[mirror_ubuntu-artful-kernel.git] / drivers / crypto / virtio / virtio_crypto_core.c

 /* 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->iv);
		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;
	struct ablkcipher_request *ablk_req;
	int error;
	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) {
			if (vc_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_req->ablkcipher_req;

				spin_unlock_irqrestore(
					&vcrypto->data_vq[qid].lock, flags);
				/* Finish the encrypt or decrypt process */
				virtio_crypto_ablkcipher_finalize_req(vc_req,
				    ablk_req, error);
				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 = vi->vdev->config->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;
		}

		vi->data_vq[i].engine->cipher_one_request =
			virtio_crypto_ablkcipher_crypt_req;
	}

	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, -1);

		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, 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 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;

	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);

	/* 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;

	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>");
Commit	Line	Data
dbaf0624 G	1	/* Driver for Virtio crypto device.
	2	*
	3	* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	#include <linux/err.h>
	20	#include <linux/module.h>
	21	#include <linux/virtio_config.h>
	22	#include <linux/cpu.h>
	23
	24	#include <uapi/linux/virtio_crypto.h>
	25	#include "virtio_crypto_common.h"
	26
	27
d79b5d0b	28	void
dbaf0624 G	29	virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
	30	{
	31	if (vc_req) {
	32	kzfree(vc_req->iv);
	33	kzfree(vc_req->req_data);
	34	kfree(vc_req->sgs);
	35	}
	36	}
	37
	38	static void virtcrypto_dataq_callback(struct virtqueue *vq)
	39	{
	40	struct virtio_crypto *vcrypto = vq->vdev->priv;
	41	struct virtio_crypto_request *vc_req;
	42	unsigned long flags;
	43	unsigned int len;
	44	struct ablkcipher_request *ablk_req;
	45	int error;
	46	unsigned int qid = vq->index;
	47
	48	spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
	49	do {
	50	virtqueue_disable_cb(vq);
	51	while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
	52	if (vc_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
	53	switch (vc_req->status) {
	54	case VIRTIO_CRYPTO_OK:
	55	error = 0;
	56	break;
	57	case VIRTIO_CRYPTO_INVSESS:
	58	case VIRTIO_CRYPTO_ERR:
	59	error = -EINVAL;
	60	break;
	61	case VIRTIO_CRYPTO_BADMSG:
	62	error = -EBADMSG;
	63	break;
	64	default:
	65	error = -EIO;
	66	break;
	67	}
	68	ablk_req = vc_req->ablkcipher_req;
dbaf0624 G	69
	70	spin_unlock_irqrestore(
	71	&vcrypto->data_vq[qid].lock, flags);
	72	/* Finish the encrypt or decrypt process */
d79b5d0b GA	73	virtio_crypto_ablkcipher_finalize_req(vc_req,
d79b5d0b GA	74	ablk_req, error);
dbaf0624 G	75	spin_lock_irqsave(
	76	&vcrypto->data_vq[qid].lock, flags);
	77	}
	78	}
	79	} while (!virtqueue_enable_cb(vq));
	80	spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
	81	}
	82
	83	static int virtcrypto_find_vqs(struct virtio_crypto *vi)
	84	{
	85	vq_callback_t **callbacks;
	86	struct virtqueue **vqs;
	87	int ret = -ENOMEM;
	88	int i, total_vqs;
	89	const char **names;
d79b5d0b	90	struct device *dev = &vi->vdev->dev;
dbaf0624 G	91
	92	/*
	93	* We expect 1 data virtqueue, followed by
	94	* possible N-1 data queues used in multiqueue mode,
	95	* followed by control vq.
	96	*/
	97	total_vqs = vi->max_data_queues + 1;
	98
	99	/* Allocate space for find_vqs parameters */
	100	vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
	101	if (!vqs)
	102	goto err_vq;
	103	callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
	104	if (!callbacks)
	105	goto err_callback;
	106	names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
