These patches create a top-level function, called at IOMMU initialization, to create a debugfs directory for the IOMMU. Under this directory drivers may create and populate-specific directories for their device internals.
Patch 1: general IOMMU enablement Patch 2: basic AMD enablement to demonstrate linkage with patch 1 Introduce a new Kconfig parameter IOMMU_DEBUGFS to globally allow/disallow debugfs code to be built. The Makefile structure is intended to allow the use of a single switch for turning on DebugFS. Changes since v6: - Rely on default Kconfig value for a bool - comment/doc fixes - use const where appropriate - fix inline declaration Changes since v5: - Added parameters names in declarations/definitions - Reformatted an inline definition Changes since v4: - Guard vendor-specific debugfs files in the Makefile - Call top-level routine from iommu_init() - Add function for instantiating a driver-specific directory - Change AMD driver code to use this new format Changes since v3: - Remove superfluous calls to debugfs_initialized() - Emit a warning exactly one time - Change the Kconfig name to IOMMU_DEBUGFS - Change the way debugfs modules are made Changes since v2: - Move a declaration to outside an ifdef - Remove a spurious blank line Changes since v1: - Remove debug cruft - Remove cruft produced by design change - Change the lock to a mutex - Coding style fixes - Add a comment to document the framework --- Gary R Hook (2): iommu - Enable debugfs exposure of IOMMU driver internals iommu/amd: Add basic debugfs infrastructure for AMD IOMMU drivers/iommu/Kconfig | 10 +++++ drivers/iommu/Makefile | 6 +++ drivers/iommu/amd_iommu_debugfs.c | 39 ++++++++++++++++++++ drivers/iommu/amd_iommu_init.c | 6 ++- drivers/iommu/amd_iommu_proto.h | 6 +++ drivers/iommu/amd_iommu_types.h | 3 ++ drivers/iommu/iommu-debugfs.c | 72 +++++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 2 + include/linux/iommu.h | 11 ++++++ 9 files changed, 153 insertions(+), 2 deletions(-) create mode 100644 drivers/iommu/amd_iommu_debugfs.c create mode 100644 drivers/iommu/iommu-debugfs.c --