[linux-block.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);
}

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