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[109.252.193.102]) by smtp.googlemail.com with ESMTPSA id d15sm1329008lfn.7.2021.04.26.00.39.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Apr 2021 00:39:26 -0700 (PDT) Subject: Re: [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was needed for Nyan Big Chromebook To: Thierry Reding References: <20210328233256.20494-1-digetx@gmail.com> <20210328233256.20494-2-digetx@gmail.com> <20210401085549.GA31146@Asurada-Nvidia> <50a7e4c7-0e72-534a-a317-366e455213c1@gmail.com> <724e683f-5317-cdf7-7351-fcfd42b7b607@gmail.com> <5ec2be61-a70e-e3b1-9267-414793c32a04@gmail.com> From: Dmitry Osipenko Message-ID: <19834018-4ac7-a8fd-f7df-199128b04e4e@gmail.com> Date: Mon, 26 Apr 2021 10:39:25 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: Guillaume Tucker , iommu@lists.linux-foundation.org, Jonathan Hunter , linux-tegra@vger.kernel.org, Will Deacon , linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" MjYuMDQuMjAyMSAxMDoxNCwgVGhpZXJyeSBSZWRpbmcg0L/QuNGI0LXRgjoKPiBPbiBTYXQsIEFw ciAyNCwgMjAyMSBhdCAxMToyNzoxMFBNICswMzAwLCBEbWl0cnkgT3NpcGVua28gd3JvdGU6Cj4+ IDIzLjA0LjIwMjEgMTg6MjMsIERtaXRyeSBPc2lwZW5rbyDQv9C40YjQtdGCOgo+Pj4gMjMuMDQu MjAyMSAxODowMSwgR3VpbGxhdW1lIFR1Y2tlciDQv9C40YjQtdGCOgo+Pj4+IE9uIDAyLzA0LzIw MjEgMTU6NDAsIERtaXRyeSBPc2lwZW5rbyB3cm90ZToKPj4+Pj4gMDEuMDQuMjAyMSAxMTo1NSwg Tmljb2xpbiBDaGVuINC/0LjRiNC10YI6Cj4+Pj4+PiBPbiBNb24sIE1hciAyOSwgMjAyMSBhdCAw MjozMjo1NkFNICswMzAwLCBEbWl0cnkgT3NpcGVua28gd3JvdGU6Cj4+Pj4+Pj4gVGhlIHByZXZp b3VzIGNvbW1pdCBmaXhlcyBwcm9ibGVtIHdoZXJlIGRpc3BsYXkgY2xpZW50IHdhcyBhdHRhY2hp bmcgdG9vCj4+Pj4+Pj4gZWFybHkgdG8gSU9NTVUgZHVyaW5nIGtlcm5lbCBib290IGluIGEgbXVs dGktcGxhdGZvcm0ga2VybmVsIGNvbmZpZ3VyYXRpb24KPj4+Pj4+PiB3aGljaCBlbmFibGVzIENP TkZJR19BUk1fRE1BX1VTRV9JT01NVT15LiBUaGUgd29ya2Fyb3VuZCB0aGF0IGhlbHBlZCB0bwo+ Pj4+Pj4+IGRlZmVyIHRoZSBJT01NVSBhdHRhY2htZW50IGZvciBOeWFuIEJpZyBDaHJvbWVib29r IGlzbid0IG5lZWRlZCBhbnltb3JlLAo+Pj4+Pj4+IHJldmVydCBpdC4KPj4+Pj4+Cj4+Pj4+PiBT b3JyeSBmb3IgdGhlIGxhdGUgcmVwbHkuIEkgaGF2ZSBiZWVuIGJ1c3kgd2l0aCBkb3duc3RyZWFt IHRhc2tzLgo+Pj4+Pj4KPj4+Pj4+IEkgd2lsbCBnaXZlIHRoZW0gYSB0cnkgYnkgdGhlIGVuZCBv ZiB0aGUgd2Vlay4gWWV0LCBwcm9iYWJseSBpdCdkCj4+Pj4+PiBiZSBiZXR0ZXIgdG8gaW5jbHVk ZSBHdWlsbGF1bWUgYWxzbyBhcyBoZSBoYXMgdGhlIE55YW4gcGxhdGZvcm0uCj4+Pj4+Pgo+Pj4+ Pgo+Pj4+PiBJbmRlZWQsIHRoYW5rcy4gQWx0aG91Z2gsIEknbSBwcmV0dHkgc3VyZSB0aGF0IGl0 J3MgdGhlIHNhbWUgaXNzdWUgd2hpY2gKPj4+Pj4gSSByZXByb2R1Y2VkIG9uIE5leHVzIDcuCj4+ Pj4+Cj4+Pj4+IEd1aWxsYXVtZSwgY291bGQgeW91IHBsZWFzZSBnaXZlIGEgdGVzdCB0byB0aGVz ZSBwYXRjaGVzIG9uIE55YW4gQmlnPwo+Pj4+PiBUaGVyZSBzaG91bGQgYmUgbm8gRU1FTSBlcnJv cnMgaW4gdGhlIGtlcm5lbCBsb2cgd2l0aCB0aGlzIHBhdGNoZXMuCj4+Pj4+Cj4+Pj4+IGh0dHBz Oi8vcGF0Y2h3b3JrLm96bGFicy5vcmcvcHJvamVjdC9saW51eC10ZWdyYS9saXN0Lz9zZXJpZXM9 MjM2MjE1Cj4+Pj4KPj4+PiBTbyBzb3JyeSBmb3IgdGhlIHZlcnkgbGF0ZSByZXBseS4gIEkgaGF2 ZSB0cmllZCB0aGUgcGF0Y2hlcyBidXQKPj4+PiBoaXQgc29tZSBpc3N1ZXMgb24gbGludXgtbmV4 dCwgaXQncyBub3QgcmVhY2hpbmcgYSBsb2dpbiBwcm9tcHQKPj4+PiB3aXRoIG5leHQtMjAyMTA0 MjIuICBTbyBJIHRoZW4gdHJpZWQgd2l0aCBuZXh0LTIwMjEwNDE5IHdoaWNoCj4+Pj4gZG9lcyBi b290IGJ1dCBzaG93cyB0aGUgSU9NTVUgZXJyb3I6Cj4+Pj4KPj4+PiA8Nj5bICAgIDIuOTk1MzQx XSB0ZWdyYS1kYyA1NDIwMDAwMC5kYzogQWRkaW5nIHRvIGlvbW11IGdyb3VwIDEKPj4+PiA8ND5b ICAgIDMuMDAxMDcwXSBGYWlsZWQgdG8gYXR0YWNoZWQgZGV2aWNlIDU0MjAwMDAwLmRjIHRvIElP TU1VX21hcHBpbmcgIAo+Pj4+Cj4+Pj4gICBodHRwczovL2xhdmEuY29sbGFib3JhLmNvLnVrL3Nj aGVkdWxlci9qb2IvMzU3MDA1MiNMMTEyMAo+Pj4+Cj4+Pj4gVGhlIGJyYW5jaCBJJ20gdXNpbmcg d2l0aCB0aGUgcGF0Y2hlcyBhcHBsaWVkIGNhbiBiZSBmb3VuZCBoZXJlOgo+Pj4+Cj4+Pj4gICBo dHRwczovL2dpdGxhYi5jb2xsYWJvcmEuY29tL2d0dWNrZXIvbGludXgvLS9jb21taXRzL25leHQt MjAyMTA0MTktbnlhbi1iaWctZHJtLXJlYWQvCj4+Pj4KPj4+PiBIb3BlIHRoaXMgaGVscHMsIGxl dCBtZSBrbm93IGlmIHlvdSBuZWVkIGFueXRoaW5nIGVsc2UgdG8gYmUKPj4+PiB0ZXN0ZWQuCj4+ Pgo+Pj4KPj4+IEhlbGxvIEd1aWxsYXVtZSwKPj4+Cj4+PiBUaGUgY3VycmVudCBsaW51eC1uZXh0 IGRvZXNuJ3QgYm9vdCBvbiBhbGwgQVJNIChBRkFJSyksIHRoZSBvbGRlcgo+Pj4gbmV4dC0yMDIx MDQxMyB3b3Jrcy4gVGhlIGFib3ZlIG1lc3NhZ2Ugc2hvdWxkIGJlIHVucmVsYXRlZCB0byB0aGUg Ym9vdAo+Pj4gcHJvYmxlbS4gSXQgc2hvdWxkIGJlIG9rYXkgdG8gaWdub3JlIHRoYXQgbWVzc2Fn ZSBhcyBpdCBzaG91bGQgYmUKPj4+IGhhcm1sZXNzIGluIHlvdXJzIGNhc2UuCj4+Pgo+Pgo+PiBB bHRob3VnaCwgdGhlIDIwMjEwNDE5IHNob3VsZCBiZSBnb29kLgo+Pgo+PiBUaGllcnJ5LCBkbyB5 b3Uga25vdyB3aGF0IHRob3NlIFNPUiBhbmQgTm91dmVhdSBpc3N1ZXMgYXJlIGFib3V0Pwo+IAo+ IFRoZXJlJ3MgYSB1c2UtYWZ0ZXItZnJlZSAodGhvdWdoIGl0J3MgcmVhbGx5IGEgdXNlLWJlZm9y ZS1pbml0KSBpc3N1ZSBpbgo+IGxpbnV4LW5leHQgYXQgdGhlIG1vbWVudCwgYnV0IGEgZml4IGhh cyBiZWVuIHN1Z2dlc3RlZC4gVGhlIGZpeCBmb3IgdGhpcwo+IGFsb25nIHdpdGggYW4gYWRkaXRp b25hbCBsZWFrIHBsdWcgaXMgaGVyZToKPiAKPiAJaHR0cDovL3BhdGNod29yay5vemxhYnMub3Jn L3Byb2plY3QvbGludXgtdGVncmEvbGlzdC8/c2VyaWVzPTI0MDU2OQoKTmljZSwgdGhhbmsgeW91 LiBNYXliZSBHdWlsbGF1bWUgY291bGQgZ2l2ZSBpdCBhIHRlc3QuCgo+IEknbSBub3QgYXdhcmUg b2YgYW55IE5vdXZlYXUgaXNzdWVzLiBXaGF0IHZlcnNpb24gYW5kIHBsYXRmb3JtIGFyZSB0aG9z ZQo+IGhhcHBlbmluZyBvbj8gQXJlIHRoZXJlIGFueSBsb2dzPyBJIGNhbid0IHNlZW0gdG8gZmlu ZCB0aGVtIGluIHRoaXMKPiB0aHJlYWQuCgpUaGlzIGFsbCBpcyBvbiBOeWFuIEJpZyB1c2luZyBs aW51eC1uZXh0LTIwMjEwNDE5LiBUaGVyZSBpcyBhIGxpbmsgdG8gdGhlIGZ1bGwgbG9nIGFib3Zl LgoKSSBzZWUgdGhpcyBOb3V2ZWF1IGZhaWx1cmU6Cgo8Nj5bICAgMTkuMzIzMTEzXSBub3V2ZWF1 IDU3MDAwMDAwLmdwdTogQWRkaW5nIHRvIGlvbW11IGdyb3VwIDIKPDY+WyAgIDE5LjMyMzYxNV0g bm91dmVhdSA1NzAwMDAwMC5ncHU6IE5WSURJQSBHSzIwQSAoMGVhMDAwYTEpCjw2PlsgICAxOS4z MjM2NjhdIG5vdXZlYXUgNTcwMDAwMDAuZ3B1OiBpbWVtOiB1c2luZyBJT01NVQo8Mz5bICAgMTku MzIzNzk1XSBub3V2ZWF1IDU3MDAwMDAwLmdwdTogZ3IgY3RvciBmYWlsZWQ6IC0yCjw0PlsgICAx OS4zMjM5ODNdIG5vdXZlYXU6IHByb2JlIG9mIDU3MDAwMDAwLmdwdSBmYWlsZWQgd2l0aCBlcnJv ciAtMgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9t bXUgbWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8v bGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11