Hi Geert,

Thank you for the patch.

On Wed, Feb 20, 2019 at 04:05:27PM +0100, Geert Uytterhoeven wrote:
> On R-Car Gen3, the faulting virtual address is a 40-bit address, and
> comprised of two registers.  Read the upper address part, and combine
> both parts, when running on a 64-bit system.
> 
> Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
> ---
> Apart from this, the driver doesn't support 40-bit IOVA addresses yet.
> ---
>  drivers/iommu/ipmmu-vmsa.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index ac70cb967ff821c6..4d07c26c97848b65 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -186,7 +186,9 @@ static struct ipmmu_vmsa_device *to_ipmmu(struct device 
> *dev)
>  #define IMMAIR_ATTR_IDX_WBRWA                1
>  #define IMMAIR_ATTR_IDX_DEV          2
>  
> -#define IMEAR                                0x0030
> +#define IMEAR                                0x0030  /* R-Car Gen2 */
> +#define IMELAR                               IMEAR   /* R-Car Gen3 */

I would have defined that as a single macro.

> +#define IMEUAR                               0x0034  /* R-Car Gen3 */
>  
>  #define IMPCTR                               0x0200
>  #define IMPSTR                               0x0208
> @@ -521,14 +523,16 @@ static irqreturn_t ipmmu_domain_irq(struct 
> ipmmu_vmsa_domain *domain)
>  {
>       const u32 err_mask = IMSTR_MHIT | IMSTR_ABORT | IMSTR_PF | IMSTR_TF;
>       struct ipmmu_vmsa_device *mmu = domain->mmu;
> +     unsigned long iova;

Isn't there a more appropriate type, such as dma_addr_t possibly ?

>       u32 status;
> -     u32 iova;
>  
>       status = ipmmu_ctx_read_root(domain, IMSTR);
>       if (!(status & err_mask))
>               return IRQ_NONE;
>  
> -     iova = ipmmu_ctx_read_root(domain, IMEAR);
> +     iova = ipmmu_ctx_read_root(domain, IMELAR);
> +     if (IS_ENABLED(CONFIG_64BIT))
> +             iova |= (u64)ipmmu_ctx_read_root(domain, IMEUAR) << 32;
>  
>       /*
>        * Clear the error status flags. Unlike traditional interrupt flag
> @@ -540,10 +544,10 @@ static irqreturn_t ipmmu_domain_irq(struct 
> ipmmu_vmsa_domain *domain)
>  
>       /* Log fatal errors. */
>       if (status & IMSTR_MHIT)
> -             dev_err_ratelimited(mmu->dev, "Multiple TLB hits @0x%08x\n",
> +             dev_err_ratelimited(mmu->dev, "Multiple TLB hits @0x%lx\n",
>                                   iova);
>       if (status & IMSTR_ABORT)
> -             dev_err_ratelimited(mmu->dev, "Page Table Walk Abort @0x%08x\n",
> +             dev_err_ratelimited(mmu->dev, "Page Table Walk Abort @0x%lx\n",
>                                   iova);
>  
>       if (!(status & (IMSTR_PF | IMSTR_TF)))
> @@ -559,7 +563,7 @@ static irqreturn_t ipmmu_domain_irq(struct 
> ipmmu_vmsa_domain *domain)
>               return IRQ_HANDLED;
>  
>       dev_err_ratelimited(mmu->dev,
> -                         "Unhandled fault: status 0x%08x iova 0x%08x\n",
> +                         "Unhandled fault: status 0x%08x iova 0x%lx\n",
>                           status, iova);
>  
>       return IRQ_HANDLED;

-- 
Regards,

Laurent Pinchart
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