/* 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/mdev.h>
#include <linux/delay.h>
#include <linux/eventfd.h>
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include <linux/vfio.h>
#include <linux/hashtable.h>
#include "ap_bus.h"
#define VFIO_AP_MODULE_NAME "vfio_ap"
#define VFIO_AP_DRV_NAME "vfio_ap"
/**
* struct ap_matrix_dev - Contains the data for the matrix device .
*
* @ device : generic device structure associated with the AP matrix device
* @ info : the struct containing the output from the PQAP ( QCI ) instruction
* @ mdev_list : the list of mediated matrix devices created
* @ mdevs_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 .
* @ vfio_ap_drv : the vfio_ap device driver
* @ guests_lock : mutex for controlling access to a guest that is using AP
* devices passed through by the vfio_ap device driver . This lock
* will be taken when the AP devices are plugged into or unplugged
* from a guest , and when an ap_matrix_mdev device is added to or
* removed from @ mdev_list or the list is iterated .
*/
struct ap_matrix_dev {
struct device device;
struct ap_config_info info;
struct list_head mdev_list;
struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */
struct ap_driver *vfio_ap_drv;
struct mutex guests_lock; /* serializes access to each KVM guest */
struct mdev_parent parent;
struct mdev_type mdev_type;
struct mdev_type *mdev_types;
};
extern struct ap_matrix_dev *matrix_dev;
/**
* struct ap_matrix - matrix of adapters , domains and control domains
*
* @ 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
*
* 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 in
* each mask , from left to right , correspond to IDs 0 to 255 . When a bit is set
* the corresponding ID belongs to the matrix .
*/
struct ap_matrix {
unsigned long apm_max;
DECLARE_BITMAP(apm, AP_DEVICES);
unsigned long aqm_max;
DECLARE_BITMAP(aqm, AP_DOMAINS);
unsigned long adm_max;
DECLARE_BITMAP(adm, AP_DOMAINS);
};
/**
* struct ap_queue_table - a table of queue objects .
*
* @ queues : a hashtable of queues ( struct vfio_ap_queue ) .
*/
struct ap_queue_table {
DECLARE_HASHTABLE(queues, 8 );
};
/**
* struct ap_matrix_mdev - Contains the data associated with a matrix mediated
* device .
* @ vdev : the vfio device
* @ node : 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 .
* @ shadow_apcb : the shadow copy of the APCB field of the KVM guest ' s CRYCB
* @ kvm : the struct holding guest ' s state
* @ pqap_hook : the function pointer to the interception handler for the
* PQAP ( AQIC ) instruction .
* @ mdev : the mediated device
* @ qtable : table of queues ( struct vfio_ap_queue ) assigned to the mdev
* @ req_trigger eventfd ctx for signaling userspace to return a device
* @ cfg_chg_trigger eventfd ctx to signal AP config changed to userspace
* @ apm_add : bitmap of APIDs added to the host ' s AP configuration
* @ aqm_add : bitmap of APQIs added to the host ' s AP configuration
* @ adm_add : bitmap of control domain numbers added to the host ' s AP
* configuration
*/
struct ap_matrix_mdev {
struct vfio_device vdev;
struct list_head node;
struct ap_matrix matrix;
struct ap_matrix shadow_apcb;
struct kvm *kvm;
crypto_hook pqap_hook;
struct mdev_device *mdev;
struct ap_queue_table qtable;
struct eventfd_ctx *req_trigger;
struct eventfd_ctx *cfg_chg_trigger;
DECLARE_BITMAP(apm_add, AP_DEVICES);
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
DECLARE_BITMAP(adm_add, AP_DOMAINS);
};
/**
* struct vfio_ap_queue - contains the data associated with a queue bound to the
* vfio_ap device driver
* @ matrix_mdev : the matrix mediated device
* @ saved_iova : the notification indicator byte ( nib ) address
* @ apqn : the APQN of the AP queue device
* @ saved_isc : the guest ISC registered with the GIB interface
* @ mdev_qnode : allows the vfio_ap_queue struct to be added to a hashtable
* @ reset_qnode : allows the vfio_ap_queue struct to be added to a list of queues
* that need to be reset
* @ reset_status : the status from the last reset of the queue
* @ reset_work : work to wait for queue reset to complete
*/
struct vfio_ap_queue {
struct ap_matrix_mdev *matrix_mdev;
dma_addr_t saved_iova;
int apqn;
#define VFIO_AP_ISC_INVALID 0 xff
unsigned char saved_isc;
struct hlist_node mdev_qnode;
struct list_head reset_qnode;
struct ap_queue_status reset_status;
struct work_struct reset_work;
};
int vfio_ap_mdev_register(void );
void vfio_ap_mdev_unregister(void );
int vfio_ap_mdev_probe_queue(struct ap_device *queue);
void vfio_ap_mdev_remove_queue(struct ap_device *queue);
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
#endif /* _VFIO_AP_PRIVATE_H_ */
Messung V0.5 in Prozent C=95 H=100 G=97
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-09-27)
¤
*© Formatika GbR, Deutschland