[deliverable/linux.git] / drivers / gpu / host1x / syncpt.c

/*
 * Tegra host1x Syncpoints
 *
 * Copyright (c) 2010-2013, NVIDIA Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>

#include <trace/events/host1x.h>

#include "syncpt.h"
#include "dev.h"
#include "intr.h"
#include "debug.h"

#define SYNCPT_CHECK_PERIOD (2 * HZ)
#define MAX_STUCK_CHECK_COUNT 15

static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host,
						  struct device *dev,
						  bool client_managed)
{
	int i;
	struct host1x_syncpt *sp = host->syncpt;
	char *name;

	for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
		;

	if (i >= host->info->nb_pts)
		return NULL;

	name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id,
			dev ? dev_name(dev) : NULL);
	if (!name)
		return NULL;

	sp->dev = dev;
	sp->name = name;
	sp->client_managed = client_managed;

	return sp;
}

u32 host1x_syncpt_id(struct host1x_syncpt *sp)
{
	return sp->id;
}

/*
 * Updates the value sent to hardware.
 */
u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
{
	return (u32)atomic_add_return(incrs, &sp->max_val);
}

 /*
 * Write cached syncpoint and waitbase values to hardware.
 */
void host1x_syncpt_restore(struct host1x *host)
{
	struct host1x_syncpt *sp_base = host->syncpt;
	u32 i;

	for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
		host1x_hw_syncpt_restore(host, sp_base + i);
	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
		host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
	wmb();
}

/*
 * Update the cached syncpoint and waitbase values by reading them
 * from the registers.
  */
void host1x_syncpt_save(struct host1x *host)
{
	struct host1x_syncpt *sp_base = host->syncpt;
	u32 i;

	for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
		if (host1x_syncpt_client_managed(sp_base + i))
			host1x_hw_syncpt_load(host, sp_base + i);
		else
			WARN_ON(!host1x_syncpt_idle(sp_base + i));
	}

	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
		host1x_hw_syncpt_load_wait_base(host, sp_base + i);
}

/*
 * Updates the cached syncpoint value by reading a new value from the hardware
 * register
 */
u32 host1x_syncpt_load(struct host1x_syncpt *sp)
{
	u32 val;
	val = host1x_hw_syncpt_load(sp->host, sp);
	trace_host1x_syncpt_load_min(sp->id, val);

	return val;
}

/*
 * Get the current syncpoint base
 */
u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
{
	u32 val;
	host1x_hw_syncpt_load_wait_base(sp->host, sp);
	val = sp->base_val;
	return val;
}

/*
 * Increment syncpoint value from cpu, updating cache
 */
int host1x_syncpt_incr(struct host1x_syncpt *sp)
{
	return host1x_hw_syncpt_cpu_incr(sp->host, sp);
}

/*
 * Updated sync point form hardware, and returns true if syncpoint is expired,
 * false if we may need to wait
 */
static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
{
	host1x_hw_syncpt_load(sp->host, sp);
	return host1x_syncpt_is_expired(sp, thresh);
}

/*
 * Main entrypoint for syncpoint value waits.
 */
int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
			u32 *value)
{
	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
	void *ref;
	struct host1x_waitlist *waiter;
	int err = 0, check_count = 0;
	u32 val;

	if (value)
		*value = 0;

	/* first check cache */
	if (host1x_syncpt_is_expired(sp, thresh)) {
		if (value)
			*value = host1x_syncpt_load(sp);
		return 0;
	}

	/* try to read from register */
	val = host1x_hw_syncpt_load(sp->host, sp);
	if (host1x_syncpt_is_expired(sp, thresh)) {
		if (value)
			*value = val;
		goto done;
	}

	if (!timeout) {
		err = -EAGAIN;
		goto done;
	}

	/* allocate a waiter */
	waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
	if (!waiter) {
		err = -ENOMEM;
		goto done;
	}

	/* schedule a wakeup when the syncpoint value is reached */
	err = host1x_intr_add_action(sp->host, sp->id, thresh,
				     HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
				     &wq, waiter, &ref);
	if (err)
		goto done;

	err = -EAGAIN;
	/* Caller-specified timeout may be impractically low */
	if (timeout < 0)
		timeout = LONG_MAX;

	/* wait for the syncpoint, or timeout, or signal */
	while (timeout) {
		long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
		int remain = wait_event_interruptible_timeout(wq,
				syncpt_load_min_is_expired(sp, thresh),
				check);
		if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) {
			if (value)
				*value = host1x_syncpt_load(sp);
			err = 0;
			break;
		}
		if (remain < 0) {
			err = remain;
			break;
		}
		timeout -= check;
		if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
			dev_warn(sp->host->dev,
				"%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n",
				 current->comm, sp->id, sp->name,
				 thresh, timeout);

			host1x_debug_dump_syncpts(sp->host);
			if (check_count == MAX_STUCK_CHECK_COUNT)
				host1x_debug_dump(sp->host);
			check_count++;
		}
	}
	host1x_intr_put_ref(sp->host, sp->id, ref);

done:
	return err;
}
EXPORT_SYMBOL(host1x_syncpt_wait);

/*
 * Returns true if syncpoint is expired, false if we may need to wait
 */
bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
{
	u32 current_val;
	u32 future_val;
	smp_rmb();
	current_val = (u32)atomic_read(&sp->min_val);
	future_val = (u32)atomic_read(&sp->max_val);

	/* Note the use of unsigned arithmetic here (mod 1<<32).
	 *
	 * c = current_val = min_val	= the current value of the syncpoint.
	 * t = thresh			= the value we are checking
	 * f = future_val  = max_val	= the value c will reach when all
	 *				  outstanding increments have completed.
	 *
	 * Note that c always chases f until it reaches f.
	 *
	 * Dtf = (f - t)
	 * Dtc = (c - t)
	 *
	 *  Consider all cases:
	 *
	 *	A) .....c..t..f.....	Dtf < Dtc	need to wait
	 *	B) .....c.....f..t..	Dtf > Dtc	expired
	 *	C) ..t..c.....f.....	Dtf > Dtc	expired	   (Dct very large)
	 *
	 *  Any case where f==c: always expired (for any t).	Dtf == Dcf
	 *  Any case where t==c: always expired (for any f).	Dtf >= Dtc (because Dtc==0)
	 *  Any case where t==f!=c: always wait.		Dtf <  Dtc (because Dtf==0,
	 *							Dtc!=0)
	 *
	 *  Other cases:
	 *
	 *	A) .....t..f..c.....	Dtf < Dtc	need to wait
	 *	A) .....f..c..t.....	Dtf < Dtc	need to wait
	 *	A) .....f..t..c.....	Dtf > Dtc	expired
	 *
	 *   So:
	 *	   Dtf >= Dtc implies EXPIRED	(return true)
	 *	   Dtf <  Dtc implies WAIT	(return false)
	 *
	 * Note: If t is expired then we *cannot* wait on it. We would wait
	 * forever (hang the system).
	 *
	 * Note: do NOT get clever and remove the -thresh from both sides. It
	 * is NOT the same.
	 *
	 * If future valueis zero, we have a client managed sync point. In that
	 * case we do a direct comparison.
	 */
	if (!host1x_syncpt_client_managed(sp))
		return future_val - thresh >= current_val - thresh;
	else
		return (s32)(current_val - thresh) >= 0;
}

/* remove a wait pointed to by patch_addr */
int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
{
	return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr);
}

int host1x_syncpt_init(struct host1x *host)
{
	struct host1x_syncpt *syncpt;
	int i;

	syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts,
		GFP_KERNEL);
	if (!syncpt)
		return -ENOMEM;

	for (i = 0; i < host->info->nb_pts; ++i) {
		syncpt[i].id = i;
		syncpt[i].host = host;
	}

	host->syncpt = syncpt;

	host1x_syncpt_restore(host);

	/* Allocate sync point to use for clearing waits for expired fences */
	host->nop_sp = _host1x_syncpt_alloc(host, NULL, false);
	if (!host->nop_sp)
		return -ENOMEM;

	return 0;
}

struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
					    bool client_managed)
{
	struct host1x *host = dev_get_drvdata(dev->parent);
	return _host1x_syncpt_alloc(host, dev, client_managed);
}

void host1x_syncpt_free(struct host1x_syncpt *sp)
{
	if (!sp)
		return;

	kfree(sp->name);
	sp->dev = NULL;
	sp->name = NULL;
	sp->client_managed = false;
}

void host1x_syncpt_deinit(struct host1x *host)
{
	int i;
	struct host1x_syncpt *sp = host->syncpt;
	for (i = 0; i < host->info->nb_pts; i++, sp++)
		kfree(sp->name);
}

