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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
Roland Dreier2a1d9b72005-08-10 23:03:10 -07003 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 *
33 * $Id: device.c 1349 2004-12-16 21:09:43Z roland $
34 */
35
36#include <linux/module.h>
37#include <linux/string.h>
38#include <linux/errno.h>
39#include <linux/slab.h>
40#include <linux/init.h>
41
42#include <asm/semaphore.h>
43
44#include "core_priv.h"
45
46MODULE_AUTHOR("Roland Dreier");
47MODULE_DESCRIPTION("core kernel InfiniBand API");
48MODULE_LICENSE("Dual BSD/GPL");
49
50struct ib_client_data {
51 struct list_head list;
52 struct ib_client *client;
53 void * data;
54};
55
56static LIST_HEAD(device_list);
57static LIST_HEAD(client_list);
58
59/*
60 * device_sem protects access to both device_list and client_list.
61 * There's no real point to using multiple locks or something fancier
62 * like an rwsem: we always access both lists, and we're always
63 * modifying one list or the other list. In any case this is not a
64 * hot path so there's no point in trying to optimize.
65 */
66static DECLARE_MUTEX(device_sem);
67
68static int ib_device_check_mandatory(struct ib_device *device)
69{
70#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
71 static const struct {
72 size_t offset;
73 char *name;
74 } mandatory_table[] = {
75 IB_MANDATORY_FUNC(query_device),
76 IB_MANDATORY_FUNC(query_port),
77 IB_MANDATORY_FUNC(query_pkey),
78 IB_MANDATORY_FUNC(query_gid),
79 IB_MANDATORY_FUNC(alloc_pd),
80 IB_MANDATORY_FUNC(dealloc_pd),
81 IB_MANDATORY_FUNC(create_ah),
82 IB_MANDATORY_FUNC(destroy_ah),
83 IB_MANDATORY_FUNC(create_qp),
84 IB_MANDATORY_FUNC(modify_qp),
85 IB_MANDATORY_FUNC(destroy_qp),
86 IB_MANDATORY_FUNC(post_send),
87 IB_MANDATORY_FUNC(post_recv),
88 IB_MANDATORY_FUNC(create_cq),
89 IB_MANDATORY_FUNC(destroy_cq),
90 IB_MANDATORY_FUNC(poll_cq),
91 IB_MANDATORY_FUNC(req_notify_cq),
92 IB_MANDATORY_FUNC(get_dma_mr),
93 IB_MANDATORY_FUNC(dereg_mr)
94 };
95 int i;
96
97 for (i = 0; i < sizeof mandatory_table / sizeof mandatory_table[0]; ++i) {
98 if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
99 printk(KERN_WARNING "Device %s is missing mandatory function %s\n",
100 device->name, mandatory_table[i].name);
101 return -EINVAL;
102 }
103 }
104
105 return 0;
106}
107
108static struct ib_device *__ib_device_get_by_name(const char *name)
109{
110 struct ib_device *device;
111
112 list_for_each_entry(device, &device_list, core_list)
113 if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
114 return device;
115
116 return NULL;
117}
118
119
120static int alloc_name(char *name)
121{
122 long *inuse;
123 char buf[IB_DEVICE_NAME_MAX];
124 struct ib_device *device;
125 int i;
126
127 inuse = (long *) get_zeroed_page(GFP_KERNEL);
128 if (!inuse)
129 return -ENOMEM;
130
131 list_for_each_entry(device, &device_list, core_list) {
132 if (!sscanf(device->name, name, &i))
133 continue;
134 if (i < 0 || i >= PAGE_SIZE * 8)
135 continue;
136 snprintf(buf, sizeof buf, name, i);
137 if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
138 set_bit(i, inuse);
139 }
140
141 i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
142 free_page((unsigned long) inuse);
143 snprintf(buf, sizeof buf, name, i);
144
145 if (__ib_device_get_by_name(buf))
146 return -ENFILE;
147
148 strlcpy(name, buf, IB_DEVICE_NAME_MAX);
149 return 0;
150}
151
152/**
153 * ib_alloc_device - allocate an IB device struct
154 * @size:size of structure to allocate
155 *
156 * Low-level drivers should use ib_alloc_device() to allocate &struct
157 * ib_device. @size is the size of the structure to be allocated,
158 * including any private data used by the low-level driver.
159 * ib_dealloc_device() must be used to free structures allocated with
160 * ib_alloc_device().
