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Wed, 30 Sep 2020 21:05:00 -0700 (PDT) Subject: Re: [PATCH v3 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev To: Nicolin Chen References: <20200930084258.25493-1-nicoleotsuka@gmail.com> <20200930084258.25493-3-nicoleotsuka@gmail.com> <20200930153131.GB3833404@ulmo> <20200930203618.GC2110@Asurada-Nvidia> <13746922-0253-cda7-e9ac-2bd20bf1a17f@gmail.com> <20200930213244.GA10573@Asurada-Nvidia> <5945a63e-79d8-e3ae-ab53-cee8c220ac7d@gmail.com> <20201001012630.GA28240@Asurada-Nvidia> <72b11925-5857-8ce5-d084-cab01ca1b396@gmail.com> <20201001024850.GA28456@Asurada-Nvidia> From: Dmitry Osipenko Message-ID: Date: Thu, 1 Oct 2020 07:04:59 +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: <20201001024850.GA28456@Asurada-Nvidia> Content-Language: en-US Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, krzk@kernel.org, jonathanh@nvidia.com, Thierry Reding , 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" MDEuMTAuMjAyMCAwNTo0OCwgTmljb2xpbiBDaGVuINC/0LjRiNC10YI6Cj4gT24gVGh1LCBPY3Qg MDEsIDIwMjAgYXQgMDU6MDY6MTlBTSArMDMwMCwgRG1pdHJ5IE9zaXBlbmtvIHdyb3RlOgo+PiAw MS4xMC4yMDIwIDA0OjI2LCBOaWNvbGluIENoZW4g0L/QuNGI0LXRgjoKPj4+IE9uIFRodSwgT2N0 IDAxLCAyMDIwIGF0IDEyOjU2OjQ2QU0gKzAzMDAsIERtaXRyeSBPc2lwZW5rbyB3cm90ZToKPj4+ PiAwMS4xMC4yMDIwIDAwOjMyLCBOaWNvbGluIENoZW4g0L/QuNGI0LXRgjoKPj4+Pj4gT24gVGh1 LCBPY3QgMDEsIDIwMjAgYXQgMTI6MjQ6MjVBTSArMDMwMCwgRG1pdHJ5IE9zaXBlbmtvIHdyb3Rl Ogo+Pj4+Pj4gLi4uCj4+Pj4+Pj4+IEl0IGxvb2tzIHRvIG1lIGxpa2UgdGhlIG9ubHkgcmVhc29u IHdoeSB5b3UgbmVlZCB0aGlzIG5ldyBnbG9iYWwgQVBJIGlzCj4+Pj4+Pj4+IGJlY2F1c2UgUENJ IGRldmljZXMgbWF5IG5vdCBoYXZlIGEgZGV2aWNlIHRyZWUgbm9kZSB3aXRoIGEgcGhhbmRsZSB0 bwo+Pj4+Pj4+PiB0aGUgSU9NTVUuIEhvd2V2ZXIsIFNNTVUgc3VwcG9ydCBmb3IgUENJIHdpbGwg b25seSBiZSBlbmFibGVkIGlmIHRoZQo+Pj4+Pj4+PiByb290IGNvbXBsZXggaGFzIGFuIGlvbW11 cyBwcm9wZXJ0eSwgcmlnaHQ/IEluIHRoYXQgY2FzZSwgY2FuJ3Qgd2UKPj4+Pj4+Pj4gc2ltcGx5 IGRvIHNvbWV0aGluZyBsaWtlIHRoaXM6Cj4+Pj4+Pj4+Cj4+Pj4+Pj4+IAlpZiAoZGV2X2lzX3Bj aShkZXYpKQo+Pj4+Pj4+PiAJCW5wID0gZmluZF9ob3N0X2JyaWRnZShkZXYpLT5vZl9ub2RlOwo+ Pj4+Pj4+PiAJZWxzZQo+Pj4+Pj4+PiAJCW5wID0gZGV2LT5vZl9ub2RlOwo+Pj4+Pj4+Pgo+Pj4+ Pj4+PiA/IEknbSBub3Qgc3VyZSBleGFjdGx5IHdoYXQgZmluZF9ob3N0X2JyaWRnZSgpIGlzIGNh bGxlZCwgYnV0IEknbSBwcmV0dHkKPj4+Pj4+Pj4gc3VyZSB0aGF0IGV4aXN0cy4KPj4+Pj4+Pj4K Pj4+Pj4+Pj4gT25jZSB3ZSBoYXZlIHRoYXQgd2UgY2FuIHN0aWxsIGl0ZXJhdGUgb3ZlciB0aGUg aW9tbXVzIHByb3BlcnR5IGFuZCBkbwo+Pj4+Pj4+PiBub3QgbmVlZCB0byByZWx5IG9uIHRoaXMg