mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 07:02:23 +00:00
258287c994
Implements the open callback on the mediated matrix device. The function registers a group notifier to receive notification of the VFIO_GROUP_NOTIFY_SET_KVM event. When notified, the vfio_ap device driver will get access to the guest's kvm structure. The open callback must ensure that only one mediated device shall be opened per guest. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20180925231641.4954-12-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/* 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>
|
|
*
|
|
* Copyright IBM Corp. 2018
|
|
*/
|
|
|
|
#ifndef _VFIO_AP_PRIVATE_H_
|
|
#define _VFIO_AP_PRIVATE_H_
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/device.h>
|
|
#include <linux/mdev.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#include "ap_bus.h"
|
|
|
|
#define VFIO_AP_MODULE_NAME "vfio_ap"
|
|
#define VFIO_AP_DRV_NAME "vfio_ap"
|
|
|
|
/**
|
|
* ap_matrix_dev - the AP matrix device structure
|
|
* @device: generic device structure associated with the AP matrix device
|
|
* @available_instances: number of mediated matrix devices that can be created
|
|
* @info: the struct containing the output from the PQAP(QCI) instruction
|
|
* mdev_list: the list of mediated matrix devices created
|
|
* 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.
|
|
*/
|
|
struct ap_matrix_dev {
|
|
struct device device;
|
|
atomic_t available_instances;
|
|
struct ap_config_info info;
|
|
struct list_head mdev_list;
|
|
struct mutex lock;
|
|
};
|
|
|
|
extern struct ap_matrix_dev *matrix_dev;
|
|
|
|
/**
|
|
* 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 i
|
|
* each mask, from least significant to most significant bit, correspond to IDs
|
|
* 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
|
|
*
|
|
* @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
|
|
*/
|
|
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_matrix_mdev - the mediated matrix device structure
|
|
* @list: 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.
|
|
* @group_notifier: notifier block used for specifying callback function for
|
|
* handling the VFIO_GROUP_NOTIFY_SET_KVM event
|
|
* @kvm: the struct holding guest's state
|
|
*/
|
|
struct ap_matrix_mdev {
|
|
struct list_head node;
|
|
struct ap_matrix matrix;
|
|
struct notifier_block group_notifier;
|
|
struct kvm *kvm;
|
|
};
|
|
|
|
extern int vfio_ap_mdev_register(void);
|
|
extern void vfio_ap_mdev_unregister(void);
|
|
|
|
#endif /* _VFIO_AP_PRIVATE_H_ */
|