linux-kernel - [PATCH v10 0/4] Replace fallback for IO memcpy and IO memset

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Message-ID: <20241021133154.516847-1-jvetter@kalrayinc.com>
Date: Mon, 21 Oct 2024 15:31:50 +0200
From: Julian Vetter <jvetter@...rayinc.com>
To: Arnd Bergmann <arnd@...db.de>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Guo Ren
 <guoren@...nel.org>, Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui
 <kernel@...0n.name>, Andrew Morton <akpm@...ux-foundation.org>, Geert
 Uytterhoeven <geert@...ux-m68k.org>, Richard Henderson
 <richard.henderson@...aro.org>, Niklas Schnelle <schnelle@...ux.ibm.com>,
 Takashi Iwai <tiwai@...e.com>, Miquel Raynal <miquel.raynal@...tlin.com>,
 David Laight <David.Laight@...lab.com>, Johannes Berg
 <johannes@...solutions.net>, Christoph Hellwig <hch@...radead.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-csky@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-arch@...r.kernel.org, Yann Sionneau <ysionneau@...rayinc.com>, Julian
 Vetter <jvetter@...rayinc.com>
Subject: [PATCH v10 0/4] Replace fallback for IO memcpy and IO memset

Thank you again for your remarks Arnd and Christoph! I have updated the
patchset, and placed the functions directly in asm-generic/io.h. I have
dropped the libs/iomem_copy.c and have updated/clarified the commit
message in the first patch.

Signed-off-by: Julian Vetter <jvetter@...rayinc.com>
---
Changes for v10:
- Removed libs/iomem_copy.c again
- Replaced the three functions in asm-generic/io.h directly
- Updated description for the first patch to clarify the matter
- Slightly updated description in patches 2 to 4

Changes for v9:
- Moved functions into a new file iomem_copy.c which is built
  unconditionally
- Guard prototypes with '#ifndef memcpy_fromio', etc.
- Dropped patches 5 to 14 for now. I will send some of the changes in
  separate patches or patchsets to the appropriate mailinglists
- Added proper reviewed-by and acked-by to arm64 and csky patches

Changes for v8:
- Dropped the arch/um patch that adds dummy implementations for IO
  memcpy functions
- Added 3 new patches that fix the dependency problem for UM (added
  dependencies on HAS_IOMEM || INDIRECT_IOMEM)
- Added new patch for s390 to internally call the zpci_memcpy functions
  and not the generic ones from libs/iomap_copy.c
- Addressed reviewer comments and replaced 2 or 3 shifts by
  'qc *= ~0UL / 0xff;'
- Addressed reviewer comments on pasrisc (masking the int value)
- Addressed reviewer comments on alpha (masking the int value)

Changes for v7:
- Added dummy implementations for memcpy_{to,from}io and memset_io on um
  architecture so drivers that use these functions build for um
- Replaced all accesses and checks by long type
- Added function prototypes as extern to asm-generic/io.h
- Removed '__' from the 3 new function names
- Some archs implement their own version of these IO functions with
  slightly different prototypes. So, I added 3 new patches to align
  prototypes with new ones in iomap_copy.c + io.h

Changes for v6:
- Added include of linux/align.h to fix build on arm arch
- Replaced compile-time check by ifdef for the CONFIG_64BIT otherwise we
  get a warning for the 'qc << 32' for archs with 32bit int types
- Suffixed arch commits by arch name

Changes for v5:
- Added functions to iomap_copy.c as proposed by Arndt
- Removed again the new io_copy.c and related objects
- Removed GENERIC_IO_COPY symbol and instead rely on the existing
  HAS_IOMEM symbol
- Added prototypes of __memcpy_{to,from}io and __memset_io functions to
  asm-generic/io.h

Changes for v4:
- Replaced memcpy/memset in asm-generic/io.h by the new
  __memcpy_{to,from}io and __memset_io, so individual architectures can
  use it instead of using their own implementation.

Changes for v3:
- Replaced again 'if(IS_ENABLED(CONFIG_64BIT))' by '#ifdef CONFIG_64BIT'
  because on 32bit architectures (e.g., csky), __raw_{read,write}q are
  not defined. So, it leads to compilation errors

Changes for v2:
- Renamed io.c -> io_copy.c
- Updated flag to 'GENERIC_IO_COPY'
- Replaced pointer dereferences by 'put_unaligned()'/'get_unaligned()'
- Replaced '#ifdef CONFIG_64BIT' by 'if(IS_ENABLED(CONFIG_64BIT))'
- Removed '__raw_{read,write}_native' and replaced by
  'if(IS_ENABLED(CONFIG_64BIT))' -> '__raw_write{l,q}'
---
Julian Vetter (4):
  Replace fallback for IO memcpy and IO memset
  arm64: Use new fallback IO memcpy/memset
  csky: Use new fallback IO memcpy/memset
  loongarch: Use new fallback IO memcpy/memset

 arch/arm64/include/asm/io.h     |  11 ---
 arch/arm64/kernel/io.c          |  87 ------------------------
 arch/csky/include/asm/io.h      |  11 ---
 arch/csky/kernel/Makefile       |   2 +-
 arch/csky/kernel/io.c           |  91 -------------------------
 arch/loongarch/include/asm/io.h |  10 ---
 arch/loongarch/kernel/Makefile  |   2 +-
 arch/loongarch/kernel/io.c      |  94 --------------------------
 include/asm-generic/io.h        | 116 ++++++++++++++++++++++++++------
 9 files changed, 98 insertions(+), 326 deletions(-)
 delete mode 100644 arch/csky/kernel/io.c
 delete mode 100644 arch/loongarch/kernel/io.c

-- 
2.34.1