[RFC PATCH v5 03/10] iommu/riscv: report iommu capabilities

[Gong Shuai]

Hi Fangyu,

> From: Tomasz Jeznach <tjeznach at rivosinc.com>
>
> Report RISC-V IOMMU capabilities required by VFIO subsystem
> to enable PCIe device assignment.
>
> Signed-off-by: Tomasz Jeznach <tjeznach at rivosinc.com>
> Signed-off-by: Fangyu Yu <fangyu.yu at linux.alibaba.com>
> Reviewed-by: Nutty Liu <nutty.liu at hotmail.com>

This patch has already been merged
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3069e8f3e1e9bdf007316eadae4d1777065e7b78

Thanks,
Shuai

> ---
>  drivers/iommu/riscv/iommu.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
> index fe8e6d0f8a23..40beccedd39f 100644
> --- a/drivers/iommu/riscv/iommu.c
> +++ b/drivers/iommu/riscv/iommu.c
> @@ -1444,6 +1444,16 @@ static struct iommu_group *riscv_iommu_device_group(struct device *dev)
>  	return generic_device_group(dev);
>  }
> 
> +static bool riscv_iommu_capable(struct device *dev, enum iommu_cap cap)
> +{
> +	switch (cap) {
> +	case IOMMU_CAP_CACHE_COHERENCY:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
>  static int riscv_iommu_of_xlate(struct device *dev, const struct of_phandle_args *args)
>  {
>  	return iommu_fwspec_add_ids(dev, args->args, 1);
> @@ -1505,6 +1515,7 @@ static void riscv_iommu_release_device(struct device *dev)
> 
>  static const struct iommu_ops riscv_iommu_ops = {
>  	.of_xlate = riscv_iommu_of_xlate,
> +	.capable = riscv_iommu_capable,
>  	.identity_domain = &riscv_iommu_identity_domain,
>  	.blocked_domain = &riscv_iommu_blocking_domain,
>  	.release_domain = &riscv_iommu_blocking_domain,
> -- 
> 2.50.1