diff options
Diffstat (limited to 'drivers/crypto/virtio')
| -rw-r--r-- | drivers/crypto/virtio/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/crypto/virtio/Makefile | 6 | ||||
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_algs.c | 691 | ||||
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_common.h | 147 | ||||
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_core.c | 542 | ||||
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_mgr.c | 333 |
6 files changed, 1729 insertions, 0 deletions
diff --git a/drivers/crypto/virtio/Kconfig b/drivers/crypto/virtio/Kconfig new file mode 100644 index 000000000..a4324b138 --- /dev/null +++ b/drivers/crypto/virtio/Kconfig @@ -0,0 +1,10 @@ +config CRYPTO_DEV_VIRTIO + tristate "VirtIO crypto driver" + depends on VIRTIO + select CRYPTO_AEAD + select CRYPTO_BLKCIPHER + select CRYPTO_ENGINE + default m + help + This driver provides support for virtio crypto device. If you + choose 'M' here, this module will be called virtio_crypto. diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile new file mode 100644 index 000000000..cbfccccfa --- /dev/null +++ b/drivers/crypto/virtio/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio_crypto.o +virtio_crypto-objs := \ + virtio_crypto_algs.o \ + virtio_crypto_mgr.o \ + virtio_crypto_core.o diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c new file mode 100644 index 000000000..ab4700e4b --- /dev/null +++ b/drivers/crypto/virtio/virtio_crypto_algs.c @@ -0,0 +1,691 @@ + /* Algorithms supported by virtio crypto device + * + * Authors: Gonglei <arei.gonglei@huawei.com> + * + * 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/scatterlist.h> +#include <crypto/algapi.h> +#include <linux/err.h> +#include <crypto/scatterwalk.h> +#include <linux/atomic.h> + +#include <uapi/linux/virtio_crypto.h> +#include "virtio_crypto_common.h" + + +struct virtio_crypto_ablkcipher_ctx { + struct crypto_engine_ctx enginectx; + struct virtio_crypto *vcrypto; + struct crypto_tfm *tfm; + + struct virtio_crypto_sym_session_info enc_sess_info; + struct virtio_crypto_sym_session_info dec_sess_info; +}; + +struct virtio_crypto_sym_request { + struct virtio_crypto_request base; + + /* Cipher or aead */ + uint32_t type; + struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx; + struct ablkcipher_request *ablkcipher_req; + uint8_t *iv; + /* Encryption? */ + bool encrypt; +}; + +struct virtio_crypto_algo { + uint32_t algonum; + uint32_t service; + unsigned int active_devs; + struct crypto_alg algo; +}; + +/* + * The algs_lock protects the below global virtio_crypto_active_devs + * and crypto algorithms registion. + */ +static DEFINE_MUTEX(algs_lock); +static void virtio_crypto_ablkcipher_finalize_req( + struct virtio_crypto_sym_request *vc_sym_req, + struct ablkcipher_request *req, + int err); + +static void virtio_crypto_dataq_sym_callback + (struct virtio_crypto_request *vc_req, int len) +{ + struct virtio_crypto_sym_request *vc_sym_req = + container_of(vc_req, struct virtio_crypto_sym_request, base); + struct ablkcipher_request *ablk_req; + int error; + + /* Finish the encrypt or decrypt process */ + if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) { + switch (vc_req->status) { + case VIRTIO_CRYPTO_OK: + error = 0; + break; + case VIRTIO_CRYPTO_INVSESS: + case VIRTIO_CRYPTO_ERR: + error = -EINVAL; + break; + case VIRTIO_CRYPTO_BADMSG: + error = -EBADMSG; + break; + default: + error = -EIO; + break; + } + ablk_req = vc_sym_req->ablkcipher_req; + virtio_crypto_ablkcipher_finalize_req(vc_sym_req, + ablk_req, error); + } +} + +static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg) +{ + u64 total = 0; + + for (total = 0; sg; sg = sg_next(sg)) + total += sg->length; + + return total; +} + +static int +virtio_crypto_alg_validate_key(int key_len, uint32_t *alg) +{ + switch (key_len) { + case AES_KEYSIZE_128: + case AES_KEYSIZE_192: + case AES_KEYSIZE_256: + *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC; + break; + default: + return -EINVAL; + } + return 0; +} + +static int virtio_crypto_alg_ablkcipher_init_session( + struct virtio_crypto_ablkcipher_ctx *ctx, + uint32_t alg, const uint8_t *key, + unsigned int keylen, + int encrypt) +{ + struct scatterlist outhdr, key_sg, inhdr, *sgs[3]; + unsigned int tmp; + struct virtio_crypto *vcrypto = ctx->vcrypto; + int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT; + int err; + unsigned int num_out = 0, num_in = 0; + + /* + * Avoid to do DMA from the stack, switch to using + * dynamically-allocated for the key + */ + uint8_t *cipher_key = kmalloc(keylen, GFP_ATOMIC); + + if (!cipher_key) + return -ENOMEM; + + memcpy(cipher_key, key, keylen); + + spin_lock(&vcrypto->ctrl_lock); + /* Pad ctrl header */ + vcrypto->ctrl.header.opcode = + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); + vcrypto->ctrl.header.algo = cpu_to_le32(alg); + /* Set the default dataqueue id to 0 */ + vcrypto->ctrl.header.queue_id = 0; + + vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR); + /* Pad cipher's parameters */ + vcrypto->ctrl.u.sym_create_session.op_type = + cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); + vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo = + vcrypto->ctrl.header.algo; + vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen = + cpu_to_le32(keylen); + vcrypto->ctrl.u.sym_create_session.u.cipher.para.op = + cpu_to_le32(op); + + sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); + sgs[num_out++] = &outhdr; + + /* Set key */ + sg_init_one(&key_sg, cipher_key, keylen); + sgs[num_out++] = &key_sg; + + /* Return status and session id back */ + sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input)); + sgs[num_out + num_in++] = &inhdr; + + err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, + num_in, vcrypto, GFP_ATOMIC); + if (err < 0) { + spin_unlock(&vcrypto->ctrl_lock); + kzfree(cipher_key); + return err; + } + virtqueue_kick(vcrypto->ctrl_vq); + + /* + * Trapping into the hypervisor, so the request should be + * handled immediately. + */ + while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) && + !virtqueue_is_broken(vcrypto->ctrl_vq)) + cpu_relax(); + + if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) { + spin_unlock(&vcrypto->ctrl_lock); + pr_err("virtio_crypto: Create session failed status: %u\n", + le32_to_cpu(vcrypto->input.status)); + kzfree(cipher_key); + return -EINVAL; + } + + if (encrypt) + ctx->enc_sess_info.session_id = + le64_to_cpu(vcrypto->input.session_id); + else + ctx->dec_sess_info.session_id = + le64_to_cpu(vcrypto->input.session_id); + + spin_unlock(&vcrypto->ctrl_lock); + + kzfree(cipher_key); + return 0; +} + +static int virtio_crypto_alg_ablkcipher_close_session( + struct virtio_crypto_ablkcipher_ctx *ctx, + int encrypt) +{ + struct scatterlist outhdr, status_sg, *sgs[2]; + unsigned int tmp; + struct virtio_crypto_destroy_session_req *destroy_session; + struct virtio_crypto *vcrypto = ctx->vcrypto; + int err; + unsigned int num_out = 0, num_in = 0; + + spin_lock(&vcrypto->ctrl_lock); + vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR; + /* Pad ctrl header */ + vcrypto->ctrl.header.opcode = + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); + /* Set the default virtqueue id to 0 */ + vcrypto->ctrl.header.queue_id = 0; + + destroy_session = &vcrypto->ctrl.u.destroy_session; + + if (encrypt) + destroy_session->session_id = + cpu_to_le64(ctx->enc_sess_info.session_id); + else + destroy_session->session_id = + cpu_to_le64(ctx->dec_sess_info.session_id); + + sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); + sgs[num_out++] = &outhdr; + + /* Return status and session id back */ + sg_init_one(&status_sg, &vcrypto->ctrl_status.status, + sizeof(vcrypto->ctrl_status.status)); + sgs[num_out + num_in++] = &status_sg; + + err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, + num_in, vcrypto, GFP_ATOMIC); + if (err < 0) { + spin_unlock(&vcrypto->ctrl_lock); + return err; + } + virtqueue_kick(vcrypto->ctrl_vq); + + while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) && + !virtqueue_is_broken(vcrypto->ctrl_vq)) + cpu_relax(); + + if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) { + spin_unlock(&vcrypto->ctrl_lock); + pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n", + vcrypto->ctrl_status.status, + destroy_session->session_id); + + return -EINVAL; + } + spin_unlock(&vcrypto->ctrl_lock); + + return 0; +} + +static int virtio_crypto_alg_ablkcipher_init_sessions( + struct virtio_crypto_ablkcipher_ctx *ctx, + const uint8_t *key, unsigned int keylen) +{ + uint32_t alg; + int ret; + struct virtio_crypto *vcrypto = ctx->vcrypto; + + if (keylen > vcrypto->max_cipher_key_len) { + pr_err("virtio_crypto: the key is too long\n"); + goto bad_key; + } + + if (virtio_crypto_alg_validate_key(keylen, &alg)) + goto bad_key; + + /* Create encryption session */ + ret = virtio_crypto_alg_ablkcipher_init_session(ctx, + alg, key, keylen, 1); + if (ret) + return ret; + /* Create decryption session */ + ret = virtio_crypto_alg_ablkcipher_init_session(ctx, + alg, key, keylen, 0); + if (ret) { + virtio_crypto_alg_ablkcipher_close_session(ctx, 1); + return ret; + } + return 0; + +bad_key: + crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; +} + +/* Note: kernel crypto API realization */ +static int virtio_crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm, + const uint8_t *key, + unsigned int keylen) +{ + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm); + uint32_t alg; + int ret; + + ret = virtio_crypto_alg_validate_key(keylen, &alg); + if (ret) + return ret; + + if (!ctx->vcrypto) { + /* New key */ + int node = virtio_crypto_get_current_node(); + struct virtio_crypto *vcrypto = + virtcrypto_get_dev_node(node, + VIRTIO_CRYPTO_SERVICE_CIPHER, alg); + if (!vcrypto) { + pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n"); + return -ENODEV; + } + + ctx->vcrypto = vcrypto; + } else { + /* Rekeying, we should close the created sessions previously */ + virtio_crypto_alg_ablkcipher_close_session(ctx, 1); + virtio_crypto_alg_ablkcipher_close_session(ctx, 0); + } + + ret = virtio_crypto_alg_ablkcipher_init_sessions(ctx, key, keylen); + if (ret) { + virtcrypto_dev_put(ctx->vcrypto); + ctx->vcrypto = NULL; + + return ret; + } + + return 0; +} + +static int +__virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req, + struct ablkcipher_request *req, + struct data_queue *data_vq) +{ + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); + struct virtio_crypto_ablkcipher_ctx *ctx = vc_sym_req->ablkcipher_ctx; + struct virtio_crypto_request *vc_req = &vc_sym_req->base; + unsigned int ivsize = crypto_ablkcipher_ivsize(tfm); + struct virtio_crypto *vcrypto = ctx->vcrypto; + struct virtio_crypto_op_data_req *req_data; + int src_nents, dst_nents; + int err; + unsigned long flags; + struct scatterlist outhdr, iv_sg, status_sg, **sgs; + u64 dst_len; + unsigned int num_out = 0, num_in = 0; + int sg_total; + uint8_t *iv; + struct scatterlist *sg; + + src_nents = sg_nents_for_len(req->src, req->nbytes); + if (src_nents < 0) { + pr_err("Invalid number of src SG.