1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Thunderbolt driver - Tunneling support 4 * 5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> 6 * Copyright (C) 2019, Intel Corporation 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/slab.h> 11 #include <linux/list.h> 12 13 #include "tunnel.h" 14 #include "tb.h" 15 16 /* PCIe adapters use always HopID of 8 for both directions */ 17 #define TB_PCI_HOPID 8 18 19 #define TB_PCI_PATH_DOWN 0 20 #define TB_PCI_PATH_UP 1 21 22 /* USB3 adapters use always HopID of 8 for both directions */ 23 #define TB_USB3_HOPID 8 24 25 #define TB_USB3_PATH_DOWN 0 26 #define TB_USB3_PATH_UP 1 27 28 /* DP adapters use HopID 8 for AUX and 9 for Video */ 29 #define TB_DP_AUX_TX_HOPID 8 30 #define TB_DP_AUX_RX_HOPID 8 31 #define TB_DP_VIDEO_HOPID 9 32 33 #define TB_DP_VIDEO_PATH_OUT 0 34 #define TB_DP_AUX_PATH_OUT 1 35 #define TB_DP_AUX_PATH_IN 2 36 37 /* Minimum number of credits needed for PCIe path */ 38 #define TB_MIN_PCIE_CREDITS 6U 39 /* 40 * Number of credits we try to allocate for each DMA path if not limited 41 * by the host router baMaxHI. 42 */ 43 #define TB_DMA_CREDITS 14U 44 /* Minimum number of credits for DMA path */ 45 #define TB_MIN_DMA_CREDITS 1U 46 47 static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" }; 48 49 #define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \ 50 do { \ 51 struct tb_tunnel *__tunnel = (tunnel); \ 52 level(__tunnel->tb, "%llx:%x <-> %llx:%x (%s): " fmt, \ 53 tb_route(__tunnel->src_port->sw), \ 54 __tunnel->src_port->port, \ 55 tb_route(__tunnel->dst_port->sw), \ 56 __tunnel->dst_port->port, \ 57 tb_tunnel_names[__tunnel->type], \ 58 ## arg); \ 59 } while (0) 60 61 #define tb_tunnel_WARN(tunnel, fmt, arg...) \ 62 __TB_TUNNEL_PRINT(tb_WARN, tunnel, fmt, ##arg) 63 #define tb_tunnel_warn(tunnel, fmt, arg...) \ 64 __TB_TUNNEL_PRINT(tb_warn, tunnel, fmt, ##arg) 65 #define tb_tunnel_info(tunnel, fmt, arg...) \ 66 __TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg) 67 #define tb_tunnel_dbg(tunnel, fmt, arg...) \ 68 __TB_TUNNEL_PRINT(tb_dbg, tunnel, fmt, ##arg) 69 70 static inline unsigned int tb_usable_credits(const struct tb_port *port) 71 { 72 return port->total_credits - port->ctl_credits; 73 } 74 75 /** 76 * tb_available_credits() - Available credits for PCIe and DMA 77 * @port: Lane adapter to check 78 * @max_dp_streams: If non-%NULL stores maximum number of simultaneous DP 79 * streams possible through this lane adapter 80 */ 81 static unsigned int tb_available_credits(const struct tb_port *port, 82 size_t *max_dp_streams) 83 { 84 const struct tb_switch *sw = port->sw; 85 int credits, usb3, pcie, spare; 86 size_t ndp; 87 88 usb3 = tb_acpi_may_tunnel_usb3() ? sw->max_usb3_credits : 0; 89 pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0; 90 91 if (tb_acpi_is_xdomain_allowed()) { 92 spare = min_not_zero(sw->max_dma_credits, TB_DMA_CREDITS); 93 /* Add some credits for potential second DMA tunnel */ 94 spare += TB_MIN_DMA_CREDITS; 95 } else { 96 spare = 0; 97 } 98 99 credits = tb_usable_credits(port); 100 if (tb_acpi_may_tunnel_dp()) { 101 /* 102 * Maximum number of DP streams possible through the 103 * lane adapter. 104 */ 105 ndp = (credits - (usb3 + pcie + spare)) / 106 (sw->min_dp_aux_credits + sw->min_dp_main_credits); 107 } else { 108 ndp = 0; 109 } 110 credits -= ndp * (sw->min_dp_aux_credits + sw->min_dp_main_credits); 111 credits -= usb3; 112 113 if (max_dp_streams) 114 *max_dp_streams = ndp; 115 116 return credits > 0 ? credits : 0; 117 } 118 119 static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths, 120 enum tb_tunnel_type type) 121 { 122 struct tb_tunnel *tunnel; 123 124 tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL); 125 if (!tunnel) 126 return NULL; 127 128 tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL); 129 if (!tunnel->paths) { 130 tb_tunnel_free(tunnel); 131 return NULL; 132 } 133 134 INIT_LIST_HEAD(&tunnel->list); 135 tunnel->tb = tb; 136 tunnel->npaths = npaths; 137 tunnel->type = type; 138 139 return tunnel; 140 } 141 142 static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate) 143 { 144 int res; 145 146 res = tb_pci_port_enable(tunnel->src_port, activate); 147 if (res) 148 return res; 149 150 if (tb_port_is_pcie_up(tunnel->dst_port)) 151 return tb_pci_port_enable(tunnel->dst_port, activate); 152 153 return 0; 154 } 155 156 static int tb_pci_init_credits(struct tb_path_hop *hop) 157 { 158 struct tb_port *port = hop->in_port; 159 struct tb_switch *sw = port->sw; 160 unsigned int credits; 161 162 if (tb_port_use_credit_allocation(port)) { 163 unsigned int available; 164 165 available = tb_available_credits(port, NULL); 166 credits = min(sw->max_pcie_credits, available); 167 168 if (credits < TB_MIN_PCIE_CREDITS) 169 return -ENOSPC; 170 171 credits = max(TB_MIN_PCIE_CREDITS, credits); 172 } else { 173 if (tb_port_is_null(port)) 174 credits = port->bonded ? 32 : 16; 175 else 176 credits = 7; 177 } 178 179 hop->initial_credits = credits; 180 return 0; 181 } 182 183 static int tb_pci_init_path(struct tb_path *path) 184 { 185 struct tb_path_hop *hop; 186 187 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; 188 path->egress_shared_buffer = TB_PATH_NONE; 189 path->ingress_fc_enable = TB_PATH_ALL; 190 path->ingress_shared_buffer = TB_PATH_NONE; 191 path->priority = 3; 192 path->weight = 1; 193 path->drop_packages = 0; 194 195 tb_path_for_each_hop(path, hop) { 196 int ret; 197 198 ret = tb_pci_init_credits(hop); 199 if (ret) 200 return ret; 201 } 202 203 return 0; 204 } 205 206 /** 207 * tb_tunnel_discover_pci() - Discover existing PCIe tunnels 208 * @tb: Pointer to the domain structure 209 * @down: PCIe downstream adapter 210 * 211 * If @down adapter is active, follows the tunnel to the PCIe upstream 212 * adapter and back. Returns the discovered tunnel or %NULL if there was 213 * no tunnel. 214 */ 215 struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down) 216 { 217 struct tb_tunnel *tunnel; 218 struct tb_path *path; 219 220 if (!tb_pci_port_is_enabled(down)) 221 return NULL; 222 223 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); 224 if (!tunnel) 225 return NULL; 226 227 tunnel->activate = tb_pci_activate; 228 tunnel->src_port = down; 229 230 /* 231 * Discover both paths even if they are not complete. We will 232 * clean them up by calling tb_tunnel_deactivate() below in that 233 * case. 234 */ 235 path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1, 236 &tunnel->dst_port, "PCIe Up"); 237 if (!path) { 238 /* Just disable the downstream port */ 239 tb_pci_port_enable(down, false); 240 goto err_free; 241 } 242 tunnel->paths[TB_PCI_PATH_UP] = path; 243 if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP])) 244 goto err_free; 245 246 path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL, 247 "PCIe Down"); 248 if (!path) 249 goto err_deactivate; 250 tunnel->paths[TB_PCI_PATH_DOWN] = path; 251 if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN])) 252 goto err_deactivate; 253 254 /* Validate that the tunnel is complete */ 255 if (!tb_port_is_pcie_up(tunnel->dst_port)) { 256 tb_port_warn(tunnel->dst_port, 257 "path does not end on a PCIe adapter, cleaning up\n"); 258 goto err_deactivate; 259 } 260 261 if (down != tunnel->src_port) { 262 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); 263 goto err_deactivate; 264 } 265 266 if (!tb_pci_port_is_enabled(tunnel->dst_port)) { 267 tb_tunnel_warn(tunnel, 268 "tunnel is not fully activated, cleaning up\n"); 269 goto err_deactivate; 270 } 271 272 tb_tunnel_dbg(tunnel, "discovered\n"); 273 return tunnel; 274 275 err_deactivate: 276 tb_tunnel_deactivate(tunnel); 277 err_free: 278 tb_tunnel_free(tunnel); 279 280 return NULL; 281 } 282 283 /** 284 * tb_tunnel_alloc_pci() - allocate a pci tunnel 285 * @tb: Pointer to the domain structure 286 * @up: PCIe upstream adapter port 287 * @down: PCIe downstream adapter port 288 * 289 * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and 290 * TB_TYPE_PCIE_DOWN. 291 * 292 * Return: Returns a tb_tunnel on success or NULL on failure. 293 */ 294 struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up, 295 struct tb_port *down) 296 { 297 struct tb_tunnel *tunnel; 298 struct tb_path *path; 299 300 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); 301 if (!tunnel) 302 return NULL; 303 304 tunnel->activate = tb_pci_activate; 305 tunnel->src_port = down; 306 tunnel->dst_port = up; 307 308 path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0, 309 "PCIe Down"); 310 if (!path) 311 goto err_free; 312 tunnel->paths[TB_PCI_PATH_DOWN] = path; 313 if (tb_pci_init_path(path)) 314 goto err_free; 315 316 path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0, 317 "PCIe Up"); 318 if (!path) 319 goto err_free; 320 tunnel->paths[TB_PCI_PATH_UP] = path; 321 if (tb_pci_init_path(path)) 322 goto err_free; 323 324 return tunnel; 325 326 err_free: 327 tb_tunnel_free(tunnel); 328 return NULL; 329 } 330 331 static bool tb_dp_is_usb4(const struct tb_switch *sw) 332 { 333 /* Titan Ridge DP adapters need the same treatment as USB4 */ 334 return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw); 335 } 336 337 static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out) 338 { 339 int timeout = 10; 340 u32 val; 341 int ret; 342 343 /* Both ends need to support this */ 344 if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw)) 345 return 0; 346 347 ret = tb_port_read(out, &val, TB_CFG_PORT, 348 out->cap_adap + DP_STATUS_CTRL, 1); 349 if (ret) 350 return ret; 351 352 val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS; 353 354 ret = tb_port_write(out, &val, TB_CFG_PORT, 355 out->cap_adap + DP_STATUS_CTRL, 1); 356 if (ret) 357 return ret; 358 359 do { 360 ret = tb_port_read(out, &val, TB_CFG_PORT, 361 out->cap_adap + DP_STATUS_CTRL, 1); 362 if (ret) 363 return ret; 364 if (!(val & DP_STATUS_CTRL_CMHS)) 365 return 0; 366 usleep_range(10, 100); 367 } while (timeout--); 368 369 return -ETIMEDOUT; 370 } 371 372 static inline u32 tb_dp_cap_get_rate(u32 val) 373 { 374 u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT; 375 376 switch (rate) { 377 case DP_COMMON_CAP_RATE_RBR: 378 return 1620; 379 case DP_COMMON_CAP_RATE_HBR: 380 return 2700; 381 case DP_COMMON_CAP_RATE_HBR2: 382 return 5400; 383 case DP_COMMON_CAP_RATE_HBR3: 384 return 8100; 385 default: 386 return 0; 387 } 388 } 389 390 static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate) 391 { 392 val &= ~DP_COMMON_CAP_RATE_MASK; 393 switch (rate) { 394 default: 395 WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate); 396 fallthrough; 397 case 1620: 398 val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT; 399 break; 400 case 2700: 401 val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT; 402 break; 403 case 5400: 404 val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT; 405 break; 406 case 8100: 407 val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT; 408 break; 409 } 410 return val; 411 } 412 413 static inline u32 tb_dp_cap_get_lanes(u32 val) 414 { 415 u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT; 416 417 switch (lanes) { 418 case DP_COMMON_CAP_1_LANE: 419 return 1; 420 case DP_COMMON_CAP_2_LANES: 421 return 2; 422 case DP_COMMON_CAP_4_LANES: 423 return 4; 424 default: 425 return 0; 426 } 427 } 428 429 static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes) 430 { 431 val &= ~DP_COMMON_CAP_LANES_MASK; 432 switch (lanes) { 433 default: 434 WARN(1, "invalid number of lanes %u passed, defaulting to 1\n", 435 lanes); 436 fallthrough; 437 case 1: 438 val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT; 439 break; 440 case 2: 441 val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT; 442 break; 443 case 4: 444 val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT; 445 break; 446 } 447 return val; 448 } 449 450 static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes) 451 { 452 /* Tunneling removes the DP 8b/10b encoding */ 453 return rate * lanes * 8 / 10; 454 } 455 456 static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes, 457 u32 out_rate, u32 out_lanes, u32 *new_rate, 458 u32 *new_lanes) 459 { 460 static const u32 dp_bw[][2] = { 461 /* Mb/s, lanes */ 462 { 8100, 4 }, /* 25920 Mb/s */ 463 { 5400, 4 }, /* 17280 Mb/s */ 464 { 8100, 2 }, /* 12960 Mb/s */ 465 { 2700, 4 }, /* 8640 Mb/s */ 466 { 5400, 2 }, /* 8640 Mb/s */ 467 { 8100, 1 }, /* 6480 Mb/s */ 468 { 1620, 4 }, /* 5184 Mb/s */ 469 { 5400, 1 }, /* 4320 Mb/s */ 470 { 2700, 2 }, /* 4320 Mb/s */ 471 { 1620, 2 }, /* 2592 Mb/s */ 472 { 2700, 1 }, /* 2160 Mb/s */ 473 { 1620, 1 }, /* 1296 Mb/s */ 474 }; 475 unsigned int i; 476 477 /* 478 * Find a combination that can fit into max_bw and does not 479 * exceed the maximum rate and lanes supported by the DP OUT and 480 * DP IN adapters. 481 */ 482 for (i = 0; i < ARRAY_SIZE(dp_bw); i++) { 483 if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes) 484 continue; 485 486 if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes) 487 continue; 488 489 if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) { 490 *new_rate = dp_bw[i][0]; 491 *new_lanes = dp_bw[i][1]; 492 return 0; 493 } 494 } 495 496 return -ENOSR; 497 } 498 499 static int tb_dp_xchg_caps(struct tb_tunnel *tunnel) 500 { 501 u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw; 502 struct tb_port *out = tunnel->dst_port; 503 struct tb_port *in = tunnel->src_port; 504 int ret, max_bw; 505 506 /* 507 * Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for 508 * newer generation hardware. 509 */ 510 if (in->sw->generation < 2 || out->sw->generation < 2) 511 return 0; 512 513 /* 514 * Perform connection manager handshake between IN and OUT ports 515 * before capabilities exchange can take place. 516 */ 517 ret = tb_dp_cm_handshake(in, out); 518 if (ret) 519 return ret; 520 521 /* Read both DP_LOCAL_CAP registers */ 522 ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT, 523 in->cap_adap + DP_LOCAL_CAP, 1); 524 if (ret) 525 return ret; 526 527 ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT, 528 out->cap_adap + DP_LOCAL_CAP, 1); 529 if (ret) 530 return ret; 531 532 /* Write IN local caps to OUT remote caps */ 533 ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT, 534 out->cap_adap + DP_REMOTE_CAP, 1); 535 if (ret) 536 return ret; 537 538 in_rate = tb_dp_cap_get_rate(in_dp_cap); 539 in_lanes = tb_dp_cap_get_lanes(in_dp_cap); 540 tb_port_dbg(in, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", 541 in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes)); 542 543 /* 544 * If the tunnel bandwidth is limited (max_bw is set) then see 545 * if we need to reduce bandwidth to fit there. 546 */ 547 out_rate = tb_dp_cap_get_rate(out_dp_cap); 548 out_lanes = tb_dp_cap_get_lanes(out_dp_cap); 549 bw = tb_dp_bandwidth(out_rate, out_lanes); 550 tb_port_dbg(out, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", 551 out_rate, out_lanes, bw); 552 553 if (in->sw->config.depth < out->sw->config.depth) 554 max_bw = tunnel->max_down; 555 else 556 max_bw = tunnel->max_up; 557 558 if (max_bw && bw > max_bw) { 559 u32 new_rate, new_lanes, new_bw; 560 561 ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes, 562 out_rate, out_lanes, &new_rate, 563 &new_lanes); 564 if (ret) { 565 tb_port_info(out, "not enough bandwidth for DP tunnel\n"); 566 return ret; 567 } 568 569 new_bw = tb_dp_bandwidth(new_rate, new_lanes); 570 tb_port_dbg(out, "bandwidth reduced to %u Mb/s x%u = %u Mb/s\n", 571 new_rate, new_lanes, new_bw); 572 573 /* 574 * Set new rate and number of lanes before writing it to 575 * the IN port remote caps. 576 */ 577 out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate); 578 out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes); 579 } 580 581 return tb_port_write(in, &out_dp_cap, TB_CFG_PORT, 582 in->cap_adap + DP_REMOTE_CAP, 1); 583 } 584 585 static int tb_dp_activate(struct tb_tunnel *tunnel, bool active) 586 { 587 int ret; 588 589 if (active) { 590 struct tb_path **paths; 591 int last; 592 593 paths = tunnel->paths; 594 last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1; 595 596 tb_dp_port_set_hops(tunnel->src_port, 597 paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index, 598 paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index, 599 paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index); 600 601 tb_dp_port_set_hops(tunnel->dst_port, 602 paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index, 603 paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index, 604 paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index); 605 } else { 606 tb_dp_port_hpd_clear(tunnel->src_port); 607 tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0); 608 if (tb_port_is_dpout(tunnel->dst_port)) 609 tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0); 610 } 611 612 ret = tb_dp_port_enable(tunnel->src_port, active); 613 if (ret) 614 return ret; 615 616 if (tb_port_is_dpout(tunnel->dst_port)) 617 return tb_dp_port_enable(tunnel->dst_port, active); 618 619 return 0; 620 } 621 622 static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, 623 int *consumed_down) 624 { 625 struct tb_port *in = tunnel->src_port; 626 const struct tb_switch *sw = in->sw; 627 u32 val, rate = 0, lanes = 0; 628 int ret; 629 630 if (tb_dp_is_usb4(sw)) { 631 int timeout = 20; 632 633 /* 634 * Wait for DPRX done. Normally it should be already set 635 * for active tunnel. 636 */ 637 do { 638 ret = tb_port_read(in, &val, TB_CFG_PORT, 639 in->cap_adap + DP_COMMON_CAP, 1); 640 if (ret) 641 return ret; 642 643 if (val & DP_COMMON_CAP_DPRX_DONE) { 644 rate = tb_dp_cap_get_rate(val); 645 lanes = tb_dp_cap_get_lanes(val); 646 break; 647 } 648 msleep(250); 649 } while (timeout--); 650 651 if (!timeout) 652 return -ETIMEDOUT; 653 } else if (sw->generation >= 2) { 654 /* 655 * Read from the copied remote cap so that we take into 656 * account if capabilities were reduced during exchange. 657 */ 658 ret = tb_port_read(in, &val, TB_CFG_PORT, 659 in->cap_adap + DP_REMOTE_CAP, 1); 660 if (ret) 661 return ret; 662 663 rate = tb_dp_cap_get_rate(val); 664 lanes = tb_dp_cap_get_lanes(val); 665 } else { 666 /* No bandwidth management for legacy devices */ 667 *consumed_up = 0; 668 *consumed_down = 0; 669 return 0; 670 } 671 672 if (in->sw->config.depth < tunnel->dst_port->sw->config.depth) { 673 *consumed_up = 0; 674 *consumed_down = tb_dp_bandwidth(rate, lanes); 675 } else { 676 *consumed_up = tb_dp_bandwidth(rate, lanes); 677 *consumed_down = 0; 678 } 679 680 return 0; 681 } 682 683 static void tb_dp_init_aux_credits(struct tb_path_hop *hop) 684 { 685 struct tb_port *port = hop->in_port; 686 struct tb_switch *sw = port->sw; 687 688 if (tb_port_use_credit_allocation(port)) 689 hop->initial_credits = sw->min_dp_aux_credits; 690 else 691 hop->initial_credits = 1; 692 } 693 694 static void tb_dp_init_aux_path(struct tb_path *path) 695 { 696 struct tb_path_hop *hop; 697 698 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; 699 path->egress_shared_buffer = TB_PATH_NONE; 700 path->ingress_fc_enable = TB_PATH_ALL; 701 path->ingress_shared_buffer = TB_PATH_NONE; 702 path->priority = 2; 703 path->weight = 1; 704 705 tb_path_for_each_hop(path, hop) 706 tb_dp_init_aux_credits(hop); 707 } 708 709 static int tb_dp_init_video_credits(struct tb_path_hop *hop) 710 { 711 struct tb_port *port = hop->in_port; 712 struct tb_switch *sw = port->sw; 713 714 if (tb_port_use_credit_allocation(port)) { 715 unsigned int nfc_credits; 716 size_t max_dp_streams; 717 718 tb_available_credits(port, &max_dp_streams); 719 /* 720 * Read the number of currently allocated NFC credits 721 * from the lane adapter. Since we only use them for DP 722 * tunneling we can use that to figure out how many DP 723 * tunnels already go through the lane adapter. 724 */ 725 nfc_credits = port->config.nfc_credits & 726 ADP_CS_4_NFC_BUFFERS_MASK; 727 if (nfc_credits / sw->min_dp_main_credits > max_dp_streams) 728 return -ENOSPC; 729 730 hop->nfc_credits = sw->min_dp_main_credits; 731 } else { 732 hop->nfc_credits = min(port->total_credits - 2, 12U); 733 } 734 735 return 0; 736 } 737 738 static int tb_dp_init_video_path(struct tb_path *path) 739 { 740 struct tb_path_hop *hop; 741 742 path->egress_fc_enable = TB_PATH_NONE; 743 path->egress_shared_buffer = TB_PATH_NONE; 744 path->ingress_fc_enable = TB_PATH_NONE; 745 path->ingress_shared_buffer = TB_PATH_NONE; 746 path->priority = 1; 747 path->weight = 1; 748 749 tb_path_for_each_hop(path, hop) { 750 int ret; 751 752 ret = tb_dp_init_video_credits(hop); 753 if (ret) 754 return ret; 755 } 756 757 return 0; 758 } 759 760 /** 761 * tb_tunnel_discover_dp() - Discover existing Display Port tunnels 762 * @tb: Pointer to the domain structure 763 * @in: DP in adapter 764 * 765 * If @in adapter is active, follows the tunnel to the DP out adapter 766 * and back. Returns the discovered tunnel or %NULL if there was no 767 * tunnel. 768 * 769 * Return: DP tunnel or %NULL if no tunnel found. 770 */ 771 struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in) 772 { 773 struct tb_tunnel *tunnel; 774 struct tb_port *port; 775 struct tb_path *path; 776 777 if (!tb_dp_port_is_enabled(in)) 778 return NULL; 779 780 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); 781 if (!tunnel) 782 return NULL; 783 784 tunnel->init = tb_dp_xchg_caps; 785 tunnel->activate = tb_dp_activate; 786 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; 787 tunnel->src_port = in; 788 789 path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1, 790 &tunnel->dst_port, "Video"); 791 if (!path) { 792 /* Just disable the DP IN port */ 793 tb_dp_port_enable(in, false); 794 goto err_free; 795 } 796 tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path; 797 if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT])) 798 goto err_free; 799 800 path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX"); 801 if (!path) 802 goto err_deactivate; 803 tunnel->paths[TB_DP_AUX_PATH_OUT] = path; 804 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT]); 805 806 path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID, 807 &port, "AUX RX"); 808 if (!path) 809 goto err_deactivate; 810 tunnel->paths[TB_DP_AUX_PATH_IN] = path; 811 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN]); 812 813 /* Validate that the tunnel is complete */ 814 if (!tb_port_is_dpout(tunnel->dst_port)) { 815 tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n"); 816 goto err_deactivate; 817 } 818 819 if (!tb_dp_port_is_enabled(tunnel->dst_port)) 820 goto err_deactivate; 821 822 if (!tb_dp_port_hpd_is_active(tunnel->dst_port)) 823 goto err_deactivate; 824 825 if (port != tunnel->src_port) { 826 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); 827 goto err_deactivate; 828 } 829 830 tb_tunnel_dbg(tunnel, "discovered\n"); 831 return tunnel; 832 833 err_deactivate: 834 tb_tunnel_deactivate(tunnel); 835 err_free: 836 tb_tunnel_free(tunnel); 837 838 return NULL; 839 } 840 841 /** 842 * tb_tunnel_alloc_dp() - allocate a Display Port tunnel 843 * @tb: Pointer to the domain structure 844 * @in: DP in adapter port 845 * @out: DP out adapter port 846 * @max_up: Maximum available upstream bandwidth for the DP tunnel (%0 847 * if not limited) 848 * @max_down: Maximum available downstream bandwidth for the DP tunnel 849 * (%0 if not limited) 850 * 851 * Allocates a tunnel between @in and @out that is capable of tunneling 852 * Display Port traffic. 853 * 854 * Return: Returns a tb_tunnel on success or NULL on failure. 855 */ 856 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in, 857 struct tb_port *out, int max_up, 858 int max_down) 859 { 860 struct tb_tunnel *tunnel; 861 struct tb_path **paths; 862 struct tb_path *path; 863 864 if (WARN_ON(!in->cap_adap || !out->cap_adap)) 865 return NULL; 866 867 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); 868 if (!tunnel) 869 return NULL; 870 871 tunnel->init = tb_dp_xchg_caps; 872 tunnel->activate = tb_dp_activate; 873 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; 874 tunnel->src_port = in; 875 tunnel->dst_port = out; 876 tunnel->max_up = max_up; 877 tunnel->max_down = max_down; 878 879 paths = tunnel->paths; 880 881 path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID, 882 1, "Video"); 883 if (!path) 884 goto err_free; 885 tb_dp_init_video_path(path); 886 paths[TB_DP_VIDEO_PATH_OUT] = path; 887 888 path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out, 889 TB_DP_AUX_TX_HOPID, 1, "AUX TX"); 890 if (!path) 891 goto err_free; 892 tb_dp_init_aux_path(path); 893 