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1781 lines
44 KiB
1781 lines
44 KiB
// 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 <[email protected]> |
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* Copyright (C) 2019, Intel Corporation |
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*/ |
|
|
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/list.h> |
|
|
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#include "tunnel.h" |
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#include "tb.h" |
|
|
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/* PCIe adapters use always HopID of 8 for both directions */ |
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#define TB_PCI_HOPID 8 |
|
|
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#define TB_PCI_PATH_DOWN 0 |
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#define TB_PCI_PATH_UP 1 |
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|
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/* USB3 adapters use always HopID of 8 for both directions */ |
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#define TB_USB3_HOPID 8 |
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|
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#define TB_USB3_PATH_DOWN 0 |
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#define TB_USB3_PATH_UP 1 |
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|
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/* DP adapters use HopID 8 for AUX and 9 for Video */ |
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#define TB_DP_AUX_TX_HOPID 8 |
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#define TB_DP_AUX_RX_HOPID 8 |
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#define TB_DP_VIDEO_HOPID 9 |
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|
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#define TB_DP_VIDEO_PATH_OUT 0 |
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#define TB_DP_AUX_PATH_OUT 1 |
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#define TB_DP_AUX_PATH_IN 2 |
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|
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/* Minimum number of credits needed for PCIe path */ |
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#define TB_MIN_PCIE_CREDITS 6U |
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/* |
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* Number of credits we try to allocate for each DMA path if not limited |
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* by the host router baMaxHI. |
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*/ |
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#define TB_DMA_CREDITS 14U |
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/* Minimum number of credits for DMA path */ |
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#define TB_MIN_DMA_CREDITS 1U |
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|
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static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" }; |
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|
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#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \ |
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do { \ |
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struct tb_tunnel *__tunnel = (tunnel); \ |
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level(__tunnel->tb, "%llx:%x <-> %llx:%x (%s): " fmt, \ |
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tb_route(__tunnel->src_port->sw), \ |
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__tunnel->src_port->port, \ |
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tb_route(__tunnel->dst_port->sw), \ |
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__tunnel->dst_port->port, \ |
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tb_tunnel_names[__tunnel->type], \ |
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## arg); \ |
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} while (0) |
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|
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#define tb_tunnel_WARN(tunnel, fmt, arg...) \ |
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__TB_TUNNEL_PRINT(tb_WARN, tunnel, fmt, ##arg) |
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#define tb_tunnel_warn(tunnel, fmt, arg...) \ |
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__TB_TUNNEL_PRINT(tb_warn, tunnel, fmt, ##arg) |
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#define tb_tunnel_info(tunnel, fmt, arg...) \ |
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__TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg) |
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#define tb_tunnel_dbg(tunnel, fmt, arg...) \ |
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__TB_TUNNEL_PRINT(tb_dbg, tunnel, fmt, ##arg) |
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|
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static inline unsigned int tb_usable_credits(const struct tb_port *port) |
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{ |
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return port->total_credits - port->ctl_credits; |
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} |
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|
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/** |
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* tb_available_credits() - Available credits for PCIe and DMA |
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* @port: Lane adapter to check |
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* @max_dp_streams: If non-%NULL stores maximum number of simultaneous DP |
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* streams possible through this lane adapter |
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*/ |
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static unsigned int tb_available_credits(const struct tb_port *port, |
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size_t *max_dp_streams) |
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{ |
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const struct tb_switch *sw = port->sw; |
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int credits, usb3, pcie, spare; |
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size_t ndp; |
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|
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usb3 = tb_acpi_may_tunnel_usb3() ? sw->max_usb3_credits : 0; |
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pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0; |
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|
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if (tb_acpi_is_xdomain_allowed()) { |
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spare = min_not_zero(sw->max_dma_credits, TB_DMA_CREDITS); |
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/* Add some credits for potential second DMA tunnel */ |
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spare += TB_MIN_DMA_CREDITS; |
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} else { |
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spare = 0; |
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} |
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|
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credits = tb_usable_credits(port); |
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if (tb_acpi_may_tunnel_dp()) { |
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/* |
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* Maximum number of DP streams possible through the |
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* lane adapter. |
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*/ |
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ndp = (credits - (usb3 + pcie + spare)) / |
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(sw->min_dp_aux_credits + sw->min_dp_main_credits); |
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} else { |
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ndp = 0; |
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} |
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credits -= ndp * (sw->min_dp_aux_credits + sw->min_dp_main_credits); |
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credits -= usb3; |
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|
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if (max_dp_streams) |
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*max_dp_streams = ndp; |
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|
