[Intel-gfx] intel_gpu_top missing clocks

[Bragg, Robert]

Hi Chris,

You can query the nominal and maximum frequency of your GPU via debugfs, in
case that is good enough for your needs. Depending on what kernel version
you have you can try to cat /sys/kernel/debug/dri/0/i915_cur_delayinfo or
with more recent versions, /sys/kernel/debug/dri/0/i915_frequency_info

If you are curious about more details then it may be best to look at the
drm driver code in
drivers/gpu/drm/i915/i915_debugfs.c:i915_frequency_info().

--
Regards,
Robert

On Wed, Jun 18, 2014 at 1:55 AM, He, Shuang <shuang.he at intel.com> wrote:

>  Hi, Chris
>
>          Let’s put you to the correct Mailing list for this topic first
>
>
>
> Thanks
>
>          --Shuang
>
> *From:* Chris Healy [mailto:cphealy at gmail.com]
> *Sent:* Wednesday, June 18, 2014 1:15 AM
> *To:* Eric Anholt; He, Shuang
> *Subject:* intel_gpu_top missing clocks
>
>
>
> Eric, Shuang,
>
> I couldn't find an appropriate mailing list to report this on, so I'm
> mailing the two of you as you've both touched the clock code in
> intel_gpu_top.
>
> I'm running an Ivy Bridge Mobile chipset and trying to use intel_gpu_top
> and intel_stepping to see the GPU clock frequencies.  In both cases, the
> clocks are "unknown".
>
> When I look at the code, it seems that there's just no code path to handle
> this devid, though I'm not sure as I'm not very good at understanding
> code.  I see in intel_chipset.h that device id 0x0166 =
> PCI_CHIP_IVYBRIDGE_M_GT2 and that none of the "if's" in print_clock_info
> ultimately point to this device type.
>
> Do either of you know why this would be?  Is it just a case of coding for
> the majority of chipset configurations?
>
> If it's just the case of it not yet being handled, I'd be open to trying
> to add support for it if you could point me to the necessary chip
> documentation.
>
> Regards,
>
> Chris
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
>
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