[mirror_ubuntu-bionic-kernel.git] / drivers / thunderbolt / tb.c

/*
 * Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
 *
 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
 */

#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_data/x86/apple.h>

#include "tb.h"
#include "tb_regs.h"
#include "tunnel_pci.h"

/**
 * struct tb_cm - Simple Thunderbolt connection manager
 * @tunnel_list: List of active tunnels
 * @hotplug_active: tb_handle_hotplug will stop progressing plug
 *		    events and exit if this is not set (it needs to
 *		    acquire the lock one more time). Used to drain wq
 *		    after cfg has been paused.
 */
struct tb_cm {
	struct list_head tunnel_list;
	bool hotplug_active;
};

/* enumeration & hot plug handling */


static void tb_scan_port(struct tb_port *port);

/**
 * tb_scan_switch() - scan for and initialize downstream switches
 */
static void tb_scan_switch(struct tb_switch *sw)
{
	int i;
	for (i = 1; i <= sw->config.max_port_number; i++)
		tb_scan_port(&sw->ports[i]);
}

/**
 * tb_scan_port() - check for and initialize switches below port
 */
static void tb_scan_port(struct tb_port *port)
{
	struct tb_switch *sw;
	if (tb_is_upstream_port(port))
		return;
	if (port->config.type != TB_TYPE_PORT)
		return;
	if (port->dual_link_port && port->link_nr)
		return; /*
			 * Downstream switch is reachable through two ports.
			 * Only scan on the primary port (link_nr == 0).
			 */
	if (tb_wait_for_port(port, false) <= 0)
		return;
	if (port->remote) {
		tb_port_WARN(port, "port already has a remote!\n");
		return;
	}
	sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
			     tb_downstream_route(port));
	if (!sw)
		return;

	if (tb_switch_configure(sw)) {
		tb_switch_put(sw);
		return;
	}

	sw->authorized = true;

	if (tb_switch_add(sw)) {
		tb_switch_put(sw);
		return;
	}

	port->remote = tb_upstream_port(sw);
	tb_upstream_port(sw)->remote = port;
	tb_scan_switch(sw);
}

/**
 * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
 */
static void tb_free_invalid_tunnels(struct tb *tb)
{
	struct tb_cm *tcm = tb_priv(tb);
	struct tb_pci_tunnel *tunnel;
	struct tb_pci_tunnel *n;

	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
		if (tb_pci_is_invalid(tunnel)) {
			tb_pci_deactivate(tunnel);
			list_del(&tunnel->list);
			tb_pci_free(tunnel);
		}
	}
}

/**
 * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
 */
static void tb_free_unplugged_children(struct tb_switch *sw)
{
	int i;
	for (i = 1; i <= sw->config.max_port_number; i++) {
		struct tb_port *port = &sw->ports[i];
		if (tb_is_upstream_port(port))
			continue;
		if (!port->remote)
			continue;
		if (port->remote->sw->is_unplugged) {
			tb_switch_remove(port->remote->sw);
			port->remote = NULL;
		} else {
			tb_free_unplugged_children(port->remote->sw);
		}
	}
}


/**
 * find_pci_up_port() - return the first PCIe up port on @sw or NULL
 */
static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw)
{
	int i;
	for (i = 1; i <= sw->config.max_port_number; i++)
		if (sw->ports[i].config.type == TB_TYPE_PCIE_UP)
			return &sw->ports[i];
	return NULL;
}

/**
 * find_unused_down_port() - return the first inactive PCIe down port on @sw
 */
static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw)
{
	int i;
	int cap;
	int res;
	int data;
	for (i = 1; i <= sw->config.max_port_number; i++) {
		if (tb_is_upstream_port(&sw->ports[i]))
			continue;
		if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN)
			continue;
		cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP);
		if (cap < 0)
			continue;
		res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1);
		if (res < 0)
			continue;
		if (data & 0x80000000)
			continue;
		return &sw->ports[i];
	}
	return NULL;
}

