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 X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0AB1C433E2 for ; Wed, 3 Jun 2020 15:33:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A17E8206A2 for ; Wed, 3 Jun 2020 15:33:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="A/SwLVZ5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726112AbgFCPdn (ORCPT ); Wed, 3 Jun 2020 11:33:43 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:51394 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725954AbgFCPdl (ORCPT ); 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Wed, 03 Jun 2020 15:32:45 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 053FI3gP098896; Wed, 3 Jun 2020 15:30:45 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 31dju3dpfd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 03 Jun 2020 15:30:43 +0000 Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 053FUY4n020909; Wed, 3 Jun 2020 15:30:34 GMT Received: from dhcp-10-154-181-144.vpn.oracle.com (/10.154.181.144) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 03 Jun 2020 08:30:34 -0700 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump From: John Donnelly In-Reply-To: <8463464e-5461-f328-621c-bacc6a3b88dd@huawei.com> Date: Wed, 3 Jun 2020 10:30:27 -0500 Cc: Prabhakar Kushwaha , Devicetree List , Arnd Bergmann , Baoquan He , Linux Doc Mailing List , Catalin Marinas , Bhupesh Sharma , RuiRui Yang , kexec mailing list , Linux Kernel Mailing List , Rob Herring , Simon Horman , James Morse , guohanjun@huawei.com, Thomas Gleixner , Prabhakar Kushwaha , Will Deacon , Ingo Molnar , linux-arm-kernel , nsaenzjulienne@suse.de Content-Transfer-Encoding: quoted-printable Message-Id: <8E0D45DC-12BF-437D-A342-03E974D9C6D4@oracle.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> <303695cc-d3ea-9f51-1489-07d27d4253d4@oracle.com> <6EA47B07-5119-49DF-9980-12A2066F22CA@oracle.com> <8463464e-5461-f328-621c-bacc6a3b88dd@huawei.com> To: chenzhou X-Mailer: Apple Mail (2.3445.9.1) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9641 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 mlxscore=0 adultscore=0 bulkscore=0 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006030122 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9641 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 bulkscore=0 phishscore=0 suspectscore=1 impostorscore=0 cotscore=-2147483648 lowpriorityscore=0 mlxscore=0 adultscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006030122 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Jun 3, 2020, at 8:20 AM, chenzhou wrote: >=20 > Hi, >=20 >=20 > On 2020/6/3 19:47, Prabhakar Kushwaha wrote: >> Hi Chen, >>=20 >> On Tue, Jun 2, 2020 at 8:12 PM John Donnelly = wrote: >>>=20 >>>=20 >>>> On Jun 2, 2020, at 12:38 AM, Prabhakar Kushwaha = wrote: >>>>=20 >>>> On Tue, Jun 2, 2020 at 3:29 AM John Donnelly = wrote: >>>>> Hi . See below ! >>>>>=20 >>>>>> On Jun 1, 2020, at 4:02 PM, Bhupesh Sharma = wrote: >>>>>>=20 >>>>>> Hi John, >>>>>>=20 >>>>>> On Tue, Jun 2, 2020 at 1:01 AM John Donnelly = wrote: >>>>>>> Hi, >>>>>>>=20 >>>>>>>=20 >>>>>>> On 6/1/20 7:02 AM, Prabhakar Kushwaha wrote: >>>>>>>> Hi Chen, >>>>>>>>=20 >>>>>>>> On Thu, May 21, 2020 at 3:05 PM Chen Zhou = wrote: >>>>>>>>> This patch series enable reserving crashkernel above 4G in = arm64. >>>>>>>>>=20 >>>>>>>>> There are following issues in arm64 kdump: >>>>>>>>> 1. We use crashkernel=3DX to reserve crashkernel below 4G, = which will fail >>>>>>>>> when there is no enough low memory. >>>>>>>>> 2. Currently, crashkernel=3DY@X can be used to reserve = crashkernel above 4G, >>>>>>>>> in this case, if swiotlb or DMA buffers are required, crash = dump kernel >>>>>>>>> will boot failure because there is no low memory available for = allocation. >>>>>>>>>=20 >>>>>>>> We are getting "warn_alloc" [1] warning during boot of kdump = kernel >>>>>>>> with bootargs as [2] of primary kernel. >>>>>>>> This error observed on ThunderX2 ARM64 platform. >>>>>>>>=20 >>>>>>>> It is observed with latest upstream tag (v5.7-rc3) with this = patch set >>>>>>>> and = https://urldefense.com/v3/__https://lists.infradead.org/pipermail/kexec/20= 20-May/025128.