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Sat, 20 Jun 2020 00:01:27 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 05JNxJBX045647; Sat, 20 Jun 2020 00:01:27 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 31q66s5naf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 20 Jun 2020 00:01:27 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 05K01F77002911; Sat, 20 Jun 2020 00:01:15 GMT Received: from [192.168.1.126] (/47.220.71.223) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 19 Jun 2020 17:01:15 -0700 Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump To: chenzhou , Nicolas Saenz Julienne , Bhupesh Sharma Cc: Simon Horman , Devicetree List , Arnd Bergmann , Baoquan He , Linux Doc Mailing List , Catalin Marinas , guohanjun@huawei.com, kexec mailing list , Linux Kernel Mailing List , Will Deacon , Rob Herring , James Morse , Prabhakar Kushwaha , Thomas Gleixner , Prabhakar Kushwaha , RuiRui Yang , Ingo Molnar , linux-arm-kernel 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> <8E0D45DC-12BF-437D-A342-03E974D9C6D4@oracle.com> <751bbe2512628ff38002db33ce02af051d080cd2.camel@suse.de> <8ca6c3e9-b8ab-77c3-a1d3-beb513c22f1b@oracle.com> <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> From: John Donnelly Message-ID: <437140b8-e0f8-97a4-307d-fe7c304b37be@oracle.com> Date: Fri, 19 Jun 2020 19:01:14 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9657 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 phishscore=0 mlxscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190169 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9657 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 cotscore=-2147483648 malwarescore=0 clxscore=1015 adultscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 mlxlogscore=999 priorityscore=1501 bulkscore=0 phishscore=0 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190169 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/19/20 3:21 AM, chenzhou wrote: > On 2020/6/19 10:32, John Donnelly wrote: >> On 6/4/20 12:01 PM, Nicolas Saenz Julienne wrote: >>> On Thu, 2020-06-04 at 01:17 +0530, Bhupesh Sharma wrote: >>>> Hi All, >>>> >>>> On Wed, Jun 3, 2020 at 9:03 PM John Donnelly >>>> wrote: >>>>>> On Jun 3, 2020, at 8:20 AM, chenzhou wrote: >>>>>> >>>>>> Hi, >>>>>> >>>>>> >>>>>> On 2020/6/3 19:47, Prabhakar Kushwaha wrote: >>>>>>> Hi Chen, >>>>>>> >>>>>>> On Tue, Jun 2, 2020 at 8:12 PM John Donnelly >>>>>>> wrote: >>>>>>>> >>>>>>>>> On Jun 2, 2020, at 12:38 AM, Prabhakar Kushwaha < >>>>>>>>> prabhakar.pkin@gmail.com> wrote: >>>>>>>>> >>>>>>>>> On Tue, Jun 2, 2020 at 3:29 AM John Donnelly < >>>>>>>>> john.p.donnelly@oracle.com> wrote: >>>>>>>>>> Hi . See below ! >>>>>>>>>> >>>>>>>>>>> On Jun 1, 2020, at 4:02 PM, Bhupesh Sharma >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> Hi John, >>>>>>>>>>> >>>>>>>>>>> On Tue, Jun 2, 2020 at 1:01 AM John Donnelly < >>>>>>>>>>> John.P.donnelly@oracle.com> wrote: >>>>>>>>>>>> Hi, >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On 6/1/20 7:02 AM, Prabhakar Kushwaha wrote: >>>>>>>>>>>>> Hi Chen, >>>>>>>>>>>>> >>>>>>>>>>>>> On Thu, May 21, 2020 at 3:05 PM Chen Zhou < >>>>>>>>>>>>> chenzhou10@huawei.com> wrote: >>>>>>>>>>>>>> This patch series enable reserving crashkernel above 4G in >>>>>>>>>>>>>> arm64. >>>>>>>>>>>>>> >>>>>>>>>>>>>> There are following issues in arm64 kdump: >>>>>>>>>>>>>> 1. We use crashkernel=X to reserve crashkernel below 4G, >>>>>>>>>>>>>> which will fail >>>>>>>>>>>>>> when there is no enough low memory. >>>>>>>>>>>>>> 2. Currently, crashkernel=Y@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. >>>>>>>>>>>>>> >>>>>>>>>>>>> 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. >>>>>>>>>>>>> >>>>>>>>>>>>> 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/2020-May/025128.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbiIAAlzu$ >>>>>>>>>>>>> Also **without** this patch-set >>>>>>>>>>>>> " >>>>>>>>>>>>> >>> https://urldefense.com/v3/__https://www.spinics.net/lists/arm-kernel/msg806882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbjC6ujMA$ >>>>>>>>>>>>> " >>>>>>>>>>>>> >>>>>>>>>>>>> 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/msg806882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbjC6ujMA$ >>> without >>>>>>>>>>>>> any >>>>>>>>>>>>> solution >>>>>>>>>>>>> >>>>>>>>>>>>> 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. . >>>>>>>>>>>>> >>>>>>>>>>>>> --pk >>>>>>>>>>>>> >>>>>>>>>>>>> [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=(null),cpuset=/,mems_allowed=0 >>>>>>>>>>>>> [ 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+0xb10/0 >>>>>>>>>>>>> xb50 >>>>>>>>>>>>> [ 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 = 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) = >>>>>>>>>>>>> 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) = 5893600kB >>>>>>>>>>>>> [ 30.370129] Node 0 hugepages_total=0 hugepages_free=0 >>>>>>>>>>>>> hugepages_surp=0 hugepages_size=1048576kB >>>>>>>>>>>>> [ 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 = 0kB >>>>>>>>>>>>> [ 30.370136] Total swap = 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 >>>>>>>>>>>> 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. >>>>>>>>>>> >>>>>>>>>>> I am also using a ThunderX2 platform with latest makedumpfile >>>>>>>>>>> code and >>>>>>>>>>> kexec-tools (with the suggested patch >>>>>>>>>>> < >>>>>>>>>>> >>> https://urldefense.com/v3/__https://lists.infradead.org/pipermail/kexec/2020-May/025128.html__;!!GqivPVa7Brio!J6lUig58-Gw6TKZnEEYzEeSU36T-1SqlB1kImU00xtX_lss5Tx-JbUmLE9TJC3foXBLg$ >>>>>>>>>>>> ). >>>>>>>>>>> Thanks, >>>>>>>>>>> Bhupesh >>>>>>>>>> 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’t recall the exact platform. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> For this failure , >>>>>>>>>> >>>>>>>>>>>>> DMA: failed to allocate 256 KiB pool for atomic >>>>>>>>>>>>> coherent allocation >>>>>>>>>> Is due to : >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> 3618082c >>>>>>>>>> ("arm64 use both ZONE_DMA and ZONE_DMA32") >>>>>>>>>> >>>>>>>>>> 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. >>>>>>>>>> >>>>>>>>>> It is due to having this CONFIG item ON : >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> CONFIG_ZONE_DMA=y >>>>>>>>>> >>>>>>>>>> Turning off ZONE_DMA fixes a issue and Raspberry PI 4 will >>>>>>>>>> use the device tree to specify memory below 1G. >>>>>>>>>> >>>>>>>>>> >>>>>>>>> Disabling ZONE_DMA is temporary solution. We may need proper >>>>>>>>> solution >>>>>>>> Perhaps the Raspberry platform configuration dependencies need >>>>>>>> separated from “server class” Arm equipment ? Or auto-configured on >>>>>>>> boot ? Consult an expert ;-) >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>>> I would like to see Chen’s 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. >>>>>>>>> >>>>>>>>> Issue mentioned by me happens with or without this patch. >>>>>>>>> >>>>>>>>> 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 >>>>>>>>> >>>>>>>>> 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; >>>>>>>>> } >>>>>>>>> >>>>>>>>> - low_base = memblock_find_in_range(0, 1ULL << 32, low_size, >>>>>>>>> CRASH_ALIGN); >>>>>>>>> + low_base = 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)); >>>>>>>>> >>>>>>>>> >>>>>>>> I suspect 0xc0000000 would need to be a CONFIG item and not >>>>>>>> hard-coded. >>>>>>>> >>>>>>> if you consider this as valid change, can you please incorporate as >>>>>>> part of your patch-set. >>>>>> After commit 1a8e1cef7 ("arm64: use both ZONE_DMA and ZONE_DMA32")，the 0- >>>>>> 4G memory is splited >>>>>> to DMA [mem 0x0000000000000000-0x000000003fffffff] and DMA32 [mem >>>>>> 0x0000000040000000-0x00000000ffffffff] on arm64. >>>>>> >>>>>> From 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. >>>>>> >>>>>> I have a question, why do you choose 0xc0000000 here? >>>>>> >>>>>> Besides, this is common code, we also need to consider about x86. >>>>>> >>>>> + nsaenzjulienne@suse.de >>> Thanks for adding me to the conversation, and sorry for the headaches. >>> >>>>> Exactly . This is why it needs to be a CONFIG option for Raspberry >>>>> .., or device tree option. >>>>> >>>>> >>>>> We could revert 1a8e1cef7 since it broke Arm kdump too. >>>> Well, unfortunately the patch for commit 1a8e1cef7603 ("arm64: use >>>> both ZONE_DMA and ZONE_DMA32") was not Cc'ed to the kexec mailing >>>> list, thus we couldn't get many eyes on it for a thorough review from >>>> kexec/kdump p-o-v. >>>> >>>> Also we historically never had distinction in common arch code on the >>>> basis of the intended end use-case: embedded, server or automotive, so >>>> I am not sure introducing a Raspberry specific CONFIG option would be >>>> a good idea. >>> +1 >>> >>> From the distros perspective it's very important to keep a single kernel image. >>> >>>> So, rather than reverting the patch, we can look at addressing the >>>> same properly this time - especially from a kdump p-o-v. >>>> This issue has been reported by some Red Hat arm64 partners with >>>> upstream kernel also and as we have noticed in the past as well, >>>> hardcoding the placement of the crashkernel base address (unless the >>>> base address is specified by a crashkernel=X@Y like bootargs) is also >>>> not a portable suggestion. >>>> >>>> I am working on a possible fix and will have more updates on the same >>>> in a day-or-two. >>> Please keep me in the loop, we've also had issues pointing to this reported by >>> SUSE partners. I can do some testing both on the RPi4 and on big servers that >>> need huge crashkernel sizes. >>> >>> Regards, >>> Nicolas >>> >> Hi >> >> Has there been any progress on this ? It appears we are stalled because Nicolas's and Chen's changes are not compatible . One is needed for RPi4 and the other for server class equipment. >> >> >> Thanks, >> >> John >> >> > Hi all, > > Thanks for John's reminder. > commit 1a8e1cef7 ("arm64: use both ZONE_DMA and ZONE_DMA32") broken the arm64 kdump, > there is a simple solution similar to pk's to fix this, see below: > > In crash dump kernel, if the peripherals need to use ZONE_DMA like the the Raspberry Pi 4, based on > my solution, we adjusted the memory range in memblock_find_in_range. > > diff --git a/kernel/crash_core.c b/kernel/crash_core.c > index a7580d291c37..eb16c6d54b73 100644 > --- a/kernel/crash_core.c > +++ b/kernel/crash_core.c > @@ -320,6 +320,7 @@ int __init reserve_crashkernel_low(void) > unsigned long long base, low_base = 0, low_size = 0; > unsigned long total_low_mem; > int ret; > + phys_addr_t crash_max = 1ULL << 32; > > total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT)); > > @@ -352,7 +353,12 @@ int __init reserve_crashkernel_low(void) > return 0; > } > > - low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN); > +#ifdef CONFIG_ARM64 > + if (IS_ENABLED(CONFIG_ZONE_DMA)) { > + crash_max = arm64_dma_phys_limit; > + } > +#endif > + low_base = memblock_find_in_range(0, crash_max, 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)); > > > Thanks, > Chen Zhou > Hi, I don't have any objections to this proposal. >> . >> > 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=-5.2 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,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org 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, Nicolas Saenz Julienne , Bhupesh Sharma 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> <8E0D45DC-12BF-437D-A342-03E974D9C6D4@oracle.com> <751bbe2512628ff38002db33ce02af051d080cd2.camel@suse.de> <8ca6c3e9-b8ab-77c3-a1d3-beb513c22f1b@oracle.com> <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> From: John Donnelly Message-ID: <437140b8-e0f8-97a4-307d-fe7c304b37be@oracle.com> Date: Fri, 19 Jun 2020 19:01:14 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9657 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 phishscore=0 mlxscore=0 bulkscore=0 malwarescore=0 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<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> <8E0D45DC-12BF-437D-A342-03E974D9C6D4@oracle.com> <751bbe2512628ff38002db33ce02af051d080cd2.camel@suse.de> <8ca6c3e9-b8ab-77c3-a1d3-beb513c22f1b@oracle.com> <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> From: John Donnelly Message-ID: <437140b8-e0f8-97a4-307d-fe7c304b37be@oracle.com> Date: Fri, 19 Jun 2020 19:01:14 -0500 MIME-Version: 1.0 In-Reply-To: <03929ef5-7044-5610-c207-e497d3994f49@huawei.com> Content-Language: en-US List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: chenzhou , Nicolas Saenz Julienne , Bhupesh Sharma Cc: Devicetree List , Arnd Bergmann , Baoquan He , Linux Doc Mailing List , Catalin Marinas , RuiRui Yang , Prabhakar Kushwaha , 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 Ck9uIDYvMTkvMjAgMzoyMSBBTSwgY2hlbnpob3Ugd3JvdGU6Cj4gT24gMjAyMC82LzE5IDEwOjMy LCBKb2huIERvbm5lbGx5IHdyb3RlOgo+PiBPbiA2LzQvMjAgMTI6MDEgUE0sIE5pY29sYXMgU2Fl bnogSnVsaWVubmUgd3JvdGU6Cj4+PiBPbiBUaHUsIDIwMjAtMDYtMDQgYXQgMDE6MTcgKzA1MzAs IEJodXBlc2ggU2hhcm1hIHdyb3RlOgo+Pj4+IEhpIEFsbCwKPj4+Pgo+Pj4+IE9uIFdlZCwgSnVu IDMsIDIwMjAgYXQgOTowMyBQTSBKb2huIERvbm5lbGx5IDxqb2huLnAuZG9ubmVsbHlAb3JhY2xl LmNvbT4KPj4+PiB3cm90ZToKPj4+Pj4+IE9uIEp1biAzLCAyMDIwLCBhdCA4OjIwIEFNLCBjaGVu emhvdSA8Y2hlbnpob3UxMEBodWF3ZWkuY29tPiB3cm90ZToKPj4+Pj4+Cj4+Pj4+PiBIaSwKPj4+ Pj4+Cj4+Pj4+Pgo+Pj4+Pj4gT24gMjAyMC82LzMgMTk6NDcsIFByYWJoYWthciBLdXNod2FoYSB3 cm90ZToKPj4+Pj4+PiBIaSBDaGVuLAo+Pj4+Pj4+Cj4+Pj4+Pj4gT24gVHVlLCBKdW4gMiwgMjAy 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