[PATCH net-next v2 0/6] PLDM Firmware Update Support for pds_core

["Nikhil P. Rao" <nikhil.rao@amd.com>]

This series adds PLDM-based firmware update support to the pds_core
driver. PLDM (Platform Level Data Model) is a DMTF standard for firmware
management that provides a vendor-neutral interface for firmware updates.

The implementation uses the kernel's pldmfw library for package parsing
and component matching. Users can update entire firmware packages or
individual components via devlink flash. Component information is
displayed via devlink info, showing firmware versions and update status
for each component.

The series also adds host backed memory support, allowing firmware to
request memory pages from the host for its operations.

Changes since v1:
- Removed redefinition of __counted_by kernel primitive (Jakub Kicinski)
- Fixed kdoc warnings in pds_core_if.h
- Fixed checkpatch warnings
- Fixed bugs identified by sashiko:
  Patch 2 (identity version 2):
  - Zero data region before firmware commands
  - Suppress expected error message during identify probe

  Patch 3 (PLDM firmware update):
  - Memory leak in pdsc_send_component_image() error path
  - Memory leak in pdsc_flash_component() error path
  - Missing devcmd_lock in pdsc_devcmd_finalize_update()
  - Fixed dma_mapping_error() return value handling (returns boolean, not error code)
  - Skip logic for components with index > 255

  Patch 4 (component info):
  - Added generic fw version display for all identity versions
  - Handle components with both RUNNING and STARTUP flags

  Patch 5 (host backed memory):
  - Race between pdsc_remove and health thread (use-after-free)
  - Set missing index field in MEM_QUERY command
  - Host memory allocation size and zeroing
  - Don't free host memory on MEM_ADD timeout (firmware may still be using it)

  Patch 6 (debugfs):
  - Fix dentry reference leak in debugfs_lookup (missing dput)

- Improvements:
  - Cache component info to avoid repeated firmware queries (patch 4)

Note: The following fix for an existing bug was submitted separately
via net:
- Timeout error overwritten with stale status:
  https://lore.kernel.org/netdev/20260515212907.998028-1-nikhil.rao@amd.com/

Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com>

---
Brett Creeley (4):
      pds_core: add support for quiet devcmd failures
      pds_core: add support for identity version 2
      pds_core: add PLDM firmware update support via devlink flash
      pds_core: add PLDM component info display

Vamsi Atluri (2):
      pds_core: add host backed memory support for firmware
      pds_core: add debugfs support for host backed memory

 drivers/net/ethernet/amd/Kconfig            |   1 +
 drivers/net/ethernet/amd/pds_core/core.c    | 167 +++++++
 drivers/net/ethernet/amd/pds_core/core.h    |  33 +-
 drivers/net/ethernet/amd/pds_core/debugfs.c |  50 ++
 drivers/net/ethernet/amd/pds_core/dev.c     |  94 +++-
 drivers/net/ethernet/amd/pds_core/devlink.c |  90 +++-
 drivers/net/ethernet/amd/pds_core/fw.c      | 727 +++++++++++++++++++++++++++-
 drivers/net/ethernet/amd/pds_core/main.c    |   7 +-
 include/linux/pds/pds_adminq.h              | 132 +++++
 include/linux/pds/pds_core_if.h             | 379 +++++++++++++++
 10 files changed, 1660 insertions(+), 20 deletions(-)
---
base-commit: 543bdc1578cd380631558a884318551a0e9fdab2
change-id: 20260516-upstream_v2_clean-33fdeea55b7a

Best regards,
--  
Nikhil P. Rao <nikhil.rao@amd.com>