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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Syncpoints
4 *
5 * Copyright (c) 2010-2015, NVIDIA Corporation.
6 */
7
8#include <linux/module.h>
9#include <linux/device.h>
10#include <linux/slab.h>
11
12#include <trace/events/host1x.h>
13
14#include "syncpt.h"
15#include "dev.h"
16#include "intr.h"
17#include "debug.h"
18
19#define SYNCPT_CHECK_PERIOD (2 * HZ)
20#define MAX_STUCK_CHECK_COUNT 15
21
22static struct host1x_syncpt_base *
23host1x_syncpt_base_request(struct host1x *host)
24{
25 struct host1x_syncpt_base *bases = host->bases;
26 unsigned int i;
27
28 for (i = 0; i < host->info->nb_bases; i++)
29 if (!bases[i].requested)
30 break;
31
32 if (i >= host->info->nb_bases)
33 return NULL;
34
35 bases[i].requested = true;
36 return &bases[i];
37}
38
39static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
40{
41 if (base)
42 base->requested = false;
43}
44
45static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
46 struct host1x_client *client,
47 unsigned long flags)
48{
49 struct host1x_syncpt *sp = host->syncpt;
50 unsigned int i;
51 char *name;
52
53 mutex_lock(&host->syncpt_mutex);
54
55 for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
56 ;
57
58 if (i >= host->info->nb_pts)
59 goto unlock;
60
61 if (flags & HOST1X_SYNCPT_HAS_BASE) {
62 sp->base = host1x_syncpt_base_request(host);
63 if (!sp->base)
64 goto unlock;
65 }
66
67 name = kasprintf(GFP_KERNEL, "%02u-%s", sp->id,
68 client ? dev_name(client->dev) : NULL);
69 if (!name)
70 goto free_base;
71
72 sp->client = client;
73 sp->name = name;
74
75 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
76 sp->client_managed = true;
77 else
78 sp->client_managed = false;
79
80 mutex_unlock(&host->syncpt_mutex);
81 return sp;
82
83free_base:
84 host1x_syncpt_base_free(sp->base);
85 sp->base = NULL;
86unlock:
87 mutex_unlock(&host->syncpt_mutex);
88 return NULL;
89}
90
91/**
92 * host1x_syncpt_id() - retrieve syncpoint ID
93 * @sp: host1x syncpoint
94 *
95 * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is
96 * often used as a value to program into registers that control how hardware
97 * blocks interact with syncpoints.
98 */
99u32 host1x_syncpt_id(struct host1x_syncpt *sp)
100{
101 return sp->id;
102}
103EXPORT_SYMBOL(host1x_syncpt_id);
104
105/**
106 * host1x_syncpt_incr_max() - update the value sent to hardware
107 * @sp: host1x syncpoint
108 * @incrs: number of increments
109 */
110u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
111{
112 return (u32)atomic_add_return(incrs, &sp->max_val);
113}
114EXPORT_SYMBOL(host1x_syncpt_incr_max);
115
116 /*
117 * Write cached syncpoint and waitbase values to hardware.
118 */
119void host1x_syncpt_restore(struct host1x *host)
120{
121 struct host1x_syncpt *sp_base = host->syncpt;
122 unsigned int i;
123
124 for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
125 host1x_hw_syncpt_restore(host, sp_base + i);
126
127 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
128 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
129
130 wmb();
131}
132
133/*
134 * Update the cached syncpoint and waitbase values by reading them
135 * from the registers.
