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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#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
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
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
156
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
180
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
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 struct usb_gadget *gadget = fuas_to_gadget(fu);
249 int ret;
250
251 init_completion(&cmd->write_complete);
252 cmd->fu = fu;
253
254 if (!cmd->data_len) {
255 cmd->csw_code = US_BULK_STAT_PHASE;
256 return -EINVAL;
257 }
258
259 if (!gadget->sg_supported) {
260 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
261 if (!cmd->data_buf)
262 return -ENOMEM;
263
264 fu->bot_req_out->buf = cmd->data_buf;
265 } else {
266 fu->bot_req_out->buf = NULL;
267 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
268 fu->bot_req_out->sg = se_cmd->t_data_sg;
269 }
270
271 fu->bot_req_out->complete = usbg_data_write_cmpl;
272 fu->bot_req_out->length = se_cmd->data_length;
273 fu->bot_req_out->context = cmd;
274
275 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
276 if (ret)
277 goto cleanup;
278 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
279 if (ret)
280 pr_err("%s(%d)\n", __func__, __LINE__);
281
282 wait_for_completion(&cmd->write_complete);
283 target_execute_cmd(se_cmd);
284cleanup:
285 return ret;
286}
287
288static int bot_submit_command(struct f_uas *, void *, unsigned int);
289
290static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
291{
292 struct f_uas *fu = req->context;
293 int ret;
294
295 fu->flags &= ~USBG_BOT_CMD_PEND;
296
297 if (req->status < 0)
298 return;
299
300 ret = bot_submit_command(fu, req->buf, req->actual);
301 if (ret)
302 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
303}
304
305static int bot_prepare_reqs(struct f_uas *fu)
306{
307 int ret;
308
309 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
310 if (!fu->bot_req_in)
311 goto err;
312
313 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
314 if (!fu->bot_req_out)
315 goto err_out;
316
317 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
318 if (!fu->cmd.req)
319 goto err_cmd;
320
321 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
322 if (!fu->bot_status.req)
323 goto err_sts;
324
325 fu->bot_status.req->buf = &fu->bot_status.csw;
326 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
327 fu->bot_status.req->complete = bot_status_complete;
328 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
329
330 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
331 if (!fu->cmd.buf)
332 goto err_buf;
333
334 fu->cmd.req->complete = bot_cmd_complete;
335 fu->cmd.req->buf = fu->cmd.buf;
336 fu->cmd.req->length = fu->ep_out->maxpacket;
337 fu->cmd.req->context = fu;
338
339 ret = bot_enqueue_cmd_cbw(fu);
340 if (ret)
341 goto err_queue;
342 return 0;
343err_queue:
344 kfree(fu->cmd.buf);
345 fu->cmd.buf = NULL;
346err_buf:
347 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
348err_sts:
349 usb_ep_free_request(fu->ep_out, fu->cmd.req);
350 fu->cmd.req = NULL;
351err_cmd:
352 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
353 fu->bot_req_out = NULL;
354err_out:
355 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
356 fu->bot_req_in = NULL;
357err:
358 pr_err("BOT: endpoint setup failed\n");
359 return -ENOMEM;
360}
361
362static void bot_cleanup_old_alt(struct f_uas *fu)
363{
364 if (!(fu->flags & USBG_ENABLED))
365 return;
366
367 usb_ep_disable(fu->ep_in);
368 usb_ep_disable(fu->ep_out);
369
370 if (!fu->bot_req_in)
371 return;
372
373 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
374 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
375 usb_ep_free_request(fu->ep_out, fu->cmd.req);
376 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
377
378 kfree(fu->cmd.buf);
379
380 fu->bot_req_in = NULL;
381 fu->bot_req_out = NULL;
382 fu->cmd.req = NULL;
383 fu->bot_status.req = NULL;
384 fu->cmd.buf = NULL;
385}
386
387static void bot_set_alt(struct f_uas *fu)
388{
389 struct usb_function *f = &fu->function;
390 struct usb_gadget *gadget = f->config->cdev->gadget;
391 int ret;
392
393 fu->flags = USBG_IS_BOT;
394
395 config_ep_by_speed(gadget, f, fu->ep_in);
396 ret = usb_ep_enable(fu->ep_in);
397 if (ret)
398 goto err_b_in;
399
400 config_ep_by_speed(gadget, f, fu->ep_out);
401 ret = usb_ep_enable(fu->ep_out);
402 if (ret)
403 goto err_b_out;
404
405 ret = bot_prepare_reqs(fu);
406 if (ret)
407 goto err_wq;
408 fu->flags |= USBG_ENABLED;
409 pr_info("Using the BOT protocol\n");
410 return;
411err_wq:
412 usb_ep_disable(fu->ep_out);
413err_b_out:
414 usb_ep_disable(fu->ep_in);
415err_b_in:
416 fu->flags = USBG_IS_BOT;
417}
418
419static int usbg_bot_setup(struct usb_function *f,
420 const struct usb_ctrlrequest *ctrl)
421{
422 struct f_uas *fu = to_f_uas(f);
423 struct usb_composite_dev *cdev = f->config->cdev;
424 u16 w_value = le16_to_cpu(ctrl->wValue);
425 u16 w_length = le16_to_cpu(ctrl->wLength);
426 int luns;
427 u8 *ret_lun;
428
429 switch (ctrl->bRequest) {
430 case US_BULK_GET_MAX_LUN:
431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
432 USB_RECIP_INTERFACE))
433 return -ENOTSUPP;
434
435 if (w_length < 1)
436 return -EINVAL;
437 if (w_value != 0)
438 return -EINVAL;
439 luns = atomic_read(&fu->tpg->tpg_port_count);
440 if (!luns) {
441 pr_err("No LUNs configured?\n");
442 return -EINVAL;
443 }
444
445
446
447
448 luns--;
449 if (luns > 0xf) {
450 pr_info_once("Limiting the number of luns to 16\n");
451 luns = 0xf;
452 }
453 ret_lun = cdev->req->buf;
454 *ret_lun = luns;
455 cdev->req->length = 1;
456 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
457
458 case US_BULK_RESET_REQUEST:
459
460 bot_enqueue_cmd_cbw(fu);
461 return 0;
462 }
463 return -ENOTSUPP;
464}
465
466
467
468static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
469{
470
471 if (!stream->req_in)
472 return;
473
474 usb_ep_free_request(fu->ep_in, stream->req_in);
475 usb_ep_free_request(fu->ep_out, stream->req_out);
476 usb_ep_free_request(fu->ep_status, stream->req_status);
477
478 stream->req_in = NULL;
479 stream->req_out = NULL;
480 stream->req_status = NULL;
481}
482
483static void uasp_free_cmdreq(struct f_uas *fu)
484{
485 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
486 kfree(fu->cmd.buf);
487 fu->cmd.req = NULL;
488 fu->cmd.buf = NULL;
489}
490
491static void uasp_cleanup_old_alt(struct f_uas *fu)
492{
493 int i;
494
