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gadget/r8a66597: remove conditional compilation of clk code
[deliverable/linux.git] / drivers / usb / gadget / tcm_usb_gadget.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.h>
20 #include <scsi/scsi_tcq.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/target_core_fabric_configfs.h>
24 #include <target/target_core_configfs.h>
25 #include <target/configfs_macros.h>
26 #include <asm/unaligned.h>
27
28 #include "usbstring.c"
29 #include "epautoconf.c"
30 #include "config.c"
31 #include "composite.c"
32
33 #include "tcm_usb_gadget.h"
34
35 static struct target_fabric_configfs *usbg_fabric_configfs;
36
37 static inline struct f_uas *to_f_uas(struct usb_function *f)
38 {
39 return container_of(f, struct f_uas, function);
40 }
41
42 static void usbg_cmd_release(struct kref *);
43
44 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
45 {
46 kref_put(&cmd->ref, usbg_cmd_release);
47 }
48
49 /* Start bot.c code */
50
51 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
52 {
53 int ret;
54
55 if (fu->flags & USBG_BOT_CMD_PEND)
56 return 0;
57
58 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
59 if (!ret)
60 fu->flags |= USBG_BOT_CMD_PEND;
61 return ret;
62 }
63
64 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
65 {
66 struct usbg_cmd *cmd = req->context;
67 struct f_uas *fu = cmd->fu;
68
69 usbg_cleanup_cmd(cmd);
70 if (req->status < 0) {
71 pr_err("ERR %s(%d)\n", __func__, __LINE__);
72 return;
73 }
74
75 /* CSW completed, wait for next CBW */
76 bot_enqueue_cmd_cbw(fu);
77 }
78
79 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
80 {
81 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
82 int ret;
83 u8 *sense;
84 unsigned int csw_stat;
85
86 csw_stat = cmd->csw_code;
87
88 /*
89 * We can't send SENSE as a response. So we take ASC & ASCQ from our
90 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
91 * command where it learns why we failed.
92 */
93 sense = cmd->sense_iu.sense;
94
95 csw->Tag = cmd->bot_tag;
96 csw->Status = csw_stat;
97 fu->bot_status.req->context = cmd;
98 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
99 if (ret)
100 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
101 }
102
103 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
104 {
105 struct usbg_cmd *cmd = req->context;
106 struct f_uas *fu = cmd->fu;
107
108 if (req->status < 0)
109 pr_err("ERR %s(%d)\n", __func__, __LINE__);
110
111 if (cmd->data_len) {
112 if (cmd->data_len > ep->maxpacket) {
113 req->length = ep->maxpacket;
114 cmd->data_len -= ep->maxpacket;
115 } else {
116 req->length = cmd->data_len;
117 cmd->data_len = 0;
118 }
119
120 usb_ep_queue(ep, req, GFP_ATOMIC);
121 return ;
122 }
123 bot_enqueue_sense_code(fu, cmd);
124 }
125
126 static void bot_send_bad_status(struct usbg_cmd *cmd)
127 {
128 struct f_uas *fu = cmd->fu;
129 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
130 struct usb_request *req;
131 struct usb_ep *ep;
132
133 csw->Residue = cpu_to_le32(cmd->data_len);
134
135 if (cmd->data_len) {
136 if (cmd->is_read) {
137 ep = fu->ep_in;
138 req = fu->bot_req_in;
139 } else {
140 ep = fu->ep_out;
141 req = fu->bot_req_out;
142 }
143
144 if (cmd->data_len > fu->ep_in->maxpacket) {
145 req->length = ep->maxpacket;
146 cmd->data_len -= ep->maxpacket;
147 } else {
148 req->length = cmd->data_len;
149 cmd->data_len = 0;
150 }
151 req->complete = bot_err_compl;
152 req->context = cmd;
153 req->buf = fu->cmd.buf;
154 usb_ep_queue(ep, req, GFP_KERNEL);
155 } else {
156 bot_enqueue_sense_code(fu, cmd);
157 }
158 }
159
160 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
161 {
162 struct f_uas *fu = cmd->fu;
163 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
164 int ret;
165
166 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
167 if (!moved_data && cmd->data_len) {
168 /*
169 * the host wants to move data, we don't. Fill / empty
170 * the pipe and then send the csw with reside set.
171 */
172 cmd->csw_code = US_BULK_STAT_OK;
173 bot_send_bad_status(cmd);
174 return 0;
175 }
176
177 csw->Tag = cmd->bot_tag;
178 csw->Residue = cpu_to_le32(0);
179 csw->Status = US_BULK_STAT_OK;
180 fu->bot_status.req->context = cmd;
181
182 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
183 if (ret)
184 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
185 } else {
186 cmd->csw_code = US_BULK_STAT_FAIL;
187 bot_send_bad_status(cmd);
188 }
189 return 0;
190 }
191
192 /*
193 * Called after command (no data transfer) or after the write (to device)
194 * operation is completed
195 */
196 static int bot_send_status_response(struct usbg_cmd *cmd)
197 {
198 bool moved_data = false;
199
200 if (!cmd->is_read)
201 moved_data = true;
202 return bot_send_status(cmd, moved_data);
203 }
204
205 /* Read request completed, now we have to send the CSW */
206 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
207 {
208 struct usbg_cmd *cmd = req->context;
209
210 if (req->status < 0)
211 pr_err("ERR %s(%d)\n", __func__, __LINE__);
212
213 bot_send_status(cmd, true);
214 }
215
216 static int bot_send_read_response(struct usbg_cmd *cmd)
217 {
218 struct f_uas *fu = cmd->fu;
219 struct se_cmd *se_cmd = &cmd->se_cmd;
220 struct usb_gadget *gadget = fuas_to_gadget(fu);
221 int ret;
222
223 if (!cmd->data_len) {
224 cmd->csw_code = US_BULK_STAT_PHASE;
225 bot_send_bad_status(cmd);
226 return 0;
227 }
228
229 if (!gadget->sg_supported) {
230 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
231 if (!cmd->data_buf)
232 return -ENOMEM;
233
234 sg_copy_to_buffer(se_cmd->t_data_sg,
235 se_cmd->t_data_nents,
236 cmd->data_buf,
237 se_cmd->data_length);
238
239 fu->bot_req_in->buf = cmd->data_buf;
240 } else {
241 fu->bot_req_in->buf = NULL;
242 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
243 fu->bot_req_in->sg = se_cmd->t_data_sg;
244 }
245
246 fu->bot_req_in->complete = bot_read_compl;
247 fu->bot_req_in->length = se_cmd->data_length;
248 fu->bot_req_in->context = cmd;
249 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
250 if (ret)
251 pr_err("%s(%d)\n", __func__, __LINE__);
252 return 0;
253 }
254
255 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
256 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
257
258 static int bot_send_write_request(struct usbg_cmd *cmd)
259 {
260 struct f_uas *fu = cmd->fu;
261 struct se_cmd *se_cmd = &cmd->se_cmd;
262 struct usb_gadget *gadget = fuas_to_gadget(fu);
263 int ret;
264
265 init_completion(&cmd->write_complete);
266 cmd->fu = fu;
267
268 if (!cmd->data_len) {
269 cmd->csw_code = US_BULK_STAT_PHASE;
270 return -EINVAL;
271 }
272
273 if (!gadget->sg_supported) {
274 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
275 if (!cmd->data_buf)
276 return -ENOMEM;
277
278 fu->bot_req_out->buf = cmd->data_buf;
279 } else {
280 fu->bot_req_out->buf = NULL;
281 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
282 fu->bot_req_out->sg = se_cmd->t_data_sg;
283 }
284
285 fu->bot_req_out->complete = usbg_data_write_cmpl;
286 fu->bot_req_out->length = se_cmd->data_length;
287 fu->bot_req_out->context = cmd;
288
289 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
290 if (ret)
291 goto cleanup;
292 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
293 if (ret)
294 pr_err("%s(%d)\n", __func__, __LINE__);
295
296 wait_for_completion(&cmd->write_complete);
297 target_execute_cmd(se_cmd);
298 cleanup:
299 return ret;
300 }
301
302 static int bot_submit_command(struct f_uas *, void *, unsigned int);
303
304 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
305 {
306 struct f_uas *fu = req->context;
307 int ret;
308
309 fu->flags &= ~USBG_BOT_CMD_PEND;
310
311 if (req->status < 0)
312 return;
313
314 ret = bot_submit_command(fu, req->buf, req->actual);
315 if (ret)
316 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
317 }
318
319 static int bot_prepare_reqs(struct f_uas *fu)
320 {
321 int ret;
322
323 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
324 if (!fu->bot_req_in)
325 goto err;
326
327 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
328 if (!fu->bot_req_out)
329 goto err_out;
330
331 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
332 if (!fu->cmd.req)
333 goto err_cmd;
334
335 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
336 if (!fu->bot_status.req)
337 goto err_sts;
338
339 fu->bot_status.req->buf = &fu->bot_status.csw;
340 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
341 fu->bot_status.req->complete = bot_status_complete;
342 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
343
344 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
345 if (!fu->cmd.buf)
346 goto err_buf;
347
348 fu->cmd.req->complete = bot_cmd_complete;
349 fu->cmd.req->buf = fu->cmd.buf;
350 fu->cmd.req->length = fu->ep_out->maxpacket;
351 fu->cmd.req->context = fu;
352
353 ret = bot_enqueue_cmd_cbw(fu);
354 if (ret)
355 goto err_queue;
356 return 0;
357 err_queue:
358 kfree(fu->cmd.buf);
359 fu->cmd.buf = NULL;
360 err_buf:
361 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
362 err_sts:
363 usb_ep_free_request(fu->ep_out, fu->cmd.req);
364 fu->cmd.req = NULL;
365 err_cmd:
366 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
367 fu->bot_req_out = NULL;
368 err_out:
369 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
370 fu->bot_req_in = NULL;
371 err:
372 pr_err("BOT: endpoint setup failed\n");
373 return -ENOMEM;
374 }
375
376 void bot_cleanup_old_alt(struct f_uas *fu)
377 {
378 if (!(fu->flags & USBG_ENABLED))
379 return;
380
