1 // SPDX-License-Identifier: GPL-2.0 2 /* Target based USB-Gadget 3 * 4 * UAS protocol handling, target callbacks, configfs handling, 5 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling. 6 * 7 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de> 8 */ 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/string.h> 13 #include <linux/configfs.h> 14 #include <linux/ctype.h> 15 #include <linux/usb/ch9.h> 16 #include <linux/usb/composite.h> 17 #include <linux/usb/gadget.h> 18 #include <linux/usb/storage.h> 19 #include <scsi/scsi_tcq.h> 20 #include <target/target_core_base.h> 21 #include <target/target_core_fabric.h> 22 #include <asm/unaligned.h> 23 24 #include "tcm.h" 25 #include "u_tcm.h" 26 #include "configfs.h" 27 28 #define TPG_INSTANCES 1 29 30 struct tpg_instance { 31 struct usb_function_instance *func_inst; 32 struct usbg_tpg *tpg; 33 }; 34 35 static struct tpg_instance tpg_instances[TPG_INSTANCES]; 36 37 static DEFINE_MUTEX(tpg_instances_lock); 38 39 static inline struct f_uas *to_f_uas(struct usb_function *f) 40 { 41 return container_of(f, struct f_uas, function); 42 } 43 44 /* Start bot.c code */ 45 46 static int bot_enqueue_cmd_cbw(struct f_uas *fu) 47 { 48 int ret; 49 50 if (fu->flags & USBG_BOT_CMD_PEND) 51 return 0; 52 53 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC); 54 if (!ret) 55 fu->flags |= USBG_BOT_CMD_PEND; 56 return ret; 57 } 58 59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req) 60 { 61 struct usbg_cmd *cmd = req->context; 62 struct f_uas *fu = cmd->fu; 63 64 transport_generic_free_cmd(&cmd->se_cmd, 0); 65 if (req->status < 0) { 66 pr_err("ERR %s(%d)\n", __func__, __LINE__); 67 return; 68 } 69 70 /* CSW completed, wait for next CBW */ 71 bot_enqueue_cmd_cbw(fu); 72 } 73 74 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd) 75 { 76 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 77 int ret; 78 unsigned int csw_stat; 79 80 csw_stat = cmd->csw_code; 81 csw->Tag = cmd->bot_tag; 82 csw->Status = csw_stat; 83 fu->bot_status.req->context = cmd; 84 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC); 85 if (ret) 86 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 87 } 88 89 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req) 90 { 91 struct usbg_cmd *cmd = req->context; 92 struct f_uas *fu = cmd->fu; 93 94 if (req->status < 0) 95 pr_err("ERR %s(%d)\n", __func__, __LINE__); 96 97 if (cmd->data_len) { 98 if (cmd->data_len > ep->maxpacket) { 99 req->length = ep->maxpacket; 100 cmd->data_len -= ep->maxpacket; 101 } else { 102 req->length = cmd->data_len; 103 cmd->data_len = 0; 104 } 105 106 usb_ep_queue(ep, req, GFP_ATOMIC); 107 return; 108 } 109 bot_enqueue_sense_code(fu, cmd); 110 } 111 112 static void bot_send_bad_status(struct usbg_cmd *cmd) 113 { 114 struct f_uas *fu = cmd->fu; 115 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 116 struct usb_request *req; 117 struct usb_ep *ep; 118 119 csw->Residue = cpu_to_le32(cmd->data_len); 120 121 if (cmd->data_len) { 122 if (cmd->is_read) { 123 ep = fu->ep_in; 124 req = fu->bot_req_in; 125 } else { 126 ep = fu->ep_out; 127 req = fu->bot_req_out; 128 } 129 130 if (cmd->data_len > fu->ep_in->maxpacket) { 131 req->length = ep->maxpacket; 132 cmd->data_len -= ep->maxpacket; 133 } else { 134 req->length = cmd->data_len; 135 cmd->data_len = 0; 136 } 137 req->complete = bot_err_compl; 138 req->context = cmd; 139 req->buf = fu->cmd.buf; 140 usb_ep_queue(ep, req, GFP_KERNEL); 141 } else { 142 bot_enqueue_sense_code(fu, cmd); 143 } 144 } 145 146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data) 147 { 148 struct f_uas *fu = cmd->fu; 149 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 150 int ret; 151 152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) { 153 if (!moved_data && cmd->data_len) { 154 /* 155 * the host wants to move data, we don't. Fill / empty 156 * the pipe and then send the csw with reside set. 157 */ 158 cmd->csw_code = US_BULK_STAT_OK; 159 bot_send_bad_status(cmd); 160 return 0; 161 } 162 163 csw->Tag = cmd->bot_tag; 164 csw->Residue = cpu_to_le32(0); 165 csw->Status = US_BULK_STAT_OK; 166 fu->bot_status.req->context = cmd; 167 168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL); 169 if (ret) 170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 171 } else { 172 cmd->csw_code = US_BULK_STAT_FAIL; 173 bot_send_bad_status(cmd); 174 } 175 return 0; 176 } 177 178 /* 179 * Called after command (no data transfer) or after the write (to device) 180 * operation is completed 181 */ 182 static int bot_send_status_response(struct usbg_cmd *cmd) 183 { 184 bool moved_data = false; 185 186 if (!cmd->is_read) 187 moved_data = true; 188 return bot_send_status(cmd, moved_data); 189 } 190 191 /* Read request completed, now we have to send the CSW */ 192 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req) 193 { 194 struct usbg_cmd *cmd = req->context; 195 196 if (req->status < 0) 197 pr_err("ERR %s(%d)\n", __func__, __LINE__); 198 199 bot_send_status(cmd, true); 200 } 201 202 static int bot_send_read_response(struct usbg_cmd *cmd) 203 { 204 struct f_uas *fu = cmd->fu; 205 struct se_cmd *se_cmd = &cmd->se_cmd; 206 struct usb_gadget *gadget = fuas_to_gadget(fu); 207 int ret; 208 209 if (!cmd->data_len) { 210 cmd->csw_code = US_BULK_STAT_PHASE; 211 bot_send_bad_status(cmd); 212 return 0; 213 } 214 215 if (!gadget->sg_supported) { 216 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 217 if (!cmd->data_buf) 218 return -ENOMEM; 219 220 sg_copy_to_buffer(se_cmd->t_data_sg, 221 se_cmd->t_data_nents, 222 cmd->data_buf, 223 se_cmd->data_length); 224 225 fu->bot_req_in->buf = cmd->data_buf; 226 } else { 227 fu->bot_req_in->buf = NULL; 228 fu->bot_req_in->num_sgs = se_cmd->t_data_nents; 229 fu->bot_req_in->sg = se_cmd->t_data_sg; 230 } 231 232 fu->bot_req_in->complete = bot_read_compl; 233 fu->bot_req_in->length = se_cmd->data_length; 234 fu->bot_req_in->context = cmd; 235 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC); 236 if (ret) 237 pr_err("%s(%d)\n", __func__, __LINE__); 238 return 0; 239 } 240 241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); 242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); 243 244 static int bot_send_write_request(struct usbg_cmd *cmd) 245 { 246 struct f_uas *fu = cmd->fu; 247 struct se_cmd *se_cmd = &cmd->se_cmd; 248 struct usb_gadget *gadget = fuas_to_gadget(fu); 249 int ret; 250 251 init_completion(&cmd->write_complete); 252 cmd->fu = fu; 253 254 if (!cmd->data_len) { 255 cmd->csw_code = US_BULK_STAT_PHASE; 256 return -EINVAL; 257 } 258 259 if (!gadget->sg_supported) { 260 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL); 261 if (!cmd->data_buf) 262 return -ENOMEM; 263 264 fu->bot_req_out->buf = cmd->data_buf; 265 } else { 266 fu->bot_req_out->buf = NULL; 267 fu->bot_req_out->num_sgs = se_cmd->t_data_nents; 268 fu->bot_req_out->sg = se_cmd->t_data_sg; 269 } 270 271 fu->bot_req_out->complete = usbg_data_write_cmpl; 272 fu->bot_req_out->length = se_cmd->data_length; 273 fu->bot_req_out->context = cmd; 274 275 ret = usbg_prepare_w_request(cmd, fu->bot_req_out); 276 if (ret) 277 goto cleanup; 278 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); 279 if (ret) 280 pr_err("%s(%d)\n", __func__, __LINE__); 281 282 wait_for_completion(&cmd->write_complete); 283 target_execute_cmd(se_cmd); 284 cleanup: 285 return ret; 286 } 287 288 static int bot_submit_command(struct f_uas *, void *, unsigned int); 289 290 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) 291 { 292 struct f_uas *fu = req->context; 293 int ret; 294 295 fu->flags &= ~USBG_BOT_CMD_PEND; 296 297 if (req->status < 0) 298 return; 299 300 ret = bot_submit_command(fu, req->buf, req->actual); 301 if (ret) 302 pr_err("%s(%d): %d\n", __func__, __LINE__, ret); 303 } 304 305 static int bot_prepare_reqs(struct f_uas *fu) 306 { 307 int ret; 308 309 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 310 if (!fu->bot_req_in) 311 goto err; 312 313 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 314 if (!fu->bot_req_out) 315 goto err_out; 316 317 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 318 if (!fu->cmd.req) 319 goto err_cmd; 320 321 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 322 if (!fu->bot_status.req) 323 goto err_sts; 324 325 fu->bot_status.req->buf = &fu->bot_status.csw; 326 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; 327 fu->bot_status.req->complete = bot_status_complete; 328 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); 329 330 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); 331 if (!fu->cmd.buf) 332 goto err_buf; 333 334 fu->cmd.req->complete = bot_cmd_complete; 335 fu->cmd.req->buf = fu->cmd.buf; 336 fu->cmd.req->length = fu->ep_out->maxpacket; 337 fu->cmd.req->context = fu; 338 339 ret = bot_enqueue_cmd_cbw(fu); 340 if (ret) 341 goto err_queue; 342 return 0; 343 err_queue: 344 kfree(fu->cmd.buf); 345 fu->cmd.buf = NULL; 346 err_buf: 347 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 348 err_sts: 349 usb_ep_free_request(fu->ep_out, fu->cmd.req); 350 fu->cmd.req = NULL; 351 err_cmd: 352 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 353 fu->bot_req_out = NULL; 354 err_out: 355 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 356 fu->bot_req_in = NULL; 357 err: 358 pr_err("BOT: endpoint setup failed\n"); 359 return -ENOMEM; 360 } 361 362 static void bot_cleanup_old_alt(struct f_uas *fu) 363 { 364 if (!(fu->flags & USBG_ENABLED)) 365 return; 366 367 usb_ep_disable(fu->ep_in); 368 usb_ep_disable(fu->ep_out); 369 370 if (!fu->bot_req_in) 371 return; 372 373 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 374 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 375 usb_ep_free_request(fu->ep_out, fu->cmd.req); 376 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 377 378 kfree(fu->cmd.buf); 379 380 fu->bot_req_in = NULL; 381 fu->bot_req_out = NULL; 382 fu->cmd.req = NULL; 383 fu->bot_status.req = NULL; 384 fu->cmd.buf = NULL; 385 } 386 387 static void bot_set_alt(struct f_uas *fu) 388 { 389 struct usb_function *f = &fu->function; 390 struct usb_gadget *gadget = f->config->cdev->gadget; 391 int ret; 392 393 fu->flags = USBG_IS_BOT; 394 395 config_ep_by_speed(gadget, f, fu->ep_in); 396 ret = usb_ep_enable(fu->ep_in); 397 if (ret) 398 goto err_b_in; 399 400 config_ep_by_speed(gadget, f, fu->ep_out); 401 ret = usb_ep_enable(fu->ep_out); 402 if (ret) 403 goto err_b_out; 404 405 ret = bot_prepare_reqs(fu); 406 if (ret) 407 goto err_wq; 408 fu->flags |= USBG_ENABLED; 409 pr_info("Using the BOT protocol\n"); 410 return; 411 err_wq: 412 usb_ep_disable(fu->ep_out); 413 err_b_out: 414 usb_ep_disable(fu->ep_in); 415 err_b_in: 416 fu->flags = USBG_IS_BOT; 417 } 418 419 static int usbg_bot_setup(struct usb_function *f, 420 const struct usb_ctrlrequest *ctrl) 421 { 422 struct f_uas *fu = to_f_uas(f); 423 struct usb_composite_dev *cdev = f->config->cdev; 424 u16 w_value = le16_to_cpu(ctrl->wValue); 425 u16 w_length = le16_to_cpu(ctrl->wLength); 426 int luns; 427 u8 *ret_lun; 428 429 switch (ctrl->bRequest) { 430 case US_BULK_GET_MAX_LUN: 431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 432 USB_RECIP_INTERFACE)) 433 return -ENOTSUPP; 434 435 if (w_length < 1) 436 return -EINVAL; 437 if (w_value != 0) 438 return -EINVAL; 439 luns = atomic_read(&fu->tpg->tpg_port_count); 440 if (!luns) { 441 pr_err("No LUNs configured?\n"); 442 return -EINVAL; 443 } 444 /* 445 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be 446 * accessed. The upper limit is 0xf 447 */ 448 luns--; 449 if (luns > 0xf) { 450 pr_info_once("Limiting the number of luns to 16\n"); 451 luns = 0xf; 452 } 453 ret_lun = cdev->req->buf; 454 *ret_lun = luns; 455 cdev->req->length = 1; 456 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); 457 458 case US_BULK_RESET_REQUEST: 459 /* XXX maybe we should remove previous requests for IN + OUT */ 460 bot_enqueue_cmd_cbw(fu); 461 return 0; 462 } 463 return -ENOTSUPP; 464 } 465 466 /* Start uas.c code */ 467 468 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) 469 { 470 /* We have either all three allocated or none */ 471 if (!stream->req_in) 472 return; 473 474 usb_ep_free_request(fu->ep_in, stream->req_in); 475 usb_ep_free_request(fu->ep_out, stream->req_out); 476 usb_ep_free_request(fu->ep_status, stream->req_status); 477 478 stream->req_in = NULL; 479 stream->req_out = NULL; 480 stream->req_status = NULL; 481 } 482 483 static void uasp_free_cmdreq(struct f_uas *fu) 484 { 485 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 486 kfree(fu->cmd.buf); 487 fu->cmd.req = NULL; 488 fu->cmd.buf = NULL; 489 } 490 491 static void uasp_cleanup_old_alt(struct f_uas *fu) 492 { 493 int i; 494 495 if (!(fu->flags & USBG_ENABLED)) 496 return; 497 498 usb_ep_disable(fu->ep_in); 499 usb_ep_disable(fu->ep_out); 500 usb_ep_disable(fu->ep_status); 501 usb_ep_disable(fu->ep_cmd); 502 503 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++) 504 uasp_cleanup_one_stream(fu, &fu->stream[i]); 505 uasp_free_cmdreq(fu); 506 } 507 508 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 509 510 static int uasp_prepare_r_request(struct usbg_cmd *cmd) 511 { 512 struct se_cmd *se_cmd = &cmd->se_cmd; 513 struct f_uas *fu = cmd->fu; 514 struct usb_gadget *gadget = fuas_to_gadget(fu); 515 struct uas_stream *stream = cmd->stream; 516 517 if (!gadget->sg_supported) { 518 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 519 if (!cmd->data_buf) 520 return -ENOMEM; 521 522 sg_copy_to_buffer(se_cmd->t_data_sg, 523 se_cmd->t_data_nents, 524 cmd->data_buf, 525 se_cmd->data_length); 526 527 stream->req_in->buf = cmd->data_buf; 528 } else { 529 stream->req_in->buf = NULL; 530 stream->req_in->num_sgs = se_cmd->t_data_nents; 531 stream->req_in->sg = se_cmd->t_data_sg; 532 } 533 534 stream->req_in->complete = uasp_status_data_cmpl; 535 stream->req_in->length = se_cmd->data_length; 536 stream->req_in->context = cmd; 537 538 cmd->state = UASP_SEND_STATUS; 539 return 0; 540 } 541 542 static void uasp_prepare_status(struct usbg_cmd *cmd) 543 { 544 struct se_cmd *se_cmd = &cmd->se_cmd; 545 struct sense_iu *iu = &cmd->sense_iu; 546 struct uas_stream *stream = cmd->stream; 547 548 cmd->state = UASP_QUEUE_COMMAND; 549 iu->iu_id = IU_ID_STATUS; 550 iu->tag = cpu_to_be16(cmd->tag); 551 552 /* 553 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 554 */ 555 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 556 iu->status = se_cmd->scsi_status; 557 stream->req_status->context = cmd; 558 stream->req_status->length = se_cmd->scsi_sense_length + 16; 559 stream->req_status->buf = iu; 560 stream->req_status->complete = uasp_status_data_cmpl; 561 } 562 563 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 564 { 565 struct usbg_cmd *cmd = req->context; 566 struct uas_stream *stream = cmd->stream; 567 struct f_uas *fu = cmd->fu; 568 int ret; 569 570 if (req->status < 0) 571 goto cleanup; 572 573 switch (cmd->state) { 574 case UASP_SEND_DATA: 575 ret = uasp_prepare_r_request(cmd); 576 if (ret) 577 goto cleanup; 578 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 579 if (ret) 580 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 581 break; 582 583 case UASP_RECEIVE_DATA: 584 ret = usbg_prepare_w_request(cmd, stream->req_out); 585 if (ret) 586 goto cleanup; 587 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 588 if (ret) 589 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 590 break; 591 592 case UASP_SEND_STATUS: 593 uasp_prepare_status(cmd); 594 ret = usb_ep_queue(fu->ep_status, stream->req_status, 595 GFP_ATOMIC); 596 if (ret) 597 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 598 break; 599 600 case UASP_QUEUE_COMMAND: 601 transport_generic_free_cmd(&cmd->se_cmd, 0); 602 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 603 break; 604 605 default: 606 BUG(); 607 } 608 return; 609 610 cleanup: 611 transport_generic_free_cmd(&cmd->se_cmd, 