On Fri, Apr 22, 2016 at 05:04:04PM +0530, sourab.gupta@xxxxxxxxx wrote:
> +static u64 get_current_gpu_ts(struct drm_i915_private *dev_priv)
> +{
> + return ((u64)I915_READ(GT_TIMESTAMP_COUNT_UDW) << 32) |
> + I915_READ(GT_TIMESTAMP_COUNT);
return I915_READ64_2x32(GT_TIMESTAMP_COUNT, GT_TIMESTAMP_COUNT_UDW);
> +static void i915_perf_get_clock(struct drm_i915_private *dev_priv,
> + u64 *clk_mono, u64 *gpu_time, u64 *gpu_ts)
> +{
> + u64 remainder, ts_interval = NSEC_PER_SEC;
> + u32 gpu_freq = dev_priv->perf.timestamp_frequency;
> + unsigned long flags;
> +
> + local_irq_save(flags);
> + *clk_mono = ktime_get_mono_fast_ns();
> + *gpu_ts = get_current_gpu_ts(dev_priv);
> + local_irq_restore(flags);
> +
> + remainder = do_div(ts_interval, gpu_freq);
> + remainder *= *gpu_ts;
> + do_div(remainder, gpu_freq);
> +
> + *gpu_time = ((*gpu_ts) * ts_interval) + remainder;
> +}
> +
> +static void i915_perf_clock_sync_work(struct work_struct *work)
> +{
Have you looked at cross-timestamps?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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