136 */
137void host1x_syncpt_save(struct host1x *host)
138{
139 struct host1x_syncpt *sp_base = host->syncpt;
140 unsigned int i;
141
142 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
143 if (host1x_syncpt_client_managed(sp_base + i))
144 host1x_hw_syncpt_load(host, sp_base + i);
145 else
146 WARN_ON(!host1x_syncpt_idle(sp_base + i));
147 }
148
149 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
150 host1x_hw_syncpt_load_wait_base(host, sp_base + i);
151}
152
153/*
154 * Updates the cached syncpoint value by reading a new value from the hardware
155 * register
156 */
157u32 host1x_syncpt_load(struct host1x_syncpt *sp)
158{
159 u32 val;
160
161 val = host1x_hw_syncpt_load(sp->host, sp);
162 trace_host1x_syncpt_load_min(sp->id, val);
163
164 return val;
165}
166
167/*
168 * Get the current syncpoint base
169 */
170u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
171{
172 host1x_hw_syncpt_load_wait_base(sp->host, sp);
173
174 return sp->base_val;
175}
176
177/**
178 * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
179 * @sp: host1x syncpoint
180 */
181int host1x_syncpt_incr(struct host1x_syncpt *sp)
182{
183 return host1x_hw_syncpt_cpu_incr(sp->host, sp);
184}
185EXPORT_SYMBOL(host1x_syncpt_incr);
186
187/*
188 * Updated sync point form hardware, and returns true if syncpoint is expired,
189 * false if we may need to wait
190 */
191static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
192{
193 host1x_hw_syncpt_load(sp->host, sp);
194
195 return host1x_syncpt_is_expired(sp, thresh);
196}
197
198/**
199 * host1x_syncpt_wait() - wait for a syncpoint to reach a given value
200 * @sp: host1x syncpoint
201 * @thresh: threshold
202 * @timeout: maximum time to wait for the syncpoint to reach the given value
203 * @value: return location for the syncpoint value
204 */
205int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
206 u32 *value)
207{
208 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
209 void *ref;
210 struct host1x_waitlist *waiter;
211 int err = 0, check_count = 0;
212 u32 val;
213
214 if (value)
215 *value = 0;
216
217 /* first check cache */
218 if (host1x_syncpt_is_expired(sp, thresh)) {
219 if (value)
220 *value = host1x_syncpt_load(sp);
221
222 return 0;
223 }
224
225 /* try to read from register */
226 val = host1x_hw_syncpt_load(sp->host, sp);
227 if (host1x_syncpt_is_expired(sp, thresh)) {
228 if (value)
229 *value = val;
230
231 goto done;
232 }
233
234 if (!timeout) {
235 err = -EAGAIN;
236 goto done;
237 }
238
239 /* allocate a waiter */
240 waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
241 if (!waiter) {
242 err = -ENOMEM;
243 goto done;
244 }
245
246 /* schedule a wakeup when the syncpoint value is reached */
247 err = host1x_intr_add_action(sp->host, sp, thresh,
248 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
249 &wq, waiter, &ref);
250 if (err)
251 goto done;
252
253 err = -EAGAIN;
254 /* Caller-specified timeout may be impractically low */
255 if (timeout < 0)
256 timeout = LONG_MAX;
257
258 /* wait for the syncpoint, or timeout, or signal */
259 while (timeout) {
260 long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
261 int remain;
262
263 remain = wait_event_interruptible_timeout(wq,
264 syncpt_load_min_is_expired(sp, thresh),
265 check);
266 if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) {
267 if (value)
268 *value = host1x_syncpt_load(sp);
269
270 err = 0;
271
272 break;
273 }
274
275 if (remain < 0) {
276 err = remain;
277 break;
278 }
279
280 timeout -= check;
281
282 if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
283 dev_warn(sp->host->dev,
284 "%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n",
285 current->comm, sp->id, sp->name,
286 thresh, timeout);
287
288 host1x_debug_dump_syncpts(sp->host);
289
290 if (check_count == MAX_STUCK_CHECK_COUNT)
291 host1x_debug_dump(sp->host);
292
293 check_count++;
294 }
295 }
296
297 host1x_intr_put_ref(sp->host, sp->id, ref);
298
299done:
300 return err;
301}
302EXPORT_SYMBOL(host1x_syncpt_wait);
303
304/*
305 * Returns true if syncpoint is expired, false if we may need to wait
306 */
307bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
308{
309 u32 current_val;
310 u32 future_val;
311
312 smp_rmb();
313
314 current_val = (u32)atomic_read(&sp->min_val);
315 future_val = (u32)atomic_read(&sp->max_val);
316
317 /* Note the use of unsigned arithmetic here (mod 1<<32).
318 *
319 * c = current_val = min_val = the current value of the syncpoint.
320 * t = thresh = the value we are checking
321 * f = future_val = max_val = the value c will reach when all
322 * outstanding increments have completed.
323 *
324 * Note that c always chases f until it reaches f.
325 *
326 * Dtf = (f - t)
327 * Dtc = (c - t)
328 *
329 * Consider all cases:
330 *
331 * A) .....c..t..f..... Dtf < Dtc need to wait
332 * B) .....c.....f..t.. Dtf > Dtc expired
333 * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large)
334 *
335 * Any case where f==c: always expired (for any t). Dtf == Dcf
336 * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0)
337 * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0,
338 * Dtc!=0)
339 *
340 * Other cases:
341 *
342 * A) .....t..f..c..... Dtf < Dtc need to wait
343 * A) .....f..c..t..... Dtf < Dtc need to wait
344 * A) .....f..t..c..... Dtf > Dtc expired
345 *
346 * So:
347 * Dtf >= Dtc implies EXPIRED (return true)
348 * Dtf < Dtc implies WAIT (return false)
349 *
350 * Note: If t is expired then we *cannot* wait on it. We would wait
351 * forever (hang the system).
352 *
353 * Note: do NOT get clever and remove the -thresh from both sides. It
354 * is NOT the same.
355 *
356 * If future valueis zero, we have a client managed sync point. In that
357 * case we do a direct comparison.
358 */
359 if (!host1x_syncpt_client_managed(sp))
360 return future_val - thresh >= current_val - thresh;
361 else
362 return (s32)(current_val - thresh) >= 0;
363}
364
365int host1x_syncpt_init(struct host1x *host)
366{
367 struct host1x_syncpt_base *bases;
368 struct host1x_syncpt *syncpt;
369 unsigned int i;
370
371 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
372 GFP_KERNEL);
373 if (!syncpt)
374 return -ENOMEM;
375
376 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
377 GFP_KERNEL);
378 if (!bases)
379 return -ENOMEM;
380
381 for (i = 0; i < host->info->nb_pts; i++) {
382 syncpt[i].id = i;
383 syncpt[i].host = host;
384
385 /*
386 * Unassign syncpt from channels for purposes of Tegra186
387 * syncpoint protection. This prevents any channel from
388 * accessing it until it is reassigned.
389 */
390 host1x_hw_syncpt_assign_to_channel(host, &syncpt[i], NULL);
391 }
392
393 for (i = 0; i < host->info->nb_bases; i++)
394 bases[i].id = i;
395
396 mutex_init(&host->syncpt_mutex);
397 host->syncpt = syncpt;
398 host->bases = bases;
399
400 host1x_syncpt_restore(host);
401 host1x_hw_syncpt_enable_protection(host);
402
403 /* Allocate sync point to use for clearing waits for expired fences */
404 host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
405 if (!host->nop_sp)
406 return -ENOMEM;
407
408 return 0;
409}
410
411/**
412 * host1x_syncpt_request() - request a syncpoint
413 * @client: client requesting the syncpoint
414 * @flags: flags
415 *
416 * host1x client drivers can use this function to allocate a syncpoint for
417 * subsequent use. A syncpoint returned by this function will be reserved for
418 * use by the client exclusively. When no longer using a syncpoint, a host1x
419 * client driver needs to release it using host1x_syncpt_free().
