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Runtime Instrumentation Testing - N1SDP
=======================================
For this test we used the N1 System Development Platform (`N1SDP`_), which
contains an SoC consisting of two dual-core Arm N1 clusters.
The following source trees and binaries were used:
- TF-A [`v2.9-rc0-16-g666aec401`_]
- TFTF [`v2.9-rc0`_]
- SCP/MCP `Prebuilt Images`_
Please see the Runtime Instrumentation `Testing Methodology`_ page for more
details.
Procedure
---------
#. Build TFTF with runtime instrumentation enabled:
.. code:: shell
make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
TESTS=runtime-instrumentation all
#. Build TF-A with the following build options:
.. code:: shell
make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
ENABLE_RUNTIME_INSTRUMENTATION=1 fiptool all
#. Fetch the SCP firmware images:
.. code:: shell
curl --fail --connect-timeout 5 --retry 5 \
-sLS -o build/n1sdp/release/scp_rom.bin \
https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-bl1.bin
curl --fail --connect-timeout 5 \
--retry 5 -sLS -o build/n1sdp/release/scp_ram.bin \
https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-bl2.bin
#. Fetch the MCP firmware images:
.. code:: shell
curl --fail --connect-timeout 5 --retry 5 \
-sLS -o build/n1sdp/release/mcp_rom.bin \
https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-mcp-bl1.bin
curl --fail --connect-timeout 5 --retry 5 \
-sLS -o build/n1sdp/release/mcp_ram.bin \
https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-mcp-bl2.bin
#. Using the fiptool, create a new FIP package and append the SCP ram image onto
it.
.. code:: shell
./tools/fiptool/fiptool create --blob \
uuid=cfacc2c4-15e8-4668-82be-430a38fad705,file=build/n1sdp/release/bl1.bin \
--scp-fw build/n1sdp/release/scp_ram.bin build/n1sdp/release/scp_fw.bin
#. Append the MCP image to the FIP.
.. code:: shell
./tools/fiptool/fiptool create \
--blob uuid=54464222-a4cf-4bf8-b1b6-cee7dade539e,file=build/n1sdp/release/mcp_ram.bin \
build/n1sdp/release/mcp_fw.bin
#. Then, add TFTF as the Non-Secure workload in the FIP image:
.. code:: shell
make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
ENABLE_RUNTIME_INSTRUMENTATION=1 SCP_BL2=/dev/null \
BL33=<path/to/tftf.bin> fip
#. Load the following images onto the development board: ``fip.bin``,
``scp_rom.bin``, ``scp_ram.bin``, ``mcp_rom.bin``, and ``mcp_ram.bin``.
.. note::
These instructions presume you have a complete firmware stack. The N1SDP
`user guide`_ provides a detailed explanation on how to get setup from
scratch.
