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1/* SPDX-License-Identifier: MIT */2/*3 * Copyright © 2020 Intel Corporation4 */5 6#ifndef __INTEL_ENGINE_STATS_H__7#define __INTEL_ENGINE_STATS_H__8 9#include <linux/atomic.h>10#include <linux/ktime.h>11#include <linux/seqlock.h>12 13#include "i915_gem.h" /* GEM_BUG_ON */14#include "intel_engine.h"15 16static inline void intel_engine_context_in(struct intel_engine_cs *engine)17{18 struct intel_engine_execlists_stats *stats = &engine->stats.execlists;19 unsigned long flags;20 21 if (stats->active) {22 stats->active++;23 return;24 }25 26 /* The writer is serialised; but the pmu reader may be from hardirq */27 local_irq_save(flags);28 write_seqcount_begin(&stats->lock);29 30 stats->start = ktime_get();31 stats->active++;32 33 write_seqcount_end(&stats->lock);34 local_irq_restore(flags);35 36 GEM_BUG_ON(!stats->active);37}38 39static inline void intel_engine_context_out(struct intel_engine_cs *engine)40{41 struct intel_engine_execlists_stats *stats = &engine->stats.execlists;42 unsigned long flags;43 44 GEM_BUG_ON(!stats->active);45 if (stats->active > 1) {46 stats->active--;47 return;48 }49 50 local_irq_save(flags);51 write_seqcount_begin(&stats->lock);52 53 stats->active--;54 stats->total = ktime_add(stats->total,55 ktime_sub(ktime_get(), stats->start));56 57 write_seqcount_end(&stats->lock);58 local_irq_restore(flags);59}60 61#endif /* __INTEL_ENGINE_STATS_H__ */62