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1// SPDX-License-Identifier: GPL-2.0
2/* Target based USB-Gadget
3 *
4 * UAS protocol handling, target callbacks, configfs handling,
5 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
6 *
7 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
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 <linux/unaligned.h>
23
24#include "tcm.h"
25#include "u_tcm.h"
26#include "configfs.h"
27
28#define TPG_INSTANCES 1
29
30struct tpg_instance {
31 struct usb_function_instance *func_inst;
32 struct usbg_tpg *tpg;
33};
34
35static struct tpg_instance tpg_instances[TPG_INSTANCES];
36
37static DEFINE_MUTEX(tpg_instances_lock);
38
39static inline struct f_uas *to_f_uas(struct usb_function *f)
40{
41 return container_of(f, struct f_uas, function);
42}
43
44/* Start bot.c code */
45
46static int bot_enqueue_cmd_cbw(struct f_uas *fu)
47{
48 int ret;
49
50 if (fu->flags & USBG_BOT_CMD_PEND)
51 return 0;
52
53 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
54 if (!ret)
55 fu->flags |= USBG_BOT_CMD_PEND;
56 return ret;
57}
58
59static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
60{
61 struct usbg_cmd *cmd = req->context;
62 struct f_uas *fu = cmd->fu;
63
64 transport_generic_free_cmd(&cmd->se_cmd, 0);
65 if (req->status < 0) {
66 pr_err("ERR %s(%d)\n", __func__, __LINE__);
67 return;
68 }
69
70 /* CSW completed, wait for next CBW */
71 bot_enqueue_cmd_cbw(fu);
72}
73
74static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
75{
76 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
77 int ret;
78 unsigned int csw_stat;
79
80 csw_stat = cmd->csw_code;
81 csw->Tag = cmd->bot_tag;
82 csw->Status = csw_stat;
83 fu->bot_status.req->context = cmd;
84 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
85 if (ret)
86 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
87}
88
89static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
90{
91 struct usbg_cmd *cmd = req->context;
92 struct f_uas *fu = cmd->fu;
93
94 if (req->status < 0)
95 pr_err("ERR %s(%d)\n", __func__, __LINE__);
96
97 if (cmd->data_len) {
98 if (cmd->data_len > ep->maxpacket) {
99 req->length = ep->maxpacket;
100 cmd->data_len -= ep->maxpacket;
101 } else {
102 req->length = cmd->data_len;
103 cmd->data_len = 0;
104 }
105
106 usb_ep_queue(ep, req, GFP_ATOMIC);
107 return;
108 }
109 bot_enqueue_sense_code(fu, cmd);
110}
111
112static void bot_send_bad_status(struct usbg_cmd *cmd)
113{
114 struct f_uas *fu = cmd->fu;
115 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
116 struct usb_request *req;
117 struct usb_ep *ep;
118
119 csw->Residue = cpu_to_le32(cmd->data_len);
120
121 if (cmd->data_len) {
122 if (cmd->is_read) {
123 ep = fu->ep_in;
124 req = fu->bot_req_in;
125 } else {
126 ep = fu->ep_out;
127 req = fu->bot_req_out;
128 }
129
130 if (cmd->data_len > fu->ep_in->maxpacket) {
131 req->length = ep->maxpacket;
132 cmd->data_len -= ep->maxpacket;
133 } else {
134 req->length = cmd->data_len;
135 cmd->data_len = 0;
136 }
137 req->complete = bot_err_compl;
138 req->context = cmd;
139 req->buf = fu->cmd.buf;
140 usb_ep_queue(ep, req, GFP_KERNEL);
141 } else {
142 bot_enqueue_sense_code(fu, cmd);
143 }
144}
145
146static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
147{
148 struct f_uas *fu = cmd->fu;
149 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
150 int ret;
151
152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
153 if (!moved_data && cmd->data_len) {
154 /*
155 * the host wants to move data, we don't. Fill / empty
156 * the pipe and then send the csw with reside set.
157 */
158 cmd->csw_code = US_BULK_STAT_OK;
159 bot_send_bad_status(cmd);
160 return 0;
161 }
162
163 csw->Tag = cmd->bot_tag;
164 csw->Residue = cpu_to_le32(0);
165 csw->Status = US_BULK_STAT_OK;
166 fu->bot_status.req->context = cmd;
167
168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
169 if (ret)
170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
171 } else {
172 cmd->csw_code = US_BULK_STAT_FAIL;
173 bot_send_bad_status(cmd);
174 }
175 return 0;
176}
177
178/*
179 * Called after command (no data transfer) or after the write (to device)
180 * operation is completed
181 */
182static int bot_send_status_response(struct usbg_cmd *cmd)
183{
184 bool moved_data = false;
185
186 if (!cmd->is_read)
187 moved_data = true;
188 return bot_send_status(cmd, moved_data);
189}
190
191/* Read request completed, now we have to send the CSW */
192static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
193{
194 struct usbg_cmd *cmd = req->context;
195
196 if (req->status < 0)
197 pr_err("ERR %s(%d)\n", __func__, __LINE__);
198
199 bot_send_status(cmd, true);
200}
201
202static int bot_send_read_response(struct usbg_cmd *cmd)
203{
204 struct f_uas *fu = cmd->fu;
205 struct se_cmd *se_cmd = &cmd->se_cmd;
206 struct usb_gadget *gadget = fuas_to_gadget(fu);
207 int ret;
208
209 if (!cmd->data_len) {
210 cmd->csw_code = US_BULK_STAT_PHASE;
211 bot_send_bad_status(cmd);
212 return 0;
213 }
214
215 if (!gadget->sg_supported) {
216 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
217 if (!cmd->data_buf)
218 return -ENOMEM;
219
220 sg_copy_to_buffer(se_cmd->t_data_sg,
221 se_cmd->t_data_nents,
222 cmd->data_buf,
223 se_cmd->data_length);
224
225 fu->bot_req_in->buf = cmd->data_buf;
226 } else {
227 fu->bot_req_in->buf = NULL;
228 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
229 fu->bot_req_in->sg = se_cmd->t_data_sg;
230 }
231
232 fu->bot_req_in->complete = bot_read_compl;
233 fu->bot_req_in->length = se_cmd->data_length;
234 fu->bot_req_in->context = cmd;
235 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
236 if (ret)
237 pr_err("%s(%d)\n", __func__, __LINE__);
238 return 0;
239}
240
241static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
242static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
243
244static int bot_send_write_request(struct usbg_cmd *cmd)
245{
246 struct f_uas *fu = cmd->fu;
247 struct se_cmd *se_cmd = &cmd->se_cmd;
248 int ret;
249
250 init_completion(&cmd->write_complete);
251 cmd->fu = fu;
252
253 if (!cmd->data_len) {
254 cmd->csw_code = US_BULK_STAT_PHASE;
255 return -EINVAL;
256 }
257
258 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
259 if (ret)
260 goto cleanup;
261 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
262 if (ret)
263 pr_err("%s(%d)\n", __func__, __LINE__);
264
265 wait_for_completion(&cmd->write_complete);
266 target_execute_cmd(se_cmd);
267cleanup:
268 return ret;
269}
270
271static int bot_submit_command(struct f_uas *, void *, unsigned int);
272
273static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
274{
275 struct f_uas *fu = req->context;
276 int ret;
277
278 fu->flags &= ~USBG_BOT_CMD_PEND;
279
280 if (req->status < 0)
281 return;
282
283 ret = bot_submit_command(fu, req->buf, req->actual);
284 if (ret)
285 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
286}
287
288static int bot_prepare_reqs(struct f_uas *fu)
289{
290 int ret;
291
292 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
293 if (!fu->bot_req_in)
294 goto err;
295
296 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
297 if (!fu->bot_req_out)
298 goto err_out;
299
300 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
301 if (!fu->cmd.req)
