Re: [PATCH resend] powernv/iommu: disable IOMMU bypass with param iommu=nobypass

[Michael Ellerman <mpe@ellerman.id.au>]

On Wed, 2015-01-21 at 13:23 -0200, Thadeu Lima de Souza Cascardo wrote:
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index fac88ed..f942a19 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -75,6 +75,27 @@ static void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level,
>  #define pe_info(pe, fmt, ...)					\
>  	pe_level_printk(pe, KERN_INFO, fmt, ##__VA_ARGS__)
>  
> +static bool pnv_iommu_bypass_disabled __read_mostly;
> +
> +static int __init iommu_setup(char *str)
> +{
> +	if (!str)
> +		return -EINVAL;
> +	while (*str) {
> +		if (!strncmp(str, "nobypass", 8)) {
> +			pnv_iommu_bypass_disabled = true;
> +			pr_info("PowerNV: IOMMU bypass window disabled.\n");

I added a break here.

> +		}
> +		str += strcspn(str, ",");
> +		if (*str == ',')
> +			str++;
> +	}
> +
> +	return 0;
> +}
> +
> +early_param("iommu", iommu_setup);

cheers