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usb: gadget: tcm: convert to use new function registration interface
[deliverable/linux.git] / drivers / usb / gadget / function / f_tcm.c
CommitLineData
08a1cb0f
AP		 1/* Target based USB-Gadget
2 *
3 * UAS protocol handling, target callbacks, configfs handling,
4 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
5 *
6 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
7 * License: GPLv2 as published by FSF.
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/string.h>
13#include <linux/configfs.h>
14#include <linux/ctype.h>
15#include <linux/usb/ch9.h>
16#include <linux/usb/composite.h>
17#include <linux/usb/gadget.h>
18#include <linux/usb/storage.h>
19#include <scsi/scsi_tcq.h>
20#include <target/target_core_base.h>
21#include <target/target_core_fabric.h>
22#include <asm/unaligned.h>
23
24#include "tcm.h"
dc8c46a5
AP		 25#include "u_tcm.h"
26
27#ifndef USBF_TCM_INCLUDED
28
29#define TPG_INSTANCES 1
30
31struct tpg_instance {
32 struct usb_function_instance *func_inst;
33 struct usbg_tpg *tpg;
34};
35
36static struct tpg_instance tpg_instances[TPG_INSTANCES];
37
38static DEFINE_MUTEX(tpg_instances_lock);
39#endif
08a1cb0f
AP		 40
41static inline struct f_uas *to_f_uas(struct usb_function *f)
42{
43 return container_of(f, struct f_uas, function);
44}
45
46static void usbg_cmd_release(struct kref *);
47
48static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
49{
50 kref_put(&cmd->ref, usbg_cmd_release);
51}
52
53/* Start bot.c code */
54
55static int bot_enqueue_cmd_cbw(struct f_uas *fu)
56{
57 int ret;
58
59 if (fu->flags & USBG_BOT_CMD_PEND)
60 return 0;
61
62 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
63 if (!ret)
64 fu->flags |= USBG_BOT_CMD_PEND;
65 return ret;
66}
67
68static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
69{
70 struct usbg_cmd *cmd = req->context;
71 struct f_uas *fu = cmd->fu;
72
73 usbg_cleanup_cmd(cmd);
74 if (req->status < 0) {
75 pr_err("ERR %s(%d)\n", __func__, __LINE__);
76 return;
77 }
78
79 /* CSW completed, wait for next CBW */
80 bot_enqueue_cmd_cbw(fu);
81}
82
83static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
84{
85 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
86 int ret;
87 u8 *sense;
88 unsigned int csw_stat;
89
90 csw_stat = cmd->csw_code;
91
92 /*
93 * We can't send SENSE as a response. So we take ASC & ASCQ from our
94 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
95 * command where it learns why we failed.
96 */
97 sense = cmd->sense_iu.sense;
98
99 csw->Tag = cmd->bot_tag;
100 csw->Status = csw_stat;
101 fu->bot_status.req->context = cmd;
102 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
103 if (ret)
104 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
105}
106
107static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
108{
109 struct usbg_cmd *cmd = req->context;
110 struct f_uas *fu = cmd->fu;
111
112 if (req->status < 0)
113 pr_err("ERR %s(%d)\n", __func__, __LINE__);
114
115 if (cmd->data_len) {
116 if (cmd->data_len > ep->maxpacket) {
117 req->length = ep->maxpacket;
118 cmd->data_len -= ep->maxpacket;
119 } else {
120 req->length = cmd->data_len;
121 cmd->data_len = 0;
122 }
123
124 usb_ep_queue(ep, req, GFP_ATOMIC);
125 return;
126 }
127 bot_enqueue_sense_code(fu, cmd);
128}
129
130static void bot_send_bad_status(struct usbg_cmd *cmd)
131{
132 struct f_uas *fu = cmd->fu;
133 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
134 struct usb_request *req;
135 struct usb_ep *ep;
136
137 csw->Residue = cpu_to_le32(cmd->data_len);
138
139 if (cmd->data_len) {
140 if (cmd->is_read) {
141 ep = fu->ep_in;
142 req = fu->bot_req_in;
143 } else {
144 ep = fu->ep_out;
145 req = fu->bot_req_out;
146 }
147
148 if (cmd->data_len > fu->ep_in->maxpacket) {
149 req->length = ep->maxpacket;
150 cmd->data_len -= ep->maxpacket;
151 } else {
152 req->length = cmd->data_len;
153 cmd->data_len = 0;
154 }
155 req->complete = bot_err_compl;
156 req->context = cmd;
157 req->buf = fu->cmd.buf;
158 usb_ep_queue(ep, req, GFP_KERNEL);
159 } else {
160 bot_enqueue_sense_code(fu, cmd);
161 }
162}
163
164static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
165{
166 struct f_uas *fu = cmd->fu;
167 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
168 int ret;
169
170 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
171 if (!moved_data && cmd->data_len) {
172 /*
173 * the host wants to move data, we don't. Fill / empty
174 * the pipe and then send the csw with reside set.
175 */
176 cmd->csw_code = US_BULK_STAT_OK;
177 bot_send_bad_status(cmd);
178 return 0;
179 }
180
181 csw->Tag = cmd->bot_tag;
182 csw->Residue = cpu_to_le32(0);
183 csw->Status = US_BULK_STAT_OK;
184 fu->bot_status.req->context = cmd;
185
186 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
187 if (ret)
188 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
189 } else {
190 cmd->csw_code = US_BULK_STAT_FAIL;
191 bot_send_bad_status(cmd);
192 }
193 return 0;
194}
195
196/*
197 * Called after command (no data transfer) or after the write (to device)
198 * operation is completed
199 */
200static int bot_send_status_response(struct usbg_cmd *cmd)
201{
202 bool moved_data = false;
203
204 if (!cmd->is_read)
205 moved_data = true;
206 return bot_send_status(cmd, moved_data);
207}
208
209/* Read request completed, now we have to send the CSW */
210static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
211{
212 struct usbg_cmd *cmd = req->context;
213
214 if (req->status < 0)
215 pr_err("ERR %s(%d)\n", __func__, __LINE__);
216
217 bot_send_status(cmd, true);
218}
219
220static int bot_send_read_response(struct usbg_cmd *cmd)
221{
222 struct f_uas *fu = cmd->fu;
223 struct se_cmd *se_cmd = &cmd->se_cmd;
224 struct usb_gadget *gadget = fuas_to_gadget(fu);
225 int ret;
226
227 if (!cmd->data_len) {
228 cmd->csw_code = US_BULK_STAT_PHASE;
229 bot_send_bad_status(cmd);
230 return 0;
231 }
232
233 if (!gadget->sg_supported) {
234 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
235 if (!cmd->data_buf)
236 return -ENOMEM;
237
238 sg_copy_to_buffer(se_cmd->t_data_sg,
239 se_cmd->t_data_nents,
240 cmd->data_buf,
241 se_cmd->data_length);
242
243 fu->bot_req_in->buf = cmd->data_buf;
244 } else {
245 fu->bot_req_in->buf = NULL;
246 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
247 fu->bot_req_in->sg = se_cmd->t_data_sg;
248 }
249
250 fu->bot_req_in->complete = bot_read_compl;
251 fu->bot_req_in->length = se_cmd->data_length;
252 fu->bot_req_in->context = cmd;
253 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
254 if (ret)
255 pr_err("%s(%d)\n", __func__, __LINE__);
256 return 0;
257}
258
259static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
260static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
261
262static int bot_send_write_request(struct usbg_cmd *cmd)
263{
264 struct f_uas *fu = cmd->fu;
265 struct se_cmd *se_cmd = &cmd->se_cmd;
266 struct usb_gadget *gadget = fuas_to_gadget(fu);
267 int ret;
268
269 init_completion(&cmd->write_complete);
270 cmd->fu = fu;
271
272 if (!cmd->data_len) {
273 cmd->csw_code = US_BULK_STAT_PHASE;
274 return -EINVAL;
275 }
276
277 if (!gadget->sg_supported) {
278 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
279 if (!cmd->data_buf)
280 return -ENOMEM;
281
282 fu->bot_req_out->buf = cmd->data_buf;
283 } else {
284 fu->bot_req_out->buf = NULL;
285 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
286 fu->bot_req_out->sg = se_cmd->t_data_sg;
287 }
288
289 fu->bot_req_out->complete = usbg_data_write_cmpl;
290 fu->bot_req_out->length = se_cmd->data_length;
291 fu->bot_req_out->context = cmd;
292
293 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
294 if (ret)
295 goto cleanup;
296 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
297 if (ret)
298 pr_err("%s(%d)\n", __func__, __LINE__);
299
300 wait_for_completion(&cmd->write_complete);
301 target_execute_cmd(se_cmd);
302cleanup:
303 return ret;
304}
305
306static int bot_submit_command(struct f_uas *, void *, unsigned int);
307
308static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
309{
310 struct f_uas *fu = req->context;
311 int ret;
312
313 fu->flags &= ~USBG_BOT_CMD_PEND;
314
315 if (req->status < 0)
316 return;
317
318 ret = bot_submit_command(fu, req->buf, req->actual);
319 if (ret)
320 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
321}
322
323static int bot_prepare_reqs(struct f_uas *fu)
324{
325 int ret;
326
327 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
328 if (!fu->bot_req_in)
329 goto err;
330
331 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
332 if (!fu->bot_req_out)
333 goto err_out;
334
335 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
336 if (!fu->cmd.req)
337 goto err_cmd;
338
339 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
340 if (!fu->bot_status.req)
341 goto err_sts;
342
343 fu->bot_status.req->buf = &fu->bot_status.csw;
344 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
345 fu->bot_status.req->complete = bot_status_complete;
346 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
347
348 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
349 if (!fu->cmd.buf)
350 goto err_buf;
351
352 fu->cmd.req->complete = bot_cmd_complete;
353 fu->cmd.req->buf = fu->cmd.buf;
354 fu->cmd.req->length = fu->ep_out->maxpacket;
355 fu->cmd.req->context = fu;
356
357 ret = bot_enqueue_cmd_cbw(fu);
358 if (ret)
359 goto err_queue;
360 return 0;
361err_queue:
362 kfree(fu->cmd.buf);
363 fu->cmd.buf = NULL;
364err_buf:
365 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
366err_sts:
367 usb_ep_free_request(fu->ep_out, fu->cmd.req);
368 fu->cmd.req = NULL;
369err_cmd:
370 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
371 fu->bot_req_out = NULL;
372err_out:
373 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
374 fu->bot_req_in = NULL;
375err:
376 pr_err("BOT: endpoint setup failed\n");
377 return -ENOMEM;
378}
379
380static void bot_cleanup_old_alt(struct f_uas *fu)
381{
382 if (!(fu->flags & USBG_ENABLED))
383 return;
384
385 usb_ep_disable(fu->ep_in);
386 usb_ep_disable(fu->ep_out);
387
388 if (!fu->bot_req_in)
389 return;
390
391 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
392 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
393 usb_ep_free_request(fu->ep_out, fu->cmd.req);
394 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
395
396 kfree(fu->cmd.buf);
397
398 fu->bot_req_in = NULL;
399 fu->bot_req_out = NULL;
400 fu->cmd.req = NULL;
401 fu->bot_status.req = NULL;
402 fu->cmd.buf = NULL;
403}
404
405static void bot_set_alt(struct f_uas *fu)
406{
407 struct usb_function *f = &fu->function;
408 struct usb_gadget *gadget = f->config->cdev->gadget;
409 int ret;
410
411 fu->flags = USBG_IS_BOT;
412
413 config_ep_by_speed(gadget, f, fu->ep_in);
414 ret = usb_ep_enable(fu->ep_in);
415 if (ret)
416 goto err_b_in;
417
418 config_ep_by_speed(gadget, f, fu->ep_out);
419 ret = usb_ep_enable(fu->ep_out);
420 if (ret)
421 goto err_b_out;
422
423 ret = bot_prepare_reqs(fu);
424 if (ret)
425 goto err_wq;
426 fu->flags |= USBG_ENABLED;
427 pr_info("Using the BOT protocol\n");
428 return;
429err_wq:
430 usb_ep_disable(fu->ep_out);
431err_b_out:
432 usb_ep_disable(fu->ep_in);
433err_b_in:
434 fu->flags = USBG_IS_BOT;
435}
436
437static int usbg_bot_setup(struct usb_function *f,
438 const struct usb_ctrlrequest *ctrl)
439{
440 struct f_uas *fu = to_f_uas(f);
441 struct usb_composite_dev *cdev = f->config->cdev;
442 u16 w_value = le16_to_cpu(ctrl->wValue);
443 u16 w_length = le16_to_cpu(ctrl->wLength);
444 int luns;
445 u8 *ret_lun;
446
447 switch (ctrl->bRequest) {
448 case US_BULK_GET_MAX_LUN:
449 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
450 USB_RECIP_INTERFACE))
451 return -ENOTSUPP;
452
453 if (w_length < 1)
454 return -EINVAL;
455 if (w_value != 0)
456 return -EINVAL;
457 luns = atomic_read(&fu->tpg->tpg_port_count);
458 if (!luns) {
459 pr_err("No LUNs configured?\n");
460 return -EINVAL;
461 }
462 /*
463 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
464 * accessed. The upper limit is 0xf
465 */
466 luns--;
467 if (luns > 0xf) {
468 pr_info_once("Limiting the number of luns to 16\n");
469 luns = 0xf;
470 }
471 ret_lun = cdev->req->buf;
472 *ret_lun = luns;
473 cdev->req->length = 1;
474 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
475
476 case US_BULK_RESET_REQUEST:
477 /* XXX maybe we should remove previous requests for IN + OUT */
478 bot_enqueue_cmd_cbw(fu);
479 return 0;
480 }
481 return -ENOTSUPP;
482}
483
484/* Start uas.c code */
485
486static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
487{
488 /* We have either all three allocated or none */
489 if (!stream->req_in)
490 return;
491
492 usb_ep_free_request(fu->ep_in, stream->req_in);
493 usb_ep_free_request(fu->ep_out, stream->req_out);
494 usb_ep_free_request(fu->ep_status, stream->req_status);
495
496 stream->req_in = NULL;
497 stream->req_out = NULL;
498 stream->req_status = NULL;
499}
500
501static void uasp_free_cmdreq(struct f_uas *fu)
502{
503 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
504 kfree(fu->cmd.buf);
505 fu->cmd.req = NULL;
506 fu->cmd.buf = NULL;
507}
508
509static void uasp_cleanup_old_alt(struct f_uas *fu)
510{
511 int i;
512
513 if (!(fu->flags & USBG_ENABLED))
514 return;
515
516 usb_ep_disable(fu->ep_in);
517 usb_ep_disable(fu->ep_out);
518 usb_ep_disable(fu->ep_status);
519 usb_ep_disable(fu->ep_cmd);
520
521 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
522 uasp_cleanup_one_stream(fu, &fu->stream[i]);
523 uasp_free_cmdreq(fu);
524}
525
526static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
527
528static int uasp_prepare_r_request(struct usbg_cmd *cmd)
529{
530 struct se_cmd *se_cmd = &cmd->se_cmd;
531 struct f_uas *fu = cmd->fu;
532 struct usb_gadget *gadget = fuas_to_gadget(fu);
533 struct uas_stream *stream = cmd->stream;
534
535 if (!gadget->sg_supported) {
536 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
537 if (!cmd->data_buf)
538 return -ENOMEM;
539
540 sg_copy_to_buffer(se_cmd->t_data_sg,
541 se_cmd->t_data_nents,
542 cmd->data_buf,
543 se_cmd->data_length);
544
545 stream->req_in->buf = cmd->data_buf;
546 } else {
547 stream->req_in->buf = NULL;
548 stream->req_in->num_sgs = se_cmd->t_data_nents;
549 stream->req_in->sg = se_cmd->t_data_sg;
550 }
551
552 stream->req_in->complete = uasp_status_data_cmpl;
553 stream->req_in->length = se_cmd->data_length;
554 stream->req_in->context = cmd;
555
556 cmd->state = UASP_SEND_STATUS;
557 return 0;
558}
559
560static void uasp_prepare_status(struct usbg_cmd *cmd)
561{
562 struct se_cmd *se_cmd = &cmd->se_cmd;
563 struct sense_iu *iu = &cmd->sense_iu;
564 struct uas_stream *stream = cmd->stream;
565
566 cmd->state = UASP_QUEUE_COMMAND;
567 iu->iu_id = IU_ID_STATUS;
568 iu->tag = cpu_to_be16(cmd->tag);
569
570 /*
571 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
572 */
573 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
574 iu->status = se_cmd->scsi_status;
575 stream->req_status->context = cmd;
576 stream->req_status->length = se_cmd->scsi_sense_length + 16;
577 stream->req_status->buf = iu;
578 stream->req_status->complete = uasp_status_data_cmpl;
579}
580
581static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
582{
583 struct usbg_cmd *cmd = req->context;
584 struct uas_stream *stream = cmd->stream;
585 struct f_uas *fu = cmd->fu;
586 int ret;
587
588 if (req->status < 0)
589 goto cleanup;
590
591 switch (cmd->state) {
592 case UASP_SEND_DATA:
593 ret = uasp_prepare_r_request(cmd);
594 if (ret)
595 goto cleanup;
596 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
597 if (ret)
598 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
599 break;
600
601 case UASP_RECEIVE_DATA:
602 ret = usbg_prepare_w_request(cmd, stream->req_out);
603 if (ret)
604 goto cleanup;
605 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
606 if (ret)
607 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
608 break;
609
610 case UASP_SEND_STATUS:
611 uasp_prepare_status(cmd);
612 ret = usb_ep_queue(fu->ep_status, stream->req_status,
613 GFP_ATOMIC);
614 if (ret)
615 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
616 break;
617
618 case UASP_QUEUE_COMMAND:
619 usbg_cleanup_cmd(cmd);
620 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
621 break;
622
623 default:
624 BUG();
625 }
626 return;
627
628cleanup:
629 usbg_cleanup_cmd(cmd);
630}
631
632static int uasp_send_status_response(struct usbg_cmd *cmd)
633{
634 struct f_uas *fu = cmd->fu;
635 struct uas_stream *stream = cmd->stream;
636 struct sense_iu *iu = &cmd->sense_iu;
637
638 iu->tag = cpu_to_be16(cmd->tag);
639 stream->req_status->complete = uasp_status_data_cmpl;
640 stream->req_status->context = cmd;
641 cmd->fu = fu;
642 uasp_prepare_status(cmd);
643 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
644}
645
646static int uasp_send_read_response(struct usbg_cmd *cmd)
647{
648 struct f_uas *fu = cmd->fu;
649 struct uas_stream *stream = cmd->stream;
650 struct sense_iu *iu = &cmd->sense_iu;
651 int ret;
652
653 cmd->fu = fu;
654
655 iu->tag = cpu_to_be16(cmd->tag);
656 if (fu->flags & USBG_USE_STREAMS) {
657
658 ret = uasp_prepare_r_request(cmd);
659 if (ret)
660 goto out;
661 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
662 if (ret) {
663 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
664 kfree(cmd->data_buf);
665 cmd->data_buf = NULL;
666 }
667
668 } else {
669
670 iu->iu_id = IU_ID_READ_READY;
671 iu->tag = cpu_to_be16(cmd->tag);
672
673 stream->req_status->complete = uasp_status_data_cmpl;
674 stream->req_status->context = cmd;
675
676 cmd->state = UASP_SEND_DATA;
677 stream->req_status->buf = iu;
678 stream->req_status->length = sizeof(struct iu);
679
680 ret = usb_ep_queue(fu->ep_status, stream->req_status,
681 GFP_ATOMIC);
682 if (ret)
683 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
684 }
685out:
686 return ret;
687}
688
689static int uasp_send_write_request(struct usbg_cmd *cmd)
690{
691 struct f_uas *fu = cmd->fu;
692 struct se_cmd *se_cmd = &cmd->se_cmd;
693 struct uas_stream *stream = cmd->stream;
694 struct sense_iu *iu = &cmd->sense_iu;
695 int ret;
696
697 init_completion(&cmd->write_complete);
698 cmd->fu = fu;
699
700 iu->tag = cpu_to_be16(cmd->tag);
701
702 if (fu->flags & USBG_USE_STREAMS) {
703
704 ret = usbg_prepare_w_request(cmd, stream->req_out);
705 if (ret)
706 goto cleanup;
707 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
708 if (ret)
709 pr_err("%s(%d)\n", __func__, __LINE__);
710
711 } else {
712
713 iu->iu_id = IU_ID_WRITE_READY;
714 iu->tag = cpu_to_be16(cmd->tag);
715
716 stream->req_status->complete = uasp_status_data_cmpl;
717 stream->req_status->context = cmd;
718
719 cmd->state = UASP_RECEIVE_DATA;
720 stream->req_status->buf = iu;
721 stream->req_status->length = sizeof(struct iu);
722
723 ret = usb_ep_queue(fu->ep_status, stream->req_status,
724 GFP_ATOMIC);
725 if (ret)
726 pr_err("%s(%d)\n", __func__, __LINE__);
727 }
728
729 wait_for_completion(&cmd->write_complete);
730 target_execute_cmd(se_cmd);
731cleanup:
732 return ret;
733}
734
735static int usbg_submit_command(struct f_uas *, void *, unsigned int);
736
737static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
738{
739 struct f_uas *fu = req->context;
740 int ret;
741
742 if (req->status < 0)
743 return;
744
745 ret = usbg_submit_command(fu, req->buf, req->actual);
746 /*
747 * Once we tune for performance enqueue the command req here again so
748 * we can receive a second command while we processing this one. Pay
749 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
750 * don't break HS.
751 */
752 if (!ret)
753 return;
754 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
755}
756
757static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
758{
759 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
760 if (!stream->req_in)
761 goto out;
762
763 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
764 if (!stream->req_out)
765 goto err_out;
766
767 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
768 if (!stream->req_status)
769 goto err_sts;
770
771 return 0;
772err_sts:
773 usb_ep_free_request(fu->ep_status, stream->req_status);
774 stream->req_status = NULL;
775err_out:
776 usb_ep_free_request(fu->ep_out, stream->req_out);
777 stream->req_out = NULL;
778out:
779 return -ENOMEM;
780}
781
782static int uasp_alloc_cmd(struct f_uas *fu)
783{
784 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
785 if (!fu->cmd.req)
786 goto err;
787
788 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
789 if (!fu->cmd.buf)
790 goto err_buf;
791
792 fu->cmd.req->complete = uasp_cmd_complete;
793 fu->cmd.req->buf = fu->cmd.buf;
794 fu->cmd.req->length = fu->ep_cmd->maxpacket;
795 fu->cmd.req->context = fu;
796 return 0;
797
798err_buf:
799 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
800err:
801 return -ENOMEM;
802}
803
804static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
805{
806 int i;
807
808 for (i = 0; i < max_streams; i++) {
809 struct uas_stream *s = &fu->stream[i];
810
811 s->req_in->stream_id = i + 1;
812 s->req_out->stream_id = i + 1;
813 s->req_status->stream_id = i + 1;
814 }
815}
816
817static int uasp_prepare_reqs(struct f_uas *fu)
818{
819 int ret;
820 int i;
821 int max_streams;
822
823 if (fu->flags & USBG_USE_STREAMS)
824 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
825 else
826 max_streams = 1;
827
828 for (i = 0; i < max_streams; i++) {
829 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
830 if (ret)
831 goto err_cleanup;
832 }
833
834 ret = uasp_alloc_cmd(fu);
835 if (ret)
836 goto err_free_stream;
837 uasp_setup_stream_res(fu, max_streams);
838
839 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
840 if (ret)
841 goto err_free_stream;
842
843 return 0;
844
845err_free_stream:
846 uasp_free_cmdreq(fu);
847
848err_cleanup:
849 if (i) {
850 do {
851 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
852 i--;
853 } while (i);
854 }
855 pr_err("UASP: endpoint setup failed\n");
856 return ret;
857}
858
859static void uasp_set_alt(struct f_uas *fu)
860{
861 struct usb_function *f = &fu->function;
862 struct usb_gadget *gadget = f->config->cdev->gadget;
863 int ret;
864
865 fu->flags = USBG_IS_UAS;
866
867 if (gadget->speed == USB_SPEED_SUPER)
868 fu->flags |= USBG_USE_STREAMS;
869
870 config_ep_by_speed(gadget, f, fu->ep_in);
871 ret = usb_ep_enable(fu->ep_in);
872 if (ret)
873 goto err_b_in;
874
875 config_ep_by_speed(gadget, f, fu->ep_out);
876 ret = usb_ep_enable(fu->ep_out);
877 if (ret)
878 goto err_b_out;
879
880 config_ep_by_speed(gadget, f, fu->ep_cmd);
881 ret = usb_ep_enable(fu->ep_cmd);
882 if (ret)
883 goto err_cmd;
884 config_ep_by_speed(gadget, f, fu->ep_status);
885 ret = usb_ep_enable(fu->ep_status);
886 if (ret)
887 goto err_status;
888
889 ret = uasp_prepare_reqs(fu);
890 if (ret)
891 goto err_wq;
892 fu->flags |= USBG_ENABLED;
893
894 pr_info("Using the UAS protocol\n");
895 return;
896err_wq:
897 usb_ep_disable(fu->ep_status);
898err_status:
899 usb_ep_disable(fu->ep_cmd);
900err_cmd:
901 usb_ep_disable(fu->ep_out);
902err_b_out:
903 usb_ep_disable(fu->ep_in);
904err_b_in:
905 fu->flags = 0;
906}
907
908static int get_cmd_dir(const unsigned char *cdb)
909{
910 int ret;
911
912 switch (cdb[0]) {
913 case READ_6:
914 case READ_10:
915 case READ_12:
916 case READ_16:
917 case INQUIRY:
918 case MODE_SENSE:
919 case MODE_SENSE_10:
920 case SERVICE_ACTION_IN_16:
921 case MAINTENANCE_IN:
922 case PERSISTENT_RESERVE_IN:
923 case SECURITY_PROTOCOL_IN:
924 case ACCESS_CONTROL_IN:
925 case REPORT_LUNS:
926 case READ_BLOCK_LIMITS:
927 case READ_POSITION:
928 case READ_CAPACITY:
929 case READ_TOC:
930 case READ_FORMAT_CAPACITIES:
931 case REQUEST_SENSE:
932 ret = DMA_FROM_DEVICE;
933 break;
934
935 case WRITE_6:
936 case WRITE_10:
937 case WRITE_12:
938 case WRITE_16:
939 case MODE_SELECT:
940 case MODE_SELECT_10:
941 case WRITE_VERIFY:
942 case WRITE_VERIFY_12:
943 case PERSISTENT_RESERVE_OUT:
944 case MAINTENANCE_OUT:
945 case SECURITY_PROTOCOL_OUT:
946 case ACCESS_CONTROL_OUT:
947 ret = DMA_TO_DEVICE;
948 break;
949 case ALLOW_MEDIUM_REMOVAL:
950 case TEST_UNIT_READY:
951 case SYNCHRONIZE_CACHE:
952 case START_STOP:
953 case ERASE:
954 case REZERO_UNIT:
955 case SEEK_10:
956 case SPACE:
957 case VERIFY:
958 case WRITE_FILEMARKS:
959 ret = DMA_NONE;
960 break;
961 default:
962#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
963 pr_warn(CMD_DIR_MSG, cdb[0]);
964#undef CMD_DIR_MSG
965 ret = -EINVAL;
966 }
967 return ret;
968}
969
970static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
971{
972 struct usbg_cmd *cmd = req->context;
973 struct se_cmd *se_cmd = &cmd->se_cmd;
974
975 if (req->status < 0) {
976 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
977 goto cleanup;
978 }
979
980 if (req->num_sgs == 0) {
981 sg_copy_from_buffer(se_cmd->t_data_sg,
982 se_cmd->t_data_nents,
983 cmd->data_buf,
984 se_cmd->data_length);
985 }
986
987 complete(&cmd->write_complete);
988 return;
989
990cleanup:
991 usbg_cleanup_cmd(cmd);
992}
993
994static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
995{
996 struct se_cmd *se_cmd = &cmd->se_cmd;
997 struct f_uas *fu = cmd->fu;
998 struct usb_gadget *gadget = fuas_to_gadget(fu);
999
1000 if (!gadget->sg_supported) {
1001 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
1002 if (!cmd->data_buf)
1003 return -ENOMEM;
1004
1005 req->buf = cmd->data_buf;
1006 } else {
1007 req->buf = NULL;
1008 req->num_sgs = se_cmd->t_data_nents;
1009 req->sg = se_cmd->t_data_sg;
1010 }
1011
1012 req->complete = usbg_data_write_cmpl;
1013 req->length = se_cmd->data_length;
1014 req->context = cmd;
1015 return 0;
1016}
1017
1018static int usbg_send_status_response(struct se_cmd *se_cmd)
1019{
1020 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1021 se_cmd);
1022 struct f_uas *fu = cmd->fu;
1023
1024 if (fu->flags & USBG_IS_BOT)
1025 return bot_send_status_response(cmd);
1026 else
1027 return uasp_send_status_response(cmd);
1028}
1029
1030static int usbg_send_write_request(struct se_cmd *se_cmd)
1031{
1032 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1033 se_cmd);
1034 struct f_uas *fu = cmd->fu;
1035
1036 if (fu->flags & USBG_IS_BOT)
1037 return bot_send_write_request(cmd);
1038 else
1039 return uasp_send_write_request(cmd);
1040}
1041
1042static int usbg_send_read_response(struct se_cmd *se_cmd)
1043{
1044 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1045 se_cmd);
1046 struct f_uas *fu = cmd->fu;
1047
1048 if (fu->flags & USBG_IS_BOT)
1049 return bot_send_read_response(cmd);
1050 else
1051 return uasp_send_read_response(cmd);
1052}
1053
1054static void usbg_cmd_work(struct work_struct *work)
1055{
1056 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1057 struct se_cmd *se_cmd;
1058 struct tcm_usbg_nexus *tv_nexus;
1059 struct usbg_tpg *tpg;
1060 int dir;
1061
1062 se_cmd = &cmd->se_cmd;
1063 tpg = cmd->fu->tpg;
1064 tv_nexus = tpg->tpg_nexus;
1065 dir = get_cmd_dir(cmd->cmd_buf);
1066 if (dir < 0) {
1067 transport_init_se_cmd(se_cmd,
1068 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1069 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1070 cmd->prio_attr, cmd->sense_iu.sense);
1071 goto out;
1072 }
1073
1074 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1075 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1076 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1077 goto out;
1078
1079 return;
1080
1081out:
1082 transport_send_check_condition_and_sense(se_cmd,
1083 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1084 usbg_cleanup_cmd(cmd);
1085}
1086
1087static int usbg_submit_command(struct f_uas *fu,
1088 void *cmdbuf, unsigned int len)
1089{
1090 struct command_iu *cmd_iu = cmdbuf;
1091 struct usbg_cmd *cmd;
1092 struct usbg_tpg *tpg;
1093 struct se_cmd *se_cmd;
1094 struct tcm_usbg_nexus *tv_nexus;
1095 u32 cmd_len;
1096
1097 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1098 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1099 return -EINVAL;
1100 }
1101
1102 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1103 if (!cmd)
1104 return -ENOMEM;
1105
1106 cmd->fu = fu;
1107
1108 /* XXX until I figure out why I can't free in on complete */
1109 kref_init(&cmd->ref);
1110 kref_get(&cmd->ref);
1111
1112 tpg = fu->tpg;
1113 cmd_len = (cmd_iu->len & ~0x3) + 16;
1114 if (cmd_len > USBG_MAX_CMD)
1115 goto err;
1116
1117 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1118
1119 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1120 cmd->se_cmd.tag = cmd->tag;
1121 if (fu->flags & USBG_USE_STREAMS) {
1122 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1123 goto err;
1124 if (!cmd->tag)
1125 cmd->stream = &fu->stream[0];
1126 else
1127 cmd->stream = &fu->stream[cmd->tag - 1];
1128 } else {
1129 cmd->stream = &fu->stream[0];
1130 }
1131
1132 tv_nexus = tpg->tpg_nexus;
1133 if (!tv_nexus) {
1134 pr_err("Missing nexus, ignoring command\n");
1135 goto err;
1136 }
1137
1138 switch (cmd_iu->prio_attr & 0x7) {
1139 case UAS_HEAD_TAG:
1140 cmd->prio_attr = TCM_HEAD_TAG;
1141 break;
1142 case UAS_ORDERED_TAG:
1143 cmd->prio_attr = TCM_ORDERED_TAG;
1144 break;
1145 case UAS_ACA:
1146 cmd->prio_attr = TCM_ACA_TAG;
1147 break;
1148 default:
1149 pr_debug_once("Unsupported prio_attr: %02x.\n",
1150 cmd_iu->prio_attr);
1151 case UAS_SIMPLE_TAG:
1152 cmd->prio_attr = TCM_SIMPLE_TAG;
1153 break;
1154 }
1155
1156 se_cmd = &cmd->se_cmd;
1157 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1158
1159 INIT_WORK(&cmd->work, usbg_cmd_work);
1160 queue_work(tpg->workqueue, &cmd->work);
1161
1162 return 0;
1163err:
1164 kfree(cmd);
1165 return -EINVAL;
1166}
1167
1168static void bot_cmd_work(struct work_struct *work)
1169{
1170 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1171 struct se_cmd *se_cmd;
1172 struct tcm_usbg_nexus *tv_nexus;
1173 struct usbg_tpg *tpg;
1174 int dir;
1175
1176 se_cmd = &cmd->se_cmd;
1177 tpg = cmd->fu->tpg;
1178 tv_nexus = tpg->tpg_nexus;
1179 dir = get_cmd_dir(cmd->cmd_buf);
1180 if (dir < 0) {
1181 transport_init_se_cmd(se_cmd,
1182 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1183 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1184 cmd->prio_attr, cmd->sense_iu.sense);
1185 goto out;
1186 }
1187
1188 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1189 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1190 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1191 goto out;
1192
1193 return;
1194
1195out:
1196 transport_send_check_condition_and_sense(se_cmd,
1197 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1198 usbg_cleanup_cmd(cmd);
1199}
1200
1201static int bot_submit_command(struct f_uas *fu,
1202 void *cmdbuf, unsigned int len)
1203{
1204 struct bulk_cb_wrap *cbw = cmdbuf;
1205 struct usbg_cmd *cmd;
