drivers/usb/gadget/function/f_tcm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Target based USB-Gadget
   3  *
   4  * UAS protocol handling, target callbacks, configfs handling,
   5  * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
   6  *
   7  * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/configfs.h>
  14 #include <linux/ctype.h>
  15 #include <linux/usb/ch9.h>
  16 #include <linux/usb/composite.h>
  17 #include <linux/usb/gadget.h>
  18 #include <linux/usb/storage.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include <target/target_core_base.h>
  21 #include <target/target_core_fabric.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "tcm.h"
  25 #include "u_tcm.h"
  26 #include "configfs.h"
  27
  28 #define TPG_INSTANCES           1
  29
  30 struct tpg_instance {
  31         struct usb_function_instance    *func_inst;
  32         struct usbg_tpg                 *tpg;
  33 };
  34
  35 static struct tpg_instance tpg_instances[TPG_INSTANCES];
  36
  37 static DEFINE_MUTEX(tpg_instances_lock);
  38
  39 static inline struct f_uas *to_f_uas(struct usb_function *f)
  40 {
  41         return container_of(f, struct f_uas, function);
  42 }
  43
  44 /* Start bot.c code */
  45
  46 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
  47 {
  48         int ret;
  49
  50         if (fu->flags & USBG_BOT_CMD_PEND)
  51                 return 0;
  52
  53         ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
  54         if (!ret)
  55                 fu->flags |= USBG_BOT_CMD_PEND;
  56         return ret;
  57 }
  58
  59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
  60 {
  61         struct usbg_cmd *cmd = req->context;
  62         struct f_uas *fu = cmd->fu;
  63
  64         transport_generic_free_cmd(&cmd->se_cmd, 0);
  65         if (req->status < 0) {
  66                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
  67                 return;
  68         }
  69
  70         /* CSW completed, wait for next CBW */
  71         bot_enqueue_cmd_cbw(fu);
  72 }
  73
  74 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
  75 {
  76         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
  77         int ret;
  78         unsigned int csw_stat;
  79
  80         csw_stat = cmd->csw_code;
  81         csw->Tag = cmd->bot_tag;
  82         csw->Status = csw_stat;
  83         fu->bot_status.req->context = cmd;
  84         ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
  85         if (ret)
  86                 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
  87 }
  88
  89 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
  90 {
  91         struct usbg_cmd *cmd = req->context;
  92         struct f_uas *fu = cmd->fu;
  93
  94         if (req->status < 0)
  95                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
  96
  97         if (cmd->data_len) {
  98                 if (cmd->data_len > ep->maxpacket) {
  99                         req->length = ep->maxpacket;
 100                         cmd->data_len -= ep->maxpacket;
 101                 } else {
 102                         req->length = cmd->data_len;
 103                         cmd->data_len = 0;
 104                 }
 105
 106                 usb_ep_queue(ep, req, GFP_ATOMIC);
 107                 return;
 108         }
 109         bot_enqueue_sense_code(fu, cmd);
 110 }
 111
 112 static void bot_send_bad_status(struct usbg_cmd *cmd)
 113 {
 114         struct f_uas *fu = cmd->fu;
 115         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 116         struct usb_request *req;
 117         struct usb_ep *ep;
 118
 119         csw->Residue = cpu_to_le32(cmd->data_len);
 120
 121         if (cmd->data_len) {
 122                 if (cmd->is_read) {
 123                         ep = fu->ep_in;
 124                         req = fu->bot_req_in;
 125                 } else {
 126                         ep = fu->ep_out;
 127                         req = fu->bot_req_out;
 128                 }
 129
 130                 if (cmd->data_len > fu->ep_in->maxpacket) {
 131                         req->length = ep->maxpacket;
 132                         cmd->data_len -= ep->maxpacket;
 133                 } else {
 134                         req->length = cmd->data_len;
 135                         cmd->data_len = 0;
 136                 }
 137                 req->complete = bot_err_compl;
 138                 req->context = cmd;
 139                 req->buf = fu->cmd.buf;
 140                 usb_ep_queue(ep, req, GFP_KERNEL);
 141         } else {
 142                 bot_enqueue_sense_code(fu, cmd);
 143         }
 144 }
 145
 146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
 147 {
 148         struct f_uas *fu = cmd->fu;
 149         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 150         int ret;
 151
 152         if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
 153                 if (!moved_data && cmd->data_len) {
 154                         /*
 155                          * the host wants to move data, we don't. Fill / empty
 156                          * the pipe and then send the csw with reside set.
 157                          */
 158                         cmd->csw_code = US_BULK_STAT_OK;
 159                         bot_send_bad_status(cmd);
 160                         return 0;
 161                 }
 162
 163                 csw->Tag = cmd->bot_tag;
 164                 csw->Residue = cpu_to_le32(0);
 165                 csw->Status = US_BULK_STAT_OK;
 166                 fu->bot_status.req->context = cmd;
 167
 168                 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
 169                 if (ret)
 170                         pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
 171         } else {
 172                 cmd->csw_code = US_BULK_STAT_FAIL;
 173                 bot_send_bad_status(cmd);
 174         }
 175         return 0;
 176 }
 177
 178 /*
 179  * Called after command (no data transfer) or after the write (to device)
 180  * operation is completed
 181  */
 182 static int bot_send_status_response(struct usbg_cmd *cmd)
 183 {
 184         bool moved_data = false;
 185
 186         if (!cmd->is_read)
 187                 moved_data = true;
 188         return bot_send_status(cmd, moved_data);
 189 }
 190
 191 /* Read request completed, now we have to send the CSW */
 192 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
 193 {
 194         struct usbg_cmd *cmd = req->context;
 195
 196         if (req->status < 0)
 197                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 198
 199         bot_send_status(cmd, true);
 200 }
 201
 202 static int bot_send_read_response(struct usbg_cmd *cmd)
 203 {
 204         struct f_uas *fu = cmd->fu;
 205         struct se_cmd *se_cmd = &cmd->se_cmd;
 206         struct usb_gadget *gadget = fuas_to_gadget(fu);
 207         int ret;
 208
 209         if (!cmd->data_len) {
 210                 cmd->csw_code = US_BULK_STAT_PHASE;
 211                 bot_send_bad_status(cmd);
 212                 return 0;
 213         }
 214
 215         if (!gadget->sg_supported) {
 216                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 217                 if (!cmd->data_buf)
 218                         return -ENOMEM;
 219
 220                 sg_copy_to_buffer(se_cmd->t_data_sg,
 221                                 se_cmd->t_data_nents,
 222                                 cmd->data_buf,
 223                                 se_cmd->data_length);
 224
 225                 fu->bot_req_in->buf = cmd->data_buf;
 226         } else {
 227                 fu->bot_req_in->buf = NULL;
 228                 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
 229                 fu->bot_req_in->sg = se_cmd->t_data_sg;
 230         }
 231
 232         fu->bot_req_in->complete = bot_read_compl;
 233         fu->bot_req_in->length = se_cmd->data_length;
 234         fu->bot_req_in->context = cmd;
 235         ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
 236         if (ret)
 237                 pr_err("%s(%d)\n", __func__, __LINE__);
 238         return 0;
 239 }
 240
 241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
 242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
 243
 244 static int bot_send_write_request(struct usbg_cmd *cmd)
 245 {
 246         struct f_uas *fu = cmd->fu;
 247         struct se_cmd *se_cmd = &cmd->se_cmd;
 248         struct usb_gadget *gadget = fuas_to_gadget(fu);
 249         int ret;
 250
 251         init_completion(&cmd->write_complete);
 252         cmd->fu = fu;
 253
 254         if (!cmd->data_len) {
 255                 cmd->csw_code = US_BULK_STAT_PHASE;
 256                 return -EINVAL;
 257         }
 258
 259         if (!gadget->sg_supported) {
 260                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
 261                 if (!cmd->data_buf)
 262                         return -ENOMEM;
 263
 264                 fu->bot_req_out->buf = cmd->data_buf;
 265         } else {
 266                 fu->bot_req_out->buf = NULL;
 267                 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
 268                 fu->bot_req_out->sg = se_cmd->t_data_sg;
 269         }
 270
 271         fu->bot_req_out->complete = usbg_data_write_cmpl;
 272         fu->bot_req_out->length = se_cmd->data_length;
 273         fu->bot_req_out->context = cmd;
 274
 275         ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
 276         if (ret)
 277                 goto cleanup;
 278         ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
 279         if (ret)
 280                 pr_err("%s(%d)\n", __func__, __LINE__);
 281
 282         wait_for_completion(&cmd->write_complete);
 283         target_execute_cmd(se_cmd);
 284 cleanup:
 285         return ret;
 286 }
 287
 288 static int bot_submit_command(struct f_uas *, void *, unsigned int);
 289
 290 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 291 {
 292         struct f_uas *fu = req->context;
 293         int ret;
 294
 295         fu->flags &= ~USBG_BOT_CMD_PEND;
 296
 297         if (req->status < 0)
 298                 return;
 299
 300         ret = bot_submit_command(fu, req->buf, req->actual);
 301         if (ret)
 302                 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
 303 }
 304
 305 static int bot_prepare_reqs(struct f_uas *fu)
 306 {
 307         int ret;
 308
 309         fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 310         if (!fu->bot_req_in)
 311                 goto err;
 312
 313         fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 314         if (!fu->bot_req_out)
 315                 goto err_out;
 316
 317         fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 318         if (!fu->cmd.req)
 319                 goto err_cmd;
 320
 321         fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 322         if (!fu->bot_status.req)
 323                 goto err_sts;
 324
 325         fu->bot_status.req->buf = &fu->bot_status.csw;
 326         fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
 327         fu->bot_status.req->complete = bot_status_complete;
 328         fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
 329
 330         fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
 331         if (!fu->cmd.buf)
 332                 goto err_buf;
 333
 334         fu->cmd.req->complete = bot_cmd_complete;
 335         fu->cmd.req->buf = fu->cmd.buf;
 336         fu->cmd.req->length = fu->ep_out->maxpacket;
 337         fu->cmd.req->context = fu;
 338
 339         ret = bot_enqueue_cmd_cbw(fu);
 340         if (ret)
 341                 goto err_queue;
 342         return 0;
 343 err_queue:
 344         kfree(fu->cmd.buf);
 345         fu->cmd.buf = NULL;
 346 err_buf:
 347         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
 348 err_sts:
 349         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 350         fu->cmd.req = NULL;
 351 err_cmd:
 352         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 353         fu->bot_req_out = NULL;
 354 err_out:
 355         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 356         fu->bot_req_in = NULL;
 357 err:
 358         pr_err("BOT: endpoint setup failed\n");
 359         return -ENOMEM;
 360 }
 361
 362 static void bot_cleanup_old_alt(struct f_uas *fu)
 363 {
 364         if (!(fu->flags & USBG_ENABLED))
 365                 return;
 366
 367         usb_ep_disable(fu->ep_in);
 368         usb_ep_disable(fu->ep_out);
 369
 370         if (!fu->bot_req_in)
 371                 return;
 372
 373         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 374         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 375         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 376         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
 377
 378         kfree(fu->cmd.buf);
 379
 380         fu->bot_req_in = NULL;
 381         fu->bot_req_out = NULL;
 382         fu->cmd.req = NULL;
 383         fu->bot_status.req = NULL;
 384         fu->cmd.buf = NULL;
 385 }
 386
 387 static void bot_set_alt(struct f_uas *fu)
 388 {
 389         struct usb_function *f = &fu->function;
 390         struct usb_gadget *gadget = f->config->cdev->gadget;
 391         int ret;
 392
 393         fu->flags = USBG_IS_BOT;
 394
 395         config_ep_by_speed(gadget, f, fu->ep_in);
 396         ret = usb_ep_enable(fu->ep_in);
 397         if (ret)
 398                 goto err_b_in;
 399
 400         config_ep_by_speed(gadget, f, fu->ep_out);
 401         ret = usb_ep_enable(fu->ep_out);
 402         if (ret)
 403                 goto err_b_out;
 404
 405         ret = bot_prepare_reqs(fu);
 406         if (ret)
 407                 goto err_wq;
 408         fu->flags |= USBG_ENABLED;
 409         pr_info("Using the BOT protocol\n");
 410         return;
 411 err_wq:
 412         usb_ep_disable(fu->ep_out);
 413 err_b_out:
 414         usb_ep_disable(fu->ep_in);
 415 err_b_in:
 416         fu->flags = USBG_IS_BOT;
 417 }
 418
 419 static int usbg_bot_setup(struct usb_function *f,
 420                 const struct usb_ctrlrequest *ctrl)
 421 {
 422         struct f_uas *fu = to_f_uas(f);
 423         struct usb_composite_dev *cdev = f->config->cdev;
 424         u16 w_value = le16_to_cpu(ctrl->wValue);
 425         u16 w_length = le16_to_cpu(ctrl->wLength);
 426         int luns;
 427         u8 *ret_lun;
 428
 429         switch (ctrl->bRequest) {
 430         case US_BULK_GET_MAX_LUN:
 431                 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
 432                                         USB_RECIP_INTERFACE))
 433                         return -ENOTSUPP;
 434
 435                 if (w_length < 1)
 436                         return -EINVAL;
 437                 if (w_value != 0)
 438                         return -EINVAL;
 439                 luns = atomic_read(&fu->tpg->tpg_port_count);
 440                 if (!luns) {
 441                         pr_err("No LUNs configured?\n");
 442                         return -EINVAL;
 443                 }
 444                 /*
 445                  * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
 446                  * accessed. The upper limit is 0xf
 447                  */
 448                 luns--;
 449                 if (luns > 0xf) {
 450                         pr_info_once("Limiting the number of luns to 16\n");
 451                         luns = 0xf;
 452                 }
 453                 ret_lun = cdev->req->buf;
 454                 *ret_lun = luns;
 455                 cdev->req->length = 1;
 456                 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
 457
 458         case US_BULK_RESET_REQUEST:
 459                 /* XXX maybe we should remove previous requests for IN + OUT */
 460                 bot_enqueue_cmd_cbw(fu);
 461                 return 0;
 462         }
 463         return -ENOTSUPP;
 464 }
 465
 466 /* Start uas.c code */
 467
 468 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
 469 {
 470         /* We have either all three allocated or none */
 471         if (!stream->req_in)
 472                 return;
 473
 474         usb_ep_free_request(fu->ep_in, stream->req_in);
 475         usb_ep_free_request(fu->ep_out, stream->req_out);
 476         usb_ep_free_request(fu->ep_status, stream->req_status);
 477
 478         stream->req_in = NULL;
 479         stream->req_out = NULL;
 480         stream->req_status = NULL;
 481 }
 482
 483 static void uasp_free_cmdreq(struct f_uas *fu)
 484 {
 485         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 486         kfree(fu->cmd.buf);
 487         fu->cmd.req = NULL;
 488         fu->cmd.buf = NULL;
 489 }
 490
 491 static void uasp_cleanup_old_alt(struct f_uas *fu)
 492 {
 493         int i;
 494
 495         if (!(fu->flags & USBG_ENABLED))
 496                 return;
 497
 498         usb_ep_disable(fu->ep_in);
 499         usb_ep_disable(fu->ep_out);