Z2xvYmFsIHZhcmlhYmxlLgo+Pj4+Pj4+Cj4+Pj4+Pj4gSSBhZ3JlZSB0aGF0IGl0J2Qgd29yay4g QnV0IEkgd2FzIGhvcGluZyB0byBzaW1wbGlmeSB0aGUgY29kZQo+Pj4+Pj4+IGhlcmUgaWYgaXQn cyBwb3NzaWJsZS4gTG9va3MgbGlrZSB3ZSBoYXZlIGFuIGFyZ3VtZW50IG9uIHRoaXMKPj4+Pj4+ PiBzbyBJIHdpbGwgY2hvb3NlIHRvIGdvIHdpdGggeW91ciBzdWdnZXN0aW9uIGFib3ZlIGZvciBu b3cuCj4+Pj4+Pgo+Pj4+Pj4gVGhpcyBwYXRjaCByZW1vdmVkIG1vcmUgbGluZXMgdGhhbiB3ZXJl IGFkZGVkLiBJZiB0aGlzIHdpbGwgYmUgb3Bwb3NpdGUKPj4+Pj4+IGZvciB0aGUgVGhpZXJyeSdz IHN1Z2dlc3Rpb24sIHRoZW4gaXQncyBwcm9iYWJseSBub3QgYSBncmVhdCBzdWdnZXN0aW9uLgo+ Pj4+Pgo+Pj4+PiBTb3JyeSwgSSBkb24ndCBxdWl0ZSB1bmRlcnN0YW5kIHRoaXMgY29tbWVudHMu IFdvdWxkIHlvdSBwbGVhc2UKPj4+Pj4gZWxhYm9yYXRlIHdoYXQncyB0aGlzICJpdCIgYmVpbmcg Im5vdCBhIGdyZWF0IHN1Z2dlc3Rpb24iPwo+Pj4+Pgo+Pj4+Cj4+Pj4gSSBtZWFudCB0aGF0IHlv dSBzaG91bGQgdHJ5IHRvIGltcGxlbWVudCBUaGllcnJ5J3Mgc29sdXRpb24sIGJ1dCBpZiB0aGUK Pj4+PiBlbmQgcmVzdWx0IHdpbGwgYmUgd29yc2UgdGhhbiB0aGUgY3VycmVudCBwYXRjaCwgdGhl biB5b3Ugc2hvdWxkbid0IG1ha2UKPj4+PiBhIHY0LCBidXQgZ2V0IGJhY2sgdG8gdGhpcyBkaXNj dXNzaW9uIGluIG9yZGVyIHRvIGNob29zZSB0aGUgYmVzdCBvcHRpb24KPj4+PiBhbmQgbWFrZSBl dmVyeW9uZSBhZ3JlZSBvbiBpdC4KPj4+Cj4+PiBJIHNlZS4gVGhhbmtzIGZvciB0aGUgcmVwbHku IEFuZCBoZXJlIGlzIGEgc2FtcGxlIGltcGxlbWVudGF0aW9uOgo+Pgo+PiBUaGF0J3Mgd2hhdCBJ IHN1cHBvc2VkIHRvIGhhcHBlbiA6KSBUaGUgbmV3IHZhcmlhbnQgYWRkcyBjb2RlIGFuZAo+PiBj b21wbGV4aXR5LCB3aGlsZSBvbGQgZGlkIHRoZSBvcHBvc2l0ZS4gSGVuY2UgdGhlIG9sZCB2YXJp YW50IGlzIGNsZWFybHkKPj4gbW9yZSBhdHRyYWN0aXZlLCBJTU8uCj4gCj4gSSBwZXJzb25hbGx5 IGFtIG5vdCBhIGZhbiBvZiBhZGRpbmcgYSBwYXRoIGZvciBQQ0kgZGV2aWNlIGVpdGhlciwKPiBz aW5jZSBQQ0kvSU9NTVUgY29yZXMgY291bGQgaGF2ZSB0YWtlbiBjYXJlIG9mIGl0IHdoaWxlIHRo ZSBzYW1lCj4gcGF0aCBjYW4ndCBiZSB1c2VkIGZvciBvdGhlciBidXNlcy4KPiAKPiBJZiB3ZSBj YW4ndCBjb21lIHRvIGFuIGFncmVlbWVudCBvbiBnbG9iYWxpemluZyBtYyBwb2ludGVyLCB3b3Vs ZAo+IGl0IGJlIHBvc3NpYmxlIHRvIHBhc3MgdGVncmFfbWNfZHJpdmVyIHRocm91Z2ggdGVncmFf c21tdV9wcm9iZSgpCj4gc28gd2UgY2FuIGNvbnRpbnVlIHRvIHVzZSBkcml2ZXJfZmluZF9kZXZp Y2VfYnlfZndub2RlKCkgYXMgdjE/Cj4gCj4gdjE6IGh0dHBzOi8vbGttbC5vcmcvbGttbC8yMDIw LzkvMjYvNjgKPiAKCkkgdGhpbmsgd2UgYWxyZWFkeSBhZ3JlZWQgdGhhdCBpdCB3aWxsIGJlIGdv b2QgdG8gaGF2ZSBhIGNvbW1vbiBoZWxwZXIuClNvIGZhciBUaGllcnJ5IG9ubHkgb2JqZWN0ZWQg dGhhdCB0aGUgaW1wbGVtZW50YXRpb24gb2YgdGhlIGhlbHBlciBjb3VsZApiZSBpbXByb3ZlZC4K X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUgbWFp bGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMu bGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11