0); 612 } 613 614 static int uasp_send_status_response(struct usbg_cmd *cmd) 615 { 616 struct f_uas *fu = cmd->fu; 617 struct uas_stream *stream = cmd->stream; 618 struct sense_iu *iu = &cmd->sense_iu; 619 620 iu->tag = cpu_to_be16(cmd->tag); 621 stream->req_status->complete = uasp_status_data_cmpl; 622 stream->req_status->context = cmd; 623 cmd->fu = fu; 624 uasp_prepare_status(cmd); 625 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 626 } 627 628 static int uasp_send_read_response(struct usbg_cmd *cmd) 629 { 630 struct f_uas *fu = cmd->fu; 631 struct uas_stream *stream = cmd->stream; 632 struct sense_iu *iu = &cmd->sense_iu; 633 int ret; 634 635 cmd->fu = fu; 636 637 iu->tag = cpu_to_be16(cmd->tag); 638 if (fu->flags & USBG_USE_STREAMS) { 639 640 ret = uasp_prepare_r_request(cmd); 641 if (ret) 642 goto out; 643 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 644 if (ret) { 645 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 646 kfree(cmd->data_buf); 647 cmd->data_buf = NULL; 648 } 649 650 } else { 651 652 iu->iu_id = IU_ID_READ_READY; 653 iu->tag = cpu_to_be16(cmd->tag); 654 655 stream->req_status->complete = uasp_status_data_cmpl; 656 stream->req_status->context = cmd; 657 658 cmd->state = UASP_SEND_DATA; 659 stream->req_status->buf = iu; 660 stream->req_status->length = sizeof(struct iu); 661 662 ret = usb_ep_queue(fu->ep_status, stream->req_status, 663 GFP_ATOMIC); 664 if (ret) 665 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 666 } 667 out: 668 return ret; 669 } 670 671 static int uasp_send_write_request(struct usbg_cmd *cmd) 672 { 673 struct f_uas *fu = cmd->fu; 674 struct se_cmd *se_cmd = &cmd->se_cmd; 675 struct uas_stream *stream = cmd->stream; 676 struct sense_iu *iu = &cmd->sense_iu; 677 int ret; 678 679 init_completion(&cmd->write_complete); 680 cmd->fu = fu; 681 682 iu->tag = cpu_to_be16(cmd->tag); 683 684 if (fu->flags & USBG_USE_STREAMS) { 685 686 ret = usbg_prepare_w_request(cmd, stream->req_out); 687 if (ret) 688 goto cleanup; 689 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 690 if (ret) 691 pr_err("%s(%d)\n", __func__, __LINE__); 692 693 } else { 694 695 iu->iu_id = IU_ID_WRITE_READY; 696 iu->tag = cpu_to_be16(cmd->tag); 697 698 stream->req_status->complete = uasp_status_data_cmpl; 699 stream->req_status->context = cmd; 700 701 cmd->state = UASP_RECEIVE_DATA; 702 stream->req_status->buf = iu; 703 stream->req_status->length = sizeof(struct iu); 704 705 ret = usb_ep_queue(fu->ep_status, stream->req_status, 706 GFP_ATOMIC); 707 if (ret) 708 pr_err("%s(%d)\n", __func__, __LINE__); 709 } 710 711 wait_for_completion(&cmd->write_complete); 712 target_execute_cmd(se_cmd); 713 cleanup: 714 return ret; 715 } 716 717 static int usbg_submit_command(struct f_uas *, void *, unsigned int); 718 719 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 720 { 721 struct f_uas *fu = req->context; 722 int ret; 723 724 if (req->status < 0) 725 return; 726 727 ret = usbg_submit_command(fu, req->buf, req->actual); 728 /* 729 * Once we tune for performance enqueue the command req here again so 730 * we can receive a second command while we processing this one. Pay 731 * attention to properly sync STAUS endpoint with DATA IN + OUT so you 732 * don't break HS. 733 */ 734 if (!ret) 735 return; 736 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 737 } 738 739 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 740 { 741 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 742 if (!stream->req_in) 743 goto out; 744 745 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 746 if (!stream->req_out) 747 goto err_out; 748 749 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 750 if (!stream->req_status) 751 goto err_sts; 752 753 return 0; 754 err_sts: 755 usb_ep_free_request(fu->ep_status, stream->req_status); 756 stream->req_status = NULL; 757 err_out: 758 usb_ep_free_request(fu->ep_out, stream->req_out); 759 stream->req_out = NULL; 760 out: 761 return -ENOMEM; 762 } 763 764 static int uasp_alloc_cmd(struct f_uas *fu) 765 { 766 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 767 if (!fu->cmd.req) 768 goto err; 769 770 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 771 if (!fu->cmd.buf) 772 goto err_buf; 773 774 fu->cmd.req->complete = uasp_cmd_complete; 775 fu->cmd.req->buf = fu->cmd.buf; 776 fu->cmd.req->length = fu->ep_cmd->maxpacket; 777 fu->cmd.req->context = fu; 778 return 0; 779 780 err_buf: 781 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 782 err: 783 return -ENOMEM; 784 } 785 786 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams) 787 { 788 int i; 789 790 for (i = 0; i < max_streams; i++) { 791 struct uas_stream *s = &fu->stream[i]; 792 793 s->req_in->stream_id = i + 1; 794 s->req_out->stream_id = i + 1; 795 s->req_status->stream_id = i + 1; 796 } 797 } 798 799 static int uasp_prepare_reqs(struct f_uas *fu) 800 { 801 int ret; 802 int i; 803 int max_streams; 804 805 if (fu->flags & USBG_USE_STREAMS) 806 max_streams = UASP_SS_EP_COMP_NUM_STREAMS; 807 else 808 max_streams = 1; 809 810 for (i = 0; i < max_streams; i++) { 811 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 812 if (ret) 813 goto err_cleanup; 814 } 815 816 ret = uasp_alloc_cmd(fu); 817 if (ret) 818 goto err_free_stream; 819 uasp_setup_stream_res(fu, max_streams); 820 821 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 822 if (ret) 823 goto err_free_stream; 824 825 return 0; 826 827 err_free_stream: 828 uasp_free_cmdreq(fu); 829 830 err_cleanup: 831 if (i) { 832 do { 833 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 834 i--; 835 } while (i); 836 } 837 pr_err("UASP: endpoint setup failed\n"); 838 return ret; 839 } 840 841 static void uasp_set_alt(struct f_uas *fu) 842 { 843 struct usb_function *f = &fu->function; 844 struct usb_gadget *gadget = f->config->cdev->gadget; 845 int ret; 846 847 fu->flags = USBG_IS_UAS; 848 849 if (gadget->speed >= USB_SPEED_SUPER) 850 fu->flags |= USBG_USE_STREAMS; 851 852 config_ep_by_speed(gadget, f, fu->ep_in); 853 ret = usb_ep_enable(fu->ep_in); 854 if (ret) 855 goto err_b_in; 856 857 config_ep_by_speed(gadget, f, fu->ep_out); 858 ret = usb_ep_enable(fu->ep_out); 859 if (ret) 860 goto err_b_out; 861 862 config_ep_by_speed(gadget, f, fu->ep_cmd); 863 ret = usb_ep_enable(fu->ep_cmd); 864 if (ret) 865 goto err_cmd; 866 config_ep_by_speed(gadget, f, fu->ep_status); 867 ret = usb_ep_enable(fu->ep_status); 868 if (ret) 869 goto err_status; 870 871 ret = uasp_prepare_reqs(fu); 872 if (ret) 873 goto err_wq; 874 fu->flags |= USBG_ENABLED; 875 876 pr_info("Using the UAS protocol\n"); 877 return; 878 err_wq: 879 usb_ep_disable(fu->ep_status); 880 err_status: 881 usb_ep_disable(fu->ep_cmd); 882 err_cmd: 883 usb_ep_disable(fu->ep_out); 884 err_b_out: 885 usb_ep_disable(fu->ep_in); 886 err_b_in: 887 fu->flags = 0; 888 } 889 890 static int get_cmd_dir(const unsigned char *cdb) 891 { 892 int ret; 893 894 switch (cdb[0]) { 895 case READ_6: 896 case READ_10: 897 case READ_12: 898 case READ_16: 899 case INQUIRY: 900 case MODE_SENSE: 901 case MODE_SENSE_10: 902 case SERVICE_ACTION_IN_16: 903 case MAINTENANCE_IN: 904 case PERSISTENT_RESERVE_IN: 905 case SECURITY_PROTOCOL_IN: 906 case ACCESS_CONTROL_IN: 907 case REPORT_LUNS: 908 case READ_BLOCK_LIMITS: 909 case READ_POSITION: 910 case READ_CAPACITY: 911 case READ_TOC: 912 case READ_FORMAT_CAPACITIES: 913 case REQUEST_SENSE: 914 ret = DMA_FROM_DEVICE; 915 break; 916 917 case WRITE_6: 918 case WRITE_10: 919 case WRITE_12: 920 case WRITE_16: 921 case MODE_SELECT: 922 case MODE_SELECT_10: 923 case WRITE_VERIFY: 924 case WRITE_VERIFY_12: 925 case PERSISTENT_RESERVE_OUT: 926 case MAINTENANCE_OUT: 927 case SECURITY_PROTOCOL_OUT: 928 case ACCESS_CONTROL_OUT: 929 ret = DMA_TO_DEVICE; 930 break; 931 case ALLOW_MEDIUM_REMOVAL: 932 case TEST_UNIT_READY: 933 case SYNCHRONIZE_CACHE: 934 case START_STOP: 935 case ERASE: 936 case REZERO_UNIT: 937 case SEEK_10: 938 case SPACE: 939 