linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Adjunct processor matrix VFIO device driver callbacks.

 *

 * Copyright IBM Corp. 2018

 *

 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>

 *        Halil Pasic <pasic@linux.ibm.com>

 *        Pierre Morel <pmorel@linux.ibm.com>

 */

#include <linux/string.h>

#include <linux/vfio.h>

#include <linux/device.h>

#include <linux/list.h>

#include <linux/ctype.h>

#include <linux/bitops.h>

#include <linux/kvm_host.h>

#include <linux/module.h>

#include <asm/kvm.h>

#include <asm/zcrypt.h>

​

#include "vfio_ap_private.h"

​

#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"

#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"

​

static void vfio_ap_matrix_init(struct ap_config_info *info,

                struct ap_matrix *matrix)

{

    matrix->apm_max = info->apxa ? info->Na : 63;

    matrix->aqm_max = info->apxa ? info->Nd : 15;

    matrix->adm_max = info->apxa ? info->Nd : 15;

}

​

static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)

{

    struct ap_matrix_mdev *matrix_mdev;

​

    if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))

        return -EPERM;

​

    matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);

    if (!matrix_mdev) {

        atomic_inc(&matrix_dev->available_instances);

        return -ENOMEM;

    }

​

    vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);

    mdev_set_drvdata(mdev, matrix_mdev);

    mutex_lock(&matrix_dev->lock);

    list_add(&matrix_mdev->node, &matrix_dev->mdev_list);

    mutex_unlock(&matrix_dev->lock);

​

    return 0;

}

​

static int vfio_ap_mdev_remove(struct mdev_device *mdev)

{

    struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

​

    if (matrix_mdev->kvm)

        return -EBUSY;

​

    mutex_lock(&matrix_dev->lock);

    list_del(&matrix_mdev->node);

    mutex_unlock(&matrix_dev->lock);

​

    kfree(matrix_mdev);

    mdev_set_drvdata(mdev, NULL);

    atomic_inc(&matrix_dev->available_instances);

​

    return 0;

}

​

static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)

{

    return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);

}

​

static MDEV_TYPE_ATTR_RO(name);

​

static ssize_t available_instances_show(struct kobject *kobj,

                    struct device *dev, char *buf)

{

    return sprintf(buf, "%d\n",

               atomic_read(&matrix_dev->available_instances));

}

​

static MDEV_TYPE_ATTR_RO(available_instances);

​

static ssize_t device_api_show(struct kobject *kobj, struct device *dev,

                   char *buf)