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 <linux/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[0].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[0].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 int ret; 248 249 cmd->fu = fu; 250 251 if (!cmd->data_len) { 252 cmd->csw_code = US_BULK_STAT_PHASE; 253 return -EINVAL; 254 } 255 256 ret = usbg_prepare_w_request(cmd, fu->bot_req_out); 257 if (ret) 258 goto cleanup; 259 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); 260 if (ret) 261 pr_err("%s(%d)\n", __func__, __LINE__); 262 263 cleanup: 264 return ret; 265 } 266 267 static int bot_submit_command(struct f_uas *, void *, unsigned int); 268 269 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) 270 { 271 struct f_uas *fu = req->context; 272 int ret; 273 274 fu->flags &= ~USBG_BOT_CMD_PEND; 275 276 if (req->status < 0) 277 return; 278 279 ret = bot_submit_command(fu, req->buf, req->actual); 280 if (ret) 281 pr_err("%s(%d): %d\n", __func__, __LINE__, ret); 282 } 283 284 static int bot_prepare_reqs(struct f_uas *fu) 285 { 286 int ret; 287 288 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 289 if (!fu->bot_req_in) 290 goto err; 291 292 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 293 if (!fu->bot_req_out) 294 goto err_out; 295 296 fu->cmd[0].req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 297 if (!fu->cmd[0].req) 298 goto err_cmd; 299 300 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 301 if (!fu->bot_status.req) 302 goto err_sts; 303 304 fu->bot_status.req->buf = &fu->bot_status.csw; 305 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; 306 fu->bot_status.req->complete = bot_status_complete; 307 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); 308 309 fu->cmd[0].buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); 310 if (!fu->cmd[0].buf) 311 goto err_buf; 312 313 fu->cmd[0].req->complete = bot_cmd_complete; 314 fu->cmd[0].req->buf = fu->cmd[0].buf; 315 fu->cmd[0].req->length = fu->ep_out->maxpacket; 316 fu->cmd[0].req->context = fu; 317 318 ret = bot_enqueue_cmd_cbw(fu); 319 if (ret) 320 goto err_queue; 321 return 0; 322 err_queue: 323 kfree(fu->cmd[0].buf); 324 fu->cmd[0].buf = NULL; 325 err_buf: 326 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 327 err_sts: 328 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 329 fu->cmd[0].req = NULL; 330 err_cmd: 331 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 332 fu->bot_req_out = NULL; 333 err_out: 334 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 335 fu->bot_req_in = NULL; 336 err: 337 pr_err("BOT: endpoint setup failed\n"); 338 return -ENOMEM; 339 } 340 341 static void bot_cleanup_old_alt(struct f_uas *fu) 342 { 343 if (!(fu->flags & USBG_ENABLED)) 344 return; 345 346 usb_ep_disable(fu->ep_in); 347 usb_ep_disable(fu->ep_out); 348 349 if (!fu->bot_req_in) 350 return; 351 352 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 353 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 354 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 355 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 356 357 kfree(fu->cmd[0].buf); 358 359 fu->bot_req_in = NULL; 360 fu->bot_req_out = NULL; 361 fu->cmd[0].req = NULL; 362 fu->bot_status.req = NULL; 363 fu->cmd[0].buf = NULL; 364 } 365 366 static void bot_set_alt(struct f_uas *fu) 367 { 368 struct usb_function *f = &fu->function; 369 struct usb_gadget *gadget = f->config->cdev->gadget; 370 int ret; 371 372 fu->flags = USBG_IS_BOT; 373 374 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB); 375 ret = usb_ep_enable(fu->ep_in); 376 if (ret) 377 goto err_b_in; 378 379 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB); 380 ret = usb_ep_enable(fu->ep_out); 381 if (ret) 382 goto err_b_out; 383 384 ret = bot_prepare_reqs(fu); 385 if (ret) 386 goto err_wq; 387 fu->flags |= USBG_ENABLED; 388 pr_info("Using the BOT protocol\n"); 389 return; 390 err_wq: 391 usb_ep_disable(fu->ep_out); 392 err_b_out: 393 usb_ep_disable(fu->ep_in); 394 err_b_in: 395 fu->flags = USBG_IS_BOT; 396 } 397 398 static int usbg_bot_setup(struct usb_function *f, 399 const struct usb_ctrlrequest *ctrl) 400 { 401 struct f_uas *fu = to_f_uas(f); 402 struct usb_composite_dev *cdev = f->config->cdev; 403 u16 w_value = le16_to_cpu(ctrl->wValue); 404 u16 w_length = le16_to_cpu(ctrl->wLength); 405 int luns; 406 u8 *ret_lun; 407 408 switch (ctrl->bRequest) { 409 case US_BULK_GET_MAX_LUN: 410 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 411 USB_RECIP_INTERFACE)) 412 return -ENOTSUPP; 413 414 if (w_length < 1) 415 return -EINVAL; 416 if (w_value != 0) 417 return -EINVAL; 418 luns = atomic_read(&fu->tpg->tpg_port_count); 419 if (!luns) { 420 pr_err("No LUNs configured?\n"); 421 return -EINVAL; 422 } 423 luns--; 424 if (luns > US_BULK_MAX_LUN_LIMIT) { 425 pr_info_once("Limiting the number of luns to 16\n"); 426 luns = US_BULK_MAX_LUN_LIMIT; 427 } 428 ret_lun = cdev->req->buf; 429 *ret_lun = luns; 430 cdev->req->length = 1; 431 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); 432 433 case US_BULK_RESET_REQUEST: 434 /* XXX maybe we should remove previous requests for IN + OUT */ 435 bot_enqueue_cmd_cbw(fu); 436 return 0; 437 } 438 return -ENOTSUPP; 439 } 440 441 /* Start uas.c code */ 442 443 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) 444 { 445 /* We have either all three allocated or none */ 446 if (!stream->req_in) 447 return; 448 449 usb_ep_free_request(fu->ep_in, stream->req_in); 450 usb_ep_free_request(fu->ep_out, stream->req_out); 451 usb_ep_free_request(fu->ep_status, stream->req_status); 452 453 stream->req_in = NULL; 454 stream->req_out = NULL; 455 stream->req_status = NULL; 456 } 457 458 static void uasp_free_cmdreq(struct f_uas *fu) 459 { 460 int i; 461 462 for (i = 0; i < USBG_NUM_CMDS; i++) { 463 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 464 kfree(fu->cmd[i].buf); 465 fu->cmd[i].req = NULL; 466 fu->cmd[i].buf = NULL; 467 } 468 } 469 470 static void uasp_cleanup_old_alt(struct f_uas *fu) 471 { 472 int i; 473 474 if (!(fu->flags & USBG_ENABLED)) 475 return; 476 477 usb_ep_disable(fu->ep_in); 478 usb_ep_disable(fu->ep_out); 479 usb_ep_disable(fu->ep_status); 480 usb_ep_disable(fu->ep_cmd); 481 482 for (i = 0; i < USBG_NUM_CMDS; i++) 483 uasp_cleanup_one_stream(fu, &fu->stream[i]); 484 uasp_free_cmdreq(fu); 485 } 486 487 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 488 489 static int uasp_prepare_r_request(struct usbg_cmd *cmd) 490 { 491 struct se_cmd *se_cmd = &cmd->se_cmd; 492 struct f_uas *fu = cmd->fu; 493 struct usb_gadget *gadget = fuas_to_gadget(fu); 494 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 495 496 if (!gadget->sg_supported) { 497 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 498 if (!cmd->data_buf) 499 return -ENOMEM; 500 501 sg_copy_to_buffer(se_cmd->t_data_sg, 502 se_cmd->t_data_nents, 503 cmd->data_buf, 504 se_cmd->data_length); 505 506 stream->req_in->buf = cmd->data_buf; 507 } else { 508 stream->req_in->buf = NULL; 509 stream->req_in->num_sgs = se_cmd->t_data_nents; 510 stream->req_in->sg = se_cmd->t_data_sg; 511 } 512 513 stream->req_in->is_last = 1; 514 stream->req_in->stream_id = cmd->tag; 515 stream->req_in->complete = uasp_status_data_cmpl; 516 stream->req_in->length = se_cmd->data_length; 517 stream->req_in->context = cmd; 518 519 cmd->state = UASP_SEND_STATUS; 520 return 0; 521 } 522 523 static void uasp_prepare_status(struct usbg_cmd *cmd) 524 { 525 struct se_cmd *se_cmd = &cmd->se_cmd; 526 struct sense_iu *iu = &cmd->sense_iu; 527 struct uas_stream *stream = &cmd->fu->stream[se_cmd->map_tag]; 528 529 cmd->state = UASP_QUEUE_COMMAND; 530 iu->iu_id = IU_ID_STATUS; 531 iu->tag = cpu_to_be16(cmd->tag); 532 533 /* 534 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 535 */ 536 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 537 iu->status = se_cmd->scsi_status; 538 stream->req_status->is_last = 1; 539 stream->req_status->stream_id = cmd->tag; 540 stream->req_status->context = cmd; 541 stream->req_status->length = se_cmd->scsi_sense_length + 16; 542 stream->req_status->buf = iu; 543 stream->req_status->complete = uasp_status_data_cmpl; 544 } 545 546 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 547 { 548 struct usbg_cmd *cmd = req->context; 549 struct f_uas *fu = cmd->fu; 550 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 551 int ret; 552 553 if (req->status < 0) 554 goto cleanup; 555 556 switch (cmd->state) { 557 case UASP_SEND_DATA: 558 ret = uasp_prepare_r_request(cmd); 559 if (ret) 560 goto cleanup; 561 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 562 if (ret) 563 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 564 break; 565 566 case UASP_RECEIVE_DATA: 567 ret = usbg_prepare_w_request(cmd, stream->req_out); 568 if (ret) 569 goto cleanup; 570 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 571 if (ret) 572 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 573 break; 574 575 case UASP_SEND_STATUS: 576 uasp_prepare_status(cmd); 577 ret = usb_ep_queue(fu->ep_status, stream->req_status, 578 GFP_ATOMIC); 579 if (ret) 580 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 581 break; 582 583 case UASP_QUEUE_COMMAND: 584 transport_generic_free_cmd(&cmd->se_cmd, 0); 585 usb_ep_queue(fu->ep_cmd, cmd->req, GFP_ATOMIC); 586 587 break; 588 589 default: 590 BUG(); 591 } 592 return; 593 594 cleanup: 595 transport_generic_free_cmd(&cmd->se_cmd, 0); 596 } 597 598 static int uasp_send_status_response(struct usbg_cmd *cmd) 599 { 600 struct f_uas *fu = cmd->fu; 601 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 602 struct sense_iu *iu = &cmd->sense_iu; 603 604 iu->tag = cpu_to_be16(cmd->tag); 605 stream->req_status->complete = uasp_status_data_cmpl; 606 stream->req_status->context = cmd; 607 cmd->fu = fu; 608 uasp_prepare_status(cmd); 609 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 610 } 611 612 static int uasp_send_read_response(struct usbg_cmd *cmd) 613 { 614 struct f_uas *fu = cmd->fu; 615 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 616 struct sense_iu *iu = &cmd->sense_iu; 617 int ret; 618 619 cmd->fu = fu; 620 621 iu->tag = cpu_to_be16(cmd->tag); 622 if (fu->flags & USBG_USE_STREAMS) { 623 624 ret = uasp_prepare_r_request(cmd); 625 if (ret) 626 goto out; 627 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 628 if (ret) { 629 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 630 kfree(cmd->data_buf); 631 cmd->data_buf = NULL; 632 } 633 634 } else { 635 636 iu->iu_id = IU_ID_READ_READY; 637 iu->tag = cpu_to_be16(cmd->tag); 638 639 stream->req_status->complete = uasp_status_data_cmpl; 640 stream->req_status->context = cmd; 641 642 cmd->state = UASP_SEND_DATA; 643 stream->req_status->buf = iu; 644 stream->req_status->length = sizeof(struct iu); 645 646 ret = usb_ep_queue(fu->ep_status, stream->req_status, 647 GFP_ATOMIC); 648 if (ret) 649 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 650 } 651 out: 652 return ret; 653 } 654 655 static int uasp_send_write_request(struct usbg_cmd *cmd) 656 { 657 struct f_uas *fu = cmd->fu; 658 struct se_cmd *se_cmd = &cmd->se_cmd; 659 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 660 struct sense_iu *iu = &cmd->sense_iu; 661 int ret; 662 663 cmd->fu = fu; 664 665 iu->tag = cpu_to_be16(cmd->tag); 666 667 if (fu->flags & USBG_USE_STREAMS) { 668 669 ret = usbg_prepare_w_request(cmd, stream->req_out); 670 if (ret) 671 goto cleanup; 672 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 673 if (ret) 674 pr_err("%s(%d)\n", __func__, __LINE__); 675 676 } else { 677 678 iu->iu_id = IU_ID_WRITE_READY; 679 iu->tag = cpu_to_be16(cmd->tag); 680 681 stream->req_status->complete = uasp_status_data_cmpl; 682 stream->req_status->context = cmd; 683 684 cmd->state = UASP_RECEIVE_DATA; 685 stream->req_status->buf = iu; 686 stream->req_status->length = sizeof(struct iu); 687 688 ret = usb_ep_queue(fu->ep_status, stream->req_status, 689 GFP_ATOMIC); 690 if (ret) 691 pr_err("%s(%d)\n", __func__, __LINE__); 692 } 693 694 cleanup: 695 return ret; 696 } 697 698 static int usbg_submit_command(struct f_uas *, struct usb_request *); 699 700 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 701 { 702 struct f_uas *fu = req->context; 703 704 if (req->status == -ESHUTDOWN) 705 return; 706 707 if (req->status < 0) { 708 usb_ep_queue(fu->ep_cmd, req, GFP_ATOMIC); 709 return; 710 } 711 712 usbg_submit_command(fu, req); 713 } 714 715 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 716 { 717 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 718 if (!stream->req_in) 719 goto out; 720 721 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 722 if (!stream->req_out) 723 goto err_out; 724 725 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 726 if (!stream->req_status) 727 goto err_sts; 728 729 return 0; 730 731 err_sts: 732 usb_ep_free_request(fu->ep_out, stream->req_out); 733 stream->req_out = NULL; 734 err_out: 735 usb_ep_free_request(fu->ep_in, stream->req_in); 736 stream->req_in = NULL; 737 out: 738 return -ENOMEM; 739 } 740 741 static int uasp_alloc_cmd(struct f_uas *fu, int i) 742 { 743 fu->cmd[i].req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 744 if (!fu->cmd[i].req) 745 goto err; 746 747 fu->cmd[i].buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 748 if (!fu->cmd[i].buf) 749 goto err_buf; 750 751 fu->cmd[i].req->complete = uasp_cmd_complete; 752 fu->cmd[i].req->buf = fu->cmd[i].buf; 753 fu->cmd[i].req->length = fu->ep_cmd->maxpacket; 754 fu->cmd[i].req->context = fu; 755 return 0; 756 757 err_buf: 758 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 759 err: 760 return -ENOMEM; 761 } 762 763 static int uasp_prepare_reqs(struct f_uas *fu) 764 { 765 int ret; 766 int i; 767 768 for (i = 0; i < USBG_NUM_CMDS; i++) { 769 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 770 if (ret) 771 goto err_cleanup; 772 } 773 774 for (i = 0; i < USBG_NUM_CMDS; i++) { 775 ret = uasp_alloc_cmd(fu, i); 776 if (ret) 777 goto err_free_stream; 778 779 ret = usb_ep_queue(fu->ep_cmd, fu->cmd[i].req, GFP_ATOMIC); 780 if (ret) 781 goto err_free_stream; 782 } 783 784 return 0; 785 786 err_free_stream: 787 uasp_free_cmdreq(fu); 788 789 err_cleanup: 790 if (i) { 791 do { 792 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 793 i--; 794 } while (i); 795 } 796 pr_err("UASP: endpoint setup failed\n"); 797 return ret; 798 } 799 800 static void uasp_set_alt(struct f_uas *fu) 801 { 802 struct usb_function *f = &fu->function; 803 struct usb_gadget *gadget = f->config->cdev->gadget; 804 int ret; 805 806 fu->flags = USBG_IS_UAS; 807 808 if (gadget->speed >= USB_SPEED_SUPER) 809 fu->flags |= USBG_USE_STREAMS; 810 811 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS); 812 ret = usb_ep_enable(fu->ep_in); 813 if (ret) 814 goto err_b_in; 815 816 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS); 817 ret = usb_ep_enable(fu->ep_out); 818 if (ret) 819 goto err_b_out; 820 821 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS); 822 ret = usb_ep_enable(fu->ep_cmd); 823 if (ret) 824 goto err_cmd; 825 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS); 826 ret = usb_ep_enable(fu->ep_status); 827 if (ret) 828 goto err_status; 829 830 ret = uasp_prepare_reqs(fu); 831 if (ret) 832 goto err_wq; 833 fu->flags |= USBG_ENABLED; 834 835 pr_info("Using the UAS protocol\n"); 836 return; 837 err_wq: 838 usb_ep_disable(fu->ep_status); 839 err_status: 840 usb_ep_disable(fu->ep_cmd); 841 err_cmd: 842 usb_ep_disable(fu->ep_out); 843 err_b_out: 844 usb_ep_disable(fu->ep_in); 845 err_b_in: 846 fu->flags = 0; 847 } 848 849 static int get_cmd_dir(const unsigned char *cdb) 850 { 851 int ret; 852 853 switch (cdb[0]) { 854 case READ_6: 855 case READ_10: 856 case READ_12: 857 case READ_16: 858 case INQUIRY: 859 case MODE_SENSE: 860 case MODE_SENSE_10: 861 case SERVICE_ACTION_IN_16: 862 case MAINTENANCE_IN: 863 case PERSISTENT_RESERVE_IN: 864 case SECURITY_PROTOCOL_IN: 865 case ACCESS_CONTROL_IN: 866 case REPORT_LUNS: 867 case READ_BLOCK_LIMITS: 868 case READ_POSITION: 869 case READ_CAPACITY: 870 case READ_TOC: 871 case READ_FORMAT_CAPACITIES: 872 case REQUEST_SENSE: 873 case ATA_12: 874 case ATA_16: 875 ret = DMA_FROM_DEVICE; 876 break; 877 878 case WRITE_6: 879 case WRITE_10: 880 case WRITE_12: 881 case WRITE_16: 882 case MODE_SELECT: 883 case MODE_SELECT_10: 884 case WRITE_VERIFY: 885 case WRITE_VERIFY_12: 886 case PERSISTENT_RESERVE_OUT: 887 case MAINTENANCE_OUT: 888 case SECURITY_PROTOCOL_OUT: 889 case ACCESS_CONTROL_OUT: 890 ret = DMA_TO_DEVICE; 891 break; 892 case ALLOW_MEDIUM_REMOVAL: 893 case TEST_UNIT_READY: 894 case SYNCHRONIZE_CACHE: 895 case START_STOP: 896 case ERASE: 897 case REZERO_UNIT: 898 case SEEK_10: 899 case SPACE: 900 case VERIFY: 901 case WRITE_FILEMARKS: 902 ret = DMA_NONE; 903 break; 904 default: 905 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 906 pr_warn(CMD_DIR_MSG, cdb[0]); 907 #undef CMD_DIR_MSG 908 ret = -EINVAL; 909 } 910 return ret; 911 } 912 913 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 914 { 915 struct usbg_cmd *cmd = req->context; 916 struct se_cmd *se_cmd = &cmd->se_cmd; 917 918 cmd->state = UASP_QUEUE_COMMAND; 919 920 if (req->status < 0) { 921 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 922 goto cleanup; 923 } 924 925 if (req->num_sgs == 0) { 926 sg_copy_from_buffer(se_cmd->t_data_sg, 927 se_cmd->t_data_nents, 928 cmd->data_buf, 929 se_cmd->data_length); 930 } 931 932 cmd->flags |= USBG_CMD_PENDING_DATA_WRITE; 933 queue_work(cmd->fu->tpg->workqueue, &cmd->work); 934 return; 935 936 cleanup: 937 target_put_sess_cmd(se_cmd); 938 transport_generic_free_cmd(&cmd->se_cmd, 0); 939 } 940 941 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 942 { 943 struct se_cmd *se_cmd = &cmd->se_cmd; 944 struct f_uas *fu = cmd->fu; 945 struct usb_gadget *gadget = fuas_to_gadget(fu); 946 947 if (!gadget->sg_supported) { 948 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 949 if (!cmd->data_buf) 950 return -ENOMEM; 951 952 req->buf = cmd->data_buf; 953 } else { 954 req->buf = NULL; 955 req->num_sgs = se_cmd->t_data_nents; 956 req->sg = se_cmd->t_data_sg; 957 } 958 959 req->is_last = 1; 960 req->stream_id = cmd->tag; 961 req->complete = usbg_data_write_cmpl; 962 req->length = se_cmd->data_length; 963 req->context = cmd; 964 965 cmd->state = UASP_SEND_STATUS; 966 return 0; 967 } 968 969 static int usbg_send_status_response(struct se_cmd *se_cmd) 970 { 971 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 972 se_cmd); 973 struct f_uas *fu = cmd->fu; 974 975 if (fu->flags & USBG_IS_BOT) 976 return bot_send_status_response(cmd); 977 else 978 return uasp_send_status_response(cmd); 979 } 980 981 static int usbg_send_write_request(struct se_cmd *se_cmd) 982 { 983 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 984 se_cmd); 985 struct f_uas *fu = cmd->fu; 986 987 if (fu->flags & USBG_IS_BOT) 988 return bot_send_write_request(cmd); 989 else 990 return uasp_send_write_request(cmd); 991 } 992 993 static int usbg_send_read_response(struct se_cmd *se_cmd) 994 { 995 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 996 se_cmd); 997 struct f_uas *fu = cmd->fu; 998 999 if (fu->flags & USBG_IS_BOT) 1000 return bot_send_read_response(cmd); 1001 else 1002 return uasp_send_read_response(cmd); 1003 } 1004 1005 static void usbg_cmd_work(struct work_struct *work) 1006 { 1007 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1008 struct se_cmd *se_cmd; 1009 struct tcm_usbg_nexus *tv_nexus; 1010 struct usbg_tpg *tpg; 1011 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1012 1013 /* 1014 * Note: each command will spawn its own process, and each stage of the 1015 * command is processed sequentially. Should this no longer be the case, 1016 * locking is needed. 1017 */ 1018 if (cmd->flags & USBG_CMD_PENDING_DATA_WRITE) { 1019 target_execute_cmd(&cmd->se_cmd); 1020 cmd->flags &= ~USBG_CMD_PENDING_DATA_WRITE; 1021 return; 1022 } 1023 1024 se_cmd = &cmd->se_cmd; 1025 tpg = cmd->fu->tpg; 1026 tv_nexus = tpg->tpg_nexus; 1027 dir = get_cmd_dir(cmd->cmd_buf); 1028 if (dir < 0) { 1029 __target_init_cmd(se_cmd, 1030 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1031 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1032 cmd->prio_attr, cmd->sense_iu.sense, 1033 cmd->unpacked_lun, NULL); 1034 goto out; 1035 } 1036 1037 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1038 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1039 cmd->prio_attr, dir, flags); 1040 1041 return; 1042 1043 out: 1044 transport_send_check_condition_and_sense(se_cmd, 1045 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1046 } 1047 1048 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1049 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1050 { 1051 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1052 struct usbg_cmd *cmd; 1053 int tag, cpu; 1054 1055 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1056 if (tag < 0) 1057 return ERR_PTR(-ENOMEM); 1058 1059 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1060 memset(cmd, 0, sizeof(*cmd)); 1061 cmd->se_cmd.map_tag = tag; 1062 cmd->se_cmd.map_cpu = cpu; 1063 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1064 cmd->fu = fu; 1065 1066 return cmd; 1067 } 1068 1069 static void usbg_release_cmd(struct se_cmd *); 1070 1071 static int usbg_submit_command(struct f_uas *fu, struct usb_request *req) 1072 { 1073 struct command_iu *cmd_iu = req->buf; 1074 struct usbg_cmd *cmd; 1075 struct usbg_tpg *tpg = fu->tpg; 1076 struct tcm_usbg_nexus *tv_nexus; 1077 u32 cmd_len; 1078 u16 scsi_tag; 1079 1080 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1081 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1082 return -EINVAL; 1083 } 1084 1085 tv_nexus = tpg->tpg_nexus; 1086 if (!tv_nexus) { 1087 pr_err("Missing nexus, ignoring command\n"); 1088 return -EINVAL; 1089 } 1090 1091 cmd_len = (cmd_iu->len & ~0x3) + 16; 1092 if (cmd_len > USBG_MAX_CMD) 1093 return -EINVAL; 1094 1095 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1096 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1097 if (IS_ERR(cmd)) { 1098 pr_err("usbg_get_cmd failed\n"); 1099 return -ENOMEM; 1100 } 1101 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1102 1103 switch (cmd_iu->prio_attr & 0x7) { 1104 case UAS_HEAD_TAG: 1105 cmd->prio_attr = TCM_HEAD_TAG; 1106 break; 1107 case UAS_ORDERED_TAG: 1108 cmd->prio_attr = TCM_ORDERED_TAG; 1109 break; 1110 case UAS_ACA: 1111 cmd->prio_attr = TCM_ACA_TAG; 1112 break; 1113 default: 1114 pr_debug_once("Unsupported prio_attr: %02x.\n", 1115 cmd_iu->prio_attr); 1116 fallthrough; 1117 case UAS_SIMPLE_TAG: 1118 cmd->prio_attr = TCM_SIMPLE_TAG; 1119 break; 1120 } 1121 1122 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1123 cmd->req = req; 1124 cmd->flags = 0; 1125 1126 INIT_WORK(&cmd->work, usbg_cmd_work); 1127 queue_work(tpg->workqueue, &cmd->work); 1128 1129 return 0; 1130 } 1131 1132 static void bot_cmd_work(struct work_struct *work) 1133 { 1134 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1135 struct se_cmd *se_cmd; 1136 struct tcm_usbg_nexus *tv_nexus; 1137 struct usbg_tpg *tpg; 1138 int dir; 1139 1140 /* 1141 * Note: each command will spawn its own process, and each stage of the 1142 * command is processed sequentially. Should this no longer be the case, 1143 * locking is needed. 1144 */ 1145 if (cmd->flags & USBG_CMD_PENDING_DATA_WRITE) { 1146 target_execute_cmd(&cmd->se_cmd); 1147 cmd->flags &= ~USBG_CMD_PENDING_DATA_WRITE; 1148 return; 1149 } 1150 1151 se_cmd = &cmd->se_cmd; 1152 tpg = cmd->fu->tpg; 1153 tv_nexus = tpg->tpg_nexus; 1154 dir = get_cmd_dir(cmd->cmd_buf); 1155 if (dir < 0) { 1156 __target_init_cmd(se_cmd, 1157 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1158 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1159 cmd->prio_attr, cmd->sense_iu.sense, 1160 cmd->unpacked_lun, NULL); 1161 goto out; 1162 } 1163 1164 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1165 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1166 cmd->data_len, cmd->prio_attr, dir, 0); 1167 return; 1168 1169 out: 1170 transport_send_check_condition_and_sense(se_cmd, 1171 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1172 } 1173 1174 static int bot_submit_command(struct f_uas *fu, 1175 void *cmdbuf, unsigned int len) 1176 { 1177 struct bulk_cb_wrap *cbw = cmdbuf; 1178 struct usbg_cmd *cmd; 1179 struct usbg_tpg *tpg = fu->tpg; 1180 struct tcm_usbg_nexus *tv_nexus; 1181 u32 cmd_len; 1182 1183 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1184 pr_err("Wrong signature on CBW\n"); 1185 return -EINVAL; 1186 } 1187 if (len != 31) { 1188 pr_err("Wrong length for CBW\n"); 1189 return -EINVAL; 1190 } 1191 1192 cmd_len = cbw->Length; 1193 if (cmd_len < 1 || cmd_len > 16) 1194 return -EINVAL; 1195 1196 tv_nexus = tpg->tpg_nexus; 1197 if (!tv_nexus) { 1198 pr_err("Missing nexus, ignoring command\n"); 1199 return -ENODEV; 1200 } 1201 1202 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1203 if (IS_ERR(cmd)) { 1204 pr_err("usbg_get_cmd failed\n"); 1205 return -ENOMEM; 1206 } 1207 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1208 1209 cmd->bot_tag = cbw->Tag; 1210 cmd->prio_attr = TCM_SIMPLE_TAG; 1211 cmd->unpacked_lun = cbw->Lun; 1212 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1213 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1214 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1215 cmd->flags = 0; 1216 1217 INIT_WORK(&cmd->work, bot_cmd_work); 1218 queue_work(tpg->workqueue, &cmd->work); 1219 1220 return 0; 1221 } 1222 1223 /* Start fabric.c code */ 1224 1225 static int usbg_check_true(struct se_portal_group *se_tpg) 1226 { 1227 return 1; 1228 } 1229 1230 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1231 { 1232 struct usbg_tpg *tpg = container_of(se_tpg, 1233 struct usbg_tpg, se_tpg); 1234 struct usbg_tport *tport = tpg->tport; 1235 1236 return &tport->tport_name[0]; 1237 } 1238 1239 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1240 { 1241 struct usbg_tpg *tpg = container_of(se_tpg, 1242 struct usbg_tpg, se_tpg); 1243 return tpg->tport_tpgt; 1244 } 1245 1246 static void usbg_release_cmd(struct se_cmd *se_cmd) 1247 { 1248 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1249 se_cmd); 1250 struct se_session *se_sess = se_cmd->se_sess; 1251 1252 kfree(cmd->data_buf); 1253 target_free_tag(se_sess, se_cmd); 1254 } 1255 1256 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1257 { 1258 } 1259 1260 static void usbg_aborted_task(struct se_cmd *se_cmd) 1261 { 1262 } 1263 1264 static const char *usbg_check_wwn(const char *name) 1265 { 1266 const char *n; 1267 unsigned int len; 1268 1269 n = strstr(name, "naa."); 1270 if (!n) 1271 return NULL; 1272 n += 4; 1273 len = strlen(n); 1274 if (len == 0 || len > USBG_NAMELEN - 1) 1275 return NULL; 1276 return n; 1277 } 1278 1279 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1280 { 1281 if (!usbg_check_wwn(name)) 1282 return -EINVAL; 1283 return 0; 1284 } 1285 1286 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1287 const char *name) 1288 { 1289 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1290 tport_wwn); 1291 struct usbg_tpg *tpg; 1292 unsigned long tpgt; 1293 int ret; 1294 struct f_tcm_opts *opts; 1295 unsigned i; 1296 1297 if (strstr(name, "tpgt_") != name) 1298 return ERR_PTR(-EINVAL); 1299 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1300 return ERR_PTR(-EINVAL); 1301 ret = -ENODEV; 1302 mutex_lock(&tpg_instances_lock); 1303 for (i = 0; i < TPG_INSTANCES; ++i) 1304 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1305 break; 1306 if (i == TPG_INSTANCES) 1307 goto unlock_inst; 1308 1309 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1310 func_inst); 1311 mutex_lock(&opts->dep_lock); 1312 if (!opts->ready) 1313 goto unlock_dep; 1314 1315 if (opts->has_dep) { 1316 if (!try_module_get(opts->dependent)) 1317 goto unlock_dep; 1318 } else { 1319 ret = configfs_depend_item_unlocked( 1320 wwn->wwn_group.cg_subsys, 1321 &opts->func_inst.group.cg_item); 1322 if (ret) 1323 goto unlock_dep; 1324 } 1325 1326 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1327 ret = -ENOMEM; 1328 if (!tpg) 1329 goto unref_dep; 1330 mutex_init(&tpg->tpg_mutex); 1331 