[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, "%02d-%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;
	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);
}
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 = 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_base *bases;
	struct host1x_syncpt *syncpt;
	int i;

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

	bases = devm_kzalloc(host->dev, sizeof(*bases) * host->info->nb_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)
{
	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);
}
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);

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;
}
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
75471687 TB	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;
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;
	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	*/
	126	void 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	*/
	146	u32 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	*/
	158	u32 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
75471687 TB	166	/*
	167	* Increment syncpoint value from cpu, updating cache
	168	*/
ebae30b1	169	int host1x_syncpt_incr(struct host1x_syncpt *sp)
75471687	170	{
ebae30b1	171	return host1x_hw_syncpt_cpu_incr(sp->host, sp);
75471687	172	}
fae798a1	173	EXPORT_SYMBOL(host1x_syncpt_incr);
75471687	174
7ede0b0b TB	175	/*
	176	* Updated sync point form hardware, and returns true if syncpoint is expired,
	177	* false if we may need to wait
	178	*/
	179	static 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	*/
	188	int 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);
6236451d TB	261
	262	host1x_debug_dump_syncpts(sp->host);
	263	if (check_count == MAX_STUCK_CHECK_COUNT)
	264	host1x_debug_dump(sp->host);
7ede0b0b TB	265	check_count++;
	266	}
	267	}
	268	host1x_intr_put_ref(sp->host, sp->id, ref);
	269
	270	done:
	271	return err;
	272	}
	273	EXPORT_SYMBOL(host1x_syncpt_wait);
	274
	275	/*
	276	* Returns true if syncpoint is expired, false if we may need to wait
	277	*/
	278	bool 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
6579324a TB	334	/* remove a wait pointed to by patch_addr */
	335	int 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
75471687 TB	340	int host1x_syncpt_init(struct host1x *host)
75471687 TB	341	{
f5a954fe	342	struct host1x_syncpt_base *bases;
75471687 TB	343	struct host1x_syncpt *syncpt;
	344	int i;
	345
	346	syncpt = devm_kzalloc(host->dev, sizeof(syncpt) host->info->nb_pts,
f5a954fe	347	GFP_KERNEL);
75471687 TB	348	if (!syncpt)
	349	return -ENOMEM;
	350
f5a954fe AM	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++) {
75471687 TB	357	syncpt[i].id = i;
	358	syncpt[i].host = host;
	359	}
	360
f5a954fe AM	361	for (i = 0; i < host->info->nb_bases; i++)
	362	bases[i].id = i;
	363
75471687	364	host->syncpt = syncpt;
f5a954fe	365	host->bases = bases;
75471687 TB	366
	367	host1x_syncpt_restore(host);
	368
6579324a	369	/* Allocate sync point to use for clearing waits for expired fences */
8736fe81	370	host->nop_sp = host1x_syncpt_alloc(host, NULL, 0);
6579324a TB	371	if (!host->nop_sp)
	372	return -ENOMEM;
	373
75471687 TB	374	return 0;
	375	}
	376
	377	struct host1x_syncpt host1x_syncpt_request(struct device dev,
8736fe81	378	unsigned long flags)
75471687 TB	379	{
75471687 TB	380	struct host1x *host = dev_get_drvdata(dev->parent);
8736fe81	381	return host1x_syncpt_alloc(host, dev, flags);
75471687	382	}
fae798a1	383	EXPORT_SYMBOL(host1x_syncpt_request);
75471687 TB	384
	385	void host1x_syncpt_free(struct host1x_syncpt *sp)
	386	{
	387	if (!sp)
	388	return;
	389
f5a954fe	390	host1x_syncpt_base_free(sp->base);
75471687	391	kfree(sp->name);
f5a954fe	392	sp->base = NULL;
75471687 TB	393	sp->dev = NULL;
75471687 TB	394	sp->name = NULL;
ece66891	395	sp->client_managed = false;
75471687	396	}
fae798a1	397	EXPORT_SYMBOL(host1x_syncpt_free);
75471687 TB	398
	399	void 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
35d747a8 TR	407	/*
	408	* Read max. It indicates how many operations there are in queue, either in
	409	* channel or in a software thread.
	410	* */
	411	u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
	412	{
	413	smp_rmb();
	414	return (u32)atomic_read(&sp->max_val);
	415	}
fae798a1	416	EXPORT_SYMBOL(host1x_syncpt_read_max);
35d747a8 TR	417
	418	/*
	419	* Read min, which is a shadow of the current sync point value in hardware.
	420	*/
	421	u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
	422	{
	423	smp_rmb();
	424	return (u32)atomic_read(&sp->min_val);
	425	}
fae798a1	426	EXPORT_SYMBOL(host1x_syncpt_read_min);
35d747a8	427
75471687 TB	428	int host1x_syncpt_nb_pts(struct host1x *host)
	429	{
	430	return host->info->nb_pts;
	431	}
	432
	433	int host1x_syncpt_nb_bases(struct host1x *host)
	434	{
	435	return host->info->nb_bases;
	436	}
	437
	438	int host1x_syncpt_nb_mlocks(struct host1x *host)
	439	{
	440	return host->info->nb_mlocks;
	441	}
	442
	443	struct host1x_syncpt host1x_syncpt_get(struct host1x host, u32 id)
	444	{
	445	if (host->info->nb_pts < id)
	446	return NULL;
	447	return host->syncpt + id;
	448	}
fae798a1	449	EXPORT_SYMBOL(host1x_syncpt_get);
f5a954fe AM	450
	451	struct host1x_syncpt_base host1x_syncpt_get_base(struct host1x_syncpt sp)
	452	{
	453	return sp ? sp->base : NULL;
	454	}
fae798a1	455	EXPORT_SYMBOL(host1x_syncpt_get_base);
f5a954fe AM	456
	457	u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
	458	{
	459	return base->id;
	460	}
fae798a1	461	EXPORT_SYMBOL(host1x_syncpt_base_id);