Commit 93f36ade authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Generalize tunnel creation functionality 



To be able to tunnel non-PCIe traffic, separate tunnel functionality
into generic and PCIe specific parts. Rename struct tb_pci_tunnel to
tb_tunnel, and make it hold an array of paths instead of just two.
Update all the tunneling functions to take this structure as parameter.

We also move tb_pci_port_active() to switch.c (and rename it) where we
will be keeping all port and switch related functions.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 1752b9f7

drivers/thunderbolt/switch.c

+13 −0
Original line number Diff line number Diff line
@@ -599,6 +599,19 @@ static int tb_init_port(struct tb_port *port) 


}



/**

 * tb_pci_port_enable() - Enable PCIe adapter port

 * @port: PCIe port to enable

 * @enable: Enable/disable the PCIe adapter

 */

int tb_pci_port_enable(struct tb_port *port, bool enable)

{

	u32 word = enable ? TB_PCI_EN : 0x0;

	if (!port->cap_adap)

		return -ENXIO;

	return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);

}



/* switch utility functions */



static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)

drivers/thunderbolt/tb.c

+15 −15
Original line number Diff line number Diff line
@@ -91,14 +91,14 @@ static void tb_scan_port(struct tb_port *port) 
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;

	struct tb_tunnel *tunnel;

	struct tb_tunnel *n;



	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {

		if (tb_pci_is_invalid(tunnel)) {

			tb_pci_deactivate(tunnel);

		if (tb_tunnel_is_invalid(tunnel)) {

			tb_tunnel_deactivate(tunnel);

			list_del(&tunnel->list);

			tb_pci_free(tunnel);

			tb_tunnel_free(tunnel);

		}

	}

}
@@ -178,7 +178,7 @@ static void tb_activate_pcie_devices(struct tb *tb) 
	struct tb_switch *sw;

	struct tb_port *up_port;

	struct tb_port *down_port;

	struct tb_pci_tunnel *tunnel;

	struct tb_tunnel *tunnel;

	struct tb_cm *tcm = tb_priv(tb);



	/* scan for pcie devices at depth 1*/
@@ -214,17 +214,17 @@ static void tb_activate_pcie_devices(struct tb *tb) 
				     "All PCIe down ports are occupied, aborting\n");

			continue;

		}

		tunnel = tb_pci_alloc(tb, up_port, down_port);

		tunnel = tb_tunnel_alloc_pci(tb, up_port, down_port);

		if (!tunnel) {

			tb_port_info(up_port,

				     "PCIe tunnel allocation failed, aborting\n");

			continue;

		}



		if (tb_pci_activate(tunnel)) {

		if (tb_tunnel_activate(tunnel)) {

			tb_port_info(up_port,

				     "PCIe tunnel activation failed, aborting\n");

			tb_pci_free(tunnel);

			tb_tunnel_free(tunnel);

			continue;

		}
@@ -353,13 +353,13 @@ static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, 
static void tb_stop(struct tb *tb)

{

	struct tb_cm *tcm = tb_priv(tb);

	struct tb_pci_tunnel *tunnel;

	struct tb_pci_tunnel *n;

	struct tb_tunnel *tunnel;

	struct tb_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_tunnel_deactivate(tunnel);

		tb_tunnel_free(tunnel);

	}

	tb_switch_remove(tb->root_switch);

	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
@@ -418,7 +418,7 @@ static int tb_suspend_noirq(struct tb *tb) 
static int tb_resume_noirq(struct tb *tb)

{

	struct tb_cm *tcm = tb_priv(tb);

	struct tb_pci_tunnel *tunnel, *n;

	struct tb_tunnel *tunnel, *n;



	tb_dbg(tb, "resuming...\n");
@@ -429,7 +429,7 @@ static int tb_resume_noirq(struct tb *tb) 
	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);

		tb_tunnel_restart(tunnel);

	if (!list_empty(&tcm->tunnel_list)) {

		/*

		 * the pcie links need some time to get going.

drivers/thunderbolt/tb.h

+2 −0
Original line number Diff line number Diff line
@@ -457,6 +457,8 @@ int tb_port_clear_counter(struct tb_port *port, int counter); 
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);

int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);



int tb_pci_port_enable(struct tb_port *port, bool enable);



struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);

void tb_path_free(struct tb_path *path);

int tb_path_activate(struct tb_path *path);

drivers/thunderbolt/tb_regs.h

+4 −0
Original line number Diff line number Diff line
@@ -211,6 +211,10 @@ struct tb_regs_port_header { 


} __packed;



/* PCIe adapter registers */



#define TB_PCI_EN			BIT(31)



/* Hop register from TB_CFG_HOPS. 8 byte per entry. */

struct tb_regs_hop {

	/* DWORD 0 */

drivers/thunderbolt/tunnel.c

+176 −122
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Thunderbolt Cactus Ridge driver - Tunneling support

 * Thunderbolt driver - Tunneling support

 *

 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>

 * Copyright (C) 2019, Intel Corporation

 */



#include <linux/slab.h>
@@ -11,14 +12,17 @@ 
#include "tunnel.h"

#include "tb.h"



#define TB_PCI_PATH_DOWN		0

#define TB_PCI_PATH_UP			1



#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...)                   \

	do {                                                            \

		struct tb_pci_tunnel *__tunnel = (tunnel);              \

		struct tb_tunnel *__tunnel = (tunnel);                  \

		level(__tunnel->tb, "%llx:%x <-> %llx:%x (PCI): " fmt,  \

		      tb_route(__tunnel->down_port->sw),                \

		      __tunnel->down_port->port,                        \

		      tb_route(__tunnel->up_port->sw),                  \

		      __tunnel->up_port->port,                          \

		      tb_route(__tunnel->src_port->sw),                 \

		      __tunnel->src_port->port,                         \

		      tb_route(__tunnel->dst_port->sw),                 \

		      __tunnel->dst_port->port,                         \

		      ## arg);                                          \

	} while (0)
@@ -29,6 +33,38 @@ 
#define tb_tunnel_info(tunnel, fmt, arg...) \

	__TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg)



static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths)

{

	struct tb_tunnel *tunnel;



	tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);

	if (!tunnel)

		return NULL;



	tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL);

	if (!tunnel->paths) {

		tb_tunnel_free(tunnel);

		return NULL;

	}



	INIT_LIST_HEAD(&tunnel->list);

	tunnel->tb = tb;

	tunnel->npaths = npaths;



	return tunnel;

}



static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate)

{

	int res;



	res = tb_pci_port_enable(tunnel->src_port, activate);

	if (res)

		return res;



	return tb_pci_port_enable(tunnel->dst_port, activate);

}



static void tb_pci_init_path(struct tb_path *path)

{

	path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
@@ -42,7 +78,10 @@ static void tb_pci_init_path(struct tb_path *path) 
}



/**

 * tb_pci_alloc() - allocate a pci tunnel

 * tb_tunnel_alloc_pci() - allocate a pci tunnel

 * @tb: Pointer to the domain structure

 * @up: PCIe upstream adapter port

 * @down: PCIe downstream adapter port

 *

 * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and

 * TB_TYPE_PCIE_DOWN.
@@ -54,170 +93,185 @@ static void tb_pci_init_path(struct tb_path *path) 
 * my thunderbolt devices). Therefore at most ONE path per device may be

 * activated.

 *

 * Return: Returns a tb_pci_tunnel on success or NULL on failure.

 * Return: Returns a tb_tunnel on success or NULL on failure.

 */

struct tb_pci_tunnel *tb_pci_alloc(struct tb *tb, struct tb_port *up,

struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,

				      struct tb_port *down)

{

	struct tb_pci_tunnel *tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);

	struct tb_path *path_to_up;

	struct tb_path *path_to_down;

	struct tb_tunnel *tunnel;



	tunnel = tb_tunnel_alloc(tb, 2);

	if (!tunnel)

		goto err;

	tunnel->tb = tb;

	tunnel->down_port = down;

	tunnel->up_port = up;

	INIT_LIST_HEAD(&tunnel->list);

	tunnel->path_to_up = tb_path_alloc(up->sw->tb, 2);

	if (!tunnel->path_to_up)

		goto err;

	tunnel->path_to_down = tb_path_alloc(up->sw->tb, 2);

	if (!tunnel->path_to_down)

		goto err;

	tb_pci_init_path(tunnel->path_to_up);

	tb_pci_init_path(tunnel->path_to_down);



	tunnel->path_to_up->hops[0].in_port = down;

	tunnel->path_to_up->hops[0].in_hop_index = 8;

	tunnel->path_to_up->hops[0].in_counter_index = -1;

	tunnel->path_to_up->hops[0].out_port = tb_upstream_port(up->sw)->remote;

	tunnel->path_to_up->hops[0].next_hop_index = 8;



