| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Thunderbolt driver - bus logic (NHI independent) |
| * |
| * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> |
| * Copyright (C) 2019, Intel Corporation |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/delay.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/platform_data/x86/apple.h> |
| |
| #include "tb.h" |
| #include "tb_regs.h" |
| #include "tunnel.h" |
| |
| #define TB_TIMEOUT 100 /* ms */ |
| #define TB_RELEASE_BW_TIMEOUT 10000 /* ms */ |
| |
| /* |
| * Minimum bandwidth (in Mb/s) that is needed in the single transmitter/receiver |
| * direction. This is 40G - 10% guard band bandwidth. |
| */ |
| #define TB_ASYM_MIN (40000 * 90 / 100) |
| |
| /* |
| * Threshold bandwidth (in Mb/s) that is used to switch the links to |
| * asymmetric and back. This is selected as 45G which means when the |
| * request is higher than this, we switch the link to asymmetric, and |
| * when it is less than this we switch it back. The 45G is selected so |
| * that we still have 27G (of the total 72G) for bulk PCIe traffic when |
| * switching back to symmetric. |
| */ |
| #define TB_ASYM_THRESHOLD 45000 |
| |
| #define MAX_GROUPS 7 /* max Group_ID is 7 */ |
| |
| static unsigned int asym_threshold = TB_ASYM_THRESHOLD; |
| module_param_named(asym_threshold, asym_threshold, uint, 0444); |
| MODULE_PARM_DESC(asym_threshold, |
| "threshold (Mb/s) when to Gen 4 switch link symmetry. 0 disables. (default: " |
| __MODULE_STRING(TB_ASYM_THRESHOLD) ")"); |
| |
| /** |
| * struct tb_cm - Simple Thunderbolt connection manager |
| * @tunnel_list: List of active tunnels |
| * @dp_resources: List of available DP resources for DP tunneling |
| * @hotplug_active: tb_handle_hotplug will stop progressing plug |
| * events and exit if this is not set (it needs to |
| * acquire the lock one more time). Used to drain wq |
| * after cfg has been paused. |
| * @remove_work: Work used to remove any unplugged routers after |
| * runtime resume |
| * @groups: Bandwidth groups used in this domain. |
| */ |
| struct tb_cm { |
| struct list_head tunnel_list; |
| struct list_head dp_resources; |
| bool hotplug_active; |
| struct delayed_work remove_work; |
| struct tb_bandwidth_group groups[MAX_GROUPS]; |
| }; |
| |
| static inline struct tb *tcm_to_tb(struct tb_cm *tcm) |
| { |
| return ((void *)tcm - sizeof(struct tb)); |
| } |
| |
| struct tb_hotplug_event { |
| struct work_struct work; |
| struct tb *tb; |
| u64 route; |
| u8 port; |
| bool unplug; |
| }; |
| |
| static void tb_handle_hotplug(struct work_struct *work); |
| |
| static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) |
| { |
| struct tb_hotplug_event *ev; |
| |
| ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
| if (!ev) |
| return; |
| |
| ev->tb = tb; |
| ev->route = route; |
| ev->port = port; |
| ev->unplug = unplug; |
| INIT_WORK(&ev->work, tb_handle_hotplug); |
| queue_work(tb->wq, &ev->work); |
| } |
| |
| /* enumeration & hot plug handling */ |
| |
| static void tb_add_dp_resources(struct tb_switch *sw) |
| { |
| struct tb_cm *tcm = tb_priv(sw->tb); |
| struct tb_port *port; |
| |
| tb_switch_for_each_port(sw, port) { |
| if (!tb_port_is_dpin(port)) |
| continue; |
| |
| if (!tb_switch_query_dp_resource(sw, port)) |
| continue; |
| |
| /* |
| * If DP IN on device router exist, position it at the |
| * beginning of the DP resources list, so that it is used |
| * before DP IN of the host router. This way external GPU(s) |
| * will be prioritized when pairing DP IN to a DP OUT. |
| */ |
| if (tb_route(sw)) |
| list_add(&port->list, &tcm->dp_resources); |
| else |
| list_add_tail(&port->list, &tcm->dp_resources); |
| |
| tb_port_dbg(port, "DP IN resource available\n"); |
| } |
| } |
| |
| static void tb_remove_dp_resources(struct tb_switch *sw) |
| { |
| struct tb_cm *tcm = tb_priv(sw->tb); |
| struct tb_port *port, *tmp; |
| |
| /* Clear children resources first */ |
| tb_switch_for_each_port(sw, port) { |
| if (tb_port_has_remote(port)) |
| tb_remove_dp_resources(port->remote->sw); |
| } |
| |
| list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { |
| if (port->sw == sw) { |
| tb_port_dbg(port, "DP OUT resource unavailable\n"); |
| list_del_init(&port->list); |
| } |
| } |
| } |
| |
| static void tb_discover_dp_resource(struct tb *tb, struct tb_port *port) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_port *p; |
| |
| list_for_each_entry(p, &tcm->dp_resources, list) { |
| if (p == port) |
| return; |
| } |
| |
| tb_port_dbg(port, "DP %s resource available discovered\n", |
| tb_port_is_dpin(port) ? "IN" : "OUT"); |
| list_add_tail(&port->list, &tcm->dp_resources); |
| } |
| |
| static void tb_discover_dp_resources(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_dp(tunnel)) |
| tb_discover_dp_resource(tb, tunnel->dst_port); |
| } |
| } |
| |
| /* Enables CL states up to host router */ |
| static int tb_enable_clx(struct tb_switch *sw) |
| { |
| struct tb_cm *tcm = tb_priv(sw->tb); |
| unsigned int clx = TB_CL0S | TB_CL1; |
| const struct tb_tunnel *tunnel; |
| int ret; |
| |
| /* |
| * Currently only enable CLx for the first link. This is enough |
| * to allow the CPU to save energy at least on Intel hardware |
| * and makes it slightly simpler to implement. We may change |
| * this in the future to cover the whole topology if it turns |
| * out to be beneficial. |
| */ |
| while (sw && tb_switch_depth(sw) > 1) |
| sw = tb_switch_parent(sw); |
| |
| if (!sw) |
| return 0; |
| |
| if (tb_switch_depth(sw) != 1) |
| return 0; |
| |
| /* |
| * If we are re-enabling then check if there is an active DMA |
| * tunnel and in that case bail out. |
| */ |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_dma(tunnel)) { |
| if (tb_tunnel_port_on_path(tunnel, tb_upstream_port(sw))) |
| return 0; |
| } |
| } |
| |
| /* |
| * Initially try with CL2. If that's not supported by the |
| * topology try with CL0s and CL1 and then give up. |
| */ |
| ret = tb_switch_clx_enable(sw, clx | TB_CL2); |
| if (ret == -EOPNOTSUPP) |
| ret = tb_switch_clx_enable(sw, clx); |
| return ret == -EOPNOTSUPP ? 0 : ret; |
| } |
| |
| /** |
| * tb_disable_clx() - Disable CL states up to host router |
| * @sw: Router to start |
| * |
| * Disables CL states from @sw up to the host router. Returns true if |
| * any CL state were disabled. This can be used to figure out whether |
| * the link was setup by us or the boot firmware so we don't |
| * accidentally enable them if they were not enabled during discovery. |
| */ |
| static bool tb_disable_clx(struct tb_switch *sw) |
| { |
| bool disabled = false; |
| |
| do { |
| int ret; |
| |
| ret = tb_switch_clx_disable(sw); |
| if (ret > 0) |
| disabled = true; |
| else if (ret < 0) |
| tb_sw_warn(sw, "failed to disable CL states\n"); |
| |
| sw = tb_switch_parent(sw); |
| } while (sw); |
| |
| return disabled; |
| } |
| |
| static int tb_increase_switch_tmu_accuracy(struct device *dev, void *data) |
| { |
| struct tb_switch *sw; |
| |
| sw = tb_to_switch(dev); |
| if (!sw) |
| return 0; |
| |
| if (tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_LOWRES)) { |
| enum tb_switch_tmu_mode mode; |
| int ret; |
| |
| if (tb_switch_clx_is_enabled(sw, TB_CL1)) |
| mode = TB_SWITCH_TMU_MODE_HIFI_UNI; |
| else |
| mode = TB_SWITCH_TMU_MODE_HIFI_BI; |
| |
| ret = tb_switch_tmu_configure(sw, mode); |
| if (ret) |
| return ret; |
| |
| return tb_switch_tmu_enable(sw); |
| } |
| |
| return 0; |
| } |
| |
| static void tb_increase_tmu_accuracy(struct tb_tunnel *tunnel) |
| { |
| struct tb_switch *sw; |
| |
| if (!tunnel) |
| return; |
| |
| /* |
| * Once first DP tunnel is established we change the TMU |
| * accuracy of first depth child routers (and the host router) |
| * to the highest. This is needed for the DP tunneling to work |
| * but also allows CL0s. |
| * |
| * If both routers are v2 then we don't need to do anything as |
| * they are using enhanced TMU mode that allows all CLx. |
| */ |
| sw = tunnel->tb->root_switch; |
| device_for_each_child(&sw->dev, NULL, tb_increase_switch_tmu_accuracy); |
| } |
| |
| static int tb_enable_tmu(struct tb_switch *sw) |
| { |
| int ret; |
| |
| /* |
| * If both routers at the end of the link are v2 we simply |
| * enable the enhanched uni-directional mode. That covers all |
| * the CL states. For v1 and before we need to use the normal |
| * rate to allow CL1 (when supported). Otherwise we keep the TMU |
| * running at the highest accuracy. |
| */ |
| ret = tb_switch_tmu_configure(sw, |
| TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI); |
| if (ret == -EOPNOTSUPP) { |
| if (tb_switch_clx_is_enabled(sw, TB_CL1)) |
| ret = tb_switch_tmu_configure(sw, |
| TB_SWITCH_TMU_MODE_LOWRES); |
| else |
| ret = tb_switch_tmu_configure(sw, |
| TB_SWITCH_TMU_MODE_HIFI_BI); |
| } |
| if (ret) |
| return ret; |
| |
| /* If it is already enabled in correct mode, don't touch it */ |
| if (tb_switch_tmu_is_enabled(sw)) |
| return 0; |
| |
| ret = tb_switch_tmu_disable(sw); |
| if (ret) |
| return ret; |
| |
| ret = tb_switch_tmu_post_time(sw); |
| if (ret) |
| return ret; |
| |
| return tb_switch_tmu_enable(sw); |
| } |
| |
| static void tb_switch_discover_tunnels(struct tb_switch *sw, |
| struct list_head *list, |
| bool alloc_hopids) |
| { |
| struct tb *tb = sw->tb; |
| struct tb_port *port; |
| |
| tb_switch_for_each_port(sw, port) { |
| struct tb_tunnel *tunnel = NULL; |
| |
| switch (port->config.type) { |
| case TB_TYPE_DP_HDMI_IN: |
| tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids); |
| tb_increase_tmu_accuracy(tunnel); |
| break; |
| |
| case TB_TYPE_PCIE_DOWN: |
| tunnel = tb_tunnel_discover_pci(tb, port, alloc_hopids); |
| break; |
| |
| case TB_TYPE_USB3_DOWN: |
| tunnel = tb_tunnel_discover_usb3(tb, port, alloc_hopids); |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (tunnel) |
| list_add_tail(&tunnel->list, list); |
| } |
| |
| tb_switch_for_each_port(sw, port) { |
| if (tb_port_has_remote(port)) { |
| tb_switch_discover_tunnels(port->remote->sw, list, |
| alloc_hopids); |
| } |
| } |
| } |
| |
| static int tb_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd) |
| { |
| if (tb_switch_is_usb4(port->sw)) |
| return usb4_port_configure_xdomain(port, xd); |
| return tb_lc_configure_xdomain(port); |
| } |
| |
| static void tb_port_unconfigure_xdomain(struct tb_port *port) |
| { |
| if (tb_switch_is_usb4(port->sw)) |
| usb4_port_unconfigure_xdomain(port); |
| else |
| tb_lc_unconfigure_xdomain(port); |
| } |
| |
| static void tb_scan_xdomain(struct tb_port *port) |
| { |
| struct tb_switch *sw = port->sw; |
| struct tb *tb = sw->tb; |
| struct tb_xdomain *xd; |
| u64 route; |
| |
| if (!tb_is_xdomain_enabled()) |
| return; |
| |
| route = tb_downstream_route(port); |
| xd = tb_xdomain_find_by_route(tb, route); |
| if (xd) { |
| tb_xdomain_put(xd); |
| return; |
| } |
| |
| xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid, |
| NULL); |
| if (xd) { |
| tb_port_at(route, sw)->xdomain = xd; |
| tb_port_configure_xdomain(port, xd); |
| tb_xdomain_add(xd); |
| } |
| } |
| |
| /** |
| * tb_find_unused_port() - return the first inactive port on @sw |
| * @sw: Switch to find the port on |
| * @type: Port type to look for |
| */ |
| static struct tb_port *tb_find_unused_port(struct tb_switch *sw, |
| enum tb_port_type type) |
| { |
| struct tb_port *port; |
| |
| tb_switch_for_each_port(sw, port) { |
| if (tb_is_upstream_port(port)) |
| continue; |
| if (port->config.type != type) |
| continue; |
| if (!port->cap_adap) |
| continue; |
| if (tb_port_is_enabled(port)) |
| continue; |
| return port; |
| } |
| return NULL; |
| } |
| |
| static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, |
| const struct tb_port *port) |
| { |
| struct tb_port *down; |
| |
| down = usb4_switch_map_usb3_down(sw, port); |
| if (down && !tb_usb3_port_is_enabled(down)) |
| return down; |
| return NULL; |
| } |
| |
| static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, |
| struct tb_port *src_port, |
| struct tb_port *dst_port) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (tunnel->type == type && |
| ((src_port && src_port == tunnel->src_port) || |
| (dst_port && dst_port == tunnel->dst_port))) { |
| return tunnel; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, |
| struct tb_port *src_port, |
| struct tb_port *dst_port) |
| { |
| struct tb_port *port, *usb3_down; |
| struct tb_switch *sw; |
| |
| /* Pick the router that is deepest in the topology */ |
| if (tb_port_path_direction_downstream(src_port, dst_port)) |
| sw = dst_port->sw; |
| else |
| sw = src_port->sw; |
| |
| /* Can't be the host router */ |
| if (sw == tb->root_switch) |
| return NULL; |
| |
| /* Find the downstream USB4 port that leads to this router */ |
| port = tb_port_at(tb_route(sw), tb->root_switch); |
| /* Find the corresponding host router USB3 downstream port */ |
| usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); |
| if (!usb3_down) |
| return NULL; |
| |
| return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); |
| } |
| |
| /** |
| * tb_consumed_usb3_pcie_bandwidth() - Consumed USB3/PCIe bandwidth over a single link |
| * @tb: Domain structure |
| * @src_port: Source protocol adapter |
| * @dst_port: Destination protocol adapter |
| * @port: USB4 port the consumed bandwidth is calculated |
| * @consumed_up: Consumed upsream bandwidth (Mb/s) |
| * @consumed_down: Consumed downstream bandwidth (Mb/s) |
| * |
| * Calculates consumed USB3 and PCIe bandwidth at @port between path |
| * from @src_port to @dst_port. Does not take USB3 tunnel starting from |
| * @src_port and ending on @src_port into account because that bandwidth is |
| * already included in as part of the "first hop" USB3 tunnel. |
| */ |
| static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb, |
| struct tb_port *src_port, |
| struct tb_port *dst_port, |
| struct tb_port *port, |
| int *consumed_up, |
| int *consumed_down) |
| { |
| int pci_consumed_up, pci_consumed_down; |
| struct tb_tunnel *tunnel; |
| |
| *consumed_up = *consumed_down = 0; |
| |
| tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); |
| if (tunnel && !tb_port_is_usb3_down(src_port) && |
| !tb_port_is_usb3_up(dst_port)) { |
| int ret; |
| |
| ret = tb_tunnel_consumed_bandwidth(tunnel, consumed_up, |
| consumed_down); |
| if (ret) |
| return ret; |
| } |
| |
| /* |
| * If there is anything reserved for PCIe bulk traffic take it |
| * into account here too. |
| */ |
| if (tb_tunnel_reserved_pci(port, &pci_consumed_up, &pci_consumed_down)) { |
| *consumed_up += pci_consumed_up; |
| *consumed_down += pci_consumed_down; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tb_consumed_dp_bandwidth() - Consumed DP bandwidth over a single link |
| * @tb: Domain structure |
| * @src_port: Source protocol adapter |
| * @dst_port: Destination protocol adapter |
| * @port: USB4 port the consumed bandwidth is calculated |
| * @consumed_up: Consumed upsream bandwidth (Mb/s) |
| * @consumed_down: Consumed downstream bandwidth (Mb/s) |
| * |
| * Calculates consumed DP bandwidth at @port between path from @src_port |
| * to @dst_port. Does not take tunnel starting from @src_port and ending |
| * from @src_port into account. |
| * |
| * If there is bandwidth reserved for any of the groups between |
| * @src_port and @dst_port (but not yet used) that is also taken into |
| * account in the returned consumed bandwidth. |
| */ |
| static int tb_consumed_dp_bandwidth(struct tb *tb, |
| struct tb_port *src_port, |
| struct tb_port *dst_port, |
| struct tb_port *port, |
| int *consumed_up, |
| int *consumed_down) |
| { |
| int group_reserved[MAX_GROUPS] = {}; |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| bool downstream; |
| int i, ret; |
| |
| *consumed_up = *consumed_down = 0; |
| |
| /* |
| * Find all DP tunnels that cross the port and reduce |
| * their consumed bandwidth from the available. |
| */ |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| const struct tb_bandwidth_group *group; |
| int dp_consumed_up, dp_consumed_down; |
| |
| if (tb_tunnel_is_invalid(tunnel)) |
| continue; |
| |
| if (!tb_tunnel_is_dp(tunnel)) |
| continue; |
| |
| if (!tb_tunnel_port_on_path(tunnel, port)) |
| continue; |
| |
| /* |
| * Calculate what is reserved for groups crossing the |
| * same ports only once (as that is reserved for all the |
| * tunnels in the group). |
| */ |
| group = tunnel->src_port->group; |
| if (group && group->reserved && !group_reserved[group->index]) |
| group_reserved[group->index] = group->reserved; |
| |
| /* |
| * Ignore the DP tunnel between src_port and dst_port |
| * because it is the same tunnel and we may be |
| * re-calculating estimated bandwidth. |
| */ |
| if (tunnel->src_port == src_port && |
| tunnel->dst_port == dst_port) |
| continue; |
| |
| ret = tb_tunnel_consumed_bandwidth(tunnel, &dp_consumed_up, |
| &dp_consumed_down); |
| if (ret) |
| return ret; |
| |
| *consumed_up += dp_consumed_up; |
| *consumed_down += dp_consumed_down; |
| } |
| |
| downstream = tb_port_path_direction_downstream(src_port, dst_port); |
| for (i = 0; i < ARRAY_SIZE(group_reserved); i++) { |
| if (downstream) |
| *consumed_down += group_reserved[i]; |
| else |
| *consumed_up += group_reserved[i]; |
| } |
| |
| return 0; |
| } |
| |
| static bool tb_asym_supported(struct tb_port *src_port, struct tb_port *dst_port, |
| struct tb_port *port) |
| { |
| bool downstream = tb_port_path_direction_downstream(src_port, dst_port); |
| enum tb_link_width width; |
| |
| if (tb_is_upstream_port(port)) |
| width = downstream ? TB_LINK_WIDTH_ASYM_RX : TB_LINK_WIDTH_ASYM_TX; |
| else |
| width = downstream ? TB_LINK_WIDTH_ASYM_TX : TB_LINK_WIDTH_ASYM_RX; |
| |
| return tb_port_width_supported(port, width); |
| } |
| |
| /** |
| * tb_maximum_bandwidth() - Maximum bandwidth over a single link |
| * @tb: Domain structure |
| * @src_port: Source protocol adapter |
| * @dst_port: Destination protocol adapter |
| * @port: USB4 port the total bandwidth is calculated |
| * @max_up: Maximum upstream bandwidth (Mb/s) |
| * @max_down: Maximum downstream bandwidth (Mb/s) |
| * @include_asym: Include bandwidth if the link is switched from |
| * symmetric to asymmetric |
| * |
| * Returns maximum possible bandwidth in @max_up and @max_down over a |
| * single link at @port. If @include_asym is set then includes the |
| * additional banwdith if the links are transitioned into asymmetric to |
| * direction from @src_port to @dst_port. |
| */ |
| static int tb_maximum_bandwidth(struct tb *tb, struct tb_port *src_port, |
| struct tb_port *dst_port, struct tb_port *port, |
| int *max_up, int *max_down, bool include_asym) |
| { |
| bool downstream = tb_port_path_direction_downstream(src_port, dst_port); |
| int link_speed, link_width, up_bw, down_bw; |
| |
| /* |
| * Can include asymmetric, only if it is actually supported by |
| * the lane adapter. |
| */ |
| if (!tb_asym_supported(src_port, dst_port, port)) |
| include_asym = false; |
| |
| if (tb_is_upstream_port(port)) { |
| link_speed = port->sw->link_speed; |
| /* |
| * sw->link_width is from upstream perspective so we use |
| * the opposite for downstream of the host router. |
| */ |
| if (port->sw->link_width == TB_LINK_WIDTH_ASYM_TX) { |
| up_bw = link_speed * 3 * 1000; |
| down_bw = link_speed * 1 * 1000; |
| } else if (port->sw->link_width == TB_LINK_WIDTH_ASYM_RX) { |
| up_bw = link_speed * 1 * 1000; |
| down_bw = link_speed * 3 * 1000; |
| } else if (include_asym) { |
| /* |
| * The link is symmetric at the moment but we |
| * can switch it to asymmetric as needed. Report |
| * this bandwidth as available (even though it |
| * is not yet enabled). |
| */ |
| if (downstream) { |
| up_bw = link_speed * 1 * 1000; |
| down_bw = link_speed * 3 * 1000; |
| } else { |
| up_bw = link_speed * 3 * 1000; |
| down_bw = link_speed * 1 * 1000; |
| } |
| } else { |
| up_bw = link_speed * port->sw->link_width * 1000; |
| down_bw = up_bw; |
| } |
| } else { |
| link_speed = tb_port_get_link_speed(port); |
| if (link_speed < 0) |
| return link_speed; |
| |
| link_width = tb_port_get_link_width(port); |
| if (link_width < 0) |
| return link_width; |
| |
| if (link_width == TB_LINK_WIDTH_ASYM_TX) { |
| up_bw = link_speed * 1 * 1000; |
| down_bw = link_speed * 3 * 1000; |
| } else if (link_width == TB_LINK_WIDTH_ASYM_RX) { |
| up_bw = link_speed * 3 * 1000; |
| down_bw = link_speed * 1 * 1000; |
| } else if (include_asym) { |
| /* |
| * The link is symmetric at the moment but we |
| * can switch it to asymmetric as needed. Report |
| * this bandwidth as available (even though it |
| * is not yet enabled). |
| */ |
| if (downstream) { |
| up_bw = link_speed * 1 * 1000; |
| down_bw = link_speed * 3 * 1000; |
| } else { |
| up_bw = link_speed * 3 * 1000; |
| down_bw = link_speed * 1 * 1000; |
| } |
| } else { |
| up_bw = link_speed * link_width * 1000; |
| down_bw = up_bw; |
| } |
| } |
| |
| /* Leave 10% guard band */ |
| *max_up = up_bw - up_bw / 10; |
| *max_down = down_bw - down_bw / 10; |
| |
| tb_port_dbg(port, "link maximum bandwidth %d/%d Mb/s\n", *max_up, *max_down); |
| return 0; |
| } |
| |
| /** |
| * tb_available_bandwidth() - Available bandwidth for tunneling |
| * @tb: Domain structure |
| * @src_port: Source protocol adapter |
| * @dst_port: Destination protocol adapter |
| * @available_up: Available bandwidth upstream (Mb/s) |
| * @available_down: Available bandwidth downstream (Mb/s) |
| * @include_asym: Include bandwidth if the link is switched from |
| * symmetric to asymmetric |
| * |
| * Calculates maximum available bandwidth for protocol tunneling between |
| * @src_port and @dst_port at the moment. This is minimum of maximum |
| * link bandwidth across all links reduced by currently consumed |
| * bandwidth on that link. |
| * |
| * If @include_asym is true then includes also bandwidth that can be |
| * added when the links are transitioned into asymmetric (but does not |
| * transition the links). |
| */ |
| static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, |
| struct tb_port *dst_port, int *available_up, |
| int *available_down, bool include_asym) |
| { |
| struct tb_port *port; |
| int ret; |
| |
| /* Maximum possible bandwidth asymmetric Gen 4 link is 120 Gb/s */ |
| *available_up = *available_down = 120000; |
| |
| /* Find the minimum available bandwidth over all links */ |
| tb_for_each_port_on_path(src_port, dst_port, port) { |
| int max_up, max_down, consumed_up, consumed_down; |
| |
| if (!tb_port_is_null(port)) |
| continue; |
| |
| ret = tb_maximum_bandwidth(tb, src_port, dst_port, port, |
| &max_up, &max_down, include_asym); |
| if (ret) |
| return ret; |
| |
| ret = tb_consumed_usb3_pcie_bandwidth(tb, src_port, dst_port, |
| port, &consumed_up, |
| &consumed_down); |
| if (ret) |
| return ret; |
| max_up -= consumed_up; |
| max_down -= consumed_down; |
| |
| ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, port, |
| &consumed_up, &consumed_down); |
| if (ret) |
| return ret; |
| max_up -= consumed_up; |
| max_down -= consumed_down; |
| |
| if (max_up < *available_up) |
| *available_up = max_up; |
| if (max_down < *available_down) |
| *available_down = max_down; |
| } |
| |
| if (*available_up < 0) |
| *available_up = 0; |
| if (*available_down < 0) |
| *available_down = 0; |
| |
| return 0; |
| } |
| |
| static int tb_release_unused_usb3_bandwidth(struct tb *tb, |
| struct tb_port *src_port, |
| struct tb_port *dst_port) |
| { |
| struct tb_tunnel *tunnel; |
| |
| tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); |
| return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0; |
| } |
| |
| static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, |
| struct tb_port *dst_port) |
| { |
| int ret, available_up, available_down; |
| struct tb_tunnel *tunnel; |
| |
| tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); |
| if (!tunnel) |
| return; |
| |
| tb_tunnel_dbg(tunnel, "reclaiming unused bandwidth\n"); |
| |
| /* |
| * Calculate available bandwidth for the first hop USB3 tunnel. |
| * That determines the whole USB3 bandwidth for this branch. |
| */ |
| ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port, |
| &available_up, &available_down, false); |
| if (ret) { |
| tb_tunnel_warn(tunnel, "failed to calculate available bandwidth\n"); |
| return; |
| } |
| |
| tb_tunnel_dbg(tunnel, "available bandwidth %d/%d Mb/s\n", available_up, |
| available_down); |
| |
| tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down); |
| } |
| |
| static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) |
| { |
| struct tb_switch *parent = tb_switch_parent(sw); |
| int ret, available_up, available_down; |
| struct tb_port *up, *down, *port; |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| |
| if (!tb_acpi_may_tunnel_usb3()) { |
| tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n"); |
| return 0; |
| } |
| |
| up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); |
| if (!up) |
| return 0; |
| |
| if (!sw->link_usb4) |
| return 0; |
| |
| /* |
| * Look up available down port. Since we are chaining it should |
| * be found right above this switch. |
| */ |
| port = tb_switch_downstream_port(sw); |
| down = tb_find_usb3_down(parent, port); |
| if (!down) |
| return 0; |
| |
| if (tb_route(parent)) { |
| struct tb_port *parent_up; |
| /* |
| * Check first that the parent switch has its upstream USB3 |
| * port enabled. Otherwise the chain is not complete and |
| * there is no point setting up a new tunnel. |
| */ |
| parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); |
| if (!parent_up || !tb_port_is_enabled(parent_up)) |
| return 0; |
| |
| /* Make all unused bandwidth available for the new tunnel */ |
| ret = tb_release_unused_usb3_bandwidth(tb, down, up); |
| if (ret) |
| return ret; |
| } |
| |
| ret = tb_available_bandwidth(tb, down, up, &available_up, &available_down, |
| false); |
| if (ret) |
| goto err_reclaim; |
| |
| tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n", |
| available_up, available_down); |
| |
| tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up, |
| available_down); |
| if (!tunnel) { |
| ret = -ENOMEM; |
| goto err_reclaim; |
| } |
| |
| if (tb_tunnel_activate(tunnel)) { |
| tb_port_info(up, |
| "USB3 tunnel activation failed, aborting\n"); |
| ret = -EIO; |
| goto err_free; |
| } |
| |
| list_add_tail(&tunnel->list, &tcm->tunnel_list); |
| if (tb_route(parent)) |
| tb_reclaim_usb3_bandwidth(tb, down, up); |
| |
| return 0; |
| |
| err_free: |
| tb_tunnel_free(tunnel); |
| err_reclaim: |
| if (tb_route(parent)) |
| tb_reclaim_usb3_bandwidth(tb, down, up); |
| |
| return ret; |
| } |
| |
| static int tb_create_usb3_tunnels(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| int ret; |
| |
| if (!tb_acpi_may_tunnel_usb3()) |
| return 0; |
| |
| if (tb_route(sw)) { |
| ret = tb_tunnel_usb3(sw->tb, sw); |
| if (ret) |
| return ret; |
| } |
| |
| tb_switch_for_each_port(sw, port) { |
| if (!tb_port_has_remote(port)) |
| continue; |
| ret = tb_create_usb3_tunnels(port->remote->sw); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tb_configure_asym() - Transition links to asymmetric if needed |
| * @tb: Domain structure |
| * @src_port: Source adapter to start the transition |
| * @dst_port: Destination adapter |
| * @requested_up: Additional bandwidth (Mb/s) required upstream |
| * @requested_down: Additional bandwidth (Mb/s) required downstream |
| * |
| * Transition links between @src_port and @dst_port into asymmetric, with |
| * three lanes in the direction from @src_port towards @dst_port and one lane |
| * in the opposite direction, if the bandwidth requirements |
| * (requested + currently consumed) on that link exceed @asym_threshold. |
| * |
| * Must be called with available >= requested over all links. |
| */ |
| static int tb_configure_asym(struct tb *tb, struct tb_port *src_port, |
| struct tb_port *dst_port, int requested_up, |
| int requested_down) |
| { |
| bool clx = false, clx_disabled = false, downstream; |
| struct tb_switch *sw; |
| struct tb_port *up; |
| int ret = 0; |
| |
| if (!asym_threshold) |
| return 0; |
| |
| downstream = tb_port_path_direction_downstream(src_port, dst_port); |
| /* Pick up router deepest in the hierarchy */ |
| if (downstream) |
| sw = dst_port->sw; |
| else |
| sw = src_port->sw; |
| |
| tb_for_each_upstream_port_on_path(src_port, dst_port, up) { |
| struct tb_port *down = tb_switch_downstream_port(up->sw); |
| enum tb_link_width width_up, width_down; |
| int consumed_up, consumed_down; |
| |
| ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, up, |
| &consumed_up, &consumed_down); |
| if (ret) |
| break; |
| |
| if (downstream) { |
| /* |
| * Downstream so make sure upstream is within the 36G |
| * (40G - guard band 10%), and the requested is above |
| * what the threshold is. |
| */ |
| if (consumed_up + requested_up >= TB_ASYM_MIN) { |
| ret = -ENOBUFS; |
| break; |
| } |
| /* Does consumed + requested exceed the threshold */ |
| if (consumed_down + requested_down < asym_threshold) |
| continue; |
| |
| width_up = TB_LINK_WIDTH_ASYM_RX; |
| width_down = TB_LINK_WIDTH_ASYM_TX; |
| } else { |
| /* Upstream, the opposite of above */ |
| if (consumed_down + requested_down >= TB_ASYM_MIN) { |
| ret = -ENOBUFS; |
| break; |
| } |
| if (consumed_up + requested_up < asym_threshold) |
| continue; |
| |
| width_up = TB_LINK_WIDTH_ASYM_TX; |
| width_down = TB_LINK_WIDTH_ASYM_RX; |
| } |
| |
| if (up->sw->link_width == width_up) |
| continue; |
| |
| if (!tb_port_width_supported(up, width_up) || |
| !tb_port_width_supported(down, width_down)) |
| continue; |
| |
| /* |
| * Disable CL states before doing any transitions. We |
| * delayed it until now that we know there is a real |
| * transition taking place. |
| */ |
| if (!clx_disabled) { |
| clx = tb_disable_clx(sw); |
| clx_disabled = true; |
| } |
| |
| tb_sw_dbg(up->sw, "configuring asymmetric link\n"); |
| |
| /* |
| * Here requested + consumed > threshold so we need to |
| * transtion the link into asymmetric now. |
| */ |
| ret = tb_switch_set_link_width(up->sw, width_up); |
| if (ret) { |
| tb_sw_warn(up->sw, "failed to set link width\n"); |
| break; |
| } |
| } |
| |
| /* Re-enable CL states if they were previosly enabled */ |
| if (clx) |
| tb_enable_clx(sw); |
| |
| return ret; |
| } |
| |
| /** |
| * tb_configure_sym() - Transition links to symmetric if possible |
| * @tb: Domain structure |
| * @src_port: Source adapter to start the transition |
| * @dst_port: Destination adapter |
| * @keep_asym: Keep asymmetric link if preferred |
| * |
| * Goes over each link from @src_port to @dst_port and tries to |
| * transition the link to symmetric if the currently consumed bandwidth |
| * allows and link asymmetric preference is ignored (if @keep_asym is %false). |
| */ |
| static int tb_configure_sym(struct tb *tb, struct tb_port *src_port, |
| struct tb_port *dst_port, bool keep_asym) |
| { |
| bool clx = false, clx_disabled = false, downstream; |
| struct tb_switch *sw; |
| struct tb_port *up; |
| int ret = 0; |
| |
| if (!asym_threshold) |
| return 0; |
| |
| downstream = tb_port_path_direction_downstream(src_port, dst_port); |
| /* Pick up router deepest in the hierarchy */ |
| if (downstream) |
| sw = dst_port->sw; |
| else |
| sw = src_port->sw; |
| |
| tb_for_each_upstream_port_on_path(src_port, dst_port, up) { |
| int consumed_up, consumed_down; |
| |
| /* Already symmetric */ |
| if (up->sw->link_width <= TB_LINK_WIDTH_DUAL) |
| continue; |
| /* Unplugged, no need to switch */ |
| if (up->sw->is_unplugged) |
| continue; |
| |
| ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, up, |
| &consumed_up, &consumed_down); |
| if (ret) |
| break; |
| |
| if (downstream) { |
| /* |
| * Downstream so we want the consumed_down < threshold. |
| * Upstream traffic should be less than 36G (40G |
| * guard band 10%) as the link was configured asymmetric |
| * already. |
| */ |
| if (consumed_down >= asym_threshold) |
| continue; |
| } else { |
| if (consumed_up >= asym_threshold) |
| continue; |
| } |
| |
| if (up->sw->link_width == TB_LINK_WIDTH_DUAL) |
| continue; |
| |
| /* |
| * Here consumed < threshold so we can transition the |
| * link to symmetric. |
| * |
| * However, if the router prefers asymmetric link we |
| * honor that (unless @keep_asym is %false). |
| */ |
| if (keep_asym && |
| up->sw->preferred_link_width > TB_LINK_WIDTH_DUAL) { |
| tb_sw_dbg(up->sw, "keeping preferred asymmetric link\n"); |
| continue; |
| } |
| |
| /* Disable CL states before doing any transitions */ |
| if (!clx_disabled) { |
| clx = tb_disable_clx(sw); |
| clx_disabled = true; |
| } |
| |
| tb_sw_dbg(up->sw, "configuring symmetric link\n"); |
| |
| ret = tb_switch_set_link_width(up->sw, TB_LINK_WIDTH_DUAL); |
| if (ret) { |
| tb_sw_warn(up->sw, "failed to set link width\n"); |
| break; |
| } |
| } |
| |
| /* Re-enable CL states if they were previosly enabled */ |
| if (clx) |
| tb_enable_clx(sw); |
| |
| return ret; |
| } |
| |
| static void tb_configure_link(struct tb_port *down, struct tb_port *up, |
| struct tb_switch *sw) |
| { |
| struct tb *tb = sw->tb; |
| |
| /* Link the routers using both links if available */ |
| down->remote = up; |
| up->remote = down; |
| if (down->dual_link_port && up->dual_link_port) { |
| down->dual_link_port->remote = up->dual_link_port; |
| up->dual_link_port->remote = down->dual_link_port; |
| } |
| |
| /* |
| * Enable lane bonding if the link is currently two single lane |
| * links. |
| */ |
| if (sw->link_width < TB_LINK_WIDTH_DUAL) |
| tb_switch_set_link_width(sw, TB_LINK_WIDTH_DUAL); |
| |
| /* |
| * Device router that comes up as symmetric link is |
| * connected deeper in the hierarchy, we transition the links |
| * above into symmetric if bandwidth allows. |
| */ |
| if (tb_switch_depth(sw) > 1 && |
| tb_port_get_link_generation(up) >= 4 && |
| up->sw->link_width == TB_LINK_WIDTH_DUAL) { |
| struct tb_port *host_port; |
| |
| host_port = tb_port_at(tb_route(sw), tb->root_switch); |
| tb_configure_sym(tb, host_port, up, false); |
| } |
| |
| /* Set the link configured */ |
| tb_switch_configure_link(sw); |
| } |
| |
| static void tb_scan_port(struct tb_port *port); |
| |
| /* |
| * tb_scan_switch() - scan for and initialize downstream switches |
| */ |
| static void tb_scan_switch(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| |
| pm_runtime_get_sync(&sw->dev); |
| |
| tb_switch_for_each_port(sw, port) |
| tb_scan_port(port); |
| |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| } |
| |
| /* |
| * tb_scan_port() - check for and initialize switches below port |
| */ |
| static void tb_scan_port(struct tb_port *port) |
| { |
| struct tb_cm *tcm = tb_priv(port->sw->tb); |
| struct tb_port *upstream_port; |
| bool discovery = false; |
| struct tb_switch *sw; |
| |
| if (tb_is_upstream_port(port)) |
| return; |
| |
| if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && |
| !tb_dp_port_is_enabled(port)) { |
| tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); |
| tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, |
| false); |
| return; |
| } |
| |
| if (port->config.type != TB_TYPE_PORT) |
| return; |
| if (port->dual_link_port && port->link_nr) |
| return; /* |
| * Downstream switch is reachable through two ports. |
| * Only scan on the primary port (link_nr == 0). |
| */ |
| |
| if (port->usb4) |
| pm_runtime_get_sync(&port->usb4->dev); |
| |
| if (tb_wait_for_port(port, false) <= 0) |
| goto out_rpm_put; |
| if (port->remote) { |
| tb_port_dbg(port, "port already has a remote\n"); |
| goto out_rpm_put; |
| } |
| |
| tb_retimer_scan(port, true); |
| |
| sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, |
| tb_downstream_route(port)); |
| if (IS_ERR(sw)) { |
| /* |
| * If there is an error accessing the connected switch |
| * it may be connected to another domain. Also we allow |
| * the other domain to be connected to a max depth switch. |
| */ |
| if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) |
| tb_scan_xdomain(port); |
| goto out_rpm_put; |
| } |
| |
| if (tb_switch_configure(sw)) { |
| tb_switch_put(sw); |
| goto out_rpm_put; |
| } |
| |
| /* |
| * If there was previously another domain connected remove it |
| * first. |
| */ |
| if (port->xdomain) { |
| tb_xdomain_remove(port->xdomain); |
| tb_port_unconfigure_xdomain(port); |
| port->xdomain = NULL; |
| } |
| |
| /* |
| * Do not send uevents until we have discovered all existing |
| * tunnels and know which switches were authorized already by |
| * the boot firmware. |
| */ |
| if (!tcm->hotplug_active) { |
| dev_set_uevent_suppress(&sw->dev, true); |
| discovery = true; |
| } |
| |
| /* |
| * At the moment Thunderbolt 2 and beyond (devices with LC) we |
| * can support runtime PM. |
| */ |
| sw->rpm = sw->generation > 1; |
| |
| if (tb_switch_add(sw)) { |
| tb_switch_put(sw); |
| goto out_rpm_put; |
| } |
| |
| upstream_port = tb_upstream_port(sw); |
| tb_configure_link(port, upstream_port, sw); |
| |
| /* |
| * CL0s and CL1 are enabled and supported together. |
| * Silently ignore CLx enabling in case CLx is not supported. |
| */ |
| if (discovery) |
| tb_sw_dbg(sw, "discovery, not touching CL states\n"); |
| else if (tb_enable_clx(sw)) |
| tb_sw_warn(sw, "failed to enable CL states\n"); |
| |
| if (tb_enable_tmu(sw)) |
| tb_sw_warn(sw, "failed to enable TMU\n"); |
| |
| /* |
| * Configuration valid needs to be set after the TMU has been |
| * enabled for the upstream port of the router so we do it here. |
| */ |
| tb_switch_configuration_valid(sw); |
| |
| /* Scan upstream retimers */ |
| tb_retimer_scan(upstream_port, true); |
| |
| /* |
| * Create USB 3.x tunnels only when the switch is plugged to the |
| * domain. This is because we scan the domain also during discovery |
| * and want to discover existing USB 3.x tunnels before we create |
| * any new. |
| */ |
| if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) |
| tb_sw_warn(sw, "USB3 tunnel creation failed\n"); |
| |
| tb_add_dp_resources(sw); |
| tb_scan_switch(sw); |
| |
| out_rpm_put: |
| if (port->usb4) { |
| pm_runtime_mark_last_busy(&port->usb4->dev); |
| pm_runtime_put_autosuspend(&port->usb4->dev); |
| } |
| } |
| |
| static void |
| tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group) |
| { |
| struct tb_tunnel *first_tunnel; |
| struct tb *tb = group->tb; |
| struct tb_port *in; |
| int ret; |
| |
| tb_dbg(tb, "re-calculating bandwidth estimation for group %u\n", |
| group->index); |
| |
| first_tunnel = NULL; |
| list_for_each_entry(in, &group->ports, group_list) { |
| int estimated_bw, estimated_up, estimated_down; |
| struct tb_tunnel *tunnel; |
| struct tb_port *out; |
| |
| if (!usb4_dp_port_bandwidth_mode_enabled(in)) |
| continue; |
| |
| tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, NULL); |
| if (WARN_ON(!tunnel)) |
| break; |
| |
| if (!first_tunnel) { |
| /* |
| * Since USB3 bandwidth is shared by all DP |
| * tunnels under the host router USB4 port, even |
| * if they do not begin from the host router, we |
| * can release USB3 bandwidth just once and not |
| * for each tunnel separately. |
| */ |
| first_tunnel = tunnel; |
| ret = tb_release_unused_usb3_bandwidth(tb, |
| first_tunnel->src_port, first_tunnel->dst_port); |
| if (ret) { |
| tb_tunnel_warn(tunnel, |
| "failed to release unused bandwidth\n"); |
| break; |
| } |
| } |
| |
| out = tunnel->dst_port; |
| ret = tb_available_bandwidth(tb, in, out, &estimated_up, |
| &estimated_down, true); |
| if (ret) { |
| tb_tunnel_warn(tunnel, |
| "failed to re-calculate estimated bandwidth\n"); |
| break; |
| } |
| |
| /* |
| * Estimated bandwidth includes: |
| * - already allocated bandwidth for the DP tunnel |
| * - available bandwidth along the path |
| * - bandwidth allocated for USB 3.x but not used. |
| */ |
| if (tb_tunnel_direction_downstream(tunnel)) |
| estimated_bw = estimated_down; |
| else |
| estimated_bw = estimated_up; |
| |
| /* |
| * If there is reserved bandwidth for the group that is |
| * not yet released we report that too. |
| */ |
| tb_tunnel_dbg(tunnel, |
| "re-calculated estimated bandwidth %u (+ %u reserved) = %u Mb/s\n", |
| estimated_bw, group->reserved, |
| estimated_bw + group->reserved); |
| |
| if (usb4_dp_port_set_estimated_bandwidth(in, |
| estimated_bw + group->reserved)) |
| tb_tunnel_warn(tunnel, |
| "failed to update estimated bandwidth\n"); |
| } |
| |
| if (first_tunnel) |
| tb_reclaim_usb3_bandwidth(tb, first_tunnel->src_port, |
| first_tunnel->dst_port); |
| |
| tb_dbg(tb, "bandwidth estimation for group %u done\n", group->index); |
| } |
| |
| static void tb_recalc_estimated_bandwidth(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| int i; |
| |
| tb_dbg(tb, "bandwidth consumption changed, re-calculating estimated bandwidth\n"); |
| |
| for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { |
| struct tb_bandwidth_group *group = &tcm->groups[i]; |
| |
| if (!list_empty(&group->ports)) |
| tb_recalc_estimated_bandwidth_for_group(group); |
| } |
| |
| tb_dbg(tb, "bandwidth re-calculation done\n"); |
| } |
| |
| static bool __release_group_bandwidth(struct tb_bandwidth_group *group) |
| { |
| if (group->reserved) { |
| tb_dbg(group->tb, "group %d released total %d Mb/s\n", group->index, |
| group->reserved); |
| group->reserved = 0; |
| return true; |
| } |
| return false; |
| } |
| |
| static void __configure_group_sym(struct tb_bandwidth_group *group) |
| { |
| struct tb_tunnel *tunnel; |
| struct tb_port *in; |
| |
| if (list_empty(&group->ports)) |
| return; |
| |
| /* |
| * All the tunnels in the group go through the same USB4 links |
| * so we find the first one here and pass the IN and OUT |
| * adapters to tb_configure_sym() which now transitions the |
| * links back to symmetric if bandwidth requirement < asym_threshold. |
| * |
| * We do this here to avoid unnecessary transitions (for example |
| * if the graphics released bandwidth for other tunnel in the |
| * same group). |
| */ |
| in = list_first_entry(&group->ports, struct tb_port, group_list); |
| tunnel = tb_find_tunnel(group->tb, TB_TUNNEL_DP, in, NULL); |
| if (tunnel) |
| tb_configure_sym(group->tb, in, tunnel->dst_port, true); |
| } |
| |
| static void tb_bandwidth_group_release_work(struct work_struct *work) |
| { |
| struct tb_bandwidth_group *group = |
| container_of(work, typeof(*group), release_work.work); |
| struct tb *tb = group->tb; |
| |
| mutex_lock(&tb->lock); |
| if (__release_group_bandwidth(group)) |
| tb_recalc_estimated_bandwidth(tb); |
| __configure_group_sym(group); |
| mutex_unlock(&tb->lock); |
| } |
| |
| static void tb_init_bandwidth_groups(struct tb_cm *tcm) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { |
| struct tb_bandwidth_group *group = &tcm->groups[i]; |
| |
| group->tb = tcm_to_tb(tcm); |
| group->index = i + 1; |
| INIT_LIST_HEAD(&group->ports); |
| INIT_DELAYED_WORK(&group->release_work, |
| tb_bandwidth_group_release_work); |
| } |
| } |
| |
| static void tb_bandwidth_group_attach_port(struct tb_bandwidth_group *group, |
| struct tb_port *in) |
| { |
| if (!group || WARN_ON(in->group)) |
| return; |
| |
| in->group = group; |
| list_add_tail(&in->group_list, &group->ports); |
| |
| tb_port_dbg(in, "attached to bandwidth group %d\n", group->index); |
| } |
| |
| static struct tb_bandwidth_group *tb_find_free_bandwidth_group(struct tb_cm *tcm) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { |
| struct tb_bandwidth_group *group = &tcm->groups[i]; |
| |
| if (list_empty(&group->ports)) |
| return group; |
| } |
| |
| return NULL; |
| } |
| |
| static struct tb_bandwidth_group * |
| tb_attach_bandwidth_group(struct tb_cm *tcm, struct tb_port *in, |
| struct tb_port *out) |
| { |
| struct tb_bandwidth_group *group; |
| struct tb_tunnel *tunnel; |
| |
| /* |
| * Find all DP tunnels that go through all the same USB4 links |
| * as this one. Because we always setup tunnels the same way we |
| * can just check for the routers at both ends of the tunnels |
| * and if they are the same we have a match. |
| */ |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (!tb_tunnel_is_dp(tunnel)) |
| continue; |
| |
| if (tunnel->src_port->sw == in->sw && |
| tunnel->dst_port->sw == out->sw) { |
| group = tunnel->src_port->group; |
| if (group) { |
| tb_bandwidth_group_attach_port(group, in); |
| return group; |
| } |
| } |
| } |
| |
| /* Pick up next available group then */ |
| group = tb_find_free_bandwidth_group(tcm); |
| if (group) |
| tb_bandwidth_group_attach_port(group, in); |
| else |
| tb_port_warn(in, "no available bandwidth groups\n"); |
| |
| return group; |
| } |
| |
| static void tb_discover_bandwidth_group(struct tb_cm *tcm, struct tb_port *in, |
| struct tb_port *out) |
| { |
| if (usb4_dp_port_bandwidth_mode_enabled(in)) { |
| int index, i; |
| |
| index = usb4_dp_port_group_id(in); |
| for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) { |
| if (tcm->groups[i].index == index) { |
| tb_bandwidth_group_attach_port(&tcm->groups[i], in); |
| return; |
| } |
| } |
| } |
| |
| tb_attach_bandwidth_group(tcm, in, out); |
| } |
| |
| static void tb_detach_bandwidth_group(struct tb_port *in) |
| { |
| struct tb_bandwidth_group *group = in->group; |
| |
| if (group) { |
| in->group = NULL; |
| list_del_init(&in->group_list); |
| |
| tb_port_dbg(in, "detached from bandwidth group %d\n", group->index); |
| |
| /* No more tunnels so release the reserved bandwidth if any */ |
| if (list_empty(&group->ports)) { |
| cancel_delayed_work(&group->release_work); |
| __release_group_bandwidth(group); |
| } |
| } |
| } |
| |
| static void tb_discover_tunnels(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| |
| tb_switch_discover_tunnels(tb->root_switch, &tcm->tunnel_list, true); |
| |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_pci(tunnel)) { |
| struct tb_switch *parent = tunnel->dst_port->sw; |
| |
| while (parent != tunnel->src_port->sw) { |
| parent->boot = true; |
| parent = tb_switch_parent(parent); |
| } |
| } else if (tb_tunnel_is_dp(tunnel)) { |
| struct tb_port *in = tunnel->src_port; |
| struct tb_port *out = tunnel->dst_port; |
| |
| /* Keep the domain from powering down */ |
| pm_runtime_get_sync(&in->sw->dev); |
| pm_runtime_get_sync(&out->sw->dev); |
| |
| tb_discover_bandwidth_group(tcm, in, out); |
| } |
| } |
| } |
| |
| static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) |
| { |
| struct tb_port *src_port, *dst_port; |
| struct tb *tb; |
| |
| if (!tunnel) |
| return; |
| |
| tb_tunnel_deactivate(tunnel); |
| list_del(&tunnel->list); |
| |
| tb = tunnel->tb; |
| src_port = tunnel->src_port; |
| dst_port = tunnel->dst_port; |
| |
| switch (tunnel->type) { |
| case TB_TUNNEL_DP: |
| tb_detach_bandwidth_group(src_port); |
| /* |
| * In case of DP tunnel make sure the DP IN resource is |
| * deallocated properly. |
| */ |
| tb_switch_dealloc_dp_resource(src_port->sw, src_port); |
| /* |
| * If bandwidth on a link is < asym_threshold |
| * transition the link to symmetric. |
| */ |
| tb_configure_sym(tb, src_port, dst_port, true); |
| /* Now we can allow the domain to runtime suspend again */ |
| pm_runtime_mark_last_busy(&dst_port->sw->dev); |
| pm_runtime_put_autosuspend(&dst_port->sw->dev); |
| pm_runtime_mark_last_busy(&src_port->sw->dev); |
| pm_runtime_put_autosuspend(&src_port->sw->dev); |
| fallthrough; |
| |
| case TB_TUNNEL_USB3: |
| tb_reclaim_usb3_bandwidth(tb, src_port, dst_port); |
| break; |
| |
| default: |
| /* |
| * PCIe and DMA tunnels do not consume guaranteed |
| * bandwidth. |
| */ |
| break; |
| } |
| |
| tb_tunnel_free(tunnel); |
| } |
| |
| /* |
| * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away |
| */ |
| static void tb_free_invalid_tunnels(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| struct tb_tunnel *n; |
| |
| list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_invalid(tunnel)) |
| tb_deactivate_and_free_tunnel(tunnel); |
| } |
| } |
| |
| /* |
| * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches |
| */ |
| static void tb_free_unplugged_children(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| |
| tb_switch_for_each_port(sw, port) { |
| if (!tb_port_has_remote(port)) |
| continue; |
| |
| if (port->remote->sw->is_unplugged) { |
| tb_retimer_remove_all(port); |
| tb_remove_dp_resources(port->remote->sw); |
| tb_switch_unconfigure_link(port->remote->sw); |
| tb_switch_set_link_width(port->remote->sw, |
| TB_LINK_WIDTH_SINGLE); |
| tb_switch_remove(port->remote->sw); |
| port->remote = NULL; |
| if (port->dual_link_port) |
| port->dual_link_port->remote = NULL; |
| } else { |
| tb_free_unplugged_children(port->remote->sw); |
| } |
| } |
| } |
| |
| static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, |
| const struct tb_port *port) |
| { |
| struct tb_port *down = NULL; |
| |
| /* |
| * To keep plugging devices consistently in the same PCIe |
| * hierarchy, do mapping here for switch downstream PCIe ports. |
| */ |
| if (tb_switch_is_usb4(sw)) { |
| down = usb4_switch_map_pcie_down(sw, port); |
| } else if (!tb_route(sw)) { |
| int phy_port = tb_phy_port_from_link(port->port); |
| int index; |
| |
| /* |
| * Hard-coded Thunderbolt port to PCIe down port mapping |
| * per controller. |
| */ |
| if (tb_switch_is_cactus_ridge(sw) || |
| tb_switch_is_alpine_ridge(sw)) |
| index = !phy_port ? 6 : 7; |
| else if (tb_switch_is_falcon_ridge(sw)) |
| index = !phy_port ? 6 : 8; |
| else if (tb_switch_is_titan_ridge(sw)) |
| index = !phy_port ? 8 : 9; |
| else |
| goto out; |
| |
| /* Validate the hard-coding */ |
| if (WARN_ON(index > sw->config.max_port_number)) |
| goto out; |
| |
| down = &sw->ports[index]; |
| } |
| |
| if (down) { |
| if (WARN_ON(!tb_port_is_pcie_down(down))) |
| goto out; |
| if (tb_pci_port_is_enabled(down)) |
| goto out; |
| |
| return down; |
| } |
| |
| out: |
| return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); |
| } |
| |
| static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) |
| { |
| struct tb_port *host_port, *port; |
| struct tb_cm *tcm = tb_priv(tb); |
| |
| host_port = tb_route(in->sw) ? |
| tb_port_at(tb_route(in->sw), tb->root_switch) : NULL; |
| |
| list_for_each_entry(port, &tcm->dp_resources, list) { |
| if (!tb_port_is_dpout(port)) |
| continue; |
| |
| if (tb_port_is_enabled(port)) { |
| tb_port_dbg(port, "DP OUT in use\n"); |
| continue; |
| } |
| |
| /* Needs to be on different routers */ |
| if (in->sw == port->sw) { |
| tb_port_dbg(port, "skipping DP OUT on same router\n"); |
| continue; |
| } |
| |
| tb_port_dbg(port, "DP OUT available\n"); |
| |
| /* |
| * Keep the DP tunnel under the topology starting from |
| * the same host router downstream port. |
| */ |
| if (host_port && tb_route(port->sw)) { |
| struct tb_port *p; |
| |
| p = tb_port_at(tb_route(port->sw), tb->root_switch); |
| if (p != host_port) |
| continue; |
| } |
| |
| return port; |
| } |
| |
| return NULL; |
| } |
| |
| static bool tb_tunnel_one_dp(struct tb *tb, struct tb_port *in, |
| struct tb_port *out) |
| { |
| int available_up, available_down, ret, link_nr; |
| struct tb_cm *tcm = tb_priv(tb); |
| int consumed_up, consumed_down; |
| struct tb_tunnel *tunnel; |
| |
| /* |
| * This is only applicable to links that are not bonded (so |
| * when Thunderbolt 1 hardware is involved somewhere in the |
| * topology). For these try to share the DP bandwidth between |
| * the two lanes. |
| */ |
| link_nr = 1; |
| list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_dp(tunnel)) { |
| link_nr = 0; |
| break; |
| } |
| } |
| |
| /* |
| * DP stream needs the domain to be active so runtime resume |
| * both ends of the tunnel. |
| * |
| * This should bring the routers in the middle active as well |
| * and keeps the domain from runtime suspending while the DP |
| * tunnel is active. |
| */ |
| pm_runtime_get_sync(&in->sw->dev); |
| pm_runtime_get_sync(&out->sw->dev); |
| |
| if (tb_switch_alloc_dp_resource(in->sw, in)) { |
| tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); |
| goto err_rpm_put; |
| } |
| |
| if (!tb_attach_bandwidth_group(tcm, in, out)) |
| goto err_dealloc_dp; |
| |
| /* Make all unused USB3 bandwidth available for the new DP tunnel */ |
| ret = tb_release_unused_usb3_bandwidth(tb, in, out); |
| if (ret) { |
| tb_warn(tb, "failed to release unused bandwidth\n"); |
| goto err_detach_group; |
| } |
| |
| ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down, |
| true); |
| if (ret) |
| goto err_reclaim_usb; |
| |
| tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n", |
| available_up, available_down); |
| |
| tunnel = tb_tunnel_alloc_dp(tb, in, out, link_nr, available_up, |
| available_down); |
| if (!tunnel) { |
| tb_port_dbg(out, "could not allocate DP tunnel\n"); |
| goto err_reclaim_usb; |
| } |
| |
| if (tb_tunnel_activate(tunnel)) { |
| tb_port_info(out, "DP tunnel activation failed, aborting\n"); |
| goto err_free; |
| } |
| |
| /* If fail reading tunnel's consumed bandwidth, tear it down */ |
| ret = tb_tunnel_consumed_bandwidth(tunnel, &consumed_up, &consumed_down); |
| if (ret) |
| goto err_deactivate; |
| |
| list_add_tail(&tunnel->list, &tcm->tunnel_list); |
| |
| tb_reclaim_usb3_bandwidth(tb, in, out); |
| /* |
| * Transition the links to asymmetric if the consumption exceeds |
| * the threshold. |
| */ |
| tb_configure_asym(tb, in, out, consumed_up, consumed_down); |
| |
| /* Update the domain with the new bandwidth estimation */ |
| tb_recalc_estimated_bandwidth(tb); |
| |
| /* |
| * In case of DP tunnel exists, change host router's 1st children |
| * TMU mode to HiFi for CL0s to work. |
| */ |
| tb_increase_tmu_accuracy(tunnel); |
| return true; |
| |
| err_deactivate: |
| tb_tunnel_deactivate(tunnel); |
| err_free: |
| tb_tunnel_free(tunnel); |
| err_reclaim_usb: |
| tb_reclaim_usb3_bandwidth(tb, in, out); |
| err_detach_group: |
| tb_detach_bandwidth_group(in); |
| err_dealloc_dp: |
| tb_switch_dealloc_dp_resource(in->sw, in); |
| err_rpm_put: |
| pm_runtime_mark_last_busy(&out->sw->dev); |
| pm_runtime_put_autosuspend(&out->sw->dev); |
| pm_runtime_mark_last_busy(&in->sw->dev); |
| pm_runtime_put_autosuspend(&in->sw->dev); |
| |
| return false; |
| } |
| |
| static void tb_tunnel_dp(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_port *port, *in, *out; |
| |
| if (!tb_acpi_may_tunnel_dp()) { |
| tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n"); |
| return; |
| } |
| |
| /* |
| * Find pair of inactive DP IN and DP OUT adapters and then |
| * establish a DP tunnel between them. |
| */ |
| tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); |
| |
| in = NULL; |
| out = NULL; |
| list_for_each_entry(port, &tcm->dp_resources, list) { |
| if (!tb_port_is_dpin(port)) |
| continue; |
| |
| if (tb_port_is_enabled(port)) { |
| tb_port_dbg(port, "DP IN in use\n"); |
| continue; |
| } |
| |
| in = port; |
| tb_port_dbg(in, "DP IN available\n"); |
| |
| out = tb_find_dp_out(tb, port); |
| if (out) |
| tb_tunnel_one_dp(tb, in, out); |
| else |
| tb_port_dbg(in, "no suitable DP OUT adapter available, not tunneling\n"); |
| } |
| |
| if (!in) |
| tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); |
| } |
| |
| static void tb_enter_redrive(struct tb_port *port) |
| { |
| struct tb_switch *sw = port->sw; |
| |
| if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE)) |
| return; |
| |
| /* |
| * If we get hot-unplug for the DP IN port of the host router |
| * and the DP resource is not available anymore it means there |
| * is a monitor connected directly to the Type-C port and we are |
| * in "redrive" mode. For this to work we cannot enter RTD3 so |
| * we bump up the runtime PM reference count here. |
| */ |
| if (!tb_port_is_dpin(port)) |
| return; |
| if (tb_route(sw)) |
| return; |
| if (!tb_switch_query_dp_resource(sw, port)) { |
| port->redrive = true; |
| pm_runtime_get(&sw->dev); |
| tb_port_dbg(port, "enter redrive mode, keeping powered\n"); |
| } |
| } |
| |
| static void tb_exit_redrive(struct tb_port *port) |
| { |
| struct tb_switch *sw = port->sw; |
| |
| if (!(sw->quirks & QUIRK_KEEP_POWER_IN_DP_REDRIVE)) |
| return; |
| |
| if (!tb_port_is_dpin(port)) |
| return; |
| if (tb_route(sw)) |
| return; |
| if (port->redrive && tb_switch_query_dp_resource(sw, port)) { |
| port->redrive = false; |
| pm_runtime_put(&sw->dev); |
| tb_port_dbg(port, "exit redrive mode\n"); |
| } |
| } |
| |
| static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) |
| { |
| struct tb_port *in, *out; |
| struct tb_tunnel *tunnel; |
| |
| if (tb_port_is_dpin(port)) { |
| tb_port_dbg(port, "DP IN resource unavailable\n"); |
| in = port; |
| out = NULL; |
| } else { |
| tb_port_dbg(port, "DP OUT resource unavailable\n"); |
| in = NULL; |
| out = port; |
| } |
| |
| tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); |
| if (tunnel) |
| tb_deactivate_and_free_tunnel(tunnel); |
| else |
| tb_enter_redrive(port); |
| list_del_init(&port->list); |
| |
| /* |
| * See if there is another DP OUT port that can be used for |
| * to create another tunnel. |
| */ |
| tb_recalc_estimated_bandwidth(tb); |
| tb_tunnel_dp(tb); |
| } |
| |
| static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_port *p; |
| |
| if (tb_port_is_enabled(port)) |
| return; |
| |
| list_for_each_entry(p, &tcm->dp_resources, list) { |
| if (p == port) |
| return; |
| } |
| |
| tb_port_dbg(port, "DP %s resource available after hotplug\n", |
| tb_port_is_dpin(port) ? "IN" : "OUT"); |
| list_add_tail(&port->list, &tcm->dp_resources); |
| tb_exit_redrive(port); |
| |
| /* Look for suitable DP IN <-> DP OUT pairs now */ |
| tb_tunnel_dp(tb); |
| } |
| |
| static void tb_disconnect_and_release_dp(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel, *n; |
| |
| /* |
| * Tear down all DP tunnels and release their resources. They |
| * will be re-established after resume based on plug events. |
| */ |
| list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) { |
| if (tb_tunnel_is_dp(tunnel)) |
| tb_deactivate_and_free_tunnel(tunnel); |
| } |
| |
| while (!list_empty(&tcm->dp_resources)) { |
| struct tb_port *port; |
| |
| port = list_first_entry(&tcm->dp_resources, |
| struct tb_port, list); |
| list_del_init(&port->list); |
| } |
| } |
| |
| static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw) |
| { |
| struct tb_tunnel *tunnel; |
| struct tb_port *up; |
| |
| up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); |
| if (WARN_ON(!up)) |
| return -ENODEV; |
| |
| tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up); |
| if (WARN_ON(!tunnel)) |
| return -ENODEV; |
| |
| tb_switch_xhci_disconnect(sw); |
| |
| tb_tunnel_deactivate(tunnel); |
| list_del(&tunnel->list); |
| tb_tunnel_free(tunnel); |
| return 0; |
| } |
| |
| static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) |
| { |
| struct tb_port *up, *down, *port; |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| |
| up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); |
| if (!up) |
| return 0; |
| |
| /* |
| * Look up available down port. Since we are chaining it should |
| * be found right above this switch. |
| */ |
| port = tb_switch_downstream_port(sw); |
| down = tb_find_pcie_down(tb_switch_parent(sw), port); |
| if (!down) |
| return 0; |
| |
| tunnel = tb_tunnel_alloc_pci(tb, up, down); |
| if (!tunnel) |
| return -ENOMEM; |
| |
| if (tb_tunnel_activate(tunnel)) { |
| tb_port_info(up, |
| "PCIe tunnel activation failed, aborting\n"); |
| tb_tunnel_free(tunnel); |
| return -EIO; |
| } |
| |
| /* |
| * PCIe L1 is needed to enable CL0s for Titan Ridge so enable it |
| * here. |
| */ |
| if (tb_switch_pcie_l1_enable(sw)) |
| tb_sw_warn(sw, "failed to enable PCIe L1 for Titan Ridge\n"); |
| |
| if (tb_switch_xhci_connect(sw)) |
| tb_sw_warn(sw, "failed to connect xHCI\n"); |
| |
| list_add_tail(&tunnel->list, &tcm->tunnel_list); |
| return 0; |
| } |
| |
| static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
| int transmit_path, int transmit_ring, |
| int receive_path, int receive_ring) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_port *nhi_port, *dst_port; |
| struct tb_tunnel *tunnel; |
| struct tb_switch *sw; |
| int ret; |
| |
| sw = tb_to_switch(xd->dev.parent); |
| dst_port = tb_port_at(xd->route, sw); |
| nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); |
| |
| mutex_lock(&tb->lock); |
| |
| /* |
| * When tunneling DMA paths the link should not enter CL states |
| * so disable them now. |
| */ |
| tb_disable_clx(sw); |
| |
| tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path, |
| transmit_ring, receive_path, receive_ring); |
| if (!tunnel) { |
| ret = -ENOMEM; |
| goto err_clx; |
| } |
| |
| if (tb_tunnel_activate(tunnel)) { |
| tb_port_info(nhi_port, |
| "DMA tunnel activation failed, aborting\n"); |
| ret = -EIO; |
| goto err_free; |
| } |
| |
| list_add_tail(&tunnel->list, &tcm->tunnel_list); |
| mutex_unlock(&tb->lock); |
| return 0; |
| |
| err_free: |
| tb_tunnel_free(tunnel); |
| err_clx: |
| tb_enable_clx(sw); |
| mutex_unlock(&tb->lock); |
| |
| return ret; |
| } |
| |
| static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
| int transmit_path, int transmit_ring, |
| int receive_path, int receive_ring) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_port *nhi_port, *dst_port; |
| struct tb_tunnel *tunnel, *n; |
| struct tb_switch *sw; |
| |
| sw = tb_to_switch(xd->dev.parent); |
| dst_port = tb_port_at(xd->route, sw); |
| nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); |
| |
| list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
| if (!tb_tunnel_is_dma(tunnel)) |
| continue; |
| if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port) |
| continue; |
| |
| if (tb_tunnel_match_dma(tunnel, transmit_path, transmit_ring, |
| receive_path, receive_ring)) |
| tb_deactivate_and_free_tunnel(tunnel); |
| } |
| |
| /* |
| * Try to re-enable CL states now, it is OK if this fails |
| * because we may still have another DMA tunnel active through |
| * the same host router USB4 downstream port. |
| */ |
| tb_enable_clx(sw); |
| } |
| |
| static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
| int transmit_path, int transmit_ring, |
| int receive_path, int receive_ring) |
| { |
| if (!xd->is_unplugged) { |
| mutex_lock(&tb->lock); |
| __tb_disconnect_xdomain_paths(tb, xd, transmit_path, |
| transmit_ring, receive_path, |
| receive_ring); |
| mutex_unlock(&tb->lock); |
| } |
| return 0; |
| } |
| |
| /* hotplug handling */ |
| |
| /* |
| * tb_handle_hotplug() - handle hotplug event |
| * |
| * Executes on tb->wq. |
| */ |
| static void tb_handle_hotplug(struct work_struct *work) |
| { |
| struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); |
| struct tb *tb = ev->tb; |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_switch *sw; |
| struct tb_port *port; |
| |
| /* Bring the domain back from sleep if it was suspended */ |
| pm_runtime_get_sync(&tb->dev); |
| |
| mutex_lock(&tb->lock); |
| if (!tcm->hotplug_active) |
| goto out; /* during init, suspend or shutdown */ |
| |
| sw = tb_switch_find_by_route(tb, ev->route); |
| if (!sw) { |
| tb_warn(tb, |
| "hotplug event from non existent switch %llx:%x (unplug: %d)\n", |
| ev->route, ev->port, ev->unplug); |
| goto out; |
| } |
| if (ev->port > sw->config.max_port_number) { |
| tb_warn(tb, |
| "hotplug event from non existent port %llx:%x (unplug: %d)\n", |
| ev->route, ev->port, ev->unplug); |
| goto put_sw; |
| } |
| port = &sw->ports[ev->port]; |
| if (tb_is_upstream_port(port)) { |
| tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", |
| ev->route, ev->port, ev->unplug); |
| goto put_sw; |
| } |
| |
| pm_runtime_get_sync(&sw->dev); |
| |
| if (ev->unplug) { |
| tb_retimer_remove_all(port); |
| |
| if (tb_port_has_remote(port)) { |
| tb_port_dbg(port, "switch unplugged\n"); |
| tb_sw_set_unplugged(port->remote->sw); |
| tb_free_invalid_tunnels(tb); |
| tb_remove_dp_resources(port->remote->sw); |
| tb_switch_tmu_disable(port->remote->sw); |
| tb_switch_unconfigure_link(port->remote->sw); |
| tb_switch_set_link_width(port->remote->sw, |
| TB_LINK_WIDTH_SINGLE); |
| tb_switch_remove(port->remote->sw); |
| port->remote = NULL; |
| if (port->dual_link_port) |
| port->dual_link_port->remote = NULL; |
| /* Maybe we can create another DP tunnel */ |
| tb_recalc_estimated_bandwidth(tb); |
| tb_tunnel_dp(tb); |
| } else if (port->xdomain) { |
| struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); |
| |
| tb_port_dbg(port, "xdomain unplugged\n"); |
| /* |
| * Service drivers are unbound during |
| * tb_xdomain_remove() so setting XDomain as |
| * unplugged here prevents deadlock if they call |
| * tb_xdomain_disable_paths(). We will tear down |
| * all the tunnels below. |
| */ |
| xd->is_unplugged = true; |
| tb_xdomain_remove(xd); |
| port->xdomain = NULL; |
| __tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1); |
| tb_xdomain_put(xd); |
| tb_port_unconfigure_xdomain(port); |
| } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { |
| tb_dp_resource_unavailable(tb, port); |
| } else if (!port->port) { |
| tb_sw_dbg(sw, "xHCI disconnect request\n"); |
| tb_switch_xhci_disconnect(sw); |
| } else { |
| tb_port_dbg(port, |
| "got unplug event for disconnected port, ignoring\n"); |
| } |
| } else if (port->remote) { |
| tb_port_dbg(port, "got plug event for connected port, ignoring\n"); |
| } else if (!port->port && sw->authorized) { |
| tb_sw_dbg(sw, "xHCI connect request\n"); |
| tb_switch_xhci_connect(sw); |
| } else { |
| if (tb_port_is_null(port)) { |
| tb_port_dbg(port, "hotplug: scanning\n"); |
| tb_scan_port(port); |
| if (!port->remote) |
| tb_port_dbg(port, "hotplug: no switch found\n"); |
| } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { |
| tb_dp_resource_available(tb, port); |
| } |
| } |
| |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| |
| put_sw: |
| tb_switch_put(sw); |
| out: |
| mutex_unlock(&tb->lock); |
| |
| pm_runtime_mark_last_busy(&tb->dev); |
| pm_runtime_put_autosuspend(&tb->dev); |
| |
| kfree(ev); |
| } |
| |
| static int tb_alloc_dp_bandwidth(struct tb_tunnel *tunnel, int *requested_up, |
| int *requested_down) |
| { |
| int allocated_up, allocated_down, available_up, available_down, ret; |
| int requested_up_corrected, requested_down_corrected, granularity; |
| int max_up, max_down, max_up_rounded, max_down_rounded; |
| struct tb_bandwidth_group *group; |
| struct tb *tb = tunnel->tb; |
| struct tb_port *in, *out; |
| bool downstream; |
| |
| ret = tb_tunnel_allocated_bandwidth(tunnel, &allocated_up, &allocated_down); |
| if (ret) |
| return ret; |
| |
| in = tunnel->src_port; |
| out = tunnel->dst_port; |
| |
| tb_tunnel_dbg(tunnel, "bandwidth allocated currently %d/%d Mb/s\n", |
| allocated_up, allocated_down); |
| |
| /* |
| * If we get rounded up request from graphics side, say HBR2 x 4 |
| * that is 17500 instead of 17280 (this is because of the |
| * granularity), we allow it too. Here the graphics has already |
| * negotiated with the DPRX the maximum possible rates (which is |
| * 17280 in this case). |
| * |
| * Since the link cannot go higher than 17280 we use that in our |
| * calculations but the DP IN adapter Allocated BW write must be |
| * the same value (17500) otherwise the adapter will mark it as |
| * failed for graphics. |
| */ |
| ret = tb_tunnel_maximum_bandwidth(tunnel, &max_up, &max_down); |
| if (ret) |
| goto fail; |
| |
| ret = usb4_dp_port_granularity(in); |
| if (ret < 0) |
| goto fail; |
| granularity = ret; |
| |
| max_up_rounded = roundup(max_up, granularity); |
| max_down_rounded = roundup(max_down, granularity); |
| |
| /* |
| * This will "fix" the request down to the maximum supported |
| * rate * lanes if it is at the maximum rounded up level. |
| */ |
| requested_up_corrected = *requested_up; |
| if (requested_up_corrected == max_up_rounded) |
| requested_up_corrected = max_up; |
| else if (requested_up_corrected < 0) |
| requested_up_corrected = 0; |
| requested_down_corrected = *requested_down; |
| if (requested_down_corrected == max_down_rounded) |
| requested_down_corrected = max_down; |
| else if (requested_down_corrected < 0) |
| requested_down_corrected = 0; |
| |
| tb_tunnel_dbg(tunnel, "corrected bandwidth request %d/%d Mb/s\n", |
| requested_up_corrected, requested_down_corrected); |
| |
| if ((*requested_up >= 0 && requested_up_corrected > max_up_rounded) || |
| (*requested_down >= 0 && requested_down_corrected > max_down_rounded)) { |
| tb_tunnel_dbg(tunnel, |
| "bandwidth request too high (%d/%d Mb/s > %d/%d Mb/s)\n", |
| requested_up_corrected, requested_down_corrected, |
| max_up_rounded, max_down_rounded); |
| ret = -ENOBUFS; |
| goto fail; |
| } |
| |
| downstream = tb_tunnel_direction_downstream(tunnel); |
| group = in->group; |
| |
| if ((*requested_up >= 0 && requested_up_corrected <= allocated_up) || |
| (*requested_down >= 0 && requested_down_corrected <= allocated_down)) { |
| if (tunnel->bw_mode) { |
| int reserved; |
| /* |
| * If requested bandwidth is less or equal than |
| * what is currently allocated to that tunnel we |
| * simply change the reservation of the tunnel |
| * and add the released bandwidth for the group |
| * for the next 10s. Then we release it for |
| * others to use. |
| */ |
| if (downstream) |
| reserved = allocated_down - *requested_down; |
| else |
| reserved = allocated_up - *requested_up; |
| |
| if (reserved > 0) { |
| group->reserved += reserved; |
| tb_dbg(tb, "group %d reserved %d total %d Mb/s\n", |
| group->index, reserved, group->reserved); |
| |
| /* |
| * If it was not already pending, |
| * schedule release now. If it is then |
| * postpone it for the next 10s (unless |
| * it is already running in which case |
| * the 10s already expired and we should |
| * give the reserved back to others). |
| */ |
| mod_delayed_work(system_wq, &group->release_work, |
| msecs_to_jiffies(TB_RELEASE_BW_TIMEOUT)); |
| } |
| } |
| |
| return tb_tunnel_alloc_bandwidth(tunnel, requested_up, |
| requested_down); |
| } |
| |
| /* |
| * More bandwidth is requested. Release all the potential |
| * bandwidth from USB3 first. |
| */ |
| ret = tb_release_unused_usb3_bandwidth(tb, in, out); |
| if (ret) |
| goto fail; |
| |
| /* |
| * Then go over all tunnels that cross the same USB4 ports (they |
| * are also in the same group but we use the same function here |
| * that we use with the normal bandwidth allocation). |
| */ |
| ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down, |
| true); |
| if (ret) |
| goto reclaim; |
| |
| tb_tunnel_dbg(tunnel, "bandwidth available for allocation %d/%d (+ %u reserved) Mb/s\n", |
| available_up, available_down, group->reserved); |
| |
| if ((*requested_up >= 0 && |
| available_up + group->reserved >= requested_up_corrected) || |
| (*requested_down >= 0 && |
| available_down + group->reserved >= requested_down_corrected)) { |
| int released = 0; |
| |
| /* |
| * If bandwidth on a link is >= asym_threshold |
| * transition the link to asymmetric. |
| */ |
| ret = tb_configure_asym(tb, in, out, *requested_up, |
| *requested_down); |
| if (ret) { |
| tb_configure_sym(tb, in, out, true); |
| goto fail; |
| } |
| |
| ret = tb_tunnel_alloc_bandwidth(tunnel, requested_up, |
| requested_down); |
| if (ret) { |
| tb_tunnel_warn(tunnel, "failed to allocate bandwidth\n"); |
| tb_configure_sym(tb, in, out, true); |
| } |
| |
| if (downstream) { |
| if (*requested_down > available_down) |
| released = *requested_down - available_down; |
| } else { |
| if (*requested_up > available_up) |
| released = *requested_up - available_up; |
| } |
| if (released) { |
| group->reserved -= released; |
| tb_dbg(tb, "group %d released %d total %d Mb/s\n", |
| group->index, released, group->reserved); |
| } |
| } else { |
| ret = -ENOBUFS; |
| } |
| |
| reclaim: |
| tb_reclaim_usb3_bandwidth(tb, in, out); |
| fail: |
| if (ret && ret != -ENODEV) { |
| /* |
| * Write back the same allocated (so no change), this |
| * makes the DPTX request fail on graphics side. |
| */ |
| tb_tunnel_dbg(tunnel, |
| "failing the request by rewriting allocated %d/%d Mb/s\n", |
| allocated_up, allocated_down); |
| tb_tunnel_alloc_bandwidth(tunnel, &allocated_up, &allocated_down); |
| } |
| |
| return ret; |
| } |
| |
| static void tb_handle_dp_bandwidth_request(struct work_struct *work) |
| { |
| struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); |
| int requested_bw, requested_up, requested_down, ret; |
| struct tb_tunnel *tunnel; |
| struct tb *tb = ev->tb; |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_switch *sw; |
| struct tb_port *in; |
| |
| pm_runtime_get_sync(&tb->dev); |
| |
| mutex_lock(&tb->lock); |
| if (!tcm->hotplug_active) |
| goto unlock; |
| |
| sw = tb_switch_find_by_route(tb, ev->route); |
| if (!sw) { |
| tb_warn(tb, "bandwidth request from non-existent router %llx\n", |
| ev->route); |
| goto unlock; |
| } |
| |
| in = &sw->ports[ev->port]; |
| if (!tb_port_is_dpin(in)) { |
| tb_port_warn(in, "bandwidth request to non-DP IN adapter\n"); |
| goto put_sw; |
| } |
| |
| tb_port_dbg(in, "handling bandwidth allocation request\n"); |
| |
| tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, NULL); |
| if (!tunnel) { |
| tb_port_warn(in, "failed to find tunnel\n"); |
| goto put_sw; |
| } |
| |
| if (!usb4_dp_port_bandwidth_mode_enabled(in)) { |
| if (tunnel->bw_mode) { |
| /* |
| * Reset the tunnel back to use the legacy |
| * allocation. |
| */ |
| tunnel->bw_mode = false; |
| tb_port_dbg(in, "DPTX disabled bandwidth allocation mode\n"); |
| } else { |
| tb_port_warn(in, "bandwidth allocation mode not enabled\n"); |
| } |
| goto put_sw; |
| } |
| |
| ret = usb4_dp_port_requested_bandwidth(in); |
| if (ret < 0) { |
| if (ret == -ENODATA) { |
| /* |
| * There is no request active so this means the |
| * BW allocation mode was enabled from graphics |
| * side. At this point we know that the graphics |
| * driver has read the DRPX capabilities so we |
| * can offer an better bandwidth estimatation. |
| */ |
| tb_port_dbg(in, "DPTX enabled bandwidth allocation mode, updating estimated bandwidth\n"); |
| tb_recalc_estimated_bandwidth(tb); |
| } else { |
| tb_port_warn(in, "failed to read requested bandwidth\n"); |
| } |
| goto put_sw; |
| } |
| requested_bw = ret; |
| |
| tb_port_dbg(in, "requested bandwidth %d Mb/s\n", requested_bw); |
| |
| if (tb_tunnel_direction_downstream(tunnel)) { |
| requested_up = -1; |
| requested_down = requested_bw; |
| } else { |
| requested_up = requested_bw; |
| requested_down = -1; |
| } |
| |
| ret = tb_alloc_dp_bandwidth(tunnel, &requested_up, &requested_down); |
| if (ret) { |
| if (ret == -ENOBUFS) |
| tb_tunnel_warn(tunnel, |
| "not enough bandwidth available\n"); |
| else |
| tb_tunnel_warn(tunnel, |
| "failed to change bandwidth allocation\n"); |
| } else { |
| tb_tunnel_dbg(tunnel, |
| "bandwidth allocation changed to %d/%d Mb/s\n", |
| requested_up, requested_down); |
| |
| /* Update other clients about the allocation change */ |
| tb_recalc_estimated_bandwidth(tb); |
| } |
| |
| put_sw: |
| tb_switch_put(sw); |
| unlock: |
| mutex_unlock(&tb->lock); |
| |
| pm_runtime_mark_last_busy(&tb->dev); |
| pm_runtime_put_autosuspend(&tb->dev); |
| |
| kfree(ev); |
| } |
| |
| static void tb_queue_dp_bandwidth_request(struct tb *tb, u64 route, u8 port) |
| { |
| struct tb_hotplug_event *ev; |
| |
| ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
| if (!ev) |
| return; |
| |
| ev->tb = tb; |
| ev->route = route; |
| ev->port = port; |
| INIT_WORK(&ev->work, tb_handle_dp_bandwidth_request); |
| queue_work(tb->wq, &ev->work); |
| } |
| |
| static void tb_handle_notification(struct tb *tb, u64 route, |
| const struct cfg_error_pkg *error) |
| { |
| |
| switch (error->error) { |
| case TB_CFG_ERROR_PCIE_WAKE: |
| case TB_CFG_ERROR_DP_CON_CHANGE: |
| case TB_CFG_ERROR_DPTX_DISCOVERY: |
| if (tb_cfg_ack_notification(tb->ctl, route, error)) |
| tb_warn(tb, "could not ack notification on %llx\n", |
| route); |
| break; |
| |
| case TB_CFG_ERROR_DP_BW: |
| if (tb_cfg_ack_notification(tb->ctl, route, error)) |
| tb_warn(tb, "could not ack notification on %llx\n", |
| route); |
| tb_queue_dp_bandwidth_request(tb, route, error->port); |
| break; |
| |
| default: |
| /* Ignore for now */ |
| break; |
| } |
| } |
| |
| /* |
| * tb_schedule_hotplug_handler() - callback function for the control channel |
| * |
| * Delegates to tb_handle_hotplug. |
| */ |
| static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, |
| const void *buf, size_t size) |
| { |
| const struct cfg_event_pkg *pkg = buf; |
| u64 route = tb_cfg_get_route(&pkg->header); |
| |
| switch (type) { |
| case TB_CFG_PKG_ERROR: |
| tb_handle_notification(tb, route, (const struct cfg_error_pkg *)buf); |
| return; |
| case TB_CFG_PKG_EVENT: |
| break; |
| default: |
| tb_warn(tb, "unexpected event %#x, ignoring\n", type); |
| return; |
| } |
| |
| if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { |
| tb_warn(tb, "could not ack plug event on %llx:%x\n", route, |
| pkg->port); |
| } |
| |
| tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); |
| } |
| |
| static void tb_stop(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel; |
| struct tb_tunnel *n; |
| |
| cancel_delayed_work(&tcm->remove_work); |
| /* tunnels are only present after everything has been initialized */ |
| list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
| /* |
| * DMA tunnels require the driver to be functional so we |
| * tear them down. Other protocol tunnels can be left |
| * intact. |
| */ |
| if (tb_tunnel_is_dma(tunnel)) |
| tb_tunnel_deactivate(tunnel); |
| tb_tunnel_free(tunnel); |
| } |
| tb_switch_remove(tb->root_switch); |
| tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ |
| } |
| |
| static void tb_deinit(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| int i; |
| |
| /* Cancel all the release bandwidth workers */ |
| for (i = 0; i < ARRAY_SIZE(tcm->groups); i++) |
| cancel_delayed_work_sync(&tcm->groups[i].release_work); |
| } |
| |
| static int tb_scan_finalize_switch(struct device *dev, void *data) |
| { |
| if (tb_is_switch(dev)) { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| /* |
| * If we found that the switch was already setup by the |
| * boot firmware, mark it as authorized now before we |
| * send uevent to userspace. |
| */ |
| if (sw->boot) |
| sw->authorized = 1; |
| |
| dev_set_uevent_suppress(dev, false); |
| kobject_uevent(&dev->kobj, KOBJ_ADD); |
| device_for_each_child(dev, NULL, tb_scan_finalize_switch); |
| } |
| |
| return 0; |
| } |
| |
| static int tb_start(struct tb *tb, bool reset) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| bool discover = true; |
| int ret; |
| |
| tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); |
| if (IS_ERR(tb->root_switch)) |
| return PTR_ERR(tb->root_switch); |
| |
| /* |
| * ICM firmware upgrade needs running firmware and in native |
| * mode that is not available so disable firmware upgrade of the |
| * root switch. |
| * |
| * However, USB4 routers support NVM firmware upgrade if they |
| * implement the necessary router operations. |
| */ |
| tb->root_switch->no_nvm_upgrade = !tb_switch_is_usb4(tb->root_switch); |
| /* All USB4 routers support runtime PM */ |
| tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch); |
| |
| ret = tb_switch_configure(tb->root_switch); |
| if (ret) { |
| tb_switch_put(tb->root_switch); |
| return ret; |
| } |
| |
| /* Announce the switch to the world */ |
| ret = tb_switch_add(tb->root_switch); |
| if (ret) { |
| tb_switch_put(tb->root_switch); |
| return ret; |
| } |
| |
| /* |
| * To support highest CLx state, we set host router's TMU to |
| * Normal mode. |
| */ |
| tb_switch_tmu_configure(tb->root_switch, TB_SWITCH_TMU_MODE_LOWRES); |
| /* Enable TMU if it is off */ |
| tb_switch_tmu_enable(tb->root_switch); |
| |
| /* |
| * Boot firmware might have created tunnels of its own. Since we |
| * cannot be sure they are usable for us, tear them down and |
| * reset the ports to handle it as new hotplug for USB4 v1 |
| * routers (for USB4 v2 and beyond we already do host reset). |
| */ |
| if (reset && tb_switch_is_usb4(tb->root_switch)) { |
| discover = false; |
| if (usb4_switch_version(tb->root_switch) == 1) |
| tb_switch_reset(tb->root_switch); |
| } |
| |
| if (discover) { |
| /* Full scan to discover devices added before the driver was loaded. */ |
| tb_scan_switch(tb->root_switch); |
| /* Find out tunnels created by the boot firmware */ |
| tb_discover_tunnels(tb); |
| /* Add DP resources from the DP tunnels created by the boot firmware */ |
| tb_discover_dp_resources(tb); |
| } |
| |
| /* |
| * If the boot firmware did not create USB 3.x tunnels create them |
| * now for the whole topology. |
| */ |
| tb_create_usb3_tunnels(tb->root_switch); |
| /* Add DP IN resources for the root switch */ |
| tb_add_dp_resources(tb->root_switch); |
| /* Make the discovered switches available to the userspace */ |
| device_for_each_child(&tb->root_switch->dev, NULL, |
| tb_scan_finalize_switch); |
| |
| /* Allow tb_handle_hotplug to progress events */ |
| tcm->hotplug_active = true; |
| return 0; |
| } |
| |
| static int tb_suspend_noirq(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| |
| tb_dbg(tb, "suspending...\n"); |
| tb_disconnect_and_release_dp(tb); |
| tb_switch_suspend(tb->root_switch, false); |
| tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ |
| tb_dbg(tb, "suspend finished\n"); |
| |
| return 0; |
| } |
| |
| static void tb_restore_children(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| |
| /* No need to restore if the router is already unplugged */ |
| if (sw->is_unplugged) |
| return; |
| |
| if (tb_enable_clx(sw)) |
| tb_sw_warn(sw, "failed to re-enable CL states\n"); |
| |
| if (tb_enable_tmu(sw)) |
| tb_sw_warn(sw, "failed to restore TMU configuration\n"); |
| |
| tb_switch_configuration_valid(sw); |
| |
| tb_switch_for_each_port(sw, port) { |
| if (!tb_port_has_remote(port) && !port->xdomain) |
| continue; |
| |
| if (port->remote) { |
| tb_switch_set_link_width(port->remote->sw, |
| port->remote->sw->link_width); |
| tb_switch_configure_link(port->remote->sw); |
| |
| tb_restore_children(port->remote->sw); |
| } else if (port->xdomain) { |
| tb_port_configure_xdomain(port, port->xdomain); |
| } |
| } |
| } |
| |
| static int tb_resume_noirq(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel, *n; |
| unsigned int usb3_delay = 0; |
| LIST_HEAD(tunnels); |
| |
| tb_dbg(tb, "resuming...\n"); |
| |
| /* |
| * For non-USB4 hosts (Apple systems) remove any PCIe devices |
| * the firmware might have setup. |
| */ |
| if (!tb_switch_is_usb4(tb->root_switch)) |
| tb_switch_reset(tb->root_switch); |
| |
| tb_switch_resume(tb->root_switch, false); |
| tb_free_invalid_tunnels(tb); |
| tb_free_unplugged_children(tb->root_switch); |
| tb_restore_children(tb->root_switch); |
| |
| /* |
| * If we get here from suspend to disk the boot firmware or the |
| * restore kernel might have created tunnels of its own. Since |
| * we cannot be sure they are usable for us we find and tear |
| * them down. |
| */ |
| tb_switch_discover_tunnels(tb->root_switch, &tunnels, false); |
| list_for_each_entry_safe_reverse(tunnel, n, &tunnels, list) { |
| if (tb_tunnel_is_usb3(tunnel)) |
| usb3_delay = 500; |
| tb_tunnel_deactivate(tunnel); |
| tb_tunnel_free(tunnel); |
| } |
| |
| /* Re-create our tunnels now */ |
| list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
| /* USB3 requires delay before it can be re-activated */ |
| if (tb_tunnel_is_usb3(tunnel)) { |
| msleep(usb3_delay); |
| /* Only need to do it once */ |
| usb3_delay = 0; |
| } |
| tb_tunnel_restart(tunnel); |
| } |
| if (!list_empty(&tcm->tunnel_list)) { |
| /* |
| * the pcie links need some time to get going. |
| * 100ms works for me... |
| */ |
| tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); |
| msleep(100); |
| } |
| /* Allow tb_handle_hotplug to progress events */ |
| tcm->hotplug_active = true; |
| tb_dbg(tb, "resume finished\n"); |
| |
| return 0; |
| } |
| |
| static int tb_free_unplugged_xdomains(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| int ret = 0; |
| |
| tb_switch_for_each_port(sw, port) { |
| if (tb_is_upstream_port(port)) |
| continue; |
| if (port->xdomain && port->xdomain->is_unplugged) { |
| tb_retimer_remove_all(port); |
| tb_xdomain_remove(port->xdomain); |
| tb_port_unconfigure_xdomain(port); |
| port->xdomain = NULL; |
| ret++; |
| } else if (port->remote) { |
| ret += tb_free_unplugged_xdomains(port->remote->sw); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int tb_freeze_noirq(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| |
| tcm->hotplug_active = false; |
| return 0; |
| } |
| |
| static int tb_thaw_noirq(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| |
| tcm->hotplug_active = true; |
| return 0; |
| } |
| |
| static void tb_complete(struct tb *tb) |
| { |
| /* |
| * Release any unplugged XDomains and if there is a case where |
| * another domain is swapped in place of unplugged XDomain we |
| * need to run another rescan. |
| */ |
| mutex_lock(&tb->lock); |
| if (tb_free_unplugged_xdomains(tb->root_switch)) |
| tb_scan_switch(tb->root_switch); |
| mutex_unlock(&tb->lock); |
| } |
| |
| static int tb_runtime_suspend(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| |
| mutex_lock(&tb->lock); |
| tb_switch_suspend(tb->root_switch, true); |
| tcm->hotplug_active = false; |
| mutex_unlock(&tb->lock); |
| |
| return 0; |
| } |
| |
| static void tb_remove_work(struct work_struct *work) |
| { |
| struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work); |
| struct tb *tb = tcm_to_tb(tcm); |
| |
| mutex_lock(&tb->lock); |
| if (tb->root_switch) { |
| tb_free_unplugged_children(tb->root_switch); |
| tb_free_unplugged_xdomains(tb->root_switch); |
| } |
| mutex_unlock(&tb->lock); |
| } |
| |
| static int tb_runtime_resume(struct tb *tb) |
| { |
| struct tb_cm *tcm = tb_priv(tb); |
| struct tb_tunnel *tunnel, *n; |
| |
| mutex_lock(&tb->lock); |
| tb_switch_resume(tb->root_switch, true); |
| tb_free_invalid_tunnels(tb); |
| tb_restore_children(tb->root_switch); |
| list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) |
| tb_tunnel_restart(tunnel); |
| tcm->hotplug_active = true; |
| mutex_unlock(&tb->lock); |
| |
| /* |
| * Schedule cleanup of any unplugged devices. Run this in a |
| * separate thread to avoid possible deadlock if the device |
| * removal runtime resumes the unplugged device. |
| */ |
| queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50)); |
| return 0; |
| } |
| |
| static const struct tb_cm_ops tb_cm_ops = { |
| .start = tb_start, |
| .stop = tb_stop, |
| .deinit = tb_deinit, |
| .suspend_noirq = tb_suspend_noirq, |
| .resume_noirq = tb_resume_noirq, |
| .freeze_noirq = tb_freeze_noirq, |
| .thaw_noirq = tb_thaw_noirq, |
| .complete = tb_complete, |
| .runtime_suspend = tb_runtime_suspend, |
| .runtime_resume = tb_runtime_resume, |
| .handle_event = tb_handle_event, |
| .disapprove_switch = tb_disconnect_pci, |
| .approve_switch = tb_tunnel_pci, |
| .approve_xdomain_paths = tb_approve_xdomain_paths, |
| .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, |
| }; |
| |
| /* |
| * During suspend the Thunderbolt controller is reset and all PCIe |
| * tunnels are lost. The NHI driver will try to reestablish all tunnels |
| * during resume. This adds device links between the tunneled PCIe |
| * downstream ports and the NHI so that the device core will make sure |
| * NHI is resumed first before the rest. |
| */ |
| static bool tb_apple_add_links(struct tb_nhi *nhi) |
| { |
| struct pci_dev *upstream, *pdev; |
| bool ret; |
| |
| if (!x86_apple_machine) |
| return false; |
| |
| switch (nhi->pdev->device) { |
| case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: |
| case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: |
| case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: |
| case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: |
| break; |
| default: |
| return false; |
| } |
| |
| upstream = pci_upstream_bridge(nhi->pdev); |
| while (upstream) { |
| if (!pci_is_pcie(upstream)) |
| return false; |
| if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM) |
| break; |
| upstream = pci_upstream_bridge(upstream); |
| } |
| |
| if (!upstream) |
| return false; |
| |
| /* |
| * For each hotplug downstream port, create add device link |
| * back to NHI so that PCIe tunnels can be re-established after |
| * sleep. |
| */ |
| ret = false; |
| for_each_pci_bridge(pdev, upstream->subordinate) { |
| const struct device_link *link; |
| |
| if (!pci_is_pcie(pdev)) |
| continue; |
| if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM || |
| !pdev->is_hotplug_bridge) |
| continue; |
| |
| link = device_link_add(&pdev->dev, &nhi->pdev->dev, |
| DL_FLAG_AUTOREMOVE_SUPPLIER | |
| DL_FLAG_PM_RUNTIME); |
| if (link) { |
| dev_dbg(&nhi->pdev->dev, "created link from %s\n", |
| dev_name(&pdev->dev)); |
| ret = true; |
| } else { |
| dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", |
| dev_name(&pdev->dev)); |
| } |
| } |
| |
| return ret; |
| } |
| |
| struct tb *tb_probe(struct tb_nhi *nhi) |
| { |
| struct tb_cm *tcm; |
| struct tb *tb; |
| |
| tb = tb_domain_alloc(nhi, TB_TIMEOUT, sizeof(*tcm)); |
| if (!tb) |
| return NULL; |
| |
| if (tb_acpi_may_tunnel_pcie()) |
| tb->security_level = TB_SECURITY_USER; |
| else |
| tb->security_level = TB_SECURITY_NOPCIE; |
| |
| tb->cm_ops = &tb_cm_ops; |
| |
| tcm = tb_priv(tb); |
| INIT_LIST_HEAD(&tcm->tunnel_list); |
| INIT_LIST_HEAD(&tcm->dp_resources); |
| INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work); |
| tb_init_bandwidth_groups(tcm); |
| |
| tb_dbg(tb, "using software connection manager\n"); |
| |