source: mainline/uspace/srv/devman/main.c@ a9abe5fc

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a9abe5fc was a9abe5fc, checked in by Jiri Svoboda <jiri@…>, 14 years ago

Suppress various messages.
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1/*
2 * Copyright (c) 2010 Lenka Trochtova
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/**
30 * @defgroup devman Device manager.
31 * @brief HelenOS device manager.
32 * @{
33 */
34
35/** @file
36 */
37
38#include <inttypes.h>
39#include <assert.h>
40#include <ipc/services.h>
41#include <ns.h>
42#include <async.h>
43#include <stdio.h>
44#include <errno.h>
45#include <str_error.h>
46#include <bool.h>
47#include <fibril_synch.h>
48#include <stdlib.h>
49#include <str.h>
50#include <dirent.h>
51#include <fcntl.h>
52#include <sys/stat.h>
53#include <ctype.h>
54#include <io/log.h>
55#include <ipc/devman.h>
56#include <ipc/driver.h>
57#include <thread.h>
58#include <loc.h>
59
60#include "devman.h"
61
62#define DRIVER_DEFAULT_STORE "/drv"
63
64static driver_list_t drivers_list;
65static dev_tree_t device_tree;
66
67static int init_running_drv(void *drv);
68
69/** Register running driver. */
70static driver_t *devman_driver_register(ipc_callid_t callid, ipc_call_t *call)
71{
72 driver_t *driver = NULL;
73 char *drv_name = NULL;
74
75 log_msg(LVL_DEBUG, "devman_driver_register");
76
77 /* Get driver name. */
78 int rc = async_data_write_accept((void **) &drv_name, true, 0, 0, 0, 0);
79 if (rc != EOK) {
80 async_answer_0(callid, rc);
81 return NULL;
82 }
83
84 log_msg(LVL_DEBUG, "The `%s' driver is trying to register.",
85 drv_name);
86
87 /* Find driver structure. */
88 driver = find_driver(&drivers_list, drv_name);
89 if (driver == NULL) {
90 log_msg(LVL_ERROR, "No driver named `%s' was found.", drv_name);
91 free(drv_name);
92 drv_name = NULL;
93 async_answer_0(callid, ENOENT);
94 return NULL;
95 }
96
97 free(drv_name);
98 drv_name = NULL;
99
100 fibril_mutex_lock(&driver->driver_mutex);
101
102 if (driver->sess) {
103 /* We already have a connection to the driver. */
104 log_msg(LVL_ERROR, "Driver '%s' already started.\n",
105 driver->name);
106 fibril_mutex_unlock(&driver->driver_mutex);
107 async_answer_0(callid, EEXISTS);
108 return NULL;
109 }
110
111 switch (driver->state) {
112 case DRIVER_NOT_STARTED:
113 /* Somebody started the driver manually. */
114 log_msg(LVL_NOTE, "Driver '%s' started manually.\n",
115 driver->name);
116 driver->state = DRIVER_STARTING;
117 break;
118 case DRIVER_STARTING:
119 /* The expected case */
120 break;
121 case DRIVER_RUNNING:
122 /* Should not happen since we do not have a connected session */
123 assert(false);
124 }
125
126 /* Create connection to the driver. */
127 log_msg(LVL_DEBUG, "Creating connection to the `%s' driver.",
128 driver->name);
129 driver->sess = async_callback_receive(EXCHANGE_PARALLEL);
130 if (!driver->sess) {
131 fibril_mutex_unlock(&driver->driver_mutex);
132 async_answer_0(callid, ENOTSUP);
133 return NULL;
134 }
135 /* FIXME: Work around problem with callback sessions */
136 async_sess_args_set(driver->sess, DRIVER_DEVMAN, 0, 0);
137
138 log_msg(LVL_NOTE,
139 "The `%s' driver was successfully registered as running.",
140 driver->name);
141
142 /*
143 * Initialize the driver as running (e.g. pass assigned devices to it)
144 * in a separate fibril; the separate fibril is used to enable the
145 * driver to use devman service during the driver's initialization.
146 */
147 fid_t fid = fibril_create(init_running_drv, driver);
148 if (fid == 0) {
149 log_msg(LVL_ERROR, "Failed to create initialization fibril " \
150 "for driver `%s'.", driver->name);
151 fibril_mutex_unlock(&driver->driver_mutex);
152 async_answer_0(callid, ENOMEM);
153 return NULL;
154 }
155
156 fibril_add_ready(fid);
157 fibril_mutex_unlock(&driver->driver_mutex);
158
159 async_answer_0(callid, EOK);
160 return driver;
161}
162
163/** Receive device match ID from the device's parent driver and add it to the
164 * list of devices match ids.
165 *
166 * @param match_ids The list of the device's match ids.
167 * @return Zero on success, negative error code otherwise.
168 */
169static int devman_receive_match_id(match_id_list_t *match_ids)
170{
171 match_id_t *match_id = create_match_id();
172 ipc_callid_t callid;
173 ipc_call_t call;
174 int rc = 0;
175
176 callid = async_get_call(&call);
177 if (DEVMAN_ADD_MATCH_ID != IPC_GET_IMETHOD(call)) {
178 log_msg(LVL_ERROR,
179 "Invalid protocol when trying to receive match id.");
180 async_answer_0(callid, EINVAL);
181 delete_match_id(match_id);
182 return EINVAL;
183 }
184
185 if (match_id == NULL) {
186 log_msg(LVL_ERROR, "Failed to allocate match id.");
187 async_answer_0(callid, ENOMEM);
188 return ENOMEM;
189 }
190
191 async_answer_0(callid, EOK);
192
193 match_id->score = IPC_GET_ARG1(call);
194
195 char *match_id_str;
196 rc = async_data_write_accept((void **) &match_id_str, true, 0, 0, 0, 0);
197 match_id->id = match_id_str;
198 if (rc != EOK) {
199 delete_match_id(match_id);
200 log_msg(LVL_ERROR, "Failed to receive match id string: %s.",
201 str_error(rc));
202 return rc;
203 }
204
205 list_append(&match_id->link, &match_ids->ids);
206
207 log_msg(LVL_DEBUG, "Received match id `%s', score %d.",
208 match_id->id, match_id->score);
209 return rc;
210}
211
212/** Receive device match IDs from the device's parent driver and add them to the
213 * list of devices match ids.
214 *
215 * @param match_count The number of device's match ids to be received.
216 * @param match_ids The list of the device's match ids.
217 * @return Zero on success, negative error code otherwise.
218 */
219static int devman_receive_match_ids(sysarg_t match_count,
220 match_id_list_t *match_ids)
221{
222 int ret = EOK;
223 size_t i;
224
225 for (i = 0; i < match_count; i++) {
226 if (EOK != (ret = devman_receive_match_id(match_ids)))
227 return ret;
228 }
229 return ret;
230}
231
232static int assign_driver_fibril(void *arg)
233{
234 dev_node_t *dev_node = (dev_node_t *) arg;
235 assign_driver(dev_node, &drivers_list, &device_tree);
236
237 /* Delete one reference we got from the caller. */
238 dev_del_ref(dev_node);
239 return EOK;
240}
241
242static int online_function(fun_node_t *fun)
243{
244 dev_node_t *dev;
245
246 fibril_rwlock_write_lock(&device_tree.rwlock);
247
248 if (fun->state == FUN_ON_LINE) {
249 fibril_rwlock_write_unlock(&device_tree.rwlock);
250 log_msg(LVL_WARN, "Function %s is already on line.",
251 fun->pathname);
252 return EOK;
253 }
254
255 if (fun->ftype == fun_inner) {
256 dev = create_dev_node();
257 if (dev == NULL) {
258 fibril_rwlock_write_unlock(&device_tree.rwlock);
259 return ENOMEM;
260 }
261
262 insert_dev_node(&device_tree, dev, fun);
263 dev_add_ref(dev);
264 }
265
266 log_msg(LVL_DEBUG, "devman_add_function(fun=\"%s\")", fun->pathname);
267
268 if (fun->ftype == fun_inner) {
269 dev = fun->child;
270 assert(dev != NULL);
271
272 /* Give one reference over to assign_driver_fibril(). */
273 dev_add_ref(dev);
274 /*
275 * Try to find a suitable driver and assign it to the device. We do
276 * not want to block the current fibril that is used for processing
277 * incoming calls: we will launch a separate fibril to handle the
278 * driver assigning. That is because assign_driver can actually include
279 * task spawning which could take some time.
280 */
281 fid_t assign_fibril = fibril_create(assign_driver_fibril, dev);
282 if (assign_fibril == 0) {
283 log_msg(LVL_ERROR, "Failed to create fibril for "
284 "assigning driver.");
285 /* XXX Cleanup */
286 fibril_rwlock_write_unlock(&device_tree.rwlock);
287 return ENOMEM;
288 }
289 fibril_add_ready(assign_fibril);
290 } else {
291 loc_register_tree_function(fun, &device_tree);
292 }
293
294 fibril_rwlock_write_unlock(&device_tree.rwlock);
295
296 return EOK;
297}
298
299static int offline_function(fun_node_t *fun)
300{
301 int rc;
302
303 fibril_rwlock_write_lock(&device_tree.rwlock);
304
305 if (fun->state == FUN_OFF_LINE) {
306 fibril_rwlock_write_unlock(&device_tree.rwlock);
307 log_msg(LVL_WARN, "Function %s is already off line.",
308 fun->pathname);
309 return EOK;
310 }
311
312 if (fun->ftype == fun_inner) {
313 log_msg(LVL_DEBUG, "Offlining inner function %s.",
314 fun->pathname);
315
316 if (fun->child != NULL) {
317 dev_node_t *dev = fun->child;
318
319 dev_add_ref(dev);
320 fibril_rwlock_write_unlock(&device_tree.rwlock);
321
322 /* If device is owned by driver, ask driver to give it up. */
323 if (dev->state == DEVICE_USABLE) {
324 rc = driver_dev_remove(&device_tree, dev);
325 if (rc != EOK) {
326 dev_del_ref(dev);
327 return ENOTSUP;
328 }
329 }
330
331 /* Verify that driver removed all functions */
332 fibril_rwlock_read_lock(&device_tree.rwlock);
333 if (!list_empty(&dev->functions)) {
334 fibril_rwlock_read_unlock(&device_tree.rwlock);
335 return EIO;
336 }
337 driver_t *driver = dev->drv;
338 fibril_rwlock_read_unlock(&device_tree.rwlock);
339
340 if (driver)
341 detach_driver(&device_tree, dev);
342
343 fibril_rwlock_write_lock(&device_tree.rwlock);
344 remove_dev_node(&device_tree, dev);
345
346 /* Delete ref created when node was inserted */
347 dev_del_ref(dev);
348 /* Delete ref created by dev_add_ref(dev) above */
349 dev_del_ref(dev);
350 }
351 } else {
352 /* Unregister from location service */
353 rc = loc_service_unregister(fun->service_id);
354 if (rc != EOK) {
355 fibril_rwlock_write_unlock(&device_tree.rwlock);
356 log_msg(LVL_ERROR, "Failed unregistering tree service.");
357 return EIO;
358 }
359
360 fun->service_id = 0;
361 }
362
363 fun->state = FUN_OFF_LINE;
364 fibril_rwlock_write_unlock(&device_tree.rwlock);
365
366 return EOK;
367}
368
369/** Handle function registration.
370 *
371 * Child devices are registered by their parent's device driver.
372 */
373static void devman_add_function(ipc_callid_t callid, ipc_call_t *call)
374{
375 fun_type_t ftype = (fun_type_t) IPC_GET_ARG1(*call);
376 devman_handle_t dev_handle = IPC_GET_ARG2(*call);
377 sysarg_t match_count = IPC_GET_ARG3(*call);
378 dev_tree_t *tree = &device_tree;
379
380 dev_node_t *pdev = find_dev_node(&device_tree, dev_handle);
381 if (pdev == NULL) {
382 async_answer_0(callid, ENOENT);
383 return;
384 }
385
386 if (ftype != fun_inner && ftype != fun_exposed) {
387 /* Unknown function type */
388 log_msg(LVL_ERROR,
389 "Unknown function type %d provided by driver.",
390 (int) ftype);
391
392 dev_del_ref(pdev);
393 async_answer_0(callid, EINVAL);
394 return;
395 }
396
397 char *fun_name = NULL;
398 int rc = async_data_write_accept((void **)&fun_name, true, 0, 0, 0, 0);
399 if (rc != EOK) {
400 dev_del_ref(pdev);
401 async_answer_0(callid, rc);
402 return;
403 }
404
405 fibril_rwlock_write_lock(&tree->rwlock);
406
407 /* Check device state */
408 if (pdev->state == DEVICE_REMOVED) {
409 fibril_rwlock_write_unlock(&tree->rwlock);
410 dev_del_ref(pdev);
411 async_answer_0(callid, ENOENT);
412 return;
413 }
414
415 /* Check that function with same name is not there already. */
416 if (find_fun_node_in_device(tree, pdev, fun_name) != NULL) {
417 fibril_rwlock_write_unlock(&tree->rwlock);
418 dev_del_ref(pdev);
419 async_answer_0(callid, EEXISTS);
420 printf(NAME ": Warning, driver tried to register `%s' twice.\n",
421 fun_name);
422 free(fun_name);
423 return;
424 }
425
426 fun_node_t *fun = create_fun_node();
427 fun_add_ref(fun);
428 fun->ftype = ftype;
429
430 if (!insert_fun_node(&device_tree, fun, fun_name, pdev)) {
431 fibril_rwlock_write_unlock(&tree->rwlock);
432 dev_del_ref(pdev);
433 delete_fun_node(fun);
434 async_answer_0(callid, ENOMEM);
435 return;
436 }
437
438 fibril_rwlock_write_unlock(&tree->rwlock);
439 dev_del_ref(pdev);
440
441 devman_receive_match_ids(match_count, &fun->match_ids);
442
443 rc = online_function(fun);
444 if (rc != EOK) {
445 /* XXX clean up */
446 async_answer_0(callid, rc);
447 return;
448 }
449
450 /* Return device handle to parent's driver. */
451 async_answer_1(callid, EOK, fun->handle);
452}
453
454static void devman_add_function_to_cat(ipc_callid_t callid, ipc_call_t *call)
455{
456 devman_handle_t handle = IPC_GET_ARG1(*call);
457 category_id_t cat_id;
458 int rc;
459
460 /* Get category name. */
461 char *cat_name;
462 rc = async_data_write_accept((void **) &cat_name, true,
463 0, 0, 0, 0);
464 if (rc != EOK) {
465 async_answer_0(callid, rc);
466 return;
467 }
468
469 fun_node_t *fun = find_fun_node(&device_tree, handle);
470 if (fun == NULL) {
471 async_answer_0(callid, ENOENT);
472 return;
473 }
474
475 fibril_rwlock_read_lock(&device_tree.rwlock);
476
477 /* Check function state */
478 if (fun->state == FUN_REMOVED) {
479 fibril_rwlock_read_unlock(&device_tree.rwlock);
480 async_answer_0(callid, ENOENT);
481 return;
482 }
483
484 rc = loc_category_get_id(cat_name, &cat_id, IPC_FLAG_BLOCKING);
485 if (rc == EOK) {
486 loc_service_add_to_cat(fun->service_id, cat_id);
487 } else {
488 log_msg(LVL_ERROR, "Failed adding function `%s' to category "
489 "`%s'.", fun->pathname, cat_name);
490 }
491
492 log_msg(LVL_NOTE, "Function `%s' added to category `%s'.",
493 fun->pathname, cat_name);
494
495 fibril_rwlock_read_unlock(&device_tree.rwlock);
496 fun_del_ref(fun);
497
498 async_answer_0(callid, EOK);
499}
500
501/** Online function by driver request.
