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.req, GFP_ATOMIC); 54 if (!ret) 55 fu->flags |= USBG_BOT_CMD_PEND; 56 return ret; 57 } 58 59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req) 60 { 61 struct usbg_cmd *cmd = req->context; 62 struct f_uas *fu = cmd->fu; 63 64 transport_generic_free_cmd(&cmd->se_cmd, 0); 65 if (req->status < 0) { 66 pr_err("ERR %s(%d)\n", __func__, __LINE__); 67 return; 68 } 69 70 /* CSW completed, wait for next CBW */ 71 bot_enqueue_cmd_cbw(fu); 72 } 73 74 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd) 75 { 76 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 77 int ret; 78 unsigned int csw_stat; 79 80 csw_stat = cmd->csw_code; 81 csw->Tag = cmd->bot_tag; 82 csw->Status = csw_stat; 83 fu->bot_status.req->context = cmd; 84 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC); 85 if (ret) 86 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 87 } 88 89 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req) 90 { 91 struct usbg_cmd *cmd = req->context; 92 struct f_uas *fu = cmd->fu; 93 94 if (req->status < 0) 95 pr_err("ERR %s(%d)\n", __func__, __LINE__); 96 97 if (cmd->data_len) { 98 if (cmd->data_len > ep->maxpacket) { 99 req->length = ep->maxpacket; 100 cmd->data_len -= ep->maxpacket; 101 } else { 102 req->length = cmd->data_len; 103 cmd->data_len = 0; 104 } 105 106 usb_ep_queue(ep, req, GFP_ATOMIC); 107 return; 108 } 109 bot_enqueue_sense_code(fu, cmd); 110 } 111 112 static void bot_send_bad_status(struct usbg_cmd *cmd) 113 { 114 struct f_uas *fu = cmd->fu; 115 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 116 struct usb_request *req; 117 struct usb_ep *ep; 118 119 csw->Residue = cpu_to_le32(cmd->data_len); 120 121 if (cmd->data_len) { 122 if (cmd->is_read) { 123 ep = fu->ep_in; 124 req = fu->bot_req_in; 125 } else { 126 ep = fu->ep_out; 127 req = fu->bot_req_out; 128 } 129 130 if (cmd->data_len > fu->ep_in->maxpacket) { 131 req->length = ep->maxpacket; 132 cmd->data_len -= ep->maxpacket; 133 } else { 134 req->length = cmd->data_len; 135 cmd->data_len = 0; 136 } 137 req->complete = bot_err_compl; 138 req->context = cmd; 139 req->buf = fu->cmd.buf; 140 usb_ep_queue(ep, req, GFP_KERNEL); 141 } else { 142 bot_enqueue_sense_code(fu, cmd); 143 } 144 } 145 146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data) 147 { 148 struct f_uas *fu = cmd->fu; 149 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 150 int ret; 151 152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) { 153 if (!moved_data && cmd->data_len) { 154 /* 155 * the host wants to move data, we don't. Fill / empty 156 * the pipe and then send the csw with reside set. 157 */ 158 cmd->csw_code = US_BULK_STAT_OK; 159 bot_send_bad_status(cmd); 160 return 0; 161 } 162 163 csw->Tag = cmd->bot_tag; 164 csw->Residue = cpu_to_le32(0); 165 csw->Status = US_BULK_STAT_OK; 166 fu->bot_status.req->context = cmd; 167 168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL); 169 if (ret) 170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 171 } else { 172 cmd->csw_code = US_BULK_STAT_FAIL; 173 bot_send_bad_status(cmd); 174 } 175 return 0; 176 } 177 178 /* 179 * Called after command (no data transfer) or after the write (to device) 180 * operation is completed 181 */ 182 static int bot_send_status_response(struct usbg_cmd *cmd) 183 { 184 bool moved_data = false; 185 186 if (!cmd->is_read) 187 moved_data = true; 188 return bot_send_status(cmd, moved_data); 189 } 190 191 /* Read request completed, now we have to send the CSW */ 192 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req) 193 { 194 struct usbg_cmd *cmd = req->context; 195 196 if (req->status < 0) 197 pr_err("ERR %s(%d)\n", __func__, __LINE__); 198 199 bot_send_status(cmd, true); 200 } 201 202 static int bot_send_read_response(struct usbg_cmd *cmd) 203 { 204 struct f_uas *fu = cmd->fu; 205 struct se_cmd *se_cmd = &cmd->se_cmd; 206 struct usb_gadget *gadget = fuas_to_gadget(fu); 207 int ret; 208 209 if (!cmd->data_len) { 210 cmd->csw_code = US_BULK_STAT_PHASE; 211 bot_send_bad_status(cmd); 212 return 0; 213 } 214 215 if (!gadget->sg_supported) { 216 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 217 if (!cmd->data_buf) 218 return -ENOMEM; 219 220 sg_copy_to_buffer(se_cmd->t_data_sg, 221 se_cmd->t_data_nents, 222 cmd->data_buf, 223 se_cmd->data_length); 224 225 fu->bot_req_in->buf = cmd->data_buf; 226 } else { 227 fu->bot_req_in->buf = NULL; 228 fu->bot_req_in->num_sgs = se_cmd->t_data_nents; 229 fu->bot_req_in->sg = se_cmd->t_data_sg; 230 } 231 232 fu->bot_req_in->complete = bot_read_compl; 233 fu->bot_req_in->length = se_cmd->data_length; 234 fu->bot_req_in->context = cmd; 235 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC); 236 if (ret) 237 pr_err("%s(%d)\n", __func__, __LINE__); 238 return 0; 239 } 240 241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); 242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); 243 244 static int bot_send_write_request(struct usbg_cmd *cmd) 245 { 246 struct f_uas *fu = cmd->fu; 247 struct se_cmd *se_cmd = &cmd->se_cmd; 248 struct usb_gadget *gadget = fuas_to_gadget(fu); 249 int ret; 250 251 init_completion(&cmd->write_complete); 252 cmd->fu = fu; 253 254 if (!cmd->data_len) { 255 cmd->csw_code = US_BULK_STAT_PHASE; 256 return -EINVAL; 257 } 258 259 if (!gadget->sg_supported) { 260 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL); 261 if (!cmd->data_buf) 262 return -ENOMEM; 263 264 fu->bot_req_out->buf = cmd->data_buf; 265 } else { 266 fu->bot_req_out->buf = NULL; 267 fu->bot_req_out->num_sgs = se_cmd->t_data_nents; 268 fu->bot_req_out->sg = se_cmd->t_data_sg; 269 } 270 271 fu->bot_req_out->complete = usbg_data_write_cmpl; 272 fu->bot_req_out->length = se_cmd->data_length; 273 fu->bot_req_out->context = cmd; 274 275 ret = usbg_prepare_w_request(cmd, fu->bot_req_out); 276 if (ret) 277 goto cleanup; 278 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); 279 if (ret) 280 pr_err("%s(%d)\n", __func__, __LINE__); 281 282 wait_for_completion(&cmd->write_complete); 283 target_execute_cmd(se_cmd); 284 cleanup: 285 return ret; 286 } 287 288 static int bot_submit_command(struct f_uas *, void *, unsigned int); 289 290 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) 291 { 292 struct f_uas *fu = req->context; 293 int ret; 294 295 fu->flags &= ~USBG_BOT_CMD_PEND; 296 297 if (req->status < 0) 298 return; 299 300 ret = bot_submit_command(fu, req->buf, req->actual); 301 if (ret) 302 pr_err("%s(%d): %d\n", __func__, __LINE__, ret); 303 } 304 305 static int bot_prepare_reqs(struct f_uas *fu) 306 { 307 int ret; 308 309 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 310 if (!fu->bot_req_in) 311 goto err; 312 313 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 314 if (!fu->bot_req_out) 315 goto err_out; 316 317 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 318 if (!fu->cmd.req) 319 goto err_cmd; 320 321 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 322 if (!fu->bot_status.req) 323 goto err_sts; 324 325 fu->bot_status.req->buf = &fu->bot_status.csw; 326 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; 327 fu->bot_status.req->complete = bot_status_complete; 328 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); 329 330 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); 331 if (!fu->cmd.buf) 332 goto err_buf; 333 334 fu->cmd.req->complete = bot_cmd_complete; 335 fu->cmd.req->buf = fu->cmd.buf; 336 fu->cmd.req->length = fu->ep_out->maxpacket; 337 fu->cmd.req->context = fu; 338 339 ret = bot_enqueue_cmd_cbw(fu); 340 if (ret) 341 goto err_queue; 342 return 0; 343 err_queue: 344 kfree(fu->cmd.buf); 345 fu->cmd.buf = NULL; 346 err_buf: 347 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 348 err_sts: 349 usb_ep_free_request(fu->ep_out, fu->cmd.req); 350 fu->cmd.req = NULL; 351 err_cmd: 352 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 353 fu->bot_req_out = NULL; 354 err_out: 355 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 356 fu->bot_req_in = NULL; 357 err: 358 pr_err("BOT: endpoint setup failed\n"); 359 return -ENOMEM; 360 } 361 362 static void bot_cleanup_old_alt(struct f_uas *fu) 363 { 364 if (!