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/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 device
 33 * @info:	the struct containing the output from the PQAP(QCI) instruction
 34 * @mdev_list:	the list of mediated matrix devices created
 35 * @mdevs_lock: mutex for locking the AP matrix device. This lock will be
 36 *		taken every time we fiddle with state managed by the vfio_ap
 37 *		driver, be it using @mdev_list or writing the state of a
 38 *		single ap_matrix_mdev device. It's quite coarse but we don't
 39 *		expect much contention.
 40 * @vfio_ap_drv: the vfio_ap device driver
 41 * @guests_lock: mutex for controlling access to a guest that is using AP
 42 *		 devices passed through by the vfio_ap device driver. This lock
 43 *		 will be taken when the AP devices are plugged into or unplugged
 44 *		 from a guest, and when an ap_matrix_mdev device is added to or
 45 *		 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;
 57};
 58
 59extern struct ap_matrix_dev *matrix_dev;
 60
 61/**
 62 * struct ap_matrix - matrix of adapters, domains and control domains
 63 *
 64 * @apm_max: max adapter number in @apm
 65 * @apm: identifies the AP adapters in the matrix
 66 * @aqm_max: max domain number in @aqm
 67 * @aqm: identifies the AP queues (domains) in the matrix
 68 * @adm_max: max domain number in @adm
 69 * @adm: identifies the AP control domains in the matrix
 70 *
 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 in
 73 * each mask, from left to right, correspond to IDs 0 to 255. When a bit is set
 74 * 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 mediated
 96 *			   device.
 97 * @vdev:	the vfio device
 98 * @node:	allows the ap_matrix_mdev struct to be added to a list
 99 * @matrix:	the adapters, usage domains and control domains assigned to the
100 *		mediated matrix device.
101 * @shadow_apcb:    the shadow copy of the APCB field of the KVM guest's CRYCB
102 * @kvm:	the struct holding guest's state
103 * @pqap_hook:	the function pointer to the interception handler for the
104 *		PQAP(AQIC) instruction.
105 * @mdev:	the mediated device
106 * @qtable:	table of queues (struct vfio_ap_queue) assigned to the mdev
107 * @req_trigger eventfd ctx for signaling userspace to return a device
108 * @cfg_chg_trigger eventfd ctx to signal AP config changed to userspace
109 * @apm_add:	bitmap of APIDs added to the host's AP configuration
110 * @aqm_add:	bitmap of APQIs added to the host's AP configuration
111 * @adm_add:	bitmap of control domain numbers added to the host's AP
112 *		configuration
113 */
114struct ap_matrix_mdev {
115	struct vfio_device vdev;
116	struct list_head node;
117	struct ap_matrix matrix;
118	struct ap_matrix shadow_apcb;
119	struct kvm *kvm;
120	crypto_hook pqap_hook;
121	struct mdev_device *mdev;
122	struct ap_queue_table qtable;
123	struct eventfd_ctx *req_trigger;
124	struct eventfd_ctx *cfg_chg_trigger;
125	DECLARE_BITMAP(apm_add, AP_DEVICES);
126	DECLARE_BITMAP(aqm_add, AP_DOMAINS);
127	DECLARE_BITMAP(adm_add, AP_DOMAINS);
128};
129
130/**
131 * struct vfio_ap_queue - contains the data associated with a queue bound to the
132 *			  vfio_ap device driver
133 * @matrix_mdev: the matrix mediated device
134 * @saved_iova: the notification indicator byte (nib) address
135 * @apqn: the APQN of the AP queue device
136 * @saved_isc: the guest ISC registered with the GIB interface
137 * @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable
138 * @reset_qnode: allows the vfio_ap_queue struct to be added to a list of queues
139 *		 that need to be reset
140 * @reset_status: the status from the last reset of the queue
141 * @reset_work: work to wait for queue reset to complete
142 */
143struct vfio_ap_queue {
144	struct ap_matrix_mdev *matrix_mdev;
145	dma_addr_t saved_iova;
146	int	apqn;
147#define VFIO_AP_ISC_INVALID 0xff
148	unsigned char saved_isc;
149	struct hlist_node mdev_qnode;
150	struct list_head reset_qnode;
151	struct ap_queue_status reset_status;
152	struct work_struct reset_work;
153};
154
155int vfio_ap_mdev_register(void);
156void vfio_ap_mdev_unregister(void);
157
158int vfio_ap_mdev_probe_queue(struct ap_device *queue);
159void vfio_ap_mdev_remove_queue(struct ap_device *queue);
160
161int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
162
163void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
164			    struct ap_config_info *old_config_info);
165void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
166			      struct ap_config_info *old_config_info);
167
168#endif /* _VFIO_AP_PRIVATE_H_ */