From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E5FA010ED674 for ; Fri, 27 Mar 2026 13:56:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JhTgsYOCl/Jd+QtqfoV8nsUIFXQaywMSO9kzKIC7jYU=; b=vyJrGEXCSQCHuLkdQjS2UsG4ca QMfTWyDet6TkeyBK8msICvqWS+oXabckklU7LYO7AmeQIIFoaS9UTTLKnAkM9Owal5baIC7QG2iRj RP//QkeAQEOpKPxUvGYbJYEFz4L7awQ1O6xsGaIgyIf62dOJJ9CAw8XZVIk+kBWeEkHy8ZfRyTeVQ TKMj+V90NNtxQy+y4XwcD3QGjl1fTAWUqPqFaciUXMFkdkbUIsH1qeg0HQ+ArMy7AiRvyr46XljJ3 NLGUfhIckkE+qCFo2WolgyiMZqrtp92WpRsQOY4Kn+4w3bb7HXBd6kfpcTTsSDaXWy9f/E3Qtu3v/ OY7iG35w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w67gE-00000007Uft-2V5J; Fri, 27 Mar 2026 13:56:54 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w67gC-00000007UfD-3KAX for ath12k@lists.infradead.org; Fri, 27 Mar 2026 13:56:53 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 340F9417AF; Fri, 27 Mar 2026 13:56:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B11FC19423; Fri, 27 Mar 2026 13:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774619812; bh=2mf5n3dc77+mCuOXdxbyc2GEf2Wtigj7YNJ+nHFL1Tc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=gqlqCI1lFYA8l0v9f7x7r+LuraTcOCrQCqsWXfQHxTliO9u0H6NRLTSwt1PJrc2dI JzSZ7Qx97LFgd5pw5IJYTs9HohcIs9z82W9PtTLStFdtcUBXA44LYWIFEw60xB93WB Xg1IQEwKTbluRJYw21AaOQI+uhUaTx2JA6iR2D5CwyM/5WzR+pdQffXUb2sZ178cEq JkU6r4X0hjI9M0GspIsHMZJwg+EJ62Q6laoD1llzD4fcACEH/YX7yGNYJRlqPqM43D XD8AsQg4ziDw+uksS36u5xCr92h7VrFduN9+tqSK9sn1n4iTtLi7cQ+RzP7dPLige/ 0wMltjEFiAeqA== Message-ID: Date: Fri, 27 Mar 2026 14:56:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/15] firmware: qcom: Add a generic PAS service To: Konrad Dybcio , Sumit Garg Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-media@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, ath12k@lists.infradead.org, linux-remoteproc@vger.kernel.org, andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, robin.clark@oss.qualcomm.com, sean@poorly.run, akhilpo@oss.qualcomm.com, lumag@kernel.org, abhinav.kumar@linux.dev, jesszhan0024@gmail.com, marijn.suijten@somainline.org, airlied@gmail.com, simona@ffwll.ch, vikash.garodia@oss.qualcomm.com, dikshita.agarwal@oss.qualcomm.com, bod@kernel.org, mchehab@kernel.org, elder@kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jjohnson@kernel.org, mathieu.poirier@linaro.org, trilokkumar.soni@oss.qualcomm.com, mukesh.ojha@oss.qualcomm.com, pavan.kondeti@oss.qualcomm.com, jorge.ramirez@oss.qualcomm.com, tonyh@qti.qualcomm.com, vignesh.viswanathan@oss.qualcomm.com, srinivas.kandagatla@oss.qualcomm.com, amirreza.zarrabi@oss.qualcomm.com, jens.wiklander@linaro.org, op-tee@lists.trustedfirmware.org, apurupa@qti.qualcomm.com, skare@qti.qualcomm.com, linux-kernel@vger.kernel.org, Sumit Garg References: <20260312062756.694390-1-sumit.garg@kernel.org> <20260312062756.694390-3-sumit.garg@kernel.org> <28d63822-f191-400a-8005-5185dd480dbb@kernel.org> <5c5b49aa-7819-44c6-b5f7-19ec780d73fa@kernel.org> <2e55bdc3-54a1-4f18-b9ad-fe03f21fc4da@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260327_065652_871863_414DC9B8 X-CRM114-Status: GOOD ( 11.74 ) X-BeenThere: ath12k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath12k" Errors-To: ath12k-bounces+ath12k=archiver.kernel.org@lists.infradead.org On 23/03/2026 15:26, Konrad Dybcio wrote: >>> >>> This pattern has been carried from the PAS API