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[109.252.170.211]) by smtp.googlemail.com with ESMTPSA id l26sm690804lfj.22.2020.08.20.12.51.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Aug 2020 12:51:03 -0700 (PDT) Subject: Re: [PATCH 16/18] staging/media/tegra-vde: Clean up IOMMU workaround To: Robin Murphy , hch@lst.de, joro@8bytes.org, linux@armlinux.org.uk References: <3535c205b9bce52556abbf2f63384fb38e009df9.1597931876.git.robin.murphy@arm.com> From: Dmitry Osipenko Message-ID: <07135a55-cbc9-83e5-60dc-731282192554@gmail.com> Date: Thu, 20 Aug 2020 22:51:02 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <3535c205b9bce52556abbf2f63384fb38e009df9.1597931876.git.robin.murphy@arm.com> Content-Language: en-US Cc: geert+renesas@glider.be, dri-devel@lists.freedesktop.org, matthias.bgg@gmail.com, thierry.reding@gmail.com, laurent.pinchart@ideasonboard.com, will@kernel.org, linux-samsung-soc@vger.kernel.org, magnus.damm@gmail.com, kyungmin.park@samsung.com, jonathanh@nvidia.com, agross@kernel.org, linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, inki.dae@samsung.com, linux-mediatek@lists.infradead.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, sw0312.kim@samsung.com, linux-kernel@vger.kernel.org, t-kristo@ti.com, iommu@lists.linux-foundation.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" MjAuMDguMjAyMCAxODowOCwgUm9iaW4gTXVycGh5INC/0LjRiNC10YI6Cj4gTm93IHRoYXQgYXJj aC9hcm0gaXMgd2lyZWQgdXAgZm9yIGRlZmF1bHQgZG9tYWlucyBhbmQgaW9tbXUtZG1hLCB3ZSBu bwo+IGxvbmdlciBuZWVkIHRvIHdvcmsgYXJvdW5kIHRoZSBhcmNoLXByaXZhdGUgbWFwcGluZy4K PiAKPiBTaWduZWQtb2ZmLWJ5OiBSb2JpbiBNdXJwaHkgPHJvYmluLm11cnBoeUBhcm0uY29tPgo+ IC0tLQo+ICBkcml2ZXJzL3N0YWdpbmcvbWVkaWEvdGVncmEtdmRlL2lvbW11LmMgfCAxMiAtLS0t LS0tLS0tLS0KPiAgMSBmaWxlIGNoYW5nZWQsIDEyIGRlbGV0aW9ucygtKQo+IAo+IGRpZmYgLS1n aXQgYS9kcml2ZXJzL3N0YWdpbmcvbWVkaWEvdGVncmEtdmRlL2lvbW11LmMgYi9kcml2ZXJzL3N0 YWdpbmcvbWVkaWEvdGVncmEtdmRlL2lvbW11LmMKPiBpbmRleCA2YWY4NjNkOTIxMjMuLjRmNzcw MTg5ZWQzNCAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3N0YWdpbmcvbWVkaWEvdGVncmEtdmRlL2lv bW11LmMKPiArKysgYi9kcml2ZXJzL3N0YWdpbmcvbWVkaWEvdGVncmEtdmRlL2lvbW11LmMKPiBA QCAtMTAsMTAgKzEwLDYgQEAKPiAgI2luY2x1ZGUgPGxpbnV4L2tlcm5lbC5oPgo+ICAjaW5jbHVk ZSA8bGludXgvcGxhdGZvcm1fZGV2aWNlLmg+Cj4gIAo+IC0jaWYgSVNfRU5BQkxFRChDT05GSUdf QVJNX0RNQV9VU0VfSU9NTVUpCj4gLSNpbmNsdWRlIDxhc20vZG1hLWlvbW11Lmg+Cj4gLSNlbmRp Zgo+IC0KPiAgI2luY2x1ZGUgInZkZS5oIgo+ICAKPiAgaW50IHRlZ3JhX3ZkZV9pb21tdV9tYXAo c3RydWN0IHRlZ3JhX3ZkZSAqdmRlLAo+IEBAIC03MCwxNCArNjYsNiBAQCBpbnQgdGVncmFfdmRl X2lvbW11X2luaXQoc3RydWN0IHRlZ3JhX3ZkZSAqdmRlKQo+ICAJaWYgKCF2ZGUtPmdyb3VwKQo+ ICAJCXJldHVybiAwOwo+ICAKPiAtI2lmIElTX0VOQUJMRUQoQ09ORklHX0FSTV9ETUFfVVNFX0lP TU1VKQo+IC0JaWYgKGRldi0+YXJjaGRhdGEubWFwcGluZykgewo+IC0JCXN0cnVjdCBkbWFfaW9t bXVfbWFwcGluZyAqbWFwcGluZyA9IHRvX2RtYV9pb21tdV9tYXBwaW5nKGRldik7Cj4gLQo+IC0J CWFybV9pb21tdV9kZXRhY2hfZGV2aWNlKGRldik7Cj4gLQkJYXJtX2lvbW11X3JlbGVhc2VfbWFw cGluZyhtYXBwaW5nKTsKPiAtCX0KPiAtI2VuZGlmCj4gIAl2ZGUtPmRvbWFpbiA9IGlvbW11X2Rv bWFpbl9hbGxvYygmcGxhdGZvcm1fYnVzX3R5cGUpOwo+ICAJaWYgKCF2ZGUtPmRvbWFpbikgewo+ ICAJCWVyciA9IC1FTk9NRU07Cj4gCgpIZWxsbywgUm9iaW4hIFRoYW5rIHlvdSBmb3IgeW91cnMg d29yayEKClNvbWUgZHJpdmVycywgbGlrZSB0aGlzIFRlZ3JhIFZERSAoVmlkZW8gRGVjb2RlciBF bmdpbmUpIGRyaXZlciBmb3IKZXhhbXBsZSwgZG8gbm90IHdhbnQgdG8gdXNlIGltcGxpY2l0IElP TU1VIGRvbWFpbi4gVGVncmEgVkRFIGRyaXZlcgpyZWxpZXMgb24gZXhwbGljaXQgSU9NTVUgZG9t YWluIGluIGEgY2FzZSBvZiBUZWdyYSBTTU1VIGJlY2F1c2UgVkRFCmhhcmR3YXJlIGNhbid0IGFj Y2VzcyBsYXN0IHBhZ2Ugb2YgdGhlIEFTIGFuZCBiZWNhdXNlIGRyaXZlciB3YW50cyB0bwpyZXNl cnZlIHNvbWUgZml4ZWQgYWRkcmVzc2VzIFsxXS4KClsxXQpodHRwczovL2VsaXhpci5ib290bGlu LmNvbS9saW51eC92NS45LXJjMS9zb3VyY2UvZHJpdmVycy9zdGFnaW5nL21lZGlhL3RlZ3JhLXZk ZS9pb21tdS5jI0wxMDAKClRlZ3JhMzAgU29DIHN1cHBvcnRzIHVwIHRvIDQgZG9tYWlucywgaGVu Y2UgaXQncyBub3QgcG9zc2libGUgdG8gYWZmb3JkCndhc3RpbmcgdW51c2VkIGltcGxpY2l0IGRv bWFpbnMuIEkgdGhpbmsgdGhpcyBuZWVkcyB0byBiZSBhZGRyZXNzZWQKYmVmb3JlIHRoaXMgcGF0 Y2ggY291bGQgYmUgYXBwbGllZC4KCldvdWxkIGl0IGJlIHBvc3NpYmxlIGZvciBJT01NVSBkcml2 ZXJzIHRvIGdhaW4gc3VwcG9ydCBmb3IgZmlsdGVyaW5nIG91dApkZXZpY2VzIGluIGlvbW11X2Rv bWFpbl9hbGxvYyhkZXYsIHR5cGUpPyBUaGVuIHBlcmhhcHMgVGVncmEgU01NVSBkcml2ZXIKY291 bGQgc2ltcGx5IHJldHVybiBOVUxMIGluIGEgY2FzZSBvZiB0eXBlPUlPTU1VX0RPTUFJTl9ETUEg YW5kCmRldj10ZWdyYS12ZGUuCgpBbHRlcm5hdGl2ZWx5LCB0aGUgVGVncmEgU01NVSBjb3VsZCBi ZSBjaGFuZ2VkIHN1Y2ggdGhhdCB0aGUgZGV2aWNlcwp3aWxsIGJlIGF0dGFjaGVkIHRvIGEgZG9t YWluIGF0IHRoZSB0aW1lIG9mIGEgZmlyc3QgSU9NTVUgbWFwcGluZwppbnZvY2F0aW9uIGluc3Rl YWQgb2YgYXR0YWNoaW5nIGF0IHRoZSB0aW1lIG9mIGF0dGFjaF9kZXYoKSBjYWxsYmFjawppbnZv Y2F0aW9uLgoKT3IgbWF5YmUgZXZlbiBJT01NVSBjb3JlIGNvdWxkIGJlIGNoYW5nZWQgdG8gYXR0 YWNoIGRldmljZXMgYXQgdGhlIHRpbWUKb2YgdGhlIGZpcnN0IElPTU1VIG1hcHBpbmcgaW52b2Nh dGlvbj8gVGhpcyBjb3VsZCBiZSBhIHVuaXZlcnNhbApzb2x1dGlvbiBmb3IgYWxsIGRyaXZlcnMu CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwppb21tdSBt YWlsaW5nIGxpc3QKaW9tbXVAbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0 cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vaW9tbXU=