	tunnel->path_to_up->hops[1].in_port = tb_upstream_port(up->sw);

	tunnel->path_to_up->hops[1].in_hop_index = 8;

	tunnel->path_to_up->hops[1].in_counter_index = -1;

	tunnel->path_to_up->hops[1].out_port = up;

	tunnel->path_to_up->hops[1].next_hop_index = 8;



	tunnel->path_to_down->hops[0].in_port = up;

	tunnel->path_to_down->hops[0].in_hop_index = 8;

	tunnel->path_to_down->hops[0].in_counter_index = -1;

	tunnel->path_to_down->hops[0].out_port = tb_upstream_port(up->sw);

	tunnel->path_to_down->hops[0].next_hop_index = 8;



	tunnel->path_to_down->hops[1].in_port =

		tb_upstream_port(up->sw)->remote;

	tunnel->path_to_down->hops[1].in_hop_index = 8;

	tunnel->path_to_down->hops[1].in_counter_index = -1;

	tunnel->path_to_down->hops[1].out_port = down;

	tunnel->path_to_down->hops[1].next_hop_index = 8;

	return tunnel;

		return NULL;



err:

	if (tunnel) {

		if (tunnel->path_to_down)

			tb_path_free(tunnel->path_to_down);

		if (tunnel->path_to_up)

			tb_path_free(tunnel->path_to_up);

		kfree(tunnel);

	tunnel->activate = tb_pci_activate;

	tunnel->src_port = down;

	tunnel->dst_port = up;



	path_to_up = tb_path_alloc(tb, 2);

	if (!path_to_up) {

		tb_tunnel_free(tunnel);

		return NULL;

	}

	tunnel->paths[TB_PCI_PATH_UP] = path_to_up;



	path_to_down = tb_path_alloc(tb, 2);

	if (!path_to_down) {

		tb_tunnel_free(tunnel);

		return NULL;

	}

	tunnel->paths[TB_PCI_PATH_DOWN] = path_to_down;



	tb_pci_init_path(path_to_up);

	tb_pci_init_path(path_to_down);



	path_to_up->hops[0].in_port = down;

	path_to_up->hops[0].in_hop_index = 8;

	path_to_up->hops[0].in_counter_index = -1;

	path_to_up->hops[0].out_port = tb_upstream_port(up->sw)->remote;

	path_to_up->hops[0].next_hop_index = 8;



	path_to_up->hops[1].in_port = tb_upstream_port(up->sw);

	path_to_up->hops[1].in_hop_index = 8;

	path_to_up->hops[1].in_counter_index = -1;

	path_to_up->hops[1].out_port = up;

	path_to_up->hops[1].next_hop_index = 8;



	path_to_down->hops[0].in_port = up;

	path_to_down->hops[0].in_hop_index = 8;

	path_to_down->hops[0].in_counter_index = -1;

	path_to_down->hops[0].out_port = tb_upstream_port(up->sw);

	path_to_down->hops[0].next_hop_index = 8;



	path_to_down->hops[1].in_port = tb_upstream_port(up->sw)->remote;

	path_to_down->hops[1].in_hop_index = 8;

	path_to_down->hops[1].in_counter_index = -1;

	path_to_down->hops[1].out_port = down;

	path_to_down->hops[1].next_hop_index = 8;



	return tunnel;

}



/**

 * tb_pci_free() - free a tunnel

 * tb_tunnel_free() - free a tunnel

 * @tunnel: Tunnel to be freed

 *

 * The tunnel must have been deactivated.

 */

void tb_pci_free(struct tb_pci_tunnel *tunnel)

void tb_tunnel_free(struct tb_tunnel *tunnel)

{

	if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) {

		tb_tunnel_WARN(tunnel, "trying to free an activated tunnel\n");

	int i;



	if (!tunnel)

		return;



	for (i = 0; i < tunnel->npaths; i++) {

		if (tunnel->paths[i] && tunnel->paths[i]->activated) {

			tb_tunnel_WARN(tunnel,

				       "trying to free an activated tunnel\n");

			return;

		}

	}

	tb_path_free(tunnel->path_to_up);

	tb_path_free(tunnel->path_to_down);



	for (i = 0; i < tunnel->npaths; i++) {

		if (tunnel->paths[i])

			tb_path_free(tunnel->paths[i]);

	}



	kfree(tunnel->paths);

	kfree(tunnel);

