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                 goto out;
1057         }
1058
1059         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1060                               cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1061                               cmd->prio_attr, dir, flags) < 0)
1062                 goto out;
1063
1064         return;
1065
1066 out:
1067         transport_send_check_condition_and_sense(se_cmd,
1068                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1069         transport_generic_free_cmd(&cmd->se_cmd, 0);
1070 }
1071
1072 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
1073                 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag)
1074 {
1075         struct se_session *se_sess = tv_nexus->tvn_se_sess;
1076         struct usbg_cmd *cmd;
1077         int tag, cpu;
1078
1079         tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
1080         if (tag < 0)
1081                 return ERR_PTR(-ENOMEM);
1082
1083         cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
1084         memset(cmd, 0, sizeof(*cmd));
1085         cmd->se_cmd.map_tag = tag;
1086         cmd->se_cmd.map_cpu = cpu;
1087         cmd->se_cmd.tag = cmd->tag = scsi_tag;
1088         cmd->fu = fu;
1089
1090         return cmd;
1091 }
1092
1093 static void usbg_release_cmd(struct se_cmd *);
1094
1095 static int usbg_submit_command(struct f_uas *fu,
1096                 void *cmdbuf, unsigned int len)
1097 {
1098         struct command_iu *cmd_iu = cmdbuf;
1099         struct usbg_cmd *cmd;
1100         struct usbg_tpg *tpg = fu->tpg;
1101         struct tcm_usbg_nexus *tv_nexus;
1102         u32 cmd_len;
1103         u16 scsi_tag;
1104
1105         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1106                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1107                 return -EINVAL;
1108         }
1109
1110         tv_nexus = tpg->tpg_nexus;
1111         if (!tv_nexus) {
1112                 pr_err("Missing nexus, ignoring command\n");
1113                 return -EINVAL;
1114         }
1115
1116         cmd_len = (cmd_iu->len & ~0x3) + 16;
1117         if (cmd_len > USBG_MAX_CMD)
1118                 return -EINVAL;
1119
1120         scsi_tag = be16_to_cpup(&cmd_iu->tag);
1121         cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag);
1122         if (IS_ERR(cmd)) {
1123                 pr_err("usbg_get_cmd failed\n");
1124                 return -ENOMEM;
1125         }
1126         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1127
1128         if (fu->flags & USBG_USE_STREAMS) {
1129                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1130                         goto err;
1131                 if (!cmd->tag)
1132                         cmd->stream = &fu->stream[0];
1133                 else
1134                         cmd->stream = &fu->stream[cmd->tag - 1];
1135         } else {
1136                 cmd->stream = &fu->stream[0];
1137         }
1138
1139         switch (cmd_iu->prio_attr & 0x7) {
1140         case UAS_HEAD_TAG:
1141                 cmd->prio_attr = TCM_HEAD_TAG;
1142                 break;
1143         case UAS_ORDERED_TAG:
1144                 cmd->prio_attr = TCM_ORDERED_TAG;
1145                 break;
1146         case UAS_ACA:
1147                 cmd->prio_attr = TCM_ACA_TAG;
1148                 break;
1149         default:
1150                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1151                                 cmd_iu->prio_attr);
1152                 /* fall through */
1153         case UAS_SIMPLE_TAG:
1154                 cmd->prio_attr = TCM_SIMPLE_TAG;
1155                 break;
1156         }
1157
1158         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1159
1160         INIT_WORK(&cmd->work, usbg_cmd_work);
1161         queue_work(tpg->workqueue, &cmd->work);
1162
1163         return 0;
1164 err:
1165         usbg_release_cmd(&cmd->se_cmd);
1166         return -EINVAL;
1167 }
1168
1169 static void bot_cmd_work(struct work_struct *work)
1170 {
1171         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1172         struct se_cmd *se_cmd;
1173         struct tcm_usbg_nexus *tv_nexus;
1174         struct usbg_tpg *tpg;
1175         int dir;
1176
1177         se_cmd = &cmd->se_cmd;
1178         tpg = cmd->fu->tpg;
1179         tv_nexus = tpg->tpg_nexus;
1180         dir = get_cmd_dir(cmd->cmd_buf);
1181         if (dir < 0) {
1182                 transport_init_se_cmd(se_cmd,
1183                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1184                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1185                                 cmd->prio_attr, cmd->sense_iu.sense);
1186                 goto out;
1187         }
1188
1189         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1190                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1191                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1192                 goto out;
1193
1194         return;
1195
1196 out:
1197         transport_send_check_condition_and_sense(se_cmd,
1198                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1199         transport_generic_free_cmd(&cmd->se_cmd, 0);
1200 }
1201
1202 static int bot_submit_command(struct f_uas *fu,
1203                 void *cmdbuf, unsigned int len)
1204 {
1205         struct bulk_cb_wrap *cbw = cmdbuf;
1206         struct usbg_cmd *cmd;
1207         struct usbg_tpg *tpg = fu->tpg;
1208         struct tcm_usbg_nexus *tv_nexus;
1209         u32 cmd_len;
1210
