[PATCH v4 2nd 0/4] pstore: ramoops: support multiple pmsg instances

[Nobuhiro Iwamatsu]

The following series implements multiple pmsg. This feature allows userspace
program to control individual content aging or priority.

If a pstore backend module(e.g. ramoops) requires the multiple pmsg instances
when registering itself to pstore, multiple /dev/pmsg[ID] are created. Writes
to each /dev/pmsg[ID] are isolated each other. After reboot, the contents are
available in /sys/fs/pstore/pmsg-[backend]-[ID].

In addition, we add multiple pmsg support for ramoops. We can specify multiple
pmsg area size by its module parameter as follows.

 pmsg_size=0x1000,0x2000,...

I did check the operation of this feature on CycloneV (socfpga) Helio board.

v4:
  Rebase to 4.10-rc5
  The following patches have been removed from this series as similar functions
  were modified by other commit.
     - pstore: Replace four kzalloc() calls by kcalloc() in ramoops_init_przs()
     - pstore: Change parameter of ramoops_free_przs()
     - pstore: Rename 'przs' to 'dprzs' in struct ramoops_context
     - ramoops: Rename ramoops_init_prz() to ramoops_init_dprzs()

v3:
  Rebase to v4.8.
  Split patch.
  merged device_create().
  Remove Blank lines.
  Update documentiation of DT binding.
  Update parsing function of ramoops_pmsg_size, add NULL termination.
  Update module parameters for pmsg_size list.


Hiraku Toyooka (2):
  pstore: support multiple pmsg instances
  selftests/pstore: add testcases for multiple pmsg instances

Nobuhiro Iwamatsu (2):
  ramoops: Add __ramoops_init_prz() as generic function
  ramoops: support multiple pmsg instances

 Documentation/admin-guide/ramoops.rst              |  22 ++
 .../bindings/reserved-memory/ramoops.txt           |   6 +-
 fs/pstore/pmsg.c                                   |  23 +-
 fs/pstore/ram.c                                    | 286 +++++++++++++++++----
 include/linux/pstore.h                             |   1 +
 include/linux/pstore_ram.h                         |   8 +-
 tools/testing/selftests/pstore/common_tests        |  21 +-
 .../selftests/pstore/pstore_post_reboot_tests      |  27 +-
 tools/testing/selftests/pstore/pstore_tests        |  14 +-
 9 files changed, 326 insertions(+), 82 deletions(-)

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2.11.0