 500         usb_ep_disable(fu->ep_status);
 501         usb_ep_disable(fu->ep_cmd);
 502
 503         for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
 504                 uasp_cleanup_one_stream(fu, &fu->stream[i]);
 505         uasp_free_cmdreq(fu);
 506 }
 507
 508 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
 509
 510 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
 511 {
 512         struct se_cmd *se_cmd = &cmd->se_cmd;
 513         struct f_uas *fu = cmd->fu;
 514         struct usb_gadget *gadget = fuas_to_gadget(fu);
 515         struct uas_stream *stream = cmd->stream;
 516
 517         if (!gadget->sg_supported) {
 518                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 519                 if (!cmd->data_buf)
 520                         return -ENOMEM;
 521
 522                 sg_copy_to_buffer(se_cmd->t_data_sg,
 523                                 se_cmd->t_data_nents,
 524                                 cmd->data_buf,
 525                                 se_cmd->data_length);
 526
 527                 stream->req_in->buf = cmd->data_buf;
 528         } else {
 529                 stream->req_in->buf = NULL;
 530                 stream->req_in->num_sgs = se_cmd->t_data_nents;
 531                 stream->req_in->sg = se_cmd->t_data_sg;
 532         }
 533
 534         stream->req_in->complete = uasp_status_data_cmpl;
 535         stream->req_in->length = se_cmd->data_length;
 536         stream->req_in->context = cmd;
 537
 538         cmd->state = UASP_SEND_STATUS;
 539         return 0;
 540 }
 541
 542 static void uasp_prepare_status(struct usbg_cmd *cmd)
 543 {
 544         struct se_cmd *se_cmd = &cmd->se_cmd;
 545         struct sense_iu *iu = &cmd->sense_iu;
 546         struct uas_stream *stream = cmd->stream;
 547
 548         cmd->state = UASP_QUEUE_COMMAND;
 549         iu->iu_id = IU_ID_STATUS;
 550         iu->tag = cpu_to_be16(cmd->tag);
 551
 552         /*
 553          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
 554          */
 555         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
 556         iu->status = se_cmd->scsi_status;
 557         stream->req_status->context = cmd;
 558         stream->req_status->length = se_cmd->scsi_sense_length + 16;
 559         stream->req_status->buf = iu;
 560         stream->req_status->complete = uasp_status_data_cmpl;
 561 }
 562
 563 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
 564 {
 565         struct usbg_cmd *cmd = req->context;
 566         struct uas_stream *stream = cmd->stream;
 567         struct f_uas *fu = cmd->fu;
 568         int ret;
 569
 570         if (req->status < 0)
 571                 goto cleanup;
 572
 573         switch (cmd->state) {
 574         case UASP_SEND_DATA:
 575                 ret = uasp_prepare_r_request(cmd);
 576                 if (ret)
 577                         goto cleanup;
 578                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 579                 if (ret)
 580                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 581                 break;
 582
 583         case UASP_RECEIVE_DATA:
 584                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 585                 if (ret)
 586                         goto cleanup;
 587                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 588                 if (ret)
 589                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 590                 break;
 591
 592         case UASP_SEND_STATUS:
 593                 uasp_prepare_status(cmd);
 594                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 595                                 GFP_ATOMIC);
 596                 if (ret)
 597                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 598                 break;
 599
 600         case UASP_QUEUE_COMMAND:
 601                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 602                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 603                 break;
 604
 605         default:
 606                 BUG();
 607         }
 608         return;
 609
 610 cleanup:
 611         transport_generic_free_cmd(&cmd->se_cmd, 0);
 612 }
 613
 614 static int uasp_send_status_response(struct usbg_cmd *cmd)
 615 {
 616         struct f_uas *fu = cmd->fu;
 617         struct uas_stream *stream = cmd->stream;
 618         struct sense_iu *iu = &cmd->sense_iu;
 619
 620         iu->tag = cpu_to_be16(cmd->tag);
 621         stream->req_status->complete = uasp_status_data_cmpl;
 622         stream->req_status->context = cmd;
 623         cmd->fu = fu;
 624         uasp_prepare_status(cmd);
 625         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
 626 }
 627
 628 static int uasp_send_read_response(struct usbg_cmd *cmd)
 629 {
 630         struct f_uas *fu = cmd->fu;
 631         struct uas_stream *stream = cmd->stream;
 632         struct sense_iu *iu = &cmd->sense_iu;
 633         int ret;
 634
 635         cmd->fu = fu;
 636
 637         iu->tag = cpu_to_be16(cmd->tag);
 638         if (fu->flags & USBG_USE_STREAMS) {
 639
 640                 ret = uasp_prepare_r_request(cmd);
 641                 if (ret)
 642                         goto out;
 643                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 644                 if (ret) {
 645                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 646                         kfree(cmd->data_buf);
 647                         cmd->data_buf = NULL;
 648                 }
 649
 650         } else {
 651
 652                 iu->iu_id = IU_ID_READ_READY;
 653                 iu->tag = cpu_to_be16(cmd->tag);
 654
 655                 stream->req_status->complete = uasp_status_data_cmpl;
 656                 stream->req_status->context = cmd;
 657
 658                 cmd->state = UASP_SEND_DATA;
 659                 stream->req_status->buf = iu;
 660                 stream->req_status->length = sizeof(struct iu);
 661
 662                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 663                                 GFP_ATOMIC);
 664                 if (ret)
 665                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 666         }
 667 out:
 668         return ret;
 669 }
 670
 671 static int uasp_send_write_request(struct usbg_cmd *cmd)
 672 {
 673         struct f_uas *fu = cmd->fu;
 674         struct se_cmd *se_cmd = &cmd->se_cmd;
 675         struct uas_stream *stream = cmd->stream;
 676         struct sense_iu *iu = &cmd->sense_iu;
 677         int ret;
 678
 679         init_completion(&cmd->write_complete);
 680         cmd->fu = fu;
 681
 682         iu->tag = cpu_to_be16(cmd->tag);
 683
 684         if (fu->flags & USBG_USE_STREAMS) {
 685
 686                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 687                 if (ret)
 688                         goto cleanup;
 689                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 690                 if (ret)
 691                         pr_err("%s(%d)\n", __func__, __LINE__);
 692
 693         } else {
 694
 695                 iu->iu_id = IU_ID_WRITE_READY;
 696                 iu->tag = cpu_to_be16(cmd->tag);
 697
 698                 stream->req_status->complete = uasp_status_data_cmpl;
 699                 stream->req_status->context = cmd;
 700
 701                 cmd->state = UASP_RECEIVE_DATA;
 702                 stream->req_status->buf = iu;
 703                 stream->req_status->length = sizeof(struct iu);
 704
 705                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 706                                 GFP_ATOMIC);
 707                 if (ret)
 708                         pr_err("%s(%d)\n", __func__, __LINE__);
 709         }
 710
 711         wait_for_completion(&cmd->write_complete);
 712         target_execute_cmd(se_cmd);
 713 cleanup:
 714         return ret;
 715 }
 716
 717 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
 718
 719 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 720 {
 721         struct f_uas *fu = req->context;
 722         int ret;
 723
 724         if (req->status < 0)
 725                 return;
 726
 727         ret = usbg_submit_command(fu, req->buf, req->actual);
 728         /*
 729          * Once we tune for performance enqueue the command req here again so
 730          * we can receive a second command while we processing this one. Pay
 731          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
 732          * don't break HS.
 733          */
 734         if (!ret)
 735                 return;
 736         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 737 }
 738
 739 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
 740 {
 741         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 742         if (!stream->req_in)
 743                 goto out;
 744
 745         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 746         if (!stream->req_out)
 747                 goto err_out;
 748
 749         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
 750         if (!stream->req_status)
 751                 goto err_sts;
 752
 753         return 0;
 754 err_sts:
 755         usb_ep_free_request(fu->ep_status, stream->req_status);
 756         stream->req_status = NULL;
 757 err_out:
 758         usb_ep_free_request(fu->ep_out, stream->req_out);
 759         stream->req_out = NULL;
 760 out:
 761         return -ENOMEM;
 762 }
 763
 764 static int uasp_alloc_cmd(struct f_uas *fu)
 765 {
 766         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 767         if (!fu->cmd.req)
 768                 goto err;
 769
 770         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 771         if (!fu->cmd.buf)
 772                 goto err_buf;
 773
 774         fu->cmd.req->complete = uasp_cmd_complete;
 775         fu->cmd.req->buf = fu->cmd.buf;
 776         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 777         fu->cmd.req->context = fu;
 778         return 0;
 779
 780 err_buf:
 781         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 782 err:
 783         return -ENOMEM;
 784 }
 785
 786 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 787 {
 788         int i;
 789
 790         for (i = 0; i < max_streams; i++) {
 791                 struct uas_stream *s = &fu->stream[i];
 792
 793                 s->req_in->stream_id = i + 1;
 794                 s->req_out->stream_id = i + 1;
 795                 s->req_status->stream_id = i + 1;
 796         }
 797 }
 798
 799 static int uasp_prepare_reqs(struct f_uas *fu)
 800 {
 801         int ret;
 802         int i;
 803         int max_streams;
 804
 805         if (fu->flags & USBG_USE_STREAMS)
 806                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 807         else
 808                 max_streams = 1;
 809
 810         for (i = 0; i < max_streams; i++) {
 811                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 812                 if (ret)
 813                         goto err_cleanup;
 814         }
 815
 816         ret = uasp_alloc_cmd(fu);
 817         if (ret)
 818                 goto err_free_stream;
 819         uasp_setup_stream_res(fu, max_streams);
 820
 821         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 822         if (ret)
 823                 goto err_free_stream;
 824
 825         return 0;
 826
 827 err_free_stream:
 828         uasp_free_cmdreq(fu);
 829
 830 err_cleanup:
 831         if (i) {
 832                 do {
 833                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 834                         i--;
 835                 } while (i);
 836         }
 837         pr_err("UASP: endpoint setup failed\n");
 838         return ret;
 839 }
 840
 841 static void uasp_set_alt(struct f_uas *fu)
 842 {
 843         struct usb_function *f = &fu->function;
 844         struct usb_gadget *gadget = f->config->cdev->gadget;
 845         int ret;
 846
 847         fu->flags = USBG_IS_UAS;
 848
 849         if (gadget->speed == USB_SPEED_SUPER)
 850                 fu->flags |= USBG_USE_STREAMS;
 851
 852         config_ep_by_speed(gadget, f, fu->ep_in);
 853         ret = usb_ep_enable(fu->ep_in);
 854         if (ret)
 855                 goto err_b_in;
 856
 857         config_ep_by_speed(gadget, f, fu->ep_out);
 858         ret = usb_ep_enable(fu->ep_out);
 859         if (ret)
 860                 goto err_b_out;
 861
 862         config_ep_by_speed(gadget, f, fu->ep_cmd);
 863         ret = usb_ep_enable(fu->ep_cmd);
 864         if (ret)
 865                 goto err_cmd;
 866         config_ep_by_speed(gadget, f, fu->ep_status);
 867         ret = usb_ep_enable(fu->ep_status);
 868         if (ret)
 869                 goto err_status;
 870
 871         ret = uasp_prepare_reqs(fu);
 872         if (ret)
 873                 goto err_wq;
 874         fu->flags |= USBG_ENABLED;
 875
 876         pr_info("Using the UAS protocol\n");
 877         return;
 878 err_wq:
 879         usb_ep_disable(fu->ep_status);
 880 err_status:
 881         usb_ep_disable(fu->ep_cmd);
 882 err_cmd:
 883         usb_ep_disable(fu->ep_out);
 884 err_b_out:
 885         usb_ep_disable(fu->ep_in);
 886 err_b_in:
 887         fu->flags = 0;
 888 }
 889
 890 static int get_cmd_dir(const unsigned char *cdb)
 891 {
 892         int ret;
 893
 894         switch (cdb[0]) {
 895         case READ_6:
 896         case READ_10:
 897         case READ_12:
 898         case READ_16:
 899         case INQUIRY:
 900         case MODE_SENSE:
 901         case MODE_SENSE_10:
 902         case SERVICE_ACTION_IN_16:
 903         case MAINTENANCE_IN:
 904         case PERSISTENT_RESERVE_IN:
 905         case SECURITY_PROTOCOL_IN:
 906         case ACCESS_CONTROL_IN:
 907         case REPORT_LUNS:
 908         case READ_BLOCK_LIMITS:
 909         case READ_POSITION:
 910         case READ_CAPACITY:
 911         case READ_TOC:
 912         case READ_FORMAT_CAPACITIES:
 913         case REQUEST_SENSE:
 914                 ret = DMA_FROM_DEVICE;
 915                 break;
 916
 917         case WRITE_6:
 918         case WRITE_10:
 919         case WRITE_12:
 920         case WRITE_16:
 921         case MODE_SELECT:
 922         case MODE_SELECT_10:
 923         case WRITE_VERIFY:
 924         case WRITE_VERIFY_12:
 925         case PERSISTENT_RESERVE_OUT:
 926         case MAINTENANCE_OUT:
 927         case SECURITY_PROTOCOL_OUT:
 928         case ACCESS_CONTROL_OUT:
 929                 ret = DMA_TO_DEVICE;
 930                 break;
 931         case ALLOW_MEDIUM_REMOVAL:
 932         case TEST_UNIT_READY:
 933         case SYNCHRONIZE_CACHE:
 934         case START_STOP:
 935         case ERASE:
 936         case REZERO_UNIT:
 937         case SEEK_10:
 938         case SPACE:
 939         case VERIFY:
 940         case WRITE_FILEMARKS:
 941                 ret = DMA_NONE;
 942                 break;
 943         default:
 944 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
 945                 pr_warn(CMD_DIR_MSG, cdb[0]);
 946 #undef CMD_DIR_MSG
 947                 ret = -EINVAL;
 948         }
 949         return ret;
 950 }
 951
 952 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 953 {
 954         struct usbg_cmd *cmd = req->context;
 955         struct se_cmd *se_cmd = &cmd->se_cmd;
 956
 957         if (req->status < 0) {
 958                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 959                 goto cleanup;
 960         }
 961
 962         if (req->num_sgs == 0) {
 963                 sg_copy_from_buffer(se_cmd->t_data_sg,
 964                                 se_cmd->t_data_nents,
 965                                 cmd->data_buf,
 966                                 se_cmd->data_length);
 967         }
 968
 969         complete(&cmd->write_complete);
 970         return;
 971
 972 cleanup:
 973         transport_generic_free_cmd(&cmd->se_cmd, 0);
 974 }
 975
 976 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 977 {
 978         struct se_cmd *se_cmd = &cmd->se_cmd;
 979         struct f_uas *fu = cmd->fu;
 980         struct usb_gadget *gadget = fuas_to_gadget(fu);
 981
 982         if (!gadget->sg_supported) {
 983                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 984                 if (!cmd->data_buf)
 985                         return -ENOMEM;
 986
 987                 req->buf = cmd->data_buf;
 988         } else {
 989                 req->buf = NULL;
 990                 req->num_sgs = se_cmd->t_data_nents;
 991                 req->sg = se_cmd->t_data_sg;
 992         }
 993
 994         req->complete = usbg_data_write_cmpl;
 995         req->length = se_cmd->data_length;
 996         req->context = cmd;
 997         return 0;
 998 }
 999
1000 static int usbg_send_status_response(struct se_cmd *se_cmd)
1001 {
1002         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1003                         se_cmd);
1004         struct f_uas *fu = cmd->fu;
1005
1006         if (fu->flags & USBG_IS_BOT)
1007                 return bot_send_status_response(cmd);
1008         else
1009                 return uasp_send_status_response(cmd);
1010 }
1011
1012 static int usbg_send_write_request(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_write_request(cmd);
1020         else
