The original port decoder programming algorithm in the kernel failed to acommodate the corner case of a passthrough port connected to a fan-out port. Use the 5th cxl_test decoder to regression test this scenario.
Reported-by: Bobo WL <lmw.b...@gmail.com> Reported-by: Jonathan Cameron <jonathan.came...@huawei.com> Link: http://lore.kernel.org/r/20221010172057.00001...@huawei.com Tested-by: Alison Schofield <alison.schofi...@intel.com> Signed-off-by: Dan Williams <dan.j.willi...@intel.com> --- test/cxl-create-region.sh | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/test/cxl-create-region.sh b/test/cxl-create-region.sh index 82aad3a7285a..47aed44848ab 100644 --- a/test/cxl-create-region.sh +++ b/test/cxl-create-region.sh @@ -110,6 +110,34 @@ create_subregions() done } +create_single() +{ + # the 5th cxl_test decoder is expected to target a single-port + # host-bridge. Older cxl_test implementations may not define it, + # so skip the test in that case. + decoder=$($CXL list -b cxl_test -D -d root | + jq -r ".[4] | + select(.pmem_capable == true) | + select(.nr_targets == 1) | + .decoder") + + if [[ ! $decoder ]]; then + echo "no single-port host-bridge decoder found, skipping" + return + fi + + region=$($CXL create-region -d "$decoder" | jq -r ".region") + if [[ ! $region ]]; then + echo "failed to create single-port host-bridge region" + err "$LINENO" + fi + + destroy_regions "$region" +} + +# test region creation on devices behind a single-port host-bridge +create_single + # test reading labels directly through cxl-cli readarray -t mems < <("$CXL" list -b cxl_test -M | jq -r '.[].memdev')