1206 struct usbg_tpg *tpg;
1207 struct se_cmd *se_cmd;
1208 struct tcm_usbg_nexus *tv_nexus;
1209 u32 cmd_len;
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 = TCM_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 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1252
1253 INIT_WORK(&cmd->work, bot_cmd_work);
1254 queue_work(tpg->workqueue, &cmd->work);
1255
1256 return 0;
1257err:
1258 kfree(cmd);
1259 return -EINVAL;
1260}
1261
1262/* Start fabric.c code */
1263
1264static int usbg_check_true(struct se_portal_group *se_tpg)
1265{
1266 return 1;
1267}
1268
1269static int usbg_check_false(struct se_portal_group *se_tpg)
1270{
1271 return 0;
1272}
1273
1274static char *usbg_get_fabric_name(void)
1275{
1276 return "usb_gadget";
1277}
1278
1279static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1280{
1281 struct usbg_tpg *tpg = container_of(se_tpg,
1282 struct usbg_tpg, se_tpg);
1283 struct usbg_tport *tport = tpg->tport;
1284
1285 return &tport->tport_name[0];
1286}
1287
1288static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1289{
1290 struct usbg_tpg *tpg = container_of(se_tpg,
1291 struct usbg_tpg, se_tpg);
1292 return tpg->tport_tpgt;
1293}
1294
1295static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1296{
1297 return 1;
1298}
1299
1300static void usbg_cmd_release(struct kref *ref)
1301{
1302 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1303 ref);
1304
1305 transport_generic_free_cmd(&cmd->se_cmd, 0);
1306}
1307
1308static void usbg_release_cmd(struct se_cmd *se_cmd)
1309{
1310 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1311 se_cmd);
1312 kfree(cmd->data_buf);
1313 kfree(cmd);
1314}
1315
1316static int usbg_shutdown_session(struct se_session *se_sess)
1317{
1318 return 0;
1319}
1320
1321static void usbg_close_session(struct se_session *se_sess)
1322{
1323}
1324
1325static u32 usbg_sess_get_index(struct se_session *se_sess)
1326{
1327 return 0;
1328}
1329
1330/*
1331 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1332 */
1333static int usbg_write_pending_status(struct se_cmd *se_cmd)
1334{
1335 return 0;
1336}
1337
1338static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1339{
1340}
1341
1342static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1343{
1344 return 0;
1345}
1346
1347static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1348{
1349}
1350
1351static void usbg_aborted_task(struct se_cmd *se_cmd)
1352{
1353}
1354
1355static const char *usbg_check_wwn(const char *name)
1356{
1357 const char *n;
1358 unsigned int len;
1359
1360 n = strstr(name, "naa.");
1361 if (!n)
1362 return NULL;
1363 n += 4;
1364 len = strlen(n);
1365 if (len == 0 || len > USBG_NAMELEN - 1)
1366 return NULL;
1367 return n;
1368}
1369
1370static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1371{
1372 if (!usbg_check_wwn(name))
1373 return -EINVAL;
1374 return 0;
1375}
1376
1377struct usbg_tpg *the_only_tpg_I_currently_have;
1378
1379static struct se_portal_group *usbg_make_tpg(
1380 struct se_wwn *wwn,
1381 struct config_group *group,
1382 const char *name)
1383{
1384 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1385 tport_wwn);
1386 struct usbg_tpg *tpg;
1387 unsigned long tpgt;
1388 int ret;
dc8c46a5
AP		 1389#ifndef USBF_TCM_INCLUDED
1390 struct f_tcm_opts *opts;
1391 unsigned i;
1392#endif
08a1cb0f
AP		 1393
1394 if (strstr(name, "tpgt_") != name)
1395 return ERR_PTR(-EINVAL);
1396 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1397 return ERR_PTR(-EINVAL);
1398 if (the_only_tpg_I_currently_have) {
1399 pr_err("Until the gadget framework can't handle multiple\n");
1400 pr_err("gadgets, you can't do this here.\n");
1401 return ERR_PTR(-EBUSY);
1402 }
dc8c46a5
AP		 1403#ifndef USBF_TCM_INCLUDED
1404 ret = -ENODEV;
1405 mutex_lock(&tpg_instances_lock);
1406 for (i = 0; i < TPG_INSTANCES; ++i)
1407 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1408 break;
1409 if (i == TPG_INSTANCES)
1410 goto unlock_inst;
1411
1412 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1413 func_inst);
1414 mutex_lock(&opts->dep_lock);
1415 if (!opts->ready)
1416 goto unlock_dep;
1417
1418 if (opts->has_dep && !try_module_get(opts->dependent))
1419 goto unlock_dep;
1420#endif
08a1cb0f
AP		 1421
1422 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
dc8c46a5 1423 ret = -ENOMEM;
08a1cb0f 1424 if (!tpg)
dc8c46a5 1425#ifdef USBF_TCM_INCLUDED
08a1cb0f 1426 return ERR_PTR(-ENOMEM);
dc8c46a5
AP		 1427#else
1428 goto unref_dep;
1429#endif
08a1cb0f
AP		 1430 mutex_init(&tpg->tpg_mutex);
1431 atomic_set(&tpg->tpg_port_count, 0);
1432 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1433 if (!tpg->workqueue) {
dc8c46a5
AP		 1434#ifndef USBF_TCM_INCLUDED
1435 goto free_tpg;
1436#endif
08a1cb0f
AP		 1437 kfree(tpg);
1438 return NULL;
1439 }
1440
1441 tpg->tport = tport;
1442 tpg->tport_tpgt = tpgt;
1443
1444 /*
1445 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1446 * pretend to be SAS..
1447 */
1448 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1449 if (ret < 0) {
dc8c46a5
AP		 1450#ifndef USBF_TCM_INCLUDED
1451 goto free_workqueue;
1452#endif
08a1cb0f
AP		 1453 destroy_workqueue(tpg->workqueue);
1454 kfree(tpg);
1455 return NULL;
1456 }
dc8c46a5
AP		 1457#ifndef USBF_TCM_INCLUDED
1458 tpg_instances[i].tpg = tpg;
1459 tpg->fi = tpg_instances[i].func_inst;
1460 mutex_unlock(&opts->dep_lock);
1461 mutex_unlock(&tpg_instances_lock);
1462#endif
08a1cb0f
AP		 1463 the_only_tpg_I_currently_have = tpg;
1464 return &tpg->se_tpg;
dc8c46a5
AP		 1465#ifndef USBF_TCM_INCLUDED
1466free_workqueue:
1467 destroy_workqueue(tpg->workqueue);
1468free_tpg:
1469 kfree(tpg);
1470unref_dep:
1471 module_put(opts->dependent);
1472unlock_dep:
1473 mutex_unlock(&opts->dep_lock);
1474unlock_inst:
1475 mutex_unlock(&tpg_instances_lock);
1476
1477 return ERR_PTR(ret);
1478#endif
08a1cb0f
AP		 1479}
1480
1481static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1482
1483static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1484{
1485 struct usbg_tpg *tpg = container_of(se_tpg,
1486 struct usbg_tpg, se_tpg);
dc8c46a5
AP		 1487#ifndef USBF_TCM_INCLUDED
1488 unsigned i;
1489 struct f_tcm_opts *opts;
1490#endif
08a1cb0f
AP		 1491
1492 tcm_usbg_drop_nexus(tpg);
1493 core_tpg_deregister(se_tpg);
1494 destroy_workqueue(tpg->workqueue);
dc8c46a5
AP		 1495
1496#ifndef USBF_TCM_INCLUDED
1497 mutex_lock(&tpg_instances_lock);
1498 for (i = 0; i < TPG_INSTANCES; ++i)
1499 if (tpg_instances[i].tpg == tpg)
1500 break;
1501 if (i < TPG_INSTANCES)
1502 tpg_instances[i].tpg = NULL;
1503 opts = container_of(tpg_instances[i].func_inst,
1504 struct f_tcm_opts, func_inst);
1505 mutex_lock(&opts->dep_lock);
1506 module_put(opts->dependent);
1507 mutex_unlock(&opts->dep_lock);
1508 mutex_unlock(&tpg_instances_lock);
1509#endif
08a1cb0f
AP		 1510 kfree(tpg);
1511 the_only_tpg_I_currently_have = NULL;
1512}
1513
1514static struct se_wwn *usbg_make_tport(
1515 struct target_fabric_configfs *tf,
1516 struct config_group *group,
1517 const char *name)
1518{
1519 struct usbg_tport *tport;
1520 const char *wnn_name;
1521 u64 wwpn = 0;
1522
1523 wnn_name = usbg_check_wwn(name);
1524 if (!wnn_name)
1525 return ERR_PTR(-EINVAL);
1526
1527 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1528 if (!(tport))
1529 return ERR_PTR(-ENOMEM);
dc8c46a5 1530
08a1cb0f
AP		 1531 tport->tport_wwpn = wwpn;
1532 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1533 return &tport->tport_wwn;
1534}
1535
1536static void usbg_drop_tport(struct se_wwn *wwn)
1537{
1538 struct usbg_tport *tport = container_of(wwn,
1539 struct usbg_tport, tport_wwn);
1540 kfree(tport);
1541}
1542
1543/*
1544 * If somebody feels like dropping the version property, go ahead.
