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 __target_init_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 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); 1064 return; 1065 1066 out: 1067 transport_send_check_condition_and_sense(se_cmd, 1068 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1069 transport_generic_free_cmd(&cmd->se_cmd, 0); 1070 } 1071 1072 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1073 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1074 { 1075 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1076 struct usbg_cmd *cmd; 1077 int tag, cpu; 1078 1079 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1080 if (tag < 0) 1081 return ERR_PTR(-ENOMEM); 1082 1083 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1084 memset(cmd, 0, sizeof(*cmd)); 1085 cmd->se_cmd.map_tag = tag; 1086 cmd->se_cmd.map_cpu = cpu; 1087 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1088 cmd->fu = fu; 1089 1090 return cmd; 1091 } 1092 1093 static void usbg_release_cmd(struct se_cmd *); 1094 1095 static int usbg_submit_command(struct f_uas *fu, 1096 void *cmdbuf, unsigned int len) 1097 { 1098 struct command_iu *cmd_iu = cmdbuf; 1099 struct usbg_cmd *cmd; 1100 struct usbg_tpg *tpg = fu->tpg; 1101 struct tcm_usbg_nexus *tv_nexus; 1102 u32 cmd_len; 1103 u16 scsi_tag; 1104 1105 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1106 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1107 return -EINVAL; 1108 } 1109 1110 tv_nexus = tpg->tpg_nexus; 1111 if (!tv_nexus) { 1112 pr_err("Missing nexus, ignoring command\n"); 1113 return -EINVAL; 1114 } 1115 1116 cmd_len = (cmd_iu->len & ~0x3) + 16; 1117 if (cmd_len > USBG_MAX_CMD) 1118 return -EINVAL; 1119 1120 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1121 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1122 if (IS_ERR(cmd)) { 1123 pr_err("usbg_get_cmd failed\n"); 1124 return -ENOMEM; 1125 } 1126 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1127 1128 if (fu->flags & USBG_USE_STREAMS) { 1129 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) 1130 goto err; 1131 if (!cmd->tag) 1132 cmd->stream = &fu->stream[0]; 1133 else 1134 cmd->stream = &fu->stream[cmd->tag - 1]; 1135 } else { 1136 cmd->stream = &fu->stream[0]; 1137 } 1138 1139 switch (cmd_iu->prio_attr & 0x7) { 1140 case UAS_HEAD_TAG: 1141 cmd->prio_attr = TCM_HEAD_TAG; 1142 break; 1143 case UAS_ORDERED_TAG: 1144 cmd->prio_attr = TCM_ORDERED_TAG; 1145 break; 1146 case UAS_ACA: 1147 cmd->prio_attr = TCM_ACA_TAG; 1148 break; 1149 default: 1150 pr_debug_once("Unsupported prio_attr: %02x.\n", 1151 cmd_iu->prio_attr); 1152 fallthrough; 1153 case UAS_SIMPLE_TAG: 1154 cmd->prio_attr = TCM_SIMPLE_TAG; 1155 break; 1156 } 1157 1158 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1159 1160 INIT_WORK(&cmd->work, usbg_cmd_work); 1161 queue_work(tpg->workqueue, &cmd->work); 1162 1163 return 0; 1164 err: 1165 usbg_release_cmd(&cmd->se_cmd); 1166 return -EINVAL; 1167 } 1168 1169 static void bot_cmd_work(struct work_struct *work) 1170 { 1171 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1172 struct se_cmd *se_cmd; 1173 struct tcm_usbg_nexus *tv_nexus; 1174 struct usbg_tpg *tpg; 1175 int dir; 1176 1177 se_cmd = &cmd->se_cmd; 1178 tpg = cmd->fu->tpg; 1179 tv_nexus = tpg->tpg_nexus; 1180 dir = get_cmd_dir(cmd->cmd_buf); 1181 if (dir < 0) { 1182 __target_init_cmd(se_cmd, 1183 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1184 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1185 cmd->prio_attr, cmd->sense_iu.sense, 1186 cmd->unpacked_lun); 1187 goto out; 1188 } 1189 1190 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1191 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1192 cmd->data_len, cmd->prio_attr, dir, 0); 1193 return; 1194 1195 out: 1196 transport_send_check_condition_and_sense(se_cmd, 1197 TCM_UNSUPPORTED_SCSI_OPCODE, 1); 1198 transport_generic_free_cmd(&cmd->se_cmd, 0); 1199 } 1200 1201 static int bot_submit_command(struct f_uas *fu, 1202 void *cmdbuf, unsigned int len) 1203 { 1204 struct bulk_cb_wrap *cbw = cmdbuf; 1205 struct usbg_cmd *cmd; 1206 struct usbg_tpg *tpg = fu->tpg; 1207 struct tcm_usbg_nexus *tv_nexus; 1208 u32 cmd_len; 1209 1210 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1211 pr_err("Wrong signature on CBW\n"); 1212 return -EINVAL; 1213 } 1214 if (len != 31) { 1215 pr_err("Wrong length for CBW\n"); 1216 return -EINVAL; 1217 } 1218 1219 cmd_len = cbw->Length; 1220 if (cmd_len < 1 || cmd_len > 16) 1221 return -EINVAL; 1222 1223 tv_nexus = tpg->tpg_nexus; 1224 if (!tv_nexus) { 1225 pr_err("Missing nexus, ignoring command\n"); 1226 return -ENODEV; 1227 } 1228 1229 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1230 if (IS_ERR(cmd)) { 1231 pr_err("usbg_get_cmd failed\n"); 1232 return -ENOMEM; 1233 } 1234 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1235 1236 cmd->bot_tag = cbw->Tag; 1237 cmd->prio_attr = TCM_SIMPLE_TAG; 1238 cmd->unpacked_lun = cbw->Lun; 1239 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1240 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1241 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1242 1243 INIT_WORK(&cmd->work, bot_cmd_work); 1244 queue_work(tpg->workqueue, &cmd->work); 1245 1246 return 0; 1247 } 1248 1249 /* Start fabric.c code */ 1250 1251 static int usbg_check_true(struct se_portal_group *se_tpg) 1252 { 1253 return 1; 1254 } 1255 1256 static int usbg_check_false(struct se_portal_group *se_tpg) 1257 { 1258 return 0; 1259 } 1260 1261 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1262 { 1263 struct usbg_tpg *tpg = container_of(se_tpg, 1264 struct usbg_tpg, se_tpg); 1265 struct usbg_tport *tport = tpg->tport; 1266 1267 return &tport->tport_name[0]; 1268 } 1269 1270 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1271 { 1272 struct usbg_tpg *tpg = container_of(se_tpg, 1273 struct usbg_tpg, se_tpg); 1274 return tpg->tport_tpgt; 1275 } 1276 1277 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg) 1278 { 1279 return 1; 1280 } 1281 1282 static void usbg_release_cmd(struct se_cmd *se_cmd) 1283 { 1284 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1285 se_cmd); 1286 struct se_session *se_sess = se_cmd->se_sess; 1287 1288 kfree(cmd->data_buf); 1289 target_free_tag(se_sess, se_cmd); 1290 } 1291 1292 static u32 usbg_sess_get_index(struct se_session *se_sess) 1293 { 1294 return 0; 1295 } 1296 1297 static void usbg_set_default_node_attrs(struct se_node_acl *nacl) 1298 { 1299 } 1300 1301 static int usbg_get_cmd_state(struct se_cmd *se_cmd) 1302 { 1303 return 0; 1304 } 1305 1306 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1307 { 1308 } 1309 1310 static void usbg_aborted_task(struct se_cmd *se_cmd) 1311 { 1312 } 1313 1314 static const char *usbg_check_wwn(const char *name) 1315 { 1316 const char *n; 1317 unsigned int len; 1318 1319 n = strstr(name, "naa."); 1320 if (!n) 1321 return NULL; 1322 n += 4; 1323 len = strlen(n); 1324 if (len == 0 || len > USBG_NAMELEN - 1) 1325 return NULL; 1326 return n; 1327 } 1328 1329 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1330 { 1331 if (!usbg_check_wwn(name)) 1332 return -EINVAL; 1333 return 0; 1334 } 1335 1336 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1337 const char *name) 1338 { 1339 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1340 tport_wwn); 1341 struct usbg_tpg *tpg; 1342 unsigned long tpgt; 1343 int ret; 1344 struct f_tcm_opts *opts; 1345 unsigned i; 1346 1347 if (strstr(name, "tpgt_") != name) 1348 return ERR_PTR(-EINVAL); 1349 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1350 return ERR_PTR(-EINVAL); 1351 ret = -ENODEV; 1352 mutex_lock(&tpg_instances_lock); 1353 for (i = 0; i < TPG_INSTANCES; ++i) 1354 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1355 break; 1356 if (i == TPG_INSTANCES) 1357 goto unlock_inst; 1358 1359 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1360 func_inst); 1361 mutex_lock(&opts->dep_lock); 1362 if (!opts->ready) 1363 goto unlock_dep; 1364 1365 if (opts->has_dep) { 1366 if (!try_module_get(opts->dependent)) 1367 goto unlock_dep; 1368 } else { 1369 ret = configfs_depend_item_unlocked( 1370 wwn->wwn_group.cg_subsys, 1371 &opts->func_inst.group.cg_item); 1372 if (ret) 1373 goto unlock_dep; 1374 } 1375 1376 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1377 ret = -ENOMEM; 1378 if (!tpg) 1379 goto unref_dep; 1380 mutex_init(&tpg->tpg_mutex); 1381 atomic_set(&tpg->tpg_port_count, 0); 1382 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1383 if (!tpg->workqueue) 1384 goto free_tpg; 1385 1386 tpg->tport = tport; 1387 tpg->tport_tpgt = tpgt; 1388 1389 /* 1390 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1391 * pretend to be SAS.. 1392 */ 1393 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1394 if (ret < 0) 1395 goto free_workqueue; 1396 1397 tpg_instances[i].tpg = tpg; 1398 tpg->fi = tpg_instances[i].func_inst; 1399 mutex_unlock(&opts->dep_lock); 1400 mutex_unlock(&tpg_instances_lock); 1401 return &tpg->se_tpg; 1402 1403 free_workqueue: 1404 destroy_workqueue(tpg->workqueue); 1405 free_tpg: 1406 kfree(tpg); 1407 unref_dep: 1408 if (opts->has_dep) 1409 module_put(opts->dependent); 1410 else 1411 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1412 unlock_dep: 1413 mutex_unlock(&opts->dep_lock); 1414 unlock_inst: 1415 mutex_unlock(&tpg_instances_lock); 1416 1417 return ERR_PTR(ret); 1418 } 1419 1420 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1421 1422 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1423 { 1424 struct usbg_tpg *tpg = container_of(se_tpg, 1425 struct usbg_tpg, se_tpg); 1426 unsigned i; 1427 struct f_tcm_opts *opts; 1428 1429 tcm_usbg_drop_nexus(tpg); 1430 core_tpg_deregister(se_tpg); 1431 destroy_workqueue(tpg->workqueue); 1432 1433 mutex_lock(&tpg_instances_lock); 1434 for (i = 0; i < TPG_INSTANCES; ++i) 1435 if (tpg_instances[i].tpg == tpg) 1436 break; 1437 if (i < TPG_INSTANCES) { 1438 tpg_instances[i].tpg = NULL; 1439 opts = container_of(tpg_instances[i].func_inst, 1440 struct f_tcm_opts, func_inst); 1441 mutex_lock(&opts->dep_lock); 1442 if (opts->has_dep) 1443 module_put(opts->dependent); 1444 else 1445 configfs_undepend_item_unlocked( 1446 &opts->func_inst.group.cg_item); 1447 mutex_unlock(&opts->dep_lock); 1448 } 1449 mutex_unlock(&tpg_instances_lock); 1450 1451 kfree(tpg); 1452 } 1453 1454 static struct se_wwn *usbg_make_tport( 1455 struct target_fabric_configfs *tf, 1456 struct config_group *group, 1457 const char *name) 1458 { 1459 struct usbg_tport *tport; 1460 const char *wnn_name; 1461 u64 wwpn = 0; 1462 1463 wnn_name = usbg_check_wwn(name); 1464 if (!wnn_name) 1465 return ERR_PTR(-EINVAL); 1466 1467 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1468 if (!(tport)) 1469 return ERR_PTR(-ENOMEM); 1470 1471 tport->tport_wwpn = wwpn; 1472 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1473 return &tport->tport_wwn; 1474 } 1475 1476 static void usbg_drop_tport(struct se_wwn *wwn) 1477 { 1478 struct usbg_tport *tport = container_of(wwn, 1479 struct usbg_tport, tport_wwn); 1480 kfree(tport); 1481 } 1482 1483 /* 1484 * If somebody feels like dropping the version property, go ahead. 1485 */ 1486 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1487 { 1488 return sprintf(page, "usb-gadget fabric module\n"); 1489 } 1490 1491 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1492 1493 static struct configfs_attribute *usbg_wwn_attrs[] = { 1494 &usbg_wwn_attr_version, 1495 NULL, 1496 }; 1497 1498 static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page) 1499 { 1500 struct se_portal_group *se_tpg = to_tpg(item); 1501 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1502 1503 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect); 1504 } 1505 1506 static int usbg_attach(struct usbg_tpg *); 1507 static void usbg_detach(struct usbg_tpg *); 1508 1509 static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item, 1510 const char *page, size_t count) 1511 { 1512 struct se_portal_group *se_tpg = to_tpg(item); 1513 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1514 bool op; 1515 ssize_t ret; 1516 1517 ret = strtobool(page, &op); 1518 if (ret) 1519 return ret; 1520 1521 if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect)) 1522 return -EINVAL; 1523 1524 if (op) 1525 ret = usbg_attach(tpg); 1526 else 1527 usbg_detach(tpg); 1528 if (ret) 1529 return ret; 1530 1531 tpg->gadget_connect = op; 1532 1533 return count; 1534 } 1535 1536 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1537 { 1538 struct se_portal_group *se_tpg = to_tpg(item); 1539 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1540 struct tcm_usbg_nexus *tv_nexus; 1541 ssize_t ret; 1542 1543 mutex_lock(&tpg->tpg_mutex); 1544 tv_nexus = tpg->tpg_nexus; 1545 if (!tv_nexus) { 1546 ret = -ENODEV; 1547 goto out; 1548 } 1549 ret = snprintf(page, PAGE_SIZE, "%s\n", 1550 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1551 out: 1552 mutex_unlock(&tpg->tpg_mutex); 1553 return ret; 1554 } 1555 1556 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1557 struct se_session *se_sess, void *p) 1558 { 1559 struct usbg_tpg *tpg = container_of(se_tpg, 1560 struct usbg_tpg, se_tpg); 1561 1562 tpg->tpg_nexus = p; 1563 return 0; 1564 } 1565 1566 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1567 { 1568 struct tcm_usbg_nexus *tv_nexus; 1569 int ret = 0; 1570 1571 mutex_lock(&tpg->tpg_mutex); 1572 if (tpg->tpg_nexus) { 1573 ret = -EEXIST; 1574 pr_debug("tpg->tpg_nexus already exists\n"); 1575 goto out_unlock; 1576 } 1577 1578 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1579 if (!tv_nexus) { 1580 ret = -ENOMEM; 1581 goto out_unlock; 1582 } 1583 1584 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1585 USB_G_DEFAULT_SESSION_TAGS, 1586 sizeof(struct usbg_cmd), 1587 TARGET_PROT_NORMAL, name, 1588 tv_nexus, usbg_alloc_sess_cb); 1589 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1590 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1591 