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ec07906bdc
The hotplug testing only tries reading a trace remote buffer, loaded before a CPU is offline. Extend this testing to cover: * A trace remote buffer loaded after a CPU is offline. * A trace remote buffer loaded before a CPU is online. Because of these added test cases, move the hotplug testing into a separate hotplug.tc file. Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Link: https://patch.msgid.link/20260401045100.3394299-3-vdonnefort@google.com Signed-off-by: Marc Zyngier <maz@kernel.org>
89 lines
1.5 KiB
Bash
89 lines
1.5 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Test trace remote read with an offline CPU
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# requires: remotes/test
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. $TEST_DIR/remotes/functions
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hotunplug_one_cpu()
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{
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[ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 1
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for cpu in $(get_cpu_ids); do
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echo 0 > /sys/devices/system/cpu/cpu$cpu/online || return 1
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break
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done
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echo $cpu
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}
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# Check non-consuming and consuming read
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check_read()
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{
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for i in $(seq 1 8); do
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echo $i > write_event
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done
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check_trace 1 8 trace
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output=$(dump_trace_pipe)
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check_trace 1 8 $output
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rm $output
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}
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test_hotplug()
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{
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echo 0 > trace
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assert_loaded
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#
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# Test a trace buffer containing an offline CPU
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#
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cpu=$(hotunplug_one_cpu) || exit_unsupported
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trap "echo 1 > /sys/devices/system/cpu/cpu$cpu/online" EXIT
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check_read
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#
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# Test a trace buffer with a missing CPU
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#
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reload_remote
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check_read
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#
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# Test a trace buffer with a CPU added later
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#
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echo 1 > /sys/devices/system/cpu/cpu$cpu/online
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trap "" EXIT
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assert_loaded
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check_read
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# Test if the ring-buffer for the newly added CPU is both writable and
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# readable
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for i in $(seq 1 8); do
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taskset -c $cpu echo $i > write_event
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done
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cd per_cpu/cpu$cpu/
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check_trace 1 8 trace
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output=$(dump_trace_pipe)
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check_trace 1 8 $output
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rm $output
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cd -
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}
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if [ -z "$SOURCE_REMOTE_TEST" ]; then
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set -e
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setup_remote_test
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test_hotplug
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fi
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