arch/arm/xen/mm.c

   1 #include <linux/bootmem.h>
   2 #include <linux/gfp.h>
   3 #include <linux/export.h>
   4 #include <linux/slab.h>
   5 #include <linux/types.h>
   6 #include <linux/dma-mapping.h>
   7 #include <linux/vmalloc.h>
   8 #include <linux/swiotlb.h>
   9
  10 #include <xen/xen.h>
  11 #include <xen/interface/memory.h>
  12 #include <xen/swiotlb-xen.h>
  13
  14 #include <asm/cacheflush.h>
  15 #include <asm/xen/page.h>
  16 #include <asm/xen/hypercall.h>
  17 #include <asm/xen/interface.h>
  18
  19 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
  20                                  unsigned int address_bits,
  21                                  dma_addr_t *dma_handle)
  22 {
  23         if (!xen_initial_domain())
  24                 return -EINVAL;
  25
  26         /* we assume that dom0 is mapped 1:1 for now */
  27         *dma_handle = pstart;
  28         return 0;
  29 }
  30 EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
  31
  32 void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
  33 {
  34         return;
  35 }
  36 EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
  37
  38 struct dma_map_ops *xen_dma_ops;
  39 EXPORT_SYMBOL_GPL(xen_dma_ops);
  40
  41 static struct dma_map_ops xen_swiotlb_dma_ops = {
  42         .mapping_error = xen_swiotlb_dma_mapping_error,
  43         .alloc = xen_swiotlb_alloc_coherent,
  44         .free = xen_swiotlb_free_coherent,
  45         .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
  46         .sync_single_for_device = xen_swiotlb_sync_single_for_device,
  47         .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
  48         .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
  49         .map_sg = xen_swiotlb_map_sg_attrs,
  50         .unmap_sg = xen_swiotlb_unmap_sg_attrs,
  51         .map_page = xen_swiotlb_map_page,
  52         .unmap_page = xen_swiotlb_unmap_page,
  53         .dma_supported = xen_swiotlb_dma_supported,
  54         .set_dma_mask = xen_swiotlb_set_dma_mask,
  55 };
  56
  57 int __init xen_mm_init(void)
  58 {
  59         if (!xen_initial_domain())
  60                 return 0;
  61         xen_swiotlb_init(1, false);
  62         xen_dma_ops = &xen_swiotlb_dma_ops;
  63         return 0;
  64 }
  65 arch_initcall(xen_mm_init);