2 * Tegra host1x Syncpoints
4 * Copyright (c) 2010-2015, NVIDIA Corporation.
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.
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
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/>.
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/slab.h>
23 #include <trace/events/host1x.h>
30 #define SYNCPT_CHECK_PERIOD (2 * HZ)
31 #define MAX_STUCK_CHECK_COUNT 15
33 static struct host1x_syncpt_base
*
34 host1x_syncpt_base_request(struct host1x
*host
)
36 struct host1x_syncpt_base
*bases
= host
->bases
;
39 for (i
= 0; i
< host
->info
->nb_bases
; i
++)
40 if (!bases
[i
].requested
)
43 if (i
>= host
->info
->nb_bases
)
46 bases
[i
].requested
= true;
50 static void host1x_syncpt_base_free(struct host1x_syncpt_base
*base
)
53 base
->requested
= false;
56 static struct host1x_syncpt
*host1x_syncpt_alloc(struct host1x
*host
,
61 struct host1x_syncpt
*sp
= host
->syncpt
;
64 mutex_lock(&host
->syncpt_mutex
);
66 for (i
= 0; i
< host
->info
->nb_pts
&& sp
->name
; i
++, sp
++)
69 if (i
>= host
->info
->nb_pts
)
72 if (flags
& HOST1X_SYNCPT_HAS_BASE
) {
73 sp
->base
= host1x_syncpt_base_request(host
);
78 name
= kasprintf(GFP_KERNEL
, "%02u-%s", sp
->id
,
79 dev
? dev_name(dev
) : NULL
);
86 if (flags
& HOST1X_SYNCPT_CLIENT_MANAGED
)
87 sp
->client_managed
= true;
89 sp
->client_managed
= false;
91 mutex_unlock(&host
->syncpt_mutex
);
95 host1x_syncpt_base_free(sp
->base
);
98 mutex_unlock(&host
->syncpt_mutex
);
102 u32
host1x_syncpt_id(struct host1x_syncpt
*sp
)
106 EXPORT_SYMBOL(host1x_syncpt_id
);
109 * Updates the value sent to hardware.
111 u32
host1x_syncpt_incr_max(struct host1x_syncpt
*sp
, u32 incrs
)
113 return (u32
)atomic_add_return(incrs
, &sp
->max_val
);
115 EXPORT_SYMBOL(host1x_syncpt_incr_max
);
118 * Write cached syncpoint and waitbase values to hardware.
120 void host1x_syncpt_restore(struct host1x
*host
)
122 struct host1x_syncpt
*sp_base
= host
->syncpt
;
125 for (i
= 0; i
< host1x_syncpt_nb_pts(host
); i
++)
126 host1x_hw_syncpt_restore(host
, sp_base
+ i
);
128 for (i
= 0; i
< host1x_syncpt_nb_bases(host
); i
++)
129 host1x_hw_syncpt_restore_wait_base(host
, sp_base
+ i
);
135 * Update the cached syncpoint and waitbase values by reading them
136 * from the registers.
138 void host1x_syncpt_save(struct host1x
*host
)
140 struct host1x_syncpt
*sp_base
= host
->syncpt
;
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
);
147 WARN_ON(!host1x_syncpt_idle(sp_base
+ i
));
150 for (i
= 0; i
< host1x_syncpt_nb_bases(host
); i
++)
151 host1x_hw_syncpt_load_wait_base(host
, sp_base
+ i
);
155 * Updates the cached syncpoint value by reading a new value from the hardware
158 u32
host1x_syncpt_load(struct host1x_syncpt
*sp
)
162 val
= host1x_hw_syncpt_load(sp
->host
, sp
);
163 trace_host1x_syncpt_load_min(sp
->id
, val
);
169 * Get the current syncpoint base
171 u32
host1x_syncpt_load_wait_base(struct host1x_syncpt
*sp
)
173 host1x_hw_syncpt_load_wait_base(sp
->host
, sp
);
179 * Increment syncpoint value from cpu, updating cache
181 int host1x_syncpt_incr(struct host1x_syncpt
*sp
)
183 return host1x_hw_syncpt_cpu_incr(sp
->host
, sp
);
185 EXPORT_SYMBOL(host1x_syncpt_incr
);
188 * Updated sync point form hardware, and returns true if syncpoint is expired,
189 * false if we may need to wait
191 static bool syncpt_load_min_is_expired(struct host1x_syncpt
*sp
, u32 thresh
)
193 host1x_hw_syncpt_load(sp
->host
, sp
);
195 return host1x_syncpt_is_expired(sp
, thresh
);
199 * Main entrypoint for syncpoint value waits.
201 int host1x_syncpt_wait(struct host1x_syncpt
*sp
, u32 thresh
, long timeout
,
204 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
206 struct host1x_waitlist
*waiter
;
207 int err
= 0, check_count
= 0;
213 /* first check cache */
214 if (host1x_syncpt_is_expired(sp
, thresh
)) {
216 *value
= host1x_syncpt_load(sp
);
221 /* try to read from register */
222 val
= host1x_hw_syncpt_load(sp
->host
, sp
);
223 if (host1x_syncpt_is_expired(sp
, thresh
)) {
235 /* allocate a waiter */
236 waiter
= kzalloc(sizeof(*waiter
), GFP_KERNEL
);
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
,
250 /* Caller-specified timeout may be impractically low */
254 /* wait for the syncpoint, or timeout, or signal */
256 long check
= min_t(long, SYNCPT_CHECK_PERIOD
, timeout
);
259 remain
= wait_event_interruptible_timeout(wq
,
260 syncpt_load_min_is_expired(sp
, thresh
),
262 if (remain
> 0 || host1x_syncpt_is_expired(sp
, thresh
)) {
264 *value
= host1x_syncpt_load(sp
);
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
,
284 host1x_debug_dump_syncpts(sp
->host
);
286 if (check_count
== MAX_STUCK_CHECK_COUNT
)
287 host1x_debug_dump(sp
->host
);
293 host1x_intr_put_ref(sp
->host
, sp
->id
, ref
);
298 EXPORT_SYMBOL(host1x_syncpt_wait
);
301 * Returns true if syncpoint is expired, false if we may need to wait
303 bool host1x_syncpt_is_expired(struct host1x_syncpt
*sp
, u32 thresh
)
310 current_val
= (u32
)atomic_read(&sp
->min_val
);
311 future_val
= (u32
)atomic_read(&sp
->max_val
);
313 /* Note the use of unsigned arithmetic here (mod 1<<32).
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.
320 * Note that c always chases f until it reaches f.
325 * Consider all cases:
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)
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,
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
343 * Dtf >= Dtc implies EXPIRED (return true)
344 * Dtf < Dtc implies WAIT (return false)
346 * Note: If t is expired then we *cannot* wait on it. We would wait
347 * forever (hang the system).
349 * Note: do NOT get clever and remove the -thresh from both sides. It
352 * If future valueis zero, we have a client managed sync point. In that
353 * case we do a direct comparison.
355 if (!host1x_syncpt_client_managed(sp
))
356 return future_val
- thresh
>= current_val
- thresh
;
358 return (s32
)(current_val
- thresh
) >= 0;
361 /* remove a wait pointed to by patch_addr */
362 int host1x_syncpt_patch_wait(struct host1x_syncpt
*sp
, void *patch_addr
)
364 return host1x_hw_syncpt_patch_wait(sp
->host
, sp
, patch_addr
);
367 int host1x_syncpt_init(struct host1x
*host
)
369 struct host1x_syncpt_base
*bases
;
370 struct host1x_syncpt
*syncpt
;
373 syncpt
= devm_kcalloc(host
->dev
, host
->info
->nb_pts
, sizeof(*syncpt
),
378 bases
= devm_kcalloc(host
->dev
, host
->info
->nb_bases
, sizeof(*bases
),
383 for (i
= 0; i
< host
->info
->nb_pts
; i
++) {
385 syncpt
[i
].host
= host
;
388 for (i
= 0; i
< host
->info
->nb_bases
; i
++)
391 mutex_init(&host
->syncpt_mutex
);
392 host
->syncpt
= syncpt
;
395 host1x_syncpt_restore(host
);
397 /* Allocate sync point to use for clearing waits for expired fences */
398 host
->nop_sp
= host1x_syncpt_alloc(host
, NULL
, 0);
405 struct host1x_syncpt
*host1x_syncpt_request(struct device
*dev
,
408 struct host1x
*host
= dev_get_drvdata(dev
->parent
);
410 return host1x_syncpt_alloc(host
, dev
, flags
);
412 EXPORT_SYMBOL(host1x_syncpt_request
);
414 void host1x_syncpt_free(struct host1x_syncpt
*sp
)
419 mutex_lock(&sp
->host
->syncpt_mutex
);
421 host1x_syncpt_base_free(sp
->base
);
426 sp
->client_managed
= false;
428 mutex_unlock(&sp
->host
->syncpt_mutex
);
430 EXPORT_SYMBOL(host1x_syncpt_free
);
432 void host1x_syncpt_deinit(struct host1x
*host
)
434 struct host1x_syncpt
*sp
= host
->syncpt
;
437 for (i
= 0; i
< host
->info
->nb_pts
; i
++, sp
++)
442 * Read max. It indicates how many operations there are in queue, either in
443 * channel or in a software thread.
445 u32
host1x_syncpt_read_max(struct host1x_syncpt
*sp
)
449 return (u32
)atomic_read(&sp
->max_val
);
451 EXPORT_SYMBOL(host1x_syncpt_read_max
);
454 * Read min, which is a shadow of the current sync point value in hardware.
456 u32
host1x_syncpt_read_min(struct host1x_syncpt
*sp
)
460 return (u32
)atomic_read(&sp
->min_val
);
462 EXPORT_SYMBOL(host1x_syncpt_read_min
);
464 u32
host1x_syncpt_read(struct host1x_syncpt
*sp
)
466 return host1x_syncpt_load(sp
);
468 EXPORT_SYMBOL(host1x_syncpt_read
);
470 unsigned int host1x_syncpt_nb_pts(struct host1x
*host
)
472 return host
->info
->nb_pts
;
475 unsigned int host1x_syncpt_nb_bases(struct host1x
*host
)
477 return host
->info
->nb_bases
;
480 unsigned int host1x_syncpt_nb_mlocks(struct host1x
*host
)
482 return host
->info
->nb_mlocks
;
485 struct host1x_syncpt
*host1x_syncpt_get(struct host1x
*host
, unsigned int id
)
487 if (host
->info
->nb_pts
< id
)
490 return host
->syncpt
+ id
;
492 EXPORT_SYMBOL(host1x_syncpt_get
);
494 struct host1x_syncpt_base
*host1x_syncpt_get_base(struct host1x_syncpt
*sp
)
496 return sp
? sp
->base
: NULL
;
498 EXPORT_SYMBOL(host1x_syncpt_get_base
);
500 u32
host1x_syncpt_base_id(struct host1x_syncpt_base
*base
)
504 EXPORT_SYMBOL(host1x_syncpt_base_id
);