kernel/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_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                 return NULL;
1388
1389         return &nacl->se_node_acl;
1390 }
1391
1392 static void usbg_release_fabric_acl(
1393         struct se_portal_group *se_tpg,
1394         struct se_node_acl *se_nacl)
1395 {
1396         struct usbg_nacl *nacl = container_of(se_nacl,
1397                         struct usbg_nacl, se_node_acl);
1398         kfree(nacl);
1399 }
1400
1401 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1402 {
1403         return 1;
1404 }
1405
1406 static void usbg_cmd_release(struct kref *ref)
1407 {
1408         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1409                         ref);
1410
1411         transport_generic_free_cmd(&cmd->se_cmd, 0);
1412 }
1413
1414 static void usbg_release_cmd(struct se_cmd *se_cmd)
1415 {
1416         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1417                         se_cmd);
1418         kfree(cmd->data_buf);
1419         kfree(cmd);
1420         return;
1421 }
1422
1423 static int usbg_shutdown_session(struct se_session *se_sess)
1424 {
1425         return 0;
1426 }
1427
1428 static void usbg_close_session(struct se_session *se_sess)
1429 {
1430         return;
1431 }
1432
1433 static u32 usbg_sess_get_index(struct se_session *se_sess)
1434 {
1435         return 0;
1436 }
1437
1438 /*
1439  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1440  */
1441 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1442 {
1443         return 0;
1444 }
1445
1446 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1447 {
1448         return;
1449 }
1450
1451 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1452 {
1453         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1454                         se_cmd);
1455         struct f_uas *fu = cmd->fu;
1456
1457         if (fu->flags & USBG_IS_BOT)
1458                 return le32_to_cpu(cmd->bot_tag);
1459         else
1460                 return cmd->tag;
1461 }
1462
1463 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1464 {
1465         return 0;
1466 }
1467
1468 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1469 {
1470 }
1471
1472 static void usbg_aborted_task(struct se_cmd *se_cmd)
1473 {
1474         return;
1475 }
1476
1477 static const char *usbg_check_wwn(const char *name)
1478 {
1479         const char *n;
1480         unsigned int len;
1481
1482         n = strstr(name, "naa.");
1483         if (!n)
1484                 return NULL;
1485         n += 4;
1486         len = strlen(n);
1487         if (len == 0 || len > USBG_NAMELEN - 1)
1488                 return NULL;
1489         return n;
1490 }
1491
1492 static struct se_node_acl *usbg_make_nodeacl(
1493         struct se_portal_group *se_tpg,
1494         struct config_group *group,
1495         const char *name)
1496 {
1497         struct se_node_acl *se_nacl, *se_nacl_new;
1498         struct usbg_nacl *nacl;
1499         u64 wwpn = 0;
1500         u32 nexus_depth;
1501         const char *wnn_name;
1502
1503         wnn_name = usbg_check_wwn(name);
1504         if (!wnn_name)
1505                 return ERR_PTR(-EINVAL);
1506         se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1507         if (!(se_nacl_new))
1508                 return ERR_PTR(-ENOMEM);
1509
1510         nexus_depth = 1;
1511         /*
1512          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1513          * when converting a NodeACL from demo mode -> explict
1514          */
1515         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1516                                 name, nexus_depth);
1517         if (IS_ERR(se_nacl)) {
1518                 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1519                 return se_nacl;
1520         }
1521         /*
1522          * Locate our struct usbg_nacl and set the FC Nport WWPN
1523          */
1524         nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1525         nacl->iport_wwpn = wwpn;
1526         snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1527         return se_nacl;
1528 }
1529
1530 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1531 {
1532         struct usbg_nacl *nacl = container_of(se_acl,
1533                                 struct usbg_nacl, se_node_acl);
1534         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1535         kfree(nacl);
1536 }
1537
1538 struct usbg_tpg *the_only_tpg_I_currently_have;
1539
1540 static struct se_portal_group *usbg_make_tpg(
1541         struct se_wwn *wwn,
1542         struct config_group *group,
1543         const char *name)
1544 {
1545         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1546                         tport_wwn);
1547         struct usbg_tpg *tpg;
1548         unsigned long tpgt;
1549         int ret;
1550