381 usb_ep_disable(fu->ep_in);
382 usb_ep_disable(fu->ep_out);
383
384 if (!fu->bot_req_in)
385 return;
386
387 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
388 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
389 usb_ep_free_request(fu->ep_out, fu->cmd.req);
390 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
391
392 kfree(fu->cmd.buf);
393
394 fu->bot_req_in = NULL;
395 fu->bot_req_out = NULL;
396 fu->cmd.req = NULL;
397 fu->bot_status.req = NULL;
398 fu->cmd.buf = NULL;
399 }
400
401 static void bot_set_alt(struct f_uas *fu)
402 {
403 struct usb_function *f = &fu->function;
404 struct usb_gadget *gadget = f->config->cdev->gadget;
405 int ret;
406
407 fu->flags = USBG_IS_BOT;
408
409 config_ep_by_speed(gadget, f, fu->ep_in);
410 ret = usb_ep_enable(fu->ep_in);
411 if (ret)
412 goto err_b_in;
413
414 config_ep_by_speed(gadget, f, fu->ep_out);
415 ret = usb_ep_enable(fu->ep_out);
416 if (ret)
417 goto err_b_out;
418
419 ret = bot_prepare_reqs(fu);
420 if (ret)
421 goto err_wq;
422 fu->flags |= USBG_ENABLED;
423 pr_info("Using the BOT protocol\n");
424 return;
425 err_wq:
426 usb_ep_disable(fu->ep_out);
427 err_b_out:
428 usb_ep_disable(fu->ep_in);
429 err_b_in:
430 fu->flags = USBG_IS_BOT;
431 }
432
433 static int usbg_bot_setup(struct usb_function *f,
434 const struct usb_ctrlrequest *ctrl)
435 {
436 struct f_uas *fu = to_f_uas(f);
437 struct usb_composite_dev *cdev = f->config->cdev;
438 u16 w_value = le16_to_cpu(ctrl->wValue);
439 u16 w_length = le16_to_cpu(ctrl->wLength);
440 int luns;
441 u8 *ret_lun;
442
443 switch (ctrl->bRequest) {
444 case US_BULK_GET_MAX_LUN:
445 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
446 USB_RECIP_INTERFACE))
447 return -ENOTSUPP;
448
449 if (w_length < 1)
450 return -EINVAL;
451 if (w_value != 0)
452 return -EINVAL;
453 luns = atomic_read(&fu->tpg->tpg_port_count);
454 if (!luns) {
455 pr_err("No LUNs configured?\n");
456 return -EINVAL;
457 }
458 /*
459 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
460 * accessed. The upper limit is 0xf
461 */
462 luns--;
463 if (luns > 0xf) {
464 pr_info_once("Limiting the number of luns to 16\n");
465 luns = 0xf;
466 }
467 ret_lun = cdev->req->buf;
468 *ret_lun = luns;
469 cdev->req->length = 1;
470 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
471 break;
472
473 case US_BULK_RESET_REQUEST:
474 /* XXX maybe we should remove previous requests for IN + OUT */
475 bot_enqueue_cmd_cbw(fu);
476 return 0;
477 break;
478 };
479 return -ENOTSUPP;
480 }
481
482 /* Start uas.c code */
483
484 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
485 {
486 /* We have either all three allocated or none */
487 if (!stream->req_in)
488 return;
489
490 usb_ep_free_request(fu->ep_in, stream->req_in);
491 usb_ep_free_request(fu->ep_out, stream->req_out);
492 usb_ep_free_request(fu->ep_status, stream->req_status);
493
494 stream->req_in = NULL;
495 stream->req_out = NULL;
496 stream->req_status = NULL;
497 }
498
499 static void uasp_free_cmdreq(struct f_uas *fu)
500 {
501 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
502 kfree(fu->cmd.buf);
503 fu->cmd.req = NULL;
504 fu->cmd.buf = NULL;
505 }
506
507 static void uasp_cleanup_old_alt(struct f_uas *fu)
508 {
509 int i;
510
511 if (!(fu->flags & USBG_ENABLED))
512 return;
513
514 usb_ep_disable(fu->ep_in);
515 usb_ep_disable(fu->ep_out);
516 usb_ep_disable(fu->ep_status);
517 usb_ep_disable(fu->ep_cmd);
518
519 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
520 uasp_cleanup_one_stream(fu, &fu->stream[i]);
521 uasp_free_cmdreq(fu);
522 }
523
524 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
525
526 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
527 {
528 struct se_cmd *se_cmd = &cmd->se_cmd;
529 struct f_uas *fu = cmd->fu;
530 struct usb_gadget *gadget = fuas_to_gadget(fu);
531 struct uas_stream *stream = cmd->stream;
532
533 if (!gadget->sg_supported) {
534 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
535 if (!cmd->data_buf)
536 return -ENOMEM;
537
538 sg_copy_to_buffer(se_cmd->t_data_sg,
539 se_cmd->t_data_nents,
540 cmd->data_buf,
541 se_cmd->data_length);
542
543 stream->req_in->buf = cmd->data_buf;
544 } else {
545 stream->req_in->buf = NULL;
546 stream->req_in->num_sgs = se_cmd->t_data_nents;
547 stream->req_in->sg = se_cmd->t_data_sg;
548 }
549
550 stream->req_in->complete = uasp_status_data_cmpl;
551 stream->req_in->length = se_cmd->data_length;
552 stream->req_in->context = cmd;
553
554 cmd->state = UASP_SEND_STATUS;
555 return 0;
556 }
557
558 static void uasp_prepare_status(struct usbg_cmd *cmd)
559 {
560 struct se_cmd *se_cmd = &cmd->se_cmd;
561 struct sense_iu *iu = &cmd->sense_iu;
562 struct uas_stream *stream = cmd->stream;
563
564 cmd->state = UASP_QUEUE_COMMAND;
565 iu->iu_id = IU_ID_STATUS;
566 iu->tag = cpu_to_be16(cmd->tag);
567
568 /*
569 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
570 */
571 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
572 iu->status = se_cmd->scsi_status;
573 stream->req_status->context = cmd;
574 stream->req_status->length = se_cmd->scsi_sense_length + 16;
575 stream->req_status->buf = iu;
576 stream->req_status->complete = uasp_status_data_cmpl;
577 }
578
579 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
580 {
581 struct usbg_cmd *cmd = req->context;
582 struct uas_stream *stream = cmd->stream;
583 struct f_uas *fu = cmd->fu;
584 int ret;
585
586 if (req->status < 0)
587 goto cleanup;
588
589 switch (cmd->state) {
590 case UASP_SEND_DATA:
591 ret = uasp_prepare_r_request(cmd);
592 if (ret)
593 goto cleanup;
594 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
595 if (ret)
596 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
597 break;
598
599 case UASP_RECEIVE_DATA:
600 ret = usbg_prepare_w_request(cmd, stream->req_out);
601 if (ret)
602 goto cleanup;
603 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
604 if (ret)
605 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
606 break;
607
608 case UASP_SEND_STATUS:
609 uasp_prepare_status(cmd);
610 ret = usb_ep_queue(fu->ep_status, stream->req_status,
611 GFP_ATOMIC);
612 if (ret)
613 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
614 break;
615
616 case UASP_QUEUE_COMMAND:
617 usbg_cleanup_cmd(cmd);
618 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
619 break;
620
621 default:
622 BUG();
623 };
624 return;
625
626 cleanup:
627 usbg_cleanup_cmd(cmd);
628 }
629
630 static int uasp_send_status_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
636 iu->tag = cpu_to_be16(cmd->tag);
637 stream->req_status->complete = uasp_status_data_cmpl;
638 stream->req_status->context = cmd;
639 cmd->fu = fu;
640 uasp_prepare_status(cmd);
641 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
642 }
643
644 static int uasp_send_read_response(struct usbg_cmd *cmd)
645 {
646 struct f_uas *fu = cmd->fu;
647 struct uas_stream *stream = cmd->stream;
648 struct sense_iu *iu = &cmd->sense_iu;
649 int ret;
650
651 cmd->fu = fu;
652
653 iu->tag = cpu_to_be16(cmd->tag);
654 if (fu->flags & USBG_USE_STREAMS) {
655
656 ret = uasp_prepare_r_request(cmd);
657 if (ret)
658 goto out;
659 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
660 if (ret) {
661 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
662 kfree(cmd->data_buf);
663 cmd->data_buf = NULL;
664 }
665
666 } else {
667
668 iu->iu_id = IU_ID_READ_READY;
669 iu->tag = cpu_to_be16(cmd->tag);
670
671 stream->req_status->complete = uasp_status_data_cmpl;
672 stream->req_status->context = cmd;
673
674 cmd->state = UASP_SEND_DATA;
675 stream->req_status->buf = iu;
676 stream->req_status->length = sizeof(struct iu);
677
678 ret = usb_ep_queue(fu->ep_status, stream->req_status,
679 GFP_ATOMIC);
680 if (ret)
681 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
682 }
683 out:
684 return ret;
685 }
686
687 static int uasp_send_write_request(struct usbg_cmd *cmd)
688 {
689 struct f_uas *fu = cmd->fu;
690 struct se_cmd *se_cmd = &cmd->se_cmd;
691 struct uas_stream *stream = cmd->stream;
692 struct sense_iu *iu = &cmd->sense_iu;
693 int ret;
694
695 init_completion(&cmd->write_complete);
696 cmd->fu = fu;
697
698 iu->tag = cpu_to_be16(cmd->tag);
699
700 if (fu->flags & USBG_USE_STREAMS) {
701
702 ret = usbg_prepare_w_request(cmd, stream->req_out);
703 if (ret)
704 goto cleanup;
705 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
706 if (ret)
707 pr_err("%s(%d)\n", __func__, __LINE__);
708
709 } else {
710
711 iu->iu_id = IU_ID_WRITE_READY;
712 iu->tag = cpu_to_be16(cmd->tag);
713
714 stream->req_status->complete = uasp_status_data_cmpl;
715 stream->req_status->context = cmd;
716
717 cmd->state = UASP_RECEIVE_DATA;
718 stream->req_status->buf = iu;
719 stream->req_status->length = sizeof(struct iu);
720
721 ret = usb_ep_queue(fu->ep_status, stream->req_status,
722 GFP_ATOMIC);
723 if (ret)
724 pr_err("%s(%d)\n", __func__, __LINE__);
725 }
726
727 wait_for_completion(&cmd->write_complete);
728 target_execute_cmd(se_cmd);
729 cleanup:
730 return ret;
731 }
732
733 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
734
735 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
736 {
737 struct f_uas *fu = req->context;
738 int ret;
739
740 if (req->status < 0)
741 return;
742
743 ret = usbg_submit_command(fu, req->buf, req->actual);
744 /*
745 * Once we tune for performance enqueue the command req here again so
746 * we can receive a second command while we processing this one. Pay
747 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
748 * don't break HS.
