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Merge tag 'configfs-for-4.15' of git://git.infradead.org/users/hch/configfs
[mirror_ubuntu-bionic-kernel.git] / drivers / usb / gadget / function / f_tcm.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Target based USB-Gadget
3 *
4 * UAS protocol handling, target callbacks, configfs handling,
5 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
6 *
7 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
8 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/configfs.h>
14 #include <linux/ctype.h>
15 #include <linux/usb/ch9.h>
16 #include <linux/usb/composite.h>
17 #include <linux/usb/gadget.h>
18 #include <linux/usb/storage.h>
19 #include <scsi/scsi_tcq.h>
20 #include <target/target_core_base.h>
21 #include <target/target_core_fabric.h>
22 #include <asm/unaligned.h>
23
24 #include "tcm.h"
25 #include "u_tcm.h"
26 #include "configfs.h"
27
28 #define TPG_INSTANCES 1
29
30 struct tpg_instance {
31 struct usb_function_instance *func_inst;
32 struct usbg_tpg *tpg;
33 };
34
35 static struct tpg_instance tpg_instances[TPG_INSTANCES];
36
37 static DEFINE_MUTEX(tpg_instances_lock);
38
39 static inline struct f_uas *to_f_uas(struct usb_function *f)
40 {
41 return container_of(f, struct f_uas, function);
42 }
43
44 /* Start bot.c code */
45
46 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
47 {
48 int ret;
49
50 if (fu->flags & USBG_BOT_CMD_PEND)
51 return 0;
52
53 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
54 if (!ret)
55 fu->flags |= USBG_BOT_CMD_PEND;
56 return ret;
57 }
58
59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
60 {
61 struct usbg_cmd *cmd = req->context;
62 struct f_uas *fu = cmd->fu;
63
64 transport_generic_free_cmd(&cmd->se_cmd, 0);
65 if (req->status < 0) {
66 pr_err("ERR %s(%d)\n", __func__, __LINE__);
67 return;
68 }
69
70 /* CSW completed, wait for next CBW */
71 bot_enqueue_cmd_cbw(fu);
72 }
73
74 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
75 {
76 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
77 int ret;
78 unsigned int csw_stat;
79
80 csw_stat = cmd->csw_code;
81 csw->Tag = cmd->bot_tag;
82 csw->Status = csw_stat;
83 fu->bot_status.req->context = cmd;
84 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
85 if (ret)
86 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
87 }
88
89 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
90 {
91 struct usbg_cmd *cmd = req->context;
92 struct f_uas *fu = cmd->fu;
93
94 if (req->status < 0)
95 pr_err("ERR %s(%d)\n", __func__, __LINE__);
96
97 if (cmd->data_len) {
98 if (cmd->data_len > ep->maxpacket) {
99 req->length = ep->maxpacket;
100 cmd->data_len -= ep->maxpacket;
101 } else {
102 req->length = cmd->data_len;
103 cmd->data_len = 0;
104 }
105
106 usb_ep_queue(ep, req, GFP_ATOMIC);
107 return;
108 }
109 bot_enqueue_sense_code(fu, cmd);
110 }
111
112 static void bot_send_bad_status(struct usbg_cmd *cmd)
113 {
114 struct f_uas *fu = cmd->fu;
115 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
116 struct usb_request *req;
117 struct usb_ep *ep;
118
119 csw->Residue = cpu_to_le32(cmd->data_len);
120
121 if (cmd->data_len) {
122 if (cmd->is_read) {
123 ep = fu->ep_in;
124 req = fu->bot_req_in;
125 } else {
126 ep = fu->ep_out;
127 req = fu->bot_req_out;
128 }
129
130 if (cmd->data_len > fu->ep_in->maxpacket) {
131 req->length = ep->maxpacket;
132 cmd->data_len -= ep->maxpacket;
133 } else {
134 req->length = cmd->data_len;
135 cmd->data_len = 0;
136 }
137 req->complete = bot_err_compl;
138 req->context = cmd;
139 req->buf = fu->cmd.buf;
140 usb_ep_queue(ep, req, GFP_KERNEL);
141 } else {
142 bot_enqueue_sense_code(fu, cmd);
143 }
144 }
145
146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
147 {
148 struct f_uas *fu = cmd->fu;
149 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
150 int ret;
151
152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
153 if (!moved_data && cmd->data_len) {
154 /*
155 * the host wants to move data, we don't. Fill / empty
156 * the pipe and then send the csw with reside set.
157 */
158 cmd->csw_code = US_BULK_STAT_OK;
159 bot_send_bad_status(cmd);
160 return 0;
161 }
162
163 csw->Tag = cmd->bot_tag;
164 csw->Residue = cpu_to_le32(0);
165 csw->Status = US_BULK_STAT_OK;
166 fu->bot_status.req->context = cmd;
167
168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
169 if (ret)
170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
171 } else {
172 cmd->csw_code = US_BULK_STAT_FAIL;
173 bot_send_bad_status(cmd);
174 }
175 return 0;
176 }
177
178 /*
179 * Called after command (no data transfer) or after the write (to device)
180 * operation is completed
181 */
182 static int bot_send_status_response(struct usbg_cmd *cmd)
183 {
184 bool moved_data = false;
185
186 if (!cmd->is_read)
187 moved_data = true;
188 return bot_send_status(cmd, moved_data);
189 }
190
191 /* Read request completed, now we have to send the CSW */
192 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
193 {
194 struct usbg_cmd *cmd = req->context;
195
196 if (req->status < 0)
197 pr_err("ERR %s(%d)\n", __func__, __LINE__);
198
199 bot_send_status(cmd, true);
200 }
201
202 static int bot_send_read_response(struct usbg_cmd *cmd)
203 {
204 struct f_uas *fu = cmd->fu;
205 struct se_cmd *se_cmd = &cmd->se_cmd;
206 struct usb_gadget *gadget = fuas_to_gadget(fu);
207 int ret;
208
209 if (!cmd->data_len) {
210 cmd->csw_code = US_BULK_STAT_PHASE;
211 bot_send_bad_status(cmd);
212 return 0;
213 }
214
215 if (!gadget->sg_supported) {
216 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
217 if (!cmd->data_buf)
218 return -ENOMEM;
219
220 sg_copy_to_buffer(se_cmd->t_data_sg,
221 se_cmd->t_data_nents,
222 cmd->data_buf,
223 se_cmd->data_length);
224
225 fu->bot_req_in->buf = cmd->data_buf;
226 } else {
227 fu->bot_req_in->buf = NULL;
228 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
229 fu->bot_req_in->sg = se_cmd->t_data_sg;
230 }
231
232 fu->bot_req_in->complete = bot_read_compl;
233 fu->bot_req_in->length = se_cmd->data_length;
234 fu->bot_req_in->context = cmd;
235 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
236 if (ret)
237 pr_err("%s(%d)\n", __func__, __LINE__);
238 return 0;
239 }
240
241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
243
244 static int bot_send_write_request(struct usbg_cmd *cmd)
245 {
246 struct f_uas *fu = cmd->fu;
247 struct se_cmd *se_cmd = &cmd->se_cmd;
248 struct usb_gadget *gadget = fuas_to_gadget(fu);
249 int ret;
250
251 init_completion(&cmd->write_complete);
252 cmd->fu = fu;
253
254 if (!cmd->data_len) {
255 cmd->csw_code = US_BULK_STAT_PHASE;
256 return -EINVAL;
257 }
258
259 if (!gadget->sg_supported) {
260 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
261 if (!cmd->data_buf)
262 return -ENOMEM;
263
264 fu->bot_req_out->buf = cmd->data_buf;
265 } else {
266 fu->bot_req_out->buf = NULL;
267 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
268 fu->bot_req_out->sg = se_cmd->t_data_sg;
269 }
270
271 fu->bot_req_out->complete = usbg_data_write_cmpl;
272 fu->bot_req_out->length = se_cmd->data_length;
273 fu->bot_req_out->context = cmd;
274
275 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
276 if (ret)
277 goto cleanup;
278 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
279 if (ret)
280 pr_err("%s(%d)\n", __func__, __LINE__);
281
282 wait_for_completion(&cmd->write_complete);
283 target_execute_cmd(se_cmd);
284 cleanup:
285 return ret;
286 }
287
288 static int bot_submit_command(struct f_uas *, void *, unsigned int);
289
290 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
291 {
292 struct f_uas *fu = req->context;
293 int ret;
294
295 fu->flags &= ~USBG_BOT_CMD_PEND;
296
297 if (req->status < 0)
298 return;
299
300 ret = bot_submit_command(fu, req->buf, req->actual);
301 if (ret)
302 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
303 }
304
305 static int bot_prepare_reqs(struct f_uas *fu)
306 {
307 int ret;
308
309 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
310 if (!fu->bot_req_in)
311 goto err;
312
313 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
314 if (!fu->bot_req_out)
315 goto err_out;
316
317 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
318 if (!fu->cmd.req)
319 goto err_cmd;
320
321 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
322 if (!fu->bot_status.req)
323 goto err_sts;
324
325 fu->bot_status.req->buf = &fu->bot_status.csw;
326 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
327 fu->bot_status.req->complete = bot_status_complete;
328 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
329
330 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
331 if (!fu->cmd.buf)
332 goto err_buf;
333
334 fu->cmd.req->complete = bot_cmd_complete;
335 fu->cmd.req->buf = fu->cmd.buf;
336 fu->cmd.req->length = fu->ep_out->maxpacket;
337 fu->cmd.req->context = fu;
338
339 ret = bot_enqueue_cmd_cbw(fu);
340 if (ret)
341 goto err_queue;
342 return 0;
343 err_queue:
344 kfree(fu->cmd.buf);
345 fu->cmd.buf = NULL;
346 err_buf:
347 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
348 err_sts:
349 usb_ep_free_request(fu->ep_out, fu->cmd.req);
350 fu->cmd.req = NULL;
351 err_cmd:
352 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
353 fu->bot_req_out = NULL;
354 err_out:
355 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
356 fu->bot_req_in = NULL;
357 err:
358 pr_err("BOT: endpoint setup failed\n");
359 return -ENOMEM;
360 }
361
362 static void bot_cleanup_old_alt(struct f_uas *fu)
363 {
364 if (!(fu->flags & USBG_ENABLED))
365 return;
366
367 usb_ep_disable(fu->ep_in);
368 usb_ep_disable(fu->ep_out);
369
370 if (!fu->bot_req_in)
371 return;
372
373 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
374 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
375 usb_ep_free_request(fu->ep_out, fu->cmd.req);
376 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
377
378 kfree(fu->cmd.buf);
379
380 fu->bot_req_in = NULL;
381 fu->bot_req_out = NULL;
382 fu->cmd.req = NULL;
383 fu->bot_status.req = NULL;
384 fu->cmd.buf = NULL;
385 }
386
387 static void bot_set_alt(struct f_uas *fu)
388 {
389 struct usb_function *f = &fu->function;
390 struct usb_gadget *gadget = f->config->cdev->gadget;
391 int ret;
392
393 fu->flags = USBG_IS_BOT;
394
395 config_ep_by_speed(gadget, f, fu->ep_in);
396 ret = usb_ep_enable(fu->ep_in);
397 if (ret)
398 goto err_b_in;
399
400 config_ep_by_speed(gadget, f, fu->ep_out);
401 ret = usb_ep_enable(fu->ep_out);
402 if (ret)
403 goto err_b_out;
404
405 ret = bot_prepare_reqs(fu);
406 if (ret)
407 goto err_wq;
408 fu->flags |= USBG_ENABLED;
409 pr_info("Using the BOT protocol\n");
410 return;
411 err_wq:
412 usb_ep_disable(fu->ep_out);
413 err_b_out:
414 usb_ep_disable(fu->ep_in);
415 err_b_in:
416 fu->flags = USBG_IS_BOT;
417 }
418
419 static int usbg_bot_setup(struct usb_function *f,
420 const struct usb_ctrlrequest *ctrl)
421 {
422 struct f_uas *fu = to_f_uas(f);
423 struct usb_composite_dev *cdev = f->config->cdev;
424 u16 w_value = le16_to_cpu(ctrl->wValue);
425 u16 w_length = le16_to_cpu(ctrl->wLength);
426 int luns;
427 u8 *ret_lun;
428
429 switch (ctrl->bRequest) {
430 case US_BULK_GET_MAX_LUN:
431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
432 USB_RECIP_INTERFACE))
433 return -ENOTSUPP;
434
435 if (w_length < 1)
436 return -EINVAL;
437 if (w_value != 0)
438 return -EINVAL;
439 luns = atomic_read(&fu->tpg->tpg_port_count);
440 if (!luns) {
441 pr_err("No LUNs configured?\n");
442 return -EINVAL;
443 }
444 /*
445 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
446 * accessed. The upper limit is 0xf
447 */
448 luns--;
449 if (luns > 0xf) {
450 pr_info_once("Limiting the number of luns to 16\n");
451 luns = 0xf;
452 }
453 ret_lun = cdev->req->buf;
454 *ret_lun = luns;
455 cdev->req->length = 1;
456 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
457
458 case US_BULK_RESET_REQUEST:
459 /* XXX maybe we should remove previous requests for IN + OUT */
460 bot_enqueue_cmd_cbw(fu);
461 return 0;
462 }
463 return -ENOTSUPP;
464 }
465
466 /* Start uas.c code */
467
468 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
469 {
470 /* We have either all three allocated or none */
471 if (!stream->req_in)
472 return;
473
474 usb_ep_free_request(fu->ep_in, stream->req_in);
475 usb_ep_free_request(fu->ep_out, stream->req_out);
476 usb_ep_free_request(fu->ep_status, stream->req_status);
477
478 stream->req_in = NULL;
479 stream->req_out = NULL;
480 stream->req_status = NULL;
481 }
482
483 static void uasp_free_cmdreq(struct f_uas *fu)
484 {
485 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
486 kfree(fu->cmd.buf);
487 fu->cmd.req = NULL;
488 fu->cmd.buf = NULL;
489 }
490
491 static void uasp_cleanup_old_alt(struct f_uas *fu)
492 {
493 int i;
494
495 if (!(fu->flags & USBG_ENABLED))
496 return;
497
498 usb_ep_disable(fu->ep_in);
499 usb_ep_disable(fu->ep_out);
500 usb_ep_disable(fu->ep_status);
501 usb_ep_disable(fu->ep_cmd);
502
503 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
504 uasp_cleanup_one_stream(fu, &fu->stream[i]);
505 uasp_free_cmdreq(fu);
506 }
507
508 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
509
510 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
511 {
512 struct se_cmd *se_cmd = &cmd->se_cmd;
513 struct f_uas *fu = cmd->fu;
514 struct usb_gadget *gadget = fuas_to_gadget(fu);
515 struct uas_stream *stream = cmd->stream;
516
517 if (!gadget->sg_supported) {
518 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
519 if (!cmd->data_buf)
520 return -ENOMEM;
521
522 sg_copy_to_buffer(se_cmd->t_data_sg,
523 se_cmd->t_data_nents,
524 cmd->data_buf,
525 se_cmd->data_length);
526
527 stream->req_in->buf = cmd->data_buf;
528 } else {
529 stream->req_in->buf = NULL;
530 stream->req_in->num_sgs = se_cmd->t_data_nents;
531 stream->req_in->sg = se_cmd->t_data_sg;
532 }
533
534 stream->req_in->complete = uasp_status_data_cmpl;
535 stream->req_in->length = se_cmd->data_length;
536 stream->req_in->context = cmd;
537
538 cmd->state = UASP_SEND_STATUS;
539 return 0;
540 }
541
542 static void uasp_prepare_status(struct usbg_cmd *cmd)
543 {
544 struct se_cmd *se_cmd = &cmd->se_cmd;
545 struct sense_iu *iu = &cmd->sense_iu;
546 struct uas_stream *stream = cmd->stream;
547
548 cmd->state = UASP_QUEUE_COMMAND;
549 iu->iu_id = IU_ID_STATUS;
550 iu->tag = cpu_to_be16(cmd->tag);
551
552 /*
553 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
554 */
555 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
556 iu->status = se_cmd->scsi_status;
557 stream->req_status->context = cmd;
558 stream->req_status->length = se_cmd->scsi_sense_length + 16;
559 stream->req_status->buf = iu;
560 stream->req_status->complete = uasp_status_data_cmpl;
561 }
562
563 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
564 {
565 struct usbg_cmd *cmd = req->context;
566 struct uas_stream *stream = cmd->stream;
567 struct f_uas *fu = cmd->fu;
568 int ret;
569
570 if (req->status < 0)
571 goto cleanup;
572
573 switch (cmd->state) {
574 case UASP_SEND_DATA:
575 ret = uasp_prepare_r_request(cmd);
576 if (ret)
577 goto cleanup;
578 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
579 if (ret)
580 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
581 break;
582
583 case UASP_RECEIVE_DATA:
584 ret = usbg_prepare_w_request(cmd, stream->req_out);
585 if (ret)
586 goto cleanup;
587 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
588 if (ret)
589 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
590 break;
591
592 case UASP_SEND_STATUS:
593 uasp_prepare_status(cmd);
594 ret = usb_ep_queue(fu->ep_status, stream->req_status,
595 GFP_ATOMIC);
596 if (ret)
597 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
598 break;
599
600 case UASP_QUEUE_COMMAND:
601 transport_generic_free_cmd(&cmd->se_cmd, 0);
602 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
603 break;
604
605 default:
606 BUG();
607 }
608 return;
609
610 cleanup:
611 transport_generic_free_cmd(&cmd->se_cmd, 0);
612 }
613
614 static int uasp_send_status_response(struct usbg_cmd *cmd)
615 {
616 struct f_uas *fu = cmd->fu;
617 struct uas_stream *stream = cmd->stream;
618 struct sense_iu *iu = &cmd->sense_iu;
619
620 iu->tag = cpu_to_be16(cmd->tag);
621 stream->req_status->complete = uasp_status_data_cmpl;
622 stream->req_status->context = cmd;
623 cmd->fu = fu;
624 uasp_prepare_status(cmd);
625 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
626 }
627
628 static int uasp_send_read_response(struct usbg_cmd *cmd)
629 {
630 struct f_uas *fu = cmd->fu;
631 struct uas_stream *stream = cmd->stream;
632 struct sense_iu *iu = &cmd->sense_iu;
633 int ret;
634
635 cmd->fu = fu;
636
637 iu->tag = cpu_to_be16(cmd->tag);
638 if (fu->flags & USBG_USE_STREAMS) {
639
640 ret = uasp_prepare_r_request(cmd);
641 if (ret)
642 goto out;
643 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
644 if (ret) {
645 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
646 kfree(cmd->data_buf);
647 cmd->data_buf = NULL;
648 }
649
650 } else {
651
652 iu->iu_id = IU_ID_READ_READY;
653 iu->tag = cpu_to_be16(cmd->tag);
654
655 stream->req_status->complete = uasp_status_data_cmpl;
656 stream->req_status->context = cmd;
657
658 cmd->state = UASP_SEND_DATA;
659 stream->req_status->buf = iu;
660 stream->req_status->length = sizeof(struct iu);
661
662 ret = usb_ep_queue(fu->ep_status, stream->req_status,
663 GFP_ATOMIC);
664 if (ret)
665 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
666 }
667 out:
668 return ret;
669 }
670
671 static int uasp_send_write_request(struct usbg_cmd *cmd)
672 {
673 struct f_uas *fu = cmd->fu;
674 struct se_cmd *se_cmd = &cmd->se_cmd;
675 struct uas_stream *stream = cmd->stream;
676 struct sense_iu *iu = &cmd->sense_iu;
677 int ret;
678
679 init_completion(&cmd->write_complete);
680 cmd->fu = fu;
681
682 iu->tag = cpu_to_be16(cmd->tag);
683
684 if (fu->flags & USBG_USE_STREAMS) {
685
686 ret = usbg_prepare_w_request(cmd, stream->req_out);
687 if (ret)
688 goto cleanup;
689 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
690 if (ret)
691 pr_err("%s(%d)\n", __func__, __LINE__);
692
693 } else {
694
695 iu->iu_id = IU_ID_WRITE_READY;
696 iu->tag = cpu_to_be16(cmd->tag);
697
698 stream->req_status->complete = uasp_status_data_cmpl;
699 stream->req_status->context = cmd;
700
701 cmd->state = UASP_RECEIVE_DATA;
702 stream->req_status->buf = iu;
703 stream->req_status->length = sizeof(struct iu);
704
705 ret = usb_ep_queue(fu->ep_status, stream->req_status,
706 GFP_ATOMIC);
707 if (ret)
708 pr_err("%s(%d)\n", __func__, __LINE__);
709 }
710
711 wait_for_completion(&cmd->write_complete);
712 target_execute_cmd(se_cmd);
713 cleanup:
714 return ret;
715 }
716
717 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
718
719 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
720 {
721 struct f_uas *fu = req->context;
722 int ret;
723
724 if (req->status < 0)
725 return;
726
727 ret = usbg_submit_command(fu, req->buf, req->actual);
728 /*
729 * Once we tune for performance enqueue the command req here again so
730 * we can receive a second command while we processing this one. Pay
731 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
732 * don't break HS.
733 */
734 if (!ret)
735 return;
736 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
737 }
738
739 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
740 {
741 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
742 if (!stream->req_in)
743 goto out;
744
745 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
746 if (!stream->req_out)
747 goto err_out;
748
749 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
750 if (!stream->req_status)
751 goto err_sts;
752
753 return 0;
754 err_sts:
755 usb_ep_free_request(fu->ep_status, stream->req_status);
756 stream->req_status = NULL;
757 err_out:
758 usb_ep_free_request(fu->ep_out, stream->req_out);
759 stream->req_out = NULL;
760 out:
761 return -ENOMEM;
762 }
763
764 static int uasp_alloc_cmd(struct f_uas *fu)
765 {
766 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
767 if (!fu->cmd.req)
768 goto err;
769
770 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
771 if (!fu->cmd.buf)
772 goto err_buf;
773
774 fu->cmd.req->complete = uasp_cmd_complete;
775 fu->cmd.req->buf = fu->cmd.buf;
776 fu->cmd.req->length = fu->ep_cmd->maxpacket;
777 fu->cmd.req->context = fu;
778 return 0;
779
780 err_buf:
781 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
782 err:
783 return -ENOMEM;
784 }
785
786 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
787 {
788 int i;
789
790 for (i = 0; i < max_streams; i++) {
791 struct uas_stream *s = &fu->stream[i];
792
793 s->req_in->stream_id = i + 1;
794 s->req_out->stream_id = i + 1;
795 s->req_status->stream_id = i + 1;
796 }
797 }
798
799 static int uasp_prepare_reqs(struct f_uas *fu)
800 {
801 int ret;
802 int i;
803 int max_streams;
804
805 if (fu->flags & USBG_USE_STREAMS)
806 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
807 else
808 max_streams = 1;
809
810 for (i = 0; i < max_streams; i++) {
811 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
812 if (ret)
813 goto err_cleanup;
814 }
815
816 ret = uasp_alloc_cmd(fu);
817 if (ret)
818 goto err_free_stream;
819 uasp_setup_stream_res(fu, max_streams);
820
821 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
822 if (ret)
823 goto err_free_stream;
824
825 return 0;
826
827 err_free_stream:
828 uasp_free_cmdreq(fu);
829
830 err_cleanup:
831 if (i) {
832 do {
833 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
834 i--;
835 } while (i);
836 }
837 pr_err("UASP: endpoint setup failed\n");
838 return ret;
839 }
840
841 static void uasp_set_alt(struct f_uas *fu)
842 {
843 struct usb_function *f = &fu->function;
844 struct usb_gadget *gadget = f->config->cdev->gadget;
845 int ret;
846
847 fu->flags = USBG_IS_UAS;
848
849 if (gadget->speed == USB_SPEED_SUPER)
850 fu->flags |= USBG_USE_STREAMS;
851
852 config_ep_by_speed(gadget, f, fu->ep_in);
853 ret = usb_ep_enable(fu->ep_in);
854 if (ret)
855 goto err_b_in;
856
857 config_ep_by_speed(gadget, f, fu->ep_out);
858 ret = usb_ep_enable(fu->ep_out);
859 if (ret)
860 goto err_b_out;
861
862 config_ep_by_speed(gadget, f, fu->ep_cmd);
863 ret = usb_ep_enable(fu->ep_cmd);
864 if (ret)
865 goto err_cmd;
866 config_ep_by_speed(gadget, f, fu->ep_status);
867 ret = usb_ep_enable(fu->ep_status);
868 if (ret)
869 goto err_status;
870
871 ret = uasp_prepare_reqs(fu);
872 if (ret)
873 goto err_wq;
874 fu->flags |= USBG_ENABLED;
875
876 pr_info("Using the UAS protocol\n");
877 return;
878 err_wq:
879 usb_ep_disable(fu->ep_status);
880 err_status:
881 usb_ep_disable(fu->ep_cmd);
882 err_cmd:
883 usb_ep_disable(fu->ep_out);
884 err_b_out:
885 usb_ep_disable(fu->ep_in);
886 err_b_in:
887 fu->flags = 0;
888 }
889
890 static int get_cmd_dir(const unsigned char *cdb)
891 {
892 int ret;
893
894 switch (cdb[0]) {
895 case READ_6:
896 case READ_10:
897 case READ_12:
898 case READ_16:
899 case INQUIRY:
900 case MODE_SENSE:
901 case MODE_SENSE_10:
902 case SERVICE_ACTION_IN_16:
903 case MAINTENANCE_IN:
904 case PERSISTENT_RESERVE_IN:
905 case SECURITY_PROTOCOL_IN:
906 case ACCESS_CONTROL_IN:
907 case REPORT_LUNS:
908 case READ_BLOCK_LIMITS:
909 case READ_POSITION:
910 case READ_CAPACITY:
911 case READ_TOC:
912 case READ_FORMAT_CAPACITIES:
913 case REQUEST_SENSE:
914 ret = DMA_FROM_DEVICE;
915 break;
916
917 case WRITE_6:
918 case WRITE_10:
919 case WRITE_12:
920 case WRITE_16:
921 case MODE_SELECT:
922 case MODE_SELECT_10:
923 case WRITE_VERIFY:
924 case WRITE_VERIFY_12:
925 case PERSISTENT_RESERVE_OUT:
926 case MAINTENANCE_OUT:
927 case SECURITY_PROTOCOL_OUT:
928 case ACCESS_CONTROL_OUT:
929 ret = DMA_TO_DEVICE;
930 break;
931 case ALLOW_MEDIUM_REMOVAL:
932 case TEST_UNIT_READY:
933 case SYNCHRONIZE_CACHE:
934 case START_STOP:
935 case ERASE:
936 case REZERO_UNIT:
937 case SEEK_10:
938 case SPACE:
939 case VERIFY:
940 case WRITE_FILEMARKS:
941 ret = DMA_NONE;
942 break;
943 default:
944 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
945 pr_warn(CMD_DIR_MSG, cdb[0]);
946 #undef CMD_DIR_MSG
947 ret = -EINVAL;
948 }
949 return ret;
950 }
951
952 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
953 {
954 struct usbg_cmd *cmd = req->context;
955 struct se_cmd *se_cmd = &cmd->se_cmd;
956
957 if (req->status < 0) {
958 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
959 goto cleanup;
960 }
961
962 if (req->num_sgs == 0) {
963 sg_copy_from_buffer(se_cmd->t_data_sg,
964 se_cmd->t_data_nents,
965 cmd->data_buf,
966 se_cmd->data_length);
967 }
968
969 complete(&cmd->write_complete);
970 return;
971
972 cleanup:
973 transport_generic_free_cmd(&cmd->se_cmd, 0);
974 }
975
976 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
977 {
978 struct se_cmd *se_cmd = &cmd->se_cmd;
979 struct f_uas *fu = cmd->fu;
980 struct usb_gadget *gadget = fuas_to_gadget(fu);
981
982 if (!gadget->sg_supported) {
983 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
984 if (!cmd->data_buf)
985 return -ENOMEM;
986
987 req->buf = cmd->data_buf;
988 } else {
989 req->buf = NULL;
990 req->num_sgs = se_cmd->t_data_nents;
991 req->sg = se_cmd->t_data_sg;
992 }
993
994 req->complete = usbg_data_write_cmpl;
995 req->length = se_cmd->data_length;
996 req->context = cmd;
997 return 0;
998 }
999
1000 static int usbg_send_status_response(struct se_cmd *se_cmd)
1001 {
1002 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1003 se_cmd);
1004 struct f_uas *fu = cmd->fu;
1005
1006 if (fu->flags & USBG_IS_BOT)
1007 return bot_send_status_response(cmd);
1008 else
1009 return uasp_send_status_response(cmd);
1010 }
1011
1012 static int usbg_send_write_request(struct se_cmd *se_cmd)
1013 {
1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015 se_cmd);
1016 struct f_uas *fu = cmd->fu;
1017
1018 if (fu->flags & USBG_IS_BOT)
1019 return bot_send_write_request(cmd);
1020 else
1021 return uasp_send_write_request(cmd);
1022 }
1023
1024 static int usbg_send_read_response(struct se_cmd *se_cmd)
1025 {
1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027 se_cmd);
1028 struct f_uas *fu = cmd->fu;
1029
1030 if (fu->flags & USBG_IS_BOT)
1031 return bot_send_read_response(cmd);
1032 else
1033 return uasp_send_read_response(cmd);
1034 }
1035
1036 static void usbg_cmd_work(struct work_struct *work)
1037 {
1038 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1039 struct se_cmd *se_cmd;
1040 struct tcm_usbg_nexus *tv_nexus;
1041 struct usbg_tpg *tpg;
1042 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1043
1044 se_cmd = &cmd->se_cmd;
1045 tpg = cmd->fu->tpg;
1046 tv_nexus = tpg->tpg_nexus;
1047 dir = get_cmd_dir(cmd->cmd_buf);
1048 if (dir < 0) {
1049 transport_init_se_cmd(se_cmd,
1050 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1051 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1052 cmd->prio_attr, cmd->sense_iu.sense);
1053 goto out;
1054 }
1055
1056 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1057 cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1058 cmd->prio_attr, dir, flags) < 0)
1059 goto out;
1060
1061 return;
1062
1063 out:
1064 transport_send_check_condition_and_sense(se_cmd,
1065 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1066 transport_generic_free_cmd(&cmd->se_cmd, 0);
1067 }
1068
1069 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1070 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1071 {
1072 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1073 struct usbg_cmd *cmd;
1074 int tag;
1075
1076 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
1077 if (tag < 0)
1078 return ERR_PTR(-ENOMEM);
1079
1080 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1081 memset(cmd, 0, sizeof(*cmd));
1082 cmd->se_cmd.map_tag = tag;
1083 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1084 cmd->fu = fu;
1085
1086 return cmd;
1087 }
1088
1089 static void usbg_release_cmd(struct se_cmd *);
1090
1091 static int usbg_submit_command(struct f_uas *fu,
1092 void *cmdbuf, unsigned int len)
1093 {
1094 struct command_iu *cmd_iu = cmdbuf;
1095 struct usbg_cmd *cmd;
1096 struct usbg_tpg *tpg = fu->tpg;
1097 struct tcm_usbg_nexus *tv_nexus = tpg->tpg_nexus;
1098 u32 cmd_len;
1099 u16 scsi_tag;
1100
1101 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1102 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1103 return -EINVAL;
1104 }
1105
1106 tv_nexus = tpg->tpg_nexus;
1107 if (!tv_nexus) {
1108 pr_err("Missing nexus, ignoring command\n");
1109 return -EINVAL;
1110 }
1111
1112 cmd_len = (cmd_iu->len & ~0x3) + 16;
1113 if (cmd_len > USBG_MAX_CMD)
1114 return -EINVAL;
1115
1116 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1117 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1118 if (IS_ERR(cmd)) {
1119 pr_err("usbg_get_cmd failed\n");
1120 return -ENOMEM;
1121 }
1122 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1123
1124 if (fu->flags & USBG_USE_STREAMS) {
1125 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1126 goto err;
1127 if (!cmd->tag)
1128 cmd->stream = &fu->stream[0];
1129 else
1130 cmd->stream = &fu->stream[cmd->tag - 1];
1131 } else {
1132 cmd->stream = &fu->stream[0];
1133 }
1134
1135 switch (cmd_iu->prio_attr & 0x7) {
1136 case UAS_HEAD_TAG:
1137 cmd->prio_attr = TCM_HEAD_TAG;
1138 break;
1139 case UAS_ORDERED_TAG:
1140 cmd->prio_attr = TCM_ORDERED_TAG;
1141 break;
1142 case UAS_ACA:
1143 cmd->prio_attr = TCM_ACA_TAG;
1144 break;
1145 default:
1146 pr_debug_once("Unsupported prio_attr: %02x.\n",
1147 cmd_iu->prio_attr);
1148 /* fall through */
1149 case UAS_SIMPLE_TAG:
1150 cmd->prio_attr = TCM_SIMPLE_TAG;
1151 break;
1152 }
1153
1154 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1155
1156 INIT_WORK(&cmd->work, usbg_cmd_work);
1157 queue_work(tpg->workqueue, &cmd->work);
1158
1159 return 0;
1160 err:
1161 usbg_release_cmd(&cmd->se_cmd);
1162 return -EINVAL;
1163 }
1164
1165 static void bot_cmd_work(struct work_struct *work)
1166 {
1167 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1168 struct se_cmd *se_cmd;
1169 struct tcm_usbg_nexus *tv_nexus;
1170 struct usbg_tpg *tpg;
1171 int dir;
1172
1173 se_cmd = &cmd->se_cmd;
1174 tpg = cmd->fu->tpg;
1175 tv_nexus = tpg->tpg_nexus;
1176 dir = get_cmd_dir(cmd->cmd_buf);
1177 if (dir < 0) {
1178 transport_init_se_cmd(se_cmd,
1179 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1180 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1181 cmd->prio_attr, cmd->sense_iu.sense);
1182 goto out;
1183 }
1184
1185 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1186 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1187 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1188 goto out;
1189
1190 return;
1191
1192 out:
1193 transport_send_check_condition_and_sense(se_cmd,
