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Message-Id: <20211017141700.61201-4-david@ixit.cz>
Date: Sun, 17 Oct 2021 16:17:00 +0200
From: David Heidelberg <david@...t.cz>
To: Rob Herring <robh+dt@...nel.org>,
Kees Cook <keescook@...omium.org>,
Anton Vorontsov <anton@...msg.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
~okias/devicetree@...ts.sr.ht, David Heidelberg <david@...t.cz>
Subject: [PATCH v3 4/4] dt-bindings: reserved-memory: ramoops: Convert txt bindings to yaml
Convert ramoops driver to the YAML syntax.
Signed-off-by: David Heidelberg <david@...t.cz>
---
v2:
- inherit reserved-memory properties
- switch to unevaluatedProperties
v3:
- add type references
- enum -> oneOf
- define maximum for max-reason
- fixed max-reason node and remove accidentally created param: node
- example: add root node
.../bindings/reserved-memory/ramoops.txt | 66 --------
.../bindings/reserved-memory/ramoops.yaml | 145 ++++++++++++++++++
2 files changed, 145 insertions(+), 66 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/reserved-memory/ramoops.txt
create mode 100644 Documentation/devicetree/bindings/reserved-memory/ramoops.yaml
diff --git a/Documentation/devicetree/bindings/reserved-memory/ramoops.txt b/Documentation/devicetree/bindings/reserved-memory/ramoops.txt
deleted file mode 100644
index b571ef6dab0f..000000000000
--- a/Documentation/devicetree/bindings/reserved-memory/ramoops.txt
+++ /dev/null
@@ -1,66 +0,0 @@
-Ramoops oops/panic logger
-=========================
-
-ramoops provides persistent RAM storage for oops and panics, so they can be
-recovered after a reboot. This is a child-node of "/reserved-memory", and
-is named "ramoops" after the backend, rather than "pstore" which is the
-subsystem.
-
-Parts of this storage may be set aside for other persistent log buffers, such
-as kernel log messages, or for optional ECC error-correction data. The total
-size of these optional buffers must fit in the reserved region.
-
-Any remaining space will be used for a circular buffer of oops and panic
-records. These records have a configurable size, with a size of 0 indicating
-that they should be disabled.
-
-At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
-must be set non-zero, but are otherwise optional as listed below.
-
-
-Required properties:
-
-- compatible: must be "ramoops"
-
-- reg: region of memory that is preserved between reboots
-
-
-Optional properties:
-
-- ecc-size: enables ECC support and specifies ECC buffer size in bytes
- (defaults to 0: no ECC)
-
-- record-size: maximum size in bytes of each kmsg dump.
- (defaults to 0: disabled)
-
-- console-size: size in bytes of log buffer reserved for kernel messages
- (defaults to 0: disabled)
-
-- ftrace-size: size in bytes of log buffer reserved for function tracing and
- profiling (defaults to 0: disabled)
-
-- pmsg-size: size in bytes of log buffer reserved for userspace messages
- (defaults to 0: disabled)
-
-- mem-type: if present, sets the type of mapping is to be used to map the
- reserved region. mem-type: 0 = write-combined (default), 1 = unbuffered,
- 2 = cached.
-
-- unbuffered: deprecated, use mem_type instead. If present, and mem_type is
- not specified, it is equivalent to mem_type = 1 and uses unbuffered mappings
- to map the reserved region (defaults to buffered mappings mem_type = 0). If
- both are specified -- "mem_type" overrides "unbuffered".
-
-- max-reason: if present, sets maximum type of kmsg dump reasons to store
- (defaults to 2: log Oopses and Panics). This can be set to INT_MAX to
- store all kmsg dumps. See include/linux/kmsg_dump.h KMSG_DUMP_* for other
- kmsg dump reason values. Setting this to 0 (KMSG_DUMP_UNDEF), means the
- reason filtering will be controlled by the printk.always_kmsg_dump boot
- param: if unset, it will be KMSG_DUMP_OOPS, otherwise KMSG_DUMP_MAX.
-
-- no-dump-oops: deprecated, use max_reason instead. If present, and
- max_reason is not specified, it is equivalent to max_reason = 1
- (KMSG_DUMP_PANIC).
-
-- flags: if present, pass ramoops behavioral flags (defaults to 0,
- see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).
diff --git a/Documentation/devicetree/bindings/reserved-memory/ramoops.yaml b/Documentation/devicetree/bindings/reserved-memory/ramoops.yaml
new file mode 100644
index 000000000000..f4c351a69542
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/ramoops.yaml
@@ -0,0 +1,145 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/reserved-memory/ramoops.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Ramoops oops/panic logger
+
+description: |
+ ramoops provides persistent RAM storage for oops and panics, so they can be
+ recovered after a reboot. This is a child-node of "/reserved-memory", and
+ is named "ramoops" after the backend, rather than "pstore" which is the
+ subsystem.
+
+ Parts of this storage may be set aside for other persistent log buffers, such
+ as kernel log messages, or for optional ECC error-correction data. The total
+ size of these optional buffers must fit in the reserved region.
+
+ Any remaining space will be used for a circular buffer of oops and panic
+ records. These records have a configurable size, with a size of 0 indicating
+ that they should be disabled.
+
+ At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
+ must be set non-zero, but are otherwise optional as listed below.
+
+maintainers:
+ - Kees Cook <keescook@...omium.org>
+
+allOf:
+ - $ref: "reserved-memory.yaml"
+
+properties:
+ compatible:
+ const: ramoops
+
+ reg:
+ description: region of memory that is preserved between reboots
+
+ ecc-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: enables ECC support and specifies ECC buffer size in bytes
+ default: 0 # no ECC
+
+ record-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: maximum size in bytes of each kmsg dump
+ default: 0
+
+ console-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: size in bytes of log buffer reserved for kernel messages
+ default: 0
+
+ ftrace-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: size in bytes of log buffer reserved for function tracing and profiling
+ default: 0
+
+ pmsg-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: size in bytes of log buffer reserved for userspace messages
+ default: 0
+
+ mem-type:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: if present, sets the type of mapping is to be used to map the reserved region.
+ default: 0
+ oneOf:
+ - const: 0
+ description: write-combined
+ - const: 1
+ description: unbuffered
+ - const: 2
+ description: cached
+
+ max-reason:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 2 # log oopses and panics
+ maximum: 0x7fffffff
+ description: |
+ If present, sets maximum type of kmsg dump reasons to store.
+ This can be set to INT_MAX to store all kmsg dumps.
+ See include/linux/kmsg_dump.h KMSG_DUMP_* for other kmsg dump reason values.
+ Setting this to 0 (KMSG_DUMP_UNDEF), means the reason filtering will be
+ controlled by the printk.always_kmsg_dump boot param.
+ If unset, it will be 2 (KMSG_DUMP_OOPS), otherwise 5 (KMSG_DUMP_MAX).
+
+ flags:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 0
+ description: |
+ If present, pass ramoops behavioral flags
+ (see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).
+
+ no-dump-oops:
+ deprecated: true
+ type: boolean
+ description: |
+ Use max_reason instead. If present, and max_reason is not specified,
+ it is equivalent to max_reason = 1 (KMSG_DUMP_PANIC).
+
+ unbuffered:
+ deprecated: true
+ type: boolean
+ description: |
+ Use mem_type instead. If present, and mem_type is not specified,
+ it is equivalent to mem_type = 1 and uses unbuffered mappings to map
+ the reserved region (defaults to buffered mappings mem_type = 0).
+ If both are specified -- "mem_type" overrides "unbuffered".
+
+unevaluatedProperties: false
+
+required:
+ - compatible
+ - reg
+
+anyOf:
+ - required: [record-size]
+ - required: [console-size]
+ - required: [ftrace-size]
+ - required: [pmsg-size]
+
+examples:
+ - |
+ / {
+ compatible = "foo";
+ model = "foo";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ reserved-memory {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ ramoops@...f0000 {
+ compatible = "ramoops";
+ reg = <0xbfdf0000 0x10000>; /* 64kB */
+ console-size = <0x8000>; /* 32kB */
+ record-size = <0x400>; /* 1kB */
+ ecc-size = <16>;
+ };
+ };
+ };
+
--
2.33.0
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