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USB3 supports both isochronous and non-isochronous traffic. The former requires guaranteed bandwidth and can take up to 90% of the total bandwidth. With USB4 USB3 is tunneled over USB4 fabric which means that we need to make sure there is enough bandwidth allocated for the USB3 tunnels in addition to DisplayPort tunnels. Whereas DisplayPort bandwidth management is static and done before the DP tunnel is established, the USB3 bandwidth management is dynamic and allows increasing and decreasing the allocated bandwidth according to what is currently consumed. This is done through host router USB3 downstream adapter registers. This adds USB3 bandwidth management to the software connection manager so that we always try to allocate maximum bandwidth for DP tunnels and what is left is allocated for USB3. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Thunderbolt driver - Tunneling support
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2019, Intel Corporation
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*/
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#ifndef TB_TUNNEL_H_
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#define TB_TUNNEL_H_
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#include "tb.h"
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enum tb_tunnel_type {
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TB_TUNNEL_PCI,
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TB_TUNNEL_DP,
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TB_TUNNEL_DMA,
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TB_TUNNEL_USB3,
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};
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/**
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* struct tb_tunnel - Tunnel between two ports
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* @tb: Pointer to the domain
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* @src_port: Source port of the tunnel
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* @dst_port: Destination port of the tunnel. For discovered incomplete
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* tunnels may be %NULL or null adapter port instead.
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* @paths: All paths required by the tunnel
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* @npaths: Number of paths in @paths
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* @init: Optional tunnel specific initialization
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* @activate: Optional tunnel specific activation/deactivation
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* @consumed_bandwidth: Return how much bandwidth the tunnel consumes
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* @release_unused_bandwidth: Release all unused bandwidth
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* @reclaim_available_bandwidth: Reclaim back available bandwidth
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* @list: Tunnels are linked using this field
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* @type: Type of the tunnel
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* @max_up: Maximum upstream bandwidth (Mb/s) available for the tunnel.
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* Only set if the bandwidth needs to be limited.
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* @max_down: Maximum downstream bandwidth (Mb/s) available for the tunnel.
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* Only set if the bandwidth needs to be limited.
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* @allocated_up: Allocated upstream bandwidth (only for USB3)
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* @allocated_down: Allocated downstream bandwidth (only for USB3)
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*/
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struct tb_tunnel {
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struct tb *tb;
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struct tb_port *src_port;
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struct tb_port *dst_port;
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struct tb_path **paths;
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size_t npaths;
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int (*init)(struct tb_tunnel *tunnel);
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int (*activate)(struct tb_tunnel *tunnel, bool activate);
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int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up,
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int *consumed_down);
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int (*release_unused_bandwidth)(struct tb_tunnel *tunnel);
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void (*reclaim_available_bandwidth)(struct tb_tunnel *tunnel,
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int *available_up,
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int *available_down);
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struct list_head list;
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enum tb_tunnel_type type;
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int max_up;
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int max_down;
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int allocated_up;
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int allocated_down;
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};
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struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
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struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
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struct tb_port *down);
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struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
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struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
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struct tb_port *out, int max_up,
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int max_down);
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struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
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struct tb_port *dst, int transmit_ring,
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int transmit_path, int receive_ring,
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int receive_path);
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struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down);
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struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
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struct tb_port *down, int max_up,
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int max_down);
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void tb_tunnel_free(struct tb_tunnel *tunnel);
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int tb_tunnel_activate(struct tb_tunnel *tunnel);
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int tb_tunnel_restart(struct tb_tunnel *tunnel);
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void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
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bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
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bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
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const struct tb_port *port);
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int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
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int *consumed_down);
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int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel);
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void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
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int *available_up,
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int *available_down);
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static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_PCI;
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}
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static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_DP;
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}
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static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_DMA;
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}
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static inline bool tb_tunnel_is_usb3(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_USB3;
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}
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#endif
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