[linux-block.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->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>");
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) {
dbaf0624 G	32	kzfree(vc_req->req_data);
	33	kfree(vc_req->sgs);
	34	}
	35	}
	36
	37	static void virtcrypto_dataq_callback(struct virtqueue *vq)
	38	{
	39	struct virtio_crypto *vcrypto = vq->vdev->priv;
	40	struct virtio_crypto_request *vc_req;
	41	unsigned long flags;
	42	unsigned int len;
dbaf0624 G	43	unsigned int qid = vq->index;
	44
	45	spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
	46	do {
	47	virtqueue_disable_cb(vq);
	48	while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
d31e7123 ZX	49	spin_unlock_irqrestore(
	50	&vcrypto->data_vq[qid].lock, flags);
	51	if (vc_req->alg_cb)
	52	vc_req->alg_cb(vc_req, len);
	53	spin_lock_irqsave(
	54	&vcrypto->data_vq[qid].lock, flags);
dbaf0624 G	55	}
	56	} while (!virtqueue_enable_cb(vq));
	57	spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
	58	}
	59
	60	static int virtcrypto_find_vqs(struct virtio_crypto *vi)
	61	{
	62	vq_callback_t **callbacks;
	63	struct virtqueue **vqs;
	64	int ret = -ENOMEM;
	65	int i, total_vqs;
	66	const char **names;
d79b5d0b	67	struct device *dev = &vi->vdev->dev;
dbaf0624 G	68
	69	/*
	70	* We expect 1 data virtqueue, followed by
	71	* possible N-1 data queues used in multiqueue mode,
	72	* followed by control vq.
	73	*/
	74	total_vqs = vi->max_data_queues + 1;
	75
	76	/* Allocate space for find_vqs parameters */
	77	vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
	78	if (!vqs)
	79	goto err_vq;
	80	callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
	81	if (!callbacks)
	82	goto err_callback;
	83	names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
	84	if (!names)
	85	goto err_names;
	86
	87	/* Parameters for control virtqueue */
	88	callbacks[total_vqs - 1] = NULL;
	89	names[total_vqs - 1] = "controlq";
	90
	91	/* Allocate/initialize parameters for data virtqueues */
	92	for (i = 0; i < vi->max_data_queues; i++) {
	93	callbacks[i] = virtcrypto_dataq_callback;
	94	snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
	95	"dataq.%d", i);
	96	names[i] = vi->data_vq[i].name;
	97	}
	98
9b2bbdb2	99	ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
dbaf0624 G	100	if (ret)
	101	goto err_find;
	102
	103	vi->ctrl_vq = vqs[total_vqs - 1];
	104
	105	for (i = 0; i < vi->max_data_queues; i++) {
	106	spin_lock_init(&vi->data_vq[i].lock);
	107	vi->data_vq[i].vq = vqs[i];
d79b5d0b GA	108	/* Initialize crypto engine */
	109	vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
	110	if (!vi->data_vq[i].engine) {
	111	ret = -ENOMEM;
	112	goto err_engine;
	113	}
dbaf0624 G	114	}
	115
	116	kfree(names);
	117	kfree(callbacks);
	118	kfree(vqs);
	119
	120	return 0;
	121
d79b5d0b	122	err_engine:
dbaf0624 G	123	err_find:
	124	kfree(names);
	125	err_names:
	126	kfree(callbacks);
	127	err_callback:
	128	kfree(vqs);
	129	err_vq:
	130	return ret;
	131	}
	132
	133	static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
	134	{
	135	vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
	136	GFP_KERNEL);
	137	if (!vi->data_vq)
	138	return -ENOMEM;
	139
	140	return 0;
	141	}
	142
	143	static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
	144	{
	145	int i;
	146
	147	if (vi->affinity_hint_set) {
	148	for (i = 0; i < vi->max_data_queues; i++)
19e226e8	149	virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
dbaf0624 G	150
	151	vi->affinity_hint_set = false;
	152	}
	153	}
	154
	155	static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
	156	{
	157	int i = 0;
	158	int cpu;
	159
	160	/*
	161	* In single queue mode, we don't set the cpu affinity.
	162	*/
	163	if (vcrypto->curr_queue == 1 \|\| vcrypto->max_data_queues == 1) {
	164	virtcrypto_clean_affinity(vcrypto, -1);
	165	return;
	166	}
	167
	168	/*
	169	* In multiqueue mode, we let the queue to be private to one cpu
	170	* by setting the affinity hint to eliminate the contention.
	171	*
	172	* TODO: adds cpu hotplug support by register cpu notifier.
	173	*
	174	*/
	175	for_each_online_cpu(cpu) {
19e226e8	176	virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
dbaf0624 G	177	if (++i >= vcrypto->max_data_queues)
	178	break;
	179	}
	180
	181	vcrypto->affinity_hint_set = true;
	182	}
	183
	184	static void virtcrypto_free_queues(struct virtio_crypto *vi)
	185	{
	186	kfree(vi->data_vq);
	187	}
	188
	189	static int virtcrypto_init_vqs(struct virtio_crypto *vi)
	190	{
	191	int ret;
	192
	193	/* Allocate send & receive queues */
	194	ret = virtcrypto_alloc_queues(vi);
	195	if (ret)
	196	goto err;
	197
	198	ret = virtcrypto_find_vqs(vi);
	199	if (ret)
	200	goto err_free;
	201
	202	get_online_cpus();
	203	virtcrypto_set_affinity(vi);
	204	put_online_cpus();
	205
	206	return 0;
	207
	208	err_free:
	209	virtcrypto_free_queues(vi);
	210	err:
	211	return ret;
	212	}
	213
	214	static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
	215	{
	216	u32 status;
	217	int err;
	218
	219	virtio_cread(vcrypto->vdev,
	220	struct virtio_crypto_config, status, &status);
	221
	222	/*
	223	* Unknown status bits would be a host error and the driver
	224	* should consider the device to be broken.
	225	*/
	226	if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
	227	dev_warn(&vcrypto->vdev->dev,
	228	"Unknown status bits: 0x%x\n", status);
	229
	230	virtio_break_device(vcrypto->vdev);
	231	return -EPERM;
	232	}
	233
	234	if (vcrypto->status == status)
	235	return 0;
	236
	237	vcrypto->status = status;
	238
	239	if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
	240	err = virtcrypto_dev_start(vcrypto);
241	if (err) {
242	dev_err(&vcrypto->vdev->dev,
243	"Failed to start virtio crypto device.\n");
244
245	return -EPERM;
246	}
d31e7123	247	dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
dbaf0624 G	248	} else {
	249	virtcrypto_dev_stop(vcrypto);
	250	dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
	251	}
	252
	253	return 0;
	254	}
	255
d79b5d0b GA	256	static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
	257	{
	258	int32_t i;
	259	int ret;
	260
	261	for (i = 0; i < vcrypto->max_data_queues; i++) {
	262	if (vcrypto->data_vq[i].engine) {
	263	ret = crypto_engine_start(vcrypto->data_vq[i].engine);
	264	if (ret)
	265	goto err;
	266	}
	267	}
	268
	269	return 0;
	270
	271	err:
	272	while (--i >= 0)
	273	if (vcrypto->data_vq[i].engine)
	274	crypto_engine_exit(vcrypto->data_vq[i].engine);
	275
	276	return ret;
	277	}
	278
	279	static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
	280	{
	281	u32 i;
	282
	283	for (i = 0; i < vcrypto->max_data_queues; i++)
	284	if (vcrypto->data_vq[i].engine)
	285	crypto_engine_exit(vcrypto->data_vq[i].engine);
	286	}
	287
dbaf0624 G	288	static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
	289	{
	290	struct virtio_device *vdev = vcrypto->vdev;
	291
	292	virtcrypto_clean_affinity(vcrypto, -1);
	293
	294	vdev->config->del_vqs(vdev);
	295
	296	virtcrypto_free_queues(vcrypto);
	297	}
	298
	299	static int virtcrypto_probe(struct virtio_device *vdev)
	300	{
	301	int err = -EFAULT;
	302	struct virtio_crypto *vcrypto;
	303	u32 max_data_queues = 0, max_cipher_key_len = 0;
	304	u32 max_auth_key_len = 0;
	305	u64 max_size = 0;
b551bac1 FA	306	u32 cipher_algo_l = 0;
	307	u32 cipher_algo_h = 0;
	308	u32 hash_algo = 0;
	309	u32 mac_algo_l = 0;
	310	u32 mac_algo_h = 0;
	311	u32 aead_algo = 0;
	312	u32 crypto_services = 0;
dbaf0624 G	313
	314	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
	315	return -ENODEV;
	316
	317	if (!vdev->config->get) {
	318	dev_err(&vdev->dev, "%s failure: config access disabled\n",
	319	__func__);
	320	return -EINVAL;
	321	}
	322
	323	if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
	324	/*
	325	* If the accelerator is connected to a node with no memory
	326	* there is no point in using the accelerator since the remote
	327	* memory transaction will be very slow.
