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 30struct tpg_instance { 31 struct usb_function_instance *func_inst; 32 struct usbg_tpg *tpg; 33}; 34 35static struct tpg_instance tpg_instances[TPG_INSTANCES]; 36 37static DEFINE_MUTEX(tpg_instances_lock); 38 39static 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 46static 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 59static 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 74static 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 89static 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 112static 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 146static 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 */ 182static 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 */ 192static 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 202static 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 241static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); 242static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); 243 244static 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); 284cleanup: 285 return ret; 286} 287 288static int bot_submit_command(struct f_uas *, void *, unsigned int); 289 290static 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 305static 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; 343err_queue: 344 kfree(fu->cmd.buf); 345 fu->cmd.buf = NULL; 346err_buf: 347 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 348err_sts: 349 usb_ep_free_request(fu->ep_out, fu->cmd.req); 350 fu->cmd.req = NULL; 351err_cmd: 352 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 353 fu->bot_req_out = NULL; 354err_out: 355 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 356 fu->bot_req_in = NULL; 357err: 358 pr_err("BOT: endpoint setup failed\n"); 359 return -ENOMEM; 360} 361 362static 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 387static 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; 411err_wq: 412 usb_ep_disable(fu->ep_out); 413err_b_out: 414 usb_ep_disable(fu->ep_in); 415err_b_in: 416 fu->flags = USBG_IS_BOT; 417} 418 419static 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 468static 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 483static 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 491static 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 508static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 509 510static 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 543static 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 565static 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 612cleanup: 613 transport_generic_free_cmd(&cmd->se_cmd, 0); 614} 615 616static 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 630static 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 } 669out: 670 return ret; 671} 672 673static 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); 715cleanup: 716 return ret; 717} 718 719static int usbg_submit_command(struct f_uas *, void *, unsigned int); 720 721static 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 741static 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 757err_sts: 758 usb_ep_free_request(fu->ep_out, stream->req_out); 759 stream->req_out = NULL; 760err_out: 761 usb_ep_free_request(fu->ep_in, stream->req_in); 762 stream->req_in = NULL; 763out: 764 return -ENOMEM; 765} 766 767static 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 783err_buf: 784 usb_ep_free_request(fu->ep_cmd, fu->cmd.req); 785err: 786 return -ENOMEM; 787} 788 789static 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 802static 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 830err_free_stream: 831 uasp_free_cmdreq(fu); 832 833err_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 844static 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; 881err_wq: 882 usb_ep_disable(fu->ep_status); 883err_status: 884 usb_ep_disable(fu->ep_cmd); 885err_cmd: 886 usb_ep_disable(fu->ep_out); 887err_b_out: 888 usb_ep_disable(fu->ep_in); 889err_b_in: 890 fu->flags = 0; 891} 892 893static 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 955static 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 975cleanup: 976 transport_generic_free_cmd(&cmd->se_cmd, 0); 977} 978 979static 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 1004static 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 1016static 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 1028static 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 1040static 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, NULL); 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 1066out: 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 1072static 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 1093static void usbg_release_cmd(struct se_cmd *); 1094 1095static 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; 1164err: 1165 usbg_release_cmd(&cmd->se_cmd); 1166 return -EINVAL; 1167} 1168 1169static 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, NULL); 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 1195out: 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 1201static 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 1251static int usbg_check_true(struct se_portal_group *se_tpg) 1252{ 1253 return 1; 1254} 1255 1256static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1257{ 1258 struct usbg_tpg *tpg = container_of(se_tpg, 1259 struct usbg_tpg, se_tpg); 1260 struct usbg_tport *tport = tpg->tport; 1261 1262 return &tport->tport_name[0]; 1263} 1264 1265static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1266{ 1267 struct usbg_tpg *tpg = container_of(se_tpg, 1268 struct usbg_tpg, se_tpg); 1269 return tpg->tport_tpgt; 1270} 1271 1272static void usbg_release_cmd(struct se_cmd *se_cmd) 1273{ 1274 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1275 se_cmd); 1276 struct se_session *se_sess = se_cmd->se_sess; 1277 1278 kfree(cmd->data_buf); 1279 target_free_tag(se_sess, se_cmd); 1280} 1281 1282static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1283{ 1284} 1285 1286static void usbg_aborted_task(struct se_cmd *se_cmd) 1287{ 1288} 1289 1290static const char *usbg_check_wwn(const char *name) 1291{ 1292 const char *n; 1293 unsigned int len; 1294 1295 n = strstr(name, "naa."); 1296 if (!n) 1297 return NULL; 1298 n += 4; 1299 len = strlen(n); 1300 if (len == 0 || len > USBG_NAMELEN - 1) 1301 return NULL; 1302 return n; 1303} 1304 1305static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1306{ 1307 if (!usbg_check_wwn(name)) 1308 return -EINVAL; 1309 return 0; 1310} 1311 1312static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1313 const char *name) 1314{ 1315 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1316 tport_wwn); 1317 struct usbg_tpg *tpg; 1318 unsigned long tpgt; 1319 int ret; 1320 struct f_tcm_opts *opts; 1321 unsigned i; 1322 1323 if (strstr(name, "tpgt_") != name) 1324 return ERR_PTR(-EINVAL); 1325 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1326 return ERR_PTR(-EINVAL); 1327 ret = -ENODEV; 1328 mutex_lock(&tpg_instances_lock); 1329 for (i = 0; i < TPG_INSTANCES; ++i) 1330 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1331 break; 1332 if (i == TPG_INSTANCES) 1333 goto unlock_inst; 1334 1335 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1336 func_inst); 1337 mutex_lock(&opts->dep_lock); 1338 if (!opts->ready) 1339 goto unlock_dep; 1340 1341 if (opts->has_dep) { 1342 if (!try_module_get(opts->dependent)) 1343 goto unlock_dep; 1344 } else { 1345 ret = configfs_depend_item_unlocked( 1346 wwn->wwn_group.cg_subsys, 1347 &opts->func_inst.group.cg_item); 1348 if (ret) 1349 goto unlock_dep; 1350 } 1351 1352 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1353 ret = -ENOMEM; 1354 if (!tpg) 1355 goto unref_dep; 1356 mutex_init(&tpg->tpg_mutex); 1357 atomic_set(&tpg->tpg_port_count, 0); 1358 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); 1359 if (!tpg->workqueue) 1360 goto free_tpg; 1361 1362 tpg->tport = tport; 1363 tpg->tport_tpgt = tpgt; 1364 1365 /* 1366 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1367 * pretend to be SAS.. 1368 */ 1369 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1370 if (ret < 0) 1371 goto free_workqueue; 1372 1373 tpg_instances[i].tpg = tpg; 1374 tpg->fi = tpg_instances[i].func_inst; 1375 mutex_unlock(&opts->dep_lock); 1376 mutex_unlock(&tpg_instances_lock); 1377 return &tpg->se_tpg; 1378 1379free_workqueue: 1380 destroy_workqueue(tpg->workqueue); 1381free_tpg: 1382 kfree(tpg); 1383unref_dep: 1384 if (opts->has_dep) 1385 module_put(opts->dependent); 1386 else 1387 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1388unlock_dep: 1389 mutex_unlock(&opts->dep_lock); 1390unlock_inst: 1391 mutex_unlock(&tpg_instances_lock); 1392 1393 return ERR_PTR(ret); 1394} 1395 1396static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1397 1398static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1399{ 1400 struct usbg_tpg *tpg = container_of(se_tpg, 1401 struct usbg_tpg, se_tpg); 1402 unsigned i; 1403 struct f_tcm_opts *opts; 1404 1405 tcm_usbg_drop_nexus(tpg); 1406 core_tpg_deregister(se_tpg); 1407 destroy_workqueue(tpg->workqueue); 1408 1409 mutex_lock(&tpg_instances_lock); 1410 for (i = 0; i < TPG_INSTANCES; ++i) 1411 if (tpg_instances[i].tpg == tpg) 1412 break; 1413 if (i < TPG_INSTANCES) { 1414 tpg_instances[i].tpg = NULL; 1415 opts = container_of(tpg_instances[i].func_inst, 1416 struct f_tcm_opts, func_inst); 1417 mutex_lock(&opts->dep_lock); 1418 if (opts->has_dep) 1419 module_put(opts->dependent); 1420 else 1421 configfs_undepend_item_unlocked( 1422 &opts->func_inst.group.cg_item); 1423 mutex_unlock(&opts->dep_lock); 1424 } 1425 mutex_unlock(&tpg_instances_lock); 1426 1427 kfree(tpg); 1428} 1429 1430static struct se_wwn *usbg_make_tport( 1431 struct target_fabric_configfs *tf, 1432 struct config_group *group, 1433 const char *name) 1434{ 1435 struct usbg_tport *tport; 1436 const char *wnn_name; 1437 u64 wwpn = 0; 1438 1439 wnn_name = usbg_check_wwn(name); 1440 if (!wnn_name) 1441 return ERR_PTR(-EINVAL); 1442 1443 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1444 if (!(tport)) 1445 return ERR_PTR(-ENOMEM); 1446 1447 tport->tport_wwpn = wwpn; 1448 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1449 return &tport->tport_wwn; 1450} 1451 1452static void usbg_drop_tport(struct se_wwn *wwn) 1453{ 1454 struct usbg_tport *tport = container_of(wwn, 1455 struct usbg_tport, tport_wwn); 1456 kfree(tport); 1457} 1458 1459/* 1460 * If somebody feels like dropping the version property, go ahead. 1461 */ 1462static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1463{ 1464 return sprintf(page, "usb-gadget fabric module\n"); 1465} 1466 1467CONFIGFS_ATTR_RO(usbg_wwn_, version); 1468 1469static struct configfs_attribute *usbg_wwn_attrs[] = { 1470 &usbg_wwn_attr_version, 1471 NULL, 1472}; 1473 1474static int usbg_attach(struct usbg_tpg *); 1475static void usbg_detach(struct usbg_tpg *); 1476 1477static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable) 1478{ 1479 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1480 int ret = 0; 1481 1482 if (enable) 1483 ret = usbg_attach(tpg); 1484 else 1485 usbg_detach(tpg); 1486 if (ret) 1487 return ret; 1488 1489 tpg->gadget_connect = enable; 1490 1491 return 0; 1492} 1493 1494static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1495{ 1496 struct se_portal_group *se_tpg = to_tpg(item); 1497 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1498 struct tcm_usbg_nexus *tv_nexus; 1499 ssize_t ret; 1500 1501 mutex_lock(&tpg->tpg_mutex); 1502 tv_nexus = tpg->tpg_nexus; 1503 if (!tv_nexus) { 1504 ret = -ENODEV; 1505 goto out; 1506 } 1507 ret = sysfs_emit(page, "%s\n", 1508 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1509out: 1510 mutex_unlock(&tpg->tpg_mutex); 1511 return ret; 1512} 1513 1514static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1515 struct se_session *se_sess, void *p) 1516{ 1517 struct usbg_tpg *tpg = container_of(se_tpg, 1518 struct usbg_tpg, se_tpg); 1519 1520 tpg->tpg_nexus = p; 1521 return 0; 1522} 1523 1524static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1525{ 1526 struct tcm_usbg_nexus *tv_nexus; 1527 int ret = 0; 1528 1529 mutex_lock(&tpg->tpg_mutex); 1530 if (tpg->tpg_nexus) { 1531 ret = -EEXIST; 1532 pr_debug("tpg->tpg_nexus already exists\n"); 1533 goto out_unlock; 1534 } 1535 1536 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1537 if (!tv_nexus) { 1538 ret = -ENOMEM; 1539 goto out_unlock; 1540 } 1541 1542 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1543 USB_G_DEFAULT_SESSION_TAGS, 1544 sizeof(struct usbg_cmd), 1545 TARGET_PROT_NORMAL, name, 1546 tv_nexus, usbg_alloc_sess_cb); 1547 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1548#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1549 pr_debug(MAKE_NEXUS_MSG, name); 1550#undef MAKE_NEXUS_MSG 1551 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1552 kfree(tv_nexus); 1553 } 1554 1555out_unlock: 1556 mutex_unlock(&tpg->tpg_mutex); 1557 return ret; 1558} 1559 1560static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1561{ 1562 struct se_session *se_sess; 1563 struct tcm_usbg_nexus *tv_nexus; 1564 int ret = -ENODEV; 1565 1566 mutex_lock(&tpg->tpg_mutex); 1567 tv_nexus = tpg->tpg_nexus; 1568 if (!tv_nexus) 1569 goto out; 1570 1571 se_sess = tv_nexus->tvn_se_sess; 1572 if (!se_sess) 1573 goto out; 1574 1575 if (atomic_read(&tpg->tpg_port_count)) { 1576 ret = -EPERM; 1577#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1578 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1579#undef MSG 1580 goto out; 1581 } 1582 1583 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1584 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1585 /* 1586 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1587 */ 1588 target_remove_session(se_sess); 1589 tpg->tpg_nexus = NULL; 1590 1591 kfree(tv_nexus); 1592 ret = 0; 1593out: 1594 mutex_unlock(&tpg->tpg_mutex); 1595 return ret; 1596} 1597 1598static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1599 const char *page, size_t count) 1600{ 1601 struct se_portal_group *se_tpg = to_tpg(item); 1602 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1603 unsigned char i_port[USBG_NAMELEN], *ptr; 1604 int ret; 1605 1606 if (!strncmp(page, "NULL", 4)) { 1607 ret = tcm_usbg_drop_nexus(tpg); 1608 return (!ret) ? count : ret; 1609 } 1610 if (strlen(page) >= USBG_NAMELEN) { 1611 1612#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1613 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1614#undef NEXUS_STORE_MSG 1615 return -EINVAL; 1616 } 1617 snprintf(i_port, USBG_NAMELEN, "%s", page); 1618 1619 ptr = strstr(i_port, "naa."); 1620 if (!ptr) { 1621 pr_err("Missing 'naa.' prefix\n"); 1622 return -EINVAL; 1623 } 1624 1625 if (i_port[strlen(i_port) - 1] == '\n') 1626 i_port[strlen(i_port) - 1] = '\0'; 1627 1628 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1629 if (ret < 0) 1630 return ret; 1631 return count; 1632} 1633 1634CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1635 1636static struct configfs_attribute *usbg_base_attrs[] = { 1637 &tcm_usbg_tpg_attr_nexus, 1638 NULL, 1639}; 1640 1641static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1642{ 1643 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1644 1645 atomic_inc(&tpg->tpg_port_count); 1646 smp_mb__after_atomic(); 1647 return 0; 1648} 1649 1650static void usbg_port_unlink(struct se_portal_group *se_tpg, 1651 struct se_lun *se_lun) 1652{ 1653 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1654 1655 atomic_dec(&tpg->tpg_port_count); 1656 smp_mb__after_atomic(); 1657} 1658 1659static int usbg_check_stop_free(struct se_cmd *se_cmd) 1660{ 1661 return target_put_sess_cmd(se_cmd); 1662} 1663 1664static const struct target_core_fabric_ops usbg_ops = { 1665 .module = THIS_MODULE, 1666 .fabric_name = "usb_gadget", 1667 .tpg_get_wwn = usbg_get_fabric_wwn, 1668 .tpg_get_tag = usbg_get_tag, 1669 .tpg_check_demo_mode = usbg_check_true, 1670 .release_cmd = usbg_release_cmd, 1671 .sess_get_initiator_sid = NULL, 1672 .write_pending = usbg_send_write_request, 1673 .queue_data_in = usbg_send_read_response, 1674 .queue_status = usbg_send_status_response, 1675 .queue_tm_rsp = usbg_queue_tm_rsp, 1676 .aborted_task = usbg_aborted_task, 1677 .check_stop_free = usbg_check_stop_free, 1678 1679 .fabric_make_wwn = usbg_make_tport, 1680 .fabric_drop_wwn = usbg_drop_tport, 1681 .fabric_make_tpg = usbg_make_tpg, 1682 .fabric_enable_tpg = usbg_enable_tpg, 1683 .fabric_drop_tpg = usbg_drop_tpg, 1684 .fabric_post_link = usbg_port_link, 1685 .fabric_pre_unlink = usbg_port_unlink, 1686 .fabric_init_nodeacl = usbg_init_nodeacl, 1687 1688 .tfc_wwn_attrs = usbg_wwn_attrs, 1689 .tfc_tpg_base_attrs = usbg_base_attrs, 1690 1691 .default_submit_type = TARGET_DIRECT_SUBMIT, 1692 .direct_submit_supp = 1, 1693}; 1694 1695/* Start gadget.c code */ 1696 1697static struct usb_interface_descriptor bot_intf_desc = { 1698 .bLength = sizeof(bot_intf_desc), 1699 .bDescriptorType = USB_DT_INTERFACE, 1700 .bNumEndpoints = 2, 1701 .bAlternateSetting = USB_G_ALT_INT_BBB, 1702 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1703 .bInterfaceSubClass = USB_SC_SCSI, 1704 .bInterfaceProtocol = USB_PR_BULK, 1705}; 1706 1707static struct usb_interface_descriptor uasp_intf_desc = { 1708 .bLength = sizeof(uasp_intf_desc), 1709 .bDescriptorType = USB_DT_INTERFACE, 1710 .bNumEndpoints = 4, 1711 .bAlternateSetting = USB_G_ALT_INT_UAS, 1712 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1713 .bInterfaceSubClass = USB_SC_SCSI, 1714 .bInterfaceProtocol = USB_PR_UAS, 1715}; 1716 1717static struct usb_endpoint_descriptor uasp_bi_desc = { 1718 .bLength = USB_DT_ENDPOINT_SIZE, 1719 .bDescriptorType = USB_DT_ENDPOINT, 1720 .bEndpointAddress = USB_DIR_IN, 1721 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1722 .wMaxPacketSize = cpu_to_le16(512), 