145 lines
4.3 KiB
YAML
145 lines
4.3 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/reserved-memory/ramoops.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Ramoops oops/panic logger
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description: |
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ramoops provides persistent RAM storage for oops and panics, so they can be
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recovered after a reboot. This is a child-node of "/reserved-memory", and
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is named "ramoops" after the backend, rather than "pstore" which is the
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subsystem.
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Parts of this storage may be set aside for other persistent log buffers, such
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as kernel log messages, or for optional ECC error-correction data. The total
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size of these optional buffers must fit in the reserved region.
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Any remaining space will be used for a circular buffer of oops and panic
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records. These records have a configurable size, with a size of 0 indicating
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that they should be disabled.
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At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
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must be set non-zero, but are otherwise optional as listed below.
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maintainers:
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- Kees Cook <keescook@chromium.org>
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allOf:
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- $ref: reserved-memory.yaml
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properties:
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compatible:
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const: ramoops
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reg:
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description: region of memory that is preserved between reboots
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ecc-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: enables ECC support and specifies ECC buffer size in bytes
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default: 0 # no ECC
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record-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: maximum size in bytes of each kmsg dump
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default: 0
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console-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: size in bytes of log buffer reserved for kernel messages
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default: 0
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ftrace-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: size in bytes of log buffer reserved for function tracing and profiling
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default: 0
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pmsg-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: size in bytes of log buffer reserved for userspace messages
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default: 0
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mem-type:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: if present, sets the type of mapping is to be used to map the reserved region.
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default: 0
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oneOf:
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- const: 0
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description: write-combined
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- const: 1
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description: unbuffered
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- const: 2
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description: cached
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max-reason:
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$ref: /schemas/types.yaml#/definitions/uint32
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default: 2 # log oopses and panics
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maximum: 0x7fffffff
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description: |
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If present, sets maximum type of kmsg dump reasons to store.
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This can be set to INT_MAX to store all kmsg dumps.
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See include/linux/kmsg_dump.h KMSG_DUMP_* for other kmsg dump reason values.
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Setting this to 0 (KMSG_DUMP_UNDEF), means the reason filtering will be
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controlled by the printk.always_kmsg_dump boot param.
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If unset, it will be 2 (KMSG_DUMP_OOPS), otherwise 5 (KMSG_DUMP_MAX).
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flags:
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$ref: /schemas/types.yaml#/definitions/uint32
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default: 0
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description: |
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If present, pass ramoops behavioral flags
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(see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).
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no-dump-oops:
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deprecated: true
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type: boolean
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description: |
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Use max_reason instead. If present, and max_reason is not specified,
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it is equivalent to max_reason = 1 (KMSG_DUMP_PANIC).
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unbuffered:
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deprecated: true
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type: boolean
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description: |
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Use mem_type instead. If present, and mem_type is not specified,
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it is equivalent to mem_type = 1 and uses unbuffered mappings to map
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the reserved region (defaults to buffered mappings mem_type = 0).
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If both are specified -- "mem_type" overrides "unbuffered".
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unevaluatedProperties: false
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required:
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- compatible
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- reg
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anyOf:
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- required: [record-size]
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- required: [console-size]
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- required: [ftrace-size]
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- required: [pmsg-size]
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examples:
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- |
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/ {
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compatible = "foo";
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model = "foo";
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#address-cells = <1>;
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#size-cells = <1>;
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reserved-memory {
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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ramoops@bfdf0000 {
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compatible = "ramoops";
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reg = <0xbfdf0000 0x10000>; /* 64kB */
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console-size = <0x8000>; /* 32kB */
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record-size = <0x400>; /* 1kB */
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ecc-size = <16>;
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};
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};
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};
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