_response(struct usbg_cmd *cmd)
632{
633 struct f_uas *fu = cmd->fu;
634 struct uas_stream *stream = cmd->stream;
635 struct sense_iu *iu = &cmd->sense_iu;
636 int ret;
637
638 cmd->fu = fu;
639
640 iu->tag = cpu_to_be16(cmd->tag);
641 if (fu->flags & USBG_USE_STREAMS) {
642
643 ret = uasp_prepare_r_request(cmd);
644 if (ret)
645 goto out;
646 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
647 if (ret) {
648 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
649 kfree(cmd->data_buf);
650 cmd->data_buf = NULL;
651 }
652
653 } else {
654
655 iu->iu_id = IU_ID_READ_READY;
656 iu->tag = cpu_to_be16(cmd->tag);
657
658 stream->req_status->complete = uasp_status_data_cmpl;
659 stream->req_status->context = cmd;
660
661 cmd->state = UASP_SEND_DATA;
662 stream->req_status->buf = iu;
663 stream->req_status->length = sizeof(struct iu);
664
665 ret = usb_ep_queue(fu->ep_status, stream->req_status,
666 GFP_ATOMIC);
667 if (ret)
668 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
669 }
670out:
671 return ret;
672}
673
674static int uasp_send_write_request(struct usbg_cmd *cmd)
675{
676 struct f_uas *fu = cmd->fu;
677 struct se_cmd *se_cmd = &cmd->se_cmd;
678 struct uas_stream *stream = cmd->stream;
679 struct sense_iu *iu = &cmd->sense_iu;
680 int ret;
681
682 init_completion(&cmd->write_complete);
683 cmd->fu = fu;
684
685 iu->tag = cpu_to_be16(cmd->tag);
686
687 if (fu->flags & USBG_USE_STREAMS) {
688
689 ret = usbg_prepare_w_request(cmd, stream->req_out);
690 if (ret)
691 goto cleanup;
692 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
693 if (ret)
694 pr_err("%s(%d)\n", __func__, __LINE__);
695
696 } else {
697
698 iu->iu_id = IU_ID_WRITE_READY;
699 iu->tag = cpu_to_be16(cmd->tag);
700
701 stream->req_status->complete = uasp_status_data_cmpl;
702 stream->req_status->context = cmd;
703
704 cmd->state = UASP_RECEIVE_DATA;
705 stream->req_status->buf = iu;
706 stream->req_status->length = sizeof(struct iu);
707
708 ret = usb_ep_queue(fu->ep_status, stream->req_status,
709 GFP_ATOMIC);
710 if (ret)
711 pr_err("%s(%d)\n", __func__, __LINE__);
712 }
713
714 wait_for_completion(&cmd->write_complete);
715 target_execute_cmd(se_cmd);
716cleanup:
717 return ret;
718}
719
720static int usbg_submit_command(struct f_uas *, void *, unsigned int);
721
722static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
723{
724 struct f_uas *fu = req->context;
725 int ret;
726
727 if (req->status < 0)
728 return;
729
730 ret = usbg_submit_command(fu, req->buf, req->actual);
731 /*
732 * Once we tune for performance enqueue the command req here again so
733 * we can receive a second command while we processing this one. Pay
734 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
735 * don't break HS.
736 */
737 if (!ret)
738 return;
739 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
740}
741
742static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
743{
744 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
745 if (!stream->req_in)
746 goto out;
747
748 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
749 if (!stream->req_out)
750 goto err_out;
751
752 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
753 if (!stream->req_status)
754 goto err_sts;
755
756 return 0;
757err_sts:
758 usb_ep_free_request(fu->ep_status, stream->req_status);
759 stream->req_status = NULL;
760err_out:
761 usb_ep_free_request(fu->ep_out, stream->req_out);
762 stream->req_out = NULL;
763out:
764 return -ENOMEM;
765}
766
767static int uasp_alloc_cmd(struct f_uas *fu)
768{
769 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
770 if (!fu->cmd.req)
771 goto err;
772
773 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
774 if (!fu->cmd.buf)
775 goto err_buf;
776
777 fu->cmd.req->complete = uasp_cmd_complete;
778 fu->cmd.req->buf = fu->cmd.buf;
779 fu->cmd.req->length = fu->ep_cmd->maxpacket;
780 fu->cmd.req->context = fu;
781 return 0;
782
783err_buf:
784 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
785err:
786 return -ENOMEM;
787}
788
789static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
790{
791 int i;
792
793 for (i = 0; i < max_streams; i++) {
794 struct uas_stream *s = &fu->stream[i];
795
796 s->req_in->stream_id = i + 1;
797 s->req_out->stream_id = i + 1;
798 s->req_status->stream_id = i + 1;
799 }
800}
801
802static int uasp_prepare_reqs(struct f_uas *fu)
803{
804 int ret;
805 int i;
806 int max_streams;
807
808 if (fu->flags & USBG_USE_STREAMS)
809 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
810 else
811 max_streams = 1;
812
813 for (i = 0; i < max_streams; i++) {
814 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
815 if (ret)
816 goto err_cleanup;
817 }
818
819 ret = uasp_alloc_cmd(fu);
820 if (ret)
821 goto err_free_stream;
822 uasp_setup_stream_res(fu, max_streams);
823
824 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
825 if (ret)
826 goto err_free_stream;
827
828 return 0;
829
830err_free_stream:
831 uasp_free_cmdreq(fu);
832
833err_cleanup:
834 if (i) {
835 do {
836 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
837 i--;
838 } while (i);
839 }
840 pr_err("UASP: endpoint setup failed\n");
841 return ret;
842}
843
844static void uasp_set_alt(struct f_uas *fu)
845{
846 struct usb_function *f = &fu->function;
847 struct usb_gadget *gadget = f->config->cdev->gadget;
848 int ret;
849
850 fu->flags = USBG_IS_UAS;
851
852 if (gadget->speed == USB_SPEED_SUPER)
853 fu->flags |= USBG_USE_STREAMS;
854
855 config_ep_by_speed(gadget, f, fu->ep_in);
856 ret = usb_ep_enable(fu->ep_in);
857 if (ret)
858 goto err_b_in;
859
860 config_ep_by_speed(gadget, f, fu->ep_out);
861 ret = usb_ep_enable(fu->ep_out);
862 if (ret)
863 goto err_b_out;
864
865 config_ep_by_speed(gadget, f, fu->ep_cmd);
866 ret = usb_ep_enable(fu->ep_cmd);
867 if (ret)
868 goto err_cmd;
869 config_ep_by_speed(gadget, f, fu->ep_status);
870 ret = usb_ep_enable(fu->ep_status);
871 if (ret)
872 goto err_status;
873
874 ret = uasp_prepare_reqs(fu);
875 if (ret)
876 goto err_wq;
877 fu->flags |= USBG_ENABLED;
878
879 pr_info("Using the UAS protocol\n");
880 return;
881err_wq:
882 usb_ep_disable(fu->ep_status);
883err_status:
884 usb_ep_disable(fu->ep_cmd);
885err_cmd:
886 usb_ep_disable(fu->ep_out);
887err_b_out:
888 usb_ep_disable(fu->ep_in);
889err_b_in:
890 fu->flags = 0;
891}
892
893static int get_cmd_dir(const unsigned char *cdb)
894{
895 int ret;
896
897 switch (cdb[0]) {
898 case READ_6:
899 case READ_10:
900 case READ_12:
901 case READ_16:
902 case INQUIRY:
903 case MODE_SENSE:
904 case MODE_SENSE_10:
905 case SERVICE_ACTION_IN_16:
906 case MAINTENANCE_IN:
907 case PERSISTENT_RESERVE_IN:
908 case SECURITY_PROTOCOL_IN:
909 case ACCESS_CONTROL_IN:
910 case REPORT_LUNS:
911 case READ_BLOCK_LIMITS:
912 case READ_POSITION:
913 case READ_CAPACITY:
914 case READ_TOC:
915 case READ_FORMAT_CAPACITIES:
916 case REQUEST_SENSE:
917 ret = DMA_FROM_DEVICE;
918 break;
919
920 case WRITE_6:
921 case WRITE_10:
922 case WRITE_12:
923 case WRITE_16:
924 case MODE_SELECT:
925 case MODE_SELECT_10:
926 case WRITE_VERIFY:
927 case WRITE_VERIFY_12:
928 case PERSISTENT_RESERVE_OUT:
929 case MAINTENANCE_OUT:
930 case SECURITY_PROTOCOL_OUT:
931 case ACCESS_CONTROL_OUT:
932 ret = DMA_TO_DEVICE;
933 break;
934 case ALLOW_MEDIUM_REMOVAL:
935 case TEST_UNIT_READY:
936 case SYNCHRONIZE_CACHE:
937 case START_STOP:
938 case ERASE:
939 case REZERO_UNIT:
940 case SEEK_10:
941 case SPACE:
942 case VERIFY:
943 case WRITE_FILEMARKS:
944 ret = DMA_NONE;
945 break;
946 default:
947#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
948 pr_warn(CMD_DIR_MSG, cdb[0]);
949#undef CMD_DIR_MSG
950 ret = -EINVAL;
951 }
952 return ret;
953}
954
955static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
956{
957 struct usbg_cmd *cmd = req->context;
958 struct se_cmd *se_cmd = &cmd->se_cmd;
959
960 if (req->status < 0) {
961 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
962 goto cleanup;
963 }
964
965 if (req->num_sgs == 0) {
966 sg_copy_from_buffer(se_cmd->t_data_sg,
967 se_cmd->t_data_nents,
968 cmd->data_buf,
969 se_cmd->data_length);
970 }
971
972 complete(&cmd->write_complete);
973 return;
974
975cleanup:
976 usbg_cleanup_cmd(cmd);
977}
978
979static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
980{
981 struct se_cmd *se_cmd = &cmd->se_cmd;
982 struct f_uas *fu = cmd->fu;
983 struct usb_gadget *gadget = fuas_to_gadget(fu);
984
985 if (!gadget->sg_supported) {
986 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
987 if (!cmd->data_buf)
988 return -ENOMEM;
989
990 req->buf = cmd->data_buf;
991 } else {
992 req->buf = NULL;
993 req->num_sgs = se_cmd->t_data_nents;
994 req->sg = se_cmd->t_data_sg;
995 }
996
997 req->complete = usbg_data_write_cmpl;
998 req->length = se_cmd->data_length;
999 req->context = cmd;
1000 return 0;
1001}
1002
1003static int usbg_send_status_response(struct se_cmd *se_cmd)
1004{
1005 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1006 se_cmd);
1007 struct f_uas *fu = cmd->fu;
1008
1009 if (fu->flags & USBG_IS_BOT)
1010 return bot_send_status_response(cmd);
1011 else
1012 return uasp_send_status_response(cmd);
1013}
1014
1015static int usbg_send_write_request(struct se_cmd *se_cmd)
1016{
1017 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1018 se_cmd);
1019 struct f_uas *fu = cmd->fu;
1020
1021 if (fu->flags & USBG_IS_BOT)
1022 return bot_send_write_request(cmd);
1023 else
1024 return uasp_send_write_request(cmd);
1025}
1026
1027static int usbg_send_read_response(struct se_cmd *se_cmd)
1028{
1029 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1030 se_cmd);
1031 struct f_uas *fu = cmd->fu;
1032
1033 if (fu->flags & USBG_IS_BOT)
1034 return bot_send_read_response(cmd);
1035 else
1036 return uasp_send_read_response(cmd);
1037}
1038
1039static void usbg_cmd_work(struct work_struct *work)
1040{
1041 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1042 struct se_cmd *se_cmd;
1043 struct tcm_usbg_nexus *tv_nexus;
1044 struct usbg_tpg *tpg;
1045 int dir;
1046
1047 se_cmd = &cmd->se_cmd;
1048 tpg = cmd->fu->tpg;
1049 tv_nexus = tpg->tpg_nexus;
1050 dir = get_cmd_dir(cmd->cmd_buf);
1051 if (dir < 0) {
1052 transport_init_se_cmd(se_cmd,
1053 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1054 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1055 cmd->prio_attr, cmd->sense_iu.sense);
1056 goto out;
1057 }
1058
1059 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1060 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1061 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1062 goto out;
1063
1064 return;
1065
1066out:
1067 transport_send_check_condition_and_sense(se_cmd,
1068 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1069 usbg_cleanup_cmd(cmd);
1070}
1071
1072static int usbg_submit_command(struct f_uas *fu,
1073 void *cmdbuf, unsigned int len)
1074{
1075 struct command_iu *cmd_iu = cmdbuf;
1076 struct usbg_cmd *cmd;
1077 struct usbg_tpg *tpg;
1078 struct se_cmd *se_cmd;
1079 struct tcm_usbg_nexus *tv_nexus;
1080 u32 cmd_len;
1081
1082 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1083 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1084 return -EINVAL;
1085 }
1086
1087 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1088 if (!cmd)
1089 return -ENOMEM;
1090
1091 cmd->fu = fu;
1092
1093 /* XXX until I figure out why I can't free in on complete */
1094 kref_init(&cmd->ref);
1095 kref_get(&cmd->ref);
1096
1097 tpg = fu->tpg;
1098 cmd_len = (cmd_iu->len & ~0x3) + 16;
1099 if (cmd_len > USBG_MAX_CMD)
1100 goto err;
1101
1102 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1103
1104 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1105 cmd->se_cmd.tag = cmd->tag;
1106 if (fu->flags & USBG_USE_STREAMS) {
1107 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1108 goto err;
1109 if (!cmd->tag)
1110 cmd->stream = &fu->stream[0];
1111 else
1112 cmd->stream = &fu->stream[cmd->tag - 1];
1113 } else {
1114 cmd->stream = &fu->stream[0];
1115 }
1116
1117 tv_nexus = tpg->tpg_nexus;
1118 if (!tv_nexus) {
1119 pr_err("Missing nexus, ignoring command\n");
1120 goto err;
1121 }
1122
1123 switch (cmd_iu->prio_attr & 0x7) {
1124 case UAS_HEAD_TAG:
1125 cmd->prio_attr = TCM_HEAD_TAG;
1126 break;
1127 case UAS_ORDERED_TAG:
1128 cmd->prio_attr = TCM_ORDERED_TAG;
1129 break;
1130 case UAS_ACA:
1131 cmd->prio_attr = TCM_ACA_TAG;
1132 break;
1133 default:
1134 pr_debug_once("Unsupported prio_attr: %02x.\n",
1135 cmd_iu->prio_attr);
1136 case UAS_SIMPLE_TAG:
1137 cmd->prio_attr = TCM_SIMPLE_TAG;
1138 break;
1139 }
1140
1141 se_cmd = &cmd->se_cmd;
1142 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1143
1144 INIT_WORK(&cmd->work, usbg_cmd_work);
1145 queue_work(tpg->workqueue, &cmd->work);
1146
1147 return 0;
1148err:
1149 kfree(cmd);
1150 return -EINVAL;
1151}
1152
1153static void bot_cmd_work(struct work_struct *work)
1154{
1155 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1156 struct se_cmd *se_cmd;
1157 struct tcm_usbg_nexus *tv_nexus;
1158 struct usbg_tpg *tpg;
1159 int dir;
1160
1161 se_cmd = &cmd->se_cmd;
1162 tpg = cmd->fu->tpg;
1163 tv_nexus = tpg->tpg_nexus;
1164 dir = get_cmd_dir(cmd->cmd_buf);
1165 if (dir < 0) {
1166 transport_init_se_cmd(se_cmd,
1167 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1168 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1169 cmd->prio_attr, cmd->sense_iu.sense);
1170 goto out;
1171 }
1172
1173 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1174 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1175 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1176 goto out;
1177
1178 return;
1179
1180out:
1181 transport_send_check_condition_and_sense(se_cmd,
1182 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1183 usbg_cleanup_cmd(cmd);
1184}
1185
1186static int bot_submit_command(struct f_uas *fu,
1187 void *cmdbuf, unsigned int len)
1188{
1189 struct bulk_cb_wrap *cbw = cmdbuf;
1190 struct usbg_cmd *cmd;
1191 struct usbg_tpg *tpg;
1192 struct se_cmd *se_cmd;
1193 struct tcm_usbg_nexus *tv_nexus;
1194 u32 cmd_len;
1195
1196 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1197 pr_err("Wrong signature on CBW\n");
1198 return -EINVAL;
1199 }
1200 if (len != 31) {
