source: mainline/uspace/lib/c/generic/devmap.c@ 8e80d3f

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 8e80d3f was 64d2b10, checked in by Martin Decky <martin@…>, 15 years ago

libc: do not intermix low-level IPC methods with async framework methods
  • Property mode set to 100644
File size: 10.6 KB
Line 
1/*
2 * Copyright (c) 2007 Josef Cejka
3 * Copyright (c) 2009 Jiri Svoboda
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <str.h>
31#include <ipc/services.h>
32#include <ipc/ns.h>
33#include <ipc/devmap.h>
34#include <devmap.h>
35#include <async.h>
36#include <errno.h>
37#include <malloc.h>
38#include <bool.h>
39
40static int devmap_phone_driver = -1;
41static int devmap_phone_client = -1;
42
43/** Get phone to device mapper task. */
44int devmap_get_phone(devmap_interface_t iface, unsigned int flags)
45{
46 switch (iface) {
47 case DEVMAP_DRIVER:
48 if (devmap_phone_driver >= 0)
49 return devmap_phone_driver;
50
51 if (flags & IPC_FLAG_BLOCKING)
52 devmap_phone_driver = service_connect_blocking(SERVICE_DEVMAP,
53 DEVMAP_DRIVER, 0);
54 else
55 devmap_phone_driver = service_connect(SERVICE_DEVMAP,
56 DEVMAP_DRIVER, 0);
57
58 return devmap_phone_driver;
59 case DEVMAP_CLIENT:
60 if (devmap_phone_client >= 0)
61 return devmap_phone_client;
62
63 if (flags & IPC_FLAG_BLOCKING)
64 devmap_phone_client = service_connect_blocking(SERVICE_DEVMAP,
65 DEVMAP_CLIENT, 0);
66 else
67 devmap_phone_client = service_connect(SERVICE_DEVMAP,
68 DEVMAP_CLIENT, 0);
69
70 return devmap_phone_client;
71 default:
72 return -1;
73 }
74}
75
76void devmap_hangup_phone(devmap_interface_t iface)
77{
78 switch (iface) {
79 case DEVMAP_DRIVER:
80 if (devmap_phone_driver >= 0) {
81 async_hangup(devmap_phone_driver);
82 devmap_phone_driver = -1;
83 }
84 break;
85 case DEVMAP_CLIENT:
86 if (devmap_phone_client >= 0) {
87 async_hangup(devmap_phone_client);
88 devmap_phone_client = -1;
89 }
90 break;
91 default:
92 break;
93 }
94}
95
96/** Register new driver with devmap. */
97int devmap_driver_register(const char *name, async_client_conn_t conn)
98{
99 int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
100
101 if (phone < 0)
102 return phone;
103
104 async_serialize_start();
105
106 ipc_call_t answer;
107 aid_t req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
108
109 sysarg_t retval = async_data_write_start(phone, name, str_size(name));
110 if (retval != EOK) {
111 async_wait_for(req, NULL);
112 async_serialize_end();
113 return -1;
114 }
115
116 async_set_client_connection(conn);
117
118 async_connect_to_me(phone, 0, 0, 0, NULL);
119 async_wait_for(req, &retval);
120
121 async_serialize_end();
122
123 return retval;
124}
125
126/** Register new device.
127 *
128 * The @p interface is used when forwarding connection to the driver.
129 * If not 0, the first argument is the interface and the second argument
130 * is the devmap handle of the device.
131 * When the interface is zero (default), the first argument is directly
132 * the handle (to ensure backward compatibility).
133 *
134 * @param fqdn Fully qualified device name.
135 * @param[out] handle Handle to the created instance of device.
136 * @param interface Interface when forwarding.
137 *
138 */
139int devmap_device_register_with_iface(const char *fqdn,
140 devmap_handle_t *handle, sysarg_t interface)
141{
142 int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
143
144 if (phone < 0)
145 return phone;
146
147 async_serialize_start();
148
149 ipc_call_t answer;
150 aid_t req = async_send_2(phone, DEVMAP_DEVICE_REGISTER, interface, 0,
151 &answer);
152
153 sysarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
154 if (retval != EOK) {
155 async_wait_for(req, NULL);
156 async_serialize_end();
157 return retval;
158 }
159
160 async_wait_for(req, &retval);
161
162 async_serialize_end();
163
164 if (retval != EOK) {
165 if (handle != NULL)
166 *handle = -1;
167 return retval;
168 }
169
170 if (handle != NULL)
171 *handle = (devmap_handle_t) IPC_GET_ARG1(answer);
172
173 return retval;
174}
175
176/** Register new device.
177 *
178 * @param fqdn Fully qualified device name.
179 * @param handle Output: Handle to the created instance of device.
