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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/dma-fence.h>
11#include <linux/slab.h>
12
13#include <trace/events/host1x.h>
14
15#include "syncpt.h"
16#include "dev.h"
17#include "intr.h"
18#include "debug.h"
19
20#define SYNCPT_CHECK_PERIOD (2 * HZ)
21#define MAX_STUCK_CHECK_COUNT 15
22
23static struct host1x_syncpt_base *
24host1x_syncpt_base_request(struct host1x *host)
25{
26 struct host1x_syncpt_base *bases = host->bases;
27 unsigned int i;
28
29 for (i = 0; i < host->info->nb_bases; i++)
30 if (!bases[i].requested)
31 break;
32
33 if (i >= host->info->nb_bases)
34 return NULL;
35
36 bases[i].requested = true;
37 return &bases[i];
38}
39
40static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
41{
42 if (base)
43 base->requested = false;
44}
45
46/**
47 * host1x_syncpt_alloc() - allocate a syncpoint
48 * @host: host1x device data
49 * @flags: bitfield of HOST1X_SYNCPT_* flags
50 * @name: name for the syncpoint for use in debug prints
51 *
52 * Allocates a hardware syncpoint for the caller's use. The caller then has
53 * the sole authority to mutate the syncpoint's value until it is freed again.
54 *
55 * If no free syncpoints are available, or a NULL name was specified, returns
56 * NULL.
57 */
58struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
59 unsigned long flags,
60 const char *name)
61{
62 struct host1x_syncpt *sp = host->syncpt;
63 char *full_name;
64 unsigned int i;
65
66 if (!name)
67 return NULL;
68
69 mutex_lock(&host->syncpt_mutex);
70
71 for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)
72 ;
73
74 if (i >= host->info->nb_pts)
75 goto unlock;
76
77 if (flags & HOST1X_SYNCPT_HAS_BASE) {
78 sp->base = host1x_syncpt_base_request(host);
79 if (!sp->base)
80 goto unlock;
81 }
82
83 full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);
84 if (!full_name)
85 goto free_base;
86
87 sp->name = full_name;
88
89 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
90 sp->client_managed = true;
91 else
92 sp->client_managed = false;
93
94 kref_init(&sp->ref);
95
96 mutex_unlock(&host->syncpt_mutex);
97 return sp;
98
99free_base:
100 host1x_syncpt_base_free(sp->base);
101 sp->base = NULL;
102unlock:
103 mutex_unlock(&host->syncpt_mutex);
104 return NULL;
105}
106EXPORT_SYMBOL(host1x_syncpt_alloc);
107
108/**
109 * host1x_syncpt_id() - retrieve syncpoint ID
110 * @sp: host1x syncpoint
111 *
112 * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is
113 * often used as a value to program into registers that control how hardware
114 * blocks interact with syncpoints.
115 */
116u32 host1x_syncpt_id(struct host1x_syncpt *sp)
117{
118 return sp->id;
119}
120EXPORT_SYMBOL(host1x_syncpt_id);
121
122/**
123 * host1x_syncpt_incr_max() - update the value sent to hardware
124 * @sp: host1x syncpoint
125 * @incrs: number of increments
126 */
127u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
128{
129 return (u32)atomic_add_return(incrs, &sp->max_val);
130}
131EXPORT_SYMBOL(host1x_syncpt_incr_max);
132
133 /*
134 * Write cached syncpoint and waitbase values to hardware.
135 */
136void host1x_syncpt_restore(struct host1x *host)
137{
138 struct host1x_syncpt *sp_base = host->syncpt;
139 unsigned int i;
140
141 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
142 /*
143 * Unassign syncpt from channels for purposes of Tegra186
144 * syncpoint protection. This prevents any channel from
145 * accessing it until it is reassigned.
146 */
147 host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);
148 host1x_hw_syncpt_restore(host, sp_base + i);
149 }
150
151 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
152 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
153
154 host1x_hw_syncpt_enable_protection(host);
155
156 wmb();
157}
158
159/*
160 * Update the cached syncpoint and waitbase values by reading them
161 * from the registers.
162 */
163void host1x_syncpt_save(struct host1x *host)
164{
165 struct host1x_syncpt *sp_base = host->syncpt;
166 unsigned int i;
167
168 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
169 if (host1x_syncpt_client_managed(sp_base + i))
170 host1x_hw_syncpt_load(host, sp_base + i);
171 else
172 WARN_ON(!host1x_syncpt_idle(sp_base + i));
173 }
174
175 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
176 host1x_hw_syncpt_load_wait_base(host, sp_base + i);
177}
178
179/*
180 * Updates the cached syncpoint value by reading a new value from the hardware
181 * register
182 */
183u32 host1x_syncpt_load(struct host1x_syncpt *sp)
184{
185 u32 val;
186
187 val = host1x_hw_syncpt_load(sp->host, sp);
188 trace_host1x_syncpt_load_min(sp->id, val);
189
190 return val;
191}
192
193/*
194 * Get the current syncpoint base
195 */
196u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
197{
198 host1x_hw_syncpt_load_wait_base(sp->host, sp);
199
200 return sp->base_val;
201}
202
203/**
204 * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
205 * @sp: host1x syncpoint
206 */
207int host1x_syncpt_incr(struct host1x_syncpt *sp)
208{
209 return host1x_hw_syncpt_cpu_incr(sp->host, sp);
210}
211EXPORT_SYMBOL(host1x_syncpt_incr);
212
213/**
214 * host1x_syncpt_wait() - wait for a syncpoint to reach a given value
215 * @sp: host1x syncpoint
216 * @thresh: threshold
217 * @timeout: maximum time to wait for the syncpoint to reach the given value
218 * @value: return location for the syncpoint value
219 */
220int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
221 u32 *value)
222{
223 struct dma_fence *fence;
224 long wait_err;
225
226 host1x_hw_syncpt_load(sp->host, sp);
227
228 if (value)
229 *value = host1x_syncpt_load(sp);
230
231 if (host1x_syncpt_is_expired(sp, thresh))
232 return 0;
233
234 if (timeout < 0)
235 timeout = LONG_MAX;
236 else if (timeout == 0)
237 return -EAGAIN;
238
239 fence = host1x_fence_create(sp, thresh, false);
240 if (IS_ERR(fence))
241 return PTR_ERR(fence);
242
243 wait_err = dma_fence_wait_timeout(fence, true, timeout);
244 if (wait_err == 0)
245 host1x_fence_cancel(fence);
246 dma_fence_put(fence);
247
248 if (value)
249 *value = host1x_syncpt_load(sp);
250
251 /*
252 * Don't rely on dma_fence_wait_timeout return value,
253 * since it returns zero both on timeout and if the
254 * wait completed with 0 jiffies left.
255 */
256 host1x_hw_syncpt_load(sp->host, sp);
257 if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh))
258 return -EAGAIN;
259 else if (wait_err < 0)
260 return wait_err;
261 else
262 return 0;
263}
264EXPORT_SYMBOL(host1x_syncpt_wait);
265
266/*
267 * Returns true if syncpoint is expired, false if we may need to wait
268 */
269bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
270{
271 u32 current_val;
272
273 smp_rmb();
274
275 current_val = (u32)atomic_read(&sp->min_val);
276
277 return ((current_val - thresh) & 0x80000000U) == 0U;
278}
279
280int host1x_syncpt_init(struct host1x *host)
281{
282 struct host1x_syncpt_base *bases;
283 struct host1x_syncpt *syncpt;
284 unsigned int i;
285
286 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
287 GFP_KERNEL);
288 if (!syncpt)
289 return -ENOMEM;
290
291 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
292 GFP_KERNEL);
293 if (!bases)
294 return -ENOMEM;
295
296 for (i = 0; i < host->info->nb_pts; i++) {
297 syncpt[i].id = i;
298 syncpt[i].host = host;
299 }
300
301 for (i = 0; i < host->info->nb_bases; i++)
302 bases[i].id = i;
303
304 mutex_init(&host->syncpt_mutex);
305 host->syncpt = syncpt;
306 host->bases = bases;
307
308 /* Allocate sync point to use for clearing waits for expired fences */
309 host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");
310 if (!host->nop_sp)
311 return -ENOMEM;
312
313 if (host->info->reserve_vblank_syncpts) {
314 kref_init(&host->syncpt[26].ref);
315 kref_init(&host->syncpt[27].ref);
316 }
317
318 return 0;
319}
320
321/**
322 * host1x_syncpt_request() - request a syncpoint
323 * @client: client requesting the syncpoint
324 * @flags: flags
325 *
326 * host1x client drivers can use this function to allocate a syncpoint for
327 * subsequent use. A syncpoint returned by this function will be reserved for
328 * use by the client exclusively. When no longer using a syncpoint, a host1x
329 * client driver needs to release it using host1x_syncpt_put().
