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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Josef Cejka |
2 | * Copyright (c) 2007 Josef Cejka |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** |
29 | /** |
30 | * @defgroup devmap Device mapper. |
30 | * @defgroup devmap Device mapper. |
31 | * @brief HelenOS device mapper. |
31 | * @brief HelenOS device mapper. |
32 | * @{ |
32 | * @{ |
33 | */ |
33 | */ |
34 | 34 | ||
35 | /** @file |
35 | /** @file |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <ipc/services.h> |
38 | #include <ipc/services.h> |
39 | #include <ipc/ns.h> |
39 | #include <ipc/ns.h> |
40 | #include <async.h> |
40 | #include <async.h> |
41 | #include <stdio.h> |
41 | #include <stdio.h> |
42 | #include <errno.h> |
42 | #include <errno.h> |
43 | #include <bool.h> |
43 | #include <bool.h> |
44 | #include <futex.h> |
44 | #include <futex.h> |
45 | #include <stdlib.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
46 | #include <string.h> |
47 | #include <ipc/devmap.h> |
47 | #include <ipc/devmap.h> |
48 | 48 | ||
49 | #define NAME "devmap" |
49 | #define NAME "devmap" |
50 | 50 | ||
51 | /** Pending lookup structure. */ |
51 | /** Pending lookup structure. */ |
52 | typedef struct { |
52 | typedef struct { |
53 | link_t link; |
53 | link_t link; |
54 | char *name; /**< Device name */ |
54 | char *name; /**< Device name */ |
55 | ipc_callid_t callid; /**< Call ID waiting for the lookup */ |
55 | ipc_callid_t callid; /**< Call ID waiting for the lookup */ |
56 | } pending_req_t; |
56 | } pending_req_t; |
57 | 57 | ||
58 | LIST_INITIALIZE(devices_list); |
58 | LIST_INITIALIZE(devices_list); |
59 | LIST_INITIALIZE(drivers_list); |
59 | LIST_INITIALIZE(drivers_list); |
60 | LIST_INITIALIZE(pending_req); |
60 | LIST_INITIALIZE(pending_req); |
61 | 61 | ||
62 | /* Locking order: |
62 | /* Locking order: |
63 | * drivers_list_futex |
63 | * drivers_list_futex |
64 | * devices_list_futex |
64 | * devices_list_futex |
65 | * (devmap_driver_t *)->devices_futex |
65 | * (devmap_driver_t *)->devices_futex |
66 | * create_handle_futex |
66 | * create_handle_futex |
67 | **/ |
67 | **/ |
68 | 68 | ||
69 | static atomic_t devices_list_futex = FUTEX_INITIALIZER; |
69 | static atomic_t devices_list_futex = FUTEX_INITIALIZER; |
70 | static atomic_t drivers_list_futex = FUTEX_INITIALIZER; |
70 | static atomic_t drivers_list_futex = FUTEX_INITIALIZER; |
71 | static atomic_t create_handle_futex = FUTEX_INITIALIZER; |
71 | static atomic_t create_handle_futex = FUTEX_INITIALIZER; |
72 | 72 | ||
73 | static int devmap_create_handle(void) |
73 | static int devmap_create_handle(void) |
74 | { |
74 | { |
75 | static int last_handle = 0; |
75 | static int last_handle = 0; |
76 | int handle; |
76 | int handle; |
77 | 77 | ||
78 | /* TODO: allow reusing old handles after their unregistration |
78 | /* TODO: allow reusing old handles after their unregistration |
79 | * and implement some version of LRU algorithm |
79 | * and implement some version of LRU algorithm |
80 | */ |
80 | */ |
81 | 81 | ||
82 | /* FIXME: overflow */ |
82 | /* FIXME: overflow */ |
83 | futex_down(&create_handle_futex); |
83 | futex_down(&create_handle_futex); |
84 | 84 | ||
85 | last_handle += 1; |
85 | last_handle += 1; |
86 | handle = last_handle; |
86 | handle = last_handle; |
87 | 87 | ||
88 | futex_up(&create_handle_futex); |
88 | futex_up(&create_handle_futex); |
89 | 89 | ||
90 | return handle; |
90 | return handle; |
91 | } |
91 | } |
92 | 92 | ||
93 | 93 | ||
94 | /** Initialize device mapper. |
94 | /** Initialize device mapper. |
95 | * |
95 | * |
96 | * |
96 | * |
97 | */ |
97 | */ |
98 | static int devmap_init() |
98 | static int devmap_init() |
99 | { |
99 | { |
100 | /* TODO: */ |
100 | /* TODO: */ |
101 | 101 | ||
102 | return EOK; |
102 | return EOK; |
103 | } |
103 | } |
104 | 104 | ||
105 | /** Find device with given name. |
105 | /** Find device with given name. |
106 | * |
106 | * |
107 | */ |
107 | */ |
108 | static devmap_device_t *devmap_device_find_name(const char *name) |
108 | static devmap_device_t *devmap_device_find_name(const char *name) |
109 | { |
109 | { |
110 | link_t *item = devices_list.next; |
110 | link_t *item = devices_list.next; |
111 | devmap_device_t *device = NULL; |
111 | devmap_device_t *device = NULL; |
112 | 112 | ||
113 | while (item != &devices_list) { |
113 | while (item != &devices_list) { |
114 | device = list_get_instance(item, devmap_device_t, devices); |
114 | device = list_get_instance(item, devmap_device_t, devices); |
115 | if (0 == str_cmp(device->name, name)) |
115 | if (0 == str_cmp(device->name, name)) |
116 | break; |
116 | break; |
117 | item = item->next; |
117 | item = item->next; |
118 | } |
118 | } |
119 | 119 | ||
120 | if (item == &devices_list) |
120 | if (item == &devices_list) |
121 | return NULL; |
121 | return NULL; |
122 | 122 | ||
123 | device = list_get_instance(item, devmap_device_t, devices); |
123 | device = list_get_instance(item, devmap_device_t, devices); |
124 | return device; |
124 | return device; |
125 | } |
125 | } |
126 | 126 | ||
127 | /** Find device with given handle. |
127 | /** Find device with given handle. |
128 | * |
128 | * |
129 | * @todo: use hash table |
129 | * @todo: use hash table |
130 | * |
130 | * |
131 | */ |
131 | */ |
132 | static devmap_device_t *devmap_device_find_handle(int handle) |
132 | static devmap_device_t *devmap_device_find_handle(int handle) |
133 | { |
133 | { |
134 | futex_down(&devices_list_futex); |
134 | futex_down(&devices_list_futex); |
135 | 135 | ||
136 | link_t *item = (&devices_list)->next; |
136 | link_t *item = (&devices_list)->next; |
137 | devmap_device_t *device = NULL; |
137 | devmap_device_t *device = NULL; |
138 | 138 | ||
139 | while (item != &devices_list) { |
139 | while (item != &devices_list) { |
140 | device = list_get_instance(item, devmap_device_t, devices); |
140 | device = list_get_instance(item, devmap_device_t, devices); |
141 | if (device->handle == handle) |
141 | if (device->handle == handle) |
142 | break; |
142 | break; |
143 | item = item->next; |
143 | item = item->next; |
144 | } |
144 | } |
145 | 145 | ||
146 | if (item == &devices_list) { |
146 | if (item == &devices_list) { |
147 | futex_up(&devices_list_futex); |
147 | futex_up(&devices_list_futex); |
148 | return NULL; |
148 | return NULL; |
149 | } |
149 | } |
150 | 150 | ||
151 | device = list_get_instance(item, devmap_device_t, devices); |
151 | device = list_get_instance(item, devmap_device_t, devices); |
152 | 152 | ||
153 | futex_up(&devices_list_futex); |
153 | futex_up(&devices_list_futex); |
154 | 154 | ||
155 | return device; |
155 | return device; |
156 | } |
156 | } |
157 | 157 | ||
158 | /** |
158 | /** |
159 | * |
159 | * |
160 | * Unregister device and free it. It's assumed that driver's device list is |
160 | * Unregister device and free it. It's assumed that driver's device list is |
161 | * already locked. |
161 | * already locked. |
162 | * |
162 | * |
163 | */ |
163 | */ |
164 | static int devmap_device_unregister_core(devmap_device_t *device) |
164 | static int devmap_device_unregister_core(devmap_device_t *device) |
165 | { |
165 | { |
166 | list_remove(&(device->devices)); |
166 | list_remove(&(device->devices)); |
167 | list_remove(&(device->driver_devices)); |
167 | list_remove(&(device->driver_devices)); |
168 | 168 | ||
169 | free(device->name); |
169 | free(device->name); |
170 | free(device); |
170 | free(device); |
171 | 171 | ||
172 | return EOK; |
172 | return EOK; |
173 | } |
173 | } |
174 | 174 | ||
175 | /** |
175 | /** |
176 | * |
176 | * |
177 | * Read info about new driver and add it into linked list of registered |
177 | * Read info about new driver and add it into linked list of registered |
178 | * drivers. |
178 | * drivers. |
179 | * |
179 | * |
180 | */ |
180 | */ |
181 | static void devmap_driver_register(devmap_driver_t **odriver) |
181 | static void devmap_driver_register(devmap_driver_t **odriver) |
182 | { |
182 | { |
183 | *odriver = NULL; |
183 | *odriver = NULL; |
184 | 184 | ||
185 | ipc_call_t icall; |
185 | ipc_call_t icall; |
186 | ipc_callid_t iid = async_get_call(&icall); |
186 | ipc_callid_t iid = async_get_call(&icall); |
187 | 187 | ||
188 | if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) { |
188 | if (IPC_GET_METHOD(icall) != DEVMAP_DRIVER_REGISTER) { |
189 | ipc_answer_0(iid, EREFUSED); |
189 | ipc_answer_0(iid, EREFUSED); |
190 | return; |
190 | return; |
191 | } |
191 | } |
192 | 192 | ||
193 | devmap_driver_t *driver = (devmap_driver_t *) malloc(sizeof(devmap_driver_t)); |
193 | devmap_driver_t *driver = (devmap_driver_t *) malloc(sizeof(devmap_driver_t)); |
194 | 194 | ||
195 | if (driver == NULL) { |
195 | if (driver == NULL) { |
196 | ipc_answer_0(iid, ENOMEM); |
196 | ipc_answer_0(iid, ENOMEM); |
197 | return; |
197 | return; |
198 | } |
198 | } |
199 | 199 | ||
200 | /* |
200 | /* |
201 | * Get driver name |
201 | * Get driver name |
202 | */ |
202 | */ |
203 | ipc_callid_t callid; |
203 | ipc_callid_t callid; |
204 | size_t name_size; |
204 | size_t name_size; |
205 | if (!ipc_data_write_receive(&callid, &name_size)) { |
205 | if (!ipc_data_write_receive(&callid, &name_size)) { |
206 | free(driver); |
206 | free(driver); |
207 | ipc_answer_0(callid, EREFUSED); |
207 | ipc_answer_0(callid, EREFUSED); |
208 | ipc_answer_0(iid, EREFUSED); |
