1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * VFIO based AP device driver
4 *
5 * Copyright IBM Corp. 2018
6 *
7 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
8 *	      Pierre Morel <pmorel@linux.ibm.com>
9 */
10
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"
18
19#define VFIO_AP_ROOT_NAME "vfio_ap"
20#define VFIO_AP_DEV_NAME "matrix"
21
22MODULE_AUTHOR("IBM Corporation");
23MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
24MODULE_LICENSE("GPL v2");
25
26struct ap_matrix_dev *matrix_dev;
27debug_info_t *vfio_ap_dbf_info;
28
29/* Only type 10 adapters (CEX4 and later) are supported
30 * by the AP matrix device driver
31 */
32static 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 */ },
44};
45
46static 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,
52	.ids = ap_queue_ids,
53};
54
55static void vfio_ap_matrix_dev_release(struct device *dev)
56{
57	struct ap_matrix_dev *matrix_dev;
58
59	matrix_dev = container_of(dev, struct ap_matrix_dev, device);
60	kfree(matrix_dev);
61}
62
63static struct bus_type matrix_bus = {
64	.name = "matrix",
65};
66
67static struct device_driver matrix_driver = {
68	.name = "vfio_ap",
69	.bus = &matrix_bus,
70	.suppress_bind_attrs = true,
71};
72
73static int vfio_ap_matrix_dev_create(void)
74{
75	int ret;
76	struct device *root_device;
77
78	root_device = root_device_register(VFIO_AP_ROOT_NAME);
79	if (IS_ERR(root_device))
80		return PTR_ERR(root_device);
81
82	ret = bus_register(&matrix_bus);
83	if (ret)
84		goto bus_register_err;
85
86	matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
87	if (!matrix_dev) {
88		ret = -ENOMEM;
89		goto matrix_alloc_err;
90	}
91
92	/* Fill in config info via PQAP(QCI), if available */
93	if (test_facility(12)) {
94		ret = ap_qci(&matrix_dev->info);
95		if (ret)
96			goto matrix_alloc_err;
97	}
98
99	mutex_init(&matrix_dev->mdevs_lock);
100	INIT_LIST_HEAD(&matrix_dev->mdev_list);
101	mutex_init(&matrix_dev->guests_lock);
102
103	dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
104	matrix_dev->device.parent = root_device;
105	matrix_dev->device.bus = &matrix_bus;
106	matrix_dev->device.release = vfio_ap_matrix_dev_release;
107	matrix_dev->vfio_ap_drv = &vfio_ap_drv;
108
109	ret = device_register(&matrix_dev->device);
110	if (ret)
111		goto matrix_reg_err;
112
113	ret = driver_register(&matrix_driver);
114	if (ret)
115		goto matrix_drv_err;
116
117	return 0;
118
119matrix_drv_err:
120	device_del(&matrix_dev->device);
121matrix_reg_err:
122	put_device(&matrix_dev->device);
123matrix_alloc_err:
124	bus_unregister(&matrix_bus);
125bus_register_err:
126	root_device_unregister(root_device);
127	return ret;
128}
129
130static void vfio_ap_matrix_dev_destroy(void)
131{
132	struct device *root_device = matrix_dev->device.parent;
133
134	driver_unregister(&matrix_driver);
135	device_unregister(&matrix_dev->device);
136	bus_unregister(&matrix_bus);
137	root_device_unregister(root_device);
138}
139
140static int __init vfio_ap_dbf_info_init(void)
141{
142	vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
143					  DBF_MAX_SPRINTF_ARGS * sizeof(long));
144
145	if (!vfio_ap_dbf_info)
146		return -ENOENT;
147
148	debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
149	debug_set_level(vfio_ap_dbf_info, DBF_WARN);
150
151	return 0;
152}
153
154static int __init vfio_ap_init(void)
155{
156	int ret;
157
158	ret = vfio_ap_dbf_info_init();
159	if (ret)
160		return ret;
161
162	/* If there are no AP instructions, there is nothing to pass through. */
163	if (!ap_instructions_available())
164		return -ENODEV;
165
166	ret = vfio_ap_matrix_dev_create();
167	if (ret)
168		return ret;
169
170	ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
171	if (ret) {
172		vfio_ap_matrix_dev_destroy();
173		return ret;
174	}
175
176	ret = vfio_ap_mdev_register();
177	if (ret) {
178		ap_driver_unregister(&vfio_ap_drv);
179		vfio_ap_matrix_dev_destroy();
180
181		return ret;
182	}
183
184	return 0;
185}
186
187static void __exit vfio_ap_exit(void)
188{
189	vfio_ap_mdev_unregister();
190	ap_driver_unregister(&vfio_ap_drv);
191	vfio_ap_matrix_dev_destroy();
192	debug_unregister(vfio_ap_dbf_info);
193}
194
195module_init(vfio_ap_init);
196module_exit(vfio_ap_exit);
197