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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2015-04-24 10:16:40 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-05-06 15:02:58 +0100 |
| commit | 8746515d7f04c9ea94cf43e2db1fd2cfca93276d (patch) | |
| tree | d6770d527bfdffc9e9a4fe2f970304a547cde20d /arch/x86 | |
| parent | a71dbdaa8ca2933391b08e0ae5567083e3af0892 (diff) | |
| download | linux-8746515d7f04c9ea94cf43e2db1fd2cfca93276d.tar.bz2 | |
xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM
Make sure that xen_swiotlb_init allocates buffers that are DMA capable
when at least one memblock is available below 4G. Otherwise we assume
that all devices on the SoC can cope with >4G addresses. We do this on
ARM and ARM64, where dom0 is mapped 1:1, so pfn == mfn in this case.
No functional changes on x86.
From: Chen Baozi <baozich@gmail.com>
Signed-off-by: Chen Baozi <baozich@gmail.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Chen Baozi <baozich@gmail.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index 358dcd338915..c44a5d53e464 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -269,4 +269,9 @@ static inline bool xen_arch_need_swiotlb(struct device *dev, return false; } +static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order) +{ + return __get_free_pages(__GFP_NOWARN, order); +} + #endif /* _ASM_X86_XEN_PAGE_H */ |