Re: [PATCH v7 3/5] iommu/arm-smmu: introduction of ACTLR for custom prefetcher settings

[Bibek Kumar Patro <quic_bibekkum@xxxxxxxxxxx>]

On 1/10/2024 9:36 AM, Pavan Kondeti wrote:
> On Tue, Jan 09, 2024 at 05:12:18PM +0530, Bibek Kumar Patro wrote:
> >   static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> >   		struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> >   {
> > +	struct arm_smmu_device *smmu = smmu_domain->smmu;
> > +	struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> > +	const struct actlr_variant *actlrvar;
> > +	int cbndx = smmu_domain->cfg.cbndx;
> >   	struct adreno_smmu_priv *priv;
> >
> >   	smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
> > @@ -248,6 +285,16 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> >   	priv->set_stall = qcom_adreno_smmu_set_stall;
> >   	priv->resume_translation = qcom_adreno_smmu_resume_translation;
> >
> > +	if (qsmmu->data->actlrvar) {
> > +		actlrvar = qsmmu->data->actlrvar;
> > +		for (; actlrvar->io_start; actlrvar++) {
> > +			if (actlrvar->io_start == smmu->ioaddr) {
> > +				qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar->actlrcfg);
> > +				break;
> > +			}
> > +		}
> > +	}
> > +
> >   	return 0;
> >   }
> >
> > @@ -274,6 +321,21 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
> >   static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> >   		struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> >   {
> > +	struct arm_smmu_device *smmu = smmu_domain->smmu;
> > +	struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> > +	const struct actlr_variant *actlrvar;
> > +	int cbndx = smmu_domain->cfg.cbndx;
> > +
> > +	if (qsmmu->data->actlrvar) {
> > +		actlrvar = qsmmu->data->actlrvar;
> > +		for (; actlrvar->io_start; actlrvar++) {
> > +			if (actlrvar->io_start == smmu->ioaddr) {
> > +				qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar->actlrcfg);
> > +				break;
> > +			}
> > +		}
> > +	}
> > +
>
> This block and the one in qcom_adreno_smmu_init_context() are exactly
> the same. Possible to do some refactoring?

I will check if this repeated blocks can be accomodated this into 
qcom_smmu_set_actlr function if that would be fine.

> >   	smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
> >
> >   	return 0;
> > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> > index f3b91963e234..29d26dfa2ed9 100644
> > --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> > @@ -1,6 +1,6 @@
> >   /* SPDX-License-Identifier: GPL-2.0-only */
> >   /*
> > - * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
> > + * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
> >    */
>
> It should be 2022-2023 .

Ack

> >   #ifndef _ARM_SMMU_QCOM_H
> > @@ -24,8 +24,17 @@ struct qcom_smmu_config {
> >   	const u32 *reg_offset;
> >   };
> >
> > +struct actlr_config;
> > +
> > +struct actlr_variant {
> > +	const struct actlr_config *actlrcfg;
> > +	const resource_size_t io_start;
> > +};
> > +
> >   struct qcom_smmu_match_data {
> > +	const struct actlr_variant *actlrvar;
> >   	const struct qcom_smmu_config *cfg;
> > +	const int num_smmu;
> >   	const struct arm_smmu_impl *impl;
> >   	const struct arm_smmu_impl *adreno_impl;
> >   };
>
> qcom_smmu_match_data::num_smmu needs cleanup.

Ack, thanks for pointing this out.

Thanks & regards,
Bibek

> Thanks,
> Pavan