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Fri, 12 Nov 2021 12:47:52 +0000 Subject: Re: Questions about KMS flip To: Harry Wentland , "Kazlauskas, Nicholas" , "Yu, Lang" References: <579d0f44-bb85-11b2-d326-35a0b7c5d0de@amd.com> <5c242319-ade3-5621-6429-f77b17c34de5@amd.com> <64e70779-7c33-7849-aa29-aeaee4a89005@amd.com> <4ba7e3f8-7956-882a-6888-57e2448b907d@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: Date: Fri, 12 Nov 2021 13:47:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-ClientProxiedBy: AS9PR05CA0014.eurprd05.prod.outlook.com (2603:10a6:20b:488::33) To MWHPR1201MB0192.namprd12.prod.outlook.com (2603:10b6:301:5a::14) MIME-Version: 1.0 Received: from [IPv6:2a02:908:1252:fb60:6e65:9f86:85:5884] (2a02:908:1252:fb60:6e65:9f86:85:5884) by AS9PR05CA0014.eurprd05.prod.outlook.com (2603:10a6:20b:488::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4690.19 via Frontend Transport; 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It's _really_ nifty. > -Daniel thanks for the pointer Daniel, that framework indeed looks like it can become handy. Anyway this unfortunately turned out to be work for Harray and Nicholas. In detail it's about this bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=214621 Lang was able to reproduce the issue and narrow it down to the pin in amdgpu_display_crtc_page_flip_target(). In other words we somehow have an unbalanced pinning of the scanout buffer in DC. What should we do about that? Regards, Christian. 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Fri, 12 Nov 2021 12:47:52 +0000 Subject: Re: Questions about KMS flip To: Harry Wentland , "Kazlauskas, Nicholas" , "Yu, Lang" References: <579d0f44-bb85-11b2-d326-35a0b7c5d0de@amd.com> <5c242319-ade3-5621-6429-f77b17c34de5@amd.com> <64e70779-7c33-7849-aa29-aeaee4a89005@amd.com> <4ba7e3f8-7956-882a-6888-57e2448b907d@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: Date: Fri, 12 Nov 2021 13:47:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-ClientProxiedBy: AS9PR05CA0014.eurprd05.prod.outlook.com (2603:10a6:20b:488::33) To MWHPR1201MB0192.namprd12.prod.outlook.com (2603:10b6:301:5a::14) MIME-Version: 1.0 Received: from [IPv6:2a02:908:1252:fb60:6e65:9f86:85:5884] (2a02:908:1252:fb60:6e65:9f86:85:5884) by AS9PR05CA0014.eurprd05.prod.outlook.com (2603:10a6:20b:488::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4690.19 via Frontend Transport; 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It's _really_ nifty. > -Daniel thanks for the pointer Daniel, that framework indeed looks like it can become handy. Anyway this unfortunately turned out to be work for Harray and Nicholas. In detail it's about this bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=214621 Lang was able to reproduce the issue and narrow it down to the pin in amdgpu_display_crtc_page_flip_target(). In other words we somehow have an unbalanced pinning of the scanout buffer in DC. What should we do about that? Regards, Christian.