Commit | Line | Data |
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8cc13a09 DV |
1 | /* |
2 | * UWB reservation management. | |
3 | * | |
4 | * Copyright (C) 2008 Cambridge Silicon Radio Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License version | |
8 | * 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
8cc13a09 DV |
18 | #include <linux/kernel.h> |
19 | #include <linux/uwb.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
5b37717a | 21 | #include <linux/random.h> |
475c0a6b | 22 | #include <linux/export.h> |
8cc13a09 DV |
23 | |
24 | #include "uwb-internal.h" | |
25 | ||
26 | static void uwb_rsv_timer(unsigned long arg); | |
27 | ||
28 | static const char *rsv_states[] = { | |
5b37717a SP |
29 | [UWB_RSV_STATE_NONE] = "none ", |
30 | [UWB_RSV_STATE_O_INITIATED] = "o initiated ", | |
31 | [UWB_RSV_STATE_O_PENDING] = "o pending ", | |
32 | [UWB_RSV_STATE_O_MODIFIED] = "o modified ", | |
33 | [UWB_RSV_STATE_O_ESTABLISHED] = "o established ", | |
34 | [UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ", | |
35 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding", | |
36 | [UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining", | |
37 | [UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ", | |
38 | [UWB_RSV_STATE_T_ACCEPTED] = "t accepted ", | |
39 | [UWB_RSV_STATE_T_CONFLICT] = "t conflict ", | |
40 | [UWB_RSV_STATE_T_PENDING] = "t pending ", | |
41 | [UWB_RSV_STATE_T_DENIED] = "t denied ", | |
42 | [UWB_RSV_STATE_T_RESIZED] = "t resized ", | |
43 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ", | |
44 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf", | |
45 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend", | |
46 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ", | |
8cc13a09 DV |
47 | }; |
48 | ||
49 | static const char *rsv_types[] = { | |
50 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", | |
51 | [UWB_DRP_TYPE_HARD] = "hard", | |
52 | [UWB_DRP_TYPE_SOFT] = "soft", | |
53 | [UWB_DRP_TYPE_PRIVATE] = "private", | |
54 | [UWB_DRP_TYPE_PCA] = "pca", | |
55 | }; | |
56 | ||
5b37717a SP |
57 | bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv) |
58 | { | |
59 | static const bool has_two_drp_ies[] = { | |
60 | [UWB_RSV_STATE_O_INITIATED] = false, | |
61 | [UWB_RSV_STATE_O_PENDING] = false, | |
62 | [UWB_RSV_STATE_O_MODIFIED] = false, | |
63 | [UWB_RSV_STATE_O_ESTABLISHED] = false, | |
64 | [UWB_RSV_STATE_O_TO_BE_MOVED] = false, | |
65 | [UWB_RSV_STATE_O_MOVE_COMBINING] = false, | |
66 | [UWB_RSV_STATE_O_MOVE_REDUCING] = false, | |
67 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = true, | |
68 | [UWB_RSV_STATE_T_ACCEPTED] = false, | |
69 | [UWB_RSV_STATE_T_CONFLICT] = false, | |
70 | [UWB_RSV_STATE_T_PENDING] = false, | |
71 | [UWB_RSV_STATE_T_DENIED] = false, | |
72 | [UWB_RSV_STATE_T_RESIZED] = false, | |
73 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true, | |
74 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true, | |
75 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = true, | |
76 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = true, | |
77 | }; | |
78 | ||
79 | return has_two_drp_ies[rsv->state]; | |
80 | } | |
81 | ||
8cc13a09 DV |
82 | /** |
83 | * uwb_rsv_state_str - return a string for a reservation state | |
84 | * @state: the reservation state. | |
85 | */ | |
86 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) | |
87 | { | |
88 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) | |
89 | return "unknown"; | |
90 | return rsv_states[state]; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); | |
93 | ||
94 | /** | |
95 | * uwb_rsv_type_str - return a string for a reservation type | |
96 | * @type: the reservation type | |
97 | */ | |
98 | const char *uwb_rsv_type_str(enum uwb_drp_type type) | |
99 | { | |
100 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) | |
101 | return "invalid"; | |
102 | return rsv_types[type]; | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); | |
105 | ||
5b37717a | 106 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
8cc13a09 DV |
107 | { |
108 | struct device *dev = &rsv->rc->uwb_dev.dev; | |
109 | struct uwb_dev_addr devaddr; | |
110 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; | |
111 | ||
112 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); | |
113 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
114 | devaddr = rsv->target.dev->dev_addr; | |
115 | else | |
116 | devaddr = rsv->target.devaddr; | |
117 | uwb_dev_addr_print(target, sizeof(target), &devaddr); | |
118 | ||
2226b1c2 DV |
119 | dev_dbg(dev, "rsv %s %s -> %s: %s\n", |
120 | text, owner, target, uwb_rsv_state_str(rsv->state)); | |
8cc13a09 DV |
121 | } |
122 | ||
cae1c114 DV |
123 | static void uwb_rsv_release(struct kref *kref) |
124 | { | |
125 | struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref); | |
126 | ||
127 | kfree(rsv); | |
128 | } | |
129 | ||
5b37717a | 130 | void uwb_rsv_get(struct uwb_rsv *rsv) |
cae1c114 DV |
131 | { |
132 | kref_get(&rsv->kref); | |
133 | } | |
134 | ||
5b37717a | 135 | void uwb_rsv_put(struct uwb_rsv *rsv) |
cae1c114 DV |
136 | { |
137 | kref_put(&rsv->kref, uwb_rsv_release); | |
138 | } | |
139 | ||
8cc13a09 DV |
140 | /* |
141 | * Get a free stream index for a reservation. | |
142 | * | |
143 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then | |
144 | * the stream is allocated from a pool of per-RC stream indexes, | |
145 | * otherwise a unique stream index for the target is selected. | |
146 | */ | |
147 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) | |
148 | { | |
149 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 150 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
151 | unsigned long *streams_bm; |
152 | int stream; | |
153 | ||
154 | switch (rsv->target.type) { | |
155 | case UWB_RSV_TARGET_DEV: | |
156 | streams_bm = rsv->target.dev->streams; | |
157 | break; | |
158 | case UWB_RSV_TARGET_DEVADDR: | |
159 | streams_bm = rc->uwb_dev.streams; | |
160 | break; | |
161 | default: | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); | |
166 | if (stream >= UWB_NUM_STREAMS) | |
167 | return -EBUSY; | |
168 | ||
169 | rsv->stream = stream; | |
170 | set_bit(stream, streams_bm); | |
171 | ||
5b37717a SP |
172 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
173 | ||
8cc13a09 DV |
174 | return 0; |
175 | } | |
176 | ||
177 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
178 | { | |
179 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 180 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
181 | unsigned long *streams_bm; |
182 | ||
183 | switch (rsv->target.type) { | |
184 | case UWB_RSV_TARGET_DEV: | |
185 | streams_bm = rsv->target.dev->streams; | |
186 | break; | |
187 | case UWB_RSV_TARGET_DEVADDR: | |
188 | streams_bm = rc->uwb_dev.streams; | |
189 | break; | |
190 | default: | |
191 | return; | |
192 | } | |
193 | ||
194 | clear_bit(rsv->stream, streams_bm); | |
5b37717a SP |
195 | |
196 | dev_dbg(dev, "put stream %d\n", rsv->stream); | |
8cc13a09 DV |
197 | } |
198 | ||
5b37717a | 199 | void uwb_rsv_backoff_win_timer(unsigned long arg) |
8cc13a09 | 200 | { |
5b37717a SP |
201 | struct uwb_drp_backoff_win *bow = (struct uwb_drp_backoff_win *)arg; |
202 | struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow); | |
203 | struct device *dev = &rc->uwb_dev.dev; | |
8cc13a09 | 204 | |
5b37717a SP |
205 | bow->can_reserve_extra_mases = true; |
206 | if (bow->total_expired <= 4) { | |
207 | bow->total_expired++; | |
208 | } else { | |
209 | /* after 4 backoff window has expired we can exit from | |
210 | * the backoff procedure */ | |
211 | bow->total_expired = 0; | |
212 | bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
8cc13a09 | 213 | } |
5b37717a SP |
214 | dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n: ", bow->total_expired, bow->n); |
215 | ||
216 | /* try to relocate all the "to be moved" relocations */ | |
217 | uwb_rsv_handle_drp_avail_change(rc); | |
8cc13a09 DV |
218 | } |
219 | ||
5b37717a | 220 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
8cc13a09 | 221 | { |
5b37717a SP |
222 | struct uwb_drp_backoff_win *bow = &rc->bow; |
223 | struct device *dev = &rc->uwb_dev.dev; | |
224 | unsigned timeout_us; | |
8cc13a09 | 225 | |
5b37717a | 226 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
8cc13a09 | 227 | |
5b37717a | 228 | bow->can_reserve_extra_mases = false; |
8cc13a09 | 229 | |
5b37717a SP |
230 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
231 | return; | |
8cc13a09 | 232 | |
5b37717a SP |
233 | bow->window <<= 1; |
234 | bow->n = random32() & (bow->window - 1); | |
235 | dev_dbg(dev, "new_window=%d, n=%d\n: ", bow->window, bow->n); | |
8cc13a09 | 236 | |
5b37717a SP |
237 | /* reset the timer associated variables */ |
238 | timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US; | |
239 | bow->total_expired = 0; | |
240 | mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
8cc13a09 DV |
241 | } |
242 | ||
243 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) | |
244 | { | |
245 | int sframes = UWB_MAX_LOST_BEACONS; | |
246 | ||
247 | /* | |
