drivers/gpu/drm/i915/gt/intel_engine_stats.h

   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__ */