1 // SPDX-License-Identifier: GPL-2.0
3  * Thunderbolt driver - bus logic (NHI independent)
30  * direction. This is 40G - 10% guard band bandwidth.
53  * struct tb_cm - Simple Thunderbolt connection manager
74 	return ((void *)tcm - sizeof(struct tb));  in tcm_to_tb()
101 	ev->tb = tb;  in tb_queue_hotplug()
102 	ev->route = route;  in tb_queue_hotplug()
103 	ev->port = port;  in tb_queue_hotplug()
104 	ev->unplug = unplug;  in tb_queue_hotplug()
105 	INIT_DELAYED_WORK(&ev->work, tb_handle_hotplug);  in tb_queue_hotplug()
106 	queue_delayed_work(tb->wq, &ev->work, 0);  in tb_queue_hotplug()
111 static void tb_add_dp_resources(struct tb_switch *sw)  in tb_add_dp_resources()  argument
113 	struct tb_cm *tcm = tb_priv(sw->tb);  in tb_add_dp_resources()
116 	tb_switch_for_each_port(sw, port) {  in tb_add_dp_resources()
120 		if (!tb_switch_query_dp_resource(sw, port))  in tb_add_dp_resources()
129 		if (tb_route(sw))  in tb_add_dp_resources()
130 			list_add(&port->list, &tcm->dp_resources);  in tb_add_dp_resources()
132 			list_add_tail(&port->list, &tcm->dp_resources);  in tb_add_dp_resources()
138 static void tb_remove_dp_resources(struct tb_switch *sw)  in tb_remove_dp_resources()  argument
140 	struct tb_cm *tcm = tb_priv(sw->tb);  in tb_remove_dp_resources()
144 	tb_switch_for_each_port(sw, port) {  in tb_remove_dp_resources()
146 			tb_remove_dp_resources(port->remote->sw);  in tb_remove_dp_resources()
149 	list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) {  in tb_remove_dp_resources()
150 		if (port->sw == sw) {  in tb_remove_dp_resources()
152 			list_del_init(&port->list);  in tb_remove_dp_resources()
162 	list_for_each_entry(p, &tcm->dp_resources, list) {  in tb_discover_dp_resource()
169 	list_add_tail(&port->list, &tcm->dp_resources);  in tb_discover_dp_resource()
177 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_discover_dp_resources()
179 			tb_discover_dp_resource(tb, tunnel->dst_port);  in tb_discover_dp_resources()
184 static int tb_enable_clx(struct tb_switch *sw)  in tb_enable_clx()  argument
186 	struct tb_cm *tcm = tb_priv(sw->tb);  in tb_enable_clx()
198 	while (sw && tb_switch_depth(sw) > 1)  in tb_enable_clx()
199 		sw = tb_switch_parent(sw);  in tb_enable_clx()
201 	if (!sw)  in tb_enable_clx()
204 	if (tb_switch_depth(sw) != 1)  in tb_enable_clx()
208 	 * If we are re-enabling then check if there is an active DMA  in tb_enable_clx()
211 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_enable_clx()
213 			if (tb_tunnel_port_on_path(tunnel, tb_upstream_port(sw)))  in tb_enable_clx()
222 	ret = tb_switch_clx_enable(sw, clx | TB_CL2);  in tb_enable_clx()
223 	if (ret == -EOPNOTSUPP)  in tb_enable_clx()
224 		ret = tb_switch_clx_enable(sw, clx);  in tb_enable_clx()
225 	return ret == -EOPNOTSUPP ? 0 : ret;  in tb_enable_clx()
229  * tb_disable_clx() - Disable CL states up to host router
230  * @sw: Router to start
232  * Disables CL states from @sw up to the host router. Returns true if
237 static bool tb_disable_clx(struct tb_switch *sw)  in tb_disable_clx()  argument
244 		ret = tb_switch_clx_disable(sw);  in tb_disable_clx()
248 			tb_sw_warn(sw, "failed to disable CL states\n");  in tb_disable_clx()
250 		sw = tb_switch_parent(sw);  in tb_disable_clx()
251 	} while (sw);  in tb_disable_clx()
258 	struct tb_switch *sw;  in tb_increase_switch_tmu_accuracy()  local
260 	sw = tb_to_switch(dev);  in tb_increase_switch_tmu_accuracy()
261 	if (!sw)  in tb_increase_switch_tmu_accuracy()
264 	if (tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_LOWRES)) {  in tb_increase_switch_tmu_accuracy()
268 		if (tb_switch_clx_is_enabled(sw, TB_CL1))  in tb_increase_switch_tmu_accuracy()
273 		ret = tb_switch_tmu_configure(sw, mode);  in tb_increase_switch_tmu_accuracy()
277 		return tb_switch_tmu_enable(sw);  in tb_increase_switch_tmu_accuracy()
285 	struct tb_switch *sw;  in tb_increase_tmu_accuracy()  local
299 	sw = tunnel->tb->root_switch;  in tb_increase_tmu_accuracy()
300 	device_for_each_child(&sw->dev, NULL, tb_increase_switch_tmu_accuracy);  in tb_increase_tmu_accuracy()
305 	struct tb_switch *sw = tb_to_switch(dev);  in tb_switch_tmu_hifi_uni_required()  local
307 	if (sw && tb_switch_tmu_is_enabled(sw) &&  in tb_switch_tmu_hifi_uni_required()
308 	    tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_HIFI_UNI))  in tb_switch_tmu_hifi_uni_required()
317 	return device_for_each_child(&tb->dev, NULL,  in tb_tmu_hifi_uni_required()
321 static int tb_enable_tmu(struct tb_switch *sw)  in tb_enable_tmu()  argument
327 	 * enable the enhanched uni-directional mode. That covers all  in tb_enable_tmu()
328 	 * the CL states. For v1 and before we need to use the normal  in tb_enable_tmu()
332 	ret = tb_switch_tmu_configure(sw,  in tb_enable_tmu()
334 	if (ret == -EOPNOTSUPP) {  in tb_enable_tmu()
335 		if (tb_switch_clx_is_enabled(sw, TB_CL1)) {  in tb_enable_tmu()
337 			 * Figure out uni-directional HiFi TMU requirements  in tb_enable_tmu()
339 			 * uni-directional HiFi requirements we can put the TMU  in tb_enable_tmu()
342 			 * Deliberately skip bi-directional HiFi links  in tb_enable_tmu()
346 			if (tb_tmu_hifi_uni_required(sw->tb))  in tb_enable_tmu()
347 				ret = tb_switch_tmu_configure(sw,  in tb_enable_tmu()
350 				ret = tb_switch_tmu_configure(sw,  in tb_enable_tmu()
353 			ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI);  in tb_enable_tmu()
356 		/* If not supported, fallback to bi-directional HiFi */  in tb_enable_tmu()
357 		if (ret == -EOPNOTSUPP)  in tb_enable_tmu()
358 			ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI);  in tb_enable_tmu()
364 	if (tb_switch_tmu_is_enabled(sw))  in tb_enable_tmu()
367 	ret = tb_switch_tmu_disable(sw);  in tb_enable_tmu()
371 	ret = tb_switch_tmu_post_time(sw);  in tb_enable_tmu()
375 	return tb_switch_tmu_enable(sw);  in tb_enable_tmu()
378 static void tb_switch_discover_tunnels(struct tb_switch *sw,  in tb_switch_discover_tunnels()  argument
