return xen_phys_to_bus(virt_to_phys(address));
}
-static int check_pages_physically_contiguous(unsigned long xen_pfn,
- unsigned int offset,
- size_t length)
+static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
{
- unsigned long next_bfn;
- int i;
- int nr_pages;
+ unsigned long next_bfn, xen_pfn = XEN_PFN_DOWN(p);
+ unsigned int i, nr_pages = XEN_PFN_UP(xen_offset_in_page(p) + size);
next_bfn = pfn_to_bfn(xen_pfn);
- nr_pages = (offset + length + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT;
- for (i = 1; i < nr_pages; i++) {
+ for (i = 1; i < nr_pages; i++)
if (pfn_to_bfn(++xen_pfn) != ++next_bfn)
- return 0;
- }
- return 1;
-}
+ return 1;
-static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
-{
- unsigned long xen_pfn = XEN_PFN_DOWN(p);
- unsigned int offset = p & ~XEN_PAGE_MASK;
-
- if (offset + size <= XEN_PAGE_SIZE)
- return 0;
- if (check_pages_physically_contiguous(xen_pfn, offset, size))
- return 0;
- return 1;
+ return 0;
}
static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
xen_free_coherent_pages(hwdev, size, ret, (dma_addr_t)phys, attrs);
return NULL;
}
+ SetPageXenRemapped(virt_to_page(ret));
}
memset(ret, 0, size);
return ret;
/* Convert the size to actually allocated. */
size = 1UL << (order + XEN_PAGE_SHIFT);
- if (((dev_addr + size - 1 <= dma_mask)) ||
- range_straddles_page_boundary(phys, size))
+ if (!WARN_ON((dev_addr + size - 1 > dma_mask) ||
+ range_straddles_page_boundary(phys, size)) &&
+ TestClearPageXenRemapped(virt_to_page(vaddr)))
xen_destroy_contiguous_region(phys, order);
xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs);