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->is_last = 1;
 535         stream->req_in->complete = uasp_status_data_cmpl;
 536         stream->req_in->length = se_cmd->data_length;
 537         stream->req_in->context = cmd;
 538
 539         cmd->state = UASP_SEND_STATUS;
 540         return 0;
 541 }
 542
 543 static void uasp_prepare_status(struct usbg_cmd *cmd)
 544 {
 545         struct se_cmd *se_cmd = &cmd->se_cmd;
 546         struct sense_iu *iu = &cmd->sense_iu;
 547         struct uas_stream *stream = cmd->stream;
 548
 549         cmd->state = UASP_QUEUE_COMMAND;
 550         iu->iu_id = IU_ID_STATUS;
 551         iu->tag = cpu_to_be16(cmd->tag);
 552
 553         /*
 554          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
 555          */
 556         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
 557         iu->status = se_cmd->scsi_status;
 558         stream->req_status->is_last = 1;
 559         stream->req_status->context = cmd;
 560         stream->req_status->length = se_cmd->scsi_sense_length + 16;
 561         stream->req_status->buf = iu;
 562         stream->req_status->complete = uasp_status_data_cmpl;
 563 }
 564
 565 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
 566 {
 567         struct usbg_cmd *cmd = req->context;
 568         struct uas_stream *stream = cmd->stream;
 569         struct f_uas *fu = cmd->fu;
 570         int ret;
 571
 572         if (req->status < 0)
 573                 goto cleanup;
 574
 575         switch (cmd->state) {
 576         case UASP_SEND_DATA:
 577                 ret = uasp_prepare_r_request(cmd);
 578                 if (ret)
 579                         goto cleanup;
 580                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 581                 if (ret)
 582                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 583                 break;
 584
 585         case UASP_RECEIVE_DATA:
 586                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 587                 if (ret)
 588                         goto cleanup;
 589                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 590                 if (ret)
 591                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 592                 break;
 593
 594         case UASP_SEND_STATUS:
 595                 uasp_prepare_status(cmd);
 596                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 597                                 GFP_ATOMIC);
 598                 if (ret)
 599                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 600                 break;
 601
 602         case UASP_QUEUE_COMMAND:
 603                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 604                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 605                 break;
 606
 607         default:
 608                 BUG();
 609         }
 610         return;
 611
 612 cleanup:
 613         transport_generic_free_cmd(&cmd->se_cmd, 0);
 614 }
 615
 616 static int uasp_send_status_response(struct usbg_cmd *cmd)
 617 {
 618         struct f_uas *fu = cmd->fu;
 619         struct uas_stream *stream = cmd->stream;
 620         struct sense_iu *iu = &cmd->sense_iu;
 621
 622         iu->tag = cpu_to_be16(cmd->tag);
 623         stream->req_status->complete = uasp_status_data_cmpl;
 624         stream->req_status->context = cmd;
 625         cmd->fu = fu;
 626         uasp_prepare_status(cmd);
 627         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
 628 }
 629
 630 static int uasp_send_read_response(struct usbg_cmd *cmd)
 631 {
 632         struct f_uas *fu = cmd->fu;
 633         struct uas_stream *stream = cmd->stream;
 634         struct sense_iu *iu = &cmd->sense_iu;
 635         int ret;
 636
 637         cmd->fu = fu;
 638
 639         iu->tag = cpu_to_be16(cmd->tag);
 640         if (fu->flags & USBG_USE_STREAMS) {
 641
 642                 ret = uasp_prepare_r_request(cmd);
 643                 if (ret)
 644                         goto out;
 645                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 646                 if (ret) {
 647                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 648                         kfree(cmd->data_buf);
 649                         cmd->data_buf = NULL;
 650                 }
 651
 652         } else {
 653
 654                 iu->iu_id = IU_ID_READ_READY;
 655                 iu->tag = cpu_to_be16(cmd->tag);
 656
 657                 stream->req_status->complete = uasp_status_data_cmpl;
 658                 stream->req_status->context = cmd;
 659
 660                 cmd->state = UASP_SEND_DATA;
 661                 stream->req_status->buf = iu;
 662                 stream->req_status->length = sizeof(struct iu);
 663
 664                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 665                                 GFP_ATOMIC);
 666                 if (ret)
 667                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 668         }
 669 out:
 670         return ret;
 671 }
 672
 673 static int uasp_send_write_request(struct usbg_cmd *cmd)
 674 {
 675         struct f_uas *fu = cmd->fu;
 676         struct se_cmd *se_cmd = &cmd->se_cmd;
 677         struct uas_stream *stream = cmd->stream;
 678         struct sense_iu *iu = &cmd->sense_iu;
 679         int ret;
 680
 681         init_completion(&cmd->write_complete);
 682         cmd->fu = fu;
 683
 684         iu->tag = cpu_to_be16(cmd->tag);
 685
 686         if (fu->flags & USBG_USE_STREAMS) {
 687
 688                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 689                 if (ret)
 690                         goto cleanup;
 691                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 692                 if (ret)
 693                         pr_err("%s(%d)\n", __func__, __LINE__);
 694
 695         } else {
 696
 697                 iu->iu_id = IU_ID_WRITE_READY;
 698                 iu->tag = cpu_to_be16(cmd->tag);
 699
 700                 stream->req_status->complete = uasp_status_data_cmpl;
 701                 stream->req_status->context = cmd;
 702
 703                 cmd->state = UASP_RECEIVE_DATA;
 704                 stream->req_status->buf = iu;
 705                 stream->req_status->length = sizeof(struct iu);
 706
 707                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 708                                 GFP_ATOMIC);
 709                 if (ret)
 710                         pr_err("%s(%d)\n", __func__, __LINE__);
 711         }
 712
 713         wait_for_completion(&cmd->write_complete);
 714         target_execute_cmd(se_cmd);
 715 cleanup:
 716         return ret;
 717 }
 718
 719 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
 720
 721 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 722 {
 723         struct f_uas *fu = req->context;
 724         int ret;
 725
 726         if (req->status < 0)
 727                 return;
 728
 729         ret = usbg_submit_command(fu, req->buf, req->actual);
 730         /*
 731          * Once we tune for performance enqueue the command req here again so
 732          * we can receive a second command while we processing this one. Pay
 733          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
 734          * don't break HS.
