Re: [PATCH 2/2] drm/i915/guc: Turn on GuC/HuC auto mode

["Ye, Tony" <tony.ye@intel.com>]

On 7/10/2019 10:27 PM, Michal Wajdeczko wrote:
> On Tue, 09 Jul 2019 16:17:02 +0200, Joonas Lahtinen
> <joonas.lahtinen@linux.intel.com> wrote:
>
>> Better subject would be: "Enable HuC (through GuC) on supported 
>> platforms"
>
> Such subject sounds better, but on one hand it does not reflect real
> code change (since we are not explicitly enabling HuC, but instead we
> are just letting the driver enable GuC/HuC to whatever mode it decides),
> but on other hand this is what actual outcome of the change is (as i915
> currently enables GuC loading with HuC authentication on every platform
> where corresponding firmwares are defined/available, and nothing more).
>
> Please confirm if you still opt-in to use your subject.
>
>>
>> Quoting Michal Wajdeczko (2019-07-03 14:36:40)
>>> GuC firmware is now mature, so let it run by default.
>>
>> That's bit of a misleading statement (in more than one way).
>
> It's mature enough to perform HuC authentication, and we
> don't expect more from it ;)
>
>>
>> "Enable loading HuC firmware (through GuC) to unlock
>> advanced video codecs on supported platforms.
>>
>> GuC firmware is required to authenticate the HuC firmware,
>> which is a requirement for it to operate."
>
> To some extend this duplicates existing "DOC: HuC Firmware"
> Do we need to repeat that again here?
>
>>
>> Has the most recent firmware been merged to linux-firmware and
>> is it present in our CI systems?
>
> My understanding is: No and Yes.
> Maybe Anusha can provide more details here.
>
>>
>> It would also be good to list what kind of tests have been run
>> to ensure that there are no regressions,
>
> I'm afraid on IGT level we don't have HuC tests.
> But media team was using modparam override to force GuC/HuC for
> a while, Tony do you have such test list/results handy?

HuC functionality has been tested with AVC VDENC/HEVC VDENC/VP9VDENC 
encoding test cases in regular CI.

Thanks, -Tony

>
>> and which platforms
>> this change affects.
>
> This change affects all platforms where we have GuC/HuC firmwares
> defined, so: SKL, BXT, KBL, CFL, ICL.
>
> Note that we'll still have possibility to tweak that inside
> driver, as auto mode is just moving responsibility what can
> be enabled from the user to the i915.
>
>>
>> Regards, Joonas
>>
>>> Note that today GuC is only used for HuC authentication.
>>>
>>> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
>>> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
>>> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
>>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>>> ---
>>>  drivers/gpu/drm/i915/i915_params.h | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/i915_params.h 
>>> b/drivers/gpu/drm/i915/i915_params.h
>>> index d29ade3b7de6..5736c55694fe 100644
>>> --- a/drivers/gpu/drm/i915/i915_params.h
>>> +++ b/drivers/gpu/drm/i915/i915_params.h
>>> @@ -54,7 +54,7 @@ struct drm_printer;
>>>         param(int, disable_power_well, -1) \
>>>         param(int, enable_ips, 1) \
>>>         param(int, invert_brightness, 0) \
>>> -       param(int, enable_guc, 0) \
>>> +       param(int, enable_guc, -1) \
>>>         param(int, guc_log_level, -1) \
>>>         param(char *, guc_firmware_path, NULL) \
>>>         param(char *, huc_firmware_path, NULL) \
>>> -- 
>>> 2.19.2
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