502 *
503 */
504static void devman_drv_fun_online(ipc_callid_t iid, ipc_call_t *icall,
505 driver_t *drv)
506{
507 fun_node_t *fun;
508 int rc;
509
510 log_msg(LVL_DEBUG, "devman_drv_fun_online()");
511
512 fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
513 if (fun == NULL) {
514 async_answer_0(iid, ENOENT);
515 return;
516 }
517
518 fibril_rwlock_read_lock(&device_tree.rwlock);
519 if (fun->dev == NULL || fun->dev->drv != drv) {
520 fibril_rwlock_read_unlock(&device_tree.rwlock);
521 fun_del_ref(fun);
522 async_answer_0(iid, ENOENT);
523 return;
524 }
525 fibril_rwlock_read_unlock(&device_tree.rwlock);
526
527 rc = online_function(fun);
528 if (rc != EOK) {
529 fun_del_ref(fun);
530 async_answer_0(iid, (sysarg_t) rc);
531 return;
532 }
533
534 fun_del_ref(fun);
535
536 async_answer_0(iid, (sysarg_t) EOK);
537}
538
539
540/** Offline function by driver request.
541 *
542 */
543static void devman_drv_fun_offline(ipc_callid_t iid, ipc_call_t *icall,
544 driver_t *drv)
545{
546 fun_node_t *fun;
547 int rc;
548
549 fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
550 if (fun == NULL) {
551 async_answer_0(iid, ENOENT);
552 return;
553 }
554
555 fibril_rwlock_write_lock(&device_tree.rwlock);
556 if (fun->dev == NULL || fun->dev->drv != drv) {
557 fun_del_ref(fun);
558 async_answer_0(iid, ENOENT);
559 return;
560 }
561 fibril_rwlock_write_unlock(&device_tree.rwlock);
562
563 rc = offline_function(fun);
564 if (rc != EOK) {
565 fun_del_ref(fun);
566 async_answer_0(iid, (sysarg_t) rc);
567 return;
568 }
569
570 fun_del_ref(fun);
571 async_answer_0(iid, (sysarg_t) EOK);
572}
573
574/** Remove function. */
575static void devman_remove_function(ipc_callid_t callid, ipc_call_t *call)
576{
577 devman_handle_t fun_handle = IPC_GET_ARG1(*call);
578 dev_tree_t *tree = &device_tree;
579 int rc;
580
581
582 fun_node_t *fun = find_fun_node(&device_tree, fun_handle);
583 if (fun == NULL) {
584 async_answer_0(callid, ENOENT);
585 return;
586 }
587
588 fibril_rwlock_write_lock(&tree->rwlock);
589
590 log_msg(LVL_DEBUG, "devman_remove_function(fun='%s')", fun->pathname);
591
592 /* Check function state */
593 if (fun->state == FUN_REMOVED) {
594 fibril_rwlock_write_unlock(&tree->rwlock);
595 async_answer_0(callid, ENOENT);
596 return;
597 }
598
599 if (fun->ftype == fun_inner) {
600 /* Handle possible descendants */
601 /* TODO - This is a surprise removal */
602 if (fun->child != NULL) {
603 log_msg(LVL_WARN, "devman_remove_function(): not handling "
604 "descendants\n");
605 }
606 } else {
607 if (fun->service_id != 0) {
608 /* Unregister from location service */
609 rc = loc_service_unregister(fun->service_id);
610 if (rc != EOK) {
611 log_msg(LVL_ERROR, "Failed unregistering tree "
612 "service.");
613 fibril_rwlock_write_unlock(&tree->rwlock);
614 fun_del_ref(fun);
615 async_answer_0(callid, EIO);
616 return;
617 }
618 }
619 }
620
621 remove_fun_node(&device_tree, fun);
622 fibril_rwlock_write_unlock(&tree->rwlock);
623
624 /* Delete ref added when inserting function into tree */
625 fun_del_ref(fun);
626 /* Delete ref added above when looking up function */
627 fun_del_ref(fun);
628
629 log_msg(LVL_DEBUG, "devman_remove_function() succeeded.");
630 async_answer_0(callid, EOK);
631}
632
633/** Initialize driver which has registered itself as running and ready.
634 *
635 * The initialization is done in a separate fibril to avoid deadlocks (if the
636 * driver needed to be served by devman during the driver's initialization).
637 */
638static int init_running_drv(void *drv)
639{
640 driver_t *driver = (driver_t *) drv;
641
642 initialize_running_driver(driver, &device_tree);
643 log_msg(LVL_DEBUG, "The `%s` driver was successfully initialized.",
644 driver->name);
645 return 0;
646}
647
648/** Function for handling connections from a driver to the device manager. */
649static void devman_connection_driver(ipc_callid_t iid, ipc_call_t *icall)
650{
651 client_t *client;
652 driver_t *driver;
653
654 /* Accept the connection. */
655 async_answer_0(iid, EOK);
656
657 client = async_get_client_data();
658 if (client == NULL) {
659 log_msg(LVL_ERROR, "Failed to allocate client data.");
660 return;
661 }
662
663 while (true) {
664 ipc_call_t call;
665 ipc_callid_t callid = async_get_call(&call);
666
667 if (!IPC_GET_IMETHOD(call))
668 break;
669
670 if (IPC_GET_IMETHOD(call) != DEVMAN_DRIVER_REGISTER) {
671 fibril_mutex_lock(&client->mutex);
672 driver = client->driver;
673 fibril_mutex_unlock(&client->mutex);
674 if (driver == NULL) {
675 /* First call must be to DEVMAN_DRIVER_REGISTER */
676 async_answer_0(callid, ENOTSUP);
677 continue;
678 }
679 }
680
681 switch (IPC_GET_IMETHOD(call)) {
682 case DEVMAN_DRIVER_REGISTER:
683 fibril_mutex_lock(&client->mutex);
684 if (client->driver != NULL) {
685 fibril_mutex_unlock(&client->mutex);
686 async_answer_0(callid, EINVAL);
687 continue;
688 }
689 client->driver = devman_driver_register(callid, &call);
690 fibril_mutex_unlock(&client->mutex);
691 break;
692 case DEVMAN_ADD_FUNCTION:
693 devman_add_function(callid, &call);
694 break;
695 case DEVMAN_ADD_DEVICE_TO_CATEGORY:
696 devman_add_function_to_cat(callid, &call);
697 break;
698 case DEVMAN_DRV_FUN_ONLINE:
699 devman_drv_fun_online(callid, &call, driver);
700 break;
701 case DEVMAN_DRV_FUN_OFFLINE:
702 devman_drv_fun_offline(callid, &call, driver);
703 break;
704 case DEVMAN_REMOVE_FUNCTION:
705 devman_remove_function(callid, &call);
706 break;
707 default:
708 async_answer_0(callid, EINVAL);
709 break;
710 }
711 }
712}
713
714/** Find handle for the device instance identified by the device's path in the
715 * device tree. */
716static void devman_function_get_handle(ipc_callid_t iid, ipc_call_t *icall)
717{
718 char *pathname;
719 devman_handle_t handle;
720
721 int rc = async_data_write_accept((void **) &pathname, true, 0, 0, 0, 0);
722 if (rc != EOK) {
723 async_answer_0(iid, rc);
724 return;
725 }
726
727 fun_node_t *fun = find_fun_node_by_path(&device_tree, pathname);
728
729 free(pathname);
730
731 if (fun == NULL) {
732 async_answer_0(iid, ENOENT);
733 return;
734 }
735
736 fibril_rwlock_read_lock(&device_tree.rwlock);
737
738 /* Check function state */
739 if (fun->state == FUN_REMOVED) {
740 fibril_rwlock_read_unlock(&device_tree.rwlock);
741 async_answer_0(iid, ENOENT);
742 return;
743 }
744 handle = fun->handle;
745
746 fibril_rwlock_read_unlock(&device_tree.rwlock);
747
748 /* Delete reference created above by find_fun_node_by_path() */
749 fun_del_ref(fun);
750
751 async_answer_1(iid, EOK, handle);
752}
753
754/** Get device name. */
755static void devman_fun_get_name(ipc_callid_t iid, ipc_call_t *icall)
756{
757 devman_handle_t handle = IPC_GET_ARG1(*icall);
758
759 fun_node_t *fun = find_fun_node(&device_tree, handle);
760 if (fun == NULL) {
761 async_answer_0(iid, ENOMEM);
762 return;
763 }
764
765 ipc_callid_t data_callid;
766 size_t data_len;
767 if (!async_data_read_receive(&data_callid, &data_len)) {
768 async_answer_0(iid, EINVAL);
769 fun_del_ref(fun);
770 return;
771 }
772
773 void *buffer = malloc(data_len);
774 if (buffer == NULL) {
775 async_answer_0(data_callid, ENOMEM);
776 async_answer_0(iid, ENOMEM);
777 fun_del_ref(fun);
778 return;
779 }
780
781 fibril_rwlock_read_lock(&device_tree.rwlock);
782
783 /* Check function state */
784 if (fun->state == FUN_REMOVED) {
785 fibril_rwlock_read_unlock(&device_tree.rwlock);
786 free(buffer);
787
788 async_answer_0(data_callid, ENOENT);
789 async_answer_0(iid, ENOENT);
790 fun_del_ref(fun);
791 return;
792 }
793
794 size_t sent_length = str_size(fun->name);
795 if (sent_length > data_len) {
796 sent_length = data_len;
797 }
798
799 async_data_read_finalize(data_callid, fun->name, sent_length);
800 async_answer_0(iid, EOK);
801
802 fibril_rwlock_read_unlock(&device_tree.rwlock);
803 fun_del_ref(fun);