330 */
331struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
332 unsigned long flags)
333{
334 struct host1x *host = dev_get_drvdata(client->host->parent);
335
336 return host1x_syncpt_alloc(host, flags, dev_name(client->dev));
337}
338EXPORT_SYMBOL(host1x_syncpt_request);
339
340static void syncpt_release(struct kref *ref)
341{
342 struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
343
344 atomic_set(&sp->max_val, host1x_syncpt_read(sp));
345
346 sp->locked = false;
347
348 mutex_lock(&sp->host->syncpt_mutex);
349
350 host1x_syncpt_base_free(sp->base);
351 kfree(sp->name);
352 sp->base = NULL;
353 sp->name = NULL;
354 sp->client_managed = false;
355
356 mutex_unlock(&sp->host->syncpt_mutex);
357}
358
359/**
360 * host1x_syncpt_put() - free a requested syncpoint
361 * @sp: host1x syncpoint
362 *
363 * Release a syncpoint previously allocated using host1x_syncpt_request(). A
364 * host1x client driver should call this when the syncpoint is no longer in
365 * use.
366 */
367void host1x_syncpt_put(struct host1x_syncpt *sp)
368{
369 if (!sp)
370 return;
371
372 kref_put(&sp->ref, syncpt_release);
373}
374EXPORT_SYMBOL(host1x_syncpt_put);
375
376void host1x_syncpt_deinit(struct host1x *host)
377{
378 struct host1x_syncpt *sp = host->syncpt;
379 unsigned int i;
380
381 for (i = 0; i < host->info->nb_pts; i++, sp++)
382 kfree(sp->name);
383}
384
385/**
386 * host1x_syncpt_read_max() - read maximum syncpoint value
387 * @sp: host1x syncpoint
388 *
389 * The maximum syncpoint value indicates how many operations there are in
390 * queue, either in channel or in a software thread.
391 */
392u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
393{
394 smp_rmb();
395
396 return (u32)atomic_read(&sp->max_val);
397}
398EXPORT_SYMBOL(host1x_syncpt_read_max);
399
400/**
401 * host1x_syncpt_read_min() - read minimum syncpoint value
402 * @sp: host1x syncpoint
403 *
404 * The minimum syncpoint value is a shadow of the current sync point value in
405 * hardware.
406 */
407u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
408{
409 smp_rmb();
410
411 return (u32)atomic_read(&sp->min_val);
412}
413EXPORT_SYMBOL(host1x_syncpt_read_min);
414
415/**
416 * host1x_syncpt_read() - read the current syncpoint value
417 * @sp: host1x syncpoint
418 */
419u32 host1x_syncpt_read(struct host1x_syncpt *sp)
420{
421 return host1x_syncpt_load(sp);
422}
423EXPORT_SYMBOL(host1x_syncpt_read);
424
425unsigned int host1x_syncpt_nb_pts(struct host1x *host)
426{
427 return host->info->nb_pts;
428}
429
430unsigned int host1x_syncpt_nb_bases(struct host1x *host)
431{
432 return host->info->nb_bases;
433}
434
435unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
436{
437 return host->info->nb_mlocks;
438}
439
440/**
441 * host1x_syncpt_get_by_id() - obtain a syncpoint by ID
442 * @host: host1x controller
443 * @id: syncpoint ID
444 */
445struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,
446 unsigned int id)
447{
448 if (id >= host->info->nb_pts)
449 return NULL;
450
451 if (kref_get_unless_zero(&host->syncpt[id].ref))
452 return &host->syncpt[id];
453 else
454 return NULL;
455}
456EXPORT_SYMBOL(host1x_syncpt_get_by_id);
457
458/**
459 * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't
460 * increase the refcount.
461 * @host: host1x controller
462 * @id: syncpoint ID
463 */
464struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,
465 unsigned int id)
466{
467 if (id >= host->info->nb_pts)
468 return NULL;
469
470 return &host->syncpt[id];
471}
472EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);
473
474/**
475 * host1x_syncpt_get() - increment syncpoint refcount
476 * @sp: syncpoint
477 */
478struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)
479{
480 kref_get(&sp->ref);
481
482 return sp;
483}
484EXPORT_SYMBOL(host1x_syncpt_get);
485
486/**
487 * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
488 * @sp: host1x syncpoint
489 */
490struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
491{
492 return sp ? sp->base : NULL;
493}
494EXPORT_SYMBOL(host1x_syncpt_get_base);
495
496/**
497 * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
498 * @base: host1x syncpoint wait base
499 */
500u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
501{
502 return base->id;
503}
504EXPORT_SYMBOL(host1x_syncpt_base_id);
505
506static void do_nothing(struct kref *ref)
507{
508}
509
510/**
511 * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint
512 * available for allocation
513 *
514 * @client: host1x bus client
515 * @syncpt_id: syncpoint ID to make available
516 *
517 * Makes VBLANK<i> syncpoint available for allocatation if it was
518 * reserved at initialization time. This should be called by the display
519 * driver after it has ensured that any VBLANK increment programming configured
520 * by the boot chain has been disabled.
521 */
522void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,
523 u32 syncpt_id)
524{
525 struct host1x *host = dev_get_drvdata(client->host->parent);
526
527 if (!host->info->reserve_vblank_syncpts)
528 return;
529
530 kref_put(&host->syncpt[syncpt_id].ref, do_nothing);
531}
532EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);
1/*
2 * Tegra host1x Syncpoints
3 *
4 * Copyright (c) 2010-2015, 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"
27#include "intr.h"
28#include "debug.h"
29
30#define SYNCPT_CHECK_PERIOD (2 * HZ)
31#define MAX_STUCK_CHECK_COUNT 15
32
33static struct host1x_syncpt_base *
34host1x_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
50static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
51{
52 if (base)
53 base->requested = false;
54}
55
56static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
57 struct device *dev,
58 unsigned long flags)
59{
60 int i;
61 struct host1x_syncpt *sp = host->syncpt;
62 char *name;
63
64 mutex_lock(&host->syncpt_mutex);
65
66 for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
67 ;
68
69 if (i >= host->info->nb_pts)
70 goto unlock;
71
72 if (flags & HOST1X_SYNCPT_HAS_BASE) {
73 sp->base = host1x_syncpt_base_request(host);
74 if (!sp->base)
75 goto unlock;
76 }
77
78 name = kasprintf(GFP_KERNEL, "%02u-%s", sp->id,
79 dev ? dev_name(dev) : NULL);
80 if (!name)
81 goto free_base;
82
83 sp->dev = dev;
84 sp->name = name;
85
86 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
87 sp->client_managed = true;
88 else
89 sp->client_managed = false;
90
91 mutex_unlock(&host->syncpt_mutex);
92 return sp;
93
94free_base:
95 host1x_syncpt_base_free(sp->base);
96 sp->base = NULL;
97unlock:
98 mutex_unlock(&host->syncpt_mutex);
99 return NULL;
100}
101
102u32 host1x_syncpt_id(struct host1x_syncpt *sp)
103{
104 return sp->id;
105}
106EXPORT_SYMBOL(host1x_syncpt_id);
107
108/*
109 * Updates the value sent to hardware.
110 */
111u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
112{
113 return (u32)atomic_add_return(incrs, &sp->max_val);
114}
115EXPORT_SYMBOL(host1x_syncpt_incr_max);
116
117 /*
118 * Write cached syncpoint and waitbase values to hardware.
119 */
120void host1x_syncpt_restore(struct host1x *host)
121{
122 struct host1x_syncpt *sp_base = host->syncpt;
123 unsigned int i;
124
125 for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
126 host1x_hw_syncpt_restore(host, sp_base + i);
127
128 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
129 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
130
131 wmb();
132}
133
134/*
135 * Update the cached syncpoint and waitbase values by reading them
136 * from the registers.
137 */
138void host1x_syncpt_save(struct host1x *host)
139{
140 struct host1x_syncpt *sp_base = host->syncpt;
141 unsigned int i;
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 */
158u32 host1x_syncpt_load(struct host1x_syncpt *sp)
159{
160 u32 val;
161
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 */
171u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
172{
173 host1x_hw_syncpt_load_wait_base(sp->host, sp);
174
175 return sp->base_val;
176}
177
178/*
179 * Increment syncpoint value from cpu, updating cache
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 * Main entrypoint for syncpoint value waits.