case VERIFY: 940 case WRITE_FILEMARKS: 941 ret = DMA_NONE; 942 break; 943 default: 944 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 945 pr_warn(CMD_DIR_MSG, cdb[0]); 946 #undef CMD_DIR_MSG 947 ret = -EINVAL; 948 } 949 return ret; 950 } 951 952 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 953 { 954 struct usbg_cmd *cmd = req->context; 955 struct se_cmd *se_cmd = &cmd->se_cmd; 956 957 if (req->status < 0) { 958 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 959 goto cleanup; 960 } 961 962 if (req->num_sgs == 0) { 963 sg_copy_from_buffer(se_cmd->t_data_sg, 964 se_cmd->t_data_nents, 965 cmd->data_buf, 966 se_cmd->data_length); 967 } 968 969 complete(&cmd->write_complete); 970 return; 971 972 cleanup: 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->complete = usbg_data_write_cmpl; 995 req->length = se_cmd->data_length; 996 req->context = cmd; 997 return 0; 998 } 999 1000 static int usbg_send_status_response(struct se_cmd *se_cmd) 1001 { 1002 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1003 se_cmd); 1004 struct f_uas *fu = cmd->fu; 1005 1006 if (fu->flags & USBG_IS_BOT) 1007 return bot_send_status_response(cmd); 1008 else 1009 return uasp_send_status_response(cmd); 1010 } 1011 1012 static int usbg_send_write_request(struct se_cmd *se_cmd) 1013 { 1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1015 se_cmd); 1016 struct f_uas *fu = cmd->fu; 1017 1018 if (fu->flags & USBG_IS_BOT) 1019 return bot_send_write_request(cmd); 1020 else 1021 return uasp_send_write_request(cmd); 1022 } 1023 1024 static int usbg_send_read_response(struct se_cmd *se_cmd) 1025 { 1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1027 se_cmd); 1028 struct f_uas *fu = cmd->fu; 1029 1030 if (fu->flags & USBG_IS_BOT) 1031 return bot_send_read_response(cmd); 1032 else 1033 return uasp_send_read_response(cmd); 1034 } 1035 1036 static void usbg_cmd_work(struct work_struct *work) 1037 { 1038 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1039 struct se_cmd *se_cmd; 1040 struct tcm_usbg_nexus *tv_nexus; 1041 struct usbg_tpg *tpg; 1042 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1043 1044 se_cmd = &cmd->se_cmd; 1045 tpg = cmd->fu->tpg; 1046 tv_nexus = tpg->tpg_nexus; 1047 dir = get_cmd_dir(cmd->cmd_buf); 1048 if (dir < 0) { 1049 transport_init_se_cmd(se_cmd, 1050 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1051 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1052 cmd->prio_attr, cmd->sense_iu.sense); 1053 goto out; 1054 } 1055 1056 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1057 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1058 cmd->prio_attr, dir, flags) < 0) 1059 goto out; 1060 1061 return; 1062 1063 out: 1064 transport_send_check_condition_and_sense(se_cmd, 1065 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1066 transport_generic_free_cmd(&cmd->se_cmd, 0); 1067 } 1068 1069 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1070 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1071 { 1072 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1073 struct usbg_cmd *cmd; 1074 int tag, cpu; 1075 1076 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1077 if (tag < 0) 1078 return ERR_PTR(-ENOMEM); 1079 1080 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1081 memset(cmd, 0, sizeof(*cmd)); 1082 cmd->se_cmd.map_tag = tag; 1083 cmd->se_cmd.map_cpu = cpu; 1084 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1085 cmd->fu = fu; 1086 1087 return cmd; 1088 } 1089 1090 static void usbg_release_cmd(struct se_cmd *); 1091 1092 static int usbg_submit_command(struct f_uas *fu, 1093 void *cmdbuf, unsigned int len) 1094 { 1095 struct command_iu *cmd_iu = cmdbuf; 1096 struct usbg_cmd *cmd; 1097 struct usbg_tpg *tpg = fu->tpg; 1098 struct tcm_usbg_nexus *tv_nexus; 1099 u32 cmd_len; 1100 u16 scsi_tag; 1101 1102 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1103 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1104 return -EINVAL; 1105 } 1106 1107 tv_nexus = tpg->tpg_nexus; 1108 if (!tv_nexus) { 1109 pr_err("Missing nexus, ignoring command\n"); 1110 return -EINVAL; 1111 } 1112 1113 cmd_len = (cmd_iu->len & ~0x3) + 16; 1114 if (cmd_len > USBG_MAX_CMD) 1115 return -EINVAL; 1116 1117 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1118 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1119 if (IS_ERR(cmd)) { 1120 pr_err("usbg_get_cmd failed\n"); 1121 return -ENOMEM; 1122 } 1123 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1124 1125 if (fu->flags & USBG_USE_STREAMS) { 1126 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) 1127 goto err; 1128 if (!cmd->tag) 1129 cmd->stream = &fu->stream[0]; 1130 else 1131 cmd->stream = &fu->stream[cmd->tag - 1]; 1132 } else { 1133 cmd->stream = &fu->stream[0]; 1134 } 1135 1136 switch (cmd_iu->prio_attr & 0x7) { 1137 case UAS_HEAD_TAG: 1138 cmd->prio_attr = TCM_HEAD_TAG; 1139 break; 1140 case UAS_ORDERED_TAG: 1141 cmd->prio_attr = TCM_ORDERED_TAG; 1142 break; 1143 case UAS_ACA: 1144 cmd->prio_attr = TCM_ACA_TAG; 1145 break; 1146 default: 1147 pr_debug_once("Unsupported prio_attr: %02x.\n", 1148 cmd_iu->prio_attr); 1149 /* fall through */ 1150 case UAS_SIMPLE_TAG: 1151 cmd->prio_attr = TCM_SIMPLE_TAG; 1152 break; 1153 } 1154 1155 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1156 1157 INIT_WORK(&cmd->work, usbg_cmd_work); 1158 queue_work(tpg->workqueue, &cmd->work); 1159 1160 return 0; 1161 err: 1162 usbg_release_cmd(&cmd->se_cmd); 1163 return -EINVAL; 1164 } 1165 1166 static void bot_cmd_work(struct work_struct *work) 1167 { 1168 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1169 struct se_cmd *se_cmd; 1170 struct tcm_usbg_nexus *tv_nexus; 1171 struct usbg_tpg *tpg; 1172 int dir; 1173 1174 se_cmd = &cmd->se_cmd; 1175 tpg = cmd->fu->tpg; 1176 tv_nexus = tpg->tpg_nexus; 1177 dir = get_cmd_dir(cmd->cmd_buf); 1178 if (dir < 0) { 1179 transport_init_se_cmd(se_cmd, 1180 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1181 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1182 cmd->prio_attr, cmd->sense_iu.sense); 1183 goto out; 1184 } 1185 1186 if (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) < 0) 1189 goto out; 1190 1191 return; 1192 1193 out: 1194 transport_send_check_condition_and_sense(se_cmd, 1195 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1196 transport_generic_free_cmd(&cmd->se_cmd, 0); 1197 } 1198 1199 static int bot_submit_command(struct f_uas *fu, 1200 void *cmdbuf, unsigned int len) 1201 { 1202 struct bulk_cb_wrap *cbw = cmdbuf; 1203 struct usbg_cmd *cmd; 1204 struct usbg_tpg *tpg = fu->tpg; 1205 struct tcm_usbg_nexus *tv_nexus; 1206 u32 cmd_len; 1207 1208 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1209 pr_err("Wrong signature on CBW\n"); 1210 return -EINVAL; 1211 } 1212 if (len != 31) { 1213 pr_err("Wrong length for CBW\n"); 1214 return -EINVAL; 1215 } 1216 1217 cmd_len = cbw->Length; 1218 if (cmd_len < 1 || cmd_len > 16) 1219 return -EINVAL; 1220 1221 tv_nexus = tpg->tpg_nexus; 1222 if (!tv_nexus) { 1223 pr_err("Missing nexus, ignoring command\n"); 1224 return -ENODEV; 1225 } 1226 1227 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1228 if (IS_ERR(cmd)) { 1229 pr_err("usbg_get_cmd failed\n"); 1230 return -ENOMEM; 1231 } 1232 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1233 1234 cmd->bot_tag = cbw->Tag; 1235 cmd->prio_attr = TCM_SIMPLE_TAG; 1236 cmd->unpacked_lun = cbw->Lun; 1237 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1238 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1239 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1240 1241 INIT_WORK(&cmd->work, bot_cmd_work); 1242 queue_work(tpg->workqueue, &cmd->work); 1243 1244 return 0; 1245 } 1246 1247 /* Start fabric.c code */ 1248 1249 static int usbg_check_true(struct se_portal_group *se_tpg) 1250 { 1251 return 1; 1252 } 1253 1254 static int usbg_check_false(struct se_portal_group *se_tpg) 1255 { 1256 return 0; 1257 } 1258 1259 