804 free(buffer);
805}
806
807
808/** Get device path. */
809static void devman_fun_get_path(ipc_callid_t iid, ipc_call_t *icall)
810{
811 devman_handle_t handle = IPC_GET_ARG1(*icall);
812
813 fun_node_t *fun = find_fun_node(&device_tree, handle);
814 if (fun == NULL) {
815 async_answer_0(iid, ENOMEM);
816 return;
817 }
818
819 ipc_callid_t data_callid;
820 size_t data_len;
821 if (!async_data_read_receive(&data_callid, &data_len)) {
822 async_answer_0(iid, EINVAL);
823 fun_del_ref(fun);
824 return;
825 }
826
827 void *buffer = malloc(data_len);
828 if (buffer == NULL) {
829 async_answer_0(data_callid, ENOMEM);
830 async_answer_0(iid, ENOMEM);
831 fun_del_ref(fun);
832 return;
833 }
834
835 fibril_rwlock_read_lock(&device_tree.rwlock);
836
837 /* Check function state */
838 if (fun->state == FUN_REMOVED) {
839 fibril_rwlock_read_unlock(&device_tree.rwlock);
840 free(buffer);
841
842 async_answer_0(data_callid, ENOENT);
843 async_answer_0(iid, ENOENT);
844 fun_del_ref(fun);
845 return;
846 }
847
848 size_t sent_length = str_size(fun->pathname);
849 if (sent_length > data_len) {
850 sent_length = data_len;
851 }
852
853 async_data_read_finalize(data_callid, fun->pathname, sent_length);
854 async_answer_0(iid, EOK);
855
856 fibril_rwlock_read_unlock(&device_tree.rwlock);
857 fun_del_ref(fun);
858 free(buffer);
859}
860
861static void devman_dev_get_functions(ipc_callid_t iid, ipc_call_t *icall)
862{
863 ipc_callid_t callid;
864 size_t size;
865 size_t act_size;
866 int rc;
867
868 if (!async_data_read_receive(&callid, &size)) {
869 async_answer_0(callid, EREFUSED);
870 async_answer_0(iid, EREFUSED);
871 return;
872 }
873
874 fibril_rwlock_read_lock(&device_tree.rwlock);
875
876 dev_node_t *dev = find_dev_node_no_lock(&device_tree,
877 IPC_GET_ARG1(*icall));
878 if (dev == NULL || dev->state == DEVICE_REMOVED) {
879 fibril_rwlock_read_unlock(&device_tree.rwlock);
880 async_answer_0(callid, ENOENT);
881 async_answer_0(iid, ENOENT);
882 return;
883 }
884
885 devman_handle_t *hdl_buf = (devman_handle_t *) malloc(size);
886 if (hdl_buf == NULL) {
887 fibril_rwlock_read_unlock(&device_tree.rwlock);
888 async_answer_0(callid, ENOMEM);
889 async_answer_0(iid, ENOMEM);
890 return;
891 }
892
893 rc = dev_get_functions(&device_tree, dev, hdl_buf, size, &act_size);
894 if (rc != EOK) {
895 fibril_rwlock_read_unlock(&device_tree.rwlock);
896 async_answer_0(callid, rc);
897 async_answer_0(iid, rc);
898 return;
899 }
900
901 fibril_rwlock_read_unlock(&device_tree.rwlock);
902
903 sysarg_t retval = async_data_read_finalize(callid, hdl_buf, size);
904 free(hdl_buf);
905
906 async_answer_1(iid, retval, act_size);
907}
908
909
910/** Get handle for child device of a function. */
911static void devman_fun_get_child(ipc_callid_t iid, ipc_call_t *icall)
912{
913 fun_node_t *fun;
914
915 fibril_rwlock_read_lock(&device_tree.rwlock);
916
917 fun = find_fun_node_no_lock(&device_tree, IPC_GET_ARG1(*icall));
918 if (fun == NULL || fun->state == FUN_REMOVED) {
919 fibril_rwlock_read_unlock(&device_tree.rwlock);
920 async_answer_0(iid, ENOENT);
921 return;
922 }
923
924 if (fun->child == NULL) {
925 fibril_rwlock_read_unlock(&device_tree.rwlock);
926 async_answer_0(iid, ENOENT);
927 return;
928 }
929
930 async_answer_1(iid, EOK, fun->child->handle);
931
932 fibril_rwlock_read_unlock(&device_tree.rwlock);
933}
934
935/** Online function.
936 *
937 * Send a request to online a function to the responsible driver.
938 * The driver may offline other functions if necessary (i.e. if the state
939 * of this function is linked to state of another function somehow).
940 */
941static void devman_fun_online(ipc_callid_t iid, ipc_call_t *icall)
942{
943 fun_node_t *fun;
944 int rc;
945
946 fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
947 if (fun == NULL) {
948 async_answer_0(iid, ENOENT);
949 return;
950 }
951
952 rc = driver_fun_online(&device_tree, fun);
953 fun_del_ref(fun);
954
955 async_answer_0(iid, (sysarg_t) rc);
956}
957
958/** Offline function.
959 *
960 * Send a request to offline a function to the responsible driver. As
961 * a result the subtree rooted at that function should be cleanly
962 * detatched. The driver may offline other functions if necessary
963 * (i.e. if the state of this function is linked to state of another
964 * function somehow).
