2016-05-10 21:21 GMT+08:00 Wan Zongshun <vincent....@amd.com>: > From: Wan Zongshun <vincent....@amd.com> > > AMD has more drivers will use ACPI to platform bus driver later, > all those devices need iommu support, for example: eMMC driver. > > For latest AMD eMMC controller, it will utilize sdhci-acpi.c driver, > which will rely on platform bus to match device and driver, where we > will set 'dev' of struct platform_device as map_sg parameter passing > to iommu driver for DMA request, so the iommu-ops are needed on the > platform bus.
Joerg, How about this patch? it will impact our new eMMC controller driver bringup. Thanks. > > Signed-off-by: Wan Zongshun <vincent....@amd.com> > > --- > changes from v1: Add comment why the iommu-ops are needed on platform bus. > --- > drivers/iommu/amd_iommu.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c > index c430c10..547cdd4 100644 > --- a/drivers/iommu/amd_iommu.c > +++ b/drivers/iommu/amd_iommu.c > @@ -21,6 +21,7 @@ > #include <linux/pci.h> > #include <linux/acpi.h> > #include <linux/amba/bus.h> > +#include <linux/platform_device.h> > #include <linux/pci-ats.h> > #include <linux/bitmap.h> > #include <linux/slab.h> > @@ -2980,6 +2981,9 @@ int __init amd_iommu_init_api(void) > if (err) > return err; > #endif > + err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops); > + if (err) > + return err; > return 0; > } > > -- > 1.9.1 > -- --- Vincent Wan(Zongshun) www.mcuos.com
