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target/usb-gadget: remove duplicate initialization
[deliverable/linux.git] / drivers / usb / gadget / tcm_usb_gadget.c
CommitLineData
c52661d6
SAS		 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
35static struct target_fabric_configfs *usbg_fabric_configfs;
36
37static inline struct f_uas *to_f_uas(struct usb_function *f)
38{
39 return container_of(f, struct f_uas, function);
40}
41
42static void usbg_cmd_release(struct kref *);
43
44static 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
51static 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
64static 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
79static 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
103static 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
126static 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
160static 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 */
196static 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 */
206static 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
216static 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
255static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
256static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
257
258static 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);
70baf0ab 297 target_execute_cmd(se_cmd);
c52661d6
SAS		 298cleanup:
299 return ret;
300}
301
302static int bot_submit_command(struct f_uas *, void *, unsigned int);
303
304static 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
319static 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;
357err_queue:
358 kfree(fu->cmd.buf);
359 fu->cmd.buf = NULL;
360err_buf:
361 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
362err_sts:
363 usb_ep_free_request(fu->ep_out, fu->cmd.req);
364 fu->cmd.req = NULL;
365err_cmd:
366 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
367 fu->bot_req_out = NULL;
368err_out:
369 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
370 fu->bot_req_in = NULL;
371err:
372 pr_err("BOT: endpoint setup failed\n");
373 return -ENOMEM;
374}
375
376void 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
401static 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;
425err_wq:
426 usb_ep_disable(fu->ep_out);
427err_b_out:
428 usb_ep_disable(fu->ep_in);
429err_b_in:
430 fu->flags = USBG_IS_BOT;
431}
432
433static 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
484static 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
499static 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
507static 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
524static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
525
526static 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
558static 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
579static 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
626cleanup:
627 usbg_cleanup_cmd(cmd);
628}
629
630static 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
644static 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 }
683out:
684 return ret;
685}
686
687static 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);
70baf0ab 728 target_execute_cmd(se_cmd);
c52661d6
SAS		 729cleanup:
730 return ret;
731}
732
733static int usbg_submit_command(struct f_uas *, void *, unsigned int);
734
735static 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
755static 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;
770err_sts:
771 usb_ep_free_request(fu->ep_status, stream->req_status);
772 stream->req_status = NULL;
773err_out:
774 usb_ep_free_request(fu->ep_out, stream->req_out);
775 stream->req_out = NULL;
776out:
777 return -ENOMEM;
778}
779
780static 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
796err_buf:
797 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
798err:
799 return -ENOMEM;
800}
801
802static 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
815static 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
843err_free_stream:
844 uasp_free_cmdreq(fu);
845
846err_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
857static 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;
894err_wq:
895 usb_ep_disable(fu->ep_status);
896err_status:
897 usb_ep_disable(fu->ep_cmd);
898err_cmd:
899 usb_ep_disable(fu->ep_out);
900err_b_out:
901 usb_ep_disable(fu->ep_in);
902err_b_in:
903 fu->flags = 0;
904}
905
906static 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
967static 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
987cleanup:
988 usbg_cleanup_cmd(cmd);
989}
990
991static 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
1015static 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
1027static 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
1039static 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
1051static 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);
d6dfc868 1068 goto out;
c52661d6
SAS		 1069 }
1070
d6dfc868 1071 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
c52661d6 1072 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
d6dfc868
RD		 1073 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1074 goto out;
1075
1076 return;
1077
1078out:
1079 transport_send_check_condition_and_sense(se_cmd,
1080 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1081 usbg_cleanup_cmd(cmd);
c52661d6
SAS		 1082}
1083
1084static 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;
1162err:
1163 kfree(cmd);
1164 return -EINVAL;
1165}
1166
1167static 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);
d6dfc868 1184 goto out;
c52661d6
SAS		 1185 }
1186
d6dfc868 1187 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
c52661d6 1188 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
d6dfc868
RD		 1189 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1190 goto out;
1191
1192 return;
1193
1194out:
1195 transport_send_check_condition_and_sense(se_cmd,
1196 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1197 usbg_cleanup_cmd(cmd);
c52661d6
SAS		 1198}
1199
1200static 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;
1258err:
1259 kfree(cmd);
1260 return -EINVAL;