1551         if (strstr(name, "tpgt_") != name)
1552                 return ERR_PTR(-EINVAL);
1553         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1554                 return ERR_PTR(-EINVAL);
1555         if (the_only_tpg_I_currently_have) {
1556                 pr_err("Until the gadget framework can't handle multiple\n");
1557                 pr_err("gadgets, you can't do this here.\n");
1558                 return ERR_PTR(-EBUSY);
1559         }
1560
1561         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1562         if (!tpg)
1563                 return ERR_PTR(-ENOMEM);
1564         mutex_init(&tpg->tpg_mutex);
1565         atomic_set(&tpg->tpg_port_count, 0);
1566         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1567         if (!tpg->workqueue) {
1568                 kfree(tpg);
1569                 return NULL;
1570         }
1571
1572         tpg->tport = tport;
1573         tpg->tport_tpgt = tpgt;
1574
1575         ret = core_tpg_register(&usbg_ops, wwn, &tpg->se_tpg, tpg,
1576                                 TRANSPORT_TPG_TYPE_NORMAL);
1577         if (ret < 0) {
1578                 destroy_workqueue(tpg->workqueue);
1579                 kfree(tpg);
1580                 return NULL;
1581         }
1582         the_only_tpg_I_currently_have = tpg;
1583         return &tpg->se_tpg;
1584 }
1585
1586 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1587 {
1588         struct usbg_tpg *tpg = container_of(se_tpg,
1589                                 struct usbg_tpg, se_tpg);
1590
1591         core_tpg_deregister(se_tpg);
1592         destroy_workqueue(tpg->workqueue);
1593         kfree(tpg);
1594         the_only_tpg_I_currently_have = NULL;
1595 }
1596
1597 static struct se_wwn *usbg_make_tport(
1598         struct target_fabric_configfs *tf,
1599         struct config_group *group,
1600         const char *name)
1601 {
1602         struct usbg_tport *tport;
1603         const char *wnn_name;
1604         u64 wwpn = 0;
1605
1606         wnn_name = usbg_check_wwn(name);
1607         if (!wnn_name)
1608                 return ERR_PTR(-EINVAL);
1609
1610         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1611         if (!(tport))
1612                 return ERR_PTR(-ENOMEM);
1613         tport->tport_wwpn = wwpn;
1614         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1615         return &tport->tport_wwn;
1616 }
1617
1618 static void usbg_drop_tport(struct se_wwn *wwn)
1619 {
1620         struct usbg_tport *tport = container_of(wwn,
1621                                 struct usbg_tport, tport_wwn);
1622         kfree(tport);
1623 }
1624
1625 /*
1626  * If somebody feels like dropping the version property, go ahead.
1627  */
1628 static ssize_t usbg_wwn_show_attr_version(
1629         struct target_fabric_configfs *tf,
1630         char *page)
1631 {
1632         return sprintf(page, "usb-gadget fabric module\n");
1633 }
1634 TF_WWN_ATTR_RO(usbg, version);
1635
1636 static struct configfs_attribute *usbg_wwn_attrs[] = {
1637         &usbg_wwn_version.attr,
1638         NULL,
1639 };
1640
1641 static ssize_t tcm_usbg_tpg_show_enable(
1642                 struct se_portal_group *se_tpg,
1643                 char *page)
1644 {
1645         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1646
1647         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1648 }
1649
1650 static int usbg_attach(struct usbg_tpg *);
1651 static void usbg_detach(struct usbg_tpg *);
1652
1653 static ssize_t tcm_usbg_tpg_store_enable(
1654                 struct se_portal_group *se_tpg,
1655                 const char *page,
1656                 size_t count)
1657 {
1658         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1659         unsigned long op;
1660         ssize_t ret;
1661
1662         ret = kstrtoul(page, 0, &op);
1663         if (ret < 0)
1664                 return -EINVAL;
1665         if (op > 1)
1666                 return -EINVAL;
1667
1668         if (op && tpg->gadget_connect)
1669                 goto out;
1670         if (!op && !tpg->gadget_connect)
1671                 goto out;
1672
1673         if (op) {
1674                 ret = usbg_attach(tpg);
1675                 if (ret)
1676                         goto out;
1677         } else {
1678                 usbg_detach(tpg);
1679         }
1680         tpg->gadget_connect = op;
1681 out:
1682         return count;
1683 }
1684 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1685
1686 static ssize_t tcm_usbg_tpg_show_nexus(
1687                 struct se_portal_group *se_tpg,
1688                 char *page)
1689 {
1690         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1691         struct tcm_usbg_nexus *tv_nexus;
1692         ssize_t ret;
1693
1694         mutex_lock(&tpg->tpg_mutex);
1695         tv_nexus = tpg->tpg_nexus;
1696         if (!tv_nexus) {
1697                 ret = -ENODEV;
1698                 goto out;
1699         }
1700         ret = snprintf(page, PAGE_SIZE, "%s\n",
1701                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1702 out:
1703         mutex_unlock(&tpg->tpg_mutex);
1704         return ret;
1705 }
1706
1707 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1708 {
1709         struct se_portal_group *se_tpg;
1710         struct tcm_usbg_nexus *tv_nexus;
1711         int ret;
1712
1713         mutex_lock(&tpg->tpg_mutex);
1714         if (tpg->tpg_nexus) {
1715                 ret = -EEXIST;
1716                 pr_debug("tpg->tpg_nexus already exists\n");
1717                 goto err_unlock;
1718         }
1719         se_tpg = &tpg->se_tpg;
1720
1721         ret = -ENOMEM;
1722         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1723         if (!tv_nexus)
1724                 goto err_unlock;
1725         tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1726         if (IS_ERR(tv_nexus->tvn_se_sess))
1727                 goto err_free;
1728
1729         /*
1730          * Since we are running in 'demo mode' this call with generate a
1731          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1732          * the SCSI Initiator port name of the passed configfs group 'name'.
1733          */
1734         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1735                         se_tpg, name);
1736         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1737                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1738                                 " for %s\n", name);
1739                 goto err_session;
1740         }
1741         /*
1742          * Now register the TCM vHost virtual I_T Nexus as active.
1743          */
1744         transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1745                         tv_nexus->tvn_se_sess, tv_nexus);
1746         tpg->tpg_nexus = tv_nexus;
1747         mutex_unlock(&tpg->tpg_mutex);
1748         return 0;
1749
1750 err_session:
1751         transport_free_session(tv_nexus->tvn_se_sess);
1752 err_free:
1753         kfree(tv_nexus);
1754 err_unlock:
1755         mutex_unlock(&tpg->tpg_mutex);
1756         return ret;
1757 }
1758
1759 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1760 {
1761         struct se_session *se_sess;
1762         struct tcm_usbg_nexus *tv_nexus;
1763         int ret = -ENODEV;
1764
1765         mutex_lock(&tpg->tpg_mutex);
1766         tv_nexus = tpg->tpg_nexus;
1767         if (!tv_nexus)
1768                 goto out;
1769
1770         se_sess = tv_nexus->tvn_se_sess;
1771         if (!se_sess)
1772                 goto out;
1773
1774         if (atomic_read(&tpg->tpg_port_count)) {
1775                 ret = -EPERM;
1776                 pr_err("Unable to remove Host I_T Nexus with"
1777                                 " active TPG port count: %d\n",
1778                                 atomic_read(&tpg->tpg_port_count));
1779                 goto out;
1780         }
1781
1782         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1783                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1784         /*
1785          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1786          */
1787         transport_deregister_session(tv_nexus->tvn_se_sess);
1788         tpg->tpg_nexus = NULL;
1789
1790         kfree(tv_nexus);
1791         ret = 0;
1792 out:
1793         mutex_unlock(&tpg->tpg_mutex);
1794         return ret;
1795 }
1796
1797 static ssize_t tcm_usbg_tpg_store_nexus(
1798                 struct se_portal_group *se_tpg,
1799                 const char *page,
1800                 size_t count)
1801 {
1802         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1803         unsigned char i_port[USBG_NAMELEN], *ptr;
1804         int ret;
1805
1806         if (!strncmp(page, "NULL", 4)) {
1807                 ret = tcm_usbg_drop_nexus(tpg);
1808                 return (!ret) ? count : ret;
1809         }
1810         if (strlen(page) >= USBG_NAMELEN) {
1811                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1812                                 " max: %d\n", page, USBG_NAMELEN);
1813                 return -EINVAL;
1814         }
1815         snprintf(i_port, USBG_NAMELEN, "%s", page);
1816
1817         ptr = strstr(i_port, "naa.");
1818         if (!ptr) {
1819                 pr_err("Missing 'naa.' prefix\n");
1820                 return -EINVAL;
1821         }
1822
1823         if (i_port[strlen(i_port) - 1] == '\n')
1824                 i_port[strlen(i_port) - 1] = '\0';
1825
1826         ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1827         if (ret < 0)
1828                 return ret;
1829         return count;
1830 }
1831 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1832
1833 static struct configfs_attribute *usbg_base_attrs[] = {
1834         &tcm_usbg_tpg_enable.attr,
1835         &tcm_usbg_tpg_nexus.attr,
1836         NULL,
1837 };
1838
1839 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1840 {
1841         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1842
1843         atomic_inc(&tpg->tpg_port_count);
1844         smp_mb__after_atomic();
1845         return 0;
1846 }
1847
1848 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1849                 struct se_lun *se_lun)
1850 {
1851         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1852
1853         atomic_dec(&tpg->tpg_port_count);
1854         smp_mb__after_atomic();
1855 }
1856
1857 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1858 {
1859         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1860                         se_cmd);
1861
1862         kref_put(&cmd->ref, usbg_cmd_release);
1863         return 1;
1864 }
1865
1866 static const struct target_core_fabric_ops usbg_ops = {
1867         .module                         = THIS_MODULE,
1868         .name                           = "usb_gadget",
1869         .get_fabric_name                = usbg_get_fabric_name,
1870         .get_fabric_proto_ident         = usbg_get_fabric_proto_ident,
1871         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1872         .tpg_get_tag                    = usbg_get_tag,
1873         .tpg_get_default_depth          = usbg_get_default_depth,
1874         .tpg_get_pr_transport_id        = usbg_get_pr_transport_id,
1875         .tpg_get_pr_transport_id_len    = usbg_get_pr_transport_id_len,
1876         .tpg_parse_pr_out_transport_id  = usbg_parse_pr_out_transport_id,
1877         .tpg_check_demo_mode            = usbg_check_true,
1878         .tpg_check_demo_mode_cache      = usbg_check_false,
1879         .tpg_check_demo_mode_write_protect = usbg_check_false,
1880         .tpg_check_prod_mode_write_protect = usbg_check_false,
1881         .tpg_alloc_fabric_acl           = usbg_alloc_fabric_acl,
1882         .tpg_release_fabric_acl         = usbg_release_fabric_acl,
1883         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1884         .release_cmd                    = usbg_release_cmd,
1885         .shutdown_session               = usbg_shutdown_session,
1886         .close_session                  = usbg_close_session,
1887         .sess_get_index                 = usbg_sess_get_index,
1888         .sess_get_initiator_sid         = NULL,
1889         .write_pending                  = usbg_send_write_request,
1890         .write_pending_status           = usbg_write_pending_status,
1891         .set_default_node_attributes    = usbg_set_default_node_attrs,
1892         .get_task_tag                   = usbg_get_task_tag,
1893         .get_cmd_state                  = usbg_get_cmd_state,
1894         .queue_data_in                  = usbg_send_read_response,
1895         .queue_status                   = usbg_send_status_response,
1896         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1897         .aborted_task                   = usbg_aborted_task,
1898         .check_stop_free                = usbg_check_stop_free,
1899
1900         .fabric_make_wwn                = usbg_make_tport,
1901         .fabric_drop_wwn                = usbg_drop_tport,
1902         .fabric_make_tpg                = usbg_make_tpg,
1903         .fabric_drop_tpg                = usbg_drop_tpg,
1904         .fabric_post_link               = usbg_port_link,
1905         .fabric_pre_unlink              = usbg_port_unlink,
1906         .fabric_make_np                 = NULL,
1907         .fabric_drop_np                 = NULL,
1908         .fabric_make_nodeacl            = usbg_make_nodeacl,
1909         .fabric_drop_nodeacl            = usbg_drop_nodeacl,
1910
1911         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1912         .tfc_tpg_base_attrs             = usbg_base_attrs,
1913 };
1914
1915 /* Start gadget.c code */
1916
1917 static struct usb_interface_descriptor bot_intf_desc = {
1918         .bLength =              sizeof(bot_intf_desc),
1919         .bDescriptorType =      USB_DT_INTERFACE,
1920         .bNumEndpoints =        2,
1921         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1922         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1923         .bInterfaceSubClass =   USB_SC_SCSI,
1924         .bInterfaceProtocol =   USB_PR_BULK,
1925 };
1926
1927 static struct usb_interface_descriptor uasp_intf_desc = {
1928         .bLength =              sizeof(uasp_intf_desc),
1929         .bDescriptorType =      USB_DT_INTERFACE,
1930         .bNumEndpoints =        4,
1931         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1932         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1933         .bInterfaceSubClass =   USB_SC_SCSI,
1934         .bInterfaceProtocol =   USB_PR_UAS,
