switch.c 39.5 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
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 * Thunderbolt driver - switch/port utility functions
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 *
 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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 * Copyright (C) 2018, Intel Corporation
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 */

#include <linux/delay.h>
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#include <linux/idr.h>
#include <linux/nvmem-provider.h>
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#include <linux/pm_runtime.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "tb.h"

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/* Switch authorization from userspace is serialized by this lock */
static DEFINE_MUTEX(switch_lock);

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/* Switch NVM support */

#define NVM_DEVID		0x05
#define NVM_VERSION		0x08
#define NVM_CSS			0x10
#define NVM_FLASH_SIZE		0x45

#define NVM_MIN_SIZE		SZ_32K
#define NVM_MAX_SIZE		SZ_512K

static DEFINE_IDA(nvm_ida);

struct nvm_auth_status {
	struct list_head list;
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	uuid_t uuid;
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	u32 status;
};

/*
 * Hold NVM authentication failure status per switch This information
 * needs to stay around even when the switch gets power cycled so we
 * keep it separately.
 */
static LIST_HEAD(nvm_auth_status_cache);
static DEFINE_MUTEX(nvm_auth_status_lock);

static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
{
	struct nvm_auth_status *st;

	list_for_each_entry(st, &nvm_auth_status_cache, list) {
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		if (uuid_equal(&st->uuid, sw->uuid))
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			return st;
	}

	return NULL;
}

static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
{
	struct nvm_auth_status *st;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);
	mutex_unlock(&nvm_auth_status_lock);

	*status = st ? st->status : 0;
}

static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
{
	struct nvm_auth_status *st;

	if (WARN_ON(!sw->uuid))
		return;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);

	if (!st) {
		st = kzalloc(sizeof(*st), GFP_KERNEL);
		if (!st)
			goto unlock;

		memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
		INIT_LIST_HEAD(&st->list);
		list_add_tail(&st->list, &nvm_auth_status_cache);
	}

	st->status = status;
unlock:
	mutex_unlock(&nvm_auth_status_lock);
}

static void nvm_clear_auth_status(const struct tb_switch *sw)
{
	struct nvm_auth_status *st;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);
	if (st) {
		list_del(&st->list);
		kfree(st);
	}
	mutex_unlock(&nvm_auth_status_lock);
}

static int nvm_validate_and_write(struct tb_switch *sw)
{
	unsigned int image_size, hdr_size;
	const u8 *buf = sw->nvm->buf;
	u16 ds_size;
	int ret;

	if (!buf)
		return -EINVAL;

	image_size = sw->nvm->buf_data_size;
	if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
		return -EINVAL;

	/*
	 * FARB pointer must point inside the image and must at least
	 * contain parts of the digital section we will be reading here.
	 */
	hdr_size = (*(u32 *)buf) & 0xffffff;
	if (hdr_size + NVM_DEVID + 2 >= image_size)
		return -EINVAL;

	/* Digital section start should be aligned to 4k page */
	if (!IS_ALIGNED(hdr_size, SZ_4K))
		return -EINVAL;

	/*
	 * Read digital section size and check that it also fits inside
	 * the image.
	 */
	ds_size = *(u16 *)(buf + hdr_size);
	if (ds_size >= image_size)
		return -EINVAL;

	if (!sw->safe_mode) {
		u16 device_id;

		/*
		 * Make sure the device ID in the image matches the one
		 * we read from the switch config space.
		 */
		device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
		if (device_id != sw->config.device_id)
			return -EINVAL;

		if (sw->generation < 3) {
			/* Write CSS headers first */
			ret = dma_port_flash_write(sw->dma_port,
				DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
				DMA_PORT_CSS_MAX_SIZE);
			if (ret)
				return ret;
		}

		/* Skip headers in the image */
		buf += hdr_size;
		image_size -= hdr_size;
	}

	return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
}

static int nvm_authenticate_host(struct tb_switch *sw)
{
	int ret;

	/*
	 * Root switch NVM upgrade requires that we disconnect the
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	 * existing paths first (in case it is not in safe mode
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	 * already).
	 */
	if (!sw->safe_mode) {
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		ret = tb_domain_disconnect_all_paths(sw->tb);
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		if (ret)
			return ret;
		/*
		 * The host controller goes away pretty soon after this if
		 * everything goes well so getting timeout is expected.
		 */
		ret = dma_port_flash_update_auth(sw->dma_port);
		return ret == -ETIMEDOUT ? 0 : ret;
	}

	/*
	 * From safe mode we can get out by just power cycling the
	 * switch.
	 */
	dma_port_power_cycle(sw->dma_port);
	return 0;
}

static int nvm_authenticate_device(struct tb_switch *sw)
{
	int ret, retries = 10;

	ret = dma_port_flash_update_auth(sw->dma_port);
	if (ret && ret != -ETIMEDOUT)
		return ret;

	/*
	 * Poll here for the authentication status. It takes some time
	 * for the device to respond (we get timeout for a while). Once
	 * we get response the device needs to be power cycled in order
	 * to the new NVM to be taken into use.
	 */
	do {
		u32 status;

		ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
		if (ret < 0 && ret != -ETIMEDOUT)
			return ret;
		if (ret > 0) {
			if (status) {
				tb_sw_warn(sw, "failed to authenticate NVM\n");
				nvm_set_auth_status(sw, status);
			}

			tb_sw_info(sw, "power cycling the switch now\n");
			dma_port_power_cycle(sw->dma_port);
			return 0;
		}

		msleep(500);
	} while (--retries);

	return -ETIMEDOUT;
}

static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
			      size_t bytes)
{
	struct tb_switch *sw = priv;
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	int ret;

	pm_runtime_get_sync(&sw->dev);
	ret = dma_port_flash_read(sw->dma_port, offset, val, bytes);
	pm_runtime_mark_last_busy(&sw->dev);
	pm_runtime_put_autosuspend(&sw->dev);
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	return ret;
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}

static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
			       size_t bytes)
{
	struct tb_switch *sw = priv;
	int ret = 0;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	/*
	 * Since writing the NVM image might require some special steps,
	 * for example when CSS headers are written, we cache the image
	 * locally here and handle the special cases when the user asks
	 * us to authenticate the image.
	 */
	if (!sw->nvm->buf) {
		sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
		if (!sw->nvm->buf) {
			ret = -ENOMEM;
			goto unlock;
		}
	}

	sw->nvm->buf_data_size = offset + bytes;
	memcpy(sw->nvm->buf + offset, val, bytes);

unlock:
	mutex_unlock(&switch_lock);

	return ret;
}

static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
					   size_t size, bool active)
{
	struct nvmem_config config;

	memset(&config, 0, sizeof(config));

	if (active) {
		config.name = "nvm_active";
		config.reg_read = tb_switch_nvm_read;
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		config.read_only = true;
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	} else {
		config.name = "nvm_non_active";
		config.reg_write = tb_switch_nvm_write;
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		config.root_only = true;
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	}

	config.id = id;
	config.stride = 4;
	config.word_size = 4;
	config.size = size;
	config.dev = &sw->dev;
	config.owner = THIS_MODULE;
	config.priv = sw;

	return nvmem_register(&config);
}

static int tb_switch_nvm_add(struct tb_switch *sw)
{
	struct nvmem_device *nvm_dev;
	struct tb_switch_nvm *nvm;
	u32 val;
	int ret;

	if (!sw->dma_port)
		return 0;

	nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
	if (!nvm)
		return -ENOMEM;

	nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);

	/*
	 * If the switch is in safe-mode the only accessible portion of
	 * the NVM is the non-active one where userspace is expected to
	 * write new functional NVM.
	 */
	if (!sw->safe_mode) {
		u32 nvm_size, hdr_size;

		ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
					  sizeof(val));
		if (ret)
			goto err_ida;

		hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
		nvm_size = (SZ_1M << (val & 7)) / 8;
		nvm_size = (nvm_size - hdr_size) / 2;

		ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
					  sizeof(val));
		if (ret)
			goto err_ida;

		nvm->major = val >> 16;
		nvm->minor = val >> 8;

		nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
		if (IS_ERR(nvm_dev)) {
			ret = PTR_ERR(nvm_dev);
			goto err_ida;
		}
		nvm->active = nvm_dev;
	}

	nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
	if (IS_ERR(nvm_dev)) {
		ret = PTR_ERR(nvm_dev);
		goto err_nvm_active;
	}
	nvm->non_active = nvm_dev;

	mutex_lock(&switch_lock);
	sw->nvm = nvm;
	mutex_unlock(&switch_lock);

	return 0;

err_nvm_active:
	if (nvm->active)
		nvmem_unregister(nvm->active);
err_ida:
	ida_simple_remove(&nvm_ida, nvm->id);
	kfree(nvm);

	return ret;
}

static void tb_switch_nvm_remove(struct tb_switch *sw)
{
	struct tb_switch_nvm *nvm;

	mutex_lock(&switch_lock);
	nvm = sw->nvm;
	sw->nvm = NULL;
	mutex_unlock(&switch_lock);

	if (!nvm)
		return;

	/* Remove authentication status in case the switch is unplugged */
	if (!nvm->authenticating)
		nvm_clear_auth_status(sw);

	nvmem_unregister(nvm->non_active);
	if (nvm->active)
		nvmem_unregister(nvm->active);
	ida_simple_remove(&nvm_ida, nvm->id);
	vfree(nvm->buf);
	kfree(nvm);
}

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/* port utility functions */

static const char *tb_port_type(struct tb_regs_port_header *port)
{
	switch (port->type >> 16) {
	case 0:
		switch ((u8) port->type) {
		case 0:
			return "Inactive";
		case 1:
			return "Port";
		case 2:
			return "NHI";
		default:
			return "unknown";
		}
	case 0x2:
		return "Ethernet";
	case 0x8:
		return "SATA";
	case 0xe:
		return "DP/HDMI";
	case 0x10:
		return "PCIe";
	case 0x20:
		return "USB";
	default:
		return "unknown";
	}
}

static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
{
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	tb_dbg(tb,
	       " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
	       port->port_number, port->vendor_id, port->device_id,
	       port->revision, port->thunderbolt_version, tb_port_type(port),
	       port->type);
	tb_dbg(tb, "  Max hop id (in/out): %d/%d\n",
	       port->max_in_hop_id, port->max_out_hop_id);
	tb_dbg(tb, "  Max counters: %d\n", port->max_counters);
	tb_dbg(tb, "  NFC Credits: %#x\n", port->nfc_credits);
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}

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/**
 * tb_port_state() - get connectedness state of a port
 *
 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
 *
 * Return: Returns an enum tb_port_state on success or an error code on failure.
 */
static int tb_port_state(struct tb_port *port)
{
	struct tb_cap_phy phy;
	int res;
	if (port->cap_phy == 0) {
		tb_port_WARN(port, "does not have a PHY\n");
		return -EINVAL;
	}
	res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
	if (res)
		return res;
	return phy.state;
}

/**
 * tb_wait_for_port() - wait for a port to become ready
 *
 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
 * wait_if_unplugged is set then we also wait if the port is in state
 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
 * switch resume). Otherwise we only wait if a device is registered but the link
 * has not yet been established.
 *
 * Return: Returns an error code on failure. Returns 0 if the port is not
 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
 * if the port is connected and in state TB_PORT_UP.
 */
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
{
	int retries = 10;
	int state;
	if (!port->cap_phy) {
		tb_port_WARN(port, "does not have PHY\n");
		return -EINVAL;
	}
	if (tb_is_upstream_port(port)) {
		tb_port_WARN(port, "is the upstream port\n");
		return -EINVAL;
	}

	while (retries--) {
		state = tb_port_state(port);
		if (state < 0)
			return state;
		if (state == TB_PORT_DISABLED) {
			tb_port_info(port, "is disabled (state: 0)\n");
			return 0;
		}
		if (state == TB_PORT_UNPLUGGED) {
			if (wait_if_unplugged) {
				/* used during resume */
				tb_port_info(port,
					     "is unplugged (state: 7), retrying...\n");
				msleep(100);
				continue;
			}
			tb_port_info(port, "is unplugged (state: 7)\n");
			return 0;
		}
		if (state == TB_PORT_UP) {
			tb_port_info(port,
				     "is connected, link is up (state: 2)\n");
			return 1;
		}

		/*
		 * After plug-in the state is TB_PORT_CONNECTING. Give it some
		 * time.
		 */
		tb_port_info(port,
			     "is connected, link is not up (state: %d), retrying...\n",
			     state);
		msleep(100);
	}
	tb_port_warn(port,
		     "failed to reach state TB_PORT_UP. Ignoring port...\n");
	return 0;
}

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/**
 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
 *
 * Change the number of NFC credits allocated to @port by @credits. To remove
 * NFC credits pass a negative amount of credits.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
	if (credits == 0)
		return 0;
	tb_port_info(port,
		     "adding %#x NFC credits (%#x -> %#x)",
		     credits,
		     port->config.nfc_credits,
		     port->config.nfc_credits + credits);
	port->config.nfc_credits += credits;
	return tb_port_write(port, &port->config.nfc_credits,
			     TB_CFG_PORT, 4, 1);
}

/**
 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
 *
 * Return: Returns 0 on success or an error code on failure.
 */
int tb_port_clear_counter(struct tb_port *port, int counter)
{
	u32 zero[3] = { 0, 0, 0 };
	tb_port_info(port, "clearing counter %d\n", counter);
	return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
}

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/**
 * tb_init_port() - initialize a port
 *
 * This is a helper method for tb_switch_alloc. Does not check or initialize
 * any downstream switches.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
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static int tb_init_port(struct tb_port *port)
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{
	int res;
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	int cap;
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	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
	if (res)
		return res;

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	/* Port 0 is the switch itself and has no PHY. */
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	if (port->config.type == TB_TYPE_PORT && port->port != 0) {
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		cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
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		if (cap > 0)
			port->cap_phy = cap;
		else
			tb_port_WARN(port, "non switch port without a PHY\n");
	}

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	tb_dump_port(port->sw->tb, &port->config);
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	/* TODO: Read dual link port, DP port and more from EEPROM. */
	return 0;

}

/* switch utility functions */

static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
{
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	tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
	       sw->vendor_id, sw->device_id, sw->revision,
	       sw->thunderbolt_version);
	tb_dbg(tb, "  Max Port Number: %d\n", sw->max_port_number);
	tb_dbg(tb, "  Config:\n");
	tb_dbg(tb,
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		"   Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
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	       sw->upstream_port_number, sw->depth,
	       (((u64) sw->route_hi) << 32) | sw->route_lo,
	       sw->enabled, sw->plug_events_delay);
	tb_dbg(tb, "   unknown1: %#x unknown4: %#x\n",
	       sw->__unknown1, sw->__unknown4);
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}

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/**
 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
 *
 * Return: Returns 0 on success or an error code on failure.
 */
int tb_switch_reset(struct tb *tb, u64 route)
{
	struct tb_cfg_result res;
	struct tb_regs_switch_header header = {
		header.route_hi = route >> 32,
		header.route_lo = route,
		header.enabled = true,
	};
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	tb_dbg(tb, "resetting switch at %llx\n", route);
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	res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
			0, 2, 2, 2);
	if (res.err)
		return res.err;
	res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
	if (res.err > 0)
		return -EIO;
	return res.err;
}

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struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
{
	u8 next_port = route; /*
			       * Routes use a stride of 8 bits,
			       * eventhough a port index has 6 bits at most.
			       * */
	if (route == 0)
		return sw;
	if (next_port > sw->config.max_port_number)
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		return NULL;
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	if (tb_is_upstream_port(&sw->ports[next_port]))
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		return NULL;
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	if (!sw->ports[next_port].remote)
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		return NULL;
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	return get_switch_at_route(sw->ports[next_port].remote->sw,
				   route >> TB_ROUTE_SHIFT);
}

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/**
 * tb_plug_events_active() - enable/disable plug events on a switch
 *
 * Also configures a sane plug_events_delay of 255ms.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
	u32 data;
	int res;

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	if (!sw->config.enabled)
		return 0;

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	sw->config.plug_events_delay = 0xff;
	res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
	if (res)
		return res;

	res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
	if (res)
		return res;

	if (active) {
		data = data & 0xFFFFFF83;
		switch (sw->config.device_id) {
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		case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
		case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
		case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
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			break;
		default:
			data |= 4;
		}
	} else {
		data = data | 0x7c;
	}
	return tb_sw_write(sw, &data, TB_CFG_SWITCH,
			   sw->cap_plug_events + 1, 1);
}

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static ssize_t authorized_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sprintf(buf, "%u\n", sw->authorized);
}

static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
{
	int ret = -EINVAL;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	if (sw->authorized)
		goto unlock;

725 726 727 728 729 730
	/*
	 * Make sure there is no PCIe rescan ongoing when a new PCIe
	 * tunnel is created. Otherwise the PCIe rescan code might find
	 * the new tunnel too early.
	 */
	pci_lock_rescan_remove();
731
	pm_runtime_get_sync(&sw->dev);
732

733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
	switch (val) {
	/* Approve switch */
	case 1:
		if (sw->key)
			ret = tb_domain_approve_switch_key(sw->tb, sw);
		else
			ret = tb_domain_approve_switch(sw->tb, sw);
		break;

	/* Challenge switch */
	case 2:
		if (sw->key)
			ret = tb_domain_challenge_switch_key(sw->tb, sw);
		break;

	default:
		break;
	}

752 753
	pm_runtime_mark_last_busy(&sw->dev);
	pm_runtime_put_autosuspend(&sw->dev);
754 755
	pci_unlock_rescan_remove();

756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
	if (!ret) {
		sw->authorized = val;
		/* Notify status change to the userspace */
		kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
	}

unlock:
	mutex_unlock(&switch_lock);
	return ret;
}

static ssize_t authorized_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct tb_switch *sw = tb_to_switch(dev);
	unsigned int val;
	ssize_t ret;

	ret = kstrtouint(buf, 0, &val);
	if (ret)
		return ret;
	if (val > 2)
		return -EINVAL;

	ret = tb_switch_set_authorized(sw, val);

	return ret ? ret : count;
}
static DEVICE_ATTR_RW(authorized);

787 788 789 790 791 792 793 794 795
static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sprintf(buf, "%u\n", sw->boot);
}
static DEVICE_ATTR_RO(boot);

796 797 798 799
static ssize_t device_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
800

801 802 803 804
	return sprintf(buf, "%#x\n", sw->device);
}
static DEVICE_ATTR_RO(device);

805 806 807 808 809 810 811 812 813
static ssize_t
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
}
static DEVICE_ATTR_RO(device_name);

814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
static ssize_t key_show(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	ssize_t ret;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	if (sw->key)
		ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
	else
		ret = sprintf(buf, "\n");

	mutex_unlock(&switch_lock);
	return ret;
}

static ssize_t key_store(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct tb_switch *sw = tb_to_switch(dev);
	u8 key[TB_SWITCH_KEY_SIZE];
	ssize_t ret = count;
838
	bool clear = false;
839

840 841 842
	if (!strcmp(buf, "\n"))
		clear = true;
	else if (hex2bin(key, buf, sizeof(key)))
843 844 845 846 847 848 849 850 851
		return -EINVAL;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	if (sw->authorized) {
		ret = -EBUSY;
	} else {
		kfree(sw->key);
852 853 854 855 856 857 858
		if (clear) {
			sw->key = NULL;
		} else {
			sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
			if (!sw->key)
				ret = -ENOMEM;
		}
859 860 861 862 863
	}

	mutex_unlock(&switch_lock);
	return ret;
}
864
static DEVICE_ATTR(key, 0600, key_show, key_store);
865

866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
static void nvm_authenticate_start(struct tb_switch *sw)
{
	struct pci_dev *root_port;