1021                 return uasp_send_write_request(cmd);
1022 }
1023
1024 static int usbg_send_read_response(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_read_response(cmd);
1032         else
1033                 return uasp_send_read_response(cmd);
1034 }
1035
1036 static void usbg_cmd_work(struct work_struct *work)
1037 {
1038         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1039         struct se_cmd *se_cmd;
1040         struct tcm_usbg_nexus *tv_nexus;
1041         struct usbg_tpg *tpg;
1042         int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1043
1044         se_cmd = &cmd->se_cmd;
1045         tpg = cmd->fu->tpg;
1046         tv_nexus = tpg->tpg_nexus;
1047         dir = get_cmd_dir(cmd->cmd_buf);
1048         if (dir < 0) {
1049                 transport_init_se_cmd(se_cmd,
1050                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1051                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1052                                 cmd->prio_attr, cmd->sense_iu.sense);
1053                 goto out;
1054         }
1055
1056         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1057                               cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1058                               cmd->prio_attr, dir, flags) < 0)
1059                 goto out;
1060
1061         return;
1062
1063 out:
1064         transport_send_check_condition_and_sense(se_cmd,
1065                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1066         transport_generic_free_cmd(&cmd->se_cmd, 0);
1067 }
1068
1069 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1070                 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1071 {
1072         struct se_session *se_sess = tv_nexus->tvn_se_sess;
1073         struct usbg_cmd *cmd;
1074         int tag, cpu;
1075
1076         tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1077         if (tag < 0)
1078                 return ERR_PTR(-ENOMEM);
1079
1080         cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1081         memset(cmd, 0, sizeof(*cmd));
1082         cmd->se_cmd.map_tag = tag;
1083         cmd->se_cmd.map_cpu = cpu;
1084         cmd->se_cmd.tag = cmd->tag = scsi_tag;
1085         cmd->fu = fu;
1086
1087         return cmd;
1088 }
1089
1090 static void usbg_release_cmd(struct se_cmd *);
1091
1092 static int usbg_submit_command(struct f_uas *fu,
1093                 void *cmdbuf, unsigned int len)
1094 {
1095         struct command_iu *cmd_iu = cmdbuf;
1096         struct usbg_cmd *cmd;
1097         struct usbg_tpg *tpg = fu->tpg;
1098         struct tcm_usbg_nexus *tv_nexus;
1099         u32 cmd_len;
1100         u16 scsi_tag;
1101
1102         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1103                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1104                 return -EINVAL;
1105         }
1106
1107         tv_nexus = tpg->tpg_nexus;
1108         if (!tv_nexus) {
1109                 pr_err("Missing nexus, ignoring command\n");
1110                 return -EINVAL;
1111         }
1112
1113         cmd_len = (cmd_iu->len & ~0x3) + 16;
1114         if (cmd_len > USBG_MAX_CMD)
1115                 return -EINVAL;
1116
1117         scsi_tag = be16_to_cpup(&cmd_iu->tag);
1118         cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1119         if (IS_ERR(cmd)) {
1120                 pr_err("usbg_get_cmd failed\n");
1121                 return -ENOMEM;
1122         }
1123         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1124
1125         if (fu->flags & USBG_USE_STREAMS) {
1126                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1127                         goto err;
1128                 if (!cmd->tag)
1129                         cmd->stream = &fu->stream[0];
1130                 else
1131                         cmd->stream = &fu->stream[cmd->tag - 1];
1132         } else {
1133                 cmd->stream = &fu->stream[0];
1134         }
1135
1136         switch (cmd_iu->prio_attr & 0x7) {
1137         case UAS_HEAD_TAG:
1138                 cmd->prio_attr = TCM_HEAD_TAG;
1139                 break;
1140         case UAS_ORDERED_TAG:
1141                 cmd->prio_attr = TCM_ORDERED_TAG;
1142                 break;
1143         case UAS_ACA:
1144                 cmd->prio_attr = TCM_ACA_TAG;
1145                 break;
1146         default:
1147                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1148                                 cmd_iu->prio_attr);
1149                 /* fall through */
1150         case UAS_SIMPLE_TAG:
1151                 cmd->prio_attr = TCM_SIMPLE_TAG;
1152                 break;
1153         }
1154
1155         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1156
1157         INIT_WORK(&cmd->work, usbg_cmd_work);
1158         queue_work(tpg->workqueue, &cmd->work);
1159
1160         return 0;
1161 err:
1162         usbg_release_cmd(&cmd->se_cmd);
1163         return -EINVAL;
1164 }
1165
1166 static void bot_cmd_work(struct work_struct *work)
1167 {
1168         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1169         struct se_cmd *se_cmd;
1170         struct tcm_usbg_nexus *tv_nexus;
1171         struct usbg_tpg *tpg;
1172         int dir;
1173
1174         se_cmd = &cmd->se_cmd;
1175         tpg = cmd->fu->tpg;
1176         tv_nexus = tpg->tpg_nexus;
1177         dir = get_cmd_dir(cmd->cmd_buf);
1178         if (dir < 0) {
1179                 transport_init_se_cmd(se_cmd,
1180                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1181                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1182                                 cmd->prio_attr, cmd->sense_iu.sense);
1183                 goto out;
1184         }
1185
1186         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1187                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1188                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1189                 goto out;
1190
1191         return;
1192
1193 out:
1194         transport_send_check_condition_and_sense(se_cmd,
1195                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1196         transport_generic_free_cmd(&cmd->se_cmd, 0);
1197 }
1198
1199 static int bot_submit_command(struct f_uas *fu,
1200                 void *cmdbuf, unsigned int len)
1201 {
1202         struct bulk_cb_wrap *cbw = cmdbuf;
1203         struct usbg_cmd *cmd;
1204         struct usbg_tpg *tpg = fu->tpg;
1205         struct tcm_usbg_nexus *tv_nexus;
1206         u32 cmd_len;
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         tv_nexus = tpg->tpg_nexus;
1222         if (!tv_nexus) {
1223                 pr_err("Missing nexus, ignoring command\n");
1224                 return -ENODEV;
1225         }
1226
1227         cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1228         if (IS_ERR(cmd)) {
1229                 pr_err("usbg_get_cmd failed\n");
1230                 return -ENOMEM;
1231         }
1232         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1233
1234         cmd->bot_tag = cbw->Tag;
1235         cmd->prio_attr = TCM_SIMPLE_TAG;
1236         cmd->unpacked_lun = cbw->Lun;
1237         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1238         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1239         cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1240
1241         INIT_WORK(&cmd->work, bot_cmd_work);
1242         queue_work(tpg->workqueue, &cmd->work);
1243
1244         return 0;
1245 }
1246
1247 /* Start fabric.c code */
1248
1249 static int usbg_check_true(struct se_portal_group *se_tpg)
1250 {
1251         return 1;
1252 }
1253
1254 static int usbg_check_false(struct se_portal_group *se_tpg)
1255 {
1256         return 0;
1257 }
1258
1259 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1260 {
1261         struct usbg_tpg *tpg = container_of(se_tpg,
1262                                 struct usbg_tpg, se_tpg);
1263         struct usbg_tport *tport = tpg->tport;
1264
1265         return &tport->tport_name[0];
1266 }
1267
1268 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1269 {
1270         struct usbg_tpg *tpg = container_of(se_tpg,
1271                                 struct usbg_tpg, se_tpg);
1272         return tpg->tport_tpgt;
1273 }
1274
1275 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1276 {
1277         return 1;
1278 }
1279
1280 static void usbg_release_cmd(struct se_cmd *se_cmd)
1281 {
1282         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1283                         se_cmd);
1284         struct se_session *se_sess = se_cmd->se_sess;
1285
1286         kfree(cmd->data_buf);
1287         target_free_tag(se_sess, se_cmd);
1288 }
1289
1290 static u32 usbg_sess_get_index(struct se_session *se_sess)
