236 lines
6.7 KiB
C
236 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt Cactus Ridge driver - path/tunnel functionality
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include "tb.h"
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static void tb_dump_hop(struct tb_port *port, struct tb_regs_hop *hop)
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{
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tb_port_info(port, " Hop through port %d to hop %d (%s)\n",
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hop->out_port, hop->next_hop,
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hop->enable ? "enabled" : "disabled");
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tb_port_info(port, " Weight: %d Priority: %d Credits: %d Drop: %d\n",
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hop->weight, hop->priority,
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hop->initial_credits, hop->drop_packages);
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tb_port_info(port, " Counter enabled: %d Counter index: %d\n",
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hop->counter_enable, hop->counter);
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tb_port_info(port, " Flow Control (In/Eg): %d/%d Shared Buffer (In/Eg): %d/%d\n",
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hop->ingress_fc, hop->egress_fc,
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hop->ingress_shared_buffer, hop->egress_shared_buffer);
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tb_port_info(port, " Unknown1: %#x Unknown2: %#x Unknown3: %#x\n",
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hop->unknown1, hop->unknown2, hop->unknown3);
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}
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/**
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* tb_path_alloc() - allocate a thunderbolt path
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*
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* Return: Returns a tb_path on success or NULL on failure.
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*/
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struct tb_path *tb_path_alloc(struct tb *tb, int num_hops)
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{
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struct tb_path *path = kzalloc(sizeof(*path), GFP_KERNEL);
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if (!path)
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return NULL;
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path->hops = kcalloc(num_hops, sizeof(*path->hops), GFP_KERNEL);
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if (!path->hops) {
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kfree(path);
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return NULL;
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}
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path->tb = tb;
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path->path_length = num_hops;
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return path;
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}
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/**
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* tb_path_free() - free a deactivated path
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*/
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void tb_path_free(struct tb_path *path)
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{
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if (path->activated) {
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tb_WARN(path->tb, "trying to free an activated path\n")
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return;
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}
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kfree(path->hops);
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kfree(path);
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}
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static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop)
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{
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int i, res;
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for (i = first_hop; i < path->path_length; i++) {
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res = tb_port_add_nfc_credits(path->hops[i].in_port,
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-path->nfc_credits);
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if (res)
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tb_port_warn(path->hops[i].in_port,
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"nfc credits deallocation failed for hop %d\n",
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i);
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}
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}
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static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop)
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{
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int i, res;
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struct tb_regs_hop hop = { };
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for (i = first_hop; i < path->path_length; i++) {
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res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
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2 * path->hops[i].in_hop_index, 2);
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if (res)
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tb_port_warn(path->hops[i].in_port,
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"hop deactivation failed for hop %d, index %d\n",
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i, path->hops[i].in_hop_index);
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}
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}
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void tb_path_deactivate(struct tb_path *path)
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{
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if (!path->activated) {
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tb_WARN(path->tb, "trying to deactivate an inactive path\n");
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return;
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}
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tb_info(path->tb,
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"deactivating path from %llx:%x to %llx:%x\n",
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tb_route(path->hops[0].in_port->sw),
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path->hops[0].in_port->port,
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tb_route(path->hops[path->path_length - 1].out_port->sw),
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path->hops[path->path_length - 1].out_port->port);
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__tb_path_deactivate_hops(path, 0);
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__tb_path_deallocate_nfc(path, 0);
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path->activated = false;
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}
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/**
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* tb_path_activate() - activate a path
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*
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* Activate a path starting with the last hop and iterating backwards. The
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* caller must fill path->hops before calling tb_path_activate().