161 */
162struct ib_device *ib_alloc_device(size_t size)
163{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 BUG_ON(size < sizeof (struct ib_device));
165
Roland Dreierde6eb662005-11-02 07:23:14 -0800166 return kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168EXPORT_SYMBOL(ib_alloc_device);
169
170/**
171 * ib_dealloc_device - free an IB device struct
172 * @device:structure to free
173 *
174 * Free a structure allocated with ib_alloc_device().
175 */
176void ib_dealloc_device(struct ib_device *device)
177{
178 if (device->reg_state == IB_DEV_UNINITIALIZED) {
179 kfree(device);
180 return;
181 }
182
183 BUG_ON(device->reg_state != IB_DEV_UNREGISTERED);
184
185 ib_device_unregister_sysfs(device);
186}
187EXPORT_SYMBOL(ib_dealloc_device);
188
189static int add_client_context(struct ib_device *device, struct ib_client *client)
190{
191 struct ib_client_data *context;
192 unsigned long flags;
193
194 context = kmalloc(sizeof *context, GFP_KERNEL);
195 if (!context) {
196 printk(KERN_WARNING "Couldn't allocate client context for %s/%s\n",
197 device->name, client->name);
198 return -ENOMEM;
199 }
200
201 context->client = client;
202 context->data = NULL;
203
204 spin_lock_irqsave(&device->client_data_lock, flags);
205 list_add(&context->list, &device->client_data_list);
206 spin_unlock_irqrestore(&device->client_data_lock, flags);
207
208 return 0;
209}
210
211/**
212 * ib_register_device - Register an IB device with IB core
213 * @device:Device to register
214 *
215 * Low-level drivers use ib_register_device() to register their
216 * devices with the IB core. All registered clients will receive a
217 * callback for each device that is added. @device must be allocated
218 * with ib_alloc_device().
219 */
220int ib_register_device(struct ib_device *device)
221{
222 int ret;
223
224 down(&device_sem);
225
226 if (strchr(device->name, '%')) {
227 ret = alloc_name(device->name);
228 if (ret)
229 goto out;
230 }
231
232 if (ib_device_check_mandatory(device)) {
233 ret = -EINVAL;
234 goto out;
235 }
236
237 INIT_LIST_HEAD(&device->event_handler_list);
238 INIT_LIST_HEAD(&device->client_data_list);
239 spin_lock_init(&device->event_handler_lock);
240 spin_lock_init(&device->client_data_lock);
241
242 ret = ib_device_register_sysfs(device);
243 if (ret) {
244 printk(KERN_WARNING "Couldn't register device %s with driver model\n",
245 device->name);
246 goto out;
247 }
248
249 list_add_tail(&device->core_list, &device_list);
250
251 device->reg_state = IB_DEV_REGISTERED;
252
253 {
254 struct ib_client *client;
255
256 list_for_each_entry(client, &client_list, list)
257 if (client->add && !add_client_context(device, client))
258 client->add(device);
259 }
260
261 out:
262 up(&device_sem);
263 return ret;
264}
265EXPORT_SYMBOL(ib_register_device);
266
267/**
268 * ib_unregister_device - Unregister an IB device
269 * @device:Device to unregister
270 *
271 * Unregister an IB device. All clients will receive a remove callback.
272 */
273void ib_unregister_device(struct ib_device *device)
274{
275 struct ib_client *client;
276 struct ib_client_data *context, *tmp;
277 unsigned long flags;
278
279 down(&device_sem);
280
281 list_for_each_entry_reverse(client, &client_list, list)
282 if (client->remove)
283 client->remove(device);
284
285 list_del(&device->core_list);
286
287 up(&device_sem);
288
289 spin_lock_irqsave(&device->client_data_lock, flags);
290 list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
291 kfree(context);
292 spin_unlock_irqrestore(&device->client_data_lock, flags);
293
294 device->reg_state = IB_DEV_UNREGISTERED;
295}
296EXPORT_SYMBOL(ib_unregister_device);
297
298/**
299 * ib_register_client - Register an IB client
300 * @client:Client to register
301 *
302 * Upper level users of the IB drivers can use ib_register_client() to
303 * register callbacks for IB device addition and removal. When an IB
304 * device is added, each registered client's add method will be called
305 * (in the order the clients were registered), and when a device is
306 * removed, each client's remove method will be called (in the reverse
307 * order that clients were registered). In addition, when
308 * ib_register_client() is called, the client will receive an add
309 * callback for all devices already registered.
