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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2020 Intel Corporation
*/
#ifndef __INTEL_ENGINE_STATS_H__
#define __INTEL_ENGINE_STATS_H__
#include <linux/atomic.h>
#include <linux/ktime.h>
#include <linux/seqlock.h>
#include "i915_gem.h" /* GEM_BUG_ON */
#include "intel_engine.h"
static inline void intel_engine_context_in(struct intel_engine_cs *engine)
{
unsigned long flags;
if (engine->stats.active) {
engine->stats.active++;
return;
}
/* The writer is serialised; but the pmu reader may be from hardirq */
local_irq_save(flags);
write_seqcount_begin(&engine->stats.lock);
engine->stats.start = ktime_get();
engine->stats.active++;
write_seqcount_end(&engine->stats.lock);
local_irq_restore(flags);
GEM_BUG_ON(!engine->stats.active);
}
static inline void intel_engine_context_out(struct intel_engine_cs *engine)
{
unsigned long flags;
GEM_BUG_ON(!engine->stats.active);
if (engine->stats.active > 1) {
engine->stats.active--;
return;
}
local_irq_save(flags);
write_seqcount_begin(&engine->stats.lock);
engine->stats.active--;
engine->stats.total =
ktime_add(engine->stats.total,
ktime_sub(ktime_get(), engine->stats.start));
write_seqcount_end(&engine->stats.lock);
local_irq_restore(flags);
}
#endif /* __INTEL_ENGINE_STATS_H__ */
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