1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2d6cc51cdSAndreas Noever /* 399cabbb0SMika Westerberg * Thunderbolt driver - bus logic (NHI independent) 4d6cc51cdSAndreas Noever * 5d6cc51cdSAndreas Noever * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> 699cabbb0SMika Westerberg * Copyright (C) 2019, Intel Corporation 7d6cc51cdSAndreas Noever */ 8d6cc51cdSAndreas Noever 9d6cc51cdSAndreas Noever #include <linux/slab.h> 10d6cc51cdSAndreas Noever #include <linux/errno.h> 11d6cc51cdSAndreas Noever #include <linux/delay.h> 126ac6faeeSMika Westerberg #include <linux/pm_runtime.h> 13349bfe08SMika Westerberg #include <linux/platform_data/x86/apple.h> 14d6cc51cdSAndreas Noever 15d6cc51cdSAndreas Noever #include "tb.h" 167adf6097SAndreas Noever #include "tb_regs.h" 171752b9f7SMika Westerberg #include "tunnel.h" 18d6cc51cdSAndreas Noever 197f0a34d7SMika Westerberg #define TB_TIMEOUT 100 /* ms */ 206ce35635SMika Westerberg #define MAX_GROUPS 7 /* max Group_ID is 7 */ 217f0a34d7SMika Westerberg 229d3cce0bSMika Westerberg /** 239d3cce0bSMika Westerberg * struct tb_cm - Simple Thunderbolt connection manager 249d3cce0bSMika Westerberg * @tunnel_list: List of active tunnels 258afe909bSMika Westerberg * @dp_resources: List of available DP resources for DP tunneling 269d3cce0bSMika Westerberg * @hotplug_active: tb_handle_hotplug will stop progressing plug 279d3cce0bSMika Westerberg * events and exit if this is not set (it needs to 289d3cce0bSMika Westerberg * acquire the lock one more time). Used to drain wq 299d3cce0bSMika Westerberg * after cfg has been paused. 306ac6faeeSMika Westerberg * @remove_work: Work used to remove any unplugged routers after 316ac6faeeSMika Westerberg * runtime resume 326ce35635SMika Westerberg * @groups: Bandwidth groups used in this domain. 339d3cce0bSMika Westerberg */ 349d3cce0bSMika Westerberg struct tb_cm { 359d3cce0bSMika Westerberg struct list_head tunnel_list; 368afe909bSMika Westerberg struct list_head dp_resources; 379d3cce0bSMika Westerberg bool hotplug_active; 386ac6faeeSMika Westerberg struct delayed_work remove_work; 396ce35635SMika Westerberg struct tb_bandwidth_group groups[MAX_GROUPS]; 409d3cce0bSMika Westerberg }; 419da672a4SAndreas Noever 426ac6faeeSMika Westerberg static inline struct tb *tcm_to_tb(struct tb_cm *tcm) 436ac6faeeSMika Westerberg { 446ac6faeeSMika Westerberg return ((void *)tcm - sizeof(struct tb)); 456ac6faeeSMika Westerberg } 466ac6faeeSMika Westerberg 474f807e47SMika Westerberg struct tb_hotplug_event { 484f807e47SMika Westerberg struct work_struct work; 494f807e47SMika Westerberg struct tb *tb; 504f807e47SMika Westerberg u64 route; 514f807e47SMika Westerberg u8 port; 524f807e47SMika Westerberg bool unplug; 534f807e47SMika Westerberg }; 544f807e47SMika Westerberg 556ce35635SMika Westerberg static void tb_init_bandwidth_groups(struct tb_cm *tcm) 566ce35635SMika Westerberg { 576ce35635SMika Westerberg int i; 586ce35635SMika Westerberg 596ce35635SMika Westerberg for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { 606ce35635SMika Westerberg struct tb_bandwidth_group *group = &tcm->groups[i]; 616ce35635SMika Westerberg 626ce35635SMika Westerberg group->tb = tcm_to_tb(tcm); 636ce35635SMika Westerberg group->index = i + 1; 646ce35635SMika Westerberg INIT_LIST_HEAD(&group->ports); 656ce35635SMika Westerberg } 666ce35635SMika Westerberg } 676ce35635SMika Westerberg 686ce35635SMika Westerberg static void tb_bandwidth_group_attach_port(struct tb_bandwidth_group *group, 696ce35635SMika Westerberg struct tb_port *in) 706ce35635SMika Westerberg { 716ce35635SMika Westerberg if (!group || WARN_ON(in->group)) 726ce35635SMika Westerberg return; 736ce35635SMika Westerberg 746ce35635SMika Westerberg in->group = group; 756ce35635SMika Westerberg list_add_tail(&in->group_list, &group->ports); 766ce35635SMika Westerberg 776ce35635SMika Westerberg tb_port_dbg(in, "attached to bandwidth group %d\n", group->index); 786ce35635SMika Westerberg } 796ce35635SMika Westerberg 806ce35635SMika Westerberg static struct tb_bandwidth_group *tb_find_free_bandwidth_group(struct tb_cm *tcm) 816ce35635SMika Westerberg { 826ce35635SMika Westerberg int i; 836ce35635SMika Westerberg 846ce35635SMika Westerberg for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { 856ce35635SMika Westerberg struct tb_bandwidth_group *group = &tcm->groups[i]; 866ce35635SMika Westerberg 876ce35635SMika Westerberg if (list_empty(&group->ports)) 886ce35635SMika Westerberg return group; 896ce35635SMika Westerberg } 906ce35635SMika Westerberg 916ce35635SMika Westerberg return NULL; 926ce35635SMika Westerberg } 936ce35635SMika Westerberg 946ce35635SMika Westerberg static struct tb_bandwidth_group * 956ce35635SMika Westerberg tb_attach_bandwidth_group(struct tb_cm *tcm, struct tb_port *in, 966ce35635SMika Westerberg struct tb_port *out) 976ce35635SMika Westerberg { 986ce35635SMika Westerberg struct tb_bandwidth_group *group; 996ce35635SMika Westerberg struct tb_tunnel *tunnel; 1006ce35635SMika Westerberg 1016ce35635SMika Westerberg /* 1026ce35635SMika Westerberg * Find all DP tunnels that go through all the same USB4 links 1036ce35635SMika Westerberg * as this one. Because we always setup tunnels the same way we 1046ce35635SMika Westerberg * can just check for the routers at both ends of the tunnels 1056ce35635SMika Westerberg * and if they are the same we have a match. 1066ce35635SMika Westerberg */ 1076ce35635SMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 1086ce35635SMika Westerberg if (!tb_tunnel_is_dp(tunnel)) 1096ce35635SMika Westerberg continue; 1106ce35635SMika Westerberg 1116ce35635SMika Westerberg if (tunnel->src_port->sw == in->sw && 1126ce35635SMika Westerberg tunnel->dst_port->sw == out->sw) { 1136ce35635SMika Westerberg group = tunnel->src_port->group; 1146ce35635SMika Westerberg if (group) { 1156ce35635SMika Westerberg tb_bandwidth_group_attach_port(group, in); 1166ce35635SMika Westerberg return group; 1176ce35635SMika Westerberg } 1186ce35635SMika Westerberg } 1196ce35635SMika Westerberg } 1206ce35635SMika Westerberg 1216ce35635SMika Westerberg /* Pick up next available group then */ 1226ce35635SMika Westerberg group = tb_find_free_bandwidth_group(tcm); 1236ce35635SMika Westerberg if (group) 1246ce35635SMika Westerberg tb_bandwidth_group_attach_port(group, in); 1256ce35635SMika Westerberg else 1266ce35635SMika Westerberg tb_port_warn(in, "no available bandwidth groups\n"); 1276ce35635SMika Westerberg 1286ce35635SMika Westerberg return group; 1296ce35635SMika Westerberg } 1306ce35635SMika Westerberg 1316ce35635SMika Westerberg static void tb_discover_bandwidth_group(struct tb_cm *tcm, struct tb_port *in, 1326ce35635SMika Westerberg struct tb_port *out) 1336ce35635SMika Westerberg { 1348d73f6b8SMika Westerberg if (usb4_dp_port_bandwidth_mode_enabled(in)) { 1356ce35635SMika Westerberg int index, i; 1366ce35635SMika Westerberg 1376ce35635SMika Westerberg index = usb4_dp_port_group_id(in); 1386ce35635SMika Westerberg for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { 1396ce35635SMika Westerberg if (tcm->groups[i].index == index) { 1406ce35635SMika Westerberg tb_bandwidth_group_attach_port(&tcm->groups[i], in); 1416ce35635SMika Westerberg return; 1426ce35635SMika Westerberg } 1436ce35635SMika Westerberg } 1446ce35635SMika Westerberg } 1456ce35635SMika Westerberg 1466ce35635SMika Westerberg tb_attach_bandwidth_group(tcm, in, out); 1476ce35635SMika Westerberg } 1486ce35635SMika Westerberg 1496ce35635SMika Westerberg static void tb_detach_bandwidth_group(struct tb_port *in) 1506ce35635SMika Westerberg { 1516ce35635SMika Westerberg struct tb_bandwidth_group *group = in->group; 1526ce35635SMika Westerberg 1536ce35635SMika Westerberg if (group) { 1546ce35635SMika Westerberg in->group = NULL; 1556ce35635SMika Westerberg list_del_init(&in->group_list); 1566ce35635SMika Westerberg 1576ce35635SMika Westerberg tb_port_dbg(in, "detached from bandwidth group %d\n", group->index); 1586ce35635SMika Westerberg } 1596ce35635SMika Westerberg } 1606ce35635SMika Westerberg 1614f807e47SMika Westerberg static void tb_handle_hotplug(struct work_struct *work); 1624f807e47SMika Westerberg 1634f807e47SMika Westerberg static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) 1644f807e47SMika Westerberg { 1654f807e47SMika Westerberg struct tb_hotplug_event *ev; 1664f807e47SMika Westerberg 1674f807e47SMika Westerberg ev = kmalloc(sizeof(*ev), GFP_KERNEL); 1684f807e47SMika Westerberg if (!ev) 1694f807e47SMika Westerberg return; 1704f807e47SMika Westerberg 1714f807e47SMika Westerberg ev->tb = tb; 1724f807e47SMika Westerberg ev->route = route; 1734f807e47SMika Westerberg ev->port = port; 1744f807e47SMika Westerberg ev->unplug = unplug; 1754f807e47SMika Westerberg INIT_WORK(&ev->work, tb_handle_hotplug); 1764f807e47SMika Westerberg queue_work(tb->wq, &ev->work); 1774f807e47SMika Westerberg } 1784f807e47SMika Westerberg 1799da672a4SAndreas Noever /* enumeration & hot plug handling */ 1809da672a4SAndreas Noever 1818afe909bSMika Westerberg static void tb_add_dp_resources(struct tb_switch *sw) 1828afe909bSMika Westerberg { 1838afe909bSMika Westerberg struct tb_cm *tcm = tb_priv(sw->tb); 1848afe909bSMika Westerberg struct tb_port *port; 1858afe909bSMika Westerberg 1868afe909bSMika Westerberg tb_switch_for_each_port(sw, port) { 1878afe909bSMika Westerberg if (!tb_port_is_dpin(port)) 1888afe909bSMika Westerberg continue; 1898afe909bSMika Westerberg 1908afe909bSMika Westerberg if (!tb_switch_query_dp_resource(sw, port)) 1918afe909bSMika Westerberg continue; 1928afe909bSMika Westerberg 1938afe909bSMika Westerberg list_add_tail(&port->list, &tcm->dp_resources); 1948afe909bSMika Westerberg tb_port_dbg(port, "DP IN resource available\n"); 1958afe909bSMika Westerberg } 1968afe909bSMika Westerberg } 1978afe909bSMika Westerberg 1988afe909bSMika Westerberg static void tb_remove_dp_resources(struct tb_switch *sw) 1998afe909bSMika Westerberg { 2008afe909bSMika Westerberg struct tb_cm *tcm = tb_priv(sw->tb); 2018afe909bSMika Westerberg struct tb_port *port, *tmp; 2028afe909bSMika Westerberg 2038afe909bSMika Westerberg /* Clear children resources first */ 2048afe909bSMika Westerberg tb_switch_for_each_port(sw, port) { 2058afe909bSMika Westerberg if (tb_port_has_remote(port)) 2068afe909bSMika Westerberg tb_remove_dp_resources(port->remote->sw); 2078afe909bSMika Westerberg } 2088afe909bSMika Westerberg 2098afe909bSMika Westerberg list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { 2108afe909bSMika Westerberg if (port->sw == sw) { 2118afe909bSMika Westerberg tb_port_dbg(port, "DP OUT resource unavailable\n"); 2128afe909bSMika Westerberg list_del_init(&port->list); 2138afe909bSMika Westerberg } 2148afe909bSMika Westerberg } 2158afe909bSMika Westerberg } 2168afe909bSMika Westerberg 217b60e31bfSSanjay R Mehta static void tb_discover_dp_resource(struct tb *tb, struct tb_port *port) 218b60e31bfSSanjay R Mehta { 219b60e31bfSSanjay R Mehta struct tb_cm *tcm = tb_priv(tb); 220b60e31bfSSanjay R Mehta struct tb_port *p; 221b60e31bfSSanjay R Mehta 222b60e31bfSSanjay R Mehta list_for_each_entry(p, &tcm->dp_resources, list) { 223b60e31bfSSanjay R Mehta if (p == port) 224b60e31bfSSanjay R Mehta return; 225b60e31bfSSanjay R Mehta } 226b60e31bfSSanjay R Mehta 227b60e31bfSSanjay R Mehta tb_port_dbg(port, "DP %s resource available discovered\n", 228b60e31bfSSanjay R Mehta tb_port_is_dpin(port) ? "IN" : "OUT"); 229b60e31bfSSanjay R Mehta list_add_tail(&port->list, &tcm->dp_resources); 230b60e31bfSSanjay R Mehta } 231b60e31bfSSanjay R Mehta 232b60e31bfSSanjay R Mehta static void tb_discover_dp_resources(struct tb *tb) 233b60e31bfSSanjay R Mehta { 234b60e31bfSSanjay R Mehta struct tb_cm *tcm = tb_priv(tb); 235b60e31bfSSanjay R Mehta struct tb_tunnel *tunnel; 236b60e31bfSSanjay R Mehta 237b60e31bfSSanjay R Mehta list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 238b60e31bfSSanjay R Mehta if (tb_tunnel_is_dp(tunnel)) 239b60e31bfSSanjay R Mehta tb_discover_dp_resource(tb, tunnel->dst_port); 240b60e31bfSSanjay R Mehta } 241b60e31bfSSanjay R Mehta } 242b60e31bfSSanjay R Mehta 24353ba2e16SMika Westerberg /* Enables CL states up to host router */ 2441a9b6cb8SMika Westerberg static int tb_enable_clx(struct tb_switch *sw) 2451a9b6cb8SMika Westerberg { 24653ba2e16SMika Westerberg struct tb_cm *tcm = tb_priv(sw->tb); 247fd4d58d1SMika Westerberg unsigned int clx = TB_CL0S | TB_CL1; 24853ba2e16SMika Westerberg const struct tb_tunnel *tunnel; 2491a9b6cb8SMika Westerberg int ret; 2501a9b6cb8SMika Westerberg 2511a9b6cb8SMika Westerberg /* 2529650de73SMika Westerberg * Currently only enable CLx for the first link. This is enough 2539650de73SMika Westerberg * to allow the CPU to save energy at least on Intel hardware 2549650de73SMika Westerberg * and makes it slightly simpler to implement. We may change 2559650de73SMika Westerberg * this in the future to cover the whole topology if it turns 2569650de73SMika Westerberg * out to be beneficial. 2579650de73SMika Westerberg */ 25853ba2e16SMika Westerberg while (sw && sw->config.depth > 1) 25953ba2e16SMika Westerberg sw = tb_switch_parent(sw); 26053ba2e16SMika Westerberg 26153ba2e16SMika Westerberg if (!sw) 26253ba2e16SMika Westerberg return 0; 26353ba2e16SMika Westerberg 2649650de73SMika Westerberg if (sw->config.depth != 1) 2659650de73SMika Westerberg return 0; 2669650de73SMika Westerberg 2679650de73SMika Westerberg /* 26853ba2e16SMika Westerberg * If we are re-enabling then check if there is an active DMA 26953ba2e16SMika Westerberg * tunnel and in that case bail out. 27053ba2e16SMika Westerberg */ 27153ba2e16SMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 27253ba2e16SMika Westerberg if (tb_tunnel_is_dma(tunnel)) { 27353ba2e16SMika Westerberg if (tb_tunnel_port_on_path(tunnel, tb_upstream_port(sw))) 27453ba2e16SMika Westerberg return 0; 27553ba2e16SMika Westerberg } 27653ba2e16SMika Westerberg } 27753ba2e16SMika Westerberg 27853ba2e16SMika Westerberg /* 279fd4d58d1SMika Westerberg * Initially try with CL2. If that's not supported by the 280fd4d58d1SMika Westerberg * topology try with CL0s and CL1 and then give up. 2811a9b6cb8SMika Westerberg */ 282fd4d58d1SMika Westerberg ret = tb_switch_clx_enable(sw, clx | TB_CL2); 283fd4d58d1SMika Westerberg if (ret == -EOPNOTSUPP) 284fd4d58d1SMika Westerberg ret = tb_switch_clx_enable(sw, clx); 2851a9b6cb8SMika Westerberg return ret == -EOPNOTSUPP ? 0 : ret; 2861a9b6cb8SMika Westerberg } 2871a9b6cb8SMika Westerberg 28853ba2e16SMika Westerberg /* Disables CL states up to the host router */ 28953ba2e16SMika Westerberg static void tb_disable_clx(struct tb_switch *sw) 29053ba2e16SMika Westerberg { 29153ba2e16SMika Westerberg do { 29253ba2e16SMika Westerberg if (tb_switch_clx_disable(sw) < 0) 29353ba2e16SMika Westerberg tb_sw_warn(sw, "failed to disable CL states\n"); 29453ba2e16SMika Westerberg sw = tb_switch_parent(sw); 29553ba2e16SMika Westerberg } while (sw); 29653ba2e16SMika Westerberg } 29753ba2e16SMika Westerberg 2987d283f41SMika Westerberg static int tb_increase_switch_tmu_accuracy(struct device *dev, void *data) 2997d283f41SMika Westerberg { 3007d283f41SMika Westerberg struct tb_switch *sw; 3017d283f41SMika Westerberg 3027d283f41SMika Westerberg sw = tb_to_switch(dev); 303d49b4f04SMika Westerberg if (!sw) 304d49b4f04SMika Westerberg return 0; 305d49b4f04SMika Westerberg 306d49b4f04SMika Westerberg if (tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_LOWRES)) { 307d49b4f04SMika Westerberg enum tb_switch_tmu_mode mode; 308d49b4f04SMika Westerberg int ret; 309d49b4f04SMika Westerberg 310d49b4f04SMika Westerberg if (tb_switch_clx_is_enabled(sw, TB_CL1)) 311d49b4f04SMika Westerberg mode = TB_SWITCH_TMU_MODE_HIFI_UNI; 312d49b4f04SMika Westerberg else 313d49b4f04SMika Westerberg mode = TB_SWITCH_TMU_MODE_HIFI_BI; 314d49b4f04SMika Westerberg 315d49b4f04SMika Westerberg ret = tb_switch_tmu_configure(sw, mode); 316d49b4f04SMika Westerberg if (ret) 317d49b4f04SMika Westerberg return ret; 318d49b4f04SMika Westerberg 319d49b4f04SMika Westerberg return tb_switch_tmu_enable(sw); 3207d283f41SMika Westerberg } 3217d283f41SMika Westerberg 3227d283f41SMika Westerberg return 0; 3237d283f41SMika Westerberg } 3247d283f41SMika Westerberg 3257d283f41SMika Westerberg static void tb_increase_tmu_accuracy(struct tb_tunnel *tunnel) 3267d283f41SMika Westerberg { 3277d283f41SMika Westerberg struct tb_switch *sw; 3287d283f41SMika Westerberg 3297d283f41SMika Westerberg if (!tunnel) 3307d283f41SMika Westerberg return; 3317d283f41SMika Westerberg 3327d283f41SMika Westerberg /* 3337d283f41SMika Westerberg * Once first DP tunnel is established we change the TMU 3347d283f41SMika Westerberg * accuracy of first depth child routers (and the host router) 3357d283f41SMika Westerberg * to the highest. This is needed for the DP tunneling to work 3367d283f41SMika Westerberg * but also allows CL0s. 337d49b4f04SMika Westerberg * 338d49b4f04SMika Westerberg * If both routers are v2 then we don't need to do anything as 339d49b4f04SMika Westerberg * they are using enhanced TMU mode that allows all CLx. 3407d283f41SMika Westerberg */ 3417d283f41SMika Westerberg sw = tunnel->tb->root_switch; 3427d283f41SMika Westerberg device_for_each_child(&sw->dev, NULL, tb_increase_switch_tmu_accuracy); 3437d283f41SMika Westerberg } 3447d283f41SMika Westerberg 3454e7b4955SMika Westerberg static int tb_enable_tmu(struct tb_switch *sw) 3464e7b4955SMika Westerberg { 3474e7b4955SMika Westerberg int ret; 3484e7b4955SMika Westerberg 3494e7b4955SMika Westerberg /* 350d49b4f04SMika Westerberg * If both routers at the end of the link are v2 we simply 351d49b4f04SMika Westerberg * enable the enhanched uni-directional mode. That covers all 352d49b4f04SMika Westerberg * the CL states. For v1 and before we need to use the normal 353d49b4f04SMika Westerberg * rate to allow CL1 (when supported). Otherwise we keep the TMU 354d49b4f04SMika Westerberg * running at the highest accuracy. 3554e7b4955SMika Westerberg */ 356d49b4f04SMika Westerberg ret = tb_switch_tmu_configure(sw, 357d49b4f04SMika Westerberg TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI); 358d49b4f04SMika Westerberg if (ret == -EOPNOTSUPP) { 35912a14f2fSMika Westerberg if (tb_switch_clx_is_enabled(sw, TB_CL1)) 360d49b4f04SMika Westerberg ret = tb_switch_tmu_configure(sw, 361d49b4f04SMika Westerberg TB_SWITCH_TMU_MODE_LOWRES); 3624e7b4955SMika Westerberg else 363d49b4f04SMika Westerberg ret = tb_switch_tmu_configure(sw, 364d49b4f04SMika Westerberg TB_SWITCH_TMU_MODE_HIFI_BI); 365d49b4f04SMika Westerberg } 366ef34add8SMika Westerberg if (ret) 367ef34add8SMika Westerberg return ret; 3684e7b4955SMika Westerberg 3694e7b4955SMika Westerberg /* If it is already enabled in correct mode, don't touch it */ 3704e7b4955SMika Westerberg if (tb_switch_tmu_is_enabled(sw)) 3714e7b4955SMika Westerberg return 0; 3724e7b4955SMika Westerberg 3734e7b4955SMika Westerberg ret = tb_switch_tmu_disable(sw); 3744e7b4955SMika Westerberg if (ret) 3754e7b4955SMika Westerberg return ret; 3764e7b4955SMika Westerberg 3774e7b4955SMika Westerberg ret = tb_switch_tmu_post_time(sw); 3784e7b4955SMika Westerberg if (ret) 3794e7b4955SMika Westerberg return ret; 3804e7b4955SMika Westerberg 3814e7b4955SMika Westerberg return tb_switch_tmu_enable(sw); 3824e7b4955SMika Westerberg } 3834e7b4955SMika Westerberg 38443bddb26SMika Westerberg static void tb_switch_discover_tunnels(struct tb_switch *sw, 38543bddb26SMika Westerberg struct list_head *list, 38643bddb26SMika Westerberg bool alloc_hopids) 3870414bec5SMika Westerberg { 3880414bec5SMika Westerberg struct tb *tb = sw->tb; 3890414bec5SMika Westerberg struct tb_port *port; 3900414bec5SMika Westerberg 391b433d010SMika Westerberg tb_switch_for_each_port(sw, port) { 3920414bec5SMika Westerberg struct tb_tunnel *tunnel = NULL; 3930414bec5SMika Westerberg 3940414bec5SMika Westerberg switch (port->config.type) { 3954f807e47SMika Westerberg case TB_TYPE_DP_HDMI_IN: 39643bddb26SMika Westerberg tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids); 3977d283f41SMika Westerberg tb_increase_tmu_accuracy(tunnel); 3984f807e47SMika Westerberg break; 3994f807e47SMika Westerberg 4000414bec5SMika Westerberg case TB_TYPE_PCIE_DOWN: 40143bddb26SMika Westerberg tunnel = tb_tunnel_discover_pci(tb, port, alloc_hopids); 4020414bec5SMika Westerberg break; 4030414bec5SMika Westerberg 404e6f81858SRajmohan Mani case TB_TYPE_USB3_DOWN: 40543bddb26SMika Westerberg tunnel = tb_tunnel_discover_usb3(tb, port, alloc_hopids); 406e6f81858SRajmohan Mani break; 407e6f81858SRajmohan Mani 4080414bec5SMika Westerberg default: 4090414bec5SMika Westerberg break; 4100414bec5SMika Westerberg } 4110414bec5SMika Westerberg 41243bddb26SMika Westerberg if (tunnel) 41343bddb26SMika Westerberg list_add_tail(&tunnel->list, list); 41443bddb26SMika Westerberg } 4154f807e47SMika Westerberg 41643bddb26SMika Westerberg tb_switch_for_each_port(sw, port) { 41743bddb26SMika Westerberg if (tb_port_has_remote(port)) { 41843bddb26SMika Westerberg tb_switch_discover_tunnels(port->remote->sw, list, 41943bddb26SMika Westerberg alloc_hopids); 42043bddb26SMika Westerberg } 42143bddb26SMika Westerberg } 42243bddb26SMika Westerberg } 42343bddb26SMika Westerberg 42443bddb26SMika Westerberg static void tb_discover_tunnels(struct tb *tb) 42543bddb26SMika Westerberg { 42643bddb26SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 42743bddb26SMika Westerberg struct tb_tunnel *tunnel; 42843bddb26SMika Westerberg 42943bddb26SMika Westerberg tb_switch_discover_tunnels(tb->root_switch, &tcm->tunnel_list, true); 43043bddb26SMika Westerberg 43143bddb26SMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 4324f807e47SMika Westerberg if (tb_tunnel_is_pci(tunnel)) { 4330414bec5SMika Westerberg struct tb_switch *parent = tunnel->dst_port->sw; 4340414bec5SMika Westerberg 4350414bec5SMika Westerberg while (parent != tunnel->src_port->sw) { 4360414bec5SMika Westerberg parent->boot = true; 4370414bec5SMika Westerberg parent = tb_switch_parent(parent); 4380414bec5SMika Westerberg } 439c94732bdSMika Westerberg } else if (tb_tunnel_is_dp(tunnel)) { 4406ce35635SMika Westerberg struct tb_port *in = tunnel->src_port; 4416ce35635SMika Westerberg struct tb_port *out = tunnel->dst_port; 4426ce35635SMika Westerberg 443c94732bdSMika Westerberg /* Keep the domain from powering down */ 4446ce35635SMika Westerberg pm_runtime_get_sync(&in->sw->dev); 4456ce35635SMika Westerberg pm_runtime_get_sync(&out->sw->dev); 4466ce35635SMika Westerberg 4476ce35635SMika Westerberg tb_discover_bandwidth_group(tcm, in, out); 4484f807e47SMika Westerberg } 4490414bec5SMika Westerberg } 4500414bec5SMika Westerberg } 4519da672a4SAndreas Noever 452f9cad07bSMika Westerberg static int tb_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd) 453284652a4SMika Westerberg { 454284652a4SMika Westerberg if (tb_switch_is_usb4(port->sw)) 455f9cad07bSMika Westerberg return usb4_port_configure_xdomain(port, xd); 456284652a4SMika Westerberg return tb_lc_configure_xdomain(port); 457284652a4SMika Westerberg } 458284652a4SMika Westerberg 459284652a4SMika Westerberg static void tb_port_unconfigure_xdomain(struct tb_port *port) 460284652a4SMika Westerberg { 461284652a4SMika Westerberg if (tb_switch_is_usb4(port->sw)) 462284652a4SMika Westerberg usb4_port_unconfigure_xdomain(port); 463284652a4SMika Westerberg else 464284652a4SMika Westerberg tb_lc_unconfigure_xdomain(port); 465341d4518SMika Westerberg 466341d4518SMika Westerberg tb_port_enable(port->dual_link_port); 467284652a4SMika Westerberg } 468284652a4SMika Westerberg 4697ea4cd6bSMika Westerberg static void tb_scan_xdomain(struct tb_port *port) 4707ea4cd6bSMika Westerberg { 4717ea4cd6bSMika Westerberg struct tb_switch *sw = port->sw; 4727ea4cd6bSMika Westerberg struct tb *tb = sw->tb; 4737ea4cd6bSMika Westerberg struct tb_xdomain *xd; 4747ea4cd6bSMika Westerberg u64 route; 4757ea4cd6bSMika Westerberg 4765ca67688SMika Westerberg if (!tb_is_xdomain_enabled()) 4775ca67688SMika Westerberg return; 4785ca67688SMika Westerberg 4797ea4cd6bSMika Westerberg route = tb_downstream_route(port); 4807ea4cd6bSMika Westerberg xd = tb_xdomain_find_by_route(tb, route); 4817ea4cd6bSMika Westerberg if (xd) { 4827ea4cd6bSMika Westerberg tb_xdomain_put(xd); 4837ea4cd6bSMika Westerberg return; 4847ea4cd6bSMika Westerberg } 4857ea4cd6bSMika Westerberg 4867ea4cd6bSMika Westerberg xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid, 4877ea4cd6bSMika Westerberg NULL); 4887ea4cd6bSMika Westerberg if (xd) { 4897ea4cd6bSMika Westerberg tb_port_at(route, sw)->xdomain = xd; 490f9cad07bSMika Westerberg tb_port_configure_xdomain(port, xd); 4917ea4cd6bSMika Westerberg tb_xdomain_add(xd); 4927ea4cd6bSMika Westerberg } 4937ea4cd6bSMika Westerberg } 4947ea4cd6bSMika Westerberg 495e6f81858SRajmohan Mani /** 496e6f81858SRajmohan Mani * tb_find_unused_port() - return the first inactive port on @sw 497e6f81858SRajmohan Mani * @sw: Switch to find the port on 498e6f81858SRajmohan Mani * @type: Port type to look for 499e6f81858SRajmohan Mani */ 500e6f81858SRajmohan Mani static struct tb_port *tb_find_unused_port(struct tb_switch *sw, 501e6f81858SRajmohan Mani enum tb_port_type type) 502e6f81858SRajmohan Mani { 503e6f81858SRajmohan Mani struct tb_port *port; 504e6f81858SRajmohan Mani 505e6f81858SRajmohan Mani tb_switch_for_each_port(sw, port) { 506e6f81858SRajmohan Mani if (tb_is_upstream_port(port)) 507e6f81858SRajmohan Mani continue; 508e6f81858SRajmohan Mani if (port->config.type != type) 509e6f81858SRajmohan Mani continue; 510e6f81858SRajmohan Mani if (!port->cap_adap) 511e6f81858SRajmohan Mani continue; 512e6f81858SRajmohan Mani if (tb_port_is_enabled(port)) 513e6f81858SRajmohan Mani continue; 514e6f81858SRajmohan Mani return port; 515e6f81858SRajmohan Mani } 516e6f81858SRajmohan Mani return NULL; 517e6f81858SRajmohan Mani } 518e6f81858SRajmohan Mani 519e6f81858SRajmohan Mani static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, 520e6f81858SRajmohan Mani const struct tb_port *port) 521e6f81858SRajmohan Mani { 522e6f81858SRajmohan Mani struct tb_port *down; 523e6f81858SRajmohan Mani 524e6f81858SRajmohan Mani down = usb4_switch_map_usb3_down(sw, port); 52577cfa40fSMika Westerberg if (down && !tb_usb3_port_is_enabled(down)) 526e6f81858SRajmohan Mani return down; 52777cfa40fSMika Westerberg return NULL; 528e6f81858SRajmohan Mani } 529e6f81858SRajmohan Mani 5300bd680cdSMika Westerberg static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, 5310bd680cdSMika Westerberg struct tb_port *src_port, 5320bd680cdSMika Westerberg struct tb_port *dst_port) 5330bd680cdSMika Westerberg { 5340bd680cdSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 5350bd680cdSMika Westerberg struct tb_tunnel *tunnel; 5360bd680cdSMika Westerberg 5370bd680cdSMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 5380bd680cdSMika Westerberg if (tunnel->type == type && 5390bd680cdSMika Westerberg ((src_port && src_port == tunnel->src_port) || 5400bd680cdSMika Westerberg (dst_port && dst_port == tunnel->dst_port))) { 5410bd680cdSMika Westerberg return tunnel; 5420bd680cdSMika Westerberg } 5430bd680cdSMika Westerberg } 5440bd680cdSMika Westerberg 5450bd680cdSMika Westerberg return NULL; 5460bd680cdSMika Westerberg } 5470bd680cdSMika Westerberg 5480bd680cdSMika Westerberg static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, 5490bd680cdSMika Westerberg struct tb_port *src_port, 5500bd680cdSMika Westerberg struct tb_port *dst_port) 5510bd680cdSMika Westerberg { 5520bd680cdSMika Westerberg struct tb_port *port, *usb3_down; 5530bd680cdSMika Westerberg struct tb_switch *sw; 5540bd680cdSMika Westerberg 5550bd680cdSMika Westerberg /* Pick the router that is deepest in the topology */ 5560bd680cdSMika Westerberg if (dst_port->sw->config.depth > src_port->sw->config.depth) 5570bd680cdSMika Westerberg sw = dst_port->sw; 5580bd680cdSMika Westerberg else 5590bd680cdSMika Westerberg sw = src_port->sw; 5600bd680cdSMika Westerberg 5610bd680cdSMika Westerberg /* Can't be the host router */ 5620bd680cdSMika Westerberg if (sw == tb->root_switch) 5630bd680cdSMika Westerberg return NULL; 5640bd680cdSMika Westerberg 5650bd680cdSMika Westerberg /* Find the downstream USB4 port that leads to this router */ 5660bd680cdSMika Westerberg port = tb_port_at(tb_route(sw), tb->root_switch); 5670bd680cdSMika Westerberg /* Find the corresponding host router USB3 downstream port */ 5680bd680cdSMika Westerberg usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); 5690bd680cdSMika Westerberg if (!usb3_down) 5700bd680cdSMika Westerberg return NULL; 5710bd680cdSMika Westerberg 5720bd680cdSMika Westerberg return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); 5730bd680cdSMika Westerberg } 5740bd680cdSMika Westerberg 5750bd680cdSMika Westerberg static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, 5760bd680cdSMika Westerberg struct tb_port *dst_port, int *available_up, int *available_down) 5770bd680cdSMika Westerberg { 5780bd680cdSMika Westerberg int usb3_consumed_up, usb3_consumed_down, ret; 5790bd680cdSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 5800bd680cdSMika Westerberg struct tb_tunnel *tunnel; 5810bd680cdSMika Westerberg struct tb_port *port; 5820bd680cdSMika Westerberg 5832426fdf7SMika Westerberg tb_dbg(tb, "calculating available bandwidth between %llx:%u <-> %llx:%u\n", 5842426fdf7SMika Westerberg tb_route(src_port->sw), src_port->port, tb_route(dst_port->sw), 5852426fdf7SMika Westerberg dst_port->port); 5860bd680cdSMika Westerberg 5870bd680cdSMika Westerberg tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 5886ce35635SMika Westerberg if (tunnel && tunnel->src_port != src_port && 5896ce35635SMika Westerberg tunnel->dst_port != dst_port) { 5900bd680cdSMika Westerberg ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, 5910bd680cdSMika Westerberg &usb3_consumed_down); 5920bd680cdSMika Westerberg if (ret) 5930bd680cdSMika Westerberg return ret; 5940bd680cdSMika Westerberg } else { 5950bd680cdSMika Westerberg usb3_consumed_up = 0; 5960bd680cdSMika Westerberg usb3_consumed_down = 0; 5970bd680cdSMika Westerberg } 5980bd680cdSMika Westerberg 599e111fb92SGil Fine /* Maximum possible bandwidth asymmetric Gen 4 link is 120 Gb/s */ 600e111fb92SGil Fine *available_up = *available_down = 120000; 6010bd680cdSMika Westerberg 6020bd680cdSMika Westerberg /* Find the minimum available bandwidth over all links */ 6030bd680cdSMika Westerberg tb_for_each_port_on_path(src_port, dst_port, port) { 6040bd680cdSMika Westerberg int link_speed, link_width, up_bw, down_bw; 6050bd680cdSMika Westerberg 6060bd680cdSMika Westerberg if (!tb_port_is_null(port)) 6070bd680cdSMika Westerberg continue; 6080bd680cdSMika Westerberg 6090bd680cdSMika Westerberg if (tb_is_upstream_port(port)) { 6100bd680cdSMika Westerberg link_speed = port->sw->link_speed; 611e111fb92SGil Fine /* 612e111fb92SGil Fine * sw->link_width is from upstream perspective 613e111fb92SGil Fine * so we use the opposite for downstream of the 614e111fb92SGil Fine * host router. 615e111fb92SGil Fine */ 616e111fb92SGil Fine if (port->sw->link_width == TB_LINK_WIDTH_ASYM_TX) { 617e111fb92SGil Fine up_bw = link_speed * 3 * 1000; 618e111fb92SGil Fine down_bw = link_speed * 1 * 1000; 619e111fb92SGil Fine } else if (port->sw->link_width == TB_LINK_WIDTH_ASYM_RX) { 620e111fb92SGil Fine up_bw = link_speed * 1 * 1000; 621e111fb92SGil Fine down_bw = link_speed * 3 * 1000; 622e111fb92SGil Fine } else { 623e111fb92SGil Fine up_bw = link_speed * port->sw->link_width * 1000; 624e111fb92SGil Fine down_bw = up_bw; 625e111fb92SGil Fine } 6260bd680cdSMika Westerberg } else { 6270bd680cdSMika Westerberg link_speed = tb_port_get_link_speed(port); 6280bd680cdSMika Westerberg if (link_speed < 0) 6290bd680cdSMika Westerberg return link_speed; 630e111fb92SGil Fine 631e111fb92SGil Fine link_width = tb_port_get_link_width(port); 632e111fb92SGil Fine if (link_width < 0) 633e111fb92SGil Fine return link_width; 634e111fb92SGil Fine 635e111fb92SGil Fine if (link_width == TB_LINK_WIDTH_ASYM_TX) { 636e111fb92SGil Fine up_bw = link_speed * 1 * 1000; 637e111fb92SGil Fine down_bw = link_speed * 3 * 1000; 638e111fb92SGil Fine } else if (link_width == TB_LINK_WIDTH_ASYM_RX) { 639e111fb92SGil Fine up_bw = link_speed * 3 * 1000; 640e111fb92SGil Fine down_bw = link_speed * 1 * 1000; 641e111fb92SGil Fine } else { 642e111fb92SGil Fine up_bw = link_speed * link_width * 1000; 643e111fb92SGil Fine down_bw = up_bw; 644e111fb92SGil Fine } 6450bd680cdSMika Westerberg } 6460bd680cdSMika Westerberg 6470bd680cdSMika Westerberg /* Leave 10% guard band */ 6480bd680cdSMika Westerberg up_bw -= up_bw / 10; 649e111fb92SGil Fine down_bw -= down_bw / 10; 6500bd680cdSMika Westerberg 6512426fdf7SMika Westerberg tb_port_dbg(port, "link total bandwidth %d/%d Mb/s\n", up_bw, 6522426fdf7SMika Westerberg down_bw); 6530bd680cdSMika Westerberg 6540bd680cdSMika Westerberg /* 6550bd680cdSMika Westerberg * Find all DP tunnels that cross the port and reduce 6560bd680cdSMika Westerberg * their consumed bandwidth from the available. 6570bd680cdSMika Westerberg */ 6580bd680cdSMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 6590bd680cdSMika Westerberg int dp_consumed_up, dp_consumed_down; 6600bd680cdSMika Westerberg 6616ce35635SMika Westerberg if (tb_tunnel_is_invalid(tunnel)) 6626ce35635SMika Westerberg continue; 6636ce35635SMika Westerberg 6640bd680cdSMika Westerberg if (!tb_tunnel_is_dp(tunnel)) 6650bd680cdSMika Westerberg continue; 6660bd680cdSMika Westerberg 6670bd680cdSMika Westerberg if (!tb_tunnel_port_on_path(tunnel, port)) 6680bd680cdSMika Westerberg continue; 6690bd680cdSMika Westerberg 6706ce35635SMika Westerberg /* 6716ce35635SMika Westerberg * Ignore the DP tunnel between src_port and 6726ce35635SMika Westerberg * dst_port because it is the same tunnel and we 6736ce35635SMika Westerberg * may be re-calculating estimated bandwidth. 6746ce35635SMika Westerberg */ 6756ce35635SMika Westerberg if (tunnel->src_port == src_port && 6766ce35635SMika Westerberg tunnel->dst_port == dst_port) 6776ce35635SMika Westerberg continue; 6786ce35635SMika Westerberg 6790bd680cdSMika Westerberg ret = tb_tunnel_consumed_bandwidth(tunnel, 6800bd680cdSMika Westerberg &dp_consumed_up, 6810bd680cdSMika Westerberg &dp_consumed_down); 6820bd680cdSMika Westerberg if (ret) 6830bd680cdSMika Westerberg return ret; 6840bd680cdSMika Westerberg 6850bd680cdSMika Westerberg up_bw -= dp_consumed_up; 6860bd680cdSMika Westerberg down_bw -= dp_consumed_down; 6870bd680cdSMika Westerberg } 6880bd680cdSMika Westerberg 6890bd680cdSMika Westerberg /* 6900bd680cdSMika Westerberg * If USB3 is tunneled from the host router down to the 6910bd680cdSMika Westerberg * branch leading to port we need to take USB3 consumed 6920bd680cdSMika Westerberg * bandwidth into account regardless whether it actually 6930bd680cdSMika Westerberg * crosses the port. 6940bd680cdSMika Westerberg */ 6950bd680cdSMika Westerberg up_bw -= usb3_consumed_up; 6960bd680cdSMika Westerberg down_bw -= usb3_consumed_down; 6970bd680cdSMika Westerberg 6980bd680cdSMika Westerberg if (up_bw < *available_up) 6990bd680cdSMika Westerberg *available_up = up_bw; 7000bd680cdSMika Westerberg if (down_bw < *available_down) 7010bd680cdSMika Westerberg *available_down = down_bw; 7020bd680cdSMika Westerberg } 7030bd680cdSMika Westerberg 7040bd680cdSMika Westerberg if (*available_up < 0) 7050bd680cdSMika Westerberg *available_up = 0; 7060bd680cdSMika Westerberg if (*available_down < 0) 7070bd680cdSMika Westerberg *available_down = 0; 7080bd680cdSMika Westerberg 7090bd680cdSMika Westerberg return 0; 7100bd680cdSMika Westerberg } 7110bd680cdSMika Westerberg 7120bd680cdSMika Westerberg static int tb_release_unused_usb3_bandwidth(struct tb *tb, 7130bd680cdSMika Westerberg struct tb_port *src_port, 7140bd680cdSMika Westerberg struct tb_port *dst_port) 7150bd680cdSMika Westerberg { 7160bd680cdSMika Westerberg struct tb_tunnel *tunnel; 7170bd680cdSMika Westerberg 7180bd680cdSMika Westerberg tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 7190bd680cdSMika Westerberg return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0; 7200bd680cdSMika Westerberg } 7210bd680cdSMika Westerberg 7220bd680cdSMika Westerberg static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, 7230bd680cdSMika Westerberg struct tb_port *dst_port) 7240bd680cdSMika Westerberg { 7250bd680cdSMika Westerberg int ret, available_up, available_down; 7260bd680cdSMika Westerberg struct tb_tunnel *tunnel; 7270bd680cdSMika Westerberg 7280bd680cdSMika Westerberg tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 7290bd680cdSMika Westerberg if (!tunnel) 7300bd680cdSMika Westerberg return; 7310bd680cdSMika Westerberg 7320bd680cdSMika Westerberg tb_dbg(tb, "reclaiming unused bandwidth for USB3\n"); 7330bd680cdSMika Westerberg 7340bd680cdSMika Westerberg /* 7350bd680cdSMika Westerberg * Calculate available bandwidth for the first hop USB3 tunnel. 7360bd680cdSMika Westerberg * That determines the whole USB3 bandwidth for this branch. 7370bd680cdSMika Westerberg */ 7380bd680cdSMika Westerberg ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port, 7390bd680cdSMika Westerberg &available_up, &available_down); 7400bd680cdSMika Westerberg if (ret) { 7410bd680cdSMika Westerberg tb_warn(tb, "failed to calculate available bandwidth\n"); 7420bd680cdSMika Westerberg return; 7430bd680cdSMika Westerberg } 7440bd680cdSMika Westerberg 7450bd680cdSMika Westerberg tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n", 7460bd680cdSMika Westerberg available_up, available_down); 7470bd680cdSMika Westerberg 7480bd680cdSMika Westerberg tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down); 7490bd680cdSMika Westerberg } 7500bd680cdSMika Westerberg 751e6f81858SRajmohan Mani static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) 752e6f81858SRajmohan Mani { 753e6f81858SRajmohan Mani struct tb_switch *parent = tb_switch_parent(sw); 7540bd680cdSMika Westerberg int ret, available_up, available_down; 755e6f81858SRajmohan Mani struct tb_port *up, *down, *port; 756e6f81858SRajmohan Mani struct tb_cm *tcm = tb_priv(tb); 757e6f81858SRajmohan Mani struct tb_tunnel *tunnel; 758e6f81858SRajmohan Mani 759c6da62a2SMika Westerberg if (!tb_acpi_may_tunnel_usb3()) { 760c6da62a2SMika Westerberg tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n"); 761c6da62a2SMika Westerberg return 0; 762c6da62a2SMika Westerberg } 763c6da62a2SMika Westerberg 764e6f81858SRajmohan Mani up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); 765e6f81858SRajmohan Mani if (!up) 766e6f81858SRajmohan Mani return 0; 767e6f81858SRajmohan Mani 768bbcf40b3SMika Westerberg if (!sw->link_usb4) 769bbcf40b3SMika Westerberg return 0; 770bbcf40b3SMika Westerberg 771e6f81858SRajmohan Mani /* 772e6f81858SRajmohan Mani * Look up available down port. Since we are chaining it should 773e6f81858SRajmohan Mani * be found right above this switch. 774e6f81858SRajmohan Mani */ 7757ce54221SGil Fine port = tb_switch_downstream_port(sw); 776e6f81858SRajmohan Mani down = tb_find_usb3_down(parent, port); 777e6f81858SRajmohan Mani if (!down) 778e6f81858SRajmohan Mani return 0; 779e6f81858SRajmohan Mani 780e6f81858SRajmohan Mani if (tb_route(parent)) { 781e6f81858SRajmohan Mani struct tb_port *parent_up; 782e6f81858SRajmohan Mani /* 783e6f81858SRajmohan Mani * Check first that the parent switch has its upstream USB3 784e6f81858SRajmohan Mani * port enabled. Otherwise the chain is not complete and 785e6f81858SRajmohan Mani * there is no point setting up a new tunnel. 786e6f81858SRajmohan Mani */ 787e6f81858SRajmohan Mani parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); 788e6f81858SRajmohan Mani if (!parent_up || !tb_port_is_enabled(parent_up)) 789e6f81858SRajmohan Mani return 0; 7900bd680cdSMika Westerberg 7910bd680cdSMika Westerberg /* Make all unused bandwidth available for the new tunnel */ 7920bd680cdSMika Westerberg ret = tb_release_unused_usb3_bandwidth(tb, down, up); 7930bd680cdSMika Westerberg if (ret) 7940bd680cdSMika Westerberg return ret; 795e6f81858SRajmohan Mani } 796e6f81858SRajmohan Mani 7970bd680cdSMika Westerberg ret = tb_available_bandwidth(tb, down, up, &available_up, 7980bd680cdSMika Westerberg &available_down); 7990bd680cdSMika Westerberg if (ret) 8000bd680cdSMika Westerberg goto err_reclaim; 8010bd680cdSMika Westerberg 8020bd680cdSMika Westerberg tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n", 8030bd680cdSMika Westerberg available_up, available_down); 8040bd680cdSMika Westerberg 8050bd680cdSMika Westerberg tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up, 8060bd680cdSMika Westerberg available_down); 8070bd680cdSMika Westerberg if (!tunnel) { 8080bd680cdSMika Westerberg ret = -ENOMEM; 8090bd680cdSMika Westerberg goto err_reclaim; 8100bd680cdSMika Westerberg } 811e6f81858SRajmohan Mani 812e6f81858SRajmohan Mani if (tb_tunnel_activate(tunnel)) { 813e6f81858SRajmohan Mani tb_port_info(up, 814e6f81858SRajmohan Mani "USB3 tunnel activation failed, aborting\n"); 8150bd680cdSMika Westerberg ret = -EIO; 8160bd680cdSMika Westerberg goto err_free; 817e6f81858SRajmohan Mani } 818e6f81858SRajmohan Mani 819e6f81858SRajmohan Mani list_add_tail(&tunnel->list, &tcm->tunnel_list); 8200bd680cdSMika Westerberg if (tb_route(parent)) 8210bd680cdSMika Westerberg tb_reclaim_usb3_bandwidth(tb, down, up); 8220bd680cdSMika Westerberg 823e6f81858SRajmohan Mani return 0; 8240bd680cdSMika Westerberg 8250bd680cdSMika Westerberg err_free: 8260bd680cdSMika Westerberg tb_tunnel_free(tunnel); 8270bd680cdSMika Westerberg err_reclaim: 8280bd680cdSMika Westerberg if (tb_route(parent)) 8290bd680cdSMika Westerberg tb_reclaim_usb3_bandwidth(tb, down, up); 8300bd680cdSMika Westerberg 8310bd680cdSMika Westerberg return ret; 832e6f81858SRajmohan Mani } 833e6f81858SRajmohan Mani 834e6f81858SRajmohan Mani static int tb_create_usb3_tunnels(struct tb_switch *sw) 835e6f81858SRajmohan Mani { 836e6f81858SRajmohan Mani struct tb_port *port; 837e6f81858SRajmohan Mani int ret; 838e6f81858SRajmohan Mani 839c6da62a2SMika Westerberg if (!tb_acpi_may_tunnel_usb3()) 840c6da62a2SMika Westerberg return 0; 841c6da62a2SMika Westerberg 842e6f81858SRajmohan Mani if (tb_route(sw)) { 843e6f81858SRajmohan Mani ret = tb_tunnel_usb3(sw->tb, sw); 844e6f81858SRajmohan Mani if (ret) 845e6f81858SRajmohan Mani return ret; 846e6f81858SRajmohan Mani } 847e6f81858SRajmohan Mani 848e6f81858SRajmohan Mani tb_switch_for_each_port(sw, port) { 849e6f81858SRajmohan Mani if (!tb_port_has_remote(port)) 850e6f81858SRajmohan Mani continue; 851e6f81858SRajmohan Mani ret = tb_create_usb3_tunnels(port->remote->sw); 852e6f81858SRajmohan Mani if (ret) 853e6f81858SRajmohan Mani return ret; 854e6f81858SRajmohan Mani } 855e6f81858SRajmohan Mani 856e6f81858SRajmohan Mani return 0; 857e6f81858SRajmohan Mani } 858e6f81858SRajmohan Mani 8599da672a4SAndreas Noever static void tb_scan_port(struct tb_port *port); 8609da672a4SAndreas Noever 861877e50b3SLee Jones /* 8629da672a4SAndreas Noever * tb_scan_switch() - scan for and initialize downstream switches 8639da672a4SAndreas Noever */ 8649da672a4SAndreas Noever static void tb_scan_switch(struct tb_switch *sw) 8659da672a4SAndreas Noever { 866b433d010SMika Westerberg struct tb_port *port; 867b433d010SMika Westerberg 8686ac6faeeSMika Westerberg pm_runtime_get_sync(&sw->dev); 8696ac6faeeSMika Westerberg 870b433d010SMika Westerberg tb_switch_for_each_port(sw, port) 871b433d010SMika Westerberg tb_scan_port(port); 8726ac6faeeSMika Westerberg 8736ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&sw->dev); 8746ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&sw->dev); 8759da672a4SAndreas Noever } 8769da672a4SAndreas Noever 877877e50b3SLee Jones /* 8789da672a4SAndreas Noever * tb_scan_port() - check for and initialize switches below port 8799da672a4SAndreas Noever */ 8809da672a4SAndreas Noever static void tb_scan_port(struct tb_port *port) 8819da672a4SAndreas Noever { 88299cabbb0SMika Westerberg struct tb_cm *tcm = tb_priv(port->sw->tb); 883dfe40ca4SMika Westerberg struct tb_port *upstream_port; 8843fe95742SMika Westerberg bool discovery = false; 8859da672a4SAndreas Noever struct tb_switch *sw; 886dfe40ca4SMika Westerberg 8879da672a4SAndreas Noever if (tb_is_upstream_port(port)) 8889da672a4SAndreas Noever return; 8894f807e47SMika Westerberg 8904f807e47SMika Westerberg if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && 8914f807e47SMika Westerberg !tb_dp_port_is_enabled(port)) { 8924f807e47SMika Westerberg tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); 8934f807e47SMika Westerberg tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, 8944f807e47SMika Westerberg false); 8954f807e47SMika Westerberg return; 8964f807e47SMika Westerberg } 8974f807e47SMika Westerberg 8989da672a4SAndreas Noever if (port->config.type != TB_TYPE_PORT) 8999da672a4SAndreas Noever return; 900343fcb8cSAndreas Noever if (port->dual_link_port && port->link_nr) 901343fcb8cSAndreas Noever return; /* 902343fcb8cSAndreas Noever * Downstream switch is reachable through two ports. 903343fcb8cSAndreas Noever * Only scan on the primary port (link_nr == 0). 904343fcb8cSAndreas Noever */ 90523257cfcSMika Westerberg 90623257cfcSMika Westerberg if (port->usb4) 90723257cfcSMika Westerberg pm_runtime_get_sync(&port->usb4->dev); 90823257cfcSMika Westerberg 9099da672a4SAndreas Noever if (tb_wait_for_port(port, false) <= 0) 91023257cfcSMika Westerberg goto out_rpm_put; 9119da672a4SAndreas Noever if (port->remote) { 9127ea4cd6bSMika Westerberg tb_port_dbg(port, "port already has a remote\n"); 91323257cfcSMika Westerberg goto out_rpm_put; 9149da672a4SAndreas Noever } 915dacb1287SKranthi Kuntala 9163fb10ea4SRajmohan Mani tb_retimer_scan(port, true); 917dacb1287SKranthi Kuntala 918bfe778acSMika Westerberg sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, 919bfe778acSMika Westerberg tb_downstream_route(port)); 9207ea4cd6bSMika Westerberg if (IS_ERR(sw)) { 9217ea4cd6bSMika Westerberg /* 9227ea4cd6bSMika Westerberg * If there is an error accessing the connected switch 9237ea4cd6bSMika Westerberg * it may be connected to another domain. Also we allow 9247ea4cd6bSMika Westerberg * the other domain to be connected to a max depth switch. 9257ea4cd6bSMika Westerberg */ 9267ea4cd6bSMika Westerberg if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) 9277ea4cd6bSMika Westerberg tb_scan_xdomain(port); 92823257cfcSMika Westerberg goto out_rpm_put; 9297ea4cd6bSMika Westerberg } 930bfe778acSMika Westerberg 931bfe778acSMika Westerberg if (tb_switch_configure(sw)) { 932bfe778acSMika Westerberg tb_switch_put(sw); 93323257cfcSMika Westerberg goto out_rpm_put; 934bfe778acSMika Westerberg } 935bfe778acSMika Westerberg 93699cabbb0SMika Westerberg /* 9377ea4cd6bSMika Westerberg * If there was previously another domain connected remove it 9387ea4cd6bSMika Westerberg * first. 9397ea4cd6bSMika Westerberg */ 9407ea4cd6bSMika Westerberg if (port->xdomain) { 9417ea4cd6bSMika Westerberg tb_xdomain_remove(port->xdomain); 942284652a4SMika Westerberg tb_port_unconfigure_xdomain(port); 9437ea4cd6bSMika Westerberg port->xdomain = NULL; 9447ea4cd6bSMika Westerberg } 9457ea4cd6bSMika Westerberg 9467ea4cd6bSMika Westerberg /* 94799cabbb0SMika Westerberg * Do not send uevents until we have discovered all existing 94899cabbb0SMika Westerberg * tunnels and know which switches were authorized already by 94999cabbb0SMika Westerberg * the boot firmware. 95099cabbb0SMika Westerberg */ 9513fe95742SMika Westerberg if (!tcm->hotplug_active) { 95299cabbb0SMika Westerberg dev_set_uevent_suppress(&sw->dev, true); 9533fe95742SMika Westerberg discovery = true; 9543fe95742SMika Westerberg } 955f67cf491SMika Westerberg 9566ac6faeeSMika Westerberg /* 9576ac6faeeSMika Westerberg * At the moment Thunderbolt 2 and beyond (devices with LC) we 9586ac6faeeSMika Westerberg * can support runtime PM. 9596ac6faeeSMika Westerberg */ 9606ac6faeeSMika Westerberg sw->rpm = sw->generation > 1; 9616ac6faeeSMika Westerberg 962bfe778acSMika Westerberg if (tb_switch_add(sw)) { 963bfe778acSMika Westerberg tb_switch_put(sw); 96423257cfcSMika Westerberg goto out_rpm_put; 965bfe778acSMika Westerberg } 966bfe778acSMika Westerberg 967dfe40ca4SMika Westerberg /* Link the switches using both links if available */ 968dfe40ca4SMika Westerberg upstream_port = tb_upstream_port(sw); 969dfe40ca4SMika Westerberg port->remote = upstream_port; 970dfe40ca4SMika Westerberg upstream_port->remote = port; 971dfe40ca4SMika Westerberg if (port->dual_link_port && upstream_port->dual_link_port) { 972dfe40ca4SMika Westerberg port->dual_link_port->remote = upstream_port->dual_link_port; 973dfe40ca4SMika Westerberg upstream_port->dual_link_port->remote = port->dual_link_port; 974dfe40ca4SMika Westerberg } 975dfe40ca4SMika Westerberg 97691c0c120SMika Westerberg /* Enable lane bonding if supported */ 9772ca3263aSMika Westerberg tb_switch_lane_bonding_enable(sw); 978de462039SMika Westerberg /* Set the link configured */ 979de462039SMika Westerberg tb_switch_configure_link(sw); 980b017a46dSGil Fine /* 981b017a46dSGil Fine * CL0s and CL1 are enabled and supported together. 982b017a46dSGil Fine * Silently ignore CLx enabling in case CLx is not supported. 