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->is_last = 1; 535 stream->req_in->complete = uasp_status_data_cmpl; 536 stream->req_in->length = se_cmd->data_length; 537 stream->req_in->context = cmd; 538 539 cmd->state = UASP_SEND_STATUS; 540 return 0; 541 } 542 543 static void uasp_prepare_status(struct usbg_cmd *cmd) 544 { 545 struct se_cmd *se_cmd = &cmd->se_cmd; 546 struct sense_iu *iu = &cmd->sense_iu; 547 struct uas_stream *stream = cmd->stream; 548 549 cmd->state = UASP_QUEUE_COMMAND; 550 iu->iu_id = IU_ID_STATUS; 551 iu->tag = cpu_to_be16(cmd->tag); 552 553 /* 554 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 555 */ 556 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 557 iu->status = se_cmd->scsi_status; 558 stream->req_status->is_last = 1; 559 stream->req_status->context = cmd; 560 stream->req_status->length = se_cmd->scsi_sense_length + 16; 561 stream->req_status->buf = iu; 562 stream->req_status->complete = uasp_status_data_cmpl; 563 } 564 565 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 566 { 567 struct usbg_cmd *cmd = req->context; 568 struct uas_stream *stream = cmd->stream; 569 struct f_uas *fu = cmd->fu; 570 int ret; 571 572 if (req->status < 0) 573 goto cleanup; 574 575 switch (cmd->state) { 576 case UASP_SEND_DATA: 577 ret = uasp_prepare_r_request(cmd); 578 if (ret) 579 goto cleanup; 580 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 581 if (ret) 582 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 583 break; 584 585 case UASP_RECEIVE_DATA: 586 ret = usbg_prepare_w_request(cmd, stream->req_out); 587 if (ret) 588 goto cleanup; 589 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 590 if (ret) 591 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 592 break; 593 594 case UASP_SEND_STATUS: 595 uasp_prepare_status(cmd); 596 ret = usb_ep_queue(fu->ep_status, stream->req_status, 597 GFP_ATOMIC); 598 if (ret) 599 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 600 break; 601 602 case UASP_QUEUE_COMMAND: 603 transport_generic_free_cmd(&cmd->se_cmd, 0); 604 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 605 break; 606 607 default: 608 BUG(); 609 } 610 return; 611 612 cleanup: 613 transport_generic_free_cmd(&cmd->se_cmd, 0); 614 } 615 616 static int uasp_send_status_response(struct usbg_cmd *cmd) 617 { 618 struct f_uas *fu = cmd->fu; 619 struct uas_stream *stream = cmd->stream; 620 struct sense_iu *iu = &cmd->sense_iu; 621 622 iu->tag = cpu_to_be16(cmd->tag); 623 stream->req_status->complete = uasp_status_data_cmpl; 624 stream->req_status->context = cmd; 625 cmd->fu = fu; 626 uasp_prepare_status(cmd); 627 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 628 } 629 630 static int uasp_send_read_response(struct usbg_cmd *cmd) 631 { 632 struct f_uas *fu = cmd->fu; 633 struct uas_stream *stream = cmd->stream; 634 struct sense_iu *iu = &cmd->sense_iu; 635 int ret; 636 637 cmd->fu = fu; 638 639 iu->tag = cpu_to_be16(cmd->tag); 640 if (fu->flags & USBG_USE_STREAMS) { 641 642 ret = uasp_prepare_r_request(cmd); 643 if (ret) 644 goto out; 645 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 646 if (ret) { 647 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 648 kfree(cmd->data_buf); 649 cmd->data_buf = NULL; 650 } 651 652 } else { 653 654 iu->iu_id = IU_ID_READ_READY; 655 iu->tag = cpu_to_be16(cmd->tag); 656 657 stream->req_status->complete = uasp_status_data_cmpl; 658 stream->req_status->context = cmd; 659 660 cmd->state = UASP_SEND_DATA; 661 stream->req_status->buf = iu; 662 stream->req_status->length = sizeof(struct iu); 663 664 ret = usb_ep_queue(fu->ep_status, stream->req_status, 665 GFP_ATOMIC); 666 if (ret) 667 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 668 } 669 out: 670 return ret; 671 } 672 673 static int uasp_send_write_request(struct usbg_cmd *cmd) 674 { 675 struct f_uas *fu = cmd->fu; 676 struct se_cmd *se_cmd = &cmd->se_cmd; 677 struct uas_stream *stream = cmd->stream; 678 struct sense_iu *iu = &cmd->sense_iu; 679 int ret; 680 681 init_completion(&cmd->write_complete); 682 cmd->fu = fu; 683 684 iu->tag = cpu_to_be16(cmd->tag); 685 686 if (fu->flags & USBG_USE_STREAMS) { 687 688 ret = usbg_prepare_w_request(cmd, stream->req_out); 689 if (ret) 690 goto cleanup; 691 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 692 if (ret) 693 pr_err("%s(%d)\n", __func__, __LINE__); 694 695 } else { 696 697 iu->iu_id = IU_ID_WRITE_READY; 698 iu->tag = cpu_to_be16(cmd->tag); 699 700 stream->req_status->complete = uasp_status_data_cmpl; 701 stream->req_status->context = cmd; 702 703 cmd->state = UASP_RECEIVE_DATA; 704 stream->req_status->buf = iu; 705 stream->req_status->length = sizeof(struct iu); 706 707 ret = usb_ep_queue(fu->ep_status, stream->req_status, 708 GFP_ATOMIC); 709 if (ret) 710 pr_err("%s(%d)\n", __func__, __LINE__); 711 } 712 713 wait_for_completion(&cmd->write_complete); 714 target_execute_cmd(se_cmd); 715 cleanup: 716 return ret; 717 } 718 719 static int usbg_submit_command(struct f_uas *, void *, unsigned int); 720 721 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 722 { 723 struct f_uas *fu = req->context; 724 int ret; 725 726 if (req->status < 0) 727 return; 728 729 ret = usbg_submit_command(fu, req->buf, req->actual); 730 /* 731 * Once we tune for performance enqueue the command req here again so 732 * we can receive a second command while we processing this one. Pay 733 * attention to properly sync STAUS endpoint with DATA IN + OUT so you 734 * don't break HS. 735 */ 736 if (!ret) 737 return; 738 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 739 } 740 741 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 742 { 743 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 744 if (!stream->req_in) 745 goto out; 746 747 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 748 if (!stream->req_out) 749 goto err_out; 750 751 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 752 if (!stream->req_status) 753 goto err_sts; 754 755 return 0; 756 err_sts: 757 usb_ep_free_request(fu->ep_status, stream->req_status); 758 stream->req_status = NULL; 759 err_out: 760 usb_ep_free_request(fu->ep_out, stream->req_out); 761 stream->req_out = NULL; 762 out: 763 return -ENOMEM; 764 } 765 766 static int uasp_alloc_cmd(struct f_uas *fu) 767 { 768 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 769 if (!fu->cmd.req) 770 goto err; 771 772 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 773 if (!fu->cmd.buf) 774 goto err_buf; 775 776 fu->cmd.req->complete = uasp_cmd_complete; 777 fu->cmd.req->buf = fu->cmd.buf; 778 fu->cmd.req->length = fu->ep_cmd->maxpacket; 779 fu->cmd.req->context = fu; 780 return 0; 781 782 err_buf: 783 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 784 err: 785 return -ENOMEM; 786 } 787 788 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams) 789 { 790 int i; 791 792 for (i = 0; i < max_streams; i++) { 793 struct uas_stream *s = &fu->stream[i]; 794 795 s->req_in->stream_id = i + 1; 796 s->req_out->stream_id = i + 1; 797 s->req_status->stream_id = i + 1; 798 } 799 } 800 801 static int uasp_prepare_reqs(struct f_uas *fu) 802 { 803 int ret; 804 int i; 805 int max_streams; 806 807 if (fu->flags & USBG_USE_STREAMS) 808 max_streams = UASP_SS_EP_COMP_NUM_STREAMS; 809 else 810 max_streams = 1; 811 812 for (i = 0; i < max_streams; i++) { 813 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 814 if (ret) 815 goto err_cleanup; 816 } 817 818 ret = uasp_alloc_cmd(fu); 819 if (ret) 820 goto err_free_stream; 821 uasp_setup_stream_res(fu, max_streams); 822 823 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 824 if (ret) 825 goto err_free_stream; 826 827 return 0; 828 829 err_free_stream: 830 uasp_free_cmdreq(fu); 831 832 err_cleanup: 833 if (i) { 834 do { 835 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 836 i--; 837 } while (i); 838 } 839 pr_err("UASP: endpoint setup failed\n"); 840 return ret; 841 } 842 843 static void uasp_set_alt(struct f_uas *fu) 844 { 845 struct usb_function *f = &fu->function; 846 struct usb_gadget *gadget = f->config->cdev->gadget; 847 int ret; 848 849 fu->flags = USBG_IS_UAS; 850 851 if (gadget->speed >= USB_SPEED_SUPER) 852 fu->flags |= USBG_USE_STREAMS; 853 854 config_ep_by_speed(gadget, f, fu->ep_in); 855 ret = usb_ep_enable(fu->ep_in); 856 if (ret) 857 goto err_b_in; 858 859 config_ep_by_speed(gadget, f, fu->ep_out); 860 ret = usb_ep_enable(fu->ep_out); 861 if (ret) 862 goto err_b_out; 863 864 config_ep_by_speed(gadget, f, fu->ep_cmd); 865 ret = usb_ep_enable(fu->ep_cmd); 866 if (ret) 867 goto err_cmd; 868 config_ep_by_speed(gadget, f, fu->ep_status); 869 ret = usb_ep_enable(fu->ep_status); 870 if (ret) 871 goto err_status; 872 873 ret = uasp_prepare_reqs(fu); 874 if (ret) 875 goto err_wq; 876 fu->flags |= USBG_ENABLED; 877 878 pr_info("Using the UAS protocol\n"); 879 return; 880 err_wq: 881 usb_ep_disable(fu->ep_status); 882 err_status: 883 usb_ep_disable(fu->ep_cmd); 884 err_cmd: 885 usb_ep_disable(fu->ep_out); 886 err_b_out: 887 usb_ep_disable(fu->ep_in); 888 err_b_in: 889 fu->flags = 0; 890 } 891 892 static int get_cmd_dir(const unsigned char *cdb) 893 { 894 int ret; 895 896 switch (cdb[0]) { 897 case READ_6: 898 case READ_10: 899 case READ_12: 900 case READ_16: 901 case INQUIRY: 902 case MODE_SENSE: 903 case MODE_SENSE_10: 904 case SERVICE_ACTION_IN_16: 905 case MAINTENANCE_IN: 906 case PERSISTENT_RESERVE_IN: 907 case SECURITY_PROTOCOL_IN: 908 case ACCESS_CONTROL_IN: 909 case REPORT_LUNS: 910 case READ_BLOCK_LIMITS: 911 case READ_POSITION: 912 case READ_CAPACITY: 913 case READ_TOC: 914 case READ_FORMAT_CAPACITIES: 915 case REQUEST_SENSE: 916 ret = DMA_FROM_DEVICE; 917 break; 918 919 case WRITE_6: 920 case WRITE_10: 921 case WRITE_12: 922 case WRITE_16: 923 case MODE_SELECT: 924 case MODE_SELECT_10: 925 case WRITE_VERIFY: 926 case WRITE_VERIFY_12: 927 case PERSISTENT_RESERVE_OUT: 928 case MAINTENANCE_OUT: 929 case SECURITY_PROTOCOL_OUT: 930 case ACCESS_CONTROL_OUT: 931 ret = DMA_TO_DEVICE; 932 break; 933 case ALLOW_MEDIUM_REMOVAL: 934 case TEST_UNIT_READY: 935 case SYNCHRONIZE_CACHE: 936 case START_STOP: 937 case ERASE: 938 case REZERO_UNIT: 939 case SEEK_10: 940 case SPACE: 941 case VERIFY: 942 case WRITE_FILEMARKS: 943 ret = DMA_NONE; 944 break; 945 default: 946 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 947 pr_warn(CMD_DIR_MSG, cdb[0]); 948 #undef CMD_DIR_MSG 949 ret = -EINVAL; 950 } 951 return ret; 952 } 953 954 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 955 { 956 struct usbg_cmd *cmd = req->context; 957 struct se_cmd *se_cmd = &cmd->se_cmd; 958 959 if (req->status < 0) { 960 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 961 goto cleanup; 962 } 963 964 if (req->num_sgs == 0) { 965 sg_copy_from_buffer(se_cmd->t_data_sg, 966 se_cmd->t_data_nents, 967 cmd->data_buf, 968 se_cmd->data_length); 969 } 970 971 complete(&cmd->write_complete); 972 return; 973 974 cleanup: 975 transport_generic_free_cmd(&cmd->se_cmd, 0); 976 } 977 978 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 979 { 980 struct se_cmd *se_cmd = &cmd->se_cmd; 981 struct f_uas *fu = cmd->fu; 982 struct usb_gadget *gadget = fuas_to_gadget(fu); 983 984 if (!gadget->sg_supported) { 985 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 986 if (!cmd->data_buf) 987 return -ENOMEM; 988 989 req->buf = cmd->data_buf; 990 } else { 991 req->buf = NULL; 992 req->num_sgs = se_cmd->t_data_nents; 993 req->sg = se_cmd->t_data_sg; 994 } 995 996 req->is_last = 1; 997 req->complete = usbg_data_write_cmpl; 998 req->length = se_cmd->data_length; 999 req->context = cmd; 1000 return 0; 1001 } 1002 1003 static int usbg_send_status_response(struct se_cmd *se_cmd) 1004 { 1005 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1006 se_cmd); 1007 struct f_uas *fu = cmd->fu; 1008 1009 if (fu->flags & USBG_IS_BOT) 1010 return bot_send_status_response(cmd); 1011 else 1012 return uasp_send_status_response(cmd); 1013 } 1014 1015 static int usbg_send_write_request(struct se_cmd *se_cmd) 1016 { 1017 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1018 se_cmd); 1019 struct f_uas *fu = cmd->fu; 1020 1021 if (fu->flags & USBG_IS_BOT) 1022 return bot_send_write_request(cmd); 1023 else 1024 return uasp_send_write_request(cmd); 1025 } 1026 1027 static int usbg_send_read_response(struct se_cmd *se_cmd) 1028 { 1029 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1030 se_cmd); 1031 struct f_uas *fu = cmd->fu; 1032 1033 if (fu->flags & USBG_IS_BOT) 1034 return bot_send_read_response(cmd); 1035 else 1036 return uasp_send_read_response(cmd); 1037 } 1038 1039 static void usbg_cmd_work(struct work_struct *work) 1040 { 1041 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1042 struct se_cmd *se_cmd; 1043 struct tcm_usbg_nexus *tv_nexus; 1044 struct usbg_tpg *tpg; 1045 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1046 1047 se_cmd = &cmd->se_cmd; 1048 tpg = cmd->fu->tpg; 1049 tv_nexus = tpg->tpg_nexus; 1050 dir = get_cmd_dir(cmd->cmd_buf); 1051 if (dir < 0) { 1052 transport_init_se_cmd(se_cmd, 1053 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1054 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1055 cmd->prio_attr, cmd->sense_iu.sense, 1056 cmd->unpacked_lun); 1057 goto out; 1058 } 1059 1060 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1061 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1062 cmd->prio_attr, dir, flags) < 0) 1063 goto out; 1064 1065 return; 1066 1067 out: 1068 transport_send_check_condition_and_sense(se_cmd, 1069 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1070 transport_generic_free_cmd(&cmd->se_cmd, 0); 1071 } 1072 1073 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1074 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1075 { 1076 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1077 struct usbg_cmd *cmd; 1078 int tag, cpu; 1079 1080 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1081 if (tag < 0) 1082 return ERR_PTR(-ENOMEM); 1083 1084 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1085 memset(cmd, 0, sizeof(*cmd)); 1086 cmd->se_cmd.map_tag = tag; 1087 cmd->se_cmd.map_cpu = cpu; 1088 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1089 cmd->fu = fu; 1090 1091 return cmd; 1092 } 1093 1094 static void usbg_release_cmd(struct se_cmd *); 1095 1096 static int usbg_submit_command(struct f_uas *fu, 1097 void *cmdbuf, unsigned int len) 1098 { 1099 struct command_iu *cmd_iu = cmdbuf; 1100 struct usbg_cmd *cmd; 1101 struct usbg_tpg *tpg = fu->tpg; 1102 struct tcm_usbg_nexus *tv_nexus; 1103 u32 cmd_len; 1104 u16 scsi_tag; 1105 1106 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1107 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1108 return -EINVAL; 1109 } 1110 1111 tv_nexus = tpg->tpg_nexus; 1112 if (!tv_nexus) { 1113 pr_err("Missing nexus, ignoring command\n"); 1114 return -EINVAL; 1115 } 1116 1117 cmd_len = (cmd_iu->len & ~0x3) + 16; 1118 if (cmd_len > USBG_MAX_CMD) 1119 return -EINVAL; 1120 1121 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1122 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1123 if (IS_ERR(cmd)) { 1124 pr_err("usbg_get_cmd failed\n"); 1125 return -ENOMEM; 1126 } 1127 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1128 1129 if (fu->flags & USBG_USE_STREAMS) { 1130 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) 1131 goto err; 1132 if (!cmd->tag) 1133 cmd->stream = &fu->stream[0]; 1134 else 1135 cmd->stream = &fu->stream[cmd->tag - 1]; 1136 } else { 1137 cmd->stream = &fu->stream[0]; 1138 } 1139 1140 switch (cmd_iu->prio_attr & 0x7) { 1141 case UAS_HEAD_TAG: 1142 cmd->prio_attr = TCM_HEAD_TAG; 1143 break; 1144 case UAS_ORDERED_TAG: 1145 cmd->prio_attr = TCM_ORDERED_TAG; 1146 break; 1147 case UAS_ACA: 1148 cmd->prio_attr = TCM_ACA_TAG; 1149 break; 1150 default: 1151 pr_debug_once("Unsupported prio_attr: %02x.\n", 1152 cmd_iu->prio_attr); 1153 fallthrough; 1154 case UAS_SIMPLE_TAG: 1155 cmd->prio_attr = TCM_SIMPLE_TAG; 1156 break; 1157 } 1158 1159 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1160 1161 INIT_WORK(&cmd->work, usbg_cmd_work); 1162 queue_work(tpg->workqueue, &cmd->work); 1163 1164 return 0; 1165 err: 1166 usbg_release_cmd(&cmd->se_cmd); 1167 return -EINVAL; 1168 } 1169 1170 static void bot_cmd_work(struct work_struct *work) 1171 { 1172 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1173 struct se_cmd *se_cmd; 1174 struct tcm_usbg_nexus *tv_nexus; 1175 struct usbg_tpg *tpg; 1176 int dir; 1177 1178 se_cmd = &cmd->se_cmd; 1179 tpg = cmd->fu->tpg; 1180 tv_nexus = tpg->tpg_nexus; 1181 dir = get_cmd_dir(cmd->cmd_buf); 1182 if (dir < 0) { 1183 transport_init_se_cmd(se_cmd, 1184 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1185 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1186 cmd->prio_attr, cmd->sense_iu.sense, 1187 cmd->unpacked_lun); 1188 goto out; 1189 } 1190 1191 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1192 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1193 cmd->data_len, cmd->prio_attr, dir, 0) < 0) 1194 goto out; 1195 1196 return; 1197 1198 out: 1199 transport_send_check_condition_and_sense(se_cmd, 1200 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1201 transport_generic_free_cmd(&cmd->se_cmd, 0); 1202 } 1203 1204 static int bot_submit_command(struct f_uas *fu, 1205 void *cmdbuf, unsigned int len) 1206 { 1207 struct bulk_cb_wrap *cbw = cmdbuf; 1208 struct usbg_cmd *cmd; 1209 struct usbg_tpg *tpg = fu->tpg; 1210 struct tcm_usbg_nexus *tv_nexus; 1211 u32 cmd_len; 1212 1213 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1214 pr_err("Wrong signature on CBW\n"); 1215 return -EINVAL; 1216 } 1217 if (len != 31) { 1218 pr_err("Wrong length for CBW\n"); 1219 return -EINVAL; 1220 } 1221 1222 cmd_len = cbw->Length; 1223 if (cmd_len < 1 || cmd_len > 16) 1224 return -EINVAL; 1225 1226 tv_nexus = tpg->tpg_nexus; 1227 if (!tv_nexus) { 1228 pr_err("Missing nexus, ignoring command\n"); 1229 return -ENODEV; 1230 } 1231 1232 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1233 if (IS_ERR(cmd)) { 1234 pr_err("usbg_get_cmd failed\n"); 1235 return -ENOMEM; 1236 } 1237 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1238 1239 cmd->bot_tag = cbw->Tag; 1240 cmd->prio_attr = TCM_SIMPLE_TAG; 1241 cmd->unpacked_lun = cbw->Lun; 1242 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1243 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1244 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1245 1246 INIT_WORK(&cmd->work, bot_cmd_work); 1247 queue_work(tpg->workqueue, &cmd->work); 1248 1249 return 0; 1250 } 1251 1252 /* Start fabric.c code */ 1253 1254 static int usbg_check_true(struct se_portal_group *se_tpg) 1255 { 1256 return 1; 1257 } 1258 1259 static int usbg_check_false(struct se_portal_group *se_tpg) 1260 { 1261 return 0; 1262 } 1263 1264 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1265 { 1266 struct usbg_tpg *tpg = container_of(se_tpg, 1267 struct usbg_tpg, se_tpg); 1268 struct usbg_tport *tport = tpg->tport; 