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