 735          */
 736         if (!ret)
 737                 return;
 738         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 739 }
 740
 741 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
 742 {
 743         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 744         if (!stream->req_in)
 745                 goto out;
 746
 747         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 748         if (!stream->req_out)
 749                 goto err_out;
 750
 751         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
 752         if (!stream->req_status)
 753                 goto err_sts;
 754
 755         return 0;
 756 err_sts:
 757         usb_ep_free_request(fu->ep_status, stream->req_status);
 758         stream->req_status = NULL;
 759 err_out:
 760         usb_ep_free_request(fu->ep_out, stream->req_out);
 761         stream->req_out = NULL;
 762 out:
 763         return -ENOMEM;
 764 }
 765
 766 static int uasp_alloc_cmd(struct f_uas *fu)
 767 {
 768         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 769         if (!fu->cmd.req)
 770                 goto err;
 771
 772         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 773         if (!fu->cmd.buf)
 774                 goto err_buf;
 775
 776         fu->cmd.req->complete = uasp_cmd_complete;
 777         fu->cmd.req->buf = fu->cmd.buf;
 778         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 779         fu->cmd.req->context = fu;
 780         return 0;
 781
 782 err_buf:
 783         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 784 err:
 785         return -ENOMEM;
 786 }
 787
 788 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 789 {
 790         int i;
 791
 792         for (i = 0; i < max_streams; i++) {
 793                 struct uas_stream *s = &fu->stream[i];
 794
 795                 s->req_in->stream_id = i + 1;
 796                 s->req_out->stream_id = i + 1;
 797                 s->req_status->stream_id = i + 1;
 798         }
 799 }
 800
 801 static int uasp_prepare_reqs(struct f_uas *fu)
 802 {
 803         int ret;
 804         int i;
 805         int max_streams;
 806
 807         if (fu->flags & USBG_USE_STREAMS)
 808                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 809         else
 810                 max_streams = 1;
 811
 812         for (i = 0; i < max_streams; i++) {
 813                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 814                 if (ret)
 815                         goto err_cleanup;
 816         }
 817
 818         ret = uasp_alloc_cmd(fu);
 819         if (ret)
 820                 goto err_free_stream;
 821         uasp_setup_stream_res(fu, max_streams);
 822
 823         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 824         if (ret)
 825                 goto err_free_stream;
 826
 827         return 0;
 828
 829 err_free_stream:
 830         uasp_free_cmdreq(fu);
 831
 832 err_cleanup:
 833         if (i) {
 834                 do {
 835                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 836                         i--;
 837                 } while (i);
 838         }
 839         pr_err("UASP: endpoint setup failed\n");
 840         return ret;
 841 }
 842
 843 static void uasp_set_alt(struct f_uas *fu)
 844 {
 845         struct usb_function *f = &fu->function;
 846         struct usb_gadget *gadget = f->config->cdev->gadget;
 847         int ret;
 848
 849         fu->flags = USBG_IS_UAS;
 850
 851         if (gadget->speed >= USB_SPEED_SUPER)
 852                 fu->flags |= USBG_USE_STREAMS;
 853
 854         config_ep_by_speed(gadget, f, fu->ep_in);
 855         ret = usb_ep_enable(fu->ep_in);
 856         if (ret)
 857                 goto err_b_in;
 858
 859         config_ep_by_speed(gadget, f, fu->ep_out);
 860         ret = usb_ep_enable(fu->ep_out);
 861         if (ret)
 862                 goto err_b_out;
 863
 864         config_ep_by_speed(gadget, f, fu->ep_cmd);
 865         ret = usb_ep_enable(fu->ep_cmd);
 866         if (ret)
 867                 goto err_cmd;
 868         config_ep_by_speed(gadget, f, fu->ep_status);
 869         ret = usb_ep_enable(fu->ep_status);
 870         if (ret)
 871                 goto err_status;
 872
 873         ret = uasp_prepare_reqs(fu);
 874         if (ret)
 875                 goto err_wq;
 876         fu->flags |= USBG_ENABLED;
 877
 878         pr_info("Using the UAS protocol\n");
 879         return;
 880 err_wq:
 881         usb_ep_disable(fu->ep_status);
 882 err_status:
 883         usb_ep_disable(fu->ep_cmd);
 884 err_cmd:
 885         usb_ep_disable(fu->ep_out);
 886 err_b_out:
 887         usb_ep_disable(fu->ep_in);
 888 err_b_in:
 889         fu->flags = 0;
 890 }
 891
 892 static int get_cmd_dir(const unsigned char *cdb)
 893 {
 894         int ret;
 895
 896         switch (cdb[0]) {
 897         case READ_6:
 898         case READ_10:
 899         case READ_12:
 900         case READ_16:
 901         case INQUIRY:
 902         case MODE_SENSE:
 903         case MODE_SENSE_10:
 904         case SERVICE_ACTION_IN_16:
 905         case MAINTENANCE_IN:
 906         case PERSISTENT_RESERVE_IN:
 907         case SECURITY_PROTOCOL_IN:
 908         case ACCESS_CONTROL_IN:
 909         case REPORT_LUNS:
 910         case READ_BLOCK_LIMITS:
 911         case READ_POSITION:
 912         case READ_CAPACITY:
 913         case READ_TOC:
 914         case READ_FORMAT_CAPACITIES:
 915         case REQUEST_SENSE:
 916                 ret = DMA_FROM_DEVICE;
 917                 break;
 918
 919         case WRITE_6:
 920         case WRITE_10:
 921         case WRITE_12:
 922         case WRITE_16:
 923         case MODE_SELECT:
 924         case MODE_SELECT_10:
 925         case WRITE_VERIFY:
 926         case WRITE_VERIFY_12:
 927         case PERSISTENT_RESERVE_OUT:
 928         case MAINTENANCE_OUT:
 929         case SECURITY_PROTOCOL_OUT:
 930         case ACCESS_CONTROL_OUT:
 931                 ret = DMA_TO_DEVICE;
 932                 break;
 933         case ALLOW_MEDIUM_REMOVAL:
 934         case TEST_UNIT_READY:
 935         case SYNCHRONIZE_CACHE:
 936         case START_STOP:
 937         case ERASE:
 938         case REZERO_UNIT:
 939         case SEEK_10:
 940         case SPACE:
 941         case VERIFY:
 942         case WRITE_FILEMARKS:
 943                 ret = DMA_NONE;
 944                 break;
 945         default:
 946 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
 947                 pr_warn(CMD_DIR_MSG, cdb[0]);
 948 #undef CMD_DIR_MSG
 949                 ret = -EINVAL;
 950         }
 951         return ret;
 952 }
 953
 954 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 955 {
 956         struct usbg_cmd *cmd = req->context;
 957         struct se_cmd *se_cmd = &cmd->se_cmd;
 958
 959         if (req->status < 0) {
 960                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 961                 goto cleanup;
 962         }
 963
 964         if (req->num_sgs == 0) {
 965                 sg_copy_from_buffer(se_cmd->t_data_sg,
 966                                 se_cmd->t_data_nents,
 967                                 cmd->data_buf,
 968                                 se_cmd->data_length);
 969         }
 970
 971         complete(&cmd->write_complete);
 972         return;
 973
 974 cleanup:
 975         transport_generic_free_cmd(&cmd->se_cmd, 0);
 976 }
 977
 978 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 979 {
 980         struct se_cmd *se_cmd = &cmd->se_cmd;
 981         struct f_uas *fu = cmd->fu;
 982         struct usb_gadget *gadget = fuas_to_gadget(fu);
 983
 984         if (!gadget->sg_supported) {
 985                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 986                 if (!cmd->data_buf)
 987                         return -ENOMEM;
 988
 989                 req->buf = cmd->data_buf;
 990         } else {
 991                 req->buf = NULL;
 992                 req->num_sgs = se_cmd->t_data_nents;
 993                 req->sg = se_cmd->t_data_sg;
 994         }
 995
 996         req->is_last = 1;
 997         req->complete = usbg_data_write_cmpl;
 998         req->length = se_cmd->data_length;
 999         req->context = cmd;
1000         return 0;
1001 }
1002
1003 static int usbg_send_status_response(struct se_cmd *se_cmd)
1004 {
1005         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1006                         se_cmd);
1007         struct f_uas *fu = cmd->fu;
1008
1009         if (fu->flags & USBG_IS_BOT)
1010                 return bot_send_status_response(cmd);
1011         else
1012                 return uasp_send_status_response(cmd);
1013 }
1014
1015 static int usbg_send_write_request(struct se_cmd *se_cmd)
1016 {
1017         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1018                         se_cmd);
1019         struct f_uas *fu = cmd->fu;
1020
1021         if (fu->flags & USBG_IS_BOT)
1022                 return bot_send_write_request(cmd);
1023         else
1024                 return uasp_send_write_request(cmd);
1025 }
1026
1027 static int usbg_send_read_response(struct se_cmd *se_cmd)
1028 {
1029         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1030                         se_cmd);
1031         struct f_uas *fu = cmd->fu;
1032
1033         if (fu->flags & USBG_IS_BOT)
1034                 return bot_send_read_response(cmd);
1035         else
1036                 return uasp_send_read_response(cmd);
1037 }
1038
1039 static void usbg_cmd_work(struct work_struct *work)
1040 {
1041         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1042         struct se_cmd *se_cmd;
1043         struct tcm_usbg_nexus *tv_nexus;
1044         struct usbg_tpg *tpg;
1045         int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1046
1047         se_cmd = &cmd->se_cmd;
1048         tpg = cmd->fu->tpg;
1049         tv_nexus = tpg->tpg_nexus;
1050         dir = get_cmd_dir(cmd->cmd_buf);
1051         if (dir < 0) {
1052                 transport_init_se_cmd(se_cmd,
1053                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1054                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1055                                 cmd->prio_attr, cmd->sense_iu.sense,
1056                                 cmd->unpacked_lun);
1057                 goto out;
1058         }
1059
1060         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1061                               cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1062                               cmd->prio_attr, dir, flags) < 0)
1063                 goto out;
1064
1065         return;
1066
1067 out:
1068         transport_send_check_condition_and_sense(se_cmd,
1069                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1070         transport_generic_free_cmd(&cmd->se_cmd, 0);
1071 }
1072
1073 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1074                 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1075 {
1076         struct se_session *se_sess = tv_nexus->tvn_se_sess;
1077         struct usbg_cmd *cmd;
1078         int tag, cpu;
1079
1080         tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1081         if (tag < 0)
1082                 return ERR_PTR(-ENOMEM);
1083
1084         cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1085         memset(cmd, 0, sizeof(*cmd));
1086         cmd->se_cmd.map_tag = tag;
1087         cmd->se_cmd.map_cpu = cpu;
1088         cmd->se_cmd.tag = cmd->tag = scsi_tag;
1089         cmd->fu = fu;
1090
1091         return cmd;
1092 }
1093
1094 static void usbg_release_cmd(struct se_cmd *);
1095
1096 static int usbg_submit_command(struct f_uas *fu,
1097                 void *cmdbuf, unsigned int len)
1098 {
1099         struct command_iu *cmd_iu = cmdbuf;
1100         struct usbg_cmd *cmd;
1101         struct usbg_tpg *tpg = fu->tpg;
1102         struct tcm_usbg_nexus *tv_nexus;
1103         u32 cmd_len;
1104         u16 scsi_tag;
1105
1106         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1107                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1108                 return -EINVAL;
1109         }
1110
1111         tv_nexus = tpg->tpg_nexus;
1112         if (!tv_nexus) {
1113                 pr_err("Missing nexus, ignoring command\n");
1114                 return -EINVAL;
1115         }
1116
1117         cmd_len = (cmd_iu->len & ~0x3) + 16;
1118         if (cmd_len > USBG_MAX_CMD)
1119                 return -EINVAL;
1120
1121         scsi_tag = be16_to_cpup(&cmd_iu->tag);
1122         cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1123         if (IS_ERR(cmd)) {
1124                 pr_err("usbg_get_cmd failed\n");
1125                 return -ENOMEM;
1126         }
1127         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1128
1129         if (fu->flags & USBG_USE_STREAMS) {
1130                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1131                         goto err;
1132                 if (!cmd->tag)
1133                         cmd->stream = &fu->stream[0];
1134                 else
1135                         cmd->stream = &fu->stream[cmd->tag - 1];
1136         } else {
1137                 cmd->stream = &fu->stream[0];
1138         }
1139
1140         switch (cmd_iu->prio_attr & 0x7) {
1141         case UAS_HEAD_TAG:
1142                 cmd->prio_attr = TCM_HEAD_TAG;
1143                 break;
1144         case UAS_ORDERED_TAG:
1145                 cmd->prio_attr = TCM_ORDERED_TAG;
1146                 break;
1147         case UAS_ACA:
1148                 cmd->prio_attr = TCM_ACA_TAG;
1149                 break;
1150         default:
1151                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1152                                 cmd_iu->prio_attr);
1153                 /* fall through */
1154         case UAS_SIMPLE_TAG:
1155                 cmd->prio_attr = TCM_SIMPLE_TAG;
1156                 break;
1157         }
1158
1159         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1160
1161         INIT_WORK(&cmd->work, usbg_cmd_work);
1162         queue_work(tpg->workqueue, &cmd->work);
1163
1164         return 0;
1165 err:
1166         usbg_release_cmd(&cmd->se_cmd);
1167         return -EINVAL;
1168 }
1169
1170 static void bot_cmd_work(struct work_struct *work)
1171 {
1172         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1173         struct se_cmd *se_cmd;
1174         struct tcm_usbg_nexus *tv_nexus;
1175         struct usbg_tpg *tpg;
1176         int dir;
1177
1178         se_cmd = &cmd->se_cmd;
1179         tpg = cmd->fu->tpg;
1180         tv_nexus = tpg->tpg_nexus;
1181         dir = get_cmd_dir(cmd->cmd_buf);
1182         if (dir < 0) {
1183                 transport_init_se_cmd(se_cmd,
1184                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1185                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1186                                 cmd->prio_attr, cmd->sense_iu.sense,
1187                                 cmd->unpacked_lun);
1188                 goto out;
1189         }
1190
1191         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1192                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1193                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1194                 goto out;
1195
1196         return;
1197
1198 out:
1199         transport_send_check_condition_and_sense(se_cmd,
1200                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1201         transport_generic_free_cmd(&cmd->se_cmd, 0);
1202 }
1203
1204 static int bot_submit_command(struct f_uas *fu,
1205                 void *cmdbuf, unsigned int len)
1206 {
1207         struct bulk_cb_wrap *cbw = cmdbuf;
1208         struct usbg_cmd *cmd;
1209         struct usbg_tpg *tpg = fu->tpg;
1210         struct tcm_usbg_nexus *tv_nexus;
1211         u32 cmd_len;
1212
1213         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1214                 pr_err("Wrong signature on CBW\n");
1215                 return -EINVAL;
1216         }
1217         if (len != 31) {
1218                 pr_err("Wrong length for CBW\n");
1219                 return -EINVAL;
1220         }
1221
1222         cmd_len = cbw->Length;
1223         if (cmd_len < 1 || cmd_len > 16)
1224                 return -EINVAL;
1225
1226         tv_nexus = tpg->tpg_nexus;
1227         if (!tv_nexus) {
1228                 pr_err("Missing nexus, ignoring command\n");
1229                 return -ENODEV;
1230         }
1231
1232         cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1233         if (IS_ERR(cmd)) {
1234                 pr_err("usbg_get_cmd failed\n");
1235                 return -ENOMEM;
1236         }
1237         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1238
1239         cmd->bot_tag = cbw->Tag;
1240         cmd->prio_attr = TCM_SIMPLE_TAG;
1241         cmd->unpacked_lun = cbw->Lun;
1242         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1243         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1244         cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1245
1246         INIT_WORK(&cmd->work, bot_cmd_work);
1247         queue_work(tpg->workqueue, &cmd->work);
1248
1249         return 0;
1250 }
1251
1252 /* Start fabric.c code */
1253
1254 static int usbg_check_true(struct se_portal_group *se_tpg)
1255 {
1256         return 1;
1257 }
1258
1259 static int usbg_check_false(struct se_portal_group *se_tpg)
1260 {
1261         return 0;
1262 }
1263
1264 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1265 {
1266         struct usbg_tpg *tpg = container_of(se_tpg,
1267                                 struct usbg_tpg, se_tpg);
1268         struct usbg_tport *tport = tpg->tport;
1269
1270         return &tport->tport_name[0];
1271 }
1272
1273 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1274 {
1275         struct usbg_tpg *tpg = container_of(se_tpg,
1276                                 struct usbg_tpg, se_tpg);
1277         return tpg->tport_tpgt;
1278 }
1279
1280 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1281 {
1282         return 1;
1283 }
1284
1285 static void usbg_release_cmd(struct se_cmd *se_cmd)
1286 {
1287         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1288                         se_cmd);
1289         struct se_session *se_sess = se_cmd->se_sess;
1290
1291         kfree(cmd->data_buf);
1292         target_free_tag(se_sess, se_cmd);
1293 }
1294
1295 static u32 usbg_sess_get_index(struct se_session *se_sess)
1296 {
1297         return 0;
1298 }
1299
1300 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1301 {
1302 }
1303
1304 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1305 {
1306         return 0;
1307 }
1308
1309 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1310 {
1311 }
1312
1313 static void usbg_aborted_task(struct se_cmd *se_cmd)
1314 {
1315 }
1316
1317 static const char *usbg_check_wwn(const char *name)
1318 {
1319         const char *n;
1320         unsigned int len;
1321
1322         n = strstr(name, "naa.");
1323         if (!n)
1324                 return NULL;
1325         n += 4;
1326         len = strlen(n);
1327         if (len == 0 || len > USBG_NAMELEN - 1)
1328                 return NULL;
1329         return n;
1330 }
1331
1332 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1333 {
1334         if (!usbg_check_wwn(name))
1335                 return -EINVAL;
1336         return 0;
1337 }
1338
1339 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1340                                              const char *name)
1341 {
1342         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1343                         tport_wwn);
1344         struct usbg_tpg *tpg;
1345         unsigned long tpgt;
1346         int ret;
1347         struct f_tcm_opts *opts;
1348         unsigned i;
1349
1350         if (strstr(name, "tpgt_") != name)
1351                 return ERR_PTR(-EINVAL);
1352         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1353                 return ERR_PTR(-EINVAL);
1354         ret = -ENODEV;
1355         mutex_lock(&tpg_instances_lock);
1356         for (i = 0; i < TPG_INSTANCES; ++i)
1357                 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1358                         break;
1359         if (i == TPG_INSTANCES)
1360                 goto unlock_inst;
1361
1362         opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1363                 func_inst);
1364         mutex_lock(&opts->dep_lock);
1365         if (!opts->ready)
1366                 goto unlock_dep;
1367
1368         if (opts->has_dep) {
1369                 if (!try_module_get(opts->dependent))
1370                         goto unlock_dep;
1371         } else {
1372                 ret = configfs_depend_item_unlocked(
1373                         wwn->wwn_group.cg_subsys,
1374                         &opts->func_inst.group.cg_item);
1375                 if (ret)
1376                         goto unlock_dep;
1377         }
1378
1379         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1380         ret = -ENOMEM;
1381         if (!tpg)
1382                 goto unref_dep;
1383         mutex_init(&tpg->tpg_mutex);
1384         atomic_set(&tpg->tpg_port_count, 0);
1385         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1386         if (!tpg->workqueue)
1387                 goto free_tpg;
1388
1389         tpg->tport = tport;
1390         tpg->tport_tpgt = tpgt;
1391
1392         /*
1393          * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1394          * pretend to be SAS..
1395          */
1396         ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1397         if (ret < 0)
1398                 goto free_workqueue;
1399
1400         tpg_instances[i].tpg = tpg;
1401         tpg->fi = tpg_instances[i].func_inst;
1402         mutex_unlock(&opts->dep_lock);
1403         mutex_unlock(&tpg_instances_lock);
1404         return &tpg->se_tpg;
1405
1406 free_workqueue:
1407         destroy_workqueue(tpg->workqueue);
1408 free_tpg:
1409         kfree(tpg);
1410 unref_dep:
1411         if (opts->has_dep)
1412                 module_put(opts->dependent);
1413         else
1414                 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1415 unlock_dep:
1416         mutex_unlock(&opts->dep_lock);
1417 unlock_inst:
1418         mutex_unlock(&tpg_instances_lock);
1419
1420         return ERR_PTR(ret);
1421 }
1422
1423 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1424
1425 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1426 {
1427         struct usbg_tpg *tpg = container_of(se_tpg,
1428                                 struct usbg_tpg, se_tpg);
1429         unsigned i;
1430         struct f_tcm_opts *opts;
1431
1432         tcm_usbg_drop_nexus(tpg);
1433         core_tpg_deregister(se_tpg);
1434         destroy_workqueue(tpg->workqueue);
1435
1436         mutex_lock(&tpg_instances_lock);
1437         for (i = 0; i < TPG_INSTANCES; ++i)
1438                 if (tpg_instances[i].tpg == tpg)
1439                         break;
1440         if (i < TPG_INSTANCES) {
1441                 tpg_instances[i].tpg = NULL;
1442                 opts = container_of(tpg_instances[i].func_inst,
1443                         struct f_tcm_opts, func_inst);
1444                 mutex_lock(&opts->dep_lock);
1445                 if (opts->has_dep)
1446                         module_put(opts->dependent);
1447                 else
1448                         configfs_undepend_item_unlocked(
1449                                 &opts->func_inst.group.cg_item);
1450                 mutex_unlock(&opts->dep_lock);
1451         }
1452         mutex_unlock(&tpg_instances_lock);
1453
1454         kfree(tpg);
1455 }
1456
1457 static struct se_wwn *usbg_make_tport(
1458         struct target_fabric_configfs *tf,
1459         struct config_group *group,
1460         const char *name)
1461 {
1462         struct usbg_tport *tport;
1463         const char *wnn_name;
1464         u64 wwpn = 0;
1465
1466         wnn_name = usbg_check_wwn(name);
1467         if (!wnn_name)
1468                 return ERR_PTR(-EINVAL);
1469
1470         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1471         if (!(tport))
1472                 return ERR_PTR(-ENOMEM);
1473
1474         tport->tport_wwpn = wwpn;
1475         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1476         return &tport->tport_wwn;
1477 }
1478
1479 static void usbg_drop_tport(struct se_wwn *wwn)
1480 {
1481         struct usbg_tport *tport = container_of(wwn,
1482                                 struct usbg_tport, tport_wwn);
1483         kfree(tport);
1484 }
1485
1486 /*
1487  * If somebody feels like dropping the version property, go ahead.
1488  */
1489 static ssize_t usbg_wwn_version_show(struct config_item *item,  char *page)
1490 {
1491         return sprintf(page, "usb-gadget fabric module\n");
1492 }
1493
1494 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1495
1496 static struct configfs_attribute *usbg_wwn_attrs[] = {
1497         &usbg_wwn_attr_version,
1498         NULL,
1499 };
1500
1501 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1502 {
1503         struct se_portal_group *se_tpg = to_tpg(item);
1504         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1505
1506         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1507 }
1508
1509 static int usbg_attach(struct usbg_tpg *);
1510 static void usbg_detach(struct usbg_tpg *);
1511
1512 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1513                 const char *page, size_t count)
1514 {
1515         struct se_portal_group *se_tpg = to_tpg(item);
1516         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1517         bool op;
1518         ssize_t ret;
1519
1520         ret = strtobool(page, &op);
1521         if (ret)
1522                 return ret;
1523
1524         if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1525                 return -EINVAL;
1526
1527         if (op)
1528                 ret = usbg_attach(tpg);
1529         else
1530                 usbg_detach(tpg);
1531         if (ret)
1532                 return ret;
1533
1534         tpg->gadget_connect = op;
1535
1536         return count;
1537 }
1538
1539 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1540 {
1541         struct se_portal_group *se_tpg = to_tpg(item);
1542         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1543         struct tcm_usbg_nexus *tv_nexus;
1544         ssize_t ret;
1545
1546         mutex_lock(&tpg->tpg_mutex);
1547         tv_nexus = tpg->tpg_nexus;
1548         if (!tv_nexus) {
1549                 ret = -ENODEV;
1550                 goto out;
1551         }
1552         ret = snprintf(page, PAGE_SIZE, "%s\n",
1553                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1554 out:
1555         mutex_unlock(&tpg->tpg_mutex);
1556         return ret;
1557 }
1558
1559 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1560                               struct se_session *se_sess, void *p)
1561 {
1562         struct usbg_tpg *tpg = container_of(se_tpg,
1563                                 struct usbg_tpg, se_tpg);
1564
1565         tpg->tpg_nexus = p;
1566         return 0;
1567 }
1568
1569 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1570 {
1571         struct tcm_usbg_nexus *tv_nexus;
1572         int ret = 0;
1573
1574         mutex_lock(&tpg->tpg_mutex);
1575         if (tpg->tpg_nexus) {
1576                 ret = -EEXIST;
1577                 pr_debug("tpg->tpg_nexus already exists\n");
1578                 goto out_unlock;
1579         }
1580
1581         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1582         if (!tv_nexus) {
1583                 ret = -ENOMEM;
1584                 goto out_unlock;
1585         }
1586
1587         tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1588                                                      USB_G_DEFAULT_SESSION_TAGS,
1589                                                      sizeof(struct usbg_cmd),
1590                                                      TARGET_PROT_NORMAL, name,
1591                                                      tv_nexus, usbg_alloc_sess_cb);
1592         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1593 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1594                 pr_debug(MAKE_NEXUS_MSG, name);
1595 #undef MAKE_NEXUS_MSG
1596                 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1597                 kfree(tv_nexus);
1598         }
1599
1600 out_unlock:
1601         mutex_unlock(&tpg->tpg_mutex);
1602         return ret;
1603 }
1604
1605 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1606 {
1607         struct se_session *se_sess;
1608         struct tcm_usbg_nexus *tv_nexus;
1609         int ret = -ENODEV;
1610
1611         mutex_lock(&tpg->tpg_mutex);
1612         tv_nexus = tpg->tpg_nexus;
1613         if (!tv_nexus)
1614                 goto out;
1615
1616         se_sess = tv_nexus->tvn_se_sess;
1617         if (!se_sess)
1618                 goto out;
1619
1620         if (atomic_read(&tpg->tpg_port_count)) {
1621                 ret = -EPERM;
1622 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1623                 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1624 #undef MSG
1625                 goto out;
1626         }
1627
1628         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1629                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1630         /*
1631          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1632          */
1633         target_remove_session(se_sess);
1634         tpg->tpg_nexus = NULL;
1635
1636         kfree(tv_nexus);
1637         ret = 0;
1638 out:
1639         mutex_unlock(&tpg->tpg_mutex);
1640         return ret;
1641 }
1642
1643 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1644                 const char *page, size_t count)
1645 {
1646         struct se_portal_group *se_tpg = to_tpg(item);
1647         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1648         unsigned char i_port[USBG_NAMELEN], *ptr;
1649         int ret;
1650
1651         if (!strncmp(page, "NULL", 4)) {
1652                 ret = tcm_usbg_drop_nexus(tpg);
1653                 return (!ret) ? count : ret;
1654         }
1655         if (strlen(page) >= USBG_NAMELEN) {
1656
1657 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1658                 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1659 #undef NEXUS_STORE_MSG
1660                 return -EINVAL;
1661         }
1662         snprintf(i_port, USBG_NAMELEN, "%s", page);
1663
1664         ptr = strstr(i_port, "naa.");
1665         if (!ptr) {
1666                 pr_err("Missing 'naa.' prefix\n");
1667                 return -EINVAL;
1668         }
1669
1670         if (i_port[strlen(i_port) - 1] == '\n')
1671                 i_port[strlen(i_port) - 1] = '\0';
1672
1673         ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1674         if (ret < 0)
1675                 return ret;
1676         return count;
1677 }
1678
1679 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1680 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1681
1682 static struct configfs_attribute *usbg_base_attrs[] = {
1683         &tcm_usbg_tpg_attr_enable,
1684         &tcm_usbg_tpg_attr_nexus,
1685         NULL,
1686 };
1687
1688 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1689 {
1690         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1691
1692         atomic_inc(&tpg->tpg_port_count);
1693         smp_mb__after_atomic();
1694         return 0;
1695 }
1696
1697 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1698                 struct se_lun *se_lun)
1699 {
1700         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1701
1702         atomic_dec(&tpg->tpg_port_count);
1703         smp_mb__after_atomic();
1704 }
1705
1706 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1707 {
1708         return target_put_sess_cmd(se_cmd);
1709 }
1710
1711 static const struct target_core_fabric_ops usbg_ops = {
1712         .module                         = THIS_MODULE,
1713         .fabric_name                    = "usb_gadget",
1714         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1715         .tpg_get_tag                    = usbg_get_tag,
1716         .tpg_check_demo_mode            = usbg_check_true,
1717         .tpg_check_demo_mode_cache      = usbg_check_false,
1718         .tpg_check_demo_mode_write_protect = usbg_check_false,
1719         .tpg_check_prod_mode_write_protect = usbg_check_false,
1720         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1721         .release_cmd                    = usbg_release_cmd,
1722         .sess_get_index                 = usbg_sess_get_index,
