linux-kernel - Re: [PATCH 6/7] MIPS: SGI-IP27: use generic PCI driver

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Date:   Wed, 30 Jan 2019 18:25:20 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        James Hogan <jhogan@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 6/7] MIPS: SGI-IP27: use generic PCI driver

On Wed, 30 Jan 2019 01:17:06 -0800
Christoph Hellwig <hch@...radead.org> wrote:

> On Tue, Jan 29, 2019 at 04:24:45PM +0100, Thomas Bogendoerfer wrote:
> > > From an abstraction point of view this doesn't really belong into
> > > a bridge driver as it is a global exported function.  I guess we can
> > > keep it here with a fixme comment, but we should probably move this
> > > into a method call instead.
> > 
> > or put the nodeid into the bus struct ?
> 
> Doesn't sound to bad to me, you'll just have to update a fair
> amount of arch implementations.

and it's already there:-) Each struct device has a field numa_node and pci_bus has
contains a struct device. arm64 is already using it only not so nice part is the
usage of pcibios_root_bridge_prepare() to set the numa_node for the root bus.

> > I'm all for it. I looked at the examples for using dma_pfn_offset and the
> > only one coming close to usefull for me is arch/sh/drivers/pci/pcie-sh7786.c
> > It overloads pcibios_bus_add_device() to set dma_pfn_offset, which doesn't
> > look much nicer. What about having a dma_pfn_offset in struct pci_bus
> > which all device inherit from ?
> 
> Or add a add_dev callback, similar to what I did for a previous series
> that we didn't end up needing after all:
> 
> http://git.infradead.org/users/hch/misc.git/commitdiff/06d9b4fc7deed336edc1292fe2e661729e98ec39

that's exactly what I'm looking for. Should I add the patch for my patchset or
are you going to submit it after having a use case ?

Thomas.

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