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scsi: remove scsi_driver owner field
[linux-2.6-block.git] / drivers / usb / gadget / legacy / 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
c52661d6
SAS		 28#include "tcm_usb_gadget.h"
29
7d16e8d3
SAS		 30USB_GADGET_COMPOSITE_OPTIONS();
31
c52661d6
SAS		 32static struct target_fabric_configfs *usbg_fabric_configfs;
33
34static inline struct f_uas *to_f_uas(struct usb_function *f)
35{
36 return container_of(f, struct f_uas, function);
37}
38
39static void usbg_cmd_release(struct kref *);
40
41static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
42{
43 kref_put(&cmd->ref, usbg_cmd_release);
44}
45
46/* Start bot.c code */
47
48static int bot_enqueue_cmd_cbw(struct f_uas *fu)
49{
50 int ret;
51
52 if (fu->flags & USBG_BOT_CMD_PEND)
53 return 0;
54
55 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
56 if (!ret)
57 fu->flags |= USBG_BOT_CMD_PEND;
58 return ret;
59}
60
61static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
62{
63 struct usbg_cmd *cmd = req->context;
64 struct f_uas *fu = cmd->fu;
65
66 usbg_cleanup_cmd(cmd);
67 if (req->status < 0) {
68 pr_err("ERR %s(%d)\n", __func__, __LINE__);
69 return;
70 }
71
72 /* CSW completed, wait for next CBW */
73 bot_enqueue_cmd_cbw(fu);
74}
75
76static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
77{
78 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
79 int ret;
80 u8 *sense;
81 unsigned int csw_stat;
82
83 csw_stat = cmd->csw_code;
84
85 /*
86 * We can't send SENSE as a response. So we take ASC & ASCQ from our
87 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
88 * command where it learns why we failed.
89 */
90 sense = cmd->sense_iu.sense;
91
92 csw->Tag = cmd->bot_tag;
93 csw->Status = csw_stat;
94 fu->bot_status.req->context = cmd;
95 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
96 if (ret)
97 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
98}
99
100static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
101{
102 struct usbg_cmd *cmd = req->context;
103 struct f_uas *fu = cmd->fu;
104
105 if (req->status < 0)
106 pr_err("ERR %s(%d)\n", __func__, __LINE__);
107
108 if (cmd->data_len) {
109 if (cmd->data_len > ep->maxpacket) {
110 req->length = ep->maxpacket;
111 cmd->data_len -= ep->maxpacket;
112 } else {
113 req->length = cmd->data_len;
114 cmd->data_len = 0;
115 }
116
117 usb_ep_queue(ep, req, GFP_ATOMIC);
118 return ;
119 }
120 bot_enqueue_sense_code(fu, cmd);
121}
122
123static void bot_send_bad_status(struct usbg_cmd *cmd)
124{
125 struct f_uas *fu = cmd->fu;
126 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
127 struct usb_request *req;
128 struct usb_ep *ep;
129
130 csw->Residue = cpu_to_le32(cmd->data_len);
131
132 if (cmd->data_len) {
133 if (cmd->is_read) {
134 ep = fu->ep_in;
135 req = fu->bot_req_in;
136 } else {
137 ep = fu->ep_out;
138 req = fu->bot_req_out;
139 }
140
141 if (cmd->data_len > fu->ep_in->maxpacket) {
142 req->length = ep->maxpacket;
143 cmd->data_len -= ep->maxpacket;
144 } else {
145 req->length = cmd->data_len;
146 cmd->data_len = 0;
147 }
148 req->complete = bot_err_compl;
149 req->context = cmd;
150 req->buf = fu->cmd.buf;
151 usb_ep_queue(ep, req, GFP_KERNEL);
152 } else {
153 bot_enqueue_sense_code(fu, cmd);
154 }
155}
156
157static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
158{
159 struct f_uas *fu = cmd->fu;
160 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
161 int ret;
162
163 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
164 if (!moved_data && cmd->data_len) {
165 /*
166 * the host wants to move data, we don't. Fill / empty
167 * the pipe and then send the csw with reside set.
168 */
169 cmd->csw_code = US_BULK_STAT_OK;
170 bot_send_bad_status(cmd);
171 return 0;
172 }
173
174 csw->Tag = cmd->bot_tag;
175 csw->Residue = cpu_to_le32(0);
176 csw->Status = US_BULK_STAT_OK;
177 fu->bot_status.req->context = cmd;
178
179 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
180 if (ret)
181 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
182 } else {
183 cmd->csw_code = US_BULK_STAT_FAIL;
184 bot_send_bad_status(cmd);
185 }
186 return 0;
187}
188
189/*
190 * Called after command (no data transfer) or after the write (to device)
191 * operation is completed
192 */
193static int bot_send_status_response(struct usbg_cmd *cmd)
194{
195 bool moved_data = false;
196
197 if (!cmd->is_read)
198 moved_data = true;
199 return bot_send_status(cmd, moved_data);
200}
201
202/* Read request completed, now we have to send the CSW */
203static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
204{
205 struct usbg_cmd *cmd = req->context;
206
207 if (req->status < 0)
208 pr_err("ERR %s(%d)\n", __func__, __LINE__);
209
210 bot_send_status(cmd, true);
211}
212
213static int bot_send_read_response(struct usbg_cmd *cmd)
214{
215 struct f_uas *fu = cmd->fu;
216 struct se_cmd *se_cmd = &cmd->se_cmd;
217 struct usb_gadget *gadget = fuas_to_gadget(fu);
218 int ret;
219
220 if (!cmd->data_len) {
221 cmd->csw_code = US_BULK_STAT_PHASE;
222 bot_send_bad_status(cmd);
223 return 0;
224 }
225
226 if (!gadget->sg_supported) {
227 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
228 if (!cmd->data_buf)
229 return -ENOMEM;
230
231 sg_copy_to_buffer(se_cmd->t_data_sg,
232 se_cmd->t_data_nents,
233 cmd->data_buf,
234 se_cmd->data_length);
235
236 fu->bot_req_in->buf = cmd->data_buf;
237 } else {
238 fu->bot_req_in->buf = NULL;
239 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
240 fu->bot_req_in->sg = se_cmd->t_data_sg;
241 }
242
243 fu->bot_req_in->complete = bot_read_compl;
244 fu->bot_req_in->length = se_cmd->data_length;
245 fu->bot_req_in->context = cmd;
246 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
247 if (ret)
248 pr_err("%s(%d)\n", __func__, __LINE__);
249 return 0;
250}
251
252static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
253static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
254
255static int bot_send_write_request(struct usbg_cmd *cmd)
256{
257 struct f_uas *fu = cmd->fu;
258 struct se_cmd *se_cmd = &cmd->se_cmd;
259 struct usb_gadget *gadget = fuas_to_gadget(fu);
260 int ret;
261
262 init_completion(&cmd->write_complete);
263 cmd->fu = fu;
264
265 if (!cmd->data_len) {
266 cmd->csw_code = US_BULK_STAT_PHASE;
267 return -EINVAL;
268 }
269
270 if (!gadget->sg_supported) {
271 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
272 if (!cmd->data_buf)
273 return -ENOMEM;
274
275 fu->bot_req_out->buf = cmd->data_buf;
276 } else {
277 fu->bot_req_out->buf = NULL;
278 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
279 fu->bot_req_out->sg = se_cmd->t_data_sg;
280 }
281
282 fu->bot_req_out->complete = usbg_data_write_cmpl;
283 fu->bot_req_out->length = se_cmd->data_length;
284 fu->bot_req_out->context = cmd;
285
286 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
287 if (ret)
288 goto cleanup;
289 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
290 if (ret)
291 pr_err("%s(%d)\n", __func__, __LINE__);
292
293 wait_for_completion(&cmd->write_complete);
70baf0ab 294 target_execute_cmd(se_cmd);
c52661d6
SAS		 295cleanup:
296 return ret;
297}
298
299static int bot_submit_command(struct f_uas *, void *, unsigned int);
300
301static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
302{
303 struct f_uas *fu = req->context;
304 int ret;
305
306 fu->flags &= ~USBG_BOT_CMD_PEND;
307
308 if (req->status < 0)
309 return;
310
311 ret = bot_submit_command(fu, req->buf, req->actual);
312 if (ret)
313 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
314}
315
316static int bot_prepare_reqs(struct f_uas *fu)
317{
318 int ret;
319
320 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
321 if (!fu->bot_req_in)
322 goto err;
323
324 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
325 if (!fu->bot_req_out)
326 goto err_out;
327
328 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
329 if (!fu->cmd.req)
330 goto err_cmd;
331
332 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
333 if (!fu->bot_status.req)
334 goto err_sts;
335
336 fu->bot_status.req->buf = &fu->bot_status.csw;
337 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
338 fu->bot_status.req->complete = bot_status_complete;
339 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
340
341 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
342 if (!fu->cmd.buf)
343 goto err_buf;
344
345 fu->cmd.req->complete = bot_cmd_complete;
346 fu->cmd.req->buf = fu->cmd.buf;
347 fu->cmd.req->length = fu->ep_out->maxpacket;
348 fu->cmd.req->context = fu;
349
350 ret = bot_enqueue_cmd_cbw(fu);
351 if (ret)
352 goto err_queue;
353 return 0;
354err_queue:
355 kfree(fu->cmd.buf);
356 fu->cmd.buf = NULL;
357err_buf:
358 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
359err_sts:
360 usb_ep_free_request(fu->ep_out, fu->cmd.req);
361 fu->cmd.req = NULL;
362err_cmd:
363 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
364 fu->bot_req_out = NULL;
365err_out:
366 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
367 fu->bot_req_in = NULL;
368err:
369 pr_err("BOT: endpoint setup failed\n");
370 return -ENOMEM;
371}
372
3f79265c 373static void bot_cleanup_old_alt(struct f_uas *fu)
c52661d6
SAS		 374{
375 if (!(fu->flags & USBG_ENABLED))
376 return;
377
378 usb_ep_disable(fu->ep_in);
379 usb_ep_disable(fu->ep_out);
380
381 if (!fu->bot_req_in)
382 return;
383
384 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
385 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
