linux-kernel - Re: [RFC PATCH] PCI: Remove End-End TLP as PASID dependency

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Message-ID: <a849234d-453a-8faa-93dd-12ea1b0165ab@kernel.org>
Date:   Thu, 11 Jun 2020 10:11:30 -0400
From:   Sinan Kaya <okaya@...nel.org>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, kenneth-lee-2012@...mail.com,
        Wangzhou <wangzhou1@...ilicon.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] PCI: Remove End-End TLP as PASID dependency

On 6/10/2020 4:00 AM, Zhangfei Gao wrote:
>> Why not set the eetlp_prefix_path bit from a PCI quirk?  Unlike the stall
>> problem from the other thread, this one looks like a simple design
>> mistake
>> that can be fixed easily in future iterations of the platform: just set
>> the "End-End TLP Prefix Supported" bit in the Device Capability 2
>> Register
>> of all bridges.
> Yes, we can still set eetlp_prefix_path bit from a PCI quirk.

I agree. Vendor specific quirk should be the way to go here if it is not
compliant with the spec.