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From: "hch@infradead.org" <hch@infradead.org>
To: "Limonciello, Mario" <Mario.Limonciello@dell.com>
Cc: "hch@infradead.org" <hch@infradead.org>,
	"Derrick, Jonathan" <jonathan.derrick@intel.com>,
	"wangxiongfeng2@huawei.com" <wangxiongfeng2@huawei.com>,
	"kw@linux.com" <kw@linux.com>,
	"hkallweit1@gmail.com" <hkallweit1@gmail.com>,
	"kai.heng.feng@canonical.com" <kai.heng.feng@canonical.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"mika.westerberg@linux.intel.com"
	<mika.westerberg@linux.intel.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"Williams, Dan J" <dan.j.williams@intel.com>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"Huffman, Amber" <amber.huffman@intel.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@intel.com>
Subject: Re: [PATCH] PCI/ASPM: Enable ASPM for links under VMD domain
Date: Sat, 29 Aug 2020 08:24:05 +0100	[thread overview]
Message-ID: <20200829072405.GB6704@infradead.org> (raw)
In-Reply-To: <DM6PR19MB2636ACECA16E43638B502A6DFA550@DM6PR19MB2636.namprd19.prod.outlook.com>

On Thu, Aug 27, 2020 at 05:49:40PM +0000, Limonciello, Mario wrote:
> Can you further elaborate what exactly you're wanting here?  VMD enable/disable
> is something that is configured in firmware setup as the firmware does the early
> configuration for the silicon related to it.  So it's up to the OEM whether to
> offer the knob to an end user.
> 
> At least for Dell this setting also does export to sysfs and can be turned on/off
> around a reboot cycle via this: https://patchwork.kernel.org/patch/11693231/.
> 
> As was mentioned earlier in this thread VMD is likely to be defaulting to "on"
> for many machines with the upcoming silicon.  Making it work well on Linux is
> preferable to again having to change firmware settings between operating systems
> like the NVME remapping thing from earlier silicon required.

And the right answer is to turn it off, but we really need to do that
at runtime, and not over a reboot cycle..

  reply	other threads:[~2020-08-29  7:24 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-21 12:32 [PATCH] PCI/ASPM: Enable ASPM for links under VMD domain Kai-Heng Feng
2020-08-24 13:04 ` Mika Westerberg
2020-08-25  6:23 ` Christoph Hellwig
2020-08-25  6:39   ` Kai Heng Feng
2020-08-25  6:56     ` Christoph Hellwig
2020-08-26  5:53       ` Kai-Heng Feng
2020-09-02 19:48       ` David Fugate
2020-09-02 22:54         ` Keith Busch
2020-08-26 21:43   ` Derrick, Jonathan
2020-08-27  6:34     ` hch
2020-08-27 16:13       ` Derrick, Jonathan
2020-08-27 16:23         ` hch
2020-08-27 16:45           ` Derrick, Jonathan
2020-08-27 16:50             ` hch
2020-08-27 21:33             ` Dan Williams
2020-08-29  7:23               ` hch
2020-08-27 17:49           ` Limonciello, Mario
2020-08-29  7:24             ` hch [this message]
2020-09-10  1:55 ` Bjorn Helgaas
2020-09-10 16:33   ` Derrick, Jonathan
2020-09-10 17:38     ` Bjorn Helgaas
     [not found] <0f902d555deb423ef1c79835b23c917be2633162.camel@intel.com>
2020-09-10 19:17 ` Bjorn Helgaas
2020-09-10 19:51   ` Derrick, Jonathan
2020-09-17 17:20     ` Bjorn Helgaas
2020-09-23 14:29       ` Kai-Heng Feng

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