| 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 |