495 if (!(fu->flags & USBG_ENABLED))
496 return;
497
498 usb_ep_disable(fu->ep_in);
499 usb_ep_disable(fu->ep_out);
500 usb_ep_disable(fu->ep_status);
501 usb_ep_disable(fu->ep_cmd);
502
503 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
504 uasp_cleanup_one_stream(fu, &fu->stream[i]);
505 uasp_free_cmdreq(fu);
506}
507
508static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
509
510static int uasp_prepare_r_request(struct usbg_cmd *cmd)
511{
512 struct se_cmd *se_cmd = &cmd->se_cmd;
513 struct f_uas *fu = cmd->fu;
514 struct usb_gadget *gadget = fuas_to_gadget(fu);
515 struct uas_stream *stream = cmd->stream;
516
517 if (!gadget->sg_supported) {
518 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
519 if (!cmd->data_buf)
520 return -ENOMEM;
521
522 sg_copy_to_buffer(se_cmd->t_data_sg,
523 se_cmd->t_data_nents,
524 cmd->data_buf,
525 se_cmd->data_length);
526
527 stream->req_in->buf = cmd->data_buf;
528 } else {
529 stream->req_in->buf = NULL;
530 stream->req_in->num_sgs = se_cmd->t_data_nents;
531 stream->req_in->sg = se_cmd->t_data_sg;
532 }
533
534 stream->req_in->is_last = 1;
535 stream->req_in->complete = uasp_status_data_cmpl;
536 stream->req_in->length = se_cmd->data_length;
537 stream->req_in->context = cmd;
538
539 cmd->state = UASP_SEND_STATUS;
540 return 0;
541}
542
543static void uasp_prepare_status(struct usbg_cmd *cmd)
544{
545 struct se_cmd *se_cmd = &cmd->se_cmd;
546 struct sense_iu *iu = &cmd->sense_iu;
547 struct uas_stream *stream = cmd->stream;
548
549 cmd->state = UASP_QUEUE_COMMAND;
550 iu->iu_id = IU_ID_STATUS;
551 iu->tag = cpu_to_be16(cmd->tag);
552
553
554
555
556 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
557 iu->status = se_cmd->scsi_status;
558 stream->req_status->is_last = 1;
559 stream->req_status->context = cmd;
560 stream->req_status->length = se_cmd->scsi_sense_length + 16;
561 stream->req_status->buf = iu;
562 stream->req_status->complete = uasp_status_data_cmpl;
563}
564
565static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
566{
567 struct usbg_cmd *cmd = req->context;
568 struct uas_stream *stream = cmd->stream;
569 struct f_uas *fu = cmd->fu;
570 int ret;
571
572 if (req->status < 0)
573 goto cleanup;
574
575 switch (cmd->state) {
576 case UASP_SEND_DATA:
577 ret = uasp_prepare_r_request(cmd);
578 if (ret)
579 goto cleanup;
580 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
581 if (ret)
582 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
583 break;
584
585 case UASP_RECEIVE_DATA:
586 ret = usbg_prepare_w_request(cmd, stream->req_out);
587 if (ret)
588 goto cleanup;
589 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
590 if (ret)
591 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
592 break;
593
594 case UASP_SEND_STATUS:
595 uasp_prepare_status(cmd);
596 ret = usb_ep_queue(fu->ep_status, stream->req_status,
597 GFP_ATOMIC);
598 if (ret)
599 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
600 break;
601
602 case UASP_QUEUE_COMMAND:
603 transport_generic_free_cmd(&cmd->se_cmd, 0);
604 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
605 break;
606
607 default:
608 BUG();
609 }
610 return;
611
612cleanup:
613 transport_generic_free_cmd(&cmd->se_cmd, 0);
614}
615
616static int uasp_send_status_response(struct usbg_cmd *cmd)
617{
618 struct f_uas *fu = cmd->fu;
619 struct uas_stream *stream = cmd->stream;
620 struct sense_iu *iu = &cmd->sense_iu;
621
622 iu->tag = cpu_to_be16(cmd->tag);
623 stream->req_status->complete = uasp_status_data_cmpl;
624 stream->req_status->context = cmd;
625 cmd->fu = fu;
626 uasp_prepare_status(cmd);
627 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
628}
629
630static int uasp_send_read_response(struct usbg_cmd *cmd)
631{
632 struct f_uas *fu = cmd->fu;
633 struct uas_stream *stream = cmd->stream;
634 struct sense_iu *iu = &cmd->sense_iu;
635 int ret;
636
637 cmd->fu = fu;
638
639 iu->tag = cpu_to_be16(cmd->tag);
640 if (fu->flags & USBG_USE_STREAMS) {
641
642 ret = uasp_prepare_r_request(cmd);
643 if (ret)
644 goto out;
645 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
646 if (ret) {
647 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
648 kfree(cmd->data_buf);
649 cmd->data_buf = NULL;
650 }
651
652 } else {
653
654 iu->iu_id = IU_ID_READ_READY;
655 iu->tag = cpu_to_be16(cmd->tag);
656
657 stream->req_status->complete = uasp_status_data_cmpl;
658 stream->req_status->context = cmd;
659
660 cmd->state = UASP_SEND_DATA;
661 stream->req_status->buf = iu;
662 stream->req_status->length = sizeof(struct iu);
663
664 ret = usb_ep_queue(fu->ep_status, stream->req_status,
665 GFP_ATOMIC);
666 if (ret)
667 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
668 }
669out:
670 return ret;
671}
672
673static int uasp_send_write_request(struct usbg_cmd *cmd)
674{
675 struct f_uas *fu = cmd->fu;
676 struct se_cmd *se_cmd = &cmd->se_cmd;
677 struct uas_stream *stream = cmd->stream;
678 struct sense_iu *iu = &cmd->sense_iu;
679 int ret;
680
681 init_completion(&cmd->write_complete);
682 cmd->fu = fu;
683
684 iu->tag = cpu_to_be16(cmd->tag);
685
686 if (fu->flags & USBG_USE_STREAMS) {
687
688 ret = usbg_prepare_w_request(cmd, stream->req_out);
689 if (ret)
690 goto cleanup;
691 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
692 if (ret)
693 pr_err("%s(%d)\n", __func__, __LINE__);
694
695 } else {
696
697 iu->iu_id = IU_ID_WRITE_READY;
698 iu->tag = cpu_to_be16(cmd->tag);
699
700 stream->req_status->complete = uasp_status_data_cmpl;
701 stream->req_status->context = cmd;
702
703 cmd->state = UASP_RECEIVE_DATA;
704 stream->req_status->buf = iu;
705 stream->req_status->length = sizeof(struct iu);
706
707 ret = usb_ep_queue(fu->ep_status, stream->req_status,
708 GFP_ATOMIC);
709 if (ret)
710 pr_err("%s(%d)\n", __func__, __LINE__);
711 }
712
713 wait_for_completion(&cmd->write_complete);
714 target_execute_cmd(se_cmd);
715cleanup:
716 return ret;
717}
718
719static int usbg_submit_command(struct f_uas *, void *, unsigned int);
720
721static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
722{
723 struct f_uas *fu = req->context;
724 int ret;
725
726 if (req->status < 0)
727 return;
728
729 ret = usbg_submit_command(fu, req->buf, req->actual);
730
731
732
733
734
735
736 if (!ret)
737 return;
738 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
739}
740
741static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
742{
743 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
744 if (!stream->req_in)
745 goto out;
746
747 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
748 if (!stream->req_out)
749 goto err_out;
750
751 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
752 if (!stream->req_status)
753 goto err_sts;
754
755 return 0;
756
757err_sts:
758 usb_ep_free_request(fu->ep_out, stream->req_out);
759 stream->req_out = NULL;
760err_out:
761 usb_ep_free_request(fu->ep_in, stream->req_in);
762 stream->req_in = 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 transport_generic_free_cmd(&cmd->se_cmd, 0);
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->is_last = 1;
998 req->complete = usbg_data_write_cmpl;
999 req->length = se_cmd->data_length;
1000 req->context = cmd;
1001 return 0;
1002}
1003
1004static int usbg_send_status_response(struct se_cmd *se_cmd)
1005{
1006 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1007 se_cmd);
1008 struct f_uas *fu = cmd->fu;
1009
1010 if (fu->flags & USBG_IS_BOT)
1011 return bot_send_status_response(cmd);
1012 else
1013 return uasp_send_status_response(cmd);
1014}
1015
1016static int usbg_send_write_request(struct se_cmd *se_cmd)
1017{
1018 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1019 se_cmd);
1020 struct f_uas *fu = cmd->fu;
1021
1022 if (fu->flags & USBG_IS_BOT)
1023 return bot_send_write_request(cmd);
1024 else
1025 return uasp_send_write_request(cmd);
1026}
1027
1028static int usbg_send_read_response(struct se_cmd *se_cmd)
1029{
1030 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1031 se_cmd);
1032 struct f_uas *fu = cmd->fu;
1033
1034 if (fu->flags & USBG_IS_BOT)
1035 return bot_send_read_response(cmd);
1036 else
1037 return uasp_send_read_response(cmd);
1038}
1039
1040static void usbg_cmd_work(struct work_struct *work)
1041{
1042 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1043 struct se_cmd *se_cmd;
1044 struct tcm_usbg_nexus *tv_nexus;
1045 struct usbg_tpg *tpg;
1046 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1047
1048 se_cmd = &cmd->se_cmd;
1049 tpg = cmd->fu->tpg;
1050 tv_nexus = tpg->tpg_nexus;
1051 dir = get_cmd_dir(cmd->cmd_buf);
1052 if (dir < 0) {
1053 transport_init_se_cmd(se_cmd,
1054 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1055 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1056 cmd->prio_attr, cmd->sense_iu.sense,
1057 cmd->unpacked_lun);
1058 goto out;
1059 }
1060
1061 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1062 cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1063 cmd->prio_attr, dir, flags) < 0)
1064 goto out;
1065
1066 return;
1067
1068out:
1069 transport_send_check_condition_and_sense(se_cmd,
1070 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1071 transport_generic_free_cmd(&cmd->se_cmd, 0);
1072}
1073
1074static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1075 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1076{
1077 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1078 struct usbg_cmd *cmd;
1079 int tag, cpu;
1080
1081 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1082 if (tag < 0)
1083 return ERR_PTR(-ENOMEM);
1084
1085 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1086 memset(cmd, 0, sizeof(*cmd));
1087 cmd->se_cmd.map_tag = tag;
1088 cmd->se_cmd.map_cpu = cpu;
1089 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1090 cmd->fu = fu;
1091
1092 return cmd;
1093}
1094
1095static void usbg_release_cmd(struct se_cmd *);
1096
1097static int usbg_submit_command(struct f_uas *fu,
1098 void *cmdbuf, unsigned int len)
1099{
1100 struct command_iu *cmd_iu = cmdbuf;
1101 struct usbg_cmd *cmd;
1102 struct usbg_tpg *tpg = fu->tpg;
1103 struct tcm_usbg_nexus *tv_nexus;
1104 u32 cmd_len;
1105 u16 scsi_tag;
1106
1107 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1108 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1109 return -EINVAL;
1110 }
1111
1112 tv_nexus = tpg->tpg_nexus;
1113 if (!tv_nexus) {
1114 pr_err("Missing nexus, ignoring command\n");
1115 return -EINVAL;
1116 }
1117
1118 cmd_len = (cmd_iu->len & ~0x3) + 16;
1119 if (cmd_len > USBG_MAX_CMD)
1120 return -EINVAL;
1121
1122 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1123 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1124 if (IS_ERR(cmd)) {
1125 pr_err("usbg_get_cmd failed\n");
1126 return -ENOMEM;
1127 }
1128 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1129
1130 if (fu->flags & USBG_USE_STREAMS) {
1131 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1132 goto err;
1133 if (!cmd->tag)
1134 cmd->stream = &fu->stream[0];
1135 else
1136 cmd->stream = &fu->stream[cmd->tag - 1];
1137 } else {
1138 cmd->stream = &fu->stream[0];
1139 }
1140
1141 switch (cmd_iu->prio_attr & 0x7) {
1142 case UAS_HEAD_TAG:
1143 cmd->prio_attr = TCM_HEAD_TAG;
1144 break;
1145 case UAS_ORDERED_TAG:
1146 cmd->prio_attr = TCM_ORDERED_TAG;
1147 break;
1148 case UAS_ACA:
1149 cmd->prio_attr = TCM_ACA_TAG;
1150 break;
1151 default:
1152 pr_debug_once("Unsupported prio_attr: %02x.\n",
1153 cmd_iu->prio_attr);
1154 fallthrough;
1155 case UAS_SIMPLE_TAG:
1156 cmd->prio_attr = TCM_SIMPLE_TAG;
1157 break;
1158 }
1159
1160 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1161
1162 INIT_WORK(&cmd->work, usbg_cmd_work);
1163 queue_work(tpg->workqueue, &cmd->work);
1164
1165 return 0;
1166err:
1167 usbg_release_cmd(&cmd->se_cmd);
1168 return -EINVAL;
1169}
1170
1171static void bot_cmd_work(struct work_struct *work)
1172{
1173 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1174 struct se_cmd *se_cmd;
1175 struct tcm_usbg_nexus *tv_nexus;
1176 struct usbg_tpg *tpg;
1177 int dir;
1178
1179 se_cmd = &cmd->se_cmd;
1180 tpg = cmd->fu->tpg;
1181 tv_nexus = tpg->tpg_nexus;
1182 dir = get_cmd_dir(cmd->cmd_buf);
1183 if (dir < 0) {
1184 transport_init_se_cmd(se_cmd,
1185 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1186 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1187 cmd->prio_attr, cmd->sense_iu.sense,
1188 cmd->unpacked_lun);
1189 goto out;
1190 }
1191
1192 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1193 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1194 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1195 goto out;
1196
1197 return;
1198
1199out:
1200 transport_send_check_condition_and_sense(se_cmd,
1201 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1202 transport_generic_free_cmd(&cmd->se_cmd, 0);
1203}
1204
1205static int bot_submit_command(struct f_uas *fu,
1206 void *cmdbuf, unsigned int len)
1207{
1208 struct bulk_cb_wrap *cbw = cmdbuf;
1209 struct usbg_cmd *cmd;
1210 struct usbg_tpg *tpg = fu->tpg;
1211 struct tcm_usbg_nexus *tv_nexus;
1212 u32 cmd_len;
1213
1214 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1215 pr_err("Wrong signature on CBW\n");
1216 return -EINVAL;
1217 }
1218 if (len != 31) {
1219 pr_err("Wrong length for CBW\n");
1220 return -EINVAL;
1221 }
1222
1223 cmd_len = cbw->Length;
1224 if (cmd_len < 1 || cmd_len > 16)
1225 return -EINVAL;
1226
1227 tv_nexus = tpg->tpg_nexus;
1228 if (!tv_nexus) {
1229 pr_err("Missing nexus, ignoring command\n");
1230 return -ENODEV;
1231 }
1232
1233 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1234 if (IS_ERR(cmd)) {
1235 pr_err("usbg_get_cmd failed\n");
1236 return -ENOMEM;
1237 }
1238 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1239
1240 cmd->bot_tag = cbw->Tag;
1241 cmd->prio_attr = TCM_SIMPLE_TAG;
1242 cmd->unpacked_lun = cbw->Lun;
1243 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1244 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1245 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1246
1247 INIT_WORK(&cmd->work, bot_cmd_work);
1248 queue_work(tpg->workqueue, &cmd->work);
1249
1250 return 0;
1251}
1252
1253
1254
1255static int usbg_check_true(struct se_portal_group *se_tpg)
1256{
1257 return 1;
1258}
1259
1260static int usbg_check_false(struct se_portal_group *se_tpg)
1261{
1262 return 0;
1263}
1264
1265static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1266{
1267 struct usbg_tpg *tpg = container_of(se_tpg,
1268 struct usbg_tpg, se_tpg);
1269 struct usbg_tport *tport = tpg->tport;
1270
1271 return &tport->tport_name[0];
1272}
1273
1274static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1275{
1276 struct usbg_tpg *tpg = container_of(se_tpg,
1277 struct usbg_tpg, se_tpg);
1278 return tpg->tport_tpgt;
1279}
1280
1281static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1282{
1283 return 1;
1284}
1285
1286static void usbg_release_cmd(struct se_cmd *se_cmd)
1287{
1288 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1289 se_cmd);
1290 struct se_session *se_sess = se_cmd->se_sess;
1291
1292 kfree(cmd->data_buf);
1293 target_free_tag(se_sess, se_cmd);
1294}
1295
1296static u32 usbg_sess_get_index(struct se_session *se_sess)
1297{
1298 return 0;
1299}
1300
1301static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1302{
1303}
1304
1305static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1306{
1307 return 0;
1308}
1309
1310static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1311{
1312}
1313
1314static void usbg_aborted_task(struct se_cmd *se_cmd)
1315{
1316}
1317
1318static const char *usbg_check_wwn(const char *name)
1319{
1320 const char *n;
1321 unsigned int len;
1322
1323 n = strstr(name, "naa.");
1324 if (!n)
1325 return NULL;
1326 n += 4;
1327 len = strlen(n);
1328 if (len == 0 || len > USBG_NAMELEN - 1)
1329 return NULL;
1330 return n;
1331}
1332
1333static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1334{
1335 if (!usbg_check_wwn(name))
1336 return -EINVAL;
1337 return 0;
1338}
1339
1340static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1341 const char *name)
1342{
1343 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1344 tport_wwn);
1345 struct usbg_tpg *tpg;
1346 unsigned long tpgt;
1347 int ret;
1348 struct f_tcm_opts *opts;
1349 unsigned i;
1350
1351 if (strstr(name, "tpgt_") != name)
1352 return ERR_PTR(-EINVAL);
1353 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1354 return ERR_PTR(-EINVAL);
1355 ret = -ENODEV;
1356 mutex_lock(&tpg_instances_lock);
1357 for (i = 0; i < TPG_INSTANCES; ++i)
1358 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1359 break;
1360 if (i == TPG_INSTANCES)
1361 goto unlock_inst;
1362
1363 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1364 func_inst);
1365 mutex_lock(&opts->dep_lock);
1366 if (!opts->ready)
1367 goto unlock_dep;
1368
1369 if (opts->has_dep) {
1370 if (!try_module_get(opts->dependent))
1371 goto unlock_dep;
1372 } else {
1373 ret = configfs_depend_item_unlocked(
1374 wwn->wwn_group.cg_subsys,
1375 &opts->func_inst.group.cg_item);
1376 if (ret)
1377 goto unlock_dep;
1378 }
1379
1380 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1381 ret = -ENOMEM;
1382 if (!tpg)
1383 goto unref_dep;
1384 mutex_init(&tpg->tpg_mutex);
1385 atomic_set(&tpg->tpg_port_count, 0);
1386 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1387 if (!tpg->workqueue)
1388 goto free_tpg;
1389
1390 tpg->tport = tport;
1391 tpg->tport_tpgt = tpgt;
1392
1393
1394
1395
1396
1397 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1398 if (ret < 0)
1399 goto free_workqueue;
1400
1401 tpg_instances[i].tpg = tpg;
1402 tpg->fi = tpg_instances[i].func_inst;
1403 mutex_unlock(&opts->dep_lock);
1404 mutex_unlock(&tpg_instances_lock);
1405 return &tpg->se_tpg;
1406
1407free_workqueue:
1408 destroy_workqueue(tpg->workqueue);
1409free_tpg:
1410 kfree(tpg);
1411unref_dep:
1412 if (opts->has_dep)
1413 module_put(opts->dependent);
1414 else
1415 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1416unlock_dep:
1417 mutex_unlock(&opts->dep_lock);
1418unlock_inst:
1419 mutex_unlock(&tpg_instances_lock);
1420
1421 return ERR_PTR(ret);
1422}
1423
1424static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1425
1426static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1427{
1428 struct usbg_tpg *tpg = container_of(se_tpg,
1429 struct usbg_tpg, se_tpg);
1430 unsigned i;
1431 struct f_tcm_opts *opts;
1432
1433 tcm_usbg_drop_nexus(tpg);
1434 core_tpg_deregister(se_tpg);
1435 destroy_workqueue(tpg->workqueue);
1436
1437 mutex_lock(&tpg_instances_lock);
1438 for (i = 0; i < TPG_INSTANCES; ++i)
1439 if (tpg_instances[i].tpg == tpg)
1440 break;
1441 if (i < TPG_INSTANCES) {
1442 tpg_instances[i].tpg = NULL;
1443 opts = container_of(tpg_instances[i].func_inst,
1444 struct f_tcm_opts, func_inst);
1445 mutex_lock(&opts->dep_lock);
1446 if (opts->has_dep)
1447 module_put(opts->dependent);
1448 else
1449 configfs_undepend_item_unlocked(
1450 &opts->func_inst.group.cg_item);
1451 mutex_unlock(&opts->dep_lock);
1452 }
1453 mutex_unlock(&tpg_instances_lock);
1454
1455 kfree(tpg);
1456}
1457
1458static struct se_wwn *usbg_make_tport(
1459 struct target_fabric_configfs *tf,
1460 struct config_group *group,
1461 const char *name)
1462{
1463 struct usbg_tport *tport;
1464 const char *wnn_name;
1465 u64 wwpn = 0;
1466
1467 wnn_name = usbg_check_wwn(name);
1468 if (!wnn_name)
1469 return ERR_PTR(-EINVAL);
1470
1471 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1472 if (!(tport))
1473 return ERR_PTR(-ENOMEM);
1474
1475 tport->tport_wwpn = wwpn;
1476 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1477 return &tport->tport_wwn;
1478}
1479
1480static void usbg_drop_tport(struct se_wwn *wwn)
1481{
1482 struct usbg_tport *tport = container_of(wwn,
1483 struct usbg_tport, tport_wwn);
1484 kfree(tport);
1485}
1486
1487
1488
1489
1490static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1491{
1492 return sprintf(page, "usb-gadget fabric module\n");
1493}
1494
1495CONFIGFS_ATTR_RO(usbg_wwn_, version);
1496
1497static struct configfs_attribute *usbg_wwn_attrs[] = {
1498 &usbg_wwn_attr_version,
1499 NULL,
1500};
1501
1502static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1503{
1504 struct se_portal_group *se_tpg = to_tpg(item);
1505 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1506
1507 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1508}
1509
1510static int usbg_attach(struct usbg_tpg *);
1511static void usbg_detach(struct usbg_tpg *);
1512
1513static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1514 const char *page, size_t count)
1515{
1516 struct se_portal_group *se_tpg = to_tpg(item);
1517 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1518 bool op;
1519 ssize_t ret;
1520
1521 ret = strtobool(page, &op);
1522 if (ret)
1523 return ret;
1524
1525 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1526 return -EINVAL;
1527
1528 if (op)
1529 ret = usbg_attach(tpg);
1530 else
1531 usbg_detach(tpg);
1532 if (ret)
1533 return ret;
1534
1535 tpg->gadget_connect = op;
1536
1537 return count;
1538}
1539
1540static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1541{
1542 struct se_portal_group *se_tpg = to_tpg(item);
1543 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1544 struct tcm_usbg_nexus *tv_nexus;
1545 ssize_t ret;
1546
1547 mutex_lock(&tpg->tpg_mutex);
1548 tv_nexus = tpg->tpg_nexus;
1549 if (!tv_nexus) {
1550 ret = -ENODEV;
1551 goto out;
1552 }
1553 ret = snprintf(page, PAGE_SIZE, "%s\n",
1554 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1555out:
1556 mutex_unlock(&tpg->tpg_mutex);
1557 return ret;
1558}
1559
1560static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1561 struct se_session *se_sess, void *p)
1562{
1563 struct usbg_tpg *tpg = container_of(se_tpg,
1564 struct usbg_tpg, se_tpg);
1565
1566 tpg->tpg_nexus = p;
1567 return 0;
1568}
1569
1570static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1571{
1572 struct tcm_usbg_nexus *tv_nexus;
1573 int ret = 0;
1574
1575 mutex_lock(&tpg->tpg_mutex);
1576 if (tpg->tpg_nexus) {
1577 ret = -EEXIST;
1578 pr_debug("tpg->tpg_nexus already exists\n");
1579 goto out_unlock;
1580 }
1581
1582 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1583 if (!tv_nexus) {
1584 ret = -ENOMEM;
1585 goto out_unlock;
1586 }
1587
1588 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1589 USB_G_DEFAULT_SESSION_TAGS,
1590 sizeof(struct usbg_cmd),
1591 TARGET_PROT_NORMAL, name,
1592 tv_nexus, usbg_alloc_sess_cb);
1593 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1594#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1595 pr_debug(MAKE_NEXUS_MSG, name);
1596#undef MAKE_NEXUS_MSG
1597 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1598 kfree(tv_nexus);
1599 }
1600
1601out_unlock:
1602 mutex_unlock(&tpg->tpg_mutex);
1603 return ret;
1604}
1605
1606static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1607{
1608 struct se_session *se_sess;
1609 struct tcm_usbg_nexus *tv_nexus;
1610 int ret = -ENODEV;
1611
1612 mutex_lock(&tpg->tpg_mutex);
1613 tv_nexus = tpg->tpg_nexus;
1614 if (!tv_nexus)
1615 goto out;
1616
1617 se_sess = tv_nexus->tvn_se_sess;
1618 if (!se_sess)
1619 goto out;
1620
1621 if (atomic_read(&tpg->tpg_port_count)) {
1622 ret = -EPERM;
1623#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1624 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1625#undef MSG
1626 goto out;
1627 }
1628
1629 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1630 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1631
1632
1633
1634 target_remove_session(se_sess);
1635 tpg->tpg_nexus = NULL;
1636
1637 kfree(tv_nexus);
1638 ret = 0;
1639out:
1640 mutex_unlock(&tpg->tpg_mutex);
1641 return ret;
1642}
1643
1644static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1645 const char *page, size_t count)
1646{
1647 struct se_portal_group *se_tpg = to_tpg(item);
1648 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1649 unsigned char i_port[USBG_NAMELEN], *ptr;
1650 int ret;
1651
1652 if (!strncmp(page, "NULL", 4)) {
1653 ret = tcm_usbg_drop_nexus(tpg);
1654 return (!ret) ? count : ret;
1655 }
1656 if (strlen(page) >= USBG_NAMELEN) {
1657
1658#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1659 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1660#undef NEXUS_STORE_MSG
1661 return -EINVAL;
1662 }
1663 snprintf(i_port, USBG_NAMELEN, "%s", page);
1664
1665 ptr = strstr(i_port, "naa.");
1666 if (!ptr) {
1667 pr_err("Missing 'naa.' prefix\n");
1668 return -EINVAL;
1669 }
1670
1671 if (i_port[strlen(i_port) - 1] == '\n')
1672 i_port[strlen(i_port) - 1] = '\0';
1673
1674 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1675 if (ret < 0)
1676 return ret;
1677 return count;
1678}
1679
1680CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1681CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1682
1683static struct configfs_attribute *usbg_base_attrs[] = {
1684 &tcm_usbg_tpg_attr_enable,
1685 &tcm_usbg_tpg_attr_nexus,
1686 NULL,
1687};
1688
1689static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1690{
1691 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1692
1693 atomic_inc(&tpg->tpg_port_count);
1694 smp_mb__after_atomic();
1695 return 0;
1696}
1697
1698static void usbg_port_unlink(struct se_portal_group *se_tpg,
1699 struct se_lun *se_lun)
1700{
1701 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1702
1703 atomic_dec(&tpg->tpg_port_count);
1704 smp_mb__after_atomic();
1705}
1706
1707static int usbg_check_stop_free(struct se_cmd *se_cmd)
1708{
1709 return target_put_sess_cmd(se_cmd);
1710}
1711
1712static const struct target_core_fabric_ops usbg_ops = {
1713 .module = THIS_MODULE,
1714 .fabric_name = "usb_gadget",
1715 .tpg_get_wwn = usbg_get_fabric_wwn,
1716 .tpg_get_tag = usbg_get_tag,
1717 .tpg_check_demo_mode = usbg_check_true,
1718 .tpg_check_demo_mode_cache = usbg_check_false,
1719 .tpg_check_demo_mode_write_protect = usbg_check_false,
1720 .tpg_check_prod_mode_write_protect = usbg_check_false,
1721 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1722 .release_cmd = usbg_release_cmd,
1723 .sess_get_index = usbg_sess_get_index,
1724 .sess_get_initiator_sid = NULL,