386 usb_ep_free_request(fu->ep_out, fu->cmd.req);
387 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
388
389 kfree(fu->cmd.buf);
390
391 fu->bot_req_in = NULL;
392 fu->bot_req_out = NULL;
393 fu->cmd.req = NULL;
394 fu->bot_status.req = NULL;
395 fu->cmd.buf = NULL;
396}
397
398static void bot_set_alt(struct f_uas *fu)
399{
400 struct usb_function *f = &fu->function;
401 struct usb_gadget *gadget = f->config->cdev->gadget;
402 int ret;
403
404 fu->flags = USBG_IS_BOT;
405
406 config_ep_by_speed(gadget, f, fu->ep_in);
407 ret = usb_ep_enable(fu->ep_in);
408 if (ret)
409 goto err_b_in;
410
411 config_ep_by_speed(gadget, f, fu->ep_out);
412 ret = usb_ep_enable(fu->ep_out);
413 if (ret)
414 goto err_b_out;
415
416 ret = bot_prepare_reqs(fu);
417 if (ret)
418 goto err_wq;
419 fu->flags |= USBG_ENABLED;
420 pr_info("Using the BOT protocol\n");
421 return;
422err_wq:
423 usb_ep_disable(fu->ep_out);
424err_b_out:
425 usb_ep_disable(fu->ep_in);
426err_b_in:
427 fu->flags = USBG_IS_BOT;
428}
429
430static int usbg_bot_setup(struct usb_function *f,
431 const struct usb_ctrlrequest *ctrl)
432{
433 struct f_uas *fu = to_f_uas(f);
434 struct usb_composite_dev *cdev = f->config->cdev;
435 u16 w_value = le16_to_cpu(ctrl->wValue);
436 u16 w_length = le16_to_cpu(ctrl->wLength);
437 int luns;
438 u8 *ret_lun;
439
440 switch (ctrl->bRequest) {
441 case US_BULK_GET_MAX_LUN:
442 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
443 USB_RECIP_INTERFACE))
444 return -ENOTSUPP;
445
446 if (w_length < 1)
447 return -EINVAL;
448 if (w_value != 0)
449 return -EINVAL;
450 luns = atomic_read(&fu->tpg->tpg_port_count);
451 if (!luns) {
452 pr_err("No LUNs configured?\n");
453 return -EINVAL;
454 }
455 /*
456 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
457 * accessed. The upper limit is 0xf
458 */
459 luns--;
460 if (luns > 0xf) {
461 pr_info_once("Limiting the number of luns to 16\n");
462 luns = 0xf;
463 }
464 ret_lun = cdev->req->buf;
465 *ret_lun = luns;
466 cdev->req->length = 1;
467 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
468 break;
469
470 case US_BULK_RESET_REQUEST:
471 /* XXX maybe we should remove previous requests for IN + OUT */
472 bot_enqueue_cmd_cbw(fu);
473 return 0;
474 break;
2b84f92b 475 }
c52661d6
SAS		 476 return -ENOTSUPP;
477}
478
479/* Start uas.c code */
480
481static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
482{
483 /* We have either all three allocated or none */
484 if (!stream->req_in)
485 return;
486
487 usb_ep_free_request(fu->ep_in, stream->req_in);
488 usb_ep_free_request(fu->ep_out, stream->req_out);
489 usb_ep_free_request(fu->ep_status, stream->req_status);
490
491 stream->req_in = NULL;
492 stream->req_out = NULL;
493 stream->req_status = NULL;
494}
495
496static void uasp_free_cmdreq(struct f_uas *fu)
497{
498 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
499 kfree(fu->cmd.buf);
500 fu->cmd.req = NULL;
501 fu->cmd.buf = NULL;
502}
503
504static void uasp_cleanup_old_alt(struct f_uas *fu)
505{
506 int i;
507
508 if (!(fu->flags & USBG_ENABLED))
509 return;
510
511 usb_ep_disable(fu->ep_in);
512 usb_ep_disable(fu->ep_out);
513 usb_ep_disable(fu->ep_status);
514 usb_ep_disable(fu->ep_cmd);
515
516 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
517 uasp_cleanup_one_stream(fu, &fu->stream[i]);
518 uasp_free_cmdreq(fu);
519}
520
521static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
522
523static int uasp_prepare_r_request(struct usbg_cmd *cmd)
524{
525 struct se_cmd *se_cmd = &cmd->se_cmd;
526 struct f_uas *fu = cmd->fu;
527 struct usb_gadget *gadget = fuas_to_gadget(fu);
528 struct uas_stream *stream = cmd->stream;
529
530 if (!gadget->sg_supported) {
531 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
532 if (!cmd->data_buf)
533 return -ENOMEM;
534
535 sg_copy_to_buffer(se_cmd->t_data_sg,
536 se_cmd->t_data_nents,
537 cmd->data_buf,
538 se_cmd->data_length);
539
540 stream->req_in->buf = cmd->data_buf;
541 } else {
542 stream->req_in->buf = NULL;
543 stream->req_in->num_sgs = se_cmd->t_data_nents;
544 stream->req_in->sg = se_cmd->t_data_sg;
545 }
546
547 stream->req_in->complete = uasp_status_data_cmpl;
548 stream->req_in->length = se_cmd->data_length;
549 stream->req_in->context = cmd;
550
551 cmd->state = UASP_SEND_STATUS;
552 return 0;
553}
554
555static void uasp_prepare_status(struct usbg_cmd *cmd)
556{
557 struct se_cmd *se_cmd = &cmd->se_cmd;
558 struct sense_iu *iu = &cmd->sense_iu;
559 struct uas_stream *stream = cmd->stream;
560
561 cmd->state = UASP_QUEUE_COMMAND;
562 iu->iu_id = IU_ID_STATUS;
563 iu->tag = cpu_to_be16(cmd->tag);
564
565 /*
566 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
567 */
568 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
569 iu->status = se_cmd->scsi_status;
570 stream->req_status->context = cmd;
571 stream->req_status->length = se_cmd->scsi_sense_length + 16;
572 stream->req_status->buf = iu;
573 stream->req_status->complete = uasp_status_data_cmpl;
574}
575
576static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
577{
578 struct usbg_cmd *cmd = req->context;
579 struct uas_stream *stream = cmd->stream;
580 struct f_uas *fu = cmd->fu;
581 int ret;
582
583 if (req->status < 0)
584 goto cleanup;
585
586 switch (cmd->state) {
587 case UASP_SEND_DATA:
588 ret = uasp_prepare_r_request(cmd);
589 if (ret)
590 goto cleanup;
591 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
592 if (ret)
593 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
594 break;
595
596 case UASP_RECEIVE_DATA:
597 ret = usbg_prepare_w_request(cmd, stream->req_out);
598 if (ret)
599 goto cleanup;
600 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
601 if (ret)
602 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
603 break;
604
605 case UASP_SEND_STATUS:
606 uasp_prepare_status(cmd);
607 ret = usb_ep_queue(fu->ep_status, stream->req_status,
608 GFP_ATOMIC);
609 if (ret)
610 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
611 break;
612
613 case UASP_QUEUE_COMMAND:
614 usbg_cleanup_cmd(cmd);
615 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
616 break;
617
618 default:
619 BUG();
2b84f92b 620 }
c52661d6
SAS		 621 return;
622
623cleanup:
624 usbg_cleanup_cmd(cmd);
625}
626
627static int uasp_send_status_response(struct usbg_cmd *cmd)
628{
629 struct f_uas *fu = cmd->fu;
630 struct uas_stream *stream = cmd->stream;
631 struct sense_iu *iu = &cmd->sense_iu;
632
633 iu->tag = cpu_to_be16(cmd->tag);
634 stream->req_status->complete = uasp_status_data_cmpl;
635 stream->req_status->context = cmd;
636 cmd->fu = fu;
637 uasp_prepare_status(cmd);
638 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
639}
640
641static int uasp_send_read_response(struct usbg_cmd *cmd)
642{
643 struct f_uas *fu = cmd->fu;
644 struct uas_stream *stream = cmd->stream;
645 struct sense_iu *iu = &cmd->sense_iu;
646 int ret;
647
648 cmd->fu = fu;
649
650 iu->tag = cpu_to_be16(cmd->tag);
651 if (fu->flags & USBG_USE_STREAMS) {
652
653 ret = uasp_prepare_r_request(cmd);
654 if (ret)
655 goto out;
656 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
657 if (ret) {
658 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
659 kfree(cmd->data_buf);
660 cmd->data_buf = NULL;
661 }
662
663 } else {
664
665 iu->iu_id = IU_ID_READ_READY;
666 iu->tag = cpu_to_be16(cmd->tag);
667
668 stream->req_status->complete = uasp_status_data_cmpl;
669 stream->req_status->context = cmd;
670
671 cmd->state = UASP_SEND_DATA;
672 stream->req_status->buf = iu;
673 stream->req_status->length = sizeof(struct iu);
674
675 ret = usb_ep_queue(fu->ep_status, stream->req_status,
676 GFP_ATOMIC);
677 if (ret)
678 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
679 }
680out:
681 return ret;
682}
683
684static int uasp_send_write_request(struct usbg_cmd *cmd)
685{
686 struct f_uas *fu = cmd->fu;
687 struct se_cmd *se_cmd = &cmd->se_cmd;
688 struct uas_stream *stream = cmd->stream;
689 struct sense_iu *iu = &cmd->sense_iu;
690 int ret;
691
692 init_completion(&cmd->write_complete);
693 cmd->fu = fu;
694
695 iu->tag = cpu_to_be16(cmd->tag);
696
697 if (fu->flags & USBG_USE_STREAMS) {
698
699 ret = usbg_prepare_w_request(cmd, stream->req_out);
700 if (ret)
701 goto cleanup;
702 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
703 if (ret)
704 pr_err("%s(%d)\n", __func__, __LINE__);
705
706 } else {
707
708 iu->iu_id = IU_ID_WRITE_READY;
709 iu->tag = cpu_to_be16(cmd->tag);
710
711 stream->req_status->complete = uasp_status_data_cmpl;
712 stream->req_status->context = cmd;
713
714 cmd->state = UASP_RECEIVE_DATA;
715 stream->req_status->buf = iu;
716 stream->req_status->length = sizeof(struct iu);
717
718 ret = usb_ep_queue(fu->ep_status, stream->req_status,
719 GFP_ATOMIC);
720 if (ret)
721 pr_err("%s(%d)\n", __func__, __LINE__);
722 }
723
724 wait_for_completion(&cmd->write_complete);
70baf0ab 725 target_execute_cmd(se_cmd);
c52661d6
SAS		 726cleanup:
727 return ret;
728}
729
730static int usbg_submit_command(struct f_uas *, void *, unsigned int);
731
732static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
733{
734 struct f_uas *fu = req->context;
735 int ret;
736
737 if (req->status < 0)
738 return;
739
740 ret = usbg_submit_command(fu, req->buf, req->actual);
741 /*
742 * Once we tune for performance enqueue the command req here again so
743 * we can receive a second command while we processing this one. Pay
744 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
745 * don't break HS.
