[ndctl PATCH] cxl/test: Add 3-way HB interleave testcase to cxl-xor-region.sh

[alison.schofield@intel.com]

From: Alison Schofield <alison.schofield@intel.com>

cxl-xor-region.sh includes test cases for 1 & 2 way host bridge
interleaves. Add a new test case to exercise the modulo math
function the CXL driver uses to find positions in a 3-way host
bridge interleave.

Skip this test case, don't fail, if the new 3-way XOR decoder
is not present in cxl/test.

Add the missing check_dmesg helper before exiting this test.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
---
 test/cxl-xor-region.sh | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/test/cxl-xor-region.sh b/test/cxl-xor-region.sh
index 117e7a4bba61..2f3b4aa5208a 100644
--- a/test/cxl-xor-region.sh
+++ b/test/cxl-xor-region.sh
@@ -86,11 +86,44 @@ setup_x4()
         memdevs="$mem0 $mem1 $mem2 $mem3"
 }
 
+setup_x3()
+{
+        # find an x3 decoder
+        decoder=$($CXL list -b cxl_test -D -d root | jq -r ".[] |
+          select(.pmem_capable == true) |
+          select(.nr_targets == 3) |
+          .decoder")
+
+	if [[ ! $decoder ]]; then
+		echo "no x3 decoder found, skipping xor-x3 test"
+		return
+	fi
+
+        # Find a memdev for each host-bridge interleave position
+        port_dev0=$($CXL list -T -d "$decoder" | jq -r ".[] |
+            .targets | .[] | select(.position == 0) | .target")
+        port_dev1=$($CXL list -T -d "$decoder" | jq -r ".[] |
+            .targets | .[] | select(.position == 1) | .target")
+        port_dev2=$($CXL list -T -d "$decoder" | jq -r ".[] |
+            .targets | .[] | select(.position == 2) | .target")
+	mem0=$($CXL list -M -p "$port_dev0" | jq -r ".[0].memdev")
+	mem1=$($CXL list -M -p "$port_dev1" | jq -r ".[0].memdev")
+	mem2=$($CXL list -M -p "$port_dev2" | jq -r ".[0].memdev")
+	memdevs="$mem0 $mem1 $mem2"
+}
+
 setup_x1
 create_and_destroy_region
 setup_x2
 create_and_destroy_region
 setup_x4
 create_and_destroy_region
+# x3 decoder may not be available in cxl/test topo yet
+setup_x3
+if [[ $decoder ]]; then
+	create_and_destroy_region
+fi
+
+check_dmesg "$LINENO"
 
 modprobe -r cxl_test
-- 
2.37.3