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Date: Tue, 25 Aug 2020 14:39:55 +0800 From: Kai Heng Feng <kai.heng.feng@...onical.com> To: Christoph Hellwig <hch@...radead.org> Cc: Bjorn Helgaas <bhelgaas@...gle.com>, jonathan.derrick@...el.com, Mario.Limonciello@...l.com, Heiner Kallweit <hkallweit1@...il.com>, Mika Westerberg <mika.westerberg@...ux.intel.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Xiongfeng Wang <wangxiongfeng2@...wei.com>, Krzysztof Wilczynski <kw@...ux.com>, "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, Dan Williams <dan.j.williams@...el.com>, "Huffman, Amber" <amber.huffman@...el.com> Subject: Re: [PATCH] PCI/ASPM: Enable ASPM for links under VMD domain Hi Christoph, > On Aug 25, 2020, at 2:23 PM, Christoph Hellwig <hch@...radead.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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