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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"
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 for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
65 ;
66
67 if (i >= host->info->nb_pts)
68 return NULL;
69
70 if (flags & HOST1X_SYNCPT_HAS_BASE) {
71 sp->base = host1x_syncpt_base_request(host);
72 if (!sp->base)
73 return NULL;
74 }
75
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;
83
84 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
85 sp->client_managed = true;
86 else
87 sp->client_managed = false;
88
89 return sp;
90}
91
92u32 host1x_syncpt_id(struct host1x_syncpt *sp)
93{
94 return sp->id;
95}
96EXPORT_SYMBOL(host1x_syncpt_id);
97
98/*
99 * Updates the value sent to hardware.
100 */
101u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
102{
103 return (u32)atomic_add_return(incrs, &sp->max_val);
104}
105EXPORT_SYMBOL(host1x_syncpt_incr_max);
106
107 /*
108 * Write cached syncpoint and waitbase values to hardware.
109 */
110void host1x_syncpt_restore(struct host1x *host)
111{
112 struct host1x_syncpt *sp_base = host->syncpt;
113 u32 i;
114
115 for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
116 host1x_hw_syncpt_restore(host, sp_base + i);
117 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
118 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
119 wmb();
120}
121
122/*
123 * Update the cached syncpoint and waitbase values by reading them
124 * from the registers.
125 */
126void host1x_syncpt_save(struct host1x *host)
127{
128 struct host1x_syncpt *sp_base = host->syncpt;
129 u32 i;
130
131 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
132 if (host1x_syncpt_client_managed(sp_base + i))
133 host1x_hw_syncpt_load(host, sp_base + i);
134 else
135 WARN_ON(!host1x_syncpt_idle(sp_base + i));
136 }
137
138 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
139 host1x_hw_syncpt_load_wait_base(host, sp_base + i);
140}
141
142/*
143 * Updates the cached syncpoint value by reading a new value from the hardware
144 * register
145 */
146u32 host1x_syncpt_load(struct host1x_syncpt *sp)
147{
148 u32 val;
149 val = host1x_hw_syncpt_load(sp->host, sp);
150 trace_host1x_syncpt_load_min(sp->id, val);
151
152 return val;
153}
154
155/*
156 * Get the current syncpoint base
157 */
158u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
159{
160 u32 val;
161 host1x_hw_syncpt_load_wait_base(sp->host, sp);
162 val = sp->base_val;
163 return val;
164}
165
166/*
167 * Increment syncpoint value from cpu, updating cache
168 */
169int host1x_syncpt_incr(struct host1x_syncpt *sp)
170{
171 return host1x_hw_syncpt_cpu_incr(sp->host, sp);
172}
173EXPORT_SYMBOL(host1x_syncpt_incr);
174
175/*
176 * Updated sync point form hardware, and returns true if syncpoint is expired,
177 * false if we may need to wait
178 */
179static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
180{
181 host1x_hw_syncpt_load(sp->host, sp);
182 return host1x_syncpt_is_expired(sp, thresh);
183}
184
185/*
186 * Main entrypoint for syncpoint value waits.
187 */
188int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
189 u32 *value)
190{
191 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
192 void *ref;
193 struct host1x_waitlist *waiter;
194 int err = 0, check_count = 0;
195 u32 val;
196
197 if (value)
198 *value = 0;
199
200 /* first check cache */
201 if (host1x_syncpt_is_expired(sp, thresh)) {
202 if (value)
203 *value = host1x_syncpt_load(sp);
204 return 0;
205 }
206
207 /* try to read from register */
208 val = host1x_hw_syncpt_load(sp->host, sp);
209 if (host1x_syncpt_is_expired(sp, thresh)) {
210 if (value)
211 *value = val;
212 goto done;
213 }
214
215 if (!timeout) {
216 err = -EAGAIN;
217 goto done;
218 }
219
220 /* allocate a waiter */
221 waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
222 if (!waiter) {
223 err = -ENOMEM;
224 goto done;
225 }
226
227 /* schedule a wakeup when the syncpoint value is reached */
228 err = host1x_intr_add_action(sp->host, sp->id, thresh,
229 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
230 &wq, waiter, &ref);
231 if (err)
232 goto done;
233
234 err = -EAGAIN;
235 /* Caller-specified timeout may be impractically low */
236 if (timeout < 0)
237 timeout = LONG_MAX;
238
239 /* wait for the syncpoint, or timeout, or signal */
240 while (timeout) {
241 long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
242 int remain = wait_event_interruptible_timeout(wq,
243 syncpt_load_min_is_expired(sp, thresh),
244 check);
245 if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) {
246 if (value)
247 *value = host1x_syncpt_load(sp);
248 err = 0;
249 break;
250 }
251 if (remain < 0) {
252 err = remain;
253 break;
254 }
255 timeout -= check;
256 if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
257 dev_warn(sp->host->dev,
258 "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n",
259 current->comm, sp->id, sp->name,
260 thresh, timeout);
261
262 host1x_debug_dump_syncpts(sp->host);
263 if (check_count == MAX_STUCK_CHECK_COUNT)
264 host1x_debug_dump(sp->host);
265 check_count++;
266 }
267 }
268 host1x_intr_put_ref(sp->host, sp->id, ref);
269
270done:
271 return err;
272}
273EXPORT_SYMBOL(host1x_syncpt_wait);
274
275/*
276 * Returns true if syncpoint is expired, false if we may need to wait
277 */
278bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
279{
280 u32 current_val;
281 u32 future_val;
282 smp_rmb();
283 current_val = (u32)atomic_read(&sp->min_val);
284 future_val = (u32)atomic_read(&sp->max_val);
285
286 /* Note the use of unsigned arithmetic here (mod 1<<32).
