From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6ED0BC197A0 for ; Fri, 17 Nov 2023 08:35:11 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=poNwvfqK; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4SWqwG0Yhhz3dL1 for ; Fri, 17 Nov 2023 19:35:10 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=poNwvfqK; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=vishalc@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4SWqvC2R6cz3cTb for ; Fri, 17 Nov 2023 19:34:15 +1100 (AEDT) Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AH8L76e001051; Fri, 17 Nov 2023 08:34:06 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=message-id : date : mime-version : subject : to : references : from : in-reply-to : content-type : content-transfer-encoding; s=pp1; bh=5eg4jOGvfviQ8d+AqXlZ71Ct25iNOYjmsrROE+AGWGA=; b=poNwvfqKo3SPjOjxCEV6bTw+MAucEy3kyGop641Nk07QtdtFMxZkR2rZDWNggAlLy0u7 RtZEhP3Swmm9cdb0nc86irC+sGySxcQ80BcWnjbsDGTryjwQhpj196FTxZdbjgVlsayp t76VLUzkktCXmz3GNsB2rxqAiO9CVYPQwJ7R3E5TL8dumr014AMHfa8shGAaPRw/w6zX beySIN6WnAbc/VxBf/I0NYjYX42cFRZt9YsDIIDD2Syh2MzySKjLqE5+kTOZcbLqmCxK qJBc1RRbRFJw65Ct1GsZ19x7X5uG8qTKByB2bwBtnff3poYAyt128+6isF9oDBcwbm/K zw== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3ue43fs8eh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 17 Nov 2023 08:34:05 +0000 Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3AH6HELh026321; Fri, 17 Nov 2023 08:34:04 GMT Received: from smtprelay04.dal12v.mail.ibm.com ([172.16.1.6]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3uapn242xv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 17 Nov 2023 08:34:04 +0000 Received: from smtpav04.wdc07v.mail.ibm.com (smtpav04.wdc07v.mail.ibm.com [10.39.53.231]) by smtprelay04.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3AH8Y3Hx61210934 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Nov 2023 08:34:04 GMT Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CE9315805E; Fri, 17 Nov 2023 08:34:03 +0000 (GMT) Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6DF0358061; Fri, 17 Nov 2023 08:34:02 +0000 (GMT) Received: from [9.204.201.194] (unknown [9.204.201.194]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 17 Nov 2023 08:34:02 +0000 (GMT) Message-ID: <2847bd6b-77c3-4705-86c9-96a5bf5138be@linux.ibm.com> Date: Fri, 17 Nov 2023 14:04:00 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] powerpc: Restrict ARCH_HIBERNATION_POSSIBLE to supported configurations Content-Language: en-US To: Michael Ellerman , Aneesh Kumar K V , linuxppc-dev@lists.ozlabs.org References: <20231114082046.6018-1-vishalc@linux.ibm.com> <87sf57zbcd.fsf@linux.ibm.com> <87jzqh706q.fsf@mail.lhotse> From: Vishal Chourasia In-Reply-To: <87jzqh706q.fsf@mail.lhotse> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: vJTCCEV30QzSvBJuDMsOAIvVygIOuvWF X-Proofpoint-GUID: vJTCCEV30QzSvBJuDMsOAIvVygIOuvWF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-17_06,2023-11-16_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 spamscore=0 mlxscore=0 suspectscore=0 malwarescore=0 mlxlogscore=999 clxscore=1011 impostorscore=0 phishscore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311170062 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 17/11/23 4:52 am, Michael Ellerman wrote: > Vishal Chourasia writes: >> On 15/11/23 5:46 pm, Aneesh Kumar K V wrote: >>> On 11/15/23 5:23 PM, Vishal Chourasia wrote: >>>> On 15/11/23 1:39 pm, Aneesh Kumar K.V wrote: >>>>> Vishal Chourasia writes: >>>>> >>>>>> This patch modifies the ARCH_HIBERNATION_POSSIBLE option to ensure that it >>>>>> correctly depends on these PowerPC configurations being enabled. As a result, >>>>>> it prevents the HOTPLUG_CPU from being selected when the required dependencies >>>>>> are not satisfied. >>>>>> >>>>>> This change aligns the dependency tree with the expected hardware support for >>>>>> CPU hot-plugging under PowerPC architectures, ensuring that the kernel >>>>>> configuration steps do not lead to inconsistent states. >>>>>> >>>>>> Signed-off-by: Vishal Chourasia >>>>>> --- >>>>>> During the configuration process with 'make randconfig' followed by >>>>>> 'make olddefconfig', we observed a warning indicating an unmet direct >>>>>> dependency for the HOTPLUG_CPU option. The dependency in question relates to >>>>>> various PowerPC configurations (PPC_PSERIES, PPC_PMAC, PPC_POWERNV, >>>>>> FSL_SOC_BOOKE) which were not enabled, yet the HOTPLUG_CPU was being >>>>>> erroneously selected due to an implicit assumption by the PM_SLEEP_SMP option. >>>>>> This misalignment in dependencies could potentially lead to inconsistent kernel >>>>>> configuration states, especially when considering the necessary hardware >>>>>> support for CPU hot-plugging on PowerPC platforms. The patch aims to correct >>>>>> this by ensuring that ARCH_HIBERNATION_POSSIBLE is contingent upon the >>>>>> appropriate PowerPC configurations being active. >>>>>> >>>>>> steps to reproduce (before applying the patch): >>>>>> >>>>>> Run 'make pseries_le_defconfig' >>>>>> Run 'make menuconfig' >>>>>> Enable hibernation [ Kernel options -> Hibernation (aka 'suspend to disk') ] >>>>>> Disable [ Platform support -> IBM PowerNV (Non-Virtualized) platform support ] >>>>>> Disable [ Platform support -> IBM pSeries & new (POWER5-based) iSeries ] >>>>>> Enable SMP [ Processor support -> Symmetric multi-processing support ] >>>>>> Save the config >>>>>> Run 'make olddefconfig' >>>>>> >>>>>> arch/powerpc/Kconfig | 5 +++-- >>>>>> 1 file changed, 3 insertions(+), 2 deletions(-) >>>>>> >>>>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >>>>>> index 6f105ee4f3cf..bf99ff9869f6 100644 >>>>>> --- a/arch/powerpc/Kconfig >>>>>> +++ b/arch/powerpc/Kconfig >>>>>> @@ -380,8 +380,9 @@ config DEFAULT_UIMAGE >>>>>> Used to allow a board to specify it wants a uImage built by default >>>>>> >>>>>> config ARCH_HIBERNATION_POSSIBLE >>>>>> - bool >>>>>> - default y >>>>>> + def_bool y >>>>>> + depends on PPC_PSERIES || \ >>>>>> + PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE >>>>>> >>>>>> config ARCH_SUSPEND_POSSIBLE >>>>>> def_bool y >>>>>> >>>>> I am wondering whether it should be switched to using select from >>>>> config PPC? >>>>> >>>>> selecting ARCH_HIBERNATION_POSSIBLE based on value of config PPC >>>>> will not guarantee config PPC_PSERIES being set >>>>> >>>>> PPC_PSERIES can be set to N, even when config PPC is set. >> I understand what you meant before. Having ARCH_HIBERNATION_POSSIBLE under config PPC makes more sense. >>>>> grep -A 5 -i "config ppc_pseries" arch/powerpc/platforms/pseries/Kconfig >>>>> config PPC_PSERIES >>>>>         depends on PPC64 && PPC_BOOK3S >>>>>         bool "IBM pSeries & new (POWER5-based) iSeries" >>>>>         select HAVE_PCSPKR_PLATFORM >>>>>         select MPIC >>>>>         select OF_DYNAMIC >>>>> >>> modified arch/powerpc/Kconfig >>> @@ -156,6 +156,7 @@ config PPC >>> select ARCH_HAS_UACCESS_FLUSHCACHE >>> select ARCH_HAS_UBSAN_SANITIZE_ALL >>> select ARCH_HAVE_NMI_SAFE_CMPXCHG >>> + select ARCH_HIBERNATION_POSSIBLE if (PPC_PSERIES || PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) >>> select ARCH_KEEP_MEMBLOCK >>> select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU >>> select ARCH_MIGHT_HAVE_PC_PARPORT >> Though, even with these changes I was able to reproduce same warnings. (using steps from above) >> It's because one can enable HIBERNATION manually. > But how? You shouldn't be able to enable it manually, it depends on > ARCH_HIBERNATION_POSSIBLE which shouldn't be enabled. > > For the above to work you also need to make it default n, eg: > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 6f105ee4f3cf..dd2a9b938188 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -380,8 +380,7 @@ config DEFAULT_UIMAGE > Used to allow a board to specify it wants a uImage built by default > > config ARCH_HIBERNATION_POSSIBLE > - bool > - default y > + def_bool n > > config ARCH_SUSPEND_POSSIBLE > def_bool y Verified. Will send out another version. > > cheers