atomic_set(&tpg->tpg_port_count, 0); 1332 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 1333 WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE); 1334 if (!tpg->workqueue) 1335 goto free_tpg; 1336 1337 tpg->tport = tport; 1338 tpg->tport_tpgt = tpgt; 1339 1340 /* 1341 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1342 * pretend to be SAS.. 1343 */ 1344 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1345 if (ret < 0) 1346 goto free_workqueue; 1347 1348 tpg_instances[i].tpg = tpg; 1349 tpg->fi = tpg_instances[i].func_inst; 1350 mutex_unlock(&opts->dep_lock); 1351 mutex_unlock(&tpg_instances_lock); 1352 return &tpg->se_tpg; 1353 1354 free_workqueue: 1355 destroy_workqueue(tpg->workqueue); 1356 free_tpg: 1357 kfree(tpg); 1358 unref_dep: 1359 if (opts->has_dep) 1360 module_put(opts->dependent); 1361 else 1362 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1363 unlock_dep: 1364 mutex_unlock(&opts->dep_lock); 1365 unlock_inst: 1366 mutex_unlock(&tpg_instances_lock); 1367 1368 return ERR_PTR(ret); 1369 } 1370 1371 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1372 1373 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1374 { 1375 struct usbg_tpg *tpg = container_of(se_tpg, 1376 struct usbg_tpg, se_tpg); 1377 unsigned i; 1378 struct f_tcm_opts *opts; 1379 1380 tcm_usbg_drop_nexus(tpg); 1381 core_tpg_deregister(se_tpg); 1382 destroy_workqueue(tpg->workqueue); 1383 1384 mutex_lock(&tpg_instances_lock); 1385 for (i = 0; i < TPG_INSTANCES; ++i) 1386 if (tpg_instances[i].tpg == tpg) 1387 break; 1388 if (i < TPG_INSTANCES) { 1389 tpg_instances[i].tpg = NULL; 1390 opts = container_of(tpg_instances[i].func_inst, 1391 struct f_tcm_opts, func_inst); 1392 mutex_lock(&opts->dep_lock); 1393 if (opts->has_dep) 1394 module_put(opts->dependent); 1395 else 1396 configfs_undepend_item_unlocked( 1397 &opts->func_inst.group.cg_item); 1398 mutex_unlock(&opts->dep_lock); 1399 } 1400 mutex_unlock(&tpg_instances_lock); 1401 1402 kfree(tpg); 1403 } 1404 1405 static struct se_wwn *usbg_make_tport( 1406 struct target_fabric_configfs *tf, 1407 struct config_group *group, 1408 const char *name) 1409 { 1410 struct usbg_tport *tport; 1411 const char *wnn_name; 1412 u64 wwpn = 0; 1413 1414 wnn_name = usbg_check_wwn(name); 1415 if (!wnn_name) 1416 return ERR_PTR(-EINVAL); 1417 1418 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1419 if (!(tport)) 1420 return ERR_PTR(-ENOMEM); 1421 1422 tport->tport_wwpn = wwpn; 1423 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1424 return &tport->tport_wwn; 1425 } 1426 1427 static void usbg_drop_tport(struct se_wwn *wwn) 1428 { 1429 struct usbg_tport *tport = container_of(wwn, 1430 struct usbg_tport, tport_wwn); 1431 kfree(tport); 1432 } 1433 1434 /* 1435 * If somebody feels like dropping the version property, go ahead. 1436 */ 1437 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1438 { 1439 return sprintf(page, "usb-gadget fabric module\n"); 1440 } 1441 1442 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1443 1444 static struct configfs_attribute *usbg_wwn_attrs[] = { 1445 &usbg_wwn_attr_version, 1446 NULL, 1447 }; 1448 1449 static int usbg_attach(struct usbg_tpg *); 1450 static void usbg_detach(struct usbg_tpg *); 1451 1452 static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable) 1453 { 1454 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1455 int ret = 0; 1456 1457 if (enable) 1458 ret = usbg_attach(tpg); 1459 else 1460 usbg_detach(tpg); 1461 if (ret) 1462 return ret; 1463 1464 tpg->gadget_connect = enable; 1465 1466 return 0; 1467 } 1468 1469 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1470 { 1471 struct se_portal_group *se_tpg = to_tpg(item); 1472 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1473 struct tcm_usbg_nexus *tv_nexus; 1474 ssize_t ret; 1475 1476 mutex_lock(&tpg->tpg_mutex); 1477 tv_nexus = tpg->tpg_nexus; 1478 if (!tv_nexus) { 1479 ret = -ENODEV; 1480 goto out; 1481 } 1482 ret = sysfs_emit(page, "%s\n", 1483 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1484 out: 1485 mutex_unlock(&tpg->tpg_mutex); 1486 return ret; 1487 } 1488 1489 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1490 struct se_session *se_sess, void *p) 1491 { 1492 struct usbg_tpg *tpg = container_of(se_tpg, 1493 struct usbg_tpg, se_tpg); 1494 1495 tpg->tpg_nexus = p; 1496 return 0; 1497 } 1498 1499 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1500 { 1501 struct tcm_usbg_nexus *tv_nexus; 1502 int ret = 0; 1503 1504 mutex_lock(&tpg->tpg_mutex); 1505 if (tpg->tpg_nexus) { 1506 ret = -EEXIST; 1507 pr_debug("tpg->tpg_nexus already exists\n"); 1508 goto out_unlock; 1509 } 1510 1511 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1512 if (!tv_nexus) { 1513 ret = -ENOMEM; 1514 goto out_unlock; 1515 } 1516 1517 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1518 USB_G_DEFAULT_SESSION_TAGS, 1519 sizeof(struct usbg_cmd), 1520 TARGET_PROT_NORMAL, name, 1521 tv_nexus, usbg_alloc_sess_cb); 1522 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1523 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1524 pr_debug(MAKE_NEXUS_MSG, name); 1525 #undef MAKE_NEXUS_MSG 1526 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1527 kfree(tv_nexus); 1528 } 1529 1530 out_unlock: 1531 mutex_unlock(&tpg->tpg_mutex); 1532 return ret; 1533 } 1534 1535 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1536 { 1537 struct se_session *se_sess; 1538 struct tcm_usbg_nexus *tv_nexus; 1539 int ret = -ENODEV; 1540 1541 mutex_lock(&tpg->tpg_mutex); 1542 tv_nexus = tpg->tpg_nexus; 1543 if (!tv_nexus) 1544 goto out; 1545 1546 se_sess = tv_nexus->tvn_se_sess; 1547 if (!se_sess) 1548 goto out; 1549 1550 if (atomic_read(&tpg->tpg_port_count)) { 1551 ret = -EPERM; 1552 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1553 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1554 #undef MSG 1555 goto out; 1556 } 1557 1558 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1559 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1560 /* 1561 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1562 */ 1563 target_remove_session(se_sess); 1564 tpg->tpg_nexus = NULL; 1565 1566 kfree(tv_nexus); 1567 ret = 0; 1568 out: 1569 mutex_unlock(&tpg->tpg_mutex); 1570 return ret; 1571 } 1572 1573 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1574 const char *page, size_t count) 1575 { 1576 struct se_portal_group *se_tpg = to_tpg(item); 1577 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1578 unsigned char i_port[USBG_NAMELEN], *ptr; 1579 int ret; 1580 1581 if (!strncmp(page, "NULL", 4)) { 1582 ret = tcm_usbg_drop_nexus(tpg); 1583 return (!ret) ? count : ret; 1584 } 1585 if (strlen(page) >= USBG_NAMELEN) { 1586 1587 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1588 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1589 #undef NEXUS_STORE_MSG 1590 return -EINVAL; 1591 } 1592 snprintf(i_port, USBG_NAMELEN, "%s", page); 1593 1594 ptr = strstr(i_port, "naa."); 1595 if (!ptr) { 1596 pr_err("Missing 'naa.' prefix\n"); 1597 return -EINVAL; 1598 } 1599 1600 if (i_port[strlen(i_port) - 1] == '\n') 1601 i_port[strlen(i_port) - 1] = '\0'; 1602 1603 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1604 if (ret < 0) 1605 return ret; 1606 return count; 1607 } 1608 1609 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1610 1611 static struct configfs_attribute *usbg_base_attrs[] = { 1612 &tcm_usbg_tpg_attr_nexus, 1613 NULL, 1614 }; 1615 1616 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1617 { 1618 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1619 1620 atomic_inc(&tpg->tpg_port_count); 1621 smp_mb__after_atomic(); 1622 return 0; 1623 } 1624 1625 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1626 struct se_lun *se_lun) 1627 { 1628 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1629 1630 atomic_dec(&tpg->tpg_port_count); 1631 smp_mb__after_atomic(); 1632 } 1633 1634 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1635 { 1636 return target_put_sess_cmd(se_cmd); 1637 } 1638 1639 static const struct target_core_fabric_ops usbg_ops = { 1640 .module = THIS_MODULE, 1641 .fabric_name = "usb_gadget", 1642 .tpg_get_wwn = usbg_get_fabric_wwn, 1643 .tpg_get_tag = usbg_get_tag, 1644 .tpg_check_demo_mode = usbg_check_true, 1645 .release_cmd = usbg_release_cmd, 1646 .sess_get_initiator_sid = NULL, 1647 .write_pending = usbg_send_write_request, 1648 .queue_data_in = usbg_send_read_response, 1649 .queue_status = usbg_send_status_response, 1650 .queue_tm_rsp = usbg_queue_tm_rsp, 1651 .aborted_task = usbg_aborted_task, 1652 .check_stop_free = usbg_check_stop_free, 1653 1654 .fabric_make_wwn = usbg_make_tport, 1655 .fabric_drop_wwn = usbg_drop_tport, 1656 .fabric_make_tpg = usbg_make_tpg, 1657 .fabric_enable_tpg = usbg_enable_tpg, 1658 .fabric_drop_tpg = usbg_drop_tpg, 1659 .fabric_post_link = usbg_port_link, 1660 .fabric_pre_unlink = usbg_port_unlink, 1661 .fabric_init_nodeacl = usbg_init_nodeacl, 1662 1663 .tfc_wwn_attrs = usbg_wwn_attrs, 1664 .tfc_tpg_base_attrs = usbg_base_attrs, 1665 1666 .default_submit_type = TARGET_DIRECT_SUBMIT, 1667 .direct_submit_supp = 1, 1668 }; 1669 1670 /* Start gadget.c code */ 1671 1672 static struct usb_interface_descriptor bot_intf_desc = { 1673 .bLength = sizeof(bot_intf_desc), 1674 .bDescriptorType = USB_DT_INTERFACE, 1675 .bNumEndpoints = 2, 1676 .bAlternateSetting = USB_G_ALT_INT_BBB, 1677 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1678 .bInterfaceSubClass = USB_SC_SCSI, 1679 .bInterfaceProtocol = USB_PR_BULK, 1680 }; 1681 1682 static struct usb_interface_descriptor uasp_intf_desc = { 1683 .bLength = sizeof(uasp_intf_desc), 1684 .bDescriptorType = USB_DT_INTERFACE, 1685 .bNumEndpoints = 4, 1686 .bAlternateSetting = USB_G_ALT_INT_UAS, 1687 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1688 .bInterfaceSubClass = USB_SC_SCSI, 1689 .bInterfaceProtocol = USB_PR_UAS, 1690 }; 1691 1692 static struct usb_endpoint_descriptor uasp_bi_desc = { 1693 .bLength = USB_DT_ENDPOINT_SIZE, 1694 .bDescriptorType = USB_DT_ENDPOINT, 1695 .bEndpointAddress = USB_DIR_IN, 1696 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1697 .wMaxPacketSize = cpu_to_le16(512), 1698 }; 1699 1700 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1701 .bLength = USB_DT_ENDPOINT_SIZE, 1702 .bDescriptorType = USB_DT_ENDPOINT, 1703 .bEndpointAddress = USB_DIR_IN, 1704 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1705 }; 1706 1707 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1708 .bLength = sizeof(uasp_bi_pipe_desc), 1709 .bDescriptorType = USB_DT_PIPE_USAGE, 1710 .bPipeID = DATA_IN_PIPE_ID, 1711 }; 1712 1713 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1714 .bLength = USB_DT_ENDPOINT_SIZE, 1715 .bDescriptorType = USB_DT_ENDPOINT, 1716 .bEndpointAddress = USB_DIR_IN, 1717 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1718 .wMaxPacketSize = cpu_to_le16(1024), 1719 }; 1720 1721 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1722 .bLength = sizeof(uasp_bi_ep_comp_desc), 1723 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1724 .bMaxBurst = 15, 1725 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1726 .wBytesPerInterval = 0, 1727 }; 1728 1729 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1730 .bLength = sizeof(bot_bi_ep_comp_desc), 1731 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1732 .bMaxBurst = 15, 1733 }; 1734 1735 static struct usb_endpoint_descriptor uasp_bo_desc = { 1736 .bLength = USB_DT_ENDPOINT_SIZE, 1737 .bDescriptorType = USB_DT_ENDPOINT, 1738 .bEndpointAddress = USB_DIR_OUT, 1739 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1740 .wMaxPacketSize = cpu_to_le16(512), 1741 }; 1742 1743 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1744 .bLength = USB_DT_ENDPOINT_SIZE, 1745 .bDescriptorType = USB_DT_ENDPOINT, 1746 .bEndpointAddress = USB_DIR_OUT, 1747 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1748 }; 1749 1750 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1751 .bLength = sizeof(uasp_bo_pipe_desc), 1752 .bDescriptorType = USB_DT_PIPE_USAGE, 1753 .bPipeID = DATA_OUT_PIPE_ID, 1754 }; 1755 1756 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1757 .bLength = USB_DT_ENDPOINT_SIZE, 1758 .bDescriptorType = USB_DT_ENDPOINT, 1759 .bEndpointAddress = USB_DIR_OUT, 1760 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1761 .wMaxPacketSize = cpu_to_le16(0x400), 1762 }; 1763 1764 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1765 .bLength = sizeof(uasp_bo_ep_comp_desc), 1766 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1767 .bMaxBurst = 15, 1768 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1769 }; 1770 1771 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1772 .bLength = sizeof(bot_bo_ep_comp_desc), 1773 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1774 .bMaxBurst = 15, 1775 }; 1776 1777 static struct usb_endpoint_descriptor uasp_status_desc = { 1778 .bLength = USB_DT_ENDPOINT_SIZE, 1779 .bDescriptorType = USB_DT_ENDPOINT, 1780 .bEndpointAddress = USB_DIR_IN, 1781 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1782 .wMaxPacketSize = cpu_to_le16(512), 1783 }; 1784 1785 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1786 .bLength = USB_DT_ENDPOINT_SIZE, 1787 .bDescriptorType = USB_DT_ENDPOINT, 1788 .bEndpointAddress = USB_DIR_IN, 1789 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1790 }; 1791 1792 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1793 .bLength = sizeof(uasp_status_pipe_desc), 1794 .bDescriptorType = USB_DT_PIPE_USAGE, 1795 .bPipeID = STATUS_PIPE_ID, 1796 }; 1797 1798 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1799 .bLength = USB_DT_ENDPOINT_SIZE, 1800 .bDescriptorType = USB_DT_ENDPOINT, 1801 .bEndpointAddress = USB_DIR_IN, 1802 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1803 .wMaxPacketSize = cpu_to_le16(1024), 1804 }; 1805 1806 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1807 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1808 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1809 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1810 }; 