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-rw-r--r--Documentation/ABI/testing/sysfs-bus-thunderbolt22
-rw-r--r--drivers/thunderbolt/eeprom.c2
-rw-r--r--drivers/thunderbolt/switch.c261
-rw-r--r--drivers/thunderbolt/tb.c40
-rw-r--r--drivers/thunderbolt/tb.h45
5 files changed, 303 insertions, 67 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt
new file mode 100644
index 000000000000..9f1bd0086938
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -0,0 +1,22 @@
+What: /sys/bus/thunderbolt/devices/.../device
+Date: Sep 2017
+KernelVersion: 4.13
+Contact: thunderbolt-software@lists.01.org
+Description: This attribute contains id of this device extracted from
+ the device DROM.
+
+What: /sys/bus/thunderbolt/devices/.../vendor
+Date: Sep 2017
+KernelVersion: 4.13
+Contact: thunderbolt-software@lists.01.org
+Description: This attribute contains vendor id of this device extracted
+ from the device DROM.
+
+What: /sys/bus/thunderbolt/devices/.../unique_id
+Date: Sep 2017
+KernelVersion: 4.13
+Contact: thunderbolt-software@lists.01.org
+Description: This attribute contains unique_id string of this device.
+ This is either read from hardware registers (UUID on
+ newer hardware) or based on UID from the device DROM.
+ Can be used to uniquely identify particular device.
diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
index eb2179c98b09..7e485e3ef27e 100644
--- a/drivers/thunderbolt/eeprom.c
+++ b/drivers/thunderbolt/eeprom.c
@@ -479,6 +479,8 @@ parse:
goto err;
}
sw->uid = header->uid;
+ sw->vendor = header->vendor_id;
+ sw->device = header->model_id;
crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len);
if (crc != header->data_crc32) {
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index b379b4183bac..0475bfc6c208 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -281,6 +281,9 @@ static int tb_plug_events_active(struct tb_switch *sw, bool active)
u32 data;
int res;
+ if (!sw->config.enabled)
+ return 0;
+
sw->config.plug_events_delay = 0xff;
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
if (res)
@@ -307,36 +310,79 @@ static int tb_plug_events_active(struct tb_switch *sw, bool active)
sw->cap_plug_events + 1, 1);
}
+static ssize_t device_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tb_switch *sw = tb_to_switch(dev);
-/**
- * tb_switch_free() - free a tb_switch and all downstream switches
- */
-void tb_switch_free(struct tb_switch *sw)
+ return sprintf(buf, "%#x\n", sw->device);
+}
+static DEVICE_ATTR_RO(device);
+
+static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- int i;
- /* port 0 is the switch itself and never has a remote */
- for (i = 1; i <= sw->config.max_port_number; i++) {
- if (tb_is_upstream_port(&sw->ports[i]))
- continue;
- if (sw->ports[i].remote)
- tb_switch_free(sw->ports[i].remote->sw);
- sw->ports[i].remote = NULL;
- }
+ struct tb_switch *sw = tb_to_switch(dev);
- if (!sw->is_unplugged)
- tb_plug_events_active(sw, false);
+ return sprintf(buf, "%#x\n", sw->vendor);
+}
+static DEVICE_ATTR_RO(vendor);
+
+static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tb_switch *sw = tb_to_switch(dev);
+
+ return sprintf(buf, "%pUb\n", sw->uuid);
+}
+static DEVICE_ATTR_RO(unique_id);
+
+static struct attribute *switch_attrs[] = {
+ &dev_attr_device.attr,
+ &dev_attr_vendor.attr,
+ &dev_attr_unique_id.attr,
+ NULL,
+};
+
+static struct attribute_group switch_group = {
+ .attrs = switch_attrs,
+};
+static const struct attribute_group *switch_groups[] = {
+ &switch_group,
+ NULL,
+};
+
+static void tb_switch_release(struct device *dev)
+{
+ struct tb_switch *sw = tb_to_switch(dev);
+
+ kfree(sw->uuid);
kfree(sw->ports);
kfree(sw->drom);
kfree(sw);
}
+struct device_type tb_switch_type = {
+ .name = "thunderbolt_device",
+ .release = tb_switch_release,
+};
+
/**
- * tb_switch_alloc() - allocate and initialize a switch
+ * tb_switch_alloc() - allocate a switch
+ * @tb: Pointer to the owning domain
+ * @parent: Parent device for this switch
+ * @route: Route string for this switch
*
- * Return: Returns a NULL on failure.
+ * Allocates and initializes a switch. Will not upload configuration to
+ * the switch. For that you need to call tb_switch_configure()
+ * separately. The returned switch should be released by calling
+ * tb_switch_put().
+ *
+ * Return: Pointer to the allocated switch or %NULL in case of failure
*/
-struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
+struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
+ u64 route)
{
int i;
int cap;
@@ -351,11 +397,9 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
sw->tb = tb;
if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5))
- goto err;
- tb_info(tb,
- "initializing Switch at %#llx (depth: %d, up port: %d)\n",
- route, tb_route_length(route), upstream_port);
- tb_info(tb, "old switch config:\n");
+ goto err_free_sw_ports;
+
+ tb_info(tb, "current switch config:\n");
tb_dump_switch(tb, &sw->config);
/* configure switch */
@@ -363,30 +407,13 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
sw->config.depth = tb_route_length(route);
sw->config.route_lo = route;
sw->config.route_hi = route >> 32;
- sw->config.enabled = 1;
- /* from here on we may use the tb_sw_* functions & macros */
-
- if (sw->config.vendor_id != 0x8086)
- tb_sw_warn(sw, "unknown switch vendor id %#x\n",
- sw->config.vendor_id);
-
- if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE &&
- sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C &&
- sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE &&
- sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE &&
- sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE)
- tb_sw_warn(sw, "unsupported switch device id %#x\n",
- sw->config.device_id);
-
- /* upload configuration */
- if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
- goto err;
+ sw->config.enabled = 0;
/* initialize ports */
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
GFP_KERNEL);
if (!sw->ports)
- goto err;
+ goto err_free_sw_ports;
for (i = 0; i <= sw->config.max_port_number; i++) {
/* minimum setup for tb_find_cap and tb_drom_read to work */
@@ -397,35 +424,161 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
if (cap < 0) {
tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
- goto err;
+ goto err_free_sw_ports;
}
sw->cap_plug_events = cap;
+ device_initialize(&sw->dev);
+ sw->dev.parent = parent;
+ sw->dev.bus = &tb_bus_type;
+ sw->dev.type = &tb_switch_type;
+ sw->dev.groups = switch_groups;
+ dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
+
+ return sw;
+
+err_free_sw_ports:
+ kfree(sw->ports);
+ kfree(sw);
+
+ return NULL;
+}
+
+/**
+ * tb_switch_configure() - Uploads configuration to the switch
+ * @sw: Switch to configure
+ *
+ * Call this function before the switch is added to the system. It will
+ * upload configuration to the switch and makes it available for the
+ * connection manager to use.
+ *
+ * Return: %0 in case of success and negative errno in case of failure
+ */
+int tb_switch_configure(struct tb_switch *sw)
+{
+ struct tb *tb = sw->tb;
+ u64 route;
+ int ret;
+
+ route = tb_route(sw);
+ tb_info(tb,
+ "initializing Switch at %#llx (depth: %d, up port: %d)\n",
+ route, tb_route_length(route), sw->config.upstream_port_number);
+
+ if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
+ tb_sw_warn(sw, "unknown switch vendor id %#x\n",
+ sw->config.vendor_id);
+
+ if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE &&
+ sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C &&
+ sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE &&
+ sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE &&
+ sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE)
+ tb_sw_warn(sw, "unsupported switch device id %#x\n",
+ sw->config.device_id);
+
+ sw->config.enabled = 1;
+
+ /* upload configuration */
+ ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
+ if (ret)
+ return ret;
+
+ return tb_plug_events_active(sw, true);
+}
+
+static void tb_switch_set_uuid(struct tb_switch *sw)
+{
+ u32 uuid[4];
+ int cap;
+
+ if (sw->uuid)
+ return;
+
+ /*
+ * The newer controllers include fused UUID as part of link
+ * controller specific registers
+ */
+ cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
+ if (cap > 0) {
+ tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
+ } else {
+ /*
+ * ICM generates UUID based on UID and fills the upper
+ * two words with ones. This is not strictly following
+ * UUID format but we want to be compatible with it so
+ * we do the same here.
+ */
+ uuid[0] = sw->uid & 0xffffffff;
+ uuid[1] = (sw->uid >> 32) & 0xffffffff;
+ uuid[2] = 0xffffffff;
+ uuid[3] = 0xffffffff;
+ }
+
+ sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
+}
+
+/**
+ * tb_switch_add() - Add a switch to the domain
+ * @sw: Switch to add
+ *
+ * This is the last step in adding switch to the domain. It will read
+ * identification information from DROM and initializes ports so that
+ * they can be used to connect other switches. The switch will be
+ * exposed to the userspace when this function successfully returns. To
+ * remove and release the switch, call tb_switch_remove().
+ *
+ * Return: %0 in case of success and negative errno in case of failure
+ */
+int tb_switch_add(struct tb_switch *sw)
+{
+ int i, ret;
+
/* read drom */
if (tb_drom_read(sw))
tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n");
tb_sw_info(sw, "uid: %#llx\n", sw->uid);
+ tb_switch_set_uuid(sw);
+
for (i = 0; i <= sw->config.max_port_number; i++) {
if (sw->ports[i].disabled) {
tb_port_info(&sw->ports[i], "disabled by eeprom\n");
continue;
}
- if (tb_init_port(&sw->ports[i]))
- goto err;
+ ret = tb_init_port(&sw->ports[i]);
+ if (ret)
+ return ret;
}
- /* TODO: I2C, IECS, link controller */
+ return device_add(&sw->dev);
+}
- if (tb_plug_events_active(sw, true))
- goto err;
+/**
+ * tb_switch_remove() - Remove and release a switch
+ * @sw: Switch to remove
+ *
+ * This will remove the switch from the domain and release it after last
+ * reference count drops to zero. If there are switches connected below
+ * this switch, they will be removed as well.
+ */
+void tb_switch_remove(struct tb_switch *sw)
+{
+ int i;
- return sw;
-err:
- kfree(sw->ports);
- kfree(sw->drom);
- kfree(sw);
- return NULL;
+ /* port 0 is the switch itself and never has a remote */
+ for (i = 1; i <= sw->config.max_port_number; i++) {
+ if (tb_is_upstream_port(&sw->ports[i]))
+ continue;
+ if (sw->ports[i].remote)
+ tb_switch_remove(sw->ports[i].remote->sw);
+ sw->ports[i].remote = NULL;
+ }
+
+ if (!sw->is_unplugged)
+ tb_plug_events_active(sw, false);
+
+ device_unregister(&sw->dev);
}
/**
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 9f00a0f28d53..94ecac012428 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -61,9 +61,21 @@ static void tb_scan_port(struct tb_port *port)
tb_port_WARN(port, "port already has a remote!\n");
return;
}
- sw = tb_switch_alloc(port->sw->tb, tb_downstream_route(port));
+ sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
+ tb_downstream_route(port));
if (!sw)
return;
+
+ if (tb_switch_configure(sw)) {
+ tb_switch_put(sw);
+ return;
+ }
+
+ if (tb_switch_add(sw)) {
+ tb_switch_put(sw);
+ return;
+ }
+
port->remote = tb_upstream_port(sw);
tb_upstream_port(sw)->remote = port;
tb_scan_switch(sw);
@@ -100,7 +112,7 @@ static void tb_free_unplugged_children(struct tb_switch *sw)
if (!port->remote)
continue;
if (port->remote->sw->is_unplugged) {
- tb_switch_free(port->remote->sw);
+ tb_switch_remove(port->remote->sw);
port->remote = NULL;
} else {
tb_free_unplugged_children(port->remote->sw);
@@ -266,7 +278,7 @@ static void tb_handle_hotplug(struct work_struct *work)
tb_port_info(port, "unplugged\n");
tb_sw_set_unplugged(port->remote->sw);
tb_free_invalid_tunnels(tb);
- tb_switch_free(port->remote->sw);
+ tb_switch_remove(port->remote->sw);
port->remote = NULL;
} else {
tb_port_info(port,
@@ -325,22 +337,32 @@ static void tb_stop(struct tb *tb)
tb_pci_deactivate(tunnel);
tb_pci_free(tunnel);
}
-
- if (tb->root_switch)
- tb_switch_free(tb->root_switch);
- tb->root_switch = NULL;
-
+ tb_switch_remove(tb->root_switch);
tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
}
static int tb_start(struct tb *tb)
{
struct tb_cm *tcm = tb_priv(tb);
+ int ret;
- tb->root_switch = tb_switch_alloc(tb, 0);
+ tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
if (!tb->root_switch)
return -ENOMEM;
+ 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;
+ }
+
/* Full scan to discover devices added before the driver was loaded. */
tb_scan_switch(tb->root_switch);
tb_activate_pcie_devices(tb);
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 5fab4c44f124..f7dfe733d71a 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -8,20 +8,36 @@
#define TB_H_
#include <linux/pci.h>
+#include <linux/uuid.h>
#include "tb_regs.h"
#include "ctl.h"
/**
* struct tb_switch - a thunderbolt switch
+ * @dev: Device for the switch
+ * @config: Switch configuration
+ * @ports: Ports in this switch
+ * @tb: Pointer to the domain the switch belongs to
+ * @uid: Unique ID of the switch
+ * @uuid: UUID of the switch (or %NULL if not supported)
+ * @vendor: Vendor ID of the switch
+ * @device: Device ID of the switch
+ * @cap_plug_events: Offset to the plug events capability (%0 if not found)
+ * @is_unplugged: The switch is going away
+ * @drom: DROM of the switch (%NULL if not found)
*/
struct tb_switch {
+ struct device dev;
struct tb_regs_switch_header config;
struct tb_port *ports;
struct tb *tb;
u64 uid;
- int cap_plug_events; /* offset, zero if not found */
- bool is_unplugged; /* unplugged, will go away */
+ uuid_be *uuid;
+ u16 vendor;
+ u16 device;
+ int cap_plug_events;
+ bool is_unplugged;
u8 *drom;
};
@@ -242,6 +258,7 @@ struct tb *tb_probe(struct tb_nhi *nhi);
extern struct bus_type tb_bus_type;
extern struct device_type tb_domain_type;
+extern struct device_type tb_switch_type;
int tb_domain_init(void);
void tb_domain_exit(void);
@@ -257,14 +274,34 @@ static inline void tb_domain_put(struct tb *tb)
put_device(&tb->dev);
}
-struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
-void tb_switch_free(struct tb_switch *sw);
+struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
+ u64 route);
+int tb_switch_configure(struct tb_switch *sw);
+int tb_switch_add(struct tb_switch *sw);
+void tb_switch_remove(struct tb_switch *sw);
void tb_switch_suspend(struct tb_switch *sw);
int tb_switch_resume(struct tb_switch *sw);
int tb_switch_reset(struct tb *tb, u64 route);
void tb_sw_set_unplugged(struct tb_switch *sw);
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
+static inline void tb_switch_put(struct tb_switch *sw)
+{
+ put_device(&sw->dev);
+}
+
+static inline bool tb_is_switch(const struct device *dev)
+{
+ return dev->type == &tb_switch_type;
+}
+
+static inline struct tb_switch *tb_to_switch(struct device *dev)
+{
+ if (tb_is_switch(dev))
+ return container_of(dev, struct tb_switch, dev);
+ return NULL;
+}
+
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
int tb_port_add_nfc_credits(struct tb_port *port, int credits);
int tb_port_clear_counter(struct tb_port *port, int counter);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 16:11:48 +0000