drivers/infiniband/core/device.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  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  * $Id: device.c 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/string.h>
  37 #include <linux/errno.h>
  38 #include <linux/slab.h>
  39 #include <linux/init.h>
  40
  41 #include <asm/semaphore.h>
  42
  43 #include "core_priv.h"
  44
  45 MODULE_AUTHOR("Roland Dreier");
  46 MODULE_DESCRIPTION("core kernel InfiniBand API");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48
  49 struct ib_client_data {
  50         struct list_head  list;
  51         struct ib_client *client;
  52         void *            data;
  53 };
  54
  55 static LIST_HEAD(device_list);
  56 static LIST_HEAD(client_list);
  57
  58 /*
  59  * device_sem 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.
  64  */
  65 static DECLARE_MUTEX(device_sem);
  66
  67 static int ib_device_check_mandatory(struct ib_device *device)
  68 {
  69 #define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
  70         static const struct {
  71                 size_t offset;
  72                 char  *name;
  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)
  93         };
  94         int i;
  95
  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);
 100                         return -EINVAL;
 101                 }
 102         }
 103
 104         return 0;
 105 }
 106
 107 static struct ib_device *__ib_device_get_by_name(const char *name)
 108 {
 109         struct ib_device *device;
 110
 111         list_for_each_entry(device, &device_list, core_list)
 112                 if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
 113                         return device;
 114
 115         return NULL;
 116 }
 117
 118
 119 static int alloc_name(char *name)
 120 {
 121         long *inuse;
 122         char buf[IB_DEVICE_NAME_MAX];
 123         struct ib_device *device;
 124         int i;
 125
 126         inuse = (long *) get_zeroed_page(GFP_KERNEL);
 127         if (!inuse)
 128                 return -ENOMEM;
 129
 130         list_for_each_entry(device, &device_list, core_list) {
 131                 if (!sscanf(device->name, name, &i))
 132                         continue;
 133                 if (i < 0 || i >= PAGE_SIZE * 8)
 134                         continue;
 135                 snprintf(buf, sizeof buf, name, i);
 136                 if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
 137                         set_bit(i, inuse);
 138         }
 139
 140         i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
 141         free_page((unsigned long) inuse);
 142         snprintf(buf, sizeof buf, name, i);
 143
 144         if (__ib_device_get_by_name(buf))
 145                 return -ENFILE;
 146
 147         strlcpy(name, buf, IB_DEVICE_NAME_MAX);
 148         return 0;
 149 }
 150
 151 /**
 152  * ib_alloc_device - allocate an IB device struct
 153  * @size:size of structure to allocate
 154  *
 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
 159  * ib_alloc_device().
 160  */
 161 struct ib_device *ib_alloc_device(size_t size)
 162 {
 163         void *dev;
 164
 165         BUG_ON(size < sizeof (struct ib_device));
 166
 167         dev = kmalloc(size, GFP_KERNEL);
 168         if (!dev)
 169                 return NULL;
 170
 171         memset(dev, 0, size);
 172
 173         return dev;
 174 }
 175 EXPORT_SYMBOL(ib_alloc_device);
 176
 177 /**
 178  * ib_dealloc_device - free an IB device struct
 179  * @device:structure to free
 180  *
 181  * Free a structure allocated with ib_alloc_device().
 182  */
 183 void ib_dealloc_device(struct ib_device *device)
 184 {
 185         if (device->reg_state == IB_DEV_UNINITIALIZED) {
 186                 kfree(device);
 187                 return;
 188         }
 189
 190         BUG_ON(device->reg_state != IB_DEV_UNREGISTERED);
 191
 192         ib_device_unregister_sysfs(device);
 193 }
 194 EXPORT_SYMBOL(ib_dealloc_device);
 195
 196 static int add_client_context(struct ib_device *device, struct ib_client *client)
 197 {
 198         struct ib_client_data *context;
 199         unsigned long flags;
 200
 201         context = kmalloc(sizeof *context, GFP_KERNEL);
 202         if (!context) {
 203                 printk(KERN_WARNING "Couldn't allocate client context for %s/%s\n",
 204                        device->name, client->name);
 205                 return -ENOMEM;
 206         }
 207
 208         context->client = client;
 209         context->data   = NULL;
 210
 211         spin_lock_irqsave(&device->client_data_lock, flags);
 212         list_add(&context->list, &device->client_data_list);
 213         spin_unlock_irqrestore(&device->client_data_lock, flags);
 214
 215         return 0;
 216 }
 217
 218 /**
 219  * ib_register_device - Register an IB device with IB core
 220  * @device:Device to register
 221  *
 222  * Low-level drivers use ib_register_device() to register their
 223  * devices with the IB core.  All registered clients will receive a
 224  * callback for each device that is added. @device must be allocated
 225  * with ib_alloc_device().
 226  */
 227 int ib_register_device(struct ib_device *device)
 228 {
 229         int ret;
 230
 231         down(&device_sem);
 232
 233         if (strchr(device->name, '%')) {
 234                 ret = alloc_name(device->name);
 235                 if (ret)
 236                         goto out;
 237         }
 238
 239         if (ib_device_check_mandatory(device)) {
 240                 ret = -EINVAL;
 241                 goto out;
 242         }
 243
 244         INIT_LIST_HEAD(&device->event_handler_list);
 245         INIT_LIST_HEAD(&device->client_data_list);
 246         spin_lock_init(&device->event_handler_lock);
 247         spin_lock_init(&device->client_data_lock);
 248
 249         ret = ib_device_register_sysfs(device);
 250         if (ret) {
 251                 printk(KERN_WARNING "Couldn't register device %s with driver model\n",
 252                        device->name);
 253                 goto out;
 254         }
 255
 256         list_add_tail(&device->core_list, &device_list);
 257
 258         device->reg_state = IB_DEV_REGISTERED;
 259
 260         {
 261                 struct ib_client *client;
 262
 263                 list_for_each_entry(client, &client_list, list)
 264                         if (client->add && !add_client_context(device, client))
 265                                 client->add(device);
 266         }
 267
 268  out:
 269         up(&device_sem);
 270         return ret;
 271 }
 272 EXPORT_SYMBOL(ib_register_device);
 273
 274 /**
 275  * ib_unregister_device - Unregister an IB device
 276  * @device:Device to unregister
 277  *
 278  * Unregister an IB device.  All clients will receive a remove callback.
 279  */
 280 void ib_unregister_device(struct ib_device *device)
 281 {
 282         struct ib_client *client;
 283         struct ib_client_data *context, *tmp;
 284         unsigned long flags;
 285
 286         down(&device_sem);
 287
 288         list_for_each_entry_reverse(client, &client_list, list)
 289                 if (client->remove)
 290                         client->remove(device);
 291
 292         list_del(&device->core_list);
 293
 294         up(&device_sem);
 295
 296         spin_lock_irqsave(&device->client_data_lock, flags);
 297         list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
 298                 kfree(context);
 299         spin_unlock_irqrestore(&device->client_data_lock, flags);
 300
 301         device->reg_state = IB_DEV_UNREGISTERED;
 302 }
 303 EXPORT_SYMBOL(ib_unregister_device);
 304
 305 /**
 306  * ib_register_client - Register an IB client
 307  * @client:Client to register
 308  *
 309  * Upper level users of the IB drivers can use ib_register_client() to
 310  * register callbacks for IB device addition and removal.  When an IB
 311  * device is added, each registered client's add method will be called
 312  * (in the order the clients were registered), and when a device is
 313  * removed, each client's remove method will be called (in the reverse
 314  * order that clients were registered).  In addition, when
 315  * ib_register_client() is called, the client will receive an add
 316  * callback for all devices already registered.
 317  */
 318 int ib_register_client(struct ib_client *client)
 319 {
 320         struct ib_device *device;
 321
 322         down(&device_sem);
 323
 324         list_add_tail(&client->list, &client_list);
 325         list_for_each_entry(device, &device_list, core_list)
 326                 if (client->add && !add_client_context(device, client))
 327                         client->add(device);
 328
 329         up(&device_sem);
 330
 331         return 0;
 332 }
 333 EXPORT_SYMBOL(ib_register_client);
 334
 335 /**
 336  * ib_unregister_client - Unregister an IB client
 337  * @client:Client to unregister
 338  *
 339  * Upper level users use ib_unregister_client() to remove their client
 340  * registration.  When ib_unregister_client() is called, the client
 341  * will receive a remove callback for each IB device still registered.
 342  */
 343 void ib_unregister_client(struct ib_client *client)
 344 {
 345         struct ib_client_data *context, *tmp;
 346         struct ib_device *device;
 347         unsigned long flags;
 348
 349         down(&device_sem);
 350
 351         list_for_each_entry(device, &device_list, core_list) {
 352                 if (client->remove)
 353                         client->remove(device);
 354
 355                 spin_lock_irqsave(&device->client_data_lock, flags);
 356                 list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
 357                         if (context->client == client) {
 358                                 list_del(&context->list);
 359                                 kfree(context);
 360                         }
 361                 spin_unlock_irqrestore(&device->client_data_lock, flags);
 362         }
 363         list_del(&client->list);
 364
 365         up(&device_sem);
 366 }
 367 EXPORT_SYMBOL(ib_unregister_client);
 368
 369 /**
 370  * ib_get_client_data - Get IB client context
 371  * @device:Device to get context for
 372  * @client:Client to get context for
 373  *
 374  * ib_get_client_data() returns client context set with
 375  * ib_set_client_data().
 376  */
 377 void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
 378 {
 379         struct ib_client_data *context;
 380         void *ret = NULL;
 381         unsigned long flags;
 382
 383         spin_lock_irqsave(&device->client_data_lock, flags);
 384         list_for_each_entry(context, &device->client_data_list, list)
 385                 if (context->client == client) {
 386                         ret = context->data;
 387                         break;
 388                 }
 389         spin_unlock_irqrestore(&device->client_data_lock, flags);
 390
 391         return ret;
 392 }
 393 EXPORT_SYMBOL(ib_get_client_data);
 394
 395 /**
 396  * ib_set_client_data - Get IB client context
 397  * @device:Device to set context for
 398  * @client:Client to set context for
 399  * @data:Context to set
 400  *
 401  * ib_set_client_data() sets client context that can be retrieved with
 402  * ib_get_client_data().
 403  */
 404 void ib_set_client_data(struct ib_device *device, struct ib_client *client,
 405                         void *data)
 406 {
 407         struct ib_client_data *context;
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&device->client_data_lock, flags);
 411         list_for_each_entry(context, &device->client_data_list, list)
 412                 if (context->client == client) {
 413                         context->data = data;
 414                         goto out;
 415                 }
 416
 417         printk(KERN_WARNING "No client context found for %s/%s\n",
 418                device->name, client->name);
 419
 420 out:
 421         spin_unlock_irqrestore(&device->client_data_lock, flags);
 422 }
 423 EXPORT_SYMBOL(ib_set_client_data);
 424
 425 /**
 426  * ib_register_event_handler - Register an IB event handler
 427  * @event_handler:Handler to register
 428  *
 429  * ib_register_event_handler() registers an event handler that will be
 430  * called back when asynchronous IB events occur (as defined in
 431  * chapter 11 of the InfiniBand Architecture Specification).  This
 432  * callback may occur in interrupt context.
 433  */
 434 int ib_register_event_handler  (struct ib_event_handler *event_handler)
 435 {
 436         unsigned long flags;
 437
 438         spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
 439         list_add_tail(&event_handler->list,
 440                       &event_handler->device->event_handler_list);
 441         spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
 442
 443         return 0;
 444 }
 445 EXPORT_SYMBOL(ib_register_event_handler);
 446
 447 /**
 448  * ib_unregister_event_handler - Unregister an event handler
 449  * @event_handler:Handler to unregister
 450  *
 451  * Unregister an event handler registered with
 452  * ib_register_event_handler().
 453  */
 454 int ib_unregister_event_handler(struct ib_event_handler *event_handler)
 455 {
 456         unsigned long flags;
 457
 458         spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
 459         list_del(&event_handler->list);
 460         spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
 461
 462         return 0;
 463 }
 464 EXPORT_SYMBOL(ib_unregister_event_handler);
 465
 466 /**
 467  * ib_dispatch_event - Dispatch an asynchronous event
 468  * @event:Event to dispatch
 469  *
 470  * Low-level drivers must call ib_dispatch_event() to dispatch the
 471  * event to all registered event handlers when an asynchronous event
 472  * occurs.
 473  */
 474 void ib_dispatch_event(struct ib_event *event)
 475 {
 476         unsigned long flags;
 477         struct ib_event_handler *handler;
 478
 479         spin_lock_irqsave(&event->device->event_handler_lock, flags);
 480
 481         list_for_each_entry(handler, &event->device->event_handler_list, list)
 482                 handler->handler(handler, event);
 483
 484         spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
 485 }
 486 EXPORT_SYMBOL(ib_dispatch_event);
 487
 488 /**
 489  * ib_query_device - Query IB device attributes
 490  * @device:Device to query
 491  * @device_attr:Device attributes
 492  *
 493  * ib_query_device() returns the attributes of a device through the
 494  * @device_attr pointer.
 495  */
 496 int ib_query_device(struct ib_device *device,
 497                     struct ib_device_attr *device_attr)
 498 {
 499         return device->query_device(device, device_attr);
 500 }
 501 EXPORT_SYMBOL(ib_query_device);
 502
 503 /**
 504  * ib_query_port - Query IB port attributes
 505  * @device:Device to query
 506  * @port_num:Port number to query
 507  * @port_attr:Port attributes
 508  *
 509  * ib_query_port() returns the attributes of a port through the
 510  * @port_attr pointer.
 511  */
 512 int ib_query_port(struct ib_device *device,
 513                   u8 port_num,
 514                   struct ib_port_attr *port_attr)
 515 {
 516         return device->query_port(device, port_num, port_attr);
 517 }
 518 EXPORT_SYMBOL(ib_query_port);
 519
 520 /**
 521  * ib_query_gid - Get GID table entry
 522  * @device:Device to query
 523  * @port_num:Port number to query
 524  * @index:GID table index to query
 525  * @gid:Returned GID
 526  *
 527  * ib_query_gid() fetches the specified GID table entry.
 528  */
 529 int ib_query_gid(struct ib_device *device,
 530                  u8 port_num, int index, union ib_gid *gid)
 531 {
 532         return device->query_gid(device, port_num, index, gid);
 533 }
 534 EXPORT_SYMBOL(ib_query_gid);
 535
 536 /**
 537  * ib_query_pkey - Get P_Key table entry
 538  * @device:Device to query
 539  * @port_num:Port number to query
 540  * @index:P_Key table index to query
 541  * @pkey:Returned P_Key
 542  *
 543  * ib_query_pkey() fetches the specified P_Key table entry.
 544  */
 545 int ib_query_pkey(struct ib_device *device,
 546                   u8 port_num, u16 index, u16 *pkey)
 547 {
 548         return device->query_pkey(device, port_num, index, pkey);
 549 }
 550 EXPORT_SYMBOL(ib_query_pkey);
 551
 552 /**
 553  * ib_modify_device - Change IB device attributes
 554  * @device:Device to modify
 555  * @device_modify_mask:Mask of attributes to change
 556  * @device_modify:New attribute values
 557  *
 558  * ib_modify_device() changes a device's attributes as specified by
 559  * the @device_modify_mask and @device_modify structure.
 560  */
 561 int ib_modify_device(struct ib_device *device,
 562                      int device_modify_mask,
 563                      struct ib_device_modify *device_modify)
 564 {
 565         return device->modify_device(device, device_modify_mask,
 566                                      device_modify);
 567 }
 568 EXPORT_SYMBOL(ib_modify_device);
 569
 570 /**
 571  * ib_modify_port - Modifies the attributes for the specified port.
 572  * @device: The device to modify.
 573  * @port_num: The number of the port to modify.
 574  * @port_modify_mask: Mask used to specify which attributes of the port
 575  *   to change.
 576  * @port_modify: New attribute values for the port.
 577  *
 578  * ib_modify_port() changes a port's attributes as specified by the
 579  * @port_modify_mask and @port_modify structure.
 580  */
 581 int ib_modify_port(struct ib_device *device,
 582                    u8 port_num, int port_modify_mask,
 583                    struct ib_port_modify *port_modify)
 584 {
 585         return device->modify_port(device, port_num, port_modify_mask,
 586                                    port_modify);
 587 }
 588 EXPORT_SYMBOL(ib_modify_port);
 589
 590 static int __init ib_core_init(void)
 591 {
 592         int ret;
 593
 594         ret = ib_sysfs_setup();
 595         if (ret)
 596                 printk(KERN_WARNING "Couldn't create InfiniBand device class\n");
 597
 598         ret = ib_cache_setup();
 599         if (ret) {
 600                 printk(KERN_WARNING "Couldn't set up InfiniBand P_Key/GID cache\n");
 601                 ib_sysfs_cleanup();
 602         }
 603
 604         return ret;
 605 }
 606
 607 static void __exit ib_core_cleanup(void)
 608 {
 609         ib_cache_cleanup();
 610         ib_sysfs_cleanup();
 611 }
 612
 613 module_init(ib_core_init);
 614 module_exit(ib_core_cleanup);