xdomain.c 39.9 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * Thunderbolt XDomain discovery protocol support
 *
 * Copyright (C) 2017, Intel Corporation
 * Authors: Michael Jamet <michael.jamet@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <linux/device.h>
#include <linux/kmod.h>
#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/utsname.h>
#include <linux/uuid.h>
#include <linux/workqueue.h>

#include "tb.h"

#define XDOMAIN_DEFAULT_TIMEOUT			5000 /* ms */
#define XDOMAIN_PROPERTIES_RETRIES		60
#define XDOMAIN_PROPERTIES_CHANGED_RETRIES	10

struct xdomain_request_work {
	struct work_struct work;
	struct tb_xdp_header *pkg;
	struct tb *tb;
};

/* Serializes access to the properties and protocol handlers below */
static DEFINE_MUTEX(xdomain_lock);

/* Properties exposed to the remote domains */
static struct tb_property_dir *xdomain_property_dir;
static u32 *xdomain_property_block;
static u32 xdomain_property_block_len;
static u32 xdomain_property_block_gen;

/* Additional protocol handlers */
static LIST_HEAD(protocol_handlers);

/* UUID for XDomain discovery protocol: b638d70e-42ff-40bb-97c2-90e2c0b2ff07 */
static const uuid_t tb_xdp_uuid =
	UUID_INIT(0xb638d70e, 0x42ff, 0x40bb,
		  0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07);

static bool tb_xdomain_match(const struct tb_cfg_request *req,
			     const struct ctl_pkg *pkg)
{
	switch (pkg->frame.eof) {
	case TB_CFG_PKG_ERROR:
		return true;

	case TB_CFG_PKG_XDOMAIN_RESP: {
		const struct tb_xdp_header *res_hdr = pkg->buffer;
		const struct tb_xdp_header *req_hdr = req->request;

		if (pkg->frame.size < req->response_size / 4)
			return false;

		/* Make sure route matches */
		if ((res_hdr->xd_hdr.route_hi & ~BIT(31)) !=
		     req_hdr->xd_hdr.route_hi)
			return false;
		if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo)
			return false;

		/* Check that the XDomain protocol matches */
		if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid))
			return false;

		return true;
	}

	default:
		return false;
	}
}

static bool tb_xdomain_copy(struct tb_cfg_request *req,
			    const struct ctl_pkg *pkg)
{
	memcpy(req->response, pkg->buffer, req->response_size);
	req->result.err = 0;
	return true;
}

static void response_ready(void *data)
{
	tb_cfg_request_put(data);
}

static int __tb_xdomain_response(struct tb_ctl *ctl, const void *response,
				 size_t size, enum tb_cfg_pkg_type type)
{
	struct tb_cfg_request *req;

	req = tb_cfg_request_alloc();
	if (!req)
		return -ENOMEM;

	req->match = tb_xdomain_match;
	req->copy = tb_xdomain_copy;
	req->request = response;
	req->request_size = size;
	req->request_type = type;

	return tb_cfg_request(ctl, req, response_ready, req);
}

/**
 * tb_xdomain_response() - Send a XDomain response message
 * @xd: XDomain to send the message
 * @response: Response to send
 * @size: Size of the response
 * @type: PDF type of the response
 *
 * This can be used to send a XDomain response message to the other
 * domain. No response for the message is expected.
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_xdomain_response(struct tb_xdomain *xd, const void *response,
			size_t size, enum tb_cfg_pkg_type type)
{
	return __tb_xdomain_response(xd->tb->ctl, response, size, type);
}
EXPORT_SYMBOL_GPL(tb_xdomain_response);

static int __tb_xdomain_request(struct tb_ctl *ctl, const void *request,
	size_t request_size, enum tb_cfg_pkg_type request_type, void *response,
	size_t response_size, enum tb_cfg_pkg_type response_type,
	unsigned int timeout_msec)
{
	struct tb_cfg_request *req;
	struct tb_cfg_result res;

	req = tb_cfg_request_alloc();
	if (!req)
		return -ENOMEM;

	req->match = tb_xdomain_match;
	req->copy = tb_xdomain_copy;
	req->request = request;
	req->request_size = request_size;
	req->request_type = request_type;
	req->response = response;
	req->response_size = response_size;
	req->response_type = response_type;

	res = tb_cfg_request_sync(ctl, req, timeout_msec);

	tb_cfg_request_put(req);

	return res.err == 1 ? -EIO : res.err;
}

/**
 * tb_xdomain_request() - Send a XDomain request
 * @xd: XDomain to send the request
 * @request: Request to send
 * @request_size: Size of the request in bytes
 * @request_type: PDF type of the request
 * @response: Response is copied here
 * @response_size: Expected size of the response in bytes
 * @response_type: Expected PDF type of the response
 * @timeout_msec: Timeout in milliseconds to wait for the response
 *
 * This function can be used to send XDomain control channel messages to
 * the other domain. The function waits until the response is received
 * or when timeout triggers. Whichever comes first.
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_xdomain_request(struct tb_xdomain *xd, const void *request,
	size_t request_size, enum tb_cfg_pkg_type request_type,
	void *response, size_t response_size,
	enum tb_cfg_pkg_type response_type, unsigned int timeout_msec)
{
	return __tb_xdomain_request(xd->tb->ctl, request, request_size,
				    request_type, response, response_size,
				    response_type, timeout_msec);
}
EXPORT_SYMBOL_GPL(tb_xdomain_request);

static inline void tb_xdp_fill_header(struct tb_xdp_header *hdr, u64 route,
	u8 sequence, enum tb_xdp_type type, size_t size)
{
	u32 length_sn;

	length_sn = (size - sizeof(hdr->xd_hdr)) / 4;
	length_sn |= (sequence << TB_XDOMAIN_SN_SHIFT) & TB_XDOMAIN_SN_MASK;

	hdr->xd_hdr.route_hi = upper_32_bits(route);
	hdr->xd_hdr.route_lo = lower_32_bits(route);
	hdr->xd_hdr.length_sn = length_sn;
	hdr->type = type;
	memcpy(&hdr->uuid, &tb_xdp_uuid, sizeof(tb_xdp_uuid));
}

static int tb_xdp_handle_error(const struct tb_xdp_header *hdr)
{
	const struct tb_xdp_error_response *error;

	if (hdr->type != ERROR_RESPONSE)
		return 0;

	error = (const struct tb_xdp_error_response *)hdr;

	switch (error->error) {
	case ERROR_UNKNOWN_PACKET:
	case ERROR_UNKNOWN_DOMAIN:
		return -EIO;
	case ERROR_NOT_SUPPORTED:
		return -ENOTSUPP;
	case ERROR_NOT_READY:
		return -EAGAIN;
	default:
		break;
	}

	return 0;
}

static int tb_xdp_error_response(struct tb_ctl *ctl, u64 route, u8 sequence,
				 enum tb_xdp_error error)
{
	struct tb_xdp_error_response res;

	memset(&res, 0, sizeof(res));
	tb_xdp_fill_header(&res.hdr, route, sequence, ERROR_RESPONSE,
			   sizeof(res));
	res.error = error;

	return __tb_xdomain_response(ctl, &res, sizeof(res),
				     TB_CFG_PKG_XDOMAIN_RESP);
}

static int tb_xdp_properties_request(struct tb_ctl *ctl, u64 route,
	const uuid_t *src_uuid, const uuid_t *dst_uuid, int retry,
	u32 **block, u32 *generation)
{
	struct tb_xdp_properties_response *res;
	struct tb_xdp_properties req;
	u16 data_len, len;
	size_t total_size;
	u32 *data = NULL;
	int ret;

	total_size = sizeof(*res) + TB_XDP_PROPERTIES_MAX_DATA_LENGTH * 4;
	res = kzalloc(total_size, GFP_KERNEL);
	if (!res)
		return -ENOMEM;

	memset(&req, 0, sizeof(req));
	tb_xdp_fill_header(&req.hdr, route, retry % 4, PROPERTIES_REQUEST,
			   sizeof(req));
	memcpy(&req.src_uuid, src_uuid, sizeof(*src_uuid));
	memcpy(&req.dst_uuid, dst_uuid, sizeof(*dst_uuid));

	len = 0;
	data_len = 0;

	do {
		ret = __tb_xdomain_request(ctl, &req, sizeof(req),
					   TB_CFG_PKG_XDOMAIN_REQ, res,
					   total_size, TB_CFG_PKG_XDOMAIN_RESP,
					   XDOMAIN_DEFAULT_TIMEOUT);
		if (ret)
			goto err;

		ret = tb_xdp_handle_error(&res->hdr);
		if (ret)
			goto err;

		/*
		 * Package length includes the whole payload without the
		 * XDomain header. Validate first that the package is at
		 * least size of the response structure.
		 */
		len = res->hdr.xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK;
		if (len < sizeof(*res) / 4) {
			ret = -EINVAL;
			goto err;
		}

		len += sizeof(res->hdr.xd_hdr) / 4;
		len -= sizeof(*res) / 4;

		if (res->offset != req.offset) {
			ret = -EINVAL;
			goto err;
		}

		/*
		 * First time allocate block that has enough space for
		 * the whole properties block.
		 */
		if (!data) {
			data_len = res->data_length;
			if (data_len > TB_XDP_PROPERTIES_MAX_LENGTH) {
				ret = -E2BIG;
				goto err;
			}

			data = kcalloc(data_len, sizeof(u32), GFP_KERNEL);
			if (!data) {
				ret = -ENOMEM;
				goto err;
			}
		}

		memcpy(data + req.offset, res->data, len * 4);
		req.offset += len;
	} while (!data_len || req.offset < data_len);

	*block = data;
	*generation = res->generation;

	kfree(res);

	return data_len;

err:
	kfree(data);
	kfree(res);

	return ret;
}

static int tb_xdp_properties_response(struct tb *tb, struct tb_ctl *ctl,
	u64 route, u8 sequence, const uuid_t *src_uuid,
	const struct tb_xdp_properties *req)
{
	struct tb_xdp_properties_response *res;
	size_t total_size;
	u16 len;
	int ret;

	/*
	 * Currently we expect all requests to be directed to us. The
	 * protocol supports forwarding, though which we might add
	 * support later on.
	 */
	if (!uuid_equal(src_uuid, &req->dst_uuid)) {
		tb_xdp_error_response(ctl, route, sequence,
				      ERROR_UNKNOWN_DOMAIN);
		return 0;
	}

	mutex_lock(&xdomain_lock);

	if (req->offset >= xdomain_property_block_len) {
		mutex_unlock(&xdomain_lock);
		return -EINVAL;
	}

	len = xdomain_property_block_len - req->offset;
	len = min_t(u16, len, TB_XDP_PROPERTIES_MAX_DATA_LENGTH);
	total_size = sizeof(*res) + len * 4;

	res = kzalloc(total_size, GFP_KERNEL);
	if (!res) {
		mutex_unlock(&xdomain_lock);
		return -ENOMEM;
	}

