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![Gil Fine](/assets/img/avatar_default.png)
In case of no bandwidth available for DP tunnel, the function get the arguments @max_up and @max_down set to zero. Fix the kernel-doc to describe more accurately the purpose of the function. No functional changes. Signed-off-by: Gil Fine <gil.fine@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2454 lines
61 KiB
C
2454 lines
61 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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#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 <linux/ktime.h>
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#include <linux/string_helpers.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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#define TB_PCI_PRIORITY 3
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#define TB_PCI_WEIGHT 1
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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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#define TB_USB3_PATH_DOWN 0
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#define TB_USB3_PATH_UP 1
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#define TB_USB3_PRIORITY 3
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#define TB_USB3_WEIGHT 2
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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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#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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#define TB_DP_VIDEO_PRIORITY 1
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#define TB_DP_VIDEO_WEIGHT 1
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#define TB_DP_AUX_PRIORITY 2
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#define TB_DP_AUX_WEIGHT 1
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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 14
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/* Minimum number of credits for DMA path */
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#define TB_MIN_DMA_CREDITS 1
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#define TB_DMA_PRIORITY 5
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#define TB_DMA_WEIGHT 1
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/*
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* Reserve additional bandwidth for USB 3.x and PCIe bulk traffic
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* according to USB4 v2 Connection Manager guide. This ends up reserving
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* 1500 Mb/s for PCIe and 3000 Mb/s for USB 3.x taking weights into
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* account.
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*/
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#define USB4_V2_PCI_MIN_BANDWIDTH (1500 * TB_PCI_WEIGHT)
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#define USB4_V2_USB3_MIN_BANDWIDTH (1500 * TB_USB3_WEIGHT)
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static unsigned int dma_credits = TB_DMA_CREDITS;
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module_param(dma_credits, uint, 0444);
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MODULE_PARM_DESC(dma_credits, "specify custom credits for DMA tunnels (default: "
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__MODULE_STRING(TB_DMA_CREDITS) ")");
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static bool bw_alloc_mode = true;
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module_param(bw_alloc_mode, bool, 0444);
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MODULE_PARM_DESC(bw_alloc_mode,
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"enable bandwidth allocation mode if supported (default: true)");
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static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
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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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* 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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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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if (tb_acpi_is_xdomain_allowed()) {
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spare = min_not_zero(sw->max_dma_credits, 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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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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if (sw->min_dp_aux_credits + sw->min_dp_main_credits)
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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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} 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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if (max_dp_streams)
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*max_dp_streams = ndp;
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return credits > 0 ? credits : 0;
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}
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static void tb_init_pm_support(struct tb_path_hop *hop)
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{
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struct tb_port *out_port = hop->out_port;
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struct tb_port *in_port = hop->in_port;
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if (tb_port_is_null(in_port) && tb_port_is_null(out_port) &&
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usb4_switch_version(in_port->sw) >= 2)
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hop->pm_support = true;
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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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tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
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if (!tunnel)
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return NULL;
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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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static int tb_pci_set_ext_encapsulation(struct tb_tunnel *tunnel, bool enable)
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{
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struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);
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int ret;
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/* Only supported of both routers are at least USB4 v2 */
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if ((usb4_switch_version(tunnel->src_port->sw) < 2) ||
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(usb4_switch_version(tunnel->dst_port->sw) < 2))
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return 0;
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if (enable && tb_port_get_link_generation(port) < 4)
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return 0;
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ret = usb4_pci_port_set_ext_encapsulation(tunnel->src_port, enable);
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if (ret)
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return ret;
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/*
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* Downstream router could be unplugged so disable of encapsulation
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* in upstream router is still possible.