208 | ipc_answer_0(iid, EREFUSED); |
209 | return; |
209 | return; |
210 | } |
210 | } |
211 | 211 | ||
212 | if (name_size > DEVMAP_NAME_MAXLEN) { |
212 | if (name_size > DEVMAP_NAME_MAXLEN) { |
213 | free(driver); |
213 | free(driver); |
214 | ipc_answer_0(callid, EINVAL); |
214 | ipc_answer_0(callid, EINVAL); |
215 | ipc_answer_0(iid, EREFUSED); |
215 | ipc_answer_0(iid, EREFUSED); |
216 | return; |
216 | return; |
217 | } |
217 | } |
218 | 218 | ||
219 | /* |
219 | /* |
220 | * Allocate buffer for device name. |
220 | * Allocate buffer for device name. |
221 | */ |
221 | */ |
222 | driver->name = (char *) malloc(name_size + 1); |
222 | driver->name = (char *) malloc(name_size + 1); |
223 | if (driver->name == NULL) { |
223 | if (driver->name == NULL) { |
224 | free(driver); |
224 | free(driver); |
225 | ipc_answer_0(callid, ENOMEM); |
225 | ipc_answer_0(callid, ENOMEM); |
226 | ipc_answer_0(iid, EREFUSED); |
226 | ipc_answer_0(iid, EREFUSED); |
227 | return; |
227 | return; |
228 | } |
228 | } |
229 | 229 | ||
230 | /* |
230 | /* |
231 | * Send confirmation to sender and get data into buffer. |
231 | * Send confirmation to sender and get data into buffer. |
232 | */ |
232 | */ |
233 | if (EOK != ipc_data_write_finalize(callid, driver->name, name_size)) { |
233 | if (EOK != ipc_data_write_finalize(callid, driver->name, name_size)) { |
234 | free(driver->name); |
234 | free(driver->name); |
235 | free(driver); |
235 | free(driver); |
236 | ipc_answer_0(iid, EREFUSED); |
236 | ipc_answer_0(iid, EREFUSED); |
237 | return; |
237 | return; |
238 | } |
238 | } |
239 | 239 | ||
240 | driver->name[name_size] = 0; |
240 | driver->name[name_size] = 0; |
241 | 241 | ||
242 | /* Initialize futex for list of devices owned by this driver */ |
242 | /* Initialize futex for list of devices owned by this driver */ |
243 | futex_initialize(&(driver->devices_futex), 1); |
243 | futex_initialize(&(driver->devices_futex), 1); |
244 | 244 | ||
245 | /* |
245 | /* |
246 | * Initialize list of asociated devices |
246 | * Initialize list of asociated devices |
247 | */ |
247 | */ |
248 | list_initialize(&(driver->devices)); |
248 | list_initialize(&(driver->devices)); |
249 | 249 | ||
250 | /* |
250 | /* |
251 | * Create connection to the driver |
251 | * Create connection to the driver |
252 | */ |
252 | */ |
253 | ipc_call_t call; |
253 | ipc_call_t call; |
254 | callid = async_get_call(&call); |
254 | callid = async_get_call(&call); |
255 | 255 | ||
256 | if (IPC_M_CONNECT_TO_ME != IPC_GET_METHOD(call)) { |
256 | if (IPC_M_CONNECT_TO_ME != IPC_GET_METHOD(call)) { |
257 | ipc_answer_0(callid, ENOTSUP); |
257 | ipc_answer_0(callid, ENOTSUP); |
258 | 258 | ||
259 | free(driver->name); |
259 | free(driver->name); |
260 | free(driver); |
260 | free(driver); |
261 | ipc_answer_0(iid, ENOTSUP); |
261 | ipc_answer_0(iid, ENOTSUP); |
262 | return; |
262 | return; |
263 | } |
263 | } |
264 | 264 | ||
265 | driver->phone = IPC_GET_ARG5(call); |
265 | driver->phone = IPC_GET_ARG5(call); |
266 | 266 | ||
267 | ipc_answer_0(callid, EOK); |
267 | ipc_answer_0(callid, EOK); |
268 | 268 | ||
269 | list_initialize(&(driver->drivers)); |
269 | list_initialize(&(driver->drivers)); |
270 | 270 | ||
271 | futex_down(&drivers_list_futex); |
271 | futex_down(&drivers_list_futex); |
272 | 272 | ||
273 | /* TODO: |
273 | /* TODO: |
274 | * check that no driver with name equal to driver->name is registered |
274 | * check that no driver with name equal to driver->name is registered |
275 | */ |
275 | */ |
276 | 276 | ||
277 | /* |
277 | /* |
278 | * Insert new driver into list of registered drivers |
278 | * Insert new driver into list of registered drivers |
279 | */ |
279 | */ |
280 | list_append(&(driver->drivers), &drivers_list); |
280 | list_append(&(driver->drivers), &drivers_list); |
281 | futex_up(&drivers_list_futex); |
281 | futex_up(&drivers_list_futex); |
282 | 282 | ||
283 | ipc_answer_0(iid, EOK); |
283 | ipc_answer_0(iid, EOK); |
284 | 284 | ||
285 | *odriver = driver; |
285 | *odriver = driver; |
286 | } |
286 | } |
287 | 287 | ||
288 | /** |
288 | /** |
289 | * Unregister device driver, unregister all its devices and free driver |
289 | * Unregister device driver, unregister all its devices and free driver |
290 | * structure. |
290 | * structure. |
291 | * |
291 | * |
292 | */ |
292 | */ |
293 | static int devmap_driver_unregister(devmap_driver_t *driver) |
293 | static int devmap_driver_unregister(devmap_driver_t *driver) |
294 | { |
294 | { |
295 | if (driver == NULL) |
295 | if (driver == NULL) |
296 | return EEXISTS; |
296 | return EEXISTS; |
297 | 297 | ||
298 | futex_down(&drivers_list_futex); |
298 | futex_down(&drivers_list_futex); |
299 | 299 | ||
300 | ipc_hangup(driver->phone); |
300 | ipc_hangup(driver->phone); |
301 | 301 | ||
302 | /* remove it from list of drivers */ |
302 | /* remove it from list of drivers */ |
303 | list_remove(&(driver->drivers)); |
303 | list_remove(&(driver->drivers)); |
304 | 304 | ||
305 | /* unregister all its devices */ |
305 | /* unregister all its devices */ |
306 | 306 | ||
307 | futex_down(&devices_list_futex); |
307 | futex_down(&devices_list_futex); |
308 | futex_down(&(driver->devices_futex)); |
308 | futex_down(&(driver->devices_futex)); |
309 | 309 | ||
310 | while (!list_empty(&(driver->devices))) { |
310 | while (!list_empty(&(driver->devices))) { |
311 | devmap_device_t *device = list_get_instance(driver->devices.next, |
311 | devmap_device_t *device = list_get_instance(driver->devices.next, |
312 | devmap_device_t, driver_devices); |
312 | devmap_device_t, driver_devices); |
313 | devmap_device_unregister_core(device); |
313 | devmap_device_unregister_core(device); |
314 | } |
314 | } |
315 | 315 | ||
316 | futex_up(&(driver->devices_futex)); |
316 | futex_up(&(driver->devices_futex)); |
317 | futex_up(&devices_list_futex); |
317 | futex_up(&devices_list_futex); |
318 | futex_up(&drivers_list_futex); |
318 | futex_up(&drivers_list_futex); |
319 | 319 | ||
320 | /* free name and driver */ |
320 | /* free name and driver */ |
321 | if (NULL != driver->name) |
321 | if (NULL != driver->name) |
322 | free(driver->name); |
322 | free(driver->name); |
323 | 323 | ||
324 | free(driver); |
324 | free(driver); |
325 | 325 | ||
326 | return EOK; |
326 | return EOK; |
327 | } |
327 | } |
328 | 328 | ||
329 | 329 | ||
330 | /** Process pending lookup requests */ |
330 | /** Process pending lookup requests */ |
331 | static void process_pending_lookup() |
331 | static void process_pending_lookup() |
332 | { |
332 | { |
333 | link_t *cur; |
333 | link_t *cur; |
334 | 334 | ||
335 | loop: |
335 | loop: |
336 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
336 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
337 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
337 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
338 | 338 | ||
339 | const devmap_device_t *dev = devmap_device_find_name(pr->name); |
339 | const devmap_device_t *dev = devmap_device_find_name(pr->name); |
340 | if (!dev) |
340 | if (!dev) |
341 | continue; |
341 | continue; |
342 | 342 | ||
343 | ipc_answer_1(pr->callid, EOK, dev->handle); |
343 | ipc_answer_1(pr->callid, EOK, dev->handle); |
344 | 344 | ||
345 | free(pr->name); |
345 | free(pr->name); |
346 | list_remove(cur); |
346 | list_remove(cur); |
347 | free(pr); |
347 | free(pr); |
348 | goto loop; |
348 | goto loop; |
349 | } |
349 | } |
350 | } |
350 | } |
351 | 351 | ||
352 | 352 | ||
353 | /** Register instance of device |
353 | /** Register instance of device |
354 | * |
354 | * |
355 | */ |
355 | */ |
356 | static void devmap_device_register(ipc_callid_t iid, ipc_call_t *icall, |
356 | static void devmap_device_register(ipc_callid_t iid, ipc_call_t *icall, |
357 | devmap_driver_t *driver) |
357 | devmap_driver_t *driver) |
358 | { |
358 | { |
359 | if (driver == NULL) { |
359 | if (driver == NULL) { |
360 | ipc_answer_0(iid, EREFUSED); |
360 | ipc_answer_0(iid, EREFUSED); |
361 | return; |
361 | return; |
362 | } |
362 | } |
363 | 363 | ||
364 | /* Create new device entry */ |
364 | /* Create new device entry */ |
365 | devmap_device_t *device = (devmap_device_t *) malloc(sizeof(devmap_device_t)); |
365 | devmap_device_t *device = (devmap_device_t *) malloc(sizeof(devmap_device_t)); |
366 | if (device == NULL) { |
366 | if (device == NULL) { |
367 | ipc_answer_0(iid, ENOMEM); |
367 | ipc_answer_0(iid, ENOMEM); |
368 | return; |
368 | return; |
369 | } |
369 | } |
370 | 370 | ||
371 | /* Get device name */ |
371 | /* Get device name */ |
372 | ipc_callid_t callid; |
372 | ipc_callid_t callid; |
373 | size_t size; |
373 | size_t size; |
374 | if (!ipc_data_write_receive(&callid, &size)) { |
374 | if (!ipc_data_write_receive(&callid, &size)) { |
375 | free(device); |
375 | free(device); |
376 | ipc_answer_0(iid, EREFUSED); |
376 | ipc_answer_0(iid, EREFUSED); |
377 | return; |
377 | return; |
378 | } |
378 | } |
379 | 379 | ||
380 | if (size > DEVMAP_NAME_MAXLEN) { |
380 | if (size > DEVMAP_NAME_MAXLEN) { |
381 | free(device); |
381 | free(device); |
382 | ipc_answer_0(callid, EINVAL); |
382 | ipc_answer_0(callid, EINVAL); |
383 | ipc_answer_0(iid, EREFUSED); |
383 | ipc_answer_0(iid, EREFUSED); |
384 | return; |
384 | return; |
385 | } |
385 | } |
386 | 386 | ||
387 | /* +1 for terminating \0 */ |
387 | /* +1 for terminating \0 */ |
388 | device->name = (char *) malloc(size + 1); |
