From: Yehezkel Bernat <yehezkel.ber...@intel.com>

In various cases, Thunderbolt device can be connected by ICM on boot
without waiting for approval from user. Most cases are related to
OEM-specific BIOS configurations. This information is interesting for
user-space as if the device isn't in SW ACL, it may create a friction in
the user experience where the device is automatically authorized if it's
connected on boot but requires an explicit user action if connected
after OS is up. User-space can use this information to suggest adding
the device to SW ACL for auto-authorization on later connections.

Signed-off-by: Yehezkel Bernat <yehezkel.ber...@intel.com>
Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
---
 Documentation/ABI/testing/sysfs-bus-thunderbolt |  7 +++++++
 drivers/thunderbolt/icm.c                       | 12 ++++++++----
 drivers/thunderbolt/switch.c                    | 14 ++++++++++++++
 drivers/thunderbolt/tb.h                        |  2 ++
 drivers/thunderbolt/tb_msgs.h                   |  1 +
 5 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt 
b/Documentation/ABI/testing/sysfs-bus-thunderbolt
index 93798c02e28b..1f145b727d76 100644
--- a/Documentation/ABI/testing/sysfs-bus-thunderbolt
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -38,6 +38,13 @@ Description: This attribute is used to authorize Thunderbolt 
devices
                   the device did not contain a key at all, and
                   EKEYREJECTED if the challenge response did not match.
 
+What: /sys/bus/thunderbolt/devices/.../boot
+Date:          Jun 2018
+KernelVersion: 4.17
+Contact:       thunderbolt-softw...@lists.01.org
+Description:   This attribute contains 1 if Thunderbolt device was already
+               authorized on boot and 0 otherwise.
+
 What: /sys/bus/thunderbolt/devices/.../key
 Date:          Sep 2017
 KernelVersion: 4.13
diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
index 5d3cd740b71f..bece5540b06b 100644
--- a/drivers/thunderbolt/icm.c
+++ b/drivers/thunderbolt/icm.c
@@ -402,7 +402,7 @@ static int icm_fr_disconnect_xdomain_paths(struct tb *tb, 
struct tb_xdomain *xd)
 static void add_switch(struct tb_switch *parent_sw, u64 route,
                       const uuid_t *uuid, u8 connection_id, u8 connection_key,
                       u8 link, u8 depth, enum tb_security_level security_level,
-                      bool authorized)
+                      bool authorized, bool boot)
 {
        struct tb_switch *sw;
 
@@ -417,6 +417,7 @@ static void add_switch(struct tb_switch *parent_sw, u64 
route,
        sw->depth = depth;
        sw->authorized = authorized;
        sw->security_level = security_level;
+       sw->boot = boot;
 
        /* Link the two switches now */
        tb_port_at(route, parent_sw)->remote = tb_upstream_port(sw);
@@ -431,7 +432,7 @@ static void add_switch(struct tb_switch *parent_sw, u64 
route,
 
 static void update_switch(struct tb_switch *parent_sw, struct tb_switch *sw,
                          u64 route, u8 connection_id, u8 connection_key,
-                         u8 link, u8 depth)
+                         u8 link, u8 depth, bool boot)
 {
        /* Disconnect from parent */
        tb_port_at(tb_route(sw), parent_sw)->remote = NULL;
@@ -445,6 +446,7 @@ static void update_switch(struct tb_switch *parent_sw, 
struct tb_switch *sw,
        sw->connection_key = connection_key;
        sw->link = link;
        sw->depth = depth;
+       sw->boot = boot;
 
        /* This switch still exists */
        sw->is_unplugged = false;
@@ -504,6 +506,7 @@ icm_fr_device_connected(struct tb *tb, const struct 
icm_pkg_header *hdr)
        bool authorized = false;
        struct tb_xdomain *xd;
        u8 link, depth;
+       bool boot;
        u64 route;
        int ret;
 
@@ -513,6 +516,7 @@ icm_fr_device_connected(struct tb *tb, const struct 
icm_pkg_header *hdr)
        authorized = pkg->link_info & ICM_LINK_INFO_APPROVED;
        security_level = (pkg->hdr.flags & ICM_FLAGS_SLEVEL_MASK) >>
                         ICM_FLAGS_SLEVEL_SHIFT;
+       boot = pkg->link_info & ICM_LINK_INFO_BOOT;
 
        if (pkg->link_info & ICM_LINK_INFO_REJECTED) {
                tb_info(tb, "switch at %u.%u was rejected by ICM firmware 
because topology limit exceeded\n",
@@ -546,7 +550,7 @@ icm_fr_device_connected(struct tb *tb, const struct 
icm_pkg_header *hdr)
                if (sw->depth == depth && sw_phy_port == phy_port &&
                    !!sw->authorized == authorized) {
                        update_switch(parent_sw, sw, route, pkg->connection_id,
-                                     pkg->connection_key, link, depth);
+                                     pkg->connection_key, link, depth, boot);
                        tb_switch_put(sw);
                        return;
                }
@@ -595,7 +599,7 @@ icm_fr_device_connected(struct tb *tb, const struct 
icm_pkg_header *hdr)
 
        add_switch(parent_sw, route, &pkg->ep_uuid, pkg->connection_id,
                   pkg->connection_key, link, depth, security_level,
-                  authorized);
+                  authorized, boot);
 
        tb_switch_put(parent_sw);
 }
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 4e2b2097bbfc..e9e30aaab2a3 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -775,6 +775,15 @@ static ssize_t authorized_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(authorized);
 
+static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
+                        char *buf)
+{
+       struct tb_switch *sw = tb_to_switch(dev);
+
+       return sprintf(buf, "%u\n", sw->boot);
+}
+static DEVICE_ATTR_RO(boot);
+
 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
                           char *buf)
 {
@@ -951,6 +960,7 @@ static DEVICE_ATTR_RO(unique_id);
 
 static struct attribute *switch_attrs[] = {
        &dev_attr_authorized.attr,
+       &dev_attr_boot.attr,
        &dev_attr_device.attr,
        &dev_attr_device_name.attr,
        &dev_attr_key.attr,
@@ -979,6 +989,10 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
                if (sw->dma_port)
                        return attr->mode;
                return 0;
+       } else if (attr == &dev_attr_boot.attr) {
+               if (tb_route(sw))
+                       return attr->mode;
+               return 0;
        }
 
        return sw->safe_mode ? 0 : attr->mode;
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 2cd6085a6e10..9c9cef875ca8 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -66,6 +66,7 @@ struct tb_switch_nvm {
  * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
  * @no_nvm_upgrade: Prevent NVM upgrade of this switch
  * @safe_mode: The switch is in safe-mode
+ * @boot: Whether the switch was already authorized on boot or not
  * @authorized: Whether the switch is authorized by user or policy
  * @work: Work used to automatically authorize a switch
  * @security_level: Switch supported security level
@@ -99,6 +100,7 @@ struct tb_switch {
        struct tb_switch_nvm *nvm;
        bool no_nvm_upgrade;
        bool safe_mode;
+       bool boot;
        unsigned int authorized;
        struct work_struct work;
        enum tb_security_level security_level;
diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h
index 931db2a7c7b3..9f52f842257a 100644
--- a/drivers/thunderbolt/tb_msgs.h
+++ b/drivers/thunderbolt/tb_msgs.h
@@ -179,6 +179,7 @@ struct icm_fr_event_device_connected {
 #define ICM_LINK_INFO_DEPTH_MASK       GENMASK(7, 4)
 #define ICM_LINK_INFO_APPROVED         BIT(8)
 #define ICM_LINK_INFO_REJECTED         BIT(9)
+#define ICM_LINK_INFO_BOOT             BIT(10)
 
 struct icm_fr_pkg_approve_device {
        struct icm_pkg_header hdr;
-- 
2.16.1

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