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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_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB);
396 ret = usb_ep_enable(fu->ep_in);
397 if (ret)
398 goto err_b_in;
399
400 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB);
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_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS);
856 ret = usb_ep_enable(fu->ep_in);
857 if (ret)
858 goto err_b_in;
859
860 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS);
861 ret = usb_ep_enable(fu->ep_out);
862 if (ret)
863 goto err_b_out;
864
865 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS);
866 ret = usb_ep_enable(fu->ep_cmd);
867 if (ret)
868 goto err_cmd;
869 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS);
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 __target_init_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 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);
1064 return;
1065
1066out:
1067 transport_send_check_condition_and_sense(se_cmd,
1068 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1069 transport_generic_free_cmd(&cmd->se_cmd, 0);
1070}
1071
1072static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1073 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1074{
1075 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1076 struct usbg_cmd *cmd;
1077 int tag, cpu;
1078
1079 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1080 if (tag < 0)
1081 return ERR_PTR(-ENOMEM);
1082
1083 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1084 memset(cmd, 0, sizeof(*cmd));
1085 cmd->se_cmd.map_tag = tag;
1086 cmd->se_cmd.map_cpu = cpu;
1087 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1088 cmd->fu = fu;
1089
1090 return cmd;
1091}
1092
1093static void usbg_release_cmd(struct se_cmd *);
1094
1095static int usbg_submit_command(struct f_uas *fu,
1096 void *cmdbuf, unsigned int len)
1097{
1098 struct command_iu *cmd_iu = cmdbuf;
1099 struct usbg_cmd *cmd;
1100 struct usbg_tpg *tpg = fu->tpg;
1101 struct tcm_usbg_nexus *tv_nexus;
1102 u32 cmd_len;
1103 u16 scsi_tag;
1104
1105 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1106 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1107 return -EINVAL;
1108 }
1109
1110 tv_nexus = tpg->tpg_nexus;
1111 if (!tv_nexus) {
1112 pr_err("Missing nexus, ignoring command\n");
1113 return -EINVAL;
1114 }
1115
1116 cmd_len = (cmd_iu->len & ~0x3) + 16;
1117 if (cmd_len > USBG_MAX_CMD)
1118 return -EINVAL;
1119
1120 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1121 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1122 if (IS_ERR(cmd)) {
1123 pr_err("usbg_get_cmd failed\n");
1124 return -ENOMEM;
1125 }
1126 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1127
1128 if (fu->flags & USBG_USE_STREAMS) {
1129 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1130 goto err;
1131 if (!cmd->tag)
1132 cmd->stream = &fu->stream[0];
1133 else
1134 cmd->stream = &fu->stream[cmd->tag - 1];
1135 } else {
1136 cmd->stream = &fu->stream[0];
1137 }
1138
1139 switch (cmd_iu->prio_attr & 0x7) {
1140 case UAS_HEAD_TAG:
1141 cmd->prio_attr = TCM_HEAD_TAG;
1142 break;
1143 case UAS_ORDERED_TAG:
1144 cmd->prio_attr = TCM_ORDERED_TAG;
1145 break;
1146 case UAS_ACA:
1147 cmd->prio_attr = TCM_ACA_TAG;
1148 break;
1149 default:
1150 pr_debug_once("Unsupported prio_attr: %02x.\n",
1151 cmd_iu->prio_attr);
1152 fallthrough;
1153 case UAS_SIMPLE_TAG:
1154 cmd->prio_attr = TCM_SIMPLE_TAG;
1155 break;
1156 }
1157
1158 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1159
1160 INIT_WORK(&cmd->work, usbg_cmd_work);
1161 queue_work(tpg->workqueue, &cmd->work);
1162
1163 return 0;
1164err:
1165 usbg_release_cmd(&cmd->se_cmd);
1166 return -EINVAL;
1167}
1168
1169static void bot_cmd_work(struct work_struct *work)
1170{
1171 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1172 struct se_cmd *se_cmd;
1173 struct tcm_usbg_nexus *tv_nexus;
1174 struct usbg_tpg *tpg;
1175 int dir;
1176
1177 se_cmd = &cmd->se_cmd;
1178 tpg = cmd->fu->tpg;
1179 tv_nexus = tpg->tpg_nexus;
1180 dir = get_cmd_dir(cmd->cmd_buf);
1181 if (dir < 0) {
1182 __target_init_cmd(se_cmd,
1183 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1184 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1185 cmd->prio_attr, cmd->sense_iu.sense,
1186 cmd->unpacked_lun);
1187 goto out;
1188 }
1189
1190 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1191 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1192 cmd->data_len, cmd->prio_attr, dir, 0);
1193 return;
1194
1195out:
1196 transport_send_check_condition_and_sense(se_cmd,
1197 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1198 transport_generic_free_cmd(&cmd->se_cmd, 0);
