diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/io-pgtable-dart.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/io-pgtable-dart.c b/drivers/iommu/io-pgtable-dart.c index 8ca1ea313a80..fc76b6168055 100644 --- a/drivers/iommu/io-pgtable-dart.c +++ b/drivers/iommu/io-pgtable-dart.c @@ -14,6 +14,7 @@ #define pr_fmt(fmt) "dart io-pgtable: " fmt #include <linux/atomic.h> +#include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/io-pgtable.h> #include <linux/kernel.h> @@ -40,6 +41,9 @@ #define DART_PTES_PER_TABLE(d) \ (DART_GRANULE(d) >> ilog2(sizeof(dart_iopte))) +#define APPLE_DART_PTE_SUBPAGE_START GENMASK_ULL(63, 52) +#define APPLE_DART_PTE_SUBPAGE_END GENMASK_ULL(51, 40) + #define APPLE_DART1_PADDR_MASK GENMASK_ULL(35, 12) /* Apple DART1 protection bits */ @@ -107,6 +111,10 @@ static int dart_init_pte(struct dart_io_pgtable *data, return -EEXIST; } + /* subpage protection: always allow access to the entire page */ + pte |= FIELD_PREP(APPLE_DART_PTE_SUBPAGE_START, 0); + pte |= FIELD_PREP(APPLE_DART_PTE_SUBPAGE_END, 0xfff); + pte |= APPLE_DART1_PTE_PROT_SP_DIS; pte |= APPLE_DART_PTE_VALID; |