projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
usb: gadget: composite: Return SSP Dev Cap descriptor
[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 25#include "u_tcm.h"
4bb8548d 26#include "configfs.h"
dc8c46a5 27
dc8c46a5
AP		 28#define TPG_INSTANCES 1
29
30struct tpg_instance {
31 struct usb_function_instance *func_inst;
32 struct usbg_tpg *tpg;
33};
34
35static struct tpg_instance tpg_instances[TPG_INSTANCES];
36
37static DEFINE_MUTEX(tpg_instances_lock);
08a1cb0f
AP		 38
39static inline struct f_uas *to_f_uas(struct usb_function *f)
40{
41 return container_of(f, struct f_uas, function);
42}
43
44static void usbg_cmd_release(struct kref *);
45
46static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
47{
48 kref_put(&cmd->ref, usbg_cmd_release);
49}
50
51/* Start bot.c code */
52
53static int bot_enqueue_cmd_cbw(struct f_uas *fu)
54{
55 int ret;
56
57 if (fu->flags & USBG_BOT_CMD_PEND)
58 return 0;
59
60 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
61 if (!ret)
62 fu->flags |= USBG_BOT_CMD_PEND;
63 return ret;
64}
65
66static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
67{
68 struct usbg_cmd *cmd = req->context;
69 struct f_uas *fu = cmd->fu;
70
71 usbg_cleanup_cmd(cmd);
72 if (req->status < 0) {
73 pr_err("ERR %s(%d)\n", __func__, __LINE__);
74 return;
75 }
76
77 /* CSW completed, wait for next CBW */
78 bot_enqueue_cmd_cbw(fu);
79}
80
81static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
82{
83 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
84 int ret;
08a1cb0f
AP		 85 unsigned int csw_stat;
86
87 csw_stat = cmd->csw_code;
08a1cb0f
AP		 88 csw->Tag = cmd->bot_tag;
89 csw->Status = csw_stat;
90 fu->bot_status.req->context = cmd;
91 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
92 if (ret)
93 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
94}
95
96static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
97{
98 struct usbg_cmd *cmd = req->context;
99 struct f_uas *fu = cmd->fu;
100
101 if (req->status < 0)
102 pr_err("ERR %s(%d)\n", __func__, __LINE__);
103
104 if (cmd->data_len) {
105 if (cmd->data_len > ep->maxpacket) {
106 req->length = ep->maxpacket;
107 cmd->data_len -= ep->maxpacket;
108 } else {
109 req->length = cmd->data_len;
110 cmd->data_len = 0;
111 }
112
113 usb_ep_queue(ep, req, GFP_ATOMIC);
114 return;
115 }
116 bot_enqueue_sense_code(fu, cmd);
117}
118
119static void bot_send_bad_status(struct usbg_cmd *cmd)
120{
121 struct f_uas *fu = cmd->fu;
122 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
123 struct usb_request *req;
124 struct usb_ep *ep;
125
126 csw->Residue = cpu_to_le32(cmd->data_len);
127
128 if (cmd->data_len) {
129 if (cmd->is_read) {
130 ep = fu->ep_in;
131 req = fu->bot_req_in;
132 } else {
133 ep = fu->ep_out;
134 req = fu->bot_req_out;
135 }
136
137 if (cmd->data_len > fu->ep_in->maxpacket) {
138 req->length = ep->maxpacket;
139 cmd->data_len -= ep->maxpacket;
140 } else {
141 req->length = cmd->data_len;
142 cmd->data_len = 0;
143 }
144 req->complete = bot_err_compl;
145 req->context = cmd;
146 req->buf = fu->cmd.buf;
147 usb_ep_queue(ep, req, GFP_KERNEL);
148 } else {
149 bot_enqueue_sense_code(fu, cmd);
150 }
151}
152
153static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
154{
155 struct f_uas *fu = cmd->fu;
156 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
157 int ret;
158
159 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
160 if (!moved_data && cmd->data_len) {
161 /*
162 * the host wants to move data, we don't. Fill / empty
163 * the pipe and then send the csw with reside set.
164 */
165 cmd->csw_code = US_BULK_STAT_OK;
166 bot_send_bad_status(cmd);
167 return 0;
168 }
169
170 csw->Tag = cmd->bot_tag;
171 csw->Residue = cpu_to_le32(0);
172 csw->Status = US_BULK_STAT_OK;
173 fu->bot_status.req->context = cmd;
174
175 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
176 if (ret)
177 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
178 } else {
179 cmd->csw_code = US_BULK_STAT_FAIL;
180 bot_send_bad_status(cmd);
181 }
182 return 0;
183}
184
185/*
186 * Called after command (no data transfer) or after the write (to device)
187 * operation is completed
188 */
189static int bot_send_status_response(struct usbg_cmd *cmd)
190{
191 bool moved_data = false;
192
193 if (!cmd->is_read)
194 moved_data = true;
195 return bot_send_status(cmd, moved_data);
196}
197
198/* Read request completed, now we have to send the CSW */
199static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
200{
201 struct usbg_cmd *cmd = req->context;
202
203 if (req->status < 0)
204 pr_err("ERR %s(%d)\n", __func__, __LINE__);
205
206 bot_send_status(cmd, true);
207}
208
209static int bot_send_read_response(struct usbg_cmd *cmd)
210{
211 struct f_uas *fu = cmd->fu;
212 struct se_cmd *se_cmd = &cmd->se_cmd;
213 struct usb_gadget *gadget = fuas_to_gadget(fu);
214 int ret;
215
216 if (!cmd->data_len) {
217 cmd->csw_code = US_BULK_STAT_PHASE;
218 bot_send_bad_status(cmd);
219 return 0;
220 }
221
222 if (!gadget->sg_supported) {
223 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
224 if (!cmd->data_buf)
225 return -ENOMEM;
226
227 sg_copy_to_buffer(se_cmd->t_data_sg,
228 se_cmd->t_data_nents,
229 cmd->data_buf,
230 se_cmd->data_length);
231
232 fu->bot_req_in->buf = cmd->data_buf;
233 } else {
234 fu->bot_req_in->buf = NULL;
235 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
236 fu->bot_req_in->sg = se_cmd->t_data_sg;
237 }
238
239 fu->bot_req_in->complete = bot_read_compl;
240 fu->bot_req_in->length = se_cmd->data_length;
241 fu->bot_req_in->context = cmd;
242 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
243 if (ret)
244 pr_err("%s(%d)\n", __func__, __LINE__);
245 return 0;
246}
247
248static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
249static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
250
251static int bot_send_write_request(struct usbg_cmd *cmd)
252{
253 struct f_uas *fu = cmd->fu;
254 struct se_cmd *se_cmd = &cmd->se_cmd;
255 struct usb_gadget *gadget = fuas_to_gadget(fu);
256 int ret;
257
258 init_completion(&cmd->write_complete);
259 cmd->fu = fu;
260
261 if (!cmd->data_len) {
262 cmd->csw_code = US_BULK_STAT_PHASE;
263 return -EINVAL;
264 }
265
266 if (!gadget->sg_supported) {
267 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
268 if (!cmd->data_buf)
269 return -ENOMEM;
270
271 fu->bot_req_out->buf = cmd->data_buf;
272 } else {
273 fu->bot_req_out->buf = NULL;
274 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
275 fu->bot_req_out->sg = se_cmd->t_data_sg;
276 }
277
278 fu->bot_req_out->complete = usbg_data_write_cmpl;
279 fu->bot_req_out->length = se_cmd->data_length;
280 fu->bot_req_out->context = cmd;
281
282 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
283 if (ret)
284 goto cleanup;
285 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
286 if (ret)
287 pr_err("%s(%d)\n", __func__, __LINE__);
288
289 wait_for_completion(&cmd->write_complete);
290 target_execute_cmd(se_cmd);
291cleanup:
292 return ret;
293}
294
295static int bot_submit_command(struct f_uas *, void *, unsigned int);
296
297static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
298{
299 struct f_uas *fu = req->context;
300 int ret;
301
302 fu->flags &= ~USBG_BOT_CMD_PEND;
303
304 if (req->status < 0)
305 return;
306
307 ret = bot_submit_command(fu, req->buf, req->actual);
308 if (ret)
309 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
310}
311
312static int bot_prepare_reqs(struct f_uas *fu)
313{
314 int ret;
315
316 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
317 if (!fu->bot_req_in)
