From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EF08C433DB for ; Mon, 15 Feb 2021 14:43:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B47464DF4 for ; Mon, 15 Feb 2021 14:43:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230133AbhBOOnf (ORCPT ); Mon, 15 Feb 2021 09:43:35 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:34274 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229981AbhBOOne (ORCPT ); Mon, 15 Feb 2021 09:43:34 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mtapsc-1-3w3CI_4oMWS3JDUYMjvGuQ-1; Mon, 15 Feb 2021 14:41:54 +0000 X-MC-Unique: 3w3CI_4oMWS3JDUYMjvGuQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Mon, 15 Feb 2021 14:41:52 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Mon, 15 Feb 2021 14:41:52 +0000 From: David Laight To: =?utf-8?B?J0NocmlzdGlhbiBLw7ZuaWcn?= , "Lucas Stach" , Simon Ser CC: "linaro-mm-sig@lists.linaro.org" , "Sharma, Shashank" , lkml , dri-devel , linux-media Subject: RE: DMA-buf and uncached system memory Thread-Topic: DMA-buf and uncached system memory Thread-Index: AQHXA5L/eppUoUE81k6k7v7UJlaBDapZRehQ Date: Mon, 15 Feb 2021 14:41:52 +0000 Message-ID: References: <91ff0bbb-ea3a-2663-3453-dea96ccd6dd8@amd.com> <8d23f1ca6fe76d8971365bf54ca71ba71698980d.camel@pengutronix.de> <7ecf008d-a1f5-ddff-c8ac-8e7bfaf9c680@amd.com> In-Reply-To: <7ecf008d-a1f5-ddff-c8ac-8e7bfaf9c680@amd.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org RnJvbTogQ2hyaXN0aWFuIEvDtm5pZw0KPiBTZW50OiAxNSBGZWJydWFyeSAyMDIxIDEyOjA1DQou Li4NCj4gU25vb3BpbmcgdGhlIENQVSBjYWNoZXMgaW50cm9kdWNlcyBzb21lIGV4dHJhIGxhdGVu Y3ksIHNvIHdoYXQgY2FuDQo+IGhhcHBlbiBpcyB0aGF0IHRoZSByZXNwb25zZSB0byB0aGUgUENJ ZSByZWFkIGNvbWVzIHRvIGxhdGUgZm9yIHRoZQ0KPiBzY2Fub3V0LiBUaGUgcmVzdWx0IGlzIGFu IHVuZGVyZmxvdyBhbmQgZmxpY2tlcmluZyB3aGVuZXZlciBzb21ldGhpbmcgaXMNCj4gaW4gdGhl IGNhY2hlIHdoaWNoIG5lZWRzIHRvIGJlIGZsdXNoZWQgZmlyc3QuDQoNCkFyZW4ndCB5b3UgZ29p bmcgdG8gZ2V0IHRoZSBzYW1lIHByb2JsZW0gaWYgYW55IG90aGVyIGVuZHBvaW50cyBhcmUNCmRv aW5nIG1lbW9yeSByZWFkcz8NClBvc3NpYmx5IGV2ZW4gb25lcyB0aGF0IGRvbid0IHJlcXVpcmUg YSBjYWNoZSBzbm9vcCBhbmQgZmx1c2guDQoNCldoYXQgYWJvdXQganVzdCB0aGUgY3B1IGRvaW5n IGEgcmVhbCBtZW1vcnkgdHJhbnNmZXI/DQoNCk9yIGEgY29tYmluYXRpb24gb2YgdGhlIHR3byBh Ym92ZSBoYXBwZW5pbmcganVzdCBiZWZvcmUgeW91ciByZXF1ZXN0Lg0KDQpJZiB5b3UgZG9uJ3Qg aGF2ZSBhIGJpZyBlbm91Z2ggZmlmbyB5b3UnbGwgbG9zZS4NCg0KSSBkaWQgJ2ZpeCcgYSBzaW1p bGFyKGlzaCkgaXNzdWUgd2l0aCB2aWRlbyBETUEgbGF0ZW5jeSBvbiBhbiBlbWJlZGRlZA0Kc3lz dGVtIGJhc2VkIHRoZSBvbiBTQTExMDAvU0ExMTAxIGJ5IHNpZ25pZmljYW50bHkgcmVkdWNpbmcg dGhlIGNsb2NrDQp0byB0aGUgVkdBIHBhbmVsIHdoZW5ldmVyIHRoZSBjcHUgd2FzIGRvaW5nICdz bG93IGlvJy4NCihJbnRlcmxlYXZpbmcgYW4gdW5jYWNoZWQgY3B1IERSQU0gd3JpdGUgYmV0d2Vl biB0aGUgc2xvdyBpbyBjeWNsZXMNCmFsc28gZml4ZWQgaXQuKQ0KQnV0IHRoZSB2aWRlbyB3YXMg dGhlIG9ubHkgRE1BIGRldmljZSBhbmQgdGhhdCB3YXMgYW4gZW1iZWRkZWQgc3lzdGVtLg0KR2l2 ZW4gdGhlIGFwcGxpY2F0aW9uIG5vdGUgYWJvdXQgdmlkZW8gbGF0ZW5jeSBkaWRuJ3QgbWVudGlv biB3aGF0IHdhcw0KYWN0dWFsbHkgaGFwcGVuaW5nLCBJJ20gbm90IHN1cmUgaG93IG1hbnkgcGVv cGxlIGFjdHVhbGx5IGdvdCBpdCB3b3JraW5nIQ0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBB ZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMs IE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K