1545 */
1546static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1547{
1548 return sprintf(page, "usb-gadget fabric module\n");
1549}
1550
1551CONFIGFS_ATTR_RO(usbg_wwn_, version);
1552
1553static struct configfs_attribute *usbg_wwn_attrs[] = {
1554 &usbg_wwn_attr_version,
1555 NULL,
1556};
1557
1558static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1559{
1560 struct se_portal_group *se_tpg = to_tpg(item);
1561 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1562
1563 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1564}
1565
1566static int usbg_attach(struct usbg_tpg *);
1567static void usbg_detach(struct usbg_tpg *);
1568
1569static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1570 const char *page, size_t count)
1571{
1572 struct se_portal_group *se_tpg = to_tpg(item);
1573 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1574 bool op;
1575 ssize_t ret;
1576
1577 ret = strtobool(page, &op);
1578 if (ret)
1579 return ret;
1580
1581 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1582 return -EINVAL;
1583
1584 if (op)
1585 ret = usbg_attach(tpg);
1586 else
1587 usbg_detach(tpg);
1588 if (ret)
1589 return ret;
1590
1591 tpg->gadget_connect = op;
1592
1593 return count;
1594}
1595
1596static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1597{
1598 struct se_portal_group *se_tpg = to_tpg(item);
1599 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1600 struct tcm_usbg_nexus *tv_nexus;
1601 ssize_t ret;
1602
1603 mutex_lock(&tpg->tpg_mutex);
1604 tv_nexus = tpg->tpg_nexus;
1605 if (!tv_nexus) {
1606 ret = -ENODEV;
1607 goto out;
1608 }
1609 ret = snprintf(page, PAGE_SIZE, "%s\n",
1610 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1611out:
1612 mutex_unlock(&tpg->tpg_mutex);
1613 return ret;
1614}
1615
1616static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1617{
1618 struct se_portal_group *se_tpg;
1619 struct tcm_usbg_nexus *tv_nexus;
1620 int ret;
1621
1622 mutex_lock(&tpg->tpg_mutex);
1623 if (tpg->tpg_nexus) {
1624 ret = -EEXIST;
1625 pr_debug("tpg->tpg_nexus already exists\n");
1626 goto err_unlock;
1627 }
1628 se_tpg = &tpg->se_tpg;
1629
1630 ret = -ENOMEM;
1631 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1632 if (!tv_nexus)
1633 goto err_unlock;
1634 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1635 if (IS_ERR(tv_nexus->tvn_se_sess))
1636 goto err_free;
1637
1638 /*
1639 * Since we are running in 'demo mode' this call with generate a
1640 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1641 * the SCSI Initiator port name of the passed configfs group 'name'.
1642 */
1643 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1644 se_tpg, name);
1645 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1646#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1647 pr_debug(MAKE_NEXUS_MSG, name);
1648#undef MAKE_NEXUS_MSG
1649 goto err_session;
1650 }
1651 /*
1652 * Now register the TCM vHost virtual I_T Nexus as active.
1653 */
1654 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1655 tv_nexus->tvn_se_sess, tv_nexus);
1656 tpg->tpg_nexus = tv_nexus;
1657 mutex_unlock(&tpg->tpg_mutex);
1658 return 0;
1659
1660err_session:
1661 transport_free_session(tv_nexus->tvn_se_sess);
1662err_free:
1663 kfree(tv_nexus);
1664err_unlock:
1665 mutex_unlock(&tpg->tpg_mutex);
1666 return ret;
1667}
1668
1669static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1670{
1671 struct se_session *se_sess;
1672 struct tcm_usbg_nexus *tv_nexus;
1673 int ret = -ENODEV;
1674
1675 mutex_lock(&tpg->tpg_mutex);
1676 tv_nexus = tpg->tpg_nexus;
1677 if (!tv_nexus)
1678 goto out;
1679
1680 se_sess = tv_nexus->tvn_se_sess;
1681 if (!se_sess)
1682 goto out;
1683
1684 if (atomic_read(&tpg->tpg_port_count)) {
1685 ret = -EPERM;
1686#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1687 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1688#undef MSG
1689 goto out;
1690 }
1691
1692 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1693 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1694 /*
1695 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1696 */
1697 transport_deregister_session(tv_nexus->tvn_se_sess);
1698 tpg->tpg_nexus = NULL;
1699
1700 kfree(tv_nexus);
1701 ret = 0;
1702out:
1703 mutex_unlock(&tpg->tpg_mutex);
1704 return ret;
1705}
1706
1707static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1708 const char *page, size_t count)
1709{
1710 struct se_portal_group *se_tpg = to_tpg(item);
1711 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1712 unsigned char i_port[USBG_NAMELEN], *ptr;
1713 int ret;
1714
1715 if (!strncmp(page, "NULL", 4)) {
1716 ret = tcm_usbg_drop_nexus(tpg);
1717 return (!ret) ? count : ret;
1718 }
1719 if (strlen(page) >= USBG_NAMELEN) {
1720
1721#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1722 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1723#undef NEXUS_STORE_MSG
1724 return -EINVAL;
1725 }
1726 snprintf(i_port, USBG_NAMELEN, "%s", page);
1727
1728 ptr = strstr(i_port, "naa.");
1729 if (!ptr) {
1730 pr_err("Missing 'naa.' prefix\n");
1731 return -EINVAL;
1732 }
1733
1734 if (i_port[strlen(i_port) - 1] == '\n')
1735 i_port[strlen(i_port) - 1] = '\0';
1736
1737 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1738 if (ret < 0)
1739 return ret;
1740 return count;
1741}
1742
1743CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1744CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1745
1746static struct configfs_attribute *usbg_base_attrs[] = {
1747 &tcm_usbg_tpg_attr_enable,
1748 &tcm_usbg_tpg_attr_nexus,
1749 NULL,
1750};
1751
1752static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1753{
1754 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1755
1756 atomic_inc(&tpg->tpg_port_count);
1757 smp_mb__after_atomic();
1758 return 0;
1759}
1760
1761static void usbg_port_unlink(struct se_portal_group *se_tpg,
1762 struct se_lun *se_lun)
1763{
1764 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1765
1766 atomic_dec(&tpg->tpg_port_count);
1767 smp_mb__after_atomic();
1768}
1769
1770static int usbg_check_stop_free(struct se_cmd *se_cmd)
1771{
1772 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1773 se_cmd);
1774
1775 kref_put(&cmd->ref, usbg_cmd_release);
1776 return 1;
1777}
1778
1779static const struct target_core_fabric_ops usbg_ops = {
1780 .module = THIS_MODULE,
1781 .name = "usb_gadget",
1782 .get_fabric_name = usbg_get_fabric_name,
1783 .tpg_get_wwn = usbg_get_fabric_wwn,
1784 .tpg_get_tag = usbg_get_tag,
1785 .tpg_check_demo_mode = usbg_check_true,
1786 .tpg_check_demo_mode_cache = usbg_check_false,
1787 .tpg_check_demo_mode_write_protect = usbg_check_false,
1788 .tpg_check_prod_mode_write_protect = usbg_check_false,
1789 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1790 .release_cmd = usbg_release_cmd,
1791 .shutdown_session = usbg_shutdown_session,
1792 .close_session = usbg_close_session,
1793 .sess_get_index = usbg_sess_get_index,
1794 .sess_get_initiator_sid = NULL,
1795 .write_pending = usbg_send_write_request,
1796 .write_pending_status = usbg_write_pending_status,
1797 .set_default_node_attributes = usbg_set_default_node_attrs,
1798 .get_cmd_state = usbg_get_cmd_state,
1799 .queue_data_in = usbg_send_read_response,
1800 .queue_status = usbg_send_status_response,
1801 .queue_tm_rsp = usbg_queue_tm_rsp,
1802 .aborted_task = usbg_aborted_task,
1803 .check_stop_free = usbg_check_stop_free,
1804
1805 .fabric_make_wwn = usbg_make_tport,
1806 .fabric_drop_wwn = usbg_drop_tport,
1807 .fabric_make_tpg = usbg_make_tpg,
1808 .fabric_drop_tpg = usbg_drop_tpg,
1809 .fabric_post_link = usbg_port_link,
1810 .fabric_pre_unlink = usbg_port_unlink,
1811 .fabric_init_nodeacl = usbg_init_nodeacl,
1812
1813 .tfc_wwn_attrs = usbg_wwn_attrs,
1814 .tfc_tpg_base_attrs = usbg_base_attrs,
1815};
1816
1817/* Start gadget.c code */
1818
1819static struct usb_interface_descriptor bot_intf_desc = {
1820 .bLength = sizeof(bot_intf_desc),
1821 .bDescriptorType = USB_DT_INTERFACE,
1822 .bNumEndpoints = 2,
1823 .bAlternateSetting = USB_G_ALT_INT_BBB,
1824 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1825 .bInterfaceSubClass = USB_SC_SCSI,
1826 .bInterfaceProtocol = USB_PR_BULK,
1827};
1828
1829static struct usb_interface_descriptor uasp_intf_desc = {
1830 .bLength = sizeof(uasp_intf_desc),
1831 .bDescriptorType = USB_DT_INTERFACE,
1832 .bNumEndpoints = 4,
1833 .bAlternateSetting = USB_G_ALT_INT_UAS,
1834 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1835 .bInterfaceSubClass = USB_SC_SCSI,
1836 .bInterfaceProtocol = USB_PR_UAS,
1837};
1838
1839static struct usb_endpoint_descriptor uasp_bi_desc = {
1840 .bLength = USB_DT_ENDPOINT_SIZE,
1841 .bDescriptorType = USB_DT_ENDPOINT,
1842 .bEndpointAddress = USB_DIR_IN,
1843 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1844 .wMaxPacketSize = cpu_to_le16(512),
