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Message-ID: <20230726175000.2536220-3-chenjiahao16@huawei.com>
Date: Wed, 26 Jul 2023 17:50:00 +0000
From: Chen Jiahao <chenjiahao16@...wei.com>
To: <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
<kexec@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
<paul.walmsley@...ive.com>, <palmer@...belt.com>,
<conor.dooley@...rochip.com>, <guoren@...nel.org>,
<heiko@...ech.de>, <bjorn@...osinc.com>, <alex@...ti.fr>,
<akpm@...ux-foundation.org>, <atishp@...osinc.com>,
<bhe@...hat.com>, <thunder.leizhen@...wei.com>, <horms@...nel.org>
CC: <chenjiahao16@...wei.com>
Subject: [PATCH -next v9 2/2] docs: kdump: Update the crashkernel description for riscv
Now "crashkernel=" parameter on riscv has been updated to support
crashkernel=X,[high,low]. Through which we can reserve memory region
above/within 32bit addressible DMA zone.
Here update the parameter description accordingly.
Signed-off-by: Chen Jiahao <chenjiahao16@...wei.com>
Reviewed-by: Guo Ren <guoren@...nel.org>
Reviewed-by: Simon Horman <horms@...nel.org>
Reviewed-by: Zhen Lei <thunder.leizhen@...wei.com>
---
Documentation/admin-guide/kernel-parameters.txt | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a1457995fd41..bd519749968f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -862,7 +862,7 @@
memory region [offset, offset + size] for that kernel
image. If '@...set' is omitted, then a suitable offset
is selected automatically.
- [KNL, X86-64, ARM64] Select a region under 4G first, and
+ [KNL, X86-64, ARM64, RISCV] Select a region under 4G first, and
fall back to reserve region above 4G when '@...set'
hasn't been specified.
See Documentation/admin-guide/kdump/kdump.rst for further details.
@@ -875,14 +875,14 @@
Documentation/admin-guide/kdump/kdump.rst for an example.
crashkernel=size[KMG],high
- [KNL, X86-64, ARM64] range could be above 4G. Allow kernel
- to allocate physical memory region from top, so could
- be above 4G if system have more than 4G ram installed.
- Otherwise memory region will be allocated below 4G, if
- available.
+ [KNL, X86-64, ARM64, RISCV] range could be above 4G.
+ Allow kernel to allocate physical memory region from top,
+ so could be above 4G if system have more than 4G ram
+ installed. Otherwise memory region will be allocated
+ below 4G, if available.
It will be ignored if crashkernel=X is specified.
crashkernel=size[KMG],low
- [KNL, X86-64, ARM64] range under 4G. When crashkernel=X,high
+ [KNL, X86-64, ARM64, RISCV] range under 4G. When crashkernel=X,high
is passed, kernel could allocate physical memory region
above 4G, that cause second kernel crash on system
that require some amount of low memory, e.g. swiotlb
@@ -893,6 +893,7 @@
size is platform dependent.
--> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
--> arm64: 128MiB
+ --> riscv: 128MiB
This one lets the user specify own low range under 4G
for second kernel instead.
0: to disable low allocation.
--
2.34.1
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