1261}
1262
1263/* Start fabric.c code */
1264
1265static int usbg_check_true(struct se_portal_group *se_tpg)
1266{
1267 return 1;
1268}
1269
1270static int usbg_check_false(struct se_portal_group *se_tpg)
1271{
1272 return 0;
1273}
1274
1275static char *usbg_get_fabric_name(void)
1276{
1277 return "usb_gadget";
1278}
1279
1280static 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
1297static 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
1306static 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
1313static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1314{
1315 return 1;
1316}
1317
1318static 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
1341static 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
1363static 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
1384static 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
1397static 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
1406static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1407{
1408 return 1;
1409}
1410
c52661d6
SAS		 1411static 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
1419static 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
1428static int usbg_shutdown_session(struct se_session *se_sess)
1429{
1430 return 0;
1431}
1432
1433static void usbg_close_session(struct se_session *se_sess)
1434{
1435 return;
1436}
1437
1438static 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 */
1446static int usbg_write_pending_status(struct se_cmd *se_cmd)
1447{
1448 return 0;
1449}
1450
1451static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1452{
1453 return;
1454}
1455
1456static 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
1468static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1469{
1470 return 0;
1471}
1472
1473static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1474{
1475 return 0;
1476}
1477
c52661d6
SAS		 1478static const char *usbg_check_wwn(const char *name)
1479{
1480 const char *n;
1481 unsigned int len;
1482
1483 n = strstr(name, "naa.");
1484 if (!n)
1485 return NULL;
1486 n += 4;
1487 len = strlen(n);
1488 if (len == 0 || len > USBG_NAMELEN - 1)
1489 return NULL;
1490 return n;
1491}
1492
1493static struct se_node_acl *usbg_make_nodeacl(
1494 struct se_portal_group *se_tpg,
1495 struct config_group *group,
1496 const char *name)
1497{
1498 struct se_node_acl *se_nacl, *se_nacl_new;
1499 struct usbg_nacl *nacl;
1500 u64 wwpn = 0;
1501 u32 nexus_depth;
1502 const char *wnn_name;
1503
1504 wnn_name = usbg_check_wwn(name);
1505 if (!wnn_name)
1506 return ERR_PTR(-EINVAL);
1507 se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1508 if (!(se_nacl_new))
1509 return ERR_PTR(-ENOMEM);
1510
1511 nexus_depth = 1;
1512 /*
1513 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1514 * when converting a NodeACL from demo mode -> explict
1515 */
1516 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1517 name, nexus_depth);
1518 if (IS_ERR(se_nacl)) {
1519 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1520 return se_nacl;
1521 }
1522 /*
1523 * Locate our struct usbg_nacl and set the FC Nport WWPN
1524 */
1525 nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1526 nacl->iport_wwpn = wwpn;
1527 snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1528 return se_nacl;
1529}
1530
1531static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1532{
1533 struct usbg_nacl *nacl = container_of(se_acl,
1534 struct usbg_nacl, se_node_acl);
1535 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1536 kfree(nacl);
1537}
1538
1539struct usbg_tpg *the_only_tpg_I_currently_have;
1540
1541static struct se_portal_group *usbg_make_tpg(
1542 struct se_wwn *wwn,
1543 struct config_group *group,
1544 const char *name)
1545{
1546 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1547 tport_wwn);
1548 struct usbg_tpg *tpg;
1549 unsigned long tpgt;
1550 int ret;
1551
1552 if (strstr(name, "tpgt_") != name)
1553 return ERR_PTR(-EINVAL);
1554 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1555 return ERR_PTR(-EINVAL);
1556 if (the_only_tpg_I_currently_have) {
1557 pr_err("Until the gadget framework can't handle multiple\n");
1558 pr_err("gadgets, you can't do this here.\n");
1559 return ERR_PTR(-EBUSY);
1560 }
1561
1562 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1563 if (!tpg) {
1564 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1565 return ERR_PTR(-ENOMEM);
1566 }
1567 mutex_init(&tpg->tpg_mutex);
1568 atomic_set(&tpg->tpg_port_count, 0);
1569 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1570 if (!tpg->workqueue) {
1571 kfree(tpg);
1572 return NULL;
1573 }
1574
1575 tpg->tport = tport;
1576 tpg->tport_tpgt = tpgt;
1577
1578 ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1579 &tpg->se_tpg, tpg,
1580 TRANSPORT_TPG_TYPE_NORMAL);
1581 if (ret < 0) {
1582 destroy_workqueue(tpg->workqueue);
1583 kfree(tpg);
1584 return NULL;
1585 }
1586 the_only_tpg_I_currently_have = tpg;
1587 return &tpg->se_tpg;
1588}
1589
1590static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1591{
1592 struct usbg_tpg *tpg = container_of(se_tpg,
1593 struct usbg_tpg, se_tpg);
1594
1595 core_tpg_deregister(se_tpg);
1596 destroy_workqueue(tpg->workqueue);
1597 kfree(tpg);
1598 the_only_tpg_I_currently_have = NULL;
1599}
1600
1601static struct se_wwn *usbg_make_tport(
1602 struct target_fabric_configfs *tf,
1603 struct config_group *group,
1604 const char *name)
1605{
1606 struct usbg_tport *tport;
1607 const char *wnn_name;
1608 u64 wwpn = 0;
1609
1610 wnn_name = usbg_check_wwn(name);
1611 if (!wnn_name)
1612 return ERR_PTR(-EINVAL);
1613
1614 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1615 if (!(tport)) {
1616 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1617 return ERR_PTR(-ENOMEM);
1618 }
1619 tport->tport_wwpn = wwpn;
1620 snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
1621 return &tport->tport_wwn;
1622}
1623
1624static void usbg_drop_tport(struct se_wwn *wwn)
1625{
1626 struct usbg_tport *tport = container_of(wwn,
1627 struct usbg_tport, tport_wwn);
1628 kfree(tport);
1629}
1630
1631/*
1632 * If somebody feels like dropping the version property, go ahead.
1633 */
1634static ssize_t usbg_wwn_show_attr_version(
1635 struct target_fabric_configfs *tf,
1636 char *page)
1637{
1638 return sprintf(page, "usb-gadget fabric module\n");
1639}
1640TF_WWN_ATTR_RO(usbg, version);
1641
1642static struct configfs_attribute *usbg_wwn_attrs[] = {
1643 &usbg_wwn_version.attr,
1644 NULL,
1645};
1646
1647static ssize_t tcm_usbg_tpg_show_enable(
1648 struct se_portal_group *se_tpg,
1649 char *page)
1650{
1651 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1652
1653 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1654}
1655
1656static int usbg_attach(struct usbg_tpg *);
1657static void usbg_detach(struct usbg_tpg *);
1658
1659static ssize_t tcm_usbg_tpg_store_enable(
1660 struct se_portal_group *se_tpg,
1661 const char *page,
1662 size_t count)
1663{
1664 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1665 unsigned long op;
1666 ssize_t ret;
1667
1668 ret = kstrtoul(page, 0, &op);
1669 if (ret < 0)
1670 return -EINVAL;
1671 if (op > 1)
1672 return -EINVAL;
1673
1674 if (op && tpg->gadget_connect)
1675 goto out;
1676 if (!op && !tpg->gadget_connect)
1677 goto out;
1678
1679 if (op) {
1680 ret = usbg_attach(tpg);
1681 if (ret)
1682 goto out;
1683 } else {
1684 usbg_detach(tpg);
1685 }
1686 tpg->gadget_connect = op;
1687out:
1688 return count;
1689}
1690TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1691
1692static ssize_t tcm_usbg_tpg_show_nexus(
1693 struct se_portal_group *se_tpg,
1694 char *page)
1695{
1696 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1697 struct tcm_usbg_nexus *tv_nexus;
1698 ssize_t ret;
1699
1700 mutex_lock(&tpg->tpg_mutex);
1701 tv_nexus = tpg->tpg_nexus;
1702 if (!tv_nexus) {
1703 ret = -ENODEV;
1704 goto out;
1705 }
1706 ret = snprintf(page, PAGE_SIZE, "%s\n",
1707 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1708out:
1709 mutex_unlock(&tpg->tpg_mutex);
1710 return ret;
1711}
1712
1713static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1714{
1715 struct se_portal_group *se_tpg;
1716 struct tcm_usbg_nexus *tv_nexus;
1717 int ret;
1718
1719 mutex_lock(&tpg->tpg_mutex);
1720 if (tpg->tpg_nexus) {
1721 ret = -EEXIST;
1722 pr_debug("tpg->tpg_nexus already exists\n");
1723 goto err_unlock;
1724 }
1725 se_tpg = &tpg->se_tpg;
1726
1727 ret = -ENOMEM;
1728 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1729 if (!tv_nexus) {
1730 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1731 goto err_unlock;
1732 }
1733 tv_nexus->tvn_se_sess = transport_init_session();
1734 if (IS_ERR(tv_nexus->tvn_se_sess))
1735 goto err_free;
1736
1737 /*
1738 * Since we are running in 'demo mode' this call with generate a
1739 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1740 * the SCSI Initiator port name of the passed configfs group 'name'.
1741 */
1742 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1743 se_tpg, name);
1744 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1745 pr_debug("core_tpg_check_initiator_node_acl() failed"
1746 " for %s\n", name);
1747 goto err_session;
1748 }
1749 /*
1750 * Now register the TCM vHost virtual I_T Nexus as active with the
1751 * call to __transport_register_session()
1752 */
1753 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1754 tv_nexus->tvn_se_sess, tv_nexus);
1755 tpg->tpg_nexus = tv_nexus;
1756 mutex_unlock(&tpg->tpg_mutex);
1757 return 0;
1758
1759err_session:
1760 transport_free_session(tv_nexus->tvn_se_sess);
1761err_free:
1762 kfree(tv_nexus);
1763err_unlock:
1764 mutex_unlock(&tpg->tpg_mutex);
1765 return ret;
1766}
1767
1768static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1769{
1770 struct se_session *se_sess;
1771 struct tcm_usbg_nexus *tv_nexus;
1772 int ret = -ENODEV;
1773
1774 mutex_lock(&tpg->tpg_mutex);
1775 tv_nexus = tpg->tpg_nexus;
1776 if (!tv_nexus)
1777 goto out;
1778
1779 se_sess = tv_nexus->tvn_se_sess;
1780 if (!se_sess)
1781 goto out;
1782
1783 if (atomic_read(&tpg->tpg_port_count)) {
1784 ret = -EPERM;
1785 pr_err("Unable to remove Host I_T Nexus with"
1786 " active TPG port count: %d\n",
1787 atomic_read(&tpg->tpg_port_count));
1788 goto out;
1789 }
1790
1791 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1792 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1793 /*
1794 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1795 */
1796 transport_deregister_session(tv_nexus->tvn_se_sess);
1797 tpg->tpg_nexus = NULL;
1798
1799 kfree(tv_nexus);
1800out:
1801 mutex_unlock(&tpg->tpg_mutex);
1802 return 0;
1803}
1804
1805static ssize_t tcm_usbg_tpg_store_nexus(
1806 struct se_portal_group *se_tpg,
1807 const char *page,
1808 size_t count)
1809{
1810 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1811 unsigned char i_port[USBG_NAMELEN], *ptr;
1812 int ret;
1813
1814 if (!strncmp(page, "NULL", 4)) {
1815 ret = tcm_usbg_drop_nexus(tpg);
1816 return (!ret) ? count : ret;
1817 }
1818 if (strlen(page) > USBG_NAMELEN) {
1819 pr_err("Emulated NAA Sas Address: %s, exceeds"
1820 " max: %d\n", page, USBG_NAMELEN);
1821 return -EINVAL;
1822 }
1823 snprintf(i_port, USBG_NAMELEN, "%s", page);
1824
1825 ptr = strstr(i_port, "naa.");
1826 if (!ptr) {
1827 pr_err("Missing 'naa.' prefix\n");
1828 return -EINVAL;
1829 }
1830
1831 if (i_port[strlen(i_port) - 1] == '\n')
1832 i_port[strlen(i_port) - 1] = '\0';
1833
1834 ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1835 if (ret < 0)
1836 return ret;
1837 return count;
1838}
1839TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1840
1841static struct configfs_attribute *usbg_base_attrs[] = {
1842 &tcm_usbg_tpg_enable.attr,
1843 &tcm_usbg_tpg_nexus.attr,
1844 NULL,
1845};
1846
1847static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1848{
1849 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1850
1851 atomic_inc(&tpg->tpg_port_count);
1852 smp_mb__after_atomic_inc();
1853 return 0;
1854}
1855
1856static void usbg_port_unlink(struct se_portal_group *se_tpg,
1857 struct se_lun *se_lun)
1858{
1859 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1860
1861 atomic_dec(&tpg->tpg_port_count);
1862 smp_mb__after_atomic_dec();
1863}
1864
1865static int usbg_check_stop_free(struct se_cmd *se_cmd)
1866{
1867 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1868 se_cmd);
1869
1870 kref_put(&cmd->ref, usbg_cmd_release);
1871 return 1;
1872}
1873
1874static struct target_core_fabric_ops usbg_ops = {
1875 .get_fabric_name = usbg_get_fabric_name,
1876 .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
1877 .tpg_get_wwn = usbg_get_fabric_wwn,
1878 .tpg_get_tag = usbg_get_tag,
1879 .tpg_get_default_depth = usbg_get_default_depth,
1880 .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
1881 .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
1882 .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
1883 .tpg_check_demo_mode = usbg_check_true,
1884 .tpg_check_demo_mode_cache = usbg_check_false,
1885 .tpg_check_demo_mode_write_protect = usbg_check_false,
1886 .tpg_check_prod_mode_write_protect = usbg_check_false,
1887 .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
1888 .tpg_release_fabric_acl = usbg_release_fabric_acl,
1889 .tpg_get_inst_index = usbg_tpg_get_inst_index,
c52661d6
SAS		 1890 .release_cmd = usbg_release_cmd,
1891 .shutdown_session = usbg_shutdown_session,
1892 .close_session = usbg_close_session,