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1260 { 1261 struct usbg_tpg *tpg = container_of(se_tpg, 1262 struct usbg_tpg, se_tpg); 1263 struct usbg_tport *tport = tpg->tport; 1264 1265 return &tport->tport_name[0]; 1266 } 1267 1268 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1269 { 1270 struct usbg_tpg *tpg = container_of(se_tpg, 1271 struct usbg_tpg, se_tpg); 1272 return tpg->tport_tpgt; 1273 } 1274 1275 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg) 1276 { 1277 return 1; 1278 } 1279 1280 static void usbg_release_cmd(struct se_cmd *se_cmd) 1281 { 1282 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1283 se_cmd); 1284 struct se_session *se_sess = se_cmd->se_sess; 1285 1286 kfree(cmd->data_buf); 1287 target_free_tag(se_sess, se_cmd); 1288 } 1289 1290 static u32 usbg_sess_get_index(struct se_session *se_sess) 1291 { 1292 return 0; 1293 } 1294 1295 static void usbg_set_default_node_attrs(struct se_node_acl *nacl) 1296 { 1297 } 1298 1299 static int usbg_get_cmd_state(struct se_cmd *se_cmd) 1300 { 1301 return 0; 1302 } 1303 1304 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1305 { 1306 } 1307 1308 static void usbg_aborted_task(struct se_cmd *se_cmd) 1309 { 1310 } 1311 1312 static const char *usbg_check_wwn(const char *name) 1313 { 1314 const char *n; 1315 unsigned int len; 1316 1317 n = strstr(name, "naa."); 1318 if (!n) 1319 return NULL; 1320 n += 4; 1321 len = strlen(n); 1322 if (len == 0 || len > USBG_NAMELEN - 1) 1323 return NULL; 1324 return n; 1325 } 1326 1327 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1328 { 1329 if (!usbg_check_wwn(name)) 1330 return -EINVAL; 1331 return 0; 1332 } 1333 1334 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1335 const char *name) 1336 { 1337 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1338 tport_wwn); 1339 struct usbg_tpg *tpg; 1340 unsigned long tpgt; 1341 int ret; 1342 struct f_tcm_opts *opts; 1343 unsigned i; 1344 1345 if (strstr(name, "tpgt_") != name) 1346 return ERR_PTR(-EINVAL); 1347 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1348 return ERR_PTR(-EINVAL); 1349 ret = -ENODEV; 1350 mutex_lock(&tpg_instances_lock); 1351 for (i = 0; i < TPG_INSTANCES; ++i) 1352 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1353 break; 1354 if (i == TPG_INSTANCES) 1355 goto unlock_inst; 1356 1357 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1358 func_inst); 1359 mutex_lock(&opts->dep_lock); 1360 if (!opts->ready) 1361 goto unlock_dep; 1362 1363 if (opts->has_dep) { 1364 if (!try_module_get(opts->dependent)) 1365 goto unlock_dep; 1366 } else { 1367 ret = configfs_depend_item_unlocked( 1368 wwn->wwn_group.cg_subsys, 1369 &opts->func_inst.group.cg_item); 1370 if (ret) 1371 goto unlock_dep; 1372 } 1373 1374 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1375 ret = -ENOMEM; 1376 if (!tpg) 1377 goto unref_dep; 1378 mutex_init(&tpg->tpg_mutex); 1379 atomic_set(&tpg->tpg_port_count, 0); 1380 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1381 if (!tpg->workqueue) 1382 goto free_tpg; 1383 1384 tpg->tport = tport; 1385 tpg->tport_tpgt = tpgt; 1386 1387 /* 1388 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1389 * pretend to be SAS.. 1390 */ 1391 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1392 if (ret < 0) 1393 goto free_workqueue; 1394 1395 tpg_instances[i].tpg = tpg; 1396 tpg->fi = tpg_instances[i].func_inst; 1397 mutex_unlock(&opts->dep_lock); 1398 mutex_unlock(&tpg_instances_lock); 1399 return &tpg->se_tpg; 1400 1401 free_workqueue: 1402 destroy_workqueue(tpg->workqueue); 1403 free_tpg: 1404 kfree(tpg); 1405 unref_dep: 1406 if (opts->has_dep) 1407 module_put(opts->dependent); 1408 else 1409 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1410 unlock_dep: 1411 mutex_unlock(&opts->dep_lock); 1412 unlock_inst: 1413 mutex_unlock(&tpg_instances_lock); 1414 1415 return ERR_PTR(ret); 1416 } 1417 1418 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1419 1420 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1421 { 1422 struct usbg_tpg *tpg = container_of(se_tpg, 1423 struct usbg_tpg, se_tpg); 1424 unsigned i; 1425 struct f_tcm_opts *opts; 1426 1427 tcm_usbg_drop_nexus(tpg); 1428 core_tpg_deregister(se_tpg); 1429 destroy_workqueue(tpg->workqueue); 1430 1431 mutex_lock(&tpg_instances_lock); 1432 for (i = 0; i < TPG_INSTANCES; ++i) 1433 if (tpg_instances[i].tpg == tpg) 1434 break; 1435 if (i < TPG_INSTANCES) { 1436 tpg_instances[i].tpg = NULL; 1437 opts = container_of(tpg_instances[i].func_inst, 1438 struct f_tcm_opts, func_inst); 1439 mutex_lock(&opts->dep_lock); 1440 if (opts->has_dep) 1441 module_put(opts->dependent); 1442 else 1443 configfs_undepend_item_unlocked( 1444 &opts->func_inst.group.cg_item); 1445 mutex_unlock(&opts->dep_lock); 1446 } 1447 mutex_unlock(&tpg_instances_lock); 1448 1449 kfree(tpg); 1450 } 1451 1452 static struct se_wwn *usbg_make_tport( 1453 struct target_fabric_configfs *tf, 1454 struct config_group *group, 1455 const char *name) 1456 { 1457 struct usbg_tport *tport; 1458 const char *wnn_name; 1459 u64 wwpn = 0; 1460 1461 wnn_name = usbg_check_wwn(name); 1462 if (!wnn_name) 1463 return ERR_PTR(-EINVAL); 1464 1465 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1466 if (!(tport)) 1467 return ERR_PTR(-ENOMEM); 1468 1469 tport->tport_wwpn = wwpn; 1470 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1471 return &tport->tport_wwn; 1472 } 1473 1474 static void usbg_drop_tport(struct se_wwn *wwn) 1475 { 1476 struct usbg_tport *tport = container_of(wwn, 1477 struct usbg_tport, tport_wwn); 1478 kfree(tport); 1479 } 1480 1481 /* 1482 * If somebody feels like dropping the version property, go ahead. 1483 */ 1484 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1485 { 1486 return sprintf(page, "usb-gadget fabric module\n"); 1487 } 1488 1489 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1490 1491 static struct configfs_attribute *usbg_wwn_attrs[] = { 1492 &usbg_wwn_attr_version, 1493 NULL, 1494 }; 1495 1496 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page) 1497 { 1498 struct se_portal_group *se_tpg = to_tpg(item); 1499 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1500 1501 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect); 1502 } 1503 1504 static int usbg_attach(struct usbg_tpg *); 1505 static void usbg_detach(struct usbg_tpg *); 1506 1507 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item, 1508 const char *page, size_t count) 1509 { 1510 struct se_portal_group *se_tpg = to_tpg(item); 1511 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1512 bool op; 1513 ssize_t ret; 1514 1515 ret = strtobool(page, &op); 1516 if (ret) 1517 return ret; 1518 1519 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect)) 1520 return -EINVAL; 1521 1522 if (op) 1523 ret = usbg_attach(tpg); 1524 else 1525 usbg_detach(tpg); 1526 if (ret) 1527 return ret; 1528 1529 tpg->gadget_connect = op; 1530 1531 return count; 1532 } 1533 1534 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1535 { 1536 struct se_portal_group *se_tpg = to_tpg(item); 1537 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1538 struct tcm_usbg_nexus *tv_nexus; 1539 ssize_t ret; 1540 1541 mutex_lock(&tpg->tpg_mutex); 1542 tv_nexus = tpg->tpg_nexus; 1543 if (!tv_nexus) { 1544 ret = -ENODEV; 1545 goto out; 1546 } 1547 ret = snprintf(page, PAGE_SIZE, "%s\n", 1548 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1549 out: 1550 mutex_unlock(&tpg->tpg_mutex); 1551 return ret; 1552 } 1553 1554 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1555 struct se_session *se_sess, void *p) 1556 { 1557 struct usbg_tpg *tpg = container_of(se_tpg, 1558 struct usbg_tpg, se_tpg); 1559 1560 tpg->tpg_nexus = p; 1561 return 0; 1562 } 1563 1564 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1565 { 1566 struct tcm_usbg_nexus *tv_nexus; 1567 int ret = 0; 1568 1569 mutex_lock(&tpg->tpg_mutex); 1570 if (tpg->tpg_nexus) { 1571 ret = -EEXIST; 