1269 1270 return &tport->tport_name[0]; 1271 } 1272 1273 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1274 { 1275 struct usbg_tpg *tpg = container_of(se_tpg, 1276 struct usbg_tpg, se_tpg); 1277 return tpg->tport_tpgt; 1278 } 1279 1280 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg) 1281 { 1282 return 1; 1283 } 1284 1285 static void usbg_release_cmd(struct se_cmd *se_cmd) 1286 { 1287 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1288 se_cmd); 1289 struct se_session *se_sess = se_cmd->se_sess; 1290 1291 kfree(cmd->data_buf); 1292 target_free_tag(se_sess, se_cmd); 1293 } 1294 1295 static u32 usbg_sess_get_index(struct se_session *se_sess) 1296 { 1297 return 0; 1298 } 1299 1300 static void usbg_set_default_node_attrs(struct se_node_acl *nacl) 1301 { 1302 } 1303 1304 static int usbg_get_cmd_state(struct se_cmd *se_cmd) 1305 { 1306 return 0; 1307 } 1308 1309 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1310 { 1311 } 1312 1313 static void usbg_aborted_task(struct se_cmd *se_cmd) 1314 { 1315 } 1316 1317 static const char *usbg_check_wwn(const char *name) 1318 { 1319 const char *n; 1320 unsigned int len; 1321 1322 n = strstr(name, "naa."); 1323 if (!n) 1324 return NULL; 1325 n += 4; 1326 len = strlen(n); 1327 if (len == 0 || len > USBG_NAMELEN - 1) 1328 return NULL; 1329 return n; 1330 } 1331 1332 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1333 { 1334 if (!usbg_check_wwn(name)) 1335 return -EINVAL; 1336 return 0; 1337 } 1338 1339 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1340 const char *name) 1341 { 1342 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1343 tport_wwn); 1344 struct usbg_tpg *tpg; 1345 unsigned long tpgt; 1346 int ret; 1347 struct f_tcm_opts *opts; 1348 unsigned i; 1349 1350 if (strstr(name, "tpgt_") != name) 1351 return ERR_PTR(-EINVAL); 1352 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1353 return ERR_PTR(-EINVAL); 1354 ret = -ENODEV; 1355 mutex_lock(&tpg_instances_lock); 1356 for (i = 0; i < TPG_INSTANCES; ++i) 1357 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1358 break; 1359 if (i == TPG_INSTANCES) 1360 goto unlock_inst; 1361 1362 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1363 func_inst); 1364 mutex_lock(&opts->dep_lock); 1365 if (!opts->ready) 1366 goto unlock_dep; 1367 1368 if (opts->has_dep) { 1369 if (!try_module_get(opts->dependent)) 1370 goto unlock_dep; 1371 } else { 1372 ret = configfs_depend_item_unlocked( 1373 wwn->wwn_group.cg_subsys, 1374 &opts->func_inst.group.cg_item); 1375 if (ret) 1376 goto unlock_dep; 1377 } 1378 1379 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1380 ret = -ENOMEM; 1381 if (!tpg) 1382 goto unref_dep; 1383 mutex_init(&tpg->tpg_mutex); 1384 atomic_set(&tpg->tpg_port_count, 0); 1385 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1386 if (!tpg->workqueue) 1387 goto free_tpg; 1388 1389 tpg->tport = tport; 1390 tpg->tport_tpgt = tpgt; 1391 1392 /* 1393 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1394 * pretend to be SAS.. 1395 */ 1396 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1397 if (ret < 0) 1398 goto free_workqueue; 1399 1400 tpg_instances[i].tpg = tpg; 1401 tpg->fi = tpg_instances[i].func_inst; 1402 mutex_unlock(&opts->dep_lock); 1403 mutex_unlock(&tpg_instances_lock); 1404 return &tpg->se_tpg; 1405 1406 free_workqueue: 1407 destroy_workqueue(tpg->workqueue); 1408 free_tpg: 1409 kfree(tpg); 1410 unref_dep: 1411 if (opts->has_dep) 1412 module_put(opts->dependent); 1413 else 1414 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1415 unlock_dep: 1416 mutex_unlock(&opts->dep_lock); 1417 unlock_inst: 1418 mutex_unlock(&tpg_instances_lock); 1419 1420 return ERR_PTR(ret); 1421 } 1422 1423 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1424 1425 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1426 { 1427 struct usbg_tpg *tpg = container_of(se_tpg, 1428 struct usbg_tpg, se_tpg); 1429 unsigned i; 1430 struct f_tcm_opts *opts; 1431 1432 tcm_usbg_drop_nexus(tpg); 1433 core_tpg_deregister(se_tpg); 1434 destroy_workqueue(tpg->workqueue); 1435 1436 mutex_lock(&tpg_instances_lock); 1437 for (i = 0; i < TPG_INSTANCES; ++i) 1438 if (tpg_instances[i].tpg == tpg) 1439 break; 1440 if (i < TPG_INSTANCES) { 1441 tpg_instances[i].tpg = NULL; 1442 opts = container_of(tpg_instances[i].func_inst, 1443 struct f_tcm_opts, func_inst); 1444 mutex_lock(&opts->dep_lock); 1445 if (opts->has_dep) 1446 module_put(opts->dependent); 1447 else 1448 configfs_undepend_item_unlocked( 1449 &opts->func_inst.group.cg_item); 1450 mutex_unlock(&opts->dep_lock); 1451 } 1452 mutex_unlock(&tpg_instances_lock); 1453 1454 kfree(tpg); 1455 } 1456 1457 static struct se_wwn *usbg_make_tport( 1458 struct target_fabric_configfs *tf, 1459 struct config_group *group, 1460 const char *name) 1461 { 1462 struct usbg_tport *tport; 1463 const char *wnn_name; 1464 u64 wwpn = 0; 1465 1466 wnn_name = usbg_check_wwn(name); 1467 if (!wnn_name) 1468 return ERR_PTR(-EINVAL); 1469 1470 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1471 if (!(tport)) 1472 return ERR_PTR(-ENOMEM); 1473 1474 tport->tport_wwpn = wwpn; 1475 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1476 return &tport->tport_wwn; 1477 } 1478 1479 static void usbg_drop_tport(struct se_wwn *wwn) 1480 { 1481 struct usbg_tport *tport = container_of(wwn, 1482 struct usbg_tport, tport_wwn); 1483 kfree(tport); 1484 } 1485 1486 /* 1487 * If somebody feels like dropping the version property, go ahead. 