1 // SPDX-License-Identifier: GPL-2.0+
3 * VFIO based AP device driver
5 * Copyright IBM Corp. 2018
7 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
8 * Pierre Morel <pmorel@linux.ibm.com>
11 #include <linux/module.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <asm/facility.h>
16 #include "vfio_ap_private.h"
18 #define VFIO_AP_ROOT_NAME "vfio_ap"
19 #define VFIO_AP_DEV_NAME "matrix"
21 MODULE_AUTHOR("IBM Corporation");
22 MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
23 MODULE_LICENSE("GPL v2");
25 static struct ap_driver vfio_ap_drv;
27 struct ap_matrix_dev *matrix_dev;
29 /* Only type 10 adapters (CEX4 and later) are supported
30 * by the AP matrix device driver
32 static struct ap_device_id ap_queue_ids[] = {
33 { .dev_type = AP_DEVICE_TYPE_CEX4,
34 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
35 { .dev_type = AP_DEVICE_TYPE_CEX5,
36 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
37 { .dev_type = AP_DEVICE_TYPE_CEX6,
38 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
39 { .dev_type = AP_DEVICE_TYPE_CEX7,
40 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
41 { /* end of sibling */ },
44 MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
47 * vfio_ap_queue_dev_probe:
49 * Allocate a vfio_ap_queue structure and associate it
50 * with the device as driver_data.
52 static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
54 struct vfio_ap_queue *q;
56 q = kzalloc(sizeof(*q), GFP_KERNEL);
59 dev_set_drvdata(&apdev->device, q);
60 q->apqn = to_ap_queue(&apdev->device)->qid;
61 q->saved_isc = VFIO_AP_ISC_INVALID;
66 * vfio_ap_queue_dev_remove:
68 * Takes the matrix lock to avoid actions on this device while removing
69 * Free the associated vfio_ap_queue structure
71 static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
73 struct vfio_ap_queue *q;
75 mutex_lock(&matrix_dev->lock);
76 q = dev_get_drvdata(&apdev->device);
77 vfio_ap_mdev_reset_queue(q, 1);
78 dev_set_drvdata(&apdev->device, NULL);
80 mutex_unlock(&matrix_dev->lock);
83 static void vfio_ap_matrix_dev_release(struct device *dev)
85 struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
90 static int matrix_bus_match(struct device *dev, struct device_driver *drv)
95 static struct bus_type matrix_bus = {
97 .match = &matrix_bus_match,
100 static struct device_driver matrix_driver = {
103 .suppress_bind_attrs = true,
106 static int vfio_ap_matrix_dev_create(void)
109 struct device *root_device;
111 root_device = root_device_register(VFIO_AP_ROOT_NAME);
112 if (IS_ERR(root_device))
113 return PTR_ERR(root_device);
115 ret = bus_register(&matrix_bus);
117 goto bus_register_err;
119 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
122 goto matrix_alloc_err;
125 /* Fill in config info via PQAP(QCI), if available */
126 if (test_facility(12)) {
127 ret = ap_qci(&matrix_dev->info);
129 goto matrix_alloc_err;
132 mutex_init(&matrix_dev->lock);
133 INIT_LIST_HEAD(&matrix_dev->mdev_list);
135 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
136 matrix_dev->device.parent = root_device;
137 matrix_dev->device.bus = &matrix_bus;
138 matrix_dev->device.release = vfio_ap_matrix_dev_release;
139 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
141 ret = device_register(&matrix_dev->device);
145 ret = driver_register(&matrix_driver);
152 device_unregister(&matrix_dev->device);
154 put_device(&matrix_dev->device);
156 bus_unregister(&matrix_bus);
158 root_device_unregister(root_device);
162 static void vfio_ap_matrix_dev_destroy(void)
164 struct device *root_device = matrix_dev->device.parent;
166 driver_unregister(&matrix_driver);
167 device_unregister(&matrix_dev->device);
168 bus_unregister(&matrix_bus);
169 root_device_unregister(root_device);
172 static int __init vfio_ap_init(void)
176 /* If there are no AP instructions, there is nothing to pass through. */
177 if (!ap_instructions_available())
180 ret = vfio_ap_matrix_dev_create();
184 memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv));
185 vfio_ap_drv.probe = vfio_ap_queue_dev_probe;
186 vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
187 vfio_ap_drv.ids = ap_queue_ids;
189 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
191 vfio_ap_matrix_dev_destroy();
195 ret = vfio_ap_mdev_register();
197 ap_driver_unregister(&vfio_ap_drv);
198 vfio_ap_matrix_dev_destroy();
206 static void __exit vfio_ap_exit(void)
208 vfio_ap_mdev_unregister();
209 ap_driver_unregister(&vfio_ap_drv);
210 vfio_ap_matrix_dev_destroy();
213 module_init(vfio_ap_init);
214 module_exit(vfio_ap_exit);