/**
 * tb_activate_pcie_devices() - scan for and activate PCIe devices
 *
 * This method is somewhat ad hoc. For now it only supports one device
 * per port and only devices at depth 1.
 */
static void tb_activate_pcie_devices(struct tb *tb)
{
	int i;
	int cap;
	u32 data;
	struct tb_switch *sw;
	struct tb_port *up_port;
	struct tb_port *down_port;
	struct tb_pci_tunnel *tunnel;
	struct tb_cm *tcm = tb_priv(tb);

	/* scan for pcie devices at depth 1*/
	for (i = 1; i <= tb->root_switch->config.max_port_number; i++) {
		if (tb_is_upstream_port(&tb->root_switch->ports[i]))
			continue;
		if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT)
			continue;
		if (!tb->root_switch->ports[i].remote)
			continue;
		sw = tb->root_switch->ports[i].remote->sw;
		up_port = tb_find_pci_up_port(sw);
		if (!up_port) {
			tb_sw_info(sw, "no PCIe devices found, aborting\n");
			continue;
		}

		/* check whether port is already activated */
		cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP);
		if (cap < 0)
			continue;
		if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1))
			continue;
		if (data & 0x80000000) {
			tb_port_info(up_port,
				     "PCIe port already activated, aborting\n");
			continue;
		}

		down_port = tb_find_unused_down_port(tb->root_switch);
		if (!down_port) {
			tb_port_info(up_port,
				     "All PCIe down ports are occupied, aborting\n");
			continue;
		}
		tunnel = tb_pci_alloc(tb, up_port, down_port);
		if (!tunnel) {
			tb_port_info(up_port,
				     "PCIe tunnel allocation failed, aborting\n");
			continue;
		}

		if (tb_pci_activate(tunnel)) {
			tb_port_info(up_port,
				     "PCIe tunnel activation failed, aborting\n");
			tb_pci_free(tunnel);
			continue;
		}

		list_add(&tunnel->list, &tcm->tunnel_list);
	}
}

/* hotplug handling */

struct tb_hotplug_event {
	struct work_struct work;
	struct tb *tb;
	u64 route;
	u8 port;
	bool unplug;
};

/**
 * tb_handle_hotplug() - handle hotplug event
 *
 * Executes on tb->wq.
 */
static void tb_handle_hotplug(struct work_struct *work)
{
	struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work);
	struct tb *tb = ev->tb;
	struct tb_cm *tcm = tb_priv(tb);
	struct tb_switch *sw;
	struct tb_port *port;
	mutex_lock(&tb->lock);
	if (!tcm->hotplug_active)
		goto out; /* during init, suspend or shutdown */

	sw = get_switch_at_route(tb->root_switch, ev->route);
	if (!sw) {
		tb_warn(tb,
			"hotplug event from non existent switch %llx:%x (unplug: %d)\n",
			ev->route, ev->port, ev->unplug);
		goto out;
	}
	if (ev->port > sw->config.max_port_number) {
		tb_warn(tb,
			"hotplug event from non existent port %llx:%x (unplug: %d)\n",
			ev->route, ev->port, ev->unplug);
		goto out;
	}
	port = &sw->ports[ev->port];
	if (tb_is_upstream_port(port)) {
		tb_warn(tb,
			"hotplug event for upstream port %llx:%x (unplug: %d)\n",
			ev->route, ev->port, ev->unplug);
		goto out;
	}
	if (ev->unplug) {
		if (port->remote) {
			tb_port_info(port, "unplugged\n");
			tb_sw_set_unplugged(port->remote->sw);
			tb_free_invalid_tunnels(tb);
			tb_switch_remove(port->remote->sw);
			port->remote = NULL;
		} else {
			tb_port_info(port,
				     "got unplug event for disconnected port, ignoring\n");
		}
	} else if (port->remote) {
		tb_port_info(port,
			     "got plug event for connected port, ignoring\n");
	} else {
		tb_port_info(port, "hotplug: scanning\n");
		tb_scan_port(port);
		if (!port->remote) {
			tb_port_info(port, "hotplug: no switch found\n");
		} else if (port->remote->sw->config.depth > 1) {
			tb_sw_warn(port->remote->sw,
				   "hotplug: chaining not supported\n");
		} else {
			tb_sw_info(port->remote->sw,
				   "hotplug: activating pcie devices\n");
			tb_activate_pcie_devices(tb);
		}
	}
out:
	mutex_unlock(&tb->lock);
	kfree(ev);
}

