1d6cc51cdSAndreas Noever /* 2d6cc51cdSAndreas Noever * Thunderbolt Cactus Ridge driver - bus logic (NHI independent) 3d6cc51cdSAndreas Noever * 4d6cc51cdSAndreas Noever * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> 5d6cc51cdSAndreas Noever */ 6d6cc51cdSAndreas Noever 7d6cc51cdSAndreas Noever #include <linux/slab.h> 8d6cc51cdSAndreas Noever #include <linux/errno.h> 9d6cc51cdSAndreas Noever #include <linux/delay.h> 10d6cc51cdSAndreas Noever 11d6cc51cdSAndreas Noever #include "tb.h" 127adf6097SAndreas Noever #include "tb_regs.h" 133364f0c1SAndreas Noever #include "tunnel_pci.h" 14d6cc51cdSAndreas Noever 159da672a4SAndreas Noever 169da672a4SAndreas Noever /* enumeration & hot plug handling */ 179da672a4SAndreas Noever 189da672a4SAndreas Noever 199da672a4SAndreas Noever static void tb_scan_port(struct tb_port *port); 209da672a4SAndreas Noever 219da672a4SAndreas Noever /** 229da672a4SAndreas Noever * tb_scan_switch() - scan for and initialize downstream switches 239da672a4SAndreas Noever */ 249da672a4SAndreas Noever static void tb_scan_switch(struct tb_switch *sw) 259da672a4SAndreas Noever { 269da672a4SAndreas Noever int i; 279da672a4SAndreas Noever for (i = 1; i <= sw->config.max_port_number; i++) 289da672a4SAndreas Noever tb_scan_port(&sw->ports[i]); 299da672a4SAndreas Noever } 309da672a4SAndreas Noever 319da672a4SAndreas Noever /** 329da672a4SAndreas Noever * tb_scan_port() - check for and initialize switches below port 339da672a4SAndreas Noever */ 349da672a4SAndreas Noever static void tb_scan_port(struct tb_port *port) 359da672a4SAndreas Noever { 369da672a4SAndreas Noever struct tb_switch *sw; 379da672a4SAndreas Noever if (tb_is_upstream_port(port)) 389da672a4SAndreas Noever return; 399da672a4SAndreas Noever if (port->config.type != TB_TYPE_PORT) 409da672a4SAndreas Noever return; 419da672a4SAndreas Noever if (tb_wait_for_port(port, false) <= 0) 429da672a4SAndreas Noever return; 439da672a4SAndreas Noever if (port->remote) { 449da672a4SAndreas Noever tb_port_WARN(port, "port already has a remote!\n"); 459da672a4SAndreas Noever return; 469da672a4SAndreas Noever } 479da672a4SAndreas Noever sw = tb_switch_alloc(port->sw->tb, tb_downstream_route(port)); 489da672a4SAndreas Noever if (!sw) 499da672a4SAndreas Noever return; 509da672a4SAndreas Noever port->remote = tb_upstream_port(sw); 519da672a4SAndreas Noever tb_upstream_port(sw)->remote = port; 529da672a4SAndreas Noever tb_scan_switch(sw); 539da672a4SAndreas Noever } 549da672a4SAndreas Noever 553364f0c1SAndreas Noever /** 563364f0c1SAndreas Noever * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away 573364f0c1SAndreas Noever */ 583364f0c1SAndreas Noever static void tb_free_invalid_tunnels(struct tb *tb) 593364f0c1SAndreas Noever { 603364f0c1SAndreas Noever struct tb_pci_tunnel *tunnel; 613364f0c1SAndreas Noever struct tb_pci_tunnel *n; 623364f0c1SAndreas Noever list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) 633364f0c1SAndreas Noever { 643364f0c1SAndreas Noever if (tb_pci_is_invalid(tunnel)) { 653364f0c1SAndreas Noever tb_pci_deactivate(tunnel); 663364f0c1SAndreas Noever tb_pci_free(tunnel); 673364f0c1SAndreas Noever } 683364f0c1SAndreas Noever } 693364f0c1SAndreas Noever } 703364f0c1SAndreas Noever 713364f0c1SAndreas Noever /** 7223dd5bb4SAndreas Noever * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches 7323dd5bb4SAndreas Noever */ 7423dd5bb4SAndreas Noever static void tb_free_unplugged_children(struct tb_switch *sw) 7523dd5bb4SAndreas Noever { 7623dd5bb4SAndreas Noever int i; 7723dd5bb4SAndreas Noever for (i = 1; i <= sw->config.max_port_number; i++) { 7823dd5bb4SAndreas Noever struct tb_port *port = &sw->ports[i]; 7923dd5bb4SAndreas Noever if (tb_is_upstream_port(port)) 8023dd5bb4SAndreas Noever continue; 8123dd5bb4SAndreas Noever if (!port->remote) 8223dd5bb4SAndreas Noever continue; 8323dd5bb4SAndreas Noever if (port->remote->sw->is_unplugged) { 8423dd5bb4SAndreas Noever tb_switch_free(port->remote->sw); 8523dd5bb4SAndreas Noever port->remote = NULL; 8623dd5bb4SAndreas Noever } else { 8723dd5bb4SAndreas Noever tb_free_unplugged_children(port->remote->sw); 8823dd5bb4SAndreas Noever } 8923dd5bb4SAndreas Noever } 9023dd5bb4SAndreas Noever } 9123dd5bb4SAndreas Noever 9223dd5bb4SAndreas Noever 9323dd5bb4SAndreas Noever /** 943364f0c1SAndreas Noever * find_pci_up_port() - return the first PCIe up port on @sw or NULL 953364f0c1SAndreas Noever */ 963364f0c1SAndreas Noever static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw) 973364f0c1SAndreas Noever { 983364f0c1SAndreas Noever int i; 993364f0c1SAndreas Noever for (i = 1; i <= sw->config.max_port_number; i++) 1003364f0c1SAndreas Noever if (sw->ports[i].config.type == TB_TYPE_PCIE_UP) 1013364f0c1SAndreas Noever return &sw->ports[i]; 1023364f0c1SAndreas Noever return NULL; 1033364f0c1SAndreas Noever } 1043364f0c1SAndreas Noever 1053364f0c1SAndreas Noever /** 1063364f0c1SAndreas Noever * find_unused_down_port() - return the first inactive PCIe down port on @sw 1073364f0c1SAndreas Noever */ 1083364f0c1SAndreas Noever static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw) 1093364f0c1SAndreas Noever { 1103364f0c1SAndreas Noever int i; 1113364f0c1SAndreas Noever int cap; 1123364f0c1SAndreas Noever int res; 1133364f0c1SAndreas Noever int data; 1143364f0c1SAndreas Noever for (i = 1; i <= sw->config.max_port_number; i++) { 1153364f0c1SAndreas Noever if (tb_is_upstream_port(&sw->ports[i])) 1163364f0c1SAndreas Noever continue; 1173364f0c1SAndreas Noever if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN) 1183364f0c1SAndreas Noever continue; 1193364f0c1SAndreas Noever cap = tb_find_cap(&sw->ports[i], TB_CFG_PORT, TB_CAP_PCIE); 1203364f0c1SAndreas Noever if (cap <= 0) 1213364f0c1SAndreas Noever continue; 1223364f0c1SAndreas Noever res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1); 1233364f0c1SAndreas Noever if (res < 0) 1243364f0c1SAndreas Noever continue; 1253364f0c1SAndreas Noever if (data & 0x80000000) 1263364f0c1SAndreas Noever continue; 1273364f0c1SAndreas Noever return &sw->ports[i]; 1283364f0c1SAndreas Noever } 1293364f0c1SAndreas Noever return NULL; 1303364f0c1SAndreas Noever } 1313364f0c1SAndreas Noever 1323364f0c1SAndreas Noever /** 1333364f0c1SAndreas Noever * tb_activate_pcie_devices() - scan for and activate PCIe devices 1343364f0c1SAndreas Noever * 1353364f0c1SAndreas Noever * This method is somewhat ad hoc. For now it only supports one device 1363364f0c1SAndreas Noever * per port and only devices at depth 1. 