749 */
750 if (!ret)
751 return;
752 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
753 }
754
755 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
756 {
757 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
758 if (!stream->req_in)
759 goto out;
760
761 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
762 if (!stream->req_out)
763 goto err_out;
764
765 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
766 if (!stream->req_status)
767 goto err_sts;
768
769 return 0;
770 err_sts:
771 usb_ep_free_request(fu->ep_status, stream->req_status);
772 stream->req_status = NULL;
773 err_out:
774 usb_ep_free_request(fu->ep_out, stream->req_out);
775 stream->req_out = NULL;
776 out:
777 return -ENOMEM;
778 }
779
780 static int uasp_alloc_cmd(struct f_uas *fu)
781 {
782 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
783 if (!fu->cmd.req)
784 goto err;
785
786 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
787 if (!fu->cmd.buf)
788 goto err_buf;
789
790 fu->cmd.req->complete = uasp_cmd_complete;
791 fu->cmd.req->buf = fu->cmd.buf;
792 fu->cmd.req->length = fu->ep_cmd->maxpacket;
793 fu->cmd.req->context = fu;
794 return 0;
795
796 err_buf:
797 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
798 err:
799 return -ENOMEM;
800 }
801
802 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
803 {
804 int i;
805
806 for (i = 0; i < max_streams; i++) {
807 struct uas_stream *s = &fu->stream[i];
808
809 s->req_in->stream_id = i + 1;
810 s->req_out->stream_id = i + 1;
811 s->req_status->stream_id = i + 1;
812 }
813 }
814
815 static int uasp_prepare_reqs(struct f_uas *fu)
816 {
817 int ret;
818 int i;
819 int max_streams;
820
821 if (fu->flags & USBG_USE_STREAMS)
822 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
823 else
824 max_streams = 1;
825
826 for (i = 0; i < max_streams; i++) {
827 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
828 if (ret)
829 goto err_cleanup;
830 }
831
832 ret = uasp_alloc_cmd(fu);
833 if (ret)
834 goto err_free_stream;
835 uasp_setup_stream_res(fu, max_streams);
836
837 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
838 if (ret)
839 goto err_free_stream;
840
841 return 0;
842
843 err_free_stream:
844 uasp_free_cmdreq(fu);
845
846 err_cleanup:
847 if (i) {
848 do {
849 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
850 i--;
851 } while (i);
852 }
853 pr_err("UASP: endpoint setup failed\n");
854 return ret;
855 }
856
857 static void uasp_set_alt(struct f_uas *fu)
858 {
859 struct usb_function *f = &fu->function;
860 struct usb_gadget *gadget = f->config->cdev->gadget;
861 int ret;
862
863 fu->flags = USBG_IS_UAS;
864
865 if (gadget->speed == USB_SPEED_SUPER)
866 fu->flags |= USBG_USE_STREAMS;
867
868 config_ep_by_speed(gadget, f, fu->ep_in);
869 ret = usb_ep_enable(fu->ep_in);
870 if (ret)
871 goto err_b_in;
872
873 config_ep_by_speed(gadget, f, fu->ep_out);
874 ret = usb_ep_enable(fu->ep_out);
875 if (ret)
876 goto err_b_out;
877
878 config_ep_by_speed(gadget, f, fu->ep_cmd);
879 ret = usb_ep_enable(fu->ep_cmd);
880 if (ret)
881 goto err_cmd;
882 config_ep_by_speed(gadget, f, fu->ep_status);
883 ret = usb_ep_enable(fu->ep_status);
884 if (ret)
885 goto err_status;
886
887 ret = uasp_prepare_reqs(fu);
888 if (ret)
889 goto err_wq;
890 fu->flags |= USBG_ENABLED;
891
892 pr_info("Using the UAS protocol\n");
893 return;
894 err_wq:
895 usb_ep_disable(fu->ep_status);
896 err_status:
897 usb_ep_disable(fu->ep_cmd);
898 err_cmd:
899 usb_ep_disable(fu->ep_out);
900 err_b_out:
901 usb_ep_disable(fu->ep_in);
902 err_b_in:
903 fu->flags = 0;
904 }
905
906 static int get_cmd_dir(const unsigned char *cdb)
907 {
908 int ret;
909
910 switch (cdb[0]) {
911 case READ_6:
912 case READ_10:
913 case READ_12:
914 case READ_16:
915 case INQUIRY:
916 case MODE_SENSE:
917 case MODE_SENSE_10:
918 case SERVICE_ACTION_IN:
919 case MAINTENANCE_IN:
920 case PERSISTENT_RESERVE_IN:
921 case SECURITY_PROTOCOL_IN:
922 case ACCESS_CONTROL_IN:
923 case REPORT_LUNS:
924 case READ_BLOCK_LIMITS:
925 case READ_POSITION:
926 case READ_CAPACITY:
927 case READ_TOC:
928 case READ_FORMAT_CAPACITIES:
929 case REQUEST_SENSE:
930 ret = DMA_FROM_DEVICE;
931 break;
932
933 case WRITE_6:
934 case WRITE_10:
935 case WRITE_12:
936 case WRITE_16:
937 case MODE_SELECT:
938 case MODE_SELECT_10:
939 case WRITE_VERIFY:
940 case WRITE_VERIFY_12:
941 case PERSISTENT_RESERVE_OUT:
942 case MAINTENANCE_OUT:
943 case SECURITY_PROTOCOL_OUT:
944 case ACCESS_CONTROL_OUT:
945 ret = DMA_TO_DEVICE;
946 break;
947 case ALLOW_MEDIUM_REMOVAL:
948 case TEST_UNIT_READY:
949 case SYNCHRONIZE_CACHE:
950 case START_STOP:
951 case ERASE:
952 case REZERO_UNIT:
953 case SEEK_10:
954 case SPACE:
955 case VERIFY:
956 case WRITE_FILEMARKS:
957 ret = DMA_NONE;
958 break;
959 default:
960 pr_warn("target: Unknown data direction for SCSI Opcode "
961 "0x%02x\n", cdb[0]);
962 ret = -EINVAL;
963 }
964 return ret;
965 }
966
967 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
968 {
969 struct usbg_cmd *cmd = req->context;
970 struct se_cmd *se_cmd = &cmd->se_cmd;
971
972 if (req->status < 0) {
973 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
974 goto cleanup;
975 }
976
977 if (req->num_sgs == 0) {
978 sg_copy_from_buffer(se_cmd->t_data_sg,
979 se_cmd->t_data_nents,
980 cmd->data_buf,
981 se_cmd->data_length);
982 }
983
984 complete(&cmd->write_complete);
985 return;
986
987 cleanup:
988 usbg_cleanup_cmd(cmd);
989 }
990
991 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
992 {
993 struct se_cmd *se_cmd = &cmd->se_cmd;
994 struct f_uas *fu = cmd->fu;
995 struct usb_gadget *gadget = fuas_to_gadget(fu);
996
997 if (!gadget->sg_supported) {
998 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
999 if (!cmd->data_buf)
1000 return -ENOMEM;
1001
1002 req->buf = cmd->data_buf;
1003 } else {
1004 req->buf = NULL;
1005 req->num_sgs = se_cmd->t_data_nents;
1006 req->sg = se_cmd->t_data_sg;
1007 }
1008
1009 req->complete = usbg_data_write_cmpl;
1010 req->length = se_cmd->data_length;
1011 req->context = cmd;
1012 return 0;
1013 }
1014
1015 static int usbg_send_status_response(struct se_cmd *se_cmd)
1016 {
1017 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1018 se_cmd);
1019 struct f_uas *fu = cmd->fu;
1020
1021 if (fu->flags & USBG_IS_BOT)
1022 return bot_send_status_response(cmd);
1023 else
1024 return uasp_send_status_response(cmd);
1025 }
1026
1027 static int usbg_send_write_request(struct se_cmd *se_cmd)
1028 {
1029 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1030 se_cmd);
1031 struct f_uas *fu = cmd->fu;
1032
1033 if (fu->flags & USBG_IS_BOT)
1034 return bot_send_write_request(cmd);
1035 else
1036 return uasp_send_write_request(cmd);
1037 }
1038
1039 static int usbg_send_read_response(struct se_cmd *se_cmd)
1040 {
1041 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1042 se_cmd);
1043 struct f_uas *fu = cmd->fu;
1044
1045 if (fu->flags & USBG_IS_BOT)
1046 return bot_send_read_response(cmd);
1047 else
1048 return uasp_send_read_response(cmd);
1049 }
1050
1051 static void usbg_cmd_work(struct work_struct *work)
1052 {
1053 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1054 struct se_cmd *se_cmd;
1055 struct tcm_usbg_nexus *tv_nexus;
1056 struct usbg_tpg *tpg;
1057 int dir;
1058
1059 se_cmd = &cmd->se_cmd;
1060 tpg = cmd->fu->tpg;