1194 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1195 transport_generic_free_cmd(&cmd->se_cmd, 0);
1196 }
1197
1198 static int bot_submit_command(struct f_uas *fu,
1199 void *cmdbuf, unsigned int len)
1200 {
1201 struct bulk_cb_wrap *cbw = cmdbuf;
1202 struct usbg_cmd *cmd;
1203 struct usbg_tpg *tpg = fu->tpg;
1204 struct tcm_usbg_nexus *tv_nexus;
1205 u32 cmd_len;
1206
1207 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1208 pr_err("Wrong signature on CBW\n");
1209 return -EINVAL;
1210 }
1211 if (len != 31) {
1212 pr_err("Wrong length for CBW\n");
1213 return -EINVAL;
1214 }
1215
1216 cmd_len = cbw->Length;
1217 if (cmd_len < 1 || cmd_len > 16)
1218 return -EINVAL;
1219
1220 tv_nexus = tpg->tpg_nexus;
1221 if (!tv_nexus) {
1222 pr_err("Missing nexus, ignoring command\n");
1223 return -ENODEV;
1224 }
1225
1226 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1227 if (IS_ERR(cmd)) {
1228 pr_err("usbg_get_cmd failed\n");
1229 return -ENOMEM;
1230 }
1231 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1232
1233 cmd->bot_tag = cbw->Tag;
1234 cmd->prio_attr = TCM_SIMPLE_TAG;
1235 cmd->unpacked_lun = cbw->Lun;
1236 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1237 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1238 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1239
1240 INIT_WORK(&cmd->work, bot_cmd_work);
1241 queue_work(tpg->workqueue, &cmd->work);
1242
1243 return 0;
1244 }
1245
1246 /* Start fabric.c code */
1247
1248 static int usbg_check_true(struct se_portal_group *se_tpg)
1249 {
1250 return 1;
1251 }
1252
1253 static int usbg_check_false(struct se_portal_group *se_tpg)
1254 {
1255 return 0;
1256 }
1257
1258 static char *usbg_get_fabric_name(void)
1259 {
1260 return "usb_gadget";
1261 }
1262
1263 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1264 {
1265 struct usbg_tpg *tpg = container_of(se_tpg,
1266 struct usbg_tpg, se_tpg);
1267 struct usbg_tport *tport = tpg->tport;
1268
1269 return &tport->tport_name[0];
1270 }
1271
1272 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1273 {
1274 struct usbg_tpg *tpg = container_of(se_tpg,
1275 struct usbg_tpg, se_tpg);
1276 return tpg->tport_tpgt;
1277 }
1278
1279 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1280 {
1281 return 1;
1282 }
1283
1284 static void usbg_release_cmd(struct se_cmd *se_cmd)
1285 {
1286 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1287 se_cmd);
1288 struct se_session *se_sess = se_cmd->se_sess;
1289
1290 kfree(cmd->data_buf);
1291 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
1292 }
1293
1294 static u32 usbg_sess_get_index(struct se_session *se_sess)
1295 {
1296 return 0;
1297 }
1298
1299 /*
1300 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1301 */
1302 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1303 {
1304 return 0;
1305 }
1306
1307 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1308 {
1309 }
1310
1311 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1312 {
1313 return 0;
1314 }
1315
1316 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1317 {
1318 }
1319
1320 static void usbg_aborted_task(struct se_cmd *se_cmd)
1321 {
1322 }
1323
1324 static const char *usbg_check_wwn(const char *name)
1325 {
1326 const char *n;
1327 unsigned int len;
1328
1329 n = strstr(name, "naa.");
1330 if (!n)
1331 return NULL;
1332 n += 4;
1333 len = strlen(n);
1334 if (len == 0 || len > USBG_NAMELEN - 1)
1335 return NULL;
1336 return n;
1337 }
1338
1339 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1340 {
1341 if (!usbg_check_wwn(name))
1342 return -EINVAL;
1343 return 0;
1344 }
1345
1346 static struct se_portal_group *usbg_make_tpg(
1347 struct se_wwn *wwn,
1348 struct config_group *group,
1349 const char *name)
1350 {
1351 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1352 tport_wwn);
1353 struct usbg_tpg *tpg;
1354 unsigned long tpgt;
1355 int ret;
1356 struct f_tcm_opts *opts;
1357 unsigned i;
1358
1359 if (strstr(name, "tpgt_") != name)
1360 return ERR_PTR(-EINVAL);
1361 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1362 return ERR_PTR(-EINVAL);
1363 ret = -ENODEV;
1364 mutex_lock(&tpg_instances_lock);
1365 for (i = 0; i < TPG_INSTANCES; ++i)
1366 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1367 break;
1368 if (i == TPG_INSTANCES)
1369 goto unlock_inst;
1370
1371 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1372 func_inst);
1373 mutex_lock(&opts->dep_lock);
1374 if (!opts->ready)
1375 goto unlock_dep;
1376
1377 if (opts->has_dep) {
1378 if (!try_module_get(opts->dependent))
1379 goto unlock_dep;
1380 } else {
1381 ret = configfs_depend_item_unlocked(
1382 group->cg_subsys,
1383 &opts->func_inst.group.cg_item);
1384 if (ret)
1385 goto unlock_dep;
1386 }
1387
1388 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1389 ret = -ENOMEM;
1390 if (!tpg)
1391 goto unref_dep;
1392 mutex_init(&tpg->tpg_mutex);
1393 atomic_set(&tpg->tpg_port_count, 0);
1394 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1395 if (!tpg->workqueue)
1396 goto free_tpg;
1397
1398 tpg->tport = tport;
1399 tpg->tport_tpgt = tpgt;
1400
1401 /*
1402 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1403 * pretend to be SAS..
1404 */
1405 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1406 if (ret < 0)
1407 goto free_workqueue;
1408
1409 tpg_instances[i].tpg = tpg;
1410 tpg->fi = tpg_instances[i].func_inst;
1411 mutex_unlock(&opts->dep_lock);
1412 mutex_unlock(&tpg_instances_lock);
1413 return &tpg->se_tpg;
1414
1415 free_workqueue:
1416 destroy_workqueue(tpg->workqueue);
1417 free_tpg:
1418 kfree(tpg);
1419 unref_dep:
1420 if (opts->has_dep)
1421 module_put(opts->dependent);
1422 else
1423 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1424 unlock_dep:
1425 mutex_unlock(&opts->dep_lock);
1426 unlock_inst:
1427 mutex_unlock(&tpg_instances_lock);
1428
1429 return ERR_PTR(ret);
1430 }
1431
1432 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1433
1434 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1435 {
1436 struct usbg_tpg *tpg = container_of(se_tpg,
1437 struct usbg_tpg, se_tpg);
1438 unsigned i;
1439 struct f_tcm_opts *opts;
1440
1441 tcm_usbg_drop_nexus(tpg);
1442 core_tpg_deregister(se_tpg);
1443 destroy_workqueue(tpg->workqueue);
1444
1445 mutex_lock(&tpg_instances_lock);
1446 for (i = 0; i < TPG_INSTANCES; ++i)
1447 if (tpg_instances[i].tpg == tpg)
1448 break;
1449 if (i < TPG_INSTANCES) {
1450 tpg_instances[i].tpg = NULL;
1451 opts = container_of(tpg_instances[i].func_inst,
1452 struct f_tcm_opts, func_inst);
1453 mutex_lock(&opts->dep_lock);
1454 if (opts->has_dep)
1455 module_put(opts->dependent);
1456 else
1457 configfs_undepend_item_unlocked(
1458 &opts->func_inst.group.cg_item);
1459 mutex_unlock(&opts->dep_lock);
1460 }
1461 mutex_unlock(&tpg_instances_lock);
1462
1463 kfree(tpg);
1464 }
1465
1466 static struct se_wwn *usbg_make_tport(
1467 struct target_fabric_configfs *tf,
1468 struct config_group *group,
1469 const char *name)
1470 {
1471 struct usbg_tport *tport;
1472 const char *wnn_name;
1473 u64 wwpn = 0;
1474
1475 wnn_name = usbg_check_wwn(name);
1476 if (!wnn_name)
1477 return ERR_PTR(-EINVAL);
1478
1479 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1480 if (!(tport))
1481 return ERR_PTR(-ENOMEM);
1482
1483 tport->tport_wwpn = wwpn;
1484 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1485 return &tport->tport_wwn;
1486 }
1487
1488 static void usbg_drop_tport(struct se_wwn *wwn)
1489 {
1490 struct usbg_tport *tport = container_of(wwn,
1491 struct usbg_tport, tport_wwn);
1492 kfree(tport);
1493 }
1494
1495 /*
1496 * If somebody feels like dropping the version property, go ahead.
