arch/arm64/include/asm/xen/page-coherent.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_ARM64_XEN_PAGE_COHERENT_H
   3 #define _ASM_ARM64_XEN_PAGE_COHERENT_H
   4
   5 #include <linux/dma-mapping.h>
   6 #include <asm/page.h>
   7 #include <xen/arm/page-coherent.h>
   8
   9 static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
  10                 dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
  11 {
  12         return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
  13 }
  14
  15 static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
  16                 void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
  17 {
  18         dma_direct_free(hwdev, size, cpu_addr, dma_handle, attrs);
  19 }
  20
  21 static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
  22                 dma_addr_t handle, size_t size, enum dma_data_direction dir)
  23 {
  24         unsigned long pfn = PFN_DOWN(handle);
  25
  26         if (pfn_valid(pfn))
  27                 dma_direct_sync_single_for_cpu(hwdev, handle, size, dir);
  28         else
  29                 __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
  30 }
  31
  32 static inline void xen_dma_sync_single_for_device(struct device *hwdev,
  33                 dma_addr_t handle, size_t size, enum dma_data_direction dir)
  34 {
  35         unsigned long pfn = PFN_DOWN(handle);
  36         if (pfn_valid(pfn))
  37                 dma_direct_sync_single_for_device(hwdev, handle, size, dir);
  38         else
  39                 __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
  40 }
  41
  42 static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
  43              dma_addr_t dev_addr, unsigned long offset, size_t size,
  44              enum dma_data_direction dir, unsigned long attrs)
  45 {
  46         unsigned long page_pfn = page_to_xen_pfn(page);
  47         unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
  48         unsigned long compound_pages =
  49                 (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
  50         bool local = (page_pfn <= dev_pfn) &&
  51                 (dev_pfn - page_pfn < compound_pages);
  52
  53         if (local)
  54                 dma_direct_map_page(hwdev, page, offset, size, dir, attrs);
  55         else
  56                 __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
  57 }
  58
  59 static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
  60                 size_t size, enum dma_data_direction dir, unsigned long attrs)
  61 {
  62         unsigned long pfn = PFN_DOWN(handle);
  63         /*
  64          * Dom0 is mapped 1:1, while the Linux page can be spanned accross
  65          * multiple Xen page, it's not possible to have a mix of local and
  66          * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
  67          * foreign mfn will always return false. If the page is local we can
  68          * safely call the native dma_ops function, otherwise we call the xen
  69          * specific function.
  70          */
  71         if (pfn_valid(pfn))
  72                 dma_direct_unmap_page(hwdev, handle, size, dir, attrs);
  73         else
  74                 __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
  75 }
  76
  77 #endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */