linux-kernel - [PATCH v2 00/11] mm: ioremap: Convert architectures to take GENERIC

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Date:   Sat, 20 Aug 2022 08:31:14 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hch@...radead.org,
        agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
        linux-arm-kernel@...ts.infradead.org, Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 00/11] mm: ioremap:  Convert architectures to take GENERIC_IOREMAP way

Currently, many architecutres have't taken the standard GENERIC_IOREMAP
way to implement ioremap_prot(), iounmap(), and ioremap_xx(), but make
these functions specifically under each arch's folder. Those cause many
duplicated codes of ioremap() and iounmap().

In this patchset, firstly adapt the hooks io[re|un]map_allowed, then
make use of them to convert those ARCH-es to take GENERIC_IOREMAP method.
With these change, duplicated ioremap/iounmap() code uder ARCH-es are
removed.

This is suggested by Christoph in below discussion:
https://lore.kernel.org/all/Yp7h0Jv6vpgt6xdZ@infradead.org/T/#u

And it's basically further action after arm64 has converted to
GENERIC_IOREMAP way in below patchset.
[PATCH v5 0/6] arm64: Cleanup ioremap() and support ioremap_prot()
https://lore.kernel.org/all/20220607125027.44946-1-wangkefeng.wang@huawei.com/T/#u

And some change of io[re|un]map_allowed() is borrowed from the v3 of
arm64 converting patch.
[PATCH v3 4/6] mm: ioremap: Add arch_ioremap/iounmap()
https://lore.kernel.org/all/20220519082552.117736-5-wangkefeng.wang@huawei.com/T/#u

v1->v2:
  Rename io[re|un]map_allowed() to arch_io[re|un]map() and made
  some minor changes in patch 1~2 as per Alexander and Kefeng's
  suggestions. Accordingly, adjust patches~4~11 because of the renaming
  arch_io[re|un]map().

Testing:
It passes the testing on arm64. For other ARCHes, I only tried to pass
build with existing RPMs of cross compiling tools. ARCHes like openrisc,
parisc, don't build because of lack of cross compiling RPMS.

Baoquan He (11):
  mm/ioremap: change the return value of io[re|un]map_allowed and rename
  mm: ioremap: fixup the physical address and page prot
  mm: ioremap: allow ARCH to have its own ioremap definition
  arc: mm: Convert to GENERIC_IOREMAP
  hexagon: mm: Convert to GENERIC_IOREMAP
  ia64: mm: Convert to GENERIC_IOREMAP
  openrisc: mm: Convert to GENERIC_IOREMAP
  parisc: mm: Convert to GENERIC_IOREMAP
  s390: mm: Convert to GENERIC_IOREMAP
  sh: mm: Convert to GENERIC_IOREMAP
  xtensa: mm: Convert to GENERIC_IOREMAP

 arch/arc/Kconfig               |  1 +
 arch/arc/include/asm/io.h      | 19 +++++++---
 arch/arc/mm/ioremap.c          | 60 +++++--------------------------
 arch/arm64/include/asm/io.h    |  5 +--
 arch/arm64/mm/ioremap.c        | 16 ++++++---
 arch/hexagon/Kconfig           |  1 +
 arch/hexagon/include/asm/io.h  |  9 +++--
 arch/hexagon/mm/ioremap.c      | 44 -----------------------
 arch/ia64/Kconfig              |  1 +
 arch/ia64/include/asm/io.h     | 26 ++++++++------
 arch/ia64/mm/ioremap.c         | 50 ++++++--------------------
 arch/openrisc/Kconfig          |  1 +
 arch/openrisc/include/asm/io.h | 16 ++++++---
 arch/openrisc/mm/ioremap.c     | 51 +++++++++-----------------
 arch/parisc/Kconfig            |  1 +
 arch/parisc/include/asm/io.h   | 16 ++++++---
 arch/parisc/mm/ioremap.c       | 65 ++++------------------------------
 arch/s390/Kconfig              |  1 +
 arch/s390/include/asm/io.h     | 26 +++++++++-----
 arch/s390/pci/pci.c            | 60 +++++--------------------------
 arch/sh/Kconfig                |  1 +
 arch/sh/include/asm/io.h       | 47 ++++++++----------------
 arch/sh/mm/ioremap.c           | 61 ++++++-------------------------
 arch/xtensa/Kconfig            |  1 +
 arch/xtensa/include/asm/io.h   | 39 +++++++++-----------
 arch/xtensa/mm/ioremap.c       | 56 +++++++----------------------
 include/asm-generic/io.h       | 34 ++++++++++--------
 mm/ioremap.c                   | 12 ++++---
 28 files changed, 230 insertions(+), 490 deletions(-)
 delete mode 100644 arch/hexagon/mm/ioremap.c

-- 
2.34.1