965 */
966static void devman_fun_offline(ipc_callid_t iid, ipc_call_t *icall)
967{
968 fun_node_t *fun;
969 int rc;
970
971 fun = find_fun_node(&device_tree, IPC_GET_ARG1(*icall));
972 if (fun == NULL) {
973 async_answer_0(iid, ENOENT);
974 return;
975 }
976
977 rc = driver_fun_offline(&device_tree, fun);
978 fun_del_ref(fun);
979
980 async_answer_0(iid, (sysarg_t) rc);
981}
982
983/** Find handle for the function instance identified by its service ID. */
984static void devman_fun_sid_to_handle(ipc_callid_t iid, ipc_call_t *icall)
985{
986 fun_node_t *fun;
987
988 fun = find_loc_tree_function(&device_tree, IPC_GET_ARG1(*icall));
989
990 if (fun == NULL) {
991 async_answer_0(iid, ENOENT);
992 return;
993 }
994
995 fibril_rwlock_read_lock(&device_tree.rwlock);
996
997 /* Check function state */
998 if (fun->state == FUN_REMOVED) {
999 fibril_rwlock_read_unlock(&device_tree.rwlock);
1000 async_answer_0(iid, ENOENT);
1001 return;
1002 }
1003
1004 async_answer_1(iid, EOK, fun->handle);
1005 fibril_rwlock_read_unlock(&device_tree.rwlock);
1006 fun_del_ref(fun);
1007}
1008
1009/** Function for handling connections from a client to the device manager. */
1010static void devman_connection_client(ipc_callid_t iid, ipc_call_t *icall)
1011{
1012 /* Accept connection. */
1013 async_answer_0(iid, EOK);
1014
1015 while (true) {
1016 ipc_call_t call;
1017 ipc_callid_t callid = async_get_call(&call);
1018
1019 if (!IPC_GET_IMETHOD(call))
1020 break;
1021
1022 switch (IPC_GET_IMETHOD(call)) {
1023 case DEVMAN_DEVICE_GET_HANDLE:
1024 devman_function_get_handle(callid, &call);
1025 break;
1026 case DEVMAN_DEV_GET_FUNCTIONS:
1027 devman_dev_get_functions(callid, &call);
1028 break;
1029 case DEVMAN_FUN_GET_CHILD:
1030 devman_fun_get_child(callid, &call);
1031 break;
1032 case DEVMAN_FUN_GET_NAME:
1033 devman_fun_get_name(callid, &call);
1034 break;
1035 case DEVMAN_FUN_GET_PATH:
1036 devman_fun_get_path(callid, &call);
1037 break;
1038 case DEVMAN_FUN_ONLINE:
1039 devman_fun_online(callid, &call);
1040 break;
1041 case DEVMAN_FUN_OFFLINE:
1042 devman_fun_offline(callid, &call);
1043 break;
1044 case DEVMAN_FUN_SID_TO_HANDLE:
1045 devman_fun_sid_to_handle(callid, &call);
1046 break;
1047 default:
1048 async_answer_0(callid, ENOENT);
1049 }
1050 }
1051}
1052
1053static void devman_forward(ipc_callid_t iid, ipc_call_t *icall,
1054 bool drv_to_parent)
1055{
1056 devman_handle_t handle = IPC_GET_ARG2(*icall);
1057 devman_handle_t fwd_h;
1058 fun_node_t *fun = NULL;
1059 dev_node_t *dev = NULL;
1060
1061 fun = find_fun_node(&device_tree, handle);
1062 if (fun == NULL)
1063 dev = find_dev_node(&device_tree, handle);
1064 else {
1065 fibril_rwlock_read_lock(&device_tree.rwlock);
1066 dev = fun->dev;
1067 if (dev != NULL)
1068 dev_add_ref(dev);
1069 fibril_rwlock_read_unlock(&device_tree.rwlock);
1070 }
1071
1072 /*
1073 * For a valid function to connect to we need a device. The root
1074 * function, for example, has no device and cannot be connected to.
1075 * This means @c dev needs to be valid regardless whether we are
1076 * connecting to a device or to a function.
1077 */
1078 if (dev == NULL) {
1079 log_msg(LVL_ERROR, "IPC forwarding failed - no device or "
1080 "function with handle %" PRIun " was found.", handle);
1081 async_answer_0(iid, ENOENT);
1082 goto cleanup;
1083 }
1084
1085 if (fun == NULL && !drv_to_parent) {
1086 log_msg(LVL_ERROR, NAME ": devman_forward error - cannot "
1087 "connect to handle %" PRIun ", refers to a device.",
1088 handle);
1089 async_answer_0(iid, ENOENT);
1090 goto cleanup;
1091 }
1092
1093 driver_t *driver = NULL;
1094
1095 fibril_rwlock_read_lock(&device_tree.rwlock);
1096
1097 if (drv_to_parent) {
1098 /* Connect to parent function of a device (or device function). */
1099 if (dev->pfun->dev != NULL)
1100 driver = dev->pfun->dev->drv;
1101 fwd_h = dev->pfun->handle;
1102 } else if (dev->state == DEVICE_USABLE) {
1103 /* Connect to the specified function */
1104 driver = dev->drv;
1105 assert(driver != NULL);
1106
1107 fwd_h = handle;
1108 }
1109
1110 fibril_rwlock_read_unlock(&device_tree.rwlock);
1111
1112 if (driver == NULL) {
1113 log_msg(LVL_ERROR, "IPC forwarding refused - " \
1114 "the device %" PRIun " is not in usable state.", handle);
1115 async_answer_0(iid, ENOENT);
1116 goto cleanup;
1117 }
1118
1119 int method;
1120 if (drv_to_parent)
1121 method = DRIVER_DRIVER;
1122 else
1123 method = DRIVER_CLIENT;
1124
1125 if (!driver->sess) {
1126 log_msg(LVL_ERROR,
1127 "Could not forward to driver `%s'.", driver->name);
1128 async_answer_0(iid, EINVAL);
1129 goto cleanup;
1130 }
1131
1132 if (fun != NULL) {
1133 log_msg(LVL_DEBUG,
1134 "Forwarding request for `%s' function to driver `%s'.",
1135 fun->pathname, driver->name);
1136 } else {
1137 log_msg(LVL_DEBUG,
1138 "Forwarding request for `%s' device to driver `%s'.",
