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 <linux/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
to_f_uas(struct usb_function * f)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
bot_enqueue_cmd_cbw(struct f_uas * fu)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
bot_status_complete(struct usb_ep * ep,struct usb_request * req)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
bot_enqueue_sense_code(struct f_uas * fu,struct usbg_cmd * cmd)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
bot_err_compl(struct usb_ep * ep,struct usb_request * req)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
bot_send_bad_status(struct usbg_cmd * cmd)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
bot_send_status(struct usbg_cmd * cmd,bool moved_data)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 */
bot_send_status_response(struct usbg_cmd * cmd)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 */
bot_read_compl(struct usb_ep * ep,struct usb_request * req)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
bot_send_read_response(struct usbg_cmd * cmd)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
bot_send_write_request(struct usbg_cmd * cmd)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
bot_cmd_complete(struct usb_ep * ep,struct usb_request * req)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
bot_prepare_reqs(struct f_uas * fu)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
bot_cleanup_old_alt(struct f_uas * fu)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
bot_set_alt(struct f_uas * fu)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_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB);
396 ret = usb_ep_enable(fu->ep_in);
397 if (ret)
398 goto err_b_in;
399
400 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB);
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
usbg_bot_setup(struct usb_function * f,const struct usb_ctrlrequest * ctrl)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
uasp_cleanup_one_stream(struct f_uas * fu,struct uas_stream * stream)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
uasp_free_cmdreq(struct f_uas * fu)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
uasp_cleanup_old_alt(struct f_uas * fu)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
uasp_prepare_r_request(struct usbg_cmd * cmd)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->is_last = 1;
535 stream->req_in->complete = uasp_status_data_cmpl;
536 stream->req_in->length = se_cmd->data_length;
537 stream->req_in->context = cmd;
538
539 cmd->state = UASP_SEND_STATUS;
540 return 0;
541 }
542
uasp_prepare_status(struct usbg_cmd * cmd)543 static void uasp_prepare_status(struct usbg_cmd *cmd)
544 {
545 struct se_cmd *se_cmd = &cmd->se_cmd;
546 struct sense_iu *iu = &cmd->sense_iu;
547 struct uas_stream *stream = cmd->stream;
548
549 cmd->state = UASP_QUEUE_COMMAND;
550 iu->iu_id = IU_ID_STATUS;
551 iu->tag = cpu_to_be16(cmd->tag);
552
553 /*
554 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
555 */
556 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
557 iu->status = se_cmd->scsi_status;
558 stream->req_status->is_last = 1;
559 stream->req_status->context = cmd;
560 stream->req_status->length = se_cmd->scsi_sense_length + 16;
561 stream->req_status->buf = iu;
562 stream->req_status->complete = uasp_status_data_cmpl;
563 }
564
uasp_status_data_cmpl(struct usb_ep * ep,struct usb_request * req)565 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
566 {
567 struct usbg_cmd *cmd = req->context;
568 struct uas_stream *stream = cmd->stream;
569 struct f_uas *fu = cmd->fu;
570 int ret;
571
572 if (req->status < 0)
573 goto cleanup;
574
575 switch (cmd->state) {
576 case UASP_SEND_DATA:
577 ret = uasp_prepare_r_request(cmd);
578 if (ret)
579 goto cleanup;
580 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
581 if (ret)
582 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
583 break;
584
585 case UASP_RECEIVE_DATA:
586 ret = usbg_prepare_w_request(cmd, stream->req_out);
587 if (ret)
588 goto cleanup;
589 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
590 if (ret)
591 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
592 break;
593
594 case UASP_SEND_STATUS:
595 uasp_prepare_status(cmd);
596 ret = usb_ep_queue(fu->ep_status, stream->req_status,
597 GFP_ATOMIC);
598 if (ret)
599 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
600 break;
601
602 case UASP_QUEUE_COMMAND:
603 transport_generic_free_cmd(&cmd->se_cmd, 0);
604 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
605 break;
606
607 default:
608 BUG();
609 }
610 return;
611
612 cleanup:
613 transport_generic_free_cmd(&cmd->se_cmd, 0);
614 }
615
uasp_send_status_response(struct usbg_cmd * cmd)616 static int uasp_send_status_response(struct usbg_cmd *cmd)
617 {
618 struct f_uas *fu = cmd->fu;
619 struct uas_stream *stream = cmd->stream;
620 struct sense_iu *iu = &cmd->sense_iu;
621
622 iu->tag = cpu_to_be16(cmd->tag);
623 stream->req_status->complete = uasp_status_data_cmpl;
624 stream->req_status->context = cmd;
625 cmd->fu = fu;
626 uasp_prepare_status(cmd);
627 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
628 }
629
uasp_send_read_response(struct usbg_cmd * cmd)630 static int uasp_send_read_response(struct usbg_cmd *cmd)
631 {
632 struct f_uas *fu = cmd->fu;
633 struct uas_stream *stream = cmd->stream;
634 struct sense_iu *iu = &cmd->sense_iu;
635 int ret;
636
637 cmd->fu = fu;
638
639 iu->tag = cpu_to_be16(cmd->tag);
640 if (fu->flags & USBG_USE_STREAMS) {
641
642 ret = uasp_prepare_r_request(cmd);
643 if (ret)
644 goto out;
645 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
646 if (ret) {
647 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
648 kfree(cmd->data_buf);
649 cmd->data_buf = NULL;
650 }
651
652 } else {
653
654 iu->iu_id = IU_ID_READ_READY;
655 iu->tag = cpu_to_be16(cmd->tag);
656
657 stream->req_status->complete = uasp_status_data_cmpl;
658 stream->req_status->context = cmd;
659
660 cmd->state = UASP_SEND_DATA;
661 stream->req_status->buf = iu;
662 stream->req_status->length = sizeof(struct iu);
663
664 ret = usb_ep_queue(fu->ep_status, stream->req_status,
665 GFP_ATOMIC);
666 if (ret)
667 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
668 }
669 out:
670 return ret;
671 }
672
uasp_send_write_request(struct usbg_cmd * cmd)673 static int uasp_send_write_request(struct usbg_cmd *cmd)
674 {
675 struct f_uas *fu = cmd->fu;
676 struct se_cmd *se_cmd = &cmd->se_cmd;
677 struct uas_stream *stream = cmd->stream;
678 struct sense_iu *iu = &cmd->sense_iu;
679 int ret;
680
681 init_completion(&cmd->write_complete);
682 cmd->fu = fu;
683
684 iu->tag = cpu_to_be16(cmd->tag);
685
686 if (fu->flags & USBG_USE_STREAMS) {
687
688 ret = usbg_prepare_w_request(cmd, stream->req_out);
689 if (ret)
690 goto cleanup;
691 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
692 if (ret)
693 pr_err("%s(%d)\n", __func__, __LINE__);
694
695 } else {
696
697 iu->iu_id = IU_ID_WRITE_READY;
698 iu->tag = cpu_to_be16(cmd->tag);
699
700 stream->req_status->complete = uasp_status_data_cmpl;
701 stream->req_status->context = cmd;
702
703 cmd->state = UASP_RECEIVE_DATA;
704 stream->req_status->buf = iu;
705 stream->req_status->length = sizeof(struct iu);
706
707 ret = usb_ep_queue(fu->ep_status, stream->req_status,
708 GFP_ATOMIC);
709 if (ret)
710 pr_err("%s(%d)\n", __func__, __LINE__);
711 }
712
713 wait_for_completion(&cmd->write_complete);
714 target_execute_cmd(se_cmd);
715 cleanup:
716 return ret;
717 }
718
719 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
720
uasp_cmd_complete(struct usb_ep * ep,struct usb_request * req)721 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
722 {
723 struct f_uas *fu = req->context;
724 int ret;
725
726 if (req->status < 0)
727 return;
728
729 ret = usbg_submit_command(fu, req->buf, req->actual);
730 /*
731 * Once we tune for performance enqueue the command req here again so
732 * we can receive a second command while we processing this one. Pay
733 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
734 * don't break HS.
