Orange Pi5 kernel

// 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 int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
 
static int match_apqn(struct device *dev, const void *data)
{
<------>struct vfio_ap_queue *q = dev_get_drvdata(dev);
 
<------>return (q->apqn == *(int *)(data)) ? 1 : 0;
}
 
/**
 * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
 * @matrix_mdev: the associated mediated matrix
 * @apqn: The queue APQN
 *
 * Retrieve a queue with a specific APQN from the list of the
 * devices of the vfio_ap_drv.
 * Verify that the APID and the APQI are set in the matrix.
 *
 * Returns the pointer to the associated vfio_ap_queue
 */
static struct vfio_ap_queue *vfio_ap_get_queue(
<------><------><------><------><------>struct ap_matrix_mdev *matrix_mdev,
<------><------><------><------><------>int apqn)
{
<------>struct vfio_ap_queue *q;
 
<------>if (!test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm))
<------><------>return NULL;
<------>if (!test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm))
<------><------>return NULL;
 
<------>q = vfio_ap_find_queue(apqn);
<------>if (q)
<------><------>q->matrix_mdev = matrix_mdev;
 
<------>return q;
}
 
/**
 * vfio_ap_wait_for_irqclear
 * @apqn: The AP Queue number
 *
 * Checks the IRQ bit for the status of this APQN using ap_tapq.
 * Returns if the ap_tapq function succeeded and the bit is clear.
 * Returns if ap_tapq function failed with invalid, deconfigured or
 * checkstopped AP.
 * Otherwise retries up to 5 times after waiting 20ms.
 *
 */
static void vfio_ap_wait_for_irqclear(int apqn)
{
<------>struct ap_queue_status status;
<------>int retry = 5;
 
<------>do {
<------><------>status = ap_tapq(apqn, NULL);
<------><------>switch (status.response_code) {
<------><------>case AP_RESPONSE_NORMAL:
<------><------>case AP_RESPONSE_RESET_IN_PROGRESS:
<------><------><------>if (!status.irq_enabled)
<------><------><------><------>return;
<------><------><------>fallthrough;
<------><------>case AP_RESPONSE_BUSY:
<------><------><------>msleep(20);
<------><------><------>break;
<------><------>case AP_RESPONSE_Q_NOT_AVAIL:
<------><------>case AP_RESPONSE_DECONFIGURED:
<------><------>case AP_RESPONSE_CHECKSTOPPED:
<------><------>default:
<------><------><------>WARN_ONCE(1, "%s: tapq rc %02x: %04x\n", __func__,
<------><------><------><------>  status.response_code, apqn);
<------><------><------>return;
<------><------>}
<------>} while (--retry);
 
<------>WARN_ONCE(1, "%s: tapq rc %02x: %04x could not clear IR bit\n",
<------><------>  __func__, status.response_code, apqn);
}
 
/**
 * vfio_ap_free_aqic_resources
 * @q: The vfio_ap_queue
 *
 * Unregisters the ISC in the GIB when the saved ISC not invalid.
 * Unpin the guest's page holding the NIB when it exist.
 * Reset the saved_pfn and saved_isc to invalid values.
 *
 */
static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
{
<------>if (!q)
<------><------>return;
<------>if (q->saved_isc != VFIO_AP_ISC_INVALID &&
<------>    !WARN_ON(!(q->matrix_mdev && q->matrix_mdev->kvm))) {
<------><------>kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
<------><------>q->saved_isc = VFIO_AP_ISC_INVALID;
<------>}
<------>if (q->saved_pfn && !WARN_ON(!q->matrix_mdev)) {
<------><------>vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev),
<------><------><------><------> &q->saved_pfn, 1);
<------><------>q->saved_pfn = 0;
<------>}
}
 
/**
 * vfio_ap_irq_disable
 * @q: The vfio_ap_queue
 *
 * Uses ap_aqic to disable the interruption and in case of success, reset
 * in progress or IRQ disable command already proceeded: calls
 * vfio_ap_wait_for_irqclear() to check for the IRQ bit to be clear
 * and calls vfio_ap_free_aqic_resources() to free the resources associated
 * with the AP interrupt handling.
 *
 * In the case the AP is busy, or a reset is in progress,
 * retries after 20ms, up to 5 times.
 *
 * Returns if ap_aqic function failed with invalid, deconfigured or
 * checkstopped AP.
 */
static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
{
<------>struct ap_qirq_ctrl aqic_gisa = {};
<------>struct ap_queue_status status;
<------>int retries = 5;
 
