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 vendor-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 v7:
- Change the Kconfig approach to use a hidden boolean for a
specific device
- Change some #ifdefs to reference the new boolean
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 | 14 +++++++
drivers/iommu/Makefile | 2 +
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 | 5 +++
drivers/iommu/iommu-debugfs.c | 72 +++++++++++++++++++++++++++++++++++++
drivers/iommu/iommu.c | 2 +
include/linux/iommu.h | 11 ++++++
9 files changed, 155 insertions(+), 2 deletions(-)
create mode 100644 drivers/iommu/amd_iommu_debugfs.c
create mode 100644 drivers/iommu/iommu-debugfs.c
--
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