1497 */
1498 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1499 {
1500 return sprintf(page, "usb-gadget fabric module\n");
1501 }
1502
1503 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1504
1505 static struct configfs_attribute *usbg_wwn_attrs[] = {
1506 &usbg_wwn_attr_version,
1507 NULL,
1508 };
1509
1510 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1511 {
1512 struct se_portal_group *se_tpg = to_tpg(item);
1513 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1514
1515 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1516 }
1517
1518 static int usbg_attach(struct usbg_tpg *);
1519 static void usbg_detach(struct usbg_tpg *);
1520
1521 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1522 const char *page, size_t count)
1523 {
1524 struct se_portal_group *se_tpg = to_tpg(item);
1525 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1526 bool op;
1527 ssize_t ret;
1528
1529 ret = strtobool(page, &op);
1530 if (ret)
1531 return ret;
1532
1533 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1534 return -EINVAL;
1535
1536 if (op)
1537 ret = usbg_attach(tpg);
1538 else
1539 usbg_detach(tpg);
1540 if (ret)
1541 return ret;
1542
1543 tpg->gadget_connect = op;
1544
1545 return count;
1546 }
1547
1548 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1549 {
1550 struct se_portal_group *se_tpg = to_tpg(item);
1551 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1552 struct tcm_usbg_nexus *tv_nexus;
1553 ssize_t ret;
1554
1555 mutex_lock(&tpg->tpg_mutex);
1556 tv_nexus = tpg->tpg_nexus;
1557 if (!tv_nexus) {
1558 ret = -ENODEV;
1559 goto out;
1560 }
1561 ret = snprintf(page, PAGE_SIZE, "%s\n",
1562 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1563 out:
1564 mutex_unlock(&tpg->tpg_mutex);
1565 return ret;
1566 }
1567
1568 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1569 struct se_session *se_sess, void *p)
1570 {
1571 struct usbg_tpg *tpg = container_of(se_tpg,
1572 struct usbg_tpg, se_tpg);
1573
1574 tpg->tpg_nexus = p;
1575 return 0;
1576 }
1577
1578 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1579 {
1580 struct tcm_usbg_nexus *tv_nexus;
1581 int ret = 0;
1582
1583 mutex_lock(&tpg->tpg_mutex);
1584 if (tpg->tpg_nexus) {
1585 ret = -EEXIST;
1586 pr_debug("tpg->tpg_nexus already exists\n");
1587 goto out_unlock;
1588 }
1589
1590 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1591 if (!tv_nexus) {
1592 ret = -ENOMEM;
1593 goto out_unlock;
1594 }
1595
1596 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1597 USB_G_DEFAULT_SESSION_TAGS,
1598 sizeof(struct usbg_cmd),
1599 TARGET_PROT_NORMAL, name,
1600 tv_nexus, usbg_alloc_sess_cb);
1601 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1602 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1603 pr_debug(MAKE_NEXUS_MSG, name);
1604 #undef MAKE_NEXUS_MSG
1605 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1606 kfree(tv_nexus);
1607 }
1608
1609 out_unlock:
1610 mutex_unlock(&tpg->tpg_mutex);
1611 return ret;
1612 }
1613
1614 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1615 {
1616 struct se_session *se_sess;
1617 struct tcm_usbg_nexus *tv_nexus;
1618 int ret = -ENODEV;
1619
1620 mutex_lock(&tpg->tpg_mutex);
1621 tv_nexus = tpg->tpg_nexus;
1622 if (!tv_nexus)
1623 goto out;
1624
1625 se_sess = tv_nexus->tvn_se_sess;
1626 if (!se_sess)
1627 goto out;
1628
1629 if (atomic_read(&tpg->tpg_port_count)) {
1630 ret = -EPERM;
1631 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1632 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1633 #undef MSG
1634 goto out;
1635 }
1636
1637 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1638 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1639 /*
1640 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1641 */
1642 transport_deregister_session(tv_nexus->tvn_se_sess);
1643 tpg->tpg_nexus = NULL;
1644
1645 kfree(tv_nexus);
1646 ret = 0;
1647 out:
1648 mutex_unlock(&tpg->tpg_mutex);
1649 return ret;
1650 }
1651
1652 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1653 const char *page, size_t count)
1654 {
1655 struct se_portal_group *se_tpg = to_tpg(item);
1656 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1657 unsigned char i_port[USBG_NAMELEN], *ptr;
1658 int ret;
1659
1660 if (!strncmp(page, "NULL", 4)) {
1661 ret = tcm_usbg_drop_nexus(tpg);
1662 return (!ret) ? count : ret;
1663 }
1664 if (strlen(page) >= USBG_NAMELEN) {
1665
1666 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1667 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1668 #undef NEXUS_STORE_MSG
1669 return -EINVAL;
1670 }
1671 snprintf(i_port, USBG_NAMELEN, "%s", page);
1672
1673 ptr = strstr(i_port, "naa.");
1674 if (!ptr) {
1675 pr_err("Missing 'naa.' prefix\n");
1676 return -EINVAL;
1677 }
1678
1679 if (i_port[strlen(i_port) - 1] == '\n')
1680 i_port[strlen(i_port) - 1] = '\0';
1681
1682 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1683 if (ret < 0)
1684 return ret;
1685 return count;
1686 }
1687
1688 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1689 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1690
1691 static struct configfs_attribute *usbg_base_attrs[] = {
1692 &tcm_usbg_tpg_attr_enable,
1693 &tcm_usbg_tpg_attr_nexus,
1694 NULL,
1695 };
1696
1697 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1698 {
1699 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1700
1701 atomic_inc(&tpg->tpg_port_count);
1702 smp_mb__after_atomic();
1703 return 0;
1704 }
1705
1706 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1707 struct se_lun *se_lun)
1708 {
1709 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1710
1711 atomic_dec(&tpg->tpg_port_count);
1712 smp_mb__after_atomic();
1713 }
1714
1715 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1716 {
1717 return target_put_sess_cmd(se_cmd);
1718 }
1719
1720 static const struct target_core_fabric_ops usbg_ops = {
1721 .module = THIS_MODULE,
1722 .name = "usb_gadget",
1723 .get_fabric_name = usbg_get_fabric_name,
1724 .tpg_get_wwn = usbg_get_fabric_wwn,
1725 .tpg_get_tag = usbg_get_tag,
1726 .tpg_check_demo_mode = usbg_check_true,
1727 .tpg_check_demo_mode_cache = usbg_check_false,
1728 .tpg_check_demo_mode_write_protect = usbg_check_false,
1729 .tpg_check_prod_mode_write_protect = usbg_check_false,
1730 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1731 .release_cmd = usbg_release_cmd,
1732 .sess_get_index = usbg_sess_get_index,
1733 .sess_get_initiator_sid = NULL,
1734 .write_pending = usbg_send_write_request,
1735 .write_pending_status = usbg_write_pending_status,
1736 .set_default_node_attributes = usbg_set_default_node_attrs,
1737 .get_cmd_state = usbg_get_cmd_state,
1738 .queue_data_in = usbg_send_read_response,
1739 .queue_status = usbg_send_status_response,
1740 .queue_tm_rsp = usbg_queue_tm_rsp,
1741 .aborted_task = usbg_aborted_task,
1742 .check_stop_free = usbg_check_stop_free,
1743
1744 .fabric_make_wwn = usbg_make_tport,
1745 .fabric_drop_wwn = usbg_drop_tport,
1746 .fabric_make_tpg = usbg_make_tpg,
1747 .fabric_drop_tpg = usbg_drop_tpg,
1748 .fabric_post_link = usbg_port_link,
1749 .fabric_pre_unlink = usbg_port_unlink,
1750 .fabric_init_nodeacl = usbg_init_nodeacl,
1751
1752 .tfc_wwn_attrs = usbg_wwn_attrs,
1753 .tfc_tpg_base_attrs = usbg_base_attrs,
1754 };
1755
1756 /* Start gadget.c code */
1757
1758 static struct usb_interface_descriptor bot_intf_desc = {
1759 .bLength = sizeof(bot_intf_desc),
1760 .bDescriptorType = USB_DT_INTERFACE,
1761 .bNumEndpoints = 2,
1762 .bAlternateSetting = USB_G_ALT_INT_BBB,
1763 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1764 .bInterfaceSubClass = USB_SC_SCSI,
1765 .bInterfaceProtocol = USB_PR_BULK,
1766 };
1767
1768 static struct usb_interface_descriptor uasp_intf_desc = {
1769 .bLength = sizeof(uasp_intf_desc),
1770 .bDescriptorType = USB_DT_INTERFACE,
1771 .bNumEndpoints = 4,
1772 .bAlternateSetting = USB_G_ALT_INT_UAS,
1773 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1774 .bInterfaceSubClass = USB_SC_SCSI,
1775 .bInterfaceProtocol = USB_PR_UAS,
1776 };
1777
1778 static struct usb_endpoint_descriptor uasp_bi_desc = {
1779 .bLength = USB_DT_ENDPOINT_SIZE,
1780 .bDescriptorType = USB_DT_ENDPOINT,
1781 .bEndpointAddress = USB_DIR_IN,
1782 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1783 .wMaxPacketSize = cpu_to_le16(512),
1784 };
1785
1786 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1787 .bLength = USB_DT_ENDPOINT_SIZE,
1788 .bDescriptorType = USB_DT_ENDPOINT,
1789 .bEndpointAddress = USB_DIR_IN,
1790 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1791 };
1792
1793 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1794 .bLength = sizeof(uasp_bi_pipe_desc),
1795 .bDescriptorType = USB_DT_PIPE_USAGE,
1796 .bPipeID = DATA_IN_PIPE_ID,
1797 };
1798
1799 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1800 .bLength = USB_DT_ENDPOINT_SIZE,
1801 .bDescriptorType = USB_DT_ENDPOINT,
1802 .bEndpointAddress = USB_DIR_IN,
1803 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1804 .wMaxPacketSize = cpu_to_le16(1024),
1805 };
1806
1807 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1808 .bLength = sizeof(uasp_bi_ep_comp_desc),
1809 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1810 .bMaxBurst = 0,
1811 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1812 .wBytesPerInterval = 0,
1813 };
1814
1815 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1816 .bLength = sizeof(bot_bi_ep_comp_desc),
1817 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1818 .bMaxBurst = 0,
1819 };
1820
1821 static struct usb_endpoint_descriptor uasp_bo_desc = {
1822 .bLength = USB_DT_ENDPOINT_SIZE,
1823 .bDescriptorType = USB_DT_ENDPOINT,
1824 .bEndpointAddress = USB_DIR_OUT,
1825 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1826 .wMaxPacketSize = cpu_to_le16(512),
1827 };
1828
1829 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1830 .bLength = USB_DT_ENDPOINT_SIZE,
1831 .bDescriptorType = USB_DT_ENDPOINT,
1832 .bEndpointAddress = USB_DIR_OUT,
1833 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1834 };
1835
1836 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1837 .bLength = sizeof(uasp_bo_pipe_desc),
1838 .bDescriptorType = USB_DT_PIPE_USAGE,
1839 .bPipeID = DATA_OUT_PIPE_ID,
1840 };
1841
1842 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1843 .bLength = USB_DT_ENDPOINT_SIZE,
1844 .bDescriptorType = USB_DT_ENDPOINT,
1845 .bEndpointAddress = USB_DIR_OUT,
1846 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1847 .wMaxPacketSize = cpu_to_le16(0x400),
1848 };
1849
1850 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1851 .bLength = sizeof(uasp_bo_ep_comp_desc),
1852 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1853 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1854 };
1855
1856 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1857 .bLength = sizeof(bot_bo_ep_comp_desc),
1858 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1859 };
1860
1861 static struct usb_endpoint_descriptor uasp_status_desc = {
1862 .bLength = USB_DT_ENDPOINT_SIZE,
1863 .bDescriptorType = USB_DT_ENDPOINT,
1864 .bEndpointAddress = USB_DIR_IN,
1865 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1866 .wMaxPacketSize = cpu_to_le16(512),
1867 };
1868
1869 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1870 .bLength = USB_DT_ENDPOINT_SIZE,
1871 .bDescriptorType = USB_DT_ENDPOINT,
1872 .bEndpointAddress = USB_DIR_IN,
1873 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1874 };
1875
1876 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1877 .bLength = sizeof(uasp_status_pipe_desc),
1878 .bDescriptorType = USB_DT_PIPE_USAGE,
1879 .bPipeID = STATUS_PIPE_ID,
1880 };
1881
1882 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1883 .bLength = USB_DT_ENDPOINT_SIZE,
1884 .bDescriptorType = USB_DT_ENDPOINT,
1885 .bEndpointAddress = USB_DIR_IN,
1886 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1887 .wMaxPacketSize = cpu_to_le16(1024),
1888 };
1889
1890 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1891 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1892 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1893 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1894 };
1895
1896 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1897 .bLength = USB_DT_ENDPOINT_SIZE,
1898 .bDescriptorType = USB_DT_ENDPOINT,
1899 .bEndpointAddress = USB_DIR_OUT,
1900 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1901 .wMaxPacketSize = cpu_to_le16(512),
1902 };
1903
1904 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1905 .bLength = USB_DT_ENDPOINT_SIZE,
1906 .bDescriptorType = USB_DT_ENDPOINT,
1907 .bEndpointAddress = USB_DIR_OUT,
1908 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1909 };
1910
1911 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1912 .bLength = sizeof(uasp_cmd_pipe_desc),
1913 .bDescriptorType = USB_DT_PIPE_USAGE,
1914 .bPipeID = CMD_PIPE_ID,
1915 };
1916
1917 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1918 .bLength = USB_DT_ENDPOINT_SIZE,
1919 .bDescriptorType = USB_DT_ENDPOINT,
1920 .bEndpointAddress = USB_DIR_OUT,
1921 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1922 .wMaxPacketSize = cpu_to_le16(1024),
1923 };
1924
1925 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1926 .bLength = sizeof(uasp_cmd_comp_desc),
1927 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1928 };
1929
1930 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1931 (struct usb_descriptor_header *) &bot_intf_desc,
1932 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1933 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1934
1935 (struct usb_descriptor_header *) &uasp_intf_desc,
1936 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1937 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1938 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1939 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1940 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1941 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1942 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1943 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1944 NULL,
1945 };
1946
1947 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1948 (struct usb_descriptor_header *) &bot_intf_desc,
1949 (struct usb_descriptor_header *) &uasp_bi_desc,
1950 (struct usb_descriptor_header *) &uasp_bo_desc,
1951
1952 (struct usb_descriptor_header *) &uasp_intf_desc,
1953 (struct usb_descriptor_header *) &uasp_bi_desc,
1954 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1955 (struct usb_descriptor_header *) &uasp_bo_desc,
1956 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1957 (struct usb_descriptor_header *) &uasp_status_desc,
1958 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1959 (struct usb_descriptor_header *) &uasp_cmd_desc,
1960 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1961 NULL,
1962 };
1963
1964 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1965 (struct usb_descriptor_header *) &bot_intf_desc,
1966 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1967 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1968 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1969 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1970
1971 (struct usb_descriptor_header *) &uasp_intf_desc,
1972 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1973 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1974 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1975 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1976 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1977 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1978 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1979 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1980 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1981 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1982 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1983 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1984 NULL,
1985 };
1986
1987 static struct usb_string tcm_us_strings[] = {
1988 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1989 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1990 { },
1991 };
1992
1993 static struct usb_gadget_strings tcm_stringtab = {
1994 .language = 0x0409,
1995 .strings = tcm_us_strings,
1996 };
1997
1998 static struct usb_gadget_strings *tcm_strings[] = {
1999 &tcm_stringtab,
2000 NULL,
2001 };
2002
2003 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
2004 {
2005 struct f_uas *fu = to_f_uas(f);
2006 struct usb_string *us;
2007 struct usb_gadget *gadget = c->cdev->gadget;
2008 struct usb_ep *ep;
2009 struct f_tcm_opts *opts;
2010 int iface;
2011 int ret;
2012
2013 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2014
2015 mutex_lock(&opts->dep_lock);
2016 if (!opts->can_attach) {
2017 mutex_unlock(&opts->dep_lock);
2018 return -ENODEV;
2019 }
2020 mutex_unlock(&opts->dep_lock);
2021 us = usb_gstrings_attach(c->cdev, tcm_strings,
2022 ARRAY_SIZE(tcm_us_strings));
2023 if (IS_ERR(us))
2024 return PTR_ERR(us);
2025 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2026 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2027
2028 iface = usb_interface_id(c, f);
2029 if (iface < 0)