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3= KRVqALmvSK2VmCkIPIhsaxbiIAAlzu$ >>>>>>>> Also **without** this patch-set >>>>>>>> = "https://urldefense.com/v3/__https://www.spinics.net/lists/arm-kernel/msg8= 06882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmv= SK2VmCkIPIhsaxbjC6ujMA$" >>>>>>>>=20 >>>>>>>> This issue comes whenever crashkernel memory is reserved after = 0xc000_0000. >>>>>>>> More details discussed earlier in >>>>>>>> = https://urldefense.com/v3/__https://www.spinics.net/lists/arm-kernel/msg80= 6882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvS= K2VmCkIPIhsaxbjC6ujMA$ without any >>>>>>>> solution >>>>>>>>=20 >>>>>>>> This patch-set is expected to solve similar kind of issue. >>>>>>>> i.e. low memory is only targeted for DMA, swiotlb; So above = mentioned >>>>>>>> observation should be considered/fixed. . >>>>>>>>=20 >>>>>>>> --pk >>>>>>>>=20 >>>>>>>> [1] >>>>>>>> [ 30.366695] DMI: Cavium Inc. Saber/Saber, BIOS >>>>>>>> TX2-FW-Release-3.1-build_01-2803-g74253a541a mm/dd/yyyy >>>>>>>> [ 30.367696] NET: Registered protocol family 16 >>>>>>>> [ 30.369973] swapper/0: page allocation failure: order:6, >>>>>>>> mode:0x1(GFP_DMA), nodemask=3D(null),cpuset=3D/,mems_allowed=3D0 >>>>>>>> [ 30.369980] CPU: 0 PID: 1 Comm: swapper/0 Not tainted = 5.7.0-rc3+ #121 >>>>>>>> [ 30.369981] Hardware name: Cavium Inc. Saber/Saber, BIOS >>>>>>>> TX2-FW-Release-3.1-build_01-2803-g74253a541a mm/dd/yyyy >>>>>>>> [ 30.369984] Call trace: >>>>>>>> [ 30.369989] dump_backtrace+0x0/0x1f8 >>>>>>>> [ 30.369991] show_stack+0x20/0x30 >>>>>>>> [ 30.369997] dump_stack+0xc0/0x10c >>>>>>>> [ 30.370001] warn_alloc+0x10c/0x178 >>>>>>>> [ 30.370004] = __alloc_pages_slowpath.constprop.111+0xb10/0xb50 >>>>>>>> [ 30.370006] __alloc_pages_nodemask+0x2b4/0x300 >>>>>>>> [ 30.370008] alloc_page_interleave+0x24/0x98 >>>>>>>> [ 30.370011] alloc_pages_current+0xe4/0x108 >>>>>>>> [ 30.370017] dma_atomic_pool_init+0x44/0x1a4 >>>>>>>> [ 30.370020] do_one_initcall+0x54/0x228 >>>>>>>> [ 30.370027] kernel_init_freeable+0x228/0x2cc >>>>>>>> [ 30.370031] kernel_init+0x1c/0x110 >>>>>>>> [ 30.370034] ret_from_fork+0x10/0x18 >>>>>>>> [ 30.370036] Mem-Info: >>>>>>>> [ 30.370064] active_anon:0 inactive_anon:0 isolated_anon:0 >>>>>>>> [ 30.370064] active_file:0 inactive_file:0 isolated_file:0 >>>>>>>> [ 30.370064] unevictable:0 dirty:0 writeback:0 unstable:0 >>>>>>>> [ 30.370064] slab_reclaimable:34 slab_unreclaimable:4438 >>>>>>>> [ 30.370064] mapped:0 shmem:0 pagetables:14 bounce:0 >>>>>>>> [ 30.370064] free:1537719 free_pcp:219 free_cma:0 >>>>>>>> [ 30.370070] Node 0 active_anon:0kB inactive_anon:0kB >>>>>>>> active_file:0kB inactive_file:0kB unevictable:0kB = isolated(anon):0kB >>>>>>>> isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB >>>>>>>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB = writeback_tmp:0kB >>>>>>>> unstable:0kB all_unreclaimable? no >>>>>>>> [ 30.370073] Node 1 active_anon:0kB inactive_anon:0kB >>>>>>>> active_file:0kB inactive_file:0kB unevictable:0kB = isolated(anon):0kB >>>>>>>> isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB >>>>>>>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB = writeback_tmp:0kB >>>>>>>> unstable:0kB all_unreclaimable? no >>>>>>>> [ 30.370079] Node 0 DMA free:0kB min:0kB low:0kB high:0kB >>>>>>>> reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB >>>>>>>> active_file:0kB inactive_file:0kB unevictable:0kB = writepending:0kB >>>>>>>> present:128kB managed:0kB mlocked:0kB kernel_stack:0kB = pagetables:0kB >>>>>>>> bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB >>>>>>>> [ 30.370084] lowmem_reserve[]: 0 250 6063 6063 >>>>>>>> [ 30.370090] Node 0 DMA32 free:256000kB min:408kB low:664kB >>>>>>>> high:920kB reserved_highatomic:0KB active_anon:0kB = inactive_anon:0kB >>>>>>>> active_file:0kB inactive_file:0kB unevictable:0kB = writepending:0kB >>>>>>>> present:269700kB managed:256000kB mlocked:0kB kernel_stack:0kB >>>>>>>> pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB = free_cma:0kB >>>>>>>> [ 30.370094] lowmem_reserve[]: 0 0 5813 5813 >>>>>>>> [ 30.370100] Node 0 Normal free:5894876kB min:9552kB = low:15504kB >>>>>>>> high:21456kB reserved_highatomic:0KB active_anon:0kB = inactive_anon:0kB >>>>>>>> active_file:0kB inactive_file:0kB unevictable:0kB = writepending:0kB >>>>>>>> present:8388608kB managed:5953112kB mlocked:0kB = kernel_stack:21672kB >>>>>>>> pagetables:56kB bounce:0kB free_pcp:876kB local_pcp:176kB = free_cma:0kB >>>>>>>> [ 30.370104] lowmem_reserve[]: 0 0 0 0 >>>>>>>> [ 30.370107] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB = 0*128kB >>>>>>>> 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 0kB >>>>>>>> [ 30.370113] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB = 0*128kB >>>>>>>> 0*256kB 0*512kB 0*1024kB 1*2048kB (M) 62*4096kB (M) =3D = 256000kB >>>>>>>> [ 30.370119] Node 0 Normal: 2*4kB (M) 3*8kB (ME) 2*16kB (UE) = 3*32kB >>>>>>>> (UM) 1*64kB (U) 2*128kB (M) 2*256kB (ME) 3*512kB (ME) 3*1024kB = (ME) >>>>>>>> 3*2048kB (UME) 1436*4096kB (M) =3D 5893600kB >>>>>>>> [ 30.370129] Node 0 hugepages_total=3D0 hugepages_free=3D0 >>>>>>>> hugepages_surp=3D0 hugepages_size=3D1048576kB >>>>>>>> [ 30.370130] 0 total pagecache pages >>>>>>>> [ 30.370132] 0 pages in swap cache >>>>>>>> [ 30.370134] Swap cache stats: add 0, delete 0, find 0/0 >>>>>>>> [ 30.370135] Free swap =3D 0kB >>>>>>>> [ 30.370136] Total swap =3D 0kB >>>>>>>> [ 30.370137] 2164609 pages RAM >>>>>>>> [ 30.370139] 0 pages HighMem/MovableOnly >>>>>>>> [ 30.370140] 612331 pages reserved >>>>>>>> [ 30.370141] 0 pages hwpoisoned >>>>>>>> [ 30.370143] DMA: failed to allocate 256 KiB pool for atomic >>>>>>>> coherent allocation >>>>>>>=20 >>>>>>> During my testing I saw the same error and Chen's solution = corrected it . >>>>>> Which combination you are using on your side? I am using = Prabhakar's >>>>>> suggested environment and can reproduce the issue >>>>>> with or without Chen's crashkernel support above 4G patchset. >>>>>>=20 >>>>>> I am also using a ThunderX2 platform with latest makedumpfile = code and >>>>>> kexec-tools (with the suggested patch >>>>>> = ). >>>>>>=20 >>>>>> Thanks, >>>>>> Bhupesh >>>>>=20 >>>>> I did this activity 5 months ago and I have moved on to other = activities. My DMA failures were related to PCI devices that could not = be enumerated because low-DMA space was not available when crashkernel = was moved above 4G; I don=E2=80=99t recall the exact platform. >>>>>=20 >>>>>=20 >>>>>=20 >>>>> For this failure , >>>>>=20 >>>>>>>> DMA: failed to allocate 256 KiB pool for atomic >>>>>>>> coherent allocation >>>>>=20 >>>>> Is due to : >>>>>=20 >>>>>=20 >>>>> 3618082c >>>>> ("arm64 use both ZONE_DMA and ZONE_DMA32") >>>>>=20 >>>>> With the introduction of ZONE_DMA to support the Raspberry DMA >>>>> region below 1G, the crashkernel is placed in the upper 4G >>>>> ZONE_DMA_32 region. Since the crashkernel does not have access >>>>> to the ZONE_DMA region, it prints out call trace during bootup. >>>>>=20 >>>>> It is due to having this CONFIG item ON : >>>>>=20 >>>>>=20 >>>>> CONFIG_ZONE_DMA=3Dy >>>>>=20 >>>>> Turning off ZONE_DMA fixes a issue and Raspberry PI 4 will >>>>> use the device tree to specify memory below 1G. >>>>>=20 >>>>>=20 >>>> Disabling ZONE_DMA is temporary solution. We may need proper = solution >>>=20 >>> Perhaps the Raspberry platform configuration dependencies need = separated from =E2=80=9Cserver class=E2=80=9D Arm equipment ? Or = auto-configured on boot ? Consult an expert ;-) >>>=20 >>>=20 >>>=20 >>>>> I would like to see Chen=E2=80=99s feature added , perhaps as = EXPERIMENTAL, so we can get some configuration testing done on it. It = corrects having a DMA zone in low memory while crash-kernel is above = 4GB. This has been going on for a year now. >>>> I will also like this patch to be added in Linux as early as = possible. >>>>=20 >>>> Issue mentioned by me happens with or without this patch. >>>>=20 >>>> This patch-set can consider fixing because it uses low memory for = DMA >>>> & swiotlb only. >>>> We can consider restricting crashkernel within the required range = like below >>>>=20 >>>> diff --git a/kernel/crash_core.c b/kernel/crash_core.c >>>> index 7f9e5a6dc48c..bd67b90d35bd 100644 >>>> --- a/kernel/crash_core.c >>>> +++ b/kernel/crash_core.c >>>> @@ -354,7 +354,7 @@ int __init reserve_crashkernel_low(void) >>>> return 0; >>>> } >>>>=20 >>>> - low_base =3D memblock_find_in_range(0, 1ULL << 32, = low_size, CRASH_ALIGN); >>>> + low_base =3D memblock_find_in_range(0,0xc0000000, low_size, = CRASH_ALIGN); >>>> if (!low_base) { >>>> pr_err("Cannot reserve %ldMB crashkernel low memory, >>>> please try smaller size.\n", >>>> (unsigned long)(low_size >> 20)); >>>>=20 >>>>=20 >>> I suspect 0xc0000000 would need to be a CONFIG item and not = hard-coded. >>>=20 >> if you consider this as valid change, can you please incorporate as >> part of your patch-set. >=20 > After commit 1a8e1cef7 ("arm64: use both ZONE_DMA and = ZONE_DMA32")=EF=BC=8Cthe 0-4G memory is splited > to DMA [mem 0x0000000000000000-0x000000003fffffff] and DMA32 [mem = 0x0000000040000000-0x00000000ffffffff] on arm64. >=20 > =46rom the above discussion, on your platform, the low crashkernel = fall in DMA32 region, but your environment needs to access DMA > region, so there is the call trace. >=20 > I have a question, why do you choose 0xc0000000 here? >=20 > Besides, this is common code, we also need to consider about x86. >=20 + nsaenzjulienne@suse.de=20 Exactly . This is why it needs to be a CONFIG option for Raspberry = .., or device tree option.=20 We could revert 1a8e1cef7 since it broke Arm kdump too. >=20 > Thanks, > Chen Zhou >=20 =20 =20= 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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD09BC433DF for ; Wed, 3 Jun 2020 15:33:31 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with 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crashkernel above 4G on arm64 kdump From: John Donnelly In-Reply-To: <8463464e-5461-f328-621c-bacc6a3b88dd@huawei.com> Date: Wed, 3 Jun 2020 10:30:27 -0500 Message-Id: <8E0D45DC-12BF-437D-A342-03E974D9C6D4@oracle.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> <303695cc-d3ea-9f51-1489-07d27d4253d4@oracle.com> <6EA47B07-5119-49DF-9980-12A2066F22CA@oracle.com> <8463464e-5461-f328-621c-bacc6a3b88dd@huawei.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: chenzhou Cc: Simon Horman , Devicetree List , Arnd Bergmann , Baoquan He , Linux Doc Mailing List , Catalin Marinas , Bhupesh Sharma , guohanjun@huawei.com, kexec mailing list , Linux Kernel Mailing List , Will Deacon , Rob Herring , James Morse , nsaenzjulienne@suse.de, Prabhakar Kushwaha , Thomas Gleixner , Prabhakar Kushwaha 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