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| author | WeiXiong Liao <liaoweixiong@allwinnertech.com> | 2020-03-25 16:55:06 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-05-31 19:49:01 -0700 |
| commit | 78c08247b9d3e03192f8b359aa079024e805a948 (patch) | |
| tree | ebc4c79461299d67d159c672c86b52e6b6c8acc7 /drivers/mtd/Kconfig | |
| parent | f8feafeaeedbf0a324c373c5fa29a2098a69c458 (diff) | |
| download | linux-78c08247b9d3e03192f8b359aa079024e805a948.tar.gz | |
mtd: Support kmsg dumper based on pstore/blk
This introduces mtdpstore, which is similar to mtdoops but more powerful. It uses pstore/blk, and aims to store panic and oops logs to a flash partition, where pstore can later read back and present as files in the mounted pstore filesystem. To make mtdpstore work, the "blkdev" of pstore/blk should be set as MTD device name or MTD device number. For more details, see Documentation/admin-guide/pstore-blk.rst This solves a number of issues: - Work duplication: both of pstore and mtdoops do the same job storing panic/oops log. They have very similar logic, registering to kmsg dumper and storing logs to several chunks one by one. - Layer violations: drivers should provides methods instead of polices. MTD should provide read/write/erase operations, and allow a higher level drivers to provide the chunk management, kmsg dump configuration, etc. - Missing features: pstore provides many additional features, including presenting the logs as files, logging dump time and count, and supporting other frontends like pmsg, console, etc. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-11-keescook@chromium.org/ Link: https://lore.kernel.org/r/1589266715-4168-1-git-send-email-liaoweixiong@allwinnertech.com Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'drivers/mtd/Kconfig')
| -rw-r--r-- | drivers/mtd/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index 42d401ea60ee..6ddab796216d 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -170,6 +170,16 @@ config MTD_OOPS buffer in a flash partition where it can be read back at some later point. +config MTD_PSTORE + tristate "Log panic/oops to an MTD buffer based on pstore" + depends on PSTORE_BLK + help + This enables panic and oops messages to be logged to a circular + buffer in a flash partition where it can be read back as files after + mounting pstore filesystem. + + If unsure, say N. + config MTD_SWAP tristate "Swap on MTD device support" depends on MTD && SWAP |