![Mika Westerberg](/assets/img/avatar_default.png)
Now that the driver can handle every possible tunnel types there is no point to log everything as info level so turn these to happen at debug level instead. While at it remove duplicated tunnel activation log message (tb_tunnel_activate() calls tb_tunnel_restart() which print the same message) and add one missing '\n' termination. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
692 lines
17 KiB
C
692 lines
17 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/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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/* 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_DMA_PATH_OUT 0
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#define TB_DMA_PATH_IN 1
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static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA" };
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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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#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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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_activate(struct tb_tunnel *tunnel, bool activate)
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{
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int res;
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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 void tb_pci_init_path(struct tb_path *path)
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{
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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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path->nfc_credits = 0;
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path->hops[0].initial_credits = 7;
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path->hops[1].initial_credits = 16;
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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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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");
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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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tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP]);
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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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tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN]);
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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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tb_tunnel_free(tunnel);
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return NULL;
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}
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tb_pci_init_path(path);
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tunnel->paths[TB_PCI_PATH_UP] = path;
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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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tb_tunnel_free(tunnel);
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return NULL;
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}
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tb_pci_init_path(path);
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tunnel->paths[TB_PCI_PATH_DOWN] = path;
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return tunnel;
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}
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static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)
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{
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struct tb_port *out = tunnel->dst_port;
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struct tb_port *in = tunnel->src_port;
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u32 in_dp_cap, out_dp_cap;
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int ret;
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/*
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* Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for
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* newer generation hardware.
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*/
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if (in->sw->generation < 2 || out->sw->generation < 2)
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return 0;
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/* Read both DP_LOCAL_CAP registers */
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ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,
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in->cap_adap + TB_DP_LOCAL_CAP, 1);
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if (ret)
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return ret;
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ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,
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out->cap_adap + TB_DP_LOCAL_CAP, 1);
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if (ret)
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return ret;
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/* Write IN local caps to OUT remote caps */
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ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT,
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out->cap_adap + TB_DP_REMOTE_CAP, 1);
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if (ret)
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return ret;
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return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,
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in->cap_adap + TB_DP_REMOTE_CAP, 1);
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}
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static int tb_dp_activate(struct tb_tunnel *tunnel, bool active)
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{
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int ret;
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if (active) {
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struct tb_path **paths;
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int last;
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paths = tunnel->paths;
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last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1;
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tb_dp_port_set_hops(tunnel->src_port,
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paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index,
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paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index,
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paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index);
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tb_dp_port_set_hops(tunnel->dst_port,
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paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index,
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paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index,
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paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index);
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} else {
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tb_dp_port_hpd_clear(tunnel->src_port);
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tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0);
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if (tb_port_is_dpout(tunnel->dst_port))
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tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0);
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}
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ret = tb_dp_port_enable(tunnel->src_port, active);
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if (ret)
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return ret;
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if (tb_port_is_dpout(tunnel->dst_port))
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return tb_dp_port_enable(tunnel->dst_port, active);
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return 0;
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}
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static void tb_dp_init_aux_path(struct tb_path *path)
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{
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int i;
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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 = 2;
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path->weight = 1;
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for (i = 0; i < path->path_length; i++)
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path->hops[i].initial_credits = 1;
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}
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static void tb_dp_init_video_path(struct tb_path *path, bool discover)
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{
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u32 nfc_credits = path->hops[0].in_port->config.nfc_credits;
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path->egress_fc_enable = TB_PATH_NONE;
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path->egress_shared_buffer = TB_PATH_NONE;
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path->ingress_fc_enable = TB_PATH_NONE;
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path->ingress_shared_buffer = TB_PATH_NONE;
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path->priority = 1;
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path->weight = 1;
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if (discover) {
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path->nfc_credits = nfc_credits & TB_PORT_NFC_CREDITS_MASK;
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} else {
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u32 max_credits;
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max_credits = (nfc_credits & TB_PORT_MAX_CREDITS_MASK) >>
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TB_PORT_MAX_CREDITS_SHIFT;
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/* Leave some credits for AUX path */
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path->nfc_credits = min(max_credits - 2, 12U);
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}
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}
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/**
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* tb_tunnel_discover_dp() - Discover existing Display Port tunnels
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* @tb: Pointer to the domain structure
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* @in: DP in adapter
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*
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* If @in adapter is active, follows the tunnel to the DP out adapter
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* and back. Returns the discovered tunnel or %NULL if there was no
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* tunnel.
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*
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* Return: DP tunnel or %NULL if no tunnel found.