1725 .write_pending = usbg_send_write_request,
1726 .set_default_node_attributes = usbg_set_default_node_attrs,
1727 .get_cmd_state = usbg_get_cmd_state,
1728 .queue_data_in = usbg_send_read_response,
1729 .queue_status = usbg_send_status_response,
1730 .queue_tm_rsp = usbg_queue_tm_rsp,
1731 .aborted_task = usbg_aborted_task,
1732 .check_stop_free = usbg_check_stop_free,
1733
1734 .fabric_make_wwn = usbg_make_tport,
1735 .fabric_drop_wwn = usbg_drop_tport,
1736 .fabric_make_tpg = usbg_make_tpg,
1737 .fabric_drop_tpg = usbg_drop_tpg,
1738 .fabric_post_link = usbg_port_link,
1739 .fabric_pre_unlink = usbg_port_unlink,
1740 .fabric_init_nodeacl = usbg_init_nodeacl,
1741
1742 .tfc_wwn_attrs = usbg_wwn_attrs,
1743 .tfc_tpg_base_attrs = usbg_base_attrs,
1744};
1745
1746
1747
1748static struct usb_interface_descriptor bot_intf_desc = {
1749 .bLength = sizeof(bot_intf_desc),
1750 .bDescriptorType = USB_DT_INTERFACE,
1751 .bNumEndpoints = 2,
1752 .bAlternateSetting = USB_G_ALT_INT_BBB,
1753 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1754 .bInterfaceSubClass = USB_SC_SCSI,
1755 .bInterfaceProtocol = USB_PR_BULK,
1756};
1757
1758static struct usb_interface_descriptor uasp_intf_desc = {
1759 .bLength = sizeof(uasp_intf_desc),
1760 .bDescriptorType = USB_DT_INTERFACE,
1761 .bNumEndpoints = 4,
1762 .bAlternateSetting = USB_G_ALT_INT_UAS,
1763 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1764 .bInterfaceSubClass = USB_SC_SCSI,
1765 .bInterfaceProtocol = USB_PR_UAS,
1766};
1767
1768static struct usb_endpoint_descriptor uasp_bi_desc = {
1769 .bLength = USB_DT_ENDPOINT_SIZE,
1770 .bDescriptorType = USB_DT_ENDPOINT,
1771 .bEndpointAddress = USB_DIR_IN,
1772 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1773 .wMaxPacketSize = cpu_to_le16(512),
1774};
1775
1776static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1777 .bLength = USB_DT_ENDPOINT_SIZE,
1778 .bDescriptorType = USB_DT_ENDPOINT,
1779 .bEndpointAddress = USB_DIR_IN,
1780 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1781};
1782
1783static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1784 .bLength = sizeof(uasp_bi_pipe_desc),
1785 .bDescriptorType = USB_DT_PIPE_USAGE,
1786 .bPipeID = DATA_IN_PIPE_ID,
1787};
1788
1789static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1790 .bLength = USB_DT_ENDPOINT_SIZE,
1791 .bDescriptorType = USB_DT_ENDPOINT,
1792 .bEndpointAddress = USB_DIR_IN,
1793 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1794 .wMaxPacketSize = cpu_to_le16(1024),
1795};
1796
1797static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1798 .bLength = sizeof(uasp_bi_ep_comp_desc),
1799 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1800 .bMaxBurst = 0,
1801 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1802 .wBytesPerInterval = 0,
1803};
1804
1805static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1806 .bLength = sizeof(bot_bi_ep_comp_desc),
1807 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1808 .bMaxBurst = 0,
1809};
1810
1811static struct usb_endpoint_descriptor uasp_bo_desc = {
1812 .bLength = USB_DT_ENDPOINT_SIZE,
1813 .bDescriptorType = USB_DT_ENDPOINT,
1814 .bEndpointAddress = USB_DIR_OUT,
1815 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1816 .wMaxPacketSize = cpu_to_le16(512),
1817};
1818
1819static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1820 .bLength = USB_DT_ENDPOINT_SIZE,
1821 .bDescriptorType = USB_DT_ENDPOINT,
1822 .bEndpointAddress = USB_DIR_OUT,
1823 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1824};
1825
1826static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1827 .bLength = sizeof(uasp_bo_pipe_desc),
1828 .bDescriptorType = USB_DT_PIPE_USAGE,
1829 .bPipeID = DATA_OUT_PIPE_ID,
1830};
1831
1832static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1833 .bLength = USB_DT_ENDPOINT_SIZE,
1834 .bDescriptorType = USB_DT_ENDPOINT,
1835 .bEndpointAddress = USB_DIR_OUT,
1836 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1837 .wMaxPacketSize = cpu_to_le16(0x400),
1838};
1839
1840static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1841 .bLength = sizeof(uasp_bo_ep_comp_desc),
1842 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1843 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1844};
1845
1846static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1847 .bLength = sizeof(bot_bo_ep_comp_desc),
1848 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1849};
1850
1851static struct usb_endpoint_descriptor uasp_status_desc = {
1852 .bLength = USB_DT_ENDPOINT_SIZE,
1853 .bDescriptorType = USB_DT_ENDPOINT,
1854 .bEndpointAddress = USB_DIR_IN,
1855 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1856 .wMaxPacketSize = cpu_to_le16(512),
1857};
1858
1859static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1860 .bLength = USB_DT_ENDPOINT_SIZE,
1861 .bDescriptorType = USB_DT_ENDPOINT,
1862 .bEndpointAddress = USB_DIR_IN,
1863 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1864};
1865
1866static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1867 .bLength = sizeof(uasp_status_pipe_desc),
1868 .bDescriptorType = USB_DT_PIPE_USAGE,
1869 .bPipeID = STATUS_PIPE_ID,
1870};
1871
1872static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1873 .bLength = USB_DT_ENDPOINT_SIZE,
1874 .bDescriptorType = USB_DT_ENDPOINT,
1875 .bEndpointAddress = USB_DIR_IN,
1876 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1877 .wMaxPacketSize = cpu_to_le16(1024),
1878};
1879
1880static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1881 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1882 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1883 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1884};
1885
1886static struct usb_endpoint_descriptor uasp_cmd_desc = {
1887 .bLength = USB_DT_ENDPOINT_SIZE,
1888 .bDescriptorType = USB_DT_ENDPOINT,
1889 .bEndpointAddress = USB_DIR_OUT,
1890 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1891 .wMaxPacketSize = cpu_to_le16(512),
1892};
1893
1894static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1895 .bLength = USB_DT_ENDPOINT_SIZE,
1896 .bDescriptorType = USB_DT_ENDPOINT,
1897 .bEndpointAddress = USB_DIR_OUT,
1898 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1899};
1900
1901static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1902 .bLength = sizeof(uasp_cmd_pipe_desc),
1903 .bDescriptorType = USB_DT_PIPE_USAGE,
1904 .bPipeID = CMD_PIPE_ID,
1905};
1906
1907static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1908 .bLength = USB_DT_ENDPOINT_SIZE,
