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From: Jordan Crouse <jordan@cosmicpenguin.net>
To: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Cc: Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>,
	Jordan Crouse <jcrouse@codeaurora.org>,
	Rob Clark <robdclark@gmail.com>,
	Akhil P Oommen <akhilpo@codeaurora.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv2 2/2] iommu/arm-smmu-qcom: Move the adreno smmu specific impl earlier
Date: Fri, 26 Feb 2021 08:51:53 -0700
Message-ID: <20210226155153.hzcesc2gr2qmleh2@cosmicpenguin.net> (raw)
In-Reply-To: <c607d71eb0fe507c8b83cc0ea9b393777f22149a.1614332994.git.saiprakash.ranjan@codeaurora.org>

On Fri, Feb 26, 2021 at 03:25:40PM +0530, Sai Prakash Ranjan wrote:
> Adreno(GPU) SMMU and APSS(Application Processor SubSystem) SMMU
> both implement "arm,mmu-500" in some QTI SoCs and to run through
> adreno smmu specific implementation such as enabling split pagetables
> support, we need to match the "qcom,adreno-smmu" compatible first
> before apss smmu or else we will be running apps smmu implementation
> for adreno smmu and the additional features for adreno smmu is never
> set. For ex: we have "qcom,sc7280-smmu-500" compatible for both apps
> and adreno smmu implementing "arm,mmu-500", so the adreno smmu
> implementation is never reached because the current sequence checks
> for apps smmu compatible(qcom,sc7280-smmu-500) first and runs that
> specific impl and we never reach adreno smmu specific implementation.
> 
> Suggested-by: Akhil P Oommen <akhilpo@codeaurora.org>

Acked-by: Jordan Crouse <jordan@cosmicpenguin.net>

> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index bea3ee0dabc2..03f048aebb80 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -345,11 +345,17 @@ struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)
>  {
>  	const struct device_node *np = smmu->dev->of_node;
>  
> -	if (of_match_node(qcom_smmu_impl_of_match, np))
> -		return qcom_smmu_create(smmu, &qcom_smmu_impl);
> -
> +	/*
> +	 * Do not change this order of implementation, i.e., first adreno
> +	 * smmu impl and then apss smmu since we can have both implementing
> +	 * arm,mmu-500 in which case we will miss setting adreno smmu specific
> +	 * features if the order is changed.
> +	 */
>  	if (of_device_is_compatible(np, "qcom,adreno-smmu"))
>  		return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl);
>  
> +	if (of_match_node(qcom_smmu_impl_of_match, np))
> +		return qcom_smmu_create(smmu, &qcom_smmu_impl);
> +
>  	return smmu;
>  }
> -- 
> 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

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26  9:55 [PATCHv2 0/2] iommu/arm-smmu-qcom: Add SC7280 support Sai Prakash Ranjan
2021-02-26  9:55 ` [PATCHv2 1/2] iommu/arm-smmu-qcom: Add SC7280 SMMU compatible Sai Prakash Ranjan
2021-02-26  9:55 ` [PATCHv2 2/2] iommu/arm-smmu-qcom: Move the adreno smmu specific impl earlier Sai Prakash Ranjan
2021-02-26 15:51   ` Jordan Crouse [this message]
2021-02-26 17:24   ` Bjorn Andersson
2021-02-26 18:23     ` Rob Clark
2021-02-26 19:14       ` Bjorn Andersson
2021-02-27 13:53         ` Sai Prakash Ranjan
2021-03-11 23:29           ` Bjorn Andersson
2021-03-14 19:01             ` Sai Prakash Ranjan
2021-03-25  7:40               ` Sai Prakash Ranjan
2021-03-25 15:05                 ` Will Deacon
2021-04-05  8:42                   ` Sai Prakash Ranjan
2021-04-19  3:11                     ` Sai Prakash Ranjan
2021-02-26 18:48     ` Jordan Crouse
2021-02-26 19:54       ` Jordan Crouse
2021-04-19 14:38   ` Bjorn Andersson
2021-04-20  6:06     ` Sai Prakash Ranjan

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