1723         .sess_get_initiator_sid         = NULL,
1724         .write_pending                  = usbg_send_write_request,
1725         .set_default_node_attributes    = usbg_set_default_node_attrs,
1726         .get_cmd_state                  = usbg_get_cmd_state,
1727         .queue_data_in                  = usbg_send_read_response,
1728         .queue_status                   = usbg_send_status_response,
1729         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1730         .aborted_task                   = usbg_aborted_task,
1731         .check_stop_free                = usbg_check_stop_free,
1732
1733         .fabric_make_wwn                = usbg_make_tport,
1734         .fabric_drop_wwn                = usbg_drop_tport,
1735         .fabric_make_tpg                = usbg_make_tpg,
1736         .fabric_drop_tpg                = usbg_drop_tpg,
1737         .fabric_post_link               = usbg_port_link,
1738         .fabric_pre_unlink              = usbg_port_unlink,
1739         .fabric_init_nodeacl            = usbg_init_nodeacl,
1740
1741         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1742         .tfc_tpg_base_attrs             = usbg_base_attrs,
1743 };
1744
1745 /* Start gadget.c code */
1746
1747 static struct usb_interface_descriptor bot_intf_desc = {
1748         .bLength =              sizeof(bot_intf_desc),
1749         .bDescriptorType =      USB_DT_INTERFACE,
1750         .bNumEndpoints =        2,
1751         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1752         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1753         .bInterfaceSubClass =   USB_SC_SCSI,
1754         .bInterfaceProtocol =   USB_PR_BULK,
1755 };
1756
1757 static struct usb_interface_descriptor uasp_intf_desc = {
1758         .bLength =              sizeof(uasp_intf_desc),
1759         .bDescriptorType =      USB_DT_INTERFACE,
1760         .bNumEndpoints =        4,
1761         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1762         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1763         .bInterfaceSubClass =   USB_SC_SCSI,
1764         .bInterfaceProtocol =   USB_PR_UAS,
1765 };
1766
1767 static struct usb_endpoint_descriptor uasp_bi_desc = {
1768         .bLength =              USB_DT_ENDPOINT_SIZE,
1769         .bDescriptorType =      USB_DT_ENDPOINT,
1770         .bEndpointAddress =     USB_DIR_IN,
1771         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1772         .wMaxPacketSize =       cpu_to_le16(512),
1773 };
1774
1775 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1776         .bLength =              USB_DT_ENDPOINT_SIZE,
1777         .bDescriptorType =      USB_DT_ENDPOINT,
1778         .bEndpointAddress =     USB_DIR_IN,
1779         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1780 };
1781
1782 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1783         .bLength =              sizeof(uasp_bi_pipe_desc),
1784         .bDescriptorType =      USB_DT_PIPE_USAGE,
1785         .bPipeID =              DATA_IN_PIPE_ID,
1786 };
1787
1788 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1789         .bLength =              USB_DT_ENDPOINT_SIZE,
1790         .bDescriptorType =      USB_DT_ENDPOINT,
1791         .bEndpointAddress =     USB_DIR_IN,
1792         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1793         .wMaxPacketSize =       cpu_to_le16(1024),
1794 };
1795
1796 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1797         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1798         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1799         .bMaxBurst =            0,
1800         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1801         .wBytesPerInterval =    0,
1802 };
1803
1804 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1805         .bLength =              sizeof(bot_bi_ep_comp_desc),
1806         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1807         .bMaxBurst =            0,
1808 };
1809
1810 static struct usb_endpoint_descriptor uasp_bo_desc = {
1811         .bLength =              USB_DT_ENDPOINT_SIZE,
1812         .bDescriptorType =      USB_DT_ENDPOINT,
1813         .bEndpointAddress =     USB_DIR_OUT,
1814         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1815         .wMaxPacketSize =       cpu_to_le16(512),
1816 };
1817
1818 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1819         .bLength =              USB_DT_ENDPOINT_SIZE,
1820         .bDescriptorType =      USB_DT_ENDPOINT,
1821         .bEndpointAddress =     USB_DIR_OUT,
1822         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1823 };
1824
1825 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1826         .bLength =              sizeof(uasp_bo_pipe_desc),
1827         .bDescriptorType =      USB_DT_PIPE_USAGE,
1828         .bPipeID =              DATA_OUT_PIPE_ID,
1829 };
1830
1831 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1832         .bLength =              USB_DT_ENDPOINT_SIZE,
1833         .bDescriptorType =      USB_DT_ENDPOINT,
1834         .bEndpointAddress =     USB_DIR_OUT,
1835         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1836         .wMaxPacketSize =       cpu_to_le16(0x400),
1837 };
1838
1839 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1840         .bLength =              sizeof(uasp_bo_ep_comp_desc),
1841         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1842         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1843 };
1844
1845 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1846         .bLength =              sizeof(bot_bo_ep_comp_desc),
1847         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1848 };
1849
1850 static struct usb_endpoint_descriptor uasp_status_desc = {
1851         .bLength =              USB_DT_ENDPOINT_SIZE,
1852         .bDescriptorType =      USB_DT_ENDPOINT,
1853         .bEndpointAddress =     USB_DIR_IN,
1854         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1855         .wMaxPacketSize =       cpu_to_le16(512),
1856 };
1857
1858 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1859         .bLength =              USB_DT_ENDPOINT_SIZE,
1860         .bDescriptorType =      USB_DT_ENDPOINT,
1861         .bEndpointAddress =     USB_DIR_IN,
1862         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1863 };
1864
1865 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1866         .bLength =              sizeof(uasp_status_pipe_desc),
1867         .bDescriptorType =      USB_DT_PIPE_USAGE,
1868         .bPipeID =              STATUS_PIPE_ID,
1869 };
1870
1871 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1872         .bLength =              USB_DT_ENDPOINT_SIZE,
1873         .bDescriptorType =      USB_DT_ENDPOINT,
1874         .bEndpointAddress =     USB_DIR_IN,
1875         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1876         .wMaxPacketSize =       cpu_to_le16(1024),
1877 };
1878
1879 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1880         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
1881         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1882         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1883 };
1884
1885 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1886         .bLength =              USB_DT_ENDPOINT_SIZE,
1887         .bDescriptorType =      USB_DT_ENDPOINT,
1888         .bEndpointAddress =     USB_DIR_OUT,
1889         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1890         .wMaxPacketSize =       cpu_to_le16(512),
1891 };
1892
1893 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1894         .bLength =              USB_DT_ENDPOINT_SIZE,
1895         .bDescriptorType =      USB_DT_ENDPOINT,
1896         .bEndpointAddress =     USB_DIR_OUT,
1897         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1898 };
1899
1900 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1901         .bLength =              sizeof(uasp_cmd_pipe_desc),
1902         .bDescriptorType =      USB_DT_PIPE_USAGE,
1903         .bPipeID =              CMD_PIPE_ID,
1904 };
1905
1906 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1907         .bLength =              USB_DT_ENDPOINT_SIZE,
1908         .bDescriptorType =      USB_DT_ENDPOINT,
1909         .bEndpointAddress =     USB_DIR_OUT,
1910         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1911         .wMaxPacketSize =       cpu_to_le16(1024),
1912 };
1913
1914 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1915         .bLength =              sizeof(uasp_cmd_comp_desc),
1916         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1917 };
1918
1919 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1920         (struct usb_descriptor_header *) &bot_intf_desc,
1921         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1922         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1923
1924         (struct usb_descriptor_header *) &uasp_intf_desc,
1925         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1926         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1927         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1928         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1929         (struct usb_descriptor_header *) &uasp_fs_status_desc,
1930         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1931         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1932         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1933         NULL,
1934 };
1935
1936 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1937         (struct usb_descriptor_header *) &bot_intf_desc,
1938         (struct usb_descriptor_header *) &uasp_bi_desc,
1939         (struct usb_descriptor_header *) &uasp_bo_desc,
1940
1941         (struct usb_descriptor_header *) &uasp_intf_desc,
1942         (struct usb_descriptor_header *) &uasp_bi_desc,
1943         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1944         (struct usb_descriptor_header *) &uasp_bo_desc,
1945         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1946         (struct usb_descriptor_header *) &uasp_status_desc,
1947         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1948         (struct usb_descriptor_header *) &uasp_cmd_desc,
1949         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1950         NULL,
1951 };
1952
1953 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1954         (struct usb_descriptor_header *) &bot_intf_desc,
1955         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1956         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1957         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1958         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1959
1960         (struct usb_descriptor_header *) &uasp_intf_desc,
1961         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1962         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1963         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1964         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1965         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1966         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1967         (struct usb_descriptor_header *) &uasp_ss_status_desc,
1968         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1969         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1970         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1971         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1972         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1973         NULL,
1974 };
1975
1976 static struct usb_string        tcm_us_strings[] = {
1977         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
1978         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
1979         { },
1980 };
1981
1982 static struct usb_gadget_strings tcm_stringtab = {
1983         .language = 0x0409,
1984         .strings = tcm_us_strings,
1985 };
1986
1987 static struct usb_gadget_strings *tcm_strings[] = {
1988         &tcm_stringtab,
1989         NULL,
1990 };
1991
1992 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1993 {
1994         struct f_uas            *fu = to_f_uas(f);
1995         struct usb_string       *us;
1996         struct usb_gadget       *gadget = c->cdev->gadget;
1997         struct usb_ep           *ep;
1998         struct f_tcm_opts       *opts;
1999         int                     iface;
2000         int                     ret;
2001
2002         opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2003
2004         mutex_lock(&opts->dep_lock);
2005         if (!opts->can_attach) {
2006                 mutex_unlock(&opts->dep_lock);
2007                 return -ENODEV;
2008         }
2009         mutex_unlock(&opts->dep_lock);
2010         us = usb_gstrings_attach(c->cdev, tcm_strings,
2011                 ARRAY_SIZE(tcm_us_strings));
2012         if (IS_ERR(us))
2013                 return PTR_ERR(us);
2014         bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2015         uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2016
2017         iface = usb_interface_id(c, f);
2018         if (iface < 0)
2019                 return iface;
2020
2021         bot_intf_desc.bInterfaceNumber = iface;
2022         uasp_intf_desc.bInterfaceNumber = iface;
2023         fu->iface = iface;
2024         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2025                         &uasp_bi_ep_comp_desc);
2026         if (!ep)
2027                 goto ep_fail;
2028
2029         fu->ep_in = ep;
2030
2031         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2032                         &uasp_bo_ep_comp_desc);
2033         if (!ep)
2034                 goto ep_fail;
2035         fu->ep_out = ep;
2036
2037         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2038                         &uasp_status_in_ep_comp_desc);
2039         if (!ep)
2040                 goto ep_fail;
2041         fu->ep_status = ep;
2042
2043         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2044                         &uasp_cmd_comp_desc);
2045         if (!ep)
2046                 goto ep_fail;
2047         fu->ep_cmd = ep;
2048
2049         /* Assume endpoint addresses are the same for both speeds */
2050         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2051         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2052         uasp_status_desc.bEndpointAddress =
2053                 uasp_ss_status_desc.bEndpointAddress;
2054         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2055
2056         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2057         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2058         uasp_fs_status_desc.bEndpointAddress =
2059                 uasp_ss_status_desc.bEndpointAddress;
2060         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2061
2062         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2063                         uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2064         if (ret)
2065                 goto ep_fail;
2066
2067         return 0;
2068 ep_fail:
2069         pr_err("Can't claim all required eps\n");
2070
2071         return -ENOTSUPP;
2072 }
2073
2074 struct guas_setup_wq {
2075         struct work_struct work;
2076         struct f_uas *fu;
2077         unsigned int alt;
2078 };
2079
2080 static void tcm_delayed_set_alt(struct work_struct *wq)
2081 {
2082         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2083                         work);
2084         struct f_uas *fu = work->fu;
2085         int alt = work->alt;
2086
2087         kfree(work);
2088
2089         if (fu->flags & USBG_IS_BOT)
2090                 bot_cleanup_old_alt(fu);
2091         if (fu->flags & USBG_IS_UAS)
2092                 uasp_cleanup_old_alt(fu);
2093
2094         if (alt == USB_G_ALT_INT_BBB)
2095                 bot_set_alt(fu);
2096         else if (alt == USB_G_ALT_INT_UAS)
2097                 uasp_set_alt(fu);