1291 {
1292         return 0;
1293 }
1294
1295 /*
1296  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1297  */
1298 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1299 {
1300         return 0;
1301 }
1302
1303 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1304 {
1305 }
1306
1307 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1308 {
1309         return 0;
1310 }
1311
1312 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1313 {
1314 }
1315
1316 static void usbg_aborted_task(struct se_cmd *se_cmd)
1317 {
1318 }
1319
1320 static const char *usbg_check_wwn(const char *name)
1321 {
1322         const char *n;
1323         unsigned int len;
1324
1325         n = strstr(name, "naa.");
1326         if (!n)
1327                 return NULL;
1328         n += 4;
1329         len = strlen(n);
1330         if (len == 0 || len > USBG_NAMELEN - 1)
1331                 return NULL;
1332         return n;
1333 }
1334
1335 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1336 {
1337         if (!usbg_check_wwn(name))
1338                 return -EINVAL;
1339         return 0;
1340 }
1341
1342 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1343                                              const char *name)
1344 {
1345         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1346                         tport_wwn);
1347         struct usbg_tpg *tpg;
1348         unsigned long tpgt;
1349         int ret;
1350         struct f_tcm_opts *opts;
1351         unsigned i;
1352
1353         if (strstr(name, "tpgt_") != name)
1354                 return ERR_PTR(-EINVAL);
1355         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1356                 return ERR_PTR(-EINVAL);
1357         ret = -ENODEV;
1358         mutex_lock(&tpg_instances_lock);
1359         for (i = 0; i < TPG_INSTANCES; ++i)
1360                 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1361                         break;
1362         if (i == TPG_INSTANCES)
1363                 goto unlock_inst;
1364
1365         opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1366                 func_inst);
1367         mutex_lock(&opts->dep_lock);
1368         if (!opts->ready)
1369                 goto unlock_dep;
1370
1371         if (opts->has_dep) {
1372                 if (!try_module_get(opts->dependent))
1373                         goto unlock_dep;
1374         } else {
1375                 ret = configfs_depend_item_unlocked(
1376                         wwn->wwn_group.cg_subsys,
1377                         &opts->func_inst.group.cg_item);
1378                 if (ret)
1379                         goto unlock_dep;
1380         }
1381
1382         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1383         ret = -ENOMEM;
1384         if (!tpg)
1385                 goto unref_dep;
1386         mutex_init(&tpg->tpg_mutex);
1387         atomic_set(&tpg->tpg_port_count, 0);
1388         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1389         if (!tpg->workqueue)
1390                 goto free_tpg;
1391
1392         tpg->tport = tport;
1393         tpg->tport_tpgt = tpgt;
1394
1395         /*
1396          * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1397          * pretend to be SAS..
1398          */
1399         ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1400         if (ret < 0)
1401                 goto free_workqueue;
1402
1403         tpg_instances[i].tpg = tpg;
1404         tpg->fi = tpg_instances[i].func_inst;
1405         mutex_unlock(&opts->dep_lock);
1406         mutex_unlock(&tpg_instances_lock);
1407         return &tpg->se_tpg;
1408
1409 free_workqueue:
1410         destroy_workqueue(tpg->workqueue);
1411 free_tpg:
1412         kfree(tpg);
1413 unref_dep:
1414         if (opts->has_dep)
1415                 module_put(opts->dependent);
1416         else
1417                 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1418 unlock_dep:
1419         mutex_unlock(&opts->dep_lock);
1420 unlock_inst:
1421         mutex_unlock(&tpg_instances_lock);
1422
1423         return ERR_PTR(ret);
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         unsigned i;
1433         struct f_tcm_opts *opts;
1434
1435         tcm_usbg_drop_nexus(tpg);
1436         core_tpg_deregister(se_tpg);
1437         destroy_workqueue(tpg->workqueue);
1438
1439         mutex_lock(&tpg_instances_lock);
1440         for (i = 0; i < TPG_INSTANCES; ++i)
1441                 if (tpg_instances[i].tpg == tpg)
1442                         break;
1443         if (i < TPG_INSTANCES) {
1444                 tpg_instances[i].tpg = NULL;
1445                 opts = container_of(tpg_instances[i].func_inst,
1446                         struct f_tcm_opts, func_inst);
1447                 mutex_lock(&opts->dep_lock);
1448                 if (opts->has_dep)
1449                         module_put(opts->dependent);
1450                 else
1451                         configfs_undepend_item_unlocked(
1452                                 &opts->func_inst.group.cg_item);
1453                 mutex_unlock(&opts->dep_lock);
1454         }
1455         mutex_unlock(&tpg_instances_lock);
1456
1457         kfree(tpg);
1458 }
1459
1460 static struct se_wwn *usbg_make_tport(
1461         struct target_fabric_configfs *tf,
1462         struct config_group *group,
1463         const char *name)
1464 {
1465         struct usbg_tport *tport;
1466         const char *wnn_name;
1467         u64 wwpn = 0;
1468
1469         wnn_name = usbg_check_wwn(name);
1470         if (!wnn_name)
1471                 return ERR_PTR(-EINVAL);
1472
1473         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1474         if (!(tport))
1475                 return ERR_PTR(-ENOMEM);
1476
1477         tport->tport_wwpn = wwpn;
1478         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1479         return &tport->tport_wwn;
1480 }
1481
1482 static void usbg_drop_tport(struct se_wwn *wwn)
1483 {
1484         struct usbg_tport *tport = container_of(wwn,
1485                                 struct usbg_tport, tport_wwn);
1486         kfree(tport);
1487 }
1488
1489 /*
1490  * If somebody feels like dropping the version property, go ahead.
1491  */
1492 static ssize_t usbg_wwn_version_show(struct config_item *item,  char *page)
1493 {
1494         return sprintf(page, "usb-gadget fabric module\n");
1495 }
1496
1497 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1498
1499 static struct configfs_attribute *usbg_wwn_attrs[] = {
1500         &usbg_wwn_attr_version,
1501         NULL,
1502 };
1503
1504 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1505 {
1506         struct se_portal_group *se_tpg = to_tpg(item);
1507         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1508
1509         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1510 }
1511
1512 static int usbg_attach(struct usbg_tpg *);
1513 static void usbg_detach(struct usbg_tpg *);
1514
1515 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1516                 const char *page, size_t count)
1517 {
1518         struct se_portal_group *se_tpg = to_tpg(item);
1519         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1520         bool op;
1521         ssize_t ret;
1522
1523         ret = strtobool(page, &op);
1524         if (ret)
1525                 return ret;
1526
1527         if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1528                 return -EINVAL;
1529
1530         if (op)
1531                 ret = usbg_attach(tpg);
1532         else
1533                 usbg_detach(tpg);
1534         if (ret)
1535                 return ret;
1536
1537         tpg->gadget_connect = op;
1538
1539         return count;
1540 }
1541
1542 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1543 {
1544         struct se_portal_group *se_tpg = to_tpg(item);
1545         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1546         struct tcm_usbg_nexus *tv_nexus;
1547         ssize_t ret;
1548
1549         mutex_lock(&tpg->tpg_mutex);
1550         tv_nexus = tpg->tpg_nexus;
1551         if (!tv_nexus) {
1552                 ret = -ENODEV;
1553                 goto out;
1554         }
1555         ret = snprintf(page, PAGE_SIZE, "%s\n",
1556                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1557 out:
1558         mutex_unlock(&tpg->tpg_mutex);
1559         return ret;
1560 }
1561
1562 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1563                               struct se_session *se_sess, void *p)
1564 {
1565         struct usbg_tpg *tpg = container_of(se_tpg,
1566                                 struct usbg_tpg, se_tpg);
1567
1568         tpg->tpg_nexus = p;
1569         return 0;
1570 }
1571
1572 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1573 {
