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charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1729ae21-d08c-b413-51a3-f22c394b388d@arm.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Robin Murphy , Christoph Hellwig Cc: "will.deacon@arm.com" , "mark.rutland@arm.com" , "catalin.marinas@arm.com" , "iommu@lists.linux-foundation.org" , "robh+dt@kernel.org" , "m.szyprowski@samsung.com" , "gregkh@linuxfoundation.org" , "joro@8bytes.org" , Leo Li , "shawnguo@kernel.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , Bharat Bhushan List-Id: devicetree@vger.kernel.org DQoNCj4gRnJvbTogUm9iaW4gTXVycGh5IFttYWlsdG86cm9iaW4ubXVycGh5QGFybS5jb21dDQo+ IFNlbnQ6IFR1ZXNkYXksIE1hcmNoIDA2LCAyMDE4IDA6MjINCj4gDQo+IE9uIDA1LzAzLzE4IDE4 OjM5LCBDaHJpc3RvcGggSGVsbHdpZyB3cm90ZToNCj4gPiBPbiBNb24sIE1hciAwNSwgMjAxOCBh dCAwMzo0ODozMlBNICswMDAwLCBSb2JpbiBNdXJwaHkgd3JvdGU6DQo+ID4+IFVuZm9ydHVuYXRl bHkgZm9yIHVzLCBmc2wtbWMgaXMgY29uY2VwdHVhbGx5IHJhdGhlciBsaWtlIFBDSSBpbiB0aGF0 IGl0J3MNCj4gPj4gc29mdHdhcmUtZGlzY292ZXJhYmxlIGFuZCB0aGUgb25seSB0aGluZyBkZXNj cmliZWQgaW4gRFQgaXMgdGhlIGJ1cyAiaG9zdCIsDQo+ID4+IHRodXMgd2UgbmVlZCB0aGUgc2Ft ZSBzb3J0IG9mIHRoaW5nIGFzIGZvciBQQ0kgdG8gbWFwIGZyb20gdGhlIGNoaWxkDQo+ID4+IGRl dmljZXMgYmFjayB0byB0aGUgYnVzIHJvb3QgaW4gb3JkZXIgdG8gZmluZCB0aGUgYXBwcm9wcmlh dGUgZmlybXdhcmUNCj4gPj4gbm9kZS4gV29yc2UgdGhhbiBQQ0ksIHRob3VnaCwgd2Ugd291bGRu J3QgZXZlbiBoYXZlIHRoZSBvcHRpb24gb2YNCj4gPj4gZGVzY3JpYmluZyBjaGlsZCBkZXZpY2Vz IHN0YXRpY2FsbHkgaW4gZmlybXdhcmUgYXQgYWxsLCBzaW5jZSBpdCdzIGFjdHVhbGx5DQo+ID4+ IG9uZSBvZiB0aGVzZSBydW50aW1lLWNvbmZpZ3VyYWJsZSAiYnVpbGQgeW91ciBvd24gbmV0d29y ayBhY2NlbGVyYXRvciINCj4gPj4gaGFyZHdhcmUgcG9vbHMgd2hlcmUgdXNlcnNwYWNlIGdldHMg dG8gY3JlYXRlIGFuZCBkZXN0cm95ICJkZXZpY2VzIiBhcyBpdA0KPiA+PiBsaWtlcy4NCj4gPg0K PiA+IEkgcmVhbGx5IGhhdGUgdGhlIFBDSSBzcGVjaWFsIGNhc2UganVzdCBhcyBtdWNoLiAgTWF5 YmUgd2UganVzdA0KPiA+IG5lZWQgYSBkbWFfY29uZmlndXJlIG1ldGhvZCBvbiB0aGUgYnVzLCBh bmQgbW92ZSBQQ0kgYXMgd2VsbCBhcyBmc2wtbWMNCj4gPiB0byBpdC4NCj4gDQo+IEhtbSwgb24g cmVmbGVjdGlvbiwgMTAwJSBhY2sgdG8gdGhhdCBpZGVhLiBJdCB3b3VsZCBuZWF0bHkgc3VwZXJz ZWRlDQo+IGJ1cy0+Zm9yY2VfZG1hICphbmQqIG1lYW4gdGhhdCB3ZSBkb24ndCBoYXZlIHRvIGVm ZmVjdGl2ZWx5IHB1bGwgcGNpLmgNCj4gaW50byBldmVyeXRoaW5nLCB3aGljaCBJJ3ZlIG5ldmVy IGxpa2VkLiBJbiBoaW5kc2lnaHQgZG1hX2NvbmZpZ3VyZSgpDQo+IGRvZXMgZmVlbCBsaWtlIGl0 J3MgZ3Jvd24gaW50byB0aGlzIG9kZCBjaG9rZSBwb2ludCB3aGVyZSB3ZSBtdW5nZQ0KPiBldmVy eXRoaW5nIGluIGp1c3QgZm9yIGl0IHRvIGF3a3dhcmRseSB1bnBpY2sgdGhpbmdzIGFnYWluLg0K PiANCj4gUm9iaW4uDQoNCisxIHRvIHRoZSBpZGVhLg0KDQpTb3JyeSBmb3IgYXNraW5nIGEgdHJp dmlhbCBxdWVzdGlvbiAtIGxvb2tpbmcgaW50byBkbWFfY29uZmlndXJlKCkgSSBzZWUgdGhhdA0K UENJIGlzIHVzZWQgaW4gdGhlIHN0YXJ0IGFuZCB0aGUgZW5kIG9mIHRoZSBBUEkuDQpJbiB0aGUg ZW5kIHBhcnQgcGNpX3B1dF9ob3N0X2JyaWRnZV9kZXZpY2UoKSBpcyBjYWxsZWQuDQpTbyBhcmUg dHdvIGJ1cyBjYWxsYmFja3Mgc29tZXRoaW5nIGxpa2UgJ2RtYV9jb25maWdfc3RhcnQnICYgJ2Rt YV9jb25maWdfZW5kJw0Kd2lsbCBiZSByZXF1aXJlZCB3aGVyZSB0aGUgZm9ybWVyIG9uZSB3aWxs IHJldHVybiAiZG1hX2RldiI/DQoNClJlZ2FyZHMsDQpOaXB1bg0K From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from EUR01-VE1-obe.outbound.protection.outlook.com (mail-ve1eur01on0082.outbound.protection.outlook.com [104.47.1.82]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zwPJK2RDFzF1Jl for ; Tue, 6 Mar 2018 15:42:07 +1100 (AEDT) From: Nipun Gupta To: Robin Murphy , Christoph Hellwig CC: "will.deacon@arm.com" , "mark.rutland@arm.com" , "catalin.marinas@arm.com" , "iommu@lists.linux-foundation.org" , "robh+dt@kernel.org" , "m.szyprowski@samsung.com" , "gregkh@linuxfoundation.org" , "joro@8bytes.org" , Leo Li , "shawnguo@kernel.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , Bharat Bhushan , "stuyoder@gmail.com" , Laurentiu Tudor Subject: RE: [PATCH 5/6] dma-mapping: support fsl-mc bus Date: Tue, 6 Mar 2018 04:41:56 +0000 Message-ID: References: <1520260166-29387-1-git-send-email-nipun.gupta@nxp.com> <1520260166-29387-6-git-send-email-nipun.gupta@nxp.com> <20180305150814.GA15918@lst.de> <7b4f9972-6aaa-fc9d-3854-d48b19a8051c@arm.com> <20180305183938.GB20086@lst.de> <1729ae21-d08c-b413-51a3-f22c394b388d@arm.com> In-Reply-To: <1729ae21-d08c-b413-51a3-f22c394b388d@arm.com> 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: , DQoNCj4gRnJvbTogUm9iaW4gTXVycGh5IFttYWlsdG86cm9iaW4ubXVycGh5QGFybS5jb21dDQo+ IFNlbnQ6IFR1ZXNkYXksIE1hcmNoIDA2LCAyMDE4IDA6MjINCj4gDQo+IE9uIDA1LzAzLzE4IDE4 OjM5LCBDaHJpc3RvcGggSGVsbHdpZyB3cm90ZToNCj4gPiBPbiBNb24sIE1hciAwNSwgMjAxOCBh