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_ */ 90