	/*
	 * During host router NVM upgrade we should not allow root port to
	 * go into D3cold because some root ports cannot trigger PME
	 * itself. To be on the safe side keep the root port in D0 during
	 * the whole upgrade process.
	 */
	root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
	if (root_port)
		pm_runtime_get_noresume(&root_port->dev);
}

static void nvm_authenticate_complete(struct tb_switch *sw)
{
	struct pci_dev *root_port;

	root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
	if (root_port)
		pm_runtime_put(&root_port->dev);
}

890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
static ssize_t nvm_authenticate_show(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	u32 status;

	nvm_get_auth_status(sw, &status);
	return sprintf(buf, "%#x\n", status);
}

static ssize_t nvm_authenticate_store(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct tb_switch *sw = tb_to_switch(dev);
	bool val;
	int ret;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	/* If NVMem devices are not yet added */
	if (!sw->nvm) {
		ret = -EAGAIN;
		goto exit_unlock;
	}

	ret = kstrtobool(buf, &val);
	if (ret)
		goto exit_unlock;

	/* Always clear the authentication status */
	nvm_clear_auth_status(sw);

	if (val) {
924 925 926 927 928 929
		if (!sw->nvm->buf) {
			ret = -EINVAL;
			goto exit_unlock;
		}

		pm_runtime_get_sync(&sw->dev);
930
		ret = nvm_validate_and_write(sw);
931 932 933
		if (ret) {
			pm_runtime_mark_last_busy(&sw->dev);
			pm_runtime_put_autosuspend(&sw->dev);
934
			goto exit_unlock;
935
		}
936 937 938

		sw->nvm->authenticating = true;

939 940 941 942 943 944
		if (!tb_route(sw)) {
			/*
			 * Keep root port from suspending as long as the
			 * NVM upgrade process is running.
			 */
			nvm_authenticate_start(sw);
945
			ret = nvm_authenticate_host(sw);
946 947 948
			if (ret)
				nvm_authenticate_complete(sw);
		} else {
949
			ret = nvm_authenticate_device(sw);
950
		}
951 952
		pm_runtime_mark_last_busy(&sw->dev);
		pm_runtime_put_autosuspend(&sw->dev);
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985
	}

exit_unlock:
	mutex_unlock(&switch_lock);

	if (ret)
		return ret;
	return count;
}
static DEVICE_ATTR_RW(nvm_authenticate);

static ssize_t nvm_version_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	int ret;

	if (mutex_lock_interruptible(&switch_lock))
		return -ERESTARTSYS;

	if (sw->safe_mode)
		ret = -ENODATA;
	else if (!sw->nvm)
		ret = -EAGAIN;
	else
		ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);

	mutex_unlock(&switch_lock);

	return ret;
}
static DEVICE_ATTR_RO(nvm_version);

986 987
static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
988
{
989
	struct tb_switch *sw = tb_to_switch(dev);
990

991 992 993 994
	return sprintf(buf, "%#x\n", sw->vendor);
}
static DEVICE_ATTR_RO(vendor);

995 996 997 998 999 1000 1001 1002 1003
static ssize_t
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
}
static DEVICE_ATTR_RO(vendor_name);

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sprintf(buf, "%pUb\n", sw->uuid);
}
static DEVICE_ATTR_RO(unique_id);

static struct attribute *switch_attrs[] = {
1014
	&dev_attr_authorized.attr,
1015
	&dev_attr_boot.attr,
1016
	&dev_attr_device.attr,
1017
	&dev_attr_device_name.attr,
1018
	&dev_attr_key.attr,
1019 1020
	&dev_attr_nvm_authenticate.attr,
	&dev_attr_nvm_version.attr,
1021
	&dev_attr_vendor.attr,
1022
	&dev_attr_vendor_name.attr,
1023 1024 1025 1026
	&dev_attr_unique_id.attr,
	NULL,
};

1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
static umode_t switch_attr_is_visible(struct kobject *kobj,
				      struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct tb_switch *sw = tb_to_switch(dev);

	if (attr == &dev_attr_key.attr) {
		if (tb_route(sw) &&
		    sw->tb->security_level == TB_SECURITY_SECURE &&
		    sw->security_level == TB_SECURITY_SECURE)
			return attr->mode;
		return 0;
1039 1040 1041 1042 1043
	} else if (attr == &dev_attr_nvm_authenticate.attr ||
		   attr == &dev_attr_nvm_version.attr) {
		if (sw->dma_port)
			return attr->mode;
		return 0;
1044 1045 1046 1047
	} else if (attr == &dev_attr_boot.attr) {
		if (tb_route(sw))
			return attr->mode;
		return 0;
1048 1049
	}

1050
	return sw->safe_mode ? 0 : attr->mode;
1051 1052
}

1053
static struct attribute_group switch_group = {
1054
	.is_visible = switch_attr_is_visible,
1055 1056
	.attrs = switch_attrs,
};
1057

1058 1059 1060 1061 1062 1063 1064 1065 1066
static const struct attribute_group *switch_groups[] = {
	&switch_group,
	NULL,
};

static void tb_switch_release(struct device *dev)
{
	struct tb_switch *sw = tb_to_switch(dev);

1067 1068
	dma_port_free(sw->dma_port);

1069
	kfree(sw->uuid);
1070 1071
	kfree(sw->device_name);
	kfree(sw->vendor_name);
1072
	kfree(sw->ports);
1073
	kfree(sw->drom);
1074
	kfree(sw->key);
1075 1076 1077
	kfree(sw);
}

1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
/*
 * Currently only need to provide the callbacks. Everything else is handled
 * in the connection manager.
 */
static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
{
	return 0;
}

static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
{
	return 0;
}

static const struct dev_pm_ops tb_switch_pm_ops = {
	SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
			   NULL)
};

1097 1098 1099
struct device_type tb_switch_type = {
	.name = "thunderbolt_device",
	.release = tb_switch_release,
1100
	.pm = &tb_switch_pm_ops,
1101 1102
};

1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
static int tb_switch_get_generation(struct tb_switch *sw)
{
	switch (sw->config.device_id) {
	case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
	case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
	case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
	case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
	case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
	case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
	case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
		return 1;

	case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
		return 2;

	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1126 1127 1128
	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
		return 3;

	default:
		/*
		 * For unknown switches assume generation to be 1 to be
		 * on the safe side.
		 */
		tb_sw_warn(sw, "unsupported switch device id %#x\n",
			   sw->config.device_id);
		return 1;
	}
}

1142
/**
1143 1144 1145 1146
 * tb_switch_alloc() - allocate a switch
 * @tb: Pointer to the owning domain
 * @parent: Parent device for this switch
 * @route: Route string for this switch
1147
 *
1148 1149 1150 1151 1152 1153
 * Allocates and initializes a switch. Will not upload configuration to
 * the switch. For that you need to call tb_switch_configure()
 * separately. The returned switch should be released by calling
 * tb_switch_put().
 *
 * Return: Pointer to the allocated switch or %NULL in case of failure
1154
 */
1155 1156
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
				  u64 route)
1157 1158
{
	int i;
1159
	int cap;
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
	struct tb_switch *sw;
	int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
	if (upstream_port < 0)
		return NULL;

	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
	if (!sw)
		return NULL;

	sw->tb = tb;
1170
	if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5))
1171 1172
		goto err_free_sw_ports;

1173
	tb_dbg(tb, "current switch config:\n");
1174 1175 1176 1177 1178 1179 1180
	tb_dump_switch(tb, &sw->config);

	/* configure switch */
	sw->config.upstream_port_number = upstream_port;
	sw->config.depth = tb_route_length(route);
	sw->config.route_lo = route;
	sw->config.route_hi = route >> 32;
1181
	sw->config.enabled = 0;
1182 1183 1184

	/* initialize ports */
	sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1185
				GFP_KERNEL);
1186
	if (!sw->ports)
1187
		goto err_free_sw_ports;
1188 1189

	for (i = 0; i <= sw->config.max_port_number; i++) {
1190 1191 1192
		/* minimum setup for tb_find_cap and tb_drom_read to work */
		sw->ports[i].sw = sw;
		sw->ports[i].port = i;
1193 1194
	}

1195 1196
	sw->generation = tb_switch_get_generation(sw);

1197
	cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1198
	if (cap < 0) {
1199
		tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1200
		goto err_free_sw_ports;
1201 1202 1203
	}
	sw->cap_plug_events = cap;

1204 1205 1206 1207
	/* Root switch is always authorized */
	if (!route)
		sw->authorized = true;

1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
	device_initialize(&sw->dev);
	sw->dev.parent = parent;
	sw->dev.bus = &tb_bus_type;
	sw->dev.type = &tb_switch_type;
	sw->dev.groups = switch_groups;
	dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));

	return sw;

err_free_sw_ports:
	kfree(sw->ports);
	kfree(sw);

	return NULL;
}

1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
/**
 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
 * @tb: Pointer to the owning domain
 * @parent: Parent device for this switch
 * @route: Route string for this switch
 *
 * This creates a switch in safe mode. This means the switch pretty much
 * lacks all capabilities except DMA configuration port before it is
 * flashed with a valid NVM firmware.
 *
 * The returned switch must be released by calling tb_switch_put().
 *
 * Return: Pointer to the allocated switch or %NULL in case of failure
 */
struct tb_switch *
tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
{
	struct tb_switch *sw;

	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
	if (!sw)
		return NULL;

	sw->tb = tb;
	sw->config.depth = tb_route_length(route);
	sw->config.route_hi = upper_32_bits(route);
	sw->config.route_lo = lower_32_bits(route);
	sw->safe_mode = true;

	device_initialize(&sw->dev);
	sw->dev.parent = parent;
	sw->dev.bus = &tb_bus_type;
	sw->dev.type = &tb_switch_type;
	sw->dev.groups = switch_groups;
	dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));

	return sw;
}

1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
/**
 * tb_switch_configure() - Uploads configuration to the switch
 * @sw: Switch to configure
 *
 * Call this function before the switch is added to the system. It will
 * upload configuration to the switch and makes it available for the
 * connection manager to use.
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_switch_configure(struct tb_switch *sw)
{
	struct tb *tb = sw->tb;
	u64 route;
	int ret;

	route = tb_route(sw);
1280 1281
	tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n",
	       route, tb_route_length(route), sw->config.upstream_port_number);
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327

	if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
		tb_sw_warn(sw, "unknown switch vendor id %#x\n",
			   sw->config.vendor_id);

	sw->config.enabled = 1;

