linux-kernel - Re: [PATCH 07/20] PCI: implement Devres interface to map PCI config space

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Date:   Thu, 2 Mar 2017 12:05:46 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        Pratyush Anand <pratyush.anand@...il.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Mingkai Hu <mingkai.hu@...escale.com>,
        John Garry <john.garry@...wei.com>,
        Tanmay Inamdar <tinamdar@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
        Ray Jui <rjui@...adcom.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Minghuan Lian <minghuan.Lian@...escale.com>,
        Jon Mason <jonmason@...adcom.com>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Roy Zang <tie-fei.zang@...escale.com>
Subject: Re: [PATCH 07/20] PCI: implement Devres interface to map PCI config
 space

Hi Andy,

On Thu, Mar 02, 2017 at 01:54:42AM +0200, Andy Shevchenko wrote:
> On Mon, Feb 27, 2017 at 5:14 PM, Lorenzo Pieralisi
> <lorenzo.pieralisi@....com> wrote:
> > The introduction of the pci_remap_cfgspace() interface allows
> > PCI host controller drivers to map PCI config space through a
> > dedicated kernel interface. Current PCI host controller drivers
> > use the devm_ioremap_* Devres interfaces to map PCI configuration
> > space regions so in order to update them to the new
> > pci_remap_cfgspace() mapping interface a new set of Devres interfaces
> > should be implemented so that PCI host controller drivers can make
> > use of them.
> >
> > Introduce two new functions in the PCI kernel layer and Devres
> > documentation:
> >
> > - devm_pci_remap_cfgspace()
> > - devm_pci_remap_cfg_resource()
> >
> > so that PCI host controller drivers can make use of them to map
> > PCI configuration space regions.
> 
> Wouldn't you like to be consistent with current PCI API, i.e.:
> 1. devm_*() functions called pcim_*() in PCI.

I thought about that and did not do it because here we are remapping
resources that are _not_ PCI bus resources (ie it is not PCI BARs we
are remapping), keeping the devm_* prefix would be more consistent
to the typical device drivers remapping functions pattern (ie a
typical PCI host controller driver would mix devm_ and pcim_ calls
which is a bit hard to parse), that was my rationale.

I am not too fussed about that either way, I am happy to update it to
pcim_* though, it is Bjorn/Arnd's decision.

> 2. If you may notice there is no separate pcim_*map*() stuff, they are
> dynamically adapting to the case.

I do not understand what you mean here I would ask you to elaborate
a bit more please so that I can do something about it.

Thanks !
Lorenzo