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[216.228.112.22]) by smtp.gmail.com with ESMTPSA id t3sm895690pje.43.2020.09.29.23.25.05 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 29 Sep 2020 23:25:05 -0700 (PDT) Date: Tue, 29 Sep 2020 23:19:35 -0700 From: Nicolin Chen To: Dmitry Osipenko Subject: Re: [PATCH v2 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev Message-ID: <20200930061935.GB16460@Asurada-Nvidia> References: <20200930003013.31289-1-nicoleotsuka@gmail.com> <20200930003013.31289-3-nicoleotsuka@gmail.com> <20200930054119.GE31821@Asurada-Nvidia> <68c13611-bc3d-5ba6-70ec-29786d69ff9a@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <68c13611-bc3d-5ba6-70ec-29786d69ff9a@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, krzk@kernel.org, jonathanh@nvidia.com, thierry.reding@gmail.com, linux-tegra@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" T24gV2VkLCBTZXAgMzAsIDIwMjAgYXQgMDg6NTk6NDVBTSArMDMwMCwgRG1pdHJ5IE9zaXBlbmtv IHdyb3RlOgo+IDMwLjA5LjIwMjAgMDg6NDEsIE5pY29saW4gQ2hlbiDQv9C40YjQtdGCOgo+ID4g T24gV2VkLCBTZXAgMzAsIDIwMjAgYXQgMDg6Mzk6NTRBTSArMDMwMCwgRG1pdHJ5IE9zaXBlbmtv IHdyb3RlOgo+ID4+IDMwLjA5LjIwMjAgMDM6MzAsIE5pY29saW4gQ2hlbiDQv9C40YjQtdGCOgo+ ID4+PiAgc3RhdGljIGludCB0ZWdyYV9zbW11X2F0dGFjaF9kZXYoc3RydWN0IGlvbW11X2RvbWFp biAqZG9tYWluLAo+ID4+PiAgCQkJCSBzdHJ1Y3QgZGV2aWNlICpkZXYpCj4gPj4+ICB7Cj4gPj4+ ICsJc3RydWN0IGlvbW11X2Z3c3BlYyAqZndzcGVjID0gZGV2X2lvbW11X2Z3c3BlY19nZXQoZGV2 KTsKPiA+Pj4gIAlzdHJ1Y3QgdGVncmFfc21tdSAqc21tdSA9IGRldl9pb21tdV9wcml2X2dldChk ZXYpOwo+ID4+PiAgCXN0cnVjdCB0ZWdyYV9zbW11X2FzICphcyA9IHRvX3NtbXVfYXMoZG9tYWlu KTsKPiA+Pj4gLQlzdHJ1Y3QgZGV2aWNlX25vZGUgKm5wID0gZGV2LT5vZl9ub2RlOwo+ID4+PiAt CXN0cnVjdCBvZl9waGFuZGxlX2FyZ3MgYXJnczsKPiA+Pj4gIAl1bnNpZ25lZCBpbnQgaW5kZXgg PSAwOwo+ID4+PiAgCWludCBlcnIgPSAwOwo+ID4+PiAgCj4gPj4+IC0Jd2hpbGUgKCFvZl9wYXJz ZV9waGFuZGxlX3dpdGhfYXJncyhucCwgImlvbW11cyIsICIjaW9tbXUtY2VsbHMiLCBpbmRleCwK PiA+Pj4gLQkJCQkJICAgJmFyZ3MpKSB7Cj4gPj4+IC0JCXVuc2lnbmVkIGludCBzd2dyb3VwID0g YXJncy5hcmdzWzBdOwo+ID4+PiAtCj4gPj4+IC0JCWlmIChhcmdzLm5wICE9IHNtbXUtPmRldi0+ b2Zfbm9kZSkgewo+ID4+PiAtCQkJb2Zfbm9kZV9wdXQoYXJncy5ucCk7Cj4gPj4+IC0JCQljb250 aW51ZTsKPiA+Pj4gLQkJfQo+ID4+PiAtCj4gPj4+IC0JCW9mX25vZGVfcHV0KGFyZ3MubnApOwo+ ID4+PiArCWlmICghZndzcGVjIHx8IGZ3c3BlYy0+b3BzICE9ICZ0ZWdyYV9zbW11X29wcykKPiA+ Pj4gKwkJcmV0dXJuIC1FTk9FTlQ7Cj4gPj4KPiA+PiBzLyZ0ZWdyYV9zbW11X29wcy9zbW11LT5p b21tdS5vcHMvCj4gPj4KPiA+PiBTZWNvbmRseSwgaXMgaXQgZXZlbiBwb3NzaWJsZSB0aGF0IGZ3 c3BlYyBjb3VsZCBiZSBOVUxMIGhlcmUgb3IgdGhhdAo+ID4+IGZ3c3BlYy0+b3BzICE9IHNtbXUt Pm9wcz8KPiA+IAo+ID4gSSBhbSBmb2xsb3dpbmcgd2hhdCdzIGluIHRoZSBhcm0tc21tdSBkcml2 ZXIsIGFzIEkgdGhpbmsgaXQnZCBiZQo+ID4gYSBjb21tb24gcHJhY3RpY2UgdG8gZG8gc3VjaCBh IGNoZWNrIGluIHN1Y2ggYSB3YXkuCj4gPiAKPiAKPiBQbGVhc2UgY2hlY2sgd2hldGhlciBpdCdz IHJlYWxseSBuZWVkZWQuIEl0IGxvb2tzIGxpa2UgaXQgd2FzIG5lZWRlZAo+IHNvbWV0aW1lIGFn bywgYnV0IHRoYXQncyBub3QgdHJ1ZSBhbnltb3JlLgoKR2l2ZW4gdGhhdCBtb3N0IGlvbW11IGRy aXZlcnMgaGF2ZSAtPm9wcyBjaGVjaywgSSdkIGxpa2UgdG8KaGF2ZSBpdCBhbHNvIGZvciBzYWZl dHkuIElmIHNvbWVkYXkgdGhhdCdzIG5vdCB0cnVlIGFueW1vcmUsCkknZCBleHBlY3Qgc29tZW9u ZSB0byB1cGRhdGUgYWxsIGV4aXN0aW5nIGRyaXZlcnMuCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5s aW51eC1mb3VuZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFp bG1hbi9saXN0aW5mby9pb21tdQ==