	328	*/
	329	dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
	330	return -EINVAL;
	331	}
	332
	333	vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
	334	dev_to_node(&vdev->dev));
	335	if (!vcrypto)
	336	return -ENOMEM;
	337
	338	virtio_cread(vdev, struct virtio_crypto_config,
	339	max_dataqueues, &max_data_queues);
	340	if (max_data_queues < 1)
	341	max_data_queues = 1;
	342
	343	virtio_cread(vdev, struct virtio_crypto_config,
	344	max_cipher_key_len, &max_cipher_key_len);
	345	virtio_cread(vdev, struct virtio_crypto_config,
	346	max_auth_key_len, &max_auth_key_len);
	347	virtio_cread(vdev, struct virtio_crypto_config,
	348	max_size, &max_size);
b551bac1 FA	349	virtio_cread(vdev, struct virtio_crypto_config,
	350	crypto_services, &crypto_services);
	351	virtio_cread(vdev, struct virtio_crypto_config,
	352	cipher_algo_l, &cipher_algo_l);
	353	virtio_cread(vdev, struct virtio_crypto_config,
	354	cipher_algo_h, &cipher_algo_h);
	355	virtio_cread(vdev, struct virtio_crypto_config,
	356	hash_algo, &hash_algo);
	357	virtio_cread(vdev, struct virtio_crypto_config,
	358	mac_algo_l, &mac_algo_l);
	359	virtio_cread(vdev, struct virtio_crypto_config,
	360	mac_algo_h, &mac_algo_h);
	361	virtio_cread(vdev, struct virtio_crypto_config,
	362	aead_algo, &aead_algo);
dbaf0624 G	363
	364	/* Add virtio crypto device to global table */
	365	err = virtcrypto_devmgr_add_dev(vcrypto);
	366	if (err) {
	367	dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
	368	goto free;
	369	}
	370	vcrypto->owner = THIS_MODULE;
	371	vcrypto = vdev->priv = vcrypto;
	372	vcrypto->vdev = vdev;
	373
	374	spin_lock_init(&vcrypto->ctrl_lock);
	375
	376	/* Use single data queue as default */
	377	vcrypto->curr_queue = 1;
	378	vcrypto->max_data_queues = max_data_queues;
	379	vcrypto->max_cipher_key_len = max_cipher_key_len;
	380	vcrypto->max_auth_key_len = max_auth_key_len;
	381	vcrypto->max_size = max_size;
b551bac1 FA	382	vcrypto->crypto_services = crypto_services;
	383	vcrypto->cipher_algo_l = cipher_algo_l;
	384	vcrypto->cipher_algo_h = cipher_algo_h;
	385	vcrypto->mac_algo_l = mac_algo_l;
	386	vcrypto->mac_algo_h = mac_algo_h;
	387	vcrypto->hash_algo = hash_algo;
	388	vcrypto->aead_algo = aead_algo;
	389
dbaf0624 G	390
	391	dev_info(&vdev->dev,
	392	"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
	393	vcrypto->max_data_queues,
	394	vcrypto->max_cipher_key_len,
	395	vcrypto->max_auth_key_len,
	396	vcrypto->max_size);
	397
	398	err = virtcrypto_init_vqs(vcrypto);
	399	if (err) {
	400	dev_err(&vdev->dev, "Failed to initialize vqs.\n");
	401	goto free_dev;
	402	}
d79b5d0b GA	403
	404	err = virtcrypto_start_crypto_engines(vcrypto);
	405	if (err)
	406	goto free_vqs;
	407
dbaf0624 G	408	virtio_device_ready(vdev);
	409
	410	err = virtcrypto_update_status(vcrypto);
	411	if (err)
d79b5d0b	412	goto free_engines;
dbaf0624 G	413
	414	return 0;
	415
d79b5d0b GA	416	free_engines:
d79b5d0b GA	417	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	418	free_vqs:
	419	vcrypto->vdev->config->reset(vdev);
	420	virtcrypto_del_vqs(vcrypto);
	421	free_dev:
	422	virtcrypto_devmgr_rm_dev(vcrypto);
	423	free:
	424	kfree(vcrypto);
	425	return err;
	426	}
	427
	428	static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
