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Linux/lib/iommu-helper.c

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  1 /*
  2  * IOMMU helper functions for the free area management
  3  */
  4 
  5 #include <linux/export.h>
  6 #include <linux/bitmap.h>
  7 #include <linux/bug.h>
  8 
  9 int iommu_is_span_boundary(unsigned int index, unsigned int nr,
 10                            unsigned long shift,
 11                            unsigned long boundary_size)
 12 {
 13         BUG_ON(!is_power_of_2(boundary_size));
 14 
 15         shift = (shift + index) & (boundary_size - 1);
 16         return shift + nr > boundary_size;
 17 }
 18 
 19 unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 20                                unsigned long start, unsigned int nr,
 21                                unsigned long shift, unsigned long boundary_size,
 22                                unsigned long align_mask)
 23 {
 24         unsigned long index;
 25 
 26         /* We don't want the last of the limit */
 27         size -= 1;
 28 again:
 29         index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
 30         if (index < size) {
 31                 if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
 32                         /* we could do more effectively */
 33                         start = index + 1;
 34                         goto again;
 35                 }
 36                 bitmap_set(map, index, nr);
 37                 return index;
 38         }
 39         return -1;
 40 }
 41 EXPORT_SYMBOL(iommu_area_alloc);
 42 

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