[v4,0/6] arm64: Cleanup ioremap() and support ioremap_prot()

Message

Kefeng Wang June 6, 2022, 7:48 a.m. UTC

1. Enhance generic ioremap to make it more useful.
2. Let's arm64 use GENERIC_IOREMAP to cleanup code.
3. Support HAVE_IOREMAP_PROT on arm64, which enable generic_access_phys(),
   it is useful when debug(eg, gdb) via access_process_vm device memory
   infrastructure.

v4:
- update based on v5.19-rc1
- add generic arch_ioremap/arch_iounmap define, per Andrew Monrton
- simply return an int for arch_ioremap and rename arch_ioremap/arch_iounmap
  to a better name, ioremap_allowed/iounmap_allowed, per Arnd Bergmann
- add __force annotation to slince sparse warning in vunmap() 

Note, 
1) after the renaming, the arm's change(patch1) is not the necessary
   dependence for the following changes, but as a cleanup, still post
   it here, hope it go in via the arm64 tree with reset of the series
   directly if no object.
2) the changes in this version only influence on patch4/5, so retain
   the ack/review.

v3:
- add cleanup patch to kill ARM's unused arch_iounmap(the naming will be
  used in GENERIC_IOREMAP) and add comments for arch_ioremap/arch_iounmap
  hooks, per Anshuman Khandual
- collect ack/review 

v2:
- s/addr/phys_addr in ioremap_prot, suggested by Andrew Morton 
- rename arch_ioremap/iounmap_check to arch_ioremap/iounmap
  and change return value, per Christoph Hellwig and Andrew Morton
- and use 'ifndef arch_ioremap' instead of weak function, per Arnd Bergmann
- collect ack/review

Kefeng Wang (6):
  ARM: mm: kill unused runtime hook arch_iounmap()
  mm: ioremap: Use more sensibly name in ioremap_prot()
  mm: ioremap: Setup phys_addr of struct vm_struct
  mm: ioremap: Add ioremap/iounmap_allowed()
  arm64: mm: Convert to GENERIC_IOREMAP
  arm64: Add HAVE_IOREMAP_PROT support

 .../features/vm/ioremap_prot/arch-support.txt |  2 +-
 arch/arm/include/asm/io.h                     |  4 +-
 arch/arm/mm/ioremap.c                         |  9 +-
 arch/arm/mm/nommu.c                           |  9 +-
 arch/arm64/Kconfig                            |  2 +
 arch/arm64/include/asm/io.h                   | 20 +++--
 arch/arm64/include/asm/pgtable.h              | 10 +++
 arch/arm64/kernel/acpi.c                      |  2 +-
 arch/arm64/mm/hugetlbpage.c                   | 10 ---
 arch/arm64/mm/ioremap.c                       | 84 +++----------------
 include/asm-generic/io.h                      | 27 +++++-
 mm/ioremap.c                                  | 26 ++++--
 12 files changed, 84 insertions(+), 121 deletions(-)