420 */
421struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
422 unsigned long flags)
423{
424 struct host1x *host = dev_get_drvdata(client->parent->parent);
425
426 return host1x_syncpt_alloc(host, client, flags);
427}
428EXPORT_SYMBOL(host1x_syncpt_request);
429
430/**
431 * host1x_syncpt_free() - free a requested syncpoint
432 * @sp: host1x syncpoint
433 *
434 * Release a syncpoint previously allocated using host1x_syncpt_request(). A
435 * host1x client driver should call this when the syncpoint is no longer in
436 * use. Note that client drivers must ensure that the syncpoint doesn't remain
437 * under the control of hardware after calling this function, otherwise two
438 * clients may end up trying to access the same syncpoint concurrently.
439 */
440void host1x_syncpt_free(struct host1x_syncpt *sp)
441{
442 if (!sp)
443 return;
444
445 mutex_lock(&sp->host->syncpt_mutex);
446
447 host1x_syncpt_base_free(sp->base);
448 kfree(sp->name);
449 sp->base = NULL;
450 sp->client = NULL;
451 sp->name = NULL;
452 sp->client_managed = false;
453
454 mutex_unlock(&sp->host->syncpt_mutex);
455}
456EXPORT_SYMBOL(host1x_syncpt_free);
457
458void host1x_syncpt_deinit(struct host1x *host)
459{
460 struct host1x_syncpt *sp = host->syncpt;
461 unsigned int i;
462
463 for (i = 0; i < host->info->nb_pts; i++, sp++)
464 kfree(sp->name);
465}
466
467/**
468 * host1x_syncpt_read_max() - read maximum syncpoint value
469 * @sp: host1x syncpoint
470 *
471 * The maximum syncpoint value indicates how many operations there are in
472 * queue, either in channel or in a software thread.
473 */
474u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
475{
476 smp_rmb();
477
478 return (u32)atomic_read(&sp->max_val);
479}
480EXPORT_SYMBOL(host1x_syncpt_read_max);
481
482/**
483 * host1x_syncpt_read_min() - read minimum syncpoint value
484 * @sp: host1x syncpoint
485 *
486 * The minimum syncpoint value is a shadow of the current sync point value in
487 * hardware.
488 */
489u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
490{
491 smp_rmb();
492
493 return (u32)atomic_read(&sp->min_val);
494}
495EXPORT_SYMBOL(host1x_syncpt_read_min);
496
497/**
498 * host1x_syncpt_read() - read the current syncpoint value
499 * @sp: host1x syncpoint
500 */
501u32 host1x_syncpt_read(struct host1x_syncpt *sp)
502{
503 return host1x_syncpt_load(sp);
504}
505EXPORT_SYMBOL(host1x_syncpt_read);
506
507unsigned int host1x_syncpt_nb_pts(struct host1x *host)
508{
509 return host->info->nb_pts;
510}
511
512unsigned int host1x_syncpt_nb_bases(struct host1x *host)
513{
514 return host->info->nb_bases;
515}
516
517unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
518{
519 return host->info->nb_mlocks;
520}
521
522/**
523 * host1x_syncpt_get() - obtain a syncpoint by ID
524 * @host: host1x controller
525 * @id: syncpoint ID
526 */
527struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, unsigned int id)
528{
529 if (id >= host->info->nb_pts)
530 return NULL;
531
532 return host->syncpt + id;
533}
534EXPORT_SYMBOL(host1x_syncpt_get);
535
536/**
537 * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
538 * @sp: host1x syncpoint
539 */
540struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
541{
542 return sp ? sp->base : NULL;
543}
544EXPORT_SYMBOL(host1x_syncpt_get_base);
545
546/**
547 * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
548 * @base: host1x syncpoint wait base
549 */
550u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
551{
552 return base->id;
553}
554EXPORT_SYMBOL(host1x_syncpt_base_id);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Syncpoints
4 *
5 * Copyright (c) 2010-2015, NVIDIA Corporation.
6 */
7
8#include <linux/module.h>
9#include <linux/device.h>
10#include <linux/slab.h>
11
12#include <trace/events/host1x.h>
13
14#include "syncpt.h"
15#include "dev.h"
16#include "intr.h"
17#include "debug.h"
18
19#define SYNCPT_CHECK_PERIOD (2 * HZ)
20#define MAX_STUCK_CHECK_COUNT 15
21
22static struct host1x_syncpt_base *
23host1x_syncpt_base_request(struct host1x *host)
24{
25 struct host1x_syncpt_base *bases = host->bases;
26 unsigned int i;
27
28 for (i = 0; i < host->info->nb_bases; i++)
29 if (!bases[i].requested)
30 break;
31
32 if (i >= host->info->nb_bases)
33 return NULL;
34
35 bases[i].requested = true;
36 return &bases[i];
37}
38
39static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
40{
41 if (base)
42 base->requested = false;
43}
44
45/**
46 * host1x_syncpt_alloc() - allocate a syncpoint
47 * @host: host1x device data
48 * @flags: bitfield of HOST1X_SYNCPT_* flags
49 * @name: name for the syncpoint for use in debug prints
50 *
51 * Allocates a hardware syncpoint for the caller's use. The caller then has
52 * the sole authority to mutate the syncpoint's value until it is freed again.
53 *
54 * If no free syncpoints are available, or a NULL name was specified, returns
55 * NULL.
56 */
57struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
58 unsigned long flags,
59 const char *name)
60{
61 struct host1x_syncpt *sp = host->syncpt;
62 char *full_name;
63 unsigned int i;
64
65 if (!name)
66 return NULL;
67
68 mutex_lock(&host->syncpt_mutex);
69
70 for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)
71 ;
72
73 if (i >= host->info->nb_pts)
74 goto unlock;
75
76 if (flags & HOST1X_SYNCPT_HAS_BASE) {
77 sp->base = host1x_syncpt_base_request(host);
78 if (!sp->base)
79 goto unlock;
80 }
81
82 full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);
83 if (!full_name)
84 goto free_base;
85
86 sp->name = full_name;
87
88 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
89 sp->client_managed = true;
90 else
91 sp->client_managed = false;
92
93 kref_init(&sp->ref);
94
95 mutex_unlock(&host->syncpt_mutex);
96 return sp;
97
98free_base:
99 host1x_syncpt_base_free(sp->base);
100 sp->base = NULL;
101unlock:
102 mutex_unlock(&host->syncpt_mutex);
103 return NULL;
104}
105EXPORT_SYMBOL(host1x_syncpt_alloc);
106
107/**
108 * host1x_syncpt_id() - retrieve syncpoint ID
109 * @sp: host1x syncpoint
110 *
111 * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is
112 * often used as a value to program into registers that control how hardware
113 * blocks interact with syncpoints.
114 */
115u32 host1x_syncpt_id(struct host1x_syncpt *sp)
116{
117 return sp->id;
118}
119EXPORT_SYMBOL(host1x_syncpt_id);
120
121/**
122 * host1x_syncpt_incr_max() - update the value sent to hardware
123 * @sp: host1x syncpoint
124 * @incrs: number of increments
125 */
126u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
127{
128 return (u32)atomic_add_return(incrs, &sp->max_val);
129}
130EXPORT_SYMBOL(host1x_syncpt_incr_max);
131
132 /*
133 * Write cached syncpoint and waitbase values to hardware.
134 */
135void host1x_syncpt_restore(struct host1x *host)
136{
137 struct host1x_syncpt *sp_base = host->syncpt;
138 unsigned int i;
139
140 for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
141 host1x_hw_syncpt_restore(host, sp_base + i);
142
143 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
144 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
145
146 wmb();
147}
148
149/*
150 * Update the cached syncpoint and waitbase values by reading them
151 * from the registers.
152 */
153void host1x_syncpt_save(struct host1x *host)
154{
155 struct host1x_syncpt *sp_base = host->syncpt;
156 unsigned int i;
157
158 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
159 if (host1x_syncpt_client_managed(sp_base + i))
160 host1x_hw_syncpt_load(host, sp_base + i);
161 else
162 WARN_ON(!host1x_syncpt_idle(sp_base + i));
163 }
164
165 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
166 host1x_hw_syncpt_load_wait_base(host, sp_base + i);
167}
168
169/*
170 * Updates the cached syncpoint value by reading a new value from the hardware
171 * register
172 */
173u32 host1x_syncpt_load(struct host1x_syncpt *sp)
174{
175 u32 val;
176
177 val = host1x_hw_syncpt_load(sp->host, sp);
178 trace_host1x_syncpt_load_min(sp->id, val);
179
180 return val;
181}
182
183/*
184 * Get the current syncpoint base
185 */
186u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
187{
188 host1x_hw_syncpt_load_wait_base(sp->host, sp);
189
190 return sp->base_val;
191}
192
193/**
194 * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
195 * @sp: host1x syncpoint
196 */
197int host1x_syncpt_incr(struct host1x_syncpt *sp)
198{
199 return host1x_hw_syncpt_cpu_incr(sp->host, sp);
200}
201EXPORT_SYMBOL(host1x_syncpt_incr);
202
203/*
204 * Updated sync point form hardware, and returns true if syncpoint is expired,
205 * false if we may need to wait
206 */
207static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
208{
209 host1x_hw_syncpt_load(sp->host, sp);
210
211 return host1x_syncpt_is_expired(sp, thresh);
212}
213
214/**
215 * host1x_syncpt_wait() - wait for a syncpoint to reach a given value
216 * @sp: host1x syncpoint
217 * @thresh: threshold
218 * @timeout: maximum time to wait for the syncpoint to reach the given value
219 * @value: return location for the syncpoint value
220 */
221int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
222 u32 *value)
223{
224 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
225 void *ref;
226 struct host1x_waitlist *waiter;
227 int err = 0, check_count = 0;
228 u32 val;
229
230 if (value)
231 *value = 0;
232
233 /* first check cache */
234 if (host1x_syncpt_is_expired(sp, thresh)) {
235 if (value)
236 *value = host1x_syncpt_load(sp);
237
238 return 0;
239 }
240
241 /* try to read from register */
242 val = host1x_hw_syncpt_load(sp->host, sp);
243 if (host1x_syncpt_is_expired(sp, thresh)) {
244 if (value)
245 *value = val;
246
247 goto done;
248 }
249
250 if (!timeout) {
251 err = -EAGAIN;
252 goto done;
253 }
254
255 /* allocate a waiter */
256 waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
257 if (!waiter) {
258 err = -ENOMEM;
259 goto done;
260 }
261
262 /* schedule a wakeup when the syncpoint value is reached */
263 err = host1x_intr_add_action(sp->host, sp, thresh,
264 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
265 &wq, waiter, &ref);
266 if (err)
267 goto done;
268
269 err = -EAGAIN;
270 /* Caller-specified timeout may be impractically low */
271 if (timeout < 0)
272 timeout = LONG_MAX;
273
274 /* wait for the syncpoint, or timeout, or signal */
275 while (timeout) {
276 long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
277 int remain;
278
279 remain = wait_event_interruptible_timeout(wq,
280 syncpt_load_min_is_expired(sp, thresh),
281 check);
282 if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) {
283 if (value)
284 *value = host1x_syncpt_load(sp);
285
286 err = 0;
287
288 break;
289 }
290
291 if (remain < 0) {
292 err = remain;
293 break;
294 }
295
296 timeout -= check;
297
298 if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
299 dev_warn(sp->host->dev,
300 "%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n",
301 current->comm, sp->id, sp->name,
302 thresh, timeout);
303
304 host1x_debug_dump_syncpts(sp->host);
305
306 if (check_count == MAX_STUCK_CHECK_COUNT)
307 host1x_debug_dump(sp->host);
308
309 check_count++;
310 }
311 }
312
313 host1x_intr_put_ref(sp->host, sp->id, ref, true);
314
315done:
316 return err;
317}
318EXPORT_SYMBOL(host1x_syncpt_wait);
319
320/*
321 * Returns true if syncpoint is expired, false if we may need to wait
322 */
323bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
324{
325 u32 current_val;
326
327 smp_rmb();
328
329 current_val = (u32)atomic_read(&sp->min_val);
330
331 return ((current_val - thresh) & 0x80000000U) == 0U;
332}
333
334int host1x_syncpt_init(struct host1x *host)
335{
336 struct host1x_syncpt_base *bases;
337 struct host1x_syncpt *syncpt;
338 unsigned int i;
339
340 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
341 GFP_KERNEL);
342 if (!syncpt)
343 return -ENOMEM;
344
345 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
346 GFP_KERNEL);
347 if (!bases)
348 return -ENOMEM;
349
350 for (i = 0; i < host->info->nb_pts; i++) {
351 syncpt[i].id = i;
352 syncpt[i].host = host;
353
354 /*
355 * Unassign syncpt from channels for purposes of Tegra186
356 * syncpoint protection. This prevents any channel from
357 * accessing it until it is reassigned.
358 */
359 host1x_hw_syncpt_assign_to_channel(host, &syncpt[i], NULL);
360 }
361
362 for (i = 0; i < host->info->nb_bases; i++)
363 bases[i].id = i;
364
365 mutex_init(&host->syncpt_mutex);
366 host->syncpt = syncpt;
367 host->bases = bases;
368
369 host1x_syncpt_restore(host);
370 host1x_hw_syncpt_enable_protection(host);
371
372 /* Allocate sync point to use for clearing waits for expired fences */
373 host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");
374 if (!host->nop_sp)
375 return -ENOMEM;
376
377 if (host->info->reserve_vblank_syncpts) {
378 kref_init(&host->syncpt[26].ref);
379 kref_init(&host->syncpt[27].ref);
380 }
381
382 return 0;
383}
384
385/**
386 * host1x_syncpt_request() - request a syncpoint
387 * @client: client requesting the syncpoint
388 * @flags: flags
389 *
390 * host1x client drivers can use this function to allocate a syncpoint for
391 * subsequent use. A syncpoint returned by this function will be reserved for
392 * use by the client exclusively. When no longer using a syncpoint, a host1x
393 * client driver needs to release it using host1x_syncpt_put().
394 */
395struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
396 unsigned long flags)
397{
398 struct host1x *host = dev_get_drvdata(client->host->parent);
399
400 return host1x_syncpt_alloc(host, flags, dev_name(client->dev));
401}
402EXPORT_SYMBOL(host1x_syncpt_request);
403
404static void syncpt_release(struct kref *ref)
405{
406 struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
407
408 atomic_set(&sp->max_val, host1x_syncpt_read(sp));
409
410 mutex_lock(&sp->host->syncpt_mutex);
411
412 host1x_syncpt_base_free(sp->base);
413 kfree(sp->name);
414 sp->base = NULL;
415 sp->name = NULL;
416 sp->client_managed = false;
417
418 mutex_unlock(&sp->host->syncpt_mutex);
419}
420
421/**
422 * host1x_syncpt_put() - free a requested syncpoint
423 * @sp: host1x syncpoint
424 *
425 * Release a syncpoint previously allocated using host1x_syncpt_request(). A
426 * host1x client driver should call this when the syncpoint is no longer in
427 * use.
428 */
429void host1x_syncpt_put(struct host1x_syncpt *sp)
430{
431 if (!sp)
432 return;
433
434 kref_put(&sp->ref, syncpt_release);
435}
436EXPORT_SYMBOL(host1x_syncpt_put);
437
438void host1x_syncpt_deinit(struct host1x *host)
439{
440 struct host1x_syncpt *sp = host->syncpt;
441 unsigned int i;
442
443 for (i = 0; i < host->info->nb_pts; i++, sp++)
444 kfree(sp->name);
445}
446
447/**
448 * host1x_syncpt_read_max() - read maximum syncpoint value
449 * @sp: host1x syncpoint
450 *
451 * The maximum syncpoint value indicates how many operations there are in
452 * queue, either in channel or in a software thread.