1201 pr_err("Wrong length for CBW\n");
1202 return -EINVAL;
1203 }
1204
1205 cmd_len = cbw->Length;
1206 if (cmd_len < 1 || cmd_len > 16)
1207 return -EINVAL;
1208
1209 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1210 if (!cmd)
1211 return -ENOMEM;
1212
1213 cmd->fu = fu;
1214
1215 /* XXX until I figure out why I can't free in on complete */
1216 kref_init(&cmd->ref);
1217 kref_get(&cmd->ref);
1218
1219 tpg = fu->tpg;
1220
1221 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1222
1223 cmd->bot_tag = cbw->Tag;
1224
1225 tv_nexus = tpg->tpg_nexus;
1226 if (!tv_nexus) {
1227 pr_err("Missing nexus, ignoring command\n");
1228 goto err;
1229 }
1230
1231 cmd->prio_attr = TCM_SIMPLE_TAG;
1232 se_cmd = &cmd->se_cmd;
1233 cmd->unpacked_lun = cbw->Lun;
1234 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1235 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1236 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1237
1238 INIT_WORK(&cmd->work, bot_cmd_work);
1239 queue_work(tpg->workqueue, &cmd->work);
1240
1241 return 0;
1242err:
1243 kfree(cmd);
1244 return -EINVAL;
1245}
1246
1247/* Start fabric.c code */
1248
1249static int usbg_check_true(struct se_portal_group *se_tpg)
1250{
1251 return 1;
1252}
1253
1254static int usbg_check_false(struct se_portal_group *se_tpg)
1255{
1256 return 0;
1257}
1258
1259static char *usbg_get_fabric_name(void)
1260{
1261 return "usb_gadget";
1262}
1263
1264static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1265{
1266 struct usbg_tpg *tpg = container_of(se_tpg,
1267 struct usbg_tpg, se_tpg);
1268 struct usbg_tport *tport = tpg->tport;
1269
1270 return &tport->tport_name[0];
1271}
1272
1273static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1274{
1275 struct usbg_tpg *tpg = container_of(se_tpg,
1276 struct usbg_tpg, se_tpg);
1277 return tpg->tport_tpgt;
1278}
1279
1280static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1281{
1282 return 1;
1283}
1284
1285static void usbg_cmd_release(struct kref *ref)
1286{
1287 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1288 ref);
1289
1290 transport_generic_free_cmd(&cmd->se_cmd, 0);
1291}
1292
1293static void usbg_release_cmd(struct se_cmd *se_cmd)
1294{
1295 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1296 se_cmd);
1297 kfree(cmd->data_buf);
1298 kfree(cmd);
1299}
1300
1301static int usbg_shutdown_session(struct se_session *se_sess)
1302{
1303 return 0;
1304}
1305
1306static void usbg_close_session(struct se_session *se_sess)
1307{
1308}
1309
1310static u32 usbg_sess_get_index(struct se_session *se_sess)
1311{
1312 return 0;
1313}
1314
1315/*
1316 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1317 */
1318static int usbg_write_pending_status(struct se_cmd *se_cmd)
1319{
1320 return 0;
1321}
1322
1323static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1324{
1325}
1326
1327static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1328{
1329 return 0;
1330}
1331
1332static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1333{
1334}
1335
1336static void usbg_aborted_task(struct se_cmd *se_cmd)
1337{
1338}
1339
1340static const char *usbg_check_wwn(const char *name)
1341{
1342 const char *n;
1343 unsigned int len;
1344
1345 n = strstr(name, "naa.");
1346 if (!n)
1347 return NULL;
1348 n += 4;
1349 len = strlen(n);
1350 if (len == 0 || len > USBG_NAMELEN - 1)
1351 return NULL;
1352 return n;
1353}
1354
1355static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1356{
1357 if (!usbg_check_wwn(name))
1358 return -EINVAL;
1359 return 0;
1360}
1361
1362struct usbg_tpg *the_only_tpg_I_currently_have;
1363
1364static struct se_portal_group *usbg_make_tpg(
1365 struct se_wwn *wwn,
1366 struct config_group *group,
1367 const char *name)
1368{
1369 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1370 tport_wwn);
1371 struct usbg_tpg *tpg;
1372 unsigned long tpgt;
1373 int ret;
1374
1375 if (strstr(name, "tpgt_") != name)
1376 return ERR_PTR(-EINVAL);
1377 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1378 return ERR_PTR(-EINVAL);
1379 if (the_only_tpg_I_currently_have) {
1380 pr_err("Until the gadget framework can't handle multiple\n");
1381 pr_err("gadgets, you can't do this here.\n");
1382 return ERR_PTR(-EBUSY);
1383 }
1384
1385 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1386 if (!tpg)
1387 return ERR_PTR(-ENOMEM);
1388 mutex_init(&tpg->tpg_mutex);
1389 atomic_set(&tpg->tpg_port_count, 0);
1390 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1391 if (!tpg->workqueue) {
1392 kfree(tpg);
1393 return NULL;
1394 }
1395
1396 tpg->tport = tport;
1397 tpg->tport_tpgt = tpgt;
1398
1399 /*
1400 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1401 * pretend to be SAS..