	tb_xdp_fill_header(&res->hdr, route, sequence, PROPERTIES_RESPONSE,
			   total_size);
	res->generation = xdomain_property_block_gen;
	res->data_length = xdomain_property_block_len;
	res->offset = req->offset;
	uuid_copy(&res->src_uuid, src_uuid);
	uuid_copy(&res->dst_uuid, &req->src_uuid);
	memcpy(res->data, &xdomain_property_block[req->offset], len * 4);

	mutex_unlock(&xdomain_lock);

	ret = __tb_xdomain_response(ctl, res, total_size,
				    TB_CFG_PKG_XDOMAIN_RESP);

	kfree(res);
	return ret;
}

static int tb_xdp_properties_changed_request(struct tb_ctl *ctl, u64 route,
					     int retry, const uuid_t *uuid)
{
	struct tb_xdp_properties_changed_response res;
	struct tb_xdp_properties_changed req;
	int ret;

	memset(&req, 0, sizeof(req));
	tb_xdp_fill_header(&req.hdr, route, retry % 4,
			   PROPERTIES_CHANGED_REQUEST, sizeof(req));
	uuid_copy(&req.src_uuid, uuid);

	memset(&res, 0, sizeof(res));
	ret = __tb_xdomain_request(ctl, &req, sizeof(req),
				   TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res),
				   TB_CFG_PKG_XDOMAIN_RESP,
				   XDOMAIN_DEFAULT_TIMEOUT);
	if (ret)
		return ret;

	return tb_xdp_handle_error(&res.hdr);
}

static int
tb_xdp_properties_changed_response(struct tb_ctl *ctl, u64 route, u8 sequence)
{
	struct tb_xdp_properties_changed_response res;

	memset(&res, 0, sizeof(res));
	tb_xdp_fill_header(&res.hdr, route, sequence,
			   PROPERTIES_CHANGED_RESPONSE, sizeof(res));
	return __tb_xdomain_response(ctl, &res, sizeof(res),
				     TB_CFG_PKG_XDOMAIN_RESP);
}

/**
 * tb_register_protocol_handler() - Register protocol handler
 * @handler: Handler to register
 *
 * This allows XDomain service drivers to hook into incoming XDomain
 * messages. After this function is called the service driver needs to
 * be able to handle calls to callback whenever a package with the
 * registered protocol is received.
 */
int tb_register_protocol_handler(struct tb_protocol_handler *handler)
{
	if (!handler->uuid || !handler->callback)
		return -EINVAL;
	if (uuid_equal(handler->uuid, &tb_xdp_uuid))
		return -EINVAL;

	mutex_lock(&xdomain_lock);
	list_add_tail(&handler->list, &protocol_handlers);
	mutex_unlock(&xdomain_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(tb_register_protocol_handler);

/**
 * tb_unregister_protocol_handler() - Unregister protocol handler
 * @handler: Handler to unregister
 *
 * Removes the previously registered protocol handler.
 */
void tb_unregister_protocol_handler(struct tb_protocol_handler *handler)
{
	mutex_lock(&xdomain_lock);
	list_del_init(&handler->list);
	mutex_unlock(&xdomain_lock);
}
EXPORT_SYMBOL_GPL(tb_unregister_protocol_handler);

static void tb_xdp_handle_request(struct work_struct *work)
{
	struct xdomain_request_work *xw = container_of(work, typeof(*xw), work);
	const struct tb_xdp_header *pkg = xw->pkg;
	const struct tb_xdomain_header *xhdr = &pkg->xd_hdr;
	struct tb *tb = xw->tb;
	struct tb_ctl *ctl = tb->ctl;
	const uuid_t *uuid;
	int ret = 0;
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	u32 sequence;
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	u64 route;

	route = ((u64)xhdr->route_hi << 32 | xhdr->route_lo) & ~BIT_ULL(63);
	sequence = xhdr->length_sn & TB_XDOMAIN_SN_MASK;
	sequence >>= TB_XDOMAIN_SN_SHIFT;

	mutex_lock(&tb->lock);
	if (tb->root_switch)
		uuid = tb->root_switch->uuid;
	else
		uuid = NULL;
	mutex_unlock(&tb->lock);

	if (!uuid) {
		tb_xdp_error_response(ctl, route, sequence, ERROR_NOT_READY);
		goto out;
	}

	switch (pkg->type) {
	case PROPERTIES_REQUEST:
		ret = tb_xdp_properties_response(tb, ctl, route, sequence, uuid,
			(const struct tb_xdp_properties *)pkg);
		break;

	case PROPERTIES_CHANGED_REQUEST: {
		const struct tb_xdp_properties_changed *xchg =
			(const struct tb_xdp_properties_changed *)pkg;
		struct tb_xdomain *xd;

		ret = tb_xdp_properties_changed_response(ctl, route, sequence);

		/*
		 * Since the properties have been changed, let's update
		 * the xdomain related to this connection as well in
		 * case there is a change in services it offers.
		 */
		xd = tb_xdomain_find_by_uuid_locked(tb, &xchg->src_uuid);
		if (xd) {
			queue_delayed_work(tb->wq, &xd->get_properties_work,
					   msecs_to_jiffies(50));
			tb_xdomain_put(xd);
		}

		break;
	}

	default:
		break;
	}

	if (ret) {
		tb_warn(tb, "failed to send XDomain response for %#x\n",
			pkg->type);
	}

out:
	kfree(xw->pkg);
	kfree(xw);
}

static void
tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr,
			size_t size)
{
	struct xdomain_request_work *xw;

	xw = kmalloc(sizeof(*xw), GFP_KERNEL);
	if (!xw)
		return;

