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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-25 10:33:26 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-25 10:33:26 +0000 |
| commit | 3d1975b57097820c131c692d2e0d075641370369 (patch) | |
| tree | 92784190b99b6b9e1a665a29dc2f1efb60623ff6 /arch/arm64 | |
| parent | 783d0281043b9a1111d81d11ed0610b83d8857ed (diff) | |
| download | talos-op-linux-3d1975b57097820c131c692d2e0d075641370369.tar.gz talos-op-linux-3d1975b57097820c131c692d2e0d075641370369.zip | |
arm,arm64: do not always merge biovec if we are running on Xen
This is similar to what it is done on X86: biovecs are prevented from merging
otherwise every dma requests would be forced to bounce on the swiotlb buffer.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Changes in v7:
- remove the extra autotranslate check in biomerge.c.
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/io.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 1d12f89140ba..c163287b9871 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -22,11 +22,14 @@ #ifdef __KERNEL__ #include <linux/types.h> +#include <linux/blk_types.h> #include <asm/byteorder.h> #include <asm/barrier.h> #include <asm/pgtable.h> +#include <xen/xen.h> + /* * Generic IO read/write. These perform native-endian accesses. */ @@ -263,5 +266,11 @@ extern int devmem_is_allowed(unsigned long pfn); */ #define xlate_dev_kmem_ptr(p) p +extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, + const struct bio_vec *vec2); +#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ + (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ + (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) + #endif /* __KERNEL__ */ #endif /* __ASM_IO_H */ |
