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SubjectRe: [PATCH v2 16/23] test_firmware: enable custom fallback testing on limited kernel configs
On Mon, Nov 20, 2017 at 10:24:02AM -0800, Luis R. Rodriguez wrote:
> When a kernel is not built with:
>
> CONFIG_HAS_FW_LOADER_USER_HELPER_FALLBACK=y
>
> We don't currently enable testing fw_fallback.sh. For kernels that
> still enable the fallback mechanism, its possible to use the async
> request firmware API call request_firmware_nowait() using the custom
> interface to use the fallback mechanism, so we should be able to test
> this but we currently cannot.
>
> We can enable testing without CONFIG_HAS_FW_LOADER_USER_HELPER_FALLBACK=y
> by relying on /proc/config.gz (CONFIG_IKCONFIG_PROC), if present. If you
> don't have this we'll have no option but to rely on old heuristics for now.
>
> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
> ---
> tools/testing/selftests/firmware/config | 4 +++
> tools/testing/selftests/firmware/fw_fallback.sh | 45 ++++++++++++++++++++++++-
> 2 files changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/firmware/config b/tools/testing/selftests/firmware/config
> index c8137f70e291..bf634dda0720 100644
> --- a/tools/testing/selftests/firmware/config
> +++ b/tools/testing/selftests/firmware/config
> @@ -1 +1,5 @@
> CONFIG_TEST_FIRMWARE=y
> +CONFIG_FW_LOADER=y
> +CONFIG_FW_LOADER_USER_HELPER=y
> +CONFIG_IKCONFIG=y
> +CONFIG_IKCONFIG_PROC=y
> diff --git a/tools/testing/selftests/firmware/fw_fallback.sh b/tools/testing/selftests/firmware/fw_fallback.sh
> index 722cad91df74..a42e437363d9 100755
> --- a/tools/testing/selftests/firmware/fw_fallback.sh
> +++ b/tools/testing/selftests/firmware/fw_fallback.sh
> @@ -6,7 +6,46 @@
> # won't find so that we can do the load ourself manually.
> set -e
>
> +PROC_CONFIG="/proc/config.gz"
> +TEST_DIR=$(dirname $0)
> +
> modprobe test_firmware
> +if [ ! -f $PROC_CONFIG ]; then
> + if modprobe configs 2>/dev/null; then
> + echo "Loaded configs module"
> + if [ ! -f $PROC_CONFIG ]; then
> + echo "You must have the following enabled in your kernel:" >&2
> + cat $TEST_DIR/config >&2
> + echo "Resorting to old heuristics" >&2
> + fi
> + else
> + echo "Failed to load configs module, using old heuristics" >&2
> + fi
> +fi
> +
> +kconfig_has()
> +{
> + if [ -f $PROC_CONFIG ]; then
> + if zgrep -q $1 $PROC_CONFIG 2>/dev/null; then
> + echo "yes"
> + else
> + echo "no"
> + fi
> + else
> + # We currently don't have easy heuristics to infer this
> + # so best we can do is just try to use the kernel assuming
> + # you had enabled it. This matches the old behaviour.
> + if [ "$1" = "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y" ]; then
> + echo "yes"
> + elif [ "$1" = "CONFIG_FW_LOADER_USER_HELPER=y" ]; then
> + if [ -d /sys/class/firmware/ ]; then
> + echo yes
> + else
> + echo no
> + fi
> + fi
> + fi
> +}

Shouldn't these functions be part of the kselftest core so that all
tests can take advantage of them instead of having to hand-roll them for
every individual test?

And is there no way at runtime to tell what the options are and just
not run that type of test?

thanks,

greg k-h

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