linux-kernel - Re: [RFC 1/2] arm64: PCI: Allow use arch-specific pci sysdata

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK8P3a2qATr7qAkPqkZW4aifb3rq6CPrrsEX=8XcjTk0j5aW0A@mail.gmail.com>
Date:   Sat, 20 Mar 2021 15:24:06 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>, Clint Sbisa <csbisa@...zon.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>
Subject: Re: [RFC 1/2] arm64: PCI: Allow use arch-specific pci sysdata

On Sat, Mar 20, 2021 at 2:23 PM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sat, 20 Mar 2021 13:03:13 +0000,
> Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Sat, Mar 20, 2021 at 1:54 PM Marc Zyngier <maz@...nel.org> wrote:
> > > On Fri, 19 Mar 2021 21:12:46 +0000,
> > >
> > > Having an optional callback to host bridges to obtain the MSI domain
> > > may be possible in some cases though (there might be a chicken/egg
> > > problem for some drivers though...).
> >
> > I would expect that the host bridge driver can find the MSI domain
> > at probe time and just add a pointer into the pci_host_bridge
> > structure.
>
> In most cases, it doesn't implement it itself, and I'd be reluctant to
> duplicate information that can already be retrieved from somewhere
> else in a generic way (i.e. no PCI specific).

At the moment, the information is retried through a maze of different
functions, and already duplicated in both the pci_host_bridge and the
pci_bus structures.  If we can change everything to use
CONFIG_GENERIC_MSI_IRQ_DOMAIN, then most of that code
can probably just go away, leaving only the part in the phb.

       Arnd