/**
 * tb_schedule_hotplug_handler() - callback function for the control channel
 *
 * Delegates to tb_handle_hotplug.
 */
static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
			    const void *buf, size_t size)
{
	const struct cfg_event_pkg *pkg = buf;
	struct tb_hotplug_event *ev;
	u64 route;

	if (type != TB_CFG_PKG_EVENT) {
		tb_warn(tb, "unexpected event %#x, ignoring\n", type);
		return;
	}

	route = tb_cfg_get_route(&pkg->header);

	if (tb_cfg_error(tb->ctl, route, pkg->port,
			 TB_CFG_ERROR_ACK_PLUG_EVENT)) {
		tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
			pkg->port);
	}

	ev = kmalloc(sizeof(*ev), GFP_KERNEL);
	if (!ev)
		return;
	INIT_WORK(&ev->work, tb_handle_hotplug);
	ev->tb = tb;
	ev->route = route;
	ev->port = pkg->port;
	ev->unplug = pkg->unplug;
	queue_work(tb->wq, &ev->work);
}

static void tb_stop(struct tb *tb)
{
	struct tb_cm *tcm = tb_priv(tb);
	struct tb_pci_tunnel *tunnel;
	struct tb_pci_tunnel *n;

	/* tunnels are only present after everything has been initialized */
	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
		tb_pci_deactivate(tunnel);
		tb_pci_free(tunnel);
	}
	tb_switch_remove(tb->root_switch);
	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
}

static int tb_start(struct tb *tb)
{
	struct tb_cm *tcm = tb_priv(tb);
	int ret;

	tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
	if (!tb->root_switch)
		return -ENOMEM;

	/*
	 * ICM firmware upgrade needs running firmware and in native
	 * mode that is not available so disable firmware upgrade of the
	 * root switch.
	 */
	tb->root_switch->no_nvm_upgrade = true;

	ret = tb_switch_configure(tb->root_switch);
	if (ret) {
		tb_switch_put(tb->root_switch);
		return ret;
	}

	/* Announce the switch to the world */
	ret = tb_switch_add(tb->root_switch);
	if (ret) {
		tb_switch_put(tb->root_switch);
		return ret;
	}

	/* Full scan to discover devices added before the driver was loaded. */
	tb_scan_switch(tb->root_switch);
	tb_activate_pcie_devices(tb);

	/* Allow tb_handle_hotplug to progress events */
	tcm->hotplug_active = true;
	return 0;
}

static int tb_suspend_noirq(struct tb *tb)
{
	struct tb_cm *tcm = tb_priv(tb);

	tb_info(tb, "suspending...\n");
	tb_switch_suspend(tb->root_switch);
	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
	tb_info(tb, "suspend finished\n");

	return 0;
}

static int tb_resume_noirq(struct tb *tb)
{
	struct tb_cm *tcm = tb_priv(tb);
	struct tb_pci_tunnel *tunnel, *n;

	tb_info(tb, "resuming...\n");

