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[mirror_ubuntu-zesty-kernel.git] / drivers / usb / gadget / function / f_tcm.c
1 /* Target based USB-Gadget
2 *
3 * UAS protocol handling, target callbacks, configfs handling,
4 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
5 *
6 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
7 * License: GPLv2 as published by FSF.
8 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/configfs.h>
14 #include <linux/ctype.h>
15 #include <linux/usb/ch9.h>
16 #include <linux/usb/composite.h>
17 #include <linux/usb/gadget.h>
18 #include <linux/usb/storage.h>
19 #include <scsi/scsi_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
30 struct tpg_instance {
31 struct usb_function_instance *func_inst;
32 struct usbg_tpg *tpg;
33 };
34
35 static struct tpg_instance tpg_instances[TPG_INSTANCES];
36
37 static DEFINE_MUTEX(tpg_instances_lock);
38
39 static inline struct f_uas *to_f_uas(struct usb_function *f)
40 {
41 return container_of(f, struct f_uas, function);
42 }
43
44 /* Start bot.c code */
45
46 static 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
59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
60 {
61 struct usbg_cmd *cmd = req->context;
62 struct f_uas *fu = cmd->fu;
63
64 transport_generic_free_cmd(&cmd->se_cmd, 0);
65 if (req->status < 0) {
66 pr_err("ERR %s(%d)\n", __func__, __LINE__);
67 return;
68 }
69
70 /* CSW completed, wait for next CBW */
71 bot_enqueue_cmd_cbw(fu);
72 }
73
74 static 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
89 static 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
112 static 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
146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
147 {
148 struct f_uas *fu = cmd->fu;
149 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
150 int ret;
151
152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
153 if (!moved_data && cmd->data_len) {
154 /*
155 * the host wants to move data, we don't. Fill / empty
156 * the pipe and then send the csw with reside set.
157 */
158 cmd->csw_code = US_BULK_STAT_OK;
159 bot_send_bad_status(cmd);
160 return 0;
161 }
162
163 csw->Tag = cmd->bot_tag;
164 csw->Residue = cpu_to_le32(0);
165 csw->Status = US_BULK_STAT_OK;
166 fu->bot_status.req->context = cmd;
167
168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
169 if (ret)
170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
171 } else {
172 cmd->csw_code = US_BULK_STAT_FAIL;
173 bot_send_bad_status(cmd);
174 }
175 return 0;
176 }
177
178 /*
179 * Called after command (no data transfer) or after the write (to device)
180 * operation is completed
181 */
182 static int bot_send_status_response(struct usbg_cmd *cmd)
183 {
184 bool moved_data = false;
185
186 if (!cmd->is_read)
187 moved_data = true;
188 return bot_send_status(cmd, moved_data);
189 }
190
191 /* Read request completed, now we have to send the CSW */
192 static 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
202 static 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
241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
243
244 static 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);
284 cleanup:
285 return ret;
286 }
287
288 static int bot_submit_command(struct f_uas *, void *, unsigned int);
289
290 static 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
305 static 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;
343 err_queue:
344 kfree(fu->cmd.buf);
345 fu->cmd.buf = NULL;
346 err_buf:
347 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
348 err_sts:
349 usb_ep_free_request(fu->ep_out, fu->cmd.req);
350 fu->cmd.req = NULL;
351 err_cmd:
352 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
353 fu->bot_req_out = NULL;
354 err_out:
355 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
356 fu->bot_req_in = NULL;
357 err:
358 pr_err("BOT: endpoint setup failed\n");
359 return -ENOMEM;
360 }
361
362 static 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_out, 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
387 static 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;
411 err_wq:
412 usb_ep_disable(fu->ep_out);
413 err_b_out:
414 usb_ep_disable(fu->ep_in);
415 err_b_in:
416 fu->flags = USBG_IS_BOT;
417 }
418
419 static 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 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
446 * accessed. The upper limit is 0xf
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 /* XXX maybe we should remove previous requests for IN + OUT */
460 bot_enqueue_cmd_cbw(fu);
461 return 0;
462 }
463 return -ENOTSUPP;
464 }
465
466 /* Start uas.c code */
467
468 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
469 {
470 /* We have either all three allocated or none */
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
483 static 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
491 static 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
508 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
509
510 static 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->complete = uasp_status_data_cmpl;
535 stream->req_in->length = se_cmd->data_length;
536 stream->req_in->context = cmd;
537
538 cmd->state = UASP_SEND_STATUS;
539 return 0;
540 }
541
542 static void uasp_prepare_status(struct usbg_cmd *cmd)
543 {
544 struct se_cmd *se_cmd = &cmd->se_cmd;
545 struct sense_iu *iu = &cmd->sense_iu;
546 struct uas_stream *stream = cmd->stream;
547
548 cmd->state = UASP_QUEUE_COMMAND;
549 iu->iu_id = IU_ID_STATUS;
550 iu->tag = cpu_to_be16(cmd->tag);
551
552 /*
553 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
554 */
555 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
556 iu->status = se_cmd->scsi_status;
557 stream->req_status->context = cmd;
558 stream->req_status->length = se_cmd->scsi_sense_length + 16;
559 stream->req_status->buf = iu;
560 stream->req_status->complete = uasp_status_data_cmpl;
561 }
562
563 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
564 {
565 struct usbg_cmd *cmd = req->context;
566 struct uas_stream *stream = cmd->stream;
567 struct f_uas *fu = cmd->fu;
568 int ret;
569
570 if (req->status < 0)
571 goto cleanup;
572
573 switch (cmd->state) {
574 case UASP_SEND_DATA:
575 ret = uasp_prepare_r_request(cmd);
576 if (ret)
577 goto cleanup;
578 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
579 if (ret)
580 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
581 break;
582
583 case UASP_RECEIVE_DATA:
584 ret = usbg_prepare_w_request(cmd, stream->req_out);
585 if (ret)
586 goto cleanup;
587 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
588 if (ret)
589 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
590 break;
591
592 case UASP_SEND_STATUS:
593 uasp_prepare_status(cmd);
594 ret = usb_ep_queue(fu->ep_status, stream->req_status,
595 GFP_ATOMIC);
596 if (ret)
597 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
598 break;
599
600 case UASP_QUEUE_COMMAND:
601 transport_generic_free_cmd(&cmd->se_cmd, 0);
602 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
603 break;
604
605 default:
606 BUG();
607 }
608 return;
609
610 cleanup:
611 transport_generic_free_cmd(&cmd->se_cmd, 0);
612 }
613
614 static int uasp_send_status_response(struct usbg_cmd *cmd)
615 {
616 struct f_uas *fu = cmd->fu;
617 struct uas_stream *stream = cmd->stream;
618 struct sense_iu *iu = &cmd->sense_iu;
619
620 iu->tag = cpu_to_be16(cmd->tag);
621 stream->req_status->complete = uasp_status_data_cmpl;
622 stream->req_status->context = cmd;
623 cmd->fu = fu;
624 uasp_prepare_status(cmd);
625 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
626 }
627
628 static int uasp_send_read_response(struct usbg_cmd *cmd)
629 {
630 struct f_uas *fu = cmd->fu;
631 struct uas_stream *stream = cmd->stream;
632 struct sense_iu *iu = &cmd->sense_iu;
633 int ret;
634
635 cmd->fu = fu;
636
637 iu->tag = cpu_to_be16(cmd->tag);
638 if (fu->flags & USBG_USE_STREAMS) {
639
640 ret = uasp_prepare_r_request(cmd);
641 if (ret)
642 goto out;
643 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
644 if (ret) {
645 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
646 kfree(cmd->data_buf);
647 cmd->data_buf = NULL;
648 }
649
650 } else {
651
652 iu->iu_id = IU_ID_READ_READY;
653 iu->tag = cpu_to_be16(cmd->tag);
654
655 stream->req_status->complete = uasp_status_data_cmpl;
656 stream->req_status->context = cmd;
657
658 cmd->state = UASP_SEND_DATA;
659 stream->req_status->buf = iu;
660 stream->req_status->length = sizeof(struct iu);
661
662 ret = usb_ep_queue(fu->ep_status, stream->req_status,
663 GFP_ATOMIC);
664 if (ret)
665 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
666 }
667 out:
668 return ret;
669 }
670
671 static int uasp_send_write_request(struct usbg_cmd *cmd)
672 {
673 struct f_uas *fu = cmd->fu;
674 struct se_cmd *se_cmd = &cmd->se_cmd;
675 struct uas_stream *stream = cmd->stream;
676 struct sense_iu *iu = &cmd->sense_iu;
677 int ret;
678
679 init_completion(&cmd->write_complete);
680 cmd->fu = fu;
681
682 iu->tag = cpu_to_be16(cmd->tag);
683
684 if (fu->flags & USBG_USE_STREAMS) {
685
686 ret = usbg_prepare_w_request(cmd, stream->req_out);
687 if (ret)
688 goto cleanup;
689 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
690 if (ret)
691 pr_err("%s(%d)\n", __func__, __LINE__);
692
693 } else {
694
695 iu->iu_id = IU_ID_WRITE_READY;
696 iu->tag = cpu_to_be16(cmd->tag);
697
698 stream->req_status->complete = uasp_status_data_cmpl;
699 stream->req_status->context = cmd;
700
701 cmd->state = UASP_RECEIVE_DATA;
702 stream->req_status->buf = iu;
703 stream->req_status->length = sizeof(struct iu);
704
705 ret = usb_ep_queue(fu->ep_status, stream->req_status,
706 GFP_ATOMIC);
707 if (ret)
708 pr_err("%s(%d)\n", __func__, __LINE__);
709 }
710
711 wait_for_completion(&cmd->write_complete);
712 target_execute_cmd(se_cmd);
713 cleanup:
714 return ret;
715 }
716
717 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
718
719 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
720 {
721 struct f_uas *fu = req->context;
722 int ret;
723
724 if (req->status < 0)
725 return;
726
727 ret = usbg_submit_command(fu, req->buf, req->actual);
728 /*
729 * Once we tune for performance enqueue the command req here again so
730 * we can receive a second command while we processing this one. Pay
731 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
732 * don't break HS.
733 */
734 if (!ret)
735 return;
736 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
737 }
738
739 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
740 {
741 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
742 if (!stream->req_in)
743 goto out;
744
745 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
746 if (!stream->req_out)
747 goto err_out;
748
749 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
750 if (!stream->req_status)
751 goto err_sts;
752
753 return 0;
754 err_sts:
755 usb_ep_free_request(fu->ep_status, stream->req_status);
756 stream->req_status = NULL;
757 err_out:
758 usb_ep_free_request(fu->ep_out, stream->req_out);
759 stream->req_out = NULL;
760 out:
761 return -ENOMEM;
762 }
763
764 static int uasp_alloc_cmd(struct f_uas *fu)
765 {
766 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
767 if (!fu->cmd.req)
768 goto err;
769
770 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
771 if (!fu->cmd.buf)
772 goto err_buf;
773
774 fu->cmd.req->complete = uasp_cmd_complete;
775 fu->cmd.req->buf = fu->cmd.buf;
776 fu->cmd.req->length = fu->ep_cmd->maxpacket;
777 fu->cmd.req->context = fu;
778 return 0;
779
780 err_buf:
781 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
782 err:
783 return -ENOMEM;
784 }
785
786 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
787 {
788 int i;
789
790 for (i = 0; i < max_streams; i++) {
791 struct uas_stream *s = &fu->stream[i];
792
793 s->req_in->stream_id = i + 1;
794 s->req_out->stream_id = i + 1;
795 s->req_status->stream_id = i + 1;
796 }
797 }
798
799 static int uasp_prepare_reqs(struct f_uas *fu)
800 {
801 int ret;
802 int i;
803 int max_streams;
804
805 if (fu->flags & USBG_USE_STREAMS)
806 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
807 else
808 max_streams = 1;
809
810 for (i = 0; i < max_streams; i++) {
811 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
812 if (ret)
813 goto err_cleanup;
814 }
815
816 ret = uasp_alloc_cmd(fu);
817 if (ret)
818 goto err_free_stream;
819 uasp_setup_stream_res(fu, max_streams);
820
821 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
822 if (ret)
823 goto err_free_stream;
824
825 return 0;
826
827 err_free_stream:
828 uasp_free_cmdreq(fu);
829
830 err_cleanup:
831 if (i) {
832 do {
833 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
834 i--;
835 } while (i);
836 }
837 pr_err("UASP: endpoint setup failed\n");
838 return ret;
839 }
840
841 static void uasp_set_alt(struct f_uas *fu)
842 {
843 struct usb_function *f = &fu->function;
844 struct usb_gadget *gadget = f->config->cdev->gadget;
845 int ret;
846
847 fu->flags = USBG_IS_UAS;
848
849 if (gadget->speed == USB_SPEED_SUPER)
850 fu->flags |= USBG_USE_STREAMS;
851
852 config_ep_by_speed(gadget, f, fu->ep_in);
853 ret = usb_ep_enable(fu->ep_in);
854 if (ret)
855 goto err_b_in;
856
857 config_ep_by_speed(gadget, f, fu->ep_out);
858 ret = usb_ep_enable(fu->ep_out);
859 if (ret)
860 goto err_b_out;
861
862 config_ep_by_speed(gadget, f, fu->ep_cmd);
863 ret = usb_ep_enable(fu->ep_cmd);
864 if (ret)
865 goto err_cmd;
866 config_ep_by_speed(gadget, f, fu->ep_status);
867 ret = usb_ep_enable(fu->ep_status);
868 if (ret)
869 goto err_status;
870
871 ret = uasp_prepare_reqs(fu);
872 if (ret)
873 goto err_wq;
874 fu->flags |= USBG_ENABLED;
875
876 pr_info("Using the UAS protocol\n");
877 return;
878 err_wq:
879 usb_ep_disable(fu->ep_status);
880 err_status:
881 usb_ep_disable(fu->ep_cmd);
882 err_cmd:
883 usb_ep_disable(fu->ep_out);
884 err_b_out:
885 usb_ep_disable(fu->ep_in);
886 err_b_in:
887 fu->flags = 0;
888 }
889
890 static int get_cmd_dir(const unsigned char *cdb)
891 {
892 int ret;
893
894 switch (cdb[0]) {
895 case READ_6:
896 case READ_10:
897 case READ_12:
898 case READ_16:
899 case INQUIRY:
900 case MODE_SENSE:
901 case MODE_SENSE_10:
902 case SERVICE_ACTION_IN_16:
903 case MAINTENANCE_IN:
904 case PERSISTENT_RESERVE_IN:
905 case SECURITY_PROTOCOL_IN:
906 case ACCESS_CONTROL_IN:
907 case REPORT_LUNS:
908 case READ_BLOCK_LIMITS:
909 case READ_POSITION:
910 case READ_CAPACITY:
911 case READ_TOC:
912 case READ_FORMAT_CAPACITIES:
913 case REQUEST_SENSE:
914 ret = DMA_FROM_DEVICE;
915 break;
916
917 case WRITE_6:
918 case WRITE_10:
919 case WRITE_12:
920 case WRITE_16:
921 case MODE_SELECT:
922 case MODE_SELECT_10:
923 case WRITE_VERIFY:
924 case WRITE_VERIFY_12:
925 case PERSISTENT_RESERVE_OUT:
926 case MAINTENANCE_OUT:
927 case SECURITY_PROTOCOL_OUT:
928 case ACCESS_CONTROL_OUT:
929 ret = DMA_TO_DEVICE;
930 break;
931 case ALLOW_MEDIUM_REMOVAL:
932 case TEST_UNIT_READY:
933 case SYNCHRONIZE_CACHE:
934 case START_STOP:
935 case ERASE:
936 case REZERO_UNIT:
937 case SEEK_10:
938 case SPACE:
939 case VERIFY:
940 case WRITE_FILEMARKS:
941 ret = DMA_NONE;
942 break;
943 default:
944 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
945 pr_warn(CMD_DIR_MSG, cdb[0]);
946 #undef CMD_DIR_MSG
947 ret = -EINVAL;
948 }
949 return ret;
950 }
951
952 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
953 {
954 struct usbg_cmd *cmd = req->context;
955 struct se_cmd *se_cmd = &cmd->se_cmd;
956
957 if (req->status < 0) {
958 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
959 goto cleanup;
960 }
961
962 if (req->num_sgs == 0) {
963 sg_copy_from_buffer(se_cmd->t_data_sg,
964 se_cmd->t_data_nents,
965 cmd->data_buf,
966 se_cmd->data_length);
967 }
968
969 complete(&cmd->write_complete);
970 return;
971
972 cleanup:
973 transport_generic_free_cmd(&cmd->se_cmd, 0);
974 }
975
976 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
977 {
978 struct se_cmd *se_cmd = &cmd->se_cmd;
979 struct f_uas *fu = cmd->fu;
980 struct usb_gadget *gadget = fuas_to_gadget(fu);
981
982 if (!gadget->sg_supported) {
983 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
984 if (!cmd->data_buf)
985 return -ENOMEM;
986
987 req->buf = cmd->data_buf;
988 } else {
989 req->buf = NULL;
990 req->num_sgs = se_cmd->t_data_nents;
991 req->sg = se_cmd->t_data_sg;
992 }
993
994 req->complete = usbg_data_write_cmpl;
995 req->length = se_cmd->data_length;
996 req->context = cmd;
997 return 0;
998 }
999
1000 static int usbg_send_status_response(struct se_cmd *se_cmd)
1001 {
1002 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1003 se_cmd);
1004 struct f_uas *fu = cmd->fu;
1005
1006 if (fu->flags & USBG_IS_BOT)
1007 return bot_send_status_response(cmd);
1008 else
1009 return uasp_send_status_response(cmd);
1010 }
1011
1012 static int usbg_send_write_request(struct se_cmd *se_cmd)
1013 {
1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015 se_cmd);
1016 struct f_uas *fu = cmd->fu;
1017
1018 if (fu->flags & USBG_IS_BOT)
1019 return bot_send_write_request(cmd);
1020 else
1021 return uasp_send_write_request(cmd);
1022 }
1023
1024 static int usbg_send_read_response(struct se_cmd *se_cmd)
1025 {
1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027 se_cmd);
1028 struct f_uas *fu = cmd->fu;
1029
1030 if (fu->flags & USBG_IS_BOT)
1031 return bot_send_read_response(cmd);
1032 else
1033 return uasp_send_read_response(cmd);
1034 }
1035
1036 static void usbg_cmd_work(struct work_struct *work)
1037 {
1038 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1039 struct se_cmd *se_cmd;
1040 struct tcm_usbg_nexus *tv_nexus;
1041 struct usbg_tpg *tpg;
1042 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1043
1044 se_cmd = &cmd->se_cmd;
1045 tpg = cmd->fu->tpg;
1046 tv_nexus = tpg->tpg_nexus;
1047 dir = get_cmd_dir(cmd->cmd_buf);
1048 if (dir < 0) {
1049 transport_init_se_cmd(se_cmd,
1050 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1051 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1052 cmd->prio_attr, cmd->sense_iu.sense);
1053 goto out;
1054 }
1055
1056 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1057 cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1058 cmd->prio_attr, dir, flags) < 0)
1059 goto out;
1060
1061 return;
1062
1063 out:
1064 transport_send_check_condition_and_sense(se_cmd,
1065 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1066 transport_generic_free_cmd(&cmd->se_cmd, 0);
1067 }
1068
1069 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1070 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1071 {
1072 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1073 struct usbg_cmd *cmd;
1074 int tag;
1075
1076 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, GFP_ATOMIC);
1077 if (tag < 0)
1078 return ERR_PTR(-ENOMEM);
1079
1080 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1081 memset(cmd, 0, sizeof(*cmd));
1082 cmd->se_cmd.map_tag = tag;
1083 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1084 cmd->fu = fu;
1085
1086 return cmd;
1087 }
1088
1089 static void usbg_release_cmd(struct se_cmd *);
1090
1091 static int usbg_submit_command(struct f_uas *fu,
1092 void *cmdbuf, unsigned int len)
1093 {
1094 struct command_iu *cmd_iu = cmdbuf;
1095 struct usbg_cmd *cmd;
1096 struct usbg_tpg *tpg = fu->tpg;
1097 struct tcm_usbg_nexus *tv_nexus = tpg->tpg_nexus;
1098 u32 cmd_len;
1099 u16 scsi_tag;
1100
1101 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1102 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1103 return -EINVAL;
1104 }
1105
1106 tv_nexus = tpg->tpg_nexus;
1107 if (!tv_nexus) {
1108 pr_err("Missing nexus, ignoring command\n");
1109 return -EINVAL;
1110 }
1111
1112 cmd_len = (cmd_iu->len & ~0x3) + 16;
1113 if (cmd_len > USBG_MAX_CMD)
1114 return -EINVAL;
1115
1116 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1117 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1118 if (IS_ERR(cmd)) {
1119 pr_err("usbg_get_cmd failed\n");
1120 return -ENOMEM;
1121 }
1122 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1123
1124 if (fu->flags & USBG_USE_STREAMS) {
1125 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1126 goto err;
1127 if (!cmd->tag)
1128 cmd->stream = &fu->stream[0];
1129 else
1130 cmd->stream = &fu->stream[cmd->tag - 1];
1131 } else {
1132 cmd->stream = &fu->stream[0];
1133 }
1134
1135 switch (cmd_iu->prio_attr & 0x7) {
1136 case UAS_HEAD_TAG:
1137 cmd->prio_attr = TCM_HEAD_TAG;
1138 break;
1139 case UAS_ORDERED_TAG:
1140 cmd->prio_attr = TCM_ORDERED_TAG;
1141 break;
1142 case UAS_ACA:
1143 cmd->prio_attr = TCM_ACA_TAG;
1144 break;
1145 default:
1146 pr_debug_once("Unsupported prio_attr: %02x.\n",
1147 cmd_iu->prio_attr);
1148 case UAS_SIMPLE_TAG:
1149 cmd->prio_attr = TCM_SIMPLE_TAG;
1150 break;
1151 }
1152
1153 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1154
1155 INIT_WORK(&cmd->work, usbg_cmd_work);
1156 queue_work(tpg->workqueue, &cmd->work);
1157
1158 return 0;
1159 err:
1160 usbg_release_cmd(&cmd->se_cmd);
1161 return -EINVAL;
1162 }
1163
1164 static void bot_cmd_work(struct work_struct *work)
1165 {
1166 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167 struct se_cmd *se_cmd;
1168 struct tcm_usbg_nexus *tv_nexus;
1169 struct usbg_tpg *tpg;
1170 int dir;
1171
1172 se_cmd = &cmd->se_cmd;
1173 tpg = cmd->fu->tpg;
1174 tv_nexus = tpg->tpg_nexus;
1175 dir = get_cmd_dir(cmd->cmd_buf);
1176 if (dir < 0) {
1177 transport_init_se_cmd(se_cmd,
1178 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180 cmd->prio_attr, cmd->sense_iu.sense);
1181 goto out;
1182 }
1183
1184 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1185 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1186 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187 goto out;
1188
1189 return;
1190
1191 out:
1192 transport_send_check_condition_and_sense(se_cmd,
1193 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194 transport_generic_free_cmd(&cmd->se_cmd, 0);
1195 }
1196
1197 static int bot_submit_command(struct f_uas *fu,
1198 void *cmdbuf, unsigned int len)
1199 {
1200 struct bulk_cb_wrap *cbw = cmdbuf;
1201 struct usbg_cmd *cmd;
1202 struct usbg_tpg *tpg = fu->tpg;
1203 struct tcm_usbg_nexus *tv_nexus;
1204 u32 cmd_len;
1205
1206 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1207 pr_err("Wrong signature on CBW\n");
1208 return -EINVAL;
1209 }
1210 if (len != 31) {
1211 pr_err("Wrong length for CBW\n");
1212 return -EINVAL;
1213 }
1214
1215 cmd_len = cbw->Length;
1216 if (cmd_len < 1 || cmd_len > 16)
1217 return -EINVAL;
1218
1219 tv_nexus = tpg->tpg_nexus;
1220 if (!tv_nexus) {
1221 pr_err("Missing nexus, ignoring command\n");
1222 return -ENODEV;
1223 }
1224
1225 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1226 if (IS_ERR(cmd)) {
1227 pr_err("usbg_get_cmd failed\n");
1228 return -ENOMEM;
1229 }
1230 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1231
1232 cmd->bot_tag = cbw->Tag;
1233 cmd->prio_attr = TCM_SIMPLE_TAG;
1234 cmd->unpacked_lun = cbw->Lun;
1235 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1236 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1237 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1238
1239 INIT_WORK(&cmd->work, bot_cmd_work);
1240 queue_work(tpg->workqueue, &cmd->work);
1241
1242 return 0;
1243 }
1244
1245 /* Start fabric.c code */
1246
1247 static int usbg_check_true(struct se_portal_group *se_tpg)
1248 {
1249 return 1;
1250 }
1251
1252 static int usbg_check_false(struct se_portal_group *se_tpg)
1253 {
1254 return 0;
1255 }
1256
1257 static char *usbg_get_fabric_name(void)
1258 {
1259 return "usb_gadget";
1260 }
1261
1262 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1263 {
1264 struct usbg_tpg *tpg = container_of(se_tpg,
1265 struct usbg_tpg, se_tpg);
1266 struct usbg_tport *tport = tpg->tport;
1267
1268 return &tport->tport_name[0];
1269 }
1270
1271 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1272 {
1273 struct usbg_tpg *tpg = container_of(se_tpg,
1274 struct usbg_tpg, se_tpg);
1275 return tpg->tport_tpgt;
1276 }
1277
1278 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1279 {
1280 return 1;
1281 }
1282
1283 static void usbg_release_cmd(struct se_cmd *se_cmd)
1284 {
1285 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1286 se_cmd);
1287 struct se_session *se_sess = se_cmd->se_sess;
1288
1289 kfree(cmd->data_buf);
1290 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
1291 }
1292
1293 static int usbg_shutdown_session(struct se_session *se_sess)
1294 {
1295 return 0;
1296 }
1297
1298 static void usbg_close_session(struct se_session *se_sess)
1299 {
1300 }
1301
1302 static u32 usbg_sess_get_index(struct se_session *se_sess)
1303 {
1304 return 0;
1305 }
1306
1307 /*
1308 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1309 */
1310 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1311 {
1312 return 0;
1313 }
1314
1315 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1316 {
1317 }
1318
1319 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1320 {
1321 return 0;
1322 }
1323
1324 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1325 {
1326 }
1327
1328 static void usbg_aborted_task(struct se_cmd *se_cmd)
1329 {
1330 }
1331
1332 static const char *usbg_check_wwn(const char *name)
1333 {
1334 const char *n;
1335 unsigned int len;
1336
1337 n = strstr(name, "naa.");
1338 if (!n)
1339 return NULL;
1340 n += 4;
1341 len = strlen(n);
1342 if (len == 0 || len > USBG_NAMELEN - 1)
1343 return NULL;
1344 return n;
1345 }
1346
1347 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1348 {
1349 if (!usbg_check_wwn(name))
1350 return -EINVAL;
1351 return 0;
1352 }
1353
1354 static struct se_portal_group *usbg_make_tpg(
1355 struct se_wwn *wwn,
1356 struct config_group *group,
1357 const char *name)
1358 {
1359 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1360 tport_wwn);
1361 struct usbg_tpg *tpg;
1362 unsigned long tpgt;
1363 int ret;
1364 struct f_tcm_opts *opts;
1365 unsigned i;
1366
1367 if (strstr(name, "tpgt_") != name)
1368 return ERR_PTR(-EINVAL);
1369 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1370 return ERR_PTR(-EINVAL);
1371 ret = -ENODEV;
1372 mutex_lock(&tpg_instances_lock);
1373 for (i = 0; i < TPG_INSTANCES; ++i)
1374 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1375 break;
1376 if (i == TPG_INSTANCES)
1377 goto unlock_inst;
1378
1379 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1380 func_inst);
1381 mutex_lock(&opts->dep_lock);
1382 if (!opts->ready)
1383 goto unlock_dep;
1384
1385 if (opts->has_dep) {
1386 if (!try_module_get(opts->dependent))
1387 goto unlock_dep;
1388 } else {
1389 ret = configfs_depend_item_unlocked(
1390 group->cg_subsys,
1391 &opts->func_inst.group.cg_item);
1392 if (ret)
1393 goto unlock_dep;
1394 }
1395
1396 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1397 ret = -ENOMEM;
1398 if (!tpg)
1399 goto unref_dep;
1400 mutex_init(&tpg->tpg_mutex);
1401 atomic_set(&tpg->tpg_port_count, 0);
1402 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1403 if (!tpg->workqueue)
1404 goto free_tpg;
1405
1406 tpg->tport = tport;
1407 tpg->tport_tpgt = tpgt;
1408
1409 /*
1410 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1411 * pretend to be SAS..