	107	if (!names)
	108	goto err_names;
	109
	110	/* Parameters for control virtqueue */
	111	callbacks[total_vqs - 1] = NULL;
	112	names[total_vqs - 1] = "controlq";
	113
	114	/* Allocate/initialize parameters for data virtqueues */
	115	for (i = 0; i < vi->max_data_queues; i++) {
	116	callbacks[i] = virtcrypto_dataq_callback;
	117	snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
	118	"dataq.%d", i);
	119	names[i] = vi->data_vq[i].name;
	120	}
	121
	122	ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
fb5e31d9	123	names, NULL);
dbaf0624 G	124	if (ret)
	125	goto err_find;
	126
	127	vi->ctrl_vq = vqs[total_vqs - 1];
	128
	129	for (i = 0; i < vi->max_data_queues; i++) {
	130	spin_lock_init(&vi->data_vq[i].lock);
	131	vi->data_vq[i].vq = vqs[i];
d79b5d0b GA	132	/* Initialize crypto engine */
	133	vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
	134	if (!vi->data_vq[i].engine) {
	135	ret = -ENOMEM;
	136	goto err_engine;
	137	}
	138
	139	vi->data_vq[i].engine->cipher_one_request =
	140	virtio_crypto_ablkcipher_crypt_req;
dbaf0624 G	141	}
	142
	143	kfree(names);
	144	kfree(callbacks);
	145	kfree(vqs);
	146
	147	return 0;
	148
d79b5d0b	149	err_engine:
dbaf0624 G	150	err_find:
	151	kfree(names);
	152	err_names:
	153	kfree(callbacks);
	154	err_callback:
	155	kfree(vqs);
	156	err_vq:
	157	return ret;
	158	}
	159
	160	static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
	161	{
	162	vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
	163	GFP_KERNEL);
	164	if (!vi->data_vq)
	165	return -ENOMEM;
	166
	167	return 0;
	168	}
	169
	170	static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
	171	{
	172	int i;
	173
	174	if (vi->affinity_hint_set) {
	175	for (i = 0; i < vi->max_data_queues; i++)
	176	virtqueue_set_affinity(vi->data_vq[i].vq, -1);
	177
	178	vi->affinity_hint_set = false;
	179	}
	180	}
	181
	182	static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
	183	{
	184	int i = 0;
	185	int cpu;
	186
	187	/*
	188	* In single queue mode, we don't set the cpu affinity.
	189	*/
	190	if (vcrypto->curr_queue == 1 \|\| vcrypto->max_data_queues == 1) {
	191	virtcrypto_clean_affinity(vcrypto, -1);
	192	return;
	193	}
	194
	195	/*
	196	* In multiqueue mode, we let the queue to be private to one cpu
	197	* by setting the affinity hint to eliminate the contention.
	198	*
	199	* TODO: adds cpu hotplug support by register cpu notifier.
	200	*
	201	*/
	202	for_each_online_cpu(cpu) {
	203	virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
	204	if (++i >= vcrypto->max_data_queues)
	205	break;
	206	}
	207
	208	vcrypto->affinity_hint_set = true;
	209	}
	210
	211	static void virtcrypto_free_queues(struct virtio_crypto *vi)
	212	{
	213	kfree(vi->data_vq);
214	}
215
216	static int virtcrypto_init_vqs(struct virtio_crypto *vi)
217	{
218	int ret;
219
220	/* Allocate send & receive queues */
221	ret = virtcrypto_alloc_queues(vi);
222	if (ret)
223	goto err;
224
225	ret = virtcrypto_find_vqs(vi);
226	if (ret)
227	goto err_free;
228
229	get_online_cpus();
230	virtcrypto_set_affinity(vi);
231	put_online_cpus();
232
233	return 0;
234
235	err_free:
236	virtcrypto_free_queues(vi);
237	err:
238	return ret;
239	}
240
241	static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
242	{
243	u32 status;
244	int err;
245
246	virtio_cread(vcrypto->vdev,
247	struct virtio_crypto_config, status, &status);
248
249	/*
250	* Unknown status bits would be a host error and the driver
251	* should consider the device to be broken.
252	*/
253	if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
254	dev_warn(&vcrypto->vdev->dev,
255	"Unknown status bits: 0x%x\n", status);
256
257	virtio_break_device(vcrypto->vdev);
258	return -EPERM;
259	}
260
261	if (vcrypto->status == status)
262	return 0;
263
264	vcrypto->status = status;
265
266	if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
267	err = virtcrypto_dev_start(vcrypto);
268	if (err) {
269	dev_err(&vcrypto->vdev->dev,
270	"Failed to start virtio crypto device.\n");
271
272	return -EPERM;
273	}
274	dev_info(&vcrypto->vdev->dev, "Accelerator is ready\n");
275	} else {
276	virtcrypto_dev_stop(vcrypto);
277	dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
278	}
279
280	return 0;
281	}
282
d79b5d0b GA	283	static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
	284	{
	285	int32_t i;
	286	int ret;
	287
	288	for (i = 0; i < vcrypto->max_data_queues; i++) {
	289	if (vcrypto->data_vq[i].engine) {
	290	ret = crypto_engine_start(vcrypto->data_vq[i].engine);
	291	if (ret)
	292	goto err;
	293	}
	294	}
	295
	296	return 0;
	297
	298	err:
	299	while (--i >= 0)
	300	if (vcrypto->data_vq[i].engine)
	301	crypto_engine_exit(vcrypto->data_vq[i].engine);
	302
	303	return ret;
	304	}
	305
	306	static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
	307	{
	308	u32 i;
	309
	310	for (i = 0; i < vcrypto->max_data_queues; i++)
	311	if (vcrypto->data_vq[i].engine)
	312	crypto_engine_exit(vcrypto->data_vq[i].engine);
	313	}
	314
dbaf0624 G	315	static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
	316	{
	317	struct virtio_device *vdev = vcrypto->vdev;
	318
	319	virtcrypto_clean_affinity(vcrypto, -1);
	320
	321	vdev->config->del_vqs(vdev);
	322
	323	virtcrypto_free_queues(vcrypto);
	324	}
	325
	326	static int virtcrypto_probe(struct virtio_device *vdev)
	327	{
	328	int err = -EFAULT;
	329	struct virtio_crypto *vcrypto;
	330	u32 max_data_queues = 0, max_cipher_key_len = 0;
	331	u32 max_auth_key_len = 0;
	332	u64 max_size = 0;
	333
	334	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
	335	return -ENODEV;
	336
	337	if (!vdev->config->get) {
	338	dev_err(&vdev->dev, "%s failure: config access disabled\n",
	339	__func__);
	340	return -EINVAL;
	341	}
	342
	343	if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
	344	/*
	345	* If the accelerator is connected to a node with no memory
	346	* there is no point in using the accelerator since the remote
	347	* memory transaction will be very slow.
	348	*/
	349	dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
	350	return -EINVAL;
	351	}
	352
	353	vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
	354	dev_to_node(&vdev->dev));
	355	if (!vcrypto)
	356	return -ENOMEM;
	357
	358	virtio_cread(vdev, struct virtio_crypto_config,
	359	max_dataqueues, &max_data_queues);
	360	if (max_data_queues < 1)
	361	max_data_queues = 1;
	362
	363	virtio_cread(vdev, struct virtio_crypto_config,
	364	max_cipher_key_len, &max_cipher_key_len);
	365	virtio_cread(vdev, struct virtio_crypto_config,
	366	max_auth_key_len, &max_auth_key_len);
	367	virtio_cread(vdev, struct virtio_crypto_config,
	368	max_size, &max_size);
	369
	370	/* Add virtio crypto device to global table */
	371	err = virtcrypto_devmgr_add_dev(vcrypto);
	372	if (err) {
	373	dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
	374	goto free;
	375	}
	376	vcrypto->owner = THIS_MODULE;
	377	vcrypto = vdev->priv = vcrypto;
	378	vcrypto->vdev = vdev;
379
380	spin_lock_init(&vcrypto->ctrl_lock);
381
382	/* Use single data queue as default */
383	vcrypto->curr_queue = 1;
384	vcrypto->max_data_queues = max_data_queues;
385	vcrypto->max_cipher_key_len = max_cipher_key_len;
386	vcrypto->max_auth_key_len = max_auth_key_len;
387	vcrypto->max_size = max_size;
388
389	dev_info(&vdev->dev,
390	"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
391	vcrypto->max_data_queues,
392	vcrypto->max_cipher_key_len,
393	vcrypto->max_auth_key_len,
394	vcrypto->max_size);
395
396	err = virtcrypto_init_vqs(vcrypto);
397	if (err) {
398	dev_err(&vdev->dev, "Failed to initialize vqs.\n");
399	goto free_dev;
400	}
d79b5d0b GA	401
