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_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB); 396 ret = usb_ep_enable(fu->ep_in); 397 if (ret) 398 goto err_b_in; 399 400 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB); 401 ret = usb_ep_enable(fu->ep_out); 402 if (ret) 403 goto err_b_out; 404 405 ret = bot_prepare_reqs(fu); 406 if (ret) 407 goto err_wq; 408 fu->flags |= USBG_ENABLED; 409 pr_info("Using the BOT protocol\n"); 410 return; 411 err_wq: 412 usb_ep_disable(fu->ep_out); 413 err_b_out: 414 usb_ep_disable(fu->ep_in); 415 err_b_in: 416 fu->flags = USBG_IS_BOT; 417 } 418 419 static int usbg_bot_setup(struct usb_function *f, 420 const struct usb_ctrlrequest *ctrl) 421 { 422 struct f_uas *fu = to_f_uas(f); 423 struct usb_composite_dev *cdev = f->config->cdev; 424 u16 w_value = le16_to_cpu(ctrl->wValue); 425 u16 w_length = le16_to_cpu(ctrl->wLength); 426 int luns; 427 u8 *ret_lun; 428 429 switch (ctrl->bRequest) { 430 case US_BULK_GET_MAX_LUN: 431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 432 USB_RECIP_INTERFACE)) 433 return -ENOTSUPP; 434 435 if (w_length < 1) 436 return -EINVAL; 437 if (w_value != 0) 438 return -EINVAL; 439 luns = atomic_read(&fu->tpg->tpg_port_count); 440 if (!luns) { 441 pr_err("No LUNs configured?\n"); 442 return -EINVAL; 443 } 444 /* 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; 756 757 err_sts: 758 usb_ep_free_request(fu->ep_out, stream->req_out); 759 stream->req_out = NULL; 760 err_out: 761 usb_ep_free_request(fu->ep_in, stream->req_in); 762 stream->req_in = NULL; 763 out: 764 return -ENOMEM; 765 } 766 767 static int uasp_alloc_cmd(struct f_uas *fu) 768 { 769 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 770 if (!fu->cmd.req) 771 goto err; 772 773 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 774 if (!fu->cmd.buf) 775 goto err_buf; 776 777 fu->cmd.req->complete = uasp_cmd_complete; 778 fu->cmd.req->buf = fu->cmd.buf; 779 fu->cmd.req->length = fu->ep_cmd->maxpacket; 780 fu->cmd.req->context = fu; 781 return 0; 782 783 err_buf: 784 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 785 err: 786 return -ENOMEM; 787 } 788 789 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams) 790 { 791 int i; 792 793 for (i = 0; i < max_streams; i++) { 794 struct uas_stream *s = &fu->stream[i]; 795 796 s->req_in->stream_id = i + 1; 797 s->req_out->stream_id = i + 1; 798 s->req_status->stream_id = i + 1; 799 } 800 } 801 802 static int uasp_prepare_reqs(struct f_uas *fu) 803 { 804 int ret; 805 int i; 806 int max_streams; 807 808 if (fu->flags & USBG_USE_STREAMS) 809 max_streams = UASP_SS_EP_COMP_NUM_STREAMS; 810 else 811 max_streams = 1; 812 813 for (i = 0; i < max_streams; i++) { 814 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 815 if (ret) 816 goto err_cleanup; 817 } 818 819 ret = uasp_alloc_cmd(fu); 820 if (ret) 821 goto err_free_stream; 822 uasp_setup_stream_res(fu, max_streams); 823 824 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); 825 if (ret) 826 goto err_free_stream; 827 828 return 0; 829 830 err_free_stream: 831 uasp_free_cmdreq(fu); 832 833 err_cleanup: 834 if (i) { 835 do { 836 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 837 i--; 838 } while (i); 839 } 840 pr_err("UASP: endpoint setup failed\n"); 841 return ret; 842 } 843 844 static void uasp_set_alt(struct f_uas *fu) 845 { 846 struct usb_function *f = &fu->function; 847 struct usb_gadget *gadget = f->config->cdev->gadget; 848 int ret; 849 850 fu->flags = USBG_IS_UAS; 851 852 if (gadget->speed >= USB_SPEED_SUPER) 853 fu->flags |= USBG_USE_STREAMS; 854 855 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS); 856 ret = usb_ep_enable(fu->ep_in); 857 if (ret) 858 goto err_b_in; 859 860 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS); 861 ret = usb_ep_enable(fu->ep_out); 862 if (ret) 863 goto err_b_out; 864 865 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS); 866 ret = usb_ep_enable(fu->ep_cmd); 867 if (ret) 868 goto err_cmd; 869 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS); 870 ret = usb_ep_enable(fu->ep_status); 871 if (ret) 872 goto err_status; 873 874 ret = uasp_prepare_reqs(fu); 875 if (ret) 876 goto err_wq; 877 fu->flags |= USBG_ENABLED; 878 879 pr_info("Using the UAS protocol\n"); 880 return; 881 err_wq: 882 usb_ep_disable(fu->ep_status); 883 err_status: 884 usb_ep_disable(fu->ep_cmd); 885 err_cmd: 886 usb_ep_disable(fu->ep_out); 887 err_b_out: 888 usb_ep_disable(fu->ep_in); 889 err_b_in: 890 fu->flags = 0; 891 } 892 893 static int get_cmd_dir(const unsigned char *cdb) 894 { 895 int ret; 896 897 switch (cdb[0]) { 898 case READ_6: 899 case READ_10: 900 case READ_12: 901 case READ_16: 902 case INQUIRY: 903 case MODE_SENSE: 904 case MODE_SENSE_10: 905 case SERVICE_ACTION_IN_16: 906 case MAINTENANCE_IN: 907 case PERSISTENT_RESERVE_IN: 908 case SECURITY_PROTOCOL_IN: 909 case ACCESS_CONTROL_IN: 910 case REPORT_LUNS: 911 case READ_BLOCK_LIMITS: 912 case READ_POSITION: 913 case READ_CAPACITY: 914 case READ_TOC: 915 case READ_FORMAT_CAPACITIES: 916 case REQUEST_SENSE: 917 ret = DMA_FROM_DEVICE; 918 break; 919 920 case WRITE_6: 921 case WRITE_10: 922 case WRITE_12: 923 case WRITE_16: 924 case MODE_SELECT: 925 case MODE_SELECT_10: 926 case WRITE_VERIFY: 927 case WRITE_VERIFY_12: 928 case PERSISTENT_RESERVE_OUT: 929 case MAINTENANCE_OUT: 930 case SECURITY_PROTOCOL_OUT: 931 case ACCESS_CONTROL_OUT: 932 ret = DMA_TO_DEVICE; 933 break; 934 case ALLOW_MEDIUM_REMOVAL: 935 case TEST_UNIT_READY: 936 case SYNCHRONIZE_CACHE: 937 case START_STOP: 938 case ERASE: 939 case REZERO_UNIT: 940 case SEEK_10: 941 case SPACE: 942 case VERIFY: 943 case WRITE_FILEMARKS: 944 ret = DMA_NONE; 945 break; 946 default: 947 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 