1061 tv_nexus = tpg->tpg_nexus;
1062 dir = get_cmd_dir(cmd->cmd_buf);
1063 if (dir < 0) {
1064 transport_init_se_cmd(se_cmd,
1065 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1066 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1067 cmd->prio_attr, cmd->sense_iu.sense);
1068 goto out;
1069 }
1070
1071 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1072 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1073 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1074 goto out;
1075
1076 return;
1077
1078 out:
1079 transport_send_check_condition_and_sense(se_cmd,
1080 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1081 usbg_cleanup_cmd(cmd);
1082 }
1083
1084 static int usbg_submit_command(struct f_uas *fu,
1085 void *cmdbuf, unsigned int len)
1086 {
1087 struct command_iu *cmd_iu = cmdbuf;
1088 struct usbg_cmd *cmd;
1089 struct usbg_tpg *tpg;
1090 struct se_cmd *se_cmd;
1091 struct tcm_usbg_nexus *tv_nexus;
1092 u32 cmd_len;
1093 int ret;
1094
1095 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1096 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1097 return -EINVAL;
1098 }
1099
1100 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1101 if (!cmd)
1102 return -ENOMEM;
1103
1104 cmd->fu = fu;
1105
1106 /* XXX until I figure out why I can't free in on complete */
1107 kref_init(&cmd->ref);
1108 kref_get(&cmd->ref);
1109
1110 tpg = fu->tpg;
1111 cmd_len = (cmd_iu->len & ~0x3) + 16;
1112 if (cmd_len > USBG_MAX_CMD)
1113 goto err;
1114
1115 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1116
1117 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1118 if (fu->flags & USBG_USE_STREAMS) {
1119 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1120 goto err;
1121 if (!cmd->tag)
1122 cmd->stream = &fu->stream[0];
1123 else
1124 cmd->stream = &fu->stream[cmd->tag - 1];
1125 } else {
1126 cmd->stream = &fu->stream[0];
1127 }
1128
1129 tv_nexus = tpg->tpg_nexus;
1130 if (!tv_nexus) {
1131 pr_err("Missing nexus, ignoring command\n");
1132 goto err;
1133 }
1134
1135 switch (cmd_iu->prio_attr & 0x7) {
1136 case UAS_HEAD_TAG:
1137 cmd->prio_attr = MSG_HEAD_TAG;
1138 break;
1139 case UAS_ORDERED_TAG:
1140 cmd->prio_attr = MSG_ORDERED_TAG;
1141 break;
1142 case UAS_ACA:
1143 cmd->prio_attr = MSG_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 = MSG_SIMPLE_TAG;
1150 break;
1151 }
1152
1153 se_cmd = &cmd->se_cmd;
1154 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1155
1156 INIT_WORK(&cmd->work, usbg_cmd_work);
1157 ret = queue_work(tpg->workqueue, &cmd->work);
1158 if (ret < 0)
1159 goto err;
1160
1161 return 0;
1162 err:
1163 kfree(cmd);
1164 return -EINVAL;
1165 }
1166
1167 static void bot_cmd_work(struct work_struct *work)
1168 {
1169 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1170 struct se_cmd *se_cmd;
1171 struct tcm_usbg_nexus *tv_nexus;
1172 struct usbg_tpg *tpg;
1173 int dir;
1174
1175 se_cmd = &cmd->se_cmd;
1176 tpg = cmd->fu->tpg;
1177 tv_nexus = tpg->tpg_nexus;
1178 dir = get_cmd_dir(cmd->cmd_buf);
1179 if (dir < 0) {
1180 transport_init_se_cmd(se_cmd,
1181 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1182 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1183 cmd->prio_attr, cmd->sense_iu.sense);
1184 goto out;
1185 }
1186
1187 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1188 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1189 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1190 goto out;
1191
1192 return;
1193
1194 out:
1195 transport_send_check_condition_and_sense(se_cmd,
1196 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1197 usbg_cleanup_cmd(cmd);
1198 }
1199
1200 static int bot_submit_command(struct f_uas *fu,
1201 void *cmdbuf, unsigned int len)
1202 {
1203 struct bulk_cb_wrap *cbw = cmdbuf;
1204 struct usbg_cmd *cmd;
1205 struct usbg_tpg *tpg;
1206 struct se_cmd *se_cmd;
1207 struct tcm_usbg_nexus *tv_nexus;
1208 u32 cmd_len;
1209 int ret;
1210
1211 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1212 pr_err("Wrong signature on CBW\n");
1213 return -EINVAL;
1214 }
1215 if (len != 31) {
1216 pr_err("Wrong length for CBW\n");
1217 return -EINVAL;
1218 }
1219
1220 cmd_len = cbw->Length;
1221 if (cmd_len < 1 || cmd_len > 16)
1222 return -EINVAL;
1223
1224 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1225 if (!cmd)
1226 return -ENOMEM;
1227
1228 cmd->fu = fu;
1229
1230 /* XXX until I figure out why I can't free in on complete */
1231 kref_init(&cmd->ref);
1232 kref_get(&cmd->ref);
1233
1234 tpg = fu->tpg;
1235
1236 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1237
1238 cmd->bot_tag = cbw->Tag;
1239
1240 tv_nexus = tpg->tpg_nexus;
1241 if (!tv_nexus) {
1242 pr_err("Missing nexus, ignoring command\n");
1243 goto err;
1244 }
1245
1246 cmd->prio_attr = MSG_SIMPLE_TAG;
1247 se_cmd = &cmd->se_cmd;
1248 cmd->unpacked_lun = cbw->Lun;
1249 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1250 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1251
1252 INIT_WORK(&cmd->work, bot_cmd_work);
1253 ret = queue_work(tpg->workqueue, &cmd->work);
1254 if (ret < 0)
1255 goto err;
1256
1257 return 0;
1258 err:
1259 kfree(cmd);
1260 return -EINVAL;
1261 }
1262
1263 /* Start fabric.c code */
1264
1265 static int usbg_check_true(struct se_portal_group *se_tpg)
1266 {
1267 return 1;
1268 }
1269
1270 static int usbg_check_false(struct se_portal_group *se_tpg)
1271 {
1272 return 0;
1273 }
1274
1275 static char *usbg_get_fabric_name(void)
1276 {
1277 return "usb_gadget";
1278 }
1279
1280 static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1281 {
1282 struct usbg_tpg *tpg = container_of(se_tpg,
1283 struct usbg_tpg, se_tpg);
1284 struct usbg_tport *tport = tpg->tport;
1285 u8 proto_id;
1286
1287 switch (tport->tport_proto_id) {
1288 case SCSI_PROTOCOL_SAS:
1289 default:
1290 proto_id = sas_get_fabric_proto_ident(se_tpg);
1291 break;
1292 }
1293
1294 return proto_id;
1295 }
1296
1297 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1298 {
1299 struct usbg_tpg *tpg = container_of(se_tpg,
1300 struct usbg_tpg, se_tpg);
1301 struct usbg_tport *tport = tpg->tport;
1302
1303 return &tport->tport_name[0];
1304 }
1305
1306 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1307 {
1308 struct usbg_tpg *tpg = container_of(se_tpg,
1309 struct usbg_tpg, se_tpg);
1310 return tpg->tport_tpgt;
1311 }
1312
1313 static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1314 {
1315 return 1;
1316 }
1317
1318 static u32 usbg_get_pr_transport_id(
1319 struct se_portal_group *se_tpg,
1320 struct se_node_acl *se_nacl,
1321 struct t10_pr_registration *pr_reg,
1322 int *format_code,
1323 unsigned char *buf)
1324 {
1325 struct usbg_tpg *tpg = container_of(se_tpg,
1326 struct usbg_tpg, se_tpg);
1327 struct usbg_tport *tport = tpg->tport;
1328 int ret = 0;
1329
1330 switch (tport->tport_proto_id) {
1331 case SCSI_PROTOCOL_SAS:
1332 default:
1333 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1334 format_code, buf);
1335 break;
1336 }
1337
1338 return ret;
1339 }
1340
1341 static u32 usbg_get_pr_transport_id_len(
1342 struct se_portal_group *se_tpg,
1343 struct se_node_acl *se_nacl,
1344 struct t10_pr_registration *pr_reg,
1345 int *format_code)
1346 {
1347 struct usbg_tpg *tpg = container_of(se_tpg,
1348 struct usbg_tpg, se_tpg);
1349 struct usbg_tport *tport = tpg->tport;
1350 int ret = 0;
1351
1352 switch (tport->tport_proto_id) {
1353 case SCSI_PROTOCOL_SAS:
1354 default:
1355 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1356 format_code);
1357 break;
1358 }
1359
1360 return ret;
1361 }
1362
1363 static char *usbg_parse_pr_out_transport_id(
1364 struct se_portal_group *se_tpg,
1365 const char *buf,
1366 u32 *out_tid_len,
1367 char **port_nexus_ptr)
1368 {
1369 struct usbg_tpg *tpg = container_of(se_tpg,
1370 struct usbg_tpg, se_tpg);
1371 struct usbg_tport *tport = tpg->tport;
1372 char *tid = NULL;
1373
1374 switch (tport->tport_proto_id) {
1375 case SCSI_PROTOCOL_SAS:
1376 default:
1377 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1378 port_nexus_ptr);
1379 }
1380
1381 return tid;
1382 }
1383
1384 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1385 {
1386 struct usbg_nacl *nacl;
1387
1388 nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1389 if (!nacl) {
1390 printk(KERN_ERR "Unable to alocate struct usbg_nacl\n");
1391 return NULL;
1392 }
1393
1394 return &nacl->se_node_acl;
1395 }
1396
1397 static void usbg_release_fabric_acl(
1398 struct se_portal_group *se_tpg,
1399 struct se_node_acl *se_nacl)
1400 {
1401 struct usbg_nacl *nacl = container_of(se_nacl,
1402 struct usbg_nacl, se_node_acl);
1403 kfree(nacl);
1404 }
1405
1406 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1407 {
1408 return 1;
1409 }
1410
1411 static void usbg_cmd_release(struct kref *ref)
1412 {
1413 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1414 ref);
1415
1416 transport_generic_free_cmd(&cmd->se_cmd, 0);
1417 }
1418
1419 static void usbg_release_cmd(struct se_cmd *se_cmd)
1420 {
1421 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1422 se_cmd);
1423 kfree(cmd->data_buf);
1424 kfree(cmd);
1425 return;
1426 }
1427
1428 static int usbg_shutdown_session(struct se_session *se_sess)
1429 {
1430 return 0;
1431 }
1432
1433 static void usbg_close_session(struct se_session *se_sess)
1434 {
1435 return;
1436 }
1437
1438 static u32 usbg_sess_get_index(struct se_session *se_sess)
1439 {
1440 return 0;
1441 }
1442
1443 /*
1444 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1445 */
1446 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1447 {
1448 return 0;
1449 }
1450
1451 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1452 {
1453 return;
1454 }
1455
1456 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1457 {
1458 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1459 se_cmd);
1460 struct f_uas *fu = cmd->fu;
1461
1462 if (fu->flags & USBG_IS_BOT)
1463 return le32_to_cpu(cmd->bot_tag);
1464 else
1465 return cmd->tag;
1466 }
1467
1468 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1469 {
1470 return 0;
1471 }
1472
1473 static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1474 {
1475 return 0;
1476 }
1477
1478 static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
1479 {
1480 return 0;
1481 }
1482
1483 static u16 usbg_get_fabric_sense_len(void)
1484 {
1485 return 0;
1486 }
1487
1488 static const char *usbg_check_wwn(const char *name)
1489 {
1490 const char *n;
1491 unsigned int len;
1492
1493 n = strstr(name, "naa.");
1494 if (!n)
1495 return NULL;
1496 n += 4;
1497 len = strlen(n);
1498 if (len == 0 || len > USBG_NAMELEN - 1)
1499 return NULL;
1500 return n;
1501 }
1502
1503 static struct se_node_acl *usbg_make_nodeacl(
1504 struct se_portal_group *se_tpg,
1505 struct config_group *group,
1506 const char *name)
1507 {
1508 struct se_node_acl *se_nacl, *se_nacl_new;
1509 struct usbg_nacl *nacl;
1510 u64 wwpn = 0;
1511 u32 nexus_depth;
1512 const char *wnn_name;
1513
1514 wnn_name = usbg_check_wwn(name);
1515 if (!wnn_name)
1516 return ERR_PTR(-EINVAL);
1517 se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1518 if (!(se_nacl_new))
1519 return ERR_PTR(-ENOMEM);
1520
1521 nexus_depth = 1;
1522 /*
1523 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1524 * when converting a NodeACL from demo mode -> explict
1525 */
1526 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1527 name, nexus_depth);
1528 if (IS_ERR(se_nacl)) {
1529 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1530 return se_nacl;
1531 }
1532 /*
1533 * Locate our struct usbg_nacl and set the FC Nport WWPN
1534 */
1535 nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1536 nacl->iport_wwpn = wwpn;
1537 snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1538 return se_nacl;
1539 }
1540
1541 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1542 {
1543 struct usbg_nacl *nacl = container_of(se_acl,
1544 struct usbg_nacl, se_node_acl);
1545 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1546 kfree(nacl);
1547 }
1548
1549 struct usbg_tpg *the_only_tpg_I_currently_have;
1550
1551 static struct se_portal_group *usbg_make_tpg(
1552 struct se_wwn *wwn,
1553 struct config_group *group,
1554 const char *name)
1555 {
1556 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1557 tport_wwn);
1558 struct usbg_tpg *tpg;
1559 unsigned long tpgt;
1560 int ret;
1561
1562 if (strstr(name, "tpgt_") != name)
1563 return ERR_PTR(-EINVAL);
1564 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1565 return ERR_PTR(-EINVAL);
1566 if (the_only_tpg_I_currently_have) {
1567 pr_err("Until the gadget framework can't handle multiple\n");
1568 pr_err("gadgets, you can't do this here.\n");
1569 return ERR_PTR(-EBUSY);
1570 }
1571
1572 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1573 if (!tpg) {
1574 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1575 return ERR_PTR(-ENOMEM);
1576 }
1577 mutex_init(&tpg->tpg_mutex);
1578 atomic_set(&tpg->tpg_port_count, 0);
1579 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1580 if (!tpg->workqueue) {
1581 kfree(tpg);
1582 return NULL;
1583 }
1584
1585 tpg->tport = tport;
1586 tpg->tport_tpgt = tpgt;
1587
1588 ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1589 &tpg->se_tpg, tpg,
1590 TRANSPORT_TPG_TYPE_NORMAL);
1591 if (ret < 0) {
1592 destroy_workqueue(tpg->workqueue);
1593 kfree(tpg);
1594 return NULL;
1595 }
1596 the_only_tpg_I_currently_have = tpg;
1597 return &tpg->se_tpg;
1598 }
1599
1600 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1601 {
1602 struct usbg_tpg *tpg = container_of(se_tpg,
1603 struct usbg_tpg, se_tpg);
1604
1605 core_tpg_deregister(se_tpg);
1606 destroy_workqueue(tpg->workqueue);
1607 kfree(tpg);
1608 the_only_tpg_I_currently_have = NULL;
1609 }
1610
1611 static struct se_wwn *usbg_make_tport(
1612 struct target_fabric_configfs *tf,
1613 struct config_group *group,
1614 const char *name)
1615 {
1616 struct usbg_tport *tport;
1617 const char *wnn_name;
1618 u64 wwpn = 0;
1619
1620 wnn_name = usbg_check_wwn(name);
1621 if (!wnn_name)
1622 return ERR_PTR(-EINVAL);
1623
1624 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1625 if (!(tport)) {
1626 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1627 return ERR_PTR(-ENOMEM);
1628 }
1629 tport->tport_wwpn = wwpn;
1630 snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
1631 return &tport->tport_wwn;
1632 }
1633
1634 static void usbg_drop_tport(struct se_wwn *wwn)
1635 {
1636 struct usbg_tport *tport = container_of(wwn,
1637 struct usbg_tport, tport_wwn);
1638 kfree(tport);
1639 }
1640
1641 /*
1642 * If somebody feels like dropping the version property, go ahead.
1643 */
1644 static ssize_t usbg_wwn_show_attr_version(
1645 struct target_fabric_configfs *tf,
1646 char *page)
1647 {
1648 return sprintf(page, "usb-gadget fabric module\n");
1649 }
1650 TF_WWN_ATTR_RO(usbg, version);
1651
1652 static struct configfs_attribute *usbg_wwn_attrs[] = {
1653 &usbg_wwn_version.attr,
1654 NULL,
1655 };
1656
1657 static ssize_t tcm_usbg_tpg_show_enable(
1658 struct se_portal_group *se_tpg,
1659 char *page)
1660 {
1661 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1662
1663 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1664 }
1665
1666 static int usbg_attach(struct usbg_tpg *);
1667 static void usbg_detach(struct usbg_tpg *);
1668
1669 static ssize_t tcm_usbg_tpg_store_enable(
1670 struct se_portal_group *se_tpg,
1671 const char *page,
1672 size_t count)
1673 {
1674 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1675 unsigned long op;
1676 ssize_t ret;
1677
1678 ret = kstrtoul(page, 0, &op);
1679 if (ret < 0)
1680 return -EINVAL;
1681 if (op > 1)
1682 return -EINVAL;
1683
1684 if (op && tpg->gadget_connect)
1685 goto out;
1686 if (!op && !tpg->gadget_connect)
1687 goto out;
1688
1689 if (op) {
1690 ret = usbg_attach(tpg);
1691 if (ret)
1692 goto out;
1693 } else {
1694 usbg_detach(tpg);
1695 }
1696 tpg->gadget_connect = op;
1697 out:
1698 return count;
1699 }
1700 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1701
1702 static ssize_t tcm_usbg_tpg_show_nexus(
1703 struct se_portal_group *se_tpg,
1704 char *page)
1705 {
1706 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1707 struct tcm_usbg_nexus *tv_nexus;
1708 ssize_t ret;
1709
1710 mutex_lock(&tpg->tpg_mutex);
1711 tv_nexus = tpg->tpg_nexus;
1712 if (!tv_nexus) {
1713 ret = -ENODEV;
1714 goto out;
1715 }
1716 ret = snprintf(page, PAGE_SIZE, "%s\n",
1717 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1718 out:
1719 mutex_unlock(&tpg->tpg_mutex);
1720 return ret;
1721 }
1722
1723 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1724 {
1725 struct se_portal_group *se_tpg;
1726 struct tcm_usbg_nexus *tv_nexus;
1727 int ret;
1728
1729 mutex_lock(&tpg->tpg_mutex);
1730 if (tpg->tpg_nexus) {
1731 ret = -EEXIST;
1732 pr_debug("tpg->tpg_nexus already exists\n");
1733 goto err_unlock;
1734 }
1735 se_tpg = &tpg->se_tpg;
1736
1737 ret = -ENOMEM;
1738 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1739 if (!tv_nexus) {
1740 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1741 goto err_unlock;
1742 }
1743 tv_nexus->tvn_se_sess = transport_init_session();
1744 if (IS_ERR(tv_nexus->tvn_se_sess))
1745 goto err_free;
1746
1747 /*
1748 * Since we are running in 'demo mode' this call with generate a
1749 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1750 * the SCSI Initiator port name of the passed configfs group 'name'.
1751 */
1752 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1753 se_tpg, name);
1754 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1755 pr_debug("core_tpg_check_initiator_node_acl() failed"
1756 " for %s\n", name);
1757 goto err_session;
1758 }
1759 /*
1760 * Now register the TCM vHost virtual I_T Nexus as active with the
1761 * call to __transport_register_session()
1762 */
1763 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1764 tv_nexus->tvn_se_sess, tv_nexus);
1765 tpg->tpg_nexus = tv_nexus;
1766 mutex_unlock(&tpg->tpg_mutex);
1767 return 0;
1768
1769 err_session:
1770 transport_free_session(tv_nexus->tvn_se_sess);
1771 err_free:
1772 kfree(tv_nexus);
1773 err_unlock:
1774 mutex_unlock(&tpg->tpg_mutex);
1775 return ret;
1776 }
1777
1778 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1779 {
1780 struct se_session *se_sess;
1781 struct tcm_usbg_nexus *tv_nexus;
1782 int ret = -ENODEV;
1783
1784 mutex_lock(&tpg->tpg_mutex);
1785 tv_nexus = tpg->tpg_nexus;
1786 if (!tv_nexus)
1787 goto out;
1788
1789 se_sess = tv_nexus->tvn_se_sess;
1790 if (!se_sess)
1791 goto out;
1792
1793 if (atomic_read(&tpg->tpg_port_count)) {
1794 ret = -EPERM;
1795 pr_err("Unable to remove Host I_T Nexus with"
1796 " active TPG port count: %d\n",
1797 atomic_read(&tpg->tpg_port_count));
1798 goto out;
1799 }
1800
1801 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1802 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1803 /*
1804 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1805 */
1806 transport_deregister_session(tv_nexus->tvn_se_sess);
1807 tpg->tpg_nexus = NULL;
1808
1809 kfree(tv_nexus);
1810 out:
1811 mutex_unlock(&tpg->tpg_mutex);
1812 return 0;
1813 }
1814
1815 static ssize_t tcm_usbg_tpg_store_nexus(
1816 struct se_portal_group *se_tpg,
1817 const char *page,
1818 size_t count)
1819 {
1820 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1821 unsigned char i_port[USBG_NAMELEN], *ptr;
1822 int ret;
1823
1824 if (!strncmp(page, "NULL", 4)) {
1825 ret = tcm_usbg_drop_nexus(tpg);
1826 return (!ret) ? count : ret;
1827 }
1828 if (strlen(page) > USBG_NAMELEN) {
1829 pr_err("Emulated NAA Sas Address: %s, exceeds"
1830 " max: %d\n", page, USBG_NAMELEN);
1831 return -EINVAL;
1832 }
1833 snprintf(i_port, USBG_NAMELEN, "%s", page);
1834
1835 ptr = strstr(i_port, "naa.");
1836 if (!ptr) {
1837 pr_err("Missing 'naa.' prefix\n");
1838 return -EINVAL;
1839 }
1840
1841 if (i_port[strlen(i_port) - 1] == '\n')
1842 i_port[strlen(i_port) - 1] = '\0';
1843
1844 ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1845 if (ret < 0)
1846 return ret;
1847 return count;
1848 }
1849 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1850
1851 static struct configfs_attribute *usbg_base_attrs[] = {
1852 &tcm_usbg_tpg_enable.attr,
1853 &tcm_usbg_tpg_nexus.attr,
1854 NULL,
1855 };
1856
1857 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1858 {
1859 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1860
1861 atomic_inc(&tpg->tpg_port_count);
1862 smp_mb__after_atomic_inc();
1863 return 0;
1864 }
1865
1866 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1867 struct se_lun *se_lun)
1868 {
1869 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1870
1871 atomic_dec(&tpg->tpg_port_count);
1872 smp_mb__after_atomic_dec();
1873 }
1874
1875 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1876 {
1877 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1878 se_cmd);
1879
1880 kref_put(&cmd->ref, usbg_cmd_release);
1881 return 1;
1882 }
1883
1884 static struct target_core_fabric_ops usbg_ops = {
1885 .get_fabric_name = usbg_get_fabric_name,
1886 .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
1887 .tpg_get_wwn = usbg_get_fabric_wwn,
1888 .tpg_get_tag = usbg_get_tag,
1889 .tpg_get_default_depth = usbg_get_default_depth,
1890 .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
1891 .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
1892 .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
1893 .tpg_check_demo_mode = usbg_check_true,
1894 .tpg_check_demo_mode_cache = usbg_check_false,
1895 .tpg_check_demo_mode_write_protect = usbg_check_false,
1896 .tpg_check_prod_mode_write_protect = usbg_check_false,
1897 .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
1898 .tpg_release_fabric_acl = usbg_release_fabric_acl,
1899 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1900 .release_cmd = usbg_release_cmd,
1901 .shutdown_session = usbg_shutdown_session,
1902 .close_session = usbg_close_session,
1903 .sess_get_index = usbg_sess_get_index,
1904 .sess_get_initiator_sid = NULL,
1905 .write_pending = usbg_send_write_request,
1906 .write_pending_status = usbg_write_pending_status,
1907 .set_default_node_attributes = usbg_set_default_node_attrs,
1908 .get_task_tag = usbg_get_task_tag,
1909 .get_cmd_state = usbg_get_cmd_state,
1910 .queue_data_in = usbg_send_read_response,
1911 .queue_status = usbg_send_status_response,
1912 .queue_tm_rsp = usbg_queue_tm_rsp,
1913 .get_fabric_sense_len = usbg_get_fabric_sense_len,
1914 .set_fabric_sense_len = usbg_set_fabric_sense_len,
1915 .check_stop_free = usbg_check_stop_free,
1916
1917 .fabric_make_wwn = usbg_make_tport,
1918 .fabric_drop_wwn = usbg_drop_tport,
1919 .fabric_make_tpg = usbg_make_tpg,
1920 .fabric_drop_tpg = usbg_drop_tpg,
1921 .fabric_post_link = usbg_port_link,
1922 .fabric_pre_unlink = usbg_port_unlink,
1923 .fabric_make_np = NULL,
1924 .fabric_drop_np = NULL,
1925 .fabric_make_nodeacl = usbg_make_nodeacl,
1926 .fabric_drop_nodeacl = usbg_drop_nodeacl,
1927 };
1928
1929 static int usbg_register_configfs(void)
1930 {
1931 struct target_fabric_configfs *fabric;
1932 int ret;
1933
1934 fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1935 if (IS_ERR(fabric)) {
1936 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1937 return PTR_ERR(fabric);
1938 }
1939
1940 fabric->tf_ops = usbg_ops;
