1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Private data and functions for adjunct processor VFIO matrix driver.
9 * Copyright IBM Corp. 2018
12 #ifndef _VFIO_AP_PRIVATE_H_
13 #define _VFIO_AP_PRIVATE_H_
15 #include <linux/types.h>
16 #include <linux/mdev.h>
17 #include <linux/delay.h>
18 #include <linux/mutex.h>
19 #include <linux/kvm_host.h>
20 #include <linux/vfio.h>
21 #include <linux/hashtable.h>
25 #define VFIO_AP_MODULE_NAME "vfio_ap"
26 #define VFIO_AP_DRV_NAME "vfio_ap"
29 * struct ap_matrix_dev - Contains the data for the matrix device.
31 * @device: generic device structure associated with the AP matrix device
32 * @info: the struct containing the output from the PQAP(QCI) instruction
33 * @mdev_list: the list of mediated matrix devices created
34 * @mdevs_lock: mutex for locking the AP matrix device. This lock will be
35 * taken every time we fiddle with state managed by the vfio_ap
36 * driver, be it using @mdev_list or writing the state of a
37 * single ap_matrix_mdev device. It's quite coarse but we don't
38 * expect much contention.
39 * @vfio_ap_drv: the vfio_ap device driver
40 * @guests_lock: mutex for controlling access to a guest that is using AP
41 * devices passed through by the vfio_ap device driver. This lock
42 * will be taken when the AP devices are plugged into or unplugged
43 * from a guest, and when an ap_matrix_mdev device is added to or
44 * removed from @mdev_list or the list is iterated.
46 struct ap_matrix_dev {
48 struct ap_config_info info;
49 struct list_head mdev_list;
50 struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */
51 struct ap_driver *vfio_ap_drv;
52 struct mutex guests_lock; /* serializes access to each KVM guest */
53 struct mdev_parent parent;
54 struct mdev_type mdev_type;
55 struct mdev_type *mdev_types[1];
58 extern struct ap_matrix_dev *matrix_dev;
61 * struct ap_matrix - matrix of adapters, domains and control domains
63 * @apm_max: max adapter number in @apm
64 * @apm: identifies the AP adapters in the matrix
65 * @aqm_max: max domain number in @aqm
66 * @aqm: identifies the AP queues (domains) in the matrix
67 * @adm_max: max domain number in @adm
68 * @adm: identifies the AP control domains in the matrix
70 * The AP matrix is comprised of three bit masks identifying the adapters,
71 * queues (domains) and control domains that belong to an AP matrix. The bits in
72 * each mask, from left to right, correspond to IDs 0 to 255. When a bit is set
73 * the corresponding ID belongs to the matrix.
76 unsigned long apm_max;
77 DECLARE_BITMAP(apm, 256);
78 unsigned long aqm_max;
79 DECLARE_BITMAP(aqm, 256);
80 unsigned long adm_max;
81 DECLARE_BITMAP(adm, 256);
85 * struct ap_queue_table - a table of queue objects.
87 * @queues: a hashtable of queues (struct vfio_ap_queue).
89 struct ap_queue_table {
90 DECLARE_HASHTABLE(queues, 8);
94 * struct ap_matrix_mdev - Contains the data associated with a matrix mediated
96 * @vdev: the vfio device
97 * @node: allows the ap_matrix_mdev struct to be added to a list
98 * @matrix: the adapters, usage domains and control domains assigned to the
99 * mediated matrix device.
100 * @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB
101 * @kvm: the struct holding guest's state
102 * @pqap_hook: the function pointer to the interception handler for the
103 * PQAP(AQIC) instruction.
104 * @mdev: the mediated device
105 * @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
106 * @apm_add: bitmap of APIDs added to the host's AP configuration
107 * @aqm_add: bitmap of APQIs added to the host's AP configuration
108 * @adm_add: bitmap of control domain numbers added to the host's AP
111 struct ap_matrix_mdev {
112 struct vfio_device vdev;
113 struct list_head node;
114 struct ap_matrix matrix;
115 struct ap_matrix shadow_apcb;
117 crypto_hook pqap_hook;
118 struct mdev_device *mdev;
119 struct ap_queue_table qtable;
120 DECLARE_BITMAP(apm_add, AP_DEVICES);
121 DECLARE_BITMAP(aqm_add, AP_DOMAINS);
122 DECLARE_BITMAP(adm_add, AP_DOMAINS);
126 * struct vfio_ap_queue - contains the data associated with a queue bound to the
127 * vfio_ap device driver
128 * @matrix_mdev: the matrix mediated device
129 * @saved_iova: the notification indicator byte (nib) address
130 * @apqn: the APQN of the AP queue device
131 * @saved_isc: the guest ISC registered with the GIB interface
132 * @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable
133 * @reset_rc: the status response code from the last reset of the queue
135 struct vfio_ap_queue {
136 struct ap_matrix_mdev *matrix_mdev;
137 dma_addr_t saved_iova;
139 #define VFIO_AP_ISC_INVALID 0xff
140 unsigned char saved_isc;
141 struct hlist_node mdev_qnode;
142 unsigned int reset_rc;
145 int vfio_ap_mdev_register(void);
146 void vfio_ap_mdev_unregister(void);
148 int vfio_ap_mdev_probe_queue(struct ap_device *queue);
149 void vfio_ap_mdev_remove_queue(struct ap_device *queue);
151 int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
153 void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
154 struct ap_config_info *old_config_info);
155 void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
156 struct ap_config_info *old_config_info);
158 #endif /* _VFIO_AP_PRIVATE_H_ */