318 goto err;
319
320 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
321 if (!fu->bot_req_out)
322 goto err_out;
323
324 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
325 if (!fu->cmd.req)
326 goto err_cmd;
327
328 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
329 if (!fu->bot_status.req)
330 goto err_sts;
331
332 fu->bot_status.req->buf = &fu->bot_status.csw;
333 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
334 fu->bot_status.req->complete = bot_status_complete;
335 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
336
337 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
338 if (!fu->cmd.buf)
339 goto err_buf;
340
341 fu->cmd.req->complete = bot_cmd_complete;
342 fu->cmd.req->buf = fu->cmd.buf;
343 fu->cmd.req->length = fu->ep_out->maxpacket;
344 fu->cmd.req->context = fu;
345
346 ret = bot_enqueue_cmd_cbw(fu);
347 if (ret)
348 goto err_queue;
349 return 0;
350err_queue:
351 kfree(fu->cmd.buf);
352 fu->cmd.buf = NULL;
353err_buf:
354 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
355err_sts:
356 usb_ep_free_request(fu->ep_out, fu->cmd.req);
357 fu->cmd.req = NULL;
358err_cmd:
359 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
360 fu->bot_req_out = NULL;
361err_out:
362 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
363 fu->bot_req_in = NULL;
364err:
365 pr_err("BOT: endpoint setup failed\n");
366 return -ENOMEM;
367}
368
369static void bot_cleanup_old_alt(struct f_uas *fu)
370{
371 if (!(fu->flags & USBG_ENABLED))
372 return;
373
374 usb_ep_disable(fu->ep_in);
375 usb_ep_disable(fu->ep_out);
376
377 if (!fu->bot_req_in)
378 return;
379
380 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
381 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
382 usb_ep_free_request(fu->ep_out, fu->cmd.req);
383 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
384
385 kfree(fu->cmd.buf);
386
387 fu->bot_req_in = NULL;
388 fu->bot_req_out = NULL;
389 fu->cmd.req = NULL;
390 fu->bot_status.req = NULL;
391 fu->cmd.buf = NULL;
392}
393
394static void bot_set_alt(struct f_uas *fu)
395{
396 struct usb_function *f = &fu->function;
397 struct usb_gadget *gadget = f->config->cdev->gadget;
398 int ret;
399
400 fu->flags = USBG_IS_BOT;
401
402 config_ep_by_speed(gadget, f, fu->ep_in);
403 ret = usb_ep_enable(fu->ep_in);
404 if (ret)
405 goto err_b_in;
406
407 config_ep_by_speed(gadget, f, fu->ep_out);
408 ret = usb_ep_enable(fu->ep_out);
409 if (ret)
410 goto err_b_out;
411
412 ret = bot_prepare_reqs(fu);
413 if (ret)
414 goto err_wq;
415 fu->flags |= USBG_ENABLED;
416 pr_info("Using the BOT protocol\n");
417 return;
418err_wq:
419 usb_ep_disable(fu->ep_out);
420err_b_out:
421 usb_ep_disable(fu->ep_in);
422err_b_in:
423 fu->flags = USBG_IS_BOT;
424}
425
426static int usbg_bot_setup(struct usb_function *f,
427 const struct usb_ctrlrequest *ctrl)
428{
429 struct f_uas *fu = to_f_uas(f);
430 struct usb_composite_dev *cdev = f->config->cdev;
431 u16 w_value = le16_to_cpu(ctrl->wValue);
432 u16 w_length = le16_to_cpu(ctrl->wLength);
433 int luns;
434 u8 *ret_lun;
435
436 switch (ctrl->bRequest) {
437 case US_BULK_GET_MAX_LUN:
438 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
439 USB_RECIP_INTERFACE))
440 return -ENOTSUPP;
441
442 if (w_length < 1)
443 return -EINVAL;
444 if (w_value != 0)
445 return -EINVAL;
446 luns = atomic_read(&fu->tpg->tpg_port_count);
447 if (!luns) {
448 pr_err("No LUNs configured?\n");
449 return -EINVAL;
450 }
451 /*
452 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
453 * accessed. The upper limit is 0xf
454 */
455 luns--;
456 if (luns > 0xf) {
457 pr_info_once("Limiting the number of luns to 16\n");
458 luns = 0xf;
459 }
460 ret_lun = cdev->req->buf;
461 *ret_lun = luns;
462 cdev->req->length = 1;
463 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
464
465 case US_BULK_RESET_REQUEST:
466 /* XXX maybe we should remove previous requests for IN + OUT */
467 bot_enqueue_cmd_cbw(fu);
468 return 0;
469 }
470 return -ENOTSUPP;
471}
472
473/* Start uas.c code */
474
475static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
476{
477 /* We have either all three allocated or none */
478 if (!stream->req_in)
479 return;
480
481 usb_ep_free_request(fu->ep_in, stream->req_in);
482 usb_ep_free_request(fu->ep_out, stream->req_out);
483 usb_ep_free_request(fu->ep_status, stream->req_status);
484
485 stream->req_in = NULL;
486 stream->req_out = NULL;
487 stream->req_status = NULL;
488}
489
490static void uasp_free_cmdreq(struct f_uas *fu)
491{
492 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
493 kfree(fu->cmd.buf);
494 fu->cmd.req = NULL;
495 fu->cmd.buf = NULL;
496}
497
498static void uasp_cleanup_old_alt(struct f_uas *fu)
499{
500 int i;
501
502 if (!(fu->flags & USBG_ENABLED))
503 return;
504
505 usb_ep_disable(fu->ep_in);
506 usb_ep_disable(fu->ep_out);
507 usb_ep_disable(fu->ep_status);
508 usb_ep_disable(fu->ep_cmd);
509
510 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
511 uasp_cleanup_one_stream(fu, &fu->stream[i]);
512 uasp_free_cmdreq(fu);
513}
514
515static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
516
517static int uasp_prepare_r_request(struct usbg_cmd *cmd)
518{
519 struct se_cmd *se_cmd = &cmd->se_cmd;
520 struct f_uas *fu = cmd->fu;
521 struct usb_gadget *gadget = fuas_to_gadget(fu);
522 struct uas_stream *stream = cmd->stream;
523
524 if (!gadget->sg_supported) {
525 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
526 if (!cmd->data_buf)
527 return -ENOMEM;
528
529 sg_copy_to_buffer(se_cmd->t_data_sg,
530 se_cmd->t_data_nents,
531 cmd->data_buf,
532 se_cmd->data_length);
533
534 stream->req_in->buf = cmd->data_buf;
535 } else {
536 stream->req_in->buf = NULL;
537 stream->req_in->num_sgs = se_cmd->t_data_nents;
538 stream->req_in->sg = se_cmd->t_data_sg;
539 }
540
541 stream->req_in->complete = uasp_status_data_cmpl;
542 stream->req_in->length = se_cmd->data_length;
543 stream->req_in->context = cmd;
544
545 cmd->state = UASP_SEND_STATUS;
546 return 0;
547}
548
549static void uasp_prepare_status(struct usbg_cmd *cmd)
550{
551 struct se_cmd *se_cmd = &cmd->se_cmd;
552 struct sense_iu *iu = &cmd->sense_iu;
553 struct uas_stream *stream = cmd->stream;
554
555 cmd->state = UASP_QUEUE_COMMAND;
556 iu->iu_id = IU_ID_STATUS;
557 iu->tag = cpu_to_be16(cmd->tag);
558
559 /*
560 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
561 */
562 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
563 iu->status = se_cmd->scsi_status;
564 stream->req_status->context = cmd;
565 stream->req_status->length = se_cmd->scsi_sense_length + 16;
566 stream->req_status->buf = iu;
567 stream->req_status->complete = uasp_status_data_cmpl;
568}
569
570static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
571{
572 struct usbg_cmd *cmd = req->context;
573 struct uas_stream *stream = cmd->stream;
574 struct f_uas *fu = cmd->fu;
575 int ret;
576
577 if (req->status < 0)
578 goto cleanup;
579
580 switch (cmd->state) {
581 case UASP_SEND_DATA:
582 ret = uasp_prepare_r_request(cmd);
583 if (ret)
584 goto cleanup;
585 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
586 if (ret)
587 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
588 break;
589
590 case UASP_RECEIVE_DATA:
591 ret = usbg_prepare_w_request(cmd, stream->req_out);
592 if (ret)
593 goto cleanup;
594 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
595 if (ret)
596 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
597 break;
598
599 case UASP_SEND_STATUS:
600 uasp_prepare_status(cmd);
601 ret = usb_ep_queue(fu->ep_status, stream->req_status,
602 GFP_ATOMIC);
603 if (ret)