1941 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1942 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1943 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1944 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1945 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1946 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1947 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1948 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1949 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1950 ret = target_fabric_configfs_register(fabric);
1951 if (ret < 0) {
1952 printk(KERN_ERR "target_fabric_configfs_register() failed"
1953 " for usb-gadget\n");
1954 return ret;
1955 }
1956 usbg_fabric_configfs = fabric;
1957 return 0;
1958 };
1959
1960 static void usbg_deregister_configfs(void)
1961 {
1962 if (!(usbg_fabric_configfs))
1963 return;
1964
1965 target_fabric_configfs_deregister(usbg_fabric_configfs);
1966 usbg_fabric_configfs = NULL;
1967 };
1968
1969 /* Start gadget.c code */
1970
1971 static struct usb_interface_descriptor bot_intf_desc = {
1972 .bLength = sizeof(bot_intf_desc),
1973 .bDescriptorType = USB_DT_INTERFACE,
1974 .bAlternateSetting = 0,
1975 .bNumEndpoints = 2,
1976 .bAlternateSetting = USB_G_ALT_INT_BBB,
1977 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1978 .bInterfaceSubClass = USB_SC_SCSI,
1979 .bInterfaceProtocol = USB_PR_BULK,
1980 .iInterface = USB_G_STR_INT_UAS,
1981 };
1982
1983 static struct usb_interface_descriptor uasp_intf_desc = {
1984 .bLength = sizeof(uasp_intf_desc),
1985 .bDescriptorType = USB_DT_INTERFACE,
1986 .bNumEndpoints = 4,
1987 .bAlternateSetting = USB_G_ALT_INT_UAS,
1988 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1989 .bInterfaceSubClass = USB_SC_SCSI,
1990 .bInterfaceProtocol = USB_PR_UAS,
1991 .iInterface = USB_G_STR_INT_BBB,
1992 };
1993
1994 static struct usb_endpoint_descriptor uasp_bi_desc = {
1995 .bLength = USB_DT_ENDPOINT_SIZE,
1996 .bDescriptorType = USB_DT_ENDPOINT,
1997 .bEndpointAddress = USB_DIR_IN,
1998 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1999 .wMaxPacketSize = cpu_to_le16(512),
2000 };
2001
2002 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
2003 .bLength = USB_DT_ENDPOINT_SIZE,
2004 .bDescriptorType = USB_DT_ENDPOINT,
2005 .bEndpointAddress = USB_DIR_IN,
2006 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2007 };
2008
2009 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
2010 .bLength = sizeof(uasp_bi_pipe_desc),
2011 .bDescriptorType = USB_DT_PIPE_USAGE,
2012 .bPipeID = DATA_IN_PIPE_ID,
2013 };
2014
2015 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
2016 .bLength = USB_DT_ENDPOINT_SIZE,
2017 .bDescriptorType = USB_DT_ENDPOINT,
2018 .bEndpointAddress = USB_DIR_IN,
2019 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2020 .wMaxPacketSize = cpu_to_le16(1024),
2021 };
2022
2023 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2024 .bLength = sizeof(uasp_bi_ep_comp_desc),
2025 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2026 .bMaxBurst = 0,
2027 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2028 .wBytesPerInterval = 0,
2029 };
2030
2031 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2032 .bLength = sizeof(bot_bi_ep_comp_desc),
2033 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2034 .bMaxBurst = 0,
2035 };
2036
2037 static struct usb_endpoint_descriptor uasp_bo_desc = {
2038 .bLength = USB_DT_ENDPOINT_SIZE,
2039 .bDescriptorType = USB_DT_ENDPOINT,
2040 .bEndpointAddress = USB_DIR_OUT,
2041 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2042 .wMaxPacketSize = cpu_to_le16(512),
2043 };
2044
2045 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2046 .bLength = USB_DT_ENDPOINT_SIZE,
2047 .bDescriptorType = USB_DT_ENDPOINT,
2048 .bEndpointAddress = USB_DIR_OUT,
2049 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2050 };
2051
2052 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2053 .bLength = sizeof(uasp_bo_pipe_desc),
2054 .bDescriptorType = USB_DT_PIPE_USAGE,
2055 .bPipeID = DATA_OUT_PIPE_ID,
2056 };
2057
2058 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2059 .bLength = USB_DT_ENDPOINT_SIZE,
2060 .bDescriptorType = USB_DT_ENDPOINT,
2061 .bEndpointAddress = USB_DIR_OUT,
2062 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2063 .wMaxPacketSize = cpu_to_le16(0x400),
2064 };
2065
2066 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2067 .bLength = sizeof(uasp_bo_ep_comp_desc),
2068 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2069 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2070 };
2071
2072 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2073 .bLength = sizeof(bot_bo_ep_comp_desc),
2074 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2075 };
2076
2077 static struct usb_endpoint_descriptor uasp_status_desc = {
2078 .bLength = USB_DT_ENDPOINT_SIZE,
2079 .bDescriptorType = USB_DT_ENDPOINT,
2080 .bEndpointAddress = USB_DIR_IN,
2081 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2082 .wMaxPacketSize = cpu_to_le16(512),
2083 };
2084
2085 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2086 .bLength = USB_DT_ENDPOINT_SIZE,
2087 .bDescriptorType = USB_DT_ENDPOINT,
2088 .bEndpointAddress = USB_DIR_IN,
2089 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2090 };
2091
2092 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2093 .bLength = sizeof(uasp_status_pipe_desc),
2094 .bDescriptorType = USB_DT_PIPE_USAGE,
2095 .bPipeID = STATUS_PIPE_ID,
2096 };
2097
2098 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2099 .bLength = USB_DT_ENDPOINT_SIZE,
2100 .bDescriptorType = USB_DT_ENDPOINT,
2101 .bEndpointAddress = USB_DIR_IN,
2102 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2103 .wMaxPacketSize = cpu_to_le16(1024),
2104 };
2105
2106 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2107 .bLength = sizeof(uasp_status_in_ep_comp_desc),
2108 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2109 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2110 };
2111
2112 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2113 .bLength = USB_DT_ENDPOINT_SIZE,
2114 .bDescriptorType = USB_DT_ENDPOINT,
2115 .bEndpointAddress = USB_DIR_OUT,
2116 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2117 .wMaxPacketSize = cpu_to_le16(512),
2118 };
2119
2120 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2121 .bLength = USB_DT_ENDPOINT_SIZE,
2122 .bDescriptorType = USB_DT_ENDPOINT,
2123 .bEndpointAddress = USB_DIR_OUT,
2124 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2125 };
2126
2127 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2128 .bLength = sizeof(uasp_cmd_pipe_desc),
2129 .bDescriptorType = USB_DT_PIPE_USAGE,
2130 .bPipeID = CMD_PIPE_ID,
2131 };
2132
2133 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2134 .bLength = USB_DT_ENDPOINT_SIZE,
2135 .bDescriptorType = USB_DT_ENDPOINT,
2136 .bEndpointAddress = USB_DIR_OUT,
2137 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2138 .wMaxPacketSize = cpu_to_le16(1024),
2139 };
2140
2141 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2142 .bLength = sizeof(uasp_cmd_comp_desc),
2143 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2144 };
2145
2146 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2147 (struct usb_descriptor_header *) &bot_intf_desc,
2148 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2149 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2150
2151 (struct usb_descriptor_header *) &uasp_intf_desc,
2152 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2153 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2154 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2155 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2156 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2157 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2158 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2159 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2160 };
2161
2162 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2163 (struct usb_descriptor_header *) &bot_intf_desc,
2164 (struct usb_descriptor_header *) &uasp_bi_desc,
2165 (struct usb_descriptor_header *) &uasp_bo_desc,
2166
2167 (struct usb_descriptor_header *) &uasp_intf_desc,
2168 (struct usb_descriptor_header *) &uasp_bi_desc,
2169 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2170 (struct usb_descriptor_header *) &uasp_bo_desc,
2171 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2172 (struct usb_descriptor_header *) &uasp_status_desc,
2173 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2174 (struct usb_descriptor_header *) &uasp_cmd_desc,
2175 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2176 NULL,