746 */
747 if (!ret)
748 return;
749 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
750}
751
752static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
753{
754 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
755 if (!stream->req_in)
756 goto out;
757
758 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
759 if (!stream->req_out)
760 goto err_out;
761
762 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
763 if (!stream->req_status)
764 goto err_sts;
765
766 return 0;
767err_sts:
768 usb_ep_free_request(fu->ep_status, stream->req_status);
769 stream->req_status = NULL;
770err_out:
771 usb_ep_free_request(fu->ep_out, stream->req_out);
772 stream->req_out = NULL;
773out:
774 return -ENOMEM;
775}
776
777static int uasp_alloc_cmd(struct f_uas *fu)
778{
779 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
780 if (!fu->cmd.req)
781 goto err;
782
783 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
784 if (!fu->cmd.buf)
785 goto err_buf;
786
787 fu->cmd.req->complete = uasp_cmd_complete;
788 fu->cmd.req->buf = fu->cmd.buf;
789 fu->cmd.req->length = fu->ep_cmd->maxpacket;
790 fu->cmd.req->context = fu;
791 return 0;
792
793err_buf:
794 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
795err:
796 return -ENOMEM;
797}
798
799static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
800{
801 int i;
802
803 for (i = 0; i < max_streams; i++) {
804 struct uas_stream *s = &fu->stream[i];
805
806 s->req_in->stream_id = i + 1;
807 s->req_out->stream_id = i + 1;
808 s->req_status->stream_id = i + 1;
809 }
810}
811
812static int uasp_prepare_reqs(struct f_uas *fu)
813{
814 int ret;
815 int i;
816 int max_streams;
817
818 if (fu->flags & USBG_USE_STREAMS)
819 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
820 else
821 max_streams = 1;
822
823 for (i = 0; i < max_streams; i++) {
824 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
825 if (ret)
826 goto err_cleanup;
827 }
828
829 ret = uasp_alloc_cmd(fu);
830 if (ret)
831 goto err_free_stream;
832 uasp_setup_stream_res(fu, max_streams);
833
834 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
835 if (ret)
836 goto err_free_stream;
837
838 return 0;
839
840err_free_stream:
841 uasp_free_cmdreq(fu);
842
843err_cleanup:
844 if (i) {
845 do {
846 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
847 i--;
848 } while (i);
849 }
850 pr_err("UASP: endpoint setup failed\n");
851 return ret;
852}
853
854static void uasp_set_alt(struct f_uas *fu)
855{
856 struct usb_function *f = &fu->function;
857 struct usb_gadget *gadget = f->config->cdev->gadget;
858 int ret;
859
860 fu->flags = USBG_IS_UAS;
861
862 if (gadget->speed == USB_SPEED_SUPER)
863 fu->flags |= USBG_USE_STREAMS;
864
865 config_ep_by_speed(gadget, f, fu->ep_in);
866 ret = usb_ep_enable(fu->ep_in);
867 if (ret)
868 goto err_b_in;
869
870 config_ep_by_speed(gadget, f, fu->ep_out);
871 ret = usb_ep_enable(fu->ep_out);
872 if (ret)
873 goto err_b_out;
874
875 config_ep_by_speed(gadget, f, fu->ep_cmd);
876 ret = usb_ep_enable(fu->ep_cmd);
877 if (ret)
878 goto err_cmd;
879 config_ep_by_speed(gadget, f, fu->ep_status);
880 ret = usb_ep_enable(fu->ep_status);
881 if (ret)
882 goto err_status;
883
884 ret = uasp_prepare_reqs(fu);
885 if (ret)
886 goto err_wq;
887 fu->flags |= USBG_ENABLED;
888
889 pr_info("Using the UAS protocol\n");
890 return;
891err_wq:
892 usb_ep_disable(fu->ep_status);
893err_status:
894 usb_ep_disable(fu->ep_cmd);
895err_cmd:
896 usb_ep_disable(fu->ep_out);
897err_b_out:
898 usb_ep_disable(fu->ep_in);
899err_b_in:
900 fu->flags = 0;
901}
902
903static int get_cmd_dir(const unsigned char *cdb)
904{
905 int ret;
906
907 switch (cdb[0]) {
908 case READ_6:
909 case READ_10:
910 case READ_12:
911 case READ_16:
912 case INQUIRY:
913 case MODE_SENSE:
914 case MODE_SENSE_10:
915 case SERVICE_ACTION_IN:
916 case MAINTENANCE_IN:
917 case PERSISTENT_RESERVE_IN:
918 case SECURITY_PROTOCOL_IN:
919 case ACCESS_CONTROL_IN:
920 case REPORT_LUNS:
921 case READ_BLOCK_LIMITS:
922 case READ_POSITION:
923 case READ_CAPACITY:
924 case READ_TOC:
925 case READ_FORMAT_CAPACITIES:
926 case REQUEST_SENSE:
927 ret = DMA_FROM_DEVICE;
928 break;
929
930 case WRITE_6:
931 case WRITE_10:
932 case WRITE_12:
933 case WRITE_16:
934 case MODE_SELECT:
935 case MODE_SELECT_10:
936 case WRITE_VERIFY:
937 case WRITE_VERIFY_12:
938 case PERSISTENT_RESERVE_OUT:
939 case MAINTENANCE_OUT:
940 case SECURITY_PROTOCOL_OUT:
941 case ACCESS_CONTROL_OUT:
942 ret = DMA_TO_DEVICE;
943 break;
944 case ALLOW_MEDIUM_REMOVAL:
945 case TEST_UNIT_READY:
946 case SYNCHRONIZE_CACHE:
947 case START_STOP:
948 case ERASE:
949 case REZERO_UNIT:
950 case SEEK_10:
951 case SPACE:
952 case VERIFY:
953 case WRITE_FILEMARKS:
954 ret = DMA_NONE;
955 break;
956 default:
957 pr_warn("target: Unknown data direction for SCSI Opcode "
958 "0x%02x\n", cdb[0]);
959 ret = -EINVAL;
960 }
961 return ret;
962}
963
964static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
965{
966 struct usbg_cmd *cmd = req->context;
967 struct se_cmd *se_cmd = &cmd->se_cmd;
968
969 if (req->status < 0) {
970 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
971 goto cleanup;
972 }
973
974 if (req->num_sgs == 0) {
975 sg_copy_from_buffer(se_cmd->t_data_sg,
976 se_cmd->t_data_nents,
977 cmd->data_buf,
978 se_cmd->data_length);
979 }
980
981 complete(&cmd->write_complete);
982 return;
983
984cleanup:
985 usbg_cleanup_cmd(cmd);
986}
987
988static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
989{
990 struct se_cmd *se_cmd = &cmd->se_cmd;
991 struct f_uas *fu = cmd->fu;
992 struct usb_gadget *gadget = fuas_to_gadget(fu);
993
994 if (!gadget->sg_supported) {
995 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
996 if (!cmd->data_buf)
997 return -ENOMEM;
998
999 req->buf = cmd->data_buf;
1000 } else {
1001 req->buf = NULL;
1002 req->num_sgs = se_cmd->t_data_nents;
1003 req->sg = se_cmd->t_data_sg;
1004 }
1005
1006 req->complete = usbg_data_write_cmpl;
1007 req->length = se_cmd->data_length;
1008 req->context = cmd;
1009 return 0;
1010}
1011
1012static int usbg_send_status_response(struct se_cmd *se_cmd)
1013{
1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015 se_cmd);
1016 struct f_uas *fu = cmd->fu;
1017
1018 if (fu->flags & USBG_IS_BOT)
1019 return bot_send_status_response(cmd);
1020 else
1021 return uasp_send_status_response(cmd);
1022}
1023
1024static int usbg_send_write_request(struct se_cmd *se_cmd)
1025{
1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027 se_cmd);
1028 struct f_uas *fu = cmd->fu;
1029
1030 if (fu->flags & USBG_IS_BOT)
1031 return bot_send_write_request(cmd);
1032 else
1033 return uasp_send_write_request(cmd);
1034}
1035
1036static int usbg_send_read_response(struct se_cmd *se_cmd)
1037{
1038 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1039 se_cmd);
1040 struct f_uas *fu = cmd->fu;
1041
1042 if (fu->flags & USBG_IS_BOT)
1043 return bot_send_read_response(cmd);
1044 else
1045 return uasp_send_read_response(cmd);
1046}
1047
1048static void usbg_cmd_work(struct work_struct *work)
1049{
1050 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1051 struct se_cmd *se_cmd;
1052 struct tcm_usbg_nexus *tv_nexus;
1053 struct usbg_tpg *tpg;
1054 int dir;
1055
1056 se_cmd = &cmd->se_cmd;
1057 tpg = cmd->fu->tpg;
1058 tv_nexus = tpg->tpg_nexus;