1893 .sess_get_index = usbg_sess_get_index,
1894 .sess_get_initiator_sid = NULL,
1895 .write_pending = usbg_send_write_request,
1896 .write_pending_status = usbg_write_pending_status,
1897 .set_default_node_attributes = usbg_set_default_node_attrs,
1898 .get_task_tag = usbg_get_task_tag,
1899 .get_cmd_state = usbg_get_cmd_state,
1900 .queue_data_in = usbg_send_read_response,
1901 .queue_status = usbg_send_status_response,
1902 .queue_tm_rsp = usbg_queue_tm_rsp,
c52661d6
SAS		 1903 .check_stop_free = usbg_check_stop_free,
1904
1905 .fabric_make_wwn = usbg_make_tport,
1906 .fabric_drop_wwn = usbg_drop_tport,
1907 .fabric_make_tpg = usbg_make_tpg,
1908 .fabric_drop_tpg = usbg_drop_tpg,
1909 .fabric_post_link = usbg_port_link,
1910 .fabric_pre_unlink = usbg_port_unlink,
1911 .fabric_make_np = NULL,
1912 .fabric_drop_np = NULL,
1913 .fabric_make_nodeacl = usbg_make_nodeacl,
1914 .fabric_drop_nodeacl = usbg_drop_nodeacl,
1915};
1916
1917static int usbg_register_configfs(void)
1918{
1919 struct target_fabric_configfs *fabric;
1920 int ret;
1921
1922 fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1923 if (IS_ERR(fabric)) {
1924 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1925 return PTR_ERR(fabric);
1926 }
1927
1928 fabric->tf_ops = usbg_ops;
1929 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1930 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1931 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1932 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1933 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1934 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1935 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1936 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1937 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1938 ret = target_fabric_configfs_register(fabric);
1939 if (ret < 0) {
1940 printk(KERN_ERR "target_fabric_configfs_register() failed"
1941 " for usb-gadget\n");
1942 return ret;
1943 }
1944 usbg_fabric_configfs = fabric;
1945 return 0;
1946};
1947
1948static void usbg_deregister_configfs(void)
1949{
1950 if (!(usbg_fabric_configfs))
1951 return;
1952
1953 target_fabric_configfs_deregister(usbg_fabric_configfs);
1954 usbg_fabric_configfs = NULL;
1955};
1956
1957/* Start gadget.c code */
1958
1959static struct usb_interface_descriptor bot_intf_desc = {
1960 .bLength = sizeof(bot_intf_desc),
1961 .bDescriptorType = USB_DT_INTERFACE,
c52661d6
SAS		 1962 .bNumEndpoints = 2,
1963 .bAlternateSetting = USB_G_ALT_INT_BBB,
1964 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1965 .bInterfaceSubClass = USB_SC_SCSI,
1966 .bInterfaceProtocol = USB_PR_BULK,
1967 .iInterface = USB_G_STR_INT_UAS,
1968};
1969
1970static struct usb_interface_descriptor uasp_intf_desc = {
1971 .bLength = sizeof(uasp_intf_desc),
1972 .bDescriptorType = USB_DT_INTERFACE,
1973 .bNumEndpoints = 4,
1974 .bAlternateSetting = USB_G_ALT_INT_UAS,
1975 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1976 .bInterfaceSubClass = USB_SC_SCSI,
1977 .bInterfaceProtocol = USB_PR_UAS,
1978 .iInterface = USB_G_STR_INT_BBB,
1979};
1980
1981static struct usb_endpoint_descriptor uasp_bi_desc = {
1982 .bLength = USB_DT_ENDPOINT_SIZE,
1983 .bDescriptorType = USB_DT_ENDPOINT,
1984 .bEndpointAddress = USB_DIR_IN,
1985 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1986 .wMaxPacketSize = cpu_to_le16(512),
1987};
1988
1989static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1990 .bLength = USB_DT_ENDPOINT_SIZE,
1991 .bDescriptorType = USB_DT_ENDPOINT,
1992 .bEndpointAddress = USB_DIR_IN,
1993 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1994};
1995
1996static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1997 .bLength = sizeof(uasp_bi_pipe_desc),
1998 .bDescriptorType = USB_DT_PIPE_USAGE,
1999 .bPipeID = DATA_IN_PIPE_ID,
2000};
2001
2002static struct usb_endpoint_descriptor uasp_ss_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 .wMaxPacketSize = cpu_to_le16(1024),
2008};
2009
2010static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2011 .bLength = sizeof(uasp_bi_ep_comp_desc),
2012 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2013 .bMaxBurst = 0,
2014 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2015 .wBytesPerInterval = 0,
2016};
2017
2018static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2019 .bLength = sizeof(bot_bi_ep_comp_desc),
2020 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2021 .bMaxBurst = 0,
2022};
2023
2024static struct usb_endpoint_descriptor uasp_bo_desc = {