2177 };
2178
2179 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2180 (struct usb_descriptor_header *) &bot_intf_desc,
2181 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2182 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2183 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2184 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2185
2186 (struct usb_descriptor_header *) &uasp_intf_desc,
2187 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2188 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2189 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2190 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2191 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2192 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2193 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2194 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2195 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2196 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2197 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2198 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2199 NULL,
2200 };
2201
2202 #define UAS_VENDOR_ID 0x0525 /* NetChip */
2203 #define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
2204
2205 static struct usb_device_descriptor usbg_device_desc = {
2206 .bLength = sizeof(usbg_device_desc),
2207 .bDescriptorType = USB_DT_DEVICE,
2208 .bcdUSB = cpu_to_le16(0x0200),
2209 .bDeviceClass = USB_CLASS_PER_INTERFACE,
2210 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
2211 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
2212 .iManufacturer = USB_G_STR_MANUFACTOR,
2213 .iProduct = USB_G_STR_PRODUCT,
2214 .iSerialNumber = USB_G_STR_SERIAL,
2215
2216 .bNumConfigurations = 1,
2217 };
2218
2219 static struct usb_string usbg_us_strings[] = {
2220 { USB_G_STR_MANUFACTOR, "Target Manufactor"},
2221 { USB_G_STR_PRODUCT, "Target Product"},
2222 { USB_G_STR_SERIAL, "000000000001"},
2223 { USB_G_STR_CONFIG, "default config"},
2224 { USB_G_STR_INT_UAS, "USB Attached SCSI"},
2225 { USB_G_STR_INT_BBB, "Bulk Only Transport"},
2226 { },
2227 };
2228
2229 static struct usb_gadget_strings usbg_stringtab = {
2230 .language = 0x0409,
2231 .strings = usbg_us_strings,
2232 };
2233
2234 static struct usb_gadget_strings *usbg_strings[] = {
2235 &usbg_stringtab,
2236 NULL,
2237 };
2238
2239 static int guas_unbind(struct usb_composite_dev *cdev)
2240 {
2241 return 0;
2242 }
2243
2244 static struct usb_configuration usbg_config_driver = {
2245 .label = "Linux Target",
2246 .bConfigurationValue = 1,
2247 .iConfiguration = USB_G_STR_CONFIG,
2248 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2249 };
2250
2251 static void give_back_ep(struct usb_ep **pep)
2252 {
2253 struct usb_ep *ep = *pep;
2254 if (!ep)
2255 return;
2256 ep->driver_data = NULL;
2257 }
2258
2259 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2260 {
2261 struct f_uas *fu = to_f_uas(f);
2262 struct usb_gadget *gadget = c->cdev->gadget;
2263 struct usb_ep *ep;
2264 int iface;
2265
2266 iface = usb_interface_id(c, f);
2267 if (iface < 0)
2268 return iface;
2269
2270 bot_intf_desc.bInterfaceNumber = iface;
2271 uasp_intf_desc.bInterfaceNumber = iface;
2272 fu->iface = iface;
2273 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2274 &uasp_bi_ep_comp_desc);
2275 if (!ep)
2276 goto ep_fail;
2277
2278 ep->driver_data = fu;
2279 fu->ep_in = ep;
2280
2281 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2282 &uasp_bo_ep_comp_desc);
2283 if (!ep)
2284 goto ep_fail;
2285 ep->driver_data = fu;
2286 fu->ep_out = ep;
2287
2288 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2289 &uasp_status_in_ep_comp_desc);
2290 if (!ep)
2291 goto ep_fail;
2292 ep->driver_data = fu;
2293 fu->ep_status = ep;
2294
2295 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2296 &uasp_cmd_comp_desc);
2297 if (!ep)
2298 goto ep_fail;
2299 ep->driver_data = fu;
2300 fu->ep_cmd = ep;
2301
2302 /* Assume endpoint addresses are the same for both speeds */
2303 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2304 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2305 uasp_status_desc.bEndpointAddress =
2306 uasp_ss_status_desc.bEndpointAddress;
2307 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2308
2309 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2310 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2311 uasp_fs_status_desc.bEndpointAddress =
2312 uasp_ss_status_desc.bEndpointAddress;
2313 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2314
2315 return 0;
2316 ep_fail:
2317 pr_err("Can't claim all required eps\n");
2318
2319 give_back_ep(&fu->ep_in);
2320 give_back_ep(&fu->ep_out);
2321 give_back_ep(&fu->ep_status);
2322 give_back_ep(&fu->ep_cmd);
2323 return -ENOTSUPP;
2324 }
2325
2326 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2327 {
2328 struct f_uas *fu = to_f_uas(f);
2329
2330 kfree(fu);
2331 }
2332
2333 struct guas_setup_wq {
2334 struct work_struct work;
2335 struct f_uas *fu;
2336 unsigned int alt;
2337 };
2338
2339 static void usbg_delayed_set_alt(struct work_struct *wq)
2340 {
2341 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2342 work);
2343 struct f_uas *fu = work->fu;
2344 int alt = work->alt;
2345
2346 kfree(work);
2347
2348 if (fu->flags & USBG_IS_BOT)
2349 bot_cleanup_old_alt(fu);
2350 if (fu->flags & USBG_IS_UAS)
2351 uasp_cleanup_old_alt(fu);
2352
2353 if (alt == USB_G_ALT_INT_BBB)
2354 bot_set_alt(fu);
2355 else if (alt == USB_G_ALT_INT_UAS)
2356 uasp_set_alt(fu);
2357 usb_composite_setup_continue(fu->function.config->cdev);
2358 }
2359
2360 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2361 {
2362 struct f_uas *fu = to_f_uas(f);
2363
2364 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2365 struct guas_setup_wq *work;
2366
2367 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2368 if (!work)
2369 return -ENOMEM;
2370 INIT_WORK(&work->work, usbg_delayed_set_alt);
2371 work->fu = fu;
2372 work->alt = alt;
2373 schedule_work(&work->work);
2374 return USB_GADGET_DELAYED_STATUS;
2375 }
2376 return -EOPNOTSUPP;
2377 }
2378
2379 static void usbg_disable(struct usb_function *f)
2380 {
2381 struct f_uas *fu = to_f_uas(f);
2382
2383 if (fu->flags & USBG_IS_UAS)
2384 uasp_cleanup_old_alt(fu);
2385 else if (fu->flags & USBG_IS_BOT)
2386 bot_cleanup_old_alt(fu);
2387 fu->flags = 0;
2388 }
2389
2390 static int usbg_setup(struct usb_function *f,
2391 const struct usb_ctrlrequest *ctrl)
2392 {
2393 struct f_uas *fu = to_f_uas(f);
2394
2395 if (!(fu->flags & USBG_IS_BOT))
2396 return -EOPNOTSUPP;
2397
2398 return usbg_bot_setup(f, ctrl);
2399 }
2400
2401 static int usbg_cfg_bind(struct usb_configuration *c)
2402 {
2403 struct f_uas *fu;
2404 int ret;
2405
2406 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2407 if (!fu)
2408 return -ENOMEM;
2409 fu->function.name = "Target Function";
2410 fu->function.descriptors = uasp_fs_function_desc;
2411 fu->function.hs_descriptors = uasp_hs_function_desc;
2412 fu->function.ss_descriptors = uasp_ss_function_desc;
2413 fu->function.bind = usbg_bind;
2414 fu->function.unbind = usbg_unbind;
2415 fu->function.set_alt = usbg_set_alt;
2416 fu->function.setup = usbg_setup;
2417 fu->function.disable = usbg_disable;
2418 fu->tpg = the_only_tpg_I_currently_have;
2419
2420 ret = usb_add_function(c, &fu->function);
2421 if (ret)
2422 goto err;
2423
2424 return 0;
2425 err:
2426 kfree(fu);
2427 return ret;
2428 }
2429
2430 static int usb_target_bind(struct usb_composite_dev *cdev)
2431 {
2432 int ret;
2433
2434 ret = usb_add_config(cdev, &usbg_config_driver,
2435 usbg_cfg_bind);
2436 return 0;
2437 }
2438
2439 static struct usb_composite_driver usbg_driver = {
2440 .name = "g_target",
2441 .dev = &usbg_device_desc,
2442 .strings = usbg_strings,
2443 .max_speed = USB_SPEED_SUPER,
2444 .unbind = guas_unbind,
2445 };
2446
2447 static int usbg_attach(struct usbg_tpg *tpg)
2448 {
2449 return usb_composite_probe(&usbg_driver, usb_target_bind);
2450 }
2451
2452 static void usbg_detach(struct usbg_tpg *tpg)
2453 {
2454 usb_composite_unregister(&usbg_driver);
2455 }
2456
2457 static int __init usb_target_gadget_init(void)
2458 {
2459 int ret;
2460
2461 ret = usbg_register_configfs();
2462 return ret;
2463 }
2464 module_init(usb_target_gadget_init);
2465
2466 static void __exit usb_target_gadget_exit(void)
2467 {
2468 usbg_deregister_configfs();
2469 }
2470 module_exit(usb_target_gadget_exit);
2471
2472 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2473 MODULE_DESCRIPTION("usb-gadget fabric");
2474 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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