1373364f0c1SAndreas Noever */ 1383364f0c1SAndreas Noever static void tb_activate_pcie_devices(struct tb *tb) 1393364f0c1SAndreas Noever { 1403364f0c1SAndreas Noever int i; 1413364f0c1SAndreas Noever int cap; 1423364f0c1SAndreas Noever u32 data; 1433364f0c1SAndreas Noever struct tb_switch *sw; 1443364f0c1SAndreas Noever struct tb_port *up_port; 1453364f0c1SAndreas Noever struct tb_port *down_port; 1463364f0c1SAndreas Noever struct tb_pci_tunnel *tunnel; 1473364f0c1SAndreas Noever /* scan for pcie devices at depth 1*/ 1483364f0c1SAndreas Noever for (i = 1; i <= tb->root_switch->config.max_port_number; i++) { 1493364f0c1SAndreas Noever if (tb_is_upstream_port(&tb->root_switch->ports[i])) 1503364f0c1SAndreas Noever continue; 1513364f0c1SAndreas Noever if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT) 1523364f0c1SAndreas Noever continue; 1533364f0c1SAndreas Noever if (!tb->root_switch->ports[i].remote) 1543364f0c1SAndreas Noever continue; 1553364f0c1SAndreas Noever sw = tb->root_switch->ports[i].remote->sw; 1563364f0c1SAndreas Noever up_port = tb_find_pci_up_port(sw); 1573364f0c1SAndreas Noever if (!up_port) { 1583364f0c1SAndreas Noever tb_sw_info(sw, "no PCIe devices found, aborting\n"); 1593364f0c1SAndreas Noever continue; 1603364f0c1SAndreas Noever } 1613364f0c1SAndreas Noever 1623364f0c1SAndreas Noever /* check whether port is already activated */ 1633364f0c1SAndreas Noever cap = tb_find_cap(up_port, TB_CFG_PORT, TB_CAP_PCIE); 1643364f0c1SAndreas Noever if (cap <= 0) 1653364f0c1SAndreas Noever continue; 1663364f0c1SAndreas Noever if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1)) 1673364f0c1SAndreas Noever continue; 1683364f0c1SAndreas Noever if (data & 0x80000000) { 1693364f0c1SAndreas Noever tb_port_info(up_port, 1703364f0c1SAndreas Noever "PCIe port already activated, aborting\n"); 1713364f0c1SAndreas Noever continue; 1723364f0c1SAndreas Noever } 1733364f0c1SAndreas Noever 1743364f0c1SAndreas Noever down_port = tb_find_unused_down_port(tb->root_switch); 1753364f0c1SAndreas Noever if (!down_port) { 1763364f0c1SAndreas Noever tb_port_info(up_port, 1773364f0c1SAndreas Noever "All PCIe down ports are occupied, aborting\n"); 1783364f0c1SAndreas Noever continue; 1793364f0c1SAndreas Noever } 1803364f0c1SAndreas Noever tunnel = tb_pci_alloc(tb, up_port, down_port); 1813364f0c1SAndreas Noever if (!tunnel) { 1823364f0c1SAndreas Noever tb_port_info(up_port, 1833364f0c1SAndreas Noever "PCIe tunnel allocation failed, aborting\n"); 1843364f0c1SAndreas Noever continue; 1853364f0c1SAndreas Noever } 1863364f0c1SAndreas Noever 1873364f0c1SAndreas Noever if (tb_pci_activate(tunnel)) { 1883364f0c1SAndreas Noever