drivers/usb/gadget/legacy/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 const struct target_core_fabric_ops usbg_ops;
  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 static 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_16:
 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 = TCM_HEAD_TAG;
1135                 break;
1136         case UAS_ORDERED_TAG:
1137                 cmd->prio_attr = TCM_ORDERED_TAG;
1138                 break;
1139         case UAS_ACA:
1140                 cmd->prio_attr = TCM_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 = TCM_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 = TCM_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_pr_transport_id(
1311         struct se_portal_group *se_tpg,
1312         struct se_node_acl *se_nacl,
1313         struct t10_pr_registration *pr_reg,
1314         int *format_code,
1315         unsigned char *buf)
1316 {
1317         struct usbg_tpg *tpg = container_of(se_tpg,
1318                                 struct usbg_tpg, se_tpg);
1319         struct usbg_tport *tport = tpg->tport;
1320         int ret = 0;
1321
1322         switch (tport->tport_proto_id) {
1323         case SCSI_PROTOCOL_SAS:
1324         default:
1325                 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1326                                         format_code, buf);
1327                 break;
1328         }
1329
1330         return ret;
1331 }
1332
1333 static u32 usbg_get_pr_transport_id_len(
1334         struct se_portal_group *se_tpg,
1335         struct se_node_acl *se_nacl,
1336         struct t10_pr_registration *pr_reg,
1337         int *format_code)
1338 {
1339         struct usbg_tpg *tpg = container_of(se_tpg,
1340                                 struct usbg_tpg, se_tpg);
1341         struct usbg_tport *tport = tpg->tport;
1342         int ret = 0;
1343
1344         switch (tport->tport_proto_id) {
1345         case SCSI_PROTOCOL_SAS:
1346         default:
1347                 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1348                                         format_code);
1349                 break;
1350         }
1351
1352         return ret;
1353 }
1354
1355 static char *usbg_parse_pr_out_transport_id(
1356         struct se_portal_group *se_tpg,
1357         const char *buf,
1358         u32 *out_tid_len,
1359         char **port_nexus_ptr)
1360 {
1361         struct usbg_tpg *tpg = container_of(se_tpg,
1362                                 struct usbg_tpg, se_tpg);
1363         struct usbg_tport *tport = tpg->tport;
1364         char *tid = NULL;
1365
1366         switch (tport->tport_proto_id) {
1367         case SCSI_PROTOCOL_SAS:
1368         default:
1369                 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1370                                         port_nexus_ptr);
1371         }
1372
1373         return tid;
1374 }
1375
1376 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1377 {
1378         return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL);
1379 }
1380
1381 static void usbg_release_fabric_acl(
1382         struct se_portal_group *se_tpg,
1383         struct se_node_acl *se_nacl)
1384 {
1385         kfree(se_nacl);
1386 }
1387
1388 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1389 {
1390         return 1;
1391 }
1392
1393 static void usbg_cmd_release(struct kref *ref)
1394 {
1395         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1396                         ref);
1397
1398         transport_generic_free_cmd(&cmd->se_cmd, 0);
1399 }
1400
1401 static void usbg_release_cmd(struct se_cmd *se_cmd)
1402 {
1403         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1404                         se_cmd);
1405         kfree(cmd->data_buf);
1406         kfree(cmd);
1407         return;
1408 }
1409
1410 static int usbg_shutdown_session(struct se_session *se_sess)
1411 {
1412         return 0;
1413 }
1414
1415 static void usbg_close_session(struct se_session *se_sess)
1416 {
1417         return;
1418 }
1419
1420 static u32 usbg_sess_get_index(struct se_session *se_sess)
1421 {
1422         return 0;
1423 }
1424
1425 /*
1426  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1427  */
1428 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1429 {
1430         return 0;
1431 }
1432
1433 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1434 {
1435         return;
1436 }
1437
1438 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1439 {
1440         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1441                         se_cmd);
1442         struct f_uas *fu = cmd->fu;
1443
1444         if (fu->flags & USBG_IS_BOT)
1445                 return le32_to_cpu(cmd->bot_tag);
1446         else
1447                 return cmd->tag;
1448 }
1449
1450 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1451 {
1452         return 0;
1453 }
1454
1455 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1456 {