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return credits > 0 ? credits : 0; |
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} |
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|
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static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths, |
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enum tb_tunnel_type type) |
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{ |
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struct tb_tunnel *tunnel; |
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|
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tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL); |
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if (!tunnel) |
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return NULL; |
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|
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tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL); |
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if (!tunnel->paths) { |
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tb_tunnel_free(tunnel); |
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return NULL; |
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} |
|
|
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INIT_LIST_HEAD(&tunnel->list); |
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tunnel->tb = tb; |
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tunnel->npaths = npaths; |
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tunnel->type = type; |
|
|
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return tunnel; |
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} |
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|
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static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate) |
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{ |
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int res; |
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|
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res = tb_pci_port_enable(tunnel->src_port, activate); |
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if (res) |
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return res; |
|
|
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if (tb_port_is_pcie_up(tunnel->dst_port)) |
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return tb_pci_port_enable(tunnel->dst_port, activate); |
|
|
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return 0; |
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} |
|
|
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static int tb_pci_init_credits(struct tb_path_hop *hop) |
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{ |
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struct tb_port *port = hop->in_port; |
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struct tb_switch *sw = port->sw; |
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unsigned int credits; |
|
|
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if (tb_port_use_credit_allocation(port)) { |
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unsigned int available; |
|
|
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available = tb_available_credits(port, NULL); |
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credits = min(sw->max_pcie_credits, available); |
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|
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if (credits < TB_MIN_PCIE_CREDITS) |
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return -ENOSPC; |
|
|
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credits = max(TB_MIN_PCIE_CREDITS, credits); |
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} else { |
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if (tb_port_is_null(port)) |
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credits = port->bonded ? 32 : 16; |
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else |
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credits = 7; |
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} |
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|
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hop->initial_credits = credits; |
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return 0; |
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} |
|
|
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static int tb_pci_init_path(struct tb_path *path) |
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{ |
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struct tb_path_hop *hop; |
|
|
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path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
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path->egress_shared_buffer = TB_PATH_NONE; |
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path->ingress_fc_enable = TB_PATH_ALL; |
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path->ingress_shared_buffer = TB_PATH_NONE; |
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path->priority = 3; |
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path->weight = 1; |
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path->drop_packages = 0; |
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|
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tb_path_for_each_hop(path, hop) { |
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int ret; |
|
|
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ret = tb_pci_init_credits(hop); |
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if (ret) |
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return ret; |
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} |
|
|
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return 0; |
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} |
|
|
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/** |
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* tb_tunnel_discover_pci() - Discover existing PCIe tunnels |
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* @tb: Pointer to the domain structure |
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* @down: PCIe downstream adapter |
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* |
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* If @down adapter is active, follows the tunnel to the PCIe upstream |
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* adapter and back. Returns the discovered tunnel or %NULL if there was |
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* no tunnel. |
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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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{ |
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struct tb_tunnel *tunnel; |
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struct tb_path *path; |
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|
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if (!tb_pci_port_is_enabled(down)) |
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return NULL; |
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|
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tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); |
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if (!tunnel) |
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return NULL; |
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|
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tunnel->activate = tb_pci_activate; |
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tunnel->src_port = down; |
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|
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/* |
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* Discover both paths even if they are not complete. We will |
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* clean them up by calling tb_tunnel_deactivate() below in that |
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* case. |
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*/ |
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path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1, |
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&tunnel->dst_port, "PCIe Up"); |
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if (!path) { |
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/* Just disable the downstream port */ |
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tb_pci_port_enable(down, false); |
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goto err_free; |
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} |
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tunnel->paths[TB_PCI_PATH_UP] = path; |
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if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP])) |
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goto err_free; |
|
|
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path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL, |
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"PCIe Down"); |
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if (!path) |
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goto err_deactivate; |
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tunnel->paths[TB_PCI_PATH_DOWN] = path; |
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if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN])) |
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goto err_deactivate; |
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|
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/* Validate that the tunnel is complete */ |
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if (!tb_port_is_pcie_up(tunnel->dst_port)) { |
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tb_port_warn(tunnel->dst_port, |
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"path does not end on a PCIe adapter, cleaning up\n"); |
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goto err_deactivate; |
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} |
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|
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if (down != tunnel->src_port) { |
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tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); |
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goto err_deactivate; |
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} |
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if (!tb_pci_port_is_enabled(tunnel->dst_port)) { |
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tb_tunnel_warn(tunnel, |
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"tunnel is not fully activated, cleaning up\n"); |
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goto err_deactivate; |
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} |
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tb_tunnel_dbg(tunnel, "discovered\n"); |
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return tunnel; |
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|
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err_deactivate: |
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tb_tunnel_deactivate(tunnel); |
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err_free: |
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tb_tunnel_free(tunnel); |
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|
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return NULL; |
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} |
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|
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/** |
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* tb_tunnel_alloc_pci() - allocate a pci tunnel |
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* @tb: Pointer to the domain structure |
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* @up: PCIe upstream adapter port |
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* @down: PCIe downstream adapter port |
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* |
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* Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and |
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* TB_TYPE_PCIE_DOWN. |
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* |
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* Return: Returns a tb_tunnel on success or NULL on failure. |
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*/ |
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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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{ |
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struct tb_tunnel *tunnel; |
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struct tb_path *path; |
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|
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tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); |
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if (!tunnel) |
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return NULL; |
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tunnel->activate = tb_pci_activate; |
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tunnel->src_port = down; |
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tunnel->dst_port = up; |
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|
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path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0, |
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"PCIe Down"); |
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if (!path) |
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goto err_free; |
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tunnel->paths[TB_PCI_PATH_DOWN] = path; |
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if (tb_pci_init_path(path)) |
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goto err_free; |
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|
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path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0, |
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"PCIe Up"); |
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if (!path) |
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goto err_free; |
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tunnel->paths[TB_PCI_PATH_UP] = path; |
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if (tb_pci_init_path(path)) |
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goto err_free; |
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|
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return tunnel; |
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|
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err_free: |
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tb_tunnel_free(tunnel); |
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return NULL; |
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} |
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static bool tb_dp_is_usb4(const struct tb_switch *sw) |
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{ |
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/* Titan Ridge DP adapters need the same treatment as USB4 */ |
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return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw); |
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} |
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|
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static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out) |
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{ |
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int timeout = 10; |
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u32 val; |
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int ret; |
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|
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/* Both ends need to support this */ |
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if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw)) |
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return 0; |
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|
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ret = tb_port_read(out, &val, TB_CFG_PORT, |
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out->cap_adap + DP_STATUS_CTRL, 1); |
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if (ret) |
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return ret; |
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|
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val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS; |
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|
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ret = tb_port_write(out, &val, TB_CFG_PORT, |
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out->cap_adap + DP_STATUS_CTRL, 1); |
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if (ret) |
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return ret; |
|
|
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do { |
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ret = tb_port_read(out, &val, TB_CFG_PORT, |
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out->cap_adap + DP_STATUS_CTRL, 1); |
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if (ret) |
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return ret; |
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if (!(val & DP_STATUS_CTRL_CMHS)) |
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return 0; |
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usleep_range(10, 100); |
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} while (timeout--); |
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|
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return -ETIMEDOUT; |
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} |
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|
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static inline u32 tb_dp_cap_get_rate(u32 val) |
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{ |
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u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT; |
|
|
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switch (rate) { |
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case DP_COMMON_CAP_RATE_RBR: |
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return 1620; |
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case DP_COMMON_CAP_RATE_HBR: |
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return 2700; |
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case DP_COMMON_CAP_RATE_HBR2: |
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return 5400; |
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case DP_COMMON_CAP_RATE_HBR3: |
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return 8100; |
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default: |
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return 0; |
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} |
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} |
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|
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static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate) |
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{ |
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val &= ~DP_COMMON_CAP_RATE_MASK; |
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switch (rate) { |
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default: |
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WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate); |
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fallthrough; |
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case 1620: |
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val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT; |
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break; |
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case 2700: |
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val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT; |
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break; |
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case 5400: |
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val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT; |
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break; |
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case 8100: |
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val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT; |
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break; |
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} |
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return val; |
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} |
|
|
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static inline u32 tb_dp_cap_get_lanes(u32 val) |
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{ |
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u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT; |
|
|
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switch (lanes) { |
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case DP_COMMON_CAP_1_LANE: |
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return 1; |
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case DP_COMMON_CAP_2_LANES: |
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return 2; |
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case DP_COMMON_CAP_4_LANES: |
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return 4; |
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default: |
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return 0; |
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} |
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} |
|
|
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static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes) |
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{ |
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val &= ~DP_COMMON_CAP_LANES_MASK; |
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switch (lanes) { |
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default: |
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WARN(1, "invalid number of lanes %u passed, defaulting to 1\n", |
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lanes); |
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fallthrough; |
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case 1: |
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val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT; |
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break; |
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case 2: |
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val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT; |
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break; |
|
case 4: |
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val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT; |
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break; |
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} |
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return val; |
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} |
|
|
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static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes) |
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{ |
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/* Tunneling removes the DP 8b/10b encoding */ |
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return rate * lanes * 8 / 10; |
|
} |
|
|
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static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes, |
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u32 out_rate, u32 out_lanes, u32 *new_rate, |
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u32 *new_lanes) |
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{ |
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static const u32 dp_bw[][2] = { |
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/* Mb/s, lanes */ |
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{ 8100, 4 }, /* 25920 Mb/s */ |
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{ 5400, 4 }, /* 17280 Mb/s */ |
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{ 8100, 2 }, /* 12960 Mb/s */ |
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{ 2700, 4 }, /* 8640 Mb/s */ |
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{ 5400, 2 }, /* 8640 Mb/s */ |
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{ 8100, 1 }, /* 6480 Mb/s */ |
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{ 1620, 4 }, /* 5184 Mb/s */ |
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{ 5400, 1 }, /* 4320 Mb/s */ |
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{ 2700, 2 }, /* 4320 Mb/s */ |
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{ 1620, 2 }, /* 2592 Mb/s */ |
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{ 2700, 1 }, /* 2160 Mb/s */ |
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{ 1620, 1 }, /* 1296 Mb/s */ |
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}; |
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unsigned int i; |
|
|
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/* |
|
* Find a combination that can fit into max_bw and does not |
|
* exceed the maximum rate and lanes supported by the DP OUT and |
|
* DP IN adapters. |
|
*/ |
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for (i = 0; i < ARRAY_SIZE(dp_bw); i++) { |
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if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes) |
|
continue; |
|
|
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if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes) |
|
continue; |
|
|
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if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) { |
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*new_rate = dp_bw[i][0]; |
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*new_lanes = dp_bw[i][1]; |
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return 0; |
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} |
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} |
|
|
|
return -ENOSR; |
|
} |
|
|
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static int tb_dp_xchg_caps(struct tb_tunnel *tunnel) |
|
{ |
|
u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw; |
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struct tb_port *out = tunnel->dst_port; |
|
struct tb_port *in = tunnel->src_port; |
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int ret, max_bw; |
|
|
|
/* |
|
* Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for |
|
* newer generation hardware. |
|
*/ |
|
if (in->sw->generation < 2 || out->sw->generation < 2) |
|
return 0; |
|
|
|
/* |
|
* Perform connection manager handshake between IN and OUT ports |
|
* before capabilities exchange can take place. |
|
*/ |
|
ret = tb_dp_cm_handshake(in, out); |
|
if (ret) |
|
return ret; |
|
|
|
/* Read both DP_LOCAL_CAP registers */ |
|
ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT, |
|
in->cap_adap + DP_LOCAL_CAP, 1); |
|
if (ret) |
|
return ret; |
|
|
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ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT, |
|
out->cap_adap + DP_LOCAL_CAP, 1); |
|
if (ret) |
|
return ret; |
|
|
|
/* Write IN local caps to OUT remote caps */ |
|
ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT, |
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out->cap_adap + DP_REMOTE_CAP, 1); |
|
if (ret) |
|
return ret; |
|
|
|
in_rate = tb_dp_cap_get_rate(in_dp_cap); |
|
in_lanes = tb_dp_cap_get_lanes(in_dp_cap); |
|
tb_port_dbg(in, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", |
|
in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes)); |
|
|
|
/* |
|
* If the tunnel bandwidth is limited (max_bw is set) then see |
|
* if we need to reduce bandwidth to fit there. |
|
*/ |
|
out_rate = tb_dp_cap_get_rate(out_dp_cap); |
|
out_lanes = tb_dp_cap_get_lanes(out_dp_cap); |
|
bw = tb_dp_bandwidth(out_rate, out_lanes); |
|
tb_port_dbg(out, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", |
|
out_rate, out_lanes, bw); |
|
|
|
if (in->sw->config.depth < out->sw->config.depth) |
|
max_bw = tunnel->max_down; |
|
else |
|
max_bw = tunnel->max_up; |
|
|
|
if (max_bw && bw > max_bw) { |
|
u32 new_rate, new_lanes, new_bw; |
|
|
|
ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes, |
|
out_rate, out_lanes, &new_rate, |
|
&new_lanes); |
|
if (ret) { |
|
tb_port_info(out, "not enough bandwidth for DP tunnel\n"); |
|
return ret; |
|
} |
|
|
|
new_bw = tb_dp_bandwidth(new_rate, new_lanes); |
|
tb_port_dbg(out, "bandwidth reduced to %u Mb/s x%u = %u Mb/s\n", |
|
new_rate, new_lanes, new_bw); |
|
|
|
/* |
|
* Set new rate and number of lanes before writing it to |
|
* the IN port remote caps. |
|
*/ |
|
out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate); |
|
out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes); |
|
} |
|
|
|
return tb_port_write(in, &out_dp_cap, TB_CFG_PORT, |
|
in->cap_adap + DP_REMOTE_CAP, 1); |
|
} |
|
|
|
static int tb_dp_activate(struct tb_tunnel *tunnel, bool active) |
|
{ |
|
int ret; |
|
|
|
if (active) { |
|
struct tb_path **paths; |
|
int last; |
|
|
|
paths = tunnel->paths; |
|
last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1; |
|
|
|
tb_dp_port_set_hops(tunnel->src_port, |
|
paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index, |
|
paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index, |
|
paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index); |
|
|
|
tb_dp_port_set_hops(tunnel->dst_port, |
|
paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index, |
|
paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index, |
|
paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index); |
|
} else { |
|
tb_dp_port_hpd_clear(tunnel->src_port); |
|
tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0); |
|
if (tb_port_is_dpout(tunnel->dst_port)) |
|
tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0); |
|
} |
|
|
|
ret = tb_dp_port_enable(tunnel->src_port, active); |
|
if (ret) |
|
return ret; |
|
|
|
if (tb_port_is_dpout(tunnel->dst_port)) |
|
return tb_dp_port_enable(tunnel->dst_port, active); |
|
|
|
return 0; |
|
} |
|
|
|
static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, |
|
int *consumed_down) |
|
{ |
|
struct tb_port *in = tunnel->src_port; |
|
const struct tb_switch *sw = in->sw; |
|
u32 val, rate = 0, lanes = 0; |
|
int ret; |
|
|
|
if (tb_dp_is_usb4(sw)) { |
|
int timeout = 20; |
|
|
|
/* |
|
* Wait for DPRX done. Normally it should be already set |
|
* for active tunnel. |
|
*/ |
|
do { |
|
ret = tb_port_read(in, &val, TB_CFG_PORT, |
|
in->cap_adap + DP_COMMON_CAP, 1); |
|
if (ret) |
|
return ret; |
|
|
|
if (val & DP_COMMON_CAP_DPRX_DONE) { |
|
rate = tb_dp_cap_get_rate(val); |
|
lanes = tb_dp_cap_get_lanes(val); |
|
break; |
|
} |
|
msleep(250); |
|
} while (timeout--); |
|
|
|
if (!timeout) |
|
return -ETIMEDOUT; |
|
} else if (sw->generation >= 2) { |
|
/* |
|
* Read from the copied remote cap so that we take into |
|
* account if capabilities were reduced during exchange. |
|
*/ |
|
ret = tb_port_read(in, &val, TB_CFG_PORT, |
|
in->cap_adap + DP_REMOTE_CAP, 1); |
|
if (ret) |
|
return ret; |
|
|
|
rate = tb_dp_cap_get_rate(val); |
|
lanes = tb_dp_cap_get_lanes(val); |
|
} else { |
|
/* No bandwidth management for legacy devices */ |
|
*consumed_up = 0; |
|
*consumed_down = 0; |
|
return 0; |
|
} |
|
|
|
if (in->sw->config.depth < tunnel->dst_port->sw->config.depth) { |
|
*consumed_up = 0; |
|
*consumed_down = tb_dp_bandwidth(rate, lanes); |
|
} else { |
|
*consumed_up = tb_dp_bandwidth(rate, lanes); |
|
*consumed_down = 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void tb_dp_init_aux_credits(struct tb_path_hop *hop) |
|
{ |
|
struct tb_port *port = hop->in_port; |
|
struct tb_switch *sw = port->sw; |
|
|
|
if (tb_port_use_credit_allocation(port)) |
|
hop->initial_credits = sw->min_dp_aux_credits; |
|
else |
|
hop->initial_credits = 1; |
|
} |
|
|
|
static void tb_dp_init_aux_path(struct tb_path *path) |
|
{ |
|
struct tb_path_hop *hop; |
|
|
|
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
|
path->egress_shared_buffer = TB_PATH_NONE; |
|
path->ingress_fc_enable = TB_PATH_ALL; |
|
path->ingress_shared_buffer = TB_PATH_NONE; |
|
path->priority = 2; |
|
path->weight = 1; |
|
|
|
tb_path_for_each_hop(path, hop) |
|
tb_dp_init_aux_credits(hop); |
|
} |
|
|
|
static int tb_dp_init_video_credits(struct tb_path_hop *hop) |
|
{ |
|
struct tb_port *port = hop->in_port; |
|
struct tb_switch *sw = port->sw; |
|
|
|
if (tb_port_use_credit_allocation(port)) { |
|
unsigned int nfc_credits; |
|
size_t max_dp_streams; |
|
|
|
tb_available_credits(port, &max_dp_streams); |
|
/* |
|
* Read the number of currently allocated NFC credits |
|
* from the lane adapter. Since we only use them for DP |
|
* tunneling we can use that to figure out how many DP |
|
* tunnels already go through the lane adapter. |
|
*/ |
|
nfc_credits = port->config.nfc_credits & |
|
ADP_CS_4_NFC_BUFFERS_MASK; |
|
if (nfc_credits / sw->min_dp_main_credits > max_dp_streams) |
|
return -ENOSPC; |
|
|
|
hop->nfc_credits = sw->min_dp_main_credits; |
|
} else { |
|
hop->nfc_credits = min(port->total_credits - 2, 12U); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int tb_dp_init_video_path(struct tb_path *path) |
|
{ |
|
struct tb_path_hop *hop; |
|
|
|
path->egress_fc_enable = TB_PATH_NONE; |
|
path->egress_shared_buffer = TB_PATH_NONE; |
|
path->ingress_fc_enable = TB_PATH_NONE; |
|
path->ingress_shared_buffer = TB_PATH_NONE; |
|
path->priority = 1; |
|
path->weight = 1; |
|
|
|
tb_path_for_each_hop(path, hop) { |
|
int ret; |
|
|
|
ret = tb_dp_init_video_credits(hop); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* tb_tunnel_discover_dp() - Discover existing Display Port tunnels |
|
* @tb: Pointer to the domain structure |
|
* @in: DP in adapter |
|
* |
|
* If @in adapter is active, follows the tunnel to the DP out adapter |
|
* and back. Returns the discovered tunnel or %NULL if there was no |
|
* tunnel. |
|
* |
|
* Return: DP tunnel or %NULL if no tunnel found. |
|
*/ |
|
struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in) |
|
{ |
|
struct tb_tunnel *tunnel; |
|
struct tb_port *port; |
|
struct tb_path *path; |
|
|
|
if (!tb_dp_port_is_enabled(in)) |
|
return NULL; |
|
|
|
tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); |
|
if (!tunnel) |
|
return NULL; |
|
|
|
tunnel->init = tb_dp_xchg_caps; |
|
tunnel->activate = tb_dp_activate; |
|
tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; |
|
tunnel->src_port = in; |
|
|
|
path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1, |
|
&tunnel->dst_port, "Video"); |
|
if (!path) { |
|
/* Just disable the DP IN port */ |
|
tb_dp_port_enable(in, false); |
|
goto err_free; |
|
} |
|
tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path; |
|
if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT])) |
|
goto err_free; |
|
|
|
path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX"); |
|
if (!path) |
|
goto err_deactivate; |
|
tunnel->paths[TB_DP_AUX_PATH_OUT] = path; |
|
tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT]); |
|
|
|
path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID, |
|
&port, "AUX RX"); |
|
if (!path) |
|
goto err_deactivate; |
|
tunnel->paths[TB_DP_AUX_PATH_IN] = path; |
|
tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN]); |
|
|
|
/* Validate that the tunnel is complete */ |
|
if (!tb_port_is_dpout(tunnel->dst_port)) { |
|
tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n"); |
|
goto err_deactivate; |
|
} |
|
|
|
if (!tb_dp_port_is_enabled(tunnel->dst_port)) |
|
goto err_deactivate; |
|
|
|
if (!tb_dp_port_hpd_is_active(tunnel->dst_port)) |
|
goto err_deactivate; |
|
|
|
if (port != tunnel->src_port) { |
|
tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); |
|
goto err_deactivate; |
|
} |
|
|
|
tb_tunnel_dbg(tunnel, "discovered\n"); |
|
return tunnel; |
|
|
|
err_deactivate: |
|
tb_tunnel_deactivate(tunnel); |
|
err_free: |
|
tb_tunnel_free(tunnel); |
|
|
|
return NULL; |
|
} |
|
|
|
/** |
|
* tb_tunnel_alloc_dp() - allocate a Display Port tunnel |
|
* @tb: Pointer to the domain structure |
|
* @in: DP in adapter port |
|
* @out: DP out adapter port |
|
* @max_up: Maximum available upstream bandwidth for the DP tunnel (%0 |
|
* if not limited) |
|
* @max_down: Maximum available downstream bandwidth for the DP tunnel |
|
* (%0 if not limited) |
|
* |
|
* Allocates a tunnel between @in and @out that is capable of tunneling |
|
* Display Port traffic. |
|
* |
|
* Return: Returns a tb_tunnel on success or NULL on failure. |
|
*/ |
|
struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in, |
|
struct tb_port *out, int max_up, |
|
int max_down) |
|
{ |
|
struct tb_tunnel *tunnel; |
|
struct tb_path **paths; |
|
struct tb_path *path; |
|
|
|
if (WARN_ON(!in->cap_adap || !out->cap_adap)) |
|
return NULL; |
|
|
|
tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); |
|
if (!tunnel) |
|
return NULL; |
|
|
|
tunnel->init = tb_dp_xchg_caps; |
|
tunnel->activate = tb_dp_activate; |
|
tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; |
|
tunnel->src_port = in; |
|
tunnel->dst_port = out; |
|
tunnel->max_up = max_up; |
|
tunnel->max_down = max_down; |
|
|
|
paths = tunnel->paths; |
|
|
|
path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID, |
|
1, "Video"); |
|
if (!path) |
|
goto err_free; |
|
tb_dp_init_video_path(path); |
|
paths[TB_DP_VIDEO_PATH_OUT] = path; |
|
|
|
path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out, |
|
TB_DP_AUX_TX_HOPID, 1, "AUX TX"); |
|
if (!path) |
|
goto err_free; |
|
tb_dp_init_aux_path(path); |
|
paths[TB_DP_AUX_PATH_OUT] = path; |
|
|
|
path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in, |
|
TB_DP_AUX_RX_HOPID, 1, "AUX RX"); |
|
if (!path) |
|
goto err_free; |
|
tb_dp_init_aux_path(path); |
|
paths[TB_DP_AUX_PATH_IN] = path; |
|
|
|
return tunnel; |
|
|
|
err_free: |
|
tb_tunnel_free(tunnel); |
|
return NULL; |
|
} |
|
|
|
static unsigned int tb_dma_available_credits(const struct tb_port *port) |
|
{ |
|
const struct tb_switch *sw = port->sw; |
|
int credits; |
|
|
|
credits = tb_available_credits(port, NULL); |
|
if (tb_acpi_may_tunnel_pcie()) |
|
credits -= sw->max_pcie_credits; |
|
credits -= port->dma_credits; |
|
|
|
return credits > 0 ? credits : 0; |
|
} |
|
|
|
static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits) |
|
{ |
|
struct tb_port *port = hop->in_port; |
|
|
|
if (tb_port_use_credit_allocation(port)) { |
|
unsigned int available = tb_dma_available_credits(port); |
|
|
|
/* |
|
* Need to have at least TB_MIN_DMA_CREDITS, otherwise |
|
* DMA path cannot be established. |
|
*/ |
|
if (available < TB_MIN_DMA_CREDITS) |
|
return -ENOSPC; |
|
|
|
while (credits > available) |
|
credits--; |
|
|
|
tb_port_dbg(port, "reserving %u credits for DMA path\n", |
|
credits); |
|
|
|
port->dma_credits += credits; |
|
} else { |
|
if (tb_port_is_null(port)) |
|
credits = port->bonded ? 14 : 6; |
|
else |
|
credits = min(port->total_credits, credits); |
|
} |
|
|
|
hop->initial_credits = credits; |
|
return 0; |
|
} |
|
|
|
/* Path from lane adapter to NHI */ |
|
static int tb_dma_init_rx_path(struct tb_path *path, unsigned int credits) |
|
{ |
|
struct tb_path_hop *hop; |
|
unsigned int i, tmp; |
|
|
|
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
|
path->ingress_fc_enable = TB_PATH_ALL; |
|
path->egress_shared_buffer = TB_PATH_NONE; |
|
path->ingress_shared_buffer = TB_PATH_NONE; |
|
path->priority = 5; |
|
path->weight = 1; |
|
path->clear_fc = true; |
|
|
|
/* |
|
* First lane adapter is the one connected to the remote host. |
|
* We don't tunnel other traffic over this link so can use all |
|
* the credits (except the ones reserved for control traffic). |
|
*/ |
|
hop = &path->hops[0]; |
|
tmp = min(tb_usable_credits(hop->in_port), credits); |
|
hop->initial_credits = tmp; |
|
hop->in_port->dma_credits += tmp; |
|
|
|
for (i = 1; i < path->path_length; i++) { |
|
int ret; |
|
|
|
ret = tb_dma_reserve_credits(&path->hops[i], credits); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* Path from NHI to lane adapter */ |
|
static int tb_dma_init_tx_path(struct tb_path *path, unsigned int credits) |
|
{ |
|
struct tb_path_hop *hop; |
|
|
|
path->egress_fc_enable = TB_PATH_ALL; |
|
path->ingress_fc_enable = TB_PATH_ALL; |
|
path->egress_shared_buffer = TB_PATH_NONE; |
|
path->ingress_shared_buffer = TB_PATH_NONE; |
|
path->priority = 5; |
|
path->weight = 1; |
|
path->clear_fc = true; |
|
|
|
tb_path_for_each_hop(path, hop) { |
|
int ret; |
|
|
|
ret = tb_dma_reserve_credits(hop, credits); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void tb_dma_release_credits(struct tb_path_hop *hop) |
|
{ |
|
struct tb_port *port = hop->in_port; |
|
|
|
if (tb_port_use_credit_allocation(port)) { |
|
port->dma_credits -= hop->initial_credits; |
|
|
|
tb_port_dbg(port, "released %u DMA path credits\n", |
|
hop->initial_credits); |
|
} |
|
} |
|
|
|
static void tb_dma_deinit_path(struct tb_path *path) |
|
{ |
|
struct tb_path_hop *hop; |
|
|
|
tb_path_for_each_hop(path, hop) |
|
tb_dma_release_credits(hop); |
|
} |
|
|
|
static void tb_dma_deinit(struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (!tunnel->paths[i]) |
|
continue; |
|
tb_dma_deinit_path(tunnel->paths[i]); |
|
} |
|
} |
|
|
|
/** |
|
* tb_tunnel_alloc_dma() - allocate a DMA tunnel |
|
* @tb: Pointer to the domain structure |
|
* @nhi: Host controller port |
|
* @dst: Destination null port which the other domain is connected to |
|
* @transmit_path: HopID used for transmitting packets |
|
* @transmit_ring: NHI ring number used to send packets towards the |
|
* other domain. Set to %-1 if TX path is not needed. |
|
* @receive_path: HopID used for receiving packets |
|
* @receive_ring: NHI ring number used to receive packets from the |
|
* other domain. Set to %-1 if RX path is not needed. |
|
* |
|
* Return: Returns a tb_tunnel on success or NULL on failure. |
|
*/ |
|
struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi, |
|
struct tb_port *dst, int transmit_path, |
|
int transmit_ring, int receive_path, |
|
int receive_ring) |
|
{ |
|
struct tb_tunnel *tunnel; |
|
size_t npaths = 0, i = 0; |
|
struct tb_path *path; |
|
int credits; |
|
|
|
if (receive_ring > 0) |
|
npaths++; |
|
if (transmit_ring > 0) |
|
npaths++; |
|
|
|
if (WARN_ON(!npaths)) |
|
return NULL; |
|
|
|
tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA); |
|
if (!tunnel) |
|
return NULL; |
|
|
|
tunnel->src_port = nhi; |
|
tunnel->dst_port = dst; |
|
tunnel->deinit = tb_dma_deinit; |
|
|
|
credits = min_not_zero(TB_DMA_CREDITS, nhi->sw->max_dma_credits); |
|
|
|
if (receive_ring > 0) { |
|
path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0, |
|
"DMA RX"); |
|
if (!path) |
|
goto err_free; |
|
tunnel->paths[i++] = path; |
|
if (tb_dma_init_rx_path(path, credits)) { |
|
tb_tunnel_dbg(tunnel, "not enough buffers for RX path\n"); |
|
goto err_free; |
|
} |
|
} |
|
|
|
if (transmit_ring > 0) { |
|
path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0, |
|
"DMA TX"); |
|
if (!path) |
|
goto err_free; |
|
tunnel->paths[i++] = path; |
|
if (tb_dma_init_tx_path(path, credits)) { |
|
tb_tunnel_dbg(tunnel, "not enough buffers for TX path\n"); |