388 | device->name = (char *) malloc(size + 1); |
389 | 389 | ||
390 | if (device->name == NULL) { |
390 | if (device->name == NULL) { |
391 | free(device); |
391 | free(device); |
392 | ipc_answer_0(callid, ENOMEM); |
392 | ipc_answer_0(callid, ENOMEM); |
393 | ipc_answer_0(iid, EREFUSED); |
393 | ipc_answer_0(iid, EREFUSED); |
394 | return; |
394 | return; |
395 | } |
395 | } |
396 | 396 | ||
397 | ipc_data_write_finalize(callid, device->name, size); |
397 | ipc_data_write_finalize(callid, device->name, size); |
398 | device->name[size] = 0; |
398 | device->name[size] = 0; |
399 | 399 | ||
400 | list_initialize(&(device->devices)); |
400 | list_initialize(&(device->devices)); |
401 | list_initialize(&(device->driver_devices)); |
401 | list_initialize(&(device->driver_devices)); |
402 | 402 | ||
403 | futex_down(&devices_list_futex); |
403 | futex_down(&devices_list_futex); |
404 | 404 | ||
405 | /* Check that device with such name is not already registered */ |
405 | /* Check that device with such name is not already registered */ |
406 | if (NULL != devmap_device_find_name(device->name)) { |
406 | if (NULL != devmap_device_find_name(device->name)) { |
407 | printf(NAME ": Device '%s' already registered\n", device->name); |
407 | printf(NAME ": Device '%s' already registered\n", device->name); |
408 | futex_up(&devices_list_futex); |
408 | futex_up(&devices_list_futex); |
409 | free(device->name); |
409 | free(device->name); |
410 | free(device); |
410 | free(device); |
411 | ipc_answer_0(iid, EEXISTS); |
411 | ipc_answer_0(iid, EEXISTS); |
412 | return; |
412 | return; |
413 | } |
413 | } |
414 | 414 | ||
415 | /* Get unique device handle */ |
415 | /* Get unique device handle */ |
416 | device->handle = devmap_create_handle(); |
416 | device->handle = devmap_create_handle(); |
417 | 417 | ||
418 | device->driver = driver; |
418 | device->driver = driver; |
419 | 419 | ||
420 | /* Insert device into list of all devices */ |
420 | /* Insert device into list of all devices */ |
421 | list_append(&device->devices, &devices_list); |
421 | list_append(&device->devices, &devices_list); |
422 | 422 | ||
423 | /* Insert device into list of devices that belog to one driver */ |
423 | /* Insert device into list of devices that belog to one driver */ |
424 | futex_down(&device->driver->devices_futex); |
424 | futex_down(&device->driver->devices_futex); |
425 | 425 | ||
426 | list_append(&device->driver_devices, &device->driver->devices); |
426 | list_append(&device->driver_devices, &device->driver->devices); |
427 | 427 | ||
428 | futex_up(&device->driver->devices_futex); |
428 | futex_up(&device->driver->devices_futex); |
429 | futex_up(&devices_list_futex); |
429 | futex_up(&devices_list_futex); |
430 | 430 | ||
431 | ipc_answer_1(iid, EOK, device->handle); |
431 | ipc_answer_1(iid, EOK, device->handle); |
432 | 432 | ||
433 | process_pending_lookup(); |
433 | process_pending_lookup(); |
434 | } |
434 | } |
435 | 435 | ||
436 | /** |
436 | /** |
437 | * |
437 | * |
438 | */ |
438 | */ |
439 | static int devmap_device_unregister(ipc_callid_t iid, ipc_call_t *icall, |
439 | static int devmap_device_unregister(ipc_callid_t iid, ipc_call_t *icall, |
440 | devmap_driver_t *driver) |
440 | devmap_driver_t *driver) |
441 | { |
441 | { |
442 | /* TODO */ |
442 | /* TODO */ |
443 | return EOK; |
443 | return EOK; |
444 | } |
444 | } |
445 | 445 | ||
446 | /** Connect client to the device. |
446 | /** Connect client to the device. |
447 | * |
447 | * |
448 | * Find device driver owning requested device and forward |
448 | * Find device driver owning requested device and forward |
449 | * the message to it. |
449 | * the message to it. |
450 | * |
450 | * |
451 | */ |
451 | */ |
452 | static void devmap_forward(ipc_callid_t callid, ipc_call_t *call) |
452 | static void devmap_forward(ipc_callid_t callid, ipc_call_t *call) |
453 | { |
453 | { |
454 | /* |
454 | /* |
455 | * Get handle from request |
455 | * Get handle from request |
456 | */ |
456 | */ |
457 | int handle = IPC_GET_ARG2(*call); |
457 | int handle = IPC_GET_ARG2(*call); |
458 | devmap_device_t *dev = devmap_device_find_handle(handle); |
458 | devmap_device_t *dev = devmap_device_find_handle(handle); |
459 | 459 | ||
460 | if (NULL == dev) { |
460 | if (NULL == dev) { |
461 | ipc_answer_0(callid, ENOENT); |
461 | ipc_answer_0(callid, ENOENT); |
462 | return; |
462 | return; |
463 | } |
463 | } |
464 | 464 | ||
465 | ipc_forward_fast(callid, dev->driver->phone, (ipcarg_t)(dev->handle), |
465 | ipc_forward_fast(callid, dev->driver->phone, (ipcarg_t)(dev->handle), |
466 | IPC_GET_ARG3(*call), 0, IPC_FF_NONE); |
466 | IPC_GET_ARG3(*call), 0, IPC_FF_NONE); |
467 | } |
