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 == -ESHUTDOWN) 66 return; 67 68 if (req->status < 0) 69 pr_err("ERR %s(%d)\n", __func__, __LINE__); 70 71 /* CSW completed, wait for next CBW */ 72 bot_enqueue_cmd_cbw(fu); 73 } 74 75 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd) 76 { 77 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 78 int ret; 79 unsigned int csw_stat; 80 81 csw_stat = cmd->csw_code; 82 csw->Tag = cmd->bot_tag; 83 csw->Status = csw_stat; 84 fu->bot_status.req->context = cmd; 85 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC); 86 if (ret) 87 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 88 } 89 90 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req) 91 { 92 struct usbg_cmd *cmd = req->context; 93 struct f_uas *fu = cmd->fu; 94 95 if (req->status < 0) 96 pr_err("ERR %s(%d)\n", __func__, __LINE__); 97 98 if (cmd->data_len) { 99 if (cmd->data_len > ep->maxpacket) { 100 req->length = ep->maxpacket; 101 cmd->data_len -= ep->maxpacket; 102 } else { 103 req->length = cmd->data_len; 104 cmd->data_len = 0; 105 } 106 107 usb_ep_queue(ep, req, GFP_ATOMIC); 108 return; 109 } 110 bot_enqueue_sense_code(fu, cmd); 111 } 112 113 static void bot_send_bad_status(struct usbg_cmd *cmd) 114 { 115 struct f_uas *fu = cmd->fu; 116 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 117 struct usb_request *req; 118 struct usb_ep *ep; 119 120 csw->Residue = cpu_to_le32(cmd->data_len); 121 122 if (cmd->data_len) { 123 if (cmd->is_read) { 124 ep = fu->ep_in; 125 req = fu->bot_req_in; 126 } else { 127 ep = fu->ep_out; 128 req = fu->bot_req_out; 129 } 130 131 if (cmd->data_len > fu->ep_in->maxpacket) { 132 req->length = ep->maxpacket; 133 cmd->data_len -= ep->maxpacket; 134 } else { 135 req->length = cmd->data_len; 136 cmd->data_len = 0; 137 } 138 req->complete = bot_err_compl; 139 req->context = cmd; 140 req->buf = fu->cmd[0].buf; 141 usb_ep_queue(ep, req, GFP_KERNEL); 142 } else { 143 bot_enqueue_sense_code(fu, cmd); 144 } 145 } 146 147 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data) 148 { 149 struct f_uas *fu = cmd->fu; 150 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 151 int ret; 152 153 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) { 154 if (!moved_data && cmd->data_len) { 155 /* 156 * the host wants to move data, we don't. Fill / empty 157 * the pipe and then send the csw with reside set. 158 */ 159 cmd->csw_code = US_BULK_STAT_OK; 160 bot_send_bad_status(cmd); 161 return 0; 162 } 163 164 csw->Tag = cmd->bot_tag; 165 csw->Residue = cpu_to_le32(0); 166 csw->Status = US_BULK_STAT_OK; 167 fu->bot_status.req->context = cmd; 168 169 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL); 170 if (ret) 171 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 172 } else { 173 cmd->csw_code = US_BULK_STAT_FAIL; 174 bot_send_bad_status(cmd); 175 } 176 return 0; 177 } 178 179 /* 180 * Called after command (no data transfer) or after the write (to device) 181 * operation is completed 182 */ 183 static int bot_send_status_response(struct usbg_cmd *cmd) 184 { 185 bool moved_data = false; 186 187 if (!cmd->is_read) 188 moved_data = true; 189 return bot_send_status(cmd, moved_data); 190 } 191 192 /* Read request completed, now we have to send the CSW */ 193 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req) 194 { 195 struct usbg_cmd *cmd = req->context; 196 197 if (req->status < 0) 198 pr_err("ERR %s(%d)\n", __func__, __LINE__); 199 200 if (req->status == -ESHUTDOWN) { 201 transport_generic_free_cmd(&cmd->se_cmd, 0); 202 return; 203 } 204 205 bot_send_status(cmd, true); 206 } 207 208 static int bot_send_read_response(struct usbg_cmd *cmd) 209 { 210 struct f_uas *fu = cmd->fu; 211 struct se_cmd *se_cmd = &cmd->se_cmd; 212 struct usb_gadget *gadget = fuas_to_gadget(fu); 213 int ret; 214 215 if (!cmd->data_len) { 216 cmd->csw_code = US_BULK_STAT_PHASE; 217 bot_send_bad_status(cmd); 218 return 0; 219 } 220 221 if (!gadget->sg_supported) { 222 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 223 if (!cmd->data_buf) 224 return -ENOMEM; 225 226 sg_copy_to_buffer(se_cmd->t_data_sg, 227 se_cmd->t_data_nents, 228 cmd->data_buf, 229 se_cmd->data_length); 230 231 fu->bot_req_in->buf = cmd->data_buf; 232 } else { 233 fu->bot_req_in->buf = NULL; 234 fu->bot_req_in->num_sgs = se_cmd->t_data_nents; 235 fu->bot_req_in->sg = se_cmd->t_data_sg; 236 } 237 238 fu->bot_req_in->complete = bot_read_compl; 239 fu->bot_req_in->length = se_cmd->data_length; 240 fu->bot_req_in->context = cmd; 241 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC); 242 if (ret) 243 pr_err("%s(%d)\n", __func__, __LINE__); 244 return 0; 245 } 246 247 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); 248 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); 249 250 static int bot_send_write_request(struct usbg_cmd *cmd) 251 { 252 struct f_uas *fu = cmd->fu; 253 int ret; 254 255 cmd->fu = fu; 256 257 if (!cmd->data_len) { 258 cmd->csw_code = US_BULK_STAT_PHASE; 259 return -EINVAL; 260 } 261 262 ret = usbg_prepare_w_request(cmd, fu->bot_req_out); 263 if (ret) 264 goto cleanup; 265 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); 266 if (ret) 267 pr_err("%s(%d)\n", __func__, __LINE__); 268 269 cleanup: 270 return ret; 271 } 272 273 static int bot_submit_command(struct f_uas *, void *, unsigned int); 274 275 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) 276 { 277 struct f_uas *fu = req->context; 278 int ret; 279 280 if (req->status == -ESHUTDOWN) 281 return; 282 283 fu->flags &= ~USBG_BOT_CMD_PEND; 284 285 if (req->status < 0) 286 return; 287 288 ret = bot_submit_command(fu, req->buf, req->actual); 289 if (ret) 290 pr_err("%s(%d): %d\n", __func__, __LINE__, ret); 291 } 292 293 static int bot_prepare_reqs(struct f_uas *fu) 294 { 295 int ret; 296 297 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 298 if (!fu->bot_req_in) 299 goto err; 300 301 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 302 if (!fu->bot_req_out) 303 goto err_out; 304 305 fu->cmd[0].req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 306 if (!fu->cmd[0].req) 307 goto err_cmd; 308 309 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 310 if (!fu->bot_status.req) 311 goto err_sts; 312 313 fu->bot_status.req->buf = &fu->bot_status.csw; 314 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; 315 fu->bot_status.req->complete = bot_status_complete; 316 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); 317 318 fu->cmd[0].buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); 319 if (!fu->cmd[0].buf) 320 goto err_buf; 321 322 fu->cmd[0].req->complete = bot_cmd_complete; 323 fu->cmd[0].req->buf = fu->cmd[0].buf; 324 fu->cmd[0].req->length = fu->ep_out->maxpacket; 325 fu->cmd[0].req->context = fu; 326 327 ret = bot_enqueue_cmd_cbw(fu); 328 if (ret) 329 goto err_queue; 330 return 0; 331 err_queue: 332 kfree(fu->cmd[0].buf); 333 fu->cmd[0].buf = NULL; 334 err_buf: 335 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 336 err_sts: 337 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 338 fu->cmd[0].req = NULL; 339 err_cmd: 340 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 341 fu->bot_req_out = NULL; 342 err_out: 343 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 344 fu->bot_req_in = NULL; 345 err: 346 pr_err("BOT: endpoint setup failed\n"); 347 return -ENOMEM; 348 } 349 350 static void bot_cleanup_old_alt(struct f_uas *fu) 351 { 352 if (!