diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-thunderbolt | 26 | ||||
| -rw-r--r-- | Documentation/admin-guide/thunderbolt.rst | 29 | ||||
| -rw-r--r-- | drivers/thunderbolt/retimer.c | 24 | ||||
| -rw-r--r-- | drivers/thunderbolt/switch.c | 48 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.c | 4 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.h | 5 | ||||
| -rw-r--r-- | drivers/thunderbolt/usb4_port.c | 169 |
7 files changed, 277 insertions, 28 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt index 3537ba1ba892..f6743dc33aac 100644 --- a/Documentation/ABI/testing/sysfs-bus-thunderbolt +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -297,6 +297,32 @@ Contact: Mika Westerberg <mika.westerberg@linux.intel.com> Description: Returns the current link mode. Possible values are "usb4", "tbt" and "none". +What: /sys/bus/thunderbolt/devices/usb4_portX/offline +Date: Sep 2021 +KernelVersion: v5.14 +Contact: Rajmohan Mani <rajmohan.mani@intel.com> +Description: Writing 1 to this attribute puts the USB4 port into + offline mode. Only allowed when there is nothing + connected to the port (link attribute returns "none"). + Once the port is in offline mode it does not receive any + hotplug events. This is used to update NVM firmware of + on-board retimers. Writing 0 puts the port back to + online mode. + + This attribute is only visible if the platform supports + powering on retimers when there is no cable connected. + +What: /sys/bus/thunderbolt/devices/usb4_portX/rescan +Date: Sep 2021 +KernelVersion: v5.14 +Contact: Rajmohan Mani <rajmohan.mani@intel.com> +Description: When the USB4 port is in offline mode writing 1 to this + attribute forces rescan of the sideband for on-board + retimers. Each retimer appear under the USB4 port as if + the USB4 link was up. These retimers act in the same way + as if the cable was connected so upgrading their NVM + firmware can be done the usual way. + What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/device Date: Oct 2020 KernelVersion: v5.9 diff --git a/Documentation/admin-guide/thunderbolt.rst b/Documentation/admin-guide/thunderbolt.rst index f18e881373c4..2ed79f41a411 100644 --- a/Documentation/admin-guide/thunderbolt.rst +++ b/Documentation/admin-guide/thunderbolt.rst @@ -256,6 +256,35 @@ Note names of the NVMem devices ``nvm_activeN`` and ``nvm_non_activeN`` depend on the order they are registered in the NVMem subsystem. N in the name is the identifier added by the NVMem subsystem. +Upgrading on-board retimer NVM when there is no cable connected +--------------------------------------------------------------- +If the platform supports, it may be possible to upgrade the retimer NVM +firmware even when there is nothing connected to the USB4 +ports. When this is the case the ``usb4_portX`` devices have two special +attributes: ``offline`` and ``rescan``. The way to upgrade the firmware +is to first put the USB4 port into offline mode:: + + # echo 1 > /sys/bus/thunderbolt/devices/0-0/usb4_port1/offline + +This step makes sure the port does not respond to any hotplug events, +and also ensures the retimers are powered on. The next step is to scan +for the retimers:: + + # echo 1 > /sys/bus/thunderbolt/devices/0-0/usb4_port1/rescan + +This enumerates and adds the on-board retimers. Now retimer NVM can be +upgraded in the same way than with cable connected (see previous +section). However, the retimer is not disconnected as we are offline +mode) so after writing ``1`` to ``nvm_authenticate`` one should wait for +5 or more seconds before running rescan again:: + + # echo 1 > /sys/bus/thunderbolt/devices/0-0/usb4_port1/rescan + +This point if everything went fine, the port can be put back to +functional state again:: + + # echo 0 > /sys/bus/thunderbolt/devices/0-0/usb4_port1/offline + Upgrading NVM when host controller is in safe mode -------------------------------------------------- If the existing NVM is not properly authenticated (or is missing) the diff --git a/drivers/thunderbolt/retimer.c b/drivers/thunderbolt/retimer.c index 2e5188fb1150..05af0feefe84 100644 --- a/drivers/thunderbolt/retimer.c +++ b/drivers/thunderbolt/retimer.c @@ -401,19 +401,18 @@ static struct tb_retimer *tb_port_find_retimer(struct tb_port *port, u8 index) /** * tb_retimer_scan() - Scan for on-board retimers under port * @port: USB4 port to scan + * @add: If true also registers found retimers * - * Tries to enumerate on-board retimers connected to @port. Found - * retimers are registered as children of @port. Does not scan for cable - * retimers for now. + * Brings the sideband into a state where retimers can be accessed. + * Then Tries to enumerate on-board retimers connected to @port. Found + * retimers are registered as children of @port if @add is set. Does + * not scan for cable retimers for now. */ -int tb_retimer_scan(struct tb_port *port) +int tb_retimer_scan(struct tb_port *port, bool add) { u32 status[TB_MAX_RETIMER_INDEX + 1] = {}; int ret, i, last_idx = 0; - if (!port->cap_usb4) - return 0; - /* * Send broadcast RT to make sure retimer indices facing this * port are set. @@ -423,6 +422,13 @@ int tb_retimer_scan(struct tb_port *port) return ret; /* + * Enable sideband channel for each retimer. We can do this + * regardless whether there is device connected or not. + */ + for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) + usb4_port_retimer_set_inbound_sbtx(port, i); + + /* * Before doing anything else, read the authentication status. * If the retimer has it set, store it for the new retimer * device instance. @@ -453,10 +459,10 @@ int tb_retimer_scan(struct tb_port *port) rt = tb_port_find_retimer(port, i); if (rt) { put_device(&rt->dev); - } else { + } else if (add) { ret = tb_retimer_add(port, i, status[i]); if (ret && ret != -EOPNOTSUPP) - return ret; + break; } } diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 7303c61a891a..dae59919e2bf 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -1153,6 +1153,33 @@ static int tb_port_start_lane_initialization(struct tb_port *port) return ret == -EINVAL ? 0 : ret; } +/* + * Returns true if the port had something (router, XDomain) connected + * before suspend. + */ +static bool tb_port_resume(struct tb_port *port) +{ + bool has_remote = tb_port_has_remote(port); + + if (port->usb4) { + usb4_port_device_resume(port->usb4); + } else if (!has_remote) { + /* + * For disconnected downstream lane adapters start lane + * initialization now so we detect future connects. + * + * For XDomain start the lane initialzation now so the + * link gets re-established. + * + * This is only needed for non-USB4 ports. + */ + if (!tb_is_upstream_port(port) || port->xdomain) + tb_port_start_lane_initialization(port); + } + + return has_remote || port->xdomain; +} + /** * tb_port_is_enabled() - Is the adapter port enabled * @port: Port to check @@ -2915,22 +2942,11 @@ int tb_switch_resume(struct tb_switch *sw) /* check for surviving downstream switches */ tb_switch_for_each_port(sw, port) { - if (!tb_port_has_remote(port) && !port->xdomain) { - /* - * For disconnected downstream lane adapters - * start lane initialization now so we detect - * future connects. - */ - if (!tb_is_upstream_port(port) && tb_port_is_null(port)) - tb_port_start_lane_initialization(port); + if (!tb_port_is_null(port)) + continue; + + if (!tb_port_resume(port)) continue; - } else if (port->xdomain) { - /* - * Start lane initialization for XDomain so the - * link gets re-established. - */ - tb_port_start_lane_initialization(port); - } if (tb_wait_for_port(port, true) <= 0) { tb_port_warn(port, @@ -2939,7 +2955,7 @@ int tb_switch_resume(struct tb_switch *sw) tb_sw_set_unplugged(port->remote->sw); else if (port->xdomain) port->xdomain->is_unplugged = true; - } else if (tb_port_has_remote(port) || port->xdomain) { + } else { /* * Always unlock the port so the downstream * switch/domain is accessible. diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 7e6dc2b03bed..bc6d568dbb89 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -595,7 +595,7 @@ static void tb_scan_port(struct tb_port *port) return; } - tb_retimer_scan(port); + tb_retimer_scan(port, true); sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, tb_downstream_route(port)); @@ -662,7 +662,7 @@ static void tb_scan_port(struct tb_port *port) tb_sw_warn(sw, "failed to enable TMU\n"); /* Scan upstream retimers */ - tb_retimer_scan(upstream_port); + tb_retimer_scan(upstream_port, true); /* * Create USB 3.x tunnels only when the switch is plugged to the diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 936518adca74..341e8443a22d 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -249,11 +249,13 @@ struct tb_port { * @port: Pointer to the lane 0 adapter * @can_offline: Does the port have necessary platform support to moved * it into offline mode and back + * @offline: The port is currently in offline mode */ struct usb4_port { struct device dev; struct tb_port *port; bool can_offline; + bool offline; }; /** @@ -1017,7 +1019,7 @@ void tb_xdomain_remove(struct tb_xdomain *xd); struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link, u8 depth); -int tb_retimer_scan(struct tb_port *port); +int tb_retimer_scan(struct tb_port *port, bool add); void tb_retimer_remove_all(struct tb_port *port); static inline bool tb_is_retimer(const struct device *dev) @@ -1105,6 +1107,7 @@ static inline struct usb4_port *tb_to_usb4_port_device(struct device *dev) struct usb4_port *usb4_port_device_add(struct tb_port *port); void usb4_port_device_remove(struct usb4_port *usb4); +int usb4_port_device_resume(struct usb4_port *usb4); /* Keep link controller awake during update */ #define QUIRK_FORCE_POWER_LINK_CONTROLLER BIT(0) diff --git a/drivers/thunderbolt/usb4_port.c b/drivers/thunderbolt/usb4_port.c index 520bbfd7bf33..765c74179598 100644 --- a/drivers/thunderbolt/usb4_port.c +++ b/drivers/thunderbolt/usb4_port.c @@ -44,8 +44,166 @@ static const struct attribute_group common_group = { .attrs = common_attrs, }; +static int usb4_port_offline(struct usb4_port *usb4) +{ + struct tb_port *port = usb4->port; + int ret; + + ret = tb_acpi_power_on_retimers(port); + if (ret) + return ret; + + ret = usb4_port_router_offline(port); + if (ret) { + tb_acpi_power_off_retimers(port); + return ret; + } + + ret = tb_retimer_scan(port, false); + if (ret) { + usb4_port_router_online(port); + tb_acpi_power_off_retimers(port); + } + + return ret; +} + +static void usb4_port_online(struct usb4_port *usb4) +{ + struct tb_port *port = usb4->port; + + usb4_port_router_online(port); + tb_acpi_power_off_retimers(port); +} + +static ssize_t offline_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct usb4_port *usb4 = tb_to_usb4_port_device(dev); + + return sysfs_emit(buf, "%d\n", usb4->offline); +} + +static ssize_t offline_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct usb4_port *usb4 = tb_to_usb4_port_device(dev); + struct tb_port *port = usb4->port; + struct tb *tb = port->sw->tb; + bool val; + int ret; + + ret = kstrtobool(buf, &val); + if (ret) + return ret; + + pm_runtime_get_sync(&usb4->dev); + + if (mutex_lock_interruptible(&tb->lock)) { + ret = -ERESTARTSYS; + goto out_rpm; + } + + if (val == usb4->offline) + goto out_unlock; + + /* Offline mode works only for ports that are not connected */ + if (tb_port_has_remote(port)) { + ret = -EBUSY; + goto out_unlock; + } + + if (val) { + ret = usb4_port_offline(usb4); + if (ret) + goto out_unlock; + } else { + usb4_port_online(usb4); + tb_retimer_remove_all(port); + } + + usb4->offline = val; + tb_port_dbg(port, "%s offline mode\n", val ? "enter" : "exit"); + +out_unlock: + mutex_unlock(&tb->lock); +out_rpm: + pm_runtime_mark_last_busy(&usb4->dev); + pm_runtime_put_autosuspend(&usb4->dev); + + return ret ? ret : count; +} +static DEVICE_ATTR_RW(offline); + +static ssize_t rescan_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct usb4_port *usb4 = tb_to_usb4_port_device(dev); + struct tb_port *port = usb4->port; + struct tb *tb = port->sw->tb; + bool val; + int ret; + + ret = kstrtobool(buf, &val); + if (ret) + return ret; + + if (!val) + return count; + + pm_runtime_get_sync(&usb4->dev); + + if (mutex_lock_interruptible(&tb->lock)) { + ret = -ERESTARTSYS; + goto out_rpm; + } + + /* Must be in offline mode already */ + if (!usb4->offline) { + ret = -EINVAL; + goto out_unlock; + } + + tb_retimer_remove_all(port); + ret = tb_retimer_scan(port, true); + +out_unlock: + mutex_unlock(&tb->lock); +out_rpm: + pm_runtime_mark_last_busy(&usb4->dev); + pm_runtime_put_autosuspend(&usb4->dev); + + return ret ? ret : count; +} +static DEVICE_ATTR_WO(rescan); + +static struct attribute *service_attrs[] = { + &dev_attr_offline.attr, + &dev_attr_rescan.attr, + NULL +}; + +static umode_t service_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct usb4_port *usb4 = tb_to_usb4_port_device(dev); + + /* + * Always need some platform help to cycle the modes so that + * retimers can be accessed through the sideband. + */ + return usb4->can_offline ? attr->mode : 0; +} + +static const struct attribute_group service_group = { + .attrs = service_attrs, + .is_visible = service_attr_is_visible, +}; + static const struct attribute_group *usb4_port_device_groups[] = { &common_group, + &service_group, NULL }; @@ -110,3 +268,14 @@ void usb4_port_device_remove(struct usb4_port *usb4) { device_unregister(&usb4->dev); } + +/** + * usb4_port_device_resume() - Resumes USB4 port device + * @usb4: USB4 port device + * + * Used to resume USB4 port device after sleep state. + */ +int usb4_port_device_resume(struct usb4_port *usb4) +{ + return usb4->offline ? usb4_port_offline(usb4) : 0; +} |