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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// 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 /*
142 * Unassign syncpt from channels for purposes of Tegra186
143 * syncpoint protection. This prevents any channel from
144 * accessing it until it is reassigned.
145 */
146 host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);
147 host1x_hw_syncpt_restore(host, sp_base + i);
148 }
149
150 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
151 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
152
153 host1x_hw_syncpt_enable_protection(host);
154
155 wmb();
156}
157
158/*
159 * Update the cached syncpoint and waitbase values by reading them
160 * from the registers.
161 */
162void host1x_syncpt_save(struct host1x *host)
163{
164 struct host1x_syncpt *sp_base = host->syncpt;
165 unsigned int i;
166
167 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
168 if (host1x_syncpt_client_managed(sp_base + i))
169 host1x_hw_syncpt_load(host, sp_base + i);
170 else
171 WARN_ON(!host1x_syncpt_idle(sp_base + i));
172 }
173
174 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
175 host1x_hw_syncpt_load_wait_base(host, sp_base + i);
176}
177
178/*
179 * Updates the cached syncpoint value by reading a new value from the hardware
180 * register
181 */
182u32 host1x_syncpt_load(struct host1x_syncpt *sp)
183{
184 u32 val;
185
186 val = host1x_hw_syncpt_load(sp->host, sp);
187 trace_host1x_syncpt_load_min(sp->id, val);
188
189 return val;
190}
191
192/*
193 * Get the current syncpoint base
194 */
195u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
196{
197 host1x_hw_syncpt_load_wait_base(sp->host, sp);
198
199 return sp->base_val;
200}
201
202/**
203 * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
204 * @sp: host1x syncpoint
205 */
206int host1x_syncpt_incr(struct host1x_syncpt *sp)
207{
208 return host1x_hw_syncpt_cpu_incr(sp->host, sp);
209}
210EXPORT_SYMBOL(host1x_syncpt_incr);
211
212/*
213 * Updated sync point form hardware, and returns true if syncpoint is expired,
214 * false if we may need to wait
215 */
216static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
217{
218 host1x_hw_syncpt_load(sp->host, sp);
219
220 return host1x_syncpt_is_expired(sp, thresh);
221}
222
223/**
224 * host1x_syncpt_wait() - wait for a syncpoint to reach a given value
225 * @sp: host1x syncpoint
226 * @thresh: threshold
227 * @timeout: maximum time to wait for the syncpoint to reach the given value
228 * @value: return location for the syncpoint value
229 */
230int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
231 u32 *value)
232{
233 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
234 void *ref;
235 struct host1x_waitlist *waiter;
236 int err = 0, check_count = 0;
237
238 if (value)
239 *value = host1x_syncpt_load(sp);
240
241 if (host1x_syncpt_is_expired(sp, thresh))
242 return 0;
243
244 if (!timeout) {
245 err = -EAGAIN;
246 goto done;
247 }
248
249 /* allocate a waiter */
250 waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
251 if (!waiter) {
252 err = -ENOMEM;
253 goto done;
254 }
255
256 /* schedule a wakeup when the syncpoint value is reached */
257 err = host1x_intr_add_action(sp->host, sp, thresh,
258 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
259 &wq, waiter, &ref);
260 if (err)
261 goto done;
262
263 err = -EAGAIN;
264 /* Caller-specified timeout may be impractically low */
265 if (timeout < 0)
266 timeout = LONG_MAX;
267
268 /* wait for the syncpoint, or timeout, or signal */
269 while (timeout) {
270 long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
271 int remain;
272
273 remain = wait_event_interruptible_timeout(wq,
274 syncpt_load_min_is_expired(sp, thresh),
275 check);
276 if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) {
277 if (value)
278 *value = host1x_syncpt_load(sp);
279
280 err = 0;
281
282 break;
283 }
284
285 if (remain < 0) {
