iommu/amd: Introduce first_pte_l7() helper

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Given an arbitrary pte that is part of a large mapping, this function
returns the first pte of the series (and optionally the mapped size and
number of PTEs)
It will be re-used in a subsequent patch to replace an existing L7
mapping.

Fixes: 6d568ef9a6 ("iommu/amd: Allow downgrading page-sizes in alloc_pte()")
Signed-off-by: Andrei Dulea <adulea@amazon.de>

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Andrei Dulea 2019-09-13 16:42:30 +02:00 • committed by Joerg Roedel

parent 6ccb72f837

commit 7f1f1683c1

1 changed files with 29 additions and 11 deletions

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drivers/iommu/amd_iommu.c

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