2025 .bLength = USB_DT_ENDPOINT_SIZE,
2026 .bDescriptorType = USB_DT_ENDPOINT,
2027 .bEndpointAddress = USB_DIR_OUT,
2028 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2029 .wMaxPacketSize = cpu_to_le16(512),
2030};
2031
2032static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2033 .bLength = USB_DT_ENDPOINT_SIZE,
2034 .bDescriptorType = USB_DT_ENDPOINT,
2035 .bEndpointAddress = USB_DIR_OUT,
2036 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2037};
2038
2039static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2040 .bLength = sizeof(uasp_bo_pipe_desc),
2041 .bDescriptorType = USB_DT_PIPE_USAGE,
2042 .bPipeID = DATA_OUT_PIPE_ID,
2043};
2044
2045static struct usb_endpoint_descriptor uasp_ss_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 .wMaxPacketSize = cpu_to_le16(0x400),
2051};
2052
2053static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2054 .bLength = sizeof(uasp_bo_ep_comp_desc),
2055 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2056 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2057};
2058
2059static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2060 .bLength = sizeof(bot_bo_ep_comp_desc),
2061 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2062};
2063
2064static struct usb_endpoint_descriptor uasp_status_desc = {
2065 .bLength = USB_DT_ENDPOINT_SIZE,
2066 .bDescriptorType = USB_DT_ENDPOINT,
2067 .bEndpointAddress = USB_DIR_IN,
2068 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2069 .wMaxPacketSize = cpu_to_le16(512),
2070};
2071
2072static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2073 .bLength = USB_DT_ENDPOINT_SIZE,
2074 .bDescriptorType = USB_DT_ENDPOINT,
2075 .bEndpointAddress = USB_DIR_IN,
2076 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2077};
2078
2079static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2080 .bLength = sizeof(uasp_status_pipe_desc),
2081 .bDescriptorType = USB_DT_PIPE_USAGE,
2082 .bPipeID = STATUS_PIPE_ID,
2083};
2084
2085static struct usb_endpoint_descriptor uasp_ss_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 .wMaxPacketSize = cpu_to_le16(1024),
2091};
2092
2093static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2094 .bLength = sizeof(uasp_status_in_ep_comp_desc),
2095 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2096 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2097};
2098
2099static struct usb_endpoint_descriptor uasp_cmd_desc = {
2100 .bLength = USB_DT_ENDPOINT_SIZE,
2101 .bDescriptorType = USB_DT_ENDPOINT,
2102 .bEndpointAddress = USB_DIR_OUT,
2103 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2104 .wMaxPacketSize = cpu_to_le16(512),
2105};
2106
2107static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2108 .bLength = USB_DT_ENDPOINT_SIZE,
2109 .bDescriptorType = USB_DT_ENDPOINT,
2110 .bEndpointAddress = USB_DIR_OUT,
2111 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2112};
2113
2114static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2115 .bLength = sizeof(uasp_cmd_pipe_desc),
2116 .bDescriptorType = USB_DT_PIPE_USAGE,
2117 .bPipeID = CMD_PIPE_ID,
2118};
2119
2120static struct usb_endpoint_descriptor uasp_ss_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 .wMaxPacketSize = cpu_to_le16(1024),
2126};
2127
2128static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2129 .bLength = sizeof(uasp_cmd_comp_desc),
2130 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2131};
2132
2133static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2134 (struct usb_descriptor_header *) &bot_intf_desc,
2135 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2136 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2137
2138 (struct usb_descriptor_header *) &uasp_intf_desc,
2139 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2140 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2141 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2142 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2143 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2144 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2145 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2146 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2147};
2148
2149static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2150 (struct usb_descriptor_header *) &bot_intf_desc,
2151 (struct usb_descriptor_header *) &uasp_bi_desc,
2152 (struct usb_descriptor_header *) &uasp_bo_desc,
2153
2154 (struct usb_descriptor_header *) &uasp_intf_desc,
