[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_base *
host1x_syncpt_base_request(struct host1x *host)
{
	struct host1x_syncpt_base *bases = host->bases;
	unsigned int i;

	for (i = 0; i < host->info->nb_bases; i++)
		if (!bases[i].requested)
			break;

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

	bases[i].requested = true;
	return &bases[i];
}

static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
{
	if (base)
		base->requested = false;
}

static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
						 struct device *dev,
						 unsigned long flags)
{
	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;

	if (flags & HOST1X_SYNCPT_HAS_BASE) {
		sp->base = host1x_syncpt_base_request(host);
		if (!sp->base)
			return NULL;
	}

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

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

	if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
		sp->client_managed = true;
	else
		sp->client_managed = false;

	return sp;
}

u32 host1x_syncpt_id(struct host1x_syncpt *sp)
{
	return sp->id;
}
EXPORT_SYMBOL(host1x_syncpt_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);
}
EXPORT_SYMBOL(host1x_syncpt_incr_max);

 /*
 * Write cached syncpoint and waitbase values to hardware.
 */
void host1x_syncpt_restore(struct host1x *host)
{
	struct host1x_syncpt *sp_base = host->syncpt;
	unsigned int 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;
	unsigned int 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)
{
	host1x_hw_syncpt_load_wait_base(sp->host, sp);

	return sp->base_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);
}
EXPORT_SYMBOL(host1x_syncpt_incr);

/*
 * 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;

		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 %u (%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_base *bases;
	struct host1x_syncpt *syncpt;
	unsigned int i;

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

	bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
			     GFP_KERNEL);
	if (!bases)
		return -ENOMEM;

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

	for (i = 0; i < host->info->nb_bases; i++)
		bases[i].id = i;

	host->syncpt = syncpt;
	host->bases = bases;

	host1x_syncpt_restore(host);

	/* Allocate sync point to use for clearing waits for expired fences */
	host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
	if (!host->nop_sp)
		return -ENOMEM;

	return 0;
}

struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
					    unsigned long flags)
{
	struct host1x *host = dev_get_drvdata(dev->parent);

	return host1x_syncpt_alloc(host, dev, flags);
}
EXPORT_SYMBOL(host1x_syncpt_request);

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

	host1x_syncpt_base_free(sp->base);
	kfree(sp->name);
	sp->base = NULL;
	sp->dev = NULL;
	sp->name = NULL;
	sp->client_managed = false;
}
EXPORT_SYMBOL(host1x_syncpt_free);

void host1x_syncpt_deinit(struct host1x *host)
{
	struct host1x_syncpt *sp = host->syncpt;
	unsigned int i;

	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);
}
EXPORT_SYMBOL(host1x_syncpt_read_max);

/*
 * 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);
}
EXPORT_SYMBOL(host1x_syncpt_read_min);

u32 host1x_syncpt_read(struct host1x_syncpt *sp)
{
	return host1x_syncpt_load(sp);
}
EXPORT_SYMBOL(host1x_syncpt_read);

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

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

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

struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, unsigned int id)
{
	if (host->info->nb_pts < id)
		return NULL;

	return host->syncpt + id;
}
EXPORT_SYMBOL(host1x_syncpt_get);

struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
{
	return sp ? sp->base : NULL;
}
EXPORT_SYMBOL(host1x_syncpt_get_base);

