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xen/arm: introduce GNTTABOP_cache_flush

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Introduce support for new hypercall GNTTABOP_cache_flush.
Use it to perform cache flashing on pages used for dma when necessary.

If GNTTABOP_cache_flush is supported by the hypervisor, we don't need to
bounce dma map operations that involve foreign grants and non-coherent
devices.

Signed-off-by: Stefano Stabellini <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Acked-by: Ian Campbell <[email protected]>
This commit is contained in:
Stefano Stabellini 2014-11-21 11:08:39 +00:00 • committed by David Vrabel
commit da095a9960
2 changed files with 51 additions and 2 deletions
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19
include/xen/interface/grant_table.h
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@ -478,6 +478,25 @@ struct gnttab_get_version {
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
/*
* Issue one or more cache maintenance operations on a portion of a
* page granted to the calling domain by a foreign domain.
*/
#define GNTTABOP_cache_flush 12
struct gnttab_cache_flush {
union {
uint64_t dev_bus_addr;
grant_ref_t ref;
} a;
uint16_t offset; /* offset from start of grant */
uint16_t length; /* size within the grant */
#define GNTTAB_CACHE_CLEAN (1<<0)
#define GNTTAB_CACHE_INVAL (1<<1)
#define GNTTAB_CACHE_SOURCE_GREF (1<<31)
uint32_t op;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush);
/*
* Bitfield values for update_pin_status.flags.
*/