1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Thunderbolt driver - Tunneling support
4  *
5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6  * Copyright (C) 2019, Intel Corporation
7  */
8 
9 #ifndef TB_TUNNEL_H_
10 #define TB_TUNNEL_H_
11 
12 #include "tb.h"
13 
14 enum tb_tunnel_type {
15 	TB_TUNNEL_PCI,
16 	TB_TUNNEL_DP,
17 	TB_TUNNEL_DMA,
18 	TB_TUNNEL_USB3,
19 };
20 
21 /**
22  * struct tb_tunnel - Tunnel between two ports
23  * @tb: Pointer to the domain
24  * @src_port: Source port of the tunnel
25  * @dst_port: Destination port of the tunnel. For discovered incomplete
26  *	      tunnels may be %NULL or null adapter port instead.
27  * @paths: All paths required by the tunnel
28  * @npaths: Number of paths in @paths
29  * @init: Optional tunnel specific initialization
30  * @deinit: Optional tunnel specific de-initialization
31  * @activate: Optional tunnel specific activation/deactivation
32  * @maximum_bandwidth: Returns maximum possible bandwidth for this tunnel
33  * @allocated_bandwidth: Return how much bandwidth is allocated for the tunnel
34  * @alloc_bandwidth: Change tunnel bandwidth allocation
35  * @consumed_bandwidth: Return how much bandwidth the tunnel consumes
36  * @release_unused_bandwidth: Release all unused bandwidth
37  * @reclaim_available_bandwidth: Reclaim back available bandwidth
38  * @list: Tunnels are linked using this field
39  * @type: Type of the tunnel
40  * @max_up: Maximum upstream bandwidth (Mb/s) available for the tunnel.
41  *	    Only set if the bandwidth needs to be limited.
42  * @max_down: Maximum downstream bandwidth (Mb/s) available for the tunnel.
43  *	      Only set if the bandwidth needs to be limited.
44  * @allocated_up: Allocated upstream bandwidth (only for USB3)
45  * @allocated_down: Allocated downstream bandwidth (only for USB3)
46  * @bw_mode: DP bandwidth allocation mode registers can be used to
47  *	     determine consumed and allocated bandwidth
48  */
49 struct tb_tunnel {
50 	struct tb *tb;
51 	struct tb_port *src_port;
52 	struct tb_port *dst_port;
53 	struct tb_path **paths;
54 	size_t npaths;
55 	int (*init)(struct tb_tunnel *tunnel);
56 	void (*deinit)(struct tb_tunnel *tunnel);
57 	int (*activate)(struct tb_tunnel *tunnel, bool activate);
58 	int (*maximum_bandwidth)(struct tb_tunnel *tunnel, int *max_up,
59 				 int *max_down);
60 	int (*allocated_bandwidth)(struct tb_tunnel *tunnel, int *allocated_up,
61 				   int *allocated_down);
62 	int (*alloc_bandwidth)(struct tb_tunnel *tunnel, int *alloc_up,
63 			       int *alloc_down);
64 	int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up,
65 				  int *consumed_down);
66 	int (*release_unused_bandwidth)(struct tb_tunnel *tunnel);
67 	void (*reclaim_available_bandwidth)(struct tb_tunnel *tunnel,
68 					    int *available_up,
69 					    int *available_down);
70 	struct list_head list;
71 	enum tb_tunnel_type type;
72 	int max_up;
73 	int max_down;
74 	int allocated_up;
75 	int allocated_down;
76 	bool bw_mode;
77 };
78 
79 struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down,
80 					 bool alloc_hopid);
81 struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
82 				      struct tb_port *down);
83 struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in,
84 					bool alloc_hopid);
85 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
86 				     struct tb_port *out, int link_nr,
87 				     int max_up, int max_down);
88 struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
89 				      struct tb_port *dst, int transmit_path,
90 				      int transmit_ring, int receive_path,
91 				      int receive_ring);
92 bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,
93 			 int transmit_ring, int receive_path, int receive_ring);
94 struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down,
95 					  bool alloc_hopid);
96 struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
97 				       struct tb_port *down, int max_up,
98 				       int max_down);
99 
100 void tb_tunnel_free(struct tb_tunnel *tunnel);
101 int tb_tunnel_activate(struct tb_tunnel *tunnel);
102 int tb_tunnel_restart(struct tb_tunnel *tunnel);
103 void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
104 bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
105 bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
106 			    const struct tb_port *port);
107 int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
108 				int *max_down);
109 int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
110 				  int *allocated_down);
111 int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
112 			      int *alloc_down);
113 int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
114 				 int *consumed_down);
115 int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel);
116 void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
117 					   int *available_up,
118 					   int *available_down);
119 
tb_tunnel_is_pci(const struct tb_tunnel * tunnel)120 static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
121 {
122 	return tunnel->type == TB_TUNNEL_PCI;
123 }
124 
tb_tunnel_is_dp(const struct tb_tunnel * tunnel)125 static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
126 {
127 	return tunnel->type == TB_TUNNEL_DP;
128 }
129 
tb_tunnel_is_dma(const struct tb_tunnel * tunnel)130 static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
131 {
132 	return tunnel->type == TB_TUNNEL_DMA;
133 }
134 
tb_tunnel_is_usb3(const struct tb_tunnel * tunnel)135 static inline bool tb_tunnel_is_usb3(const struct tb_tunnel *tunnel)
136 {
137 	return tunnel->type == TB_TUNNEL_USB3;
138 }
139 
140 #endif
141 
142