Re: Resizable PCI BAR support V9

[Christian KÃnig]

Am 24.10.2017 um 21:44 schrieb Bjorn Helgaas:
> On Wed, Oct 18, 2017 at 03:58:16PM +0200, Christian KÃnig wrote:
> > Hi everyone,
> >
> > This is the ninth and hopefully last incarnation of this set of patches. It
> > enables device drivers to resize and most likely also relocate the PCI BAR of
> > devices they manage to allow the CPU to access all of the device local memory
> > at once.
> >
> > This is very useful for GFX device drivers where the default PCI BAR is only
> > about 256MB in size for compatibility reasons, but the device easily have
> > multiple gigabyte of local memory.
> >
> > Some changes since the last version:
> > 1. Rebased on drm-next, so should be ready to be merged for 4.15.
> > 2. The fixup of the 64bit root window on AMD Family 15h CPUs/APUs is only
> >     enabled when we compile a kernel supporting that hw.
> > 3. Some minor error handling improvements for the amdgpu side. We now
> >     gracefully abort driver loading in case of a critical error instead of
> >     calling BUG().
> >
> > Bjorn any more comments or can we finally get this into 4.15? I will remove the
> > version tags from the patches when I send you a pull request if you want this.
> >
> > I only work on this as a background task, so sorry for the ~3 month delay
> > between each version of the patchset.
> I put these (except for the last) on pci/resource for v4.15.  I'd be
> happy to merge the last as well if you like.  My tree does not include
> drm-next, so there would be a minor conflict when merging upstream.

Thanks Bjorn, that is great to hear.

I will sync up with Alex and Dave how to merge the last patch.

Christian.

> Bjorn