<------>do {
<------><------>status = ap_aqic(q->apqn, aqic_gisa, NULL);
<------><------>switch (status.response_code) {
<------><------>case AP_RESPONSE_OTHERWISE_CHANGED:
<------><------>case AP_RESPONSE_NORMAL:
<------><------><------>vfio_ap_wait_for_irqclear(q->apqn);
<------><------><------>goto end_free;
<------><------>case AP_RESPONSE_RESET_IN_PROGRESS:
<------><------>case AP_RESPONSE_BUSY:
<------><------><------>msleep(20);
<------><------><------>break;
<------><------>case AP_RESPONSE_Q_NOT_AVAIL:
<------><------>case AP_RESPONSE_DECONFIGURED:
<------><------>case AP_RESPONSE_CHECKSTOPPED:
<------><------>case AP_RESPONSE_INVALID_ADDRESS:
<------><------>default:
<------><------><------>/* All cases in default means AP not operational */
<------><------><------>WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
<------><------><------><------>  status.response_code);
<------><------><------>goto end_free;
<------><------>}
<------>} while (retries--);
 
<------>WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
<------><------>  status.response_code);
end_free:
<------>vfio_ap_free_aqic_resources(q);
<------>q->matrix_mdev = NULL;
<------>return status;
}
 
/**
 * vfio_ap_setirq: Enable Interruption for a APQN
 *
 * @dev: the device associated with the ap_queue
 * @q:	 the vfio_ap_queue holding AQIC parameters
 *
 * Pin the NIB saved in *q
 * Register the guest ISC to GIB interface and retrieve the
 * host ISC to issue the host side PQAP/AQIC
 *
 * Response.status may be set to AP_RESPONSE_INVALID_ADDRESS in case the
 * vfio_pin_pages failed.
 *
 * Otherwise return the ap_queue_status returned by the ap_aqic(),
 * all retry handling will be done by the guest.
 */
static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
<------><------><------><------><------><------> int isc,
<------><------><------><------><------><------> unsigned long nib)
{
<------>struct ap_qirq_ctrl aqic_gisa = {};
<------>struct ap_queue_status status = {};
<------>struct kvm_s390_gisa *gisa;
<------>struct kvm *kvm;
<------>unsigned long h_nib, g_pfn, h_pfn;
<------>int ret;
 
<------>g_pfn = nib >> PAGE_SHIFT;
<------>ret = vfio_pin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1,
<------><------><------>     IOMMU_READ | IOMMU_WRITE, &h_pfn);
<------>switch (ret) {
<------>case 1:
<------><------>break;
<------>default:
<------><------>status.response_code = AP_RESPONSE_INVALID_ADDRESS;
<------><------>return status;
<------>}
 
<------>kvm = q->matrix_mdev->kvm;
<------>gisa = kvm->arch.gisa_int.origin;
 
<------>h_nib = (h_pfn << PAGE_SHIFT) | (nib & ~PAGE_MASK);
<------>aqic_gisa.gisc = isc;
<------>aqic_gisa.isc = kvm_s390_gisc_register(kvm, isc);
<------>aqic_gisa.ir = 1;
<------>aqic_gisa.gisa = (uint64_t)gisa >> 4;
 
<------>status = ap_aqic(q->apqn, aqic_gisa, (void *)h_nib);
<------>switch (status.response_code) {
<------>case AP_RESPONSE_NORMAL:
<------><------>/* See if we did clear older IRQ configuration */
<------><------>vfio_ap_free_aqic_resources(q);
<------><------>q->saved_pfn = g_pfn;
<------><------>q->saved_isc = isc;
<------><------>break;
<------>case AP_RESPONSE_OTHERWISE_CHANGED:
<------><------>/* We could not modify IRQ setings: clear new configuration */
<------><------>vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1);
<------><------>kvm_s390_gisc_unregister(kvm, isc);
<------><------>break;
<------>default:
<------><------>pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn,
<------><------><------>status.response_code);
<------><------>vfio_ap_irq_disable(q);
<------><------>break;
<------>}
 
<------>return status;
}
 
/**
 * handle_pqap: PQAP instruction callback
 *
 * @vcpu: The vcpu on which we received the PQAP instruction
 *
 * Get the general register contents to initialize internal variables.
 * REG[0]: APQN
 * REG[1]: IR and ISC
 * REG[2]: NIB
 *
 * Response.status may be set to following Response Code:
 * - AP_RESPONSE_Q_NOT_AVAIL: if the queue is not available
 * - AP_RESPONSE_DECONFIGURED: if the queue is not configured
 * - AP_RESPONSE_NORMAL (0) : in case of successs
 *   Check vfio_ap_setirq() and vfio_ap_clrirq() for other possible RC.
 * We take the matrix_dev lock to ensure serialization on queues and
 * mediated device access.
 *
 * Return 0 if we could handle the request inside KVM.
 * otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
 */
static int handle_pqap(struct kvm_vcpu *vcpu)
{
<------>uint64_t status;
<------>uint16_t apqn;
<------>struct vfio_ap_queue *q;
<------>struct ap_queue_status qstatus = {
<------><------><------>       .response_code = AP_RESPONSE_Q_NOT_AVAIL, };
<------>struct ap_matrix_mdev *matrix_mdev;
 