1199}
1200
1201static int bot_submit_command(struct f_uas *fu,
1202 void *cmdbuf, unsigned int len)
1203{
1204 struct bulk_cb_wrap *cbw = cmdbuf;
1205 struct usbg_cmd *cmd;
1206 struct usbg_tpg *tpg = fu->tpg;
1207 struct tcm_usbg_nexus *tv_nexus;
1208 u32 cmd_len;
1209
1210 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1211 pr_err("Wrong signature on CBW\n");
1212 return -EINVAL;
1213 }
1214 if (len != 31) {
1215 pr_err("Wrong length for CBW\n");
1216 return -EINVAL;
1217 }
1218
1219 cmd_len = cbw->Length;
1220 if (cmd_len < 1 || cmd_len > 16)
1221 return -EINVAL;
1222
1223 tv_nexus = tpg->tpg_nexus;
1224 if (!tv_nexus) {
1225 pr_err("Missing nexus, ignoring command\n");
1226 return -ENODEV;
1227 }
1228
1229 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1230 if (IS_ERR(cmd)) {
1231 pr_err("usbg_get_cmd failed\n");
1232 return -ENOMEM;
1233 }
1234 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1235
1236 cmd->bot_tag = cbw->Tag;
1237 cmd->prio_attr = TCM_SIMPLE_TAG;
1238 cmd->unpacked_lun = cbw->Lun;
1239 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1240 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1241 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1242
1243 INIT_WORK(&cmd->work, bot_cmd_work);
1244 queue_work(tpg->workqueue, &cmd->work);
1245
1246 return 0;
1247}
1248
1249
1250
1251static int usbg_check_true(struct se_portal_group *se_tpg)
1252{
1253 return 1;
1254}
1255
1256static int usbg_check_false(struct se_portal_group *se_tpg)
1257{
1258 return 0;
1259}
1260
1261static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1262{
1263 struct usbg_tpg *tpg = container_of(se_tpg,
1264 struct usbg_tpg, se_tpg);
1265 struct usbg_tport *tport = tpg->tport;
1266
1267 return &tport->tport_name[0];
1268}
1269
1270static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1271{
1272 struct usbg_tpg *tpg = container_of(se_tpg,
1273 struct usbg_tpg, se_tpg);
1274 return tpg->tport_tpgt;
1275}
1276
1277static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1278{
1279 return 1;
1280}
1281
1282static void usbg_release_cmd(struct se_cmd *se_cmd)
1283{
1284 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1285 se_cmd);
1286 struct se_session *se_sess = se_cmd->se_sess;
1287
1288 kfree(cmd->data_buf);
1289 target_free_tag(se_sess, se_cmd);
1290}
1291
1292static u32 usbg_sess_get_index(struct se_session *se_sess)
1293{
1294 return 0;
1295}
1296
1297static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1298{
1299}
1300
1301static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1302{
1303 return 0;
1304}
1305
1306static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1307{
1308}
1309
1310static void usbg_aborted_task(struct se_cmd *se_cmd)
1311{
1312}
1313
1314static const char *usbg_check_wwn(const char *name)
1315{
1316 const char *n;
1317 unsigned int len;
1318
1319 n = strstr(name, "naa.");
1320 if (!n)
1321 return NULL;
1322 n += 4;
1323 len = strlen(n);
1324 if (len == 0 || len > USBG_NAMELEN - 1)
1325 return NULL;
1326 return n;
1327}
1328
1329static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1330{
1331 if (!usbg_check_wwn(name))
1332 return -EINVAL;
1333 return 0;
1334}
1335
1336static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1337 const char *name)
1338{
1339 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1340 tport_wwn);
1341 struct usbg_tpg *tpg;
1342 unsigned long tpgt;
1343 int ret;
1344 struct f_tcm_opts *opts;
1345 unsigned i;
1346
1347 if (strstr(name, "tpgt_") != name)
1348 return ERR_PTR(-EINVAL);
1349 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1350 return ERR_PTR(-EINVAL);
1351 ret = -ENODEV;
1352 mutex_lock(&tpg_instances_lock);
1353 for (i = 0; i < TPG_INSTANCES; ++i)
1354 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1355 break;
1356 if (i == TPG_INSTANCES)
1357 goto unlock_inst;
1358
1359 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1360 func_inst);
1361 mutex_lock(&opts->dep_lock);
1362 if (!opts->ready)
1363 goto unlock_dep;
1364
1365 if (opts->has_dep) {
1366 if (!try_module_get(opts->dependent))
1367 goto unlock_dep;
1368 } else {
1369 ret = configfs_depend_item_unlocked(
1370 wwn->wwn_group.cg_subsys,
1371 &opts->func_inst.group.cg_item);
1372 if (ret)
1373 goto unlock_dep;
1374 }
1375
1376 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1377 ret = -ENOMEM;
1378 if (!tpg)
1379 goto unref_dep;
1380 mutex_init(&tpg->tpg_mutex);
1381 atomic_set(&tpg->tpg_port_count, 0);
1382 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1383 if (!tpg->workqueue)
1384 goto free_tpg;
1385
1386 tpg->tport = tport;
1387 tpg->tport_tpgt = tpgt;
1388
1389
1390
1391
1392
1393 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1394 if (ret < 0)
1395 goto free_workqueue;
1396
1397 tpg_instances[i].tpg = tpg;
1398 tpg->fi = tpg_instances[i].func_inst;
1399 mutex_unlock(&opts->dep_lock);
1400 mutex_unlock(&tpg_instances_lock);
1401 return &tpg->se_tpg;
1402
1403free_workqueue:
1404 destroy_workqueue(tpg->workqueue);
1405free_tpg:
1406 kfree(tpg);
1407unref_dep:
1408 if (opts->has_dep)
1409 module_put(opts->dependent);
1410 else
1411 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1412unlock_dep:
1413 mutex_unlock(&opts->dep_lock);
1414unlock_inst:
1415 mutex_unlock(&tpg_instances_lock);
1416
1417 return ERR_PTR(ret);
1418}
1419
1420static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1421
1422static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1423{
1424 struct usbg_tpg *tpg = container_of(se_tpg,
1425 struct usbg_tpg, se_tpg);
1426 unsigned i;
1427 struct f_tcm_opts *opts;
1428
1429 tcm_usbg_drop_nexus(tpg);
1430 core_tpg_deregister(se_tpg);
1431 destroy_workqueue(tpg->workqueue);
1432
1433 mutex_lock(&tpg_instances_lock);
1434 for (i = 0; i < TPG_INSTANCES; ++i)
1435 if (tpg_instances[i].tpg == tpg)
1436 break;
1437 if (i < TPG_INSTANCES) {
1438 tpg_instances[i].tpg = NULL;
1439 opts = container_of(tpg_instances[i].func_inst,
1440 struct f_tcm_opts, func_inst);
1441 mutex_lock(&opts->dep_lock);
1442 if (opts->has_dep)
1443 module_put(opts->dependent);
1444 else
1445 configfs_undepend_item_unlocked(
1446 &opts->func_inst.group.cg_item);
1447 mutex_unlock(&opts->dep_lock);
1448 }
1449 mutex_unlock(&tpg_instances_lock);
1450
1451 kfree(tpg);
1452}
1453
1454static struct se_wwn *usbg_make_tport(
1455 struct target_fabric_configfs *tf,
1456 struct config_group *group,
1457 const char *name)
1458{
1459 struct usbg_tport *tport;
1460 const char *wnn_name;
1461 u64 wwpn = 0;
1462
1463 wnn_name = usbg_check_wwn(name);
1464 if (!wnn_name)
1465 return ERR_PTR(-EINVAL);
1466
1467 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1468 if (!(tport))
1469 return ERR_PTR(-ENOMEM);
1470
1471 tport->tport_wwpn = wwpn;
1472 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1473 return &tport->tport_wwn;
1474}
1475
1476static void usbg_drop_tport(struct se_wwn *wwn)
1477{
1478 struct usbg_tport *tport = container_of(wwn,
1479 struct usbg_tport, tport_wwn);
1480 kfree(tport);
1481}
1482
1483
1484
1485
1486static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1487{
1488 return sprintf(page, "usb-gadget fabric module\n");
1489}
1490
1491CONFIGFS_ATTR_RO(usbg_wwn_, version);
1492
1493static struct configfs_attribute *usbg_wwn_attrs[] = {
1494 &usbg_wwn_attr_version,
1495 NULL,
1496};
1497
1498static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1499{
1500 struct se_portal_group *se_tpg = to_tpg(item);
1501 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1502
1503 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1504}
1505
1506static int usbg_attach(struct usbg_tpg *);
1507static void usbg_detach(struct usbg_tpg *);
1508
1509static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1510 const char *page, size_t count)
1511{
1512 struct se_portal_group *se_tpg = to_tpg(item);
1513 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1514 bool op;
1515 ssize_t ret;
1516
1517 ret = strtobool(page, &op);
1518 if (ret)
1519 return ret;
1520
1521 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1522 return -EINVAL;
1523
1524 if (op)
1525 ret = usbg_attach(tpg);
1526 else
1527 usbg_detach(tpg);
1528 if (ret)
1529 return ret;
1530
1531 tpg->gadget_connect = op;
1532
1533 return count;
1534}
1535
1536static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1537{
1538 struct se_portal_group *se_tpg = to_tpg(item);
1539 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1540 struct tcm_usbg_nexus *tv_nexus;
1541 ssize_t ret;
1542
1543 mutex_lock(&tpg->tpg_mutex);
1544 tv_nexus = tpg->tpg_nexus;
1545 if (!tv_nexus) {
1546 ret = -ENODEV;
1547 goto out;
1548 }
1549 ret = snprintf(page, PAGE_SIZE, "%s\n",
1550 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1551out:
1552 mutex_unlock(&tpg->tpg_mutex);
1553 return ret;
1554}
1555
1556static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1557 struct se_session *se_sess, void *p)
1558{
1559 struct usbg_tpg *tpg = container_of(se_tpg,
1560 struct usbg_tpg, se_tpg);
1561
1562 tpg->tpg_nexus = p;
1563 return 0;
1564}
1565
1566static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1567{
1568 struct tcm_usbg_nexus *tv_nexus;
1569 int ret = 0;
1570
1571 mutex_lock(&tpg->tpg_mutex);
1572 if (tpg->tpg_nexus) {
1573 ret = -EEXIST;
1574 pr_debug("tpg->tpg_nexus already exists\n");
1575 goto out_unlock;
1576 }
1577
1578 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1579 if (!tv_nexus) {
