[Intel-gfx] [PATCH] drm/i915: Export total subslice and EU counts

[Jeff McGee]

On Mon, Mar 02, 2015 at 03:37:32PM -0800, jeff.mcgee at intel.com wrote:
> From: Jeff McGee <jeff.mcgee at intel.com>
> 
> Setup new I915_GETPARAM ioctl entries for subslice total and
> EU total. Userspace drivers need these values when constructing
> GPGPU commands. This kernel query method is intended to replace
> the PCI ID-based tables that userspace drivers currently maintain.
> The kernel driver can employ fuse register reads as needed to
> ensure the most accurate determination of GT config attributes.
> This first became important with Cherryview in which the config
> could differ between devices with the same PCI ID.
> 
> The kernel detection of these values is device-specific and not
> included in this patch. Because zero is not a valid value for any of
> these parameters, a value of zero is interpreted as unknown for the
> device. Userspace drivers should continue to maintain ID-based tables
> for older devices not supported by the new query method.
> 

We already have total EU detection support for Cherryview but we
need to add detection of total subslice. That support is included
in the below-linked series which has been reviewed but not yet
merged.

http://lists.freedesktop.org/archives/intel-gfx/2015-February/060945.html

Jeff