<------>/* If we do not use the AIV facility just go to userland */
<------>if (!(vcpu->arch.sie_block->eca & ECA_AIV))
<------><------>return -EOPNOTSUPP;
 
<------>apqn = vcpu->run->s.regs.gprs[0] & 0xffff;
<------>mutex_lock(&matrix_dev->lock);
 
<------>if (!vcpu->kvm->arch.crypto.pqap_hook)
<------><------>goto out_unlock;
<------>matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
<------><------><------><------>   struct ap_matrix_mdev, pqap_hook);
 
<------>q = vfio_ap_get_queue(matrix_mdev, apqn);
<------>if (!q)
<------><------>goto out_unlock;
 
<------>status = vcpu->run->s.regs.gprs[1];
 
<------>/* If IR bit(16) is set we enable the interrupt */
<------>if ((status >> (63 - 16)) & 0x01)
<------><------>qstatus = vfio_ap_irq_enable(q, status & 0x07,
<------><------><------><------><------>     vcpu->run->s.regs.gprs[2]);
<------>else
<------><------>qstatus = vfio_ap_irq_disable(q);
 
out_unlock:
<------>memcpy(&vcpu->run->s.regs.gprs[1], &qstatus, sizeof(qstatus));
<------>vcpu->run->s.regs.gprs[1] >>= 32;
<------>mutex_unlock(&matrix_dev->lock);
<------>return 0;
}
 
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;
<------>}
 
<------>matrix_mdev->mdev = mdev;
<------>vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
<------>mdev_set_drvdata(mdev, matrix_mdev);
<------>matrix_mdev->pqap_hook.hook = handle_pqap;
<------>matrix_mdev->pqap_hook.owner = THIS_MODULE;
<------>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);
<------>vfio_ap_mdev_reset_queues(mdev);
<------>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)
{
<------>return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
}
 
static MDEV_TYPE_ATTR_RO(device_api);
 
static struct attribute *vfio_ap_mdev_type_attrs[] = {
<------>&mdev_type_attr_name.attr,
<------>&mdev_type_attr_device_api.attr,
<------>&mdev_type_attr_available_instances.attr,
<------>NULL,
};
 
static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
<------>.name = VFIO_AP_MDEV_TYPE_HWVIRT,
<------>.attrs = vfio_ap_mdev_type_attrs,
};
 
static struct attribute_group *vfio_ap_mdev_type_groups[] = {
<------>&vfio_ap_mdev_hwvirt_type_group,
<------>NULL,
};
 
struct vfio_ap_queue_reserved {
<------>unsigned long *apid;
<------>unsigned long *apqi;
<------>bool reserved;
};
 
/**
 * vfio_ap_has_queue
 *
 * @dev: an AP queue device
 * @data: a struct vfio_ap_queue_reserved reference
 *
 * Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
 * apid or apqi specified in @data:
 *
 * - If @data contains both an apid and apqi value, then @data will be flagged
 *   as reserved if the APID and APQI fields for the AP queue device matches
 *
 * - If @data contains only an apid value, @data will be flagged as
 *   reserved if the APID field in the AP queue device matches
 *
 * - If @data contains only an apqi value, @data will be flagged as
 *   reserved if the APQI field in the AP queue device matches
 *
 * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
 * @data does not contain either an apid or apqi.
 */
static int vfio_ap_has_queue(struct device *dev, void *data)
{
<------>struct vfio_ap_queue_reserved *qres = data;
<------>struct ap_queue *ap_queue = to_ap_queue(dev);
<------>ap_qid_t qid;
<------>unsigned long id;
 
<------>if (qres->apid && qres->apqi) {
<------><------>qid = AP_MKQID(*qres->apid, *qres->apqi);
<------><------>if (qid == ap_queue->qid)
<------><------><------>qres->reserved = true;
<------>} else if (qres->apid && !qres->apqi) {
<------><------>id = AP_QID_CARD(ap_queue->qid);
<------><------>if (id == *qres->apid)
<------><------><------>qres->reserved = true;
<------>} else if (!qres->apid && qres->apqi) {
<------><------>id = AP_QID_QUEUE(ap_queue->qid);
<------><------>if (id == *qres->apqi)
<------><------><------>qres->reserved = true;
<------>} else {
<------><------>return -EINVAL;
<------>}
 
