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