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[~shefty/rdma-dev.git] / drivers / usb / gadget / tcm_usb_gadget.c
1 /* Target based USB-Gadget
2  *
3  * UAS protocol handling, target callbacks, configfs handling,
4  * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
5  *
6  * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
7  * License: GPLv2 as published by FSF.
8  */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/configfs.h>
14 #include <linux/ctype.h>
15 #include <linux/usb/ch9.h>
16 #include <linux/usb/composite.h>
17 #include <linux/usb/gadget.h>
18 #include <linux/usb/storage.h>
19 #include <scsi/scsi.h>
20 #include <scsi/scsi_tcq.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/target_core_fabric_configfs.h>
24 #include <target/target_core_configfs.h>
25 #include <target/configfs_macros.h>
26 #include <asm/unaligned.h>
27
28 #include "tcm_usb_gadget.h"
29
30 USB_GADGET_COMPOSITE_OPTIONS();
31
32 static struct target_fabric_configfs *usbg_fabric_configfs;
33
34 static inline struct f_uas *to_f_uas(struct usb_function *f)
35 {
36         return container_of(f, struct f_uas, function);
37 }
38
39 static void usbg_cmd_release(struct kref *);
40
41 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
42 {
43         kref_put(&cmd->ref, usbg_cmd_release);
44 }
45
46 /* Start bot.c code */
47
48 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
49 {
50         int ret;
51
52         if (fu->flags & USBG_BOT_CMD_PEND)
53                 return 0;
54
55         ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
56         if (!ret)
57                 fu->flags |= USBG_BOT_CMD_PEND;
58         return ret;
59 }
60
61 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
62 {
63         struct usbg_cmd *cmd = req->context;
64         struct f_uas *fu = cmd->fu;
65
66         usbg_cleanup_cmd(cmd);
67         if (req->status < 0) {
68                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
69                 return;
70         }
71
72         /* CSW completed, wait for next CBW */
73         bot_enqueue_cmd_cbw(fu);
74 }
75
76 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
77 {
78         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
79         int ret;
80         u8 *sense;
81         unsigned int csw_stat;
82
83         csw_stat = cmd->csw_code;
84
85         /*
86          * We can't send SENSE as a response. So we take ASC & ASCQ from our
87          * sense buffer and queue it and hope the host sends a REQUEST_SENSE
88          * command where it learns why we failed.
89          */
90         sense = cmd->sense_iu.sense;
91
92         csw->Tag = cmd->bot_tag;
93         csw->Status = csw_stat;
94         fu->bot_status.req->context = cmd;
95         ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
96         if (ret)
97                 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
98 }
99
100 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
101 {
102         struct usbg_cmd *cmd = req->context;
103         struct f_uas *fu = cmd->fu;
104
105         if (req->status < 0)
106                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
107
108         if (cmd->data_len) {
109                 if (cmd->data_len > ep->maxpacket) {
110                         req->length = ep->maxpacket;
111                         cmd->data_len -= ep->maxpacket;
112                 } else {
113                         req->length = cmd->data_len;
114                         cmd->data_len = 0;
115                 }
116
117                 usb_ep_queue(ep, req, GFP_ATOMIC);
118                 return ;
119         }
120         bot_enqueue_sense_code(fu, cmd);
121 }
122
123 static void bot_send_bad_status(struct usbg_cmd *cmd)
124 {
125         struct f_uas *fu = cmd->fu;
126         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
127         struct usb_request *req;
128         struct usb_ep *ep;
129
130         csw->Residue = cpu_to_le32(cmd->data_len);
131
132         if (cmd->data_len) {
133                 if (cmd->is_read) {
134                         ep = fu->ep_in;
135                         req = fu->bot_req_in;
136                 } else {
137                         ep = fu->ep_out;
138                         req = fu->bot_req_out;
139                 }
140
141                 if (cmd->data_len > fu->ep_in->maxpacket) {
142                         req->length = ep->maxpacket;
143                         cmd->data_len -= ep->maxpacket;
144                 } else {
145                         req->length = cmd->data_len;
146                         cmd->data_len = 0;
147                 }
148                 req->complete = bot_err_compl;
149                 req->context = cmd;
150                 req->buf = fu->cmd.buf;
151                 usb_ep_queue(ep, req, GFP_KERNEL);
152         } else {
153                 bot_enqueue_sense_code(fu, cmd);
154         }
155 }
156
157 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
158 {
159         struct f_uas *fu = cmd->fu;
160         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
161         int ret;
162
163         if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
164                 if (!moved_data && cmd->data_len) {
165                         /*
166                          * the host wants to move data, we don't. Fill / empty
167                          * the pipe and then send the csw with reside set.
168                          */
169                         cmd->csw_code = US_BULK_STAT_OK;
170                         bot_send_bad_status(cmd);
171                         return 0;
172                 }
173
174                 csw->Tag = cmd->bot_tag;
175                 csw->Residue = cpu_to_le32(0);
176                 csw->Status = US_BULK_STAT_OK;
177                 fu->bot_status.req->context = cmd;
178
179                 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
180                 if (ret)
181                         pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
182         } else {
183                 cmd->csw_code = US_BULK_STAT_FAIL;
184                 bot_send_bad_status(cmd);
185         }
186         return 0;
187 }
188
189 /*
190  * Called after command (no data transfer) or after the write (to device)
191  * operation is completed
192  */
193 static int bot_send_status_response(struct usbg_cmd *cmd)
194 {
195         bool moved_data = false;
196
197         if (!cmd->is_read)
198                 moved_data = true;
199         return bot_send_status(cmd, moved_data);
200 }
201
202 /* Read request completed, now we have to send the CSW */
203 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
204 {
205         struct usbg_cmd *cmd = req->context;
206
207         if (req->status < 0)
208                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
209
210         bot_send_status(cmd, true);
211 }
212
213 static int bot_send_read_response(struct usbg_cmd *cmd)
214 {
215         struct f_uas *fu = cmd->fu;
216         struct se_cmd *se_cmd = &cmd->se_cmd;
217         struct usb_gadget *gadget = fuas_to_gadget(fu);
218         int ret;
219
220         if (!cmd->data_len) {
221                 cmd->csw_code = US_BULK_STAT_PHASE;
222                 bot_send_bad_status(cmd);
223                 return 0;
224         }
225
226         if (!gadget->sg_supported) {
227                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
228                 if (!cmd->data_buf)
229                         return -ENOMEM;
230
231                 sg_copy_to_buffer(se_cmd->t_data_sg,
232                                 se_cmd->t_data_nents,
233                                 cmd->data_buf,
234                                 se_cmd->data_length);
235
236                 fu->bot_req_in->buf = cmd->data_buf;
237         } else {
238                 fu->bot_req_in->buf = NULL;
239                 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
240                 fu->bot_req_in->sg = se_cmd->t_data_sg;
241         }
242
243         fu->bot_req_in->complete = bot_read_compl;
244         fu->bot_req_in->length = se_cmd->data_length;
245         fu->bot_req_in->context = cmd;
246         ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
247         if (ret)
248                 pr_err("%s(%d)\n", __func__, __LINE__);
249         return 0;
250 }
251
252 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
253 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
254
255 static int bot_send_write_request(struct usbg_cmd *cmd)
256 {
257         struct f_uas *fu = cmd->fu;
258         struct se_cmd *se_cmd = &cmd->se_cmd;
259         struct usb_gadget *gadget = fuas_to_gadget(fu);
260         int ret;
261
262         init_completion(&cmd->write_complete);
263         cmd->fu = fu;
264
265         if (!cmd->data_len) {
266                 cmd->csw_code = US_BULK_STAT_PHASE;
267                 return -EINVAL;
268         }
269
270         if (!gadget->sg_supported) {
271                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
272                 if (!cmd->data_buf)
273                         return -ENOMEM;
274
275                 fu->bot_req_out->buf = cmd->data_buf;
276         } else {
277                 fu->bot_req_out->buf = NULL;
278                 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
279                 fu->bot_req_out->sg = se_cmd->t_data_sg;
280         }
281
282         fu->bot_req_out->complete = usbg_data_write_cmpl;
283         fu->bot_req_out->length = se_cmd->data_length;
284         fu->bot_req_out->context = cmd;
285
286         ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
287         if (ret)
288                 goto cleanup;
289         ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
290         if (ret)
291                 pr_err("%s(%d)\n", __func__, __LINE__);
292
293         wait_for_completion(&cmd->write_complete);
294         target_execute_cmd(se_cmd);
295 cleanup:
296         return ret;
297 }
298
299 static int bot_submit_command(struct f_uas *, void *, unsigned int);
300
301 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
302 {
303         struct f_uas *fu = req->context;
304         int ret;
305
306         fu->flags &= ~USBG_BOT_CMD_PEND;
307
308         if (req->status < 0)
309                 return;
310
311         ret = bot_submit_command(fu, req->buf, req->actual);
312         if (ret)
313                 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
314 }
315
316 static int bot_prepare_reqs(struct f_uas *fu)
317 {
318         int ret;
319
320         fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
321         if (!fu->bot_req_in)
322                 goto err;
323
