static void virtblk_done(struct virtqueue *vq)
{
struct virtio_blk *vblk = vq->vdev->priv;
bool req_done = false;
int qid = vq->index;
struct virtblk_req *vbr;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
do {
virtqueue_disable_cb(vq);
while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
blk_mq_complete_request(vbr->req, vbr->req->errors);
req_done = true;
}
if (unlikely(virtqueue_is_broken(vq)))
break;
} while (!virtqueue_enable_cb(vq));
/* In case queue is stopped waiting for more buffers. */
if (req_done)
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
}
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_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;
}