467 | } |
468 | 468 | ||
469 | /** Find handle for device instance identified by name. |
469 | /** Find handle for device instance identified by name. |
470 | * |
470 | * |
471 | * In answer will be send EOK and device handle in arg1 or a error |
471 | * In answer will be send EOK and device handle in arg1 or a error |
472 | * code from errno.h. |
472 | * code from errno.h. |
473 | * |
473 | * |
474 | */ |
474 | */ |
475 | static void devmap_get_handle(ipc_callid_t iid, ipc_call_t *icall) |
475 | static void devmap_get_handle(ipc_callid_t iid, ipc_call_t *icall) |
476 | { |
476 | { |
477 | /* |
477 | /* |
478 | * Wait for incoming message with device name (but do not |
478 | * Wait for incoming message with device name (but do not |
479 | * read the name itself until the buffer is allocated). |
479 | * read the name itself until the buffer is allocated). |
480 | */ |
480 | */ |
481 | ipc_callid_t callid; |
481 | ipc_callid_t callid; |
482 | size_t size; |
482 | size_t size; |
483 | if (!ipc_data_write_receive(&callid, &size)) { |
483 | if (!ipc_data_write_receive(&callid, &size)) { |
484 | ipc_answer_0(callid, EREFUSED); |
484 | ipc_answer_0(callid, EREFUSED); |
485 | ipc_answer_0(iid, EREFUSED); |
485 | ipc_answer_0(iid, EREFUSED); |
486 | return; |
486 | return; |
487 | } |
487 | } |
488 | 488 | ||
489 | if ((size < 1) || (size > DEVMAP_NAME_MAXLEN)) { |
489 | if ((size < 1) || (size > DEVMAP_NAME_MAXLEN)) { |
490 | ipc_answer_0(callid, EINVAL); |
490 | ipc_answer_0(callid, EINVAL); |
491 | ipc_answer_0(iid, EREFUSED); |
491 | ipc_answer_0(iid, EREFUSED); |
492 | return; |
492 | return; |
493 | } |
493 | } |
494 | 494 | ||
495 | /* |
495 | /* |
496 | * Allocate buffer for device name. |
496 | * Allocate buffer for device name. |
497 | */ |
497 | */ |
498 | char *name = (char *) malloc(size); |
498 | char *name = (char *) malloc(size); |
499 | if (name == NULL) { |
499 | if (name == NULL) { |
500 | ipc_answer_0(callid, ENOMEM); |
500 | ipc_answer_0(callid, ENOMEM); |
501 | ipc_answer_0(iid, EREFUSED); |
501 | ipc_answer_0(iid, EREFUSED); |
502 | return; |
502 | return; |
503 | } |
503 | } |
504 | 504 | ||
505 | /* |
505 | /* |
506 | * Send confirmation to sender and get data into buffer. |
506 | * Send confirmation to sender and get data into buffer. |
507 | */ |
507 | */ |
508 | ipcarg_t retval = ipc_data_write_finalize(callid, name, size); |
508 | ipcarg_t retval = ipc_data_write_finalize(callid, name, size); |
509 | if (retval != EOK) { |
509 | if (retval != EOK) { |
510 | ipc_answer_0(iid, EREFUSED); |
510 | ipc_answer_0(iid, EREFUSED); |
511 | free(name); |
511 | free(name); |
512 | return; |
512 | return; |
513 | } |
513 | } |
514 | name[size] = '\0'; |
514 | name[size] = '\0'; |
515 | 515 | ||
516 | /* |
516 | /* |
517 | * Find device name in linked list of known devices. |
517 | * Find device name in linked list of known devices. |
518 | */ |
518 | */ |
519 | const devmap_device_t *dev = devmap_device_find_name(name); |
519 | const devmap_device_t *dev = devmap_device_find_name(name); |
520 | 520 | ||
521 | /* |
521 | /* |
522 | * Device was not found. |
522 | * Device was not found. |
523 | */ |
523 | */ |
524 | if (dev == NULL) { |
524 | if (dev == NULL) { |
525 | if (IPC_GET_ARG1(*icall) & IPC_FLAG_BLOCKING) { |
525 | if (IPC_GET_ARG1(*icall) & IPC_FLAG_BLOCKING) { |
526 | /* Blocking lookup, add to pending list */ |
526 | /* Blocking lookup, add to pending list */ |
527 | pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
527 | pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
528 | if (!pr) { |
528 | if (!pr) { |
529 | ipc_answer_0(iid, ENOMEM); |
529 | ipc_answer_0(iid, ENOMEM); |
530 | free(name); |
530 | free(name); |
531 | return; |
531 | return; |
532 | } |
532 | } |
533 | 533 | ||
534 | pr->name = name; |
534 | pr->name = name; |
535 | pr->callid = iid; |
535 | pr->callid = iid; |
536 | list_append(&pr->link, &pending_req); |
536 | list_append(&pr->link, &pending_req); |
537 | return; |
537 | return; |
538 | } |
538 | } |
539 | 539 | ||
540 | ipc_answer_0(iid, ENOENT); |
540 | ipc_answer_0(iid, ENOENT); |
541 | free(name); |
541 | free(name); |
542 | return; |
542 | return; |
543 | } |
543 | } |
544 | 544 | ||
545 | ipc_answer_1(iid, EOK, dev->handle); |
545 | ipc_answer_1(iid, EOK, dev->handle); |
546 | free(name); |
546 | free(name); |
547 | } |
547 | } |
548 | 548 | ||
549 | /** Find name of device identified by id and send it to caller. |
549 | /** Find name of device identified by id and send it to caller. |
550 | * |
550 | * |
551 | */ |
551 | */ |
552 | static void devmap_get_name(ipc_callid_t iid, ipc_call_t *icall) |
552 | static void devmap_get_name(ipc_callid_t iid, ipc_call_t *icall) |