302 goto err_cmd;
303
304 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
305 if (!fu->bot_status.req)
306 goto err_sts;
307
308 fu->bot_status.req->buf = &fu->bot_status.csw;
309 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
310 fu->bot_status.req->complete = bot_status_complete;
311 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
312
313 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
314 if (!fu->cmd.buf)
315 goto err_buf;
316
317 fu->cmd.req->complete = bot_cmd_complete;
318 fu->cmd.req->buf = fu->cmd.buf;
319 fu->cmd.req->length = fu->ep_out->maxpacket;
320 fu->cmd.req->context = fu;
321
322 ret = bot_enqueue_cmd_cbw(fu);
323 if (ret)
324 goto err_queue;
325 return 0;
326err_queue:
327 kfree(fu->cmd.buf);
328 fu->cmd.buf = NULL;
329err_buf:
330 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
331err_sts:
332 usb_ep_free_request(fu->ep_out, fu->cmd.req);
333 fu->cmd.req = NULL;
334err_cmd:
335 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
336 fu->bot_req_out = NULL;
337err_out:
338 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
339 fu->bot_req_in = NULL;
340err:
341 pr_err("BOT: endpoint setup failed\n");
342 return -ENOMEM;
343}
344
345static void bot_cleanup_old_alt(struct f_uas *fu)
346{
347 if (!(fu->flags & USBG_ENABLED))
348 return;
349
350 usb_ep_disable(fu->ep_in);
351 usb_ep_disable(fu->ep_out);
352
353 if (!fu->bot_req_in)
354 return;
355
356 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
357 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
358 usb_ep_free_request(fu->ep_out, fu->cmd.req);
359 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
360
361 kfree(fu->cmd.buf);
362
363 fu->bot_req_in = NULL;
364 fu->bot_req_out = NULL;
365 fu->cmd.req = NULL;
366 fu->bot_status.req = NULL;
367 fu->cmd.buf = NULL;
368}
369
370static void bot_set_alt(struct f_uas *fu)
371{
372 struct usb_function *f = &fu->function;
373 struct usb_gadget *gadget = f->config->cdev->gadget;
374 int ret;
375
376 fu->flags = USBG_IS_BOT;
377
378 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB);
379 ret = usb_ep_enable(fu->ep_in);
380 if (ret)
381 goto err_b_in;
382
383 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB);
384 ret = usb_ep_enable(fu->ep_out);
385 if (ret)
386 goto err_b_out;
387
388 ret = bot_prepare_reqs(fu);
389 if (ret)
390 goto err_wq;
391 fu->flags |= USBG_ENABLED;
392 pr_info("Using the BOT protocol\n");
393 return;
394err_wq:
395 usb_ep_disable(fu->ep_out);
396err_b_out:
397 usb_ep_disable(fu->ep_in);
398err_b_in:
399 fu->flags = USBG_IS_BOT;
400}
401
402static int usbg_bot_setup(struct usb_function *f,
403 const struct usb_ctrlrequest *ctrl)
404{
405 struct f_uas *fu = to_f_uas(f);
406 struct usb_composite_dev *cdev = f->config->cdev;
407 u16 w_value = le16_to_cpu(ctrl->wValue);
408 u16 w_length = le16_to_cpu(ctrl->wLength);
409 int luns;
410 u8 *ret_lun;
411
412 switch (ctrl->bRequest) {
413 case US_BULK_GET_MAX_LUN:
414 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
415 USB_RECIP_INTERFACE))
416 return -ENOTSUPP;
417
418 if (w_length < 1)
419 return -EINVAL;
420 if (w_value != 0)
421 return -EINVAL;
422 luns = atomic_read(&fu->tpg->tpg_port_count);
423 if (!luns) {
424 pr_err("No LUNs configured?\n");
425 return -EINVAL;
426 }
427 /*
428 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
429 * accessed. The upper limit is 0xf
430 */
431 luns--;
432 if (luns > 0xf) {
433 pr_info_once("Limiting the number of luns to 16\n");
434 luns = 0xf;
435 }
436 ret_lun = cdev->req->buf;
437 *ret_lun = luns;
438 cdev->req->length = 1;
439 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
440
441 case US_BULK_RESET_REQUEST:
442 /* XXX maybe we should remove previous requests for IN + OUT */
443 bot_enqueue_cmd_cbw(fu);
444 return 0;
445 }
446 return -ENOTSUPP;
447}
448
449/* Start uas.c code */
450
451static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
452{
453 /* We have either all three allocated or none */
454 if (!stream->req_in)
455 return;
456
457 usb_ep_free_request(fu->ep_in, stream->req_in);
458 usb_ep_free_request(fu->ep_out, stream->req_out);
459 usb_ep_free_request(fu->ep_status, stream->req_status);
460
461 stream->req_in = NULL;
462 stream->req_out = NULL;
463 stream->req_status = NULL;
464}
465
466static void uasp_free_cmdreq(struct f_uas *fu)
467{
468 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
469 kfree(fu->cmd.buf);
470 fu->cmd.req = NULL;
471 fu->cmd.buf = NULL;
472}
473
474static void uasp_cleanup_old_alt(struct f_uas *fu)
475{
476 int i;
477
478 if (!(fu->flags & USBG_ENABLED))
479 return;
480
481 usb_ep_disable(fu->ep_in);
482 usb_ep_disable(fu->ep_out);
483 usb_ep_disable(fu->ep_status);
484 usb_ep_disable(fu->ep_cmd);
485
486 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
487 uasp_cleanup_one_stream(fu, &fu->stream[i]);
488 uasp_free_cmdreq(fu);
489}
490
491static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
492
493static int uasp_prepare_r_request(struct usbg_cmd *cmd)
494{
495 struct se_cmd *se_cmd = &cmd->se_cmd;
496 struct f_uas *fu = cmd->fu;
497 struct usb_gadget *gadget = fuas_to_gadget(fu);
498 struct uas_stream *stream = cmd->stream;
499
500 if (!gadget->sg_supported) {
501 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
502 if (!cmd->data_buf)
503 return -ENOMEM;
504
505 sg_copy_to_buffer(se_cmd->t_data_sg,
506 se_cmd->t_data_nents,
507 cmd->data_buf,
508 se_cmd->data_length);
509
510 stream->req_in->buf = cmd->data_buf;
511 } else {
512 stream->req_in->buf = NULL;
513 stream->req_in->num_sgs = se_cmd->t_data_nents;
514 stream->req_in->sg = se_cmd->t_data_sg;
515 }
516
517 stream->req_in->is_last = 1;
518 stream->req_in->complete = uasp_status_data_cmpl;
519 stream->req_in->length = se_cmd->data_length;
520 stream->req_in->context = cmd;
521
522 cmd->state = UASP_SEND_STATUS;
523 return 0;
524}
525
526static void uasp_prepare_status(struct usbg_cmd *cmd)
527{
528 struct se_cmd *se_cmd = &cmd->se_cmd;
529 struct sense_iu *iu = &cmd->sense_iu;
530 struct uas_stream *stream = cmd->stream;
531
532 cmd->state = UASP_QUEUE_COMMAND;
533 iu->iu_id = IU_ID_STATUS;
534 iu->tag = cpu_to_be16(cmd->tag);
535
536 /*
537 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
538 */
539 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
540 iu->status = se_cmd->scsi_status;
541 stream->req_status->is_last = 1;
542 stream->req_status->context = cmd;
543 stream->req_status->length = se_cmd->scsi_sense_length + 16;
544 stream->req_status->buf = iu;
545 stream->req_status->complete = uasp_status_data_cmpl;
546}
547
548static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
549{
550 struct usbg_cmd *cmd = req->context;
551 struct uas_stream *stream = cmd->stream;
552 struct f_uas *fu = cmd->fu;
553 int ret;
554
555 if (req->status < 0)
556 goto cleanup;
557
558 switch (cmd->state) {
559 case UASP_SEND_DATA:
560 ret = uasp_prepare_r_request(cmd);
561 if (ret)
562 goto cleanup;
563 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
564 if (ret)
565 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
566 break;
567
568 case UASP_RECEIVE_DATA:
569 ret = usbg_prepare_w_request(cmd, stream->req_out);
570 if (ret)
571 goto cleanup;
572 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
573 if (ret)
574 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
575 break;
576
577 case UASP_SEND_STATUS:
578 uasp_prepare_status(cmd);
579 ret = usb_ep_queue(fu->ep_status, stream->req_status,
580 GFP_ATOMIC);
581 if (ret)
582 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
583 break;
584
585 case UASP_QUEUE_COMMAND:
586 transport_generic_free_cmd(&cmd->se_cmd, 0);
587 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
588 break;
589
590 default:
591 BUG();
592 }
593 return;
594
595cleanup:
596 transport_generic_free_cmd(&cmd->se_cmd, 0);
597}
598
599static int uasp_send_status_response(struct usbg_cmd *cmd)
600{
601 struct f_uas *fu = cmd->fu;
602 struct uas_stream *stream = cmd->stream;
603 struct sense_iu *iu = &cmd->sense_iu;
604
605 iu->tag = cpu_to_be16(cmd->tag);
606 stream->req_status->complete = uasp_status_data_cmpl;
607 stream->req_status->context = cmd;
608 cmd->fu = fu;
609 uasp_prepare_status(cmd);
610 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
611}
612
613static int uasp_send_read_response(struct usbg_cmd *cmd)
614{
615 struct f_uas *fu = cmd->fu;
616 struct uas_stream *stream = cmd->stream;
617 struct sense_iu *iu = &cmd->sense_iu;
618 int ret;
619
620 cmd->fu = fu;
621
622 iu->tag = cpu_to_be16(cmd->tag);
623 if (fu->flags & USBG_USE_STREAMS) {
624
625 ret = uasp_prepare_r_request(cmd);
626 if (ret)
627 goto out;
628 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
629 if (ret) {
630 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
631 kfree(cmd->data_buf);
632 cmd->data_buf = NULL;
633 }
634
635 } else {
636
637 iu->iu_id = IU_ID_READ_READY;
638 iu->tag = cpu_to_be16(cmd->tag);
639
640 stream->req_status->complete = uasp_status_data_cmpl;
641 stream->req_status->context = cmd;
642
643 cmd->state = UASP_SEND_DATA;
644 stream->req_status->buf = iu;
645 stream->req_status->length = sizeof(struct iu);
646
647 ret = usb_ep_queue(fu->ep_status, stream->req_status,
648 GFP_ATOMIC);
649 if (ret)
650 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
651 }
652out:
653 return ret;
654}
655
656static int uasp_send_write_request(struct usbg_cmd *cmd)
657{
658 struct f_uas *fu = cmd->fu;
659 struct se_cmd *se_cmd = &cmd->se_cmd;
660 struct uas_stream *stream = cmd->stream;
661 struct sense_iu *iu = &cmd->sense_iu;
662 int ret;
663
664 init_completion(&cmd->write_complete);
665 cmd->fu = fu;
666
667 iu->tag = cpu_to_be16(cmd->tag);
668
669 if (fu->flags & USBG_USE_STREAMS) {
670
671 ret = usbg_prepare_w_request(cmd, stream->req_out);
672 if (ret)
673 goto cleanup;
674 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
675 if (ret)
676 pr_err("%s(%d)\n", __func__, __LINE__);
677
678 } else {
679
680 iu->iu_id = IU_ID_WRITE_READY;
681 iu->tag = cpu_to_be16(cmd->tag);
682
683 stream->req_status->complete = uasp_status_data_cmpl;
684 stream->req_status->context = cmd;
685
686 cmd->state = UASP_RECEIVE_DATA;
687 stream->req_status->buf = iu;
688 stream->req_status->length = sizeof(struct iu);
689
690 ret = usb_ep_queue(fu->ep_status, stream->req_status,
691 GFP_ATOMIC);
692 if (ret)
693 pr_err("%s(%d)\n", __func__, __LINE__);
694 }
695
696 wait_for_completion(&cmd->write_complete);
697 target_execute_cmd(se_cmd);
698cleanup:
699 return ret;
700}
701
702static int usbg_submit_command(struct f_uas *, void *, unsigned int);
703
704static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
705{
706 struct f_uas *fu = req->context;
707 int ret;
708
709 if (req->status < 0)
710 return;
711
712 ret = usbg_submit_command(fu, req->buf, req->actual);
713 /*
714 * Once we tune for performance enqueue the command req here again so
715 * we can receive a second command while we processing this one. Pay
716 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
717 * don't break HS.
718 */
719 if (!ret)
720 return;
721 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
722}
723
724static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
725{
726 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
727 if (!stream->req_in)
728 goto out;
729
730 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
731 if (!stream->req_out)
732 goto err_out;
733
734 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
735 if (!stream->req_status)
736 goto err_sts;
737
738 return 0;
739
740err_sts:
741 usb_ep_free_request(fu->ep_out, stream->req_out);
742 stream->req_out = NULL;
743err_out:
744 usb_ep_free_request(fu->ep_in, stream->req_in);
745 stream->req_in = NULL;
746out:
747 return -ENOMEM;
748}
749
750static int uasp_alloc_cmd(struct f_uas *fu)
751{
752 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
753 if (!fu->cmd.req)
754 goto err;
755
756 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
757 if (!fu->cmd.buf)
758 goto err_buf;
759
760 fu->cmd.req->complete = uasp_cmd_complete;
761 fu->cmd.req->buf = fu->cmd.buf;
762 fu->cmd.req->length = fu->ep_cmd->maxpacket;
763 fu->cmd.req->context = fu;
764 return 0;
765
766err_buf:
767 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
768err:
769 return -ENOMEM;
770}
771
772static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
773{
774 int i;
775
776 for (i = 0; i < max_streams; i++) {
777 struct uas_stream *s = &fu->stream[i];
778
779 s->req_in->stream_id = i + 1;
780 s->req_out->stream_id = i + 1;
781 s->req_status->stream_id = i + 1;
782 }
783}
784
785static int uasp_prepare_reqs(struct f_uas *fu)
786{
787 int ret;
788 int i;
789 int max_streams;
790
791 if (fu->flags & USBG_USE_STREAMS)
792 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
793 else
794 max_streams = 1;
795
796 for (i = 0; i < max_streams; i++) {
797 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
798 if (ret)
799 goto err_cleanup;
800 }
801
802 ret = uasp_alloc_cmd(fu);
803 if (ret)
804 goto err_free_stream;
805 uasp_setup_stream_res(fu, max_streams);
806
807 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
808 if (ret)
809 goto err_free_stream;
810
811 return 0;
812
813err_free_stream:
814 uasp_free_cmdreq(fu);
815
816err_cleanup:
817 if (i) {
818 do {
819 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
820 i--;
821 } while (i);
822 }
823 pr_err("UASP: endpoint setup failed\n");
824 return ret;
825}
826
827static void uasp_set_alt(struct f_uas *fu)
828{
829 struct usb_function *f = &fu->function;
830 struct usb_gadget *gadget = f->config->cdev->gadget;
831 int ret;
832
833 fu->flags = USBG_IS_UAS;
834
835 if (gadget->speed >= USB_SPEED_SUPER)
836 fu->flags |= USBG_USE_STREAMS;
837
838 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS);
839 ret = usb_ep_enable(fu->ep_in);
840 if (ret)
841 goto err_b_in;
842
843 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS);
844 ret = usb_ep_enable(fu->ep_out);
845 if (ret)
846 goto err_b_out;
847
848 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS);
849 ret = usb_ep_enable(fu->ep_cmd);
850 if (ret)
851 goto err_cmd;
852 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS);
853 ret = usb_ep_enable(fu->ep_status);
854 if (ret)
855 goto err_status;
856
857 ret = uasp_prepare_reqs(fu);
858 if (ret)
859 goto err_wq;
860 fu->flags |= USBG_ENABLED;
861
862 pr_info("Using the UAS protocol\n");
863 return;
864err_wq:
865 usb_ep_disable(fu->ep_status);
866err_status:
867 usb_ep_disable(fu->ep_cmd);
868err_cmd:
869 usb_ep_disable(fu->ep_out);