1059 dir = get_cmd_dir(cmd->cmd_buf);
1060 if (dir < 0) {
1061 transport_init_se_cmd(se_cmd,
1062 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1063 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1064 cmd->prio_attr, cmd->sense_iu.sense);
d6dfc868 1065 goto out;
c52661d6
SAS		 1066 }
1067
d6dfc868 1068 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
c52661d6 1069 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
d6dfc868
RD		 1070 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1071 goto out;
1072
1073 return;
1074
1075out:
1076 transport_send_check_condition_and_sense(se_cmd,
1077 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1078 usbg_cleanup_cmd(cmd);
c52661d6
SAS		 1079}
1080
1081static int usbg_submit_command(struct f_uas *fu,
1082 void *cmdbuf, unsigned int len)
1083{
1084 struct command_iu *cmd_iu = cmdbuf;
1085 struct usbg_cmd *cmd;
1086 struct usbg_tpg *tpg;
1087 struct se_cmd *se_cmd;
1088 struct tcm_usbg_nexus *tv_nexus;
1089 u32 cmd_len;
1090 int ret;
1091
1092 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1093 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1094 return -EINVAL;
1095 }
1096
1097 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1098 if (!cmd)
1099 return -ENOMEM;
1100
1101 cmd->fu = fu;
1102
1103 /* XXX until I figure out why I can't free in on complete */
1104 kref_init(&cmd->ref);
1105 kref_get(&cmd->ref);
1106
1107 tpg = fu->tpg;
1108 cmd_len = (cmd_iu->len & ~0x3) + 16;
1109 if (cmd_len > USBG_MAX_CMD)
1110 goto err;
1111
1112 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1113
1114 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1115 if (fu->flags & USBG_USE_STREAMS) {
1116 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1117 goto err;
1118 if (!cmd->tag)
1119 cmd->stream = &fu->stream[0];
1120 else
1121 cmd->stream = &fu->stream[cmd->tag - 1];
1122 } else {
1123 cmd->stream = &fu->stream[0];
1124 }
1125
1126 tv_nexus = tpg->tpg_nexus;
1127 if (!tv_nexus) {
1128 pr_err("Missing nexus, ignoring command\n");
1129 goto err;
1130 }
1131
1132 switch (cmd_iu->prio_attr & 0x7) {
1133 case UAS_HEAD_TAG:
1134 cmd->prio_attr = MSG_HEAD_TAG;
1135 break;
1136 case UAS_ORDERED_TAG:
1137 cmd->prio_attr = MSG_ORDERED_TAG;
1138 break;
1139 case UAS_ACA:
1140 cmd->prio_attr = MSG_ACA_TAG;
1141 break;
1142 default:
1143 pr_debug_once("Unsupported prio_attr: %02x.\n",
1144 cmd_iu->prio_attr);
1145 case UAS_SIMPLE_TAG:
1146 cmd->prio_attr = MSG_SIMPLE_TAG;
1147 break;
1148 }
1149
1150 se_cmd = &cmd->se_cmd;
1151 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1152
1153 INIT_WORK(&cmd->work, usbg_cmd_work);
1154 ret = queue_work(tpg->workqueue, &cmd->work);
1155 if (ret < 0)
1156 goto err;
1157
1158 return 0;
1159err:
1160 kfree(cmd);
1161 return -EINVAL;
1162}
1163
1164static void bot_cmd_work(struct work_struct *work)
1165{
1166 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167 struct se_cmd *se_cmd;
1168 struct tcm_usbg_nexus *tv_nexus;
1169 struct usbg_tpg *tpg;
1170 int dir;
1171
1172 se_cmd = &cmd->se_cmd;
1173 tpg = cmd->fu->tpg;
1174 tv_nexus = tpg->tpg_nexus;
1175 dir = get_cmd_dir(cmd->cmd_buf);
1176 if (dir < 0) {
1177 transport_init_se_cmd(se_cmd,
1178 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180 cmd->prio_attr, cmd->sense_iu.sense);
d6dfc868 1181 goto out;
c52661d6
SAS		 1182 }
1183
d6dfc868 1184 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
c52661d6 1185 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
d6dfc868
RD		 1186 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187 goto out;
1188
1189 return;
1190
1191out:
1192 transport_send_check_condition_and_sense(se_cmd,
1193 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194 usbg_cleanup_cmd(cmd);
c52661d6
SAS		 1195}
1196
1197static int bot_submit_command(struct f_uas *fu,
1198 void *cmdbuf, unsigned int len)
1199{
1200 struct bulk_cb_wrap *cbw = cmdbuf;
1201 struct usbg_cmd *cmd;
1202 struct usbg_tpg *tpg;
1203 struct se_cmd *se_cmd;
1204 struct tcm_usbg_nexus *tv_nexus;
1205 u32 cmd_len;
1206 int ret;
1207
1208 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1209 pr_err("Wrong signature on CBW\n");
1210 return -EINVAL;
1211 }
1212 if (len != 31) {
1213 pr_err("Wrong length for CBW\n");
1214 return -EINVAL;
1215 }
1216
1217 cmd_len = cbw->Length;
1218 if (cmd_len < 1 || cmd_len > 16)
1219 return -EINVAL;
1220
1221 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1222 if (!cmd)
1223 return -ENOMEM;
1224
1225 cmd->fu = fu;
1226
1227 /* XXX until I figure out why I can't free in on complete */
1228 kref_init(&cmd->ref);
1229 kref_get(&cmd->ref);
1230
1231 tpg = fu->tpg;
1232
1233 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1234
1235 cmd->bot_tag = cbw->Tag;
1236
1237 tv_nexus = tpg->tpg_nexus;
1238 if (!tv_nexus) {
1239 pr_err("Missing nexus, ignoring command\n");
1240 goto err;
1241 }
1242
1243 cmd->prio_attr = MSG_SIMPLE_TAG;
1244 se_cmd = &cmd->se_cmd;
1245 cmd->unpacked_lun = cbw->Lun;
1246 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1247 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1248
1249 INIT_WORK(&cmd->work, bot_cmd_work);
1250 ret = queue_work(tpg->workqueue, &cmd->work);
1251 if (ret < 0)
1252 goto err;
1253
1254 return 0;
1255err:
1256 kfree(cmd);
1257 return -EINVAL;
1258}
1259
1260/* Start fabric.c code */
1261
1262static int usbg_check_true(struct se_portal_group *se_tpg)
1263{
1264 return 1;
1265}
1266
1267static int usbg_check_false(struct se_portal_group *se_tpg)
1268{
1269 return 0;
1270}
1271
1272static char *usbg_get_fabric_name(void)
1273{
1274 return "usb_gadget";
1275}
1276
1277static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1278{
1279 struct usbg_tpg *tpg = container_of(se_tpg,
1280 struct usbg_tpg, se_tpg);
1281 struct usbg_tport *tport = tpg->tport;
1282 u8 proto_id;
1283
1284 switch (tport->tport_proto_id) {
1285 case SCSI_PROTOCOL_SAS:
1286 default:
1287 proto_id = sas_get_fabric_proto_ident(se_tpg);
1288 break;
1289 }
1290
1291 return proto_id;
1292}
1293
1294static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1295{
1296 struct usbg_tpg *tpg = container_of(se_tpg,
1297 struct usbg_tpg, se_tpg);
1298 struct usbg_tport *tport = tpg->tport;
1299
1300 return &tport->tport_name[0];
1301}
1302
1303static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1304{
1305 struct usbg_tpg *tpg = container_of(se_tpg,
1306 struct usbg_tpg, se_tpg);
1307 return tpg->tport_tpgt;
1308}
1309
1310static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1311{
1312 return 1;
1313}
1314
1315static u32 usbg_get_pr_transport_id(
1316 struct se_portal_group *se_tpg,
1317 struct se_node_acl *se_nacl,
1318 struct t10_pr_registration *pr_reg,
1319 int *format_code,
1320 unsigned char *buf)
1321{
1322 struct usbg_tpg *tpg = container_of(se_tpg,
1323 struct usbg_tpg, se_tpg);
1324 struct usbg_tport *tport = tpg->tport;
1325 int ret = 0;
1326
1327 switch (tport->tport_proto_id) {
1328 case SCSI_PROTOCOL_SAS:
1329 default:
1330 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1331 format_code, buf);
1332 break;
1333 }
1334
1335 return ret;
1336}
1337
1338static u32 usbg_get_pr_transport_id_len(
1339 struct se_portal_group *se_tpg,
1340 struct se_node_acl *se_nacl,
1341 struct t10_pr_registration *pr_reg,
1342 int *format_code)