604 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
605 break;
606
607 case UASP_QUEUE_COMMAND:
608 usbg_cleanup_cmd(cmd);
609 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
610 break;
611
612 default:
613 BUG();
614 }
615 return;
616
617cleanup:
618 usbg_cleanup_cmd(cmd);
619}
620
621static int uasp_send_status_response(struct usbg_cmd *cmd)
622{
623 struct f_uas *fu = cmd->fu;
624 struct uas_stream *stream = cmd->stream;
625 struct sense_iu *iu = &cmd->sense_iu;
626
627 iu->tag = cpu_to_be16(cmd->tag);
628 stream->req_status->complete = uasp_status_data_cmpl;
629 stream->req_status->context = cmd;
630 cmd->fu = fu;
631 uasp_prepare_status(cmd);
632 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
633}
634
635static int uasp_send_read_response(struct usbg_cmd *cmd)
636{
637 struct f_uas *fu = cmd->fu;
638 struct uas_stream *stream = cmd->stream;
639 struct sense_iu *iu = &cmd->sense_iu;
640 int ret;
641
642 cmd->fu = fu;
643
644 iu->tag = cpu_to_be16(cmd->tag);
645 if (fu->flags & USBG_USE_STREAMS) {
646
647 ret = uasp_prepare_r_request(cmd);
648 if (ret)
649 goto out;
650 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
651 if (ret) {
652 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
653 kfree(cmd->data_buf);
654 cmd->data_buf = NULL;
655 }
656
657 } else {
658
659 iu->iu_id = IU_ID_READ_READY;
660 iu->tag = cpu_to_be16(cmd->tag);
661
662 stream->req_status->complete = uasp_status_data_cmpl;
663 stream->req_status->context = cmd;
664
665 cmd->state = UASP_SEND_DATA;
666 stream->req_status->buf = iu;
667 stream->req_status->length = sizeof(struct iu);
668
669 ret = usb_ep_queue(fu->ep_status, stream->req_status,
670 GFP_ATOMIC);
671 if (ret)
672 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
673 }
674out:
675 return ret;
676}
677
678static int uasp_send_write_request(struct usbg_cmd *cmd)
679{
680 struct f_uas *fu = cmd->fu;
681 struct se_cmd *se_cmd = &cmd->se_cmd;
682 struct uas_stream *stream = cmd->stream;
683 struct sense_iu *iu = &cmd->sense_iu;
684 int ret;
685
686 init_completion(&cmd->write_complete);
687 cmd->fu = fu;
688
689 iu->tag = cpu_to_be16(cmd->tag);
690
691 if (fu->flags & USBG_USE_STREAMS) {
692
693 ret = usbg_prepare_w_request(cmd, stream->req_out);
694 if (ret)
695 goto cleanup;
696 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
697 if (ret)
698 pr_err("%s(%d)\n", __func__, __LINE__);
699
700 } else {
701
702 iu->iu_id = IU_ID_WRITE_READY;
703 iu->tag = cpu_to_be16(cmd->tag);
704
705 stream->req_status->complete = uasp_status_data_cmpl;
706 stream->req_status->context = cmd;
707
708 cmd->state = UASP_RECEIVE_DATA;
709 stream->req_status->buf = iu;
710 stream->req_status->length = sizeof(struct iu);
711
712 ret = usb_ep_queue(fu->ep_status, stream->req_status,
713 GFP_ATOMIC);
714 if (ret)
715 pr_err("%s(%d)\n", __func__, __LINE__);
716 }
717
718 wait_for_completion(&cmd->write_complete);
719 target_execute_cmd(se_cmd);
720cleanup:
721 return ret;
722}
723
724static int usbg_submit_command(struct f_uas *, void *, unsigned int);
725
726static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
727{
728 struct f_uas *fu = req->context;
729 int ret;
730
731 if (req->status < 0)
732 return;
733
734 ret = usbg_submit_command(fu, req->buf, req->actual);
735 /*
736 * Once we tune for performance enqueue the command req here again so
737 * we can receive a second command while we processing this one. Pay
738 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
739 * don't break HS.
740 */
741 if (!ret)
742 return;
743 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
744}
745
746static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
747{
748 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
749 if (!stream->req_in)
750 goto out;
751
752 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
753 if (!stream->req_out)
754 goto err_out;
755
756 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
757 if (!stream->req_status)
758 goto err_sts;
759
760 return 0;
761err_sts:
762 usb_ep_free_request(fu->ep_status, stream->req_status);
763 stream->req_status = NULL;
764err_out:
765 usb_ep_free_request(fu->ep_out, stream->req_out);
766 stream->req_out = NULL;
767out:
768 return -ENOMEM;
769}
770
771static int uasp_alloc_cmd(struct f_uas *fu)
772{
773 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
774 if (!fu->cmd.req)
775 goto err;
776
777 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
778 if (!fu->cmd.buf)
779 goto err_buf;
780
781 fu->cmd.req->complete = uasp_cmd_complete;
782 fu->cmd.req->buf = fu->cmd.buf;
783 fu->cmd.req->length = fu->ep_cmd->maxpacket;
784 fu->cmd.req->context = fu;
785 return 0;
786
787err_buf:
788 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
789err:
790 return -ENOMEM;
791}
792
793static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
794{
795 int i;
796
797 for (i = 0; i < max_streams; i++) {
798 struct uas_stream *s = &fu->stream[i];
799
800 s->req_in->stream_id = i + 1;
801 s->req_out->stream_id = i + 1;
802 s->req_status->stream_id = i + 1;
803 }
804}
805
806static int uasp_prepare_reqs(struct f_uas *fu)
807{
808 int ret;
809 int i;
810 int max_streams;
811
812 if (fu->flags & USBG_USE_STREAMS)
813 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
814 else
815 max_streams = 1;
816
817 for (i = 0; i < max_streams; i++) {
818 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
819 if (ret)
820 goto err_cleanup;
821 }
822
823 ret = uasp_alloc_cmd(fu);
824 if (ret)
825 goto err_free_stream;
826 uasp_setup_stream_res(fu, max_streams);
827
828 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
829 if (ret)
830 goto err_free_stream;
831
832 return 0;
833
834err_free_stream:
835 uasp_free_cmdreq(fu);
836
837err_cleanup:
838 if (i) {
839 do {
840 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
841 i--;
842 } while (i);
843 }
844 pr_err("UASP: endpoint setup failed\n");
845 return ret;
846}
847
848static void uasp_set_alt(struct f_uas *fu)
849{
850 struct usb_function *f = &fu->function;
851 struct usb_gadget *gadget = f->config->cdev->gadget;
852 int ret;
853
854 fu->flags = USBG_IS_UAS;
855
856 if (gadget->speed == USB_SPEED_SUPER)
857 fu->flags |= USBG_USE_STREAMS;
858
859 config_ep_by_speed(gadget, f, fu->ep_in);
860 ret = usb_ep_enable(fu->ep_in);
861 if (ret)
862 goto err_b_in;
863
864 config_ep_by_speed(gadget, f, fu->ep_out);
865 ret = usb_ep_enable(fu->ep_out);
866 if (ret)
867 goto err_b_out;
868
869 config_ep_by_speed(gadget, f, fu->ep_cmd);
870 ret = usb_ep_enable(fu->ep_cmd);
871 if (ret)
872 goto err_cmd;
873 config_ep_by_speed(gadget, f, fu->ep_status);
874 ret = usb_ep_enable(fu->ep_status);
875 if (ret)
876 goto err_status;
877
878 ret = uasp_prepare_reqs(fu);
879 if (ret)
880 goto err_wq;
881 fu->flags |= USBG_ENABLED;
882
883 pr_info("Using the UAS protocol\n");
884 return;
885err_wq:
886 usb_ep_disable(fu->ep_status);
887err_status:
888 usb_ep_disable(fu->ep_cmd);
889err_cmd:
890 usb_ep_disable(fu->ep_out);
891err_b_out:
892 usb_ep_disable(fu->ep_in);
893err_b_in:
894 fu->flags = 0;
895}
896
897static int get_cmd_dir(const unsigned char *cdb)
898{
899 int ret;
900
901 switch (cdb[0]) {
902 case READ_6:
903 case READ_10:
904 case READ_12:
905 case READ_16:
906 case INQUIRY:
907 case MODE_SENSE:
908 case MODE_SENSE_10:
909 case SERVICE_ACTION_IN_16:
910 case MAINTENANCE_IN:
911 case PERSISTENT_RESERVE_IN:
912 case SECURITY_PROTOCOL_IN:
913 case ACCESS_CONTROL_IN:
914 case REPORT_LUNS:
915 case READ_BLOCK_LIMITS:
916 case READ_POSITION:
917 case READ_CAPACITY:
918 case READ_TOC:
919 case READ_FORMAT_CAPACITIES:
920 case REQUEST_SENSE:
921 ret = DMA_FROM_DEVICE;
922 break;
923
924 case WRITE_6:
925 case WRITE_10:
926 case WRITE_12:
927 case WRITE_16:
928 case MODE_SELECT:
929 case MODE_SELECT_10:
930 case WRITE_VERIFY:
931 case WRITE_VERIFY_12:
932 case PERSISTENT_RESERVE_OUT:
933 case MAINTENANCE_OUT:
934 case SECURITY_PROTOCOL_OUT:
935 case ACCESS_CONTROL_OUT:
936 ret = DMA_TO_DEVICE;
937 break;
938 case ALLOW_MEDIUM_REMOVAL:
939 case TEST_UNIT_READY:
940 case SYNCHRONIZE_CACHE:
941 case START_STOP:
942 case ERASE:
943 case REZERO_UNIT:
944 case SEEK_10:
945 case SPACE:
946 case VERIFY:
947 case WRITE_FILEMARKS:
948 ret = DMA_NONE;
949 break;
950 default:
951#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
952 pr_warn(CMD_DIR_MSG, cdb[0]);
953#undef CMD_DIR_MSG
954 ret = -EINVAL;
955 }
956 return ret;
957}
958
959static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
960{
961 struct usbg_cmd *cmd = req->context;
962 struct se_cmd *se_cmd = &cmd->se_cmd;
963
964 if (req->status < 0) {
965 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
966 goto cleanup;
967 }
968
969 if (req->num_sgs == 0) {
970 sg_copy_from_buffer(se_cmd->t_data_sg,
971 se_cmd->t_data_nents,
972 cmd->data_buf,
973 se_cmd->data_length);
974 }
975
976 complete(&cmd->write_complete);
977 return;
978
979cleanup:
980 usbg_cleanup_cmd(cmd);
981}
982
983static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
984{
985 struct se_cmd *se_cmd = &cmd->se_cmd;
986 struct f_uas *fu = cmd->fu;
987 struct usb_gadget *gadget = fuas_to_gadget(fu);
988
989 if (!gadget->sg_supported) {
990 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
991 if (!cmd->data_buf)
992 return -ENOMEM;
993
994 req->buf = cmd->data_buf;
995 } else {
996 req->buf = NULL;
997 req->num_sgs = se_cmd->t_data_nents;
998 req->sg = se_cmd->t_data_sg;
999 }
1000
1001 req->complete = usbg_data_write_cmpl;
1002 req->length = se_cmd->data_length;
1003 req->context = cmd;
1004 return 0;
1005}
1006
1007static int usbg_send_status_response(struct se_cmd *se_cmd)
1008{
1009 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1010 se_cmd);
1011 struct f_uas *fu = cmd->fu;
1012
1013 if (fu->flags & USBG_IS_BOT)
1014 return bot_send_status_response(cmd);
1015 else
1016 return uasp_send_status_response(cmd);
1017}
1018
1019static int usbg_send_write_request(struct se_cmd *se_cmd)
1020{
1021 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1022 se_cmd);
1023 struct f_uas *fu = cmd->fu;
1024
1025 if (fu->flags & USBG_IS_BOT)
1026 return bot_send_write_request(cmd);
1027 else
1028 return uasp_send_write_request(cmd);
1029}
1030
1031static int usbg_send_read_response(struct se_cmd *se_cmd)
1032{
1033 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1034 se_cmd);
1035 struct f_uas *fu = cmd->fu;
1036
1037 if (fu->flags & USBG_IS_BOT)
1038 return bot_send_read_response(cmd);
1039 else
1040 return uasp_send_read_response(cmd);
1041}
1042
1043static void usbg_cmd_work(struct work_struct *work)
1044{
1045 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1046 struct se_cmd *se_cmd;
1047 struct tcm_usbg_nexus *tv_nexus;
1048 struct usbg_tpg *tpg;
1049 int dir;
1050
1051 se_cmd = &cmd->se_cmd;
1052 tpg = cmd->fu->tpg;
1053 tv_nexus = tpg->tpg_nexus;
1054 dir = get_cmd_dir(cmd->cmd_buf);
1055 if (dir < 0) {
1056 transport_init_se_cmd(se_cmd,
1057 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1058 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1059 cmd->prio_attr, cmd->sense_iu.sense);
1060 goto out;
1061 }
1062
1063 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1064 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1065 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1066 goto out;
1067
1068 return;
1069
1070out:
1071 transport_send_check_condition_and_sense(se_cmd,
1072 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1073 usbg_cleanup_cmd(cmd);
1074}
1075
1076static int usbg_submit_command(struct f_uas *fu,
1077 void *cmdbuf, unsigned int len)
1078{
1079 struct command_iu *cmd_iu = cmdbuf;
1080 struct usbg_cmd *cmd;
1081 struct usbg_tpg *tpg;
08a1cb0f
AP		 1082 struct tcm_usbg_nexus *tv_nexus;
1083 u32 cmd_len;
1084
1085 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1086 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1087 return -EINVAL;
1088 }
1089
1090 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1091 if (!cmd)
1092 return -ENOMEM;
1093
1094 cmd->fu = fu;
1095
1096 /* XXX until I figure out why I can't free in on complete */
1097 kref_init(&cmd->ref);
1098 kref_get(&cmd->ref);
1099
1100 tpg = fu->tpg;
1101 cmd_len = (cmd_iu->len & ~0x3) + 16;
1102 if (cmd_len > USBG_MAX_CMD)
1103 goto err;
1104
1105 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1106
1107 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1108 cmd->se_cmd.tag = cmd->tag;
1109 if (fu->flags & USBG_USE_STREAMS) {
1110 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1111 goto err;
1112 if (!cmd->tag)
1113 cmd->stream = &fu->stream[0];
1114 else
1115 cmd->stream = &fu->stream[cmd->tag - 1];
1116 } else {
1117 cmd->stream = &fu->stream[0];
1118 }
1119
1120 tv_nexus = tpg->tpg_nexus;
1121 if (!tv_nexus) {
1122 pr_err("Missing nexus, ignoring command\n");
1123 goto err;
1124 }
1125
1126 switch (cmd_iu->prio_attr & 0x7) {
1127 case UAS_HEAD_TAG:
1128 cmd->prio_attr = TCM_HEAD_TAG;
1129 break;
1130 case UAS_ORDERED_TAG:
1131 cmd->prio_attr = TCM_ORDERED_TAG;
1132 break;
1133 case UAS_ACA:
1134 cmd->prio_attr = TCM_ACA_TAG;
1135 break;
1136 default:
1137 pr_debug_once("Unsupported prio_attr: %02x.\n",
1138 cmd_iu->prio_attr);
1139 case UAS_SIMPLE_TAG:
1140 cmd->prio_attr = TCM_SIMPLE_TAG;
1141 break;
1142 }
1143
08a1cb0f
AP		 1144 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1145
1146 INIT_WORK(&cmd->work, usbg_cmd_work);
1147 queue_work(tpg->workqueue, &cmd->work);
1148
1149 return 0;
1150err:
1151 kfree(cmd);
1152 return -EINVAL;
1153}
1154
1155static void bot_cmd_work(struct work_struct *work)
1156{
1157 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1158 struct se_cmd *se_cmd;
1159 struct tcm_usbg_nexus *tv_nexus;
1160 struct usbg_tpg *tpg;
1161 int dir;
1162
1163 se_cmd = &cmd->se_cmd;
1164 tpg = cmd->fu->tpg;
1165 tv_nexus = tpg->tpg_nexus;
1166 dir = get_cmd_dir(cmd->cmd_buf);
1167 if (dir < 0) {
1168 transport_init_se_cmd(se_cmd,
1169 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1170 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1171 cmd->prio_attr, cmd->sense_iu.sense);
1172 goto out;
1173 }
1174
1175 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1176 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1177 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1178 goto out;
1179
1180 return;
1181
1182out:
1183 transport_send_check_condition_and_sense(se_cmd,
1184 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1185 usbg_cleanup_cmd(cmd);
1186}
1187
1188static int bot_submit_command(struct f_uas *fu,
1189 void *cmdbuf, unsigned int len)
1190{
1191 struct bulk_cb_wrap *cbw = cmdbuf;
1192 struct usbg_cmd *cmd;
1193 struct usbg_tpg *tpg;
08a1cb0f
AP		 1194 struct tcm_usbg_nexus *tv_nexus;
1195 u32 cmd_len;
1196
1197 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1198 pr_err("Wrong signature on CBW\n");
1199 return -EINVAL;
1200 }
1201 if (len != 31) {
1202 pr_err("Wrong length for CBW\n");
1203 return -EINVAL;
1204 }
1205
1206 cmd_len = cbw->Length;
1207 if (cmd_len < 1 || cmd_len > 16)
1208 return -EINVAL;
1209
1210 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1211 if (!cmd)
1212 return -ENOMEM;
1213
1214 cmd->fu = fu;
1215
1216 /* XXX until I figure out why I can't free in on complete */
1217 kref_init(&cmd->ref);
1218 kref_get(&cmd->ref);
1219
1220 tpg = fu->tpg;
1221
1222 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1223
1224 cmd->bot_tag = cbw->Tag;
1225
1226 tv_nexus = tpg->tpg_nexus;
1227 if (!tv_nexus) {
1228 pr_err("Missing nexus, ignoring command\n");
1229 goto err;
1230 }
1231
1232 cmd->prio_attr = TCM_SIMPLE_TAG;
08a1cb0f
AP		 1233 cmd->unpacked_lun = cbw->Lun;
1234 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1235 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1236 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1237
1238 INIT_WORK(&cmd->work, bot_cmd_work);
1239 queue_work(tpg->workqueue, &cmd->work);
1240
1241 return 0;
1242err:
1243 kfree(cmd);
1244 return -EINVAL;
1245}
1246
1247/* Start fabric.c code */
1248
1249static int usbg_check_true(struct se_portal_group *se_tpg)
1250{
1251 return 1;
1252}
1253
1254static int usbg_check_false(struct se_portal_group *se_tpg)
1255{
1256 return 0;
1257}
1258
1259static char *usbg_get_fabric_name(void)
1260{
1261 return "usb_gadget";
1262}
1263
1264static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1265{
1266 struct usbg_tpg *tpg = container_of(se_tpg,
1267 struct usbg_tpg, se_tpg);
1268 struct usbg_tport *tport = tpg->tport;
1269
1270 return &tport->tport_name[0];
1271}
1272
1273static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1274{
1275 struct usbg_tpg *tpg = container_of(se_tpg,
1276 struct usbg_tpg, se_tpg);
1277 return tpg->tport_tpgt;
1278}
1279
1280static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1281{
1282 return 1;
1283}
1284
1285static void usbg_cmd_release(struct kref *ref)
1286{
1287 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1288 ref);
1289
1290 transport_generic_free_cmd(&cmd->se_cmd, 0);
1291}
1292
1293static void usbg_release_cmd(struct se_cmd *se_cmd)
1294{
1295 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1296 se_cmd);
1297 kfree(cmd->data_buf);
1298 kfree(cmd);
1299}
1300
1301static int usbg_shutdown_session(struct se_session *se_sess)
1302{
1303 return 0;
1304}
1305
1306static void usbg_close_session(struct se_session *se_sess)
1307{
1308}
1309
1310static u32 usbg_sess_get_index(struct se_session *se_sess)
1311{
1312 return 0;
1313}
1314
1315/*
1316 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1317 */
1318static int usbg_write_pending_status(struct se_cmd *se_cmd)
1319{
1320 return 0;
1321}
1322
1323static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1324{
1325}
1326
1327static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1328{
1329 return 0;
1330}
1331
1332static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1333{
1334}
1335
1336static void usbg_aborted_task(struct se_cmd *se_cmd)
1337{
1338}
1339
1340static const char *usbg_check_wwn(const char *name)
1341{
1342 const char *n;
1343 unsigned int len;
1344
1345 n = strstr(name, "naa.");
1346 if (!n)
1347 return NULL;
1348 n += 4;
1349 len = strlen(n);
1350 if (len == 0 || len > USBG_NAMELEN - 1)
1351 return NULL;
1352 return n;
1353}
1354
1355static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1356{
1357 if (!usbg_check_wwn(name))
1358 return -EINVAL;
1359 return 0;
1360}
1361
08a1cb0f
AP		 1362static struct se_portal_group *usbg_make_tpg(
1363 struct se_wwn *wwn,
1364 struct config_group *group,
1365 const char *name)
1366{
1367 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1368 tport_wwn);
1369 struct usbg_tpg *tpg;
1370 unsigned long tpgt;
1371 int ret;
dc8c46a5
AP		 1372 struct f_tcm_opts *opts;
1373 unsigned i;
08a1cb0f
AP		 1374
1375 if (strstr(name, "tpgt_") != name)
1376 return ERR_PTR(-EINVAL);
1377 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1378 return ERR_PTR(-EINVAL);
dc8c46a5
AP		 1379 ret = -ENODEV;
1380 mutex_lock(&tpg_instances_lock);
1381 for (i = 0; i < TPG_INSTANCES; ++i)
1382 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1383 break;
1384 if (i == TPG_INSTANCES)
1385 goto unlock_inst;
1386
1387 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1388 func_inst);
1389 mutex_lock(&opts->dep_lock);
1390 if (!opts->ready)
1391 goto unlock_dep;
1392
4bb8548d
AP		 1393 if (opts->has_dep) {
1394 if (!try_module_get(opts->dependent))
1395 goto unlock_dep;
1396 } else {
1397 ret = configfs_depend_item_unlocked(
1398 group->cg_subsys,
1399 &opts->func_inst.group.cg_item);
1400 if (ret)
1401 goto unlock_dep;
1402 }
08a1cb0f
AP		 1403
1404 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
dc8c46a5 1405 ret = -ENOMEM;
08a1cb0f 1406 if (!tpg)
dc8c46a5 1407 goto unref_dep;
08a1cb0f
AP		 1408 mutex_init(&tpg->tpg_mutex);
1409 atomic_set(&tpg->tpg_port_count, 0);
1410 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
e5587ea1 1411 if (!tpg->workqueue)
dc8c46a5 1412 goto free_tpg;
08a1cb0f
AP		 1413
1414 tpg->tport = tport;
1415 tpg->tport_tpgt = tpgt;
1416
1417 /*
1418 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1419 * pretend to be SAS..
1420 */
1421 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
e5587ea1 1422 if (ret < 0)
dc8c46a5 1423 goto free_workqueue;
e5587ea1 1424
dc8c46a5
AP		 1425 tpg_instances[i].tpg = tpg;
1426 tpg->fi = tpg_instances[i].func_inst;
1427 mutex_unlock(&opts->dep_lock);
1428 mutex_unlock(&tpg_instances_lock);
08a1cb0f 1429 return &tpg->se_tpg;
e5587ea1 1430
dc8c46a5
AP		 1431free_workqueue:
1432 destroy_workqueue(tpg->workqueue);
1433free_tpg:
1434 kfree(tpg);
1435unref_dep:
4bb8548d
AP		 1436 if (opts->has_dep)
1437 module_put(opts->dependent);
1438 else
1439 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
dc8c46a5
AP		 1440unlock_dep:
1441 mutex_unlock(&opts->dep_lock);
1442unlock_inst:
1443 mutex_unlock(&tpg_instances_lock);
1444
1445 return ERR_PTR(ret);
08a1cb0f
AP		 1446}
1447
1448static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1449
1450static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1451{
1452 struct usbg_tpg *tpg = container_of(se_tpg,
1453 struct usbg_tpg, se_tpg);
dc8c46a5
AP		 1454 unsigned i;
1455 struct f_tcm_opts *opts;
08a1cb0f
AP		 1456
1457 tcm_usbg_drop_nexus(tpg);
1458 core_tpg_deregister(se_tpg);
1459 destroy_workqueue(tpg->workqueue);
dc8c46a5 1460
dc8c46a5
AP		 1461 mutex_lock(&tpg_instances_lock);
1462 for (i = 0; i < TPG_INSTANCES; ++i)
1463 if (tpg_instances[i].tpg == tpg)
1464 break;
1465 if (i < TPG_INSTANCES)
1466 tpg_instances[i].tpg = NULL;
1467 opts = container_of(tpg_instances[i].func_inst,
1468 struct f_tcm_opts, func_inst);
1469 mutex_lock(&opts->dep_lock);
4bb8548d
AP		 1470 if (opts->has_dep)
1471 module_put(opts->dependent);
1472 else
1473 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
dc8c46a5
AP		 1474 mutex_unlock(&opts->dep_lock);
1475 mutex_unlock(&tpg_instances_lock);
e5587ea1 1476
08a1cb0f 1477 kfree(tpg);
08a1cb0f
AP		 1478}
1479
1480static struct se_wwn *usbg_make_tport(
1481 struct target_fabric_configfs *tf,
1482 struct config_group *group,
1483 const char *name)
1484{
1485 struct usbg_tport *tport;
1486 const char *wnn_name;
1487 u64 wwpn = 0;
1488
1489 wnn_name = usbg_check_wwn(name);
1490 if (!wnn_name)
1491 return ERR_PTR(-EINVAL);
1492
1493 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1494 if (!(tport))
1495 return ERR_PTR(-ENOMEM);
dc8c46a5 1496
08a1cb0f
AP		 1497 tport->tport_wwpn = wwpn;
1498 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1499 return &tport->tport_wwn;
1500}
1501
1502static void usbg_drop_tport(struct se_wwn *wwn)
1503{
1504 struct usbg_tport *tport = container_of(wwn,
1505 struct usbg_tport, tport_wwn);
1506 kfree(tport);
1507}
1508
1509/*
1510 * If somebody feels like dropping the version property, go ahead.
