2016-12-15 10:03:16 +08:00
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/* Driver for Virtio crypto device.
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*
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* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/virtio_config.h>
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#include <linux/cpu.h>
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#include <uapi/linux/virtio_crypto.h>
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#include "virtio_crypto_common.h"
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2016-12-27 14:49:07 +08:00
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void
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2016-12-15 10:03:16 +08:00
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virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
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{
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if (vc_req) {
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kzfree(vc_req->req_data);
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kfree(vc_req->sgs);
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}
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}
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static void virtcrypto_dataq_callback(struct virtqueue *vq)
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{
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struct virtio_crypto *vcrypto = vq->vdev->priv;
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struct virtio_crypto_request *vc_req;
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unsigned long flags;
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unsigned int len;
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unsigned int qid = vq->index;
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spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
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do {
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virtqueue_disable_cb(vq);
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while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
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2017-06-23 23:31:19 +08:00
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spin_unlock_irqrestore(
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&vcrypto->data_vq[qid].lock, flags);
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if (vc_req->alg_cb)
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vc_req->alg_cb(vc_req, len);
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spin_lock_irqsave(
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&vcrypto->data_vq[qid].lock, flags);
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2016-12-15 10:03:16 +08:00
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}
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} while (!virtqueue_enable_cb(vq));
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spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
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}
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static int virtcrypto_find_vqs(struct virtio_crypto *vi)
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{
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vq_callback_t **callbacks;
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struct virtqueue **vqs;
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int ret = -ENOMEM;
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int i, total_vqs;
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const char **names;
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2016-12-27 14:49:07 +08:00
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struct device *dev = &vi->vdev->dev;
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2016-12-15 10:03:16 +08:00
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/*
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* We expect 1 data virtqueue, followed by
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* possible N-1 data queues used in multiqueue mode,
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* followed by control vq.
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*/
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total_vqs = vi->max_data_queues + 1;
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/* Allocate space for find_vqs parameters */
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vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
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if (!vqs)
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goto err_vq;
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callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
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if (!callbacks)
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goto err_callback;
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names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
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if (!names)
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goto err_names;
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/* Parameters for control virtqueue */
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callbacks[total_vqs - 1] = NULL;
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names[total_vqs - 1] = "controlq";
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/* Allocate/initialize parameters for data virtqueues */
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for (i = 0; i < vi->max_data_queues; i++) {
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callbacks[i] = virtcrypto_dataq_callback;
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snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
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"dataq.%d", i);
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names[i] = vi->data_vq[i].name;
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}
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2017-03-07 00:19:39 +08:00
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ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
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2016-12-15 10:03:16 +08:00
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if (ret)
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goto err_find;
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vi->ctrl_vq = vqs[total_vqs - 1];
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for (i = 0; i < vi->max_data_queues; i++) {
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spin_lock_init(&vi->data_vq[i].lock);
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vi->data_vq[i].vq = vqs[i];
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2016-12-27 14:49:07 +08:00
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/* Initialize crypto engine */
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vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
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if (!vi->data_vq[i].engine) {
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ret = -ENOMEM;
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goto err_engine;
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}
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vi->data_vq[i].engine->cipher_one_request =
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virtio_crypto_ablkcipher_crypt_req;
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2016-12-15 10:03:16 +08:00
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}
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kfree(names);
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kfree(callbacks);
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kfree(vqs);
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return 0;
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2016-12-27 14:49:07 +08:00
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err_engine:
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2016-12-15 10:03:16 +08:00
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err_find:
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kfree(names);
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err_names:
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kfree(callbacks);
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err_callback:
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kfree(vqs);
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err_vq:
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return ret;
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}
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static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
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{
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vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
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GFP_KERNEL);
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if (!vi->data_vq)
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return -ENOMEM;
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return 0;
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}
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static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
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{
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int i;
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if (vi->affinity_hint_set) {
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for (i = 0; i < vi->max_data_queues; i++)
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virtqueue_set_affinity(vi->data_vq[i].vq, -1);
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vi->affinity_hint_set = false;
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}
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}
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static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
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{
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int i = 0;
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int cpu;
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/*
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* In single queue mode, we don't set the cpu affinity.
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*/
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if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
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virtcrypto_clean_affinity(vcrypto, -1);
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return;
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}
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/*
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* In multiqueue mode, we let the queue to be private to one cpu
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* by setting the affinity hint to eliminate the contention.
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*
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* TODO: adds cpu hotplug support by register cpu notifier.
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*
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*/
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for_each_online_cpu(cpu) {
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virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
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if (++i >= vcrypto->max_data_queues)
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break;
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}
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vcrypto->affinity_hint_set = true;
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}
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static void virtcrypto_free_queues(struct virtio_crypto *vi)
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{
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kfree(vi->data_vq);
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}
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static int virtcrypto_init_vqs(struct virtio_crypto *vi)
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{
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int ret;
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/* Allocate send & receive queues */
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ret = virtcrypto_alloc_queues(vi);
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if (ret)
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goto err;
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ret = virtcrypto_find_vqs(vi);
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if (ret)
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goto err_free;
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get_online_cpus();
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virtcrypto_set_affinity(vi);
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put_online_cpus();
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return 0;
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err_free:
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virtcrypto_free_queues(vi);
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err:
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return ret;
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}
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static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
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{
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u32 status;
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int err;
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virtio_cread(vcrypto->vdev,
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struct virtio_crypto_config, status, &status);
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/*
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* Unknown status bits would be a host error and the driver
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* should consider the device to be broken.
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*/
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if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
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dev_warn(&vcrypto->vdev->dev,
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"Unknown status bits: 0x%x\n", status);
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virtio_break_device(vcrypto->vdev);
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return -EPERM;
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}
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if (vcrypto->status == status)
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return 0;
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vcrypto->status = status;
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if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
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err = virtcrypto_dev_start(vcrypto);
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if (err) {
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dev_err(&vcrypto->vdev->dev,
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"Failed to start virtio crypto device.\n");
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return -EPERM;
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}
|
2017-06-23 23:31:19 +08:00
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dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
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2016-12-15 10:03:16 +08:00
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} else {
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virtcrypto_dev_stop(vcrypto);
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dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
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}
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return 0;
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}
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2016-12-27 14:49:07 +08:00
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static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
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{
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int32_t i;
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int ret;
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for (i = 0; i < vcrypto->max_data_queues; i++) {
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if (vcrypto->data_vq[i].engine) {
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ret = crypto_engine_start(vcrypto->data_vq[i].engine);
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if (ret)
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goto err;
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}
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}
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return 0;
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err:
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while (--i >= 0)
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if (vcrypto->data_vq[i].engine)
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crypto_engine_exit(vcrypto->data_vq[i].engine);
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return ret;
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}
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static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
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{
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u32 i;
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for (i = 0; i < vcrypto->max_data_queues; i++)
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if (vcrypto->data_vq[i].engine)
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crypto_engine_exit(vcrypto->data_vq[i].engine);
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}
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2016-12-15 10:03:16 +08:00
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static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
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{
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struct virtio_device *vdev = vcrypto->vdev;
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virtcrypto_clean_affinity(vcrypto, -1);
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vdev->config->del_vqs(vdev);
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virtcrypto_free_queues(vcrypto);
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}
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static int virtcrypto_probe(struct virtio_device *vdev)
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{
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int err = -EFAULT;
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struct virtio_crypto *vcrypto;
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u32 max_data_queues = 0, max_cipher_key_len = 0;
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u32 max_auth_key_len = 0;
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u64 max_size = 0;
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if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
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return -ENODEV;
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if (!vdev->config->get) {
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dev_err(&vdev->dev, "%s failure: config access disabled\n",
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__func__);
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return -EINVAL;
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}
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if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
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/*
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* If the accelerator is connected to a node with no memory
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* there is no point in using the accelerator since the remote
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* memory transaction will be very slow.
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*/
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dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
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return -EINVAL;
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}
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vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
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dev_to_node(&vdev->dev));
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if (!vcrypto)
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return -ENOMEM;
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virtio_cread(vdev, struct virtio_crypto_config,
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max_dataqueues, &max_data_queues);
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if (max_data_queues < 1)
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max_data_queues = 1;
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virtio_cread(vdev, struct virtio_crypto_config,
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max_cipher_key_len, &max_cipher_key_len);
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virtio_cread(vdev, struct virtio_crypto_config,
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max_auth_key_len, &max_auth_key_len);
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virtio_cread(vdev, struct virtio_crypto_config,
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max_size, &max_size);
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/* Add virtio crypto device to global table */
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err = virtcrypto_devmgr_add_dev(vcrypto);
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if (err) {
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dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
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goto free;
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}
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vcrypto->owner = THIS_MODULE;
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vcrypto = vdev->priv = vcrypto;
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vcrypto->vdev = vdev;
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spin_lock_init(&vcrypto->ctrl_lock);
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/* Use single data queue as default */
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vcrypto->curr_queue = 1;
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vcrypto->max_data_queues = max_data_queues;
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vcrypto->max_cipher_key_len = max_cipher_key_len;
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vcrypto->max_auth_key_len = max_auth_key_len;
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vcrypto->max_size = max_size;
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dev_info(&vdev->dev,
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"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
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|
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vcrypto->max_data_queues,
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|
|
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;
|
|
|
|
}
|
2016-12-27 14:49:07 +08:00
|
|
|
|
|
|
|
err = virtcrypto_start_crypto_engines(vcrypto);
|
|
|
|
if (err)
|
|
|
|
goto free_vqs;
|
|
|
|
|
2016-12-15 10:03:16 +08:00
|
|
|
virtio_device_ready(vdev);
|
|
|
|
|
|
|
|
err = virtcrypto_update_status(vcrypto);
|
|
|
|
if (err)
|
2016-12-27 14:49:07 +08:00
|
|
|
goto free_engines;
|
2016-12-15 10:03:16 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
free_engines:
|
|
|
|
virtcrypto_clear_crypto_engines(vcrypto);
|
2016-12-15 10:03:16 +08:00
|
|
|
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);
|
2016-12-27 14:49:07 +08:00
|
|
|
virtcrypto_clear_crypto_engines(vcrypto);
|
2016-12-15 10:03:16 +08:00
|
|
|
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);
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
virtcrypto_clear_crypto_engines(vcrypto);
|
2016-12-15 10:03:16 +08:00
|
|
|
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;
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
err = virtcrypto_start_crypto_engines(vcrypto);
|
|
|
|
if (err)
|
|
|
|
goto free_vqs;
|
|
|
|
|
2016-12-15 10:03:16 +08:00
|
|
|
virtio_device_ready(vdev);
|
2016-12-27 14:49:07 +08:00
|
|
|
|
2016-12-15 10:03:16 +08:00
|
|
|
err = virtcrypto_dev_start(vcrypto);
|
|
|
|
if (err) {
|
|
|
|
dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
|
2016-12-27 14:49:07 +08:00
|
|
|
goto free_engines;
|
2016-12-15 10:03:16 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2016-12-27 14:49:07 +08:00
|
|
|
|
|
|
|
free_engines:
|
|
|
|
virtcrypto_clear_crypto_engines(vcrypto);
|
|
|
|
free_vqs:
|
|
|
|
vcrypto->vdev->config->reset(vdev);
|
|
|
|
virtcrypto_del_vqs(vcrypto);
|
|
|
|
return err;
|
2016-12-15 10:03:16 +08:00
|
|
|
}
|
|
|
|
#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>");
|