1412 */
1413 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1414 if (ret < 0)
1415 goto free_workqueue;
1416
1417 tpg_instances[i].tpg = tpg;
1418 tpg->fi = tpg_instances[i].func_inst;
1419 mutex_unlock(&opts->dep_lock);
1420 mutex_unlock(&tpg_instances_lock);
1421 return &tpg->se_tpg;
1422
1423 free_workqueue:
1424 destroy_workqueue(tpg->workqueue);
1425 free_tpg:
1426 kfree(tpg);
1427 unref_dep:
1428 if (opts->has_dep)
1429 module_put(opts->dependent);
1430 else
1431 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1432 unlock_dep:
1433 mutex_unlock(&opts->dep_lock);
1434 unlock_inst:
1435 mutex_unlock(&tpg_instances_lock);
1436
1437 return ERR_PTR(ret);
1438 }
1439
1440 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1441
1442 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1443 {
1444 struct usbg_tpg *tpg = container_of(se_tpg,
1445 struct usbg_tpg, se_tpg);
1446 unsigned i;
1447 struct f_tcm_opts *opts;
1448
1449 tcm_usbg_drop_nexus(tpg);
1450 core_tpg_deregister(se_tpg);
1451 destroy_workqueue(tpg->workqueue);
1452
1453 mutex_lock(&tpg_instances_lock);
1454 for (i = 0; i < TPG_INSTANCES; ++i)
1455 if (tpg_instances[i].tpg == tpg)
1456 break;
1457 if (i < TPG_INSTANCES)
1458 tpg_instances[i].tpg = NULL;
1459 opts = container_of(tpg_instances[i].func_inst,
1460 struct f_tcm_opts, func_inst);
1461 mutex_lock(&opts->dep_lock);
1462 if (opts->has_dep)
1463 module_put(opts->dependent);
1464 else
1465 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1466 mutex_unlock(&opts->dep_lock);
1467 mutex_unlock(&tpg_instances_lock);
1468
1469 kfree(tpg);
1470 }
1471
1472 static struct se_wwn *usbg_make_tport(
1473 struct target_fabric_configfs *tf,
1474 struct config_group *group,
1475 const char *name)
1476 {
1477 struct usbg_tport *tport;
1478 const char *wnn_name;
1479 u64 wwpn = 0;
1480
1481 wnn_name = usbg_check_wwn(name);
1482 if (!wnn_name)
1483 return ERR_PTR(-EINVAL);
1484
1485 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1486 if (!(tport))
1487 return ERR_PTR(-ENOMEM);
1488
1489 tport->tport_wwpn = wwpn;
1490 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1491 return &tport->tport_wwn;
1492 }
1493
1494 static void usbg_drop_tport(struct se_wwn *wwn)
1495 {
1496 struct usbg_tport *tport = container_of(wwn,
1497 struct usbg_tport, tport_wwn);
1498 kfree(tport);
1499 }
1500
1501 /*
1502 * If somebody feels like dropping the version property, go ahead.
1503 */
1504 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1505 {
1506 return sprintf(page, "usb-gadget fabric module\n");
1507 }
1508
1509 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1510
1511 static struct configfs_attribute *usbg_wwn_attrs[] = {
1512 &usbg_wwn_attr_version,
1513 NULL,
1514 };
1515
1516 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1517 {
1518 struct se_portal_group *se_tpg = to_tpg(item);
1519 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1520
1521 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1522 }
1523
1524 static int usbg_attach(struct usbg_tpg *);
1525 static void usbg_detach(struct usbg_tpg *);
1526
1527 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1528 const char *page, size_t count)
1529 {
1530 struct se_portal_group *se_tpg = to_tpg(item);
1531 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1532 bool op;
1533 ssize_t ret;
1534
1535 ret = strtobool(page, &op);
1536 if (ret)
1537 return ret;
1538
1539 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1540 return -EINVAL;
1541
1542 if (op)
1543 ret = usbg_attach(tpg);
1544 else
1545 usbg_detach(tpg);
1546 if (ret)
1547 return ret;
1548
1549 tpg->gadget_connect = op;
1550
1551 return count;
1552 }
1553
1554 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1555 {
1556 struct se_portal_group *se_tpg = to_tpg(item);
1557 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1558 struct tcm_usbg_nexus *tv_nexus;
1559 ssize_t ret;
1560
1561 mutex_lock(&tpg->tpg_mutex);
1562 tv_nexus = tpg->tpg_nexus;
1563 if (!tv_nexus) {
1564 ret = -ENODEV;
1565 goto out;
1566 }
1567 ret = snprintf(page, PAGE_SIZE, "%s\n",
1568 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1569 out:
1570 mutex_unlock(&tpg->tpg_mutex);
1571 return ret;
1572 }
1573
1574 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1575 struct se_session *se_sess, void *p)
1576 {
1577 struct usbg_tpg *tpg = container_of(se_tpg,
1578 struct usbg_tpg, se_tpg);
1579
1580 tpg->tpg_nexus = p;
1581 return 0;
1582 }
1583
1584 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1585 {
1586 struct tcm_usbg_nexus *tv_nexus;
1587 int ret = 0;
1588
1589 mutex_lock(&tpg->tpg_mutex);
1590 if (tpg->tpg_nexus) {
1591 ret = -EEXIST;
1592 pr_debug("tpg->tpg_nexus already exists\n");
1593 goto out_unlock;
1594 }
1595
1596 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1597 if (!tv_nexus) {
1598 ret = -ENOMEM;
1599 goto out_unlock;
1600 }
1601
1602 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1603 USB_G_DEFAULT_SESSION_TAGS,
1604 sizeof(struct usbg_cmd),
1605 TARGET_PROT_NORMAL, name,
1606 tv_nexus, usbg_alloc_sess_cb);
1607 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1608 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1609 pr_debug(MAKE_NEXUS_MSG, name);
1610 #undef MAKE_NEXUS_MSG
1611 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1612 kfree(tv_nexus);
1613 }
1614
1615 out_unlock:
1616 mutex_unlock(&tpg->tpg_mutex);
1617 return ret;
1618 }
1619
1620 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1621 {
1622 struct se_session *se_sess;
1623 struct tcm_usbg_nexus *tv_nexus;
1624 int ret = -ENODEV;
1625
1626 mutex_lock(&tpg->tpg_mutex);
1627 tv_nexus = tpg->tpg_nexus;
1628 if (!tv_nexus)
1629 goto out;
1630
1631 se_sess = tv_nexus->tvn_se_sess;
1632 if (!se_sess)
1633 goto out;
1634
1635 if (atomic_read(&tpg->tpg_port_count)) {
1636 ret = -EPERM;
1637 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1638 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1639 #undef MSG
1640 goto out;
1641 }
1642
1643 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1644 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1645 /*
1646 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1647 */
1648 transport_deregister_session(tv_nexus->tvn_se_sess);
1649 tpg->tpg_nexus = NULL;
1650
1651 kfree(tv_nexus);
1652 ret = 0;
1653 out:
1654 mutex_unlock(&tpg->tpg_mutex);
1655 return ret;
1656 }
1657
1658 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1659 const char *page, size_t count)
1660 {
1661 struct se_portal_group *se_tpg = to_tpg(item);
1662 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1663 unsigned char i_port[USBG_NAMELEN], *ptr;
1664 int ret;
1665
1666 if (!strncmp(page, "NULL", 4)) {
1667 ret = tcm_usbg_drop_nexus(tpg);
1668 return (!ret) ? count : ret;
1669 }
1670 if (strlen(page) >= USBG_NAMELEN) {
1671
1672 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1673 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1674 #undef NEXUS_STORE_MSG
1675 return -EINVAL;
1676 }
1677 snprintf(i_port, USBG_NAMELEN, "%s", page);
1678
1679 ptr = strstr(i_port, "naa.");
1680 if (!ptr) {
1681 pr_err("Missing 'naa.' prefix\n");
1682 return -EINVAL;
1683 }
1684
1685 if (i_port[strlen(i_port) - 1] == '\n')
1686 i_port[strlen(i_port) - 1] = '\0';
1687
1688 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1689 if (ret < 0)
1690 return ret;
1691 return count;
1692 }
1693
1694 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1695 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1696
1697 static struct configfs_attribute *usbg_base_attrs[] = {
1698 &tcm_usbg_tpg_attr_enable,
1699 &tcm_usbg_tpg_attr_nexus,
1700 NULL,
1701 };
1702
1703 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1704 {
1705 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1706
1707 atomic_inc(&tpg->tpg_port_count);
1708 smp_mb__after_atomic();
1709 return 0;
1710 }
1711
1712 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1713 struct se_lun *se_lun)
1714 {
1715 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1716
1717 atomic_dec(&tpg->tpg_port_count);
1718 smp_mb__after_atomic();
1719 }
1720
1721 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1722 {
1723 return target_put_sess_cmd(se_cmd);
1724 }
1725
1726 static const struct target_core_fabric_ops usbg_ops = {
1727 .module = THIS_MODULE,
1728 .name = "usb_gadget",
1729 .get_fabric_name = usbg_get_fabric_name,
1730 .tpg_get_wwn = usbg_get_fabric_wwn,
1731 .tpg_get_tag = usbg_get_tag,
1732 .tpg_check_demo_mode = usbg_check_true,
1733 .tpg_check_demo_mode_cache = usbg_check_false,
1734 .tpg_check_demo_mode_write_protect = usbg_check_false,
1735 .tpg_check_prod_mode_write_protect = usbg_check_false,
1736 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1737 .release_cmd = usbg_release_cmd,
1738 .shutdown_session = usbg_shutdown_session,
1739 .close_session = usbg_close_session,
1740 .sess_get_index = usbg_sess_get_index,
1741 .sess_get_initiator_sid = NULL,
1742 .write_pending = usbg_send_write_request,
1743 .write_pending_status = usbg_write_pending_status,
1744 .set_default_node_attributes = usbg_set_default_node_attrs,
1745 .get_cmd_state = usbg_get_cmd_state,
1746 .queue_data_in = usbg_send_read_response,
1747 .queue_status = usbg_send_status_response,
1748 .queue_tm_rsp = usbg_queue_tm_rsp,
1749 .aborted_task = usbg_aborted_task,
1750 .check_stop_free = usbg_check_stop_free,
1751
1752 .fabric_make_wwn = usbg_make_tport,
1753 .fabric_drop_wwn = usbg_drop_tport,
1754 .fabric_make_tpg = usbg_make_tpg,
1755 .fabric_drop_tpg = usbg_drop_tpg,
1756 .fabric_post_link = usbg_port_link,
1757 .fabric_pre_unlink = usbg_port_unlink,
1758 .fabric_init_nodeacl = usbg_init_nodeacl,
1759
1760 .tfc_wwn_attrs = usbg_wwn_attrs,
1761 .tfc_tpg_base_attrs = usbg_base_attrs,
1762 };
1763
1764 /* Start gadget.c code */
1765
1766 static struct usb_interface_descriptor bot_intf_desc = {
1767 .bLength = sizeof(bot_intf_desc),
1768 .bDescriptorType = USB_DT_INTERFACE,
1769 .bNumEndpoints = 2,
1770 .bAlternateSetting = USB_G_ALT_INT_BBB,
1771 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1772 .bInterfaceSubClass = USB_SC_SCSI,
1773 .bInterfaceProtocol = USB_PR_BULK,
1774 };
1775
1776 static struct usb_interface_descriptor uasp_intf_desc = {
1777 .bLength = sizeof(uasp_intf_desc),
1778 .bDescriptorType = USB_DT_INTERFACE,
1779 .bNumEndpoints = 4,
1780 .bAlternateSetting = USB_G_ALT_INT_UAS,
1781 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1782 .bInterfaceSubClass = USB_SC_SCSI,
1783 .bInterfaceProtocol = USB_PR_UAS,
1784 };
1785
1786 static struct usb_endpoint_descriptor uasp_bi_desc = {
1787 .bLength = USB_DT_ENDPOINT_SIZE,
1788 .bDescriptorType = USB_DT_ENDPOINT,
1789 .bEndpointAddress = USB_DIR_IN,
1790 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1791 .wMaxPacketSize = cpu_to_le16(512),
1792 };
1793
1794 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1795 .bLength = USB_DT_ENDPOINT_SIZE,
1796 .bDescriptorType = USB_DT_ENDPOINT,
1797 .bEndpointAddress = USB_DIR_IN,
1798 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1799 };
1800
1801 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1802 .bLength = sizeof(uasp_bi_pipe_desc),
1803 .bDescriptorType = USB_DT_PIPE_USAGE,
1804 .bPipeID = DATA_IN_PIPE_ID,
1805 };
1806
1807 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1808 .bLength = USB_DT_ENDPOINT_SIZE,
1809 .bDescriptorType = USB_DT_ENDPOINT,
1810 .bEndpointAddress = USB_DIR_IN,
1811 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1812 .wMaxPacketSize = cpu_to_le16(1024),
1813 };
1814
1815 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1816 .bLength = sizeof(uasp_bi_ep_comp_desc),
1817 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1818 .bMaxBurst = 0,
1819 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1820 .wBytesPerInterval = 0,
1821 };
1822
1823 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1824 .bLength = sizeof(bot_bi_ep_comp_desc),
1825 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1826 .bMaxBurst = 0,
1827 };
1828
1829 static struct usb_endpoint_descriptor uasp_bo_desc = {
1830 .bLength = USB_DT_ENDPOINT_SIZE,
1831 .bDescriptorType = USB_DT_ENDPOINT,
1832 .bEndpointAddress = USB_DIR_OUT,
1833 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1834 .wMaxPacketSize = cpu_to_le16(512),
1835 };
1836
1837 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1838 .bLength = USB_DT_ENDPOINT_SIZE,
1839 .bDescriptorType = USB_DT_ENDPOINT,
1840 .bEndpointAddress = USB_DIR_OUT,
1841 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1842 };
1843
1844 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1845 .bLength = sizeof(uasp_bo_pipe_desc),
1846 .bDescriptorType = USB_DT_PIPE_USAGE,
1847 .bPipeID = DATA_OUT_PIPE_ID,
1848 };
1849
1850 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1851 .bLength = USB_DT_ENDPOINT_SIZE,
1852 .bDescriptorType = USB_DT_ENDPOINT,
1853 .bEndpointAddress = USB_DIR_OUT,
1854 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1855 .wMaxPacketSize = cpu_to_le16(0x400),
1856 };
1857
1858 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1859 .bLength = sizeof(uasp_bo_ep_comp_desc),
1860 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1861 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1862 };
1863
1864 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1865 .bLength = sizeof(bot_bo_ep_comp_desc),
1866 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1867 };
1868
1869 static struct usb_endpoint_descriptor uasp_status_desc = {
1870 .bLength = USB_DT_ENDPOINT_SIZE,
1871 .bDescriptorType = USB_DT_ENDPOINT,
1872 .bEndpointAddress = USB_DIR_IN,
1873 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1874 .wMaxPacketSize = cpu_to_le16(512),
1875 };
1876
1877 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1878 .bLength = USB_DT_ENDPOINT_SIZE,
1879 .bDescriptorType = USB_DT_ENDPOINT,
1880 .bEndpointAddress = USB_DIR_IN,
1881 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1882 };
1883
1884 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1885 .bLength = sizeof(uasp_status_pipe_desc),
1886 .bDescriptorType = USB_DT_PIPE_USAGE,
1887 .bPipeID = STATUS_PIPE_ID,
1888 };
1889
1890 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1891 .bLength = USB_DT_ENDPOINT_SIZE,
1892 .bDescriptorType = USB_DT_ENDPOINT,
1893 .bEndpointAddress = USB_DIR_IN,
1894 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1895 .wMaxPacketSize = cpu_to_le16(1024),
1896 };
1897
1898 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1899 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1900 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1901 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1902 };
1903
1904 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1905 .bLength = USB_DT_ENDPOINT_SIZE,
1906 .bDescriptorType = USB_DT_ENDPOINT,
1907 .bEndpointAddress = USB_DIR_OUT,
1908 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1909 .wMaxPacketSize = cpu_to_le16(512),
1910 };
1911
1912 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1913 .bLength = USB_DT_ENDPOINT_SIZE,
1914 .bDescriptorType = USB_DT_ENDPOINT,
1915 .bEndpointAddress = USB_DIR_OUT,
1916 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1917 };
1918
1919 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1920 .bLength = sizeof(uasp_cmd_pipe_desc),
1921 .bDescriptorType = USB_DT_PIPE_USAGE,
1922 .bPipeID = CMD_PIPE_ID,
1923 };
1924
1925 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1926 .bLength = USB_DT_ENDPOINT_SIZE,
1927 .bDescriptorType = USB_DT_ENDPOINT,
1928 .bEndpointAddress = USB_DIR_OUT,
1929 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1930 .wMaxPacketSize = cpu_to_le16(1024),
1931 };
1932
1933 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1934 .bLength = sizeof(uasp_cmd_comp_desc),
1935 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1936 };
1937
1938 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1939 (struct usb_descriptor_header *) &bot_intf_desc,
1940 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1941 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1942
1943 (struct usb_descriptor_header *) &uasp_intf_desc,
1944 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1945 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1946 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1947 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1948 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1949 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1950 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1951 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1952 NULL,
1953 };
1954
1955 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1956 (struct usb_descriptor_header *) &bot_intf_desc,
1957 (struct usb_descriptor_header *) &uasp_bi_desc,
1958 (struct usb_descriptor_header *) &uasp_bo_desc,
1959
1960 (struct usb_descriptor_header *) &uasp_intf_desc,
1961 (struct usb_descriptor_header *) &uasp_bi_desc,
1962 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1963 (struct usb_descriptor_header *) &uasp_bo_desc,
1964 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1965 (struct usb_descriptor_header *) &uasp_status_desc,
1966 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1967 (struct usb_descriptor_header *) &uasp_cmd_desc,
1968 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1969 NULL,
1970 };
1971
1972 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1973 (struct usb_descriptor_header *) &bot_intf_desc,
1974 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1975 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1976 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1977 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1978
1979 (struct usb_descriptor_header *) &uasp_intf_desc,
1980 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1981 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1982 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1983 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1984 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1985 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1986 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1987 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1988 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1989 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1990 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1991 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1992 NULL,
1993 };
1994
1995 static struct usb_string tcm_us_strings[] = {
1996 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1997 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1998 { },
1999 };
2000
2001 static struct usb_gadget_strings tcm_stringtab = {
2002 .language = 0x0409,
2003 .strings = tcm_us_strings,
2004 };
2005
2006 static struct usb_gadget_strings *tcm_strings[] = {
2007 &tcm_stringtab,
2008 NULL,
2009 };
2010
2011 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
2012 {
2013 struct f_uas *fu = to_f_uas(f);
2014 struct usb_string *us;
2015 struct usb_gadget *gadget = c->cdev->gadget;
2016 struct usb_ep *ep;
2017 struct f_tcm_opts *opts;
2018 int iface;
2019 int ret;
2020
2021 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2022
2023 mutex_lock(&opts->dep_lock);
2024 if (!opts->can_attach) {
2025 mutex_unlock(&opts->dep_lock);
2026 return -ENODEV;
2027 }
2028 mutex_unlock(&opts->dep_lock);
2029 us = usb_gstrings_attach(c->cdev, tcm_strings,
2030 ARRAY_SIZE(tcm_us_strings));
2031 if (IS_ERR(us))
2032 return PTR_ERR(us);
2033 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2034 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2035
2036 iface = usb_interface_id(c, f);
2037 if (iface < 0)
2038 return iface;
2039
2040 bot_intf_desc.bInterfaceNumber = iface;
2041 uasp_intf_desc.bInterfaceNumber = iface;
2042 fu->iface = iface;
2043 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2044 &uasp_bi_ep_comp_desc);
2045 if (!ep)
2046 goto ep_fail;
2047
2048 fu->ep_in = ep;
2049
2050 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2051 &uasp_bo_ep_comp_desc);
2052 if (!ep)
2053 goto ep_fail;
2054 fu->ep_out = ep;
2055
2056 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2057 &uasp_status_in_ep_comp_desc);
2058 if (!ep)
2059 goto ep_fail;
2060 fu->ep_status = ep;
2061
2062 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2063 &uasp_cmd_comp_desc);
2064 if (!ep)
2065 goto ep_fail;
2066 fu->ep_cmd = ep;
2067
2068 /* Assume endpoint addresses are the same for both speeds */
2069 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2070 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2071 uasp_status_desc.bEndpointAddress =
2072 uasp_ss_status_desc.bEndpointAddress;
2073 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2074
2075 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2076 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2077 uasp_fs_status_desc.bEndpointAddress =
2078 uasp_ss_status_desc.bEndpointAddress;
2079 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2080