1211         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1212                 pr_err("Wrong signature on CBW\n");
1213                 return -EINVAL;
1214         }
1215         if (len != 31) {
1216                 pr_err("Wrong length for CBW\n");
1217                 return -EINVAL;
1218         }
1219
1220         cmd_len = cbw->Length;
1221         if (cmd_len < 1 || cmd_len > 16)
1222                 return -EINVAL;
1223
1224         tv_nexus = tpg->tpg_nexus;
1225         if (!tv_nexus) {
1226                 pr_err("Missing nexus, ignoring command\n");
1227                 return -ENODEV;
1228         }
1229
1230         cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1231         if (IS_ERR(cmd)) {
1232                 pr_err("usbg_get_cmd failed\n");
1233                 return -ENOMEM;
1234         }
1235         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1236
1237         cmd->bot_tag = cbw->Tag;
1238         cmd->prio_attr = TCM_SIMPLE_TAG;
1239         cmd->unpacked_lun = cbw->Lun;
1240         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1241         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1242         cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1243
1244         INIT_WORK(&cmd->work, bot_cmd_work);
1245         queue_work(tpg->workqueue, &cmd->work);
1246
1247         return 0;
1248 }
1249
1250 /* Start fabric.c code */
1251
1252 static int usbg_check_true(struct se_portal_group *se_tpg)
1253 {
1254         return 1;
1255 }
1256
1257 static int usbg_check_false(struct se_portal_group *se_tpg)
1258 {
1259         return 0;
1260 }
1261
1262 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1263 {
1264         struct usbg_tpg *tpg = container_of(se_tpg,
1265                                 struct usbg_tpg, se_tpg);
1266         struct usbg_tport *tport = tpg->tport;
1267
1268         return &tport->tport_name[0];
1269 }
1270
1271 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1272 {
1273         struct usbg_tpg *tpg = container_of(se_tpg,
1274                                 struct usbg_tpg, se_tpg);
1275         return tpg->tport_tpgt;
1276 }
1277
1278 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1279 {
1280         return 1;
1281 }
1282
1283 static void usbg_release_cmd(struct se_cmd *se_cmd)
1284 {
1285         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1286                         se_cmd);
1287         struct se_session *se_sess = se_cmd->se_sess;
1288
1289         kfree(cmd->data_buf);
1290         target_free_tag(se_sess, se_cmd);
1291 }
1292
1293 static u32 usbg_sess_get_index(struct se_session *se_sess)
1294 {
1295         return 0;
1296 }
1297
1298 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1299 {
1300 }
1301
1302 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1303 {
1304         return 0;
1305 }
1306
1307 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1308 {
1309 }
1310
1311 static void usbg_aborted_task(struct se_cmd *se_cmd)
1312 {
1313 }
1314
1315 static const char *usbg_check_wwn(const char *name)
1316 {
1317         const char *n;
1318         unsigned int len;
1319
1320         n = strstr(name, "naa.");
1321         if (!n)
1322                 return NULL;
1323         n += 4;
1324         len = strlen(n);
1325         if (len == 0 || len > USBG_NAMELEN - 1)
1326                 return NULL;
1327         return n;
1328 }
1329
1330 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1331 {
1332         if (!usbg_check_wwn(name))
1333                 return -EINVAL;
1334         return 0;
1335 }
1336
1337 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1338                                              const char *name)
1339 {
1340         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1341                         tport_wwn);
1342         struct usbg_tpg *tpg;
1343         unsigned long tpgt;
1344         int ret;
1345         struct f_tcm_opts *opts;
1346         unsigned i;
1347
1348         if (strstr(name, "tpgt_") != name)
1349                 return ERR_PTR(-EINVAL);
1350         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1351                 return ERR_PTR(-EINVAL);
1352         ret = -ENODEV;
1353         mutex_lock(&tpg_instances_lock);
1354         for (i = 0; i < TPG_INSTANCES; ++i)
1355                 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1356                         break;
1357         if (i == TPG_INSTANCES)
1358                 goto unlock_inst;
1359
1360         opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1361                 func_inst);
1362         mutex_lock(&opts->dep_lock);
1363         if (!opts->ready)
1364                 goto unlock_dep;
1365
1366         if (opts->has_dep) {
1367                 if (!try_module_get(opts->dependent))
1368                         goto unlock_dep;
1369         } else {
1370                 ret = configfs_depend_item_unlocked(
1371                         wwn->wwn_group.cg_subsys,
1372                         &opts->func_inst.group.cg_item);
1373                 if (ret)
1374                         goto unlock_dep;
1375         }
1376
1377         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1378         ret = -ENOMEM;
1379         if (!tpg)
1380                 goto unref_dep;
1381         mutex_init(&tpg->tpg_mutex);
1382         atomic_set(&tpg->tpg_port_count, 0);
1383         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1384         if (!tpg->workqueue)
1385                 goto free_tpg;
1386
1387         tpg->tport = tport;
1388         tpg->tport_tpgt = tpgt;
1389
1390         /*
1391          * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1392          * pretend to be SAS..
1393          */
1394         ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1395         if (ret < 0)
1396                 goto free_workqueue;
1397
1398         tpg_instances[i].tpg = tpg;
1399         tpg->fi = tpg_instances[i].func_inst;
1400         mutex_unlock(&opts->dep_lock);
1401         mutex_unlock(&tpg_instances_lock);
1402         return &tpg->se_tpg;
1403
1404 free_workqueue:
1405         destroy_workqueue(tpg->workqueue);
1406 free_tpg:
1407         kfree(tpg);
1408 unref_dep:
1409         if (opts->has_dep)
1410                 module_put(opts->dependent);
1411         else
1412                 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1413 unlock_dep:
1414         mutex_unlock(&opts->dep_lock);
1415 unlock_inst:
1416         mutex_unlock(&tpg_instances_lock);
1417
1418         return ERR_PTR(ret);
1419 }
1420
1421 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1422
1423 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1424 {
1425         struct usbg_tpg *tpg = container_of(se_tpg,
1426                                 struct usbg_tpg, se_tpg);
1427         unsigned i;
1428         struct f_tcm_opts *opts;
1429
1430         tcm_usbg_drop_nexus(tpg);
1431         core_tpg_deregister(se_tpg);
1432         destroy_workqueue(tpg->workqueue);
1433
1434         mutex_lock(&tpg_instances_lock);
1435         for (i = 0; i < TPG_INSTANCES; ++i)
1436                 if (tpg_instances[i].tpg == tpg)
1437                         break;
1438         if (i < TPG_INSTANCES) {
1439                 tpg_instances[i].tpg = NULL;
1440                 opts = container_of(tpg_instances[i].func_inst,
1441                         struct f_tcm_opts, func_inst);
1442                 mutex_lock(&opts->dep_lock);
1443                 if (opts->has_dep)
1444                         module_put(opts->dependent);
1445                 else
1446                         configfs_undepend_item_unlocked(
1447                                 &opts->func_inst.group.cg_item);
1448                 mutex_unlock(&opts->dep_lock);
1449         }
1450         mutex_unlock(&tpg_instances_lock);
1451
1452         kfree(tpg);
1453 }
1454
1455 static struct se_wwn *usbg_make_tport(
1456         struct target_fabric_configfs *tf,
1457         struct config_group *group,
1458         const char *name)
1459 {
1460         struct usbg_tport *tport;
1461         const char *wnn_name;
1462         u64 wwpn = 0;
1463
1464         wnn_name = usbg_check_wwn(name);
1465         if (!wnn_name)
1466                 return ERR_PTR(-EINVAL);
1467
1468         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1469         if (!(tport))
1470                 return ERR_PTR(-ENOMEM);
1471
1472         tport->tport_wwpn = wwpn;
1473         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1474         return &tport->tport_wwn;
1475 }
1476
1477 static void usbg_drop_tport(struct se_wwn *wwn)
1478 {
1479         struct usbg_tport *tport = container_of(wwn,
1480                                 struct usbg_tport, tport_wwn);
1481         kfree(tport);
1482 }
1483
1484 /*
1485  * If somebody feels like dropping the version property, go ahead.
1486  */
1487 static ssize_t usbg_wwn_version_show(struct config_item *item,  char *page)
1488 {
1489         return sprintf(page, "usb-gadget fabric module\n");
1490 }
1491
1492 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1493
1494 static struct configfs_attribute *usbg_wwn_attrs[] = {
1495         &usbg_wwn_attr_version,
1496         NULL,
1497 };
1498
1499 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1500 {
1501         struct se_portal_group *se_tpg = to_tpg(item);
1502         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1503
1504         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1505 }
1506
1507 static int usbg_attach(struct usbg_tpg *);
1508 static void usbg_detach(struct usbg_tpg *);
1509
1510 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1511                 const char *page, size_t count)
1512 {
1513         struct se_portal_group *se_tpg = to_tpg(item);
1514         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1515         bool op;
1516         ssize_t ret;
1517
1518         ret = strtobool(page, &op);
1519         if (ret)
1520                 return ret;
1521
1522         if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1523                 return -EINVAL;
1524
1525         if (op)
1526                 ret = usbg_attach(tpg);
1527         else
1528                 usbg_detach(tpg);
1529         if (ret)
1530                 return ret;
1531
1532         tpg->gadget_connect = op;
1533
1534         return count;
1535 }
1536
1537 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1538 {
1539         struct se_portal_group *se_tpg = to_tpg(item);
1540         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1541         struct tcm_usbg_nexus *tv_nexus;
1542         ssize_t ret;
1543
1544         mutex_lock(&tpg->tpg_mutex);
1545         tv_nexus = tpg->tpg_nexus;
1546         if (!tv_nexus) {
1547                 ret = -ENODEV;
1548                 goto out;
1549         }
1550         ret = snprintf(page, PAGE_SIZE, "%s\n",
1551                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1552 out:
1553         mutex_unlock(&tpg->tpg_mutex);
1554         return ret;
1555 }
1556
1557 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1558                               struct se_session *se_sess, void *p)
1559 {
1560         struct usbg_tpg *tpg = container_of(se_tpg,
1561                                 struct usbg_tpg, se_tpg);
1562
1563         tpg->tpg_nexus = p;
1564         return 0;
1565 }
1566
1567 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1568 {
1569         struct tcm_usbg_nexus *tv_nexus;
1570         int ret = 0;
1571
1572         mutex_lock(&tpg->tpg_mutex);
1573         if (tpg->tpg_nexus) {
1574                 ret = -EEXIST;