}



/**

 * tb_pci_is_invalid - check whether an activated path is still valid

 * tb_tunnel_is_invalid - check whether an activated path is still valid

 * @tunnel: Tunnel to check

 */

bool tb_pci_is_invalid(struct tb_pci_tunnel *tunnel)

bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel)

{

	WARN_ON(!tunnel->path_to_up->activated);

	WARN_ON(!tunnel->path_to_down->activated);

	int i;



	return tb_path_is_invalid(tunnel->path_to_up)

	       || tb_path_is_invalid(tunnel->path_to_down);

	for (i = 0; i < tunnel->npaths; i++) {

		WARN_ON(!tunnel->paths[i]->activated);

		if (tb_path_is_invalid(tunnel->paths[i]))

			return true;

	}



/**

 * tb_pci_port_active() - activate/deactivate PCI capability

 *

 * Return: Returns 0 on success or an error code on failure.

 */

static int tb_pci_port_active(struct tb_port *port, bool active)

{

	u32 word = active ? 0x80000000 : 0x0;

	if (!port->cap_adap)

		return -ENXIO;

	return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);

	return false;

}



/**

 * tb_pci_restart() - activate a tunnel after a hardware reset

 * tb_tunnel_restart() - activate a tunnel after a hardware reset

 * @tunnel: Tunnel to restart

 *

 * Return: 0 on success and negative errno in case if failure

 */

int tb_pci_restart(struct tb_pci_tunnel *tunnel)

int tb_tunnel_restart(struct tb_tunnel *tunnel)

{

	int res;

	tunnel->path_to_up->activated = false;

	tunnel->path_to_down->activated = false;

	int res, i;



	tb_tunnel_info(tunnel, "activating\n");



	res = tb_path_activate(tunnel->path_to_up);

	if (res)

		goto err;

	res = tb_path_activate(tunnel->path_to_down);

	for (i = 0; i < tunnel->npaths; i++) {

		tunnel->paths[i]->activated = false;

		res = tb_path_activate(tunnel->paths[i]);

		if (res)

			goto err;

	}



	res = tb_pci_port_active(tunnel->down_port, true);

	if (tunnel->activate) {

		res = tunnel->activate(tunnel, true);

		if (res)

			goto err;

	}



	res = tb_pci_port_active(tunnel->up_port, true);

	if (res)

		goto err;

	return 0;



err:

	tb_tunnel_warn(tunnel, "activation failed\n");

	tb_pci_deactivate(tunnel);

	tb_tunnel_deactivate(tunnel);

	return res;

}



/**

 * tb_pci_activate() - activate a tunnel

 * tb_tunnel_activate() - activate a tunnel

 * @tunnel: Tunnel to activate

 *

 * Return: Returns 0 on success or an error code on failure.

 */

int tb_pci_activate(struct tb_pci_tunnel *tunnel)

int tb_tunnel_activate(struct tb_tunnel *tunnel)

{

	if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) {

	int i;



	tb_tunnel_info(tunnel, "activating\n");



	for (i = 0; i < tunnel->npaths; i++) {

		if (tunnel->paths[i]->activated) {

			tb_tunnel_WARN(tunnel,

				       "trying to activate an already activated tunnel\n");

			return -EINVAL;

		}



	return tb_pci_restart(tunnel);

	}





	return tb_tunnel_restart(tunnel);

}



/**

 * tb_pci_deactivate() - deactivate a tunnel

 * tb_tunnel_deactivate() - deactivate a tunnel

 * @tunnel: Tunnel to deactivate

 */

void tb_pci_deactivate(struct tb_pci_tunnel *tunnel)

void tb_tunnel_deactivate(struct tb_tunnel *tunnel)

{

	int i;



	tb_tunnel_info(tunnel, "deactivating\n");

	/*

	 * TODO: enable reset by writing 0x04000000 to TB_CAP_PCIE + 1 on up

	 * port. Seems to have no effect?

	 */

	tb_pci_port_active(tunnel->up_port, false);

	tb_pci_port_active(tunnel->down_port, false);

	if (tunnel->path_to_down->activated)

		tb_path_deactivate(tunnel->path_to_down);

	if (tunnel->path_to_up->activated)

		tb_path_deactivate(tunnel->path_to_up);

}



	if (tunnel->activate)

		tunnel->activate(tunnel, false);



	for (i = 0; i < tunnel->npaths; i++) {

		if (tunnel->paths[i]->activated)

			tb_path_deactivate(tunnel->paths[i]);

	}

}

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