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Release 4.14 drivers/thunderbolt/domain.c

/*
 * Thunderbolt bus support
 *
 * Copyright (C) 2017, Intel Corporation
 * Author:  Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <crypto/hash.h>

#include "tb.h"

static DEFINE_IDA(tb_domain_ida);


static const char * const tb_security_names[] = {
	[TB_SECURITY_NONE] = "none",
	[TB_SECURITY_USER] = "user",
	[TB_SECURITY_SECURE] = "secure",
	[TB_SECURITY_DPONLY] = "dponly",
};


static ssize_t security_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tb *tb = container_of(dev, struct tb, dev); return sprintf(buf, "%s\n", tb_security_names[tb->security_level]); }

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Mika Westerberg50100.00%1100.00%
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static DEVICE_ATTR_RO(security); static struct attribute *domain_attrs[] = { &dev_attr_security.attr, NULL, }; static struct attribute_group domain_attr_group = { .attrs = domain_attrs, }; static const struct attribute_group *domain_attr_groups[] = { &domain_attr_group, NULL, }; struct bus_type tb_bus_type = { .name = "thunderbolt", };
static void tb_domain_release(struct device *dev) { struct tb *tb = container_of(dev, struct tb, dev); tb_ctl_free(tb->ctl); destroy_workqueue(tb->wq); ida_simple_remove(&tb_domain_ida, tb->index); mutex_destroy(&tb->lock); kfree(tb); }

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Mika Westerberg63100.00%1100.00%
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struct device_type tb_domain_type = { .name = "thunderbolt_domain", .release = tb_domain_release, }; /** * tb_domain_alloc() - Allocate a domain * @nhi: Pointer to the host controller * @privsize: Size of the connection manager private data * * Allocates and initializes a new Thunderbolt domain. Connection * managers are expected to call this and then fill in @cm_ops * accordingly. * * Call tb_domain_put() to release the domain before it has been added * to the system. * * Return: allocated domain structure on %NULL in case of error */
struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize) { struct tb *tb; /* * Make sure the structure sizes map with that the hardware * expects because bit-fields are being used. */ BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4); BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4); BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4); tb = kzalloc(sizeof(*tb) + privsize, GFP_KERNEL); if (!tb) return NULL; tb->nhi = nhi; mutex_init(&tb->lock); tb->index = ida_simple_get(&tb_domain_ida, 0, 0, GFP_KERNEL); if (tb->index < 0) goto err_free; tb->wq = alloc_ordered_workqueue("thunderbolt%d", 0, tb->index); if (!tb->wq) goto err_remove_ida; tb->dev.parent = &nhi->pdev->dev; tb->dev.bus = &tb_bus_type; tb->dev.type = &tb_domain_type; tb->dev.groups = domain_attr_groups; dev_set_name(&tb->dev, "domain%d", tb->index); device_initialize(&tb->dev); return tb; err_remove_ida: ida_simple_remove(&tb_domain_ida, tb->index); err_free: kfree(tb); return NULL; }

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Mika Westerberg235100.00%2100.00%
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static void tb_domain_event_cb(void *data, enum tb_cfg_pkg_type type, const void *buf, size_t size) { struct tb *tb = data; if (!tb->cm_ops->handle_event) { tb_warn(tb, "domain does not have event handler\n"); return; } tb->cm_ops->handle_event(tb, type, buf, size); }

