233 lines
6.4 KiB
C
233 lines
6.4 KiB
C
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/*
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* Thunderbolt Cactus Ridge driver - PCIe tunnel
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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/list.h>
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#include "tunnel_pci.h"
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#include "tb.h"
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#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \
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do { \
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struct tb_pci_tunnel *__tunnel = (tunnel); \
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level(__tunnel->tb, "%llx:%x <-> %llx:%x (PCI): " fmt, \
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tb_route(__tunnel->down_port->sw), \
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__tunnel->down_port->port, \
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tb_route(__tunnel->up_port->sw), \
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__tunnel->up_port->port, \
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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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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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}
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/**
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* tb_pci_alloc() - allocate a pci tunnel
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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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* Currently only paths consisting of two hops are supported (that is the
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* ports must be on "adjacent" switches).
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*
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* The paths are hard-coded to use hop 8 (the only working hop id available on
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* my thunderbolt devices). Therefore at most ONE path per device may be
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* activated.
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*
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* Return: Returns a tb_pci_tunnel on success or NULL on failure.
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*/
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struct tb_pci_tunnel *tb_pci_alloc(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_pci_tunnel *tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
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if (!tunnel)
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goto err;
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tunnel->tb = tb;
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tunnel->down_port = down;
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tunnel->up_port = up;
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INIT_LIST_HEAD(&tunnel->list);
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tunnel->path_to_up = tb_path_alloc(up->sw->tb, 2);
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if (!tunnel->path_to_up)
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goto err;
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tunnel->path_to_down = tb_path_alloc(up->sw->tb, 2);
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if (!tunnel->path_to_down)
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goto err;
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tb_pci_init_path(tunnel->path_to_up);
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tb_pci_init_path(tunnel->path_to_down);
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tunnel->path_to_up->hops[0].in_port = down;
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tunnel->path_to_up->hops[0].in_hop_index = 8;
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tunnel->path_to_up->hops[0].in_counter_index = -1;
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tunnel->path_to_up->hops[0].out_port = tb_upstream_port(up->sw)->remote;
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tunnel->path_to_up->hops[0].next_hop_index = 8;
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tunnel->path_to_up->hops[1].in_port = tb_upstream_port(up->sw);
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tunnel->path_to_up->hops[1].in_hop_index = 8;
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tunnel->path_to_up->hops[1].in_counter_index = -1;
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tunnel->path_to_up->hops[1].out_port = up;
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tunnel->path_to_up->hops[1].next_hop_index = 8;
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tunnel->path_to_down->hops[0].in_port = up;
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tunnel->path_to_down->hops[0].in_hop_index = 8;
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tunnel->path_to_down->hops[0].in_counter_index = -1;
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tunnel->path_to_down->hops[0].out_port = tb_upstream_port(up->sw);
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tunnel->path_to_down->hops[0].next_hop_index = 8;
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tunnel->path_to_down->hops[1].in_port =
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tb_upstream_port(up->sw)->remote;
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tunnel->path_to_down->hops[1].in_hop_index = 8;
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tunnel->path_to_down->hops[1].in_counter_index = -1;
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tunnel->path_to_down->hops[1].out_port = down;
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tunnel->path_to_down->hops[1].next_hop_index = 8;
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return tunnel;
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err:
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if (tunnel) {
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if (tunnel->path_to_down)
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tb_path_free(tunnel->path_to_down);
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if (tunnel->path_to_up)
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tb_path_free(tunnel->path_to_up);
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kfree(tunnel);
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}
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return NULL;
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}
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/**
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* tb_pci_free() - free a tunnel
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*
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* The tunnel must have been deactivated.
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*/
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void tb_pci_free(struct tb_pci_tunnel *tunnel)
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{
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if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) {
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tb_tunnel_WARN(tunnel, "trying to free an activated tunnel\n");
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return;
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}
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tb_path_free(tunnel->path_to_up);
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tb_path_free(tunnel->path_to_down);
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kfree(tunnel);
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}
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/**
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* tb_pci_is_invalid - check whether an activated path is still valid
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*/
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bool tb_pci_is_invalid(struct tb_pci_tunnel *tunnel)
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{
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WARN_ON(!tunnel->path_to_up->activated);
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WARN_ON(!tunnel->path_to_down->activated);
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return tb_path_is_invalid(tunnel->path_to_up)
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|| tb_path_is_invalid(tunnel->path_to_down);
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}
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/**
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* tb_pci_port_active() - activate/deactivate PCI capability
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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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static int tb_pci_port_active(struct tb_port *port, bool active)
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{
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u32 word = active ? 0x80000000 : 0x0;
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int cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PCIE);
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if (cap <= 0) {
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tb_port_warn(port, "TB_CAP_PCIE not found: %d\n", cap);
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return cap ? cap : -ENXIO;
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}
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return tb_port_write(port, &word, TB_CFG_PORT, cap, 1);
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}
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/**
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* tb_pci_restart() - activate a tunnel after a hardware reset
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*/
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int tb_pci_restart(struct tb_pci_tunnel *tunnel)
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{
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int res;
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tunnel->path_to_up->activated = false;
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tunnel->path_to_down->activated = false;
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tb_tunnel_info(tunnel, "activating\n");
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res = tb_path_activate(tunnel->path_to_up);
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if (res)
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goto err;
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res = tb_path_activate(tunnel->path_to_down);
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if (res)
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goto err;
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res = tb_pci_port_active(tunnel->down_port, true);
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if (res)
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goto err;
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res = tb_pci_port_active(tunnel->up_port, true);
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if (res)
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goto err;
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return 0;
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err:
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tb_tunnel_warn(tunnel, "activation failed\n");
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tb_pci_deactivate(tunnel);
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return res;
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}
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/**
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* tb_pci_activate() - activate a tunnel
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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_pci_activate(struct tb_pci_tunnel *tunnel)
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{
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int res;
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if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) {
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tb_tunnel_WARN(tunnel,
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"trying to activate an already activated tunnel\n");
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return -EINVAL;
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}
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res = tb_pci_restart(tunnel);
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if (res)
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return res;
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list_add(&tunnel->list, &tunnel->tb->tunnel_list);
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return 0;
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}
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/**
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* tb_pci_deactivate() - deactivate a tunnel
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*/
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void tb_pci_deactivate(struct tb_pci_tunnel *tunnel)
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{
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tb_tunnel_info(tunnel, "deactivating\n");
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/*
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* TODO: enable reset by writing 0x04000000 to TB_CAP_PCIE + 1 on up
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* port. Seems to have no effect?
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*/
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tb_pci_port_active(tunnel->up_port, false);
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tb_pci_port_active(tunnel->down_port, false);
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if (tunnel->path_to_down->activated)
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tb_path_deactivate(tunnel->path_to_down);
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if (tunnel->path_to_up->activated)
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tb_path_deactivate(tunnel->path_to_up);
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list_del_init(&tunnel->list);
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}
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