(fu->flags & USBG_ENABLED)) 353 return; 354 355 usb_ep_disable(fu->ep_in); 356 usb_ep_disable(fu->ep_out); 357 358 if (!fu->bot_req_in) 359 return; 360 361 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 362 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 363 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 364 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 365 366 kfree(fu->cmd[0].buf); 367 368 fu->bot_req_in = NULL; 369 fu->bot_req_out = NULL; 370 fu->cmd[0].req = NULL; 371 fu->bot_status.req = NULL; 372 fu->cmd[0].buf = NULL; 373 } 374 375 static void bot_set_alt(struct f_uas *fu) 376 { 377 struct usb_function *f = &fu->function; 378 struct usb_gadget *gadget = f->config->cdev->gadget; 379 int ret; 380 381 fu->flags = USBG_IS_BOT; 382 383 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB); 384 ret = usb_ep_enable(fu->ep_in); 385 if (ret) 386 goto err_b_in; 387 388 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB); 389 ret = usb_ep_enable(fu->ep_out); 390 if (ret) 391 goto err_b_out; 392 393 ret = bot_prepare_reqs(fu); 394 if (ret) 395 goto err_wq; 396 fu->flags |= USBG_ENABLED; 397 pr_info("Using the BOT protocol\n"); 398 return; 399 err_wq: 400 usb_ep_disable(fu->ep_out); 401 err_b_out: 402 usb_ep_disable(fu->ep_in); 403 err_b_in: 404 fu->flags = USBG_IS_BOT; 405 } 406 407 static int usbg_bot_setup(struct usb_function *f, 408 const struct usb_ctrlrequest *ctrl) 409 { 410 struct f_uas *fu = to_f_uas(f); 411 struct usb_composite_dev *cdev = f->config->cdev; 412 u16 w_value = le16_to_cpu(ctrl->wValue); 413 u16 w_length = le16_to_cpu(ctrl->wLength); 414 int luns; 415 u8 *ret_lun; 416 417 switch (ctrl->bRequest) { 418 case US_BULK_GET_MAX_LUN: 419 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 420 USB_RECIP_INTERFACE)) 421 return -ENOTSUPP; 422 423 if (w_length < 1) 424 return -EINVAL; 425 if (w_value != 0) 426 return -EINVAL; 427 luns = atomic_read(&fu->tpg->tpg_port_count); 428 if (!luns) { 429 pr_err("No LUNs configured?\n"); 430 return -EINVAL; 431 } 432 luns--; 433 if (luns > US_BULK_MAX_LUN_LIMIT) { 434 pr_info_once("Limiting the number of luns to 16\n"); 435 luns = US_BULK_MAX_LUN_LIMIT; 436 } 437 ret_lun = cdev->req->buf; 438 *ret_lun = luns; 439 cdev->req->length = 1; 440 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); 441 442 case US_BULK_RESET_REQUEST: 443 /* XXX maybe we should remove previous requests for IN + OUT */ 444 bot_enqueue_cmd_cbw(fu); 445 return 0; 446 } 447 return -ENOTSUPP; 448 } 449 450 /* Start uas.c code */ 451 452 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) 453 { 454 /* We have either all three allocated or none */ 455 if (!stream->req_in) 456 return; 457 458 usb_ep_free_request(fu->ep_in, stream->req_in); 459 usb_ep_free_request(fu->ep_out, stream->req_out); 460 usb_ep_free_request(fu->ep_status, stream->req_status); 461 462 stream->req_in = NULL; 463 stream->req_out = NULL; 464 stream->req_status = NULL; 465 } 466 467 static void uasp_free_cmdreq(struct f_uas *fu) 468 { 469 int i; 470 471 for (i = 0; i < USBG_NUM_CMDS; i++) { 472 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 473 kfree(fu->cmd[i].buf); 474 fu->cmd[i].req = NULL; 475 fu->cmd[i].buf = NULL; 476 } 477 } 478 479 static void uasp_cleanup_old_alt(struct f_uas *fu) 480 { 481 int i; 482 483 if (!(fu->flags & USBG_ENABLED)) 484 return; 485 486 usb_ep_disable(fu->ep_in); 487 usb_ep_disable(fu->ep_out); 488 usb_ep_disable(fu->ep_status); 489 usb_ep_disable(fu->ep_cmd); 490 491 for (i = 0; i < USBG_NUM_CMDS; i++) 492 uasp_cleanup_one_stream(fu, &fu->stream[i]); 493 uasp_free_cmdreq(fu); 494 } 495 496 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 497 498 static int uasp_prepare_r_request(struct usbg_cmd *cmd) 499 { 500 struct se_cmd *se_cmd = &cmd->se_cmd; 501 struct f_uas *fu = cmd->fu; 502 struct usb_gadget *gadget = fuas_to_gadget(fu); 503 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 504 505 if (!gadget->sg_supported) { 506 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 507 if (!cmd->data_buf) 508 return -ENOMEM; 509 510 sg_copy_to_buffer(se_cmd->t_data_sg, 511 se_cmd->t_data_nents, 512 cmd->data_buf, 513 se_cmd->data_length); 514 515 stream->req_in->buf = cmd->data_buf; 516 } else { 517 stream->req_in->buf = NULL; 518 stream->req_in->num_sgs = se_cmd->t_data_nents; 519 stream->req_in->sg = se_cmd->t_data_sg; 520 } 521 522 stream->req_in->is_last = 1; 523 stream->req_in->stream_id = cmd->tag; 524 stream->req_in->complete = uasp_status_data_cmpl; 525 stream->req_in->length = se_cmd->data_length; 526 stream->req_in->context = cmd; 527 528 cmd->state = UASP_SEND_STATUS; 529 return 0; 530 } 531 532 static void uasp_prepare_status(struct usbg_cmd *cmd) 533 { 534 struct se_cmd *se_cmd = &cmd->se_cmd; 535 struct sense_iu *iu = &cmd->sense_iu; 536 struct uas_stream *stream = &cmd->fu->stream[se_cmd->map_tag]; 537 538 cmd->state = UASP_QUEUE_COMMAND; 539 iu->iu_id = IU_ID_STATUS; 540 iu->tag = cpu_to_be16(cmd->tag); 541 542 /* 543 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 544 */ 545 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 546 iu->status = se_cmd->scsi_status; 547 stream->req_status->is_last = 1; 548 stream->req_status->stream_id = cmd->tag; 549 stream->req_status->context = cmd; 550 stream->req_status->length = se_cmd->scsi_sense_length + 16; 551 stream->req_status->buf = iu; 552 stream->req_status->complete = uasp_status_data_cmpl; 553 } 554 555 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 556 { 557 struct usbg_cmd *cmd = req->context; 558 struct f_uas *fu = cmd->fu; 559 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 560 int ret; 561 562 if (req->status == -ESHUTDOWN) 563 goto cleanup; 564 565 switch (cmd->state) { 566 case UASP_SEND_DATA: 567 ret = uasp_prepare_r_request(cmd); 568 if (ret) 569 goto cleanup; 570 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 571 if (ret) 572 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 573 break; 574 575 case UASP_RECEIVE_DATA: 576 ret = usbg_prepare_w_request(cmd, stream->req_out); 577 if (ret) 578 goto cleanup; 579 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 580 if (ret) 581 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 582 break; 583 584 case UASP_SEND_STATUS: 585 uasp_prepare_status(cmd); 586 ret = usb_ep_queue(fu->ep_status, stream->req_status, 587 GFP_ATOMIC); 588 if (ret) 589 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 590 break; 591 592 case UASP_QUEUE_COMMAND: 593 transport_generic_free_cmd(&cmd->se_cmd, 0); 594 usb_ep_queue(fu->ep_cmd, cmd->req, GFP_ATOMIC); 595 596 break; 597 598 default: 599 BUG(); 600 } 601 return; 602 603 cleanup: 604 transport_generic_free_cmd(&cmd->se_cmd, 0); 605 } 606 607 static int uasp_send_status_response(struct usbg_cmd *cmd) 608 { 609 struct f_uas *fu = cmd->fu; 610 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 611 struct sense_iu *iu = &cmd->sense_iu; 612 613 iu->tag = cpu_to_be16(cmd->tag); 614 cmd->fu = fu; 615 uasp_prepare_status(cmd); 616 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 617 } 618 619 static int uasp_send_read_response(struct usbg_cmd *cmd) 620 { 621 struct f_uas *fu = cmd->fu; 622 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 623 struct sense_iu *iu = &cmd->sense_iu; 624 int ret; 625 626 cmd->fu = fu; 627 628 iu->tag = cpu_to_be16(cmd->tag); 629 if (fu->flags & USBG_USE_STREAMS) { 630 631 ret = uasp_prepare_r_request(cmd); 632 if (ret) 633 goto out; 634 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 635 if (ret) { 636 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 637 kfree(cmd->data_buf); 638 cmd->data_buf = NULL; 639 } 640 641 } else { 642 643 iu->iu_id = IU_ID_READ_READY; 644 iu->tag = cpu_to_be16(cmd->tag); 645 646 stream->req_status->complete = uasp_status_data_cmpl; 647 stream->req_status->context = cmd; 648 649 cmd->state = UASP_SEND_DATA; 650 stream->req_status->buf = iu; 651 stream->req_status->length = sizeof(struct iu); 652 653 ret = usb_ep_queue(fu->ep_status, stream->req_status, 654 GFP_ATOMIC); 655 if (ret) 