735 */
736 if (!ret)
737 return;
738 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
739 }
740
uasp_alloc_stream_res(struct f_uas * fu,struct uas_stream * stream)741 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
742 {
743 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
744 if (!stream->req_in)
745 goto out;
746
747 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
748 if (!stream->req_out)
749 goto err_out;
750
751 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
752 if (!stream->req_status)
753 goto err_sts;
754
755 return 0;
756
757 err_sts:
758 usb_ep_free_request(fu->ep_out, stream->req_out);
759 stream->req_out = NULL;
760 err_out:
761 usb_ep_free_request(fu->ep_in, stream->req_in);
762 stream->req_in = NULL;
763 out:
764 return -ENOMEM;
765 }
766
uasp_alloc_cmd(struct f_uas * fu)767 static int uasp_alloc_cmd(struct f_uas *fu)
768 {
769 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
770 if (!fu->cmd.req)
771 goto err;
772
773 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
774 if (!fu->cmd.buf)
775 goto err_buf;
776
777 fu->cmd.req->complete = uasp_cmd_complete;
778 fu->cmd.req->buf = fu->cmd.buf;
779 fu->cmd.req->length = fu->ep_cmd->maxpacket;
780 fu->cmd.req->context = fu;
781 return 0;
782
783 err_buf:
784 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
785 err:
786 return -ENOMEM;
787 }
788
uasp_setup_stream_res(struct f_uas * fu,int max_streams)789 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
790 {
791 int i;
792
793 for (i = 0; i < max_streams; i++) {
794 struct uas_stream *s = &fu->stream[i];
795
796 s->req_in->stream_id = i + 1;
797 s->req_out->stream_id = i + 1;
798 s->req_status->stream_id = i + 1;
799 }
800 }
801
uasp_prepare_reqs(struct f_uas * fu)802 static int uasp_prepare_reqs(struct f_uas *fu)
803 {
804 int ret;
805 int i;
806 int max_streams;
807
808 if (fu->flags & USBG_USE_STREAMS)
809 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
810 else
811 max_streams = 1;
812
813 for (i = 0; i < max_streams; i++) {
814 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
815 if (ret)
816 goto err_cleanup;
817 }
818
819 ret = uasp_alloc_cmd(fu);
820 if (ret)
821 goto err_free_stream;
822 uasp_setup_stream_res(fu, max_streams);
823
824 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
825 if (ret)
826 goto err_free_stream;
827
828 return 0;
829
830 err_free_stream:
831 uasp_free_cmdreq(fu);
832
833 err_cleanup:
834 if (i) {
835 do {
836 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
837 i--;
838 } while (i);
839 }
840 pr_err("UASP: endpoint setup failed\n");
841 return ret;
842 }
843
uasp_set_alt(struct f_uas * fu)844 static void uasp_set_alt(struct f_uas *fu)
845 {
846 struct usb_function *f = &fu->function;
847 struct usb_gadget *gadget = f->config->cdev->gadget;
848 int ret;
849
850 fu->flags = USBG_IS_UAS;
851
852 if (gadget->speed >= USB_SPEED_SUPER)
853 fu->flags |= USBG_USE_STREAMS;
854
855 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS);
856 ret = usb_ep_enable(fu->ep_in);
857 if (ret)
858 goto err_b_in;
859
860 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS);
861 ret = usb_ep_enable(fu->ep_out);
862 if (ret)
863 goto err_b_out;
864
865 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS);
866 ret = usb_ep_enable(fu->ep_cmd);
867 if (ret)
868 goto err_cmd;
869 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS);
870 ret = usb_ep_enable(fu->ep_status);
871 if (ret)
872 goto err_status;
873
874 ret = uasp_prepare_reqs(fu);
875 if (ret)
876 goto err_wq;
877 fu->flags |= USBG_ENABLED;
878
879 pr_info("Using the UAS protocol\n");
880 return;
881 err_wq:
882 usb_ep_disable(fu->ep_status);
883 err_status:
884 usb_ep_disable(fu->ep_cmd);
885 err_cmd:
886 usb_ep_disable(fu->ep_out);
887 err_b_out:
888 usb_ep_disable(fu->ep_in);
889 err_b_in:
890 fu->flags = 0;
891 }
892
get_cmd_dir(const unsigned char * cdb)893 static int get_cmd_dir(const unsigned char *cdb)
894 {
895 int ret;
896
897 switch (cdb[0]) {
898 case READ_6:
899 case READ_10:
900 case READ_12:
901 case READ_16:
902 case INQUIRY:
903 case MODE_SENSE:
904 case MODE_SENSE_10:
905 case SERVICE_ACTION_IN_16:
906 case MAINTENANCE_IN:
907 case PERSISTENT_RESERVE_IN:
908 case SECURITY_PROTOCOL_IN:
909 case ACCESS_CONTROL_IN:
910 case REPORT_LUNS:
911 case READ_BLOCK_LIMITS:
912 case READ_POSITION:
913 case READ_CAPACITY:
914 case READ_TOC:
915 case READ_FORMAT_CAPACITIES:
916 case REQUEST_SENSE:
917 ret = DMA_FROM_DEVICE;
918 break;
919
920 case WRITE_6:
921 case WRITE_10:
922 case WRITE_12:
923 case WRITE_16:
924 case MODE_SELECT:
925 case MODE_SELECT_10:
926 case WRITE_VERIFY:
927 case WRITE_VERIFY_12:
928 case PERSISTENT_RESERVE_OUT:
929 case MAINTENANCE_OUT:
930 case SECURITY_PROTOCOL_OUT:
931 case ACCESS_CONTROL_OUT:
932 ret = DMA_TO_DEVICE;
933 break;
934 case ALLOW_MEDIUM_REMOVAL:
935 case TEST_UNIT_READY:
936 case SYNCHRONIZE_CACHE:
937 case START_STOP:
938 case ERASE:
939 case REZERO_UNIT:
940 case SEEK_10:
941 case SPACE:
942 case VERIFY:
943 case WRITE_FILEMARKS:
944 ret = DMA_NONE;
945 break;
946 default:
947 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
948 pr_warn(CMD_DIR_MSG, cdb[0]);
949 #undef CMD_DIR_MSG
950 ret = -EINVAL;
951 }
952 return ret;
953 }
954
usbg_data_write_cmpl(struct usb_ep * ep,struct usb_request * req)955 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
956 {
957 struct usbg_cmd *cmd = req->context;
958 struct se_cmd *se_cmd = &cmd->se_cmd;
959
960 if (req->status < 0) {
961 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
962 goto cleanup;
963 }
964
965 if (req->num_sgs == 0) {
966 sg_copy_from_buffer(se_cmd->t_data_sg,
967 se_cmd->t_data_nents,
968 cmd->data_buf,
969 se_cmd->data_length);
970 }
971
972 complete(&cmd->write_complete);
973 return;
974
975 cleanup:
976 transport_generic_free_cmd(&cmd->se_cmd, 0);
977 }
978
usbg_prepare_w_request(struct usbg_cmd * cmd,struct usb_request * req)979 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
980 {
981 struct se_cmd *se_cmd = &cmd->se_cmd;
982 struct f_uas *fu = cmd->fu;
983 struct usb_gadget *gadget = fuas_to_gadget(fu);
984
985 if (!gadget->sg_supported) {
986 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
987 if (!cmd->data_buf)
988 return -ENOMEM;
989
990 req->buf = cmd->data_buf;
991 } else {
992 req->buf = NULL;
993 req->num_sgs = se_cmd->t_data_nents;
994 req->sg = se_cmd->t_data_sg;
995 }
996
997 req->is_last = 1;
998 req->complete = usbg_data_write_cmpl;
999 req->length = se_cmd->data_length;
1000 req->context = cmd;
1001 return 0;
1002 }
1003
usbg_send_status_response(struct se_cmd * se_cmd)1004 static int usbg_send_status_response(struct se_cmd *se_cmd)