1935 };
1936
1937 static struct usb_endpoint_descriptor uasp_bi_desc = {
1938         .bLength =              USB_DT_ENDPOINT_SIZE,
1939         .bDescriptorType =      USB_DT_ENDPOINT,
1940         .bEndpointAddress =     USB_DIR_IN,
1941         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1942         .wMaxPacketSize =       cpu_to_le16(512),
1943 };
1944
1945 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1946         .bLength =              USB_DT_ENDPOINT_SIZE,
1947         .bDescriptorType =      USB_DT_ENDPOINT,
1948         .bEndpointAddress =     USB_DIR_IN,
1949         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1950 };
1951
1952 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1953         .bLength =              sizeof(uasp_bi_pipe_desc),
1954         .bDescriptorType =      USB_DT_PIPE_USAGE,
1955         .bPipeID =              DATA_IN_PIPE_ID,
1956 };
1957
1958 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1959         .bLength =              USB_DT_ENDPOINT_SIZE,
1960         .bDescriptorType =      USB_DT_ENDPOINT,
1961         .bEndpointAddress =     USB_DIR_IN,
1962         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1963         .wMaxPacketSize =       cpu_to_le16(1024),
1964 };
1965
1966 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1967         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1968         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1969         .bMaxBurst =            0,
1970         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1971         .wBytesPerInterval =    0,
1972 };
1973
1974 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1975         .bLength =              sizeof(bot_bi_ep_comp_desc),
1976         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1977         .bMaxBurst =            0,
1978 };
1979
1980 static struct usb_endpoint_descriptor uasp_bo_desc = {
1981         .bLength =              USB_DT_ENDPOINT_SIZE,
1982         .bDescriptorType =      USB_DT_ENDPOINT,
1983         .bEndpointAddress =     USB_DIR_OUT,
1984         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1985         .wMaxPacketSize =       cpu_to_le16(512),
1986 };
1987
1988 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1989         .bLength =              USB_DT_ENDPOINT_SIZE,
1990         .bDescriptorType =      USB_DT_ENDPOINT,
1991         .bEndpointAddress =     USB_DIR_OUT,
1992         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1993 };
1994
1995 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1996         .bLength =              sizeof(uasp_bo_pipe_desc),
1997         .bDescriptorType =      USB_DT_PIPE_USAGE,
1998         .bPipeID =              DATA_OUT_PIPE_ID,
1999 };
2000
2001 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2002         .bLength =              USB_DT_ENDPOINT_SIZE,
2003         .bDescriptorType =      USB_DT_ENDPOINT,
2004         .bEndpointAddress =     USB_DIR_OUT,
2005         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2006         .wMaxPacketSize =       cpu_to_le16(0x400),
2007 };
2008
2009 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2010         .bLength =              sizeof(uasp_bo_ep_comp_desc),
2011         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2012         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2013 };
2014
2015 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2016         .bLength =              sizeof(bot_bo_ep_comp_desc),
2017         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2018 };
2019
2020 static struct usb_endpoint_descriptor uasp_status_desc = {
2021         .bLength =              USB_DT_ENDPOINT_SIZE,
2022         .bDescriptorType =      USB_DT_ENDPOINT,
2023         .bEndpointAddress =     USB_DIR_IN,
2024         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2025         .wMaxPacketSize =       cpu_to_le16(512),
2026 };
2027
2028 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2029         .bLength =              USB_DT_ENDPOINT_SIZE,
2030         .bDescriptorType =      USB_DT_ENDPOINT,
2031         .bEndpointAddress =     USB_DIR_IN,
2032         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2033 };
2034
2035 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2036         .bLength =              sizeof(uasp_status_pipe_desc),
2037         .bDescriptorType =      USB_DT_PIPE_USAGE,
2038         .bPipeID =              STATUS_PIPE_ID,
2039 };
2040
2041 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2042         .bLength =              USB_DT_ENDPOINT_SIZE,
2043         .bDescriptorType =      USB_DT_ENDPOINT,
2044         .bEndpointAddress =     USB_DIR_IN,
2045         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2046         .wMaxPacketSize =       cpu_to_le16(1024),
2047 };
2048