2098         usb_composite_setup_continue(fu->function.config->cdev);
2099 }
2100
2101 static int tcm_get_alt(struct usb_function *f, unsigned intf)
2102 {
2103         if (intf == bot_intf_desc.bInterfaceNumber)
2104                 return USB_G_ALT_INT_BBB;
2105         if (intf == uasp_intf_desc.bInterfaceNumber)
2106                 return USB_G_ALT_INT_UAS;
2107
2108         return -EOPNOTSUPP;
2109 }
2110
2111 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2112 {
2113         struct f_uas *fu = to_f_uas(f);
2114
2115         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2116                 struct guas_setup_wq *work;
2117
2118                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2119                 if (!work)
2120                         return -ENOMEM;
2121                 INIT_WORK(&work->work, tcm_delayed_set_alt);
2122                 work->fu = fu;
2123                 work->alt = alt;
2124                 schedule_work(&work->work);
2125                 return USB_GADGET_DELAYED_STATUS;
2126         }
2127         return -EOPNOTSUPP;
2128 }
2129
2130 static void tcm_disable(struct usb_function *f)
2131 {
2132         struct f_uas *fu = to_f_uas(f);
2133
2134         if (fu->flags & USBG_IS_UAS)
2135                 uasp_cleanup_old_alt(fu);
2136         else if (fu->flags & USBG_IS_BOT)
2137                 bot_cleanup_old_alt(fu);
2138         fu->flags = 0;
2139 }
2140
2141 static int tcm_setup(struct usb_function *f,
2142                 const struct usb_ctrlrequest *ctrl)
2143 {
2144         struct f_uas *fu = to_f_uas(f);
2145
2146         if (!(fu->flags & USBG_IS_BOT))
2147                 return -EOPNOTSUPP;
2148
2149         return usbg_bot_setup(f, ctrl);
2150 }
2151
2152 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2153 {
2154         return container_of(to_config_group(item), struct f_tcm_opts,
2155                 func_inst.group);
2156 }
2157
2158 static void tcm_attr_release(struct config_item *item)
2159 {
2160         struct f_tcm_opts *opts = to_f_tcm_opts(item);
2161
2162         usb_put_function_instance(&opts->func_inst);
2163 }
2164
2165 static struct configfs_item_operations tcm_item_ops = {
2166         .release                = tcm_attr_release,
2167 };
2168
2169 static const struct config_item_type tcm_func_type = {
2170         .ct_item_ops    = &tcm_item_ops,
2171         .ct_owner       = THIS_MODULE,
2172 };
2173
2174 static void tcm_free_inst(struct usb_function_instance *f)
2175 {
2176         struct f_tcm_opts *opts;
2177         unsigned i;
2178
2179         opts = container_of(f, struct f_tcm_opts, func_inst);
2180
2181         mutex_lock(&tpg_instances_lock);
2182         for (i = 0; i < TPG_INSTANCES; ++i)
2183                 if (tpg_instances[i].func_inst == f)
2184                         break;
2185         if (i < TPG_INSTANCES)
2186                 tpg_instances[i].func_inst = NULL;
2187         mutex_unlock(&tpg_instances_lock);
2188
2189         kfree(opts);
2190 }
2191
2192 static int tcm_register_callback(struct usb_function_instance *f)
2193 {
2194         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2195
2196         mutex_lock(&opts->dep_lock);
2197         opts->can_attach = true;
2198         mutex_unlock(&opts->dep_lock);
2199
2200         return 0;
2201 }
2202
2203 static void tcm_unregister_callback(struct usb_function_instance *f)
2204 {
2205         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2206
2207         mutex_lock(&opts->dep_lock);
2208         unregister_gadget_item(opts->
2209                 func_inst.group.cg_item.ci_parent->ci_parent);
2210         opts->can_attach = false;
2211         mutex_unlock(&opts->dep_lock);
2212 }
2213
2214 static int usbg_attach(struct usbg_tpg *tpg)
2215 {
2216         struct usb_function_instance *f = tpg->fi;
2217         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2218
2219         if (opts->tcm_register_callback)
2220                 return opts->tcm_register_callback(f);
2221
2222         return 0;
2223 }
2224
2225 static void usbg_detach(struct usbg_tpg *tpg)
2226 {
2227         struct usb_function_instance *f = tpg->fi;
2228         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2229
2230         if (opts->tcm_unregister_callback)
2231                 opts->tcm_unregister_callback(f);
2232 }
2233
2234 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2235 {
2236         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2237
2238         pr_debug("tcm: Activating %s\n", name);
2239
2240         mutex_lock(&opts->dep_lock);
2241         opts->ready = true;
2242         mutex_unlock(&opts->dep_lock);
2243
2244         return 0;
2245 }
2246
2247 static struct usb_function_instance *tcm_alloc_inst(void)
2248 {
2249         struct f_tcm_opts *opts;
2250         int i;
2251
2252
2253         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2254         if (!opts)
2255                 return ERR_PTR(-ENOMEM);
2256
2257         mutex_lock(&tpg_instances_lock);
2258         for (i = 0; i < TPG_INSTANCES; ++i)
2259                 if (!tpg_instances[i].func_inst)
2260                         break;
2261
2262         if (i == TPG_INSTANCES) {
2263                 mutex_unlock(&tpg_instances_lock);
2264                 kfree(opts);
2265                 return ERR_PTR(-EBUSY);
2266         }
2267         tpg_instances[i].func_inst = &opts->func_inst;
2268         mutex_unlock(&tpg_instances_lock);
2269
2270         mutex_init(&opts->dep_lock);
2271         opts->func_inst.set_inst_name = tcm_set_name;
2272         opts->func_inst.free_func_inst = tcm_free_inst;
2273         opts->tcm_register_callback = tcm_register_callback;
2274         opts->tcm_unregister_callback = tcm_unregister_callback;
2275
2276         config_group_init_type_name(&opts->func_inst.group, "",
2277                         &tcm_func_type);
2278
2279         return &opts->func_inst;
2280 }
2281
2282 static void tcm_free(struct usb_function *f)
2283 {
2284         struct f_uas *tcm = to_f_uas(f);
2285
2286         kfree(tcm);
2287 }
2288
2289 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2290 {
2291         usb_free_all_descriptors(f);
2292 }
2293
2294 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2295 {
2296         struct f_uas *fu;
2297         unsigned i;
2298
2299         mutex_lock(&tpg_instances_lock);
2300         for (i = 0; i < TPG_INSTANCES; ++i)
2301                 if (tpg_instances[i].func_inst == fi)
2302                         break;
2303         if (i == TPG_INSTANCES) {
2304                 mutex_unlock(&tpg_instances_lock);
2305                 return ERR_PTR(-ENODEV);
2306         }
2307
2308         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2309         if (!fu) {
2310                 mutex_unlock(&tpg_instances_lock);
2311                 return ERR_PTR(-ENOMEM);
2312         }
2313
2314         fu->function.name = "Target Function";
2315         fu->function.bind = tcm_bind;
2316         fu->function.unbind = tcm_unbind;
2317         fu->function.set_alt = tcm_set_alt;
2318         fu->function.get_alt = tcm_get_alt;
2319         fu->function.setup = tcm_setup;
2320         fu->function.disable = tcm_disable;
2321         fu->function.free_func = tcm_free;
2322         fu->tpg = tpg_instances[i].tpg;
2323         mutex_unlock(&tpg_instances_lock);
2324
2325         return &fu->function;
2326 }
2327
2328 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2329
2330 static int tcm_init(void)
2331 {
2332         int ret;
2333
2334         ret = usb_function_register(&tcmusb_func);
2335         if (ret)
2336                 return ret;
2337
2338         ret = target_register_template(&usbg_ops);
2339         if (ret)
2340                 usb_function_unregister(&tcmusb_func);
2341
2342         return ret;
2343 }
2344 module_init(tcm_init);
2345
2346 static void tcm_exit(void)
2347 {
2348         target_unregister_template(&usbg_ops);
2349         usb_function_unregister(&tcmusb_func);
2350 }
2351 module_exit(tcm_exit);
2352
2353 MODULE_LICENSE("GPL");
2354 MODULE_AUTHOR("Sebastian Andrzej Siewior");