Re: [PATCH 08/11] drm/i915/skl: Updated the i915_frequency_info debugfs function

From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: akash.goel@intel.com
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 08/11] drm/i915/skl: Updated the i915_frequency_info debugfs function
Date: Wed, 11 Mar 2015 22:48:03 +0200	[thread overview]
Message-ID: <20150311204803.GA11371@intel.com> (raw)
In-Reply-To: <1425620244-12637-9-git-send-email-akash.goel@intel.com>

On Fri, Mar 06, 2015 at 11:07:21AM +0530, akash.goel@intel.com wrote:
> From: Akash Goel <akash.goel@intel.com>
> 
> Added support for SKL in the i915_frequency_info debugfs function
> 
> v2:
> - corrected the handling of reqf (Damien)
> - Reorderd the platform check for cagf (Ville)
> 
> Signed-off-by: Akash Goel <akash.goel@intel.com>

Had to dig up the PM docs for the GT_PERF_STATUS, but with the right
docs it all looks good to me.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index f9b5a97..e97de3cc 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1090,7 +1090,7 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
>  		seq_printf(m, "Current P-state: %d\n",
>  			   (rgvstat & MEMSTAT_PSTATE_MASK) >> MEMSTAT_PSTATE_SHIFT);
>  	} else if (IS_GEN6(dev) || (IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) ||
> -		   IS_BROADWELL(dev)) {
> +		   IS_BROADWELL(dev) || IS_GEN9(dev)) {
>  		u32 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
>  		u32 rp_state_limits = I915_READ(GEN6_RP_STATE_LIMITS);
>  		u32 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
> @@ -1109,11 +1109,15 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
>  		intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
>  
>  		reqf = I915_READ(GEN6_RPNSWREQ);
> -		reqf &= ~GEN6_TURBO_DISABLE;
> -		if (IS_HASWELL(dev) || IS_BROADWELL(dev))
> -			reqf >>= 24;
> -		else
> -			reqf >>= 25;
> +		if (IS_GEN9(dev))
> +			reqf >>= 23;
> +		else {
> +			reqf &= ~GEN6_TURBO_DISABLE;
> +			if (IS_HASWELL(dev) || IS_BROADWELL(dev))
> +				reqf >>= 24;
> +			else
> +				reqf >>= 25;
> +		}
>  		reqf = intel_gpu_freq(dev_priv, reqf);
>  
>  		rpmodectl = I915_READ(GEN6_RP_CONTROL);
> @@ -1127,7 +1131,9 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
>  		rpdownei = I915_READ(GEN6_RP_CUR_DOWN_EI);
>  		rpcurdown = I915_READ(GEN6_RP_CUR_DOWN);
>  		rpprevdown = I915_READ(GEN6_RP_PREV_DOWN);
> -		if (IS_HASWELL(dev) || IS_BROADWELL(dev))
> +		if (IS_GEN9(dev))
> +			cagf = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
> +		else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
>  			cagf = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
>  		else
>  			cagf = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
> @@ -1153,7 +1159,7 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
>  			   pm_ier, pm_imr, pm_isr, pm_iir, pm_mask);
>  		seq_printf(m, "GT_PERF_STATUS: 0x%08x\n", gt_perf_status);
>  		seq_printf(m, "Render p-state ratio: %d\n",
> -			   (gt_perf_status & 0xff00) >> 8);
> +			   (gt_perf_status & (IS_GEN9(dev) ? 0x1ff00 : 0xff00)) >> 8);
>  		seq_printf(m, "Render p-state VID: %d\n",
>  			   gt_perf_status & 0xff);
>  		seq_printf(m, "Render p-state limit: %d\n",
> @@ -1178,14 +1184,17 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
>  			   GEN6_CURBSYTAVG_MASK);
>  
>  		max_freq = (rp_state_cap & 0xff0000) >> 16;
> +		max_freq *= (IS_SKYLAKE(dev) ? GEN9_FREQ_SCALER : 1);
>  		seq_printf(m, "Lowest (RPN) frequency: %dMHz\n",
>  			   intel_gpu_freq(dev_priv, max_freq));
>  
>  		max_freq = (rp_state_cap & 0xff00) >> 8;
> +		max_freq *= (IS_SKYLAKE(dev) ? GEN9_FREQ_SCALER : 1);
>  		seq_printf(m, "Nominal (RP1) frequency: %dMHz\n",
>  			   intel_gpu_freq(dev_priv, max_freq));
>  
>  		max_freq = rp_state_cap & 0xff;
> +		max_freq *= (IS_SKYLAKE(dev) ? GEN9_FREQ_SCALER : 1);
>  		seq_printf(m, "Max non-overclocked (RP0) frequency: %dMHz\n",
>  			   intel_gpu_freq(dev_priv, max_freq));
>  
> -- 
> 1.9.2
> 
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-- 
Ville Syrjälä
Intel OTC
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