1909 .bDescriptorType = USB_DT_ENDPOINT,
1910 .bEndpointAddress = USB_DIR_OUT,
1911 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1912 .wMaxPacketSize = cpu_to_le16(1024),
1913};
1914
1915static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1916 .bLength = sizeof(uasp_cmd_comp_desc),
1917 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1918};
1919
1920static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1921 (struct usb_descriptor_header *) &bot_intf_desc,
1922 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1923 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1924
1925 (struct usb_descriptor_header *) &uasp_intf_desc,
1926 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1927 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1928 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1929 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1930 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1931 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1932 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1933 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1934 NULL,
1935};
1936
1937static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1938 (struct usb_descriptor_header *) &bot_intf_desc,
1939 (struct usb_descriptor_header *) &uasp_bi_desc,
1940 (struct usb_descriptor_header *) &uasp_bo_desc,
1941
1942 (struct usb_descriptor_header *) &uasp_intf_desc,
1943 (struct usb_descriptor_header *) &uasp_bi_desc,
1944 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1945 (struct usb_descriptor_header *) &uasp_bo_desc,
1946 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1947 (struct usb_descriptor_header *) &uasp_status_desc,
1948 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1949 (struct usb_descriptor_header *) &uasp_cmd_desc,
1950 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1951 NULL,
1952};
1953
1954static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1955 (struct usb_descriptor_header *) &bot_intf_desc,
1956 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1957 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1958 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1959 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1960
1961 (struct usb_descriptor_header *) &uasp_intf_desc,
1962 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1963 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1964 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1965 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1966 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1967 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1968 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1969 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1970 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1971 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1972 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1973 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1974 NULL,
1975};
1976
1977static struct usb_string tcm_us_strings[] = {
1978 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1979 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1980 { },
1981};
1982
1983static struct usb_gadget_strings tcm_stringtab = {
1984 .language = 0x0409,
1985 .strings = tcm_us_strings,
1986};
1987
1988static struct usb_gadget_strings *tcm_strings[] = {
1989 &tcm_stringtab,
1990 NULL,
1991};
1992
1993static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1994{
1995 struct f_uas *fu = to_f_uas(f);
1996 struct usb_string *us;
1997 struct usb_gadget *gadget = c->cdev->gadget;
1998 struct usb_ep *ep;
1999 struct f_tcm_opts *opts;
2000 int iface;
2001 int ret;
2002
2003 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2004
2005 mutex_lock(&opts->dep_lock);
2006 if (!opts->can_attach) {
2007 mutex_unlock(&opts->dep_lock);
2008 return -ENODEV;
2009 }
2010 mutex_unlock(&opts->dep_lock);
2011 us = usb_gstrings_attach(c->cdev, tcm_strings,
2012 ARRAY_SIZE(tcm_us_strings));
2013 if (IS_ERR(us))
2014 return PTR_ERR(us);
2015 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2016 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2017
2018 iface = usb_interface_id(c, f);
2019 if (iface < 0)
2020 return iface;
2021
2022 bot_intf_desc.bInterfaceNumber = iface;
2023 uasp_intf_desc.bInterfaceNumber = iface;
2024 fu->iface = iface;
2025 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2026 &uasp_bi_ep_comp_desc);
2027 if (!ep)
2028 goto ep_fail;
2029
2030 fu->ep_in = ep;
2031
2032 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2033 &uasp_bo_ep_comp_desc);
2034 if (!ep)
2035 goto ep_fail;
2036 fu->ep_out = ep;
2037
2038 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2039 &uasp_status_in_ep_comp_desc);
2040 if (!ep)
2041 goto ep_fail;
2042 fu->ep_status = ep;
2043
2044 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2045 &uasp_cmd_comp_desc);
2046 if (!ep)
2047 goto ep_fail;
2048 fu->ep_cmd = ep;
2049
2050
2051 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2052 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2053 uasp_status_desc.bEndpointAddress =
2054 uasp_ss_status_desc.bEndpointAddress;
2055 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2056
2057 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2058 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2059 uasp_fs_status_desc.bEndpointAddress =
2060 uasp_ss_status_desc.bEndpointAddress;
2061 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2062
2063 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2064 uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2065 if (ret)
2066 goto ep_fail;
2067
2068 return 0;
2069ep_fail:
2070 pr_err("Can't claim all required eps\n");
2071
2072 return -ENOTSUPP;
2073}
2074
2075struct guas_setup_wq {
2076 struct work_struct work;
2077 struct f_uas *fu;
2078 unsigned int alt;
2079};
2080
2081static void tcm_delayed_set_alt(struct work_struct *wq)
2082{
2083 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2084 work);
2085 struct f_uas *fu = work->fu;
2086 int alt = work->alt;
2087
2088 kfree(work);
2089
2090 if (fu->flags & USBG_IS_BOT)
2091 bot_cleanup_old_alt(fu);
2092 if (fu->flags & USBG_IS_UAS)
2093 uasp_cleanup_old_alt(fu);
2094
2095 if (alt == USB_G_ALT_INT_BBB)
2096 bot_set_alt(fu);
2097 else if (alt == USB_G_ALT_INT_UAS)
2098 uasp_set_alt(fu);
2099 usb_composite_setup_continue(fu->function.config->cdev);
2100}
2101
2102static int tcm_get_alt(struct usb_function *f, unsigned intf)
2103{
