diff options
Diffstat (limited to 'drivers/iommu/io-pgtable.h')
| -rw-r--r-- | drivers/iommu/io-pgtable.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h index 969d82cc92ca..524263a7ae6f 100644 --- a/drivers/iommu/io-pgtable.h +++ b/drivers/iommu/io-pgtable.h @@ -65,11 +65,17 @@ struct io_pgtable_cfg { * PTEs, for Mediatek IOMMUs which treat it as a 33rd address bit * when the SoC is in "4GB mode" and they can only access the high * remap of DRAM (0x1_00000000 to 0x1_ffffffff). + * + * IO_PGTABLE_QUIRK_NO_DMA: Guarantees that the tables will only ever + * be accessed by a fully cache-coherent IOMMU or CPU (e.g. for a + * software-emulated IOMMU), such that pagetable updates need not + * be treated as explicit DMA data. */ #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) #define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2) #define IO_PGTABLE_QUIRK_ARM_MTK_4GB BIT(3) + #define IO_PGTABLE_QUIRK_NO_DMA BIT(4) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias; |