test: add a cxl-create-region test

Add a unit test to exercise the cxl-create-region command with different
combinations of memdevs and decoders, using cxl_test based mocked
devices.

Cc: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

2 files changed, 127 insertions, 0 deletions

diff --git a/test/cxl-create-region.sh b/test/cxl-create-region.sh
new file mode 100644
index 00000000..66df38f4
--- /dev/null
+++ b/test/cxl-create-region.sh
@@ -0,0 +1,125 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2022 Intel Corporation. All rights reserved.
+
+. $(dirname $0)/common
+
+rc=1
+
+set -ex
+
+trap 'err $LINENO' ERR
+
+check_prereq "jq"
+
+modprobe -r cxl_test
+modprobe cxl_test
+udevadm settle
+
+destroy_regions()
+{
+	if [[ "$*" ]]; then
+		$CXL destroy-region -f -b cxl_test "$@"
+	else
+		$CXL destroy-region -f -b cxl_test all
+	fi
+}
+
+create_x1_region()
+{
+	mem="$1"
+
+	# find a pmem capable root decoder for this mem
+	decoder=$($CXL list -b cxl_test -D -d root -m "$mem" |
+		  jq -r ".[] |
+		  select(.pmem_capable == true) |
+		  select(.nr_targets == 1) |
+		  .decoder")
+
+	if [[ ! $decoder ]]; then
+		echo "no suitable decoder found for $mem, skipping"
+		return
+	fi
+
+	# create region
+	region=$($CXL create-region -d "$decoder" -m "$mem" | jq -r ".region")
+
+	if [[ ! $region ]]; then
+		echo "create-region failed for $decoder / $mem"
+		err "$LINENO"
+	fi
+
+	# cycle disable/enable
+	$CXL disable-region --bus=cxl_test "$region"
+	$CXL enable-region --bus=cxl_test "$region"
+
+	# cycle destroying and creating the same region
+	destroy_regions "$region"
+	region=$($CXL create-region -d "$decoder" -m "$mem" | jq -r ".region")
+
+	if [[ ! $region ]]; then
+		echo "create-region failed for $decoder / $mem"
+		err "$LINENO"
+	fi
+	destroy_regions "$region"
+}
+
+create_subregions()
+{
+	slice=$((256 << 20))
+	mem="$1"
+
+	# find a pmem capable root decoder for this mem
+	decoder=$($CXL list -b cxl_test -D -d root -m "$mem" |
+		  jq -r ".[] |
+		  select(.pmem_capable == true) |
+		  select(.nr_targets == 1) |
+		  .decoder")
+
+	if [[ ! $decoder ]]; then
+		echo "no suitable decoder found for $mem, skipping"
+		return
+	fi
+
+	size="$($CXL list -m "$mem" | jq -r '.[].pmem_size')"
+	if [[ ! $size ]]; then
+		echo "$mem: unable to determine size"
+		err "$LINENO"
+	fi
+
+	num_regions=$((size / slice))
+
+	declare -a regions
+	for (( i = 0; i < num_regions; i++ )); do
+		regions[$i]=$($CXL create-region -d "$decoder" -m "$mem" -s "$slice" | jq -r ".region")
+		if [[ ! ${regions[$i]} ]]; then
+			echo "create sub-region failed for $decoder / $mem"
+			err "$LINENO"
+		fi
+		udevadm settle
+	done
+
+	echo "created $num_regions subregions:"
+	for (( i = 0; i < num_regions; i++ )); do
+		echo "${regions[$i]}"
+	done
+
+	for (( i = (num_regions - 1); i >= 0; i-- )); do
+		destroy_regions "${regions[$i]}"
+	done
+}
+
+# test reading labels directly through cxl-cli
+readarray -t mems < <("$CXL" list -b cxl_test -M | jq -r '.[].memdev')
+
+for mem in ${mems[@]}; do
+	create_x1_region "$mem"
+done
+
+# test multiple subregions under the same decoder, using slices of the same memdev
+# to test out back-to-back pmem DPA allocations on memdevs
+for mem in ${mems[@]}; do
+	create_subregions "$mem"
+done
+
+modprobe -r cxl_test
diff --git a/test/meson.build b/test/meson.build
index b382f46b..5953c286 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -153,6 +153,7 @@ track_uuid = find_program('track-uuid.sh')
 cxl_topo = find_program('cxl-topology.sh')
 cxl_sysfs = find_program('cxl-region-sysfs.sh')
 cxl_labels = find_program('cxl-labels.sh')
+cxl_create_region = find_program('cxl-create-region.sh')
 
 tests = [
   [ 'libndctl',               libndctl,		  'ndctl' ],
@@ -180,6 +181,7 @@ tests = [
   [ 'cxl-topology.sh',	      cxl_topo,		  'cxl'   ],
   [ 'cxl-region-sysfs.sh',    cxl_sysfs,	  'cxl'   ],
   [ 'cxl-labels.sh',          cxl_labels,	  'cxl'   ],
+  [ 'cxl-create-region.sh',   cxl_create_region,  'cxl'   ],
 ]
 
 if get_option('destructive').enabled()