	/* remove any pci devices the firmware might have setup */
	tb_switch_reset(tb, 0);

	tb_switch_resume(tb->root_switch);
	tb_free_invalid_tunnels(tb);
	tb_free_unplugged_children(tb->root_switch);
	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
		tb_pci_restart(tunnel);
	if (!list_empty(&tcm->tunnel_list)) {
		/*
		 * the pcie links need some time to get going.
		 * 100ms works for me...
		 */
		tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
		msleep(100);
	}
	 /* Allow tb_handle_hotplug to progress events */
	tcm->hotplug_active = true;
	tb_info(tb, "resume finished\n");

	return 0;
}

static const struct tb_cm_ops tb_cm_ops = {
	.start = tb_start,
	.stop = tb_stop,
	.suspend_noirq = tb_suspend_noirq,
	.resume_noirq = tb_resume_noirq,
	.handle_event = tb_handle_event,
};

struct tb *tb_probe(struct tb_nhi *nhi)
{
	struct tb_cm *tcm;
	struct tb *tb;

	if (!x86_apple_machine)
		return NULL;

	tb = tb_domain_alloc(nhi, sizeof(*tcm));
	if (!tb)
		return NULL;

	tb->security_level = TB_SECURITY_NONE;
	tb->cm_ops = &tb_cm_ops;

	tcm = tb_priv(tb);
	INIT_LIST_HEAD(&tcm->tunnel_list);

