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Commit | Line | Data |
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75471687 TB |
1 | /* |
2 | * Tegra host1x Syncpoints | |
3 | * | |
d4b57818 | 4 | * Copyright (c) 2010-2015, NVIDIA Corporation. |
75471687 TB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * 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 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #include <trace/events/host1x.h> | |
24 | ||
25 | #include "syncpt.h" | |
26 | #include "dev.h" | |
7ede0b0b | 27 | #include "intr.h" |
6236451d | 28 | #include "debug.h" |
7ede0b0b TB |
29 | |
30 | #define SYNCPT_CHECK_PERIOD (2 * HZ) | |
31 | #define MAX_STUCK_CHECK_COUNT 15 | |
75471687 | 32 | |
f5a954fe AM |
33 | static struct host1x_syncpt_base * |
34 | host1x_syncpt_base_request(struct host1x *host) | |
35 | { | |
36 | struct host1x_syncpt_base *bases = host->bases; | |
37 | unsigned int i; | |
38 | ||
39 | for (i = 0; i < host->info->nb_bases; i++) | |
40 | if (!bases[i].requested) | |
41 | break; | |
42 | ||
43 | if (i >= host->info->nb_bases) | |
44 | return NULL; | |
45 | ||
46 | bases[i].requested = true; | |
47 | return &bases[i]; | |
48 | } | |
49 | ||
50 | static void host1x_syncpt_base_free(struct host1x_syncpt_base *base) | |
51 | { | |
52 | if (base) | |
53 | base->requested = false; | |
54 | } | |
55 | ||
8736fe81 AM |
56 | static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host, |
57 | struct device *dev, | |
58 | unsigned long flags) | |
75471687 TB |
59 | { |
60 | int i; | |
61 | struct host1x_syncpt *sp = host->syncpt; | |
62 | char *name; | |
63 | ||
d4b57818 AM |
64 | mutex_lock(&host->syncpt_mutex); |
65 | ||
75471687 TB |
66 | for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++) |
67 | ; | |
edeabfcb AM |
68 | |
69 | if (i >= host->info->nb_pts) | |
d4b57818 | 70 | goto unlock; |
75471687 | 71 | |
f5a954fe AM |
72 | if (flags & HOST1X_SYNCPT_HAS_BASE) { |
73 | sp->base = host1x_syncpt_base_request(host); | |
74 | if (!sp->base) | |
d4b57818 | 75 | goto unlock; |
f5a954fe AM |
76 | } |
77 | ||
5c0d8d38 | 78 | name = kasprintf(GFP_KERNEL, "%02u-%s", sp->id, |
75471687 TB |
79 | dev ? dev_name(dev) : NULL); |
80 | if (!name) | |
d4b57818 | 81 | goto free_base; |
75471687 TB |
82 | |
83 | sp->dev = dev; | |
84 | sp->name = name; | |
8736fe81 AM |
85 | |
86 | if (flags & HOST1X_SYNCPT_CLIENT_MANAGED) | |
87 | sp->client_managed = true; | |
88 | else | |
89 | sp->client_managed = false; | |
75471687 | 90 | |
d4b57818 | 91 | mutex_unlock(&host->syncpt_mutex); |
75471687 | 92 | return sp; |
d4b57818 AM |
93 | |
94 | free_base: | |
95 | host1x_syncpt_base_free(sp->base); | |
96 | sp->base = NULL; | |
97 | unlock: | |
98 | mutex_unlock(&host->syncpt_mutex); | |
99 | return NULL; | |
75471687 TB |
100 | } |
101 | ||
102 | u32 host1x_syncpt_id(struct host1x_syncpt *sp) | |
103 | { | |
104 | return sp->id; | |
105 | } | |
fae798a1 | 106 | EXPORT_SYMBOL(host1x_syncpt_id); |
75471687 TB |
107 | |
108 | /* | |
109 | * Updates the value sent to hardware. | |
110 | */ | |
111 | u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) | |
112 | { | |
113 | return (u32)atomic_add_return(incrs, &sp->max_val); | |
114 | } | |
64400c37 | 115 | EXPORT_SYMBOL(host1x_syncpt_incr_max); |
75471687 TB |
116 | |
117 | /* | |
118 | * Write cached syncpoint and waitbase values to hardware. | |
119 | */ | |
120 | void host1x_syncpt_restore(struct host1x *host) | |
121 | { | |
122 | struct host1x_syncpt *sp_base = host->syncpt; | |
14c95fc8 | 123 | unsigned int i; |
75471687 TB |
124 | |
125 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) | |
126 | host1x_hw_syncpt_restore(host, sp_base + i); | |
0b8070d1 | 127 | |
75471687 TB |
128 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) |
129 | host1x_hw_syncpt_restore_wait_base(host, sp_base + i); | |
0b8070d1 | 130 | |
75471687 TB |
131 | wmb(); |
132 | } | |
133 | ||
134 | /* | |
135 | * Update the cached syncpoint and waitbase values by reading them | |
136 | * from the registers. | |
137 | */ | |
138 | void host1x_syncpt_save(struct host1x *host) | |
139 | { | |
140 | struct host1x_syncpt *sp_base = host->syncpt; | |
14c95fc8 | 141 | unsigned int i; |
75471687 TB |
142 | |
143 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) { | |
144 | if (host1x_syncpt_client_managed(sp_base + i)) | |
145 | host1x_hw_syncpt_load(host, sp_base + i); | |
146 | else | |
147 | WARN_ON(!host1x_syncpt_idle(sp_base + i)); | |
148 | } | |
149 | ||
150 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) | |
151 | host1x_hw_syncpt_load_wait_base(host, sp_base + i); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Updates the cached syncpoint value by reading a new value from the hardware | |
156 | * register | |
157 | */ | |
158 | u32 host1x_syncpt_load(struct host1x_syncpt *sp) | |
159 | { | |
160 | u32 val; | |
6df633d0 | 161 | |
75471687 TB |
162 | val = host1x_hw_syncpt_load(sp->host, sp); |
163 | trace_host1x_syncpt_load_min(sp->id, val); | |
164 | ||
165 | return val; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Get the current syncpoint base | |
170 | */ | |
171 | u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp) | |
172 | { | |
75471687 | 173 | host1x_hw_syncpt_load_wait_base(sp->host, sp); |
4b92e294 TR |
174 | |
175 | return sp->base_val; | |
75471687 TB |
176 | } |
177 | ||
75471687 TB |
178 | /* |
179 | * Increment syncpoint value from cpu, updating cache | |
180 | */ | |
ebae30b1 | 181 | int host1x_syncpt_incr(struct host1x_syncpt *sp) |
75471687 | 182 | { |
ebae30b1 | 183 | return host1x_hw_syncpt_cpu_incr(sp->host, sp); |
75471687 | 184 | } |
fae798a1 | 185 | EXPORT_SYMBOL(host1x_syncpt_incr); |
75471687 | 186 | |
7ede0b0b TB |
187 | /* |
188 | * Updated sync point form hardware, and returns true if syncpoint is expired, | |
189 | * false if we may need to wait | |
190 | */ | |
191 | static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh) | |
192 | { | |
193 | host1x_hw_syncpt_load(sp->host, sp); | |
0b8070d1 | 194 | |
7ede0b0b TB |
195 | return host1x_syncpt_is_expired(sp, thresh); |
196 | } | |
197 | ||
198 | /* | |
199 | * Main entrypoint for syncpoint value waits. | |
200 | */ | |
201 | int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout, | |
0b8070d1 | 202 | u32 *value) |
7ede0b0b TB |
203 | { |
204 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); | |
205 | void *ref; | |
206 | struct host1x_waitlist *waiter; | |
207 | int err = 0, check_count = 0; | |
208 | u32 val; | |
209 | ||
210 | if (value) | |
211 | *value = 0; | |
212 | ||
213 | /* first check cache */ | |
214 | if (host1x_syncpt_is_expired(sp, thresh)) { | |
215 | if (value) | |
216 | *value = host1x_syncpt_load(sp); | |
0b8070d1 | 217 | |
7ede0b0b TB |
218 | return 0; |
219 | } | |
220 | ||
221 | /* try to read from register */ | |
222 | val = host1x_hw_syncpt_load(sp->host, sp); | |
223 | if (host1x_syncpt_is_expired(sp, thresh)) { | |
224 | if (value) | |
225 | *value = val; | |
0b8070d1 | 226 | |
7ede0b0b TB |
227 | goto done; |
228 | } | |
229 | ||
230 | if (!timeout) { | |
231 | err = -EAGAIN; | |
232 | goto done; | |
233 | } | |
234 | ||
235 | /* allocate a waiter */ | |
236 | waiter = kzalloc(sizeof(*waiter), GFP_KERNEL); | |
237 | if (!waiter) { | |
238 | err = -ENOMEM; | |
239 | goto done; | |
240 | } | |
241 | ||
242 | /* schedule a wakeup when the syncpoint value is reached */ | |
243 | err = host1x_intr_add_action(sp->host, sp->id, thresh, | |
244 | HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE, | |
245 | &wq, waiter, &ref); | |
246 | if (err) | |
247 | goto done; | |
248 | ||
249 | err = -EAGAIN; | |
250 | /* Caller-specified timeout may be impractically low */ | |
251 | if (timeout < 0) | |
252 | timeout = LONG_MAX; | |
253 | ||
254 | /* wait for the syncpoint, or timeout, or signal */ | |
255 | while (timeout) { | |
256 | long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout); | |
0b8070d1 TR |
257 | int remain; |
258 | ||
259 | remain = wait_event_interruptible_timeout(wq, | |
7ede0b0b TB |
260 | syncpt_load_min_is_expired(sp, thresh), |
261 | check); | |
262 | if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) { | |
263 | if (value) | |
264 | *value = host1x_syncpt_load(sp); | |
0b8070d1 | 265 | |
7ede0b0b | 266 | err = 0; |
0b8070d1 | 267 | |
7ede0b0b TB |
268 | break; |
269 | } | |
0b8070d1 | 270 | |
7ede0b0b TB |
271 | if (remain < 0) { |
272 | err = remain; | |
273 | break; | |
274 | } | |
0b8070d1 | 275 | |
7ede0b0b | 276 | timeout -= check; |
0b8070d1 | 277 | |
7ede0b0b TB |
278 | if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) { |
279 | dev_warn(sp->host->dev, | |
5c0d8d38 | 280 | "%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n", |
7ede0b0b TB |
281 | current->comm, sp->id, sp->name, |
282 | thresh, timeout); | |
6236451d TB |
283 | |
284 | host1x_debug_dump_syncpts(sp->host); | |
0b8070d1 | 285 | |
6236451d TB |
286 | if (check_count == MAX_STUCK_CHECK_COUNT) |
287 | host1x_debug_dump(sp->host); | |
0b8070d1 | 288 | |
7ede0b0b TB |
289 | check_count++; |
290 | } | |
291 | } | |
0b8070d1 | 292 | |
7ede0b0b TB |
293 | host1x_intr_put_ref(sp->host, sp->id, ref); |
294 | ||
295 | done: | |
296 | return err; | |
297 | } | |
298 | EXPORT_SYMBOL(host1x_syncpt_wait); | |
299 | ||
300 | /* | |
301 | * Returns true if syncpoint is expired, false if we may need to wait | |
302 | */ | |
303 | bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh) | |
304 | { | |
305 | u32 current_val; | |
306 | u32 future_val; | |
6df633d0 | 307 | |
7ede0b0b | 308 | smp_rmb(); |
0b8070d1 | 309 | |
7ede0b0b TB |
310 | current_val = (u32)atomic_read(&sp->min_val); |
311 | future_val = (u32)atomic_read(&sp->max_val); | |
312 | ||
313 | /* Note the use of unsigned arithmetic here (mod 1<<32). | |
314 | * | |
315 | * c = current_val = min_val = the current value of the syncpoint. | |
316 | * t = thresh = the value we are checking | |
317 | * f = future_val = max_val = the value c will reach when all | |
318 | * outstanding increments have completed. | |
319 | * | |
320 | * Note that c always chases f until it reaches f. | |
321 | * | |
322 | * Dtf = (f - t) | |
323 | * Dtc = (c - t) | |
324 | * | |
325 | * Consider all cases: | |
326 | * | |
327 | * A) .....c..t..f..... Dtf < Dtc need to wait | |
328 | * B) .....c.....f..t.. Dtf > Dtc expired | |
329 | * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large) | |
330 | * | |
331 | * Any case where f==c: always expired (for any t). Dtf == Dcf | |
332 | * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0) | |
333 | * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0, | |
334 | * Dtc!=0) | |
335 | * | |
336 | * Other cases: | |
337 | * | |
338 | * A) .....t..f..c..... Dtf < Dtc need to wait | |
339 | * A) .....f..c..t..... Dtf < Dtc need to wait | |
340 | * A) .....f..t..c..... Dtf > Dtc expired | |
341 | * | |
342 | * So: | |
343 | * Dtf >= Dtc implies EXPIRED (return true) | |
344 | * Dtf < Dtc implies WAIT (return false) | |
345 | * | |
346 | * Note: If t is expired then we *cannot* wait on it. We would wait | |
347 | * forever (hang the system). | |
348 | * | |
349 | * Note: do NOT get clever and remove the -thresh from both sides. It | |
350 | * is NOT the same. | |
351 | * | |
352 | * If future valueis zero, we have a client managed sync point. In that | |
353 | * case we do a direct comparison. | |
354 | */ | |
355 | if (!host1x_syncpt_client_managed(sp)) | |
356 | return future_val - thresh >= current_val - thresh; | |
357 | else | |
358 | return (s32)(current_val - thresh) >= 0; | |
359 | } | |
360 | ||
6579324a TB |
361 | /* remove a wait pointed to by patch_addr */ |
362 | int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr) | |
363 | { | |
364 | return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr); | |
365 | } | |
366 | ||
75471687 TB |
367 | int host1x_syncpt_init(struct host1x *host) |
368 | { | |
f5a954fe | 369 | struct host1x_syncpt_base *bases; |
75471687 | 370 | struct host1x_syncpt *syncpt; |
14c95fc8 | 371 | unsigned int i; |
75471687 | 372 | |
b47a0491 | 373 | syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt), |
f5a954fe | 374 | GFP_KERNEL); |
75471687 TB |
375 | if (!syncpt) |
376 | return -ENOMEM; | |
377 | ||
b47a0491 | 378 | bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases), |
f5a954fe AM |
379 | GFP_KERNEL); |
380 | if (!bases) | |
381 | return -ENOMEM; | |
382 | ||
383 | for (i = 0; i < host->info->nb_pts; i++) { | |
75471687 TB |
384 | syncpt[i].id = i; |
385 | syncpt[i].host = host; | |
386 | } | |
387 | ||
f5a954fe AM |
388 | for (i = 0; i < host->info->nb_bases; i++) |
389 | bases[i].id = i; | |
390 | ||
d4b57818 | 391 | mutex_init(&host->syncpt_mutex); |
75471687 | 392 | host->syncpt = syncpt; |
f5a954fe | 393 | host->bases = bases; |
75471687 TB |
394 | |
395 | host1x_syncpt_restore(host); | |
396 | ||
6579324a | 397 | /* Allocate sync point to use for clearing waits for expired fences */ |
8736fe81 | 398 | host->nop_sp = host1x_syncpt_alloc(host, NULL, 0); |
6579324a TB |
399 | if (!host->nop_sp) |
400 | return -ENOMEM; | |
401 | ||
75471687 TB |
402 | return 0; |
403 | } | |
404 | ||
405 | struct host1x_syncpt *host1x_syncpt_request(struct device *dev, | |
8736fe81 | 406 | unsigned long flags) |
75471687 TB |
407 | { |