1343{
1344 struct usbg_tpg *tpg = container_of(se_tpg,
1345 struct usbg_tpg, se_tpg);
1346 struct usbg_tport *tport = tpg->tport;
1347 int ret = 0;
1348
1349 switch (tport->tport_proto_id) {
1350 case SCSI_PROTOCOL_SAS:
1351 default:
1352 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1353 format_code);
1354 break;
1355 }
1356
1357 return ret;
1358}
1359
1360static char *usbg_parse_pr_out_transport_id(
1361 struct se_portal_group *se_tpg,
1362 const char *buf,
1363 u32 *out_tid_len,
1364 char **port_nexus_ptr)
1365{
1366 struct usbg_tpg *tpg = container_of(se_tpg,
1367 struct usbg_tpg, se_tpg);
1368 struct usbg_tport *tport = tpg->tport;
1369 char *tid = NULL;
1370
1371 switch (tport->tport_proto_id) {
1372 case SCSI_PROTOCOL_SAS:
1373 default:
1374 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375 port_nexus_ptr);
1376 }
1377
1378 return tid;
1379}
1380
1381static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1382{
1383 struct usbg_nacl *nacl;
1384
1385 nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
f06d186d 1386 if (!nacl)
c52661d6 1387 return NULL;
c52661d6
SAS		 1388
1389 return &nacl->se_node_acl;
1390}
1391
1392static void usbg_release_fabric_acl(
1393 struct se_portal_group *se_tpg,
1394 struct se_node_acl *se_nacl)
1395{
1396 struct usbg_nacl *nacl = container_of(se_nacl,
1397 struct usbg_nacl, se_node_acl);
1398 kfree(nacl);
1399}
1400
1401static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1402{
1403 return 1;
1404}
1405
c52661d6
SAS		 1406static void usbg_cmd_release(struct kref *ref)
1407{
1408 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1409 ref);
1410
1411 transport_generic_free_cmd(&cmd->se_cmd, 0);
1412}
1413
1414static void usbg_release_cmd(struct se_cmd *se_cmd)
1415{
1416 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1417 se_cmd);
1418 kfree(cmd->data_buf);
1419 kfree(cmd);
1420 return;
1421}
1422
1423static int usbg_shutdown_session(struct se_session *se_sess)
1424{
1425 return 0;
1426}
1427
1428static void usbg_close_session(struct se_session *se_sess)
1429{
1430 return;
1431}
1432
1433static u32 usbg_sess_get_index(struct se_session *se_sess)
1434{
1435 return 0;
1436}
1437
1438/*
1439 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1440 */
1441static int usbg_write_pending_status(struct se_cmd *se_cmd)
1442{
1443 return 0;
1444}
1445
1446static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1447{
1448 return;
1449}
1450
1451static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1452{
1453 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1454 se_cmd);
1455 struct f_uas *fu = cmd->fu;
1456
1457 if (fu->flags & USBG_IS_BOT)
1458 return le32_to_cpu(cmd->bot_tag);
1459 else
1460 return cmd->tag;
1461}
1462
1463static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1464{
1465 return 0;
1466}
1467
b79fafac 1468static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
c52661d6 1469{
c52661d6
SAS		 1470}
1471
131e6abc
NB		 1472static void usbg_aborted_task(struct se_cmd *se_cmd)
1473{
1474 return;
1475}
1476
c52661d6
SAS		 1477static const char *usbg_check_wwn(const char *name)
1478{
1479 const char *n;
1480 unsigned int len;
1481
1482 n = strstr(name, "naa.");
1483 if (!n)
1484 return NULL;
1485 n += 4;
1486 len = strlen(n);
1487 if (len == 0 || len > USBG_NAMELEN - 1)
1488 return NULL;
1489 return n;
1490}
1491
1492static struct se_node_acl *usbg_make_nodeacl(
1493 struct se_portal_group *se_tpg,
1494 struct config_group *group,
1495 const char *name)
1496{
1497 struct se_node_acl *se_nacl, *se_nacl_new;
1498 struct usbg_nacl *nacl;
1499 u64 wwpn = 0;
1500 u32 nexus_depth;
1501 const char *wnn_name;
1502
1503 wnn_name = usbg_check_wwn(name);
1504 if (!wnn_name)
1505 return ERR_PTR(-EINVAL);
1506 se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1507 if (!(se_nacl_new))
1508 return ERR_PTR(-ENOMEM);
1509
1510 nexus_depth = 1;
1511 /*
1512 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1513 * when converting a NodeACL from demo mode -> explict
1514 */
1515 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1516 name, nexus_depth);
1517 if (IS_ERR(se_nacl)) {
1518 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1519 return se_nacl;
1520 }
1521 /*
1522 * Locate our struct usbg_nacl and set the FC Nport WWPN
1523 */
1524 nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1525 nacl->iport_wwpn = wwpn;
1526 snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1527 return se_nacl;
1528}
1529
1530static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1531{
1532 struct usbg_nacl *nacl = container_of(se_acl,
1533 struct usbg_nacl, se_node_acl);
1534 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1535 kfree(nacl);
1536}
1537
1538struct usbg_tpg *the_only_tpg_I_currently_have;
1539
1540static struct se_portal_group *usbg_make_tpg(
1541 struct se_wwn *wwn,
1542 struct config_group *group,
1543 const char *name)
1544{
1545 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1546 tport_wwn);
1547 struct usbg_tpg *tpg;
1548 unsigned long tpgt;
1549 int ret;
1550
1551 if (strstr(name, "tpgt_") != name)
1552 return ERR_PTR(-EINVAL);
1553 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1554 return ERR_PTR(-EINVAL);
1555 if (the_only_tpg_I_currently_have) {
1556 pr_err("Until the gadget framework can't handle multiple\n");
1557 pr_err("gadgets, you can't do this here.\n");
1558 return ERR_PTR(-EBUSY);
1559 }
1560
1561 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
f06d186d 1562 if (!tpg)
c52661d6 1563 return ERR_PTR(-ENOMEM);
c52661d6
SAS		 1564 mutex_init(&tpg->tpg_mutex);
1565 atomic_set(&tpg->tpg_port_count, 0);
1566 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1567 if (!tpg->workqueue) {
1568 kfree(tpg);
1569 return NULL;
1570 }
1571
1572 tpg->tport = tport;
1573 tpg->tport_tpgt = tpgt;
1574
1575 ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1576 &tpg->se_tpg, tpg,
1577 TRANSPORT_TPG_TYPE_NORMAL);
1578 if (ret < 0) {
1579 destroy_workqueue(tpg->workqueue);
1580 kfree(tpg);
1581 return NULL;
1582 }
1583 the_only_tpg_I_currently_have = tpg;
1584 return &tpg->se_tpg;
1585}
1586
1587static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1588{
1589 struct usbg_tpg *tpg = container_of(se_tpg,
1590 struct usbg_tpg, se_tpg);
1591
1592 core_tpg_deregister(se_tpg);
1593 destroy_workqueue(tpg->workqueue);
1594 kfree(tpg);
1595 the_only_tpg_I_currently_have = NULL;
1596}
1597
1598static struct se_wwn *usbg_make_tport(
1599 struct target_fabric_configfs *tf,
1600 struct config_group *group,
1601 const char *name)
1602{
1603 struct usbg_tport *tport;
1604 const char *wnn_name;
1605 u64 wwpn = 0;
1606
1607 wnn_name = usbg_check_wwn(name);
1608 if (!wnn_name)
1609 return ERR_PTR(-EINVAL);
1610
1611 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
f06d186d 1612 if (!(tport))
c52661d6 1613 return ERR_PTR(-ENOMEM);
c52661d6 1614 tport->tport_wwpn = wwpn;
aba37fd9 1615 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
c52661d6
SAS		 1616 return &tport->tport_wwn;
1617}
1618
1619static void usbg_drop_tport(struct se_wwn *wwn)
1620{
1621 struct usbg_tport *tport = container_of(wwn,
1622 struct usbg_tport, tport_wwn);
1623 kfree(tport);
1624}
1625
1626/*
1627 * If somebody feels like dropping the version property, go ahead.
