1
2
3
4#include <linux/mlx5/vport.h>
5#include "lib/devcom.h"
6
7static LIST_HEAD(devcom_list);
8
9#define devcom_for_each_component(priv, comp, iter) \
10 for (iter = 0; \
11 comp = &(priv)->components[iter], iter < MLX5_DEVCOM_NUM_COMPONENTS; \
12 iter++)
13
14struct mlx5_devcom_component {
15 struct {
16 void *data;
17 } device[MLX5_MAX_PORTS];
18
19 mlx5_devcom_event_handler_t handler;
20 struct rw_semaphore sem;
21 bool paired;
22};
23
24struct mlx5_devcom_list {
25 struct list_head list;
26
27 struct mlx5_devcom_component components[MLX5_DEVCOM_NUM_COMPONENTS];
28 struct mlx5_core_dev *devs[MLX5_MAX_PORTS];
29};
30
31struct mlx5_devcom {
32 struct mlx5_devcom_list *priv;
33 int idx;
34};
35
36static struct mlx5_devcom_list *mlx5_devcom_list_alloc(void)
37{
38 struct mlx5_devcom_component *comp;
39 struct mlx5_devcom_list *priv;
40 int i;
41
42 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
43 if (!priv)
44 return NULL;
45
46 devcom_for_each_component(priv, comp, i)
47 init_rwsem(&comp->sem);
48
49 return priv;
50}
51
52static struct mlx5_devcom *mlx5_devcom_alloc(struct mlx5_devcom_list *priv,
53 u8 idx)
54{
55 struct mlx5_devcom *devcom;
56
57 devcom = kzalloc(sizeof(*devcom), GFP_KERNEL);
58 if (!devcom)
59 return NULL;
60
61 devcom->priv = priv;
62 devcom->idx = idx;
63 return devcom;
64}
65
66
67struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
68{
69 struct mlx5_devcom_list *priv = NULL, *iter;
70 struct mlx5_devcom *devcom = NULL;
71 bool new_priv = false;
72 u64 sguid0, sguid1;
73 int idx, i;
74
75 if (!mlx5_core_is_pf(dev))
76 return NULL;
77
78 sguid0 = mlx5_query_nic_system_image_guid(dev);
79 list_for_each_entry(iter, &devcom_list, list) {
80 struct mlx5_core_dev *tmp_dev = NULL;
81
82 idx = -1;
83 for (i = 0; i < MLX5_MAX_PORTS; i++) {
84 if (iter->devs[i])
85 tmp_dev = iter->devs[i];
86 else
87 idx = i;
88 }
89
90 if (idx == -1)
91 continue;
92
93 sguid1 = mlx5_query_nic_system_image_guid(tmp_dev);
94 if (sguid0 != sguid1)
95 continue;
96
97 priv = iter;
98 break;
99 }
100
101 if (!priv) {
102 priv = mlx5_devcom_list_alloc();
103 if (!priv)
104 return ERR_PTR(-ENOMEM);
105
106 idx = 0;
107 new_priv = true;
108 }
109
110 priv->devs[idx] = dev;
111 devcom = mlx5_devcom_alloc(priv, idx);
112 if (!devcom) {
113 kfree(priv);
114 return ERR_PTR(-ENOMEM);
115 }
116
117 if (new_priv)
118 list_add(&priv->list, &devcom_list);
119
120 return devcom;
121}
122
123
124void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom)
125{
126 struct mlx5_devcom_list *priv;
127 int i;
128
129 if (IS_ERR_OR_NULL(devcom))
130 return;
131
132 priv = devcom->priv;
133 priv->devs[devcom->idx] = NULL;
134
135 kfree(devcom);
136
137 for (i = 0; i < MLX5_MAX_PORTS; i++)
138 if (priv->devs[i])
139 break;
140
141 if (i != MLX5_MAX_PORTS)
142 return;
143
144 list_del(&priv->list);
145 kfree(priv);
146}
147
148void mlx5_devcom_register_component(struct mlx5_devcom *devcom,
149 enum mlx5_devcom_components id,
150 mlx5_devcom_event_handler_t handler,
151 void *data)
152{
153 struct mlx5_devcom_component *comp;
154
155 if (IS_ERR_OR_NULL(devcom))
156 return;
157
158 WARN_ON(!data);
159
160 comp = &devcom->priv->components[id];
161 down_write(&comp->sem);
162 comp->handler = handler;
163 comp->device[devcom->idx].data = data;
164 up_write(&comp->sem);
165}
166
167void mlx5_devcom_unregister_component(struct mlx5_devcom *devcom,
168 enum mlx5_devcom_components id)
169{
170 struct mlx5_devcom_component *comp;
171
172 if (IS_ERR_OR_NULL(devcom))
173 return;
174
175 comp = &devcom->priv->components[id];
176 down_write(&comp->sem);
177 comp->device[devcom->idx].data = NULL;
178 up_write(&comp->sem);
179}
180
181int mlx5_devcom_send_event(struct mlx5_devcom *devcom,
182 enum mlx5_devcom_components id,
183 int event,
184 void *event_data)
185{
186 struct mlx5_devcom_component *comp;
187 int err = -ENODEV, i;
188
189 if (IS_ERR_OR_NULL(devcom))
190 return err;
191
192 comp = &devcom->priv->components[id];
193 down_write(&comp->sem);
194 for (i = 0; i < MLX5_MAX_PORTS; i++)
195 if (i != devcom->idx && comp->device[i].data) {
196 err = comp->handler(event, comp->device[i].data,
197 event_data);
198 break;
199 }
200
201 up_write(&comp->sem);
202 return err;
203}
204
205void mlx5_devcom_set_paired(struct mlx5_devcom *devcom,
206 enum mlx5_devcom_components id,
207 bool paired)
208{
209 struct mlx5_devcom_component *comp;
210
211 comp = &devcom->priv->components[id];
212 WARN_ON(!rwsem_is_locked(&comp->sem));
213
214 comp->paired = paired;
215}
216
217bool mlx5_devcom_is_paired(struct mlx5_devcom *devcom,
218 enum mlx5_devcom_components id)
219{
220 if (IS_ERR_OR_NULL(devcom))
221 return false;
222
223 return devcom->priv->components[id].paired;
224}
225
226void *mlx5_devcom_get_peer_data(struct mlx5_devcom *devcom,
227 enum mlx5_devcom_components id)
228{
229 struct mlx5_devcom_component *comp;
230 int i;
231
232 if (IS_ERR_OR_NULL(devcom))
233 return NULL;
234
235 comp = &devcom->priv->components[id];
236 down_read(&comp->sem);
237 if (!comp->paired) {
238 up_read(&comp->sem);
239 return NULL;
240 }
241
242 for (i = 0; i < MLX5_MAX_PORTS; i++)
243 if (i != devcom->idx)
244 break;
245
246 return comp->device[i].data;
247}
248
249void mlx5_devcom_release_peer_data(struct mlx5_devcom *devcom,
250 enum mlx5_devcom_components id)
251{
252 struct mlx5_devcom_component *comp = &devcom->priv->components[id];
253
254 up_read(&comp->sem);
255}
256
