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1// SPDX-License-Identifier: GPL-2.02/*3 * Thunderbolt driver - Tunneling support4 *5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>6 * Copyright (C) 2019, Intel Corporation7 */8 9#include <linux/delay.h>10#include <linux/slab.h>11#include <linux/list.h>12#include <linux/ktime.h>13#include <linux/string_helpers.h>14 15#include "tunnel.h"16#include "tb.h"17 18/* PCIe adapters use always HopID of 8 for both directions */19#define TB_PCI_HOPID 820 21#define TB_PCI_PATH_DOWN 022#define TB_PCI_PATH_UP 123 24#define TB_PCI_PRIORITY 325#define TB_PCI_WEIGHT 126 27/* USB3 adapters use always HopID of 8 for both directions */28#define TB_USB3_HOPID 829 30#define TB_USB3_PATH_DOWN 031#define TB_USB3_PATH_UP 132 33#define TB_USB3_PRIORITY 334#define TB_USB3_WEIGHT 235 36/* DP adapters use HopID 8 for AUX and 9 for Video */37#define TB_DP_AUX_TX_HOPID 838#define TB_DP_AUX_RX_HOPID 839#define TB_DP_VIDEO_HOPID 940 41#define TB_DP_VIDEO_PATH_OUT 042#define TB_DP_AUX_PATH_OUT 143#define TB_DP_AUX_PATH_IN 244 45#define TB_DP_VIDEO_PRIORITY 146#define TB_DP_VIDEO_WEIGHT 147 48#define TB_DP_AUX_PRIORITY 249#define TB_DP_AUX_WEIGHT 150 51/* Minimum number of credits needed for PCIe path */52#define TB_MIN_PCIE_CREDITS 6U53/*54 * Number of credits we try to allocate for each DMA path if not limited55 * by the host router baMaxHI.56 */57#define TB_DMA_CREDITS 1458/* Minimum number of credits for DMA path */59#define TB_MIN_DMA_CREDITS 160 61#define TB_DMA_PRIORITY 562#define TB_DMA_WEIGHT 163 64/*65 * Reserve additional bandwidth for USB 3.x and PCIe bulk traffic66 * according to USB4 v2 Connection Manager guide. This ends up reserving67 * 1500 Mb/s for PCIe and 3000 Mb/s for USB 3.x taking weights into68 * account.69 */70#define USB4_V2_PCI_MIN_BANDWIDTH (1500 * TB_PCI_WEIGHT)71#define USB4_V2_USB3_MIN_BANDWIDTH (1500 * TB_USB3_WEIGHT)72 73static unsigned int dma_credits = TB_DMA_CREDITS;74module_param(dma_credits, uint, 0444);75MODULE_PARM_DESC(dma_credits, "specify custom credits for DMA tunnels (default: "76 __MODULE_STRING(TB_DMA_CREDITS) ")");77 78static bool bw_alloc_mode = true;79module_param(bw_alloc_mode, bool, 0444);80MODULE_PARM_DESC(bw_alloc_mode,81 "enable bandwidth allocation mode if supported (default: true)");82 83static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };84 85static inline unsigned int tb_usable_credits(const struct tb_port *port)86{87 return port->total_credits - port->ctl_credits;88}89 90/**91 * tb_available_credits() - Available credits for PCIe and DMA92 * @port: Lane adapter to check93 * @max_dp_streams: If non-%NULL stores maximum number of simultaneous DP94 * streams possible through this lane adapter95 */96static unsigned int tb_available_credits(const struct tb_port *port,97 size_t *max_dp_streams)98{99 const struct tb_switch *sw = port->sw;100 int credits, usb3, pcie, spare;101 size_t ndp;102 103 usb3 = tb_acpi_may_tunnel_usb3() ? sw->max_usb3_credits : 0;104 pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0;105 106 if (tb_acpi_is_xdomain_allowed()) {107 spare = min_not_zero(sw->max_dma_credits, dma_credits);108 /* Add some credits for potential second DMA tunnel */109 spare += TB_MIN_DMA_CREDITS;110 } else {111 spare = 0;112 }113 114 credits = tb_usable_credits(port);115 if (tb_acpi_may_tunnel_dp()) {116 /*117 * Maximum number of DP streams possible through the118 * lane adapter.119 */120 if (sw->min_dp_aux_credits + sw->min_dp_main_credits)121 ndp = (credits - (usb3 + pcie + spare)) /122 (sw->min_dp_aux_credits + sw->min_dp_main_credits);123 else124 ndp = 0;125 } else {126 ndp = 0;127 }128 credits -= ndp * (sw->min_dp_aux_credits + sw->min_dp_main_credits);129 credits -= usb3;130 131 if (max_dp_streams)132 *max_dp_streams = ndp;133 134 return credits > 0 ? credits : 0;135}136 137static void tb_init_pm_support(struct tb_path_hop *hop)138{139 struct tb_port *out_port = hop->out_port;140 struct tb_port *in_port = hop->in_port;141 142 if (tb_port_is_null(in_port) && tb_port_is_null(out_port) &&143 usb4_switch_version(in_port->sw) >= 2)144 hop->pm_support = true;145}146 147static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths,148 enum tb_tunnel_type type)149{150 struct tb_tunnel *tunnel;151 152 tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);153 if (!tunnel)154 return NULL;155 156 tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL);157 if (!tunnel->paths) {158 tb_tunnel_free(tunnel);159 return NULL;160 }161 162 INIT_LIST_HEAD(&tunnel->list);163 tunnel->tb = tb;164 tunnel->npaths = npaths;165 tunnel->type = type;166 167 return tunnel;168}169 170static int tb_pci_set_ext_encapsulation(struct tb_tunnel *tunnel, bool enable)171{172 struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);173 int ret;174 175 /* Only supported of both routers are at least USB4 v2 */176 if ((usb4_switch_version(tunnel->src_port->sw) < 2) ||177 (usb4_switch_version(tunnel->dst_port->sw) < 2))178 return 0;179 180 if (enable && tb_port_get_link_generation(port) < 4)181 return 0;182 183 ret = usb4_pci_port_set_ext_encapsulation(tunnel->src_port, enable);184 if (ret)185 return ret;186 187 /*188 * Downstream router could be unplugged so disable of encapsulation189 * in upstream router is still possible.190 */191 ret = usb4_pci_port_set_ext_encapsulation(tunnel->dst_port, enable);192 if (ret) {193 if (enable)194 return ret;195 if (ret != -ENODEV)196 return ret;197 }198 199 tb_tunnel_dbg(tunnel, "extended encapsulation %s\n",200 str_enabled_disabled(enable));201 return 0;202}203 204static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate)205{206 int res;207 208 if (activate) {209 res = tb_pci_set_ext_encapsulation(tunnel, activate);210 if (res)211 return res;212 }213 214 if (activate)215 res = tb_pci_port_enable(tunnel->dst_port, activate);216 else217 res = tb_pci_port_enable(tunnel->src_port, activate);218 if (res)219 return res;220 221 222 if (activate) {223 res = tb_pci_port_enable(tunnel->src_port, activate);224 if (res)225 return res;226 } else {227 /* Downstream router could be unplugged */228 tb_pci_port_enable(tunnel->dst_port, activate);229 }230 231 return activate ? 0 : tb_pci_set_ext_encapsulation(tunnel, activate);232}233 234static int tb_pci_init_credits(struct tb_path_hop *hop)235{236 struct tb_port *port = hop->in_port;237 struct tb_switch *sw = port->sw;238 unsigned int credits;239 240 if (tb_port_use_credit_allocation(port)) {241 unsigned int available;242 243 available = tb_available_credits(port, NULL);244 credits = min(sw->max_pcie_credits, available);245 246 if (credits < TB_MIN_PCIE_CREDITS)247 return -ENOSPC;248 249 credits = max(TB_MIN_PCIE_CREDITS, credits);250 } else {251 if (tb_port_is_null(port))252 credits = port->bonded ? 32 : 16;253 else254 credits = 7;255 }256 257 hop->initial_credits = credits;258 return 0;259}260 261static int tb_pci_init_path(struct tb_path *path)262{263 struct tb_path_hop *hop;264 265 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;266 path->egress_shared_buffer = TB_PATH_NONE;267 path->ingress_fc_enable = TB_PATH_ALL;268 path->ingress_shared_buffer = TB_PATH_NONE;269 path->priority = TB_PCI_PRIORITY;270 path->weight = TB_PCI_WEIGHT;271 path->drop_packages = 0;272 273 tb_path_for_each_hop(path, hop) {274 int ret;275 276 ret = tb_pci_init_credits(hop);277 if (ret)278 return ret;279 }280 281 return 0;282}283 284/**285 * tb_tunnel_discover_pci() - Discover existing PCIe tunnels286 * @tb: Pointer to the domain structure287 * @down: PCIe downstream adapter288 * @alloc_hopid: Allocate HopIDs from visited ports289 *290 * If @down adapter is active, follows the tunnel to the PCIe upstream291 * adapter and back. Returns the discovered tunnel or %NULL if there was292 * no tunnel.293 */294struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down,295 bool alloc_hopid)296{297 struct tb_tunnel *tunnel;298 struct tb_path *path;299 300 if (!tb_pci_port_is_enabled(down))301 return NULL;302 303 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);304 if (!tunnel)305 return NULL;306 307 tunnel->activate = tb_pci_activate;308 tunnel->src_port = down;309 310 /*311 * Discover both paths even if they are not complete. We will312 * clean them up by calling tb_tunnel_deactivate() below in that313 * case.314 */315 path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1,316 &tunnel->dst_port, "PCIe Up", alloc_hopid);317 if (!path) {318 /* Just disable the downstream port */319 tb_pci_port_enable(down, false);320 goto err_free;321 }322 tunnel->paths[TB_PCI_PATH_UP] = path;323 if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP]))324 goto err_free;325 326 path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL,327 "PCIe Down", alloc_hopid);328 if (!path)329 goto err_deactivate;330 tunnel->paths[TB_PCI_PATH_DOWN] = path;331 if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN]))332 goto err_deactivate;333 334 /* Validate that the tunnel is complete */335 if (!tb_port_is_pcie_up(tunnel->dst_port)) {336 tb_port_warn(tunnel->dst_port,337 "path does not end on a PCIe adapter, cleaning up\n");338 goto err_deactivate;339 }340 341 if (down != tunnel->src_port) {342 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");343 goto err_deactivate;344 }345 346 if (!tb_pci_port_is_enabled(tunnel->dst_port)) {347 tb_tunnel_warn(tunnel,348 "tunnel is not fully activated, cleaning up\n");349 goto err_deactivate;350 }351 352 tb_tunnel_dbg(tunnel, "discovered\n");353 return tunnel;354 355err_deactivate:356 tb_tunnel_deactivate(tunnel);357err_free:358 tb_tunnel_free(tunnel);359 360 return NULL;361}362 363/**364 * tb_tunnel_alloc_pci() - allocate a pci tunnel365 * @tb: Pointer to the domain structure366 * @up: PCIe upstream adapter port367 * @down: PCIe downstream adapter port368 *369 * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and370 * TB_TYPE_PCIE_DOWN.371 *372 * Return: Returns a tb_tunnel on success or NULL on failure.373 */374struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,375 struct tb_port *down)376{377 struct tb_tunnel *tunnel;378 struct tb_path *path;379 380 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);381 if (!tunnel)382 return NULL;383 384 tunnel->activate = tb_pci_activate;385 tunnel->src_port = down;386 tunnel->dst_port = up;387 388 path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0,389 "PCIe Down");390 if (!path)391 goto err_free;392 tunnel->paths[TB_PCI_PATH_DOWN] = path;393 if (tb_pci_init_path(path))394 goto err_free;395 396 path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0,397 "PCIe Up");398 if (!path)399 goto err_free;400 tunnel->paths[TB_PCI_PATH_UP] = path;401 if (tb_pci_init_path(path))402 goto err_free;403 404 return tunnel;405 406err_free:407 tb_tunnel_free(tunnel);408 return NULL;409}410 411/**412 * tb_tunnel_reserved_pci() - Amount of bandwidth to reserve for PCIe413 * @port: Lane 0 adapter414 * @reserved_up: Upstream bandwidth in Mb/s to reserve415 * @reserved_down: Downstream bandwidth in Mb/s to reserve416 *417 * Can be called to any connected lane 0 adapter to find out how much418 * bandwidth needs to be left in reserve for possible PCIe bulk traffic.419 * Returns true if there is something to be reserved and writes the420 * amount to @reserved_down/@reserved_up. Otherwise returns false and421 * does not touch the parameters.422 */423bool tb_tunnel_reserved_pci(struct tb_port *port, int *reserved_up,424 int *reserved_down)425{426 if (WARN_ON_ONCE(!port->remote))427 return false;428 429 if (!tb_acpi_may_tunnel_pcie())430 return false;431 432 if (tb_port_get_link_generation(port) < 4)433 return false;434 435 /* Must have PCIe adapters */436 if (tb_is_upstream_port(port)) {437 if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_UP))438 return false;439 if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_DOWN))440 return false;441 } else {442 if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_DOWN))443 return false;444 if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_UP))445 return false;446 }447 448 *reserved_up = USB4_V2_PCI_MIN_BANDWIDTH;449 *reserved_down = USB4_V2_PCI_MIN_BANDWIDTH;450 451 tb_port_dbg(port, "reserving %u/%u Mb/s for PCIe\n", *reserved_up,452 *reserved_down);453 return true;454}455 456static bool tb_dp_is_usb4(const struct tb_switch *sw)457{458 /* Titan Ridge DP adapters need the same treatment as USB4 */459 return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw);460}461 462static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out,463 int timeout_msec)464{465 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);466 u32 val;467 int ret;468 469 /* Both ends need to support this */470 if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw))471 return 0;472 473 ret = tb_port_read(out, &val, TB_CFG_PORT,474 out->cap_adap + DP_STATUS_CTRL, 1);475 if (ret)476 return ret;477 478 val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS;479 480 ret = tb_port_write(out, &val, TB_CFG_PORT,481 out->cap_adap + DP_STATUS_CTRL, 1);482 if (ret)483 return ret;484 485 do {486 ret = tb_port_read(out, &val, TB_CFG_PORT,487 out->cap_adap + DP_STATUS_CTRL, 1);488 if (ret)489 return ret;490 if (!(val & DP_STATUS_CTRL_CMHS))491 return 0;492 usleep_range(100, 150);493 } while (ktime_before(ktime_get(), timeout));494 495 return -ETIMEDOUT;496}497 498/*499 * Returns maximum possible rate from capability supporting only DP 2.0500 * and below. Used when DP BW allocation mode is not enabled.501 */502static inline u32 tb_dp_cap_get_rate(u32 val)503{504 u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT;505 506 switch (rate) {507 case DP_COMMON_CAP_RATE_RBR:508 return 1620;509 case DP_COMMON_CAP_RATE_HBR:510 return 2700;511 case DP_COMMON_CAP_RATE_HBR2:512 return 5400;513 case DP_COMMON_CAP_RATE_HBR3:514 return 8100;515 default:516 return 0;517 }518}519 520/*521 * Returns maximum possible rate from capability supporting DP 2.1522 * UHBR20, 13.5 and 10 rates as well. Use only when DP BW allocation523 * mode is enabled.524 */525static inline u32 tb_dp_cap_get_rate_ext(u32 val)526{527 if (val & DP_COMMON_CAP_UHBR20)528 return 20000;529 else if (val & DP_COMMON_CAP_UHBR13_5)530 return 13500;531 else if (val & DP_COMMON_CAP_UHBR10)532 return 10000;533 534 return tb_dp_cap_get_rate(val);535}536 537static inline bool tb_dp_is_uhbr_rate(unsigned int rate)538{539 return rate >= 10000;540}541 542static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate)543{544 val &= ~DP_COMMON_CAP_RATE_MASK;545 switch (rate) {546 default:547 WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate);548 fallthrough;549 case 1620:550 val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT;551 break;552 case 2700:553 val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT;554 break;555 case 5400:556 val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT;557 break;558 case 8100:559 val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT;560 break;561 }562 return val;563}564 565static inline u32 tb_dp_cap_get_lanes(u32 val)566{567 u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT;568 569 switch (lanes) {570 case DP_COMMON_CAP_1_LANE:571 return 1;572 case DP_COMMON_CAP_2_LANES:573 return 2;574 case DP_COMMON_CAP_4_LANES:575 return 4;576 default:577 return 0;578 }579}580 581static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes)582{583 val &= ~DP_COMMON_CAP_LANES_MASK;584 switch (lanes) {585 default:586 WARN(1, "invalid number of lanes %u passed, defaulting to 1\n",587 lanes);588 fallthrough;589 case 1:590 val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT;591 break;592 case 2:593 val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT;594 break;595 case 4:596 val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT;597 break;598 }599 return val;600}601 602static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes)603{604 /* Tunneling removes the DP 8b/10b 128/132b encoding */605 if (tb_dp_is_uhbr_rate(rate))606 return rate * lanes * 128 / 132;607 return rate * lanes * 8 / 10;608}609 610static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes,611 u32 out_rate, u32 out_lanes, u32 *new_rate,612 u32 *new_lanes)613{614 static const u32 dp_bw[][2] = {615 /* Mb/s, lanes */616 { 8100, 4 }, /* 25920 Mb/s */617 { 5400, 4 }, /* 17280 Mb/s */618 { 8100, 2 }, /* 12960 Mb/s */619 { 2700, 4 }, /* 8640 Mb/s */620 { 5400, 2 }, /* 8640 Mb/s */621 { 8100, 1 }, /* 6480 Mb/s */622 { 1620, 4 }, /* 5184 Mb/s */623 { 5400, 1 }, /* 4320 Mb/s */624 { 2700, 2 }, /* 4320 Mb/s */625 { 1620, 2 }, /* 2592 Mb/s */626 { 2700, 1 }, /* 2160 Mb/s */627 { 1620, 1 }, /* 1296 Mb/s */628 };629 unsigned int i;630 631 /*632 * Find a combination that can fit into max_bw and does not633 * exceed the maximum rate and lanes supported by the DP OUT and634 * DP