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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 >
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* Halil Pasic < pasic @ linux . ibm . com >
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* Pierre Morel < pmorel @ linux . ibm . com >
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*
* 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>
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# include <linux/kvm_host.h>
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# include <linux/vfio.h>
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# 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
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* @ 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 .
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*/
struct ap_matrix_dev {
struct device device ;
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atomic_t available_instances ;
struct ap_config_info info ;
struct list_head mdev_list ;
struct mutex lock ;
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struct ap_driver * vfio_ap_drv ;
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} ;
extern struct ap_matrix_dev * matrix_dev ;
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/**
* 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 .
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* @ 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
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*/
struct ap_matrix_mdev {
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struct vfio_device vdev ;
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struct list_head node ;
struct ap_matrix matrix ;
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struct notifier_block group_notifier ;
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struct notifier_block iommu_notifier ;
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struct kvm * kvm ;
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crypto_hook pqap_hook ;
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struct mdev_device * mdev ;
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} ;
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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 ;
} ;
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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 ) ;
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# endif /* _VFIO_AP_PRIVATE_H_ */