(fu->flags & USBG_ENABLED)) 365 return; 366 367 usb_ep_disable(fu->ep_in); 368 usb_ep_disable(fu->ep_out); 369 370 if (!fu->bot_req_in) 371 return; 372 373 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 374 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 375 usb_ep_free_request(fu->ep_out, fu->cmd.req); 376 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 377 378 kfree(fu->cmd.buf); 379 380 fu->bot_req_in = NULL; 381 fu->bot_req_out = NULL; 382 fu->cmd.req = NULL; 383 fu->bot_status.req = NULL; 384 fu->cmd.buf = NULL; 385 } 386 387 static void bot_set_alt(struct f_uas *fu) 388 { 389 struct usb_function *f = &fu->function; 390 struct usb_gadget *gadget = f->config->cdev->gadget; 391 int ret; 392 393 fu->flags = USBG_IS_BOT; 394 395 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB); 396 ret = usb_ep_enable(fu->ep_in); 397 if (ret) 398 goto err_b_in; 399 400 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB); 401 ret = usb_ep_enable(fu->ep_out); 402 if (ret) 403 goto err_b_out; 404 405 ret = bot_prepare_reqs(fu); 406 if (ret) 407 goto err_wq; 408 fu->flags |= USBG_ENABLED; 409 pr_info("Using the BOT protocol\n"); 410 return; 411 err_wq: 412 usb_ep_disable(fu->ep_out); 413 err_b_out: 414 usb_ep_disable(fu->ep_in); 415 err_b_in: 416 fu->flags = USBG_IS_BOT; 417 } 418 419 static int usbg_bot_setup(struct usb_function *f, 420 const struct usb_ctrlrequest *ctrl) 421 { 422 struct f_uas *fu = to_f_uas(f); 423 struct usb_composite_dev *cdev = f->config->cdev; 424 u16 w_value = le16_to_cpu(ctrl->wValue); 425 u16 w_length = le16_to_cpu(ctrl->wLength); 426 int luns; 427 u8 *ret_lun; 428 429 switch (ctrl->bRequest) { 430 case US_BULK_GET_MAX_LUN: 431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 432 USB_RECIP_INTERFACE)) 433 return -ENOTSUPP; 434 435 if (w_length < 1) 436 return -EINVAL; 437 if (w_value != 0) 438 return -EINVAL; 439 luns = atomic_read(&fu->tpg->tpg_port_count); 440 if (!luns) { 441 pr_err("No LUNs configured?\n"); 442 return -EINVAL; 443 } 444 luns--; 445 if (luns > US_BULK_MAX_LUN_LIMIT) { 446 pr_info_once("Limiting the number of luns to 16\n"); 447 luns = US_BULK_MAX_LUN_LIMIT; 448 } 449 ret_lun = cdev->req->buf; 450 *ret_lun = luns; 451 cdev->req->length = 1; 452 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); 453 454 case US_BULK_RESET_REQUEST: 455 /* XXX maybe we should remove previous requests for IN + OUT */ 456 bot_enqueue_cmd_cbw(fu); 457 return 0; 458 } 459 return -ENOTSUPP; 460 } 461 462 /* Start uas.c code */ 463 464 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) 465 { 466 /* We have either all three allocated or none */ 467 if (!stream->req_in) 468 return; 469 470 usb_ep_free_request(fu->ep_in, stream->req_in); 471 usb_ep_free_request(fu->ep_out, stream->req_out); 472 usb_ep_free_request(fu->ep_status, stream->req_status); 473 474 stream->req_in = NULL; 475 stream->req_out = NULL; 476 stream->req_status = NULL; 477 } 478 479 static void uasp_free_cmdreq(struct f_uas *fu) 480 { 481 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 482 kfree(fu->cmd.buf); 483 fu->cmd.req = NULL; 484 fu->cmd.buf = NULL; 485 } 486 487 static void uasp_cleanup_old_alt(struct f_uas *fu) 488 { 489 int i; 490 491 if (!(fu->flags & USBG_ENABLED)) 492 return; 493 494 usb_ep_disable(fu->ep_in); 495 usb_ep_disable(fu->ep_out); 496 usb_ep_disable(fu->ep_status); 497 usb_ep_disable(fu->ep_cmd); 498 499 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++) 500 uasp_cleanup_one_stream(fu, &fu->stream[i]); 501 uasp_free_cmdreq(fu); 502 } 503 504 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 505 506 static int uasp_prepare_r_request(struct usbg_cmd *cmd) 507 { 508 struct se_cmd *se_cmd = &cmd->se_cmd; 509 struct f_uas *fu = cmd->fu; 510 struct usb_gadget *gadget = fuas_to_gadget(fu); 511 struct uas_stream *stream = cmd->stream; 512 513 if (!gadget->sg_supported) { 514 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 515 if (!cmd->data_buf) 516 return -ENOMEM; 517 518 sg_copy_to_buffer(se_cmd->t_data_sg, 519 se_cmd->t_data_nents, 520 cmd->data_buf, 521 se_cmd->data_length); 522 523 stream->req_in->buf = cmd->data_buf; 524 } else { 525 stream->req_in->buf = NULL; 526 stream->req_in->num_sgs = se_cmd->t_data_nents; 527 stream->req_in->sg = se_cmd->t_data_sg; 528 } 529 530 stream->req_in->is_last = 1; 531 stream->req_in->complete = uasp_status_data_cmpl; 532 stream->req_in->length = se_cmd->data_length; 533 stream->req_in->context = cmd; 534 535 cmd->state = UASP_SEND_STATUS; 536 return 0; 537 } 538 539 static void uasp_prepare_status(struct usbg_cmd *cmd) 540 { 541 struct se_cmd *se_cmd = &cmd->se_cmd; 542 struct sense_iu *iu = &cmd->sense_iu; 543 struct uas_stream *stream = cmd->stream; 544 545 cmd->state = UASP_QUEUE_COMMAND; 546 iu->iu_id = IU_ID_STATUS; 547 iu->tag = cpu_to_be16(cmd->tag); 548 549 /* 550 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 551 */ 552 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 553 iu->status = se_cmd->scsi_status; 554 stream->req_status->is_last = 1; 555 stream->req_status->context = cmd; 556 stream->req_status->length = se_cmd->scsi_sense_length + 16; 557 stream->req_status->buf = iu; 558 stream->req_status->complete = uasp_status_data_cmpl; 559 } 560 561 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 562 { 563 struct usbg_cmd *cmd = req->context; 564 struct uas_stream *stream = cmd->stream; 565 struct f_uas *fu = cmd->fu; 566 int ret; 567 568 if (req->status < 0) 569 goto cleanup; 570 571 switch (cmd->state) { 572 case UASP_SEND_DATA: 573 ret = uasp_prepare_r_request(cmd); 574 if (ret) 575 goto cleanup; 576 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 577 if (ret) 578 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 579 break; 580 581 case UASP_RECEIVE_DATA: 582 ret = usbg_prepare_w_request(cmd, stream->req_out); 583 if (ret) 584 goto cleanup; 585 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 586 if (ret) 587 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 588 break; 589 590 case UASP_SEND_STATUS: 591 uasp_prepare_status(cmd); 592 ret = usb_ep_queue(fu->ep_status, stream->req_status, 593 GFP_ATOMIC); 594 if (ret) 595 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 596 break; 597 598 case UASP_QUEUE_COMMAND: 599 transport_generic_free_cmd(&cmd->se_cmd, 0); 600 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 601 break; 602 603 default: 604 BUG(); 605 } 606 return; 607 608 cleanup: 609 transport_generic_free_cmd(&cmd->se_cmd, 0); 610 } 611 612 static int uasp_send_status_response(struct usbg_cmd *cmd) 613 { 614 struct f_uas *fu = cmd->fu; 615 struct uas_stream *stream = cmd->stream; 616 struct sense_iu *iu = &cmd->sense_iu; 617 618 iu->tag = cpu_to_be16(cmd->tag); 619 stream->req_status->complete = uasp_status_data_cmpl; 620 stream->req_status->context = cmd; 621 cmd->fu = fu; 622 uasp_prepare_status(cmd); 623 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 624 } 625 626 static int uasp_send_read_response(struct usbg_cmd *cmd) 627 { 628 struct f_uas *fu = cmd->fu; 629 struct uas_stream *stream = cmd->stream; 630 struct sense_iu *iu = &cmd->sense_iu; 631 int ret; 632 633 cmd->fu = fu; 634 635 iu->tag = cpu_to_be16(cmd->tag); 636 if (fu->flags & USBG_USE_STREAMS) { 637 638 ret = uasp_prepare_r_request(cmd); 639 if (ret) 640 goto out; 641 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 642 if (ret) { 643 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 644 kfree(cmd->data_buf); 645 cmd->data_buf = NULL; 646 } 647 648 } else { 649 650 iu->iu_id = IU_ID_READ_READY; 651 iu->tag = cpu_to_be16(cmd->tag); 652 653 stream->req_status->complete = uasp_status_data_cmpl; 654 stream->req_status->context = cmd; 655 656 cmd->state = UASP_SEND_DATA; 657 stream->req_status->buf = iu; 658 stream->req_status->length = sizeof(struct iu); 659 660 ret = usb_ep_queue(fu->ep_status, stream->req_status, 661 GFP_ATOMIC); 662 if (ret) 663 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 664 } 665 out: 666 return ret; 667 } 668 669 static int uasp_send_write_request(struct usbg_cmd *cmd) 670 { 671 struct f_uas *fu = cmd->fu; 672 struct se_cmd *se_cmd = &cmd->se_cmd; 673 struct uas_stream *stream = cmd->stream; 674 struct sense_iu *iu = &cmd->sense_iu; 675 int ret; 676 677 init_completion(&cmd->write_complete); 678 cmd->fu = fu; 679 680 iu->tag = cpu_to_be16(cmd->tag); 681 682 if (fu->flags & USBG_USE_STREAMS) { 683 684 ret = usbg_prepare_w_request(cmd, stream->req_out); 685 if (ret) 686 goto cleanup; 687 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 688 if (ret) 689 pr_err("%s(%d)\n", __func__, __LINE__); 690 691 } else { 692 693 iu->iu_id = IU_ID_WRITE_READY; 694 iu->tag = cpu_to_be16(cmd->tag); 695 696 stream->req_status->complete = uasp_status_data_cmpl; 697 stream->req_status->context = cmd; 698 699 cmd->state = UASP_RECEIVE_DATA; 700 stream->req_status->buf = iu; 701 stream->req_status->length = sizeof(struct iu); 702 703 ret = usb_ep_queue(fu->ep_status, stream->req_status, 704 GFP_ATOMIC); 705 if (ret) 706 pr_err("%s(%d)\n", __func__, __LINE__); 707 } 708 709 wait_for_completion(&cmd->write_complete); 710 target_execute_cmd(se_cmd); 711 cleanup: 712 return ret; 713 } 714 715 static int usbg_submit_command(struct f_uas *, void *, unsigned int); 716 717 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 718 { 719 struct f_uas *fu = req->context; 720 int ret; 721 722 if (req->status < 0) 723 return; 724 725 ret = usbg_submit_command(fu, req->buf, req->actual); 726 /* 727 * Once we tune for performance enqueue the command req here again so 728 * we can receive a second command while we processing this one. Pay 729 * attention to properly sync STAUS endpoint with DATA IN + OUT so you 730 * don't break HS. 731 */ 732 if (!ret) 733 return; 734 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 735 } 736 737 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 738 { 739 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 740 if (!stream->req_in) 741 goto out; 742 743 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 744 if (!stream->req_out) 745 goto err_out; 746 747 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 748 if (!stream->req_status) 749 goto err_sts; 750 751 return 0; 752 753 err_sts: 754 usb_ep_free_request(fu->ep_out, stream->req_out); 755 stream->req_out = NULL; 756 err_out: 757 usb_ep_free_request(fu->ep_in, stream->req_in); 758 stream->req_in = NULL; 759 out: 760 return -ENOMEM; 761 } 762 763 static int uasp_alloc_cmd(struct f_uas *fu) 764 { 765 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 766 if (!fu->cmd.req) 767 goto err; 768 769 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 770 if (!fu->cmd.buf) 771 goto err_buf; 772 773 fu->cmd.req->complete = uasp_cmd_complete; 774 fu->cmd.req->buf = fu->cmd.buf; 775 fu->cmd.req->length = fu->ep_cmd->maxpacket; 776 fu->cmd.req->context = fu; 777 return 0; 778 779 err_buf: 780 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 781 err: 782 return -ENOMEM; 783 } 784 785 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams) 786 { 787 int i; 788 789 for (i = 0; i < max_streams; i++) { 790 struct uas_stream *s = &fu->stream[i]; 791 792 s->req_in->stream_id = i + 1; 793 s->req_out->stream_id = i + 1; 794 s->req_status->stream_id = i + 1; 795 } 796 } 797 798 static int uasp_prepare_reqs(struct f_uas *fu) 799 { 800 int ret; 801 int i; 802 int max_streams; 803 804 if (fu->flags & USBG_USE_STREAMS) 805 max_streams = UASP_SS_EP_COMP_NUM_STREAMS; 806 else 807 max_streams = 1; 808 809 for (i = 0; i < max_streams; i++) { 810 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 811 if (ret) 812 goto err_cleanup; 813 } 814 815 ret = uasp_alloc_cmd(fu); 816 if (ret) 817 goto err_free_stream; 818 uasp_setup_stream_res(fu, max_streams); 819 820 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 821 if (ret) 822 goto err_free_stream; 823 824 return 0; 825 826 err_free_stream: 827 uasp_free_cmdreq(fu); 828 829 err_cleanup: 830 if (i) { 831 do { 832 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 833 i--; 834 } while (i); 835 } 836 pr_err("UASP: endpoint setup failed\n"); 837 return ret; 838 } 839 840 static void uasp_set_alt(struct f_uas *fu) 841 { 842 struct usb_function *f = &fu->function; 843 struct usb_gadget *gadget = f->config->cdev->gadget; 844 int ret; 845 846 fu->flags = USBG_IS_UAS; 847 848 if (gadget->speed >= USB_SPEED_SUPER) 849 fu->flags |= USBG_USE_STREAMS; 850 851 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS); 852 ret = usb_ep_enable(fu->ep_in); 853 if (ret) 854 goto err_b_in; 855 856 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS); 857 ret = usb_ep_enable(fu->ep_out); 858 if (ret) 859 goto err_b_out; 860 861 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS); 862 ret = usb_ep_enable(fu->ep_cmd); 863 if (ret) 864 goto err_cmd; 865 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS); 866 ret = usb_ep_enable(fu->ep_status); 867 if (ret) 868 goto err_status; 869 870 ret = uasp_prepare_reqs(fu); 871 if (ret) 872 goto err_wq; 873 fu->flags |= USBG_ENABLED; 874 875 pr_info("Using the UAS protocol\n"); 876 return; 877 err_wq: 878 usb_ep_disable(fu->ep_status); 879 err_status: 880 usb_ep_disable(fu->ep_cmd); 881 err_cmd: 882 usb_ep_disable(fu->ep_out); 883 err_b_out: 884 usb_ep_disable(fu->ep_in); 885 err_b_in: 886 fu->flags = 0; 887 } 888 889 static int get_cmd_dir(const unsigned char *cdb) 890 { 891 int ret; 892 893 switch (cdb[0]) { 894 case READ_6: 895 case READ_10: 896 case READ_12: 897 case READ_16: 898 case INQUIRY: 899 case MODE_SENSE: 900 case MODE_SENSE_10: 901 case SERVICE_ACTION_IN_16: 902 case MAINTENANCE_IN: 903 case PERSISTENT_RESERVE_IN: 904 case SECURITY_PROTOCOL_IN: 905 case ACCESS_CONTROL_IN: 906 case REPORT_LUNS: 907 case READ_BLOCK_LIMITS: 908 case READ_POSITION: 909 case READ_CAPACITY: 910 case READ_TOC: 911 case READ_FORMAT_CAPACITIES: 912 case REQUEST_SENSE: 913 ret = DMA_FROM_DEVICE; 914 break; 915 916 case WRITE_6: 917 case WRITE_10: 918 case WRITE_12: 919 case WRITE_16: 920 case MODE_SELECT: 921 case MODE_SELECT_10: 922 case WRITE_VERIFY: 923 case WRITE_VERIFY_12: 924 case PERSISTENT_RESERVE_OUT: 925 case MAINTENANCE_OUT: 926 case SECURITY_PROTOCOL_OUT: 927 case ACCESS_CONTROL_OUT: 928 ret = DMA_TO_DEVICE; 929 break; 930 case ALLOW_MEDIUM_REMOVAL: 931 case TEST_UNIT_READY: 932 case SYNCHRONIZE_CACHE: 933 case START_STOP: 934 case ERASE: 935 case REZERO_UNIT: 936 case SEEK_10: 937 case SPACE: 938 case VERIFY: 939 case WRITE_FILEMARKS: 940 ret = DMA_NONE; 941 break; 942 default: 943 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 944 pr_warn(CMD_DIR_MSG, cdb[0]); 945 #undef CMD_DIR_MSG 946 ret = -EINVAL; 947 } 948 return ret; 949 } 950 951 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 952 { 953 struct usbg_cmd *cmd = req->context; 954 struct se_cmd *se_cmd = &cmd->se_cmd; 955 956 if (req->status < 0) { 957 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 958 goto cleanup; 959 } 960 961 if (req->num_sgs == 0) { 962 sg_copy_from_buffer(se_cmd->t_data_sg, 963 se_cmd->t_data_nents, 964 cmd->data_buf, 965 se_cmd->data_length); 966 } 967 968 complete(&cmd->write_complete); 969 return; 970 971 cleanup: 972 target_put_sess_cmd(se_cmd); 973 transport_generic_free_cmd(&cmd->se_cmd, 0); 974 } 975 976 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 977 { 978 struct se_cmd *se_cmd = &cmd->se_cmd; 979 struct f_uas *fu = cmd->fu; 980 struct usb_gadget *gadget = fuas_to_gadget(fu); 981 982 if (!gadget->sg_supported) { 983 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 984 if (!cmd->data_buf) 985 return -ENOMEM; 986 987 req->buf = cmd->data_buf; 988 } else { 989 req->buf = NULL; 990 req->num_sgs = se_cmd->t_data_nents; 991 req->sg = se_cmd->t_data_sg; 992 } 993 994 req->is_last = 1; 995 req->complete = usbg_data_write_cmpl; 996 req->length = se_cmd->data_length; 997 req->context = cmd; 998 return 0; 999 } 1000 1001 static int usbg_send_status_response(struct se_cmd *se_cmd) 1002 { 1003 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1004 se_cmd); 1005 struct f_uas *fu = cmd->fu; 1006 1007 if (fu->flags & USBG_IS_BOT) 1008 return bot_send_status_response(cmd); 1009 else 1010 return uasp_send_status_response(cmd); 1011 } 1012 1013 static int usbg_send_write_request(struct se_cmd *se_cmd) 1014 { 1015 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1016 se_cmd); 1017 struct f_uas *fu = cmd->fu; 1018 1019 if (fu->flags & USBG_IS_BOT) 1020 return bot_send_write_request(cmd); 1021 else 1022 return uasp_send_write_request(cmd); 1023 } 1024 1025 static int usbg_send_read_response(struct se_cmd *se_cmd) 1026 { 1027 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1028 se_cmd); 1029 struct f_uas *fu = cmd->fu; 1030 1031 if (fu->flags & USBG_IS_BOT) 1032 return bot_send_read_response(cmd); 1033 else 1034 return uasp_send_read_response(cmd); 1035 } 1036 1037 static void usbg_cmd_work(struct work_struct *work) 1038 { 1039 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1040 struct se_cmd *se_cmd; 1041 struct tcm_usbg_nexus *tv_nexus; 1042 struct usbg_tpg *tpg; 1043 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1044 1045 se_cmd = &cmd->se_cmd; 1046 tpg = cmd->fu->tpg; 1047 tv_nexus = tpg->tpg_nexus; 1048 dir = get_cmd_dir(cmd->cmd_buf); 1049 if (dir < 0) { 1050 __target_init_cmd(se_cmd, 1051 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1052 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1053 cmd->prio_attr, cmd->sense_iu.sense, 1054 cmd->unpacked_lun, NULL); 1055 goto out; 1056 } 1057 1058 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1059 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1060 cmd->prio_attr, dir, flags); 1061 return; 1062 1063 out: 1064 transport_send_check_condition_and_sense(se_cmd, 1065 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1066 } 1067 1068 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1069 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1070 { 1071 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1072 struct usbg_cmd *cmd; 1073 int tag, cpu; 1074 1075 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1076 if (tag < 0) 1077 return ERR_PTR(-ENOMEM); 1078 1079 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1080 memset(cmd, 0, sizeof(*cmd)); 1081 cmd->se_cmd.map_tag = tag; 1082 cmd->se_cmd.map_cpu = cpu; 1083 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1084 cmd->fu = fu; 1085 1086 return cmd; 1087 } 1088 1089 static void usbg_release_cmd(struct se_cmd *); 1090 1091 static int usbg_submit_command(struct f_uas *fu, 1092 void *cmdbuf, unsigned int len) 1093 { 1094 struct command_iu *cmd_iu = cmdbuf; 1095 struct usbg_cmd *cmd; 1096 struct usbg_tpg *tpg = fu->tpg; 1097 struct tcm_usbg_nexus *tv_nexus; 1098 u32 cmd_len; 1099 u16 scsi_tag; 1100 1101 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1102 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1103 return -EINVAL; 1104 } 1105 1106 tv_nexus = tpg->tpg_nexus; 1107 if (!tv_nexus) { 1108 pr_err("Missing nexus, ignoring command\n"); 1109 return -EINVAL; 1110 } 1111 1112 cmd_len = (cmd_iu->len & ~0x3) + 16; 1113 if (cmd_len > USBG_MAX_CMD) 1114 return -EINVAL; 1115 1116 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1117 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1118 if (IS_ERR(cmd)) { 1119 pr_err("usbg_get_cmd failed\n"); 1120 return -ENOMEM; 1121 } 1122 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1123 1124 if (fu->flags & USBG_USE_STREAMS) { 1125 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) 1126 goto err; 1127 if (!cmd->tag) 1128 cmd->stream = &fu->stream[0]; 1129 else 1130 cmd->stream = &fu->stream[cmd->tag - 1]; 1131 } else { 1132 cmd->stream = &fu->stream[0]; 1133 } 1134 1135 switch (cmd_iu->prio_attr & 0x7) { 1136 case UAS_HEAD_TAG: 1137 cmd->prio_attr = TCM_HEAD_TAG; 1138 break; 1139 case UAS_ORDERED_TAG: 1140 cmd->prio_attr = TCM_ORDERED_TAG; 1141 break; 1142 case UAS_ACA: 1143 cmd->prio_attr = TCM_ACA_TAG; 1144 break; 1145 default: 1146 pr_debug_once("Unsupported prio_attr: %02x.\n", 1147 cmd_iu->prio_attr); 1148 fallthrough; 1149 case UAS_SIMPLE_TAG: 1150 cmd->prio_attr = TCM_SIMPLE_TAG; 1151 break; 1152 } 1153 1154 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1155 1156 INIT_WORK(&cmd->work, usbg_cmd_work); 1157 queue_work(tpg->workqueue, &cmd->work); 1158 1159 return 0; 1160 err: 1161 usbg_release_cmd(&cmd->se_cmd); 1162 return -EINVAL; 1163 } 1164 1165 static void bot_cmd_work(struct work_struct *work) 1166 { 1167 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1168 struct se_cmd *se_cmd; 1169 struct tcm_usbg_nexus *tv_nexus; 1170 struct usbg_tpg *tpg; 1171 int dir; 1172 1173 se_cmd = &cmd->se_cmd; 1174 tpg = cmd->fu->tpg; 1175 tv_nexus = tpg->tpg_nexus; 1176 dir = get_cmd_dir(cmd->cmd_buf); 1177 if (dir < 0) { 1178 __target_init_cmd(se_cmd, 1179 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1180 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1181 cmd->prio_attr, cmd->sense_iu.sense, 1182 cmd->unpacked_lun, NULL); 1183 goto out; 1184 } 1185 1186 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1187 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1188 cmd->data_len, cmd->prio_attr, dir, 0); 1189 return; 1190 1191 out: 1192 transport_send_check_condition_and_sense(se_cmd, 1193 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1194 } 1195 1196 static int bot_submit_command(struct f_uas *fu, 1197 void *cmdbuf, unsigned int len) 1198 { 1199 struct bulk_cb_wrap *cbw = cmdbuf; 1200 struct usbg_cmd *cmd; 1201 struct usbg_tpg *tpg = fu->tpg; 1202 struct tcm_usbg_nexus *tv_nexus; 1203 u32 cmd_len; 1204 1205 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1206 pr_err("Wrong signature on CBW\n"); 1207 return -EINVAL; 1208 } 1209 if (len != 31) { 1210 pr_err("Wrong length for CBW\n"); 1211 return -EINVAL; 1212 } 1213 1214 cmd_len = cbw->Length; 1215 if (cmd_len < 1 || cmd_len > 16) 1216 return -EINVAL; 1217 1218 tv_nexus = tpg->tpg_nexus; 1219 if (!tv_nexus) { 1220 pr_err("Missing nexus, ignoring command\n"); 1221 return -ENODEV; 1222 } 1223 1224 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1225 if (IS_ERR(cmd)) { 1226 pr_err("usbg_get_cmd failed\n"); 1227 return -ENOMEM; 1228 } 1229 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1230 1231 cmd->bot_tag = cbw->Tag; 1232 cmd->prio_attr = TCM_SIMPLE_TAG; 1233 cmd->unpacked_lun = cbw->Lun; 1234 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1235 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1236 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1237 1238 INIT_WORK(&cmd->work, bot_cmd_work); 1239 