1511 */
1512static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1513{
1514 return sprintf(page, "usb-gadget fabric module\n");
1515}
1516
1517CONFIGFS_ATTR_RO(usbg_wwn_, version);
1518
1519static struct configfs_attribute *usbg_wwn_attrs[] = {
1520 &usbg_wwn_attr_version,
1521 NULL,
1522};
1523
1524static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1525{
1526 struct se_portal_group *se_tpg = to_tpg(item);
1527 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1528
1529 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1530}
1531
1532static int usbg_attach(struct usbg_tpg *);
1533static void usbg_detach(struct usbg_tpg *);
1534
1535static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1536 const char *page, size_t count)
1537{
1538 struct se_portal_group *se_tpg = to_tpg(item);
1539 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1540 bool op;
1541 ssize_t ret;
1542
1543 ret = strtobool(page, &op);
1544 if (ret)
1545 return ret;
1546
1547 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1548 return -EINVAL;
1549
1550 if (op)
1551 ret = usbg_attach(tpg);
1552 else
1553 usbg_detach(tpg);
1554 if (ret)
1555 return ret;
1556
1557 tpg->gadget_connect = op;
1558
1559 return count;
1560}
1561
1562static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1563{
1564 struct se_portal_group *se_tpg = to_tpg(item);
1565 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1566 struct tcm_usbg_nexus *tv_nexus;
1567 ssize_t ret;
1568
1569 mutex_lock(&tpg->tpg_mutex);
1570 tv_nexus = tpg->tpg_nexus;
1571 if (!tv_nexus) {
1572 ret = -ENODEV;
1573 goto out;
1574 }
1575 ret = snprintf(page, PAGE_SIZE, "%s\n",
1576 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1577out:
1578 mutex_unlock(&tpg->tpg_mutex);
1579 return ret;
1580}
1581
1582static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1583{
1584 struct se_portal_group *se_tpg;
1585 struct tcm_usbg_nexus *tv_nexus;
1586 int ret;
1587
1588 mutex_lock(&tpg->tpg_mutex);
1589 if (tpg->tpg_nexus) {
1590 ret = -EEXIST;
1591 pr_debug("tpg->tpg_nexus already exists\n");
1592 goto err_unlock;
1593 }
1594 se_tpg = &tpg->se_tpg;
1595
1596 ret = -ENOMEM;
1597 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1598 if (!tv_nexus)
1599 goto err_unlock;
1600 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1601 if (IS_ERR(tv_nexus->tvn_se_sess))
1602 goto err_free;
1603
1604 /*
1605 * Since we are running in 'demo mode' this call with generate a
1606 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1607 * the SCSI Initiator port name of the passed configfs group 'name'.
1608 */
1609 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1610 se_tpg, name);
1611 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1612#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1613 pr_debug(MAKE_NEXUS_MSG, name);
1614#undef MAKE_NEXUS_MSG
1615 goto err_session;
1616 }
1617 /*
1618 * Now register the TCM vHost virtual I_T Nexus as active.
1619 */
1620 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1621 tv_nexus->tvn_se_sess, tv_nexus);
1622 tpg->tpg_nexus = tv_nexus;
1623 mutex_unlock(&tpg->tpg_mutex);
1624 return 0;
1625
1626err_session:
1627 transport_free_session(tv_nexus->tvn_se_sess);
1628err_free:
1629 kfree(tv_nexus);
1630err_unlock:
1631 mutex_unlock(&tpg->tpg_mutex);
1632 return ret;
1633}
1634
1635static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1636{
1637 struct se_session *se_sess;
1638 struct tcm_usbg_nexus *tv_nexus;
1639 int ret = -ENODEV;
1640
1641 mutex_lock(&tpg->tpg_mutex);
1642 tv_nexus = tpg->tpg_nexus;
1643 if (!tv_nexus)
1644 goto out;
1645
1646 se_sess = tv_nexus->tvn_se_sess;
1647 if (!se_sess)
1648 goto out;
1649
1650 if (atomic_read(&tpg->tpg_port_count)) {
1651 ret = -EPERM;
1652#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1653 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1654#undef MSG
1655 goto out;
1656 }
1657
1658 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1659 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1660 /*
1661 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1662 */
1663 transport_deregister_session(tv_nexus->tvn_se_sess);
1664 tpg->tpg_nexus = NULL;
1665
1666 kfree(tv_nexus);
1667 ret = 0;
1668out:
1669 mutex_unlock(&tpg->tpg_mutex);
1670 return ret;
1671}
1672
1673static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1674 const char *page, size_t count)
1675{
1676 struct se_portal_group *se_tpg = to_tpg(item);
1677 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1678 unsigned char i_port[USBG_NAMELEN], *ptr;
1679 int ret;
1680
1681 if (!strncmp(page, "NULL", 4)) {
1682 ret = tcm_usbg_drop_nexus(tpg);
1683 return (!ret) ? count : ret;
1684 }
1685 if (strlen(page) >= USBG_NAMELEN) {
1686
1687#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1688 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1689#undef NEXUS_STORE_MSG
1690 return -EINVAL;
1691 }
1692 snprintf(i_port, USBG_NAMELEN, "%s", page);
1693
1694 ptr = strstr(i_port, "naa.");
1695 if (!ptr) {
1696 pr_err("Missing 'naa.' prefix\n");
1697 return -EINVAL;
1698 }
1699
1700 if (i_port[strlen(i_port) - 1] == '\n')
1701 i_port[strlen(i_port) - 1] = '\0';
1702
1703 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1704 if (ret < 0)
1705 return ret;
1706 return count;
1707}
1708
1709CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1710CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1711
1712static struct configfs_attribute *usbg_base_attrs[] = {
1713 &tcm_usbg_tpg_attr_enable,
1714 &tcm_usbg_tpg_attr_nexus,
1715 NULL,
1716};
1717
1718static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1719{
1720 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1721
1722 atomic_inc(&tpg->tpg_port_count);
1723 smp_mb__after_atomic();
1724 return 0;
1725}
1726
1727static void usbg_port_unlink(struct se_portal_group *se_tpg,
1728 struct se_lun *se_lun)
1729{
1730 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1731
1732 atomic_dec(&tpg->tpg_port_count);
1733 smp_mb__after_atomic();
1734}
1735
1736static int usbg_check_stop_free(struct se_cmd *se_cmd)
1737{
1738 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1739 se_cmd);
1740
1741 kref_put(&cmd->ref, usbg_cmd_release);
1742 return 1;
1743}
1744
1745static const struct target_core_fabric_ops usbg_ops = {
1746 .module = THIS_MODULE,
1747 .name = "usb_gadget",
1748 .get_fabric_name = usbg_get_fabric_name,
1749 .tpg_get_wwn = usbg_get_fabric_wwn,
1750 .tpg_get_tag = usbg_get_tag,
1751 .tpg_check_demo_mode = usbg_check_true,
1752 .tpg_check_demo_mode_cache = usbg_check_false,
1753 .tpg_check_demo_mode_write_protect = usbg_check_false,
1754 .tpg_check_prod_mode_write_protect = usbg_check_false,
1755 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1756 .release_cmd = usbg_release_cmd,
1757 .shutdown_session = usbg_shutdown_session,
1758 .close_session = usbg_close_session,
1759 .sess_get_index = usbg_sess_get_index,
1760 .sess_get_initiator_sid = NULL,
1761 .write_pending = usbg_send_write_request,
1762 .write_pending_status = usbg_write_pending_status,
1763 .set_default_node_attributes = usbg_set_default_node_attrs,
1764 .get_cmd_state = usbg_get_cmd_state,
1765 .queue_data_in = usbg_send_read_response,
1766 .queue_status = usbg_send_status_response,
1767 .queue_tm_rsp = usbg_queue_tm_rsp,
1768 .aborted_task = usbg_aborted_task,
1769 .check_stop_free = usbg_check_stop_free,
1770
1771 .fabric_make_wwn = usbg_make_tport,
1772 .fabric_drop_wwn = usbg_drop_tport,
1773 .fabric_make_tpg = usbg_make_tpg,
1774 .fabric_drop_tpg = usbg_drop_tpg,
1775 .fabric_post_link = usbg_port_link,
1776 .fabric_pre_unlink = usbg_port_unlink,
1777 .fabric_init_nodeacl = usbg_init_nodeacl,
1778
1779 .tfc_wwn_attrs = usbg_wwn_attrs,
1780 .tfc_tpg_base_attrs = usbg_base_attrs,
1781};
1782
1783/* Start gadget.c code */
1784
1785static struct usb_interface_descriptor bot_intf_desc = {
1786 .bLength = sizeof(bot_intf_desc),
1787 .bDescriptorType = USB_DT_INTERFACE,
1788 .bNumEndpoints = 2,
1789 .bAlternateSetting = USB_G_ALT_INT_BBB,
1790 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1791 .bInterfaceSubClass = USB_SC_SCSI,
1792 .bInterfaceProtocol = USB_PR_BULK,
1793};
1794
1795static struct usb_interface_descriptor uasp_intf_desc = {
1796 .bLength = sizeof(uasp_intf_desc),
1797 .bDescriptorType = USB_DT_INTERFACE,
1798 .bNumEndpoints = 4,
1799 .bAlternateSetting = USB_G_ALT_INT_UAS,
1800 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1801 .bInterfaceSubClass = USB_SC_SCSI,
1802 .bInterfaceProtocol = USB_PR_UAS,
1803};
1804
1805static struct usb_endpoint_descriptor uasp_bi_desc = {
1806 .bLength = USB_DT_ENDPOINT_SIZE,
1807 .bDescriptorType = USB_DT_ENDPOINT,
1808 .bEndpointAddress = USB_DIR_IN,
1809 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1810 .wMaxPacketSize = cpu_to_le16(512),
1811};
1812
1813static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1814 .bLength = USB_DT_ENDPOINT_SIZE,