2049 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2050         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
2051         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2052         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2053 };
2054
2055 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2056         .bLength =              USB_DT_ENDPOINT_SIZE,
2057         .bDescriptorType =      USB_DT_ENDPOINT,
2058         .bEndpointAddress =     USB_DIR_OUT,
2059         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2060         .wMaxPacketSize =       cpu_to_le16(512),
2061 };
2062
2063 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2064         .bLength =              USB_DT_ENDPOINT_SIZE,
2065         .bDescriptorType =      USB_DT_ENDPOINT,
2066         .bEndpointAddress =     USB_DIR_OUT,
2067         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2068 };
2069
2070 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2071         .bLength =              sizeof(uasp_cmd_pipe_desc),
2072         .bDescriptorType =      USB_DT_PIPE_USAGE,
2073         .bPipeID =              CMD_PIPE_ID,
2074 };
2075
2076 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2077         .bLength =              USB_DT_ENDPOINT_SIZE,
2078         .bDescriptorType =      USB_DT_ENDPOINT,
2079         .bEndpointAddress =     USB_DIR_OUT,
2080         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2081         .wMaxPacketSize =       cpu_to_le16(1024),
2082 };
2083
2084 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2085         .bLength =              sizeof(uasp_cmd_comp_desc),
2086         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2087 };
2088
2089 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2090         (struct usb_descriptor_header *) &bot_intf_desc,
2091         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2092         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2093
2094         (struct usb_descriptor_header *) &uasp_intf_desc,
2095         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2096         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2097         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2098         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2099         (struct usb_descriptor_header *) &uasp_fs_status_desc,
2100         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2101         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2102         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2103         NULL,
2104 };
2105
2106 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2107         (struct usb_descriptor_header *) &bot_intf_desc,
2108         (struct usb_descriptor_header *) &uasp_bi_desc,
2109         (struct usb_descriptor_header *) &uasp_bo_desc,
2110
2111         (struct usb_descriptor_header *) &uasp_intf_desc,
2112         (struct usb_descriptor_header *) &uasp_bi_desc,
2113         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2114         (struct usb_descriptor_header *) &uasp_bo_desc,
2115         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2116         (struct usb_descriptor_header *) &uasp_status_desc,
2117         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2118         (struct usb_descriptor_header *) &uasp_cmd_desc,
2119         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2120         NULL,
2121 };
2122
2123 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2124         (struct usb_descriptor_header *) &bot_intf_desc,
2125         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2126         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2127         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2128         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2129
2130         (struct usb_descriptor_header *) &uasp_intf_desc,
2131         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2132         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2133         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2134         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2135         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2136         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2137         (struct usb_descriptor_header *) &uasp_ss_status_desc,
2138         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2139         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2140         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2141         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2142         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2143         NULL,
2144 };
2145
2146 #define UAS_VENDOR_ID   0x0525  /* NetChip */
2147 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
2148
2149 static struct usb_device_descriptor usbg_device_desc = {
