[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 03/13] xen/arm: p2m: Add helper to convert p2m type to IOMMU flags
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> The helper has the same purpose as existing for x86 one. It is used for choosing IOMMU mapping attribute according to the memory type. Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> Reviewed-by: Julien Grall <julien.grall@xxxxxxx> --- Changes in v1: - Add Julien's reviewed-by Changes in v2: - --- xen/include/asm-arm/p2m.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index 1269052..635cc25 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -5,6 +5,7 @@ #include <xen/radix-tree.h> #include <xen/rwlock.h> #include <xen/mem_access.h> +#include <xen/iommu.h> #include <public/vm_event.h> /* for vm_event_response_t */ #include <public/memory.h> #include <xen/p2m-common.h> @@ -353,6 +354,39 @@ static inline gfn_t gfn_next_boundary(gfn_t gfn, unsigned int order) return gfn_add(gfn, 1UL << order); } +/* + * p2m type to IOMMU flags + */ +static inline unsigned int p2m_get_iommu_flags(p2m_type_t p2mt) +{ + unsigned int flags; + + switch( p2mt ) + { + case p2m_ram_rw: + case p2m_iommu_map_rw: + case p2m_map_foreign: + case p2m_grant_map_rw: + case p2m_mmio_direct_dev: + case p2m_mmio_direct_nc: + case p2m_mmio_direct_c: + flags = IOMMUF_readable | IOMMUF_writable; + break; + case p2m_ram_ro: + case p2m_iommu_map_ro: + case p2m_grant_map_ro: + flags = IOMMUF_readable; + break; + default: + flags = 0; + break; + } + + /* TODO Do we need to handle access permissions here? */ + + return flags; +} + #endif /* _XEN_P2M_H */ /* -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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