1575                 pr_debug("tpg->tpg_nexus already exists\n");
1576                 goto out_unlock;
1577         }
1578
1579         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1580         if (!tv_nexus) {
1581                 ret = -ENOMEM;
1582                 goto out_unlock;
1583         }
1584
1585         tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1586                                                      USB_G_DEFAULT_SESSION_TAGS,
1587                                                      sizeof(struct usbg_cmd),
1588                                                      TARGET_PROT_NORMAL, name,
1589                                                      tv_nexus, usbg_alloc_sess_cb);
1590         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1591 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1592                 pr_debug(MAKE_NEXUS_MSG, name);
1593 #undef MAKE_NEXUS_MSG
1594                 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1595                 kfree(tv_nexus);
1596         }
1597
1598 out_unlock:
1599         mutex_unlock(&tpg->tpg_mutex);
1600         return ret;
1601 }
1602
1603 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1604 {
1605         struct se_session *se_sess;
1606         struct tcm_usbg_nexus *tv_nexus;
1607         int ret = -ENODEV;
1608
1609         mutex_lock(&tpg->tpg_mutex);
1610         tv_nexus = tpg->tpg_nexus;
1611         if (!tv_nexus)
1612                 goto out;
1613
1614         se_sess = tv_nexus->tvn_se_sess;
1615         if (!se_sess)
1616                 goto out;
1617
1618         if (atomic_read(&tpg->tpg_port_count)) {
1619                 ret = -EPERM;
1620 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1621                 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1622 #undef MSG
1623                 goto out;
1624         }
1625
1626         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1627                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1628         /*
1629          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1630          */
1631         target_remove_session(se_sess);
1632         tpg->tpg_nexus = NULL;
1633
1634         kfree(tv_nexus);
1635         ret = 0;
1636 out:
1637         mutex_unlock(&tpg->tpg_mutex);
1638         return ret;
1639 }
1640
1641 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1642                 const char *page, size_t count)
1643 {
1644         struct se_portal_group *se_tpg = to_tpg(item);
1645         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1646         unsigned char i_port[USBG_NAMELEN], *ptr;
1647         int ret;
1648
1649         if (!strncmp(page, "NULL", 4)) {
1650                 ret = tcm_usbg_drop_nexus(tpg);
1651                 return (!ret) ? count : ret;
1652         }
1653         if (strlen(page) >= USBG_NAMELEN) {
1654
1655 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1656                 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1657 #undef NEXUS_STORE_MSG
1658                 return -EINVAL;
1659         }
1660         snprintf(i_port, USBG_NAMELEN, "%s", page);
1661
1662         ptr = strstr(i_port, "naa.");
1663         if (!ptr) {
1664                 pr_err("Missing 'naa.' prefix\n");
1665                 return -EINVAL;
1666         }
1667
1668         if (i_port[strlen(i_port) - 1] == '\n')
1669                 i_port[strlen(i_port) - 1] = '\0';
1670
1671         ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1672         if (ret < 0)
1673                 return ret;
1674         return count;
1675 }
1676
1677 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1678 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1679
1680 static struct configfs_attribute *usbg_base_attrs[] = {
1681         &tcm_usbg_tpg_attr_enable,
1682         &tcm_usbg_tpg_attr_nexus,
1683         NULL,
1684 };
1685
1686 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1687 {
1688         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1689
1690         atomic_inc(&tpg->tpg_port_count);
1691         smp_mb__after_atomic();
1692         return 0;
1693 }
1694
1695 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1696                 struct se_lun *se_lun)
1697 {
1698         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1699
1700         atomic_dec(&tpg->tpg_port_count);
1701         smp_mb__after_atomic();
1702 }
1703
1704 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1705 {
1706         return target_put_sess_cmd(se_cmd);
1707 }
1708
1709 static const struct target_core_fabric_ops usbg_ops = {
1710         .module                         = THIS_MODULE,
1711         .fabric_name                    = "usb_gadget",
1712         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1713         .tpg_get_tag                    = usbg_get_tag,
1714         .tpg_check_demo_mode            = usbg_check_true,
1715         .tpg_check_demo_mode_cache      = usbg_check_false,
1716         .tpg_check_demo_mode_write_protect = usbg_check_false,
1717         .tpg_check_prod_mode_write_protect = usbg_check_false,
1718         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1719         .release_cmd                    = usbg_release_cmd,
1720         .sess_get_index                 = usbg_sess_get_index,
1721         .sess_get_initiator_sid         = NULL,
1722         .write_pending                  = usbg_send_write_request,
1723         .set_default_node_attributes    = usbg_set_default_node_attrs,
1724         .get_cmd_state                  = usbg_get_cmd_state,
1725         .queue_data_in                  = usbg_send_read_response,
1726         .queue_status                   = usbg_send_status_response,
1727         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1728         .aborted_task                   = usbg_aborted_task,
1729         .check_stop_free                = usbg_check_stop_free,
