linux-kernel - Re: [PATCH v7 3/4] PCI: Introduce disable_acs

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Message-ID: <20180717114847.5c407c59@t450s.home>
Date:   Tue, 17 Jul 2018 11:48:47 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-doc@...r.kernel.org, Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christian König <christian.koenig@....com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v7 3/4] PCI: Introduce disable_acs_redir quirk

On Tue, 17 Jul 2018 11:02:03 -0600
Logan Gunthorpe <logang@...tatee.com> wrote:

> Intel SPT PCH hardware has an implementation of the ACS bits that
> does not comply with the PCI express standard. To deal with this
> the existing code has an enable_acs() quirk for the hardware.
> 
> In order to be able to correctly disable the ACS redirect bits for
> all hardware we need an analagous quirk to disable those bits.
> 
> This adds the function pci_dev_specific_disable_acs_redir() which
> behaves similarly to pci_dev_specific_enable_acs() but uses a new
> function pointer for quirks which disables the ACS redirect bits.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  drivers/pci/quirks.c | 78 ++++++++++++++++++++++++++++++++++++++++++++--------
>  include/linux/pci.h  |  5 ++++
>  2 files changed, 71 insertions(+), 12 deletions(-)

Reviewed-by: Alex Williamson <alex.williamson@...hat.com>