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/*
*
* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* @file mali_kbase_sync.c
*
*/
#ifdef CONFIG_SYNC
#include <linux/sync.h>
#include <kbase/src/common/mali_kbase.h>
struct mali_sync_timeline {
struct sync_timeline timeline;
atomic_t counter;
atomic_t signalled;
};
struct mali_sync_pt {
struct sync_pt pt;
u32 order;
int result;
};
static struct mali_sync_timeline *to_mali_sync_timeline(struct sync_timeline *timeline)
{
return container_of(timeline, struct mali_sync_timeline, timeline);
}
static struct mali_sync_pt *to_mali_sync_pt(struct sync_pt *pt)
{
return container_of(pt, struct mali_sync_pt, pt);
}
static struct sync_pt *timeline_dup(struct sync_pt *pt)
{
struct mali_sync_pt *mpt = to_mali_sync_pt(pt);
struct mali_sync_pt *new_mpt;
struct sync_pt *new_pt = sync_pt_create(pt->parent, sizeof(struct mali_sync_pt));
if (!new_pt)
return NULL;
new_mpt = to_mali_sync_pt(new_pt);
new_mpt->order = mpt->order;
new_mpt->result = mpt->result;
return new_pt;
}
static int timeline_has_signaled(struct sync_pt *pt)
{
struct mali_sync_pt *mpt = to_mali_sync_pt(pt);
struct mali_sync_timeline *mtl = to_mali_sync_timeline(pt->parent);
int result = mpt->result;
long diff = atomic_read(&mtl->signalled) - mpt->order;
if (diff >= 0)
{
return result < 0 ? result : 1;
}
else
return 0;
}
static int timeline_compare(struct sync_pt *a, struct sync_pt *b)
{
struct mali_sync_pt *ma = container_of(a, struct mali_sync_pt, pt);
struct mali_sync_pt *mb = container_of(b, struct mali_sync_pt, pt);
long diff = ma->order - mb->order;
if (diff < 0)
return -1;
else if (diff == 0)
return 0;
else
return 1;
}
static void timeline_value_str(struct sync_timeline *timeline, char * str,
int size)
{
struct mali_sync_timeline *mtl = to_mali_sync_timeline(timeline);
snprintf(str, size, "%d", atomic_read(&mtl->signalled));
}
static void pt_value_str(struct sync_pt *pt, char *str, int size)
{
struct mali_sync_pt *mpt = to_mali_sync_pt(pt);
snprintf(str, size, "%d(%d)", mpt->order, mpt->result);
}
static struct sync_timeline_ops mali_timeline_ops = {
.driver_name = "Mali",
.dup = timeline_dup,
.has_signaled = timeline_has_signaled,
.compare = timeline_compare,
.timeline_value_str = timeline_value_str,
.pt_value_str = pt_value_str,
#if 0
.free_pt = timeline_free_pt,
.release_obj = timeline_release_obj
#endif
};
int kbase_sync_timeline_is_ours(struct sync_timeline *timeline)
{
return timeline->ops == &mali_timeline_ops;
}
struct sync_timeline *kbase_sync_timeline_alloc(const char *name)
{
struct sync_timeline *tl;
struct mali_sync_timeline *mtl;
tl = sync_timeline_create(&mali_timeline_ops, sizeof(struct mali_sync_timeline), name);
if (!tl)
return NULL;
/* Set the counter in our private struct */
mtl = to_mali_sync_timeline(tl);
atomic_set(&mtl->counter, 0);
atomic_set(&mtl->signalled, 0);
return tl;
}
struct sync_pt *kbase_sync_pt_alloc(struct sync_timeline *parent)
{
struct sync_pt *pt = sync_pt_create(parent, sizeof(struct mali_sync_pt));
struct mali_sync_timeline *mtl = to_mali_sync_timeline(parent);
struct mali_sync_pt *mpt;
if (!pt)
return NULL;
mpt = to_mali_sync_pt(pt);
mpt->order = atomic_inc_return(&mtl->counter);
mpt->result = 0;
return pt;
}
void kbase_sync_signal_pt(struct sync_pt *pt, int result)
{
struct mali_sync_pt *mpt = to_mali_sync_pt(pt);
struct mali_sync_timeline *mtl = to_mali_sync_timeline(pt->parent);
int signalled;
long diff;
mpt->result = result;
do {
signalled = atomic_read(&mtl->signalled);
diff = signalled - mpt->order;
if (diff > 0) {
/* The timeline is already at or ahead of this point. This should not happen unless userspace
* has been signalling fences out of order, so warn but don't violate the sync_pt API.
* The warning is only in release builds to prevent a malicious user being able to spam dmesg.
*/
#ifdef CONFIG_MALI_DEBUG
KBASE_DEBUG_PRINT_ERROR(KBASE_JD, "Fences were triggered in a different order to allocation!");
#endif /* CONFIG_MALI_DEBUG */
return;
}
} while (atomic_cmpxchg(&mtl->signalled, signalled, mpt->order) != signalled);
}
#endif /* CONFIG_SYNC */
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