queue_work(tpg->workqueue, &cmd->work); 1240 1241 return 0; 1242 } 1243 1244 /* Start fabric.c code */ 1245 1246 static int usbg_check_true(struct se_portal_group *se_tpg) 1247 { 1248 return 1; 1249 } 1250 1251 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1252 { 1253 struct usbg_tpg *tpg = container_of(se_tpg, 1254 struct usbg_tpg, se_tpg); 1255 struct usbg_tport *tport = tpg->tport; 1256 1257 return &tport->tport_name[0]; 1258 } 1259 1260 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1261 { 1262 struct usbg_tpg *tpg = container_of(se_tpg, 1263 struct usbg_tpg, se_tpg); 1264 return tpg->tport_tpgt; 1265 } 1266 1267 static void usbg_release_cmd(struct se_cmd *se_cmd) 1268 { 1269 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1270 se_cmd); 1271 struct se_session *se_sess = se_cmd->se_sess; 1272 1273 kfree(cmd->data_buf); 1274 target_free_tag(se_sess, se_cmd); 1275 } 1276 1277 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1278 { 1279 } 1280 1281 static void usbg_aborted_task(struct se_cmd *se_cmd) 1282 { 1283 } 1284 1285 static const char *usbg_check_wwn(const char *name) 1286 { 1287 const char *n; 1288 unsigned int len; 1289 1290 n = strstr(name, "naa."); 1291 if (!n) 1292 return NULL; 1293 n += 4; 1294 len = strlen(n); 1295 if (len == 0 || len > USBG_NAMELEN - 1) 1296 return NULL; 1297 return n; 1298 } 1299 1300 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1301 { 1302 if (!usbg_check_wwn(name)) 1303 return -EINVAL; 1304 return 0; 1305 } 1306 1307 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1308 const char *name) 1309 { 1310 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1311 tport_wwn); 1312 struct usbg_tpg *tpg; 1313 unsigned long tpgt; 1314 int ret; 1315 struct f_tcm_opts *opts; 1316 unsigned i; 1317 1318 if (strstr(name, "tpgt_") != name) 1319 return ERR_PTR(-EINVAL); 1320 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1321 return ERR_PTR(-EINVAL); 1322 ret = -ENODEV; 1323 mutex_lock(&tpg_instances_lock); 1324 for (i = 0; i < TPG_INSTANCES; ++i) 1325 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1326 break; 1327 if (i == TPG_INSTANCES) 1328 goto unlock_inst; 1329 1330 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1331 func_inst); 1332 mutex_lock(&opts->dep_lock); 1333 if (!opts->ready) 1334 goto unlock_dep; 1335 1336 if (opts->has_dep) { 1337 if (!try_module_get(opts->dependent)) 1338 goto unlock_dep; 1339 } else { 1340 ret = configfs_depend_item_unlocked( 1341 wwn->wwn_group.cg_subsys, 1342 &opts->func_inst.group.cg_item); 1343 if (ret) 1344 goto unlock_dep; 1345 } 1346 1347 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1348 ret = -ENOMEM; 1349 if (!tpg) 1350 goto unref_dep; 1351 mutex_init(&tpg->tpg_mutex); 1352 atomic_set(&tpg->tpg_port_count, 0); 1353 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1354 if (!tpg->workqueue) 1355 goto free_tpg; 1356 1357 tpg->tport = tport; 1358 tpg->tport_tpgt = tpgt; 1359 1360 /* 1361 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1362 * pretend to be SAS.. 1363 */ 1364 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1365 if (ret < 0) 1366 goto free_workqueue; 1367 1368 tpg_instances[i].tpg = tpg; 1369 tpg->fi = tpg_instances[i].func_inst; 1370 mutex_unlock(&opts->dep_lock); 1371 mutex_unlock(&tpg_instances_lock); 1372 return &tpg->se_tpg; 1373 1374 free_workqueue: 1375 destroy_workqueue(tpg->workqueue); 1376 free_tpg: 1377 kfree(tpg); 1378 unref_dep: 1379 if (opts->has_dep) 1380 module_put(opts->dependent); 1381 else 1382 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1383 unlock_dep: 1384 mutex_unlock(&opts->dep_lock); 1385 unlock_inst: 1386 mutex_unlock(&tpg_instances_lock); 1387 1388 return ERR_PTR(ret); 1389 } 1390 1391 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1392 1393 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1394 { 1395 struct usbg_tpg *tpg = container_of(se_tpg, 1396 struct usbg_tpg, se_tpg); 1397 unsigned i; 1398 struct f_tcm_opts *opts; 1399 1400 tcm_usbg_drop_nexus(tpg); 1401 core_tpg_deregister(se_tpg); 1402 destroy_workqueue(tpg->workqueue); 1403 1404 mutex_lock(&tpg_instances_lock); 1405 for (i = 0; i < TPG_INSTANCES; ++i) 1406 if (tpg_instances[i].tpg == tpg) 1407 break; 1408 if (i < TPG_INSTANCES) { 1409 tpg_instances[i].tpg = NULL; 1410 opts = container_of(tpg_instances[i].func_inst, 1411 struct f_tcm_opts, func_inst); 1412 mutex_lock(&opts->dep_lock); 1413 if (opts->has_dep) 1414 module_put(opts->dependent); 1415 else 1416 configfs_undepend_item_unlocked( 1417 &opts->func_inst.group.cg_item); 1418 mutex_unlock(&opts->dep_lock); 1419 } 1420 mutex_unlock(&tpg_instances_lock); 1421 1422 kfree(tpg); 1423 } 1424 1425 static struct se_wwn *usbg_make_tport( 1426 struct target_fabric_configfs *tf, 1427 struct config_group *group, 1428 const char *name) 1429 { 1430 struct usbg_tport *tport; 1431 const char *wnn_name; 1432 u64 wwpn = 0; 1433 1434 wnn_name = usbg_check_wwn(name); 1435 if (!wnn_name) 1436 return ERR_PTR(-EINVAL); 1437 1438 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1439 if (!(tport)) 1440 return ERR_PTR(-ENOMEM); 1441 1442 tport->tport_wwpn = wwpn; 1443 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1444 return &tport->tport_wwn; 1445 } 1446 1447 static void usbg_drop_tport(struct se_wwn *wwn) 1448 { 1449 struct usbg_tport *tport = container_of(wwn, 1450 struct usbg_tport, tport_wwn); 1451 kfree(tport); 1452 } 1453 1454 /* 1455 * If somebody feels like dropping the version property, go ahead. 1456 */ 1457 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1458 { 1459 return sprintf(page, "usb-gadget fabric module\n"); 1460 } 1461 1462 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1463 1464 static struct configfs_attribute *usbg_wwn_attrs[] = { 1465 &usbg_wwn_attr_version, 1466 NULL, 1467 }; 1468 1469 static int usbg_attach(struct usbg_tpg *); 1470 static void usbg_detach(struct usbg_tpg *); 1471 1472 static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable) 1473 { 1474 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1475 int ret = 0; 1476 1477 if (enable) 1478 ret = usbg_attach(tpg); 1479 else 1480 usbg_detach(tpg); 1481 if (ret) 1482 return ret; 1483 1484 tpg->gadget_connect = enable; 1485 1486 return 0; 1487 } 1488 1489 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1490 { 1491 struct se_portal_group *se_tpg = to_tpg(item); 1492 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1493 struct tcm_usbg_nexus *tv_nexus; 1494 ssize_t ret; 1495 1496 mutex_lock(&tpg->tpg_mutex); 1497 tv_nexus = tpg->tpg_nexus; 1498 if (!tv_nexus) { 1499 ret = -ENODEV; 1500 goto out; 1501 } 1502 ret = sysfs_emit(page, "%s\n", 1503 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1504 out: 1505 mutex_unlock(&tpg->tpg_mutex); 1506 return ret; 1507 } 1508 1509 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1510 struct se_session *se_sess, void *p) 1511 { 1512 struct usbg_tpg *tpg = container_of(se_tpg, 1513 struct usbg_tpg, se_tpg); 1514 1515 tpg->tpg_nexus = p; 1516 return 0; 1517 } 1518 1519 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1520 { 1521 struct tcm_usbg_nexus *tv_nexus; 1522 int ret = 0; 1523 1524 mutex_lock(&tpg->tpg_mutex); 1525 if (tpg->tpg_nexus) { 1526 ret = -EEXIST; 1527 pr_debug("tpg->tpg_nexus already exists\n"); 1528 goto out_unlock; 1529 } 1530 1531 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1532 if (!tv_nexus) { 1533 ret = -ENOMEM; 1534 goto out_unlock; 1535 } 1536 1537 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1538 USB_G_DEFAULT_SESSION_TAGS, 1539 sizeof(struct usbg_cmd), 1540 TARGET_PROT_NORMAL, name, 1541 tv_nexus, usbg_alloc_sess_cb); 1542 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1543 