[linux-block.git] / drivers / crypto / virtio / virtio_crypto_core.c

// SPDX-License-Identifier: GPL-2.0-or-later
 /* Driver for Virtio crypto device.
  *
  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
  */

#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) {
		kfree_sensitive(vc_req->req_data);
		kfree(vc_req->sgs);
	}
}

static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
{
	complete(&vc_ctrl_req->compl);
}

static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
{
	struct virtio_crypto *vcrypto = vq->vdev->priv;
	struct virtio_crypto_ctrl_request *vc_ctrl_req;
	unsigned long flags;
	unsigned int len;

	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
	do {
		virtqueue_disable_cb(vq);
		while ((vc_ctrl_req = virtqueue_get_buf(vq, &len)) != NULL) {
			spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
			virtio_crypto_ctrlq_callback(vc_ctrl_req);
			spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
		}
		if (unlikely(virtqueue_is_broken(vq)))
			break;
	} while (!virtqueue_enable_cb(vq));
	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
}

int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
		unsigned int out_sgs, unsigned int in_sgs,
		struct virtio_crypto_ctrl_request *vc_ctrl_req)
{
	int err;
	unsigned long flags;

	init_completion(&vc_ctrl_req->compl);

	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs, vc_ctrl_req, GFP_ATOMIC);
	if (err < 0) {
		spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
		return err;
	}

	virtqueue_kick(vcrypto->ctrl_vq);
	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);

	wait_for_completion(&vc_ctrl_req->compl);

	return 0;
}

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] = virtcrypto_ctrlq_callback;
	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_and_set(dev, true, NULL, true,
						virtqueue_get_vring_size(vqs[i]));
		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;

	cpus_read_lock();
	virtcrypto_set_affinity(vi);
	cpus_read_unlock();

	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_le(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 void vcrypto_config_changed_work(struct work_struct *work)
{
	struct virtio_crypto *vcrypto =
		container_of(work, struct virtio_crypto, config_work);

	virtcrypto_update_status(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 akcipher_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_le(vdev, struct virtio_crypto_config,
			max_dataqueues, &max_data_queues);
	if (max_data_queues < 1)
		max_data_queues = 1;

	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_cipher_key_len, &max_cipher_key_len);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_auth_key_len, &max_auth_key_len);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_size, &max_size);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			crypto_services, &crypto_services);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			cipher_algo_l, &cipher_algo_l);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			cipher_algo_h, &cipher_algo_h);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			hash_algo, &hash_algo);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			mac_algo_l, &mac_algo_l);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			mac_algo_h, &mac_algo_h);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			aead_algo, &aead_algo);
	if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
		virtio_cread_le(vdev, struct virtio_crypto_config,
				akcipher_algo, &akcipher_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;
	vcrypto->akcipher_algo = akcipher_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;

	INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);

	return 0;

free_engines:
	virtcrypto_clear_crypto_engines(vcrypto);
free_vqs:
	virtio_reset_device(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);
		}
		cond_resched();
	}
}

static void virtcrypto_remove(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;

	dev_info(&vdev->dev, "Start virtcrypto_remove.\n");

	flush_work(&vcrypto->config_work);
	if (virtcrypto_dev_started(vcrypto))
		virtcrypto_dev_stop(vcrypto);
	virtio_reset_device(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;

	schedule_work(&vcrypto->config_work);
}

#ifdef CONFIG_PM_SLEEP
static int virtcrypto_freeze(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;

	flush_work(&vcrypto->config_work);
	virtio_reset_device(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:
	virtio_reset_device(vdev);
	virtcrypto_del_vqs(vcrypto);
	return err;
}
#endif

static const unsigned int features[] = {
	/* none */
};