2081 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2082 uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2083 if (ret)
2084 goto ep_fail;
2085
2086 return 0;
2087 ep_fail:
2088 pr_err("Can't claim all required eps\n");
2089
2090 return -ENOTSUPP;
2091 }
2092
2093 struct guas_setup_wq {
2094 struct work_struct work;
2095 struct f_uas *fu;
2096 unsigned int alt;
2097 };
2098
2099 static void tcm_delayed_set_alt(struct work_struct *wq)
2100 {
2101 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2102 work);
2103 struct f_uas *fu = work->fu;
2104 int alt = work->alt;
2105
2106 kfree(work);
2107
2108 if (fu->flags & USBG_IS_BOT)
2109 bot_cleanup_old_alt(fu);
2110 if (fu->flags & USBG_IS_UAS)
2111 uasp_cleanup_old_alt(fu);
2112
2113 if (alt == USB_G_ALT_INT_BBB)
2114 bot_set_alt(fu);
2115 else if (alt == USB_G_ALT_INT_UAS)
2116 uasp_set_alt(fu);
2117 usb_composite_setup_continue(fu->function.config->cdev);
2118 }
2119
2120 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2121 {
2122 struct f_uas *fu = to_f_uas(f);
2123
2124 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2125 struct guas_setup_wq *work;
2126
2127 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2128 if (!work)
2129 return -ENOMEM;
2130 INIT_WORK(&work->work, tcm_delayed_set_alt);
2131 work->fu = fu;
2132 work->alt = alt;
2133 schedule_work(&work->work);
2134 return USB_GADGET_DELAYED_STATUS;
2135 }
2136 return -EOPNOTSUPP;
2137 }
2138
2139 static void tcm_disable(struct usb_function *f)
2140 {
2141 struct f_uas *fu = to_f_uas(f);
2142
2143 if (fu->flags & USBG_IS_UAS)
2144 uasp_cleanup_old_alt(fu);
2145 else if (fu->flags & USBG_IS_BOT)
2146 bot_cleanup_old_alt(fu);
2147 fu->flags = 0;
2148 }
2149
2150 static int tcm_setup(struct usb_function *f,
2151 const struct usb_ctrlrequest *ctrl)
2152 {
2153 struct f_uas *fu = to_f_uas(f);
2154
2155 if (!(fu->flags & USBG_IS_BOT))
2156 return -EOPNOTSUPP;
2157
2158 return usbg_bot_setup(f, ctrl);
2159 }
2160
2161 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2162 {
2163 return container_of(to_config_group(item), struct f_tcm_opts,
2164 func_inst.group);
2165 }
2166
2167 static void tcm_attr_release(struct config_item *item)
2168 {
2169 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2170
2171 usb_put_function_instance(&opts->func_inst);
2172 }
2173
2174 static struct configfs_item_operations tcm_item_ops = {
2175 .release = tcm_attr_release,
2176 };
2177
2178 static struct config_item_type tcm_func_type = {
2179 .ct_item_ops = &tcm_item_ops,
2180 .ct_owner = THIS_MODULE,
2181 };
2182
2183 static void tcm_free_inst(struct usb_function_instance *f)
2184 {
2185 struct f_tcm_opts *opts;
2186 unsigned i;
2187
2188 opts = container_of(f, struct f_tcm_opts, func_inst);
2189
2190 mutex_lock(&tpg_instances_lock);
2191 for (i = 0; i < TPG_INSTANCES; ++i)
2192 if (tpg_instances[i].func_inst == f)
2193 break;
2194 if (i < TPG_INSTANCES)
2195 tpg_instances[i].func_inst = NULL;
2196 mutex_unlock(&tpg_instances_lock);
2197
2198 kfree(opts);
2199 }
2200
2201 static int tcm_register_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 opts->can_attach = true;
2207 mutex_unlock(&opts->dep_lock);
2208
2209 return 0;
2210 }
2211
2212 static void tcm_unregister_callback(struct usb_function_instance *f)
2213 {
2214 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2215
2216 mutex_lock(&opts->dep_lock);
2217 unregister_gadget_item(opts->
2218 func_inst.group.cg_item.ci_parent->ci_parent);
2219 opts->can_attach = false;
2220 mutex_unlock(&opts->dep_lock);
2221 }
2222
2223 static int usbg_attach(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_register_callback)
2229 return opts->tcm_register_callback(f);
2230
2231 return 0;
2232 }
2233
2234 static void usbg_detach(struct usbg_tpg *tpg)
2235 {
2236 struct usb_function_instance *f = tpg->fi;
2237 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2238
2239 if (opts->tcm_unregister_callback)
2240 opts->tcm_unregister_callback(f);
2241 }
2242
2243 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2244 {
2245 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2246
2247 pr_debug("tcm: Activating %s\n", name);
2248
2249 mutex_lock(&opts->dep_lock);
2250 opts->ready = true;
2251 mutex_unlock(&opts->dep_lock);
2252
2253 return 0;
2254 }
2255
2256 static struct usb_function_instance *tcm_alloc_inst(void)
2257 {
2258 struct f_tcm_opts *opts;
2259 int i;
2260
2261
2262 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2263 if (!opts)
2264 return ERR_PTR(-ENOMEM);
2265
2266 mutex_lock(&tpg_instances_lock);
2267 for (i = 0; i < TPG_INSTANCES; ++i)
2268 if (!tpg_instances[i].func_inst)
2269 break;
2270
2271 if (i == TPG_INSTANCES) {
2272 mutex_unlock(&tpg_instances_lock);
2273 kfree(opts);
2274 return ERR_PTR(-EBUSY);
2275 }
2276 tpg_instances[i].func_inst = &opts->func_inst;
2277 mutex_unlock(&tpg_instances_lock);
2278
2279 mutex_init(&opts->dep_lock);
2280 opts->func_inst.set_inst_name = tcm_set_name;
2281 opts->func_inst.free_func_inst = tcm_free_inst;
2282 opts->tcm_register_callback = tcm_register_callback;
2283 opts->tcm_unregister_callback = tcm_unregister_callback;
2284
2285 config_group_init_type_name(&opts->func_inst.group, "",
2286 &tcm_func_type);
2287
2288 return &opts->func_inst;
2289 }
2290
2291 static void tcm_free(struct usb_function *f)
2292 {
2293 struct f_uas *tcm = to_f_uas(f);
2294
2295 kfree(tcm);
2296 }
2297
2298 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2299 {
2300 usb_free_all_descriptors(f);
2301 }
2302
2303 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2304 {
2305 struct f_uas *fu;
2306 unsigned i;
2307
2308 mutex_lock(&tpg_instances_lock);
2309 for (i = 0; i < TPG_INSTANCES; ++i)
2310 if (tpg_instances[i].func_inst == fi)
2311 break;
2312 if (i == TPG_INSTANCES) {
2313 mutex_unlock(&tpg_instances_lock);
2314 return ERR_PTR(-ENODEV);
2315 }
2316
2317 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2318 if (!fu) {
2319 mutex_unlock(&tpg_instances_lock);
2320 return ERR_PTR(-ENOMEM);
2321 }
2322
2323 fu->function.name = "Target Function";
2324 fu->function.bind = tcm_bind;
2325 fu->function.unbind = tcm_unbind;
2326 fu->function.set_alt = tcm_set_alt;
2327 fu->function.setup = tcm_setup;
2328 fu->function.disable = tcm_disable;
2329 fu->function.free_func = tcm_free;
2330 fu->tpg = tpg_instances[i].tpg;
2331 mutex_unlock(&tpg_instances_lock);
2332
2333 return &fu->function;
2334 }
2335
2336 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2337
2338 static int tcm_init(void)
2339 {
2340 int ret;
2341
2342 ret = usb_function_register(&tcmusb_func);
2343 if (ret)
2344 return ret;
2345
2346 ret = target_register_template(&usbg_ops);
2347 if (ret)
2348 usb_function_unregister(&tcmusb_func);
2349
2350 return ret;
2351 }
2352 module_init(tcm_init);
2353
2354 static void tcm_exit(void)
2355 {
2356 target_unregister_template(&usbg_ops);
2357 usb_function_unregister(&tcmusb_func);
2358 }
2359 module_exit(tcm_exit);
2360
2361 MODULE_LICENSE("GPL");
2362 MODULE_AUTHOR("Sebastian Andrzej Siewior");
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