\n"); + return src_nents; + } + + dst_nents = sg_nents(req->dst); + + pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n", + src_nents, dst_nents); + + /* Why 3? outhdr + iv + inhdr */ + sg_total = src_nents + dst_nents + 3; + sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL, + dev_to_node(&vcrypto->vdev->dev)); + if (!sgs) + return -ENOMEM; + + req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL, + dev_to_node(&vcrypto->vdev->dev)); + if (!req_data) { + kfree(sgs); + return -ENOMEM; + } + + vc_req->req_data = req_data; + vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER; + /* Head of operation */ + if (vc_sym_req->encrypt) { + req_data->header.session_id = + cpu_to_le64(ctx->enc_sess_info.session_id); + req_data->header.opcode = + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT); + } else { + req_data->header.session_id = + cpu_to_le64(ctx->dec_sess_info.session_id); + req_data->header.opcode = + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT); + } + req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); + req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize); + req_data->u.sym_req.u.cipher.para.src_data_len = + cpu_to_le32(req->nbytes); + + dst_len = virtio_crypto_alg_sg_nents_length(req->dst); + if (unlikely(dst_len > U32_MAX)) { + pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n"); + err = -EINVAL; + goto free; + } + + dst_len = min_t(unsigned int, req->nbytes, dst_len); + pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n", + req->nbytes, dst_len); + + if (unlikely(req->nbytes + dst_len + ivsize + + sizeof(vc_req->status) > vcrypto->max_size)) { + pr_err("virtio_crypto: The length is too big\n"); + err = -EINVAL; + goto free; + } + + req_data->u.sym_req.u.cipher.para.dst_data_len = + cpu_to_le32((uint32_t)dst_len); + + /* Outhdr */ + sg_init_one(&outhdr, req_data, sizeof(*req_data)); + sgs[num_out++] = &outhdr; + + /* IV */ + + /* + * Avoid to do DMA from the stack, switch to using + * dynamically-allocated for the IV + */ + iv = kzalloc_node(ivsize, GFP_ATOMIC, + dev_to_node(&vcrypto->vdev->dev)); + if (!iv) { + err = -ENOMEM; + goto free; + } + memcpy(iv, req->info, ivsize); + if (!vc_sym_req->encrypt) + scatterwalk_map_and_copy(req->info, req->src, + req->nbytes - AES_BLOCK_SIZE, + AES_BLOCK_SIZE, 0); + + sg_init_one(&iv_sg, iv, ivsize); + sgs[num_out++] = &iv_sg; + vc_sym_req->iv = iv; + + /* Source data */ + for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--) + sgs[num_out++] = sg; + + /* Destination data */ + for (sg = req->dst; sg; sg = sg_next(sg)) + sgs[num_out + num_in++] = sg; + + /* Status */ + sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status)); + sgs[num_out + num_in++] = &status_sg; + + vc_req->sgs = sgs; + + spin_lock_irqsave(&data_vq->lock, flags); + err = virtqueue_add_sgs(data_vq->vq, sgs, num_out, + num_in, vc_req, GFP_ATOMIC); + virtqueue_kick(data_vq->vq); + spin_unlock_irqrestore(&data_vq->lock, flags); + if (unlikely(err < 0)) + goto free_iv; + + return 0; + +free_iv: + kzfree(iv); +free: + kzfree(req_data); + kfree(sgs); + return err; +} + +static int virtio_crypto_ablkcipher_encrypt(struct ablkcipher_request *req) +{ + struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req); + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm); + struct virtio_crypto_sym_request *vc_sym_req = + ablkcipher_request_ctx(req); + struct virtio_crypto_request *vc_req = &vc_sym_req->base; + struct virtio_crypto *vcrypto = ctx->vcrypto; + /* Use the first data virtqueue as default */ + struct data_queue *data_vq = &vcrypto->data_vq[0]; + + if (!req->nbytes) + return 0; + if (req->nbytes % AES_BLOCK_SIZE) + return -EINVAL; + + vc_req->dataq = data_vq; + vc_req->alg_cb = virtio_crypto_dataq_sym_callback; + vc_sym_req->ablkcipher_ctx = ctx; + vc_sym_req->ablkcipher_req = req; + vc_sym_req->encrypt = true; + + return crypto_transfer_ablkcipher_request_to_engine(data_vq->engine, req); +} + +static int virtio_crypto_ablkcipher_decrypt(struct ablkcipher_request *req) +{ + struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req); + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm); + struct virtio_crypto_sym_request *vc_sym_req = + ablkcipher_request_ctx(req); + struct virtio_crypto_request *vc_req = &vc_sym_req->base; + struct virtio_crypto *vcrypto = ctx->vcrypto; + /* Use the first data virtqueue as default */ + struct data_queue *data_vq = &vcrypto->data_vq[0]; + + if (!req->nbytes) + return 0; + if (req->nbytes % AES_BLOCK_SIZE) + return -EINVAL; + + vc_req->dataq = data_vq; + vc_req->alg_cb = virtio_crypto_dataq_sym_callback; + vc_sym_req->ablkcipher_ctx = ctx; + vc_sym_req->ablkcipher_req = req; + vc_sym_req->encrypt = false; + + return crypto_transfer_ablkcipher_request_to_engine(data_vq->engine, req); +} + +static int virtio_crypto_ablkcipher_init(struct crypto_tfm *tfm) +{ + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm); + + tfm->crt_ablkcipher.reqsize = sizeof(struct virtio_crypto_sym_request); + ctx->tfm = tfm; + + ctx->enginectx.op.do_one_request = virtio_crypto_ablkcipher_crypt_req; + ctx->enginectx.op.prepare_request = NULL; + ctx->enginectx.op.unprepare_request = NULL; + return 0; +} + +static void virtio_crypto_ablkcipher_exit(struct crypto_tfm *tfm) +{ + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm); + + if (!ctx->vcrypto) + return; + + virtio_crypto_alg_ablkcipher_close_session(ctx, 1); + virtio_crypto_alg_ablkcipher_close_session(ctx, 0); + virtcrypto_dev_put(ctx->vcrypto); + ctx->vcrypto = NULL; +} + +int virtio_crypto_ablkcipher_crypt_req( + struct crypto_engine *engine, void *vreq) +{ + struct ablkcipher_request *req = container_of(vreq, struct ablkcipher_request, base); + struct virtio_crypto_sym_request *vc_sym_req = + ablkcipher_request_ctx(req); + struct virtio_crypto_request *vc_req = &vc_sym_req->base; + struct data_queue *data_vq = vc_req->dataq; + int ret; + + ret = __virtio_crypto_ablkcipher_do_req(vc_sym_req, req, data_vq); + if (ret < 0) + return ret; + + virtqueue_kick(data_vq->vq); + + return 0; +} + +static void virtio_crypto_ablkcipher_finalize_req( + struct virtio_crypto_sym_request *vc_sym_req, + struct ablkcipher_request *req, + int err) +{ + if (vc_sym_req->encrypt) + scatterwalk_map_and_copy(req->info, req->dst, + req->nbytes - AES_BLOCK_SIZE, + AES_BLOCK_SIZE, 0); + kzfree(vc_sym_req->iv); + virtcrypto_clear_request(&vc_sym_req->base); + + crypto_finalize_ablkcipher_request(vc_sym_req->base.dataq->engine, + req, err); +} + +static struct virtio_crypto_algo virtio_crypto_algs[] = { { + .algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC, + .service = VIRTIO_CRYPTO_SERVICE_CIPHER, + .algo = { + .cra_name = "cbc(aes)", + .cra_driver_name = "virtio_crypto_aes_cbc", + .cra_priority = 150, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct virtio_crypto_ablkcipher_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + .cra_type = &crypto_ablkcipher_type, + .cra_init = virtio_crypto_ablkcipher_init, + .cra_exit = virtio_crypto_ablkcipher_exit, + .cra_u = { + .ablkcipher = { + .setkey = virtio_crypto_ablkcipher_setkey, + .decrypt = virtio_crypto_ablkcipher_decrypt, + .encrypt = virtio_crypto_ablkcipher_encrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, + }, + }, +} }; + +int virtio_crypto_algs_register(struct virtio_crypto *vcrypto) +{ + int ret = 0; + int i = 0; + + mutex_lock(&algs_lock); + + for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { + + uint32_t service = virtio_crypto_algs[i].service; + uint32_t algonum = virtio_crypto_algs[i].algonum; + + if (!virtcrypto_algo_is_supported(vcrypto, service, algonum)) + continue; + + if (virtio_crypto_algs[i].active_devs == 0) { + ret = crypto_register_alg(&virtio_crypto_algs[i].algo); + if (ret) + goto unlock; + } + + virtio_crypto_algs[i].active_devs++; + dev_info(&vcrypto->vdev->dev, "Registered algo %s\n", + virtio_crypto_algs[i].algo.cra_name); + } + +unlock: + mutex_unlock(&algs_lock); + return ret; +} + +void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto) +{ + int i = 0; + + mutex_lock(&algs_lock); + + for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { + + uint32_t service = virtio_crypto_algs[i].service; + uint32_t algonum = virtio_crypto_algs[i].algonum; + + if (virtio_crypto_algs[i].active_devs == 0 || + !virtcrypto_algo_is_supported(vcrypto, service, algonum)) + continue; + + if (virtio_crypto_algs[i].active_devs == 1) + crypto_unregister_alg(&virtio_crypto_algs[i].algo); + + virtio_crypto_algs[i].active_devs--; + } + + mutex_unlock(&algs_lock); +} diff --git a/drivers/crypto/virtio/virtio_crypto_common.h b/drivers/crypto/virtio/virtio_crypto_common.h new file mode 100644 index 000000000..63ef7f792 --- /dev/null +++ b/drivers/crypto/virtio/virtio_crypto_common.h @@ -0,0 +1,147 @@ +/* Common header for Virtio crypto device. + * + * 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/>. + */ + +#ifndef _VIRTIO_CRYPTO_COMMON_H +#define _VIRTIO_CRYPTO_COMMON_H + +#include <linux/virtio.h> +#include <linux/crypto.h> +#include <linux/spinlock.h> +#include <crypto/aead.h> +#include <crypto/aes.h> +#include <crypto/engine.h> + + +/* Internal representation of a data virtqueue */ +struct data_queue { + /* Virtqueue associated with this send _queue */ + struct virtqueue *vq; + + /* To protect the vq operations for the dataq */ + spinlock_t lock; + + /* Name of the tx queue: dataq.$index */ + char name[32]; + + struct crypto_engine *engine; +}; + +struct virtio_crypto { + struct virtio_device *vdev; + struct virtqueue *ctrl_vq; + struct data_queue *data_vq; + + /* To protect the vq operations for the controlq */ + spinlock_t ctrl_lock; + + /* Maximum of data queues supported by the device */ + u32 max_data_queues; + + /* Number of queue currently used by the driver */ + u32 curr_queue; + + /* + * Specifies the services mask which the device support, + * see VIRTIO_CRYPTO_SERVICE_* + */ + u32 crypto_services; + + /* Detailed algorithms mask */ + u32 cipher_algo_l; + u32 cipher_algo_h; + u32 hash_algo; + u32 mac_algo_l; + u32 mac_algo_h; + u32 aead_algo; + + /* Maximum length of cipher key */ + u32 max_cipher_key_len; + /* Maximum length of authenticated key */ + u32 max_auth_key_len; + /* Maximum size of per request */ + u64 max_size; + + /* Control VQ buffers: protected by the ctrl_lock */ + struct virtio_crypto_op_ctrl_req ctrl; + struct virtio_crypto_session_input input; + struct virtio_crypto_inhdr ctrl_status; + + unsigned long status; + atomic_t ref_count; + struct list_head list; + struct module *owner; + uint8_t dev_id; + + /* Does the affinity hint is set for virtqueues? */ + bool affinity_hint_set; +}; + +struct virtio_crypto_sym_session_info { + /* Backend session id, which come from the host side */ + __u64 session_id; +}; + +struct virtio_crypto_request; +typedef void (*virtio_crypto_data_callback) + (struct virtio_crypto_request *vc_req, int len); + +struct virtio_crypto_request { + uint8_t status; + struct virtio_crypto_op_data_req *req_data; + struct scatterlist **sgs; + struct data_queue *dataq; + virtio_crypto_data_callback alg_cb; +}; + +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev); +struct list_head *virtcrypto_devmgr_get_head(void); +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev); +struct virtio_crypto *virtcrypto_devmgr_get_first(void); +int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev); +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev); +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev); +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev); +bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto_dev, + uint32_t service, + uint32_t algo); +struct virtio_crypto *virtcrypto_get_dev_node(int node, + uint32_t service, + uint32_t algo); +int virtcrypto_dev_start(struct virtio_crypto *vcrypto); +void virtcrypto_dev_stop(struct virtio_crypto *vcrypto); +int virtio_crypto_ablkcipher_crypt_req( + struct crypto_engine *engine, void *vreq); + +void +virtcrypto_clear_request(struct virtio_crypto_request *vc_req); + +static inline int virtio_crypto_get_current_node(void) +{ + int cpu, node; + + cpu = get_cpu(); + node = topology_physical_package_id(cpu); + put_cpu(); + + return node; +} + +int virtio_crypto_algs_register(struct virtio_crypto *vcrypto); +void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto); + +#endif /* _VIRTIO_CRYPTO_COMMON_H */ diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c new file mode 100644 index 000000000..3c9e12028 --- /dev/null +++ b/drivers/crypto/virtio/virtio_crypto_core.c @@ -0,0 +1,542 @@ + /* Driver for Virtio crypto device. + * + * 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/err.h> +#include <linux/module.h> +#include <linux/virtio_config.h> +#include <linux/cpu.h> + +#include <uapi/linux/virtio_crypto.h> +#include "virtio_crypto_common.h" + + +void +virtcrypto_clear_request(struct virtio_crypto_request *vc_req) +{ + if (vc_req) { + kzfree(vc_req->req_data); + kfree(vc_req->sgs); + } +} + +static void virtcrypto_dataq_callback(struct virtqueue *vq) +{ + struct virtio_crypto *vcrypto = vq->vdev->priv; + struct virtio_crypto_request *vc_req; + unsigned long flags; + unsigned int len; + unsigned int qid = vq->index; + + spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags); + do { + virtqueue_disable_cb(vq); + while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) { + spin_unlock_irqrestore( + &vcrypto->data_vq[qid].lock, flags); + if (vc_req->alg_cb) + vc_req->alg_cb(vc_req, len); + spin_lock_irqsave( + &vcrypto->data_vq[qid].lock, flags); + } + } while (!virtqueue_enable_cb(vq)); + spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags); +} + +static int virtcrypto_find_vqs(struct virtio_crypto *vi) +{ + vq_callback_t **callbacks; + struct virtqueue **vqs; + int ret = -ENOMEM; + int i, total_vqs; + const char **names; + struct device *dev = &vi->vdev->dev; + + /* + * We expect 1 data virtqueue, followed by + * possible N-1 data queues used in multiqueue mode, + * followed by control vq. + */ + total_vqs = vi->max_data_queues + 1; + + /* Allocate space for find_vqs parameters */ + vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); + if (!vqs) + goto err_vq; + callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL); + if (!callbacks) + goto err_callback; + names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL); + if (!names) + goto err_names; + + /* Parameters for control virtqueue */ + callbacks[total_vqs - 1] = NULL; + names[total_vqs - 1] = "controlq"; + + /* Allocate/initialize parameters for data virtqueues */ + for (i = 0; i < vi->max_data_queues; i++) { + callbacks[i] = virtcrypto_dataq_callback; + snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name), + "dataq.