f530a41d13
As context-in/out is now always serialised, we do not have to worry about concurrent enabling/disable of the busy-stats and can reduce the atomic_t active to a plain unsigned int, and the seqlock to a seqcount. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210115142331.24458-3-chris@chris-wilson.co.uk
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2020 Intel Corporation
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*/
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#ifndef __INTEL_ENGINE_STATS_H__
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#define __INTEL_ENGINE_STATS_H__
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#include <linux/atomic.h>
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#include <linux/ktime.h>
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#include <linux/seqlock.h>
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#include "i915_gem.h" /* GEM_BUG_ON */
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#include "intel_engine.h"
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static inline void intel_engine_context_in(struct intel_engine_cs *engine)
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{
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unsigned long flags;
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if (engine->stats.active) {
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engine->stats.active++;
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return;
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}
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/* The writer is serialised; but the pmu reader may be from hardirq */
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local_irq_save(flags);
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write_seqcount_begin(&engine->stats.lock);
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engine->stats.start = ktime_get();
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engine->stats.active++;
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write_seqcount_end(&engine->stats.lock);
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local_irq_restore(flags);
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GEM_BUG_ON(!engine->stats.active);
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}
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static inline void intel_engine_context_out(struct intel_engine_cs *engine)
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{
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unsigned long flags;
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GEM_BUG_ON(!engine->stats.active);
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if (engine->stats.active > 1) {
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engine->stats.active--;
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return;
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}
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local_irq_save(flags);
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write_seqcount_begin(&engine->stats.lock);
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engine->stats.active--;
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engine->stats.total =
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ktime_add(engine->stats.total,
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ktime_sub(ktime_get(), engine->stats.start));
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write_seqcount_end(&engine->stats.lock);
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local_irq_restore(flags);
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}
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#endif /* __INTEL_ENGINE_STATS_H__ */
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