From: Chen Zhou <chenzhou10@huawei.com>
To: <tglx@linutronix.de>, <mingo@redhat.com>,
<catalin.marinas@arm.com>, <will@kernel.org>, <dyoung@redhat.com>,
<bhe@redhat.com>, <robh+dt@kernel.org>
Cc: <arnd@arndb.de>, <John.p.donnelly@oracle.com>,
<pkushwaha@marvell.com>, <horms@verge.net.au>,
<guohanjun@huawei.com>, <chenzhou10@huawei.com>,
<linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <kexec@lists.infradead.org>
Subject: [PATCH v8 5/5] dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump
Date: Thu, 21 May 2020 17:38:05 +0800 [thread overview]
Message-ID: <20200521093805.64398-6-chenzhou10@huawei.com> (raw)
In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com>
Add documentation for DT property used by arm64 kdump:
linux,low-memory-range.
"linux,low-memory-range" is an another memory region used for crash
dump kernel devices.
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
---
Documentation/devicetree/bindings/chosen.txt | 25 ++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 45e79172a646..bfe6fb6976e6 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt
@@ -103,6 +103,31 @@ While this property does not represent a real hardware, the address
and the size are expressed in #address-cells and #size-cells,
respectively, of the root node.
+linux,low-memory-range
+----------------------
+This property (arm64 only) holds a base address and size, describing a
+limited region below 4G. Similar to "linux,usable-memory-range", it is
+an another memory range which may be considered available for use by the
+kernel.
+
+e.g.
+
+/ {
+ chosen {
+ linux,low-memory-range = <0x0 0x70000000 0x0 0x10000000>;
+ linux,usable-memory-range = <0x202f 0xc0000000 0x0 0x40000000>;
+ };
+};
+
+The main usage is for crash dump kernel devices when reserving crashkernel
+above 4G. When reserving crashkernel above 4G, there may be two crash kernel
+regions, one is below 4G, the other is above 4G. In order to distinct from
+the high region, use this property to pass the low region.
+
+While this property does not represent a real hardware, the address
+and the size are expressed in #address-cells and #size-cells,
+respectively, of the root node.
+
linux,elfcorehdr
----------------
--
2.20.1
next prev parent reply other threads:[~2020-05-21 9:35 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 9:38 [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump Chen Zhou
2020-05-21 9:38 ` [PATCH v8 1/5] x86: kdump: move reserve_crashkernel_low() into crash_core.c Chen Zhou
2020-05-26 0:56 ` Baoquan He
2020-05-21 9:38 ` [PATCH v8 2/5] arm64: kdump: reserve crashkenel above 4G for crash dump kernel Chen Zhou
2020-05-26 0:59 ` Baoquan He
2020-05-21 9:38 ` [PATCH v8 3/5] arm64: kdump: add memory for devices by DT property, low-memory-range Chen Zhou
2020-05-21 9:38 ` [PATCH v8 4/5] kdump: update Documentation about crashkernel on arm64 Chen Zhou
2020-05-21 9:38 ` Chen Zhou [this message]
2020-05-21 13:29 ` [PATCH v8 5/5] dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump Rob Herring
2020-05-22 3:24 ` chenzhou
2020-05-26 21:18 ` Rob Herring
2020-05-29 16:11 ` James Morse
2020-06-20 3:54 ` chenzhou
2020-05-26 1:42 ` [PATCH v8 0/5] support reserving crashkernel above 4G on " Baoquan He
2020-05-26 2:28 ` chenzhou
2020-05-28 22:20 ` John Donnelly
2020-05-29 8:05 ` Will Deacon
2020-06-01 12:02 ` Prabhakar Kushwaha
2020-06-01 19:30 ` John Donnelly
2020-06-01 21:02 ` Bhupesh Sharma
2020-06-01 21:59 ` John Donnelly
2020-06-02 5:38 ` Prabhakar Kushwaha
2020-06-02 14:41 ` John Donnelly
2020-06-03 11:47 ` Prabhakar Kushwaha
2020-06-03 13:20 ` chenzhou
2020-06-03 15:30 ` John Donnelly
2020-06-03 19:47 ` Bhupesh Sharma
2020-06-04 7:14 ` Will Deacon
2020-06-04 17:01 ` Nicolas Saenz Julienne
2020-06-05 2:26 ` John Donnelly
2020-06-05 8:21 ` Nicolas Saenz Julienne
2020-06-19 2:32 ` John Donnelly
2020-06-19 8:21 ` chenzhou
2020-06-20 0:01 ` John Donnelly
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