%d", i); + names[i] = vi->data_vq[i].name; + } + + ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL); + if (ret) + goto err_find; + + vi->ctrl_vq = vqs[total_vqs - 1]; + + for (i = 0; i < vi->max_data_queues; i++) { + spin_lock_init(&vi->data_vq[i].lock); + vi->data_vq[i].vq = vqs[i]; + /* Initialize crypto engine */ + vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1); + if (!vi->data_vq[i].engine) { + ret = -ENOMEM; + goto err_engine; + } + } + + kfree(names); + kfree(callbacks); + kfree(vqs); + + return 0; + +err_engine: +err_find: + kfree(names); +err_names: + kfree(callbacks); +err_callback: + kfree(vqs); +err_vq: + return ret; +} + +static int virtcrypto_alloc_queues(struct virtio_crypto *vi) +{ + vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq), + GFP_KERNEL); + if (!vi->data_vq) + return -ENOMEM; + + return 0; +} + +static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu) +{ + int i; + + if (vi->affinity_hint_set) { + for (i = 0; i < vi->max_data_queues; i++) + virtqueue_set_affinity(vi->data_vq[i].vq, NULL); + + vi->affinity_hint_set = false; + } +} + +static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto) +{ + int i = 0; + int cpu; + + /* + * In single queue mode, we don't set the cpu affinity. + */ + if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) { + virtcrypto_clean_affinity(vcrypto, -1); + return; + } + + /* + * In multiqueue mode, we let the queue to be private to one cpu + * by setting the affinity hint to eliminate the contention. + * + * TODO: adds cpu hotplug support by register cpu notifier. + * + */ + for_each_online_cpu(cpu) { + virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu)); + if (++i >= vcrypto->max_data_queues) + break; + } + + vcrypto->affinity_hint_set = true; +} + +static void virtcrypto_free_queues(struct virtio_crypto *vi) +{ + kfree(vi->data_vq); +} + +static int virtcrypto_init_vqs(struct virtio_crypto *vi) +{ + int ret; + + /* Allocate send & receive queues */ + ret = virtcrypto_alloc_queues(vi); + if (ret) + goto err; + + ret = virtcrypto_find_vqs(vi); + if (ret) + goto err_free; + + get_online_cpus(); + virtcrypto_set_affinity(vi); + put_online_cpus(); + + return 0; + +err_free: + virtcrypto_free_queues(vi); +err: + return ret; +} + +static int virtcrypto_update_status(struct virtio_crypto *vcrypto) +{ + u32 status; + int err; + + virtio_cread(vcrypto->vdev, + struct virtio_crypto_config, status, &status); + + /* + * Unknown status bits would be a host error and the driver + * should consider the device to be broken. + */ + if (status & (~VIRTIO_CRYPTO_S_HW_READY)) { + dev_warn(&vcrypto->vdev->dev, + "Unknown status bits: 0x%x\n", status); + + virtio_break_device(vcrypto->vdev); + return -EPERM; + } + + if (vcrypto->status == status) + return 0; + + vcrypto->status = status; + + if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) { + err = virtcrypto_dev_start(vcrypto); + if (err) { + dev_err(&vcrypto->vdev->dev, + "Failed to start virtio crypto device.\n"); + + return -EPERM; + } + dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n"); + } else { + virtcrypto_dev_stop(vcrypto); + dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n"); + } + + return 0; +} + +static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto) +{ + int32_t i; + int ret; + + for (i = 0; i < vcrypto->max_data_queues; i++) { + if (vcrypto->data_vq[i].engine) { + ret = crypto_engine_start(vcrypto->data_vq[i].engine); + if (ret) + goto err; + } + } + + return 0; + +err: + while (--i >= 0) + if (vcrypto->data_vq[i].engine) + crypto_engine_exit(vcrypto->data_vq[i].engine); + + return ret; +} + +static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto) +{ + u32 i; + + for (i = 0; i < vcrypto->max_data_queues; i++) + if (vcrypto->data_vq[i].engine) + crypto_engine_exit(vcrypto->data_vq[i].engine); +} + +static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto) +{ + struct virtio_device *vdev = vcrypto->vdev; + + virtcrypto_clean_affinity(vcrypto, -1); + + vdev->config->del_vqs(vdev); + + virtcrypto_free_queues(vcrypto); +} + +static int virtcrypto_probe(struct virtio_device *vdev) +{ + int err = -EFAULT; + struct virtio_crypto *vcrypto; + u32 max_data_queues = 0, max_cipher_key_len = 0; + u32 max_auth_key_len = 0; + u64 max_size = 0; + u32 cipher_algo_l = 0; + u32 cipher_algo_h = 0; + u32 hash_algo = 0; + u32 mac_algo_l = 0; + u32 mac_algo_h = 0; + u32 aead_algo = 0; + u32 crypto_services = 0; + + if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) + return -ENODEV; + + if (!vdev->config->get) { + dev_err(&vdev->dev, "%s failure: config access disabled\n", + __func__); + return -EINVAL; + } + + if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) { + /* + * If the accelerator is connected to a node with no memory + * there is no point in using the accelerator since the remote + * memory transaction will be very slow. + */ + dev_err(&vdev->dev, "Invalid NUMA configuration.