diff options
Diffstat (limited to 'drivers/crypto/virtio/virtio_crypto_mgr.c')
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_mgr.c | 146 |
1 files changed, 89 insertions, 57 deletions
diff --git a/drivers/crypto/virtio/virtio_crypto_mgr.c b/drivers/crypto/virtio/virtio_crypto_mgr.c index a69ff71de2c4..06c74fa132cd 100644 --- a/drivers/crypto/virtio/virtio_crypto_mgr.c +++ b/drivers/crypto/virtio/virtio_crypto_mgr.c @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* Management for virtio crypto devices (refer to adf_dev_mgr.c) * * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <linux/mutex.h> @@ -94,42 +82,6 @@ void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev) } /* - * virtcrypto_devmgr_get_first() - * - * Function returns the first virtio crypto device from the acceleration - * framework. - * - * To be used by virtio crypto device specific drivers. - * - * Return: pointer to vcrypto_dev or NULL if not found. - */ -struct virtio_crypto *virtcrypto_devmgr_get_first(void) -{ - struct virtio_crypto *dev = NULL; - - mutex_lock(&table_lock); - if (!list_empty(&virtio_crypto_table)) - dev = list_first_entry(&virtio_crypto_table, - struct virtio_crypto, - list); - mutex_unlock(&table_lock); - return dev; -} - -/* - * virtcrypto_dev_in_use() - Check whether vcrypto_dev is currently in use - * @vcrypto_dev: Pointer to virtio crypto device. - * - * To be used by virtio crypto device specific drivers. - * - * Return: 1 when device is in use, 0 otherwise. - */ -int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev) -{ - return atomic_read(&vcrypto_dev->ref_count) != 0; -} - -/* * virtcrypto_dev_get() - Increment vcrypto_dev reference count * @vcrypto_dev: Pointer to virtio crypto device. * @@ -181,14 +133,20 @@ int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev) /* * virtcrypto_get_dev_node() - Get vcrypto_dev on the node. * @node: Node id the driver works. + * @service: Crypto service that needs to be supported by the + * dev + * @algo: The algorithm number that needs to be supported by the + * dev * - * Function returns the virtio crypto device used fewest on the node. + * Function returns the virtio crypto device used fewest on the node, + * and supports the given crypto service and algorithm. * * To be used by virtio crypto device specific drivers. * * Return: pointer to vcrypto_dev or NULL if not found. */ -struct virtio_crypto *virtcrypto_get_dev_node(int node) +struct virtio_crypto *virtcrypto_get_dev_node(int node, uint32_t service, + uint32_t algo) { struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev; unsigned long best = ~0; @@ -199,7 +157,8 @@ struct virtio_crypto *virtcrypto_get_dev_node(int node) if ((node == dev_to_node(&tmp_dev->vdev->dev) || dev_to_node(&tmp_dev->vdev->dev) < 0) && - virtcrypto_dev_started(tmp_dev)) { + virtcrypto_dev_started(tmp_dev) && + virtcrypto_algo_is_supported(tmp_dev, service, algo)) { ctr = atomic_read(&tmp_dev->ref_count); if (best > ctr) { vcrypto_dev = tmp_dev; @@ -214,7 +173,9 @@ struct virtio_crypto *virtcrypto_get_dev_node(int node) /* Get any started device */ list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) { - if (virtcrypto_dev_started(tmp_dev)) { + if (virtcrypto_dev_started(tmp_dev) && + virtcrypto_algo_is_supported(tmp_dev, + service, algo)) { vcrypto_dev = tmp_dev; break; } @@ -240,8 +201,14 @@ struct virtio_crypto *virtcrypto_get_dev_node(int node) */ int virtcrypto_dev_start(struct virtio_crypto *vcrypto) { - if (virtio_crypto_algs_register()) { - pr_err("virtio_crypto: Failed to register crypto algs\n"); + if (virtio_crypto_skcipher_algs_register(vcrypto)) { + pr_err("virtio_crypto: Failed to register crypto skcipher algs\n"); + return -EFAULT; + } + + if (virtio_crypto_akcipher_algs_register(vcrypto)) { + pr_err("virtio_crypto: Failed to register crypto akcipher algs\n"); + virtio_crypto_skcipher_algs_unregister(vcrypto); return -EFAULT; } @@ -253,12 +220,77 @@ int virtcrypto_dev_start(struct virtio_crypto *vcrypto) * @vcrypto: Pointer to virtio crypto device. * * Function notifies all the registered services that the virtio crypto device - * is ready to be used. + * shall no longer be used. * To be used by virtio crypto device specific drivers. * * Return: void */ void virtcrypto_dev_stop(struct virtio_crypto *vcrypto) { - virtio_crypto_algs_unregister(); + virtio_crypto_skcipher_algs_unregister(vcrypto); + virtio_crypto_akcipher_algs_unregister(vcrypto); +} + +/* + * vcrypto_algo_is_supported() + * @vcrypto: Pointer to virtio crypto device. + * @service: The bit number for service validate. + * See VIRTIO_CRYPTO_SERVICE_* + * @algo : The bit number for the algorithm to validate. + * + * + * Validate if the virtio crypto device supports a service and + * algo. + * + * Return true if device supports a service and algo. + */ + +bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto, + uint32_t service, + uint32_t algo) +{ + uint32_t service_mask = 1u << service; + uint32_t algo_mask = 0; + bool low = true; + + if (algo > 31) { + algo -= 32; + low = false; + } + + if (!(vcrypto->crypto_services & service_mask)) + return false; + + switch (service) { + case VIRTIO_CRYPTO_SERVICE_CIPHER: + if (low) + algo_mask = vcrypto->cipher_algo_l; + else + algo_mask = vcrypto->cipher_algo_h; + break; + + case VIRTIO_CRYPTO_SERVICE_HASH: + algo_mask = vcrypto->hash_algo; + break; + + case VIRTIO_CRYPTO_SERVICE_MAC: + if (low) + algo_mask = vcrypto->mac_algo_l; + else + algo_mask = vcrypto->mac_algo_h; + break; + + case VIRTIO_CRYPTO_SERVICE_AEAD: + algo_mask = vcrypto->aead_algo; + break; + + case VIRTIO_CRYPTO_SERVICE_AKCIPHER: + algo_mask = vcrypto->akcipher_algo; + break; + } + + if (!(algo_mask & (1u << algo))) + return false; + + return true; } |