[0/3] Enhancing Device Identification in RISC-V IOMMU Using Memory Attributes

Message

Jason Chien March 2, 2025, 9:12 a.m. UTC

This patch series enhances how device IDs are handled in RISC-V IOMMU by
leveraging memory attributes.

The BDF (Bus-Device-Function) is now included in memory attributes for
DMA operations, ensuring accurate device identification.

Since PCIe bus numbers can change after re-enumeration, relying on static
device IDs in RISCVIOMMUSpace may lead to incorrect Device Directory Table
walk. The IOMMU now dynamically retrieves latest device IDs from memory
attributes.

The bus property, previously used to set non-root endpoint bus numbers,
is removed. As PCIe bus numbers are assigned at runtime and vary across
endpoints, exposing a single property to pre-set them is unnecessary and
incorrect. With device IDs now retrieved dynamically, this property is no
longer required.

Jason Chien (3):
  include/hw/pci: Attach BDF to Memory Attributes
  hw/riscv/riscv-iommu: Obtain Device IDs from Memory Attributes
  hw/riscv/riscv_iommu: Remove the "bus" property

 hw/riscv/riscv-iommu.c      | 15 +++++++--------
 hw/riscv/riscv-iommu.h      |  1 -
 include/hw/pci/pci_device.h | 10 ++++++++--
 3 files changed, 15 insertions(+), 11 deletions(-)