	/* upload configuration */
	ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
	if (ret)
		return ret;

	return tb_plug_events_active(sw, true);
}

static void tb_switch_set_uuid(struct tb_switch *sw)
{
	u32 uuid[4];
	int cap;

	if (sw->uuid)
		return;

	/*
	 * The newer controllers include fused UUID as part of link
	 * controller specific registers
	 */
	cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
	if (cap > 0) {
		tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
	} else {
		/*
		 * ICM generates UUID based on UID and fills the upper
		 * two words with ones. This is not strictly following
		 * UUID format but we want to be compatible with it so
		 * we do the same here.
		 */
		uuid[0] = sw->uid & 0xffffffff;
		uuid[1] = (sw->uid >> 32) & 0xffffffff;
		uuid[2] = 0xffffffff;
		uuid[3] = 0xffffffff;
	}

	sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
}

1328
static int tb_switch_add_dma_port(struct tb_switch *sw)
1329
{
1330 1331 1332
	u32 status;
	int ret;

1333 1334 1335 1336 1337 1338 1339
	switch (sw->generation) {
	case 3:
		break;

	case 2:
		/* Only root switch can be upgraded */
		if (tb_route(sw))
1340
			return 0;
1341 1342 1343
		break;

	default:
1344 1345 1346 1347 1348 1349 1350
		/*
		 * DMA port is the only thing available when the switch
		 * is in safe mode.
		 */
		if (!sw->safe_mode)
			return 0;
		break;
1351 1352
	}

1353 1354 1355
	if (sw->no_nvm_upgrade)
		return 0;

1356
	sw->dma_port = dma_port_alloc(sw);
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
	if (!sw->dma_port)
		return 0;

	/*
	 * Check status of the previous flash authentication. If there
	 * is one we need to power cycle the switch in any case to make
	 * it functional again.
	 */
	ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
	if (ret <= 0)
		return ret;

1369 1370 1371 1372
	/* Now we can allow root port to suspend again */
	if (!tb_route(sw))
		nvm_authenticate_complete(sw);

1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
	if (status) {
		tb_sw_info(sw, "switch flash authentication failed\n");
		tb_switch_set_uuid(sw);
		nvm_set_auth_status(sw, status);
	}

	tb_sw_info(sw, "power cycling the switch now\n");
	dma_port_power_cycle(sw->dma_port);

	/*
	 * We return error here which causes the switch adding failure.
	 * It should appear back after power cycle is complete.
	 */
	return -ESHUTDOWN;
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}

1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
/**
 * tb_switch_add() - Add a switch to the domain
 * @sw: Switch to add
 *
 * This is the last step in adding switch to the domain. It will read
 * identification information from DROM and initializes ports so that
 * they can be used to connect other switches. The switch will be
 * exposed to the userspace when this function successfully returns. To
 * remove and release the switch, call tb_switch_remove().
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_switch_add(struct tb_switch *sw)
{
	int i, ret;

1405 1406 1407 1408 1409 1410 1411
	/*
	 * Initialize DMA control port now before we read DROM. Recent
	 * host controllers have more complete DROM on NVM that includes
	 * vendor and model identification strings which we then expose
	 * to the userspace. NVM can be accessed through DMA
	 * configuration based mailbox.
	 */
1412 1413
	ret = tb_switch_add_dma_port(sw);
	if (ret)
1414
		return ret;
1415

1416 1417 1418 1419 1420 1421 1422
	if (!sw->safe_mode) {
		/* read drom */
		ret = tb_drom_read(sw);
		if (ret) {
			tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
			return ret;
		}
1423
		tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
1424

1425 1426 1427 1428
		tb_switch_set_uuid(sw);

		for (i = 0; i <= sw->config.max_port_number; i++) {
			if (sw->ports[i].disabled) {
1429
				tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
1430 1431 1432 1433 1434
				continue;
			}
			ret = tb_init_port(&sw->ports[i]);
			if (ret)
				return ret;
1435 1436 1437
		}
	}

1438 1439 1440 1441
	ret = device_add(&sw->dev);
	if (ret)
		return ret;

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	if (tb_route(sw)) {
		dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
			 sw->vendor, sw->device);
		if (sw->vendor_name && sw->device_name)
			dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
				 sw->device_name);
	}

1450
	ret = tb_switch_nvm_add(sw);
1451
	if (ret) {
1452
		device_del(&sw->dev);
1453 1454
		return ret;
	}
1455

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	pm_runtime_set_active(&sw->dev);
	if (sw->rpm) {
		pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
		pm_runtime_use_autosuspend(&sw->dev);
		pm_runtime_mark_last_busy(&sw->dev);
		pm_runtime_enable(&sw->dev);
		pm_request_autosuspend(&sw->dev);
	}

	return 0;
1466
}
1467

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/**
 * tb_switch_remove() - Remove and release a switch
 * @sw: Switch to remove
 *
 * This will remove the switch from the domain and release it after last
 * reference count drops to zero. If there are switches connected below
 * this switch, they will be removed as well.
 */
void tb_switch_remove(struct tb_switch *sw)
{
	int i;
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	if (sw->rpm) {
		pm_runtime_get_sync(&sw->dev);
		pm_runtime_disable(&sw->dev);
	}

