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  *            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  */
  39 struct 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
  48 extern 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  */
  63 struct 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  */
  81 struct 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         struct kvm *kvm;
  87         struct kvm_s390_module_hook pqap_hook;
  88         struct mdev_device *mdev;
  89 };
  90
  91 extern int vfio_ap_mdev_register(void);
  92 extern void vfio_ap_mdev_unregister(void);
  93 int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
  94                              unsigned int retry);
  95
  96 struct vfio_ap_queue {
  97         struct ap_matrix_mdev *matrix_mdev;
  98         unsigned long saved_pfn;
  99         int     apqn;
 100 #define VFIO_AP_ISC_INVALID 0xff
 101         unsigned char saved_isc;
 102 };
 103 struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q);
 104 #endif /* _VFIO_AP_PRIVATE_H_ */