2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
33 * $Id: device.c 1349 2004-12-16 21:09:43Z roland $
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 #include <linux/mutex.h>
43 #include "core_priv.h"
45 MODULE_AUTHOR("Roland Dreier");
46 MODULE_DESCRIPTION("core kernel InfiniBand API");
47 MODULE_LICENSE("Dual BSD/GPL");
49 struct ib_client_data {
50 struct list_head list;
51 struct ib_client *client;
55 static LIST_HEAD(device_list);
56 static LIST_HEAD(client_list);
59 * device_mutex protects access to both device_list and client_list.
60 * There's no real point to using multiple locks or something fancier
61 * like an rwsem: we always access both lists, and we're always
62 * modifying one list or the other list. In any case this is not a
63 * hot path so there's no point in trying to optimize.
65 static DEFINE_MUTEX(device_mutex);
67 static int ib_device_check_mandatory(struct ib_device *device)
69 #define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
73 } mandatory_table[] = {
74 IB_MANDATORY_FUNC(query_device),
75 IB_MANDATORY_FUNC(query_port),
76 IB_MANDATORY_FUNC(query_pkey),
77 IB_MANDATORY_FUNC(query_gid),
78 IB_MANDATORY_FUNC(alloc_pd),
79 IB_MANDATORY_FUNC(dealloc_pd),
80 IB_MANDATORY_FUNC(create_ah),
81 IB_MANDATORY_FUNC(destroy_ah),
82 IB_MANDATORY_FUNC(create_qp),
83 IB_MANDATORY_FUNC(modify_qp),
84 IB_MANDATORY_FUNC(destroy_qp),
85 IB_MANDATORY_FUNC(post_send),
86 IB_MANDATORY_FUNC(post_recv),
87 IB_MANDATORY_FUNC(create_cq),
88 IB_MANDATORY_FUNC(destroy_cq),
89 IB_MANDATORY_FUNC(poll_cq),
90 IB_MANDATORY_FUNC(req_notify_cq),
91 IB_MANDATORY_FUNC(get_dma_mr),
92 IB_MANDATORY_FUNC(dereg_mr)
96 for (i = 0; i < sizeof mandatory_table / sizeof mandatory_table[0]; ++i) {
97 if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
98 printk(KERN_WARNING "Device %s is missing mandatory function %s\n",
99 device->name, mandatory_table[i].name);
107 static struct ib_device *__ib_device_get_by_name(const char *name)
109 struct ib_device *device;
111 list_for_each_entry(device, &device_list, core_list)
112 if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
119 static int alloc_name(char *name)
122 char buf[IB_DEVICE_NAME_MAX];
123 struct ib_device *device;
126 inuse = (long *) get_zeroed_page(GFP_KERNEL);
130 list_for_each_entry(device, &device_list, core_list) {
131 if (!sscanf(device->name, name, &i))
133 if (i < 0 || i >= PAGE_SIZE * 8)
135 snprintf(buf, sizeof buf, name, i);
136 if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
140 i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
141 free_page((unsigned long) inuse);
142 snprintf(buf, sizeof buf, name, i);
144 if (__ib_device_get_by_name(buf))
147 strlcpy(name, buf, IB_DEVICE_NAME_MAX);
152 * ib_alloc_device - allocate an IB device struct
153 * @size:size of structure to allocate
155 * Low-level drivers should use ib_alloc_device() to allocate &struct
156 * ib_device. @size is the size of the structure to be allocated,
157 * including any private data used by the low-level driver.
158 * ib_dealloc_device() must be used to free structures allocated with
161 struct ib_device *ib_alloc_device(size_t size)
163 BUG_ON(size < sizeof (struct ib_device));
165 return kzalloc(size, GFP_KERNEL);
167 EXPORT_SYMBOL(ib_alloc_device);
170 * ib_dealloc_device - free an IB device struct
171 * @device:structure to free
173 * Free a structure allocated with ib_alloc_device().
175 void ib_dealloc_device(struct ib_device *device)
177 if (device->reg_state == IB_DEV_UNINITIALIZED) {
182 BUG_ON(device->reg_state != IB_DEV_UNREGISTERED);
184 ib_device_unregister_sysfs(device);
186 EXPORT_SYMBOL(ib_dealloc_device);
188 static int add_client_context(struct ib_device *device, struct ib_client *client)
190 struct ib_client_data *context;
193 context = kmalloc(sizeof *context, GFP_KERNEL);
195 printk(KERN_WARNING "Couldn't allocate client context for %s/%s\n",
196 device->name, client->name);
200 context->client = client;
201 context->data = NULL;
203 spin_lock_irqsave(&device->client_data_lock, flags);
204 list_add(&context->list, &device->client_data_list);
205 spin_unlock_irqrestore(&device->client_data_lock, flags);
211 * ib_register_device - Register an IB device with IB core
212 * @device:Device to register
214 * Low-level drivers use ib_register_device() to register their
215 * devices with the IB core. All registered clients will receive a
216 * callback for each device that is added. @device must be allocated
217 * with ib_alloc_device().
219 int ib_register_device(struct ib_device *device)
223 mutex_lock(&device_mutex);
225 if (strchr(device->name, '%')) {
226 ret = alloc_name(device->name);
231 if (ib_device_check_mandatory(device)) {
236 INIT_LIST_HEAD(&device->event_handler_list);
237 INIT_LIST_HEAD(&device->client_data_list);
238 spin_lock_init(&device->event_handler_lock);
239 spin_lock_init(&device->client_data_lock);
241 ret = ib_device_register_sysfs(device);
243 printk(KERN_WARNING "Couldn't register device %s with driver model\n",
248 list_add_tail(&device->core_list, &device_list);
250 device->reg_state = IB_DEV_REGISTERED;
253 struct ib_client *client;
255 list_for_each_entry(client, &client_list, list)
256 if (client->add && !add_client_context(device, client))
261 mutex_unlock(&device_mutex);
264 EXPORT_SYMBOL(ib_register_device);
267 * ib_unregister_device - Unregister an IB device
268 * @device:Device to unregister
270 * Unregister an IB device. All clients will receive a remove callback.
272 void ib_unregister_device(struct ib_device *device)
274 struct ib_client *client;
275 struct ib_client_data *context, *tmp;
278 mutex_lock(&device_mutex);
280 list_for_each_entry_reverse(client, &client_list, list)
282 client->remove(device);
284 list_del(&device->core_list);
286 mutex_unlock(&device_mutex);
288 spin_lock_irqsave(&device->client_data_lock, flags);
289 list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
291 spin_unlock_irqrestore(&device->client_data_lock, flags);
293 device->reg_state = IB_DEV_UNREGISTERED;
295 EXPORT_SYMBOL(ib_unregister_device);
298 * ib_register_client - Register an IB client
299 * @client:Client to register
301 * Upper level users of the IB drivers can use ib_register_client() to
302 * register callbacks for IB device addition and removal. When an IB
303 * device is added, each registered client's add method will be called
304 * (in the order the clients were registered), and when a device is
305 * removed, each client's remove method will be called (in the reverse
306 * order that clients were registered). In addition, when
307 * ib_register_client() is called, the client will receive an add
308 * callback for all devices already registered.
310 int ib_register_client(struct ib_client *client)
312 struct ib_device *device;
314 mutex_lock(&device_mutex);
316 list_add_tail(&client->list, &client_list);
317 list_for_each_entry(device, &device_list, core_list)
318 if (client->add && !add_client_context(device, client))
321 mutex_unlock(&device_mutex);
325 EXPORT_SYMBOL(ib_register_client);
328 * ib_unregister_client - Unregister an IB client
329 * @client:Client to unregister
331 * Upper level users use ib_unregister_client() to remove their client
332 * registration. When ib_unregister_client() is called, the client
333 * will receive a remove callback for each IB device still registered.
335 void ib_unregister_client(struct ib_client *client)
337 struct ib_client_data *context, *tmp;
338 struct ib_device *device;
341 mutex_lock(&device_mutex);
343 list_for_each_entry(device, &device_list, core_list) {
345 client->remove(device);
347 spin_lock_irqsave(&device->client_data_lock, flags);
348 list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
349 if (context->client == client) {
350 list_del(&context->list);
353 spin_unlock_irqrestore(&device->client_data_lock, flags);
355 list_del(&client->list);
357 mutex_unlock(&device_mutex);
359 EXPORT_SYMBOL(ib_unregister_client);
362 * ib_get_client_data - Get IB client context
363 * @device:Device to get context for
364 * @client:Client to get context for
366 * ib_get_client_data() returns client context set with
367 * ib_set_client_data().
369 void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
371 struct ib_client_data *context;
375 spin_lock_irqsave(&device->client_data_lock, flags);
376 list_for_each_entry(context, &device->client_data_list, list)
377 if (context->client == client) {
381 spin_unlock_irqrestore(&device->client_data_lock, flags);
385 EXPORT_SYMBOL(ib_get_client_data);
388 * ib_set_client_data - Set IB client context
389 * @device:Device to set context for
390 * @client:Client to set context for
391 * @data:Context to set
393 * ib_set_client_data() sets client context that can be retrieved with
394 * ib_get_client_data().
396 void ib_set_client_data(struct ib_device *device, struct ib_client *client,
399 struct ib_client_data *context;
402 spin_lock_irqsave(&device->client_data_lock, flags);
403 list_for_each_entry(context, &device->client_data_list, list)
404 if (context->client == client) {
405 context->data = data;
409 printk(KERN_WARNING "No client context found for %s/%s\n",
410 device->name, client->name);
413 spin_unlock_irqrestore(&device->client_data_lock, flags);
415 EXPORT_SYMBOL(ib_set_client_data);
418 * ib_register_event_handler - Register an IB event handler
419 * @event_handler:Handler to register
421 * ib_register_event_handler() registers an event handler that will be
422 * called back when asynchronous IB events occur (as defined in
423 * chapter 11 of the InfiniBand Architecture Specification). This
424 * callback may occur in interrupt context.
