cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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iommu-helper.h (1146B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_IOMMU_HELPER_H
      3#define _LINUX_IOMMU_HELPER_H
      4
      5#include <linux/bug.h>
      6#include <linux/log2.h>
      7#include <linux/math.h>
      8#include <linux/types.h>
      9
     10static inline unsigned long iommu_device_max_index(unsigned long size,
     11						   unsigned long offset,
     12						   u64 dma_mask)
     13{
     14	if (size + offset > dma_mask)
     15		return dma_mask - offset + 1;
     16	else
     17		return size;
     18}
     19
     20static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
     21		unsigned long shift, unsigned long boundary_size)
     22{
     23	BUG_ON(!is_power_of_2(boundary_size));
     24
     25	shift = (shift + index) & (boundary_size - 1);
     26	return shift + nr > boundary_size;
     27}
     28
     29extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
     30				      unsigned long start, unsigned int nr,
     31				      unsigned long shift,
     32				      unsigned long boundary_size,
     33				      unsigned long align_mask);
     34
     35static inline unsigned long iommu_num_pages(unsigned long addr,
     36					    unsigned long len,
     37					    unsigned long io_page_size)
     38{
     39	unsigned long size = (addr & (io_page_size - 1)) + len;
     40
     41	return DIV_ROUND_UP(size, io_page_size);
     42}
     43
     44#endif