i915/gt/intel_engine_stats.h

0001 /* SPDX-License-Identifier: MIT */
0002 /*
0003  * Copyright © 2020 Intel Corporation
0004  */
0005
0006 #ifndef __INTEL_ENGINE_STATS_H__
0007 #define __INTEL_ENGINE_STATS_H__
0008
0009 #include <linux/atomic.h>
0010 #include <linux/ktime.h>
0011 #include <linux/seqlock.h>
0012
0013 #include "i915_gem.h" /* GEM_BUG_ON */
0014 #include "intel_engine.h"
0015
0016 static inline void intel_engine_context_in(struct intel_engine_cs *engine)
0017 {
0018     struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
0019     unsigned long flags;
0020
0021     if (stats->active) {
0022         stats->active++;
0023         return;
0024     }
0025
0026     /* The writer is serialised; but the pmu reader may be from hardirq */
0027     local_irq_save(flags);
0028     write_seqcount_begin(&stats->lock);
0029
0030     stats->start = ktime_get();
0031     stats->active++;
0032
0033     write_seqcount_end(&stats->lock);
0034     local_irq_restore(flags);
0035
0036     GEM_BUG_ON(!stats->active);
0037 }
0038
0039 static inline void intel_engine_context_out(struct intel_engine_cs *engine)
0040 {
0041     struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
0042     unsigned long flags;
0043
0044     GEM_BUG_ON(!stats->active);
0045     if (stats->active > 1) {
0046         stats->active--;
0047         return;
0048     }
0049
0050     local_irq_save(flags);
0051     write_seqcount_begin(&stats->lock);
0052
0053     stats->active--;
0054     stats->total = ktime_add(stats->total,
0055                  ktime_sub(ktime_get(), stats->start));
0056
0057     write_seqcount_end(&stats->lock);
0058     local_irq_restore(flags);
0059 }
0060
0061 #endif /* __INTEL_ENGINE_STATS_H__ */