1723}; 1724 1725static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1726 .bLength = USB_DT_ENDPOINT_SIZE, 1727 .bDescriptorType = USB_DT_ENDPOINT, 1728 .bEndpointAddress = USB_DIR_IN, 1729 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1730}; 1731 1732static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1733 .bLength = sizeof(uasp_bi_pipe_desc), 1734 .bDescriptorType = USB_DT_PIPE_USAGE, 1735 .bPipeID = DATA_IN_PIPE_ID, 1736}; 1737 1738static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1739 .bLength = USB_DT_ENDPOINT_SIZE, 1740 .bDescriptorType = USB_DT_ENDPOINT, 1741 .bEndpointAddress = USB_DIR_IN, 1742 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1743 .wMaxPacketSize = cpu_to_le16(1024), 1744}; 1745 1746static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1747 .bLength = sizeof(uasp_bi_ep_comp_desc), 1748 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1749 .bMaxBurst = 0, 1750 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1751 .wBytesPerInterval = 0, 1752}; 1753 1754static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1755 .bLength = sizeof(bot_bi_ep_comp_desc), 1756 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1757 .bMaxBurst = 0, 1758}; 1759 1760static struct usb_endpoint_descriptor uasp_bo_desc = { 1761 .bLength = USB_DT_ENDPOINT_SIZE, 1762 .bDescriptorType = USB_DT_ENDPOINT, 1763 .bEndpointAddress = USB_DIR_OUT, 1764 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1765 .wMaxPacketSize = cpu_to_le16(512), 1766}; 1767 1768static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1769 .bLength = USB_DT_ENDPOINT_SIZE, 1770 .bDescriptorType = USB_DT_ENDPOINT, 1771 .bEndpointAddress = USB_DIR_OUT, 1772 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1773}; 1774 1775static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1776 .bLength = sizeof(uasp_bo_pipe_desc), 1777 .bDescriptorType = USB_DT_PIPE_USAGE, 1778 .bPipeID = DATA_OUT_PIPE_ID, 1779}; 1780 1781static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1782 .bLength = USB_DT_ENDPOINT_SIZE, 1783 .bDescriptorType = USB_DT_ENDPOINT, 1784 .bEndpointAddress = USB_DIR_OUT, 1785 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1786 .wMaxPacketSize = cpu_to_le16(0x400), 1787}; 1788 1789static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1790 .bLength = sizeof(uasp_bo_ep_comp_desc), 1791 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1792 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1793}; 1794 1795static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1796 .bLength = sizeof(bot_bo_ep_comp_desc), 1797 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1798}; 1799 1800static struct usb_endpoint_descriptor uasp_status_desc = { 1801 .bLength = USB_DT_ENDPOINT_SIZE, 1802 .bDescriptorType = USB_DT_ENDPOINT, 1803 .bEndpointAddress = USB_DIR_IN, 1804 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1805 .wMaxPacketSize = cpu_to_le16(512), 1806}; 1807 1808static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1809 .bLength = USB_DT_ENDPOINT_SIZE, 1810 .bDescriptorType = USB_DT_ENDPOINT, 1811 .bEndpointAddress = USB_DIR_IN, 1812 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1813}; 1814 1815static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1816 .bLength = sizeof(uasp_status_pipe_desc), 1817 .bDescriptorType = USB_DT_PIPE_USAGE, 1818 .bPipeID = STATUS_PIPE_ID, 1819}; 1820 1821static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1822 .bLength = USB_DT_ENDPOINT_SIZE, 1823 .bDescriptorType = USB_DT_ENDPOINT, 1824 .bEndpointAddress = USB_DIR_IN, 1825 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1826 .wMaxPacketSize = cpu_to_le16(1024), 1827}; 1828 1829static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1830 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1831 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1832 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1833}; 1834 1835static struct usb_endpoint_descriptor uasp_cmd_desc = { 1836 .bLength = USB_DT_ENDPOINT_SIZE, 1837 .bDescriptorType = USB_DT_ENDPOINT, 1838 .bEndpointAddress = USB_DIR_OUT, 1839 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1840 .wMaxPacketSize = cpu_to_le16(512), 1841}; 1842 1843static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1844 .bLength = USB_DT_ENDPOINT_SIZE, 1845 .bDescriptorType = USB_DT_ENDPOINT, 1846 .bEndpointAddress = USB_DIR_OUT, 1847 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1848}; 1849 