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*/
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ret = usb4_pci_port_set_ext_encapsulation(tunnel->dst_port, enable);
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if (ret) {
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if (enable)
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return ret;
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if (ret != -ENODEV)
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return ret;
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}
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tb_tunnel_dbg(tunnel, "extended encapsulation %s\n",
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str_enabled_disabled(enable));
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return 0;
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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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if (activate) {
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res = tb_pci_set_ext_encapsulation(tunnel, activate);
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if (res)
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return res;
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}
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if (activate)
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res = tb_pci_port_enable(tunnel->dst_port, activate);
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else
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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 (activate) {
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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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} else {
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/* Downstream router could be unplugged */
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tb_pci_port_enable(tunnel->dst_port, activate);
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}
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return activate ? 0 : tb_pci_set_ext_encapsulation(tunnel, activate);
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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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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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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 = TB_PCI_PRIORITY;
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path->weight = TB_PCI_WEIGHT;
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path->drop_packages = 0;
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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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* @alloc_hopid: Allocate HopIDs from visited ports
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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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bool alloc_hopid)
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{
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struct tb_tunnel *tunnel;
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struct tb_path *path;
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if (!tb_pci_port_is_enabled(down))
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return NULL;
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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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/*
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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", alloc_hopid);
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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", alloc_hopid);
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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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/* 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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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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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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return NULL;
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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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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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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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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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return tunnel;
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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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/**
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* tb_tunnel_reserved_pci() - Amount of bandwidth to reserve for PCIe
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* @port: Lane 0 adapter
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* @reserved_up: Upstream bandwidth in Mb/s to reserve
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* @reserved_down: Downstream bandwidth in Mb/s to reserve
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*
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* Can be called to any connected lane 0 adapter to find out how much
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* bandwidth needs to be left in reserve for possible PCIe bulk traffic.
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* Returns true if there is something to be reserved and writes the
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* amount to @reserved_down/@reserved_up. Otherwise returns false and
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* does not touch the parameters.
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*/
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bool tb_tunnel_reserved_pci(struct tb_port *port, int *reserved_up,
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int *reserved_down)
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{
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if (WARN_ON_ONCE(!port->remote))
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return false;
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if (!tb_acpi_may_tunnel_pcie())
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return false;
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if (tb_port_get_link_generation(port) < 4)
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return false;
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/* Must have PCIe adapters */
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if (tb_is_upstream_port(port)) {
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if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_UP))
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return false;
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if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_DOWN))
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return false;
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} else {
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if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_DOWN))
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return false;
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if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_UP))
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return false;
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}
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*reserved_up = USB4_V2_PCI_MIN_BANDWIDTH;
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*reserved_down = USB4_V2_PCI_MIN_BANDWIDTH;
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tb_port_dbg(port, "reserving %u/%u Mb/s for PCIe\n", *reserved_up,
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*reserved_down);
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return true;
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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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static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out,
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int timeout_msec)
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{
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ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
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u32 val;
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int ret;
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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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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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val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS;
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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(100, 150);
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} while (ktime_before(ktime_get(), timeout));
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return -ETIMEDOUT;
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}
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|
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/*
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* Returns maximum possible rate from capability supporting only DP 2.0
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* and below. Used when DP BW allocation mode is not enabled.
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*/
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static inline u32 tb_dp_cap_get_rate(u32 val)
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{
|
|
u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT;
|
|
|
|
switch (rate) {
|
|
case DP_COMMON_CAP_RATE_RBR:
|
|
return 1620;
|
|
case DP_COMMON_CAP_RATE_HBR:
|
|
return 2700;
|
|
case DP_COMMON_CAP_RATE_HBR2:
|
|
return 5400;
|
|
case DP_COMMON_CAP_RATE_HBR3:
|
|
return 8100;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns maximum possible rate from capability supporting DP 2.1
|
|
* UHBR20, 13.5 and 10 rates as well. Use only when DP BW allocation
|
|
* mode is enabled.
|
|
*/
|
|
static inline u32 tb_dp_cap_get_rate_ext(u32 val)
|
|
{
|
|
if (val & DP_COMMON_CAP_UHBR20)
|
|
return 20000;
|
|
else if (val & DP_COMMON_CAP_UHBR13_5)
|
|
return 13500;
|
|
else if (val & DP_COMMON_CAP_UHBR10)
|
|
return 10000;
|
|
|
|
return tb_dp_cap_get_rate(val);
|
|
}
|
|
|
|
static inline bool tb_dp_is_uhbr_rate(unsigned int rate)
|
|
{
|
|
return rate >= 10000;
|
|
}
|
|
|
|
static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate)
|
|
{
|
|
val &= ~DP_COMMON_CAP_RATE_MASK;
|
|
switch (rate) {
|
|
default:
|
|
WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate);
|
|
fallthrough;
|
|
case 1620:
|
|
val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT;
|
|
break;
|
|
case 2700:
|
|
val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT;
|
|
break;
|
|
case 5400:
|
|
val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT;
|
|
break;
|
|
case 8100:
|
|
val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT;
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static inline u32 tb_dp_cap_get_lanes(u32 val)
|
|
{
|
|
u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT;
|
|
|
|
switch (lanes) {
|
|
case DP_COMMON_CAP_1_LANE:
|
|
return 1;
|
|
case DP_COMMON_CAP_2_LANES:
|
|
return 2;
|
|
case DP_COMMON_CAP_4_LANES:
|
|
return 4;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes)
|
|
{
|
|
val &= ~DP_COMMON_CAP_LANES_MASK;
|
|
switch (lanes) {
|
|
default:
|
|
WARN(1, "invalid number of lanes %u passed, defaulting to 1\n",
|
|
lanes);
|
|
fallthrough;
|
|
case 1:
|
|
val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT;
|
|
break;
|
|
case 2:
|
|
val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT;
|
|
break;
|
|
case 4:
|
|
val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT;
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes)
|
|
{
|
|
/* Tunneling removes the DP 8b/10b 128/132b encoding */
|
|
if (tb_dp_is_uhbr_rate(rate))
|
|
return rate * lanes * 128 / 132;
|
|
return rate * lanes * 8 / 10;
|
|
}
|
|
|
|
static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes,
|
|
u32 out_rate, u32 out_lanes, u32 *new_rate,
|
|
u32 *new_lanes)
|
|
{
|
|
static const u32 dp_bw[][2] = {
|
|
/* Mb/s, lanes */
|
|
{ 8100, 4 }, /* 25920 Mb/s */
|
|
{ 5400, 4 }, /* 17280 Mb/s */
|
|
{ 8100, 2 }, /* 12960 Mb/s */
|
|
{ 2700, 4 }, /* 8640 Mb/s */
|
|
{ 5400, 2 }, /* 8640 Mb/s */
|
|
{ 8100, 1 }, /* 6480 Mb/s */
|
|
{ 1620, 4 }, /* 5184 Mb/s */
|
|
{ 5400, 1 }, /* 4320 Mb/s */
|
|
{ 2700, 2 }, /* 4320 Mb/s */
|
|
{ 1620, 2 }, /* 2592 Mb/s */
|
|
{ 2700, 1 }, /* 2160 Mb/s */
|
|
{ 1620, 1 }, /* 1296 Mb/s */
|
|
};
|
|
unsigned int i;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(dp_bw); i++) {
|
|
if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes)
|
|
continue;
|
|
|
|
if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes)
|
|
continue;
|
|
|
|
if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) {
|
|
*new_rate = dp_bw[i][0];
|
|
*new_lanes = dp_bw[i][1];
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -ENOSR;
|
|
}
|
|
|
|
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;
|
|
struct tb_port *out = tunnel->dst_port;
|
|
struct tb_port *in = tunnel->src_port;
|
|
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, 3000);
|
|
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;
|
|
|
|
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,
|
|
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_tunnel_dbg(tunnel,
|
|
"DP 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_tunnel_dbg(tunnel,
|
|
"DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
|
|
out_rate, out_lanes, bw);
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel))
|
|
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_tunnel_info(tunnel, "not enough bandwidth\n");
|
|
return ret;
|
|
}
|
|
|
|
new_bw = tb_dp_bandwidth(new_rate, new_lanes);
|
|
tb_tunnel_dbg(tunnel,
|
|
"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);
|
|
}
|
|
|
|
/*
|
|
* Titan Ridge does not disable AUX timers when it gets
|
|
* SET_CONFIG with SET_LTTPR_MODE set. This causes problems with
|
|
* DP tunneling.
|
|
*/
|
|
if (tb_route(out->sw) && tb_switch_is_titan_ridge(out->sw)) {
|
|
out_dp_cap |= DP_COMMON_CAP_LTTPR_NS;
|
|
tb_tunnel_dbg(tunnel, "disabling LTTPR\n");
|
|
}
|
|
|
|
return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,
|
|
in->cap_adap + DP_REMOTE_CAP, 1);
|
|
}
|
|
|
|
static int tb_dp_bandwidth_alloc_mode_enable(struct tb_tunnel *tunnel)
|
|
{
|
|
int ret, estimated_bw, granularity, tmp;
|
|
struct tb_port *out = tunnel->dst_port;
|
|
struct tb_port *in = tunnel->src_port;
|
|
u32 out_dp_cap, out_rate, out_lanes;
|
|
u32 in_dp_cap, in_rate, in_lanes;
|
|
u32 rate, lanes;
|
|
|
|
if (!bw_alloc_mode)
|
|
return 0;
|
|
|
|
ret = usb4_dp_port_set_cm_bandwidth_mode_supported(in, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_dp_port_set_group_id(in, in->group->index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Get the non-reduced rate and lanes based on the lowest
|
|
* capability of both adapters.
|
|
*/
|
|
ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,
|
|
in->cap_adap + DP_LOCAL_CAP, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,
|
|
out->cap_adap + DP_LOCAL_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);
|
|
out_rate = tb_dp_cap_get_rate(out_dp_cap);
|
|
out_lanes = tb_dp_cap_get_lanes(out_dp_cap);
|
|
|
|
rate = min(in_rate, out_rate);
|
|
lanes = min(in_lanes, out_lanes);
|
|
tmp = tb_dp_bandwidth(rate, lanes);
|
|
|
|
tb_tunnel_dbg(tunnel, "non-reduced bandwidth %u Mb/s x%u = %u Mb/s\n",
|
|
rate, lanes, tmp);
|
|
|
|
ret = usb4_dp_port_set_nrd(in, rate, lanes);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Pick up granularity that supports maximum possible bandwidth.
|
|
* For that we use the UHBR rates too.
|
|
*/
|
|
in_rate = tb_dp_cap_get_rate_ext(in_dp_cap);
|
|
out_rate = tb_dp_cap_get_rate_ext(out_dp_cap);
|
|
rate = min(in_rate, out_rate);
|
|
tmp = tb_dp_bandwidth(rate, lanes);
|
|
|
|
tb_tunnel_dbg(tunnel,
|
|
"maximum bandwidth through allocation mode %u Mb/s x%u = %u Mb/s\n",
|
|
rate, lanes, tmp);
|
|
|
|
for (granularity = 250; tmp / granularity > 255 && granularity <= 1000;
|
|
granularity *= 2)
|
|
;
|
|
|
|
tb_tunnel_dbg(tunnel, "granularity %d Mb/s\n", granularity);
|
|
|
|
/*
|
|
* Returns -EINVAL if granularity above is outside of the
|
|
* accepted ranges.
|
|
*/
|
|
ret = usb4_dp_port_set_granularity(in, granularity);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Bandwidth estimation is pretty much what we have in
|
|
* max_up/down fields. For discovery we just read what the
|
|
* estimation was set to.
|
|
*/
|
|
if (tb_tunnel_direction_downstream(tunnel))
|
|
estimated_bw = tunnel->max_down;
|
|
else
|
|
estimated_bw = tunnel->max_up;
|
|
|
|
tb_tunnel_dbg(tunnel, "estimated bandwidth %d Mb/s\n", estimated_bw);
|
|
|
|
ret = usb4_dp_port_set_estimated_bandwidth(in, estimated_bw);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Initial allocation should be 0 according the spec */
|
|
ret = usb4_dp_port_allocate_bandwidth(in, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tb_tunnel_dbg(tunnel, "bandwidth allocation mode enabled\n");
|
|
return 0;
|
|
}
|
|
|
|
static int tb_dp_init(struct tb_tunnel *tunnel)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
struct tb_switch *sw = in->sw;
|
|
struct tb *tb = in->sw->tb;
|
|
int ret;
|
|
|
|
ret = tb_dp_xchg_caps(tunnel);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!tb_switch_is_usb4(sw))
|
|
return 0;
|
|
|
|
if (!usb4_dp_port_bandwidth_mode_supported(in))
|
|
return 0;
|
|
|
|
tb_tunnel_dbg(tunnel, "bandwidth allocation mode supported\n");
|
|
|
|
ret = usb4_dp_port_set_cm_id(in, tb->index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tb_dp_bandwidth_alloc_mode_enable(tunnel);
|
|
}
|
|
|
|
static void tb_dp_deinit(struct tb_tunnel *tunnel)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
|
|
if (!usb4_dp_port_bandwidth_mode_supported(in))
|
|
return;
|
|
if (usb4_dp_port_bandwidth_mode_enabled(in)) {
|
|
usb4_dp_port_set_cm_bandwidth_mode_supported(in, false);
|
|
tb_tunnel_dbg(tunnel, "bandwidth allocation mode disabled\n");
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* tb_dp_bandwidth_mode_maximum_bandwidth() - Maximum possible bandwidth
|
|
* @tunnel: DP tunnel to check
|
|
* @max_bw_rounded: Maximum bandwidth in Mb/s rounded up to the next granularity
|
|
*
|
|
* Returns maximum possible bandwidth for this tunnel in Mb/s.
|
|
*/
|
|
static int tb_dp_bandwidth_mode_maximum_bandwidth(struct tb_tunnel *tunnel,
|
|
int *max_bw_rounded)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
int ret, rate, lanes, max_bw;
|
|
u32 cap;
|
|
|
|
/*
|
|
* DP IN adapter DP_LOCAL_CAP gets updated to the lowest AUX
|
|
* read parameter values so this so we can use this to determine
|
|
* the maximum possible bandwidth over this link.