1457 }
1458
1459 static void usbg_aborted_task(struct se_cmd *se_cmd)
1460 {
1461         return;
1462 }
1463
1464 static const char *usbg_check_wwn(const char *name)
1465 {
1466         const char *n;
1467         unsigned int len;
1468
1469         n = strstr(name, "naa.");
1470         if (!n)
1471                 return NULL;
1472         n += 4;
1473         len = strlen(n);
1474         if (len == 0 || len > USBG_NAMELEN - 1)
1475                 return NULL;
1476         return n;
1477 }
1478
1479 static struct se_node_acl *usbg_make_nodeacl(
1480         struct se_portal_group *se_tpg,
1481         struct config_group *group,
1482         const char *name)
1483 {
1484         struct se_node_acl *se_nacl, *se_nacl_new;
1485         u32 nexus_depth;
1486         const char *wnn_name;
1487
1488         wnn_name = usbg_check_wwn(name);
1489         if (!wnn_name)
1490                 return ERR_PTR(-EINVAL);
1491         se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1492         if (!(se_nacl_new))
1493                 return ERR_PTR(-ENOMEM);
1494
1495         nexus_depth = 1;
1496         /*
1497          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1498          * when converting a NodeACL from demo mode -> explict
1499          */
1500         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1501                                 name, nexus_depth);
1502         if (IS_ERR(se_nacl)) {
1503                 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1504                 return se_nacl;
1505         }
1506         return se_nacl;
1507 }
1508
1509 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1510 {
1511         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1512         kfree(se_acl);
1513 }
1514
1515 struct usbg_tpg *the_only_tpg_I_currently_have;
1516
1517 static struct se_portal_group *usbg_make_tpg(
1518         struct se_wwn *wwn,
1519         struct config_group *group,
1520         const char *name)
1521 {
1522         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1523                         tport_wwn);
1524         struct usbg_tpg *tpg;
1525         unsigned long tpgt;
1526         int ret;
1527
1528         if (strstr(name, "tpgt_") != name)
1529                 return ERR_PTR(-EINVAL);
1530         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1531                 return ERR_PTR(-EINVAL);
1532         if (the_only_tpg_I_currently_have) {
1533                 pr_err("Until the gadget framework can't handle multiple\n");
1534                 pr_err("gadgets, you can't do this here.\n");
1535                 return ERR_PTR(-EBUSY);
1536         }
1537
1538         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1539         if (!tpg)
1540                 return ERR_PTR(-ENOMEM);
1541         mutex_init(&tpg->tpg_mutex);
1542         atomic_set(&tpg->tpg_port_count, 0);
1543         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1544         if (!tpg->workqueue) {
1545                 kfree(tpg);
1546                 return NULL;
1547         }
1548
1549         tpg->tport = tport;
1550         tpg->tport_tpgt = tpgt;
1551
1552         ret = core_tpg_register(&usbg_ops, wwn, &tpg->se_tpg, tpg,
1553                                 TRANSPORT_TPG_TYPE_NORMAL);
1554         if (ret < 0) {
1555                 destroy_workqueue(tpg->workqueue);
1556                 kfree(tpg);
1557                 return NULL;
1558         }
1559         the_only_tpg_I_currently_have = tpg;
1560         return &tpg->se_tpg;
1561 }
1562
1563 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1564 {
1565         struct usbg_tpg *tpg = container_of(se_tpg,
1566                                 struct usbg_tpg, se_tpg);
1567
1568         core_tpg_deregister(se_tpg);
1569         destroy_workqueue(tpg->workqueue);
1570         kfree(tpg);
1571         the_only_tpg_I_currently_have = NULL;
1572 }
1573
1574 static struct se_wwn *usbg_make_tport(
1575         struct target_fabric_configfs *tf,
1576         struct config_group *group,
1577         const char *name)
1578 {
1579         struct usbg_tport *tport;
1580         const char *wnn_name;
1581         u64 wwpn = 0;
1582
1583         wnn_name = usbg_check_wwn(name);
1584         if (!wnn_name)
1585                 return ERR_PTR(-EINVAL);
1586
1587         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1588         if (!(tport))
1589                 return ERR_PTR(-ENOMEM);
1590         tport->tport_wwpn = wwpn;
1591         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1592         return &tport->tport_wwn;
1593 }
1594
1595 static void usbg_drop_tport(struct se_wwn *wwn)
1596 {
1597         struct usbg_tport *tport = container_of(wwn,
1598                                 struct usbg_tport, tport_wwn);
1599         kfree(tport);
1600 }
1601
1602 /*
1603  * If somebody feels like dropping the version property, go ahead.