1402 */
1403 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1404 if (ret < 0) {
1405 destroy_workqueue(tpg->workqueue);
1406 kfree(tpg);
1407 return NULL;
1408 }
1409 the_only_tpg_I_currently_have = tpg;
1410 return &tpg->se_tpg;
1411}
1412
1413static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1414
1415static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1416{
1417 struct usbg_tpg *tpg = container_of(se_tpg,
1418 struct usbg_tpg, se_tpg);
1419
1420 tcm_usbg_drop_nexus(tpg);
1421 core_tpg_deregister(se_tpg);
1422 destroy_workqueue(tpg->workqueue);
1423 kfree(tpg);
1424 the_only_tpg_I_currently_have = NULL;
1425}
1426
1427static struct se_wwn *usbg_make_tport(
1428 struct target_fabric_configfs *tf,
1429 struct config_group *group,
1430 const char *name)
1431{
1432 struct usbg_tport *tport;
1433 const char *wnn_name;
1434 u64 wwpn = 0;
1435
1436 wnn_name = usbg_check_wwn(name);
1437 if (!wnn_name)
1438 return ERR_PTR(-EINVAL);
1439
1440 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1441 if (!(tport))
1442 return ERR_PTR(-ENOMEM);
1443 tport->tport_wwpn = wwpn;
1444 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1445 return &tport->tport_wwn;
1446}
1447
1448static void usbg_drop_tport(struct se_wwn *wwn)
1449{
1450 struct usbg_tport *tport = container_of(wwn,
1451 struct usbg_tport, tport_wwn);
1452 kfree(tport);
1453}
1454
1455/*
1456 * If somebody feels like dropping the version property, go ahead.
1457 */
1458static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1459{
1460 return sprintf(page, "usb-gadget fabric module\n");
1461}
1462
1463CONFIGFS_ATTR_RO(usbg_wwn_, version);
1464
1465static struct configfs_attribute *usbg_wwn_attrs[] = {
1466 &usbg_wwn_attr_version,
1467 NULL,
1468};
1469
1470static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1471{
1472 struct se_portal_group *se_tpg = to_tpg(item);
1473 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1474
1475 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1476}
1477
1478static int usbg_attach(struct usbg_tpg *);
1479static void usbg_detach(struct usbg_tpg *);
1480
1481static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1482 const char *page, size_t count)
1483{
1484 struct se_portal_group *se_tpg = to_tpg(item);
1485 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1486 bool op;
1487 ssize_t ret;
1488
1489 ret = strtobool(page, &op);
1490 if (ret)
1491 return ret;
1492
1493 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1494 return -EINVAL;
1495
1496 if (op)
1497 ret = usbg_attach(tpg);
1498 else
1499 usbg_detach(tpg);
1500 if (ret)
1501 return ret;
1502
1503 tpg->gadget_connect = op;
1504
1505 return count;
1506}
1507
1508static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1509{
1510 struct se_portal_group *se_tpg = to_tpg(item);
1511 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1512 struct tcm_usbg_nexus *tv_nexus;
1513 ssize_t ret;
1514
1515 mutex_lock(&tpg->tpg_mutex);
1516 tv_nexus = tpg->tpg_nexus;
1517 if (!tv_nexus) {
1518 ret = -ENODEV;
1519 goto out;
1520 }
1521 ret = snprintf(page, PAGE_SIZE, "%s\n",
1522 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1523out:
1524 mutex_unlock(&tpg->tpg_mutex);
1525 return ret;
1526}
1527
1528static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1529{
1530 struct se_portal_group *se_tpg;
1531 struct tcm_usbg_nexus *tv_nexus;
1532 int ret;
1533
1534 mutex_lock(&tpg->tpg_mutex);
1535 if (tpg->tpg_nexus) {
1536 ret = -EEXIST;
1537 pr_debug("tpg->tpg_nexus already exists\n");
1538 goto err_unlock;
1539 }
1540 se_tpg = &tpg->se_tpg;
1541
1542 ret = -ENOMEM;
1543 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1544 if (!tv_nexus)
1545 goto err_unlock;
1546 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1547 if (IS_ERR(tv_nexus->tvn_se_sess))
1548 goto err_free;
1549
1550 /*
1551 * Since we are running in 'demo mode' this call with generate a
1552 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1553 * the SCSI Initiator port name of the passed configfs group 'name'.
1554 */
1555 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1556 se_tpg, name);
1557 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1558#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1559 pr_debug(MAKE_NEXUS_MSG, name);
1560#undef MAKE_NEXUS_MSG
1561 goto err_session;
1562 }
1563 /*
1564 * Now register the TCM vHost virtual I_T Nexus as active.
1565 */
1566 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1567 tv_nexus->tvn_se_sess, tv_nexus);
1568 tpg->tpg_nexus = tv_nexus;
1569 mutex_unlock(&tpg->tpg_mutex);
1570 return 0;
1571
1572err_session:
1573 transport_free_session(tv_nexus->tvn_se_sess);
1574err_free:
1575 kfree(tv_nexus);
1576err_unlock:
1577 mutex_unlock(&tpg->tpg_mutex);
1578 return ret;
1579}
1580
1581static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1582{
1583 struct se_session *se_sess;
1584 struct tcm_usbg_nexus *tv_nexus;
1585 int ret = -ENODEV;
1586
1587 mutex_lock(&tpg->tpg_mutex);
1588 tv_nexus = tpg->tpg_nexus;
1589 if (!tv_nexus)
1590 goto out;
1591
1592 se_sess = tv_nexus->tvn_se_sess;
1593 if (!se_sess)
1594 goto out;
1595
1596 if (atomic_read(&tpg->tpg_port_count)) {
1597 ret = -EPERM;
1598#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1599 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1600#undef MSG
1601 goto out;
1602 }
1603
1604 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1605 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1606 /*
1607 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1608 */
1609 transport_deregister_session(tv_nexus->tvn_se_sess);
1610 tpg->tpg_nexus = NULL;
1611
1612 kfree(tv_nexus);
1613 ret = 0;
1614out:
1615 mutex_unlock(&tpg->tpg_mutex);
1616 return ret;
1617}
1618
