From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robin Murphy Subject: Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU Date: Fri, 27 Jul 2018 17:02:37 +0100 Message-ID: References: <20180726231624.21084-1-digetx@gmail.com> <20180727082512.lpvmeuvxnw3mpeym@8bytes.org> <20180727090328.GH28088@arm.com> <4164951.xGHfcFJ9uZ@dimapc> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <4164951.xGHfcFJ9uZ@dimapc> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Dmitry Osipenko , Will Deacon , Joerg Roedel Cc: devicetree@vger.kernel.org, Mikko Perttunen , nouveau@lists.freedesktop.org, "Rafael J. Wysocki" , Nicolas Chauvet , Greg Kroah-Hartman , Russell King , dri-devel@lists.freedesktop.org, Jonathan Hunter , iommu@lists.linux-foundation.org, Rob Herring , Thierry Reding , Ben Skeggs , Catalin Marinas , linux-tegra@vger.kernel.org, Frank Rowand , linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org T24gMjcvMDcvMTggMTU6MTAsIERtaXRyeSBPc2lwZW5rbyB3cm90ZToKPiBPbiBGcmlkYXksIDI3 IEp1bHkgMjAxOCAxMjowMzoyOCBNU0sgV2lsbCBEZWFjb24gd3JvdGU6Cj4+IE9uIEZyaSwgSnVs IDI3LCAyMDE4IGF0IDEwOjI1OjEzQU0gKzAyMDAsIEpvZXJnIFJvZWRlbCB3cm90ZToKPj4+IE9u IEZyaSwgSnVsIDI3LCAyMDE4IGF0IDAyOjE2OjE4QU0gKzAzMDAsIERtaXRyeSBPc2lwZW5rbyB3 cm90ZToKPj4+PiBUaGUgcHJvcG9zZWQgc29sdXRpb24gYWRkcyBhIG5ldyBvcHRpb24gdG8gdGhl IGJhc2UgZGV2aWNlIGRyaXZlcgo+Pj4+IHN0cnVjdHVyZSB0aGF0IGFsbG93cyBkZXZpY2UgZHJp dmVycyB0byBleHBsaWNpdGx5IGNvbnZleSB0byB0aGUgZHJpdmVycwo+Pj4+IGNvcmUgdGhhdCB0 aGUgaW1wbGljaXQgSU9NTVUgYmFja2luZyBmb3IgZGV2aWNlcyBtdXN0IG5vdCBoYXBwZW4uCj4+ Pgo+Pj4gV2h5IGlzIElPTU1VIG1hcHBpbmcgYSBwcm9ibGVtIGZvciB0aGUgVGVncmEgR1BVIGRy aXZlcj8KPj4+Cj4+PiBJZiB3ZSBhZGQgc29tZXRoaW5nIGxpa2UgdGhpcyB0aGVuIGl0IHNob3Vs ZCBub3QgYmUgdGhlIGNob2ljZSBvZiB0aGUKPj4+IGRldmljZSBkcml2ZXIsIGJ1dCBvZiB0aGUg dXNlciBhbmQvb3IgdGhlIGZpcm13YXJlLgo+Pgo+PiBBZ3JlZWQsIGFuZCBpdCB3b3VsZCBzdGls bCBuZWVkIHNvbWVib2R5IHRvIGNvbmZpZ3VyZSBhbiBpZGVudGl0eSBkb21haW4gc28KPj4gdGhh dCB0cmFuc2FjdGlvbnMgYXJlbid0IGFib3J0ZWQgaW1tZWRpYXRlbHkuIFdlIGN1cnJlbnRseSBh bGxvdyB0aGUKPj4gaWRlbnRpdHkgZG9tYWluIHRvIGJlIHVzZWQgYnkgZGVmYXVsdCB2aWEgYSBj b21tYW5kLWxpbmUgb3B0aW9uLCBzbyBJIGd1ZXNzCj4+IHdlJ2QgbmVlZCBhIHdheSBmb3IgZmly bXdhcmUgdG8gcmVxdWVzdCB0aGF0IG9uIGEgcGVyLWRldmljZSBiYXNpcy4KPiAKPiBUaGUgSU9N TVUgbWFwcGluZyBpdHNlbGYgaXMgbm90IGEgcHJvYmxlbSwgdGhlIHByb2JsZW0gaXMgdGhlIG1h bmFnZW1lbnQgb2YKPiB0aGUgSU9NTVUuIEZvciBUZWdyYSB3ZSBkb24ndCB3YW50IGFueXRoaW5n IHRvIGludHJ1ZGUgaW50byB0aGUgSU9NTVUKPiBhY3Rpdml0aWVzIGJlY2F1c2U6Cj4gCj4gMSkg R1BVIEhXIHJlcXVpcmUgYWRkaXRpb25hbCBjb25maWd1cmF0aW9uIGZvciB0aGUgSU9NTVUgdXNh Z2UgYW5kIGR1bWIKPiBtYXBwaW5nIG9mIHRoZSBhbGxvY2F0aW9ucyBzaW1wbHkgZG9lc24ndCB3 b3JrLgoKR2VuZXJhbGx5LCB0aGF0J3MgYWxyZWFkeSBoYW5kbGVkIGJ5IHRoZSBEUk0gZHJpdmVy