870err_b_out:
871 usb_ep_disable(fu->ep_in);
872err_b_in:
873 fu->flags = 0;
874}
875
876static int get_cmd_dir(const unsigned char *cdb)
877{
878 int ret;
879
880 switch (cdb[0]) {
881 case READ_6:
882 case READ_10:
883 case READ_12:
884 case READ_16:
885 case INQUIRY:
886 case MODE_SENSE:
887 case MODE_SENSE_10:
888 case SERVICE_ACTION_IN_16:
889 case MAINTENANCE_IN:
890 case PERSISTENT_RESERVE_IN:
891 case SECURITY_PROTOCOL_IN:
892 case ACCESS_CONTROL_IN:
893 case REPORT_LUNS:
894 case READ_BLOCK_LIMITS:
895 case READ_POSITION:
896 case READ_CAPACITY:
897 case READ_TOC:
898 case READ_FORMAT_CAPACITIES:
899 case REQUEST_SENSE:
900 ret = DMA_FROM_DEVICE;
901 break;
902
903 case WRITE_6:
904 case WRITE_10:
905 case WRITE_12:
906 case WRITE_16:
907 case MODE_SELECT:
908 case MODE_SELECT_10:
909 case WRITE_VERIFY:
910 case WRITE_VERIFY_12:
911 case PERSISTENT_RESERVE_OUT:
912 case MAINTENANCE_OUT:
913 case SECURITY_PROTOCOL_OUT:
914 case ACCESS_CONTROL_OUT:
915 ret = DMA_TO_DEVICE;
916 break;
917 case ALLOW_MEDIUM_REMOVAL:
918 case TEST_UNIT_READY:
919 case SYNCHRONIZE_CACHE:
920 case START_STOP:
921 case ERASE:
922 case REZERO_UNIT:
923 case SEEK_10:
924 case SPACE:
925 case VERIFY:
926 case WRITE_FILEMARKS:
927 ret = DMA_NONE;
928 break;
929 default:
930#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
931 pr_warn(CMD_DIR_MSG, cdb[0]);
932#undef CMD_DIR_MSG
933 ret = -EINVAL;
934 }
935 return ret;
936}
937
938static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
939{
940 struct usbg_cmd *cmd = req->context;
941 struct se_cmd *se_cmd = &cmd->se_cmd;
942
943 if (req->status < 0) {
944 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
945 goto cleanup;
946 }
947
948 if (req->num_sgs == 0) {
949 sg_copy_from_buffer(se_cmd->t_data_sg,
950 se_cmd->t_data_nents,
951 cmd->data_buf,
952 se_cmd->data_length);
953 }
954
955 complete(&cmd->write_complete);
956 return;
957
958cleanup:
959 target_put_sess_cmd(se_cmd);
960 transport_generic_free_cmd(&cmd->se_cmd, 0);
961}
962
963static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
964{
965 struct se_cmd *se_cmd = &cmd->se_cmd;
966 struct f_uas *fu = cmd->fu;
967 struct usb_gadget *gadget = fuas_to_gadget(fu);
968
969 if (!gadget->sg_supported) {
970 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
971 if (!cmd->data_buf)
972 return -ENOMEM;
973
974 req->buf = cmd->data_buf;
975 } else {
976 req->buf = NULL;
977 req->num_sgs = se_cmd->t_data_nents;
978 req->sg = se_cmd->t_data_sg;
979 }
980
981 req->is_last = 1;
982 req->complete = usbg_data_write_cmpl;
983 req->length = se_cmd->data_length;
984 req->context = cmd;
985 return 0;
986}
987
988static int usbg_send_status_response(struct se_cmd *se_cmd)
989{
990 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
991 se_cmd);
992 struct f_uas *fu = cmd->fu;
993
994 if (fu->flags & USBG_IS_BOT)
995 return bot_send_status_response(cmd);
996 else
997 return uasp_send_status_response(cmd);
998}
999
1000static int usbg_send_write_request(struct se_cmd *se_cmd)
1001{
1002 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1003 se_cmd);
1004 struct f_uas *fu = cmd->fu;
1005
1006 if (fu->flags & USBG_IS_BOT)
1007 return bot_send_write_request(cmd);
1008 else
1009 return uasp_send_write_request(cmd);
1010}
1011
1012static int usbg_send_read_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_read_response(cmd);
1020 else
1021 return uasp_send_read_response(cmd);
1022}
1023
1024static void usbg_cmd_work(struct work_struct *work)
1025{
1026 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1027 struct se_cmd *se_cmd;
1028 struct tcm_usbg_nexus *tv_nexus;
1029 struct usbg_tpg *tpg;
1030 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1031
1032 se_cmd = &cmd->se_cmd;
1033 tpg = cmd->fu->tpg;
1034 tv_nexus = tpg->tpg_nexus;
1035 dir = get_cmd_dir(cmd->cmd_buf);
1036 if (dir < 0) {
1037 __target_init_cmd(se_cmd,
1038 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1039 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1040 cmd->prio_attr, cmd->sense_iu.sense,
1041 cmd->unpacked_lun, NULL);
1042 goto out;
1043 }
1044
1045 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1046 cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1047 cmd->prio_attr, dir, flags);
1048 return;
1049
1050out:
1051 transport_send_check_condition_and_sense(se_cmd,
1052 TCM_UNSUPPORTED_SCSI_OPCODE, 0);
1053}
1054
1055static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1056 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1057{
1058 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1059 struct usbg_cmd *cmd;
1060 int tag, cpu;
1061
1062 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1063 if (tag < 0)
1064 return ERR_PTR(-ENOMEM);
1065
1066 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1067 memset(cmd, 0, sizeof(*cmd));
1068 cmd->se_cmd.map_tag = tag;
1069 cmd->se_cmd.map_cpu = cpu;
1070 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1071 cmd->fu = fu;
1072
1073 return cmd;
1074}
1075
1076static void usbg_release_cmd(struct se_cmd *);
1077
1078static int usbg_submit_command(struct f_uas *fu,
1079 void *cmdbuf, unsigned int len)
1080{
1081 struct command_iu *cmd_iu = cmdbuf;
1082 struct usbg_cmd *cmd;
1083 struct usbg_tpg *tpg = fu->tpg;
1084 struct tcm_usbg_nexus *tv_nexus;
1085 u32 cmd_len;
1086 u16 scsi_tag;
1087
1088 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1089 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1090 return -EINVAL;
1091 }
1092
1093 tv_nexus = tpg->tpg_nexus;
1094 if (!tv_nexus) {
1095 pr_err("Missing nexus, ignoring command\n");
1096 return -EINVAL;
1097 }
1098
1099 cmd_len = (cmd_iu->len & ~0x3) + 16;
1100 if (cmd_len > USBG_MAX_CMD)
1101 return -EINVAL;
1102
1103 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1104 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1105 if (IS_ERR(cmd)) {
1106 pr_err("usbg_get_cmd failed\n");
1107 return -ENOMEM;
1108 }
1109 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1110
1111 if (fu->flags & USBG_USE_STREAMS) {
1112 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1113 goto err;
1114 if (!cmd->tag)
1115 cmd->stream = &fu->stream[0];
1116 else
1117 cmd->stream = &fu->stream[cmd->tag - 1];
1118 } else {
1119 cmd->stream = &fu->stream[0];
1120 }
1121
1122 switch (cmd_iu->prio_attr & 0x7) {
1123 case UAS_HEAD_TAG:
1124 cmd->prio_attr = TCM_HEAD_TAG;
1125 break;
1126 case UAS_ORDERED_TAG:
1127 cmd->prio_attr = TCM_ORDERED_TAG;
1128 break;
1129 case UAS_ACA:
1130 cmd->prio_attr = TCM_ACA_TAG;
1131 break;
1132 default:
1133 pr_debug_once("Unsupported prio_attr: %02x.\n",
1134 cmd_iu->prio_attr);
1135 fallthrough;
1136 case UAS_SIMPLE_TAG:
1137 cmd->prio_attr = TCM_SIMPLE_TAG;
1138 break;
1139 }
1140
1141 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1142
1143 INIT_WORK(&cmd->work, usbg_cmd_work);
1144 queue_work(tpg->workqueue, &cmd->work);
1145
1146 return 0;
1147err:
1148 usbg_release_cmd(&cmd->se_cmd);
1149 return -EINVAL;
1150}
1151
1152static void bot_cmd_work(struct work_struct *work)
1153{
1154 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1155 struct se_cmd *se_cmd;
1156 struct tcm_usbg_nexus *tv_nexus;
1157 struct usbg_tpg *tpg;
1158 int dir;
1159
1160 se_cmd = &cmd->se_cmd;
1161 tpg = cmd->fu->tpg;
