471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
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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 <linux/delay.h>
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#include <linux/platform_data/x86/apple.h>
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#include "tb.h"
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#include "tb_regs.h"
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#include "tunnel_pci.h"
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/**
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* struct tb_cm - Simple Thunderbolt connection manager
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* @tunnel_list: List of active tunnels
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* @hotplug_active: tb_handle_hotplug will stop progressing plug
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* events and exit if this is not set (it needs to
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* acquire the lock one more time). Used to drain wq
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* after cfg has been paused.
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*/
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struct tb_cm {
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struct list_head tunnel_list;
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bool hotplug_active;
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};
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/* enumeration & hot plug handling */
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static void tb_scan_port(struct tb_port *port);
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/**
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* tb_scan_switch() - scan for and initialize downstream switches
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*/
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static void tb_scan_switch(struct tb_switch *sw)
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{
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int i;
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for (i = 1; i <= sw->config.max_port_number; i++)
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tb_scan_port(&sw->ports[i]);
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}
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/**
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* tb_scan_port() - check for and initialize switches below port
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*/
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static void tb_scan_port(struct tb_port *port)
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{
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struct tb_switch *sw;
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if (tb_is_upstream_port(port))
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return;
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if (port->config.type != TB_TYPE_PORT)
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return;
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if (port->dual_link_port && port->link_nr)
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return; /*
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* Downstream switch is reachable through two ports.
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* Only scan on the primary port (link_nr == 0).
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*/
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if (tb_wait_for_port(port, false) <= 0)
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return;
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if (port->remote) {
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tb_port_WARN(port, "port already has a remote!\n");
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return;
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}
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sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
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tb_downstream_route(port));
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if (!sw)
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return;
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if (tb_switch_configure(sw)) {
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tb_switch_put(sw);
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return;
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}
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sw->authorized = true;
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if (tb_switch_add(sw)) {
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tb_switch_put(sw);
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return;
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}
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port->remote = tb_upstream_port(sw);
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tb_upstream_port(sw)->remote = port;
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tb_scan_switch(sw);
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}
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/**
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* tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
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*/
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static void tb_free_invalid_tunnels(struct tb *tb)
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{
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struct tb_cm *tcm = tb_priv(tb);
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struct tb_pci_tunnel *tunnel;
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struct tb_pci_tunnel *n;
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list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
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if (tb_pci_is_invalid(tunnel)) {
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tb_pci_deactivate(tunnel);
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list_del(&tunnel->list);
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tb_pci_free(tunnel);
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}
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}
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}
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/**
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* tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
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*/
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static void tb_free_unplugged_children(struct tb_switch *sw)
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{
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int i;
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for (i = 1; i <= sw->config.max_port_number; i++) {
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struct tb_port *port = &sw->ports[i];
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if (tb_is_upstream_port(port))
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continue;
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if (!port->remote)
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continue;
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if (port->remote->sw->is_unplugged) {
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tb_switch_remove(port->remote->sw);
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port->remote = NULL;
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} else {
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tb_free_unplugged_children(port->remote->sw);
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}
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}
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}
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/**
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* find_pci_up_port() - return the first PCIe up port on @sw or NULL
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*/
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static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw)
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{
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int i;
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for (i = 1; i <= sw->config.max_port_number; i++)
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if (sw->ports[i].config.type == TB_TYPE_PCIE_UP)
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return &sw->ports[i];
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return NULL;
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}
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/**
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* find_unused_down_port() - return the first inactive PCIe down port on @sw
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*/
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static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw)
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{
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int i;
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int cap;
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int res;
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int data;
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for (i = 1; i <= sw->config.max_port_number; i++) {
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if (tb_is_upstream_port(&sw->ports[i]))
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continue;
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if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN)
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continue;
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cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP);
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if (cap < 0)
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continue;
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res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1);
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if (res < 0)
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continue;
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if (data & 0x80000000)
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continue;
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return &sw->ports[i];
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}
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return NULL;
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}
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/**
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* tb_activate_pcie_devices() - scan for and activate PCIe devices
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*
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* This method is somewhat ad hoc. For now it only supports one device
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* per port and only devices at depth 1.
