linux-kernel - RE: [PATCH 2/6 v2] iommu: of: make of_pci_map

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Date:   Wed, 18 Apr 2018 06:21:46 +0000
From:   Nipun Gupta <nipun.gupta@....com>
To:     Robin Murphy <robin.murphy@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "frowand.list@...il.com" <frowand.list@...il.com>
CC:     "will.deacon@....com" <will.deacon@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "hch@....de" <hch@....de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bharat Bhushan <bharat.bhushan@....com>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Leo Li <leoyang.li@....com>
Subject: RE: [PATCH 2/6 v2] iommu: of: make of_pci_map_rid() available for
 other devices too



> -----Original Message-----
> From: Robin Murphy [mailto:robin.murphy@....com]
> Sent: Tuesday, April 17, 2018 10:23 PM
> To: Nipun Gupta <nipun.gupta@....com>; robh+dt@...nel.org;
> frowand.list@...il.com
> Cc: will.deacon@....com; mark.rutland@....com; catalin.marinas@....com;
> hch@....de; gregkh@...uxfoundation.org; joro@...tes.org;
> m.szyprowski@...sung.com; shawnguo@...nel.org; bhelgaas@...gle.com;
> iommu@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linuxppc-
> dev@...ts.ozlabs.org; linux-pci@...r.kernel.org; Bharat Bhushan
> <bharat.bhushan@....com>; stuyoder@...il.com; Laurentiu Tudor
> <laurentiu.tudor@....com>; Leo Li <leoyang.li@....com>
> Subject: Re: [PATCH 2/6 v2] iommu: of: make of_pci_map_rid() available for
> other devices too
> 
> On 17/04/18 11:21, Nipun Gupta wrote:
> > iommu-map property is also used by devices with fsl-mc. This patch
> > moves the of_pci_map_rid to generic location, so that it can be used
> > by other busses too.
> >
> > Signed-off-by: Nipun Gupta <nipun.gupta@....com>
> > ---
> >   drivers/iommu/of_iommu.c | 106
> > +++++++++++++++++++++++++++++++++++++++++++++--
> 
> Doesn't this break "msi-parent" parsing for !CONFIG_OF_IOMMU? I guess you
> don't want fsl-mc to have to depend on PCI, but this looks like a step in the
> wrong direction.

Thanks for pointing out.
Agree, this will break "msi-parent" parsing for !CONFIG_OF_IOMMU case.

> 
> I'm not entirely sure where of_map_rid() fits best, but from a quick look around
> the least-worst option might be drivers/of/of_address.c, unless Rob and Frank
> have a better idea of where generic DT-based ID translation routines could live?
> 
> >   drivers/of/irq.c         |   6 +--
> >   drivers/pci/of.c         | 101 --------------------------------------------
> >   include/linux/of_iommu.h |  11 +++++
> >   include/linux/of_pci.h   |  10 -----
> >   5 files changed, 117 insertions(+), 117 deletions(-)
> >

[...]

> >   struct of_pci_iommu_alias_info {
> >   	struct device *dev;
> >   	struct device_node *np;
> > @@ -149,9 +249,9 @@ static int of_pci_iommu_init(struct pci_dev *pdev, u16
> alias, void *data)
> >   	struct of_phandle_args iommu_spec = { .args_count = 1 };
> >   	int err;
> >
> > -	err = of_pci_map_rid(info->np, alias, "iommu-map",
> > -			     "iommu-map-mask", &iommu_spec.np,
> > -			     iommu_spec.args);
> > +	err = of_map_rid(info->np, alias, "iommu-map",
> > +			 "iommu-map-mask", &iommu_spec.np,
> > +			 iommu_spec.args);
> 
> Super-nit: Apparently I missed rewrapping this to 2 lines in d87beb749281, but if
> it's being touched again, that would be nice ;)

Sure.. I'll take care of this in the next version :)

Regards,
Nipun