159 lines
5.3 KiB
C
159 lines
5.3 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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* Pierre Morel <pmorel@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/mdev.h>
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#include <linux/delay.h>
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#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 <linux/hashtable.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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* struct ap_matrix_dev - Contains the data for the matrix device.
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*
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* @device: generic device structure associated with the AP matrix device
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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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* @mdevs_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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* @vfio_ap_drv: the vfio_ap device driver
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* @guests_lock: mutex for controlling access to a guest that is using AP
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* devices passed through by the vfio_ap device driver. This lock
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* will be taken when the AP devices are plugged into or unplugged
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* from a guest, and when an ap_matrix_mdev device is added to or
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* removed from @mdev_list or the list is iterated.
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*/
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struct ap_matrix_dev {
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struct device device;
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struct ap_config_info info;
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struct list_head mdev_list;
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struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */
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struct ap_driver *vfio_ap_drv;
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struct mutex guests_lock; /* serializes access to each KVM guest */
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struct mdev_parent parent;
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struct mdev_type mdev_type;
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struct mdev_type *mdev_types[1];
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};
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extern struct ap_matrix_dev *matrix_dev;
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/**
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* struct ap_matrix - matrix of adapters, domains and control domains
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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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* 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 in
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* each mask, from left to right, correspond to IDs 0 to 255. When a bit is set
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* the corresponding ID belongs to 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_queue_table - a table of queue objects.
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*
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* @queues: a hashtable of queues (struct vfio_ap_queue).
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*/
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struct ap_queue_table {
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DECLARE_HASHTABLE(queues, 8);
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};
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/**
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* struct ap_matrix_mdev - Contains the data associated with a matrix mediated
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* device.
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* @vdev: the vfio device
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* @node: 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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* @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB
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* @kvm: the struct holding guest's state
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* @pqap_hook: the function pointer to the interception handler for the
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* PQAP(AQIC) instruction.
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* @mdev: the mediated device
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* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
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* @apm_add: bitmap of APIDs added to the host's AP configuration
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* @aqm_add: bitmap of APQIs added to the host's AP configuration
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* @adm_add: bitmap of control domain numbers added to the host's AP
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* configuration
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*/
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struct ap_matrix_mdev {
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struct vfio_device vdev;
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struct list_head node;
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struct ap_matrix matrix;
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struct ap_matrix shadow_apcb;
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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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struct ap_queue_table qtable;
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DECLARE_BITMAP(apm_add, AP_DEVICES);
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DECLARE_BITMAP(aqm_add, AP_DOMAINS);
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DECLARE_BITMAP(adm_add, AP_DOMAINS);
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};
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/**
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* struct vfio_ap_queue - contains the data associated with a queue bound to the
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* vfio_ap device driver
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* @matrix_mdev: the matrix mediated device
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* @saved_iova: the notification indicator byte (nib) address
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* @apqn: the APQN of the AP queue device
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* @saved_isc: the guest ISC registered with the GIB interface
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* @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable
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* @reset_rc: the status response code from the last reset of the queue
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*/
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struct vfio_ap_queue {
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struct ap_matrix_mdev *matrix_mdev;
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dma_addr_t saved_iova;
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int apqn;
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#define VFIO_AP_ISC_INVALID 0xff
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unsigned char saved_isc;
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struct hlist_node mdev_qnode;
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unsigned int reset_rc;
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};
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int vfio_ap_mdev_register(void);
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void vfio_ap_mdev_unregister(void);
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int vfio_ap_mdev_probe_queue(struct ap_device *queue);
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void vfio_ap_mdev_remove_queue(struct ap_device *queue);
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int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
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void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
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struct ap_config_info *old_config_info);
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void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
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struct ap_config_info *old_config_info);
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#endif /* _VFIO_AP_PRIVATE_H_ */
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