u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
{
	return base->id;
}
EXPORT_SYMBOL(host1x_syncpt_base_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	32
f5a954fe AM	33	static struct host1x_syncpt_base *
	34	host1x_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
	50	static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
	51	{
	52	if (base)
	53	base->requested = false;
	54	}
	55
8736fe81 AM	56	static struct host1x_syncpt host1x_syncpt_alloc(struct host1x host,
	57	struct device *dev,
	58	unsigned long flags)
75471687 TB	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	;
edeabfcb AM	66
edeabfcb AM	67	if (i >= host->info->nb_pts)
75471687 TB	68	return NULL;
75471687 TB	69
f5a954fe AM	70	if (flags & HOST1X_SYNCPT_HAS_BASE) {
	71	sp->base = host1x_syncpt_base_request(host);
	72	if (!sp->base)
	73	return NULL;
	74	}
	75
5c0d8d38	76	name = kasprintf(GFP_KERNEL, "%02u-%s", sp->id,
75471687 TB	77	dev ? dev_name(dev) : NULL);
	78	if (!name)
	79	return NULL;
	80
	81	sp->dev = dev;
	82	sp->name = name;
8736fe81 AM	83
	84	if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
	85	sp->client_managed = true;
	86	else
	87	sp->client_managed = false;
75471687 TB	88
	89	return sp;
	90	}
	91
	92	u32 host1x_syncpt_id(struct host1x_syncpt *sp)
	93	{
	94	return sp->id;
	95	}
fae798a1	96	EXPORT_SYMBOL(host1x_syncpt_id);
75471687 TB	97
	98	/*
	99	* Updates the value sent to hardware.
	100	*/
	101	u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
	102	{
	103	return (u32)atomic_add_return(incrs, &sp->max_val);
	104	}
64400c37	105	EXPORT_SYMBOL(host1x_syncpt_incr_max);
75471687 TB	106
	107	/*
	108	* Write cached syncpoint and waitbase values to hardware.
	109	*/
	110	void host1x_syncpt_restore(struct host1x *host)
	111	{
	112	struct host1x_syncpt *sp_base = host->syncpt;
14c95fc8	113	unsigned int i;
75471687 TB	114
	115	for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
	116	host1x_hw_syncpt_restore(host, sp_base + i);
0b8070d1	117
75471687 TB	118	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
75471687 TB	119	host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
0b8070d1	120
75471687 TB	121	wmb();
	122	}
	123
	124	/*
	125	* Update the cached syncpoint and waitbase values by reading them
	126	* from the registers.
	127	*/
	128	void host1x_syncpt_save(struct host1x *host)
	129	{
	130	struct host1x_syncpt *sp_base = host->syncpt;
14c95fc8	131	unsigned int i;
75471687 TB	132
	133	for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
	134	if (host1x_syncpt_client_managed(sp_base + i))
	135	host1x_hw_syncpt_load(host, sp_base + i);
	136	else
	137	WARN_ON(!host1x_syncpt_idle(sp_base + i));
	138	}
	139
	140	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
	141	host1x_hw_syncpt_load_wait_base(host, sp_base + i);
	142	}
	143
	144	/*
	145	* Updates the cached syncpoint value by reading a new value from the hardware
	146	* register
	147	*/
	148	u32 host1x_syncpt_load(struct host1x_syncpt *sp)
	149	{
	150	u32 val;
6df633d0	151
75471687 TB	152	val = host1x_hw_syncpt_load(sp->host, sp);
	153	trace_host1x_syncpt_load_min(sp->id, val);
	154
	155	return val;
	156	}
	157
	158	/*
	159	* Get the current syncpoint base
	160	*/
	161	u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
	162	{
75471687	163	host1x_hw_syncpt_load_wait_base(sp->host, sp);
4b92e294 TR	164
4b92e294 TR	165	return sp->base_val;
75471687 TB	166	}
75471687 TB	167
75471687 TB	168	/*
	169	* Increment syncpoint value from cpu, updating cache
	170	*/
ebae30b1	171	int host1x_syncpt_incr(struct host1x_syncpt *sp)
75471687	172	{
ebae30b1	173	return host1x_hw_syncpt_cpu_incr(sp->host, sp);
75471687	174	}
fae798a1	175	EXPORT_SYMBOL(host1x_syncpt_incr);
75471687	176
7ede0b0b TB	177	/*
	178	* Updated sync point form hardware, and returns true if syncpoint is expired,
	179	* false if we may need to wait
	180	*/
	181	static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh)
	182	{
	183	host1x_hw_syncpt_load(sp->host, sp);
0b8070d1	184
7ede0b0b TB	185	return host1x_syncpt_is_expired(sp, thresh);
	186	}
	187
	188	/*
	189	* Main entrypoint for syncpoint value waits.
	190	*/
	191	int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
0b8070d1	192	u32 *value)
7ede0b0b TB	193	{
	194	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
	195	void *ref;
	196	struct host1x_waitlist *waiter;
	197	int err = 0, check_count = 0;
	198	u32 val;
	199
	200	if (value)
	201	*value = 0;
	202
	203	/* first check cache */
	204	if (host1x_syncpt_is_expired(sp, thresh)) {
	205	if (value)
	206	*value = host1x_syncpt_load(sp);
0b8070d1	207
7ede0b0b TB	208	return 0;
	209	}
	210
	211	/* try to read from register */
	212	val = host1x_hw_syncpt_load(sp->host, sp);
	213	if (host1x_syncpt_is_expired(sp, thresh)) {
	214	if (value)
	215	*value = val;
0b8070d1	216
7ede0b0b TB	217	goto done;
	218	}
	219
	220	if (!timeout) {
	221	err = -EAGAIN;
	222	goto done;
	223	}
	224
	225	/* allocate a waiter */
	226	waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
	227	if (!waiter) {
	228	err = -ENOMEM;
	229	goto done;
	230	}
	231
	232	/* schedule a wakeup when the syncpoint value is reached */
	233	err = host1x_intr_add_action(sp->host, sp->id, thresh,
	234	HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
	235	&wq, waiter, &ref);
	236	if (err)
	237	goto done;
	238
	239	err = -EAGAIN;
	240	/* Caller-specified timeout may be impractically low */
	241	if (timeout < 0)
	242	timeout = LONG_MAX;
	243
	244	/* wait for the syncpoint, or timeout, or signal */
	245	while (timeout) {
	246	long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout);
0b8070d1 TR	247	int remain;
	248
	249	remain = wait_event_interruptible_timeout(wq,
7ede0b0b TB	250	syncpt_load_min_is_expired(sp, thresh),
	251	check);
	252	if (remain > 0 \|\| host1x_syncpt_is_expired(sp, thresh)) {
	253	if (value)
	254	*value = host1x_syncpt_load(sp);
0b8070d1	255
7ede0b0b	256	err = 0;
0b8070d1	257
7ede0b0b TB	258	break;
7ede0b0b TB	259	}
0b8070d1	260
7ede0b0b TB	261	if (remain < 0) {
	262	err = remain;
	263	break;
	264	}
0b8070d1	265
7ede0b0b	266	timeout -= check;
0b8070d1	267
7ede0b0b TB	268	if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
7ede0b0b TB	269	dev_warn(sp->host->dev,
5c0d8d38	270	"%s: syncpoint id %u (%s) stuck waiting %d, timeout=%ld\n",
7ede0b0b TB	271	current->comm, sp->id, sp->name,
7ede0b0b TB	272	thresh, timeout);
6236451d TB	273
6236451d TB	274	host1x_debug_dump_syncpts(sp->host);
0b8070d1	275
6236451d TB	276	if (check_count == MAX_STUCK_CHECK_COUNT)
6236451d TB	277	host1x_debug_dump(sp->host);
0b8070d1	278
7ede0b0b TB	279	check_count++;
	280	}
	281	}
0b8070d1	282
7ede0b0b TB	283	host1x_intr_put_ref(sp->host, sp->id, ref);
	284
	285	done:
	286	return err;
	287	}
	288	EXPORT_SYMBOL(host1x_syncpt_wait);
	289
	290	/*
	291	* Returns true if syncpoint is expired, false if we may need to wait
	292	*/
	293	bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
	294	{
	295	u32 current_val;
	296	u32 future_val;
6df633d0	297
7ede0b0b	298	smp_rmb();
0b8070d1	299
7ede0b0b TB	300	current_val = (u32)atomic_read(&sp->min_val);
	301	future_val = (u32)atomic_read(&sp->max_val);
	302
	303	/* Note the use of unsigned arithmetic here (mod 1<<32).
	304	*
	305	* c = current_val = min_val = the current value of the syncpoint.
	306	* t = thresh = the value we are checking
	307	* f = future_val = max_val = the value c will reach when all
	308	* outstanding increments have completed.
	309	*
	310	* Note that c always chases f until it reaches f.
	311	*
	312	* Dtf = (f - t)
	313	* Dtc = (c - t)
	314	*
	315	* Consider all cases:
	316	*
	317	* A) .....c..t..f..... Dtf < Dtc need to wait
	318	* B) .....c.....f..t.. Dtf > Dtc expired
	319	* C) ..t..c.....f..... Dtf > Dtc expired (Dct very large)
	320	*
	321	* Any case where f==c: always expired (for any t). Dtf == Dcf
	322	* Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0)
	323	* Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0,
	324	* Dtc!=0)
	325	*
	326	* Other cases:
	327	*
	328	* A) .....t..f..c..... Dtf < Dtc need to wait
	329	* A) .....f..c..t..... Dtf < Dtc need to wait
	330	* A) .....f..t..c..... Dtf > Dtc expired
	331	*
	332	* So:
	333	* Dtf >= Dtc implies EXPIRED (return true)
	334	* Dtf < Dtc implies WAIT (return false)
	335	*
	336	* Note: If t is expired then we cannot wait on it. We would wait
	337	* forever (hang the system).
	338	*
	339	* Note: do NOT get clever and remove the -thresh from both sides. It
	340	* is NOT the same.
	341	*
	342	* If future valueis zero, we have a client managed sync point. In that
	343	* case we do a direct comparison.
	344	*/
	345	if (!host1x_syncpt_client_managed(sp))
	346	return future_val - thresh >= current_val - thresh;
	347	else
	348	return (s32)(current_val - thresh) >= 0;
	349	}
	350
6579324a TB	351	/* remove a wait pointed to by patch_addr */
	352	int host1x_syncpt_patch_wait(struct host1x_syncpt sp, void patch_addr)
	353	{
	354	return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr);
	355	}
	356
75471687 TB	357	int host1x_syncpt_init(struct host1x *host)
75471687 TB	358	{
f5a954fe	359	struct host1x_syncpt_base *bases;
75471687	360	struct host1x_syncpt *syncpt;
14c95fc8	361	unsigned int i;
75471687	362
b47a0491	363	syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
f5a954fe	364	GFP_KERNEL);
75471687 TB	365	if (!syncpt)
	366	return -ENOMEM;
	367
b47a0491	368	bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
f5a954fe AM	369	GFP_KERNEL);
	370	if (!bases)
	371	return -ENOMEM;
	372
	373	for (i = 0; i < host->info->nb_pts; i++) {
75471687 TB	374	syncpt[i].id = i;
	375	syncpt[i].host = host;
	376	}
	377
f5a954fe AM	378	for (i = 0; i < host->info->nb_bases; i++)
	379	bases[i].id = i;
	380
75471687	381	host->syncpt = syncpt;
f5a954fe	382	host->bases = bases;
75471687 TB	383
	384	host1x_syncpt_restore(host);
	385
6579324a	386	/* Allocate sync point to use for clearing waits for expired fences */
8736fe81	387	host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
6579324a TB	388	if (!host->nop_sp)
	389	return -ENOMEM;
	390
75471687 TB	391	return 0;
	392	}
	393
	394	struct host1x_syncpt host1x_syncpt_request(struct device dev,
8736fe81	395	unsigned long flags)
75471687 TB	396	{
75471687 TB	397	struct host1x *host = dev_get_drvdata(dev->parent);
0b8070d1	398
8736fe81	399	return host1x_syncpt_alloc(host, dev, flags);
75471687	400	}
fae798a1	401	EXPORT_SYMBOL(host1x_syncpt_request);
75471687 TB	402
	403	void host1x_syncpt_free(struct host1x_syncpt *sp)
	404	{
	405	if (!sp)
	406	return;
	407
f5a954fe	408	host1x_syncpt_base_free(sp->base);
75471687	409	kfree(sp->name);
f5a954fe	410	sp->base = NULL;
75471687 TB	411	sp->dev = NULL;
75471687 TB	412	sp->name = NULL;
ece66891	413	sp->client_managed = false;
75471687	414	}
fae798a1	415	EXPORT_SYMBOL(host1x_syncpt_free);
75471687 TB	416
	417	void host1x_syncpt_deinit(struct host1x *host)
	418	{
75471687	419	struct host1x_syncpt *sp = host->syncpt;
14c95fc8 TR	420	unsigned int i;
14c95fc8 TR	421
75471687 TB	422	for (i = 0; i < host->info->nb_pts; i++, sp++)
	423	kfree(sp->name);
	424	}
	425
35d747a8 TR	426	/*
	427	* Read max. It indicates how many operations there are in queue, either in
	428	* channel or in a software thread.
6df633d0	429	*/
35d747a8 TR	430	u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
	431	{
	432	smp_rmb();
0b8070d1	433
35d747a8 TR	434	return (u32)atomic_read(&sp->max_val);
35d747a8 TR	435	}
fae798a1	436	EXPORT_SYMBOL(host1x_syncpt_read_max);
35d747a8 TR	437
	438	/*
	439	* Read min, which is a shadow of the current sync point value in hardware.
	440	*/
	441	u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
	442	{
	443	smp_rmb();
0b8070d1	444
35d747a8 TR	445	return (u32)atomic_read(&sp->min_val);
35d747a8 TR	446	}
fae798a1	447	EXPORT_SYMBOL(host1x_syncpt_read_min);
35d747a8	448
b4a20144 TR	449	u32 host1x_syncpt_read(struct host1x_syncpt *sp)
	450	{
	451	return host1x_syncpt_load(sp);
	452	}
	453	EXPORT_SYMBOL(host1x_syncpt_read);
	454
14c95fc8	455	unsigned int host1x_syncpt_nb_pts(struct host1x *host)
75471687 TB	456	{
	457	return host->info->nb_pts;
	458	}
	459
14c95fc8	460	unsigned int host1x_syncpt_nb_bases(struct host1x *host)
75471687 TB	461	{
	462	return host->info->nb_bases;
	463	}
	464
14c95fc8	465	unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
75471687 TB	466	{
	467	return host->info->nb_mlocks;
	468	}
	469
5c0d8d38	470	struct host1x_syncpt host1x_syncpt_get(struct host1x host, unsigned int id)
75471687 TB	471	{
	472	if (host->info->nb_pts < id)
	473	return NULL;
0b8070d1	474
75471687 TB	475	return host->syncpt + id;
75471687 TB	476	}
fae798a1	477	EXPORT_SYMBOL(host1x_syncpt_get);
f5a954fe AM	478
	479	struct host1x_syncpt_base host1x_syncpt_get_base(struct host1x_syncpt sp)
	480	{
	481	return sp ? sp->base : NULL;
	482	}
fae798a1	483	EXPORT_SYMBOL(host1x_syncpt_get_base);
f5a954fe AM	484
	485	u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
	486	{
	487	return base->id;
	488	}
fae798a1	489	EXPORT_SYMBOL(host1x_syncpt_base_id);