382 	struct tb *tb = sw->tb;  in tb_switch_discover_tunnels()
385 	tb_switch_for_each_port(sw, port) {  in tb_switch_discover_tunnels()
388 		switch (port->config.type) {  in tb_switch_discover_tunnels()
407 			list_add_tail(&tunnel->list, list);  in tb_switch_discover_tunnels()
410 	tb_switch_for_each_port(sw, port) {  in tb_switch_discover_tunnels()
412 			tb_switch_discover_tunnels(port->remote->sw, list,  in tb_switch_discover_tunnels()
420 	if (tb_switch_is_usb4(port->sw))  in tb_port_configure_xdomain()
427 	if (tb_switch_is_usb4(port->sw))  in tb_port_unconfigure_xdomain()
435 	struct tb_switch *sw = port->sw;  in tb_scan_xdomain()  local
436 	struct tb *tb = sw->tb;  in tb_scan_xdomain()
450 	xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid,  in tb_scan_xdomain()
453 		tb_port_at(route, sw)->xdomain = xd;  in tb_scan_xdomain()
460  * tb_find_unused_port() - return the first inactive port on @sw
461  * @sw: Switch to find the port on
464 static struct tb_port *tb_find_unused_port(struct tb_switch *sw,  in tb_find_unused_port()  argument
469 	tb_switch_for_each_port(sw, port) {  in tb_find_unused_port()
472 		if (port->config.type != type)  in tb_find_unused_port()
474 		if (!port->cap_adap)  in tb_find_unused_port()
483 static struct tb_port *tb_find_usb3_down(struct tb_switch *sw,  in tb_find_usb3_down()  argument
488 	down = usb4_switch_map_usb3_down(sw, port);  in tb_find_usb3_down()
501 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_find_tunnel()
502 		if (tunnel->type == type &&  in tb_find_tunnel()
503 		    ((src_port && src_port == tunnel->src_port) ||  in tb_find_tunnel()
504 		     (dst_port && dst_port == tunnel->dst_port))) {  in tb_find_tunnel()
517 	struct tb_switch *sw;  in tb_find_first_usb3_tunnel()  local
521 		sw = dst_port->sw;  in tb_find_first_usb3_tunnel()
523 		sw = src_port->sw;  in tb_find_first_usb3_tunnel()
526 	if (sw == tb->root_switch)  in tb_find_first_usb3_tunnel()
530 	port = tb_port_at(tb_route(sw), tb->root_switch);  in tb_find_first_usb3_tunnel()
532 	usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port);  in tb_find_first_usb3_tunnel()
540  * tb_consumed_usb3_pcie_bandwidth() - Consumed USB3/PCIe bandwidth over a single link
589  * tb_consumed_dp_bandwidth() - Consumed DP bandwidth over a single link
624 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_consumed_dp_bandwidth()
642 		group = tunnel->src_port->group;  in tb_consumed_dp_bandwidth()
643 		if (group && group->reserved && !group_reserved[group->index])  in tb_consumed_dp_bandwidth()
644 			group_reserved[group->index] = group->reserved;  in tb_consumed_dp_bandwidth()
649 		 * re-calculating estimated bandwidth.  in tb_consumed_dp_bandwidth()
651 		if (tunnel->src_port == src_port &&  in tb_consumed_dp_bandwidth()
652 		    tunnel->dst_port == dst_port)  in tb_consumed_dp_bandwidth()
690  * tb_maximum_bandwidth() - Maximum bandwidth over a single link
720 		link_speed = port->sw->link_speed;  in tb_maximum_bandwidth()
722 		 * sw->link_width is from upstream perspective so we use  in tb_maximum_bandwidth()
725 		if (port->sw->link_width == TB_LINK_WIDTH_ASYM_TX) {  in tb_maximum_bandwidth()
728 		} else if (port->sw->link_width == TB_LINK_WIDTH_ASYM_RX) {  in tb_maximum_bandwidth()
746 			up_bw = link_speed * port->sw->link_width * 1000;  in tb_maximum_bandwidth()
785 	*max_up = up_bw - up_bw / 10;  in tb_maximum_bandwidth()
786 	*max_down = down_bw - down_bw / 10;  in tb_maximum_bandwidth()
793  * tb_available_bandwidth() - Available bandwidth for tunneling
838 		max_up -= consumed_up;  in tb_available_bandwidth()
839 		max_down -= consumed_down;  in tb_available_bandwidth()
845 		max_up -= consumed_up;  in tb_available_bandwidth()
846 		max_down -= consumed_down;  in tb_available_bandwidth()
888 	ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port,  in tb_reclaim_usb3_bandwidth()
901 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)  in tb_tunnel_usb3()  argument
903 	struct tb_switch *parent = tb_switch_parent(sw);  in tb_tunnel_usb3()
914 	up = tb_switch_find_port(sw, TB_TYPE_USB3_UP);  in tb_tunnel_usb3()
918 	if (!sw->link_usb4)  in tb_tunnel_usb3()
925 	port = tb_switch_downstream_port(sw);  in tb_tunnel_usb3()
958 		ret = -ENOMEM;  in tb_tunnel_usb3()
965 		ret = -EIO;  in tb_tunnel_usb3()
969 	list_add_tail(&tunnel->list, &tcm->tunnel_list);  in tb_tunnel_usb3()
984 static int tb_create_usb3_tunnels(struct tb_switch *sw)  in tb_create_usb3_tunnels()  argument
992 	if (tb_route(sw)) {  in tb_create_usb3_tunnels()
993 		ret = tb_tunnel_usb3(sw->tb, sw);  in tb_create_usb3_tunnels()
998 	tb_switch_for_each_port(sw, port) {  in tb_create_usb3_tunnels()
1001 		ret = tb_create_usb3_tunnels(port->remote->sw);  in tb_create_usb3_tunnels()
1010  * tb_configure_asym() - Transition links to asymmetric if needed
1029 	struct tb_switch *sw;  in tb_configure_asym()  local
1039 		sw = dst_port->sw;  in tb_configure_asym()
1041 		sw = src_port->sw;  in tb_configure_asym()
1044 		struct tb_port *down = tb_switch_downstream_port(up->sw);  in tb_configure_asym()
1056 			 * (40G - guard band 10%), and the requested is above  in tb_configure_asym()
1060 				ret = -ENOBUFS;  in tb_configure_asym()
1072 				ret = -ENOBUFS;  in tb_configure_asym()
1082 		if (up->sw->link_width == width_up)  in tb_configure_asym()
1095 			clx = tb_disable_clx(sw);  in tb_configure_asym()
1099 		tb_sw_dbg(up->sw, "configuring asymmetric link\n");  in tb_configure_asym()
1105 		ret = tb_switch_set_link_width(up->sw, width_up);  in tb_configure_asym()
1107 			tb_sw_warn(up->sw, "failed to set link width\n");  in tb_configure_asym()
1112 	/* Re-enable CL states if they were previosly enabled */  in tb_configure_asym()
1114 		tb_enable_clx(sw);  in tb_configure_asym()
1120  * tb_configure_sym() - Transition links to symmetric if possible
1134 	struct tb_switch *sw;  in tb_configure_sym()  local
1144 		sw = dst_port->sw;  in tb_configure_sym()
1146 		sw = src_port->sw;  in tb_configure_sym()
1152 		if (up->sw->link_width <= TB_LINK_WIDTH_DUAL)  in tb_configure_sym()
1155 		if (up->sw->is_unplugged)  in tb_configure_sym()
1177 		if (up->sw->link_width == TB_LINK_WIDTH_DUAL)  in tb_configure_sym()
1188 		    up->sw->preferred_link_width > TB_LINK_WIDTH_DUAL) {  in tb_configure_sym()
1189 			tb_sw_dbg(up->sw, "keeping preferred asymmetric link\n");  in tb_configure_sym()
1195 			clx = tb_disable_clx(sw);  in tb_configure_sym()
1199 		tb_sw_dbg(up->sw, "configuring symmetric link\n");  in tb_configure_sym()
1201 		ret = tb_switch_set_link_width(up->sw, TB_LINK_WIDTH_DUAL);  in tb_configure_sym()
1203 			tb_sw_warn(up->sw, "failed to set link width\n");  in tb_configure_sym()
1208 	/* Re-enable CL states if they were previosly enabled */  in tb_configure_sym()
1210 		tb_enable_clx(sw);  in tb_configure_sym()
1216 			      struct tb_switch *sw)  in tb_configure_link()  argument
1218 	struct tb *tb = sw->tb;  in tb_configure_link()
1221 	down->remote = up;  in tb_configure_link()
1222 	up->remote = down;  in tb_configure_link()
1223 	if (down->dual_link_port && up->dual_link_port) {  in tb_configure_link()
1224 		down->dual_link_port->remote = up->dual_link_port;  in tb_configure_link()
1225 		up->dual_link_port->remote = down->dual_link_port;  in tb_configure_link()
1232 	if (sw->link_width < TB_LINK_WIDTH_DUAL)  in tb_configure_link()
1233 		tb_switch_set_link_width(sw, TB_LINK_WIDTH_DUAL);  in tb_configure_link()
1240 	if (tb_switch_depth(sw) > 1 &&  in tb_configure_link()
1242 	    up->sw->link_width == TB_LINK_WIDTH_DUAL) {  in tb_configure_link()
1245 		host_port = tb_port_at(tb_route(sw), tb->root_switch);  in tb_configure_link()
1250 	tb_switch_configure_link(sw);  in tb_configure_link()
1254  * tb_scan_switch() - scan for and initialize downstream switches
1256 static void tb_scan_switch(struct tb_switch *sw)  in tb_scan_switch()  argument
1260 	pm_runtime_get_sync(&sw->dev);  in tb_scan_switch()
1262 	tb_switch_for_each_port(sw, port)  in tb_scan_switch()
1265 	pm_runtime_mark_last_busy(&sw->dev);  in tb_scan_switch()
1266 	pm_runtime_put_autosuspend(&sw->dev);  in tb_scan_switch()
1270  * tb_scan_port() - check for and initialize switches below port
1274 	struct tb_cm *tcm = tb_priv(port->sw->tb);  in tb_scan_port()
1277 	struct tb_switch *sw;  in tb_scan_port()  local
1285 		tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port,  in tb_scan_port()
1290 	if (port->config.type != TB_TYPE_PORT)  in tb_scan_port()
1292 	if (port->dual_link_port && port->link_nr)  in tb_scan_port()
1298 	if (port->usb4)  in tb_scan_port()
1299 		pm_runtime_get_sync(&port->usb4->dev);  in tb_scan_port()
1303 	if (port->remote) {  in tb_scan_port()
1310 	sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,  in tb_scan_port()
1312 	if (IS_ERR(sw)) {  in tb_scan_port()
1318 		if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL)  in tb_scan_port()
1323 	if (tb_switch_configure(sw)) {  in tb_scan_port()
1324 		tb_switch_put(sw);  in tb_scan_port()
1332 	if (port->xdomain) {  in tb_scan_port()
1333 		tb_xdomain_remove(port->xdomain);  in tb_scan_port()
1335 		port->xdomain = NULL;  in tb_scan_port()
1343 	if (!tcm->hotplug_active) {  in tb_scan_port()
1344 		dev_set_uevent_suppress(&sw->dev, true);  in tb_scan_port()
1350 	 * can support runtime PM.  in tb_scan_port()
1352 	sw->rpm = sw->generation > 1;  in tb_scan_port()
1354 	if (tb_switch_add(sw)) {  in tb_scan_port()
1355 		tb_switch_put(sw);  in tb_scan_port()
1359 	upstream_port = tb_upstream_port(sw);  in tb_scan_port()
1360 	tb_configure_link(port, upstream_port, sw);  in tb_scan_port()
1367 		tb_sw_dbg(sw, "discovery, not touching CL states\n");  in tb_scan_port()
1368 	else if (tb_enable_clx(sw))  in tb_scan_port()
1369 		tb_sw_warn(sw, "failed to enable CL states\n");  in tb_scan_port()
1371 	if (tb_enable_tmu(sw))  in tb_scan_port()
1372 		tb_sw_warn(sw, "failed to enable TMU\n");  in tb_scan_port()
1378 	tb_switch_configuration_valid(sw);  in tb_scan_port()
1389 	if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw))  in tb_scan_port()
1390 		tb_sw_warn(sw, "USB3 tunnel creation failed\n");  in tb_scan_port()
1392 	tb_add_dp_resources(sw);  in tb_scan_port()
1393 	tb_scan_switch(sw);  in tb_scan_port()
1396 	if (port->usb4) {  in tb_scan_port()
1397 		pm_runtime_mark_last_busy(&port->usb4->dev);  in tb_scan_port()
1398 		pm_runtime_put_autosuspend(&port->usb4->dev);  in tb_scan_port()
1406 	struct tb *tb = group->tb;  in tb_recalc_estimated_bandwidth_for_group()
1410 	tb_dbg(tb, "re-calculating bandwidth estimation for group %u\n",  in tb_recalc_estimated_bandwidth_for_group()
1411 	       group->index);  in tb_recalc_estimated_bandwidth_for_group()
1414 	list_for_each_entry(in, &group->ports, group_list) {  in tb_recalc_estimated_bandwidth_for_group()
1436 				first_tunnel->src_port, first_tunnel->dst_port);  in tb_recalc_estimated_bandwidth_for_group()
1444 		out = tunnel->dst_port;  in tb_recalc_estimated_bandwidth_for_group()
1449 				"failed to re-calculate estimated bandwidth\n");  in tb_recalc_estimated_bandwidth_for_group()
1455 		 *  - already allocated bandwidth for the DP tunnel  in tb_recalc_estimated_bandwidth_for_group()
1456 		 *  - available bandwidth along the path  in tb_recalc_estimated_bandwidth_for_group()
1457 		 *  - bandwidth allocated for USB 3.x but not used.  in tb_recalc_estimated_bandwidth_for_group()
1469 			      "re-calculated estimated bandwidth %u (+ %u reserved) = %u Mb/s\n",  in tb_recalc_estimated_bandwidth_for_group()
1470 			      estimated_bw, group->reserved,  in tb_recalc_estimated_bandwidth_for_group()
1471 			      estimated_bw + group->reserved);  in tb_recalc_estimated_bandwidth_for_group()
1474 				estimated_bw + group->reserved))  in tb_recalc_estimated_bandwidth_for_group()
1480 		tb_reclaim_usb3_bandwidth(tb, first_tunnel->src_port,  in tb_recalc_estimated_bandwidth_for_group()
1481 					  first_tunnel->dst_port);  in tb_recalc_estimated_bandwidth_for_group()
1483 	tb_dbg(tb, "bandwidth estimation for group %u done\n", group->index);  in tb_recalc_estimated_bandwidth_for_group()
1491 	tb_dbg(tb, "bandwidth consumption changed, re-calculating estimated bandwidth\n");  in tb_recalc_estimated_bandwidth()
1493 	for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) {  in tb_recalc_estimated_bandwidth()
1494 		struct tb_bandwidth_group *group = &tcm->groups[i];  in tb_recalc_estimated_bandwidth()
1496 		if (!list_empty(&group->ports))  in tb_recalc_estimated_bandwidth()
1500 	tb_dbg(tb, "bandwidth re-calculation done\n");  in tb_recalc_estimated_bandwidth()
1505 	if (group->reserved) {  in __release_group_bandwidth()
1506 		tb_dbg(group->tb, "group %d released total %d Mb/s\n", group->index,  in __release_group_bandwidth()
1507 			group->reserved);  in __release_group_bandwidth()
1508 		group->reserved = 0;  in __release_group_bandwidth()
1519 	if (list_empty(&group->ports))  in __configure_group_sym()
1532 	in = list_first_entry(&group->ports, struct tb_port, group_list);  in __configure_group_sym()
1533 	tunnel = tb_find_tunnel(group->tb, TB_TUNNEL_DP, in, NULL);  in __configure_group_sym()
1535 		tb_configure_sym(group->tb, in, tunnel->dst_port, true);  in __configure_group_sym()
1542 	struct tb *tb = group->tb;  in tb_bandwidth_group_release_work()
1544 	mutex_lock(&tb->lock);  in tb_bandwidth_group_release_work()
1548 	mutex_unlock(&tb->lock);  in tb_bandwidth_group_release_work()
1555 	for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) {  in tb_init_bandwidth_groups()
1556 		struct tb_bandwidth_group *group = &tcm->groups[i];  in tb_init_bandwidth_groups()
1558 		group->tb = tcm_to_tb(tcm);  in tb_init_bandwidth_groups()
1559 		group->index = i + 1;  in tb_init_bandwidth_groups()
1560 		INIT_LIST_HEAD(&group->ports);  in tb_init_bandwidth_groups()
1561 		INIT_DELAYED_WORK(&group->release_work,  in tb_init_bandwidth_groups()
1569 	if (!group || WARN_ON(in->group))  in tb_bandwidth_group_attach_port()
1572 	in->group = group;  in tb_bandwidth_group_attach_port()
1573 	list_add_tail(&in->group_list, &group->ports);  in tb_bandwidth_group_attach_port()
1575 	tb_port_dbg(in, "attached to bandwidth group %d\n", group->index);  in tb_bandwidth_group_attach_port()
1582 	for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) {  in tb_find_free_bandwidth_group()
1583 		struct tb_bandwidth_group *group = &tcm->groups[i];  in tb_find_free_bandwidth_group()
1585 		if (list_empty(&group->ports))  in tb_find_free_bandwidth_group()
1605 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_attach_bandwidth_group()
1609 		if (tunnel->src_port->sw == in->sw &&  in tb_attach_bandwidth_group()
1610 		    tunnel->dst_port->sw == out->sw) {  in tb_attach_bandwidth_group()
1611 			group = tunnel->src_port->group;  in tb_attach_bandwidth_group()
1636 		for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) {  in tb_discover_bandwidth_group()
1637 			if (tcm->groups[i].index == index) {  in tb_discover_bandwidth_group()
1638 				tb_bandwidth_group_attach_port(&tcm->groups[i], in);  in tb_discover_bandwidth_group()
1649 	struct tb_bandwidth_group *group = in->group;  in tb_detach_bandwidth_group()
1652 		in->group = NULL;  in tb_detach_bandwidth_group()
1653 		list_del_init(&in->group_list);  in tb_detach_bandwidth_group()
1655 		tb_port_dbg(in, "detached from bandwidth group %d\n", group->index);  in tb_detach_bandwidth_group()
1658 		if (list_empty(&group->ports)) {  in tb_detach_bandwidth_group()
1659 			cancel_delayed_work(&group->release_work);  in tb_detach_bandwidth_group()
1670 	tb_switch_discover_tunnels(tb->root_switch, &tcm->tunnel_list, true);  in tb_discover_tunnels()
1672 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_discover_tunnels()
1674 			struct tb_switch *parent = tunnel->dst_port->sw;  in tb_discover_tunnels()
1676 			while (parent != tunnel->src_port->sw) {  in tb_discover_tunnels()
1677 				parent->boot = true;  in tb_discover_tunnels()
1681 			struct tb_port *in = tunnel->src_port;  in tb_discover_tunnels()
1682 			struct tb_port *out = tunnel->dst_port;  in tb_discover_tunnels()
1685 			pm_runtime_get_sync(&in->sw->dev);  in tb_discover_tunnels()
1686 			pm_runtime_get_sync(&out->sw->dev);  in tb_discover_tunnels()
1702 	list_del(&tunnel->list);  in tb_deactivate_and_free_tunnel()
1704 	tb = tunnel->tb;  in tb_deactivate_and_free_tunnel()
1705 	src_port = tunnel->src_port;  in tb_deactivate_and_free_tunnel()
1706 	dst_port = tunnel->dst_port;  in tb_deactivate_and_free_tunnel()
1708 	switch (tunnel->type) {  in tb_deactivate_and_free_tunnel()
1715 		tb_switch_dealloc_dp_resource(src_port->sw, src_port);  in tb_deactivate_and_free_tunnel()
1722 		pm_runtime_mark_last_busy(&dst_port->sw->dev);  in tb_deactivate_and_free_tunnel()
1723 		pm_runtime_put_autosuspend(&dst_port->sw->dev);  in tb_deactivate_and_free_tunnel()
1724 		pm_runtime_mark_last_busy(&src_port->sw->dev);  in tb_deactivate_and_free_tunnel()
1725 		pm_runtime_put_autosuspend(&src_port->sw->dev);  in tb_deactivate_and_free_tunnel()
1744  * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
1752 	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {  in tb_free_invalid_tunnels()
1759  * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
1761 static void tb_free_unplugged_children(struct tb_switch *sw)  in tb_free_unplugged_children()  argument
1765 	tb_switch_for_each_port(sw, port) {  in tb_free_unplugged_children()
1769 		if (port->remote->sw->is_unplugged) {  in tb_free_unplugged_children()
1771 			tb_remove_dp_resources(port->remote->sw);  in tb_free_unplugged_children()
1772 			tb_switch_unconfigure_link(port->remote->sw);  in tb_free_unplugged_children()
1773 			tb_switch_set_link_width(port->remote->sw,  in tb_free_unplugged_children()
1775 			tb_switch_remove(port->remote->sw);  in tb_free_unplugged_children()
1776 			port->remote = NULL;  in tb_free_unplugged_children()
1777 			if (port->dual_link_port)  in tb_free_unplugged_children()
1778 				port->dual_link_port->remote = NULL;  in tb_free_unplugged_children()
1780 			tb_free_unplugged_children(port->remote->sw);  in tb_free_unplugged_children()
1785 static struct tb_port *tb_find_pcie_down(struct tb_switch *sw,  in tb_find_pcie_down()  argument
1794 	if (tb_switch_is_usb4(sw)) {  in tb_find_pcie_down()
1795 		down = usb4_switch_map_pcie_down(sw, port);  in tb_find_pcie_down()
1796 	} else if (!tb_route(sw)) {  in tb_find_pcie_down()
1797 		int phy_port = tb_phy_port_from_link(port->port);  in tb_find_pcie_down()
1801 		 * Hard-coded Thunderbolt port to PCIe down port mapping  in tb_find_pcie_down()
1804 		if (tb_switch_is_cactus_ridge(sw) ||  in tb_find_pcie_down()
1805 		    tb_switch_is_alpine_ridge(sw))  in tb_find_pcie_down()
1807 		else if (tb_switch_is_falcon_ridge(sw))  in tb_find_pcie_down()
1809 		else if (tb_switch_is_titan_ridge(sw))  in tb_find_pcie_down()
1814 		/* Validate the hard-coding */  in tb_find_pcie_down()
1815 		if (WARN_ON(index > sw->config.max_port_number))  in tb_find_pcie_down()
1818 		down = &sw->ports[index];  in tb_find_pcie_down()
1831 	return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN);  in tb_find_pcie_down()
1839 	host_port = tb_route(in->sw) ?  in tb_find_dp_out()
1840 		tb_port_at(tb_route(in->sw), tb->root_switch) : NULL;  in tb_find_dp_out()
1842 	list_for_each_entry(port, &tcm->dp_resources, list) {  in tb_find_dp_out()
1847 			tb_port_dbg(port, "DP OUT in use\n");  in tb_find_dp_out()
1852 		if (in->sw == port->sw) {  in tb_find_dp_out()
1863 		if (host_port && tb_route(port->sw)) {  in tb_find_dp_out()
1866 			p = tb_port_at(tb_route(port->sw), tb->root_switch);  in tb_find_dp_out()
1879 	struct tb_port *in = tunnel->src_port;  in tb_dp_tunnel_active()
1880 	struct tb_port *out = tunnel->dst_port;  in tb_dp_tunnel_active()
1883 	mutex_lock(&tb->lock);  in tb_dp_tunnel_active()
1917 		struct tb_port *in = tunnel->src_port;  in tb_dp_tunnel_active()
1928 		 * also tear down the tunnel and try to re-use the  in tb_dp_tunnel_active()
1937 	mutex_unlock(&tb->lock);  in tb_dp_tunnel_active()
1956 	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {  in tb_tunnel_one_dp()
1971 	pm_runtime_get_sync(&in->sw->dev);  in tb_tunnel_one_dp()
1972 	pm_runtime_get_sync(&out->sw->dev);  in tb_tunnel_one_dp()
1974 	if (tb_switch_alloc_dp_resource(in->sw, in)) {  in tb_tunnel_one_dp()
2005 	list_add_tail(&tunnel->list, &tcm->tunnel_list);  in tb_tunnel_one_dp()
2008 	if (ret && ret != -EINPROGRESS) {  in tb_tunnel_one_dp()
2010 		list_del(&tunnel->list);  in tb_tunnel_one_dp()
2024 	tb_switch_dealloc_dp_resource(in->sw, in);  in tb_tunnel_one_dp()
2026 	pm_runtime_mark_last_busy(&out->sw->dev);  in tb_tunnel_one_dp()
2027 	pm_runtime_put_autosuspend(&out->sw->dev);  in tb_tunnel_one_dp()
2028 	pm_runtime_mark_last_busy(&in->sw->dev);  in tb_tunnel_one_dp()
2029 	pm_runtime_put_autosuspend(&in->sw->dev);  in tb_tunnel_one_dp()
2046 	tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n");  in tb_tunnel_dp()
2050 	list_for_each_entry(port, &tcm->dp_resources, list) {  in tb_tunnel_dp()
2055 			tb_port_dbg(port, "DP IN in use\n");  in tb_tunnel_dp()
2075 	struct tb_switch *sw = port->sw;  in tb_enter_redrive()  local
2077 	if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE))  in tb_enter_redrive()
2081 	 * If we get hot-unplug for the DP IN port of the host router  in tb_enter_redrive()
2083 	 * is a monitor connected directly to the Type-C port and we are  in tb_enter_redrive()
2085 	 * we bump up the runtime PM reference count here.  in tb_enter_redrive()
2089 	if (tb_route(sw))  in tb_enter_redrive()
2091 	if (!tb_switch_query_dp_resource(sw, port)) {  in tb_enter_redrive()
2092 		port->redrive = true;  in tb_enter_redrive()
2093 		pm_runtime_get(&sw->dev);  in tb_enter_redrive()
2100 	struct tb_switch *sw = port->sw;  in tb_exit_redrive()  local
2102 	if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE))  in tb_exit_redrive()
2107 	if (tb_route(sw))  in tb_exit_redrive()
2109 	if (port->redrive && tb_switch_query_dp_resource(sw, port)) {  in tb_exit_redrive()
2110 		port->redrive = false;  in tb_exit_redrive()
2111 		pm_runtime_put(&sw->dev);  in tb_exit_redrive()
2116 static void tb_switch_enter_redrive(struct tb_switch *sw)  in tb_switch_enter_redrive()  argument
2120 	tb_switch_for_each_port(sw, port)  in tb_switch_enter_redrive()
2128 static void tb_switch_exit_redrive(struct tb_switch *sw)  in tb_switch_exit_redrive()  argument
2132 	if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE))  in tb_switch_exit_redrive()
2135 	tb_switch_for_each_port(sw, port) {  in tb_switch_exit_redrive()
2139 		if (port->redrive) {  in tb_switch_exit_redrive()
2140 			port->redrive = false;  in tb_switch_exit_redrive()
2141 			pm_runtime_put(&sw->dev);  in tb_switch_exit_redrive()
2168 	list_del_init(&port->list);  in tb_dp_resource_unavailable()
2186 	list_for_each_entry(p, &tcm->dp_resources, list) {  in tb_dp_resource_available()
2193 	list_add_tail(&port->list, &tcm->dp_resources);  in tb_dp_resource_available()
2196 	/* Look for suitable DP IN <-> DP OUT pairs now */  in tb_dp_resource_available()
2207 	 * will be re-established after resume based on plug events.  in tb_disconnect_and_release_dp()
2209 	list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) {  in tb_disconnect_and_release_dp()
2214 	while (!list_empty(&tcm->dp_resources)) {  in tb_disconnect_and_release_dp()
2217 		port = list_first_entry(&tcm->dp_resources,  in tb_disconnect_and_release_dp()
2219 		list_del_init(&port->list);  in tb_disconnect_and_release_dp()
2223 static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw)  in tb_disconnect_pci()  argument
2228 	up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP);  in tb_disconnect_pci()
2230 		return -ENODEV;  in tb_disconnect_pci()
2234 		return -ENODEV;  in tb_disconnect_pci()
2236 	tb_switch_xhci_disconnect(sw);  in tb_disconnect_pci()
2239 	list_del(&tunnel->list);  in tb_disconnect_pci()
2244 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw)  in tb_tunnel_pci()  argument
2250 	up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP);  in tb_tunnel_pci()
2258 	port = tb_switch_downstream_port(sw);  in tb_tunnel_pci()
2259 	down = tb_find_pcie_down(tb_switch_parent(sw), port);  in tb_tunnel_pci()
2265 		return -ENOMEM;  in tb_tunnel_pci()
2271 		return -EIO;  in tb_tunnel_pci()
2278 	if (tb_switch_pcie_l1_enable(sw))  in tb_tunnel_pci()
2279 		tb_sw_warn(sw, "failed to enable PCIe L1 for Titan Ridge\n");  in tb_tunnel_pci()
2281 	if (tb_switch_xhci_connect(sw))  in tb_tunnel_pci()
2282 		tb_sw_warn(sw, "failed to connect xHCI\n");  in tb_tunnel_pci()
2284 	list_add_tail(&tunnel->list, &tcm->tunnel_list);  in tb_tunnel_pci()
2295 	struct tb_switch *sw;  in tb_approve_xdomain_paths()  local
2298 	sw = tb_to_switch(xd->dev.parent);  in tb_approve_xdomain_paths()
2299 	dst_port = tb_port_at(xd->route, sw);  in tb_approve_xdomain_paths()
2300 	nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI);  in tb_approve_xdomain_paths()
2302 	mutex_lock(&tb->lock);  in tb_approve_xdomain_paths()
2308 	tb_disable_clx(sw);  in tb_approve_xdomain_paths()
2313 		ret = -ENOMEM;  in tb_approve_xdomain_paths()
2320 		ret = -EIO;  in tb_approve_xdomain_paths()
2324 	list_add_tail(&tunnel->list, &tcm->tunnel_list);  in tb_approve_xdomain_paths()
2325 	mutex_unlock(&tb->lock);  in tb_approve_xdomain_paths()
2331 	tb_enable_clx(sw);  in tb_approve_xdomain_paths()
2332 	mutex_unlock(&tb->lock);  in tb_approve_xdomain_paths()
2344 	struct tb_switch *sw;  in __tb_disconnect_xdomain_paths()  local
2346 	sw = tb_to_switch(xd->dev.parent);  in __tb_disconnect_xdomain_paths()
2347 	dst_port = tb_port_at(xd->route, sw);  in __tb_disconnect_xdomain_paths()
2348 	nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI);  in __tb_disconnect_xdomain_paths()
2350 	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {  in __tb_disconnect_xdomain_paths()
2353 		if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port)  in __tb_disconnect_xdomain_paths()
2362 	 * Try to re-enable CL states now, it is OK if this fails  in __tb_disconnect_xdomain_paths()
2366 	tb_enable_clx(sw);  in __tb_disconnect_xdomain_paths()
2373 	if (!xd->is_unplugged) {  in tb_disconnect_xdomain_paths()
2374 		mutex_lock(&tb->lock);  in tb_disconnect_xdomain_paths()
2378 		mutex_unlock(&tb->lock);  in tb_disconnect_xdomain_paths()
2386  * tb_handle_hotplug() - handle hotplug event
2388  * Executes on tb->wq.
2393 	struct tb *tb = ev->tb;  in tb_handle_hotplug()
2395 	struct tb_switch *sw;  in tb_handle_hotplug()  local
2399 	pm_runtime_get_sync(&tb->dev);  in tb_handle_hotplug()
2401 	mutex_lock(&tb->lock);  in tb_handle_hotplug()
2402 	if (!tcm->hotplug_active)  in tb_handle_hotplug()
2405 	sw = tb_switch_find_by_route(tb, ev->route);  in tb_handle_hotplug()
2406 	if (!sw) {  in tb_handle_hotplug()
2409 			ev->route, ev->port, ev->unplug);  in tb_handle_hotplug()
2412 	if (ev->port > sw->config.max_port_number) {  in tb_handle_hotplug()
2415 			ev->route, ev->port, ev->unplug);  in tb_handle_hotplug()
2418 	port = &sw->ports[ev->port];  in tb_handle_hotplug()
2421 		       ev->route, ev->port, ev->unplug);  in tb_handle_hotplug()
2425 	pm_runtime_get_sync(&sw->dev);  in tb_handle_hotplug()
2427 	if (ev->unplug) {  in tb_handle_hotplug()
2432 			tb_sw_set_unplugged(port->remote->sw);  in tb_handle_hotplug()
2434 			tb_remove_dp_resources(port->remote->sw);  in tb_handle_hotplug()
2435 			tb_switch_tmu_disable(port->remote->sw);  in tb_handle_hotplug()
2436 			tb_switch_unconfigure_link(port->remote->sw);  in tb_handle_hotplug()
2437 			tb_switch_set_link_width(port->remote->sw,  in tb_handle_hotplug()
2439 			tb_switch_remove(port->remote->sw);  in tb_handle_hotplug()
2440 			port->remote = NULL;  in tb_handle_hotplug()
2441 			if (port->dual_link_port)  in tb_handle_hotplug()
2442 				port->dual_link_port->remote = NULL;  in tb_handle_hotplug()
2446 		} else if (port->xdomain) {  in tb_handle_hotplug()
2447 			struct tb_xdomain *xd = tb_xdomain_get(port->xdomain);  in tb_handle_hotplug()
2457 			xd->is_unplugged = true;  in tb_handle_hotplug()
2459 			port->xdomain = NULL;  in tb_handle_hotplug()
2460 			__tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1);  in tb_handle_hotplug()
2465 		} else if (!port->port) {  in tb_handle_hotplug()
2466 			tb_sw_dbg(sw, "xHCI disconnect request\n");  in tb_handle_hotplug()
2467 			tb_switch_xhci_disconnect(sw);  in tb_handle_hotplug()
2472 	} else if (port->remote) {  in tb_handle_hotplug()
2474 	} else if (!port->port && sw->authorized) {  in tb_handle_hotplug()
2475 		tb_sw_dbg(sw, "xHCI connect request\n");  in tb_handle_hotplug()
2476 		tb_switch_xhci_connect(sw);  in tb_handle_hotplug()
2481 			if (!port->remote)  in tb_handle_hotplug()
2488 	pm_runtime_mark_last_busy(&sw->dev);  in tb_handle_hotplug()
2489 	pm_runtime_put_autosuspend(&sw->dev);  in tb_handle_hotplug()
2492 	tb_switch_put(sw);  in tb_handle_hotplug()
2494 	mutex_unlock(&tb->lock);  in tb_handle_hotplug()
2496 	pm_runtime_mark_last_busy(&tb->dev);  in tb_handle_hotplug()
2497 	pm_runtime_put_autosuspend(&tb->dev);  in tb_handle_hotplug()
2509 	struct tb *tb = tunnel->tb;  in tb_alloc_dp_bandwidth()
2517 	in = tunnel->src_port;  in tb_alloc_dp_bandwidth()
2518 	out = tunnel->dst_port;  in tb_alloc_dp_bandwidth()
2530 	 * Since the link cannot go higher than 17280 we use that in our  in tb_alloc_dp_bandwidth()
2571 		ret = -ENOBUFS;  in tb_alloc_dp_bandwidth()
2576 	group = in->group;  in tb_alloc_dp_bandwidth()
2580 		if (tunnel->bw_mode) {  in tb_alloc_dp_bandwidth()
2588 			 * others to use.  in tb_alloc_dp_bandwidth()
2591 				reserved = allocated_down - *requested_down;  in tb_alloc_dp_bandwidth()
2593 				reserved = allocated_up - *requested_up;  in tb_alloc_dp_bandwidth()
2596 				group->reserved += reserved;  in tb_alloc_dp_bandwidth()
2598 				       group->index, reserved, group->reserved);  in tb_alloc_dp_bandwidth()
2608 				mod_delayed_work(system_wq, &group->release_work,  in tb_alloc_dp_bandwidth()
2627 	 * are also in the same group but we use the same function here  in tb_alloc_dp_bandwidth()
2628 	 * that we use with the normal bandwidth allocation).  in tb_alloc_dp_bandwidth()
2636 		      available_up, available_down, group->reserved);  in tb_alloc_dp_bandwidth()
2639 		available_up + group->reserved >= requested_up_corrected) ||  in tb_alloc_dp_bandwidth()
2641 		available_down + group->reserved >= requested_down_corrected)) {  in tb_alloc_dp_bandwidth()
2664 				released = *requested_down - available_down;  in tb_alloc_dp_bandwidth()
2667 				released = *requested_up - available_up;  in tb_alloc_dp_bandwidth()
2670 			group->reserved -= released;  in tb_alloc_dp_bandwidth()
2672 			       group->index, released, group->reserved);  in tb_alloc_dp_bandwidth()
2675 		ret = -ENOBUFS;  in tb_alloc_dp_bandwidth()
2681 	if (ret && ret != -ENODEV) {  in tb_alloc_dp_bandwidth()
2700 	struct tb *tb = ev->tb;  in tb_handle_dp_bandwidth_request()
2702 	struct tb_switch *sw;  in tb_handle_dp_bandwidth_request()  local
2705 	pm_runtime_get_sync(&tb->dev);  in tb_handle_dp_bandwidth_request()
2707 	mutex_lock(&tb->lock);  in tb_handle_dp_bandwidth_request()
2708 	if (!tcm->hotplug_active)  in tb_handle_dp_bandwidth_request()
2711 	sw = tb_switch_find_by_route(tb, ev->route);  in tb_handle_dp_bandwidth_request()
2712 	if (!sw) {  in tb_handle_dp_bandwidth_request()
2713 		tb_warn(tb, "bandwidth request from non-existent router %llx\n",  in tb_handle_dp_bandwidth_request()
2714 			ev->route);  in tb_handle_dp_bandwidth_request()
2718 	in = &sw->ports[ev->port];  in tb_handle_dp_bandwidth_request()
2720 		tb_port_warn(in, "bandwidth request to non-DP IN adapter\n");  in tb_handle_dp_bandwidth_request()
2724 	tb_port_dbg(in, "handling bandwidth allocation request, retry %d\n", ev->retry);  in tb_handle_dp_bandwidth_request()
2733 		if (tunnel->bw_mode) {  in tb_handle_dp_bandwidth_request()
2735 			 * Reset the tunnel back to use the legacy  in tb_handle_dp_bandwidth_request()
2738 			tunnel->bw_mode = false;  in tb_handle_dp_bandwidth_request()
2748 		if (ret == -ENODATA) {  in tb_handle_dp_bandwidth_request()
2768 		requested_up = -1;  in tb_handle_dp_bandwidth_request()
2772 		requested_down = -1;  in tb_handle_dp_bandwidth_request()
2777 		if (ret == -ENOBUFS) {  in tb_handle_dp_bandwidth_request()
2780 		} else if (ret == -ENOTCONN) {  in tb_handle_dp_bandwidth_request()
2789 			if (ev->retry < TB_BW_ALLOC_RETRIES) {  in tb_handle_dp_bandwidth_request()
2792 				tb_queue_dp_bandwidth_request(tb, ev->route,  in tb_handle_dp_bandwidth_request()
2793 							      ev->port,  in tb_handle_dp_bandwidth_request()
2794 							      ev->retry + 1,  in tb_handle_dp_bandwidth_request()
2814 	tb_switch_put(sw);  in tb_handle_dp_bandwidth_request()
2816 	mutex_unlock(&tb->lock);  in tb_handle_dp_bandwidth_request()
2818 	pm_runtime_mark_last_busy(&tb->dev);  in tb_handle_dp_bandwidth_request()
2819 	pm_runtime_put_autosuspend(&tb->dev);  in tb_handle_dp_bandwidth_request()
2833 	ev->tb = tb;  in tb_queue_dp_bandwidth_request()
2834 	ev->route = route;  in tb_queue_dp_bandwidth_request()
2835 	ev->port = port;  in tb_queue_dp_bandwidth_request()
2836 	ev->retry = retry;  in tb_queue_dp_bandwidth_request()
2837 	INIT_DELAYED_WORK(&ev->work, tb_handle_dp_bandwidth_request);  in tb_queue_dp_bandwidth_request()
2838 	queue_delayed_work(tb->wq, &ev->work, delay);  in tb_queue_dp_bandwidth_request()
2845 	switch (error->error) {  in tb_handle_notification()
2849 		if (tb_cfg_ack_notification(tb->ctl, route, error))  in tb_handle_notification()
2855 		if (tb_cfg_ack_notification(tb->ctl, route, error))  in tb_handle_notification()
2858 		tb_queue_dp_bandwidth_request(tb, route, error->port, 0, 0);  in tb_handle_notification()
2868  * tb_schedule_hotplug_handler() - callback function for the control channel
2876 	u64 route = tb_cfg_get_route(&pkg->header);  in tb_handle_event()
2889 	if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) {  in tb_handle_event()
2891 			pkg->port);  in tb_handle_event()
2894 	tb_queue_hotplug(tb, route, pkg->port, pkg->unplug);  in tb_handle_event()
2903 	cancel_delayed_work(&tcm->remove_work);  in tb_stop()
2905 	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {  in tb_stop()
2915 	tb_switch_remove(tb->root_switch);  in tb_stop()
2916 	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */  in tb_stop()
2925 	for (i = 0; i < ARRAY_SIZE(tcm->groups); i++)  in tb_deinit()
2926 		cancel_delayed_work_sync(&tcm->groups[i].release_work);  in tb_deinit()
2932 		struct tb_switch *sw = tb_to_switch(dev);  in tb_scan_finalize_switch()  local
2939 		if (sw->boot)  in tb_scan_finalize_switch()
2940 			sw->authorized = 1;  in tb_scan_finalize_switch()
2943 		kobject_uevent(&dev->kobj, KOBJ_ADD);  in tb_scan_finalize_switch()
2956 	tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);  in tb_start()
2957 	if (IS_ERR(tb->root_switch))  in tb_start()
2958 		return PTR_ERR(tb->root_switch);  in tb_start()
2968 	tb->root_switch->no_nvm_upgrade = !tb_switch_is_usb4(tb->root_switch);  in tb_start()
2969 	/* All USB4 routers support runtime PM */  in tb_start()
2970 	tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch);  in tb_start()
2972 	ret = tb_switch_configure(tb->root_switch);  in tb_start()
2974 		tb_switch_put(tb->root_switch);  in tb_start()
2979 	ret = tb_switch_add(tb->root_switch);  in tb_start()
2981 		tb_switch_put(tb->root_switch);  in tb_start()
2989 	tb_switch_tmu_configure(tb->root_switch, TB_SWITCH_TMU_MODE_LOWRES);  in tb_start()
2991 	tb_switch_tmu_enable(tb->root_switch);  in tb_start()
2999 	if (reset && tb_switch_is_usb4(tb->root_switch)) {  in tb_start()
3001 		if (usb4_switch_version(tb->root_switch) == 1)  in tb_start()
