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SubjectRe: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already assigned


H. Peter Anvin wrote:
> On 05/28/2010 10:10 AM, Mike Travis wrote:
>>
>> H. Peter Anvin wrote:
>>> On 05/28/2010 09:53 AM, Mike Travis wrote:
>>>> Any further consideration for this patch, or has it been rejected?
>>> Well, it's really up to Jesse, but as far as I can see, this patch is a
>>> net loss of functionality and doesn't actually add anything. Without
>>> this patch, some resources that were not assigned by BIOS will be
>>> unreachable. With this patch, *all* resources that were not assigned by
>>> BIOS will be unreachable...
>>>
>>> -hpa
>>>
>> Apparently you're missing the point of the patch? The patch is needed
>> because BIOS is purposely not assigning I/O BAR's to devices that won't
>> use them, freeing up the resource for devices that do need them. Where
>> is the "all" resources that are not reachable?
>>
>
> No, the patch isn't needed for those.
>
> Without your patch:
>
> - Devices assigned by BIOS remain assigned;
> - Devices not assigned by BIOS get assigned until address space
> exhausted.
>
> With your patch:
>
> - Devices assigned by BIOS remain assigned;
> - Devices not assigned by BIOS never get assigned at all.
>
> What am I missing here?
>
> -hpa
>

BIOS still assigns the MMIO BAR's so the devices are alive.


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