swiotlb-xen: use xen_alloc/free_coherent_pages

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Use xen_alloc_coherent_pages and xen_free_coherent_pages to allocate or
free coherent pages.

We need to be careful handling the pointer returned by
xen_alloc_coherent_pages, because on ARM the pointer is not equal to
phys_to_virt(*dma_handle). In fact virt_to_phys only works for kernel
direct mapped RAM memory.
In ARM case the pointer could be an ioremap address, therefore passing
it to virt_to_phys would give you another physical address that doesn't
correspond to it.

Make xen_create_contiguous_region take a phys_addr_t as start parameter to
avoid the virt_to_phys calls which would be incorrect.

Changes in v6:
- remove extra spaces.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

...

This commit is contained in:

Stefano Stabellini 2013-10-10 13:41:10 +00:00

parent d6fe76c58c

commit 1b65c4e5a9

4 changed files with 31 additions and 17 deletions

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6

arch/arm/xen/mm.c

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7

arch/x86/xen/mmu.c

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31

drivers/xen/swiotlb-xen.c

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4

include/xen/xen-ops.h

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