dCAwMzo0ODozMlBNICswMDAwLCBSb2JpbiBNdXJwaHkgd3JvdGU6DQo+ID4+IFVuZm9ydHVuYXRl bHkgZm9yIHVzLCBmc2wtbWMgaXMgY29uY2VwdHVhbGx5IHJhdGhlciBsaWtlIFBDSSBpbiB0aGF0 IGl0J3MNCj4gPj4gc29mdHdhcmUtZGlzY292ZXJhYmxlIGFuZCB0aGUgb25seSB0aGluZyBkZXNj cmliZWQgaW4gRFQgaXMgdGhlIGJ1cyAiaG9zdCIsDQo+ID4+IHRodXMgd2UgbmVlZCB0aGUgc2Ft ZSBzb3J0IG9mIHRoaW5nIGFzIGZvciBQQ0kgdG8gbWFwIGZyb20gdGhlIGNoaWxkDQo+ID4+IGRl dmljZXMgYmFjayB0byB0aGUgYnVzIHJvb3QgaW4gb3JkZXIgdG8gZmluZCB0aGUgYXBwcm9wcmlh dGUgZmlybXdhcmUNCj4gPj4gbm9kZS4gV29yc2UgdGhhbiBQQ0ksIHRob3VnaCwgd2Ugd291bGRu J3QgZXZlbiBoYXZlIHRoZSBvcHRpb24gb2YNCj4gPj4gZGVzY3JpYmluZyBjaGlsZCBkZXZpY2Vz IHN0YXRpY2FsbHkgaW4gZmlybXdhcmUgYXQgYWxsLCBzaW5jZSBpdCdzIGFjdHVhbGx5DQo+ID4+ IG9uZSBvZiB0aGVzZSBydW50aW1lLWNvbmZpZ3VyYWJsZSAiYnVpbGQgeW91ciBvd24gbmV0d29y ayBhY2NlbGVyYXRvciINCj4gPj4gaGFyZHdhcmUgcG9vbHMgd2hlcmUgdXNlcnNwYWNlIGdldHMg dG8gY3JlYXRlIGFuZCBkZXN0cm95ICJkZXZpY2VzIiBhcyBpdA0KPiA+PiBsaWtlcy4NCj4gPg0K PiA+IEkgcmVhbGx5IGhhdGUgdGhlIFBDSSBzcGVjaWFsIGNhc2UganVzdCBhcyBtdWNoLiAgTWF5 YmUgd2UganVzdA0KPiA+IG5lZWQgYSBkbWFfY29uZmlndXJlIG1ldGhvZCBvbiB0aGUgYnVzLCBh bmQgbW92ZSBQQ0kgYXMgd2VsbCBhcyBmc2wtbWMNCj4gPiB0byBpdC4NCj4gDQo+IEhtbSwgb24g cmVmbGVjdGlvbiwgMTAwJSBhY2sgdG8gdGhhdCBpZGVhLiBJdCB3b3VsZCBuZWF0bHkgc3VwZXJz ZWRlDQo+IGJ1cy0+Zm9yY2VfZG1hICphbmQqIG1lYW4gdGhhdCB3ZSBkb24ndCBoYXZlIHRvIGVm ZmVjdGl2ZWx5IHB1bGwgcGNpLmgNCj4gaW50byBldmVyeXRoaW5nLCB3aGljaCBJJ3ZlIG5ldmVy IGxpa2VkLiBJbiBoaW5kc2lnaHQgZG1hX2NvbmZpZ3VyZSgpDQo+IGRvZXMgZmVlbCBsaWtlIGl0 J3MgZ3Jvd24gaW50byB0aGlzIG9kZCBjaG9rZSBwb2ludCB3aGVyZSB3ZSBtdW5nZQ0KPiBldmVy eXRoaW5nIGluIGp1c3QgZm9yIGl0IHRvIGF3a3dhcmRseSB1bnBpY2sgdGhpbmdzIGFnYWluLg0K PiANCj4gUm9iaW4uDQoNCisxIHRvIHRoZSBpZGVhLg0KDQpTb3JyeSBmb3IgYXNraW5nIGEgdHJp dmlhbCBxdWVzdGlvbiAtIGxvb2tpbmcgaW50byBkbWFfY29uZmlndXJlKCkgSSBzZWUgdGhhdA0K UENJIGlzIHVzZWQgaW4gdGhlIHN0YXJ0IGFuZCB0aGUgZW5kIG9mIHRoZSBBUEkuDQpJbiB0aGUg ZW5kIHBhcnQgcGNpX3B1dF9ob3N0X2JyaWRnZV9kZXZpY2UoKSBpcyBjYWxsZWQuDQpTbyBhcmUg dHdvIGJ1cyBjYWxsYmFja3Mgc29tZXRoaW5nIGxpa2UgJ2RtYV9jb25maWdfc3RhcnQnICYgJ2Rt YV9jb25maWdfZW5kJw0Kd2lsbCBiZSByZXF1aXJlZCB3aGVyZSB0aGUgZm9ybWVyIG9uZSB3aWxs IHJldHVybiAiZG1hX2RldiI/DQoNClJlZ2FyZHMsDQpOaXB1bg0K From mboxrd@z Thu Jan 1 00:00:00 1970 From: nipun.gupta@nxp.com (Nipun Gupta) Date: Tue, 6 Mar 2018 04:41:56 +0000 Subject: [PATCH 5/6] dma-mapping: support fsl-mc bus In-Reply-To: <1729ae21-d08c-b413-51a3-f22c394b388d@arm.com> References: <1520260166-29387-1-git-send-email-nipun.gupta@nxp.com> <1520260166-29387-6-git-send-email-nipun.gupta@nxp.com> <20180305150814.GA15918@lst.de> <7b4f9972-6aaa-fc9d-3854-d48b19a8051c@arm.com> <20180305183938.GB20086@lst.de> <1729ae21-d08c-b413-51a3-f22c394b388d@arm.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org > From: Robin Murphy [mailto:robin.murphy at arm.com] > Sent: Tuesday, March 06, 2018 0:22 > > On 05/03/18 18:39, Christoph Hellwig wrote: > > On Mon, Mar 05, 2018 at 03:48:32PM +0000, Robin Murphy wrote: > >> Unfortunately for us, fsl-mc is conceptually rather like PCI in that it's > >> software-discoverable and the only thing described in DT is the bus "host", > >> thus we need the same sort of thing as for PCI to map from the child > >> devices back to the bus root in order to find the appropriate firmware > >> node. Worse than PCI, though, we wouldn't even have the option of > >> describing child devices statically in firmware at all, since it's actually > >> one of these runtime-configurable "build your own network accelerator" > >> hardware pools where userspace gets to create and destroy "devices" as it > >> likes. > > > > I really hate the PCI special case just as much. Maybe we just > > need a dma_configure method on the bus, and move PCI as well as fsl-mc > > to it. > > Hmm, on reflection, 100% ack to that idea. It would neatly supersede > bus->force_dma *and* mean that we don't have to effectively pull pci.h > into everything, which I've never liked. In hindsight dma_configure() > does feel like it's grown into this odd choke point where we munge > everything in just for it to awkwardly unpick things again. > > Robin. +1 to the idea. Sorry for asking a trivial question - looking into dma_configure() I see that PCI is used in the start and the end of the API. In the end part pci_put_host_bridge_device() is called. So are two bus callbacks something like 'dma_config_start' & 'dma_config_end' will be required where the former one will return "dma_dev"? Regards, Nipun