mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 08:44:14 +08:00
79c1879ee5
This avoids selecting IOMMU_HELPER just for this function. And we only use it once or twice in normal builds so this often even is a size reduction. Signed-off-by: Christoph Hellwig <hch@lst.de>
30 lines
755 B
C
30 lines
755 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* IOMMU helper functions for the free area management
|
|
*/
|
|
|
|
#include <linux/bitmap.h>
|
|
#include <linux/iommu-helper.h>
|
|
|
|
unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
|
|
unsigned long start, unsigned int nr,
|
|
unsigned long shift, unsigned long boundary_size,
|
|
unsigned long align_mask)
|
|
{
|
|
unsigned long index;
|
|
|
|
/* We don't want the last of the limit */
|
|
size -= 1;
|
|
again:
|
|
index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
|
|
if (index < size) {
|
|
if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
|
|
start = ALIGN(shift + index, boundary_size) - shift;
|
|
goto again;
|
|
}
|
|
bitmap_set(map, index, nr);
|
|
return index;
|
|
}
|
|
return -1;
|
|
}
|