1580 ret = -ENOMEM;
1581 goto out_unlock;
1582 }
1583
1584 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1585 USB_G_DEFAULT_SESSION_TAGS,
1586 sizeof(struct usbg_cmd),
1587 TARGET_PROT_NORMAL, name,
1588 tv_nexus, usbg_alloc_sess_cb);
1589 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1590#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1591 pr_debug(MAKE_NEXUS_MSG, name);
1592#undef MAKE_NEXUS_MSG
1593 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1594 kfree(tv_nexus);
1595 }
1596
1597out_unlock:
1598 mutex_unlock(&tpg->tpg_mutex);
1599 return ret;
1600}
1601
1602static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1603{
1604 struct se_session *se_sess;
1605 struct tcm_usbg_nexus *tv_nexus;
1606 int ret = -ENODEV;
1607
1608 mutex_lock(&tpg->tpg_mutex);
1609 tv_nexus = tpg->tpg_nexus;
1610 if (!tv_nexus)
1611 goto out;
1612
1613 se_sess = tv_nexus->tvn_se_sess;
1614 if (!se_sess)
1615 goto out;
1616
1617 if (atomic_read(&tpg->tpg_port_count)) {
1618 ret = -EPERM;
1619#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1620 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1621#undef MSG
1622 goto out;
1623 }
1624
1625 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1626 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1627
1628
1629
1630 target_remove_session(se_sess);
1631 tpg->tpg_nexus = NULL;
1632
1633 kfree(tv_nexus);
1634 ret = 0;
1635out:
1636 mutex_unlock(&tpg->tpg_mutex);
1637 return ret;
1638}
1639
1640static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1641 const char *page, size_t count)
1642{
1643 struct se_portal_group *se_tpg = to_tpg(item);
1644 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1645 unsigned char i_port[USBG_NAMELEN], *ptr;
1646 int ret;
1647
1648 if (!strncmp(page, "NULL", 4)) {
1649 ret = tcm_usbg_drop_nexus(tpg);
1650 return (!ret) ? count : ret;
1651 }
1652 if (strlen(page) >= USBG_NAMELEN) {
1653
1654#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1655 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1656#undef NEXUS_STORE_MSG
1657 return -EINVAL;
1658 }
1659 snprintf(i_port, USBG_NAMELEN, "%s", page);
1660
1661 ptr = strstr(i_port, "naa.");
1662 if (!ptr) {
1663 pr_err("Missing 'naa.' prefix\n");
1664 return -EINVAL;
1665 }
1666
1667 if (i_port[strlen(i_port) - 1] == '\n')
1668 i_port[strlen(i_port) - 1] = '\0';
1669
1670 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1671 if (ret < 0)
1672 return ret;
1673 return count;
1674}
1675
1676CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1677CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1678
1679static struct configfs_attribute *usbg_base_attrs[] = {
1680 &tcm_usbg_tpg_attr_enable,
1681 &tcm_usbg_tpg_attr_nexus,
1682 NULL,
1683};
1684
1685static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1686{
1687 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1688
1689 atomic_inc(&tpg->tpg_port_count);
1690 smp_mb__after_atomic();
1691 return 0;
1692}
1693
1694static void usbg_port_unlink(struct se_portal_group *se_tpg,
1695 struct se_lun *se_lun)
1696{
1697 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1698
1699 atomic_dec(&tpg->tpg_port_count);
1700 smp_mb__after_atomic();
1701}
1702
1703static int usbg_check_stop_free(struct se_cmd *se_cmd)
1704{
1705 return target_put_sess_cmd(se_cmd);
1706}
1707
1708static const struct target_core_fabric_ops usbg_ops = {
1709 .module = THIS_MODULE,
1710 .fabric_name = "usb_gadget",
1711 .tpg_get_wwn = usbg_get_fabric_wwn,
1712 .tpg_get_tag = usbg_get_tag,
1713 .tpg_check_demo_mode = usbg_check_true,
1714 .tpg_check_demo_mode_cache = usbg_check_false,
1715 .tpg_check_demo_mode_write_protect = usbg_check_false,
1716 .tpg_check_prod_mode_write_protect = usbg_check_false,
1717 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1718 .release_cmd = usbg_release_cmd,
1719 .sess_get_index = usbg_sess_get_index,
1720 .sess_get_initiator_sid = NULL,
1721 .write_pending = usbg_send_write_request,
1722 .set_default_node_attributes = usbg_set_default_node_attrs,
1723 .get_cmd_state = usbg_get_cmd_state,
1724 .queue_data_in = usbg_send_read_response,
1725 .queue_status = usbg_send_status_response,
1726 .queue_tm_rsp = usbg_queue_tm_rsp,
1727 .aborted_task = usbg_aborted_task,
1728 .check_stop_free = usbg_check_stop_free,
1729
1730 .fabric_make_wwn = usbg_make_tport,
1731 .fabric_drop_wwn = usbg_drop_tport,
1732 .fabric_make_tpg = usbg_make_tpg,
1733 .fabric_drop_tpg = usbg_drop_tpg,
1734 .fabric_post_link = usbg_port_link,
1735 .fabric_pre_unlink = usbg_port_unlink,
1736 .fabric_init_nodeacl = usbg_init_nodeacl,
1737
1738 .tfc_wwn_attrs = usbg_wwn_attrs,
1739 .tfc_tpg_base_attrs = usbg_base_attrs,
1740};
1741