2155 (struct usb_descriptor_header *) &uasp_bi_desc,
2156 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2157 (struct usb_descriptor_header *) &uasp_bo_desc,
2158 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2159 (struct usb_descriptor_header *) &uasp_status_desc,
2160 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2161 (struct usb_descriptor_header *) &uasp_cmd_desc,
2162 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2163 NULL,
2164};
2165
2166static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2167 (struct usb_descriptor_header *) &bot_intf_desc,
2168 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2169 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2170 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2171 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2172
2173 (struct usb_descriptor_header *) &uasp_intf_desc,
2174 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2175 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2176 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2177 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2178 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2179 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2180 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2181 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2182 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2183 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2184 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2185 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2186 NULL,
2187};
2188
2189#define UAS_VENDOR_ID 0x0525 /* NetChip */
2190#define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
2191
2192static struct usb_device_descriptor usbg_device_desc = {
2193 .bLength = sizeof(usbg_device_desc),
2194 .bDescriptorType = USB_DT_DEVICE,
2195 .bcdUSB = cpu_to_le16(0x0200),
2196 .bDeviceClass = USB_CLASS_PER_INTERFACE,
2197 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
2198 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
2199 .iManufacturer = USB_G_STR_MANUFACTOR,
2200 .iProduct = USB_G_STR_PRODUCT,
2201 .iSerialNumber = USB_G_STR_SERIAL,
2202
2203 .bNumConfigurations = 1,
2204};
2205
2206static struct usb_string usbg_us_strings[] = {
2207 { USB_G_STR_MANUFACTOR, "Target Manufactor"},
2208 { USB_G_STR_PRODUCT, "Target Product"},
2209 { USB_G_STR_SERIAL, "000000000001"},
2210 { USB_G_STR_CONFIG, "default config"},
2211 { USB_G_STR_INT_UAS, "USB Attached SCSI"},
2212 { USB_G_STR_INT_BBB, "Bulk Only Transport"},
2213 { },
2214};
2215
2216static struct usb_gadget_strings usbg_stringtab = {
2217 .language = 0x0409,
2218 .strings = usbg_us_strings,
2219};
2220
2221static struct usb_gadget_strings *usbg_strings[] = {
2222 &usbg_stringtab,
2223 NULL,
2224};
2225
2226static int guas_unbind(struct usb_composite_dev *cdev)
2227{
2228 return 0;
2229}
2230
2231static struct usb_configuration usbg_config_driver = {
2232 .label = "Linux Target",
2233 .bConfigurationValue = 1,
2234 .iConfiguration = USB_G_STR_CONFIG,
2235 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2236};
2237
2238static void give_back_ep(struct usb_ep **pep)
2239{
2240 struct usb_ep *ep = *pep;
2241 if (!ep)
2242 return;
2243 ep->driver_data = NULL;
2244}
2245
2246static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2247{
2248 struct f_uas *fu = to_f_uas(f);
2249 struct usb_gadget *gadget = c->cdev->gadget;
2250 struct usb_ep *ep;
2251 int iface;
2252
2253 iface = usb_interface_id(c, f);
2254 if (iface < 0)
2255 return iface;
2256
2257 bot_intf_desc.bInterfaceNumber = iface;
2258 uasp_intf_desc.bInterfaceNumber = iface;
2259 fu->iface = iface;
2260 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2261 &uasp_bi_ep_comp_desc);
2262 if (!ep)
2263 goto ep_fail;
2264
2265 ep->driver_data = fu;
2266 fu->ep_in = ep;
2267
2268 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2269 &uasp_bo_ep_comp_desc);
2270 if (!ep)
2271 goto ep_fail;
2272 ep->driver_data = fu;
2273 fu->ep_out = ep;
2274
2275 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2276 &uasp_status_in_ep_comp_desc);
2277 if (!ep)
2278 goto ep_fail;
2279 ep->driver_data = fu;
2280 fu->ep_status = ep;
2281
2282 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2283 &uasp_cmd_comp_desc);
2284 if (!ep)
2285 goto ep_fail;
2286 ep->driver_data = fu;
2287 fu->ep_cmd = ep;
2288
2289 /* Assume endpoint addresses are the same for both speeds */
2290 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2291 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2292 uasp_status_desc.bEndpointAddress =