IN adapters.635 */636 for (i = 0; i < ARRAY_SIZE(dp_bw); i++) {637 if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes)638 continue;639 640 if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes)641 continue;642 643 if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) {644 *new_rate = dp_bw[i][0];645 *new_lanes = dp_bw[i][1];646 return 0;647 }648 }649 650 return -ENOSR;651}652 653static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)654{655 u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw;656 struct tb_port *out = tunnel->dst_port;657 struct tb_port *in = tunnel->src_port;658 int ret, max_bw;659 660 /*661 * Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for662 * newer generation hardware.663 */664 if (in->sw->generation < 2 || out->sw->generation < 2)665 return 0;666 667 /*668 * Perform connection manager handshake between IN and OUT ports669 * before capabilities exchange can take place.670 */671 ret = tb_dp_cm_handshake(in, out, 3000);672 if (ret)673 return ret;674 675 /* Read both DP_LOCAL_CAP registers */676 ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,677 in->cap_adap + DP_LOCAL_CAP, 1);678 if (ret)679 return ret;680 681 ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,682 out->cap_adap + DP_LOCAL_CAP, 1);683 if (ret)684 return ret;685 686 /* Write IN local caps to OUT remote caps */687 ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT,688 out->cap_adap + DP_REMOTE_CAP, 1);689 if (ret)690 return ret;691 692 in_rate = tb_dp_cap_get_rate(in_dp_cap);693 in_lanes = tb_dp_cap_get_lanes(in_dp_cap);694 tb_tunnel_dbg(tunnel,695 "DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",696 in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes));697 698 /*699 * If the tunnel bandwidth is limited (max_bw is set) then see700 * if we need to reduce bandwidth to fit there.701 */702 out_rate = tb_dp_cap_get_rate(out_dp_cap);703 out_lanes = tb_dp_cap_get_lanes(out_dp_cap);704 bw = tb_dp_bandwidth(out_rate, out_lanes);705 tb_tunnel_dbg(tunnel,706 "DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",707 out_rate, out_lanes, bw);708 709 if (tb_tunnel_direction_downstream(tunnel))710 max_bw = tunnel->max_down;711 else712 max_bw = tunnel->max_up;713 714 if (max_bw && bw > max_bw) {715 u32 new_rate, new_lanes, new_bw;716 717 ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes,718 out_rate, out_lanes, &new_rate,719 &new_lanes);720 if (ret) {721 tb_tunnel_info(tunnel, "not enough bandwidth\n");722 return ret;723 }724 725 new_bw = tb_dp_bandwidth(new_rate, new_lanes);726 tb_tunnel_dbg(tunnel,727 "bandwidth reduced to %u Mb/s x%u = %u Mb/s\n",728 new_rate, new_lanes, new_bw);729 730 /*731 * Set new rate and number of lanes before writing it to732 * the IN port remote caps.733 */734 out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate);735 out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes);736 }737 738 /*739 * Titan Ridge does not disable AUX timers when it gets740 * SET_CONFIG with SET_LTTPR_MODE set. This causes problems with741 * DP tunneling.742 */743 if (tb_route(out->sw) && tb_switch_is_titan_ridge(out->sw)) {744 out_dp_cap |= DP_COMMON_CAP_LTTPR_NS;745 tb_tunnel_dbg(tunnel, "disabling LTTPR\n");746 }747 748 return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,749 in->cap_adap + DP_REMOTE_CAP, 1);750}751 752static int tb_dp_bandwidth_alloc_mode_enable(struct tb_tunnel *tunnel)753{754 int ret, estimated_bw, granularity, tmp;755 struct tb_port *out = tunnel->dst_port;756 struct tb_port *in = tunnel->src_port;757 u32 out_dp_cap, out_rate, out_lanes;758 u32 in_dp_cap, in_rate, in_lanes;759 u32 rate, lanes;760 761 if (!bw_alloc_mode)762 return 0;763 764 ret = usb4_dp_port_set_cm_bandwidth_mode_supported(in, true);765 if (ret)766 return ret;767 768 ret = usb4_dp_port_set_group_id(in, in->group->index);769 if (ret)770 return ret;771 772 /*773 * Get the non-reduced rate and lanes based on the lowest774 * capability of both adapters.775 */776 ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,777 in->cap_adap + DP_LOCAL_CAP, 1);778 if (ret)779 return ret;780 781 ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,782 out->cap_adap + DP_LOCAL_CAP, 1);783 if (ret)784 return ret;785 786 in_rate = tb_dp_cap_get_rate(in_dp_cap);787 in_lanes = tb_dp_cap_get_lanes(in_dp_cap);788 out_rate = tb_dp_cap_get_rate(out_dp_cap);789 out_lanes = tb_dp_cap_get_lanes(out_dp_cap);790 791 rate = min(in_rate, out_rate);792 lanes = min(in_lanes, out_lanes);793 tmp = tb_dp_bandwidth(rate, lanes);794 795 tb_tunnel_dbg(tunnel, "non-reduced bandwidth %u Mb/s x%u = %u Mb/s\n",796 rate, lanes, tmp);797 798 ret = usb4_dp_port_set_nrd(in, rate, lanes);799 if (ret)800 return ret;801 802 /*803 * Pick up granularity that supports maximum possible bandwidth.804 * For that we use the UHBR rates too.805 */806 in_rate = tb_dp_cap_get_rate_ext(in_dp_cap);807 out_rate = tb_dp_cap_get_rate_ext(out_dp_cap);808 rate = min(in_rate, out_rate);809 tmp = tb_dp_bandwidth(rate, lanes);810 811 tb_tunnel_dbg(tunnel,812 "maximum bandwidth through allocation mode %u Mb/s x%u = %u Mb/s\n",813 rate, lanes, tmp);814 815 for (granularity = 250; tmp / granularity > 255 && granularity <= 1000;816 granularity *= 2)817 ;818 819 tb_tunnel_dbg(tunnel, "granularity %d Mb/s\n", granularity);820 821 /*822 * Returns -EINVAL if granularity above is outside of the823 * accepted ranges.824 */825 ret = usb4_dp_port_set_granularity(in, granularity);826 if (ret)827 return ret;828 829 /*830 * Bandwidth estimation is pretty much what we have in831 * max_up/down fields. For discovery we just read what the832 * estimation was set to.833 */834 if (tb_tunnel_direction_downstream(tunnel))835 estimated_bw = tunnel->max_down;836 else837 estimated_bw = tunnel->max_up;838 839 tb_tunnel_dbg(tunnel, "estimated bandwidth %d Mb/s\n", estimated_bw);840 841 ret = usb4_dp_port_set_estimated_bandwidth(in, estimated_bw);842 if (ret)843 return ret;844 845 /* Initial allocation should be 0 according the spec */846 ret = usb4_dp_port_allocate_bandwidth(in, 0);847 if (ret)848 return ret;849 850 tb_tunnel_dbg(tunnel, "bandwidth allocation mode enabled\n");851 return 0;852}853 854static int tb_dp_init(struct tb_tunnel *tunnel)855{856 struct tb_port *in = tunnel->src_port;857 struct tb_switch *sw = in->sw;858 struct tb *tb = in->sw->tb;859 int ret;860 861 ret = tb_dp_xchg_caps(tunnel);862 if (ret)863 return ret;864 865 if (!tb_switch_is_usb4(sw))866 return 0;867 868 if (!usb4_dp_port_bandwidth_mode_supported(in))869 return 0;870 871 tb_tunnel_dbg(tunnel, "bandwidth allocation mode supported\n");872 873 ret = usb4_dp_port_set_cm_id(in, tb->index);874 if (ret)875 return ret;876 877 return tb_dp_bandwidth_alloc_mode_enable(tunnel);878}879 880static void tb_dp_deinit(struct tb_tunnel *tunnel)881{882 struct tb_port *in = tunnel->src_port;883 884 if (!usb4_dp_port_bandwidth_mode_supported(in))885 return;886 if (usb4_dp_port_bandwidth_mode_enabled(in)) {887 usb4_dp_port_set_cm_bandwidth_mode_supported(in, false);888 tb_tunnel_dbg(tunnel, "bandwidth allocation mode disabled\n");889 }890}891 892static int tb_dp_activate(struct tb_tunnel *tunnel, bool active)893{894 int ret;895 896 if (active) {897 struct tb_path **paths;898 int last;899 900 paths = tunnel->paths;901 last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1;902 903 tb_dp_port_set_hops(tunnel->src_port,904 paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index,905 paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index,906 paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index);907 908 tb_dp_port_set_hops(tunnel->dst_port,909 paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index,910 paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index,911 paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index);912 } else {913 tb_dp_port_hpd_clear(tunnel->src_port);914 tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0);915 if (tb_port_is_dpout(tunnel->dst_port))916 tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0);917 }918 919 ret = tb_dp_port_enable(tunnel->src_port, active);920 if (ret)921 return ret;922 923 if (tb_port_is_dpout(tunnel->dst_port))924 return tb_dp_port_enable(tunnel->dst_port, active);925 926 return 0;927}928 929/**930 * tb_dp_bandwidth_mode_maximum_bandwidth() - Maximum possible bandwidth931 * @tunnel: DP tunnel to check932 * @max_bw_rounded: Maximum bandwidth in Mb/s rounded up to the next granularity933 *934 * Returns maximum possible bandwidth for this tunnel in Mb/s.935 */936static int tb_dp_bandwidth_mode_maximum_bandwidth(struct tb_tunnel *tunnel,937 int *max_bw_rounded)938{939 struct tb_port *in = tunnel->src_port;940 int ret, rate, lanes, max_bw;941 u32 cap;942 943 /*944 * DP IN adapter DP_LOCAL_CAP gets updated to the lowest AUX945 * read parameter values so this so we can use this to determine946 * the maximum possible bandwidth over this link.947 *948 * See USB4 v2 spec 1.0 10.4.4.5.949 */950 ret = tb_port_read(in, &cap, TB_CFG_PORT,951 in->cap_adap + DP_LOCAL_CAP, 1);952 if (ret)953 return ret;954 955 rate = tb_dp_cap_get_rate_ext(cap);956 lanes = tb_dp_cap_get_lanes(cap);957 958 max_bw = tb_dp_bandwidth(rate, lanes);959 960 if (max_bw_rounded) {961 ret = usb4_dp_port_granularity(in);962 if (ret < 0)963 return ret;964 *max_bw_rounded = roundup(max_bw, ret);965 }966 967 return max_bw;968}969 970static int tb_dp_bandwidth_mode_consumed_bandwidth(struct tb_tunnel *tunnel,971 int *consumed_up,972 int *consumed_down)973{974 struct tb_port *in = tunnel->src_port;975 int ret, allocated_bw, max_bw_rounded;976 977 if (!usb4_dp_port_bandwidth_mode_enabled(in))978 return -EOPNOTSUPP;979 980 if (!tunnel->bw_mode)981 return -EOPNOTSUPP;982 983 /* Read what was allocated previously if any */984 ret = usb4_dp_port_allocated_bandwidth(in);985 if (ret < 0)986 return ret;987 allocated_bw = ret;988 989 ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);990 if (ret < 0)991 return ret;992 if (allocated_bw == max_bw_rounded)993 allocated_bw = ret;994 995 if (tb_tunnel_direction_downstream(tunnel)) {996 *consumed_up = 0;997 *consumed_down = allocated_bw;998 } else {999 *consumed_up = allocated_bw;1000 *consumed_down = 0;1001 }1002 1003 return 0;1004}1005 1006static int tb_dp_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,1007 int *allocated_down)1008{1009 struct tb_port *in = tunnel->src_port;1010 1011 /*1012 * If we have already set the allocated bandwidth then use that.1013 * Otherwise we read it from the DPRX.1014 */1015 if (usb4_dp_port_bandwidth_mode_enabled(in) && tunnel->bw_mode) {1016 int ret, allocated_bw, max_bw_rounded;1017 1018 ret = usb4_dp_port_allocated_bandwidth(in);1019 if (ret < 0)1020 return ret;1021 allocated_bw = ret;1022 1023 ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel,1024 &max_bw_rounded);1025 if (ret < 0)1026 return ret;1027 if (allocated_bw == max_bw_rounded)1028 allocated_bw = ret;1029 1030 if (tb_tunnel_direction_downstream(tunnel)) {1031 *allocated_up = 0;1032 *allocated_down = allocated_bw;1033 } else {1034 *allocated_up = allocated_bw;1035 *allocated_down = 0;1036 }1037 return 0;1038 }1039 1040 return tunnel->consumed_bandwidth(tunnel, allocated_up,1041 allocated_down);1042}1043 1044static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,1045 int *alloc_down)1046{1047 struct tb_port *in = tunnel->src_port;1048 int max_bw_rounded, ret, tmp;1049 1050 if (!usb4_dp_port_bandwidth_mode_enabled(in))1051 return -EOPNOTSUPP;1052 1053 ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);1054 if (ret < 0)1055 return ret;1056 1057 if (tb_tunnel_direction_downstream(tunnel)) {1058 tmp = min(*alloc_down, max_bw_rounded);1059 ret = usb4_dp_port_allocate_bandwidth(in, tmp);1060 if (ret)1061 return ret;1062 *alloc_down = tmp;1063 *alloc_up = 0;1064 } else {1065 tmp = min(*alloc_up, max_bw_rounded);1066 ret = usb4_dp_port_allocate_bandwidth(in, tmp);1067 if (ret)1068 return ret;1069 *alloc_down = 0;1070 *alloc_up = tmp;1071 }1072 1073 /* Now we can use BW mode registers to figure out the bandwidth */1074 /* TODO: need to handle discovery too */1075 tunnel->bw_mode = true;1076 return 0;1077}1078 1079static int tb_dp_wait_dprx(struct tb_tunnel *tunnel, int timeout_msec)1080{1081 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);1082 struct tb_port *in = tunnel->src_port;1083 1084 /*1085 * Wait for DPRX done. Normally it should be already set for1086 * active tunnel.1087 */1088 do {1089 u32 val;1090 int ret;1091 1092 ret = tb_port_read(in, &val, TB_CFG_PORT,1093 in->cap_adap + DP_COMMON_CAP, 1);1094 if (ret)1095 return ret;1096 1097 if (val & DP_COMMON_CAP_DPRX_DONE) {1098 tb_tunnel_dbg(tunnel, "DPRX read done\n");1099 return 0;1100 }1101 usleep_range(100, 150);1102 } while (ktime_before(ktime_get(), timeout));1103 1104 tb_tunnel_dbg(tunnel, "DPRX read timeout\n");1105 return -ETIMEDOUT;1106}1107 1108/* Read cap from tunnel DP IN */1109static int tb_dp_read_cap(struct tb_tunnel *tunnel, unsigned int cap, u32 *rate,1110 u32 *lanes)1111{1112 struct tb_port *in = tunnel->src_port;1113 u32 val;1114 int ret;1115 1116 switch (cap) {1117 case DP_LOCAL_CAP:1118 case DP_REMOTE_CAP:1119 case DP_COMMON_CAP:1120 break;1121 1122 default:1123 tb_tunnel_WARN(tunnel, "invalid capability index %#x\n", cap);1124 return -EINVAL;1125 }1126 1127 /*1128 * Read from the copied remote cap so that we take into account1129 * if capabilities were reduced during exchange.1130 */1131 ret = tb_port_read(in, &val, TB_CFG_PORT, in->cap_adap + cap, 1);1132 if (ret)1133 return ret;1134 1135 *rate = tb_dp_cap_get_rate(val);1136 *lanes = tb_dp_cap_get_lanes(val);1137 return 0;1138}1139 1140static int tb_dp_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,1141 int *max_down)1142{1143 int ret;1144 1145 if (!usb4_dp_port_bandwidth_mode_enabled(tunnel->src_port))1146 return -EOPNOTSUPP;1147 1148 ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, NULL);1149 if (ret < 0)1150 return ret;1151 1152 if (tb_tunnel_direction_downstream(tunnel)) {1153 *max_up = 0;1154 *max_down = ret;1155 } else {1156 *max_up = ret;1157 *max_down = 0;1158 }1159 1160 return 0;1161}1162 1163static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,1164 int *consumed_down)1165{1166 const struct tb_switch *sw = tunnel->src_port->sw;1167 u32 rate = 0, lanes = 0;1168 int ret;1169 1170 if (tb_dp_is_usb4(sw)) {1171 /*1172 * On USB4 routers check if the bandwidth allocation1173 * mode is enabled first and then read the bandwidth1174 * through those registers.1175 */1176 ret = tb_dp_bandwidth_mode_consumed_bandwidth(tunnel, consumed_up,1177 consumed_down);1178 if (ret < 0) {1179 if (ret != -EOPNOTSUPP)1180 return ret;1181 } else if (!ret) {1182 return 0;1183 }1184 /*1185 * Then see if the DPRX negotiation is ready and if yes1186 * return that bandwidth (it may be smaller than the1187 * reduced one). According to VESA spec, the DPRX1188 * negotiation shall compete in 5 seconds after tunnel1189 * established. We give it 100ms extra just in case.1190 */1191 ret = tb_dp_wait_dprx(tunnel, 5100);1192 if (ret)1193 return ret;1194 ret = tb_dp_read_cap(tunnel, DP_COMMON_CAP, &rate, &lanes);1195 if (ret)1196 return ret;1197 } else if (sw->generation >= 2) {1198 ret = tb_dp_read_cap(tunnel, DP_REMOTE_CAP, &rate, &lanes);1199 if (ret)1200 return ret;1201 } else {1202 /* No bandwidth management for legacy devices */1203 *consumed_up = 0;1204 *consumed_down = 0;1205 return 0;1206 }1207 1208 if (tb_tunnel_direction_downstream(tunnel)) {1209 *consumed_up = 0;1210 *consumed_down = tb_dp_bandwidth(rate, lanes);1211 } else {1212 *consumed_up = tb_dp_bandwidth(rate, lanes);1213 *consumed_down = 0;1214 }1215 1216 return 0;1217}1218 1219static void tb_dp_init_aux_credits(struct tb_path_hop *hop)1220{1221 struct tb_port *port = hop->in_port;1222 struct tb_switch *sw = port->sw;1223 1224 if (tb_port_use_credit_allocation(port))1225 hop->initial_credits = sw->min_dp_aux_credits;1226 else1227 hop->initial_credits = 1;1228}1229 1230static void tb_dp_init_aux_path(struct tb_path *path, bool pm_support)1231{1232 struct tb_path_hop *hop;1233 1234 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;1235 path->egress_shared_buffer = TB_PATH_NONE;1236 path->ingress_fc_enable = TB_PATH_ALL;1237 path->ingress_shared_buffer = TB_PATH_NONE;1238 path->priority = TB_DP_AUX_PRIORITY;1239 path->weight = TB_DP_AUX_WEIGHT;1240 1241 tb_path_for_each_hop(path, hop) {1242 tb_dp_init_aux_credits(hop);1243 if (pm_support)1244 tb_init_pm_support(hop);1245 }1246}1247 1248static int tb_dp_init_video_credits(struct tb_path_hop *hop)1249{1250 struct tb_port *port = hop->in_port;1251 struct tb_switch *sw = port->sw;1252 1253 if (tb_port_use_credit_allocation(port)) {1254 unsigned int nfc_credits;1255 size_t max_dp_streams;1256 1257 tb_available_credits(port, &max_dp_streams);1258 /*1259 * Read the number of currently allocated NFC credits1260 * from the lane adapter. Since we only use them for DP1261 * tunneling we can use that to figure out how many DP1262 * tunnels already go through the lane adapter.1263 */1264 nfc_credits = port->config.nfc_credits &1265 ADP_CS_4_NFC_BUFFERS_MASK;1266 if (nfc_credits / sw->min_dp_main_credits > max_dp_streams)1267 return -ENOSPC;1268 1269 hop->nfc_credits = sw->min_dp_main_credits;1270 } else {1271 hop->nfc_credits = min(port->total_credits - 2, 12U);1272 }1273 1274 return 0;1275}1276 1277static int tb_dp_init_video_path(struct tb_path *path, bool pm_support)1278{1279 struct tb_path_hop *hop;1280 1281 path->egress_fc_enable = TB_PATH_NONE;1282 path->egress_shared_buffer = TB_PATH_NONE;1283 path->ingress_fc_enable = TB_PATH_NONE;1284 path->ingress_shared_buffer = TB_PATH_NONE;1285 path->priority = TB_DP_VIDEO_PRIORITY;1286 path->weight = TB_DP_VIDEO_WEIGHT;1287 1288 tb_path_for_each_hop(path, hop) {1289 int ret;1290 1291 ret = tb_dp_init_video_credits(hop);1292 if (ret)1293 return ret;1294 if (pm_support)1295 tb_init_pm_support(hop);1296 }1297 1298 return 0;1299}1300 1301static void tb_dp_dump(struct tb_tunnel *tunnel)1302{1303 struct tb_port *in, *out;1304 u32 dp_cap, rate, lanes;1305 1306 in = tunnel->src_port;1307 out = tunnel->dst_port;1308 1309 if (tb_port_read(in, &dp_cap, TB_CFG_PORT,1310 in->cap_adap + DP_LOCAL_CAP, 1))1311 return;1312 1313 rate = tb_dp_cap_get_rate(dp_cap);1314 lanes = tb_dp_cap_get_lanes(dp_cap);1315 1316 tb_tunnel_dbg(tunnel,1317 "DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",1318 rate, lanes, tb_dp_bandwidth(rate, lanes));1319 1320 if (tb_port_read(out, &dp_cap, TB_CFG_PORT,1321 out->cap_adap + DP_LOCAL_CAP, 1))1322 return;1323 1324 rate = tb_dp_cap_get_rate(dp_cap);1325 lanes = tb_dp_cap_get_lanes(dp_cap);1326 1327 tb_tunnel_dbg(tunnel,1328 "DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",1329 rate, lanes, tb_dp_bandwidth(rate, lanes));1330 1331 if (tb_port_read(in, &dp_cap, TB_CFG_PORT,1332 in->cap_adap + DP_REMOTE_CAP, 1))1333 return;1334 1335 rate = tb_dp_cap_get_rate(dp_cap);1336 lanes = tb_dp_cap_get_lanes(dp_cap);1337 1338 tb_tunnel_dbg(tunnel, "reduced bandwidth %u Mb/s x%u = %u Mb/s\n",1339 rate, lanes, tb_dp_bandwidth(rate, lanes));1340}1341 1342/**1343 * tb_tunnel_discover_dp() - Discover existing Display Port tunnels1344 * @tb: Pointer to the domain structure1345 * @in: DP in adapter1346 * @alloc_hopid: Allocate HopIDs from visited ports1347 *1348 * If @in adapter is active, follows the tunnel to the DP out adapter1349 * and back. Returns the discovered tunnel or %NULL if there was no1350 * tunnel.1351 *1352 * Return: DP tunnel or %NULL if no tunnel found.1353 */1354struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in,1355 bool alloc_hopid)1356{1357 struct tb_tunnel *tunnel;1358 struct tb_port *port;1359 struct tb_path *path;1360 1361 if (!tb_dp_port_is_enabled(in))1362 return NULL;1363 1364 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);1365 if (!tunnel)1366 return NULL;1367 1368 tunnel->init = tb_dp_init;1369 tunnel->deinit = tb_dp_deinit;1370 tunnel->activate = tb_dp_activate;1371 tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;1372 tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;1373 tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;1374 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;1375 tunnel->src_port = in;1376 1377 path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,1378 &tunnel->dst_port, "Video", alloc_hopid);1379 if (!path) {1380 /* Just disable the DP IN port */1381 tb_dp_port_enable(in, false);1382 goto err_free;1383 }1384 tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path;1385 if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], false))1386 goto err_free;1387 1388 path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX",1389 alloc_hopid);1390 if (!path)1391 goto err_deactivate;1392 tunnel->paths[TB_DP_AUX_PATH_OUT] = path;1393 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT], false);1394 1395 path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,1396 &port, "AUX RX", alloc_hopid);1397 if (!path)1398 goto err_deactivate;1399 tunnel->paths[TB_DP_AUX_PATH_IN] = path;1400 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN], false);1401 1402 /* Validate that the tunnel is complete */1403 if (!tb_port_is_dpout(tunnel->dst_port)) {1404 tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n");1405 goto err_deactivate;1406 }1407 1408 if (!tb_dp_port_is_enabled(tunnel->dst_port))1409 goto err_deactivate;1410 1411 if (!tb_dp_port_hpd_is_active(tunnel->dst_port))1412 goto err_deactivate;1413 1414 if (port != tunnel->src_port) {1415 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");1416 goto err_deactivate;1417 }1418 1419 tb_dp_dump(tunnel);1420 1421 tb_tunnel_dbg(tunnel, "discovered\n");1422 return tunnel;1423 1424err_deactivate:1425 tb_tunnel_deactivate(tunnel);1426err_free:1427 tb_tunnel_free(tunnel);1428 1429 return NULL;1430}1431 1432/**1433 * tb_tunnel_alloc_dp() - allocate a Display Port tunnel1434 * @tb: Pointer to the domain structure1435 * @in: DP in adapter port1436 * @out: DP out adapter port1437 * @link_nr: Preferred lane adapter when the link is not bonded1438 * @max_up: Maximum available upstream bandwidth for the DP tunnel.1439 * %0 if no available bandwidth.1440 * @max_down: Maximum available downstream bandwidth for the DP tunnel.1441 * %0 if no available bandwidth.1442 *1443 * Allocates a tunnel between @in and @out that is capable of tunneling1444 * Display Port traffic.1445 *1446 * Return: Returns a tb_tunnel on success or NULL on failure.1447 */1448struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,1449 struct tb_port *out, int link_nr,1450 int max_up, int max_down)1451{1452 struct tb_tunnel *tunnel;1453 struct tb_path **paths;1454 struct tb_path *path;1455 bool pm_support;1456 1457 if (WARN_ON(!in->cap_adap || !out->cap_adap))1458 return NULL;1459 1460 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);1461 if (!tunnel)1462 return NULL;1463 1464 tunnel->init = tb_dp_init;1465 tunnel->deinit = tb_dp_deinit;1466 tunnel->activate = tb_dp_activate;1467 tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;1468 tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;1469 tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;1470 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;1471 tunnel->src_port = in;1472 tunnel->dst_port = out;1473 tunnel->max_up = max_up;1474 tunnel->max_down = max_down;1475 1476 paths = tunnel->paths;1477 pm_support = usb4_switch_version(in->sw) >= 2;1478 1479 path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,1480 link_nr, "Video");1481 if (!path)1482 goto err_free;1483 tb_dp_init_video_path(path, pm_support);1484 paths[TB_DP_VIDEO_PATH_OUT] = path;1485 1486 path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,1487 TB_DP_AUX_TX_HOPID, link_nr, "AUX TX");1488 if (!path)1489 goto err_free;1490 tb_dp_init_aux_path(path, pm_support);1491 paths[TB_DP_AUX_PATH_OUT] = path;1492 1493 path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,1494 TB_DP_AUX_RX_HOPID, link_nr, "AUX RX");1495 if (!path)1496 goto err_free;1497 tb_dp_init_aux_path(path, pm_support);1498 paths[TB_DP_AUX_PATH_IN] = path;1499 1500 return tunnel;1501 1502err_free:1503 tb_tunnel_free(tunnel);1504 return NULL;1505}1506 1507static unsigned int tb_dma_available_credits(const struct tb_port *port)1508{1509 const struct tb_switch *sw = port->sw;1510 int credits;1511 1512 credits = tb_available_credits(port, NULL);1513 if (tb_acpi_may_tunnel_pcie())1514 credits -= sw->max_pcie_credits;1515 credits -= port->dma_credits;1516 1517 return credits > 0 ? credits : 0;1518}1519 1520static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits)1521{1522 struct tb_port *port = hop->in_port;1523 1524 if (tb_port_use_credit_allocation(port)) {1525 unsigned int available = tb_dma_available_credits(port);1526 1527 /*1528 * Need to have at least TB_MIN_DMA_CREDITS, otherwise1529 * DMA path cannot be established.1530 */1531 if (available < TB_MIN_DMA_CREDITS)1532 return -ENOSPC;1533 1534 while (credits > available)1535 credits--;1536 1537 tb_port_dbg(port, "reserving %u credits for DMA path\n",1538 credits);1539 1540 port->dma_credits += credits;1541 } else {1542 if (tb_port_is_null(port))1543 credits = port->bonded ? 14 : 6;1544 else1545 credits = min(port->total_credits, credits);1546 }1547 1548 hop->initial_credits = credits;1549 return 0;1550}1551 1552/* Path from lane adapter to NHI */1553static int tb_dma_init_rx_path(struct tb_path *path, unsigned int credits)1554{1555 struct tb_path_hop *hop;1556 unsigned int i, tmp;1557 1558 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;1559 path->ingress_fc_enable = TB_PATH_ALL;1560 path->egress_shared_buffer = TB_PATH_NONE;1561 path->ingress_shared_buffer = TB_PATH_NONE;1562 path->priority = TB_DMA_PRIORITY;1563 path->weight = TB_DMA_WEIGHT;1564 path->clear_fc = true;1565 1566 /*1567 * First lane adapter is the one connected to the remote host.1568 * We don't tunnel other traffic over this link so can use all1569 * the credits (except the ones reserved for control traffic).1570 */1571 hop = &path->hops[0];1572 tmp = min(tb_usable_credits(hop->in_port), credits);1573 hop->initial_credits = tmp;1574 hop->in_port->dma_credits += tmp;1575 1576 for (i = 1; i < path->path_length; i++) {1577 int ret;1578 1579 ret = tb_dma_reserve_credits(&path->hops[i], credits);1580 if (ret)1581 return ret;1582 }1583 1584 return 0;1585}1586 1587/* Path from NHI to lane adapter */1588static int tb_dma_init_tx_path(struct tb_path *path, unsigned int credits)1589{1590 struct tb_path_hop *hop;1591 1592 path->egress_fc_enable = TB_PATH_ALL;1593 path->ingress_fc_enable = TB_PATH_ALL;1594 path->egress_shared_buffer = TB_PATH_NONE;1595 path->ingress_shared_buffer = TB_PATH_NONE;1596 path->priority = TB_DMA_PRIORITY;1597 path->weight = TB_DMA_WEIGHT;1598 path->clear_fc = true;1599 1600 tb_path_for_each_hop(path, hop) {1601 int ret;1602 1603 ret = tb_dma_reserve_credits(hop, credits);1604 if (ret)1605 return ret;1606 }1607 1608 return 0;1609}1610 1611static void tb_dma_release_credits(struct tb_path_hop *hop)1612{1613 struct tb_port *port = hop->in_port;1614 1615 if (tb_port_use_credit_allocation(port)) {1616 port->dma_credits -= hop->initial_credits;1617 1618 tb_port_dbg(port, "released %u DMA path credits\n",1619 hop->initial_credits);1620 }1621}1622 1623static void tb_dma_deinit_path(struct tb_path *path)1624{1625 struct tb_path_hop *hop;1626 1627 tb_path_for_each_hop(path, hop)1628 tb_dma_release_credits(hop);1629}1630 1631static void tb_dma_deinit(struct tb_tunnel *tunnel)1632{1633 int i;1634 1635 for (i = 0; i < tunnel->npaths; i++) {1636 if (!tunnel->paths[i])1637 continue;1638 tb_dma_deinit_path(tunnel->paths[i]);1639 }1640}1641 1642/**1643 * tb_tunnel_alloc_dma() - allocate a DMA tunnel1644 * @tb: Pointer to the domain structure1645 * @nhi: Host controller port1646 * @dst: Destination null port which the other domain is connected to1647 * @transmit_path: HopID used for transmitting packets1648 * @transmit_ring: NHI ring number used to send packets towards the1649 * other domain. Set to %-1 if TX path is not needed.1650 * @receive_path: HopID used for receiving packets1651 * @receive_ring: NHI ring number used to receive packets from the1652 * other domain. Set to %-1 if RX path is not needed.1653 *1654 * Return: Returns a tb_tunnel on success or NULL on failure.1655 */1656struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,1657 struct tb_port *dst, int transmit_path,1658 int transmit_ring, int receive_path,1659 int receive_ring)1660{1661 struct tb_tunnel *tunnel;1662 size_t npaths = 0, i = 0;1663 struct tb_path *path;1664 int credits;1665 1666 /* Ring 0 is reserved for control channel */1667 if (WARN_ON(!receive_ring || !transmit_ring))1668 return NULL;1669 1670 if (receive_ring > 0)1671 npaths++;1672 if (transmit_ring > 0)1673 npaths++;1674 1675 if (WARN_ON(!npaths))1676 return NULL;1677 1678 tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA);1679 if (!tunnel)1680 return NULL;1681 1682 tunnel->src_port = nhi;1683 tunnel->dst_port = dst;1684 tunnel->deinit = tb_dma_deinit;1685 1686 credits = min_not_zero(dma_credits, nhi->sw->max_dma_credits);1687 1688 if (receive_ring > 0) {1689 path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0,1690 "DMA RX");1691 if (!path)1692 goto err_free;1693 tunnel->paths[i++] = path;1694 if (tb_dma_init_rx_path(path, credits)) {1695 tb_tunnel_dbg(tunnel, "not enough buffers for RX path\n");1696 goto err_free;1697 }1698 }1699 1700 if (transmit_ring > 0) {1701 path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0,1702 "DMA TX");1703 if (!path)1704 goto err_free;1705 tunnel->paths[i++] = path;1706 if (tb_dma_init_tx_path(path, credits)) {1707 tb_tunnel_dbg(tunnel, "not enough buffers for TX path\n");1708 goto err_free;1709 }1710 }1711 1712 return tunnel;1713 1714err_free:1715 tb_tunnel_free(tunnel);1716 return NULL;1717}1718 1719/**1720 * tb_tunnel_match_dma() - Match DMA tunnel1721 * @tunnel: Tunnel to match1722 * @transmit_path: HopID used for transmitting packets. Pass %-1 to ignore.1723 * @transmit_ring: NHI ring number used to send packets towards the1724 * other domain. Pass %-1 to ignore.1725 * @receive_path: HopID used for receiving packets. Pass %-1 to ignore.1726 * @receive_ring: NHI ring number used to receive packets from the1727 * other domain. Pass %-1 to ignore.1728 *1729 * This function can be used to match specific DMA tunnel, if there are1730 * multiple DMA tunnels going through the same XDomain connection.1731 * Returns true if there is match and false otherwise.1732 */1733bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,1734 int transmit_ring, int receive_path, int receive_ring)1735{1736 const struct tb_path *tx_path = NULL, *rx_path = NULL;1737 int i;1738 1739 if (!receive_ring || !transmit_ring)1740 return false;1741 1742 for (i = 0; i < tunnel->npaths; i++) {1743 const struct tb_path *path = tunnel->paths[i];1744 1745 if (!path)1746 continue;1747 1748 if (tb_port_is_nhi(path->hops[0].in_port))1749 tx_path = path;1750 else if (tb_port_is_nhi(path->hops[path->path_length - 1].out_port))1751 rx_path = path;1752 }1753 1754 if (transmit_ring > 0 || transmit_path > 0) {1755 if (!tx_path)1756 return false;1757 if (transmit_ring > 0 &&1758 (tx_path->hops[0].in_hop_index != transmit_ring))1759 return false;1760 if (transmit_path > 0 &&1761 (tx_path->hops[tx_path->path_length - 1].next_hop_index != transmit_path))1762 return false;1763 }1764 1765 if (receive_ring > 0 || receive_path > 0) {1766 if (!rx_path)1767 return false;1768 if (receive_path > 0 &&1769 (rx_path->hops[0].in_hop_index != receive_path))1770 return false;1771 if (receive_ring > 0 &&1772 (rx_path->hops[rx_path->path_length - 1].next_hop_index != receive_ring))1773 return false;1774 }1775 1776 return true;1777}1778 1779static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down)1780{1781 int ret, up_max_rate, down_max_rate;1782 1783 ret = usb4_usb3_port_max_link_rate(up);1784 if (ret < 0)1785 return ret;1786 up_max_rate = ret;1787 1788 ret = usb4_usb3_port_max_link_rate(down);1789 if (ret < 0)1790 return ret;1791 down_max_rate = ret;1792 1793 return min(up_max_rate, down_max_rate);1794}1795 1796static int tb_usb3_init(struct tb_tunnel *tunnel)1797{1798 tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n",1799 tunnel->allocated_up, tunnel->allocated_down);1800 1801 return usb4_usb3_port_allocate_bandwidth(tunnel->src_port,1802 &tunnel->allocated_up,1803 &tunnel->allocated_down);1804}1805 1806static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate)1807{1808 int res;1809 1810 res = tb_usb3_port_enable(tunnel->src_port, activate);1811 if (res)1812 return res;1813 1814 if (tb_port_is_usb3_up(tunnel->dst_port))1815 return tb_usb3_port_enable(tunnel->dst_port, activate);1816 1817 return 0;1818}1819 1820static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel,1821 int *consumed_up, int *consumed_down)1822{1823 struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);1824 int pcie_weight = tb_acpi_may_tunnel_pcie() ? TB_PCI_WEIGHT : 0;1825 1826 /*1827 * PCIe tunneling, if enabled, affects the USB3 bandwidth so1828 * take that it into account here.1829 */1830 *consumed_up = tunnel->allocated_up *1831 (TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;1832 *consumed_down = tunnel->allocated_down *1833 (TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;1834 1835 if (tb_port_get_link_generation(port) >= 4) {1836 *consumed_up = max(*consumed_up, USB4_V2_USB3_MIN_BANDWIDTH);1837 *consumed_down = max(*consumed_down, USB4_V2_USB3_MIN_BANDWIDTH);1838 }1839 1840 return 0;1841}1842 1843static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel)1844{1845 int ret;1846 1847 ret = usb4_usb3_port_release_bandwidth(tunnel->src_port,1848 &tunnel->allocated_up,1849 &tunnel->allocated_down);1850 if (ret)1851 return ret;1852 1853 tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n",1854 tunnel->allocated_up, tunnel->allocated_down);1855 return 0;1856}1857 1858static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,1859 int *available_up,1860 int *available_down)1861{1862 int ret, max_rate, allocate_up, allocate_down;1863 1864 ret = tb_usb3_max_link_rate(tunnel->dst_port, tunnel->src_port);1865 if (ret < 0) {1866 tb_tunnel_warn(tunnel, "failed to read maximum link rate\n");1867 return;1868 }1869 1870 /*1871 * 90% of the max rate can be allocated for isochronous1872 * transfers.1873 */1874 max_rate = ret * 90 / 100;1875 1876 /* No need to reclaim if already at maximum */1877 if (tunnel->allocated_up >= max_rate &&1878 tunnel->allocated_down >= max_rate)1879 return;1880 1881 /* Don't go lower than what is already allocated */1882 allocate_up = min(max_rate, *available_up);1883 if (allocate_up < tunnel->allocated_up)1884 allocate_up = tunnel->allocated_up;1885 1886 allocate_down = min(max_rate, *available_down);1887 if (allocate_down < tunnel->allocated_down)1888 allocate_down = tunnel->allocated_down;1889 1890 /* If no changes no need to do more */1891 if (allocate_up == tunnel->allocated_up &&1892 allocate_down == tunnel->allocated_down)1893 return;1894 1895 ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up,1896 &allocate_down);1897 if (ret) {1898 tb_tunnel_info(tunnel, "failed to allocate bandwidth\n");1899 return;1900 }1901 1902 tunnel->allocated_up = allocate_up;1903 *available_up -= tunnel->allocated_up;1904 1905 tunnel->allocated_down = allocate_down;1906 *available_down -= tunnel->allocated_down;1907 1908 tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n",1909 tunnel->allocated_up, tunnel->allocated_down);1910}1911 1912static void tb_usb3_init_credits(struct tb_path_hop *hop)1913{1914 struct tb_port *port = hop->in_port;1915 struct tb_switch *sw = port->sw;1916 unsigned int credits;1917 1918 if (tb_port_use_credit_allocation(port)) {1919 credits = sw->max_usb3_credits;1920 } else {1921 if (tb_port_is_null(port))1922 credits = port->bonded ? 32 : 16;1923 else1924 credits = 7;1925 }1926 1927 hop->initial_credits = credits;1928}1929 1930static void tb_usb3_init_path(struct tb_path *path)1931{1932 struct tb_path_hop *hop;1933 1934 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;1935 path->egress_shared_buffer = TB_PATH_NONE;1936 path->ingress_fc_enable = TB_PATH_ALL;1937 path->ingress_shared_buffer = TB_PATH_NONE;1938 path->priority = TB_USB3_PRIORITY;1939 path->weight = TB_USB3_WEIGHT;1940 path->drop_packages = 0;1941 1942 tb_path_for_each_hop(path, hop)1943 tb_usb3_init_credits(hop);1944}1945 1946/**1947 * tb_tunnel_discover_usb3() - Discover existing USB3 tunnels1948 * @tb: Pointer to the domain structure1949 * @down: USB3 downstream adapter1950 * @alloc_hopid: Allocate HopIDs from visited ports1951 *1952 * If @down adapter is active, follows the tunnel to the USB3 upstream1953 * adapter and back. Returns the discovered tunnel or %NULL if there was1954 * no tunnel.1955 */1956struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down,1957 bool alloc_hopid)1958{1959 struct tb_tunnel *tunnel;1960 struct tb_path *path;1961 1962 if (!tb_usb3_port_is_enabled(down))1963 return NULL;1964 1965 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);1966 if (!tunnel)1967 return NULL;1968 1969 tunnel->activate = tb_usb3_activate;1970 tunnel->src_port = down;1971 1972 /*1973 * Discover both paths even if they are not complete. We will1974 * clean them up by calling tb_tunnel_deactivate() below in that1975 * case.1976 */1977 path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,1978 &tunnel->dst_port, "USB3 Down", alloc_hopid);1979 if (!path) {1980 /* Just disable the downstream port */1981 tb_usb3_port_enable(down, false);1982 goto err_free;1983 }1984 tunnel->paths[TB_USB3_PATH_DOWN] = path;1985 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]);1986 1987 path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL,1988 "USB3 Up", alloc_hopid);1989 if (!path)1990 goto err_deactivate;1991 tunnel->paths[TB_USB3_PATH_UP] = path;1992 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]);1993 1994 /* Validate that the tunnel is complete */1995 if (!tb_port_is_usb3_up(tunnel->dst_port)) {1996 tb_port_warn(tunnel->dst_port,1997 "path does not end on an USB3 adapter, cleaning up\n");1998 goto err_deactivate;1999 }2000 2001 if (down != tunnel->src_port) {2002 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");2003 goto err_deactivate;2004 }2005 2006 if (!tb_usb3_port_is_enabled(tunnel->dst_port)) {2007 tb_tunnel_warn(tunnel,2008 "tunnel is not fully activated, cleaning up\n");2009 goto err_deactivate;2010 }2011 2012 if (!tb_route(down->sw)) {2013 int ret;2014 2015 /*2016 * Read the initial bandwidth allocation for the first2017 * hop tunnel.2018 */2019 ret = usb4_usb3_port_allocated_bandwidth(down,2020 &tunnel->allocated_up, &tunnel->allocated_down);2021 if (ret)2022 goto err_deactivate;2023 2024 tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n",2025 tunnel->allocated_up, tunnel->allocated_down);2026 2027 tunnel->init = tb_usb3_init;2028 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;2029 tunnel->release_unused_bandwidth =2030 tb_usb3_release_unused_bandwidth;2031 tunnel->reclaim_available_bandwidth =2032 tb_usb3_reclaim_available_bandwidth;2033 }2034 2035 tb_tunnel_dbg(tunnel, "discovered\n");2036 return tunnel;2037 2038err_deactivate:2039 tb_tunnel_deactivate(tunnel);2040err_free:2041 tb_tunnel_free(tunnel);2042 2043 return NULL;2044}2045 2046/**2047 * tb_tunnel_alloc_usb3() - allocate a USB3 tunnel2048 * @tb: Pointer to the domain structure2049 * @up: USB3 upstream adapter port2050 * @down: USB3 downstream adapter port2051 * @max_up: Maximum available upstream bandwidth for the USB3 tunnel.2052 * %0 if no available bandwidth.2053 * @max_down: Maximum available downstream bandwidth for the USB3 tunnel.2054 * %0 if no available bandwidth.2055 *2056 * Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and2057 * @TB_TYPE_USB3_DOWN.2058 *2059 * Return: Returns a tb_tunnel on success or %NULL on failure.2060 */2061struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,2062 struct tb_port *down, int max_up,2063 int max_down)2064{2065 struct tb_tunnel *tunnel;2066 struct tb_path *path;2067 int max_rate = 0;2068 2069 if (!tb_route(down->sw) && (max_up > 0 || max_down > 0)) {2070 /*2071 * For USB3 isochronous transfers, we allow bandwidth which is2072 * not higher than 90% of maximum supported bandwidth by USB32073 * adapters.2074 */2075 max_rate = tb_usb3_max_link_rate(down, up);2076 if (max_rate < 0)2077 return NULL;2078 2079 max_rate = max_rate * 90 / 100;2080 tb_port_dbg(up, "maximum required bandwidth for USB3 tunnel %d Mb/s\n",2081 max_rate);2082 }2083 2084 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);2085 if (!tunnel)2086 return NULL;2087 2088 tunnel->activate = tb_usb3_activate;2089 tunnel->src_port = down;2090 tunnel->dst_port = up;2091 tunnel->max_up = max_up;2092 tunnel->max_down = max_down;2093 2094 path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0,2095 "USB3 Down");2096 if (!path) {2097 tb_tunnel_free(tunnel);2098 return NULL;2099 }2100 tb_usb3_init_path(path);2101 tunnel->paths[TB_USB3_PATH_DOWN] = path;2102 2103 path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0,2104 "USB3 Up");2105 if (!path) {2106 tb_tunnel_free(tunnel);2107 return NULL;2108 }2109 tb_usb3_init_path(path);2110 tunnel->paths[TB_USB3_PATH_UP] = path;2111 2112 if (!tb_route(down->sw)) {2113 tunnel->allocated_up = min(max_rate, max_up);2114 tunnel->allocated_down = min(max_rate, max_down);2115 2116 tunnel->init = tb_usb3_init;2117 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;2118 tunnel->release_unused_bandwidth =2119 tb_usb3_release_unused_bandwidth;2120 tunnel->reclaim_available_bandwidth =2121 tb_usb3_reclaim_available_bandwidth;2122 }2123 2124 return tunnel;2125}2126 2127/**2128 * tb_tunnel_free() - free a tunnel2129 * @tunnel: Tunnel to be freed2130 *2131 * Frees a tunnel. The tunnel does not need to be