[Crash-utility] [PATCH 0/4] Add support to extract hardware device dumps from vmcore

[Surendra Mobiya]

When kernel panic happens and kdump crash kernel is loaded, device
drivers enabled in the kdump crash kernel collect device specific
snapshot of the hardware/firmware state of their underlying devices.
These snapshots are exported as ELF notes with note type NT_VMCOREDD
(i.e., 0x700) in vmcore [1].

This series of patches enhance crash utility to analyze and
extract these hardware specific device dumps from vmcore using
"dev" command.

Patches 1 and 2 enhance help -D to parse NT_VMCOREDD ELF notes
in ELF vmcore and KDUMP vmcore, respectively.

Patches 3 and 4 enhance dev command to analyze and extract
hardware specific device dumps from ELF vmcore and KDUMP vmcore,
respectively.

Suggestions and feedback will be much appreciated.

Thanks,
Surendra

[1] https://lkml.org/lkml/2018/5/2/190

---
rfc:
- Moved logic to extract device dumps from "devdump" to "dev" command,
  in patches 3 and 4.
- By default, device dumps are output to screen as hexdump, if output
  file is not provided.

Surendra Mobiya (4):
  parse NT_VMCOREDD ELF notes in ELF vmcore
  parse NT_VMCOREDD ELF notes in KDUMP vmcore
  enhance dev command to extract NT_VMCOREDD from ELF vmcore
  enhance dev command to extract NT_VMCOREDD from KDUMP vmcore

 defs.h     |  10 +++++
 dev.c      |  80 +++++++++++++++++++++++++++++++++++-
 diskdump.c |  84 ++++++++++++++++++++++++++++++++++++++
 help.c     |  23 ++++++++++-
 memory.c   |  10 +++++
 netdump.c  | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 netdump.h  |   3 ++
 vmcore.h   |  36 ++++++++++++++++
 8 files changed, 359 insertions(+), 5 deletions(-)
 create mode 100644 vmcore.h

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2.21.0