	INIT_WORK(&xw->work, tb_xdp_handle_request);
	xw->pkg = kmemdup(hdr, size, GFP_KERNEL);
	xw->tb = tb;

	queue_work(tb->wq, &xw->work);
}

/**
 * tb_register_service_driver() - Register XDomain service driver
 * @drv: Driver to register
 *
 * Registers new service driver from @drv to the bus.
 */
int tb_register_service_driver(struct tb_service_driver *drv)
{
	drv->driver.bus = &tb_bus_type;
	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(tb_register_service_driver);

/**
 * tb_unregister_service_driver() - Unregister XDomain service driver
 * @xdrv: Driver to unregister
 *
 * Unregisters XDomain service driver from the bus.
 */
void tb_unregister_service_driver(struct tb_service_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(tb_unregister_service_driver);

static ssize_t key_show(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

	/*
	 * It should be null terminated but anything else is pretty much
	 * allowed.
	 */
	return sprintf(buf, "%*pEp\n", (int)strlen(svc->key), svc->key);
}
static DEVICE_ATTR_RO(key);

static int get_modalias(struct tb_service *svc, char *buf, size_t size)
{
	return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key,
			svc->prtcid, svc->prtcvers, svc->prtcrevs);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

	/* Full buffer size except new line and null termination */
	get_modalias(svc, buf, PAGE_SIZE - 2);
	return sprintf(buf, "%s\n", buf);
}
static DEVICE_ATTR_RO(modalias);

static ssize_t prtcid_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

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

static ssize_t prtcvers_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

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

static ssize_t prtcrevs_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

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

static ssize_t prtcstns_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);

	return sprintf(buf, "0x%08x\n", svc->prtcstns);
}
static DEVICE_ATTR_RO(prtcstns);

static struct attribute *tb_service_attrs[] = {
	&dev_attr_key.attr,
	&dev_attr_modalias.attr,
	&dev_attr_prtcid.attr,
	&dev_attr_prtcvers.attr,
	&dev_attr_prtcrevs.attr,
	&dev_attr_prtcstns.attr,
	NULL,
};

static struct attribute_group tb_service_attr_group = {
	.attrs = tb_service_attrs,
};

static const struct attribute_group *tb_service_attr_groups[] = {
	&tb_service_attr_group,
	NULL,
};

static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);
	char modalias[64];

	get_modalias(svc, modalias, sizeof(modalias));
	return add_uevent_var(env, "MODALIAS=%s", modalias);
}

static void tb_service_release(struct device *dev)
{
	struct tb_service *svc = container_of(dev, struct tb_service, dev);
	struct tb_xdomain *xd = tb_service_parent(svc);

	ida_simple_remove(&xd->service_ids, svc->id);
	kfree(svc->key);
	kfree(svc);
}

struct device_type tb_service_type = {
	.name = "thunderbolt_service",
	.groups = tb_service_attr_groups,
	.uevent = tb_service_uevent,
	.release = tb_service_release,
};
EXPORT_SYMBOL_GPL(tb_service_type);

static int remove_missing_service(struct device *dev, void *data)
{
	struct tb_xdomain *xd = data;
	struct tb_service *svc;

	svc = tb_to_service(dev);
	if (!svc)
		return 0;

	if (!tb_property_find(xd->properties, svc->key,
			      TB_PROPERTY_TYPE_DIRECTORY))
		device_unregister(dev);

	return 0;
}

static int find_service(struct device *dev, void *data)
{
	const struct tb_property *p = data;
	struct tb_service *svc;

	svc = tb_to_service(dev);
	if (!svc)
		return 0;

	return !strcmp(svc->key, p->key);
}

static int populate_service(struct tb_service *svc,
			    struct tb_property *property)
{
	struct tb_property_dir *dir = property->value.dir;
	struct tb_property *p;

	/* Fill in standard properties */
	p = tb_property_find(dir, "prtcid", TB_PROPERTY_TYPE_VALUE);
	if (p)
		svc->prtcid = p->value.immediate;
	p = tb_property_find(dir, "prtcvers", TB_PROPERTY_TYPE_VALUE);
	if (p)
		svc->prtcvers = p->value.immediate;
	p = tb_property_find(dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE);
	if (p)
		svc->prtcrevs = p->value.immediate;
	p = tb_property_find(dir, "prtcstns", TB_PROPERTY_TYPE_VALUE);
	if (p)
		svc->prtcstns = p->value.immediate;

	svc->key = kstrdup(property->key, GFP_KERNEL);
	if (!svc->key)
		return -ENOMEM;

	return 0;
}

static void enumerate_services(struct tb_xdomain *xd)
{
	struct tb_service *svc;
	struct tb_property *p;
	struct device *dev;

	/*
	 * First remove all services that are not available anymore in
	 * the updated property block.
	 */
	device_for_each_child_reverse(&xd->dev, xd, remove_missing_service);

	/* Then re-enumerate properties creating new services as we go */
	tb_property_for_each(xd->properties, p) {
		if (p->type != TB_PROPERTY_TYPE_DIRECTORY)
			continue;

		/* If the service exists already we are fine */
		dev = device_find_child(&xd->dev, p, find_service);
		if (dev) {
			put_device(dev);
			continue;
		}

		svc = kzalloc(sizeof(*svc), GFP_KERNEL);
		if (!svc)
			break;

		if (populate_service(svc, p)) {
			kfree(svc);
			break;
		}

		svc->id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL);
		svc->dev.bus = &tb_bus_type;
		svc->dev.type = &tb_service_type;
		svc->dev.parent = &xd->dev;
		dev_set_name(&svc->dev, "%s.%d", dev_name(&xd->dev), svc->id);

		if (device_register(&svc->dev)) {
			put_device(&svc->dev);
			break;
		}
	}
}

static int populate_properties(struct tb_xdomain *xd,
			       struct tb_property_dir *dir)
{
	const struct tb_property *p;

	/* Required properties */
	p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE);
	if (!p)
		return -EINVAL;
	xd->device = p->value.immediate;

	p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE);
	if (!p)
		return -EINVAL;
	xd->vendor = p->value.immediate;

	kfree(xd->device_name);
	xd->device_name = NULL;
	kfree(xd->vendor_name);
	xd->vendor_name = NULL;

	/* Optional properties */
	p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT);
	if (p)
		xd->device_name = kstrdup(p->value.text, GFP_KERNEL);
	p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT);
	if (p)
		xd->vendor_name = kstrdup(p->value.text, GFP_KERNEL);

	return 0;
}

/* Called with @xd->lock held */
static void tb_xdomain_restore_paths(struct tb_xdomain *xd)
{
	if (!xd->resume)
		return;

	xd->resume = false;
	if (xd->transmit_path) {
		dev_dbg(&xd->dev, "re-establishing DMA path\n");
		tb_domain_approve_xdomain_paths(xd->tb, xd);
	}
}

static void tb_xdomain_get_properties(struct work_struct *work)
{
	struct tb_xdomain *xd = container_of(work, typeof(*xd),
					     get_properties_work.work);
	struct tb_property_dir *dir;
	struct tb *tb = xd->tb;
	bool update = false;
	u32 *block = NULL;
	u32 gen = 0;
	int ret;

	ret = tb_xdp_properties_request(tb->ctl, xd->route, xd->local_uuid,
					xd->remote_uuid, xd->properties_retries,
					&block, &gen);
	if (ret < 0) {
		if (xd->properties_retries-- > 0) {
			queue_delayed_work(xd->tb->wq, &xd->get_properties_work,
					   msecs_to_jiffies(1000));
		} else {
			/* Give up now */
			dev_err(&xd->dev,
				"failed read XDomain properties from %pUb\n",
				xd->remote_uuid);
		}
		return;
	}

	xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES;

	mutex_lock(&xd->lock);

	/* Only accept newer generation properties */
	if (xd->properties && gen <= xd->property_block_gen) {
		/*
		 * On resume it is likely that the properties block is
		 * not changed (unless the other end added or removed
		 * services). However, we need to make sure the existing
		 * DMA paths are restored properly.
		 */
		tb_xdomain_restore_paths(xd);
		goto err_free_block;
	}

	dir = tb_property_parse_dir(block, ret);
	if (!dir) {
		dev_err(&xd->dev, "failed to parse XDomain properties\n");
		goto err_free_block;
	}

	ret = populate_properties(xd, dir);
	if (ret) {
		dev_err(&xd->dev, "missing XDomain properties in response\n");
		goto err_free_dir;
	}

	/* Release the existing one */
	if (xd->properties) {
		tb_property_free_dir(xd->properties);
		update = true;
	}

	xd->properties = dir;
	xd->property_block_gen = gen;

	tb_xdomain_restore_paths(xd);

	mutex_unlock(&xd->lock);

	kfree(block);

	/*
	 * Now the device should be ready enough so we can add it to the
	 * bus and let userspace know about it. If the device is already
	 * registered, we notify the userspace that it has changed.
	 */
	if (!update) {
		if (device_add(&xd->dev)) {
			dev_err(&xd->dev, "failed to add XDomain device\n");
			return;
		}
	} else {
		kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE);
	}

	enumerate_services(xd);
	return;

err_free_dir:
	tb_property_free_dir(dir);
err_free_block:
	kfree(block);
	mutex_unlock(&xd->lock);
}

static void tb_xdomain_properties_changed(struct work_struct *work)
{
	struct tb_xdomain *xd = container_of(work, typeof(*xd),
					     properties_changed_work.work);
	int ret;

	ret = tb_xdp_properties_changed_request(xd->tb->ctl, xd->route,
				xd->properties_changed_retries, xd->local_uuid);
	if (ret) {
		if (xd->properties_changed_retries-- > 0)
			queue_delayed_work(xd->tb->wq,
					   &xd->properties_changed_work,
					   msecs_to_jiffies(1000));
		return;
	}

	xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES;
}

static ssize_t device_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);

	return sprintf(buf, "%#x\n", xd->device);
}
static DEVICE_ATTR_RO(device);

static ssize_t
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
	int ret;

	if (mutex_lock_interruptible(&xd->lock))
		return -ERESTARTSYS;
	ret = sprintf(buf, "%s\n", xd->device_name ? xd->device_name : "");
	mutex_unlock(&xd->lock);

	return ret;
}
static DEVICE_ATTR_RO(device_name);

static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);

	return sprintf(buf, "%#x\n", xd->vendor);
}
static DEVICE_ATTR_RO(vendor);

static ssize_t
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
	int ret;

	if (mutex_lock_interruptible(&xd->lock))
		return -ERESTARTSYS;
	ret = sprintf(buf, "%s\n", xd->vendor_name ? xd->vendor_name : "");
	mutex_unlock(&xd->lock);

	return ret;
}
static DEVICE_ATTR_RO(vendor_name);

static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);