1139 dev->pfun->pathname, driver->name);
1140 }
1141
1142 async_exch_t *exch = async_exchange_begin(driver->sess);
1143 async_forward_fast(iid, exch, method, fwd_h, 0, IPC_FF_NONE);
1144 async_exchange_end(exch);
1145
1146cleanup:
1147 if (dev != NULL)
1148 dev_del_ref(dev);
1149 if (fun != NULL)
1150 fun_del_ref(fun);
1151}
1152
1153/** Function for handling connections from a client forwarded by the location
1154 * service to the device manager. */
1155static void devman_connection_loc(ipc_callid_t iid, ipc_call_t *icall)
1156{
1157 service_id_t service_id = IPC_GET_ARG2(*icall);
1158 fun_node_t *fun;
1159 dev_node_t *dev;
1160 devman_handle_t handle;
1161 driver_t *driver;
1162
1163 fun = find_loc_tree_function(&device_tree, service_id);
1164
1165 fibril_rwlock_read_lock(&device_tree.rwlock);
1166
1167 if (fun == NULL || fun->dev == NULL || fun->dev->drv == NULL) {
1168 log_msg(LVL_WARN, "devman_connection_loc(): function "
1169 "not found.\n");
1170 fibril_rwlock_read_unlock(&device_tree.rwlock);
1171 async_answer_0(iid, ENOENT);
1172 return;
1173 }
1174
1175 dev = fun->dev;
1176 driver = dev->drv;
1177 handle = fun->handle;
1178
1179 fibril_rwlock_read_unlock(&device_tree.rwlock);
1180
1181 async_exch_t *exch = async_exchange_begin(driver->sess);
1182 async_forward_fast(iid, exch, DRIVER_CLIENT, handle, 0,
1183 IPC_FF_NONE);
1184 async_exchange_end(exch);
1185
1186 log_msg(LVL_DEBUG,
1187 "Forwarding loc service request for `%s' function to driver `%s'.",
1188 fun->pathname, driver->name);
1189
1190 fun_del_ref(fun);
1191}
1192
1193/** Function for handling connections to device manager. */
1194static void devman_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
1195{
1196 /* Select port. */
1197 switch ((sysarg_t) (IPC_GET_ARG1(*icall))) {
1198 case DEVMAN_DRIVER:
1199 devman_connection_driver(iid, icall);
1200 break;
1201 case DEVMAN_CLIENT:
1202 devman_connection_client(iid, icall);
1203 break;
1204 case DEVMAN_CONNECT_TO_DEVICE:
1205 /* Connect client to selected device. */
1206 devman_forward(iid, icall, false);
1207 break;
1208 case DEVMAN_CONNECT_FROM_LOC:
1209 /* Someone connected through loc node. */
1210 devman_connection_loc(iid, icall);
1211 break;
1212 case DEVMAN_CONNECT_TO_PARENTS_DEVICE:
1213 /* Connect client to selected device. */
1214 devman_forward(iid, icall, true);
1215 break;
1216 default:
1217 /* No such interface */
1218 async_answer_0(iid, ENOENT);
1219 }
1220}
1221
1222static void *devman_client_data_create(void)
1223{
1224 client_t *client;
1225
1226 client = calloc(1, sizeof(client_t));
1227 if (client == NULL)
1228 return NULL;
1229
1230 fibril_mutex_initialize(&client->mutex);
1231 return client;
1232}
1233
1234static void devman_client_data_destroy(void *data)
1235{
1236 free(data);
1237}
1238
1239/** Initialize device manager internal structures. */
1240static bool devman_init(void)
1241{
1242 log_msg(LVL_DEBUG, "devman_init - looking for available drivers.");
1243
1244 /* Initialize list of available drivers. */
1245 init_driver_list(&drivers_list);
1246 if (lookup_available_drivers(&drivers_list,
1247 DRIVER_DEFAULT_STORE) == 0) {
1248 log_msg(LVL_FATAL, "No drivers found.");
1249 return false;
1250 }
1251
1252 log_msg(LVL_DEBUG, "devman_init - list of drivers has been initialized.");
1253
1254 /* Create root device node. */
1255 if (!init_device_tree(&device_tree, &drivers_list)) {
1256 log_msg(LVL_FATAL, "Failed to initialize device tree.");
1257 return false;
1258 }
1259
1260 /*
1261 * !!! devman_connection ... as the device manager is not a real loc
1262 * driver (it uses a completely different ipc protocol than an ordinary
1263 * loc driver) forwarding a connection from client to the devman by
1264 * location service would not work.
1265 */
1266 loc_server_register(NAME, devman_connection);
1267
1268 return true;
1269}
1270
1271int main(int argc, char *argv[])
1272{
1273 printf(NAME ": HelenOS Device Manager\n");
1274
1275 if (log_init(NAME, LVL_WARN) != EOK) {
1276 printf(NAME ": Error initializing logging subsystem.\n");
1277 return -1;
1278 }
1279
1280 if (!devman_init()) {
1281 log_msg(LVL_ERROR, "Error while initializing service.");
1282 return -1;
1283 }
1284
1285 /* Set handlers for incoming connections. */
1286 async_set_client_data_constructor(devman_client_data_create);
1287 async_set_client_data_destructor(devman_client_data_destroy);
1288 async_set_client_connection(devman_connection);
1289
1290 /* Register device manager at naming service. */
1291 if (service_register(SERVICE_DEVMAN) != EOK) {
1292 log_msg(LVL_ERROR, "Failed registering as a service.");
1293 return -1;
1294 }
1295
1296 printf(NAME ": Accepting connections.\n");
1297 task_retval(0);
1298 async_manager();
1299
1300 /* Never reached. */
1301 return 0;
1302}
1303
1304/** @}
1305 */
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