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_tcq.h>
  20 #include <target/target_core_base.h>
  21 #include <target/target_core_fabric.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "tcm_usb_gadget.h"
  25
  26 USB_GADGET_COMPOSITE_OPTIONS();
  27
  28 static inline struct f_uas *to_f_uas(struct usb_function *f)
  29 {
  30         return container_of(f, struct f_uas, function);
  31 }
  32
  33 static void usbg_cmd_release(struct kref *);
  34
  35 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
  36 {
  37         kref_put(&cmd->ref, usbg_cmd_release);
  38 }
  39
  40 /* Start bot.c code */
  41
  42 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
  43 {
  44         int ret;
  45
  46         if (fu->flags & USBG_BOT_CMD_PEND)
  47                 return 0;
  48
  49         ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
  50         if (!ret)
  51                 fu->flags |= USBG_BOT_CMD_PEND;
  52         return ret;
  53 }
  54
  55 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
  56 {
  57         struct usbg_cmd *cmd = req->context;
  58         struct f_uas *fu = cmd->fu;
  59
  60         usbg_cleanup_cmd(cmd);
  61         if (req->status < 0) {
  62                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
  63                 return;
  64         }
  65
  66         /* CSW completed, wait for next CBW */
  67         bot_enqueue_cmd_cbw(fu);
  68 }
  69
  70 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
  71 {
  72         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
  73         int ret;
  74         u8 *sense;
  75         unsigned int csw_stat;
  76
  77         csw_stat = cmd->csw_code;
  78
  79         /*
  80          * We can't send SENSE as a response. So we take ASC & ASCQ from our
  81          * sense buffer and queue it and hope the host sends a REQUEST_SENSE
  82          * command where it learns why we failed.
  83          */
  84         sense = cmd->sense_iu.sense;
  85
  86         csw->Tag = cmd->bot_tag;
  87         csw->Status = csw_stat;
  88         fu->bot_status.req->context = cmd;
  89         ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
  90         if (ret)
  91                 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
  92 }
  93
  94 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
  95 {
  96         struct usbg_cmd *cmd = req->context;
  97         struct f_uas *fu = cmd->fu;
  98
  99         if (req->status < 0)
 100                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 101
 102         if (cmd->data_len) {
 103                 if (cmd->data_len > ep->maxpacket) {
 104                         req->length = ep->maxpacket;
 105                         cmd->data_len -= ep->maxpacket;
 106                 } else {
 107                         req->length = cmd->data_len;
 108                         cmd->data_len = 0;
 109                 }
 110
 111                 usb_ep_queue(ep, req, GFP_ATOMIC);
 112                 return ;
 113         }
 114         bot_enqueue_sense_code(fu, cmd);
 115 }
 116
 117 static void bot_send_bad_status(struct usbg_cmd *cmd)
 118 {
 119         struct f_uas *fu = cmd->fu;
 120         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 121         struct usb_request *req;
 122         struct usb_ep *ep;
 123
 124         csw->Residue = cpu_to_le32(cmd->data_len);
 125
 126         if (cmd->data_len) {
 127                 if (cmd->is_read) {
 128                         ep = fu->ep_in;
 129                         req = fu->bot_req_in;
 130                 } else {
 131                         ep = fu->ep_out;
 132                         req = fu->bot_req_out;
 133                 }
 134
 135                 if (cmd->data_len > fu->ep_in->maxpacket) {
 136                         req->length = ep->maxpacket;
 137                         cmd->data_len -= ep->maxpacket;
 138                 } else {
 139                         req->length = cmd->data_len;
 140                         cmd->data_len = 0;
 141                 }
 142                 req->complete = bot_err_compl;
 143                 req->context = cmd;
 144                 req->buf = fu->cmd.buf;
 145                 usb_ep_queue(ep, req, GFP_KERNEL);
 146         } else {
 147                 bot_enqueue_sense_code(fu, cmd);
 148         }
 149 }
 150
 151 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
 152 {
 153         struct f_uas *fu = cmd->fu;
 154         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 155         int ret;
 156
 157         if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
 158                 if (!moved_data && cmd->data_len) {
 159                         /*
 160                          * the host wants to move data, we don't. Fill / empty
 161                          * the pipe and then send the csw with reside set.
 162                          */
 163                         cmd->csw_code = US_BULK_STAT_OK;
 164                         bot_send_bad_status(cmd);
 165                         return 0;
 166                 }
 167
 168                 csw->Tag = cmd->bot_tag;
 169                 csw->Residue = cpu_to_le32(0);
 170                 csw->Status = US_BULK_STAT_OK;
 171                 fu->bot_status.req->context = cmd;
 172
 173                 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
 174                 if (ret)
 175                         pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
 176         } else {
 177                 cmd->csw_code = US_BULK_STAT_FAIL;
 178                 bot_send_bad_status(cmd);
 179         }
 180         return 0;
 181 }
 182
 183 /*
 184  * Called after command (no data transfer) or after the write (to device)
 185  * operation is completed
 186  */
 187 static int bot_send_status_response(struct usbg_cmd *cmd)
 188 {
 189         bool moved_data = false;
 190
 191         if (!cmd->is_read)
 192                 moved_data = true;
 193         return bot_send_status(cmd, moved_data);
 194 }
 195
 196 /* Read request completed, now we have to send the CSW */
 197 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
 198 {
 199         struct usbg_cmd *cmd = req->context;
 200
 201         if (req->status < 0)
 202                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 203
 204         bot_send_status(cmd, true);
 205 }
 206
 207 static int bot_send_read_response(struct usbg_cmd *cmd)
 208 {
 209         struct f_uas *fu = cmd->fu;
 210         struct se_cmd *se_cmd = &cmd->se_cmd;
 211         struct usb_gadget *gadget = fuas_to_gadget(fu);
 212         int ret;
 213
 214         if (!cmd->data_len) {
 215                 cmd->csw_code = US_BULK_STAT_PHASE;
 216                 bot_send_bad_status(cmd);
 217                 return 0;
 218         }
 219
 220         if (!gadget->sg_supported) {
 221                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 222                 if (!cmd->data_buf)
 223                         return -ENOMEM;
 224
 225                 sg_copy_to_buffer(se_cmd->t_data_sg,
 226                                 se_cmd->t_data_nents,
 227                                 cmd->data_buf,
 228                                 se_cmd->data_length);
 229
 230                 fu->bot_req_in->buf = cmd->data_buf;
 231         } else {
 232                 fu->bot_req_in->buf = NULL;
 233                 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
 234                 fu->bot_req_in->sg = se_cmd->t_data_sg;
 235         }
 236
 237         fu->bot_req_in->complete = bot_read_compl;
 238         fu->bot_req_in->length = se_cmd->data_length;
 239         fu->bot_req_in->context = cmd;
 240         ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
 241         if (ret)
 242                 pr_err("%s(%d)\n", __func__, __LINE__);
 243         return 0;
 244 }
 245
 246 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
 247 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
 248
 249 static int bot_send_write_request(struct usbg_cmd *cmd)
 250 {
 251         struct f_uas *fu = cmd->fu;
 252         struct se_cmd *se_cmd = &cmd->se_cmd;
 253         struct usb_gadget *gadget = fuas_to_gadget(fu);
 254         int ret;
 255
 256         init_completion(&cmd->write_complete);
 257         cmd->fu = fu;
 258
 259         if (!cmd->data_len) {
 260                 cmd->csw_code = US_BULK_STAT_PHASE;
 261                 return -EINVAL;
 262         }
 263
 264         if (!gadget->sg_supported) {
 265                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
 266                 if (!cmd->data_buf)
 267                         return -ENOMEM;
 268
 269                 fu->bot_req_out->buf = cmd->data_buf;
 270         } else {
 271                 fu->bot_req_out->buf = NULL;
 272                 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
 273                 fu->bot_req_out->sg = se_cmd->t_data_sg;
 274         }
 275
 276         fu->bot_req_out->complete = usbg_data_write_cmpl;
 277         fu->bot_req_out->length = se_cmd->data_length;
 278         fu->bot_req_out->context = cmd;
 279
 280         ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
 281         if (ret)
 282                 goto cleanup;
 283         ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
 284         if (ret)
 285                 pr_err("%s(%d)\n", __func__, __LINE__);
 286
 287         wait_for_completion(&cmd->write_complete);
 288         target_execute_cmd(se_cmd);
 289 cleanup:
 290         return ret;
 291 }
 292
 293 static int bot_submit_command(struct f_uas *, void *, unsigned int);
 294
 295 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 296 {
 297         struct f_uas *fu = req->context;
 298         int ret;
 299
 300         fu->flags &= ~USBG_BOT_CMD_PEND;
 301
 302         if (req->status < 0)
 303                 return;
 304
 305         ret = bot_submit_command(fu, req->buf, req->actual);
 306         if (ret)
 307                 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
 308 }
 309
 310 static int bot_prepare_reqs(struct f_uas *fu)
 311 {
 312         int ret;
 313
 314         fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 315         if (!fu->bot_req_in)
 316                 goto err;
 317
 318         fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 319         if (!fu->bot_req_out)
 320                 goto err_out;
 321
 322         fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 323         if (!fu->cmd.req)
 324                 goto err_cmd;
 325
 326         fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 327         if (!fu->bot_status.req)
 328                 goto err_sts;
 329
 330         fu->bot_status.req->buf = &fu->bot_status.csw;
 331         fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
 332         fu->bot_status.req->complete = bot_status_complete;
 333         fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
 334
 335         fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
 336         if (!fu->cmd.buf)
 337                 goto err_buf;
 338
 339         fu->cmd.req->complete = bot_cmd_complete;
 340         fu->cmd.req->buf = fu->cmd.buf;
 341         fu->cmd.req->length = fu->ep_out->maxpacket;
 342         fu->cmd.req->context = fu;
 343
 344         ret = bot_enqueue_cmd_cbw(fu);
 345         if (ret)
 346                 goto err_queue;
 347         return 0;
 348 err_queue:
 349         kfree(fu->cmd.buf);
 350         fu->cmd.buf = NULL;
 351 err_buf:
 352         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
 353 err_sts:
 354         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 355         fu->cmd.req = NULL;
 356 err_cmd:
 357         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 358         fu->bot_req_out = NULL;
 359 err_out:
 360         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 361         fu->bot_req_in = NULL;
 362 err:
 363         pr_err("BOT: endpoint setup failed\n");
 364         return -ENOMEM;
 365 }
 366
 367 static void bot_cleanup_old_alt(struct f_uas *fu)
 368 {
 369         if (!(fu->flags & USBG_ENABLED))
 370                 return;
 371
 372         usb_ep_disable(fu->ep_in);
 373         usb_ep_disable(fu->ep_out);
 374
 375         if (!fu->bot_req_in)
 376                 return;
 377
 378         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 379         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 380         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 381         usb_ep_free_request(fu->ep_out, fu->bot_status.req);
 382
 383         kfree(fu->cmd.buf);
 384
 385         fu->bot_req_in = NULL;
 386         fu->bot_req_out = NULL;
 387         fu->cmd.req = NULL;
 388         fu->bot_status.req = NULL;
 389         fu->cmd.buf = NULL;
 390 }
 391
 392 static void bot_set_alt(struct f_uas *fu)
 393 {
 394         struct usb_function *f = &fu->function;
 395         struct usb_gadget *gadget = f->config->cdev->gadget;
 396         int ret;
 397
 398         fu->flags = USBG_IS_BOT;
 399
 400         config_ep_by_speed(gadget, f, fu->ep_in);
 401         ret = usb_ep_enable(fu->ep_in);
 402         if (ret)
 403                 goto err_b_in;
 404
 405         config_ep_by_speed(gadget, f, fu->ep_out);
 406         ret = usb_ep_enable(fu->ep_out);
 407         if (ret)
 408                 goto err_b_out;
 409
 410         ret = bot_prepare_reqs(fu);
 411         if (ret)
 412                 goto err_wq;
 413         fu->flags |= USBG_ENABLED;
 414         pr_info("Using the BOT protocol\n");
 415         return;
 416 err_wq:
 417         usb_ep_disable(fu->ep_out);
 418 err_b_out:
 419         usb_ep_disable(fu->ep_in);
 420 err_b_in:
 421         fu->flags = USBG_IS_BOT;
 422 }
 423
 424 static int usbg_bot_setup(struct usb_function *f,
 425                 const struct usb_ctrlrequest *ctrl)
 426 {
 427         struct f_uas *fu = to_f_uas(f);
 428         struct usb_composite_dev *cdev = f->config->cdev;
 429         u16 w_value = le16_to_cpu(ctrl->wValue);
 430         u16 w_length = le16_to_cpu(ctrl->wLength);
 431         int luns;
 432         u8 *ret_lun;
 433
 434         switch (ctrl->bRequest) {
 435         case US_BULK_GET_MAX_LUN:
 436                 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
 437                                         USB_RECIP_INTERFACE))
 438                         return -ENOTSUPP;
 439
 440                 if (w_length < 1)
 441                         return -EINVAL;
 442                 if (w_value != 0)
 443                         return -EINVAL;
 444                 luns = atomic_read(&fu->tpg->tpg_port_count);
 445                 if (!luns) {
 446                         pr_err("No LUNs configured?\n");
 447                         return -EINVAL;
 448                 }
 449                 /*
 450                  * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
 451                  * accessed. The upper limit is 0xf
 452                  */
 453                 luns--;
 454                 if (luns > 0xf) {
 455                         pr_info_once("Limiting the number of luns to 16\n");
 456                         luns = 0xf;
 457                 }
 458                 ret_lun = cdev->req->buf;
 459                 *ret_lun = luns;
 460                 cdev->req->length = 1;
 461                 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
 462                 break;
 463
 464         case US_BULK_RESET_REQUEST:
 465                 /* XXX maybe we should remove previous requests for IN + OUT */
 466                 bot_enqueue_cmd_cbw(fu);
 467                 return 0;
 468                 break;
 469         }
 470         return -ENOTSUPP;
 471 }
 472
 473 /* Start uas.c code */
 474
 475 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
 476 {
 477         /* We have either all three allocated or none */
 478         if (!stream->req_in)
 479                 return;
 480
 481         usb_ep_free_request(fu->ep_in, stream->req_in);
 482         usb_ep_free_request(fu->ep_out, stream->req_out);
 483         usb_ep_free_request(fu->ep_status, stream->req_status);
 484
 485         stream->req_in = NULL;
 486         stream->req_out = NULL;
 487         stream->req_status = NULL;
 488 }
 489
 490 static void uasp_free_cmdreq(struct f_uas *fu)
 491 {
 492         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 493         kfree(fu->cmd.buf);
 494         fu->cmd.req = NULL;
 495         fu->cmd.buf = NULL;
 496 }
 497
 498 static void uasp_cleanup_old_alt(struct f_uas *fu)
 499 {
 500         int i;
 501
 502         if (!(fu->flags & USBG_ENABLED))
 503                 return;
 504
 505         usb_ep_disable(fu->ep_in);
 506         usb_ep_disable(fu->ep_out);
 507         usb_ep_disable(fu->ep_status);
 508         usb_ep_disable(fu->ep_cmd);
 509
 510         for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
 511                 uasp_cleanup_one_stream(fu, &fu->stream[i]);
 512         uasp_free_cmdreq(fu);
 513 }
 514
 515 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
 516
 517 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
 518 {
 519         struct se_cmd *se_cmd = &cmd->se_cmd;
 520         struct f_uas *fu = cmd->fu;
 521         struct usb_gadget *gadget = fuas_to_gadget(fu);
 522         struct uas_stream *stream = cmd->stream;
 523
 524         if (!gadget->sg_supported) {
 525                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 526                 if (!cmd->data_buf)
 527                         return -ENOMEM;
 528
 529                 sg_copy_to_buffer(se_cmd->t_data_sg,
 530                                 se_cmd->t_data_nents,
 531                                 cmd->data_buf,
 532                                 se_cmd->data_length);
 533
 534                 stream->req_in->buf = cmd->data_buf;
 535         } else {
 536                 stream->req_in->buf = NULL;
 537                 stream->req_in->num_sgs = se_cmd->t_data_nents;
 538                 stream->req_in->sg = se_cmd->t_data_sg;
 539         }
 540
 541         stream->req_in->complete = uasp_status_data_cmpl;
 542         stream->req_in->length = se_cmd->data_length;
 543         stream->req_in->context = cmd;
 544
 545         cmd->state = UASP_SEND_STATUS;
 546         return 0;
 547 }
 548
 549 static void uasp_prepare_status(struct usbg_cmd *cmd)
 550 {
 551         struct se_cmd *se_cmd = &cmd->se_cmd;
 552         struct sense_iu *iu = &cmd->sense_iu;
 553         struct uas_stream *stream = cmd->stream;
 554
 555         cmd->state = UASP_QUEUE_COMMAND;
 556         iu->iu_id = IU_ID_STATUS;
 557         iu->tag = cpu_to_be16(cmd->tag);
 558
 559         /*
 560          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
 561          */
 562         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
 563         iu->status = se_cmd->scsi_status;
 564         stream->req_status->context = cmd;
 565         stream->req_status->length = se_cmd->scsi_sense_length + 16;
 566         stream->req_status->buf = iu;
 567         stream->req_status->complete = uasp_status_data_cmpl;
 568 }
 569
 570 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
 571 {
 572         struct usbg_cmd *cmd = req->context;