	429	{
	430	struct virtio_crypto_request *vc_req;
	431	int i;
	432	struct virtqueue *vq;
	433
	434	for (i = 0; i < vcrypto->max_data_queues; i++) {
	435	vq = vcrypto->data_vq[i].vq;
	436	while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
	437	kfree(vc_req->req_data);
	438	kfree(vc_req->sgs);
	439	}
	440	}
	441	}
	442
	443	static void virtcrypto_remove(struct virtio_device *vdev)
	444	{
	445	struct virtio_crypto *vcrypto = vdev->priv;
	446
	447	dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
	448
	449	if (virtcrypto_dev_started(vcrypto))
	450	virtcrypto_dev_stop(vcrypto);
	451	vdev->config->reset(vdev);
	452	virtcrypto_free_unused_reqs(vcrypto);
d79b5d0b	453	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	454	virtcrypto_del_vqs(vcrypto);
	455	virtcrypto_devmgr_rm_dev(vcrypto);
	456	kfree(vcrypto);
	457	}
	458
	459	static void virtcrypto_config_changed(struct virtio_device *vdev)
	460	{
	461	struct virtio_crypto *vcrypto = vdev->priv;
	462
	463	virtcrypto_update_status(vcrypto);
	464	}
	465
	466	#ifdef CONFIG_PM_SLEEP
	467	static int virtcrypto_freeze(struct virtio_device *vdev)
	468	{
	469	struct virtio_crypto *vcrypto = vdev->priv;
	470
	471	vdev->config->reset(vdev);
	472	virtcrypto_free_unused_reqs(vcrypto);
	473	if (virtcrypto_dev_started(vcrypto))
	474	virtcrypto_dev_stop(vcrypto);
	475
d79b5d0b	476	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	477	virtcrypto_del_vqs(vcrypto);
	478	return 0;
	479	}
	480
	481	static int virtcrypto_restore(struct virtio_device *vdev)
	482	{
	483	struct virtio_crypto *vcrypto = vdev->priv;
	484	int err;
	485
	486	err = virtcrypto_init_vqs(vcrypto);
	487	if (err)
	488	return err;
	489
d79b5d0b GA	490	err = virtcrypto_start_crypto_engines(vcrypto);
	491	if (err)
	492	goto free_vqs;
	493
dbaf0624	494	virtio_device_ready(vdev);
d79b5d0b	495
dbaf0624 G	496	err = virtcrypto_dev_start(vcrypto);
	497	if (err) {
	498	dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
d79b5d0b	499	goto free_engines;
dbaf0624 G	500	}
	501
	502	return 0;
d79b5d0b GA	503
	504	free_engines:
	505	virtcrypto_clear_crypto_engines(vcrypto);
	506	free_vqs:
	507	vcrypto->vdev->config->reset(vdev);
	508	virtcrypto_del_vqs(vcrypto);
	509	return err;
dbaf0624 G	510	}
	511	#endif
	512
	513	static unsigned int features[] = {
	514	/* none */
	515	};
	516
	517	static struct virtio_device_id id_table[] = {
	518	{ VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
	519	{ 0 },
	520	};
	521
	522	static struct virtio_driver virtio_crypto_driver = {
	523	.driver.name = KBUILD_MODNAME,
	524	.driver.owner = THIS_MODULE,
	525	.feature_table = features,
	526	.feature_table_size = ARRAY_SIZE(features),
	527	.id_table = id_table,
	528	.probe = virtcrypto_probe,
	529	.remove = virtcrypto_remove,
	530	.config_changed = virtcrypto_config_changed,
	531	#ifdef CONFIG_PM_SLEEP
	532	.freeze = virtcrypto_freeze,
	533	.restore = virtcrypto_restore,
	534	#endif
	535	};
	536
	537	module_virtio_driver(virtio_crypto_driver);
	538
	539	MODULE_DEVICE_TABLE(virtio, id_table);
	540	MODULE_DESCRIPTION("virtio crypto device driver");
	541	MODULE_LICENSE("GPL");
	542	MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");