[PATCH 5/6] drm/i915/gvt: Add helper for tuning MMIO hash table

[Zhenyu Wang]

On 2017.06.02 14:03:50 +0800, changbin.du at intel.com wrote:
> From: Changbin Du <changbin.du at intel.com>
> 
> We count all the tracked virtual MMIO registers, which can help us to
> tune the MMIO hash table.
> 
> Signed-off-by: Changbin Du <changbin.du at intel.com>
> ---
>  drivers/gpu/drm/i915/gvt/handlers.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
> index bc68752..8f1a727 100644
> --- a/drivers/gpu/drm/i915/gvt/handlers.c
> +++ b/drivers/gpu/drm/i915/gvt/handlers.c
> @@ -47,6 +47,8 @@
>  #define PCH_PP_OFF_DELAYS _MMIO(0xc720c)
>  #define PCH_PP_DIVISOR _MMIO(0xc7210)
>  
> +static unsigned int num_tracked_mmio;
> +
>  unsigned long intel_gvt_get_device_type(struct intel_gvt *gvt)
>  {
>  	if (IS_BROADWELL(gvt->dev_priv))
> @@ -124,6 +126,7 @@ static int new_mmio_info(struct intel_gvt *gvt,
>  		gvt->mmio.mmio_attribute[info->offset / 4] = flags;
>  		INIT_HLIST_NODE(&info->node);
>  		hash_add(gvt->mmio.mmio_info_table, &info->node, info->offset);
> +		num_tracked_mmio++;
>  	}
>  	return 0;
>  }
> @@ -2917,6 +2920,8 @@ int intel_gvt_setup_mmio_info(struct intel_gvt *gvt)
>  		if (ret)
>  			goto err;
>  	}
> +
> +	gvt_dbg_mmio("traced %u virtual mmio registers\n", num_tracked_mmio);
>  	return 0;
>  err:
>  	intel_gvt_clean_mmio_info(gvt);

might better to put in intel_gvt, whenever we'd do debugfs thing can
be retrieved from there.

-- 
Open Source Technology Center, Intel ltd.

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