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Tue, 14 Apr 2020 12:08:41 +0000 From: Souvik Chakravarty To: Sudeep Holla , "guohanjun@huawei.com" Subject: RE: ACPI support for System Control and Management Interface (SCMI) Thread-Topic: ACPI support for System Control and Management Interface (SCMI) Thread-Index: AQHWEksPPwC6n0gBnkGx309F9kIg4ah4cshw Date: Tue, 14 Apr 2020 12:08:41 +0000 Message-ID: References: <52a50069-7140-b9b4-31b4-8c99e8c0d991@huawei.com> <20200414105424.GB17835@bogus> In-Reply-To: <20200414105424.GB17835@bogus> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: 1a746a8b-7b04-4745-aa11-343a8db9df43.1 x-checkrecipientchecked: true Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Souvik.Chakravarty@arm.com; x-originating-ip: [2a02:c7f:1e0e:1500:6547:6b08:f6ff:c1d8] x-ms-publictraffictype: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: b1cf6d3f-e305-4541-cf50-08d7e06c975b x-ms-traffictypediagnostic: DBBPR08MB4759:|DBBPR08MB4759:|DB6PR0801MB2007: x-ld-processed: f34e5979-57d9-4aaa-ad4d-b122a662184d,ExtAddr x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:8273;OLM:10000; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0801MB2007 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200414_050856_668876_880C1823 X-CRM114-Status: GOOD ( 15.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thanu Rangarajan , Sudeep Holla , John Garry , Linuxarm , Shameerali Kolothum Thodi , Matteo Carlini , Jonathan Cameron , "linux-arm-kernel@lists.infradead.org" , Charles Garcia-Tobin Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org > From: Sudeep Holla > Subject: Re: ACPI support for System Control and Management Interface > (SCMI) > > On Fri, Apr 10, 2020 at 10:26:41AM +0800, Hanjun Guo wrote: > > Hi Sudeep, > > > > We are working on the enablement of SCMI for Kunepeng920, which is a > > server chip using ACPI, but I didn't see the ACPI support in the > > mainline kernel for SCMI. > > > > Kunpeng920 and the upcomming Kunpeng930 have thermal sensors and > other > > system management features which needs the SCMI for abstraction layer, > > do we have plan to support ACPI for SCMI? > > > > Yes and No. > > Yes, because the same SCMI compliant firmware needs to work with ACPI as > SCMI is designed so. > > No, because we don't plan to add another SCMI layer below ACPI in the > kernel. ACPI specification was extended to support special PCC types to > support the same. IIUC things like sensors are supported using power meter > objects in ACPI and you must be able to use PCC opregion for it or any > custom mechanism to achieve that. However one need to add PCC opregion > handler in Linux. The main idea is you must use existing ACPI methods and > we don't plan to add anything special for SCMI. Additionally, if you already have an SCMI compliant firmware that uses Shared Memory based transport, it is compatible with PCC Type 3 Channels in ACPI. > > SCMI Perf protocol is compatible with CPPC. We can discuss details once you > explore PCC opregion or any alternative you come up with. I am no ACPI > firmware expert and I reckon you may have other interesting ideas. > > -- > Regards, > Sudeep IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel