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Thu, 25 Mar 2021 07:40:14 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id E7FCBC43464; Thu, 25 Mar 2021 07:40:13 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id DB834C433C6; Thu, 25 Mar 2021 07:40:12 +0000 (UTC) MIME-Version: 1.0 Date: Thu, 25 Mar 2021 13:10:12 +0530 From: Sai Prakash Ranjan To: Will Deacon Subject: Re: [PATCHv2 2/2] iommu/arm-smmu-qcom: Move the adreno smmu specific impl earlier In-Reply-To: <8cfaed1915ad6dd0c34ac7eb2391b410@codeaurora.org> References: <20210227135321.420-1-saiprakash.ranjan@codeaurora.org> <8cfaed1915ad6dd0c34ac7eb2391b410@codeaurora.org> Message-ID: <727fa9fe2e644f88ba35c2877d71788e@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, jcrouse@codeaurora.org, akhilpo@codeaurora.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: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi Will, On 2021-03-15 00:31, Sai Prakash Ranjan wrote: > On 2021-03-12 04:59, Bjorn Andersson wrote: >> On Sat 27 Feb 07:53 CST 2021, Sai Prakash Ranjan wrote: >> >>> Hi Bjorn, >>> >>> On 2021-02-27 00:44, Bjorn Andersson wrote: >>> > On Fri 26 Feb 12:23 CST 2021, Rob Clark wrote: >>> > >>> > >>> > The current logic picks one of: >>> > 1) is the compatible mentioned in qcom_smmu_impl_of_match[] >>> > 2) is the compatible an adreno >>> > 3) no quirks needed >>> > >>> > The change flips the order of these, so the only way I can see this >>> > change affecting things is if we expected a match on #2, but we got one >>> > on #1. >>> > >>> > Which implies that the instance that we want to act according to the >>> > adreno impl was listed in qcom_smmu_impl_of_match[] - which either is >>> > wrong, or there's a single instance that needs both behaviors. >>> > >>> > (And I believe Jordan's answer confirms the latter - there's a single >>> > SMMU instance that needs all them quirks at once) >>> > >>> >>> Let me go through the problem statement in case my commit message >>> wasn't >>> clear. There are two SMMUs (APSS and GPU) on SC7280 and both are >>> SMMU500 >>> (ARM SMMU IP). >>> >>> APSS SMMU compatible - ("qcom,sc7280-smmu-500", "arm,mmu-500") >>> GPU SMMU compatible - ("qcom,sc7280-smmu-500", "qcom,adreno-smmu", >>> "arm,mmu-500") >>> >>> Now if we take SC7180 as an example, GPU SMMU was QSMMU(QCOM SMMU IP) >>> and APSS SMMU was SMMU500(ARM SMMU IP). >>> >>> APSS SMMU compatible - ("qcom,sc7180-smmu-500", "arm,mmu-500") >>> GPU SMMU compatible - ("qcom,sc7180-smmu-v2", "qcom,adreno-smmu", >>> "qcom,smmu-v2") >>> >>> Current code sequence without this patch, >>> >>> if (of_match_node(qcom_smmu_impl_of_match, np)) >>> return qcom_smmu_create(smmu, &qcom_smmu_impl); >>> >>> if (of_device_is_compatible(np, "qcom,adreno-smmu")) >>> return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl); >>> >>> Now if we look at the compatible for SC7180, there is no problem >>> because >>> the APSS SMMU will match the one in qcom_smmu_impl_of_match[] and GPU >>> SMMU >>> will match "qcom,adreno-smmu" because the compatible strings are >>> different. >>> But for SC7280, both the APSS SMMU and GPU SMMU >>> compatible("qcom,sc7280-smmu-500") >>> are same. So GPU SMMU will match with the one in >>> qcom_smmu_impl_of_match[] >>> i.e.., "qcom,sc7280-smmu-500" which functionally doesn't cause any >>> problem >>> but we will miss settings for split pagetables which are part of GPU >>> SMMU >>> specific implementation. >>> >>> We can avoid this with yet another new compatible for GPU SMMU >>> something like >>> "qcom,sc7280-adreno-smmu-500" but since we can handle this easily in >>> the >>> driver and since the IPs are same, meaning if there was a hardware >>> quirk >>> required, then we would need to apply to both of them and would this >>> additional >>> compatible be of any help? >>> >> >> No, I think you're doing the right thing of having them both. I just >> didn't remember us doing that. >> >>> Coming to the part of quirks now, you are right saying both SMMUs >>> will need >>> to have the same quirks in SC7280 and similar others where both are >>> based on >>> same IPs but those should probably be *hardware quirks* and if they >>> are >>> software based like the S2CR quirk depending on the firmware, then it >>> might >>> not be applicable to both. In case if it is applicable, then as >>> Jordan mentioned, >>> we can add the same quirks in GPU SMMU implementation. >>> >> >> I do suspect that at some point (probably sooner than later) we'd have >> to support both inheriting of stream from the bootloader and the >> Adreno >> "quirks" in the same instance. >> >> But for now this is okay to me. >> > > Sure, let me know if you or anyone face any issues without it and I > will > add it. I will resend this series with the dt-bindings patch for sc7280 > smmu > which wasn't cc'd to smmu folks by mistake. > I think there is consensus on this series. I can resend if required but it still applies cleanly, let me know if you have any comments? Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu