[v3,0/6] arm64: Cleanup ioremap() and support ioremap_prot()

Message

Kefeng Wang May 19, 2022, 8:25 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.

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/iounmad
  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 arch_ioremap/iounmap()
  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                       | 85 +++----------------
 include/asm-generic/io.h                      | 26 +++++-
 mm/ioremap.c                                  | 30 +++++--
 12 files changed, 88 insertions(+), 121 deletions(-)