pr_debug(MAKE_NEXUS_MSG, name); 1592 #undef MAKE_NEXUS_MSG 1593 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1594 kfree(tv_nexus); 1595 } 1596 1597 out_unlock: 1598 mutex_unlock(&tpg->tpg_mutex); 1599 return ret; 1600 } 1601 1602 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1603 { 1604 struct se_session *se_sess; 1605 struct tcm_usbg_nexus *tv_nexus; 1606 int ret = -ENODEV; 1607 1608 mutex_lock(&tpg->tpg_mutex); 1609 tv_nexus = tpg->tpg_nexus; 1610 if (!tv_nexus) 1611 goto out; 1612 1613 se_sess = tv_nexus->tvn_se_sess; 1614 if (!se_sess) 1615 goto out; 1616 1617 if (atomic_read(&tpg->tpg_port_count)) { 1618 ret = -EPERM; 1619 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1620 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1621 #undef MSG 1622 goto out; 1623 } 1624 1625 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1626 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1627 /* 1628 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1629 */ 1630 target_remove_session(se_sess); 1631 tpg->tpg_nexus = NULL; 1632 1633 kfree(tv_nexus); 1634 ret = 0; 1635 out: 1636 mutex_unlock(&tpg->tpg_mutex); 1637 return ret; 1638 } 1639 1640 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1641 const char *page, size_t count) 1642 { 1643 struct se_portal_group *se_tpg = to_tpg(item); 1644 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1645 unsigned char i_port[USBG_NAMELEN], *ptr; 1646 int ret; 1647 1648 if (!strncmp(page, "NULL", 4)) { 1649 ret = tcm_usbg_drop_nexus(tpg); 1650 return (!ret) ? count : ret; 1651 } 1652 if (strlen(page) >= USBG_NAMELEN) { 1653 1654 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1655 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1656 #undef NEXUS_STORE_MSG 1657 return -EINVAL; 1658 } 1659 snprintf(i_port, USBG_NAMELEN, "%s", page); 1660 1661 ptr = strstr(i_port, "naa."); 1662 if (!ptr) { 1663 pr_err("Missing 'naa.' prefix\n"); 1664 return -EINVAL; 1665 } 1666 1667 if (i_port[strlen(i_port) - 1] == '\n') 1668 i_port[strlen(i_port) - 1] = '\0'; 1669 1670 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1671 if (ret < 0) 1672 return ret; 1673 return count; 1674 } 1675 1676 CONFIGFS_ATTR(tcm_usbg_tpg_, enable); 1677 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1678 1679 static struct configfs_attribute *usbg_base_attrs[] = { 1680 &tcm_usbg_tpg_attr_enable, 1681 &tcm_usbg_tpg_attr_nexus, 1682 NULL, 1683 }; 1684 1685 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1686 { 1687 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1688 1689 atomic_inc(&tpg->tpg_port_count); 1690 smp_mb__after_atomic(); 1691 return 0; 1692 } 1693 1694 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1695 struct se_lun *se_lun) 1696 { 1697 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1698 1699 atomic_dec(&tpg->tpg_port_count); 1700 smp_mb__after_atomic(); 1701 } 1702 1703 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1704 { 1705 return target_put_sess_cmd(se_cmd); 1706 } 1707 1708 static const struct target_core_fabric_ops usbg_ops = { 1709 .module = THIS_MODULE, 1710 .fabric_name = "usb_gadget", 1711 .tpg_get_wwn = usbg_get_fabric_wwn, 1712 .tpg_get_tag = usbg_get_tag, 1713 .tpg_check_demo_mode = usbg_check_true, 1714 .tpg_check_demo_mode_cache = usbg_check_false, 1715 .tpg_check_demo_mode_write_protect = usbg_check_false, 1716 .tpg_check_prod_mode_write_protect = usbg_check_false, 1717 .tpg_get_inst_index = usbg_tpg_get_inst_index, 1718 .release_cmd = usbg_release_cmd, 1719 .sess_get_index = usbg_sess_get_index, 1720 .sess_get_initiator_sid = NULL, 1721 .write_pending = usbg_send_write_request, 1722 .set_default_node_attributes = usbg_set_default_node_attrs, 1723 .get_cmd_state = usbg_get_cmd_state, 1724 .queue_data_in = usbg_send_read_response, 1725 .queue_status = usbg_send_status_response, 1726 .queue_tm_rsp = usbg_queue_tm_rsp, 1727 .aborted_task = usbg_aborted_task, 1728 .check_stop_free = usbg_check_stop_free, 1729 1730 .fabric_make_wwn = usbg_make_tport, 1731 .fabric_drop_wwn = usbg_drop_tport, 1732 .fabric_make_tpg = usbg_make_tpg, 1733 .fabric_drop_tpg = usbg_drop_tpg, 1734 .fabric_post_link = usbg_port_link, 1735 .fabric_pre_unlink = usbg_port_unlink, 1736 .fabric_init_nodeacl = usbg_init_nodeacl, 1737 1738 .tfc_wwn_attrs = usbg_wwn_attrs, 1739 .tfc_tpg_base_attrs = usbg_base_attrs, 1740 }; 1741 1742 /* Start gadget.c code */ 1743 1744 static struct usb_interface_descriptor bot_intf_desc = { 1745 .bLength = sizeof(bot_intf_desc), 1746 .bDescriptorType = USB_DT_INTERFACE, 1747 .bNumEndpoints = 2, 1748 .bAlternateSetting = USB_G_ALT_INT_BBB, 1749 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1750 .bInterfaceSubClass = USB_SC_SCSI, 1751 .bInterfaceProtocol = USB_PR_BULK, 1752 }; 1753 1754 static struct usb_interface_descriptor uasp_intf_desc = { 1755 .bLength = sizeof(uasp_intf_desc), 1756 .bDescriptorType = USB_DT_INTERFACE, 1757 .bNumEndpoints = 4, 1758 .bAlternateSetting = USB_G_ALT_INT_UAS, 1759 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1760 .bInterfaceSubClass = USB_SC_SCSI, 1761 .bInterfaceProtocol = USB_PR_UAS, 1762 }; 1763 1764 static struct usb_endpoint_descriptor uasp_bi_desc = { 1765 .bLength = USB_DT_ENDPOINT_SIZE, 1766 .bDescriptorType = USB_DT_ENDPOINT, 1767 .bEndpointAddress = USB_DIR_IN, 1768 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1769 .wMaxPacketSize = cpu_to_le16(512), 1770 }; 1771 1772 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1773 .bLength = USB_DT_ENDPOINT_SIZE, 1774 .bDescriptorType = USB_DT_ENDPOINT, 1775 .bEndpointAddress = USB_DIR_IN, 1776 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1777 }; 1778 1779 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1780 .bLength = sizeof(uasp_bi_pipe_desc), 1781 .bDescriptorType = USB_DT_PIPE_USAGE, 1782 .bPipeID = DATA_IN_PIPE_ID, 1783 }; 1784 1785 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1786 .bLength = USB_DT_ENDPOINT_SIZE, 1787 .bDescriptorType = USB_DT_ENDPOINT, 1788 .bEndpointAddress = USB_DIR_IN, 1789 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1790 .wMaxPacketSize = cpu_to_le16(1024), 1791 }; 1792 1793 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1794 .bLength = sizeof(uasp_bi_ep_comp_desc), 1795 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1796 .bMaxBurst = 0, 1797 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1798 .wBytesPerInterval = 0, 1799 }; 1800 1801 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1802 .bLength = sizeof(bot_bi_ep_comp_desc), 1803 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1804 .bMaxBurst = 0, 1805 }; 1806 1807 static struct usb_endpoint_descriptor uasp_bo_desc = { 1808 .bLength = USB_DT_ENDPOINT_SIZE, 1809 .bDescriptorType = USB_DT_ENDPOINT, 1810 .bEndpointAddress = USB_DIR_OUT, 1811 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1812 .wMaxPacketSize = cpu_to_le16(512), 1813 }; 1814 1815 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1816 .bLength = USB_DT_ENDPOINT_SIZE, 1817 .bDescriptorType = USB_DT_ENDPOINT, 1818 .bEndpointAddress = USB_DIR_OUT, 1819 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1820 }; 1821 1822 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1823 .bLength = sizeof(uasp_bo_pipe_desc), 1824 .bDescriptorType = USB_DT_PIPE_USAGE, 1825 .bPipeID = DATA_OUT_PIPE_ID, 1826 }; 1827 1828 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1829 .bLength = USB_DT_ENDPOINT_SIZE, 1830 .bDescriptorType = USB_DT_ENDPOINT, 1831 .bEndpointAddress = USB_DIR_OUT, 1832 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1833 .wMaxPacketSize = cpu_to_le16(0x400), 1834 }; 1835 1836 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1837 .bLength = sizeof(uasp_bo_ep_comp_desc), 1838 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1839 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1840 }; 1841 1842 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1843 .bLength = sizeof(bot_bo_ep_comp_desc), 1844 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1845 }; 1846 1847 static struct usb_endpoint_descriptor uasp_status_desc = { 1848 .bLength = USB_DT_ENDPOINT_SIZE, 1849 .bDescriptorType = USB_DT_ENDPOINT, 1850 .bEndpointAddress = USB_DIR_IN, 1851 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1852 .wMaxPacketSize = cpu_to_le16(512), 1853 }; 1854 1855 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1856 .bLength = USB_DT_ENDPOINT_SIZE, 1857 .bDescriptorType = USB_DT_ENDPOINT, 1858 .bEndpointAddress = USB_DIR_IN, 1859 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1860 }; 1861 1862 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1863 .bLength = sizeof(uasp_status_pipe_desc), 1864 .bDescriptorType = USB_DT_PIPE_USAGE, 1865 .bPipeID = STATUS_PIPE_ID, 1866 }; 1867 1868 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1869 .bLength = USB_DT_ENDPOINT_SIZE, 1870 .bDescriptorType = USB_DT_ENDPOINT, 1871 .bEndpointAddress = USB_DIR_IN, 1872 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1873 .wMaxPacketSize = cpu_to_le16(1024), 1874 }; 1875 1876 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1877 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1878 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1879 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1880 }; 1881 1882 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1883 .bLength = USB_DT_ENDPOINT_SIZE, 1884 .bDescriptorType = USB_DT_ENDPOINT, 1885 .bEndpointAddress = USB_DIR_OUT, 1886 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1887 .wMaxPacketSize = cpu_to_le16(512), 1888 }; 1889 1890 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1891 .bLength = USB_DT_ENDPOINT_SIZE, 1892 .bDescriptorType = USB_DT_ENDPOINT, 1893 .bEndpointAddress = USB_DIR_OUT, 1894 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1895 }; 1896 1897 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1898 .bLength = sizeof(uasp_cmd_pipe_desc), 1899 .bDescriptorType = USB_DT_PIPE_USAGE, 1900 .bPipeID = CMD_PIPE_ID, 1901 }; 1902 1903 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1904 .bLength = USB_DT_ENDPOINT_SIZE, 1905 .bDescriptorType = USB_DT_ENDPOINT, 1906 .bEndpointAddress = USB_DIR_OUT, 1907 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1908 .wMaxPacketSize = cpu_to_le16(1024), 1909 }; 1910 1911 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1912 .bLength = sizeof(uasp_cmd_comp_desc), 1913 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1914 }; 1915 1916 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1917 (struct usb_descriptor_header *) &bot_intf_desc, 1918 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1919 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1920 1921 (struct usb_descriptor_header *) &uasp_intf_desc, 1922 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1923 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1924 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1925 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1926 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1927 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1928 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1929 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1930 NULL, 1931 }; 1932 1933 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1934 (struct usb_descriptor_header *) &bot_intf_desc, 1935 (struct usb_descriptor_header *) &uasp_bi_desc, 1936 (struct usb_descriptor_header *) &uasp_bo_desc, 1937 1938 (struct usb_descriptor_header *) &uasp_intf_desc, 1939 (struct usb_descriptor_header *) &uasp_bi_desc, 1940 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1941 (struct usb_descriptor_header *) &uasp_bo_desc, 1942 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1943 (struct usb_descriptor_header *) &uasp_status_desc, 1944 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1945 (struct usb_descriptor_header *) &uasp_cmd_desc, 1946 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1947 NULL, 1948 }; 1949 1950 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1951 (struct usb_descriptor_header *) &bot_intf_desc, 1952 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1953 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1954 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1955 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1956 1957 (struct usb_descriptor_header *) &uasp_intf_desc, 1958 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1959 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1960 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1961 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1962 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1963 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1964 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1965 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1966 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1967 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1968 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1969 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1970 NULL, 1971 }; 1972 1973 static struct usb_string tcm_us_strings[] = { 1974 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1975 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1976 { }, 1977 }; 1978 1979 static struct usb_gadget_strings tcm_stringtab = { 1980 .language = 0x0409, 1981 .strings = tcm_us_strings, 1982 }; 1983 1984 static struct usb_gadget_strings *tcm_strings[] = { 1985 &tcm_stringtab, 1986 NULL, 1987 }; 1988 1989 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1990 { 1991 struct f_uas *fu = to_f_uas(f); 1992 struct usb_string *us; 1993 struct usb_gadget *gadget = c->cdev->gadget; 1994 struct usb_ep *ep; 1995 struct f_tcm_opts *opts; 1996 int iface; 1997 int ret; 1998 1999 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 2000 2001 mutex_lock(&opts->dep_lock); 2002 if (!opts->can_attach) { 2003 mutex_unlock(&opts->dep_lock); 