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);