|
|
*
|
|
* See USB4 v2 spec 1.0 10.4.4.5.
|
|
*/
|
|
ret = tb_port_read(in, &cap, TB_CFG_PORT,
|
|
in->cap_adap + DP_LOCAL_CAP, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
rate = tb_dp_cap_get_rate_ext(cap);
|
|
lanes = tb_dp_cap_get_lanes(cap);
|
|
|
|
max_bw = tb_dp_bandwidth(rate, lanes);
|
|
|
|
if (max_bw_rounded) {
|
|
ret = usb4_dp_port_granularity(in);
|
|
if (ret < 0)
|
|
return ret;
|
|
*max_bw_rounded = roundup(max_bw, ret);
|
|
}
|
|
|
|
return max_bw;
|
|
}
|
|
|
|
static int tb_dp_bandwidth_mode_consumed_bandwidth(struct tb_tunnel *tunnel,
|
|
int *consumed_up,
|
|
int *consumed_down)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
int ret, allocated_bw, max_bw_rounded;
|
|
|
|
if (!usb4_dp_port_bandwidth_mode_enabled(in))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!tunnel->bw_mode)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Read what was allocated previously if any */
|
|
ret = usb4_dp_port_allocated_bandwidth(in);
|
|
if (ret < 0)
|
|
return ret;
|
|
allocated_bw = ret;
|
|
|
|
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (allocated_bw == max_bw_rounded)
|
|
allocated_bw = ret;
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel)) {
|
|
*consumed_up = 0;
|
|
*consumed_down = allocated_bw;
|
|
} else {
|
|
*consumed_up = allocated_bw;
|
|
*consumed_down = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tb_dp_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
|
|
int *allocated_down)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
|
|
/*
|
|
* If we have already set the allocated bandwidth then use that.
|
|
* Otherwise we read it from the DPRX.
|
|
*/
|
|
if (usb4_dp_port_bandwidth_mode_enabled(in) && tunnel->bw_mode) {
|
|
int ret, allocated_bw, max_bw_rounded;
|
|
|
|
ret = usb4_dp_port_allocated_bandwidth(in);
|
|
if (ret < 0)
|
|
return ret;
|
|
allocated_bw = ret;
|
|
|
|
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel,
|
|
&max_bw_rounded);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (allocated_bw == max_bw_rounded)
|
|
allocated_bw = ret;
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel)) {
|
|
*allocated_up = 0;
|
|
*allocated_down = allocated_bw;
|
|
} else {
|
|
*allocated_up = allocated_bw;
|
|
*allocated_down = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return tunnel->consumed_bandwidth(tunnel, allocated_up,
|
|
allocated_down);
|
|
}
|
|
|
|
static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
|
|
int *alloc_down)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
int max_bw_rounded, ret, tmp;
|
|
|
|
if (!usb4_dp_port_bandwidth_mode_enabled(in))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel)) {
|
|
tmp = min(*alloc_down, max_bw_rounded);
|
|
ret = usb4_dp_port_allocate_bandwidth(in, tmp);
|
|
if (ret)
|
|
return ret;
|
|
*alloc_down = tmp;
|
|
*alloc_up = 0;
|
|
} else {
|
|
tmp = min(*alloc_up, max_bw_rounded);
|
|
ret = usb4_dp_port_allocate_bandwidth(in, tmp);
|
|
if (ret)
|
|
return ret;
|
|
*alloc_down = 0;
|
|
*alloc_up = tmp;
|
|
}
|
|
|
|
/* Now we can use BW mode registers to figure out the bandwidth */
|
|
/* TODO: need to handle discovery too */
|
|
tunnel->bw_mode = true;
|
|
return 0;
|
|
}
|
|
|
|
static int tb_dp_wait_dprx(struct tb_tunnel *tunnel, int timeout_msec)
|
|
{
|
|
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
|
|
struct tb_port *in = tunnel->src_port;
|
|
|
|
/*
|
|
* Wait for DPRX done. Normally it should be already set for
|
|
* active tunnel.