310 */
311int ib_register_client(struct ib_client *client)
312{
313 struct ib_device *device;
314
315 down(&device_sem);
316
317 list_add_tail(&client->list, &client_list);
318 list_for_each_entry(device, &device_list, core_list)
319 if (client->add && !add_client_context(device, client))
320 client->add(device);
321
322 up(&device_sem);
323
324 return 0;
325}
326EXPORT_SYMBOL(ib_register_client);
327
328/**
329 * ib_unregister_client - Unregister an IB client
330 * @client:Client to unregister
331 *
332 * Upper level users use ib_unregister_client() to remove their client
333 * registration. When ib_unregister_client() is called, the client
334 * will receive a remove callback for each IB device still registered.
335 */
336void ib_unregister_client(struct ib_client *client)
337{
338 struct ib_client_data *context, *tmp;
339 struct ib_device *device;
340 unsigned long flags;
341
342 down(&device_sem);
343
344 list_for_each_entry(device, &device_list, core_list) {
345 if (client->remove)
346 client->remove(device);
347
348 spin_lock_irqsave(&device->client_data_lock, flags);
349 list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
350 if (context->client == client) {
351 list_del(&context->list);
352 kfree(context);
353 }
354 spin_unlock_irqrestore(&device->client_data_lock, flags);
355 }
356 list_del(&client->list);
357
358 up(&device_sem);
359}
360EXPORT_SYMBOL(ib_unregister_client);
361
362/**
363 * ib_get_client_data - Get IB client context
364 * @device:Device to get context for
365 * @client:Client to get context for
366 *
367 * ib_get_client_data() returns client context set with
368 * ib_set_client_data().
369 */
370void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
371{
372 struct ib_client_data *context;
373 void *ret = NULL;
374 unsigned long flags;
375
376 spin_lock_irqsave(&device->client_data_lock, flags);
377 list_for_each_entry(context, &device->client_data_list, list)
378 if (context->client == client) {
379 ret = context->data;
380 break;
381 }
382 spin_unlock_irqrestore(&device->client_data_lock, flags);
383
384 return ret;
385}
386EXPORT_SYMBOL(ib_get_client_data);
387
388/**
389 * ib_set_client_data - Get IB client context
390 * @device:Device to set context for
391 * @client:Client to set context for
392 * @data:Context to set
393 *
394 * ib_set_client_data() sets client context that can be retrieved with
395 * ib_get_client_data().
396 */
397void ib_set_client_data(struct ib_device *device, struct ib_client *client,
398 void *data)
399{
400 struct ib_client_data *context;
401 unsigned long flags;
402
403 spin_lock_irqsave(&device->client_data_lock, flags);
404 list_for_each_entry(context, &device->client_data_list, list)
405 if (context->client == client) {
406 context->data = data;
407 goto out;
408 }
409
410 printk(KERN_WARNING "No client context found for %s/%s\n",
411 device->name, client->name);
412
413out:
414 spin_unlock_irqrestore(&device->client_data_lock, flags);
415}
416EXPORT_SYMBOL(ib_set_client_data);
417
418/**
419 * ib_register_event_handler - Register an IB event handler
420 * @event_handler:Handler to register
421 *
422 * ib_register_event_handler() registers an event handler that will be
423 * called back when asynchronous IB events occur (as defined in
424 * chapter 11 of the InfiniBand Architecture Specification). This
425 * callback may occur in interrupt context.
426 */
427int ib_register_event_handler (struct ib_event_handler *event_handler)
428{
429 unsigned long flags;
430
431 spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
432 list_add_tail(&event_handler->list,
433 &event_handler->device->event_handler_list);
434 spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
435
436 return 0;
437}
438EXPORT_SYMBOL(ib_register_event_handler);
439
440/**
441 * ib_unregister_event_handler - Unregister an event handler
442 * @event_handler:Handler to unregister
443 *
444 * Unregister an event handler registered with
445 * ib_register_event_handler().
446 */
447int ib_unregister_event_handler(struct ib_event_handler *event_handler)
448{
449 unsigned long flags;
450
451 spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
452 list_del(&event_handler->list);
453 spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
454
455 return 0;
456}
457EXPORT_SYMBOL(ib_unregister_event_handler);
458
459/**
460 * ib_dispatch_event - Dispatch an asynchronous event
461 * @event:Event to dispatch
462 *
463 * Low-level drivers must call ib_dispatch_event() to dispatch the
464 * event to all registered event handlers when an asynchronous event
465 * occurs.
466 */
467void ib_dispatch_event(struct ib_event *event)
468{
469 unsigned long flags;
470 struct ib_event_handler *handler;
471
472 spin_lock_irqsave(&event->device->event_handler_lock, flags);
473
474 list_for_each_entry(handler, &event->device->event_handler_list, list)
475 handler->handler(handler, event);
476
477 spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
478}
479EXPORT_SYMBOL(ib_dispatch_event);
480
481/**
482 * ib_query_device - Query IB device attributes
483 * @device:Device to query
484 * @device_attr:Device attributes
485 *
486 * ib_query_device() returns the attributes of a device through the
487 * @device_attr pointer.
