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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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@@ -16,7 +16,7 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/interface.h>
int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
@@ -24,12 +24,12 @@ int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
return -EINVAL;
/* we assume that dom0 is mapped 1:1 for now */
*dma_handle = virt_to_phys(pstart);
*dma_handle = pstart;
return 0;
}
EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
{
return;
}