656 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 657 } 658 out: 659 return ret; 660 } 661 662 static int uasp_send_write_request(struct usbg_cmd *cmd) 663 { 664 struct f_uas *fu = cmd->fu; 665 struct se_cmd *se_cmd = &cmd->se_cmd; 666 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 667 struct sense_iu *iu = &cmd->sense_iu; 668 int ret; 669 670 cmd->fu = fu; 671 672 iu->tag = cpu_to_be16(cmd->tag); 673 674 if (fu->flags & USBG_USE_STREAMS) { 675 676 ret = usbg_prepare_w_request(cmd, stream->req_out); 677 if (ret) 678 goto cleanup; 679 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 680 if (ret) 681 pr_err("%s(%d)\n", __func__, __LINE__); 682 683 } else { 684 685 iu->iu_id = IU_ID_WRITE_READY; 686 iu->tag = cpu_to_be16(cmd->tag); 687 688 stream->req_status->complete = uasp_status_data_cmpl; 689 stream->req_status->context = cmd; 690 691 cmd->state = UASP_RECEIVE_DATA; 692 stream->req_status->buf = iu; 693 stream->req_status->length = sizeof(struct iu); 694 695 ret = usb_ep_queue(fu->ep_status, stream->req_status, 696 GFP_ATOMIC); 697 if (ret) 698 pr_err("%s(%d)\n", __func__, __LINE__); 699 } 700 701 cleanup: 702 return ret; 703 } 704 705 static int usbg_submit_command(struct f_uas *, struct usb_request *); 706 707 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 708 { 709 struct f_uas *fu = req->context; 710 711 if (req->status == -ESHUTDOWN) 712 return; 713 714 if (req->status < 0) { 715 usb_ep_queue(fu->ep_cmd, req, GFP_ATOMIC); 716 return; 717 } 718 719 usbg_submit_command(fu, req); 720 } 721 722 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 723 { 724 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 725 if (!stream->req_in) 726 goto out; 727 728 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 729 if (!stream->req_out) 730 goto err_out; 731 732 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 733 if (!stream->req_status) 734 goto err_sts; 735 736 return 0; 737 738 err_sts: 739 usb_ep_free_request(fu->ep_out, stream->req_out); 740 stream->req_out = NULL; 741 err_out: 742 usb_ep_free_request(fu->ep_in, stream->req_in); 743 stream->req_in = NULL; 744 out: 745 return -ENOMEM; 746 } 747 748 static int uasp_alloc_cmd(struct f_uas *fu, int i) 749 { 750 fu->cmd[i].req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 751 if (!fu->cmd[i].req) 752 goto err; 753 754 fu->cmd[i].buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 755 if (!fu->cmd[i].buf) 756 goto err_buf; 757 758 fu->cmd[i].req->complete = uasp_cmd_complete; 759 fu->cmd[i].req->buf = fu->cmd[i].buf; 760 fu->cmd[i].req->length = fu->ep_cmd->maxpacket; 761 fu->cmd[i].req->context = fu; 762 return 0; 763 764 err_buf: 765 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 766 err: 767 return -ENOMEM; 768 } 769 770 static int uasp_prepare_reqs(struct f_uas *fu) 771 { 772 int ret; 773 int i; 774 775 for (i = 0; i < USBG_NUM_CMDS; i++) { 776 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 777 if (ret) 778 goto err_cleanup; 779 } 780 781 for (i = 0; i < USBG_NUM_CMDS; i++) { 782 ret = uasp_alloc_cmd(fu, i); 783 if (ret) 784 goto err_free_stream; 785 786 ret = usb_ep_queue(fu->ep_cmd, fu->cmd[i].req, GFP_ATOMIC); 787 if (ret) 788 goto err_free_stream; 789 } 790 791 return 0; 792 793 err_free_stream: 794 uasp_free_cmdreq(fu); 795 796 err_cleanup: 797 if (i) { 798 do { 799 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 800 i--; 801 } while (i); 802 } 803 pr_err("UASP: endpoint setup failed\n"); 804 return ret; 805 } 806 807 static void uasp_set_alt(struct f_uas *fu) 808 { 809 struct usb_function *f = &fu->function; 810 struct usb_gadget *gadget = f->config->cdev->gadget; 811 int ret; 812 813 fu->flags = USBG_IS_UAS; 814 815 if (gadget->speed >= USB_SPEED_SUPER) 816 fu->flags |= USBG_USE_STREAMS; 817 818 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS); 819 ret = usb_ep_enable(fu->ep_in); 820 if (ret) 821 goto err_b_in; 822 823 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS); 824 ret = usb_ep_enable(fu->ep_out); 825 if (ret) 826 goto err_b_out; 827 828 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS); 829 ret = usb_ep_enable(fu->ep_cmd); 830 if (ret) 831 goto err_cmd; 832 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS); 833 ret = usb_ep_enable(fu->ep_status); 834 if (ret) 835 goto err_status; 836 837 ret = uasp_prepare_reqs(fu); 838 if (ret) 839 goto err_wq; 840 fu->flags |= USBG_ENABLED; 841 842 pr_info("Using the UAS protocol\n"); 843 return; 844 err_wq: 845 usb_ep_disable(fu->ep_status); 846 err_status: 847 usb_ep_disable(fu->ep_cmd); 848 err_cmd: 849 usb_ep_disable(fu->ep_out); 850 err_b_out: 851 usb_ep_disable(fu->ep_in); 852 err_b_in: 853 fu->flags = 0; 854 } 855 856 static int get_cmd_dir(const unsigned char *cdb) 857 { 858 int ret; 859 860 switch (cdb[0]) { 861 case READ_6: 862 case READ_10: 863 case READ_12: 864 case READ_16: 865 case INQUIRY: 866 case MODE_SENSE: 867 case MODE_SENSE_10: 868 case SERVICE_ACTION_IN_16: 869 case MAINTENANCE_IN: 870 case PERSISTENT_RESERVE_IN: 871 case SECURITY_PROTOCOL_IN: 872 case ACCESS_CONTROL_IN: 873 case REPORT_LUNS: 874 case READ_BLOCK_LIMITS: 875 case READ_POSITION: 876 case READ_CAPACITY: 877 case READ_TOC: 878 case READ_FORMAT_CAPACITIES: 879 case REQUEST_SENSE: 880 case ATA_12: 881 case ATA_16: 882 ret = DMA_FROM_DEVICE; 883 break; 884 885 case WRITE_6: 886 case WRITE_10: 887 case WRITE_12: 888 case WRITE_16: 889 case MODE_SELECT: 890 case MODE_SELECT_10: 891 case WRITE_VERIFY: 892 case WRITE_VERIFY_12: 893 case PERSISTENT_RESERVE_OUT: 894 case MAINTENANCE_OUT: 895 case SECURITY_PROTOCOL_OUT: 896 case ACCESS_CONTROL_OUT: 897 ret = DMA_TO_DEVICE; 898 break; 899 case ALLOW_MEDIUM_REMOVAL: 900 case TEST_UNIT_READY: 901 case SYNCHRONIZE_CACHE: 902 case START_STOP: 903 case ERASE: 904 case REZERO_UNIT: 905 case SEEK_10: 906 case SPACE: 907 case VERIFY: 908 case WRITE_FILEMARKS: 909 ret = DMA_NONE; 910 break; 911 default: 912 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 913 pr_warn(CMD_DIR_MSG, cdb[0]); 914 #undef CMD_DIR_MSG 915 ret = -EINVAL; 916 } 917 return ret; 918 } 919 920 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 921 { 922 struct usbg_cmd *cmd = req->context; 923 struct se_cmd *se_cmd = &cmd->se_cmd; 924 925 cmd->state = UASP_QUEUE_COMMAND; 926 927 if (req->status == -ESHUTDOWN) { 928 target_put_sess_cmd(se_cmd); 929 transport_generic_free_cmd(&cmd->se_cmd, 0); 930 return; 931 } 932 933 if (req->status) { 934 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 935 goto cleanup; 936 } 937 938 if (req->num_sgs == 0) { 939 sg_copy_from_buffer(se_cmd->t_data_sg, 940 se_cmd->t_data_nents, 941 cmd->data_buf, 942 se_cmd->data_length); 943 } 944 945 cmd->flags |= USBG_CMD_PENDING_DATA_WRITE; 946 queue_work(cmd->fu->tpg->workqueue, &cmd->work); 947 return; 948 949 cleanup: 950 target_put_sess_cmd(se_cmd); 951 transport_generic_free_cmd(&cmd->se_cmd, 0); 952 } 953 954 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 955 { 956 struct se_cmd *se_cmd = &cmd->se_cmd; 957 struct f_uas *fu = cmd->fu; 958 struct usb_gadget *gadget = fuas_to_gadget(fu); 959 960 if (!gadget->sg_supported) { 961 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 962 if (!cmd->data_buf) 963 return -ENOMEM; 964 965 req->buf = cmd->data_buf; 966 } else { 967 req->buf = NULL; 968 req->num_sgs = se_cmd->t_data_nents; 969 req->sg = se_cmd->t_data_sg; 970 } 971 972 req->is_last = 1; 973 req->stream_id = cmd->tag; 974 req->complete = usbg_data_write_cmpl; 975 req->length = se_cmd->data_length; 976 req->context = cmd; 977 978 cmd->state = UASP_SEND_STATUS; 979 return 0; 980 } 981 982 static int usbg_send_status_response(struct se_cmd *se_cmd) 983 { 984 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 985 