iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges

Browse Source 
The following interrelated ranges are needed by the kdump crash tool:
	MODULES_VADDR ~ MODULES_END,
	VMALLOC_START ~ VMALLOC_END,
	VMEMMAP_START ~ VMEMMAP_END

Since these values change from time to time, it is preferable to export
them via vmcoreinfo than to change the crash's code frequently.

Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20220209092642.9181-1-shijie@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Huang Shijie 2022-02-09 09:26:42 +00:00 committed by Will Deacon
parent a8a733b201
commit 2369f171d5
2 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/admin-guide/kdump/vmcoreinfo.rst
View File

@ -494,6 +494,14 @@ architecture which is used to lookup the page-tables for the Virtual
addresses in the higher VA range (refer to ARMv8 ARM document for addresses in the higher VA range (refer to ARMv8 ARM document for
more details). more details).
MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END
-------------
Used to get the correct ranges:
MODULES_VADDR ~ MODULES_END-1 : Kernel module space.
VMALLOC_START ~ VMALLOC_END-1 : vmalloc() / ioremap() space.
VMEMMAP_START ~ VMEMMAP_END-1 : vmemmap region, used for struct page array.
arm arm
=== ===

6
arch/arm64/kernel/crash_core.c
View File

@ -20,6 +20,12 @@ void arch_crash_save_vmcoreinfo(void)
{ {
VMCOREINFO_NUMBER(VA_BITS); VMCOREINFO_NUMBER(VA_BITS);
/* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */ /* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */
vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=0x%lx\n", MODULES_VADDR);
vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END);
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);
vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n", vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n",
kimage_voffset); kimage_voffset);
vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n", vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n",