\n"); + return -EINVAL; + } + + vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL, + dev_to_node(&vdev->dev)); + if (!vcrypto) + return -ENOMEM; + + virtio_cread(vdev, struct virtio_crypto_config, + max_dataqueues, &max_data_queues); + if (max_data_queues < 1) + max_data_queues = 1; + + virtio_cread(vdev, struct virtio_crypto_config, + max_cipher_key_len, &max_cipher_key_len); + virtio_cread(vdev, struct virtio_crypto_config, + max_auth_key_len, &max_auth_key_len); + virtio_cread(vdev, struct virtio_crypto_config, + max_size, &max_size); + virtio_cread(vdev, struct virtio_crypto_config, + crypto_services, &crypto_services); + virtio_cread(vdev, struct virtio_crypto_config, + cipher_algo_l, &cipher_algo_l); + virtio_cread(vdev, struct virtio_crypto_config, + cipher_algo_h, &cipher_algo_h); + virtio_cread(vdev, struct virtio_crypto_config, + hash_algo, &hash_algo); + virtio_cread(vdev, struct virtio_crypto_config, + mac_algo_l, &mac_algo_l); + virtio_cread(vdev, struct virtio_crypto_config, + mac_algo_h, &mac_algo_h); + virtio_cread(vdev, struct virtio_crypto_config, + aead_algo, &aead_algo); + + /* Add virtio crypto device to global table */ + err = virtcrypto_devmgr_add_dev(vcrypto); + if (err) { + dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n"); + goto free; + } + vcrypto->owner = THIS_MODULE; + vcrypto = vdev->priv = vcrypto; + vcrypto->vdev = vdev; + + spin_lock_init(&vcrypto->ctrl_lock); + + /* Use single data queue as default */ + vcrypto->curr_queue = 1; + vcrypto->max_data_queues = max_data_queues; + vcrypto->max_cipher_key_len = max_cipher_key_len; + vcrypto->max_auth_key_len = max_auth_key_len; + vcrypto->max_size = max_size; + vcrypto->crypto_services = crypto_services; + vcrypto->cipher_algo_l = cipher_algo_l; + vcrypto->cipher_algo_h = cipher_algo_h; + vcrypto->mac_algo_l = mac_algo_l; + vcrypto->mac_algo_h = mac_algo_h; + vcrypto->hash_algo = hash_algo; + vcrypto->aead_algo = aead_algo; + + + dev_info(&vdev->dev, + "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n", + vcrypto->max_data_queues, + vcrypto->max_cipher_key_len, + vcrypto->max_auth_key_len, + vcrypto->max_size); + + err = virtcrypto_init_vqs(vcrypto); + if (err) { + dev_err(&vdev->dev, "Failed to initialize vqs.\n"); + goto free_dev; + } + + err = virtcrypto_start_crypto_engines(vcrypto); + if (err) + goto free_vqs; + + virtio_device_ready(vdev); + + err = virtcrypto_update_status(vcrypto); + if (err) + goto free_engines; + + return 0; + +free_engines: + virtcrypto_clear_crypto_engines(vcrypto); +free_vqs: + vcrypto->vdev->config->reset(vdev); + virtcrypto_del_vqs(vcrypto); +free_dev: + virtcrypto_devmgr_rm_dev(vcrypto); +free: + kfree(vcrypto); + return err; +} + +static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto) +{ + struct virtio_crypto_request *vc_req; + int i; + struct virtqueue *vq; + + for (i = 0; i < vcrypto->max_data_queues; i++) { + vq = vcrypto->data_vq[i].vq; + while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) { + kfree(vc_req->req_data); + kfree(vc_req->sgs); + } + } +} + +static void virtcrypto_remove(struct virtio_device *vdev) +{ + struct virtio_crypto *vcrypto = vdev->priv; + + dev_info(&vdev->dev, "Start virtcrypto_remove.\n"); + + if (virtcrypto_dev_started(vcrypto)) + virtcrypto_dev_stop(vcrypto); + vdev->config->reset(vdev); + virtcrypto_free_unused_reqs(vcrypto); + virtcrypto_clear_crypto_engines(vcrypto); + virtcrypto_del_vqs(vcrypto); + virtcrypto_devmgr_rm_dev(vcrypto); + kfree(vcrypto); +} + +static void virtcrypto_config_changed(struct virtio_device *vdev) +{ + struct virtio_crypto *vcrypto = vdev->priv; + + virtcrypto_update_status(vcrypto); +} + +#ifdef CONFIG_PM_SLEEP +static int virtcrypto_freeze(struct virtio_device *vdev) +{ + struct virtio_crypto *vcrypto = vdev->priv; + + vdev->config->reset(vdev); + virtcrypto_free_unused_reqs(vcrypto); + if (virtcrypto_dev_started(vcrypto)) + virtcrypto_dev_stop(vcrypto); + + virtcrypto_clear_crypto_engines(vcrypto); + virtcrypto_del_vqs(vcrypto); + return 0; +} + +static int virtcrypto_restore(struct virtio_device *vdev) +{ + struct virtio_crypto *vcrypto = vdev->priv; + int err; + + err = virtcrypto_init_vqs(vcrypto); + if (err) + return err; + + err = virtcrypto_start_crypto_engines(vcrypto); + if (err) + goto free_vqs; + + virtio_device_ready(vdev); + + err = virtcrypto_dev_start(vcrypto); + if (err) { + dev_err(&vdev->dev, "Failed to start virtio crypto device.\n"); + goto free_engines; + } + + return 0; + +free_engines: + virtcrypto_clear_crypto_engines(vcrypto); +free_vqs: + vcrypto->vdev->config->reset(vdev); + virtcrypto_del_vqs(vcrypto); + return err; +} +#endif + +static unsigned int features[] = { + /* none */ +}; + +static struct virtio_device_id id_table[] = { + { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID }, + { 0 }, +}; + +static struct virtio_driver virtio_crypto_driver = { + .driver.name = KBUILD_MODNAME, + .driver.owner = THIS_MODULE, + .feature_table = features, + .feature_table_size = ARRAY_SIZE(features), + .id_table = id_table, + .probe = virtcrypto_probe, + .remove = virtcrypto_remove, + .config_changed = virtcrypto_config_changed, +#ifdef CONFIG_PM_SLEEP + .freeze = virtcrypto_freeze, + .restore = virtcrypto_restore, +#endif +}; + +module_virtio_driver(virtio_crypto_driver); + +MODULE_DEVICE_TABLE(virtio, id_table); +MODULE_DESCRIPTION("virtio crypto device driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>"); diff --git a/drivers/crypto/virtio/virtio_crypto_mgr.c b/drivers/crypto/virtio/virtio_crypto_mgr.c new file mode 100644 index 000000000..d70de3a4f --- /dev/null +++ b/drivers/crypto/virtio/virtio_crypto_mgr.c @@ -0,0 +1,333 @@ + /* 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> +#include <linux/list.h> +#include <linux/module.h> + +#include <uapi/linux/virtio_crypto.h> +#include "virtio_crypto_common.h" + +static