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authorXianting Tian <xianting.tian@linux.alibaba.com>2022-10-26 16:42:08 +0200
committerPalmer Dabbelt <palmer@rivosinc.com>2022-12-03 01:48:58 +0100
commitc5b4216929ebc8ac9107a373db65babc14ba4e80 (patch)
tree8c155c007fdc9842c7cb9d2fb3030f090b03b41c /Documentation/admin-guide/kdump
parentRISC-V: Add arch_crash_save_vmcoreinfo support (diff)
downloadlinux-c5b4216929ebc8ac9107a373db65babc14ba4e80.tar.xz
linux-c5b4216929ebc8ac9107a373db65babc14ba4e80.zip
Documentation: kdump: describe VMCOREINFO export for RISCV64
The following interrelated definitions and ranges are needed by the kdump crash tool, which are exported by "arch/riscv/kernel/crash_core.c": VA_BITS, PAGE_OFFSET, phys_ram_base, KERNEL_LINK_ADDR, MODULES_VADDR ~ MODULES_END, VMALLOC_START ~ VMALLOC_END, VMEMMAP_START ~ VMEMMAP_END, Document these RISCV64 exports above. Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com> Acked-by: Baoquan He <bhe@redhat.com> Link: https://lore.kernel.org/r/20221026144208.373504-3-xianting.tian@linux.alibaba.com [Palmer: wrap commit text] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'Documentation/admin-guide/kdump')
-rw-r--r--Documentation/admin-guide/kdump/vmcoreinfo.rst29
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
index 6726f439958c..86fd88492870 100644
--- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
+++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
@@ -595,3 +595,32 @@ X2TLB
-----
Indicates whether the crashed kernel enabled SH extended mode.
+
+RISCV64
+=======
+
+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 the 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|KERNEL_LINK_ADDR
+----------------------------------------------------------------------------------------------
+
+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 space, used for struct page array.
+ * KERNEL_LINK_ADDR : start address of Kernel link and BPF