408 | struct host1x *host = dev_get_drvdata(dev->parent); | |
0b8070d1 | 409 | |
8736fe81 | 410 | return host1x_syncpt_alloc(host, dev, flags); |
75471687 | 411 | } |
fae798a1 | 412 | EXPORT_SYMBOL(host1x_syncpt_request); |
75471687 TB |
413 | |
414 | void host1x_syncpt_free(struct host1x_syncpt *sp) | |
415 | { | |
416 | if (!sp) | |
417 | return; | |
418 | ||
d4b57818 AM |
419 | mutex_lock(&sp->host->syncpt_mutex); |
420 | ||
f5a954fe | 421 | host1x_syncpt_base_free(sp->base); |
75471687 | 422 | kfree(sp->name); |
f5a954fe | 423 | sp->base = NULL; |
75471687 TB |
424 | sp->dev = NULL; |
425 | sp->name = NULL; | |
ece66891 | 426 | sp->client_managed = false; |
d4b57818 AM |
427 | |
428 | mutex_unlock(&sp->host->syncpt_mutex); | |
75471687 | 429 | } |
fae798a1 | 430 | EXPORT_SYMBOL(host1x_syncpt_free); |
75471687 TB |
431 | |
432 | void host1x_syncpt_deinit(struct host1x *host) | |
433 | { | |
75471687 | 434 | struct host1x_syncpt *sp = host->syncpt; |
14c95fc8 TR |
435 | unsigned int i; |
436 | ||
75471687 TB |
437 | for (i = 0; i < host->info->nb_pts; i++, sp++) |
438 | kfree(sp->name); | |
439 | } | |
440 | ||
35d747a8 TR |
441 | /* |
442 | * Read max. It indicates how many operations there are in queue, either in | |
443 | * channel or in a software thread. | |
6df633d0 | 444 | */ |
35d747a8 TR |
445 | u32 host1x_syncpt_read_max(struct host1x_syncpt *sp) |
446 | { | |
447 | smp_rmb(); | |
0b8070d1 | 448 | |
35d747a8 TR |
449 | return (u32)atomic_read(&sp->max_val); |
450 | } | |
fae798a1 | 451 | EXPORT_SYMBOL(host1x_syncpt_read_max); |
35d747a8 TR |
452 | |
453 | /* | |
454 | * Read min, which is a shadow of the current sync point value in hardware. | |
455 | */ | |
456 | u32 host1x_syncpt_read_min(struct host1x_syncpt *sp) | |
457 | { | |
458 | smp_rmb(); | |
0b8070d1 | 459 | |
35d747a8 TR |
460 | return (u32)atomic_read(&sp->min_val); |
461 | } | |
fae798a1 | 462 | EXPORT_SYMBOL(host1x_syncpt_read_min); |
35d747a8 | 463 | |
b4a20144 TR |
464 | u32 host1x_syncpt_read(struct host1x_syncpt *sp) |
465 | { | |
466 | return host1x_syncpt_load(sp); | |
467 | } | |
468 | EXPORT_SYMBOL(host1x_syncpt_read); | |
469 | ||
14c95fc8 | 470 | unsigned int host1x_syncpt_nb_pts(struct host1x *host) |
75471687 TB |
471 | { |
472 | return host->info->nb_pts; | |
473 | } | |
474 | ||
14c95fc8 | 475 | unsigned int host1x_syncpt_nb_bases(struct host1x *host) |
75471687 TB |
476 | { |
477 | return host->info->nb_bases; | |
478 | } | |
479 | ||
14c95fc8 | 480 | unsigned int host1x_syncpt_nb_mlocks(struct host1x *host) |
75471687 TB |
481 | { |
482 | return host->info->nb_mlocks; | |
483 | } | |
484 | ||
5c0d8d38 | 485 | struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, unsigned int id) |
75471687 TB |
486 | { |
487 | if (host->info->nb_pts < id) | |
488 | return NULL; | |
0b8070d1 | 489 | |
75471687 TB |
490 | return host->syncpt + id; |
491 | } | |
fae798a1 | 492 | EXPORT_SYMBOL(host1x_syncpt_get); |
f5a954fe AM |
493 | |
494 | struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp) | |
495 | { | |
496 | return sp ? sp->base : NULL; | |
497 | } | |
fae798a1 | 498 | EXPORT_SYMBOL(host1x_syncpt_get_base); |
f5a954fe AM |
499 | |
500 | u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base) | |
501 | { | |
502 | return base->id; | |
503 | } | |
fae798a1 | 504 | EXPORT_SYMBOL(host1x_syncpt_base_id); |