From nobody Tue Apr 7 09:18:10 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93BC2C4332F for ; Fri, 14 Oct 2022 07:48:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229967AbiJNHsn (ORCPT ); Fri, 14 Oct 2022 03:48:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229507AbiJNHsj (ORCPT ); Fri, 14 Oct 2022 03:48:39 -0400 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1341167246; Fri, 14 Oct 2022 00:48:37 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R851e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=xianting.tian@linux.alibaba.com;NM=1;PH=DS;RN=23;SR=0;TI=SMTPD_---0VS6v5D._1665733712; Received: from localhost.localdomain(mailfrom:xianting.tian@linux.alibaba.com fp:SMTPD_---0VS6v5D._1665733712) by smtp.aliyun-inc.com; Fri, 14 Oct 2022 15:48:33 +0800 From: Xianting Tian To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, anup@brainfault.org, heiko@sntech.de, guoren@kernel.org, mick@ics.forth.gr, alexandre.ghiti@canonical.com, bhe@redhat.com, vgoyal@redhat.com, dyoung@redhat.com, corbet@lwn.net, Conor.Dooley@microchip.com Cc: kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, crash-utility@redhat.com, heinrich.schuchardt@canonical.com, k-hagio-ab@nec.com, hschauhan@nulltrace.org, yixun.lan@gmail.com, Xianting Tian Subject: [PATCH 1/2] RISC-V: Add arch_crash_save_vmcoreinfo support Date: Fri, 14 Oct 2022 15:48:09 +0800 Message-Id: <20221014074810.4471-2-xianting.tian@linux.alibaba.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221014074810.4471-1-xianting.tian@linux.alibaba.com> References: <20221014074810.4471-1-xianting.tian@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Add arch_crash_save_vmcoreinfo(), which exports VM layout(MODULES, VMALLOC, VMEMMAP and KERNEL_LINK_ADDR ranges), va bits and ram base for vmcore. Default pagetable levels and PAGE_OFFSET aren't same for different kernel version as below. For default pagetable levels, it sets sv57 on defaultly in latest kernel and do fallback to try to set sv48 on boot time if sv57 is not supported in current hardware. For ram base, the default value is 0x80200000 for qemu riscv64 env, 0x200000 for riscv64 SoC platform(eg, SoC platform of RISC-V XuanTie 910 CPU). * Linux Kernel 5.18 ~ * PGTABLE_LEVELS =3D 5 * PAGE_OFFSET =3D 0xff60000000000000 * Linux Kernel 5.17 ~ * PGTABLE_LEVELS =3D 4 * PAGE_OFFSET =3D 0xffffaf8000000000 * Linux Kernel 4.19 ~ * PGTABLE_LEVELS =3D 3 * PAGE_OFFSET =3D 0xffffffe000000000 Since these configurations change from time to time and version to version, it is preferable to export them via vmcoreinfo than to change the crash's code frequently, it can simplify the development of crash tool. Signed-off-by: Xianting Tian --- arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/crash_core.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) create mode 100644 arch/riscv/kernel/crash_core.c diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile index db6e4b1294ba..4cf303a779ab 100644 --- a/arch/riscv/kernel/Makefile +++ b/arch/riscv/kernel/Makefile @@ -81,6 +81,7 @@ obj-$(CONFIG_KGDB) +=3D kgdb.o obj-$(CONFIG_KEXEC_CORE) +=3D kexec_relocate.o crash_save_regs.o machine_k= exec.o obj-$(CONFIG_KEXEC_FILE) +=3D elf_kexec.o machine_kexec_file.o obj-$(CONFIG_CRASH_DUMP) +=3D crash_dump.o +obj-$(CONFIG_CRASH_CORE) +=3D crash_core.o =20 obj-$(CONFIG_JUMP_LABEL) +=3D jump_label.o =20 diff --git a/arch/riscv/kernel/crash_core.c b/arch/riscv/kernel/crash_core.c new file mode 100644 index 000000000000..8d7f5ff108da --- /dev/null +++ b/arch/riscv/kernel/crash_core.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include + +void arch_crash_save_vmcoreinfo(void) +{ + VMCOREINFO_NUMBER(VA_BITS); + VMCOREINFO_NUMBER(phys_ram_base); + + vmcoreinfo_append_str("NUMBER(PAGE_OFFSET)=3D0x%lx\n", PAGE_OFFSET); + vmcoreinfo_append_str("NUMBER(VMALLOC_START)=3D0x%lx\n", VMALLOC_START); + vmcoreinfo_append_str("NUMBER(VMALLOC_END)=3D0x%lx\n", VMALLOC_END); + vmcoreinfo_append_str("NUMBER(VMEMMAP_START)=3D0x%lx\n", VMEMMAP_START); + vmcoreinfo_append_str("NUMBER(VMEMMAP_END)=3D0x%lx\n", VMEMMAP_END); +#ifdef CONFIG_64BIT + vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=3D0x%lx\n", MODULES_VADDR); + vmcoreinfo_append_str("NUMBER(MODULES_END)=3D0x%lx\n", MODULES_END); +#endif + + if (IS_ENABLED(CONFIG_64BIT)) { +#ifdef CONFIG_KASAN + vmcoreinfo_append_str("NUMBER(KASAN_SHADOW_START)=3D0x%lx\n", KASAN_SHAD= OW_START); + vmcoreinfo_append_str("NUMBER(KASAN_SHADOW_END)=3D0x%lx\n", KASAN_SHADOW= _END); +#endif + vmcoreinfo_append_str("NUMBER(KERNEL_LINK_ADDR)=3D0x%lx\n", KERNEL_LINK_= ADDR); + vmcoreinfo_append_str("NUMBER(ADDRESS_SPACE_END)=3D0x%lx\n", ADDRESS_SPA= CE_END); + } +} --=20 2.17.1 From nobody Tue Apr 7 09:18:10 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40F06C4332F for ; Fri, 14 Oct 2022 07:48:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbiJNHsu (ORCPT ); Fri, 14 Oct 2022 03:48:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229772AbiJNHsl (ORCPT ); Fri, 14 Oct 2022 03:48:41 -0400 Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3267167246; Fri, 14 Oct 2022 00:48:39 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046050;MF=xianting.tian@linux.alibaba.com;NM=1;PH=DS;RN=23;SR=0;TI=SMTPD_---0VS6v5Dj_1665733713; Received: from localhost.localdomain(mailfrom:xianting.tian@linux.alibaba.com fp:SMTPD_---0VS6v5Dj_1665733713) by smtp.aliyun-inc.com; Fri, 14 Oct 2022 15:48:34 +0800 From: Xianting Tian To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, anup@brainfault.org, heiko@sntech.de, guoren@kernel.org, mick@ics.forth.gr, alexandre.ghiti@canonical.com, bhe@redhat.com, vgoyal@redhat.com, dyoung@redhat.com, corbet@lwn.net, Conor.Dooley@microchip.com Cc: kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, crash-utility@redhat.com, heinrich.schuchardt@canonical.com, k-hagio-ab@nec.com, hschauhan@nulltrace.org, yixun.lan@gmail.com, Xianting Tian Subject: [PATCH 2/2] Documentation: kdump: describe VMCOREINFO export for RISCV64 Date: Fri, 14 Oct 2022 15:48:10 +0800 Message-Id: <20221014074810.4471-3-xianting.tian@linux.alibaba.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221014074810.4471-1-xianting.tian@linux.alibaba.com> References: <20221014074810.4471-1-xianting.tian@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The following interrelated definitions and ranges are needed by the kdump crash tool, they are exported by "arch/riscv/kernel/crash_core.c": VA_BITS, PAGE_OFFSET, phys_ram_base, MODULES_VADDR ~ MODULES_END, VMALLOC_START ~ VMALLOC_END, VMEMMAP_START ~ VMEMMAP_END, KASAN_SHADOW_START ~ KASAN_SHADOW_END, KERNEL_LINK_ADDR ~ ADDRESS_SPACE_END Document these RISCV64 exports above. Signed-off-by: Xianting Tian --- .../admin-guide/kdump/vmcoreinfo.rst | 31 +++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation= /admin-guide/kdump/vmcoreinfo.rst index 6726f439958c..6c7a1728de22 100644 --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst @@ -595,3 +595,34 @@ X2TLB ----- =20 Indicates whether the crashed kernel enabled SH extended mode. + +RISCV64 +=3D=3D=3D=3D=3D=3D=3D + +VA_BITS +------- + +The maximum number of bits for virtual addresses. Used to compute the +virtual memory ranges. + +PAGE_OFFSET +----------- + +Indicates the virtual kernel start address of direct-mapped RAM region. + +phys_ram_base +------------- + +Indicates the start physical RAM address. + +--------------------------------------------------------------------------= -------------------------------------------------------------------------- +MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_= END|KASAN_SHADOW_START|KASAN_SHADOW_END|KERNEL_LINK_ADDR|ADDRESS_SPACE_END +--------------------------------------------------------------------------= -------------------------------------------------------------------------- + +Used to get the correct ranges: + + * MODULES_VADDR ~ MODULES_END : Kernel module space. + * VMALLOC_START ~ VMALLOC_END : vmalloc() / ioremap() space. + * VMEMMAP_START ~ VMEMMAP_END : vmemmap region, used for struct page arr= ay. + * KASAN_SHADOW_START ~ KASAN_SHADOW_END : kasan shadow space. + * KERNEL_LINK_ADDR ~ ADDRESS_SPACE_END : Kernel link and BPF space. --=20 2.17.1