1628 */
1629static ssize_t usbg_wwn_show_attr_version(
1630 struct target_fabric_configfs *tf,
1631 char *page)
1632{
1633 return sprintf(page, "usb-gadget fabric module\n");
1634}
1635TF_WWN_ATTR_RO(usbg, version);
1636
1637static struct configfs_attribute *usbg_wwn_attrs[] = {
1638 &usbg_wwn_version.attr,
1639 NULL,
1640};
1641
1642static ssize_t tcm_usbg_tpg_show_enable(
1643 struct se_portal_group *se_tpg,
1644 char *page)
1645{
1646 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1647
1648 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1649}
1650
1651static int usbg_attach(struct usbg_tpg *);
1652static void usbg_detach(struct usbg_tpg *);
1653
1654static ssize_t tcm_usbg_tpg_store_enable(
1655 struct se_portal_group *se_tpg,
1656 const char *page,
1657 size_t count)
1658{
1659 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1660 unsigned long op;
1661 ssize_t ret;
1662
1663 ret = kstrtoul(page, 0, &op);
1664 if (ret < 0)
1665 return -EINVAL;
1666 if (op > 1)
1667 return -EINVAL;
1668
1669 if (op && tpg->gadget_connect)
1670 goto out;
1671 if (!op && !tpg->gadget_connect)
1672 goto out;
1673
1674 if (op) {
1675 ret = usbg_attach(tpg);
1676 if (ret)
1677 goto out;
1678 } else {
1679 usbg_detach(tpg);
1680 }
1681 tpg->gadget_connect = op;
1682out:
1683 return count;
1684}
1685TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1686
1687static ssize_t tcm_usbg_tpg_show_nexus(
1688 struct se_portal_group *se_tpg,
1689 char *page)
1690{
1691 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1692 struct tcm_usbg_nexus *tv_nexus;
1693 ssize_t ret;
1694
1695 mutex_lock(&tpg->tpg_mutex);
1696 tv_nexus = tpg->tpg_nexus;
1697 if (!tv_nexus) {
1698 ret = -ENODEV;
1699 goto out;
1700 }
1701 ret = snprintf(page, PAGE_SIZE, "%s\n",
1702 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1703out:
1704 mutex_unlock(&tpg->tpg_mutex);
1705 return ret;
1706}
1707
1708static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1709{
1710 struct se_portal_group *se_tpg;
1711 struct tcm_usbg_nexus *tv_nexus;
1712 int ret;
1713
1714 mutex_lock(&tpg->tpg_mutex);
1715 if (tpg->tpg_nexus) {
1716 ret = -EEXIST;
1717 pr_debug("tpg->tpg_nexus already exists\n");
1718 goto err_unlock;
1719 }
1720 se_tpg = &tpg->se_tpg;
1721
1722 ret = -ENOMEM;
1723 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
f06d186d 1724 if (!tv_nexus)
c52661d6 1725 goto err_unlock;
e70beee7 1726 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
c52661d6
SAS		 1727 if (IS_ERR(tv_nexus->tvn_se_sess))
1728 goto err_free;
1729
1730 /*
1731 * Since we are running in 'demo mode' this call with generate a
1732 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1733 * the SCSI Initiator port name of the passed configfs group 'name'.
1734 */
1735 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1736 se_tpg, name);
1737 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1738 pr_debug("core_tpg_check_initiator_node_acl() failed"
1739 " for %s\n", name);
1740 goto err_session;
1741 }
1742 /*
1743 * Now register the TCM vHost virtual I_T Nexus as active with the
1744 * call to __transport_register_session()
1745 */
1746 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1747 tv_nexus->tvn_se_sess, tv_nexus);
1748 tpg->tpg_nexus = tv_nexus;
1749 mutex_unlock(&tpg->tpg_mutex);
1750 return 0;
1751
1752err_session:
1753 transport_free_session(tv_nexus->tvn_se_sess);
1754err_free:
1755 kfree(tv_nexus);
1756err_unlock:
1757 mutex_unlock(&tpg->tpg_mutex);
1758 return ret;
1759}
1760
1761static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1762{
1763 struct se_session *se_sess;
1764 struct tcm_usbg_nexus *tv_nexus;
1765 int ret = -ENODEV;
1766
1767 mutex_lock(&tpg->tpg_mutex);
1768 tv_nexus = tpg->tpg_nexus;
1769 if (!tv_nexus)
1770 goto out;
1771
1772 se_sess = tv_nexus->tvn_se_sess;
1773 if (!se_sess)
1774 goto out;
1775
1776 if (atomic_read(&tpg->tpg_port_count)) {
1777 ret = -EPERM;
1778 pr_err("Unable to remove Host I_T Nexus with"
1779 " active TPG port count: %d\n",
1780 atomic_read(&tpg->tpg_port_count));
1781 goto out;
1782 }
1783
1784 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1785 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1786 /*
1787 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1788 */
1789 transport_deregister_session(tv_nexus->tvn_se_sess);
1790 tpg->tpg_nexus = NULL;
1791
1792 kfree(tv_nexus);
5dbd6935 1793 ret = 0;
c52661d6
SAS		 1794out:
1795 mutex_unlock(&tpg->tpg_mutex);
5dbd6935 1796 return ret;
c52661d6
SAS		 1797}
1798
1799static ssize_t tcm_usbg_tpg_store_nexus(
1800 struct se_portal_group *se_tpg,
1801 const char *page,
1802 size_t count)
1803{
1804 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1805 unsigned char i_port[USBG_NAMELEN], *ptr;
1806 int ret;
1807
1808 if (!strncmp(page, "NULL", 4)) {
1809 ret = tcm_usbg_drop_nexus(tpg);
1810 return (!ret) ? count : ret;
1811 }
232ebe34 1812 if (strlen(page) >= USBG_NAMELEN) {
c52661d6
SAS		 1813 pr_err("Emulated NAA Sas Address: %s, exceeds"
1814 " max: %d\n", page, USBG_NAMELEN);
1815 return -EINVAL;
1816 }
1817 snprintf(i_port, USBG_NAMELEN, "%s", page);
1818
1819 ptr = strstr(i_port, "naa.");
1820 if (!ptr) {
1821 pr_err("Missing 'naa.' prefix\n");
1822 return -EINVAL;
1823 }
1824
1825 if (i_port[strlen(i_port) - 1] == '\n')
1826 i_port[strlen(i_port) - 1] = '\0';
1827
1828 ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1829 if (ret < 0)
1830 return ret;
1831 return count;
1832}
1833TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1834
1835static struct configfs_attribute *usbg_base_attrs[] = {
1836 &tcm_usbg_tpg_enable.attr,
1837 &tcm_usbg_tpg_nexus.attr,
1838 NULL,
1839};
1840
1841static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1842{
1843 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1844
1845 atomic_inc(&tpg->tpg_port_count);
4e857c58 1846 smp_mb__after_atomic();
c52661d6
SAS		 1847 return 0;
1848}
1849
1850static void usbg_port_unlink(struct se_portal_group *se_tpg,
1851 struct se_lun *se_lun)
1852{
1853 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1854
1855 atomic_dec(&tpg->tpg_port_count);
4e857c58 1856 smp_mb__after_atomic();
c52661d6
SAS		 1857}
1858
1859static int usbg_check_stop_free(struct se_cmd *se_cmd)
1860{
1861 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1862 se_cmd);
1863
1864 kref_put(&cmd->ref, usbg_cmd_release);
1865 return 1;
1866}
1867
1868static struct target_core_fabric_ops usbg_ops = {
1869 .get_fabric_name = usbg_get_fabric_name,
1870 .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
1871 .tpg_get_wwn = usbg_get_fabric_wwn,
1872 .tpg_get_tag = usbg_get_tag,
1873 .tpg_get_default_depth = usbg_get_default_depth,
1874 .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
1875 .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
1876 .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
1877 .tpg_check_demo_mode = usbg_check_true,
1878 .tpg_check_demo_mode_cache = usbg_check_false,
1879 .tpg_check_demo_mode_write_protect = usbg_check_false,
1880 .tpg_check_prod_mode_write_protect = usbg_check_false,
1881 .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
1882 .tpg_release_fabric_acl = usbg_release_fabric_acl,
1883 .tpg_get_inst_index = usbg_tpg_get_inst_index,
c52661d6
SAS		 1884 .release_cmd = usbg_release_cmd,
1885 .shutdown_session = usbg_shutdown_session,
1886 .close_session = usbg_close_session,
1887 .sess_get_index = usbg_sess_get_index,
1888 .sess_get_initiator_sid = NULL,
1889 .write_pending = usbg_send_write_request,
1890 .write_pending_status = usbg_write_pending_status,
1891 .set_default_node_attributes = usbg_set_default_node_attrs,
1892 .get_task_tag = usbg_get_task_tag,
1893 .get_cmd_state = usbg_get_cmd_state,
1894 .queue_data_in = usbg_send_read_response,
1895 .queue_status = usbg_send_status_response,
1896 .queue_tm_rsp = usbg_queue_tm_rsp,
131e6abc 1897 .aborted_task = usbg_aborted_task,
c52661d6
SAS		 1898 .check_stop_free = usbg_check_stop_free,
1899
1900 .fabric_make_wwn = usbg_make_tport,
1901 .fabric_drop_wwn = usbg_drop_tport,
1902 .fabric_make_tpg = usbg_make_tpg,
1903 .fabric_drop_tpg = usbg_drop_tpg,
1904 .fabric_post_link = usbg_port_link,
1905 .fabric_pre_unlink = usbg_port_unlink,
1906 .fabric_make_np = NULL,
1907 .fabric_drop_np = NULL,
1908 .fabric_make_nodeacl = usbg_make_nodeacl,
1909 .fabric_drop_nodeacl = usbg_drop_nodeacl,
1910};
1911
1912static int usbg_register_configfs(void)
1913{
1914 struct target_fabric_configfs *fabric;
1915 int ret;
1916
1917 fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1918 if (IS_ERR(fabric)) {
1919 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1920 return PTR_ERR(fabric);
1921 }
1922
1923 fabric->tf_ops = usbg_ops;
d80e224d