1162 tv_nexus = tpg->tpg_nexus;
1163 dir = get_cmd_dir(cmd->cmd_buf);
1164 if (dir < 0) {
1165 __target_init_cmd(se_cmd,
1166 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1167 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1168 cmd->prio_attr, cmd->sense_iu.sense,
1169 cmd->unpacked_lun, NULL);
1170 goto out;
1171 }
1172
1173 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);
1176 return;
1177
1178out:
1179 transport_send_check_condition_and_sense(se_cmd,
1180 TCM_UNSUPPORTED_SCSI_OPCODE, 0);
1181}
1182
1183static int bot_submit_command(struct f_uas *fu,
1184 void *cmdbuf, unsigned int len)
1185{
1186 struct bulk_cb_wrap *cbw = cmdbuf;
1187 struct usbg_cmd *cmd;
1188 struct usbg_tpg *tpg = fu->tpg;
1189 struct tcm_usbg_nexus *tv_nexus;
1190 u32 cmd_len;
1191
1192 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1193 pr_err("Wrong signature on CBW\n");
1194 return -EINVAL;
1195 }
1196 if (len != 31) {
1197 pr_err("Wrong length for CBW\n");
1198 return -EINVAL;
1199 }
1200
1201 cmd_len = cbw->Length;
1202 if (cmd_len < 1 || cmd_len > 16)
1203 return -EINVAL;
1204
1205 tv_nexus = tpg->tpg_nexus;
1206 if (!tv_nexus) {
1207 pr_err("Missing nexus, ignoring command\n");
1208 return -ENODEV;
1209 }
1210
1211 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1212 if (IS_ERR(cmd)) {
1213 pr_err("usbg_get_cmd failed\n");
1214 return -ENOMEM;
1215 }
1216 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1217
1218 cmd->bot_tag = cbw->Tag;
1219 cmd->prio_attr = TCM_SIMPLE_TAG;
1220 cmd->unpacked_lun = cbw->Lun;
1221 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1222 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1223 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1224
1225 INIT_WORK(&cmd->work, bot_cmd_work);
1226 queue_work(tpg->workqueue, &cmd->work);
1227
1228 return 0;
1229}
1230
1231/* Start fabric.c code */
1232
1233static int usbg_check_true(struct se_portal_group *se_tpg)
1234{
1235 return 1;
1236}
1237
1238static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1239{
1240 struct usbg_tpg *tpg = container_of(se_tpg,
1241 struct usbg_tpg, se_tpg);
1242 struct usbg_tport *tport = tpg->tport;
1243
1244 return &tport->tport_name[0];
1245}
1246
1247static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1248{
1249 struct usbg_tpg *tpg = container_of(se_tpg,
1250 struct usbg_tpg, se_tpg);
1251 return tpg->tport_tpgt;
1252}
1253
1254static void usbg_release_cmd(struct se_cmd *se_cmd)
1255{
1256 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1257 se_cmd);
1258 struct se_session *se_sess = se_cmd->se_sess;
1259
1260 kfree(cmd->data_buf);
1261 target_free_tag(se_sess, se_cmd);
1262}
1263
1264static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1265{
1266}
1267
1268static void usbg_aborted_task(struct se_cmd *se_cmd)
1269{
1270}
1271
1272static const char *usbg_check_wwn(const char *name)
1273{
1274 const char *n;
1275 unsigned int len;
1276
1277 n = strstr(name, "naa.");
1278 if (!n)
1279 return NULL;
1280 n += 4;
1281 len = strlen(n);
1282 if (len == 0 || len > USBG_NAMELEN - 1)
1283 return NULL;
1284 return n;
1285}
1286
1287static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1288{
1289 if (!usbg_check_wwn(name))
1290 return -EINVAL;
1291 return 0;
1292}
1293
1294static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1295 const char *name)
1296{
1297 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1298 tport_wwn);
1299 struct usbg_tpg *tpg;
1300 unsigned long tpgt;
1301 int ret;
1302 struct f_tcm_opts *opts;
1303 unsigned i;
1304
1305 if (strstr(name, "tpgt_") != name)
1306 return ERR_PTR(-EINVAL);
1307 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1308 return ERR_PTR(-EINVAL);
1309 ret = -ENODEV;
1310 mutex_lock(&tpg_instances_lock);
1311 for (i = 0; i < TPG_INSTANCES; ++i)
1312 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1313 break;
1314 if (i == TPG_INSTANCES)
1315 goto unlock_inst;
1316
1317 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1318 func_inst);
1319 mutex_lock(&opts->dep_lock);
1320 if (!opts->ready)
1321 goto unlock_dep;
1322
1323 if (opts->has_dep) {
1324 if (!try_module_get(opts->dependent))
1325 goto unlock_dep;
1326 } else {
1327 ret = configfs_depend_item_unlocked(
1328 wwn->wwn_group.cg_subsys,
1329 &opts->func_inst.group.cg_item);
1330 if (ret)
1331 goto unlock_dep;
1332 }
1333
1334 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1335 ret = -ENOMEM;
1336 if (!tpg)
1337 goto unref_dep;
1338 mutex_init(&tpg->tpg_mutex);
1339 atomic_set(&tpg->tpg_port_count, 0);
1340 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1341 if (!tpg->workqueue)
1342 goto free_tpg;
1343
1344 tpg->tport = tport;
1345 tpg->tport_tpgt = tpgt;
1346
1347 /*
1348 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1349 * pretend to be SAS..
1350 */
1351 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1352 if (ret < 0)
1353 goto free_workqueue;
1354
1355 tpg_instances[i].tpg = tpg;
1356 tpg->fi = tpg_instances[i].func_inst;
1357 mutex_unlock(&opts->dep_lock);
1358 mutex_unlock(&tpg_instances_lock);
1359 return &tpg->se_tpg;
1360
1361free_workqueue:
1362 destroy_workqueue(tpg->workqueue);
1363free_tpg:
1364 kfree(tpg);
1365unref_dep:
1366 if (opts->has_dep)
1367 module_put(opts->dependent);
1368 else
1369 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1370unlock_dep:
1371 mutex_unlock(&opts->dep_lock);
1372unlock_inst:
1373 mutex_unlock(&tpg_instances_lock);
1374
1375 return ERR_PTR(ret);
1376}
1377
1378static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1379
1380static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1381{
1382 struct usbg_tpg *tpg = container_of(se_tpg,
1383 struct usbg_tpg, se_tpg);
1384 unsigned i;
1385 struct f_tcm_opts *opts;
1386
1387 tcm_usbg_drop_nexus(tpg);
1388 core_tpg_deregister(se_tpg);
1389 destroy_workqueue(tpg->workqueue);
1390
1391 mutex_lock(&tpg_instances_lock);
1392 for (i = 0; i < TPG_INSTANCES; ++i)
1393 if (tpg_instances[i].tpg == tpg)
1394 break;
1395 if (i < TPG_INSTANCES) {
1396 tpg_instances[i].tpg = NULL;
1397 opts = container_of(tpg_instances[i].func_inst,
1398 struct f_tcm_opts, func_inst);
1399 mutex_lock(&opts->dep_lock);
1400 if (opts->has_dep)
1401 module_put(opts->dependent);
1402 else
1403 configfs_undepend_item_unlocked(
1404 &opts->func_inst.group.cg_item);
1405 mutex_unlock(&opts->dep_lock);
1406 }
1407 mutex_unlock(&tpg_instances_lock);
1408
1409 kfree(tpg);
1410}
1411
1412static struct se_wwn *usbg_make_tport(
1413 struct target_fabric_configfs *tf,
1414 struct config_group *group,
1415 const char *name)
1416{
1417 struct usbg_tport *tport;
1418 const char *wnn_name;
1419 u64 wwpn = 0;
1420
1421 wnn_name = usbg_check_wwn(name);
1422 if (!wnn_name)
1423 return ERR_PTR(-EINVAL);
1424
1425 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1426 if (!(tport))
1427 return ERR_PTR(-ENOMEM);
1428
1429 tport->tport_wwpn = wwpn;
1430 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1431 return &tport->tport_wwn;
1432}
1433
1434static void usbg_drop_tport(struct se_wwn *wwn)
1435{
1436 struct usbg_tport *tport = container_of(wwn,
1437 struct usbg_tport, tport_wwn);
1438 kfree(tport);
1439}
1440
1441/*
1442 * If somebody feels like dropping the version property, go ahead.
1443 */
1444static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1445{
1446 return sprintf(page, "usb-gadget fabric module\n");
1447}
1448
1449CONFIGFS_ATTR_RO(usbg_wwn_, version);
1450
1451static struct configfs_attribute *usbg_wwn_attrs[] = {
1452 &usbg_wwn_attr_version,
1453 NULL,
1454};
1455
1456static int usbg_attach(struct usbg_tpg *);
1457static void usbg_detach(struct usbg_tpg *);
1458
1459static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable)
1460{
1461 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1462 int ret = 0;
1463
1464 if (enable)
1465 ret = usbg_attach(tpg);
1466 else
1467 usbg_detach(tpg);
1468 if (ret)
1469 return ret;
1470
1471 tpg->gadget_connect = enable;
1472
1473 return 0;
1474}
1475
1476static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1477{
1478 struct se_portal_group *se_tpg = to_tpg(item);
1479 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1480 struct tcm_usbg_nexus *tv_nexus;
1481 ssize_t ret;
1482
1483 mutex_lock(&tpg->tpg_mutex);
1484 tv_nexus = tpg->tpg_nexus;
1485 if (!tv_nexus) {
1486 ret = -ENODEV;
1487 goto out;
1488 }
1489 ret = sysfs_emit(page, "%s\n",
1490 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1491out:
1492 mutex_unlock(&tpg->tpg_mutex);
1493 return ret;
1494}
1495
1496static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1497 struct se_session *se_sess, void *p)
1498{
1499 struct usbg_tpg *tpg = container_of(se_tpg,
1500 struct usbg_tpg, se_tpg);
1501
1502 tpg->tpg_nexus = p;
1503 return 0;
1504}
1505
1506static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1507{
1508 struct tcm_usbg_nexus *tv_nexus;
1509 int ret = 0;
1510
1511 mutex_lock(&tpg->tpg_mutex);
1512 if (tpg->tpg_nexus) {
1513 ret = -EEXIST;
1514 pr_debug("tpg->tpg_nexus already exists\n");
1515 goto out_unlock;
1516 }
1517
1518 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1519 if (!tv_nexus) {
1520 ret = -ENOMEM;
1521 goto out_unlock;
1522 }
1523
1524 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1525 USB_G_DEFAULT_SESSION_TAGS,
1526 sizeof(struct usbg_cmd),
1527 TARGET_PROT_NORMAL, name,
1528 tv_nexus, usbg_alloc_sess_cb);
1529 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1530#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1531 pr_debug(MAKE_NEXUS_MSG, name);
1532#undef MAKE_NEXUS_MSG
1533 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1534 kfree(tv_nexus);
1535 }
1536
1537out_unlock:
1538 mutex_unlock(&tpg->tpg_mutex);
1539 return ret;
1540}
1541
1542static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1543{
1544 struct se_session *se_sess;
1545 struct tcm_usbg_nexus *tv_nexus;
1546 int ret = -ENODEV;
1547
1548 mutex_lock(&tpg->tpg_mutex);
1549 tv_nexus = tpg->tpg_nexus;
1550 if (!tv_nexus)
1551 goto out;
1552
1553 se_sess = tv_nexus->tvn_se_sess;
1554 if (!se_sess)
1555 goto out;
1556
1557 if (atomic_read(&tpg->tpg_port_count)) {
1558 ret = -EPERM;
1559#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1560 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1561#undef MSG
1562 goto out;
1563 }
1564
1565 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1566 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1567 /*
1568 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1569 */
1570 target_remove_session(se_sess);
1571 tpg->tpg_nexus = NULL;
1572
1573 kfree(tv_nexus);
1574 ret = 0;
1575out:
1576 mutex_unlock(&tpg->tpg_mutex);
1577 return ret;
1578}
1579
1580static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1581 const char *page, size_t count)
1582{
1583 struct se_portal_group *se_tpg = to_tpg(item);
1584 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1585 unsigned char i_port[USBG_NAMELEN], *ptr;
1586 int ret;
1587
1588 if (!strncmp(page, "NULL", 4)) {
1589 ret = tcm_usbg_drop_nexus(tpg);
1590 return (!ret) ? count : ret;
1591 }
1592 if (strlen(page) >= USBG_NAMELEN) {
1593
1594#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1595 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1596#undef NEXUS_STORE_MSG
1597 return -EINVAL;
1598 }
1599 snprintf(i_port, USBG_NAMELEN, "%s", page);
1600
1601 ptr = strstr(i_port, "naa.");
1602 if (!ptr) {
1603 pr_err("Missing 'naa.' prefix\n");
1604 return -EINVAL;
1605 }
1606
1607 if (i_port[strlen(i_port) - 1] == '\n')
1608 i_port[strlen(i_port) - 1] = '\0';
1609
1610 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1611 if (ret < 0)
1612 return ret;
1613 return count;
1614}
1615
1616CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1617
1618static struct configfs_attribute *usbg_base_attrs[] = {
1619 &tcm_usbg_tpg_attr_nexus,
1620 NULL,
1621};
1622
1623static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1624{
1625 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1626
1627 atomic_inc(&tpg->tpg_port_count);
1628 smp_mb__after_atomic();
1629 return 0;
1630}
1631
1632static void usbg_port_unlink(struct se_portal_group *se_tpg,
1633 struct se_lun *se_lun)
1634{
1635 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1636
1637 atomic_dec(&tpg->tpg_port_count);
1638 smp_mb__after_atomic();
1639}
1640
1641static int usbg_check_stop_free(struct se_cmd *se_cmd)
1642{
1643 return target_put_sess_cmd(se_cmd);
1644}
1645
1646static const struct target_core_fabric_ops usbg_ops = {
1647 .module = THIS_MODULE,
1648 .fabric_name = "usb_gadget",
1649 .tpg_get_wwn = usbg_get_fabric_wwn,
1650 .tpg_get_tag = usbg_get_tag,
1651 .tpg_check_demo_mode = usbg_check_true,
1652 .release_cmd = usbg_release_cmd,
1653 .sess_get_initiator_sid = NULL,
1654 .write_pending = usbg_send_write_request,
1655 .queue_data_in = usbg_send_read_response,
1656 .queue_status = usbg_send_status_response,
1657 .queue_tm_rsp = usbg_queue_tm_rsp,
1658 .aborted_task = usbg_aborted_task,
1659 .check_stop_free = usbg_check_stop_free,
1660
1661 .fabric_make_wwn = usbg_make_tport,
1662 .fabric_drop_wwn = usbg_drop_tport,
1663 .fabric_make_tpg = usbg_make_tpg,
1664 .fabric_enable_tpg = usbg_enable_tpg,
1665 .fabric_drop_tpg = usbg_drop_tpg,
1666 .fabric_post_link = usbg_port_link,
1667 .fabric_pre_unlink = usbg_port_unlink,
1668 .fabric_init_nodeacl = usbg_init_nodeacl,
1669
1670 .tfc_wwn_attrs = usbg_wwn_attrs,
1671 .tfc_tpg_base_attrs = usbg_base_attrs,
1672
1673 .default_submit_type = TARGET_DIRECT_SUBMIT,
1674 .direct_submit_supp = 1,
1675};
1676
1677/* Start gadget.c code */
1678
1679static struct usb_interface_descriptor bot_intf_desc = {
1680 .bLength = sizeof(bot_intf_desc),
1681 .bDescriptorType = USB_DT_INTERFACE,
1682 .bNumEndpoints = 2,
1683 .bAlternateSetting = USB_G_ALT_INT_BBB,
1684 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1685 .bInterfaceSubClass = USB_SC_SCSI,
1686 .bInterfaceProtocol = USB_PR_BULK,
1687};
1688
1689static struct usb_interface_descriptor uasp_intf_desc = {
1690 .bLength = sizeof(uasp_intf_desc),
1691 .bDescriptorType = USB_DT_INTERFACE,
1692 .bNumEndpoints = 4,
1693 .bAlternateSetting = USB_G_ALT_INT_UAS,
1694 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1695 .bInterfaceSubClass = USB_SC_SCSI,
1696 .bInterfaceProtocol = USB_PR_UAS,
1697};
1698
1699static struct usb_endpoint_descriptor uasp_bi_desc = {
1700 .bLength = USB_DT_ENDPOINT_SIZE,
1701 .bDescriptorType = USB_DT_ENDPOINT,
1702 .bEndpointAddress = USB_DIR_IN,
1703 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1704 .wMaxPacketSize = cpu_to_le16(512),
1705};
1706
1707static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1708 .bLength = USB_DT_ENDPOINT_SIZE,
1709 .bDescriptorType = USB_DT_ENDPOINT,
1710 .bEndpointAddress = USB_DIR_IN,
1711 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1712};
1713
1714static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1715 .bLength = sizeof(uasp_bi_pipe_desc),
1716 .bDescriptorType = USB_DT_PIPE_USAGE,
1717 .bPipeID = DATA_IN_PIPE_ID,
1718};
1719
1720static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1721 .bLength = USB_DT_ENDPOINT_SIZE,
1722 .bDescriptorType = USB_DT_ENDPOINT,
1723 .bEndpointAddress = USB_DIR_IN,
1724 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1725 .wMaxPacketSize = cpu_to_le16(1024),
1726};
1727
1728static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1729 .bLength = sizeof(uasp_bi_ep_comp_desc),
1730 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1731 .bMaxBurst = 0,
1732 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1733 .wBytesPerInterval = 0,
1734};
1735
1736static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1737 .bLength = sizeof(bot_bi_ep_comp_desc),
