[Intel-gfx] HDCP as a Kconfig option

Daniel Vetter daniel at ffwll.ch
Mon Dec 4 21:24:35 UTC 2017


I understand there there's concerns about the content protection
stuff, but please note:

- The patches under discussion enforce nothing, they only allow you to
enable HDCP if you chose to do so. For real content protection you
need a complete system, locked down with secure boot or similar. I
think any user concerned about their software freedoms knows to avoid
such systems like the plague.

- Second, the code doesn't run by default at all. You can try to
enable HDCP only by explicitly requesting content protection through a
drm property (which I think should be exposed to xrandr by default at
least for the modesetting driver). Enterprising users can try out what
happens if they want to, but by default nothing at all happens. So no
risk of random breakage due to this.

Given those two reasons I don't think we need a Kconfig option to
disable the code even harder. I hope that explains the situation, and
why the patches don't have a Kconfig option from the start.

Also thanks very much for reaching out to developers instead of
everyone else who just panics on forums and passes around silly
conspiracy theories. We definitely don't want to merge code which
would hurt our users, that would kinda defeat the point of doing an
open source driver. I don't think this is the case here.

Cheers, Daniel

On Mon, Dec 4, 2017 at 2:20 AM, A. Wilcox <awilfox at adelielinux.org> wrote:
> Hash: SHA256
> (Note: I am not subscribed to the list, please cc me with replies.)
> Hello i915 developers,
> I represent Adélie Linux, a Linux distribution that has the goal of
> empowering users through the true freedom that only libre software can
> provide.  This new HDCP support patch for i915 has generated a lot of
> talking in our community, because even though it is 'open source' it
> implements hardware DRM.  We feel this to not be in the spirit of
> libre software.  Hardware DRM unevenly puts all of the control in the
> hands of hardware manufacturers and content producers, instead of with
> the people who have paid their hard-earned money to support them.
> In addition, different hardware supports different versions of HDCP,
> and in some cases, display panels and hardware cannot even speak the
> same version, which ends up being a nightmare for users who do not
> understand how video links work and just want to see a picture on
> their monitor.
> As such, we, the Adélie Linux distribution, respectfully request that
> the HDCP support – if added to the i915 driver (and if this is later
> factored out to generic code, then the generic framework itself) – be
> controllable via a CONFIG_ option in Kconfig, so that we may remove
> the entire feature from the module in our kernel package.
> Thank you very much for your time and consideration.
> Regards,
> - --arw
> - --
> A. Wilcox (awilfox)
> Project Lead, Adélie Linux
> http://adelielinux.org
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Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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