/*
 * Read max. It indicates how many operations there are in queue, either in
 * channel or in a software thread.
 * */
u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
{
	smp_rmb();
	return (u32)atomic_read(&sp->max_val);
}

/*
 * Read min, which is a shadow of the current sync point value in hardware.
 */
u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
{
	smp_rmb();
	return (u32)atomic_read(&sp->min_val);
}

int host1x_syncpt_nb_pts(struct host1x *host)
{
	return host->info->nb_pts;
}

int host1x_syncpt_nb_bases(struct host1x *host)
{
	return host->info->nb_bases;
}

int host1x_syncpt_nb_mlocks(struct host1x *host)
{
	return host->info->nb_mlocks;
}

struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id)
{
	if (host->info->nb_pts < id)
		return NULL;
	return host->syncpt + id;
}
Commit	Line	Data
75471687 TB	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"
7ede0b0b	27	#include "intr.h"
6236451d	28	#include "debug.h"
7ede0b0b TB	29
	30	#define SYNCPT_CHECK_PERIOD (2 * HZ)
	31	#define MAX_STUCK_CHECK_COUNT 15
75471687 TB	32
	33	static struct host1x_syncpt _host1x_syncpt_alloc(struct host1x host,
	34	struct device *dev,
ece66891	35	bool client_managed)
75471687 TB	36	{
	37	int i;
	38	struct host1x_syncpt *sp = host->syncpt;
	39	char *name;
	40
	41	for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
	42	;
edeabfcb AM	43
edeabfcb AM	44	if (i >= host->info->nb_pts)
75471687 TB	45	return NULL;
	46
	47	name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id,
	48	dev ? dev_name(dev) : NULL);
	49	if (!name)
	50	return NULL;
	51
	52	sp->dev = dev;
	53	sp->name = name;
	54	sp->client_managed = client_managed;
	55
	56	return sp;
	57	}
	58
	59	u32 host1x_syncpt_id(struct host1x_syncpt *sp)
	60	{
	61	return sp->id;
	62	}
	63
	64	/*
	65	* Updates the value sent to hardware.
	66	*/
	67	u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
	68	{
	69	return (u32)atomic_add_return(incrs, &sp->max_val);
	70	}
	71
	72	/*
	73	* Write cached syncpoint and waitbase values to hardware.
	74	*/
	75	void host1x_syncpt_restore(struct host1x *host)
	76	{
	77	struct host1x_syncpt *sp_base = host->syncpt;
	78	u32 i;
	79
	80	for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
	81	host1x_hw_syncpt_restore(host, sp_base + i);
	82	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
	83	host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
	84	wmb();
	85	}
	86
	87	/*
	88	* Update the cached syncpoint and waitbase values by reading them
	89	* from the registers.
	90	*/
	91	void host1x_syncpt_save(struct host1x *host)
	92	{
	93	struct host1x_syncpt *sp_base = host->syncpt;
	94	u32 i;
	95
	96	for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
	97	if (host1x_syncpt_client_managed(sp_base + i))
	98	host1x_hw_syncpt_load(host, sp_base + i);
	99	else
	100	WARN_ON(!host1x_syncpt_idle(sp_base + i));
	101	}
	102
	103	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
	104	host1x_hw_syncpt_load_wait_base(host, sp_base + i);
	105	}
	106
	107	/*
	108	* Updates the cached syncpoint value by reading a new value from the hardware
109	* register
110	*/
111	u32 host1x_syncpt_load(struct host1x_syncpt *sp)
112	{
113	u32 val;
114	val = host1x_hw_syncpt_load(sp->host, sp);
115	trace_host1x_syncpt_load_min(sp->id, val);
116
117	return val;
118	}
119
120	/*
121	* Get the current syncpoint base
122	*/
123	u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
124	{
125	u32 val;
126	host1x_hw_syncpt_load_wait_base(sp->host, sp);
127	val = sp->base_val;
128	return val;
129	}
130
75471687 TB	131	/*
	132	* Increment syncpoint value from cpu, updating cache
	133	*/
ebae30b1	134	int host1x_syncpt_incr(struct host1x_syncpt *sp)