tb_port_info(up_port, 1893364f0c1SAndreas Noever "PCIe tunnel activation failed, aborting\n"); 1903364f0c1SAndreas Noever tb_pci_free(tunnel); 1913364f0c1SAndreas Noever } 1923364f0c1SAndreas Noever 1933364f0c1SAndreas Noever } 1943364f0c1SAndreas Noever } 1959da672a4SAndreas Noever 196d6cc51cdSAndreas Noever /* hotplug handling */ 197d6cc51cdSAndreas Noever 198d6cc51cdSAndreas Noever struct tb_hotplug_event { 199d6cc51cdSAndreas Noever struct work_struct work; 200d6cc51cdSAndreas Noever struct tb *tb; 201d6cc51cdSAndreas Noever u64 route; 202d6cc51cdSAndreas Noever u8 port; 203d6cc51cdSAndreas Noever bool unplug; 204d6cc51cdSAndreas Noever }; 205d6cc51cdSAndreas Noever 206d6cc51cdSAndreas Noever /** 207d6cc51cdSAndreas Noever * tb_handle_hotplug() - handle hotplug event 208d6cc51cdSAndreas Noever * 209d6cc51cdSAndreas Noever * Executes on tb->wq. 210d6cc51cdSAndreas Noever */ 211d6cc51cdSAndreas Noever static void tb_handle_hotplug(struct work_struct *work) 212d6cc51cdSAndreas Noever { 213d6cc51cdSAndreas Noever struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 214d6cc51cdSAndreas Noever struct tb *tb = ev->tb; 215053596d9SAndreas Noever struct tb_switch *sw; 216053596d9SAndreas Noever struct tb_port *port; 217d6cc51cdSAndreas Noever mutex_lock(&tb->lock); 218d6cc51cdSAndreas Noever if (!tb->hotplug_active) 219d6cc51cdSAndreas Noever goto out; /* during init, suspend or shutdown */ 220d6cc51cdSAndreas Noever 221053596d9SAndreas Noever sw = get_switch_at_route(tb->root_switch, ev->route); 222053596d9SAndreas Noever if (!sw) { 223053596d9SAndreas Noever tb_warn(tb, 224053596d9SAndreas Noever "hotplug event from non existent switch %llx:%x (unplug: %d)\n", 225053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 226053596d9SAndreas Noever goto out; 227053596d9SAndreas Noever } 228053596d9SAndreas Noever if (ev->port > sw->config.max_port_number) { 229053596d9SAndreas Noever tb_warn(tb, 230053596d9SAndreas Noever "hotplug event from non existent port %llx:%x (unplug: %d)\n", 231053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 232053596d9SAndreas Noever goto out; 233053596d9SAndreas Noever } 234053596d9SAndreas Noever port = &sw->ports[ev->port]; 235053596d9SAndreas Noever if (tb_is_upstream_port(port)) { 236053596d9SAndreas Noever tb_warn(tb, 237053596d9SAndreas Noever "hotplug event for upstream port %llx:%x (unplug: %d)\n", 238053596d9SAndreas Noever ev->route, ev->port, ev->unplug); 239053596d9SAndreas Noever goto out; 240053596d9SAndreas Noever } 241053596d9SAndreas Noever if (ev->unplug) { 242053596d9SAndreas Noever if (port->remote) { 243053596d9SAndreas Noever tb_port_info(port, "unplugged\n"); 244053596d9SAndreas Noever tb_sw_set_unpplugged(port->remote->sw); 2453364f0c1SAndreas Noever tb_free_invalid_tunnels(tb); 246053596d9SAndreas Noever tb_switch_free(port->remote->sw); 247053596d9SAndreas Noever port->remote = NULL; 248053596d9SAndreas Noever } else { 249053596d9SAndreas Noever tb_port_info(port, 250053596d9SAndreas Noever "got unplug event for disconnected port, ignoring\n"); 