Re: [PATCH 1/3] drm/i915: add rc6 residency times to debugfs

[Ben Widawsky <ben@bwidawsk.net>]

On Sat, 24 Mar 2012 19:09:44 -0700
Ben Widawsky <ben@bwidawsk.net> wrote:

> RC6 residency should be in intervals of 1.28us, and the counter wraps.
> Here is an example using awk to get the various RC6 and RC6+ residency
> times in seconds, since boot.
> 
> cat /sys/kernel/debug/dri/0/i915_drpc_info  | grep residency | awk
> -F':' -F' '  '{print $5 * 1.28 / 1000000}'
> 
> This is primarily for QA, but has other applications as well. An
> upcoming patch to add interfaces should be more interesting to
> application developers.
> 
> CC: Ouping Zhang <ouping.zhang@intel.com>
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
> Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c |   11 +++++++++++
>  drivers/gpu/drm/i915/i915_reg.h     |    5 +++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c index 66c90d4..72457ff 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1133,6 +1133,17 @@ static int gen6_drpc_info(struct seq_file *m)
>  
>  	seq_printf(m, "Core Power Down: %s\n",
>  		   yesno(gt_core_status & GEN6_CORE_CPD_STATE_MASK));
> +
> +	seq_printf(m, "RC6 \"Locked to RPn\" residency since boot:
> %d\n",
> +		   I915_READ(GEN6_GT_GFX_RC6_LOCKED));
> +	/* Not exactly sure what this is */
> +	seq_printf(m, "RC6 residency since boot: %d\n",
> +		   I915_READ(GEN6_GT_GFX_RC6));
> +	seq_printf(m, "RC6+ residency since boot: %d\n",
> +		   I915_READ(GEN6_GT_GFX_RC6p));
> +	seq_printf(m, "RC6++ residency since boot: %d\n",
> +		   I915_READ(GEN6_GT_GFX_RC6pp));
> +
>  	return 0;
>  }

As noted in patch 3, this was a stale patch, and the comment belongs
for the Locked to RPn.

>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index f3609f2..b1c3d35 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3799,6 +3799,11 @@
>  						 GEN6_PM_RP_DOWN_THRESHOLD
> | \ GEN6_PM_RP_DOWN_TIMEOUT)
>  
> +#define GEN6_GT_GFX_RC6_LOCKED			0x138104
> +#define GEN6_GT_GFX_RC6				0x138108
> +#define GEN6_GT_GFX_RC6p			0x13810C
> +#define GEN6_GT_GFX_RC6pp			0x138110
> +
>  #define GEN6_PCODE_MAILBOX			0x138124
>  #define   GEN6_PCODE_READY			(1<<31)
>  #define   GEN6_READ_OC_PARAMS			0xc