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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
14enum tb_tunnel_type {
15 TB_TUNNEL_PCI,
16 TB_TUNNEL_DP,
17 TB_TUNNEL_DMA,
18 TB_TUNNEL_USB3,
19};
20
21/**
22 * enum tb_tunnel_state - State of a tunnel
23 * @TB_TUNNEL_INACTIVE: tb_tunnel_activate() is not called for the tunnel
24 * @TB_TUNNEL_ACTIVATING: tb_tunnel_activate() returned successfully for the tunnel
25 * @TB_TUNNEL_ACTIVE: The tunnel is fully active
26 */
27enum tb_tunnel_state {
28 TB_TUNNEL_INACTIVE,
29 TB_TUNNEL_ACTIVATING,
30 TB_TUNNEL_ACTIVE,
31};
32
33/**
34 * struct tb_tunnel - Tunnel between two ports
35 * @kref: Reference count
36 * @tb: Pointer to the domain
37 * @src_port: Source port of the tunnel
38 * @dst_port: Destination port of the tunnel. For discovered incomplete
39 * tunnels may be %NULL or null adapter port instead.
40 * @paths: All paths required by the tunnel
41 * @npaths: Number of paths in @paths
42 * @pre_activate: Optional tunnel specific initialization called before
43 * activation. Can touch hardware.
44 * @activate: Optional tunnel specific activation/deactivation
45 * @post_deactivate: Optional tunnel specific de-initialization called
46 * after deactivation. Can touch hardware.
47 * @destroy: Optional tunnel specific callback called when the tunnel
48 * memory is being released. Should not touch hardware.
49 * @maximum_bandwidth: Returns maximum possible bandwidth for this tunnel
50 * @allocated_bandwidth: Return how much bandwidth is allocated for the tunnel
51 * @alloc_bandwidth: Change tunnel bandwidth allocation
52 * @consumed_bandwidth: Return how much bandwidth the tunnel consumes
53 * @release_unused_bandwidth: Release all unused bandwidth
54 * @reclaim_available_bandwidth: Reclaim back available bandwidth
55 * @list: Tunnels are linked using this field
56 * @type: Type of the tunnel
57 * @state: Current state of the tunnel
58 * @max_up: Maximum upstream bandwidth (Mb/s) available for the tunnel.
59 * Only set if the bandwidth needs to be limited.
60 * @max_down: Maximum downstream bandwidth (Mb/s) available for the tunnel.
61 * Only set if the bandwidth needs to be limited.
62 * @allocated_up: Allocated upstream bandwidth (only for USB3)
63 * @allocated_down: Allocated downstream bandwidth (only for USB3)
64 * @bw_mode: DP bandwidth allocation mode registers can be used to
65 * determine consumed and allocated bandwidth
66 * @dprx_started: DPRX negotiation was started (tb_dp_dprx_start() was called for it)
67 * @dprx_canceled: Was DPRX capabilities read poll canceled
68 * @dprx_timeout: If set DPRX capabilities read poll work will timeout after this passes
69 * @dprx_work: Worker that is scheduled to poll completion of DPRX capabilities read
70 * @callback: Optional callback called when DP tunnel is fully activated
71 * @callback_data: Optional data for @callback
72 */
73struct tb_tunnel {
74 struct kref kref;
75 struct tb *tb;
76 struct tb_port *src_port;
77 struct tb_port *dst_port;
78 struct tb_path **paths;
79 size_t npaths;
80 int (*pre_activate)(struct tb_tunnel *tunnel);
81 int (*activate)(struct tb_tunnel *tunnel, bool activate);
82 void (*post_deactivate)(struct tb_tunnel *tunnel);
83 void (*destroy)(struct tb_tunnel *tunnel);
84 int (*maximum_bandwidth)(struct tb_tunnel *tunnel, int *max_up,
85 int *max_down);
86 int (*allocated_bandwidth)(struct tb_tunnel *tunnel, int *allocated_up,
87 int *allocated_down);
88 int (*alloc_bandwidth)(struct tb_tunnel *tunnel, int *alloc_up,
89 int *alloc_down);
90 int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up,
91 int *consumed_down);
92 int (*release_unused_bandwidth)(struct tb_tunnel *tunnel);
93 void (*reclaim_available_bandwidth)(struct tb_tunnel *tunnel,
94 int *available_up,
95 int *available_down);
96 struct list_head list;
97 enum tb_tunnel_type type;
98 enum tb_tunnel_state state;
99 int max_up;
100 int max_down;
101 int allocated_up;
102 int allocated_down;
103 bool bw_mode;
104 bool dprx_started;
105 bool dprx_canceled;
106 ktime_t dprx_timeout;
107 struct delayed_work dprx_work;
108 void (*callback)(struct tb_tunnel *tunnel, void *data);
109 void *callback_data;
110};
111
112struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down,
113 bool alloc_hopid);
114struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
115 struct tb_port *down);
116bool tb_tunnel_reserved_pci(struct tb_port *port, int *reserved_up,
117 int *reserved_down);
118struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in,
119 bool alloc_hopid);
120struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
121 struct tb_port *out, int link_nr,
122 int max_up, int max_down,
123 void (*callback)(struct tb_tunnel *, void *),
124 void *callback_data);
125struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
126 struct tb_port *dst, int transmit_path,
127 int transmit_ring, int receive_path,
128 int receive_ring);
129bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,
130 int transmit_ring, int receive_path, int receive_ring);
131struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down,
132 bool alloc_hopid);
133struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
134 struct tb_port *down, int max_up,
135 int max_down);
136
137void tb_tunnel_put(struct tb_tunnel *tunnel);
138int tb_tunnel_activate(struct tb_tunnel *tunnel);
139void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
140
141/**
142 * tb_tunnel_is_active() - Is tunnel fully activated
143 * @tunnel: Tunnel to check
144 *
145 * Returns %true if @tunnel is fully activated. For other than DP
146 * tunnels this is pretty much once tb_tunnel_activate() returns
147 * successfully. However, for DP tunnels this returns %true only once the
148 * DPRX capabilities read has been issued successfully.
149 */
150static inline bool tb_tunnel_is_active(const struct tb_tunnel *tunnel)
151{
152 return tunnel->state == TB_TUNNEL_ACTIVE;
153}
154
155bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
156bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
157 const struct tb_port *port);
158int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
159 int *max_down);
160int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
161 int *allocated_down);
162int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
163 int *alloc_down);
164int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
165 int *consumed_down);
166int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel);
167void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
168 int *available_up,
169 int *available_down);
170
171static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
172{
173 return tunnel->type == TB_TUNNEL_PCI;
174}
175
176static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
177{
178 return tunnel->type == TB_TUNNEL_DP;
179}
180
181static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
182{
183 return tunnel->type == TB_TUNNEL_DMA;
184}
185
186static inline bool tb_tunnel_is_usb3(const struct tb_tunnel *tunnel)
187{
188 return tunnel->type == TB_TUNNEL_USB3;
189}
190
191static inline bool tb_tunnel_direction_downstream(const struct tb_tunnel *tunnel)
192{
193 return tb_port_path_direction_downstream(tunnel->src_port,
194 tunnel->dst_port);
195}
196
197const char *tb_tunnel_type_name(const struct tb_tunnel *tunnel);
198
199#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \
200 do { \
201 struct tb_tunnel *__tunnel = (tunnel); \
202 level(__tunnel->tb, "%llx:%u <-> %llx:%u (%s): " fmt, \
203 tb_route(__tunnel->src_port->sw), \
204 __tunnel->src_port->port, \
205 tb_route(__tunnel->dst_port->sw), \
206 __tunnel->dst_port->port, \
207 tb_tunnel_type_name(__tunnel), \
208 ## arg); \
209 } while (0)
210
211#define tb_tunnel_WARN(tunnel, fmt, arg...) \
212 __TB_TUNNEL_PRINT(tb_WARN, tunnel, fmt, ##arg)
213#define tb_tunnel_warn(tunnel, fmt, arg...) \
214 __TB_TUNNEL_PRINT(tb_warn, tunnel, fmt, ##arg)
215#define tb_tunnel_info(tunnel, fmt, arg...) \
216 __TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg)
217#define tb_tunnel_dbg(tunnel, fmt, arg...) \
218 __TB_TUNNEL_PRINT(tb_dbg, tunnel, fmt, ##arg)
219
220#endif