1005 {
1006 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1007 se_cmd);
1008 struct f_uas *fu = cmd->fu;
1009
1010 if (fu->flags & USBG_IS_BOT)
1011 return bot_send_status_response(cmd);
1012 else
1013 return uasp_send_status_response(cmd);
1014 }
1015
usbg_send_write_request(struct se_cmd * se_cmd)1016 static int usbg_send_write_request(struct se_cmd *se_cmd)
1017 {
1018 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1019 se_cmd);
1020 struct f_uas *fu = cmd->fu;
1021
1022 if (fu->flags & USBG_IS_BOT)
1023 return bot_send_write_request(cmd);
1024 else
1025 return uasp_send_write_request(cmd);
1026 }
1027
usbg_send_read_response(struct se_cmd * se_cmd)1028 static int usbg_send_read_response(struct se_cmd *se_cmd)
1029 {
1030 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1031 se_cmd);
1032 struct f_uas *fu = cmd->fu;
1033
1034 if (fu->flags & USBG_IS_BOT)
1035 return bot_send_read_response(cmd);
1036 else
1037 return uasp_send_read_response(cmd);
1038 }
1039
usbg_cmd_work(struct work_struct * work)1040 static void usbg_cmd_work(struct work_struct *work)
1041 {
1042 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1043 struct se_cmd *se_cmd;
1044 struct tcm_usbg_nexus *tv_nexus;
1045 struct usbg_tpg *tpg;
1046 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1047
1048 se_cmd = &cmd->se_cmd;
1049 tpg = cmd->fu->tpg;
1050 tv_nexus = tpg->tpg_nexus;
1051 dir = get_cmd_dir(cmd->cmd_buf);
1052 if (dir < 0) {
1053 __target_init_cmd(se_cmd,
1054 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1055 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1056 cmd->prio_attr, cmd->sense_iu.sense,
1057 cmd->unpacked_lun, NULL);
1058 goto out;
1059 }
1060
1061 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1062 cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1063 cmd->prio_attr, dir, flags);
1064 return;
1065
1066 out:
1067 transport_send_check_condition_and_sense(se_cmd,
1068 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1069 transport_generic_free_cmd(&cmd->se_cmd, 0);
1070 }
1071
usbg_get_cmd(struct f_uas * fu,struct tcm_usbg_nexus * tv_nexus,u32 scsi_tag)1072 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1073 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1074 {
1075 struct se_session *se_sess = tv_nexus->tvn_se_sess;
1076 struct usbg_cmd *cmd;
1077 int tag, cpu;
1078
1079 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1080 if (tag < 0)
1081 return ERR_PTR(-ENOMEM);
1082
1083 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1084 memset(cmd, 0, sizeof(*cmd));
1085 cmd->se_cmd.map_tag = tag;
1086 cmd->se_cmd.map_cpu = cpu;
1087 cmd->se_cmd.tag = cmd->tag = scsi_tag;
1088 cmd->fu = fu;
1089
1090 return cmd;
1091 }
1092
1093 static void usbg_release_cmd(struct se_cmd *);
1094
usbg_submit_command(struct f_uas * fu,void * cmdbuf,unsigned int len)1095 static int usbg_submit_command(struct f_uas *fu,
1096 void *cmdbuf, unsigned int len)
1097 {
1098 struct command_iu *cmd_iu = cmdbuf;
1099 struct usbg_cmd *cmd;
1100 struct usbg_tpg *tpg = fu->tpg;
1101 struct tcm_usbg_nexus *tv_nexus;
1102 u32 cmd_len;
1103 u16 scsi_tag;
1104
1105 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1106 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1107 return -EINVAL;
1108 }
1109
1110 tv_nexus = tpg->tpg_nexus;
1111 if (!tv_nexus) {
1112 pr_err("Missing nexus, ignoring command\n");
1113 return -EINVAL;
1114 }
1115
1116 cmd_len = (cmd_iu->len & ~0x3) + 16;
1117 if (cmd_len > USBG_MAX_CMD)
1118 return -EINVAL;
1119
1120 scsi_tag = be16_to_cpup(&cmd_iu->tag);
1121 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1122 if (IS_ERR(cmd)) {
1123 pr_err("usbg_get_cmd failed\n");
1124 return -ENOMEM;
1125 }
1126 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1127
1128 if (fu->flags & USBG_USE_STREAMS) {
1129 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1130 goto err;
1131 if (!cmd->tag)
1132 cmd->stream = &fu->stream[0];
1133 else
1134 cmd->stream = &fu->stream[cmd->tag - 1];
1135 } else {
1136 cmd->stream = &fu->stream[0];
1137 }
1138
1139 switch (cmd_iu->prio_attr & 0x7) {
1140 case UAS_HEAD_TAG:
1141 cmd->prio_attr = TCM_HEAD_TAG;
1142 break;
1143 case UAS_ORDERED_TAG:
1144 cmd->prio_attr = TCM_ORDERED_TAG;
1145 break;
1146 case UAS_ACA:
1147 cmd->prio_attr = TCM_ACA_TAG;
1148 break;
1149 default:
1150 pr_debug_once("Unsupported prio_attr: %02x.\n",
1151 cmd_iu->prio_attr);
1152 fallthrough;
1153 case UAS_SIMPLE_TAG:
1154 cmd->prio_attr = TCM_SIMPLE_TAG;
1155 break;
1156 }
1157
1158 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1159
1160 INIT_WORK(&cmd->work, usbg_cmd_work);
1161 queue_work(tpg->workqueue, &cmd->work);
1162
1163 return 0;
1164 err:
1165 usbg_release_cmd(&cmd->se_cmd);
1166 return -EINVAL;
1167 }
1168
bot_cmd_work(struct work_struct * work)1169 static void bot_cmd_work(struct work_struct *work)
1170 {
1171 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1172 struct se_cmd *se_cmd;
1173 struct tcm_usbg_nexus *tv_nexus;
1174 struct usbg_tpg *tpg;
1175 int dir;
1176
1177 se_cmd = &cmd->se_cmd;
1178 tpg = cmd->fu->tpg;
1179 tv_nexus = tpg->tpg_nexus;
1180 dir = get_cmd_dir(cmd->cmd_buf);
1181 if (dir < 0) {
1182 __target_init_cmd(se_cmd,
1183 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1184 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1185 cmd->prio_attr, cmd->sense_iu.sense,
1186 cmd->unpacked_lun, NULL);
1187 goto out;
1188 }
1189
1190 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1191 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1192 cmd->data_len, cmd->prio_attr, dir, 0);
1193 return;
1194
1195 out:
1196 transport_send_check_condition_and_sense(se_cmd,
1197 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1198 transport_generic_free_cmd(&cmd->se_cmd, 0);
1199 }
1200
bot_submit_command(struct f_uas * fu,void * cmdbuf,unsigned int len)1201 static int bot_submit_command(struct f_uas *fu,
1202 void *cmdbuf, unsigned int len)
1203 {
1204 struct bulk_cb_wrap *cbw = cmdbuf;
1205 struct usbg_cmd *cmd;
1206 struct usbg_tpg *tpg = fu->tpg;
1207 struct tcm_usbg_nexus *tv_nexus;
1208 u32 cmd_len;
1209
1210 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1211 pr_err("Wrong signature on CBW\n");
1212 return -EINVAL;
1213 }
1214 if (len != 31) {
1215 pr_err("Wrong length for CBW\n");
1216 return -EINVAL;
1217 }
1218
1219 cmd_len = cbw->Length;
1220 if (cmd_len < 1 || cmd_len > 16)
1221 return -EINVAL;
1222
1223 tv_nexus = tpg->tpg_nexus;
1224 if (!tv_nexus) {
1225 pr_err("Missing nexus, ignoring command\n");
1226 return -ENODEV;
1227 }
1228