AG		 1924 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1925 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1926 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1927 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1928 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1929 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1930 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1931 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1932 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
c52661d6
SAS		 1933 ret = target_fabric_configfs_register(fabric);
1934 if (ret < 0) {
1935 printk(KERN_ERR "target_fabric_configfs_register() failed"
1936 " for usb-gadget\n");
1937 return ret;
1938 }
1939 usbg_fabric_configfs = fabric;
1940 return 0;
1941};
1942
1943static void usbg_deregister_configfs(void)
1944{
1945 if (!(usbg_fabric_configfs))
1946 return;
1947
1948 target_fabric_configfs_deregister(usbg_fabric_configfs);
1949 usbg_fabric_configfs = NULL;
1950};
1951
1952/* Start gadget.c code */
1953
1954static struct usb_interface_descriptor bot_intf_desc = {
1955 .bLength = sizeof(bot_intf_desc),
1956 .bDescriptorType = USB_DT_INTERFACE,
c52661d6
SAS		 1957 .bNumEndpoints = 2,
1958 .bAlternateSetting = USB_G_ALT_INT_BBB,
1959 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1960 .bInterfaceSubClass = USB_SC_SCSI,
1961 .bInterfaceProtocol = USB_PR_BULK,
c52661d6
SAS		 1962};
1963
1964static struct usb_interface_descriptor uasp_intf_desc = {
1965 .bLength = sizeof(uasp_intf_desc),
1966 .bDescriptorType = USB_DT_INTERFACE,
1967 .bNumEndpoints = 4,
1968 .bAlternateSetting = USB_G_ALT_INT_UAS,
1969 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1970 .bInterfaceSubClass = USB_SC_SCSI,
1971 .bInterfaceProtocol = USB_PR_UAS,
c52661d6
SAS		 1972};
1973
1974static struct usb_endpoint_descriptor uasp_bi_desc = {
1975 .bLength = USB_DT_ENDPOINT_SIZE,
1976 .bDescriptorType = USB_DT_ENDPOINT,
1977 .bEndpointAddress = USB_DIR_IN,
1978 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1979 .wMaxPacketSize = cpu_to_le16(512),
1980};
1981
1982static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1983 .bLength = USB_DT_ENDPOINT_SIZE,
1984 .bDescriptorType = USB_DT_ENDPOINT,
1985 .bEndpointAddress = USB_DIR_IN,
1986 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1987};
1988
1989static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1990 .bLength = sizeof(uasp_bi_pipe_desc),
1991 .bDescriptorType = USB_DT_PIPE_USAGE,
1992 .bPipeID = DATA_IN_PIPE_ID,
1993};
1994
1995static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1996 .bLength = USB_DT_ENDPOINT_SIZE,
1997 .bDescriptorType = USB_DT_ENDPOINT,
1998 .bEndpointAddress = USB_DIR_IN,
1999 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2000 .wMaxPacketSize = cpu_to_le16(1024),
2001};
2002
2003static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2004 .bLength = sizeof(uasp_bi_ep_comp_desc),
2005 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2006 .bMaxBurst = 0,
2007 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2008 .wBytesPerInterval = 0,
2009};
2010
2011static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2012 .bLength = sizeof(bot_bi_ep_comp_desc),
2013 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2014 .bMaxBurst = 0,
2015};
2016
2017static struct usb_endpoint_descriptor uasp_bo_desc = {
2018 .bLength = USB_DT_ENDPOINT_SIZE,
2019 .bDescriptorType = USB_DT_ENDPOINT,
2020 .bEndpointAddress = USB_DIR_OUT,
2021 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2022 .wMaxPacketSize = cpu_to_le16(512),
2023};
2024
2025static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2026 .bLength = USB_DT_ENDPOINT_SIZE,
2027 .bDescriptorType = USB_DT_ENDPOINT,
2028 .bEndpointAddress = USB_DIR_OUT,
2029 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2030};
2031
2032static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2033 .bLength = sizeof(uasp_bo_pipe_desc),
2034 .bDescriptorType = USB_DT_PIPE_USAGE,
2035 .bPipeID = DATA_OUT_PIPE_ID,
2036};
2037
2038static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2039 .bLength = USB_DT_ENDPOINT_SIZE,
2040 .bDescriptorType = USB_DT_ENDPOINT,
2041 .bEndpointAddress = USB_DIR_OUT,
2042 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2043 .wMaxPacketSize = cpu_to_le16(0x400),
2044};
2045
2046static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2047 .bLength = sizeof(uasp_bo_ep_comp_desc),
2048 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2049 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2050};
2051
2052static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2053 .bLength = sizeof(bot_bo_ep_comp_desc),
2054 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2055};
2056
2057static struct usb_endpoint_descriptor uasp_status_desc = {
2058 .bLength = USB_DT_ENDPOINT_SIZE,
2059 .bDescriptorType = USB_DT_ENDPOINT,
2060 .bEndpointAddress = USB_DIR_IN,
2061 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2062 .wMaxPacketSize = cpu_to_le16(512),
2063};
2064
2065static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2066 .bLength = USB_DT_ENDPOINT_SIZE,
2067 .bDescriptorType = USB_DT_ENDPOINT,
2068 .bEndpointAddress = USB_DIR_IN,
2069 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2070};
2071
2072static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2073 .bLength = sizeof(uasp_status_pipe_desc),
2074 .bDescriptorType = USB_DT_PIPE_USAGE,
2075 .bPipeID = STATUS_PIPE_ID,
2076};
2077
2078static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2079 .bLength = USB_DT_ENDPOINT_SIZE,
2080 .bDescriptorType = USB_DT_ENDPOINT,
2081 .bEndpointAddress = USB_DIR_IN,
2082 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2083 .wMaxPacketSize = cpu_to_le16(1024),
2084};
2085
2086static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2087 .bLength = sizeof(uasp_status_in_ep_comp_desc),
2088 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2089 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2090};
2091
2092static struct usb_endpoint_descriptor uasp_cmd_desc = {
2093 .bLength = USB_DT_ENDPOINT_SIZE,
2094 .bDescriptorType = USB_DT_ENDPOINT,
2095 .bEndpointAddress = USB_DIR_OUT,
2096 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2097 .wMaxPacketSize = cpu_to_le16(512),
2098};
2099
2100static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2101 .bLength = USB_DT_ENDPOINT_SIZE,
2102 .bDescriptorType = USB_DT_ENDPOINT,
2103 .bEndpointAddress = USB_DIR_OUT,
2104 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2105};
2106
2107static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2108 .bLength = sizeof(uasp_cmd_pipe_desc),
2109 .bDescriptorType = USB_DT_PIPE_USAGE,
2110 .bPipeID = CMD_PIPE_ID,
2111};
2112
2113static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2114 .bLength = USB_DT_ENDPOINT_SIZE,
2115 .bDescriptorType = USB_DT_ENDPOINT,
2116 .bEndpointAddress = USB_DIR_OUT,
2117 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2118 .wMaxPacketSize = cpu_to_le16(1024),
2119};
2120
2121static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2122 .bLength = sizeof(uasp_cmd_comp_desc),
2123 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2124};
2125
2126static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2127 (struct usb_descriptor_header *) &bot_intf_desc,
2128 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2129 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2130
2131 (struct usb_descriptor_header *) &uasp_intf_desc,
2132 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2133 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2134 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2135 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2136 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2137 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2138 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2139 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
fad8deb2 2140 NULL,
c52661d6
SAS		 2141};
2142
2143static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2144 (struct usb_descriptor_header *) &bot_intf_desc,
2145 (struct usb_descriptor_header *) &uasp_bi_desc,
2146 (struct usb_descriptor_header *) &uasp_bo_desc,
2147
2148 (struct usb_descriptor_header *) &uasp_intf_desc,
2149 (struct usb_descriptor_header *) &uasp_bi_desc,
2150 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2151 (struct usb_descriptor_header *) &uasp_bo_desc,
2152 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2153 (struct usb_descriptor_header *) &uasp_status_desc,
2154 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2155 (struct usb_descriptor_header *) &uasp_cmd_desc,
2156 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2157 NULL,
2158};
2159
2160static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2161 (struct usb_descriptor_header *) &bot_intf_desc,
2162 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2163 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2164 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2165 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2166
2167 (struct usb_descriptor_header *) &uasp_intf_desc,