LIST_HEAD(virtio_crypto_table); +static uint32_t num_devices; + +/* The table_lock protects the above global list and num_devices */ +static DEFINE_MUTEX(table_lock); + +#define VIRTIO_CRYPTO_MAX_DEVICES 32 + + +/* + * virtcrypto_devmgr_add_dev() - Add vcrypto_dev to the acceleration + * framework. + * @vcrypto_dev: Pointer to virtio crypto device. + * + * Function adds virtio crypto device to the global list. + * To be used by virtio crypto device specific drivers. + * + * Return: 0 on success, error code othewise. + */ +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev) +{ + struct list_head *itr; + + mutex_lock(&table_lock); + if (num_devices == VIRTIO_CRYPTO_MAX_DEVICES) { + pr_info("virtio_crypto: only support up to %d devices\n", + VIRTIO_CRYPTO_MAX_DEVICES); + mutex_unlock(&table_lock); + return -EFAULT; + } + + list_for_each(itr, &virtio_crypto_table) { + struct virtio_crypto *ptr = + list_entry(itr, struct virtio_crypto, list); + + if (ptr == vcrypto_dev) { + mutex_unlock(&table_lock); + return -EEXIST; + } + } + atomic_set(&vcrypto_dev->ref_count, 0); + list_add_tail(&vcrypto_dev->list, &virtio_crypto_table); + vcrypto_dev->dev_id = num_devices++; + mutex_unlock(&table_lock); + return 0; +} + +struct list_head *virtcrypto_devmgr_get_head(void) +{ + return &virtio_crypto_table; +} + +/* + * virtcrypto_devmgr_rm_dev() - Remove vcrypto_dev from the acceleration + * framework. + * @vcrypto_dev: Pointer to virtio crypto device. + * + * Function removes virtio crypto device from the acceleration framework. + * To be used by virtio crypto device specific drivers. + * + * Return: void + */ +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev) +{ + mutex_lock(&table_lock); + list_del(&vcrypto_dev->list); + num_devices--; + mutex_unlock(&table_lock); +} + +/* + * 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. + * + * Increment the vcrypto_dev refcount and if this is the first time + * incrementing it during this period the vcrypto_dev is in use, + * increment the module refcount too. + * To be used by virtio crypto device specific drivers. + * + * Return: 0 when successful, EFAULT when fail to bump module refcount + */ +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev) +{ + if (atomic_add_return(1, &vcrypto_dev->ref_count) == 1) + if (!try_module_get(vcrypto_dev->owner)) + return -EFAULT; + return 0; +} + +/* + * virtcrypto_dev_put() - Decrement vcrypto_dev reference count + * @vcrypto_dev: Pointer to virtio crypto device. + * + * Decrement the vcrypto_dev refcount and if this is the last time + * decrementing it during this period the vcrypto_dev is in use, + * decrement the module refcount too. + * To be used by virtio crypto device specific drivers. + * + * Return: void + */ +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev) +{ + if (atomic_sub_return(1, &vcrypto_dev->ref_count) == 0) + module_put(vcrypto_dev->owner); +} + +/* + * virtcrypto_dev_started() - Check whether device has started + * @vcrypto_dev: Pointer to virtio crypto device. + * + * To be used by virtio crypto device specific drivers. + * + * Return: 1 when the device has started, 0 otherwise + */ +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev) +{ + return (vcrypto_dev->status & VIRTIO_CRYPTO_S_HW_READY); +} + +/* + * 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, + * 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, uint32_t service, + uint32_t algo) +{ + struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev; + unsigned long best = ~0; + unsigned long ctr; + + mutex_lock(&table_lock); + list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) { + + if ((node == dev_to_node(&tmp_dev->vdev->dev) || + dev_to_node(&tmp_dev->vdev->dev) < 0) && + 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; + best = ctr; + } + } + } + + if (!vcrypto_dev) { + pr_info("virtio_crypto: Could not find a device on node %d\n", + node); + /* Get any started device */ + list_for_each_entry(tmp_dev, + virtcrypto_devmgr_get_head(), list) { + if (virtcrypto_dev_started(tmp_dev) && + virtcrypto_algo_is_supported(tmp_dev, + service, algo)) { + vcrypto_dev = tmp_dev; + break; + } + } + } + mutex_unlock(&table_lock); + if (!vcrypto_dev) + return NULL; + + virtcrypto_dev_get(vcrypto_dev); + return vcrypto_dev; +} + +/* + * virtcrypto_dev_start() - Start virtio crypto device + * @vcrypto: Pointer to virtio crypto device. + * + * Function notifies all the registered services that the virtio crypto device + * is ready to be used. + * To be used by virtio crypto device specific drivers. + * + * Return: 0 on success, EFAULT when fail to register algorithms + */ +int virtcrypto_dev_start(struct virtio_crypto *vcrypto) +{ + if (virtio_crypto_algs_register(vcrypto)) { + pr_err("virtio_crypto: Failed to register crypto algs\n"); + return -EFAULT; + } + + return 0; +} + +/* + * virtcrypto_dev_stop() - Stop virtio crypto device + * @vcrypto: Pointer to virtio crypto device. + * + * Function notifies all the registered services that the virtio crypto device + * is ready to 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(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; + } + + if (!(algo_mask & (1u << algo))) + return false; + + return true; +} |