	402	err = virtcrypto_start_crypto_engines(vcrypto);
	403	if (err)
	404	goto free_vqs;
	405
dbaf0624 G	406	virtio_device_ready(vdev);
	407
	408	err = virtcrypto_update_status(vcrypto);
	409	if (err)
d79b5d0b	410	goto free_engines;
dbaf0624 G	411
	412	return 0;
	413
d79b5d0b GA	414	free_engines:
d79b5d0b GA	415	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	416	free_vqs:
	417	vcrypto->vdev->config->reset(vdev);
	418	virtcrypto_del_vqs(vcrypto);
	419	free_dev:
	420	virtcrypto_devmgr_rm_dev(vcrypto);
	421	free:
	422	kfree(vcrypto);
	423	return err;
	424	}
	425
	426	static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
	427	{
	428	struct virtio_crypto_request *vc_req;
	429	int i;
	430	struct virtqueue *vq;
	431
	432	for (i = 0; i < vcrypto->max_data_queues; i++) {
	433	vq = vcrypto->data_vq[i].vq;
	434	while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
	435	kfree(vc_req->req_data);
	436	kfree(vc_req->sgs);
	437	}
	438	}
	439	}
	440
	441	static void virtcrypto_remove(struct virtio_device *vdev)
	442	{
	443	struct virtio_crypto *vcrypto = vdev->priv;
	444
	445	dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
	446
	447	if (virtcrypto_dev_started(vcrypto))
	448	virtcrypto_dev_stop(vcrypto);
	449	vdev->config->reset(vdev);
	450	virtcrypto_free_unused_reqs(vcrypto);
d79b5d0b	451	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	452	virtcrypto_del_vqs(vcrypto);
	453	virtcrypto_devmgr_rm_dev(vcrypto);
	454	kfree(vcrypto);
	455	}
	456
	457	static void virtcrypto_config_changed(struct virtio_device *vdev)
	458	{
	459	struct virtio_crypto *vcrypto = vdev->priv;
	460
	461	virtcrypto_update_status(vcrypto);
	462	}
	463
	464	#ifdef CONFIG_PM_SLEEP
	465	static int virtcrypto_freeze(struct virtio_device *vdev)
	466	{
	467	struct virtio_crypto *vcrypto = vdev->priv;
	468
	469	vdev->config->reset(vdev);
	470	virtcrypto_free_unused_reqs(vcrypto);
	471	if (virtcrypto_dev_started(vcrypto))
	472	virtcrypto_dev_stop(vcrypto);
	473
d79b5d0b	474	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	475	virtcrypto_del_vqs(vcrypto);
	476	return 0;
	477	}
	478
	479	static int virtcrypto_restore(struct virtio_device *vdev)
	480	{
	481	struct virtio_crypto *vcrypto = vdev->priv;
	482	int err;
	483
	484	err = virtcrypto_init_vqs(vcrypto);
	485	if (err)
	486	return err;
	487
d79b5d0b GA	488	err = virtcrypto_start_crypto_engines(vcrypto);
	489	if (err)
	490	goto free_vqs;
	491
dbaf0624	492	virtio_device_ready(vdev);
d79b5d0b	493
dbaf0624 G	494	err = virtcrypto_dev_start(vcrypto);
	495	if (err) {
	496	dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
d79b5d0b	497	goto free_engines;
dbaf0624 G	498	}
	499
	500	return 0;
d79b5d0b GA	501
	502	free_engines:
	503	virtcrypto_clear_crypto_engines(vcrypto);
	504	free_vqs:
	505	vcrypto->vdev->config->reset(vdev);
	506	virtcrypto_del_vqs(vcrypto);
	507	return err;
dbaf0624 G	508	}
	509	#endif
	510
	511	static unsigned int features[] = {
	512	/* none */
	513	};
	514
	515	static struct virtio_device_id id_table[] = {
	516	{ VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
	517	{ 0 },
	518	};
	519
	520	static struct virtio_driver virtio_crypto_driver = {
	521	.driver.name = KBUILD_MODNAME,
	522	.driver.owner = THIS_MODULE,
	523	.feature_table = features,
	524	.feature_table_size = ARRAY_SIZE(features),
	525	.id_table = id_table,
	526	.probe = virtcrypto_probe,
	527	.remove = virtcrypto_remove,
	528	.config_changed = virtcrypto_config_changed,
	529	#ifdef CONFIG_PM_SLEEP
	530	.freeze = virtcrypto_freeze,
	531	.restore = virtcrypto_restore,
	532	#endif
	533	};
	534
	535	module_virtio_driver(virtio_crypto_driver);
	536
	537	MODULE_DEVICE_TABLE(virtio, id_table);
	538	MODULE_DESCRIPTION("virtio crypto device driver");
	539	MODULE_LICENSE("GPL");
	540	MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");