75471687	135	{
ebae30b1	136	return host1x_hw_syncpt_cpu_incr(sp->host, sp);
75471687 TB	137	}
75471687 TB	138
7ede0b0b TB	139	/*
	140	* Updated sync point form hardware, and returns true if syncpoint is expired,
	141	* false if we may need to wait
	142	*/
	143	static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
	144	{
	145	host1x_hw_syncpt_load(sp->host, sp);
	146	return host1x_syncpt_is_expired(sp, thresh);
	147	}
	148
	149	/*
	150	* Main entrypoint for syncpoint value waits.
	151	*/
	152	int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
	153	u32 *value)
	154	{
	155	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
	156	void *ref;
	157	struct host1x_waitlist *waiter;
	158	int err = 0, check_count = 0;
	159	u32 val;
	160
	161	if (value)
	162	*value = 0;
	163
	164	/* first check cache */
	165	if (host1x_syncpt_is_expired(sp, thresh)) {
	166	if (value)
	167	*value = host1x_syncpt_load(sp);
	168	return 0;
	169	}
	170
	171	/* try to read from register */
	172	val = host1x_hw_syncpt_load(sp->host, sp);
	173	if (host1x_syncpt_is_expired(sp, thresh)) {
	174	if (value)
	175	*value = val;
	176	goto done;
	177	}
	178
	179	if (!timeout) {
	180	err = -EAGAIN;
	181	goto done;
	182	}
	183
	184	/* allocate a waiter */
	185	waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
	186	if (!waiter) {
	187	err = -ENOMEM;
	188	goto done;
	189	}
	190
	191	/* schedule a wakeup when the syncpoint value is reached */
	192	err = host1x_intr_add_action(sp->host, sp->id, thresh,
	193	HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
	194	&wq, waiter, &ref);
	195	if (err)
	196	goto done;
	197
	198	err = -EAGAIN;
	199	/* Caller-specified timeout may be impractically low */
	200	if (timeout < 0)
	201	timeout = LONG_MAX;
	202
203	/* wait for the syncpoint, or timeout, or signal */
204	while (timeout) {
205	long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
206	int remain = wait_event_interruptible_timeout(wq,
207	syncpt_load_min_is_expired(sp, thresh),
208	check);
209	if (remain > 0 \|\| host1x_syncpt_is_expired(sp, thresh)) {
210	if (value)
211	*value = host1x_syncpt_load(sp);
212	err = 0;
213	break;
214	}
215	if (remain < 0) {
216	err = remain;
217	break;
218	}
219	timeout -= check;
220	if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
221	dev_warn(sp->host->dev,
222	"%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n",
223	current->comm, sp->id, sp->name,
224	thresh, timeout);
6236451d TB	225
	226	host1x_debug_dump_syncpts(sp->host);
	227	if (check_count == MAX_STUCK_CHECK_COUNT)
	228	host1x_debug_dump(sp->host);
7ede0b0b TB	229	check_count++;
	230	}
	231	}
	232	host1x_intr_put_ref(sp->host, sp->id, ref);
	233
	234	done:
	235	return err;
	236	}
	237	EXPORT_SYMBOL(host1x_syncpt_wait);
	238
	239	/*
	240	* Returns true if syncpoint is expired, false if we may need to wait
	241	*/
	242	bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
	243	{
	244	u32 current_val;
	245	u32 future_val;
	246	smp_rmb();
	247	current_val = (u32)atomic_read(&sp->min_val);
	248	future_val = (u32)atomic_read(&sp->max_val);
	249
	250	/* Note the use of unsigned arithmetic here (mod 1<<32).
	251	*
	252	* c = current_val = min_val = the current value of the syncpoint.
	253	* t = thresh = the value we are checking
	254	* f = future_val = max_val = the value c will reach when all
	255	* outstanding increments have completed.
	256	*
	257	* Note that c always chases f until it reaches f.
	258	*
	259	* Dtf = (f - t)
	260	* Dtc = (c - t)
	261	*
	262	* Consider all cases:
	263	*
	264	* A) .....c..t..f..... Dtf < Dtc need to wait
	265	* B) .....c.....f..t.. Dtf > Dtc expired
	266	* C) ..t..c.....f..... Dtf > Dtc expired (Dct very large)
	267	*
	268	* Any case where f==c: always expired (for any t). Dtf == Dcf
	269	* Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0)
	270	* Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0,
	271	* Dtc!=0)
	272	*
	273	* Other cases:
	274	*
	275	* A) .....t..f..c..... Dtf < Dtc need to wait
	276	* A) .....f..c..t..... Dtf < Dtc need to wait
	277	* A) .....f..t..c..... Dtf > Dtc expired
	278	*
	279	* So:
	280	* Dtf >= Dtc implies EXPIRED (return true)
	281	* Dtf < Dtc implies WAIT (return false)
	282	*
	283	* Note: If t is expired then we cannot wait on it. We would wait
	284	* forever (hang the system).
	285	*
	286	* Note: do NOT get clever and remove the -thresh from both sides. It
	287	* is NOT the same.
	288	*
	289	* If future valueis zero, we have a client managed sync point. In that
	290	* case we do a direct comparison.
	291	*/
	292	if (!host1x_syncpt_client_managed(sp))
293	return future_val - thresh >= current_val - thresh;
294	else
295	return (s32)(current_val - thresh) >= 0;
296	}
297
6579324a TB	298	/* remove a wait pointed to by patch_addr */
	299	int host1x_syncpt_patch_wait(struct host1x_syncpt sp, void patch_addr)
	300	{
	301	return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr);
	302	}
	303
75471687 TB	304	int host1x_syncpt_init(struct host1x *host)
	305	{
	306	struct host1x_syncpt *syncpt;
	307	int i;
	308
	309	syncpt = devm_kzalloc(host->dev, sizeof(syncpt) host->info->nb_pts,
	310	GFP_KERNEL);
	311	if (!syncpt)
	312	return -ENOMEM;
	313
	314	for (i = 0; i < host->info->nb_pts; ++i) {
	315	syncpt[i].id = i;
	316	syncpt[i].host = host;
	317	}
	318
	319	host->syncpt = syncpt;
	320
	321	host1x_syncpt_restore(host);
	322
6579324a	323	/* Allocate sync point to use for clearing waits for expired fences */
ece66891	324	host->nop_sp = _host1x_syncpt_alloc(host, NULL, false);
6579324a TB	325	if (!host->nop_sp)
	326	return -ENOMEM;
	327
75471687 TB	328	return 0;
	329	}
	330
	331	struct host1x_syncpt host1x_syncpt_request(struct device dev,
ece66891	332	bool client_managed)
75471687 TB	333	{
	334	struct host1x *host = dev_get_drvdata(dev->parent);
	335	return _host1x_syncpt_alloc(host, dev, client_managed);
	336	}
	337
	338	void host1x_syncpt_free(struct host1x_syncpt *sp)
	339	{
	340	if (!sp)
	341	return;
	342
	343	kfree(sp->name);
	344	sp->dev = NULL;
	345	sp->name = NULL;
ece66891	346	sp->client_managed = false;
75471687 TB	347	}
	348
	349	void host1x_syncpt_deinit(struct host1x *host)
	350	{
	351	int i;
	352	struct host1x_syncpt *sp = host->syncpt;
	353	for (i = 0; i < host->info->nb_pts; i++, sp++)
	354	kfree(sp->name);
	355	}
	356
35d747a8 TR	357	/*
	358	* Read max. It indicates how many operations there are in queue, either in
	359	* channel or in a software thread.
	360	* */
	361	u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
	362	{
	363	smp_rmb();
	364	return (u32)atomic_read(&sp->max_val);
	365	}
	366
	367	/*
	368	* Read min, which is a shadow of the current sync point value in hardware.
	369	*/
	370	u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
	371	{
	372	smp_rmb();
	373	return (u32)atomic_read(&sp->min_val);
	374	}
	375
75471687 TB	376	int host1x_syncpt_nb_pts(struct host1x *host)
	377	{
	378	return host->info->nb_pts;
	379	}
	380
	381	int host1x_syncpt_nb_bases(struct host1x *host)
	382	{
	383	return host->info->nb_bases;
	384	}
	385
	386	int host1x_syncpt_nb_mlocks(struct host1x *host)
	387	{
	388	return host->info->nb_mlocks;
	389	}
	390
	391	struct host1x_syncpt host1x_syncpt_get(struct host1x host, u32 id)
	392	{
	393	if (host->info->nb_pts < id)
	394	return NULL;
	395	return host->syncpt + id;
	396	}