	return tb;
}
Commit	Line	Data
d6cc51cd AN	1	/*
	2	* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
	3	*
	4	* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
	5	*/
	6
	7	#include <linux/slab.h>
	8	#include <linux/errno.h>
	9	#include <linux/delay.h>
630b3aff	10	#include <linux/platform_data/x86/apple.h>
d6cc51cd AN	11
d6cc51cd AN	12	#include "tb.h"
7adf6097	13	#include "tb_regs.h"
3364f0c1	14	#include "tunnel_pci.h"
d6cc51cd	15
9d3cce0b MW	16	/**
	17	* struct tb_cm - Simple Thunderbolt connection manager
	18	* @tunnel_list: List of active tunnels
	19	* @hotplug_active: tb_handle_hotplug will stop progressing plug
	20	* events and exit if this is not set (it needs to
	21	* acquire the lock one more time). Used to drain wq
	22	* after cfg has been paused.
	23	*/
	24	struct tb_cm {
	25	struct list_head tunnel_list;
	26	bool hotplug_active;
	27	};
9da672a4 AN	28
	29	/* enumeration & hot plug handling */
	30
	31
	32	static void tb_scan_port(struct tb_port *port);
	33
	34	/**
	35	* tb_scan_switch() - scan for and initialize downstream switches
	36	*/
	37	static void tb_scan_switch(struct tb_switch *sw)
	38	{
	39	int i;
	40	for (i = 1; i <= sw->config.max_port_number; i++)
	41	tb_scan_port(&sw->ports[i]);
	42	}
	43
	44	/**
	45	* tb_scan_port() - check for and initialize switches below port
	46	*/
	47	static void tb_scan_port(struct tb_port *port)
	48	{
	49	struct tb_switch *sw;
	50	if (tb_is_upstream_port(port))
	51	return;
	52	if (port->config.type != TB_TYPE_PORT)
	53	return;
343fcb8c AN	54	if (port->dual_link_port && port->link_nr)
	55	return; /*
	56	* Downstream switch is reachable through two ports.
	57	* Only scan on the primary port (link_nr == 0).
	58	*/
9da672a4 AN	59	if (tb_wait_for_port(port, false) <= 0)
	60	return;
	61	if (port->remote) {
	62	tb_port_WARN(port, "port already has a remote!\n");
	63	return;
	64	}
bfe778ac MW	65	sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
bfe778ac MW	66	tb_downstream_route(port));
9da672a4 AN	67	if (!sw)
9da672a4 AN	68	return;
bfe778ac MW	69
	70	if (tb_switch_configure(sw)) {
	71	tb_switch_put(sw);
	72	return;
	73	}
	74
f67cf491 MW	75	sw->authorized = true;
f67cf491 MW	76
bfe778ac MW	77	if (tb_switch_add(sw)) {
	78	tb_switch_put(sw);
	79	return;
	80	}
	81
9da672a4 AN	82	port->remote = tb_upstream_port(sw);
	83	tb_upstream_port(sw)->remote = port;
	84	tb_scan_switch(sw);
	85	}
	86
3364f0c1 AN	87	/**
	88	* tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
	89	*/
	90	static void tb_free_invalid_tunnels(struct tb *tb)
	91	{
9d3cce0b	92	struct tb_cm *tcm = tb_priv(tb);
3364f0c1 AN	93	struct tb_pci_tunnel *tunnel;
3364f0c1 AN	94	struct tb_pci_tunnel *n;
9d3cce0b MW	95
9d3cce0b MW	96	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
3364f0c1 AN	97	if (tb_pci_is_invalid(tunnel)) {
3364f0c1 AN	98	tb_pci_deactivate(tunnel);
9d3cce0b	99	list_del(&tunnel->list);
3364f0c1 AN	100	tb_pci_free(tunnel);
	101	}
	102	}
	103	}
	104
23dd5bb4 AN	105	/**
	106	* tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
	107	*/
	108	static void tb_free_unplugged_children(struct tb_switch *sw)
	109	{
	110	int i;
	111	for (i = 1; i <= sw->config.max_port_number; i++) {
	112	struct tb_port *port = &sw->ports[i];
	113	if (tb_is_upstream_port(port))
	114	continue;
	115	if (!port->remote)
	116	continue;
	117	if (port->remote->sw->is_unplugged) {
bfe778ac	118	tb_switch_remove(port->remote->sw);
23dd5bb4 AN	119	port->remote = NULL;
	120	} else {
	121	tb_free_unplugged_children(port->remote->sw);
	122	}
	123	}
	124	}
	125
