[Intel-gfx] [PATCH 2/3] drm/i915/huc: Check HuC firmware status only once

[Ye, Tony]

> 在 2019年5月23日，上午4:14，Chris Wilson <chris at chris-wilson.co.uk> 写道：
> 
> Quoting Michal Wajdeczko (2019-05-22 20:00:56)
>> During driver load we checked that HuC firmware was verified, and once
>> verified it stays verified, so there is no need to check that again.
>> 
>> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
>> Cc: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Tony Ye <tony.ye at intel.com>
> 
> Makes sense to me as purely a code monkey.
> 
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> I would like a second opinion from someone who knows the innards of the
> HuC to confirm that indeed once verified, it remains verified. And if it
> can change, we need to report the change in status to userspace (or they
> just hang and the gpu + huc gets reset).
> -Chris
UMD doesn’t authenticate HuC. It only reads the authentication status. So as long as KMD/GuC verified it, it keeps verified.
Regards, -Tony