1619static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1620 const char *page, size_t count)
1621{
1622 struct se_portal_group *se_tpg = to_tpg(item);
1623 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1624 unsigned char i_port[USBG_NAMELEN], *ptr;
1625 int ret;
1626
1627 if (!strncmp(page, "NULL", 4)) {
1628 ret = tcm_usbg_drop_nexus(tpg);
1629 return (!ret) ? count : ret;
1630 }
1631 if (strlen(page) >= USBG_NAMELEN) {
1632
1633#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1634 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1635#undef NEXUS_STORE_MSG
1636 return -EINVAL;
1637 }
1638 snprintf(i_port, USBG_NAMELEN, "%s", page);
1639
1640 ptr = strstr(i_port, "naa.");
1641 if (!ptr) {
1642 pr_err("Missing 'naa.' prefix\n");
1643 return -EINVAL;
1644 }
1645
1646 if (i_port[strlen(i_port) - 1] == '\n')
1647 i_port[strlen(i_port) - 1] = '\0';
1648
1649 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1650 if (ret < 0)
1651 return ret;
1652 return count;
1653}
1654
1655CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1656CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1657
1658static struct configfs_attribute *usbg_base_attrs[] = {
1659 &tcm_usbg_tpg_attr_enable,
1660 &tcm_usbg_tpg_attr_nexus,
1661 NULL,
1662};
1663
1664static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1665{
1666 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1667
1668 atomic_inc(&tpg->tpg_port_count);
1669 smp_mb__after_atomic();
1670 return 0;
1671}
1672
1673static void usbg_port_unlink(struct se_portal_group *se_tpg,
1674 struct se_lun *se_lun)
1675{
1676 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1677
1678 atomic_dec(&tpg->tpg_port_count);
1679 smp_mb__after_atomic();
1680}
1681
1682static int usbg_check_stop_free(struct se_cmd *se_cmd)
1683{
1684 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1685 se_cmd);
1686
1687 kref_put(&cmd->ref, usbg_cmd_release);
1688 return 1;
1689}
1690
1691static const struct target_core_fabric_ops usbg_ops = {
1692 .module = THIS_MODULE,
1693 .name = "usb_gadget",
1694 .get_fabric_name = usbg_get_fabric_name,
1695 .tpg_get_wwn = usbg_get_fabric_wwn,
1696 .tpg_get_tag = usbg_get_tag,
1697 .tpg_check_demo_mode = usbg_check_true,
1698 .tpg_check_demo_mode_cache = usbg_check_false,
1699 .tpg_check_demo_mode_write_protect = usbg_check_false,
1700 .tpg_check_prod_mode_write_protect = usbg_check_false,
1701 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1702 .release_cmd = usbg_release_cmd,
1703 .shutdown_session = usbg_shutdown_session,
1704 .close_session = usbg_close_session,
1705 .sess_get_index = usbg_sess_get_index,
1706 .sess_get_initiator_sid = NULL,
1707 .write_pending = usbg_send_write_request,
1708 .write_pending_status = usbg_write_pending_status,
1709 .set_default_node_attributes = usbg_set_default_node_attrs,
1710 .get_cmd_state = usbg_get_cmd_state,
1711 .queue_data_in = usbg_send_read_response,
1712 .queue_status = usbg_send_status_response,
1713 .queue_tm_rsp = usbg_queue_tm_rsp,
1714 .aborted_task = usbg_aborted_task,
1715 .check_stop_free = usbg_check_stop_free,
1716
1717 .fabric_make_wwn = usbg_make_tport,
1718 .fabric_drop_wwn = usbg_drop_tport,
1719 .fabric_make_tpg = usbg_make_tpg,
1720 .fabric_drop_tpg = usbg_drop_tpg,
1721 .fabric_post_link = usbg_port_link,
1722 .fabric_pre_unlink = usbg_port_unlink,
1723 .fabric_init_nodeacl = usbg_init_nodeacl,
1724
1725 .tfc_wwn_attrs = usbg_wwn_attrs,
1726 .tfc_tpg_base_attrs = usbg_base_attrs,
1727};
1728
1729/* Start gadget.c code */
1730
1731static struct usb_interface_descriptor bot_intf_desc = {
1732 .bLength = sizeof(bot_intf_desc),
1733 .bDescriptorType = USB_DT_INTERFACE,
1734 .bNumEndpoints = 2,
1735 .bAlternateSetting = USB_G_ALT_INT_BBB,
1736 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1737 .bInterfaceSubClass = USB_SC_SCSI,
1738 .bInterfaceProtocol = USB_PR_BULK,
1739};
1740
1741static struct usb_interface_descriptor uasp_intf_desc = {
1742 .bLength = sizeof(uasp_intf_desc),
1743 .bDescriptorType = USB_DT_INTERFACE,
1744 .bNumEndpoints = 4,
1745 .bAlternateSetting = USB_G_ALT_INT_UAS,
1746 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1747 .bInterfaceSubClass = USB_SC_SCSI,
1748 .bInterfaceProtocol = USB_PR_UAS,
1749};
1750
1751static struct usb_endpoint_descriptor uasp_bi_desc = {
1752 .bLength = USB_DT_ENDPOINT_SIZE,
1753 .bDescriptorType = USB_DT_ENDPOINT,
1754 .bEndpointAddress = USB_DIR_IN,
1755 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1756 .wMaxPacketSize = cpu_to_le16(512),
1757};
1758
1759static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1760 .bLength = USB_DT_ENDPOINT_SIZE,
1761 .bDescriptorType = USB_DT_ENDPOINT,
1762 .bEndpointAddress = USB_DIR_IN,
1763 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1764};
1765
1766static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1767 .bLength = sizeof(uasp_bi_pipe_desc),
1768 .bDescriptorType = USB_DT_PIPE_USAGE,
1769 .bPipeID = DATA_IN_PIPE_ID,
1770};
1771
1772static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1773 .bLength = USB_DT_ENDPOINT_SIZE,
1774 .bDescriptorType = USB_DT_ENDPOINT,
1775 .bEndpointAddress = USB_DIR_IN,
1776 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1777 .wMaxPacketSize = cpu_to_le16(1024),
1778};
1779
1780static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1781 .bLength = sizeof(uasp_bi_ep_comp_desc),
1782 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1783 .bMaxBurst = 0,
1784 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1785 .wBytesPerInterval = 0,
1786};
1787
1788static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1789 .bLength = sizeof(bot_bi_ep_comp_desc),
1790 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1791 .bMaxBurst = 0,
1792};
1793
1794static struct usb_endpoint_descriptor uasp_bo_desc = {
1795 .bLength = USB_DT_ENDPOINT_SIZE,
1796 .bDescriptorType = USB_DT_ENDPOINT,
1797 .bEndpointAddress = USB_DIR_OUT,
1798 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1799 .wMaxPacketSize = cpu_to_le16(512),
1800};
1801
1802static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1803 .bLength = USB_DT_ENDPOINT_SIZE,
1804 .bDescriptorType = USB_DT_ENDPOINT,
1805 .bEndpointAddress = USB_DIR_OUT,
1806 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1807};
1808
1809static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1810 .bLength = sizeof(uasp_bo_pipe_desc),
1811 .bDescriptorType = USB_DT_PIPE_USAGE,
1812 .bPipeID = DATA_OUT_PIPE_ID,
1813};
1814
1815static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1816 .bLength = USB_DT_ENDPOINT_SIZE,
1817 .bDescriptorType = USB_DT_ENDPOINT,
1818 .bEndpointAddress = USB_DIR_OUT,
1819 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1820 .wMaxPacketSize = cpu_to_le16(0x400),
1821};
1822
1823static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1824 .bLength = sizeof(uasp_bo_ep_comp_desc),
1825 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1826 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1827};
1828
1829static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1830 .bLength = sizeof(bot_bo_ep_comp_desc),
1831 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1832};
1833
1834static struct usb_endpoint_descriptor uasp_status_desc = {
1835 .bLength = USB_DT_ENDPOINT_SIZE,
1836 .bDescriptorType = USB_DT_ENDPOINT,
1837 .bEndpointAddress = USB_DIR_IN,
1838 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1839 .wMaxPacketSize = cpu_to_le16(512),
1840};
1841
1842static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1843 .bLength = USB_DT_ENDPOINT_SIZE,
1844 .bDescriptorType = USB_DT_ENDPOINT,
1845 .bEndpointAddress = USB_DIR_IN,
1846 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1847};
1848
1849static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1850 .bLength = sizeof(uasp_status_pipe_desc),
1851 .bDescriptorType = USB_DT_PIPE_USAGE,
1852 .bPipeID = STATUS_PIPE_ID,
1853};
1854
1855static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1856 .bLength = USB_DT_ENDPOINT_SIZE,
1857 .bDescriptorType = USB_DT_ENDPOINT,
1858 .bEndpointAddress = USB_DIR_IN,
1859 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1860 .wMaxPacketSize = cpu_to_le16(1024),
1861};
1862
1863static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1864 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1865 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1866 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1867};
1868
1869static struct usb_endpoint_descriptor uasp_cmd_desc = {
1870 .bLength = USB_DT_ENDPOINT_SIZE,
1871 .bDescriptorType = USB_DT_ENDPOINT,
1872 .bEndpointAddress = USB_DIR_OUT,
1873 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1874 .wMaxPacketSize = cpu_to_le16(512),
1875};
1876
1877static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1878 .bLength = USB_DT_ENDPOINT_SIZE,
1879 .bDescriptorType = USB_DT_ENDPOINT,
1880 .bEndpointAddress = USB_DIR_OUT,
1881 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1882};
1883
1884static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1885 .bLength = sizeof(uasp_cmd_pipe_desc),
1886 .bDescriptorType = USB_DT_PIPE_USAGE,
1887 .bPipeID = CMD_PIPE_ID,
1888};
1889
1890static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1891 .bLength = USB_DT_ENDPOINT_SIZE,
1892 .bDescriptorType = USB_DT_ENDPOINT,
1893 .bEndpointAddress = USB_DIR_OUT,
1894 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1895 .wMaxPacketSize = cpu_to_le16(1024),
1896};
1897
1898static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1899 .bLength = sizeof(uasp_cmd_comp_desc),
1900 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1901};
1902
1903static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1904 (struct usb_descriptor_header *) &bot_intf_desc,
1905 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1906 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1907
1908 (struct usb_descriptor_header *) &uasp_intf_desc,
1909 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1910 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1911 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1912 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1913 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1914 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1915 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1916 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1917 NULL,
1918};
1919
1920static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1921 (struct usb_descriptor_header *) &bot_intf_desc,
1922 (struct usb_descriptor_header *) &uasp_bi_desc,
1923 (struct usb_descriptor_header *) &uasp_bo_desc,
1924
1925 (struct usb_descriptor_header *) &uasp_intf_desc,
1926 (struct usb_descriptor_header *) &uasp_bi_desc,
1927 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1928 (struct usb_descriptor_header *) &uasp_bo_desc,
1929 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1930 (struct usb_descriptor_header *) &uasp_status_desc,
1931 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1932 (struct usb_descriptor_header *) &uasp_cmd_desc,
1933 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1934 NULL,
1935};
1936
1937static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1938 (struct usb_descriptor_header *) &bot_intf_desc,
1939 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1940 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1941 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1942 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1943
1944 (struct usb_descriptor_header *) &uasp_intf_desc,