1574         struct tcm_usbg_nexus *tv_nexus;
1575         int ret = 0;
1576
1577         mutex_lock(&tpg->tpg_mutex);
1578         if (tpg->tpg_nexus) {
1579                 ret = -EEXIST;
1580                 pr_debug("tpg->tpg_nexus already exists\n");
1581                 goto out_unlock;
1582         }
1583
1584         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1585         if (!tv_nexus) {
1586                 ret = -ENOMEM;
1587                 goto out_unlock;
1588         }
1589
1590         tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1591                                                      USB_G_DEFAULT_SESSION_TAGS,
1592                                                      sizeof(struct usbg_cmd),
1593                                                      TARGET_PROT_NORMAL, name,
1594                                                      tv_nexus, usbg_alloc_sess_cb);
1595         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1596 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1597                 pr_debug(MAKE_NEXUS_MSG, name);
1598 #undef MAKE_NEXUS_MSG
1599                 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1600                 kfree(tv_nexus);
1601         }
1602
1603 out_unlock:
1604         mutex_unlock(&tpg->tpg_mutex);
1605         return ret;
1606 }
1607
1608 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1609 {
1610         struct se_session *se_sess;
1611         struct tcm_usbg_nexus *tv_nexus;
1612         int ret = -ENODEV;
1613
1614         mutex_lock(&tpg->tpg_mutex);
1615         tv_nexus = tpg->tpg_nexus;
1616         if (!tv_nexus)
1617                 goto out;
1618
1619         se_sess = tv_nexus->tvn_se_sess;
1620         if (!se_sess)
1621                 goto out;
1622
1623         if (atomic_read(&tpg->tpg_port_count)) {
1624                 ret = -EPERM;
1625 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1626                 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1627 #undef MSG
1628                 goto out;
1629         }
1630
1631         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1632                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1633         /*
1634          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1635          */
1636         target_remove_session(se_sess);
1637         tpg->tpg_nexus = NULL;
1638
1639         kfree(tv_nexus);
1640         ret = 0;
1641 out:
1642         mutex_unlock(&tpg->tpg_mutex);
1643         return ret;
1644 }
1645
1646 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1647                 const char *page, size_t count)
1648 {
1649         struct se_portal_group *se_tpg = to_tpg(item);
1650         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1651         unsigned char i_port[USBG_NAMELEN], *ptr;
1652         int ret;
1653
1654         if (!strncmp(page, "NULL", 4)) {
1655                 ret = tcm_usbg_drop_nexus(tpg);
1656                 return (!ret) ? count : ret;
1657         }
1658         if (strlen(page) >= USBG_NAMELEN) {
1659
1660 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1661                 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1662 #undef NEXUS_STORE_MSG
1663                 return -EINVAL;
1664         }
1665         snprintf(i_port, USBG_NAMELEN, "%s", page);
1666
1667         ptr = strstr(i_port, "naa.");
1668         if (!ptr) {
1669                 pr_err("Missing 'naa.' prefix\n");
1670                 return -EINVAL;
1671         }
1672
1673         if (i_port[strlen(i_port) - 1] == '\n')
1674                 i_port[strlen(i_port) - 1] = '\0';
1675
1676         ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1677         if (ret < 0)
1678                 return ret;
1679         return count;
1680 }
1681
1682 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1683 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1684
1685 static struct configfs_attribute *usbg_base_attrs[] = {
1686         &tcm_usbg_tpg_attr_enable,
1687         &tcm_usbg_tpg_attr_nexus,
1688         NULL,
1689 };
1690
1691 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1692 {
1693         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1694
1695         atomic_inc(&tpg->tpg_port_count);
1696         smp_mb__after_atomic();
1697         return 0;
1698 }
1699
1700 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1701                 struct se_lun *se_lun)
1702 {
1703         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1704
1705         atomic_dec(&tpg->tpg_port_count);
1706         smp_mb__after_atomic();
1707 }
1708
1709 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1710 {
1711         return target_put_sess_cmd(se_cmd);
1712 }
1713
1714 static const struct target_core_fabric_ops usbg_ops = {
1715         .module                         = THIS_MODULE,
1716         .fabric_name                    = "usb_gadget",
1717         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1718         .tpg_get_tag                    = usbg_get_tag,
1719         .tpg_check_demo_mode            = usbg_check_true,
1720         .tpg_check_demo_mode_cache      = usbg_check_false,
1721         .tpg_check_demo_mode_write_protect = usbg_check_false,
1722         .tpg_check_prod_mode_write_protect = usbg_check_false,
1723         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1724         .release_cmd                    = usbg_release_cmd,
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 static struct usb_string        tcm_us_strings[] = {
1981         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
1982         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
1983         { },
1984 };
1985
1986 static struct usb_gadget_strings tcm_stringtab = {
1987         .language = 0x0409,
1988         .strings = tcm_us_strings,
1989 };
1990
1991 static struct usb_gadget_strings *tcm_strings[] = {
1992         &tcm_stringtab,
1993         NULL,
1994 };
1995
1996 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1997 {
1998         struct f_uas            *fu = to_f_uas(f);
1999         struct usb_string       *us;
2000         struct usb_gadget       *gadget = c->cdev->gadget;
2001         struct usb_ep           *ep;
2002         struct f_tcm_opts       *opts;
2003         int                     iface;
2004         int                     ret;
2005
2006         opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2007
2008         mutex_lock(&opts->dep_lock);
2009         if (!opts->can_attach) {
2010                 mutex_unlock(&opts->dep_lock);
2011                 return -ENODEV;
2012         }
2013         mutex_unlock(&opts->dep_lock);
2014         us = usb_gstrings_attach(c->cdev, tcm_strings,
2015                 ARRAY_SIZE(tcm_us_strings));
2016         if (IS_ERR(us))
2017                 return PTR_ERR(us);
2018         bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2019         uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2020
2021         iface = usb_interface_id(c, f);
2022         if (iface < 0)
2023                 return iface;
2024
2025         bot_intf_desc.bInterfaceNumber = iface;
2026         uasp_intf_desc.bInterfaceNumber = iface;
2027         fu->iface = iface;
2028         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2029                         &uasp_bi_ep_comp_desc);
2030         if (!ep)
2031                 goto ep_fail;
2032
2033         fu->ep_in = ep;
2034
2035         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2036                         &uasp_bo_ep_comp_desc);
2037         if (!ep)
2038                 goto ep_fail;
2039         fu->ep_out = ep;
2040
2041         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2042                         &uasp_status_in_ep_comp_desc);
2043         if (!ep)
2044                 goto ep_fail;
2045         fu->ep_status = ep;
2046
2047         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2048                         &uasp_cmd_comp_desc);
2049         if (!ep)
2050                 goto ep_fail;
2051         fu->ep_cmd = ep;
2052
2053         /* Assume endpoint addresses are the same for both speeds */
2054         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2055         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2056         uasp_status_desc.bEndpointAddress =
2057                 uasp_ss_status_desc.bEndpointAddress;
2058         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2059
2060         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2061         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2062         uasp_fs_status_desc.bEndpointAddress =
2063                 uasp_ss_status_desc.bEndpointAddress;
2064         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2065