2150         .bLength =              sizeof(usbg_device_desc),
2151         .bDescriptorType =      USB_DT_DEVICE,
2152         .bcdUSB =               cpu_to_le16(0x0200),
2153         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
2154         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
2155         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
2156         .bNumConfigurations =   1,
2157 };
2158
2159 static struct usb_string        usbg_us_strings[] = {
2160         [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2161         [USB_GADGET_PRODUCT_IDX].s      = "Target Product",
2162         [USB_GADGET_SERIAL_IDX].s       = "000000000001",
2163         [USB_G_STR_CONFIG].s            = "default config",
2164         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
2165         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
2166         { },
2167 };
2168
2169 static struct usb_gadget_strings usbg_stringtab = {
2170         .language = 0x0409,
2171         .strings = usbg_us_strings,
2172 };
2173
2174 static struct usb_gadget_strings *usbg_strings[] = {
2175         &usbg_stringtab,
2176         NULL,
2177 };
2178
2179 static int guas_unbind(struct usb_composite_dev *cdev)
2180 {
2181         return 0;
2182 }
2183
2184 static struct usb_configuration usbg_config_driver = {
2185         .label                  = "Linux Target",
2186         .bConfigurationValue    = 1,
2187         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2188 };
2189
2190 static void give_back_ep(struct usb_ep **pep)
2191 {
2192         struct usb_ep *ep = *pep;
2193         if (!ep)
2194                 return;
2195         ep->driver_data = NULL;
2196 }
2197
2198 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2199 {
2200         struct f_uas            *fu = to_f_uas(f);
2201         struct usb_gadget       *gadget = c->cdev->gadget;
2202         struct usb_ep           *ep;
2203         int                     iface;
2204         int                     ret;
2205
2206         iface = usb_interface_id(c, f);
2207         if (iface < 0)
2208                 return iface;
2209
2210         bot_intf_desc.bInterfaceNumber = iface;
2211         uasp_intf_desc.bInterfaceNumber = iface;
2212         fu->iface = iface;
2213         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2214                         &uasp_bi_ep_comp_desc);
2215         if (!ep)
2216                 goto ep_fail;
2217
2218         ep->driver_data = fu;
2219         fu->ep_in = ep;
2220
2221         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2222                         &uasp_bo_ep_comp_desc);
2223         if (!ep)
2224                 goto ep_fail;
2225         ep->driver_data = fu;
2226         fu->ep_out = ep;
2227
2228         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2229                         &uasp_status_in_ep_comp_desc);
2230         if (!ep)
2231                 goto ep_fail;
2232         ep->driver_data = fu;
2233         fu->ep_status = ep;
2234
2235         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2236                         &uasp_cmd_comp_desc);
2237         if (!ep)
2238                 goto ep_fail;
2239         ep->driver_data = fu;
2240         fu->ep_cmd = ep;
2241
2242         /* Assume endpoint addresses are the same for both speeds */
2243         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2244         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2245         uasp_status_desc.bEndpointAddress =
2246                 uasp_ss_status_desc.bEndpointAddress;
2247         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2248
2249         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2250         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2251         uasp_fs_status_desc.bEndpointAddress =
2252                 uasp_ss_status_desc.bEndpointAddress;
2253         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2254
2255         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2256                         uasp_hs_function_desc, uasp_ss_function_desc);
2257         if (ret)
2258                 goto ep_fail;
2259
2260         return 0;
2261 ep_fail:
2262         pr_err("Can't claim all required eps\n");
2263
2264         give_back_ep(&fu->ep_in);
2265         give_back_ep(&fu->ep_out);
2266         give_back_ep(&fu->ep_status);
2267         give_back_ep(&fu->ep_cmd);
2268         return -ENOTSUPP;
2269 }
2270
2271 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2272 {
2273         struct f_uas *fu = to_f_uas(f);
2274
2275         usb_free_all_descriptors(f);
2276         kfree(fu);
2277 }
2278
2279 struct guas_setup_wq {
2280         struct work_struct work;
2281         struct f_uas *fu;
2282         unsigned int alt;
2283 };
2284
2285 static void usbg_delayed_set_alt(struct work_struct *wq)
2286 {