248 | * Multicast reservations can become established within 1 | |
249 | * super frame and should not be terminated if no response is | |
250 | * received. | |
251 | */ | |
252 | if (rsv->is_multicast) { | |
5b37717a SP |
253 | if (rsv->state == UWB_RSV_STATE_O_INITIATED |
254 | || rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING | |
255 | || rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING | |
256 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) | |
8cc13a09 DV |
257 | sframes = 1; |
258 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
259 | sframes = 0; | |
5b37717a | 260 | |
8cc13a09 DV |
261 | } |
262 | ||
8cc13a09 DV |
263 | if (sframes > 0) { |
264 | /* | |
265 | * Add an additional 2 superframes to account for the | |
266 | * time to send the SET DRP IE command. | |
267 | */ | |
268 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; | |
269 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
270 | } else | |
271 | del_timer(&rsv->timer); | |
272 | } | |
273 | ||
274 | /* | |
275 | * Update a reservations state, and schedule an update of the | |
276 | * transmitted DRP IEs. | |
277 | */ | |
278 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, | |
279 | enum uwb_rsv_state new_state) | |
280 | { | |
281 | rsv->state = new_state; | |
282 | rsv->ie_valid = false; | |
283 | ||
5b37717a | 284 | uwb_rsv_dump("SU", rsv); |
8cc13a09 DV |
285 | |
286 | uwb_rsv_stroke_timer(rsv); | |
287 | uwb_rsv_sched_update(rsv->rc); | |
288 | } | |
289 | ||
290 | static void uwb_rsv_callback(struct uwb_rsv *rsv) | |
291 | { | |
292 | if (rsv->callback) | |
293 | rsv->callback(rsv); | |
294 | } | |
295 | ||
296 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) | |
297 | { | |
5b37717a SP |
298 | struct uwb_rsv_move *mv = &rsv->mv; |
299 | ||
8cc13a09 DV |
300 | if (rsv->state == new_state) { |
301 | switch (rsv->state) { | |
302 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
303 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
304 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
305 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
8cc13a09 | 306 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
307 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
308 | case UWB_RSV_STATE_T_RESIZED: | |
8cc13a09 DV |
309 | case UWB_RSV_STATE_NONE: |
310 | uwb_rsv_stroke_timer(rsv); | |
311 | break; | |
312 | default: | |
313 | /* Expecting a state transition so leave timer | |
314 | as-is. */ | |
315 | break; | |
316 | } | |
317 | return; | |
318 | } | |
319 | ||
5b37717a SP |
320 | uwb_rsv_dump("SC", rsv); |
321 | ||
8cc13a09 DV |
322 | switch (new_state) { |
323 | case UWB_RSV_STATE_NONE: | |
8cc13a09 DV |
324 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); |
325 | uwb_rsv_callback(rsv); | |
326 | break; | |
327 | case UWB_RSV_STATE_O_INITIATED: | |
328 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); | |
329 | break; | |
330 | case UWB_RSV_STATE_O_PENDING: | |
331 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); | |
332 | break; | |
5b37717a SP |
333 | case UWB_RSV_STATE_O_MODIFIED: |
334 | /* in the companion there are the MASes to drop */ | |
335 | bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
336 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED); | |
337 | break; | |
8cc13a09 | 338 | case UWB_RSV_STATE_O_ESTABLISHED: |
5b37717a SP |
339 | if (rsv->state == UWB_RSV_STATE_O_MODIFIED |
340 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) { | |
341 | uwb_drp_avail_release(rsv->rc, &mv->companion_mas); | |
342 | rsv->needs_release_companion_mas = false; | |
343 | } | |
8cc13a09 DV |
344 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
345 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
346 | uwb_rsv_callback(rsv); | |
347 | break; | |
5b37717a SP |
348 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
349 | rsv->needs_release_companion_mas = true; | |
350 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
351 | break; | |
352 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
353 | rsv->needs_release_companion_mas = false; | |
354 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
355 | bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
356 | rsv->mas.safe += mv->companion_mas.safe; | |
357 | rsv->mas.unsafe += mv->companion_mas.unsafe; | |
358 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
359 | break; | |
360 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
361 | bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
362 | rsv->needs_release_companion_mas = true; | |
363 | rsv->mas.safe = mv->final_mas.safe; | |