1730
1731         .fabric_make_wwn                = usbg_make_tport,
1732         .fabric_drop_wwn                = usbg_drop_tport,
1733         .fabric_make_tpg                = usbg_make_tpg,
1734         .fabric_drop_tpg                = usbg_drop_tpg,
1735         .fabric_post_link               = usbg_port_link,
1736         .fabric_pre_unlink              = usbg_port_unlink,
1737         .fabric_init_nodeacl            = usbg_init_nodeacl,
1738
1739         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1740         .tfc_tpg_base_attrs             = usbg_base_attrs,
1741 };
1742
1743 /* Start gadget.c code */
1744
1745 static struct usb_interface_descriptor bot_intf_desc = {
1746         .bLength =              sizeof(bot_intf_desc),
1747         .bDescriptorType =      USB_DT_INTERFACE,
1748         .bNumEndpoints =        2,
1749         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1750         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1751         .bInterfaceSubClass =   USB_SC_SCSI,
1752         .bInterfaceProtocol =   USB_PR_BULK,
1753 };
1754
1755 static struct usb_interface_descriptor uasp_intf_desc = {
1756         .bLength =              sizeof(uasp_intf_desc),
1757         .bDescriptorType =      USB_DT_INTERFACE,
1758         .bNumEndpoints =        4,
1759         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1760         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1761         .bInterfaceSubClass =   USB_SC_SCSI,
1762         .bInterfaceProtocol =   USB_PR_UAS,
1763 };
1764
1765 static struct usb_endpoint_descriptor uasp_bi_desc = {
1766         .bLength =              USB_DT_ENDPOINT_SIZE,
1767         .bDescriptorType =      USB_DT_ENDPOINT,
1768         .bEndpointAddress =     USB_DIR_IN,
1769         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1770         .wMaxPacketSize =       cpu_to_le16(512),
1771 };
1772
1773 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1774         .bLength =              USB_DT_ENDPOINT_SIZE,
1775         .bDescriptorType =      USB_DT_ENDPOINT,
1776         .bEndpointAddress =     USB_DIR_IN,
1777         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1778 };
1779
1780 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1781         .bLength =              sizeof(uasp_bi_pipe_desc),
1782         .bDescriptorType =      USB_DT_PIPE_USAGE,
1783         .bPipeID =              DATA_IN_PIPE_ID,
1784 };
1785
1786 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1787         .bLength =              USB_DT_ENDPOINT_SIZE,
1788         .bDescriptorType =      USB_DT_ENDPOINT,
1789         .bEndpointAddress =     USB_DIR_IN,
1790         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1791         .wMaxPacketSize =       cpu_to_le16(1024),
1792 };
1793
1794 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1795         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1796         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1797         .bMaxBurst =            0,
1798         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1799         .wBytesPerInterval =    0,
1800 };
1801
1802 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1803         .bLength =              sizeof(bot_bi_ep_comp_desc),
1804         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1805         .bMaxBurst =            0,
1806 };
1807
1808 static struct usb_endpoint_descriptor uasp_bo_desc = {
1809         .bLength =              USB_DT_ENDPOINT_SIZE,
1810         .bDescriptorType =      USB_DT_ENDPOINT,
1811         .bEndpointAddress =     USB_DIR_OUT,
1812         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1813         .wMaxPacketSize =       cpu_to_le16(512),
1814 };
1815
1816 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1817         .bLength =              USB_DT_ENDPOINT_SIZE,
1818         .bDescriptorType =      USB_DT_ENDPOINT,
1819         .bEndpointAddress =     USB_DIR_OUT,
1820         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1821 };
1822
1823 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1824         .bLength =              sizeof(uasp_bo_pipe_desc),
1825         .bDescriptorType =      USB_DT_PIPE_USAGE,
1826         .bPipeID =              DATA_OUT_PIPE_ID,
1827 };
1828
1829 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1830         .bLength =              USB_DT_ENDPOINT_SIZE,
1831         .bDescriptorType =      USB_DT_ENDPOINT,
1832         .bEndpointAddress =     USB_DIR_OUT,
1833         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1834         .wMaxPacketSize =       cpu_to_le16(0x400),
1835 };
1836
1837 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1838         .bLength =              sizeof(uasp_bo_ep_comp_desc),
1839         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1840         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1841 };
1842
1843 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1844         .bLength =              sizeof(bot_bo_ep_comp_desc),
1845         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1846 };
1847
1848 static struct usb_endpoint_descriptor uasp_status_desc = {
1849         .bLength =              USB_DT_ENDPOINT_SIZE,
1850         .bDescriptorType =      USB_DT_ENDPOINT,
1851         .bEndpointAddress =     USB_DIR_IN,
1852         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1853         .wMaxPacketSize =       cpu_to_le16(512),
1854 };
1855
1856 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1857         .bLength =              USB_DT_ENDPOINT_SIZE,
1858         .bDescriptorType =      USB_DT_ENDPOINT,
1859         .bEndpointAddress =     USB_DIR_IN,
1860         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1861 };
1862
1863 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1864         .bLength =              sizeof(uasp_status_pipe_desc),