	126
3364f0c1 AN	127	/**
	128	* find_pci_up_port() - return the first PCIe up port on @sw or NULL
	129	*/
	130	static struct tb_port tb_find_pci_up_port(struct tb_switch sw)
	131	{
	132	int i;
	133	for (i = 1; i <= sw->config.max_port_number; i++)
	134	if (sw->ports[i].config.type == TB_TYPE_PCIE_UP)
	135	return &sw->ports[i];
	136	return NULL;
	137	}
	138
	139	/**
	140	* find_unused_down_port() - return the first inactive PCIe down port on @sw
	141	*/
	142	static struct tb_port tb_find_unused_down_port(struct tb_switch sw)
	143	{
	144	int i;
	145	int cap;
	146	int res;
	147	int data;
	148	for (i = 1; i <= sw->config.max_port_number; i++) {
	149	if (tb_is_upstream_port(&sw->ports[i]))
	150	continue;
	151	if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN)
	152	continue;
da2da04b MW	153	cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP);
da2da04b MW	154	if (cap < 0)
3364f0c1 AN	155	continue;
	156	res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1);
	157	if (res < 0)
	158	continue;
	159	if (data & 0x80000000)
	160	continue;
	161	return &sw->ports[i];
	162	}
	163	return NULL;
	164	}
	165
	166	/**
	167	* tb_activate_pcie_devices() - scan for and activate PCIe devices
	168	*
	169	* This method is somewhat ad hoc. For now it only supports one device
	170	* per port and only devices at depth 1.
	171	*/
	172	static void tb_activate_pcie_devices(struct tb *tb)
	173	{
	174	int i;
	175	int cap;
	176	u32 data;
	177	struct tb_switch *sw;
	178	struct tb_port *up_port;
	179	struct tb_port *down_port;
	180	struct tb_pci_tunnel *tunnel;
9d3cce0b MW	181	struct tb_cm *tcm = tb_priv(tb);
9d3cce0b MW	182
3364f0c1 AN	183	/* scan for pcie devices at depth 1*/
	184	for (i = 1; i <= tb->root_switch->config.max_port_number; i++) {
	185	if (tb_is_upstream_port(&tb->root_switch->ports[i]))
	186	continue;
	187	if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT)
	188	continue;
	189	if (!tb->root_switch->ports[i].remote)
	190	continue;
	191	sw = tb->root_switch->ports[i].remote->sw;
	192	up_port = tb_find_pci_up_port(sw);
	193	if (!up_port) {
	194	tb_sw_info(sw, "no PCIe devices found, aborting\n");
	195	continue;
	196	}
	197
	198	/* check whether port is already activated */
da2da04b MW	199	cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP);
da2da04b MW	200	if (cap < 0)
3364f0c1 AN	201	continue;
	202	if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1))
	203	continue;
	204	if (data & 0x80000000) {
	205	tb_port_info(up_port,
	206	"PCIe port already activated, aborting\n");
	207	continue;
	208	}
	209
	210	down_port = tb_find_unused_down_port(tb->root_switch);
	211	if (!down_port) {
	212	tb_port_info(up_port,
	213	"All PCIe down ports are occupied, aborting\n");
	214	continue;
	215	}
	216	tunnel = tb_pci_alloc(tb, up_port, down_port);
	217	if (!tunnel) {
	218	tb_port_info(up_port,
	219	"PCIe tunnel allocation failed, aborting\n");
	220	continue;
	221	}
	222
	223	if (tb_pci_activate(tunnel)) {
	224	tb_port_info(up_port,
	225	"PCIe tunnel activation failed, aborting\n");
	226	tb_pci_free(tunnel);
a2e37343	227	continue;
3364f0c1 AN	228	}
3364f0c1 AN	229
9d3cce0b	230	list_add(&tunnel->list, &tcm->tunnel_list);
3364f0c1 AN	231	}
3364f0c1 AN	232	}
9da672a4	233
d6cc51cd AN	234	/* hotplug handling */
	235
	236	struct tb_hotplug_event {
	237	struct work_struct work;
	238	struct tb *tb;
	239	u64 route;
	240	u8 port;
	241	bool unplug;
	242	};
	243
	244	/**
	245	* tb_handle_hotplug() - handle hotplug event
	246	*
	247	* Executes on tb->wq.
	248	*/