paths[TB_DP_AUX_PATH_OUT] = path; 894 895 path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in, 896 TB_DP_AUX_RX_HOPID, 1, "AUX RX"); 897 if (!path) 898 goto err_free; 899 tb_dp_init_aux_path(path); 900 paths[TB_DP_AUX_PATH_IN] = path; 901 902 return tunnel; 903 904 err_free: 905 tb_tunnel_free(tunnel); 906 return NULL; 907 } 908 909 static unsigned int tb_dma_available_credits(const struct tb_port *port) 910 { 911 const struct tb_switch *sw = port->sw; 912 int credits; 913 914 credits = tb_available_credits(port, NULL); 915 if (tb_acpi_may_tunnel_pcie()) 916 credits -= sw->max_pcie_credits; 917 credits -= port->dma_credits; 918 919 return credits > 0 ? credits : 0; 920 } 921 922 static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits) 923 { 924 struct tb_port *port = hop->in_port; 925 926 if (tb_port_use_credit_allocation(port)) { 927 unsigned int available = tb_dma_available_credits(port); 928 929 /* 930 * Need to have at least TB_MIN_DMA_CREDITS, otherwise 931 * DMA path cannot be established. 932 */ 933 if (available < TB_MIN_DMA_CREDITS) 934 return -ENOSPC; 935 936 while (credits > available) 937 credits--; 938 939 tb_port_dbg(port, "reserving %u credits for DMA path\n", 940 credits); 941 942 port->dma_credits += credits; 943 } else { 944 if (tb_port_is_null(port)) 945 credits = port->bonded ? 14 : 6; 946 else 947 credits = min(port->total_credits, credits); 948 } 949 950 hop->initial_credits = credits; 951 return 0; 952 } 953 954 /* Path from lane adapter to NHI */ 955 static int tb_dma_init_rx_path(struct tb_path *path, unsigned int credits) 956 { 957 struct tb_path_hop *hop; 958 unsigned int i, tmp; 959 960 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; 961 path->ingress_fc_enable = TB_PATH_ALL; 962 path->egress_shared_buffer = TB_PATH_NONE; 963 path->ingress_shared_buffer = TB_PATH_NONE; 964 path->priority = 5; 965 path->weight = 1; 966 path->clear_fc = true; 967 968 /* 969 * First lane adapter is the one connected to the remote host. 970 * We don't tunnel other traffic over this link so can use all 971 * the credits (except the ones reserved for control traffic). 972 */ 973 hop = &path->hops[0]; 974 tmp = min(tb_usable_credits(hop->in_port), credits); 975 hop->initial_credits = tmp; 976 hop->in_port->dma_credits += tmp; 977 978 for (i = 1; i < path->path_length; i++) { 979 int ret; 980 981 ret = tb_dma_reserve_credits(&path->hops[i], credits); 982 if (ret) 983 return ret; 984 } 985 986 return 0; 987 } 988 989 /* Path from NHI to lane adapter */ 990 static int tb_dma_init_tx_path(struct tb_path *path, unsigned int credits) 991 { 992 struct tb_path_hop *hop; 993 994 path->egress_fc_enable = TB_PATH_ALL; 995 path->ingress_fc_enable = TB_PATH_ALL; 996 path->egress_shared_buffer = TB_PATH_NONE; 997 path->ingress_shared_buffer = TB_PATH_NONE; 998 path->priority = 5; 999 path->weight = 1; 1000 path->clear_fc = true; 1001 1002 tb_path_for_each_hop(path, hop) { 1003 int ret; 1004 1005 ret = tb_dma_reserve_credits(hop, credits); 1006 if (ret) 1007 return ret; 1008 } 1009 1010 return 0; 1011 } 1012 1013 static void tb_dma_release_credits(struct tb_path_hop *hop) 1014 { 1015 struct tb_port *port = hop->in_port; 1016 1017 if (tb_port_use_credit_allocation(port)) { 1018 port->dma_credits -= hop->initial_credits; 1019 1020 tb_port_dbg(port, "released %u DMA path credits\n", 1021 hop->initial_credits); 1022 } 1023 } 1024 1025 static void tb_dma_deinit_path(struct tb_path *path) 1026 { 1027 struct tb_path_hop *hop; 1028 1029 tb_path_for_each_hop(path, hop) 1030 tb_dma_release_credits(hop); 1031 } 1032 1033 static void tb_dma_deinit(struct tb_tunnel *tunnel) 1034 { 1035 int i; 1036 1037 for (i = 0; i < tunnel->npaths; i++) { 1038 if (!tunnel->paths[i]) 1039 continue; 1040 tb_dma_deinit_path(tunnel->paths[i]); 1041 } 1042 } 1043 1044 /** 1045 * tb_tunnel_alloc_dma() - allocate a DMA tunnel 1046 * @tb: Pointer to the domain structure 1047 * @nhi: Host controller port 1048 * @dst: Destination null port which the other domain is connected to 1049 * @transmit_path: HopID used for transmitting packets 1050 * @transmit_ring: NHI ring number used to send packets towards the 1051 * other domain. Set to %-1 if TX path is not needed. 1052 * @receive_path: HopID used for receiving packets 1053 * @receive_ring: NHI ring number used to receive packets from the 1054 * other domain. Set to %-1 if RX path is not needed. 1055 * 1056 * Return: Returns a tb_tunnel on success or NULL on failure. 1057 */ 1058 struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi, 1059 struct tb_port *dst, int transmit_path, 1060 int transmit_ring, int receive_path, 1061 int receive_ring) 1062 { 1063 struct tb_tunnel *tunnel; 1064 size_t npaths = 0, i = 0; 1065 struct tb_path *path; 1066 int credits; 1067 1068 if (receive_ring > 0) 1069 npaths++; 1070 if (transmit_ring > 0) 1071 npaths++; 1072 1073 if (WARN_ON(!npaths)) 1074 return NULL; 1075 1076 tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA); 1077 if (!tunnel) 1078 return NULL; 1079 1080 tunnel->src_port = nhi; 1081 tunnel->dst_port = dst; 1082 tunnel->deinit = tb_dma_deinit; 1083 1084 credits = min_not_zero(TB_DMA_CREDITS, nhi->sw->max_dma_credits); 1085 1086 if (receive_ring > 0) { 1087 path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0, 1088 "DMA RX"); 1089 if (!path) 1090 goto err_free; 1091 tunnel->paths[i++] = path; 1092 if (tb_dma_init_rx_path(path, credits)) { 1093 tb_tunnel_dbg(tunnel, "not enough buffers for RX path\n"); 1094 goto err_free; 1095 } 1096 } 1097 1098 if (transmit_ring > 0) { 1099 path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0, 1100 "DMA TX"); 1101 if (!path) 1102 goto err_free; 1103 tunnel->paths[i++] = path; 1104 if (tb_dma_init_tx_path(path, credits)) { 1105 tb_tunnel_dbg(tunnel, "not enough buffers for TX path\n"); 1106 goto err_free; 1107 } 1108 } 1109 1110 return tunnel; 1111 1112 err_free: 1113 tb_tunnel_free(tunnel); 1114 return NULL; 1115 } 1116 1117 /** 1118 * tb_tunnel_match_dma() - Match DMA tunnel 1119 * @tunnel: Tunnel to match 1120 * @transmit_path: HopID used for transmitting packets. Pass %-1 to ignore. 1121 * @transmit_ring: NHI ring number used to send packets towards the 1122 * other domain. Pass %-1 to ignore. 1123 * @receive_path: HopID used for receiving packets. Pass %-1 to ignore. 1124 * @receive_ring: NHI ring number used to receive packets from the 1125 * other domain. Pass %-1 to ignore. 1126 * 1127 * This function can be used to match specific DMA tunnel, if there are 1128 * multiple DMA tunnels going through the same XDomain connection. 1129 * Returns true if there is match and false otherwise. 1130 */ 1131 bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path, 1132 int transmit_ring, int receive_path, int receive_ring) 1133 { 1134 const struct tb_path *tx_path = NULL, *rx_path = NULL; 1135 int i; 1136 1137 if (!receive_ring || !transmit_ring) 1138 return false; 1139 1140 for (i = 0; i < tunnel->npaths; i++) { 1141 const struct tb_path *path = tunnel->paths[i]; 1142 1143 if (!path) 1144 continue; 1145 1146 if (tb_port_is_nhi(path->hops[0].in_port)) 1147 tx_path = path; 1148 else if (tb_port_is_nhi(path->hops[path->path_length - 1].out_port)) 1149 rx_path = path; 1150 } 1151 1152 if (transmit_ring > 0 || transmit_path > 0) { 1153 if (!tx_path) 1154 return false; 1155 if (transmit_ring > 0 && 1156 (tx_path->hops[0].in_hop_index != transmit_ring)) 1157 return false; 1158 if (transmit_path > 0 && 1159 (tx_path->hops[tx_path->path_length - 1].next_hop_index != transmit_path)) 1160 return false; 1161 } 1162 1163 if (receive_ring > 0 || receive_path > 0) { 1164 if (!rx_path) 1165 return false; 1166 if (receive_path > 0 && 1167 (rx_path->hops[0].in_hop_index != receive_path)) 1168 return false; 1169 if (receive_ring > 0 && 1170 (rx_path->hops[rx_path->path_length - 1].next_hop_index != receive_ring)) 1171 return false; 1172 } 1173 1174 return true; 1175 } 1176 1177 static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down) 1178 { 1179 int ret, up_max_rate, down_max_rate; 1180 1181 ret = usb4_usb3_port_max_link_rate(up); 1182 if (ret < 0) 1183 return ret; 1184 up_max_rate = ret; 1185 1186 ret = usb4_usb3_port_max_link_rate(down); 1187 if (ret < 0) 1188 return ret; 1189 down_max_rate = ret; 1190 1191 return min(up_max_rate, down_max_rate); 1192 } 1193 1194 static int tb_usb3_init(struct tb_tunnel *tunnel) 1195 { 1196 tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n", 1197 tunnel->allocated_up, tunnel->allocated_down); 1198 1199 return usb4_usb3_port_allocate_bandwidth(tunnel->src_port, 1200 &tunnel->allocated_up, 1201 &tunnel->allocated_down); 1202 } 1203 1204 static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate) 1205 { 1206 int res; 1207 1208 res = tb_usb3_port_enable(tunnel->src_port, activate); 1209 if (res) 1210 return res; 1211 1212 if (tb_port_is_usb3_up(tunnel->dst_port)) 1213 return tb_usb3_port_enable(tunnel->dst_port, activate); 1214 1215 return 0; 1216 } 1217 1218 static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel, 1219 int *consumed_up, int *consumed_down) 1220 { 1221 int pcie_enabled = tb_acpi_may_tunnel_pcie(); 1222 1223 /* 1224 * PCIe tunneling, if enabled, affects the USB3 bandwidth so 1225 * take that it into account here. 1226 */ 1227 *consumed_up = tunnel->allocated_up * (3 + pcie_enabled) / 3; 1228 *consumed_down = tunnel->allocated_down * (3 + pcie_enabled) / 3; 1229 return 0; 1230 } 1231 1232 static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel) 1233 { 1234 int ret; 1235 1236 ret = usb4_usb3_port_release_bandwidth(tunnel->src_port, 1237 &tunnel->allocated_up, 1238 &tunnel->allocated_down); 1239 if (ret) 1240 return ret; 1241 1242 tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n", 1243 tunnel->allocated_up, tunnel->allocated_down); 1244 return 0; 1245 } 1246 1247 static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel, 1248 int *available_up, 1249 int *available_down) 1250 { 1251 int ret, max_rate, allocate_up, allocate_down; 1252 1253 ret = usb4_usb3_port_actual_link_rate(tunnel->src_port); 1254 if (ret < 0) { 1255 tb_tunnel_warn(tunnel, "failed to read actual link rate\n"); 1256 return; 1257 } else if (!ret) { 1258 /* Use maximum link rate if the link valid is not set */ 1259 ret = usb4_usb3_port_max_link_rate(tunnel->src_port); 1260 if (ret < 0) { 1261 tb_tunnel_warn(tunnel, "failed to read maximum link rate\n"); 1262 return; 1263 } 1264 } 1265 1266 /* 1267 * 90% of the max rate can be allocated for isochronous 1268 * transfers. 1269 */ 1270 max_rate = ret * 90 / 100; 1271 1272 /* No need to reclaim if already at maximum */ 1273 if (tunnel->allocated_up >= max_rate && 1274 tunnel->allocated_down >= max_rate) 1275 return; 1276 1277 /* Don't go lower than what is already allocated */ 1278 allocate_up = min(max_rate, *available_up); 1279 if (allocate_up < tunnel->allocated_up) 1280 allocate_up = tunnel->allocated_up; 1281 1282 allocate_down = min(max_rate, *available_down); 1283 if (allocate_down < tunnel->allocated_down) 1284 allocate_down = tunnel->allocated_down; 1285 1286 /* If no changes no need to do more */ 1287 if (allocate_up == tunnel->allocated_up && 1288 allocate_down == tunnel->allocated_down) 1289 return; 1290 1291 ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up, 1292 &allocate_down); 1293 if (ret) { 1294 tb_tunnel_info(tunnel, "failed to allocate bandwidth\n"); 1295 return; 1296 } 1297 1298 tunnel->allocated_up = allocate_up; 1299 *available_up -= tunnel->allocated_up; 1300 1301 tunnel->allocated_down = allocate_down; 1302 *available_down -= tunnel->allocated_down; 1303 1304 tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n", 1305 tunnel->allocated_up, tunnel->allocated_down); 1306 } 1307 1308 static void tb_usb3_init_credits(struct tb_path_hop *hop) 1309 { 1310 struct tb_port *port = hop->in_port; 1311 struct tb_switch *sw = port->sw; 1312 unsigned int credits; 1313 1314 if (tb_port_use_credit_allocation(port)) { 1315 credits = sw->max_usb3_credits; 1316 } else { 1317 if (tb_port_is_null(port)) 1318 credits = port->bonded ? 32 : 16; 1319 else 1320 credits = 7; 1321 } 1322 1323 hop->initial_credits = credits; 1324 } 1325 1326 static void tb_usb3_init_path(struct tb_path *path) 1327 { 1328 struct tb_path_hop *hop; 1329 1330 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; 1331 path->egress_shared_buffer = TB_PATH_NONE; 1332 path->ingress_fc_enable = TB_PATH_ALL; 1333 path->ingress_shared_buffer = TB_PATH_NONE; 1334 path->priority = 3; 1335 path->weight = 3; 1336 path->drop_packages = 0; 1337 1338 tb_path_for_each_hop(path, hop) 1339 tb_usb3_init_credits(hop); 1340 } 1341 1342 /** 1343 * tb_tunnel_discover_usb3() - Discover existing USB3 tunnels 1344 * @tb: Pointer to the domain structure 1345 * @down: USB3 downstream adapter 1346 * 1347 * If @down adapter is active, follows the tunnel to the USB3 upstream 1348 * adapter and back. Returns the discovered tunnel or %NULL if there was 1349 * no tunnel. 1350 */ 1351 struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down) 1352 { 1353 struct tb_tunnel *tunnel; 1354 struct tb_path *path; 1355 1356 if (!tb_usb3_port_is_enabled(down)) 1357 return NULL; 1358 1359 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); 1360 if (!tunnel) 1361 return NULL; 1362 1363 tunnel->activate = tb_usb3_activate; 1364 tunnel->src_port = down; 1365 1366 /* 1367 * Discover both paths even if they are not complete. We will 1368 * clean them up by calling tb_tunnel_deactivate() below in that 1369 * case. 1370 */ 1371 path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1, 1372 &tunnel->dst_port, "USB3 Down"); 1373 if (!path) { 1374 /* Just disable the downstream port */ 1375 tb_usb3_port_enable(down, false); 1376 goto err_free; 1377 } 1378 tunnel->paths[TB_USB3_PATH_DOWN] = path; 1379 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]); 1380 1381 path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL, 1382 "USB3 Up"); 1383 if (!path) 1384 goto err_deactivate; 1385 tunnel->paths[TB_USB3_PATH_UP] = path; 1386 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]); 1387 1388 /* Validate that the tunnel is complete */ 1389 if (!tb_port_is_usb3_up(tunnel->dst_port)) { 1390 tb_port_warn(tunnel->dst_port, 1391 "path does not end on an USB3 adapter, cleaning up\n"); 1392 goto err_deactivate; 1393 } 1394 1395 if (down != tunnel->src_port) { 1396 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); 1397 goto err_deactivate; 1398 } 1399 1400 if (!tb_usb3_port_is_enabled(tunnel->dst_port)) { 1401 tb_tunnel_warn(tunnel, 1402 "tunnel is not fully activated, cleaning up\n"); 1403 goto err_deactivate; 1404 } 1405 1406 if (!tb_route(down->sw)) { 1407 int ret; 1408 1409 /* 1410 * Read the initial bandwidth allocation for the first 1411 * hop tunnel. 1412 */ 1413 ret = usb4_usb3_port_allocated_bandwidth(down, 1414 &tunnel->allocated_up, &tunnel->allocated_down); 1415 if (ret) 1416 goto err_deactivate; 1417 1418 tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n", 1419 tunnel->allocated_up, tunnel->allocated_down); 1420 1421 tunnel->init = tb_usb3_init; 1422 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; 1423 tunnel->release_unused_bandwidth = 1424 tb_usb3_release_unused_bandwidth; 1425 tunnel->reclaim_available_bandwidth = 1426 tb_usb3_reclaim_available_bandwidth; 1427 } 1428 1429 tb_tunnel_dbg(tunnel, "discovered\n"); 1430 return tunnel; 1431 1432 err_deactivate: 1433 tb_tunnel_deactivate(tunnel); 1434 err_free: 1435 tb_tunnel_free(tunnel); 1436 1437 return NULL; 1438 } 1439 1440 /** 1441 * tb_tunnel_alloc_usb3() - allocate a USB3 tunnel 1442 * @tb: Pointer to the domain structure 1443 * @up: USB3 upstream adapter port 1444 * @down: USB3 downstream adapter port 1445 * @max_up: Maximum available upstream bandwidth for the USB3 tunnel (%0 1446 * if not limited). 1447 * @max_down: Maximum available downstream bandwidth for the USB3 tunnel 1448 * (%0 if not limited). 1449 * 1450 * Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and 1451 * @TB_TYPE_USB3_DOWN. 1452 * 1453 * Return: Returns a tb_tunnel on success or %NULL on failure. 1454 */ 1455 struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up, 1456 struct tb_port *down, int max_up, 1457 int max_down) 1458 { 1459 struct tb_tunnel *tunnel; 1460 struct tb_path *path; 1461 int max_rate = 0; 1462 1463 /* 1464 * Check that we have enough bandwidth available for the new 1465 * USB3 tunnel. 1466 */ 1467 if (max_up > 0 || max_down > 0) { 1468 max_rate = tb_usb3_max_link_rate(down, up); 1469 if (max_rate < 0) 1470 return NULL; 1471 1472 /* Only 90% can be allocated for USB3 isochronous transfers */ 1473 max_rate = max_rate * 90 / 100; 1474 tb_port_dbg(up, "required bandwidth for USB3 tunnel %d Mb/s\n", 1475 max_rate); 1476 1477 if (max_rate > max_up || max_rate > max_down) { 1478 tb_port_warn(up, "not enough bandwidth for USB3 tunnel\n"); 1479 return NULL; 1480 } 1481 } 1482 1483 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); 1484 if (!tunnel) 1485 return NULL; 1486 1487 tunnel->activate = tb_usb3_activate; 1488 tunnel->src_port = down; 1489 tunnel->dst_port = up; 1490 tunnel->max_up = max_up; 1491 tunnel->max_down = max_down; 1492 1493 path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0, 1494 "USB3 Down"); 1495 if (!path) { 1496 tb_tunnel_free(tunnel); 1497 return NULL; 1498 } 1499 tb_usb3_init_path(path); 1500 tunnel->paths[TB_USB3_PATH_DOWN] = path; 1501 1502 path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0, 1503 "USB3 Up"); 1504 if (!path) { 1505 tb_tunnel_free(tunnel); 1506 return NULL; 1507 } 1508 tb_usb3_init_path(path); 1509 tunnel->paths[TB_USB3_PATH_UP] = path; 1510 1511 if (!tb_route(down->sw)) { 1512 tunnel->allocated_up = max_rate; 1513 tunnel->allocated_down = max_rate; 1514 1515 tunnel->init = tb_usb3_init; 1516 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; 1517 tunnel->release_unused_bandwidth = 1518 tb_usb3_release_unused_bandwidth; 1519 tunnel->reclaim_available_bandwidth = 1520 tb_usb3_reclaim_available_bandwidth; 1521 } 1522 1523 return tunnel; 1524 } 1525 1526 /** 1527 * tb_tunnel_free() - free a tunnel 1528 * @tunnel: Tunnel to be freed 1529 * 1530 * Frees a tunnel. The tunnel does not need to be deactivated. 