• Stefano Stabellini's avatar
    swiotlb-xen: use xen_alloc/free_coherent_pages · 1b65c4e5
    Stefano Stabellini authored
    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: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
    Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    1b65c4e5
xen-ops.h 1.11 KB