2168 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2169 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2170 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2171 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2172 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2173 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2174 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2175 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2176 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2177 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2178 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2179 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2180 NULL,
2181};
2182
2183#define UAS_VENDOR_ID 0x0525 /* NetChip */
2184#define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
2185
2186static struct usb_device_descriptor usbg_device_desc = {
2187 .bLength = sizeof(usbg_device_desc),
2188 .bDescriptorType = USB_DT_DEVICE,
2189 .bcdUSB = cpu_to_le16(0x0200),
2190 .bDeviceClass = USB_CLASS_PER_INTERFACE,
2191 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
2192 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
c52661d6
SAS		 2193 .bNumConfigurations = 1,
2194};
2195
2196static struct usb_string usbg_us_strings[] = {
276e2e4f
SAS		 2197 [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2198 [USB_GADGET_PRODUCT_IDX].s = "Target Product",
2199 [USB_GADGET_SERIAL_IDX].s = "000000000001",
18786da4
SAS		 2200 [USB_G_STR_CONFIG].s = "default config",
2201 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
2202 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
c52661d6
SAS		 2203 { },
2204};
2205
2206static struct usb_gadget_strings usbg_stringtab = {
2207 .language = 0x0409,
2208 .strings = usbg_us_strings,
2209};
2210
2211static struct usb_gadget_strings *usbg_strings[] = {
2212 &usbg_stringtab,
2213 NULL,
2214};
2215
2216static int guas_unbind(struct usb_composite_dev *cdev)
2217{
2218 return 0;
2219}
2220
2221static struct usb_configuration usbg_config_driver = {
2222 .label = "Linux Target",
2223 .bConfigurationValue = 1,
c52661d6
SAS		 2224 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2225};
2226
2227static void give_back_ep(struct usb_ep **pep)
2228{
2229 struct usb_ep *ep = *pep;
2230 if (!ep)
2231 return;
2232 ep->driver_data = NULL;
2233}
2234
2235static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2236{
2237 struct f_uas *fu = to_f_uas(f);
2238 struct usb_gadget *gadget = c->cdev->gadget;
2239 struct usb_ep *ep;
2240 int iface;
10287bae 2241 int ret;
c52661d6
SAS		 2242
2243 iface = usb_interface_id(c, f);
2244 if (iface < 0)
2245 return iface;
2246
2247 bot_intf_desc.bInterfaceNumber = iface;
2248 uasp_intf_desc.bInterfaceNumber = iface;
2249 fu->iface = iface;
2250 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2251 &uasp_bi_ep_comp_desc);
2252 if (!ep)
2253 goto ep_fail;
2254
2255 ep->driver_data = fu;
2256 fu->ep_in = ep;
2257
2258 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2259 &uasp_bo_ep_comp_desc);
2260 if (!ep)
2261 goto ep_fail;
2262 ep->driver_data = fu;
2263 fu->ep_out = ep;
2264
2265 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2266 &uasp_status_in_ep_comp_desc);
2267 if (!ep)
2268 goto ep_fail;
2269 ep->driver_data = fu;
2270 fu->ep_status = ep;
2271
2272 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2273 &uasp_cmd_comp_desc);
2274 if (!ep)
2275 goto ep_fail;
2276 ep->driver_data = fu;
2277 fu->ep_cmd = ep;
2278
2279 /* Assume endpoint addresses are the same for both speeds */
2280 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2281 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2282 uasp_status_desc.bEndpointAddress =
2283 uasp_ss_status_desc.bEndpointAddress;
2284 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2285
2286 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2287 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2288 uasp_fs_status_desc.bEndpointAddress =
2289 uasp_ss_status_desc.bEndpointAddress;
2290 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2291
10287bae
SAS		 2292 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2293 uasp_hs_function_desc, uasp_ss_function_desc);
2294 if (ret)
2295 goto ep_fail;
2296
c52661d6
SAS		 2297 return 0;
2298ep_fail:
2299 pr_err("Can't claim all required eps\n");
2300
2301 give_back_ep(&fu->ep_in);
2302 give_back_ep(&fu->ep_out);
2303 give_back_ep(&fu->ep_status);
2304 give_back_ep(&fu->ep_cmd);
2305 return -ENOTSUPP;
2306}
2307
2308static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2309{
2310 struct f_uas *fu = to_f_uas(f);
2311
10287bae 2312 usb_free_all_descriptors(f);
c52661d6
SAS		 2313 kfree(fu);
2314}
2315
2316struct guas_setup_wq {
2317 struct work_struct work;
2318 struct f_uas *fu;
2319 unsigned int alt;
2320};
2321
2322static void usbg_delayed_set_alt(struct work_struct *wq)
2323{
2324 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2325 work);
2326 struct f_uas *fu = work->fu;
2327 int alt = work->alt;
2328
2329 kfree(work);
2330
2331 if (fu->flags & USBG_IS_BOT)
2332 bot_cleanup_old_alt(fu);
2333 if (fu->flags & USBG_IS_UAS)
2334 uasp_cleanup_old_alt(fu);
2335
2336 if (alt == USB_G_ALT_INT_BBB)
2337 bot_set_alt(fu);
2338 else if (alt == USB_G_ALT_INT_UAS)
2339 uasp_set_alt(fu);
2340 usb_composite_setup_continue(fu->function.config->cdev);
2341}
2342
2343static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2344{
2345 struct f_uas *fu = to_f_uas(f);
2346
2347 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2348 struct guas_setup_wq *work;
2349
2350 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2351 if (!work)
2352 return -ENOMEM;
2353 INIT_WORK(&work->work, usbg_delayed_set_alt);
2354 work->fu = fu;
2355 work->alt = alt;
2356 schedule_work(&work->work);
2357 return USB_GADGET_DELAYED_STATUS;
2358 }
2359 return -EOPNOTSUPP;
2360}
2361
2362static void usbg_disable(struct usb_function *f)
2363{
2364 struct f_uas *fu = to_f_uas(f);
2365
2366 if (fu->flags & USBG_IS_UAS)
2367 uasp_cleanup_old_alt(fu);
2368 else if (fu->flags & USBG_IS_BOT)
2369 bot_cleanup_old_alt(fu);
2370 fu->flags = 0;
2371}
2372
2373static int usbg_setup(struct usb_function *f,
2374 const struct usb_ctrlrequest *ctrl)
2375{
2376 struct f_uas *fu = to_f_uas(f);
2377
2378 if (!(fu->flags & USBG_IS_BOT))
2379 return -EOPNOTSUPP;
2380
2381 return usbg_bot_setup(f, ctrl);
2382}
2383
2384static int usbg_cfg_bind(struct usb_configuration *c)
2385{
2386 struct f_uas *fu;
2387 int ret;
2388
2389 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2390 if (!fu)
2391 return -ENOMEM;
2392 fu->function.name = "Target Function";
c52661d6
SAS		 2393 fu->function.bind = usbg_bind;
2394 fu->function.unbind = usbg_unbind;
2395 fu->function.set_alt = usbg_set_alt;
2396 fu->function.setup = usbg_setup;
2397 fu->function.disable = usbg_disable;
2398 fu->tpg = the_only_tpg_I_currently_have;
2399
18786da4
SAS		 2400 bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2401 uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2402
c52661d6
SAS		 2403 ret = usb_add_function(c, &fu->function);
2404 if (ret)
2405 goto err;
2406
2407 return 0;
2408err:
2409 kfree(fu);
2410 return ret;
2411}
2412
2413static int usb_target_bind(struct usb_composite_dev *cdev)
2414{
2415 int ret;
2416
18786da4
SAS		 2417 ret = usb_string_ids_tab(cdev, usbg_us_strings);
2418 if (ret)
2419 return ret;
2420
2421 usbg_device_desc.iManufacturer =
276e2e4f
SAS		 2422 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2423 usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2424 usbg_device_desc.iSerialNumber =
2425 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
18786da4
SAS		 2426 usbg_config_driver.iConfiguration =
2427 usbg_us_strings[USB_G_STR_CONFIG].id;
2428
c52661d6
SAS		 2429 ret = usb_add_config(cdev, &usbg_config_driver,
2430 usbg_cfg_bind);
7d16e8d3
SAS		 2431 if (ret)
2432 return ret;
2433 usb_composite_overwrite_options(cdev, &coverwrite);
c52661d6
SAS		 2434 return 0;
2435}
2436
c2ec75c2 2437static __refdata struct usb_composite_driver usbg_driver = {
c52661d6
SAS		 2438 .name = "g_target",
2439 .dev = &usbg_device_desc,
2440 .strings = usbg_strings,
2441 .max_speed = USB_SPEED_SUPER,
03e42bd5 2442 .bind = usb_target_bind,
c52661d6
SAS		 2443 .unbind = guas_unbind,
2444};
2445
2446static int usbg_attach(struct usbg_tpg *tpg)
2447{
03e42bd5 2448 return usb_composite_probe(&usbg_driver);
c52661d6
SAS		 2449}
2450
2451static void usbg_detach(struct usbg_tpg *tpg)
2452{
2453 usb_composite_unregister(&usbg_driver);
2454}
2455
2456static int __init usb_target_gadget_init(void)
2457{
2458 int ret;
2459
2460 ret = usbg_register_configfs();
2461 return ret;
2462}
2463module_init(usb_target_gadget_init);
2464
2465static void __exit usb_target_gadget_exit(void)
2466{
2467 usbg_deregister_configfs();
2468}
2469module_exit(usb_target_gadget_exit);
2470
2471MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2472MODULE_DESCRIPTION("usb-gadget fabric");
2473MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)