1604  */
1605 static ssize_t usbg_wwn_show_attr_version(
1606         struct target_fabric_configfs *tf,
1607         char *page)
1608 {
1609         return sprintf(page, "usb-gadget fabric module\n");
1610 }
1611 TF_WWN_ATTR_RO(usbg, version);
1612
1613 static struct configfs_attribute *usbg_wwn_attrs[] = {
1614         &usbg_wwn_version.attr,
1615         NULL,
1616 };
1617
1618 static ssize_t tcm_usbg_tpg_show_enable(
1619                 struct se_portal_group *se_tpg,
1620                 char *page)
1621 {
1622         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1623
1624         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1625 }
1626
1627 static int usbg_attach(struct usbg_tpg *);
1628 static void usbg_detach(struct usbg_tpg *);
1629
1630 static ssize_t tcm_usbg_tpg_store_enable(
1631                 struct se_portal_group *se_tpg,
1632                 const char *page,
1633                 size_t count)
1634 {
1635         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1636         unsigned long op;
1637         ssize_t ret;
1638
1639         ret = kstrtoul(page, 0, &op);
1640         if (ret < 0)
1641                 return -EINVAL;
1642         if (op > 1)
1643                 return -EINVAL;
1644
1645         if (op && tpg->gadget_connect)
1646                 goto out;
1647         if (!op && !tpg->gadget_connect)
1648                 goto out;
1649
1650         if (op) {
1651                 ret = usbg_attach(tpg);
1652                 if (ret)
1653                         goto out;
1654         } else {
1655                 usbg_detach(tpg);
1656         }
1657         tpg->gadget_connect = op;
1658 out:
1659         return count;
1660 }
1661 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1662
1663 static ssize_t tcm_usbg_tpg_show_nexus(
1664                 struct se_portal_group *se_tpg,
1665                 char *page)
1666 {
1667         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1668         struct tcm_usbg_nexus *tv_nexus;
1669         ssize_t ret;
1670
1671         mutex_lock(&tpg->tpg_mutex);
1672         tv_nexus = tpg->tpg_nexus;
1673         if (!tv_nexus) {
1674                 ret = -ENODEV;
1675                 goto out;
1676         }
1677         ret = snprintf(page, PAGE_SIZE, "%s\n",
1678                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1679 out:
1680         mutex_unlock(&tpg->tpg_mutex);
1681         return ret;
1682 }
1683
1684 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1685 {
1686         struct se_portal_group *se_tpg;
1687         struct tcm_usbg_nexus *tv_nexus;
1688         int ret;
1689
1690         mutex_lock(&tpg->tpg_mutex);
1691         if (tpg->tpg_nexus) {
1692                 ret = -EEXIST;
1693                 pr_debug("tpg->tpg_nexus already exists\n");
1694                 goto err_unlock;
1695         }
1696         se_tpg = &tpg->se_tpg;
1697
1698         ret = -ENOMEM;
1699         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1700         if (!tv_nexus)
1701                 goto err_unlock;
1702         tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1703         if (IS_ERR(tv_nexus->tvn_se_sess))
1704                 goto err_free;
1705
1706         /*
1707          * Since we are running in 'demo mode' this call with generate a
1708          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1709          * the SCSI Initiator port name of the passed configfs group 'name'.
1710          */
1711         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1712                         se_tpg, name);
1713         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1714                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1715                                 " for %s\n", name);
1716                 goto err_session;
1717         }
1718         /*
1719          * Now register the TCM vHost virtual I_T Nexus as active.
