u-boot-brain/test
Etienne Carriere 358599efd8 firmware: add SCMI agent uclass
This change introduces SCMI agent uclass to interact with a firmware
using the SCMI protocols [1].

SCMI agent uclass currently supports a single method to request
processing of the SCMI message by an identified server. A SCMI message
is made of a byte payload associated to a protocol ID and a message ID,
all defined by the SCMI specification [1]. On return from process_msg()
method, the caller gets the service response.

SCMI agent uclass defines a post bind generic sequence for all devices.
The sequence binds all the SCMI protocols listed in the FDT for that
SCMI agent device. Currently none, but later change will introduce
protocols.

This change implements a simple sandbox device for the SCMI agent uclass.
The sandbox nicely answers SCMI_NOT_SUPPORTED to SCMI messages.
To prepare for further test support, the sandbox exposes a architecture
function for test application to read the sandbox emulated devices state.
Currently supports 2 SCMI agents, identified by an ID in the FDT device
name. The simplistic DM test does nothing yet.

SCMI agent uclass is designed for platforms that embed a SCMI server in
a firmware hosted somewhere, for example in a companion co-processor or
in the secure world of the executing processor. SCMI protocols allow an
SCMI agent to discover and access external resources as clock, reset
controllers and more. SCMI agent and server communicate following the
SCMI specification [1]. This SCMI agent implementation complies with
the DT bindings defined in the Linux kernel source tree regarding
SCMI agent description since v5.8.

Links: [1] https://developer.arm.com/architectures/system-architectures/software-standards/scmi
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-09-30 11:55:23 -04:00
..
cmd cmd: Update the memory-search command 2020-08-07 22:31:32 -04:00
dm firmware: add SCMI agent uclass 2020-09-30 11:55:23 -04:00
env common: Drop log.h from common header 2020-05-18 21:19:18 -04:00
fs Consistently use nproc for counting the CPUs 2020-01-30 13:30:35 -05:00
image test: Update test-imagetools.sh to match new syntax 2019-03-08 11:31:44 -05:00
lib test: undefined reference to 'sscanf' 2020-08-27 11:26:58 -04:00
log log: don't show function by default 2020-07-09 18:57:22 -06:00
optee common: Drop log.h from common header 2020-05-18 21:19:18 -04:00
overlay common: Drop log.h from common header 2020-05-18 21:19:18 -04:00
py test/py: allow multi-digit index in in_tree() 2020-09-30 11:55:23 -04:00
stdint Remove <inttypes.h> includes and PRI* usages in printf() entirely 2018-09-10 20:48:17 -04:00
trace SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
bloblist.c command: Remove the cmd_tbl_t typedef 2020-05-18 18:36:55 -04:00
cmd_ut.c cmd: Update the memory-search command 2020-08-07 22:31:32 -04:00
command_ut.c common: Drop log.h from common header 2020-05-18 21:19:18 -04:00
common.sh Consistently use nproc for counting the CPUs 2020-01-30 13:30:35 -05:00
compression.c test: Use ut_asserteq_mem() where possible 2020-05-19 14:01:47 -04:00
Kconfig test: log functions with CONFIG_LOG=n 2020-04-16 08:07:58 -06:00
Makefile cmd: Add a memory-search command 2020-07-08 17:21:46 -04:00
nokia_rx51_test.sh Nokia RX-51: Add automated test for running RX-51 build in qemu 2020-05-19 14:41:04 +05:30
print_ut.c common: Drop log.h from common header 2020-05-18 21:19:18 -04:00
README test: Add a 'make qcheck' target for quicker testing 2018-11-29 09:30:05 -07:00
run patman: Add a 'test' subcommand 2020-07-24 19:25:15 -06:00
str_ut.c command: Remove the cmd_tbl_t typedef 2020-05-18 18:36:55 -04:00
time_ut.c common: Drop linux/delay.h from common header 2020-05-18 21:19:23 -04:00
unicode_ut.c test: Use ut_asserteq_mem() where possible 2020-05-19 14:01:47 -04:00
ut.c test: Add a way to check part of a console line or skip it 2020-08-07 22:31:32 -04:00

Testing in U-Boot
=================

U-Boot has a large amount of code. This file describes how this code is
tested and what tests you should write when adding a new feature.


Running tests
-------------

To run most tests on sandbox, type this:

    make check

in the U-Boot directory. Note that only the pytest suite is run using this
command.

Some tests take ages to run. To run just the quick ones, type this:

    make qcheck


Sandbox
-------
U-Boot can be built as a user-space application (e.g. for Linux). This
allows test to be executed without needing target hardware. The 'sandbox'
target provides this feature and it is widely used in tests.


Pytest Suite
------------

Many tests are available using the pytest suite, in test/py. This can run
either on sandbox or on real hardware. It relies on the U-Boot console to
inject test commands and check the result. It is slower to run than C code,
but provides the ability to unify lots of tests and summarise their results.

You can run the tests on sandbox with:

	./test/py/test.py --bd sandbox --build

This will produce HTML output in build-sandbox/test-log.html

See test/py/README.md for more information about the pytest suite.


tbot
----

Tbot provides a way to execute tests on target hardware. It is intended for
trying out both U-Boot and Linux (and potentially other software) on a
number of boards automatically. It can be used to create a continuous test
environment. See http://www.tbot.tools for more information.


Ad-hoc tests
------------

There are several ad-hoc tests which run outside the pytest environment:

   test/fs	- File system test (shell script)
   test/image	- FIT and legacy image tests (shell script and Python)
   test/stdint	- A test that stdint.h can be used in U-Boot (shell script)
   trace	- Test for the tracing feature (shell script)

TODO: Move these into pytest.


When to write tests
-------------------

If you add code to U-Boot without a test you are taking a risk. Even if you
perform thorough manual testing at the time of submission, it may break when
future changes are made to U-Boot. It may even break when applied to mainline,
if other changes interact with it. A good mindset is that untested code
probably doesn't work and should be deleted.

You can assume that the Pytest suite will be run before patches are accepted
to mainline, so this provides protection against future breakage.

On the other hand there is quite a bit of code that is not covered with tests,
or is covered sparingly. So here are some suggestions:

- If you are adding a new uclass, add a sandbox driver and a test that uses it
- If you are modifying code covered by an existing test, add a new test case
  to cover your changes
- If the code you are modifying has not tests, consider writing one. Even a
  very basic test is useful, and may be picked up and enhanced by others. It
  is much easier to add onto a test - writing a new large test can seem
  daunting to most contributors.


Future work
-----------

Converting existing shell scripts into pytest tests.