Commit | Line | Data |
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75471687 TB |
1 | /* |
2 | * Tegra host1x Syncpoints | |
3 | * | |
4 | * Copyright (c) 2010-2013, NVIDIA Corporation. | |
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 | ||
64 | for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++) | |
65 | ; | |
edeabfcb AM |
66 | |
67 | if (i >= host->info->nb_pts) | |
75471687 TB |
68 | return NULL; |
69 | ||
f5a954fe AM |
70 | if (flags & HOST1X_SYNCPT_HAS_BASE) { |
71 | sp->base = host1x_syncpt_base_request(host); | |
72 | if (!sp->base) | |
73 | return NULL; | |
74 | } | |
75 | ||
75471687 TB |
76 | name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id, |
77 | dev ? dev_name(dev) : NULL); | |
78 | if (!name) | |
79 | return NULL; | |
80 | ||
81 | sp->dev = dev; | |
82 | sp->name = name; | |
8736fe81 AM |
83 | |
84 | if (flags & HOST1X_SYNCPT_CLIENT_MANAGED) | |
85 | sp->client_managed = true; | |
86 | else | |
87 | sp->client_managed = false; | |
75471687 TB |
88 | |
89 | return sp; | |
90 | } | |
91 | ||
92 | u32 host1x_syncpt_id(struct host1x_syncpt *sp) | |
93 | { | |
94 | return sp->id; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Updates the value sent to hardware. | |
99 | */ | |
100 | u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) | |
101 | { | |
102 | return (u32)atomic_add_return(incrs, &sp->max_val); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Write cached syncpoint and waitbase values to hardware. | |
107 | */ | |
108 | void host1x_syncpt_restore(struct host1x *host) | |
109 | { | |
110 | struct host1x_syncpt *sp_base = host->syncpt; | |
111 | u32 i; | |
112 | ||
113 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) | |
114 | host1x_hw_syncpt_restore(host, sp_base + i); | |
115 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) | |
116 | host1x_hw_syncpt_restore_wait_base(host, sp_base + i); | |
117 | wmb(); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Update the cached syncpoint and waitbase values by reading them | |
122 | * from the registers. | |
123 | */ | |
124 | void host1x_syncpt_save(struct host1x *host) | |
125 | { | |
126 | struct host1x_syncpt *sp_base = host->syncpt; | |
127 | u32 i; | |
128 | ||
129 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) { | |
130 | if (host1x_syncpt_client_managed(sp_base + i)) | |
131 | host1x_hw_syncpt_load(host, sp_base + i); | |
132 | else | |
133 | WARN_ON(!host1x_syncpt_idle(sp_base + i)); | |
134 | } | |
135 | ||
136 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) | |
137 | host1x_hw_syncpt_load_wait_base(host, sp_base + i); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Updates the cached syncpoint value by reading a new value from the hardware | |
142 | * register | |
143 | */ | |
144 | u32 host1x_syncpt_load(struct host1x_syncpt *sp) | |
145 | { | |
146 | u32 val; | |
147 | val = host1x_hw_syncpt_load(sp->host, sp); | |
148 | trace_host1x_syncpt_load_min(sp->id, val); | |
149 | ||
150 | return val; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Get the current syncpoint base | |
155 | */ | |
156 | u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp) | |
157 | { | |
158 | u32 val; | |
159 | host1x_hw_syncpt_load_wait_base(sp->host, sp); | |
160 | val = sp->base_val; | |
161 | return val; | |
162 | } | |
163 | ||
75471687 TB |
164 | /* |
165 | * Increment syncpoint value from cpu, updating cache | |
166 | */ | |
ebae30b1 | 167 | int host1x_syncpt_incr(struct host1x_syncpt *sp) |
75471687 | 168 | { |
ebae30b1 | 169 | return host1x_hw_syncpt_cpu_incr(sp->host, sp); |
75471687 TB |
170 | } |
171 | ||
7ede0b0b TB |
172 | /* |
173 | * Updated sync point form hardware, and returns true if syncpoint is expired, | |
174 | * false if we may need to wait | |
175 | */ | |
176 | static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh) | |
177 | { | |
178 | host1x_hw_syncpt_load(sp->host, sp); | |
179 | return host1x_syncpt_is_expired(sp, thresh); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Main entrypoint for syncpoint value waits. | |
184 | */ | |
185 | int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout, | |
186 | u32 *value) | |
187 | { | |
188 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); | |
189 | void *ref; | |
190 | struct host1x_waitlist *waiter; | |
191 | int err = 0, check_count = 0; | |
192 | u32 val; | |
193 | ||
194 | if (value) | |
195 | *value = 0; | |
196 | ||
197 | /* first check cache */ | |
198 | if (host1x_syncpt_is_expired(sp, thresh)) { | |
199 | if (value) | |
200 | *value = host1x_syncpt_load(sp); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* try to read from register */ | |
205 | val = host1x_hw_syncpt_load(sp->host, sp); | |
206 | if (host1x_syncpt_is_expired(sp, thresh)) { | |
207 | if (value) | |
208 | *value = val; | |
209 | goto done; | |
210 | } | |
211 | ||
212 | if (!timeout) { | |
213 | err = -EAGAIN; | |
214 | goto done; | |
215 | } | |
216 | ||
217 | /* allocate a waiter */ | |
218 | waiter = kzalloc(sizeof(*waiter), GFP_KERNEL); | |
219 | if (!waiter) { | |
220 | err = -ENOMEM; | |
221 | goto done; | |
222 | } | |
223 | ||
224 | /* schedule a wakeup when the syncpoint value is reached */ | |
225 | err = host1x_intr_add_action(sp->host, sp->id, thresh, | |
226 | HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE, | |
227 | &wq, waiter, &ref); | |
228 | if (err) | |
229 | goto done; | |
230 | ||
231 | err = -EAGAIN; | |
232 | /* Caller-specified timeout may be impractically low */ | |
233 | if (timeout < 0) | |
234 | timeout = LONG_MAX; | |
235 | ||
236 | /* wait for the syncpoint, or timeout, or signal */ | |
237 | while (timeout) { | |
238 | long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout); | |
239 | int remain = wait_event_interruptible_timeout(wq, | |
240 | syncpt_load_min_is_expired(sp, thresh), | |
241 | check); | |
242 | if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) { | |
243 | if (value) | |
244 | *value = host1x_syncpt_load(sp); | |
245 | err = 0; | |
246 | break; | |
247 | } | |
248 | if (remain < 0) { | |
249 | err = remain; | |
250 | break; | |
251 | } | |
252 | timeout -= check; | |
253 | if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) { | |
254 | dev_warn(sp->host->dev, | |
255 | "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n", | |
256 | current->comm, sp->id, sp->name, | |
257 | thresh, timeout); | |
6236451d TB |
258 | |
259 | host1x_debug_dump_syncpts(sp->host); | |
260 | if (check_count == MAX_STUCK_CHECK_COUNT) | |
261 | host1x_debug_dump(sp->host); | |
7ede0b0b TB |
262 | check_count++; |
263 | } | |
264 | } | |
265 | host1x_intr_put_ref(sp->host, sp->id, ref); | |
266 | ||
267 | done: | |
268 | return err; | |
269 | } | |
270 | EXPORT_SYMBOL(host1x_syncpt_wait); | |
271 | ||
272 | /* | |
273 | * Returns true if syncpoint is expired, false if we may need to wait | |
274 | */ | |
275 | bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh) | |
276 | { | |
277 | u32 current_val; | |
278 | u32 future_val; | |
279 | smp_rmb(); | |
280 | current_val = (u32)atomic_read(&sp->min_val); | |
281 | future_val = (u32)atomic_read(&sp->max_val); | |
282 | ||
283 | /* Note the use of unsigned arithmetic here (mod 1<<32). | |
284 | * | |
285 | * c = current_val = min_val = the current value of the syncpoint. | |
286 | * t = thresh = the value we are checking | |
287 | * f = future_val = max_val = the value c will reach when all | |
288 | * outstanding increments have completed. | |
289 | * | |
290 | * Note that c always chases f until it reaches f. | |
291 | * | |
292 | * Dtf = (f - t) | |
293 | * Dtc = (c - t) | |
294 | * | |
295 | * Consider all cases: | |
296 | * | |
297 | * A) .....c..t..f..... Dtf < Dtc need to wait | |
298 | * B) .....c.....f..t.. Dtf > Dtc expired | |
299 | * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large) | |
300 | * | |
301 | * Any case where f==c: always expired (for any t). Dtf == Dcf | |
302 | * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0) | |
303 | * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0, | |
304 | * Dtc!=0) | |
305 | * | |
306 | * Other cases: | |
307 | * | |
308 | * A) .....t..f..c..... Dtf < Dtc need to wait | |
309 | * A) .....f..c..t..... Dtf < Dtc need to wait | |
310 | * A) .....f..t..c..... Dtf > Dtc expired | |
311 | * | |
312 | * So: | |
313 | * Dtf >= Dtc implies EXPIRED (return true) | |
314 | * Dtf < Dtc implies WAIT (return false) | |
315 | * | |
316 | * Note: If t is expired then we *cannot* wait on it. We would wait | |
317 | * forever (hang the system). | |
318 | * | |
319 | * Note: do NOT get clever and remove the -thresh from both sides. It | |
320 | * is NOT the same. | |
321 | * | |
322 | * If future valueis zero, we have a client managed sync point. In that | |
323 | * case we do a direct comparison. | |
324 | */ | |
325 | if (!host1x_syncpt_client_managed(sp)) | |
326 | return future_val - thresh >= current_val - thresh; | |
327 | else | |
328 | return (s32)(current_val - thresh) >= 0; | |
329 | } | |
330 | ||
6579324a TB |
331 | /* remove a wait pointed to by patch_addr */ |
332 | int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr) | |
333 | { | |
334 | return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr); | |
335 | } | |
336 | ||
75471687 TB |
337 | int host1x_syncpt_init(struct host1x *host) |
338 | { | |
f5a954fe | 339 | struct host1x_syncpt_base *bases; |
75471687 TB |
340 | struct host1x_syncpt *syncpt; |
341 | int i; | |
342 | ||
343 | syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts, | |
f5a954fe | 344 | GFP_KERNEL); |
75471687 TB |
345 | if (!syncpt) |
346 | return -ENOMEM; | |
347 | ||
f5a954fe AM |
348 | bases = devm_kzalloc(host->dev, sizeof(*bases) * host->info->nb_bases, |
349 | GFP_KERNEL); | |
350 | if (!bases) | |
351 | return -ENOMEM; | |
352 | ||
353 | for (i = 0; i < host->info->nb_pts; i++) { | |
75471687 TB |
354 | syncpt[i].id = i; |
355 | syncpt[i].host = host; | |
356 | } | |
357 | ||
f5a954fe AM |
358 | for (i = 0; i < host->info->nb_bases; i++) |
359 | bases[i].id = i; | |
360 | ||
75471687 | 361 | host->syncpt = syncpt; |
f5a954fe | 362 | host->bases = bases; |
75471687 TB |
363 | |
364 | host1x_syncpt_restore(host); | |
365 | ||
6579324a | 366 | /* Allocate sync point to use for clearing waits for expired fences */ |
8736fe81 | 367 | host->nop_sp = host1x_syncpt_alloc(host, NULL, 0); |
6579324a TB |
368 | if (!host->nop_sp) |
369 | return -ENOMEM; | |
370 | ||
75471687 TB |
371 | return 0; |
372 | } | |
373 | ||
374 | struct host1x_syncpt *host1x_syncpt_request(struct device *dev, | |
8736fe81 | 375 | unsigned long flags) |
75471687 TB |
376 | { |
377 | struct host1x *host = dev_get_drvdata(dev->parent); | |
8736fe81 | 378 | return host1x_syncpt_alloc(host, dev, flags); |
75471687 TB |
379 | } |
380 | ||
381 | void host1x_syncpt_free(struct host1x_syncpt *sp) | |
382 | { | |
383 | if (!sp) | |
384 | return; | |
385 | ||
f5a954fe | 386 | host1x_syncpt_base_free(sp->base); |
75471687 | 387 | kfree(sp->name); |
f5a954fe | 388 | sp->base = NULL; |
75471687 TB |
389 | sp->dev = NULL; |
390 | sp->name = NULL; | |
ece66891 | 391 | sp->client_managed = false; |
75471687 TB |
392 | } |
393 | ||
394 | void host1x_syncpt_deinit(struct host1x *host) | |
395 | { | |
396 | int i; | |
397 | struct host1x_syncpt *sp = host->syncpt; | |
398 | for (i = 0; i < host->info->nb_pts; i++, sp++) | |
399 | kfree(sp->name); | |
400 | } | |
401 | ||
35d747a8 TR |
402 | /* |
403 | * Read max. It indicates how many operations there are in queue, either in | |
404 | * channel or in a software thread. | |
405 | * */ | |
406 | u32 host1x_syncpt_read_max(struct host1x_syncpt *sp) | |
407 | { | |
408 | smp_rmb(); | |
409 | return (u32)atomic_read(&sp->max_val); | |
410 | } | |
411 | ||
412 | /* | |
413 | * Read min, which is a shadow of the current sync point value in hardware. | |
414 | */ | |
415 | u32 host1x_syncpt_read_min(struct host1x_syncpt *sp) | |
416 | { | |
417 | smp_rmb(); | |
418 | return (u32)atomic_read(&sp->min_val); | |
419 | } | |
420 | ||
75471687 TB |
421 | int host1x_syncpt_nb_pts(struct host1x *host) |
422 | { | |
423 | return host->info->nb_pts; | |
424 | } | |
425 | ||
426 | int host1x_syncpt_nb_bases(struct host1x *host) | |
427 | { | |
428 | return host->info->nb_bases; | |
429 | } | |
430 | ||
431 | int host1x_syncpt_nb_mlocks(struct host1x *host) | |
432 | { | |
433 | return host->info->nb_mlocks; | |
434 | } | |
435 | ||
436 | struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id) | |
437 | { | |
438 | if (host->info->nb_pts < id) | |
439 | return NULL; | |
440 | return host->syncpt + id; | |
441 | } | |
f5a954fe AM |
442 | |
443 | struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp) | |
444 | { | |
445 | return sp ? sp->base : NULL; | |
446 | } | |
447 | ||
448 | u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base) | |
449 | { | |
450 | return base->id; | |
451 | } |