[PATCH v6 10/25] iommu/exynos: Implement an IDENTITY domain

[Jason Gunthorpe]

On Mon, Aug 14, 2023 at 12:52:34PM +0800, Baolu Lu wrote:
> On 2023/8/3 8:07, Jason Gunthorpe wrote:
> > What exynos calls exynos_iommu_detach_device is actually putting the iommu
> > into identity mode.
> > 
> > Move to the new core support for ARM_DMA_USE_IOMMU by defining
> > ops->identity_domain.
> > 
> > Tested-by: Marek Szyprowski<m.szyprowski at samsung.com>
> > Acked-by: Marek Szyprowski<m.szyprowski at samsung.com>
> > Signed-off-by: Jason Gunthorpe<jgg at nvidia.com>
> > ---
> >   drivers/iommu/exynos-iommu.c | 66 +++++++++++++++++-------------------
> >   1 file changed, 32 insertions(+), 34 deletions(-)
> > 
> > diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> > index c275fe71c4db32..5e12b85dfe8705 100644
> > --- a/drivers/iommu/exynos-iommu.c
> > +++ b/drivers/iommu/exynos-iommu.c
> > @@ -24,6 +24,7 @@
> >   typedef u32 sysmmu_iova_t;
> >   typedef u32 sysmmu_pte_t;
> > +static struct iommu_domain exynos_identity_domain;
> 
> Is there a conflict between above and below?

No, this is a C forward declaration.

Jason