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

static struct attribute *xdomain_attrs[] = {
	&dev_attr_device.attr,
	&dev_attr_device_name.attr,
	&dev_attr_unique_id.attr,
	&dev_attr_vendor.attr,
	&dev_attr_vendor_name.attr,
	NULL,
};

static struct attribute_group xdomain_attr_group = {
	.attrs = xdomain_attrs,
};

static const struct attribute_group *xdomain_attr_groups[] = {
	&xdomain_attr_group,
	NULL,
};

static void tb_xdomain_release(struct device *dev)
{
	struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);

	put_device(xd->dev.parent);

	tb_property_free_dir(xd->properties);
	ida_destroy(&xd->service_ids);

	kfree(xd->local_uuid);
	kfree(xd->remote_uuid);
	kfree(xd->device_name);
	kfree(xd->vendor_name);
	kfree(xd);
}

static void start_handshake(struct tb_xdomain *xd)
{
	xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES;
	xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES;

	/* Start exchanging properties with the other host */
	queue_delayed_work(xd->tb->wq, &xd->properties_changed_work,
			   msecs_to_jiffies(100));
	queue_delayed_work(xd->tb->wq, &xd->get_properties_work,
			   msecs_to_jiffies(1000));
}

static void stop_handshake(struct tb_xdomain *xd)
{
	xd->properties_retries = 0;
	xd->properties_changed_retries = 0;

	cancel_delayed_work_sync(&xd->get_properties_work);
	cancel_delayed_work_sync(&xd->properties_changed_work);
}

static int __maybe_unused tb_xdomain_suspend(struct device *dev)
{
	stop_handshake(tb_to_xdomain(dev));
	return 0;
}

static int __maybe_unused tb_xdomain_resume(struct device *dev)
{
	struct tb_xdomain *xd = tb_to_xdomain(dev);

	/*
	 * Ask tb_xdomain_get_properties() restore any existing DMA
	 * paths after properties are re-read.
	 */
	xd->resume = true;
	start_handshake(xd);

	return 0;
}

static const struct dev_pm_ops tb_xdomain_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tb_xdomain_suspend, tb_xdomain_resume)
};

struct device_type tb_xdomain_type = {
	.name = "thunderbolt_xdomain",
	.release = tb_xdomain_release,
	.pm = &tb_xdomain_pm_ops,
};
EXPORT_SYMBOL_GPL(tb_xdomain_type);

/**
 * tb_xdomain_alloc() - Allocate new XDomain object
 * @tb: Domain where the XDomain belongs
 * @parent: Parent device (the switch through the connection to the
 *	    other domain is reached).
 * @route: Route string used to reach the other domain
 * @local_uuid: Our local domain UUID
 * @remote_uuid: UUID of the other domain
 *
 * Allocates new XDomain structure and returns pointer to that. The
 * object must be released by calling tb_xdomain_put().
 */
struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
				    u64 route, const uuid_t *local_uuid,
				    const uuid_t *remote_uuid)
{
	struct tb_xdomain *xd;

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

	xd->tb = tb;
	xd->route = route;
	ida_init(&xd->service_ids);
	mutex_init(&xd->lock);
	INIT_DELAYED_WORK(&xd->get_properties_work, tb_xdomain_get_properties);
	INIT_DELAYED_WORK(&xd->properties_changed_work,
			  tb_xdomain_properties_changed);

	xd->local_uuid = kmemdup(local_uuid, sizeof(uuid_t), GFP_KERNEL);
	if (!xd->local_uuid)
		goto err_free;

	xd->remote_uuid = kmemdup(remote_uuid, sizeof(uuid_t), GFP_KERNEL);
	if (!xd->remote_uuid)
		goto err_free_local_uuid;

	device_initialize(&xd->dev);
	xd->dev.parent = get_device(parent);
	xd->dev.bus = &tb_bus_type;
	xd->dev.type = &tb_xdomain_type;
	xd->dev.groups = xdomain_attr_groups;
	dev_set_name(&xd->dev, "%u-%llx", tb->index, route);

1130 1131 1132 1133 1134 1135 1136 1137
	/*
	 * This keeps the DMA powered on as long as we have active
	 * connection to another host.
	 */
	pm_runtime_set_active(&xd->dev);
	pm_runtime_get_noresume(&xd->dev);
	pm_runtime_enable(&xd->dev);

1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
	return xd;

err_free_local_uuid:
	kfree(xd->local_uuid);
err_free:
	kfree(xd);

	return NULL;
}

/**
 * tb_xdomain_add() - Add XDomain to the bus
 * @xd: XDomain to add
 *
 * This function starts XDomain discovery protocol handshake and
 * eventually adds the XDomain to the bus. After calling this function
 * the caller needs to call tb_xdomain_remove() in order to remove and
 * release the object regardless whether the handshake succeeded or not.
 */
void tb_xdomain_add(struct tb_xdomain *xd)
{
	/* Start exchanging properties with the other host */
	start_handshake(xd);
}

static int unregister_service(struct device *dev, void *data)
{
	device_unregister(dev);
	return 0;
}

/**
 * tb_xdomain_remove() - Remove XDomain from the bus
 * @xd: XDomain to remove
 *
 * This will stop all ongoing configuration work and remove the XDomain
 * along with any services from the bus. When the last reference to @xd
 * is released the object will be released as well.
 */
void tb_xdomain_remove(struct tb_xdomain *xd)
{
	stop_handshake(xd);

	device_for_each_child_reverse(&xd->dev, xd, unregister_service);

1183 1184 1185 1186 1187 1188 1189 1190 1191
	/*
	 * Undo runtime PM here explicitly because it is possible that
	 * the XDomain was never added to the bus and thus device_del()
	 * is not called for it (device_del() would handle this otherwise).
	 */
	pm_runtime_disable(&xd->dev);
	pm_runtime_put_noidle(&xd->dev);
	pm_runtime_set_suspended(&xd->dev);

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 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 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
	if (!device_is_registered(&xd->dev))
		put_device(&xd->dev);
	else
		device_unregister(&xd->dev);
}

/**
 * tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection
 * @xd: XDomain connection
 * @transmit_path: HopID of the transmit path the other end is using to
 *		   send packets
 * @transmit_ring: DMA ring used to receive packets from the other end
 * @receive_path: HopID of the receive path the other end is using to
 *		  receive packets
 * @receive_ring: DMA ring used to send packets to the other end
 *
 * The function enables DMA paths accordingly so that after successful
 * return the caller can send and receive packets using high-speed DMA
 * path.
 *
 * Return: %0 in case of success and negative errno in case of error
 */
int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path,
			    u16 transmit_ring, u16 receive_path,
			    u16 receive_ring)
{
	int ret;

	mutex_lock(&xd->lock);

	if (xd->transmit_path) {
		ret = xd->transmit_path == transmit_path ? 0 : -EBUSY;
		goto exit_unlock;
	}

	xd->transmit_path = transmit_path;
	xd->transmit_ring = transmit_ring;
	xd->receive_path = receive_path;
	xd->receive_ring = receive_ring;

	ret = tb_domain_approve_xdomain_paths(xd->tb, xd);

exit_unlock:
	mutex_unlock(&xd->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(tb_xdomain_enable_paths);

/**
 * tb_xdomain_disable_paths() - Disable DMA paths for XDomain connection
 * @xd: XDomain connection
 *
 * This does the opposite of tb_xdomain_enable_paths(). After call to
 * this the caller is not expected to use the rings anymore.
 *
 * Return: %0 in case of success and negative errno in case of error
 */
int tb_xdomain_disable_paths(struct tb_xdomain *xd)
{
	int ret = 0;

	mutex_lock(&xd->lock);
	if (xd->transmit_path) {
		xd->transmit_path = 0;
		xd->transmit_ring = 0;
		xd->receive_path = 0;
		xd->receive_ring = 0;

		ret = tb_domain_disconnect_xdomain_paths(xd->tb, xd);
	}
	mutex_unlock(&xd->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(tb_xdomain_disable_paths);

struct tb_xdomain_lookup {
	const uuid_t *uuid;
	u8 link;
	u8 depth;
1273
	u64 route;
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
};

static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw,
	const struct tb_xdomain_lookup *lookup)
{
	int i;

	for (i = 1; i <= sw->config.max_port_number; i++) {
		struct tb_port *port = &sw->ports[i];
		struct tb_xdomain *xd;

		if (tb_is_upstream_port(port))
			continue;

		if (port->xdomain) {
			xd = port->xdomain;

			if (lookup->uuid) {
				if (uuid_equal(xd->remote_uuid, lookup->uuid))
					return xd;
1294 1295
			} else if (lookup->link &&
				   lookup->link == xd->link &&
1296 1297
				   lookup->depth == xd->depth) {
				return xd;
1298 1299 1300
			} else if (lookup->route &&
				   lookup->route == xd->route) {
				return xd;
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 1328 1329 1330 1331 1332 1333 1334 1335
			}
		} else if (port->remote) {
			xd = switch_find_xdomain(port->remote->sw, lookup);
			if (xd)
				return xd;
		}
	}

	return NULL;
}

/**
 * tb_xdomain_find_by_uuid() - Find an XDomain by UUID
 * @tb: Domain where the XDomain belongs to
 * @uuid: UUID to look for
 *
 * Finds XDomain by walking through the Thunderbolt topology below @tb.
 * The returned XDomain will have its reference count increased so the
 * caller needs to call tb_xdomain_put() when it is done with the
 * object.
 *
 * This will find all XDomains including the ones that are not yet added
 * to the bus (handshake is still in progress).
 *
 * The caller needs to hold @tb->lock.
 */
struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid)
{
	struct tb_xdomain_lookup lookup;
	struct tb_xdomain *xd;

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

	xd = switch_find_xdomain(tb->root_switch, &lookup);
1336
	return tb_xdomain_get(xd);
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
}
EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid);

/**
 * tb_xdomain_find_by_link_depth() - Find an XDomain by link and depth
 * @tb: Domain where the XDomain belongs to
 * @link: Root switch link number
 * @depth: Depth in the link
 *
 * Finds XDomain by walking through the Thunderbolt topology below @tb.
 * The returned XDomain will have its reference count increased so the
 * caller needs to call tb_xdomain_put() when it is done with the
 * object.
 *
 * This will find all XDomains including the ones that are not yet added
 * to the bus (handshake is still in progress).
 *
 * The caller needs to hold @tb->lock.
 */
struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
						 u8 depth)
{
	struct tb_xdomain_lookup lookup;
	struct tb_xdomain *xd;

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

	xd = switch_find_xdomain(tb->root_switch, &lookup);
1367 1368
	return tb_xdomain_get(xd);
}
1369

1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
/**
 * tb_xdomain_find_by_route() - Find an XDomain by route string
 * @tb: Domain where the XDomain belongs to
 * @route: XDomain route string
 *
 * Finds XDomain by walking through the Thunderbolt topology below @tb.
 * The returned XDomain will have its reference count increased so the
 * caller needs to call tb_xdomain_put() when it is done with the
 * object.
 *
 * This will find all XDomains including the ones that are not yet added
 * to the bus (handshake is still in progress).
 *
 * The caller needs to hold @tb->lock.
 */
struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route)
{
	struct tb_xdomain_lookup lookup;
	struct tb_xdomain *xd;

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

	xd = switch_find_xdomain(tb->root_switch, &lookup);
	return tb_xdomain_get(xd);
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}
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EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route);
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bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
			       const void *buf, size_t size)
{
	const struct tb_protocol_handler *handler, *tmp;
	const struct tb_xdp_header *hdr = buf;
	unsigned int length;
	int ret = 0;

