1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2020 Intel Corporation
4 */
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