1742
1743
1744static struct usb_interface_descriptor bot_intf_desc = {
1745 .bLength = sizeof(bot_intf_desc),
1746 .bDescriptorType = USB_DT_INTERFACE,
1747 .bNumEndpoints = 2,
1748 .bAlternateSetting = USB_G_ALT_INT_BBB,
1749 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1750 .bInterfaceSubClass = USB_SC_SCSI,
1751 .bInterfaceProtocol = USB_PR_BULK,
1752};
1753
1754static struct usb_interface_descriptor uasp_intf_desc = {
1755 .bLength = sizeof(uasp_intf_desc),
1756 .bDescriptorType = USB_DT_INTERFACE,
1757 .bNumEndpoints = 4,
1758 .bAlternateSetting = USB_G_ALT_INT_UAS,
1759 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1760 .bInterfaceSubClass = USB_SC_SCSI,
1761 .bInterfaceProtocol = USB_PR_UAS,
1762};
1763
1764static struct usb_endpoint_descriptor uasp_bi_desc = {
1765 .bLength = USB_DT_ENDPOINT_SIZE,
1766 .bDescriptorType = USB_DT_ENDPOINT,
1767 .bEndpointAddress = USB_DIR_IN,
1768 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1769 .wMaxPacketSize = cpu_to_le16(512),
1770};
1771
1772static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1773 .bLength = USB_DT_ENDPOINT_SIZE,
1774 .bDescriptorType = USB_DT_ENDPOINT,
1775 .bEndpointAddress = USB_DIR_IN,
1776 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1777};
1778
1779static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1780 .bLength = sizeof(uasp_bi_pipe_desc),
1781 .bDescriptorType = USB_DT_PIPE_USAGE,
1782 .bPipeID = DATA_IN_PIPE_ID,
1783};
1784
1785static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1786 .bLength = USB_DT_ENDPOINT_SIZE,
1787 .bDescriptorType = USB_DT_ENDPOINT,
1788 .bEndpointAddress = USB_DIR_IN,
1789 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1790 .wMaxPacketSize = cpu_to_le16(1024),
1791};
1792
1793static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1794 .bLength = sizeof(uasp_bi_ep_comp_desc),
1795 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1796 .bMaxBurst = 0,
1797 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1798 .wBytesPerInterval = 0,
1799};
1800
1801static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1802 .bLength = sizeof(bot_bi_ep_comp_desc),
1803 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1804 .bMaxBurst = 0,
1805};
1806
1807static struct usb_endpoint_descriptor uasp_bo_desc = {
1808 .bLength = USB_DT_ENDPOINT_SIZE,
1809 .bDescriptorType = USB_DT_ENDPOINT,
1810 .bEndpointAddress = USB_DIR_OUT,
1811 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1812 .wMaxPacketSize = cpu_to_le16(512),
1813};
1814
1815static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1816 .bLength = USB_DT_ENDPOINT_SIZE,
1817 .bDescriptorType = USB_DT_ENDPOINT,
1818 .bEndpointAddress = USB_DIR_OUT,
1819 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1820};
1821
1822static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1823 .bLength = sizeof(uasp_bo_pipe_desc),
1824 .bDescriptorType = USB_DT_PIPE_USAGE,
1825 .bPipeID = DATA_OUT_PIPE_ID,
1826};
1827
1828static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1829 .bLength = USB_DT_ENDPOINT_SIZE,
1830 .bDescriptorType = USB_DT_ENDPOINT,
1831 .bEndpointAddress = USB_DIR_OUT,
1832 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1833 .wMaxPacketSize = cpu_to_le16(0x400),
1834};
1835
1836static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1837 .bLength = sizeof(uasp_bo_ep_comp_desc),
1838 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1839 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1840};
1841
1842static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1843 .bLength = sizeof(bot_bo_ep_comp_desc),
1844 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1845};
1846
1847static struct usb_endpoint_descriptor uasp_status_desc = {
1848 .bLength = USB_DT_ENDPOINT_SIZE,
1849 .bDescriptorType = USB_DT_ENDPOINT,
1850 .bEndpointAddress = USB_DIR_IN,
1851 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1852 .wMaxPacketSize = cpu_to_le16(512),
1853};
1854
1855static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1856 .bLength = USB_DT_ENDPOINT_SIZE,
1857 .bDescriptorType = USB_DT_ENDPOINT,
1858 .bEndpointAddress = USB_DIR_IN,
1859 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1860};
1861
1862static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1863 .bLength = sizeof(uasp_status_pipe_desc),
1864 .bDescriptorType = USB_DT_PIPE_USAGE,
1865 .bPipeID = STATUS_PIPE_ID,
1866};
1867
1868static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1869 .bLength = USB_DT_ENDPOINT_SIZE,
1870 .bDescriptorType = USB_DT_ENDPOINT,
1871 .bEndpointAddress = USB_DIR_IN,
1872 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1873 .wMaxPacketSize = cpu_to_le16(1024),
1874};
1875
1876static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1877 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1878 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1879 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1880};
1881
1882static struct usb_endpoint_descriptor uasp_cmd_desc = {
1883 .bLength = USB_DT_ENDPOINT_SIZE,
1884 .bDescriptorType = USB_DT_ENDPOINT,
1885 .bEndpointAddress = USB_DIR_OUT,
1886 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1887 .wMaxPacketSize = cpu_to_le16(512),
1888};
1889
1890static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1891 .bLength = USB_DT_ENDPOINT_SIZE,
1892 .bDescriptorType = USB_DT_ENDPOINT,
1893 .bEndpointAddress = USB_DIR_OUT,
1894 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1895};
1896
1897static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1898 .bLength = sizeof(uasp_cmd_pipe_desc),
1899 .bDescriptorType = USB_DT_PIPE_USAGE,
1900 .bPipeID = CMD_PIPE_ID,
1901};
1902
1903static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1904 .bLength = USB_DT_ENDPOINT_SIZE,
1905 .bDescriptorType = USB_DT_ENDPOINT,
1906 .bEndpointAddress = USB_DIR_OUT,
1907 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1908 .wMaxPacketSize = cpu_to_le16(1024),
1909};
1910
1911static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1912 .bLength = sizeof(uasp_cmd_comp_desc),
1913 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1914};
1915
1916static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1917 (struct usb_descriptor_header *) &bot_intf_desc,
1918 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1919 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1920
1921 (struct usb_descriptor_header *) &uasp_intf_desc,
1922 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1923 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1924 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1925 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1926 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1927 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1928 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1929 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1930 NULL,
1931};
1932
1933static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1934 (struct usb_descriptor_header *) &bot_intf_desc,
1935 (struct usb_descriptor_header *) &uasp_bi_desc,
1936 (struct usb_descriptor_header *) &uasp_bo_desc,
1937
1938 (struct usb_descriptor_header *) &uasp_intf_desc,
1939 (struct usb_descriptor_header *) &uasp_bi_desc,
1940 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1941 (struct usb_descriptor_header *) &uasp_bo_desc,
1942 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1943 (struct usb_descriptor_header *) &uasp_status_desc,
1944 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1945 (struct usb_descriptor_header *) &uasp_cmd_desc,
1946 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1947 NULL,
1948};
1949
1950static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1951 (struct usb_descriptor_header *) &bot_intf_desc,
1952 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1953 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1954 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1955 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1956
1957 (struct usb_descriptor_header *) &uasp_intf_desc,
1958 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1959 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1960 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1961 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1962 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1963 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1964 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1965 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1966 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1967 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1968 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1969 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1970 NULL,
1971};
1972
1973static struct usb_string tcm_us_strings[] = {
1974 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1975 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1976 { },
1977};
1978
1979static struct usb_gadget_strings tcm_stringtab = {
1980 .language = 0x0409,
1981 .strings = tcm_us_strings,
1982};
1983
1984static struct usb_gadget_strings *tcm_strings[] = {
1985 &tcm_stringtab,
1986 NULL,
1987};
1988
1989static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1990{
1991 struct f_uas *fu = to_f_uas(f);
1992 struct usb_string *us;
1993 struct usb_gadget *gadget = c->cdev->gadget;
1994 struct usb_ep *ep;
1995 struct f_tcm_opts *opts;
1996 int iface;
1997 int ret;
1998
1999 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2000
2001 mutex_lock(&opts->dep_lock);
2002 if (!opts->can_attach) {
2003 mutex_unlock(&opts->dep_lock);
2004 return -ENODEV;
2005 }
2006 mutex_unlock(&opts->dep_lock);
2007 us = usb_gstrings_attach(c->cdev, tcm_strings,
2008 ARRAY_SIZE(tcm_us_strings));
2009 if (IS_ERR(us))
2010 return PTR_ERR(us);
2011 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2012 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2013
2014 iface = usb_interface_id(c, f);
2015 if (iface < 0)
2016 return iface;
2017
2018 bot_intf_desc.bInterfaceNumber = iface;
2019 uasp_intf_desc.bInterfaceNumber = iface;
2020 fu->iface = iface;
2021 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2022 &uasp_bi_ep_comp_desc);
2023 if (!ep)
2024 goto ep_fail;
2025
2026 fu->ep_in = ep;
2027
2028 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2029 &uasp_bo_ep_comp_desc);
2030 if (!ep)
2031 goto ep_fail;
2032 fu->ep_out = ep;
2033
2034 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2035 &uasp_status_in_ep_comp_desc);
2036 if (!ep)
2037 goto ep_fail;
2038 fu->ep_status = ep;
2039
2040 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2041 &uasp_cmd_comp_desc);
2042 if (!ep)
2043 goto ep_fail;
2044 fu->ep_cmd = ep;
2045
2046
2047 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2048 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2049 uasp_status_desc.bEndpointAddress =
2050 uasp_ss_status_desc.bEndpointAddress;
2051 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2052
2053 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2054 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2055 uasp_fs_status_desc.bEndpointAddress =
2056 uasp_ss_status_desc.bEndpointAddress;
2057 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2058
2059 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2060 uasp_hs_function_desc, uasp_ss_function_desc,
2061 uasp_ss_function_desc);
2062 if (ret)
2063 goto ep_fail;
2064
2065 return 0;
2066ep_fail:
2067 pr_err("Can't claim all required eps\n");
2068
2069 return -ENOTSUPP;
2070}
2071
2072struct guas_setup_wq {
2073 struct work_struct work;
2074 struct f_uas *fu;
2075 unsigned int alt;
2076};
2077
2078static void tcm_delayed_set_alt(struct work_struct *wq)
2079{
2080 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2081 work);
2082 struct f_uas *fu = work->fu;
2083 int alt = work->alt;
2084
2085 kfree(work);
2086
2087 if (fu->flags & USBG_IS_BOT)
2088 bot_cleanup_old_alt(fu);
2089 if (fu->flags & USBG_IS_UAS)
2090 uasp_cleanup_old_alt(fu);
2091
2092 if (alt == USB_G_ALT_INT_BBB)
2093 bot_set_alt(fu);
2094 else if (alt == USB_G_ALT_INT_UAS)
2095 uasp_set_alt(fu);
2096 usb_composite_setup_continue(fu->function.config->cdev);
2097}
2098
2099static int tcm_get_alt(struct usb_function *f, unsigned intf)
2100{
2101 if (intf == bot_intf_desc.bInterfaceNumber)
2102 return USB_G_ALT_INT_BBB;
2103 if (intf == uasp_intf_desc.bInterfaceNumber)
2104 return USB_G_ALT_INT_UAS;
2105
2106 return -EOPNOTSUPP;
2107}
2108
2109static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2110{
2111 struct f_uas *fu = to_f_uas(f);
2112
2113 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2114 struct guas_setup_wq *work;
2115
2116 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2117 if (!work)
2118 return -ENOMEM;
2119 INIT_WORK(&work->work, tcm_delayed_set_alt);
2120 work->fu = fu;
2121 work->alt = alt;
2122 schedule_work(&work->work);
2123 return USB_GADGET_DELAYED_STATUS;
2124 }
2125 return -EOPNOTSUPP;
2126}
2127
2128static void tcm_disable(struct usb_function *f)
2129{
2130 struct f_uas *fu = to_f_uas(f);
2131
2132 if (fu->flags & USBG_IS_UAS)
2133 uasp_cleanup_old_alt(fu);
2134 else if (fu->flags & USBG_IS_BOT)
2135 bot_cleanup_old_alt(fu);
2136 fu->flags = 0;
2137}
2138
2139static int tcm_setup(struct usb_function *f,
2140 const struct usb_ctrlrequest *ctrl)
2141{
2142 struct f_uas *fu = to_f_uas(f);
2143
2144 if (!(fu->flags & USBG_IS_BOT))
2145 return -EOPNOTSUPP;
2146
2147 return usbg_bot_setup(f, ctrl);
2148}
2149
2150static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2151{
2152 return container_of(to_config_group(item), struct f_tcm_opts,
2153 func_inst.group);
2154}
2155
2156static void tcm_attr_release(struct config_item *item)
2157{
2158 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2159
2160 usb_put_function_instance(&opts->func_inst);
2161}
2162
2163static struct configfs_item_operations tcm_item_ops = {
2164 .release = tcm_attr_release,
2165};
2166
2167static const struct config_item_type tcm_func_type = {
2168 .ct_item_ops = &tcm_item_ops,
2169 .ct_owner = THIS_MODULE,
2170};
2171
2172static void tcm_free_inst(struct usb_function_instance *f)
2173{
2174 struct f_tcm_opts *opts;
2175 unsigned i;
2176
2177 opts = container_of(f, struct f_tcm_opts, func_inst);
2178
2179 mutex_lock(&tpg_instances_lock);
2180 for (i = 0; i < TPG_INSTANCES; ++i)
2181 if (tpg_instances[i].func_inst == f)
2182 break;
2183 if (i < TPG_INSTANCES)
2184 tpg_instances[i].func_inst = NULL;
2185 mutex_unlock(&tpg_instances_lock);
2186
2187 kfree(opts);
2188}
2189
2190static int tcm_register_callback(struct usb_function_instance *f)
2191{
2192 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2193
2194 mutex_lock(&opts->dep_lock);
2195 opts->can_attach = true;
2196 mutex_unlock(&opts->dep_lock);
2197
2198 return 0;
2199}
2200
2201static void tcm_unregister_callback(struct usb_function_instance *f)
2202{
2203 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2204
2205 mutex_lock(&opts->dep_lock);
2206 unregister_gadget_item(opts->
2207 func_inst.group.cg_item.ci_parent->ci_parent);
2208 opts->can_attach = false;
2209 mutex_unlock(&opts->dep_lock);
2210}
2211
2212static int usbg_attach(struct usbg_tpg *tpg)
2213{
2214 struct usb_function_instance *f = tpg->fi;
2215 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2216
2217 if (opts->tcm_register_callback)
2218 return opts->tcm_register_callback(f);
2219
2220 return 0;
2221}
2222
2223static void usbg_detach(struct usbg_tpg *tpg)
2224{
2225 struct usb_function_instance *f = tpg->fi;
2226 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2227
2228 if (opts->tcm_unregister_callback)
2229 opts->tcm_unregister_callback(f);
2230}
2231
2232static int tcm_set_name(struct usb_function_instance *f, const char *name)
2233{
2234 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2235
2236 pr_debug("tcm: Activating %s\n", name);
2237
2238 mutex_lock(&opts->dep_lock);
2239 opts->ready = true;
2240 mutex_unlock(&opts->dep_lock);
2241
2242 return 0;
2243}
2244
2245static struct usb_function_instance *tcm_alloc_inst(void)
2246{
2247 struct f_tcm_opts *opts;
2248 int i;
2249
2250
2251 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2252 if (!opts)
2253 return ERR_PTR(-ENOMEM);
2254
2255 mutex_lock(&tpg_instances_lock);
2256 for (i = 0; i < TPG_INSTANCES; ++i)
2257 if (!tpg_instances[i].func_inst)
2258 break;
2259
2260 if (i == TPG_INSTANCES) {
2261 mutex_unlock(&tpg_instances_lock);
2262 kfree(opts);
2263 return ERR_PTR(-EBUSY);
2264 }
2265 tpg_instances[i].func_inst = &opts->func_inst;
2266 mutex_unlock(&tpg_instances_lock);
2267
2268 mutex_init(&opts->dep_lock);
2269 opts->func_inst.set_inst_name = tcm_set_name;
2270 opts->func_inst.free_func_inst = tcm_free_inst;
2271 opts->tcm_register_callback = tcm_register_callback;
2272 opts->tcm_unregister_callback = tcm_unregister_callback;
2273
2274 config_group_init_type_name(&opts->func_inst.group, "",
2275 &tcm_func_type);
2276
2277 return &opts->func_inst;
2278}
2279
2280static void tcm_free(struct usb_function *f)
2281{
2282 struct f_uas *tcm = to_f_uas(f);
2283
2284 kfree(tcm);
2285}
2286
2287static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2288{
2289 usb_free_all_descriptors(f);
2290}
2291
2292static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2293{
2294 struct f_uas *fu;
2295 unsigned i;
2296
2297 mutex_lock(&tpg_instances_lock);
2298 for (i = 0; i < TPG_INSTANCES; ++i)
2299 if (tpg_instances[i].func_inst == fi)
2300 break;
2301 if (i == TPG_INSTANCES) {
2302 mutex_unlock(&tpg_instances_lock);
2303 return ERR_PTR(-ENODEV);
2304 }
2305
2306 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2307 if (!fu) {
2308 mutex_unlock(&tpg_instances_lock);
2309 return ERR_PTR(-ENOMEM);
2310 }
2311
2312 fu->function.name = "Target Function";
2313 fu->function.bind = tcm_bind;
2314 fu->function.unbind = tcm_unbind;
2315 fu->function.set_alt = tcm_set_alt;
2316 fu->function.get_alt = tcm_get_alt;
2317 fu->function.setup = tcm_setup;
2318 fu->function.disable = tcm_disable;
2319 fu->function.free_func = tcm_free;
2320 fu->tpg = tpg_instances[i].tpg;
2321 mutex_unlock(&tpg_instances_lock);
2322
2323 return &fu->function;
2324}
2325
2326DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2327
2328static int tcm_init(void)
2329{
2330 int ret;
2331
2332 ret = usb_function_register(&tcmusb_func);
2333 if (ret)
2334 return ret;
2335
2336 ret = target_register_template(&usbg_ops);
2337 if (ret)
2338 usb_function_unregister(&tcmusb_func);
2339
2340 return ret;
2341}
2342module_init(tcm_init);
2343
2344static void tcm_exit(void)
2345{
2346 target_unregister_template(&usbg_ops);
2347 usb_function_unregister(&tcmusb_func);
2348}
2349module_exit(tcm_exit);
2350
2351MODULE_LICENSE("GPL");
2352MODULE_AUTHOR("Sebastian Andrzej Siewior");
2353