1229 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1230 if (IS_ERR(cmd)) {
1231 pr_err("usbg_get_cmd failed\n");
1232 return -ENOMEM;
1233 }
1234 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1235
1236 cmd->bot_tag = cbw->Tag;
1237 cmd->prio_attr = TCM_SIMPLE_TAG;
1238 cmd->unpacked_lun = cbw->Lun;
1239 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1240 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1241 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1242
1243 INIT_WORK(&cmd->work, bot_cmd_work);
1244 queue_work(tpg->workqueue, &cmd->work);
1245
1246 return 0;
1247 }
1248
1249 /* Start fabric.c code */
1250
usbg_check_true(struct se_portal_group * se_tpg)1251 static int usbg_check_true(struct se_portal_group *se_tpg)
1252 {
1253 return 1;
1254 }
1255
usbg_get_fabric_wwn(struct se_portal_group * se_tpg)1256 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1257 {
1258 struct usbg_tpg *tpg = container_of(se_tpg,
1259 struct usbg_tpg, se_tpg);
1260 struct usbg_tport *tport = tpg->tport;
1261
1262 return &tport->tport_name[0];
1263 }
1264
usbg_get_tag(struct se_portal_group * se_tpg)1265 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1266 {
1267 struct usbg_tpg *tpg = container_of(se_tpg,
1268 struct usbg_tpg, se_tpg);
1269 return tpg->tport_tpgt;
1270 }
1271
usbg_release_cmd(struct se_cmd * se_cmd)1272 static void usbg_release_cmd(struct se_cmd *se_cmd)
1273 {
1274 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1275 se_cmd);
1276 struct se_session *se_sess = se_cmd->se_sess;
1277
1278 kfree(cmd->data_buf);
1279 target_free_tag(se_sess, se_cmd);
1280 }
1281
usbg_queue_tm_rsp(struct se_cmd * se_cmd)1282 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1283 {
1284 }
1285
usbg_aborted_task(struct se_cmd * se_cmd)1286 static void usbg_aborted_task(struct se_cmd *se_cmd)
1287 {
1288 }
1289
usbg_check_wwn(const char * name)1290 static const char *usbg_check_wwn(const char *name)
1291 {
1292 const char *n;
1293 unsigned int len;
1294
1295 n = strstr(name, "naa.");
1296 if (!n)
1297 return NULL;
1298 n += 4;
1299 len = strlen(n);
1300 if (len == 0 || len > USBG_NAMELEN - 1)
1301 return NULL;
1302 return n;
1303 }
1304
usbg_init_nodeacl(struct se_node_acl * se_nacl,const char * name)1305 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1306 {
1307 if (!usbg_check_wwn(name))
1308 return -EINVAL;
1309 return 0;
1310 }
1311
usbg_make_tpg(struct se_wwn * wwn,const char * name)1312 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1313 const char *name)
1314 {
1315 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1316 tport_wwn);
1317 struct usbg_tpg *tpg;
1318 unsigned long tpgt;
1319 int ret;
1320 struct f_tcm_opts *opts;
1321 unsigned i;
1322
1323 if (strstr(name, "tpgt_") != name)
1324 return ERR_PTR(-EINVAL);
1325 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1326 return ERR_PTR(-EINVAL);
1327 ret = -ENODEV;
1328 mutex_lock(&tpg_instances_lock);
1329 for (i = 0; i < TPG_INSTANCES; ++i)
1330 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1331 break;
1332 if (i == TPG_INSTANCES)
1333 goto unlock_inst;
1334
1335 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1336 func_inst);
1337 mutex_lock(&opts->dep_lock);
1338 if (!opts->ready)
1339 goto unlock_dep;
1340
1341 if (opts->has_dep) {
1342 if (!try_module_get(opts->dependent))
1343 goto unlock_dep;
1344 } else {
1345 ret = configfs_depend_item_unlocked(
1346 wwn->wwn_group.cg_subsys,
1347 &opts->func_inst.group.cg_item);
1348 if (ret)
1349 goto unlock_dep;
1350 }
1351
1352 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1353 ret = -ENOMEM;
1354 if (!tpg)
1355 goto unref_dep;
1356 mutex_init(&tpg->tpg_mutex);
1357 atomic_set(&tpg->tpg_port_count, 0);
1358 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1359 if (!tpg->workqueue)
1360 goto free_tpg;
1361
1362 tpg->tport = tport;
1363 tpg->tport_tpgt = tpgt;
1364
1365 /*
1366 * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1367 * pretend to be SAS..
1368 */
1369 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1370 if (ret < 0)
1371 goto free_workqueue;
1372
1373 tpg_instances[i].tpg = tpg;
1374 tpg->fi = tpg_instances[i].func_inst;
1375 mutex_unlock(&opts->dep_lock);
1376 mutex_unlock(&tpg_instances_lock);
1377 return &tpg->se_tpg;
1378
1379 free_workqueue:
1380 destroy_workqueue(tpg->workqueue);
1381 free_tpg:
1382 kfree(tpg);
1383 unref_dep:
1384 if (opts->has_dep)
1385 module_put(opts->dependent);
1386 else
1387 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1388 unlock_dep:
1389 mutex_unlock(&opts->dep_lock);
1390 unlock_inst:
1391 mutex_unlock(&tpg_instances_lock);
1392
1393 return ERR_PTR(ret);
1394 }
1395
1396 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1397
usbg_drop_tpg(struct se_portal_group * se_tpg)1398 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1399 {
1400 struct usbg_tpg *tpg = container_of(se_tpg,
1401 struct usbg_tpg, se_tpg);
1402 unsigned i;
1403 struct f_tcm_opts *opts;
1404
1405 tcm_usbg_drop_nexus(tpg);
1406 core_tpg_deregister(se_tpg);
1407 destroy_workqueue(tpg->workqueue);
1408
1409 mutex_lock(&tpg_instances_lock);
1410 for (i = 0; i < TPG_INSTANCES; ++i)
1411 if (tpg_instances[i].tpg == tpg)
1412 break;
1413 if (i < TPG_INSTANCES) {
1414 tpg_instances[i].tpg = NULL;
1415 opts = container_of(tpg_instances[i].func_inst,
1416 struct f_tcm_opts, func_inst);
1417 mutex_lock(&opts->dep_lock);
1418 if (opts->has_dep)
1419 module_put(opts->dependent);
1420 else
1421 configfs_undepend_item_unlocked(
1422 &opts->func_inst.group.cg_item);
1423 mutex_unlock(&opts->dep_lock);
1424 }
1425 mutex_unlock(&tpg_instances_lock);
1426
1427 kfree(tpg);
1428 }
1429
usbg_make_tport(struct target_fabric_configfs * tf,struct config_group * group,const char * name)1430 static struct se_wwn *usbg_make_tport(
1431 struct target_fabric_configfs *tf,
1432 struct config_group *group,
1433 const char *name)
1434 {
1435 struct usbg_tport *tport;
1436 const char *wnn_name;
1437 u64 wwpn = 0;
1438
1439 wnn_name = usbg_check_wwn(name);
1440 if (!wnn_name)
1441 return ERR_PTR(-EINVAL);
1442
1443 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1444 if (!(tport))
1445 return ERR_PTR(-ENOMEM);
1446
1447 tport->tport_wwpn = wwpn;
1448 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1449 return &tport->tport_wwn;
1450 }
1451
usbg_drop_tport(struct se_wwn * wwn)1452 static void usbg_drop_tport(struct se_wwn *wwn)
1453 {
1454 struct usbg_tport *tport = container_of(wwn,
1455 struct usbg_tport, tport_wwn);
1456 kfree(tport);
1457 }
1458
1459 /*
1460 * If somebody feels like dropping the version property, go ahead.
1461 */
usbg_wwn_version_show(struct config_item * item,char * page)1462 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1463 {
1464 return sprintf(page, "usb-gadget fabric module\n");
1465 }
1466
1467 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1468
1469 static struct configfs_attribute *usbg_wwn_attrs[] = {
1470 &usbg_wwn_attr_version,
1471 NULL,
1472 };
1473
1474 static int usbg_attach(struct usbg_tpg *);
1475 static void usbg_detach(struct usbg_tpg *);
1476
usbg_enable_tpg(struct se_portal_group * se_tpg,bool enable)1477 static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable)
1478 {
1479 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1480 int ret = 0;
1481
1482 if (enable)
1483 ret = usbg_attach(tpg);
1484 else
1485 usbg_detach(tpg);
1486 if (ret)
1487 return ret;
1488
1489 tpg->gadget_connect = enable;
1490
1491 return 0;
1492 }
1493
tcm_usbg_tpg_nexus_show(struct config_item * item,char * page)1494 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1495 {
1496 struct se_portal_group *se_tpg = to_tpg(item);
1497 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1498 struct tcm_usbg_nexus *tv_nexus;
1499 ssize_t ret;
1500
1501 mutex_lock(&tpg->tpg_mutex);
1502 tv_nexus = tpg->tpg_nexus;
1503 if (!tv_nexus) {
1504 ret = -ENODEV;
1505 goto out;
1506 }
1507 ret = sysfs_emit(page, "%s\n",
1508 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1509 out:
1510 mutex_unlock(&tpg->tpg_mutex);
1511 return ret;
1512 }
1513
usbg_alloc_sess_cb(struct se_portal_group * se_tpg,struct se_session * se_sess,void * p)1514 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1515 struct se_session *se_sess, void *p)
1516 {
1517 struct usbg_tpg *tpg = container_of(se_tpg,
1518 struct usbg_tpg, se_tpg);
1519
1520 tpg->tpg_nexus = p;
1521 return 0;
1522 }
1523
tcm_usbg_make_nexus(struct usbg_tpg * tpg,char * name)1524 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1525 {
1526 struct tcm_usbg_nexus *tv_nexus;
1527 int ret = 0;
1528
1529 mutex_lock(&tpg->tpg_mutex);
1530 if (tpg->tpg_nexus) {
1531 ret = -EEXIST;
1532 pr_debug("tpg->tpg_nexus already exists\n");
1533 goto out_unlock;
1534 }
1535
1536 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1537 if (!tv_nexus) {
1538 ret = -ENOMEM;
1539 goto out_unlock;
1540 }
1541
1542 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1543 USB_G_DEFAULT_SESSION_TAGS,
1544 sizeof(struct usbg_cmd),
1545 TARGET_PROT_NORMAL, name,
1546 tv_nexus, usbg_alloc_sess_cb);
1547 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1548 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1549 pr_debug(MAKE_NEXUS_MSG, name);
1550 #undef MAKE_NEXUS_MSG
1551 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1552 kfree(tv_nexus);
1553 }
1554
1555 out_unlock:
1556 mutex_unlock(&tpg->tpg_mutex);
1557 return ret;
1558 }
1559
tcm_usbg_drop_nexus(struct usbg_tpg * tpg)1560 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1561 {
1562 struct se_session *se_sess;
1563 struct tcm_usbg_nexus *tv_nexus;
1564 int ret = -ENODEV;
1565
1566 mutex_lock(&tpg->tpg_mutex);
1567 tv_nexus = tpg->tpg_nexus;
1568 if (!tv_nexus)
1569 goto out;
1570
1571 se_sess = tv_nexus->tvn_se_sess;
1572 if (!se_sess)
1573 goto out;
1574
1575 if (atomic_read(&tpg->tpg_port_count)) {
1576 ret = -EPERM;
1577 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1578 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1579 #undef MSG
1580 goto out;
1581 }
1582
1583 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1584 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1585 /*
1586 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1587 */
1588 target_remove_session(se_sess);
1589 tpg->tpg_nexus = NULL;
1590
1591 kfree(tv_nexus);
1592 ret = 0;
1593 out:
1594 mutex_unlock(&tpg->tpg_mutex);
1595 return ret;
1596 }
1597
tcm_usbg_tpg_nexus_store(struct config_item * item,const char * page,size_t count)1598 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1599 const char *page, size_t count)
1600 {
1601 struct se_portal_group *se_tpg = to_tpg(item);
1602 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1603 unsigned char i_port[USBG_NAMELEN], *ptr;
1604 int ret;
1605
1606 if (!strncmp(page, "NULL", 4)) {
1607 ret = tcm_usbg_drop_nexus(tpg);
1608 return (!ret) ? count : ret;
1609 }
1610 if (strlen(page) >= USBG_NAMELEN) {
1611
1612 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1613 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1614 #undef NEXUS_STORE_MSG
1615 return -EINVAL;
1616 }
1617 snprintf(i_port, USBG_NAMELEN, "%s", page);
1618
1619 ptr = strstr(i_port, "naa.");
1620 if (!ptr) {
1621 pr_err("Missing 'naa.' prefix\n");
1622 return -EINVAL;
1623 }
1624
1625 if (i_port[strlen(i_port) - 1] == '\n')
1626 i_port[strlen(i_port) - 1] = '\0';
1627
1628 ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1629 if (ret < 0)
1630 return ret;
1631 return count;
1632 }
1633
1634 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1635
1636 static struct configfs_attribute *usbg_base_attrs[] = {
1637 &tcm_usbg_tpg_attr_nexus,
1638 NULL,
1639 };
1640
usbg_port_link(struct se_portal_group * se_tpg,struct se_lun * lun)1641 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1642 {
1643 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1644
1645 atomic_inc(&tpg->tpg_port_count);
1646 smp_mb__after_atomic();
1647 return 0;
1648 }
1649
usbg_port_unlink(struct se_portal_group * se_tpg,struct se_lun * se_lun)1650 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1651 struct se_lun *se_lun)
1652 {
1653 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1654
1655 atomic_dec(&tpg->tpg_port_count);
1656 smp_mb__after_atomic();
1657 }
1658
usbg_check_stop_free(struct se_cmd * se_cmd)1659 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1660 {
1661 return target_put_sess_cmd(se_cmd);
1662 }
1663
1664 static const struct target_core_fabric_ops usbg_ops = {
1665 .module = THIS_MODULE,
1666 .fabric_name = "usb_gadget",
1667 .tpg_get_wwn = usbg_get_fabric_wwn,
1668 .tpg_get_tag = usbg_get_tag,
1669 .tpg_check_demo_mode = usbg_check_true,
1670 .release_cmd = usbg_release_cmd,
1671 .sess_get_initiator_sid = NULL,
1672 .write_pending = usbg_send_write_request,
1673 .queue_data_in = usbg_send_read_response,
1674 .queue_status = usbg_send_status_response,
1675 .queue_tm_rsp = usbg_queue_tm_rsp,
1676 .aborted_task = usbg_aborted_task,
1677 .check_stop_free = usbg_check_stop_free,
1678
1679 .fabric_make_wwn = usbg_make_tport,
1680 .fabric_drop_wwn = usbg_drop_tport,
1681 .fabric_make_tpg = usbg_make_tpg,
1682 .fabric_enable_tpg = usbg_enable_tpg,
1683 .fabric_drop_tpg = usbg_drop_tpg,
1684 .fabric_post_link = usbg_port_link,
1685 .fabric_pre_unlink = usbg_port_unlink,
