TheRock/debug-tools/rocgdb/source/gdb/testsuite/gdb.rocm/multi-inferior-run-spurious-waves.exp

# Copyright (C) 2021-2024 Advanced Micro Devices, Inc. All rights reserved.

# This file is part of GDB.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Verify that when running an inferior, we don't have a spurious stop in an
# inferior that is supposed to be stopped.  The test scenario is:
#
#   - Start a background process to hog some GPU resources
#   - Start a first inferior.  Not all of its waves are created because of the
#     hogging process.
#   - Stop the hogging process.
#   - Start a second inferior (while the first one is stopped).  A faulty GDB
#     would present a stop in newly created waves of the first inferior.

load_lib rocm.exp

require allow_hip_tests

if { [hip_device_is_less_than gfx90a] } {
    # Scheduling does not work in an intuitive manner before gfx90a due to
    # hardware limitations of forward progress and halted waves, leading to
    # some deadlocks.
    unsupported "device older than gfx90a"
    return
}

standard_testfile .cpp hog.cpp

set binfile_hog ${binfile}-hog

if {[build_executable "failed to prepare" ${binfile} ${srcfile} {debug hip}]} {
    return
}

if {[build_executable "failed to prepare" ${binfile_hog} ${srcfile2} \
     {debug hip additional_flags=-std=c++17}]} {
    return
}

proc do_test { } {
    with_rocm_gpu_lock {
	clean_restart ${::binfile}

	if { ![runto_main] } {
	    return
	}

	set hog_pid [spawn ${::binfile_hog}]
	if { $hog_pid == 0 } {
	    fail "start hog"
	    return
	}

	set hog_spawn_id $spawn_id
	verbose -log "spawned hog as pid $hog_pid, spawn id $spawn_id"

	gdb_breakpoint bit_extract_kernel allow-pending

	set res [gdb_test "continue" "Thread $::decimal .* hit Breakpoint $::decimal.*" \
		    "continue to kernel"]
	# Do a blocking wait to make sure the hog process really goes
	# away before we proceed.
	kill_wait_spawned_process $hog_spawn_id -block
	if { $res != 0 } {
	    return
	}

	set count [info_threads_get_wave_count 1]
	verbose -log "Inferior 1 has $count waves"

	gdb_test "add-inferior" "Added inferior 2 .*"
	gdb_test "inferior 2" "Switching to inferior 2 .*"
	gdb_test "file ${::binfile}" "Reading symbols from .*" "load file"

	# Make sure "run" results in a stop in inferior 2.
	gdb_test_multiple "run" "" {
	    -re -wrap "At least one agent is busy.*" {
		if {[hip_devices_support_debug_multi_process]} {
		    fail $gdb_test_name
		} else {
		    unsupported $gdb_test_name
		}

		return
	    }

	    -re -wrap "Thread 2\\.$::decimal .* hit Breakpoint .*" {
		pass $gdb_test_name
	    }
	}

	set count [info_threads_get_wave_count 2]
	verbose -log "Inferior 2 has $count waves"

	# Try to continue inferior 1 to completion.
	gdb_test "inferior 1"
	delete_breakpoints
	gdb_test "continue" ".*" "continue to end"
    }
}

do_test