<------>return 0;
}
 
/**
 * vfio_ap_verify_queue_reserved
 *
 * @matrix_dev: a mediated matrix device
 * @apid: an AP adapter ID
 * @apqi: an AP queue index
 *
 * Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
 * driver according to the following rules:
 *
 * - If both @apid and @apqi are not NULL, then there must be an AP queue
 *   device bound to the vfio_ap driver with the APQN identified by @apid and
 *   @apqi
 *
 * - If only @apid is not NULL, then there must be an AP queue device bound
 *   to the vfio_ap driver with an APQN containing @apid
 *
 * - If only @apqi is not NULL, then there must be an AP queue device bound
 *   to the vfio_ap driver with an APQN containing @apqi
 *
 * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
 */
static int vfio_ap_verify_queue_reserved(unsigned long *apid,
<------><------><------><------><------> unsigned long *apqi)
{
<------>int ret;
<------>struct vfio_ap_queue_reserved qres;
 
<------>qres.apid = apid;
<------>qres.apqi = apqi;
<------>qres.reserved = false;
 
<------>ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
<------><------><------><------>     &qres, vfio_ap_has_queue);
<------>if (ret)
<------><------>return ret;
 
<------>if (qres.reserved)
<------><------>return 0;
 
<------>return -EADDRNOTAVAIL;
}
 
static int
vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
<------><------><------><------><------>     unsigned long apid)
{
<------>int ret;
<------>unsigned long apqi;
<------>unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;
 
<------>if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
<------><------>return vfio_ap_verify_queue_reserved(&apid, NULL);
 
<------>for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
<------><------>ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}
 
/**
 * vfio_ap_mdev_verify_no_sharing
 *
 * Verifies that the APQNs derived from the cross product of the AP adapter IDs
 * and AP queue indexes comprising the AP matrix are not configured for another
 * mediated device. AP queue sharing is not allowed.
 *
 * @matrix_mdev: the mediated matrix device
 *
 * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
 */
static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
{
<------>struct ap_matrix_mdev *lstdev;
<------>DECLARE_BITMAP(apm, AP_DEVICES);
<------>DECLARE_BITMAP(aqm, AP_DOMAINS);
 
<------>list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
<------><------>if (matrix_mdev == lstdev)
<------><------><------>continue;
 
<------><------>memset(apm, 0, sizeof(apm));
<------><------>memset(aqm, 0, sizeof(aqm));
 
<------><------>/*
<------><------> * We work on full longs, as we can only exclude the leftover
<------><------> * bits in non-inverse order. The leftover is all zeros.
<------><------> */
<------><------>if (!bitmap_and(apm, matrix_mdev->matrix.apm,
<------><------><------><------>lstdev->matrix.apm, AP_DEVICES))
<------><------><------>continue;
 
<------><------>if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
<------><------><------><------>lstdev->matrix.aqm, AP_DOMAINS))
<------><------><------>continue;
 
<------><------>return -EADDRINUSE;
<------>}
 
<------>return 0;
}
 
/**
 * assign_adapter_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_adapter attribute
 * @buf:	a buffer containing the AP adapter number (APID) to
 *		be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APID from @buf and sets the corresponding bit in the mediated
 * matrix device's APM.
 *
 * Returns the number of bytes processed if the APID is valid; otherwise,
 * returns one of the following errors:
 *
 *	1. -EINVAL
 *	   The APID is not a valid number
 *
 *	2. -ENODEV
 *	   The APID exceeds the maximum value configured for the system
 *
 *	3. -EADDRNOTAVAIL
 *	   An APQN derived from the cross product of the APID being assigned
 *	   and the APQIs previously assigned is not bound to the vfio_ap device
 *	   driver; or, if no APQIs have yet been assigned, the APID is not
 *	   contained in an APQN bound to the vfio_ap device driver.
 *
 *	4. -EADDRINUSE
 *	   An APQN derived from the cross product of the APID being assigned
 *	   and the APQIs previously assigned is being used by another mediated
 *	   matrix device
 */
static ssize_t assign_adapter_store(struct device *dev,
<------><------><------><------>    struct device_attribute *attr,
<------><------><------><------>    const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long apid;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>/* If the guest is running, disallow assignment of adapter */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &apid);
<------>if (ret)
<------><------>return ret;
 
<------>if (apid > matrix_mdev->matrix.apm_max)
<------><------>return -ENODEV;
 
<------>/*
<------> * Set the bit in the AP mask (APM) corresponding to the AP adapter
<------> * number (APID). The bits in the mask, from most significant to least
<------> * significant bit, correspond to APIDs 0-255.
<------> */
<------>mutex_lock(&matrix_dev->lock);
 
<------>ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
<------>if (ret)
<------><------>goto done;
 
<------>set_bit_inv(apid, matrix_mdev->matrix.apm);
 
<------>ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
<------>if (ret)
<------><------>goto share_err;
 