287 *
288 * c = current_val = min_val = the current value of the syncpoint.
289 * t = thresh = the value we are checking
290 * f = future_val = max_val = the value c will reach when all
291 * outstanding increments have completed.
292 *
293 * Note that c always chases f until it reaches f.
294 *
295 * Dtf = (f - t)
296 * Dtc = (c - t)
297 *
298 * Consider all cases:
299 *
300 * A) .....c..t..f..... Dtf < Dtc need to wait
301 * B) .....c.....f..t.. Dtf > Dtc expired
302 * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large)
303 *
304 * Any case where f==c: always expired (for any t). Dtf == Dcf
305 * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0)
306 * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0,
307 * Dtc!=0)
308 *
309 * Other cases:
310 *
311 * A) .....t..f..c..... Dtf < Dtc need to wait
312 * A) .....f..c..t..... Dtf < Dtc need to wait
313 * A) .....f..t..c..... Dtf > Dtc expired
314 *
315 * So:
316 * Dtf >= Dtc implies EXPIRED (return true)
317 * Dtf < Dtc implies WAIT (return false)
318 *
319 * Note: If t is expired then we *cannot* wait on it. We would wait
320 * forever (hang the system).
321 *
322 * Note: do NOT get clever and remove the -thresh from both sides. It
323 * is NOT the same.
324 *
325 * If future valueis zero, we have a client managed sync point. In that
326 * case we do a direct comparison.
327 */
328 if (!host1x_syncpt_client_managed(sp))
329 return future_val - thresh >= current_val - thresh;
330 else
331 return (s32)(current_val - thresh) >= 0;
332}
333
334/* remove a wait pointed to by patch_addr */
335int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
336{
337 return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr);
338}
339
340int host1x_syncpt_init(struct host1x *host)
341{
342 struct host1x_syncpt_base *bases;
343 struct host1x_syncpt *syncpt;
344 int i;
345
346 syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts,
347 GFP_KERNEL);
348 if (!syncpt)
349 return -ENOMEM;
350
351 bases = devm_kzalloc(host->dev, sizeof(*bases) * host->info->nb_bases,
352 GFP_KERNEL);
353 if (!bases)
354 return -ENOMEM;
355
356 for (i = 0; i < host->info->nb_pts; i++) {
357 syncpt[i].id = i;
358 syncpt[i].host = host;
359 }
360
361 for (i = 0; i < host->info->nb_bases; i++)
362 bases[i].id = i;
363
364 host->syncpt = syncpt;
365 host->bases = bases;
366
367 host1x_syncpt_restore(host);
368
369 /* Allocate sync point to use for clearing waits for expired fences */
370 host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
371 if (!host->nop_sp)
372 return -ENOMEM;
373
374 return 0;
375}
376
377struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
378 unsigned long flags)
379{
380 struct host1x *host = dev_get_drvdata(dev->parent);
381 return host1x_syncpt_alloc(host, dev, flags);
382}
383EXPORT_SYMBOL(host1x_syncpt_request);
384
385void host1x_syncpt_free(struct host1x_syncpt *sp)
386{
387 if (!sp)
388 return;
389
390 host1x_syncpt_base_free(sp->base);
391 kfree(sp->name);
392 sp->base = NULL;
393 sp->dev = NULL;
394 sp->name = NULL;
395 sp->client_managed = false;
396}
397EXPORT_SYMBOL(host1x_syncpt_free);
398
399void host1x_syncpt_deinit(struct host1x *host)
400{
401 int i;
402 struct host1x_syncpt *sp = host->syncpt;
403 for (i = 0; i < host->info->nb_pts; i++, sp++)
404 kfree(sp->name);
405}
406
407/*
408 * Read max. It indicates how many operations there are in queue, either in
409 * channel or in a software thread.
410 * */
411u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
412{
413 smp_rmb();
414 return (u32)atomic_read(&sp->max_val);
415}
416EXPORT_SYMBOL(host1x_syncpt_read_max);
417
418/*
419 * Read min, which is a shadow of the current sync point value in hardware.
420 */
421u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
422{
423 smp_rmb();
424 return (u32)atomic_read(&sp->min_val);
425}
426EXPORT_SYMBOL(host1x_syncpt_read_min);
427
428u32 host1x_syncpt_read(struct host1x_syncpt *sp)
429{
430 return host1x_syncpt_load(sp);
431}
432EXPORT_SYMBOL(host1x_syncpt_read);
433
434int host1x_syncpt_nb_pts(struct host1x *host)
435{
436 return host->info->nb_pts;
437}
438
439int host1x_syncpt_nb_bases(struct host1x *host)
440{
441 return host->info->nb_bases;
442}
443
444int host1x_syncpt_nb_mlocks(struct host1x *host)
445{
446 return host->info->nb_mlocks;
447}
448
449struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id)
450{
451 if (host->info->nb_pts < id)
452 return NULL;
453 return host->syncpt + id;
454}
455EXPORT_SYMBOL(host1x_syncpt_get);
456
457struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
458{
459 return sp ? sp->base : NULL;
460}
461EXPORT_SYMBOL(host1x_syncpt_get_base);
462
463u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
464{
465 return base->id;
466}
467EXPORT_SYMBOL(host1x_syncpt_base_id);
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);