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558c9a0fc8b968fad2ee02ea199a4d8b640a4638
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / core / cache.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 *
35 * $Id: cache.c 1349 2004-12-16 21:09:43Z roland $
36 */
37
38 #include <linux/module.h>
39 #include <linux/errno.h>
40 #include <linux/slab.h>
41
42 #include <rdma/ib_cache.h>
43
44 #include "core_priv.h"
45
46 struct ib_pkey_cache {
47 int table_len;
48 u16 table[0];
49 };
50
51 struct ib_gid_cache {
52 int table_len;
53 union ib_gid table[0];
54 };
55
56 struct ib_update_work {
57 struct work_struct work;
58 struct ib_device *device;
59 u8 port_num;
60 };
61
62 static inline int start_port(struct ib_device *device)
63 {
64 return (device->node_type == RDMA_NODE_IB_SWITCH) ? 0 : 1;
65 }
66
67 static inline int end_port(struct ib_device *device)
68 {
69 return (device->node_type == RDMA_NODE_IB_SWITCH) ?
70 0 : device->phys_port_cnt;
71 }
72
73 int ib_get_cached_gid(struct ib_device *device,
74 u8 port_num,
75 int index,
76 union ib_gid *gid)
77 {
78 struct ib_gid_cache *cache;
79 unsigned long flags;
80 int ret = 0;
81
82 if (port_num < start_port(device) || port_num > end_port(device))
83 return -EINVAL;
84
85 read_lock_irqsave(&device->cache.lock, flags);
86
87 cache = device->cache.gid_cache[port_num - start_port(device)];
88
89 if (index < 0 || index >= cache->table_len)
90 ret = -EINVAL;
91 else
92 *gid = cache->table[index];
93
94 read_unlock_irqrestore(&device->cache.lock, flags);
95
96 return ret;
97 }
98 EXPORT_SYMBOL(ib_get_cached_gid);
99
100 int ib_find_cached_gid(struct ib_device *device,
101 union ib_gid *gid,
102 u8 *port_num,
103 u16 *index)
104 {
105 struct ib_gid_cache *cache;
106 unsigned long flags;
107 int p, i;
108 int ret = -ENOENT;
109
110 *port_num = -1;
111 if (index)
112 *index = -1;
113
114 read_lock_irqsave(&device->cache.lock, flags);
115
116 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
117 cache = device->cache.gid_cache[p];
118 for (i = 0; i < cache->table_len; ++i) {
119 if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
120 *port_num = p + start_port(device);
121 if (index)
122 *index = i;
123 ret = 0;
124 goto found;
125 }
126 }
127 }
128 found:
129 read_unlock_irqrestore(&device->cache.lock, flags);
130
131 return ret;
132 }
133 EXPORT_SYMBOL(ib_find_cached_gid);
134
135 int ib_get_cached_pkey(struct ib_device *device,
136 u8 port_num,
137 int index,
138 u16 *pkey)
139 {
140 struct ib_pkey_cache *cache;
141 unsigned long flags;
142 int ret = 0;
143
144 if (port_num < start_port(device) || port_num > end_port(device))
145 return -EINVAL;
146
147 read_lock_irqsave(&device->cache.lock, flags);
148
149 cache = device->cache.pkey_cache[port_num - start_port(device)];
150
151 if (index < 0 || index >= cache->table_len)
152 ret = -EINVAL;
153 else
154 *pkey = cache->table[index];
155
156 read_unlock_irqrestore(&device->cache.lock, flags);
157
158 return ret;
159 }
160 EXPORT_SYMBOL(ib_get_cached_pkey);
161
162 int ib_find_cached_pkey(struct ib_device *device,
163 u8 port_num,
164 u16 pkey,
165 u16 *index)
166 {
167 struct ib_pkey_cache *cache;
168 unsigned long flags;
169 int i;
170 int ret = -ENOENT;
171
172 if (port_num < start_port(device) || port_num > end_port(device))
173 return -EINVAL;
174
175 read_lock_irqsave(&device->cache.lock, flags);
176
177 cache = device->cache.pkey_cache[port_num - start_port(device)];
178
179 *index = -1;
180
181 for (i = 0; i < cache->table_len; ++i)
182 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
183 *index = i;
184 ret = 0;
185 break;
186 }
187
188 read_unlock_irqrestore(&device->cache.lock, flags);
189
190 return ret;
191 }
192 EXPORT_SYMBOL(ib_find_cached_pkey);
193
194 int ib_get_cached_lmc(struct ib_device *device,
195 u8 port_num,
196 u8 *lmc)
197 {
198 unsigned long flags;
199 int ret = 0;
200
201 if (port_num < start_port(device) || port_num > end_port(device))
202 return -EINVAL;
203
204 read_lock_irqsave(&device->cache.lock, flags);
205 *lmc = device->cache.lmc_cache[port_num - start_port(device)];
206 read_unlock_irqrestore(&device->cache.lock, flags);
207
208 return ret;
209 }
210 EXPORT_SYMBOL(ib_get_cached_lmc);
211
212 static void ib_cache_update(struct ib_device *device,
213 u8 port)
214 {
215 struct ib_port_attr *tprops = NULL;
216 struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
217 struct ib_gid_cache *gid_cache = NULL, *old_gid_cache;
218 int i;
219 int ret;
220
221 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
222 if (!tprops)
223 return;
224
225 ret = ib_query_port(device, port, tprops);
226 if (ret) {
227 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
228 ret, device->name);
229 goto err;
230 }
231
232 pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
233 sizeof *pkey_cache->table, GFP_KERNEL);
234 if (!pkey_cache)
235 goto err;
236
237 pkey_cache->table_len = tprops->pkey_tbl_len;
238
239 gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
240 sizeof *gid_cache->table, GFP_KERNEL);
241 if (!gid_cache)
242 goto err;
243
244 gid_cache->table_len = tprops->gid_tbl_len;
245
246 for (i = 0; i < pkey_cache->table_len; ++i) {
247 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
248 if (ret) {
249 printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
250 ret, device->name, i);
251 goto err;
252 }
253 }
254
255 for (i = 0; i < gid_cache->table_len; ++i) {
256 ret = ib_query_gid(device, port, i, gid_cache->table + i);
257 if (ret) {
258 printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
259 ret, device->name, i);
260 goto err;
261 }
262 }
263
264 write_lock_irq(&device->cache.lock);
265
266 old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
267 old_gid_cache = device->cache.gid_cache [port - start_port(device)];
268
269 device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
270 device->cache.gid_cache [port - start_port(device)] = gid_cache;
271
272 device->cache.lmc_cache[port - start_port(device)] = tprops->lmc;
273
274 write_unlock_irq(&device->cache.lock);
275
276 kfree(old_pkey_cache);
277 kfree(old_gid_cache);
278 kfree(tprops);
279 return;
280
281 err:
282 kfree(pkey_cache);
283 kfree(gid_cache);
284 kfree(tprops);
285 }
286
287 static void ib_cache_task(struct work_struct *_work)
288 {
289 struct ib_update_work *work =
290 container_of(_work, struct ib_update_work, work);
291
292 ib_cache_update(work->device, work->port_num);
293 kfree(work);
294 }
295
296 static void ib_cache_event(struct ib_event_handler *handler,
297 struct ib_event *event)
298 {
299 struct ib_update_work *work;
300
301 if (event->event == IB_EVENT_PORT_ERR ||
302 event->event == IB_EVENT_PORT_ACTIVE ||
303 event->event == IB_EVENT_LID_CHANGE ||
304 event->event == IB_EVENT_PKEY_CHANGE ||
305 event->event == IB_EVENT_SM_CHANGE ||
306 event->event == IB_EVENT_CLIENT_REREGISTER) {
307 work = kmalloc(sizeof *work, GFP_ATOMIC);
308 if (work) {
309 INIT_WORK(&work->work, ib_cache_task);
310 work->device = event->device;
311 work->port_num = event->element.port_num;
312 schedule_work(&work->work);
313 }
314 }
315 }
316
317 static void ib_cache_setup_one(struct ib_device *device)
318 {
319 int p;
320
321 rwlock_init(&device->cache.lock);
322
323 device->cache.pkey_cache =
324 kmalloc(sizeof *device->cache.pkey_cache *
325 (end_port(device) - start_port(device) + 1), GFP_KERNEL);
326 device->cache.gid_cache =
327 kmalloc(sizeof *device->cache.gid_cache *
328 (end_port(device) - start_port(device) + 1), GFP_KERNEL);
329
330 device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
331 (end_port(device) -
332 start_port(device) + 1),
333 GFP_KERNEL);
334
335 if (!device->cache.pkey_cache || !device->cache.gid_cache ||
336 !device->cache.lmc_cache) {
337 printk(KERN_WARNING "Couldn't allocate cache "
338 "for %s\n", device->name);
339 goto err;
340 }
341
342 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
343 device->cache.pkey_cache[p] = NULL;
344 device->cache.gid_cache [p] = NULL;
345 ib_cache_update(device, p + start_port(device));
346 }
347
348 INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
349 device, ib_cache_event);
350 if (ib_register_event_handler(&device->cache.event_handler))
351 goto err_cache;
352
353 return;
354
355 err_cache:
356 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
357 kfree(device->cache.pkey_cache[p]);
358 kfree(device->cache.gid_cache[p]);
359 }
360
361 err:
362 kfree(device->cache.pkey_cache);
363 kfree(device->cache.gid_cache);
364 kfree(device->cache.lmc_cache);
365 }
366
367 static void ib_cache_cleanup_one(struct ib_device *device)
368 {
369 int p;
370
371 ib_unregister_event_handler(&device->cache.event_handler);
372 flush_scheduled_work();
373
374 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
375 kfree(device->cache.pkey_cache[p]);
376 kfree(device->cache.gid_cache[p]);
377 }
378
379 kfree(device->cache.pkey_cache);
380 kfree(device->cache.gid_cache);
381 kfree(device->cache.lmc_cache);
382 }
383
384 static struct ib_client cache_client = {
385 .name = "cache",
386 .add = ib_cache_setup_one,
387 .remove = ib_cache_cleanup_one
388 };
389
390 int __init ib_cache_setup(void)
391 {
392 return ib_register_client(&cache_client);
393 }
394
395 void __exit ib_cache_cleanup(void)
396 {
397 ib_unregister_client(&cache_client);
398 }
kernel source for telekom puls (alcatel/mediatek)