diff options
Diffstat (limited to 'include/linux/io-pgtable.h')
| -rw-r--r-- | include/linux/io-pgtable.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index ce86b09ae80f..138fbd89b1e6 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -88,6 +88,13 @@ struct io_pgtable_cfg { * * IO_PGTABLE_QUIRK_ARM_HD: Enables dirty tracking in stage 1 pagetable. * IO_PGTABLE_QUIRK_ARM_S2FWB: Use the FWB format for the MemAttrs bits + * + * IO_PGTABLE_QUIRK_NO_WARN: Do not WARN_ON() on conflicting + * mappings, but silently return -EEXISTS. Normally an attempt + * to map over an existing mapping would indicate some sort of + * kernel bug, which would justify the WARN_ON(). But for GPU + * drivers, this could be under control of userspace. Which + * deserves an error return, but not to spam dmesg. */ #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) @@ -97,6 +104,7 @@ struct io_pgtable_cfg { #define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6) #define IO_PGTABLE_QUIRK_ARM_HD BIT(7) #define IO_PGTABLE_QUIRK_ARM_S2FWB BIT(8) + #define IO_PGTABLE_QUIRK_NO_WARN BIT(9) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias; @@ -181,11 +189,21 @@ 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 +217,7 @@ 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, |