251053596d9SAndreas Noever } 252053596d9SAndreas Noever } else if (port->remote) { 253053596d9SAndreas Noever tb_port_info(port, 254053596d9SAndreas Noever "got plug event for connected port, ignoring\n"); 255053596d9SAndreas Noever } else { 256053596d9SAndreas Noever tb_port_info(port, "hotplug: scanning\n"); 257053596d9SAndreas Noever tb_scan_port(port); 258053596d9SAndreas Noever if (!port->remote) { 259053596d9SAndreas Noever tb_port_info(port, "hotplug: no switch found\n"); 260053596d9SAndreas Noever } else if (port->remote->sw->config.depth > 1) { 261053596d9SAndreas Noever tb_sw_warn(port->remote->sw, 262053596d9SAndreas Noever "hotplug: chaining not supported\n"); 2633364f0c1SAndreas Noever } else { 2643364f0c1SAndreas Noever tb_sw_info(port->remote->sw, 2653364f0c1SAndreas Noever "hotplug: activating pcie devices\n"); 2663364f0c1SAndreas Noever tb_activate_pcie_devices(tb); 267053596d9SAndreas Noever } 268053596d9SAndreas Noever } 269d6cc51cdSAndreas Noever out: 270d6cc51cdSAndreas Noever mutex_unlock(&tb->lock); 271d6cc51cdSAndreas Noever kfree(ev); 272d6cc51cdSAndreas Noever } 273d6cc51cdSAndreas Noever 274d6cc51cdSAndreas Noever /** 275d6cc51cdSAndreas Noever * tb_schedule_hotplug_handler() - callback function for the control channel 276d6cc51cdSAndreas Noever * 277d6cc51cdSAndreas Noever * Delegates to tb_handle_hotplug. 278d6cc51cdSAndreas Noever */ 279d6cc51cdSAndreas Noever static void tb_schedule_hotplug_handler(void *data, u64 route, u8 port, 280d6cc51cdSAndreas Noever bool unplug) 281d6cc51cdSAndreas Noever { 282d6cc51cdSAndreas Noever struct tb *tb = data; 283d6cc51cdSAndreas Noever struct tb_hotplug_event *ev = kmalloc(sizeof(*ev), GFP_KERNEL); 284d6cc51cdSAndreas Noever if (!ev) 285d6cc51cdSAndreas Noever return; 286d6cc51cdSAndreas Noever INIT_WORK(&ev->work, tb_handle_hotplug); 287d6cc51cdSAndreas Noever ev->tb = tb; 288d6cc51cdSAndreas Noever ev->route = route; 289d6cc51cdSAndreas Noever ev->port = port; 290d6cc51cdSAndreas Noever ev->unplug = unplug; 291d6cc51cdSAndreas Noever queue_work(tb->wq, &ev->work); 292d6cc51cdSAndreas Noever } 293d6cc51cdSAndreas Noever 294d6cc51cdSAndreas Noever /** 295d6cc51cdSAndreas Noever * thunderbolt_shutdown_and_free() - shutdown everything 296d6cc51cdSAndreas Noever * 297d6cc51cdSAndreas Noever * Free all switches and the config channel. 298d6cc51cdSAndreas Noever * 299d6cc51cdSAndreas Noever * Used in the error path of thunderbolt_alloc_and_start. 300d6cc51cdSAndreas Noever */ 301d6cc51cdSAndreas Noever void thunderbolt_shutdown_and_free(struct tb *tb) 302d6cc51cdSAndreas Noever { 3033364f0c1SAndreas Noever struct tb_pci_tunnel *tunnel; 3043364f0c1SAndreas Noever struct tb_pci_tunnel *n; 3053364f0c1SAndreas Noever 306d6cc51cdSAndreas Noever mutex_lock(&tb->lock); 307d6cc51cdSAndreas Noever 3083364f0c1SAndreas Noever /* tunnels are only present after everything has been initialized */ 3093364f0c1SAndreas Noever list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) { 3103364f0c1SAndreas Noever tb_pci_deactivate(tunnel); 3113364f0c1SAndreas Noever tb_pci_free(tunnel); 3123364f0c1SAndreas Noever } 3133364f0c1SAndreas Noever 314a25c8b2fSAndreas Noever if (tb->root_switch) 315a25c8b2fSAndreas Noever tb_switch_free(tb->root_switch); 316a25c8b2fSAndreas Noever tb->root_switch = NULL; 317a25c8b2fSAndreas Noever 318d6cc51cdSAndreas Noever if (tb->ctl) { 319d6cc51cdSAndreas Noever tb_ctl_stop(tb->ctl); 320d6cc51cdSAndreas Noever tb_ctl_free(tb->ctl); 321d6cc51cdSAndreas Noever } 322d6cc51cdSAndreas Noever tb->ctl = NULL; 323d6cc51cdSAndreas Noever tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 324d6cc51cdSAndreas Noever 325d6cc51cdSAndreas Noever /* allow tb_handle_hotplug to acquire the lock */ 326d6cc51cdSAndreas Noever mutex_unlock(&tb->lock); 327d6cc51cdSAndreas Noever if (tb->wq) { 328d6cc51cdSAndreas Noever flush_workqueue(tb->wq); 329d6cc51cdSAndreas Noever destroy_workqueue(tb->wq); 330d6cc51cdSAndreas Noever tb->wq = NULL; 331d6cc51cdSAndreas Noever } 332d6cc51cdSAndreas Noever mutex_destroy(&tb->lock); 333d6cc51cdSAndreas Noever kfree(tb); 334d6cc51cdSAndreas Noever } 335d6cc51cdSAndreas Noever 336d6cc51cdSAndreas Noever /** 337d6cc51cdSAndreas Noever * thunderbolt_alloc_and_start() - setup the thunderbolt bus 338d6cc51cdSAndreas Noever * 339d6cc51cdSAndreas Noever * Allocates a tb_cfg control channel, initializes the root switch, enables 340d6cc51cdSAndreas Noever * plug events and activates pci devices. 341d6cc51cdSAndreas Noever * 342d6cc51cdSAndreas Noever * Return: Returns NULL on error. 343d6cc51cdSAndreas Noever */ 344d6cc51cdSAndreas Noever struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi) 345d6cc51cdSAndreas Noever { 346d6cc51cdSAndreas Noever struct tb *tb; 347d6cc51cdSAndreas Noever 3487adf6097SAndreas Noever BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4); 3497adf6097SAndreas Noever BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4); 3507adf6097SAndreas Noever BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4); 3517adf6097SAndreas Noever 352d6cc51cdSAndreas Noever tb = kzalloc(sizeof(*tb), GFP_KERNEL); 353d6cc51cdSAndreas Noever if (!tb) 354d6cc51cdSAndreas Noever return NULL; 355d6cc51cdSAndreas Noever 356d6cc51cdSAndreas Noever tb->nhi = nhi; 357d6cc51cdSAndreas Noever mutex_init(&tb->lock); 358d6cc51cdSAndreas Noever mutex_lock(&tb->lock); 3593364f0c1SAndreas Noever INIT_LIST_HEAD(&tb->tunnel_list); 360d6cc51cdSAndreas Noever 361d6cc51cdSAndreas Noever tb->wq = alloc_ordered_workqueue("thunderbolt", 0); 362d6cc51cdSAndreas Noever if (!tb->wq) 363d6cc51cdSAndreas Noever goto err_locked; 364d6cc51cdSAndreas Noever 365d6cc51cdSAndreas Noever tb->ctl = tb_ctl_alloc(tb->nhi, tb_schedule_hotplug_handler, tb); 366d6cc51cdSAndreas Noever if (!tb->ctl) 367d6cc51cdSAndreas Noever goto err_locked; 368d6cc51cdSAndreas Noever /* 369d6cc51cdSAndreas Noever * tb_schedule_hotplug_handler may be called as soon as the config 370d6cc51cdSAndreas Noever * channel is started. Thats why we have to hold the lock here. 371d6cc51cdSAndreas Noever */ 372d6cc51cdSAndreas Noever