 573         struct uas_stream *stream = cmd->stream;
 574         struct f_uas *fu = cmd->fu;
 575         int ret;
 576
 577         if (req->status < 0)
 578                 goto cleanup;
 579
 580         switch (cmd->state) {
 581         case UASP_SEND_DATA:
 582                 ret = uasp_prepare_r_request(cmd);
 583                 if (ret)
 584                         goto cleanup;
 585                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 586                 if (ret)
 587                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 588                 break;
 589
 590         case UASP_RECEIVE_DATA:
 591                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 592                 if (ret)
 593                         goto cleanup;
 594                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 595                 if (ret)
 596                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 597                 break;
 598
 599         case UASP_SEND_STATUS:
 600                 uasp_prepare_status(cmd);
 601                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 602                                 GFP_ATOMIC);
 603                 if (ret)
 604                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 605                 break;
 606
 607         case UASP_QUEUE_COMMAND:
 608                 usbg_cleanup_cmd(cmd);
 609                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 610                 break;
 611
 612         default:
 613                 BUG();
 614         }
 615         return;
 616
 617 cleanup:
 618         usbg_cleanup_cmd(cmd);
 619 }
 620
 621 static int uasp_send_status_response(struct usbg_cmd *cmd)
 622 {
 623         struct f_uas *fu = cmd->fu;
 624         struct uas_stream *stream = cmd->stream;
 625         struct sense_iu *iu = &cmd->sense_iu;
 626
 627         iu->tag = cpu_to_be16(cmd->tag);
 628         stream->req_status->complete = uasp_status_data_cmpl;
 629         stream->req_status->context = cmd;
 630         cmd->fu = fu;
 631         uasp_prepare_status(cmd);
 632         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
 633 }
 634
 635 static int uasp_send_read_response(struct usbg_cmd *cmd)
 636 {
 637         struct f_uas *fu = cmd->fu;
 638         struct uas_stream *stream = cmd->stream;
 639         struct sense_iu *iu = &cmd->sense_iu;
 640         int ret;
 641
 642         cmd->fu = fu;
 643
 644         iu->tag = cpu_to_be16(cmd->tag);
 645         if (fu->flags & USBG_USE_STREAMS) {
 646
 647                 ret = uasp_prepare_r_request(cmd);
 648                 if (ret)
 649                         goto out;
 650                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 651                 if (ret) {
 652                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 653                         kfree(cmd->data_buf);
 654                         cmd->data_buf = NULL;
 655                 }
 656
 657         } else {
 658
 659                 iu->iu_id = IU_ID_READ_READY;
 660                 iu->tag = cpu_to_be16(cmd->tag);
 661
 662                 stream->req_status->complete = uasp_status_data_cmpl;
 663                 stream->req_status->context = cmd;
 664
 665                 cmd->state = UASP_SEND_DATA;
 666                 stream->req_status->buf = iu;
 667                 stream->req_status->length = sizeof(struct iu);
 668
 669                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 670                                 GFP_ATOMIC);
 671                 if (ret)
 672                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 673         }
 674 out:
 675         return ret;
 676 }
 677
 678 static int uasp_send_write_request(struct usbg_cmd *cmd)
 679 {
 680         struct f_uas *fu = cmd->fu;
 681         struct se_cmd *se_cmd = &cmd->se_cmd;
 682         struct uas_stream *stream = cmd->stream;
 683         struct sense_iu *iu = &cmd->sense_iu;
 684         int ret;
 685
 686         init_completion(&cmd->write_complete);
 687         cmd->fu = fu;
 688
 689         iu->tag = cpu_to_be16(cmd->tag);
 690
 691         if (fu->flags & USBG_USE_STREAMS) {
 692
 693                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 694                 if (ret)
 695                         goto cleanup;
 696                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 697                 if (ret)
 698                         pr_err("%s(%d)\n", __func__, __LINE__);
 699
 700         } else {
 701
 702                 iu->iu_id = IU_ID_WRITE_READY;
 703                 iu->tag = cpu_to_be16(cmd->tag);
 704
 705                 stream->req_status->complete = uasp_status_data_cmpl;
 706                 stream->req_status->context = cmd;
 707
 708                 cmd->state = UASP_RECEIVE_DATA;
 709                 stream->req_status->buf = iu;
 710                 stream->req_status->length = sizeof(struct iu);
 711
 712                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 713                                 GFP_ATOMIC);
 714                 if (ret)
 715                         pr_err("%s(%d)\n", __func__, __LINE__);
 716         }
 717
 718         wait_for_completion(&cmd->write_complete);
 719         target_execute_cmd(se_cmd);
 720 cleanup:
 721         return ret;
 722 }
 723
 724 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
 725
 726 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 727 {
 728         struct f_uas *fu = req->context;
 729         int ret;
 730
 731         if (req->status < 0)
 732                 return;
 733
 734         ret = usbg_submit_command(fu, req->buf, req->actual);
 735         /*
 736          * Once we tune for performance enqueue the command req here again so
 737          * we can receive a second command while we processing this one. Pay
 738          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
 739          * don't break HS.
 740          */
 741         if (!ret)
 742                 return;
 743         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 744 }
 745
 746 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
 747 {
 748         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 749         if (!stream->req_in)
 750                 goto out;
 751
 752         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 753         if (!stream->req_out)
 754                 goto err_out;
 755
 756         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
 757         if (!stream->req_status)
 758                 goto err_sts;
 759
 760         return 0;
 761 err_sts:
 762         usb_ep_free_request(fu->ep_status, stream->req_status);
 763         stream->req_status = NULL;
 764 err_out:
 765         usb_ep_free_request(fu->ep_out, stream->req_out);
 766         stream->req_out = NULL;
 767 out:
 768         return -ENOMEM;
 769 }
 770
 771 static int uasp_alloc_cmd(struct f_uas *fu)
 772 {
 773         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 774         if (!fu->cmd.req)
 775                 goto err;
 776
 777         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 778         if (!fu->cmd.buf)
 779                 goto err_buf;
 780
 781         fu->cmd.req->complete = uasp_cmd_complete;
 782         fu->cmd.req->buf = fu->cmd.buf;
 783         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 784         fu->cmd.req->context = fu;
 785         return 0;
 786
 787 err_buf:
 788         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 789 err:
 790         return -ENOMEM;
 791 }
 792
 793 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 794 {
 795         int i;
 796
 797         for (i = 0; i < max_streams; i++) {
 798                 struct uas_stream *s = &fu->stream[i];
 799
 800                 s->req_in->stream_id = i + 1;
 801                 s->req_out->stream_id = i + 1;
 802                 s->req_status->stream_id = i + 1;
 803         }
 804 }
 805
 806 static int uasp_prepare_reqs(struct f_uas *fu)
 807 {
 808         int ret;
 809         int i;
 810         int max_streams;
 811
 812         if (fu->flags & USBG_USE_STREAMS)
 813                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 814         else
 815                 max_streams = 1;
 816
 817         for (i = 0; i < max_streams; i++) {
 818                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 819                 if (ret)
 820                         goto err_cleanup;
 821         }
 822
 823         ret = uasp_alloc_cmd(fu);
 824         if (ret)
 825                 goto err_free_stream;
 826         uasp_setup_stream_res(fu, max_streams);
 827
 828         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 829         if (ret)
 830                 goto err_free_stream;
 831
 832         return 0;
 833
 834 err_free_stream:
 835         uasp_free_cmdreq(fu);
 836
 837 err_cleanup:
 838         if (i) {
 839                 do {
 840                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 841                         i--;
 842                 } while (i);
 843         }
 844         pr_err("UASP: endpoint setup failed\n");
 845         return ret;
 846 }
 847
 848 static void uasp_set_alt(struct f_uas *fu)
 849 {
 850         struct usb_function *f = &fu->function;
 851         struct usb_gadget *gadget = f->config->cdev->gadget;
 852         int ret;
 853
 854         fu->flags = USBG_IS_UAS;
 855
 856         if (gadget->speed == USB_SPEED_SUPER)
 857                 fu->flags |= USBG_USE_STREAMS;
 858
 859         config_ep_by_speed(gadget, f, fu->ep_in);
 860         ret = usb_ep_enable(fu->ep_in);