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1544 pr_debug(MAKE_NEXUS_MSG, name); 1545 #undef MAKE_NEXUS_MSG 1546 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1547 kfree(tv_nexus); 1548 } 1549 1550 out_unlock: 1551 mutex_unlock(&tpg->tpg_mutex); 1552 return ret; 1553 } 1554 1555 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1556 { 1557 struct se_session *se_sess; 1558 struct tcm_usbg_nexus *tv_nexus; 1559 int ret = -ENODEV; 1560 1561 mutex_lock(&tpg->tpg_mutex); 1562 tv_nexus = tpg->tpg_nexus; 1563 if (!tv_nexus) 1564 goto out; 1565 1566 se_sess = tv_nexus->tvn_se_sess; 1567 if (!se_sess) 1568 goto out; 1569 1570 if (atomic_read(&tpg->tpg_port_count)) { 1571 ret = -EPERM; 1572 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1573 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1574 #undef MSG 1575 goto out; 1576 } 1577 1578 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1579 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1580 /* 1581 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1582 */ 1583 target_remove_session(se_sess); 1584 tpg->tpg_nexus = NULL; 1585 1586 kfree(tv_nexus); 1587 ret = 0; 1588 out: 1589 mutex_unlock(&tpg->tpg_mutex); 1590 return ret; 1591 } 1592 1593 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1594 const char *page, size_t count) 1595 { 1596 struct se_portal_group *se_tpg = to_tpg(item); 1597 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1598 unsigned char i_port[USBG_NAMELEN], *ptr; 1599 int ret; 1600 1601 if (!strncmp(page, "NULL", 4)) { 1602 ret = tcm_usbg_drop_nexus(tpg); 1603 return (!ret) ? count : ret; 1604 } 1605 if (strlen(page) >= USBG_NAMELEN) { 1606 1607 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1608 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1609 #undef NEXUS_STORE_MSG 1610 return -EINVAL; 1611 } 1612 snprintf(i_port, USBG_NAMELEN, "%s", page); 1613 1614 ptr = strstr(i_port, "naa."); 1615 if (!ptr) { 1616 pr_err("Missing 'naa.' prefix\n"); 1617 return -EINVAL; 1618 } 1619 1620 if (i_port[strlen(i_port) - 1] == '\n') 1621 i_port[strlen(i_port) - 1] = '\0'; 1622 1623 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1624 if (ret < 0) 1625 return ret; 1626 return count; 1627 } 1628 1629 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1630 1631 static struct configfs_attribute *usbg_base_attrs[] = { 1632 &tcm_usbg_tpg_attr_nexus, 1633 NULL, 1634 }; 1635 1636 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1637 { 1638 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1639 1640 atomic_inc(&tpg->tpg_port_count); 1641 smp_mb__after_atomic(); 1642 return 0; 1643 } 1644 1645 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1646 struct se_lun *se_lun) 1647 { 1648 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1649 1650 atomic_dec(&tpg->tpg_port_count); 1651 smp_mb__after_atomic(); 1652 } 1653 1654 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1655 { 1656 return target_put_sess_cmd(se_cmd); 1657 } 1658 1659 static const struct target_core_fabric_ops usbg_ops = { 1660 .module = THIS_MODULE, 1661 .fabric_name = "usb_gadget", 1662 .tpg_get_wwn = usbg_get_fabric_wwn, 1663 .tpg_get_tag = usbg_get_tag, 1664 .tpg_check_demo_mode = usbg_check_true, 1665 .release_cmd = usbg_release_cmd, 1666 .sess_get_initiator_sid = NULL, 1667 .write_pending = usbg_send_write_request, 1668 .queue_data_in = usbg_send_read_response, 1669 .queue_status = usbg_send_status_response, 1670 .queue_tm_rsp = usbg_queue_tm_rsp, 1671 .aborted_task = usbg_aborted_task, 1672 .check_stop_free = usbg_check_stop_free, 1673 1674 .fabric_make_wwn = usbg_make_tport, 1675 .fabric_drop_wwn = usbg_drop_tport, 1676 .fabric_make_tpg = usbg_make_tpg, 1677 .fabric_enable_tpg = usbg_enable_tpg, 1678 .fabric_drop_tpg = usbg_drop_tpg, 1679 .fabric_post_link = usbg_port_link, 1680 .fabric_pre_unlink = usbg_port_unlink, 1681 .fabric_init_nodeacl = usbg_init_nodeacl, 1682 1683 .tfc_wwn_attrs = usbg_wwn_attrs, 1684 .tfc_tpg_base_attrs = usbg_base_attrs, 1685 1686 .default_submit_type = TARGET_DIRECT_SUBMIT, 1687 .direct_submit_supp = 1, 1688 }; 1689 1690 /* Start gadget.c code */ 1691 1692 static struct usb_interface_descriptor bot_intf_desc = { 1693 .bLength = sizeof(bot_intf_desc), 1694 .bDescriptorType = USB_DT_INTERFACE, 1695 .bNumEndpoints = 2, 1696 .bAlternateSetting = USB_G_ALT_INT_BBB, 1697 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1698 .bInterfaceSubClass = USB_SC_SCSI, 1699 .bInterfaceProtocol = USB_PR_BULK, 1700 }; 1701 1702 static struct usb_interface_descriptor uasp_intf_desc = { 1703 .bLength = sizeof(uasp_intf_desc), 1704 .bDescriptorType = USB_DT_INTERFACE, 1705 .bNumEndpoints = 4, 1706 .bAlternateSetting = USB_G_ALT_INT_UAS, 1707 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1708 .bInterfaceSubClass = USB_SC_SCSI, 1709 .bInterfaceProtocol = USB_PR_UAS, 1710 }; 1711 1712 static struct usb_endpoint_descriptor uasp_bi_desc = { 1713 .bLength = USB_DT_ENDPOINT_SIZE, 1714 .bDescriptorType = USB_DT_ENDPOINT, 1715 .bEndpointAddress = USB_DIR_IN, 1716 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1717 .wMaxPacketSize = cpu_to_le16(512), 1718 }; 1719 1720 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1721 .bLength = USB_DT_ENDPOINT_SIZE, 1722 .bDescriptorType = USB_DT_ENDPOINT, 1723 .bEndpointAddress = USB_DIR_IN, 1724 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1725 }; 1726 1727 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1728 .bLength = sizeof(uasp_bi_pipe_desc), 1729 .bDescriptorType = USB_DT_PIPE_USAGE, 1730 .bPipeID = DATA_IN_PIPE_ID, 1731 }; 1732 1733 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1734 .bLength = USB_DT_ENDPOINT_SIZE, 1735 .bDescriptorType = USB_DT_ENDPOINT, 1736 .bEndpointAddress = USB_DIR_IN, 1737 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1738 .wMaxPacketSize = cpu_to_le16(1024), 1739 }; 1740 1741 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1742 .bLength = sizeof(uasp_bi_ep_comp_desc), 1743 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1744 .bMaxBurst = 0, 1745 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1746 .wBytesPerInterval = 0, 1747 }; 1748 1749 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1750 .bLength = sizeof(bot_bi_ep_comp_desc), 1751 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1752 .bMaxBurst = 0, 1753 }; 1754 1755 static struct usb_endpoint_descriptor uasp_bo_desc = { 1756 .bLength = USB_DT_ENDPOINT_SIZE, 1757 .bDescriptorType = USB_DT_ENDPOINT, 1758 .bEndpointAddress = USB_DIR_OUT, 1759 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1760 .wMaxPacketSize = cpu_to_le16(512), 1761 }; 1762 1763 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1764 .bLength = USB_DT_ENDPOINT_SIZE, 1765 .bDescriptorType = USB_DT_ENDPOINT, 1766 .bEndpointAddress = USB_DIR_OUT, 1767 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1768 }; 1769 1770 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1771 .bLength = sizeof(uasp_bo_pipe_desc), 1772 .bDescriptorType = USB_DT_PIPE_USAGE, 1773 .bPipeID = DATA_OUT_PIPE_ID, 1774 }; 1775 1776 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1777 .bLength = USB_DT_ENDPOINT_SIZE, 1778 .bDescriptorType = USB_DT_ENDPOINT, 1779 .bEndpointAddress = USB_DIR_OUT, 1780 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1781 .wMaxPacketSize = cpu_to_le16(0x400), 1782 }; 1783 1784 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1785 .bLength = sizeof(uasp_bo_ep_comp_desc), 1786 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1787 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1788 }; 1789 1790 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1791 .bLength = sizeof(bot_bo_ep_comp_desc), 1792 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1793 }; 1794 1795 static struct usb_endpoint_descriptor uasp_status_desc = { 1796 .bLength = USB_DT_ENDPOINT_SIZE, 1797 .bDescriptorType = USB_DT_ENDPOINT, 1798 .bEndpointAddress = USB_DIR_IN, 1799 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1800 .wMaxPacketSize = cpu_to_le16(512), 1801 }; 1802 1803 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1804 .bLength = USB_DT_ENDPOINT_SIZE, 1805 .bDescriptorType = USB_DT_ENDPOINT, 1806 .bEndpointAddress = USB_DIR_IN, 1807 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1808 }; 1809 1810 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1811 .bLength = sizeof(uasp_status_pipe_desc), 1812 .bDescriptorType = USB_DT_PIPE_USAGE, 1813 .bPipeID = STATUS_PIPE_ID, 1814 }; 1815 1816 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1817 .bLength = USB_DT_ENDPOINT_SIZE, 1818 .bDescriptorType = USB_DT_ENDPOINT, 1819 .bEndpointAddress = USB_DIR_IN, 1820 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1821 .wMaxPacketSize = cpu_to_le16(1024), 1822 }; 1823 1824 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1825 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1826 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1827 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1828 }; 1829 1830 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1831 .bLength = USB_DT_ENDPOINT_SIZE, 1832 .bDescriptorType = USB_DT_ENDPOINT, 1833 .bEndpointAddress = USB_DIR_OUT, 1834 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1835 .wMaxPacketSize = cpu_to_le16(512), 1836 }; 1837 1838 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1839 .bLength = USB_DT_ENDPOINT_SIZE, 1840 .bDescriptorType = USB_DT_ENDPOINT, 1841 .bEndpointAddress = USB_DIR_OUT, 1842 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1843 }; 1844 1845 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1846 .bLength = sizeof(uasp_cmd_pipe_desc), 1847 .bDescriptorType = USB_DT_PIPE_USAGE, 1848 .bPipeID = CMD_PIPE_ID, 1849 }; 1850 1851 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1852 .bLength = USB_DT_ENDPOINT_SIZE, 1853 .bDescriptorType = USB_DT_ENDPOINT, 1854 .bEndpointAddress = USB_DIR_OUT, 1855 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1856 .wMaxPacketSize = cpu_to_le16(1024), 1857 }; 1858 1859 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1860 .bLength = sizeof(uasp_cmd_comp_desc), 1861 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1862 }; 1863 1864 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1865 (struct usb_descriptor_header *) &bot_intf_desc, 1866 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1867 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1868 1869 (struct usb_descriptor_header *) &uasp_intf_desc, 1870 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1871 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1872 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1873 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1874 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1875 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1876 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1877 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1878 NULL, 1879 }; 1880 1881 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1882 (struct usb_descriptor_header *) &bot_intf_desc, 1883 (struct usb_descriptor_header *) &uasp_bi_desc, 1884 (struct usb_descriptor_header *) &uasp_bo_desc, 1885 1886 (struct usb_descriptor_header *) &uasp_intf_desc, 1887 (struct usb_descriptor_header *) &uasp_bi_desc, 1888 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1889 (struct usb_descriptor_header *) &uasp_bo_desc, 1890 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1891 (struct usb_descriptor_header *) &uasp_status_desc, 1892 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1893 (struct usb_descriptor_header *) &uasp_cmd_desc, 1894 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1895 NULL, 1896 }; 1897 1898 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1899 (struct usb_descriptor_header *) &bot_intf_desc, 1900 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1901 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1902 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1903 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1904 1905 (struct usb_descriptor_header *) &uasp_intf_desc, 1906 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1907 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1908 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1909 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1910 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1911 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1912 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1913 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1914 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1915 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1916 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1917 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1918 NULL, 1919 }; 1920 1921 static struct usb_string tcm_us_strings[] = { 1922 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1923 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1924 { }, 1925 }; 1926 1927 static struct usb_gadget_strings tcm_stringtab = { 1928 .language = 0x0409, 1929 .strings = tcm_us_strings, 1930 }; 1931 1932 static struct usb_gadget_strings *tcm_strings[] = { 1933 &tcm_stringtab, 1934 NULL, 1935 }; 1936 1937 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1938 { 1939 struct f_uas *fu = to_f_uas(f); 1940 struct usb_string *us; 1941 struct usb_gadget *gadget = c->cdev->gadget; 1942 struct usb_ep *ep; 1943 struct f_tcm_opts *opts; 1944 int iface; 1945 int ret; 1946 1947 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1948 1949 mutex_lock(&opts->dep_lock); 1950 if (!opts->can_attach) { 1951 mutex_unlock(&opts->dep_lock); 1952 return -ENODEV; 1953 } 1954 mutex_unlock(&opts->dep_lock); 1955 us = usb_gstrings_attach(c->cdev, tcm_strings, 1956 ARRAY_SIZE(tcm_us_strings)); 1957 if (IS_ERR(us)) 1958 return PTR_ERR(us); 1959 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 1960 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 1961 1962 iface = usb_interface_id(c, f); 1963 if (iface < 0) 1964 return iface; 1965 1966 bot_intf_desc.bInterfaceNumber = iface; 1967 uasp_intf_desc.bInterfaceNumber = iface; 1968 fu->iface = iface; 1969 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 1970 &uasp_bi_ep_comp_desc); 1971 if (!ep) 1972 goto ep_fail; 1973 1974 fu->ep_in = ep; 1975 1976 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 1977 &uasp_bo_ep_comp_desc); 1978 if (!ep) 1979 goto ep_fail; 1980 fu->ep_out = ep; 1981 1982 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 1983 &uasp_status_in_ep_comp_desc); 1984 if (!ep) 1985 goto ep_fail; 1986 fu->ep_status = ep; 1987 1988 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 1989 &uasp_cmd_comp_desc); 1990 if (!ep) 1991 goto ep_fail; 1992 fu->ep_cmd = ep; 1993 1994 /* Assume endpoint addresses are the same for both speeds */ 1995 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 1996 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 1997 uasp_status_desc.bEndpointAddress = 1998 uasp_ss_status_desc.bEndpointAddress; 1999 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2000 2001 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2002 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2003 uasp_fs_status_desc.bEndpointAddress = 2004 uasp_ss_status_desc.bEndpointAddress; 2005 