	249	static void tb_handle_hotplug(struct work_struct *work)
	250	{
	251	struct tb_hotplug_event ev = container_of(work, typeof(ev), work);
	252	struct tb *tb = ev->tb;
9d3cce0b	253	struct tb_cm *tcm = tb_priv(tb);
053596d9 AN	254	struct tb_switch *sw;
053596d9 AN	255	struct tb_port *port;
d6cc51cd	256	mutex_lock(&tb->lock);
9d3cce0b	257	if (!tcm->hotplug_active)
d6cc51cd AN	258	goto out; /* during init, suspend or shutdown */
d6cc51cd AN	259
053596d9 AN	260	sw = get_switch_at_route(tb->root_switch, ev->route);
	261	if (!sw) {
	262	tb_warn(tb,
	263	"hotplug event from non existent switch %llx:%x (unplug: %d)\n",
	264	ev->route, ev->port, ev->unplug);
	265	goto out;
	266	}
	267	if (ev->port > sw->config.max_port_number) {
	268	tb_warn(tb,
	269	"hotplug event from non existent port %llx:%x (unplug: %d)\n",
	270	ev->route, ev->port, ev->unplug);
	271	goto out;
	272	}
	273	port = &sw->ports[ev->port];
	274	if (tb_is_upstream_port(port)) {
	275	tb_warn(tb,
	276	"hotplug event for upstream port %llx:%x (unplug: %d)\n",
	277	ev->route, ev->port, ev->unplug);
	278	goto out;
	279	}
	280	if (ev->unplug) {
	281	if (port->remote) {
	282	tb_port_info(port, "unplugged\n");
aae20bb6	283	tb_sw_set_unplugged(port->remote->sw);
3364f0c1	284	tb_free_invalid_tunnels(tb);
bfe778ac	285	tb_switch_remove(port->remote->sw);
053596d9 AN	286	port->remote = NULL;
	287	} else {
	288	tb_port_info(port,
	289	"got unplug event for disconnected port, ignoring\n");
	290	}
	291	} else if (port->remote) {
	292	tb_port_info(port,
	293	"got plug event for connected port, ignoring\n");
	294	} else {
	295	tb_port_info(port, "hotplug: scanning\n");
	296	tb_scan_port(port);
	297	if (!port->remote) {
	298	tb_port_info(port, "hotplug: no switch found\n");
	299	} else if (port->remote->sw->config.depth > 1) {
	300	tb_sw_warn(port->remote->sw,
	301	"hotplug: chaining not supported\n");
3364f0c1 AN	302	} else {
	303	tb_sw_info(port->remote->sw,
	304	"hotplug: activating pcie devices\n");
	305	tb_activate_pcie_devices(tb);
053596d9 AN	306	}
053596d9 AN	307	}
d6cc51cd AN	308	out:
	309	mutex_unlock(&tb->lock);
	310	kfree(ev);
	311	}
	312
	313	/**
	314	* tb_schedule_hotplug_handler() - callback function for the control channel
	315	*
	316	* Delegates to tb_handle_hotplug.
	317	*/
81a54b5e MW	318	static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
81a54b5e MW	319	const void *buf, size_t size)
d6cc51cd	320	{
81a54b5e MW	321	const struct cfg_event_pkg *pkg = buf;
	322	struct tb_hotplug_event *ev;
	323	u64 route;
	324
	325	if (type != TB_CFG_PKG_EVENT) {
	326	tb_warn(tb, "unexpected event %#x, ignoring\n", type);
	327	return;
	328	}
	329
	330	route = tb_cfg_get_route(&pkg->header);
	331
	332	if (tb_cfg_error(tb->ctl, route, pkg->port,
	333	TB_CFG_ERROR_ACK_PLUG_EVENT)) {
	334	tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
	335	pkg->port);
	336	}
	337
	338	ev = kmalloc(sizeof(*ev), GFP_KERNEL);
d6cc51cd AN	339	if (!ev)
	340	return;
	341	INIT_WORK(&ev->work, tb_handle_hotplug);
	342	ev->tb = tb;
	343	ev->route = route;
81a54b5e MW	344	ev->port = pkg->port;
81a54b5e MW	345	ev->unplug = pkg->unplug;
d6cc51cd AN	346	queue_work(tb->wq, &ev->work);
	347	}
	348
9d3cce0b	349	static void tb_stop(struct tb *tb)
d6cc51cd	350	{
9d3cce0b	351	struct tb_cm *tcm = tb_priv(tb);
3364f0c1 AN	352	struct tb_pci_tunnel *tunnel;
	353	struct tb_pci_tunnel *n;
	354
3364f0c1	355	/* tunnels are only present after everything has been initialized */
9d3cce0b	356	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