1686 .fabric_init_nodeacl = usbg_init_nodeacl,
1687
1688 .tfc_wwn_attrs = usbg_wwn_attrs,
1689 .tfc_tpg_base_attrs = usbg_base_attrs,
1690
1691 .default_submit_type = TARGET_DIRECT_SUBMIT,
1692 .direct_submit_supp = 1,
1693 };
1694
1695 /* Start gadget.c code */
1696
1697 static struct usb_interface_descriptor bot_intf_desc = {
1698 .bLength = sizeof(bot_intf_desc),
1699 .bDescriptorType = USB_DT_INTERFACE,
1700 .bNumEndpoints = 2,
1701 .bAlternateSetting = USB_G_ALT_INT_BBB,
1702 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1703 .bInterfaceSubClass = USB_SC_SCSI,
1704 .bInterfaceProtocol = USB_PR_BULK,
1705 };
1706
1707 static struct usb_interface_descriptor uasp_intf_desc = {
1708 .bLength = sizeof(uasp_intf_desc),
1709 .bDescriptorType = USB_DT_INTERFACE,
1710 .bNumEndpoints = 4,
1711 .bAlternateSetting = USB_G_ALT_INT_UAS,
1712 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1713 .bInterfaceSubClass = USB_SC_SCSI,
1714 .bInterfaceProtocol = USB_PR_UAS,
1715 };
1716
1717 static struct usb_endpoint_descriptor uasp_bi_desc = {
1718 .bLength = USB_DT_ENDPOINT_SIZE,
1719 .bDescriptorType = USB_DT_ENDPOINT,
1720 .bEndpointAddress = USB_DIR_IN,
1721 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1722 .wMaxPacketSize = cpu_to_le16(512),
1723 };
1724
1725 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1726 .bLength = USB_DT_ENDPOINT_SIZE,
1727 .bDescriptorType = USB_DT_ENDPOINT,
1728 .bEndpointAddress = USB_DIR_IN,
1729 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1730 };
1731
1732 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1733 .bLength = sizeof(uasp_bi_pipe_desc),
1734 .bDescriptorType = USB_DT_PIPE_USAGE,
1735 .bPipeID = DATA_IN_PIPE_ID,
1736 };
1737
1738 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1739 .bLength = USB_DT_ENDPOINT_SIZE,
1740 .bDescriptorType = USB_DT_ENDPOINT,
1741 .bEndpointAddress = USB_DIR_IN,
1742 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1743 .wMaxPacketSize = cpu_to_le16(1024),
1744 };
1745
1746 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1747 .bLength = sizeof(uasp_bi_ep_comp_desc),
1748 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1749 .bMaxBurst = 0,
1750 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1751 .wBytesPerInterval = 0,
1752 };
1753
1754 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1755 .bLength = sizeof(bot_bi_ep_comp_desc),
1756 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1757 .bMaxBurst = 0,
1758 };
1759
1760 static struct usb_endpoint_descriptor uasp_bo_desc = {
1761 .bLength = USB_DT_ENDPOINT_SIZE,
1762 .bDescriptorType = USB_DT_ENDPOINT,
1763 .bEndpointAddress = USB_DIR_OUT,
1764 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1765 .wMaxPacketSize = cpu_to_le16(512),
1766 };
1767
1768 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1769 .bLength = USB_DT_ENDPOINT_SIZE,
1770 .bDescriptorType = USB_DT_ENDPOINT,
1771 .bEndpointAddress = USB_DIR_OUT,
1772 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1773 };
1774
1775 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1776 .bLength = sizeof(uasp_bo_pipe_desc),
1777 .bDescriptorType = USB_DT_PIPE_USAGE,
1778 .bPipeID = DATA_OUT_PIPE_ID,
1779 };
1780
1781 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1782 .bLength = USB_DT_ENDPOINT_SIZE,
1783 .bDescriptorType = USB_DT_ENDPOINT,
1784 .bEndpointAddress = USB_DIR_OUT,
1785 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1786 .wMaxPacketSize = cpu_to_le16(0x400),
1787 };
1788
1789 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1790 .bLength = sizeof(uasp_bo_ep_comp_desc),
1791 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1792 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1793 };
1794
1795 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1796 .bLength = sizeof(bot_bo_ep_comp_desc),
1797 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1798 };
1799
1800 static struct usb_endpoint_descriptor uasp_status_desc = {
1801 .bLength = USB_DT_ENDPOINT_SIZE,
1802 .bDescriptorType = USB_DT_ENDPOINT,
1803 .bEndpointAddress = USB_DIR_IN,
1804 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1805 .wMaxPacketSize = cpu_to_le16(512),
1806 };
1807
1808 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1809 .bLength = USB_DT_ENDPOINT_SIZE,
1810 .bDescriptorType = USB_DT_ENDPOINT,
1811 .bEndpointAddress = USB_DIR_IN,
1812 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1813 };
1814
1815 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1816 .bLength = sizeof(uasp_status_pipe_desc),
1817 .bDescriptorType = USB_DT_PIPE_USAGE,
1818 .bPipeID = STATUS_PIPE_ID,
1819 };
1820
1821 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1822 .bLength = USB_DT_ENDPOINT_SIZE,
1823 .bDescriptorType = USB_DT_ENDPOINT,
1824 .bEndpointAddress = USB_DIR_IN,
1825 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1826 .wMaxPacketSize = cpu_to_le16(1024),
1827 };
1828
1829 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1830 .bLength = sizeof(uasp_status_in_ep_comp_desc),
1831 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1832 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
1833 };
1834
1835 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1836 .bLength = USB_DT_ENDPOINT_SIZE,
1837 .bDescriptorType = USB_DT_ENDPOINT,
1838 .bEndpointAddress = USB_DIR_OUT,
1839 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1840 .wMaxPacketSize = cpu_to_le16(512),
1841 };
1842
1843 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1844 .bLength = USB_DT_ENDPOINT_SIZE,
1845 .bDescriptorType = USB_DT_ENDPOINT,
1846 .bEndpointAddress = USB_DIR_OUT,
1847 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1848 };
1849
1850 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1851 .bLength = sizeof(uasp_cmd_pipe_desc),
1852 .bDescriptorType = USB_DT_PIPE_USAGE,
1853 .bPipeID = CMD_PIPE_ID,
1854 };
1855
1856 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1857 .bLength = USB_DT_ENDPOINT_SIZE,
1858 .bDescriptorType = USB_DT_ENDPOINT,
1859 .bEndpointAddress = USB_DIR_OUT,
1860 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1861 .wMaxPacketSize = cpu_to_le16(1024),
1862 };
1863
1864 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1865 .bLength = sizeof(uasp_cmd_comp_desc),
1866 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
1867 };
1868
1869 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1870 (struct usb_descriptor_header *) &bot_intf_desc,
1871 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1872 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1873
1874 (struct usb_descriptor_header *) &uasp_intf_desc,
1875 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1876 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1877 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1878 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1879 (struct usb_descriptor_header *) &uasp_fs_status_desc,
1880 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1881 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1882 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1883 NULL,
1884 };
1885
1886 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1887 (struct usb_descriptor_header *) &bot_intf_desc,
1888 (struct usb_descriptor_header *) &uasp_bi_desc,
1889 (struct usb_descriptor_header *) &uasp_bo_desc,
1890
1891 (struct usb_descriptor_header *) &uasp_intf_desc,
1892 (struct usb_descriptor_header *) &uasp_bi_desc,
1893 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1894 (struct usb_descriptor_header *) &uasp_bo_desc,
1895 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1896 (struct usb_descriptor_header *) &uasp_status_desc,
1897 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1898 (struct usb_descriptor_header *) &uasp_cmd_desc,
1899 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1900 NULL,
1901 };
1902
1903 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1904 (struct usb_descriptor_header *) &bot_intf_desc,
1905 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1906 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1907 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1908 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1909
1910 (struct usb_descriptor_header *) &uasp_intf_desc,
1911 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1912 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1913 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1914 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1915 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1916 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1917 (struct usb_descriptor_header *) &uasp_ss_status_desc,
1918 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1919 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1920 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1921 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1922 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1923 NULL,
1924 };
1925
1926 static struct usb_string tcm_us_strings[] = {
1927 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
1928 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
1929 { },
1930 };
1931
1932 static struct usb_gadget_strings tcm_stringtab = {
1933 .language = 0x0409,
1934 .strings = tcm_us_strings,
1935 };
1936
1937 static struct usb_gadget_strings *tcm_strings[] = {
1938 &tcm_stringtab,
1939 NULL,
1940 };
1941
tcm_bind(struct usb_configuration * c,struct usb_function * f)1942 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1943 {
1944 struct f_uas *fu = to_f_uas(f);
1945 struct usb_string *us;
1946 struct usb_gadget *gadget = c->cdev->gadget;
1947 struct usb_ep *ep;
1948 struct f_tcm_opts *opts;
1949 int iface;
1950 int ret;
1951
1952 opts = container_of(f->fi, struct f_tcm_opts, func_inst);
1953
1954 mutex_lock(&opts->dep_lock);
1955 if (!opts->can_attach) {
1956 mutex_unlock(&opts->dep_lock);
1957 return -ENODEV;
1958 }
1959 mutex_unlock(&opts->dep_lock);
1960 us = usb_gstrings_attach(c->cdev, tcm_strings,
1961 ARRAY_SIZE(tcm_us_strings));
1962 if (IS_ERR(us))
1963 return PTR_ERR(us);
1964 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
1965 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
1966
1967 iface = usb_interface_id(c, f);
1968 if (iface < 0)
1969 return iface;
1970
1971 bot_intf_desc.bInterfaceNumber = iface;
1972 uasp_intf_desc.bInterfaceNumber = iface;
1973 fu->iface = iface;
1974 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
1975 &uasp_bi_ep_comp_desc);
1976 if (!ep)
1977 goto ep_fail;
1978
1979 fu->ep_in = ep;
1980
1981 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
1982 &uasp_bo_ep_comp_desc);
1983 if (!ep)
1984 goto ep_fail;
1985 fu->ep_out = ep;
1986
1987 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
1988 &uasp_status_in_ep_comp_desc);
1989 if (!ep)
1990 goto ep_fail;
1991 fu->ep_status = ep;
1992
1993 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
1994 &uasp_cmd_comp_desc);
1995 if (!ep)
1996 goto ep_fail;
1997 fu->ep_cmd = ep;
1998
1999 /* Assume endpoint addresses are the same for both speeds */
2000 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2001 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2002 uasp_status_desc.bEndpointAddress =
2003 uasp_ss_status_desc.bEndpointAddress;
2004 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2005
2006 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2007 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2008 uasp_fs_status_desc.bEndpointAddress =
2009 uasp_ss_status_desc.bEndpointAddress;
2010 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2011
2012 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2013 uasp_hs_function_desc, uasp_ss_function_desc,
2014 uasp_ss_function_desc);
2015 if (ret)
2016 goto ep_fail;
2017
2018 return 0;
2019 ep_fail:
2020 pr_err("Can't claim all required eps\n");
2021
2022 return -ENOTSUPP;
2023 }
2024
2025 struct guas_setup_wq {
2026 struct work_struct work;
2027 struct f_uas *fu;
2028 unsigned int alt;
2029 };
2030
tcm_delayed_set_alt(struct work_struct * wq)2031 static void tcm_delayed_set_alt(struct work_struct *wq)
2032 {
2033 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2034 work);
2035 struct f_uas *fu = work->fu;
2036 int alt = work->alt;
2037
2038 kfree(work);
2039
2040 if (fu->flags & USBG_IS_BOT)
2041 bot_cleanup_old_alt(fu);
2042 if (fu->flags & USBG_IS_UAS)
2043 uasp_cleanup_old_alt(fu);
2044
2045 if (alt == USB_G_ALT_INT_BBB)
2046 bot_set_alt(fu);
2047 else if (alt == USB_G_ALT_INT_UAS)
2048 uasp_set_alt(fu);
2049 usb_composite_setup_continue(fu->function.config->cdev);
2050 }
2051
tcm_get_alt(struct usb_function * f,unsigned intf)2052 static int tcm_get_alt(struct usb_function *f, unsigned intf)
2053 {
2054 if (intf == bot_intf_desc.bInterfaceNumber)
2055 return USB_G_ALT_INT_BBB;
2056 if (intf == uasp_intf_desc.bInterfaceNumber)
2057 return USB_G_ALT_INT_UAS;
2058
2059 return -EOPNOTSUPP;
2060 }
2061
tcm_set_alt(struct usb_function * f,unsigned intf,unsigned alt)2062 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2063 {
2064 struct f_uas *fu = to_f_uas(f);
2065
2066 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2067 struct guas_setup_wq *work;
2068
2069 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2070 if (!work)
2071 return -ENOMEM;
2072 INIT_WORK(&work->work, tcm_delayed_set_alt);
2073 work->fu = fu;
2074 work->alt = alt;
2075 schedule_work(&work->work);
2076 return USB_GADGET_DELAYED_STATUS;
2077 }
2078 return -EOPNOTSUPP;
2079 }
2080
tcm_disable(struct usb_function * f)2081 static void tcm_disable(struct usb_function *f)
2082 {
2083 struct f_uas *fu = to_f_uas(f);
2084
2085 if (fu->flags & USBG_IS_UAS)
2086 uasp_cleanup_old_alt(fu);
2087 else if (fu->flags & USBG_IS_BOT)
2088 bot_cleanup_old_alt(fu);
2089 fu->flags = 0;
2090 }
2091
tcm_setup(struct usb_function * f,const struct usb_ctrlrequest * ctrl)2092 static int tcm_setup(struct usb_function *f,
2093 const struct usb_ctrlrequest *ctrl)
2094 {
2095 struct f_uas *fu = to_f_uas(f);
2096
2097 if (!(fu->flags & USBG_IS_BOT))
2098 return -EOPNOTSUPP;
2099
2100 return usbg_bot_setup(f, ctrl);
2101 }
2102
to_f_tcm_opts(struct config_item * item)2103 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2104 {
2105 return container_of(to_config_group(item), struct f_tcm_opts,
2106 func_inst.group);
2107 }
2108
tcm_attr_release(struct config_item * item)2109 static void tcm_attr_release(struct config_item *item)
2110 {
2111 struct f_tcm_opts *opts = to_f_tcm_opts(item);
2112
2113 usb_put_function_instance(&opts->func_inst);
2114 }
2115
2116 static struct configfs_item_operations tcm_item_ops = {
2117 .release = tcm_attr_release,
2118 };
2119
2120 static const struct config_item_type tcm_func_type = {
2121 .ct_item_ops = &tcm_item_ops,
2122 .ct_owner = THIS_MODULE,
2123 };
2124
tcm_free_inst(struct usb_function_instance * f)2125 static void tcm_free_inst(struct usb_function_instance *f)
2126 {
2127 struct f_tcm_opts *opts;
2128 unsigned i;
2129
2130 opts = container_of(f, struct f_tcm_opts, func_inst);
2131
2132 mutex_lock(&tpg_instances_lock);
2133 for (i = 0; i < TPG_INSTANCES; ++i)
2134 if (tpg_instances[i].func_inst == f)
2135 break;
2136 if (i < TPG_INSTANCES)
2137 tpg_instances[i].func_inst = NULL;
2138 mutex_unlock(&tpg_instances_lock);
2139
2140 kfree(opts);
2141 }
2142
tcm_register_callback(struct usb_function_instance * f)2143 static int tcm_register_callback(struct usb_function_instance *f)
2144 {
2145 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2146
2147 mutex_lock(&opts->dep_lock);
2148 opts->can_attach = true;
2149 mutex_unlock(&opts->dep_lock);
2150
2151 return 0;
2152 }
2153
tcm_unregister_callback(struct usb_function_instance * f)2154 static void tcm_unregister_callback(struct usb_function_instance *f)
2155 {
2156 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2157
2158 mutex_lock(&opts->dep_lock);
2159 unregister_gadget_item(opts->
2160 func_inst.group.cg_item.ci_parent->ci_parent);
2161 opts->can_attach = false;
2162 mutex_unlock(&opts->dep_lock);
2163 }
2164
usbg_attach(struct usbg_tpg * tpg)2165 static int usbg_attach(struct usbg_tpg *tpg)
2166 {
2167 struct usb_function_instance *f = tpg->fi;
2168 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2169
2170 if (opts->tcm_register_callback)
2171 return opts->tcm_register_callback(f);
2172
2173 return 0;
2174 }
2175
usbg_detach(struct usbg_tpg * tpg)2176 static void usbg_detach(struct usbg_tpg *tpg)
2177 {
2178 struct usb_function_instance *f = tpg->fi;
2179 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2180
2181 if (opts->tcm_unregister_callback)
2182 opts->tcm_unregister_callback(f);
2183 }
2184
tcm_set_name(struct usb_function_instance * f,const char * name)2185 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2186 {
2187 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2188
2189 pr_debug("tcm: Activating %s\n", name);
2190
2191 mutex_lock(&opts->dep_lock);
2192 opts->ready = true;
2193 mutex_unlock(&opts->dep_lock);
2194
2195 return 0;
2196 }
2197
tcm_alloc_inst(void)2198 static struct usb_function_instance *tcm_alloc_inst(void)
2199 {
2200 struct f_tcm_opts *opts;
2201 int i;
2202
2203
2204 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2205 if (!opts)
2206 return ERR_PTR(-ENOMEM);
2207
2208 mutex_lock(&tpg_instances_lock);
2209 for (i = 0; i < TPG_INSTANCES; ++i)
2210 if (!tpg_instances[i].func_inst)
2211 break;
2212
2213 if (i == TPG_INSTANCES) {
2214 mutex_unlock(&tpg_instances_lock);
2215 kfree(opts);
2216 return ERR_PTR(-EBUSY);
2217 }
2218 tpg_instances[i].func_inst = &opts->func_inst;
2219 mutex_unlock(&tpg_instances_lock);
2220
2221 mutex_init(&opts->dep_lock);
2222 opts->func_inst.set_inst_name = tcm_set_name;
2223 opts->func_inst.free_func_inst = tcm_free_inst;
2224 opts->tcm_register_callback = tcm_register_callback;
2225 opts->tcm_unregister_callback = tcm_unregister_callback;
2226
2227 config_group_init_type_name(&opts->func_inst.group, "",
2228 &tcm_func_type);
2229
2230 return &opts->func_inst;
2231 }
2232
tcm_free(struct usb_function * f)2233 static void tcm_free(struct usb_function *f)
2234 {
2235 struct f_uas *tcm = to_f_uas(f);
2236
2237 kfree(tcm);
2238 }
2239
tcm_unbind(struct usb_configuration * c,struct usb_function * f)2240 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2241 {
2242 usb_free_all_descriptors(f);
2243 }
2244
tcm_alloc(struct usb_function_instance * fi)2245 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2246 {
2247 struct f_uas *fu;
2248 unsigned i;
2249
2250 mutex_lock(&tpg_instances_lock);
2251 for (i = 0; i < TPG_INSTANCES; ++i)
2252 if (tpg_instances[i].func_inst == fi)
2253 break;
2254 if (i == TPG_INSTANCES) {
2255 mutex_unlock(&tpg_instances_lock);
2256 return ERR_PTR(-ENODEV);
2257 }
2258
2259 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2260 if (!fu) {
2261 mutex_unlock(&tpg_instances_lock);
2262 return ERR_PTR(-ENOMEM);
2263 }
2264
2265 fu->function.name = "Target Function";
2266 fu->function.bind = tcm_bind;
2267 fu->function.unbind = tcm_unbind;
2268 fu->function.set_alt = tcm_set_alt;
2269 fu->function.get_alt = tcm_get_alt;
2270 fu->function.setup = tcm_setup;
2271 fu->function.disable = tcm_disable;
2272 fu->function.free_func = tcm_free;
2273 fu->tpg = tpg_instances[i].tpg;
2274 mutex_unlock(&tpg_instances_lock);
2275
2276 return &fu->function;
2277 }
2278
2279 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2280
tcm_init(void)2281 static int __init tcm_init(void)
2282 {
2283 int ret;
2284
2285 ret = usb_function_register(&tcmusb_func);
2286 if (ret)
2287 return ret;
2288
2289 ret = target_register_template(&usbg_ops);
2290 if (ret)
2291 usb_function_unregister(&tcmusb_func);
2292
2293 return ret;
2294 }
2295 module_init(tcm_init);
2296
tcm_exit(void)2297 static void __exit tcm_exit(void)
2298 {
2299 target_unregister_template(&usbg_ops);
2300 usb_function_unregister(&tcmusb_func);
2301 }
2302 module_exit(tcm_exit);
2303
2304 MODULE_DESCRIPTION("Target based USB-Gadget");
2305 MODULE_LICENSE("GPL");
2306 MODULE_AUTHOR("Sebastian Andrzej Siewior");
2307