553 | { |
553 | { |
554 | const devmap_device_t *device = devmap_device_find_handle(IPC_GET_ARG1(*icall)); |
554 | const devmap_device_t *device = devmap_device_find_handle(IPC_GET_ARG1(*icall)); |
555 | 555 | ||
556 | /* |
556 | /* |
557 | * Device not found. |
557 | * Device not found. |
558 | */ |
558 | */ |
559 | if (device == NULL) { |
559 | if (device == NULL) { |
560 | ipc_answer_0(iid, ENOENT); |
560 | ipc_answer_0(iid, ENOENT); |
561 | return; |
561 | return; |
562 | } |
562 | } |
563 | 563 | ||
564 | ipc_answer_0(iid, EOK); |
564 | ipc_answer_0(iid, EOK); |
565 | 565 | ||
566 | size_t name_size = strlen(device->name); |
566 | size_t name_size = str_size(device->name); |
567 | 567 | ||
568 | /* FIXME: |
568 | /* FIXME: |
569 | * We have no channel from DEVMAP to client, therefore |
569 | * We have no channel from DEVMAP to client, therefore |
570 | * sending must be initiated by client. |
570 | * sending must be initiated by client. |
571 | * |
571 | * |
572 | * int rc = ipc_data_write_send(phone, device->name, name_size); |
572 | * int rc = ipc_data_write_send(phone, device->name, name_size); |
573 | * if (rc != EOK) { |
573 | * if (rc != EOK) { |
574 | * async_wait_for(req, NULL); |
574 | * async_wait_for(req, NULL); |
575 | * return rc; |
575 | * return rc; |
576 | * } |
576 | * } |
577 | */ |
577 | */ |
578 | 578 | ||
579 | /* TODO: send name in response */ |
579 | /* TODO: send name in response */ |
580 | } |
580 | } |
581 | 581 | ||
582 | /** Handle connection with device driver. |
582 | /** Handle connection with device driver. |
583 | * |
583 | * |
584 | */ |
584 | */ |
585 | static void devmap_connection_driver(ipc_callid_t iid, ipc_call_t *icall) |
585 | static void devmap_connection_driver(ipc_callid_t iid, ipc_call_t *icall) |
586 | { |
586 | { |
587 | /* Accept connection */ |
587 | /* Accept connection */ |
588 | ipc_answer_0(iid, EOK); |
588 | ipc_answer_0(iid, EOK); |
589 | 589 | ||
590 | devmap_driver_t *driver = NULL; |
590 | devmap_driver_t *driver = NULL; |
591 | devmap_driver_register(&driver); |
591 | devmap_driver_register(&driver); |
592 | 592 | ||
593 | if (NULL == driver) |
593 | if (NULL == driver) |
594 | return; |
594 | return; |
595 | 595 | ||
596 | bool cont = true; |
596 | bool cont = true; |
597 | while (cont) { |
597 | while (cont) { |
598 | ipc_call_t call; |
598 | ipc_call_t call; |
599 | ipc_callid_t callid = async_get_call(&call); |
599 | ipc_callid_t callid = async_get_call(&call); |
600 | 600 | ||
601 | switch (IPC_GET_METHOD(call)) { |
601 | switch (IPC_GET_METHOD(call)) { |
602 | case IPC_M_PHONE_HUNGUP: |
602 | case IPC_M_PHONE_HUNGUP: |
603 | cont = false; |
603 | cont = false; |
604 | /* Exit thread */ |
604 | /* Exit thread */ |
605 | continue; |
605 | continue; |
606 | case DEVMAP_DRIVER_UNREGISTER: |
606 | case DEVMAP_DRIVER_UNREGISTER: |
607 | if (NULL == driver) |
607 | if (NULL == driver) |
608 | ipc_answer_0(callid, ENOENT); |
608 | ipc_answer_0(callid, ENOENT); |
609 | else |
609 | else |
610 | ipc_answer_0(callid, EOK); |
610 | ipc_answer_0(callid, EOK); |
611 | break; |
611 | break; |
612 | case DEVMAP_DEVICE_REGISTER: |
612 | case DEVMAP_DEVICE_REGISTER: |
613 | /* Register one instance of device */ |
613 | /* Register one instance of device */ |
614 | devmap_device_register(callid, &call, driver); |
614 | devmap_device_register(callid, &call, driver); |
615 | break; |
615 | break; |
616 | case DEVMAP_DEVICE_UNREGISTER: |
616 | case DEVMAP_DEVICE_UNREGISTER: |
617 | /* Remove instance of device identified by handler */ |
617 | /* Remove instance of device identified by handler */ |
618 | devmap_device_unregister(callid, &call, driver); |
618 | devmap_device_unregister(callid, &call, driver); |
619 | break; |
619 | break; |
620 | case DEVMAP_DEVICE_GET_HANDLE: |
620 | case DEVMAP_DEVICE_GET_HANDLE: |
621 | devmap_get_handle(callid, &call); |
621 | devmap_get_handle(callid, &call); |
622 | break; |
622 | break; |
623 | case DEVMAP_DEVICE_GET_NAME: |
623 | case DEVMAP_DEVICE_GET_NAME: |
624 | devmap_get_handle(callid, &call); |
624 | devmap_get_handle(callid, &call); |
625 | break; |
625 | break; |
626 | default: |
626 | default: |
627 | if (!(callid & IPC_CALLID_NOTIFICATION)) |
627 | if (!(callid & IPC_CALLID_NOTIFICATION)) |
628 | ipc_answer_0(callid, ENOENT); |
628 | ipc_answer_0(callid, ENOENT); |
629 | } |
629 | } |
630 | } |
630 | } |
631 | 631 | ||
632 | if (NULL != driver) { |
632 | if (NULL != driver) { |
633 | /* |
633 | /* |
634 | * Unregister the device driver and all its devices. |
634 | * Unregister the device driver and all its devices. |
635 | */ |
635 | */ |
636 | devmap_driver_unregister(driver); |
636 | devmap_driver_unregister(driver); |