2030 return iface;
2031
2032 bot_intf_desc.bInterfaceNumber = iface;
2033 uasp_intf_desc.bInterfaceNumber = iface;
2034 fu->iface = iface;
2035 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2036 &uasp_bi_ep_comp_desc);
2037 if (!ep)
2038 goto ep_fail;
2039
2040 fu->ep_in = ep;
2041
2042 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2043 &uasp_bo_ep_comp_desc);
2044 if (!ep)
2045 goto ep_fail;
2046 fu->ep_out = ep;
2047
2048 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2049 &uasp_status_in_ep_comp_desc);
2050 if (!ep)
2051 goto ep_fail;
2052 fu->ep_status = ep;
2053
2054 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2055 &uasp_cmd_comp_desc);
2056 if (!ep)
2057 goto ep_fail;
2058 fu->ep_cmd = ep;
2059
2060 /* Assume endpoint addresses are the same for both speeds */
2061 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2062 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2063 uasp_status_desc.bEndpointAddress =
2064 uasp_ss_status_desc.bEndpointAddress;
2065 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2066
2067 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2068 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2069 uasp_fs_status_desc.bEndpointAddress =
2070 uasp_ss_status_desc.bEndpointAddress;
2071 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2072
2073 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2074 uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2075 if (ret)
2076 goto ep_fail;
2077
2078 return 0;
2079 ep_fail:
2080 pr_err("Can't claim all required eps\n");
2081
2082 return -ENOTSUPP;
2083 }
2084
2085 struct guas_setup_wq {
2086 struct work_struct work;
2087 struct f_uas *fu;
2088 unsigned int alt;
2089 };
2090
2091 static void tcm_delayed_set_alt(struct work_struct *wq)
2092 {
2093 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2094 work);
2095 struct f_uas *fu = work->fu;
2096 int alt = work->alt;
2097
2098 kfree(work);
2099
2100 if (fu->flags & USBG_IS_BOT)
2101 bot_cleanup_old_alt(fu);
2102 if (fu->flags & USBG_IS_UAS)
2103 uasp_cleanup_old_alt(fu);
2104
2105 if (alt == USB_G_ALT_INT_BBB)
2106 bot_set_alt(fu);
2107 else if (alt == USB_G_ALT_INT_UAS)
2108 uasp_set_alt(fu);
2109 usb_composite_setup_continue(fu->function.config->cdev);
2110 }
2111
2112 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2113 {
2114 struct f_uas *fu = to_f_uas(f);
2115
2116 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2117 struct guas_setup_wq *work;
2118
2119 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2120 if (!work)
2121 return -ENOMEM;
2122 INIT_WORK(&work->work, tcm_delayed_set_alt);
2123 work->fu = fu;
2124 work->alt = alt;
2125 schedule_work(&work->work);
2126 return USB_GADGET_DELAYED_STATUS;
2127 }
2128 return -EOPNOTSUPP;
2129 }
2130
2131 static void tcm_disable(struct usb_function *f)
2132 {
2133 struct f_uas *fu = to_f_uas(f);
2134
2135 if (fu->flags & USBG_IS_UAS)
2136 uasp_cleanup_old_alt(fu);
2137 else if (fu->flags & USBG_IS_BOT)
2138 bot_cleanup_old_alt(fu);
2139 fu->flags = 0;
2140 }
2141
2142 static int tcm_setup(struct usb_function *f,
2143 const struct usb_ctrlrequest *ctrl)
2144 {
2145 struct f_uas *fu = to_f_uas(f);
2146
2147 if (!(fu->flags & USBG_IS_BOT))
2148 return -EOPNOTSUPP;
2149
2150 return usbg_bot_setup(f, ctrl);
2151 }
2152
2153 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2154 {
2155 return container_of(to_config_group(item), struct f_tcm_opts,
2156 func_inst.group);
2157 }
2158
2159 static void tcm_attr_release(struct config_item *item)
2160 {
2161 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2162
2163 usb_put_function_instance(&opts->func_inst);
2164 }
2165
2166 static struct configfs_item_operations tcm_item_ops = {
2167 .release = tcm_attr_release,
2168 };
2169
2170 static const struct config_item_type tcm_func_type = {
2171 .ct_item_ops = &tcm_item_ops,
2172 .ct_owner = THIS_MODULE,
2173 };
2174
2175 static void tcm_free_inst(struct usb_function_instance *f)
2176 {
2177 struct f_tcm_opts *opts;
2178 unsigned i;
2179
2180 opts = container_of(f, struct f_tcm_opts, func_inst);
2181
2182 mutex_lock(&tpg_instances_lock);
2183 for (i = 0; i < TPG_INSTANCES; ++i)
2184 if (tpg_instances[i].func_inst == f)
2185 break;
2186 if (i < TPG_INSTANCES)
2187 tpg_instances[i].func_inst = NULL;
2188 mutex_unlock(&tpg_instances_lock);
2189
2190 kfree(opts);
2191 }
2192
2193 static int tcm_register_callback(struct usb_function_instance *f)
2194 {
2195 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2196
2197 mutex_lock(&opts->dep_lock);
2198 opts->can_attach = true;
2199 mutex_unlock(&opts->dep_lock);
2200
2201 return 0;
2202 }
2203
2204 static void tcm_unregister_callback(struct usb_function_instance *f)
2205 {
2206 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2207
2208 mutex_lock(&opts->dep_lock);
2209 unregister_gadget_item(opts->
2210 func_inst.group.cg_item.ci_parent->ci_parent);
2211 opts->can_attach = false;
2212 mutex_unlock(&opts->dep_lock);
2213 }
2214
2215 static int usbg_attach(struct usbg_tpg *tpg)
2216 {
2217 struct usb_function_instance *f = tpg->fi;
2218 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2219
2220 if (opts->tcm_register_callback)
2221 return opts->tcm_register_callback(f);
2222
2223 return 0;
2224 }
2225
2226 static void usbg_detach(struct usbg_tpg *tpg)
2227 {
2228 struct usb_function_instance *f = tpg->fi;
2229 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2230
2231 if (opts->tcm_unregister_callback)
2232 opts->tcm_unregister_callback(f);
2233 }
2234
2235 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2236 {
2237 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2238
2239 pr_debug("tcm: Activating %s\n", name);
2240
2241 mutex_lock(&opts->dep_lock);
2242 opts->ready = true;
2243 mutex_unlock(&opts->dep_lock);
2244
2245 return 0;
2246 }
2247
2248 static struct usb_function_instance *tcm_alloc_inst(void)
2249 {
2250 struct f_tcm_opts *opts;
2251 int i;
2252
2253
2254 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2255 if (!opts)
2256 return ERR_PTR(-ENOMEM);
2257
2258 mutex_lock(&tpg_instances_lock);
2259 for (i = 0; i < TPG_INSTANCES; ++i)
2260 if (!tpg_instances[i].func_inst)
2261 break;
2262
2263 if (i == TPG_INSTANCES) {
2264 mutex_unlock(&tpg_instances_lock);
2265 kfree(opts);
2266 return ERR_PTR(-EBUSY);
2267 }
2268 tpg_instances[i].func_inst = &opts->func_inst;
2269 mutex_unlock(&tpg_instances_lock);
2270
2271 mutex_init(&opts->dep_lock);
2272 opts->func_inst.set_inst_name = tcm_set_name;
2273 opts->func_inst.free_func_inst = tcm_free_inst;
2274 opts->tcm_register_callback = tcm_register_callback;
2275 opts->tcm_unregister_callback = tcm_unregister_callback;
2276
2277 config_group_init_type_name(&opts->func_inst.group, "",
2278 &tcm_func_type);
2279
2280 return &opts->func_inst;
2281 }
2282
2283 static void tcm_free(struct usb_function *f)
2284 {
2285 struct f_uas *tcm = to_f_uas(f);
2286
2287 kfree(tcm);
2288 }
2289
2290 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2291 {
2292 usb_free_all_descriptors(f);
2293 }
2294
2295 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2296 {
2297 struct f_uas *fu;
2298 unsigned i;
2299
2300 mutex_lock(&tpg_instances_lock);
2301 for (i = 0; i < TPG_INSTANCES; ++i)
2302 if (tpg_instances[i].func_inst == fi)
2303 break;
2304 if (i == TPG_INSTANCES) {
2305 mutex_unlock(&tpg_instances_lock);
2306 return ERR_PTR(-ENODEV);
2307 }
2308
2309 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2310 if (!fu) {
2311 mutex_unlock(&tpg_instances_lock);
2312 return ERR_PTR(-ENOMEM);
2313 }
2314
2315 fu->function.name = "Target Function";
2316 fu->function.bind = tcm_bind;
2317 fu->function.unbind = tcm_unbind;
2318 fu->function.set_alt = tcm_set_alt;
2319 fu->function.setup = tcm_setup;
2320 fu->function.disable = tcm_disable;
2321 fu->function.free_func = tcm_free;
2322 fu->tpg = tpg_instances[i].tpg;
2323 mutex_unlock(&tpg_instances_lock);
2324
2325 return &fu->function;
2326 }
2327
2328 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2329
2330 static int tcm_init(void)
2331 {
2332 int ret;
2333
2334 ret = usb_function_register(&tcmusb_func);
2335 if (ret)
2336 return ret;
2337
2338 ret = target_register_template(&usbg_ops);
2339 if (ret)
2340 usb_function_unregister(&tcmusb_func);
2341
2342 return ret;
2343 }
2344 module_init(tcm_init);
2345
2346 static void tcm_exit(void)
2347 {
2348 target_unregister_template(&usbg_ops);
2349 usb_function_unregister(&tcmusb_func);
2350 }
2351 module_exit(tcm_exit);
2352
2353 MODULE_LICENSE("GPL");
2354 MODULE_AUTHOR("Sebastian Andrzej Siewior");
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