3002 			tb_switch_reset(tb->root_switch);  in tb_start()
3007 		tb_scan_switch(tb->root_switch);  in tb_start()
3018 	tb_create_usb3_tunnels(tb->root_switch);  in tb_start()
3020 	tb_add_dp_resources(tb->root_switch);  in tb_start()
3021 	tb_switch_enter_redrive(tb->root_switch);  in tb_start()
3023 	device_for_each_child(&tb->root_switch->dev, NULL,  in tb_start()
3027 	tcm->hotplug_active = true;  in tb_start()
3037 	tb_switch_exit_redrive(tb->root_switch);  in tb_suspend_noirq()
3038 	tb_switch_suspend(tb->root_switch, false);  in tb_suspend_noirq()
3039 	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */  in tb_suspend_noirq()
3045 static void tb_restore_children(struct tb_switch *sw)  in tb_restore_children()  argument
3050 	if (sw->is_unplugged)  in tb_restore_children()
3053 	if (tb_enable_clx(sw))  in tb_restore_children()
3054 		tb_sw_warn(sw, "failed to re-enable CL states\n");  in tb_restore_children()
3056 	if (tb_enable_tmu(sw))  in tb_restore_children()
3057 		tb_sw_warn(sw, "failed to restore TMU configuration\n");  in tb_restore_children()
3059 	tb_switch_configuration_valid(sw);  in tb_restore_children()
3061 	tb_switch_for_each_port(sw, port) {  in tb_restore_children()
3062 		if (!tb_port_has_remote(port) && !port->xdomain)  in tb_restore_children()
3065 		if (port->remote) {  in tb_restore_children()
3066 			tb_switch_set_link_width(port->remote->sw,  in tb_restore_children()
3067 						 port->remote->sw->link_width);  in tb_restore_children()
3068 			tb_switch_configure_link(port->remote->sw);  in tb_restore_children()
3070 			tb_restore_children(port->remote->sw);  in tb_restore_children()
3071 		} else if (port->xdomain) {  in tb_restore_children()
3072 			tb_port_configure_xdomain(port, port->xdomain);  in tb_restore_children()
3087 	 * For non-USB4 hosts (Apple systems) remove any PCIe devices  in tb_resume_noirq()
3090 	if (!tb_switch_is_usb4(tb->root_switch))  in tb_resume_noirq()
3091 		tb_switch_reset(tb->root_switch);  in tb_resume_noirq()
3093 	tb_switch_resume(tb->root_switch, false);  in tb_resume_noirq()
3095 	tb_free_unplugged_children(tb->root_switch);  in tb_resume_noirq()
3096 	tb_restore_children(tb->root_switch);  in tb_resume_noirq()
3104 	tb_switch_discover_tunnels(tb->root_switch, &tunnels, false);  in tb_resume_noirq()
3112 	/* Re-create our tunnels now */  in tb_resume_noirq()
3113 	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {  in tb_resume_noirq()
3114 		/* USB3 requires delay before it can be re-activated */  in tb_resume_noirq()
3122 	if (!list_empty(&tcm->tunnel_list)) {  in tb_resume_noirq()
3130 	tb_switch_enter_redrive(tb->root_switch);  in tb_resume_noirq()
3132 	tcm->hotplug_active = true;  in tb_resume_noirq()
3138 static int tb_free_unplugged_xdomains(struct tb_switch *sw)  in tb_free_unplugged_xdomains()  argument
3143 	tb_switch_for_each_port(sw, port) {  in tb_free_unplugged_xdomains()
3146 		if (port->xdomain && port->xdomain->is_unplugged) {  in tb_free_unplugged_xdomains()
3148 			tb_xdomain_remove(port->xdomain);  in tb_free_unplugged_xdomains()
3150 			port->xdomain = NULL;  in tb_free_unplugged_xdomains()
3152 		} else if (port->remote) {  in tb_free_unplugged_xdomains()
3153 			ret += tb_free_unplugged_xdomains(port->remote->sw);  in tb_free_unplugged_xdomains()
3164 	tcm->hotplug_active = false;  in tb_freeze_noirq()
3172 	tcm->hotplug_active = true;  in tb_thaw_noirq()
3183 	mutex_lock(&tb->lock);  in tb_complete()
3184 	if (tb_free_unplugged_xdomains(tb->root_switch))  in tb_complete()
3185 		tb_scan_switch(tb->root_switch);  in tb_complete()
3186 	mutex_unlock(&tb->lock);  in tb_complete()
3193 	mutex_lock(&tb->lock);  in tb_runtime_suspend()
3196 	 * re-entering redrive mode.  in tb_runtime_suspend()
3199 	tb_switch_exit_redrive(tb->root_switch);  in tb_runtime_suspend()
3200 	tb_switch_suspend(tb->root_switch, true);  in tb_runtime_suspend()
3201 	tcm->hotplug_active = false;  in tb_runtime_suspend()
3202 	mutex_unlock(&tb->lock);  in tb_runtime_suspend()
3212 	mutex_lock(&tb->lock);  in tb_remove_work()
3213 	if (tb->root_switch) {  in tb_remove_work()
3214 		tb_free_unplugged_children(tb->root_switch);  in tb_remove_work()
3215 		tb_free_unplugged_xdomains(tb->root_switch);  in tb_remove_work()
3217 	mutex_unlock(&tb->lock);  in tb_remove_work()
3225 	mutex_lock(&tb->lock);  in tb_runtime_resume()
3226 	tb_switch_resume(tb->root_switch, true);  in tb_runtime_resume()
3228 	tb_restore_children(tb->root_switch);  in tb_runtime_resume()
3229 	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)  in tb_runtime_resume()
3231 	tb_switch_enter_redrive(tb->root_switch);  in tb_runtime_resume()
3232 	tcm->hotplug_active = true;  in tb_runtime_resume()
3233 	mutex_unlock(&tb->lock);  in tb_runtime_resume()
3240 	queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50));  in tb_runtime_resume()
3277 	switch (nhi->pdev->device) {  in tb_apple_add_links()
3287 	upstream = pci_upstream_bridge(nhi->pdev);  in tb_apple_add_links()
3301 	 * back to NHI so that PCIe tunnels can be re-established after  in tb_apple_add_links()
3305 	for_each_pci_bridge(pdev, upstream->subordinate) {  in tb_apple_add_links()
3311 		    !pdev->is_hotplug_bridge)  in tb_apple_add_links()
3314 		link = device_link_add(&pdev->dev, &nhi->pdev->dev,  in tb_apple_add_links()
3318 			dev_dbg(&nhi->pdev->dev, "created link from %s\n",  in tb_apple_add_links()
3319 				dev_name(&pdev->dev));  in tb_apple_add_links()
3322 			dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",  in tb_apple_add_links()
3323 				 dev_name(&pdev->dev));  in tb_apple_add_links()
3340 		tb->security_level = TB_SECURITY_USER;  in tb_probe()
3342 		tb->security_level = TB_SECURITY_NOPCIE;  in tb_probe()
3344 	tb->cm_ops = &tb_cm_ops;  in tb_probe()
3347 	INIT_LIST_HEAD(&tcm->tunnel_list);  in tb_probe()
3348 	INIT_LIST_HEAD(&tcm->dp_resources);  in tb_probe()
3349 	INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work);  in tb_probe()