drivers/s390/crypto/vfio_ap_private.h

   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  *
   8  * Copyright IBM Corp. 2018
   9  */
  10
  11 #ifndef _VFIO_AP_PRIVATE_H_
  12 #define _VFIO_AP_PRIVATE_H_
  13
  14 #include <linux/types.h>
  15 #include <linux/device.h>
  16 #include <linux/mdev.h>
  17 #include <linux/delay.h>
  18 #include <linux/mutex.h>
  19
  20 #include "ap_bus.h"
  21
  22 #define VFIO_AP_MODULE_NAME "vfio_ap"
  23 #define VFIO_AP_DRV_NAME "vfio_ap"
  24
  25 /**
  26  * ap_matrix_dev - the AP matrix device structure
  27  * @device:     generic device structure associated with the AP matrix device
  28  * @available_instances: number of mediated matrix devices that can be created
  29  * @info:       the struct containing the output from the PQAP(QCI) instruction
  30  * mdev_list:   the list of mediated matrix devices created
  31  * lock:        mutex for locking the AP matrix device. This lock will be
  32  *              taken every time we fiddle with state managed by the vfio_ap
  33  *              driver, be it using @mdev_list or writing the state of a
  34  *              single ap_matrix_mdev device. It's quite coarse but we don't
  35  *              expect much contention.
  36  */
  37 struct ap_matrix_dev {
  38         struct device device;
  39         atomic_t available_instances;
  40         struct ap_config_info info;
  41         struct list_head mdev_list;
  42         struct mutex lock;
  43         struct ap_driver  *vfio_ap_drv;
  44 };
  45
  46 extern struct ap_matrix_dev *matrix_dev;
  47
  48 /**
  49  * The AP matrix is comprised of three bit masks identifying the adapters,
  50  * queues (domains) and control domains that belong to an AP matrix. The bits i
  51  * each mask, from least significant to most significant bit, correspond to IDs
  52  * 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
  53  *
  54  * @apm_max: max adapter number in @apm
  55  * @apm identifies the AP adapters in the matrix
  56  * @aqm_max: max domain number in @aqm
  57  * @aqm identifies the AP queues (domains) in the matrix
  58  * @adm_max: max domain number in @adm
  59  * @adm identifies the AP control domains in the matrix
  60  */
  61 struct ap_matrix {
  62         unsigned long apm_max;
  63         DECLARE_BITMAP(apm, 256);
  64         unsigned long aqm_max;
  65         DECLARE_BITMAP(aqm, 256);
  66         unsigned long adm_max;
  67         DECLARE_BITMAP(adm, 256);
  68 };
  69
  70 /**
  71  * struct ap_matrix_mdev - the mediated matrix device structure
  72  * @list:       allows the ap_matrix_mdev struct to be added to a list
  73  * @matrix:     the adapters, usage domains and control domains assigned to the
  74  *              mediated matrix device.
  75  * @group_notifier: notifier block used for specifying callback function for
  76  *                  handling the VFIO_GROUP_NOTIFY_SET_KVM event
  77  * @kvm:        the struct holding guest's state
  78  */
  79 struct ap_matrix_mdev {
  80         struct list_head node;
  81         struct ap_matrix matrix;
  82         struct notifier_block group_notifier;
  83         struct kvm *kvm;
  84 };
  85
  86 extern int vfio_ap_mdev_register(void);
  87 extern void vfio_ap_mdev_unregister(void);
  88
  89 #endif /* _VFIO_AP_PRIVATE_H_ */