200 */
201int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
202 u32 *value)
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);
217
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;
226
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);
257 int remain;
258
259 remain = wait_event_interruptible_timeout(wq,
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);
265
266 err = 0;
267
268 break;
269 }
270
271 if (remain < 0) {
272 err = remain;
273 break;
274 }
275
276 timeout -= check;
277
278 if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
279 dev_warn(sp->host->dev,
280 "%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n",
281 current->comm, sp->id, sp->name,
282 thresh, timeout);
283
284 host1x_debug_dump_syncpts(sp->host);
285
286 if (check_count == MAX_STUCK_CHECK_COUNT)
287 host1x_debug_dump(sp->host);
288
289 check_count++;
290 }
291 }
292
293 host1x_intr_put_ref(sp->host, sp->id, ref);
294
295done:
296 return err;
297}
298EXPORT_SYMBOL(host1x_syncpt_wait);
299
300/*
301 * Returns true if syncpoint is expired, false if we may need to wait
302 */
303bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
304{
305 u32 current_val;
306 u32 future_val;
307
308 smp_rmb();
309
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
361/* remove a wait pointed to by patch_addr */
362int 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
367int host1x_syncpt_init(struct host1x *host)
368{
369 struct host1x_syncpt_base *bases;
370 struct host1x_syncpt *syncpt;
371 unsigned int i;
372
373 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
374 GFP_KERNEL);
375 if (!syncpt)
376 return -ENOMEM;
377
378 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
379 GFP_KERNEL);
380 if (!bases)
381 return -ENOMEM;
382
383 for (i = 0; i < host->info->nb_pts; i++) {
384 syncpt[i].id = i;
385 syncpt[i].host = host;
386 }
387
388 for (i = 0; i < host->info->nb_bases; i++)
389 bases[i].id = i;
390
391 mutex_init(&host->syncpt_mutex);
392 host->syncpt = syncpt;
393 host->bases = bases;
394
395 host1x_syncpt_restore(host);
396
397 /* Allocate sync point to use for clearing waits for expired fences */
398 host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
399 if (!host->nop_sp)
400 return -ENOMEM;
401
402 return 0;
403}
404
405struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
406 unsigned long flags)
407{
408 struct host1x *host = dev_get_drvdata(dev->parent);
409
410 return host1x_syncpt_alloc(host, dev, flags);
411}
412EXPORT_SYMBOL(host1x_syncpt_request);
413
414void host1x_syncpt_free(struct host1x_syncpt *sp)
415{
416 if (!sp)
417 return;
418
419 mutex_lock(&sp->host->syncpt_mutex);
420
421 host1x_syncpt_base_free(sp->base);
422 kfree(sp->name);
423 sp->base = NULL;
424 sp->dev = NULL;
425 sp->name = NULL;
426 sp->client_managed = false;
427
428 mutex_unlock(&sp->host->syncpt_mutex);
429}
430EXPORT_SYMBOL(host1x_syncpt_free);
431
432void host1x_syncpt_deinit(struct host1x *host)
433{
434 struct host1x_syncpt *sp = host->syncpt;
435 unsigned int i;
436
437 for (i = 0; i < host->info->nb_pts; i++, sp++)
438 kfree(sp->name);
439}
440
441/*
442 * Read max. It indicates how many operations there are in queue, either in
443 * channel or in a software thread.
444 */
445u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
446{
447 smp_rmb();
448
449 return (u32)atomic_read(&sp->max_val);
450}
451EXPORT_SYMBOL(host1x_syncpt_read_max);
452
453/*
454 * Read min, which is a shadow of the current sync point value in hardware.
455 */
456u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
457{
458 smp_rmb();
459
460 return (u32)atomic_read(&sp->min_val);
461}
462EXPORT_SYMBOL(host1x_syncpt_read_min);
463
464u32 host1x_syncpt_read(struct host1x_syncpt *sp)
465{
466 return host1x_syncpt_load(sp);
467}
468EXPORT_SYMBOL(host1x_syncpt_read);
469
470unsigned int host1x_syncpt_nb_pts(struct host1x *host)
471{
472 return host->info->nb_pts;
473}
474
475unsigned int host1x_syncpt_nb_bases(struct host1x *host)
476{
477 return host->info->nb_bases;
478}
479
480unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
481{
482 return host->info->nb_mlocks;
483}
484
485struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, unsigned int id)
486{
487 if (host->info->nb_pts < id)
488 return NULL;
489
490 return host->syncpt + id;
491}
492EXPORT_SYMBOL(host1x_syncpt_get);
493
494struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
495{
496 return sp ? sp->base : NULL;
497}
498EXPORT_SYMBOL(host1x_syncpt_get_base);
499
500u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
501{
502 return base->id;
503}
504EXPORT_SYMBOL(host1x_syncpt_base_id);