1845};
1846
1847static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1848 .bLength = USB_DT_ENDPOINT_SIZE,
1849 .bDescriptorType = USB_DT_ENDPOINT,
1850 .bEndpointAddress = USB_DIR_IN,
1851 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1852};
1853
1854static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1855 .bLength = sizeof(uasp_bi_pipe_desc),
1856 .bDescriptorType = USB_DT_PIPE_USAGE,
1857 .bPipeID = DATA_IN_PIPE_ID,
1858};
1859
1860static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1861 .bLength = USB_DT_ENDPOINT_SIZE,
1862 .bDescriptorType = USB_DT_ENDPOINT,
1863 .bEndpointAddress = USB_DIR_IN,
1864 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1865 .wMaxPacketSize = cpu_to_le16(1024),
1866};
1867
1868static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1869 .bLength = sizeof(uasp_bi_ep_comp_desc),
1870 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1871 .bMaxBurst = 0,
1872 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1873 .wBytesPerInterval = 0,
1874};
1875
1876static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1877 .bLength = sizeof(bot_bi_ep_comp_desc),
1878 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1879 .bMaxBurst = 0,
1880};
1881
1882static struct usb_endpoint_descriptor uasp_bo_desc = {
1883 .bLength = USB_DT_ENDPOINT_SIZE,
1884 .bDescriptorType = USB_DT_ENDPOINT,
1885 .bEndpointAddress = USB_DIR_OUT,
1886 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1887 .wMaxPacketSize = cpu_to_le16(512),
1888};
1889
1890static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1891 .bLength = USB_DT_ENDPOINT_SIZE,
1892 .bDescriptorType = USB_DT_ENDPOINT,
1893 .bEndpointAddress = USB_DIR_OUT,
1894 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1895};
1896
1897static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1898 .bLength = sizeof(uasp_bo_pipe_desc),
1899 .bDescriptorType = USB_DT_PIPE_USAGE,
1900 .bPipeID = DATA_OUT_PIPE_ID,
1901};
1902
1903static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1904 .bLength = USB_DT_ENDPOINT_SIZE,
1905 .bDescriptorType = USB_DT_ENDPOINT,
1906 .bEndpointAddress = USB_DIR_OUT,
1907 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1908 .wMaxPacketSize = cpu_to_le16(0x400),
1909};
1910
1911static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1912 .bLength = sizeof(uasp_bo_ep_comp_desc),
1913 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1914 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1915};
1916
1917static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1918 .bLength = sizeof(bot_bo_ep_comp_desc),
1919 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1920};
1921
1922static struct usb_endpoint_descriptor uasp_status_desc = {
1923 .bLength = USB_DT_ENDPOINT_SIZE,
1924 .bDescriptorType = USB_DT_ENDPOINT,
1925 .bEndpointAddress = USB_DIR_IN,
1926 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1927 .wMaxPacketSize = cpu_to_le16(512),
1928};
1929
1930static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1931 .bLength = USB_DT_ENDPOINT_SIZE,
1932 .bDescriptorType = USB_DT_ENDPOINT,
1933 .bEndpointAddress = USB_DIR_IN,
1934 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1935};
1936
1937static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1938 .bLength = sizeof(uasp_status_pipe_desc),
1939 .bDescriptorType = USB_DT_PIPE_USAGE,
1940 .bPipeID = STATUS_PIPE_ID,
1941};
1942
1943static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1944 .bLength = USB_DT_ENDPOINT_SIZE,
1945 .bDescriptorType = USB_DT_ENDPOINT,
1946 .bEndpointAddress = USB_DIR_IN,
1947 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1948 .wMaxPacketSize = cpu_to_le16(1024),
1949};
1950
1951static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1952 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1953 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1954 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1955};
1956
1957static struct usb_endpoint_descriptor uasp_cmd_desc = {
1958 .bLength = USB_DT_ENDPOINT_SIZE,
1959 .bDescriptorType = USB_DT_ENDPOINT,
1960 .bEndpointAddress = USB_DIR_OUT,
1961 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1962 .wMaxPacketSize = cpu_to_le16(512),
1963};
1964
1965static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1966 .bLength = USB_DT_ENDPOINT_SIZE,
1967 .bDescriptorType = USB_DT_ENDPOINT,
1968 .bEndpointAddress = USB_DIR_OUT,
1969 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1970};
1971
1972static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1973 .bLength = sizeof(uasp_cmd_pipe_desc),
1974 .bDescriptorType = USB_DT_PIPE_USAGE,
1975 .bPipeID = CMD_PIPE_ID,
1976};
1977
1978static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1979 .bLength = USB_DT_ENDPOINT_SIZE,
1980 .bDescriptorType = USB_DT_ENDPOINT,
1981 .bEndpointAddress = USB_DIR_OUT,
1982 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1983 .wMaxPacketSize = cpu_to_le16(1024),
1984};
1985
1986static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1987 .bLength = sizeof(uasp_cmd_comp_desc),
1988 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1989};
1990
1991static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1992 (struct usb_descriptor_header *) &bot_intf_desc,
1993 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1994 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1995
1996 (struct usb_descriptor_header *) &uasp_intf_desc,
1997 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1998 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1999 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2000 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2001 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2002 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2003 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2004 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2005 NULL,
2006};
2007
2008static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2009 (struct usb_descriptor_header *) &bot_intf_desc,
2010 (struct usb_descriptor_header *) &uasp_bi_desc,
2011 (struct usb_descriptor_header *) &uasp_bo_desc,
2012
2013 (struct usb_descriptor_header *) &uasp_intf_desc,
2014 (struct usb_descriptor_header *) &uasp_bi_desc,
2015 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2016 (struct usb_descriptor_header *) &uasp_bo_desc,
2017 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2018 (struct usb_descriptor_header *) &uasp_status_desc,
2019 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2020 (struct usb_descriptor_header *) &uasp_cmd_desc,
2021 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2022 NULL,
2023};
2024
2025static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2026 (struct usb_descriptor_header *) &bot_intf_desc,
2027 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2028 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2029 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2030 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2031
2032 (struct usb_descriptor_header *) &uasp_intf_desc,
2033 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2034 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2035 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2036 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2037 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2038 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2039 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2040 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2041 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2042 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2043 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2044 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2045 NULL,
2046};
2047
2048static struct usb_string tcm_us_strings[] = {
2049 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
2050 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
2051 { },
2052};
2053
2054static struct usb_gadget_strings tcm_stringtab = {
2055 .language = 0x0409,
2056 .strings = tcm_us_strings,
2057};
2058
2059static struct usb_gadget_strings *tcm_strings[] = {
2060 &tcm_stringtab,
2061 NULL,
2062};
2063
2064static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
2065{
2066 struct f_uas *fu = to_f_uas(f);
2067 struct usb_gadget *gadget = c->cdev->gadget;
2068 struct usb_ep *ep;
dc8c46a5
AP		 2069#ifndef USBF_TCM_INCLUDED
2070 struct f_tcm_opts *opts;
2071#endif
08a1cb0f
AP		 2072 int iface;
2073 int ret;
2074
dc8c46a5
AP		 2075#ifndef USBF_TCM_INCLUDED
2076 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2077
2078 mutex_lock(&opts->dep_lock);
2079 if (!opts->can_attach) {
2080 mutex_unlock(&opts->dep_lock);
2081 return -ENODEV;
2082 }
2083 mutex_unlock(&opts->dep_lock);
2084#endif
2085 if (tcm_us_strings[0].id == 0) {
2086 ret = usb_string_ids_tab(c->cdev, tcm_us_strings);
2087 if (ret < 0)
2088 return ret;
2089
2090 bot_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_BBB].id;
2091 uasp_intf_desc.iInterface =
2092 tcm_us_strings[USB_G_STR_INT_UAS].id;
2093 }
2094
08a1cb0f
AP		 2095 iface = usb_interface_id(c, f);
2096 if (iface < 0)
2097 return iface;
2098
2099 bot_intf_desc.bInterfaceNumber = iface;
2100 uasp_intf_desc.bInterfaceNumber = iface;
2101 fu->iface = iface;
2102 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2103 &uasp_bi_ep_comp_desc);
2104 if (!ep)
2105 goto ep_fail;
2106
2107 fu->ep_in = ep;
2108
2109 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2110 &uasp_bo_ep_comp_desc);
2111 if (!ep)
2112 goto ep_fail;
2113 fu->ep_out = ep;
2114
2115 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2116 &uasp_status_in_ep_comp_desc);
2117 if (!ep)
2118 goto ep_fail;
2119 fu->ep_status = ep;
2120
2121 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2122 &uasp_cmd_comp_desc);
2123 if (!ep)
2124 goto ep_fail;
2125 fu->ep_cmd = ep;
2126
2127 /* Assume endpoint addresses are the same for both speeds */
2128 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2129 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2130 uasp_status_desc.bEndpointAddress =
2131 uasp_ss_status_desc.bEndpointAddress;
2132 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2133
2134 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2135 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2136 uasp_fs_status_desc.bEndpointAddress =
2137 uasp_ss_status_desc.bEndpointAddress;
2138 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2139
2140 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2141 uasp_hs_function_desc, uasp_ss_function_desc);
2142 if (ret)
2143 goto ep_fail;
2144
2145 return 0;
2146ep_fail:
2147 pr_err("Can't claim all required eps\n");
2148
2149 return -ENOTSUPP;
2150}
2151
dc8c46a5
AP		 2152#ifdef USBF_TCM_INCLUDED
2153
2154static void tcm_old_unbind(struct usb_configuration *c, struct usb_function *f)
08a1cb0f
AP		 2155{
2156 struct f_uas *fu = to_f_uas(f);
2157
2158 usb_free_all_descriptors(f);
2159 kfree(fu);
2160}
2161
dc8c46a5
AP		 2162#endif
2163
08a1cb0f
AP		 2164struct guas_setup_wq {
2165 struct work_struct work;
2166 struct f_uas *fu;
2167 unsigned int alt;
2168};
2169
2170static void tcm_delayed_set_alt(struct work_struct *wq)
2171{
2172 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2173 work);
2174 struct f_uas *fu = work->fu;
2175 int alt = work->alt;
2176
2177 kfree(work);
2178
2179 if (fu->flags & USBG_IS_BOT)
2180 bot_cleanup_old_alt(fu);
2181 if (fu->flags & USBG_IS_UAS)
2182 uasp_cleanup_old_alt(fu);
2183
2184 if (alt == USB_G_ALT_INT_BBB)
2185 bot_set_alt(fu);
2186 else if (alt == USB_G_ALT_INT_UAS)
2187 uasp_set_alt(fu);
2188 usb_composite_setup_continue(fu->function.config->cdev);
2189}
2190
2191static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2192{
2193 struct f_uas *fu = to_f_uas(f);
2194
2195 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2196 struct guas_setup_wq *work;
2197
2198 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2199 if (!work)
2200 return -ENOMEM;
2201 INIT_WORK(&work->work, tcm_delayed_set_alt);
2202 work->fu = fu;
2203 work->alt = alt;
2204 schedule_work(&work->work);
2205 return USB_GADGET_DELAYED_STATUS;
2206 }
2207 return -EOPNOTSUPP;
2208}
2209
2210static void tcm_disable(struct usb_function *f)
2211{
2212 struct f_uas *fu = to_f_uas(f);
2213
2214 if (fu->flags & USBG_IS_UAS)
2215 uasp_cleanup_old_alt(fu);
2216 else if (fu->flags & USBG_IS_BOT)
2217 bot_cleanup_old_alt(fu);
2218 fu->flags = 0;
2219}
2220
2221static int tcm_setup(struct usb_function *f,
2222 const struct usb_ctrlrequest *ctrl)
2223{
2224 struct f_uas *fu = to_f_uas(f);
2225
2226 if (!(fu->flags & USBG_IS_BOT))
2227 return -EOPNOTSUPP;
2228
2229 return usbg_bot_setup(f, ctrl);
2230}
2231
dc8c46a5
AP		 2232#ifdef USBF_TCM_INCLUDED
2233
08a1cb0f
AP		 2234static int tcm_bind_config(struct usb_configuration *c)
2235{
2236 struct f_uas *fu;
2237 int ret;
2238
2239 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2240 if (!fu)
2241 return -ENOMEM;
2242 fu->function.name = "Target Function";
2243 fu->function.bind = tcm_bind;
dc8c46a5 2244 fu->function.unbind = tcm_old_unbind;
08a1cb0f
AP		 2245 fu->function.set_alt = tcm_set_alt;
2246 fu->function.setup = tcm_setup;
2247 fu->function.disable = tcm_disable;
2248 fu->function.strings = tcm_strings;
2249 fu->tpg = the_only_tpg_I_currently_have;
2250
08a1cb0f
AP		 2251 ret = usb_add_function(c, &fu->function);
2252 if (ret)
2253 goto err;
2254
2255 return 0;
2256err:
2257 kfree(fu);
2258 return ret;
2259}
dc8c46a5
AP		 2260
2261#else
2262
2263static void tcm_free_inst(struct usb_function_instance *f)
2264{
2265 struct f_tcm_opts *opts;
2266 unsigned i;
2267
2268 opts = container_of(f, struct f_tcm_opts, func_inst);
2269
2270 mutex_lock(&tpg_instances_lock);
2271 for (i = 0; i < TPG_INSTANCES; ++i)
2272 if (tpg_instances[i].func_inst == f)
2273 break;
2274 if (i < TPG_INSTANCES)
2275 tpg_instances[i].func_inst = NULL;
2276 mutex_unlock(&tpg_instances_lock);
2277
2278 kfree(opts);
2279}
2280
2281static int usbg_attach(struct usbg_tpg *tpg)
2282{
2283 struct usb_function_instance *f = tpg->fi;
2284 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2285
2286 if (opts->tcm_register_callback)
2287 return opts->tcm_register_callback(f);
2288
2289 return 0;
2290}
2291
2292static void usbg_detach(struct usbg_tpg *tpg)
2293{
2294 struct usb_function_instance *f = tpg->fi;
2295 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2296
2297 if (opts->tcm_unregister_callback)
2298 opts->tcm_unregister_callback(f);
2299}
2300
2301static int tcm_set_name(struct usb_function_instance *f, const char *name)
2302{
2303 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2304
2305 pr_debug("tcm: Activating %s\n", name);
2306
2307 mutex_lock(&opts->dep_lock);
2308 opts->ready = true;
2309 mutex_unlock(&opts->dep_lock);
2310
2311 return 0;
2312}
2313
2314static struct usb_function_instance *tcm_alloc_inst(void)
2315{
2316 struct f_tcm_opts *opts;
2317 int i;
2318
2319
2320 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2321 if (!opts)
2322 return ERR_PTR(-ENOMEM);
2323
2324 mutex_lock(&tpg_instances_lock);
2325 for (i = 0; i < TPG_INSTANCES; ++i)
2326 if (!tpg_instances[i].func_inst)
2327 break;
2328
2329 if (i == TPG_INSTANCES) {
2330 mutex_unlock(&tpg_instances_lock);
2331 kfree(opts);
2332 return ERR_PTR(-EBUSY);
2333 }
2334 tpg_instances[i].func_inst = &opts->func_inst;
2335 mutex_unlock(&tpg_instances_lock);
2336
2337 mutex_init(&opts->dep_lock);
2338 opts->func_inst.set_inst_name = tcm_set_name;
2339 opts->func_inst.free_func_inst = tcm_free_inst;
2340
2341 return &opts->func_inst;
2342}
2343
2344static void tcm_free(struct usb_function *f)
2345{
2346 struct f_uas *tcm = to_f_uas(f);
2347
2348 kfree(tcm);
2349}
2350
2351static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2352{
2353 usb_free_all_descriptors(f);
2354}
2355
2356static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2357{
2358 struct f_uas *fu;
2359 struct f_tcm_opts *opts;
2360 unsigned i;
2361
2362 mutex_lock(&tpg_instances_lock);
2363 for (i = 0; i < TPG_INSTANCES; ++i)
2364 if (tpg_instances[i].func_inst == fi)
2365 break;
2366 if (i == TPG_INSTANCES) {
2367 mutex_unlock(&tpg_instances_lock);
2368 return ERR_PTR(-ENODEV);
2369 }
2370
2371 opts = container_of(fi, struct f_tcm_opts, func_inst);
2372
2373 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2374 if (!fu) {
2375 mutex_unlock(&tpg_instances_lock);
2376 return ERR_PTR(-ENOMEM);
2377 }
2378
2379 fu->function.name = "Target Function";
2380 fu->function.bind = tcm_bind;
2381 fu->function.unbind = tcm_unbind;
2382 fu->function.set_alt = tcm_set_alt;
2383 fu->function.setup = tcm_setup;
2384 fu->function.disable = tcm_disable;
2385 fu->function.strings = tcm_strings;
2386 fu->function.free_func = tcm_free;
2387 fu->tpg = tpg_instances[i].tpg;
2388 mutex_unlock(&tpg_instances_lock);
2389
2390 return &fu->function;
2391}
2392
2393DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2394
2395static int tcm_init(void)
2396{
2397 int ret;
2398
2399 ret = usb_function_register(&tcmusb_func);
2400 if (ret)
2401 return ret;
2402
2403 ret = target_register_template(&usbg_ops);
2404 if (ret)
2405 usb_function_unregister(&tcmusb_func);
2406
2407 return ret;
2408}
2409module_init(tcm_init);
2410
2411static void tcm_exit(void)
2412{
2413 target_unregister_template(&usbg_ops);
2414 usb_function_unregister(&tcmusb_func);
2415}
2416module_exit(tcm_exit);
2417
2418MODULE_LICENSE("GPL");
2419MODULE_AUTHOR("Sebastian Andrzej Siewior");
2420
2421#endif
Linux kernel - Deliverables
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