1945 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1946 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1947 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1948 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1949 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1950 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1951 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1952 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1953 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1954 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1955 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1956 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1957 NULL,
1958};
1959
1960static struct usb_string tcm_us_strings[] = {
1961 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1962 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1963 { },
1964};
1965
1966static struct usb_gadget_strings tcm_stringtab = {
1967 .language = 0x0409,
1968 .strings = tcm_us_strings,
1969};
1970
1971static struct usb_gadget_strings *tcm_strings[] = {
1972 &tcm_stringtab,
1973 NULL,
1974};
1975
1976static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1977{
1978 struct f_uas *fu = to_f_uas(f);
1979 struct usb_gadget *gadget = c->cdev->gadget;
1980 struct usb_ep *ep;
1981 int iface;
1982 int ret;
1983
1984 iface = usb_interface_id(c, f);
1985 if (iface < 0)
1986 return iface;
1987
1988 bot_intf_desc.bInterfaceNumber = iface;
1989 uasp_intf_desc.bInterfaceNumber = iface;
1990 fu->iface = iface;
1991 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
1992 &uasp_bi_ep_comp_desc);
1993 if (!ep)
1994 goto ep_fail;
1995
1996 fu->ep_in = ep;
1997
1998 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
1999 &uasp_bo_ep_comp_desc);
2000 if (!ep)
2001 goto ep_fail;
2002 fu->ep_out = ep;
2003
2004 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2005 &uasp_status_in_ep_comp_desc);
2006 if (!ep)
2007 goto ep_fail;
2008 fu->ep_status = ep;
2009
2010 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2011 &uasp_cmd_comp_desc);
2012 if (!ep)
2013 goto ep_fail;
2014 fu->ep_cmd = ep;
2015
2016 /* Assume endpoint addresses are the same for both speeds */
2017 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2018 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2019 uasp_status_desc.bEndpointAddress =
2020 uasp_ss_status_desc.bEndpointAddress;
2021 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2022
2023 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2024 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2025 uasp_fs_status_desc.bEndpointAddress =
2026 uasp_ss_status_desc.bEndpointAddress;
2027 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2028
2029 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2030 uasp_hs_function_desc, uasp_ss_function_desc);
2031 if (ret)
2032 goto ep_fail;
2033
2034 return 0;
2035ep_fail:
2036 pr_err("Can't claim all required eps\n");
2037
2038 return -ENOTSUPP;
2039}
2040
2041static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2042{
2043 struct f_uas *fu = to_f_uas(f);
2044
2045 usb_free_all_descriptors(f);
2046 kfree(fu);
2047}
2048
2049struct guas_setup_wq {
2050 struct work_struct work;
2051 struct f_uas *fu;
2052 unsigned int alt;
2053};
2054
2055static void tcm_delayed_set_alt(struct work_struct *wq)
2056{
2057 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2058 work);
2059 struct f_uas *fu = work->fu;
2060 int alt = work->alt;
2061
2062 kfree(work);
2063
2064 if (fu->flags & USBG_IS_BOT)
2065 bot_cleanup_old_alt(fu);
2066 if (fu->flags & USBG_IS_UAS)
2067 uasp_cleanup_old_alt(fu);
2068
2069 if (alt == USB_G_ALT_INT_BBB)
2070 bot_set_alt(fu);
2071 else if (alt == USB_G_ALT_INT_UAS)
2072 uasp_set_alt(fu);
2073 usb_composite_setup_continue(fu->function.config->cdev);
2074}
2075
2076static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2077{
2078 struct f_uas *fu = to_f_uas(f);
2079
2080 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2081 struct guas_setup_wq *work;
2082
2083 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2084 if (!work)
2085 return -ENOMEM;
2086 INIT_WORK(&work->work, tcm_delayed_set_alt);
2087 work->fu = fu;
2088 work->alt = alt;
2089 schedule_work(&work->work);
2090 return USB_GADGET_DELAYED_STATUS;
2091 }
2092 return -EOPNOTSUPP;
2093}
2094
2095static void tcm_disable(struct usb_function *f)
2096{
2097 struct f_uas *fu = to_f_uas(f);
2098
2099 if (fu->flags & USBG_IS_UAS)
2100 uasp_cleanup_old_alt(fu);
2101 else if (fu->flags & USBG_IS_BOT)
2102 bot_cleanup_old_alt(fu);
2103 fu->flags = 0;
2104}
2105
2106static int tcm_setup(struct usb_function *f,
2107 const struct usb_ctrlrequest *ctrl)
2108{
2109 struct f_uas *fu = to_f_uas(f);
2110
2111 if (!(fu->flags & USBG_IS_BOT))
2112 return -EOPNOTSUPP;
2113
2114 return usbg_bot_setup(f, ctrl);
2115}
2116
2117static int tcm_bind_config(struct usb_configuration *c)
2118{
2119 struct f_uas *fu;
2120 int ret;
2121
2122 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2123 if (!fu)
2124 return -ENOMEM;
2125 fu->function.name = "Target Function";
2126 fu->function.bind = tcm_bind;
2127 fu->function.unbind = tcm_unbind;
2128 fu->function.set_alt = tcm_set_alt;
2129 fu->function.setup = tcm_setup;
2130 fu->function.disable = tcm_disable;
2131 fu->function.strings = tcm_strings;
2132 fu->tpg = the_only_tpg_I_currently_have;
2133
2134 bot_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_BBB].id;
2135 uasp_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_UAS].id;
2136
2137 ret = usb_add_function(c, &fu->function);
2138 if (ret)
2139 goto err;
2140
2141 return 0;
2142err:
2143 kfree(fu);
2144 return ret;
2145}
Linux kernel - Deliverables
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