1531 */ 1532 void tb_tunnel_free(struct tb_tunnel *tunnel) 1533 { 1534 int i; 1535 1536 if (!tunnel) 1537 return; 1538 1539 if (tunnel->deinit) 1540 tunnel->deinit(tunnel); 1541 1542 for (i = 0; i < tunnel->npaths; i++) { 1543 if (tunnel->paths[i]) 1544 tb_path_free(tunnel->paths[i]); 1545 } 1546 1547 kfree(tunnel->paths); 1548 kfree(tunnel); 1549 } 1550 1551 /** 1552 * tb_tunnel_is_invalid - check whether an activated path is still valid 1553 * @tunnel: Tunnel to check 1554 */ 1555 bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel) 1556 { 1557 int i; 1558 1559 for (i = 0; i < tunnel->npaths; i++) { 1560 WARN_ON(!tunnel->paths[i]->activated); 1561 if (tb_path_is_invalid(tunnel->paths[i])) 1562 return true; 1563 } 1564 1565 return false; 1566 } 1567 1568 /** 1569 * tb_tunnel_restart() - activate a tunnel after a hardware reset 1570 * @tunnel: Tunnel to restart 1571 * 1572 * Return: 0 on success and negative errno in case if failure 1573 */ 1574 int tb_tunnel_restart(struct tb_tunnel *tunnel) 1575 { 1576 int res, i; 1577 1578 tb_tunnel_dbg(tunnel, "activating\n"); 1579 1580 /* 1581 * Make sure all paths are properly disabled before enabling 1582 * them again. 1583 */ 1584 for (i = 0; i < tunnel->npaths; i++) { 1585 if (tunnel->paths[i]->activated) { 1586 tb_path_deactivate(tunnel->paths[i]); 1587 tunnel->paths[i]->activated = false; 1588 } 1589 } 1590 1591 if (tunnel->init) { 1592 res = tunnel->init(tunnel); 1593 if (res) 1594 return res; 1595 } 1596 1597 for (i = 0; i < tunnel->npaths; i++) { 1598 res = tb_path_activate(tunnel->paths[i]); 1599 if (res) 1600 goto err; 1601 } 1602 1603 if (tunnel->activate) { 1604 res = tunnel->activate(tunnel, true); 1605 if (res) 1606 goto err; 1607 } 1608 1609 return 0; 1610 1611 err: 1612 tb_tunnel_warn(tunnel, "activation failed\n"); 1613 tb_tunnel_deactivate(tunnel); 1614 return res; 1615 } 1616 1617 /** 1618 * tb_tunnel_activate() - activate a tunnel 1619 * @tunnel: Tunnel to activate 1620 * 1621 * Return: Returns 0 on success or an error code on failure. 1622 */ 1623 int tb_tunnel_activate(struct tb_tunnel *tunnel) 1624 { 1625 int i; 1626 1627 for (i = 0; i < tunnel->npaths; i++) { 1628 if (tunnel->paths[i]->activated) { 1629 tb_tunnel_WARN(tunnel, 1630 "trying to activate an already activated tunnel\n"); 1631 return -EINVAL; 1632 } 1633 } 1634 1635 return tb_tunnel_restart(tunnel); 1636 } 1637 1638 /** 1639 * tb_tunnel_deactivate() - deactivate a tunnel 1640 * @tunnel: Tunnel to deactivate 1641 */ 1642 void tb_tunnel_deactivate(struct tb_tunnel *tunnel) 1643 { 1644 int i; 1645 1646 tb_tunnel_dbg(tunnel, "deactivating\n"); 1647 1648 if (tunnel->activate) 1649 tunnel->activate(tunnel, false); 1650 1651 for (i = 0; i < tunnel->npaths; i++) { 1652 if (tunnel->paths[i] && tunnel->paths[i]->activated) 1653 tb_path_deactivate(tunnel->paths[i]); 1654 } 1655 } 1656 1657 /** 1658 * tb_tunnel_port_on_path() - Does the tunnel go through port 1659 * @tunnel: Tunnel to check 1660 * @port: Port to check 1661 * 1662 * Returns true if @tunnel goes through @port (direction does not matter), 1663 * false otherwise. 1664 */ 1665 bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel, 1666 const struct tb_port *port) 1667 { 1668 int i; 1669 1670 for (i = 0; i < tunnel->npaths; i++) { 1671 if (!tunnel->paths[i]) 1672 continue; 1673 1674 if (tb_path_port_on_path(tunnel->paths[i], port)) 1675 return true; 1676 } 1677 1678 return false; 1679 } 1680 1681 static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel) 1682 { 1683 int i; 1684 1685 for (i = 0; i < tunnel->npaths; i++) { 1686 if (!tunnel->paths[i]) 1687 return false; 1688 if (!tunnel->paths[i]->activated) 1689 return false; 1690 } 1691 1692 return true; 1693 } 1694 1695 /** 1696 * tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel 1697 * @tunnel: Tunnel to check 1698 * @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port. 1699 * Can be %NULL. 1700 * @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port. 1701 * Can be %NULL. 1702 * 1703 * Stores the amount of isochronous bandwidth @tunnel consumes in 1704 * @consumed_up and @consumed_down. In case of success returns %0, 1705 * negative errno otherwise. 1706 */ 1707 int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, 1708 int *consumed_down) 1709 { 1710 int up_bw = 0, down_bw = 0; 1711 1712 if (!tb_tunnel_is_active(tunnel)) 1713 goto out; 1714 1715 if (tunnel->consumed_bandwidth) { 1716 int ret; 1717 1718 ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw); 1719 if (ret) 1720 return ret; 1721 1722 tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw, 1723 down_bw); 1724 } 1725 1726 out: 1727 if (consumed_up) 1728 *consumed_up = up_bw; 1729 if (consumed_down) 1730 *consumed_down = down_bw; 1731 1732 return 0; 1733 } 1734 1735 /** 1736 * tb_tunnel_release_unused_bandwidth() - Release unused bandwidth 1737 * @tunnel: Tunnel whose unused bandwidth to release 1738 * 1739 * If tunnel supports dynamic bandwidth management (USB3 tunnels at the 1740 * moment) this function makes it to release all the unused bandwidth. 1741 * 1742 * Returns %0 in case of success and negative errno otherwise. 1743 */ 1744 int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel) 1745 { 1746 if (!tb_tunnel_is_active(tunnel)) 1747 return 0; 1748 1749 if (tunnel->release_unused_bandwidth) { 1750 int ret; 1751 1752 ret = tunnel->release_unused_bandwidth(tunnel); 1753 if (ret) 1754 return ret; 1755 } 1756 1757 return 0; 1758 } 1759 1760 /** 1761 * tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth 1762 * @tunnel: Tunnel reclaiming available bandwidth 1763 * @available_up: Available upstream bandwidth (in Mb/s) 1764 * @available_down: Available downstream bandwidth (in Mb/s) 1765 * 1766 * Reclaims bandwidth from @available_up and @available_down and updates 1767 * the variables accordingly (e.g decreases both according to what was 1768 * reclaimed by the tunnel). If nothing was reclaimed the values are 1769 * kept as is. 1770 */ 1771 void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel, 1772 int *available_up, 1773 int *available_down) 1774 { 1775 if (!tb_tunnel_is_active(tunnel)) 1776 return; 1777 1778 if (tunnel->reclaim_available_bandwidth) 1779 tunnel->reclaim_available_bandwidth(tunnel, available_up, 1780 available_down); 1781 } 1782