948 pr_warn(CMD_DIR_MSG, cdb[0]); 949 #undef CMD_DIR_MSG 950 ret = -EINVAL; 951 } 952 return ret; 953 } 954 955 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 956 { 957 struct usbg_cmd *cmd = req->context; 958 struct se_cmd *se_cmd = &cmd->se_cmd; 959 960 if (req->status < 0) { 961 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 962 goto cleanup; 963 } 964 965 if (req->num_sgs == 0) { 966 sg_copy_from_buffer(se_cmd->t_data_sg, 967 se_cmd->t_data_nents, 968 cmd->data_buf, 969 se_cmd->data_length); 970 } 971 972 complete(&cmd->write_complete); 973 return; 974 975 cleanup: 976 transport_generic_free_cmd(&cmd->se_cmd, 0); 977 } 978 979 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 980 { 981 struct se_cmd *se_cmd = &cmd->se_cmd; 982 struct f_uas *fu = cmd->fu; 983 struct usb_gadget *gadget = fuas_to_gadget(fu); 984 985 if (!gadget->sg_supported) { 986 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 987 if (!cmd->data_buf) 988 return -ENOMEM; 989 990 req->buf = cmd->data_buf; 991 } else { 992 req->buf = NULL; 993 req->num_sgs = se_cmd->t_data_nents; 994 req->sg = se_cmd->t_data_sg; 995 } 996 997 req->is_last = 1; 998 req->complete = usbg_data_write_cmpl; 999 req->length = se_cmd->data_length; 1000 req->context = cmd; 1001 return 0; 1002 } 1003 1004 static int usbg_send_status_response(struct se_cmd *se_cmd) 1005 { 1006 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1007 se_cmd); 1008 struct f_uas *fu = cmd->fu; 1009 1010 if (fu->flags & USBG_IS_BOT) 1011 return bot_send_status_response(cmd); 1012 else 1013 return uasp_send_status_response(cmd); 1014 } 1015 1016 static int usbg_send_write_request(struct se_cmd *se_cmd) 1017 { 1018 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1019 se_cmd); 1020 struct f_uas *fu = cmd->fu; 1021 1022 if (fu->flags & USBG_IS_BOT) 1023 return bot_send_write_request(cmd); 1024 else 1025 return uasp_send_write_request(cmd); 1026 } 1027 1028 static int usbg_send_read_response(struct se_cmd *se_cmd) 1029 { 1030 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1031 se_cmd); 1032 struct f_uas *fu = cmd->fu; 1033 1034 if (fu->flags & USBG_IS_BOT) 1035 return bot_send_read_response(cmd); 1036 else 1037 return uasp_send_read_response(cmd); 1038 } 1039 1040 static void usbg_cmd_work(struct work_struct *work) 1041 { 1042 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1043 struct se_cmd *se_cmd; 1044 struct tcm_usbg_nexus *tv_nexus; 1045 struct usbg_tpg *tpg; 1046 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1047 1048 se_cmd = &cmd->se_cmd; 1049 tpg = cmd->fu->tpg; 1050 tv_nexus = tpg->tpg_nexus; 1051 dir = get_cmd_dir(cmd->cmd_buf); 1052 if (dir < 0) { 1053 transport_init_se_cmd(se_cmd, 1054 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1055 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1056 cmd->prio_attr, cmd->sense_iu.sense, 1057 cmd->unpacked_lun); 1058 goto out; 1059 } 1060 1061 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1062 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1063 cmd->prio_attr, dir, flags) < 0) 1064 goto out; 1065 1066 return; 1067 1068 out: 1069 transport_send_check_condition_and_sense(se_cmd, 1070 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1071 transport_generic_free_cmd(&cmd->se_cmd, 0); 1072 } 1073 1074 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1075 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1076 { 1077 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1078 struct usbg_cmd *cmd; 1079 int tag, cpu; 1080 1081 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1082 if (tag < 0) 1083 return ERR_PTR(-ENOMEM); 1084 1085 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1086 memset(cmd, 0, sizeof(*cmd)); 1087 cmd->se_cmd.map_tag = tag; 1088 cmd->se_cmd.map_cpu = cpu; 1089 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1090 cmd->fu = fu; 1091 1092 return cmd; 1093 } 1094 1095 static void usbg_release_cmd(struct se_cmd *); 1096 1097 static int usbg_submit_command(struct f_uas *fu, 1098 void *cmdbuf, unsigned int len) 1099 { 1100 struct command_iu *cmd_iu = cmdbuf; 1101 struct usbg_cmd *cmd; 1102 struct usbg_tpg *tpg = fu->tpg; 1103 struct tcm_usbg_nexus *tv_nexus; 1104 u32 cmd_len; 1105 u16 scsi_tag; 1106 1107 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1108 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1109 return -EINVAL; 1110 } 1111 1112 tv_nexus = tpg->tpg_nexus; 1113 if (!tv_nexus) { 1114 pr_err("Missing nexus, ignoring command\n"); 1115 return -EINVAL; 1116 } 1117 1118 cmd_len = (cmd_iu->len & ~0x3) + 16; 1119 if (cmd_len > USBG_MAX_CMD) 1120 return -EINVAL; 1121 1122 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1123 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1124 if (IS_ERR(cmd)) { 1125 pr_err("usbg_get_cmd failed\n"); 1126 return -ENOMEM; 1127 } 1128 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1129 1130 if (fu->flags & USBG_USE_STREAMS) { 1131 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) 1132 goto err; 1133 if (!cmd->tag) 1134 cmd->stream = &fu->stream[0]; 1135 else 1136 cmd->stream = &fu->stream[cmd->tag - 1]; 1137 } else { 1138 cmd->stream = &fu->stream[0]; 1139 } 1140 1141 switch (cmd_iu->prio_attr & 0x7) { 1142 case UAS_HEAD_TAG: 1143 cmd->prio_attr = TCM_HEAD_TAG; 1144 break; 1145 case UAS_ORDERED_TAG: 1146 cmd->prio_attr = TCM_ORDERED_TAG; 1147 break; 1148 case UAS_ACA: 1149 cmd->prio_attr = TCM_ACA_TAG; 1150 break; 1151 default: 1152 pr_debug_once("Unsupported prio_attr: %02x.