2 * Tegra host1x Syncpoints
4 * Copyright (c) 2010-2013, 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 for (i
= 0; i
< host
->info
->nb_pts
&& sp
->name
; i
++, sp
++)
67 if (i
>= host
->info
->nb_pts
)
70 if (flags
& HOST1X_SYNCPT_HAS_BASE
) {
71 sp
->base
= host1x_syncpt_base_request(host
);
76 name
= kasprintf(GFP_KERNEL
, "%02d-%s", sp
->id
,
77 dev
? dev_name(dev
) : NULL
);
84 if (flags
& HOST1X_SYNCPT_CLIENT_MANAGED
)
85 sp
->client_managed
= true;
87 sp
->client_managed
= false;
92 u32
host1x_syncpt_id(struct host1x_syncpt
*sp
)
98 * Updates the value sent to hardware.
100 u32
host1x_syncpt_incr_max(struct host1x_syncpt
*sp
, u32 incrs
)
102 return (u32
)atomic_add_return(incrs
, &sp
->max_val
);
106 * Write cached syncpoint and waitbase values to hardware.
108 void host1x_syncpt_restore(struct host1x
*host
)
110 struct host1x_syncpt
*sp_base
= host
->syncpt
;
113 for (i
= 0; i
< host1x_syncpt_nb_pts(host
); i
++)
114 host1x_hw_syncpt_restore(host
, sp_base
+ i
);
115 for (i
= 0; i
< host1x_syncpt_nb_bases(host
); i
++)
116 host1x_hw_syncpt_restore_wait_base(host
, sp_base
+ i
);
121 * Update the cached syncpoint and waitbase values by reading them
122 * from the registers.
124 void host1x_syncpt_save(struct host1x
*host
)
126 struct host1x_syncpt
*sp_base
= host
->syncpt
;
129 for (i
= 0; i
< host1x_syncpt_nb_pts(host
); i
++) {
130 if (host1x_syncpt_client_managed(sp_base
+ i
))
131 host1x_hw_syncpt_load(host
, sp_base
+ i
);
133 WARN_ON(!host1x_syncpt_idle(sp_base
+ i
));
136 for (i
= 0; i
< host1x_syncpt_nb_bases(host
); i
++)
137 host1x_hw_syncpt_load_wait_base(host
, sp_base
+ i
);
141 * Updates the cached syncpoint value by reading a new value from the hardware
144 u32
host1x_syncpt_load(struct host1x_syncpt
*sp
)
147 val
= host1x_hw_syncpt_load(sp
->host
, sp
);
148 trace_host1x_syncpt_load_min(sp
->id
, val
);
154 * Get the current syncpoint base
156 u32
host1x_syncpt_load_wait_base(struct host1x_syncpt
*sp
)
159 host1x_hw_syncpt_load_wait_base(sp
->host
, sp
);
165 * Increment syncpoint value from cpu, updating cache
167 int host1x_syncpt_incr(struct host1x_syncpt
*sp
)
169 return host1x_hw_syncpt_cpu_incr(sp
->host
, sp
);
173 * Updated sync point form hardware, and returns true if syncpoint is expired,
174 * false if we may need to wait
176 static bool syncpt_load_min_is_expired(struct host1x_syncpt
*sp
, u32 thresh
)
178 host1x_hw_syncpt_load(sp
->host
, sp
);
179 return host1x_syncpt_is_expired(sp
, thresh
);
183 * Main entrypoint for syncpoint value waits.
185 int host1x_syncpt_wait(struct host1x_syncpt
*sp
, u32 thresh
, long timeout
,
188 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
190 struct host1x_waitlist
*waiter
;
191 int err
= 0, check_count
= 0;
197 /* first check cache */
198 if (host1x_syncpt_is_expired(sp
, thresh
)) {
200 *value
= host1x_syncpt_load(sp
);
204 /* try to read from register */
205 val
= host1x_hw_syncpt_load(sp
->host
, sp
);
206 if (host1x_syncpt_is_expired(sp
, thresh
)) {
217 /* allocate a waiter */
218 waiter
= kzalloc(sizeof(*waiter
), GFP_KERNEL
);
224 /* schedule a wakeup when the syncpoint value is reached */
225 err
= host1x_intr_add_action(sp
->host
, sp
->id
, thresh
,
226 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE
,
232 /* Caller-specified timeout may be impractically low */
236 /* wait for the syncpoint, or timeout, or signal */
238 long check
= min_t(long, SYNCPT_CHECK_PERIOD
, timeout
);
239 int remain
= wait_event_interruptible_timeout(wq
,
240 syncpt_load_min_is_expired(sp
, thresh
),
242 if (remain
> 0 || host1x_syncpt_is_expired(sp
, thresh
)) {
244 *value
= host1x_syncpt_load(sp
);
253 if (timeout
&& check_count
<= MAX_STUCK_CHECK_COUNT
) {
254 dev_warn(sp
->host
->dev
,
255 "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n",
256 current
->comm
, sp
->id
, sp
->name
,
259 host1x_debug_dump_syncpts(sp
->host
);
260 if (check_count
== MAX_STUCK_CHECK_COUNT
)
261 host1x_debug_dump(sp
->host
);
265 host1x_intr_put_ref(sp
->host
, sp
->id
, ref
);
270 EXPORT_SYMBOL(host1x_syncpt_wait
);
273 * Returns true if syncpoint is expired, false if we may need to wait
275 bool host1x_syncpt_is_expired(struct host1x_syncpt
*sp
, u32 thresh
)
280 current_val
= (u32
)atomic_read(&sp
->min_val
);
281 future_val
= (u32
)atomic_read(&sp
->max_val
);
283 /* Note the use of unsigned arithmetic here (mod 1<<32).
285 * c = current_val = min_val = the current value of the syncpoint.
286 * t = thresh = the value we are checking
287 * f = future_val = max_val = the value c will reach when all
288 * outstanding increments have completed.
290 * Note that c always chases f until it reaches f.
295 * Consider all cases:
297 * A) .....c..t..f..... Dtf < Dtc need to wait
298 * B) .....c.....f..t.. Dtf > Dtc expired
299 * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large)
301 * Any case where f==c: always expired (for any t). Dtf == Dcf
302 * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0)
303 * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0,
308 * A) .....t..f..c..... Dtf < Dtc need to wait
309 * A) .....f..c..t..... Dtf < Dtc need to wait
310 * A) .....f..t..c..... Dtf > Dtc expired
313 * Dtf >= Dtc implies EXPIRED (return true)
314 * Dtf < Dtc implies WAIT (return false)
316 * Note: If t is expired then we *cannot* wait on it. We would wait
317 * forever (hang the system).
319 * Note: do NOT get clever and remove the -thresh from both sides. It
322 * If future valueis zero, we have a client managed sync point. In that
323 * case we do a direct comparison.
325 if (!host1x_syncpt_client_managed(sp
))
326 return future_val
- thresh
>= current_val
- thresh
;
328 return (s32
)(current_val
- thresh
) >= 0;
331 /* remove a wait pointed to by patch_addr */
332 int host1x_syncpt_patch_wait(struct host1x_syncpt
*sp
, void *patch_addr
)
334 return host1x_hw_syncpt_patch_wait(sp
->host
, sp
, patch_addr
);
337 int host1x_syncpt_init(struct host1x
*host
)
339 struct host1x_syncpt_base
*bases
;
340 struct host1x_syncpt
*syncpt
;
343 syncpt
= devm_kzalloc(host
->dev
, sizeof(*syncpt
) * host
->info
->nb_pts
,
348 bases
= devm_kzalloc(host
->dev
, sizeof(*bases
) * host
->info
->nb_bases
,
353 for (i
= 0; i
< host
->info
->nb_pts
; i
++) {
355 syncpt
[i
].host
= host
;
358 for (i
= 0; i
< host
->info
->nb_bases
; i
++)
361 host
->syncpt
= syncpt
;
364 host1x_syncpt_restore(host
);
366 /* Allocate sync point to use for clearing waits for expired fences */
367 host
->nop_sp
= host1x_syncpt_alloc(host
, NULL
, 0);
374 struct host1x_syncpt
*host1x_syncpt_request(struct device
*dev
,
377 struct host1x
*host
= dev_get_drvdata(dev
->parent
);
378 return host1x_syncpt_alloc(host
, dev
, flags
);
381 void host1x_syncpt_free(struct host1x_syncpt
*sp
)
386 host1x_syncpt_base_free(sp
->base
);
391 sp
->client_managed
= false;
394 void host1x_syncpt_deinit(struct host1x
*host
)
397 struct host1x_syncpt
*sp
= host
->syncpt
;
398 for (i
= 0; i
< host
->info
->nb_pts
; i
++, sp
++)
403 * Read max. It indicates how many operations there are in queue, either in
404 * channel or in a software thread.
406 u32
host1x_syncpt_read_max(struct host1x_syncpt
*sp
)
409 return (u32
)atomic_read(&sp
->max_val
);
413 * Read min, which is a shadow of the current sync point value in hardware.
415 u32
host1x_syncpt_read_min(struct host1x_syncpt
*sp
)
418 return (u32
)atomic_read(&sp
->min_val
);
421 int host1x_syncpt_nb_pts(struct host1x
*host
)
423 return host
->info
->nb_pts
;
426 int host1x_syncpt_nb_bases(struct host1x
*host
)
428 return host
->info
->nb_bases
;
431 int host1x_syncpt_nb_mlocks(struct host1x
*host
)
433 return host
->info
->nb_mlocks
;
436 struct host1x_syncpt
*host1x_syncpt_get(struct host1x
*host
, u32 id
)
438 if (host
->info
->nb_pts
< id
)
440 return host
->syncpt
+ id
;
443 struct host1x_syncpt_base
*host1x_syncpt_get_base(struct host1x_syncpt
*sp
)
445 return sp
? sp
->base
: NULL
;
448 u32
host1x_syncpt_base_id(struct host1x_syncpt_base
*base
)