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 | |
16 | static 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 | |
39 | static 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 |