1738 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1739 .bMaxBurst = 0,
1740};
1741
1742static struct usb_endpoint_descriptor uasp_bo_desc = {
1743 .bLength = USB_DT_ENDPOINT_SIZE,
1744 .bDescriptorType = USB_DT_ENDPOINT,
1745 .bEndpointAddress = USB_DIR_OUT,
1746 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1747 .wMaxPacketSize = cpu_to_le16(512),
1748};
1749
1750static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1751 .bLength = USB_DT_ENDPOINT_SIZE,
1752 .bDescriptorType = USB_DT_ENDPOINT,
1753 .bEndpointAddress = USB_DIR_OUT,
1754 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1755};
1756
1757static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1758 .bLength = sizeof(uasp_bo_pipe_desc),
1759 .bDescriptorType = USB_DT_PIPE_USAGE,
1760 .bPipeID = DATA_OUT_PIPE_ID,
1761};
1762
1763static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1764 .bLength = USB_DT_ENDPOINT_SIZE,
1765 .bDescriptorType = USB_DT_ENDPOINT,
1766 .bEndpointAddress = USB_DIR_OUT,
1767 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1768 .wMaxPacketSize = cpu_to_le16(0x400),
1769};
1770
1771static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1772 .bLength = sizeof(uasp_bo_ep_comp_desc),
1773 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1774 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1775};
1776
1777static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1778 .bLength = sizeof(bot_bo_ep_comp_desc),
1779 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1780};
1781
1782static struct usb_endpoint_descriptor uasp_status_desc = {
1783 .bLength = USB_DT_ENDPOINT_SIZE,
1784 .bDescriptorType = USB_DT_ENDPOINT,
1785 .bEndpointAddress = USB_DIR_IN,
1786 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1787 .wMaxPacketSize = cpu_to_le16(512),
1788};
1789
1790static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1791 .bLength = USB_DT_ENDPOINT_SIZE,
1792 .bDescriptorType = USB_DT_ENDPOINT,
1793 .bEndpointAddress = USB_DIR_IN,
1794 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1795};
1796
1797static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1798 .bLength = sizeof(uasp_status_pipe_desc),
1799 .bDescriptorType = USB_DT_PIPE_USAGE,
1800 .bPipeID = STATUS_PIPE_ID,
1801};
1802
1803static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1804 .bLength = USB_DT_ENDPOINT_SIZE,
1805 .bDescriptorType = USB_DT_ENDPOINT,
1806 .bEndpointAddress = USB_DIR_IN,
1807 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1808 .wMaxPacketSize = cpu_to_le16(1024),
1809};
1810
1811static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1812 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1813 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1814 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1815};
1816
1817static struct usb_endpoint_descriptor uasp_cmd_desc = {
1818 .bLength = USB_DT_ENDPOINT_SIZE,
1819 .bDescriptorType = USB_DT_ENDPOINT,
1820 .bEndpointAddress = USB_DIR_OUT,
1821 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1822 .wMaxPacketSize = cpu_to_le16(512),
1823};
1824
1825static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1826 .bLength = USB_DT_ENDPOINT_SIZE,
1827 .bDescriptorType = USB_DT_ENDPOINT,
1828 .bEndpointAddress = USB_DIR_OUT,
1829 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1830};
1831
1832static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1833 .bLength = sizeof(uasp_cmd_pipe_desc),
1834 .bDescriptorType = USB_DT_PIPE_USAGE,
1835 .bPipeID = CMD_PIPE_ID,
1836};
1837
1838static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1839 .bLength = USB_DT_ENDPOINT_SIZE,
1840 .bDescriptorType = USB_DT_ENDPOINT,
1841 .bEndpointAddress = USB_DIR_OUT,
1842 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1843 .wMaxPacketSize = cpu_to_le16(1024),
1844};
1845
1846static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1847 .bLength = sizeof(uasp_cmd_comp_desc),
1848 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1849};
1850
1851static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1852 (struct usb_descriptor_header *) &bot_intf_desc,
1853 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1854 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1855
1856 (struct usb_descriptor_header *) &uasp_intf_desc,
1857 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1858 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1859 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1860 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1861 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1862 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1863 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1864 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1865 NULL,
1866};
1867
1868static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1869 (struct usb_descriptor_header *) &bot_intf_desc,
1870 (struct usb_descriptor_header *) &uasp_bi_desc,
1871 (struct usb_descriptor_header *) &uasp_bo_desc,
1872
1873 (struct usb_descriptor_header *) &uasp_intf_desc,
1874 (struct usb_descriptor_header *) &uasp_bi_desc,
1875 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1876 (struct usb_descriptor_header *) &uasp_bo_desc,
1877 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1878 (struct usb_descriptor_header *) &uasp_status_desc,
1879 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1880 (struct usb_descriptor_header *) &uasp_cmd_desc,
1881 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1882 NULL,
1883};
1884
1885static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1886 (struct usb_descriptor_header *) &bot_intf_desc,
1887 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1888 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1889 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1890 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1891
1892 (struct usb_descriptor_header *) &uasp_intf_desc,
1893 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1894 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1895 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1896 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1897 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1898 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1899 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1900 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1901 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1902 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1903 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1904 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1905 NULL,
1906};
1907
1908static struct usb_string tcm_us_strings[] = {
1909 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1910 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1911 { },
1912};
1913
1914static struct usb_gadget_strings tcm_stringtab = {
1915 .language = 0x0409,
1916 .strings = tcm_us_strings,
1917};
1918
1919static struct usb_gadget_strings *tcm_strings[] = {
1920 &tcm_stringtab,
1921 NULL,
1922};
1923
1924static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1925{
1926 struct f_uas *fu = to_f_uas(f);
1927 struct usb_string *us;
1928 struct usb_gadget *gadget = c->cdev->gadget;
1929 struct usb_ep *ep;
1930 struct f_tcm_opts *opts;
1931 int iface;
1932 int ret;
1933
1934 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
1935
1936 mutex_lock(&opts->dep_lock);
1937 if (!opts->can_attach) {
1938 mutex_unlock(&opts->dep_lock);
1939 return -ENODEV;
1940 }
1941 mutex_unlock(&opts->dep_lock);
1942 us = usb_gstrings_attach(c->cdev, tcm_strings,
1943 ARRAY_SIZE(tcm_us_strings));
1944 if (IS_ERR(us))
1945 return PTR_ERR(us);
1946 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
1947 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
1948
1949 iface = usb_interface_id(c, f);
1950 if (iface < 0)
1951 return iface;
1952
1953 bot_intf_desc.bInterfaceNumber = iface;
1954 uasp_intf_desc.bInterfaceNumber = iface;
1955 fu->iface = iface;
1956 ep = usb_ep_autoconfig(gadget, &uasp_fs_bi_desc);
1957 if (!ep)
1958 goto ep_fail;
1959
1960 fu->ep_in = ep;
1961
1962 ep = usb_ep_autoconfig(gadget, &uasp_fs_bo_desc);
1963 if (!ep)
1964 goto ep_fail;
1965 fu->ep_out = ep;
1966
1967 ep = usb_ep_autoconfig(gadget, &uasp_fs_status_desc);
1968 if (!ep)
1969 goto ep_fail;
1970 fu->ep_status = ep;
1971
1972 ep = usb_ep_autoconfig(gadget, &uasp_fs_cmd_desc);
1973 if (!ep)