637 | driver = NULL; |
637 | driver = NULL; |
638 | } |
638 | } |
639 | } |
639 | } |
640 | 640 | ||
641 | /** Handle connection with device client. |
641 | /** Handle connection with device client. |
642 | * |
642 | * |
643 | */ |
643 | */ |
644 | static void devmap_connection_client(ipc_callid_t iid, ipc_call_t *icall) |
644 | static void devmap_connection_client(ipc_callid_t iid, ipc_call_t *icall) |
645 | { |
645 | { |
646 | /* Accept connection */ |
646 | /* Accept connection */ |
647 | ipc_answer_0(iid, EOK); |
647 | ipc_answer_0(iid, EOK); |
648 | 648 | ||
649 | bool cont = true; |
649 | bool cont = true; |
650 | while (cont) { |
650 | while (cont) { |
651 | ipc_call_t call; |
651 | ipc_call_t call; |
652 | ipc_callid_t callid = async_get_call(&call); |
652 | ipc_callid_t callid = async_get_call(&call); |
653 | 653 | ||
654 | switch (IPC_GET_METHOD(call)) { |
654 | switch (IPC_GET_METHOD(call)) { |
655 | case IPC_M_PHONE_HUNGUP: |
655 | case IPC_M_PHONE_HUNGUP: |
656 | cont = false; |
656 | cont = false; |
657 | /* Exit thread */ |
657 | /* Exit thread */ |
658 | continue; |
658 | continue; |
659 | case DEVMAP_DEVICE_GET_HANDLE: |
659 | case DEVMAP_DEVICE_GET_HANDLE: |
660 | devmap_get_handle(callid, &call); |
660 | devmap_get_handle(callid, &call); |
661 | break; |
661 | break; |
662 | case DEVMAP_DEVICE_GET_NAME: |
662 | case DEVMAP_DEVICE_GET_NAME: |
663 | /* TODO */ |
663 | /* TODO */ |
664 | devmap_get_name(callid, &call); |
664 | devmap_get_name(callid, &call); |
665 | break; |
665 | break; |
666 | default: |
666 | default: |
667 | if (!(callid & IPC_CALLID_NOTIFICATION)) |
667 | if (!(callid & IPC_CALLID_NOTIFICATION)) |
668 | ipc_answer_0(callid, ENOENT); |
668 | ipc_answer_0(callid, ENOENT); |
669 | } |
669 | } |
670 | } |
670 | } |
671 | } |
671 | } |
672 | 672 | ||
673 | /** Function for handling connections to devmap |
673 | /** Function for handling connections to devmap |
674 | * |
674 | * |
675 | */ |
675 | */ |
676 | static void devmap_connection(ipc_callid_t iid, ipc_call_t *icall) |
676 | static void devmap_connection(ipc_callid_t iid, ipc_call_t *icall) |
677 | { |
677 | { |
678 | /* Select interface */ |
678 | /* Select interface */ |
679 | switch ((ipcarg_t) (IPC_GET_ARG1(*icall))) { |
679 | switch ((ipcarg_t) (IPC_GET_ARG1(*icall))) { |
680 | case DEVMAP_DRIVER: |
680 | case DEVMAP_DRIVER: |
681 | devmap_connection_driver(iid, icall); |
681 | devmap_connection_driver(iid, icall); |
682 | break; |
682 | break; |
683 | case DEVMAP_CLIENT: |
683 | case DEVMAP_CLIENT: |
684 | devmap_connection_client(iid, icall); |
684 | devmap_connection_client(iid, icall); |
685 | break; |
685 | break; |
686 | case DEVMAP_CONNECT_TO_DEVICE: |
686 | case DEVMAP_CONNECT_TO_DEVICE: |
687 | /* Connect client to selected device */ |
687 | /* Connect client to selected device */ |
688 | devmap_forward(iid, icall); |
688 | devmap_forward(iid, icall); |
689 | break; |
689 | break; |
690 | default: |
690 | default: |
691 | /* No such interface */ |
691 | /* No such interface */ |
692 | ipc_answer_0(iid, ENOENT); |
692 | ipc_answer_0(iid, ENOENT); |
693 | } |
693 | } |
694 | } |
694 | } |
695 | 695 | ||
696 | /** |
696 | /** |
697 | * |
697 | * |
698 | */ |
698 | */ |
699 | int main(int argc, char *argv[]) |
699 | int main(int argc, char *argv[]) |
700 | { |
700 | { |
701 | printf(NAME ": HelenOS Device Mapper\n"); |
701 | printf(NAME ": HelenOS Device Mapper\n"); |
702 | 702 | ||
703 | if (devmap_init() != 0) { |
703 | if (devmap_init() != 0) { |
704 | printf(NAME ": Error while initializing service\n"); |
704 | printf(NAME ": Error while initializing service\n"); |
705 | return -1; |
705 | return -1; |
706 | } |
706 | } |
707 | 707 | ||
708 | /* Set a handler of incomming connections */ |
708 | /* Set a handler of incomming connections */ |
709 | async_set_client_connection(devmap_connection); |
709 | async_set_client_connection(devmap_connection); |
710 | 710 | ||
711 | /* Register device mapper at naming service */ |
711 | /* Register device mapper at naming service */ |
712 | ipcarg_t phonead; |
712 | ipcarg_t phonead; |
713 | if (ipc_connect_to_me(PHONE_NS, SERVICE_DEVMAP, 0, 0, &phonead) != 0) |
713 | if (ipc_connect_to_me(PHONE_NS, SERVICE_DEVMAP, 0, 0, &phonead) != 0) |
714 | return -1; |
714 | return -1; |
715 | 715 | ||
716 | printf(NAME ": Accepting connections\n"); |
716 | printf(NAME ": Accepting connections\n"); |
717 | async_manager(); |
717 | async_manager(); |
718 | 718 | ||
719 | /* Never reached */ |
719 | /* Never reached */ |
720 | return 0; |
720 | return 0; |
721 | } |
721 | } |
722 | 722 | ||
723 | /** |
723 | /** |
724 | * @} |
724 | * @} |
725 | */ |
725 | */ |
726 | 726 |