1488 */ 1489 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1490 { 1491 return sprintf(page, "usb-gadget fabric module\n"); 1492 } 1493 1494 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1495 1496 static struct configfs_attribute *usbg_wwn_attrs[] = { 1497 &usbg_wwn_attr_version, 1498 NULL, 1499 }; 1500 1501 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page) 1502 { 1503 struct se_portal_group *se_tpg = to_tpg(item); 1504 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1505 1506 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect); 1507 } 1508 1509 static int usbg_attach(struct usbg_tpg *); 1510 static void usbg_detach(struct usbg_tpg *); 1511 1512 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item, 1513 const char *page, size_t count) 1514 { 1515 struct se_portal_group *se_tpg = to_tpg(item); 1516 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1517 bool op; 1518 ssize_t ret; 1519 1520 ret = strtobool(page, &op); 1521 if (ret) 1522 return ret; 1523 1524 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect)) 1525 return -EINVAL; 1526 1527 if (op) 1528 ret = usbg_attach(tpg); 1529 else 1530 usbg_detach(tpg); 1531 if (ret) 1532 return ret; 1533 1534 tpg->gadget_connect = op; 1535 1536 return count; 1537 } 1538 1539 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1540 { 1541 struct se_portal_group *se_tpg = to_tpg(item); 1542 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1543 struct tcm_usbg_nexus *tv_nexus; 1544 ssize_t ret; 1545 1546 mutex_lock(&tpg->tpg_mutex); 1547 tv_nexus = tpg->tpg_nexus; 1548 if (!tv_nexus) { 1549 ret = -ENODEV; 1550 goto out; 1551 } 1552 ret = snprintf(page, PAGE_SIZE, "%s\n", 1553 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1554 out: 1555 mutex_unlock(&tpg->tpg_mutex); 1556 return ret; 1557 } 1558 1559 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1560 struct se_session *se_sess, void *p) 1561 { 1562 struct usbg_tpg *tpg = container_of(se_tpg, 1563 struct usbg_tpg, se_tpg); 1564 1565 tpg->tpg_nexus = p; 1566 return 0; 1567 } 1568 1569 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1570 { 1571 struct tcm_usbg_nexus *tv_nexus; 1572 int ret = 0; 1573 1574 mutex_lock(&tpg->tpg_mutex); 1575 if (tpg->tpg_nexus) { 1576 ret = -EEXIST; 1577 pr_debug("tpg->tpg_nexus already exists\n"); 1578 goto out_unlock; 1579 } 1580 1581 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1582 if (!tv_nexus) { 1583 ret = -ENOMEM; 1584 goto out_unlock; 1585 } 1586 1587 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1588 USB_G_DEFAULT_SESSION_TAGS, 1589 sizeof(struct usbg_cmd), 1590 TARGET_PROT_NORMAL, name, 1591 tv_nexus, usbg_alloc_sess_cb); 1592 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1593 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1594 pr_debug(MAKE_NEXUS_MSG, name); 1595 #undef MAKE_NEXUS_MSG 1596 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1597 kfree(tv_nexus); 1598 } 1599 1600 out_unlock: 1601 mutex_unlock(&tpg->tpg_mutex); 1602 return ret; 1603 } 1604 1605 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1606 { 1607 struct se_session *se_sess; 1608 struct tcm_usbg_nexus *tv_nexus; 1609 int ret = -ENODEV; 1610 1611 mutex_lock(&tpg->tpg_mutex); 1612 tv_nexus = tpg->tpg_nexus; 1613 if (!tv_nexus) 1614 goto out; 1615 1616 se_sess = tv_nexus->tvn_se_sess; 1617 if (!se_sess) 1618 goto out; 1619 1620 if (atomic_read(&tpg->tpg_port_count)) { 1621 ret = -EPERM; 1622 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1623 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1624 #undef MSG 1625 goto out; 1626 } 1627 1628 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1629 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1630 /* 1631 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1632 */ 1633 target_remove_session(se_sess); 1634 tpg->tpg_nexus = NULL; 1635 1636 kfree(tv_nexus); 1637 ret = 0; 1638 out: 1639 mutex_unlock(&tpg->tpg_mutex); 1640 return ret; 1641 } 1642 1643 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1644 const char *page, size_t count) 1645 { 1646 struct se_portal_group *se_tpg = to_tpg(item); 1647 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1648 unsigned char i_port[USBG_NAMELEN], *ptr; 1649 int ret; 1650 1651 if (!strncmp(page, "NULL", 4)) { 1652 ret = tcm_usbg_drop_nexus(tpg); 1653 return (!ret) ? count : ret; 1654 } 1655 if (strlen(page) >= USBG_NAMELEN) { 1656 1657 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1658 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1659 #undef NEXUS_STORE_MSG 1660 return -EINVAL; 1661 } 1662 snprintf(i_port, USBG_NAMELEN, "%s", page); 1663 1664 ptr = strstr(i_port, "naa."); 1665 if (!ptr) { 1666 pr_err("Missing 'naa.' prefix\n"); 1667 return -EINVAL; 1668 } 1669 1670 if (i_port[strlen(i_port) - 1] == '\n') 1671 i_port[strlen(i_port) - 1] = '\0'; 1672 1673 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1674 if (ret < 0) 1675 return ret; 1676 return count; 1677 } 1678 1679 CONFIGFS_ATTR(tcm_usbg_tpg_, enable); 1680 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1681 1682 static struct configfs_attribute *usbg_base_attrs[] = { 1683 &tcm_usbg_tpg_attr_enable, 1684 &tcm_usbg_tpg_attr_nexus, 1685 NULL, 1686 }; 1687 1688 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1689 { 1690 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1691 1692 atomic_inc(&tpg->tpg_port_count); 1693 smp_mb__after_atomic(); 1694 return 0; 1695 } 1696 1697 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1698 struct se_lun *se_lun) 1699 { 1700 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1701 1702 atomic_dec(&tpg->tpg_port_count); 1703 smp_mb__after_atomic(); 1704 } 1705 1706 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1707 { 1708 return target_put_sess_cmd(se_cmd); 1709 } 1710 1711 static const struct target_core_fabric_ops usbg_ops = { 1712 .module = THIS_MODULE, 1713 .fabric_name = "usb_gadget", 1714 .tpg_get_wwn = usbg_get_fabric_wwn, 1715 .tpg_get_tag = usbg_get_tag, 1716 .tpg_check_demo_mode = usbg_check_true, 1717 .tpg_check_demo_mode_cache = usbg_check_false, 1718 .tpg_check_demo_mode_write_protect = usbg_check_false, 1719 .tpg_check_prod_mode_write_protect = usbg_check_false, 1720 .tpg_get_inst_index = usbg_tpg_get_inst_index, 1721 .release_cmd = usbg_release_cmd, 1722 .sess_get_index = usbg_sess_get_index, 1723 .sess_get_initiator_sid = NULL, 1724 .write_pending = usbg_send_write_request, 1725 .set_default_node_attributes = usbg_set_default_node_attrs, 1726 .get_cmd_state = usbg_get_cmd_state, 1727 .queue_data_in = usbg_send_read_response, 1728 .queue_status = usbg_send_status_response, 1729 .queue_tm_rsp = usbg_queue_tm_rsp, 1730 .aborted_task = usbg_aborted_task, 1731 .check_stop_free = usbg_check_stop_free, 1732 1733 .fabric_make_wwn = usbg_make_tport, 1734 .fabric_drop_wwn = usbg_drop_tport, 1735 .fabric_make_tpg = usbg_make_tpg, 1736 .fabric_drop_tpg = usbg_drop_tpg, 1737 .fabric_post_link = usbg_port_link, 1738 .fabric_pre_unlink = usbg_port_unlink, 1739 .fabric_init_nodeacl = usbg_init_nodeacl, 1740 1741 .tfc_wwn_attrs = usbg_wwn_attrs, 1742 .tfc_tpg_base_attrs = usbg_base_attrs, 1743 }; 1744 1745 /* Start gadget.c code */ 1746 1747 static struct usb_interface_descriptor bot_intf_desc = { 1748 .bLength = sizeof(bot_intf_desc), 1749 .bDescriptorType = USB_DT_INTERFACE, 1750 .bNumEndpoints = 2, 1751 .bAlternateSetting = USB_G_ALT_INT_BBB, 1752 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1753 .bInterfaceSubClass = USB_SC_SCSI, 1754 .bInterfaceProtocol = USB_PR_BULK, 1755 }; 1756 1757 static struct usb_interface_descriptor uasp_intf_desc = { 1758 .bLength = sizeof(uasp_intf_desc), 1759 .bDescriptorType = USB_DT_INTERFACE, 1760 .bNumEndpoints = 4, 1761 .bAlternateSetting = USB_G_ALT_INT_UAS, 1762 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1763 .bInterfaceSubClass = USB_SC_SCSI, 1764 .bInterfaceProtocol = USB_PR_UAS, 1765 }; 1766 1767 static struct usb_endpoint_descriptor uasp_bi_desc = { 1768 .bLength = USB_DT_ENDPOINT_SIZE, 1769 .bDescriptorType = USB_DT_ENDPOINT, 1770 .bEndpointAddress = USB_DIR_IN, 1771 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1772 .wMaxPacketSize = cpu_to_le16(512), 1773 }; 1774 1775 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1776 .bLength = USB_DT_ENDPOINT_SIZE, 1777 .bDescriptorType = USB_DT_ENDPOINT, 1778 .bEndpointAddress = USB_DIR_IN, 1779 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1780 }; 1781 1782 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1783 .bLength = sizeof(uasp_bi_pipe_desc), 1784 .bDescriptorType = USB_DT_PIPE_USAGE, 1785 .bPipeID = DATA_IN_PIPE_ID, 1786 }; 1787 1788 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1789 .bLength = USB_DT_ENDPOINT_SIZE, 1790 .bDescriptorType = USB_DT_ENDPOINT, 1791 .bEndpointAddress = USB_DIR_IN, 1792 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1793 .wMaxPacketSize = cpu_to_le16(1024), 1794 }; 1795 1796 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1797 .bLength = sizeof(uasp_bi_ep_comp_desc), 1798 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1799 .bMaxBurst = 0, 1800 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1801 .wBytesPerInterval = 0, 1802 }; 1803 1804 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1805 .bLength = sizeof(bot_bi_ep_comp_desc), 1806 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1807 .bMaxBurst = 0, 1808 }; 1809 1810 static struct usb_endpoint_descriptor uasp_bo_desc = { 1811 .bLength = USB_DT_ENDPOINT_SIZE, 1812 .bDescriptorType = USB_DT_ENDPOINT, 1813 .bEndpointAddress = USB_DIR_OUT, 1814 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1815 .wMaxPacketSize = cpu_to_le16(512), 1816 }; 1817 1818 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1819 .bLength = USB_DT_ENDPOINT_SIZE, 1820 .bDescriptorType = USB_DT_ENDPOINT, 1821 .bEndpointAddress = USB_DIR_OUT, 1822 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1823 }; 1824 1825 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1826 .bLength = sizeof(uasp_bo_pipe_desc), 1827 .bDescriptorType = USB_DT_PIPE_USAGE, 1828 .bPipeID = DATA_OUT_PIPE_ID, 1829 }; 1830 1831 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1832 .bLength = USB_DT_ENDPOINT_SIZE, 1833 .bDescriptorType = USB_DT_ENDPOINT, 1834 .bEndpointAddress = USB_DIR_OUT, 1835 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1836 .wMaxPacketSize = cpu_to_le16(0x400), 1837 }; 1838 1839 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1840 .bLength = sizeof(uasp_bo_ep_comp_desc), 1841 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1842 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1843 }; 1844 1845 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1846 .bLength = sizeof(bot_bo_ep_comp_desc), 1847 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1848 }; 1849 1850 static struct usb_endpoint_descriptor uasp_status_desc = { 1851 .bLength = USB_DT_ENDPOINT_SIZE, 1852 .bDescriptorType = USB_DT_ENDPOINT, 1853 .bEndpointAddress = USB_DIR_IN, 1854 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1855 .wMaxPacketSize = cpu_to_le16(512), 1856 }; 1857 1858 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1859 .bLength = USB_DT_ENDPOINT_SIZE, 1860 .bDescriptorType = USB_DT_ENDPOINT, 1861 .bEndpointAddress = USB_DIR_IN, 1862 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1863 }; 1864 1865 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1866 .bLength = sizeof(uasp_status_pipe_desc), 1867 .bDescriptorType = USB_DT_PIPE_USAGE, 1868 .bPipeID = STATUS_PIPE_ID, 1869 }; 1870 1871 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1872 .bLength = USB_DT_ENDPOINT_SIZE, 1873 .bDescriptorType = USB_DT_ENDPOINT, 1874 .bEndpointAddress = USB_DIR_IN, 1875 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1876 .wMaxPacketSize = cpu_to_le16(1024), 1877 }; 1878 1879 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1880 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1881 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1882 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1883 }; 1884 1885 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1886 .bLength = USB_DT_ENDPOINT_SIZE, 1887 .bDescriptorType = USB_DT_ENDPOINT, 1888 .bEndpointAddress = USB_DIR_OUT, 1889 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1890 .wMaxPacketSize = cpu_to_le16(512), 1891 }; 1892 1893 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1894 .bLength = USB_DT_ENDPOINT_SIZE, 1895 .bDescriptorType = USB_DT_ENDPOINT, 1896 .bEndpointAddress = USB_DIR_OUT, 1897 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1898 }; 1899 1900 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1901 .bLength = sizeof(uasp_cmd_pipe_desc), 1902 .bDescriptorType = USB_DT_PIPE_USAGE, 1903 .bPipeID = CMD_PIPE_ID, 1904 }; 1905 1906 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1907 .bLength = USB_DT_ENDPOINT_SIZE, 1908 .bDescriptorType = USB_DT_ENDPOINT, 1909 .bEndpointAddress = USB_DIR_OUT, 1910 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1911 .wMaxPacketSize = cpu_to_le16(1024), 1912 }; 1913 1914 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1915 .bLength = sizeof(uasp_cmd_comp_desc), 1916 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1917 }; 1918 1919 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1920 (struct usb_descriptor_header *) &bot_intf_desc, 1921 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1922 