 861         if (ret)
 862                 goto err_b_in;
 863
 864         config_ep_by_speed(gadget, f, fu->ep_out);
 865         ret = usb_ep_enable(fu->ep_out);
 866         if (ret)
 867                 goto err_b_out;
 868
 869         config_ep_by_speed(gadget, f, fu->ep_cmd);
 870         ret = usb_ep_enable(fu->ep_cmd);
 871         if (ret)
 872                 goto err_cmd;
 873         config_ep_by_speed(gadget, f, fu->ep_status);
 874         ret = usb_ep_enable(fu->ep_status);
 875         if (ret)
 876                 goto err_status;
 877
 878         ret = uasp_prepare_reqs(fu);
 879         if (ret)
 880                 goto err_wq;
 881         fu->flags |= USBG_ENABLED;
 882
 883         pr_info("Using the UAS protocol\n");
 884         return;
 885 err_wq:
 886         usb_ep_disable(fu->ep_status);
 887 err_status:
 888         usb_ep_disable(fu->ep_cmd);
 889 err_cmd:
 890         usb_ep_disable(fu->ep_out);
 891 err_b_out:
 892         usb_ep_disable(fu->ep_in);
 893 err_b_in:
 894         fu->flags = 0;
 895 }
 896
 897 static int get_cmd_dir(const unsigned char *cdb)
 898 {
 899         int ret;
 900
 901         switch (cdb[0]) {
 902         case READ_6:
 903         case READ_10:
 904         case READ_12:
 905         case READ_16:
 906         case INQUIRY:
 907         case MODE_SENSE:
 908         case MODE_SENSE_10:
 909         case SERVICE_ACTION_IN_16:
 910         case MAINTENANCE_IN:
 911         case PERSISTENT_RESERVE_IN:
 912         case SECURITY_PROTOCOL_IN:
 913         case ACCESS_CONTROL_IN:
 914         case REPORT_LUNS:
 915         case READ_BLOCK_LIMITS:
 916         case READ_POSITION:
 917         case READ_CAPACITY:
 918         case READ_TOC:
 919         case READ_FORMAT_CAPACITIES:
 920         case REQUEST_SENSE:
 921                 ret = DMA_FROM_DEVICE;
 922                 break;
 923
 924         case WRITE_6:
 925         case WRITE_10:
 926         case WRITE_12:
 927         case WRITE_16:
 928         case MODE_SELECT:
 929         case MODE_SELECT_10:
 930         case WRITE_VERIFY:
 931         case WRITE_VERIFY_12:
 932         case PERSISTENT_RESERVE_OUT:
 933         case MAINTENANCE_OUT:
 934         case SECURITY_PROTOCOL_OUT:
 935         case ACCESS_CONTROL_OUT:
 936                 ret = DMA_TO_DEVICE;
 937                 break;
 938         case ALLOW_MEDIUM_REMOVAL:
 939         case TEST_UNIT_READY:
 940         case SYNCHRONIZE_CACHE:
 941         case START_STOP:
 942         case ERASE:
 943         case REZERO_UNIT:
 944         case SEEK_10:
 945         case SPACE:
 946         case VERIFY:
 947         case WRITE_FILEMARKS:
 948                 ret = DMA_NONE;
 949                 break;
 950         default:
 951                 pr_warn("target: Unknown data direction for SCSI Opcode "
 952                                 "0x%02x\n", cdb[0]);
 953                 ret = -EINVAL;
 954         }
 955         return ret;
 956 }
 957
 958 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 959 {
 960         struct usbg_cmd *cmd = req->context;
 961         struct se_cmd *se_cmd = &cmd->se_cmd;
 962
 963         if (req->status < 0) {
 964                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 965                 goto cleanup;
 966         }
 967
 968         if (req->num_sgs == 0) {
 969                 sg_copy_from_buffer(se_cmd->t_data_sg,
 970                                 se_cmd->t_data_nents,
 971                                 cmd->data_buf,
 972                                 se_cmd->data_length);
 973         }
 974
 975         complete(&cmd->write_complete);
 976         return;
 977
 978 cleanup:
 979         usbg_cleanup_cmd(cmd);
 980 }
 981
 982 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 983 {
 984         struct se_cmd *se_cmd = &cmd->se_cmd;
 985         struct f_uas *fu = cmd->fu;
 986         struct usb_gadget *gadget = fuas_to_gadget(fu);
 987
 988         if (!gadget->sg_supported) {
 989                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 990                 if (!cmd->data_buf)
 991                         return -ENOMEM;
 992
 993                 req->buf = cmd->data_buf;
 994         } else {
 995                 req->buf = NULL;
 996                 req->num_sgs = se_cmd->t_data_nents;
 997                 req->sg = se_cmd->t_data_sg;
 998         }
 999
1000         req->complete = usbg_data_write_cmpl;
1001         req->length = se_cmd->data_length;
1002         req->context = cmd;
1003         return 0;
1004 }
1005
1006 static int usbg_send_status_response(struct se_cmd *se_cmd)
1007 {
1008         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1009                         se_cmd);
1010         struct f_uas *fu = cmd->fu;
1011
1012         if (fu->flags & USBG_IS_BOT)
1013                 return bot_send_status_response(cmd);
1014         else
1015                 return uasp_send_status_response(cmd);
1016 }
1017
1018 static int usbg_send_write_request(struct se_cmd *se_cmd)
1019 {
1020         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1021                         se_cmd);
1022         struct f_uas *fu = cmd->fu;
1023
1024         if (fu->flags & USBG_IS_BOT)
1025                 return bot_send_write_request(cmd);
1026         else
1027                 return uasp_send_write_request(cmd);
1028 }
1029
1030 static int usbg_send_read_response(struct se_cmd *se_cmd)
1031 {
1032         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1033                         se_cmd);
1034         struct f_uas *fu = cmd->fu;
1035
1036         if (fu->flags & USBG_IS_BOT)
1037                 return bot_send_read_response(cmd);
1038         else
1039                 return uasp_send_read_response(cmd);
1040 }
1041
1042 static void usbg_cmd_work(struct work_struct *work)
1043 {
1044         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1045         struct se_cmd *se_cmd;
1046         struct tcm_usbg_nexus *tv_nexus;
1047         struct usbg_tpg *tpg;
1048         int dir;
1049
1050         se_cmd = &cmd->se_cmd;
1051         tpg = cmd->fu->tpg;
1052         tv_nexus = tpg->tpg_nexus;
1053         dir = get_cmd_dir(cmd->cmd_buf);
1054         if (dir < 0) {
1055                 transport_init_se_cmd(se_cmd,
1056                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1057                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1058                                 cmd->prio_attr, cmd->sense_iu.sense);
1059                 goto out;
1060         }
1061
1062         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1063                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1064                         0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1065                 goto out;
1066
1067         return;
1068
1069 out:
1070         transport_send_check_condition_and_sense(se_cmd,
1071                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1072         usbg_cleanup_cmd(cmd);
1073 }
1074
1075 static int usbg_submit_command(struct f_uas *fu,
1076                 void *cmdbuf, unsigned int len)
1077 {
1078         struct command_iu *cmd_iu = cmdbuf;
1079         struct usbg_cmd *cmd;
1080         struct usbg_tpg *tpg;
1081         struct se_cmd *se_cmd;
1082         struct tcm_usbg_nexus *tv_nexus;
1083         u32 cmd_len;
1084         int ret;
1085
1086         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1087                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1088                 return -EINVAL;
1089         }
1090
1091         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1092         if (!cmd)
1093                 return -ENOMEM;
1094
1095         cmd->fu = fu;
1096
1097         /* XXX until I figure out why I can't free in on complete */
1098         kref_init(&cmd->ref);
1099         kref_get(&cmd->ref);
1100
1101         tpg = fu->tpg;
1102         cmd_len = (cmd_iu->len & ~0x3) + 16;
1103         if (cmd_len > USBG_MAX_CMD)
1104                 goto err;
1105
1106         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1107
1108         cmd->tag = be16_to_cpup(&cmd_iu->tag);
1109         cmd->se_cmd.tag = cmd->tag;
1110         if (fu->flags & USBG_USE_STREAMS) {
1111                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1112                         goto err;
1113                 if (!cmd->tag)
1114                         cmd->stream = &fu->stream[0];
1115                 else
1116                         cmd->stream = &fu->stream[cmd->tag - 1];
1117         } else {
1118                 cmd->stream = &fu->stream[0];
1119         }
1120
1121         tv_nexus = tpg->tpg_nexus;
1122         if (!tv_nexus) {
1123                 pr_err("Missing nexus, ignoring command\n");
1124                 goto err;
1125         }
1126
1127         switch (cmd_iu->prio_attr & 0x7) {
1128         case UAS_HEAD_TAG:
1129                 cmd->prio_attr = TCM_HEAD_TAG;
1130                 break;
1131         case UAS_ORDERED_TAG:
1132                 cmd->prio_attr = TCM_ORDERED_TAG;
1133                 break;
1134         case UAS_ACA:
1135                 cmd->prio_attr = TCM_ACA_TAG;
1136                 break;
1137         default:
1138                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1139                                 cmd_iu->prio_attr);
1140         case UAS_SIMPLE_TAG:
1141                 cmd->prio_attr = TCM_SIMPLE_TAG;
1142                 break;
1143         }
1144
1145         se_cmd = &cmd->se_cmd;
1146         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1147
1148         INIT_WORK(&cmd->work, usbg_cmd_work);
1149         ret = queue_work(tpg->workqueue, &cmd->work);
