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_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB);
 396         ret = usb_ep_enable(fu->ep_in);
 397         if (ret)
 398                 goto err_b_in;
 399
 400         config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB);
 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
 757 err_sts:
 758         usb_ep_free_request(fu->ep_out, stream->req_out);
 759         stream->req_out = NULL;
 760 err_out:
 761         usb_ep_free_request(fu->ep_in, stream->req_in);
 762         stream->req_in = NULL;
 763 out:
 764         return -ENOMEM;
 765 }
 766
 767 static int uasp_alloc_cmd(struct f_uas *fu)
 768 {
 769         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 770         if (!fu->cmd.req)
 771                 goto err;
 772
 773         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 774         if (!fu->cmd.buf)
 775                 goto err_buf;
 776
 777         fu->cmd.req->complete = uasp_cmd_complete;
 778         fu->cmd.req->buf = fu->cmd.buf;
 779         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 780         fu->cmd.req->context = fu;
 781         return 0;
 782
 783 err_buf:
 784         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 785 err:
 786         return -ENOMEM;
 787 }
 788
 789 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 790 {
 791         int i;
 792
 793         for (i = 0; i < max_streams; i++) {
 794                 struct uas_stream *s = &fu->stream[i];
 795
 796                 s->req_in->stream_id = i + 1;
 797                 s->req_out->stream_id = i + 1;
 798                 s->req_status->stream_id = i + 1;
 799         }
 800 }
 801
 802 static int uasp_prepare_reqs(struct f_uas *fu)
 803 {
 804         int ret;
 805         int i;
 806         int max_streams;
 807
 808         if (fu->flags & USBG_USE_STREAMS)
 809                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 810         else
 811                 max_streams = 1;
 812
 813         for (i = 0; i < max_streams; i++) {
 814                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 815                 if (ret)
 816                         goto err_cleanup;
 817         }
 818
 819         ret = uasp_alloc_cmd(fu);
 820         if (ret)
 821                 goto err_free_stream;
 822         uasp_setup_stream_res(fu, max_streams);
 823
 824         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 825         if (ret)
 826                 goto err_free_stream;
 827
 828         return 0;
 829
 830 err_free_stream:
 831         uasp_free_cmdreq(fu);
 832
 833 err_cleanup:
 834         if (i) {
 835                 do {
 836                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 837                         i--;
 838                 } while (i);
 839         }
 840         pr_err("UASP: endpoint setup failed\n");
 841         return ret;
 842 }
 843
 844 static void uasp_set_alt(struct f_uas *fu)
 845 {
 846         struct usb_function *f = &fu->function;
 847         struct usb_gadget *gadget = f->config->cdev->gadget;
 848         int ret;
 849
 850         fu->flags = USBG_IS_UAS;
 851
 852         if (gadget->speed >= USB_SPEED_SUPER)
 853                 fu->flags |= USBG_USE_STREAMS;
 854
 855         config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS);
 856         ret = usb_ep_enable(fu->ep_in);
 857         if (ret)
 858                 goto err_b_in;
 859
 860         config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS);
 861         ret = usb_ep_enable(fu->ep_out);
 862         if (ret)
 863                 goto err_b_out;
 864
 865         config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS);
 866         ret = usb_ep_enable(fu->ep_cmd);
 867         if (ret)
 868                 goto err_cmd;
 869         config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS);
 870         ret = usb_ep_enable(fu->ep_status);
 871         if (ret)
 872                 goto err_status;
 873
 874         ret = uasp_prepare_reqs(fu);
 875         if (ret)
 876                 goto err_wq;
 877         fu->flags |= USBG_ENABLED;
 878
 879         pr_info("Using the UAS protocol\n");
 880         return;
 881 err_wq:
 882         usb_ep_disable(fu->ep_status);
 883 err_status:
 884         usb_ep_disable(fu->ep_cmd);
 885 err_cmd:
 886         usb_ep_disable(fu->ep_out);
 887 err_b_out:
 888         usb_ep_disable(fu->ep_in);
 889 err_b_in:
 890         fu->flags = 0;
 891 }
 892
 893 static int get_cmd_dir(const unsigned char *cdb)
 894 {
 895         int ret;
 896
 897         switch (cdb[0]) {
 898         case READ_6:
 899         case READ_10:
 900         case READ_12:
 901         case READ_16:
 902         case INQUIRY:
 903         case MODE_SENSE:
 904         case MODE_SENSE_10:
 905         case SERVICE_ACTION_IN_16:
 906         case MAINTENANCE_IN:
 907         case PERSISTENT_RESERVE_IN:
 908         case SECURITY_PROTOCOL_IN:
 909         case ACCESS_CONTROL_IN:
 910         case REPORT_LUNS:
 911         case READ_BLOCK_LIMITS:
 912         case READ_POSITION:
 913         case READ_CAPACITY:
 914         case READ_TOC:
 915         case READ_FORMAT_CAPACITIES:
 916         case REQUEST_SENSE:
 917                 ret = DMA_FROM_DEVICE;
 918                 break;
 919
 920         case WRITE_6:
 921         case WRITE_10:
 922         case WRITE_12:
 923         case WRITE_16:
 924         case MODE_SELECT:
 925         case MODE_SELECT_10:
 926         case WRITE_VERIFY:
 927         case WRITE_VERIFY_12:
 928         case PERSISTENT_RESERVE_OUT:
 929         case MAINTENANCE_OUT:
 930         case SECURITY_PROTOCOL_OUT:
 931         case ACCESS_CONTROL_OUT:
 932                 ret = DMA_TO_DEVICE;
 933                 break;
 934         case ALLOW_MEDIUM_REMOVAL:
 935         case TEST_UNIT_READY:
 936         case SYNCHRONIZE_CACHE:
 937         case START_STOP:
 938         case ERASE:
 939         case REZERO_UNIT:
 940         case SEEK_10:
 941         case SPACE:
 942         case VERIFY:
 943         case WRITE_FILEMARKS:
 944                 ret = DMA_NONE;
 945                 break;
 946         default:
 947 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
 948                 pr_warn(CMD_DIR_MSG, cdb[0]);
 949 #undef CMD_DIR_MSG
 950                 ret = -EINVAL;
 951         }
 952         return ret;
 953 }
 954
 955 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 956 {
 957         struct usbg_cmd *cmd = req->context;
 958         struct se_cmd *se_cmd = &cmd->se_cmd;
 959
 960         if (req->status < 0) {
 961                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 962                 goto cleanup;
 963         }
 964
 965         if (req->num_sgs == 0) {
 966                 sg_copy_from_buffer(se_cmd->t_data_sg,
 967                                 se_cmd->t_data_nents,
 968                                 cmd->data_buf,
 969                                 se_cmd->data_length);
 970         }
 971
 972         complete(&cmd->write_complete);
 973         return;
 974
 975 cleanup:
 976         transport_generic_free_cmd(&cmd->se_cmd, 0);
 977 }
 978
 979 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 980 {
 981         struct se_cmd *se_cmd = &cmd->se_cmd;
 982         struct f_uas *fu = cmd->fu;
 983         struct usb_gadget *gadget = fuas_to_gadget(fu);
 984
 985         if (!gadget->sg_supported) {
 986                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 987                 if (!cmd->data_buf)
 988                         return -ENOMEM;
 989
 990                 req->buf = cmd->data_buf;
 991         } else {
 992                 req->buf = NULL;
 993                 req->num_sgs = se_cmd->t_data_nents;
 994                 req->sg = se_cmd->t_data_sg;
 995         }
 996
 997         req->is_last = 1;
 998         req->complete = usbg_data_write_cmpl;
 999         req->length = se_cmd->data_length;
1000         req->context = cmd;
1001         return 0;
1002 }
1003
1004 static int usbg_send_status_response(struct se_cmd *se_cmd)
1005 {
1006         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1007                         se_cmd);
1008         struct f_uas *fu = cmd->fu;
1009
1010         if (fu->flags & USBG_IS_BOT)
1011                 return bot_send_status_response(cmd);
1012         else
1013                 return uasp_send_status_response(cmd);
1014 }
1015
1016 static int usbg_send_write_request(struct se_cmd *se_cmd)
1017 {
1018         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1019                         se_cmd);
1020         struct f_uas *fu = cmd->fu;
1021
1022         if (fu->flags & USBG_IS_BOT)
1023                 return bot_send_write_request(cmd);
1024         else
1025                 return uasp_send_write_request(cmd);
1026 }
1027
1028 static int usbg_send_read_response(struct se_cmd *se_cmd)
1029 {
1030         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1031                         se_cmd);
1032         struct f_uas *fu = cmd->fu;
1033
1034         if (fu->flags & USBG_IS_BOT)
1035                 return bot_send_read_response(cmd);
1036         else
1037                 return uasp_send_read_response(cmd);
1038 }
1039
1040 static void usbg_cmd_work(struct work_struct *work)
1041 {
1042         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1043         struct se_cmd *se_cmd;
1044         struct tcm_usbg_nexus *tv_nexus;
1045         struct usbg_tpg *tpg;
1046         int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF);
1047
1048         se_cmd = &cmd->se_cmd;
1049         tpg = cmd->fu->tpg;
1050         tv_nexus = tpg->tpg_nexus;
1051         dir = get_cmd_dir(cmd->cmd_buf);
1052         if (dir < 0) {
1053                 __target_init_cmd(se_cmd,
1054                                   tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1055                                   tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1056                                   cmd->prio_attr, cmd->sense_iu.sense,
1057                                   cmd->unpacked_lun);
1058                 goto out;
1059         }
1060
1061         target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
1062                           cmd->sense_iu.sense, cmd->unpacked_lun, 0,
1063                           cmd->prio_attr, dir, flags);
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                 fallthrough;
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                 __target_init_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                                   cmd->unpacked_lun);
1187                 goto out;
1188         }
1189
1190         target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1191                           cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1192                           cmd->data_len, cmd->prio_attr, dir, 0);
1193         return;
1194
1195 out:
1196         transport_send_check_condition_and_sense(se_cmd,
1197                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1198         transport_generic_free_cmd(&cmd->se_cmd, 0);
1199 }
1200
1201 static int bot_submit_command(struct f_uas *fu,
1202                 void *cmdbuf, unsigned int len)
1203 {
1204         struct bulk_cb_wrap *cbw = cmdbuf;
1205         struct usbg_cmd *cmd;
1206         struct usbg_tpg *tpg = fu->tpg;
1207         struct tcm_usbg_nexus *tv_nexus;
1208         u32 cmd_len;
1209
1210         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1211                 pr_err("Wrong signature on CBW\n");
1212                 return -EINVAL;
1213         }
1214         if (len != 31) {
1215                 pr_err("Wrong length for CBW\n");
1216                 return -EINVAL;
1217         }
1218
1219         cmd_len = cbw->Length;
1220         if (cmd_len < 1 || cmd_len > 16)
1221                 return -EINVAL;
1222
1223         tv_nexus = tpg->tpg_nexus;
1224         if (!tv_nexus) {
1225                 pr_err("Missing nexus, ignoring command\n");
1226                 return -ENODEV;
1227         }
1228
1229         cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag);
1230         if (IS_ERR(cmd)) {
1231                 pr_err("usbg_get_cmd failed\n");
1232                 return -ENOMEM;
1233         }
1234         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1235
1236         cmd->bot_tag = cbw->Tag;
1237         cmd->prio_attr = TCM_SIMPLE_TAG;
1238         cmd->unpacked_lun = cbw->Lun;
1239         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1240         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1241         cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
1242
1243         INIT_WORK(&cmd->work, bot_cmd_work);
1244         queue_work(tpg->workqueue, &cmd->work);
1245
1246         return 0;
1247 }
1248
1249 /* Start fabric.c code */
1250
1251 static int usbg_check_true(struct se_portal_group *se_tpg)
1252 {
1253         return 1;
1254 }
1255
1256 static int usbg_check_false(struct se_portal_group *se_tpg)
1257 {
1258         return 0;
1259 }
1260
1261 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1262 {
1263         struct usbg_tpg *tpg = container_of(se_tpg,
1264                                 struct usbg_tpg, se_tpg);
1265         struct usbg_tport *tport = tpg->tport;
1266
1267         return &tport->tport_name[0];
1268 }
1269
1270 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1271 {
1272         struct usbg_tpg *tpg = container_of(se_tpg,
1273                                 struct usbg_tpg, se_tpg);
1274         return tpg->tport_tpgt;
1275 }
1276
1277 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1278 {
1279         return 1;
1280 }
1281
1282 static void usbg_release_cmd(struct se_cmd *se_cmd)
1283 {
1284         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1285                         se_cmd);
1286         struct se_session *se_sess = se_cmd->se_sess;
1287
1288         kfree(cmd->data_buf);
1289         target_free_tag(se_sess, se_cmd);
1290 }
1291
1292 static u32 usbg_sess_get_index(struct se_session *se_sess)
1293 {
1294         return 0;
1295 }
1296
1297 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1298 {
1299 }
1300
1301 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1302 {
1303         return 0;
1304 }
1305
1306 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1307 {
1308 }
1309
1310 static void usbg_aborted_task(struct se_cmd *se_cmd)
1311 {
1312 }
1313
1314 static const char *usbg_check_wwn(const char *name)
1315 {
1316         const char *n;
1317         unsigned int len;
1318
1319         n = strstr(name, "naa.");
1320         if (!n)
1321                 return NULL;
1322         n += 4;
1323         len = strlen(n);
1324         if (len == 0 || len > USBG_NAMELEN - 1)
1325                 return NULL;
1326         return n;
1327 }
1328
1329 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1330 {
1331         if (!usbg_check_wwn(name))
1332                 return -EINVAL;
1333         return 0;
1334 }
1335
1336 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
1337                                              const char *name)
1338 {
1339         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1340                         tport_wwn);
1341         struct usbg_tpg *tpg;
1342         unsigned long tpgt;
1343         int ret;
1344         struct f_tcm_opts *opts;
1345         unsigned i;
1346
1347         if (strstr(name, "tpgt_") != name)
1348                 return ERR_PTR(-EINVAL);
1349         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1350                 return ERR_PTR(-EINVAL);
1351         ret = -ENODEV;
1352         mutex_lock(&tpg_instances_lock);
1353         for (i = 0; i < TPG_INSTANCES; ++i)
1354                 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
1355                         break;
1356         if (i == TPG_INSTANCES)
1357                 goto unlock_inst;
1358
1359         opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
1360                 func_inst);
1361         mutex_lock(&opts->dep_lock);
1362         if (!opts->ready)
1363                 goto unlock_dep;
1364
1365         if (opts->has_dep) {
1366                 if (!try_module_get(opts->dependent))
1367                         goto unlock_dep;
1368         } else {
1369                 ret = configfs_depend_item_unlocked(
1370                         wwn->wwn_group.cg_subsys,
1371                         &opts->func_inst.group.cg_item);
1372                 if (ret)
1373                         goto unlock_dep;
1374         }
1375
1376         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1377         ret = -ENOMEM;
1378         if (!tpg)
1379                 goto unref_dep;
1380         mutex_init(&tpg->tpg_mutex);
1381         atomic_set(&tpg->tpg_port_count, 0);
1382         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1383         if (!tpg->workqueue)
1384                 goto free_tpg;
1385
1386         tpg->tport = tport;
1387         tpg->tport_tpgt = tpgt;
1388
1389         /*
1390          * SPC doesn't assign a protocol identifier for USB-SCSI, so we
1391          * pretend to be SAS..
1392          */
1393         ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
1394         if (ret < 0)
1395                 goto free_workqueue;
1396
1397         tpg_instances[i].tpg = tpg;
1398         tpg->fi = tpg_instances[i].func_inst;
1399         mutex_unlock(&opts->dep_lock);
1400         mutex_unlock(&tpg_instances_lock);
1401         return &tpg->se_tpg;
1402
1403 free_workqueue:
1404         destroy_workqueue(tpg->workqueue);
1405 free_tpg:
1406         kfree(tpg);
1407 unref_dep:
1408         if (opts->has_dep)
1409                 module_put(opts->dependent);
1410         else
1411                 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
1412 unlock_dep:
1413         mutex_unlock(&opts->dep_lock);
1414 unlock_inst:
1415         mutex_unlock(&tpg_instances_lock);
1416
1417         return ERR_PTR(ret);
1418 }
1419
1420 static int tcm_usbg_drop_nexus(struct usbg_tpg *);
1421
1422 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1423 {
1424         struct usbg_tpg *tpg = container_of(se_tpg,
1425                                 struct usbg_tpg, se_tpg);
1426         unsigned i;
1427         struct f_tcm_opts *opts;
1428
1429         tcm_usbg_drop_nexus(tpg);
1430         core_tpg_deregister(se_tpg);
1431         destroy_workqueue(tpg->workqueue);
1432
1433         mutex_lock(&tpg_instances_lock);
1434         for (i = 0; i < TPG_INSTANCES; ++i)
1435                 if (tpg_instances[i].tpg == tpg)
1436                         break;
1437         if (i < TPG_INSTANCES) {
1438                 tpg_instances[i].tpg = NULL;
1439                 opts = container_of(tpg_instances[i].func_inst,
1440                         struct f_tcm_opts, func_inst);
1441                 mutex_lock(&opts->dep_lock);
1442                 if (opts->has_dep)
1443                         module_put(opts->dependent);
1444                 else
1445                         configfs_undepend_item_unlocked(
1446                                 &opts->func_inst.group.cg_item);
1447                 mutex_unlock(&opts->dep_lock);
1448         }
1449         mutex_unlock(&tpg_instances_lock);
1450
1451         kfree(tpg);
1452 }
1453
1454 static struct se_wwn *usbg_make_tport(
1455         struct target_fabric_configfs *tf,
1456         struct config_group *group,
1457         const char *name)
1458 {
1459         struct usbg_tport *tport;
1460         const char *wnn_name;
1461         u64 wwpn = 0;
1462
1463         wnn_name = usbg_check_wwn(name);
1464         if (!wnn_name)
1465                 return ERR_PTR(-EINVAL);
1466
1467         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1468         if (!(tport))
1469                 return ERR_PTR(-ENOMEM);
1470
1471         tport->tport_wwpn = wwpn;
1472         snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1473         return &tport->tport_wwn;
1474 }
1475
1476 static void usbg_drop_tport(struct se_wwn *wwn)
1477 {
1478         struct usbg_tport *tport = container_of(wwn,
1479                                 struct usbg_tport, tport_wwn);
1480         kfree(tport);
1481 }
1482
1483 /*
1484  * If somebody feels like dropping the version property, go ahead.
1485  */
1486 static ssize_t usbg_wwn_version_show(struct config_item *item,  char *page)
1487 {
1488         return sprintf(page, "usb-gadget fabric module\n");
1489 }
1490
1491 CONFIGFS_ATTR_RO(usbg_wwn_, version);
1492
1493 static struct configfs_attribute *usbg_wwn_attrs[] = {
1494         &usbg_wwn_attr_version,
1495         NULL,
1496 };
1497
1498 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
1499 {
1500         struct se_portal_group *se_tpg = to_tpg(item);
1501         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1502
1503         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1504 }
1505
1506 static int usbg_attach(struct usbg_tpg *);
1507 static void usbg_detach(struct usbg_tpg *);
1508
1509 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
1510                 const char *page, size_t count)
1511 {
1512         struct se_portal_group *se_tpg = to_tpg(item);
1513         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1514         bool op;
1515         ssize_t ret;
1516
1517         ret = strtobool(page, &op);
1518         if (ret)
1519                 return ret;
1520
1521         if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
1522                 return -EINVAL;
1523
1524         if (op)
1525                 ret = usbg_attach(tpg);
1526         else
1527                 usbg_detach(tpg);
1528         if (ret)
1529                 return ret;
1530
1531         tpg->gadget_connect = op;
1532
1533         return count;
1534 }
1535
1536 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
1537 {
1538         struct se_portal_group *se_tpg = to_tpg(item);
1539         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1540         struct tcm_usbg_nexus *tv_nexus;
1541         ssize_t ret;
1542
1543         mutex_lock(&tpg->tpg_mutex);
1544         tv_nexus = tpg->tpg_nexus;
1545         if (!tv_nexus) {
1546                 ret = -ENODEV;
1547                 goto out;
1548         }
1549         ret = snprintf(page, PAGE_SIZE, "%s\n",
1550                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1551 out:
1552         mutex_unlock(&tpg->tpg_mutex);
1553         return ret;
1554 }
1555
1556 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg,
1557                               struct se_session *se_sess, void *p)
1558 {
1559         struct usbg_tpg *tpg = container_of(se_tpg,
1560                                 struct usbg_tpg, se_tpg);
1561
1562         tpg->tpg_nexus = p;
1563         return 0;
1564 }
1565
1566 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1567 {
1568         struct tcm_usbg_nexus *tv_nexus;
1569         int ret = 0;
1570
1571         mutex_lock(&tpg->tpg_mutex);
1572         if (tpg->tpg_nexus) {
1573                 ret = -EEXIST;
1574                 pr_debug("tpg->tpg_nexus already exists\n");
1575                 goto out_unlock;
1576         }
1577
1578         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1579         if (!tv_nexus) {
1580                 ret = -ENOMEM;
1581                 goto out_unlock;
1582         }
1583
1584         tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1585                                                      USB_G_DEFAULT_SESSION_TAGS,
1586                                                      sizeof(struct usbg_cmd),
1587                                                      TARGET_PROT_NORMAL, name,
1588                                                      tv_nexus, usbg_alloc_sess_cb);
1589         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1590 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
1591                 pr_debug(MAKE_NEXUS_MSG, name);
1592 #undef MAKE_NEXUS_MSG
1593                 ret = PTR_ERR(tv_nexus->tvn_se_sess);
1594                 kfree(tv_nexus);
1595         }
1596
1597 out_unlock:
1598         mutex_unlock(&tpg->tpg_mutex);
1599         return ret;
1600 }
1601
1602 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1603 {
1604         struct se_session *se_sess;
1605         struct tcm_usbg_nexus *tv_nexus;
1606         int ret = -ENODEV;
1607
1608         mutex_lock(&tpg->tpg_mutex);
1609         tv_nexus = tpg->tpg_nexus;
1610         if (!tv_nexus)
1611                 goto out;
1612
1613         se_sess = tv_nexus->tvn_se_sess;
1614         if (!se_sess)
1615                 goto out;
1616
1617         if (atomic_read(&tpg->tpg_port_count)) {
1618                 ret = -EPERM;
1619 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
1620                 pr_err(MSG, atomic_read(&tpg->tpg_port_count));
1621 #undef MSG
1622                 goto out;
1623         }
1624
1625         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1626                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1627         /*
1628          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1629          */
1630         target_remove_session(se_sess);
1631         tpg->tpg_nexus = NULL;
1632
1633         kfree(tv_nexus);
1634         ret = 0;
1635 out:
1636         mutex_unlock(&tpg->tpg_mutex);
1637         return ret;
1638 }
1639
1640 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
1641                 const char *page, size_t count)
1642 {
1643         struct se_portal_group *se_tpg = to_tpg(item);
1644         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1645         unsigned char i_port[USBG_NAMELEN], *ptr;
1646         int ret;
1647
1648         if (!strncmp(page, "NULL", 4)) {
1649                 ret = tcm_usbg_drop_nexus(tpg);
1650                 return (!ret) ? count : ret;
1651         }
1652         if (strlen(page) >= USBG_NAMELEN) {
1653
1654 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
1655                 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
1656 #undef NEXUS_STORE_MSG
1657                 return -EINVAL;
1658         }
1659         snprintf(i_port, USBG_NAMELEN, "%s", page);
1660
1661         ptr = strstr(i_port, "naa.");
1662         if (!ptr) {
1663                 pr_err("Missing 'naa.' prefix\n");
1664                 return -EINVAL;
1665         }
1666
1667         if (i_port[strlen(i_port) - 1] == '\n')
1668                 i_port[strlen(i_port) - 1] = '\0';
1669
1670         ret = tcm_usbg_make_nexus(tpg, &i_port[0]);
1671         if (ret < 0)
1672                 return ret;
1673         return count;
1674 }
1675
1676 CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
1677 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
1678
1679 static struct configfs_attribute *usbg_base_attrs[] = {
1680         &tcm_usbg_tpg_attr_enable,
1681         &tcm_usbg_tpg_attr_nexus,
1682         NULL,
1683 };
1684
1685 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1686 {
1687         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1688
1689         atomic_inc(&tpg->tpg_port_count);
1690         smp_mb__after_atomic();
1691         return 0;
1692 }
1693
1694 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1695                 struct se_lun *se_lun)
1696 {
1697         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1698
1699         atomic_dec(&tpg->tpg_port_count);
1700         smp_mb__after_atomic();
1701 }
1702
1703 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1704 {
1705         return target_put_sess_cmd(se_cmd);
1706 }
1707
1708 static const struct target_core_fabric_ops usbg_ops = {
1709         .module                         = THIS_MODULE,
1710         .fabric_name                    = "usb_gadget",
1711         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1712         .tpg_get_tag                    = usbg_get_tag,
1713         .tpg_check_demo_mode            = usbg_check_true,
1714         .tpg_check_demo_mode_cache      = usbg_check_false,
1715         .tpg_check_demo_mode_write_protect = usbg_check_false,
1716         .tpg_check_prod_mode_write_protect = usbg_check_false,
1717         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1718         .release_cmd                    = usbg_release_cmd,
1719         .sess_get_index                 = usbg_sess_get_index,
1720         .sess_get_initiator_sid         = NULL,
1721         .write_pending                  = usbg_send_write_request,
1722         .set_default_node_attributes    = usbg_set_default_node_attrs,
1723         .get_cmd_state                  = usbg_get_cmd_state,
1724         .queue_data_in                  = usbg_send_read_response,
1725         .queue_status                   = usbg_send_status_response,
1726         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1727         .aborted_task                   = usbg_aborted_task,
1728         .check_stop_free                = usbg_check_stop_free,
1729
1730         .fabric_make_wwn                = usbg_make_tport,
1731         .fabric_drop_wwn                = usbg_drop_tport,
1732         .fabric_make_tpg                = usbg_make_tpg,
1733         .fabric_drop_tpg                = usbg_drop_tpg,
1734         .fabric_post_link               = usbg_port_link,
1735         .fabric_pre_unlink              = usbg_port_unlink,
1736         .fabric_init_nodeacl            = usbg_init_nodeacl,
1737
1738         .tfc_wwn_attrs                  = usbg_wwn_attrs,
1739         .tfc_tpg_base_attrs             = usbg_base_attrs,
1740 };
1741
1742 /* Start gadget.c code */
1743
1744 static struct usb_interface_descriptor bot_intf_desc = {
1745         .bLength =              sizeof(bot_intf_desc),
1746         .bDescriptorType =      USB_DT_INTERFACE,
1747         .bNumEndpoints =        2,
1748         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1749         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1750         .bInterfaceSubClass =   USB_SC_SCSI,
1751         .bInterfaceProtocol =   USB_PR_BULK,
1752 };
1753
1754 static struct usb_interface_descriptor uasp_intf_desc = {
1755         .bLength =              sizeof(uasp_intf_desc),
1756         .bDescriptorType =      USB_DT_INTERFACE,
1757         .bNumEndpoints =        4,
1758         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1759         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1760         .bInterfaceSubClass =   USB_SC_SCSI,
1761         .bInterfaceProtocol =   USB_PR_UAS,
1762 };
1763
1764 static struct usb_endpoint_descriptor uasp_bi_desc = {
1765         .bLength =              USB_DT_ENDPOINT_SIZE,
1766         .bDescriptorType =      USB_DT_ENDPOINT,
1767         .bEndpointAddress =     USB_DIR_IN,
1768         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1769         .wMaxPacketSize =       cpu_to_le16(512),
1770 };
1771
1772 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1773         .bLength =              USB_DT_ENDPOINT_SIZE,
1774         .bDescriptorType =      USB_DT_ENDPOINT,
1775         .bEndpointAddress =     USB_DIR_IN,
1776         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1777 };
1778
1779 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1780         .bLength =              sizeof(uasp_bi_pipe_desc),
1781         .bDescriptorType =      USB_DT_PIPE_USAGE,
1782         .bPipeID =              DATA_IN_PIPE_ID,
1783 };
1784
1785 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1786         .bLength =              USB_DT_ENDPOINT_SIZE,
1787         .bDescriptorType =      USB_DT_ENDPOINT,
1788         .bEndpointAddress =     USB_DIR_IN,
1789         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1790         .wMaxPacketSize =       cpu_to_le16(1024),
1791 };
1792
1793 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
1794         .bLength =              sizeof(uasp_bi_ep_comp_desc),
1795         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1796         .bMaxBurst =            0,
1797         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1798         .wBytesPerInterval =    0,
1799 };
1800
1801 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
1802         .bLength =              sizeof(bot_bi_ep_comp_desc),
1803         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1804         .bMaxBurst =            0,
1805 };
1806
1807 static struct usb_endpoint_descriptor uasp_bo_desc = {
1808         .bLength =              USB_DT_ENDPOINT_SIZE,
1809         .bDescriptorType =      USB_DT_ENDPOINT,
1810         .bEndpointAddress =     USB_DIR_OUT,
1811         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1812         .wMaxPacketSize =       cpu_to_le16(512),
1813 };
1814
1815 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
1816         .bLength =              USB_DT_ENDPOINT_SIZE,
1817         .bDescriptorType =      USB_DT_ENDPOINT,
1818         .bEndpointAddress =     USB_DIR_OUT,
1819         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1820 };
1821
1822 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
1823         .bLength =              sizeof(uasp_bo_pipe_desc),
1824         .bDescriptorType =      USB_DT_PIPE_USAGE,
1825         .bPipeID =              DATA_OUT_PIPE_ID,
1826 };
1827
1828 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
1829         .bLength =              USB_DT_ENDPOINT_SIZE,
1830         .bDescriptorType =      USB_DT_ENDPOINT,
1831         .bEndpointAddress =     USB_DIR_OUT,
1832         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1833         .wMaxPacketSize =       cpu_to_le16(0x400),
1834 };
1835
1836 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
1837         .bLength =              sizeof(uasp_bo_ep_comp_desc),
1838         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1839         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1840 };
1841
1842 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
1843         .bLength =              sizeof(bot_bo_ep_comp_desc),
1844         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1845 };
1846
1847 static struct usb_endpoint_descriptor uasp_status_desc = {
1848         .bLength =              USB_DT_ENDPOINT_SIZE,
1849         .bDescriptorType =      USB_DT_ENDPOINT,
1850         .bEndpointAddress =     USB_DIR_IN,
1851         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1852         .wMaxPacketSize =       cpu_to_le16(512),
1853 };
1854
1855 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
1856         .bLength =              USB_DT_ENDPOINT_SIZE,
1857         .bDescriptorType =      USB_DT_ENDPOINT,
1858         .bEndpointAddress =     USB_DIR_IN,
1859         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1860 };
1861
1862 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
1863         .bLength =              sizeof(uasp_status_pipe_desc),
1864         .bDescriptorType =      USB_DT_PIPE_USAGE,
1865         .bPipeID =              STATUS_PIPE_ID,
1866 };
1867
1868 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
1869         .bLength =              USB_DT_ENDPOINT_SIZE,
1870         .bDescriptorType =      USB_DT_ENDPOINT,
1871         .bEndpointAddress =     USB_DIR_IN,
1872         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1873         .wMaxPacketSize =       cpu_to_le16(1024),
1874 };
1875
1876 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
1877         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
1878         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1879         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
1880 };
1881
1882 static struct usb_endpoint_descriptor uasp_cmd_desc = {
1883         .bLength =              USB_DT_ENDPOINT_SIZE,
1884         .bDescriptorType =      USB_DT_ENDPOINT,
1885         .bEndpointAddress =     USB_DIR_OUT,
1886         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1887         .wMaxPacketSize =       cpu_to_le16(512),
1888 };
1889
1890 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
1891         .bLength =              USB_DT_ENDPOINT_SIZE,
1892         .bDescriptorType =      USB_DT_ENDPOINT,
1893         .bEndpointAddress =     USB_DIR_OUT,
1894         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1895 };
1896
1897 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
1898         .bLength =              sizeof(uasp_cmd_pipe_desc),
1899         .bDescriptorType =      USB_DT_PIPE_USAGE,
1900         .bPipeID =              CMD_PIPE_ID,
1901 };
1902
1903 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
1904         .bLength =              USB_DT_ENDPOINT_SIZE,
1905         .bDescriptorType =      USB_DT_ENDPOINT,
1906         .bEndpointAddress =     USB_DIR_OUT,
1907         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1908         .wMaxPacketSize =       cpu_to_le16(1024),
1909 };
1910
1911 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
1912         .bLength =              sizeof(uasp_cmd_comp_desc),
1913         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
1914 };
1915
1916 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
1917         (struct usb_descriptor_header *) &bot_intf_desc,
1918         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1919         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1920
1921         (struct usb_descriptor_header *) &uasp_intf_desc,
1922         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
1923         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1924         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
1925         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1926         (struct usb_descriptor_header *) &uasp_fs_status_desc,
1927         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1928         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
1929         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1930         NULL,
1931 };
1932
1933 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
1934         (struct usb_descriptor_header *) &bot_intf_desc,
1935         (struct usb_descriptor_header *) &uasp_bi_desc,
1936         (struct usb_descriptor_header *) &uasp_bo_desc,
1937
1938         (struct usb_descriptor_header *) &uasp_intf_desc,
1939         (struct usb_descriptor_header *) &uasp_bi_desc,
1940         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1941         (struct usb_descriptor_header *) &uasp_bo_desc,
1942         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1943         (struct usb_descriptor_header *) &uasp_status_desc,
1944         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1945         (struct usb_descriptor_header *) &uasp_cmd_desc,
1946         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1947         NULL,
1948 };
1949
1950 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
1951         (struct usb_descriptor_header *) &bot_intf_desc,
1952         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1953         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
1954         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1955         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
1956
1957         (struct usb_descriptor_header *) &uasp_intf_desc,
1958         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
1959         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
1960         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
1961         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
1962         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
1963         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
1964         (struct usb_descriptor_header *) &uasp_ss_status_desc,
1965         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
1966         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
1967         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
1968         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
1969         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
1970         NULL,
1971 };
1972
1973 static struct usb_string        tcm_us_strings[] = {
1974         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
1975         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
1976         { },
1977 };
1978
1979 static struct usb_gadget_strings tcm_stringtab = {
1980         .language = 0x0409,
1981         .strings = tcm_us_strings,
1982 };
1983
1984 static struct usb_gadget_strings *tcm_strings[] = {
1985         &tcm_stringtab,
1986         NULL,
1987 };
1988
1989 static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
1990 {
1991         struct f_uas            *fu = to_f_uas(f);
1992         struct usb_string       *us;
1993         struct usb_gadget       *gadget = c->cdev->gadget;
1994         struct usb_ep           *ep;
1995         struct f_tcm_opts       *opts;
1996         int                     iface;
1997         int                     ret;
1998
1999         opts = container_of(f->fi, struct f_tcm_opts, func_inst);
2000
2001         mutex_lock(&opts->dep_lock);
2002         if (!opts->can_attach) {
2003                 mutex_unlock(&opts->dep_lock);
2004                 return -ENODEV;
2005         }
2006         mutex_unlock(&opts->dep_lock);
2007         us = usb_gstrings_attach(c->cdev, tcm_strings,
2008                 ARRAY_SIZE(tcm_us_strings));
2009         if (IS_ERR(us))
2010                 return PTR_ERR(us);
2011         bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
2012         uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
2013
2014         iface = usb_interface_id(c, f);
2015         if (iface < 0)
2016                 return iface;
2017
2018         bot_intf_desc.bInterfaceNumber = iface;
2019         uasp_intf_desc.bInterfaceNumber = iface;
2020         fu->iface = iface;
2021         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2022                         &uasp_bi_ep_comp_desc);
2023         if (!ep)
2024                 goto ep_fail;
2025
2026         fu->ep_in = ep;
2027
2028         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2029                         &uasp_bo_ep_comp_desc);
2030         if (!ep)
2031                 goto ep_fail;
2032         fu->ep_out = ep;
2033
2034         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2035                         &uasp_status_in_ep_comp_desc);
2036         if (!ep)
2037                 goto ep_fail;
2038         fu->ep_status = ep;
2039
2040         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2041                         &uasp_cmd_comp_desc);
2042         if (!ep)
2043                 goto ep_fail;
2044         fu->ep_cmd = ep;
2045
2046         /* Assume endpoint addresses are the same for both speeds */
2047         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2048         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2049         uasp_status_desc.bEndpointAddress =
2050                 uasp_ss_status_desc.bEndpointAddress;
2051         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2052
2053         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2054         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2055         uasp_fs_status_desc.bEndpointAddress =
2056                 uasp_ss_status_desc.bEndpointAddress;
2057         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2058
2059         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2060                         uasp_hs_function_desc, uasp_ss_function_desc,
2061                         uasp_ss_function_desc);
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");