	/* We expect the packet is at least size of the header */
	length = hdr->xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK;
	if (length != size / 4 - sizeof(hdr->xd_hdr) / 4)
		return true;
	if (length < sizeof(*hdr) / 4 - sizeof(hdr->xd_hdr) / 4)
		return true;

	/*
	 * Handle XDomain discovery protocol packets directly here. For
	 * other protocols (based on their UUID) we call registered
	 * handlers in turn.
	 */
	if (uuid_equal(&hdr->uuid, &tb_xdp_uuid)) {
		if (type == TB_CFG_PKG_XDOMAIN_REQ) {
			tb_xdp_schedule_request(tb, hdr, size);
			return true;
		}
		return false;
	}

	mutex_lock(&xdomain_lock);
	list_for_each_entry_safe(handler, tmp, &protocol_handlers, list) {
		if (!uuid_equal(&hdr->uuid, handler->uuid))
			continue;

		mutex_unlock(&xdomain_lock);
		ret = handler->callback(buf, size, handler->data);
		mutex_lock(&xdomain_lock);

		if (ret)
			break;
	}
	mutex_unlock(&xdomain_lock);

	return ret > 0;
}

static int rebuild_property_block(void)
{
	u32 *block, len;
	int ret;

	ret = tb_property_format_dir(xdomain_property_dir, NULL, 0);
	if (ret < 0)
		return ret;

	len = ret;

	block = kcalloc(len, sizeof(u32), GFP_KERNEL);
	if (!block)
		return -ENOMEM;

	ret = tb_property_format_dir(xdomain_property_dir, block, len);
	if (ret) {
		kfree(block);
		return ret;
	}

	kfree(xdomain_property_block);
	xdomain_property_block = block;
	xdomain_property_block_len = len;
	xdomain_property_block_gen++;

	return 0;
}

static int update_xdomain(struct device *dev, void *data)
{
	struct tb_xdomain *xd;

	xd = tb_to_xdomain(dev);
	if (xd) {
		queue_delayed_work(xd->tb->wq, &xd->properties_changed_work,
				   msecs_to_jiffies(50));
	}

	return 0;
}

static void update_all_xdomains(void)
{
	bus_for_each_dev(&tb_bus_type, NULL, NULL, update_xdomain);
}

static bool remove_directory(const char *key, const struct tb_property_dir *dir)
{
	struct tb_property *p;

	p = tb_property_find(xdomain_property_dir, key,
			     TB_PROPERTY_TYPE_DIRECTORY);
	if (p && p->value.dir == dir) {
		tb_property_remove(p);
		return true;
	}
	return false;
}

/**
 * tb_register_property_dir() - Register property directory to the host
 * @key: Key (name) of the directory to add
 * @dir: Directory to add
 *
 * Service drivers can use this function to add new property directory
 * to the host available properties. The other connected hosts are
 * notified so they can re-read properties of this host if they are
 * interested.
 *
 * Return: %0 on success and negative errno on failure
 */
int tb_register_property_dir(const char *key, struct tb_property_dir *dir)
{
	int ret;

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	if (WARN_ON(!xdomain_property_dir))
		return -EAGAIN;

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	if (!key || strlen(key) > 8)
		return -EINVAL;

	mutex_lock(&xdomain_lock);
	if (tb_property_find(xdomain_property_dir, key,
			     TB_PROPERTY_TYPE_DIRECTORY)) {
		ret = -EEXIST;
		goto err_unlock;
	}

	ret = tb_property_add_dir(xdomain_property_dir, key, dir);
	if (ret)
		goto err_unlock;

	ret = rebuild_property_block();
	if (ret) {
		remove_directory(key, dir);
		goto err_unlock;
	}

	mutex_unlock(&xdomain_lock);
	update_all_xdomains();
	return 0;

err_unlock:
	mutex_unlock(&xdomain_lock);
	return ret;
}
EXPORT_SYMBOL_GPL(tb_register_property_dir);

/**
 * tb_unregister_property_dir() - Removes property directory from host
 * @key: Key (name) of the directory
 * @dir: Directory to remove
 *
 * This will remove the existing directory from this host and notify the
 * connected hosts about the change.
 */
void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir)
{
	int ret = 0;

	mutex_lock(&xdomain_lock);
	if (remove_directory(key, dir))
		ret = rebuild_property_block();
	mutex_unlock(&xdomain_lock);

	if (!ret)
		update_all_xdomains();
}
EXPORT_SYMBOL_GPL(tb_unregister_property_dir);

int tb_xdomain_init(void)
{
	int ret;

	xdomain_property_dir = tb_property_create_dir(NULL);
	if (!xdomain_property_dir)
		return -ENOMEM;

	/*
	 * Initialize standard set of properties without any service
	 * directories. Those will be added by service drivers
	 * themselves when they are loaded.
	 */
	tb_property_add_immediate(xdomain_property_dir, "vendorid",
				  PCI_VENDOR_ID_INTEL);
	tb_property_add_text(xdomain_property_dir, "vendorid", "Intel Corp.");
	tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1);
	tb_property_add_text(xdomain_property_dir, "deviceid",
			     utsname()->nodename);
	tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100);

	ret = rebuild_property_block();
	if (ret) {
		tb_property_free_dir(xdomain_property_dir);
		xdomain_property_dir = NULL;
	}

	return ret;
}

void tb_xdomain_exit(void)
{
	kfree(xdomain_property_block);
	tb_property_free_dir(xdomain_property_dir);
}