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authorGary R Hook <gary.hook@amd.com>2018-06-12 16:41:21 -0500
committerJoerg Roedel <jroedel@suse.de>2018-07-06 14:06:30 +0200
commitbad614b24293ae463e74d2465685f0e4e229baca (patch)
tree5548eef5b84284b0621f60ffdde93c75e92a6241 /include
parent021c91791a5e7e85c567452f1be3e4c2c6cb6063 (diff)
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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')
-rw-r--r--include/linux/iommu.h7
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 */