linux-kernel - [PATCH RFC 0/4] Introduce 128-bit IO access

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Message-ID: <20251112015846.1842207-1-huangchenghai2@huawei.com>
Date: Wed, 12 Nov 2025 09:58:42 +0800
From: Chenghai Huang <huangchenghai2@...wei.com>
To: <arnd@...db.de>, <catalin.marinas@....com>, <will@...nel.org>,
	<akpm@...ux-foundation.org>, <anshuman.khandual@....com>,
	<ryan.roberts@....com>, <andriy.shevchenko@...ux.intel.com>,
	<herbert@...dor.apana.org.au>, <linux-kernel@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-crypto@...r.kernel.org>, <linux-api@...r.kernel.org>
CC: <fanghao11@...wei.com>, <shenyang39@...wei.com>, <liulongfang@...wei.com>,
	<qianweili@...wei.com>
Subject: [PATCH RFC 0/4] Introduce 128-bit IO access

These patches introduce 128-bit IO access functionality. The reason
is that the current HiSilicon cryptographic devices need to
maintain atomic operations when accessing 128-bit MMIO across
physical and virtual functions.

Currently, 128-bit atomic writes have already been implemented in
the device driver, and the driver also depends on a 128-bit atomic
read access interface. Therefore, we have introduced a generic
128-bit IO access interface to replace the implementation of
128-bit read and write IO interfaces using instructions in the
device driver. When the architecture does not support 128-bit
atomic operations, non-atomic 128-bit read and write interfaces can
be used to make the driver functional.

Weili Qian (4):
  UAPI: Introduce 128-bit types and byteswap operations
  asm-generic/io.h: add io{read,write}128 accessors
  io-128-nonatomic: introduce io{read|write}128_{lo_hi|hi_lo}
  arm64/io: Add {__raw_read|__raw_write}128 support

 arch/arm64/include/asm/io.h                  | 21 +++++++++
 include/asm-generic/io.h                     | 48 ++++++++++++++++++++
 include/linux/io-128-nonatomic-hi-lo.h       | 35 ++++++++++++++
 include/linux/io-128-nonatomic-lo-hi.h       | 34 ++++++++++++++
 include/uapi/linux/byteorder/big_endian.h    |  6 +++
 include/uapi/linux/byteorder/little_endian.h |  6 +++
 include/uapi/linux/swab.h                    | 10 ++++
 include/uapi/linux/types.h                   |  3 ++
 8 files changed, 163 insertions(+)
 create mode 100644 include/linux/io-128-nonatomic-hi-lo.h
 create mode 100644 include/linux/io-128-nonatomic-lo-hi.h

-- 
2.33.0