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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;
- 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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