From patchwork Mon Sep 23 22:50:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yifei Liu X-Patchwork-Id: 13809984 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72F41383A3 for ; Mon, 23 Sep 2024 22:50:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.177.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727131850; cv=none; b=c0SPihIvN1bJkk5qRPCjH3CnehjFx4T1Y0NtMgV+1aCCk9yY9JKMJK0wwlXGabY9G/vXiyn03uQXpMkwac5Y8mwTscdr5YdziAMhxTZU4m/0PdVxei0FqeOjCfZCfWXzN9lYFNnUI8mJp3MmBsgTvmWeeSSK7vwdmrMbrP8+UlM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727131850; c=relaxed/simple; bh=unmj37GAB6bMgTBJJX4hzeGKIz8CAvupf7JXqH+D+j4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=U7lIpqS/36Xlbzi51io3jBW9axk8P/WK1MDAT8z/nILRhreLwHLgoEJ34MFX0UtE88ag5COtiteJtIy9GKnPid62I29EH1WiVqjzLWJYxDh6JfW1Zy920edinfc0890QKzfomTyxJ1hEZKr5v2tHU7iZ7S9/V55z/YZMmLyzIBI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=NR8vziI/; arc=none smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="NR8vziI/" Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 48NLs5R6004715; Mon, 23 Sep 2024 22:50:44 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; s=corp-2023-11-20; bh=XT1Edo8bFZM9IV B3HQ23U06nIk6G9gv5kG0/NuJmjDI=; b=NR8vziI/uzTNEFuLomxSB+H7WOHOwE zIoiBCBKDfthMir6DQhFIcTG+QwiVdORnqZ8x9ycGaAvMqAenZh8GFOjVwuuZjaI 601YbvtYF3pi79VugP33SKV4Kl/aeCKm+Io6pTooG1PstXrPt3y5KeJs7tvLv9JC A93Hxto6fw0iFjTRn6vlm+tVE01fgfUJAMVFg/dCJyDlTEnXx8TRjg9MUsVzFOXu lwxlWRvA71G8duZoBVcutdG67jb44l/fHliTX9fUaD2kpXqoKaOxd/U+4BG1jtbN MU+pvM7sQ2SXf0gPuRmZZ860pNpe1YFwKi9+lpq6hrlEapKR/nt4yi8w== Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.appoci.oracle.com [138.1.37.129]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 41snrt3gpt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 Sep 2024 22:50:44 +0000 (GMT) Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 48NLgA2o038066; Mon, 23 Sep 2024 22:50:43 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 41tkc51cks-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 Sep 2024 22:50:43 +0000 Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 48NMmuis024549; Mon, 23 Sep 2024 22:50:43 GMT Received: from ca-dev110.us.oracle.com (ca-dev110.us.oracle.com [10.129.136.45]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 41tkc51ck6-1; Mon, 23 Sep 2024 22:50:42 +0000 From: Yifei Liu To: shuah@kernel.org Cc: yifei.l.liu@oracle.com, linux-kselftest@vger.kernel.org, ramanan.govindarajan@oracle.com, sinadin.shan@oracle.com Subject: [PATCH v3 v6.11 v5.15 v5.4 v4.19 1/1] selftests: breakpoints: use remaining time to check if suspend succeed Date: Mon, 23 Sep 2024 15:50:34 -0700 Message-ID: <20240923225034.1869251-1-yifei.l.liu@oracle.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-23_15,2024-09-23_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 adultscore=0 mlxscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2408220000 definitions=main-2409230163 X-Proofpoint-GUID: 3u1PpDF_fN7x6ldB7kYOQrP9U-FYMNtH X-Proofpoint-ORIG-GUID: 3u1PpDF_fN7x6ldB7kYOQrP9U-FYMNtH "step_after_suspend_test fails with device busy error while writing to /sys/power/state to start suspend." The test believes it failed to enter suspend state with $ sudo ./step_after_suspend_test TAP version 13 Bail out! Failed to enter Suspend state However, in the kernel message, I indeed see the system get suspended and then wake up later. [611172.033108] PM: suspend entry (s2idle) [611172.044940] Filesystems sync: 0.006 seconds [611172.052254] Freezing user space processes [611172.059319] Freezing user space processes completed (elapsed 0.001 seconds) [611172.067920] OOM killer disabled. [611172.072465] Freezing remaining freezable tasks [611172.080332] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) [611172.089724] printk: Suspending console(s) (use no_console_suspend to debug) [611172.117126] serial 00:03: disabled --- some other hardware get reconnected --- [611203.136277] OOM killer enabled. [611203.140637] Restarting tasks ... [611203.141135] usb 1-8.1: USB disconnect, device number 7 [611203.141755] done. [611203.155268] random: crng reseeded on system resumption [611203.162059] PM: suspend exit After investigation, I noticed that for the code block if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem")) ksft_exit_fail_msg("Failed to enter Suspend state\n"); The write will return -1 and errno is set to 16 (device busy). It should be caused by the write function is not successfully returned before the system suspend and the return value get messed when waking up. As a result, It may be better to check the time passed of those few instructions to determine whether the suspend is executed correctly for it is pretty hard to execute those few lines for 5 seconds. The timer to wake up the system is set to expire after 5 seconds and no re-arm. If the timer remaining time is 0 second and 0 nano secomd, it means the timer expired and wake the system up. Otherwise, the system could be considered to enter the suspend state failed if there is any remaining time. After appling this patch, the test would not fail for it believes the system does not go to suspend by mistake. It now could continue to the rest part of the test after suspend. Fixes: bfd092b8c2728 ("selftests: breakpoint: add step_after_suspend_test") Reported-by: Sinadin Shan Signed-off-by: Yifei Liu --- .../testing/selftests/breakpoints/step_after_suspend_test.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/breakpoints/step_after_suspend_test.c b/tools/testing/selftests/breakpoints/step_after_suspend_test.c index dfec31fb9b30d..33f5542bf741d 100644 --- a/tools/testing/selftests/breakpoints/step_after_suspend_test.c +++ b/tools/testing/selftests/breakpoints/step_after_suspend_test.c @@ -152,7 +152,10 @@ void suspend(void) if (err < 0) ksft_exit_fail_msg("timerfd_settime() failed\n"); - if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem")) + system("(echo mem > /sys/power/state) 2> /dev/null"); + + timerfd_gettime(timerfd,&spec); + if (spec.it_value.tv_sec != 0 || spec.it_value.tv_nsec != 0) ksft_exit_fail_msg("Failed to enter Suspend state\n"); close(timerfd);