1 /*
2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/mlx5/driver.h>
34 #include "mlx5_core.h"
35
36 static LIST_HEAD(intf_list);
37 static LIST_HEAD(mlx5_dev_list);
38 /* intf dev list mutex */
39 static DEFINE_MUTEX(mlx5_intf_mutex);
40
41 struct mlx5_device_context {
42 struct list_head list;
43 struct mlx5_interface *intf;
44 void *context;
45 unsigned long state;
46 };
47
48 enum {
49 MLX5_INTERFACE_ADDED,
50 MLX5_INTERFACE_ATTACHED,
51 };
52
53
mlx5_add_device(struct mlx5_interface * intf,struct mlx5_priv * priv)54 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
55 {
56 struct mlx5_device_context *dev_ctx;
57 struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
58
59 if (!mlx5_lag_intf_add(intf, priv))
60 return;
61
62 dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
63 if (!dev_ctx)
64 return;
65
66 dev_ctx->intf = intf;
67
68 dev_ctx->context = intf->add(dev);
69 if (dev_ctx->context) {
70 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
71 if (intf->attach)
72 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
73
74 spin_lock_irq(&priv->ctx_lock);
75 list_add_tail(&dev_ctx->list, &priv->ctx_list);
76 spin_unlock_irq(&priv->ctx_lock);
77 }
78
79 if (!dev_ctx->context)
80 kfree(dev_ctx);
81 }
82
mlx5_get_device(struct mlx5_interface * intf,struct mlx5_priv * priv)83 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
84 struct mlx5_priv *priv)
85 {
86 struct mlx5_device_context *dev_ctx;
87
88 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
89 if (dev_ctx->intf == intf)
90 return dev_ctx;
91 return NULL;
92 }
93
mlx5_remove_device(struct mlx5_interface * intf,struct mlx5_priv * priv)94 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
95 {
96 struct mlx5_device_context *dev_ctx;
97 struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
98
99 dev_ctx = mlx5_get_device(intf, priv);
100 if (!dev_ctx)
101 return;
102
103 spin_lock_irq(&priv->ctx_lock);
104 list_del(&dev_ctx->list);
105 spin_unlock_irq(&priv->ctx_lock);
106
107 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
108 intf->remove(dev, dev_ctx->context);
109
110 kfree(dev_ctx);
111 }
112
mlx5_attach_interface(struct mlx5_interface * intf,struct mlx5_priv * priv)113 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
114 {
115 struct mlx5_device_context *dev_ctx;
116 struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
117
118 dev_ctx = mlx5_get_device(intf, priv);
119 if (!dev_ctx)
120 return;
121
122 if (intf->attach) {
123 if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
124 return;
125 if (intf->attach(dev, dev_ctx->context))
126 return;
127 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
128 } else {
129 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
130 return;
131 dev_ctx->context = intf->add(dev);
132 if (!dev_ctx->context)
133 return;
134 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
135 }
136 }
137
mlx5_attach_device(struct mlx5_core_dev * dev)138 void mlx5_attach_device(struct mlx5_core_dev *dev)
139 {
140 struct mlx5_priv *priv = &dev->priv;
141 struct mlx5_interface *intf;
142
143 mutex_lock(&mlx5_intf_mutex);
144 list_for_each_entry(intf, &intf_list, list)
145 mlx5_attach_interface(intf, priv);
146 mutex_unlock(&mlx5_intf_mutex);
147 }
148
mlx5_detach_interface(struct mlx5_interface * intf,struct mlx5_priv * priv)149 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
150 {
151 struct mlx5_device_context *dev_ctx;
152 struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
153
154 dev_ctx = mlx5_get_device(intf, priv);
155 if (!dev_ctx)
156 return;
157
158 if (intf->detach) {
159 if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
160 return;
161 intf->detach(dev, dev_ctx->context);
162 clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
163 } else {
164 if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
165 return;
166 intf->remove(dev, dev_ctx->context);
167 clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
168 }
169 }
170
mlx5_detach_device(struct mlx5_core_dev * dev)171 void mlx5_detach_device(struct mlx5_core_dev *dev)
172 {
173 struct mlx5_priv *priv = &dev->priv;
174 struct mlx5_interface *intf;
175
176 mutex_lock(&mlx5_intf_mutex);
177 list_for_each_entry(intf, &intf_list, list)
178 mlx5_detach_interface(intf, priv);
179 mutex_unlock(&mlx5_intf_mutex);
180 }
181
mlx5_device_registered(struct mlx5_core_dev * dev)182 bool mlx5_device_registered(struct mlx5_core_dev *dev)
183 {
184 struct mlx5_priv *priv;
185 bool found = false;
186
187 mutex_lock(&mlx5_intf_mutex);
188 list_for_each_entry(priv, &mlx5_dev_list, dev_list)
189 if (priv == &dev->priv)
190 found = true;
191 mutex_unlock(&mlx5_intf_mutex);
192
193 return found;
194 }
195
mlx5_register_device(struct mlx5_core_dev * dev)196 int mlx5_register_device(struct mlx5_core_dev *dev)
197 {
198 struct mlx5_priv *priv = &dev->priv;
199 struct mlx5_interface *intf;
200
201 mutex_lock(&mlx5_intf_mutex);
202 list_add_tail(&priv->dev_list, &mlx5_dev_list);
203 list_for_each_entry(intf, &intf_list, list)
204 mlx5_add_device(intf, priv);
205 mutex_unlock(&mlx5_intf_mutex);
206
207 return 0;
208 }
209
mlx5_unregister_device(struct mlx5_core_dev * dev)210 void mlx5_unregister_device(struct mlx5_core_dev *dev)
211 {
212 struct mlx5_priv *priv = &dev->priv;
213 struct mlx5_interface *intf;
214
215 mutex_lock(&mlx5_intf_mutex);
216 list_for_each_entry_reverse(intf, &intf_list, list)
217 mlx5_remove_device(intf, priv);
218 list_del(&priv->dev_list);
219 mutex_unlock(&mlx5_intf_mutex);
220 }
221
mlx5_register_interface(struct mlx5_interface * intf)222 int mlx5_register_interface(struct mlx5_interface *intf)
223 {
224 struct mlx5_priv *priv;
225
226 if (!intf->add || !intf->remove)
227 return -EINVAL;
228
229 mutex_lock(&mlx5_intf_mutex);
230 list_add_tail(&intf->list, &intf_list);
231 list_for_each_entry(priv, &mlx5_dev_list, dev_list)
232 mlx5_add_device(intf, priv);
233 mutex_unlock(&mlx5_intf_mutex);
234
235 return 0;
236 }
237 EXPORT_SYMBOL(mlx5_register_interface);
238
mlx5_unregister_interface(struct mlx5_interface * intf)239 void mlx5_unregister_interface(struct mlx5_interface *intf)
240 {
241 struct mlx5_priv *priv;
242
243 mutex_lock(&mlx5_intf_mutex);
244 list_for_each_entry(priv, &mlx5_dev_list, dev_list)
245 mlx5_remove_device(intf, priv);
246 list_del(&intf->list);
247 mutex_unlock(&mlx5_intf_mutex);
248 }
249 EXPORT_SYMBOL(mlx5_unregister_interface);
250
251 /* Must be called with intf_mutex held */
mlx5_has_added_dev_by_protocol(struct mlx5_core_dev * mdev,int protocol)252 static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
253 {
254 struct mlx5_device_context *dev_ctx;
255 struct mlx5_interface *intf;
256 bool found = false;
257
258 list_for_each_entry(intf, &intf_list, list) {
259 if (intf->protocol == protocol) {
260 dev_ctx = mlx5_get_device(intf, &mdev->priv);
261 if (dev_ctx && test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
262 found = true;
263 break;
264 }
265 }
266
267 return found;
268 }
269
mlx5_reload_interface(struct mlx5_core_dev * mdev,int protocol)270 void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
271 {
272 mutex_lock(&mlx5_intf_mutex);
273 if (mlx5_has_added_dev_by_protocol(mdev, protocol)) {
274 mlx5_remove_dev_by_protocol(mdev, protocol);
275 mlx5_add_dev_by_protocol(mdev, protocol);
276 }
277 mutex_unlock(&mlx5_intf_mutex);
278 }
279
280 /* Must be called with intf_mutex held */
mlx5_add_dev_by_protocol(struct mlx5_core_dev * dev,int protocol)281 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
282 {
283 struct mlx5_interface *intf;
284
285 list_for_each_entry(intf, &intf_list, list)
286 if (intf->protocol == protocol) {
287 mlx5_add_device(intf, &dev->priv);
288 break;
289 }
290 }
291
292 /* Must be called with intf_mutex held */
mlx5_remove_dev_by_protocol(struct mlx5_core_dev * dev,int protocol)293 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
294 {
295 struct mlx5_interface *intf;
296
297 list_for_each_entry(intf, &intf_list, list)
298 if (intf->protocol == protocol) {
299 mlx5_remove_device(intf, &dev->priv);
300 break;
301 }
302 }
303
mlx5_gen_pci_id(struct mlx5_core_dev * dev)304 static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
305 {
306 return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
307 (dev->pdev->bus->number << 8) |
308 PCI_SLOT(dev->pdev->devfn));
309 }
310
311 /* Must be called with intf_mutex held */
mlx5_get_next_phys_dev(struct mlx5_core_dev * dev)312 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
313 {
314 struct mlx5_core_dev *res = NULL;
315 struct mlx5_core_dev *tmp_dev;
316 struct mlx5_priv *priv;
317 u32 pci_id;
318
319 if (!mlx5_core_is_pf(dev))
320 return NULL;
321
322 pci_id = mlx5_gen_pci_id(dev);
323 list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
324 tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
325 if (!mlx5_core_is_pf(tmp_dev))
326 continue;
327
328 if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
329 res = tmp_dev;
330 break;
331 }
332 }
333
334 return res;
335 }
336
337
mlx5_dev_list_lock(void)338 void mlx5_dev_list_lock(void)
339 {
340 mutex_lock(&mlx5_intf_mutex);
341 }
342
mlx5_dev_list_unlock(void)343 void mlx5_dev_list_unlock(void)
344 {
345 mutex_unlock(&mlx5_intf_mutex);
346 }
347
mlx5_dev_list_trylock(void)348 int mlx5_dev_list_trylock(void)
349 {
350 return mutex_trylock(&mlx5_intf_mutex);
351 }
352
