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/device.h>
17 #include <linux/mdev.h>
18 #include <linux/delay.h>
19 #include <linux/mutex.h>
20 #include <linux/kvm_host.h>
21
22 #include "ap_bus.h"
23
24 #define VFIO_AP_MODULE_NAME "vfio_ap"
25 #define VFIO_AP_DRV_NAME "vfio_ap"
26
27 /**
28 * ap_matrix_dev - the AP matrix device structure
29 * @device: generic device structure associated with the AP matrix device
30 * @available_instances: number of mediated matrix devices that can be created
31 * @info: the struct containing the output from the PQAP(QCI) instruction
32 * mdev_list: the list of mediated matrix devices created
33 * lock: mutex for locking the AP matrix device. This lock will be
34 * taken every time we fiddle with state managed by the vfio_ap
35 * driver, be it using @mdev_list or writing the state of a
36 * single ap_matrix_mdev device. It's quite coarse but we don't
37 * expect much contention.
38 */
39 struct ap_matrix_dev {
40 struct device device;
41 atomic_t available_instances;
42 struct ap_config_info info;
43 struct list_head mdev_list;
44 struct mutex lock;
45 struct ap_driver *vfio_ap_drv;
46 };
47
48 extern struct ap_matrix_dev *matrix_dev;
49
50 /**
51 * The AP matrix is comprised of three bit masks identifying the adapters,
52 * queues (domains) and control domains that belong to an AP matrix. The bits i
53 * each mask, from least significant to most significant bit, correspond to IDs
54 * 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
55 *
56 * @apm_max: max adapter number in @apm
57 * @apm identifies the AP adapters in the matrix
58 * @aqm_max: max domain number in @aqm
59 * @aqm identifies the AP queues (domains) in the matrix
60 * @adm_max: max domain number in @adm
61 * @adm identifies the AP control domains in the matrix
62 */
63 struct ap_matrix {
64 unsigned long apm_max;
65 DECLARE_BITMAP(apm, 256);
66 unsigned long aqm_max;
67 DECLARE_BITMAP(aqm, 256);
68 unsigned long adm_max;
69 DECLARE_BITMAP(adm, 256);
70 };
71
72 /**
73 * struct ap_matrix_mdev - the mediated matrix device structure
74 * @list: allows the ap_matrix_mdev struct to be added to a list
75 * @matrix: the adapters, usage domains and control domains assigned to the
76 * mediated matrix device.
77 * @group_notifier: notifier block used for specifying callback function for
78 * handling the VFIO_GROUP_NOTIFY_SET_KVM event
79 * @kvm: the struct holding guest's state
80 */
81 struct ap_matrix_mdev {
82 struct list_head node;
83 struct ap_matrix matrix;
84 struct notifier_block group_notifier;
85 struct notifier_block iommu_notifier;
86 struct kvm *kvm;
87 struct kvm_s390_module_hook pqap_hook;
88 struct mdev_device *mdev;
89 };
90
91 extern int vfio_ap_mdev_register(void);
92 extern void vfio_ap_mdev_unregister(void);
93 int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
94 unsigned int retry);
95
96 struct vfio_ap_queue {
97 struct ap_matrix_mdev *matrix_mdev;
98 unsigned long saved_pfn;
99 int apqn;
100 #define VFIO_AP_ISC_INVALID 0xff
101 unsigned char saved_isc;
102 };
103 struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q);
104 #endif /* _VFIO_AP_PRIVATE_H_ */