deactivated.2132 */2133void tb_tunnel_free(struct tb_tunnel *tunnel)2134{2135 int i;2136 2137 if (!tunnel)2138 return;2139 2140 if (tunnel->deinit)2141 tunnel->deinit(tunnel);2142 2143 for (i = 0; i < tunnel->npaths; i++) {2144 if (tunnel->paths[i])2145 tb_path_free(tunnel->paths[i]);2146 }2147 2148 kfree(tunnel->paths);2149 kfree(tunnel);2150}2151 2152/**2153 * tb_tunnel_is_invalid - check whether an activated path is still valid2154 * @tunnel: Tunnel to check2155 */2156bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel)2157{2158 int i;2159 2160 for (i = 0; i < tunnel->npaths; i++) {2161 WARN_ON(!tunnel->paths[i]->activated);2162 if (tb_path_is_invalid(tunnel->paths[i]))2163 return true;2164 }2165 2166 return false;2167}2168 2169/**2170 * tb_tunnel_restart() - activate a tunnel after a hardware reset2171 * @tunnel: Tunnel to restart2172 *2173 * Return: 0 on success and negative errno in case if failure2174 */2175int tb_tunnel_restart(struct tb_tunnel *tunnel)2176{2177 int res, i;2178 2179 tb_tunnel_dbg(tunnel, "activating\n");2180 2181 /*2182 * Make sure all paths are properly disabled before enabling2183 * them again.2184 */2185 for (i = 0; i < tunnel->npaths; i++) {2186 if (tunnel->paths[i]->activated) {2187 tb_path_deactivate(tunnel->paths[i]);2188 tunnel->paths[i]->activated = false;2189 }2190 }2191 2192 if (tunnel->init) {2193 res = tunnel->init(tunnel);2194 if (res)2195 return res;2196 }2197 2198 for (i = 0; i < tunnel->npaths; i++) {2199 res = tb_path_activate(tunnel->paths[i]);2200 if (res)2201 goto err;2202 }2203 2204 if (tunnel->activate) {2205 res = tunnel->activate(tunnel, true);2206 if (res)2207 goto err;2208 }2209 2210 return 0;2211 2212err:2213 tb_tunnel_warn(tunnel, "activation failed\n");2214 tb_tunnel_deactivate(tunnel);2215 return res;2216}2217 2218/**2219 * tb_tunnel_activate() - activate a tunnel2220 * @tunnel: Tunnel to activate2221 *2222 * Return: Returns 0 on success or an error code on failure.2223 */2224int tb_tunnel_activate(struct tb_tunnel *tunnel)2225{2226 int i;2227 2228 for (i = 0; i < tunnel->npaths; i++) {2229 if (tunnel->paths[i]->activated) {2230 tb_tunnel_WARN(tunnel,2231 "trying to activate an already activated tunnel\n");2232 return -EINVAL;2233 }2234 }2235 2236 return tb_tunnel_restart(tunnel);2237}2238 2239/**2240 * tb_tunnel_deactivate() - deactivate a tunnel2241 * @tunnel: Tunnel to deactivate2242 */2243void tb_tunnel_deactivate(struct tb_tunnel *tunnel)2244{2245 int i;2246 2247 tb_tunnel_dbg(tunnel, "deactivating\n");2248 2249 if (tunnel->activate)2250 tunnel->activate(tunnel, false);2251 2252 for (i = 0; i < tunnel->npaths; i++) {2253 if (tunnel->paths[i] && tunnel->paths[i]->activated)2254 tb_path_deactivate(tunnel->paths[i]);2255 }2256}2257 2258/**2259 * tb_tunnel_port_on_path() - Does the tunnel go through port2260 * @tunnel: Tunnel to check2261 * @port: Port to check2262 *2263 * Returns true if @tunnel goes through @port (direction does not matter),2264 * false otherwise.2265 */2266bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,2267 const struct tb_port *port)2268{2269 int i;2270 2271 for (i = 0; i < tunnel->npaths; i++) {2272 if (!tunnel->paths[i])2273 continue;2274 2275 if (tb_path_port_on_path(tunnel->paths[i], port))2276 return true;2277 }2278 2279 return false;2280}2281 2282static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel)2283{2284 int i;2285 2286 for (i = 0; i < tunnel->npaths; i++) {2287 if (!tunnel->paths[i])2288 return false;2289 if (!tunnel->paths[i]->activated)2290 return false;2291 }2292 2293 return true;2294}2295 2296/**2297 * tb_tunnel_maximum_bandwidth() - Return maximum possible bandwidth2298 * @tunnel: Tunnel to check2299 * @max_up: Maximum upstream bandwidth in Mb/s2300 * @max_down: Maximum downstream bandwidth in Mb/s2301 *2302 * Returns maximum possible bandwidth this tunnel can go if not limited2303 * by other bandwidth clients. If the tunnel does not support this2304 * returns %-EOPNOTSUPP.2305 */2306int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,2307 int *max_down)2308{2309 if (!tb_tunnel_is_active(tunnel))2310 return -EINVAL;2311 2312 if (tunnel->maximum_bandwidth)2313 return tunnel->maximum_bandwidth(tunnel, max_up, max_down);2314 return -EOPNOTSUPP;2315}2316 2317/**2318 * tb_tunnel_allocated_bandwidth() - Return bandwidth allocated for the tunnel2319 * @tunnel: Tunnel to check2320 * @allocated_up: Currently allocated upstream bandwidth in Mb/s is stored here2321 * @allocated_down: Currently allocated downstream bandwidth in Mb/s is2322 * stored here2323 *2324 * Returns the bandwidth allocated for the tunnel. This may be higher2325 * than what the tunnel actually consumes.2326 */2327int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,2328 int *allocated_down)2329{2330 if (!tb_tunnel_is_active(tunnel))2331 return -EINVAL;2332 2333 if (tunnel->allocated_bandwidth)2334 return tunnel->allocated_bandwidth(tunnel, allocated_up,2335 allocated_down);2336 return -EOPNOTSUPP;2337}2338 2339/**2340 * tb_tunnel_alloc_bandwidth() - Change tunnel bandwidth allocation2341 * @tunnel: Tunnel whose bandwidth allocation to change2342 * @alloc_up: New upstream bandwidth in Mb/s2343 * @alloc_down: New downstream bandwidth in Mb/s2344 *2345 * Tries to change tunnel bandwidth allocation. If succeeds returns %02346 * and updates @alloc_up and @alloc_down to that was actually allocated2347 * (it may not be the same as passed originally). Returns negative errno2348 * in case of failure.2349 */2350int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,2351 int *alloc_down)2352{2353 if (!tb_tunnel_is_active(tunnel))2354 return -EINVAL;2355 2356 if (tunnel->alloc_bandwidth)2357 return tunnel->alloc_bandwidth(tunnel, alloc_up, alloc_down);2358 2359 return -EOPNOTSUPP;2360}2361 2362/**2363 * tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel2364 * @tunnel: Tunnel to check2365 * @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port.2366 * Can be %NULL.2367 * @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port.2368 * Can be %NULL.2369 *2370 * Stores the amount of isochronous bandwidth @tunnel consumes in2371 * @consumed_up and @consumed_down. In case of success returns %0,2372 * negative errno otherwise.2373 */2374int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,2375 int *consumed_down)2376{2377 int up_bw = 0, down_bw = 0;2378 2379 if (!tb_tunnel_is_active(tunnel))2380 goto out;2381 2382 if (tunnel->consumed_bandwidth) {2383 int ret;2384 2385 ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw);2386 if (ret)2387 return ret;2388 2389 tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw,2390 down_bw);2391 }2392 2393out:2394 if (consumed_up)2395 *consumed_up = up_bw;2396 if (consumed_down)2397 *consumed_down = down_bw;2398 2399 return 0;2400}2401 2402/**2403 * tb_tunnel_release_unused_bandwidth() - Release unused bandwidth2404 * @tunnel: Tunnel whose unused bandwidth to release2405 *2406 * If tunnel supports dynamic bandwidth management (USB3 tunnels at the2407 * moment) this function makes it to release all the unused bandwidth.2408 *2409 * Returns %0 in case of success and negative errno otherwise.2410 */2411int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel)2412{2413 if (!tb_tunnel_is_active(tunnel))2414 return 0;2415 2416 if (tunnel->release_unused_bandwidth) {2417 int ret;2418 2419 ret = tunnel->release_unused_bandwidth(tunnel);2420 if (ret)2421 return ret;2422 }2423 2424 return 0;2425}2426 2427/**2428 * tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth2429 * @tunnel: Tunnel reclaiming available bandwidth2430 * @available_up: Available upstream bandwidth (in Mb/s)2431 * @available_down: Available downstream bandwidth (in Mb/s)2432 *2433 * Reclaims bandwidth from @available_up and @available_down and updates2434 * the variables accordingly (e.g decreases both according to what was2435 * reclaimed by the tunnel). If nothing was reclaimed the values are2436 * kept as is.2437 */2438void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,2439 int *available_up,2440 int *available_down)2441{2442 if (!tb_tunnel_is_active(tunnel))2443 return;2444 2445 if (tunnel->reclaim_available_bandwidth)2446 tunnel->reclaim_available_bandwidth(tunnel, available_up,2447 available_down);2448}2449 2450const char *tb_tunnel_type_name(const struct tb_tunnel *tunnel)2451{2452 return tb_tunnel_names[tunnel->type];2453}2454