From mboxrd@z Thu Jan 1 00:00:00 1970 From: liaoweixiong Subject: [RFC v9 2/5] dt-bindings: pstore-block: new support for blkoops Date: Tue, 19 Feb 2019 19:52:47 +0800 Message-ID: <1550577170-18761-3-git-send-email-liaoweixiong@allwinnertech.com> References: <1550577170-18761-1-git-send-email-liaoweixiong@allwinnertech.com> Return-path: In-Reply-To: <1550577170-18761-1-git-send-email-liaoweixiong@allwinnertech.com> Sender: linux-kernel-owner@vger.kernel.org To: Kees Cook , Anton Vorontsov , Colin Cross , Tony Luck , Jonathan Corbet , Rob Herring , Mark Rutland , liaoweixiong , Mauro Carvalho Chehab , "David S. Miller" , Greg Kroah-Hartman , Nicolas Ferre , Arnd Bergmann Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org Create DT binding document for blkoops. Signed-off-by: liaoweixiong --- .../devicetree/bindings/pstore/blkoops.txt | 53 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/pstore/blkoops.txt diff --git a/Documentation/devicetree/bindings/pstore/blkoops.txt b/Documentation/devicetree/bindings/pstore/blkoops.txt new file mode 100644 index 0000000..5462915 --- /dev/null +++ b/Documentation/devicetree/bindings/pstore/blkoops.txt @@ -0,0 +1,53 @@ +Blkoops oops logger +=================== + +Blkoops provides a block partition for oops, excluding panics now, so they can +be recovered after a reboot. + +Any space of block device will be used for a circular buffer of oops records. +These records have a configurable size, with a size of 0 indicating that they +should be disabled. + +At least one of "block-device" and "total_size" must be set. + +At least one of "dmesg-size" or "pmsg-size" must be set non-zero. + +Required properties: + +- compatible: must be "blkoops". + +Optional properties: + +- block-device: The block device to use. Most of the time, it is a partition of + device. If block-device is NULL, no block device is effective + and the data will be lost after rebooting. + It accept the following variants: + 1) device number in hexadecimal + represents itself no leading 0x, for example b302. + 2) /dev/ represents the device number of disk + 3) /dev/ represents the device number of + partition - device number of disk plus the partition number + 4) /dev/p - same as the above, that form is + used when disk name of partitioned disk ends on a digit. + 5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing + the unique id of a partition if the partition table provides + it. The UUID may be either an EFI/GPT UUID, or refer to an + MSDOS partition using the format SSSSSSSS-PP, where SSSSSSSS + is a zero-filled hex representation of the 32-bit + "NT disk signature", and PP is a zero-filled hex + representation of the 1-based partition number. + 6) PARTUUID=/PARTNROFF= to select a partition in + relation to a partition with a known unique id. + 7) : major and minor number of the device + separated by a colon. + +- total-size: The total size in kbytes pstore/blk can use. It must be a multiple + of 4. It must be less than or equal to size of block-device. If + total-size is zero with block-devce valid, it will be set to equal + to size of block-device. + +- dmesg-size: maximum size in kbytes of each dump done on oops, which must be a + multiple of 4. + +- pmsg-size: maximum size in kbytes for userspace messages, which must be a + multiple of 4. diff --git a/MAINTAINERS b/MAINTAINERS index 51029a4..f49dd37 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12318,6 +12318,7 @@ F: drivers/firmware/efi/efi-pstore.c F: drivers/acpi/apei/erst.c F: Documentation/admin-guide/ramoops.rst F: Documentation/devicetree/bindings/reserved-memory/ramoops.txt +F: Documentation/devicetree/bindings/pstore-block/ K: \b(pstore|ramoops) PTP HARDWARE CLOCK SUPPORT -- 1.9.1