1865         .bDescriptorType =      USB_DT_PIPE_USAGE,
1866         .bPipeID =              STATUS_PIPE_ID,
1867 };
1868
1869 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1870         .bLength =              USB_DT_ENDPOINT_SIZE,
1871         .bDescriptorType =      USB_DT_ENDPOINT,
1872         .bEndpointAddress =     USB_DIR_IN,
1873         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1874         .wMaxPacketSize =       cpu_to_le16(1024),
1875 };
1876
1877 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1878         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
1879         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1880         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1881 };
1882
1883 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1884         .bLength =              USB_DT_ENDPOINT_SIZE,
1885         .bDescriptorType =      USB_DT_ENDPOINT,
1886         .bEndpointAddress =     USB_DIR_OUT,
1887         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1888         .wMaxPacketSize =       cpu_to_le16(512),
1889 };
1890
1891 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1892         .bLength =              USB_DT_ENDPOINT_SIZE,
1893         .bDescriptorType =      USB_DT_ENDPOINT,
1894         .bEndpointAddress =     USB_DIR_OUT,
1895         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1896 };
1897
1898 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1899         .bLength =              sizeof(uasp_cmd_pipe_desc),
1900         .bDescriptorType =      USB_DT_PIPE_USAGE,
1901         .bPipeID =              CMD_PIPE_ID,
1902 };
1903
1904 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1905         .bLength =              USB_DT_ENDPOINT_SIZE,
1906         .bDescriptorType =      USB_DT_ENDPOINT,
1907         .bEndpointAddress =     USB_DIR_OUT,
1908         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1909         .wMaxPacketSize =       cpu_to_le16(1024),
1910 };
1911
1912 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1913         .bLength =              sizeof(uasp_cmd_comp_desc),
1914         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1915 };
1916
1917 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1918         (struct usb_descriptor_header *) &bot_intf_desc,
1919         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1920         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1921
1922         (struct usb_descriptor_header *) &uasp_intf_desc,
1923         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1924         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1925         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1926         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1927         (struct usb_descriptor_header *) &uasp_fs_status_desc,
1928         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1929         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1930         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1931         NULL,
1932 };
1933
1934 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1935         (struct usb_descriptor_header *) &bot_intf_desc,
1936         (struct usb_descriptor_header *) &uasp_bi_desc,
1937         (struct usb_descriptor_header *) &uasp_bo_desc,
1938
1939         (struct usb_descriptor_header *) &uasp_intf_desc,
1940         (struct usb_descriptor_header *) &uasp_bi_desc,
1941         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1942         (struct usb_descriptor_header *) &uasp_bo_desc,
1943         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1944         (struct usb_descriptor_header *) &uasp_status_desc,
1945         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1946         (struct usb_descriptor_header *) &uasp_cmd_desc,
1947         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1948         NULL,
1949 };
1950
1951 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1952         (struct usb_descriptor_header *) &bot_intf_desc,
1953         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1954         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1955         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1956         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1957
1958         (struct usb_descriptor_header *) &uasp_intf_desc,
1959         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1960         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1961         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1962         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1963         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1964         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1965         (struct usb_descriptor_header *) &uasp_ss_status_desc,
1966         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1967         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1968         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1969         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1970         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1971         NULL,
1972 };
1973
1974 static struct usb_string        tcm_us_strings[] = {
1975         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
1976         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
1977         { },
1978 };
1979
1980 static struct usb_gadget_strings tcm_stringtab = {
1981         .language = 0x0409,
1982         .strings = tcm_us_strings,
1983 };
1984
1985 static struct usb_gadget_strings *tcm_strings[] = {
1986         &tcm_stringtab,
1987         NULL,
1988 };
1989
1990 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1991 {
1992         struct f_uas            *fu = to_f_uas(f);
1993         struct usb_string       *us;
1994         struct usb_gadget       *gadget = c->cdev->gadget;
1995         struct usb_ep           *ep;
1996         struct f_tcm_opts       *opts;
1997         int                     iface;
1998         int                     ret;
1999
2000         opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2001
2002         mutex_lock(&opts->dep_lock);
2003         if (!opts->can_attach) {
2004                 mutex_unlock(&opts->dep_lock);
2005                 return -ENODEV;
2006         }
2007         mutex_unlock(&opts->dep_lock);
2008         us = usb_gstrings_attach(c->cdev, tcm_strings,
2009                 ARRAY_SIZE(tcm_us_strings));
2010         if (IS_ERR(us))
2011                 return PTR_ERR(us);
2012         bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2013         uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2014
2015         iface = usb_interface_id(c, f);
2016         if (iface < 0)
2017                 return iface;
2018
2019         bot_intf_desc.bInterfaceNumber = iface;
2020         uasp_intf_desc.bInterfaceNumber = iface;
2021         fu->iface = iface;
2022         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2023                         &uasp_bi_ep_comp_desc);
2024         if (!ep)
2025                 goto ep_fail;
2026
2027         fu->ep_in = ep;
2028
2029         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2030                         &uasp_bo_ep_comp_desc);
2031         if (!ep)
2032                 goto ep_fail;
2033         fu->ep_out = ep;
2034
2035         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2036                         &uasp_status_in_ep_comp_desc);
2037         if (!ep)
2038                 goto ep_fail;
2039         fu->ep_status = ep;
2040
2041         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2042                         &uasp_cmd_comp_desc);
2043         if (!ep)
2044                 goto ep_fail;
2045         fu->ep_cmd = ep;
2046
2047         /* Assume endpoint addresses are the same for both speeds */
2048         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2049         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2050         uasp_status_desc.bEndpointAddress =
2051                 uasp_ss_status_desc.bEndpointAddress;
2052         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2053
2054         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2055         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2056         uasp_fs_status_desc.bEndpointAddress =
2057                 uasp_ss_status_desc.bEndpointAddress;
2058         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2059
2060         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2061                         uasp_hs_function_desc, uasp_ss_function_desc, NULL);
2062         if (ret)
2063                 goto ep_fail;
2064
2065         return 0;
2066 ep_fail:
2067         pr_err("Can't claim all required eps\n");
2068
2069         return -ENOTSUPP;
2070 }
2071
2072 struct guas_setup_wq {
2073         struct work_struct work;
2074         struct f_uas *fu;
2075         unsigned int alt;
2076 };
2077
2078 static void tcm_delayed_set_alt(struct work_struct *wq)
2079 {
2080         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2081                         work);
2082         struct f_uas *fu = work->fu;
2083         int alt = work->alt;
2084
2085         kfree(work);
2086
2087         if (fu->flags & USBG_IS_BOT)
2088                 bot_cleanup_old_alt(fu);
2089         if (fu->flags & USBG_IS_UAS)
2090                 uasp_cleanup_old_alt(fu);
2091
2092         if (alt == USB_G_ALT_INT_BBB)
2093                 bot_set_alt(fu);
2094         else if (alt == USB_G_ALT_INT_UAS)
2095                 uasp_set_alt(fu);
2096         usb_composite_setup_continue(fu->function.config->cdev);
2097 }
2098
2099 static int tcm_get_alt(struct usb_function *f, unsigned intf)
2100 {
2101         if (intf == bot_intf_desc.bInterfaceNumber)
2102                 return USB_G_ALT_INT_BBB;
2103         if (intf == uasp_intf_desc.bInterfaceNumber)
2104                 return USB_G_ALT_INT_UAS;
2105
2106         return -EOPNOTSUPP;
2107 }
2108
2109 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2110 {
2111         struct f_uas *fu = to_f_uas(f);
2112
2113         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2114                 struct guas_setup_wq *work;
2115
2116                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2117                 if (!work)
2118                         return -ENOMEM;
2119                 INIT_WORK(&work->work, tcm_delayed_set_alt);
2120                 work->fu = fu;
2121                 work->alt = alt;
2122                 schedule_work(&work->work);
2123                 return USB_GADGET_DELAYED_STATUS;
2124         }
2125         return -EOPNOTSUPP;
2126 }
2127
2128 static void tcm_disable(struct usb_function *f)
2129 {
2130         struct f_uas *fu = to_f_uas(f);
2131
2132         if (fu->flags & USBG_IS_UAS)
2133                 uasp_cleanup_old_alt(fu);
2134         else if (fu->flags & USBG_IS_BOT)
2135                 bot_cleanup_old_alt(fu);
2136         fu->flags = 0;
2137 }
2138
2139 static int tcm_setup(struct usb_function *f,
2140                 const struct usb_ctrlrequest *ctrl)
2141 {
2142         struct f_uas *fu = to_f_uas(f);
2143
2144         if (!(fu->flags & USBG_IS_BOT))
2145                 return -EOPNOTSUPP;
2146
2147         return usbg_bot_setup(f, ctrl);
2148 }
2149
2150 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
2151 {
2152         return container_of(to_config_group(item), struct f_tcm_opts,
2153                 func_inst.group);
2154 }
2155
2156 static void tcm_attr_release(struct config_item *item)
2157 {
2158         struct f_tcm_opts *opts = to_f_tcm_opts(item);
2159
2160         usb_put_function_instance(&opts->func_inst);
2161 }
2162
2163 static struct configfs_item_operations tcm_item_ops = {
2164         .release                = tcm_attr_release,
2165 };
2166
2167 static const struct config_item_type tcm_func_type = {
2168         .ct_item_ops    = &tcm_item_ops,
2169         .ct_owner       = THIS_MODULE,
2170 };
2171
2172 static void tcm_free_inst(struct usb_function_instance *f)
2173 {
2174         struct f_tcm_opts *opts;
2175         unsigned i;
2176
2177         opts = container_of(f, struct f_tcm_opts, func_inst);
2178
2179         mutex_lock(&tpg_instances_lock);
2180         for (i = 0; i < TPG_INSTANCES; ++i)
2181                 if (tpg_instances[i].func_inst == f)
2182                         break;
2183         if (i < TPG_INSTANCES)
2184                 tpg_instances[i].func_inst = NULL;
2185         mutex_unlock(&tpg_instances_lock);
2186
2187         kfree(opts);
2188 }
2189
2190 static int tcm_register_callback(struct usb_function_instance *f)
2191 {
2192         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2193
2194         mutex_lock(&opts->dep_lock);
2195         opts->can_attach = true;
2196         mutex_unlock(&opts->dep_lock);
2197
2198         return 0;
2199 }
2200
2201 static void tcm_unregister_callback(struct usb_function_instance *f)
2202 {
2203         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2204
2205         mutex_lock(&opts->dep_lock);
2206         unregister_gadget_item(opts->
2207                 func_inst.group.cg_item.ci_parent->ci_parent);
2208         opts->can_attach = false;
2209         mutex_unlock(&opts->dep_lock);
2210 }
2211
2212 static int usbg_attach(struct usbg_tpg *tpg)
2213 {
2214         struct usb_function_instance *f = tpg->fi;
2215         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2216
2217         if (opts->tcm_register_callback)
2218                 return opts->tcm_register_callback(f);
2219
2220         return 0;
2221 }
2222
2223 static void usbg_detach(struct usbg_tpg *tpg)
2224 {
2225         struct usb_function_instance *f = tpg->fi;
2226         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2227
2228         if (opts->tcm_unregister_callback)
2229                 opts->tcm_unregister_callback(f);
2230 }
2231
2232 static int tcm_set_name(struct usb_function_instance *f, const char *name)
2233 {
2234         struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
2235
2236         pr_debug("tcm: Activating %s\n", name);
2237
2238         mutex_lock(&opts->dep_lock);
2239         opts->ready = true;
2240         mutex_unlock(&opts->dep_lock);
2241
2242         return 0;
2243 }
2244
2245 static struct usb_function_instance *tcm_alloc_inst(void)
2246 {
2247         struct f_tcm_opts *opts;
2248         int i;
2249
2250
2251         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2252         if (!opts)
2253                 return ERR_PTR(-ENOMEM);
2254
2255         mutex_lock(&tpg_instances_lock);
2256         for (i = 0; i < TPG_INSTANCES; ++i)
2257                 if (!tpg_instances[i].func_inst)
2258                         break;
2259
2260         if (i == TPG_INSTANCES) {
2261                 mutex_unlock(&tpg_instances_lock);
2262                 kfree(opts);
2263                 return ERR_PTR(-EBUSY);
2264         }
2265         tpg_instances[i].func_inst = &opts->func_inst;
2266         mutex_unlock(&tpg_instances_lock);
2267
2268         mutex_init(&opts->dep_lock);
2269         opts->func_inst.set_inst_name = tcm_set_name;
2270         opts->func_inst.free_func_inst = tcm_free_inst;
2271         opts->tcm_register_callback = tcm_register_callback;
2272         opts->tcm_unregister_callback = tcm_unregister_callback;
2273
2274         config_group_init_type_name(&opts->func_inst.group, "",
2275                         &tcm_func_type);
2276
2277         return &opts->func_inst;
2278 }
2279
2280 static void tcm_free(struct usb_function *f)
2281 {
2282         struct f_uas *tcm = to_f_uas(f);
2283
2284         kfree(tcm);
2285 }
2286
2287 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
2288 {
2289         usb_free_all_descriptors(f);
2290 }
2291
2292 static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
2293 {
2294         struct f_uas *fu;
2295         unsigned i;
2296
2297         mutex_lock(&tpg_instances_lock);
2298         for (i = 0; i < TPG_INSTANCES; ++i)
2299                 if (tpg_instances[i].func_inst == fi)
2300                         break;
2301         if (i == TPG_INSTANCES) {
2302                 mutex_unlock(&tpg_instances_lock);
2303                 return ERR_PTR(-ENODEV);
2304         }
2305
2306         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2307         if (!fu) {
2308                 mutex_unlock(&tpg_instances_lock);
2309                 return ERR_PTR(-ENOMEM);
2310         }
2311
2312         fu->function.name = "Target Function";
2313         fu->function.bind = tcm_bind;
2314         fu->function.unbind = tcm_unbind;
2315         fu->function.set_alt = tcm_set_alt;
2316         fu->function.get_alt = tcm_get_alt;
2317         fu->function.setup = tcm_setup;
2318         fu->function.disable = tcm_disable;
2319         fu->function.free_func = tcm_free;
2320         fu->tpg = tpg_instances[i].tpg;
2321         mutex_unlock(&tpg_instances_lock);
2322
2323         return &fu->function;
2324 }
2325
2326 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
2327
2328 static int tcm_init(void)
2329 {
2330         int ret;
2331
2332         ret = usb_function_register(&tcmusb_func);
2333         if (ret)
2334                 return ret;
2335
2336         ret = target_register_template(&usbg_ops);
2337         if (ret)
2338                 usb_function_unregister(&tcmusb_func);
2339
2340         return ret;
2341 }
2342 module_init(tcm_init);
2343
2344 static void tcm_exit(void)
2345 {
2346         target_unregister_template(&usbg_ops);
2347         usb_function_unregister(&tcmusb_func);
2348 }
2349 module_exit(tcm_exit);
2350
2351 MODULE_LICENSE("GPL");
2352 MODULE_AUTHOR("Sebastian Andrzej Siewior");