LXR linux/drivers/s390/crypto/vfio_ap

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Private data and functions for adjunct processor VFIO matrix driver.
   4 *
   5 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
   6 *            Halil Pasic <pasic@linux.ibm.com>
   7 *            Pierre Morel <pmorel@linux.ibm.com>
   8 *
   9 * Copyright IBM Corp. 2018
  10 */
  11
  12#ifndef _VFIO_AP_PRIVATE_H_
  13#define _VFIO_AP_PRIVATE_H_
  14
  15#include <linux/types.h>
  16#include <linux/device.h>
  17#include <linux/mdev.h>
  18#include <linux/delay.h>
  19#include <linux/mutex.h>
  20#include <linux/kvm_host.h>
  21
  22#include "ap_bus.h"
  23
  24#define VFIO_AP_MODULE_NAME "vfio_ap"
  25#define VFIO_AP_DRV_NAME "vfio_ap"
  26
  27/**
  28 * ap_matrix_dev - the AP matrix device structure
  29 * @device:     generic device structure associated with the AP matrix device
  30 * @available_instances: number of mediated matrix devices that can be created
  31 * @info:       the struct containing the output from the PQAP(QCI) instruction
  32 * mdev_list:   the list of mediated matrix devices created
  33 * lock:        mutex for locking the AP matrix device. This lock will be
  34 *              taken every time we fiddle with state managed by the vfio_ap
  35 *              driver, be it using @mdev_list or writing the state of a
  36 *              single ap_matrix_mdev device. It's quite coarse but we don't
  37 *              expect much contention.
  38 */
  39struct ap_matrix_dev {
  40        struct device device;
  41        atomic_t available_instances;
  42        struct ap_config_info info;
  43        struct list_head mdev_list;
  44        struct mutex lock;
  45        struct ap_driver  *vfio_ap_drv;
  46};
  47
  48extern struct ap_matrix_dev *matrix_dev;
  49
  50/**
  51 * The AP matrix is comprised of three bit masks identifying the adapters,
  52 * queues (domains) and control domains that belong to an AP matrix. The bits i
  53 * each mask, from least significant to most significant bit, correspond to IDs
  54 * 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
  55 *
  56 * @apm_max: max adapter number in @apm
  57 * @apm identifies the AP adapters in the matrix
  58 * @aqm_max: max domain number in @aqm
  59 * @aqm identifies the AP queues (domains) in the matrix
  60 * @adm_max: max domain number in @adm
  61 * @adm identifies the AP control domains in the matrix
  62 */
  63struct ap_matrix {
  64        unsigned long apm_max;
  65        DECLARE_BITMAP(apm, 256);
  66        unsigned long aqm_max;
  67        DECLARE_BITMAP(aqm, 256);
  68        unsigned long adm_max;
  69        DECLARE_BITMAP(adm, 256);
  70};
  71
  72/**
  73 * struct ap_matrix_mdev - the mediated matrix device structure
  74 * @list:       allows the ap_matrix_mdev struct to be added to a list
  75 * @matrix:     the adapters, usage domains and control domains assigned to the
  76 *              mediated matrix device.
  77 * @group_notifier: notifier block used for specifying callback function for
  78 *                  handling the VFIO_GROUP_NOTIFY_SET_KVM event
  79 * @kvm:        the struct holding guest's state
  80 */
  81struct ap_matrix_mdev {
  82        struct list_head node;
  83        struct ap_matrix matrix;
  84        struct notifier_block group_notifier;
  85        struct notifier_block iommu_notifier;
  86        bool kvm_busy;
  87        wait_queue_head_t wait_for_kvm;
  88        struct kvm *kvm;
  89        struct kvm_s390_module_hook pqap_hook;
  90        struct mdev_device *mdev;
  91};
  92
  93struct vfio_ap_queue {
  94        struct ap_matrix_mdev *matrix_mdev;
  95        unsigned long saved_pfn;
  96        int     apqn;
  97#define VFIO_AP_ISC_INVALID 0xff
  98        unsigned char saved_isc;
  99};
 100
 101int vfio_ap_mdev_register(void);
 102void vfio_ap_mdev_unregister(void);
 103int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
 104                             unsigned int retry);
 105
 106#endif /* _VFIO_AP_PRIVATE_H_ */
 107