286 err = remain;
287 break;
288 }
289
290 timeout -= check;
291
292 if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
293 dev_warn(sp->host->dev,
294 "%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n",
295 current->comm, sp->id, sp->name,
296 thresh, timeout);
297
298 host1x_debug_dump_syncpts(sp->host);
299
300 if (check_count == MAX_STUCK_CHECK_COUNT)
301 host1x_debug_dump(sp->host);
302
303 check_count++;
304 }
305 }
306
307 host1x_intr_put_ref(sp->host, sp->id, ref, true);
308
309done:
310 return err;
311}
312EXPORT_SYMBOL(host1x_syncpt_wait);
313
314/*
315 * Returns true if syncpoint is expired, false if we may need to wait
316 */
317bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
318{
319 u32 current_val;
320
321 smp_rmb();
322
323 current_val = (u32)atomic_read(&sp->min_val);
324
325 return ((current_val - thresh) & 0x80000000U) == 0U;
326}
327
328int host1x_syncpt_init(struct host1x *host)
329{
330 struct host1x_syncpt_base *bases;
331 struct host1x_syncpt *syncpt;
332 unsigned int i;
333
334 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
335 GFP_KERNEL);
336 if (!syncpt)
337 return -ENOMEM;
338
339 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
340 GFP_KERNEL);
341 if (!bases)
342 return -ENOMEM;
343
344 for (i = 0; i < host->info->nb_pts; i++) {
345 syncpt[i].id = i;
346 syncpt[i].host = host;
347 }
348
349 for (i = 0; i < host->info->nb_bases; i++)
350 bases[i].id = i;
351
352 mutex_init(&host->syncpt_mutex);
353 host->syncpt = syncpt;
354 host->bases = bases;
355
356 /* Allocate sync point to use for clearing waits for expired fences */
357 host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");
358 if (!host->nop_sp)
359 return -ENOMEM;
360
361 if (host->info->reserve_vblank_syncpts) {
362 kref_init(&host->syncpt[26].ref);
363 kref_init(&host->syncpt[27].ref);
364 }
365
366 return 0;
367}
368
369/**
370 * host1x_syncpt_request() - request a syncpoint
371 * @client: client requesting the syncpoint
372 * @flags: flags
373 *
374 * host1x client drivers can use this function to allocate a syncpoint for
375 * subsequent use. A syncpoint returned by this function will be reserved for
376 * use by the client exclusively. When no longer using a syncpoint, a host1x
377 * client driver needs to release it using host1x_syncpt_put().
378 */
379struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
380 unsigned long flags)
381{
382 struct host1x *host = dev_get_drvdata(client->host->parent);
383
384 return host1x_syncpt_alloc(host, flags, dev_name(client->dev));
385}
386EXPORT_SYMBOL(host1x_syncpt_request);
387
388static void syncpt_release(struct kref *ref)
389{
390 struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
391
392 atomic_set(&sp->max_val, host1x_syncpt_read(sp));
393
394 sp->locked = false;
395
396 mutex_lock(&sp->host->syncpt_mutex);
397
398 host1x_syncpt_base_free(sp->base);
399 kfree(sp->name);
400 sp->base = NULL;
401 sp->name = NULL;
402 sp->client_managed = false;
403
404 mutex_unlock(&sp->host->syncpt_mutex);
405}
406
407/**
408 * host1x_syncpt_put() - free a requested syncpoint
409 * @sp: host1x syncpoint
410 *
411 * Release a syncpoint previously allocated using host1x_syncpt_request(). A
412 * host1x client driver should call this when the syncpoint is no longer in
413 * use.
414 */
415void host1x_syncpt_put(struct host1x_syncpt *sp)
416{
417 if (!sp)
418 return;
419
420 kref_put(&sp->ref, syncpt_release);
421}
422EXPORT_SYMBOL(host1x_syncpt_put);
423
424void host1x_syncpt_deinit(struct host1x *host)
425{
426 struct host1x_syncpt *sp = host->syncpt;
427 unsigned int i;
428
429 for (i = 0; i < host->info->nb_pts; i++, sp++)
430 kfree(sp->name);
431}
432
433/**
434 * host1x_syncpt_read_max() - read maximum syncpoint value
435 * @sp: host1x syncpoint
436 *
437 * The maximum syncpoint value indicates how many operations there are in
438 * queue, either in channel or in a software thread.
439 */
440u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
441{
442 smp_rmb();
443
444 return (u32)atomic_read(&sp->max_val);
445}
446EXPORT_SYMBOL(host1x_syncpt_read_max);
447
448/**
449 * host1x_syncpt_read_min() - read minimum syncpoint value
450 * @sp: host1x syncpoint
451 *
452 * The minimum syncpoint value is a shadow of the current sync point value in
453 * hardware.
454 */
455u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
456{
457 smp_rmb();
458
459 return (u32)atomic_read(&sp->min_val);
460}
461EXPORT_SYMBOL(host1x_syncpt_read_min);
462
463/**
464 * host1x_syncpt_read() - read the current syncpoint value
465 * @sp: host1x syncpoint
466 */
467u32 host1x_syncpt_read(struct host1x_syncpt *sp)
468{
469 return host1x_syncpt_load(sp);
470}
471EXPORT_SYMBOL(host1x_syncpt_read);
472
473unsigned int host1x_syncpt_nb_pts(struct host1x *host)
474{
475 return host->info->nb_pts;
476}
477
478unsigned int host1x_syncpt_nb_bases(struct host1x *host)
479{
480 return host->info->nb_bases;
481}
482
483unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
484{
485 return host->info->nb_mlocks;
486}
487
488/**
489 * host1x_syncpt_get_by_id() - obtain a syncpoint by ID
490 * @host: host1x controller
491 * @id: syncpoint ID
492 */
493struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,
494 unsigned int id)
495{
496 if (id >= host->info->nb_pts)
497 return NULL;
498
499 if (kref_get_unless_zero(&host->syncpt[id].ref))
500 return &host->syncpt[id];
501 else
502 return NULL;
503}
504EXPORT_SYMBOL(host1x_syncpt_get_by_id);
505
506/**
507 * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't
508 * increase the refcount.
509 * @host: host1x controller
510 * @id: syncpoint ID
511 */
512struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,
513 unsigned int id)
514{
515 if (id >= host->info->nb_pts)
516 return NULL;
517
518 return &host->syncpt[id];
519}
520EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);
521
522/**
523 * host1x_syncpt_get() - increment syncpoint refcount
524 * @sp: syncpoint
525 */
526struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)
527{
528 kref_get(&sp->ref);
529
530 return sp;
531}
532EXPORT_SYMBOL(host1x_syncpt_get);
533
534/**
535 * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
536 * @sp: host1x syncpoint
537 */
538struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
539{
540 return sp ? sp->base : NULL;
541}
542EXPORT_SYMBOL(host1x_syncpt_get_base);
543
544/**
545 * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
546 * @base: host1x syncpoint wait base
547 */
548u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
549{
550 return base->id;
551}
552EXPORT_SYMBOL(host1x_syncpt_base_id);
553
554static void do_nothing(struct kref *ref)
555{
556}
557
558/**
559 * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint
560 * available for allocation
561 *
562 * @client: host1x bus client
563 * @syncpt_id: syncpoint ID to make available
564 *
565 * Makes VBLANK<i> syncpoint available for allocatation if it was
566 * reserved at initialization time. This should be called by the display
567 * driver after it has ensured that any VBLANK increment programming configured
568 * by the boot chain has been disabled.
569 */
570void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,
571 u32 syncpt_id)
572{
573 struct host1x *host = dev_get_drvdata(client->host->parent);
574
575 if (!host->info->reserve_vblank_syncpts)
576 return;
577
578 kref_put(&host->syncpt[syncpt_id].ref, do_nothing);
579}
580EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);