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Message-ID: <20240613233605.GG19897@nvidia.com>
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
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