contract among kernel >>> clients and the SCM PAS service earlier. The clients don't hold a >>> reference to the PAS data like underlying platform or TEE device etc. >>> Hence the need to have a global data pointer to hold reference to the >>> ops data structure registered by drivers having different lifetime of >>> devices. Also, the PAS APIs can be called from very different client >>> driver contexts. >>> >>> Surely, avoiding global data is always better given a better alternative >>> is there. Do you have any better alternative proposal here? >> >> Why it cannot be part of the context? >> >> Look at your API, e.g.: >> qcom_pas_init_image(). It takes struct qcom_pas_context which should >> contain the ops. > > This would make the client have to select the ops. The whole point is to > avoid that, since the client has no clue (and is supposed not to have any). Yeah, I see. The problem is that this patchset just keeps growing the singletons so except existing 'struct qcom_scm *__scm' in qcom_scm.c, this one brings at least three new: 'ops_ptr', 'qcom_pas_ops_scm' and 'qcom_pas_ops_tee'. I don't think you need all four in total, but only one which will hold whatever pointers are necessary. Best regards, Krzysztof From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.trustedfirmware.org (lists.trustedfirmware.org [18.214.241.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4122010ED674 for ; Fri, 27 Mar 2026 13:57:01 +0000 (UTC) Received: from lists.trustedfirmware.org (localhost [127.0.0.1]) by lists.trustedfirmware.org (Postfix) with ESMTP id 6F80144488 for ; Fri, 27 Mar 2026 13:57:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.trustedfirmware.org; s=2024; t=1774619820; bh=2mf5n3dc77+mCuOXdxbyc2GEf2Wtigj7YNJ+nHFL1Tc=; h=Date:Subject:To:References:In-Reply-To:CC:List-Id:List-Archive: List-Help:List-Owner:List-Post:List-Subscribe:List-Unsubscribe: From:Reply-To:From; b=3EVAx+IVAYF0MomKmfdxKLSWANB63du73X7M4DtoRYKz+VP3/Ekb+NHynHnDg1Glt z2jmmvWn4OIMOQX322DLw7crAYT2+aUcHlpgyO+aQn1vJmG6WEPWIi0jFhcsHW4PCI BvflqYdYy017lCoiaVXnTxc9JPdjr2AQ7gqL65Jw6IwznYg9/me2miH02+J3A8PHkx glaGVGmiF+epFyZa3D88d7iR2qmFr40+ciGCZBHCZ+1hJiduPpAy7YHAVVyMKWAw2e pMqg0ibggTJEDNPBtI93OVB2qzEPNUxRgoyIyc5Y8Fdgz4Q58u9SLY39IYUTNZCi4h 2uphczT3CVSXg== Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by lists.trustedfirmware.org (Postfix) with ESMTPS id D557F43AA2 for ; Fri, 27 Mar 2026 13:56:52 +0000 (UTC) Authentication-Results: lists.trustedfirmware.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=gqlqCI1l; dkim-atps=neutral Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 340F9417AF; Fri, 27 Mar 2026 13:56:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B11FC19423; Fri, 27 Mar 2026 13:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774619812; bh=2mf5n3dc77+mCuOXdxbyc2GEf2Wtigj7YNJ+nHFL1Tc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=gqlqCI1lFYA8l0v9f7x7r+LuraTcOCrQCqsWXfQHxTliO9u0H6NRLTSwt1PJrc2dI JzSZ7Qx97LFgd5pw5IJYTs9HohcIs9z82W9PtTLStFdtcUBXA44LYWIFEw60xB93WB Xg1IQEwKTbluRJYw21AaOQI+uhUaTx2JA6iR2D5CwyM/5WzR+pdQffXUb2sZ178cEq JkU6r4X0hjI9M0GspIsHMZJwg+EJ62Q6laoD1llzD4fcACEH/YX7yGNYJRlqPqM43D XD8AsQg4ziDw+uksS36u5xCr92h7VrFduN9+tqSK9sn1n4iTtLi7cQ+RzP7dPLige/ 0wMltjEFiAeqA== Message-ID: Date: Fri, 27 Mar 2026 14:56:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/15] firmware: qcom: Add a generic PAS service To: Konrad Dybcio , Sumit Garg References: <20260312062756.694390-1-sumit.garg@kernel.org> <20260312062756.694390-3-sumit.garg@kernel.org> <28d63822-f191-400a-8005-5185dd480dbb@kernel.org> <5c5b49aa-7819-44c6-b5f7-19ec780d73fa@kernel.org> <2e55bdc3-54a1-4f18-b9ad-fe03f21fc4da@oss.qualcomm.com> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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DKIM_TRACE(0.00)[kernel.org:+] X-Rspamd-Server: lists.trustedfirmware.org X-Rspamd-Queue-Id: D557F43AA2 X-Spamd-Bar: --- Message-ID-Hash: 2AJDCIAZHBJCVNBKDVNSQ3UNFMU4OHEO X-Message-ID-Hash: 2AJDCIAZHBJCVNBKDVNSQ3UNFMU4OHEO X-MailFrom: krzk@kernel.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-op-tee.lists.trustedfirmware.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-media@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, ath12k@lists.infradead.org, linux-remoteproc@vger.kernel.org, andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, robin.clark@oss.qualcomm.com, sean@poorly.run, akhilpo@oss.qualcomm.com, lumag@kernel.org, abhinav.kumar@linux.dev, jesszhan0024@gmail.com, marijn.suijten@somainline.org, airlied@gmail.com, simona@ffwll.ch, vikash.garodia@oss.qualcomm.com, dikshita.agarwal@oss.qualcomm.com, bod@kernel.org, mchehab@kernel.org, elder@kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jjohnson@kernel.org, mathieu.poirier@linaro.org, trilokkumar.soni@oss.qualcomm.com, mukesh.ojha@oss.qualcomm.com, pavan.kondeti@oss.qualcomm.com, jorge.ramirez@oss.qualcomm.com, tonyh@qti. qualcomm.com, vignesh.viswanathan@oss.qualcomm.com, srinivas.kandagatla@oss.qualcomm.com, amirreza.zarrabi@oss.qualcomm.com, op-tee@lists.trustedfirmware.org, apurupa@qti.qualcomm.com, skare@qti.qualcomm.com, linux-kernel@vger.kernel.org, Sumit Garg X-Mailman-Version: 3.3.5 Precedence: list List-Id: Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Krzysztof Kozlowski via OP-TEE Reply-To: Krzysztof Kozlowski On 23/03/2026 15:26, Konrad Dybcio wrote: >>> >>> This pattern has been carried from the PAS API contract among kernel >>> clients and the SCM PAS service earlier. The clients don't hold a >>> reference to the PAS data like underlying platform or TEE device etc. >>> Hence the need to have a global data pointer to hold reference to the >>> ops data structure registered by drivers having different lifetime of >>> devices. Also, the PAS APIs can be called from very different client >>> driver contexts. >>> >>> Surely, avoiding global data is always better given a better alternative >>> is there. Do you have any better alternative proposal here? >> >> Why it cannot be part of the context? >> >> Look at your API, e.g.: >> qcom_pas_init_image(). It takes struct qcom_pas_context which should >> contain the ops. > > This would make the client have to select the ops. The whole point is to > avoid that, since the client has no clue (and is supposed not to have any). Yeah, I see. The problem is that this patchset just keeps growing the singletons so except existing 'struct qcom_scm *__scm' in qcom_scm.c, this one brings at least three new: 'ops_ptr', 'qcom_pas_ops_scm' and 'qcom_pas_ops_tee'. I don't think you need all four in total, but only one which will hold whatever pointers are necessary. Best regards, Krzysztof