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*/
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struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
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{
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struct tb_tunnel *tunnel;
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struct tb_port *port;
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struct tb_path *path;
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if (!tb_dp_port_is_enabled(in))
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return NULL;
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tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
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if (!tunnel)
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return NULL;
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tunnel->init = tb_dp_xchg_caps;
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tunnel->activate = tb_dp_activate;
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tunnel->src_port = in;
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path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,
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&tunnel->dst_port, "Video");
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if (!path) {
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/* Just disable the DP IN port */
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tb_dp_port_enable(in, false);
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goto err_free;
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}
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tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path;
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tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], true);
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path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX");
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if (!path)
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goto err_deactivate;
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tunnel->paths[TB_DP_AUX_PATH_OUT] = path;
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tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT]);
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path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
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&port, "AUX RX");
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if (!path)
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goto err_deactivate;
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tunnel->paths[TB_DP_AUX_PATH_IN] = path;
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tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN]);
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/* Validate that the tunnel is complete */
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if (!tb_port_is_dpout(tunnel->dst_port)) {
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tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n");
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goto err_deactivate;
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}
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if (!tb_dp_port_is_enabled(tunnel->dst_port))
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goto err_deactivate;
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if (!tb_dp_port_hpd_is_active(tunnel->dst_port))
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goto err_deactivate;
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if (port != 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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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_dp() - allocate a Display Port tunnel
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* @tb: Pointer to the domain structure
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* @in: DP in adapter port
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* @out: DP out adapter port
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*
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* Allocates a tunnel between @in and @out that is capable of tunneling
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* Display Port traffic.
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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_dp(struct tb *tb, struct tb_port *in,
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struct tb_port *out)
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{
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struct tb_tunnel *tunnel;
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struct tb_path **paths;
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struct tb_path *path;
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if (WARN_ON(!in->cap_adap || !out->cap_adap))
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return NULL;
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tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
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if (!tunnel)
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return NULL;
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tunnel->init = tb_dp_xchg_caps;
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tunnel->activate = tb_dp_activate;
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tunnel->src_port = in;
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tunnel->dst_port = out;
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paths = tunnel->paths;
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path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,
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1, "Video");
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if (!path)
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goto err_free;
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tb_dp_init_video_path(path, false);
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paths[TB_DP_VIDEO_PATH_OUT] = path;
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path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
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TB_DP_AUX_TX_HOPID, 1, "AUX TX");
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if (!path)
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goto err_free;
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tb_dp_init_aux_path(path);
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paths[TB_DP_AUX_PATH_OUT] = path;
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path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,
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TB_DP_AUX_RX_HOPID, 1, "AUX RX");
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if (!path)
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goto err_free;
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tb_dp_init_aux_path(path);
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paths[TB_DP_AUX_PATH_IN] = path;
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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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static u32 tb_dma_credits(struct tb_port *nhi)
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{
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u32 max_credits;
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max_credits = (nhi->config.nfc_credits & TB_PORT_MAX_CREDITS_MASK) >>
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TB_PORT_MAX_CREDITS_SHIFT;
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return min(max_credits, 13U);
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}
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static int tb_dma_activate(struct tb_tunnel *tunnel, bool active)
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|
{
|
|
struct tb_port *nhi = tunnel->src_port;
|
|
u32 credits;
|
|
|
|
credits = active ? tb_dma_credits(nhi) : 0;
|
|
return tb_port_set_initial_credits(nhi, credits);
|
|
}
|
|
|
|
static void tb_dma_init_path(struct tb_path *path, unsigned int isb,
|
|
unsigned int efc, u32 credits)
|
|
{
|
|
int i;
|
|
|
|
path->egress_fc_enable = efc;
|
|
path->ingress_fc_enable = TB_PATH_ALL;
|
|
path->egress_shared_buffer = TB_PATH_NONE;
|
|
path->ingress_shared_buffer = isb;
|
|
path->priority = 5;
|
|
path->weight = 1;
|
|
path->clear_fc = true;
|
|
|
|
for (i = 0; i < path->path_length; i++)
|
|
path->hops[i].initial_credits = credits;
|
|
}
|
|
|
|
/**
|
|
* 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_ring: NHI ring number used to send packets towards the
|
|
* other domain
|
|
* @transmit_path: HopID used for transmitting packets
|
|
* @receive_ring: NHI ring number used to receive packets from the
|
|
* other domain
|
|
* @reveive_path: HopID used for receiving packets
|
|
*
|
|
* 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_ring,
|
|
int transmit_path, int receive_ring,
|
|
int receive_path)
|
|
{
|
|
struct tb_tunnel *tunnel;
|
|
struct tb_path *path;
|
|
u32 credits;
|
|
|
|
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_DMA);
|
|
if (!tunnel)
|
|
return NULL;
|
|
|
|
tunnel->activate = tb_dma_activate;
|
|
tunnel->src_port = nhi;
|
|
tunnel->dst_port = dst;
|
|
|
|
credits = tb_dma_credits(nhi);
|
|
|
|
path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0, "DMA RX");
|
|
if (!path) {
|
|
tb_tunnel_free(tunnel);
|
|
return NULL;
|
|
}
|
|
tb_dma_init_path(path, TB_PATH_NONE, TB_PATH_SOURCE | TB_PATH_INTERNAL,
|
|
credits);
|
|
tunnel->paths[TB_DMA_PATH_IN] = path;
|
|
|
|
path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0, "DMA TX");
|
|
if (!path) {
|
|
tb_tunnel_free(tunnel);
|
|
return NULL;
|
|
}
|
|
tb_dma_init_path(path, TB_PATH_SOURCE, TB_PATH_ALL, credits);
|
|
tunnel->paths[TB_DMA_PATH_OUT] = path;
|
|
|
|
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;
|
|
|
|
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]);
|
|
}
|
|
}
|