mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
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>
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_IOMMU_HELPER_H
|
|
#define _LINUX_IOMMU_HELPER_H
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/kernel.h>
|
|
|
|
static inline unsigned long iommu_device_max_index(unsigned long size,
|
|
unsigned long offset,
|
|
u64 dma_mask)
|
|
{
|
|
if (size + offset > dma_mask)
|
|
return dma_mask - offset + 1;
|
|
else
|
|
return size;
|
|
}
|
|
|
|
static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
|
|
unsigned long shift, unsigned long boundary_size)
|
|
{
|
|
BUG_ON(!is_power_of_2(boundary_size));
|
|
|
|
shift = (shift + index) & (boundary_size - 1);
|
|
return shift + nr > boundary_size;
|
|
}
|
|
|
|
extern 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);
|
|
|
|
static inline unsigned long iommu_num_pages(unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long io_page_size)
|
|
{
|
|
unsigned long size = (addr & (io_page_size - 1)) + len;
|
|
|
|
return DIV_ROUND_UP(size, io_page_size);
|
|
}
|
|
|
|
#endif
|