180 *
181 */
182int devmap_device_register(const char *fqdn, devmap_handle_t *handle)
183{
184 return devmap_device_register_with_iface(fqdn, handle, 0);
185}
186
187
188int devmap_device_get_handle(const char *fqdn, devmap_handle_t *handle, unsigned int flags)
189{
190 int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
191
192 if (phone < 0)
193 return phone;
194
195 async_serialize_start();
196
197 ipc_call_t answer;
198 aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,
199 &answer);
200
201 sysarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
202 if (retval != EOK) {
203 async_wait_for(req, NULL);
204 async_serialize_end();
205 return retval;
206 }
207
208 async_wait_for(req, &retval);
209
210 async_serialize_end();
211
212 if (retval != EOK) {
213 if (handle != NULL)
214 *handle = (devmap_handle_t) -1;
215 return retval;
216 }
217
218 if (handle != NULL)
219 *handle = (devmap_handle_t) IPC_GET_ARG1(answer);
220
221 return retval;
222}
223
224int devmap_namespace_get_handle(const char *name, devmap_handle_t *handle, unsigned int flags)
225{
226 int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
227
228 if (phone < 0)
229 return phone;
230
231 async_serialize_start();
232
233 ipc_call_t answer;
234 aid_t req = async_send_2(phone, DEVMAP_NAMESPACE_GET_HANDLE, flags, 0,
235 &answer);
236
237 sysarg_t retval = async_data_write_start(phone, name, str_size(name));
238 if (retval != EOK) {
239 async_wait_for(req, NULL);
240 async_serialize_end();
241 return retval;
242 }
243
244 async_wait_for(req, &retval);
245
246 async_serialize_end();
247
248 if (retval != EOK) {
249 if (handle != NULL)
250 *handle = (devmap_handle_t) -1;
251 return retval;
252 }
253
254 if (handle != NULL)
255 *handle = (devmap_handle_t) IPC_GET_ARG1(answer);
256
257 return retval;
258}
259
260devmap_handle_type_t devmap_handle_probe(devmap_handle_t handle)
261{
262 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
263
264 if (phone < 0)
265 return phone;
266
267 sysarg_t type;
268 int retval = async_req_1_1(phone, DEVMAP_HANDLE_PROBE, handle, &type);
269 if (retval != EOK)
270 return DEV_HANDLE_NONE;
271
272 return (devmap_handle_type_t) type;
273}
274
275int devmap_device_connect(devmap_handle_t handle, unsigned int flags)
276{
277 int phone;
278
279 if (flags & IPC_FLAG_BLOCKING) {
280 phone = async_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP,
281 DEVMAP_CONNECT_TO_DEVICE, handle);
282 } else {
283 phone = async_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
284 DEVMAP_CONNECT_TO_DEVICE, handle);
285 }
286
287 return phone;
288}
289
290int devmap_null_create(void)
291{
292 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
293
294 if (phone < 0)
295 return -1;
296
297 sysarg_t null_id;
298 int retval = async_req_0_1(phone, DEVMAP_NULL_CREATE, &null_id);
299 if (retval != EOK)
300 return -1;
301
302 return (int) null_id;
303}
304
305void devmap_null_destroy(int null_id)
306{
307 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
308
309 if (phone < 0)
310 return;
311
312 async_req_1_0(phone, DEVMAP_NULL_DESTROY, (sysarg_t) null_id);
313}
314
315static size_t devmap_count_namespaces_internal(int phone)
316{
317 sysarg_t count;
318 int retval = async_req_0_1(phone, DEVMAP_GET_NAMESPACE_COUNT, &count);
319 if (retval != EOK)
320 return 0;
321
322 return count;
323}
324
325static size_t devmap_count_devices_internal(int phone, devmap_handle_t ns_handle)
326{
327 sysarg_t count;
328 int retval = async_req_1_1(phone, DEVMAP_GET_DEVICE_COUNT, ns_handle, &count);
329 if (retval != EOK)
330 return 0;
331
332 return count;
333}
334
335size_t devmap_count_namespaces(void)
336{
337 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
338
339 if (phone < 0)
340 return 0;
341
342 return devmap_count_namespaces_internal(phone);
343}
344
345size_t devmap_count_devices(devmap_handle_t ns_handle)
346{
347 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
348
349 if (phone < 0)
350 return 0;
351
352 return devmap_count_devices_internal(phone, ns_handle);
353}
354
355size_t devmap_get_namespaces(dev_desc_t **data)
356{
357 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
358
359 if (phone < 0)
360 return 0;
361
362 /* Loop until namespaces read succesful */
363 while (true) {
364 size_t count = devmap_count_namespaces_internal(phone);
365 if (count == 0)
366 return 0;
367
368 dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
369 if (devs == NULL)
370 return 0;
371
372 async_serialize_start();
373
374 ipc_call_t answer;
375 aid_t req = async_send_0(phone, DEVMAP_GET_NAMESPACES, &answer);
376
377 int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
378 if (rc == EOVERFLOW) {
379 /*
380 * Number of namespaces has changed since
381 * the last call of DEVMAP_DEVICE_GET_NAMESPACE_COUNT
382 */
383 async_serialize_end();
384 free(devs);
385 continue;
386 }
387
388 if (rc != EOK) {
389 async_wait_for(req, NULL);
390 async_serialize_end();
391 free(devs);
392 return 0;
393 }
394
395 sysarg_t retval;
396 async_wait_for(req, &retval);
397 async_serialize_end();
398
399 if (retval != EOK)
400 return 0;
401
402 *data = devs;
403 return count;
404 }
405}
406
407size_t devmap_get_devices(devmap_handle_t ns_handle, dev_desc_t **data)
408{
409 int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
410
411 if (phone < 0)
412 return 0;
413
414 /* Loop until namespaces read succesful */
415 while (true) {
416 size_t count = devmap_count_devices_internal(phone, ns_handle);
417 if (count == 0)
418 return 0;
419
420 dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
421 if (devs == NULL)
422 return 0;
423
424 async_serialize_start();
425
426 ipc_call_t answer;
427 aid_t req = async_send_1(phone, DEVMAP_GET_DEVICES, ns_handle, &answer);
428
429 int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
430 if (rc == EOVERFLOW) {
431 /*
432 * Number of devices has changed since
433 * the last call of DEVMAP_DEVICE_GET_DEVICE_COUNT
434 */
435 async_serialize_end();
436 free(devs);
437 continue;
438 }
439
440 if (rc != EOK) {
441 async_wait_for(req, NULL);
442 async_serialize_end();
443 free(devs);
444 return 0;
445 }
446
447 sysarg_t retval;
448 async_wait_for(req, &retval);
449 async_serialize_end();
450
451 if (retval != EOK)
452 return 0;
453
454 *data = devs;
455 return count;
456 }
457}
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