[PATCH v3 0/7] Refactor reserved memory regions handling code

[Marek Szyprowski]

Hello,

The reserved memory regions handling code was reworked to handle
unlimited so called "static" memory nodes in commit 00c9a452a235 ("of:
reserved_mem: Add code to dynamically allocate reserved_mem array").

The side effect of this rework was a set of bugs fixed later by commits
0fd17e598333 ("of: reserved_mem: Allow reserved_mem framework detect
"cma=" kernel param") and 2c223f7239f3 ("of: reserved_mem: Restructure
call site for dma_contiguous_early_fixup()"). As a result, the code in
drivers/of/of_reserved_mem.c became a mix of generic code and CMA
specific fixups.

In this patchset I try to untangle this spaghetti and perform some code
cleanup. I hope nothing breaks this time.

Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland


Changelog:

v3:
- fixed more issues pointed by Sashiko in
  https://sashiko.dev/#/patchset/20260323100901.4079171-1-m.szyprowski@xxxxxxxxxxx
  (restored use of _OF_DECLARE macro, extended some comments and commit
  descriptions, the remaining items I consider not relevant)

v2: https://lore.kernel.org/all/20260323100901.4079171-1-m.szyprowski@xxxxxxxxxxx/
- added missing ops assignment removal in tegra210-emc-table and swiotlb
  drivers
- fixed issues pointed by kernel test robot and Sashiko: removed typos,
  improved comments
- fixed incorrect node passed to fdt_validate_reserved_mem_node() in
  fdt_scan_reserved_mem_reg_nodes()

v1: https://lore.kernel.org/all/20260313150802.1121442-1-m.szyprowski@xxxxxxxxxxx/
- initial version


Patch summary:

Marek Szyprowski (7):
  of: reserved_mem: remove fdt node from the structure
  of: reserved_mem: use -ENODEV instead of -ENOENT
  of: reserved_mem: switch to ops based OF_DECLARE()
  of: reserved_mem: replace CMA quirks by generic methods
  of: reserved_mem: rearrange code a bit
  of: reserved_mem: clarify fdt_scan_reserved_mem*() functions
  of: reserved_mem: rework fdt_init_reserved_mem_node()

 drivers/memory/tegra/tegra210-emc-table.c |  19 +-
 drivers/of/fdt.c                          |   2 +-
 drivers/of/of_private.h                   |   2 +-
 drivers/of/of_reserved_mem.c              | 320 +++++++++++++---------
 include/linux/cma.h                       |  10 -
 include/linux/dma-map-ops.h               |   3 -
 include/linux/of_reserved_mem.h           |  16 +-
 kernel/dma/coherent.c                     |  19 +-
 kernel/dma/contiguous.c                   |  86 ++++--
 kernel/dma/swiotlb.c                      |  19 +-
 10 files changed, 285 insertions(+), 211 deletions(-)

-- 
2.34.1