\n", 1153 cmd_iu->prio_attr); 1154 fallthrough; 1155 case UAS_SIMPLE_TAG: 1156 cmd->prio_attr = TCM_SIMPLE_TAG; 1157 break; 1158 } 1159 1160 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1161 1162 INIT_WORK(&cmd->work, usbg_cmd_work); 1163 queue_work(tpg->workqueue, &cmd->work); 1164 1165 return 0; 1166 err: 1167 usbg_release_cmd(&cmd->se_cmd); 1168 return -EINVAL; 1169 } 1170 1171 static void bot_cmd_work(struct work_struct *work) 1172 { 1173 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1174 struct se_cmd *se_cmd; 1175 struct tcm_usbg_nexus *tv_nexus; 1176 struct usbg_tpg *tpg; 1177 int dir; 1178 1179 se_cmd = &cmd->se_cmd; 1180 tpg = cmd->fu->tpg; 1181 tv_nexus = tpg->tpg_nexus; 1182 dir = get_cmd_dir(cmd->cmd_buf); 1183 if (dir < 0) { 1184 transport_init_se_cmd(se_cmd, 1185 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1186 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1187 cmd->prio_attr, cmd->sense_iu.sense, 1188 cmd->unpacked_lun); 1189 goto out; 1190 } 1191 1192 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1193 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1194 cmd->data_len, cmd->prio_attr, dir, 0) < 0) 1195 goto out; 1196 1197 return; 1198 1199 out: 1200 transport_send_check_condition_and_sense(se_cmd, 1201 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1202 transport_generic_free_cmd(&cmd->se_cmd, 0); 1203 } 1204 1205 static int bot_submit_command(struct f_uas *fu, 1206 void *cmdbuf, unsigned int len) 1207 { 1208 struct bulk_cb_wrap *cbw = cmdbuf; 1209 struct usbg_cmd *cmd; 1210 struct usbg_tpg *tpg = fu->tpg; 1211 struct tcm_usbg_nexus *tv_nexus; 1212 u32 cmd_len; 1213 1214 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1215 pr_err("Wrong signature on CBW\n"); 1216 return -EINVAL; 1217 } 1218 if (len != 31) { 1219 pr_err("Wrong length for CBW\n"); 1220 return -EINVAL; 1221 } 1222 1223 cmd_len = cbw->Length; 1224 if (cmd_len < 1 || cmd_len > 16) 1225 return -EINVAL; 1226 1227 tv_nexus = tpg->tpg_nexus; 1228 if (!tv_nexus) { 1229 pr_err("Missing nexus, ignoring command\n"); 1230 return -ENODEV; 1231 } 1232 1233 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1234 if (IS_ERR(cmd)) { 1235 pr_err("usbg_get_cmd failed\n"); 1236 return -ENOMEM; 1237 } 1238 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1239 1240 cmd->bot_tag = cbw->Tag; 1241 cmd->prio_attr = TCM_SIMPLE_TAG; 1242 cmd->unpacked_lun = cbw->Lun; 1243 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1244 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1245 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1246 1247 INIT_WORK(&cmd->work, bot_cmd_work); 1248 queue_work(tpg->workqueue, &cmd->work); 1249 1250 return 0; 1251 } 1252 1253 /* Start fabric.c code */ 1254 1255 static int usbg_check_true(struct se_portal_group *se_tpg) 1256 { 1257 return 1; 1258 } 1259 1260 static int usbg_check_false(struct se_portal_group *se_tpg) 1261 { 1262 return 0; 1263 } 1264 1265 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1266 { 1267 struct usbg_tpg *tpg = container_of(se_tpg, 1268 struct usbg_tpg, se_tpg); 1269 struct usbg_tport *tport = tpg->tport; 1270 1271 return &tport->tport_name[0]; 1272 } 1273 1274 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1275 { 1276 struct usbg_tpg *tpg = container_of(se_tpg, 1277 struct usbg_tpg, se_tpg); 1278 return tpg->tport_tpgt; 1279 } 1280 1281 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg) 1282 { 1283 return 1; 1284 } 1285 1286 static void usbg_release_cmd(struct se_cmd *se_cmd) 1287 { 1288 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1289 se_cmd); 1290 struct se_session *se_sess = se_cmd->se_sess; 1291 1292 kfree(cmd->data_buf); 1293 target_free_tag(se_sess, se_cmd); 1294 } 1295 1296 static u32 usbg_sess_get_index(struct se_session *se_sess) 1297 { 1298 return 0; 1299 } 1300 1301 static void usbg_set_default_node_attrs(struct se_node_acl *nacl) 1302 { 1303 } 1304 1305 static int usbg_get_cmd_state(struct se_cmd *se_cmd) 1306 { 1307 return 0; 1308 } 1309 1310 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1311 { 1312 } 1313 1314 static void usbg_aborted_task(struct se_cmd *se_cmd) 1315 { 1316 } 1317 1318 static const char *usbg_check_wwn(const char *name) 1319 { 1320 const char *n; 1321 unsigned int len; 1322 1323 n = strstr(name, "naa."); 1324 if (!n) 1325 return NULL; 1326 n += 4; 1327 len = strlen(n); 1328 if (len == 0 || len > USBG_NAMELEN - 1) 1329 return NULL; 1330 return n; 1331 } 1332 1333 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1334 { 1335 if (!usbg_check_wwn(name)) 1336 return -EINVAL; 1337 return 0; 1338 } 1339 1340 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1341 const char *name) 1342 { 1343 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1344 tport_wwn); 1345 struct usbg_tpg *tpg; 1346 unsigned long tpgt; 1347 int ret; 1348 struct f_tcm_opts *opts; 1349 unsigned i; 1350 1351 if (strstr(name, "tpgt_") != name) 1352 return ERR_PTR(-EINVAL); 1353 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1354 return ERR_PTR(-EINVAL); 1355 ret = -ENODEV; 1356 mutex_lock(&tpg_instances_lock); 1357 for (i = 0; i < TPG_INSTANCES; ++i) 1358 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1359 break; 1360 if (i == TPG_INSTANCES) 1361 goto unlock_inst; 1362 1363 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1364 func_inst); 1365 mutex_lock(&opts->dep_lock); 1366 if (!opts->ready) 1367 goto unlock_dep; 1368 1369 if (opts->has_dep) { 1370 if (!try_module_get(opts->dependent)) 1371 goto unlock_dep; 1372 } else { 1373 ret = configfs_depend_item_unlocked( 1374 wwn->wwn_group.cg_subsys, 1375 &opts->func_inst.group.cg_item); 1376 if (ret) 1377 goto unlock_dep; 1378 } 1379 1380 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1381 ret = -ENOMEM; 1382 if (!tpg) 1383 goto unref_dep; 1384 mutex_init(&tpg->tpg_mutex); 1385 atomic_set(&tpg->tpg_port_count, 0); 1386 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1387 if (!tpg->workqueue) 1388 goto free_tpg; 1389 1390 tpg->tport = tport; 1391 tpg->tport_tpgt = tpgt; 1392 1393 /* 1394 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1395 * pretend to be SAS.. 1396 */ 1397 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1398 if (ret < 0) 1399 goto free_workqueue; 1400 1401 tpg_instances[i].tpg = tpg; 1402 tpg->fi = tpg_instances[i].func_inst; 1403 mutex_unlock(&opts->dep_lock); 1404 mutex_unlock(&tpg_instances_lock); 1405 return &tpg->se_tpg; 1406 1407 free_workqueue: 1408 destroy_workqueue(tpg->workqueue); 1409 free_tpg: 1410 kfree(tpg); 1411 unref_dep: 1412 if (opts->has_dep) 1413 module_put(opts->dependent); 1414 else 1415 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1416 unlock_dep: 1417 mutex_unlock(&opts->dep_lock); 1418 unlock_inst: 1419 mutex_unlock(&tpg_instances_lock); 1420 1421 return ERR_PTR(ret); 1422 } 1423 1424 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1425 1426 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1427 { 1428 struct usbg_tpg *tpg = container_of(se_tpg, 1429 struct usbg_tpg, se_tpg); 1430 unsigned i; 1431 struct f_tcm_opts *opts; 1432 1433 tcm_usbg_drop_nexus(tpg); 1434 core_tpg_deregister(se_tpg); 1435 destroy_workqueue(tpg->workqueue); 1436 1437 mutex_lock(&tpg_instances_lock); 1438 for (i = 0; i < TPG_INSTANCES; ++i) 1439 if (tpg_instances[i].tpg == tpg) 1440 break; 1441 if (i < TPG_INSTANCES) { 1442 tpg_instances[i].tpg = NULL; 1443 opts = container_of(tpg_instances[i].func_inst, 1444 struct f_tcm_opts, func_inst); 1445 mutex_lock(&opts->dep_lock); 1446 if (opts->has_dep) 1447 module_put(opts->dependent); 1448 else 1449 configfs_undepend_item_unlocked( 1450 &opts->func_inst.group.cg_item); 1451 mutex_unlock(&opts->dep_lock); 1452 } 1453 mutex_unlock(&tpg_instances_lock); 1454 1455 kfree(tpg); 1456 } 1457 1458 static struct se_wwn *usbg_make_tport( 1459 struct target_fabric_configfs *tf, 1460 struct config_group *group, 1461 const char *name) 1462 { 1463 struct usbg_tport *tport; 1464 const char *wnn_name; 1465 u64 wwpn = 0; 1466 1467 wnn_name = usbg_check_wwn(name); 1468 if (!wnn_name) 1469 return ERR_PTR(-EINVAL); 1470 1471 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1472 if (!(tport)) 1473 return ERR_PTR(-ENOMEM); 1474 1475 tport->tport_wwpn = wwpn; 1476 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1477 return &tport->tport_wwn; 1478 } 1479 1480 static void usbg_drop_tport(struct se_wwn *wwn) 1481 { 1482 struct usbg_tport *tport = container_of(wwn, 1483 struct usbg_tport, tport_wwn); 1484 kfree(tport); 1485 } 1486 1487 /* 1488 * If somebody feels like dropping the version property, go ahead. 1489 */ 1490 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1491 { 1492 return sprintf(page, "usb-gadget fabric module\n"); 1493 } 1494 1495 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1496 1497 static struct configfs_attribute *usbg_wwn_attrs[] = { 1498 &usbg_wwn_attr_version, 1499 NULL, 1500 }; 1501 1502 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page) 1503 { 1504 struct se_portal_group *se_tpg = to_tpg(item); 1505 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1506 1507 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect); 1508 } 1509 1510 static int usbg_attach(struct usbg_tpg *); 1511 static void usbg_detach(struct usbg_tpg *); 1512 1513 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item, 1514 const char *page, size_t count) 1515 { 1516 struct se_portal_group *se_tpg = to_tpg(item); 1517 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1518 bool op; 1519 ssize_t ret; 1520 1521 ret = strtobool(page, &op); 1522 if (ret) 1523 return ret; 1524 1525 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect)) 1526 return -EINVAL; 1527 1528 if (op) 1529 ret = usbg_attach(tpg); 1530 else 1531 usbg_detach(tpg); 1532 if (ret) 1533 return ret; 1534 1535 tpg->gadget_connect = op; 1536 1537 return count; 1538 } 1539 1540 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1541 { 1542 struct se_portal_group *se_tpg = to_tpg(item); 1543 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1544 struct tcm_usbg_nexus *tv_nexus; 1545 ssize_t ret; 1546 1547 mutex_lock(&tpg->tpg_mutex); 1548 tv_nexus = tpg->tpg_nexus; 1549 if (!tv_nexus) { 1550 ret = -ENODEV; 1551 goto out; 1552 } 1553 ret = snprintf(page, PAGE_SIZE, "%s\n", 1554 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1555 out: 1556 mutex_unlock(&tpg->tpg_mutex); 1557 return ret; 1558 } 1559 1560 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1561 struct se_session *se_sess, void *p) 1562 { 1563 struct usbg_tpg *tpg = container_of(se_tpg, 1564 struct usbg_tpg, se_tpg); 1565 1566 tpg->tpg_nexus = p; 1567 return 0; 1568 } 1569 1570 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1571 { 1572 struct tcm_usbg_nexus *tv_nexus; 1573 int ret = 0; 1574 1575 mutex_lock(&tpg->tpg_mutex); 1576 if (tpg->tpg_nexus) { 1577 ret = -EEXIST; 1578 pr_debug("tpg->tpg_nexus already exists\n"); 1579 goto out_unlock; 1580 } 1581 1582 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1583 if (!tv_nexus) { 1584 ret = -ENOMEM; 1585 goto out_unlock; 1586 } 1587 1588 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1589 USB_G_DEFAULT_SESSION_TAGS, 1590 sizeof(struct usbg_cmd), 1591 TARGET_PROT_NORMAL, name, 1592 tv_nexus, usbg_alloc_sess_cb); 1593 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1594 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1595 pr_debug(MAKE_NEXUS_MSG, name); 1596 #undef MAKE_NEXUS_MSG 1597 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1598 kfree(tv_nexus); 1599 } 1600 1601 out_unlock: 1602 mutex_unlock(&tpg->tpg_mutex); 1603 return ret; 1604 } 1605 1606 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1607 { 1608 struct