1811 1812 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1813 .bLength = USB_DT_ENDPOINT_SIZE, 1814 .bDescriptorType = USB_DT_ENDPOINT, 1815 .bEndpointAddress = USB_DIR_OUT, 1816 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1817 .wMaxPacketSize = cpu_to_le16(512), 1818 }; 1819 1820 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1821 .bLength = USB_DT_ENDPOINT_SIZE, 1822 .bDescriptorType = USB_DT_ENDPOINT, 1823 .bEndpointAddress = USB_DIR_OUT, 1824 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1825 }; 1826 1827 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1828 .bLength = sizeof(uasp_cmd_pipe_desc), 1829 .bDescriptorType = USB_DT_PIPE_USAGE, 1830 .bPipeID = CMD_PIPE_ID, 1831 }; 1832 1833 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1834 .bLength = USB_DT_ENDPOINT_SIZE, 1835 .bDescriptorType = USB_DT_ENDPOINT, 1836 .bEndpointAddress = USB_DIR_OUT, 1837 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1838 .wMaxPacketSize = cpu_to_le16(1024), 1839 }; 1840 1841 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1842 .bLength = sizeof(uasp_cmd_comp_desc), 1843 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1844 }; 1845 1846 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1847 (struct usb_descriptor_header *) &bot_intf_desc, 1848 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1849 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1850 1851 (struct usb_descriptor_header *) &uasp_intf_desc, 1852 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1853 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1854 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1855 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1856 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1857 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1858 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1859 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1860 NULL, 1861 }; 1862 1863 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1864 (struct usb_descriptor_header *) &bot_intf_desc, 1865 (struct usb_descriptor_header *) &uasp_bi_desc, 1866 (struct usb_descriptor_header *) &uasp_bo_desc, 1867 1868 (struct usb_descriptor_header *) &uasp_intf_desc, 1869 (struct usb_descriptor_header *) &uasp_bi_desc, 1870 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1871 (struct usb_descriptor_header *) &uasp_bo_desc, 1872 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1873 (struct usb_descriptor_header *) &uasp_status_desc, 1874 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1875 (struct usb_descriptor_header *) &uasp_cmd_desc, 1876 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1877 NULL, 1878 }; 1879 1880 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1881 (struct usb_descriptor_header *) &bot_intf_desc, 1882 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1883 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1884 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1885 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1886 1887 (struct usb_descriptor_header *) &uasp_intf_desc, 1888 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1889 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1890 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1891 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1892 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1893 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1894 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1895 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1896 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1897 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1898 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1899 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1900 NULL, 1901 }; 1902 1903 static struct usb_string tcm_us_strings[] = { 1904 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1905 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1906 { }, 1907 }; 1908 1909 static struct usb_gadget_strings tcm_stringtab = { 1910 .language = 0x0409, 1911 .strings = tcm_us_strings, 1912 }; 1913 1914 static struct usb_gadget_strings *tcm_strings[] = { 1915 &tcm_stringtab, 1916 NULL, 1917 }; 1918 1919 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1920 { 1921 struct f_uas *fu = to_f_uas(f); 1922 struct usb_string *us; 1923 struct usb_gadget *gadget = c->cdev->gadget; 1924 struct usb_ep *ep; 1925 struct f_tcm_opts *opts; 1926 int iface; 1927 int ret; 1928 1929 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1930 1931 mutex_lock(&opts->dep_lock); 1932 if (!opts->can_attach) { 1933 mutex_unlock(&opts->dep_lock); 1934 return -ENODEV; 1935 } 1936 mutex_unlock(&opts->dep_lock); 1937 us = usb_gstrings_attach(c->cdev, tcm_strings, 1938 ARRAY_SIZE(tcm_us_strings)); 1939 if (IS_ERR(us)) 1940 return PTR_ERR(us); 1941 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 1942 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 1943 1944 iface = usb_interface_id(c, f); 1945 if (iface < 0) 1946 return iface; 1947 1948 bot_intf_desc.bInterfaceNumber = iface; 1949 uasp_intf_desc.bInterfaceNumber = iface; 1950 fu->iface = iface; 1951 ep = usb_ep_autoconfig(gadget, &uasp_fs_bi_desc); 1952 if (!ep) 1953 goto ep_fail; 1954 1955 fu->ep_in = ep; 1956 1957 ep = usb_ep_autoconfig(gadget, &uasp_fs_bo_desc); 1958 if (!ep) 1959 goto ep_fail; 1960 fu->ep_out = ep; 1961 1962 ep = usb_ep_autoconfig(gadget, &uasp_fs_status_desc); 1963 if (!ep) 1964 goto ep_fail; 1965 fu->ep_status = ep; 1966 1967 ep = usb_ep_autoconfig(gadget, &uasp_fs_cmd_desc); 1968 if (!ep) 1969 goto ep_fail; 1970 fu->ep_cmd = ep; 1971 1972 /* Assume endpoint addresses are the same for both speeds */ 1973 uasp_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 1974 uasp_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 1975 uasp_status_desc.bEndpointAddress = 1976 uasp_fs_status_desc.bEndpointAddress; 1977 uasp_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 1978 1979 uasp_ss_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 1980 uasp_ss_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 1981 uasp_ss_status_desc.bEndpointAddress = 1982 uasp_fs_status_desc.bEndpointAddress; 1983 uasp_ss_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 1984 1985 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 1986 uasp_hs_function_desc, uasp_ss_function_desc, 1987 uasp_ss_function_desc); 1988 if (ret) 1989 goto ep_fail; 1990 1991 return 0; 1992 ep_fail: 1993 pr_err("Can't claim all required eps\n"); 1994 1995 return -ENOTSUPP; 1996 } 1997 1998 struct guas_setup_wq { 1999 struct work_struct work; 2000 struct f_uas *fu; 2001 unsigned int alt; 2002 }; 2003 2004 static void tcm_delayed_set_alt(struct work_struct *wq) 2005 { 2006 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2007 work); 2008 struct f_uas *fu = work->fu; 2009 int alt = work->alt; 2010 2011 kfree(work); 2012 2013 if (fu->flags & USBG_IS_BOT) 2014 bot_cleanup_old_alt(fu); 2015 if (fu->flags & USBG_IS_UAS) 2016 