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         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
  38 static 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__ */