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3 commits

Author SHA1 Message Date
Lu Baolu
456bb0b97f iommu/vt-d: Expose latency monitor data through debugfs 
A debugfs interface /sys/kernel/debug/iommu/intel/dmar_perf_latency is
created to control and show counts of execution time ranges for various
types per DMAR. The interface may help debug any potential performance
issue.

By default, the interface is disabled.

Possible write value of /sys/kernel/debug/iommu/intel/dmar_perf_latency
  0 - disable sampling all latency data
  1 - enable sampling IOTLB invalidation latency data
  2 - enable sampling devTLB invalidation latency data
  3 - enable sampling intr entry cache invalidation latency data
  4 - enable sampling prq handling latency data

Read /sys/kernel/debug/iommu/intel/dmar_perf_latency gives a snapshot
of sampling result of all enabled monitors.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210520031531.712333-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210610020115.1637656-15-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-06-10 09:06:13 +02:00
Lu Baolu
02f3effddf iommu/vt-d: Rename intel-pasid.h to pasid.h 
As Intel VT-d files have been moved to its own subdirectory, the prefix
makes no sense. No functional changes.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200724014925.15523-13-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2020-07-24 10:51:21 +02:00
Joerg Roedel
672cf6df9b iommu/vt-d: Move Intel IOMMU driver into subdirectory 
Move all files related to the Intel IOMMU driver into its own
subdirectory.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200609130303.26974-3-joro@8bytes.org
 2020-06-10 17:46:43 +02:00
Renamed from drivers/iommu/intel-iommu-debugfs.c (Browse further)