1720          */
1721         transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1722                         tv_nexus->tvn_se_sess, tv_nexus);
1723         tpg->tpg_nexus = tv_nexus;
1724         mutex_unlock(&tpg->tpg_mutex);
1725         return 0;
1726
1727 err_session:
1728         transport_free_session(tv_nexus->tvn_se_sess);
1729 err_free:
1730         kfree(tv_nexus);
1731 err_unlock:
1732         mutex_unlock(&tpg->tpg_mutex);
1733         return ret;
1734 }
1735
1736 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1737 {
1738         struct se_session *se_sess;
1739         struct tcm_usbg_nexus *tv_nexus;
1740         int ret = -ENODEV;
1741
1742         mutex_lock(&tpg->tpg_mutex);
1743         tv_nexus = tpg->tpg_nexus;
1744         if (!tv_nexus)
1745                 goto out;
1746
1747         se_sess = tv_nexus->tvn_se_sess;
1748         if (!se_sess)
1749                 goto out;
1750
1751         if (atomic_read(&tpg->tpg_port_count)) {
1752                 ret = -EPERM;
1753                 pr_err("Unable to remove Host I_T Nexus with"
1754                                 " active TPG port count: %d\n",
1755                                 atomic_read(&tpg->tpg_port_count));
1756                 goto out;
1757         }
1758
1759         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1760                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1761         /*
1762          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1763          */
1764         transport_deregister_session(tv_nexus->tvn_se_sess);
1765         tpg->tpg_nexus = NULL;
1766
1767         kfree(tv_nexus);
1768         ret = 0;
1769 out:
1770         mutex_unlock(&tpg->tpg_mutex);
1771         return ret;
1772 }
1773
1774 static ssize_t tcm_usbg_tpg_store_nexus(
1775                 struct se_portal_group *se_tpg,
1776                 const char *page,
1777                 size_t count)
1778 {
1779         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1780         unsigned char i_port[USBG_NAMELEN], *ptr;
1781         int ret;
1782
1783         if (!strncmp(page, "NULL", 4)) {
1784                 ret = tcm_usbg_drop_nexus(tpg);
1785                 return (!ret) ? count : ret;
1786         }
1787         if (strlen(page) >= USBG_NAMELEN) {
1788                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1789                                 " max: %d\n", page, USBG_NAMELEN);
1790                 return -EINVAL;
1791         }
1792         snprintf(i_port, USBG_NAMELEN, "%s", page);
1793
1794         ptr = strstr(i_port, "naa.");
1795         if (!ptr) {
1796                 pr_err("Missing 'naa.' prefix\n");
1797                 return -EINVAL;
1798         }
1799
1800         if (i_port[strlen(i_port) - 1] == '\n')
1801                 i_port[strlen(i_port) - 1] = '\0';
1802
1803         ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1804         if (ret < 0)
1805                 return ret;
1806         return count;
1807 }
1808 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1809
1810 static struct configfs_attribute *usbg_base_attrs[] = {
1811         &tcm_usbg_tpg_enable.attr,
1812         &tcm_usbg_tpg_nexus.attr,
1813         NULL,
1814 };
1815
1816 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1817 {
1818         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1819
1820         atomic_inc(&tpg->tpg_port_count);
1821         smp_mb__after_atomic();
1822         return 0;
1823 }
1824
1825 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1826                 struct se_lun *se_lun)
1827 {
1828         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1829
1830         atomic_dec(&tpg->tpg_port_count);
1831         smp_mb__after_atomic();
1832 }
1833
1834 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1835 {
1836         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1837                         se_cmd);
1838
1839         kref_put(&cmd->ref, usbg_cmd_release);
1840         return 1;
1841 }
1842
1843 static const struct target_core_fabric_ops usbg_ops = {
1844         .module                         = THIS_MODULE,
1845         .name                           = "usb_gadget",
1846         .get_fabric_name                = usbg_get_fabric_name,
1847         .get_fabric_proto_ident         = usbg_get_fabric_proto_ident,
1848         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1849         .tpg_get_tag                    = usbg_get_tag,
1850         .tpg_get_pr_transport_id        = usbg_get_pr_transport_id,
1851         .tpg_get_pr_transport_id_len    = usbg_get_pr_transport_id_len,
1852         .tpg_parse_pr_out_transport_id  = usbg_parse_pr_out_transport_id,
1853         .tpg_check_demo_mode            = usbg_check_true,
1854         .tpg_check_demo_mode_cache      = usbg_check_false,
1855         .tpg_check_demo_mode_write_protect = usbg_check_false,
1856         .tpg_check_prod_mode_write_protect = usbg_check_false,
1857         .tpg_alloc_fabric_acl           = usbg_alloc_fabric_acl,
1858         .tpg_release_fabric_acl         = usbg_release_fabric_acl,
1859         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1860         .release_cmd                    = usbg_release_cmd,
1861         .shutdown_session               = usbg_shutdown_session,
1862         .close_session                  = usbg_close_session,
1863         .sess_get_index                 = usbg_sess_get_index,
1864         .sess_get_initiator_sid         = NULL,