2004 return -ENODEV; 2005 } 2006 mutex_unlock(&opts->dep_lock); 2007 us = usb_gstrings_attach(c->cdev, tcm_strings, 2008 ARRAY_SIZE(tcm_us_strings)); 2009 if (IS_ERR(us)) 2010 return PTR_ERR(us); 2011 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 2012 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 2013 2014 iface = usb_interface_id(c, f); 2015 if (iface < 0) 2016 return iface; 2017 2018 bot_intf_desc.bInterfaceNumber = iface; 2019 uasp_intf_desc.bInterfaceNumber = iface; 2020 fu->iface = iface; 2021 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 2022 &uasp_bi_ep_comp_desc); 2023 if (!ep) 2024 goto ep_fail; 2025 2026 fu->ep_in = ep; 2027 2028 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 2029 &uasp_bo_ep_comp_desc); 2030 if (!ep) 2031 goto ep_fail; 2032 fu->ep_out = ep; 2033 2034 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 2035 &uasp_status_in_ep_comp_desc); 2036 if (!ep) 2037 goto ep_fail; 2038 fu->ep_status = ep; 2039 2040 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 2041 &uasp_cmd_comp_desc); 2042 if (!ep) 2043 goto ep_fail; 2044 fu->ep_cmd = ep; 2045 2046 /* Assume endpoint addresses are the same for both speeds */ 2047 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2048 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2049 uasp_status_desc.bEndpointAddress = 2050 uasp_ss_status_desc.bEndpointAddress; 2051 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2052 2053 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2054 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2055 uasp_fs_status_desc.bEndpointAddress = 2056 uasp_ss_status_desc.bEndpointAddress; 2057 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2058 2059 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2060 uasp_hs_function_desc, uasp_ss_function_desc, 2061 uasp_ss_function_desc); 2062 if (ret) 2063 goto ep_fail; 2064 2065 return 0; 2066 ep_fail: 2067 pr_err("Can't claim all required eps\n"); 2068 2069 return -ENOTSUPP; 2070 } 2071 2072 struct guas_setup_wq { 2073 struct work_struct work; 2074 struct f_uas *fu; 2075 unsigned int alt; 2076 }; 2077 2078 static void tcm_delayed_set_alt(struct work_struct *wq) 2079 { 2080 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2081 work); 2082 struct f_uas *fu = work->fu; 2083 int alt = work->alt; 2084 2085 kfree(work); 2086 2087 if (fu->flags & USBG_IS_BOT) 2088 bot_cleanup_old_alt(fu); 2089 if (fu->flags & USBG_IS_UAS) 2090 uasp_cleanup_old_alt(fu); 2091 2092 if (alt == USB_G_ALT_INT_BBB) 2093 bot_set_alt(fu); 2094 else if (alt == USB_G_ALT_INT_UAS) 2095 uasp_set_alt(fu); 2096 usb_composite_setup_continue(fu->function.config->cdev); 2097 } 2098 2099 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2100 { 2101 if (intf == bot_intf_desc.bInterfaceNumber) 2102 return USB_G_ALT_INT_BBB; 2103 if (intf == uasp_intf_desc.bInterfaceNumber) 2104 return USB_G_ALT_INT_UAS; 2105 2106 return -EOPNOTSUPP; 2107 } 2108 2109 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2110 { 2111 struct f_uas *fu = to_f_uas(f); 2112 2113 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2114 struct guas_setup_wq *work; 2115 2116 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2117 if (!work) 2118 return -ENOMEM; 2119 INIT_WORK(&work->work, tcm_delayed_set_alt); 2120 work->fu = fu; 2121 work->alt = alt; 2122 schedule_work(&work->work); 2123 return USB_GADGET_DELAYED_STATUS; 2124 } 2125 return -EOPNOTSUPP; 2126 } 2127 2128 static void tcm_disable(struct usb_function *f) 2129 { 2130 struct f_uas *fu = to_f_uas(f); 2131 2132 if (fu->flags & USBG_IS_UAS) 2133 uasp_cleanup_old_alt(fu); 2134 else if (fu->flags & USBG_IS_BOT) 2135 bot_cleanup_old_alt(fu); 2136 fu->flags = 0; 2137 } 2138 2139 static int tcm_setup(struct usb_function *f, 2140 const struct usb_ctrlrequest *ctrl) 2141 { 2142 struct f_uas *fu = to_f_uas(f); 2143 2144 if (!(fu->flags & USBG_IS_BOT)) 2145 return -EOPNOTSUPP; 2146 2147 return usbg_bot_setup(f, ctrl); 2148 } 2149 2150 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2151 { 2152 return container_of(to_config_group(item), struct f_tcm_opts, 2153 func_inst.group); 2154 } 2155 2156 static void tcm_attr_release(struct config_item *item) 2157 { 2158 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2159 2160 usb_put_function_instance(&opts->func_inst); 2161 } 2162 2163 static struct configfs_item_operations tcm_item_ops = { 2164 .release = tcm_attr_release, 2165 }; 2166 2167 static const struct config_item_type tcm_func_type = { 2168 .ct_item_ops = &tcm_item_ops, 2169 .ct_owner = THIS_MODULE, 2170 }; 2171 2172 static void tcm_free_inst(struct usb_function_instance *f) 2173 { 2174 struct f_tcm_opts *opts; 2175 unsigned i; 2176 2177 opts = container_of(f, struct f_tcm_opts, func_inst); 2178 2179 mutex_lock(&tpg_instances_lock); 2180 for (i = 0; i < TPG_INSTANCES; ++i) 2181 if (tpg_instances[i].func_inst == f) 2182 break; 2183 if (i < TPG_INSTANCES) 2184 tpg_instances[i].func_inst = NULL; 2185 mutex_unlock(&tpg_instances_lock); 2186 2187 kfree(opts); 2188 } 2189 2190 static int tcm_register_callback(struct usb_function_instance *f) 2191 { 2192 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2193 2194 mutex_lock(&opts->dep_lock); 2195 opts->can_attach = true; 2196 mutex_unlock(&opts->dep_lock); 2197 2198 return 0; 2199 } 2200 2201 static void tcm_unregister_callback(struct usb_function_instance *f) 2202 { 2203 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2204 2205 mutex_lock(&opts->dep_lock); 2206 unregister_gadget_item(opts-> 2207 func_inst.group.cg_item.ci_parent->ci_parent); 2208 opts->can_attach = false; 2209 mutex_unlock(&opts->dep_lock); 2210 } 2211 2212 static int usbg_attach(struct usbg_tpg *tpg) 2213 { 2214 struct usb_function_instance *f = tpg->fi; 2215 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2216 2217 if (opts->tcm_register_callback) 2218 return opts->tcm_register_callback(f); 2219 2220 return 0; 2221 } 2222 2223 static void usbg_detach(struct usbg_tpg *tpg) 2224 { 2225 struct usb_function_instance *f = tpg->fi; 2226 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2227 2228 if (opts->tcm_unregister_callback) 2229 opts->tcm_unregister_callback(f); 2230 } 2231 2232 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2233 { 2234 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2235 2236 pr_debug("tcm: Activating %s\n", name); 2237 2238 mutex_lock(&opts->dep_lock); 2239 opts->ready = true; 2240 mutex_unlock(&opts->dep_lock); 2241 2242 return 0; 2243 } 2244 2245 static struct usb_function_instance *tcm_alloc_inst(void) 2246 { 2247 struct f_tcm_opts *opts; 2248 int i; 2249 2250 2251 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2252 if (!opts) 2253 return ERR_PTR(-ENOMEM); 2254 2255 mutex_lock(&tpg_instances_lock); 2256 for (i = 0; i < TPG_INSTANCES; ++i) 2257 if (!tpg_instances[i].func_inst) 2258 break; 2259 2260 if (i == TPG_INSTANCES) { 2261 mutex_unlock(&tpg_instances_lock); 2262 kfree(opts); 2263 return ERR_PTR(-EBUSY); 2264 } 2265 tpg_instances[i].func_inst = &opts->func_inst; 2266 mutex_unlock(&tpg_instances_lock); 2267 2268 mutex_init(&opts->dep_lock); 2269 opts->func_inst.set_inst_name = tcm_set_name; 2270 opts->func_inst.free_func_inst = tcm_free_inst; 2271 opts->tcm_register_callback = tcm_register_callback; 2272 opts->tcm_unregister_callback = tcm_unregister_callback; 2273 2274 config_group_init_type_name(&opts->func_inst.group, "", 2275 &tcm_func_type); 2276 2277 return &opts->func_inst; 2278 } 2279 2280 static void tcm_free(struct usb_function *f) 2281 { 2282 struct f_uas *tcm = to_f_uas(f); 2283 2284 kfree(tcm); 2285 } 2286 2287 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2288 { 2289 usb_free_all_descriptors(f); 2290 } 2291 2292 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2293 { 2294 struct f_uas *fu; 2295 unsigned i; 2296 2297 mutex_lock(&tpg_instances_lock); 2298 for (i = 0; i < TPG_INSTANCES; ++i) 2299 if (tpg_instances[i].func_inst == fi) 2300 break; 2301 if (i == TPG_INSTANCES) { 2302 mutex_unlock(&tpg_instances_lock); 2303 return ERR_PTR(-ENODEV); 2304 } 2305 2306 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2307 if (!fu) { 2308 mutex_unlock(&tpg_instances_lock); 2309 return ERR_PTR(-ENOMEM); 2310 } 2311 2312 fu->function.name = "Target Function"; 2313 fu->function.bind = tcm_bind; 2314 fu->function.unbind = tcm_unbind; 2315 fu->function.set_alt = tcm_set_alt; 2316 fu->function.get_alt = tcm_get_alt; 2317 fu->function.setup = tcm_setup; 2318 fu->function.disable = tcm_disable; 2319 fu->function.free_func = tcm_free; 2320 fu->tpg = tpg_instances[i].tpg; 2321 mutex_unlock(&tpg_instances_lock); 2322 2323 return &fu->function; 2324 } 2325 2326 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2327 2328 static int tcm_init(void) 2329 { 2330 int ret; 2331 2332 ret = usb_function_register(&tcmusb_func); 2333 if (ret) 2334 return ret; 2335 2336 ret = target_register_template(&usbg_ops); 2337 if (ret) 2338 usb_function_unregister(&tcmusb_func); 2339 2340 return ret; 2341 } 2342 module_init(tcm_init); 2343 2344 static void tcm_exit(void) 2345 { 2346 target_unregister_template(&usbg_ops); 2347 usb_function_unregister(&tcmusb_func); 2348 } 2349 module_exit(tcm_exit); 2350 2351 MODULE_LICENSE("GPL"); 2352 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2353