983b017a46dSGil Fine */ 9841a9b6cb8SMika Westerberg if (discovery) 9853fe95742SMika Westerberg tb_sw_dbg(sw, "discovery, not touching CL states\n"); 9861a9b6cb8SMika Westerberg else if (tb_enable_clx(sw)) 9871a9b6cb8SMika Westerberg tb_sw_warn(sw, "failed to enable CL states\n"); 9888a90e4faSGil Fine 989cf29b9afSRajmohan Mani if (tb_enable_tmu(sw)) 990cf29b9afSRajmohan Mani tb_sw_warn(sw, "failed to enable TMU\n"); 991cf29b9afSRajmohan Mani 992d49b4f04SMika Westerberg /* 993d49b4f04SMika Westerberg * Configuration valid needs to be set after the TMU has been 994d49b4f04SMika Westerberg * enabled for the upstream port of the router so we do it here. 995d49b4f04SMika Westerberg */ 996d49b4f04SMika Westerberg tb_switch_configuration_valid(sw); 997d49b4f04SMika Westerberg 998dacb1287SKranthi Kuntala /* Scan upstream retimers */ 9993fb10ea4SRajmohan Mani tb_retimer_scan(upstream_port, true); 1000dacb1287SKranthi Kuntala 1001e6f81858SRajmohan Mani /* 1002e6f81858SRajmohan Mani * Create USB 3.x tunnels only when the switch is plugged to the 1003e6f81858SRajmohan Mani * domain. This is because we scan the domain also during discovery 1004e6f81858SRajmohan Mani * and want to discover existing USB 3.x tunnels before we create 1005e6f81858SRajmohan Mani * any new. 1006e6f81858SRajmohan Mani */ 1007e6f81858SRajmohan Mani if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) 1008e6f81858SRajmohan Mani tb_sw_warn(sw, "USB3 tunnel creation failed\n"); 1009e6f81858SRajmohan Mani 1010e876f34aSMika Westerberg tb_add_dp_resources(sw); 10119da672a4SAndreas Noever tb_scan_switch(sw); 101223257cfcSMika Westerberg 101323257cfcSMika Westerberg out_rpm_put: 101423257cfcSMika Westerberg if (port->usb4) { 101523257cfcSMika Westerberg pm_runtime_mark_last_busy(&port->usb4->dev); 101623257cfcSMika Westerberg pm_runtime_put_autosuspend(&port->usb4->dev); 101723257cfcSMika Westerberg } 10189da672a4SAndreas Noever } 10199da672a4SAndreas Noever 10208afe909bSMika Westerberg static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) 10218afe909bSMika Westerberg { 10220bd680cdSMika Westerberg struct tb_port *src_port, *dst_port; 10230bd680cdSMika Westerberg struct tb *tb; 10240bd680cdSMika Westerberg 10258afe909bSMika Westerberg if (!tunnel) 10268afe909bSMika Westerberg return; 10278afe909bSMika Westerberg 10288afe909bSMika Westerberg tb_tunnel_deactivate(tunnel); 10298afe909bSMika Westerberg list_del(&tunnel->list); 10308afe909bSMika Westerberg 10310bd680cdSMika Westerberg tb = tunnel->tb; 10320bd680cdSMika Westerberg src_port = tunnel->src_port; 10330bd680cdSMika Westerberg dst_port = tunnel->dst_port; 10348afe909bSMika Westerberg 10350bd680cdSMika Westerberg switch (tunnel->type) { 10360bd680cdSMika Westerberg case TB_TUNNEL_DP: 10376ce35635SMika Westerberg tb_detach_bandwidth_group(src_port); 10380bd680cdSMika Westerberg /* 10390bd680cdSMika Westerberg * In case of DP tunnel make sure the DP IN resource is 10400bd680cdSMika Westerberg * deallocated properly. 10410bd680cdSMika Westerberg */ 10420bd680cdSMika Westerberg tb_switch_dealloc_dp_resource(src_port->sw, src_port); 10436ac6faeeSMika Westerberg /* Now we can allow the domain to runtime suspend again */ 10446ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&dst_port->sw->dev); 10456ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&dst_port->sw->dev); 10466ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&src_port->sw->dev); 10476ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&src_port->sw->dev); 10480bd680cdSMika Westerberg fallthrough; 10490bd680cdSMika Westerberg 10500bd680cdSMika Westerberg case TB_TUNNEL_USB3: 10510bd680cdSMika Westerberg tb_reclaim_usb3_bandwidth(tb, src_port, dst_port); 10520bd680cdSMika Westerberg break; 10530bd680cdSMika Westerberg 10540bd680cdSMika Westerberg default: 10550bd680cdSMika Westerberg /* 10560bd680cdSMika Westerberg * PCIe and DMA tunnels do not consume guaranteed 10570bd680cdSMika Westerberg * bandwidth. 10580bd680cdSMika Westerberg */ 10590bd680cdSMika Westerberg break; 10608afe909bSMika Westerberg } 10618afe909bSMika Westerberg 10628afe909bSMika Westerberg tb_tunnel_free(tunnel); 10634f807e47SMika Westerberg } 10644f807e47SMika Westerberg 1065877e50b3SLee Jones /* 10663364f0c1SAndreas Noever * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away 10673364f0c1SAndreas Noever */ 10683364f0c1SAndreas Noever static void tb_free_invalid_tunnels(struct tb *tb) 10693364f0c1SAndreas Noever { 10709d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 107193f36adeSMika Westerberg struct tb_tunnel *tunnel; 107293f36adeSMika Westerberg struct tb_tunnel *n; 10739d3cce0bSMika Westerberg 10749d3cce0bSMika Westerberg list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 10758afe909bSMika Westerberg if (tb_tunnel_is_invalid(tunnel)) 10768afe909bSMika Westerberg tb_deactivate_and_free_tunnel(tunnel); 10773364f0c1SAndreas Noever } 10783364f0c1SAndreas Noever } 10793364f0c1SAndreas Noever 1080877e50b3SLee Jones /* 108123dd5bb4SAndreas Noever * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches 108223dd5bb4SAndreas Noever */ 108323dd5bb4SAndreas Noever static void tb_free_unplugged_children(struct tb_switch *sw) 108423dd5bb4SAndreas Noever { 1085b433d010SMika Westerberg struct tb_port *port; 1086dfe40ca4SMika Westerberg 1087b433d010SMika Westerberg tb_switch_for_each_port(sw, port) { 1088dfe40ca4SMika Westerberg if (!tb_port_has_remote(port)) 108923dd5bb4SAndreas Noever continue; 1090dfe40ca4SMika Westerberg 109123dd5bb4SAndreas Noever if (port->remote->sw->is_unplugged) { 1092dacb1287SKranthi Kuntala tb_retimer_remove_all(port); 10938afe909bSMika Westerberg tb_remove_dp_resources(port->remote->sw); 1094de462039SMika Westerberg tb_switch_unconfigure_link(port->remote->sw); 109591c0c120SMika Westerberg tb_switch_lane_bonding_disable(port->remote->sw); 1096bfe778acSMika Westerberg tb_switch_remove(port->remote->sw); 109723dd5bb4SAndreas Noever port->remote = NULL; 1098dfe40ca4SMika Westerberg if (port->dual_link_port) 1099dfe40ca4SMika Westerberg port->dual_link_port->remote = NULL; 110023dd5bb4SAndreas Noever } else { 110123dd5bb4SAndreas Noever tb_free_unplugged_children(port->remote->sw); 110223dd5bb4SAndreas Noever } 110323dd5bb4SAndreas Noever } 110423dd5bb4SAndreas Noever } 110523dd5bb4SAndreas Noever 110699cabbb0SMika Westerberg static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, 110799cabbb0SMika Westerberg const struct tb_port *port) 11083364f0c1SAndreas Noever { 1109b0407983SMika Westerberg struct tb_port *down = NULL; 1110b0407983SMika Westerberg 111199cabbb0SMika Westerberg /* 111299cabbb0SMika Westerberg * To keep plugging devices consistently in the same PCIe 1113b0407983SMika Westerberg * hierarchy, do mapping here for switch downstream PCIe ports. 111499cabbb0SMika Westerberg */ 1115b0407983SMika Westerberg if (tb_switch_is_usb4(sw)) { 1116b0407983SMika Westerberg down = usb4_switch_map_pcie_down(sw, port); 1117b0407983SMika Westerberg } else if (!tb_route(sw)) { 111899cabbb0SMika Westerberg int phy_port = tb_phy_port_from_link(port->port); 111999cabbb0SMika Westerberg int index; 112099cabbb0SMika Westerberg 112199cabbb0SMika Westerberg /* 112299cabbb0SMika Westerberg * Hard-coded Thunderbolt port to PCIe down port mapping 112399cabbb0SMika Westerberg * per controller. 112499cabbb0SMika Westerberg */ 11257bffd97eSMika Westerberg if (tb_switch_is_cactus_ridge(sw) || 11267bffd97eSMika Westerberg tb_switch_is_alpine_ridge(sw)) 112799cabbb0SMika Westerberg index = !phy_port ? 6 : 7; 112817a8f815SMika Westerberg else if (tb_switch_is_falcon_ridge(sw)) 112999cabbb0SMika Westerberg index = !phy_port ? 6 : 8; 11307bffd97eSMika Westerberg else if (tb_switch_is_titan_ridge(sw)) 11317bffd97eSMika Westerberg index = !phy_port ? 8 : 9; 113299cabbb0SMika Westerberg else 113399cabbb0SMika Westerberg goto out; 113499cabbb0SMika Westerberg 113599cabbb0SMika Westerberg /* Validate the hard-coding */ 113699cabbb0SMika Westerberg if (WARN_ON(index > sw->config.max_port_number)) 113799cabbb0SMika Westerberg goto out; 1138b0407983SMika Westerberg 1139b0407983SMika Westerberg down = &sw->ports[index]; 1140b0407983SMika Westerberg } 1141b0407983SMika Westerberg 1142b0407983SMika Westerberg if (down) { 1143b0407983SMika Westerberg if (WARN_ON(!tb_port_is_pcie_down(down))) 114499cabbb0SMika Westerberg goto out; 11459cac51a0SMika Westerberg if (tb_pci_port_is_enabled(down)) 114699cabbb0SMika Westerberg goto out; 114799cabbb0SMika Westerberg 1148b0407983SMika Westerberg return down; 114999cabbb0SMika Westerberg } 115099cabbb0SMika Westerberg 115199cabbb0SMika Westerberg out: 1152e78db6f0SMika Westerberg return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); 115399cabbb0SMika Westerberg } 115499cabbb0SMika Westerberg 11556ce35635SMika Westerberg static void 11566ce35635SMika Westerberg tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group) 11576ce35635SMika Westerberg { 11586ce35635SMika Westerberg struct tb_tunnel *first_tunnel; 11596ce35635SMika Westerberg struct tb *tb = group->tb; 11606ce35635SMika Westerberg struct tb_port *in; 11616ce35635SMika Westerberg int ret; 11626ce35635SMika Westerberg 11636ce35635SMika Westerberg tb_dbg(tb, "re-calculating bandwidth estimation for group %u\n", 11646ce35635SMika Westerberg group->index); 11656ce35635SMika Westerberg 11666ce35635SMika Westerberg first_tunnel = NULL; 11676ce35635SMika Westerberg list_for_each_entry(in, &group->ports, group_list) { 11686ce35635SMika Westerberg int estimated_bw, estimated_up, estimated_down; 11696ce35635SMika Westerberg struct tb_tunnel *tunnel; 11706ce35635SMika Westerberg struct tb_port *out; 11716ce35635SMika Westerberg 11728d73f6b8SMika Westerberg if (!usb4_dp_port_bandwidth_mode_enabled(in)) 11736ce35635SMika Westerberg continue; 11746ce35635SMika Westerberg 11756ce35635SMika Westerberg tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, NULL); 11766ce35635SMika Westerberg if (WARN_ON(!tunnel)) 11776ce35635SMika Westerberg break; 11786ce35635SMika Westerberg 11796ce35635SMika Westerberg if (!first_tunnel) { 11806ce35635SMika Westerberg /* 11816ce35635SMika Westerberg * Since USB3 bandwidth is shared by all DP 11826ce35635SMika Westerberg * tunnels under the host router USB4 port, even 11836ce35635SMika Westerberg * if they do not begin from the host router, we 11846ce35635SMika Westerberg * can release USB3 bandwidth just once and not 11856ce35635SMika Westerberg * for each tunnel separately. 11866ce35635SMika Westerberg */ 11876ce35635SMika Westerberg first_tunnel = tunnel; 11886ce35635SMika Westerberg ret = tb_release_unused_usb3_bandwidth(tb, 11896ce35635SMika Westerberg first_tunnel->src_port, first_tunnel->dst_port); 11906ce35635SMika Westerberg if (ret) { 11916ce35635SMika Westerberg tb_port_warn(in, 11926ce35635SMika Westerberg "failed to release unused bandwidth\n"); 11936ce35635SMika Westerberg break; 11946ce35635SMika Westerberg } 11956ce35635SMika Westerberg } 11966ce35635SMika Westerberg 11976ce35635SMika Westerberg out = tunnel->dst_port; 11986ce35635SMika Westerberg ret = tb_available_bandwidth(tb, in, out, &estimated_up, 11996ce35635SMika Westerberg &estimated_down); 12006ce35635SMika Westerberg if (ret) { 12016ce35635SMika Westerberg tb_port_warn(in, 12026ce35635SMika Westerberg "failed to re-calculate estimated bandwidth\n"); 12036ce35635SMika Westerberg break; 12046ce35635SMika Westerberg } 12056ce35635SMika Westerberg 12066ce35635SMika Westerberg /* 12076ce35635SMika Westerberg * Estimated bandwidth includes: 12086ce35635SMika Westerberg * - already allocated bandwidth for the DP tunnel 12096ce35635SMika Westerberg * - available bandwidth along the path 12106ce35635SMika Westerberg * - bandwidth allocated for USB 3.x but not used. 12116ce35635SMika Westerberg */ 12126ce35635SMika Westerberg tb_port_dbg(in, "re-calculated estimated bandwidth %u/%u Mb/s\n", 12136ce35635SMika Westerberg estimated_up, estimated_down); 12146ce35635SMika Westerberg 12156ce35635SMika Westerberg if (in->sw->config.depth < out->sw->config.depth) 12166ce35635SMika Westerberg estimated_bw = estimated_down; 12176ce35635SMika Westerberg else 12186ce35635SMika Westerberg estimated_bw = estimated_up; 12196ce35635SMika Westerberg 12208d73f6b8SMika Westerberg if (usb4_dp_port_set_estimated_bandwidth(in, estimated_bw)) 12216ce35635SMika Westerberg tb_port_warn(in, "failed to update estimated bandwidth\n"); 12226ce35635SMika Westerberg } 12236ce35635SMika Westerberg 12246ce35635SMika Westerberg if (first_tunnel) 12256ce35635SMika Westerberg tb_reclaim_usb3_bandwidth(tb, first_tunnel->src_port, 12266ce35635SMika Westerberg first_tunnel->dst_port); 12276ce35635SMika Westerberg 12286ce35635SMika Westerberg tb_dbg(tb, "bandwidth estimation for group %u done\n", group->index); 12296ce35635SMika Westerberg } 12306ce35635SMika Westerberg 12316ce35635SMika Westerberg static void tb_recalc_estimated_bandwidth(struct tb *tb) 12326ce35635SMika Westerberg { 12336ce35635SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 12346ce35635SMika Westerberg int i; 12356ce35635SMika Westerberg 12366ce35635SMika Westerberg tb_dbg(tb, "bandwidth consumption changed, re-calculating estimated bandwidth\n"); 12376ce35635SMika Westerberg 12386ce35635SMika Westerberg for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { 12396ce35635SMika Westerberg struct tb_bandwidth_group *group = &tcm->groups[i]; 12406ce35635SMika Westerberg 12416ce35635SMika Westerberg if (!list_empty(&group->ports)) 12426ce35635SMika Westerberg tb_recalc_estimated_bandwidth_for_group(group); 12436ce35635SMika Westerberg } 12446ce35635SMika Westerberg 12456ce35635SMika Westerberg tb_dbg(tb, "bandwidth re-calculation done\n"); 12466ce35635SMika Westerberg } 12476ce35635SMika Westerberg 1248e876f34aSMika Westerberg static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) 1249e876f34aSMika Westerberg { 1250e876f34aSMika Westerberg struct tb_port *host_port, *port; 1251e876f34aSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 1252e876f34aSMika Westerberg 1253e876f34aSMika Westerberg host_port = tb_route(in->sw) ? 1254e876f34aSMika Westerberg tb_port_at(tb_route(in->sw), tb->root_switch) : NULL; 1255e876f34aSMika Westerberg 1256e876f34aSMika Westerberg list_for_each_entry(port, &tcm->dp_resources, list) { 1257e876f34aSMika Westerberg if (!tb_port_is_dpout(port)) 1258e876f34aSMika Westerberg continue; 1259e876f34aSMika Westerberg 1260e876f34aSMika Westerberg if (tb_port_is_enabled(port)) { 1261b0ef48fcSMika Westerberg tb_port_dbg(port, "DP OUT in use\n"); 1262e876f34aSMika Westerberg continue; 1263e876f34aSMika Westerberg } 1264e876f34aSMika Westerberg 1265e876f34aSMika Westerberg tb_port_dbg(port, "DP OUT available\n"); 1266e876f34aSMika Westerberg 1267e876f34aSMika Westerberg /* 1268e876f34aSMika Westerberg * Keep the DP tunnel under the topology starting from 1269e876f34aSMika Westerberg * the same host router downstream port. 1270e876f34aSMika Westerberg */ 1271e876f34aSMika Westerberg if (host_port && tb_route(port->sw)) { 1272e876f34aSMika Westerberg struct tb_port *p; 1273e876f34aSMika Westerberg 1274e876f34aSMika Westerberg p = tb_port_at(tb_route(port->sw), tb->root_switch); 1275e876f34aSMika Westerberg if (p != host_port) 1276e876f34aSMika Westerberg continue; 1277e876f34aSMika Westerberg } 1278e876f34aSMika Westerberg 1279e876f34aSMika Westerberg return port; 1280e876f34aSMika Westerberg } 1281e876f34aSMika Westerberg 1282e876f34aSMika Westerberg return NULL; 1283e876f34aSMika Westerberg } 1284e876f34aSMika Westerberg 12858afe909bSMika Westerberg static void tb_tunnel_dp(struct tb *tb) 12864f807e47SMika Westerberg { 12879d2d0a5cSMika Westerberg int available_up, available_down, ret, link_nr; 12884f807e47SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 12898afe909bSMika Westerberg struct tb_port *port, *in, *out; 12904f807e47SMika Westerberg struct tb_tunnel *tunnel; 12914f807e47SMika Westerberg 1292c6da62a2SMika Westerberg if (!tb_acpi_may_tunnel_dp()) { 1293c6da62a2SMika Westerberg tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n"); 1294c6da62a2SMika Westerberg return; 1295c6da62a2SMika Westerberg } 1296c6da62a2SMika Westerberg 12978afe909bSMika Westerberg /* 12988afe909bSMika Westerberg * Find pair of inactive DP IN and DP OUT adapters and then 12998afe909bSMika Westerberg * establish a DP tunnel between them. 13008afe909bSMika Westerberg */ 13018afe909bSMika Westerberg tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); 13024f807e47SMika Westerberg 13038afe909bSMika Westerberg in = NULL; 13048afe909bSMika Westerberg out = NULL; 13058afe909bSMika Westerberg list_for_each_entry(port, &tcm->dp_resources, list) { 1306e876f34aSMika Westerberg if (!tb_port_is_dpin(port)) 1307e876f34aSMika Westerberg continue; 1308e876f34aSMika Westerberg 13098afe909bSMika Westerberg if (tb_port_is_enabled(port)) { 1310b0ef48fcSMika Westerberg tb_port_dbg(port, "DP IN in use\n"); 13118afe909bSMika Westerberg continue; 13128afe909bSMika Westerberg } 13138afe909bSMika Westerberg 1314e876f34aSMika Westerberg tb_port_dbg(port, "DP IN available\n"); 13158afe909bSMika Westerberg 1316e876f34aSMika Westerberg out = tb_find_dp_out(tb, port); 1317e876f34aSMika Westerberg if (out) { 13188afe909bSMika Westerberg in = port; 1319e876f34aSMika Westerberg break; 1320e876f34aSMika Westerberg } 13218afe909bSMika Westerberg } 13228afe909bSMika Westerberg 13238afe909bSMika Westerberg if (!in) { 13248afe909bSMika Westerberg tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); 13258afe909bSMika Westerberg return; 13268afe909bSMika Westerberg } 13278afe909bSMika Westerberg if (!out) { 13288afe909bSMika Westerberg tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); 13298afe909bSMika Westerberg return; 13308afe909bSMika Westerberg } 13318afe909bSMika Westerberg 13326ac6faeeSMika Westerberg /* 13339d2d0a5cSMika Westerberg * This is only applicable to links that are not bonded (so 13349d2d0a5cSMika Westerberg * when Thunderbolt 1 hardware is involved somewhere in the 13359d2d0a5cSMika Westerberg * topology). For these try to share the DP bandwidth between 13369d2d0a5cSMika Westerberg * the two lanes. 13379d2d0a5cSMika Westerberg */ 13389d2d0a5cSMika Westerberg link_nr = 1; 13399d2d0a5cSMika Westerberg list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 13409d2d0a5cSMika Westerberg if (tb_tunnel_is_dp(tunnel)) { 13419d2d0a5cSMika Westerberg link_nr = 0; 13429d2d0a5cSMika Westerberg break; 13439d2d0a5cSMika Westerberg } 13449d2d0a5cSMika Westerberg } 13459d2d0a5cSMika Westerberg 13469d2d0a5cSMika Westerberg /* 13476ac6faeeSMika Westerberg * DP stream needs the domain to be active so runtime resume 13486ac6faeeSMika Westerberg * both ends of the tunnel. 13496ac6faeeSMika Westerberg * 13506ac6faeeSMika Westerberg * This should bring the routers in the middle active as well 13516ac6faeeSMika Westerberg * and keeps the domain from runtime suspending while the DP 13526ac6faeeSMika Westerberg * tunnel is active. 13536ac6faeeSMika Westerberg */ 13546ac6faeeSMika Westerberg pm_runtime_get_sync(&in->sw->dev); 13556ac6faeeSMika Westerberg pm_runtime_get_sync(&out->sw->dev); 13566ac6faeeSMika Westerberg 13578afe909bSMika Westerberg if (tb_switch_alloc_dp_resource(in->sw, in)) { 13588afe909bSMika Westerberg tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); 13596ac6faeeSMika Westerberg goto err_rpm_put; 13608afe909bSMika Westerberg } 13614f807e47SMika Westerberg 13626ce35635SMika Westerberg if (!tb_attach_bandwidth_group(tcm, in, out)) 13636ce35635SMika Westerberg goto err_dealloc_dp; 13646ce35635SMika Westerberg 13650bd680cdSMika Westerberg /* Make all unused USB3 bandwidth available for the new DP tunnel */ 13660bd680cdSMika Westerberg ret = tb_release_unused_usb3_bandwidth(tb, in, out); 13670bd680cdSMika Westerberg if (ret) { 13680bd680cdSMika Westerberg tb_warn(tb, "failed to release unused bandwidth\n"); 13696ce35635SMika Westerberg goto err_detach_group; 1370a11b88adSMika Westerberg } 1371a11b88adSMika Westerberg 13726ce35635SMika Westerberg ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down); 13730bd680cdSMika Westerberg if (ret) 13746ce35635SMika Westerberg goto err_reclaim_usb; 1375a11b88adSMika Westerberg 13760bd680cdSMika Westerberg tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n", 13770bd680cdSMika Westerberg available_up, available_down); 13780bd680cdSMika Westerberg 13799d2d0a5cSMika Westerberg tunnel = tb_tunnel_alloc_dp(tb, in, out, link_nr, available_up, 13809d2d0a5cSMika Westerberg available_down); 13814f807e47SMika Westerberg if (!tunnel) { 13828afe909bSMika Westerberg tb_port_dbg(out, "could not allocate DP tunnel\n"); 13836ce35635SMika Westerberg goto err_reclaim_usb; 13844f807e47SMika Westerberg } 13854f807e47SMika Westerberg 13864f807e47SMika Westerberg if (tb_tunnel_activate(tunnel)) { 13874f807e47SMika Westerberg tb_port_info(out, "DP tunnel activation failed, aborting\n"); 13880bd680cdSMika Westerberg goto err_free; 13894f807e47SMika Westerberg } 13904f807e47SMika Westerberg 13914f807e47SMika Westerberg list_add_tail(&tunnel->list, &tcm->tunnel_list); 13920bd680cdSMika Westerberg tb_reclaim_usb3_bandwidth(tb, in, out); 13936ce35635SMika Westerberg 13946ce35635SMika Westerberg /* Update the domain with the new bandwidth estimation */ 13956ce35635SMika Westerberg tb_recalc_estimated_bandwidth(tb); 13966ce35635SMika Westerberg 13973084b48fSGil Fine /* 13983084b48fSGil Fine * In case of DP tunnel exists, change host router's 1st children 13993084b48fSGil Fine * TMU mode to HiFi for CL0s to work. 14003084b48fSGil Fine */ 14017d283f41SMika Westerberg tb_increase_tmu_accuracy(tunnel); 14028afe909bSMika Westerberg return; 14038afe909bSMika Westerberg 14040bd680cdSMika Westerberg err_free: 14050bd680cdSMika Westerberg tb_tunnel_free(tunnel); 14066ce35635SMika Westerberg err_reclaim_usb: 14070bd680cdSMika Westerberg tb_reclaim_usb3_bandwidth(tb, in, out); 14086ce35635SMika Westerberg err_detach_group: 14096ce35635SMika Westerberg tb_detach_bandwidth_group(in); 14100bd680cdSMika Westerberg err_dealloc_dp: 14118afe909bSMika Westerberg tb_switch_dealloc_dp_resource(in->sw, in); 14126ac6faeeSMika Westerberg err_rpm_put: 14136ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&out->sw->dev); 14146ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&out->sw->dev); 14156ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&in->sw->dev); 14166ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&in->sw->dev); 14174f807e47SMika Westerberg } 14184f807e47SMika Westerberg 1419d8518f05SMika Westerberg static void tb_enter_redrive(struct tb_port *port) 1420d8518f05SMika Westerberg { 1421d8518f05SMika Westerberg struct tb_switch *sw = port->sw; 1422d8518f05SMika Westerberg 1423d8518f05SMika Westerberg if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE)) 1424d8518f05SMika Westerberg return; 1425d8518f05SMika Westerberg 1426d8518f05SMika Westerberg /* 1427d8518f05SMika Westerberg * If we get hot-unplug for the DP IN port of the host router 1428d8518f05SMika Westerberg * and the DP resource is not available anymore it means there 1429d8518f05SMika Westerberg * is a monitor connected directly to the Type-C port and we are 1430d8518f05SMika Westerberg * in "redrive" mode. For this to work we cannot enter RTD3 so 1431d8518f05SMika Westerberg * we bump up the runtime PM reference count here. 1432d8518f05SMika Westerberg */ 1433d8518f05SMika Westerberg if (!tb_port_is_dpin(port)) 1434d8518f05SMika Westerberg return; 1435d8518f05SMika Westerberg if (tb_route(sw)) 1436d8518f05SMika Westerberg return; 1437d8518f05SMika Westerberg if (!tb_switch_query_dp_resource(sw, port)) { 1438d8518f05SMika Westerberg port->redrive = true; 1439d8518f05SMika Westerberg pm_runtime_get(&sw->dev); 1440d8518f05SMika Westerberg tb_port_dbg(port, "enter redrive mode, keeping powered\n"); 1441d8518f05SMika Westerberg } 1442d8518f05SMika Westerberg } 1443d8518f05SMika Westerberg 1444d8518f05SMika Westerberg static void tb_exit_redrive(struct tb_port *port) 1445d8518f05SMika Westerberg { 1446d8518f05SMika Westerberg struct tb_switch *sw = port->sw; 1447d8518f05SMika Westerberg 1448d8518f05SMika Westerberg if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE)) 1449d8518f05SMika Westerberg return; 1450d8518f05SMika Westerberg 1451d8518f05SMika Westerberg if (!tb_port_is_dpin(port)) 1452d8518f05SMika Westerberg return; 1453d8518f05SMika Westerberg if (tb_route(sw)) 1454d8518f05SMika Westerberg return; 1455d8518f05SMika Westerberg if (port->redrive && tb_switch_query_dp_resource(sw, port)) { 1456d8518f05SMika Westerberg port->redrive = false; 1457d8518f05SMika Westerberg pm_runtime_put(&sw->dev); 1458d8518f05SMika Westerberg tb_port_dbg(port, "exit redrive mode\n"); 1459d8518f05SMika Westerberg } 1460d8518f05SMika Westerberg } 1461d8518f05SMika Westerberg 14628afe909bSMika Westerberg static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) 14634f807e47SMika Westerberg { 14648afe909bSMika Westerberg struct tb_port *in, *out; 14658afe909bSMika Westerberg struct tb_tunnel *tunnel; 14668afe909bSMika Westerberg 14678afe909bSMika Westerberg if (tb_port_is_dpin(port)) { 14688afe909bSMika Westerberg tb_port_dbg(port, "DP IN resource unavailable\n"); 14698afe909bSMika Westerberg in = port; 14708afe909bSMika Westerberg out = NULL; 14718afe909bSMika Westerberg } else { 14728afe909bSMika Westerberg tb_port_dbg(port, "DP OUT resource unavailable\n"); 14738afe909bSMika Westerberg in = NULL; 14748afe909bSMika Westerberg out = port; 14758afe909bSMika Westerberg } 14768afe909bSMika Westerberg 14778afe909bSMika Westerberg tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); 1478d8518f05SMika Westerberg if (tunnel) 14798afe909bSMika Westerberg tb_deactivate_and_free_tunnel(tunnel); 1480d8518f05SMika Westerberg else 1481d8518f05SMika Westerberg tb_enter_redrive(port); 14828afe909bSMika Westerberg list_del_init(&port->list); 14838afe909bSMika Westerberg 14848afe909bSMika Westerberg /* 14858afe909bSMika Westerberg * See if there is another DP OUT port that can be used for 14868afe909bSMika Westerberg * to create another tunnel. 14878afe909bSMika Westerberg */ 14886ce35635SMika Westerberg tb_recalc_estimated_bandwidth(tb); 14898afe909bSMika Westerberg tb_tunnel_dp(tb); 14908afe909bSMika Westerberg } 14918afe909bSMika Westerberg 14928afe909bSMika Westerberg static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) 14938afe909bSMika Westerberg { 14948afe909bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 14958afe909bSMika Westerberg struct tb_port *p; 14968afe909bSMika Westerberg 14978afe909bSMika Westerberg if (tb_port_is_enabled(port)) 14988afe909bSMika Westerberg return; 14998afe909bSMika Westerberg 15008afe909bSMika Westerberg list_for_each_entry(p, &tcm->dp_resources, list) { 15018afe909bSMika Westerberg if (p == port) 15028afe909bSMika Westerberg return; 15038afe909bSMika Westerberg } 15048afe909bSMika Westerberg 15058afe909bSMika Westerberg tb_port_dbg(port, "DP %s resource available\n", 15068afe909bSMika Westerberg tb_port_is_dpin(port) ? "IN" : "OUT"); 15078afe909bSMika Westerberg list_add_tail(&port->list, &tcm->dp_resources); 1508d8518f05SMika Westerberg tb_exit_redrive(port); 15098afe909bSMika Westerberg 15108afe909bSMika Westerberg /* Look for suitable DP IN <-> DP OUT pairs now */ 15118afe909bSMika Westerberg tb_tunnel_dp(tb); 15124f807e47SMika Westerberg } 15134f807e47SMika Westerberg 151481a2e3e4SMika Westerberg static void tb_disconnect_and_release_dp(struct tb *tb) 151581a2e3e4SMika Westerberg { 151681a2e3e4SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 151781a2e3e4SMika Westerberg struct tb_tunnel *tunnel, *n; 151881a2e3e4SMika Westerberg 151981a2e3e4SMika Westerberg /* 152081a2e3e4SMika Westerberg * Tear down all DP tunnels and release their resources. They 152181a2e3e4SMika Westerberg * will be re-established after resume based on plug events. 152281a2e3e4SMika Westerberg */ 152381a2e3e4SMika Westerberg list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) { 152481a2e3e4SMika Westerberg if (tb_tunnel_is_dp(tunnel)) 152581a2e3e4SMika Westerberg tb_deactivate_and_free_tunnel(tunnel); 152681a2e3e4SMika Westerberg } 152781a2e3e4SMika Westerberg 152881a2e3e4SMika Westerberg while (!list_empty(&tcm->dp_resources)) { 152981a2e3e4SMika Westerberg struct tb_port *port; 153081a2e3e4SMika Westerberg 153181a2e3e4SMika Westerberg port = list_first_entry(&tcm->dp_resources, 153281a2e3e4SMika Westerberg struct tb_port, list); 153381a2e3e4SMika Westerberg list_del_init(&port->list); 153481a2e3e4SMika Westerberg } 153581a2e3e4SMika Westerberg } 153681a2e3e4SMika Westerberg 15373da88be2SMika Westerberg static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw) 15383da88be2SMika Westerberg { 15393da88be2SMika Westerberg struct tb_tunnel *tunnel; 15403da88be2SMika Westerberg struct tb_port *up; 15413da88be2SMika Westerberg 15423da88be2SMika Westerberg up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 15433da88be2SMika Westerberg if (WARN_ON(!up)) 15443da88be2SMika Westerberg return -ENODEV; 15453da88be2SMika Westerberg 15463da88be2SMika Westerberg tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up); 15473da88be2SMika Westerberg if (WARN_ON(!tunnel)) 15483da88be2SMika Westerberg return -ENODEV; 15493da88be2SMika Westerberg 155030a4eca6SMika Westerberg tb_switch_xhci_disconnect(sw); 155130a4eca6SMika Westerberg 15523da88be2SMika Westerberg tb_tunnel_deactivate(tunnel); 15533da88be2SMika Westerberg list_del(&tunnel->list); 15543da88be2SMika Westerberg tb_tunnel_free(tunnel); 15553da88be2SMika Westerberg return 0; 15563da88be2SMika Westerberg } 15573da88be2SMika Westerberg 155899cabbb0SMika Westerberg static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) 155999cabbb0SMika Westerberg { 156099cabbb0SMika Westerberg struct tb_port *up, *down, *port; 15619d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 156299cabbb0SMika Westerberg struct tb_tunnel *tunnel; 15639d3cce0bSMika Westerberg 1564386e5e29SMika Westerberg up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 156599cabbb0SMika Westerberg if (!up) 156699cabbb0SMika Westerberg return 0; 15673364f0c1SAndreas Noever 156899cabbb0SMika Westerberg /* 156999cabbb0SMika Westerberg * Look up available down port. Since we are chaining it should 157099cabbb0SMika Westerberg * be found right above this switch. 157199cabbb0SMika Westerberg */ 15727ce54221SGil Fine port = tb_switch_downstream_port(sw); 15737ce54221SGil Fine down = tb_find_pcie_down(tb_switch_parent(sw), port); 157499cabbb0SMika Westerberg if (!down) 157599cabbb0SMika Westerberg return 0; 15763364f0c1SAndreas Noever 157799cabbb0SMika Westerberg tunnel = tb_tunnel_alloc_pci(tb, up, down); 157899cabbb0SMika Westerberg if (!tunnel) 157999cabbb0SMika Westerberg return -ENOMEM; 15803364f0c1SAndreas Noever 158193f36adeSMika Westerberg if (tb_tunnel_activate(tunnel)) { 158299cabbb0SMika Westerberg tb_port_info(up, 15833364f0c1SAndreas Noever "PCIe tunnel activation failed, aborting\n"); 158493f36adeSMika Westerberg tb_tunnel_free(tunnel); 158599cabbb0SMika Westerberg return -EIO; 15863364f0c1SAndreas Noever } 15873364f0c1SAndreas Noever 158843f977bcSGil Fine /* 158943f977bcSGil Fine * PCIe L1 is needed to enable CL0s for Titan Ridge so enable it 159043f977bcSGil Fine * here. 159143f977bcSGil Fine */ 159243f977bcSGil Fine if (tb_switch_pcie_l1_enable(sw)) 159343f977bcSGil Fine tb_sw_warn(sw, "failed to enable PCIe L1 for Titan Ridge\n"); 159443f977bcSGil Fine 159530a4eca6SMika Westerberg if (tb_switch_xhci_connect(sw)) 159630a4eca6SMika Westerberg tb_sw_warn(sw, "failed to connect xHCI\n"); 159730a4eca6SMika Westerberg 159899cabbb0SMika Westerberg list_add_tail(&tunnel->list, &tcm->tunnel_list); 159999cabbb0SMika Westerberg return 0; 16003364f0c1SAndreas Noever } 16019da672a4SAndreas Noever 1602180b0689SMika Westerberg static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1603180b0689SMika Westerberg int transmit_path, int transmit_ring, 1604180b0689SMika Westerberg int receive_path, int receive_ring) 16057ea4cd6bSMika Westerberg { 16067ea4cd6bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 16077ea4cd6bSMika Westerberg struct tb_port *nhi_port, *dst_port; 16087ea4cd6bSMika Westerberg struct tb_tunnel *tunnel; 16097ea4cd6bSMika Westerberg struct tb_switch *sw; 161053ba2e16SMika Westerberg int ret; 16117ea4cd6bSMika Westerberg 16127ea4cd6bSMika Westerberg sw = tb_to_switch(xd->dev.parent); 16137ea4cd6bSMika Westerberg dst_port = tb_port_at(xd->route, sw); 1614386e5e29SMika Westerberg nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 16157ea4cd6bSMika Westerberg 16167ea4cd6bSMika Westerberg mutex_lock(&tb->lock); 161753ba2e16SMika Westerberg 161853ba2e16SMika Westerberg /* 161953ba2e16SMika Westerberg * When tunneling DMA paths the link should not enter CL states 162053ba2e16SMika Westerberg * so disable them now. 162153ba2e16SMika Westerberg */ 162253ba2e16SMika Westerberg tb_disable_clx(sw); 162353ba2e16SMika Westerberg 1624180b0689SMika Westerberg tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path, 1625180b0689SMika Westerberg transmit_ring, receive_path, receive_ring); 16267ea4cd6bSMika Westerberg if (!tunnel) { 162753ba2e16SMika Westerberg ret = -ENOMEM; 162853ba2e16SMika Westerberg goto err_clx; 16297ea4cd6bSMika Westerberg } 16307ea4cd6bSMika Westerberg 16317ea4cd6bSMika Westerberg if (tb_tunnel_activate(tunnel)) { 16327ea4cd6bSMika Westerberg tb_port_info(nhi_port, 16337ea4cd6bSMika Westerberg "DMA tunnel activation failed, aborting\n"); 163453ba2e16SMika Westerberg ret = -EIO; 163553ba2e16SMika Westerberg goto err_free; 16367ea4cd6bSMika Westerberg } 16377ea4cd6bSMika Westerberg 16387ea4cd6bSMika Westerberg list_add_tail(&tunnel->list, &tcm->tunnel_list); 16397ea4cd6bSMika Westerberg mutex_unlock(&tb->lock); 16407ea4cd6bSMika Westerberg return 0; 164153ba2e16SMika Westerberg 164253ba2e16SMika Westerberg err_free: 164353ba2e16SMika Westerberg tb_tunnel_free(tunnel); 164453ba2e16SMika Westerberg err_clx: 164553ba2e16SMika Westerberg tb_enable_clx(sw); 164653ba2e16SMika Westerberg mutex_unlock(&tb->lock); 164753ba2e16SMika Westerberg 164853ba2e16SMika Westerberg return ret; 16497ea4cd6bSMika Westerberg } 16507ea4cd6bSMika Westerberg 1651180b0689SMika Westerberg static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1652180b0689SMika Westerberg int transmit_path, int transmit_ring, 1653180b0689SMika Westerberg int receive_path, int receive_ring) 16547ea4cd6bSMika Westerberg { 1655180b0689SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 1656180b0689SMika Westerberg struct tb_port *nhi_port, *dst_port; 1657180b0689SMika Westerberg struct tb_tunnel *tunnel, *n; 16587ea4cd6bSMika Westerberg struct tb_switch *sw; 16597ea4cd6bSMika Westerberg 16607ea4cd6bSMika Westerberg sw = tb_to_switch(xd->dev.parent); 16617ea4cd6bSMika Westerberg dst_port = tb_port_at(xd->route, sw); 1662180b0689SMika Westerberg nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 16637ea4cd6bSMika Westerberg 1664180b0689SMika Westerberg list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 1665180b0689SMika Westerberg if (!tb_tunnel_is_dma(tunnel)) 1666180b0689SMika Westerberg continue; 1667180b0689SMika Westerberg if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port) 1668180b0689SMika Westerberg continue; 1669180b0689SMika Westerberg 1670180b0689SMika Westerberg if (tb_tunnel_match_dma(tunnel, transmit_path, transmit_ring, 1671180b0689SMika Westerberg receive_path, receive_ring)) 16728afe909bSMika Westerberg tb_deactivate_and_free_tunnel(tunnel); 16737ea4cd6bSMika Westerberg } 167453ba2e16SMika Westerberg 167553ba2e16SMika Westerberg /* 167653ba2e16SMika Westerberg * Try to re-enable CL states now, it is OK if this fails 167753ba2e16SMika Westerberg * because we may still have another DMA tunnel active through 167853ba2e16SMika Westerberg * the same host router USB4 downstream port. 167953ba2e16SMika Westerberg */ 168053ba2e16SMika Westerberg tb_enable_clx(sw); 1681180b0689SMika Westerberg } 16827ea4cd6bSMika Westerberg 1683180b0689SMika Westerberg static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1684180b0689SMika Westerberg int transmit_path, int transmit_ring, 1685180b0689SMika Westerberg int receive_path, int receive_ring) 16867ea4cd6bSMika Westerberg { 16877ea4cd6bSMika Westerberg if (!xd->is_unplugged) { 16887ea4cd6bSMika Westerberg mutex_lock(&tb->lock); 1689180b0689SMika Westerberg __tb_disconnect_xdomain_paths(tb, xd, transmit_path, 1690180b0689SMika Westerberg transmit_ring, receive_path, 1691180b0689SMika Westerberg receive_ring); 16927ea4cd6bSMika Westerberg mutex_unlock(&tb->lock); 16937ea4cd6bSMika Westerberg } 16947ea4cd6bSMika Westerberg return 0; 16957ea4cd6bSMika Westerberg } 16967ea4cd6bSMika Westerberg 1697d6cc51cdSAndreas Noever /* hotplug handling */ 1698d6cc51cdSAndreas Noever 1699877e50b3SLee Jones /* 1700d6cc51cdSAndreas Noever * tb_handle_hotplug() - handle hotplug event 1701d6cc51cdSAndreas Noever * 1702d6cc51cdSAndreas Noever * Executes on tb->wq. 1703d6cc51cdSAndreas Noever */ 1704d6cc51cdSAndreas Noever static void tb_handle_hotplug(struct work_struct *work) 1705d6cc51cdSAndreas Noever { 1706d6cc51cdSAndreas Noever struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 1707d6cc51cdSAndreas Noever struct tb *tb = ev->tb; 17089d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 1709053596d9SAndreas Noever struct tb_switch *sw; 1710053596d9SAndreas Noever struct tb_port *port; 1711284652a4SMika Westerberg 17126ac6faeeSMika Westerberg /* Bring the domain back from sleep if it was suspended */ 17136ac6faeeSMika Westerberg pm_runtime_get_sync(&tb->dev); 17146ac6faeeSMika Westerberg 1715d6cc51cdSAndreas Noever mutex_lock(&tb->lock); 17169d3cce0bSMika Westerberg if (!tcm->hotplug_active) 1717d6cc51cdSAndreas Noever goto out; /* during init, suspend or shutdown */ 1718d6cc51cdSAndreas Noever 17198f965efdSMika Westerberg sw = tb_switch_find_by_route(tb, ev->route); 1720053596d9SAndreas Noever if (!sw) { 1721053596d9SAndreas Noever tb_warn(tb, 1722053596d9SAndreas Noever "hotplug event from non existent switch %llx:%x (unplug: %d)\n", 1723053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 1724053596d9SAndreas Noever goto out; 1725053596d9SAndreas Noever } 1726053596d9SAndreas Noever if (ev->port > sw->config.max_port_number) { 1727053596d9SAndreas Noever tb_warn(tb, 1728053596d9SAndreas Noever "hotplug event from non existent port %llx:%x (unplug: %d)\n", 1729053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 17308f965efdSMika Westerberg goto put_sw; 1731053596d9SAndreas Noever } 1732053596d9SAndreas Noever port = &sw->ports[ev->port]; 1733053596d9SAndreas Noever if (tb_is_upstream_port(port)) { 1734dfe40ca4SMika Westerberg tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", 1735053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 17368f965efdSMika Westerberg goto put_sw; 1737053596d9SAndreas Noever } 17386ac6faeeSMika Westerberg 17396ac6faeeSMika Westerberg pm_runtime_get_sync(&sw->dev); 17406ac6faeeSMika Westerberg 1741053596d9SAndreas Noever if (ev->unplug) { 1742dacb1287SKranthi Kuntala tb_retimer_remove_all(port); 1743dacb1287SKranthi Kuntala 1744dfe40ca4SMika Westerberg if (tb_port_has_remote(port)) { 17457ea4cd6bSMika Westerberg tb_port_dbg(port, "switch unplugged\n"); 1746aae20bb6SLukas Wunner tb_sw_set_unplugged(port->remote->sw); 17473364f0c1SAndreas Noever tb_free_invalid_tunnels(tb); 17488afe909bSMika Westerberg tb_remove_dp_resources(port->remote->sw); 1749cf29b9afSRajmohan Mani tb_switch_tmu_disable(port->remote->sw); 1750de462039SMika Westerberg tb_switch_unconfigure_link(port->remote->sw); 175191c0c120SMika Westerberg tb_switch_lane_bonding_disable(port->remote->sw); 1752bfe778acSMika Westerberg tb_switch_remove(port->remote->sw); 1753053596d9SAndreas Noever port->remote = NULL; 1754dfe40ca4SMika Westerberg if (port->dual_link_port) 1755dfe40ca4SMika Westerberg port->dual_link_port->remote = NULL; 17568afe909bSMika Westerberg /* Maybe we can create another DP tunnel */ 17576ce35635SMika Westerberg tb_recalc_estimated_bandwidth(tb); 17588afe909bSMika Westerberg tb_tunnel_dp(tb); 17597ea4cd6bSMika Westerberg } else if (port->xdomain) { 17607ea4cd6bSMika Westerberg struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); 17617ea4cd6bSMika Westerberg 17627ea4cd6bSMika Westerberg tb_port_dbg(port, "xdomain unplugged\n"); 17637ea4cd6bSMika Westerberg /* 17647ea4cd6bSMika Westerberg * Service drivers are unbound during 17657ea4cd6bSMika Westerberg * tb_xdomain_remove() so setting XDomain as 17667ea4cd6bSMika Westerberg * unplugged here prevents deadlock if they call 17677ea4cd6bSMika Westerberg * tb_xdomain_disable_paths(). We will tear down 1768180b0689SMika Westerberg * all the tunnels below. 17697ea4cd6bSMika Westerberg */ 17707ea4cd6bSMika Westerberg xd->is_unplugged = true; 17717ea4cd6bSMika Westerberg tb_xdomain_remove(xd); 17727ea4cd6bSMika Westerberg port->xdomain = NULL; 1773180b0689SMika Westerberg __tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1); 17747ea4cd6bSMika Westerberg tb_xdomain_put(xd); 1775284652a4SMika Westerberg tb_port_unconfigure_xdomain(port); 17768afe909bSMika Westerberg } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 17778afe909bSMika Westerberg tb_dp_resource_unavailable(tb, port); 177830a4eca6SMika Westerberg } else if (!port->port) { 177930a4eca6SMika Westerberg tb_sw_dbg(sw, "xHCI disconnect request\n"); 178030a4eca6SMika Westerberg tb_switch_xhci_disconnect(sw); 1781053596d9SAndreas Noever } else { 178262efe699SMika Westerberg tb_port_dbg(port, 1783053596d9SAndreas Noever "got unplug event for disconnected port, ignoring\n"); 1784053596d9SAndreas Noever } 1785053596d9SAndreas Noever } else if (port->remote) { 178662efe699SMika Westerberg tb_port_dbg(port, "got plug event for connected port, ignoring\n"); 178730a4eca6SMika Westerberg } else if (!port->port && sw->authorized) { 178830a4eca6SMika Westerberg tb_sw_dbg(sw, "xHCI connect request\n"); 178930a4eca6SMika Westerberg tb_switch_xhci_connect(sw); 1790053596d9SAndreas Noever } else { 1791344e0643SMika Westerberg if (tb_port_is_null(port)) { 179262efe699SMika Westerberg tb_port_dbg(port, "hotplug: scanning\n"); 1793053596d9SAndreas Noever tb_scan_port(port); 179499cabbb0SMika Westerberg if (!port->remote) 179562efe699SMika Westerberg tb_port_dbg(port, "hotplug: no switch found\n"); 17968afe909bSMika Westerberg } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 17978afe909bSMika Westerberg tb_dp_resource_available(tb, port); 1798053596d9SAndreas Noever } 1799344e0643SMika Westerberg } 18008f965efdSMika Westerberg 18016ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&sw->dev); 18026ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&sw->dev); 18036ac6faeeSMika Westerberg 18048f965efdSMika Westerberg put_sw: 18058f965efdSMika Westerberg tb_switch_put(sw); 1806d6cc51cdSAndreas Noever out: 1807d6cc51cdSAndreas Noever mutex_unlock(&tb->lock); 18086ac6faeeSMika Westerberg 18096ac6faeeSMika Westerberg pm_runtime_mark_last_busy(&tb->dev); 18106ac6faeeSMika Westerberg pm_runtime_put_autosuspend(&tb->dev); 18116ac6faeeSMika Westerberg 1812d6cc51cdSAndreas Noever kfree(ev); 1813d6cc51cdSAndreas Noever } 1814d6cc51cdSAndreas Noever 18156ce35635SMika Westerberg static int tb_alloc_dp_bandwidth(struct tb_tunnel *tunnel, int *requested_up, 18166ce35635SMika Westerberg int *requested_down) 18176ce35635SMika Westerberg { 18186ce35635SMika Westerberg int allocated_up, allocated_down, available_up, available_down, ret; 18196ce35635SMika Westerberg int requested_up_corrected, requested_down_corrected, granularity; 18206ce35635SMika Westerberg int max_up, max_down, max_up_rounded, max_down_rounded; 18216ce35635SMika Westerberg struct tb *tb = tunnel->tb; 18226ce35635SMika Westerberg struct tb_port *in, *out; 18236ce35635SMika Westerberg 18246ce35635SMika Westerberg ret = tb_tunnel_allocated_bandwidth(tunnel, &allocated_up, &allocated_down); 18256ce35635SMika Westerberg if (ret) 18266ce35635SMika Westerberg return ret; 18276ce35635SMika Westerberg 18286ce35635SMika Westerberg in = tunnel->src_port; 18296ce35635SMika Westerberg out = tunnel->dst_port; 18306ce35635SMika Westerberg 18316ce35635SMika Westerberg tb_port_dbg(in, "bandwidth allocated currently %d/%d Mb/s\n", 18326ce35635SMika Westerberg allocated_up, allocated_down); 18336ce35635SMika Westerberg 18346ce35635SMika Westerberg /* 18356ce35635SMika Westerberg * If we get rounded up request from graphics side, say HBR2 x 4 18366ce35635SMika Westerberg * that is 17500 instead of 17280 (this is because of the 18376ce35635SMika Westerberg * granularity), we allow it too. Here the graphics has already 18386ce35635SMika Westerberg * negotiated with the DPRX the maximum possible rates (which is 18396ce35635SMika Westerberg * 17280 in this case). 18406ce35635SMika Westerberg * 18416ce35635SMika Westerberg * Since the link cannot go higher than 17280 we use that in our 18426ce35635SMika Westerberg * calculations but the DP IN adapter Allocated BW write must be 18436ce35635SMika Westerberg * the same value (17500) otherwise the adapter will mark it as 18446ce35635SMika Westerberg * failed for graphics. 18456ce35635SMika Westerberg */ 18466ce35635SMika Westerberg ret = tb_tunnel_maximum_bandwidth(tunnel, &max_up, &max_down); 18476ce35635SMika Westerberg if (ret) 18486ce35635SMika Westerberg return ret; 18496ce35635SMika Westerberg 18506ce35635SMika Westerberg ret = usb4_dp_port_granularity(in); 18516ce35635SMika Westerberg if (ret < 0) 18526ce35635SMika Westerberg return ret; 18536ce35635SMika Westerberg granularity = ret; 18546ce35635SMika Westerberg 18556ce35635SMika Westerberg max_up_rounded = roundup(max_up, granularity); 18566ce35635SMika Westerberg max_down_rounded = roundup(max_down, granularity); 18576ce35635SMika Westerberg 18586ce35635SMika Westerberg /* 18596ce35635SMika Westerberg * This will "fix" the request down to the maximum supported 18606ce35635SMika Westerberg * rate * lanes if it is at the maximum rounded up level. 18616ce35635SMika Westerberg */ 18626ce35635SMika Westerberg requested_up_corrected = *requested_up; 18636ce35635SMika Westerberg if (requested_up_corrected == max_up_rounded) 18646ce35635SMika Westerberg requested_up_corrected = max_up; 18656ce35635SMika Westerberg else if (requested_up_corrected < 0) 18666ce35635SMika Westerberg requested_up_corrected = 0; 18676ce35635SMika Westerberg requested_down_corrected = *requested_down; 18686ce35635SMika Westerberg if (requested_down_corrected == max_down_rounded) 18696ce35635SMika Westerberg requested_down_corrected = max_down; 18706ce35635SMika Westerberg else if (requested_down_corrected < 0) 18716ce35635SMika Westerberg requested_down_corrected = 0; 18726ce35635SMika Westerberg 18736ce35635SMika Westerberg tb_port_dbg(in, "corrected bandwidth request %d/%d Mb/s\n", 18746ce35635SMika Westerberg requested_up_corrected, requested_down_corrected); 18756ce35635SMika Westerberg 18766ce35635SMika Westerberg if ((*requested_up >= 0 && requested_up_corrected > max_up_rounded) || 18776ce35635SMika Westerberg (*requested_down >= 0 && requested_down_corrected > max_down_rounded)) { 18786ce35635SMika Westerberg tb_port_dbg(in, "bandwidth request too high (%d/%d Mb/s > %d/%d Mb/s)\n", 18796ce35635SMika Westerberg requested_up_corrected, requested_down_corrected, 18806ce35635SMika Westerberg max_up_rounded, max_down_rounded); 18816ce35635SMika Westerberg return -ENOBUFS; 18826ce35635SMika Westerberg } 18836ce35635SMika Westerberg 18846ce35635SMika Westerberg if ((*requested_up >= 0 && requested_up_corrected <= allocated_up) || 18856ce35635SMika Westerberg (*requested_down >= 0 && requested_down_corrected <= allocated_down)) { 18866ce35635SMika Westerberg /* 18876ce35635SMika Westerberg * If requested bandwidth is less or equal than what is 18886ce35635SMika Westerberg * currently allocated to that tunnel we simply change 18896ce35635SMika Westerberg * the reservation of the tunnel. Since all the tunnels 18906ce35635SMika Westerberg * going out from the same USB4 port are in the same 18916ce35635SMika Westerberg * group the released bandwidth will be taken into 18926ce35635SMika Westerberg * account for the other tunnels automatically below. 18936ce35635SMika Westerberg */ 18946ce35635SMika Westerberg return tb_tunnel_alloc_bandwidth(tunnel, requested_up, 18956ce35635SMika Westerberg requested_down); 18966ce35635SMika Westerberg } 18976ce35635SMika Westerberg 18986ce35635SMika Westerberg /* 18996ce35635SMika Westerberg * More bandwidth is requested. Release all the potential 19006ce35635SMika Westerberg * bandwidth from USB3 first. 19016ce35635SMika Westerberg */ 19026ce35635SMika Westerberg ret = tb_release_unused_usb3_bandwidth(tb, in, out); 19036ce35635SMika Westerberg if (ret) 19046ce35635SMika Westerberg return ret; 19056ce35635SMika Westerberg 19066ce35635SMika Westerberg /* 19076ce35635SMika Westerberg * Then go over all tunnels that cross the same USB4 ports (they 19086ce35635SMika Westerberg * are also in the same group but we use the same function here 19096ce35635SMika Westerberg * that we use with the normal bandwidth allocation). 19106ce35635SMika Westerberg */ 19116ce35635SMika Westerberg ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down); 19126ce35635SMika Westerberg if (ret) 19136ce35635SMika Westerberg goto reclaim; 19146ce35635SMika Westerberg 19156ce35635SMika Westerberg tb_port_dbg(in, "bandwidth available for allocation %d/%d Mb/s\n", 19166ce35635SMika Westerberg available_up, available_down); 19176ce35635SMika Westerberg 19186ce35635SMika Westerberg if ((*requested_up >= 0 && available_up >= requested_up_corrected) || 19196ce35635SMika Westerberg (*requested_down >= 0 && available_down >= requested_down_corrected)) { 19206ce35635SMika Westerberg ret = tb_tunnel_alloc_bandwidth(tunnel, requested_up, 19216ce35635SMika Westerberg requested_down); 19226ce35635SMika Westerberg } else { 19236ce35635SMika Westerberg ret = -ENOBUFS; 19246ce35635SMika Westerberg } 19256ce35635SMika Westerberg 19266ce35635SMika Westerberg reclaim: 19276ce35635SMika Westerberg tb_reclaim_usb3_bandwidth(tb, in, out); 19286ce35635SMika Westerberg return ret; 19296ce35635SMika Westerberg } 19306ce35635SMika Westerberg 19316ce35635SMika Westerberg static void tb_handle_dp_bandwidth_request(struct work_struct *work) 19326ce35635SMika Westerberg { 19336ce35635SMika Westerberg struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 19346ce35635SMika Westerberg int requested_bw, requested_up, requested_down, ret; 19356ce35635SMika Westerberg struct tb_port *in, *out; 19366ce35635SMika Westerberg struct tb_tunnel *tunnel; 19376ce35635SMika Westerberg struct tb *tb = ev->tb; 19386ce35635SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 19396ce35635SMika Westerberg struct tb_switch *sw; 19406ce35635SMika Westerberg 19416ce35635SMika Westerberg pm_runtime_get_sync(&tb->dev); 19426ce35635SMika Westerberg 19436ce35635SMika Westerberg mutex_lock(&tb->lock); 19446ce35635SMika Westerberg if (!tcm->hotplug_active) 19456ce35635SMika Westerberg goto unlock; 19466ce35635SMika Westerberg 19476ce35635SMika Westerberg sw = tb_switch_find_by_route(tb, ev->route); 19486ce35635SMika Westerberg if (!sw) { 19496ce35635SMika Westerberg tb_warn(tb, "bandwidth request from non-existent router %llx\n", 19506ce35635SMika Westerberg ev->route); 19516ce35635SMika Westerberg goto unlock; 19526ce35635SMika Westerberg } 19536ce35635SMika Westerberg 19546ce35635SMika Westerberg in = &sw->ports[ev->port]; 19556ce35635SMika Westerberg if (!tb_port_is_dpin(in)) { 19566ce35635SMika Westerberg tb_port_warn(in, "bandwidth request to non-DP IN adapter\n"); 1957ec4405edSGil Fine goto put_sw; 19586ce35635SMika Westerberg } 19596ce35635SMika Westerberg 19606ce35635SMika Westerberg tb_port_dbg(in, "handling bandwidth allocation request\n"); 19616ce35635SMika Westerberg 19628d73f6b8SMika Westerberg if (!usb4_dp_port_bandwidth_mode_enabled(in)) { 19636ce35635SMika Westerberg tb_port_warn(in, "bandwidth allocation mode not enabled\n"); 1964ec4405edSGil Fine goto put_sw; 19656ce35635SMika Westerberg } 19666ce35635SMika Westerberg 19678d73f6b8SMika Westerberg ret = usb4_dp_port_requested_bandwidth(in); 1968ace75e18SMika Westerberg if (ret < 0) { 1969ace75e18SMika Westerberg if (ret == -ENODATA) 19706ce35635SMika Westerberg tb_port_dbg(in, "no bandwidth request active\n"); 1971ace75e18SMika Westerberg else 1972ace75e18SMika Westerberg tb_port_warn(in, "failed to read requested bandwidth\n"); 1973ec4405edSGil Fine goto put_sw; 19746ce35635SMika Westerberg } 1975ace75e18SMika Westerberg requested_bw = ret; 19766ce35635SMika Westerberg 19776ce35635SMika Westerberg tb_port_dbg(in, "requested bandwidth %d Mb/s\n", requested_bw); 19786ce35635SMika Westerberg 19796ce35635SMika Westerberg tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, NULL); 19806ce35635SMika Westerberg if (!tunnel) { 19816ce35635SMika Westerberg tb_port_warn(in, "failed to find tunnel\n"); 1982ec4405edSGil Fine goto put_sw; 19836ce35635SMika Westerberg } 19846ce35635SMika Westerberg 19856ce35635SMika Westerberg out = tunnel->dst_port; 19866ce35635SMika Westerberg 19876ce35635SMika Westerberg if (in->sw->config.depth < out->sw->config.depth) { 19886ce35635SMika Westerberg requested_up = -1; 19896ce35635SMika Westerberg requested_down = requested_bw; 19906ce35635SMika Westerberg } else { 19916ce35635SMika Westerberg requested_up = requested_bw; 19926ce35635SMika Westerberg requested_down = -1; 19936ce35635SMika Westerberg } 19946ce35635SMika Westerberg 19956ce35635SMika Westerberg ret = tb_alloc_dp_bandwidth(tunnel, &requested_up, &requested_down); 19966ce35635SMika Westerberg if (ret) { 19976ce35635SMika Westerberg if (ret == -ENOBUFS) 19986ce35635SMika Westerberg tb_port_warn(in, "not enough bandwidth available\n"); 19996ce35635SMika Westerberg else 20006ce35635SMika Westerberg tb_port_warn(in, "failed to change bandwidth allocation\n"); 20016ce35635SMika Westerberg } else { 20026ce35635SMika Westerberg tb_port_dbg(in, "bandwidth allocation changed to %d/%d Mb/s\n", 20036ce35635SMika Westerberg requested_up, requested_down); 20046ce35635SMika Westerberg 20056ce35635SMika Westerberg /* Update other clients about the allocation change */ 20066ce35635SMika Westerberg tb_recalc_estimated_bandwidth(tb); 20076ce35635SMika Westerberg } 20086ce35635SMika Westerberg 2009ec4405edSGil Fine put_sw: 2010ec4405edSGil Fine tb_switch_put(sw); 20116ce35635SMika Westerberg unlock: 20126ce35635SMika Westerberg mutex_unlock(&tb->lock); 20136ce35635SMika Westerberg 20146ce35635SMika Westerberg pm_runtime_mark_last_busy(&tb->dev); 20156ce35635SMika Westerberg pm_runtime_put_autosuspend(&tb->dev); 2016596a5123SMika Westerberg 2017596a5123SMika Westerberg kfree(ev); 20186ce35635SMika Westerberg } 20196ce35635SMika Westerberg 20206ce35635SMika Westerberg static void tb_queue_dp_bandwidth_request(struct tb *tb, u64 route, u8 port) 20216ce35635SMika Westerberg { 20226ce35635SMika Westerberg struct tb_hotplug_event *ev; 20236ce35635SMika Westerberg 20246ce35635SMika Westerberg ev = kmalloc(sizeof(*ev), GFP_KERNEL); 20256ce35635SMika Westerberg if (!ev) 20266ce35635SMika Westerberg return; 20276ce35635SMika Westerberg 20286ce35635SMika Westerberg ev->tb = tb; 20296ce35635SMika Westerberg ev->route = route; 20306ce35635SMika Westerberg ev->port = port; 20316ce35635SMika Westerberg INIT_WORK(&ev->work, tb_handle_dp_bandwidth_request); 20326ce35635SMika Westerberg queue_work(tb->wq, &ev->work); 20336ce35635SMika Westerberg } 20346ce35635SMika Westerberg 20356ce35635SMika Westerberg static void tb_handle_notification(struct tb *tb, u64 route, 20366ce35635SMika Westerberg const struct cfg_error_pkg *error) 20376ce35635SMika Westerberg { 20386ce35635SMika Westerberg 20396ce35635SMika Westerberg switch (error->error) { 2040235d0194SMika Westerberg case TB_CFG_ERROR_PCIE_WAKE: 2041235d0194SMika Westerberg case TB_CFG_ERROR_DP_CON_CHANGE: 2042235d0194SMika Westerberg case TB_CFG_ERROR_DPTX_DISCOVERY: 2043235d0194SMika Westerberg if (tb_cfg_ack_notification(tb->ctl, route, error)) 2044235d0194SMika Westerberg tb_warn(tb, "could not ack notification on %llx\n", 2045235d0194SMika Westerberg route); 2046235d0194SMika Westerberg break; 2047235d0194SMika Westerberg 20486ce35635SMika Westerberg case TB_CFG_ERROR_DP_BW: 2049235d0194SMika Westerberg if (tb_cfg_ack_notification(tb->ctl, route, error)) 2050235d0194SMika Westerberg tb_warn(tb, "could not ack notification on %llx\n", 2051235d0194SMika Westerberg route); 20526ce35635SMika Westerberg tb_queue_dp_bandwidth_request(tb, route, error->port); 20536ce35635SMika Westerberg break; 20546ce35635SMika Westerberg 20556ce35635SMika Westerberg default: 2056235d0194SMika Westerberg /* Ignore for now */ 2057235d0194SMika Westerberg break; 20586ce35635SMika Westerberg } 20596ce35635SMika Westerberg } 20606ce35635SMika Westerberg 2061877e50b3SLee Jones /* 2062d6cc51cdSAndreas Noever * tb_schedule_hotplug_handler() - callback function for the control channel 2063d6cc51cdSAndreas Noever * 2064d6cc51cdSAndreas Noever * Delegates to tb_handle_hotplug. 2065d6cc51cdSAndreas Noever */ 206681a54b5eSMika Westerberg static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, 206781a54b5eSMika Westerberg const void *buf, size_t size) 2068d6cc51cdSAndreas Noever { 206981a54b5eSMika Westerberg const struct cfg_event_pkg *pkg = buf; 20706ce35635SMika Westerberg u64 route = tb_cfg_get_route(&pkg->header); 207181a54b5eSMika Westerberg 20726ce35635SMika Westerberg switch (type) { 20736ce35635SMika Westerberg case TB_CFG_PKG_ERROR: 20746ce35635SMika Westerberg tb_handle_notification(tb, route, (const struct cfg_error_pkg *)buf); 20756ce35635SMika Westerberg return; 20766ce35635SMika Westerberg case TB_CFG_PKG_EVENT: 20776ce35635SMika Westerberg break; 20786ce35635SMika Westerberg default: 207981a54b5eSMika Westerberg tb_warn(tb, "unexpected event %#x, ignoring\n", type); 208081a54b5eSMika Westerberg return; 208181a54b5eSMika Westerberg } 208281a54b5eSMika Westerberg 2083210e9f56SMika Westerberg if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { 208481a54b5eSMika Westerberg tb_warn(tb, "could not ack plug event on %llx:%x\n", route, 208581a54b5eSMika Westerberg pkg->port); 208681a54b5eSMika Westerberg } 208781a54b5eSMika Westerberg 20884f807e47SMika Westerberg tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); 2089d6cc51cdSAndreas Noever } 2090d6cc51cdSAndreas Noever 20919d3cce0bSMika Westerberg static void tb_stop(struct tb *tb) 2092d6cc51cdSAndreas Noever { 20939d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 209493f36adeSMika Westerberg struct tb_tunnel *tunnel; 209593f36adeSMika Westerberg struct tb_tunnel *n; 20963364f0c1SAndreas Noever 20976ac6faeeSMika Westerberg cancel_delayed_work(&tcm->remove_work); 20983364f0c1SAndreas Noever /* tunnels are only present after everything has been initialized */ 20997ea4cd6bSMika Westerberg list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 21007ea4cd6bSMika Westerberg /* 21017ea4cd6bSMika Westerberg * DMA tunnels require the driver to be functional so we 21027ea4cd6bSMika Westerberg * tear them down. Other protocol tunnels can be left 21037ea4cd6bSMika Westerberg * intact. 21047ea4cd6bSMika Westerberg */ 21057ea4cd6bSMika Westerberg if (tb_tunnel_is_dma(tunnel)) 21067ea4cd6bSMika Westerberg tb_tunnel_deactivate(tunnel); 210793f36adeSMika Westerberg tb_tunnel_free(tunnel); 21087ea4cd6bSMika Westerberg } 2109bfe778acSMika Westerberg tb_switch_remove(tb->root_switch); 21109d3cce0bSMika Westerberg tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 2111d6cc51cdSAndreas Noever } 2112d6cc51cdSAndreas Noever 211399cabbb0SMika Westerberg static int tb_scan_finalize_switch(struct device *dev, void *data) 211499cabbb0SMika Westerberg { 211599cabbb0SMika Westerberg if (tb_is_switch(dev)) { 211699cabbb0SMika Westerberg struct tb_switch *sw = tb_to_switch(dev); 211799cabbb0SMika Westerberg 211899cabbb0SMika Westerberg /* 211999cabbb0SMika Westerberg * If we found that the switch was already setup by the 212099cabbb0SMika Westerberg * boot firmware, mark it as authorized now before we 212199cabbb0SMika Westerberg * send uevent to userspace. 212299cabbb0SMika Westerberg */ 212399cabbb0SMika Westerberg if (sw->boot) 212499cabbb0SMika Westerberg sw->authorized = 1; 212599cabbb0SMika Westerberg 212699cabbb0SMika Westerberg dev_set_uevent_suppress(dev, false); 212799cabbb0SMika Westerberg kobject_uevent(&dev->kobj, KOBJ_ADD); 212899cabbb0SMika Westerberg device_for_each_child(dev, NULL, tb_scan_finalize_switch); 212999cabbb0SMika Westerberg } 213099cabbb0SMika Westerberg 213199cabbb0SMika Westerberg return 0; 213299cabbb0SMika Westerberg } 213399cabbb0SMika Westerberg 21343c1d704dSSanath S static int tb_start(struct tb *tb, bool reset) 2135d6cc51cdSAndreas Noever { 21369d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 2137bfe778acSMika Westerberg int ret; 2138d6cc51cdSAndreas Noever 2139bfe778acSMika Westerberg tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); 2140444ac384SMika Westerberg if (IS_ERR(tb->root_switch)) 2141444ac384SMika Westerberg return PTR_ERR(tb->root_switch); 2142a25c8b2fSAndreas Noever 2143e6b245ccSMika Westerberg /* 2144e6b245ccSMika Westerberg * ICM firmware upgrade needs running firmware and in native 2145e6b245ccSMika Westerberg * mode that is not available so disable firmware upgrade of the 2146e6b245ccSMika Westerberg * root switch. 21475172eb9aSSzuying Chen * 21485172eb9aSSzuying Chen * However, USB4 routers support NVM firmware upgrade if they 21495172eb9aSSzuying Chen * implement the necessary router operations. 2150e6b245ccSMika Westerberg */ 21515172eb9aSSzuying Chen tb->root_switch->no_nvm_upgrade = !tb_switch_is_usb4(tb->root_switch); 21526ac6faeeSMika Westerberg /* All USB4 routers support runtime PM */ 21536ac6faeeSMika Westerberg tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch); 2154e6b245ccSMika Westerberg 2155bfe778acSMika Westerberg ret = tb_switch_configure(tb->root_switch); 2156bfe778acSMika Westerberg if (ret) { 2157bfe778acSMika Westerberg tb_switch_put(tb->root_switch); 2158bfe778acSMika Westerberg return ret; 2159bfe778acSMika Westerberg } 2160bfe778acSMika Westerberg 2161bfe778acSMika Westerberg /* Announce the switch to the world */ 2162bfe778acSMika Westerberg ret = tb_switch_add(tb->root_switch); 2163bfe778acSMika Westerberg if (ret) { 2164bfe778acSMika Westerberg tb_switch_put(tb->root_switch); 2165bfe778acSMika Westerberg return ret; 2166bfe778acSMika Westerberg } 2167bfe778acSMika Westerberg 2168b017a46dSGil Fine /* 2169b017a46dSGil Fine * To support highest CLx state, we set host router's TMU to 2170b017a46dSGil Fine * Normal mode. 2171b017a46dSGil Fine */ 2172d49b4f04SMika Westerberg tb_switch_tmu_configure(tb->root_switch, TB_SWITCH_TMU_MODE_LOWRES); 2173cf29b9afSRajmohan Mani /* Enable TMU if it is off */ 2174cf29b9afSRajmohan Mani tb_switch_tmu_enable(tb->root_switch); 21753c1d704dSSanath S 21763c1d704dSSanath S /* 21773c1d704dSSanath S * Boot firmware might have created tunnels of its own. Since we 21783c1d704dSSanath S * cannot be sure they are usable for us, tear them down and 21793c1d704dSSanath S * reset the ports to handle it as new hotplug for USB4 v1 21803c1d704dSSanath S * routers (for USB4 v2 and beyond we already do host reset). 21813c1d704dSSanath S */ 21823c1d704dSSanath S if (reset && usb4_switch_version(tb->root_switch) == 1) { 21833c1d704dSSanath S tb_switch_reset(tb->root_switch); 21843c1d704dSSanath S } else { 21859da672a4SAndreas Noever /* Full scan to discover devices added before the driver was loaded. */ 21869da672a4SAndreas Noever tb_scan_switch(tb->root_switch); 21870414bec5SMika Westerberg /* Find out tunnels created by the boot firmware */ 218843bddb26SMika Westerberg tb_discover_tunnels(tb); 2189b60e31bfSSanjay R Mehta /* Add DP resources from the DP tunnels created by the boot firmware */ 2190b60e31bfSSanjay R Mehta tb_discover_dp_resources(tb); 21913c1d704dSSanath S } 21923c1d704dSSanath S 2193e6f81858SRajmohan Mani /* 2194e6f81858SRajmohan Mani * If the boot firmware did not create USB 3.x tunnels create them 2195e6f81858SRajmohan Mani * now for the whole topology. 2196e6f81858SRajmohan Mani */ 2197e6f81858SRajmohan Mani tb_create_usb3_tunnels(tb->root_switch); 21988afe909bSMika Westerberg /* Add DP IN resources for the root switch */ 21998afe909bSMika Westerberg tb_add_dp_resources(tb->root_switch); 220099cabbb0SMika Westerberg /* Make the discovered switches available to the userspace */ 220199cabbb0SMika Westerberg device_for_each_child(&tb->root_switch->dev, NULL, 220299cabbb0SMika Westerberg tb_scan_finalize_switch); 22039da672a4SAndreas Noever 2204d6cc51cdSAndreas Noever /* Allow tb_handle_hotplug to progress events */ 22059d3cce0bSMika Westerberg tcm->hotplug_active = true; 22069d3cce0bSMika Westerberg return 0; 2207d6cc51cdSAndreas Noever } 2208d6cc51cdSAndreas Noever 22099d3cce0bSMika Westerberg static int tb_suspend_noirq(struct tb *tb) 221023dd5bb4SAndreas Noever { 22119d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 22129d3cce0bSMika Westerberg 2213daa5140fSMika Westerberg tb_dbg(tb, "suspending...\n"); 221481a2e3e4SMika Westerberg tb_disconnect_and_release_dp(tb); 22156ac6faeeSMika Westerberg tb_switch_suspend(tb->root_switch, false); 22169d3cce0bSMika Westerberg tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 2217daa5140fSMika Westerberg tb_dbg(tb, "suspend finished\n"); 22189d3cce0bSMika Westerberg 22199d3cce0bSMika Westerberg return 0; 222023dd5bb4SAndreas Noever } 222123dd5bb4SAndreas Noever 222291c0c120SMika Westerberg static void tb_restore_children(struct tb_switch *sw) 222391c0c120SMika Westerberg { 222491c0c120SMika Westerberg struct tb_port *port; 222591c0c120SMika Westerberg 22266ac6faeeSMika Westerberg /* No need to restore if the router is already unplugged */ 22276ac6faeeSMika Westerberg if (sw->is_unplugged) 22286ac6faeeSMika Westerberg return; 22296ac6faeeSMika Westerberg 22301a9b6cb8SMika Westerberg if (tb_enable_clx(sw)) 22311a9b6cb8SMika Westerberg tb_sw_warn(sw, "failed to re-enable CL states\n"); 2232b017a46dSGil Fine 2233cf29b9afSRajmohan Mani if (tb_enable_tmu(sw)) 2234cf29b9afSRajmohan Mani tb_sw_warn(sw, "failed to restore TMU configuration\n"); 2235cf29b9afSRajmohan Mani 2236d49b4f04SMika Westerberg tb_switch_configuration_valid(sw); 2237d49b4f04SMika Westerberg 223891c0c120SMika Westerberg tb_switch_for_each_port(sw, port) { 2239284652a4SMika Westerberg if (!tb_port_has_remote(port) && !port->xdomain) 224091c0c120SMika Westerberg continue; 224191c0c120SMika Westerberg 2242284652a4SMika Westerberg if (port->remote) { 22432ca3263aSMika Westerberg tb_switch_lane_bonding_enable(port->remote->sw); 2244de462039SMika Westerberg tb_switch_configure_link(port->remote->sw); 224591c0c120SMika Westerberg 224691c0c120SMika Westerberg tb_restore_children(port->remote->sw); 2247284652a4SMika Westerberg } else if (port->xdomain) { 2248f9cad07bSMika Westerberg tb_port_configure_xdomain(port, port->xdomain); 2249284652a4SMika Westerberg } 225091c0c120SMika Westerberg } 225191c0c120SMika Westerberg } 225291c0c120SMika Westerberg 22539d3cce0bSMika Westerberg static int tb_resume_noirq(struct tb *tb) 225423dd5bb4SAndreas Noever { 22559d3cce0bSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 225693f36adeSMika Westerberg struct tb_tunnel *tunnel, *n; 225743bddb26SMika Westerberg unsigned int usb3_delay = 0; 225843bddb26SMika Westerberg LIST_HEAD(tunnels); 22599d3cce0bSMika Westerberg 2260daa5140fSMika Westerberg tb_dbg(tb, "resuming...\n"); 226123dd5bb4SAndreas Noever 226223dd5bb4SAndreas Noever /* remove any pci devices the firmware might have setup */ 2263356b6c4eSMika Westerberg tb_switch_reset(tb->root_switch); 226423dd5bb4SAndreas Noever 226523dd5bb4SAndreas Noever tb_switch_resume(tb->root_switch); 226623dd5bb4SAndreas Noever tb_free_invalid_tunnels(tb); 226723dd5bb4SAndreas Noever tb_free_unplugged_children(tb->root_switch); 226891c0c120SMika Westerberg tb_restore_children(tb->root_switch); 226943bddb26SMika Westerberg 227043bddb26SMika Westerberg /* 227143bddb26SMika Westerberg * If we get here from suspend to disk the boot firmware or the 227243bddb26SMika Westerberg * restore kernel might have created tunnels of its own. Since 227343bddb26SMika Westerberg * we cannot be sure they are usable for us we find and tear 227443bddb26SMika Westerberg * them down. 227543bddb26SMika Westerberg */ 227643bddb26SMika Westerberg tb_switch_discover_tunnels(tb->root_switch, &tunnels, false); 227743bddb26SMika Westerberg list_for_each_entry_safe_reverse(tunnel, n, &tunnels, list) { 227843bddb26SMika Westerberg if (tb_tunnel_is_usb3(tunnel)) 227943bddb26SMika Westerberg usb3_delay = 500; 228043bddb26SMika Westerberg tb_tunnel_deactivate(tunnel); 228143bddb26SMika Westerberg tb_tunnel_free(tunnel); 228243bddb26SMika Westerberg } 228343bddb26SMika Westerberg 228443bddb26SMika Westerberg /* Re-create our tunnels now */ 228543bddb26SMika Westerberg list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 228643bddb26SMika Westerberg /* USB3 requires delay before it can be re-activated */ 228743bddb26SMika Westerberg if (tb_tunnel_is_usb3(tunnel)) { 228843bddb26SMika Westerberg msleep(usb3_delay); 228943bddb26SMika Westerberg /* Only need to do it once */ 229043bddb26SMika Westerberg usb3_delay = 0; 229143bddb26SMika Westerberg } 229293f36adeSMika Westerberg tb_tunnel_restart(tunnel); 229343bddb26SMika Westerberg } 22949d3cce0bSMika Westerberg if (!list_empty(&tcm->tunnel_list)) { 229523dd5bb4SAndreas Noever /* 229623dd5bb4SAndreas Noever * the pcie links need some time to get going. 229723dd5bb4SAndreas Noever * 100ms works for me... 229823dd5bb4SAndreas Noever */ 2299daa5140fSMika Westerberg tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); 230023dd5bb4SAndreas Noever msleep(100); 230123dd5bb4SAndreas Noever } 230223dd5bb4SAndreas Noever /* Allow tb_handle_hotplug to progress events */ 23039d3cce0bSMika Westerberg tcm->hotplug_active = true; 2304daa5140fSMika Westerberg tb_dbg(tb, "resume finished\n"); 23059d3cce0bSMika Westerberg 23069d3cce0bSMika Westerberg return 0; 23079d3cce0bSMika Westerberg } 23089d3cce0bSMika Westerberg 23097ea4cd6bSMika Westerberg static int tb_free_unplugged_xdomains(struct tb_switch *sw) 23107ea4cd6bSMika Westerberg { 2311b433d010SMika Westerberg struct tb_port *port; 2312b433d010SMika Westerberg int ret = 0; 23137ea4cd6bSMika Westerberg 2314b433d010SMika Westerberg tb_switch_for_each_port(sw, port) { 23157ea4cd6bSMika Westerberg if (tb_is_upstream_port(port)) 23167ea4cd6bSMika Westerberg continue; 23177ea4cd6bSMika Westerberg if (port->xdomain && port->xdomain->is_unplugged) { 2318dacb1287SKranthi Kuntala tb_retimer_remove_all(port); 23197ea4cd6bSMika Westerberg tb_xdomain_remove(port->xdomain); 2320284652a4SMika Westerberg tb_port_unconfigure_xdomain(port); 23217ea4cd6bSMika Westerberg port->xdomain = NULL; 23227ea4cd6bSMika Westerberg ret++; 23237ea4cd6bSMika Westerberg } else if (port->remote) { 23247ea4cd6bSMika Westerberg ret += tb_free_unplugged_xdomains(port->remote->sw); 23257ea4cd6bSMika Westerberg } 23267ea4cd6bSMika Westerberg } 23277ea4cd6bSMika Westerberg 23287ea4cd6bSMika Westerberg return ret; 23297ea4cd6bSMika Westerberg } 23307ea4cd6bSMika Westerberg 2331884e4d57SMika Westerberg static int tb_freeze_noirq(struct tb *tb) 2332884e4d57SMika Westerberg { 2333884e4d57SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 2334884e4d57SMika Westerberg 2335884e4d57SMika Westerberg tcm->hotplug_active = false; 2336884e4d57SMika Westerberg return 0; 2337884e4d57SMika Westerberg } 2338884e4d57SMika Westerberg 2339884e4d57SMika Westerberg static int tb_thaw_noirq(struct tb *tb) 2340884e4d57SMika Westerberg { 2341884e4d57SMika Westerberg struct tb_cm *tcm = tb_priv(tb); 2342884e4d57SMika Westerberg 2343884e4d57SMika Westerberg tcm->hotplug_active = true; 2344884e4d57SMika Westerberg return 0; 2345884e4d57SMika Westerberg } 2346884e4d57SMika Westerberg 23477ea4cd6bSMika Westerberg static void tb_complete(struct tb *tb) 23487ea4cd6bSMika Westerberg { 23497ea4cd6bSMika Westerberg /* 23507ea4cd6bSMika Westerberg * Release any unplugged XDomains and if there is a case where 23517ea4cd6bSMika Westerberg * another domain is swapped in place of unplugged XDomain we 23527ea4cd6bSMika Westerberg * need to run another rescan. 23537ea4cd6bSMika Westerberg */ 23547ea4cd6bSMika Westerberg mutex_lock(&tb->lock); 23557ea4cd6bSMika Westerberg if (tb_free_unplugged_xdomains(tb->root_switch)) 23567ea4cd6bSMika Westerberg tb_scan_switch(tb->root_switch); 23577ea4cd6bSMika Westerberg mutex_unlock(&tb->lock); 23587ea4cd6bSMika Westerberg } 23597ea4cd6bSMika Westerberg 23606ac6faeeSMika Westerberg static int tb_runtime_suspend(struct tb *tb) 23616ac6faeeSMika Westerberg { 23626ac6faeeSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 23636ac6faeeSMika Westerberg 23646ac6faeeSMika Westerberg mutex_lock(&tb->lock); 23656ac6faeeSMika Westerberg tb_switch_suspend(tb->root_switch, true); 23666ac6faeeSMika Westerberg tcm->hotplug_active = false; 23676ac6faeeSMika Westerberg mutex_unlock(&tb->lock); 23686ac6faeeSMika Westerberg 23696ac6faeeSMika Westerberg return 0; 23706ac6faeeSMika Westerberg } 23716ac6faeeSMika Westerberg 23726ac6faeeSMika Westerberg static void tb_remove_work(struct work_struct *work) 23736ac6faeeSMika Westerberg { 23746ac6faeeSMika Westerberg struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work); 23756ac6faeeSMika Westerberg struct tb *tb = tcm_to_tb(tcm); 23766ac6faeeSMika Westerberg 23776ac6faeeSMika Westerberg mutex_lock(&tb->lock); 23786ac6faeeSMika Westerberg if (tb->root_switch) { 23796ac6faeeSMika Westerberg tb_free_unplugged_children(tb->root_switch); 23806ac6faeeSMika Westerberg tb_free_unplugged_xdomains(tb->root_switch); 23816ac6faeeSMika Westerberg } 23826ac6faeeSMika Westerberg mutex_unlock(&tb->lock); 23836ac6faeeSMika Westerberg } 23846ac6faeeSMika Westerberg 23856ac6faeeSMika Westerberg static int tb_runtime_resume(struct tb *tb) 23866ac6faeeSMika Westerberg { 23876ac6faeeSMika Westerberg struct tb_cm *tcm = tb_priv(tb); 23886ac6faeeSMika Westerberg struct tb_tunnel *tunnel, *n; 23896ac6faeeSMika Westerberg 23906ac6faeeSMika Westerberg mutex_lock(&tb->lock); 23916ac6faeeSMika Westerberg tb_switch_resume(tb->root_switch); 23926ac6faeeSMika Westerberg tb_free_invalid_tunnels(tb); 23936ac6faeeSMika Westerberg tb_restore_children(tb->root_switch); 23946ac6faeeSMika Westerberg list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 23956ac6faeeSMika Westerberg tb_tunnel_restart(tunnel); 23966ac6faeeSMika Westerberg tcm->hotplug_active = true; 23976ac6faeeSMika Westerberg mutex_unlock(&tb->lock); 23986ac6faeeSMika Westerberg 23996ac6faeeSMika Westerberg /* 24006ac6faeeSMika Westerberg * Schedule cleanup of any unplugged devices. Run this in a 24016ac6faeeSMika Westerberg * separate thread to avoid possible deadlock if the device 24026ac6faeeSMika Westerberg * removal runtime resumes the unplugged device. 24036ac6faeeSMika Westerberg */ 24046ac6faeeSMika Westerberg queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50)); 24056ac6faeeSMika Westerberg return 0; 24066ac6faeeSMika Westerberg } 24076ac6faeeSMika Westerberg 24089d3cce0bSMika Westerberg static const struct tb_cm_ops tb_cm_ops = { 24099d3cce0bSMika Westerberg .start = tb_start, 24109d3cce0bSMika Westerberg .stop = tb_stop, 24119d3cce0bSMika Westerberg .suspend_noirq = tb_suspend_noirq, 24129d3cce0bSMika Westerberg .resume_noirq = tb_resume_noirq, 2413884e4d57SMika Westerberg .freeze_noirq = tb_freeze_noirq, 2414884e4d57SMika Westerberg .thaw_noirq = tb_thaw_noirq, 24157ea4cd6bSMika Westerberg .complete = tb_complete, 24166ac6faeeSMika Westerberg .runtime_suspend = tb_runtime_suspend, 24176ac6faeeSMika Westerberg .runtime_resume = tb_runtime_resume, 241881a54b5eSMika Westerberg .handle_event = tb_handle_event, 24193da88be2SMika Westerberg .disapprove_switch = tb_disconnect_pci, 242099cabbb0SMika Westerberg .approve_switch = tb_tunnel_pci, 24217ea4cd6bSMika Westerberg .approve_xdomain_paths = tb_approve_xdomain_paths, 24227ea4cd6bSMika Westerberg .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, 24239d3cce0bSMika Westerberg }; 24249d3cce0bSMika Westerberg 2425349bfe08SMika Westerberg /* 2426349bfe08SMika Westerberg * During suspend the Thunderbolt controller is reset and all PCIe 2427349bfe08SMika Westerberg * tunnels are lost. The NHI driver will try to reestablish all tunnels 2428349bfe08SMika Westerberg * during resume. This adds device links between the tunneled PCIe 2429349bfe08SMika Westerberg * downstream ports and the NHI so that the device core will make sure 2430349bfe08SMika Westerberg * NHI is resumed first before the rest. 2431349bfe08SMika Westerberg */ 2432408e1d96SMika Westerberg static bool tb_apple_add_links(struct tb_nhi *nhi) 2433349bfe08SMika Westerberg { 2434349bfe08SMika Westerberg struct pci_dev *upstream, *pdev; 2435408e1d96SMika Westerberg bool ret; 2436349bfe08SMika Westerberg 2437349bfe08SMika Westerberg if (!x86_apple_machine) 2438408e1d96SMika Westerberg return false; 2439349bfe08SMika Westerberg 2440349bfe08SMika Westerberg switch (nhi->pdev->device) { 2441349bfe08SMika Westerberg case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: 2442349bfe08SMika Westerberg case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: 2443349bfe08SMika Westerberg case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: 2444349bfe08SMika Westerberg case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: 2445349bfe08SMika Westerberg break; 2446349bfe08SMika Westerberg default: 2447408e1d96SMika Westerberg return false; 2448349bfe08SMika Westerberg } 2449349bfe08SMika Westerberg 2450349bfe08SMika Westerberg upstream = pci_upstream_bridge(nhi->pdev); 2451349bfe08SMika Westerberg while (upstream) { 2452349bfe08SMika Westerberg if (!pci_is_pcie(upstream)) 2453408e1d96SMika Westerberg return false; 2454349bfe08SMika Westerberg if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM) 2455349bfe08SMika Westerberg break; 2456349bfe08SMika Westerberg upstream = pci_upstream_bridge(upstream); 2457349bfe08SMika Westerberg } 2458349bfe08SMika Westerberg 2459349bfe08SMika Westerberg if (!upstream) 2460408e1d96SMika Westerberg return false; 2461349bfe08SMika Westerberg 2462349bfe08SMika Westerberg /* 2463349bfe08SMika Westerberg * For each hotplug downstream port, create add device link 2464349bfe08SMika Westerberg * back to NHI so that PCIe tunnels can be re-established after 2465349bfe08SMika Westerberg * sleep. 2466349bfe08SMika Westerberg */ 2467408e1d96SMika Westerberg ret = false; 2468349bfe08SMika Westerberg for_each_pci_bridge(pdev, upstream->subordinate) { 2469349bfe08SMika Westerberg const struct device_link *link; 2470349bfe08SMika Westerberg 2471349bfe08SMika Westerberg if (!pci_is_pcie(pdev)) 2472349bfe08SMika Westerberg continue; 2473349bfe08SMika Westerberg if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM || 2474349bfe08SMika Westerberg !pdev->is_hotplug_bridge) 2475349bfe08SMika Westerberg continue; 2476349bfe08SMika Westerberg 2477349bfe08SMika Westerberg link = device_link_add(&pdev->dev, &nhi->pdev->dev, 2478349bfe08SMika Westerberg DL_FLAG_AUTOREMOVE_SUPPLIER | 2479349bfe08SMika Westerberg DL_FLAG_PM_RUNTIME); 2480349bfe08SMika Westerberg if (link) { 2481349bfe08SMika Westerberg dev_dbg(&nhi->pdev->dev, "created link from %s\n", 2482349bfe08SMika Westerberg dev_name(&pdev->dev)); 2483408e1d96SMika Westerberg ret = true; 2484349bfe08SMika Westerberg } else { 2485349bfe08SMika Westerberg dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", 2486349bfe08SMika Westerberg dev_name(&pdev->dev)); 2487349bfe08SMika Westerberg } 2488349bfe08SMika Westerberg } 2489408e1d96SMika Westerberg 2490408e1d96SMika Westerberg return ret; 2491349bfe08SMika Westerberg } 2492349bfe08SMika Westerberg 24939d3cce0bSMika Westerberg struct tb *tb_probe(struct tb_nhi *nhi) 24949d3cce0bSMika Westerberg { 24959d3cce0bSMika Westerberg struct tb_cm *tcm; 24969d3cce0bSMika Westerberg struct tb *tb; 24979d3cce0bSMika Westerberg 24987f0a34d7SMika Westerberg tb = tb_domain_alloc(nhi, TB_TIMEOUT, sizeof(*tcm)); 24999d3cce0bSMika Westerberg if (!tb) 25009d3cce0bSMika Westerberg return NULL; 25019d3cce0bSMika Westerberg 2502c6da62a2SMika Westerberg if (tb_acpi_may_tunnel_pcie()) 250399cabbb0SMika Westerberg tb->security_level = TB_SECURITY_USER; 2504c6da62a2SMika Westerberg else 2505c6da62a2SMika Westerberg tb->security_level = TB_SECURITY_NOPCIE; 2506c6da62a2SMika Westerberg 25079d3cce0bSMika Westerberg tb->cm_ops = &tb_cm_ops; 25089d3cce0bSMika Westerberg 25099d3cce0bSMika Westerberg tcm = tb_priv(tb); 25109d3cce0bSMika Westerberg INIT_LIST_HEAD(&tcm->tunnel_list); 25118afe909bSMika Westerberg INIT_LIST_HEAD(&tcm->dp_resources); 25126ac6faeeSMika Westerberg INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work); 25136ce35635SMika Westerberg tb_init_bandwidth_groups(tcm); 25149d3cce0bSMika Westerberg 2515e0258805SMika Westerberg tb_dbg(tb, "using software connection manager\n"); 2516e0258805SMika Westerberg 2517408e1d96SMika Westerberg /* 2518408e1d96SMika Westerberg * Device links are needed to make sure we establish tunnels 2519408e1d96SMika Westerberg * before the PCIe/USB stack is resumed so complain here if we 2520408e1d96SMika Westerberg * found them missing. 2521408e1d96SMika Westerberg */ 2522408e1d96SMika Westerberg if (!tb_apple_add_links(nhi) && !tb_acpi_add_links(nhi)) 2523408e1d96SMika Westerberg tb_warn(tb, "device links to tunneled native ports are missing!\n"); 2524349bfe08SMika Westerberg 25259d3cce0bSMika Westerberg return tb; 252623dd5bb4SAndreas Noever } 2527