1150         if (ret < 0)
1151                 goto err;
1152
1153         return 0;
1154 err:
1155         kfree(cmd);
1156         return -EINVAL;
1157 }
1158
1159 static void bot_cmd_work(struct work_struct *work)
1160 {
1161         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1162         struct se_cmd *se_cmd;
1163         struct tcm_usbg_nexus *tv_nexus;
1164         struct usbg_tpg *tpg;
1165         int dir;
1166
1167         se_cmd = &cmd->se_cmd;
1168         tpg = cmd->fu->tpg;
1169         tv_nexus = tpg->tpg_nexus;
1170         dir = get_cmd_dir(cmd->cmd_buf);
1171         if (dir < 0) {
1172                 transport_init_se_cmd(se_cmd,
1173                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1174                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1175                                 cmd->prio_attr, cmd->sense_iu.sense);
1176                 goto out;
1177         }
1178
1179         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1180                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1181                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1182                 goto out;
1183
1184         return;
1185
1186 out:
1187         transport_send_check_condition_and_sense(se_cmd,
1188                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1189         usbg_cleanup_cmd(cmd);
1190 }
1191
1192 static int bot_submit_command(struct f_uas *fu,
1193                 void *cmdbuf, unsigned int len)
1194 {
1195         struct bulk_cb_wrap *cbw = cmdbuf;
1196         struct usbg_cmd *cmd;
1197         struct usbg_tpg *tpg;
1198         struct se_cmd *se_cmd;
1199         struct tcm_usbg_nexus *tv_nexus;
1200         u32 cmd_len;
1201         int ret;
1202
1203         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1204                 pr_err("Wrong signature on CBW\n");
1205                 return -EINVAL;
1206         }
1207         if (len != 31) {
1208                 pr_err("Wrong length for CBW\n");
1209                 return -EINVAL;
1210         }
1211
1212         cmd_len = cbw->Length;
1213         if (cmd_len < 1 || cmd_len > 16)
1214                 return -EINVAL;
1215
1216         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1217         if (!cmd)
1218                 return -ENOMEM;
1219
1220         cmd->fu = fu;
1221
1222         /* XXX until I figure out why I can't free in on complete */
1223         kref_init(&cmd->ref);
1224         kref_get(&cmd->ref);
1225
1226         tpg = fu->tpg;
1227
1228         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1229
1230         cmd->bot_tag = cbw->Tag;
1231
1232         tv_nexus = tpg->tpg_nexus;
1233         if (!tv_nexus) {
1234                 pr_err("Missing nexus, ignoring command\n");
1235                 goto err;
1236         }
1237
1238         cmd->prio_attr = TCM_SIMPLE_TAG;
1239         se_cmd = &cmd->se_cmd;
1240         cmd->unpacked_lun = cbw->Lun;
1241         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1242         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1243         cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1244
1245         INIT_WORK(&cmd->work, bot_cmd_work);
1246         ret = queue_work(tpg->workqueue, &cmd->work);
1247         if (ret < 0)
1248                 goto err;
1249
1250         return 0;
1251 err:
1252         kfree(cmd);
1253         return -EINVAL;
1254 }
1255
1256 /* Start fabric.c code */
1257
1258 static int usbg_check_true(struct se_portal_group *se_tpg)
1259 {
1260         return 1;
1261 }
1262
1263 static int usbg_check_false(struct se_portal_group *se_tpg)
1264 {
1265         return 0;
1266 }
1267
1268 static char *usbg_get_fabric_name(void)
1269 {
1270         return "usb_gadget";
1271 }
1272
1273 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1274 {
1275         struct usbg_tpg *tpg = container_of(se_tpg,
1276                                 struct usbg_tpg, se_tpg);
1277         struct usbg_tport *tport = tpg->tport;
1278
1279         return &tport->tport_name[0];
1280 }
1281
1282 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1283 {
1284         struct usbg_tpg *tpg = container_of(se_tpg,
1285                                 struct usbg_tpg, se_tpg);
1286         return tpg->tport_tpgt;
1287 }
1288
1289 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1290 {
1291         return 1;
1292 }
1293
1294 static void usbg_cmd_release(struct kref *ref)
1295 {
1296         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1297                         ref);
1298
1299         transport_generic_free_cmd(&cmd->se_cmd, 0);
1300 }
1301
1302 static void usbg_release_cmd(struct se_cmd *se_cmd)
1303 {
1304         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1305                         se_cmd);
1306         kfree(cmd->data_buf);
1307         kfree(cmd);
1308         return;
1309 }
1310
1311 static int usbg_shutdown_session(struct se_session *se_sess)
1312 {
1313         return 0;
1314 }
1315
1316 static void usbg_close_session(struct se_session *se_sess)
1317 {
1318         return;
1319 }
1320
1321 static u32 usbg_sess_get_index(struct se_session *se_sess)
1322 {
1323         return 0;
1324 }
1325
1326 /*
1327  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1328  */
1329 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1330 {
1331         return 0;
1332 }
1333
1334 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1335 {
1336         return;
1337 }
1338
1339 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1340 {
1341         return 0;
1342 }
1343
1344 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1345 {
1346 }
1347
1348 static void usbg_aborted_task(struct se_cmd *se_cmd)
1349 {
1350         return;
1351 }
1352
1353 static const char *usbg_check_wwn(const char *name)
1354 {
1355         const char *n;
1356         unsigned int len;
1357
1358         n = strstr(name, "naa.");
1359         if (!n)
1360                 return NULL;
1361         n += 4;
1362         len = strlen(n);
1363         if (len == 0 || len > USBG_NAMELEN - 1)
1364                 return NULL;
1365         return n;
1366 }
1367
1368 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1369 {
1370         if (!usbg_check_wwn(name))
1371                 return -EINVAL;
1372         return 0;
1373 }
1374
1375 struct usbg_tpg *the_only_tpg_I_currently_have;
1376
1377 static struct se_portal_group *usbg_make_tpg(
1378         struct se_wwn *wwn,
1379         struct config_group *group,
1380         const char *name)
1381 {
1382         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1383                         tport_wwn);
1384         struct usbg_tpg *tpg;
1385         unsigned long tpgt;
1386         int ret;
1387
1388         if (strstr(name, "tpgt_") != name)
1389                 return ERR_PTR(-EINVAL);
1390         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1391                 return ERR_PTR(-EINVAL);
1392         if (the_only_tpg_I_currently_have) {
1393                 pr_err("Until the gadget framework can't handle multiple\n");
1394                 pr_err("gadgets, you can't do this here.\n");
1395                 return ERR_PTR(-EBUSY);
1396         }
1397
1398         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1399         if (!tpg)
1400                 return ERR_PTR(-ENOMEM);
1401         mutex_init(&tpg->tpg_mutex);
1402         atomic_set(&tpg->tpg_port_count, 0);
1403         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1404         if (!tpg->workqueue) {
1405                 kfree(tpg);
1406                 return NULL;
1407         }
1408
1409         tpg->tport = tport;
1410         tpg->tport_tpgt = tpgt;
1411
1412         /*
1413          * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1414          * pretend to be SAS..
1415          */
1416         ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1417         if (ret < 0) {
1418                 destroy_workqueue(tpg->workqueue);
1419                 kfree(tpg);
1420                 return NULL;
1421         }
1422         the_only_tpg_I_currently_have = tpg;
1423         return &tpg->se_tpg;
1424 }
1425
1426 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1427
1428 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1429 {
1430         struct usbg_tpg *tpg = container_of(se_tpg,
1431                                 struct usbg_tpg, se_tpg);
1432
1433         tcm_usbg_drop_nexus(tpg);
1434         core_tpg_deregister(se_tpg);
1435         destroy_workqueue(tpg->workqueue);
1436         kfree(tpg);
1437         the_only_tpg_I_currently_have = NULL;
1438 }
1439
1440 static struct se_wwn *usbg_make_tport(
1441         struct target_fabric_configfs *tf,
1442         struct config_group *group,
1443         const char *name)
1444 {
1445         struct usbg_tport *tport;
1446         const char *wnn_name;
1447         u64 wwpn = 0;
1448
1449         wnn_name = usbg_check_wwn(name);
1450         if (!wnn_name)
1451                 return ERR_PTR(-EINVAL);
1452
1453         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1454         if (!(tport))
1455                 return ERR_PTR(-ENOMEM);
1456         tport->tport_wwpn = wwpn;
1457         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1458         return &tport->tport_wwn;
1459 }
1460
1461 static void usbg_drop_tport(struct se_wwn *wwn)
1462 {
1463         struct usbg_tport *tport = container_of(wwn,
1464                                 struct usbg_tport, tport_wwn);
1465         kfree(tport);
1466 }
1467
1468 /*
1469  * If somebody feels like dropping the version property, go ahead.
1470  */
1471 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page)
1472 {
1473         return sprintf(page, "usb-gadget fabric module\n");
1474 }
1475
1476 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1477
1478 static struct configfs_attribute *usbg_wwn_attrs[] = {
1479         &usbg_wwn_attr_version,
1480         NULL,
1481 };
1482
1483 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1484 {
1485         struct se_portal_group *se_tpg = to_tpg(item);
1486         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1487
1488         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1489 }
1490
1491 static int usbg_attach(struct usbg_tpg *);
1492 static void usbg_detach(struct usbg_tpg *);
1493
1494 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1495                 const char *page, size_t count)
1496 {
1497         struct se_portal_group *se_tpg = to_tpg(item);
1498         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1499         unsigned long op;
1500         ssize_t ret;
1501
1502         ret = kstrtoul(page, 0, &op);
1503         if (ret < 0)
1504                 return -EINVAL;
1505         if (op > 1)
1506                 return -EINVAL;
1507
1508         if (op && tpg->gadget_connect) {
1509                 ret = -EINVAL;
1510                 goto out;
1511         }
1512         if (!op && !tpg->gadget_connect) {
1513                 ret = -EINVAL;
1514                 goto out;
1515         }
1516
1517         if (op) {
1518                 ret = usbg_attach(tpg);
1519                 if (ret)
1520                         goto out;
1521         } else {
1522                 usbg_detach(tpg);
1523         }
1524         tpg->gadget_connect = op;
1525
1526         return count;
1527 out:
1528         return ret;
1529 }
1530
1531 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1532 {
1533         struct se_portal_group *se_tpg = to_tpg(item);
1534         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1535         struct tcm_usbg_nexus *tv_nexus;
1536         ssize_t ret;
1537
1538         mutex_lock(&tpg->tpg_mutex);
1539         tv_nexus = tpg->tpg_nexus;
1540         if (!tv_nexus) {
1541                 ret = -ENODEV;
1542                 goto out;
1543         }
1544         ret = snprintf(page, PAGE_SIZE, "%s\n",
1545                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1546 out:
1547         mutex_unlock(&tpg->tpg_mutex);
1548         return ret;
1549 }
1550
1551 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1552 {
1553         struct se_portal_group *se_tpg;
1554         struct tcm_usbg_nexus *tv_nexus;
1555         int ret;
1556
1557         mutex_lock(&tpg->tpg_mutex);
1558         if (tpg->tpg_nexus) {
1559                 ret = -EEXIST;
1560                 pr_debug("tpg->tpg_nexus already exists\n");
1561                 goto err_unlock;
1562         }
1563         se_tpg = &tpg->se_tpg;
1564
1565         ret = -ENOMEM;
1566         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1567         if (!tv_nexus)
1568                 goto err_unlock;
1569         tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1570         if (IS_ERR(tv_nexus->tvn_se_sess))
1571                 goto err_free;
1572
1573         /*
1574          * Since we are running in 'demo mode' this call with generate a
1575          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1576          * the SCSI Initiator port name of the passed configfs group 'name'.
1577          */
1578         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1579                         se_tpg, name);
1580         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1581                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1582                                 " for %s\n", name);
1583                 goto err_session;
1584         }
1585         /*
1586          * Now register the TCM vHost virtual I_T Nexus as active.
1587          */
1588         transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1589                         tv_nexus->tvn_se_sess, tv_nexus);
1590         tpg->tpg_nexus = tv_nexus;
1591         mutex_unlock(&tpg->tpg_mutex);
1592         return 0;
1593
1594 err_session:
1595         transport_free_session(tv_nexus->tvn_se_sess);
1596 err_free:
1597         kfree(tv_nexus);
1598 err_unlock:
1599         mutex_unlock(&tpg->tpg_mutex);
1600         return ret;
1601 }
1602
1603 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1604 {
1605         struct se_session *se_sess;
1606         struct tcm_usbg_nexus *tv_nexus;
1607         int ret = -ENODEV;
1608
1609         mutex_lock(&tpg->tpg_mutex);
1610         tv_nexus = tpg->tpg_nexus;
1611         if (!tv_nexus)
1612                 goto out;
1613
1614         se_sess = tv_nexus->tvn_se_sess;
1615         if (!se_sess)
1616                 goto out;
1617
1618         if (atomic_read(&tpg->tpg_port_count)) {
1619                 ret = -EPERM;
1620                 pr_err("Unable to remove Host I_T Nexus with"
1621                                 " active TPG port count: %d\n",
1622                                 atomic_read(&tpg->tpg_port_count));
1623                 goto out;
1624         }
1625
1626         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1627                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1628         /*
1629          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1630          */
1631         transport_deregister_session(tv_nexus->tvn_se_sess);
1632         tpg->tpg_nexus = NULL;
1633
1634         kfree(tv_nexus);
1635         ret = 0;
1636 out:
1637         mutex_unlock(&tpg->tpg_mutex);
1638         return ret;
1639 }
1640
1641 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1642                 const char *page, size_t count)
1643 {
1644         struct se_portal_group *se_tpg = to_tpg(item);
1645         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1646         unsigned char i_port[USBG_NAMELEN], *ptr;
1647         int ret;
1648
1649         if (!strncmp(page, "NULL", 4)) {
1650                 ret = tcm_usbg_drop_nexus(tpg);
1651                 return (!ret) ? count : ret;
1652         }
1653         if (strlen(page) >= USBG_NAMELEN) {
1654                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1655                                 " max: %d\n", page, USBG_NAMELEN);
1656                 return -EINVAL;
1657         }
1658         snprintf(i_port, USBG_NAMELEN, "%s", page);
1659
1660         ptr = strstr(i_port, "naa.");
1661         if (!ptr) {
1662                 pr_err("Missing 'naa.' prefix\n");
1663                 return -EINVAL;
1664         }
1665
1666         if (i_port[strlen(i_port) - 1] == '\n')
1667                 i_port[strlen(i_port) - 1] = '\0';
1668
1669         ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1670         if (ret < 0)
1671                 return ret;
1672         return count;
1673 }
1674
1675 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1676 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1677
1678 static struct configfs_attribute *usbg_base_attrs[] = {
1679         &tcm_usbg_tpg_attr_enable,
1680         &tcm_usbg_tpg_attr_nexus,
1681         NULL,
1682 };
1683
1684 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1685 {
1686         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1687
1688         atomic_inc(&tpg->tpg_port_count);
1689         smp_mb__after_atomic();
1690         return 0;
1691 }
1692
1693 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1694                 struct se_lun *se_lun)
1695 {
1696         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1697
1698         atomic_dec(&tpg->tpg_port_count);
1699         smp_mb__after_atomic();
1700 }
1701
1702 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1703 {
1704         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1705                         se_cmd);
1706
1707         kref_put(&cmd->ref, usbg_cmd_release);
1708         return 1;
1709 }
1710
1711 static const struct target_core_fabric_ops usbg_ops = {
1712         .module                         = THIS_MODULE,
1713         .name                           = "usb_gadget",
1714         .get_fabric_name                = usbg_get_fabric_name,
1715         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1716         .tpg_get_tag                    = usbg_get_tag,
1717         .tpg_check_demo_mode            = usbg_check_true,
1718         .tpg_check_demo_mode_cache      = usbg_check_false,
1719         .tpg_check_demo_mode_write_protect = usbg_check_false,
1720         .tpg_check_prod_mode_write_protect = usbg_check_false,
1721         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1722         .release_cmd                    = usbg_release_cmd,
1723         .shutdown_session               = usbg_shutdown_session,
1724         .close_session                  = usbg_close_session,
1725         .sess_get_index                 = usbg_sess_get_index,
1726         .sess_get_initiator_sid         = NULL,
1727         .write_pending                  = usbg_send_write_request,
1728         .write_pending_status           = usbg_write_pending_status,
1729         .set_default_node_attributes    = usbg_set_default_node_attrs,
1730         .get_cmd_state                  = usbg_get_cmd_state,
1731         .queue_data_in                  = usbg_send_read_response,
1732         .queue_status                   = usbg_send_status_response,
1733         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1734         .aborted_task                   = usbg_aborted_task,
1735         .check_stop_free                = usbg_check_stop_free,
1736
1737         .fabric_make_wwn                = usbg_make_tport,
1738         .fabric_drop_wwn                = usbg_drop_tport,
1739         .fabric_make_tpg                = usbg_make_tpg,
1740         .fabric_drop_tpg                = usbg_drop_tpg,
1741         .fabric_post_link               = usbg_port_link,
1742         .fabric_pre_unlink              = usbg_port_unlink,
1743         .fabric_init_nodeacl            = usbg_init_nodeacl,
1744
1745         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1746         .tfc_tpg_base_attrs             = usbg_base_attrs,
1747 };
1748
1749 /* Start gadget.c code */
1750
1751 static struct usb_interface_descriptor bot_intf_desc = {
1752         .bLength =              sizeof(bot_intf_desc),
1753         .bDescriptorType =      USB_DT_INTERFACE,
1754         .bNumEndpoints =        2,
1755         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1756         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1757         .bInterfaceSubClass =   USB_SC_SCSI,
1758         .bInterfaceProtocol =   USB_PR_BULK,
1759 };
1760
1761 static struct usb_interface_descriptor uasp_intf_desc = {
1762         .bLength =              sizeof(uasp_intf_desc),
1763         .bDescriptorType =      USB_DT_INTERFACE,
1764         .bNumEndpoints =        4,
1765         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1766         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1767         .bInterfaceSubClass =   USB_SC_SCSI,
1768         .bInterfaceProtocol =   USB_PR_UAS,
1769 };
1770
1771 static struct usb_endpoint_descriptor uasp_bi_desc = {
1772         .bLength =              USB_DT_ENDPOINT_SIZE,
1773         .bDescriptorType =      USB_DT_ENDPOINT,
1774         .bEndpointAddress =     USB_DIR_IN,
1775         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1776         .wMaxPacketSize =       cpu_to_le16(512),
1777 };
1778
1779 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1780         .bLength =              USB_DT_ENDPOINT_SIZE,
1781         .bDescriptorType =      USB_DT_ENDPOINT,
1782         .bEndpointAddress =     USB_DIR_IN,
1783         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1784 };
1785
1786 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1787         .bLength =              sizeof(uasp_bi_pipe_desc),
1788         .bDescriptorType =      USB_DT_PIPE_USAGE,
1789         .bPipeID =              DATA_IN_PIPE_ID,
1790 };
1791
1792 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1793         .bLength =              USB_DT_ENDPOINT_SIZE,
1794         .bDescriptorType =      USB_DT_ENDPOINT,
1795         .bEndpointAddress =     USB_DIR_IN,
1796         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1797         .wMaxPacketSize =       cpu_to_le16(1024),
1798 };
1799
1800 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1801         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1802         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1803         .bMaxBurst =            0,
1804         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1805         .wBytesPerInterval =    0,
1806 };
1807
1808 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1809         .bLength =              sizeof(bot_bi_ep_comp_desc),
1810         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1811         .bMaxBurst =            0,
1812 };
1813
1814 static struct usb_endpoint_descriptor uasp_bo_desc = {
1815         .bLength =              USB_DT_ENDPOINT_SIZE,
1816         .bDescriptorType =      USB_DT_ENDPOINT,
1817         .bEndpointAddress =     USB_DIR_OUT,
1818         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1819         .wMaxPacketSize =       cpu_to_le16(512),
1820 };
1821
1822 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1823         .bLength =              USB_DT_ENDPOINT_SIZE,
1824         .bDescriptorType =      USB_DT_ENDPOINT,
1825         .bEndpointAddress =     USB_DIR_OUT,
1826         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1827 };
1828
1829 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1830         .bLength =              sizeof(uasp_bo_pipe_desc),
1831         .bDescriptorType =      USB_DT_PIPE_USAGE,
1832         .bPipeID =              DATA_OUT_PIPE_ID,
1833 };
1834
1835 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1836         .bLength =              USB_DT_ENDPOINT_SIZE,
1837         .bDescriptorType =      USB_DT_ENDPOINT,
1838         .bEndpointAddress =     USB_DIR_OUT,
1839         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1840         .wMaxPacketSize =       cpu_to_le16(0x400),
1841 };
1842
1843 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1844         .bLength =              sizeof(uasp_bo_ep_comp_desc),
1845         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1846         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1847 };
1848
1849 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1850         .bLength =              sizeof(bot_bo_ep_comp_desc),
1851         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1852 };
1853
1854 static struct usb_endpoint_descriptor uasp_status_desc = {
1855         .bLength =              USB_DT_ENDPOINT_SIZE,
1856         .bDescriptorType =      USB_DT_ENDPOINT,
1857         .bEndpointAddress =     USB_DIR_IN,
1858         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1859         .wMaxPacketSize =       cpu_to_le16(512),
1860 };
1861
1862 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1863         .bLength =              USB_DT_ENDPOINT_SIZE,
1864         .bDescriptorType =      USB_DT_ENDPOINT,
1865         .bEndpointAddress =     USB_DIR_IN,
1866         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1867 };
1868
1869 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1870         .bLength =              sizeof(uasp_status_pipe_desc),
1871         .bDescriptorType =      USB_DT_PIPE_USAGE,
1872         .bPipeID =              STATUS_PIPE_ID,
1873 };
1874
1875 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1876         .bLength =              USB_DT_ENDPOINT_SIZE,
1877         .bDescriptorType =      USB_DT_ENDPOINT,
1878         .bEndpointAddress =     USB_DIR_IN,
1879         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1880         .wMaxPacketSize =       cpu_to_le16(1024),
1881 };
1882
1883 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1884         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
1885         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1886         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1887 };
1888
1889 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1890         .bLength =              USB_DT_ENDPOINT_SIZE,
1891         .bDescriptorType =      USB_DT_ENDPOINT,
1892         .bEndpointAddress =     USB_DIR_OUT,
1893         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1894         .wMaxPacketSize =       cpu_to_le16(512),
1895 };
1896
1897 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1898         .bLength =              USB_DT_ENDPOINT_SIZE,
1899         .bDescriptorType =      USB_DT_ENDPOINT,
1900         .bEndpointAddress =     USB_DIR_OUT,
1901         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1902 };
1903
1904 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1905         .bLength =              sizeof(uasp_cmd_pipe_desc),
1906         .bDescriptorType =      USB_DT_PIPE_USAGE,
1907         .bPipeID =              CMD_PIPE_ID,
1908 };
1909
1910 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1911         .bLength =              USB_DT_ENDPOINT_SIZE,
1912         .bDescriptorType =      USB_DT_ENDPOINT,
1913         .bEndpointAddress =     USB_DIR_OUT,
1914         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1915         .wMaxPacketSize =       cpu_to_le16(1024),
1916 };
1917
1918 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1919         .bLength =              sizeof(uasp_cmd_comp_desc),
1920         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1921 };
1922
1923 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1924         (struct usb_descriptor_header *) &bot_intf_desc,
1925         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1926         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1927
1928         (struct usb_descriptor_header *) &uasp_intf_desc,
1929         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1930         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1931         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1932         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1933         (struct usb_descriptor_header *) &uasp_fs_status_desc,
1934         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1935         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1936         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1937         NULL,
1938 };
1939
1940 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1941         (struct usb_descriptor_header *) &bot_intf_desc,
1942         (struct usb_descriptor_header *) &uasp_bi_desc,
1943         (struct usb_descriptor_header *) &uasp_bo_desc,
1944
1945         (struct usb_descriptor_header *) &uasp_intf_desc,
1946         (struct usb_descriptor_header *) &uasp_bi_desc,
1947         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1948         (struct usb_descriptor_header *) &uasp_bo_desc,
1949         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1950         (struct usb_descriptor_header *) &uasp_status_desc,
1951         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1952         (struct usb_descriptor_header *) &uasp_cmd_desc,
1953         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1954         NULL,
1955 };
1956
1957 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1958         (struct usb_descriptor_header *) &bot_intf_desc,
1959         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1960         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1961         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1962         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1963
1964         (struct usb_descriptor_header *) &uasp_intf_desc,
1965         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1966         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1967         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1968         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1969         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1970         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1971         (struct usb_descriptor_header *) &uasp_ss_status_desc,
1972         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1973         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1974         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1975         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1976         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1977         NULL,
1978 };
1979
1980 #define UAS_VENDOR_ID   0x0525  /* NetChip */
1981 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
1982
1983 static struct usb_device_descriptor usbg_device_desc = {
1984         .bLength =              sizeof(usbg_device_desc),
1985         .bDescriptorType =      USB_DT_DEVICE,
1986         .bcdUSB =               cpu_to_le16(0x0200),
1987         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
1988         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
1989         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
1990         .bNumConfigurations =   1,
1991 };
1992
1993 #define USB_G_STR_CONFIG USB_GADGET_FIRST_AVAIL_IDX
1994
1995 static struct usb_string        usbg_us_strings[] = {
1996         [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
1997         [USB_GADGET_PRODUCT_IDX].s      = "Target Product",
1998         [USB_GADGET_SERIAL_IDX].s       = "000000000001",
1999         [USB_G_STR_CONFIG].s            = "default config",
2000         { },
2001 };
2002
2003 static struct usb_gadget_strings usbg_stringtab = {
2004         .language = 0x0409,
2005         .strings = usbg_us_strings,
2006 };
2007
2008 static struct usb_gadget_strings *usbg_strings[] = {
2009         &usbg_stringtab,
2010         NULL,
2011 };
2012
2013 static struct usb_string        tcm_us_strings[] = {
2014         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
2015         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
2016         { },
2017 };
2018
2019 static struct usb_gadget_strings tcm_stringtab = {
2020         .language = 0x0409,
2021         .strings = tcm_us_strings,
2022 };
2023
2024 static struct usb_gadget_strings *tcm_strings[] = {
2025         &tcm_stringtab,
2026         NULL,
2027 };
2028
2029 static int guas_unbind(struct usb_composite_dev *cdev)
2030 {
2031         return 0;
2032 }
2033
2034 static struct usb_configuration usbg_config_driver = {
2035         .label                  = "Linux Target",
2036         .bConfigurationValue    = 1,
2037         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2038 };
2039
2040 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2041 {
2042         struct f_uas            *fu = to_f_uas(f);
2043         struct usb_gadget       *gadget = c->cdev->gadget;
2044         struct usb_ep           *ep;
2045         int                     iface;
2046         int                     ret;
2047
2048         iface = usb_interface_id(c, f);
2049         if (iface < 0)
2050                 return iface;
2051
2052         bot_intf_desc.bInterfaceNumber = iface;
2053         uasp_intf_desc.bInterfaceNumber = iface;
2054         fu->iface = iface;
2055         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2056                         &uasp_bi_ep_comp_desc);
2057         if (!ep)
2058                 goto ep_fail;
2059         fu->ep_in = ep;
2060
2061         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2062                         &uasp_bo_ep_comp_desc);
2063         if (!ep)
2064                 goto ep_fail;
2065         fu->ep_out = ep;
2066
2067         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2068                         &uasp_status_in_ep_comp_desc);
2069         if (!ep)
2070                 goto ep_fail;
2071         fu->ep_status = ep;
2072
2073         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2074                         &uasp_cmd_comp_desc);
2075         if (!ep)
2076                 goto ep_fail;
2077         fu->ep_cmd = ep;
2078
2079         /* Assume endpoint addresses are the same for both speeds */
2080         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2081         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2082         uasp_status_desc.bEndpointAddress =
2083                 uasp_ss_status_desc.bEndpointAddress;
2084         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2085
2086         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2087         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2088         uasp_fs_status_desc.bEndpointAddress =
2089                 uasp_ss_status_desc.bEndpointAddress;
2090         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2091
2092         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2093                         uasp_hs_function_desc, uasp_ss_function_desc);
2094         if (ret)
2095                 goto ep_fail;
2096
2097         return 0;
2098 ep_fail:
2099         pr_err("Can't claim all required eps\n");
2100         return -ENOTSUPP;
2101 }
2102
2103 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2104 {
2105         struct f_uas *fu = to_f_uas(f);
2106
2107         usb_free_all_descriptors(f);
2108         kfree(fu);
2109 }
2110
2111 struct guas_setup_wq {
2112         struct work_struct work;
2113         struct f_uas *fu;
2114         unsigned int alt;
2115 };
2116
2117 static void usbg_delayed_set_alt(struct work_struct *wq)
2118 {
2119         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2120                         work);
2121         struct f_uas *fu = work->fu;
2122         int alt = work->alt;
2123
2124         kfree(work);
2125
2126         if (fu->flags & USBG_IS_BOT)
2127                 bot_cleanup_old_alt(fu);
2128         if (fu->flags & USBG_IS_UAS)
2129                 uasp_cleanup_old_alt(fu);
2130
2131         if (alt == USB_G_ALT_INT_BBB)
2132                 bot_set_alt(fu);
2133         else if (alt == USB_G_ALT_INT_UAS)
2134                 uasp_set_alt(fu);
2135         usb_composite_setup_continue(fu->function.config->cdev);
2136 }
2137
2138 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2139 {
2140         struct f_uas *fu = to_f_uas(f);
2141
2142         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2143                 struct guas_setup_wq *work;
2144
2145                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2146                 if (!work)
2147                         return -ENOMEM;
2148                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2149                 work->fu = fu;
2150                 work->alt = alt;
2151                 schedule_work(&work->work);
2152                 return USB_GADGET_DELAYED_STATUS;
2153         }
2154         return -EOPNOTSUPP;
2155 }
2156
2157 static void usbg_disable(struct usb_function *f)
2158 {
2159         struct f_uas *fu = to_f_uas(f);
2160
2161         if (fu->flags & USBG_IS_UAS)
2162                 uasp_cleanup_old_alt(fu);
2163         else if (fu->flags & USBG_IS_BOT)
2164                 bot_cleanup_old_alt(fu);
2165         fu->flags = 0;
2166 }
2167
2168 static int usbg_setup(struct usb_function *f,
2169                 const struct usb_ctrlrequest *ctrl)
2170 {
2171         struct f_uas *fu = to_f_uas(f);
2172
2173         if (!(fu->flags & USBG_IS_BOT))
2174                 return -EOPNOTSUPP;
2175
2176         return usbg_bot_setup(f, ctrl);
2177 }
2178
2179 static int usbg_cfg_bind(struct usb_configuration *c)
2180 {
2181         struct f_uas *fu;
2182         int ret;
2183
2184         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2185         if (!fu)
2186                 return -ENOMEM;
2187         fu->function.name = "Target Function";
2188         fu->function.bind = usbg_bind;
2189         fu->function.unbind = usbg_unbind;
2190         fu->function.set_alt = usbg_set_alt;
2191         fu->function.setup = usbg_setup;
2192         fu->function.disable = usbg_disable;
2193         fu->function.strings = tcm_strings;
2194         fu->tpg = the_only_tpg_I_currently_have;
2195
2196         bot_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_BBB].id;
2197         uasp_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_UAS].id;
2198
2199         ret = usb_add_function(c, &fu->function);
2200         if (ret)
2201                 goto err;
2202
2203         return 0;
2204 err:
2205         kfree(fu);
2206         return ret;
2207 }
2208
2209 static int usb_target_bind(struct usb_composite_dev *cdev)
2210 {
2211         int ret;
2212
2213         ret = usb_string_ids_tab(cdev, usbg_us_strings);
2214         if (ret)
2215                 return ret;
2216
2217         usbg_device_desc.iManufacturer =
2218                 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2219         usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2220         usbg_device_desc.iSerialNumber =
2221                 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2222         usbg_config_driver.iConfiguration =
2223                 usbg_us_strings[USB_G_STR_CONFIG].id;
2224
2225         ret = usb_add_config(cdev, &usbg_config_driver,
2226                         usbg_cfg_bind);
2227         if (ret)
2228                 return ret;
2229         usb_composite_overwrite_options(cdev, &coverwrite);
2230         return 0;
2231 }
2232
2233 static struct usb_composite_driver usbg_driver = {
2234         .name           = "g_target",
2235         .dev            = &usbg_device_desc,
2236         .strings        = usbg_strings,
2237         .max_speed      = USB_SPEED_SUPER,
2238         .bind           = usb_target_bind,
2239         .unbind         = guas_unbind,
2240 };
2241
2242 static int usbg_attach(struct usbg_tpg *tpg)
2243 {
2244         return usb_composite_probe(&usbg_driver);
2245 }
2246
2247 static void usbg_detach(struct usbg_tpg *tpg)
2248 {
2249         usb_composite_unregister(&usbg_driver);
2250 }
2251
2252 static int __init usb_target_gadget_init(void)
2253 {
2254         return target_register_template(&usbg_ops);
2255 }
2256 module_init(usb_target_gadget_init);
2257
2258 static void __exit usb_target_gadget_exit(void)
2259 {
2260         target_unregister_template(&usbg_ops);
2261 }
2262 module_exit(usb_target_gadget_exit);
2263
2264 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2265 MODULE_DESCRIPTION("usb-gadget fabric");
2266 MODULE_LICENSE("GPL v2");