364 | rsv->mas.unsafe = mv->final_mas.unsafe; | |
365 | bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
366 | bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS); | |
367 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
368 | break; | |
8cc13a09 | 369 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
370 | case UWB_RSV_STATE_T_RESIZED: |
371 | rsv->needs_release_companion_mas = false; | |
8cc13a09 DV |
372 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
373 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
374 | uwb_rsv_callback(rsv); | |
375 | break; | |
376 | case UWB_RSV_STATE_T_DENIED: | |
377 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); | |
378 | break; | |
5b37717a SP |
379 | case UWB_RSV_STATE_T_CONFLICT: |
380 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT); | |
381 | break; | |
382 | case UWB_RSV_STATE_T_PENDING: | |
383 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING); | |
384 | break; | |
385 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
386 | rsv->needs_release_companion_mas = true; | |
387 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
388 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED); | |
389 | break; | |
8cc13a09 DV |
390 | default: |
391 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", | |
392 | uwb_rsv_state_str(new_state), new_state); | |
393 | } | |
394 | } | |
395 | ||
5b37717a SP |
396 | static void uwb_rsv_handle_timeout_work(struct work_struct *work) |
397 | { | |
398 | struct uwb_rsv *rsv = container_of(work, struct uwb_rsv, | |
399 | handle_timeout_work); | |
400 | struct uwb_rc *rc = rsv->rc; | |
401 | ||
402 | mutex_lock(&rc->rsvs_mutex); | |
403 | ||
404 | uwb_rsv_dump("TO", rsv); | |
405 | ||
406 | switch (rsv->state) { | |
407 | case UWB_RSV_STATE_O_INITIATED: | |
408 | if (rsv->is_multicast) { | |
409 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
410 | goto unlock; | |
411 | } | |
412 | break; | |
413 | case UWB_RSV_STATE_O_MOVE_EXPANDING: | |
414 | if (rsv->is_multicast) { | |
415 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
416 | goto unlock; | |
417 | } | |
418 | break; | |
419 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
420 | if (rsv->is_multicast) { | |
421 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
422 | goto unlock; | |
423 | } | |
424 | break; | |
425 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
426 | if (rsv->is_multicast) { | |
427 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
428 | goto unlock; | |
429 | } | |
430 | break; | |
431 | case UWB_RSV_STATE_O_ESTABLISHED: | |
432 | if (rsv->is_multicast) | |
433 | goto unlock; | |
434 | break; | |
435 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
436 | /* | |
437 | * The time out could be for the main or of the | |
438 | * companion DRP, assume it's for the companion and | |
439 | * drop that first. A further time out is required to | |
440 | * drop the main. | |
441 | */ | |
442 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
443 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
444 | goto unlock; | |
445 | default: | |
446 | break; | |
447 | } | |
448 | ||
449 | uwb_rsv_remove(rsv); | |
450 | ||
451 | unlock: | |
452 | mutex_unlock(&rc->rsvs_mutex); | |
453 | } | |
454 | ||
8cc13a09 DV |
455 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) |
456 | { | |
457 | struct uwb_rsv *rsv; | |
458 | ||
459 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); | |
460 | if (!rsv) | |
461 | return NULL; | |
462 | ||
463 | INIT_LIST_HEAD(&rsv->rc_node); | |
464 | INIT_LIST_HEAD(&rsv->pal_node); | |
cae1c114 | 465 | kref_init(&rsv->kref); |
8cc13a09 DV |
466 | init_timer(&rsv->timer); |
467 | rsv->timer.function = uwb_rsv_timer; | |
468 | rsv->timer.data = (unsigned long)rsv; | |
469 | ||
470 | rsv->rc = rc; | |
5b37717a | 471 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
8cc13a09 DV |
472 | |
473 | return rsv; | |
474 | } | |
475 | ||
8cc13a09 DV |
476 | /** |
477 | * uwb_rsv_create - allocate and initialize a UWB reservation structure | |
478 | * @rc: the radio controller | |
479 | * @cb: callback to use when the reservation completes or terminates | |
480 | * @pal_priv: data private to the PAL to be passed in the callback | |
481 | * | |
482 | * The callback is called when the state of the reservation changes from: | |
483 | * | |
484 | * - pending to accepted | |
485 | * - pending to denined | |
486 | * - accepted to terminated | |
487 | * - pending to terminated | |
488 | */ | |
489 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) | |
490 | { | |
491 | struct uwb_rsv *rsv; | |
492 | ||
493 | rsv = uwb_rsv_alloc(rc); | |
494 | if (!rsv) | |
495 | return NULL; | |
496 | ||
497 | rsv->callback = cb; | |
498 | rsv->pal_priv = pal_priv; | |
499 | ||
500 | return rsv; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(uwb_rsv_create); | |
503 | ||
504 | void uwb_rsv_remove(struct uwb_rsv *rsv) | |
505 | { | |
5b37717a SP |
506 | uwb_rsv_dump("RM", rsv); |
507 | ||
8cc13a09 DV |
508 | if (rsv->state != UWB_RSV_STATE_NONE) |
509 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
5b37717a SP |
510 | |
511 | if (rsv->needs_release_companion_mas) | |
512 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
513 | uwb_drp_avail_release(rsv->rc, &rsv->mas); | |
514 | ||
515 | if (uwb_rsv_is_owner(rsv)) | |
516 | uwb_rsv_put_stream(rsv); | |
2226b1c2 | 517 | |
cae1c114 DV |
518 | uwb_dev_put(rsv->owner); |
519 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
520 | uwb_dev_put(rsv->target.dev); | |
521 | ||
522 | list_del_init(&rsv->rc_node); | |
523 | uwb_rsv_put(rsv); | |
8cc13a09 DV |
524 | } |
525 | ||
526 | /** | |
527 | * uwb_rsv_destroy - free a UWB reservation structure | |
528 | * @rsv: the reservation to free | |
529 | * | |
cae1c114 | 530 | * The reservation must already be terminated. |
8cc13a09 DV |
531 | */ |
532 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
533 | { | |
cae1c114 | 534 | uwb_rsv_put(rsv); |
8cc13a09 DV |
535 | } |
536 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); | |
537 | ||
538 | /** | |
539 | * usb_rsv_establish - start a reservation establishment | |
540 | * @rsv: the reservation | |
541 | * | |
542 | * The PAL should fill in @rsv's owner, target, type, max_mas, | |
5b37717a | 543 | * min_mas, max_interval and is_multicast fields. If the target is a |
8cc13a09 DV |
544 | * uwb_dev it must be referenced. |
545 | * | |
546 | * The reservation's callback will be called when the reservation is | |
547 | * accepted, denied or times out. | |
548 | */ | |
549 | int uwb_rsv_establish(struct uwb_rsv *rsv) | |
550 | { | |
551 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 552 | struct uwb_mas_bm available; |
8cc13a09 DV |
553 | int ret; |
554 | ||
555 | mutex_lock(&rc->rsvs_mutex); | |
8cc13a09 DV |
556 | ret = uwb_rsv_get_stream(rsv); |
557 | if (ret) | |
558 | goto out; | |
559 | ||
5b37717a SP |
560 | rsv->tiebreaker = random32() & 1; |
561 | /* get available mas bitmap */ | |
562 | uwb_drp_available(rc, &available); | |
563 | ||
564 | ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas); | |
565 | if (ret == UWB_RSV_ALLOC_NOT_FOUND) { | |
566 | ret = -EBUSY; | |
567 | uwb_rsv_put_stream(rsv); | |
568 | goto out; | |
569 | } | |
570 | ||
571 | ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas); | |
572 | if (ret != 0) { | |
8cc13a09 DV |
573 | uwb_rsv_put_stream(rsv); |
574 | goto out; | |
575 | } | |
576 | ||
cae1c114 | 577 | uwb_rsv_get(rsv); |
8cc13a09 DV |
578 | list_add_tail(&rsv->rc_node, &rc->reservations); |
579 | rsv->owner = &rc->uwb_dev; | |
580 | uwb_dev_get(rsv->owner); | |
581 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); | |
582 | out: | |
583 | mutex_unlock(&rc->rsvs_mutex); | |
584 | return ret; | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); | |
587 | ||
588 | /** | |
589 | * uwb_rsv_modify - modify an already established reservation | |
590 | * @rsv: the reservation to modify | |
591 | * @max_mas: new maximum MAS to reserve | |
592 | * @min_mas: new minimum MAS to reserve | |
5b37717a | 593 | * @max_interval: new max_interval to use |
8cc13a09 DV |
594 | * |
595 | * FIXME: implement this once there are PALs that use it. | |
596 | */ | |
5b37717a | 597 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
8cc13a09 DV |
598 | { |
599 | return -ENOSYS; | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
602 | ||
5b37717a SP |
603 | /* |
604 | * move an already established reservation (rc->rsvs_mutex must to be | |
605 | * taken when tis function is called) | |
606 | */ | |
607 | int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available) | |
608 | { | |
609 | struct uwb_rc *rc = rsv->rc; | |
610 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
611 | struct device *dev = &rc->uwb_dev.dev; | |
612 | struct uwb_rsv_move *mv; | |
613 | int ret = 0; | |
614 | ||
615 | if (bow->can_reserve_extra_mases == false) | |
616 | return -EBUSY; | |
617 | ||
618 | mv = &rsv->mv; | |
619 | ||
620 | if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) { | |
621 | ||
622 | if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) { | |
