linux-kernel - Re: [PATCH v3 2/2] acpi/iort: numa: Add numa node mapping for smmuv3 devices

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Date:   Tue, 4 Jul 2017 11:07:59 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Robert Richter <robert.richter@...ium.com>
Cc:     Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        lv.zheng@...el.com, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Will.Deacon@....com, hanjun.guo@...aro.org, sudeep.holla@....com,
        robin.murphy@....com, joro@...tes.org, lenb@...nel.org,
        jnair@...iumnetworks.com, gpkulkarni@...il.com
Subject: Re: [PATCH v3 2/2] acpi/iort: numa: Add numa node mapping for smmuv3
 devices

Hi Robert,

On Wed, Jun 28, 2017 at 07:47:50PM +0200, Robert Richter wrote:
> On 15.06.17 14:46:03, Lorenzo Pieralisi wrote:
> > On Thu, Jun 08, 2017 at 10:14:19AM +0530, Ganapatrao Kulkarni wrote:
> > > Add code to parse proximity domain in SMMUv3 IORT table to
> > > set numa node mapping for smmuv3 devices.
> > > 
> > > Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
> > > ---
> > >  drivers/acpi/arm64/iort.c | 28 ++++++++++++++++++++++++++--
> > >  1 file changed, 26 insertions(+), 2 deletions(-)
> > 
> > I am happy to take this but I want to know what we shall do with
> > patch 1 and related ACPICA changes first.
> 
> The change is now in acpica:
> 
>  https://github.com/acpica/acpica/commit/8cadc4fb500e2aa52241e367c87a0f95d9760c58
> 
> So we could guard the code with an #ifdef until that patch is pulled
> in via acpica tree:
> 
> > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> > > index bba2b59..e804386 100644
> > > --- a/drivers/acpi/arm64/iort.c
> > > +++ b/drivers/acpi/arm64/iort.c
> > > @@ -882,6 +882,23 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
> > >  	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
> > >  }
> > >  
> > > +/*
> > > + * set numa proximity domain for smmuv3 device
> > > + */
> > > +static void  __init arm_smmu_v3_set_proximity(struct acpi_iort_node *node,
> > > +		struct device *dev)
> > > +{
> 
> #ifdef ACPI_IORT_SMMU_V3_PXM_VALID
> 
> > > +	struct acpi_iort_smmu_v3 *smmu;
> > > +
> > > +	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
> > > +	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
> > > +		set_dev_node(dev, acpi_map_pxm_to_node(smmu->pxm));
> > > +		pr_info("SMMUV3[%llx] Mapped to Proximity domain %d\n",
> > > +			smmu->base_address,
> > > +			smmu->pxm);
> > > +	}
> 
> #endif
> 
> > > +}
> > > +
> 
> Could the patch be applied with this change?

Sorry I was away (and the ARM64 tree was not accepting any new code last
week anyway), I will send the patch upstream for 4.14 (with your change
above - or whatever ACPICA guard make it safe - since we will depend on
ACPICA changes merge timing anyway - they won't be merged this cycle).

Bad timing, apologies, I hope it is not a burden to carry it for one
cycle.

Thanks,
Lorenzo

> 
> Thanks,
> 
> -Robert
> 
> > >  static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
> > >  {
> > >  	struct acpi_iort_smmu *smmu;
> > > @@ -951,20 +968,24 @@ struct iort_iommu_config {
> > >  	int (*iommu_count_resources)(struct acpi_iort_node *node);
> > >  	void (*iommu_init_resources)(struct resource *res,
> > >  				     struct acpi_iort_node *node);
> > > +	void (*iommu_set_proximity)(struct acpi_iort_node *node,
> > > +				     struct device *dev);
> > >  };
> > >  
> > >  static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
> > >  	.name = "arm-smmu-v3",
> > >  	.iommu_is_coherent = arm_smmu_v3_is_coherent,
> > >  	.iommu_count_resources = arm_smmu_v3_count_resources,
> > > -	.iommu_init_resources = arm_smmu_v3_init_resources
> > > +	.iommu_init_resources = arm_smmu_v3_init_resources,
> > > +	.iommu_set_proximity = arm_smmu_v3_set_proximity
> > >  };
> > >  
> > >  static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
> > >  	.name = "arm-smmu",
> > >  	.iommu_is_coherent = arm_smmu_is_coherent,
> > >  	.iommu_count_resources = arm_smmu_count_resources,
> > > -	.iommu_init_resources = arm_smmu_init_resources
> > > +	.iommu_init_resources = arm_smmu_init_resources,
> > > +	.iommu_set_proximity = NULL
> > >  };
> > >  
> > >  static __init
> > > @@ -1002,6 +1023,9 @@ static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
> > >  	if (!pdev)
> > >  		return -ENOMEM;
> > >  
> > > +	if (ops->iommu_set_proximity)
> > > +		ops->iommu_set_proximity(node, &pdev->dev);
> > > +
> > >  	count = ops->iommu_count_resources(node);
> > >  
> > >  	r = kcalloc(count, sizeof(*r), GFP_KERNEL);
> > > -- 
> > > 1.8.1.4
> > > 
> > --
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