cyBhbGxvY2F0aW5nIHRoZWlyIApvd24gdW5tYW5hZ2VkIGRvbWFpbnMuIFRoZSBvbmx5IHByb2Js ZW0gd2UgcmVhbGx5IG5lZWQgdG8gc29sdmUgaW4gdGhhdCAKcmVnYXJkIGlzIHRoYXQgY3VycmVu dGx5IHRoZSBkZXZpY2UgRE1BIG9wcyBkb24ndCBnZXQgdXBkYXRlZCB3aGVuIAptb3ZpbmcgYXdh eSBmcm9tIHRoZSBtYW5hZ2VkIGRvbWFpbi4gVGhhdCdzIGJlZW4gT0sgZm9yIHRoZSBWRklPIGNh c2UgCndoZXJlIHRoZSBkZXZpY2UgaXMgYm91bmQgdG8gYSBkaWZmZXJlbnQgZHJpdmVyIHdoaWNo IHdlIGtub3cgd29uJ3QgbWFrZSAKYW55IGV4cGxpY2l0IERNQSBBUEkgY2FsbHMsIGJ1dCBmb3Ig dGhlIG1vcmUgZ2VuZXJhbCBjYXNlIG9mIElPTU1VLWF3YXJlIApkcml2ZXJzIHdlIGNvdWxkIGNl cnRhaW5seSBkbyB3aXRoIGEgYml0IG9mIGNvb3BlcmF0aW9uIGJldHdlZW4gdGhlIApJT01NVSBB UEksIERNQSBBUEksIGFuZCBhcmNoIGNvZGUgdG8gdXBkYXRlIHRoZSBETUEgb3BzIGR5bmFtaWNh bGx5IHRvIApjb3BlIHdpdGggaW50ZXJtZWRpYXRlIHN1YnN5c3RlbXMgbWFraW5nIERNQSBBUEkg Y2FsbHMgb24gYmVoYWxmIG9mIApkZXZpY2VzIHRoZXkgZG9uJ3Qga25vdyB0aGUgaW50aW1hdGUg ZGV0YWlscyBvZi4KCj4gMikgT2xkZXIgVGVncmEgZ2VuZXJhdGlvbnMgaGF2ZSBhIGxpbWl0ZWQg cmVzb3VyY2UgYW5kIGNhcGFiaWxpdGllcyBpbiByZWdhcmRzCj4gdG8gSU9NTVUgdXNhZ2UsIGFs bG9jYXRpbmcgSU9NTVUgZG9tYWluIHBlci1kZXZpY2UgaXMganVzdCBpbXBvc3NpYmxlIGZvcgo+ IGV4YW1wbGUuCj4gCj4gMykgSFcgcGVyZm9ybXMgY29udGV4dCBzd2l0Y2hlcyBhbmQgc28gcGFy dGljdWxhciBhbGxvY2F0aW9ucyBoYXZlIHRvIGJlCj4gYXNzaWduZWQgdG8gYSBwYXJ0aWN1bGFy IGNvbnRleHRzIElPTU1VIGRvbWFpbi4KCkkgdW5kZXJzdGFuZCBRdWFsY29tbSBTb0NzIGhhdmUg YSBzaW1pbGFyIHRoaW5nIHRvbywgYW5kIEFGQUlDUyB0aGF0IApjYXNlIGp1c3QgZG9lc24ndCBm aXQgaW50byB0aGUgY3VycmVudCBBUEkgbW9kZWwgYXQgYWxsLiBXZSBuZWVkIHRoZSAKSU9NTVUg ZHJpdmVyIHRvIHNvbWVob3cga25vdyBhYm91dCB0aGUgc3BlY2lmaWMgZGV0YWlscyBvZiB3aGlj aCBkZXZpY2VzIApoYXZlIG1hZ2ljIGFzc29jaWF0aW9ucyB3aXRoIHNwZWNpZmljIGNvbnRleHRz LCBhbmQgd2UgYWxtb3N0IGNlcnRhaW5seSAKbmVlZCBhIG1vcmUgZXhwcmVzc2l2ZSBpbnRlcmZh Y2UgdGhhbiBpb21tdV9kb21haW5fYWxsb2MoKSB0byBoYXZlIGFueSAKaG9wZSBvZiByZWxpYWJs ZSByZXN1bHRzLgoKUm9iaW4uCgo+IFNvbWUgb2YgdGhlIGFib3ZlIGlzIGR1ZSB0byBhIFNXIGRy aXZlciBtb2RlbCAoYW5kIGl0cyB3b3JrLWluLXByb2dyZXNzCj4gc3RhdHVzKSwgb3RoZXIgaXMg ZHVlIHRvIGEgSFcgbW9kZWwuIFNvIGVzc2VudGlhbGx5IHdlIG5lZWQgYSB3YXkgZm9yIGEgZHJp dmVyCj4gdG8gdGVsbCB0aGUgY29yZSBub3QgdG8gbWVzcyB3aXRoIElPTU1VIHN0dWZmIG9mIGRy aXZlcnMgZGV2aWNlIGJlaGluZCB0aGUKPiBkcml2ZXJzIGJhY2suCj4gCj4gSSdtIG5vdCBzdXJl IHdoYXQgeW91IGd1eXMgYXJlIG1lYW5pbmcgYnkgdGhlICJmaXJtd2FyZSIsIGNvdWxkIHlvdSBl bGFib3JhdGUKPiBwbGVhc2U/IERvIHlvdSBtZWFuIHRoZSBPcGVuIEZpcm13YXJlIGFuZCBoZW5j ZSB0aGUgZGV2aWNldHJlZSBvciB3aGF0Pwo+IAo+IAo+IAo+IF9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fCj4gaW9tbXUgbWFpbGluZyBsaXN0Cj4gaW9tbXVA bGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKPiBodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlv bi5vcmcvbWFpbG1hbi9saXN0aW5mby9pb21tdQo+IApfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBs aXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1h bi9saXN0aW5mby9kcmktZGV2ZWwK