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2006 2007 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2008 uasp_hs_function_desc, uasp_ss_function_desc, 2009 uasp_ss_function_desc); 2010 if (ret) 2011 goto ep_fail; 2012 2013 return 0; 2014 ep_fail: 2015 pr_err("Can't claim all required eps\n"); 2016 2017 return -ENOTSUPP; 2018 } 2019 2020 struct guas_setup_wq { 2021 struct work_struct work; 2022 struct f_uas *fu; 2023 unsigned int alt; 2024 }; 2025 2026 static void tcm_delayed_set_alt(struct work_struct *wq) 2027 { 2028 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2029 work); 2030 struct f_uas *fu = work->fu; 2031 int alt = work->alt; 2032 2033 kfree(work); 2034 2035 if (fu->flags & USBG_IS_BOT) 2036 bot_cleanup_old_alt(fu); 2037 if (fu->flags & USBG_IS_UAS) 2038 uasp_cleanup_old_alt(fu); 2039 2040 if (alt == USB_G_ALT_INT_BBB) 2041 bot_set_alt(fu); 2042 else if (alt == USB_G_ALT_INT_UAS) 2043 uasp_set_alt(fu); 2044 usb_composite_setup_continue(fu->function.config->cdev); 2045 } 2046 2047 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2048 { 2049 if (intf == bot_intf_desc.bInterfaceNumber) 2050 return USB_G_ALT_INT_BBB; 2051 if (intf == uasp_intf_desc.bInterfaceNumber) 2052 return USB_G_ALT_INT_UAS; 2053 2054 return -EOPNOTSUPP; 2055 } 2056 2057 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2058 { 2059 struct f_uas *fu = to_f_uas(f); 2060 2061 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2062 struct guas_setup_wq *work; 2063 2064 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2065 if (!work) 2066 return -ENOMEM; 2067 INIT_WORK(&work->work, tcm_delayed_set_alt); 2068 work->fu = fu; 2069 work->alt = alt; 2070 schedule_work(&work->work); 2071 return USB_GADGET_DELAYED_STATUS; 2072 } 2073 return -EOPNOTSUPP; 2074 } 2075 2076 static void tcm_disable(struct usb_function *f) 2077 { 2078 struct f_uas *fu = to_f_uas(f); 2079 2080 if (fu->flags & USBG_IS_UAS) 2081 uasp_cleanup_old_alt(fu); 2082 else if (fu->flags & USBG_IS_BOT) 2083 bot_cleanup_old_alt(fu); 2084 fu->flags = 0; 2085 } 2086 2087 static int tcm_setup(struct usb_function *f, 2088 const struct usb_ctrlrequest *ctrl) 2089 { 2090 struct f_uas *fu = to_f_uas(f); 2091 2092 if (!(fu->flags & USBG_IS_BOT)) 2093 return -EOPNOTSUPP; 2094 2095 return usbg_bot_setup(f, ctrl); 2096 } 2097 2098 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2099 { 2100 return container_of(to_config_group(item), struct f_tcm_opts, 2101 func_inst.group); 2102 } 2103 2104 static void tcm_attr_release(struct config_item *item) 2105 { 2106 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2107 2108 usb_put_function_instance(&opts->func_inst); 2109 } 2110 2111 static struct configfs_item_operations tcm_item_ops = { 2112 .release = tcm_attr_release, 2113 }; 2114 2115 static const struct config_item_type tcm_func_type = { 2116 .ct_item_ops = &tcm_item_ops, 2117 .ct_owner = THIS_MODULE, 2118 }; 2119 2120 static void tcm_free_inst(struct usb_function_instance *f) 2121 { 2122 struct f_tcm_opts *opts; 2123 unsigned i; 2124 2125 opts = container_of(f, struct f_tcm_opts, func_inst); 2126 2127 mutex_lock(&tpg_instances_lock); 2128 for (i = 0; i < TPG_INSTANCES; ++i) 2129 if (tpg_instances[i].func_inst == f) 2130 break; 2131 if (i < TPG_INSTANCES) 2132 tpg_instances[i].func_inst = NULL; 2133 mutex_unlock(&tpg_instances_lock); 2134 2135 kfree(opts); 2136 } 2137 2138 static int tcm_register_callback(struct usb_function_instance *f) 2139 { 2140 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2141 2142 mutex_lock(&opts->dep_lock); 2143 opts->can_attach = true; 2144 mutex_unlock(&opts->dep_lock); 2145 2146 return 0; 2147 } 2148 2149 static void tcm_unregister_callback(struct usb_function_instance *f) 2150 { 2151 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2152 2153 mutex_lock(&opts->dep_lock); 2154 unregister_gadget_item(opts-> 2155 func_inst.group.cg_item.ci_parent->ci_parent); 2156 opts->can_attach = false; 2157 mutex_unlock(&opts->dep_lock); 2158 } 2159 2160 static int usbg_attach(struct usbg_tpg *tpg) 2161 { 2162 struct usb_function_instance *f = tpg->fi; 2163 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2164 2165 if (opts->tcm_register_callback) 2166 return opts->tcm_register_callback(f); 2167 2168 return 0; 2169 } 2170 2171 static void usbg_detach(struct usbg_tpg *tpg) 2172 { 2173 struct usb_function_instance *f = tpg->fi; 2174 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2175 2176 if (opts->tcm_unregister_callback) 2177 opts->tcm_unregister_callback(f); 2178 } 2179 2180 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2181 { 2182 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2183 2184 pr_debug("tcm: Activating %s\n", name); 2185 2186 mutex_lock(&opts->dep_lock); 2187 opts->ready = true; 2188 mutex_unlock(&opts->dep_lock); 2189 2190 return 0; 2191 } 2192 2193 static struct usb_function_instance *tcm_alloc_inst(void) 2194 { 2195 struct f_tcm_opts *opts; 2196 int i; 2197 2198 2199 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2200 if (!opts) 2201 return ERR_PTR(-ENOMEM); 2202 2203 mutex_lock(&tpg_instances_lock); 2204 for (i = 0; i < TPG_INSTANCES; ++i) 2205 if (!tpg_instances[i].func_inst) 2206 break; 2207 2208 if (i == TPG_INSTANCES) { 2209 mutex_unlock(&tpg_instances_lock); 2210 kfree(opts); 2211 return ERR_PTR(-EBUSY); 2212 } 2213 tpg_instances[i].func_inst = &opts->func_inst; 2214 mutex_unlock(&tpg_instances_lock); 2215 2216 mutex_init(&opts->dep_lock); 2217 opts->func_inst.set_inst_name = tcm_set_name; 2218 opts->func_inst.free_func_inst = tcm_free_inst; 2219 opts->tcm_register_callback = tcm_register_callback; 2220 opts->tcm_unregister_callback = tcm_unregister_callback; 2221 2222 config_group_init_type_name(&opts->func_inst.group, "", 2223 &tcm_func_type); 2224 2225 return &opts->func_inst; 2226 } 2227 2228 static void tcm_free(struct usb_function *f) 2229 { 2230 struct f_uas *tcm = to_f_uas(f); 2231 2232 kfree(tcm); 2233 } 2234 2235 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2236 { 2237 usb_free_all_descriptors(f); 2238 } 2239 2240 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2241 { 2242 struct f_uas *fu; 2243 unsigned i; 2244 2245 mutex_lock(&tpg_instances_lock); 2246 for (i = 0; i < TPG_INSTANCES; ++i) 2247 if (tpg_instances[i].func_inst == fi) 2248 break; 2249 if (i == TPG_INSTANCES) { 2250 mutex_unlock(&tpg_instances_lock); 2251 return ERR_PTR(-ENODEV); 2252 } 2253 2254 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2255 if (!fu) { 2256 mutex_unlock(&tpg_instances_lock); 2257 return ERR_PTR(-ENOMEM); 2258 } 2259 2260 fu->function.name = "Target Function"; 2261 fu->function.bind = tcm_bind; 2262 fu->function.unbind = tcm_unbind; 2263 fu->function.set_alt = tcm_set_alt; 2264 fu->function.get_alt = tcm_get_alt; 2265 fu->function.setup = tcm_setup; 2266 fu->function.disable = tcm_disable; 2267 fu->function.free_func = tcm_free; 2268 fu->tpg = tpg_instances[i].tpg; 2269 mutex_unlock(&tpg_instances_lock); 2270 2271 return &fu->function; 2272 } 2273 2274 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2275 2276 static int __init tcm_init(void) 2277 { 2278 int ret; 2279 2280 ret = usb_function_register(&tcmusb_func); 2281 if (ret) 2282 return ret; 2283 2284 ret = target_register_template(&usbg_ops); 2285 if (ret) 2286 usb_function_unregister(&tcmusb_func); 2287 2288 return ret; 2289 } 2290 module_init(tcm_init); 2291 2292 static void __exit tcm_exit(void) 2293 { 2294 target_unregister_template(&usbg_ops); 2295 usb_function_unregister(&tcmusb_func); 2296 } 2297 module_exit(tcm_exit); 2298 2299 MODULE_DESCRIPTION("Target based USB-Gadget"); 2300 MODULE_LICENSE("GPL"); 2301 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2302