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	/* port 0 is the switch itself and never has a remote */
	for (i = 1; i <= sw->config.max_port_number; i++) {
		if (tb_is_upstream_port(&sw->ports[i]))
			continue;
		if (sw->ports[i].remote)
			tb_switch_remove(sw->ports[i].remote->sw);
		sw->ports[i].remote = NULL;
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		if (sw->ports[i].xdomain)
			tb_xdomain_remove(sw->ports[i].xdomain);
		sw->ports[i].xdomain = NULL;
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	}

	if (!sw->is_unplugged)
		tb_plug_events_active(sw, false);

1500
	tb_switch_nvm_remove(sw);
1501 1502 1503

	if (tb_route(sw))
		dev_info(&sw->dev, "device disconnected\n");
1504
	device_unregister(&sw->dev);
1505 1506
}

1507
/**
1508
 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1509
 */
1510
void tb_sw_set_unplugged(struct tb_switch *sw)
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
{
	int i;
	if (sw == sw->tb->root_switch) {
		tb_sw_WARN(sw, "cannot unplug root switch\n");
		return;
	}
	if (sw->is_unplugged) {
		tb_sw_WARN(sw, "is_unplugged already set\n");
		return;
	}
	sw->is_unplugged = true;
	for (i = 0; i <= sw->config.max_port_number; i++) {
		if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
1524
			tb_sw_set_unplugged(sw->ports[i].remote->sw);
1525 1526 1527
	}
}

1528 1529 1530
int tb_switch_resume(struct tb_switch *sw)
{
	int i, err;
1531
	tb_sw_dbg(sw, "resuming switch\n");
1532

1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
	/*
	 * Check for UID of the connected switches except for root
	 * switch which we assume cannot be removed.
	 */
	if (tb_route(sw)) {
		u64 uid;

		err = tb_drom_read_uid_only(sw, &uid);
		if (err) {
			tb_sw_warn(sw, "uid read failed\n");
			return err;
		}
		if (sw->uid != uid) {
			tb_sw_info(sw,
				"changed while suspended (uid %#llx -> %#llx)\n",
				sw->uid, uid);
			return -ENODEV;
		}
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
	}

	/* upload configuration */
	err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
	if (err)
		return err;

	err = tb_plug_events_active(sw, true);
	if (err)
		return err;

	/* check for surviving downstream switches */
	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 (tb_wait_for_port(port, true) <= 0
			|| tb_switch_resume(port->remote->sw)) {
			tb_port_warn(port,
				     "lost during suspend, disconnecting\n");
1573
			tb_sw_set_unplugged(port->remote->sw);
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
		}
	}
	return 0;
}

void tb_switch_suspend(struct tb_switch *sw)
{
	int i, err;
	err = tb_plug_events_active(sw, false);
	if (err)
		return;

	for (i = 1; i <= sw->config.max_port_number; i++) {
		if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
			tb_switch_suspend(sw->ports[i].remote->sw);
	}
	/*
	 * TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
	 * effect?
	 */
}
1595 1596 1597 1598 1599

struct tb_sw_lookup {
	struct tb *tb;
	u8 link;
	u8 depth;
1600
	const uuid_t *uuid;
1601
	u64 route;
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616
};

static int tb_switch_match(struct device *dev, void *data)
{
	struct tb_switch *sw = tb_to_switch(dev);
	struct tb_sw_lookup *lookup = data;

	if (!sw)
		return 0;
	if (sw->tb != lookup->tb)
		return 0;

	if (lookup->uuid)
		return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));

1617 1618 1619 1620 1621
	if (lookup->route) {
		return sw->config.route_lo == lower_32_bits(lookup->route) &&
		       sw->config.route_hi == upper_32_bits(lookup->route);
	}

1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
	/* Root switch is matched only by depth */
	if (!lookup->depth)
		return !sw->depth;

	return sw->link == lookup->link && sw->depth == lookup->depth;
}

/**
 * tb_switch_find_by_link_depth() - Find switch by link and depth
 * @tb: Domain the switch belongs
 * @link: Link number the switch is connected
 * @depth: Depth of the switch in link
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.link = link;
	lookup.depth = depth;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}

/**
1656
 * tb_switch_find_by_uuid() - Find switch by UUID
1657 1658 1659 1660 1661 1662
 * @tb: Domain the switch belongs
 * @uuid: UUID to look for
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
1663
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.uuid = uuid;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}
1678

1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
/**
 * tb_switch_find_by_route() - Find switch by route string
 * @tb: Domain the switch belongs
 * @route: Route string to look for
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	if (!route)
		return tb_switch_get(tb->root_switch);

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.route = route;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}

1706 1707 1708 1709
void tb_switch_exit(void)
{
	ida_destroy(&nvm_ida);
}