2293 uasp_ss_status_desc.bEndpointAddress;
2294 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2295
2296 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2297 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2298 uasp_fs_status_desc.bEndpointAddress =
2299 uasp_ss_status_desc.bEndpointAddress;
2300 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2301
2302 return 0;
2303ep_fail:
2304 pr_err("Can't claim all required eps\n");
2305
2306 give_back_ep(&fu->ep_in);
2307 give_back_ep(&fu->ep_out);
2308 give_back_ep(&fu->ep_status);
2309 give_back_ep(&fu->ep_cmd);
2310 return -ENOTSUPP;
2311}
2312
2313static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2314{
2315 struct f_uas *fu = to_f_uas(f);
2316
2317 kfree(fu);
2318}
2319
2320struct guas_setup_wq {
2321 struct work_struct work;
2322 struct f_uas *fu;
2323 unsigned int alt;
2324};
2325
2326static void usbg_delayed_set_alt(struct work_struct *wq)
2327{
2328 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2329 work);
2330 struct f_uas *fu = work->fu;
2331 int alt = work->alt;
2332
2333 kfree(work);
2334
2335 if (fu->flags & USBG_IS_BOT)
2336 bot_cleanup_old_alt(fu);
2337 if (fu->flags & USBG_IS_UAS)
2338 uasp_cleanup_old_alt(fu);
2339
2340 if (alt == USB_G_ALT_INT_BBB)
2341 bot_set_alt(fu);
2342 else if (alt == USB_G_ALT_INT_UAS)
2343 uasp_set_alt(fu);
2344 usb_composite_setup_continue(fu->function.config->cdev);
2345}
2346
2347static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2348{
2349 struct f_uas *fu = to_f_uas(f);
2350
2351 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2352 struct guas_setup_wq *work;
2353
2354 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2355 if (!work)
2356 return -ENOMEM;
2357 INIT_WORK(&work->work, usbg_delayed_set_alt);
2358 work->fu = fu;
2359 work->alt = alt;
2360 schedule_work(&work->work);
2361 return USB_GADGET_DELAYED_STATUS;
2362 }
2363 return -EOPNOTSUPP;
2364}
2365
2366static void usbg_disable(struct usb_function *f)
2367{
2368 struct f_uas *fu = to_f_uas(f);
2369
2370 if (fu->flags & USBG_IS_UAS)
2371 uasp_cleanup_old_alt(fu);
2372 else if (fu->flags & USBG_IS_BOT)
2373 bot_cleanup_old_alt(fu);
2374 fu->flags = 0;
2375}
2376
2377static int usbg_setup(struct usb_function *f,
2378 const struct usb_ctrlrequest *ctrl)
2379{
2380 struct f_uas *fu = to_f_uas(f);
2381
2382 if (!(fu->flags & USBG_IS_BOT))
2383 return -EOPNOTSUPP;
2384
2385 return usbg_bot_setup(f, ctrl);
2386}
2387
2388static int usbg_cfg_bind(struct usb_configuration *c)
2389{
2390 struct f_uas *fu;
2391 int ret;
2392
2393 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2394 if (!fu)
2395 return -ENOMEM;
2396 fu->function.name = "Target Function";
2397 fu->function.descriptors = uasp_fs_function_desc;
2398 fu->function.hs_descriptors = uasp_hs_function_desc;
2399 fu->function.ss_descriptors = uasp_ss_function_desc;
2400 fu->function.bind = usbg_bind;
2401 fu->function.unbind = usbg_unbind;
2402 fu->function.set_alt = usbg_set_alt;
2403 fu->function.setup = usbg_setup;
2404 fu->function.disable = usbg_disable;
2405 fu->tpg = the_only_tpg_I_currently_have;
2406
2407 ret = usb_add_function(c, &fu->function);
2408 if (ret)
2409 goto err;
2410
2411 return 0;
2412err:
2413 kfree(fu);
2414 return ret;
2415}
2416
2417static int usb_target_bind(struct usb_composite_dev *cdev)
2418{
2419 int ret;
2420
2421 ret = usb_add_config(cdev, &usbg_config_driver,
2422 usbg_cfg_bind);
2423 return 0;
2424}
2425
2426static struct usb_composite_driver usbg_driver = {
2427 .name = "g_target",
2428 .dev = &usbg_device_desc,
2429 .strings = usbg_strings,
2430 .max_speed = USB_SPEED_SUPER,
2431 .unbind = guas_unbind,
2432};
2433
2434static int usbg_attach(struct usbg_tpg *tpg)
2435{
2436 return usb_composite_probe(&usbg_driver, usb_target_bind);
2437}
2438
2439static void usbg_detach(struct usbg_tpg *tpg)
2440{
2441 usb_composite_unregister(&usbg_driver);
2442}
2443
2444static int __init usb_target_gadget_init(void)
2445{
2446 int ret;
2447
2448 ret = usbg_register_configfs();
2449 return ret;
2450}
2451module_init(usb_target_gadget_init);
2452
2453static void __exit usb_target_gadget_exit(void)
2454{
2455 usbg_deregister_configfs();
2456}
2457module_exit(usb_target_gadget_exit);
2458
2459MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2460MODULE_DESCRIPTION("usb-gadget fabric");
2461MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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