[Intel-gfx] [PATCH 1/2] drm/i915/guc: Add GuC Load time to dmesg log.

[Chris Wilson]

Quoting David Weinehall (2017-11-01 13:38:48)
> On Tue, Oct 31, 2017 at 05:11:20PM -0700, Anusha Srivatsa wrote:
> > Calculate the time that GuC takes to load using
> > jiffies. This information could be very useful in
> > determining if GuC is taking unreasonably long time
> > to load in a certain platforms.
> > 
> > v2: Calculate time before logs are collected.
> > Move the guc_load_time variable as a part of
> > intel_uc_fw struct. Store only final result
> > which is to be exported to debugfs. (Michal)
> > Add the load time in the print message as well.
> > 
> > v3: Remove debugfs entry. Remove local variable
> > guc_finish_load. (Daniel, Tvrtko)
> > 
> > v4: Use ktime_get() instead of jiffies. Use DRM_NOTE
> > if time taken to load is more than the threshold. On
> > load times within acceptable range, use DRM_DEBUG_DRIVER
> > (Tvrtko)
> > 
> > v5: Rebased. Do not expose the load time variable in a global
> > struct (Tvrtko, Joonas)
> 
> From my point of view (measuring suspend/resume times) knowing
> how much time is spent loading GuC & HuC is really useful,
> so it's definitely useful information.

This information could be gleaned from ftrace...
-Chris