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1923 1924 (struct usb_descriptor_header *) &uasp_intf_desc, 1925 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1926 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1927 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1928 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1929 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1930 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1931 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1932 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1933 NULL, 1934 }; 1935 1936 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1937 (struct usb_descriptor_header *) &bot_intf_desc, 1938 (struct usb_descriptor_header *) &uasp_bi_desc, 1939 (struct usb_descriptor_header *) &uasp_bo_desc, 1940 1941 (struct usb_descriptor_header *) &uasp_intf_desc, 1942 (struct usb_descriptor_header *) &uasp_bi_desc, 1943 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1944 (struct usb_descriptor_header *) &uasp_bo_desc, 1945 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1946 (struct usb_descriptor_header *) &uasp_status_desc, 1947 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1948 (struct usb_descriptor_header *) &uasp_cmd_desc, 1949 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1950 NULL, 1951 }; 1952 1953 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1954 (struct usb_descriptor_header *) &bot_intf_desc, 1955 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1956 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1957 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1958 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1959 1960 (struct usb_descriptor_header *) &uasp_intf_desc, 1961 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1962 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1963 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1964 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1965 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1966 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1967 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1968 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1969 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1970 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1971 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1972 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1973 NULL, 1974 }; 1975 1976 static struct usb_string tcm_us_strings[] = { 1977 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1978 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1979 { }, 1980 }; 1981 1982 static struct usb_gadget_strings tcm_stringtab = { 1983 .language = 0x0409, 1984 .strings = tcm_us_strings, 1985 }; 1986 1987 static struct usb_gadget_strings *tcm_strings[] = { 1988 &tcm_stringtab, 1989 NULL, 1990 }; 1991 1992 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1993 { 1994 struct f_uas *fu = to_f_uas(f); 1995 struct usb_string *us; 1996 struct usb_gadget *gadget = c->cdev->gadget; 1997 struct usb_ep *ep; 1998 struct f_tcm_opts *opts; 1999 int iface; 2000 int ret; 2001 2002 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 2003 2004 mutex_lock(&opts->dep_lock); 2005 if (!opts->can_attach) { 2006 mutex_unlock(&opts->dep_lock); 2007 return -ENODEV; 2008 } 2009 mutex_unlock(&opts->dep_lock); 2010 us = usb_gstrings_attach(c->cdev, tcm_strings, 2011 ARRAY_SIZE(tcm_us_strings)); 2012 if (IS_ERR(us)) 2013 return PTR_ERR(us); 2014 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 2015 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 2016 2017 iface = usb_interface_id(c, f); 2018 if (iface < 0) 2019 return iface; 2020 2021 bot_intf_desc.bInterfaceNumber = iface; 2022 uasp_intf_desc.bInterfaceNumber = iface; 2023 fu->iface = iface; 2024 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 2025 &uasp_bi_ep_comp_desc); 2026 if (!ep) 2027 goto ep_fail; 2028 2029 fu->ep_in = ep; 2030 2031 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 2032 &uasp_bo_ep_comp_desc); 2033 if (!ep) 2034 goto ep_fail; 2035 fu->ep_out = ep; 2036 2037 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 2038 &uasp_status_in_ep_comp_desc); 2039 if (!ep) 2040 goto ep_fail; 2041 fu->ep_status = ep; 2042 2043 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 2044 &uasp_cmd_comp_desc); 2045 if (!ep) 2046 goto ep_fail; 2047 fu->ep_cmd = ep; 2048 2049 /* Assume endpoint addresses are the same for both speeds */ 2050 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2051 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2052 uasp_status_desc.bEndpointAddress = 2053 uasp_ss_status_desc.bEndpointAddress; 2054 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2055 2056 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2057 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2058 uasp_fs_status_desc.bEndpointAddress = 2059 uasp_ss_status_desc.bEndpointAddress; 2060 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2061 2062 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2063 uasp_hs_function_desc, uasp_ss_function_desc, NULL); 2064 if (ret) 2065 goto ep_fail; 2066 2067 return 0; 2068 ep_fail: 2069 pr_err("Can't claim all required eps\n"); 2070 2071 return -ENOTSUPP; 2072 } 2073 2074 struct guas_setup_wq { 2075 struct work_struct work; 2076 struct f_uas *fu; 2077 unsigned int alt; 2078 }; 2079 2080 static void tcm_delayed_set_alt(struct work_struct *wq) 2081 { 2082 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2083 work); 2084 struct f_uas *fu = work->fu; 2085 int alt = work->alt; 2086 2087 kfree(work); 2088 2089 if (fu->flags & USBG_IS_BOT) 2090 bot_cleanup_old_alt(fu); 2091 if (fu->flags & USBG_IS_UAS) 2092 uasp_cleanup_old_alt(fu); 2093 2094 if (alt == USB_G_ALT_INT_BBB) 2095 bot_set_alt(fu); 2096 else if (alt == USB_G_ALT_INT_UAS) 2097 uasp_set_alt(fu); 2098 usb_composite_setup_continue(fu->function.config->cdev); 2099 } 2100 2101 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2102 { 2103 if (intf == bot_intf_desc.bInterfaceNumber) 2104 return USB_G_ALT_INT_BBB; 2105 if (intf == uasp_intf_desc.bInterfaceNumber) 2106 return USB_G_ALT_INT_UAS; 2107 2108 return -EOPNOTSUPP; 2109 } 2110 2111 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2112 { 2113 struct f_uas *fu = to_f_uas(f); 2114 2115 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2116 struct guas_setup_wq *work; 2117 2118 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2119 if (!work) 2120 return -ENOMEM; 2121 INIT_WORK(&work->work, tcm_delayed_set_alt); 2122 work->fu = fu; 2123 work->alt = alt; 2124 schedule_work(&work->work); 2125 return USB_GADGET_DELAYED_STATUS; 2126 } 2127 return -EOPNOTSUPP; 2128 } 2129 2130 static void tcm_disable(struct usb_function *f) 2131 { 2132 struct f_uas *fu = to_f_uas(f); 2133 2134 if (fu->flags & USBG_IS_UAS) 2135 uasp_cleanup_old_alt(fu); 2136 else if (fu->flags & USBG_IS_BOT) 2137 bot_cleanup_old_alt(fu); 2138 fu->flags = 0; 2139 } 2140 2141 static int tcm_setup(struct usb_function *f, 2142 const struct usb_ctrlrequest *ctrl) 2143 { 2144 struct f_uas *fu = to_f_uas(f); 2145 2146 if (!(fu->flags & USBG_IS_BOT)) 2147 return -EOPNOTSUPP; 2148 2149 return usbg_bot_setup(f, ctrl); 2150 } 2151 2152 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2153 { 2154 return container_of(to_config_group(item), struct f_tcm_opts, 2155 func_inst.group); 2156 } 2157 2158 static void tcm_attr_release(struct config_item *item) 2159 { 2160 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2161 2162 usb_put_function_instance(&opts->func_inst); 2163 } 2164 2165 static struct configfs_item_operations tcm_item_ops = { 2166 .release = tcm_attr_release, 2167 }; 2168 2169 static const struct config_item_type tcm_func_type = { 2170 .ct_item_ops = &tcm_item_ops, 2171 .ct_owner = THIS_MODULE, 2172 }; 2173 2174 static void tcm_free_inst(struct usb_function_instance *f) 2175 { 2176 struct f_tcm_opts *opts; 2177 unsigned i; 2178 2179 opts = container_of(f, struct f_tcm_opts, func_inst); 2180 2181 mutex_lock(&tpg_instances_lock); 2182 for (i = 0; i < TPG_INSTANCES; ++i) 2183 if (tpg_instances[i].func_inst == f) 2184 break; 2185 if (i < TPG_INSTANCES) 2186 tpg_instances[i].func_inst = NULL; 2187 mutex_unlock(&tpg_instances_lock); 2188 2189 kfree(opts); 2190 } 2191 2192 static int tcm_register_callback(struct usb_function_instance *f) 2193 { 2194 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2195 2196 mutex_lock(&opts->dep_lock); 2197 opts->can_attach = true; 2198 mutex_unlock(&opts->dep_lock); 2199 2200 return 0; 2201 } 2202 2203 static void tcm_unregister_callback(struct usb_function_instance *f) 2204 { 2205 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2206 2207 mutex_lock(&opts->dep_lock); 2208 unregister_gadget_item(opts-> 2209 func_inst.group.cg_item.ci_parent->ci_parent); 2210 opts->can_attach = false; 2211 mutex_unlock(&opts->dep_lock); 2212 } 2213 2214 static int usbg_attach(struct usbg_tpg *tpg) 2215 { 2216 struct usb_function_instance *f = tpg->fi; 2217 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2218 2219 if (opts->tcm_register_callback) 2220 return opts->tcm_register_callback(f); 2221 2222 return 0; 2223 } 2224 2225 static void usbg_detach(struct usbg_tpg *tpg) 2226 { 2227 struct usb_function_instance *f = tpg->fi; 2228 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2229 2230 if (opts->tcm_unregister_callback) 2231 opts->tcm_unregister_callback(f); 2232 } 2233 2234 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2235 { 2236 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2237 2238 pr_debug("tcm: Activating %s\n", name); 2239 2240 mutex_lock(&opts->dep_lock); 2241 opts->ready = true; 2242 mutex_unlock(&opts->dep_lock); 2243 2244 return 0; 2245 } 2246 2247 static struct usb_function_instance *tcm_alloc_inst(void) 2248 { 2249 struct f_tcm_opts *opts; 2250 int i; 2251 2252 2253 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2254 if (!opts) 2255 return ERR_PTR(-ENOMEM); 2256 2257 mutex_lock(&tpg_instances_lock); 2258 for (i = 0; i < TPG_INSTANCES; ++i) 2259 if (!tpg_instances[i].func_inst) 2260 break; 2261 2262 if (i == TPG_INSTANCES) { 2263 mutex_unlock(&tpg_instances_lock); 2264 kfree(opts); 2265 return ERR_PTR(-EBUSY); 2266 } 2267 tpg_instances[i].func_inst = &opts->func_inst; 2268 mutex_unlock(&tpg_instances_lock); 2269 2270 mutex_init(&opts->dep_lock); 2271 opts->func_inst.set_inst_name = tcm_set_name; 2272 opts->func_inst.free_func_inst = tcm_free_inst; 2273 opts->tcm_register_callback = tcm_register_callback; 2274 opts->tcm_unregister_callback = tcm_unregister_callback; 2275 2276 config_group_init_type_name(&opts->func_inst.group, "", 2277 &tcm_func_type); 2278 2279 return &opts->func_inst; 2280 } 2281 2282 static void tcm_free(struct usb_function *f) 2283 { 2284 struct f_uas *tcm = to_f_uas(f); 2285 2286 kfree(tcm); 2287 } 2288 2289 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2290 { 2291 usb_free_all_descriptors(f); 2292 } 2293 2294 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2295 { 2296 struct f_uas *fu; 2297 unsigned i; 2298 2299 mutex_lock(&tpg_instances_lock); 2300 for (i = 0; i < TPG_INSTANCES; ++i) 2301 if (tpg_instances[i].func_inst == fi) 2302 break; 2303 if (i == TPG_INSTANCES) { 2304 mutex_unlock(&tpg_instances_lock); 2305 return ERR_PTR(-ENODEV); 2306 } 2307 2308 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2309 if (!fu) { 2310 mutex_unlock(&tpg_instances_lock); 2311 return ERR_PTR(-ENOMEM); 2312 } 2313 2314 fu->function.name = "Target Function"; 2315 fu->function.bind = tcm_bind; 2316 fu->function.unbind = tcm_unbind; 2317 fu->function.set_alt = tcm_set_alt; 2318 fu->function.get_alt = tcm_get_alt; 2319 fu->function.setup = tcm_setup; 2320 fu->function.disable = tcm_disable; 2321 fu->function.free_func = tcm_free; 2322 fu->tpg = tpg_instances[i].tpg; 2323 mutex_unlock(&tpg_instances_lock); 2324 2325 return &fu->function; 2326 } 2327 2328 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2329 2330 static int tcm_init(void) 2331 { 2332 int ret; 2333 2334 ret = usb_function_register(&tcmusb_func); 2335 if (ret) 2336 return ret; 2337 2338 ret = target_register_template(&usbg_ops); 2339 if (ret) 2340 usb_function_unregister(&tcmusb_func); 2341 2342 return ret; 2343 } 2344 module_init(tcm_init); 2345 2346 static void tcm_exit(void) 2347 { 2348 target_unregister_template(&usbg_ops); 2349 usb_function_unregister(&tcmusb_func); 2350 } 2351 module_exit(tcm_exit); 2352 2353 MODULE_LICENSE("GPL"); 2354 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2355