Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_IOMMU_HELPER_H
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#define _LINUX_IOMMU_HELPER_H
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#include <linux/bug.h>
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#include <linux/log2.h>
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#include <linux/math.h>
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#include <linux/types.h>
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static inline unsigned long iommu_device_max_index(unsigned long size,
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unsigned long offset,
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u64 dma_mask)
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{
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if (size + offset > dma_mask)
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return dma_mask - offset + 1;
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else
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return size;
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}
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static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
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unsigned long shift, unsigned long boundary_size)
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{
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BUG_ON(!is_power_of_2(boundary_size));
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shift = (shift + index) & (boundary_size - 1);
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return shift + nr > boundary_size;
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}
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extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
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unsigned long start, unsigned int nr,
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unsigned long shift,
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unsigned long boundary_size,
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unsigned long align_mask);
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static inline unsigned long iommu_num_pages(unsigned long addr,
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unsigned long len,
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unsigned long io_page_size)
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{
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unsigned long size = (addr & (io_page_size - 1)) + len;
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return DIV_ROUND_UP(size, io_page_size);
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}
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#endif
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