static const 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
1ccea77e	1	// SPDX-License-Identifier: GPL-2.0-or-later
dbaf0624 G	2	/* Driver for Virtio crypto device.
	3	*
	4	* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
dbaf0624 G	5	*/
	6
	7	#include <linux/err.h>
	8	#include <linux/module.h>
	9	#include <linux/virtio_config.h>
	10	#include <linux/cpu.h>
	11
	12	#include <uapi/linux/virtio_crypto.h>
	13	#include "virtio_crypto_common.h"
	14
	15
d79b5d0b	16	void
dbaf0624 G	17	virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
	18	{
	19	if (vc_req) {
453431a5	20	kfree_sensitive(vc_req->req_data);
dbaf0624 G	21	kfree(vc_req->sgs);
	22	}
	23	}
	24
977231e8	25	static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
	26	{
	27	complete(&vc_ctrl_req->compl);
	28	}
	29
	30	static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
	31	{
	32	struct virtio_crypto *vcrypto = vq->vdev->priv;
	33	struct virtio_crypto_ctrl_request *vc_ctrl_req;
	34	unsigned long flags;
	35	unsigned int len;
	36
	37	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
	38	do {
	39	virtqueue_disable_cb(vq);
	40	while ((vc_ctrl_req = virtqueue_get_buf(vq, &len)) != NULL) {
	41	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
	42	virtio_crypto_ctrlq_callback(vc_ctrl_req);
	43	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
	44	}
	45	if (unlikely(virtqueue_is_broken(vq)))
	46	break;
	47	} while (!virtqueue_enable_cb(vq));
	48	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
	49	}
	50
	51	int virtio_crypto_ctrl_vq_request(struct virtio_crypto vcrypto, struct scatterlist sgs[],
	52	unsigned int out_sgs, unsigned int in_sgs,
	53	struct virtio_crypto_ctrl_request *vc_ctrl_req)
	54	{
	55	int err;
	56	unsigned long flags;
	57
	58	init_completion(&vc_ctrl_req->compl);
	59
	60	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
	61	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs, vc_ctrl_req, GFP_ATOMIC);
	62	if (err < 0) {
	63	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
	64	return err;
	65	}
	66
	67	virtqueue_kick(vcrypto->ctrl_vq);
	68	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
	69
	70	wait_for_completion(&vc_ctrl_req->compl);
	71
	72	return 0;
	73	}
	74
dbaf0624 G	75	static void virtcrypto_dataq_callback(struct virtqueue *vq)
	76	{
	77	struct virtio_crypto *vcrypto = vq->vdev->priv;
	78	struct virtio_crypto_request *vc_req;
	79	unsigned long flags;
	80	unsigned int len;
dbaf0624 G	81	unsigned int qid = vq->index;
	82
	83	spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
	84	do {
	85	virtqueue_disable_cb(vq);
	86	while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
d31e7123 ZX	87	spin_unlock_irqrestore(
	88	&vcrypto->data_vq[qid].lock, flags);
	89	if (vc_req->alg_cb)
	90	vc_req->alg_cb(vc_req, len);
	91	spin_lock_irqsave(
	92	&vcrypto->data_vq[qid].lock, flags);
dbaf0624 G	93	}
	94	} while (!virtqueue_enable_cb(vq));
	95	spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
	96	}
	97
	98	static int virtcrypto_find_vqs(struct virtio_crypto *vi)
	99	{
	100	vq_callback_t **callbacks;
	101	struct virtqueue **vqs;
	102	int ret = -ENOMEM;
	103	int i, total_vqs;
	104	const char **names;
d79b5d0b	105	struct device *dev = &vi->vdev->dev;
dbaf0624 G	106
	107	/*
	108	* We expect 1 data virtqueue, followed by
	109	* possible N-1 data queues used in multiqueue mode,
	110	* followed by control vq.
	111	*/
	112	total_vqs = vi->max_data_queues + 1;
	113
	114	/* Allocate space for find_vqs parameters */
	115	vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
	116	if (!vqs)
	117	goto err_vq;
	118	callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
	119	if (!callbacks)
	120	goto err_callback;
	121	names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
	122	if (!names)
	123	goto err_names;
	124
	125	/* Parameters for control virtqueue */
977231e8	126	callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
dbaf0624 G	127	names[total_vqs - 1] = "controlq";
	128
	129	/* Allocate/initialize parameters for data virtqueues */
	130	for (i = 0; i < vi->max_data_queues; i++) {
	131	callbacks[i] = virtcrypto_dataq_callback;
	132	snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
	133	"dataq.%d", i);
	134	names[i] = vi->data_vq[i].name;
	135	}
	136
9b2bbdb2	137	ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
dbaf0624 G	138	if (ret)
	139	goto err_find;
	140
	141	vi->ctrl_vq = vqs[total_vqs - 1];
	142
	143	for (i = 0; i < vi->max_data_queues; i++) {
	144	spin_lock_init(&vi->data_vq[i].lock);
	145	vi->data_vq[i].vq = vqs[i];
d79b5d0b	146	/* Initialize crypto engine */
4e0d352a	147	vi->data_vq[i].engine = crypto_engine_alloc_init_and_set(dev, true, NULL, true,
4e0d352a	148	virtqueue_get_vring_size(vqs[i]));
d79b5d0b GA	149	if (!vi->data_vq[i].engine) {
	150	ret = -ENOMEM;
	151	goto err_engine;
	152	}
dbaf0624 G	153	}
	154
	155	kfree(names);
	156	kfree(callbacks);
	157	kfree(vqs);
	158
	159	return 0;
	160
d79b5d0b	161	err_engine:
dbaf0624 G	162	err_find:
	163	kfree(names);
	164	err_names:
	165	kfree(callbacks);
	166	err_callback:
	167	kfree(vqs);
	168	err_vq:
	169	return ret;
	170	}
	171
	172	static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
	173	{
	174	vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
	175	GFP_KERNEL);
	176	if (!vi->data_vq)
	177	return -ENOMEM;
	178
	179	return 0;
	180	}
	181
	182	static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
	183	{
	184	int i;
	185
	186	if (vi->affinity_hint_set) {
	187	for (i = 0; i < vi->max_data_queues; i++)
19e226e8	188	virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
dbaf0624 G	189
	190	vi->affinity_hint_set = false;
	191	}
	192	}
	193
	194	static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
	195	{
	196	int i = 0;
	197	int cpu;
	198
	199	/*
	200	* In single queue mode, we don't set the cpu affinity.
	201	*/
	202	if (vcrypto->curr_queue == 1 \|\| vcrypto->max_data_queues == 1) {
	203	virtcrypto_clean_affinity(vcrypto, -1);
	204	return;
	205	}
	206
	207	/*
	208	* In multiqueue mode, we let the queue to be private to one cpu
	209	* by setting the affinity hint to eliminate the contention.
	210	*
	211	* TODO: adds cpu hotplug support by register cpu notifier.
	212	*
	213	*/
	214	for_each_online_cpu(cpu) {
19e226e8	215	virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
dbaf0624 G	216	if (++i >= vcrypto->max_data_queues)
	217	break;
	218	}
	219
	220	vcrypto->affinity_hint_set = true;
	221	}
	222
	223	static void virtcrypto_free_queues(struct virtio_crypto *vi)
	224	{
	225	kfree(vi->data_vq);
	226	}
	227
	228	static int virtcrypto_init_vqs(struct virtio_crypto *vi)
	229	{
	230	int ret;
	231
	232	/* Allocate send & receive queues */
	233	ret = virtcrypto_alloc_queues(vi);
	234	if (ret)
	235	goto err;
	236
	237	ret = virtcrypto_find_vqs(vi);
	238	if (ret)
	239	goto err_free;
	240
d01a9f70	241	cpus_read_lock();
dbaf0624	242	virtcrypto_set_affinity(vi);
d01a9f70	243	cpus_read_unlock();
dbaf0624 G	244
	245	return 0;
	246
	247	err_free:
	248	virtcrypto_free_queues(vi);
	249	err:
	250	return ret;
	251	}
	252
	253	static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
	254	{
	255	u32 status;
	256	int err;
	257
b13a5407 MT	258	virtio_cread_le(vcrypto->vdev,
b13a5407 MT	259	struct virtio_crypto_config, status, &status);
dbaf0624 G	260
	261	/*
	262	* Unknown status bits would be a host error and the driver
	263	* should consider the device to be broken.
	264	*/
	265	if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
	266	dev_warn(&vcrypto->vdev->dev,
	267	"Unknown status bits: 0x%x\n", status);
	268
	269	virtio_break_device(vcrypto->vdev);
	270	return -EPERM;
	271	}
	272
	273	if (vcrypto->status == status)
	274	return 0;
	275
	276	vcrypto->status = status;
	277
	278	if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
	279	err = virtcrypto_dev_start(vcrypto);
	280	if (err) {
	281	dev_err(&vcrypto->vdev->dev,
	282	"Failed to start virtio crypto device.\n");
	283
	284	return -EPERM;
	285	}
d31e7123	286	dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
dbaf0624 G	287	} else {
	288	virtcrypto_dev_stop(vcrypto);
	289	dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
	290	}
	291
	292	return 0;
	293	}
	294
d79b5d0b GA	295	static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
	296	{
	297	int32_t i;
	298	int ret;
	299
	300	for (i = 0; i < vcrypto->max_data_queues; i++) {
	301	if (vcrypto->data_vq[i].engine) {
	302	ret = crypto_engine_start(vcrypto->data_vq[i].engine);
	303	if (ret)
	304	goto err;
	305	}
	306	}
	307
	308	return 0;
	309
	310	err:
	311	while (--i >= 0)
	312	if (vcrypto->data_vq[i].engine)
	313	crypto_engine_exit(vcrypto->data_vq[i].engine);
	314
	315	return ret;
	316	}
	317
	318	static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
	319	{
	320	u32 i;
	321
	322	for (i = 0; i < vcrypto->max_data_queues; i++)
	323	if (vcrypto->data_vq[i].engine)
	324	crypto_engine_exit(vcrypto->data_vq[i].engine);
	325	}
	326
dbaf0624 G	327	static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
	328	{
	329	struct virtio_device *vdev = vcrypto->vdev;
	330
	331	virtcrypto_clean_affinity(vcrypto, -1);
	332
	333	vdev->config->del_vqs(vdev);
	334
	335	virtcrypto_free_queues(vcrypto);
	336	}
	337
fa2e6947	338	static void vcrypto_config_changed_work(struct work_struct *work)
	339	{
	340	struct virtio_crypto *vcrypto =
	341	container_of(work, struct virtio_crypto, config_work);
	342
	343	virtcrypto_update_status(vcrypto);
	344	}
	345
dbaf0624 G	346	static int virtcrypto_probe(struct virtio_device *vdev)
	347	{
	348	int err = -EFAULT;
	349	struct virtio_crypto *vcrypto;
	350	u32 max_data_queues = 0, max_cipher_key_len = 0;
	351	u32 max_auth_key_len = 0;
	352	u64 max_size = 0;
b551bac1 FA	353	u32 cipher_algo_l = 0;
	354	u32 cipher_algo_h = 0;
	355	u32 hash_algo = 0;
	356	u32 mac_algo_l = 0;
	357	u32 mac_algo_h = 0;
	358	u32 aead_algo = 0;
59ca6c93	359	u32 akcipher_algo = 0;
b551bac1	360	u32 crypto_services = 0;
dbaf0624 G	361
	362	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
	363	return -ENODEV;
	364
	365	if (!vdev->config->get) {
	366	dev_err(&vdev->dev, "%s failure: config access disabled\n",
	367	__func__);
	368	return -EINVAL;
	369	}
	370
	371	if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
	372	/*
	373	* If the accelerator is connected to a node with no memory
	374	* there is no point in using the accelerator since the remote
	375	* memory transaction will be very slow.
	376	*/
	377	dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
	378	return -EINVAL;
	379	}
	380
	381	vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
	382	dev_to_node(&vdev->dev));
	383	if (!vcrypto)
	384	return -ENOMEM;
	385
b13a5407	386	virtio_cread_le(vdev, struct virtio_crypto_config,
dbaf0624 G	387	max_dataqueues, &max_data_queues);
	388	if (max_data_queues < 1)
	389	max_data_queues = 1;
	390
b13a5407 MT	391	virtio_cread_le(vdev, struct virtio_crypto_config,
	392	max_cipher_key_len, &max_cipher_key_len);
	393	virtio_cread_le(vdev, struct virtio_crypto_config,
	394	max_auth_key_len, &max_auth_key_len);
	395	virtio_cread_le(vdev, struct virtio_crypto_config,
	396	max_size, &max_size);
	397	virtio_cread_le(vdev, struct virtio_crypto_config,
	398	crypto_services, &crypto_services);
	399	virtio_cread_le(vdev, struct virtio_crypto_config,
	400	cipher_algo_l, &cipher_algo_l);
	401	virtio_cread_le(vdev, struct virtio_crypto_config,
	402	cipher_algo_h, &cipher_algo_h);
	403	virtio_cread_le(vdev, struct virtio_crypto_config,
	404	hash_algo, &hash_algo);
	405	virtio_cread_le(vdev, struct virtio_crypto_config,
	406	mac_algo_l, &mac_algo_l);
	407	virtio_cread_le(vdev, struct virtio_crypto_config,
	408	mac_algo_h, &mac_algo_h);
	409	virtio_cread_le(vdev, struct virtio_crypto_config,
	410	aead_algo, &aead_algo);
59ca6c93	411	if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
	412	virtio_cread_le(vdev, struct virtio_crypto_config,
	413	akcipher_algo, &akcipher_algo);
dbaf0624 G	414
	415	/* Add virtio crypto device to global table */
	416	err = virtcrypto_devmgr_add_dev(vcrypto);
	417	if (err) {
	418	dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
	419	goto free;
	420	}
	421	vcrypto->owner = THIS_MODULE;
	422	vcrypto = vdev->priv = vcrypto;
	423	vcrypto->vdev = vdev;
	424
	425	spin_lock_init(&vcrypto->ctrl_lock);
	426
	427	/* Use single data queue as default */
	428	vcrypto->curr_queue = 1;
	429	vcrypto->max_data_queues = max_data_queues;
	430	vcrypto->max_cipher_key_len = max_cipher_key_len;
	431	vcrypto->max_auth_key_len = max_auth_key_len;
	432	vcrypto->max_size = max_size;
b551bac1 FA	433	vcrypto->crypto_services = crypto_services;
	434	vcrypto->cipher_algo_l = cipher_algo_l;
	435	vcrypto->cipher_algo_h = cipher_algo_h;
	436	vcrypto->mac_algo_l = mac_algo_l;
	437	vcrypto->mac_algo_h = mac_algo_h;
	438	vcrypto->hash_algo = hash_algo;
	439	vcrypto->aead_algo = aead_algo;
59ca6c93	440	vcrypto->akcipher_algo = akcipher_algo;
dbaf0624 G	441
	442	dev_info(&vdev->dev,
	443	"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
	444	vcrypto->max_data_queues,
	445	vcrypto->max_cipher_key_len,
	446	vcrypto->max_auth_key_len,
	447	vcrypto->max_size);
	448
	449	err = virtcrypto_init_vqs(vcrypto);
	450	if (err) {
	451	dev_err(&vdev->dev, "Failed to initialize vqs.\n");
	452	goto free_dev;
	453	}
d79b5d0b GA	454
	455	err = virtcrypto_start_crypto_engines(vcrypto);
	456	if (err)
	457	goto free_vqs;
	458
dbaf0624 G	459	virtio_device_ready(vdev);
	460
	461	err = virtcrypto_update_status(vcrypto);
	462	if (err)
d79b5d0b	463	goto free_engines;
dbaf0624	464
fa2e6947	465	INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);
fa2e6947	466
dbaf0624 G	467	return 0;
dbaf0624 G	468
d79b5d0b GA	469	free_engines:
d79b5d0b GA	470	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624	471	free_vqs:
d9679d00	472	virtio_reset_device(vdev);
dbaf0624 G	473	virtcrypto_del_vqs(vcrypto);
	474	free_dev:
	475	virtcrypto_devmgr_rm_dev(vcrypto);
	476	free:
	477	kfree(vcrypto);
	478	return err;
	479	}
	480
