From ef85ab79e7a45d19ca329c6e4cad9881a5a904e9 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Thu, 28 Apr 2022 15:10:54 -0700
Subject: [PATCH 165/217] cxl/test: Add topology enumeration and hotplug test
Test the re-plug of memdevs, switch ports, root ports, and bus objects.
Link: https://lore.kernel.org/r/165118385401.1676208.9224280236045777443.stgit@dwillia2-desk3.amr.corp.intel.com
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
test/common | 12 ++++
test/cxl-topology.sh | 166 +++++++++++++++++++++++++++++++++++++++++++
test/meson.build | 2 +
3 files changed, 180 insertions(+)
create mode 100644 test/cxl-topology.sh
diff --git a/test/common b/test/common
index fb48795..65615cc 100644
--- a/test/common
+++ b/test/common
@@ -27,6 +27,18 @@ if [ -z $DAXCTL ]; then
fi
fi
+# CXL
+if [ -z $CXL ]; then
+ if [ -f "../cxl/cxl" ] && [ -x "../cxl/cxl" ]; then
+ export CXL=../cxl/cxl
+ elif [ -f "./cxl/cxl" ] && [ -x "./cxl/cxl" ]; then
+ export CXL=./cxl/cxl
+ else
+ echo "Couldn't find a cxl binary"
+ exit 1
+ fi
+fi
+
if [ -z $TEST_PATH ]; then
export TEST_PATH=.
fi
diff --git a/test/cxl-topology.sh b/test/cxl-topology.sh
new file mode 100644
index 0000000..ff11614
--- /dev/null
+++ b/test/cxl-topology.sh
@@ -0,0 +1,166 @@
+#!/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 $LINENO' ERR
+
+check_prereq "jq"
+
+modprobe -r cxl_test
+modprobe cxl_test
+udevadm settle
+
+# THEORY OF OPERATION: Validate the hard coded assumptions of the
+# cxl_test.ko module that defines its topology in
+# tools/testing/cxl/test/cxl.c. If that model ever changes then the
+# paired update must be made to this test.
+
+# collect cxl_test root device id
+json=$($CXL list -b cxl_test)
+count=$(jq "length" <<< $json)
+((count == 1)) || err "$LINENO"
+root=$(jq -r ".[] | .bus" <<< $json)
+
+
+# validate 2 host bridges under a root port
+port_sort="sort_by(.port | .[4:] | tonumber)"
+json=$($CXL list -b cxl_test -BP)
+count=$(jq ".[] | .[\"ports:$root\"] | length" <<< $json)
+((count == 2)) || err "$LINENO"
+
+bridge[0]=$(jq -r ".[] | .[\"ports:$root\"] | $port_sort | .[0].port" <<< $json)
+bridge[1]=$(jq -r ".[] | .[\"ports:$root\"] | $port_sort | .[1].port" <<< $json)
+
+
+# validate 2 root ports per host bridge
+json=$($CXL list -b cxl_test -T -p ${bridge[0]})
+count=$(jq ".[] | .dports | length" <<< $json)
+((count == 2)) || err "$LINENO"
+
+json=$($CXL list -b cxl_test -T -p ${bridge[1]})
+count=$(jq ".[] | .dports | length" <<< $json)
+((count == 2)) || err "$LINENO"
+
+
+# validate 2 switches per-root port
+json=$($CXL list -b cxl_test -P -p ${bridge[0]})
+count=$(jq ".[] | .[\"ports:${bridge[0]}\"] | length" <<< $json)
+((count == 2)) || err "$LINENO"
+
+switch[0]=$(jq -r ".[] | .[\"ports:${bridge[0]}\"] | $port_sort | .[0].host" <<< $json)
+switch[1]=$(jq -r ".[] | .[\"ports:${bridge[0]}\"] | $port_sort | .[1].host" <<< $json)
+
+json=$($CXL list -b cxl_test -P -p ${bridge[1]})
+count=$(jq ".[] | .[\"ports:${bridge[1]}\"] | length" <<< $json)
+((count == 2)) || err "$LINENO"
+
+switch[2]=$(jq -r ".[] | .[\"ports:${bridge[1]}\"] | $port_sort | .[0].host" <<< $json)
+switch[3]=$(jq -r ".[] | .[\"ports:${bridge[1]}\"] | $port_sort | .[1].host" <<< $json)
+
+
+# check that all 8 cxl_test memdevs are enabled by default and have a
+# pmem size of 256M
+json=$($CXL list -b cxl_test -M)
+count=$(jq "map(select(.pmem_size == $((256 << 20)))) | length" <<< $json)
