linux-kernel - Re: [PATCH V3] PCI: Extend ACS configurability

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Date: Thu, 13 Jun 2024 20:36:05 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Vidya Sagar <vidyas@...dia.com>, "corbet@....net" <corbet@....net>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	Gal Shalom <galshalom@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Thierry Reding <treding@...dia.com>,
	Jon Hunter <jonathanh@...dia.com>,
	Masoud Moshref Javadi <mmoshrefjava@...dia.com>,
	Shahaf Shuler <shahafs@...dia.com>,
	Vikram Sethi <vsethi@...dia.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Jiandi An <jan@...dia.com>, Tushar Dave <tdave@...dia.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Krishna Thota <kthota@...dia.com>,
	Manikanta Maddireddy <mmaddireddy@...dia.com>,
	"sagar.tv@...il.com" <sagar.tv@...il.com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH V3] PCI: Extend ACS configurability

On Thu, Jun 13, 2024 at 05:05:20PM -0500, Bjorn Helgaas wrote:

> It's unfortunate that this requires so much expert knowledge to use,
> but I guess we don't really have a good alternative.  The only way I
> can think of to help would be some kind of white paper or examples in
> Documentation/PCI/.

So far I am seeing the system supplier supply the appropriate
instructions.. It is already this way for set_pci, and yes, it is a
huge PITA.

At one point Steven Bates was talking about some ACPI tables to give
the OS more information but I don't think that went anywhere..

Jason