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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Private data and functions for adjunct processor VFIO matrix driver.
*
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
* Halil Pasic <pasic@linux.ibm.com>
* Pierre Morel <pmorel@linux.ibm.com>
*
* Copyright IBM Corp. 2018
*/
#ifndef _VFIO_AP_PRIVATE_H_
#define _VFIO_AP_PRIVATE_H_
#include <linux/types.h>
#include <linux/mdev.h>
#include <linux/delay.h>
#include <linux/eventfd.h>
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include <linux/vfio.h>
#include <linux/hashtable.h>
#include "ap_bus.h"
#define VFIO_AP_MODULE_NAME "vfio_ap"
#define VFIO_AP_DRV_NAME "vfio_ap"
/**
* struct ap_matrix_dev - Contains the data for the matrix device.
*
* @device: generic device structure associated with the AP matrix device
* @info: the struct containing the output from the PQAP(QCI) instruction
* @mdev_list: the list of mediated matrix devices created
* @mdevs_lock: mutex for locking the AP matrix device. This lock will be
* taken every time we fiddle with state managed by the vfio_ap
* driver, be it using @mdev_list or writing the state of a
* single ap_matrix_mdev device. It's quite coarse but we don't
* expect much contention.
* @vfio_ap_drv: the vfio_ap device driver
* @guests_lock: mutex for controlling access to a guest that is using AP
* devices passed through by the vfio_ap device driver. This lock
* will be taken when the AP devices are plugged into or unplugged
* from a guest, and when an ap_matrix_mdev device is added to or
* removed from @mdev_list or the list is iterated.
*/
struct ap_matrix_dev {
struct device device;
struct ap_config_info info;
struct list_head mdev_list;
struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */
struct ap_driver *vfio_ap_drv;
struct mutex guests_lock; /* serializes access to each KVM guest */
struct mdev_parent parent;
struct mdev_type mdev_type;
struct mdev_type *mdev_types[1];
};
extern struct ap_matrix_dev *matrix_dev;
/**
* struct ap_matrix - matrix of adapters, domains and control domains
*
* @apm_max: max adapter number in @apm
* @apm: identifies the AP adapters in the matrix
* @aqm_max: max domain number in @aqm
* @aqm: identifies the AP queues (domains) in the matrix
* @adm_max: max domain number in @adm
* @adm: identifies the AP control domains in the matrix
*
* The AP matrix is comprised of three bit masks identifying the adapters,
* queues (domains) and control domains that belong to an AP matrix. The bits in
* each mask, from left to right, correspond to IDs 0 to 255. When a bit is set
* the corresponding ID belongs to the matrix.
*/
struct ap_matrix {
unsigned long apm_max;
DECLARE_BITMAP(apm, 256);
unsigned long aqm_max;
DECLARE_BITMAP(aqm, 256);
unsigned long adm_max;
DECLARE_BITMAP(adm, 256);
};
/**
* struct ap_queue_table - a table of queue objects.
*
* @queues: a hashtable of queues (struct vfio_ap_queue).
*/
struct ap_queue_table {
DECLARE_HASHTABLE(queues, 8);
};
/**
* struct ap_matrix_mdev - Contains the data associated with a matrix mediated
* device.
* @vdev: the vfio device
* @node: allows the ap_matrix_mdev struct to be added to a list
* @matrix: the adapters, usage domains and control domains assigned to the
* mediated matrix device.
* @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB
* @kvm: the struct holding guest's state
* @pqap_hook: the function pointer to the interception handler for the
* PQAP(AQIC) instruction.
* @mdev: the mediated device
* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
* @req_trigger eventfd ctx for signaling userspace to return a device
* @apm_add: bitmap of APIDs added to the host's AP configuration
* @aqm_add: bitmap of APQIs added to the host's AP configuration
* @adm_add: bitmap of control domain numbers added to the host's AP
* configuration
*/
struct ap_matrix_mdev {
struct vfio_device vdev;
struct list_head node;
struct ap_matrix matrix;
struct ap_matrix shadow_apcb;
struct kvm *kvm;
crypto_hook pqap_hook;
struct mdev_device *mdev;
struct ap_queue_table qtable;
struct eventfd_ctx *req_trigger;
DECLARE_BITMAP(apm_add, AP_DEVICES);
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
DECLARE_BITMAP(adm_add, AP_DOMAINS);
};
/**
* struct vfio_ap_queue - contains the data associated with a queue bound to the
* vfio_ap device driver
* @matrix_mdev: the matrix mediated device
* @saved_iova: the notification indicator byte (nib) address
* @apqn: the APQN of the AP queue device
* @saved_isc: the guest ISC registered with the GIB interface
* @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable
* @reset_status: the status from the last reset of the queue
* @reset_work: work to wait for queue reset to complete
*/
struct vfio_ap_queue {
struct ap_matrix_mdev *matrix_mdev;
dma_addr_t saved_iova;
int apqn;
#define VFIO_AP_ISC_INVALID 0xff
unsigned char saved_isc;
struct hlist_node mdev_qnode;
struct ap_queue_status reset_status;
struct work_struct reset_work;
};
int vfio_ap_mdev_register(void);
void vfio_ap_mdev_unregister(void);
int vfio_ap_mdev_probe_queue(struct ap_device *queue);
void vfio_ap_mdev_remove_queue(struct ap_device *queue);
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
#endif /* _VFIO_AP_PRIVATE_H_ */
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