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Mika Westerberg63100.00%1100.00%
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/** * tb_domain_add() - Add domain to the system * @tb: Domain to add * * Starts the domain and adds it to the system. Hotplugging devices will * work after this has been returned successfully. In order to remove * and release the domain after this function has been called, call * tb_domain_remove(). * * Return: %0 in case of success and negative errno in case of error */
int tb_domain_add(struct tb *tb) { int ret; if (WARN_ON(!tb->cm_ops)) return -EINVAL; mutex_lock(&tb->lock); tb->ctl = tb_ctl_alloc(tb->nhi, tb_domain_event_cb, tb); if (!tb->ctl) { ret = -ENOMEM; goto err_unlock; } /* * tb_schedule_hotplug_handler may be called as soon as the config * channel is started. Thats why we have to hold the lock here. */ tb_ctl_start(tb->ctl); if (tb->cm_ops->driver_ready) { ret = tb->cm_ops->driver_ready(tb); if (ret) goto err_ctl_stop; } ret = device_add(&tb->dev); if (ret) goto err_ctl_stop; /* Start the domain */ if (tb->cm_ops->start) { ret = tb->cm_ops->start(tb); if (ret) goto err_domain_del; } /* This starts event processing */ mutex_unlock(&tb->lock); return 0; err_domain_del: device_del(&tb->dev); err_ctl_stop: tb_ctl_stop(tb->ctl); err_unlock: mutex_unlock(&tb->lock); return ret; }

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Mika Westerberg193100.00%3100.00%
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/** * tb_domain_remove() - Removes and releases a domain * @tb: Domain to remove * * Stops the domain, removes it from the system and releases all * resources once the last reference has been released. */
void tb_domain_remove(struct tb *tb) { mutex_lock(&tb->lock); if (tb->cm_ops->stop) tb->cm_ops->stop(tb); /* Stop the domain control traffic */ tb_ctl_stop(tb->ctl); mutex_unlock(&tb->lock); flush_workqueue(tb->wq); device_unregister(&tb->dev); }

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Mika Westerberg66100.00%1100.00%
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/** * tb_domain_suspend_noirq() - Suspend a domain * @tb: Domain to suspend * * Suspends all devices in the domain and stops the control channel. */
int tb_domain_suspend_noirq(struct tb *tb) { int ret = 0; /* * The control channel interrupt is left enabled during suspend * and taking the lock here prevents any events happening before * we actually have stopped the domain and the control channel. */ mutex_lock(&tb->lock); if (tb->cm_ops->suspend_noirq) ret = tb->cm_ops->suspend_noirq(tb); if (!ret) tb_ctl_stop(tb->ctl); mutex_unlock(&tb->lock); return ret; }

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Mika Westerberg66100.00%1100.00%
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/** * tb_domain_resume_noirq() - Resume a domain * @tb: Domain to resume * * Re-starts the control channel, and resumes all devices connected to * the domain. */
int tb_domain_resume_noirq(struct tb *tb) { int ret = 0; mutex_lock(&tb->lock); tb_ctl_start(tb->ctl); if (tb->cm_ops->resume_noirq) ret = tb->cm_ops->resume_noirq(tb); mutex_unlock(&tb->lock); return ret; }

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Mika Westerberg60100.00%1100.00%
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int tb_domain_suspend(struct tb *tb) { int ret; mutex_lock(&tb->lock); if (tb->cm_ops->suspend) { ret = tb->cm_ops->suspend(tb); if (ret) { mutex_unlock(&tb->lock); return ret; } } mutex_unlock(&tb->lock); return 0; }

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void tb_domain_complete(struct tb *tb) { mutex_lock(&tb->lock); if (tb->cm_ops->complete) tb->cm_ops->complete(tb); mutex_unlock(&tb->lock); }

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/** * tb_domain_approve_switch() - Approve switch * @tb: Domain the switch belongs to * @sw: Switch to approve * * This will approve switch by connection manager specific means. In * case of success the connection manager will create tunnels for all * supported protocols. */
int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw) { struct tb_switch *parent_sw; if (!tb->cm_ops->approve_switch) return -EPERM; /* The parent switch must be authorized before this one */ parent_sw = tb_to_switch(sw->dev.parent); if (!parent_sw || !parent_sw->authorized) return -EINVAL; return tb->cm_ops->approve_switch(tb, sw); }

