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author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-10 13:41:10 +0000 |
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committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-10 13:41:10 +0000 |
commit | 1b65c4e5a9af1a1c61e792e2d0ed481e0c1f21a9 (patch) | |
tree | 15c7b03e6efede8905f3729de488341c9a9da81b /arch/arm64/include/asm/xen/page-coherent.h | |
parent | d6fe76c58c358498b91d21f0ca8054f6aa6e672d (diff) | |
download | op-kernel-dev-1b65c4e5a9af1a1c61e792e2d0ed481e0c1f21a9.zip op-kernel-dev-1b65c4e5a9af1a1c61e792e2d0ed481e0c1f21a9.tar.gz |
swiotlb-xen: use xen_alloc/free_coherent_pages
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>
Diffstat (limited to 'arch/arm64/include/asm/xen/page-coherent.h')
0 files changed, 0 insertions, 0 deletions