1865         .write_pending                  = usbg_send_write_request,
1866         .write_pending_status           = usbg_write_pending_status,
1867         .set_default_node_attributes    = usbg_set_default_node_attrs,
1868         .get_task_tag                   = usbg_get_task_tag,
1869         .get_cmd_state                  = usbg_get_cmd_state,
1870         .queue_data_in                  = usbg_send_read_response,
1871         .queue_status                   = usbg_send_status_response,
1872         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1873         .aborted_task                   = usbg_aborted_task,
1874         .check_stop_free                = usbg_check_stop_free,
1875
1876         .fabric_make_wwn                = usbg_make_tport,
1877         .fabric_drop_wwn                = usbg_drop_tport,
1878         .fabric_make_tpg                = usbg_make_tpg,
1879         .fabric_drop_tpg                = usbg_drop_tpg,
1880         .fabric_post_link               = usbg_port_link,
1881         .fabric_pre_unlink              = usbg_port_unlink,
1882         .fabric_make_np                 = NULL,
1883         .fabric_drop_np                 = NULL,
1884         .fabric_make_nodeacl            = usbg_make_nodeacl,
1885         .fabric_drop_nodeacl            = usbg_drop_nodeacl,
1886
1887         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1888         .tfc_tpg_base_attrs             = usbg_base_attrs,
1889 };
1890
1891 /* Start gadget.c code */
1892
1893 static struct usb_interface_descriptor bot_intf_desc = {
1894         .bLength =              sizeof(bot_intf_desc),
1895         .bDescriptorType =      USB_DT_INTERFACE,
1896         .bNumEndpoints =        2,
1897         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1898         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1899         .bInterfaceSubClass =   USB_SC_SCSI,
1900         .bInterfaceProtocol =   USB_PR_BULK,
1901 };
1902
1903 static struct usb_interface_descriptor uasp_intf_desc = {
1904         .bLength =              sizeof(uasp_intf_desc),
1905         .bDescriptorType =      USB_DT_INTERFACE,
1906         .bNumEndpoints =        4,
1907         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1908         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1909         .bInterfaceSubClass =   USB_SC_SCSI,
1910         .bInterfaceProtocol =   USB_PR_UAS,
1911 };
1912
1913 static struct usb_endpoint_descriptor uasp_bi_desc = {
1914         .bLength =              USB_DT_ENDPOINT_SIZE,
1915         .bDescriptorType =      USB_DT_ENDPOINT,
1916         .bEndpointAddress =     USB_DIR_IN,
1917         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1918         .wMaxPacketSize =       cpu_to_le16(512),
1919 };
1920
1921 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1922         .bLength =              USB_DT_ENDPOINT_SIZE,
1923         .bDescriptorType =      USB_DT_ENDPOINT,
1924         .bEndpointAddress =     USB_DIR_IN,
1925         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1926 };
1927
1928 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1929         .bLength =              sizeof(uasp_bi_pipe_desc),
1930         .bDescriptorType =      USB_DT_PIPE_USAGE,
1931         .bPipeID =              DATA_IN_PIPE_ID,
1932 };
1933
1934 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1935         .bLength =              USB_DT_ENDPOINT_SIZE,
1936         .bDescriptorType =      USB_DT_ENDPOINT,
1937         .bEndpointAddress =     USB_DIR_IN,
1938         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1939         .wMaxPacketSize =       cpu_to_le16(1024),
1940 };
1941
1942 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1943         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1944         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1945         .bMaxBurst =            0,
1946         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1947         .wBytesPerInterval =    0,
1948 };
1949
1950 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1951         .bLength =              sizeof(bot_bi_ep_comp_desc),
1952         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1953         .bMaxBurst =            0,
1954 };
1955
1956 static struct usb_endpoint_descriptor uasp_bo_desc = {
1957         .bLength =              USB_DT_ENDPOINT_SIZE,
1958         .bDescriptorType =      USB_DT_ENDPOINT,
1959         .bEndpointAddress =     USB_DIR_OUT,
1960         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1961         .wMaxPacketSize =       cpu_to_le16(512),
1962 };
1963
1964 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1965         .bLength =              USB_DT_ENDPOINT_SIZE,
1966         .bDescriptorType =      USB_DT_ENDPOINT,
1967         .bEndpointAddress =     USB_DIR_OUT,
1968         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1969 };
1970
1971 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1972         .bLength =              sizeof(uasp_bo_pipe_desc),
1973         .bDescriptorType =      USB_DT_PIPE_USAGE,
1974         .bPipeID =              DATA_OUT_PIPE_ID,
1975 };
1976
1977 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1978         .bLength =              USB_DT_ENDPOINT_SIZE,
1979         .bDescriptorType =      USB_DT_ENDPOINT,
1980         .bEndpointAddress =     USB_DIR_OUT,
1981         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1982         .wMaxPacketSize =       cpu_to_le16(0x400),
