On Thu, Jul 25, 2013 at 12:14:14AM +0200, Daniel Vetter wrote: > On Wed, Jul 24, 2013 at 10:22:48AM -0700, Jesse Barnes wrote: > > For use by userspace (at some point in the future) and other kernel code. > > > > Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> > > Note that this split isn't too useful for userspace in newer generations. > We still have the desktop/mobile split with since about ilk is meaningless > for actual kernel code. Only recently with the haswell ult this changed > again, but it's actually a different split. And userspace cares about gt1, > gt2, ... for threads counts, which is not something too important in > kernel land. But things like SKU (mobile, desktop GT1, GT1++) are nicely encoded into the PCI ID anyway (much to the horror of those who have to write the matching tables), making for a much simpler test. With the kernel's split, we can use the same listing in libdrm, intel-gpu-tools and the ddx, at least. We've gone from maintaining 6 distinct copies to 3, which is some improvement at least. (And I think the other 2 userspace copies could be converted.) An alternative strategy that would work for at least the same set of userspace is for the kernel to provide SKU details (desktop/mobile, gt, etc) as a new ioctl... But for backwards compatability we would need to maintain the huge PCI ID tables in userspace so the benefit is moot. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
