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"
17 #include "vfio_ap_debug.h"
19 #define VFIO_AP_ROOT_NAME "vfio_ap"
20 #define VFIO_AP_DEV_NAME "matrix"
22 MODULE_AUTHOR("IBM Corporation");
23 MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
24 MODULE_LICENSE("GPL v2");
26 struct ap_matrix_dev *matrix_dev;
27 debug_info_t *vfio_ap_dbf_info;
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 { .dev_type = AP_DEVICE_TYPE_CEX8,
42 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
43 { /* end of sibling */ },
46 static struct ap_driver vfio_ap_drv = {
47 .probe = vfio_ap_mdev_probe_queue,
48 .remove = vfio_ap_mdev_remove_queue,
49 .in_use = vfio_ap_mdev_resource_in_use,
50 .on_config_changed = vfio_ap_on_cfg_changed,
51 .on_scan_complete = vfio_ap_on_scan_complete,
55 static void vfio_ap_matrix_dev_release(struct device *dev)
57 struct ap_matrix_dev *matrix_dev;
59 matrix_dev = container_of(dev, struct ap_matrix_dev, device);
63 static int matrix_bus_match(struct device *dev, struct device_driver *drv)
68 static struct bus_type matrix_bus = {
70 .match = &matrix_bus_match,
73 static struct device_driver matrix_driver = {
76 .suppress_bind_attrs = true,
79 static int vfio_ap_matrix_dev_create(void)
82 struct device *root_device;
84 root_device = root_device_register(VFIO_AP_ROOT_NAME);
85 if (IS_ERR(root_device))
86 return PTR_ERR(root_device);
88 ret = bus_register(&matrix_bus);
90 goto bus_register_err;
92 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
95 goto matrix_alloc_err;
98 /* Fill in config info via PQAP(QCI), if available */
99 if (test_facility(12)) {
100 ret = ap_qci(&matrix_dev->info);
102 goto matrix_alloc_err;
105 mutex_init(&matrix_dev->mdevs_lock);
106 INIT_LIST_HEAD(&matrix_dev->mdev_list);
107 mutex_init(&matrix_dev->guests_lock);
109 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
110 matrix_dev->device.parent = root_device;
111 matrix_dev->device.bus = &matrix_bus;
112 matrix_dev->device.release = vfio_ap_matrix_dev_release;
113 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
115 ret = device_register(&matrix_dev->device);
119 ret = driver_register(&matrix_driver);
126 device_del(&matrix_dev->device);
128 put_device(&matrix_dev->device);
130 bus_unregister(&matrix_bus);
132 root_device_unregister(root_device);
136 static void vfio_ap_matrix_dev_destroy(void)
138 struct device *root_device = matrix_dev->device.parent;
140 driver_unregister(&matrix_driver);
141 device_unregister(&matrix_dev->device);
142 bus_unregister(&matrix_bus);
143 root_device_unregister(root_device);
146 static int __init vfio_ap_dbf_info_init(void)
148 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
149 DBF_MAX_SPRINTF_ARGS * sizeof(long));
151 if (!vfio_ap_dbf_info)
154 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
155 debug_set_level(vfio_ap_dbf_info, DBF_WARN);
160 static int __init vfio_ap_init(void)
164 ret = vfio_ap_dbf_info_init();
168 /* If there are no AP instructions, there is nothing to pass through. */
169 if (!ap_instructions_available())
172 ret = vfio_ap_matrix_dev_create();
176 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
178 vfio_ap_matrix_dev_destroy();
182 ret = vfio_ap_mdev_register();
184 ap_driver_unregister(&vfio_ap_drv);
185 vfio_ap_matrix_dev_destroy();
193 static void __exit vfio_ap_exit(void)
195 vfio_ap_mdev_unregister();
196 ap_driver_unregister(&vfio_ap_drv);
197 vfio_ap_matrix_dev_destroy();
198 debug_unregister(vfio_ap_dbf_info);
201 module_init(vfio_ap_init);
202 module_exit(vfio_ap_exit);