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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Private data and functions for adjunct processor VFIO matrix driver.
*
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
* Halil Pasic <pasic@linux.ibm.com>
* Pierre Morel <pmorel@linux.ibm.com>
*
* Copyright IBM Corp. 2018
*/
#ifndef _VFIO_AP_PRIVATE_H_
#define _VFIO_AP_PRIVATE_H_
#include <linux/types.h>
#include <linux/device.h>
#include <linux/mdev.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include "ap_bus.h"
#define VFIO_AP_MODULE_NAME "vfio_ap"
#define VFIO_AP_DRV_NAME "vfio_ap"
/**
* ap_matrix_dev - the AP matrix device structure
* @device: generic device structure associated with the AP matrix device
* @available_instances: number of mediated matrix devices that can be created
* @info: the struct containing the output from the PQAP(QCI) instruction
* mdev_list: the list of mediated matrix devices created
* lock: mutex for locking the AP matrix device. This lock will be
* taken every time we fiddle with state managed by the vfio_ap
* driver, be it using @mdev_list or writing the state of a
* single ap_matrix_mdev device. It's quite coarse but we don't
* expect much contention.
*/
struct ap_matrix_dev {
struct device device;
atomic_t available_instances;
struct ap_config_info info;
struct list_head mdev_list;
struct mutex lock;
struct ap_driver *vfio_ap_drv;
};
extern struct ap_matrix_dev *matrix_dev;
/**
* The AP matrix is comprised of three bit masks identifying the adapters,
* queues (domains) and control domains that belong to an AP matrix. The bits i
* each mask, from least significant to most significant bit, correspond to IDs
* 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
*
* @apm_max: max adapter number in @apm
* @apm identifies the AP adapters in the matrix
* @aqm_max: max domain number in @aqm
* @aqm identifies the AP queues (domains) in the matrix
* @adm_max: max domain number in @adm
* @adm identifies the AP control domains in the matrix
*/
struct ap_matrix {
unsigned long apm_max;
DECLARE_BITMAP(apm, 256);
unsigned long aqm_max;
DECLARE_BITMAP(aqm, 256);
unsigned long adm_max;
DECLARE_BITMAP(adm, 256);
};
/**
* struct ap_matrix_mdev - the mediated matrix device structure
* @list: allows the ap_matrix_mdev struct to be added to a list
* @matrix: the adapters, usage domains and control domains assigned to the
* mediated matrix device.
* @group_notifier: notifier block used for specifying callback function for
* handling the VFIO_GROUP_NOTIFY_SET_KVM event
* @kvm: the struct holding guest's state
*/
struct ap_matrix_mdev {
struct list_head node;
struct ap_matrix matrix;
struct notifier_block group_notifier;
struct notifier_block iommu_notifier;
bool kvm_busy;
wait_queue_head_t wait_for_kvm;
struct kvm *kvm;
struct kvm_s390_module_hook pqap_hook;
struct mdev_device *mdev;
};
struct vfio_ap_queue {
struct ap_matrix_mdev *matrix_mdev;
unsigned long saved_pfn;
int apqn;
#define VFIO_AP_ISC_INVALID 0xff
unsigned char saved_isc;
};
int vfio_ap_mdev_register(void);
void vfio_ap_mdev_unregister(void);
int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
unsigned int retry);
#endif /* _VFIO_AP_PRIVATE_H_ */
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