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Tue, 19 Apr 2022 00:20:27 -0700 (PDT) Message-ID: <7f693a3a-bbab-237a-af9a-4395e501a5b2@arm.com> Date: Tue, 19 Apr 2022 08:20:22 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH 02/13] iommu: Move bus setup to IOMMU device registration Content-Language: en-GB To: Lu Baolu , joro@8bytes.org, will@kernel.org References: <1d9a2146-9e48-ba97-d049-5d2332ebbd3a@arm.com> From: Robin Murphy In-Reply-To: Cc: jean-philippe@linaro.org, zhang.lyra@gmail.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, thierry.reding@gmail.com, linux-arm-kernel@lists.infradead.org, gerald.schaefer@linux.ibm.com 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMjAyMi0wNC0xOSAwMDozNywgTHUgQmFvbHUgd3JvdGU6Cj4gT24gMjAyMi80LzE5IDY6MDks IFJvYmluIE11cnBoeSB3cm90ZToKPj4gT24gMjAyMi0wNC0xNiAwMTowNCwgTHUgQmFvbHUgd3Jv dGU6Cj4+PiBPbiAyMDIyLzQvMTQgMjA6NDIsIFJvYmluIE11cnBoeSB3cm90ZToKPj4+PiBAQCAt MTg4MywyNyArMTkwMCwxMiBAQCBzdGF0aWMgaW50IGlvbW11X2J1c19pbml0KHN0cnVjdCBidXNf dHlwZSAqYnVzKQo+Pj4+IMKgwqAgKi8KPj4+PiDCoCBpbnQgYnVzX3NldF9pb21tdShzdHJ1Y3Qg YnVzX3R5cGUgKmJ1cywgY29uc3Qgc3RydWN0IGlvbW11X29wcyAqb3BzKQo+Pj4+IMKgIHsKPj4+ PiAtwqDCoMKgIGludCBlcnI7Cj4+Pj4gLQo+Pj4+IC3CoMKgwqAgaWYgKG9wcyA9PSBOVUxMKSB7 Cj4+Pj4gLcKgwqDCoMKgwqDCoMKgIGJ1cy0+aW9tbXVfb3BzID0gTlVMTDsKPj4+PiAtwqDCoMKg wqDCoMKgwqAgcmV0dXJuIDA7Cj4+Pj4gLcKgwqDCoCB9Cj4+Pj4gLQo+Pj4+IC3CoMKgwqAgaWYg KGJ1cy0+aW9tbXVfb3BzICE9IE5VTEwpCj4+Pj4gK8KgwqDCoCBpZiAoYnVzLT5pb21tdV9vcHMg JiYgb3BzICYmIGJ1cy0+aW9tbXVfb3BzICE9IG9wcykKPj4+PiDCoMKgwqDCoMKgwqDCoMKgwqAg cmV0dXJuIC1FQlVTWTsKPj4+PiDCoMKgwqDCoMKgIGJ1cy0+aW9tbXVfb3BzID0gb3BzOwo+Pj4K Pj4+IERvIHdlIHN0aWxsIG5lZWQgdG8ga2VlcCBhYm92ZSBsaW5lcyBpbiBidXNfc2V0X2lvbW11 KCk/Cj4+Cj4+IEl0IHByZXNlcnZlcyB0aGUgZXhpc3RpbmcgYmVoYXZpb3VyIHVudGlsIGVhY2gg Y2FsbHNpdGUgYW5kIGl0cyAKPj4gYXNzb2NpYXRlZCBlcnJvciBoYW5kbGluZyBhcmUgcmVtb3Zl ZCBsYXRlciBvbiwgd2hpY2ggc2VlbXMgbGlrZSBhcyAKPj4gZ29vZCBhIHRoaW5nIHRvIGRvIGFz IGFueS4gU2luY2UgSSdtIGFscmVhZHkgcmVsYXhpbmcgCj4+IGlvbW11X2RldmljZV9yZWdpc3Rl cigpIHRvIGEgd2Fybi1idXQtY29udGludWUgYmVoYXZpb3VyIHdoaWxlIGl0IAo+PiBrZWVwcyB0 aGUgYnVzIG9wcyBvbiBsaWZlLXN1cHBvcnQgaW50ZXJuYWxseSwgSSBmaWd1cmVkIG5vdCBjaGFu Z2luZyAKPj4gdG9vIG11Y2ggYXQgb25jZSB3b3VsZCBtYWtlIGl0IGVhc2llciB0byBiaXNlY3Qg YW55IHBvdGVudGlhbCBpc3N1ZXMgCj4+IGFyaXNpbmcgZnJvbSB0aGlzIGZpcnN0IHN0ZXAuCj4g Cj4gRmFpciBlbm91Z2guIFRoYW5rIHlvdSBmb3IgdGhlIGV4cGxhbmF0aW9uLgo+IAo+IERvIHlv dSBoYXZlIGEgcHVibGljIHRyZWUgdGhhdCBJIGNvdWxkIHB1bGwgdGhlc2UgcGF0Y2hlcyBhbmQg dHJ5IHRoZW0KPiBvbiBhbiBJbnRlbCBoYXJkd2FyZT8gT3IgcGVyaGFwcyB5b3UgaGF2ZSBkb25l IHRoaXM/IEkgbGlrZSB0aGUgd2hvbGUKPiBpZGVhIG9mIHRoaXMgc2VyaWVzLCBidXQgaXQncyBi ZXR0ZXIgdG8gdHJ5IGl0IHdpdGggYSByZWFsIGhhcmR3YXJlLgoKSSBoYXZlbid0IGJvdGhlcmVk IHdpdGggc2VwYXJhdGUgYnJhbmNoZXMgc2luY2UgdGhlcmUncyBzbyBtYW55IApkaWZmZXJlbnQg cGllY2VzIGluLWZsaWdodCwgYnV0IG15IGNvbXBsZXRlICh1bnN0YWJsZSkgZGV2ZWxvcG1lbnQg CmJyYW5jaCBjYW4gYmUgZm91bmQgaGVyZToKCmh0dHBzOi8vZ2l0bGFiLmFybS5jb20vbGludXgt YXJtL2xpbnV4LXJtLy0vY29tbWl0cy9pb21tdS9idXMKCkZvciBub3cgSSdkIHJlY29tbWVuZCB3 aW5kaW5nIHRoZSBoZWFkIGJhY2sgdG8gImlvbW11OiBDbGVhbiB1cCAKYnVzX3NldF9pb21tdSgp IiBmb3IgdGVzdGluZyAtIHNvbWUgb2YgdGhlIHBhdGNoZXMgYWJvdmUgdGhhdCBoYXZlIAphbHJl YWR5IGJlZW4gcG9zdGVkIGFuZCBwaWNrZWQgdXAgYnkgdGhlaXIgcmVzcGVjdGl2ZSBzdWJzeXN0 ZW1zLCBidXQgCm90aGVycyBhcmUgaW5jb21wbGV0ZSBhbmQgYmFyZWx5IGNvbXBpbGUtdGVzdGVk LiBJJ2xsIHByb2JhYmx5IHJlYXJyYW5nZSAKaXQgbGF0ZXIgdGhpcyB3ZWVrIHRvIGJldHRlciBy ZWZsZWN0IHdoYXQncyBoYXBwZW5lZCBzbyBmYXIuCgpDaGVlcnMsClJvYmluLgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwppb21tdSBtYWlsaW5nIGxpc3QK aW9tbXVAbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5k YXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vaW9tbXU=