1815 .bDescriptorType = USB_DT_ENDPOINT,
1816 .bEndpointAddress = USB_DIR_IN,
1817 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1818};
1819
1820static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1821 .bLength = sizeof(uasp_bi_pipe_desc),
1822 .bDescriptorType = USB_DT_PIPE_USAGE,
1823 .bPipeID = DATA_IN_PIPE_ID,
1824};
1825
1826static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1827 .bLength = USB_DT_ENDPOINT_SIZE,
1828 .bDescriptorType = USB_DT_ENDPOINT,
1829 .bEndpointAddress = USB_DIR_IN,
1830 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1831 .wMaxPacketSize = cpu_to_le16(1024),
1832};
1833
1834static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1835 .bLength = sizeof(uasp_bi_ep_comp_desc),
1836 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1837 .bMaxBurst = 0,
1838 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1839 .wBytesPerInterval = 0,
1840};
1841
1842static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1843 .bLength = sizeof(bot_bi_ep_comp_desc),
1844 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1845 .bMaxBurst = 0,
1846};
1847
1848static struct usb_endpoint_descriptor uasp_bo_desc = {
1849 .bLength = USB_DT_ENDPOINT_SIZE,
1850 .bDescriptorType = USB_DT_ENDPOINT,
1851 .bEndpointAddress = USB_DIR_OUT,
1852 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1853 .wMaxPacketSize = cpu_to_le16(512),
1854};
1855
1856static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1857 .bLength = USB_DT_ENDPOINT_SIZE,
1858 .bDescriptorType = USB_DT_ENDPOINT,
1859 .bEndpointAddress = USB_DIR_OUT,
1860 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1861};
1862
1863static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1864 .bLength = sizeof(uasp_bo_pipe_desc),
1865 .bDescriptorType = USB_DT_PIPE_USAGE,
1866 .bPipeID = DATA_OUT_PIPE_ID,
1867};
1868
1869static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1870 .bLength = USB_DT_ENDPOINT_SIZE,
1871 .bDescriptorType = USB_DT_ENDPOINT,
1872 .bEndpointAddress = USB_DIR_OUT,
1873 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1874 .wMaxPacketSize = cpu_to_le16(0x400),
1875};
1876
1877static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1878 .bLength = sizeof(uasp_bo_ep_comp_desc),
1879 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1880 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1881};
1882
1883static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1884 .bLength = sizeof(bot_bo_ep_comp_desc),
1885 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1886};
1887
1888static struct usb_endpoint_descriptor uasp_status_desc = {
1889 .bLength = USB_DT_ENDPOINT_SIZE,
1890 .bDescriptorType = USB_DT_ENDPOINT,
1891 .bEndpointAddress = USB_DIR_IN,
1892 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1893 .wMaxPacketSize = cpu_to_le16(512),
1894};
1895
1896static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1897 .bLength = USB_DT_ENDPOINT_SIZE,
1898 .bDescriptorType = USB_DT_ENDPOINT,
1899 .bEndpointAddress = USB_DIR_IN,
1900 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1901};
1902
1903static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1904 .bLength = sizeof(uasp_status_pipe_desc),
1905 .bDescriptorType = USB_DT_PIPE_USAGE,
1906 .bPipeID = STATUS_PIPE_ID,
1907};
1908
1909static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1910 .bLength = USB_DT_ENDPOINT_SIZE,
1911 .bDescriptorType = USB_DT_ENDPOINT,
1912 .bEndpointAddress = USB_DIR_IN,
1913 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1914 .wMaxPacketSize = cpu_to_le16(1024),
1915};
1916
1917static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1918 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1919 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1920 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1921};
1922
1923static struct usb_endpoint_descriptor uasp_cmd_desc = {
1924 .bLength = USB_DT_ENDPOINT_SIZE,
1925 .bDescriptorType = USB_DT_ENDPOINT,
1926 .bEndpointAddress = USB_DIR_OUT,
1927 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1928 .wMaxPacketSize = cpu_to_le16(512),
1929};
1930
1931static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1932 .bLength = USB_DT_ENDPOINT_SIZE,
1933 .bDescriptorType = USB_DT_ENDPOINT,
1934 .bEndpointAddress = USB_DIR_OUT,
1935 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1936};
1937
1938static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1939 .bLength = sizeof(uasp_cmd_pipe_desc),
1940 .bDescriptorType = USB_DT_PIPE_USAGE,
1941 .bPipeID = CMD_PIPE_ID,
1942};
1943
1944static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1945 .bLength = USB_DT_ENDPOINT_SIZE,
1946 .bDescriptorType = USB_DT_ENDPOINT,
1947 .bEndpointAddress = USB_DIR_OUT,
1948 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1949 .wMaxPacketSize = cpu_to_le16(1024),
1950};
1951
1952static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1953 .bLength = sizeof(uasp_cmd_comp_desc),
1954 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1955};
1956
1957static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1958 (struct usb_descriptor_header *) &bot_intf_desc,
1959 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1960 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1961
1962 (struct usb_descriptor_header *) &uasp_intf_desc,
1963 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1964 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1965 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1966 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1967 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1968 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1969 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1970 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1971 NULL,
1972};
1973
1974static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1975 (struct usb_descriptor_header *) &bot_intf_desc,
1976 (struct usb_descriptor_header *) &uasp_bi_desc,
1977 (struct usb_descriptor_header *) &uasp_bo_desc,
1978
1979 (struct usb_descriptor_header *) &uasp_intf_desc,
1980 (struct usb_descriptor_header *) &uasp_bi_desc,
1981 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1982 (struct usb_descriptor_header *) &uasp_bo_desc,
1983 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1984 (struct usb_descriptor_header *) &uasp_status_desc,
1985 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1986 (struct usb_descriptor_header *) &uasp_cmd_desc,
1987 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1988 NULL,
1989};
1990
1991static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1992 (struct usb_descriptor_header *) &bot_intf_desc,
1993 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1994 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1995 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1996 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1997
1998 (struct usb_descriptor_header *) &uasp_intf_desc,
1999 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2000 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2001 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2002 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2003 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2004 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2005 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2006 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2007 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2008 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2009 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2010 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2011 NULL,
2012};
2013
2014static struct usb_string tcm_us_strings[] = {
2015 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
2016 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
2017 { },
2018};
2019
2020static struct usb_gadget_strings tcm_stringtab = {
2021 .language = 0x0409,
2022 .strings = tcm_us_strings,
2023};
2024
2025static struct usb_gadget_strings *tcm_strings[] = {
2026 &tcm_stringtab,
2027 NULL,
2028};
2029
2030static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
2031{
2032 struct f_uas *fu = to_f_uas(f);
9beab5d4 2033 struct usb_string *us;
08a1cb0f
AP		 2034 struct usb_gadget *gadget = c->cdev->gadget;
2035 struct usb_ep *ep;
dc8c46a5 2036 struct f_tcm_opts *opts;
08a1cb0f
AP		 2037 int iface;
2038 int ret;
2039
dc8c46a5
AP		 2040 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2041
2042 mutex_lock(&opts->dep_lock);
2043 if (!opts->can_attach) {
2044 mutex_unlock(&opts->dep_lock);
2045 return -ENODEV;
2046 }
2047 mutex_unlock(&opts->dep_lock);
9beab5d4
AP		 2048 us = usb_gstrings_attach(c->cdev, tcm_strings,
2049 ARRAY_SIZE(tcm_us_strings));
2050 if (IS_ERR(us))
2051 return PTR_ERR(us);
2052 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2053 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
