From be2cde9a6d922e5e43efd2ad39bc43ce70a5d79b Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 30 Aug 2012 13:26:48 +0200 Subject: [PATCH] drm/i915: add a tracepoint for gpu frequency changes We've had and still have too many issues where the gpu turbo doesn't quite to what it's supposed to do (or what we want it to do). Adding a tracepoint to track when the desired gpu frequency changes should help a lot in characterizing and understanding problematic workloads. Also, this should be fairly interesting for power tuning (and especially noticing when the gpu is stuck in high frequencies, as has happened in the past) and hence for integration into powertop and similar tools. Cc: Arjan van de Ven Reviewed-by: Chris Wilson Acked-by: Paul Menzel Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_trace.h | 15 +++++++++++++++ drivers/gpu/drm/i915/intel_pm.c | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h index 3c4093d91f6..8134421b89a 100644 --- a/drivers/gpu/drm/i915/i915_trace.h +++ b/drivers/gpu/drm/i915/i915_trace.h @@ -430,6 +430,21 @@ TRACE_EVENT(i915_reg_rw, (u32)(__entry->val >> 32)) ); +TRACE_EVENT(intel_gpu_freq_change, + TP_PROTO(u32 freq), + TP_ARGS(freq), + + TP_STRUCT__entry( + __field(u32, freq) + ), + + TP_fast_assign( + __entry->freq = freq; + ), + + TP_printk("new_freq=%u", __entry->freq) +); + #endif /* _I915_TRACE_H_ */ /* This part must be outside protection */ diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 8dc802c4ec7..7ae35821121 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2337,6 +2337,8 @@ void gen6_set_rps(struct drm_device *dev, u8 val) I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits); dev_priv->rps.cur_delay = val; + + trace_intel_gpu_freq_change(val * 50); } static void gen6_disable_rps(struct drm_device *dev) -- 2.20.1