|
|
*/
|
|
do {
|
|
u32 val;
|
|
int ret;
|
|
|
|
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) {
|
|
tb_tunnel_dbg(tunnel, "DPRX read done\n");
|
|
return 0;
|
|
}
|
|
usleep_range(100, 150);
|
|
} while (ktime_before(ktime_get(), timeout));
|
|
|
|
tb_tunnel_dbg(tunnel, "DPRX read timeout\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/* Read cap from tunnel DP IN */
|
|
static int tb_dp_read_cap(struct tb_tunnel *tunnel, unsigned int cap, u32 *rate,
|
|
u32 *lanes)
|
|
{
|
|
struct tb_port *in = tunnel->src_port;
|
|
u32 val;
|
|
int ret;
|
|
|
|
switch (cap) {
|
|
case DP_LOCAL_CAP:
|
|
case DP_REMOTE_CAP:
|
|
case DP_COMMON_CAP:
|
|
break;
|
|
|
|
default:
|
|
tb_tunnel_WARN(tunnel, "invalid capability index %#x\n", cap);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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 + cap, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*rate = tb_dp_cap_get_rate(val);
|
|
*lanes = tb_dp_cap_get_lanes(val);
|
|
return 0;
|
|
}
|
|
|
|
static int tb_dp_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
|
|
int *max_down)
|
|
{
|
|
int ret;
|
|
|
|
if (!usb4_dp_port_bandwidth_mode_enabled(tunnel->src_port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel)) {
|
|
*max_up = 0;
|
|
*max_down = ret;
|
|
} else {
|
|
*max_up = ret;
|
|
*max_down = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
|
|
int *consumed_down)
|
|
{
|
|
const struct tb_switch *sw = tunnel->src_port->sw;
|
|
u32 rate = 0, lanes = 0;
|
|
int ret;
|
|
|
|
if (tb_dp_is_usb4(sw)) {
|
|
/*
|
|
* On USB4 routers check if the bandwidth allocation
|
|
* mode is enabled first and then read the bandwidth
|
|
* through those registers.
|
|
*/
|
|
ret = tb_dp_bandwidth_mode_consumed_bandwidth(tunnel, consumed_up,
|
|
consumed_down);
|
|
if (ret < 0) {
|
|
if (ret != -EOPNOTSUPP)
|
|
return ret;
|
|
} else if (!ret) {
|
|
return 0;
|
|
}
|
|
/*
|
|
* Then see if the DPRX negotiation is ready and if yes
|
|
* return that bandwidth (it may be smaller than the
|
|
* reduced one). According to VESA spec, the DPRX
|
|
* negotiation shall compete in 5 seconds after tunnel
|
|
* established. We give it 100ms extra just in case.
|
|
*/
|
|
ret = tb_dp_wait_dprx(tunnel, 5100);
|
|
if (ret)
|
|
return ret;
|
|
ret = tb_dp_read_cap(tunnel, DP_COMMON_CAP, &rate, &lanes);
|
|
if (ret)
|
|
return ret;
|
|
} else if (sw->generation >= 2) {
|
|
ret = tb_dp_read_cap(tunnel, DP_REMOTE_CAP, &rate, &lanes);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
/* No bandwidth management for legacy devices */
|
|
*consumed_up = 0;
|
|
*consumed_down = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (tb_tunnel_direction_downstream(tunnel)) {
|
|
*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, bool pm_support)
|
|
{
|
|
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 = TB_DP_AUX_PRIORITY;
|
|
path->weight = TB_DP_AUX_WEIGHT;
|
|
|
|
tb_path_for_each_hop(path, hop) {
|
|
tb_dp_init_aux_credits(hop);
|
|
if (pm_support)
|
|
tb_init_pm_support(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, bool pm_support)
|
|
{
|
|
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 = TB_DP_VIDEO_PRIORITY;
|
|
path->weight = TB_DP_VIDEO_WEIGHT;
|
|
|
|
tb_path_for_each_hop(path, hop) {
|
|
int ret;
|
|
|
|
ret = tb_dp_init_video_credits(hop);
|
|
if (ret)
|
|
return ret;
|
|
if (pm_support)
|
|
tb_init_pm_support(hop);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tb_dp_dump(struct tb_tunnel *tunnel)
|
|
{
|
|
struct tb_port *in, *out;
|
|
u32 dp_cap, rate, lanes;
|
|
|
|
in = tunnel->src_port;
|
|
out = tunnel->dst_port;
|
|
|
|
if (tb_port_read(in, &dp_cap, TB_CFG_PORT,
|
|
in->cap_adap + DP_LOCAL_CAP, 1))
|
|
return;
|
|
|
|
rate = tb_dp_cap_get_rate(dp_cap);
|
|
lanes = tb_dp_cap_get_lanes(dp_cap);
|
|
|
|
tb_tunnel_dbg(tunnel,
|
|
"DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
|
|
rate, lanes, tb_dp_bandwidth(rate, lanes));
|
|
|
|
if (tb_port_read(out, &dp_cap, TB_CFG_PORT,
|
|
out->cap_adap + DP_LOCAL_CAP, 1))
|
|
return;
|
|
|
|
rate = tb_dp_cap_get_rate(dp_cap);
|
|
lanes = tb_dp_cap_get_lanes(dp_cap);
|
|
|
|
tb_tunnel_dbg(tunnel,
|
|
"DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
|
|
rate, lanes, tb_dp_bandwidth(rate, lanes));
|
|
|
|
if (tb_port_read(in, &dp_cap, TB_CFG_PORT,
|
|
in->cap_adap + DP_REMOTE_CAP, 1))
|
|
return;
|
|
|
|
rate = tb_dp_cap_get_rate(dp_cap);
|
|
lanes = tb_dp_cap_get_lanes(dp_cap);
|
|
|
|
tb_tunnel_dbg(tunnel, "reduced bandwidth %u Mb/s x%u = %u Mb/s\n",
|
|
rate, lanes, tb_dp_bandwidth(rate, lanes));
|
|
}
|
|
|
|
/**
|
|
* tb_tunnel_discover_dp() - Discover existing Display Port tunnels
|
|
* @tb: Pointer to the domain structure
|
|
* @in: DP in adapter
|
|
* @alloc_hopid: Allocate HopIDs from visited ports
|
|
*
|
|
* 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,
|
|
bool alloc_hopid)
|
|
{
|
|
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_init;
|
|
tunnel->deinit = tb_dp_deinit;
|
|
tunnel->activate = tb_dp_activate;
|
|
tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;
|
|
tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;
|
|
tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;
|
|
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", alloc_hopid);
|
|
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], false))
|
|
goto err_free;
|
|
|
|
path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX",
|
|
alloc_hopid);
|
|
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], false);
|
|
|
|
path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
|
|
&port, "AUX RX", alloc_hopid);
|
|
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], false);
|
|
|
|
/* 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_dp_dump(tunnel);
|
|
|
|
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
|
|
* @link_nr: Preferred lane adapter when the link is not bonded
|
|
* @max_up: Maximum available upstream bandwidth for the DP tunnel.
|
|
* %0 if no available bandwidth.
|
|
* @max_down: Maximum available downstream bandwidth for the DP tunnel.
|
|
* %0 if no available bandwidth.
|
|
*
|
|
* 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 link_nr,
|
|
int max_up, int max_down)
|
|
{
|
|
struct tb_tunnel *tunnel;
|
|
struct tb_path **paths;
|
|
struct tb_path *path;
|
|
bool pm_support;
|
|
|
|
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_init;
|
|
tunnel->deinit = tb_dp_deinit;
|
|
tunnel->activate = tb_dp_activate;
|
|
tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;
|
|
tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;
|
|
tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;
|
|
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;
|
|
pm_support = usb4_switch_version(in->sw) >= 2;
|
|
|
|
path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,
|
|
link_nr, "Video");
|
|
if (!path)
|
|
goto err_free;
|
|
tb_dp_init_video_path(path, pm_support);
|
|
paths[TB_DP_VIDEO_PATH_OUT] = path;
|
|
|
|
path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
|
|
TB_DP_AUX_TX_HOPID, link_nr, "AUX TX");
|
|
if (!path)
|
|
goto err_free;
|
|
tb_dp_init_aux_path(path, pm_support);
|
|
paths[TB_DP_AUX_PATH_OUT] = path;
|
|
|
|
path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,
|
|
TB_DP_AUX_RX_HOPID, link_nr, "AUX RX");
|
|
if (!path)
|
|
goto err_free;
|
|
tb_dp_init_aux_path(path, pm_support);
|
|
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 = TB_DMA_PRIORITY;
|
|
path->weight = TB_DMA_WEIGHT;
|
|
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 = TB_DMA_PRIORITY;
|
|
path->weight = TB_DMA_WEIGHT;
|
|
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;
|
|
|
|
/* Ring 0 is reserved for control channel */
|
|
if (WARN_ON(!receive_ring || !transmit_ring))
|
|
return NULL;
|
|
|
|
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(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)
|
|
{
|
|
struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);
|
|
int pcie_weight = tb_acpi_may_tunnel_pcie() ? TB_PCI_WEIGHT : 0;
|
|
|
|
/*
|
|
* PCIe tunneling, if enabled, affects the USB3 bandwidth so
|
|
* take that it into account here.
|
|
*/
|
|
*consumed_up = tunnel->allocated_up *
|
|
(TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;
|
|
*consumed_down = tunnel->allocated_down *
|
|
(TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;
|
|
|
|
if (tb_port_get_link_generation(port) >= 4) {
|
|
*consumed_up = max(*consumed_up, USB4_V2_USB3_MIN_BANDWIDTH);
|
|
*consumed_down = max(*consumed_down, USB4_V2_USB3_MIN_BANDWIDTH);
|
|
}
|
|
|
|
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 = tb_usb3_max_link_rate(tunnel->dst_port, 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 = TB_USB3_PRIORITY;
|
|
path->weight = TB_USB3_WEIGHT;
|
|
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
|
|
* @alloc_hopid: Allocate HopIDs from visited ports
|
|
*
|
|
* 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,
|
|
bool alloc_hopid)
|
|
{
|
|
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", alloc_hopid);
|
|
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", alloc_hopid);
|
|
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 no available bandwidth.
|
|
* @max_down: Maximum available downstream bandwidth for the USB3 tunnel.
|
|
* %0 if no available bandwidth.
|
|
*
|
|
* 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;
|
|
|
|
if (!tb_route(down->sw) && (max_up > 0 || max_down > 0)) {
|
|
/*
|
|
* For USB3 isochronous transfers, we allow bandwidth which is
|
|
* not higher than 90% of maximum supported bandwidth by USB3
|
|
* adapters.
|
|
*/
|
|
max_rate = tb_usb3_max_link_rate(down, up);
|
|
if (max_rate < 0)
|
|
return NULL;
|
|
|
|
max_rate = max_rate * 90 / 100;
|
|
tb_port_dbg(up, "maximum required bandwidth for USB3 tunnel %d Mb/s\n",
|
|
max_rate);
|
|
}
|
|
|
|
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 = min(max_rate, max_up);
|
|
tunnel->allocated_down = min(max_rate, max_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;
|
|
}
|
|
|
|
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_maximum_bandwidth() - Return maximum possible bandwidth
|
|
* @tunnel: Tunnel to check
|
|
* @max_up: Maximum upstream bandwidth in Mb/s
|
|
* @max_down: Maximum downstream bandwidth in Mb/s
|
|
*
|
|
* Returns maximum possible bandwidth this tunnel can go if not limited
|
|
* by other bandwidth clients. If the tunnel does not support this
|
|
* returns %-EOPNOTSUPP.
|
|
*/
|
|
int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
|
|
int *max_down)
|
|
{
|
|
if (!tb_tunnel_is_active(tunnel))
|
|
return -EINVAL;
|
|
|
|
if (tunnel->maximum_bandwidth)
|
|
return tunnel->maximum_bandwidth(tunnel, max_up, max_down);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/**
|
|
* tb_tunnel_allocated_bandwidth() - Return bandwidth allocated for the tunnel
|
|
* @tunnel: Tunnel to check
|
|
* @allocated_up: Currently allocated upstream bandwidth in Mb/s is stored here
|
|
* @allocated_down: Currently allocated downstream bandwidth in Mb/s is
|
|
* stored here
|
|
*
|
|
* Returns the bandwidth allocated for the tunnel. This may be higher
|
|
* than what the tunnel actually consumes.
|
|
*/
|
|
int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
|
|
int *allocated_down)
|
|
{
|
|
if (!tb_tunnel_is_active(tunnel))
|
|
return -EINVAL;
|
|
|
|
if (tunnel->allocated_bandwidth)
|
|
return tunnel->allocated_bandwidth(tunnel, allocated_up,
|
|
allocated_down);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/**
|
|
* tb_tunnel_alloc_bandwidth() - Change tunnel bandwidth allocation
|
|
* @tunnel: Tunnel whose bandwidth allocation to change
|
|
* @alloc_up: New upstream bandwidth in Mb/s
|
|
* @alloc_down: New downstream bandwidth in Mb/s
|
|
*
|
|
* Tries to change tunnel bandwidth allocation. If succeeds returns %0
|
|
* and updates @alloc_up and @alloc_down to that was actually allocated
|
|
* (it may not be the same as passed originally). Returns negative errno
|
|
* in case of failure.
|
|
*/
|
|
int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
|
|
int *alloc_down)
|
|
{
|
|
if (!tb_tunnel_is_active(tunnel))
|
|
return -EINVAL;
|
|
|
|
if (tunnel->alloc_bandwidth)
|
|
return tunnel->alloc_bandwidth(tunnel, alloc_up, alloc_down);
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
const char *tb_tunnel_type_name(const struct tb_tunnel *tunnel)
|
|
{
|
|
return tb_tunnel_names[tunnel->type];
|
|
}
|