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The functions for iommu/devices/<device>/profiling don't actually have
the word `profiling' in the name, which will be confusing as we add more
files to that directory. Rename them for clarity.
Change-Id: Ic57d9400d8784d2cbd667185c5b2b0e1275461dd
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
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Currently, the device name for the SMMU context bank device is used as
the filename for the IOMMU debug info file. This doesn't work in cases
where multiple domains can be attached to a single SMMU context bank
device (like dynamic domains). Make these filenames unique by appending
a 16-byte uuid to the name.
Change-Id: Ie26ece773bfa2e8c75a329a8cb8461bcd598218e
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
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Currently, debugging IOMMU issues is done via manual instrumentation of
the code or via low-level techniques like using a JTAG debugger.
Introduce a set of library functions and debugfs files to facilitate
interactive debugging and testing.
This patch introduces the basic infrastructure as well an initial
debugfs for:
- viewing IOMMU attachments (domain->dev mappings created by
iommu_attach_device) and resulting attributes (like the base address
of the page tables)
- basic performance profiling
Example usage:
# cd /sys/kernel/debug/iommu/attachments
# cat b40000.qcom,kgsl-iommu:iommu_kgsl_cb2
Domain: 0xffffffc0cb983f00
PT_BASE_ADDR: virt=0xffffffc057eca000 phys=0x00000000d7eca000
# cd /sys/kernel/debug/iommu/tests
# cat soc:qcom,cam_smmu:msm_cam_smmu_cb1/profiling
size iommu_map iommu_unmap
4K 47 us 909 us
64K 97 us 594 us
2M 1536 us 605 us
12M 8737 us 1193 us
20M 26517 us 1121 us
size iommu_map_sg iommu_unmap
64K 31 us 656 us
2M 885 us 600 us
12M 2674 us 687 us
20M 4352 us 1096 us
Change-Id: I1c301eec6e64688831cad80ffd0380743f7f0df6
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
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