linux-kernel - Re: [PATCH v9 0/3] Tango PCIe controller support

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Message-ID: <20170706033946.GO13824@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 5 Jul 2017 22:39:46 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Mason <slash.tmp@...e.fr>
Cc:     Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        DT <devicetree@...r.kernel.org>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>
Subject: Re: [PATCH v9 0/3] Tango PCIe controller support

On Wed, Jul 05, 2017 at 11:59:33PM +0200, Mason wrote:
> On 05/07/2017 23:34, Bjorn Helgaas wrote:
> 
> > On Wed, Jul 05, 2017 at 10:39:19PM +0200, Mason wrote:
> >
> >> On 05/07/2017 20:03, Bjorn Helgaas wrote:

> > If you confirm that
> > https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-tango&id=d752a8b29345
> > works for you, I'll include it in my v4.13 pull request.
> 
> There were a few nits I wanted to address:
> 
> - Since we added suppress_bind_attrs = true, probe()
> can only be called at init, so I wanted to mark __init
> all the probe functions, to save space.
> 
> - I left the definition of MSI_MAX in the wrong patch
> 
> - You put a pointer to the pdev in the struct tango_pcie.
> I think this is redundant, since the pdev already has a
> pointer to the struct, as drvdata.
> So I wanted to change tango_msi_probe() to take a pdev
> as argument (to make it more like an actual probe function)
> and derive pcie from pdev, instead of the other way around.

I don't think tango_msi_probe() is really a "probe" function.  It's
all part of the tango driver, and it's not claiming a separate piece
of hardware.  So I would keep the name and structure similar to these:

  advk_pcie_init_msi_irq_domain()
  nwl_pcie_init_msi_irq_domain()

BTW, those functions use irq_domain_add_linear(), while you are one of
the very few callers of irq_domain_create_linear().  Why the difference?
If your code does basically the same thing, it's very helpful to me if
it *looks* basically the same.

> Can I send you a patch series with these changes on Friday?

I was planning to ask Linus to pull my branch tomorrow or Friday
because I'm going on vacation next week and I don't want to leave
right after he pulls it.  So the sooner the better.

Bjorn