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*/
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static void tb_activate_pcie_devices(struct tb *tb)
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{
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int i;
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int cap;
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u32 data;
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struct tb_switch *sw;
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struct tb_port *up_port;
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struct tb_port *down_port;
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struct tb_pci_tunnel *tunnel;
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struct tb_cm *tcm = tb_priv(tb);
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/* scan for pcie devices at depth 1*/
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for (i = 1; i <= tb->root_switch->config.max_port_number; i++) {
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if (tb_is_upstream_port(&tb->root_switch->ports[i]))
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continue;
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if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT)
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continue;
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if (!tb->root_switch->ports[i].remote)
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continue;
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sw = tb->root_switch->ports[i].remote->sw;
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up_port = tb_find_pci_up_port(sw);
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if (!up_port) {
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tb_sw_info(sw, "no PCIe devices found, aborting\n");
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continue;
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}
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/* check whether port is already activated */
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cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP);
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if (cap < 0)
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continue;
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if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1))
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continue;
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if (data & 0x80000000) {
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tb_port_info(up_port,
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"PCIe port already activated, aborting\n");
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continue;
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}
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down_port = tb_find_unused_down_port(tb->root_switch);
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if (!down_port) {
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tb_port_info(up_port,
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"All PCIe down ports are occupied, aborting\n");
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continue;
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}
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tunnel = tb_pci_alloc(tb, up_port, down_port);
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if (!tunnel) {
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tb_port_info(up_port,
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"PCIe tunnel allocation failed, aborting\n");
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continue;
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}
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if (tb_pci_activate(tunnel)) {
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tb_port_info(up_port,
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"PCIe tunnel activation failed, aborting\n");
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tb_pci_free(tunnel);
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}
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list_add(&tunnel->list, &tcm->tunnel_list);
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}
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}
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/* hotplug handling */
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struct tb_hotplug_event {
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struct work_struct work;
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struct tb *tb;
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u64 route;
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u8 port;
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bool unplug;
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};
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/**
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* tb_handle_hotplug() - handle hotplug event
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*
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* Executes on tb->wq.
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*/
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static void tb_handle_hotplug(struct work_struct *work)
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{
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struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work);
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struct tb *tb = ev->tb;
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struct tb_cm *tcm = tb_priv(tb);
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struct tb_switch *sw;
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struct tb_port *port;
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mutex_lock(&tb->lock);
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if (!tcm->hotplug_active)
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goto out; /* during init, suspend or shutdown */
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sw = get_switch_at_route(tb->root_switch, ev->route);
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if (!sw) {
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tb_warn(tb,
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"hotplug event from non existent switch %llx:%x (unplug: %d)\n",
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ev->route, ev->port, ev->unplug);
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goto out;
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}
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if (ev->port > sw->config.max_port_number) {
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tb_warn(tb,
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"hotplug event from non existent port %llx:%x (unplug: %d)\n",
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ev->route, ev->port, ev->unplug);
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goto out;
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}
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port = &sw->ports[ev->port];
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if (tb_is_upstream_port(port)) {
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tb_warn(tb,
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"hotplug event for upstream port %llx:%x (unplug: %d)\n",
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ev->route, ev->port, ev->unplug);
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goto out;
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}
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if (ev->unplug) {
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if (port->remote) {
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tb_port_info(port, "unplugged\n");
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tb_sw_set_unplugged(port->remote->sw);
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tb_free_invalid_tunnels(tb);
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tb_switch_remove(port->remote->sw);
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port->remote = NULL;
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} else {
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tb_port_info(port,
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"got unplug event for disconnected port, ignoring\n");
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}
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} else if (port->remote) {
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tb_port_info(port,
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"got plug event for connected port, ignoring\n");
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} else {
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tb_port_info(port, "hotplug: scanning\n");
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tb_scan_port(port);
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if (!port->remote) {
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tb_port_info(port, "hotplug: no switch found\n");
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} else if (port->remote->sw->config.depth > 1) {
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tb_sw_warn(port->remote->sw,
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"hotplug: chaining not supported\n");
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} else {
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tb_sw_info(port->remote->sw,
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"hotplug: activating pcie devices\n");
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tb_activate_pcie_devices(tb);
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}
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}
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out:
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mutex_unlock(&tb->lock);
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kfree(ev);
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}
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/**
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* tb_schedule_hotplug_handler() - callback function for the control channel
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*
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* Delegates to tb_handle_hotplug.
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*/
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static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
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const void *buf, size_t size)
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{
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const struct cfg_event_pkg *pkg = buf;
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struct tb_hotplug_event *ev;
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u64 route;
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if (type != TB_CFG_PKG_EVENT) {
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tb_warn(tb, "unexpected event %#x, ignoring\n", type);
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return;
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}
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route = tb_cfg_get_route(&pkg->header);
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if (tb_cfg_error(tb->ctl, route, pkg->port,
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TB_CFG_ERROR_ACK_PLUG_EVENT)) {
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tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
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pkg->port);
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}
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ev = kmalloc(sizeof(*ev), GFP_KERNEL);
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if (!ev)
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return;
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INIT_WORK(&ev->work, tb_handle_hotplug);
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ev->tb = tb;
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ev->route = route;
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ev->port = pkg->port;
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ev->unplug = pkg->unplug;
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queue_work(tb->wq, &ev->work);
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}
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static void tb_stop(struct tb *tb)
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{
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struct tb_cm *tcm = tb_priv(tb);
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struct tb_pci_tunnel *tunnel;
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struct tb_pci_tunnel *n;
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/* tunnels are only present after everything has been initialized */
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list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
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tb_pci_deactivate(tunnel);
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tb_pci_free(tunnel);
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}
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tb_switch_remove(tb->root_switch);
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tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
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}
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static int tb_start(struct tb *tb)
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{
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struct tb_cm *tcm = tb_priv(tb);
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int ret;
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tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
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if (!tb->root_switch)
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return -ENOMEM;
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/*
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* ICM firmware upgrade needs running firmware and in native
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* mode that is not available so disable firmware upgrade of the
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* root switch.
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*/
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tb->root_switch->no_nvm_upgrade = true;
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ret = tb_switch_configure(tb->root_switch);
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if (ret) {
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tb_switch_put(tb->root_switch);
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return ret;
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}
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/* Announce the switch to the world */
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ret = tb_switch_add(tb->root_switch);
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if (ret) {
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tb_switch_put(tb->root_switch);
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return ret;
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}
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/* Full scan to discover devices added before the driver was loaded. */
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tb_scan_switch(tb->root_switch);
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tb_activate_pcie_devices(tb);
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/* Allow tb_handle_hotplug to progress events */
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tcm->hotplug_active = true;
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return 0;
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}
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static int tb_suspend_noirq(struct tb *tb)
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{
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struct tb_cm *tcm = tb_priv(tb);
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tb_info(tb, "suspending...\n");
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tb_switch_suspend(tb->root_switch);
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tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
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tb_info(tb, "suspend finished\n");
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return 0;
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}
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static int tb_resume_noirq(struct tb *tb)
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{
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struct tb_cm *tcm = tb_priv(tb);
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struct tb_pci_tunnel *tunnel, *n;
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tb_info(tb, "resuming...\n");
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/* remove any pci devices the firmware might have setup */
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tb_switch_reset(tb, 0);
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tb_switch_resume(tb->root_switch);
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tb_free_invalid_tunnels(tb);
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tb_free_unplugged_children(tb->root_switch);
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list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
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tb_pci_restart(tunnel);
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if (!list_empty(&tcm->tunnel_list)) {
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/*
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* the pcie links need some time to get going.
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* 100ms works for me...
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*/
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tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
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msleep(100);
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}
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/* Allow tb_handle_hotplug to progress events */
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tcm->hotplug_active = true;
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tb_info(tb, "resume finished\n");
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return 0;
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}
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static const struct tb_cm_ops tb_cm_ops = {
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.start = tb_start,
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.stop = tb_stop,
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.suspend_noirq = tb_suspend_noirq,
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.resume_noirq = tb_resume_noirq,
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.handle_event = tb_handle_event,
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};
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struct tb *tb_probe(struct tb_nhi *nhi)
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{
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struct tb_cm *tcm;
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struct tb *tb;
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if (!x86_apple_machine)
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return NULL;
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tb = tb_domain_alloc(nhi, sizeof(*tcm));
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if (!tb)
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return NULL;
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tb->security_level = TB_SECURITY_NONE;
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tb->cm_ops = &tb_cm_ops;
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tcm = tb_priv(tb);
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INIT_LIST_HEAD(&tcm->tunnel_list);
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return tb;
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}
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