1974 goto ep_fail;
1975 fu->ep_cmd = ep;
1976
1977 /* Assume endpoint addresses are the same for both speeds */
1978 uasp_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress;
1979 uasp_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress;
1980 uasp_status_desc.bEndpointAddress =
1981 uasp_fs_status_desc.bEndpointAddress;
1982 uasp_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress;
1983
1984 uasp_ss_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress;
1985 uasp_ss_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress;
1986 uasp_ss_status_desc.bEndpointAddress =
1987 uasp_fs_status_desc.bEndpointAddress;
1988 uasp_ss_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress;
1989
1990 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
1991 uasp_hs_function_desc, uasp_ss_function_desc,
1992 uasp_ss_function_desc);
1993 if (ret)
1994 goto ep_fail;
1995
1996 return 0;
1997ep_fail:
1998 pr_err("Can't claim all required eps\n");
1999
2000 return -ENOTSUPP;
2001}
2002
2003struct guas_setup_wq {
2004 struct work_struct work;
2005 struct f_uas *fu;
2006 unsigned int alt;
2007};
2008
2009static void tcm_delayed_set_alt(struct work_struct *wq)
2010{
2011 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2012 work);
2013 struct f_uas *fu = work->fu;
2014 int alt = work->alt;
2015
2016 kfree(work);
2017
2018 if (fu->flags & USBG_IS_BOT)
2019 bot_cleanup_old_alt(fu);
2020 if (fu->flags & USBG_IS_UAS)
2021 uasp_cleanup_old_alt(fu);
2022
2023 if (alt == USB_G_ALT_INT_BBB)
2024 bot_set_alt(fu);
2025 else if (alt == USB_G_ALT_INT_UAS)
2026 uasp_set_alt(fu);
2027 usb_composite_setup_continue(fu->function.config->cdev);
2028}
2029
2030static int tcm_get_alt(struct usb_function *f, unsigned intf)
2031{
2032 struct f_uas *fu = to_f_uas(f);
2033
2034 if (fu->iface != intf)
2035 return -EOPNOTSUPP;
2036
2037 if (fu->flags & USBG_IS_BOT)
2038 return USB_G_ALT_INT_BBB;
2039 else if (fu->flags & USBG_IS_UAS)
2040 return USB_G_ALT_INT_UAS;
2041
2042 return -EOPNOTSUPP;
2043}
2044
2045static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2046{
2047 struct f_uas *fu = to_f_uas(f);
2048
2049 if (fu->iface != intf)
2050 return -EOPNOTSUPP;
2051
2052 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2053 struct guas_setup_wq *work;
2054
2055 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2056 if (!work)
2057 return -ENOMEM;
2058 INIT_WORK(&work->work, tcm_delayed_set_alt);
2059 work->fu = fu;
2060 work->alt = alt;
2061 schedule_work(&work->work);
2062 return USB_GADGET_DELAYED_STATUS;
2063 }
2064 return -EOPNOTSUPP;
2065}
2066
2067static void tcm_disable(struct usb_function *f)
2068{
2069 struct f_uas *fu = to_f_uas(f);
2070
2071 if (fu->flags & USBG_IS_UAS)
2072 uasp_cleanup_old_alt(fu);
2073 else if (fu->flags & USBG_IS_BOT)
2074 bot_cleanup_old_alt(fu);
2075 fu->flags = 0;
2076}
2077
2078static int tcm_setup(struct usb_function *f,
2079 const struct usb_ctrlrequest *ctrl)
2080{
2081 struct f_uas *fu = to_f_uas(f);
2082
2083 if (!(fu->flags & USBG_IS_BOT))
2084 return -EOPNOTSUPP;
2085
2086 return usbg_bot_setup(f, ctrl);
2087}
2088
2089static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2090{
2091 return container_of(to_config_group(item), struct f_tcm_opts,
2092 func_inst.group);
2093}
2094
2095static void tcm_attr_release(struct config_item *item)
2096{
2097 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2098
2099 usb_put_function_instance(&opts->func_inst);
2100}
2101
2102static struct configfs_item_operations tcm_item_ops = {
2103 .release = tcm_attr_release,
2104};
2105
2106static const struct config_item_type tcm_func_type = {
2107 .ct_item_ops = &tcm_item_ops,
2108 .ct_owner = THIS_MODULE,
2109};
2110
2111static void tcm_free_inst(struct usb_function_instance *f)
2112{
2113 struct f_tcm_opts *opts;
2114 unsigned i;
2115
2116 opts = container_of(f, struct f_tcm_opts, func_inst);
2117
2118 mutex_lock(&tpg_instances_lock);
2119 for (i = 0; i < TPG_INSTANCES; ++i)
2120 if (tpg_instances[i].func_inst == f)
2121 break;
2122 if (i < TPG_INSTANCES)
2123 tpg_instances[i].func_inst = NULL;
2124 mutex_unlock(&tpg_instances_lock);
2125
2126 kfree(opts);
2127}
2128
2129static int tcm_register_callback(struct usb_function_instance *f)
2130{
2131 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2132
2133 mutex_lock(&opts->dep_lock);
2134 opts->can_attach = true;
2135 mutex_unlock(&opts->dep_lock);
2136
2137 return 0;
2138}
2139
2140static void tcm_unregister_callback(struct usb_function_instance *f)
2141{
2142 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2143
2144 mutex_lock(&opts->dep_lock);
2145 unregister_gadget_item(opts->
2146 func_inst.group.cg_item.ci_parent->ci_parent);
2147 opts->can_attach = false;
2148 mutex_unlock(&opts->dep_lock);
2149}
2150
2151static int usbg_attach(struct usbg_tpg *tpg)
2152{
2153 struct usb_function_instance *f = tpg->fi;
2154 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2155
2156 if (opts->tcm_register_callback)
2157 return opts->tcm_register_callback(f);
2158
2159 return 0;
2160}
2161
2162static void usbg_detach(struct usbg_tpg *tpg)
2163{
2164 struct usb_function_instance *f = tpg->fi;
2165 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2166
2167 if (opts->tcm_unregister_callback)
2168 opts->tcm_unregister_callback(f);
2169}
2170
2171static int tcm_set_name(struct usb_function_instance *f, const char *name)
2172{
2173 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2174
2175 pr_debug("tcm: Activating %s\n", name);
2176
2177 mutex_lock(&opts->dep_lock);
2178 opts->ready = true;
2179 mutex_unlock(&opts->dep_lock);
2180
2181 return 0;
2182}
2183
2184static struct usb_function_instance *tcm_alloc_inst(void)
2185{
2186 struct f_tcm_opts *opts;
2187 int i;
2188
2189
2190 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2191 if (!opts)
2192 return ERR_PTR(-ENOMEM);
2193
2194 mutex_lock(&tpg_instances_lock);
2195 for (i = 0; i < TPG_INSTANCES; ++i)
2196 if (!tpg_instances[i].func_inst)
2197 break;
2198
2199 if (i == TPG_INSTANCES) {
2200 mutex_unlock(&tpg_instances_lock);
2201 kfree(opts);
2202 return ERR_PTR(-EBUSY);
2203 }
2204 tpg_instances[i].func_inst = &opts->func_inst;
2205 mutex_unlock(&tpg_instances_lock);
2206
2207 mutex_init(&opts->dep_lock);
2208 opts->func_inst.set_inst_name = tcm_set_name;
2209 opts->func_inst.free_func_inst = tcm_free_inst;
2210 opts->tcm_register_callback = tcm_register_callback;
2211 opts->tcm_unregister_callback = tcm_unregister_callback;
2212
2213 config_group_init_type_name(&opts->func_inst.group, "",
2214 &tcm_func_type);
2215
2216 return &opts->func_inst;
2217}
2218
2219static void tcm_free(struct usb_function *f)
2220{
2221 struct f_uas *tcm = to_f_uas(f);
2222
2223 kfree(tcm);
2224}
2225
2226static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2227{
2228 usb_free_all_descriptors(f);
2229}
2230
2231static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2232{
2233 struct f_uas *fu;
2234 unsigned i;
2235
2236 mutex_lock(&tpg_instances_lock);
2237 for (i = 0; i < TPG_INSTANCES; ++i)
2238 if (tpg_instances[i].func_inst == fi)
2239 break;
2240 if (i == TPG_INSTANCES) {
2241 mutex_unlock(&tpg_instances_lock);
2242 return ERR_PTR(-ENODEV);
2243 }
2244
2245 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2246 if (!fu) {
2247 mutex_unlock(&tpg_instances_lock);
2248 return ERR_PTR(-ENOMEM);
2249 }
2250
2251 fu->function.name = "Target Function";
2252 fu->function.bind = tcm_bind;
2253 fu->function.unbind = tcm_unbind;
2254 fu->function.set_alt = tcm_set_alt;
2255 fu->function.get_alt = tcm_get_alt;
2256 fu->function.setup = tcm_setup;
2257 fu->function.disable = tcm_disable;
2258 fu->function.free_func = tcm_free;
2259 fu->tpg = tpg_instances[i].tpg;
2260 mutex_unlock(&tpg_instances_lock);
2261
2262 return &fu->function;
2263}
2264
2265DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2266
2267static int __init tcm_init(void)
2268{
2269 int ret;
2270
2271 ret = usb_function_register(&tcmusb_func);
2272 if (ret)
2273 return ret;
2274
2275 ret = target_register_template(&usbg_ops);
2276 if (ret)
2277 usb_function_unregister(&tcmusb_func);
2278
2279 return ret;
2280}
2281module_init(tcm_init);
2282
2283static void __exit tcm_exit(void)
2284{
2285 target_unregister_template(&usbg_ops);
2286 usb_function_unregister(&tcmusb_func);
2287}
2288module_exit(tcm_exit);
2289
2290MODULE_DESCRIPTION("Target based USB-Gadget");
2291MODULE_LICENSE("GPL");
2292MODULE_AUTHOR("Sebastian Andrzej Siewior");