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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int tb_path_activate(struct tb_path *path)
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{
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int i, res;
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enum tb_path_port out_mask, in_mask;
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if (path->activated) {
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tb_WARN(path->tb, "trying to activate already activated path\n");
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return -EINVAL;
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}
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tb_info(path->tb,
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"activating path from %llx:%x to %llx:%x\n",
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tb_route(path->hops[0].in_port->sw),
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path->hops[0].in_port->port,
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tb_route(path->hops[path->path_length - 1].out_port->sw),
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path->hops[path->path_length - 1].out_port->port);
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/* Clear counters. */
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for (i = path->path_length - 1; i >= 0; i--) {
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if (path->hops[i].in_counter_index == -1)
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continue;
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res = tb_port_clear_counter(path->hops[i].in_port,
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path->hops[i].in_counter_index);
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if (res)
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goto err;
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}
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/* Add non flow controlled credits. */
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for (i = path->path_length - 1; i >= 0; i--) {
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res = tb_port_add_nfc_credits(path->hops[i].in_port,
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path->nfc_credits);
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if (res) {
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__tb_path_deallocate_nfc(path, i);
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goto err;
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}
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}
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/* Activate hops. */
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for (i = path->path_length - 1; i >= 0; i--) {
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struct tb_regs_hop hop = { 0 };
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/*
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* We do (currently) not tear down paths setup by the firmeware.
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* If a firmware device is unplugged and plugged in again then
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* it can happen that we reuse some of the hops from the (now
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* defunct) firmeware path. This causes the hotplug operation to
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* fail (the pci device does not show up). Clearing the hop
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* before overwriting it fixes the problem.
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*
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* Should be removed once we discover and tear down firmeware
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* paths.
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*/
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res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
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2 * path->hops[i].in_hop_index, 2);
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if (res) {
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__tb_path_deactivate_hops(path, i);
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__tb_path_deallocate_nfc(path, 0);
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goto err;
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}
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/* dword 0 */
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hop.next_hop = path->hops[i].next_hop_index;
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hop.out_port = path->hops[i].out_port->port;
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/* TODO: figure out why these are good values */
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hop.initial_credits = (i == path->path_length - 1) ? 16 : 7;
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hop.unknown1 = 0;
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hop.enable = 1;
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/* dword 1 */
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out_mask = (i == path->path_length - 1) ?
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TB_PATH_DESTINATION : TB_PATH_INTERNAL;
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in_mask = (i == 0) ? TB_PATH_SOURCE : TB_PATH_INTERNAL;
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hop.weight = path->weight;
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hop.unknown2 = 0;
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hop.priority = path->priority;
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hop.drop_packages = path->drop_packages;
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hop.counter = path->hops[i].in_counter_index;
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hop.counter_enable = path->hops[i].in_counter_index != -1;
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hop.ingress_fc = path->ingress_fc_enable & in_mask;
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hop.egress_fc = path->egress_fc_enable & out_mask;
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hop.ingress_shared_buffer = path->ingress_shared_buffer
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& in_mask;
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hop.egress_shared_buffer = path->egress_shared_buffer
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& out_mask;
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hop.unknown3 = 0;
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tb_port_info(path->hops[i].in_port, "Writing hop %d, index %d",
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i, path->hops[i].in_hop_index);
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tb_dump_hop(path->hops[i].in_port, &hop);
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res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
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2 * path->hops[i].in_hop_index, 2);
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if (res) {
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__tb_path_deactivate_hops(path, i);
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__tb_path_deallocate_nfc(path, 0);
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goto err;
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}
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}
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path->activated = true;
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tb_info(path->tb, "path activation complete\n");
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return 0;
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err:
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tb_WARN(path->tb, "path activation failed\n");
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return res;
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}
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/**
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* tb_path_is_invalid() - check whether any ports on the path are invalid
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*
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* Return: Returns true if the path is invalid, false otherwise.
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*/
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bool tb_path_is_invalid(struct tb_path *path)
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{
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int i = 0;
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for (i = 0; i < path->path_length; i++) {
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if (path->hops[i].in_port->sw->is_unplugged)
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return true;
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if (path->hops[i].out_port->sw->is_unplugged)
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return true;
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}
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return false;
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}
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