thunderbolt: Add support for full PCIe daisy chains

Currently the software connection manager (tb.c) has only supported
creating a single PCIe tunnel, no PCIe device daisy chaining has been
supported so far. This updates the software connection manager so that
it now can create PCIe tunnels for full chain of six devices.

Because PCIe allows DMA and opens possibility for DMA attacks we change
security level to "user" meaning that PCIe tunneling requires that the
userspace authorizes the devices first. This makes it possible to block
PCIe tunneling completely while still allowing other types of tunnels to
be automatically created.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index a558adf6ff10..5b5ba8919086 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -350,6 +350,11 @@ static inline bool tb_port_has_remote(const struct tb_port *port)
 	return true;
 }
 
+static inline bool tb_port_is_pcie_down(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_PCIE_DOWN;
+}
+
 static inline bool tb_port_is_pcie_up(const struct tb_port *port)
 {
 	return port && port->config.type == TB_TYPE_PCIE_UP;
@@ -532,6 +537,28 @@ static inline bool tb_switch_is_er(const struct tb_switch *sw)
 	return sw->config.device_id == PCI_DEVICE_ID_INTEL_EAGLE_RIDGE;
 }
 
+static inline bool tb_switch_is_cr(const struct tb_switch *sw)
+{
+	switch (sw->config.device_id) {
+	case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
+	case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static inline bool tb_switch_is_fr(const struct tb_switch *sw)
+{
+	switch (sw->config.device_id) {
+	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
+	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
+		return true;
+	default:
+		return false;
+	}
+}
+
 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);