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SubjectRe: [PATCH] PCI/ASPM: Enable ASPM for links under VMD domain
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Hi Christoph,

> On Aug 25, 2020, at 2:23 PM, Christoph Hellwig <hch@infradead.org> wrote:
>
> On Fri, Aug 21, 2020 at 08:32:20PM +0800, Kai-Heng Feng wrote:
>> New Intel laptops with VMD cannot reach deeper power saving state,
>> renders very short battery time.
>
> So what about just disabling VMD given how bloody pointless it is?
> Hasn't anyone learned from the AHCI remapping debacle?
>
> I'm really pissed at all this pointless crap intel comes up with just
> to make life hard for absolutely no gain. Is it so hard to just leave
> a NVMe device as a standard NVMe device instead of f*^&ing everything
> up in the chipset to make OS support a pain and I/O slower than by
> doing nothing?

From what I can see from the hardwares at my hand, VMD only enables a PCI domain and PCI bridges behind it.

NVMe works as a regular NVMe under those bridges. No magic remapping happens here.

Kai-Heng

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