[Intel-gfx] [PATCH 47/47] drm/i915/guc: Unblock GuC submission on Gen11+

[Pekka Paalanen]

On Thu, 1 Jul 2021 21:28:06 +0200
Daniel Vetter <daniel at ffwll.ch> wrote:

> On Thu, Jul 1, 2021 at 8:27 PM Martin Peres <martin.peres at free.fr> wrote:
> >
> > On 01/07/2021 11:14, Pekka Paalanen wrote:  
> > > On Wed, 30 Jun 2021 11:58:25 -0700
> > > John Harrison <john.c.harrison at intel.com> wrote:
> > >  
> > >> On 6/30/2021 01:22, Martin Peres wrote:  
> > >>> On 24/06/2021 10:05, Matthew Brost wrote:  
> > >>>> From: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> > >>>>
> > >>>> Unblock GuC submission on Gen11+ platforms.
> > >>>>
> > >>>> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
> > >>>> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> > >>>> Signed-off-by: Matthew Brost <matthew.brost at intel.com>
> > >>>> ---
> > >>>>    drivers/gpu/drm/i915/gt/uc/intel_guc.h            |  1 +
> > >>>>    drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c |  8 ++++++++
> > >>>>    drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h |  3 +--
> > >>>>    drivers/gpu/drm/i915/gt/uc/intel_uc.c             | 14 +++++++++-----
> > >>>>    4 files changed, 19 insertions(+), 7 deletions(-)
> > >>>>  
> > >
> > > ...
> > >  
> > >>>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> > >>>> b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> > >>>> index 7a69c3c027e9..61be0aa81492 100644
> > >>>> --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> > >>>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> > >>>> @@ -34,8 +34,15 @@ static void uc_expand_default_options(struct
> > >>>> intel_uc *uc)
> > >>>>            return;
> > >>>>        }
> > >>>>    -    /* Default: enable HuC authentication only */
> > >>>> -    i915->params.enable_guc = ENABLE_GUC_LOAD_HUC;
> > >>>> +    /* Intermediate platforms are HuC authentication only */
> > >>>> +    if (IS_DG1(i915) || IS_ALDERLAKE_S(i915)) {
> > >>>> +        drm_dbg(&i915->drm, "Disabling GuC only due to old
> > >>>> platform\n");  
> > >>>
> > >>> This comment does not seem accurate, given that DG1 is barely out, and
> > >>> ADL is not out yet. How about:
> > >>>
> > >>> "Disabling GuC on untested platforms"?
> > >>>  
> > >> Just because something is not in the shops yet does not mean it is new.
> > >> Technology is always obsolete by the time it goes on sale.  
> > >
> > > That is a very good reason to not use terminology like "new", "old",
> > > "current", "modern" etc. at all.
> > >
> > > End users like me definitely do not share your interpretation of "old".  
> >
> > Yep, old and new is relative. In the end, what matters is the validation
> > effort, which is why I was proposing "untested platforms".
> >
> > Also, remember that you are not writing these messages for Intel
> > engineers, but instead are writing for Linux *users*.  
> 
> It's drm_dbg. Users don't read this stuff, at least not users with no
> clue what the driver does and stuff like that.

If I had a problem, I would read it, and I have no clue what anything
of that is.


Thanks,
pq
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