On Wed, 2020-12-23 at 17:15 +0900, Tomasz Figa wrote: > Hi Yong, > > On Wed, Dec 09, 2020 at 04:00:39PM +0800, Yong Wu wrote: > > In the latest SoC, there are several HW IP require a sepecial iova > > range, mainly CCU and VPU has this requirement. Take CCU as a example, > > CCU require its iova locate in the range(0x4000_0000 ~ 0x43ff_ffff). > > Is this really a domain? Does the address range come from the design of > the IOMMU? It is not a really a domain. The address range comes from CCU HW requirement. That HW can only access this iova range. thus I create a special iommu domain for it. > > Best regards, > Tomasz > > > > > In this patch we add a domain definition for the special port. In the > > example of CCU, If we preassign CCU port in domain1, then iommu driver > > will prepare a independent iommu domain of the special iova range for it, > > then the iova got from dma_alloc_attrs(ccu-dev) will locate in its special > > range. > > > > This is a preparing patch for multi-domain support. > > > > Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx> > > Acked-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> > > Acked-by: Rob Herring <robh@xxxxxxxxxx> > > --- > > include/dt-bindings/memory/mtk-smi-larb-port.h | 9 ++++++++- > > 1 file changed, 8 insertions(+), 1 deletion(-) > > > > diff --git a/include/dt-bindings/memory/mtk-smi-larb-port.h b/include/dt-bindings/memory/mtk-smi-larb-port.h > > index 7d64103209af..2d4c973c174f 100644 > > --- a/include/dt-bindings/memory/mtk-smi-larb-port.h > > +++ b/include/dt-bindings/memory/mtk-smi-larb-port.h > > @@ -7,9 +7,16 @@ > > #define __DT_BINDINGS_MEMORY_MTK_MEMORY_PORT_H_ > > > > #define MTK_LARB_NR_MAX 32 > > +#define MTK_M4U_DOM_NR_MAX 8 > > + > > +#define MTK_M4U_DOM_ID(domid, larb, port) \ > > + (((domid) & 0x7) << 16 | (((larb) & 0x1f) << 5) | ((port) & 0x1f)) > > + > > +/* The default dom id is 0. */ > > +#define MTK_M4U_ID(larb, port) MTK_M4U_DOM_ID(0, larb, port) > > > > -#define MTK_M4U_ID(larb, port) (((larb) << 5) | (port)) > > #define MTK_M4U_TO_LARB(id) (((id) >> 5) & 0x1f) > > #define MTK_M4U_TO_PORT(id) ((id) & 0x1f) > > +#define MTK_M4U_TO_DOM(id) (((id) >> 16) & 0x7) > > > > #endif > > -- > > 2.18.0 > > > > _______________________________________________ > > iommu mailing list > > iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx > > https://lists.linuxfoundation.org/mailman/listinfo/iommu