324         fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
325         if (!fu->bot_req_out)
326                 goto err_out;
327
328         fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
329         if (!fu->cmd.req)
330                 goto err_cmd;
331
332         fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
333         if (!fu->bot_status.req)
334                 goto err_sts;
335
336         fu->bot_status.req->buf = &fu->bot_status.csw;
337         fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
338         fu->bot_status.req->complete = bot_status_complete;
339         fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
340
341         fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
342         if (!fu->cmd.buf)
343                 goto err_buf;
344
345         fu->cmd.req->complete = bot_cmd_complete;
346         fu->cmd.req->buf = fu->cmd.buf;
347         fu->cmd.req->length = fu->ep_out->maxpacket;
348         fu->cmd.req->context = fu;
349
350         ret = bot_enqueue_cmd_cbw(fu);
351         if (ret)
352                 goto err_queue;
353         return 0;
354 err_queue:
355         kfree(fu->cmd.buf);
356         fu->cmd.buf = NULL;
357 err_buf:
358         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
359 err_sts:
360         usb_ep_free_request(fu->ep_out, fu->cmd.req);
361         fu->cmd.req = NULL;
362 err_cmd:
363         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
364         fu->bot_req_out = NULL;
365 err_out:
366         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
367         fu->bot_req_in = NULL;
368 err:
369         pr_err("BOT: endpoint setup failed\n");
370         return -ENOMEM;
371 }
372
373 void bot_cleanup_old_alt(struct f_uas *fu)
374 {
375         if (!(fu->flags & USBG_ENABLED))
376                 return;
377
378         usb_ep_disable(fu->ep_in);
379         usb_ep_disable(fu->ep_out);
380
381         if (!fu->bot_req_in)
382                 return;
383
384         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
385         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
386         usb_ep_free_request(fu->ep_out, fu->cmd.req);
387         usb_ep_free_request(fu->ep_out, fu->bot_status.req);
388
389         kfree(fu->cmd.buf);
390
391         fu->bot_req_in = NULL;
392         fu->bot_req_out = NULL;
393         fu->cmd.req = NULL;
394         fu->bot_status.req = NULL;
395         fu->cmd.buf = NULL;
396 }
397
398 static void bot_set_alt(struct f_uas *fu)
399 {
400         struct usb_function *f = &fu->function;
401         struct usb_gadget *gadget = f->config->cdev->gadget;
402         int ret;
403
404         fu->flags = USBG_IS_BOT;
405
406         config_ep_by_speed(gadget, f, fu->ep_in);
407         ret = usb_ep_enable(fu->ep_in);
408         if (ret)
409                 goto err_b_in;
410
411         config_ep_by_speed(gadget, f, fu->ep_out);
412         ret = usb_ep_enable(fu->ep_out);
413         if (ret)
414                 goto err_b_out;
415
416         ret = bot_prepare_reqs(fu);
417         if (ret)
418                 goto err_wq;
419         fu->flags |= USBG_ENABLED;
420         pr_info("Using the BOT protocol\n");
421         return;
422 err_wq:
423         usb_ep_disable(fu->ep_out);
424 err_b_out:
425         usb_ep_disable(fu->ep_in);
426 err_b_in:
427         fu->flags = USBG_IS_BOT;
428 }
429
430 static int usbg_bot_setup(struct usb_function *f,
431                 const struct usb_ctrlrequest *ctrl)
432 {
433         struct f_uas *fu = to_f_uas(f);
434         struct usb_composite_dev *cdev = f->config->cdev;
435         u16 w_value = le16_to_cpu(ctrl->wValue);
436         u16 w_length = le16_to_cpu(ctrl->wLength);
437         int luns;
438         u8 *ret_lun;
439
440         switch (ctrl->bRequest) {
441         case US_BULK_GET_MAX_LUN:
442                 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
443                                         USB_RECIP_INTERFACE))
444                         return -ENOTSUPP;
445
446                 if (w_length < 1)
447                         return -EINVAL;
448                 if (w_value != 0)
449                         return -EINVAL;
450                 luns = atomic_read(&fu->tpg->tpg_port_count);
451                 if (!luns) {
452                         pr_err("No LUNs configured?\n");
453                         return -EINVAL;
454                 }
455                 /*
456                  * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
457                  * accessed. The upper limit is 0xf
458                  */
459                 luns--;
460                 if (luns > 0xf) {
461                         pr_info_once("Limiting the number of luns to 16\n");
462                         luns = 0xf;
463                 }
464                 ret_lun = cdev->req->buf;
465                 *ret_lun = luns;
466                 cdev->req->length = 1;
467                 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
468                 break;
469
470         case US_BULK_RESET_REQUEST:
471                 /* XXX maybe we should remove previous requests for IN + OUT */
472                 bot_enqueue_cmd_cbw(fu);
473                 return 0;
474                 break;
475         };
476         return -ENOTSUPP;
477 }
478
479 /* Start uas.c code */
480
481 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
482 {
483         /* We have either all three allocated or none */
484         if (!stream->req_in)
485                 return;
486
487         usb_ep_free_request(fu->ep_in, stream->req_in);
488         usb_ep_free_request(fu->ep_out, stream->req_out);
489         usb_ep_free_request(fu->ep_status, stream->req_status);
490
491         stream->req_in = NULL;
492         stream->req_out = NULL;
493         stream->req_status = NULL;
494 }
495
496 static void uasp_free_cmdreq(struct f_uas *fu)
497 {
498         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
499         kfree(fu->cmd.buf);
500         fu->cmd.req = NULL;
501         fu->cmd.buf = NULL;
502 }
503
504 static void uasp_cleanup_old_alt(struct f_uas *fu)
505 {
506         int i;
507
508         if (!(fu->flags & USBG_ENABLED))
509                 return;
510
511         usb_ep_disable(fu->ep_in);
512         usb_ep_disable(fu->ep_out);
513         usb_ep_disable(fu->ep_status);
514         usb_ep_disable(fu->ep_cmd);
515
516         for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
517                 uasp_cleanup_one_stream(fu, &fu->stream[i]);
518         uasp_free_cmdreq(fu);
519 }
520
521 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
522
523 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
524 {
525         struct se_cmd *se_cmd = &cmd->se_cmd;
526         struct f_uas *fu = cmd->fu;
527         struct usb_gadget *gadget = fuas_to_gadget(fu);
528         struct uas_stream *stream = cmd->stream;
529
530         if (!gadget->sg_supported) {
531                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
532                 if (!cmd->data_buf)
533                         return -ENOMEM;
534
535                 sg_copy_to_buffer(se_cmd->t_data_sg,
536                                 se_cmd->t_data_nents,
537                                 cmd->data_buf,
538                                 se_cmd->data_length);
539
540                 stream->req_in->buf = cmd->data_buf;
541         } else {
542                 stream->req_in->buf = NULL;
543                 stream->req_in->num_sgs = se_cmd->t_data_nents;
544                 stream->req_in->sg = se_cmd->t_data_sg;
545         }
546
547         stream->req_in->complete = uasp_status_data_cmpl;
548         stream->req_in->length = se_cmd->data_length;
549         stream->req_in->context = cmd;
550
551         cmd->state = UASP_SEND_STATUS;
552         return 0;
553 }
554
555 static void uasp_prepare_status(struct usbg_cmd *cmd)
556 {
557         struct se_cmd *se_cmd = &cmd->se_cmd;
558         struct sense_iu *iu = &cmd->sense_iu;
559         struct uas_stream *stream = cmd->stream;
560
561         cmd->state = UASP_QUEUE_COMMAND;
562         iu->iu_id = IU_ID_STATUS;
563         iu->tag = cpu_to_be16(cmd->tag);
564
565         /*
566          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
567          */
568         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
569         iu->status = se_cmd->scsi_status;
570         stream->req_status->context = cmd;
571         stream->req_status->length = se_cmd->scsi_sense_length + 16;
572         stream->req_status->buf = iu;
573         stream->req_status->complete = uasp_status_data_cmpl;
574 }
575
576 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
577 {
578         struct usbg_cmd *cmd = req->context;
579         struct uas_stream *stream = cmd->stream;
580         struct f_uas *fu = cmd->fu;
581         int ret;
582
583         if (req->status < 0)
584                 goto cleanup;
585
586         switch (cmd->state) {
587         case UASP_SEND_DATA:
588                 ret = uasp_prepare_r_request(cmd);
589                 if (ret)
590                         goto cleanup;
591                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
592                 if (ret)
593                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
594                 break;
595
596         case UASP_RECEIVE_DATA:
597                 ret = usbg_prepare_w_request(cmd, stream->req_out);
598                 if (ret)
599                         goto cleanup;
600                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
601                 if (ret)
602                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
603                 break;
604
605         case UASP_SEND_STATUS:
606                 uasp_prepare_status(cmd);
607                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
608                                 GFP_ATOMIC);
609                 if (ret)
610                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
611                 break;
612
613         case UASP_QUEUE_COMMAND:
614                 usbg_cleanup_cmd(cmd);
615                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
616                 break;
617
618         default:
619                 BUG();
620         };
621         return;
622
623 cleanup:
624         usbg_cleanup_cmd(cmd);
625 }
626
627 static int uasp_send_status_response(struct usbg_cmd *cmd)
628 {
629         struct f_uas *fu = cmd->fu;
630         struct uas_stream *stream = cmd->stream;
631         struct sense_iu *iu = &cmd->sense_iu;
632
633         iu->tag = cpu_to_be16(cmd->tag);
634         stream->req_status->complete = uasp_status_data_cmpl;
635         stream->req_status->context = cmd;
636         cmd->fu = fu;
637         uasp_prepare_status(cmd);
638         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
639 }
640
641 static int uasp_send_read_response(struct usbg_cmd *cmd)
642 {
643         struct f_uas *fu = cmd->fu;
644         struct uas_stream *stream = cmd->stream;
645         struct sense_iu *iu = &cmd->sense_iu;
646         int ret;
647
648         cmd->fu = fu;
649
650         iu->tag = cpu_to_be16(cmd->tag);
651         if (fu->flags & USBG_USE_STREAMS) {
652
653                 ret = uasp_prepare_r_request(cmd);
654                 if (ret)
655                         goto out;
656                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
657                 if (ret) {
658                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
659                         kfree(cmd->data_buf);
660                         cmd->data_buf = NULL;
661                 }
662
663         } else {
664
665                 iu->iu_id = IU_ID_READ_READY;
666                 iu->tag = cpu_to_be16(cmd->tag);
667
668                 stream->req_status->complete = uasp_status_data_cmpl;
669                 stream->req_status->context = cmd;
670
671                 cmd->state = UASP_SEND_DATA;
672                 stream->req_status->buf = iu;
673                 stream->req_status->length = sizeof(struct iu);
674
675                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
676                                 GFP_ATOMIC);
677                 if (ret)
678                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
679         }
680 out:
681         return ret;
682 }
683
684 static int uasp_send_write_request(struct usbg_cmd *cmd)
685 {
686         struct f_uas *fu = cmd->fu;
687         struct se_cmd *se_cmd = &cmd->se_cmd;
688         struct uas_stream *stream = cmd->stream;
689         struct sense_iu *iu = &cmd->sense_iu;
690         int ret;
691
692         init_completion(&cmd->write_complete);
693         cmd->fu = fu;
694
695         iu->tag = cpu_to_be16(cmd->tag);
696
697         if (fu->flags & USBG_USE_STREAMS) {
698
699                 ret = usbg_prepare_w_request(cmd, stream->req_out);
700                 if (ret)
701                         goto cleanup;
702                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
703                 if (ret)
704                         pr_err("%s(%d)\n", __func__, __LINE__);
705
706         } else {
707
708                 iu->iu_id = IU_ID_WRITE_READY;
709                 iu->tag = cpu_to_be16(cmd->tag);
710
711                 stream->req_status->complete = uasp_status_data_cmpl;
712                 stream->req_status->context = cmd;
713
714                 cmd->state = UASP_RECEIVE_DATA;
715                 stream->req_status->buf = iu;
716                 stream->req_status->length = sizeof(struct iu);
717
718                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
719                                 GFP_ATOMIC);
720                 if (ret)
721                         pr_err("%s(%d)\n", __func__, __LINE__);
722         }
723
724         wait_for_completion(&cmd->write_complete);
725         target_execute_cmd(se_cmd);
726 cleanup:
727         return ret;
728 }
729
730 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
731
732 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
733 {
734         struct f_uas *fu = req->context;
735         int ret;
736
737         if (req->status < 0)
738                 return;
739
740         ret = usbg_submit_command(fu, req->buf, req->actual);
741         /*
742          * Once we tune for performance enqueue the command req here again so
743          * we can receive a second command while we processing this one. Pay
744          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
745          * don't break HS.
746          */
747         if (!ret)
748                 return;
749         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
750 }
751
752 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
753 {
754         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
755         if (!stream->req_in)
756                 goto out;
757
758         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
759         if (!stream->req_out)
760                 goto err_out;
761
762         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
763         if (!stream->req_status)
764                 goto err_sts;
765
766         return 0;
767 err_sts:
768         usb_ep_free_request(fu->ep_status, stream->req_status);
769         stream->req_status = NULL;
770 err_out:
771         usb_ep_free_request(fu->ep_out, stream->req_out);
772         stream->req_out = NULL;
773 out:
774         return -ENOMEM;
775 }
776
777 static int uasp_alloc_cmd(struct f_uas *fu)
778 {
779         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
780         if (!fu->cmd.req)
781                 goto err;
782
783         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
784         if (!fu->cmd.buf)
785                 goto err_buf;
786
787         fu->cmd.req->complete = uasp_cmd_complete;
788         fu->cmd.req->buf = fu->cmd.buf;
789         fu->cmd.req->length = fu->ep_cmd->maxpacket;
790         fu->cmd.req->context = fu;
791         return 0;
792
793 err_buf:
794         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
795 err:
796         return -ENOMEM;
797 }
798
799 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
800 {
801         int i;
802
803         for (i = 0; i < max_streams; i++) {
804                 struct uas_stream *s = &fu->stream[i];
805
806                 s->req_in->stream_id = i + 1;
807                 s->req_out->stream_id = i + 1;
808                 s->req_status->stream_id = i + 1;
809         }
810 }
811
812 static int uasp_prepare_reqs(struct f_uas *fu)
813 {
814         int ret;
815         int i;
816         int max_streams;
817
818         if (fu->flags & USBG_USE_STREAMS)
819                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
820         else
821                 max_streams = 1;
822
823         for (i = 0; i < max_streams; i++) {
824                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
825                 if (ret)
826                         goto err_cleanup;
827         }
828
829         ret = uasp_alloc_cmd(fu);
830         if (ret)
831                 goto err_free_stream;
832         uasp_setup_stream_res(fu, max_streams);
833
834         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
835         if (ret)
836                 goto err_free_stream;
837
838         return 0;
839
840 err_free_stream:
841         uasp_free_cmdreq(fu);
842
843 err_cleanup:
844         if (i) {
845                 do {
846                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
847                         i--;
848                 } while (i);
849         }
850         pr_err("UASP: endpoint setup failed\n");
851         return ret;
852 }
853
854 static void uasp_set_alt(struct f_uas *fu)
855 {
856         struct usb_function *f = &fu->function;
857         struct usb_gadget *gadget = f->config->cdev->gadget;
858         int ret;
859
860         fu->flags = USBG_IS_UAS;
861
862         if (gadget->speed == USB_SPEED_SUPER)
863                 fu->flags |= USBG_USE_STREAMS;
864
865         config_ep_by_speed(gadget, f, fu->ep_in);
866         ret = usb_ep_enable(fu->ep_in);
867         if (ret)
868                 goto err_b_in;
869
870         config_ep_by_speed(gadget, f, fu->ep_out);
871         ret = usb_ep_enable(fu->ep_out);
872         if (ret)
873                 goto err_b_out;
874
875         config_ep_by_speed(gadget, f, fu->ep_cmd);
876         ret = usb_ep_enable(fu->ep_cmd);
877         if (ret)
878                 goto err_cmd;
879         config_ep_by_speed(gadget, f, fu->ep_status);
880         ret = usb_ep_enable(fu->ep_status);
881         if (ret)
882                 goto err_status;
883
884         ret = uasp_prepare_reqs(fu);
885         if (ret)
886                 goto err_wq;
887         fu->flags |= USBG_ENABLED;
888
889         pr_info("Using the UAS protocol\n");
890         return;
891 err_wq:
892         usb_ep_disable(fu->ep_status);
893 err_status:
894         usb_ep_disable(fu->ep_cmd);
895 err_cmd:
896         usb_ep_disable(fu->ep_out);
897 err_b_out:
898         usb_ep_disable(fu->ep_in);
899 err_b_in:
900         fu->flags = 0;
901 }
902
903 static int get_cmd_dir(const unsigned char *cdb)
904 {
905         int ret;
906
907         switch (cdb[0]) {
908         case READ_6:
909         case READ_10:
910         case READ_12:
911         case READ_16:
912         case INQUIRY:
913         case MODE_SENSE:
914         case MODE_SENSE_10:
915         case SERVICE_ACTION_IN:
916         case MAINTENANCE_IN:
917         case PERSISTENT_RESERVE_IN:
918         case SECURITY_PROTOCOL_IN:
919         case ACCESS_CONTROL_IN:
920         case REPORT_LUNS:
921         case READ_BLOCK_LIMITS:
922         case READ_POSITION:
923         case READ_CAPACITY:
924         case READ_TOC:
925         case READ_FORMAT_CAPACITIES:
926         case REQUEST_SENSE:
927                 ret = DMA_FROM_DEVICE;
928                 break;
929
930         case WRITE_6:
931         case WRITE_10:
932         case WRITE_12:
933         case WRITE_16:
934         case MODE_SELECT:
935         case MODE_SELECT_10:
936         case WRITE_VERIFY:
937         case WRITE_VERIFY_12:
938         case PERSISTENT_RESERVE_OUT:
939         case MAINTENANCE_OUT:
940         case SECURITY_PROTOCOL_OUT:
941         case ACCESS_CONTROL_OUT:
942                 ret = DMA_TO_DEVICE;
943                 break;
944         case ALLOW_MEDIUM_REMOVAL:
945         case TEST_UNIT_READY:
946         case SYNCHRONIZE_CACHE:
947         case START_STOP:
948         case ERASE:
949         case REZERO_UNIT:
950         case SEEK_10:
951         case SPACE:
952         case VERIFY:
953         case WRITE_FILEMARKS:
954                 ret = DMA_NONE;
955                 break;
956         default:
957                 pr_warn("target: Unknown data direction for SCSI Opcode "
958                                 "0x%02x\n", cdb[0]);
959                 ret = -EINVAL;
960         }
961         return ret;
962 }
963
964 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
965 {
966         struct usbg_cmd *cmd = req->context;
967         struct se_cmd *se_cmd = &cmd->se_cmd;
968
969         if (req->status < 0) {
970                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
971                 goto cleanup;
972         }
973
974         if (req->num_sgs == 0) {
975                 sg_copy_from_buffer(se_cmd->t_data_sg,
976                                 se_cmd->t_data_nents,
977                                 cmd->data_buf,
978                                 se_cmd->data_length);
979         }
980
981         complete(&cmd->write_complete);
982         return;
983
984 cleanup:
985         usbg_cleanup_cmd(cmd);
986 }
987
988 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
989 {
990         struct se_cmd *se_cmd = &cmd->se_cmd;
991         struct f_uas *fu = cmd->fu;
992         struct usb_gadget *gadget = fuas_to_gadget(fu);
993
994         if (!gadget->sg_supported) {
995                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
996                 if (!cmd->data_buf)
997                         return -ENOMEM;
998
999                 req->buf = cmd->data_buf;
1000         } else {
1001                 req->buf = NULL;
1002                 req->num_sgs = se_cmd->t_data_nents;
1003                 req->sg = se_cmd->t_data_sg;
1004         }
1005
1006         req->complete = usbg_data_write_cmpl;
1007         req->length = se_cmd->data_length;
1008         req->context = cmd;
1009         return 0;
1010 }
1011
1012 static int usbg_send_status_response(struct se_cmd *se_cmd)
1013 {
1014         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015                         se_cmd);
1016         struct f_uas *fu = cmd->fu;
1017
1018         if (fu->flags & USBG_IS_BOT)
1019                 return bot_send_status_response(cmd);
1020         else
1021                 return uasp_send_status_response(cmd);
1022 }
1023
1024 static int usbg_send_write_request(struct se_cmd *se_cmd)
1025 {
1026         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027                         se_cmd);
1028         struct f_uas *fu = cmd->fu;
1029
1030         if (fu->flags & USBG_IS_BOT)
1031                 return bot_send_write_request(cmd);
1032         else
1033                 return uasp_send_write_request(cmd);
1034 }
1035
1036 static int usbg_send_read_response(struct se_cmd *se_cmd)
1037 {
1038         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1039                         se_cmd);
1040         struct f_uas *fu = cmd->fu;
1041
1042         if (fu->flags & USBG_IS_BOT)
1043                 return bot_send_read_response(cmd);
1044         else
1045                 return uasp_send_read_response(cmd);
1046 }
1047
1048 static void usbg_cmd_work(struct work_struct *work)
1049 {
1050         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1051         struct se_cmd *se_cmd;
1052         struct tcm_usbg_nexus *tv_nexus;
1053         struct usbg_tpg *tpg;
1054         int dir;
1055
1056         se_cmd = &cmd->se_cmd;
1057         tpg = cmd->fu->tpg;
1058         tv_nexus = tpg->tpg_nexus;
1059         dir = get_cmd_dir(cmd->cmd_buf);
1060         if (dir < 0) {
1061                 transport_init_se_cmd(se_cmd,
1062                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1063                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1064                                 cmd->prio_attr, cmd->sense_iu.sense);
1065                 goto out;
1066         }
1067
1068         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1069                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1070                         0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1071                 goto out;
1072
1073         return;
1074
1075 out:
1076         transport_send_check_condition_and_sense(se_cmd,
1077                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1078         usbg_cleanup_cmd(cmd);
1079 }
1080
1081 static int usbg_submit_command(struct f_uas *fu,
1082                 void *cmdbuf, unsigned int len)
1083 {
1084         struct command_iu *cmd_iu = cmdbuf;
1085         struct usbg_cmd *cmd;
1086         struct usbg_tpg *tpg;
1087         struct se_cmd *se_cmd;
1088         struct tcm_usbg_nexus *tv_nexus;
1089         u32 cmd_len;
1090         int ret;
1091
1092         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1093                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1094                 return -EINVAL;
1095         }
1096
1097         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1098         if (!cmd)
1099                 return -ENOMEM;
1100
1101         cmd->fu = fu;
1102
1103         /* XXX until I figure out why I can't free in on complete */
1104         kref_init(&cmd->ref);
1105         kref_get(&cmd->ref);
1106
1107         tpg = fu->tpg;
1108         cmd_len = (cmd_iu->len & ~0x3) + 16;
1109         if (cmd_len > USBG_MAX_CMD)
1110                 goto err;
1111
1112         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1113
1114         cmd->tag = be16_to_cpup(&cmd_iu->tag);
1115         if (fu->flags & USBG_USE_STREAMS) {
1116                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1117                         goto err;
1118                 if (!cmd->tag)
1119                         cmd->stream = &fu->stream[0];
1120                 else
1121                         cmd->stream = &fu->stream[cmd->tag - 1];
1122         } else {
1123                 cmd->stream = &fu->stream[0];
1124         }
1125
1126         tv_nexus = tpg->tpg_nexus;
1127         if (!tv_nexus) {
1128                 pr_err("Missing nexus, ignoring command\n");
1129                 goto err;
1130         }
1131
1132         switch (cmd_iu->prio_attr & 0x7) {
1133         case UAS_HEAD_TAG:
1134                 cmd->prio_attr = MSG_HEAD_TAG;
1135                 break;
1136         case UAS_ORDERED_TAG:
1137                 cmd->prio_attr = MSG_ORDERED_TAG;
1138                 break;
1139         case UAS_ACA:
1140                 cmd->prio_attr = MSG_ACA_TAG;
1141                 break;
1142         default:
1143                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1144                                 cmd_iu->prio_attr);
1145         case UAS_SIMPLE_TAG:
1146                 cmd->prio_attr = MSG_SIMPLE_TAG;
1147                 break;
1148         }
1149
1150         se_cmd = &cmd->se_cmd;
1151         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1152
1153         INIT_WORK(&cmd->work, usbg_cmd_work);
1154         ret = queue_work(tpg->workqueue, &cmd->work);
1155         if (ret < 0)
1156                 goto err;
1157
1158         return 0;
1159 err:
1160         kfree(cmd);
1161         return -EINVAL;
1162 }
1163
1164 static void bot_cmd_work(struct work_struct *work)
1165 {
1166         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167         struct se_cmd *se_cmd;
1168         struct tcm_usbg_nexus *tv_nexus;
1169         struct usbg_tpg *tpg;
1170         int dir;
1171
1172         se_cmd = &cmd->se_cmd;
1173         tpg = cmd->fu->tpg;
1174         tv_nexus = tpg->tpg_nexus;
1175         dir = get_cmd_dir(cmd->cmd_buf);
1176         if (dir < 0) {
1177                 transport_init_se_cmd(se_cmd,
1178                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180                                 cmd->prio_attr, cmd->sense_iu.sense);
1181                 goto out;
1182         }
1183
1184         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1185                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1186                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187                 goto out;
1188
1189         return;
1190
1191 out:
1192         transport_send_check_condition_and_sense(se_cmd,
1193                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194         usbg_cleanup_cmd(cmd);
1195 }
1196
1197 static int bot_submit_command(struct f_uas *fu,
1198                 void *cmdbuf, unsigned int len)
1199 {
1200         struct bulk_cb_wrap *cbw = cmdbuf;
1201         struct usbg_cmd *cmd;
1202         struct usbg_tpg *tpg;
1203         struct se_cmd *se_cmd;
1204         struct tcm_usbg_nexus *tv_nexus;
1205         u32 cmd_len;
1206         int ret;
1207
1208         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1209                 pr_err("Wrong signature on CBW\n");
1210                 return -EINVAL;
1211         }
1212         if (len != 31) {
1213                 pr_err("Wrong length for CBW\n");
1214                 return -EINVAL;
1215         }
1216
1217         cmd_len = cbw->Length;
1218         if (cmd_len < 1 || cmd_len > 16)
1219                 return -EINVAL;
1220
1221         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1222         if (!cmd)
1223                 return -ENOMEM;
1224
1225         cmd->fu = fu;
1226
1227         /* XXX until I figure out why I can't free in on complete */
1228         kref_init(&cmd->ref);
1229         kref_get(&cmd->ref);
1230
1231         tpg = fu->tpg;
1232
1233         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1234
1235         cmd->bot_tag = cbw->Tag;
1236
1237         tv_nexus = tpg->tpg_nexus;
1238         if (!tv_nexus) {
1239                 pr_err("Missing nexus, ignoring command\n");
1240                 goto err;
1241         }
1242
1243         cmd->prio_attr = MSG_SIMPLE_TAG;
1244         se_cmd = &cmd->se_cmd;
1245         cmd->unpacked_lun = cbw->Lun;
1246         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1247         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1248
1249         INIT_WORK(&cmd->work, bot_cmd_work);
1250         ret = queue_work(tpg->workqueue, &cmd->work);
1251         if (ret < 0)
1252                 goto err;
1253
1254         return 0;
1255 err:
1256         kfree(cmd);
1257         return -EINVAL;
1258 }
1259
1260 /* Start fabric.c code */
1261
1262 static int usbg_check_true(struct se_portal_group *se_tpg)
1263 {
1264         return 1;
1265 }
1266
1267 static int usbg_check_false(struct se_portal_group *se_tpg)
1268 {
1269         return 0;
1270 }
1271
1272 static char *usbg_get_fabric_name(void)
1273 {
1274         return "usb_gadget";
1275 }
1276
1277 static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1278 {
1279         struct usbg_tpg *tpg = container_of(se_tpg,
1280                                 struct usbg_tpg, se_tpg);
1281         struct usbg_tport *tport = tpg->tport;
1282         u8 proto_id;
1283
1284         switch (tport->tport_proto_id) {
1285         case SCSI_PROTOCOL_SAS:
1286         default:
1287                 proto_id = sas_get_fabric_proto_ident(se_tpg);
1288                 break;
1289         }
1290
1291         return proto_id;
1292 }
1293
1294 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1295 {
1296         struct usbg_tpg *tpg = container_of(se_tpg,
1297                                 struct usbg_tpg, se_tpg);
1298         struct usbg_tport *tport = tpg->tport;
1299
1300         return &tport->tport_name[0];
1301 }
1302
1303 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1304 {
1305         struct usbg_tpg *tpg = container_of(se_tpg,
1306                                 struct usbg_tpg, se_tpg);
1307         return tpg->tport_tpgt;
1308 }
1309
1310 static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1311 {
1312         return 1;
1313 }
1314
1315 static u32 usbg_get_pr_transport_id(
1316         struct se_portal_group *se_tpg,
1317         struct se_node_acl *se_nacl,
1318         struct t10_pr_registration *pr_reg,
1319         int *format_code,
1320         unsigned char *buf)
1321 {
1322         struct usbg_tpg *tpg = container_of(se_tpg,
1323                                 struct usbg_tpg, se_tpg);
1324         struct usbg_tport *tport = tpg->tport;
1325         int ret = 0;
1326
1327         switch (tport->tport_proto_id) {
1328         case SCSI_PROTOCOL_SAS:
1329         default:
1330                 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1331                                         format_code, buf);
1332                 break;
1333         }
1334
1335         return ret;
1336 }
1337
1338 static u32 usbg_get_pr_transport_id_len(
1339         struct se_portal_group *se_tpg,
1340         struct se_node_acl *se_nacl,
1341         struct t10_pr_registration *pr_reg,
1342         int *format_code)
1343 {
1344         struct usbg_tpg *tpg = container_of(se_tpg,
1345                                 struct usbg_tpg, se_tpg);
1346         struct usbg_tport *tport = tpg->tport;
1347         int ret = 0;
1348
1349         switch (tport->tport_proto_id) {
1350         case SCSI_PROTOCOL_SAS:
1351         default:
1352                 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1353                                         format_code);
1354                 break;
1355         }
1356
1357         return ret;
1358 }
1359
1360 static char *usbg_parse_pr_out_transport_id(
1361         struct se_portal_group *se_tpg,
1362         const char *buf,
1363         u32 *out_tid_len,
1364         char **port_nexus_ptr)
1365 {
1366         struct usbg_tpg *tpg = container_of(se_tpg,
1367                                 struct usbg_tpg, se_tpg);
1368         struct usbg_tport *tport = tpg->tport;
1369         char *tid = NULL;
1370
1371         switch (tport->tport_proto_id) {
1372         case SCSI_PROTOCOL_SAS:
1373         default:
1374                 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375                                         port_nexus_ptr);
1376         }
1377
1378         return tid;
1379 }
1380
1381 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1382 {
1383         struct usbg_nacl *nacl;
1384
1385         nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1386         if (!nacl) {
1387                 printk(KERN_ERR "Unable to alocate struct usbg_nacl\n");
1388                 return NULL;
1389         }
1390
1391         return &nacl->se_node_acl;
1392 }
1393
1394 static void usbg_release_fabric_acl(
1395         struct se_portal_group *se_tpg,
1396         struct se_node_acl *se_nacl)
1397 {
1398         struct usbg_nacl *nacl = container_of(se_nacl,
1399                         struct usbg_nacl, se_node_acl);
1400         kfree(nacl);
1401 }
1402
1403 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1404 {
1405         return 1;
1406 }
1407
1408 static void usbg_cmd_release(struct kref *ref)
1409 {
1410         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1411                         ref);
1412
1413         transport_generic_free_cmd(&cmd->se_cmd, 0);
1414 }
1415
1416 static void usbg_release_cmd(struct se_cmd *se_cmd)
1417 {
1418         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1419                         se_cmd);
1420         kfree(cmd->data_buf);
1421         kfree(cmd);
1422         return;
1423 }
1424
1425 static int usbg_shutdown_session(struct se_session *se_sess)
1426 {
1427         return 0;
1428 }
1429
1430 static void usbg_close_session(struct se_session *se_sess)
1431 {
1432         return;
1433 }
1434
1435 static u32 usbg_sess_get_index(struct se_session *se_sess)
1436 {
1437         return 0;
1438 }
1439
1440 /*
1441  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1442  */
1443 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1444 {
1445         return 0;
1446 }
1447
1448 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1449 {
1450         return;
1451 }
1452
1453 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1454 {
1455         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1456                         se_cmd);
1457         struct f_uas *fu = cmd->fu;
1458
1459         if (fu->flags & USBG_IS_BOT)
1460                 return le32_to_cpu(cmd->bot_tag);
1461         else
1462                 return cmd->tag;
1463 }
1464
1465 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1466 {
1467         return 0;
1468 }
1469
1470 static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1471 {
1472         return 0;
1473 }
1474
1475 static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
1476 {
1477         return 0;
1478 }
1479
1480 static u16 usbg_get_fabric_sense_len(void)
1481 {
1482         return 0;
1483 }
1484
1485 static const char *usbg_check_wwn(const char *name)
1486 {
1487         const char *n;
1488         unsigned int len;
1489
1490         n = strstr(name, "naa.");
1491         if (!n)
1492                 return NULL;
1493         n += 4;
1494         len = strlen(n);
1495         if (len == 0 || len > USBG_NAMELEN - 1)
1496                 return NULL;
1497         return n;
1498 }
1499
1500 static struct se_node_acl *usbg_make_nodeacl(
1501         struct se_portal_group *se_tpg,
1502         struct config_group *group,
1503         const char *name)
1504 {
1505         struct se_node_acl *se_nacl, *se_nacl_new;
1506         struct usbg_nacl *nacl;
1507         u64 wwpn = 0;
1508         u32 nexus_depth;
1509         const char *wnn_name;
1510
1511         wnn_name = usbg_check_wwn(name);
1512         if (!wnn_name)
1513                 return ERR_PTR(-EINVAL);
1514         se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1515         if (!(se_nacl_new))
1516                 return ERR_PTR(-ENOMEM);
1517
1518         nexus_depth = 1;
1519         /*
1520          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1521          * when converting a NodeACL from demo mode -> explict
1522          */
1523         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1524                                 name, nexus_depth);
1525         if (IS_ERR(se_nacl)) {
1526                 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1527                 return se_nacl;
1528         }
1529         /*
1530          * Locate our struct usbg_nacl and set the FC Nport WWPN
1531          */
1532         nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1533         nacl->iport_wwpn = wwpn;
1534         snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1535         return se_nacl;
1536 }
1537
1538 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1539 {
1540         struct usbg_nacl *nacl = container_of(se_acl,
1541                                 struct usbg_nacl, se_node_acl);
1542         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1543         kfree(nacl);
1544 }
1545
1546 struct usbg_tpg *the_only_tpg_I_currently_have;
1547
1548 static struct se_portal_group *usbg_make_tpg(
1549         struct se_wwn *wwn,
1550         struct config_group *group,
1551         const char *name)
1552 {
1553         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1554                         tport_wwn);
1555         struct usbg_tpg *tpg;
1556         unsigned long tpgt;
1557         int ret;
1558
1559         if (strstr(name, "tpgt_") != name)
1560                 return ERR_PTR(-EINVAL);
1561         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1562                 return ERR_PTR(-EINVAL);
1563         if (the_only_tpg_I_currently_have) {
1564                 pr_err("Until the gadget framework can't handle multiple\n");
1565                 pr_err("gadgets, you can't do this here.\n");
1566                 return ERR_PTR(-EBUSY);
1567         }
1568
1569         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1570         if (!tpg) {
1571                 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1572                 return ERR_PTR(-ENOMEM);
1573         }
1574         mutex_init(&tpg->tpg_mutex);
1575         atomic_set(&tpg->tpg_port_count, 0);
1576         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1577         if (!tpg->workqueue) {
1578                 kfree(tpg);
1579                 return NULL;
1580         }
1581
1582         tpg->tport = tport;
1583         tpg->tport_tpgt = tpgt;
1584
1585         ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1586                                 &tpg->se_tpg, tpg,
1587                                 TRANSPORT_TPG_TYPE_NORMAL);
1588         if (ret < 0) {
1589                 destroy_workqueue(tpg->workqueue);
1590                 kfree(tpg);
1591                 return NULL;
1592         }
1593         the_only_tpg_I_currently_have = tpg;
1594         return &tpg->se_tpg;
1595 }
1596
1597 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1598 {
1599         struct usbg_tpg *tpg = container_of(se_tpg,
1600                                 struct usbg_tpg, se_tpg);
1601
1602         core_tpg_deregister(se_tpg);
1603         destroy_workqueue(tpg->workqueue);
1604         kfree(tpg);
1605         the_only_tpg_I_currently_have = NULL;
1606 }
1607
1608 static struct se_wwn *usbg_make_tport(
1609         struct target_fabric_configfs *tf,
1610         struct config_group *group,
1611         const char *name)
1612 {
1613         struct usbg_tport *tport;
1614         const char *wnn_name;
1615         u64 wwpn = 0;
1616
1617         wnn_name = usbg_check_wwn(name);
1618         if (!wnn_name)
1619                 return ERR_PTR(-EINVAL);
1620
1621         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1622         if (!(tport)) {
1623                 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1624                 return ERR_PTR(-ENOMEM);
1625         }
1626         tport->tport_wwpn = wwpn;
1627         snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
1628         return &tport->tport_wwn;
1629 }
1630
1631 static void usbg_drop_tport(struct se_wwn *wwn)
1632 {
1633         struct usbg_tport *tport = container_of(wwn,
1634                                 struct usbg_tport, tport_wwn);
1635         kfree(tport);
1636 }
1637
1638 /*
1639  * If somebody feels like dropping the version property, go ahead.
1640  */
1641 static ssize_t usbg_wwn_show_attr_version(
1642         struct target_fabric_configfs *tf,
1643         char *page)
1644 {
1645         return sprintf(page, "usb-gadget fabric module\n");
1646 }
1647 TF_WWN_ATTR_RO(usbg, version);
1648
1649 static struct configfs_attribute *usbg_wwn_attrs[] = {
1650         &usbg_wwn_version.attr,
1651         NULL,
1652 };
1653
1654 static ssize_t tcm_usbg_tpg_show_enable(
1655                 struct se_portal_group *se_tpg,
1656                 char *page)
1657 {
1658         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1659
1660         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1661 }
1662
1663 static int usbg_attach(struct usbg_tpg *);
1664 static void usbg_detach(struct usbg_tpg *);
1665
1666 static ssize_t tcm_usbg_tpg_store_enable(
1667                 struct se_portal_group *se_tpg,
1668                 const char *page,
1669                 size_t count)
1670 {
1671         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1672         unsigned long op;
1673         ssize_t ret;
1674
1675         ret = kstrtoul(page, 0, &op);
1676         if (ret < 0)
1677                 return -EINVAL;
1678         if (op > 1)
1679                 return -EINVAL;
1680
1681         if (op && tpg->gadget_connect)
1682                 goto out;
1683         if (!op && !tpg->gadget_connect)
1684                 goto out;
1685
1686         if (op) {
1687                 ret = usbg_attach(tpg);
1688                 if (ret)
1689                         goto out;
1690         } else {
1691                 usbg_detach(tpg);
1692         }
1693         tpg->gadget_connect = op;
1694 out:
1695         return count;
1696 }
1697 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1698
1699 static ssize_t tcm_usbg_tpg_show_nexus(
1700                 struct se_portal_group *se_tpg,
1701                 char *page)
1702 {
1703         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1704         struct tcm_usbg_nexus *tv_nexus;
1705         ssize_t ret;
1706
1707         mutex_lock(&tpg->tpg_mutex);
1708         tv_nexus = tpg->tpg_nexus;
1709         if (!tv_nexus) {
1710                 ret = -ENODEV;
1711                 goto out;
1712         }
1713         ret = snprintf(page, PAGE_SIZE, "%s\n",
1714                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1715 out:
1716         mutex_unlock(&tpg->tpg_mutex);
1717         return ret;
1718 }
1719
1720 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1721 {
1722         struct se_portal_group *se_tpg;
1723         struct tcm_usbg_nexus *tv_nexus;
1724         int ret;
1725
1726         mutex_lock(&tpg->tpg_mutex);
1727         if (tpg->tpg_nexus) {
1728                 ret = -EEXIST;
1729                 pr_debug("tpg->tpg_nexus already exists\n");
1730                 goto err_unlock;
1731         }
1732         se_tpg = &tpg->se_tpg;
1733
1734         ret = -ENOMEM;
1735         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1736         if (!tv_nexus) {
1737                 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1738                 goto err_unlock;
1739         }
1740         tv_nexus->tvn_se_sess = transport_init_session();
1741         if (IS_ERR(tv_nexus->tvn_se_sess))
1742                 goto err_free;
1743
1744         /*
1745          * Since we are running in 'demo mode' this call with generate a
1746          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1747          * the SCSI Initiator port name of the passed configfs group 'name'.
1748          */
1749         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1750                         se_tpg, name);
1751         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1752                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1753                                 " for %s\n", name);
1754                 goto err_session;
1755         }
1756         /*
1757          * Now register the TCM vHost virtual I_T Nexus as active with the
1758          * call to __transport_register_session()
1759          */
1760         __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1761                         tv_nexus->tvn_se_sess, tv_nexus);
1762         tpg->tpg_nexus = tv_nexus;
1763         mutex_unlock(&tpg->tpg_mutex);
1764         return 0;
1765
1766 err_session:
1767         transport_free_session(tv_nexus->tvn_se_sess);
1768 err_free:
1769         kfree(tv_nexus);
1770 err_unlock:
1771         mutex_unlock(&tpg->tpg_mutex);
1772         return ret;
1773 }
1774
1775 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1776 {
1777         struct se_session *se_sess;
1778         struct tcm_usbg_nexus *tv_nexus;
1779         int ret = -ENODEV;
1780
1781         mutex_lock(&tpg->tpg_mutex);
1782         tv_nexus = tpg->tpg_nexus;
1783         if (!tv_nexus)
1784                 goto out;
1785
1786         se_sess = tv_nexus->tvn_se_sess;
1787         if (!se_sess)
1788                 goto out;
1789
1790         if (atomic_read(&tpg->tpg_port_count)) {
1791                 ret = -EPERM;
1792                 pr_err("Unable to remove Host I_T Nexus with"
1793                                 " active TPG port count: %d\n",
1794                                 atomic_read(&tpg->tpg_port_count));
1795                 goto out;
1796         }
1797
1798         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1799                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1800         /*
1801          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1802          */
1803         transport_deregister_session(tv_nexus->tvn_se_sess);
1804         tpg->tpg_nexus = NULL;
1805
1806         kfree(tv_nexus);
1807 out:
1808         mutex_unlock(&tpg->tpg_mutex);
1809         return 0;
1810 }
1811
1812 static ssize_t tcm_usbg_tpg_store_nexus(
1813                 struct se_portal_group *se_tpg,
1814                 const char *page,
1815                 size_t count)
1816 {
1817         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1818         unsigned char i_port[USBG_NAMELEN], *ptr;
1819         int ret;
1820
1821         if (!strncmp(page, "NULL", 4)) {
1822                 ret = tcm_usbg_drop_nexus(tpg);
1823                 return (!ret) ? count : ret;
1824         }
1825         if (strlen(page) > USBG_NAMELEN) {
1826                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1827                                 " max: %d\n", page, USBG_NAMELEN);
1828                 return -EINVAL;
1829         }
1830         snprintf(i_port, USBG_NAMELEN, "%s", page);
1831
1832         ptr = strstr(i_port, "naa.");
1833         if (!ptr) {
1834                 pr_err("Missing 'naa.' prefix\n");
1835                 return -EINVAL;
1836         }
1837
1838         if (i_port[strlen(i_port) - 1] == '\n')
1839                 i_port[strlen(i_port) - 1] = '\0';
1840
1841         ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1842         if (ret < 0)
1843                 return ret;
1844         return count;
1845 }
1846 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1847
1848 static struct configfs_attribute *usbg_base_attrs[] = {
1849         &tcm_usbg_tpg_enable.attr,
1850         &tcm_usbg_tpg_nexus.attr,
1851         NULL,
1852 };
1853
1854 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1855 {
1856         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1857
1858         atomic_inc(&tpg->tpg_port_count);
1859         smp_mb__after_atomic_inc();
1860         return 0;
1861 }
1862
1863 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1864                 struct se_lun *se_lun)
1865 {
1866         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1867
1868         atomic_dec(&tpg->tpg_port_count);
1869         smp_mb__after_atomic_dec();
1870 }
1871
1872 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1873 {
1874         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1875                         se_cmd);
1876
1877         kref_put(&cmd->ref, usbg_cmd_release);
1878         return 1;
1879 }
1880
1881 static struct target_core_fabric_ops usbg_ops = {
1882         .get_fabric_name                = usbg_get_fabric_name,
1883         .get_fabric_proto_ident         = usbg_get_fabric_proto_ident,
1884         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1885         .tpg_get_tag                    = usbg_get_tag,
1886         .tpg_get_default_depth          = usbg_get_default_depth,
1887         .tpg_get_pr_transport_id        = usbg_get_pr_transport_id,
1888         .tpg_get_pr_transport_id_len    = usbg_get_pr_transport_id_len,
1889         .tpg_parse_pr_out_transport_id  = usbg_parse_pr_out_transport_id,
1890         .tpg_check_demo_mode            = usbg_check_true,
1891         .tpg_check_demo_mode_cache      = usbg_check_false,
1892         .tpg_check_demo_mode_write_protect = usbg_check_false,
1893         .tpg_check_prod_mode_write_protect = usbg_check_false,
1894         .tpg_alloc_fabric_acl           = usbg_alloc_fabric_acl,
1895         .tpg_release_fabric_acl         = usbg_release_fabric_acl,
1896         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1897         .release_cmd                    = usbg_release_cmd,
1898         .shutdown_session               = usbg_shutdown_session,
1899         .close_session                  = usbg_close_session,
1900         .sess_get_index                 = usbg_sess_get_index,
1901         .sess_get_initiator_sid         = NULL,
1902         .write_pending                  = usbg_send_write_request,
1903         .write_pending_status           = usbg_write_pending_status,
1904         .set_default_node_attributes    = usbg_set_default_node_attrs,
1905         .get_task_tag                   = usbg_get_task_tag,
1906         .get_cmd_state                  = usbg_get_cmd_state,
1907         .queue_data_in                  = usbg_send_read_response,
1908         .queue_status                   = usbg_send_status_response,
1909         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1910         .get_fabric_sense_len           = usbg_get_fabric_sense_len,
1911         .set_fabric_sense_len           = usbg_set_fabric_sense_len,
1912         .check_stop_free                = usbg_check_stop_free,
1913
1914         .fabric_make_wwn                = usbg_make_tport,
1915         .fabric_drop_wwn                = usbg_drop_tport,
1916         .fabric_make_tpg                = usbg_make_tpg,
1917         .fabric_drop_tpg                = usbg_drop_tpg,
1918         .fabric_post_link               = usbg_port_link,
1919         .fabric_pre_unlink              = usbg_port_unlink,
1920         .fabric_make_np                 = NULL,
1921         .fabric_drop_np                 = NULL,
1922         .fabric_make_nodeacl            = usbg_make_nodeacl,
1923         .fabric_drop_nodeacl            = usbg_drop_nodeacl,
1924 };
1925
1926 static int usbg_register_configfs(void)
1927 {
1928         struct target_fabric_configfs *fabric;
1929         int ret;
1930
1931         fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1932         if (IS_ERR(fabric)) {
1933                 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1934                 return PTR_ERR(fabric);
1935         }
1936
1937         fabric->tf_ops = usbg_ops;
1938         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1939         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1940         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1941         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1942         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1943         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1944         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1945         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1946         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1947         ret = target_fabric_configfs_register(fabric);
1948         if (ret < 0) {
1949                 printk(KERN_ERR "target_fabric_configfs_register() failed"
1950                                 " for usb-gadget\n");
1951                 return ret;
1952         }
1953         usbg_fabric_configfs = fabric;
1954         return 0;
1955 };
1956
1957 static void usbg_deregister_configfs(void)
1958 {
1959         if (!(usbg_fabric_configfs))
1960                 return;
1961
1962         target_fabric_configfs_deregister(usbg_fabric_configfs);
1963         usbg_fabric_configfs = NULL;
1964 };
1965
1966 /* Start gadget.c code */
1967
1968 static struct usb_interface_descriptor bot_intf_desc = {
1969         .bLength =              sizeof(bot_intf_desc),
1970         .bDescriptorType =      USB_DT_INTERFACE,
1971         .bAlternateSetting =    0,
1972         .bNumEndpoints =        2,
1973         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1974         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1975         .bInterfaceSubClass =   USB_SC_SCSI,
1976         .bInterfaceProtocol =   USB_PR_BULK,
1977 };
1978
1979 static struct usb_interface_descriptor uasp_intf_desc = {
1980         .bLength =              sizeof(uasp_intf_desc),
1981         .bDescriptorType =      USB_DT_INTERFACE,
1982         .bNumEndpoints =        4,
1983         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1984         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1985         .bInterfaceSubClass =   USB_SC_SCSI,
1986         .bInterfaceProtocol =   USB_PR_UAS,
1987 };
1988
1989 static struct usb_endpoint_descriptor uasp_bi_desc = {
1990         .bLength =              USB_DT_ENDPOINT_SIZE,
1991         .bDescriptorType =      USB_DT_ENDPOINT,
1992         .bEndpointAddress =     USB_DIR_IN,
1993         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1994         .wMaxPacketSize =       cpu_to_le16(512),
1995 };
1996
1997 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1998         .bLength =              USB_DT_ENDPOINT_SIZE,
1999         .bDescriptorType =      USB_DT_ENDPOINT,
2000         .bEndpointAddress =     USB_DIR_IN,
2001         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2002 };
2003
2004 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
2005         .bLength =              sizeof(uasp_bi_pipe_desc),
2006         .bDescriptorType =      USB_DT_PIPE_USAGE,
2007         .bPipeID =              DATA_IN_PIPE_ID,
2008 };
2009
2010 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
2011         .bLength =              USB_DT_ENDPOINT_SIZE,
2012         .bDescriptorType =      USB_DT_ENDPOINT,
2013         .bEndpointAddress =     USB_DIR_IN,
2014         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2015         .wMaxPacketSize =       cpu_to_le16(1024),
2016 };
2017
2018 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2019         .bLength =              sizeof(uasp_bi_ep_comp_desc),
2020         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2021         .bMaxBurst =            0,
2022         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2023         .wBytesPerInterval =    0,
2024 };
2025
2026 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2027         .bLength =              sizeof(bot_bi_ep_comp_desc),
2028         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2029         .bMaxBurst =            0,
2030 };
2031
2032 static struct usb_endpoint_descriptor uasp_bo_desc = {
2033         .bLength =              USB_DT_ENDPOINT_SIZE,
2034         .bDescriptorType =      USB_DT_ENDPOINT,
2035         .bEndpointAddress =     USB_DIR_OUT,
2036         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2037         .wMaxPacketSize =       cpu_to_le16(512),
2038 };
2039
2040 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2041         .bLength =              USB_DT_ENDPOINT_SIZE,
2042         .bDescriptorType =      USB_DT_ENDPOINT,
2043         .bEndpointAddress =     USB_DIR_OUT,
2044         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2045 };
2046
2047 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2048         .bLength =              sizeof(uasp_bo_pipe_desc),
2049         .bDescriptorType =      USB_DT_PIPE_USAGE,
2050         .bPipeID =              DATA_OUT_PIPE_ID,
2051 };
2052
2053 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2054         .bLength =              USB_DT_ENDPOINT_SIZE,
2055         .bDescriptorType =      USB_DT_ENDPOINT,
2056         .bEndpointAddress =     USB_DIR_OUT,
2057         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2058         .wMaxPacketSize =       cpu_to_le16(0x400),
2059 };
2060
2061 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2062         .bLength =              sizeof(uasp_bo_ep_comp_desc),
2063         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2064         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2065 };
2066
2067 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2068         .bLength =              sizeof(bot_bo_ep_comp_desc),
2069         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2070 };
2071
2072 static struct usb_endpoint_descriptor uasp_status_desc = {
2073         .bLength =              USB_DT_ENDPOINT_SIZE,
2074         .bDescriptorType =      USB_DT_ENDPOINT,
2075         .bEndpointAddress =     USB_DIR_IN,
2076         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2077         .wMaxPacketSize =       cpu_to_le16(512),
2078 };
2079
2080 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2081         .bLength =              USB_DT_ENDPOINT_SIZE,
2082         .bDescriptorType =      USB_DT_ENDPOINT,
2083         .bEndpointAddress =     USB_DIR_IN,
2084         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2085 };
2086
2087 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2088         .bLength =              sizeof(uasp_status_pipe_desc),
2089         .bDescriptorType =      USB_DT_PIPE_USAGE,
2090         .bPipeID =              STATUS_PIPE_ID,
2091 };
2092
2093 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2094         .bLength =              USB_DT_ENDPOINT_SIZE,
2095         .bDescriptorType =      USB_DT_ENDPOINT,
2096         .bEndpointAddress =     USB_DIR_IN,
2097         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2098         .wMaxPacketSize =       cpu_to_le16(1024),
2099 };
2100
2101 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2102         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
2103         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2104         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2105 };
2106
2107 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2108         .bLength =              USB_DT_ENDPOINT_SIZE,
2109         .bDescriptorType =      USB_DT_ENDPOINT,
2110         .bEndpointAddress =     USB_DIR_OUT,
2111         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2112         .wMaxPacketSize =       cpu_to_le16(512),
2113 };
2114
2115 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2116         .bLength =              USB_DT_ENDPOINT_SIZE,
2117         .bDescriptorType =      USB_DT_ENDPOINT,
2118         .bEndpointAddress =     USB_DIR_OUT,
2119         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2120 };
2121
2122 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2123         .bLength =              sizeof(uasp_cmd_pipe_desc),
2124         .bDescriptorType =      USB_DT_PIPE_USAGE,
2125         .bPipeID =              CMD_PIPE_ID,
2126 };
2127
2128 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2129         .bLength =              USB_DT_ENDPOINT_SIZE,
2130         .bDescriptorType =      USB_DT_ENDPOINT,
2131         .bEndpointAddress =     USB_DIR_OUT,
2132         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2133         .wMaxPacketSize =       cpu_to_le16(1024),
2134 };
2135
2136 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2137         .bLength =              sizeof(uasp_cmd_comp_desc),
2138         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2139 };
2140
2141 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2142         (struct usb_descriptor_header *) &bot_intf_desc,
2143         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2144         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2145
2146         (struct usb_descriptor_header *) &uasp_intf_desc,
2147         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2148         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2149         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2150         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2151         (struct usb_descriptor_header *) &uasp_fs_status_desc,
2152         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2153         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2154         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2155 };
2156
2157 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2158         (struct usb_descriptor_header *) &bot_intf_desc,
2159         (struct usb_descriptor_header *) &uasp_bi_desc,
2160         (struct usb_descriptor_header *) &uasp_bo_desc,
2161
2162         (struct usb_descriptor_header *) &uasp_intf_desc,
2163         (struct usb_descriptor_header *) &uasp_bi_desc,
2164         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2165         (struct usb_descriptor_header *) &uasp_bo_desc,
2166         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2167         (struct usb_descriptor_header *) &uasp_status_desc,
2168         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2169         (struct usb_descriptor_header *) &uasp_cmd_desc,
2170         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2171         NULL,
2172 };
2173
2174 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2175         (struct usb_descriptor_header *) &bot_intf_desc,
2176         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2177         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2178         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2179         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2180
2181         (struct usb_descriptor_header *) &uasp_intf_desc,
2182         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2183         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2184         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2185         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2186         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2187         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2188         (struct usb_descriptor_header *) &uasp_ss_status_desc,
2189         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2190         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2191         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2192         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2193         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2194         NULL,
2195 };
2196
2197 #define UAS_VENDOR_ID   0x0525  /* NetChip */
2198 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
2199
2200 static struct usb_device_descriptor usbg_device_desc = {
2201         .bLength =              sizeof(usbg_device_desc),
2202         .bDescriptorType =      USB_DT_DEVICE,
2203         .bcdUSB =               cpu_to_le16(0x0200),
2204         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
2205         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
2206         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
2207         .bNumConfigurations =   1,
2208 };
2209
2210 static struct usb_string        usbg_us_strings[] = {
2211         [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2212         [USB_GADGET_PRODUCT_IDX].s      = "Target Product",
2213         [USB_GADGET_SERIAL_IDX].s       = "000000000001",
2214         [USB_G_STR_CONFIG].s            = "default config",
2215         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
2216         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
2217         { },
2218 };
2219
2220 static struct usb_gadget_strings usbg_stringtab = {
2221         .language = 0x0409,
2222         .strings = usbg_us_strings,
2223 };
2224
2225 static struct usb_gadget_strings *usbg_strings[] = {
2226         &usbg_stringtab,
2227         NULL,
2228 };
2229
2230 static int guas_unbind(struct usb_composite_dev *cdev)
2231 {
2232         return 0;
2233 }
2234
2235 static struct usb_configuration usbg_config_driver = {
2236         .label                  = "Linux Target",
2237         .bConfigurationValue    = 1,
2238         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2239 };
2240
2241 static void give_back_ep(struct usb_ep **pep)
2242 {
2243         struct usb_ep *ep = *pep;
2244         if (!ep)
2245                 return;
2246         ep->driver_data = NULL;
2247 }
2248
2249 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2250 {
2251         struct f_uas            *fu = to_f_uas(f);
2252         struct usb_gadget       *gadget = c->cdev->gadget;
2253         struct usb_ep           *ep;
2254         int                     iface;
2255
2256         iface = usb_interface_id(c, f);
2257         if (iface < 0)
2258                 return iface;
2259
2260         bot_intf_desc.bInterfaceNumber = iface;
2261         uasp_intf_desc.bInterfaceNumber = iface;
2262         fu->iface = iface;
2263         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2264                         &uasp_bi_ep_comp_desc);
2265         if (!ep)
2266                 goto ep_fail;
2267
2268         ep->driver_data = fu;
2269         fu->ep_in = ep;
2270
2271         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2272                         &uasp_bo_ep_comp_desc);
2273         if (!ep)
2274                 goto ep_fail;
2275         ep->driver_data = fu;
2276         fu->ep_out = ep;
2277
2278         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2279                         &uasp_status_in_ep_comp_desc);
2280         if (!ep)
2281                 goto ep_fail;
2282         ep->driver_data = fu;
2283         fu->ep_status = ep;
2284
2285         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2286                         &uasp_cmd_comp_desc);
2287         if (!ep)
2288                 goto ep_fail;
2289         ep->driver_data = fu;
2290         fu->ep_cmd = ep;
2291
2292         /* Assume endpoint addresses are the same for both speeds */
2293         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2294         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2295         uasp_status_desc.bEndpointAddress =
2296                 uasp_ss_status_desc.bEndpointAddress;
2297         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2298
2299         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2300         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2301         uasp_fs_status_desc.bEndpointAddress =
2302                 uasp_ss_status_desc.bEndpointAddress;
2303         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2304
2305         return 0;
2306 ep_fail:
2307         pr_err("Can't claim all required eps\n");
2308
2309         give_back_ep(&fu->ep_in);
2310         give_back_ep(&fu->ep_out);
2311         give_back_ep(&fu->ep_status);
2312         give_back_ep(&fu->ep_cmd);
2313         return -ENOTSUPP;
2314 }
2315
2316 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2317 {
2318         struct f_uas *fu = to_f_uas(f);
2319
2320         kfree(fu);
2321 }
2322
2323 struct guas_setup_wq {
2324         struct work_struct work;
2325         struct f_uas *fu;
2326         unsigned int alt;
2327 };
2328
2329 static void usbg_delayed_set_alt(struct work_struct *wq)
2330 {
2331         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2332                         work);
2333         struct f_uas *fu = work->fu;
2334         int alt = work->alt;
2335
2336         kfree(work);
2337
2338         if (fu->flags & USBG_IS_BOT)
2339                 bot_cleanup_old_alt(fu);
2340         if (fu->flags & USBG_IS_UAS)
2341                 uasp_cleanup_old_alt(fu);
2342
2343         if (alt == USB_G_ALT_INT_BBB)
2344                 bot_set_alt(fu);
2345         else if (alt == USB_G_ALT_INT_UAS)
2346                 uasp_set_alt(fu);
2347         usb_composite_setup_continue(fu->function.config->cdev);
2348 }
2349
2350 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2351 {
2352         struct f_uas *fu = to_f_uas(f);
2353
2354         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2355                 struct guas_setup_wq *work;
2356
2357                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2358                 if (!work)
2359                         return -ENOMEM;
2360                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2361                 work->fu = fu;
2362                 work->alt = alt;
2363                 schedule_work(&work->work);
2364                 return USB_GADGET_DELAYED_STATUS;
2365         }
2366         return -EOPNOTSUPP;
2367 }
2368
2369 static void usbg_disable(struct usb_function *f)
2370 {
2371         struct f_uas *fu = to_f_uas(f);
2372
2373         if (fu->flags & USBG_IS_UAS)
2374                 uasp_cleanup_old_alt(fu);
2375         else if (fu->flags & USBG_IS_BOT)
2376                 bot_cleanup_old_alt(fu);
2377         fu->flags = 0;
2378 }
2379
2380 static int usbg_setup(struct usb_function *f,
2381                 const struct usb_ctrlrequest *ctrl)
2382 {
2383         struct f_uas *fu = to_f_uas(f);
2384
2385         if (!(fu->flags & USBG_IS_BOT))
2386                 return -EOPNOTSUPP;
2387
2388         return usbg_bot_setup(f, ctrl);
2389 }
2390
2391 static int usbg_cfg_bind(struct usb_configuration *c)
2392 {
2393         struct f_uas *fu;
2394         int ret;
2395
2396         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2397         if (!fu)
2398                 return -ENOMEM;
2399         fu->function.name = "Target Function";
2400         fu->function.descriptors = uasp_fs_function_desc;
2401         fu->function.hs_descriptors = uasp_hs_function_desc;
2402         fu->function.ss_descriptors = uasp_ss_function_desc;
2403         fu->function.bind = usbg_bind;
2404         fu->function.unbind = usbg_unbind;
2405         fu->function.set_alt = usbg_set_alt;
2406         fu->function.setup = usbg_setup;
2407         fu->function.disable = usbg_disable;
2408         fu->tpg = the_only_tpg_I_currently_have;
2409
2410         bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2411         uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2412
2413         ret = usb_add_function(c, &fu->function);
2414         if (ret)
2415                 goto err;
2416
2417         return 0;
2418 err:
2419         kfree(fu);
2420         return ret;
2421 }
2422
2423 static int usb_target_bind(struct usb_composite_dev *cdev)
2424 {
2425         int ret;
2426
2427         ret = usb_string_ids_tab(cdev, usbg_us_strings);
2428         if (ret)
2429                 return ret;
2430
2431         usbg_device_desc.iManufacturer =
2432                 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2433         usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2434         usbg_device_desc.iSerialNumber =
2435                 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2436         usbg_config_driver.iConfiguration =
2437                 usbg_us_strings[USB_G_STR_CONFIG].id;
2438
2439         ret = usb_add_config(cdev, &usbg_config_driver,
2440                         usbg_cfg_bind);
2441         if (ret)
2442                 return ret;
2443         usb_composite_overwrite_options(cdev, &coverwrite);
2444         return 0;
2445 }
2446
2447 static __refdata struct usb_composite_driver usbg_driver = {
2448         .name           = "g_target",
2449         .dev            = &usbg_device_desc,
2450         .strings        = usbg_strings,
2451         .max_speed      = USB_SPEED_SUPER,
2452         .bind           = usb_target_bind,
2453         .unbind         = guas_unbind,
2454 };
2455
2456 static int usbg_attach(struct usbg_tpg *tpg)
2457 {
2458         return usb_composite_probe(&usbg_driver);
2459 }
2460
2461 static void usbg_detach(struct usbg_tpg *tpg)
2462 {
2463         usb_composite_unregister(&usbg_driver);
2464 }
2465
2466 static int __init usb_target_gadget_init(void)
2467 {
2468         int ret;
2469
2470         ret = usbg_register_configfs();
2471         return ret;
2472 }
2473 module_init(usb_target_gadget_init);
2474
2475 static void __exit usb_target_gadget_exit(void)
2476 {
2477         usbg_deregister_configfs();
2478 }
2479 module_exit(usb_target_gadget_exit);
2480
2481 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2482 MODULE_DESCRIPTION("usb-gadget fabric");
2483 MODULE_LICENSE("GPL v2");