Results
-------
``CPU_SUSPEND`` to deepest power level
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. table:: ``CPU_SUSPEND`` latencies s) to deepest power level in
parallel
+---------+------+-----------+---------+-------------+
| Cluster | Core | Powerdown | Wakekup | Cache Flush |
+=========+======+===========+=========+=============+
| 0 | 0 | 3.44 | 10.04 | 0.4 |
+---------+------+-----------+---------+-------------+
| 0 | 1 | 4.98 | 12.72 | 0.16 |
+---------+------+-----------+---------+-------------+
| 1 | 0 | 3.58 | 15.42 | 0.2 |
+---------+------+-----------+---------+-------------+
| 1 | 1 | 5.24 | 17.78 | 0.18 |
+---------+------+-----------+---------+-------------+
.. table:: ``CPU_SUSPEND`` latencies s) to deepest power level in
serial
+---------+------+-----------+---------+-------------+
| Cluster | Core | Powerdown | Wakekup | Cache Flush |
+=========+======+===========+=========+=============+
| 0 | 0 | 1.82 | 9.98 | 0.32 |
+---------+------+-----------+---------+-------------+
| 0 | 1 | 1.96 | 9.96 | 0.18 |
+---------+------+-----------+---------+-------------+
| 1 | 0 | 2.0 | 10.5 | 0.16 |
+---------+------+-----------+---------+-------------+
| 1 | 1 | 2.22 | 10.56 | 0.16 |
+---------+------+-----------+---------+-------------+
``CPU_SUSPEND`` to power level 0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. table:: ``CPU_SUSPEND`` latencies s) to power level 0 in
parallel
+---------+------+-----------+---------+-------------+
| Cluster | Core | Powerdown | Wakekup | Cache Flush |
+=========+======+===========+=========+=============+
| 0 | 0 | 1.52 | 11.84 | 0.34 |
+---------+------+-----------+---------+-------------+
| 0 | 1 | 1.1 | 13.66 | 0.14 |
+---------+------+-----------+---------+-------------+
| 1 | 0 | 2.18 | 9.48 | 0.18 |
+---------+------+-----------+---------+-------------+
| 1 | 1 | 2.06 | 14.4 | 0.16 |
+---------+------+-----------+---------+-------------+
.. table:: ``CPU_SUSPEND`` latencies s) to power level 0 in serial
+---------+------+-----------+---------+-------------+
| Cluster | Core | Powerdown | Wakekup | Cache Flush |
+=========+======+===========+=========+=============+
| 0 | 0 | 1.54 | 9.34 | 0.3 |
+---------+------+-----------+---------+-------------+
| 0 | 1 | 1.88 | 9.5 | 0.16 |
+---------+------+-----------+---------+-------------+
| 1 | 0 | 1.86 | 9.86 | 0.2 |
+---------+------+-----------+---------+-------------+
| 1 | 1 | 2.02 | 9.64 | 0.18 |
+---------+------+-----------+---------+-------------+
``CPU_OFF`` on all non-lead CPUs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
``CPU_OFF`` on all non-lead CPUs in sequence then, ``CPU_SUSPEND`` on the lead
core to the deepest power level.
.. table:: ``CPU_OFF`` latencies s) on all non-lead CPUs
+---------+------+-----------+---------+-------------+
| Cluster | Core | Powerdown | Wakekup | Cache Flush |
+=========+======+===========+=========+=============+
| 0 | 0 | 1.86 | 9.88 | 0.32 |
+---------+------+-----------+---------+-------------+
| 0 | 1 | 21.1 | 12.44 | 0.42 |
+---------+------+-----------+---------+-------------+
| 1 | 0 | 21.22 | 13.2 | 0.32 |
+---------+------+-----------+---------+-------------+
| 1 | 1 | 21.56 | 13.18 | 0.54 |
+---------+------+-----------+---------+-------------+
``CPU_VERSION`` in parallel
~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. table:: ``CPU_VERSION`` latency s) in parallel on all cores
+-------------+--------+--------------+
| Cluster | Core | Latency |
+=============+========+==============+
| 0 | 0 | 0.08 |
+-------------+--------+--------------+
| 0 | 1 | 0.22 |
+-------------+--------+--------------+
| 1 | 0 | 0.28 |
+-------------+--------+--------------+
| 1 | 1 | 0.26 |
+-------------+--------+--------------+
--------------
*Copyright (c) 2023, Arm Limited. All rights reserved.*
.. _v2.9-rc0-16-g666aec401: https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/heads/v2.9-rc0-16-g666aec401
.. _v2.9-rc0: https://review.trustedfirmware.org/plugins/gitiles/TF-A/tf-a-tests/+/refs/tags/v2.9-rc0
.. _user guide: https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/blob/master/docs/n1sdp/user-guide.rst
.. _Prebuilt Images: https://downloads.trustedfirmware.org/tf-a/css_scp_2.11.0/n1sdp/release/
.. _N1SDP: https://developer.arm.com/documentation/101489/latest
.. _Testing Methodology: ../perf/psci-performance-methodology.html