mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.1 KiB
44 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _LINUX_IOMMU_HELPER_H |
|
#define _LINUX_IOMMU_HELPER_H |
|
|
|
#include <linux/bug.h> |
|
#include <linux/log2.h> |
|
#include <linux/math.h> |
|
#include <linux/types.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
|
|
|