se_cmd); 986 struct f_uas *fu = cmd->fu; 987 988 if (fu->flags & USBG_IS_BOT) 989 return bot_send_status_response(cmd); 990 else 991 return uasp_send_status_response(cmd); 992 } 993 994 static int usbg_send_write_request(struct se_cmd *se_cmd) 995 { 996 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 997 se_cmd); 998 struct f_uas *fu = cmd->fu; 999 1000 if (fu->flags & USBG_IS_BOT) 1001 return bot_send_write_request(cmd); 1002 else 1003 return uasp_send_write_request(cmd); 1004 } 1005 1006 static int usbg_send_read_response(struct se_cmd *se_cmd) 1007 { 1008 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1009 se_cmd); 1010 struct f_uas *fu = cmd->fu; 1011 1012 if (fu->flags & USBG_IS_BOT) 1013 return bot_send_read_response(cmd); 1014 else 1015 return uasp_send_read_response(cmd); 1016 } 1017 1018 static void usbg_cmd_work(struct work_struct *work) 1019 { 1020 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1021 struct se_cmd *se_cmd; 1022 struct tcm_usbg_nexus *tv_nexus; 1023 struct usbg_tpg *tpg; 1024 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1025 1026 /* 1027 * Note: each command will spawn its own process, and each stage of the 1028 * command is processed sequentially. Should this no longer be the case, 1029 * locking is needed. 1030 */ 1031 if (cmd->flags & USBG_CMD_PENDING_DATA_WRITE) { 1032 target_execute_cmd(&cmd->se_cmd); 1033 cmd->flags &= ~USBG_CMD_PENDING_DATA_WRITE; 1034 return; 1035 } 1036 1037 se_cmd = &cmd->se_cmd; 1038 tpg = cmd->fu->tpg; 1039 tv_nexus = tpg->tpg_nexus; 1040 dir = get_cmd_dir(cmd->cmd_buf); 1041 if (dir < 0) { 1042 __target_init_cmd(se_cmd, 1043 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1044 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1045 cmd->prio_attr, cmd->sense_iu.sense, 1046 cmd->unpacked_lun, NULL); 1047 goto out; 1048 } 1049 1050 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1051 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1052 cmd->prio_attr, dir, flags); 1053 1054 return; 1055 1056 out: 1057 transport_send_check_condition_and_sense(se_cmd, 1058 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1059 } 1060 1061 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1062 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1063 { 1064 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1065 struct usbg_cmd *cmd; 1066 int tag, cpu; 1067 1068 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1069 if (tag < 0) 1070 return ERR_PTR(-ENOMEM); 1071 1072 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1073 memset(cmd, 0, sizeof(*cmd)); 1074 cmd->se_cmd.map_tag = tag; 1075 cmd->se_cmd.map_cpu = cpu; 1076 cmd->se_cmd.cpuid = cpu; 1077 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1078 cmd->fu = fu; 1079 1080 return cmd; 1081 } 1082 1083 static void usbg_release_cmd(struct se_cmd *); 1084 1085 static int usbg_submit_command(struct f_uas *fu, struct usb_request *req) 1086 { 1087 struct command_iu *cmd_iu = req->buf; 1088 struct usbg_cmd *cmd; 1089 struct usbg_tpg *tpg = fu->tpg; 1090 struct tcm_usbg_nexus *tv_nexus; 1091 u32 cmd_len; 1092 u16 scsi_tag; 1093 1094 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1095 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1096 return -EINVAL; 1097 } 1098 1099 tv_nexus = tpg->tpg_nexus; 1100 if (!tv_nexus) { 1101 pr_err("Missing nexus, ignoring command\n"); 1102 return -EINVAL; 1103 } 1104 1105 cmd_len = (cmd_iu->len & ~0x3) + 16; 1106 if (cmd_len > USBG_MAX_CMD) 1107 return -EINVAL; 1108 1109 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1110 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1111 if (IS_ERR(cmd)) { 1112 pr_err("usbg_get_cmd failed\n"); 1113 return -ENOMEM; 1114 } 1115 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1116 1117 switch (cmd_iu->prio_attr & 0x7) { 1118 case UAS_HEAD_TAG: 1119 cmd->prio_attr = TCM_HEAD_TAG; 1120 break; 1121 case UAS_ORDERED_TAG: 1122 cmd->prio_attr = TCM_ORDERED_TAG; 1123 break; 1124 case UAS_ACA: 1125 cmd->prio_attr = TCM_ACA_TAG; 1126 break; 1127 default: 1128 pr_debug_once("Unsupported prio_attr: %02x.\n", 1129 cmd_iu->prio_attr); 1130 fallthrough; 1131 case UAS_SIMPLE_TAG: 1132 cmd->prio_attr = TCM_SIMPLE_TAG; 1133 break; 1134 } 1135 1136 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1137 cmd->req = req; 1138 cmd->flags = 0; 1139 1140 INIT_WORK(&cmd->work, usbg_cmd_work); 1141 queue_work(tpg->workqueue, &cmd->work); 1142 1143 return 0; 1144 } 1145 1146 static void bot_cmd_work(struct work_struct *work) 1147 { 1148 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1149 struct se_cmd *se_cmd; 1150 struct tcm_usbg_nexus *tv_nexus; 1151 struct usbg_tpg *tpg; 1152 int dir; 1153 1154 /* 1155 * Note: each command will spawn its own process, and each stage of the 1156 * command is processed sequentially. Should this no longer be the case, 1157 * locking is needed. 1158 */ 1159 if (cmd->flags & USBG_CMD_PENDING_DATA_WRITE) { 1160 target_execute_cmd(&cmd->se_cmd); 1161 cmd->flags &= ~USBG_CMD_PENDING_DATA_WRITE; 1162 return; 1163 } 1164 1165 se_cmd = &cmd->se_cmd; 1166 tpg = cmd->fu->tpg; 1167 tv_nexus = tpg->tpg_nexus; 1168 dir = get_cmd_dir(cmd->cmd_buf); 1169 if (dir < 0) { 1170 __target_init_cmd(se_cmd, 1171 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1172 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1173 cmd->prio_attr, cmd->sense_iu.sense, 1174 cmd->unpacked_lun, NULL); 1175 goto out; 1176 } 1177 1178 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1179 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1180 cmd->data_len, cmd->prio_attr, dir, 0); 1181 return; 1182 1183 out: 1184 transport_send_check_condition_and_sense(se_cmd, 1185 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1186 } 1187 1188 static int bot_submit_command(struct f_uas *fu, 1189 void *cmdbuf, unsigned int len) 1190 { 1191 struct bulk_cb_wrap *cbw = cmdbuf; 1192 struct usbg_cmd *cmd; 1193 struct usbg_tpg *tpg = fu->tpg; 1194 struct tcm_usbg_nexus *tv_nexus; 1195 u32 cmd_len; 1196 1197 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1198 pr_err("Wrong signature on CBW\n"); 1199 return -EINVAL; 1200 } 1201 if (len != 31) { 1202 pr_err("Wrong length for CBW\n"); 1203 return -EINVAL; 1204 } 1205 1206 cmd_len = cbw->Length; 1207 if (cmd_len < 1 || cmd_len > 16) 1208 return -EINVAL; 1209 1210 tv_nexus = tpg->tpg_nexus; 1211 if (!tv_nexus) { 1212 pr_err("Missing nexus, ignoring command\n"); 1213 return -ENODEV; 1214 } 1215 1216 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1217 if (IS_ERR(cmd)) { 1218 pr_err("usbg_get_cmd failed\n"); 1219 return -ENOMEM; 1220 } 1221 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1222 1223 cmd->bot_tag = cbw->Tag; 1224 cmd->prio_attr = TCM_SIMPLE_TAG; 1225 cmd->unpacked_lun = cbw->Lun; 1226 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1227 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1228 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1229 cmd->flags = 0; 1230 1231 INIT_WORK(&cmd->work, bot_cmd_work); 1232 queue_work(tpg->workqueue, &cmd->work); 1233 1234 return 0; 1235 } 1236 1237 /* Start fabric.c code */ 1238 1239 static int usbg_check_true(struct se_portal_group *se_tpg) 1240 { 1241 return 1; 1242 } 1243 1244 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1245 { 1246 struct usbg_tpg *tpg = container_of(se_tpg, 1247 struct usbg_tpg, se_tpg); 1248 struct usbg_tport *tport = tpg->tport; 1249 1250 return &tport->tport_name[0]; 1251 } 1252 1253 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1254 { 1255 struct usbg_tpg *tpg = container_of(se_tpg, 1256 struct usbg_tpg, se_tpg); 1257 return tpg->tport_tpgt; 1258 } 1259 1260 static void usbg_release_cmd(struct se_cmd *se_cmd) 1261 { 1262 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1263 se_cmd); 1264 struct se_session *se_sess = se_cmd->se_sess; 1265 1266 kfree(cmd->data_buf); 1267 target_free_tag(se_sess, se_cmd); 1268 } 1269 1270 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1271 { 1272 } 1273 1274 static void usbg_aborted_task(struct se_cmd *se_cmd) 1275 { 1276 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, se_cmd); 1277 struct f_uas *fu = cmd->fu; 1278 struct usb_gadget *gadget = fuas_to_gadget(fu); 1279 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 1280 int ret = 0; 1281 1282 if (stream->req_out->status == -EINPROGRESS) 1283 ret = usb_ep_dequeue(fu->ep_out, stream->req_out); 1284 else if (stream->req_in->status == -EINPROGRESS) 1285 ret = usb_ep_dequeue(fu->ep_in, stream->req_in); 1286 else if (stream->req_status->status == -EINPROGRESS) 1287 ret = usb_ep_dequeue(fu->ep_status, stream->req_status); 1288 1289 if (ret) 1290 dev_err(&gadget->dev, "Failed to abort cmd tag %d, (%d)\n", 1291 cmd->tag, ret); 1292 1293 cmd->state = UASP_QUEUE_COMMAND; 1294 } 1295 1296 static const char *usbg_check_wwn(const char *name) 1297 { 1298 const char *n; 1299 unsigned int len; 1300 1301 n = strstr(name, "naa."); 1302 if (!n) 1303 return NULL; 1304 n += 4; 1305 len = strlen(n); 1306 if (len == 0 || len > USBG_NAMELEN - 1) 1307 return NULL; 1308 return n; 1309 } 1310 1311 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1312 { 1313 if (!usbg_check_wwn(name)) 1314 return -EINVAL; 1315 return 0; 1316 } 1317 1318 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1319 const char *name) 1320 { 1321 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1322 tport_wwn); 1323 struct usbg_tpg *tpg; 1324 unsigned long tpgt; 1325 int ret; 1326 struct f_tcm_opts *opts; 1327 unsigned i; 1328 1329 if (strstr(name, "tpgt_") != name) 1330 return ERR_PTR(-EINVAL); 1331 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1332 return ERR_PTR(-EINVAL); 1333 ret = -ENODEV; 1334 mutex_lock(&tpg_instances_lock); 1335 for (i = 0; i < TPG_INSTANCES; ++i) 1336 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1337 break; 1338 if (i == TPG_INSTANCES) 1339 goto unlock_inst; 1340 1341 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1342 func_inst); 1343 mutex_lock(&opts->dep_lock); 1344 if (!opts->ready) 1345 goto unlock_dep; 1346 1347 if (opts->has_dep) { 1348 if (!try_module_get(opts->dependent)) 1349 goto unlock_dep; 1350 } else { 1351 ret = configfs_depend_item_unlocked( 1352 wwn->wwn_group.cg_subsys, 1353 &opts->func_inst.group.cg_item); 1354 if (ret) 1355 goto unlock_dep; 1356 } 1357 1358 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1359 ret = -ENOMEM; 1360 if (!tpg) 1361 goto unref_dep; 1362 mutex_init(&tpg->tpg_mutex); 1363 atomic_set(&tpg->tpg_port_count, 0); 1364 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 1365 WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE); 1366 if (!tpg->workqueue) 1367 goto free_tpg; 1368 1369 tpg->tport = tport; 1370 tpg->tport_tpgt = tpgt; 1371 1372 /* 1373 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1374 * pretend to be SAS.. 1375 */ 1376 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1377 if (ret < 0) 1378 goto free_workqueue; 1379 1380 tpg_instances[i].tpg = tpg; 1381 tpg->fi = tpg_instances[i].func_inst; 1382 mutex_unlock(&opts->dep_lock); 1383 mutex_unlock(&tpg_instances_lock); 1384 return &tpg->se_tpg; 1385 1386 free_workqueue: 1387 destroy_workqueue(tpg->workqueue); 1388 free_tpg: 1389 kfree(tpg); 1390 unref_dep: 1391 if (opts->has_dep) 1392 module_put(opts->dependent); 1393 else 1394 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1395 unlock_dep: 1396 mutex_unlock(&opts->dep_lock); 1397 unlock_inst: 1398 mutex_unlock(&tpg_instances_lock); 1399 1400 return ERR_PTR(ret); 1401 } 1402 1403 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1404 1405 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1406 { 1407 struct usbg_tpg *tpg = container_of(se_tpg, 1408 struct usbg_tpg, se_tpg); 1409 unsigned i; 1410 struct f_tcm_opts *opts; 1411 1412 tcm_usbg_drop_nexus(tpg); 1413 core_tpg_deregister(se_tpg); 1414 destroy_workqueue(tpg->workqueue); 1415 1416 mutex_lock(&tpg_instances_lock); 1417 for (i = 0; i < TPG_INSTANCES; ++i) 1418 if (tpg_instances[i].tpg == tpg) 1419 break; 1420 if (i < TPG_INSTANCES) { 1421 tpg_instances[i].tpg = NULL; 1422 opts = container_of(tpg_instances[i].func_inst, 1423 struct f_tcm_opts, func_inst); 1424 mutex_lock(&opts->dep_lock); 1425 if (opts->has_dep) 1426 module_put(opts->dependent); 1427 else 1428 configfs_undepend_item_unlocked( 1429 &opts->func_inst.group.cg_item); 1430 mutex_unlock(&opts->dep_lock); 1431 } 1432 mutex_unlock(&tpg_instances_lock); 1433 1434 kfree(tpg); 1435 } 1436 1437 static struct se_wwn *usbg_make_tport( 1438 struct target_fabric_configfs *tf, 1439 struct config_group *group, 1440 const char *name) 1441 { 1442 struct usbg_tport *tport; 1443 const char *wnn_name; 1444 u64 wwpn = 0; 1445 1446 wnn_name = usbg_check_wwn(name); 1447 if (!wnn_name) 1448 return ERR_PTR(-EINVAL); 1449 1450 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1451 if (!(tport)) 1452 return ERR_PTR(-ENOMEM); 1453 1454 tport->tport_wwpn = wwpn; 1455 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1456 return &tport->tport_wwn; 1457 } 1458 1459 static void usbg_drop_tport(struct se_wwn *wwn) 1460 { 1461 struct usbg_tport *tport = container_of(wwn, 1462 struct usbg_tport, tport_wwn); 1463 kfree(tport); 1464 } 1465 1466 /* 1467 * If somebody feels like dropping the version property, go ahead. 1468 */ 1469 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1470 { 1471 return sprintf(page, "usb-gadget fabric module\n"); 1472 } 1473 1474 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1475 1476 static struct configfs_attribute *usbg_wwn_attrs[] = { 1477 &usbg_wwn_attr_version, 1478 NULL, 1479 }; 1480 1481 static int usbg_attach(struct usbg_tpg *); 1482 static void usbg_detach(struct usbg_tpg *); 1483 1484 static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable) 1485 { 1486 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1487 int ret = 0; 1488 1489 if (enable) 1490 ret = usbg_attach(tpg); 1491 else 1492 usbg_detach(tpg); 1493 if (ret) 1494 return ret; 1495 1496 tpg->gadget_connect = enable; 1497 1498 return 0; 1499 } 1500 1501 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1502 { 1503 struct se_portal_group *se_tpg = to_tpg(item); 1504 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1505 struct tcm_usbg_nexus *tv_nexus; 1506 ssize_t ret; 1507 1508 mutex_lock(&tpg->tpg_mutex); 1509 tv_nexus = tpg->tpg_nexus; 1510 if (!tv_nexus) { 1511 ret = -ENODEV; 1512 goto out; 1513 } 1514 ret = sysfs_emit(page, "%s\n", 1515 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1516 out: 1517 mutex_unlock(&tpg->tpg_mutex); 1518 return ret; 1519 } 1520 1521 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1522 struct se_session *se_sess, void *p) 1523 { 1524 struct usbg_tpg *tpg = container_of(se_tpg, 1525 struct usbg_tpg, se_tpg); 1526 1527 tpg->tpg_nexus = p; 1528 return 0; 1529 } 1530 1531 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1532 { 1533 struct tcm_usbg_nexus *tv_nexus; 1534 int ret = 0; 1535 1536 mutex_lock(&tpg->tpg_mutex); 1537 if (tpg->tpg_nexus) { 1538 ret = -EEXIST; 1539 pr_debug("tpg->tpg_nexus already exists\n"); 1540 goto out_unlock; 1541 } 1542 1543 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1544 if (!tv_nexus) { 1545 ret = -ENOMEM; 1546 goto out_unlock; 1547 } 1548 1549 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1550 USB_G_DEFAULT_SESSION_TAGS, 1551 sizeof(struct usbg_cmd), 1552 TARGET_PROT_NORMAL, name, 1553 tv_nexus, usbg_alloc_sess_cb); 1554 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1555 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1556 pr_debug(MAKE_NEXUS_MSG, name); 1557 #undef MAKE_NEXUS_MSG 1558 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1559 kfree(tv_nexus); 1560 } 1561 1562 out_unlock: 1563 mutex_unlock(&tpg->tpg_mutex); 1564 return ret; 1565 } 1566 1567 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1568 { 1569 struct se_session *se_sess; 1570 struct tcm_usbg_nexus *tv_nexus; 1571 int ret = -ENODEV; 1572 1573 mutex_lock(&tpg->tpg_mutex); 1574 tv_nexus = tpg->tpg_nexus; 1575 if (!tv_nexus) 1576 goto out; 1577 1578 se_sess = tv_nexus->tvn_se_sess; 1579 if (!se_sess) 1580 goto out; 1581 1582 if (atomic_read(&tpg->tpg_port_count)) { 1583 ret = -EPERM; 1584 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1585 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1586 #undef MSG 1587 goto out; 1588 } 1589 1590 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1591 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1592 /* 1593 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1594 */ 1595 target_remove_session(se_sess); 1596 tpg->tpg_nexus = NULL; 1597 1598 kfree(tv_nexus); 1599 ret = 0; 1600 out: 1601 mutex_unlock(&tpg->tpg_mutex); 1602 return ret; 1603 } 1604 1605 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1606 const char *page, size_t count) 1607 { 1608 struct se_portal_group *se_tpg = to_tpg(item); 1609 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1610 unsigned char i_port[USBG_NAMELEN], *ptr; 1611 int ret; 1612 1613 if (!strncmp(page, "NULL", 4)) { 1614 ret = tcm_usbg_drop_nexus(tpg); 1615 return (!ret) ? count : ret; 1616 } 1617 if (strlen(page) >= USBG_NAMELEN) { 1618 1619 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1620 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1621 #undef NEXUS_STORE_MSG 1622 return -EINVAL; 1623 } 1624 snprintf(i_port, USBG_NAMELEN, "%s", page); 1625 1626 ptr = strstr(i_port, "naa."); 1627 if (!ptr) { 1628 pr_err("Missing 'naa.' prefix\n"); 1629 return -EINVAL; 1630 } 1631 1632 if (i_port[strlen(i_port) - 1] == '\n') 1633 i_port[strlen(i_port) - 1] = '\0'; 1634 1635 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1636 if (ret < 0) 1637 return ret; 1638 return count; 1639 } 1640 1641 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1642 1643 static struct configfs_attribute *usbg_base_attrs[] = { 1644 &tcm_usbg_tpg_attr_nexus, 1645 NULL, 1646 }; 1647 1648 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1649 { 1650 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1651 1652 atomic_inc(&tpg->tpg_port_count); 1653 smp_mb__after_atomic(); 1654 return 0; 1655 } 1656 1657 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1658 struct se_lun *se_lun) 1659 { 1660 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1661 1662 atomic_dec(&tpg->tpg_port_count); 1663 smp_mb__after_atomic(); 1664 } 1665 1666 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1667 { 1668 return target_put_sess_cmd(se_cmd); 1669 } 1670 1671 static const struct target_core_fabric_ops usbg_ops = { 1672 .module = THIS_MODULE, 1673 .fabric_name = "usb_gadget", 1674 .tpg_get_wwn = usbg_get_fabric_wwn, 1675 .tpg_get_tag = usbg_get_tag, 1676 .tpg_check_demo_mode = usbg_check_true, 1677 .release_cmd = usbg_release_cmd, 1678 .sess_get_initiator_sid = NULL, 1679 .write_pending = usbg_send_write_request, 1680 .queue_data_in = usbg_send_read_response, 1681 .queue_status = usbg_send_status_response, 1682 .queue_tm_rsp = usbg_queue_tm_rsp, 1683 .aborted_task = usbg_aborted_task, 1684 .check_stop_free = usbg_check_stop_free, 1685 1686 .fabric_make_wwn = usbg_make_tport, 1687 .fabric_drop_wwn = usbg_drop_tport, 1688 .fabric_make_tpg = usbg_make_tpg, 1689 .fabric_enable_tpg = usbg_enable_tpg, 1690 .fabric_drop_tpg = usbg_drop_tpg, 1691 .fabric_post_link = usbg_port_link, 1692 .fabric_pre_unlink = usbg_port_unlink, 1693 .fabric_init_nodeacl = usbg_init_nodeacl, 1694 1695 .tfc_wwn_attrs = usbg_wwn_attrs, 1696 .tfc_tpg_base_attrs = usbg_base_attrs, 1697 1698 .default_submit_type = TARGET_DIRECT_SUBMIT, 1699 .direct_submit_supp = 1, 1700 }; 1701 1702 /* Start gadget.c code */ 1703 1704 static struct usb_interface_descriptor bot_intf_desc = { 1705 .bLength = sizeof(bot_intf_desc), 1706 .bDescriptorType = USB_DT_INTERFACE, 1707 .bNumEndpoints = 2, 1708 .bAlternateSetting = USB_G_ALT_INT_BBB, 1709 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1710 .bInterfaceSubClass = USB_SC_SCSI, 1711 .bInterfaceProtocol = USB_PR_BULK, 1712 }; 1713 1714 static struct usb_interface_descriptor uasp_intf_desc = { 1715 .bLength = sizeof(uasp_intf_desc), 1716 .bDescriptorType = USB_DT_INTERFACE, 1717 .bNumEndpoints = 4, 1718 .bAlternateSetting = USB_G_ALT_INT_UAS, 1719 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1720 .bInterfaceSubClass = USB_SC_SCSI, 1721 .bInterfaceProtocol = USB_PR_UAS, 1722 }; 1723 1724 static struct usb_endpoint_descriptor uasp_bi_desc = { 1725 .bLength = USB_DT_ENDPOINT_SIZE, 1726 .bDescriptorType = USB_DT_ENDPOINT, 1727 .bEndpointAddress = USB_DIR_IN, 1728 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1729 .wMaxPacketSize = cpu_to_le16(512), 1730 }; 1731 1732 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1733 .bLength = USB_DT_ENDPOINT_SIZE, 1734 .bDescriptorType = USB_DT_ENDPOINT, 1735 .bEndpointAddress = USB_DIR_IN, 1736 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1737 }; 1738 1739 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1740 .bLength = sizeof(uasp_bi_pipe_desc), 1741 .bDescriptorType = USB_DT_PIPE_USAGE, 1742 .bPipeID = DATA_IN_PIPE_ID, 1743 }; 1744 1745 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1746 .bLength = USB_DT_ENDPOINT_SIZE, 1747 .bDescriptorType = USB_DT_ENDPOINT, 1748 .bEndpointAddress = USB_DIR_IN, 1749 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1750 .wMaxPacketSize = cpu_to_le16(1024), 1751 }; 1752 1753 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1754 .bLength = sizeof(uasp_bi_ep_comp_desc), 1755 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1756 .bMaxBurst = 15, 1757 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1758 .wBytesPerInterval = 0, 1759 }; 1760 1761 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1762 .bLength = sizeof(bot_bi_ep_comp_desc), 1763 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1764 .bMaxBurst = 15, 1765 }; 1766 1767 static struct usb_endpoint_descriptor uasp_bo_desc = { 1768 .bLength = USB_DT_ENDPOINT_SIZE, 1769 .bDescriptorType = USB_DT_ENDPOINT, 1770 .bEndpointAddress = USB_DIR_OUT, 1771 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1772 .wMaxPacketSize = cpu_to_le16(512), 1773 }; 1774 1775 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1776 .bLength = USB_DT_ENDPOINT_SIZE, 1777 .bDescriptorType = USB_DT_ENDPOINT, 1778 .bEndpointAddress = USB_DIR_OUT, 1779 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1780 }; 1781 1782 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1783 .bLength = sizeof(uasp_bo_pipe_desc), 1784 .bDescriptorType = USB_DT_PIPE_USAGE, 1785 .bPipeID = DATA_OUT_PIPE_ID, 1786 }; 1787 1788 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1789 .bLength = USB_DT_ENDPOINT_SIZE, 1790 .bDescriptorType = USB_DT_ENDPOINT, 1791 .bEndpointAddress = USB_DIR_OUT, 1792 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1793 .wMaxPacketSize = cpu_to_le16(0x400), 1794 }; 1795 1796 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1797 .bLength = sizeof(uasp_bo_ep_comp_desc), 1798 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1799 .bMaxBurst = 15, 1800 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1801 }; 1802 1803 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1804 .bLength = sizeof(bot_bo_ep_comp_desc), 1805 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1806 .bMaxBurst = 15, 1807 }; 1808 1809 static struct usb_endpoint_descriptor uasp_status_desc = { 1810 .bLength = USB_DT_ENDPOINT_SIZE, 1811 .bDescriptorType = USB_DT_ENDPOINT, 1812 .bEndpointAddress = USB_DIR_IN, 1813 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1814 .wMaxPacketSize = cpu_to_le16(512), 1815 }; 1816 1817 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1818 .bLength = USB_DT_ENDPOINT_SIZE, 1819 .bDescriptorType = USB_DT_ENDPOINT, 1820 .bEndpointAddress = USB_DIR_IN, 1821 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1822 }; 1823 1824 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1825 .bLength = sizeof(uasp_status_pipe_desc), 1826 .bDescriptorType = USB_DT_PIPE_USAGE, 1827 .bPipeID = STATUS_PIPE_ID, 1828 }; 1829 1830 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1831 .bLength = USB_DT_ENDPOINT_SIZE, 1832 .bDescriptorType = USB_DT_ENDPOINT, 1833 .bEndpointAddress = USB_DIR_IN, 1834 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1835 .wMaxPacketSize = cpu_to_le16(1024), 1836 }; 1837 1838 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1839 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1840 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1841 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1842 }; 1843 1844 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1845 .bLength = USB_DT_ENDPOINT_SIZE, 1846 .bDescriptorType = USB_DT_ENDPOINT, 1847 .bEndpointAddress = USB_DIR_OUT, 1848 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1849 .wMaxPacketSize = cpu_to_le16(512), 1850 }; 1851 1852 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1853 .bLength = USB_DT_ENDPOINT_SIZE, 1854 .bDescriptorType = USB_DT_ENDPOINT, 1855 .bEndpointAddress = USB_DIR_OUT, 1856 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1857 }; 1858 1859 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1860 .bLength = sizeof(uasp_cmd_pipe_desc), 1861 .bDescriptorType = USB_DT_PIPE_USAGE, 1862 .bPipeID = CMD_PIPE_ID, 1863 }; 1864 1865 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1866 .bLength = USB_DT_ENDPOINT_SIZE, 1867 .bDescriptorType = USB_DT_ENDPOINT, 1868 .bEndpointAddress = USB_DIR_OUT, 1869 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1870 .wMaxPacketSize = cpu_to_le16(1024), 1871 }; 1872 1873 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1874 .bLength = sizeof(uasp_cmd_comp_desc), 1875 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1876 }; 1877 1878 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1879 (struct usb_descriptor_header *) &bot_intf_desc, 1880 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1881 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1882 1883 (struct usb_descriptor_header *) &uasp_intf_desc, 1884 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1885 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1886 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1887 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1888 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1889 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1890 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1891 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1892 NULL, 1893 }; 1894 1895 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1896 (struct usb_descriptor_header *) &bot_intf_desc, 1897 (struct usb_descriptor_header *) &uasp_bi_desc, 1898 (struct usb_descriptor_header *) &uasp_bo_desc, 1899 1900 (struct usb_descriptor_header *) &uasp_intf_desc, 1901 (struct usb_descriptor_header *) &uasp_bi_desc, 1902 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1903 (struct usb_descriptor_header *) &uasp_bo_desc, 1904 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1905 (struct usb_descriptor_header *) &uasp_status_desc, 1906 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1907 (struct usb_descriptor_header *) &uasp_cmd_desc, 1908 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1909 NULL, 1910 }; 1911 1912 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1913 (struct usb_descriptor_header *) &bot_intf_desc, 1914 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1915 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1916 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1917 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1918 1919 (struct usb_descriptor_header *) &uasp_intf_desc, 1920 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1921 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1922 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1923 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1924 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1925 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1926 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1927 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1928 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1929 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1930 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1931 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1932 NULL, 1933 }; 1934 1935 static struct usb_string tcm_us_strings[] = { 1936 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1937 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1938 { }, 1939 }; 1940 1941 static struct usb_gadget_strings tcm_stringtab = { 1942 .language = 0x0409, 1943 .strings = tcm_us_strings, 1944 }; 1945 1946 static struct usb_gadget_strings *tcm_strings[] = { 1947 &tcm_stringtab, 1948 NULL, 1949 }; 1950 1951 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1952 { 1953 struct f_uas *fu = to_f_uas(f); 1954 struct usb_string *us; 1955 struct usb_gadget *gadget = c->cdev->gadget; 1956 struct usb_ep *ep; 1957 struct f_tcm_opts *opts; 1958 int iface; 1959 int ret; 1960 1961 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1962 1963 mutex_lock(&opts->dep_lock); 1964 if (!opts->can_attach) { 1965 mutex_unlock(&opts->dep_lock); 1966 return -ENODEV; 1967 } 1968 mutex_unlock(&opts->dep_lock); 1969 us = usb_gstrings_attach(c->cdev, tcm_strings, 1970 ARRAY_SIZE(tcm_us_strings)); 1971 if (IS_ERR(us)) 1972 return PTR_ERR(us); 1973 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 1974 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 1975 1976 iface = usb_interface_id(c, f); 1977 if (iface < 0) 1978 return iface; 1979 1980 bot_intf_desc.bInterfaceNumber = iface; 1981 uasp_intf_desc.bInterfaceNumber = iface; 1982 fu->iface = iface; 1983 ep = usb_ep_autoconfig(gadget, &uasp_fs_bi_desc); 1984 if (!ep) 1985 goto ep_fail; 1986 1987 fu->ep_in = ep; 1988 1989 ep = usb_ep_autoconfig(gadget, &uasp_fs_bo_desc); 1990 if (!ep) 1991 goto ep_fail; 1992 fu->ep_out = ep; 1993 1994 ep = usb_ep_autoconfig(gadget, &uasp_fs_status_desc); 1995 if (!ep) 1996 goto ep_fail; 1997 fu->ep_status = ep; 1998 1999 ep = usb_ep_autoconfig(gadget, &uasp_fs_cmd_desc); 2000 if (!ep) 2001 goto ep_fail; 2002 fu->ep_cmd = ep; 2003 2004 /* Assume endpoint addresses are the same for both speeds */ 2005 uasp_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 2006 uasp_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 2007 uasp_status_desc.bEndpointAddress = 2008 uasp_fs_status_desc.bEndpointAddress; 2009 uasp_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 2010 2011 uasp_ss_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 2012 uasp_ss_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 2013 uasp_ss_status_desc.bEndpointAddress = 2014 uasp_fs_status_desc.bEndpointAddress; 2015 uasp_ss_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 2016 2017 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2018 uasp_hs_function_desc, uasp_ss_function_desc, 2019 uasp_ss_function_desc); 2020 if (ret) 2021 goto ep_fail; 2022 2023 return 0; 2024 ep_fail: 2025 pr_err("Can't claim all required eps\n"); 2026 2027 return -ENOTSUPP; 2028 } 2029 2030 struct guas_setup_wq { 2031 struct work_struct work; 2032 struct f_uas *fu; 2033 unsigned int alt; 2034 }; 2035 2036 static void tcm_delayed_set_alt(struct work_struct *wq) 2037 { 2038 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2039 work); 2040 struct f_uas *fu = work->fu; 2041 int alt = work->alt; 2042 2043 kfree(work); 2044 2045 if (fu->flags & USBG_IS_BOT) 2046 bot_cleanup_old_alt(fu); 2047 if (fu->flags & USBG_IS_UAS) 2048 uasp_cleanup_old_alt(fu); 2049 2050 if (alt == USB_G_ALT_INT_BBB) 2051 bot_set_alt(fu); 2052 else if (alt == USB_G_ALT_INT_UAS) 2053 uasp_set_alt(fu); 2054 usb_composite_setup_continue(fu->function.config->cdev); 2055 } 2056 2057 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2058 { 2059 struct f_uas *fu = to_f_uas(f); 2060 2061 if (fu->iface != intf) 2062 return -EOPNOTSUPP; 2063 2064 if (fu->flags & USBG_IS_BOT) 2065 return USB_G_ALT_INT_BBB; 2066 else if (fu->flags & USBG_IS_UAS) 2067 return USB_G_ALT_INT_UAS; 2068 2069 return -EOPNOTSUPP; 2070 } 2071 2072 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2073 { 2074 struct f_uas *fu = to_f_uas(f); 2075 2076 if (fu->iface != intf) 2077 return -EOPNOTSUPP; 2078 2079 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2080 struct guas_setup_wq *work; 2081 2082 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2083 if (!work) 2084 return -ENOMEM; 2085 INIT_WORK(&work->work, tcm_delayed_set_alt); 2086 work->fu = fu; 2087 work->alt = alt; 2088 schedule_work(&work->work); 2089 return USB_GADGET_DELAYED_STATUS; 2090 } 2091 return -EOPNOTSUPP; 2092 } 2093 2094 static void tcm_disable(struct usb_function *f) 2095 { 2096 struct f_uas *fu = to_f_uas(f); 2097 2098 if (fu->flags & USBG_IS_UAS) 2099 uasp_cleanup_old_alt(fu); 2100 else if (fu->flags & USBG_IS_BOT) 2101 bot_cleanup_old_alt(fu); 2102 fu->flags = 0; 2103 } 2104 2105 static int tcm_setup(struct usb_function *f, 2106 const struct usb_ctrlrequest *ctrl) 2107 { 2108 struct f_uas *fu = to_f_uas(f); 2109 2110 if (!(fu->flags & USBG_IS_BOT)) 2111 return -EOPNOTSUPP; 2112 2113 return usbg_bot_setup(f, ctrl); 2114 } 2115 2116 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2117 { 2118 return container_of(to_config_group(item), struct f_tcm_opts, 2119 func_inst.group); 2120 } 2121 2122 static void tcm_attr_release(struct config_item *item) 2123 { 2124 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2125 2126 usb_put_function_instance(&opts->func_inst); 2127 } 2128 2129 static struct configfs_item_operations tcm_item_ops = { 2130 .release = tcm_attr_release, 2131 }; 2132 2133 static const struct config_item_type tcm_func_type = { 2134 .ct_item_ops = &tcm_item_ops, 2135 .ct_owner = THIS_MODULE, 2136 }; 2137 2138 static void tcm_free_inst(struct usb_function_instance *f) 2139 { 2140 struct f_tcm_opts *opts; 2141 unsigned i; 2142 2143 opts = container_of(f, struct f_tcm_opts, func_inst); 2144 2145 mutex_lock(&tpg_instances_lock); 2146 for (i = 0; i < TPG_INSTANCES; ++i) 2147 if (tpg_instances[i].func_inst == f) 2148 break; 2149 if (i < TPG_INSTANCES) 2150 tpg_instances[i].func_inst = NULL; 2151 mutex_unlock(&tpg_instances_lock); 2152 2153 kfree(opts); 2154 } 2155 2156 static int tcm_register_callback(struct usb_function_instance *f) 2157 { 2158 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2159 2160 mutex_lock(&opts->dep_lock); 2161 opts->can_attach = true; 2162 mutex_unlock(&opts->dep_lock); 2163 2164 return 0; 2165 } 2166 2167 static void tcm_unregister_callback(struct usb_function_instance *f) 2168 { 2169 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2170 2171 mutex_lock(&opts->dep_lock); 2172 unregister_gadget_item(opts-> 2173 func_inst.group.cg_item.ci_parent->ci_parent); 2174 opts->can_attach = false; 2175 mutex_unlock(&opts->dep_lock); 2176 } 2177 2178 static int usbg_attach(struct usbg_tpg *tpg) 2179 { 2180 struct usb_function_instance *f = tpg->fi; 2181 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2182 2183 if (opts->tcm_register_callback) 2184 return opts->tcm_register_callback(f); 2185 2186 return 0; 2187 } 2188 2189 static void usbg_detach(struct usbg_tpg *tpg) 2190 { 2191 struct usb_function_instance *f = tpg->fi; 2192 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2193 2194 if (opts->tcm_unregister_callback) 2195 opts->tcm_unregister_callback(f); 2196 } 2197 2198 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2199 { 2200 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2201 2202 pr_debug("tcm: Activating %s\n", name); 2203 2204 mutex_lock(&opts->dep_lock); 2205 opts->ready = true; 2206 mutex_unlock(&opts->dep_lock); 2207 2208 return 0; 2209 } 2210 2211 static struct usb_function_instance *tcm_alloc_inst(void) 2212 { 2213 struct f_tcm_opts *opts; 2214 int i; 2215 2216 2217 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2218 if (!opts) 2219 return ERR_PTR(-ENOMEM); 2220 2221 mutex_lock(&tpg_instances_lock); 2222 for (i = 0; i < TPG_INSTANCES; ++i) 2223 if (!tpg_instances[i].func_inst) 2224 break; 2225 2226 if (i == TPG_INSTANCES) { 2227 mutex_unlock(&tpg_instances_lock); 2228 kfree(opts); 2229 return ERR_PTR(-EBUSY); 2230 } 2231 tpg_instances[i].func_inst = &opts->func_inst; 2232 mutex_unlock(&tpg_instances_lock); 2233 2234 mutex_init(&opts->dep_lock); 2235 opts->func_inst.set_inst_name = tcm_set_name; 2236 opts->func_inst.free_func_inst = tcm_free_inst; 2237 opts->tcm_register_callback = tcm_register_callback; 2238 opts->tcm_unregister_callback = tcm_unregister_callback; 2239 2240 config_group_init_type_name(&opts->func_inst.group, "", 2241 &tcm_func_type); 2242 2243 return &opts->func_inst; 2244 } 2245 2246 static void tcm_free(struct usb_function *f) 2247 { 2248 struct f_uas *tcm = to_f_uas(f); 2249 2250 kfree(tcm); 2251 } 2252 2253 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2254 { 2255 usb_free_all_descriptors(f); 2256 } 2257 2258 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2259 { 2260 struct f_uas *fu; 2261 unsigned i; 2262 2263 mutex_lock(&tpg_instances_lock); 2264 for (i = 0; i < TPG_INSTANCES; ++i) 2265 if (tpg_instances[i].func_inst == fi) 2266 break; 2267 if (i == TPG_INSTANCES) { 2268 mutex_unlock(&tpg_instances_lock); 2269 return ERR_PTR(-ENODEV); 2270 } 2271 2272 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2273 if (!fu) { 2274 mutex_unlock(&tpg_instances_lock); 2275 return ERR_PTR(-ENOMEM); 2276 } 2277 2278 fu->function.name = "Target Function"; 2279 fu->function.bind = tcm_bind; 2280 fu->function.unbind = tcm_unbind; 2281 fu->function.set_alt = tcm_set_alt; 2282 fu->function.get_alt = tcm_get_alt; 2283 fu->function.setup = tcm_setup; 2284 fu->function.disable = tcm_disable; 2285 fu->function.free_func = tcm_free; 2286 fu->tpg = tpg_instances[i].tpg; 2287 mutex_unlock(&tpg_instances_lock); 2288 2289 return &fu->function; 2290 } 2291 2292 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2293 2294 static int __init tcm_init(void) 2295 { 2296 int ret; 2297 2298 ret = usb_function_register(&tcmusb_func); 2299 if (ret) 2300 return ret; 2301 2302 ret = target_register_template(&usbg_ops); 2303 if (ret) 2304 usb_function_unregister(&tcmusb_func); 2305 2306 return ret; 2307 } 2308 module_init(tcm_init); 2309 2310 static void __exit tcm_exit(void) 2311 { 2312 target_unregister_template(&usbg_ops); 2313 usb_function_unregister(&tcmusb_func); 2314 } 2315 module_exit(tcm_exit); 2316 2317 MODULE_DESCRIPTION("Target based USB-Gadget"); 2318 MODULE_LICENSE("GPL"); 2319 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2320