[v8,0/5] Extend coredump functionality

Message

Rishabh Bhatnagar July 16, 2020, 10:20 p.m. UTC

This patch series moves the coredump functionality to a separate
file and adds "inline" coredump feature. Inline coredump directly
copies segments from device memory during coredump to userspace.
This avoids extra memory usage at the cost of speed. Recovery is
stalled until all data is read by userspace.
This patchset also includes Sibi Sankar's patch to deal with chunk sizes
lesser than segment size to make inline coredump work for modem.
https://patchwork.kernel.org/patch/11637157/

Changelog:

v8 -> v7:
- Split out the qcom_q6v5_mss refactoring into a new patch
- Remove zero size check in dump_segment function for mss
- Remove segment number being passed as private member for the segment
- Free the memory used by dump state header before signalling completion

v7 -> v6:
- Include Sibi's patch as part of this patchset
- Add a linefeed when displaying coredump conf in debugfs
- Fix a typo in remoteproc.h

v6 -> v5:
- Fix unsigned comaprison with negative bug found on gcc-9.3.0

v5 -> v4:
- Rebase on top of linux-next
- Modify qcom_q6v5_mss driver as a result of rebasing on latest tip.

v4 -> v3:
- Write a helper function to copy segment memory for every dump format
- Change segment dump fn to add offset and size adn covert mss driver

v3 -> v2:
- Move entire coredump functionality to remoteproc_coredump.c
- Modify rproc_coredump to perform dump according to conf. set by userspace
- Move the userspace configuration to debugfs from sysfs.
- Keep the default coredump implementation as is

v2 -> v1:
- Introduce new file for coredump.
- Add userspace sysfs configuration for dump type.

Rishabh Bhatnagar (4):
  remoteproc: Move coredump functionality to a new file
  remoteproc: Add size and offset arguments to segment dump function
  remoteproc: Add inline coredump functionality
  remoteproc: Add coredump debugfs entry

Sibi Sankar (1):
  remoteproc: qcom_q6v5_mss: Replace mask based tracking with size

 drivers/remoteproc/Makefile              |   1 +
 drivers/remoteproc/qcom_q6v5_mss.c       |  25 ++-
 drivers/remoteproc/remoteproc_core.c     | 191 ------------------
 drivers/remoteproc/remoteproc_coredump.c | 325 +++++++++++++++++++++++++++++++
 drivers/remoteproc/remoteproc_debugfs.c  |  90 +++++++++
 drivers/remoteproc/remoteproc_internal.h |   4 +
 include/linux/remoteproc.h               |  21 +-
 7 files changed, 451 insertions(+), 206 deletions(-)
 create mode 100644 drivers/remoteproc/remoteproc_coredump.c