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

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Message-ID: <CAHp75VfoZTr5L3z5_SXW58W2Ate5nCWSzP8hAA051fVwizSjag@mail.gmail.com>
Date:   Thu, 2 Mar 2017 14:50:00 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Tejun Heo <tj@...nel.org>
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

On Thu, Mar 2, 2017 at 2:05 PM, Lorenzo Pieralisi
<lorenzo.pieralisi@....com> wrote:
> 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:

+Cc: Tejun, who is initial author of PCI managed resources implementation.

> 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.

I would vote for pcim_*() variant.

>> 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.

Oh, sorry, there are two examples currently, i.e.
pci_enable_msi()/pci_enable_msix() and pci_request_region*() which has
no "m" in the name, but are managed on release by pcim_release().
Some developers consider this as a bad idea, but so far no patch has
been sent to introduce pcim_*() variants of those.

So, regarding to your stuff, I would stick with "pcim" prefix.

-- 
With Best Regards,
Andy Shevchenko