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Mika Westerberg71100.00%1100.00%
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/** * tb_domain_approve_switch_key() - Approve switch and add key * @tb: Domain the switch belongs to * @sw: Switch to approve * * For switches that support secure connect, this function first adds * key to the switch NVM using connection manager specific means. If * adding the key is successful, the switch is approved and connected. * * Return: %0 on success and negative errno in case of failure. */
int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw) { struct tb_switch *parent_sw; int ret; if (!tb->cm_ops->approve_switch || !tb->cm_ops->add_switch_key) return -EPERM; /* The parent switch must be authorized before this one */ parent_sw = tb_to_switch(sw->dev.parent); if (!parent_sw || !parent_sw->authorized) return -EINVAL; ret = tb->cm_ops->add_switch_key(tb, sw); if (ret) return ret; return tb->cm_ops->approve_switch(tb, sw); }

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Mika Westerberg101100.00%1100.00%
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/** * tb_domain_challenge_switch_key() - Challenge and approve switch * @tb: Domain the switch belongs to * @sw: Switch to approve * * For switches that support secure connect, this function generates * random challenge and sends it to the switch. The switch responds to * this and if the response matches our random challenge, the switch is * approved and connected. * * Return: %0 on success and negative errno in case of failure. */
int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw) { u8 challenge[TB_SWITCH_KEY_SIZE]; u8 response[TB_SWITCH_KEY_SIZE]; u8 hmac[TB_SWITCH_KEY_SIZE]; struct tb_switch *parent_sw; struct crypto_shash *tfm; struct shash_desc *shash; int ret; if (!tb->cm_ops->approve_switch || !tb->cm_ops->challenge_switch_key) return -EPERM; /* The parent switch must be authorized before this one */ parent_sw = tb_to_switch(sw->dev.parent); if (!parent_sw || !parent_sw->authorized) return -EINVAL; get_random_bytes(challenge, sizeof(challenge)); ret = tb->cm_ops->challenge_switch_key(tb, sw, challenge, response); if (ret) return ret; tfm = crypto_alloc_shash("hmac(sha256)", 0, 0); if (IS_ERR(tfm)) return PTR_ERR(tfm); ret = crypto_shash_setkey(tfm, sw->key, TB_SWITCH_KEY_SIZE); if (ret) goto err_free_tfm; shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm), GFP_KERNEL); if (!shash) { ret = -ENOMEM; goto err_free_tfm; } shash->tfm = tfm; shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP; memset(hmac, 0, sizeof(hmac)); ret = crypto_shash_digest(shash, challenge, sizeof(hmac), hmac); if (ret) goto err_free_shash; /* The returned HMAC must match the one we calculated */ if (memcmp(response, hmac, sizeof(hmac))) { ret = -EKEYREJECTED; goto err_free_shash; } crypto_free_shash(tfm); kfree(shash); return tb->cm_ops->approve_switch(tb, sw); err_free_shash: kfree(shash); err_free_tfm: crypto_free_shash(tfm); return ret; }

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Mika Westerberg319100.00%1100.00%
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/** * tb_domain_disconnect_pcie_paths() - Disconnect all PCIe paths * @tb: Domain whose PCIe paths to disconnect * * This needs to be called in preparation for NVM upgrade of the host * controller. Makes sure all PCIe paths are disconnected. * * Return %0 on success and negative errno in case of error. */
int tb_domain_disconnect_pcie_paths(struct tb *tb) { if (!tb->cm_ops->disconnect_pcie_paths) return -EPERM; return tb->cm_ops->disconnect_pcie_paths(tb); }

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Mika Westerberg33100.00%1100.00%
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int tb_domain_init(void) { return bus_register(&tb_bus_type); }

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void tb_domain_exit(void) { bus_unregister(&tb_bus_type); ida_destroy(&tb_domain_ida); tb_switch_exit(); }

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Mika Westerberg22100.00%2100.00%
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Mika Westerberg1616100.00%4100.00%
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