1572 pr_debug("tpg->tpg_nexus already exists\n"); 1573 goto out_unlock; 1574 } 1575 1576 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1577 if (!tv_nexus) { 1578 ret = -ENOMEM; 1579 goto out_unlock; 1580 } 1581 1582 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1583 USB_G_DEFAULT_SESSION_TAGS, 1584 sizeof(struct usbg_cmd), 1585 TARGET_PROT_NORMAL, name, 1586 tv_nexus, usbg_alloc_sess_cb); 1587 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1588 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1589 pr_debug(MAKE_NEXUS_MSG, name); 1590 #undef MAKE_NEXUS_MSG 1591 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1592 kfree(tv_nexus); 1593 } 1594 1595 out_unlock: 1596 mutex_unlock(&tpg->tpg_mutex); 1597 return ret; 1598 } 1599 1600 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1601 { 1602 struct se_session *se_sess; 1603 struct tcm_usbg_nexus *tv_nexus; 1604 int ret = -ENODEV; 1605 1606 mutex_lock(&tpg->tpg_mutex); 1607 tv_nexus = tpg->tpg_nexus; 1608 if (!tv_nexus) 1609 goto out; 1610 1611 se_sess = tv_nexus->tvn_se_sess; 1612 if (!se_sess) 1613 goto out; 1614 1615 if (atomic_read(&tpg->tpg_port_count)) { 1616 ret = -EPERM; 1617 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1618 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1619 #undef MSG 1620 goto out; 1621 } 1622 1623 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1624 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1625 /* 1626 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1627 */ 1628 target_remove_session(se_sess); 1629 tpg->tpg_nexus = NULL; 1630 1631 kfree(tv_nexus); 1632 ret = 0; 1633 out: 1634 mutex_unlock(&tpg->tpg_mutex); 1635 return ret; 1636 } 1637 1638 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1639 const char *page, size_t count) 1640 { 1641 struct se_portal_group *se_tpg = to_tpg(item); 1642 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1643 unsigned char i_port[USBG_NAMELEN], *ptr; 1644 int ret; 1645 1646 if (!strncmp(page, "NULL", 4)) { 1647 ret = tcm_usbg_drop_nexus(tpg); 1648 return (!ret) ? count : ret; 1649 } 1650 if (strlen(page) >= USBG_NAMELEN) { 1651 1652 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1653 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1654 #undef NEXUS_STORE_MSG 1655 return -EINVAL; 1656 } 1657 snprintf(i_port, USBG_NAMELEN, "%s", page); 1658 1659 ptr = strstr(i_port, "naa."); 1660 if (!ptr) { 1661 pr_err("Missing 'naa.' prefix\n"); 1662 return -EINVAL; 1663 } 1664 1665 if (i_port[strlen(i_port) - 1] == '\n') 1666 i_port[strlen(i_port) - 1] = '\0'; 1667 1668 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1669 if (ret < 0) 1670 return ret; 1671 return count; 1672 } 1673 1674 CONFIGFS_ATTR(tcm_usbg_tpg_, enable); 1675 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1676 1677 static struct configfs_attribute *usbg_base_attrs[] = { 1678 &tcm_usbg_tpg_attr_enable, 1679 &tcm_usbg_tpg_attr_nexus, 1680 NULL, 1681 }; 1682 1683 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1684 { 1685 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1686 1687 atomic_inc(&tpg->tpg_port_count); 1688 smp_mb__after_atomic(); 1689 return 0; 1690 } 1691 1692 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1693 struct se_lun *se_lun) 1694 { 1695 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1696 1697 atomic_dec(&tpg->tpg_port_count); 1698 smp_mb__after_atomic(); 1699 } 1700 1701 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1702 { 1703 return target_put_sess_cmd(se_cmd); 1704 } 1705 1706 static const struct target_core_fabric_ops usbg_ops = { 1707 .module = THIS_MODULE, 1708 .fabric_name = "usb_gadget", 1709 .tpg_get_wwn = usbg_get_fabric_wwn, 1710 .tpg_get_tag = usbg_get_tag, 1711 .tpg_check_demo_mode = usbg_check_true, 1712 .tpg_check_demo_mode_cache = usbg_check_false, 1713 .tpg_check_demo_mode_write_protect = usbg_check_false, 1714 .tpg_check_prod_mode_write_protect = usbg_check_false, 1715 .tpg_get_inst_index = usbg_tpg_get_inst_index, 1716 .release_cmd = usbg_release_cmd, 1717 .sess_get_index = usbg_sess_get_index, 1718 .sess_get_initiator_sid = NULL, 1719 .write_pending = usbg_send_write_request, 1720 .set_default_node_attributes = usbg_set_default_node_attrs, 1721 .get_cmd_state = usbg_get_cmd_state, 1722 .queue_data_in = usbg_send_read_response, 1723 .queue_status = usbg_send_status_response, 1724 .queue_tm_rsp = usbg_queue_tm_rsp, 1725 .aborted_task = usbg_aborted_task, 1726 .check_stop_free = usbg_check_stop_free, 1727 1728 .fabric_make_wwn = usbg_make_tport, 1729 .fabric_drop_wwn = usbg_drop_tport, 1730 .fabric_make_tpg = usbg_make_tpg, 1731 .fabric_drop_tpg = usbg_drop_tpg, 1732 .fabric_post_link = usbg_port_link, 1733 .fabric_pre_unlink = usbg_port_unlink, 1734 .fabric_init_nodeacl = usbg_init_nodeacl, 1735 1736 .tfc_wwn_attrs = usbg_wwn_attrs, 1737 .tfc_tpg_base_attrs = usbg_base_attrs, 1738 }; 1739 1740 /* Start gadget.c code */ 1741 1742 static struct usb_interface_descriptor bot_intf_desc = { 1743 .bLength = sizeof(bot_intf_desc), 1744 .bDescriptorType = USB_DT_INTERFACE, 1745 .bNumEndpoints = 2, 1746 .bAlternateSetting = USB_G_ALT_INT_BBB, 1747 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1748 .bInterfaceSubClass = USB_SC_SCSI, 1749 .bInterfaceProtocol = USB_PR_BULK, 1750 }; 1751 1752 static struct usb_interface_descriptor uasp_intf_desc = { 1753 .bLength = sizeof(uasp_intf_desc), 1754 .bDescriptorType = USB_DT_INTERFACE, 1755 .bNumEndpoints = 4, 1756 .bAlternateSetting = USB_G_ALT_INT_UAS, 1757 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1758 .bInterfaceSubClass = USB_SC_SCSI, 1759 .bInterfaceProtocol = USB_PR_UAS, 1760 }; 1761 1762 static struct usb_endpoint_descriptor uasp_bi_desc = { 1763 .bLength = USB_DT_ENDPOINT_SIZE, 1764 .bDescriptorType = USB_DT_ENDPOINT, 1765 .bEndpointAddress = USB_DIR_IN, 1766 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1767 .wMaxPacketSize = cpu_to_le16(512), 1768 }; 1769 1770 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1771 .bLength = USB_DT_ENDPOINT_SIZE, 1772 .bDescriptorType = USB_DT_ENDPOINT, 1773 .bEndpointAddress = USB_DIR_IN, 1774 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1775 }; 1776 1777 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1778 .bLength = sizeof(uasp_bi_pipe_desc), 1779 .bDescriptorType = USB_DT_PIPE_USAGE, 1780 .bPipeID = DATA_IN_PIPE_ID, 1781 }; 1782 1783 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1784 .bLength = USB_DT_ENDPOINT_SIZE, 1785 .bDescriptorType = USB_DT_ENDPOINT, 1786 .bEndpointAddress = USB_DIR_IN, 1787 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1788 .wMaxPacketSize = cpu_to_le16(1024), 1789 }; 1790 1791 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1792 .bLength = sizeof(uasp_bi_ep_comp_desc), 1793 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1794 .bMaxBurst = 0, 1795 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1796 .wBytesPerInterval = 0, 1797 }; 1798 1799 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1800 .bLength = sizeof(bot_bi_ep_comp_desc), 1801 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1802 .bMaxBurst = 0, 1803 }; 1804 1805 static struct usb_endpoint_descriptor uasp_bo_desc = { 1806 .bLength = USB_DT_ENDPOINT_SIZE, 1807 .bDescriptorType = USB_DT_ENDPOINT, 1808 .bEndpointAddress = USB_DIR_OUT, 1809 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1810 .wMaxPacketSize = cpu_to_le16(512), 1811 }; 1812 1813 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1814 .bLength = USB_DT_ENDPOINT_SIZE, 1815 .bDescriptorType = USB_DT_ENDPOINT, 1816 .bEndpointAddress = USB_DIR_OUT, 1817 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1818 }; 1819 1820 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1821 .bLength = sizeof(uasp_bo_pipe_desc), 1822 .bDescriptorType = USB_DT_PIPE_USAGE, 1823 .bPipeID = DATA_OUT_PIPE_ID, 1824 }; 1825 1826 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1827 .bLength = USB_DT_ENDPOINT_SIZE, 1828 .bDescriptorType = USB_DT_ENDPOINT, 1829 .bEndpointAddress = USB_DIR_OUT, 1830 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1831 .wMaxPacketSize = cpu_to_le16(0x400), 1832 }; 1833 1834 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1835 .bLength = sizeof(uasp_bo_ep_comp_desc), 1836 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1837 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1838 }; 1839 1840 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1841 .bLength = sizeof(bot_bo_ep_comp_desc), 1842 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1843 }; 1844 1845 static struct usb_endpoint_descriptor uasp_status_desc = { 1846 .bLength = USB_DT_ENDPOINT_SIZE, 1847 .bDescriptorType = USB_DT_ENDPOINT, 1848 .bEndpointAddress = USB_DIR_IN, 1849 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1850 .wMaxPacketSize = cpu_to_le16(512), 1851 }; 1852 1853 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1854 .bLength = USB_DT_ENDPOINT_SIZE, 1855 .bDescriptorType = USB_DT_ENDPOINT, 1856 .bEndpointAddress = USB_DIR_IN, 1857 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1858 }; 1859 1860 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1861 .bLength = sizeof(uasp_status_pipe_desc), 1862 .bDescriptorType = USB_DT_PIPE_USAGE, 1863 .bPipeID = STATUS_PIPE_ID, 1864 }; 1865 1866 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1867 .bLength = USB_DT_ENDPOINT_SIZE, 1868 .bDescriptorType = USB_DT_ENDPOINT, 1869 .bEndpointAddress = USB_DIR_IN, 1870 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1871 .wMaxPacketSize = cpu_to_le16(1024), 1872 }; 1873 1874 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1875 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1876 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1877 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1878 }; 1879 1880 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1881 .bLength = USB_DT_ENDPOINT_SIZE, 1882 .bDescriptorType = USB_DT_ENDPOINT, 1883 .bEndpointAddress = USB_DIR_OUT, 1884 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1885 .wMaxPacketSize = cpu_to_le16(512), 1886 }; 1887 1888 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1889 .bLength = USB_DT_ENDPOINT_SIZE, 1890 .bDescriptorType = USB_DT_ENDPOINT, 1891 .bEndpointAddress = USB_DIR_OUT, 1892 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1893 }; 1894 1895 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1896 .bLength = sizeof(uasp_cmd_pipe_desc), 1897 .bDescriptorType = USB_DT_PIPE_USAGE, 1898 .bPipeID = CMD_PIPE_ID, 1899 }; 1900 1901 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1902 .bLength = USB_DT_ENDPOINT_SIZE, 1903 .bDescriptorType = USB_DT_ENDPOINT, 1904 .bEndpointAddress = USB_DIR_OUT, 1905 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1906 .wMaxPacketSize = cpu_to_le16(1024), 1907 }; 1908 1909 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1910 .bLength = sizeof(uasp_cmd_comp_desc), 1911 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1912 }; 1913 1914 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1915 (struct usb_descriptor_header *) &bot_intf_desc, 1916 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1917 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1918 1919 (struct usb_descriptor_header *) &uasp_intf_desc, 1920 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1921 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1922 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1923 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1924 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1925 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1926 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1927 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1928 NULL, 1929 }; 1930 1931 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1932 (struct usb_descriptor_header *) &bot_intf_desc, 1933 (struct usb_descriptor_header *) &uasp_bi_desc, 1934 (struct usb_descriptor_header *) &uasp_bo_desc, 1935 1936 (struct usb_descriptor_header *) &uasp_intf_desc, 1937 (struct usb_descriptor_header *) &uasp_bi_desc, 1938 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1939 (struct usb_descriptor_header *) &uasp_bo_desc, 1940 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1941 (struct usb_descriptor_header *) &uasp_status_desc, 1942 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1943 (struct usb_descriptor_header *) &uasp_cmd_desc, 1944 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1945 NULL, 1946 }; 1947 1948 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1949 (struct usb_descriptor_header *) &bot_intf_desc, 1950 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1951 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1952 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1953 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1954 1955 (struct usb_descriptor_header *) &uasp_intf_desc, 1956 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1957 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1958 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1959 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1960 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1961 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1962 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1963 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1964 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1965 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1966 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1967 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1968 NULL, 1969 }; 1970 1971 static struct usb_string tcm_us_strings[] = { 1972 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1973 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1974 { }, 1975 }; 1976 1977 static struct usb_gadget_strings tcm_stringtab = { 1978 .language = 0x0409, 1979 .strings = tcm_us_strings, 1980 }; 1981 1982 static struct usb_gadget_strings *tcm_strings[] = { 1983 &tcm_stringtab, 1984 NULL, 1985 }; 1986 1987 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1988 { 1989 struct f_uas *fu = to_f_uas(f); 1990 struct usb_string *us; 1991 struct usb_gadget *gadget = c->cdev->gadget; 1992 struct usb_ep *ep; 1993 struct f_tcm_opts *opts; 1994 int iface; 1995 int ret; 1996 1997 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1998 1999 mutex_lock(&opts->dep_lock); 2000 if (!opts->can_attach) { 2001 mutex_unlock(&opts->dep_lock); 2002 return -ENODEV; 2003 } 2004 mutex_unlock(&opts->dep_lock); 2005 us = usb_gstrings_attach(c->cdev, tcm_strings, 2006 ARRAY_SIZE(tcm_us_strings)); 2007 if (IS_ERR(us)) 2008 return PTR_ERR(us); 2009 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 2010 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 2011 2012 iface = usb_interface_id(c, f); 2013 if (iface < 0) 2014 return iface; 2015 2016 bot_intf_desc.bInterfaceNumber = iface; 2017 uasp_intf_desc.bInterfaceNumber = iface; 2018 fu->iface = iface; 2019 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 2020 &uasp_bi_ep_comp_desc); 2021 if (!ep) 2022 goto ep_fail; 2023 2024 fu->ep_in = ep; 2025 2026 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 2027 &uasp_bo_ep_comp_desc); 2028 if (!ep) 2029 goto ep_fail; 2030 fu->ep_out = ep; 2031 2032 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 2033 &uasp_status_in_ep_comp_desc); 2034 if (!ep) 2035 goto ep_fail; 2036 fu->ep_status = ep; 2037 2038 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 2039 &uasp_cmd_comp_desc); 2040 if (!ep) 2041 goto ep_fail; 2042 fu->ep_cmd = ep; 2043 2044 /* Assume endpoint addresses are the same for both speeds */ 2045 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2046 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2047 uasp_status_desc.bEndpointAddress = 2048 