[v5,00/19] remoteproc: Add support for detaching a remote processor

Message

Mathieu Poirier Feb. 11, 2021, 11:46 p.m. UTC

Following the work done here [1], this set provides support for the
remoteproc core to release resources associated with a remote processor
without having to switch it off. That way a platform driver can be removed
or the application processor power cycled while the remote processor is
still operating.

Modifications for this revision are detailed in the changelog of each patch but
the main enhancement is the setup of a clean resource table when a remote
processor is detached from.

I have tested scenarios where the processor is detached and re-attached when
booted from an external entity and the remoteproc core.  I was also able
to confirm that removing the platform driver of a detached remote processor
works.  Re-attaching the remote processor after re-inserting the platorm driver
also works properly.

Applies cleanly on rproc-next (43d3f2c715ce). 

Thanks,
Mathieu

Arnaud POULIQUEN (1):
  remoteproc: stm32: Move memory parsing to rproc_ops

Mathieu Poirier (18):
  dt-bindings: remoteproc: Add bindind to support autonomous processors
  remoteproc: Re-check state in rproc_shutdown()
  remoteproc: Remove useless check in rproc_del()
  remoteproc: Rename function rproc_actuate()
  remoteproc: Add new RPROC_ATTACHED state
  remoteproc: Properly represent the attached state
  remoteproc: Add new get_loaded_rsc_table() to rproc_ops
  remoteproc: stm32: Move resource table setup to rproc_ops
  remoteproc: Add new detach() remoteproc operation
  remoteproc: Introduce function __rproc_detach()
  remoteproc: Introduce function rproc_detach()
  remoteproc: Properly deal with the resource table
  remoteproc: Add return value to function rproc_shutdown()
  remoteproc: Properly deal with a kernel panic when attached
  remoteproc: Properly deal with a stop request when attached
  remoteproc: Properly deal with a start request when attached
  remoteproc: Properly deal with detach request
  remoteproc: Refactor rproc delete and cdev release path

 .../bindings/remoteproc/remoteproc-core.yaml  |  27 ++
 drivers/remoteproc/remoteproc_cdev.c          |  32 +-
 drivers/remoteproc/remoteproc_core.c          | 307 ++++++++++++++++--
 drivers/remoteproc/remoteproc_elf_loader.c    |  24 +-
 drivers/remoteproc/remoteproc_internal.h      |  10 +
 drivers/remoteproc/remoteproc_sysfs.c         |  20 +-
 drivers/remoteproc/stm32_rproc.c              | 168 +++++-----
 include/linux/remoteproc.h                    |  27 +-
 8 files changed, 465 insertions(+), 150 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/remoteproc-core.yaml