	481	static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
	482	{
	483	struct virtio_crypto_request *vc_req;
	484	int i;
	485	struct virtqueue *vq;
	486
	487	for (i = 0; i < vcrypto->max_data_queues; i++) {
	488	vq = vcrypto->data_vq[i].vq;
	489	while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
	490	kfree(vc_req->req_data);
	491	kfree(vc_req->sgs);
	492	}
7a5103b8	493	cond_resched();
dbaf0624 G	494	}
	495	}
	496
	497	static void virtcrypto_remove(struct virtio_device *vdev)
	498	{
	499	struct virtio_crypto *vcrypto = vdev->priv;
	500
	501	dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
	502
fa2e6947	503	flush_work(&vcrypto->config_work);
dbaf0624 G	504	if (virtcrypto_dev_started(vcrypto))
dbaf0624 G	505	virtcrypto_dev_stop(vcrypto);
d9679d00	506	virtio_reset_device(vdev);
dbaf0624	507	virtcrypto_free_unused_reqs(vcrypto);
d79b5d0b	508	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	509	virtcrypto_del_vqs(vcrypto);
	510	virtcrypto_devmgr_rm_dev(vcrypto);
	511	kfree(vcrypto);
	512	}
	513
	514	static void virtcrypto_config_changed(struct virtio_device *vdev)
	515	{
	516	struct virtio_crypto *vcrypto = vdev->priv;
	517
fa2e6947	518	schedule_work(&vcrypto->config_work);
dbaf0624 G	519	}
	520
	521	#ifdef CONFIG_PM_SLEEP
	522	static int virtcrypto_freeze(struct virtio_device *vdev)
	523	{
	524	struct virtio_crypto *vcrypto = vdev->priv;
	525
fa2e6947	526	flush_work(&vcrypto->config_work);
d9679d00	527	virtio_reset_device(vdev);
dbaf0624 G	528	virtcrypto_free_unused_reqs(vcrypto);
	529	if (virtcrypto_dev_started(vcrypto))
	530	virtcrypto_dev_stop(vcrypto);
	531
d79b5d0b	532	virtcrypto_clear_crypto_engines(vcrypto);
dbaf0624 G	533	virtcrypto_del_vqs(vcrypto);
	534	return 0;
	535	}
	536
	537	static int virtcrypto_restore(struct virtio_device *vdev)
	538	{
	539	struct virtio_crypto *vcrypto = vdev->priv;
	540	int err;
	541
	542	err = virtcrypto_init_vqs(vcrypto);
	543	if (err)
	544	return err;
	545
d79b5d0b GA	546	err = virtcrypto_start_crypto_engines(vcrypto);
	547	if (err)
	548	goto free_vqs;
	549
dbaf0624	550	virtio_device_ready(vdev);
d79b5d0b	551
dbaf0624 G	552	err = virtcrypto_dev_start(vcrypto);
	553	if (err) {
	554	dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
d79b5d0b	555	goto free_engines;
dbaf0624 G	556	}
	557
	558	return 0;
d79b5d0b GA	559
	560	free_engines:
	561	virtcrypto_clear_crypto_engines(vcrypto);
	562	free_vqs:
d9679d00	563	virtio_reset_device(vdev);
d79b5d0b GA	564	virtcrypto_del_vqs(vcrypto);
d79b5d0b GA	565	return err;
dbaf0624 G	566	}
	567	#endif
	568
ad6a0664	569	static const unsigned int features[] = {
dbaf0624 G	570	/* none */
	571	};
	572
ad6a0664	573	static const struct virtio_device_id id_table[] = {
dbaf0624 G	574	{ VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
	575	{ 0 },
	576	};
	577
	578	static struct virtio_driver virtio_crypto_driver = {
	579	.driver.name = KBUILD_MODNAME,
	580	.driver.owner = THIS_MODULE,
	581	.feature_table = features,
	582	.feature_table_size = ARRAY_SIZE(features),
	583	.id_table = id_table,
	584	.probe = virtcrypto_probe,
	585	.remove = virtcrypto_remove,
	586	.config_changed = virtcrypto_config_changed,
	587	#ifdef CONFIG_PM_SLEEP
	588	.freeze = virtcrypto_freeze,
	589	.restore = virtcrypto_restore,
	590	#endif
	591	};
	592
	593	module_virtio_driver(virtio_crypto_driver);
	594
	595	MODULE_DEVICE_TABLE(virtio, id_table);
	596	MODULE_DESCRIPTION("virtio crypto device driver");
	597	MODULE_LICENSE("GPL");
	598	MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");