623 | /* We want to move the reservation */ | |
624 | bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
625 | uwb_drp_avail_reserve_pending(rc, &mv->companion_mas); | |
626 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
627 | } | |
628 | } else { | |
629 | dev_dbg(dev, "new allocation not found\n"); | |
630 | } | |
631 | ||
632 | return ret; | |
633 | } | |
634 | ||
635 | /* It will try to move every reservation in state O_ESTABLISHED giving | |
636 | * to the MAS allocator algorithm an availability that is the real one | |
637 | * plus the allocation already established from the reservation. */ | |
638 | void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc) | |
639 | { | |
640 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
641 | struct uwb_rsv *rsv; | |
642 | struct uwb_mas_bm mas; | |
643 | ||
644 | if (bow->can_reserve_extra_mases == false) | |
645 | return; | |
646 | ||
647 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
648 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED || | |
649 | rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) { | |
650 | uwb_drp_available(rc, &mas); | |
651 | bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
652 | uwb_rsv_try_move(rsv, &mas); | |
653 | } | |
654 | } | |
655 | ||
656 | } | |
657 | ||
8cc13a09 DV |
658 | /** |
659 | * uwb_rsv_terminate - terminate an established reservation | |
660 | * @rsv: the reservation to terminate | |
661 | * | |
662 | * A reservation is terminated by removing the DRP IE from the beacon, | |
663 | * the other end will consider the reservation to be terminated when | |
664 | * it does not see the DRP IE for at least mMaxLostBeacons. | |
665 | * | |
666 | * If applicable, the reference to the target uwb_dev will be released. | |
667 | */ | |
668 | void uwb_rsv_terminate(struct uwb_rsv *rsv) | |
669 | { | |
670 | struct uwb_rc *rc = rsv->rc; | |
671 | ||
672 | mutex_lock(&rc->rsvs_mutex); | |
673 | ||
671e470e DV |
674 | if (rsv->state != UWB_RSV_STATE_NONE) |
675 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
8cc13a09 DV |
676 | |
677 | mutex_unlock(&rc->rsvs_mutex); | |
678 | } | |
679 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); | |
680 | ||
681 | /** | |
682 | * uwb_rsv_accept - accept a new reservation from a peer | |
683 | * @rsv: the reservation | |
684 | * @cb: call back for reservation changes | |
685 | * @pal_priv: data to be passed in the above call back | |
686 | * | |
687 | * Reservation requests from peers are denied unless a PAL accepts it | |
688 | * by calling this function. | |
cae1c114 DV |
689 | * |
690 | * The PAL call uwb_rsv_destroy() for all accepted reservations before | |
691 | * calling uwb_pal_unregister(). | |
8cc13a09 DV |
692 | */ |
693 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
694 | { | |
cae1c114 DV |
695 | uwb_rsv_get(rsv); |
696 | ||
8cc13a09 DV |
697 | rsv->callback = cb; |
698 | rsv->pal_priv = pal_priv; | |
699 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; | |
700 | } | |
701 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); | |
702 | ||
703 | /* | |
704 | * Is a received DRP IE for this reservation? | |
705 | */ | |
706 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, | |
707 | struct uwb_ie_drp *drp_ie) | |
708 | { | |
709 | struct uwb_dev_addr *rsv_src; | |
710 | int stream; | |
711 | ||
712 | stream = uwb_ie_drp_stream_index(drp_ie); | |
713 | ||
714 | if (rsv->stream != stream) | |
715 | return false; | |
716 | ||
717 | switch (rsv->target.type) { | |
718 | case UWB_RSV_TARGET_DEVADDR: | |
719 | return rsv->stream == stream; | |
720 | case UWB_RSV_TARGET_DEV: | |
721 | if (uwb_ie_drp_owner(drp_ie)) | |
722 | rsv_src = &rsv->owner->dev_addr; | |
723 | else | |
724 | rsv_src = &rsv->target.dev->dev_addr; | |
725 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; | |
726 | } | |
727 | return false; | |
728 | } | |
729 | ||
730 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, | |
731 | struct uwb_dev *src, | |
732 | struct uwb_ie_drp *drp_ie) | |
733 | { | |
734 | struct uwb_rsv *rsv; | |
735 | struct uwb_pal *pal; | |
736 | enum uwb_rsv_state state; | |
737 | ||
738 | rsv = uwb_rsv_alloc(rc); | |
739 | if (!rsv) | |
740 | return NULL; | |
741 | ||
742 | rsv->rc = rc; | |
743 | rsv->owner = src; | |
744 | uwb_dev_get(rsv->owner); | |
745 | rsv->target.type = UWB_RSV_TARGET_DEV; | |
746 | rsv->target.dev = &rc->uwb_dev; | |
5b37717a | 747 | uwb_dev_get(&rc->uwb_dev); |
8cc13a09 DV |
748 | rsv->type = uwb_ie_drp_type(drp_ie); |
749 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