<------>ret = count;
<------>goto done;
 
share_err:
<------>clear_bit_inv(apid, matrix_mdev->matrix.apm);
done:
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return ret;
}
static DEVICE_ATTR_WO(assign_adapter);
 
/**
 * unassign_adapter_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_adapter attribute
 * @buf:	a buffer containing the adapter number (APID) to be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APID from @buf and clears the corresponding bit in the mediated
 * matrix device's APM.
 *
 * Returns the number of bytes processed if the APID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the APID is not a number
 *	-ENODEV if the APID it exceeds the maximum value configured for the
 *		system
 */
static ssize_t unassign_adapter_store(struct device *dev,
<------><------><------><------>      struct device_attribute *attr,
<------><------><------><------>      const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long apid;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>/* If the guest is running, disallow un-assignment of adapter */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &apid);
<------>if (ret)
<------><------>return ret;
 
<------>if (apid > matrix_mdev->matrix.apm_max)
<------><------>return -ENODEV;
 
<------>mutex_lock(&matrix_dev->lock);
<------>clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return count;
}
static DEVICE_ATTR_WO(unassign_adapter);
 
static int
vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
<------><------><------><------><------>     unsigned long apqi)
{
<------>int ret;
<------>unsigned long apid;
<------>unsigned long nbits = matrix_mdev->matrix.apm_max + 1;
 
<------>if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits)
<------><------>return vfio_ap_verify_queue_reserved(NULL, &apqi);
 
<------>for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) {
<------><------>ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}
 
/**
 * assign_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_domain attribute
 * @buf:	a buffer containing the AP queue index (APQI) of the domain to
 *		be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APQI from @buf and sets the corresponding bit in the mediated
 * matrix device's AQM.
 *
 * Returns the number of bytes processed if the APQI is valid; otherwise returns
 * one of the following errors:
 *
 *	1. -EINVAL
 *	   The APQI is not a valid number
 *
 *	2. -ENODEV
 *	   The APQI exceeds the maximum value configured for the system
 *
 *	3. -EADDRNOTAVAIL
 *	   An APQN derived from the cross product of the APQI being assigned
 *	   and the APIDs previously assigned is not bound to the vfio_ap device
 *	   driver; or, if no APIDs have yet been assigned, the APQI is not
 *	   contained in an APQN bound to the vfio_ap device driver.
 *
 *	4. -EADDRINUSE
 *	   An APQN derived from the cross product of the APQI being assigned
 *	   and the APIDs previously assigned is being used by another mediated
 *	   matrix device
 */
static ssize_t assign_domain_store(struct device *dev,
<------><------><------><------>   struct device_attribute *attr,
<------><------><------><------>   const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long apqi;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
<------>unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
 
<------>/* If the guest is running, disallow assignment of domain */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &apqi);
<------>if (ret)
<------><------>return ret;
<------>if (apqi > max_apqi)
<------><------>return -ENODEV;
 
<------>mutex_lock(&matrix_dev->lock);
 
<------>ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
<------>if (ret)
<------><------>goto done;
 
<------>set_bit_inv(apqi, matrix_mdev->matrix.aqm);
 
<------>ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
<------>if (ret)
<------><------>goto share_err;
 
<------>ret = count;
<------>goto done;
 
share_err:
<------>clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
done:
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return ret;
}
static DEVICE_ATTR_WO(assign_domain);
 
 
/**
 * unassign_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_domain attribute
 * @buf:	a buffer containing the AP queue index (APQI) of the domain to
 *		be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APQI from @buf and clears the corresponding bit in the
 * mediated matrix device's AQM.
 *
 * Returns the number of bytes processed if the APQI is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the APQI is not a number
 *	-ENODEV if the APQI exceeds the maximum value configured for the system
 */
static ssize_t unassign_domain_store(struct device *dev,
<------><------><------><------>     struct device_attribute *attr,
<------><------><------><------>     const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long apqi;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>/* If the guest is running, disallow un-assignment of domain */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &apqi);
<------>if (ret)
<------><------>return ret;
 
<------>if (apqi > matrix_mdev->matrix.aqm_max)
<------><------>return -ENODEV;
 
<------>mutex_lock(&matrix_dev->lock);
<------>clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return count;
}
static DEVICE_ATTR_WO(unassign_domain);
 
/**
 * assign_control_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_control_domain attribute
 * @buf:	a buffer containing the domain ID to be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the domain ID from @buf and sets the corresponding bit in the mediated
 * matrix device's ADM.
 *
 * Returns the number of bytes processed if the domain ID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the ID is not a number
 *	-ENODEV if the ID exceeds the maximum value configured for the system
 */
static ssize_t assign_control_domain_store(struct device *dev,
<------><------><------><------><------>   struct device_attribute *attr,
<------><------><------><------><------>   const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long id;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>/* If the guest is running, disallow assignment of control domain */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &id);
<------>if (ret)
<------><------>return ret;
 
