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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. 201810 */11 12#ifndef _VFIO_AP_PRIVATE_H_13#define _VFIO_AP_PRIVATE_H_14 15#include <linux/types.h>16#include <linux/mdev.h>17#include <linux/delay.h>18#include <linux/eventfd.h>19#include <linux/mutex.h>20#include <linux/kvm_host.h>21#include <linux/vfio.h>22#include <linux/hashtable.h>23 24#include "ap_bus.h"25 26#define VFIO_AP_MODULE_NAME "vfio_ap"27#define VFIO_AP_DRV_NAME "vfio_ap"28 29/**30 * struct ap_matrix_dev - Contains the data for the matrix device.31 *32 * @device: generic device structure associated with the AP matrix device33 * @info: the struct containing the output from the PQAP(QCI) instruction34 * @mdev_list: the list of mediated matrix devices created35 * @mdevs_lock: mutex for locking the AP matrix device. This lock will be36 * taken every time we fiddle with state managed by the vfio_ap37 * driver, be it using @mdev_list or writing the state of a38 * single ap_matrix_mdev device. It's quite coarse but we don't39 * expect much contention.40 * @vfio_ap_drv: the vfio_ap device driver41 * @guests_lock: mutex for controlling access to a guest that is using AP42 * devices passed through by the vfio_ap device driver. This lock43 * will be taken when the AP devices are plugged into or unplugged44 * from a guest, and when an ap_matrix_mdev device is added to or45 * removed from @mdev_list or the list is iterated.46 */47struct ap_matrix_dev {48 struct device device;49 struct ap_config_info info;50 struct list_head mdev_list;51 struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */52 struct ap_driver *vfio_ap_drv;53 struct mutex guests_lock; /* serializes access to each KVM guest */54 struct mdev_parent parent;55 struct mdev_type mdev_type;56 struct mdev_type *mdev_types[1];57};58 59extern struct ap_matrix_dev *matrix_dev;60 61/**62 * struct ap_matrix - matrix of adapters, domains and control domains63 *64 * @apm_max: max adapter number in @apm65 * @apm: identifies the AP adapters in the matrix66 * @aqm_max: max domain number in @aqm67 * @aqm: identifies the AP queues (domains) in the matrix68 * @adm_max: max domain number in @adm69 * @adm: identifies the AP control domains in the matrix70 *71 * The AP matrix is comprised of three bit masks identifying the adapters,72 * queues (domains) and control domains that belong to an AP matrix. The bits in73 * each mask, from left to right, correspond to IDs 0 to 255. When a bit is set74 * the corresponding ID belongs to the matrix.75 */76struct ap_matrix {77 unsigned long apm_max;78 DECLARE_BITMAP(apm, AP_DEVICES);79 unsigned long aqm_max;80 DECLARE_BITMAP(aqm, AP_DOMAINS);81 unsigned long adm_max;82 DECLARE_BITMAP(adm, AP_DOMAINS);83};84 85/**86 * struct ap_queue_table - a table of queue objects.87 *88 * @queues: a hashtable of queues (struct vfio_ap_queue).89 */90struct ap_queue_table {91 DECLARE_HASHTABLE(queues, 8);92};93 94/**95 * struct ap_matrix_mdev - Contains the data associated with a matrix mediated96 * device.97 * @vdev: the vfio device98 * @node: allows the ap_matrix_mdev struct to be added to a list99 * @matrix: the adapters, usage domains and control domains assigned to the100 * mediated matrix device.101 * @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB102 * @kvm: the struct holding guest's state103 * @pqap_hook: the function pointer to the interception handler for the104 * PQAP(AQIC) instruction.105 * @mdev: the mediated device106 * @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev107 * @req_trigger eventfd ctx for signaling userspace to return a device108 * @apm_add: bitmap of APIDs added to the host's AP configuration109 * @aqm_add: bitmap of APQIs added to the host's AP configuration110 * @adm_add: bitmap of control domain numbers added to the host's AP111 * configuration112 */113struct ap_matrix_mdev {114 struct vfio_device vdev;115 struct list_head node;116 struct ap_matrix matrix;117 struct ap_matrix shadow_apcb;118 struct kvm *kvm;119 crypto_hook pqap_hook;120 struct mdev_device *mdev;121 struct ap_queue_table qtable;122 struct eventfd_ctx *req_trigger;123 DECLARE_BITMAP(apm_add, AP_DEVICES);124 DECLARE_BITMAP(aqm_add, AP_DOMAINS);125 DECLARE_BITMAP(adm_add, AP_DOMAINS);126};127 128/**129 * struct vfio_ap_queue - contains the data associated with a queue bound to the130 * vfio_ap device driver131 * @matrix_mdev: the matrix mediated device132 * @saved_iova: the notification indicator byte (nib) address133 * @apqn: the APQN of the AP queue device134 * @saved_isc: the guest ISC registered with the GIB interface135 * @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable136 * @reset_qnode: allows the vfio_ap_queue struct to be added to a list of queues137 * that need to be reset138 * @reset_status: the status from the last reset of the queue139 * @reset_work: work to wait for queue reset to complete140 */141struct vfio_ap_queue {142 struct ap_matrix_mdev *matrix_mdev;143 dma_addr_t saved_iova;144 int apqn;145#define VFIO_AP_ISC_INVALID 0xff146 unsigned char saved_isc;147 struct hlist_node mdev_qnode;148 struct list_head reset_qnode;149 struct ap_queue_status reset_status;150 struct work_struct reset_work;151};152 153int vfio_ap_mdev_register(void);154void vfio_ap_mdev_unregister(void);155 156int vfio_ap_mdev_probe_queue(struct ap_device *queue);157void vfio_ap_mdev_remove_queue(struct ap_device *queue);158 159int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);160 161void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,162 struct ap_config_info *old_config_info);163void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,164 struct ap_config_info *old_config_info);165 166#endif /* _VFIO_AP_PRIVATE_H_ */167