tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
4 *
5 * GPL LICENSE SUMMARY
6 *
7 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 *
26 * * Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * * Redistributions in binary form must reproduce the above copy
29 * notice, this list of conditions and the following disclaimer in
30 * the documentation and/or other materials provided with the
31 * distribution.
32 * * Neither the name of Intel Corporation nor the names of its
33 * contributors may be used to endorse or promote products derived
34 * from this software without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
37 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
38 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
39 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
40 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
43 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
44 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
45 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
46 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 *
48 * PCIe NTB Linux driver
49 *
50 * Contact Information:
51 * Allen Hubbe <Allen.Hubbe@emc.com>
52 */
53
54#include <linux/device.h>
55#include <linux/kernel.h>
56#include <linux/module.h>
57
58#include <linux/ntb.h>
59#include <linux/pci.h>
60
61#define DRIVER_NAME "ntb"
62#define DRIVER_DESCRIPTION "PCIe NTB Driver Framework"
63
64#define DRIVER_LICENSE "Dual BSD/GPL"
65#define DRIVER_VERSION "1.0"
66#define DRIVER_RELDATE "24 March 2015"
67#define DRIVER_AUTHOR "Allen Hubbe <Allen.Hubbe@emc.com>"
68
69MODULE_LICENSE(DRIVER_LICENSE);
70MODULE_VERSION(DRIVER_VERSION);
71MODULE_AUTHOR(DRIVER_AUTHOR);
72MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
73
74static struct bus_type ntb_bus;
75static void ntb_dev_release(struct device *dev);
76
77int __ntb_register_client(struct ntb_client *client, struct module *mod,
78 const char *mod_name)
79{
80 if (!client)
81 return -EINVAL;
82 if (!ntb_client_ops_is_valid(&client->ops))
83 return -EINVAL;
84
85 memset(&client->drv, 0, sizeof(client->drv));
86 client->drv.bus = &ntb_bus;
87 client->drv.name = mod_name;
88 client->drv.owner = mod;
89
90 return driver_register(&client->drv);
91}
92EXPORT_SYMBOL(__ntb_register_client);
93
94void ntb_unregister_client(struct ntb_client *client)
95{
96 driver_unregister(&client->drv);
97}
98EXPORT_SYMBOL(ntb_unregister_client);
99
100int ntb_register_device(struct ntb_dev *ntb)
101{
102 if (!ntb)
103 return -EINVAL;
104 if (!ntb->pdev)
105 return -EINVAL;
106 if (!ntb->ops)
107 return -EINVAL;
108 if (!ntb_dev_ops_is_valid(ntb->ops))
109 return -EINVAL;
110
111 init_completion(&ntb->released);
112
113 memset(&ntb->dev, 0, sizeof(ntb->dev));
114 ntb->dev.bus = &ntb_bus;
115 ntb->dev.parent = &ntb->pdev->dev;
116 ntb->dev.release = ntb_dev_release;
117 dev_set_name(&ntb->dev, "%s", pci_name(ntb->pdev));
118
119 ntb->ctx = NULL;
120 ntb->ctx_ops = NULL;
121 spin_lock_init(&ntb->ctx_lock);
122
123 return device_register(&ntb->dev);
124}
125EXPORT_SYMBOL(ntb_register_device);
126
127void ntb_unregister_device(struct ntb_dev *ntb)
128{
129 device_unregister(&ntb->dev);
130 wait_for_completion(&ntb->released);
131}
132EXPORT_SYMBOL(ntb_unregister_device);
133
134int ntb_set_ctx(struct ntb_dev *ntb, void *ctx,
135 const struct ntb_ctx_ops *ctx_ops)
136{
137 unsigned long irqflags;
138
139 if (!ntb_ctx_ops_is_valid(ctx_ops))
140 return -EINVAL;
141 if (ntb->ctx_ops)
142 return -EINVAL;
143
144 spin_lock_irqsave(&ntb->ctx_lock, irqflags);
145 {
146 ntb->ctx = ctx;
147 ntb->ctx_ops = ctx_ops;
148 }
149 spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
150
151 return 0;
152}
153EXPORT_SYMBOL(ntb_set_ctx);
154
155void ntb_clear_ctx(struct ntb_dev *ntb)
156{
157 unsigned long irqflags;
158
159 spin_lock_irqsave(&ntb->ctx_lock, irqflags);
160 {
161 ntb->ctx_ops = NULL;
162 ntb->ctx = NULL;
163 }
164 spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
165}
166EXPORT_SYMBOL(ntb_clear_ctx);
167
168void ntb_link_event(struct ntb_dev *ntb)
169{
170 unsigned long irqflags;
171
172 spin_lock_irqsave(&ntb->ctx_lock, irqflags);
173 {
174 if (ntb->ctx_ops && ntb->ctx_ops->link_event)
175 ntb->ctx_ops->link_event(ntb->ctx);
176 }
177 spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
178}
179EXPORT_SYMBOL(ntb_link_event);
180
181void ntb_db_event(struct ntb_dev *ntb, int vector)
182{
183 unsigned long irqflags;
184
185 spin_lock_irqsave(&ntb->ctx_lock, irqflags);
186 {
187 if (ntb->ctx_ops && ntb->ctx_ops->db_event)
188 ntb->ctx_ops->db_event(ntb->ctx, vector);
189 }
190 spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
191}
192EXPORT_SYMBOL(ntb_db_event);
193
194static int ntb_probe(struct device *dev)
195{
196 struct ntb_dev *ntb;
197 struct ntb_client *client;
198 int rc;
199
200 get_device(dev);
201 ntb = dev_ntb(dev);
202 client = drv_ntb_client(dev->driver);
203
204 rc = client->ops.probe(client, ntb);
205 if (rc)
206 put_device(dev);
207
208 return rc;
209}
210
211static int ntb_remove(struct device *dev)
212{
213 struct ntb_dev *ntb;
214 struct ntb_client *client;
215
216 if (dev->driver) {
217 ntb = dev_ntb(dev);
218 client = drv_ntb_client(dev->driver);
219
220 client->ops.remove(client, ntb);
221 put_device(dev);
222 }
223
224 return 0;
225}
226
227static void ntb_dev_release(struct device *dev)
228{
229 struct ntb_dev *ntb = dev_ntb(dev);
230
231 complete(&ntb->released);
232}
233
234static struct bus_type ntb_bus = {
235 .name = "ntb",
236 .probe = ntb_probe,
237 .remove = ntb_remove,
238};
239
240static int __init ntb_driver_init(void)
241{
242 return bus_register(&ntb_bus);
243}
244module_init(ntb_driver_init);
245
246static void __exit ntb_driver_exit(void)
247{
248 bus_unregister(&ntb_bus);
249}
250module_exit(ntb_driver_exit);
251