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Implements the open callback on the mediated matrix device. The function registers a group notifier to receive notification of the VFIO_GROUP_NOTIFY_SET_KVM event. When notified, the vfio_ap device driver will get access to the guest's kvm structure. The open callback must ensure that only one mediated device shall be opened per guest. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20180925231641.4954-12-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Private data and functions for adjunct processor VFIO matrix driver.
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*
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* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
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* Halil Pasic <pasic@linux.ibm.com>
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*
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* Copyright IBM Corp. 2018
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*/
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#ifndef _VFIO_AP_PRIVATE_H_
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#define _VFIO_AP_PRIVATE_H_
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/mdev.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include "ap_bus.h"
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#define VFIO_AP_MODULE_NAME "vfio_ap"
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#define VFIO_AP_DRV_NAME "vfio_ap"
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/**
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* ap_matrix_dev - the AP matrix device structure
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* @device: generic device structure associated with the AP matrix device
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* @available_instances: number of mediated matrix devices that can be created
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* @info: the struct containing the output from the PQAP(QCI) instruction
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* mdev_list: the list of mediated matrix devices created
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* lock: mutex for locking the AP matrix device. This lock will be
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* taken every time we fiddle with state managed by the vfio_ap
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* driver, be it using @mdev_list or writing the state of a
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* single ap_matrix_mdev device. It's quite coarse but we don't
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* expect much contention.
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*/
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struct ap_matrix_dev {
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struct device device;
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atomic_t available_instances;
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struct ap_config_info info;
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struct list_head mdev_list;
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struct mutex lock;
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};
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extern struct ap_matrix_dev *matrix_dev;
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/**
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* The AP matrix is comprised of three bit masks identifying the adapters,
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* queues (domains) and control domains that belong to an AP matrix. The bits i
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* each mask, from least significant to most significant bit, correspond to IDs
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* 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
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*
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* @apm_max: max adapter number in @apm
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* @apm identifies the AP adapters in the matrix
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* @aqm_max: max domain number in @aqm
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* @aqm identifies the AP queues (domains) in the matrix
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* @adm_max: max domain number in @adm
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* @adm identifies the AP control domains in the matrix
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*/
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struct ap_matrix {
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unsigned long apm_max;
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DECLARE_BITMAP(apm, 256);
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unsigned long aqm_max;
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DECLARE_BITMAP(aqm, 256);
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unsigned long adm_max;
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DECLARE_BITMAP(adm, 256);
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};
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/**
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* struct ap_matrix_mdev - the mediated matrix device structure
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* @list: allows the ap_matrix_mdev struct to be added to a list
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* @matrix: the adapters, usage domains and control domains assigned to the
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* mediated matrix device.
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* @group_notifier: notifier block used for specifying callback function for
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* handling the VFIO_GROUP_NOTIFY_SET_KVM event
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* @kvm: the struct holding guest's state
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*/
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struct ap_matrix_mdev {
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struct list_head node;
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struct ap_matrix matrix;
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struct notifier_block group_notifier;
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struct kvm *kvm;
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};
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extern int vfio_ap_mdev_register(void);
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extern void vfio_ap_mdev_unregister(void);
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#endif /* _VFIO_AP_PRIVATE_H_ */
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