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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2013-05-21 07:33:10 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-20 10:55:14 +0400 |
| commit | 5ffd229c02731a91d08ca21e76b503c5bbb5c095 (patch) | |
| tree | ed5f684cb6a5b683846d6b3d97fa2c0999835c24 /include | |
| parent | 4e13c1ac6baa1d6c2b650d66ca89e1e12727ec19 (diff) | |
| download | linux-5ffd229c02731a91d08ca21e76b503c5bbb5c095.tar.xz | |
powerpc/vfio: Implement IOMMU driver for VFIO
VFIO implements platform independent stuff such as
a PCI driver, BAR access (via read/write on a file descriptor
or direct mapping when possible) and IRQ signaling.
The platform dependent part includes IOMMU initialization
and handling. This implements an IOMMU driver for VFIO
which does mapping/unmapping pages for the guest IO and
provides information about DMA window (required by a POWER
guest).
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/vfio.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 284ff2436829..87ee4f4cff25 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -22,6 +22,7 @@ /* Extensions */ #define VFIO_TYPE1_IOMMU 1 +#define VFIO_SPAPR_TCE_IOMMU 2 /* * The IOCTL interface is designed for extensibility by embedding the @@ -375,4 +376,37 @@ struct vfio_iommu_type1_dma_unmap { #define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14) +/* + * IOCTLs to enable/disable IOMMU container usage. + * No parameters are supported. + */ +#define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15) +#define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16) + +/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ + +/* + * The SPAPR TCE info struct provides the information about the PCI bus + * address ranges available for DMA, these values are programmed into + * the hardware so the guest has to know that information. + * + * The DMA 32 bit window start is an absolute PCI bus address. + * The IOVA address passed via map/unmap ioctls are absolute PCI bus + * addresses too so the window works as a filter rather than an offset + * for IOVA addresses. + * + * A flag will need to be added if other page sizes are supported, + * so as defined here, it is always 4k. + */ +struct vfio_iommu_spapr_tce_info { + __u32 argsz; + __u32 flags; /* reserved for future use */ + __u32 dma32_window_start; /* 32 bit window start (bytes) */ + __u32 dma32_window_size; /* 32 bit window size (bytes) */ +}; + +#define VFIO_IOMMU_SPAPR_TCE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) + +/* ***************************************************************** */ + #endif /* _UAPIVFIO_H */ |