426 int ib_register_event_handler (struct ib_event_handler *event_handler)
430 spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
431 list_add_tail(&event_handler->list,
432 &event_handler->device->event_handler_list);
433 spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
437 EXPORT_SYMBOL(ib_register_event_handler);
440 * ib_unregister_event_handler - Unregister an event handler
441 * @event_handler:Handler to unregister
443 * Unregister an event handler registered with
444 * ib_register_event_handler().
446 int ib_unregister_event_handler(struct ib_event_handler *event_handler)
450 spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
451 list_del(&event_handler->list);
452 spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
456 EXPORT_SYMBOL(ib_unregister_event_handler);
459 * ib_dispatch_event - Dispatch an asynchronous event
460 * @event:Event to dispatch
462 * Low-level drivers must call ib_dispatch_event() to dispatch the
463 * event to all registered event handlers when an asynchronous event
466 void ib_dispatch_event(struct ib_event *event)
469 struct ib_event_handler *handler;
471 spin_lock_irqsave(&event->device->event_handler_lock, flags);
473 list_for_each_entry(handler, &event->device->event_handler_list, list)
474 handler->handler(handler, event);
476 spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
478 EXPORT_SYMBOL(ib_dispatch_event);
481 * ib_query_device - Query IB device attributes
482 * @device:Device to query
483 * @device_attr:Device attributes
485 * ib_query_device() returns the attributes of a device through the
486 * @device_attr pointer.
488 int ib_query_device(struct ib_device *device,
489 struct ib_device_attr *device_attr)
491 return device->query_device(device, device_attr);
493 EXPORT_SYMBOL(ib_query_device);
496 * ib_query_port - Query IB port attributes
497 * @device:Device to query
498 * @port_num:Port number to query
499 * @port_attr:Port attributes
501 * ib_query_port() returns the attributes of a port through the
502 * @port_attr pointer.
504 int ib_query_port(struct ib_device *device,
506 struct ib_port_attr *port_attr)
508 if (device->node_type == RDMA_NODE_IB_SWITCH) {
511 } else if (port_num < 1 || port_num > device->phys_port_cnt)
514 return device->query_port(device, port_num, port_attr);
516 EXPORT_SYMBOL(ib_query_port);
519 * ib_query_gid - Get GID table entry
520 * @device:Device to query
521 * @port_num:Port number to query
522 * @index:GID table index to query
525 * ib_query_gid() fetches the specified GID table entry.
527 int ib_query_gid(struct ib_device *device,
528 u8 port_num, int index, union ib_gid *gid)
530 return device->query_gid(device, port_num, index, gid);
532 EXPORT_SYMBOL(ib_query_gid);
535 * ib_query_pkey - Get P_Key table entry
536 * @device:Device to query
537 * @port_num:Port number to query
538 * @index:P_Key table index to query
539 * @pkey:Returned P_Key
541 * ib_query_pkey() fetches the specified P_Key table entry.
543 int ib_query_pkey(struct ib_device *device,
544 u8 port_num, u16 index, u16 *pkey)
546 return device->query_pkey(device, port_num, index, pkey);
548 EXPORT_SYMBOL(ib_query_pkey);
551 * ib_modify_device - Change IB device attributes
552 * @device:Device to modify
553 * @device_modify_mask:Mask of attributes to change
554 * @device_modify:New attribute values
556 * ib_modify_device() changes a device's attributes as specified by
557 * the @device_modify_mask and @device_modify structure.
559 int ib_modify_device(struct ib_device *device,
560 int device_modify_mask,
561 struct ib_device_modify *device_modify)
563 return device->modify_device(device, device_modify_mask,
566 EXPORT_SYMBOL(ib_modify_device);
569 * ib_modify_port - Modifies the attributes for the specified port.
570 * @device: The device to modify.
571 * @port_num: The number of the port to modify.
572 * @port_modify_mask: Mask used to specify which attributes of the port
574 * @port_modify: New attribute values for the port.
576 * ib_modify_port() changes a port's attributes as specified by the
577 * @port_modify_mask and @port_modify structure.
579 int ib_modify_port(struct ib_device *device,
580 u8 port_num, int port_modify_mask,
581 struct ib_port_modify *port_modify)
583 if (device->node_type == RDMA_NODE_IB_SWITCH) {
586 } else if (port_num < 1 || port_num > device->phys_port_cnt)
589 return device->modify_port(device, port_num, port_modify_mask,
592 EXPORT_SYMBOL(ib_modify_port);
594 static int __init ib_core_init(void)
598 ret = ib_sysfs_setup();
600 printk(KERN_WARNING "Couldn't create InfiniBand device class\n");
602 ret = ib_cache_setup();
604 printk(KERN_WARNING "Couldn't set up InfiniBand P_Key/GID cache\n");
611 static void __exit ib_core_cleanup(void)
617 module_init(ib_core_init);
618 module_exit(ib_core_cleanup);