Re: [PATCH v4] acpi/iort: numa: Add numa node mapping for smmuv3 devices

[Hanjun Guo <guohanjun@huawei.com>]

On 2017/8/3 0:21, Lorenzo Pieralisi wrote:
> Patch that I will send upstream below, please check, thanks.
>
> -- >8 --
> Subject: [PATCH] ACPI/IORT: numa: Add numa node mapping for smmuv3 devices
>
> ARM IORT specification(rev. C) has added  provision to define proximity
> domain in SMMUv3 IORT table. Adding required code to parse Proximity
> domain and set numa_node of smmv3 platform devices.
>
> Add code to parse proximity domain in SMMUv3 IORT table to
> set numa node mapping for smmuv3 devices.
>
> Link: http://lkml.kernel.org/r/20170706112017.GA16981@rric.localdomain
> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
> [lorenzo.pieralisi@arm.com: updated review comments]
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> ---
>  drivers/acpi/arm64/iort.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index a3215ee..35dd803 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -908,6 +908,27 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
>  	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
>  }
>  
> +#if defined(CONFIG_ACPI_NUMA) && defined(ACPI_IORT_SMMU_v3_PXM_VALID)

Typo here, s/v3/V3, wit this typo, smmu proximity callback will be set to NULL.

> +/*
> + * set numa proximity domain for smmuv3 device
> + */
> +static void  __init arm_smmu_v3_set_proximity(struct device *dev,
> +					      struct acpi_iort_node *node)
> +{
> +	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));
> +		dev_info(dev, "SMMUV3[%llx] Mapped to Proximity domain %d\n",
> +			smmu->base_address,
> +			smmu->pxm);

Here I got:

[    5.074246]  (null): SMMUV3[a0040000] Mapped to Proximity domain 0
[    5.074296]  (null): SMMUV3[700a0040000] Mapped to Proximity domain 2
[    5.074319]  (null): SMMUV3[c0040000] Mapped to Proximity domain 0
[    5.074344]  (null): SMMUV3[8a0040000] Mapped to Proximity domain 1
[    5.074368]  (null): SMMUV3[600a0040000] Mapped to Proximity domain 2

SMMU is probed via static table (IORT) , so no proper name before it
fully probed.

Can we just use pr_info here to remove the meaningless (null), or
we give the SMMU a proper name?

Thanks
Hanjun

> +	}
> +}
> +#else
> +#define arm_smmu_v3_set_proximity NULL
> +#endif
> +
>  static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
>  {
>  	struct acpi_iort_smmu *smmu;
> @@ -977,13 +998,16 @@ 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 device *dev,
> +				    struct acpi_iort_node *node);
>  };
>  
>  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 = {
> @@ -1028,6 +1052,9 @@ 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(&pdev->dev, node);
> +
>  	count = ops->iommu_count_resources(node);
>  
>  	r = kcalloc(count, sizeof(*r), GFP_KERNEL);