se_session *se_sess; 1609 struct tcm_usbg_nexus *tv_nexus; 1610 int ret = -ENODEV; 1611 1612 mutex_lock(&tpg->tpg_mutex); 1613 tv_nexus = tpg->tpg_nexus; 1614 if (!tv_nexus) 1615 goto out; 1616 1617 se_sess = tv_nexus->tvn_se_sess; 1618 if (!se_sess) 1619 goto out; 1620 1621 if (atomic_read(&tpg->tpg_port_count)) { 1622 ret = -EPERM; 1623 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1624 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1625 #undef MSG 1626 goto out; 1627 } 1628 1629 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1630 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1631 /* 1632 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1633 */ 1634 target_remove_session(se_sess); 1635 tpg->tpg_nexus = NULL; 1636 1637 kfree(tv_nexus); 1638 ret = 0; 1639 out: 1640 mutex_unlock(&tpg->tpg_mutex); 1641 return ret; 1642 } 1643 1644 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1645 const char *page, size_t count) 1646 { 1647 struct se_portal_group *se_tpg = to_tpg(item); 1648 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1649 unsigned char i_port[USBG_NAMELEN], *ptr; 1650 int ret; 1651 1652 if (!strncmp(page, "NULL", 4)) { 1653 ret = tcm_usbg_drop_nexus(tpg); 1654 return (!ret) ? count : ret; 1655 } 1656 if (strlen(page) >= USBG_NAMELEN) { 1657 1658 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1659 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1660 #undef NEXUS_STORE_MSG 1661 return -EINVAL; 1662 } 1663 snprintf(i_port, USBG_NAMELEN, "%s", page); 1664 1665 ptr = strstr(i_port, "naa."); 1666 if (!ptr) { 1667 pr_err("Missing 'naa.' prefix\n"); 1668 return -EINVAL; 1669 } 1670 1671 if (i_port[strlen(i_port) - 1] == '\n') 1672 i_port[strlen(i_port) - 1] = '\0'; 1673 1674 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1675 if (ret < 0) 1676 return ret; 1677 return count; 1678 } 1679 1680 CONFIGFS_ATTR(tcm_usbg_tpg_, enable); 1681 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1682 1683 static struct configfs_attribute *usbg_base_attrs[] = { 1684 &tcm_usbg_tpg_attr_enable, 1685 &tcm_usbg_tpg_attr_nexus, 1686 NULL, 1687 }; 1688 1689 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1690 { 1691 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1692 1693 atomic_inc(&tpg->tpg_port_count); 1694 smp_mb__after_atomic(); 1695 return 0; 1696 } 1697 1698 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1699 struct se_lun *se_lun) 1700 { 1701 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1702 1703 atomic_dec(&tpg->tpg_port_count); 1704 smp_mb__after_atomic(); 1705 } 1706 1707 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1708 { 1709 return target_put_sess_cmd(se_cmd); 1710 } 1711 1712 static const struct target_core_fabric_ops usbg_ops = { 1713 .module = THIS_MODULE, 1714 .fabric_name = "usb_gadget", 1715 .tpg_get_wwn = usbg_get_fabric_wwn, 1716 .tpg_get_tag = usbg_get_tag, 1717 .tpg_check_demo_mode = usbg_check_true, 1718 .tpg_check_demo_mode_cache = usbg_check_false, 1719 .tpg_check_demo_mode_write_protect = usbg_check_false, 1720 .tpg_check_prod_mode_write_protect = usbg_check_false, 1721 .tpg_get_inst_index = usbg_tpg_get_inst_index, 1722 .release_cmd = usbg_release_cmd, 1723 .sess_get_index = usbg_sess_get_index, 1724 .sess_get_initiator_sid = NULL, 1725 .write_pending = usbg_send_write_request, 1726 .set_default_node_attributes = usbg_set_default_node_attrs, 1727 .get_cmd_state = usbg_get_cmd_state, 1728 .queue_data_in = usbg_send_read_response, 1729 .queue_status = usbg_send_status_response, 1730 .queue_tm_rsp = usbg_queue_tm_rsp, 1731 .aborted_task = usbg_aborted_task, 1732 .check_stop_free = usbg_check_stop_free, 1733 1734 .fabric_make_wwn = usbg_make_tport, 1735 .fabric_drop_wwn = usbg_drop_tport, 1736 .fabric_make_tpg = usbg_make_tpg, 1737 .fabric_drop_tpg = usbg_drop_tpg, 1738 .fabric_post_link = usbg_port_link, 1739 .fabric_pre_unlink = usbg_port_unlink, 1740 .fabric_init_nodeacl = usbg_init_nodeacl, 1741 1742 .tfc_wwn_attrs = usbg_wwn_attrs, 1743 .tfc_tpg_base_attrs = usbg_base_attrs, 1744 }; 1745 1746 /* Start gadget.c code */ 1747 1748 static struct usb_interface_descriptor bot_intf_desc = { 1749 .bLength = sizeof(bot_intf_desc), 1750 .bDescriptorType = USB_DT_INTERFACE, 1751 .bNumEndpoints = 2, 1752 .bAlternateSetting = USB_G_ALT_INT_BBB, 1753 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1754 .bInterfaceSubClass = USB_SC_SCSI, 1755 .bInterfaceProtocol = USB_PR_BULK, 1756 }; 1757 1758 static struct usb_interface_descriptor uasp_intf_desc = { 1759 .bLength = sizeof(uasp_intf_desc), 1760 .bDescriptorType = USB_DT_INTERFACE, 1761 .bNumEndpoints = 4, 1762 .bAlternateSetting = USB_G_ALT_INT_UAS, 1763 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1764 .bInterfaceSubClass = USB_SC_SCSI, 1765 .bInterfaceProtocol = USB_PR_UAS, 1766 }; 1767 1768 static struct usb_endpoint_descriptor uasp_bi_desc = { 1769 .bLength = USB_DT_ENDPOINT_SIZE, 1770 .bDescriptorType = USB_DT_ENDPOINT, 1771 .bEndpointAddress = USB_DIR_IN, 1772 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1773 .wMaxPacketSize = cpu_to_le16(512), 1774 }; 1775 1776 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1777 .bLength = USB_DT_ENDPOINT_SIZE, 1778 .bDescriptorType = USB_DT_ENDPOINT, 1779 .bEndpointAddress = USB_DIR_IN, 1780 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1781 }; 1782 1783 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1784 .bLength = sizeof(uasp_bi_pipe_desc), 1785 .bDescriptorType = USB_DT_PIPE_USAGE, 1786 .bPipeID = DATA_IN_PIPE_ID, 1787 }; 1788 1789 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1790 .bLength = USB_DT_ENDPOINT_SIZE, 1791 .bDescriptorType = USB_DT_ENDPOINT, 1792 .bEndpointAddress = USB_DIR_IN, 1793 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1794 .wMaxPacketSize = cpu_to_le16(1024), 1795 }; 1796 1797 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1798 .bLength = sizeof(uasp_bi_ep_comp_desc), 1799 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1800 .bMaxBurst = 0, 1801 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1802 .wBytesPerInterval = 0, 1803 }; 1804 1805 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1806 .bLength = sizeof(bot_bi_ep_comp_desc), 1807 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1808 .bMaxBurst = 0, 1809 }; 1810 1811 static struct usb_endpoint_descriptor uasp_bo_desc = { 1812 .bLength = USB_DT_ENDPOINT_SIZE, 1813 .bDescriptorType = USB_DT_ENDPOINT, 1814 .bEndpointAddress = USB_DIR_OUT, 1815 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1816 .wMaxPacketSize = cpu_to_le16(512), 1817 }; 1818 1819 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1820 .bLength = USB_DT_ENDPOINT_SIZE, 1821 .bDescriptorType = USB_DT_ENDPOINT, 1822 .bEndpointAddress = USB_DIR_OUT, 1823 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1824 }; 1825 1826 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1827 .bLength = sizeof(uasp_bo_pipe_desc), 1828 .bDescriptorType = USB_DT_PIPE_USAGE, 1829 .bPipeID = DATA_OUT_PIPE_ID, 1830 }; 1831 1832 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1833 .bLength = USB_DT_ENDPOINT_SIZE, 1834 .bDescriptorType = USB_DT_ENDPOINT, 1835 .bEndpointAddress = USB_DIR_OUT, 1836 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1837 .wMaxPacketSize = cpu_to_le16(0x400), 1838 }; 1839 1840 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1841 .bLength = sizeof(uasp_bo_ep_comp_desc), 1842 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1843 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1844 }; 1845 1846 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1847 .bLength = sizeof(bot_bo_ep_comp_desc), 1848 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1849 }; 1850 1851 static struct usb_endpoint_descriptor uasp_status_desc = { 1852 .bLength = USB_DT_ENDPOINT_SIZE, 1853 .bDescriptorType = USB_DT_ENDPOINT, 1854 .bEndpointAddress = USB_DIR_IN, 1855 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1856 .wMaxPacketSize = cpu_to_le16(512), 1857 }; 1858 1859 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1860 .bLength = USB_DT_ENDPOINT_SIZE, 1861 .bDescriptorType = USB_DT_ENDPOINT, 1862 .bEndpointAddress = USB_DIR_IN, 1863 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1864 }; 1865 1866 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1867 .bLength = sizeof(uasp_status_pipe_desc), 1868 .bDescriptorType = USB_DT_PIPE_USAGE, 1869 .bPipeID = STATUS_PIPE_ID, 1870 }; 1871 1872 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1873 .bLength = USB_DT_ENDPOINT_SIZE, 1874 .bDescriptorType = USB_DT_ENDPOINT, 1875 .bEndpointAddress = USB_DIR_IN, 1876 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1877 .wMaxPacketSize = cpu_to_le16(1024), 1878 }; 1879 1880 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1881 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1882 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1883 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1884 }; 1885 1886 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1887 .bLength = USB_DT_ENDPOINT_SIZE, 1888 .bDescriptorType = USB_DT_ENDPOINT, 1889 .bEndpointAddress = USB_DIR_OUT, 1890 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1891 .wMaxPacketSize = cpu_to_le16(512), 1892 }; 1893 1894 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1895 .bLength = USB_DT_ENDPOINT_SIZE, 1896 .bDescriptorType = USB_DT_ENDPOINT, 1897 .bEndpointAddress = USB_DIR_OUT, 1898 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1899 }; 1900 1901 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1902 .bLength = sizeof(uasp_cmd_pipe_desc), 1903 .bDescriptorType = USB_DT_PIPE_USAGE, 1904 .bPipeID = CMD_PIPE_ID, 1905 }; 1906 1907 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1908 .bLength = USB_DT_ENDPOINT_SIZE, 1909 .bDescriptorType = USB_DT_ENDPOINT, 1910 .bEndpointAddress = USB_DIR_OUT, 1911 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1912 .wMaxPacketSize = cpu_to_le16(1024), 1913 }; 1914 1915 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1916 .bLength = sizeof(uasp_cmd_comp_desc), 1917 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1918 }; 1919 1920 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1921 (struct usb_descriptor_header *) &bot_intf_desc, 1922 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1923 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1924 1925 (struct usb_descriptor_header *) &uasp_intf_desc, 1926 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1927 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1928 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1929 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1930 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1931 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1932 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1933 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1934 NULL, 1935 }; 1936 1937 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1938 (struct usb_descriptor_header *) &bot_intf_desc, 1939 (struct usb_descriptor_header *) &uasp_bi_desc, 1940 (struct usb_descriptor_header *) &uasp_bo_desc, 1941 1942 (struct usb_descriptor_header *) &uasp_intf_desc, 1943 (struct usb_descriptor_header *) &uasp_bi_desc, 1944 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1945 (struct usb_descriptor_header *) &uasp_bo_desc, 1946 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1947 (struct usb_descriptor_header *) &uasp_status_desc, 1948 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1949 (struct usb_descriptor_header *) &uasp_cmd_desc, 1950 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1951 NULL, 1952 }; 1953 1954 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1955 (struct usb_descriptor_header *) &bot_intf_desc, 1956 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1957 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1958 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1959 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1960 1961 (struct usb_descriptor_header *) &uasp_intf_desc, 1962 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1963 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1964 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1965 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1966 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1967 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1968 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1969 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1970 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1971 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1972 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1973 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1974 NULL, 1975 }; 1976 1977 static struct usb_string tcm_us_strings[] = { 1978 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1979 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1980 { }, 1981 }; 1982 1983 static struct usb_gadget_strings tcm_stringtab = { 1984 .language = 0x0409, 1985 .strings = tcm_us_strings, 1986 }; 1987 1988 static struct usb_gadget_strings *tcm_strings[] = { 1989 &tcm_stringtab, 1990 NULL, 1991 }; 1992 1993 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1994 { 1995 struct f_uas *fu = to_f_uas(f); 1996 struct usb_string *us; 1997 struct usb_gadget *gadget = c->cdev->gadget; 1998 struct usb_ep *ep; 1999 struct f_tcm_opts *opts; 2000 int iface; 2001 int ret; 2002 2003 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 2004 2005 mutex_lock(&opts->dep_lock); 2006 if (!opts->can_attach) { 2007 mutex_unlock(&opts->dep_lock); 2008 return -ENODEV; 2009 } 2010 mutex_unlock(&opts->dep_lock); 2011 us = usb_gstrings_attach(c->cdev, tcm_strings, 2012 ARRAY_SIZE(tcm_us_strings)); 2013 if (IS_ERR(us)) 2014 return PTR_ERR(us); 2015 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 2016 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 2017 2018 iface = usb_interface_id(c, f); 2019 if (iface < 0) 2020 return iface; 2021 2022 bot_intf_desc.bInterfaceNumber = iface; 2023 uasp_intf_desc.bInterfaceNumber = iface; 2024 fu->iface = iface; 2025 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 2026 &uasp_bi_ep_comp_desc); 2027 if (!ep) 2028 goto ep_fail; 2029 2030 fu->ep_in = ep; 2031 2032 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 2033 &uasp_bo_ep_comp_desc); 2034 if (!ep) 2035 goto ep_fail; 2036 fu->ep_out = ep; 2037 2038 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 2039 &uasp_status_in_ep_comp_desc); 2040 if (!ep) 2041 goto ep_fail; 2042 fu->ep_status = ep; 2043 2044 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 2045 &uasp_cmd_comp_desc); 2046 if (!ep) 2047 goto ep_fail; 2048 fu->ep_cmd = ep; 2049 2050 /* Assume endpoint addresses are the same for both speeds */ 2051 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2052 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2053 uasp_status_desc.bEndpointAddress = 2054 uasp_ss_status_desc.bEndpointAddress; 2055 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2056 2057 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2058 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2059 uasp_fs_status_desc.bEndpointAddress = 2060 uasp_ss_status_desc.bEndpointAddress; 2061 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2062 2063 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2064 uasp_hs_function_desc, uasp_ss_function_desc, NULL); 2065 if (ret) 2066 goto ep_fail; 2067 2068 return 0; 2069 ep_fail: 2070 pr_err("Can't claim all required eps\n"); 2071 2072 return -ENOTSUPP; 2073 } 2074 2075 struct guas_setup_wq { 2076 struct work_struct work; 2077 struct f_uas *fu; 2078 unsigned int alt; 2079 }; 2080 2081 static void tcm_delayed_set_alt(struct work_struct *wq) 2082 { 2083 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2084 work); 2085 struct f_uas *fu = work->fu; 2086 int alt = work->alt; 2087 2088 kfree(work); 2089 2090 if (fu->flags & USBG_IS_BOT) 2091 bot_cleanup_old_alt(fu); 2092 if (fu->flags & USBG_IS_UAS) 2093 uasp_cleanup_old_alt(fu); 2094 2095 if (alt == USB_G_ALT_INT_BBB) 2096 bot_set_alt(fu); 2097 else if (alt == USB_G_ALT_INT_UAS) 2098 uasp_set_alt(fu); 2099 usb_composite_setup_continue(fu->function.config->cdev); 2100 } 2101 2102 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2103 { 2104 if (intf == bot_intf_desc.bInterfaceNumber) 2105 return USB_G_ALT_INT_BBB; 2106 if (intf == uasp_intf_desc.bInterfaceNumber) 2107 return USB_G_ALT_INT_UAS; 2108 2109 return -EOPNOTSUPP; 2110 } 2111 2112 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2113 { 2114 struct f_uas *fu = to_f_uas(f); 2115 2116 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2117 struct guas_setup_wq *work; 2118 2119 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2120 if (!work) 2121 return -ENOMEM; 2122 INIT_WORK(&work->work, tcm_delayed_set_alt); 2123 work->fu = fu; 2124 work->alt = alt; 2125 schedule_work(&work->work); 2126 return USB_GADGET_DELAYED_STATUS; 2127 } 2128 return -EOPNOTSUPP; 2129 } 2130 2131 static void tcm_disable(struct usb_function *f) 2132 { 2133 struct f_uas *fu = to_f_uas(f); 2134 2135 if (fu->flags & USBG_IS_UAS) 2136 uasp_cleanup_old_alt(fu); 2137 else if (fu->flags & USBG_IS_BOT) 2138 bot_cleanup_old_alt(fu); 2139 fu->flags = 0; 2140 } 2141 2142 static int tcm_setup(struct usb_function *f, 2143 const struct usb_ctrlrequest *ctrl) 2144 { 2145 struct f_uas *fu = to_f_uas(f); 2146 2147 if (!(fu->flags & USBG_IS_BOT)) 2148 return -EOPNOTSUPP; 2149 2150 return usbg_bot_setup(f, ctrl); 2151 } 2152 2153 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2154 { 2155 return container_of(to_config_group(item), struct f_tcm_opts, 2156 func_inst.group); 2157 } 2158 2159 static void tcm_attr_release(struct config_item *item) 2160 { 2161 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2162 2163 usb_put_function_instance(&opts->func_inst); 2164 } 2165 2166 static struct configfs_item_operations tcm_item_ops = { 2167 .release = tcm_attr_release, 2168 }; 2169 2170 static const struct config_item_type tcm_func_type = { 2171 .ct_item_ops = &tcm_item_ops, 2172 .ct_owner = THIS_MODULE, 2173 }; 2174 2175 static void tcm_free_inst(struct usb_function_instance *f) 2176 { 2177 struct f_tcm_opts *opts; 2178 unsigned i; 2179 2180 opts = container_of(f, struct f_tcm_opts, func_inst); 2181 2182 mutex_lock(&tpg_instances_lock); 2183 for (i = 0; i < TPG_INSTANCES; ++i) 2184 if (tpg_instances[i].func_inst == f) 2185 break; 2186 if (i < TPG_INSTANCES) 2187 tpg_instances[i].func_inst = NULL; 2188 mutex_unlock(&tpg_instances_lock); 2189 2190 kfree(opts); 2191 } 2192 2193 static int tcm_register_callback(struct usb_function_instance *f) 2194 { 2195 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2196 2197 mutex_lock(&opts->dep_lock); 2198 opts->can_attach = true; 2199 mutex_unlock(&opts->dep_lock); 2200 2201 return 0; 2202 } 2203 2204 static void tcm_unregister_callback(struct usb_function_instance *f) 2205 { 2206 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2207 2208 mutex_lock(&opts->dep_lock); 2209 unregister_gadget_item(opts-> 2210 func_inst.group.cg_item.ci_parent->ci_parent); 2211 opts->can_attach = false; 2212 mutex_unlock(&opts->dep_lock); 2213 } 2214 2215 static int usbg_attach(struct usbg_tpg *tpg) 2216 { 2217 struct usb_function_instance *f = tpg->fi; 2218 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2219 2220 if (opts->tcm_register_callback) 2221 return opts->tcm_register_callback(f); 2222 2223 return 0; 2224 } 2225 2226 static void usbg_detach(struct usbg_tpg *tpg) 2227 { 2228 struct usb_function_instance *f = tpg->fi; 2229 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2230 2231 if (opts->tcm_unregister_callback) 2232 opts->tcm_unregister_callback(f); 2233 } 2234 2235 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2236 { 2237 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2238 2239 pr_debug("tcm: Activating %s\n", name); 2240 2241 mutex_lock(&opts->dep_lock); 2242 opts->ready = true; 2243 mutex_unlock(&opts->dep_lock); 2244 2245 return 0; 2246 } 2247 2248 static struct usb_function_instance *tcm_alloc_inst(void) 2249 { 2250 struct f_tcm_opts *opts; 2251 int i; 2252 2253 2254 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2255 if (!opts) 2256 return ERR_PTR(-ENOMEM); 2257 2258 mutex_lock(&tpg_instances_lock); 2259 for (i = 0; i < TPG_INSTANCES; ++i) 2260 if (!tpg_instances[i].func_inst) 2261 break; 2262 2263 if (i == TPG_INSTANCES) { 2264 mutex_unlock(&tpg_instances_lock); 2265 kfree(opts); 2266 return ERR_PTR(-EBUSY); 2267 } 2268 tpg_instances[i].func_inst = &opts->func_inst; 2269 mutex_unlock(&tpg_instances_lock); 2270 2271 mutex_init(&opts->dep_lock); 2272 opts->func_inst.set_inst_name = tcm_set_name; 2273 opts->func_inst.free_func_inst = tcm_free_inst; 2274 opts->tcm_register_callback = tcm_register_callback; 2275 opts->tcm_unregister_callback = tcm_unregister_callback; 2276 2277 config_group_init_type_name(&opts->func_inst.group, "", 2278 &tcm_func_type); 2279 2280 return &opts->func_inst; 2281 } 2282 2283 static void tcm_free(struct usb_function *f) 2284 { 2285 struct f_uas *tcm = to_f_uas(f); 2286 2287 kfree(tcm); 2288 } 2289 2290 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2291 { 2292 usb_free_all_descriptors(f); 2293 } 2294 2295 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2296 { 2297 struct f_uas *fu; 2298 unsigned i; 2299 2300 mutex_lock(&tpg_instances_lock); 2301 for (i = 0; i < TPG_INSTANCES; ++i) 2302 if (tpg_instances[i].func_inst == fi) 2303 break; 2304 if (i == TPG_INSTANCES) { 2305 mutex_unlock(&tpg_instances_lock); 2306 return ERR_PTR(-ENODEV); 2307 } 2308 2309 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2310 if (!fu) { 2311 mutex_unlock(&tpg_instances_lock); 2312 return ERR_PTR(-ENOMEM); 2313 } 2314 2315 fu->function.name = "Target Function"; 2316 fu->function.bind = tcm_bind; 2317 fu->function.unbind = tcm_unbind; 2318 fu->function.set_alt = tcm_set_alt; 2319 fu->function.get_alt = tcm_get_alt; 2320 fu->function.setup = tcm_setup; 2321 fu->function.disable = tcm_disable; 2322 fu->function.free_func = tcm_free; 2323 fu->tpg = tpg_instances[i].tpg; 2324 mutex_unlock(&tpg_instances_lock); 2325 2326 return &fu->function; 2327 } 2328 2329 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2330 2331 static int tcm_init(void) 2332 { 2333 int ret; 2334 2335 ret = usb_function_register(&tcmusb_func); 2336 if (ret) 2337 return ret; 2338 2339 ret = target_register_template(&usbg_ops); 2340 if (ret) 2341 usb_function_unregister(&tcmusb_func); 2342 2343 return ret; 2344 } 2345 module_init(tcm_init); 2346 2347 static void tcm_exit(void) 2348 { 2349 target_unregister_template(&usbg_ops); 2350 usb_function_unregister(&tcmusb_func); 2351 } 2352 module_exit(tcm_exit); 2353 2354 MODULE_LICENSE("GPL"); 2355 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2356