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![Lukas Wunner](/assets/img/avatar_default.png)
We're about to amend ACPI bus scan with DMI checks whether we're running on a Mac to support Apple device properties in AML. The DMI checks are performed for every single device, adding overhead for everything x86 that isn't Apple, which is the majority. Rafael and Andy therefore request to perform the DMI match only once and cache the result. Outside of ACPI various other Apple DMI checks exist and it seems reasonable to use the cached value there as well. Rafael, Andy and Darren suggest performing the DMI check in arch code and making it available with a header in include/linux/platform_data/x86/. To this end, add early_platform_quirks() to arch/x86/kernel/quirks.c to perform the DMI check and invoke it from setup_arch(). Switch over all existing Apple DMI checks, thereby fixing two deficiencies: * They are now #defined to false on non-x86 arches and can thus be optimized away if they're located in cross-arch code. * Some of them only match "Apple Inc." but not "Apple Computer, Inc.", which is used by BIOSes released between January 2006 (when the first x86 Macs started shipping) and January 2007 (when the company name changed upon introduction of the iPhone). Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Suggested-by: Darren Hart <dvhart@infradead.org> Signed-off-by: Lukas Wunner <lukas@wunner.de> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
470 lines
11 KiB
C
470 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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