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Thu, 01 Oct 2020 13:33:40 -0700 (PDT) Received: from [192.168.2.145] ([109.252.91.252]) by smtp.googlemail.com with ESMTPSA id a12sm551799ljk.109.2020.10.01.13.33.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 01 Oct 2020 13:33:39 -0700 (PDT) Subject: Re: [PATCH v3 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev To: Nicolin Chen , Thierry Reding References: <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> <20201001102316.GF3919720@ulmo> <20201001110425.GB1272@Asurada> From: Dmitry Osipenko Message-ID: Date: Thu, 1 Oct 2020 23:33:38 +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: <20201001110425.GB1272@Asurada> Content-Language: en-US Cc: linux-kernel@vger.kernel.org, krzk@kernel.org, jonathanh@nvidia.com, iommu@lists.linux-foundation.org, 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" MDEuMTAuMjAyMCAxNDowNCwgTmljb2xpbiBDaGVuINC/0LjRiNC10YI6Cj4gT24gVGh1LCBPY3Qg MDEsIDIwMjAgYXQgMTI6MjM6MTZQTSArMDIwMCwgVGhpZXJyeSBSZWRpbmcgd3JvdGU6Cj4gID4g PiA+Pj4+Pj4gSXQgbG9va3MgdG8gbWUgbGlrZSB0aGUgb25seSByZWFzb24gd2h5IHlvdSBuZWVk IHRoaXMgbmV3IGdsb2JhbCBBUEkgaXMKPj4+Pj4+Pj4+PiBiZWNhdXNlIFBDSSBkZXZpY2VzIG1h eSBub3QgaGF2ZSBhIGRldmljZSB0cmVlIG5vZGUgd2l0aCBhIHBoYW5kbGUgdG8KPj4+Pj4+Pj4+ PiB0aGUgSU9NTVUuIEhvd2V2ZXIsIFNNTVUgc3VwcG9ydCBmb3IgUENJIHdpbGwgb25seSBiZSBl bmFibGVkIGlmIHRoZQo+Pj4+Pj4+Pj4+IHJvb3QgY29tcGxleCBoYXMgYW4gaW9tbXVzIHByb3Bl cnR5LCByaWdodD8gSW4gdGhhdCBjYXNlLCBjYW4ndCB3ZQo+Pj4+Pj4+Pj4+IHNpbXBseSBkbyBz b21ldGhpbmcgbGlrZSB0aGlzOgo+Pj4+Pj4+Pj4+Cj4+Pj4+Pj4+Pj4gCWlmIChkZXZfaXNfcGNp KGRldikpCj4+Pj4+Pj4+Pj4gCQlucCA9IGZpbmRfaG9zdF9icmlkZ2UoZGV2KS0+b2Zfbm9kZTsK Pj4+Pj4+Pj4+PiAJZWxzZQo+Pj4+Pj4+Pj4+IAkJbnAgPSBkZXYtPm9mX25vZGU7Cj4gCj4+PiBJ IHBlcnNvbmFsbHkgYW0gbm90IGEgZmFuIG9mIGFkZGluZyBhIHBhdGggZm9yIFBDSSBkZXZpY2Ug ZWl0aGVyLAo+Pj4gc2luY2UgUENJL0lPTU1VIGNvcmVzIGNvdWxkIGhhdmUgdGFrZW4gY2FyZSBv ZiBpdCB3aGlsZSB0aGUgc2FtZQo+Pj4gcGF0aCBjYW4ndCBiZSB1c2VkIGZvciBvdGhlciBidXNl cy4KPj4KPj4gVGhlcmUncyBhbHJlYWR5IHBsZW50eSBvZiBvdGhlciBkcml2ZXJzIHRoYXQgZG8g c29tZXRoaW5nIHNpbWlsYXIgdG8KPj4gdGhpcy4gVGFrZSBhIGxvb2sgYXQgdGhlIGFybS1zbW11 IGRyaXZlciwgZm9yIGV4YW1wbGUsIHdoaWNoIHNlZW1zIHRvIGJlCj4+IGRvaW5nIGV4YWN0bHkg dGhlIHNhbWUgdGhpbmcgdG8gZmluZGluZyB0aGUgcmlnaHQgZGV2aWNlIHRyZWUgbm9kZSB0bwo+ PiBsb29rIGF0IChzZWUgZGV2X2dldF9kZXZfbm9kZSgpIGluIGRyaXZlcnMvaW9tbXUvYXJtLXNt bXUvYXJtLXNtbXUuYykuCj4gCj4gSG1tLi5va2F5Li50aGF0IGlzIHF1aXRlIGNvbnZpbmNpbmcg dGhlbi4uLgoKTm90IHZlcnkgY29udmluY2luZyB0byBtZS4gSSBkb24ndCBzZWUgYSAicGxlbnR5 IG9mIG90aGVyIGRyaXZlcnMiLAp0aGVyZSBpcyBvbmx5IG9uZSBhcm0tc21tdSBkcml2ZXIuCgpU aGUgZGV2X2dldF9kZXZfbm9kZSgpIGlzIHVuZGVyIENPTkZJR19BUk1fU01NVV9MRUdBQ1lfRFRf QklORElOR1MgKCEpLgpHdXlzLCBkb2Vzbid0IGl0IGxvb2sgc3RyYW5nZSB0byB5b3U/IDopCgpU aGUgYXJtLXNtbXUgZHJpdmVyIGRvZXMgYSBzaW1pbGFyIHRoaW5nIGZvciB0aGUgbW9kZXJuIGJp bmRpbmdzIHRvIHdoYXQKTmljb2xpbidzIHYzIGlzIGRvaW5nLgoKPj4+IElmIHdlIGNhbid0IGNv bWUgdG8gYW4gYWdyZWVtZW50IG9uIGdsb2JhbGl6aW5nIG1jIHBvaW50ZXIsIHdvdWxkCj4+PiBp dCBiZSBwb3NzaWJsZSB0byBwYXNzIHRlZ3JhX21jX2RyaXZlciB0aHJvdWdoIHRlZ3JhX3NtbXVf cHJvYmUoKQo+Pj4gc28gd2UgY2FuIGNvbnRpbnVlIHRvIHVzZSBkcml2ZXJfZmluZF9kZXZpY2Vf YnlfZndub2RlKCkgYXMgdjE/Cj4+Pgo+Pj4gdjE6IGh0dHBzOi8vbGttbC5vcmcvbGttbC8yMDIw LzkvMjYvNjgKPj4KPj4gdGVncmFfc21tdV9wcm9iZSgpIGFscmVhZHkgdGFrZXMgYSBzdHJ1Y3Qg dGVncmFfbWMgKi4gRGlkIHlvdSBtZWFuCj4+IHRlZ3JhX3NtbXVfcHJvYmVfZGV2aWNlKCk/IEkg ZG9uJ3QgdGhpbmsgd2UgY2FuIGRvIHRoYXQgYmVjYXVzZSBpdCBpc24ndAo+IAo+IEkgd2FzIHNh eWluZyB0byBoYXZlIGEgZ2xvYmFsIHBhcmVudF9kcml2ZXIgcG9pbnRlcjogc2ltaWxhciB0bwo+ IG15IHYxLCB5ZXQgcmF0aGVyIHRoYW4gImV4dGVybiIgdGhlIHRlZ3JhX21jX2RyaXZlciwgd2Ug cGFzcyBpdAo+IHRocm91Z2ggZWdyYV9zbW11X3Byb2JlKCkgYW5kIHN0b3JlIGl0IGluIGEgc3Rh dGljIGdsb2JhbCB2YWx1ZQo+IHNvIGFzIHRvIGNhbGwgdGVncmFfc21tdV9nZXRfYnlfZndub2Rl KCkgaW4gLT5wcm9iZV9kZXZpY2UoKS4KPiAKPiBUaG91Z2ggSSBhZ3JlZSB0aGF0IGNyZWF0aW5n IGEgZ2xvYmFsIGRldmljZSBwb2ludGVyIChtYykgbWlnaHQKPiBiZSBjb250cm92ZXJzaWFsLCB5 ZXQgaGF2aW5nIGEgZ2xvYmFsIHBhcmVudF9kcml2ZXIgcG9pbnRlciBtYXkKPiBub3QgYmUgYWdh aW5zdCB0aGUgcnVsZSwgY29uc2lkZXJpbmcgdGhhdCBpdCBpcyBjb21tb24gaW4gaW9tbXUKPiBk cml2ZXJzIHRvIGNhbGwgZHJpdmVyX2ZpbmRfZGV2aWNlX2J5X2Z3bm9kZSBpbiBwcm9iZV9kZXZp Y2UoKS4KCllvdSBkb24ndCBuZWVkIHRoZSBnbG9iYWwgcG9pbnRlciBpZiB5b3UgaGF2ZSBTTU1V IE9GIG5vZGUuCgpZb3UgY291bGQgYWxzbyBnZXQgZHJpdmVyIHBvaW50ZXIgZnJvbSBtYy0+ZGV2 LT5kcml2ZXIuCgpCdXQgSSBkb24ndCB0aGluayB5b3UgbmVlZCB0byBkbyB0aGlzIGF0IGFsbC4g VGhlIHByb2JlX2RldmljZSgpIGNvdWxkCmJlIGludm9rZWQgb25seSBmb3IgdGhlIHRlZ3JhX3Nt bXVfb3BzIGFuZCB0aGVuIHNlZW1zIHlvdSBjb3VsZCB1c2UKZGV2X2lvbW11X3ByaXZfc2V0KCkg aW4gdGVncmFfc21tdV9vZl94bGF0ZSgpLCBsaWtlIHN1bjUwaS1pb21tdSBkcml2ZXIKZG9lcy4K X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUgbWFp bGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMu bGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11