Resizable PCI BAR support V9

Christian König ckoenig.leichtzumerken at
Wed Oct 25 11:27:48 UTC 2017

Am 24.10.2017 um 21:44 schrieb Bjorn Helgaas:
> On Wed, Oct 18, 2017 at 03:58:16PM +0200, Christian König 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.


> Bjorn

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