thunderbolt: Expose details about tunneling

index 321a5bcfce65..a1b4a695080e 100644
@@ -1835,6 +1835,39 @@ static void tb_switch_release(struct device *dev)
 	kfree(sw);
 }
 
+static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct tb_switch *sw = tb_to_switch(dev);
+	const char *type;
+
+	if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
+		if (add_uevent_var(env, "USB4_VERSION=1.0"))
+			return -ENOMEM;
+	}
+
+	if (!tb_route(sw)) {
+		type = "host";
+	} else {
+		const struct tb_port *port;
+		bool hub = false;
+
+		/* Device is hub if it has any downstream ports */
+		tb_switch_for_each_port(sw, port) {
+			if (!port->disabled && !tb_is_upstream_port(port) &&
+			     tb_port_is_null(port)) {
+				hub = true;
+				break;
+			}
+		}
+
+		type = hub ? "hub" : "device";
+	}
+
+	if (add_uevent_var(env, "USB4_TYPE=%s", type))
+		return -ENOMEM;
+	return 0;
+}
+
 /*
  * Currently only need to provide the callbacks. Everything else is handled
  * in the connection manager.

@@ -1868,6 +1901,7 @@ static const struct dev_pm_ops tb_switch_pm_ops = {
 struct device_type tb_switch_type = {
 	.name = "thunderbolt_device",
 	.release = tb_switch_release,
+	.uevent = tb_switch_uevent,
 	.pm = &tb_switch_pm_ops,
 };
 

index a1b4a695080e..fbcc920e327c 100644
@@ -1746,6 +1746,18 @@ static struct attribute *switch_attrs[] = {
 	NULL,
 };
 
+static bool has_port(const struct tb_switch *sw, enum tb_port_type type)
+{
+	const struct tb_port *port;
+
+	tb_switch_for_each_port(sw, port) {
+		if (!port->disabled && port->config.type == type)
+			return true;
+	}
+
+	return false;
+}
+
 static umode_t switch_attr_is_visible(struct kobject *kobj,
 				      struct attribute *attr, int n)
 {

@@ -1754,7 +1766,8 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 
 	if (attr == &dev_attr_authorized.attr) {
 		if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
-		    sw->tb->security_level == TB_SECURITY_DPONLY)
+		    sw->tb->security_level == TB_SECURITY_DPONLY ||
+		    !has_port(sw, TB_TYPE_PCIE_UP))
 			return 0;
 	} else if (attr == &dev_attr_device.attr) {
 		if (!sw->device)

index 98f4056f89ff..e2787444abb0 100644
@@ -282,11 +282,21 @@ static ssize_t security_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(security);
 
+static ssize_t tunneling_details_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	const struct tb *tb = container_of(dev, struct tb, dev);
+
+	return sysfs_emit(buf, "%d\n", !!(tb->cm_caps & TB_CAP_TUNNEL_DETAILS));
+}
+static DEVICE_ATTR_RO(tunneling_details);
+
 static struct attribute *domain_attrs[] = {
 	&dev_attr_boot_acl.attr,
 	&dev_attr_deauthorization.attr,
 	&dev_attr_iommu_dma_protection.attr,
 	&dev_attr_security.attr,
+	&dev_attr_tunneling_details.attr,
 	NULL,
 };
 

index fbcc920e327c..b2c0cfec03d5 100644
@@ -1493,6 +1493,15 @@ device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR_RO(device_name);
 
+static ssize_t dp_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct tb_switch *sw = tb_to_switch(dev);
+
+	return sysfs_emit(buf, "%u\n", sw->dp);
+}
+static DEVICE_ATTR_RO(dp);
+
 static ssize_t
 generation_show(struct device *dev, struct device_attribute *attr, char *buf)
 {

@@ -1699,6 +1708,15 @@ static ssize_t nvm_version_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(nvm_version);
 
+static ssize_t usb3_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct tb_switch *sw = tb_to_switch(dev);
+
+	return sysfs_emit(buf, "%u\n", sw->usb3);
+}
+static DEVICE_ATTR_RO(usb3);
+
 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
 			   char *buf)
 {

@@ -1731,6 +1749,7 @@ static struct attribute *switch_attrs[] = {
 	&dev_attr_boot.attr,
 	&dev_attr_device.attr,
 	&dev_attr_device_name.attr,
+	&dev_attr_dp.attr,
 	&dev_attr_generation.attr,
 	&dev_attr_key.attr,
 	&dev_attr_nvm_authenticate.attr,

@@ -1740,6 +1759,7 @@ static struct attribute *switch_attrs[] = {
 	&dev_attr_rx_lanes.attr,
 	&dev_attr_tx_speed.attr,
 	&dev_attr_tx_lanes.attr,
+	&dev_attr_usb3.attr,
 	&dev_attr_vendor.attr,
 	&dev_attr_vendor_name.attr,
 	&dev_attr_unique_id.attr,

@@ -1763,6 +1783,7 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 {
 	struct device *dev = kobj_to_dev(kobj);
 	struct tb_switch *sw = tb_to_switch(dev);
+	const struct tb *tb = sw->tb;
 
 	if (attr == &dev_attr_authorized.attr) {
 		if (sw->tb->security_level == TB_SECURITY_NOPCIE ||

@@ -1775,6 +1796,10 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 	} else if (attr == &dev_attr_device_name.attr) {
 		if (!sw->device_name)
 			return 0;
+	} else if (attr == &dev_attr_dp.attr) {
+		if (!(tb->cm_caps & TB_CAP_TUNNEL_DETAILS) ||
+		    !has_port(sw, TB_TYPE_DP_HDMI_OUT))
+			return 0;
 	} else if (attr == &dev_attr_vendor.attr)  {
 		if (!sw->vendor)
 			return 0;

@@ -1794,6 +1819,10 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 		if (tb_route(sw))
 			return attr->mode;
 		return 0;
+	} else if (attr == &dev_attr_usb3.attr) {
+		if (!(tb->cm_caps & TB_CAP_TUNNEL_DETAILS) ||
+		    !has_port(sw, TB_TYPE_USB3_UP))
+			return 0;
 	} else if (attr == &dev_attr_nvm_authenticate.attr) {
 		if (nvm_upgradeable(sw))
 			return attr->mode;

119 lines not on this page · raw message

index 9790e9f13d2b..eb93c41a0881 100644
@@ -123,6 +123,8 @@ struct tb_switch_tmu {
  * @safe_mode: The switch is in safe-mode
  * @boot: Whether the switch was already authorized on boot or not
  * @rpm: The switch supports runtime PM
+ * @usb3: Number of USB 3.x tunnels to this switch (0 or 1)
+ * @dp: Number of DisplayPort tunnels ending to this switch
  * @authorized: Whether the switch is authorized by user or policy
  * @security_level: Switch supported security level
  * @debugfs_dir: Pointer to the debugfs structure

@@ -167,6 +169,8 @@ struct tb_switch {
 	bool safe_mode;
 	bool boot;
 	bool rpm;
+	unsigned int usb3;
+	unsigned int dp;
 	unsigned int authorized;
 	enum tb_security_level security_level;
 	struct dentry *debugfs_dir;

index e7c96c37174f..dc6cfb4237d1 100644
@@ -57,6 +57,9 @@ enum tb_security_level {
 	TB_SECURITY_NOPCIE,
 };
 
+/* Connection manager exposes details about tunneling */
+#define TB_CAP_TUNNEL_DETAILS	BIT(0)
+
 /**
  * struct tb - main thunderbolt bus structure
  * @dev: Domain device

@@ -67,6 +70,8 @@ enum tb_security_level {
  * @wq: Ordered workqueue for all domain specific work
  * @root_switch: Root switch of this domain
  * @cm_ops: Connection manager specific operations vector
+ * @cm_caps: Extra capabilities supported by the connection manager
+ *	     implementation
  * @index: Linux assigned domain number
  * @security_level: Current security level
  * @nboot_acl: Number of boot ACLs the domain supports

@@ -80,6 +85,7 @@ struct tb {
 	struct workqueue_struct *wq;
 	struct tb_switch *root_switch;
 	const struct tb_cm_ops *cm_ops;
+	unsigned int cm_caps;
 	int index;
 	enum tb_security_level security_level;
 	size_t nboot_acl;