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| author | Gary R Hook <gary.hook@amd.com> | 2018-06-12 16:41:21 -0500 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-07-06 14:06:30 +0200 |
| commit | bad614b24293ae463e74d2465685f0e4e229baca (patch) | |
| tree | 5548eef5b84284b0621f60ffdde93c75e92a6241 /include/linux/iommu.h | |
| parent | 021c91791a5e7e85c567452f1be3e4c2c6cb6063 (diff) | |
| download | lwn-bad614b24293ae463e74d2465685f0e4e229baca.tar.gz lwn-bad614b24293ae463e74d2465685f0e4e229baca.zip | |
iommu: Enable debugfs exposure of IOMMU driver internals
Provide base enablement for using debugfs to expose internal data of an
IOMMU driver. When called, create the /sys/kernel/debug/iommu directory.
Emit a strong warning at boot time to indicate that this feature is
enabled.
This function is called from iommu_init, and creates the initial DebugFS
directory. Drivers may then call iommu_debugfs_new_driver_dir() to
instantiate a device-specific directory to expose internal data.
It will return a pointer to the new dentry structure created in
/sys/kernel/debug/iommu, or NULL in the event of a failure.
Since the IOMMU driver can not be removed from the running system, there
is no need for an "off" function.
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 19938ee6eb31..7447b0b0579a 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -698,4 +698,11 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) #endif /* CONFIG_IOMMU_API */ +#ifdef CONFIG_IOMMU_DEBUGFS +extern struct dentry *iommu_debugfs_dir; +void iommu_debugfs_setup(void); +#else +static inline void iommu_debugfs_setup(void) {} +#endif + #endif /* __LINUX_IOMMU_H */ |