<------>if (id > matrix_mdev->matrix.adm_max)
<------><------>return -ENODEV;
 
<------>/* Set the bit in the ADM (bitmask) corresponding to the AP control
<------> * domain number (id). The bits in the mask, from most significant to
<------> * least significant, correspond to IDs 0 up to the one less than the
<------> * number of control domains that can be assigned.
<------> */
<------>mutex_lock(&matrix_dev->lock);
<------>set_bit_inv(id, matrix_mdev->matrix.adm);
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return count;
}
static DEVICE_ATTR_WO(assign_control_domain);
 
/**
 * unassign_control_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_control_domain attribute
 * @buf:	a buffer containing the domain ID to be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the domain ID from @buf and clears the corresponding bit in the
 * mediated matrix device's ADM.
 *
 * Returns the number of bytes processed if the domain ID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the ID is not a number
 *	-ENODEV if the ID exceeds the maximum value configured for the system
 */
static ssize_t unassign_control_domain_store(struct device *dev,
<------><------><------><------><------>     struct device_attribute *attr,
<------><------><------><------><------>     const char *buf, size_t count)
{
<------>int ret;
<------>unsigned long domid;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
<------>unsigned long max_domid =  matrix_mdev->matrix.adm_max;
 
<------>/* If the guest is running, disallow un-assignment of control domain */
<------>if (matrix_mdev->kvm)
<------><------>return -EBUSY;
 
<------>ret = kstrtoul(buf, 0, &domid);
<------>if (ret)
<------><------>return ret;
<------>if (domid > max_domid)
<------><------>return -ENODEV;
 
<------>mutex_lock(&matrix_dev->lock);
<------>clear_bit_inv(domid, matrix_mdev->matrix.adm);
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return count;
}
static DEVICE_ATTR_WO(unassign_control_domain);
 
static ssize_t control_domains_show(struct device *dev,
<------><------><------><------>    struct device_attribute *dev_attr,
<------><------><------><------>    char *buf)
{
<------>unsigned long id;
<------>int nchars = 0;
<------>int n;
<------>char *bufpos = buf;
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
<------>unsigned long max_domid = matrix_mdev->matrix.adm_max;
 
<------>mutex_lock(&matrix_dev->lock);
<------>for_each_set_bit_inv(id, matrix_mdev->matrix.adm, max_domid + 1) {
<------><------>n = sprintf(bufpos, "%04lx\n", id);
<------><------>bufpos += n;
<------><------>nchars += n;
<------>}
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return nchars;
}
static DEVICE_ATTR_RO(control_domains);
 
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
<------><------><------>   char *buf)
{
<------>struct mdev_device *mdev = mdev_from_dev(dev);
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
<------>char *bufpos = buf;
<------>unsigned long apid;
<------>unsigned long apqi;
<------>unsigned long apid1;
<------>unsigned long apqi1;
<------>unsigned long napm_bits = matrix_mdev->matrix.apm_max + 1;
<------>unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;
<------>int nchars = 0;
<------>int n;
 
<------>apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);
<------>apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);
 
<------>mutex_lock(&matrix_dev->lock);
 
<------>if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
<------><------>for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
<------><------><------>for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
<------><------><------><------><------>     naqm_bits) {
<------><------><------><------>n = sprintf(bufpos, "%02lx.%04lx\n", apid,
<------><------><------><------><------>    apqi);
<------><------><------><------>bufpos += n;
<------><------><------><------>nchars += n;
<------><------><------>}
<------><------>}
<------>} else if (apid1 < napm_bits) {
<------><------>for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
<------><------><------>n = sprintf(bufpos, "%02lx.\n", apid);
<------><------><------>bufpos += n;
<------><------><------>nchars += n;
<------><------>}
<------>} else if (apqi1 < naqm_bits) {
<------><------>for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm_bits) {
<------><------><------>n = sprintf(bufpos, ".%04lx\n", apqi);
<------><------><------>bufpos += n;
<------><------><------>nchars += n;
<------><------>}
<------>}
 
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return nchars;
}
static DEVICE_ATTR_RO(matrix);
 
static struct attribute *vfio_ap_mdev_attrs[] = {
<------>&dev_attr_assign_adapter.attr,
<------>&dev_attr_unassign_adapter.attr,
<------>&dev_attr_assign_domain.attr,
<------>&dev_attr_unassign_domain.attr,
<------>&dev_attr_assign_control_domain.attr,
<------>&dev_attr_unassign_control_domain.attr,
<------>&dev_attr_control_domains.attr,
<------>&dev_attr_matrix.attr,
<------>NULL,
};
 
static struct attribute_group vfio_ap_mdev_attr_group = {
<------>.attrs = vfio_ap_mdev_attrs
};
 
static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
<------>&vfio_ap_mdev_attr_group,
<------>NULL
};
 
