Merge tag 'thunderbolt-for-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into char-misc-next

Mika writes:

thunderbolt: Changes for v5.2 merge window

This improves software connection manager on older Apple systems with
Thunderbolt 1 and 2 controller to support full PCIe daisy chains,
Display Port tunneling and P2P networking. There are also fixes for
potential NULL pointer dereferences at various places in the driver.

* tag 'thunderbolt-for-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: (44 commits)
  thunderbolt: Make priority unsigned in struct tb_path
  thunderbolt: Start firmware on Titan Ridge Apple systems
  thunderbolt: Reword output of tb_dump_hop()
  thunderbolt: Make rest of the logging to happen at debug level
  thunderbolt: Make __TB_[SW|PORT]_PRINT take const parameters
  thunderbolt: Add support for XDomain connections
  thunderbolt: Make tb_switch_alloc() return ERR_PTR()
  thunderbolt: Add support for DMA tunnels
  thunderbolt: Add XDomain UUID exchange support
  thunderbolt: Run tb_xdp_handle_request() in system workqueue
  thunderbolt: Do not tear down tunnels when driver is unloaded
  thunderbolt: Add support for Display Port tunnels
  thunderbolt: Rework NFC credits handling
  thunderbolt: Generalize port finding routines to support all port types
  thunderbolt: Scan only valid NULL adapter ports in hotplug
  thunderbolt: Add support for full PCIe daisy chains
  thunderbolt: Discover preboot PCIe paths the boot firmware established
  thunderbolt: Deactivate all paths before restarting them
  thunderbolt: Extend tunnel creation to more than 2 adjacent switches
  thunderbolt: Add helper function to iterate from one port to another
  ...

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/thunderbolt/tunnel.h b/drivers/thunderbolt/tunnel.h
new file mode 100644
index 000000000000..c68bbcd3a62c
--- /dev/null
+++ b/drivers/thunderbolt/tunnel.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Thunderbolt driver - Tunneling support
+ *
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
+ * Copyright (C) 2019, Intel Corporation
+ */
+
+#ifndef TB_TUNNEL_H_
+#define TB_TUNNEL_H_
+
+#include "tb.h"
+
+enum tb_tunnel_type {
+	TB_TUNNEL_PCI,
+	TB_TUNNEL_DP,
+	TB_TUNNEL_DMA,
+};
+
+/**
+ * struct tb_tunnel - Tunnel between two ports
+ * @tb: Pointer to the domain
+ * @src_port: Source port of the tunnel
+ * @dst_port: Destination port of the tunnel. For discovered incomplete
+ *	      tunnels may be %NULL or null adapter port instead.
+ * @paths: All paths required by the tunnel
+ * @npaths: Number of paths in @paths
+ * @init: Optional tunnel specific initialization
+ * @activate: Optional tunnel specific activation/deactivation
+ * @list: Tunnels are linked using this field
+ * @type: Type of the tunnel
+ */
+struct tb_tunnel {
+	struct tb *tb;
+	struct tb_port *src_port;
+	struct tb_port *dst_port;
+	struct tb_path **paths;
+	size_t npaths;
+	int (*init)(struct tb_tunnel *tunnel);
+	int (*activate)(struct tb_tunnel *tunnel, bool activate);
+	struct list_head list;
+	enum tb_tunnel_type type;
+};
+
+struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
+struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
+				      struct tb_port *down);
+struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
+struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
+				     struct tb_port *out);
+struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
+				      struct tb_port *dst, int transmit_ring,
+				      int transmit_path, int receive_ring,
+				      int receive_path);
+
+void tb_tunnel_free(struct tb_tunnel *tunnel);
+int tb_tunnel_activate(struct tb_tunnel *tunnel);
+int tb_tunnel_restart(struct tb_tunnel *tunnel);
+void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
+bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
+
+static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
+{
+	return tunnel->type == TB_TUNNEL_PCI;
+}
+
+static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
+{
+	return tunnel->type == TB_TUNNEL_DP;
+}
+
+static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
+{
+	return tunnel->type == TB_TUNNEL_DMA;
+}
+
+#endif
+