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"stuyoder@gmail.com" , Laurentiu Tudor Subject: RE: [PATCH 1/6] Docs: dt: add fsl-mc iommu-parent device-tree binding Date: Mon, 5 Mar 2018 15:54:34 +0000 Message-ID: References: <1520260166-29387-1-git-send-email-nipun.gupta@nxp.com> <1520260166-29387-2-git-send-email-nipun.gupta@nxp.com> <5cdeded1-ca3c-339a-bf73-73401e7dd4ed@arm.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , DQoNCj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogUm9iaW4gTXVycGh5IFtt YWlsdG86cm9iaW4ubXVycGh5QGFybS5jb21dDQo+IFNlbnQ6IE1vbmRheSwgTWFyY2ggMDUsIDIw MTggMjE6MDcNCj4gVG86IE5pcHVuIEd1cHRhIDxuaXB1bi5ndXB0YUBueHAuY29tPjsgd2lsbC5k ZWFjb25AYXJtLmNvbTsNCj4gbWFyay5ydXRsYW5kQGFybS5jb207IGNhdGFsaW4ubWFyaW5hc0Bh cm0uY29tDQo+IENjOiBpb21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZzsgcm9iaCtkdEBr ZXJuZWwub3JnOyBoY2hAbHN0LmRlOw0KPiBtLnN6eXByb3dza2lAc2Ftc3VuZy5jb207IGdyZWdr 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bHJlYWR5IGV4aXN0cywgdGhhbiB0byBpbnRyb2R1Y2UgYSBuZXcgb25lIHRvIG1lcmVseSBhc3N1 bWUgb25lDQo+IGhhcmQtY29kZWQgdmFsdWUgb2YgdGhlIGV4aXN0aW5nIG9uZS4gRXh0ZW5kaW5n IG1zaS1wYXJlbnQgdG8gbXNpLW1hcA0KPiB3YXMgYSBjYXNlIG9mICJvb3BzLCBpdCB0dXJucyBv dXQgd2UgbmVlZCBtb3JlIGZsZXhpYmlsaXR5IGhlcmUiOyBmb3INCj4gdGhlIGNhc2Ugb2YgaW9t bXUtbWFwIEkgY2FuJ3QgaW1hZ2luZSBhbnkganVzdGlmaWNhdGlvbiBmb3Igc2F5aW5nDQo+ICJv b3BzLCB3ZSBuZWVkIGxlc3MgZmxleGliaWxpdHkgaGVyZSIgKHNhdmluZyA5IHdob2xlIGJ5dGVz IGluIHRoZSBEVA0KPiByZWFsbHkgaXMgaXJyZWxldmFudCkuDQo+IA0KPiBSb2Jpbi4NCg== From mboxrd@z Thu Jan 1 00:00:00 1970 From: nipun.gupta@nxp.com (Nipun Gupta) Date: Mon, 5 Mar 2018 15:54:34 +0000 Subject: [PATCH 1/6] Docs: dt: add fsl-mc iommu-parent device-tree binding In-Reply-To: References: <1520260166-29387-1-git-send-email-nipun.gupta@nxp.com> <1520260166-29387-2-git-send-email-nipun.gupta@nxp.com> <5cdeded1-ca3c-339a-bf73-73401e7dd4ed@arm.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org > -----Original Message----- > From: Robin Murphy [mailto:robin.murphy at arm.com] > Sent: Monday, March 05, 2018 21:07 > To: Nipun Gupta ; will.deacon at arm.com; > mark.rutland at arm.com; catalin.marinas at arm.com > Cc: iommu at lists.linux-foundation.org; robh+dt at kernel.org; hch at lst.de; > m.szyprowski at samsung.com; gregkh at linuxfoundation.org; joro at 8bytes.org; > Leo Li ; shawnguo at kernel.org; linux- > kernel at vger.kernel.org; devicetree at vger.kernel.org; linux-arm- > kernel at lists.infradead.org; linuxppc-dev at lists.ozlabs.org; Bharat Bhushan > ; stuyoder at gmail.com; Laurentiu Tudor > > Subject: Re: [PATCH 1/6] Docs: dt: add fsl-mc iommu-parent device-tree binding > > On 05/03/18 15:00, Nipun Gupta wrote: > > > > > >> -----Original Message----- > >> From: Robin Murphy [mailto:robin.murphy at arm.com] > >> Sent: Monday, March 05, 2018 20:23 > >> To: Nipun Gupta ; will.deacon at arm.com; > >> mark.rutland at arm.com; catalin.marinas at arm.com > >> Cc: iommu at lists.linux-foundation.org; robh+dt at kernel.org; hch at lst.de; > >> m.szyprowski at samsung.com; gregkh at linuxfoundation.org; > joro at 8bytes.org; > >> Leo Li ; shawnguo at kernel.org; linux- > >> kernel at vger.kernel.org; devicetree at vger.kernel.org; linux-arm- > >> kernel at lists.infradead.org; linuxppc-dev at lists.ozlabs.org; Bharat Bhushan > >> ; stuyoder at gmail.com; Laurentiu Tudor > >> > >> Subject: Re: [PATCH 1/6] Docs: dt: add fsl-mc iommu-parent device-tree > binding > >> > >> On 05/03/18 14:29, Nipun Gupta wrote: > >>> The existing IOMMU bindings cannot be used to specify the relationship > >>> between fsl-mc devices and IOMMUs. This patch adds a binding for > >>> mapping fsl-mc devices to IOMMUs, using a new iommu-parent property. > >> > >> Given that allowing "msi-parent" for #msi-cells > 1 is merely a > >> backward-compatibility bodge full of hard-coded assumptions, why would > >> we want to knowingly introduce a similarly unpleasant equivalent for > >> IOMMUs? What's wrong with "iommu-map"? > > > > Hi Robin, > > > > With 'msi-parent' the property is fixed up to have msi-map. In this case there is > > no fixup required and simple 'iommu-parent' property can be used, with MC > bus > > itself providing the stream-id's (in the code execution via FW). > > > > We can also use the iommu-map property similar to PCI, which will require u- > boot > > fixup. But then it leads to little bit complications of u-boot - kernel > compatibility. > > What needs fixing up? With a stream-map-mask in place to ignore the > upper Stream ID bits, you just need: > > iommu-map = <0 &smmu 0 0x80>; > > to say that the lower bits of the ICID value map directly to the lower > bits of the Stream ID value - that's the same fixed property of the > hardware that you're wanting to assume in iommu-parent. Makes sense. I was going in a little bit wrong direction. Thanks for correcting. I will send v2 patchset with iommu-map property. Regards, Nipun > > > If you suggest we can re-use the iommu-map property. What is your opinion? > > I think it makes a lot more sense to directly use the property which > already exists, than to introduce a new one to merely assume one > hard-coded value of the existing one. Extending msi-parent to msi-map > was a case of "oops, it turns out we need more flexibility here"; for > the case of iommu-map I can't imagine any justification for saying > "oops, we need less flexibility here" (saving 9 whole bytes in the DT > really is irrelevant). > > Robin.