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Fri, 13 Nov 2020 10:43:16 +0000 Subject: Re: [PATCH v2 0/2] iommu/arm-smmu-v3: Improve cmdq lock efficiency From: John Garry To: Will Deacon References: <1598018062-175608-1-git-send-email-john.garry@huawei.com> <20200921134324.GK2139@willie-the-truck> Message-ID: Date: Fri, 13 Nov 2020 10:43:06 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.47.88.104] X-ClientProxiedBy: lhreml752-chm.china.huawei.com (10.201.108.202) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Cc: maz@kernel.org, linuxarm@huawei.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMjEvMDkvMjAyMCAxNDo1OCwgSm9obiBHYXJyeSB3cm90ZToKPiBPbiAyMS8wOS8yMDIwIDE0 OjQzLCBXaWxsIERlYWNvbiB3cm90ZToKPj4gT24gRnJpLCBBdWcgMjEsIDIwMjAgYXQgMDk6NTQ6 MjBQTSArMDgwMCwgSm9obiBHYXJyeSB3cm90ZToKPj4+IEFzIG1lbnRpb25lZCBpbiBbMF0sIHRo ZSBDUFUgbWF5IGNvbnN1bWUgbWFueSBjeWNsZXMgcHJvY2Vzc2luZwo+Pj4gYXJtX3NtbXVfY21k cV9pc3N1ZV9jbWRsaXN0KCkuIE9uZSBpc3N1ZSB3ZSBmaW5kIGlzIHRoZSBjbXB4Y2hnKCkgCj4+ PiBsb29wIHRvCj4+PiBnZXQgc3BhY2Ugb24gdGhlIHF1ZXVlIHRha2VzIGEgbG90IG9mIHRpbWUg b25jZSB3ZSBzdGFydCBnZXR0aW5nIG1hbnkKPj4+IENQVXMgY29udGVuZGluZyAtIGZyb20gZXhw ZXJpbWVudCwgZm9yIDY0IENQVXMgY29udGVuZGluZyB0aGUgY21kcSwKPj4+IHN1Y2Nlc3MgcmF0 ZSBpcyB+IDEgaW4gMTIsIHdoaWNoIGlzIHBvb3IsIGJ1dCBub3QgdG90YWxseSBhd2Z1bC4KPj4+ Cj4+PiBUaGlzIHNlcmllcyByZW1vdmVzIHRoYXQgY21weGNoZygpIGFuZCByZXBsYWNlcyB3aXRo IGFuIGF0b21pY19hZGQsCj4+PiBzYW1lIGFzIGhvdyB0aGUgYWN0dWFsIGNtZHEgZGVhbHMgd2l0 aCBtYWludGFpbmluZyB0aGUgcHJvZCBwb2ludGVyLgo+PiDCoD4gSSdtIHN0aWxsIG5vdCBhIGZh biBvZiB0aGlzLgo+IAo+IDooCj4gCj4+IENvdWxkIHlvdSB0cnkgdG8gYWRhcHQgdGhlIGhhY2tz IEkgc2VudCBiZWZvcmUsCj4+IHBsZWFzZT8gSSBrbm93IHRoZXkgd2VyZW4ndCBxdWl0ZSByaWdo dCAoSSBoYXZlIG5vIGhhcmR3YXJlIHRvIHRlc3QgCj4+IG9uKSwgYnV0Cj4+IHRoZSBiYXNpYyBp ZGVhIGlzIHRvIGZhbGwgYmFjayB0byBhIHNwaW5sb2NrIGlmIHRoZSBjbXB4Y2hnKCkgZmFpbHMu IFRoZQo+PiBxdWV1ZWluZyBpbiB0aGUgc3BpbmxvY2sgaW1wbGVtZW50YXRpb24gc2hvdWxkIGF2 b2lkIHRoZSBjb250ZW50aW9uLgo+IAo+IE9LLCBzbyBpZiB5b3UncmUgYXNraW5nIG1lIHRvIHRy eSB0aGlzIGFnYWluLCB0aGVuIEkgY2FuIGRvIHRoYXQsIGFuZCAKPiBzZWUgd2hhdCBpdCBnaXZl cyB1cy4KPiAKCkpGWUksIHRvIHByb3ZlIHRoYXQgdGhpcyBpcyBub3QgYSBwcm9ibGVtIHdoaWNo IGFmZmVjdHMgb25seSBvdXIgSFcsIEkgCm1hbmFnZWQgdG8gdGVzdCBhbiBhcm02NCBwbGF0Zm9y bSBmcm9tIGFub3RoZXIgdmVuZG9yLiBHZW5lcmFsbHkgSSBzZWUgCnRoZSBzYW1lIGlzc3VlLCBh bmQgdGhpcyBwYXRjaHNldCBhY3R1YWxseSBoZWxwcyB0aGF0IHBsYXRmb3JtIGV2ZW4gbW9yZS4K CgkJQ1BVcwlCZWZvcmUJQWZ0ZXIJJSBJbmNyZWFzZQpIdWF3ZWkgRDA2CTgJMjgySwkzMDJLCTcl Ck90aGVyCQkJMzc5Swk0MjBLCTExJQoKSHVhd2VpIEQwNgkxNgkxMTVLCTE5M0sJNjhLCk90aGVy CQkJMTAySwkyOTFLCTE4NUsKCkh1YXdlaSBEMDYJMzIJMzZLCTgwSwkxMjIlCk90aGVyCQkJNDFL CTE1NksJMjgwJQoKSHVhd2VpIEQwNgk2NAkxMUsJMzBLCTE3MiUKT3RoZXIJCQk2Swk0N0sJNjgz JQoKSSB0ZXN0ZWQgd2l0aCBzb21ldGhpbmcgbGlrZSBbMV0sIHNvIHVuaXQgaXMgbWFwK3VubWFw cyBwZXIgY3B1IHBlciAKc2Vjb25kIC0gaGlnaGVyIGlzIGJldHRlci4KCk15IEQwNiBpcyBtZW1v cnkgcG9vciwgc28gd291bGQgZXhwZWN0IGhpZ2hlciByZXN1bHRzIG90aGVyd2lzZSAod2l0aCAK bW9yZSBtZW1vcnkpLiBJbmRlZWQsIG15IEQwNSBoYXMgbWVtb3J5IG9uIGFsbCBub2RlcyBhbmQg cGVyZm9ybXMgYmV0dGVyLgoKQW55d2F5LCBJIHNlZSB0aGF0IHRoZSBpbXBsZW1lbnRhdGlvbiBo ZXJlIGlzIG5vdCBwZXJmZWN0LCBhbmQgSSBjb3VsZCAKbm90IGdldCBzdWdnZXN0ZWQgYXBwcm9h Y2ggdG8gaW1wcm92ZSBwZXJmb3JtYW5jZSBzaWduaWZpY2FudGx5LiBTbyBiYWNrIAp0byB0aGUg ZHJhd2luZyBib2FyZC4uLgoKVGhhbmtzLApKb2huCgpbMV0gCmh0dHBzOi8vbG9yZS5rZXJuZWwu b3JnL2xpbnV4LWlvbW11LzIwMjAxMTAyMDgwNjQ2LjIxODAtMS1zb25nLmJhby5odWFAaGlzaWxp Y29uLmNvbS8KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f CmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZwpodHRw czovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0aW5mby9pb21tdQ==