intel_engine_stats.h revision 1.1 
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	unsigned long flags;
19
20	if (engine->stats.active) {
21		engine->stats.active++;
22		return;
23	}
24
25	/* The writer is serialised; but the pmu reader may be from hardirq */
26	local_irq_save(flags);
27	write_seqcount_begin(&engine->stats.lock);
28
29	engine->stats.start = ktime_get();
30	engine->stats.active++;
31
32	write_seqcount_end(&engine->stats.lock);
33	local_irq_restore(flags);
34
35	GEM_BUG_ON(!engine->stats.active);
36}
37
38static inline void intel_engine_context_out(struct intel_engine_cs *engine)
39{
40	unsigned long flags;
41
42	GEM_BUG_ON(!engine->stats.active);
43	if (engine->stats.active > 1) {
44		engine->stats.active--;
45		return;
46	}
47
48	local_irq_save(flags);
49	write_seqcount_begin(&engine->stats.lock);
50
51	engine->stats.active--;
52	engine->stats.total =
53		ktime_add(engine->stats.total,
54			  ktime_sub(ktime_get(), engine->stats.start));
55
56	write_seqcount_end(&engine->stats.lock);
57	local_irq_restore(flags);
58}
59
60#endif /* __INTEL_ENGINE_STATS_H__ */
61