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From: Xianting Tian <xianting.tian@linux.alibaba.com>
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 <xianting.tian@linux.alibaba.com>
Subject: [PATCH V6 5/6] RISC-V: Add arch_crash_save_vmcoreinfo support
Date: Thu, 11 Aug 2022 15:41:49 +0800	[thread overview]
Message-ID: <20220811074150.3020189-6-xianting.tian@linux.alibaba.com> (raw)
In-Reply-To: <20220811074150.3020189-1-xianting.tian@linux.alibaba.com>

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 = 5
 *      PAGE_OFFSET = 0xff60000000000000
 * Linux Kernel 5.17 ~
 *      PGTABLE_LEVELS = 4
 *      PAGE_OFFSET = 0xffffaf8000000000
 * Linux Kernel 4.19 ~
 *      PGTABLE_LEVELS = 3
 *      PAGE_OFFSET = 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 <xianting.tian@linux.alibaba.com>
---
 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 33bb60a354cd..5e149df58176 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_KGDB)		+= kgdb.o
 obj-$(CONFIG_KEXEC_CORE)	+= kexec_relocate.o crash_save_regs.o machine_kexec.o
 obj-$(CONFIG_KEXEC_FILE)	+= elf_kexec.o machine_kexec_file.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
+obj-$(CONFIG_CRASH_CORE)	+= crash_core.o
 
 obj-$(CONFIG_JUMP_LABEL)	+= jump_label.o
 
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 <linux/crash_core.h>
+#include <linux/pagemap.h>
+
+void arch_crash_save_vmcoreinfo(void)
+{
+	VMCOREINFO_NUMBER(VA_BITS);
+	VMCOREINFO_NUMBER(phys_ram_base);
+
+	vmcoreinfo_append_str("NUMBER(PAGE_OFFSET)=0x%lx\n", PAGE_OFFSET);
+	vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", VMALLOC_START);
+	vmcoreinfo_append_str("NUMBER(VMALLOC_END)=0x%lx\n", VMALLOC_END);
+	vmcoreinfo_append_str("NUMBER(VMEMMAP_START)=0x%lx\n", VMEMMAP_START);
+	vmcoreinfo_append_str("NUMBER(VMEMMAP_END)=0x%lx\n", VMEMMAP_END);
+#ifdef CONFIG_64BIT
+	vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=0x%lx\n", MODULES_VADDR);
+	vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END);
+#endif
+
+	if (IS_ENABLED(CONFIG_64BIT)) {
+#ifdef CONFIG_KASAN
+		vmcoreinfo_append_str("NUMBER(KASAN_SHADOW_START)=0x%lx\n", KASAN_SHADOW_START);
+		vmcoreinfo_append_str("NUMBER(KASAN_SHADOW_END)=0x%lx\n", KASAN_SHADOW_END);
+#endif
+		vmcoreinfo_append_str("NUMBER(KERNEL_LINK_ADDR)=0x%lx\n", KERNEL_LINK_ADDR);
+		vmcoreinfo_append_str("NUMBER(ADDRESS_SPACE_END)=0x%lx\n", ADDRESS_SPACE_END);
+	}
+}
-- 
2.17.1


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  parent reply	other threads:[~2022-08-11  7:42 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-11  7:41 [PATCH V6 0/6] RISC-V fixups to work with crash tool Xianting Tian
2022-08-11  7:41 ` [PATCH V6 1/6] RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context Xianting Tian
2022-08-11  7:41 ` [PATCH V6 2/6] RISC-V: Fixup get incorrect user mode PC for kernel mode regs Xianting Tian
2022-08-11  7:41 ` [PATCH V6 3/6] RISC-V: Fixup schedule out issue in machine_crash_shutdown() Xianting Tian
2022-08-11  7:41 ` [PATCH V6 4/6] RISC-V: Add modules to virtual kernel memory layout dump Xianting Tian
2022-08-11  7:41 ` Xianting Tian [this message]
2022-08-11  7:41 ` [PATCH V6 6/6] Documentation: kdump: describe VMCOREINFO export for RISCV64 Xianting Tian
2022-08-11 13:27   ` Bagas Sanjaya
2022-08-11 15:45 ` [PATCH V6 0/6] RISC-V fixups to work with crash tool Conor.Dooley
2022-08-11 16:17 ` Palmer Dabbelt
2022-08-12  3:23   ` Xianting Tian
2022-09-15 18:57     ` Conor.Dooley
2022-10-12  9:42   ` Xianting Tian
2022-10-12  9:52     ` Conor Dooley
2022-10-13  2:28       ` Xianting Tian
2022-10-13  5:24         ` Conor Dooley
2022-10-13  9:26           ` Xianting Tian
2022-10-14  7:53           ` Xianting Tian

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