[v2,0/4] riscv: iommu: Support Svnapot

Message

Xu Lu March 11, 2025, 12:25 p.m. UTC

According to the RISC-V IOMMU hardware spec, the IOMMU implementation
has the same translation process as MMU and supports Svnapot standard
extension as well. These patches add support for Svnapot in the IOMMU
driver to make 64K also an available page size during DMA mapping.

Changes in V2:
1. Supply more details about huge pte issue in follow_page_pte().
2. Fix some style problems.

Xu Lu (4):
  mm/gup: Add huge pte handling logic in follow_page_pte()
  iommu/riscv: Use pte_t to represent page table entry
  iommu/riscv: Introduce IOMMU page table lock
  iommu/riscv: Add support for Svnapot

 arch/riscv/include/asm/pgtable.h |   6 +
 drivers/iommu/riscv/iommu.c      | 258 +++++++++++++++++++++++++------
 include/linux/pgtable.h          |   8 +
 mm/gup.c                         |  17 +-
 4 files changed, 233 insertions(+), 56 deletions(-)