1b65c4e5a9
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>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
#include <linux/bootmem.h>
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#include <linux/gfp.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/swiotlb.h>
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#include <xen/xen.h>
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#include <xen/interface/memory.h>
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#include <xen/swiotlb-xen.h>
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#include <asm/cacheflush.h>
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#include <asm/xen/page.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/interface.h>
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int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
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unsigned int address_bits,
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dma_addr_t *dma_handle)
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{
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if (!xen_initial_domain())
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return -EINVAL;
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/* we assume that dom0 is mapped 1:1 for now */
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*dma_handle = pstart;
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
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void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
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{
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return;
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}
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EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
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struct dma_map_ops *xen_dma_ops;
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EXPORT_SYMBOL_GPL(xen_dma_ops);
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static struct dma_map_ops xen_swiotlb_dma_ops = {
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.mapping_error = xen_swiotlb_dma_mapping_error,
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.alloc = xen_swiotlb_alloc_coherent,
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.free = xen_swiotlb_free_coherent,
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.sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
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.sync_single_for_device = xen_swiotlb_sync_single_for_device,
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.sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
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.map_sg = xen_swiotlb_map_sg_attrs,
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.unmap_sg = xen_swiotlb_unmap_sg_attrs,
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.map_page = xen_swiotlb_map_page,
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.unmap_page = xen_swiotlb_unmap_page,
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.dma_supported = xen_swiotlb_dma_supported,
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.set_dma_mask = xen_swiotlb_set_dma_mask,
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};
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int __init xen_mm_init(void)
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{
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if (!xen_initial_domain())
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return 0;
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xen_swiotlb_init(1, false);
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xen_dma_ops = &xen_swiotlb_dma_ops;
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return 0;
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}
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arch_initcall(xen_mm_init);
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