/**
 * vfio_ap_mdev_set_kvm
 *
 * @matrix_mdev: a mediated matrix device
 * @kvm: reference to KVM instance
 *
 * Verifies no other mediated matrix device has @kvm and sets a reference to
 * it in @matrix_mdev->kvm.
 *
 * Return 0 if no other mediated matrix device has a reference to @kvm;
 * otherwise, returns an -EPERM.
 */
static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
<------><------><------><------>struct kvm *kvm)
{
<------>struct ap_matrix_mdev *m;
 
<------>mutex_lock(&matrix_dev->lock);
 
<------>list_for_each_entry(m, &matrix_dev->mdev_list, node) {
<------><------>if ((m != matrix_mdev) && (m->kvm == kvm)) {
<------><------><------>mutex_unlock(&matrix_dev->lock);
<------><------><------>return -EPERM;
<------><------>}
<------>}
 
<------>matrix_mdev->kvm = kvm;
<------>kvm_get_kvm(kvm);
<------>kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return 0;
}
 
/*
 * vfio_ap_mdev_iommu_notifier: IOMMU notifier callback
 *
 * @nb: The notifier block
 * @action: Action to be taken
 * @data: data associated with the request
 *
 * For an UNMAP request, unpin the guest IOVA (the NIB guest address we
 * pinned before). Other requests are ignored.
 *
 */
static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
<------><------><------><------>       unsigned long action, void *data)
{
<------>struct ap_matrix_mdev *matrix_mdev;
 
<------>matrix_mdev = container_of(nb, struct ap_matrix_mdev, iommu_notifier);
 
<------>if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
<------><------>struct vfio_iommu_type1_dma_unmap *unmap = data;
<------><------>unsigned long g_pfn = unmap->iova >> PAGE_SHIFT;
 
<------><------>vfio_unpin_pages(mdev_dev(matrix_mdev->mdev), &g_pfn, 1);
<------><------>return NOTIFY_OK;
<------>}
 
<------>return NOTIFY_DONE;
}
 
static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
<------><------><------><------>       unsigned long action, void *data)
{
<------>int ret;
<------>struct ap_matrix_mdev *matrix_mdev;
 
<------>if (action != VFIO_GROUP_NOTIFY_SET_KVM)
<------><------>return NOTIFY_OK;
 
<------>matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
 
<------>if (!data) {
<------><------>matrix_mdev->kvm = NULL;
<------><------>return NOTIFY_OK;
<------>}
 
<------>ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
<------>if (ret)
<------><------>return NOTIFY_DONE;
 
<------>/* If there is no CRYCB pointer, then we can't copy the masks */
<------>if (!matrix_mdev->kvm->arch.crypto.crycbd)
<------><------>return NOTIFY_DONE;
 
<------>kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
<------><------><------><------>  matrix_mdev->matrix.aqm,
<------><------><------><------>  matrix_mdev->matrix.adm);
 
<------>return NOTIFY_OK;
}
 
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
{
<------>struct device *dev;
<------>struct vfio_ap_queue *q = NULL;
 
<------>dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
<------><------><------><------> &apqn, match_apqn);
<------>if (dev) {
<------><------>q = dev_get_drvdata(dev);
<------><------>put_device(dev);
<------>}
 
<------>return q;
}
 
int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
<------><------><------>     unsigned int retry)
{
<------>struct ap_queue_status status;
<------>int ret;
<------>int retry2 = 2;
 
<------>if (!q)
<------><------>return 0;
 
retry_zapq:
<------>status = ap_zapq(q->apqn);
<------>switch (status.response_code) {
<------>case AP_RESPONSE_NORMAL:
<------><------>ret = 0;
<------><------>break;
<------>case AP_RESPONSE_RESET_IN_PROGRESS:
<------><------>if (retry--) {
<------><------><------>msleep(20);
<------><------><------>goto retry_zapq;
<------><------>}
<------><------>ret = -EBUSY;
<------><------>break;
<------>case AP_RESPONSE_Q_NOT_AVAIL:
<------>case AP_RESPONSE_DECONFIGURED:
<------>case AP_RESPONSE_CHECKSTOPPED:
<------><------>WARN_ON_ONCE(status.irq_enabled);
<------><------>ret = -EBUSY;
<------><------>goto free_resources;
<------>default:
<------><------>/* things are really broken, give up */
<------><------>WARN(true, "PQAP/ZAPQ completed with invalid rc (%x)\n",
<------><------>     status.response_code);
<------><------>return -EIO;
<------>}
 
<------>/* wait for the reset to take effect */
<------>while (retry2--) {
<------><------>if (status.queue_empty && !status.irq_enabled)
<------><------><------>break;
<------><------>msleep(20);
<------><------>status = ap_tapq(q->apqn, NULL);
<------>}
<------>WARN_ON_ONCE(retry2 <= 0);
 
free_resources:
<------>vfio_ap_free_aqic_resources(q);
 
<------>return ret;
}
 
static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
{
<------>int ret;
<------>int rc = 0;
<------>unsigned long apid, apqi;
<------>struct vfio_ap_queue *q;
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
<------><------><------>     matrix_mdev->matrix.apm_max + 1) {
<------><------>for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
<------><------><------><------>     matrix_mdev->matrix.aqm_max + 1) {
<------><------><------>q = vfio_ap_find_queue(AP_MKQID(apid, apqi));
<------><------><------>ret = vfio_ap_mdev_reset_queue(q, 1);
<------><------><------>/*
<------><------><------> * Regardless whether a queue turns out to be busy, or
<------><------><------> * is not operational, we need to continue resetting
<------><------><------> * the remaining queues.
<------><------><------> */
<------><------><------>if (ret)
<------><------><------><------>rc = ret;
<------><------>}
<------>}
 
<------>return rc;
}
 
static int vfio_ap_mdev_open(struct mdev_device *mdev)
{
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
<------>unsigned long events;
<------>int ret;
 
 
<------>if (!try_module_get(THIS_MODULE))
<------><------>return -ENODEV;
 
<------>matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
<------>events = VFIO_GROUP_NOTIFY_SET_KVM;
 
<------>ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
<------><------><------><------>     &events, &matrix_mdev->group_notifier);
<------>if (ret) {
<------><------>module_put(THIS_MODULE);
<------><------>return ret;
<------>}
 
<------>matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
<------>events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
<------>ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
<------><------><------><------>     &events, &matrix_mdev->iommu_notifier);
<------>if (!ret)
<------><------>return ret;
 
<------>vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
<------><------><------><------> &matrix_mdev->group_notifier);
<------>module_put(THIS_MODULE);
<------>return ret;
}
 
static void vfio_ap_mdev_release(struct mdev_device *mdev)
{
<------>struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
<------>mutex_lock(&matrix_dev->lock);
<------>if (matrix_mdev->kvm) {
<------><------>kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
<------><------>matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
<------><------>vfio_ap_mdev_reset_queues(mdev);
<------><------>kvm_put_kvm(matrix_mdev->kvm);
<------><------>matrix_mdev->kvm = NULL;
<------>}
<------>mutex_unlock(&matrix_dev->lock);
 
<------>vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
<------><------><------><------> &matrix_mdev->iommu_notifier);
<------>vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
<------><------><------><------> &matrix_mdev->group_notifier);
<------>module_put(THIS_MODULE);
}
 
static int vfio_ap_mdev_get_device_info(unsigned long arg)
{
<------>unsigned long minsz;
<------>struct vfio_device_info info;
 
<------>minsz = offsetofend(struct vfio_device_info, num_irqs);
 
<------>if (copy_from_user(&info, (void __user *)arg, minsz))
<------><------>return -EFAULT;
 
<------>if (info.argsz < minsz)
<------><------>return -EINVAL;
 
<------>info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
<------>info.num_regions = 0;
<------>info.num_irqs = 0;
 
<------>return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
}
 
static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
<------><------><------><------>    unsigned int cmd, unsigned long arg)
{
<------>int ret;
 
<------>mutex_lock(&matrix_dev->lock);
<------>switch (cmd) {
<------>case VFIO_DEVICE_GET_INFO:
<------><------>ret = vfio_ap_mdev_get_device_info(arg);
<------><------>break;
<------>case VFIO_DEVICE_RESET:
<------><------>ret = vfio_ap_mdev_reset_queues(mdev);
<------><------>break;
<------>default:
<------><------>ret = -EOPNOTSUPP;
<------><------>break;
<------>}
<------>mutex_unlock(&matrix_dev->lock);
 
<------>return ret;
}
 
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
<------>.owner			= THIS_MODULE,
<------>.supported_type_groups	= vfio_ap_mdev_type_groups,
<------>.mdev_attr_groups	= vfio_ap_mdev_attr_groups,
<------>.create			= vfio_ap_mdev_create,
<------>.remove			= vfio_ap_mdev_remove,
<------>.open			= vfio_ap_mdev_open,
<------>.release		= vfio_ap_mdev_release,
<------>.ioctl			= vfio_ap_mdev_ioctl,
};
 
int vfio_ap_mdev_register(void)
{
<------>atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
 
<------>return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
}
 
void vfio_ap_mdev_unregister(void)
{
<------>mdev_unregister_device(&matrix_dev->device);
}