488 */
489int ib_query_device(struct ib_device *device,
490 struct ib_device_attr *device_attr)
491{
492 return device->query_device(device, device_attr);
493}
494EXPORT_SYMBOL(ib_query_device);
495
496/**
497 * ib_query_port - Query IB port attributes
498 * @device:Device to query
499 * @port_num:Port number to query
500 * @port_attr:Port attributes
501 *
502 * ib_query_port() returns the attributes of a port through the
503 * @port_attr pointer.
504 */
505int ib_query_port(struct ib_device *device,
506 u8 port_num,
507 struct ib_port_attr *port_attr)
508{
Roland Dreier116c0072005-10-03 09:32:33 -0700509 if (device->node_type == IB_NODE_SWITCH) {
510 if (port_num)
511 return -EINVAL;
512 } else if (port_num < 1 || port_num > device->phys_port_cnt)
513 return -EINVAL;
514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 return device->query_port(device, port_num, port_attr);
516}
517EXPORT_SYMBOL(ib_query_port);
518
519/**
520 * ib_query_gid - Get GID table entry
521 * @device:Device to query
522 * @port_num:Port number to query
523 * @index:GID table index to query
524 * @gid:Returned GID
525 *
526 * ib_query_gid() fetches the specified GID table entry.
527 */
528int ib_query_gid(struct ib_device *device,
529 u8 port_num, int index, union ib_gid *gid)
530{
531 return device->query_gid(device, port_num, index, gid);
532}
533EXPORT_SYMBOL(ib_query_gid);
534
535/**
536 * ib_query_pkey - Get P_Key table entry
537 * @device:Device to query
538 * @port_num:Port number to query
539 * @index:P_Key table index to query
540 * @pkey:Returned P_Key
541 *
542 * ib_query_pkey() fetches the specified P_Key table entry.
543 */
544int ib_query_pkey(struct ib_device *device,
545 u8 port_num, u16 index, u16 *pkey)
546{
547 return device->query_pkey(device, port_num, index, pkey);
548}
549EXPORT_SYMBOL(ib_query_pkey);
550
551/**
552 * ib_modify_device - Change IB device attributes
553 * @device:Device to modify
554 * @device_modify_mask:Mask of attributes to change
555 * @device_modify:New attribute values
556 *
557 * ib_modify_device() changes a device's attributes as specified by
558 * the @device_modify_mask and @device_modify structure.
559 */
560int ib_modify_device(struct ib_device *device,
561 int device_modify_mask,
562 struct ib_device_modify *device_modify)
563{
564 return device->modify_device(device, device_modify_mask,
565 device_modify);
566}
567EXPORT_SYMBOL(ib_modify_device);
568
569/**
570 * ib_modify_port - Modifies the attributes for the specified port.
571 * @device: The device to modify.
572 * @port_num: The number of the port to modify.
573 * @port_modify_mask: Mask used to specify which attributes of the port
574 * to change.
575 * @port_modify: New attribute values for the port.
576 *
577 * ib_modify_port() changes a port's attributes as specified by the
578 * @port_modify_mask and @port_modify structure.
579 */
580int ib_modify_port(struct ib_device *device,
581 u8 port_num, int port_modify_mask,
582 struct ib_port_modify *port_modify)
583{
Roland Dreier116c0072005-10-03 09:32:33 -0700584 if (device->node_type == IB_NODE_SWITCH) {
585 if (port_num)
586 return -EINVAL;
587 } else if (port_num < 1 || port_num > device->phys_port_cnt)
588 return -EINVAL;
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return device->modify_port(device, port_num, port_modify_mask,
591 port_modify);
592}
593EXPORT_SYMBOL(ib_modify_port);
594
595static int __init ib_core_init(void)
596{
597 int ret;
598
599 ret = ib_sysfs_setup();
600 if (ret)
601 printk(KERN_WARNING "Couldn't create InfiniBand device class\n");
602
603 ret = ib_cache_setup();
604 if (ret) {
605 printk(KERN_WARNING "Couldn't set up InfiniBand P_Key/GID cache\n");
606 ib_sysfs_cleanup();
607 }
608
609 return ret;
610}
611
612static void __exit ib_core_cleanup(void)
613{
614 ib_cache_cleanup();
615 ib_sysfs_cleanup();
616}
617
618module_init(ib_core_init);
619module_exit(ib_core_cleanup);