1850static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1851 .bLength = sizeof(uasp_cmd_pipe_desc), 1852 .bDescriptorType = USB_DT_PIPE_USAGE, 1853 .bPipeID = CMD_PIPE_ID, 1854}; 1855 1856static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1857 .bLength = USB_DT_ENDPOINT_SIZE, 1858 .bDescriptorType = USB_DT_ENDPOINT, 1859 .bEndpointAddress = USB_DIR_OUT, 1860 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1861 .wMaxPacketSize = cpu_to_le16(1024), 1862}; 1863 1864static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1865 .bLength = sizeof(uasp_cmd_comp_desc), 1866 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1867}; 1868 1869static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1870 (struct usb_descriptor_header *) &bot_intf_desc, 1871 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1872 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1873 1874 (struct usb_descriptor_header *) &uasp_intf_desc, 1875 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1876 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1877 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1878 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1879 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1880 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1881 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1882 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1883 NULL, 1884}; 1885 1886static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1887 (struct usb_descriptor_header *) &bot_intf_desc, 1888 (struct usb_descriptor_header *) &uasp_bi_desc, 1889 (struct usb_descriptor_header *) &uasp_bo_desc, 1890 1891 (struct usb_descriptor_header *) &uasp_intf_desc, 1892 (struct usb_descriptor_header *) &uasp_bi_desc, 1893 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1894 (struct usb_descriptor_header *) &uasp_bo_desc, 1895 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1896 (struct usb_descriptor_header *) &uasp_status_desc, 1897 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1898 (struct usb_descriptor_header *) &uasp_cmd_desc, 1899 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1900 NULL, 1901}; 1902 1903static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1904 (struct usb_descriptor_header *) &bot_intf_desc, 1905 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1906 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1907 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1908 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1909 1910 (struct usb_descriptor_header *) &uasp_intf_desc, 1911 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1912 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1913 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1914 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1915 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1916 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1917 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1918 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1919 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1920 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1921 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1922 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1923 NULL, 1924}; 1925 1926static struct usb_string tcm_us_strings[] = { 1927 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1928 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1929 { }, 1930}; 1931 1932static struct usb_gadget_strings tcm_stringtab = { 1933 .language = 0x0409, 1934 .strings = tcm_us_strings, 1935}; 1936 1937static struct usb_gadget_strings *tcm_strings[] = { 1938 &tcm_stringtab, 1939 NULL, 1940}; 1941 1942static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1943{ 1944 struct f_uas *fu = to_f_uas(f); 1945 struct usb_string *us; 1946 struct usb_gadget *gadget = c->cdev->gadget; 1947 struct usb_ep *ep; 1948 struct f_tcm_opts *opts; 1949 int iface; 1950 int ret; 1951 1952 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1953 1954 mutex_lock(&opts->dep_lock); 1955 if (!opts->can_attach) { 1956 mutex_unlock(&opts->dep_lock); 1957 return -ENODEV; 1958 } 1959 mutex_unlock(&opts->dep_lock); 1960 us = usb_gstrings_attach(c->cdev, tcm_strings, 1961 ARRAY_SIZE(tcm_us_strings)); 1962 if (IS_ERR(us)) 1963 return PTR_ERR(us); 1964 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 1965 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 1966 1967 iface = usb_interface_id(c, f); 1968 if (iface < 0) 1969 return iface; 1970 1971 bot_intf_desc.bInterfaceNumber = iface; 1972 uasp_intf_desc.bInterfaceNumber = iface; 1973 fu->iface = iface; 1974 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, 1975 &uasp_bi_ep_comp_desc); 1976 if (!ep) 1977 goto ep_fail; 1978 1979 fu->ep_in = ep; 1980 1981 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, 1982 &uasp_bo_ep_comp_desc); 1983 if (!ep) 1984 goto ep_fail; 1985 fu->ep_out = ep; 1986 1987 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, 1988 &uasp_status_in_ep_comp_desc); 1989 if (!ep) 1990 goto ep_fail; 1991 fu->ep_status = ep; 1992 1993 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, 1994 &uasp_cmd_comp_desc); 1995 if (!ep) 1996 goto ep_fail; 1997 fu->ep_cmd = ep; 1998 1999 /* Assume endpoint addresses are the same for both speeds */ 2000 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2001 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2002 uasp_status_desc.bEndpointAddress = 2003 uasp_ss_status_desc.bEndpointAddress; 2004 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2005 2006 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; 2007 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; 2008 uasp_fs_status_desc.bEndpointAddress = 2009 uasp_ss_status_desc.bEndpointAddress; 2010 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; 2011 2012 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 2013 uasp_hs_function_desc, uasp_ss_function_desc, 2014 uasp_ss_function_desc); 2015 if (ret) 2016 goto ep_fail; 2017 2018 return 0; 2019ep_fail: 2020 pr_err("Can't claim all required eps\n"); 2021 2022 return -ENOTSUPP; 2023} 2024 2025struct guas_setup_wq { 2026 struct work_struct work; 2027 struct f_uas *fu; 2028 unsigned int alt; 2029}; 2030 2031static void tcm_delayed_set_alt(struct work_struct *wq) 2032{ 2033 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 2034 work); 2035 struct f_uas *fu = work->fu; 2036 int alt = work->alt; 2037 2038 kfree(work); 2039 2040 if (fu->flags & USBG_IS_BOT) 2041 bot_cleanup_old_alt(fu); 2042 if (fu->flags & USBG_IS_UAS) 2043 uasp_cleanup_old_alt(fu); 2044 2045 if (alt == USB_G_ALT_INT_BBB) 2046 bot_set_alt(fu); 2047 else if (alt == USB_G_ALT_INT_UAS) 2048 uasp_set_alt(fu); 2049 usb_composite_setup_continue(fu->function.config->cdev); 2050} 2051 2052static int tcm_get_alt(struct usb_function *f, unsigned intf) 2053{ 2054 if (intf == bot_intf_desc.bInterfaceNumber) 2055 return USB_G_ALT_INT_BBB; 2056 if (intf == uasp_intf_desc.bInterfaceNumber) 2057 return USB_G_ALT_INT_UAS; 2058 2059 return -EOPNOTSUPP; 2060} 2061 2062static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2063{ 2064 struct f_uas *fu = to_f_uas(f); 2065 2066 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2067 struct guas_setup_wq *work; 2068 2069 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2070 if (!work) 2071 return -ENOMEM; 2072 INIT_WORK(&work->work, tcm_delayed_set_alt); 2073 work->fu = fu; 2074 work->alt = alt; 2075 schedule_work(&work->work); 2076 return USB_GADGET_DELAYED_STATUS; 2077 } 2078 return -EOPNOTSUPP; 2079} 2080 2081static void tcm_disable(struct usb_function *f) 2082{ 2083 struct f_uas *fu = to_f_uas(f); 2084 2085 if (fu->flags & USBG_IS_UAS) 2086 uasp_cleanup_old_alt(fu); 2087 else if (fu->flags & USBG_IS_BOT) 2088 bot_cleanup_old_alt(fu); 2089 fu->flags = 0; 2090} 2091 2092static int tcm_setup(struct usb_function *f, 2093 const struct usb_ctrlrequest *ctrl) 2094{ 2095 struct f_uas *fu = to_f_uas(f); 2096 2097 if (!(fu->flags & USBG_IS_BOT)) 2098 return -EOPNOTSUPP; 2099 2100 return usbg_bot_setup(f, ctrl); 2101} 2102 2103static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2104{ 2105 return container_of(to_config_group(item), struct f_tcm_opts, 2106 func_inst.group); 2107} 2108 2109static void tcm_attr_release(struct config_item *item) 2110{ 2111 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2112 2113 usb_put_function_instance(&opts->func_inst); 2114} 2115 2116static struct configfs_item_operations tcm_item_ops = { 2117 .release = tcm_attr_release, 2118}; 2119 2120static const struct config_item_type tcm_func_type = { 2121 .ct_item_ops = &tcm_item_ops, 2122 .ct_owner = THIS_MODULE, 2123}; 2124 2125static void tcm_free_inst(struct usb_function_instance *f) 2126{ 2127 struct f_tcm_opts *opts; 2128 unsigned i; 2129 2130 opts = container_of(f, struct f_tcm_opts, func_inst); 2131 2132 mutex_lock(&tpg_instances_lock); 2133 for (i = 0; i < TPG_INSTANCES; ++i) 2134 if (tpg_instances[i].func_inst == f) 2135 break; 2136 if (i < TPG_INSTANCES) 2137 tpg_instances[i].func_inst = NULL; 2138 mutex_unlock(&tpg_instances_lock); 2139 2140 kfree(opts); 2141} 2142 2143static int tcm_register_callback(struct usb_function_instance *f) 2144{ 2145 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2146 2147 mutex_lock(&opts->dep_lock); 2148 opts->can_attach = true; 2149 mutex_unlock(&opts->dep_lock); 2150 2151 return 0; 2152} 2153 2154static void tcm_unregister_callback(struct usb_function_instance *f) 2155{ 2156 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2157 2158 mutex_lock(&opts->dep_lock); 2159 unregister_gadget_item(opts-> 2160 func_inst.group.cg_item.ci_parent->ci_parent); 2161 opts->can_attach = false; 2162 mutex_unlock(&opts->dep_lock); 2163} 2164 2165static int usbg_attach(struct usbg_tpg *tpg) 2166{ 2167 struct usb_function_instance *f = tpg->fi; 2168 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2169 2170 if (opts->tcm_register_callback) 2171 return opts->tcm_register_callback(f); 2172 2173 return 0; 2174} 2175 2176static void usbg_detach(struct usbg_tpg *tpg) 2177{ 2178 struct usb_function_instance *f = tpg->fi; 2179 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2180 2181 if (opts->tcm_unregister_callback) 2182 opts->tcm_unregister_callback(f); 2183} 2184 2185static int tcm_set_name(struct usb_function_instance *f, const char *name) 2186{ 2187 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2188 2189 pr_debug("tcm: Activating %s\n", name); 2190 2191 mutex_lock(&opts->dep_lock); 2192 opts->ready = true; 2193 mutex_unlock(&opts->dep_lock); 2194 2195 return 0; 2196} 2197 2198static struct usb_function_instance *tcm_alloc_inst(void) 2199{ 2200 struct f_tcm_opts *opts; 2201 int i; 2202 2203 2204 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2205 if (!opts) 2206 return ERR_PTR(-ENOMEM); 2207 2208 mutex_lock(&tpg_instances_lock); 2209 for (i = 0; i < TPG_INSTANCES; ++i) 2210 if (!tpg_instances[i].func_inst) 2211 break; 2212 2213 if (i == TPG_INSTANCES) { 2214 mutex_unlock(&tpg_instances_lock); 2215 kfree(opts); 2216 return ERR_PTR(-EBUSY); 2217 } 2218 tpg_instances[i].func_inst = &opts->func_inst; 2219 mutex_unlock(&tpg_instances_lock); 2220 2221 mutex_init(&opts->dep_lock); 2222 opts->func_inst.set_inst_name = tcm_set_name; 2223 opts->func_inst.free_func_inst = tcm_free_inst; 2224 opts->tcm_register_callback = tcm_register_callback; 2225 opts->tcm_unregister_callback = tcm_unregister_callback; 2226 2227 config_group_init_type_name(&opts->func_inst.group, "", 2228 &tcm_func_type); 2229 2230 return &opts->func_inst; 2231} 2232 2233static void tcm_free(struct usb_function *f) 2234{ 2235 struct f_uas *tcm = to_f_uas(f); 2236 2237 kfree(tcm); 2238} 2239 2240static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2241{ 2242 usb_free_all_descriptors(f); 2243} 2244 2245static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2246{ 2247 struct f_uas *fu; 2248 unsigned i; 2249 2250 mutex_lock(&tpg_instances_lock); 2251 for (i = 0; i < TPG_INSTANCES; ++i) 2252 if (tpg_instances[i].func_inst == fi) 2253 break; 2254 if (i == TPG_INSTANCES) { 2255 mutex_unlock(&tpg_instances_lock); 2256 return ERR_PTR(-ENODEV); 2257 } 2258 2259 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2260 if (!fu) { 2261 mutex_unlock(&tpg_instances_lock); 2262 return ERR_PTR(-ENOMEM); 2263 } 2264 2265 fu->function.name = "Target Function"; 2266 fu->function.bind = tcm_bind; 2267 fu->function.unbind = tcm_unbind; 2268 fu->function.set_alt = tcm_set_alt; 2269 fu->function.get_alt = tcm_get_alt; 2270 fu->function.setup = tcm_setup; 2271 fu->function.disable = tcm_disable; 2272 fu->function.free_func = tcm_free; 2273 fu->tpg = tpg_instances[i].tpg; 2274 mutex_unlock(&tpg_instances_lock); 2275 2276 return &fu->function; 2277} 2278 2279DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2280 2281static int __init tcm_init(void) 2282{ 2283 int ret; 2284 2285 ret = usb_function_register(&tcmusb_func); 2286 if (ret) 2287 return ret; 2288 2289 ret = target_register_template(&usbg_ops); 2290 if (ret) 2291 usb_function_unregister(&tcmusb_func); 2292 2293 return ret; 2294} 2295module_init(tcm_init); 2296 2297static void __exit tcm_exit(void) 2298{ 2299 target_unregister_template(&usbg_ops); 2300 usb_function_unregister(&tcmusb_func); 2301} 2302module_exit(tcm_exit); 2303 2304MODULE_LICENSE("GPL"); 2305MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2306