126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
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/* 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/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 <linux/kvm_host.h>
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#include <linux/vfio.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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* @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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* @vfio_ap_drv: the vfio_ap device driver
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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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struct ap_driver *vfio_ap_drv;
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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_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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* @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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* @iommu_notifier: notifier block used for specifying callback function for
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* handling the VFIO_IOMMU_NOTIFY_DMA_UNMAP even
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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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*/
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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 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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/**
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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_pfn: the guest PFN pinned for the guest
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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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*/
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struct vfio_ap_queue {
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struct ap_matrix_mdev *matrix_mdev;
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unsigned long saved_pfn;
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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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};
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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_reset_queue(struct vfio_ap_queue *q,
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unsigned int retry);
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#endif /* _VFIO_AP_PRIVATE_H_ */
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