8cc13a09 DV |
750 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); |
751 | ||
752 | /* | |
753 | * See if any PALs are interested in this reservation. If not, | |
754 | * deny the request. | |
755 | */ | |
756 | rsv->state = UWB_RSV_STATE_T_DENIED; | |
6fae35f9 | 757 | mutex_lock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
758 | list_for_each_entry(pal, &rc->pals, node) { |
759 | if (pal->new_rsv) | |
e17be2b2 | 760 | pal->new_rsv(pal, rsv); |
8cc13a09 DV |
761 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
762 | break; | |
763 | } | |
6fae35f9 | 764 | mutex_unlock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
765 | |
766 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
767 | state = rsv->state; | |
768 | rsv->state = UWB_RSV_STATE_NONE; | |
5b37717a SP |
769 | |
770 | /* FIXME: do something sensible here */ | |
771 | if (state == UWB_RSV_STATE_T_ACCEPTED | |
772 | && uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) { | |
773 | /* FIXME: do something sensible here */ | |
774 | } else { | |
775 | uwb_rsv_set_state(rsv, state); | |
776 | } | |
8cc13a09 DV |
777 | |
778 | return rsv; | |
779 | } | |
780 | ||
5b37717a SP |
781 | /** |
782 | * uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations | |
783 | * @rsv: the reservation. | |
784 | * @mas: returns the available MAS. | |
785 | * | |
786 | * The usable MAS of a reservation may be less than the negotiated MAS | |
787 | * if alien BPs are present. | |
788 | */ | |
789 | void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas) | |
790 | { | |
791 | bitmap_zero(mas->bm, UWB_NUM_MAS); | |
792 | bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS); | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas); | |
795 | ||
8cc13a09 DV |
796 | /** |
797 | * uwb_rsv_find - find a reservation for a received DRP IE. | |
798 | * @rc: the radio controller | |
799 | * @src: source of the DRP IE | |
800 | * @drp_ie: the DRP IE | |
801 | * | |
802 | * If the reservation cannot be found and the DRP IE is from a peer | |
803 | * attempting to establish a new reservation, create a new reservation | |
804 | * and add it to the list. | |
805 | */ | |
806 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, | |
807 | struct uwb_ie_drp *drp_ie) | |
808 | { | |
809 | struct uwb_rsv *rsv; | |
810 | ||
811 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
812 | if (uwb_rsv_match(rsv, src, drp_ie)) | |
813 | return rsv; | |
814 | } | |
815 | ||
816 | if (uwb_ie_drp_owner(drp_ie)) | |
817 | return uwb_rsv_new_target(rc, src, drp_ie); | |
818 | ||
819 | return NULL; | |
820 | } | |
821 | ||
822 | /* | |
823 | * Go through all the reservations and check for timeouts and (if | |
824 | * necessary) update their DRP IEs. | |
825 | * | |
826 | * FIXME: look at building the SET_DRP_IE command here rather than | |
827 | * having to rescan the list in uwb_rc_send_all_drp_ie(). | |
828 | */ | |
829 | static bool uwb_rsv_update_all(struct uwb_rc *rc) | |
830 | { | |
831 | struct uwb_rsv *rsv, *t; | |
832 | bool ie_updated = false; | |
833 | ||
834 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
8cc13a09 DV |
835 | if (!rsv->ie_valid) { |
836 | uwb_drp_ie_update(rsv); | |
837 | ie_updated = true; | |
838 | } | |
839 | } | |
840 | ||
841 | return ie_updated; | |
842 | } | |
843 | ||
5b37717a SP |
844 | void uwb_rsv_queue_update(struct uwb_rc *rc) |
845 | { | |
846 | unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; | |
847 | ||
848 | queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us)); | |
849 | } | |
850 | ||
851 | /** | |
852 | * uwb_rsv_sched_update - schedule an update of the DRP IEs | |
853 | * @rc: the radio controller. | |
854 | * | |
855 | * To improve performance and ensure correctness with [ECMA-368] the | |
856 | * number of SET-DRP-IE commands that are done are limited. | |
857 | * | |
858 | * DRP IEs update come from two sources: DRP events from the hardware | |
859 | * which all occur at the beginning of the superframe ('syncronous' | |
860 | * events) and reservation establishment/termination requests from | |
861 | * PALs or timers ('asynchronous' events). | |
862 | * | |
863 | * A delayed work ensures that all the synchronous events result in | |
864 | * one SET-DRP-IE command. | |
865 | * | |
866 | * Additional logic (the set_drp_ie_pending and rsv_updated_postponed | |
867 | * flags) will prevent an asynchrous event starting a SET-DRP-IE | |
868 | * command if one is currently awaiting a response. | |
869 | * | |
870 | * FIXME: this does leave a window where an asynchrous event can delay | |