dc8c46a5 2054
08a1cb0f
AP		 2055 iface = usb_interface_id(c, f);
2056 if (iface < 0)
2057 return iface;
2058
2059 bot_intf_desc.bInterfaceNumber = iface;
2060 uasp_intf_desc.bInterfaceNumber = iface;
2061 fu->iface = iface;
2062 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2063 &uasp_bi_ep_comp_desc);
2064 if (!ep)
2065 goto ep_fail;
2066
2067 fu->ep_in = ep;
2068
2069 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2070 &uasp_bo_ep_comp_desc);
2071 if (!ep)
2072 goto ep_fail;
2073 fu->ep_out = ep;
2074
2075 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2076 &uasp_status_in_ep_comp_desc);
2077 if (!ep)
2078 goto ep_fail;
2079 fu->ep_status = ep;
2080
2081 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2082 &uasp_cmd_comp_desc);
2083 if (!ep)
2084 goto ep_fail;
2085 fu->ep_cmd = ep;
2086
2087 /* Assume endpoint addresses are the same for both speeds */
2088 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2089 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2090 uasp_status_desc.bEndpointAddress =
2091 uasp_ss_status_desc.bEndpointAddress;
2092 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2093
2094 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2095 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2096 uasp_fs_status_desc.bEndpointAddress =
2097 uasp_ss_status_desc.bEndpointAddress;
2098 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2099
2100 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2101 uasp_hs_function_desc, uasp_ss_function_desc);
2102 if (ret)
2103 goto ep_fail;
2104
2105 return 0;
2106ep_fail:
2107 pr_err("Can't claim all required eps\n");
2108
2109 return -ENOTSUPP;
2110}
2111
08a1cb0f
AP		 2112struct guas_setup_wq {
2113 struct work_struct work;
2114 struct f_uas *fu;
2115 unsigned int alt;
2116};
2117
2118static void tcm_delayed_set_alt(struct work_struct *wq)
2119{
2120 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2121 work);
2122 struct f_uas *fu = work->fu;
2123 int alt = work->alt;
2124
2125 kfree(work);
2126
2127 if (fu->flags & USBG_IS_BOT)
2128 bot_cleanup_old_alt(fu);
2129 if (fu->flags & USBG_IS_UAS)
2130 uasp_cleanup_old_alt(fu);
2131
2132 if (alt == USB_G_ALT_INT_BBB)
2133 bot_set_alt(fu);
2134 else if (alt == USB_G_ALT_INT_UAS)
2135 uasp_set_alt(fu);
2136 usb_composite_setup_continue(fu->function.config->cdev);
2137}
2138
2139static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2140{
2141 struct f_uas *fu = to_f_uas(f);
2142
2143 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2144 struct guas_setup_wq *work;
2145
2146 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2147 if (!work)
2148 return -ENOMEM;
2149 INIT_WORK(&work->work, tcm_delayed_set_alt);
2150 work->fu = fu;
2151 work->alt = alt;
2152 schedule_work(&work->work);
2153 return USB_GADGET_DELAYED_STATUS;
2154 }
2155 return -EOPNOTSUPP;
2156}
2157
2158static void tcm_disable(struct usb_function *f)
2159{
2160 struct f_uas *fu = to_f_uas(f);
2161
2162 if (fu->flags & USBG_IS_UAS)
2163 uasp_cleanup_old_alt(fu);
2164 else if (fu->flags & USBG_IS_BOT)
2165 bot_cleanup_old_alt(fu);
2166 fu->flags = 0;
2167}
2168
2169static int tcm_setup(struct usb_function *f,
2170 const struct usb_ctrlrequest *ctrl)
2171{
2172 struct f_uas *fu = to_f_uas(f);
2173
2174 if (!(fu->flags & USBG_IS_BOT))
2175 return -EOPNOTSUPP;
2176
2177 return usbg_bot_setup(f, ctrl);
2178}
2179
4bb8548d
AP		 2180static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2181{
2182 return container_of(to_config_group(item), struct f_tcm_opts,
2183 func_inst.group);
2184}
2185
2186static void tcm_attr_release(struct config_item *item)
2187{
2188 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2189
2190 usb_put_function_instance(&opts->func_inst);
2191}
2192
2193static struct configfs_item_operations tcm_item_ops = {
2194 .release = tcm_attr_release,
2195};
2196
2197static struct config_item_type tcm_func_type = {
2198 .ct_item_ops = &tcm_item_ops,
2199 .ct_owner = THIS_MODULE,
2200};
2201
dc8c46a5
AP		 2202static void tcm_free_inst(struct usb_function_instance *f)
2203{
2204 struct f_tcm_opts *opts;
2205 unsigned i;
2206
2207 opts = container_of(f, struct f_tcm_opts, func_inst);
2208
2209 mutex_lock(&tpg_instances_lock);
2210 for (i = 0; i < TPG_INSTANCES; ++i)
2211 if (tpg_instances[i].func_inst == f)
2212 break;
2213 if (i < TPG_INSTANCES)
2214 tpg_instances[i].func_inst = NULL;
2215 mutex_unlock(&tpg_instances_lock);
2216
2217 kfree(opts);
2218}
2219
4bb8548d
AP		 2220static int tcm_register_callback(struct usb_function_instance *f)
2221{
2222 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2223
2224 mutex_lock(&opts->dep_lock);
2225 opts->can_attach = true;
2226 mutex_unlock(&opts->dep_lock);
2227
2228 return 0;
2229}
2230
2231static void tcm_unregister_callback(struct usb_function_instance *f)
2232{
2233 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2234
2235 mutex_lock(&opts->dep_lock);
2236 unregister_gadget_item(opts->
2237 func_inst.group.cg_item.ci_parent->ci_parent);
2238 opts->can_attach = false;
2239 mutex_unlock(&opts->dep_lock);
2240}
2241
dc8c46a5
AP		 2242static int usbg_attach(struct usbg_tpg *tpg)
2243{
2244 struct usb_function_instance *f = tpg->fi;
2245 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2246
2247 if (opts->tcm_register_callback)
2248 return opts->tcm_register_callback(f);
2249
2250 return 0;
2251}
2252
2253static void usbg_detach(struct usbg_tpg *tpg)
2254{
2255 struct usb_function_instance *f = tpg->fi;
2256 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2257
2258 if (opts->tcm_unregister_callback)
2259 opts->tcm_unregister_callback(f);
2260}
2261
2262static int tcm_set_name(struct usb_function_instance *f, const char *name)
2263{
2264 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2265
2266 pr_debug("tcm: Activating %s\n", name);
2267
2268 mutex_lock(&opts->dep_lock);
2269 opts->ready = true;
2270 mutex_unlock(&opts->dep_lock);
2271
2272 return 0;
2273}
2274
2275static struct usb_function_instance *tcm_alloc_inst(void)
2276{
2277 struct f_tcm_opts *opts;
2278 int i;
2279
2280
2281 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2282 if (!opts)
2283 return ERR_PTR(-ENOMEM);
2284
2285 mutex_lock(&tpg_instances_lock);
2286 for (i = 0; i < TPG_INSTANCES; ++i)
2287 if (!tpg_instances[i].func_inst)
2288 break;
2289
2290 if (i == TPG_INSTANCES) {
2291 mutex_unlock(&tpg_instances_lock);
2292 kfree(opts);
2293 return ERR_PTR(-EBUSY);
2294 }
2295 tpg_instances[i].func_inst = &opts->func_inst;
2296 mutex_unlock(&tpg_instances_lock);
2297
2298 mutex_init(&opts->dep_lock);
2299 opts->func_inst.set_inst_name = tcm_set_name;
2300 opts->func_inst.free_func_inst = tcm_free_inst;
4bb8548d
AP		 2301 opts->tcm_register_callback = tcm_register_callback;
2302 opts->tcm_unregister_callback = tcm_unregister_callback;
2303
2304 config_group_init_type_name(&opts->func_inst.group, "",
2305 &tcm_func_type);
dc8c46a5
AP		 2306
2307 return &opts->func_inst;
2308}
2309
2310static void tcm_free(struct usb_function *f)
2311{
2312 struct f_uas *tcm = to_f_uas(f);
2313
2314 kfree(tcm);
2315}
2316
2317static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2318{
2319 usb_free_all_descriptors(f);
2320}
2321
2322static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2323{
2324 struct f_uas *fu;
dc8c46a5
AP		 2325 unsigned i;
2326
2327 mutex_lock(&tpg_instances_lock);
2328 for (i = 0; i < TPG_INSTANCES; ++i)
2329 if (tpg_instances[i].func_inst == fi)
2330 break;
2331 if (i == TPG_INSTANCES) {
2332 mutex_unlock(&tpg_instances_lock);
2333 return ERR_PTR(-ENODEV);
2334 }
2335
dc8c46a5
AP		 2336 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2337 if (!fu) {
2338 mutex_unlock(&tpg_instances_lock);
2339 return ERR_PTR(-ENOMEM);
2340 }
2341
2342 fu->function.name = "Target Function";
2343 fu->function.bind = tcm_bind;
2344 fu->function.unbind = tcm_unbind;
2345 fu->function.set_alt = tcm_set_alt;
2346 fu->function.setup = tcm_setup;
2347 fu->function.disable = tcm_disable;
dc8c46a5
AP		 2348 fu->function.free_func = tcm_free;
2349 fu->tpg = tpg_instances[i].tpg;
2350 mutex_unlock(&tpg_instances_lock);
2351
2352 return &fu->function;
2353}
2354
2355DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2356
2357static int tcm_init(void)
2358{
2359 int ret;
2360
2361 ret = usb_function_register(&tcmusb_func);
2362 if (ret)
2363 return ret;
2364
2365 ret = target_register_template(&usbg_ops);
2366 if (ret)
2367 usb_function_unregister(&tcmusb_func);
2368
2369 return ret;
2370}
2371module_init(tcm_init);
2372
2373static void tcm_exit(void)
2374{
2375 target_unregister_template(&usbg_ops);
2376 usb_function_unregister(&tcmusb_func);
2377}
2378module_exit(tcm_exit);
2379
2380MODULE_LICENSE("GPL");
2381MODULE_AUTHOR("Sebastian Andrzej Siewior");
Linux kernel - Deliverables
This page took 0.142722 seconds and 5 git commands to generate.