1983 };
1984
1985 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1986         .bLength =              sizeof(uasp_bo_ep_comp_desc),
1987         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1988         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1989 };
1990
1991 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1992         .bLength =              sizeof(bot_bo_ep_comp_desc),
1993         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1994 };
1995
1996 static struct usb_endpoint_descriptor uasp_status_desc = {
1997         .bLength =              USB_DT_ENDPOINT_SIZE,
1998         .bDescriptorType =      USB_DT_ENDPOINT,
1999         .bEndpointAddress =     USB_DIR_IN,
2000         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2001         .wMaxPacketSize =       cpu_to_le16(512),
2002 };
2003
2004 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2005         .bLength =              USB_DT_ENDPOINT_SIZE,
2006         .bDescriptorType =      USB_DT_ENDPOINT,
2007         .bEndpointAddress =     USB_DIR_IN,
2008         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2009 };
2010
2011 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2012         .bLength =              sizeof(uasp_status_pipe_desc),
2013         .bDescriptorType =      USB_DT_PIPE_USAGE,
2014         .bPipeID =              STATUS_PIPE_ID,
2015 };
2016
2017 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2018         .bLength =              USB_DT_ENDPOINT_SIZE,
2019         .bDescriptorType =      USB_DT_ENDPOINT,
2020         .bEndpointAddress =     USB_DIR_IN,
2021         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2022         .wMaxPacketSize =       cpu_to_le16(1024),
2023 };
2024
2025 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2026         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
2027         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2028         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2029 };
2030
2031 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2032         .bLength =              USB_DT_ENDPOINT_SIZE,
2033         .bDescriptorType =      USB_DT_ENDPOINT,
2034         .bEndpointAddress =     USB_DIR_OUT,
2035         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2036         .wMaxPacketSize =       cpu_to_le16(512),
2037 };
2038
2039 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2040         .bLength =              USB_DT_ENDPOINT_SIZE,
2041         .bDescriptorType =      USB_DT_ENDPOINT,
2042         .bEndpointAddress =     USB_DIR_OUT,
2043         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2044 };
2045
2046 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2047         .bLength =              sizeof(uasp_cmd_pipe_desc),
2048         .bDescriptorType =      USB_DT_PIPE_USAGE,
2049         .bPipeID =              CMD_PIPE_ID,
2050 };
2051
2052 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2053         .bLength =              USB_DT_ENDPOINT_SIZE,
2054         .bDescriptorType =      USB_DT_ENDPOINT,
2055         .bEndpointAddress =     USB_DIR_OUT,
2056         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2057         .wMaxPacketSize =       cpu_to_le16(1024),
2058 };
2059
2060 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2061         .bLength =              sizeof(uasp_cmd_comp_desc),
2062         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2063 };
2064
2065 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2066         (struct usb_descriptor_header *) &bot_intf_desc,
2067         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2068         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2069
2070         (struct usb_descriptor_header *) &uasp_intf_desc,
2071         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2072         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2073         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2074         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2075         (struct usb_descriptor_header *) &uasp_fs_status_desc,
2076         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2077         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2078         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2079         NULL,
2080 };
2081
2082 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2083         (struct usb_descriptor_header *) &bot_intf_desc,
2084         (struct usb_descriptor_header *) &uasp_bi_desc,
2085         (struct usb_descriptor_header *) &uasp_bo_desc,
2086
2087         (struct usb_descriptor_header *) &uasp_intf_desc,
2088         (struct usb_descriptor_header *) &uasp_bi_desc,
2089         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2090         (struct usb_descriptor_header *) &uasp_bo_desc,
2091         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2092         (struct usb_descriptor_header *) &uasp_status_desc,
2093         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2094         (struct usb_descriptor_header *) &uasp_cmd_desc,
2095         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2096         NULL,
2097 };
2098
2099 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2100         (struct usb_descriptor_header *) &bot_intf_desc,