871 | * the SET-DRP-IE for a synchronous event by one superframe. | |
872 | */ | |
8cc13a09 DV |
873 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
874 | { | |
8f5140a6 | 875 | spin_lock_bh(&rc->rsvs_lock); |
5b37717a SP |
876 | if (!delayed_work_pending(&rc->rsv_update_work)) { |
877 | if (rc->set_drp_ie_pending > 0) { | |
878 | rc->set_drp_ie_pending++; | |
879 | goto unlock; | |
880 | } | |
881 | uwb_rsv_queue_update(rc); | |
882 | } | |
883 | unlock: | |
8f5140a6 | 884 | spin_unlock_bh(&rc->rsvs_lock); |
8cc13a09 DV |
885 | } |
886 | ||
887 | /* | |
888 | * Update DRP IEs and, if necessary, the DRP Availability IE and send | |
889 | * the updated IEs to the radio controller. | |
890 | */ | |
891 | static void uwb_rsv_update_work(struct work_struct *work) | |
892 | { | |
5b37717a SP |
893 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
894 | rsv_update_work.work); | |
8cc13a09 DV |
895 | bool ie_updated; |
896 | ||
897 | mutex_lock(&rc->rsvs_mutex); | |
898 | ||
899 | ie_updated = uwb_rsv_update_all(rc); | |
900 | ||
901 | if (!rc->drp_avail.ie_valid) { | |
902 | uwb_drp_avail_ie_update(rc); | |
903 | ie_updated = true; | |
904 | } | |
905 | ||
5b37717a | 906 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
8cc13a09 DV |
907 | uwb_rc_send_all_drp_ie(rc); |
908 | ||
909 | mutex_unlock(&rc->rsvs_mutex); | |
910 | } | |
911 | ||
5b37717a SP |
912 | static void uwb_rsv_alien_bp_work(struct work_struct *work) |
913 | { | |
914 | struct uwb_rc *rc = container_of(work, struct uwb_rc, | |
915 | rsv_alien_bp_work.work); | |
916 | struct uwb_rsv *rsv; | |
917 | ||
918 | mutex_lock(&rc->rsvs_mutex); | |
919 | ||
920 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
921 | if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) { | |
922 | rsv->callback(rsv); | |
923 | } | |
924 | } | |
925 | ||
926 | mutex_unlock(&rc->rsvs_mutex); | |
927 | } | |
928 | ||
8cc13a09 DV |
929 | static void uwb_rsv_timer(unsigned long arg) |
930 | { | |
931 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; | |
932 | ||
5b37717a | 933 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
8cc13a09 DV |
934 | } |
935 | ||
307ba6dd DV |
936 | /** |
937 | * uwb_rsv_remove_all - remove all reservations | |
938 | * @rc: the radio controller | |
939 | * | |
940 | * A DRP IE update is not done. | |
941 | */ | |
942 | void uwb_rsv_remove_all(struct uwb_rc *rc) | |
943 | { | |
944 | struct uwb_rsv *rsv, *t; | |
945 | ||
946 | mutex_lock(&rc->rsvs_mutex); | |
947 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
2226b1c2 DV |
948 | if (rsv->state != UWB_RSV_STATE_NONE) |
949 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
950 | del_timer_sync(&rsv->timer); | |
307ba6dd | 951 | } |
5b37717a SP |
952 | /* Cancel any postponed update. */ |
953 | rc->set_drp_ie_pending = 0; | |
307ba6dd DV |
954 | mutex_unlock(&rc->rsvs_mutex); |
955 | ||
5b37717a | 956 | cancel_delayed_work_sync(&rc->rsv_update_work); |
2226b1c2 DV |
957 | flush_workqueue(rc->rsv_workq); |
958 | ||
959 | mutex_lock(&rc->rsvs_mutex); | |
960 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
961 | uwb_rsv_remove(rsv); | |
962 | } | |
963 | mutex_unlock(&rc->rsvs_mutex); | |
307ba6dd DV |
964 | } |
965 | ||
8cc13a09 DV |
966 | void uwb_rsv_init(struct uwb_rc *rc) |
967 | { | |
968 | INIT_LIST_HEAD(&rc->reservations); | |
5b37717a | 969 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
8cc13a09 | 970 | mutex_init(&rc->rsvs_mutex); |
5b37717a SP |
971 | spin_lock_init(&rc->rsvs_lock); |
972 | INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work); | |
973 | INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work); | |
974 | rc->bow.can_reserve_extra_mases = true; | |
975 | rc->bow.total_expired = 0; | |
976 | rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
977 | init_timer(&rc->bow.timer); | |
978 | rc->bow.timer.function = uwb_rsv_backoff_win_timer; | |
979 | rc->bow.timer.data = (unsigned long)&rc->bow; | |
8cc13a09 DV |
980 | |
981 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); | |
982 | } | |
983 | ||
984 | int uwb_rsv_setup(struct uwb_rc *rc) | |
985 | { | |
986 | char name[16]; | |
987 | ||
988 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); | |
989 | rc->rsv_workq = create_singlethread_workqueue(name); | |
990 | if (rc->rsv_workq == NULL) | |
991 | return -ENOMEM; | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | void uwb_rsv_cleanup(struct uwb_rc *rc) | |
997 | { | |
307ba6dd | 998 | uwb_rsv_remove_all(rc); |
8cc13a09 DV |
999 | destroy_workqueue(rc->rsv_workq); |
1000 | } |