453 */
454u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
455{
456 smp_rmb();
457
458 return (u32)atomic_read(&sp->max_val);
459}
460EXPORT_SYMBOL(host1x_syncpt_read_max);
461
462/**
463 * host1x_syncpt_read_min() - read minimum syncpoint value
464 * @sp: host1x syncpoint
465 *
466 * The minimum syncpoint value is a shadow of the current sync point value in
467 * hardware.
468 */
469u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
470{
471 smp_rmb();
472
473 return (u32)atomic_read(&sp->min_val);
474}
475EXPORT_SYMBOL(host1x_syncpt_read_min);
476
477/**
478 * host1x_syncpt_read() - read the current syncpoint value
479 * @sp: host1x syncpoint
480 */
481u32 host1x_syncpt_read(struct host1x_syncpt *sp)
482{
483 return host1x_syncpt_load(sp);
484}
485EXPORT_SYMBOL(host1x_syncpt_read);
486
487unsigned int host1x_syncpt_nb_pts(struct host1x *host)
488{
489 return host->info->nb_pts;
490}
491
492unsigned int host1x_syncpt_nb_bases(struct host1x *host)
493{
494 return host->info->nb_bases;
495}
496
497unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
498{
499 return host->info->nb_mlocks;
500}
501
502/**
503 * host1x_syncpt_get_by_id() - obtain a syncpoint by ID
504 * @host: host1x controller
505 * @id: syncpoint ID
506 */
507struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,
508 unsigned int id)
509{
510 if (id >= host->info->nb_pts)
511 return NULL;
512
513 if (kref_get_unless_zero(&host->syncpt[id].ref))
514 return &host->syncpt[id];
515 else
516 return NULL;
517}
518EXPORT_SYMBOL(host1x_syncpt_get_by_id);
519
520/**
521 * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't
522 * increase the refcount.
523 * @host: host1x controller
524 * @id: syncpoint ID
525 */
526struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,
527 unsigned int id)
528{
529 if (id >= host->info->nb_pts)
530 return NULL;
531
532 return &host->syncpt[id];
533}
534EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);
535
536/**
537 * host1x_syncpt_get() - increment syncpoint refcount
538 * @sp: syncpoint
539 */
540struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)
541{
542 kref_get(&sp->ref);
543
544 return sp;
545}
546EXPORT_SYMBOL(host1x_syncpt_get);
547
548/**
549 * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
550 * @sp: host1x syncpoint
551 */
552struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
553{
554 return sp ? sp->base : NULL;
555}
556EXPORT_SYMBOL(host1x_syncpt_get_base);
557
558/**
559 * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
560 * @base: host1x syncpoint wait base
561 */
562u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
563{
564 return base->id;
565}
566EXPORT_SYMBOL(host1x_syncpt_base_id);
567
568static void do_nothing(struct kref *ref)
569{
570}
571
572/**
573 * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint
574 * available for allocation
575 *
576 * @client: host1x bus client
577 * @syncpt_id: syncpoint ID to make available
578 *
579 * Makes VBLANK<i> syncpoint available for allocatation if it was
580 * reserved at initialization time. This should be called by the display
581 * driver after it has ensured that any VBLANK increment programming configured
582 * by the boot chain has been disabled.
583 */
584void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,
585 u32 syncpt_id)
586{
587 struct host1x *host = dev_get_drvdata(client->host->parent);
588
589 if (!host->info->reserve_vblank_syncpts)
590 return;
591
592 kref_put(&host->syncpt[syncpt_id].ref, do_nothing);
593}
594EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);