[PATCH 4/5] drm/vgem: getparam ioctl

[Dave Airlie]

On Wed, Feb 15, 2012 at 9:22 PM, Adam Jackson <ajax at redhat.com> wrote:
> On 2/8/12 6:19 PM, Ben Widawsky wrote:
>>
>> Similar to i915, it's nice to be able to query this device uniquely and
>> get some info
>>
>> Signed-off-by: Ben Widawsky<ben at bwidawsk.net>
>
>
> So, this is actually not especially useful as written.  You'd like to be
> able to use this to find the vgem device node, but since it's a
> device-specific ioctl it collides with whatever happens to be
> device-specific ioctl number 2 on whatever device you've opened.  On i915,
> that's I915_FLIP, and you promptly oops the machine.
>

We have DRM level caps that we could use for that if necessary.

I'm not sure we need a getparam for vgem if the only thing it reports
is VGEM status.

Though yeah what ajax said looking in /sys is the discovery path of choice.

Dave.