From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 053F017D378; Fri, 18 Oct 2024 10:05:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729245929; cv=none; b=Oe5qoSpi/NKt0FX14iBTsS/2ysggFrYkSJjtsWWZYIqLuEgqWsn/DUxJUm1ayyTNoWFXI1YtreULoP//DaR8EXOM/TR6dGcpdfHy30jqrj8WfIGQ1mTbXoCXZXdv9nvennlGflUJus8VKhaNP7CzeXKs2Pw2V+J+G8WV4rzPXPM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729245929; c=relaxed/simple; bh=KEGDJMN6eddDhPQD2ltJfuTnJIsAoHWrXDgEUWs0Ewk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=upQ7zM+zM4BJkosl0b/QJhrUyySqmGoQNi50YVTOk5B/+tVx1ITZKFtEby0OdLivC6ePdwOft8KveoF1HNQ1u2grRg8ZYvq/C8+Yl0rktnMNORRK4Evm9vljT3VEAQMhCnfZs6cceDD8jNlqz908vIRrd+gJATqD7jxtMd3IGKw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=az2zBBGE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="az2zBBGE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5CFDC4CEC3; Fri, 18 Oct 2024 10:05:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729245928; bh=KEGDJMN6eddDhPQD2ltJfuTnJIsAoHWrXDgEUWs0Ewk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=az2zBBGEMLy8XxYkz+tBw2ZrQxov9h3SOrgKdd1loU4Csrdj+aGrSczC3V6+8psF9 I0xMB9qXhz8RyrPxEd5BVgYK2CChL19uoQzmIQkJIO8fqff5n5lF7Ulb6nJDE656uP B2kn60tQV8bjclG9vm/MFH+2wVowE60ekuhumx89PzFuh4IUoB+TyT4nzCfZXshsTD I2ke6Wtffqm/RPxp5vSub0gn8WxsQI49ENeEV+VbzmRvf4uY27y9NvuF3je2MCYmlt 3pJnnyK/hrJUbIHcBkJ9nMOYewUEdXmuV1Zrj+YS29oqV2bCPsuyJWl+rb9L6Ik7eg JhjEW1qordlOA== Message-ID: Date: Fri, 18 Oct 2024 12:05:20 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] dt-bindings: arm: qcom,coresight-static-replicator: Add property for source filtering To: Tao Zhang , Suzuki K Poulose Cc: Mike Leach , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mathieu Poirier , Leo Yan , Alexander Shishkin , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20240821031348.6837-1-quic_taozha@quicinc.com> <20240821031348.6837-2-quic_taozha@quicinc.com> <44e2617c-62b0-436f-ac6a-0bd3e3855473@arm.com> <53ec46af-3438-44e0-82b2-9432fc7f0fcb@arm.com> <4a6066ed-ead4-4387-8c66-b3e7631c5e90@arm.com> <6e408062-9a74-4a2a-8b67-b83244c4ca95@quicinc.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 17/10/2024 09:23, Tao Zhang wrote: > > On 10/9/2024 6:52 PM, Suzuki K Poulose wrote: >> Krzysztof >> >> On 22/08/2024 12:50, Suzuki K Poulose wrote: >>> On 22/08/2024 11:34, Suzuki K Poulose wrote: >>>> On 22/08/2024 08:08, Krzysztof Kozlowski wrote: >>>>> On Wed, Aug 21, 2024 at 11:38:55AM +0100, Suzuki K Poulose wrote: >>>>>> On 21/08/2024 04:13, Tao Zhang wrote: >>>>>>> The is some "magic" hard coded filtering in the replicators, >>>>>>> which only passes through trace from a particular "source". Add >>>>>>> a new property "filter-src" to label a phandle to the coresight >>>>>>> trace source device matching the hard coded filtering for the port. >>>>>> >>>>>> Minor nit: Please do not use abbreviate "source" in the bindings. >>>>>> I am not an expert on other changes below and will leave it to >>>>>> Rob/Krzysztof to comment. >>>>>> >>>>>> Rob, Krzysztof, >>>>>> >>>>>> We need someway to "link" (add a phandle) from a "port". The patch >>>>>> below >>>>>> is extending "standard" port to add a phandle. Please let us know if >>>>>> there is a better way. >>>>>> >>>>>> e.g.: >>>>>> >>>>>> filters = list of tuples of port, phandle. ? >>>>>> >>>>>> e.g.: >>>>>> >>>>>> filters = < 0, <&tpdm_video>, >>>>>>              1, <&tpdm_mdss> >>>>>>        > >>>>>> >>>>> >>>>> Current solution feels like band-aid - what if next time you need some >>>>> second filter? Or "wall"? Or whatever? Next property? >>>> >>>> >>>> >>>>> >>>>> Isn't filter just one endpoint in the graph? >>>>> >>>>> A <--> filter <--> B >>>> >>>> To be more precise, "Filter" is a "port (p0, p1, p2 below)" (among a >>>> multi output ports). >>>> >>>> For clearer example: >>>> >>>> A0 <--> .. <--> ..\                  p0  / --> Filtered for (A1) >>>> <--> B1 >>>> A1 <--> .. <--> .. - < L(filters>    p1  - --> Filtered for (A2) >>>> <--> B2 >>>> A2 <--> .. <--> ../                  p2  \ --> Unfiltered        >>>> <--> B0 >>>> >>>> >>>> >>>>> Instead of >>>>> >>>>> A <----through-filter----> B? >>>> >>>> The problem is we need to know the components in the path from A0 to X >>>> through, (Not just A0 and L). And also we need to know "which port >>>> (p0 vs p1 vs p2)" does the traffic take from a source (A0/A1/A2) out >>>> of the >>>> link "L". >>>> >>>> So ideally, we need a way to tie p0 -> A1, p1 -> A2. >>>> >>>> would we need something else in the future ? I don't know for sure. >>>> People could design their own things ;-). But this was the first time >>>> ever in the last 12yrs since we supported coresight in the kernel. >>>> (there is always a first time). >>>> >>>> Fundamentally, the "ports" cannot have additional properties today. >>>> Not sure if there are other usecases (I don't see why). So, we have >>>> to manually extend like above, which I think is not nice. >>> >>> Replying to the other thread [0], made me realize that the above is not >>> true. Indeed it is possible to add properties for endpoints, e.g: >>> >>> e.g.: media/video-interfaces.yaml >>> >>> So extending the endpoint node is indeed acceptable (unlike I thought). >>> May be the we it is achieved in this patch is making it look otherwise. >>> >>> Suzuki >>> [0] >>> https://lkml.kernel.org/r/4b51d5a9-3706-4630-83c1-01b01354d9a4@arm.com >> >> Please could you let us know if it is acceptable to extend "endpoint" >> node to have an optional property ? > > Hi Krzysztof, > > > Kindly reminder, could you help comment on this? I don't have any smart ideas and with earlier explanation sounds ok. Best regards, Krzysztof