2066         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2067                         uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2068         if (ret)
2069                 goto ep_fail;
2070
2071         return 0;
2072 ep_fail:
2073         pr_err("Can't claim all required eps\n");
2074
2075         return -ENOTSUPP;
2076 }
2077
2078 struct guas_setup_wq {
2079         struct work_struct work;
2080         struct f_uas *fu;
2081         unsigned int alt;
2082 };
2083
2084 static void tcm_delayed_set_alt(struct work_struct *wq)
2085 {
2086         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2087                         work);
2088         struct f_uas *fu = work->fu;
2089         int alt = work->alt;
2090
2091         kfree(work);
2092
2093         if (fu->flags & USBG_IS_BOT)
2094                 bot_cleanup_old_alt(fu);
2095         if (fu->flags & USBG_IS_UAS)
2096                 uasp_cleanup_old_alt(fu);
2097
2098         if (alt == USB_G_ALT_INT_BBB)
2099                 bot_set_alt(fu);
2100         else if (alt == USB_G_ALT_INT_UAS)
2101                 uasp_set_alt(fu);
2102         usb_composite_setup_continue(fu->function.config->cdev);
2103 }
2104
2105 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2106 {
2107         struct f_uas *fu = to_f_uas(f);
2108
2109         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2110                 struct guas_setup_wq *work;
2111
2112                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2113                 if (!work)
2114                         return -ENOMEM;
2115                 INIT_WORK(&work->work, tcm_delayed_set_alt);
2116                 work->fu = fu;
2117                 work->alt = alt;
2118                 schedule_work(&work->work);
2119                 return USB_GADGET_DELAYED_STATUS;
2120         }
2121         return -EOPNOTSUPP;
2122 }
2123
2124 static void tcm_disable(struct usb_function *f)
2125 {
2126         struct f_uas *fu = to_f_uas(f);
2127
2128         if (fu->flags & USBG_IS_UAS)
2129                 uasp_cleanup_old_alt(fu);
2130         else if (fu->flags & USBG_IS_BOT)
2131                 bot_cleanup_old_alt(fu);
2132         fu->flags = 0;
2133 }
2134
2135 static int tcm_setup(struct usb_function *f,
2136                 const struct usb_ctrlrequest *ctrl)
2137 {
2138         struct f_uas *fu = to_f_uas(f);
2139
2140         if (!(fu->flags & USBG_IS_BOT))
2141                 return -EOPNOTSUPP;
2142
2143         return usbg_bot_setup(f, ctrl);
2144 }
2145
2146 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2147 {
2148         return container_of(to_config_group(item), struct f_tcm_opts,
2149                 func_inst.group);
2150 }
2151
2152 static void tcm_attr_release(struct config_item *item)
2153 {
2154         struct f_tcm_opts *opts = to_f_tcm_opts(item);
2155
2156         usb_put_function_instance(&opts->func_inst);
2157 }
2158
2159 static struct configfs_item_operations tcm_item_ops = {
2160         .release                = tcm_attr_release,
2161 };
2162
2163 static const struct config_item_type tcm_func_type = {
2164         .ct_item_ops    = &tcm_item_ops,
2165         .ct_owner       = THIS_MODULE,
2166 };
2167
2168 static void tcm_free_inst(struct usb_function_instance *f)
2169 {
2170         struct f_tcm_opts *opts;
2171         unsigned i;
2172
2173         opts = container_of(f, struct f_tcm_opts, func_inst);
2174
2175         mutex_lock(&tpg_instances_lock);
2176         for (i = 0; i < TPG_INSTANCES; ++i)
2177                 if (tpg_instances[i].func_inst == f)
2178                         break;
2179         if (i < TPG_INSTANCES)
2180                 tpg_instances[i].func_inst = NULL;
2181         mutex_unlock(&tpg_instances_lock);
2182
2183         kfree(opts);
2184 }
2185
2186 static int tcm_register_callback(struct usb_function_instance *f)
2187 {
2188         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2189
2190         mutex_lock(&opts->dep_lock);
2191         opts->can_attach = true;
2192         mutex_unlock(&opts->dep_lock);
2193
2194         return 0;
2195 }
2196
2197 static void tcm_unregister_callback(struct usb_function_instance *f)
2198 {
2199         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2200
2201         mutex_lock(&opts->dep_lock);
2202         unregister_gadget_item(opts->
2203                 func_inst.group.cg_item.ci_parent->ci_parent);
2204         opts->can_attach = false;
2205         mutex_unlock(&opts->dep_lock);
2206 }
2207
2208 static int usbg_attach(struct usbg_tpg *tpg)
2209 {
2210         struct usb_function_instance *f = tpg->fi;
2211         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2212
2213         if (opts->tcm_register_callback)
2214                 return opts->tcm_register_callback(f);
2215
2216         return 0;
2217 }
2218
2219 static void usbg_detach(struct usbg_tpg *tpg)
2220 {
2221         struct usb_function_instance *f = tpg->fi;
2222         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2223
2224         if (opts->tcm_unregister_callback)
2225                 opts->tcm_unregister_callback(f);
2226 }
2227
2228 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2229 {
2230         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2231
2232         pr_debug("tcm: Activating %s\n", name);
2233
2234         mutex_lock(&opts->dep_lock);
2235         opts->ready = true;
2236         mutex_unlock(&opts->dep_lock);
2237
2238         return 0;
2239 }
2240
2241 static struct usb_function_instance *tcm_alloc_inst(void)
2242 {
2243         struct f_tcm_opts *opts;
2244         int i;
2245
2246
2247         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2248         if (!opts)
2249                 return ERR_PTR(-ENOMEM);
2250
2251         mutex_lock(&tpg_instances_lock);
2252         for (i = 0; i < TPG_INSTANCES; ++i)
2253                 if (!tpg_instances[i].func_inst)
2254                         break;
2255
2256         if (i == TPG_INSTANCES) {
2257                 mutex_unlock(&tpg_instances_lock);
2258                 kfree(opts);
2259                 return ERR_PTR(-EBUSY);
2260         }
2261         tpg_instances[i].func_inst = &opts->func_inst;
2262         mutex_unlock(&tpg_instances_lock);
2263
2264         mutex_init(&opts->dep_lock);
2265         opts->func_inst.set_inst_name = tcm_set_name;
2266         opts->func_inst.free_func_inst = tcm_free_inst;
2267         opts->tcm_register_callback = tcm_register_callback;
2268         opts->tcm_unregister_callback = tcm_unregister_callback;
2269
2270         config_group_init_type_name(&opts->func_inst.group, "",
2271                         &tcm_func_type);
2272
2273         return &opts->func_inst;
2274 }
2275
2276 static void tcm_free(struct usb_function *f)
2277 {
2278         struct f_uas *tcm = to_f_uas(f);
2279
2280         kfree(tcm);
2281 }
2282
2283 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2284 {
2285         usb_free_all_descriptors(f);
2286 }
2287
2288 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2289 {
2290         struct f_uas *fu;
2291         unsigned i;
2292
2293         mutex_lock(&tpg_instances_lock);
2294         for (i = 0; i < TPG_INSTANCES; ++i)
2295                 if (tpg_instances[i].func_inst == fi)
2296                         break;
2297         if (i == TPG_INSTANCES) {
2298                 mutex_unlock(&tpg_instances_lock);
2299                 return ERR_PTR(-ENODEV);
2300         }
2301
2302         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2303         if (!fu) {
2304                 mutex_unlock(&tpg_instances_lock);
2305                 return ERR_PTR(-ENOMEM);
2306         }
2307
2308         fu->function.name = "Target Function";
2309         fu->function.bind = tcm_bind;
2310         fu->function.unbind = tcm_unbind;
2311         fu->function.set_alt = tcm_set_alt;
2312         fu->function.setup = tcm_setup;
2313         fu->function.disable = tcm_disable;
2314         fu->function.free_func = tcm_free;
2315         fu->tpg = tpg_instances[i].tpg;
2316         mutex_unlock(&tpg_instances_lock);
2317
2318         return &fu->function;
2319 }
2320
2321 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2322
2323 static int tcm_init(void)
2324 {
2325         int ret;
2326
2327         ret = usb_function_register(&tcmusb_func);
2328         if (ret)
2329                 return ret;
2330
2331         ret = target_register_template(&usbg_ops);
2332         if (ret)
2333                 usb_function_unregister(&tcmusb_func);
2334
2335         return ret;
2336 }
2337 module_init(tcm_init);
2338
2339 static void tcm_exit(void)
2340 {
2341         target_unregister_template(&usbg_ops);
2342         usb_function_unregister(&tcmusb_func);
2343 }
2344 module_exit(tcm_exit);
2345
2346 MODULE_LICENSE("GPL");
2347 MODULE_AUTHOR("Sebastian Andrzej Siewior");