|
goto err_free; |
|
} |
|
} |
|
|
|
return tunnel; |
|
|
|
err_free: |
|
tb_tunnel_free(tunnel); |
|
return NULL; |
|
} |
|
|
|
/** |
|
* tb_tunnel_match_dma() - Match DMA tunnel |
|
* @tunnel: Tunnel to match |
|
* @transmit_path: HopID used for transmitting packets. Pass %-1 to ignore. |
|
* @transmit_ring: NHI ring number used to send packets towards the |
|
* other domain. Pass %-1 to ignore. |
|
* @receive_path: HopID used for receiving packets. Pass %-1 to ignore. |
|
* @receive_ring: NHI ring number used to receive packets from the |
|
* other domain. Pass %-1 to ignore. |
|
* |
|
* This function can be used to match specific DMA tunnel, if there are |
|
* multiple DMA tunnels going through the same XDomain connection. |
|
* Returns true if there is match and false otherwise. |
|
*/ |
|
bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path, |
|
int transmit_ring, int receive_path, int receive_ring) |
|
{ |
|
const struct tb_path *tx_path = NULL, *rx_path = NULL; |
|
int i; |
|
|
|
if (!receive_ring || !transmit_ring) |
|
return false; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
const struct tb_path *path = tunnel->paths[i]; |
|
|
|
if (!path) |
|
continue; |
|
|
|
if (tb_port_is_nhi(path->hops[0].in_port)) |
|
tx_path = path; |
|
else if (tb_port_is_nhi(path->hops[path->path_length - 1].out_port)) |
|
rx_path = path; |
|
} |
|
|
|
if (transmit_ring > 0 || transmit_path > 0) { |
|
if (!tx_path) |
|
return false; |
|
if (transmit_ring > 0 && |
|
(tx_path->hops[0].in_hop_index != transmit_ring)) |
|
return false; |
|
if (transmit_path > 0 && |
|
(tx_path->hops[tx_path->path_length - 1].next_hop_index != transmit_path)) |
|
return false; |
|
} |
|
|
|
if (receive_ring > 0 || receive_path > 0) { |
|
if (!rx_path) |
|
return false; |
|
if (receive_path > 0 && |
|
(rx_path->hops[0].in_hop_index != receive_path)) |
|
return false; |
|
if (receive_ring > 0 && |
|
(rx_path->hops[rx_path->path_length - 1].next_hop_index != receive_ring)) |
|
return false; |
|
} |
|
|
|
return true; |
|
} |
|
|
|
static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down) |
|
{ |
|
int ret, up_max_rate, down_max_rate; |
|
|
|
ret = usb4_usb3_port_max_link_rate(up); |
|
if (ret < 0) |
|
return ret; |
|
up_max_rate = ret; |
|
|
|
ret = usb4_usb3_port_max_link_rate(down); |
|
if (ret < 0) |
|
return ret; |
|
down_max_rate = ret; |
|
|
|
return min(up_max_rate, down_max_rate); |
|
} |
|
|
|
static int tb_usb3_init(struct tb_tunnel *tunnel) |
|
{ |
|
tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n", |
|
tunnel->allocated_up, tunnel->allocated_down); |
|
|
|
return usb4_usb3_port_allocate_bandwidth(tunnel->src_port, |
|
&tunnel->allocated_up, |
|
&tunnel->allocated_down); |
|
} |
|
|
|
static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate) |
|
{ |
|
int res; |
|
|
|
res = tb_usb3_port_enable(tunnel->src_port, activate); |
|
if (res) |
|
return res; |
|
|
|
if (tb_port_is_usb3_up(tunnel->dst_port)) |
|
return tb_usb3_port_enable(tunnel->dst_port, activate); |
|
|
|
return 0; |
|
} |
|
|
|
static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel, |
|
int *consumed_up, int *consumed_down) |
|
{ |
|
int pcie_enabled = tb_acpi_may_tunnel_pcie(); |
|
|
|
/* |
|
* PCIe tunneling, if enabled, affects the USB3 bandwidth so |
|
* take that it into account here. |
|
*/ |
|
*consumed_up = tunnel->allocated_up * (3 + pcie_enabled) / 3; |
|
*consumed_down = tunnel->allocated_down * (3 + pcie_enabled) / 3; |
|
return 0; |
|
} |
|
|
|
static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel) |
|
{ |
|
int ret; |
|
|
|
ret = usb4_usb3_port_release_bandwidth(tunnel->src_port, |
|
&tunnel->allocated_up, |
|
&tunnel->allocated_down); |
|
if (ret) |
|
return ret; |
|
|
|
tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n", |
|
tunnel->allocated_up, tunnel->allocated_down); |
|
return 0; |
|
} |
|
|
|
static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel, |
|
int *available_up, |
|
int *available_down) |
|
{ |
|
int ret, max_rate, allocate_up, allocate_down; |
|
|
|
ret = usb4_usb3_port_actual_link_rate(tunnel->src_port); |
|
if (ret < 0) { |
|
tb_tunnel_warn(tunnel, "failed to read actual link rate\n"); |
|
return; |
|
} else if (!ret) { |
|
/* Use maximum link rate if the link valid is not set */ |
|
ret = usb4_usb3_port_max_link_rate(tunnel->src_port); |
|
if (ret < 0) { |
|
tb_tunnel_warn(tunnel, "failed to read maximum link rate\n"); |
|
return; |
|
} |
|
} |
|
|
|
/* |
|
* 90% of the max rate can be allocated for isochronous |
|
* transfers. |
|
*/ |
|
max_rate = ret * 90 / 100; |
|
|
|
/* No need to reclaim if already at maximum */ |
|
if (tunnel->allocated_up >= max_rate && |
|
tunnel->allocated_down >= max_rate) |
|
return; |
|
|
|
/* Don't go lower than what is already allocated */ |
|
allocate_up = min(max_rate, *available_up); |
|
if (allocate_up < tunnel->allocated_up) |
|
allocate_up = tunnel->allocated_up; |
|
|
|
allocate_down = min(max_rate, *available_down); |
|
if (allocate_down < tunnel->allocated_down) |
|
allocate_down = tunnel->allocated_down; |
|
|
|
/* If no changes no need to do more */ |
|
if (allocate_up == tunnel->allocated_up && |
|
allocate_down == tunnel->allocated_down) |
|
return; |
|
|
|
ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up, |
|
&allocate_down); |
|
if (ret) { |
|
tb_tunnel_info(tunnel, "failed to allocate bandwidth\n"); |
|
return; |
|
} |
|
|
|
tunnel->allocated_up = allocate_up; |
|
*available_up -= tunnel->allocated_up; |
|
|
|
tunnel->allocated_down = allocate_down; |
|
*available_down -= tunnel->allocated_down; |
|
|
|
tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n", |
|
tunnel->allocated_up, tunnel->allocated_down); |
|
} |
|
|
|
static void tb_usb3_init_credits(struct tb_path_hop *hop) |
|
{ |
|
struct tb_port *port = hop->in_port; |
|
struct tb_switch *sw = port->sw; |
|
unsigned int credits; |
|
|
|
if (tb_port_use_credit_allocation(port)) { |
|
credits = sw->max_usb3_credits; |
|
} else { |
|
if (tb_port_is_null(port)) |
|
credits = port->bonded ? 32 : 16; |
|
else |
|
credits = 7; |
|
} |
|
|
|
hop->initial_credits = credits; |
|
} |
|
|
|
static void tb_usb3_init_path(struct tb_path *path) |
|
{ |
|
struct tb_path_hop *hop; |
|
|
|
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
|
path->egress_shared_buffer = TB_PATH_NONE; |
|
path->ingress_fc_enable = TB_PATH_ALL; |
|
path->ingress_shared_buffer = TB_PATH_NONE; |
|
path->priority = 3; |
|
path->weight = 3; |
|
path->drop_packages = 0; |
|
|
|
tb_path_for_each_hop(path, hop) |
|
tb_usb3_init_credits(hop); |
|
} |
|
|
|
/** |
|
* tb_tunnel_discover_usb3() - Discover existing USB3 tunnels |
|
* @tb: Pointer to the domain structure |
|
* @down: USB3 downstream adapter |
|
* |
|
* If @down adapter is active, follows the tunnel to the USB3 upstream |
|
* adapter and back. Returns the discovered tunnel or %NULL if there was |
|
* no tunnel. |
|
*/ |
|
struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down) |
|
{ |
|
struct tb_tunnel *tunnel; |
|
struct tb_path *path; |
|
|
|
if (!tb_usb3_port_is_enabled(down)) |
|
return NULL; |
|
|
|
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); |
|
if (!tunnel) |
|
return NULL; |
|
|
|
tunnel->activate = tb_usb3_activate; |
|
tunnel->src_port = down; |
|
|
|
/* |
|
* Discover both paths even if they are not complete. We will |
|
* clean them up by calling tb_tunnel_deactivate() below in that |
|
* case. |
|
*/ |
|
path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1, |
|
&tunnel->dst_port, "USB3 Down"); |
|
if (!path) { |
|
/* Just disable the downstream port */ |
|
tb_usb3_port_enable(down, false); |
|
goto err_free; |
|
} |
|
tunnel->paths[TB_USB3_PATH_DOWN] = path; |
|
tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]); |
|
|
|
path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL, |
|
"USB3 Up"); |
|
if (!path) |
|
goto err_deactivate; |
|
tunnel->paths[TB_USB3_PATH_UP] = path; |
|
tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]); |
|
|
|
/* Validate that the tunnel is complete */ |
|
if (!tb_port_is_usb3_up(tunnel->dst_port)) { |
|
tb_port_warn(tunnel->dst_port, |
|
"path does not end on an USB3 adapter, cleaning up\n"); |
|
goto err_deactivate; |
|
} |
|
|
|
if (down != tunnel->src_port) { |
|
tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); |
|
goto err_deactivate; |
|
} |
|
|
|
if (!tb_usb3_port_is_enabled(tunnel->dst_port)) { |
|
tb_tunnel_warn(tunnel, |
|
"tunnel is not fully activated, cleaning up\n"); |
|
goto err_deactivate; |
|
} |
|
|
|
if (!tb_route(down->sw)) { |
|
int ret; |
|
|
|
/* |
|
* Read the initial bandwidth allocation for the first |
|
* hop tunnel. |
|
*/ |
|
ret = usb4_usb3_port_allocated_bandwidth(down, |
|
&tunnel->allocated_up, &tunnel->allocated_down); |
|
if (ret) |
|
goto err_deactivate; |
|
|
|
tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n", |
|
tunnel->allocated_up, tunnel->allocated_down); |
|
|
|
tunnel->init = tb_usb3_init; |
|
tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; |
|
tunnel->release_unused_bandwidth = |
|
tb_usb3_release_unused_bandwidth; |
|
tunnel->reclaim_available_bandwidth = |
|
tb_usb3_reclaim_available_bandwidth; |
|
} |
|
|
|
tb_tunnel_dbg(tunnel, "discovered\n"); |
|
return tunnel; |
|
|
|
err_deactivate: |
|
tb_tunnel_deactivate(tunnel); |
|
err_free: |
|
tb_tunnel_free(tunnel); |
|
|
|
return NULL; |
|
} |
|
|
|
/** |
|
* tb_tunnel_alloc_usb3() - allocate a USB3 tunnel |
|
* @tb: Pointer to the domain structure |
|
* @up: USB3 upstream adapter port |
|
* @down: USB3 downstream adapter port |
|
* @max_up: Maximum available upstream bandwidth for the USB3 tunnel (%0 |
|
* if not limited). |
|
* @max_down: Maximum available downstream bandwidth for the USB3 tunnel |
|
* (%0 if not limited). |
|
* |
|
* Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and |
|
* @TB_TYPE_USB3_DOWN. |
|
* |
|
* Return: Returns a tb_tunnel on success or %NULL on failure. |
|
*/ |
|
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up, |
|
struct tb_port *down, int max_up, |
|
int max_down) |
|
{ |
|
struct tb_tunnel *tunnel; |
|
struct tb_path *path; |
|
int max_rate = 0; |
|
|
|
/* |
|
* Check that we have enough bandwidth available for the new |
|
* USB3 tunnel. |
|
*/ |
|
if (max_up > 0 || max_down > 0) { |
|
max_rate = tb_usb3_max_link_rate(down, up); |
|
if (max_rate < 0) |
|
return NULL; |
|
|
|
/* Only 90% can be allocated for USB3 isochronous transfers */ |
|
max_rate = max_rate * 90 / 100; |
|
tb_port_dbg(up, "required bandwidth for USB3 tunnel %d Mb/s\n", |
|
max_rate); |
|
|
|
if (max_rate > max_up || max_rate > max_down) { |
|
tb_port_warn(up, "not enough bandwidth for USB3 tunnel\n"); |
|
return NULL; |
|
} |
|
} |
|
|
|
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); |
|
if (!tunnel) |
|
return NULL; |
|
|
|
tunnel->activate = tb_usb3_activate; |
|
tunnel->src_port = down; |
|
tunnel->dst_port = up; |
|
tunnel->max_up = max_up; |
|
tunnel->max_down = max_down; |
|
|
|
path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0, |
|
"USB3 Down"); |
|
if (!path) { |
|
tb_tunnel_free(tunnel); |
|
return NULL; |
|
} |
|
tb_usb3_init_path(path); |
|
tunnel->paths[TB_USB3_PATH_DOWN] = path; |
|
|
|
path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0, |
|
"USB3 Up"); |
|
if (!path) { |
|
tb_tunnel_free(tunnel); |
|
return NULL; |
|
} |
|
tb_usb3_init_path(path); |
|
tunnel->paths[TB_USB3_PATH_UP] = path; |
|
|
|
if (!tb_route(down->sw)) { |
|
tunnel->allocated_up = max_rate; |
|
tunnel->allocated_down = max_rate; |
|
|
|
tunnel->init = tb_usb3_init; |
|
tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; |
|
tunnel->release_unused_bandwidth = |
|
tb_usb3_release_unused_bandwidth; |
|
tunnel->reclaim_available_bandwidth = |
|
tb_usb3_reclaim_available_bandwidth; |
|
} |
|
|
|
return tunnel; |
|
} |
|
|
|
/** |
|
* tb_tunnel_free() - free a tunnel |
|
* @tunnel: Tunnel to be freed |
|
* |
|
* Frees a tunnel. The tunnel does not need to be deactivated. |
|
*/ |
|
void tb_tunnel_free(struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
if (!tunnel) |
|
return; |
|
|
|
if (tunnel->deinit) |
|
tunnel->deinit(tunnel); |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (tunnel->paths[i]) |
|
tb_path_free(tunnel->paths[i]); |
|
} |
|
|
|
kfree(tunnel->paths); |
|
kfree(tunnel); |
|
} |
|
|
|
/** |
|
* tb_tunnel_is_invalid - check whether an activated path is still valid |
|
* @tunnel: Tunnel to check |
|
*/ |
|
bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
WARN_ON(!tunnel->paths[i]->activated); |
|
if (tb_path_is_invalid(tunnel->paths[i])) |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
/** |
|
* tb_tunnel_restart() - activate a tunnel after a hardware reset |
|
* @tunnel: Tunnel to restart |
|
* |
|
* Return: 0 on success and negative errno in case if failure |
|
*/ |
|
int tb_tunnel_restart(struct tb_tunnel *tunnel) |
|
{ |
|
int res, i; |
|
|
|
tb_tunnel_dbg(tunnel, "activating\n"); |
|
|
|
/* |
|
* Make sure all paths are properly disabled before enabling |
|
* them again. |
|
*/ |
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (tunnel->paths[i]->activated) { |
|
tb_path_deactivate(tunnel->paths[i]); |
|
tunnel->paths[i]->activated = false; |
|
} |
|
} |
|
|
|
if (tunnel->init) { |
|
res = tunnel->init(tunnel); |
|
if (res) |
|
return res; |
|
} |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
res = tb_path_activate(tunnel->paths[i]); |
|
if (res) |
|
goto err; |
|
} |
|
|
|
if (tunnel->activate) { |
|
res = tunnel->activate(tunnel, true); |
|
if (res) |
|
goto err; |
|
} |
|
|
|
return 0; |
|
|
|
err: |
|
tb_tunnel_warn(tunnel, "activation failed\n"); |
|
tb_tunnel_deactivate(tunnel); |
|
return res; |
|
} |
|
|
|
/** |
|
* tb_tunnel_activate() - activate a tunnel |
|
* @tunnel: Tunnel to activate |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
int tb_tunnel_activate(struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (tunnel->paths[i]->activated) { |
|
tb_tunnel_WARN(tunnel, |
|
"trying to activate an already activated tunnel\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return tb_tunnel_restart(tunnel); |
|
} |
|
|
|
/** |
|
* tb_tunnel_deactivate() - deactivate a tunnel |
|
* @tunnel: Tunnel to deactivate |
|
*/ |
|
void tb_tunnel_deactivate(struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
tb_tunnel_dbg(tunnel, "deactivating\n"); |
|
|
|
if (tunnel->activate) |
|
tunnel->activate(tunnel, false); |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (tunnel->paths[i] && tunnel->paths[i]->activated) |
|
tb_path_deactivate(tunnel->paths[i]); |
|
} |
|
} |
|
|
|
/** |
|
* tb_tunnel_port_on_path() - Does the tunnel go through port |
|
* @tunnel: Tunnel to check |
|
* @port: Port to check |
|
* |
|
* Returns true if @tunnel goes through @port (direction does not matter), |
|
* false otherwise. |
|
*/ |
|
bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel, |
|
const struct tb_port *port) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (!tunnel->paths[i]) |
|
continue; |
|
|
|
if (tb_path_port_on_path(tunnel->paths[i], port)) |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tunnel->npaths; i++) { |
|
if (!tunnel->paths[i]) |
|
return false; |
|
if (!tunnel->paths[i]->activated) |
|
return false; |
|
} |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel |
|
* @tunnel: Tunnel to check |
|
* @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port. |
|
* Can be %NULL. |
|
* @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port. |
|
* Can be %NULL. |
|
* |
|
* Stores the amount of isochronous bandwidth @tunnel consumes in |
|
* @consumed_up and @consumed_down. In case of success returns %0, |
|
* negative errno otherwise. |
|
*/ |
|
int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, |
|
int *consumed_down) |
|
{ |
|
int up_bw = 0, down_bw = 0; |
|
|
|
if (!tb_tunnel_is_active(tunnel)) |
|
goto out; |
|
|
|
if (tunnel->consumed_bandwidth) { |
|
int ret; |
|
|
|
ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw); |
|
if (ret) |
|
return ret; |
|
|
|
tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw, |
|
down_bw); |
|
} |
|
|
|
out: |
|
if (consumed_up) |
|
*consumed_up = up_bw; |
|
if (consumed_down) |
|
*consumed_down = down_bw; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* tb_tunnel_release_unused_bandwidth() - Release unused bandwidth |
|
* @tunnel: Tunnel whose unused bandwidth to release |
|
* |
|
* If tunnel supports dynamic bandwidth management (USB3 tunnels at the |
|
* moment) this function makes it to release all the unused bandwidth. |
|
* |
|
* Returns %0 in case of success and negative errno otherwise. |
|
*/ |
|
int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel) |
|
{ |
|
if (!tb_tunnel_is_active(tunnel)) |
|
return 0; |
|
|
|
if (tunnel->release_unused_bandwidth) { |
|
int ret; |
|
|
|
ret = tunnel->release_unused_bandwidth(tunnel); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth |
|
* @tunnel: Tunnel reclaiming available bandwidth |
|
* @available_up: Available upstream bandwidth (in Mb/s) |
|
* @available_down: Available downstream bandwidth (in Mb/s) |
|
* |
|
* Reclaims bandwidth from @available_up and @available_down and updates |
|
* the variables accordingly (e.g decreases both according to what was |
|
* reclaimed by the tunnel). If nothing was reclaimed the values are |
|
* kept as is. |
|
*/ |
|
void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel, |
|
int *available_up, |
|
int *available_down) |
|
{ |
|
if (!tb_tunnel_is_active(tunnel)) |
|
return; |
|
|
|
if (tunnel->reclaim_available_bandwidth) |
|
tunnel->reclaim_available_bandwidth(tunnel, available_up, |
|
available_down); |
|
}
|
|
|