+((count == 8)) || err "$LINENO"
+
+
+# validate the expected properties of the 4 root decoders
+json=$($CXL list -b cxl_test -D -d root)
+port_id=${root:4}
+port_id_len=${#port_id}
+decoder_sort="sort_by(.decoder | .[$((8+port_id_len)):] | tonumber)"
+count=$(jq "[ $decoder_sort | .[0] |
+ select(.volatile_capable == true) |
+ select(.size == $((256 << 20))) |
+ select(.nr_targets == 1) ] | length" <<< $json)
+((count == 1)) || err "$LINENO"
+
+count=$(jq "[ $decoder_sort | .[1] |
+ select(.volatile_capable == true) |
+ select(.size == $((512 << 20))) |
+ select(.nr_targets == 2) ] | length" <<< $json)
+((count == 1)) || err "$LINENO"
+
+count=$(jq "[ $decoder_sort | .[2] |
+ select(.pmem_capable == true) |
+ select(.size == $((256 << 20))) |
+ select(.nr_targets == 1) ] | length" <<< $json)
+((count == 1)) || err "$LINENO"
+
+count=$(jq "[ $decoder_sort | .[3] |
+ select(.pmem_capable == true) |
+ select(.size == $((512 << 20))) |
+ select(.nr_targets == 2) ] | length" <<< $json)
+((count == 1)) || err "$LINENO"
+
+# check that switch ports disappear after all of their memdevs have been
+# disabled, and return when the memdevs are enabled.
+for s in ${switch[@]}
+do
+ json=$($CXL list -M -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 2)) || err "$LINENO"
+
+ mem[0]=$(jq -r ".[0] | .memdev" <<< $json)
+ mem[1]=$(jq -r ".[1] | .memdev" <<< $json)
+
+ $CXL disable-memdev ${mem[0]} --force
+ json=$($CXL list -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 1)) || err "$LINENO"
+
+ $CXL disable-memdev ${mem[1]} --force
+ json=$($CXL list -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 0)) || err "$LINENO"
+
+ $CXL enable-memdev ${mem[0]}
+ $CXL enable-memdev ${mem[1]}
+
+ json=$($CXL list -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 1)) || err "$LINENO"
+
+ $CXL disable-port $s --force
+ json=$($CXL list -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 0)) || err "$LINENO"
+
+ $CXL enable-memdev ${mem[0]} ${mem[1]}
+ json=$($CXL list -p $s)
+ count=$(jq "length" <<< $json)
+ ((count == 1)) || err "$LINENO"
+done
+
+
+# validate host bridge tear down
+for b in ${bridge[@]}
+do
+ $CXL disable-port $b -f
+ json=$($CXL list -M -i -p $b)
+ count=$(jq "map(select(.state == \"disabled\")) | length" <<< $json)
+ ((count == 4)) || err "$LINENO"
+
+ $CXL enable-port $b -m
+ json=$($CXL list -M -p $b)
+ count=$(jq "length" <<< $json)
+ ((count == 4)) || err "$LINENO"
+done
+
+
+# validate that the bus can be disabled without issue
+$CXL disable-bus $root -f
+
+
+# validate no WARN or lockdep report during the run
+log=$(journalctl -r -k --since "-$((SECONDS+1))s")
+grep -q "Call Trace" <<< $log && err "$LINENO"
+
+modprobe -r cxl_test
diff --git a/test/meson.build b/test/meson.build
index 7ccd451..210dcb0 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -150,6 +150,7 @@ monitor = find_program('monitor.sh')
max_extent = find_program('max_available_extent_ns.sh')
pfn_meta_errors = find_program('pfn-meta-errors.sh')
track_uuid = find_program('track-uuid.sh')
+cxl_topo = find_program('cxl-topology.sh')
tests = [
[ 'libndctl', libndctl, 'ndctl' ],
@@ -174,6 +175,7 @@ tests = [
[ 'max_extent_ns', max_extent, 'ndctl' ],
[ 'pfn-meta-errors.sh', pfn_meta_errors, 'ndctl' ],
[ 'track-uuid.sh', track_uuid, 'ndctl' ],
+ [ 'cxl-topology.sh', cxl_topo, 'cxl' ],
]
if get_option('destructive').enabled()
--
2.27.0