2101         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2102         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2103         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2104         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2105
2106         (struct usb_descriptor_header *) &uasp_intf_desc,
2107         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2108         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2109         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2110         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2111         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2112         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2113         (struct usb_descriptor_header *) &uasp_ss_status_desc,
2114         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2115         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2116         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2117         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2118         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2119         NULL,
2120 };
2121
2122 #define UAS_VENDOR_ID   0x0525  /* NetChip */
2123 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
2124
2125 static struct usb_device_descriptor usbg_device_desc = {
2126         .bLength =              sizeof(usbg_device_desc),
2127         .bDescriptorType =      USB_DT_DEVICE,
2128         .bcdUSB =               cpu_to_le16(0x0200),
2129         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
2130         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
2131         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
2132         .bNumConfigurations =   1,
2133 };
2134
2135 static struct usb_string        usbg_us_strings[] = {
2136         [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2137         [USB_GADGET_PRODUCT_IDX].s      = "Target Product",
2138         [USB_GADGET_SERIAL_IDX].s       = "000000000001",
2139         [USB_G_STR_CONFIG].s            = "default config",
2140         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
2141         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
2142         { },
2143 };
2144
2145 static struct usb_gadget_strings usbg_stringtab = {
2146         .language = 0x0409,
2147         .strings = usbg_us_strings,
2148 };
2149
2150 static struct usb_gadget_strings *usbg_strings[] = {
2151         &usbg_stringtab,
2152         NULL,
2153 };
2154
2155 static int guas_unbind(struct usb_composite_dev *cdev)
2156 {
2157         return 0;
2158 }
2159
2160 static struct usb_configuration usbg_config_driver = {
2161         .label                  = "Linux Target",
2162         .bConfigurationValue    = 1,
2163         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2164 };
2165
2166 static void give_back_ep(struct usb_ep **pep)
2167 {
2168         struct usb_ep *ep = *pep;
2169         if (!ep)
2170                 return;
2171         ep->driver_data = NULL;
2172 }
2173
2174 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2175 {
2176         struct f_uas            *fu = to_f_uas(f);
2177         struct usb_gadget       *gadget = c->cdev->gadget;
2178         struct usb_ep           *ep;
2179         int                     iface;
2180         int                     ret;
2181
2182         iface = usb_interface_id(c, f);
2183         if (iface < 0)
2184                 return iface;
2185
2186         bot_intf_desc.bInterfaceNumber = iface;
2187         uasp_intf_desc.bInterfaceNumber = iface;
2188         fu->iface = iface;
2189         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2190                         &uasp_bi_ep_comp_desc);
2191         if (!ep)
2192                 goto ep_fail;
2193
2194         ep->driver_data = fu;
2195         fu->ep_in = ep;
2196
2197         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2198                         &uasp_bo_ep_comp_desc);
2199         if (!ep)
2200                 goto ep_fail;
2201         ep->driver_data = fu;
2202         fu->ep_out = ep;
2203
2204         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2205                         &uasp_status_in_ep_comp_desc);
2206         if (!ep)
2207                 goto ep_fail;
2208         ep->driver_data = fu;
2209         fu->ep_status = ep;
2210
2211         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2212                         &uasp_cmd_comp_desc);
2213         if (!ep)
2214                 goto ep_fail;
2215         ep->driver_data = fu;
2216         fu->ep_cmd = ep;
2217
2218         /* Assume endpoint addresses are the same for both speeds */
2219         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2220         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2221         uasp_status_desc.bEndpointAddress =
2222                 uasp_ss_status_desc.bEndpointAddress;
2223         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2224
2225         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2226         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2227         uasp_fs_status_desc.bEndpointAddress =
2228                 uasp_ss_status_desc.bEndpointAddress;
2229         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2230
2231         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2232                         uasp_hs_function_desc, uasp_ss_function_desc);
2233         if (ret)
2234                 goto ep_fail;
2235
2236         return 0;
2237 ep_fail:
2238         pr_err("Can't claim all required eps\n");
2239
2240         give_back_ep(&fu->ep_in);
2241         give_back_ep(&fu->ep_out);
2242         give_back_ep(&fu->ep_status);
2243         give_back_ep(&fu->ep_cmd);
2244         return -ENOTSUPP;
2245 }
2246
2247 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2248 {
2249         struct f_uas *fu = to_f_uas(f);
2250
2251         usb_free_all_descriptors(f);
2252         kfree(fu);
2253 }
2254
2255 struct guas_setup_wq {
2256         struct work_struct work;
2257         struct f_uas *fu;
2258         unsigned int alt;
2259 };
2260
2261 static void usbg_delayed_set_alt(struct work_struct *wq)
2262 {
2263         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2264                         work);
2265         struct f_uas *fu = work->fu;
2266         int alt = work->alt;
2267
2268         kfree(work);
2269
2270         if (fu->flags & USBG_IS_BOT)
2271                 bot_cleanup_old_alt(fu);
2272         if (fu->flags & USBG_IS_UAS)
2273                 uasp_cleanup_old_alt(fu);
2274
2275         if (alt == USB_G_ALT_INT_BBB)
2276                 bot_set_alt(fu);
2277         else if (alt == USB_G_ALT_INT_UAS)
2278                 uasp_set_alt(fu);
2279         usb_composite_setup_continue(fu->function.config->cdev);
2280 }
2281
2282 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2283 {
2284         struct f_uas *fu = to_f_uas(f);
2285
2286         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2287                 struct guas_setup_wq *work;
2288
2289                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2290                 if (!work)
2291                         return -ENOMEM;
2292                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2293                 work->fu = fu;
2294                 work->alt = alt;
2295                 schedule_work(&work->work);
2296                 return USB_GADGET_DELAYED_STATUS;
2297         }
2298         return -EOPNOTSUPP;
2299 }
2300
2301 static void usbg_disable(struct usb_function *f)
2302 {
2303         struct f_uas *fu = to_f_uas(f);
2304
2305         if (fu->flags & USBG_IS_UAS)
2306                 uasp_cleanup_old_alt(fu);
2307         else if (fu->flags & USBG_IS_BOT)
2308                 bot_cleanup_old_alt(fu);
2309         fu->flags = 0;
2310 }
2311
2312 static int usbg_setup(struct usb_function *f,
2313                 const struct usb_ctrlrequest *ctrl)
2314 {
2315         struct f_uas *fu = to_f_uas(f);
2316
2317         if (!(fu->flags & USBG_IS_BOT))
2318                 return -EOPNOTSUPP;
2319
2320         return usbg_bot_setup(f, ctrl);
2321 }
2322
2323 static int usbg_cfg_bind(struct usb_configuration *c)
2324 {
2325         struct f_uas *fu;
2326         int ret;
2327
2328         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2329         if (!fu)
2330                 return -ENOMEM;
2331         fu->function.name = "Target Function";
2332         fu->function.bind = usbg_bind;
2333         fu->function.unbind = usbg_unbind;
2334         fu->function.set_alt = usbg_set_alt;
2335         fu->function.setup = usbg_setup;
2336         fu->function.disable = usbg_disable;
2337         fu->tpg = the_only_tpg_I_currently_have;
2338
2339         bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2340         uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2341
2342         ret = usb_add_function(c, &fu->function);
2343         if (ret)
2344                 goto err;
2345
2346         return 0;
2347 err:
2348         kfree(fu);
2349         return ret;
2350 }
2351
2352 static int usb_target_bind(struct usb_composite_dev *cdev)
2353 {
2354         int ret;
2355
2356         ret = usb_string_ids_tab(cdev, usbg_us_strings);
2357         if (ret)
2358                 return ret;
2359
2360         usbg_device_desc.iManufacturer =
2361                 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2362         usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2363         usbg_device_desc.iSerialNumber =
2364                 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2365         usbg_config_driver.iConfiguration =
2366                 usbg_us_strings[USB_G_STR_CONFIG].id;
2367
2368         ret = usb_add_config(cdev, &usbg_config_driver,
2369                         usbg_cfg_bind);
2370         if (ret)
2371                 return ret;
2372         usb_composite_overwrite_options(cdev, &coverwrite);
2373         return 0;
2374 }
2375
2376 static __refdata struct usb_composite_driver usbg_driver = {
2377         .name           = "g_target",
2378         .dev            = &usbg_device_desc,
2379         .strings        = usbg_strings,
2380         .max_speed      = USB_SPEED_SUPER,
2381         .bind           = usb_target_bind,
2382         .unbind         = guas_unbind,
2383 };
2384
2385 static int usbg_attach(struct usbg_tpg *tpg)
2386 {
2387         return usb_composite_probe(&usbg_driver);
2388 }
2389
2390 static void usbg_detach(struct usbg_tpg *tpg)
2391 {
2392         usb_composite_unregister(&usbg_driver);
2393 }
2394
2395 static int __init usb_target_gadget_init(void)
2396 {
2397         return target_register_template(&usbg_ops);
2398 }
2399 module_init(usb_target_gadget_init);
2400
2401 static void __exit usb_target_gadget_exit(void)
2402 {
2403         target_unregister_template(&usbg_ops);
2404 }
2405 module_exit(usb_target_gadget_exit);
2406
2407 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2408 MODULE_DESCRIPTION("usb-gadget fabric");
2409 MODULE_LICENSE("GPL v2");