uasp_ss_status_desc.bEndpointAddress; 2049 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2050 2051 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2052 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2053 uasp_fs_status_desc.bEndpointAddress = 2054 uasp_ss_status_desc.bEndpointAddress; 2055 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2056 2057 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2058 uasp_hs_function_desc, uasp_ss_function_desc, NULL); 2059 if (ret) 2060 goto ep_fail; 2061 2062 return 0; 2063 ep_fail: 2064 pr_err("Can't claim all required eps\n"); 2065 2066 return -ENOTSUPP; 2067 } 2068 2069 struct guas_setup_wq { 2070 struct work_struct work; 2071 struct f_uas *fu; 2072 unsigned int alt; 2073 }; 2074 2075 static void tcm_delayed_set_alt(struct work_struct *wq) 2076 { 2077 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2078 work); 2079 struct f_uas *fu = work->fu; 2080 int alt = work->alt; 2081 2082 kfree(work); 2083 2084 if (fu->flags & USBG_IS_BOT) 2085 bot_cleanup_old_alt(fu); 2086 if (fu->flags & USBG_IS_UAS) 2087 uasp_cleanup_old_alt(fu); 2088 2089 if (alt == USB_G_ALT_INT_BBB) 2090 bot_set_alt(fu); 2091 else if (alt == USB_G_ALT_INT_UAS) 2092 uasp_set_alt(fu); 2093 usb_composite_setup_continue(fu->function.config->cdev); 2094 } 2095 2096 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2097 { 2098 if (intf == bot_intf_desc.bInterfaceNumber) 2099 return USB_G_ALT_INT_BBB; 2100 if (intf == uasp_intf_desc.bInterfaceNumber) 2101 return USB_G_ALT_INT_UAS; 2102 2103 return -EOPNOTSUPP; 2104 } 2105 2106 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2107 { 2108 struct f_uas *fu = to_f_uas(f); 2109 2110 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2111 struct guas_setup_wq *work; 2112 2113 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2114 if (!work) 2115 return -ENOMEM; 2116 INIT_WORK(&work->work, tcm_delayed_set_alt); 2117 work->fu = fu; 2118 work->alt = alt; 2119 schedule_work(&work->work); 2120 return USB_GADGET_DELAYED_STATUS; 2121 } 2122 return -EOPNOTSUPP; 2123 } 2124 2125 static void tcm_disable(struct usb_function *f) 2126 { 2127 struct f_uas *fu = to_f_uas(f); 2128 2129 if (fu->flags & USBG_IS_UAS) 2130 uasp_cleanup_old_alt(fu); 2131 else if (fu->flags & USBG_IS_BOT) 2132 bot_cleanup_old_alt(fu); 2133 fu->flags = 0; 2134 } 2135 2136 static int tcm_setup(struct usb_function *f, 2137 const struct usb_ctrlrequest *ctrl) 2138 { 2139 struct f_uas *fu = to_f_uas(f); 2140 2141 if (!(fu->flags & USBG_IS_BOT)) 2142 return -EOPNOTSUPP; 2143 2144 return usbg_bot_setup(f, ctrl); 2145 } 2146 2147 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2148 { 2149 return container_of(to_config_group(item), struct f_tcm_opts, 2150 func_inst.group); 2151 } 2152 2153 static void tcm_attr_release(struct config_item *item) 2154 { 2155 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2156 2157 usb_put_function_instance(&opts->func_inst); 2158 } 2159 2160 static struct configfs_item_operations tcm_item_ops = { 2161 .release = tcm_attr_release, 2162 }; 2163 2164 static const struct config_item_type tcm_func_type = { 2165 .ct_item_ops = &tcm_item_ops, 2166 .ct_owner = THIS_MODULE, 2167 }; 2168 2169 static void tcm_free_inst(struct usb_function_instance *f) 2170 { 2171 struct f_tcm_opts *opts; 2172 unsigned i; 2173 2174 opts = container_of(f, struct f_tcm_opts, func_inst); 2175 2176 mutex_lock(&tpg_instances_lock); 2177 for (i = 0; i < TPG_INSTANCES; ++i) 2178 if (tpg_instances[i].func_inst == f) 2179 break; 2180 if (i < TPG_INSTANCES) 2181 tpg_instances[i].func_inst = NULL; 2182 mutex_unlock(&tpg_instances_lock); 2183 2184 kfree(opts); 2185 } 2186 2187 static int tcm_register_callback(struct usb_function_instance *f) 2188 { 2189 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2190 2191 mutex_lock(&opts->dep_lock); 2192 opts->can_attach = true; 2193 mutex_unlock(&opts->dep_lock); 2194 2195 return 0; 2196 } 2197 2198 static void tcm_unregister_callback(struct usb_function_instance *f) 2199 { 2200 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2201 2202 mutex_lock(&opts->dep_lock); 2203 unregister_gadget_item(opts-> 2204 func_inst.group.cg_item.ci_parent->ci_parent); 2205 opts->can_attach = false; 2206 mutex_unlock(&opts->dep_lock); 2207 } 2208 2209 static int usbg_attach(struct usbg_tpg *tpg) 2210 { 2211 struct usb_function_instance *f = tpg->fi; 2212 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2213 2214 if (opts->tcm_register_callback) 2215 return opts->tcm_register_callback(f); 2216 2217 return 0; 2218 } 2219 2220 static void usbg_detach(struct usbg_tpg *tpg) 2221 { 2222 struct usb_function_instance *f = tpg->fi; 2223 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2224 2225 if (opts->tcm_unregister_callback) 2226 opts->tcm_unregister_callback(f); 2227 } 2228 2229 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2230 { 2231 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2232 2233 pr_debug("tcm: Activating %s\n", name); 2234 2235 mutex_lock(&opts->dep_lock); 2236 opts->ready = true; 2237 mutex_unlock(&opts->dep_lock); 2238 2239 return 0; 2240 } 2241 2242 static struct usb_function_instance *tcm_alloc_inst(void) 2243 { 2244 struct f_tcm_opts *opts; 2245 int i; 2246 2247 2248 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2249 if (!opts) 2250 return ERR_PTR(-ENOMEM); 2251 2252 mutex_lock(&tpg_instances_lock); 2253 for (i = 0; i < TPG_INSTANCES; ++i) 2254 if (!tpg_instances[i].func_inst) 2255 break; 2256 2257 if (i == TPG_INSTANCES) { 2258 mutex_unlock(&tpg_instances_lock); 2259 kfree(opts); 2260 return ERR_PTR(-EBUSY); 2261 } 2262 tpg_instances[i].func_inst = &opts->func_inst; 2263 mutex_unlock(&tpg_instances_lock); 2264 2265 mutex_init(&opts->dep_lock); 2266 opts->func_inst.set_inst_name = tcm_set_name; 2267 opts->func_inst.free_func_inst = tcm_free_inst; 2268 opts->tcm_register_callback = tcm_register_callback; 2269 opts->tcm_unregister_callback = tcm_unregister_callback; 2270 2271 config_group_init_type_name(&opts->func_inst.group, "", 2272 &tcm_func_type); 2273 2274 return &opts->func_inst; 2275 } 2276 2277 static void tcm_free(struct usb_function *f) 2278 { 2279 struct f_uas *tcm = to_f_uas(f); 2280 2281 kfree(tcm); 2282 } 2283 2284 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2285 { 2286 usb_free_all_descriptors(f); 2287 } 2288 2289 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2290 { 2291 struct f_uas *fu; 2292 unsigned i; 2293 2294 mutex_lock(&tpg_instances_lock); 2295 for (i = 0; i < TPG_INSTANCES; ++i) 2296 if (tpg_instances[i].func_inst == fi) 2297 break; 2298 if (i == TPG_INSTANCES) { 2299 mutex_unlock(&tpg_instances_lock); 2300 return ERR_PTR(-ENODEV); 2301 } 2302 2303 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2304 if (!fu) { 2305 mutex_unlock(&tpg_instances_lock); 2306 return ERR_PTR(-ENOMEM); 2307 } 2308 2309 fu->function.name = "Target Function"; 2310 fu->function.bind = tcm_bind; 2311 fu->function.unbind = tcm_unbind; 2312 fu->function.set_alt = tcm_set_alt; 2313 fu->function.get_alt = tcm_get_alt; 2314 fu->function.setup = tcm_setup; 2315 fu->function.disable = tcm_disable; 2316 fu->function.free_func = tcm_free; 2317 fu->tpg = tpg_instances[i].tpg; 2318 mutex_unlock(&tpg_instances_lock); 2319 2320 return &fu->function; 2321 } 2322 2323 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2324 2325 static int tcm_init(void) 2326 { 2327 int ret; 2328 2329 ret = usb_function_register(&tcmusb_func); 2330 if (ret) 2331 return ret; 2332 2333 ret = target_register_template(&usbg_ops); 2334 if (ret) 2335 usb_function_unregister(&tcmusb_func); 2336 2337 return ret; 2338 } 2339 module_init(tcm_init); 2340 2341 static void tcm_exit(void) 2342 { 2343 target_unregister_template(&usbg_ops); 2344 usb_function_unregister(&tcmusb_func); 2345 } 2346 module_exit(tcm_exit); 2347 2348 MODULE_LICENSE("GPL"); 2349 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2350