uasp_cleanup_old_alt(fu); 2017 2018 if (alt == USB_G_ALT_INT_BBB) 2019 bot_set_alt(fu); 2020 else if (alt == USB_G_ALT_INT_UAS) 2021 uasp_set_alt(fu); 2022 usb_composite_setup_continue(fu->function.config->cdev); 2023 } 2024 2025 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2026 { 2027 struct f_uas *fu = to_f_uas(f); 2028 2029 if (fu->iface != intf) 2030 return -EOPNOTSUPP; 2031 2032 if (fu->flags & USBG_IS_BOT) 2033 return USB_G_ALT_INT_BBB; 2034 else if (fu->flags & USBG_IS_UAS) 2035 return USB_G_ALT_INT_UAS; 2036 2037 return -EOPNOTSUPP; 2038 } 2039 2040 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2041 { 2042 struct f_uas *fu = to_f_uas(f); 2043 2044 if (fu->iface != intf) 2045 return -EOPNOTSUPP; 2046 2047 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2048 struct guas_setup_wq *work; 2049 2050 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2051 if (!work) 2052 return -ENOMEM; 2053 INIT_WORK(&work->work, tcm_delayed_set_alt); 2054 work->fu = fu; 2055 work->alt = alt; 2056 schedule_work(&work->work); 2057 return USB_GADGET_DELAYED_STATUS; 2058 } 2059 return -EOPNOTSUPP; 2060 } 2061 2062 static void tcm_disable(struct usb_function *f) 2063 { 2064 struct f_uas *fu = to_f_uas(f); 2065 2066 if (fu->flags & USBG_IS_UAS) 2067 uasp_cleanup_old_alt(fu); 2068 else if (fu->flags & USBG_IS_BOT) 2069 bot_cleanup_old_alt(fu); 2070 fu->flags = 0; 2071 } 2072 2073 static int tcm_setup(struct usb_function *f, 2074 const struct usb_ctrlrequest *ctrl) 2075 { 2076 struct f_uas *fu = to_f_uas(f); 2077 2078 if (!(fu->flags & USBG_IS_BOT)) 2079 return -EOPNOTSUPP; 2080 2081 return usbg_bot_setup(f, ctrl); 2082 } 2083 2084 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2085 { 2086 return container_of(to_config_group(item), struct f_tcm_opts, 2087 func_inst.group); 2088 } 2089 2090 static void tcm_attr_release(struct config_item *item) 2091 { 2092 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2093 2094 usb_put_function_instance(&opts->func_inst); 2095 } 2096 2097 static struct configfs_item_operations tcm_item_ops = { 2098 .release = tcm_attr_release, 2099 }; 2100 2101 static const struct config_item_type tcm_func_type = { 2102 .ct_item_ops = &tcm_item_ops, 2103 .ct_owner = THIS_MODULE, 2104 }; 2105 2106 static void tcm_free_inst(struct usb_function_instance *f) 2107 { 2108 struct f_tcm_opts *opts; 2109 unsigned i; 2110 2111 opts = container_of(f, struct f_tcm_opts, func_inst); 2112 2113 mutex_lock(&tpg_instances_lock); 2114 for (i = 0; i < TPG_INSTANCES; ++i) 2115 if (tpg_instances[i].func_inst == f) 2116 break; 2117 if (i < TPG_INSTANCES) 2118 tpg_instances[i].func_inst = NULL; 2119 mutex_unlock(&tpg_instances_lock); 2120 2121 kfree(opts); 2122 } 2123 2124 static int tcm_register_callback(struct usb_function_instance *f) 2125 { 2126 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2127 2128 mutex_lock(&opts->dep_lock); 2129 opts->can_attach = true; 2130 mutex_unlock(&opts->dep_lock); 2131 2132 return 0; 2133 } 2134 2135 static void tcm_unregister_callback(struct usb_function_instance *f) 2136 { 2137 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2138 2139 mutex_lock(&opts->dep_lock); 2140 unregister_gadget_item(opts-> 2141 func_inst.group.cg_item.ci_parent->ci_parent); 2142 opts->can_attach = false; 2143 mutex_unlock(&opts->dep_lock); 2144 } 2145 2146 static int usbg_attach(struct usbg_tpg *tpg) 2147 { 2148 struct usb_function_instance *f = tpg->fi; 2149 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2150 2151 if (opts->tcm_register_callback) 2152 return opts->tcm_register_callback(f); 2153 2154 return 0; 2155 } 2156 2157 static void usbg_detach(struct usbg_tpg *tpg) 2158 { 2159 struct usb_function_instance *f = tpg->fi; 2160 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2161 2162 if (opts->tcm_unregister_callback) 2163 opts->tcm_unregister_callback(f); 2164 } 2165 2166 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2167 { 2168 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2169 2170 pr_debug("tcm: Activating %s\n", name); 2171 2172 mutex_lock(&opts->dep_lock); 2173 opts->ready = true; 2174 mutex_unlock(&opts->dep_lock); 2175 2176 return 0; 2177 } 2178 2179 static struct usb_function_instance *tcm_alloc_inst(void) 2180 { 2181 struct f_tcm_opts *opts; 2182 int i; 2183 2184 2185 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2186 if (!opts) 2187 return ERR_PTR(-ENOMEM); 2188 2189 mutex_lock(&tpg_instances_lock); 2190 for (i = 0; i < TPG_INSTANCES; ++i) 2191 if (!tpg_instances[i].func_inst) 2192 break; 2193 2194 if (i == TPG_INSTANCES) { 2195 mutex_unlock(&tpg_instances_lock); 2196 kfree(opts); 2197 return ERR_PTR(-EBUSY); 2198 } 2199 tpg_instances[i].func_inst = &opts->func_inst; 2200 mutex_unlock(&tpg_instances_lock); 2201 2202 mutex_init(&opts->dep_lock); 2203 opts->func_inst.set_inst_name = tcm_set_name; 2204 opts->func_inst.free_func_inst = tcm_free_inst; 2205 opts->tcm_register_callback = tcm_register_callback; 2206 opts->tcm_unregister_callback = tcm_unregister_callback; 2207 2208 config_group_init_type_name(&opts->func_inst.group, "", 2209 &tcm_func_type); 2210 2211 return &opts->func_inst; 2212 } 2213 2214 static void tcm_free(struct usb_function *f) 2215 { 2216 struct f_uas *tcm = to_f_uas(f); 2217 2218 kfree(tcm); 2219 } 2220 2221 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2222 { 2223 usb_free_all_descriptors(f); 2224 } 2225 2226 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2227 { 2228 struct f_uas *fu; 2229 unsigned i; 2230 2231 mutex_lock(&tpg_instances_lock); 2232 for (i = 0; i < TPG_INSTANCES; ++i) 2233 if (tpg_instances[i].func_inst == fi) 2234 break; 2235 if (i == TPG_INSTANCES) { 2236 mutex_unlock(&tpg_instances_lock); 2237 return ERR_PTR(-ENODEV); 2238 } 2239 2240 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2241 if (!fu) { 2242 mutex_unlock(&tpg_instances_lock); 2243 return ERR_PTR(-ENOMEM); 2244 } 2245 2246 fu->function.name = "Target Function"; 2247 fu->function.bind = tcm_bind; 2248 fu->function.unbind = tcm_unbind; 2249 fu->function.set_alt = tcm_set_alt; 2250 fu->function.get_alt = tcm_get_alt; 2251 fu->function.setup = tcm_setup; 2252 fu->function.disable = tcm_disable; 2253 fu->function.free_func = tcm_free; 2254 fu->tpg = tpg_instances[i].tpg; 2255 mutex_unlock(&tpg_instances_lock); 2256 2257 return &fu->function; 2258 } 2259 2260 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2261 2262 static int __init tcm_init(void) 2263 { 2264 int ret; 2265 2266 ret = usb_function_register(&tcmusb_func); 2267 if (ret) 2268 return ret; 2269 2270 ret = target_register_template(&usbg_ops); 2271 if (ret) 2272 usb_function_unregister(&tcmusb_func); 2273 2274 return ret; 2275 } 2276 module_init(tcm_init); 2277 2278 static void __exit tcm_exit(void) 2279 { 2280 target_unregister_template(&usbg_ops); 2281 usb_function_unregister(&tcmusb_func); 2282 } 2283 module_exit(tcm_exit); 2284 2285 MODULE_DESCRIPTION("Target based USB-Gadget"); 2286 MODULE_LICENSE("GPL"); 2287 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2288