3364f0c1 AN	357	tb_pci_deactivate(tunnel);
	358	tb_pci_free(tunnel);
	359	}
bfe778ac	360	tb_switch_remove(tb->root_switch);
9d3cce0b	361	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
d6cc51cd AN	362	}
d6cc51cd AN	363
9d3cce0b	364	static int tb_start(struct tb *tb)
d6cc51cd	365	{
9d3cce0b	366	struct tb_cm *tcm = tb_priv(tb);
bfe778ac	367	int ret;
d6cc51cd	368
bfe778ac	369	tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
a25c8b2f	370	if (!tb->root_switch)
9d3cce0b	371	return -ENOMEM;
a25c8b2f	372
e6b245cc MW	373	/*
	374	* ICM firmware upgrade needs running firmware and in native
	375	* mode that is not available so disable firmware upgrade of the
	376	* root switch.
	377	*/
	378	tb->root_switch->no_nvm_upgrade = true;
	379
bfe778ac MW	380	ret = tb_switch_configure(tb->root_switch);
	381	if (ret) {
	382	tb_switch_put(tb->root_switch);
	383	return ret;
	384	}
	385
	386	/* Announce the switch to the world */
	387	ret = tb_switch_add(tb->root_switch);
	388	if (ret) {
	389	tb_switch_put(tb->root_switch);
	390	return ret;
	391	}
	392
9da672a4 AN	393	/* Full scan to discover devices added before the driver was loaded. */
9da672a4 AN	394	tb_scan_switch(tb->root_switch);
3364f0c1	395	tb_activate_pcie_devices(tb);
9da672a4	396
d6cc51cd	397	/* Allow tb_handle_hotplug to progress events */
9d3cce0b MW	398	tcm->hotplug_active = true;
9d3cce0b MW	399	return 0;
d6cc51cd AN	400	}
d6cc51cd AN	401
9d3cce0b	402	static int tb_suspend_noirq(struct tb *tb)
23dd5bb4	403	{
9d3cce0b MW	404	struct tb_cm *tcm = tb_priv(tb);
9d3cce0b MW	405
23dd5bb4	406	tb_info(tb, "suspending...\n");
23dd5bb4	407	tb_switch_suspend(tb->root_switch);
9d3cce0b	408	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
23dd5bb4	409	tb_info(tb, "suspend finished\n");
9d3cce0b MW	410
9d3cce0b MW	411	return 0;
23dd5bb4 AN	412	}
23dd5bb4 AN	413
9d3cce0b	414	static int tb_resume_noirq(struct tb *tb)
23dd5bb4	415	{
9d3cce0b	416	struct tb_cm *tcm = tb_priv(tb);
23dd5bb4	417	struct tb_pci_tunnel tunnel, n;
9d3cce0b	418
23dd5bb4	419	tb_info(tb, "resuming...\n");
23dd5bb4 AN	420
	421	/* remove any pci devices the firmware might have setup */
	422	tb_switch_reset(tb, 0);
	423
	424	tb_switch_resume(tb->root_switch);
	425	tb_free_invalid_tunnels(tb);
	426	tb_free_unplugged_children(tb->root_switch);
9d3cce0b	427	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
23dd5bb4	428	tb_pci_restart(tunnel);
9d3cce0b	429	if (!list_empty(&tcm->tunnel_list)) {
23dd5bb4 AN	430	/*
	431	* the pcie links need some time to get going.
	432	* 100ms works for me...
	433	*/
	434	tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
	435	msleep(100);
	436	}
	437	/* Allow tb_handle_hotplug to progress events */
9d3cce0b	438	tcm->hotplug_active = true;
23dd5bb4	439	tb_info(tb, "resume finished\n");
9d3cce0b MW	440
	441	return 0;
	442	}
	443
	444	static const struct tb_cm_ops tb_cm_ops = {
	445	.start = tb_start,
	446	.stop = tb_stop,
	447	.suspend_noirq = tb_suspend_noirq,
	448	.resume_noirq = tb_resume_noirq,
81a54b5e	449	.handle_event = tb_handle_event,
9d3cce0b MW	450	};
	451
	452	struct tb tb_probe(struct tb_nhi nhi)
	453	{
	454	struct tb_cm *tcm;
	455	struct tb *tb;
	456
630b3aff	457	if (!x86_apple_machine)
f67cf491 MW	458	return NULL;
f67cf491 MW	459
9d3cce0b MW	460	tb = tb_domain_alloc(nhi, sizeof(*tcm));
	461	if (!tb)
	462	return NULL;
	463
f67cf491	464	tb->security_level = TB_SECURITY_NONE;
9d3cce0b MW	465	tb->cm_ops = &tb_cm_ops;
	466
	467	tcm = tb_priv(tb);
	468	INIT_LIST_HEAD(&tcm->tunnel_list);
	469
	470	return tb;
23dd5bb4	471	}