2287         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2288                         work);
2289         struct f_uas *fu = work->fu;
2290         int alt = work->alt;
2291
2292         kfree(work);
2293
2294         if (fu->flags & USBG_IS_BOT)
2295                 bot_cleanup_old_alt(fu);
2296         if (fu->flags & USBG_IS_UAS)
2297                 uasp_cleanup_old_alt(fu);
2298
2299         if (alt == USB_G_ALT_INT_BBB)
2300                 bot_set_alt(fu);
2301         else if (alt == USB_G_ALT_INT_UAS)
2302                 uasp_set_alt(fu);
2303         usb_composite_setup_continue(fu->function.config->cdev);
2304 }
2305
2306 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2307 {
2308         struct f_uas *fu = to_f_uas(f);
2309
2310         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2311                 struct guas_setup_wq *work;
2312
2313                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2314                 if (!work)
2315                         return -ENOMEM;
2316                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2317                 work->fu = fu;
2318                 work->alt = alt;
2319                 schedule_work(&work->work);
2320                 return USB_GADGET_DELAYED_STATUS;
2321         }
2322         return -EOPNOTSUPP;
2323 }
2324
2325 static void usbg_disable(struct usb_function *f)
2326 {
2327         struct f_uas *fu = to_f_uas(f);
2328
2329         if (fu->flags & USBG_IS_UAS)
2330                 uasp_cleanup_old_alt(fu);
2331         else if (fu->flags & USBG_IS_BOT)
2332                 bot_cleanup_old_alt(fu);
2333         fu->flags = 0;
2334 }
2335
2336 static int usbg_setup(struct usb_function *f,
2337                 const struct usb_ctrlrequest *ctrl)
2338 {
2339         struct f_uas *fu = to_f_uas(f);
2340
2341         if (!(fu->flags & USBG_IS_BOT))
2342                 return -EOPNOTSUPP;
2343
2344         return usbg_bot_setup(f, ctrl);
2345 }
2346
2347 static int usbg_cfg_bind(struct usb_configuration *c)
2348 {
2349         struct f_uas *fu;
2350         int ret;
2351
2352         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2353         if (!fu)
2354                 return -ENOMEM;
2355         fu->function.name = "Target Function";
2356         fu->function.bind = usbg_bind;
2357         fu->function.unbind = usbg_unbind;
2358         fu->function.set_alt = usbg_set_alt;
2359         fu->function.setup = usbg_setup;
2360         fu->function.disable = usbg_disable;
2361         fu->tpg = the_only_tpg_I_currently_have;
2362
2363         bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2364         uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2365
2366         ret = usb_add_function(c, &fu->function);
2367         if (ret)
2368                 goto err;
2369
2370         return 0;
2371 err:
2372         kfree(fu);
2373         return ret;
2374 }
2375
2376 static int usb_target_bind(struct usb_composite_dev *cdev)
2377 {
2378         int ret;
2379
2380         ret = usb_string_ids_tab(cdev, usbg_us_strings);
2381         if (ret)
2382                 return ret;
2383
2384         usbg_device_desc.iManufacturer =
2385                 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2386         usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2387         usbg_device_desc.iSerialNumber =
2388                 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2389         usbg_config_driver.iConfiguration =
2390                 usbg_us_strings[USB_G_STR_CONFIG].id;
2391
2392         ret = usb_add_config(cdev, &usbg_config_driver,
2393                         usbg_cfg_bind);
2394         if (ret)
2395                 return ret;
2396         usb_composite_overwrite_options(cdev, &coverwrite);
2397         return 0;
2398 }
2399
2400 static struct usb_composite_driver usbg_driver = {
2401         .name           = "g_target",
2402         .dev            = &usbg_device_desc,
2403         .strings        = usbg_strings,
2404         .max_speed      = USB_SPEED_SUPER,
2405         .bind           = usb_target_bind,
2406         .unbind         = guas_unbind,
2407 };
2408
2409 static int usbg_attach(struct usbg_tpg *tpg)
2410 {
2411         return usb_composite_probe(&usbg_driver);
2412 }
2413
2414 static void usbg_detach(struct usbg_tpg *tpg)
2415 {
2416         usb_composite_unregister(&usbg_driver);
2417 }
2418
2419 static int __init usb_target_gadget_init(void)
2420 {
2421         return target_register_template(&usbg_ops);
2422 }
2423 module_init(usb_target_gadget_init);
2424
2425 static void __exit usb_target_gadget_exit(void)
2426 {
2427         target_unregister_template(&usbg_ops);
2428 }
2429 module_exit(usb_target_gadget_exit);
2430
2431 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2432 MODULE_DESCRIPTION("usb-gadget fabric");
2433 MODULE_LICENSE("GPL v2");