diff options
| author |   Rob Clark <robdclark@chromium.org> | 2024-12-10 08:51:21 -0800 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2025-01-07 15:44:20 +0000 |
| commit | aff028a8192d056d346541c5fc7d88c0eb43412c (patch) | |
| tree | c5ee7a5c5829a084a4f8c0eb6d6f1b126cbf5a7b /include | |
| parent | iommu/io-pgtable-arm: Re-use the pgtable walk for iova_to_phys (diff) | |
| download | wireguard-linux-aff028a8192d056d346541c5fc7d88c0eb43412c.tar.xz wireguard-linux-aff028a8192d056d346541c5fc7d88c0eb43412c.zip | |
iommu/io-pgtable-arm: Add way to debug pgtable walk
Add an io-pgtable method to walk the pgtable returning the raw PTEs that
would be traversed for a given iova access.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20241210165127.600817-4-robdclark@gmail.com
[will: Removed 'arm_lpae_io_pgtable_walk_data::level' per Mostafa]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/io-pgtable.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index ce86b09ae80f..bba2a51c87d2 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -181,11 +181,21 @@ struct io_pgtable_cfg { }; /** + * struct arm_lpae_io_pgtable_walk_data - information from a pgtable walk + * + * @ptes: The recorded PTE values from the walk + */ +struct arm_lpae_io_pgtable_walk_data { + u64 ptes[4]; +}; + +/** * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers. * * @map_pages: Map a physically contiguous range of pages of the same size. * @unmap_pages: Unmap a range of virtually contiguous pages of the same size. * @iova_to_phys: Translate iova to physical address. + * @pgtable_walk: (optional) Perform a page table walk for a given iova. * * These functions map directly onto the iommu_ops member functions with * the same names. @@ -199,6 +209,7 @@ struct io_pgtable_ops { struct iommu_iotlb_gather *gather); phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, unsigned long iova); + int (*pgtable_walk)(struct io_pgtable_ops *ops, unsigned long iova, void *wd); int (*read_and_clear_dirty)(struct io_pgtable_ops *ops, unsigned long iova, size_t size, unsigned long flags, |