tb_ctl_start(tb->ctl); 373d6cc51cdSAndreas Noever 374a25c8b2fSAndreas Noever tb->root_switch = tb_switch_alloc(tb, 0); 375a25c8b2fSAndreas Noever if (!tb->root_switch) 376a25c8b2fSAndreas Noever goto err_locked; 377a25c8b2fSAndreas Noever 3789da672a4SAndreas Noever /* Full scan to discover devices added before the driver was loaded. */ 3799da672a4SAndreas Noever tb_scan_switch(tb->root_switch); 3803364f0c1SAndreas Noever tb_activate_pcie_devices(tb); 3819da672a4SAndreas Noever 382d6cc51cdSAndreas Noever /* Allow tb_handle_hotplug to progress events */ 383d6cc51cdSAndreas Noever tb->hotplug_active = true; 384d6cc51cdSAndreas Noever mutex_unlock(&tb->lock); 385d6cc51cdSAndreas Noever return tb; 386d6cc51cdSAndreas Noever 387d6cc51cdSAndreas Noever err_locked: 388d6cc51cdSAndreas Noever mutex_unlock(&tb->lock); 389d6cc51cdSAndreas Noever thunderbolt_shutdown_and_free(tb); 390d6cc51cdSAndreas Noever return NULL; 391d6cc51cdSAndreas Noever } 392d6cc51cdSAndreas Noever 39323dd5bb4SAndreas Noever void thunderbolt_suspend(struct tb *tb) 39423dd5bb4SAndreas Noever { 39523dd5bb4SAndreas Noever tb_info(tb, "suspending...\n"); 39623dd5bb4SAndreas Noever mutex_lock(&tb->lock); 39723dd5bb4SAndreas Noever tb_switch_suspend(tb->root_switch); 39823dd5bb4SAndreas Noever tb_ctl_stop(tb->ctl); 39923dd5bb4SAndreas Noever tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 40023dd5bb4SAndreas Noever mutex_unlock(&tb->lock); 40123dd5bb4SAndreas Noever tb_info(tb, "suspend finished\n"); 40223dd5bb4SAndreas Noever } 40323dd5bb4SAndreas Noever 40423dd5bb4SAndreas Noever void thunderbolt_resume(struct tb *tb) 40523dd5bb4SAndreas Noever { 40623dd5bb4SAndreas Noever struct tb_pci_tunnel *tunnel, *n; 40723dd5bb4SAndreas Noever tb_info(tb, "resuming...\n"); 40823dd5bb4SAndreas Noever mutex_lock(&tb->lock); 40923dd5bb4SAndreas Noever tb_ctl_start(tb->ctl); 41023dd5bb4SAndreas Noever 41123dd5bb4SAndreas Noever /* remove any pci devices the firmware might have setup */ 41223dd5bb4SAndreas Noever tb_switch_reset(tb, 0); 41323dd5bb4SAndreas Noever 41423dd5bb4SAndreas Noever tb_switch_resume(tb->root_switch); 41523dd5bb4SAndreas Noever tb_free_invalid_tunnels(tb); 41623dd5bb4SAndreas Noever tb_free_unplugged_children(tb->root_switch); 41723dd5bb4SAndreas Noever list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) 41823dd5bb4SAndreas Noever tb_pci_restart(tunnel); 41923dd5bb4SAndreas Noever if (!list_empty(&tb->tunnel_list)) { 42023dd5bb4SAndreas Noever /* 42123dd5bb4SAndreas Noever * the pcie links need some time to get going. 42223dd5bb4SAndreas Noever * 100ms works for me... 42323dd5bb4SAndreas Noever */ 42423dd5bb4SAndreas Noever tb_info(tb, "tunnels restarted, sleeping for 100ms\n"); 42523dd5bb4SAndreas Noever msleep(100); 42623dd5bb4SAndreas Noever } 42723dd5bb4SAndreas Noever /* Allow tb_handle_hotplug to progress events */ 42823dd5bb4SAndreas Noever tb->hotplug_active = true; 42923dd5bb4SAndreas Noever mutex_unlock(&tb->lock); 43023dd5bb4SAndreas Noever tb_info(tb, "resume finished\n"); 43123dd5bb4SAndreas Noever } 432