2104 if (intf == bot_intf_desc.bInterfaceNumber)
2105 return USB_G_ALT_INT_BBB;
2106 if (intf == uasp_intf_desc.bInterfaceNumber)
2107 return USB_G_ALT_INT_UAS;
2108
2109 return -EOPNOTSUPP;
2110}
2111
2112static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2113{
2114 struct f_uas *fu = to_f_uas(f);
2115
2116 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2117 struct guas_setup_wq *work;
2118
2119 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2120 if (!work)
2121 return -ENOMEM;
2122 INIT_WORK(&work->work, tcm_delayed_set_alt);
2123 work->fu = fu;
2124 work->alt = alt;
2125 schedule_work(&work->work);
2126 return USB_GADGET_DELAYED_STATUS;
2127 }
2128 return -EOPNOTSUPP;
2129}
2130
2131static void tcm_disable(struct usb_function *f)
2132{
2133 struct f_uas *fu = to_f_uas(f);
2134
2135 if (fu->flags & USBG_IS_UAS)
2136 uasp_cleanup_old_alt(fu);
2137 else if (fu->flags & USBG_IS_BOT)
2138 bot_cleanup_old_alt(fu);
2139 fu->flags = 0;
2140}
2141
2142static int tcm_setup(struct usb_function *f,
2143 const struct usb_ctrlrequest *ctrl)
2144{
2145 struct f_uas *fu = to_f_uas(f);
2146
2147 if (!(fu->flags & USBG_IS_BOT))
2148 return -EOPNOTSUPP;
2149
2150 return usbg_bot_setup(f, ctrl);
2151}
2152
2153static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2154{
2155 return container_of(to_config_group(item), struct f_tcm_opts,
2156 func_inst.group);
2157}
2158
2159static void tcm_attr_release(struct config_item *item)
2160{
2161 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2162
2163 usb_put_function_instance(&opts->func_inst);
2164}
2165
2166static struct configfs_item_operations tcm_item_ops = {
2167 .release = tcm_attr_release,
2168};
2169
2170static const struct config_item_type tcm_func_type = {
2171 .ct_item_ops = &tcm_item_ops,
2172 .ct_owner = THIS_MODULE,
2173};
2174
2175static void tcm_free_inst(struct usb_function_instance *f)
2176{
2177 struct f_tcm_opts *opts;
2178 unsigned i;
2179
2180 opts = container_of(f, struct f_tcm_opts, func_inst);
2181
2182 mutex_lock(&tpg_instances_lock);
2183 for (i = 0; i < TPG_INSTANCES; ++i)
2184 if (tpg_instances[i].func_inst == f)
2185 break;
2186 if (i < TPG_INSTANCES)
2187 tpg_instances[i].func_inst = NULL;
2188 mutex_unlock(&tpg_instances_lock);
2189
2190 kfree(opts);
2191}
2192
2193static int tcm_register_callback(struct usb_function_instance *f)
2194{
2195 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2196
2197 mutex_lock(&opts->dep_lock);
2198 opts->can_attach = true;
2199 mutex_unlock(&opts->dep_lock);
2200
2201 return 0;
2202}
2203
2204static void tcm_unregister_callback(struct usb_function_instance *f)
2205{
2206 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2207
2208 mutex_lock(&opts->dep_lock);
2209 unregister_gadget_item(opts->
2210 func_inst.group.cg_item.ci_parent->ci_parent);
2211 opts->can_attach = false;
2212 mutex_unlock(&opts->dep_lock);
2213}
2214
2215static int usbg_attach(struct usbg_tpg *tpg)
2216{
2217 struct usb_function_instance *f = tpg->fi;
2218 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2219
2220 if (opts->tcm_register_callback)
2221 return opts->tcm_register_callback(f);
2222
2223 return 0;
2224}
2225
2226static void usbg_detach(struct usbg_tpg *tpg)
2227{
2228 struct usb_function_instance *f = tpg->fi;
2229 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2230
2231 if (opts->tcm_unregister_callback)
2232 opts->tcm_unregister_callback(f);
2233}
2234
2235static int tcm_set_name(struct usb_function_instance *f, const char *name)
2236{
2237 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2238
2239 pr_debug("tcm: Activating %s\n", name);
2240
2241 mutex_lock(&opts->dep_lock);
2242 opts->ready = true;
2243 mutex_unlock(&opts->dep_lock);
2244
2245 return 0;
2246}
2247
2248static struct usb_function_instance *tcm_alloc_inst(void)
2249{
2250 struct f_tcm_opts *opts;
2251 int i;
2252
2253
2254 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2255 if (!opts)
2256 return ERR_PTR(-ENOMEM);
2257
2258 mutex_lock(&tpg_instances_lock);
2259 for (i = 0; i < TPG_INSTANCES; ++i)
2260 if (!tpg_instances[i].func_inst)
2261 break;
2262
2263 if (i == TPG_INSTANCES) {
2264 mutex_unlock(&tpg_instances_lock);
2265 kfree(opts);
2266 return ERR_PTR(-EBUSY);
2267 }
2268 tpg_instances[i].func_inst = &opts->func_inst;
2269 mutex_unlock(&tpg_instances_lock);
2270
2271 mutex_init(&opts->dep_lock);
2272 opts->func_inst.set_inst_name = tcm_set_name;
2273 opts->func_inst.free_func_inst = tcm_free_inst;
2274 opts->tcm_register_callback = tcm_register_callback;
2275 opts->tcm_unregister_callback = tcm_unregister_callback;
2276
2277 config_group_init_type_name(&opts->func_inst.group, "",
2278 &tcm_func_type);
2279
2280 return &opts->func_inst;
2281}
2282
2283static void tcm_free(struct usb_function *f)
2284{
2285 struct f_uas *tcm = to_f_uas(f);
2286
2287 kfree(tcm);
2288}
2289
2290static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2291{
2292 usb_free_all_descriptors(f);
2293}
2294
2295static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2296{
2297 struct f_uas *fu;
2298 unsigned i;
2299
2300 mutex_lock(&tpg_instances_lock);
2301 for (i = 0; i < TPG_INSTANCES; ++i)
2302 if (tpg_instances[i].func_inst == fi)
2303 break;
2304 if (i == TPG_INSTANCES) {
2305 mutex_unlock(&tpg_instances_lock);
2306 return ERR_PTR(-ENODEV);
2307 }
2308
2309 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2310 if (!fu) {
2311 mutex_unlock(&tpg_instances_lock);
2312 return ERR_PTR(-ENOMEM);
2313 }
2314
2315 fu->function.name = "Target Function";
2316 fu->function.bind = tcm_bind;
2317 fu->function.unbind = tcm_unbind;
2318 fu->function.set_alt = tcm_set_alt;
2319 fu->function.get_alt = tcm_get_alt;
2320 fu->function.setup = tcm_setup;
2321 fu->function.disable = tcm_disable;
2322 fu->function.free_func = tcm_free;
2323 fu->tpg = tpg_instances[i].tpg;
2324 mutex_unlock(&tpg_instances_lock);
2325
2326 return &fu->function;
2327}
2328
2329DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2330
2331static int tcm_init(void)
2332{
2333 int ret;
2334
2335 ret = usb_function_register(&tcmusb_func);
2336 if (ret)
2337 return ret;
2338
2339 ret = target_register_template(&usbg_ops);
2340 if (ret)
2341 usb_function_unregister(&tcmusb_func);
2342
2343 return ret;
2344}
2345module_init(tcm_init);
2346
2347static void tcm_exit(void)
2348{
2349 target_unregister_template(&usbg_ops);
2350 usb_function_unregister(&tcmusb_func);
2351}
2352module_exit(tcm_exit);
2353
2354MODULE_LICENSE("GPL");
2355MODULE_AUTHOR("Sebastian Andrzej Siewior");
2356
